source3/smbd/process.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    process incoming packets - main loop
   4    Copyright (C) Andrew Tridgell 1992-1998
   5    Copyright (C) Volker Lendecke 2005-2007
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19 */
  20
  21 #include "includes.h"
  22 #include "../lib/tsocket/tsocket.h"
  23 #include "system/filesys.h"
  24 #include "smbd/smbd.h"
  25 #include "smbd/globals.h"
  26 #include "librpc/gen_ndr/netlogon.h"
  27 #include "../lib/async_req/async_sock.h"
  28 #include "ctdbd_conn.h"
  29 #include "../lib/util/select.h"
  30 #include "printing/queue_process.h"
  31 #include "system/select.h"
  32 #include "passdb.h"
  33 #include "auth.h"
  34 #include "messages.h"
  35 #include "smbprofile.h"
  36 #include "rpc_server/spoolss/srv_spoolss_nt.h"
  37 #include "libsmb/libsmb.h"
  38 #include "../lib/util/tevent_ntstatus.h"
  39
  40 extern bool global_machine_password_needs_changing;
  41
  42 static void construct_reply_common(struct smb_request *req, const char *inbuf,
  43                                    char *outbuf);
  44 static struct pending_message_list *get_deferred_open_message_smb(
  45         struct smbd_server_connection *sconn, uint64_t mid);
  46
  47 static bool smbd_lock_socket_internal(struct smbd_server_connection *sconn)
  48 {
  49         bool ok;
  50
  51         if (sconn->smb1.echo_handler.socket_lock_fd == -1) {
  52                 return true;
  53         }
  54
  55         sconn->smb1.echo_handler.ref_count++;
  56
  57         if (sconn->smb1.echo_handler.ref_count > 1) {
  58                 return true;
  59         }
  60
  61         DEBUG(10,("pid[%d] wait for socket lock\n", (int)sys_getpid()));
  62
  63         do {
  64                 ok = fcntl_lock(
  65                         sconn->smb1.echo_handler.socket_lock_fd,
  66                         SMB_F_SETLKW, 0, 0, F_WRLCK);
  67         } while (!ok && (errno == EINTR));
  68
  69         if (!ok) {
  70                 DEBUG(1, ("fcntl_lock failed: %s\n", strerror(errno)));
  71                 return false;
  72         }
  73
  74         DEBUG(10,("pid[%d] got for socket lock\n", (int)sys_getpid()));
  75
  76         return true;
  77 }
  78
  79 void smbd_lock_socket(struct smbd_server_connection *sconn)
  80 {
  81         if (!smbd_lock_socket_internal(sconn)) {
  82                 exit_server_cleanly("failed to lock socket");
  83         }
  84 }
  85
  86 static bool smbd_unlock_socket_internal(struct smbd_server_connection *sconn)
  87 {
  88         bool ok;
  89
  90         if (sconn->smb1.echo_handler.socket_lock_fd == -1) {
  91                 return true;
  92         }
  93
  94         sconn->smb1.echo_handler.ref_count--;
  95
  96         if (sconn->smb1.echo_handler.ref_count > 0) {
  97                 return true;
  98         }
  99
 100         do {
 101                 ok = fcntl_lock(
 102                         sconn->smb1.echo_handler.socket_lock_fd,
 103                         SMB_F_SETLKW, 0, 0, F_UNLCK);
 104         } while (!ok && (errno == EINTR));
 105
 106         if (!ok) {
 107                 DEBUG(1, ("fcntl_lock failed: %s\n", strerror(errno)));
 108                 return false;
 109         }
 110
 111         DEBUG(10,("pid[%d] unlocked socket\n", (int)sys_getpid()));
 112
 113         return true;
 114 }
 115
 116 void smbd_unlock_socket(struct smbd_server_connection *sconn)
 117 {
 118         if (!smbd_unlock_socket_internal(sconn)) {
 119                 exit_server_cleanly("failed to unlock socket");
 120         }
 121 }
 122
 123 /* Accessor function for smb_read_error for smbd functions. */
 124
 125 /****************************************************************************
 126  Send an smb to a fd.
 127 ****************************************************************************/
 128
 129 bool srv_send_smb(struct smbd_server_connection *sconn, char *buffer,
 130                   bool do_signing, uint32_t seqnum,
 131                   bool do_encrypt,
 132                   struct smb_perfcount_data *pcd)
 133 {
 134         size_t len = 0;
 135         size_t nwritten=0;
 136         ssize_t ret;
 137         char *buf_out = buffer;
 138
 139         smbd_lock_socket(sconn);
 140
 141         if (do_signing) {
 142                 /* Sign the outgoing packet if required. */
 143                 srv_calculate_sign_mac(sconn, buf_out, seqnum);
 144         }
 145
 146         if (do_encrypt) {
 147                 NTSTATUS status = srv_encrypt_buffer(buffer, &buf_out);
 148                 if (!NT_STATUS_IS_OK(status)) {
 149                         DEBUG(0, ("send_smb: SMB encryption failed "
 150                                 "on outgoing packet! Error %s\n",
 151                                 nt_errstr(status) ));
 152                         goto out;
 153                 }
 154         }
 155
 156         len = smb_len(buf_out) + 4;
 157
 158         ret = write_data(sconn->sock, buf_out+nwritten, len - nwritten);
 159         if (ret <= 0) {
 160
 161                 char addr[INET6_ADDRSTRLEN];
 162                 /*
 163                  * Try and give an error message saying what
 164                  * client failed.
 165                  */
 166                 DEBUG(1,("pid[%d] Error writing %d bytes to client %s. %d. (%s)\n",
 167                          (int)sys_getpid(), (int)len,
 168                          get_peer_addr(sconn->sock, addr, sizeof(addr)),
 169                          (int)ret, strerror(errno) ));
 170
 171                 srv_free_enc_buffer(buf_out);
 172                 goto out;
 173         }
 174
 175         SMB_PERFCOUNT_SET_MSGLEN_OUT(pcd, len);
 176         srv_free_enc_buffer(buf_out);
 177 out:
 178         SMB_PERFCOUNT_END(pcd);
 179
 180         smbd_unlock_socket(sconn);
 181         return true;
 182 }
 183
 184 /*******************************************************************
 185  Setup the word count and byte count for a smb message.
 186 ********************************************************************/
 187
 188 int srv_set_message(char *buf,
 189                         int num_words,
 190                         int num_bytes,
 191                         bool zero)
 192 {
 193         if (zero && (num_words || num_bytes)) {
 194                 memset(buf + smb_size,'\0',num_words*2 + num_bytes);
 195         }
 196         SCVAL(buf,smb_wct,num_words);
 197         SSVAL(buf,smb_vwv + num_words*SIZEOFWORD,num_bytes);
 198         smb_setlen(buf,(smb_size + num_words*2 + num_bytes - 4));
 199         return (smb_size + num_words*2 + num_bytes);
 200 }
 201
 202 static bool valid_smb_header(const uint8_t *inbuf)
 203 {
 204         if (is_encrypted_packet(inbuf)) {
 205                 return true;
 206         }
 207         /*
 208          * This used to be (strncmp(smb_base(inbuf),"\377SMB",4) == 0)
 209          * but it just looks weird to call strncmp for this one.
 210          */
 211         return (IVAL(smb_base(inbuf), 0) == 0x424D53FF);
 212 }
 213
 214 /* Socket functions for smbd packet processing. */
 215
 216 static bool valid_packet_size(size_t len)
 217 {
 218         /*
 219          * A WRITEX with CAP_LARGE_WRITEX can be 64k worth of data plus 65 bytes
 220          * of header. Don't print the error if this fits.... JRA.
 221          */
 222
 223         if (len > (BUFFER_SIZE + LARGE_WRITEX_HDR_SIZE)) {
 224                 DEBUG(0,("Invalid packet length! (%lu bytes).\n",
 225                                         (unsigned long)len));
 226                 return false;
 227         }
 228         return true;
 229 }
 230
 231 static NTSTATUS read_packet_remainder(int fd, char *buffer,
 232                                       unsigned int timeout, ssize_t len)
 233 {
 234         NTSTATUS status;
 235
 236         if (len <= 0) {
 237                 return NT_STATUS_OK;
 238         }
 239
 240         status = read_fd_with_timeout(fd, buffer, len, len, timeout, NULL);
 241         if (!NT_STATUS_IS_OK(status)) {
 242                 char addr[INET6_ADDRSTRLEN];
 243                 DEBUG(0, ("read_fd_with_timeout failed for client %s read "
 244                           "error = %s.\n",
 245                           get_peer_addr(fd, addr, sizeof(addr)),
 246                           nt_errstr(status)));
 247         }
 248         return status;
 249 }
 250
 251 /****************************************************************************
 252  Attempt a zerocopy writeX read. We know here that len > smb_size-4
 253 ****************************************************************************/
 254
 255 /*
 256  * Unfortunately, earlier versions of smbclient/libsmbclient
 257  * don't send this "standard" writeX header. I've fixed this
 258  * for 3.2 but we'll use the old method with earlier versions.
 259  * Windows and CIFSFS at least use this standard size. Not
 260  * sure about MacOSX.
 261  */
 262
 263 #define STANDARD_WRITE_AND_X_HEADER_SIZE (smb_size - 4 + /* basic header */ \
 264                                 (2*14) + /* word count (including bcc) */ \
 265                                 1 /* pad byte */)
 266
 267 static NTSTATUS receive_smb_raw_talloc_partial_read(TALLOC_CTX *mem_ctx,
 268                                                     const char lenbuf[4],
 269                                                     struct smbd_server_connection *sconn,
 270                                                     int sock,
 271                                                     char **buffer,
 272                                                     unsigned int timeout,
 273                                                     size_t *p_unread,
 274                                                     size_t *len_ret)
 275 {
 276         /* Size of a WRITEX call (+4 byte len). */
 277         char writeX_header[4 + STANDARD_WRITE_AND_X_HEADER_SIZE];
 278         ssize_t len = smb_len_large(lenbuf); /* Could be a UNIX large writeX. */
 279         ssize_t toread;
 280         NTSTATUS status;
 281
 282         memcpy(writeX_header, lenbuf, 4);
 283
 284         status = read_fd_with_timeout(
 285                 sock, writeX_header + 4,
 286                 STANDARD_WRITE_AND_X_HEADER_SIZE,
 287                 STANDARD_WRITE_AND_X_HEADER_SIZE,
 288                 timeout, NULL);
 289
 290         if (!NT_STATUS_IS_OK(status)) {
 291                 DEBUG(0, ("read_fd_with_timeout failed for client %s read "
 292                           "error = %s.\n",
 293                           tsocket_address_string(sconn->remote_address,
 294                                                  talloc_tos()),
 295                           nt_errstr(status)));
 296                 return status;
 297         }
 298
 299         /*
 300          * Ok - now try and see if this is a possible
 301          * valid writeX call.
 302          */
 303
 304         if (is_valid_writeX_buffer(sconn, (uint8_t *)writeX_header)) {
 305                 /*
 306                  * If the data offset is beyond what
 307                  * we've read, drain the extra bytes.
 308                  */
 309                 uint16_t doff = SVAL(writeX_header,smb_vwv11);
 310                 ssize_t newlen;
 311
 312                 if (doff > STANDARD_WRITE_AND_X_HEADER_SIZE) {
 313                         size_t drain = doff - STANDARD_WRITE_AND_X_HEADER_SIZE;
 314                         if (drain_socket(sock, drain) != drain) {
 315                                 smb_panic("receive_smb_raw_talloc_partial_read:"
 316                                         " failed to drain pending bytes");
 317                         }
 318                 } else {
 319                         doff = STANDARD_WRITE_AND_X_HEADER_SIZE;
 320                 }
 321
 322                 /* Spoof down the length and null out the bcc. */
 323                 set_message_bcc(writeX_header, 0);
 324                 newlen = smb_len(writeX_header);
 325
 326                 /* Copy the header we've written. */
 327
 328                 *buffer = (char *)talloc_memdup(mem_ctx,
 329                                 writeX_header,
 330                                 sizeof(writeX_header));
 331
 332                 if (*buffer == NULL) {
 333                         DEBUG(0, ("Could not allocate inbuf of length %d\n",
 334                                   (int)sizeof(writeX_header)));
 335                         return NT_STATUS_NO_MEMORY;
 336                 }
 337
 338                 /* Work out the remaining bytes. */
 339                 *p_unread = len - STANDARD_WRITE_AND_X_HEADER_SIZE;
 340                 *len_ret = newlen + 4;
 341                 return NT_STATUS_OK;
 342         }
 343
 344         if (!valid_packet_size(len)) {
 345                 return NT_STATUS_INVALID_PARAMETER;
 346         }
 347
 348         /*
 349          * Not a valid writeX call. Just do the standard
 350          * talloc and return.
 351          */
 352
 353         *buffer = talloc_array(mem_ctx, char, len+4);
 354
 355         if (*buffer == NULL) {
 356                 DEBUG(0, ("Could not allocate inbuf of length %d\n",
 357                           (int)len+4));
 358                 return NT_STATUS_NO_MEMORY;
 359         }
 360
 361         /* Copy in what we already read. */
 362         memcpy(*buffer,
 363                 writeX_header,
 364                 4 + STANDARD_WRITE_AND_X_HEADER_SIZE);
 365         toread = len - STANDARD_WRITE_AND_X_HEADER_SIZE;
 366
 367         if(toread > 0) {
 368                 status = read_packet_remainder(
 369                         sock,
 370                         (*buffer) + 4 + STANDARD_WRITE_AND_X_HEADER_SIZE,
 371                         timeout, toread);
 372
 373                 if (!NT_STATUS_IS_OK(status)) {
 374                         DEBUG(10, ("receive_smb_raw_talloc_partial_read: %s\n",
 375                                    nt_errstr(status)));
 376                         return status;
 377                 }
 378         }
 379
 380         *len_ret = len + 4;
 381         return NT_STATUS_OK;
 382 }
 383
 384 static NTSTATUS receive_smb_raw_talloc(TALLOC_CTX *mem_ctx,
 385                                        struct smbd_server_connection *sconn,
 386                                        int sock,
 387                                        char **buffer, unsigned int timeout,
 388                                        size_t *p_unread, size_t *plen)
 389 {
 390         char lenbuf[4];
 391         size_t len;
 392         int min_recv_size = lp_min_receive_file_size();
 393         NTSTATUS status;
 394
 395         *p_unread = 0;
 396
 397         status = read_smb_length_return_keepalive(sock, lenbuf, timeout,
 398                                                   &len);
 399         if (!NT_STATUS_IS_OK(status)) {
 400                 return status;
 401         }
 402
 403         if (CVAL(lenbuf,0) == 0 && min_recv_size &&
 404             (smb_len_large(lenbuf) > /* Could be a UNIX large writeX. */
 405                 (min_recv_size + STANDARD_WRITE_AND_X_HEADER_SIZE)) &&
 406             !srv_is_signing_active(sconn) &&
 407             sconn->smb1.echo_handler.trusted_fde == NULL) {
 408
 409                 return receive_smb_raw_talloc_partial_read(
 410                         mem_ctx, lenbuf, sconn, sock, buffer, timeout,
 411                         p_unread, plen);
 412         }
 413
 414         if (!valid_packet_size(len)) {
 415                 return NT_STATUS_INVALID_PARAMETER;
 416         }
 417
 418         /*
 419          * The +4 here can't wrap, we've checked the length above already.
 420          */
 421
 422         *buffer = talloc_array(mem_ctx, char, len+4);
 423
 424         if (*buffer == NULL) {
 425                 DEBUG(0, ("Could not allocate inbuf of length %d\n",
 426                           (int)len+4));
 427                 return NT_STATUS_NO_MEMORY;
 428         }
 429
 430         memcpy(*buffer, lenbuf, sizeof(lenbuf));
 431
 432         status = read_packet_remainder(sock, (*buffer)+4, timeout, len);
 433         if (!NT_STATUS_IS_OK(status)) {
 434                 return status;
 435         }
 436
 437         *plen = len + 4;
 438         return NT_STATUS_OK;
 439 }
 440
 441 static NTSTATUS receive_smb_talloc(TALLOC_CTX *mem_ctx,
 442                                    struct smbd_server_connection *sconn,
 443                                    int sock,
 444                                    char **buffer, unsigned int timeout,
 445                                    size_t *p_unread, bool *p_encrypted,
 446                                    size_t *p_len,
 447                                    uint32_t *seqnum,
 448                                    bool trusted_channel)
 449 {
 450         size_t len = 0;
 451         NTSTATUS status;
 452
 453         *p_encrypted = false;
 454
 455         status = receive_smb_raw_talloc(mem_ctx, sconn, sock, buffer, timeout,
 456                                         p_unread, &len);
 457         if (!NT_STATUS_IS_OK(status)) {
 458                 DEBUG(1, ("read_smb_length_return_keepalive failed for "
 459                           "client %s read error = %s.\n",
 460                           tsocket_address_string(sconn->remote_address,
 461                                                  talloc_tos()),
 462                           nt_errstr(status)));
 463                 return status;
 464         }
 465
 466         if (is_encrypted_packet((uint8_t *)*buffer)) {
 467                 status = srv_decrypt_buffer(*buffer);
 468                 if (!NT_STATUS_IS_OK(status)) {
 469                         DEBUG(0, ("receive_smb_talloc: SMB decryption failed on "
 470                                 "incoming packet! Error %s\n",
 471                                 nt_errstr(status) ));
 472                         return status;
 473                 }
 474                 *p_encrypted = true;
 475         }
 476
 477         /* Check the incoming SMB signature. */
 478         if (!srv_check_sign_mac(sconn, *buffer, seqnum, trusted_channel)) {
 479                 DEBUG(0, ("receive_smb: SMB Signature verification failed on "
 480                           "incoming packet!\n"));
 481                 return NT_STATUS_INVALID_NETWORK_RESPONSE;
 482         }
 483
 484         *p_len = len;
 485         return NT_STATUS_OK;
 486 }
 487
 488 /*
 489  * Initialize a struct smb_request from an inbuf
 490  */
 491
 492 static bool init_smb_request(struct smb_request *req,
 493                              struct smbd_server_connection *sconn,
 494                              const uint8 *inbuf,
 495                              size_t unread_bytes, bool encrypted,
 496                              uint32_t seqnum)
 497 {
 498         size_t req_size = smb_len(inbuf) + 4;
 499         /* Ensure we have at least smb_size bytes. */
 500         if (req_size < smb_size) {
 501                 DEBUG(0,("init_smb_request: invalid request size %u\n",
 502                         (unsigned int)req_size ));
 503                 return false;
 504         }
 505         req->cmd    = CVAL(inbuf, smb_com);
 506         req->flags2 = SVAL(inbuf, smb_flg2);
 507         req->smbpid = SVAL(inbuf, smb_pid);
 508         req->mid    = (uint64_t)SVAL(inbuf, smb_mid);
 509         req->seqnum = seqnum;
 510         req->vuid   = SVAL(inbuf, smb_uid);
 511         req->tid    = SVAL(inbuf, smb_tid);
 512         req->wct    = CVAL(inbuf, smb_wct);
 513         req->vwv    = discard_const_p(uint16_t, (inbuf+smb_vwv));
 514         req->buflen = smb_buflen(inbuf);
 515         req->buf    = (const uint8_t *)smb_buf_const(inbuf);
 516         req->unread_bytes = unread_bytes;
 517         req->encrypted = encrypted;
 518         req->sconn = sconn;
 519         req->conn = conn_find(sconn,req->tid);
 520         req->chain_fsp = NULL;
 521         req->chain_outbuf = NULL;
 522         req->done = false;
 523         req->smb2req = NULL;
 524         smb_init_perfcount_data(&req->pcd);
 525
 526         /* Ensure we have at least wct words and 2 bytes of bcc. */
 527         if (smb_size + req->wct*2 > req_size) {
 528                 DEBUG(0,("init_smb_request: invalid wct number %u (size %u)\n",
 529                         (unsigned int)req->wct,
 530                         (unsigned int)req_size));
 531                 return false;
 532         }
 533         /* Ensure bcc is correct. */
 534         if (((const uint8_t *)smb_buf_const(inbuf)) + req->buflen > inbuf + req_size) {
 535                 DEBUG(0,("init_smb_request: invalid bcc number %u "
 536                         "(wct = %u, size %u)\n",
 537                         (unsigned int)req->buflen,
 538                         (unsigned int)req->wct,
 539                         (unsigned int)req_size));
 540                 return false;
 541         }
 542
 543         req->outbuf = NULL;
 544         return true;
 545 }
 546
 547 static void process_smb(struct smbd_server_connection *conn,
 548                         uint8_t *inbuf, size_t nread, size_t unread_bytes,
 549                         uint32_t seqnum, bool encrypted,
 550                         struct smb_perfcount_data *deferred_pcd);
 551
 552 static void smbd_deferred_open_timer(struct event_context *ev,
 553                                      struct timed_event *te,
 554                                      struct timeval _tval,
 555                                      void *private_data)
 556 {
 557         struct pending_message_list *msg = talloc_get_type(private_data,
 558                                            struct pending_message_list);
 559         TALLOC_CTX *mem_ctx = talloc_tos();
 560         uint64_t mid = (uint64_t)SVAL(msg->buf.data,smb_mid);
 561         uint8_t *inbuf;
 562
 563         inbuf = (uint8_t *)talloc_memdup(mem_ctx, msg->buf.data,
 564                                          msg->buf.length);
 565         if (inbuf == NULL) {
 566                 exit_server("smbd_deferred_open_timer: talloc failed\n");
 567                 return;
 568         }
 569
 570         /* We leave this message on the queue so the open code can
 571            know this is a retry. */
 572         DEBUG(5,("smbd_deferred_open_timer: trigger mid %llu.\n",
 573                 (unsigned long long)mid ));
 574
 575         /* Mark the message as processed so this is not
 576          * re-processed in error. */
 577         msg->processed = true;
 578
 579         process_smb(smbd_server_conn, inbuf,
 580                     msg->buf.length, 0,
 581                     msg->seqnum, msg->encrypted, &msg->pcd);
 582
 583         /* If it's still there and was processed, remove it. */
 584         msg = get_deferred_open_message_smb(smbd_server_conn, mid);
 585         if (msg && msg->processed) {
 586                 remove_deferred_open_message_smb(smbd_server_conn, mid);
 587         }
 588 }
 589
 590 /****************************************************************************
 591  Function to push a message onto the tail of a linked list of smb messages ready
 592  for processing.
 593 ****************************************************************************/
 594
 595 static bool push_queued_message(struct smb_request *req,
 596                                 struct timeval request_time,
 597                                 struct timeval end_time,
 598                                 char *private_data, size_t private_len)
 599 {
 600         int msg_len = smb_len(req->inbuf) + 4;
 601         struct pending_message_list *msg;
 602
 603         msg = talloc_zero(NULL, struct pending_message_list);
 604
 605         if(msg == NULL) {
 606                 DEBUG(0,("push_message: malloc fail (1)\n"));
 607                 return False;
 608         }
 609
 610         msg->buf = data_blob_talloc(msg, req->inbuf, msg_len);
 611         if(msg->buf.data == NULL) {
 612                 DEBUG(0,("push_message: malloc fail (2)\n"));
 613                 TALLOC_FREE(msg);
 614                 return False;
 615         }
 616
 617         msg->request_time = request_time;
 618         msg->seqnum = req->seqnum;
 619         msg->encrypted = req->encrypted;
 620         msg->processed = false;
 621         SMB_PERFCOUNT_DEFER_OP(&req->pcd, &msg->pcd);
 622
 623         if (private_data) {
 624                 msg->private_data = data_blob_talloc(msg, private_data,
 625                                                      private_len);
 626                 if (msg->private_data.data == NULL) {
 627                         DEBUG(0,("push_message: malloc fail (3)\n"));
 628                         TALLOC_FREE(msg);
 629                         return False;
 630                 }
 631         }
 632
 633         msg->te = event_add_timed(server_event_context(),
 634                                   msg,
 635                                   end_time,
 636                                   smbd_deferred_open_timer,
 637                                   msg);
 638         if (!msg->te) {
 639                 DEBUG(0,("push_message: event_add_timed failed\n"));
 640                 TALLOC_FREE(msg);
 641                 return false;
 642         }
 643
 644         DLIST_ADD_END(req->sconn->deferred_open_queue, msg,
 645                       struct pending_message_list *);
 646
 647         DEBUG(10,("push_message: pushed message length %u on "
 648                   "deferred_open_queue\n", (unsigned int)msg_len));
 649
 650         return True;
 651 }
 652
 653 /****************************************************************************
 654  Function to delete a sharing violation open message by mid.
 655 ****************************************************************************/
 656
 657 void remove_deferred_open_message_smb(struct smbd_server_connection *sconn,
 658                                       uint64_t mid)
 659 {
 660         struct pending_message_list *pml;
 661
 662         if (sconn->using_smb2) {
 663                 remove_deferred_open_message_smb2(sconn, mid);
 664                 return;
 665         }
 666
 667         for (pml = sconn->deferred_open_queue; pml; pml = pml->next) {
 668                 if (mid == (uint64_t)SVAL(pml->buf.data,smb_mid)) {
 669                         DEBUG(10,("remove_deferred_open_message_smb: "
 670                                   "deleting mid %llu len %u\n",
 671                                   (unsigned long long)mid,
 672                                   (unsigned int)pml->buf.length ));
 673                         DLIST_REMOVE(sconn->deferred_open_queue, pml);
 674                         TALLOC_FREE(pml);
 675                         return;
 676                 }
 677         }
 678 }
 679
 680 /****************************************************************************
 681  Move a sharing violation open retry message to the front of the list and
 682  schedule it for immediate processing.
 683 ****************************************************************************/
 684
 685 void schedule_deferred_open_message_smb(struct smbd_server_connection *sconn,
 686                                         uint64_t mid)
 687 {
 688         struct pending_message_list *pml;
 689         int i = 0;
 690
 691         if (sconn->using_smb2) {
 692                 schedule_deferred_open_message_smb2(sconn, mid);
 693                 return;
 694         }
 695
 696         for (pml = sconn->deferred_open_queue; pml; pml = pml->next) {
 697                 uint64_t msg_mid = (uint64_t)SVAL(pml->buf.data,smb_mid);
 698
 699                 DEBUG(10,("schedule_deferred_open_message_smb: [%d] "
 700                         "msg_mid = %llu\n",
 701                         i++,
 702                         (unsigned long long)msg_mid ));
 703
 704                 if (mid == msg_mid) {
 705                         struct timed_event *te;
 706
 707                         if (pml->processed) {
 708                                 /* A processed message should not be
 709                                  * rescheduled. */
 710                                 DEBUG(0,("schedule_deferred_open_message_smb: LOGIC ERROR "
 711                                         "message mid %llu was already processed\n",
 712                                         (unsigned long long)msg_mid ));
 713                                 continue;
 714                         }
 715
 716                         DEBUG(10,("schedule_deferred_open_message_smb: "
 717                                 "scheduling mid %llu\n",
 718                                 (unsigned long long)mid ));
 719
 720                         te = event_add_timed(server_event_context(),
 721                                              pml,
 722                                              timeval_zero(),
 723                                              smbd_deferred_open_timer,
 724                                              pml);
 725                         if (!te) {
 726                                 DEBUG(10,("schedule_deferred_open_message_smb: "
 727                                         "event_add_timed() failed, "
 728                                         "skipping mid %llu\n",
 729                                         (unsigned long long)msg_mid ));
 730                         }
 731
 732                         TALLOC_FREE(pml->te);
 733                         pml->te = te;
 734                         DLIST_PROMOTE(sconn->deferred_open_queue, pml);
 735                         return;
 736                 }
 737         }
 738
 739         DEBUG(10,("schedule_deferred_open_message_smb: failed to "
 740                 "find message mid %llu\n",
 741                 (unsigned long long)mid ));
 742 }
 743
 744 /****************************************************************************
 745  Return true if this mid is on the deferred queue and was not yet processed.
 746 ****************************************************************************/
 747
 748 bool open_was_deferred(struct smbd_server_connection *sconn, uint64_t mid)
 749 {
 750         struct pending_message_list *pml;
 751
 752         if (sconn->using_smb2) {
 753                 return open_was_deferred_smb2(sconn, mid);
 754         }
 755
 756         for (pml = sconn->deferred_open_queue; pml; pml = pml->next) {
 757                 if (((uint64_t)SVAL(pml->buf.data,smb_mid)) == mid && !pml->processed) {
 758                         return True;
 759                 }
 760         }
 761         return False;
 762 }
 763
 764 /****************************************************************************
 765  Return the message queued by this mid.
 766 ****************************************************************************/
 767
 768 static struct pending_message_list *get_deferred_open_message_smb(
 769         struct smbd_server_connection *sconn, uint64_t mid)
 770 {
 771         struct pending_message_list *pml;
 772
 773         for (pml = sconn->deferred_open_queue; pml; pml = pml->next) {
 774                 if (((uint64_t)SVAL(pml->buf.data,smb_mid)) == mid) {
 775                         return pml;
 776                 }
 777         }
 778         return NULL;
 779 }
 780
 781 /****************************************************************************
 782  Get the state data queued by this mid.
 783 ****************************************************************************/
 784
 785 bool get_deferred_open_message_state(struct smb_request *smbreq,
 786                                 struct timeval *p_request_time,
 787                                 void **pp_state)
 788 {
 789         struct pending_message_list *pml;
 790
 791         if (smbd_server_conn->using_smb2) {
 792                 return get_deferred_open_message_state_smb2(smbreq->smb2req,
 793                                         p_request_time,
 794                                         pp_state);
 795         }
 796
 797         pml = get_deferred_open_message_smb(smbreq->sconn, smbreq->mid);
 798         if (!pml) {
 799                 return false;
 800         }
 801         if (p_request_time) {
 802                 *p_request_time = pml->request_time;
 803         }
 804         if (pp_state) {
 805                 *pp_state = (void *)pml->private_data.data;
 806         }
 807         return true;
 808 }
 809
 810 /****************************************************************************
 811  Function to push a deferred open smb message onto a linked list of local smb
 812  messages ready for processing.
 813 ****************************************************************************/
 814
 815 bool push_deferred_open_message_smb(struct smb_request *req,
 816                                struct timeval request_time,
 817                                struct timeval timeout,
 818                                struct file_id id,
 819                                char *private_data, size_t priv_len)
 820 {
 821         struct timeval end_time;
 822
 823         if (req->smb2req) {
 824                 return push_deferred_open_message_smb2(req->smb2req,
 825                                                 request_time,
 826                                                 timeout,
 827                                                 id,
 828                                                 private_data,
 829                                                 priv_len);
 830         }
 831
 832         if (req->unread_bytes) {
 833                 DEBUG(0,("push_deferred_open_message_smb: logic error ! "
 834                         "unread_bytes = %u\n",
 835                         (unsigned int)req->unread_bytes ));
 836                 smb_panic("push_deferred_open_message_smb: "
 837                         "logic error unread_bytes != 0" );
 838         }
 839
 840         end_time = timeval_sum(&request_time, &timeout);
 841
 842         DEBUG(10,("push_deferred_open_message_smb: pushing message "
 843                 "len %u mid %llu timeout time [%u.%06u]\n",
 844                 (unsigned int) smb_len(req->inbuf)+4,
 845                 (unsigned long long)req->mid,
 846                 (unsigned int)end_time.tv_sec,
 847                 (unsigned int)end_time.tv_usec));
 848
 849         return push_queued_message(req, request_time, end_time,
 850                                    private_data, priv_len);
 851 }
 852
 853 static void smbd_sig_term_handler(struct tevent_context *ev,
 854                                   struct tevent_signal *se,
 855                                   int signum,
 856                                   int count,
 857                                   void *siginfo,
 858                                   void *private_data)
 859 {
 860         exit_server_cleanly("termination signal");
 861 }
 862
 863 void smbd_setup_sig_term_handler(void)
 864 {
 865         struct tevent_signal *se;
 866
 867         se = tevent_add_signal(server_event_context(),
 868                                server_event_context(),
 869                                SIGTERM, 0,
 870                                smbd_sig_term_handler,
 871                                NULL);
 872         if (!se) {
 873                 exit_server("failed to setup SIGTERM handler");
 874         }
 875 }
 876
 877 static void smbd_sig_hup_handler(struct tevent_context *ev,
 878                                   struct tevent_signal *se,
 879                                   int signum,
 880                                   int count,
 881                                   void *siginfo,
 882                                   void *private_data)
 883 {
 884         struct messaging_context *msg_ctx = talloc_get_type_abort(
 885                 private_data, struct messaging_context);
 886         change_to_root_user();
 887         DEBUG(1,("Reloading services after SIGHUP\n"));
 888         reload_services(msg_ctx, smbd_server_conn->sock, False);
 889         if (am_parent) {
 890                 printing_subsystem_update(ev, msg_ctx);
 891         }
 892 }
 893
 894 void smbd_setup_sig_hup_handler(struct tevent_context *ev,
 895                                 struct messaging_context *msg_ctx)
 896 {
 897         struct tevent_signal *se;
 898
 899         se = tevent_add_signal(ev, ev, SIGHUP, 0, smbd_sig_hup_handler,
 900                                msg_ctx);
 901         if (!se) {
 902                 exit_server("failed to setup SIGHUP handler");
 903         }
 904 }
 905
 906 static NTSTATUS smbd_server_connection_loop_once(struct tevent_context *ev_ctx,
 907                                                  struct smbd_server_connection *conn)
 908 {
 909         int timeout;
 910         int num_pfds = 0;
 911         int ret;
 912         bool retry;
 913
 914         timeout = SMBD_SELECT_TIMEOUT * 1000;
 915
 916         /*
 917          * Are there any timed events waiting ? If so, ensure we don't
 918          * select for longer than it would take to wait for them.
 919          */
 920
 921         event_add_to_poll_args(ev_ctx, conn, &conn->pfds, &num_pfds, &timeout);
 922
 923         /* Process a signal and timed events now... */
 924         if (run_events_poll(ev_ctx, 0, NULL, 0)) {
 925                 return NT_STATUS_RETRY;
 926         }
 927
 928         {
 929                 int sav;
 930                 START_PROFILE(smbd_idle);
 931
 932                 ret = sys_poll(conn->pfds, num_pfds, timeout);
 933                 sav = errno;
 934
 935                 END_PROFILE(smbd_idle);
 936                 errno = sav;
 937         }
 938
 939         if (ret == -1) {
 940                 if (errno == EINTR) {
 941                         return NT_STATUS_RETRY;
 942                 }
 943                 return map_nt_error_from_unix(errno);
 944         }
 945
 946         retry = run_events_poll(ev_ctx, ret, conn->pfds, num_pfds);
 947         if (retry) {
 948                 return NT_STATUS_RETRY;
 949         }
 950
 951         /* Did we timeout ? */
 952         if (ret == 0) {
 953                 return NT_STATUS_RETRY;
 954         }
 955
 956         /* should not be reached */
 957         return NT_STATUS_INTERNAL_ERROR;
 958 }
 959
 960 /*
 961  * Only allow 5 outstanding trans requests. We're allocating memory, so
 962  * prevent a DoS.
 963  */
 964
 965 NTSTATUS allow_new_trans(struct trans_state *list, uint64_t mid)
 966 {
 967         int count = 0;
 968         for (; list != NULL; list = list->next) {
 969
 970                 if (list->mid == mid) {
 971                         return NT_STATUS_INVALID_PARAMETER;
 972                 }
 973
 974                 count += 1;
 975         }
 976         if (count > 5) {
 977                 return NT_STATUS_INSUFFICIENT_RESOURCES;
 978         }
 979
 980         return NT_STATUS_OK;
 981 }
 982
 983 /*
 984 These flags determine some of the permissions required to do an operation
 985
 986 Note that I don't set NEED_WRITE on some write operations because they
 987 are used by some brain-dead clients when printing, and I don't want to
 988 force write permissions on print services.
 989 */
 990 #define AS_USER (1<<0)
 991 #define NEED_WRITE (1<<1) /* Must be paired with AS_USER */
 992 #define TIME_INIT (1<<2)
 993 #define CAN_IPC (1<<3) /* Must be paired with AS_USER */
 994 #define AS_GUEST (1<<5) /* Must *NOT* be paired with AS_USER */
 995 #define DO_CHDIR (1<<6)
 996
 997 /*
 998    define a list of possible SMB messages and their corresponding
 999    functions. Any message that has a NULL function is unimplemented -
1000    please feel free to contribute implementations!
1001 */
1002 static const struct smb_message_struct {
1003         const char *name;
1004         void (*fn)(struct smb_request *req);
1005         int flags;
1006 } smb_messages[256] = {
1007
1008 /* 0x00 */ { "SMBmkdir",reply_mkdir,AS_USER | NEED_WRITE},
1009 /* 0x01 */ { "SMBrmdir",reply_rmdir,AS_USER | NEED_WRITE},
1010 /* 0x02 */ { "SMBopen",reply_open,AS_USER },
1011 /* 0x03 */ { "SMBcreate",reply_mknew,AS_USER},
1012 /* 0x04 */ { "SMBclose",reply_close,AS_USER | CAN_IPC },
1013 /* 0x05 */ { "SMBflush",reply_flush,AS_USER},
1014 /* 0x06 */ { "SMBunlink",reply_unlink,AS_USER | NEED_WRITE },
1015 /* 0x07 */ { "SMBmv",reply_mv,AS_USER | NEED_WRITE },
1016 /* 0x08 */ { "SMBgetatr",reply_getatr,AS_USER},
1017 /* 0x09 */ { "SMBsetatr",reply_setatr,AS_USER | NEED_WRITE},
1018 /* 0x0a */ { "SMBread",reply_read,AS_USER},
1019 /* 0x0b */ { "SMBwrite",reply_write,AS_USER | CAN_IPC },
1020 /* 0x0c */ { "SMBlock",reply_lock,AS_USER},
1021 /* 0x0d */ { "SMBunlock",reply_unlock,AS_USER},
1022 /* 0x0e */ { "SMBctemp",reply_ctemp,AS_USER },
1023 /* 0x0f */ { "SMBmknew",reply_mknew,AS_USER},
1024 /* 0x10 */ { "SMBcheckpath",reply_checkpath,AS_USER},
1025 /* 0x11 */ { "SMBexit",reply_exit,DO_CHDIR},
1026 /* 0x12 */ { "SMBlseek",reply_lseek,AS_USER},
1027 /* 0x13 */ { "SMBlockread",reply_lockread,AS_USER},
1028 /* 0x14 */ { "SMBwriteunlock",reply_writeunlock,AS_USER},
1029 /* 0x15 */ { NULL, NULL, 0 },
1030 /* 0x16 */ { NULL, NULL, 0 },
1031 /* 0x17 */ { NULL, NULL, 0 },
1032 /* 0x18 */ { NULL, NULL, 0 },
1033 /* 0x19 */ { NULL, NULL, 0 },
1034 /* 0x1a */ { "SMBreadbraw",reply_readbraw,AS_USER},
1035 /* 0x1b */ { "SMBreadBmpx",reply_readbmpx,AS_USER},
1036 /* 0x1c */ { "SMBreadBs",reply_readbs,AS_USER },
1037 /* 0x1d */ { "SMBwritebraw",reply_writebraw,AS_USER},
1038 /* 0x1e */ { "SMBwriteBmpx",reply_writebmpx,AS_USER},
1039 /* 0x1f */ { "SMBwriteBs",reply_writebs,AS_USER},
1040 /* 0x20 */ { "SMBwritec", NULL,0},
1041 /* 0x21 */ { NULL, NULL, 0 },
1042 /* 0x22 */ { "SMBsetattrE",reply_setattrE,AS_USER | NEED_WRITE },
1043 /* 0x23 */ { "SMBgetattrE",reply_getattrE,AS_USER },
1044 /* 0x24 */ { "SMBlockingX",reply_lockingX,AS_USER },
1045 /* 0x25 */ { "SMBtrans",reply_trans,AS_USER | CAN_IPC },
1046 /* 0x26 */ { "SMBtranss",reply_transs,AS_USER | CAN_IPC},
1047 /* 0x27 */ { "SMBioctl",reply_ioctl,0},
1048 /* 0x28 */ { "SMBioctls", NULL,AS_USER},
1049 /* 0x29 */ { "SMBcopy",reply_copy,AS_USER | NEED_WRITE },
1050 /* 0x2a */ { "SMBmove", NULL,AS_USER | NEED_WRITE },
1051 /* 0x2b */ { "SMBecho",reply_echo,0},
1052 /* 0x2c */ { "SMBwriteclose",reply_writeclose,AS_USER},
1053 /* 0x2d */ { "SMBopenX",reply_open_and_X,AS_USER | CAN_IPC },
1054 /* 0x2e */ { "SMBreadX",reply_read_and_X,AS_USER | CAN_IPC },
1055 /* 0x2f */ { "SMBwriteX",reply_write_and_X,AS_USER | CAN_IPC },
1056 /* 0x30 */ { NULL, NULL, 0 },
1057 /* 0x31 */ { NULL, NULL, 0 },
1058 /* 0x32 */ { "SMBtrans2",reply_trans2, AS_USER | CAN_IPC },
1059 /* 0x33 */ { "SMBtranss2",reply_transs2, AS_USER | CAN_IPC },
1060 /* 0x34 */ { "SMBfindclose",reply_findclose,AS_USER},
1061 /* 0x35 */ { "SMBfindnclose",reply_findnclose,AS_USER},
1062 /* 0x36 */ { NULL, NULL, 0 },
1063 /* 0x37 */ { NULL, NULL, 0 },
1064 /* 0x38 */ { NULL, NULL, 0 },
1065 /* 0x39 */ { NULL, NULL, 0 },
1066 /* 0x3a */ { NULL, NULL, 0 },
1067 /* 0x3b */ { NULL, NULL, 0 },
1068 /* 0x3c */ { NULL, NULL, 0 },
1069 /* 0x3d */ { NULL, NULL, 0 },
1070 /* 0x3e */ { NULL, NULL, 0 },
1071 /* 0x3f */ { NULL, NULL, 0 },
1072 /* 0x40 */ { NULL, NULL, 0 },
1073 /* 0x41 */ { NULL, NULL, 0 },
1074 /* 0x42 */ { NULL, NULL, 0 },
1075 /* 0x43 */ { NULL, NULL, 0 },
1076 /* 0x44 */ { NULL, NULL, 0 },
1077 /* 0x45 */ { NULL, NULL, 0 },
1078 /* 0x46 */ { NULL, NULL, 0 },
1079 /* 0x47 */ { NULL, NULL, 0 },
1080 /* 0x48 */ { NULL, NULL, 0 },
1081 /* 0x49 */ { NULL, NULL, 0 },
1082 /* 0x4a */ { NULL, NULL, 0 },
1083 /* 0x4b */ { NULL, NULL, 0 },
1084 /* 0x4c */ { NULL, NULL, 0 },
1085 /* 0x4d */ { NULL, NULL, 0 },
1086 /* 0x4e */ { NULL, NULL, 0 },
1087 /* 0x4f */ { NULL, NULL, 0 },
1088 /* 0x50 */ { NULL, NULL, 0 },
1089 /* 0x51 */ { NULL, NULL, 0 },
1090 /* 0x52 */ { NULL, NULL, 0 },
1091 /* 0x53 */ { NULL, NULL, 0 },
1092 /* 0x54 */ { NULL, NULL, 0 },
1093 /* 0x55 */ { NULL, NULL, 0 },
1094 /* 0x56 */ { NULL, NULL, 0 },
1095 /* 0x57 */ { NULL, NULL, 0 },
1096 /* 0x58 */ { NULL, NULL, 0 },
1097 /* 0x59 */ { NULL, NULL, 0 },
1098 /* 0x5a */ { NULL, NULL, 0 },
1099 /* 0x5b */ { NULL, NULL, 0 },
1100 /* 0x5c */ { NULL, NULL, 0 },
1101 /* 0x5d */ { NULL, NULL, 0 },
1102 /* 0x5e */ { NULL, NULL, 0 },
1103 /* 0x5f */ { NULL, NULL, 0 },
1104 /* 0x60 */ { NULL, NULL, 0 },
1105 /* 0x61 */ { NULL, NULL, 0 },
1106 /* 0x62 */ { NULL, NULL, 0 },
1107 /* 0x63 */ { NULL, NULL, 0 },
1108 /* 0x64 */ { NULL, NULL, 0 },
1109 /* 0x65 */ { NULL, NULL, 0 },
1110 /* 0x66 */ { NULL, NULL, 0 },
1111 /* 0x67 */ { NULL, NULL, 0 },
1112 /* 0x68 */ { NULL, NULL, 0 },
1113 /* 0x69 */ { NULL, NULL, 0 },
1114 /* 0x6a */ { NULL, NULL, 0 },
1115 /* 0x6b */ { NULL, NULL, 0 },
1116 /* 0x6c */ { NULL, NULL, 0 },
1117 /* 0x6d */ { NULL, NULL, 0 },
1118 /* 0x6e */ { NULL, NULL, 0 },
1119 /* 0x6f */ { NULL, NULL, 0 },
1120 /* 0x70 */ { "SMBtcon",reply_tcon,0},
1121 /* 0x71 */ { "SMBtdis",reply_tdis,DO_CHDIR},
1122 /* 0x72 */ { "SMBnegprot",reply_negprot,0},
1123 /* 0x73 */ { "SMBsesssetupX",reply_sesssetup_and_X,0},
1124 /* 0x74 */ { "SMBulogoffX",reply_ulogoffX, 0}, /* ulogoff doesn't give a valid TID */
1125 /* 0x75 */ { "SMBtconX",reply_tcon_and_X,0},
1126 /* 0x76 */ { NULL, NULL, 0 },
1127 /* 0x77 */ { NULL, NULL, 0 },
1128 /* 0x78 */ { NULL, NULL, 0 },
1129 /* 0x79 */ { NULL, NULL, 0 },
1130 /* 0x7a */ { NULL, NULL, 0 },
1131 /* 0x7b */ { NULL, NULL, 0 },
1132 /* 0x7c */ { NULL, NULL, 0 },
1133 /* 0x7d */ { NULL, NULL, 0 },
1134 /* 0x7e */ { NULL, NULL, 0 },
1135 /* 0x7f */ { NULL, NULL, 0 },
1136 /* 0x80 */ { "SMBdskattr",reply_dskattr,AS_USER},
1137 /* 0x81 */ { "SMBsearch",reply_search,AS_USER},
1138 /* 0x82 */ { "SMBffirst",reply_search,AS_USER},
1139 /* 0x83 */ { "SMBfunique",reply_search,AS_USER},
1140 /* 0x84 */ { "SMBfclose",reply_fclose,AS_USER},
1141 /* 0x85 */ { NULL, NULL, 0 },
1142 /* 0x86 */ { NULL, NULL, 0 },
1143 /* 0x87 */ { NULL, NULL, 0 },
1144 /* 0x88 */ { NULL, NULL, 0 },
1145 /* 0x89 */ { NULL, NULL, 0 },
1146 /* 0x8a */ { NULL, NULL, 0 },
1147 /* 0x8b */ { NULL, NULL, 0 },
1148 /* 0x8c */ { NULL, NULL, 0 },
1149 /* 0x8d */ { NULL, NULL, 0 },
1150 /* 0x8e */ { NULL, NULL, 0 },
1151 /* 0x8f */ { NULL, NULL, 0 },
1152 /* 0x90 */ { NULL, NULL, 0 },
1153 /* 0x91 */ { NULL, NULL, 0 },
1154 /* 0x92 */ { NULL, NULL, 0 },
1155 /* 0x93 */ { NULL, NULL, 0 },
1156 /* 0x94 */ { NULL, NULL, 0 },
1157 /* 0x95 */ { NULL, NULL, 0 },
1158 /* 0x96 */ { NULL, NULL, 0 },
1159 /* 0x97 */ { NULL, NULL, 0 },
1160 /* 0x98 */ { NULL, NULL, 0 },
1161 /* 0x99 */ { NULL, NULL, 0 },
1162 /* 0x9a */ { NULL, NULL, 0 },
1163 /* 0x9b */ { NULL, NULL, 0 },
1164 /* 0x9c */ { NULL, NULL, 0 },
1165 /* 0x9d */ { NULL, NULL, 0 },
1166 /* 0x9e */ { NULL, NULL, 0 },
1167 /* 0x9f */ { NULL, NULL, 0 },
1168 /* 0xa0 */ { "SMBnttrans",reply_nttrans, AS_USER | CAN_IPC },
1169 /* 0xa1 */ { "SMBnttranss",reply_nttranss, AS_USER | CAN_IPC },
1170 /* 0xa2 */ { "SMBntcreateX",reply_ntcreate_and_X, AS_USER | CAN_IPC },
1171 /* 0xa3 */ { NULL, NULL, 0 },
1172 /* 0xa4 */ { "SMBntcancel",reply_ntcancel, 0 },
1173 /* 0xa5 */ { "SMBntrename",reply_ntrename, AS_USER | NEED_WRITE },
1174 /* 0xa6 */ { NULL, NULL, 0 },
1175 /* 0xa7 */ { NULL, NULL, 0 },
1176 /* 0xa8 */ { NULL, NULL, 0 },
1177 /* 0xa9 */ { NULL, NULL, 0 },
1178 /* 0xaa */ { NULL, NULL, 0 },
1179 /* 0xab */ { NULL, NULL, 0 },
1180 /* 0xac */ { NULL, NULL, 0 },
1181 /* 0xad */ { NULL, NULL, 0 },
1182 /* 0xae */ { NULL, NULL, 0 },
1183 /* 0xaf */ { NULL, NULL, 0 },
1184 /* 0xb0 */ { NULL, NULL, 0 },
1185 /* 0xb1 */ { NULL, NULL, 0 },
1186 /* 0xb2 */ { NULL, NULL, 0 },
1187 /* 0xb3 */ { NULL, NULL, 0 },
1188 /* 0xb4 */ { NULL, NULL, 0 },
1189 /* 0xb5 */ { NULL, NULL, 0 },
1190 /* 0xb6 */ { NULL, NULL, 0 },
1191 /* 0xb7 */ { NULL, NULL, 0 },
1192 /* 0xb8 */ { NULL, NULL, 0 },
1193 /* 0xb9 */ { NULL, NULL, 0 },
1194 /* 0xba */ { NULL, NULL, 0 },
1195 /* 0xbb */ { NULL, NULL, 0 },
1196 /* 0xbc */ { NULL, NULL, 0 },
1197 /* 0xbd */ { NULL, NULL, 0 },
1198 /* 0xbe */ { NULL, NULL, 0 },
1199 /* 0xbf */ { NULL, NULL, 0 },
1200 /* 0xc0 */ { "SMBsplopen",reply_printopen,AS_USER},
1201 /* 0xc1 */ { "SMBsplwr",reply_printwrite,AS_USER},
1202 /* 0xc2 */ { "SMBsplclose",reply_printclose,AS_USER},
1203 /* 0xc3 */ { "SMBsplretq",reply_printqueue,AS_USER},
1204 /* 0xc4 */ { NULL, NULL, 0 },
1205 /* 0xc5 */ { NULL, NULL, 0 },
1206 /* 0xc6 */ { NULL, NULL, 0 },
1207 /* 0xc7 */ { NULL, NULL, 0 },
1208 /* 0xc8 */ { NULL, NULL, 0 },
1209 /* 0xc9 */ { NULL, NULL, 0 },
1210 /* 0xca */ { NULL, NULL, 0 },
1211 /* 0xcb */ { NULL, NULL, 0 },
1212 /* 0xcc */ { NULL, NULL, 0 },
1213 /* 0xcd */ { NULL, NULL, 0 },
1214 /* 0xce */ { NULL, NULL, 0 },
1215 /* 0xcf */ { NULL, NULL, 0 },
1216 /* 0xd0 */ { "SMBsends",reply_sends,AS_GUEST},
1217 /* 0xd1 */ { "SMBsendb", NULL,AS_GUEST},
1218 /* 0xd2 */ { "SMBfwdname", NULL,AS_GUEST},
1219 /* 0xd3 */ { "SMBcancelf", NULL,AS_GUEST},
1220 /* 0xd4 */ { "SMBgetmac", NULL,AS_GUEST},
1221 /* 0xd5 */ { "SMBsendstrt",reply_sendstrt,AS_GUEST},
1222 /* 0xd6 */ { "SMBsendend",reply_sendend,AS_GUEST},
1223 /* 0xd7 */ { "SMBsendtxt",reply_sendtxt,AS_GUEST},
1224 /* 0xd8 */ { NULL, NULL, 0 },
1225 /* 0xd9 */ { NULL, NULL, 0 },
1226 /* 0xda */ { NULL, NULL, 0 },
1227 /* 0xdb */ { NULL, NULL, 0 },
1228 /* 0xdc */ { NULL, NULL, 0 },
1229 /* 0xdd */ { NULL, NULL, 0 },
1230 /* 0xde */ { NULL, NULL, 0 },
1231 /* 0xdf */ { NULL, NULL, 0 },
1232 /* 0xe0 */ { NULL, NULL, 0 },
1233 /* 0xe1 */ { NULL, NULL, 0 },
1234 /* 0xe2 */ { NULL, NULL, 0 },
1235 /* 0xe3 */ { NULL, NULL, 0 },
1236 /* 0xe4 */ { NULL, NULL, 0 },
1237 /* 0xe5 */ { NULL, NULL, 0 },
1238 /* 0xe6 */ { NULL, NULL, 0 },
1239 /* 0xe7 */ { NULL, NULL, 0 },
1240 /* 0xe8 */ { NULL, NULL, 0 },
1241 /* 0xe9 */ { NULL, NULL, 0 },
1242 /* 0xea */ { NULL, NULL, 0 },
1243 /* 0xeb */ { NULL, NULL, 0 },
1244 /* 0xec */ { NULL, NULL, 0 },
1245 /* 0xed */ { NULL, NULL, 0 },
1246 /* 0xee */ { NULL, NULL, 0 },
1247 /* 0xef */ { NULL, NULL, 0 },
1248 /* 0xf0 */ { NULL, NULL, 0 },
1249 /* 0xf1 */ { NULL, NULL, 0 },
1250 /* 0xf2 */ { NULL, NULL, 0 },
1251 /* 0xf3 */ { NULL, NULL, 0 },
1252 /* 0xf4 */ { NULL, NULL, 0 },
1253 /* 0xf5 */ { NULL, NULL, 0 },
1254 /* 0xf6 */ { NULL, NULL, 0 },
1255 /* 0xf7 */ { NULL, NULL, 0 },
1256 /* 0xf8 */ { NULL, NULL, 0 },
1257 /* 0xf9 */ { NULL, NULL, 0 },
1258 /* 0xfa */ { NULL, NULL, 0 },
1259 /* 0xfb */ { NULL, NULL, 0 },
1260 /* 0xfc */ { NULL, NULL, 0 },
1261 /* 0xfd */ { NULL, NULL, 0 },
1262 /* 0xfe */ { NULL, NULL, 0 },
1263 /* 0xff */ { NULL, NULL, 0 }
1264
1265 };
1266
1267 /*******************************************************************
1268  allocate and initialize a reply packet
1269 ********************************************************************/
1270
1271 static bool create_outbuf(TALLOC_CTX *mem_ctx, struct smb_request *req,
1272                           const char *inbuf, char **outbuf, uint8_t num_words,
1273                           uint32_t num_bytes)
1274 {
1275         /*
1276          * Protect against integer wrap
1277          */
1278         if ((num_bytes > 0xffffff)
1279             || ((num_bytes + smb_size + num_words*2) > 0xffffff)) {
1280                 char *msg;
1281                 if (asprintf(&msg, "num_bytes too large: %u",
1282                              (unsigned)num_bytes) == -1) {
1283                         msg = discard_const_p(char, "num_bytes too large");
1284                 }
1285                 smb_panic(msg);
1286         }
1287
1288         *outbuf = talloc_array(mem_ctx, char,
1289                                smb_size + num_words*2 + num_bytes);
1290         if (*outbuf == NULL) {
1291                 return false;
1292         }
1293
1294         construct_reply_common(req, inbuf, *outbuf);
1295         srv_set_message(*outbuf, num_words, num_bytes, false);
1296         /*
1297          * Zero out the word area, the caller has to take care of the bcc area
1298          * himself
1299          */
1300         if (num_words != 0) {
1301                 memset(*outbuf + smb_vwv0, 0, num_words*2);
1302         }
1303
1304         return true;
1305 }
1306
1307 void reply_outbuf(struct smb_request *req, uint8 num_words, uint32 num_bytes)
1308 {
1309         char *outbuf;
1310         if (!create_outbuf(req, req, (const char *)req->inbuf, &outbuf, num_words,
1311                            num_bytes)) {
1312                 smb_panic("could not allocate output buffer\n");
1313         }
1314         req->outbuf = (uint8_t *)outbuf;
1315 }
1316
1317
1318 /*******************************************************************
1319  Dump a packet to a file.
1320 ********************************************************************/
1321
1322 static void smb_dump(const char *name, int type, const char *data, ssize_t len)
1323 {
1324         int fd, i;
1325         char *fname = NULL;
1326         if (DEBUGLEVEL < 50) {
1327                 return;
1328         }
1329
1330         if (len < 4) len = smb_len(data)+4;
1331         for (i=1;i<100;i++) {
1332                 if (asprintf(&fname, "/tmp/%s.%d.%s", name, i,
1333                              type ? "req" : "resp") == -1) {
1334                         return;
1335                 }
1336                 fd = open(fname, O_WRONLY|O_CREAT|O_EXCL, 0644);
1337                 if (fd != -1 || errno != EEXIST) break;
1338         }
1339         if (fd != -1) {
1340                 ssize_t ret = write(fd, data, len);
1341                 if (ret != len)
1342                         DEBUG(0,("smb_dump: problem: write returned %d\n", (int)ret ));
1343                 close(fd);
1344                 DEBUG(0,("created %s len %lu\n", fname, (unsigned long)len));
1345         }
1346         SAFE_FREE(fname);
1347 }
1348
1349 /****************************************************************************
1350  Prepare everything for calling the actual request function, and potentially
1351  call the request function via the "new" interface.
1352
1353  Return False if the "legacy" function needs to be called, everything is
1354  prepared.
1355
1356  Return True if we're done.
1357
1358  I know this API sucks, but it is the one with the least code change I could
1359  find.
1360 ****************************************************************************/
1361
1362 static connection_struct *switch_message(uint8 type, struct smb_request *req, int size)
1363 {
1364         int flags;
1365         uint16 session_tag;
1366         connection_struct *conn = NULL;
1367         struct smbd_server_connection *sconn = req->sconn;
1368         char *raddr;
1369
1370         errno = 0;
1371
1372         /* Make sure this is an SMB packet. smb_size contains NetBIOS header
1373          * so subtract 4 from it. */
1374         if (!valid_smb_header(req->inbuf)
1375             || (size < (smb_size - 4))) {
1376                 DEBUG(2,("Non-SMB packet of length %d. Terminating server\n",
1377                          smb_len(req->inbuf)));
1378                 exit_server_cleanly("Non-SMB packet");
1379         }
1380
1381         if (smb_messages[type].fn == NULL) {
1382                 DEBUG(0,("Unknown message type %d!\n",type));
1383                 smb_dump("Unknown", 1, (const char *)req->inbuf, size);
1384                 reply_unknown_new(req, type);
1385                 return NULL;
1386         }
1387
1388         flags = smb_messages[type].flags;
1389
1390         /* In share mode security we must ignore the vuid. */
1391         session_tag = (lp_security() == SEC_SHARE)
1392                 ? UID_FIELD_INVALID : req->vuid;
1393         conn = req->conn;
1394
1395         DEBUG(3,("switch message %s (pid %d) conn 0x%lx\n", smb_fn_name(type),
1396                  (int)sys_getpid(), (unsigned long)conn));
1397
1398         smb_dump(smb_fn_name(type), 1, (const char *)req->inbuf, size);
1399
1400         /* Ensure this value is replaced in the incoming packet. */
1401         SSVAL(discard_const_p(uint8_t, req->inbuf),smb_uid,session_tag);
1402
1403         /*
1404          * Ensure the correct username is in current_user_info.  This is a
1405          * really ugly bugfix for problems with multiple session_setup_and_X's
1406          * being done and allowing %U and %G substitutions to work correctly.
1407          * There is a reason this code is done here, don't move it unless you
1408          * know what you're doing... :-).
1409          * JRA.
1410          */
1411
1412         if (session_tag != sconn->smb1.sessions.last_session_tag) {
1413                 user_struct *vuser = NULL;
1414
1415                 sconn->smb1.sessions.last_session_tag = session_tag;
1416                 if(session_tag != UID_FIELD_INVALID) {
1417                         vuser = get_valid_user_struct(sconn, session_tag);
1418                         if (vuser) {
1419                                 set_current_user_info(
1420                                         vuser->session_info->unix_info->sanitized_username,
1421                                         vuser->session_info->unix_info->unix_name,
1422                                         vuser->session_info->info->domain_name);
1423                         }
1424                 }
1425         }
1426
1427         /* Does this call need to be run as the connected user? */
1428         if (flags & AS_USER) {
1429
1430                 /* Does this call need a valid tree connection? */
1431                 if (!conn) {
1432                         /*
1433                          * Amazingly, the error code depends on the command
1434                          * (from Samba4).
1435                          */
1436                         if (type == SMBntcreateX) {
1437                                 reply_nterror(req, NT_STATUS_INVALID_HANDLE);
1438                         } else {
1439                                 reply_nterror(req, NT_STATUS_NETWORK_NAME_DELETED);
1440                         }
1441                         return NULL;
1442                 }
1443
1444                 if (!change_to_user(conn,session_tag)) {
1445                         DEBUG(0, ("Error: Could not change to user. Removing "
1446                                 "deferred open, mid=%llu.\n",
1447                                 (unsigned long long)req->mid));
1448                         reply_force_doserror(req, ERRSRV, ERRbaduid);
1449                         return conn;
1450                 }
1451
1452                 /* All NEED_WRITE and CAN_IPC flags must also have AS_USER. */
1453
1454                 /* Does it need write permission? */
1455                 if ((flags & NEED_WRITE) && !CAN_WRITE(conn)) {
1456                         reply_nterror(req, NT_STATUS_MEDIA_WRITE_PROTECTED);
1457                         return conn;
1458                 }
1459
1460                 /* IPC services are limited */
1461                 if (IS_IPC(conn) && !(flags & CAN_IPC)) {
1462                         reply_nterror(req, NT_STATUS_ACCESS_DENIED);
1463                         return conn;
1464                 }
1465         } else {
1466                 /* This call needs to be run as root */
1467                 change_to_root_user();
1468         }
1469
1470         /* load service specific parameters */
1471         if (conn) {
1472                 if (req->encrypted) {
1473                         conn->encrypted_tid = true;
1474                         /* encrypted required from now on. */
1475                         conn->encrypt_level = Required;
1476                 } else if (ENCRYPTION_REQUIRED(conn)) {
1477                         if (req->cmd != SMBtrans2 && req->cmd != SMBtranss2) {
1478                                 exit_server_cleanly("encryption required "
1479                                         "on connection");
1480                                 return conn;
1481                         }
1482                 }
1483
1484                 if (!set_current_service(conn,SVAL(req->inbuf,smb_flg),
1485                                          (flags & (AS_USER|DO_CHDIR)
1486                                           ?True:False))) {
1487                         reply_nterror(req, NT_STATUS_ACCESS_DENIED);
1488                         return conn;
1489                 }
1490                 conn->num_smb_operations++;
1491         }
1492
1493         raddr = tsocket_address_inet_addr_string(sconn->remote_address,
1494                                                  talloc_tos());
1495         if (raddr == NULL) {
1496                 reply_nterror(req, NT_STATUS_NO_MEMORY);
1497                 return conn;
1498         }
1499
1500         /* does this protocol need to be run as guest? */
1501         if ((flags & AS_GUEST)
1502             && (!change_to_guest() ||
1503                 !allow_access(lp_hostsdeny(-1), lp_hostsallow(-1),
1504                               sconn->remote_hostname,
1505                               raddr))) {
1506                 reply_nterror(req, NT_STATUS_ACCESS_DENIED);
1507                 return conn;
1508         }
1509
1510         smb_messages[type].fn(req);
1511         return req->conn;
1512 }
1513
1514 /****************************************************************************
1515  Construct a reply to the incoming packet.
1516 ****************************************************************************/
1517
1518 static void construct_reply(struct smbd_server_connection *sconn,
1519                             char *inbuf, int size, size_t unread_bytes,
1520                             uint32_t seqnum, bool encrypted,
1521                             struct smb_perfcount_data *deferred_pcd)
1522 {
1523         connection_struct *conn;
1524         struct smb_request *req;
1525
1526         if (!(req = talloc(talloc_tos(), struct smb_request))) {
1527                 smb_panic("could not allocate smb_request");
1528         }
1529
1530         if (!init_smb_request(req, sconn, (uint8 *)inbuf, unread_bytes,
1531                               encrypted, seqnum)) {
1532                 exit_server_cleanly("Invalid SMB request");
1533         }
1534
1535         req->inbuf  = (uint8_t *)talloc_move(req, &inbuf);
1536
1537         /* we popped this message off the queue - keep original perf data */
1538         if (deferred_pcd)
1539                 req->pcd = *deferred_pcd;
1540         else {
1541                 SMB_PERFCOUNT_START(&req->pcd);
1542                 SMB_PERFCOUNT_SET_OP(&req->pcd, req->cmd);
1543                 SMB_PERFCOUNT_SET_MSGLEN_IN(&req->pcd, size);
1544         }
1545
1546         conn = switch_message(req->cmd, req, size);
1547
1548         if (req->unread_bytes) {
1549                 /* writeX failed. drain socket. */
1550                 if (drain_socket(req->sconn->sock, req->unread_bytes) !=
1551                                 req->unread_bytes) {
1552                         smb_panic("failed to drain pending bytes");
1553                 }
1554                 req->unread_bytes = 0;
1555         }
1556
1557         if (req->done) {
1558                 TALLOC_FREE(req);
1559                 return;
1560         }
1561
1562         if (req->outbuf == NULL) {
1563                 return;
1564         }
1565
1566         if (CVAL(req->outbuf,0) == 0) {
1567                 show_msg((char *)req->outbuf);
1568         }
1569
1570         if (!srv_send_smb(req->sconn,
1571                         (char *)req->outbuf,
1572                         true, req->seqnum+1,
1573                         IS_CONN_ENCRYPTED(conn)||req->encrypted,
1574                         &req->pcd)) {
1575                 exit_server_cleanly("construct_reply: srv_send_smb failed.");
1576         }
1577
1578         TALLOC_FREE(req);
1579
1580         return;
1581 }
1582
1583 /****************************************************************************
1584  Process an smb from the client
1585 ****************************************************************************/
1586 static void process_smb(struct smbd_server_connection *sconn,
1587                         uint8_t *inbuf, size_t nread, size_t unread_bytes,
1588                         uint32_t seqnum, bool encrypted,
1589                         struct smb_perfcount_data *deferred_pcd)
1590 {
1591         int msg_type = CVAL(inbuf,0);
1592
1593         DO_PROFILE_INC(smb_count);
1594
1595         DEBUG( 6, ( "got message type 0x%x of len 0x%x\n", msg_type,
1596                     smb_len(inbuf) ) );
1597         DEBUG(3, ("Transaction %d of length %d (%u toread)\n",
1598                   sconn->trans_num, (int)nread, (unsigned int)unread_bytes));
1599
1600         if (msg_type != NBSSmessage) {
1601                 /*
1602                  * NetBIOS session request, keepalive, etc.
1603                  */
1604                 reply_special(sconn, (char *)inbuf, nread);
1605                 goto done;
1606         }
1607
1608         if (sconn->using_smb2) {
1609                 /* At this point we're not really using smb2,
1610                  * we make the decision here.. */
1611                 if (smbd_is_smb2_header(inbuf, nread)) {
1612                         smbd_smb2_first_negprot(sconn, inbuf, nread);
1613                         return;
1614                 } else if (nread >= smb_size && valid_smb_header(inbuf)
1615                                 && CVAL(inbuf, smb_com) != 0x72) {
1616                         /* This is a non-negprot SMB1 packet.
1617                            Disable SMB2 from now on. */
1618                         sconn->using_smb2 = false;
1619                 }
1620         }
1621
1622         show_msg((char *)inbuf);
1623
1624         construct_reply(sconn, (char *)inbuf, nread, unread_bytes, seqnum,
1625                         encrypted, deferred_pcd);
1626         sconn->trans_num++;
1627
1628 done:
1629         sconn->num_requests++;
1630
1631         /* The timeout_processing function isn't run nearly
1632            often enough to implement 'max log size' without
1633            overrunning the size of the file by many megabytes.
1634            This is especially true if we are running at debug
1635            level 10.  Checking every 50 SMBs is a nice
1636            tradeoff of performance vs log file size overrun. */
1637
1638         if ((sconn->num_requests % 50) == 0 &&
1639             need_to_check_log_size()) {
1640                 change_to_root_user();
1641                 check_log_size();
1642         }
1643 }
1644
1645 /****************************************************************************
1646  Return a string containing the function name of a SMB command.
1647 ****************************************************************************/
1648
1649 const char *smb_fn_name(int type)
1650 {
1651         const char *unknown_name = "SMBunknown";
1652
1653         if (smb_messages[type].name == NULL)
1654                 return(unknown_name);
1655
1656         return(smb_messages[type].name);
1657 }
1658
1659 /****************************************************************************
1660  Helper functions for contruct_reply.
1661 ****************************************************************************/
1662
1663 void add_to_common_flags2(uint32 v)
1664 {
1665         common_flags2 |= v;
1666 }
1667
1668 void remove_from_common_flags2(uint32 v)
1669 {
1670         common_flags2 &= ~v;
1671 }
1672
1673 static void construct_reply_common(struct smb_request *req, const char *inbuf,
1674                                    char *outbuf)
1675 {
1676         srv_set_message(outbuf,0,0,false);
1677
1678         SCVAL(outbuf, smb_com, req->cmd);
1679         SIVAL(outbuf,smb_rcls,0);
1680         SCVAL(outbuf,smb_flg, FLAG_REPLY | (CVAL(inbuf,smb_flg) & FLAG_CASELESS_PATHNAMES));
1681         SSVAL(outbuf,smb_flg2,
1682                 (SVAL(inbuf,smb_flg2) & FLAGS2_UNICODE_STRINGS) |
1683                 common_flags2);
1684         memset(outbuf+smb_pidhigh,'\0',(smb_tid-smb_pidhigh));
1685
1686         SSVAL(outbuf,smb_tid,SVAL(inbuf,smb_tid));
1687         SSVAL(outbuf,smb_pid,SVAL(inbuf,smb_pid));
1688         SSVAL(outbuf,smb_uid,SVAL(inbuf,smb_uid));
1689         SSVAL(outbuf,smb_mid,SVAL(inbuf,smb_mid));
1690 }
1691
1692 void construct_reply_common_req(struct smb_request *req, char *outbuf)
1693 {
1694         construct_reply_common(req, (const char *)req->inbuf, outbuf);
1695 }
1696
1697 /*
1698  * How many bytes have we already accumulated up to the current wct field
1699  * offset?
1700  */
1701
1702 size_t req_wct_ofs(struct smb_request *req)
1703 {
1704         size_t buf_size;
1705
1706         if (req->chain_outbuf == NULL) {
1707                 return smb_wct - 4;
1708         }
1709         buf_size = talloc_get_size(req->chain_outbuf);
1710         if ((buf_size % 4) != 0) {
1711                 buf_size += (4 - (buf_size % 4));
1712         }
1713         return buf_size - 4;
1714 }
1715
1716 /*
1717  * Hack around reply_nterror & friends not being aware of chained requests,
1718  * generating illegal (i.e. wct==0) chain replies.
1719  */
1720
1721 static void fixup_chain_error_packet(struct smb_request *req)
1722 {
1723         uint8_t *outbuf = req->outbuf;
1724         req->outbuf = NULL;
1725         reply_outbuf(req, 2, 0);
1726         memcpy(req->outbuf, outbuf, smb_wct);
1727         TALLOC_FREE(outbuf);
1728         SCVAL(req->outbuf, smb_vwv0, 0xff);
1729 }
1730
1731 /**
1732  * @brief Find the smb_cmd offset of the last command pushed
1733  * @param[in] buf       The buffer we're building up
1734  * @retval              Where can we put our next andx cmd?
1735  *
1736  * While chaining requests, the "next" request we're looking at needs to put
1737  * its SMB_Command before the data the previous request already built up added
1738  * to the chain. Find the offset to the place where we have to put our cmd.
1739  */
1740
1741 static bool find_andx_cmd_ofs(uint8_t *buf, size_t *pofs)
1742 {
1743         uint8_t cmd;
1744         size_t ofs;
1745
1746         cmd = CVAL(buf, smb_com);
1747
1748         SMB_ASSERT(is_andx_req(cmd));
1749
1750         ofs = smb_vwv0;
1751
1752         while (CVAL(buf, ofs) != 0xff) {
1753
1754                 if (!is_andx_req(CVAL(buf, ofs))) {
1755                         return false;
1756                 }
1757
1758                 /*
1759                  * ofs is from start of smb header, so add the 4 length
1760                  * bytes. The next cmd is right after the wct field.
1761                  */
1762                 ofs = SVAL(buf, ofs+2) + 4 + 1;
1763
1764                 SMB_ASSERT(ofs+4 < talloc_get_size(buf));
1765         }
1766
1767         *pofs = ofs;
1768         return true;
1769 }
1770
1771 /**
1772  * @brief Do the smb chaining at a buffer level
1773  * @param[in] poutbuf           Pointer to the talloc'ed buffer to be modified
1774  * @param[in] smb_command       The command that we want to issue
1775  * @param[in] wct               How many words?
1776  * @param[in] vwv               The words, already in network order
1777  * @param[in] bytes_alignment   How shall we align "bytes"?
1778  * @param[in] num_bytes         How many bytes?
1779  * @param[in] bytes             The data the request ships
1780  *
1781  * smb_splice_chain() adds the vwv and bytes to the request already present in
1782  * *poutbuf.
1783  */
1784
1785 static bool smb_splice_chain(uint8_t **poutbuf, uint8_t smb_command,
1786                              uint8_t wct, const uint16_t *vwv,
1787                              size_t bytes_alignment,
1788                              uint32_t num_bytes, const uint8_t *bytes)
1789 {
1790         uint8_t *outbuf;
1791         size_t old_size, new_size;
1792         size_t ofs;
1793         size_t chain_padding = 0;
1794         size_t bytes_padding = 0;
1795         bool first_request;
1796
1797         old_size = talloc_get_size(*poutbuf);
1798
1799         /*
1800          * old_size == smb_wct means we're pushing the first request in for
1801          * libsmb/
1802          */
1803
1804         first_request = (old_size == smb_wct);
1805
1806         if (!first_request && ((old_size % 4) != 0)) {
1807                 /*
1808                  * Align the wct field of subsequent requests to a 4-byte
1809                  * boundary
1810                  */
1811                 chain_padding = 4 - (old_size % 4);
1812         }
1813
1814         /*
1815          * After the old request comes the new wct field (1 byte), the vwv's
1816          * and the num_bytes field. After at we might need to align the bytes
1817          * given to us to "bytes_alignment", increasing the num_bytes value.
1818          */
1819
1820         new_size = old_size + chain_padding + 1 + wct * sizeof(uint16_t) + 2;
1821
1822         if ((bytes_alignment != 0) && ((new_size % bytes_alignment) != 0)) {
1823                 bytes_padding = bytes_alignment - (new_size % bytes_alignment);
1824         }
1825
1826         new_size += bytes_padding + num_bytes;
1827
1828         if ((smb_command != SMBwriteX) && (new_size > 0xffff)) {
1829                 DEBUG(1, ("splice_chain: %u bytes won't fit\n",
1830                           (unsigned)new_size));
1831                 return false;
1832         }
1833
1834         outbuf = talloc_realloc(NULL, *poutbuf, uint8_t, new_size);
1835         if (outbuf == NULL) {
1836                 DEBUG(0, ("talloc failed\n"));
1837                 return false;
1838         }
1839         *poutbuf = outbuf;
1840
1841         if (first_request) {
1842                 SCVAL(outbuf, smb_com, smb_command);
1843         } else {
1844                 size_t andx_cmd_ofs;
1845
1846                 if (!find_andx_cmd_ofs(outbuf, &andx_cmd_ofs)) {
1847                         DEBUG(1, ("invalid command chain\n"));
1848                         *poutbuf = talloc_realloc(
1849                                 NULL, *poutbuf, uint8_t, old_size);
1850                         return false;
1851                 }
1852
1853                 if (chain_padding != 0) {
1854                         memset(outbuf + old_size, 0, chain_padding);
1855                         old_size += chain_padding;
1856                 }
1857
1858                 SCVAL(outbuf, andx_cmd_ofs, smb_command);
1859                 SSVAL(outbuf, andx_cmd_ofs + 2, old_size - 4);
1860         }
1861
1862         ofs = old_size;
1863
1864         /*
1865          * Push the chained request:
1866          *
1867          * wct field
1868          */
1869
1870         SCVAL(outbuf, ofs, wct);
1871         ofs += 1;
1872
1873         /*
1874          * vwv array
1875          */
1876
1877         memcpy(outbuf + ofs, vwv, sizeof(uint16_t) * wct);
1878         ofs += sizeof(uint16_t) * wct;
1879
1880         /*
1881          * bcc (byte count)
1882          */
1883
1884         SSVAL(outbuf, ofs, num_bytes + bytes_padding);
1885         ofs += sizeof(uint16_t);
1886
1887         /*
1888          * padding
1889          */
1890
1891         if (bytes_padding != 0) {
1892                 memset(outbuf + ofs, 0, bytes_padding);
1893                 ofs += bytes_padding;
1894         }
1895
1896         /*
1897          * The bytes field
1898          */
1899
1900         memcpy(outbuf + ofs, bytes, num_bytes);
1901
1902         return true;
1903 }
1904
1905 /****************************************************************************
1906  Construct a chained reply and add it to the already made reply
1907 ****************************************************************************/
1908
1909 void chain_reply(struct smb_request *req)
1910 {
1911         size_t smblen = smb_len(req->inbuf);
1912         size_t already_used, length_needed;
1913         uint8_t chain_cmd;
1914         uint32_t chain_offset;  /* uint32_t to avoid overflow */
1915
1916         uint8_t wct;
1917         const uint16_t *vwv;
1918         uint16_t buflen;
1919         const uint8_t *buf;
1920
1921         if (IVAL(req->outbuf, smb_rcls) != 0) {
1922                 fixup_chain_error_packet(req);
1923         }
1924
1925         /*
1926          * Any of the AndX requests and replies have at least a wct of
1927          * 2. vwv[0] is the next command, vwv[1] is the offset from the
1928          * beginning of the SMB header to the next wct field.
1929          *
1930          * None of the AndX requests put anything valuable in vwv[0] and [1],
1931          * so we can overwrite it here to form the chain.
1932          */
1933
1934         if ((req->wct < 2) || (CVAL(req->outbuf, smb_wct) < 2)) {
1935                 if (req->chain_outbuf == NULL) {
1936                         req->chain_outbuf = talloc_realloc(
1937                                 req, req->outbuf, uint8_t,
1938                                 smb_len(req->outbuf) + 4);
1939                         if (req->chain_outbuf == NULL) {
1940                                 smb_panic("talloc failed");
1941                         }
1942                 }
1943                 req->outbuf = NULL;
1944                 goto error;
1945         }
1946
1947         /*
1948          * Here we assume that this is the end of the chain. For that we need
1949          * to set "next command" to 0xff and the offset to 0. If we later find
1950          * more commands in the chain, this will be overwritten again.
1951          */
1952
1953         SCVAL(req->outbuf, smb_vwv0, 0xff);
1954         SCVAL(req->outbuf, smb_vwv0+1, 0);
1955         SSVAL(req->outbuf, smb_vwv1, 0);
1956
1957         if (req->chain_outbuf == NULL) {
1958                 /*
1959                  * In req->chain_outbuf we collect all the replies. Start the
1960                  * chain by copying in the first reply.
1961                  *
1962                  * We do the realloc because later on we depend on
1963                  * talloc_get_size to determine the length of
1964                  * chain_outbuf. The reply_xxx routines might have
1965                  * over-allocated (reply_pipe_read_and_X used to be such an
1966                  * example).
1967                  */
1968                 req->chain_outbuf = talloc_realloc(
1969                         req, req->outbuf, uint8_t, smb_len(req->outbuf) + 4);
1970                 if (req->chain_outbuf == NULL) {
1971                         smb_panic("talloc failed");
1972                 }
1973                 req->outbuf = NULL;
1974         } else {
1975                 /*
1976                  * Update smb headers where subsequent chained commands
1977                  * may have updated them.
1978                  */
1979                 SSVAL(req->chain_outbuf, smb_tid, SVAL(req->outbuf, smb_tid));
1980                 SSVAL(req->chain_outbuf, smb_uid, SVAL(req->outbuf, smb_uid));
1981
1982                 if (!smb_splice_chain(&req->chain_outbuf,
1983                                       CVAL(req->outbuf, smb_com),
1984                                       CVAL(req->outbuf, smb_wct),
1985                                       (uint16_t *)(req->outbuf + smb_vwv),
1986                                       0, smb_buflen(req->outbuf),
1987                                       (uint8_t *)smb_buf(req->outbuf))) {
1988                         goto error;
1989                 }
1990                 TALLOC_FREE(req->outbuf);
1991         }
1992
1993         /*
1994          * We use the old request's vwv field to grab the next chained command
1995          * and offset into the chained fields.
1996          */
1997
1998         chain_cmd = CVAL(req->vwv+0, 0);
1999         chain_offset = SVAL(req->vwv+1, 0);
2000
2001         if (chain_cmd == 0xff) {
2002                 /*
2003                  * End of chain, no more requests from the client. So ship the
2004                  * replies.
2005                  */
2006                 smb_setlen((char *)(req->chain_outbuf),
2007                            talloc_get_size(req->chain_outbuf) - 4);
2008
2009                 if (!srv_send_smb(req->sconn, (char *)req->chain_outbuf,
2010                                   true, req->seqnum+1,
2011                                   IS_CONN_ENCRYPTED(req->conn)
2012                                   ||req->encrypted,
2013                                   &req->pcd)) {
2014                         exit_server_cleanly("chain_reply: srv_send_smb "
2015                                             "failed.");
2016                 }
2017                 TALLOC_FREE(req->chain_outbuf);
2018                 req->done = true;
2019                 return;
2020         }
2021
2022         /* add a new perfcounter for this element of chain */
2023         SMB_PERFCOUNT_ADD(&req->pcd);
2024         SMB_PERFCOUNT_SET_OP(&req->pcd, chain_cmd);
2025         SMB_PERFCOUNT_SET_MSGLEN_IN(&req->pcd, smblen);
2026
2027         /*
2028          * Check if the client tries to fool us. The request so far uses the
2029          * space to the end of the byte buffer in the request just
2030          * processed. The chain_offset can't point into that area. If that was
2031          * the case, we could end up with an endless processing of the chain,
2032          * we would always handle the same request.
2033          */
2034
2035         already_used = PTR_DIFF(req->buf+req->buflen, smb_base(req->inbuf));
2036         if (chain_offset < already_used) {
2037                 goto error;
2038         }
2039
2040         /*
2041          * Next check: Make sure the chain offset does not point beyond the
2042          * overall smb request length.
2043          */
2044
2045         length_needed = chain_offset+1; /* wct */
2046         if (length_needed > smblen) {
2047                 goto error;
2048         }
2049
2050         /*
2051          * Now comes the pointer magic. Goal here is to set up req->vwv and
2052          * req->buf correctly again to be able to call the subsequent
2053          * switch_message(). The chain offset (the former vwv[1]) points at
2054          * the new wct field.
2055          */
2056
2057         wct = CVAL(smb_base(req->inbuf), chain_offset);
2058
2059         /*
2060          * Next consistency check: Make the new vwv array fits in the overall
2061          * smb request.
2062          */
2063
2064         length_needed += (wct+1)*sizeof(uint16_t); /* vwv+buflen */
2065         if (length_needed > smblen) {
2066                 goto error;
2067         }
2068         vwv = (const uint16_t *)(smb_base(req->inbuf) + chain_offset + 1);
2069
2070         /*
2071          * Now grab the new byte buffer....
2072          */
2073
2074         buflen = SVAL(vwv+wct, 0);
2075
2076         /*
2077          * .. and check that it fits.
2078          */
2079
2080         length_needed += buflen;
2081         if (length_needed > smblen) {
2082                 goto error;
2083         }
2084         buf = (const uint8_t *)(vwv+wct+1);
2085
2086         req->cmd = chain_cmd;
2087         req->wct = wct;
2088         req->vwv = discard_const_p(uint16_t, vwv);
2089         req->buflen = buflen;
2090         req->buf = buf;
2091
2092         switch_message(chain_cmd, req, smblen);
2093
2094         if (req->outbuf == NULL) {
2095                 /*
2096                  * This happens if the chained command has suspended itself or
2097                  * if it has called srv_send_smb() itself.
2098                  */
2099                 return;
2100         }
2101
2102         /*
2103          * We end up here if the chained command was not itself chained or
2104          * suspended, but for example a close() command. We now need to splice
2105          * the chained commands' outbuf into the already built up chain_outbuf
2106          * and ship the result.
2107          */
2108         goto done;
2109
2110  error:
2111         /*
2112          * We end up here if there's any error in the chain syntax. Report a
2113          * DOS error, just like Windows does.
2114          */
2115         reply_force_doserror(req, ERRSRV, ERRerror);
2116         fixup_chain_error_packet(req);
2117
2118  done:
2119         /*
2120          * This scary statement intends to set the
2121          * FLAGS2_32_BIT_ERROR_CODES flg2 field in req->chain_outbuf
2122          * to the value req->outbuf carries
2123          */
2124         SSVAL(req->chain_outbuf, smb_flg2,
2125               (SVAL(req->chain_outbuf, smb_flg2) & ~FLAGS2_32_BIT_ERROR_CODES)
2126               | (SVAL(req->outbuf, smb_flg2) & FLAGS2_32_BIT_ERROR_CODES));
2127
2128         /*
2129          * Transfer the error codes from the subrequest to the main one
2130          */
2131         SSVAL(req->chain_outbuf, smb_rcls, SVAL(req->outbuf, smb_rcls));
2132         SSVAL(req->chain_outbuf, smb_err, SVAL(req->outbuf, smb_err));
2133
2134         if (!smb_splice_chain(&req->chain_outbuf,
2135                               CVAL(req->outbuf, smb_com),
2136                               CVAL(req->outbuf, smb_wct),
2137                               (uint16_t *)(req->outbuf + smb_vwv),
2138                               0, smb_buflen(req->outbuf),
2139                               (uint8_t *)smb_buf(req->outbuf))) {
2140                 exit_server_cleanly("chain_reply: smb_splice_chain failed\n");
2141         }
2142         TALLOC_FREE(req->outbuf);
2143
2144         smb_setlen((char *)(req->chain_outbuf),
2145                    talloc_get_size(req->chain_outbuf) - 4);
2146
2147         show_msg((char *)(req->chain_outbuf));
2148
2149         if (!srv_send_smb(req->sconn, (char *)req->chain_outbuf,
2150                           true, req->seqnum+1,
2151                           IS_CONN_ENCRYPTED(req->conn)||req->encrypted,
2152                           &req->pcd)) {
2153                 exit_server_cleanly("chain_reply: srv_send_smb failed.");
2154         }
2155         TALLOC_FREE(req->chain_outbuf);
2156         req->done = true;
2157 }
2158
2159 /****************************************************************************
2160  Check if services need reloading.
2161 ****************************************************************************/
2162
2163 static void check_reload(struct smbd_server_connection *sconn, time_t t)
2164 {
2165
2166         if (last_smb_conf_reload_time == 0) {
2167                 last_smb_conf_reload_time = t;
2168         }
2169
2170         if (t >= last_smb_conf_reload_time+SMBD_RELOAD_CHECK) {
2171                 reload_services(sconn->msg_ctx, sconn->sock, True);
2172                 last_smb_conf_reload_time = t;
2173         }
2174 }
2175
2176 static bool fd_is_readable(int fd)
2177 {
2178         int ret, revents;
2179
2180         ret = poll_one_fd(fd, POLLIN|POLLHUP, 0, &revents);
2181
2182         return ((ret > 0) && ((revents & (POLLIN|POLLHUP|POLLERR)) != 0));
2183
2184 }
2185
2186 static void smbd_server_connection_write_handler(
2187         struct smbd_server_connection *sconn)
2188 {
2189         /* TODO: make write nonblocking */
2190 }
2191
2192 static void smbd_server_connection_read_handler(
2193         struct smbd_server_connection *sconn, int fd)
2194 {
2195         uint8_t *inbuf = NULL;
2196         size_t inbuf_len = 0;
2197         size_t unread_bytes = 0;
2198         bool encrypted = false;
2199         TALLOC_CTX *mem_ctx = talloc_tos();
2200         NTSTATUS status;
2201         uint32_t seqnum;
2202
2203         bool from_client = (sconn->sock == fd);
2204
2205         if (from_client) {
2206                 smbd_lock_socket(sconn);
2207
2208                 if (lp_async_smb_echo_handler()) {
2209
2210                         if (fd_is_readable(sconn->smb1.echo_handler.trusted_fd)) {
2211                                 /*
2212                                  * This is the super-ugly hack to
2213                                  * prefer the packets forwarded by the
2214                                  * echo handler over the ones by the
2215                                  * client directly
2216                                  */
2217                                 fd = sconn->smb1.echo_handler.trusted_fd;
2218                         } else if (!fd_is_readable(fd)) {
2219                                 DEBUG(10,("the echo listener was faster\n"));
2220                                 smbd_unlock_socket(sconn);
2221                                 return;
2222                         }
2223                 }
2224
2225                 /* TODO: make this completely nonblocking */
2226                 status = receive_smb_talloc(mem_ctx, sconn, fd,
2227                                             (char **)(void *)&inbuf,
2228                                             0, /* timeout */
2229                                             &unread_bytes,
2230                                             &encrypted,
2231                                             &inbuf_len, &seqnum,
2232                                             false /* trusted channel */);
2233                 smbd_unlock_socket(sconn);
2234         } else {
2235                 /* TODO: make this completely nonblocking */
2236                 status = receive_smb_talloc(mem_ctx, sconn, fd,
2237                                             (char **)(void *)&inbuf,
2238                                             0, /* timeout */
2239                                             &unread_bytes,
2240                                             &encrypted,
2241                                             &inbuf_len, &seqnum,
2242                                             true /* trusted channel */);
2243         }
2244
2245         if (NT_STATUS_EQUAL(status, NT_STATUS_RETRY)) {
2246                 goto process;
2247         }
2248         if (NT_STATUS_IS_ERR(status)) {
2249                 exit_server_cleanly("failed to receive smb request");
2250         }
2251         if (!NT_STATUS_IS_OK(status)) {
2252                 return;
2253         }
2254
2255 process:
2256         process_smb(sconn, inbuf, inbuf_len, unread_bytes,
2257                     seqnum, encrypted, NULL);
2258 }
2259
2260 static void smbd_server_connection_handler(struct event_context *ev,
2261                                            struct fd_event *fde,
2262                                            uint16_t flags,
2263                                            void *private_data)
2264 {
2265         struct smbd_server_connection *conn = talloc_get_type(private_data,
2266                                               struct smbd_server_connection);
2267
2268         if (flags & EVENT_FD_WRITE) {
2269                 smbd_server_connection_write_handler(conn);
2270                 return;
2271         }
2272         if (flags & EVENT_FD_READ) {
2273                 smbd_server_connection_read_handler(conn, conn->sock);
2274                 return;
2275         }
2276 }
2277
2278 static void smbd_server_echo_handler(struct event_context *ev,
2279                                      struct fd_event *fde,
2280                                      uint16_t flags,
2281                                      void *private_data)
2282 {
2283         struct smbd_server_connection *conn = talloc_get_type(private_data,
2284                                               struct smbd_server_connection);
2285
2286         if (flags & EVENT_FD_WRITE) {
2287                 smbd_server_connection_write_handler(conn);
2288                 return;
2289         }
2290         if (flags & EVENT_FD_READ) {
2291                 smbd_server_connection_read_handler(
2292                         conn, conn->smb1.echo_handler.trusted_fd);
2293                 return;
2294         }
2295 }
2296
2297 #ifdef CLUSTER_SUPPORT
2298 /****************************************************************************
2299 received when we should release a specific IP
2300 ****************************************************************************/
2301 static void release_ip(const char *ip, void *priv)
2302 {
2303         const char *addr = (const char *)priv;
2304         const char *p = addr;
2305
2306         if (strncmp("::ffff:", addr, 7) == 0) {
2307                 p = addr + 7;
2308         }
2309
2310         DEBUG(10, ("Got release IP message for %s, "
2311                    "our address is %s\n", ip, p));
2312
2313         if ((strcmp(p, ip) == 0) || ((p != addr) && strcmp(addr, ip) == 0)) {
2314                 /* we can't afford to do a clean exit - that involves
2315                    database writes, which would potentially mean we
2316                    are still running after the failover has finished -
2317                    we have to get rid of this process ID straight
2318                    away */
2319                 DEBUG(0,("Got release IP message for our IP %s - exiting immediately\n",
2320                         ip));
2321                 /* note we must exit with non-zero status so the unclean handler gets
2322                    called in the parent, so that the brl database is tickled */
2323                 _exit(1);
2324         }
2325 }
2326
2327 static int client_get_tcp_info(int sock, struct sockaddr_storage *server,
2328                                struct sockaddr_storage *client)
2329 {
2330         socklen_t length;
2331         length = sizeof(*server);
2332         if (getsockname(sock, (struct sockaddr *)server, &length) != 0) {
2333                 return -1;
2334         }
2335         length = sizeof(*client);
2336         if (getpeername(sock, (struct sockaddr *)client, &length) != 0) {
2337                 return -1;
2338         }
2339         return 0;
2340 }
2341 #endif
2342
2343 /*
2344  * Send keepalive packets to our client
2345  */
2346 static bool keepalive_fn(const struct timeval *now, void *private_data)
2347 {
2348         struct smbd_server_connection *sconn = smbd_server_conn;
2349         bool ret;
2350
2351         if (sconn->using_smb2) {
2352                 /* Don't do keepalives on an SMB2 connection. */
2353                 return false;
2354         }
2355
2356         smbd_lock_socket(smbd_server_conn);
2357         ret = send_keepalive(sconn->sock);
2358         smbd_unlock_socket(smbd_server_conn);
2359
2360         if (!ret) {
2361                 char addr[INET6_ADDRSTRLEN];
2362                 /*
2363                  * Try and give an error message saying what
2364                  * client failed.
2365                  */
2366                 DEBUG(0, ("send_keepalive failed for client %s. "
2367                           "Error %s - exiting\n",
2368                           get_peer_addr(sconn->sock, addr, sizeof(addr)),
2369                           strerror(errno)));
2370                 return False;
2371         }
2372         return True;
2373 }
2374
2375 /*
2376  * Do the recurring check if we're idle
2377  */
2378 static bool deadtime_fn(const struct timeval *now, void *private_data)
2379 {
2380         struct smbd_server_connection *sconn =
2381                 (struct smbd_server_connection *)private_data;
2382
2383         if ((conn_num_open(sconn) == 0)
2384             || (conn_idle_all(sconn, now->tv_sec))) {
2385                 DEBUG( 2, ( "Closing idle connection\n" ) );
2386                 messaging_send(sconn->msg_ctx,
2387                                messaging_server_id(sconn->msg_ctx),
2388                                MSG_SHUTDOWN, &data_blob_null);
2389                 return False;
2390         }
2391
2392         return True;
2393 }
2394
2395 /*
2396  * Do the recurring log file and smb.conf reload checks.
2397  */
2398
2399 static bool housekeeping_fn(const struct timeval *now, void *private_data)
2400 {
2401         struct smbd_server_connection *sconn = talloc_get_type_abort(
2402                 private_data, struct smbd_server_connection);
2403
2404         DEBUG(5, ("housekeeping\n"));
2405
2406         change_to_root_user();
2407
2408         /* update printer queue caches if necessary */
2409         update_monitored_printq_cache(sconn->msg_ctx);
2410
2411         /* check if we need to reload services */
2412         check_reload(sconn, time_mono(NULL));
2413
2414         /* Change machine password if neccessary. */
2415         attempt_machine_password_change();
2416
2417         /*
2418          * Force a log file check.
2419          */
2420         force_check_log_size();
2421         check_log_size();
2422         return true;
2423 }
2424
2425 /*
2426  * Read an smb packet in the echo handler child, giving the parent
2427  * smbd one second to react once the socket becomes readable.
2428  */
2429
2430 struct smbd_echo_read_state {
2431         struct tevent_context *ev;
2432         struct smbd_server_connection *sconn;
2433
2434         char *buf;
2435         size_t buflen;
2436         uint32_t seqnum;
2437 };
2438
2439 static void smbd_echo_read_readable(struct tevent_req *subreq);
2440 static void smbd_echo_read_waited(struct tevent_req *subreq);
2441
2442 static struct tevent_req *smbd_echo_read_send(
2443         TALLOC_CTX *mem_ctx, struct tevent_context *ev,
2444         struct smbd_server_connection *sconn)
2445 {
2446         struct tevent_req *req, *subreq;
2447         struct smbd_echo_read_state *state;
2448
2449         req = tevent_req_create(mem_ctx, &state,
2450                                 struct smbd_echo_read_state);
2451         if (req == NULL) {
2452                 return NULL;
2453         }
2454         state->ev = ev;
2455         state->sconn = sconn;
2456
2457         subreq = wait_for_read_send(state, ev, sconn->sock);
2458         if (tevent_req_nomem(subreq, req)) {
2459                 return tevent_req_post(req, ev);
2460         }
2461         tevent_req_set_callback(subreq, smbd_echo_read_readable, req);
2462         return req;
2463 }
2464
2465 static void smbd_echo_read_readable(struct tevent_req *subreq)
2466 {
2467         struct tevent_req *req = tevent_req_callback_data(
2468                 subreq, struct tevent_req);
2469         struct smbd_echo_read_state *state = tevent_req_data(
2470                 req, struct smbd_echo_read_state);
2471         bool ok;
2472         int err;
2473
2474         ok = wait_for_read_recv(subreq, &err);
2475         TALLOC_FREE(subreq);
2476         if (!ok) {
2477                 tevent_req_nterror(req, map_nt_error_from_unix(err));
2478                 return;
2479         }
2480
2481         /*
2482          * Give the parent smbd one second to step in
2483          */
2484
2485         subreq = tevent_wakeup_send(
2486                 state, state->ev, timeval_current_ofs(1, 0));
2487         if (tevent_req_nomem(subreq, req)) {
2488                 return;
2489         }
2490         tevent_req_set_callback(subreq, smbd_echo_read_waited, req);
2491 }
2492
2493 static void smbd_echo_read_waited(struct tevent_req *subreq)
2494 {
2495         struct tevent_req *req = tevent_req_callback_data(
2496                 subreq, struct tevent_req);
2497         struct smbd_echo_read_state *state = tevent_req_data(
2498                 req, struct smbd_echo_read_state);
2499         struct smbd_server_connection *sconn = state->sconn;
2500         bool ok;
2501         NTSTATUS status;
2502         size_t unread = 0;
2503         bool encrypted;
2504
2505         ok = tevent_wakeup_recv(subreq);
2506         TALLOC_FREE(subreq);
2507         if (!ok) {
2508                 tevent_req_nterror(req, NT_STATUS_INTERNAL_ERROR);
2509                 return;
2510         }
2511
2512         ok = smbd_lock_socket_internal(sconn);
2513         if (!ok) {
2514                 tevent_req_nterror(req, map_nt_error_from_unix(errno));
2515                 DEBUG(0, ("%s: failed to lock socket\n", __location__));
2516                 return;
2517         }
2518
2519         if (!fd_is_readable(sconn->sock)) {
2520                 DEBUG(10,("echo_handler[%d] the parent smbd was faster\n",
2521                           (int)sys_getpid()));
2522
2523                 ok = smbd_unlock_socket_internal(sconn);
2524                 if (!ok) {
2525                         tevent_req_nterror(req, map_nt_error_from_unix(errno));
2526                         DEBUG(1, ("%s: failed to unlock socket\n",
2527                                 __location__));
2528                         return;
2529                 }
2530
2531                 subreq = wait_for_read_send(state, state->ev, sconn->sock);
2532                 if (tevent_req_nomem(subreq, req)) {
2533                         return;
2534                 }
2535                 tevent_req_set_callback(subreq, smbd_echo_read_readable, req);
2536                 return;
2537         }
2538
2539         status = receive_smb_talloc(state, sconn, sconn->sock, &state->buf,
2540                                     0 /* timeout */,
2541                                     &unread,
2542                                     &encrypted,
2543                                     &state->buflen,
2544                                     &state->seqnum,
2545                                     false /* trusted_channel*/);
2546
2547         if (tevent_req_nterror(req, status)) {
2548                 tevent_req_nterror(req, status);
2549                 DEBUG(1, ("echo_handler[%d]: receive_smb_raw_talloc failed: %s\n",
2550                           (int)sys_getpid(), nt_errstr(status)));
2551                 return;
2552         }
2553
2554         ok = smbd_unlock_socket_internal(sconn);
2555         if (!ok) {
2556                 tevent_req_nterror(req, map_nt_error_from_unix(errno));
2557                 DEBUG(1, ("%s: failed to unlock socket\n", __location__));
2558                 return;
2559         }
2560         tevent_req_done(req);
2561 }
2562
2563 static NTSTATUS smbd_echo_read_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
2564                                     char **pbuf, size_t *pbuflen, uint32_t *pseqnum)
2565 {
2566         struct smbd_echo_read_state *state = tevent_req_data(
2567                 req, struct smbd_echo_read_state);
2568         NTSTATUS status;
2569
2570         if (tevent_req_is_nterror(req, &status)) {
2571                 return status;
2572         }
2573         *pbuf = talloc_move(mem_ctx, &state->buf);
2574         *pbuflen = state->buflen;
2575         *pseqnum = state->seqnum;
2576         return NT_STATUS_OK;
2577 }
2578
2579 struct smbd_echo_state {
2580         struct tevent_context *ev;
2581         struct iovec *pending;
2582         struct smbd_server_connection *sconn;
2583         int parent_pipe;
2584
2585         struct tevent_fd *parent_fde;
2586
2587         struct tevent_req *write_req;
2588 };
2589
2590 static void smbd_echo_writer_done(struct tevent_req *req);
2591
2592 static void smbd_echo_activate_writer(struct smbd_echo_state *state)
2593 {
2594         int num_pending;
2595
2596         if (state->write_req != NULL) {
2597                 return;
2598         }
2599
2600         num_pending = talloc_array_length(state->pending);
2601         if (num_pending == 0) {
2602                 return;
2603         }
2604
2605         state->write_req = writev_send(state, state->ev, NULL,
2606                                        state->parent_pipe, false,
2607                                        state->pending, num_pending);
2608         if (state->write_req == NULL) {
2609                 DEBUG(1, ("writev_send failed\n"));
2610                 exit(1);
2611         }
2612
2613         talloc_steal(state->write_req, state->pending);
2614         state->pending = NULL;
2615
2616         tevent_req_set_callback(state->write_req, smbd_echo_writer_done,
2617                                 state);
2618 }
2619
2620 static void smbd_echo_writer_done(struct tevent_req *req)
2621 {
2622         struct smbd_echo_state *state = tevent_req_callback_data(
2623                 req, struct smbd_echo_state);
2624         ssize_t written;
2625         int err;
2626
2627         written = writev_recv(req, &err);
2628         TALLOC_FREE(req);
2629         state->write_req = NULL;
2630         if (written == -1) {
2631                 DEBUG(1, ("writev to parent failed: %s\n", strerror(err)));
2632                 exit(1);
2633         }
2634         DEBUG(10,("echo_handler[%d]: forwarded pdu to main\n", (int)sys_getpid()));
2635         smbd_echo_activate_writer(state);
2636 }
2637
2638 static bool smbd_echo_reply(uint8_t *inbuf, size_t inbuf_len,
2639                             uint32_t seqnum)
2640 {
2641         struct smb_request req;
2642         uint16_t num_replies;
2643         size_t out_len;
2644         char *outbuf;
2645         bool ok;
2646
2647         if ((inbuf_len == 4) && (CVAL(inbuf, 0) == NBSSkeepalive)) {
2648                 DEBUG(10, ("Got netbios keepalive\n"));
2649                 /*
2650                  * Just swallow it
2651                  */
2652                 return true;
2653         }
2654
2655         if (inbuf_len < smb_size) {
2656                 DEBUG(10, ("Got short packet: %d bytes\n", (int)inbuf_len));
2657                 return false;
2658         }
2659         if (!valid_smb_header(inbuf)) {
2660                 DEBUG(10, ("Got invalid SMB header\n"));
2661                 return false;
2662         }
2663
2664         if (!init_smb_request(&req, smbd_server_conn, inbuf, 0, false,
2665                               seqnum)) {
2666                 return false;
2667         }
2668         req.inbuf = inbuf;
2669
2670         DEBUG(10, ("smbecho handler got cmd %d (%s)\n", (int)req.cmd,
2671                    smb_messages[req.cmd].name
2672                    ? smb_messages[req.cmd].name : "unknown"));
2673
2674         if (req.cmd != SMBecho) {
2675                 return false;
2676         }
2677         if (req.wct < 1) {
2678                 return false;
2679         }
2680
2681         num_replies = SVAL(req.vwv+0, 0);
2682         if (num_replies != 1) {
2683                 /* Not a Windows "Hey, you're still there?" request */
2684                 return false;
2685         }
2686
2687         if (!create_outbuf(talloc_tos(), &req, (const char *)req.inbuf, &outbuf,
2688                            1, req.buflen)) {
2689                 DEBUG(10, ("create_outbuf failed\n"));
2690                 return false;
2691         }
2692         req.outbuf = (uint8_t *)outbuf;
2693
2694         SSVAL(req.outbuf, smb_vwv0, num_replies);
2695
2696         if (req.buflen > 0) {
2697                 memcpy(smb_buf(req.outbuf), req.buf, req.buflen);
2698         }
2699
2700         out_len = smb_len(req.outbuf) + 4;
2701
2702         ok = srv_send_smb(req.sconn,
2703                           (char *)outbuf,
2704                           true, seqnum+1,
2705                           false, &req.pcd);
2706         TALLOC_FREE(outbuf);
2707         if (!ok) {
2708                 exit(1);
2709         }
2710
2711         return true;
2712 }
2713
2714 static void smbd_echo_exit(struct tevent_context *ev,
2715                            struct tevent_fd *fde, uint16_t flags,
2716                            void *private_data)
2717 {
2718         DEBUG(2, ("smbd_echo_exit: lost connection to parent\n"));
2719         exit(0);
2720 }
2721
2722 static void smbd_echo_got_packet(struct tevent_req *req);
2723
2724 static void smbd_echo_loop(struct smbd_server_connection *sconn,
2725                            int parent_pipe)
2726 {
2727         struct smbd_echo_state *state;
2728         struct tevent_req *read_req;
2729
2730         state = talloc_zero(sconn, struct smbd_echo_state);
2731         if (state == NULL) {
2732                 DEBUG(1, ("talloc failed\n"));
2733                 return;
2734         }
2735         state->sconn = sconn;
2736         state->parent_pipe = parent_pipe;
2737         state->ev = s3_tevent_context_init(state);
2738         if (state->ev == NULL) {
2739                 DEBUG(1, ("tevent_context_init failed\n"));
2740                 TALLOC_FREE(state);
2741                 return;
2742         }
2743         state->parent_fde = tevent_add_fd(state->ev, state, parent_pipe,
2744                                         TEVENT_FD_READ, smbd_echo_exit,
2745                                         state);
2746         if (state->parent_fde == NULL) {
2747                 DEBUG(1, ("tevent_add_fd failed\n"));
2748                 TALLOC_FREE(state);
2749                 return;
2750         }
2751
2752         read_req = smbd_echo_read_send(state, state->ev, sconn);
2753         if (read_req == NULL) {
2754                 DEBUG(1, ("smbd_echo_read_send failed\n"));
2755                 TALLOC_FREE(state);
2756                 return;
2757         }
2758         tevent_req_set_callback(read_req, smbd_echo_got_packet, state);
2759
2760         while (true) {
2761                 if (tevent_loop_once(state->ev) == -1) {
2762                         DEBUG(1, ("tevent_loop_once failed: %s\n",
2763                                   strerror(errno)));
2764                         break;
2765                 }
2766         }
2767         TALLOC_FREE(state);
2768 }
2769
2770 static void smbd_echo_got_packet(struct tevent_req *req)
2771 {
2772         struct smbd_echo_state *state = tevent_req_callback_data(
2773                 req, struct smbd_echo_state);
2774         NTSTATUS status;
2775         char *buf = NULL;
2776         size_t buflen = 0;
2777         uint32_t seqnum = 0;
2778         bool reply;
2779
2780         status = smbd_echo_read_recv(req, state, &buf, &buflen, &seqnum);
2781         TALLOC_FREE(req);
2782         if (!NT_STATUS_IS_OK(status)) {
2783                 DEBUG(1, ("smbd_echo_read_recv returned %s\n",
2784                           nt_errstr(status)));
2785                 exit(1);
2786         }
2787
2788         reply = smbd_echo_reply((uint8_t *)buf, buflen, seqnum);
2789         if (!reply) {
2790                 size_t num_pending;
2791                 struct iovec *tmp;
2792                 struct iovec *iov;
2793
2794                 num_pending = talloc_array_length(state->pending);
2795                 tmp = talloc_realloc(state, state->pending, struct iovec,
2796                                      num_pending+1);
2797                 if (tmp == NULL) {
2798                         DEBUG(1, ("talloc_realloc failed\n"));
2799                         exit(1);
2800                 }
2801                 state->pending = tmp;
2802
2803                 if (buflen >= smb_size) {
2804                         /*
2805                          * place the seqnum in the packet so that the main process
2806                          * can reply with signing
2807                          */
2808                         SIVAL(buf, smb_ss_field, seqnum);
2809                         SIVAL(buf, smb_ss_field+4, NT_STATUS_V(NT_STATUS_OK));
2810                 }
2811
2812                 iov = &state->pending[num_pending];
2813                 iov->iov_base = buf;
2814                 iov->iov_len = buflen;
2815
2816                 DEBUG(10,("echo_handler[%d]: forward to main\n",
2817                           (int)sys_getpid()));
2818                 smbd_echo_activate_writer(state);
2819         }
2820
2821         req = smbd_echo_read_send(state, state->ev, state->sconn);
2822         if (req == NULL) {
2823                 DEBUG(1, ("smbd_echo_read_send failed\n"));
2824                 exit(1);
2825         }
2826         tevent_req_set_callback(req, smbd_echo_got_packet, state);
2827 }
2828
2829
2830 /*
2831  * Handle SMBecho requests in a forked child process
2832  */
2833 bool fork_echo_handler(struct smbd_server_connection *sconn)
2834 {
2835         int listener_pipe[2];
2836         int res;
2837         pid_t child;
2838
2839         res = pipe(listener_pipe);
2840         if (res == -1) {
2841                 DEBUG(1, ("pipe() failed: %s\n", strerror(errno)));
2842                 return false;
2843         }
2844         sconn->smb1.echo_handler.socket_lock_fd = create_unlink_tmp(lp_lockdir());
2845         if (sconn->smb1.echo_handler.socket_lock_fd == -1) {
2846                 DEBUG(1, ("Could not create lock fd: %s\n", strerror(errno)));
2847                 goto fail;
2848         }
2849
2850         child = sys_fork();
2851         if (child == 0) {
2852                 NTSTATUS status;
2853
2854                 close(listener_pipe[0]);
2855                 set_blocking(listener_pipe[1], false);
2856
2857                 status = reinit_after_fork(sconn->msg_ctx,
2858                                            server_event_context(),
2859                                            procid_self(), false);
2860                 if (!NT_STATUS_IS_OK(status)) {
2861                         DEBUG(1, ("reinit_after_fork failed: %s\n",
2862                                   nt_errstr(status)));
2863                         exit(1);
2864                 }
2865                 smbd_echo_loop(sconn, listener_pipe[1]);
2866                 exit(0);
2867         }
2868         close(listener_pipe[1]);
2869         listener_pipe[1] = -1;
2870         sconn->smb1.echo_handler.trusted_fd = listener_pipe[0];
2871
2872         DEBUG(10,("fork_echo_handler: main[%d] echo_child[%d]\n", (int)sys_getpid(), child));
2873
2874         /*
2875          * Without smb signing this is the same as the normal smbd
2876          * listener. This needs to change once signing comes in.
2877          */
2878         sconn->smb1.echo_handler.trusted_fde = event_add_fd(server_event_context(),
2879                                         sconn,
2880                                         sconn->smb1.echo_handler.trusted_fd,
2881                                         EVENT_FD_READ,
2882                                         smbd_server_echo_handler,
2883                                         sconn);
2884         if (sconn->smb1.echo_handler.trusted_fde == NULL) {
2885                 DEBUG(1, ("event_add_fd failed\n"));
2886                 goto fail;
2887         }
2888
2889         return true;
2890
2891 fail:
2892         if (listener_pipe[0] != -1) {
2893                 close(listener_pipe[0]);
2894         }
2895         if (listener_pipe[1] != -1) {
2896                 close(listener_pipe[1]);
2897         }
2898         sconn->smb1.echo_handler.trusted_fd = -1;
2899         if (sconn->smb1.echo_handler.socket_lock_fd != -1) {
2900                 close(sconn->smb1.echo_handler.socket_lock_fd);
2901         }
2902         sconn->smb1.echo_handler.trusted_fd = -1;
2903         sconn->smb1.echo_handler.socket_lock_fd = -1;
2904         return false;
2905 }
2906
2907 #if CLUSTER_SUPPORT
2908
2909 static NTSTATUS smbd_register_ips(struct smbd_server_connection *sconn,
2910                                   struct sockaddr_storage *srv,
2911                                   struct sockaddr_storage *clnt)
2912 {
2913         struct ctdbd_connection *cconn;
2914         char tmp_addr[INET6_ADDRSTRLEN];
2915         char *addr;
2916
2917         cconn = messaging_ctdbd_connection();
2918         if (cconn == NULL) {
2919                 return NT_STATUS_NO_MEMORY;
2920         }
2921
2922         client_socket_addr(sconn->sock, tmp_addr, sizeof(tmp_addr));
2923         addr = talloc_strdup(cconn, tmp_addr);
2924         if (addr == NULL) {
2925                 return NT_STATUS_NO_MEMORY;
2926         }
2927         return ctdbd_register_ips(cconn, srv, clnt, release_ip, addr);
2928 }
2929
2930 #endif
2931
2932 /****************************************************************************
2933  Process commands from the client
2934 ****************************************************************************/
2935
2936 void smbd_process(struct tevent_context *ev_ctx,
2937                   struct smbd_server_connection *sconn)
2938 {
2939         TALLOC_CTX *frame = talloc_stackframe();
2940         struct sockaddr_storage ss;
2941         struct sockaddr *sa = NULL;
2942         socklen_t sa_socklen;
2943         struct tsocket_address *local_address = NULL;
2944         struct tsocket_address *remote_address = NULL;
2945         const char *remaddr = NULL;
2946         char *rhost;
2947         int ret;
2948
2949         if (lp_maxprotocol() >= PROTOCOL_SMB2_02) {
2950                 /*
2951                  * We're not making the decision here,
2952                  * we're just allowing the client
2953                  * to decide between SMB1 and SMB2
2954                  * with the first negprot
2955                  * packet.
2956                  */
2957                 sconn->using_smb2 = true;
2958         }
2959
2960         /* Ensure child is set to blocking mode */
2961         set_blocking(sconn->sock,True);
2962
2963         set_socket_options(sconn->sock, "SO_KEEPALIVE");
2964         set_socket_options(sconn->sock, lp_socket_options());
2965
2966         sa = (struct sockaddr *)(void *)&ss;
2967         sa_socklen = sizeof(ss);
2968         ret = getpeername(sconn->sock, sa, &sa_socklen);
2969         if (ret != 0) {
2970                 int level = (errno == ENOTCONN)?2:0;
2971                 DEBUG(level,("getpeername() failed - %s\n", strerror(errno)));
2972                 exit_server_cleanly("getpeername() failed.\n");
2973         }
2974         ret = tsocket_address_bsd_from_sockaddr(sconn,
2975                                                 sa, sa_socklen,
2976                                                 &remote_address);
2977         if (ret != 0) {
2978                 DEBUG(0,("%s: tsocket_address_bsd_from_sockaddr remote failed - %s\n",
2979                         __location__, strerror(errno)));
2980                 exit_server_cleanly("tsocket_address_bsd_from_sockaddr remote failed.\n");
2981         }
2982
2983         sa = (struct sockaddr *)(void *)&ss;
2984         sa_socklen = sizeof(ss);
2985         ret = getsockname(sconn->sock, sa, &sa_socklen);
2986         if (ret != 0) {
2987                 int level = (errno == ENOTCONN)?2:0;
2988                 DEBUG(level,("getsockname() failed - %s\n", strerror(errno)));
2989                 exit_server_cleanly("getsockname() failed.\n");
2990         }
2991         ret = tsocket_address_bsd_from_sockaddr(sconn,
2992                                                 sa, sa_socklen,
2993                                                 &local_address);
2994         if (ret != 0) {
2995                 DEBUG(0,("%s: tsocket_address_bsd_from_sockaddr remote failed - %s\n",
2996                         __location__, strerror(errno)));
2997                 exit_server_cleanly("tsocket_address_bsd_from_sockaddr remote failed.\n");
2998         }
2999
3000         sconn->local_address = local_address;
3001         sconn->remote_address = remote_address;
3002
3003         if (tsocket_address_is_inet(remote_address, "ip")) {
3004                 remaddr = tsocket_address_inet_addr_string(
3005                                 sconn->remote_address,
3006                                 talloc_tos());
3007                 if (remaddr == NULL) {
3008                         DEBUG(0,("%s: tsocket_address_inet_addr_string remote failed - %s\n",
3009                                  __location__, strerror(errno)));
3010                         exit_server_cleanly("tsocket_address_inet_addr_string remote failed.\n");
3011                 }
3012         } else {
3013                 remaddr = "0.0.0.0";
3014         }
3015
3016         /* this is needed so that we get decent entries
3017            in smbstatus for port 445 connects */
3018         set_remote_machine_name(remaddr, false);
3019         reload_services(sconn->msg_ctx, sconn->sock, true);
3020
3021         /*
3022          * Before the first packet, check the global hosts allow/ hosts deny
3023          * parameters before doing any parsing of packets passed to us by the
3024          * client. This prevents attacks on our parsing code from hosts not in
3025          * the hosts allow list.
3026          */
3027
3028         ret = get_remote_hostname(remote_address,
3029                                   &rhost,
3030                                   talloc_tos());
3031         if (ret < 0) {
3032                 DEBUG(0,("%s: get_remote_hostname failed - %s\n",
3033                         __location__, strerror(errno)));
3034                 exit_server_cleanly("get_remote_hostname failed.\n");
3035         }
3036         if (strequal(rhost, "UNKNOWN")) {
3037                 rhost = talloc_strdup(talloc_tos(), remaddr);
3038         }
3039         sconn->remote_hostname = talloc_move(sconn, &rhost);
3040
3041         if (!allow_access(lp_hostsdeny(-1), lp_hostsallow(-1),
3042                           sconn->remote_hostname,
3043                           remaddr)) {
3044                 /*
3045                  * send a negative session response "not listening on calling
3046                  * name"
3047                  */
3048                 unsigned char buf[5] = {0x83, 0, 0, 1, 0x81};
3049                 DEBUG( 1, ("Connection denied from %s to %s\n",
3050                            tsocket_address_string(remote_address, talloc_tos()),
3051                            tsocket_address_string(local_address, talloc_tos())));
3052                 (void)srv_send_smb(sconn,(char *)buf, false,
3053                                    0, false, NULL);
3054                 exit_server_cleanly("connection denied");
3055         }
3056
3057         DEBUG(10, ("Connection allowed from %s to %s\n",
3058                    tsocket_address_string(remote_address, talloc_tos()),
3059                    tsocket_address_string(local_address, talloc_tos())));
3060
3061         init_modules();
3062
3063         smb_perfcount_init();
3064
3065         if (!init_account_policy()) {
3066                 exit_server("Could not open account policy tdb.\n");
3067         }
3068
3069         if (*lp_rootdir()) {
3070                 if (chroot(lp_rootdir()) != 0) {
3071                         DEBUG(0,("Failed to change root to %s\n", lp_rootdir()));
3072                         exit_server("Failed to chroot()");
3073                 }
3074                 if (chdir("/") == -1) {
3075                         DEBUG(0,("Failed to chdir to / on chroot to %s\n", lp_rootdir()));
3076                         exit_server("Failed to chroot()");
3077                 }
3078                 DEBUG(0,("Changed root to %s\n", lp_rootdir()));
3079         }
3080
3081         if (!srv_init_signing(sconn)) {
3082                 exit_server("Failed to init smb_signing");
3083         }
3084
3085         /* Setup oplocks */
3086         if (!init_oplocks(sconn->msg_ctx))
3087                 exit_server("Failed to init oplocks");
3088
3089         /* register our message handlers */
3090         messaging_register(sconn->msg_ctx, NULL,
3091                            MSG_SMB_FORCE_TDIS, msg_force_tdis);
3092         messaging_register(sconn->msg_ctx, NULL,
3093                            MSG_SMB_CLOSE_FILE, msg_close_file);
3094
3095         /*
3096          * Use the default MSG_DEBUG handler to avoid rebroadcasting
3097          * MSGs to all child processes
3098          */
3099         messaging_deregister(sconn->msg_ctx,
3100                              MSG_DEBUG, NULL);
3101         messaging_register(sconn->msg_ctx, NULL,
3102                            MSG_DEBUG, debug_message);
3103
3104         if ((lp_keepalive() != 0)
3105             && !(event_add_idle(ev_ctx, NULL,
3106                                 timeval_set(lp_keepalive(), 0),
3107                                 "keepalive", keepalive_fn,
3108                                 NULL))) {
3109                 DEBUG(0, ("Could not add keepalive event\n"));
3110                 exit(1);
3111         }
3112
3113         if (!(event_add_idle(ev_ctx, NULL,
3114                              timeval_set(IDLE_CLOSED_TIMEOUT, 0),
3115                              "deadtime", deadtime_fn, sconn))) {
3116                 DEBUG(0, ("Could not add deadtime event\n"));
3117                 exit(1);
3118         }
3119
3120         if (!(event_add_idle(ev_ctx, NULL,
3121                              timeval_set(SMBD_HOUSEKEEPING_INTERVAL, 0),
3122                              "housekeeping", housekeeping_fn, sconn))) {
3123                 DEBUG(0, ("Could not add housekeeping event\n"));
3124                 exit(1);
3125         }
3126
3127 #ifdef CLUSTER_SUPPORT
3128
3129         if (lp_clustering()) {
3130                 /*
3131                  * We need to tell ctdb about our client's TCP
3132                  * connection, so that for failover ctdbd can send
3133                  * tickle acks, triggering a reconnection by the
3134                  * client.
3135                  */
3136
3137                 struct sockaddr_storage srv, clnt;
3138
3139                 if (client_get_tcp_info(sconn->sock, &srv, &clnt) == 0) {
3140                         NTSTATUS status;
3141                         status = smbd_register_ips(sconn, &srv, &clnt);
3142                         if (!NT_STATUS_IS_OK(status)) {
3143                                 DEBUG(0, ("ctdbd_register_ips failed: %s\n",
3144                                           nt_errstr(status)));
3145                         }
3146                 } else
3147                 {
3148                         DEBUG(0,("Unable to get tcp info for "
3149                                  "CTDB_CONTROL_TCP_CLIENT: %s\n",
3150                                  strerror(errno)));
3151                 }
3152         }
3153
3154 #endif
3155
3156         sconn->nbt.got_session = false;
3157
3158         sconn->smb1.negprot.max_recv = MIN(lp_maxxmit(),BUFFER_SIZE);
3159
3160         sconn->smb1.sessions.done_sesssetup = false;
3161         sconn->smb1.sessions.max_send = BUFFER_SIZE;
3162         sconn->smb1.sessions.last_session_tag = UID_FIELD_INVALID;
3163         /* users from session setup */
3164         sconn->smb1.sessions.session_userlist = NULL;
3165         /* workgroup from session setup. */
3166         sconn->smb1.sessions.session_workgroup = NULL;
3167         /* this holds info on user ids that are already validated for this VC */
3168         sconn->smb1.sessions.validated_users = NULL;
3169         sconn->smb1.sessions.next_vuid = VUID_OFFSET;
3170         sconn->smb1.sessions.num_validated_vuids = 0;
3171
3172         conn_init(sconn);
3173         if (!init_dptrs(sconn)) {
3174                 exit_server("init_dptrs() failed");
3175         }
3176
3177         sconn->smb1.fde = event_add_fd(ev_ctx,
3178                                                   sconn,
3179                                                   sconn->sock,
3180                                                   EVENT_FD_READ,
3181                                                   smbd_server_connection_handler,
3182                                                   sconn);
3183         if (!sconn->smb1.fde) {
3184                 exit_server("failed to create smbd_server_connection fde");
3185         }
3186
3187         TALLOC_FREE(frame);
3188
3189         while (True) {
3190                 NTSTATUS status;
3191
3192                 frame = talloc_stackframe_pool(8192);
3193
3194                 errno = 0;
3195
3196                 status = smbd_server_connection_loop_once(ev_ctx, sconn);
3197                 if (!NT_STATUS_EQUAL(status, NT_STATUS_RETRY) &&
3198                     !NT_STATUS_IS_OK(status)) {
3199                         DEBUG(3, ("smbd_server_connection_loop_once failed: %s,"
3200                                   " exiting\n", nt_errstr(status)));
3201                         break;
3202                 }
3203
3204                 TALLOC_FREE(frame);
3205         }
3206
3207         exit_server_cleanly(NULL);
3208 }
3209
3210 bool req_is_in_chain(struct smb_request *req)
3211 {
3212         if (req->vwv != (const uint16_t *)(req->inbuf+smb_vwv)) {
3213                 /*
3214                  * We're right now handling a subsequent request, so we must
3215                  * be in a chain
3216                  */
3217                 return true;
3218         }
3219
3220         if (!is_andx_req(req->cmd)) {
3221                 return false;
3222         }
3223
3224         if (req->wct < 2) {
3225                 /*
3226                  * Okay, an illegal request, but definitely not chained :-)
3227                  */
3228                 return false;
3229         }
3230
3231         return (CVAL(req->vwv+0, 0) != 0xFF);
3232 }