source3/modules/vfs_snapper.c

   1 /*
   2  * Module for snapshot IO using snapper
   3  *
   4  * Copyright (C) David Disseldorp 2012-2014
   5  *
   6  * Portions taken from vfs_shadow_copy2.c:
   7  * Copyright (C) Andrew Tridgell   2007
   8  * Copyright (C) Ed Plese          2009
   9  * Copyright (C) Volker Lendecke   2011
  10  * Copyright (C) Christian Ambach  2011
  11  * Copyright (C) Michael Adam      2013
  12  *
  13  * This program is free software; you can redistribute it and/or modify
  14  * it under the terms of the GNU General Public License as published by
  15  * the Free Software Foundation; either version 3 of the License, or
  16  * (at your option) any later version.
  17  *
  18  * This program is distributed in the hope that it will be useful,
  19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  * GNU General Public License for more details.
  22  *
  23  * You should have received a copy of the GNU General Public License
  24  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  25  */
  26
  27 #include <dbus/dbus.h>
  28 #ifdef HAVE_LINUX_IOCTL_H
  29 #include <linux/ioctl.h>
  30 #endif
  31 #include <sys/ioctl.h>
  32 #include <dirent.h>
  33 #include <libgen.h>
  34 #include "includes.h"
  35 #include "include/ntioctl.h"
  36 #include "include/smb.h"
  37 #include "system/filesys.h"
  38 #include "smbd/smbd.h"
  39 #include "lib/util/tevent_ntstatus.h"
  40
  41 #define SNAPPER_SIG_LIST_SNAPS_RSP "a(uquxussa{ss})"
  42 #define SNAPPER_SIG_LIST_CONFS_RSP "a(ssa{ss})"
  43 #define SNAPPER_SIG_CREATE_SNAP_RSP "u"
  44 #define SNAPPER_SIG_DEL_SNAPS_RSP ""
  45 #define SNAPPER_SIG_STRING_DICT "{ss}"
  46
  47 struct snapper_dict {
  48         char *key;
  49         char *val;
  50 };
  51
  52 struct snapper_snap {
  53         uint32_t id;
  54         uint16_t type;
  55         uint32_t pre_id;
  56         int64_t time;
  57         uint32_t creator_uid;
  58         char *desc;
  59         char *cleanup;
  60         uint32_t num_user_data;
  61         struct snapper_dict *user_data;
  62 };
  63
  64 struct snapper_conf {
  65         char *name;
  66         char *mnt;
  67         uint32_t num_attrs;
  68         struct snapper_dict *attrs;
  69 };
  70
  71 static const struct {
  72         const char *snapper_err_str;
  73         NTSTATUS status;
  74 } snapper_err_map[] = {
  75         { "error.no_permissions", NT_STATUS_ACCESS_DENIED },
  76 };
  77
  78 static NTSTATUS snapper_err_ntstatus_map(const char *snapper_err_str)
  79 {
  80         int i;
  81
  82         if (snapper_err_str == NULL) {
  83                 return NT_STATUS_UNSUCCESSFUL;
  84         }
  85         for (i = 0; i < ARRAY_SIZE(snapper_err_map); i++) {
  86                 if (!strcmp(snapper_err_map[i].snapper_err_str,
  87                             snapper_err_str)) {
  88                         return snapper_err_map[i].status;
  89                 }
  90         }
  91         DEBUG(2, ("no explicit mapping for dbus error: %s\n", snapper_err_str));
  92
  93         return NT_STATUS_UNSUCCESSFUL;
  94 }
  95
  96 /*
  97  * Strings are UTF-8. Other characters must be encoded hexadecimal as "\x??".
  98  * As a consequence "\" must be encoded as "\\".
  99  */
 100 static NTSTATUS snapper_dbus_str_encode(TALLOC_CTX *mem_ctx, const char *in_str,
 101                                         char **_out_str)
 102 {
 103         size_t in_len;
 104         char *out_str;
 105         int i;
 106         int out_off;
 107         int out_len;
 108
 109         if (in_str == NULL) {
 110                 return NT_STATUS_INVALID_PARAMETER;
 111         }
 112
 113         in_len = strlen(in_str);
 114
 115         /* output can be max 4 times the length of @in_str, +1 for terminator */
 116         out_len = (in_len * 4) + 1;
 117
 118         out_str = talloc_array(mem_ctx, char, out_len);
 119         if (out_str == NULL) {
 120                 return NT_STATUS_NO_MEMORY;
 121         }
 122
 123         out_off = 0;
 124         for (i = 0; i < in_len; i++) {
 125                 size_t pushed;
 126
 127                 if (in_str[i] == '\\') {
 128                         pushed = snprintf(out_str + out_off, out_len - out_off,
 129                                           "\\\\");
 130                 } else if ((unsigned char)in_str[i] > 127) {
 131                         pushed = snprintf(out_str + out_off, out_len - out_off,
 132                                           "\\x%02x", (unsigned char)in_str[i]);
 133                 } else {
 134                         /* regular character */
 135                         *(out_str + out_off) = in_str[i];
 136                         pushed = sizeof(char);
 137                 }
 138                 if (pushed >= out_len - out_off) {
 139                         /* truncated, should never happen */
 140                         talloc_free(out_str);
 141                         return NT_STATUS_INTERNAL_ERROR;
 142                 }
 143                 out_off += pushed;
 144         }
 145
 146         *(out_str + out_off) = '\0';
 147         *_out_str = out_str;
 148
 149         return NT_STATUS_OK;
 150 }
 151
 152 static NTSTATUS snapper_dbus_str_decode(TALLOC_CTX *mem_ctx, const char *in_str,
 153                                         char **_out_str)
 154 {
 155         size_t in_len;
 156         char *out_str;
 157         int i;
 158         int out_off;
 159         int out_len;
 160
 161         if (in_str == NULL) {
 162                 return NT_STATUS_INVALID_PARAMETER;
 163         }
 164
 165         in_len = strlen(in_str);
 166
 167         /* output cannot be larger than input, +1 for terminator */
 168         out_len = in_len + 1;
 169
 170         out_str = talloc_array(mem_ctx, char, out_len);
 171         if (out_str == NULL) {
 172                 return NT_STATUS_NO_MEMORY;
 173         }
 174
 175         out_off = 0;
 176         for (i = 0; i < in_len; i++) {
 177                 int j;
 178                 char hex_buf[3];
 179                 unsigned int non_ascii_byte;
 180
 181                 if (in_str[i] != '\\') {
 182                         out_str[out_off] = in_str[i];
 183                         out_off++;
 184                         continue;
 185                 }
 186
 187                 i++;
 188                 if (in_str[i] == '\\') {
 189                         out_str[out_off] = '\\';
 190                         out_off++;
 191                         continue;
 192                 } else if (in_str[i] != 'x') {
 193                         goto err_invalid_src_encoding;
 194                 }
 195
 196                 /* non-ASCII, encoded as two hex chars */
 197                 for (j = 0; j < 2; j++) {
 198                         i++;
 199                         if ((in_str[i] == '\0') || !isxdigit(in_str[i])) {
 200                                 goto err_invalid_src_encoding;
 201                         }
 202                         hex_buf[j] = in_str[i];
 203                 }
 204                 hex_buf[2] = '\0';
 205
 206                 sscanf(hex_buf, "%x", &non_ascii_byte);
 207                 out_str[out_off] = (unsigned char)non_ascii_byte;
 208                 out_off++;
 209         }
 210
 211         out_str[out_off] = '\0';
 212         *_out_str = out_str;
 213
 214         return NT_STATUS_OK;
 215 err_invalid_src_encoding:
 216         DEBUG(0, ("invalid encoding %s\n", in_str));
 217         return NT_STATUS_INVALID_PARAMETER;
 218 }
 219
 220 static DBusConnection *snapper_dbus_conn_create(void)
 221 {
 222         DBusError err;
 223         DBusConnection *dconn;
 224
 225         dbus_error_init(&err);
 226
 227         /*
 228          * Always create a new DBus connection, to ensure snapperd detects the
 229          * correct client [E]UID. With dbus_bus_get() it does not!
 230          */
 231         dconn = dbus_bus_get_private(DBUS_BUS_SYSTEM, &err);
 232         if (dbus_error_is_set(&err)) {
 233                 DEBUG(0, ("dbus connection error: %s\n", err.message));
 234                 dbus_error_free(&err);
 235         }
 236         if (dconn == NULL) {
 237                 return NULL;
 238         }
 239
 240         /* dbus_bus_get_private() sets exit-on-disconnect by default, undo it */
 241         dbus_connection_set_exit_on_disconnect(dconn, false);
 242
 243         return dconn;
 244 }
 245
 246 static void snapper_dbus_conn_destroy(DBusConnection *dconn)
 247 {
 248         if (dconn == NULL) {
 249                 DEBUG(2, ("attempt to destroy NULL dbus connection\n"));
 250                 return;
 251         }
 252
 253         dbus_connection_close(dconn);
 254         dbus_connection_unref(dconn);
 255 }
 256
 257 /*
 258  * send the message @send_msg over the dbus and wait for a response, return the
 259  * responsee via @recv_msg_out.
 260  * @send_msg is not freed, dbus_message_unref() must be handled by the caller.
 261  */
 262 static NTSTATUS snapper_dbus_msg_xchng(DBusConnection *dconn,
 263                                        DBusMessage *send_msg,
 264                                        DBusMessage **recv_msg_out)
 265 {
 266         DBusPendingCall *pending;
 267         DBusMessage *recv_msg;
 268
 269         /* send message and get a handle for a reply */
 270         if (!dbus_connection_send_with_reply(dconn, send_msg, &pending, -1)) {
 271                 return NT_STATUS_NO_MEMORY;
 272         }
 273         if (NULL == pending) {
 274                 DEBUG(0, ("dbus msg send failed\n"));
 275                 return NT_STATUS_UNSUCCESSFUL;
 276         }
 277
 278         dbus_connection_flush(dconn);
 279
 280         /* block until we receive a reply */
 281         dbus_pending_call_block(pending);
 282
 283         /* get the reply message */
 284         recv_msg = dbus_pending_call_steal_reply(pending);
 285         if (recv_msg == NULL) {
 286                 DEBUG(0, ("Reply Null\n"));
 287                 return NT_STATUS_UNSUCCESSFUL;
 288         }
 289         /* free the pending message handle */
 290         dbus_pending_call_unref(pending);
 291         *recv_msg_out = recv_msg;
 292
 293         return NT_STATUS_OK;
 294 }
 295
 296 static NTSTATUS snapper_type_check(DBusMessageIter *iter,
 297                                    int expected_type)
 298 {
 299         int type = dbus_message_iter_get_arg_type(iter);
 300         if (type != expected_type) {
 301                 DEBUG(0, ("got type %d, expecting %d\n",
 302                         type, expected_type));
 303                 return NT_STATUS_INVALID_PARAMETER;
 304         }
 305
 306         return NT_STATUS_OK;
 307 }
 308
 309 static NTSTATUS snapper_type_check_get(DBusMessageIter *iter,
 310                                        int expected_type,
 311                                        void *val)
 312 {
 313         NTSTATUS status;
 314         status = snapper_type_check(iter, expected_type);
 315         if (!NT_STATUS_IS_OK(status)) {
 316                 return status;
 317         }
 318
 319         dbus_message_iter_get_basic(iter, val);
 320
 321         return NT_STATUS_OK;
 322 }
 323
 324 static NTSTATUS snapper_dict_unpack(TALLOC_CTX *mem_ctx,
 325                                     DBusMessageIter *iter,
 326                                     struct snapper_dict *dict_out)
 327
 328 {
 329         NTSTATUS status;
 330         DBusMessageIter dct_iter;
 331         char *key_encoded;
 332         char *val_encoded;
 333
 334         status = snapper_type_check(iter, DBUS_TYPE_DICT_ENTRY);
 335         if (!NT_STATUS_IS_OK(status)) {
 336                 return status;
 337         }
 338         dbus_message_iter_recurse(iter, &dct_iter);
 339
 340         status = snapper_type_check_get(&dct_iter, DBUS_TYPE_STRING,
 341                                         &key_encoded);
 342         if (!NT_STATUS_IS_OK(status)) {
 343                 return status;
 344         }
 345         status = snapper_dbus_str_decode(mem_ctx, key_encoded, &dict_out->key);
 346         if (!NT_STATUS_IS_OK(status)) {
 347                 return status;
 348         }
 349
 350         dbus_message_iter_next(&dct_iter);
 351         status = snapper_type_check_get(&dct_iter, DBUS_TYPE_STRING,
 352                                         &val_encoded);
 353         if (!NT_STATUS_IS_OK(status)) {
 354                 talloc_free(dict_out->key);
 355                 return status;
 356         }
 357         status = snapper_dbus_str_decode(mem_ctx, val_encoded, &dict_out->val);
 358         if (!NT_STATUS_IS_OK(status)) {
 359                 talloc_free(dict_out->key);
 360                 return status;
 361         }
 362
 363         return NT_STATUS_OK;
 364 }
 365
 366 static void snapper_dict_array_print(uint32_t num_dicts,
 367                                      struct snapper_dict *dicts)
 368 {
 369         int i;
 370
 371         for (i = 0; i < num_dicts; i++) {
 372                 DEBUG(10, ("dict (key: %s, val: %s)\n",
 373                            dicts[i].key, dicts[i].val));
 374         }
 375 }
 376
 377 static NTSTATUS snapper_dict_array_unpack(TALLOC_CTX *mem_ctx,
 378                                           DBusMessageIter *iter,
 379                                           uint32_t *num_dicts_out,
 380                                           struct snapper_dict **dicts_out)
 381 {
 382         NTSTATUS status;
 383         DBusMessageIter array_iter;
 384         uint32_t num_dicts;
 385         struct snapper_dict *dicts = NULL;
 386
 387         status = snapper_type_check(iter, DBUS_TYPE_ARRAY);
 388         if (!NT_STATUS_IS_OK(status)) {
 389                 return status;
 390         }
 391         dbus_message_iter_recurse(iter, &array_iter);
 392
 393         num_dicts = 0;
 394         while (dbus_message_iter_get_arg_type(&array_iter)
 395                                                         != DBUS_TYPE_INVALID) {
 396                 num_dicts++;
 397                 dicts = talloc_realloc(mem_ctx, dicts, struct snapper_dict,
 398                                        num_dicts);
 399                 if (dicts == NULL)
 400                         abort();
 401
 402                 status = snapper_dict_unpack(mem_ctx, &array_iter,
 403                                              &dicts[num_dicts - 1]);
 404                 if (!NT_STATUS_IS_OK(status)) {
 405                         talloc_free(dicts);
 406                         return status;
 407                 }
 408                 dbus_message_iter_next(&array_iter);
 409         }
 410
 411         *num_dicts_out = num_dicts;
 412         *dicts_out = dicts;
 413
 414         return NT_STATUS_OK;
 415 }
 416
 417 static NTSTATUS snapper_list_confs_pack(DBusMessage **req_msg_out)
 418 {
 419         DBusMessage *msg;
 420
 421         msg = dbus_message_new_method_call("org.opensuse.Snapper",
 422                                            "/org/opensuse/Snapper",
 423                                            "org.opensuse.Snapper",
 424                                            "ListConfigs");
 425         if (msg == NULL) {
 426                 DEBUG(0, ("null msg\n"));
 427                 return NT_STATUS_NO_MEMORY;
 428         }
 429
 430         /* no arguments to append */
 431         *req_msg_out = msg;
 432
 433         return NT_STATUS_OK;
 434 }
 435
 436 static NTSTATUS snapper_conf_unpack(TALLOC_CTX *mem_ctx,
 437                                     DBusMessageIter *iter,
 438                                     struct snapper_conf *conf_out)
 439 {
 440         NTSTATUS status;
 441         DBusMessageIter st_iter;
 442         char *name_encoded;
 443         char *mnt_encoded;
 444
 445         status = snapper_type_check(iter, DBUS_TYPE_STRUCT);
 446         if (!NT_STATUS_IS_OK(status)) {
 447                 return status;
 448         }
 449         dbus_message_iter_recurse(iter, &st_iter);
 450
 451         status = snapper_type_check_get(&st_iter, DBUS_TYPE_STRING,
 452                                         &name_encoded);
 453         if (!NT_STATUS_IS_OK(status)) {
 454                 return status;
 455         }
 456
 457         status = snapper_dbus_str_decode(mem_ctx, name_encoded,
 458                                          &conf_out->name);
 459         if (!NT_STATUS_IS_OK(status)) {
 460                 return status;
 461         }
 462
 463         dbus_message_iter_next(&st_iter);
 464         status = snapper_type_check_get(&st_iter, DBUS_TYPE_STRING,
 465                                         &mnt_encoded);
 466         if (!NT_STATUS_IS_OK(status)) {
 467                 talloc_free(conf_out->name);
 468                 return status;
 469         }
 470
 471         status = snapper_dbus_str_decode(mem_ctx, mnt_encoded,
 472                                          &conf_out->mnt);
 473         if (!NT_STATUS_IS_OK(status)) {
 474                 talloc_free(conf_out->name);
 475                 return status;
 476         }
 477
 478         dbus_message_iter_next(&st_iter);
 479         status = snapper_dict_array_unpack(mem_ctx, &st_iter,
 480                                            &conf_out->num_attrs,
 481                                            &conf_out->attrs);
 482         if (!NT_STATUS_IS_OK(status)) {
 483                 talloc_free(conf_out->mnt);
 484                 talloc_free(conf_out->name);
 485                 return status;
 486         }
 487
 488         return NT_STATUS_OK;
 489 }
 490
 491 static struct snapper_conf *snapper_conf_array_base_find(int32_t num_confs,
 492                                                 struct snapper_conf *confs,
 493                                                          const char *base)
 494 {
 495         int i;
 496
 497         for (i = 0; i < num_confs; i++) {
 498                 if (strcmp(confs[i].mnt, base) == 0) {
 499                         DEBUG(5, ("found snapper conf %s for path %s\n",
 500                                   confs[i].name, base));
 501                         return &confs[i];
 502                 }
 503         }
 504         DEBUG(5, ("config for base %s not found\n", base));
 505
 506         return NULL;
 507 }
 508
 509 static void snapper_conf_array_print(int32_t num_confs,
 510                                      struct snapper_conf *confs)
 511 {
 512         int i;
 513
 514         for (i = 0; i < num_confs; i++) {
 515                 DEBUG(10, ("name: %s, mnt: %s\n",
 516                            confs[i].name, confs[i].mnt));
 517                 snapper_dict_array_print(confs[i].num_attrs, confs[i].attrs);
 518         }
 519 }
 520
 521 static NTSTATUS snapper_conf_array_unpack(TALLOC_CTX *mem_ctx,
 522                                           DBusMessageIter *iter,
 523                                           uint32_t *num_confs_out,
 524                                           struct snapper_conf **confs_out)
 525 {
 526         uint32_t num_confs;
 527         NTSTATUS status;
 528         struct snapper_conf *confs = NULL;
 529         DBusMessageIter array_iter;
 530
 531
 532         status = snapper_type_check(iter, DBUS_TYPE_ARRAY);
 533         if (!NT_STATUS_IS_OK(status)) {
 534                 return status;
 535         }
 536         dbus_message_iter_recurse(iter, &array_iter);
 537
 538         num_confs = 0;
 539         while (dbus_message_iter_get_arg_type(&array_iter)
 540                                                         != DBUS_TYPE_INVALID) {
 541                 num_confs++;
 542                 confs = talloc_realloc(mem_ctx, confs, struct snapper_conf,
 543                                        num_confs);
 544                 if (confs == NULL)
 545                         abort();
 546
 547                 status = snapper_conf_unpack(confs, &array_iter,
 548                                              &confs[num_confs - 1]);
 549                 if (!NT_STATUS_IS_OK(status)) {
 550                         talloc_free(confs);
 551                         return status;
 552                 }
 553                 dbus_message_iter_next(&array_iter);
 554         }
 555
 556         *num_confs_out = num_confs;
 557         *confs_out = confs;
 558
 559         return NT_STATUS_OK;
 560 }
 561
 562 static NTSTATUS snapper_list_confs_unpack(TALLOC_CTX *mem_ctx,
 563                                           DBusConnection *dconn,
 564                                           DBusMessage *rsp_msg,
 565                                           uint32_t *num_confs_out,
 566                                           struct snapper_conf **confs_out)
 567 {
 568         NTSTATUS status;
 569         DBusMessageIter iter;
 570         int msg_type;
 571         uint32_t num_confs;
 572         struct snapper_conf *confs;
 573         const char *sig;
 574
 575         msg_type = dbus_message_get_type(rsp_msg);
 576         if (msg_type == DBUS_MESSAGE_TYPE_ERROR) {
 577                 const char *err_str = dbus_message_get_error_name(rsp_msg);
 578                 DEBUG(0, ("list_confs error response: %s\n", err_str));
 579                 return snapper_err_ntstatus_map(err_str);
 580         }
 581
 582         if (msg_type != DBUS_MESSAGE_TYPE_METHOD_RETURN) {
 583                 DEBUG(0, ("unexpected list_confs ret type: %d\n",
 584                           msg_type));
 585                 return NT_STATUS_INVALID_PARAMETER;
 586         }
 587
 588         sig = dbus_message_get_signature(rsp_msg);
 589         if ((sig == NULL)
 590          || (strcmp(sig, SNAPPER_SIG_LIST_CONFS_RSP) != 0)) {
 591                 DEBUG(0, ("bad list confs response sig: %s, expected: %s\n",
 592                           (sig ? sig : "NULL"), SNAPPER_SIG_LIST_CONFS_RSP));
 593                 return NT_STATUS_INVALID_PARAMETER;
 594         }
 595
 596         if (!dbus_message_iter_init(rsp_msg, &iter)) {
 597                 /* FIXME return empty? */
 598                 DEBUG(0, ("Message has no arguments!\n"));
 599                 return NT_STATUS_INVALID_PARAMETER;
 600         }
 601
 602         status = snapper_conf_array_unpack(mem_ctx, &iter, &num_confs, &confs);
 603         if (!NT_STATUS_IS_OK(status)) {
 604                 DEBUG(0, ("failed to unpack conf array\n"));
 605                 return status;
 606         }
 607
 608         snapper_conf_array_print(num_confs, confs);
 609
 610         *num_confs_out = num_confs;
 611         *confs_out = confs;
 612
 613         return NT_STATUS_OK;
 614 }
 615
 616 static NTSTATUS snapper_list_snaps_pack(TALLOC_CTX *mem_ctx,
 617                                         char *snapper_conf,
 618                                         DBusMessage **req_msg_out)
 619 {
 620         DBusMessage *msg;
 621         DBusMessageIter args;
 622         char *conf_encoded;
 623         NTSTATUS status;
 624
 625         msg = dbus_message_new_method_call("org.opensuse.Snapper", /* target for the method call */
 626                                            "/org/opensuse/Snapper", /* object to call on */
 627                                            "org.opensuse.Snapper", /* interface to call on */
 628                                            "ListSnapshots"); /* method name */
 629         if (msg == NULL) {
 630                 DEBUG(0, ("failed to create list snaps message\n"));
 631                 return NT_STATUS_NO_MEMORY;
 632         }
 633
 634         status = snapper_dbus_str_encode(mem_ctx, snapper_conf, &conf_encoded);
 635         if (!NT_STATUS_IS_OK(status)) {
 636                 dbus_message_unref(msg);
 637                 return status;
 638         }
 639
 640         /* append arguments */
 641         dbus_message_iter_init_append(msg, &args);
 642         if (!dbus_message_iter_append_basic(&args, DBUS_TYPE_STRING,
 643                                             &conf_encoded)) {
 644                 talloc_free(conf_encoded);
 645                 dbus_message_unref(msg);
 646                 return NT_STATUS_NO_MEMORY;
 647         }
 648
 649         *req_msg_out = msg;
 650
 651         return NT_STATUS_OK;
 652 }
 653
 654 static NTSTATUS snapper_snap_struct_unpack(TALLOC_CTX *mem_ctx,
 655                                            DBusMessageIter *iter,
 656                                            struct snapper_snap *snap_out)
 657 {
 658         NTSTATUS status;
 659         DBusMessageIter st_iter;
 660         char *desc_encoded;
 661         char *cleanup_encoded;
 662
 663         status = snapper_type_check(iter, DBUS_TYPE_STRUCT);
 664         if (!NT_STATUS_IS_OK(status)) {
 665                 return status;
 666         }
 667         dbus_message_iter_recurse(iter, &st_iter);
 668
 669         status = snapper_type_check_get(&st_iter, DBUS_TYPE_UINT32,
 670                                         &snap_out->id);
 671         if (!NT_STATUS_IS_OK(status)) {
 672                 return status;
 673         }
 674
 675         dbus_message_iter_next(&st_iter);
 676         status = snapper_type_check_get(&st_iter, DBUS_TYPE_UINT16,
 677                                         &snap_out->type);
 678         if (!NT_STATUS_IS_OK(status)) {
 679                 return status;
 680         }
 681
 682         dbus_message_iter_next(&st_iter);
 683         status = snapper_type_check_get(&st_iter, DBUS_TYPE_UINT32,
 684                                         &snap_out->pre_id);
 685         if (!NT_STATUS_IS_OK(status)) {
 686                 return status;
 687         }
 688
 689         dbus_message_iter_next(&st_iter);
 690         status = snapper_type_check_get(&st_iter, DBUS_TYPE_INT64,
 691                                         &snap_out->time);
 692         if (!NT_STATUS_IS_OK(status)) {
 693                 return status;
 694         }
 695
 696         dbus_message_iter_next(&st_iter);
 697         status = snapper_type_check_get(&st_iter, DBUS_TYPE_UINT32,
 698                                         &snap_out->creator_uid);
 699         if (!NT_STATUS_IS_OK(status)) {
 700                 return status;
 701         }
 702
 703         dbus_message_iter_next(&st_iter);
 704         status = snapper_type_check_get(&st_iter, DBUS_TYPE_STRING,
 705                                         &desc_encoded);
 706         if (!NT_STATUS_IS_OK(status)) {
 707                 return status;
 708         }
 709
 710         status = snapper_dbus_str_decode(mem_ctx, desc_encoded,
 711                                          &snap_out->desc);
 712         if (!NT_STATUS_IS_OK(status)) {
 713                 return status;
 714         }
 715
 716         dbus_message_iter_next(&st_iter);
 717         status = snapper_type_check_get(&st_iter, DBUS_TYPE_STRING,
 718                                         &cleanup_encoded);
 719         if (!NT_STATUS_IS_OK(status)) {
 720                 talloc_free(snap_out->desc);
 721                 return status;
 722         }
 723
 724         status = snapper_dbus_str_decode(mem_ctx, cleanup_encoded,
 725                                          &snap_out->cleanup);
 726         if (!NT_STATUS_IS_OK(status)) {
 727                 talloc_free(snap_out->desc);
 728                 return status;
 729         }
 730
 731         dbus_message_iter_next(&st_iter);
 732         status = snapper_dict_array_unpack(mem_ctx, &st_iter,
 733                                            &snap_out->num_user_data,
 734                                            &snap_out->user_data);
 735         if (!NT_STATUS_IS_OK(status)) {
 736                 talloc_free(snap_out->cleanup);
 737                 talloc_free(snap_out->desc);
 738                 return status;
 739         }
 740
 741         return NT_STATUS_OK;
 742 }
 743
 744 static void snapper_snap_array_print(int32_t num_snaps,
 745                                      struct snapper_snap *snaps)
 746 {
 747         int i;
 748
 749         for (i = 0; i < num_snaps; i++) {
 750                 DEBUG(10, ("id: %u, "
 751                            "type: %u, "
 752                            "pre_id: %u, "
 753                            "time: %ld, "
 754                            "creator_uid: %u, "
 755                            "desc: %s, "
 756                            "cleanup: %s\n",
 757                            (unsigned int)snaps[i].id,
 758                            (unsigned int)snaps[i].type,
 759                            (unsigned int)snaps[i].pre_id,
 760                            (long int)snaps[i].time,
 761                            (unsigned int)snaps[i].creator_uid,
 762                            snaps[i].desc,
 763                            snaps[i].cleanup));
 764                 snapper_dict_array_print(snaps[i].num_user_data,
 765                                          snaps[i].user_data);
 766         }
 767 }
 768
 769 static NTSTATUS snapper_snap_array_unpack(TALLOC_CTX *mem_ctx,
 770                                           DBusMessageIter *iter,
 771                                           uint32_t *num_snaps_out,
 772                                           struct snapper_snap **snaps_out)
 773 {
 774         uint32_t num_snaps;
 775         NTSTATUS status;
 776         struct snapper_snap *snaps = NULL;
 777         DBusMessageIter array_iter;
 778
 779
 780         status = snapper_type_check(iter, DBUS_TYPE_ARRAY);
 781         if (!NT_STATUS_IS_OK(status)) {
 782                 return status;
 783         }
 784         dbus_message_iter_recurse(iter, &array_iter);
 785
 786         num_snaps = 0;
 787         while (dbus_message_iter_get_arg_type(&array_iter)
 788                                                         != DBUS_TYPE_INVALID) {
 789                 num_snaps++;
 790                 snaps = talloc_realloc(mem_ctx, snaps, struct snapper_snap,
 791                                        num_snaps);
 792                 if (snaps == NULL)
 793                         abort();
 794
 795                 status = snapper_snap_struct_unpack(snaps, &array_iter,
 796                                                     &snaps[num_snaps - 1]);
 797                 if (!NT_STATUS_IS_OK(status)) {
 798                         talloc_free(snaps);
 799                         return status;
 800                 }
 801                 dbus_message_iter_next(&array_iter);
 802         }
 803
 804         *num_snaps_out = num_snaps;
 805         *snaps_out = snaps;
 806
 807         return NT_STATUS_OK;
 808 }
 809
 810 static NTSTATUS snapper_list_snaps_unpack(TALLOC_CTX *mem_ctx,
 811                                           DBusMessage *rsp_msg,
 812                                           uint32_t *num_snaps_out,
 813                                           struct snapper_snap **snaps_out)
 814 {
 815         NTSTATUS status;
 816         DBusMessageIter iter;
 817         int msg_type;
 818         uint32_t num_snaps;
 819         struct snapper_snap *snaps;
 820         const char *sig;
 821
 822         msg_type = dbus_message_get_type(rsp_msg);
 823         if (msg_type == DBUS_MESSAGE_TYPE_ERROR) {
 824                 const char *err_str = dbus_message_get_error_name(rsp_msg);
 825                 DEBUG(0, ("list_snaps error response: %s\n", err_str));
 826                 return snapper_err_ntstatus_map(err_str);
 827         }
 828
 829         if (msg_type != DBUS_MESSAGE_TYPE_METHOD_RETURN) {
 830                 DEBUG(0,("unexpected list_snaps ret type: %d\n",
 831                          msg_type));
 832                 return NT_STATUS_INVALID_PARAMETER;
 833         }
 834
 835         sig = dbus_message_get_signature(rsp_msg);
 836         if ((sig == NULL)
 837          || (strcmp(sig, SNAPPER_SIG_LIST_SNAPS_RSP) != 0)) {
 838                 DEBUG(0, ("bad list snaps response sig: %s, "
 839                           "expected: %s\n",
 840                           (sig ? sig : "NULL"),
 841                           SNAPPER_SIG_LIST_SNAPS_RSP));
 842                 return NT_STATUS_INVALID_PARAMETER;
 843         }
 844
 845         /* read the parameters */
 846         if (!dbus_message_iter_init(rsp_msg, &iter)) {
 847                 DEBUG(0, ("response has no arguments!\n"));
 848                 return NT_STATUS_INVALID_PARAMETER;
 849         }
 850
 851         status = snapper_snap_array_unpack(mem_ctx, &iter, &num_snaps, &snaps);
 852         if (!NT_STATUS_IS_OK(status)) {
 853                 DEBUG(0, ("failed to unpack snap array\n"));
 854                 return NT_STATUS_INVALID_PARAMETER;
 855         }
 856
 857         snapper_snap_array_print(num_snaps, snaps);
 858
 859         *num_snaps_out = num_snaps;
 860         *snaps_out = snaps;
 861
 862         return NT_STATUS_OK;
 863 }
 864
 865 static NTSTATUS snapper_create_snap_pack(TALLOC_CTX *mem_ctx,
 866                                          const char *snapper_conf,
 867                                          const char *desc,
 868                                          uint32_t num_user_data,
 869                                          struct snapper_dict *user_data,
 870                                          DBusMessage **req_msg_out)
 871 {
 872         DBusMessage *msg;
 873         DBusMessageIter args;
 874         DBusMessageIter array_iter;
 875         DBusMessageIter struct_iter;
 876         const char *empty = "";
 877         char *str_encoded;
 878         uint32_t i;
 879         bool ok;
 880         TALLOC_CTX *enc_ctx;
 881         NTSTATUS status;
 882
 883         DEBUG(10, ("CreateSingleSnapshot: %s, %s, %s, num user %u\n",
 884                   snapper_conf, desc, empty, num_user_data));
 885
 886         enc_ctx = talloc_new(mem_ctx);
 887         if (enc_ctx == NULL) {
 888                 return NT_STATUS_NO_MEMORY;
 889         }
 890
 891         msg = dbus_message_new_method_call("org.opensuse.Snapper",
 892                                            "/org/opensuse/Snapper",
 893                                            "org.opensuse.Snapper",
 894                                            "CreateSingleSnapshot");
 895         if (msg == NULL) {
 896                 DEBUG(0, ("failed to create req msg\n"));
 897                 talloc_free(enc_ctx);
 898                 return NT_STATUS_NO_MEMORY;
 899         }
 900
 901         status = snapper_dbus_str_encode(enc_ctx, snapper_conf, &str_encoded);
 902         if (!NT_STATUS_IS_OK(status)) {
 903                 dbus_message_unref(msg);
 904                 talloc_free(enc_ctx);
 905                 return status;
 906         }
 907
 908         /* append arguments */
 909         dbus_message_iter_init_append(msg, &args);
 910         ok = dbus_message_iter_append_basic(&args, DBUS_TYPE_STRING,
 911                                             &str_encoded);
 912         if (!ok) {
 913                 dbus_message_unref(msg);
 914                 talloc_free(enc_ctx);
 915                 return NT_STATUS_NO_MEMORY;
 916         }
 917
 918         status = snapper_dbus_str_encode(enc_ctx, desc, &str_encoded);
 919         if (!NT_STATUS_IS_OK(status)) {
 920                 dbus_message_unref(msg);
 921                 talloc_free(enc_ctx);
 922                 return status;
 923         }
 924
 925         ok = dbus_message_iter_append_basic(&args, DBUS_TYPE_STRING,
 926                                             &str_encoded);
 927         if (!ok) {
 928                 dbus_message_unref(msg);
 929                 talloc_free(enc_ctx);
 930                 return NT_STATUS_NO_MEMORY;
 931         }
 932
 933         /* cleanup - no need to encode empty string */
 934         ok = dbus_message_iter_append_basic(&args, DBUS_TYPE_STRING,
 935                                             &empty);
 936         if (!ok) {
 937                 dbus_message_unref(msg);
 938                 talloc_free(enc_ctx);
 939                 return NT_STATUS_NO_MEMORY;
 940         }
 941
 942         ok = dbus_message_iter_open_container(&args, DBUS_TYPE_ARRAY,
 943                                               SNAPPER_SIG_STRING_DICT,
 944                                               &array_iter);
 945         if (!ok) {
 946                 dbus_message_unref(msg);
 947                 talloc_free(enc_ctx);
 948                 return NT_STATUS_NO_MEMORY;
 949         }
 950
 951         for (i = 0; i < num_user_data; i++) {
 952                 ok = dbus_message_iter_open_container(&array_iter,
 953                                                       DBUS_TYPE_DICT_ENTRY,
 954                                                       NULL, &struct_iter);
 955                 if (!ok) {
 956                         dbus_message_unref(msg);
 957                         talloc_free(enc_ctx);
 958                         return NT_STATUS_NO_MEMORY;
 959                 }
 960
 961                 status = snapper_dbus_str_encode(enc_ctx, user_data[i].key,
 962                                                  &str_encoded);
 963                 if (!NT_STATUS_IS_OK(status)) {
 964                         dbus_message_unref(msg);
 965                         talloc_free(enc_ctx);
 966                         return status;
 967                 }
 968
 969                 ok = dbus_message_iter_append_basic(&struct_iter,
 970                                                     DBUS_TYPE_STRING,
 971                                                     &str_encoded);
 972                 if (!ok) {
 973                         dbus_message_unref(msg);
 974                         talloc_free(enc_ctx);
 975                         return NT_STATUS_NO_MEMORY;
 976                 }
 977
 978                 status = snapper_dbus_str_encode(enc_ctx, user_data[i].val,
 979                                                  &str_encoded);
 980                 if (!NT_STATUS_IS_OK(status)) {
 981                         dbus_message_unref(msg);
 982                         talloc_free(enc_ctx);
 983                         return status;
 984                 }
 985
 986                 ok = dbus_message_iter_append_basic(&struct_iter,
 987                                                     DBUS_TYPE_STRING,
 988                                                     &str_encoded);
 989                 if (!ok) {
 990                         dbus_message_unref(msg);
 991                         talloc_free(enc_ctx);
 992                         return NT_STATUS_NO_MEMORY;
 993                 }
 994
 995                 ok = dbus_message_iter_close_container(&array_iter, &struct_iter);
 996                 if (!ok) {
 997                         dbus_message_unref(msg);
 998                         talloc_free(enc_ctx);
 999                         return NT_STATUS_NO_MEMORY;
1000                 }
1001         }
1002
1003         ok = dbus_message_iter_close_container(&args, &array_iter);
1004         if (!ok) {
1005                 dbus_message_unref(msg);
1006                 talloc_free(enc_ctx);
1007                 return NT_STATUS_NO_MEMORY;
1008         }
1009
1010         *req_msg_out = msg;
1011
1012         return NT_STATUS_OK;
1013 }
1014
1015 static NTSTATUS snapper_create_snap_unpack(DBusConnection *conn,
1016                                            DBusMessage *rsp_msg,
1017                                            uint32_t *snap_id_out)
1018 {
1019         NTSTATUS status;
1020         DBusMessageIter iter;
1021         int msg_type;
1022         const char *sig;
1023         uint32_t snap_id;
1024
1025         msg_type = dbus_message_get_type(rsp_msg);
1026         if (msg_type == DBUS_MESSAGE_TYPE_ERROR) {
1027                 const char *err_str = dbus_message_get_error_name(rsp_msg);
1028                 DEBUG(0, ("create snap error response: %s, euid %d egid %d\n",
1029                           err_str, geteuid(), getegid()));
1030                 return snapper_err_ntstatus_map(err_str);
1031         }
1032
1033         if (msg_type != DBUS_MESSAGE_TYPE_METHOD_RETURN) {
1034                 DEBUG(0, ("unexpected create snap ret type: %d\n",
1035                           msg_type));
1036                 return NT_STATUS_INVALID_PARAMETER;
1037         }
1038
1039         sig = dbus_message_get_signature(rsp_msg);
1040         if ((sig == NULL)
1041          || (strcmp(sig, SNAPPER_SIG_CREATE_SNAP_RSP) != 0)) {
1042                 DEBUG(0, ("bad create snap response sig: %s, expected: %s\n",
1043                           (sig ? sig : "NULL"), SNAPPER_SIG_CREATE_SNAP_RSP));
1044                 return NT_STATUS_INVALID_PARAMETER;
1045         }
1046
1047         /* read the parameters */
1048         if (!dbus_message_iter_init(rsp_msg, &iter)) {
1049                 DEBUG(0, ("response has no arguments!\n"));
1050                 return NT_STATUS_INVALID_PARAMETER;
1051         }
1052
1053         status = snapper_type_check_get(&iter, DBUS_TYPE_UINT32, &snap_id);
1054         if (!NT_STATUS_IS_OK(status)) {
1055                 return status;
1056         }
1057         *snap_id_out = snap_id;
1058
1059         return NT_STATUS_OK;
1060 }
1061
1062 static NTSTATUS snapper_del_snap_pack(TALLOC_CTX *mem_ctx,
1063                                       const char *snapper_conf,
1064                                       uint32_t snap_id,
1065                                       DBusMessage **req_msg_out)
1066 {
1067         DBusMessage *msg;
1068         DBusMessageIter args;
1069         DBusMessageIter array_iter;
1070         char *conf_encoded;
1071         bool ok;
1072         NTSTATUS status;
1073
1074         msg = dbus_message_new_method_call("org.opensuse.Snapper",
1075                                            "/org/opensuse/Snapper",
1076                                            "org.opensuse.Snapper",
1077                                            "DeleteSnapshots");
1078         if (msg == NULL) {
1079                 DEBUG(0, ("failed to create req msg\n"));
1080                 return NT_STATUS_NO_MEMORY;
1081         }
1082
1083         status = snapper_dbus_str_encode(mem_ctx, snapper_conf, &conf_encoded);
1084         if (!NT_STATUS_IS_OK(status)) {
1085                 dbus_message_unref(msg);
1086                 return status;
1087         }
1088
1089         /* append arguments */
1090         dbus_message_iter_init_append(msg, &args);
1091         ok = dbus_message_iter_append_basic(&args, DBUS_TYPE_STRING,
1092                                             &conf_encoded);
1093         if (!ok) {
1094                 talloc_free(conf_encoded);
1095                 dbus_message_unref(msg);
1096                 return NT_STATUS_NO_MEMORY;
1097         }
1098
1099         ok = dbus_message_iter_open_container(&args, DBUS_TYPE_ARRAY,
1100                                                DBUS_TYPE_UINT32_AS_STRING,
1101                                                &array_iter);
1102         if (!ok) {
1103                 talloc_free(conf_encoded);
1104                 dbus_message_unref(msg);
1105                 return NT_STATUS_NO_MEMORY;
1106         }
1107
1108         ok = dbus_message_iter_append_basic(&array_iter,
1109                                             DBUS_TYPE_UINT32,
1110                                             &snap_id);
1111         if (!ok) {
1112                 talloc_free(conf_encoded);
1113                 dbus_message_unref(msg);
1114                 return NT_STATUS_NO_MEMORY;
1115         }
1116
1117         dbus_message_iter_close_container(&args, &array_iter);
1118         *req_msg_out = msg;
1119
1120         return NT_STATUS_OK;
1121 }
1122
1123 static NTSTATUS snapper_del_snap_unpack(DBusConnection *conn,
1124                                         DBusMessage *rsp_msg)
1125 {
1126         int msg_type;
1127         const char *sig;
1128
1129         msg_type = dbus_message_get_type(rsp_msg);
1130         if (msg_type == DBUS_MESSAGE_TYPE_ERROR) {
1131                 const char *err_str = dbus_message_get_error_name(rsp_msg);
1132                 DEBUG(0, ("del snap error response: %s\n", err_str));
1133                 return snapper_err_ntstatus_map(err_str);
1134         }
1135
1136         if (msg_type != DBUS_MESSAGE_TYPE_METHOD_RETURN) {
1137                 DEBUG(0, ("unexpected del snap ret type: %d\n",
1138                           msg_type));
1139                 return NT_STATUS_INVALID_PARAMETER;
1140         }
1141
1142         sig = dbus_message_get_signature(rsp_msg);
1143         if ((sig == NULL)
1144          || (strcmp(sig, SNAPPER_SIG_DEL_SNAPS_RSP) != 0)) {
1145                 DEBUG(0, ("bad create snap response sig: %s, expected: %s\n",
1146                           (sig ? sig : "NULL"), SNAPPER_SIG_DEL_SNAPS_RSP));
1147                 return NT_STATUS_INVALID_PARAMETER;
1148         }
1149
1150         /* no parameters in response */
1151
1152         return NT_STATUS_OK;
1153 }
1154
1155 static NTSTATUS snapper_list_snaps_at_time_pack(TALLOC_CTX *mem_ctx,
1156                                                 const char *snapper_conf,
1157                                                 time_t time_lower,
1158                                                 time_t time_upper,
1159                                                 DBusMessage **req_msg_out)
1160 {
1161         DBusMessage *msg;
1162         DBusMessageIter args;
1163         char *conf_encoded;
1164         NTSTATUS status;
1165
1166         msg = dbus_message_new_method_call("org.opensuse.Snapper",
1167                                            "/org/opensuse/Snapper",
1168                                            "org.opensuse.Snapper",
1169                                            "ListSnapshotsAtTime");
1170         if (msg == NULL) {
1171                 DEBUG(0, ("failed to create list snaps message\n"));
1172                 return NT_STATUS_NO_MEMORY;
1173         }
1174
1175         status = snapper_dbus_str_encode(mem_ctx, snapper_conf, &conf_encoded);
1176         if (!NT_STATUS_IS_OK(status)) {
1177                 dbus_message_unref(msg);
1178                 return status;
1179         }
1180
1181         dbus_message_iter_init_append(msg, &args);
1182         if (!dbus_message_iter_append_basic(&args, DBUS_TYPE_STRING,
1183                                             &conf_encoded)) {
1184                 talloc_free(conf_encoded);
1185                 dbus_message_unref(msg);
1186                 return NT_STATUS_NO_MEMORY;
1187         }
1188
1189         if (!dbus_message_iter_append_basic(&args, DBUS_TYPE_INT64,
1190                                             &time_lower)) {
1191                 talloc_free(conf_encoded);
1192                 dbus_message_unref(msg);
1193                 return NT_STATUS_NO_MEMORY;
1194         }
1195
1196         if (!dbus_message_iter_append_basic(&args, DBUS_TYPE_INT64,
1197                                             &time_upper)) {
1198                 talloc_free(conf_encoded);
1199                 dbus_message_unref(msg);
1200                 return NT_STATUS_NO_MEMORY;
1201         }
1202
1203         *req_msg_out = msg;
1204
1205         return NT_STATUS_OK;
1206 }
1207 /* no snapper_list_snaps_at_time_unpack, use snapper_list_snaps_unpack */
1208
1209 /*
1210  * Determine the snapper snapshot id given a path.
1211  * Ideally this should be determined via a lookup.
1212  */
1213 static NTSTATUS snapper_snap_path_to_id(TALLOC_CTX *mem_ctx,
1214                                         const char *snap_path,
1215                                         uint32_t *snap_id_out)
1216 {
1217         char *path_dup;
1218         char *str_idx;
1219         uint32_t snap_id;
1220         int error = 0;
1221
1222         path_dup = talloc_strdup(mem_ctx, snap_path);
1223         if (path_dup == NULL) {
1224                 return NT_STATUS_NO_MEMORY;
1225         }
1226
1227         /* trim trailing '/' */
1228         str_idx = path_dup + strlen(path_dup) - 1;
1229         while (*str_idx == '/') {
1230                 *str_idx = '\0';
1231                 str_idx--;
1232         }
1233
1234         str_idx = strrchr(path_dup, '/');
1235         if ((str_idx == NULL)
1236          || (strcmp(str_idx + 1, "snapshot") != 0)) {
1237                 talloc_free(path_dup);
1238                 return NT_STATUS_INVALID_PARAMETER;
1239         }
1240
1241         while (*str_idx == '/') {
1242                 *str_idx = '\0';
1243                 str_idx--;
1244         }
1245
1246         str_idx = strrchr(path_dup, '/');
1247         if (str_idx == NULL) {
1248                 talloc_free(path_dup);
1249                 return NT_STATUS_INVALID_PARAMETER;
1250         }
1251
1252         str_idx++;
1253         snap_id = smb_strtoul(str_idx, NULL, 10, &error, SMB_STR_STANDARD);
1254         if (error != 0) {
1255                 talloc_free(path_dup);
1256                 return NT_STATUS_INVALID_PARAMETER;
1257         }
1258
1259         talloc_free(path_dup);
1260         *snap_id_out = snap_id;
1261         return NT_STATUS_OK;
1262 }
1263
1264 /*
1265  * Determine the snapper snapshot path given an id and base.
1266  * Ideally this should be determined via a lookup.
1267  */
1268 static NTSTATUS snapper_snap_id_to_path(TALLOC_CTX *mem_ctx,
1269                                         const char *base_path,
1270                                         uint32_t snap_id,
1271                                         char **snap_path_out)
1272 {
1273         char *snap_path;
1274
1275         snap_path = talloc_asprintf(mem_ctx, "%s/.snapshots/%u/snapshot",
1276                                     base_path, snap_id);
1277         if (snap_path == NULL) {
1278                 return NT_STATUS_NO_MEMORY;
1279         }
1280
1281         *snap_path_out = snap_path;
1282         return NT_STATUS_OK;
1283 }
1284
1285 static NTSTATUS snapper_get_conf_call(TALLOC_CTX *mem_ctx,
1286                                       DBusConnection *dconn,
1287                                       const char *path,
1288                                       char **conf_name_out,
1289                                       char **base_path_out)
1290 {
1291         NTSTATUS status;
1292         DBusMessage *req_msg;
1293         DBusMessage *rsp_msg;
1294         uint32_t num_confs = 0;
1295         struct snapper_conf *confs = NULL;
1296         struct snapper_conf *conf;
1297         char *conf_name;
1298         char *base_path;
1299
1300         status = snapper_list_confs_pack(&req_msg);
1301         if (!NT_STATUS_IS_OK(status)) {
1302                 goto err_out;
1303         }
1304
1305         status = snapper_dbus_msg_xchng(dconn, req_msg, &rsp_msg);
1306         if (!NT_STATUS_IS_OK(status)) {
1307                 goto err_req_free;
1308         }
1309
1310         status = snapper_list_confs_unpack(mem_ctx, dconn, rsp_msg,
1311                                            &num_confs, &confs);
1312         if (!NT_STATUS_IS_OK(status)) {
1313                 goto err_rsp_free;
1314         }
1315
1316         /*
1317          * for now we only support shares where the path directly corresponds
1318          * to a snapper configuration.
1319          */
1320         conf = snapper_conf_array_base_find(num_confs, confs,
1321                                             path);
1322         if (conf == NULL) {
1323                 status = NT_STATUS_NOT_SUPPORTED;
1324                 goto err_array_free;
1325         }
1326
1327         conf_name = talloc_strdup(mem_ctx, conf->name);
1328         if (conf_name == NULL) {
1329                 status = NT_STATUS_NO_MEMORY;
1330                 goto err_array_free;
1331         }
1332         base_path = talloc_strdup(mem_ctx, conf->mnt);
1333         if (base_path == NULL) {
1334                 status = NT_STATUS_NO_MEMORY;
1335                 goto err_conf_name_free;
1336         }
1337
1338         talloc_free(confs);
1339         dbus_message_unref(rsp_msg);
1340         dbus_message_unref(req_msg);
1341
1342         *conf_name_out = conf_name;
1343         *base_path_out = base_path;
1344
1345         return NT_STATUS_OK;
1346
1347 err_conf_name_free:
1348         talloc_free(conf_name);
1349 err_array_free:
1350         talloc_free(confs);
1351 err_rsp_free:
1352         dbus_message_unref(rsp_msg);
1353 err_req_free:
1354         dbus_message_unref(req_msg);
1355 err_out:
1356         return status;
1357 }
1358
1359 /*
1360  * Check whether a path can be shadow copied. Return the base volume, allowing
1361  * the caller to determine if multiple paths lie on the same base volume.
1362  */
1363 static NTSTATUS snapper_snap_check_path(struct vfs_handle_struct *handle,
1364                                         TALLOC_CTX *mem_ctx,
1365                                         const char *service_path,
1366                                         char **base_volume)
1367 {
1368         NTSTATUS status;
1369         DBusConnection *dconn;
1370         char *conf_name;
1371         char *base_path;
1372
1373         dconn = snapper_dbus_conn_create();
1374         if (dconn == NULL) {
1375                 return NT_STATUS_UNSUCCESSFUL;
1376         }
1377
1378         status = snapper_get_conf_call(mem_ctx, dconn, service_path,
1379                                        &conf_name, &base_path);
1380         if (!NT_STATUS_IS_OK(status)) {
1381                 goto err_conn_close;
1382         }
1383
1384         talloc_free(conf_name);
1385         *base_volume = base_path;
1386         snapper_dbus_conn_destroy(dconn);
1387
1388         return NT_STATUS_OK;
1389
1390 err_conn_close:
1391         snapper_dbus_conn_destroy(dconn);
1392         return status;
1393 }
1394
1395 static NTSTATUS snapper_create_snap_call(TALLOC_CTX *mem_ctx,
1396                                          DBusConnection *dconn,
1397                                          const char *conf_name,
1398                                          const char *base_path,
1399                                          const char *snap_desc,
1400                                          uint32_t num_user_data,
1401                                          struct snapper_dict *user_data,
1402                                          char **snap_path_out)
1403 {
1404         NTSTATUS status;
1405         DBusMessage *req_msg;
1406         DBusMessage *rsp_msg;
1407         uint32_t snap_id = 0;
1408         char *snap_path;
1409
1410         status = snapper_create_snap_pack(mem_ctx,
1411                                           conf_name,
1412                                           snap_desc,
1413                                           num_user_data,
1414                                           user_data,
1415                                           &req_msg);
1416         if (!NT_STATUS_IS_OK(status)) {
1417                 goto err_out;
1418         }
1419
1420         status = snapper_dbus_msg_xchng(dconn, req_msg, &rsp_msg);
1421         if (!NT_STATUS_IS_OK(status)) {
1422                 goto err_req_free;
1423         }
1424
1425         status = snapper_create_snap_unpack(dconn, rsp_msg, &snap_id);
1426         if (!NT_STATUS_IS_OK(status)) {
1427                 goto err_rsp_free;
1428         }
1429
1430         status = snapper_snap_id_to_path(mem_ctx, base_path, snap_id,
1431                                          &snap_path);
1432         if (!NT_STATUS_IS_OK(status)) {
1433                 goto err_rsp_free;
1434         }
1435
1436         dbus_message_unref(rsp_msg);
1437         dbus_message_unref(req_msg);
1438
1439         DEBUG(6, ("created new snapshot %u at %s\n", snap_id, snap_path));
1440         *snap_path_out = snap_path;
1441
1442         return NT_STATUS_OK;
1443
1444 err_rsp_free:
1445         dbus_message_unref(rsp_msg);
1446 err_req_free:
1447         dbus_message_unref(req_msg);
1448 err_out:
1449         return status;
1450 }
1451
1452 static NTSTATUS snapper_snap_create(struct vfs_handle_struct *handle,
1453                                     TALLOC_CTX *mem_ctx,
1454                                     const char *base_volume,
1455                                     time_t *tstamp,
1456                                     bool rw,
1457                                     char **_base_path,
1458                                     char **_snap_path)
1459 {
1460         DBusConnection *dconn;
1461         NTSTATUS status;
1462         char *conf_name;
1463         char *base_path;
1464         char *snap_path = NULL;
1465         TALLOC_CTX *tmp_ctx;
1466
1467         tmp_ctx = talloc_new(mem_ctx);
1468         if (tmp_ctx == NULL) {
1469                 return NT_STATUS_NO_MEMORY;
1470         }
1471
1472         dconn = snapper_dbus_conn_create();
1473         if (dconn == NULL) {
1474                 talloc_free(tmp_ctx);
1475                 return NT_STATUS_UNSUCCESSFUL;
1476         }
1477
1478         status = snapper_get_conf_call(tmp_ctx, dconn, base_volume,
1479                                        &conf_name, &base_path);
1480         if (!NT_STATUS_IS_OK(status)) {
1481                 snapper_dbus_conn_destroy(dconn);
1482                 talloc_free(tmp_ctx);
1483                 return status;
1484         }
1485
1486         status = snapper_create_snap_call(tmp_ctx, dconn,
1487                                           conf_name, base_path,
1488                                           "Snapshot created by Samba",
1489                                           0, NULL,
1490                                           &snap_path);
1491         if (!NT_STATUS_IS_OK(status)) {
1492                 snapper_dbus_conn_destroy(dconn);
1493                 talloc_free(tmp_ctx);
1494                 return status;
1495         }
1496
1497         snapper_dbus_conn_destroy(dconn);
1498         *_base_path = talloc_steal(mem_ctx, base_path);
1499         *_snap_path = talloc_steal(mem_ctx, snap_path);
1500         talloc_free(tmp_ctx);
1501
1502         return NT_STATUS_OK;
1503 }
1504
1505 static NTSTATUS snapper_delete_snap_call(TALLOC_CTX *mem_ctx,
1506                                          DBusConnection *dconn,
1507                                          const char *conf_name,
1508                                          uint32_t snap_id)
1509 {
1510         NTSTATUS status;
1511         DBusMessage *req_msg = NULL;
1512         DBusMessage *rsp_msg;
1513
1514         status = snapper_del_snap_pack(mem_ctx, conf_name, snap_id, &req_msg);
1515         if (!NT_STATUS_IS_OK(status)) {
1516                 goto err_out;
1517         }
1518
1519         status = snapper_dbus_msg_xchng(dconn, req_msg, &rsp_msg);
1520         if (!NT_STATUS_IS_OK(status)) {
1521                 goto err_req_free;
1522         }
1523
1524         status = snapper_del_snap_unpack(dconn, rsp_msg);
1525         if (!NT_STATUS_IS_OK(status)) {
1526                 goto err_rsp_free;
1527         }
1528
1529         dbus_message_unref(rsp_msg);
1530         dbus_message_unref(req_msg);
1531
1532         DEBUG(6, ("deleted snapshot %u\n", snap_id));
1533
1534         return NT_STATUS_OK;
1535
1536 err_rsp_free:
1537         dbus_message_unref(rsp_msg);
1538 err_req_free:
1539         dbus_message_unref(req_msg);
1540 err_out:
1541         return status;
1542 }
1543
1544 static NTSTATUS snapper_snap_delete(struct vfs_handle_struct *handle,
1545                                     TALLOC_CTX *mem_ctx,
1546                                     char *base_path,
1547                                     char *snap_path)
1548 {
1549         DBusConnection *dconn;
1550         NTSTATUS status;
1551         char *conf_name;
1552         char *snap_base_path;
1553         uint32_t snap_id;
1554         TALLOC_CTX *tmp_ctx;
1555
1556         tmp_ctx = talloc_new(mem_ctx);
1557         if (tmp_ctx == NULL) {
1558                 return NT_STATUS_NO_MEMORY;
1559         }
1560
1561         dconn = snapper_dbus_conn_create();
1562         if (dconn == NULL) {
1563                 talloc_free(tmp_ctx);
1564                 return NT_STATUS_UNSUCCESSFUL;
1565         }
1566
1567         status = snapper_get_conf_call(tmp_ctx, dconn, base_path,
1568                                        &conf_name, &snap_base_path);
1569         if (!NT_STATUS_IS_OK(status)) {
1570                 snapper_dbus_conn_destroy(dconn);
1571                 talloc_free(tmp_ctx);
1572                 return status;
1573         }
1574
1575         status = snapper_snap_path_to_id(tmp_ctx, snap_path, &snap_id);
1576         if (!NT_STATUS_IS_OK(status)) {
1577                 snapper_dbus_conn_destroy(dconn);
1578                 talloc_free(tmp_ctx);
1579                 return status;
1580         }
1581
1582         status = snapper_delete_snap_call(tmp_ctx, dconn, conf_name, snap_id);
1583         if (!NT_STATUS_IS_OK(status)) {
1584                 snapper_dbus_conn_destroy(dconn);
1585                 talloc_free(tmp_ctx);
1586                 return status;
1587         }
1588
1589         snapper_dbus_conn_destroy(dconn);
1590         talloc_free(tmp_ctx);
1591
1592         return NT_STATUS_OK;
1593 }
1594
1595 /* sc_data used as parent talloc context for all labels */
1596 static int snapper_get_shadow_copy_data(struct vfs_handle_struct *handle,
1597                                         struct files_struct *fsp,
1598                                         struct shadow_copy_data *sc_data,
1599                                         bool labels)
1600 {
1601         DBusConnection *dconn;
1602         TALLOC_CTX *tmp_ctx;
1603         NTSTATUS status;
1604         char *conf_name;
1605         char *base_path;
1606         DBusMessage *req_msg = NULL;
1607         DBusMessage *rsp_msg;
1608         uint32_t num_snaps;
1609         struct snapper_snap *snaps;
1610         uint32_t i;
1611         uint32_t lbl_off;
1612
1613         tmp_ctx = talloc_new(sc_data);
1614         if (tmp_ctx == NULL) {
1615                 status = NT_STATUS_NO_MEMORY;
1616                 goto err_out;
1617         }
1618
1619         dconn = snapper_dbus_conn_create();
1620         if (dconn == NULL) {
1621                 status = NT_STATUS_UNSUCCESSFUL;
1622                 goto err_mem_ctx_free;
1623         }
1624
1625         if (fsp->conn->connectpath == NULL) {
1626                 status = NT_STATUS_INVALID_PARAMETER;
1627                 goto err_conn_free;
1628         }
1629
1630         status = snapper_get_conf_call(tmp_ctx, dconn,
1631                                        fsp->conn->connectpath,
1632                                        &conf_name,
1633                                        &base_path);
1634         if (!NT_STATUS_IS_OK(status)) {
1635                 goto err_conn_free;
1636         }
1637
1638         status = snapper_list_snaps_pack(tmp_ctx, conf_name, &req_msg);
1639         if (!NT_STATUS_IS_OK(status)) {
1640                 goto err_conn_free;
1641         }
1642
1643         status = snapper_dbus_msg_xchng(dconn, req_msg, &rsp_msg);
1644         if (!NT_STATUS_IS_OK(status)) {
1645                 goto err_req_free;
1646         }
1647
1648         status = snapper_list_snaps_unpack(tmp_ctx, rsp_msg,
1649                                            &num_snaps, &snaps);
1650         if (!NT_STATUS_IS_OK(status)) {
1651                 goto err_rsp_free;
1652         }
1653         /* we should always get at least one snapshot (current) */
1654         if (num_snaps == 0) {
1655                 DEBUG(1, ("zero snapshots in snap list response\n"));
1656                 status = NT_STATUS_UNSUCCESSFUL;
1657                 goto err_rsp_free;
1658         }
1659
1660         /* subtract 1, (current) snapshot is not returned */
1661         sc_data->num_volumes = num_snaps - 1;
1662         sc_data->labels = NULL;
1663
1664         if ((labels == false) || (sc_data->num_volumes == 0)) {
1665                 /* tokens need not be added to the labels array */
1666                 goto done;
1667         }
1668
1669         sc_data->labels = talloc_array(sc_data, SHADOW_COPY_LABEL,
1670                                        sc_data->num_volumes);
1671         if (sc_data->labels == NULL) {
1672                 status = NT_STATUS_NO_MEMORY;
1673                 goto err_rsp_free;
1674         }
1675
1676         /* start at end for decending order, do not include 0 (current) */
1677         lbl_off = 0;
1678         for (i = num_snaps - 1; i > 0; i--) {
1679                 char *lbl = sc_data->labels[lbl_off++];
1680                 struct tm gmt_snap_time;
1681                 struct tm *tm_ret;
1682                 size_t str_sz;
1683
1684                 tm_ret = gmtime_r((time_t *)&snaps[i].time, &gmt_snap_time);
1685                 if (tm_ret == NULL) {
1686                         status = NT_STATUS_UNSUCCESSFUL;
1687                         goto err_labels_free;
1688                 }
1689                 str_sz = strftime(lbl, sizeof(SHADOW_COPY_LABEL),
1690                                   "@GMT-%Y.%m.%d-%H.%M.%S", &gmt_snap_time);
1691                 if (str_sz == 0) {
1692                         status = NT_STATUS_UNSUCCESSFUL;
1693                         goto err_labels_free;
1694                 }
1695         }
1696
1697 done:
1698         talloc_free(tmp_ctx);
1699         dbus_message_unref(rsp_msg);
1700         dbus_message_unref(req_msg);
1701         snapper_dbus_conn_destroy(dconn);
1702
1703         return 0;
1704
1705 err_labels_free:
1706         TALLOC_FREE(sc_data->labels);
1707 err_rsp_free:
1708         dbus_message_unref(rsp_msg);
1709 err_req_free:
1710         dbus_message_unref(req_msg);
1711 err_conn_free:
1712         snapper_dbus_conn_destroy(dconn);
1713 err_mem_ctx_free:
1714         talloc_free(tmp_ctx);
1715 err_out:
1716         errno = map_errno_from_nt_status(status);
1717         return -1;
1718 }
1719
1720 static bool snapper_gmt_strip_snapshot(TALLOC_CTX *mem_ctx,
1721                                        struct vfs_handle_struct *handle,
1722                                        const char *name,
1723                                        time_t *ptimestamp,
1724                                        char **pstripped)
1725 {
1726         struct tm tm;
1727         time_t timestamp;
1728         const char *p;
1729         char *q;
1730         char *stripped;
1731         size_t rest_len, dst_len;
1732         ptrdiff_t len_before_gmt;
1733
1734         p = strstr_m(name, "@GMT-");
1735         if (p == NULL) {
1736                 goto no_snapshot;
1737         }
1738         if ((p > name) && (p[-1] != '/')) {
1739                 goto no_snapshot;
1740         }
1741         len_before_gmt = p - name;
1742         q = strptime(p, GMT_FORMAT, &tm);
1743         if (q == NULL) {
1744                 goto no_snapshot;
1745         }
1746         tm.tm_isdst = -1;
1747         timestamp = timegm(&tm);
1748         if (timestamp == (time_t)-1) {
1749                 goto no_snapshot;
1750         }
1751         if (q[0] == '\0') {
1752                 /*
1753                  * The name consists of only the GMT token or the GMT
1754                  * token is at the end of the path. XP seems to send
1755                  * @GMT- at the end under certain circumstances even
1756                  * with a path prefix.
1757                  */
1758                 if (pstripped != NULL) {
1759                         if (len_before_gmt > 0) {
1760                                 /*
1761                                  * There is a slash before
1762                                  * the @GMT-. Remove it.
1763                                  */
1764                                 len_before_gmt -= 1;
1765                         }
1766                         stripped = talloc_strndup(mem_ctx, name,
1767                                         len_before_gmt);
1768                         if (stripped == NULL) {
1769                                 return false;
1770                         }
1771                         *pstripped = stripped;
1772                 }
1773                 *ptimestamp = timestamp;
1774                 return true;
1775         }
1776         if (q[0] != '/') {
1777                 /*
1778                  * It is not a complete path component, i.e. the path
1779                  * component continues after the gmt-token.
1780                  */
1781                 goto no_snapshot;
1782         }
1783         q += 1;
1784
1785         rest_len = strlen(q);
1786         dst_len = len_before_gmt + rest_len;
1787
1788         if (pstripped != NULL) {
1789                 stripped = talloc_array(mem_ctx, char, dst_len+1);
1790                 if (stripped == NULL) {
1791                         errno = ENOMEM;
1792                         return false;
1793                 }
1794                 if (p > name) {
1795                         memcpy(stripped, name, len_before_gmt);
1796                 }
1797                 if (rest_len > 0) {
1798                         memcpy(stripped + len_before_gmt, q, rest_len);
1799                 }
1800                 stripped[dst_len] = '\0';
1801                 *pstripped = stripped;
1802         }
1803         *ptimestamp = timestamp;
1804         return true;
1805 no_snapshot:
1806         *ptimestamp = 0;
1807         return true;
1808 }
1809
1810 static NTSTATUS snapper_get_snap_at_time_call(TALLOC_CTX *mem_ctx,
1811                                               DBusConnection *dconn,
1812                                               const char *conf_name,
1813                                               const char *base_path,
1814                                               time_t snaptime,
1815                                               char **snap_path_out)
1816 {
1817         NTSTATUS status;
1818         DBusMessage *req_msg = NULL;
1819         DBusMessage *rsp_msg;
1820         uint32_t num_snaps;
1821         struct snapper_snap *snaps;
1822         char *snap_path;
1823
1824         status = snapper_list_snaps_at_time_pack(mem_ctx,
1825                                                  conf_name,
1826                                                  snaptime,
1827                                                  snaptime,
1828                                                  &req_msg);
1829         if (!NT_STATUS_IS_OK(status)) {
1830                 goto err_out;
1831         }
1832
1833         status = snapper_dbus_msg_xchng(dconn, req_msg, &rsp_msg);
1834         if (!NT_STATUS_IS_OK(status)) {
1835                 goto err_req_free;
1836         }
1837
1838         status = snapper_list_snaps_unpack(mem_ctx, rsp_msg,
1839                                            &num_snaps, &snaps);
1840         if (!NT_STATUS_IS_OK(status)) {
1841                 goto err_rsp_free;
1842         }
1843
1844         if (num_snaps == 0) {
1845                 DEBUG(4, ("no snapshots found with time: %lu\n",
1846                           (unsigned long)snaptime));
1847                 status = NT_STATUS_INVALID_PARAMETER;
1848                 goto err_snap_array_free;
1849         } else if (num_snaps > 0) {
1850                 DEBUG(4, ("got %u snapshots for single time %lu, using top\n",
1851                           num_snaps, (unsigned long)snaptime));
1852         }
1853
1854         status = snapper_snap_id_to_path(mem_ctx, base_path, snaps[0].id,
1855                                          &snap_path);
1856         if (!NT_STATUS_IS_OK(status)) {
1857                 goto err_snap_array_free;
1858         }
1859
1860         *snap_path_out = snap_path;
1861 err_snap_array_free:
1862         talloc_free(snaps);
1863 err_rsp_free:
1864         dbus_message_unref(rsp_msg);
1865 err_req_free:
1866         dbus_message_unref(req_msg);
1867 err_out:
1868         return status;
1869 }
1870
1871 static NTSTATUS snapper_snap_path_expand(struct connection_struct *conn,
1872                                          TALLOC_CTX *mem_ctx,
1873                                          time_t snap_time,
1874                                          char **snap_dir_out)
1875 {
1876         DBusConnection *dconn;
1877         NTSTATUS status;
1878         char *conf_name;
1879         char *base_path;
1880         char *snap_path = NULL;
1881
1882         dconn = snapper_dbus_conn_create();
1883         if (dconn == NULL) {
1884                 status = NT_STATUS_UNSUCCESSFUL;
1885                 goto err_out;
1886         }
1887
1888         if (conn->connectpath == NULL) {
1889                 status = NT_STATUS_INVALID_PARAMETER;
1890                 goto err_conn_free;
1891         }
1892
1893         status = snapper_get_conf_call(mem_ctx, dconn,
1894                                        conn->connectpath,
1895                                        &conf_name,
1896                                        &base_path);
1897         if (!NT_STATUS_IS_OK(status)) {
1898                 goto err_conn_free;
1899         }
1900
1901         status = snapper_get_snap_at_time_call(mem_ctx, dconn,
1902                                                conf_name, base_path, snap_time,
1903                                                &snap_path);
1904         if (!NT_STATUS_IS_OK(status)) {
1905                 goto err_conf_name_free;
1906         }
1907
1908         /* confirm snapshot path is nested under base path */
1909         if (strncmp(snap_path, base_path, strlen(base_path)) != 0) {
1910                 status = NT_STATUS_INVALID_PARAMETER;
1911                 goto err_snap_path_free;
1912         }
1913
1914         talloc_free(conf_name);
1915         talloc_free(base_path);
1916         snapper_dbus_conn_destroy(dconn);
1917         *snap_dir_out = snap_path;
1918
1919         return NT_STATUS_OK;
1920
1921 err_snap_path_free:
1922         talloc_free(snap_path);
1923 err_conf_name_free:
1924         talloc_free(conf_name);
1925         talloc_free(base_path);
1926 err_conn_free:
1927         snapper_dbus_conn_destroy(dconn);
1928 err_out:
1929         return status;
1930 }
1931
1932 static char *snapper_gmt_convert(TALLOC_CTX *mem_ctx,
1933                              struct vfs_handle_struct *handle,
1934                              const char *name, time_t timestamp)
1935 {
1936         char *snap_path = NULL;
1937         char *path = NULL;
1938         NTSTATUS status;
1939         int saved_errno;
1940
1941         status = snapper_snap_path_expand(handle->conn, mem_ctx, timestamp,
1942                                           &snap_path);
1943         if (!NT_STATUS_IS_OK(status)) {
1944                 errno = map_errno_from_nt_status(status);
1945                 goto err_out;
1946         }
1947
1948         path = talloc_asprintf(mem_ctx, "%s/%s", snap_path, name);
1949         if (path == NULL) {
1950                 errno = ENOMEM;
1951                 goto err_snap_path_free;
1952         }
1953
1954         DEBUG(10, ("converted %s/%s @ time to %s\n",
1955                    handle->conn->connectpath, name, path));
1956         return path;
1957
1958 err_snap_path_free:
1959         saved_errno = errno;
1960         talloc_free(snap_path);
1961         errno = saved_errno;
1962 err_out:
1963         return NULL;
1964 }
1965
1966 static DIR *snapper_gmt_opendir(vfs_handle_struct *handle,
1967                                 const struct smb_filename *smb_fname,
1968                                 const char *mask,
1969                                 uint32_t attr)
1970 {
1971         time_t timestamp;
1972         char *stripped;
1973         DIR *ret;
1974         int saved_errno;
1975         char *conv;
1976         struct smb_filename *conv_smb_fname = NULL;
1977
1978         if (!snapper_gmt_strip_snapshot(talloc_tos(),
1979                         handle,
1980                         smb_fname->base_name,
1981                         &timestamp,
1982                         &stripped)) {
1983                 return NULL;
1984         }
1985         if (timestamp == 0) {
1986                 return SMB_VFS_NEXT_OPENDIR(handle, smb_fname, mask, attr);
1987         }
1988         conv = snapper_gmt_convert(talloc_tos(), handle, stripped, timestamp);
1989         TALLOC_FREE(stripped);
1990         if (conv == NULL) {
1991                 return NULL;
1992         }
1993         conv_smb_fname = synthetic_smb_fname(talloc_tos(),
1994                                         conv,
1995                                         NULL,
1996                                         NULL,
1997                                         smb_fname->flags);
1998         if (conv_smb_fname == NULL) {
1999                 TALLOC_FREE(conv);
2000                 errno = ENOMEM;
2001                 return NULL;
2002         }
2003
2004         ret = SMB_VFS_NEXT_OPENDIR(handle, conv_smb_fname, mask, attr);
2005         saved_errno = errno;
2006         TALLOC_FREE(conv);
2007         TALLOC_FREE(conv_smb_fname);
2008         errno = saved_errno;
2009         return ret;
2010 }
2011
2012 static int snapper_gmt_renameat(vfs_handle_struct *handle,
2013                         files_struct *srcfsp,
2014                         const struct smb_filename *smb_fname_src,
2015                         files_struct *dstfsp,
2016                         const struct smb_filename *smb_fname_dst)
2017 {
2018         time_t timestamp_src, timestamp_dst;
2019
2020         if (!snapper_gmt_strip_snapshot(talloc_tos(), handle,
2021                                         smb_fname_src->base_name,
2022                                         &timestamp_src, NULL)) {
2023                 return -1;
2024         }
2025         if (!snapper_gmt_strip_snapshot(talloc_tos(), handle,
2026                                         smb_fname_dst->base_name,
2027                                         &timestamp_dst, NULL)) {
2028                 return -1;
2029         }
2030         if (timestamp_src != 0) {
2031                 errno = EXDEV;
2032                 return -1;
2033         }
2034         if (timestamp_dst != 0) {
2035                 errno = EROFS;
2036                 return -1;
2037         }
2038         return SMB_VFS_NEXT_RENAMEAT(handle,
2039                         srcfsp,
2040                         smb_fname_src,
2041                         dstfsp,
2042                         smb_fname_dst);
2043 }
2044
2045 static int snapper_gmt_symlinkat(vfs_handle_struct *handle,
2046                                 const char *link_contents,
2047                                 struct files_struct *dirfsp,
2048                                 const struct smb_filename *new_smb_fname)
2049 {
2050         time_t timestamp_old = 0;
2051         time_t timestamp_new = 0;
2052
2053         if (!snapper_gmt_strip_snapshot(talloc_tos(),
2054                                 handle,
2055                                 link_contents,
2056                                 &timestamp_old,
2057                                 NULL)) {
2058                 return -1;
2059         }
2060         if (!snapper_gmt_strip_snapshot(talloc_tos(),
2061                                 handle,
2062                                 new_smb_fname->base_name,
2063                                 &timestamp_new,
2064                                 NULL)) {
2065                 return -1;
2066         }
2067         if ((timestamp_old != 0) || (timestamp_new != 0)) {
2068                 errno = EROFS;
2069                 return -1;
2070         }
2071         return SMB_VFS_NEXT_SYMLINKAT(handle,
2072                         link_contents,
2073                         dirfsp,
2074                         new_smb_fname);
2075 }
2076
2077 static int snapper_gmt_linkat(vfs_handle_struct *handle,
2078                                 files_struct *srcfsp,
2079                                 const struct smb_filename *old_smb_fname,
2080                                 files_struct *dstfsp,
2081                                 const struct smb_filename *new_smb_fname,
2082                                 int flags)
2083 {
2084         time_t timestamp_old = 0;
2085         time_t timestamp_new = 0;
2086
2087         if (!snapper_gmt_strip_snapshot(talloc_tos(),
2088                                 handle,
2089                                 old_smb_fname->base_name,
2090                                 &timestamp_old,
2091                                 NULL)) {
2092                 return -1;
2093         }
2094         if (!snapper_gmt_strip_snapshot(talloc_tos(),
2095                                 handle,
2096                                 new_smb_fname->base_name,
2097                                 &timestamp_new,
2098                                 NULL)) {
2099                 return -1;
2100         }
2101         if ((timestamp_old != 0) || (timestamp_new != 0)) {
2102                 errno = EROFS;
2103                 return -1;
2104         }
2105         return SMB_VFS_NEXT_LINKAT(handle,
2106                                 srcfsp,
2107                                 old_smb_fname,
2108                                 dstfsp,
2109                                 new_smb_fname,
2110                                 flags);
2111 }
2112
2113 static int snapper_gmt_stat(vfs_handle_struct *handle,
2114                             struct smb_filename *smb_fname)
2115 {
2116         time_t timestamp;
2117         char *stripped, *tmp;
2118         int ret, saved_errno;
2119
2120         if (!snapper_gmt_strip_snapshot(talloc_tos(), handle,
2121                                         smb_fname->base_name,
2122                                         &timestamp, &stripped)) {
2123                 return -1;
2124         }
2125         if (timestamp == 0) {
2126                 return SMB_VFS_NEXT_STAT(handle, smb_fname);
2127         }
2128
2129         tmp = smb_fname->base_name;
2130         smb_fname->base_name = snapper_gmt_convert(talloc_tos(), handle,
2131                                                    stripped, timestamp);
2132         TALLOC_FREE(stripped);
2133
2134         if (smb_fname->base_name == NULL) {
2135                 smb_fname->base_name = tmp;
2136                 return -1;
2137         }
2138
2139         ret = SMB_VFS_NEXT_STAT(handle, smb_fname);
2140         saved_errno = errno;
2141
2142         TALLOC_FREE(smb_fname->base_name);
2143         smb_fname->base_name = tmp;
2144
2145         errno = saved_errno;
2146         return ret;
2147 }
2148
2149 static int snapper_gmt_lstat(vfs_handle_struct *handle,
2150                              struct smb_filename *smb_fname)
2151 {
2152         time_t timestamp;
2153         char *stripped, *tmp;
2154         int ret, saved_errno;
2155
2156         if (!snapper_gmt_strip_snapshot(talloc_tos(), handle,
2157                                         smb_fname->base_name,
2158                                         &timestamp, &stripped)) {
2159                 return -1;
2160         }
2161         if (timestamp == 0) {
2162                 return SMB_VFS_NEXT_LSTAT(handle, smb_fname);
2163         }
2164
2165         tmp = smb_fname->base_name;
2166         smb_fname->base_name = snapper_gmt_convert(talloc_tos(), handle,
2167                                                    stripped, timestamp);
2168         TALLOC_FREE(stripped);
2169
2170         if (smb_fname->base_name == NULL) {
2171                 smb_fname->base_name = tmp;
2172                 return -1;
2173         }
2174
2175         ret = SMB_VFS_NEXT_LSTAT(handle, smb_fname);
2176         saved_errno = errno;
2177
2178         TALLOC_FREE(smb_fname->base_name);
2179         smb_fname->base_name = tmp;
2180
2181         errno = saved_errno;
2182         return ret;
2183 }
2184
2185 static int snapper_gmt_open(vfs_handle_struct *handle,
2186                             struct smb_filename *smb_fname, files_struct *fsp,
2187                             int flags, mode_t mode)
2188 {
2189         time_t timestamp;
2190         char *stripped, *tmp;
2191         int ret, saved_errno;
2192
2193         if (!snapper_gmt_strip_snapshot(talloc_tos(), handle,
2194                                         smb_fname->base_name,
2195                                         &timestamp, &stripped)) {
2196                 return -1;
2197         }
2198         if (timestamp == 0) {
2199                 return SMB_VFS_NEXT_OPEN(handle, smb_fname, fsp, flags, mode);
2200         }
2201
2202         tmp = smb_fname->base_name;
2203         smb_fname->base_name = snapper_gmt_convert(talloc_tos(), handle,
2204                                                    stripped, timestamp);
2205         TALLOC_FREE(stripped);
2206
2207         if (smb_fname->base_name == NULL) {
2208                 smb_fname->base_name = tmp;
2209                 return -1;
2210         }
2211
2212         ret = SMB_VFS_NEXT_OPEN(handle, smb_fname, fsp, flags, mode);
2213         saved_errno = errno;
2214
2215         TALLOC_FREE(smb_fname->base_name);
2216         smb_fname->base_name = tmp;
2217
2218         errno = saved_errno;
2219         return ret;
2220 }
2221
2222 static int snapper_gmt_unlink(vfs_handle_struct *handle,
2223                               const struct smb_filename *smb_fname)
2224 {
2225         time_t timestamp = 0;
2226
2227         if (!snapper_gmt_strip_snapshot(talloc_tos(), handle,
2228                                         smb_fname->base_name,
2229                                         &timestamp, NULL)) {
2230                 return -1;
2231         }
2232         if (timestamp != 0) {
2233                 errno = EROFS;
2234                 return -1;
2235         }
2236         return SMB_VFS_NEXT_UNLINK(handle, smb_fname);
2237 }
2238
2239 static int snapper_gmt_chmod(vfs_handle_struct *handle,
2240                         const struct smb_filename *smb_fname,
2241                         mode_t mode)
2242 {
2243         time_t timestamp = 0;
2244
2245         if (!snapper_gmt_strip_snapshot(talloc_tos(),
2246                                 handle,
2247                                 smb_fname->base_name,
2248                                 &timestamp,
2249                                 NULL)) {
2250                 return -1;
2251         }
2252         if (timestamp != 0) {
2253                 errno = EROFS;
2254                 return -1;
2255         }
2256         return SMB_VFS_NEXT_CHMOD(handle, smb_fname, mode);
2257 }
2258
2259 static int snapper_gmt_chown(vfs_handle_struct *handle,
2260                         const struct smb_filename *smb_fname,
2261                         uid_t uid,
2262                         gid_t gid)
2263 {
2264         time_t timestamp = 0;
2265
2266         if (!snapper_gmt_strip_snapshot(talloc_tos(),
2267                                 handle,
2268                                 smb_fname->base_name,
2269                                 &timestamp,
2270                                 NULL)) {
2271                 return -1;
2272         }
2273         if (timestamp != 0) {
2274                 errno = EROFS;
2275                 return -1;
2276         }
2277         return SMB_VFS_NEXT_CHOWN(handle, smb_fname, uid, gid);
2278 }
2279
2280 static int snapper_gmt_chdir(vfs_handle_struct *handle,
2281                         const struct smb_filename *smb_fname)
2282 {
2283         time_t timestamp = 0;
2284         char *stripped = NULL;
2285         int ret;
2286         int saved_errno = 0;
2287         char *conv = NULL;
2288         struct smb_filename *conv_smb_fname = NULL;
2289
2290         if (!snapper_gmt_strip_snapshot(talloc_tos(),
2291                                 handle,
2292                                 smb_fname->base_name,
2293                                 &timestamp,
2294                                 &stripped)) {
2295                 return -1;
2296         }
2297         if (timestamp == 0) {
2298                 return SMB_VFS_NEXT_CHDIR(handle, smb_fname);
2299         }
2300         conv = snapper_gmt_convert(talloc_tos(), handle, stripped, timestamp);
2301         TALLOC_FREE(stripped);
2302         if (conv == NULL) {
2303                 return -1;
2304         }
2305         conv_smb_fname = synthetic_smb_fname(talloc_tos(),
2306                                         conv,
2307                                         NULL,
2308                                         NULL,
2309                                         smb_fname->flags);
2310         if (conv_smb_fname == NULL) {
2311                 TALLOC_FREE(conv);
2312                 errno = ENOMEM;
2313                 return -1;
2314         }
2315         ret = SMB_VFS_NEXT_CHDIR(handle, conv_smb_fname);
2316         if (ret == -1) {
2317                 saved_errno = errno;
2318         }
2319         TALLOC_FREE(conv);
2320         TALLOC_FREE(conv_smb_fname);
2321         if (saved_errno != 0) {
2322                 errno = saved_errno;
2323         }
2324         return ret;
2325 }
2326
2327 static int snapper_gmt_ntimes(vfs_handle_struct *handle,
2328                               const struct smb_filename *smb_fname,
2329                               struct smb_file_time *ft)
2330 {
2331         time_t timestamp = 0;
2332
2333         if (!snapper_gmt_strip_snapshot(talloc_tos(), handle,
2334                                         smb_fname->base_name,
2335                                         &timestamp, NULL)) {
2336                 return -1;
2337         }
2338         if (timestamp != 0) {
2339                 errno = EROFS;
2340                 return -1;
2341         }
2342         return SMB_VFS_NEXT_NTIMES(handle, smb_fname, ft);
2343 }
2344
2345 static int snapper_gmt_readlinkat(vfs_handle_struct *handle,
2346                                 files_struct *dirfsp,
2347                                 const struct smb_filename *smb_fname,
2348                                 char *buf,
2349                                 size_t bufsiz)
2350 {
2351         time_t timestamp = 0;
2352         char *stripped = NULL;
2353         int ret;
2354         int saved_errno = 0;
2355         struct smb_filename *conv = NULL;
2356
2357         if (!snapper_gmt_strip_snapshot(talloc_tos(), handle,
2358                                         smb_fname->base_name,
2359                                         &timestamp, &stripped)) {
2360                 return -1;
2361         }
2362         if (timestamp == 0) {
2363                 return SMB_VFS_NEXT_READLINKAT(handle,
2364                                 dirfsp,
2365                                 smb_fname,
2366                                 buf,
2367                                 bufsiz);
2368         }
2369         conv = cp_smb_filename(talloc_tos(), smb_fname);
2370         if (conv == NULL) {
2371                 TALLOC_FREE(stripped);
2372                 errno = ENOMEM;
2373                 return -1;
2374         }
2375         conv->base_name = snapper_gmt_convert(conv, handle,
2376                                               stripped, timestamp);
2377         TALLOC_FREE(stripped);
2378         if (conv->base_name == NULL) {
2379                 return -1;
2380         }
2381         ret = SMB_VFS_NEXT_READLINKAT(handle,
2382                                 dirfsp,
2383                                 conv,
2384                                 buf,
2385                                 bufsiz);
2386         if (ret == -1) {
2387                 saved_errno = errno;
2388         }
2389         TALLOC_FREE(conv);
2390         if (saved_errno != 0) {
2391                 errno = saved_errno;
2392         }
2393         return ret;
2394 }
2395
2396 static int snapper_gmt_mknodat(vfs_handle_struct *handle,
2397                         files_struct *dirfsp,
2398                         const struct smb_filename *smb_fname,
2399                         mode_t mode,
2400                         SMB_DEV_T dev)
2401 {
2402         time_t timestamp = (time_t)0;
2403
2404         if (!snapper_gmt_strip_snapshot(talloc_tos(), handle,
2405                                         smb_fname->base_name,
2406                                         &timestamp, NULL)) {
2407                 return -1;
2408         }
2409         if (timestamp != 0) {
2410                 errno = EROFS;
2411                 return -1;
2412         }
2413         return SMB_VFS_NEXT_MKNODAT(handle,
2414                         dirfsp,
2415                         smb_fname,
2416                         mode,
2417                         dev);
2418 }
2419
2420 static struct smb_filename *snapper_gmt_realpath(vfs_handle_struct *handle,
2421                                 TALLOC_CTX *ctx,
2422                                 const struct smb_filename *smb_fname)
2423 {
2424         time_t timestamp = 0;
2425         char *stripped = NULL;
2426         struct smb_filename *result_fname = NULL;
2427         struct smb_filename *conv_smb_fname = NULL;
2428         int saved_errno = 0;
2429
2430         if (!snapper_gmt_strip_snapshot(talloc_tos(), handle,
2431                                         smb_fname->base_name,
2432                                         &timestamp, &stripped)) {
2433                 goto done;
2434         }
2435         if (timestamp == 0) {
2436                 return SMB_VFS_NEXT_REALPATH(handle, ctx, smb_fname);
2437         }
2438
2439         conv_smb_fname = cp_smb_filename(talloc_tos(), smb_fname);
2440         if (conv_smb_fname == NULL) {
2441                 goto done;
2442         }
2443         conv_smb_fname->base_name = snapper_gmt_convert(conv_smb_fname, handle,
2444                                               stripped, timestamp);
2445         if (conv_smb_fname->base_name == NULL) {
2446                 goto done;
2447         }
2448
2449         result_fname = SMB_VFS_NEXT_REALPATH(handle, ctx, conv_smb_fname);
2450
2451 done:
2452         if (result_fname == NULL) {
2453                 saved_errno = errno;
2454         }
2455         TALLOC_FREE(conv_smb_fname);
2456         TALLOC_FREE(stripped);
2457         if (saved_errno != 0) {
2458                 errno = saved_errno;
2459         }
2460         return result_fname;
2461 }
2462
2463 static NTSTATUS snapper_gmt_fget_nt_acl(vfs_handle_struct *handle,
2464                                         struct files_struct *fsp,
2465                                         uint32_t security_info,
2466                                         TALLOC_CTX *mem_ctx,
2467                                         struct security_descriptor **ppdesc)
2468 {
2469         time_t timestamp;
2470         char *stripped;
2471         NTSTATUS status;
2472         char *conv;
2473         struct smb_filename *smb_fname = NULL;
2474
2475         if (!snapper_gmt_strip_snapshot(talloc_tos(), handle,
2476                                         fsp->fsp_name->base_name,
2477                                         &timestamp, &stripped)) {
2478                 return map_nt_error_from_unix(errno);
2479         }
2480         if (timestamp == 0) {
2481                 return SMB_VFS_NEXT_FGET_NT_ACL(handle, fsp, security_info,
2482                                                 mem_ctx,
2483                                                 ppdesc);
2484         }
2485         conv = snapper_gmt_convert(talloc_tos(), handle, stripped, timestamp);
2486         TALLOC_FREE(stripped);
2487         if (conv == NULL) {
2488                 return map_nt_error_from_unix(errno);
2489         }
2490
2491         smb_fname = synthetic_smb_fname(talloc_tos(),
2492                                         conv,
2493                                         NULL,
2494                                         NULL,
2495                                         fsp->fsp_name->flags);
2496         TALLOC_FREE(conv);
2497         if (smb_fname == NULL) {
2498                 return NT_STATUS_NO_MEMORY;
2499         }
2500
2501         status = SMB_VFS_NEXT_GET_NT_ACL(handle, smb_fname, security_info,
2502                                          mem_ctx, ppdesc);
2503         TALLOC_FREE(smb_fname);
2504         return status;
2505 }
2506
2507 static NTSTATUS snapper_gmt_get_nt_acl(vfs_handle_struct *handle,
2508                                        const struct smb_filename *fname,
2509                                        uint32_t security_info,
2510                                        TALLOC_CTX *mem_ctx,
2511                                        struct security_descriptor **ppdesc)
2512 {
2513         time_t timestamp;
2514         char *stripped;
2515         NTSTATUS status;
2516         char *conv;
2517         struct smb_filename *smb_fname = NULL;
2518
2519         if (!snapper_gmt_strip_snapshot(talloc_tos(), handle, fname->base_name,
2520                                         &timestamp, &stripped)) {
2521                 return map_nt_error_from_unix(errno);
2522         }
2523         if (timestamp == 0) {
2524                 return SMB_VFS_NEXT_GET_NT_ACL(handle, fname, security_info,
2525                                                mem_ctx, ppdesc);
2526         }
2527         conv = snapper_gmt_convert(talloc_tos(), handle, stripped, timestamp);
2528         TALLOC_FREE(stripped);
2529         if (conv == NULL) {
2530                 return map_nt_error_from_unix(errno);
2531         }
2532         smb_fname = synthetic_smb_fname(talloc_tos(),
2533                                         conv,
2534                                         NULL,
2535                                         NULL,
2536                                         fname->flags);
2537         TALLOC_FREE(conv);
2538         if (smb_fname == NULL) {
2539                 return NT_STATUS_NO_MEMORY;
2540         }
2541
2542         status = SMB_VFS_NEXT_GET_NT_ACL(handle, smb_fname, security_info,
2543                                          mem_ctx, ppdesc);
2544         TALLOC_FREE(smb_fname);
2545         return status;
2546 }
2547
2548 static int snapper_gmt_mkdirat(vfs_handle_struct *handle,
2549                                 struct files_struct *dirfsp,
2550                                 const struct smb_filename *fname,
2551                                 mode_t mode)
2552 {
2553         time_t timestamp = 0;
2554
2555         if (!snapper_gmt_strip_snapshot(talloc_tos(), handle, fname->base_name,
2556                                         &timestamp, NULL)) {
2557                 return -1;
2558         }
2559         if (timestamp != 0) {
2560                 errno = EROFS;
2561                 return -1;
2562         }
2563         return SMB_VFS_NEXT_MKDIRAT(handle,
2564                         dirfsp,
2565                         fname,
2566                         mode);
2567 }
2568
2569 static int snapper_gmt_rmdir(vfs_handle_struct *handle,
2570                                 const struct smb_filename *fname)
2571 {
2572         time_t timestamp = 0;
2573
2574         if (!snapper_gmt_strip_snapshot(talloc_tos(), handle, fname->base_name,
2575                                         &timestamp, NULL)) {
2576                 return -1;
2577         }
2578         if (timestamp != 0) {
2579                 errno = EROFS;
2580                 return -1;
2581         }
2582         return SMB_VFS_NEXT_RMDIR(handle, fname);
2583 }
2584
2585 static int snapper_gmt_chflags(vfs_handle_struct *handle,
2586                                 const struct smb_filename *smb_fname,
2587                                 unsigned int flags)
2588 {
2589         time_t timestamp = 0;
2590
2591         if (!snapper_gmt_strip_snapshot(talloc_tos(), handle,
2592                                 smb_fname->base_name, &timestamp, NULL)) {
2593                 return -1;
2594         }
2595         if (timestamp != 0) {
2596                 errno = EROFS;
2597                 return -1;
2598         }
2599         return SMB_VFS_NEXT_CHFLAGS(handle, smb_fname, flags);
2600 }
2601
2602 static ssize_t snapper_gmt_getxattr(vfs_handle_struct *handle,
2603                                 const struct smb_filename *smb_fname,
2604                                 const char *aname,
2605                                 void *value,
2606                                 size_t size)
2607 {
2608         time_t timestamp = 0;
2609         char *stripped = NULL;
2610         ssize_t ret;
2611         int saved_errno = 0;
2612         char *conv = NULL;
2613         struct smb_filename *conv_smb_fname = NULL;
2614
2615         if (!snapper_gmt_strip_snapshot(talloc_tos(),
2616                                         handle,
2617                                         smb_fname->base_name,
2618                                         &timestamp,
2619                                         &stripped)) {
2620                 return -1;
2621         }
2622         if (timestamp == 0) {
2623                 return SMB_VFS_NEXT_GETXATTR(handle, smb_fname, aname, value,
2624                                              size);
2625         }
2626         conv = snapper_gmt_convert(talloc_tos(), handle, stripped, timestamp);
2627         TALLOC_FREE(stripped);
2628         if (conv == NULL) {
2629                 return -1;
2630         }
2631         conv_smb_fname = synthetic_smb_fname(talloc_tos(),
2632                                         conv,
2633                                         NULL,
2634                                         NULL,
2635                                         smb_fname->flags);
2636         TALLOC_FREE(conv);
2637         if (conv_smb_fname == NULL) {
2638                 errno = ENOMEM;
2639                 return -1;
2640         }
2641         ret = SMB_VFS_NEXT_GETXATTR(handle, conv_smb_fname, aname, value, size);
2642         if (ret == -1) {
2643                 saved_errno = errno;
2644         }
2645         TALLOC_FREE(conv_smb_fname);
2646         TALLOC_FREE(conv);
2647         if (saved_errno != 0) {
2648                 errno = saved_errno;
2649         }
2650         return ret;
2651 }
2652
2653 static ssize_t snapper_gmt_listxattr(struct vfs_handle_struct *handle,
2654                                      const struct smb_filename *smb_fname,
2655                                      char *list, size_t size)
2656 {
2657         time_t timestamp = 0;
2658         char *stripped = NULL;
2659         ssize_t ret;
2660         int saved_errno = 0;
2661         char *conv = NULL;
2662         struct smb_filename *conv_smb_fname = NULL;
2663
2664         if (!snapper_gmt_strip_snapshot(talloc_tos(),
2665                                         handle,
2666                                         smb_fname->base_name,
2667                                         &timestamp,
2668                                         &stripped)) {
2669                 return -1;
2670         }
2671         if (timestamp == 0) {
2672                 return SMB_VFS_NEXT_LISTXATTR(handle, smb_fname, list, size);
2673         }
2674         conv = snapper_gmt_convert(talloc_tos(), handle, stripped, timestamp);
2675         TALLOC_FREE(stripped);
2676         if (conv == NULL) {
2677                 return -1;
2678         }
2679         conv_smb_fname = synthetic_smb_fname(talloc_tos(),
2680                                         conv,
2681                                         NULL,
2682                                         NULL,
2683                                         smb_fname->flags);
2684         TALLOC_FREE(conv);
2685         if (conv_smb_fname == NULL) {
2686                 errno = ENOMEM;
2687                 return -1;
2688         }
2689         ret = SMB_VFS_NEXT_LISTXATTR(handle, conv_smb_fname, list, size);
2690         if (ret == -1) {
2691                 saved_errno = errno;
2692         }
2693         TALLOC_FREE(conv_smb_fname);
2694         TALLOC_FREE(conv);
2695         if (saved_errno != 0) {
2696                 errno = saved_errno;
2697         }
2698         return ret;
2699 }
2700
2701 static int snapper_gmt_removexattr(vfs_handle_struct *handle,
2702                                 const struct smb_filename *smb_fname,
2703                                 const char *aname)
2704 {
2705         time_t timestamp = 0;
2706
2707         if (!snapper_gmt_strip_snapshot(talloc_tos(),
2708                                         handle,
2709                                         smb_fname->base_name,
2710                                         &timestamp,
2711                                         NULL)) {
2712                 return -1;
2713         }
2714         if (timestamp != 0) {
2715                 errno = EROFS;
2716                 return -1;
2717         }
2718         return SMB_VFS_NEXT_REMOVEXATTR(handle, smb_fname, aname);
2719 }
2720
2721 static int snapper_gmt_setxattr(struct vfs_handle_struct *handle,
2722                                 const struct smb_filename *smb_fname,
2723                                 const char *aname, const void *value,
2724                                 size_t size, int flags)
2725 {
2726         time_t timestamp = 0;
2727
2728         if (!snapper_gmt_strip_snapshot(talloc_tos(),
2729                                         handle,
2730                                         smb_fname->base_name,
2731                                         &timestamp,
2732                                         NULL)) {
2733                 return -1;
2734         }
2735         if (timestamp != 0) {
2736                 errno = EROFS;
2737                 return -1;
2738         }
2739         return SMB_VFS_NEXT_SETXATTR(handle, smb_fname,
2740                                 aname, value, size, flags);
2741 }
2742
2743 static int snapper_gmt_get_real_filename(struct vfs_handle_struct *handle,
2744                                          const char *path,
2745                                          const char *name,
2746                                          TALLOC_CTX *mem_ctx,
2747                                          char **found_name)
2748 {
2749         time_t timestamp;
2750         char *stripped;
2751         ssize_t ret;
2752         int saved_errno;
2753         char *conv;
2754
2755         if (!snapper_gmt_strip_snapshot(talloc_tos(), handle, path,
2756                                         &timestamp, &stripped)) {
2757                 return -1;
2758         }
2759         if (timestamp == 0) {
2760                 return SMB_VFS_NEXT_GET_REAL_FILENAME(handle, path, name,
2761                                                       mem_ctx, found_name);
2762         }
2763         if (stripped[0] == '\0') {
2764                 *found_name = talloc_strdup(mem_ctx, name);
2765                 if (*found_name == NULL) {
2766                         errno = ENOMEM;
2767                         return -1;
2768                 }
2769                 return 0;
2770         }
2771         conv = snapper_gmt_convert(talloc_tos(), handle, stripped, timestamp);
2772         TALLOC_FREE(stripped);
2773         if (conv == NULL) {
2774                 return -1;
2775         }
2776         ret = SMB_VFS_NEXT_GET_REAL_FILENAME(handle, conv, name,
2777                                              mem_ctx, found_name);
2778         saved_errno = errno;
2779         TALLOC_FREE(conv);
2780         errno = saved_errno;
2781         return ret;
2782 }
2783
2784 static uint64_t snapper_gmt_disk_free(vfs_handle_struct *handle,
2785                                 const struct smb_filename *smb_fname,
2786                                 uint64_t *bsize,
2787                                 uint64_t *dfree,
2788                                 uint64_t *dsize)
2789 {
2790         time_t timestamp = 0;
2791         char *stripped = NULL;
2792         uint64_t ret;
2793         int saved_errno = 0;
2794         char *conv = NULL;
2795         struct smb_filename *conv_smb_fname = NULL;
2796
2797         if (!snapper_gmt_strip_snapshot(talloc_tos(), handle,
2798                         smb_fname->base_name, &timestamp, &stripped)) {
2799                 return (uint64_t)-1;
2800         }
2801         if (timestamp == 0) {
2802                 return SMB_VFS_NEXT_DISK_FREE(handle, smb_fname,
2803                                               bsize, dfree, dsize);
2804         }
2805
2806         conv = snapper_gmt_convert(talloc_tos(), handle, stripped, timestamp);
2807         TALLOC_FREE(stripped);
2808         if (conv == NULL) {
2809                 return (uint64_t)-1;
2810         }
2811         conv_smb_fname = synthetic_smb_fname(talloc_tos(),
2812                                         conv,
2813                                         NULL,
2814                                         NULL,
2815                                         smb_fname->flags);
2816         if (conv_smb_fname == NULL) {
2817                 TALLOC_FREE(conv);
2818                 errno = ENOMEM;
2819                 return (uint64_t)-1;
2820         }
2821
2822         ret = SMB_VFS_NEXT_DISK_FREE(handle, conv_smb_fname,
2823                                 bsize, dfree, dsize);
2824
2825         if (ret == (uint64_t)-1) {
2826                 saved_errno = errno;
2827         }
2828         TALLOC_FREE(conv_smb_fname);
2829         if (saved_errno != 0) {
2830                 errno = saved_errno;
2831         }
2832         return ret;
2833 }
2834
2835 static int snapper_gmt_get_quota(vfs_handle_struct *handle,
2836                         const struct smb_filename *smb_fname,
2837                         enum SMB_QUOTA_TYPE qtype,
2838                         unid_t id,
2839                         SMB_DISK_QUOTA *dq)
2840 {
2841         time_t timestamp = 0;
2842         char *stripped = NULL;
2843         int ret;
2844         int saved_errno = 0;
2845         char *conv = NULL;
2846         struct smb_filename *conv_smb_fname = NULL;
2847
2848         if (!snapper_gmt_strip_snapshot(talloc_tos(), handle,
2849                                 smb_fname->base_name, &timestamp, &stripped)) {
2850                 return -1;
2851         }
2852         if (timestamp == 0) {
2853                 return SMB_VFS_NEXT_GET_QUOTA(handle, smb_fname, qtype, id, dq);
2854         }
2855
2856         conv = snapper_gmt_convert(talloc_tos(), handle, stripped, timestamp);
2857         TALLOC_FREE(stripped);
2858         if (conv == NULL) {
2859                 return -1;
2860         }
2861         conv_smb_fname = synthetic_smb_fname(talloc_tos(),
2862                                         conv,
2863                                         NULL,
2864                                         NULL,
2865                                         smb_fname->flags);
2866         TALLOC_FREE(conv);
2867         if (conv_smb_fname == NULL) {
2868                 errno = ENOMEM;
2869                 return -1;
2870         }
2871
2872         ret = SMB_VFS_NEXT_GET_QUOTA(handle, conv_smb_fname, qtype, id, dq);
2873
2874         if (ret == -1) {
2875                 saved_errno = errno;
2876         }
2877         TALLOC_FREE(conv_smb_fname);
2878         if (saved_errno != 0) {
2879                 errno = saved_errno;
2880         }
2881         return ret;
2882 }
2883
2884
2885 static struct vfs_fn_pointers snapper_fns = {
2886         .snap_check_path_fn = snapper_snap_check_path,
2887         .snap_create_fn = snapper_snap_create,
2888         .snap_delete_fn = snapper_snap_delete,
2889         .get_shadow_copy_data_fn = snapper_get_shadow_copy_data,
2890         .opendir_fn = snapper_gmt_opendir,
2891         .disk_free_fn = snapper_gmt_disk_free,
2892         .get_quota_fn = snapper_gmt_get_quota,
2893         .renameat_fn = snapper_gmt_renameat,
2894         .linkat_fn = snapper_gmt_linkat,
2895         .symlinkat_fn = snapper_gmt_symlinkat,
2896         .stat_fn = snapper_gmt_stat,
2897         .lstat_fn = snapper_gmt_lstat,
2898         .open_fn = snapper_gmt_open,
2899         .unlink_fn = snapper_gmt_unlink,
2900         .chmod_fn = snapper_gmt_chmod,
2901         .chown_fn = snapper_gmt_chown,
2902         .chdir_fn = snapper_gmt_chdir,
2903         .ntimes_fn = snapper_gmt_ntimes,
2904         .readlinkat_fn = snapper_gmt_readlinkat,
2905         .mknodat_fn = snapper_gmt_mknodat,
2906         .realpath_fn = snapper_gmt_realpath,
2907         .get_nt_acl_fn = snapper_gmt_get_nt_acl,
2908         .fget_nt_acl_fn = snapper_gmt_fget_nt_acl,
2909         .mkdirat_fn = snapper_gmt_mkdirat,
2910         .rmdir_fn = snapper_gmt_rmdir,
2911         .getxattr_fn = snapper_gmt_getxattr,
2912         .getxattrat_send_fn = vfs_not_implemented_getxattrat_send,
2913         .getxattrat_recv_fn = vfs_not_implemented_getxattrat_recv,
2914         .listxattr_fn = snapper_gmt_listxattr,
2915         .removexattr_fn = snapper_gmt_removexattr,
2916         .setxattr_fn = snapper_gmt_setxattr,
2917         .chflags_fn = snapper_gmt_chflags,
2918         .get_real_filename_fn = snapper_gmt_get_real_filename,
2919 };
2920
2921 static_decl_vfs;
2922 NTSTATUS vfs_snapper_init(TALLOC_CTX *ctx)
2923 {
2924         return smb_register_vfs(SMB_VFS_INTERFACE_VERSION,
2925                                 "snapper", &snapper_fns);
2926 }