main.c

   1 /*
   2  * The startup routines, including main(), for rsync.
   3  *
   4  * Copyright (C) 1996-2001 Andrew Tridgell <tridge@samba.org>
   5  * Copyright (C) 1996 Paul Mackerras
   6  * Copyright (C) 2001, 2002 Martin Pool <mbp@samba.org>
   7  * Copyright (C) 2003-2009 Wayne Davison
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 3 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License along
  20  * with this program; if not, visit the http://fsf.org website.
  21  */
  22
  23 #include "rsync.h"
  24 #include "inums.h"
  25 #include "io.h"
  26 #if defined CONFIG_LOCALE && defined HAVE_LOCALE_H
  27 #include <locale.h>
  28 #endif
  29
  30 extern int dry_run;
  31 extern int list_only;
  32 extern int io_timeout;
  33 extern int am_root;
  34 extern int am_server;
  35 extern int am_sender;
  36 extern int am_daemon;
  37 extern int inc_recurse;
  38 extern int blocking_io;
  39 extern int always_checksum;
  40 extern int remove_source_files;
  41 extern int output_needs_newline;
  42 extern int need_messages_from_generator;
  43 extern int kluge_around_eof;
  44 extern int got_xfer_error;
  45 extern int msgs2stderr;
  46 extern int module_id;
  47 extern int read_only;
  48 extern int copy_links;
  49 extern int copy_dirlinks;
  50 extern int copy_unsafe_links;
  51 extern int keep_dirlinks;
  52 extern int preserve_hard_links;
  53 extern int protocol_version;
  54 extern int file_total;
  55 extern int recurse;
  56 extern int xfer_dirs;
  57 extern int protect_args;
  58 extern int relative_paths;
  59 extern int sanitize_paths;
  60 extern int curr_dir_depth;
  61 extern int curr_dir_len;
  62 extern int module_id;
  63 extern int rsync_port;
  64 extern int whole_file;
  65 extern int read_batch;
  66 extern int write_batch;
  67 extern int batch_fd;
  68 extern int sock_f_in;
  69 extern int sock_f_out;
  70 extern int filesfrom_fd;
  71 extern int connect_timeout;
  72 extern int send_msgs_to_gen;
  73 extern dev_t filesystem_dev;
  74 extern pid_t cleanup_child_pid;
  75 extern size_t bwlimit_writemax;
  76 extern unsigned int module_dirlen;
  77 extern BOOL flist_receiving_enabled;
  78 extern BOOL shutting_down;
  79 extern struct stats stats;
  80 extern char *stdout_format;
  81 extern char *logfile_format;
  82 extern char *filesfrom_host;
  83 extern char *partial_dir;
  84 extern char *dest_option;
  85 extern char *rsync_path;
  86 extern char *shell_cmd;
  87 extern char *batch_name;
  88 extern char *password_file;
  89 extern char *backup_dir;
  90 extern char curr_dir[MAXPATHLEN];
  91 extern char backup_dir_buf[MAXPATHLEN];
  92 extern char *basis_dir[MAX_BASIS_DIRS+1];
  93 extern struct file_list *first_flist;
  94 extern filter_rule_list daemon_filter_list;
  95
  96 uid_t our_uid;
  97 gid_t our_gid;
  98 int am_receiver = 0;  /* Only set to 1 after the receiver/generator fork. */
  99 int am_generator = 0; /* Only set to 1 after the receiver/generator fork. */
 100 int local_server = 0;
 101 int daemon_over_rsh = 0;
 102 mode_t orig_umask = 0;
 103 int batch_gen_fd = -1;
 104 int sender_keeps_checksum = 0;
 105
 106 /* There's probably never more than at most 2 outstanding child processes,
 107  * but set it higher, just in case. */
 108 #define MAXCHILDPROCS 7
 109
 110 #ifdef HAVE_SIGACTION
 111 # ifdef HAVE_SIGPROCMASK
 112 #  define SIGACTMASK(n,h) SIGACTION(n,h), sigaddset(&sigmask,(n))
 113 # else
 114 #  define SIGACTMASK(n,h) SIGACTION(n,h)
 115 # endif
 116 static struct sigaction sigact;
 117 #endif
 118
 119 struct pid_status {
 120         pid_t pid;
 121         int status;
 122 } pid_stat_table[MAXCHILDPROCS];
 123
 124 static time_t starttime, endtime;
 125 static int64 total_read, total_written;
 126
 127 static void show_malloc_stats(void);
 128
 129 /* Works like waitpid(), but if we already harvested the child pid in our
 130  * remember_children(), we succeed instead of returning an error. */
 131 pid_t wait_process(pid_t pid, int *status_ptr, int flags)
 132 {
 133         pid_t waited_pid;
 134
 135         do {
 136                 waited_pid = waitpid(pid, status_ptr, flags);
 137         } while (waited_pid == -1 && errno == EINTR);
 138
 139         if (waited_pid == -1 && errno == ECHILD) {
 140                 /* Status of requested child no longer available:  check to
 141                  * see if it was processed by remember_children(). */
 142                 int cnt;
 143                 for (cnt = 0; cnt < MAXCHILDPROCS; cnt++) {
 144                         if (pid == pid_stat_table[cnt].pid) {
 145                                 *status_ptr = pid_stat_table[cnt].status;
 146                                 pid_stat_table[cnt].pid = 0;
 147                                 return pid;
 148                         }
 149                 }
 150         }
 151
 152         return waited_pid;
 153 }
 154
 155 /* Wait for a process to exit, calling io_flush while waiting. */
 156 static void wait_process_with_flush(pid_t pid, int *exit_code_ptr)
 157 {
 158         pid_t waited_pid;
 159         int status;
 160
 161         while ((waited_pid = wait_process(pid, &status, WNOHANG)) == 0) {
 162                 msleep(20);
 163                 io_flush(FULL_FLUSH);
 164         }
 165
 166         /* TODO: If the child exited on a signal, then log an
 167          * appropriate error message.  Perhaps we should also accept a
 168          * message describing the purpose of the child.  Also indicate
 169          * this to the caller so that they know something went wrong. */
 170         if (waited_pid < 0) {
 171                 rsyserr(FERROR, errno, "waitpid");
 172                 *exit_code_ptr = RERR_WAITCHILD;
 173         } else if (!WIFEXITED(status)) {
 174 #ifdef WCOREDUMP
 175                 if (WCOREDUMP(status))
 176                         *exit_code_ptr = RERR_CRASHED;
 177                 else
 178 #endif
 179                 if (WIFSIGNALED(status))
 180                         *exit_code_ptr = RERR_TERMINATED;
 181                 else
 182                         *exit_code_ptr = RERR_WAITCHILD;
 183         } else
 184                 *exit_code_ptr = WEXITSTATUS(status);
 185 }
 186
 187 void write_del_stats(int f)
 188 {
 189         if (read_batch)
 190                 write_int(f, NDX_DEL_STATS);
 191         else
 192                 write_ndx(f, NDX_DEL_STATS);
 193         write_varint(f, stats.deleted_files - stats.deleted_dirs
 194                       - stats.deleted_symlinks - stats.deleted_devices
 195                       - stats.deleted_specials);
 196         write_varint(f, stats.deleted_dirs);
 197         write_varint(f, stats.deleted_symlinks);
 198         write_varint(f, stats.deleted_devices);
 199         write_varint(f, stats.deleted_specials);
 200 }
 201
 202 void read_del_stats(int f)
 203 {
 204         stats.deleted_files = read_varint(f);
 205         stats.deleted_files += stats.deleted_dirs = read_varint(f);
 206         stats.deleted_files += stats.deleted_symlinks = read_varint(f);
 207         stats.deleted_files += stats.deleted_devices = read_varint(f);
 208         stats.deleted_files += stats.deleted_specials = read_varint(f);
 209 }
 210
 211 /* This function gets called from all 3 processes.  We want the client side
 212  * to actually output the text, but the sender is the only process that has
 213  * all the stats we need.  So, if we're a client sender, we do the report.
 214  * If we're a server sender, we write the stats on the supplied fd.  If
 215  * we're the client receiver we read the stats from the supplied fd and do
 216  * the report.  All processes might also generate a set of debug stats, if
 217  * the verbose level is high enough (this is the only thing that the
 218  * generator process and the server receiver ever do here). */
 219 static void handle_stats(int f)
 220 {
 221         endtime = time(NULL);
 222
 223         /* Cache two stats because the read/write code can change it. */
 224         total_read = stats.total_read;
 225         total_written = stats.total_written;
 226
 227         if (INFO_GTE(STATS, 3)) {
 228                 /* These come out from every process */
 229                 show_malloc_stats();
 230                 show_flist_stats();
 231         }
 232
 233         if (am_generator)
 234                 return;
 235
 236         if (am_daemon) {
 237                 if (f == -1 || !am_sender)
 238                         return;
 239         }
 240
 241         if (am_server) {
 242                 if (am_sender) {
 243                         write_varlong30(f, total_read, 3);
 244                         write_varlong30(f, total_written, 3);
 245                         write_varlong30(f, stats.total_size, 3);
 246                         if (protocol_version >= 29) {
 247                                 write_varlong30(f, stats.flist_buildtime, 3);
 248                                 write_varlong30(f, stats.flist_xfertime, 3);
 249                         }
 250                 }
 251                 return;
 252         }
 253
 254         /* this is the client */
 255
 256         if (f < 0 && !am_sender) /* e.g. when we got an empty file list. */
 257                 ;
 258         else if (!am_sender) {
 259                 /* Read the first two in opposite order because the meaning of
 260                  * read/write swaps when switching from sender to receiver. */
 261                 total_written = read_varlong30(f, 3);
 262                 total_read = read_varlong30(f, 3);
 263                 stats.total_size = read_varlong30(f, 3);
 264                 if (protocol_version >= 29) {
 265                         stats.flist_buildtime = read_varlong30(f, 3);
 266                         stats.flist_xfertime = read_varlong30(f, 3);
 267                 }
 268         } else if (write_batch) {
 269                 /* The --read-batch process is going to be a client
 270                  * receiver, so we need to give it the stats. */
 271                 write_varlong30(batch_fd, total_read, 3);
 272                 write_varlong30(batch_fd, total_written, 3);
 273                 write_varlong30(batch_fd, stats.total_size, 3);
 274                 if (protocol_version >= 29) {
 275                         write_varlong30(batch_fd, stats.flist_buildtime, 3);
 276                         write_varlong30(batch_fd, stats.flist_xfertime, 3);
 277                 }
 278         }
 279 }
 280
 281 static void output_itemized_counts(const char *prefix, int *counts)
 282 {
 283         static char *labels[] = { "reg", "dir", "link", "dev", "special" };
 284         char buf[1024], *pre = " (";
 285         int j, len = 0;
 286         int total = counts[0];
 287         if (total) {
 288                 counts[0] -= counts[1] + counts[2] + counts[3] + counts[4];
 289                 for (j = 0; j < 5; j++) {
 290                         if (counts[j]) {
 291                                 len += snprintf(buf+len, sizeof buf - len - 2,
 292                                         "%s%s: %s",
 293                                         pre, labels[j], comma_num(counts[j]));
 294                                 pre = ", ";
 295                         }
 296                 }
 297                 buf[len++] = ')';
 298         }
 299         buf[len] = '\0';
 300         rprintf(FINFO, "%s: %s%s\n", prefix, comma_num(total), buf);
 301 }
 302
 303 static void output_summary(void)
 304 {
 305         if (INFO_GTE(STATS, 2)) {
 306                 rprintf(FCLIENT, "\n");
 307                 output_itemized_counts("Number of files", &stats.num_files);
 308                 if (protocol_version >= 29)
 309                         output_itemized_counts("Number of created files", &stats.created_files);
 310                 if (protocol_version >= 31)
 311                         output_itemized_counts("Number of deleted files", &stats.deleted_files);
 312                 rprintf(FINFO,"Number of regular files transferred: %s\n",
 313                         comma_num(stats.xferred_files));
 314                 rprintf(FINFO,"Total file size: %s bytes\n",
 315                         human_num(stats.total_size));
 316                 rprintf(FINFO,"Total transferred file size: %s bytes\n",
 317                         human_num(stats.total_transferred_size));
 318                 rprintf(FINFO,"Literal data: %s bytes\n",
 319                         human_num(stats.literal_data));
 320                 rprintf(FINFO,"Matched data: %s bytes\n",
 321                         human_num(stats.matched_data));
 322                 rprintf(FINFO,"File list size: %s\n",
 323                         human_num(stats.flist_size));
 324                 if (stats.flist_buildtime) {
 325                         rprintf(FINFO,
 326                                 "File list generation time: %s seconds\n",
 327                                 comma_dnum((double)stats.flist_buildtime / 1000, 3));
 328                         rprintf(FINFO,
 329                                 "File list transfer time: %s seconds\n",
 330                                 comma_dnum((double)stats.flist_xfertime / 1000, 3));
 331                 }
 332                 rprintf(FINFO,"Total bytes sent: %s\n",
 333                         human_num(total_written));
 334                 rprintf(FINFO,"Total bytes received: %s\n",
 335                         human_num(total_read));
 336         }
 337
 338         if (INFO_GTE(STATS, 1)) {
 339                 rprintf(FCLIENT, "\n");
 340                 rprintf(FINFO,
 341                         "sent %s bytes  received %s bytes  %s bytes/sec\n",
 342                         human_num(total_written), human_num(total_read),
 343                         human_dnum((total_written + total_read)/(0.5 + (endtime - starttime)), 2));
 344                 rprintf(FINFO, "total size is %s  speedup is %s%s\n",
 345                         human_num(stats.total_size),
 346                         comma_dnum((double)stats.total_size / (total_written+total_read), 2),
 347                         write_batch < 0 ? " (BATCH ONLY)" : dry_run ? " (DRY RUN)" : "");
 348         }
 349
 350         fflush(stdout);
 351         fflush(stderr);
 352 }
 353
 354
 355 /**
 356  * If our C library can get malloc statistics, then show them to FINFO
 357  **/
 358 static void show_malloc_stats(void)
 359 {
 360 #ifdef HAVE_MALLINFO
 361         struct mallinfo mi;
 362
 363         mi = mallinfo();
 364
 365         rprintf(FCLIENT, "\n");
 366         rprintf(FINFO, RSYNC_NAME "[%d] (%s%s%s) heap statistics:\n",
 367                 getpid(), am_server ? "server " : "",
 368                 am_daemon ? "daemon " : "", who_am_i());
 369         rprintf(FINFO, "  arena:     %10ld   (bytes from sbrk)\n",
 370                 (long)mi.arena);
 371         rprintf(FINFO, "  ordblks:   %10ld   (chunks not in use)\n",
 372                 (long)mi.ordblks);
 373         rprintf(FINFO, "  smblks:    %10ld\n",
 374                 (long)mi.smblks);
 375         rprintf(FINFO, "  hblks:     %10ld   (chunks from mmap)\n",
 376                 (long)mi.hblks);
 377         rprintf(FINFO, "  hblkhd:    %10ld   (bytes from mmap)\n",
 378                 (long)mi.hblkhd);
 379         rprintf(FINFO, "  allmem:    %10ld   (bytes from sbrk + mmap)\n",
 380                 (long)mi.arena + mi.hblkhd);
 381         rprintf(FINFO, "  usmblks:   %10ld\n",
 382                 (long)mi.usmblks);
 383         rprintf(FINFO, "  fsmblks:   %10ld\n",
 384                 (long)mi.fsmblks);
 385         rprintf(FINFO, "  uordblks:  %10ld   (bytes used)\n",
 386                 (long)mi.uordblks);
 387         rprintf(FINFO, "  fordblks:  %10ld   (bytes free)\n",
 388                 (long)mi.fordblks);
 389         rprintf(FINFO, "  keepcost:  %10ld   (bytes in releasable chunk)\n",
 390                 (long)mi.keepcost);
 391 #endif /* HAVE_MALLINFO */
 392 }
 393
 394
 395 /* Start the remote shell.   cmd may be NULL to use the default. */
 396 static pid_t do_cmd(char *cmd, char *machine, char *user, char **remote_argv, int remote_argc,
 397                     int *f_in_p, int *f_out_p)
 398 {
 399         int i, argc = 0;
 400         char *args[MAX_ARGS], *need_to_free = NULL;
 401         pid_t pid;
 402         int dash_l_set = 0;
 403
 404         if (!read_batch && !local_server) {
 405                 char *t, *f, in_quote = '\0';
 406                 char *rsh_env = getenv(RSYNC_RSH_ENV);
 407                 if (!cmd)
 408                         cmd = rsh_env;
 409                 if (!cmd)
 410                         cmd = RSYNC_RSH;
 411                 cmd = need_to_free = strdup(cmd);
 412                 if (!cmd)
 413                         goto oom;
 414
 415                 for (t = f = cmd; *f; f++) {
 416                         if (*f == ' ')
 417                                 continue;
 418                         /* Comparison leaves rooms for server_options(). */
 419                         if (argc >= MAX_ARGS - MAX_SERVER_ARGS)
 420                                 goto arg_overflow;
 421                         args[argc++] = t;
 422                         while (*f != ' ' || in_quote) {
 423                                 if (!*f) {
 424                                         if (in_quote) {
 425                                                 rprintf(FERROR,
 426                                                     "Missing trailing-%c in remote-shell command.\n",
 427                                                     in_quote);
 428                                                 exit_cleanup(RERR_SYNTAX);
 429                                         }
 430                                         f--;
 431                                         break;
 432                                 }
 433                                 if (*f == '\'' || *f == '"') {
 434                                         if (!in_quote) {
 435                                                 in_quote = *f++;
 436                                                 continue;
 437                                         }
 438                                         if (*f == in_quote && *++f != in_quote) {
 439                                                 in_quote = '\0';
 440                                                 continue;
 441                                         }
 442                                 }
 443                                 *t++ = *f++;
 444                         }
 445                         *t++ = '\0';
 446                 }
 447
 448                 /* check to see if we've already been given '-l user' in
 449                  * the remote-shell command */
 450                 for (i = 0; i < argc-1; i++) {
 451                         if (!strcmp(args[i], "-l") && args[i+1][0] != '-')
 452                                 dash_l_set = 1;
 453                 }
 454
 455 #ifdef HAVE_REMSH
 456                 /* remsh (on HPUX) takes the arguments the other way around */
 457                 args[argc++] = machine;
 458                 if (user && !(daemon_over_rsh && dash_l_set)) {
 459                         args[argc++] = "-l";
 460                         args[argc++] = user;
 461                 }
 462 #else
 463                 if (user && !(daemon_over_rsh && dash_l_set)) {
 464                         args[argc++] = "-l";
 465                         args[argc++] = user;
 466                 }
 467                 args[argc++] = machine;
 468 #endif
 469
 470                 args[argc++] = rsync_path;
 471
 472                 if (blocking_io < 0) {
 473                         char *cp;
 474                         if ((cp = strrchr(cmd, '/')) != NULL)
 475                                 cp++;
 476                         else
 477                                 cp = cmd;
 478                         if (strcmp(cp, "rsh") == 0 || strcmp(cp, "remsh") == 0)
 479                                 blocking_io = 1;
 480                 }
 481
 482                 server_options(args,&argc);
 483
 484                 if (argc >= MAX_ARGS - 2)
 485                         goto arg_overflow;
 486         }
 487
 488         args[argc++] = ".";
 489
 490         if (!daemon_over_rsh) {
 491                 while (remote_argc > 0) {
 492                         if (argc >= MAX_ARGS - 1) {
 493                           arg_overflow:
 494                                 rprintf(FERROR, "internal: args[] overflowed in do_cmd()\n");
 495                                 exit_cleanup(RERR_SYNTAX);
 496                         }
 497                         if (**remote_argv == '-') {
 498                                 if (asprintf(args + argc++, "./%s", *remote_argv++) < 0)
 499                                         out_of_memory("do_cmd");
 500                         } else
 501                                 args[argc++] = *remote_argv++;
 502                         remote_argc--;
 503                 }
 504         }
 505
 506         args[argc] = NULL;
 507
 508         if (DEBUG_GTE(CMD, 2)) {
 509                 for (i = 0; i < argc; i++)
 510                         rprintf(FCLIENT, "cmd[%d]=%s ", i, args[i]);
 511                 rprintf(FCLIENT, "\n");
 512         }
 513
 514         if (read_batch) {
 515                 int from_gen_pipe[2];
 516                 set_allow_inc_recurse();
 517                 if (fd_pair(from_gen_pipe) < 0) {
 518                         rsyserr(FERROR, errno, "pipe");
 519                         exit_cleanup(RERR_IPC);
 520                 }
 521                 batch_gen_fd = from_gen_pipe[0];
 522                 *f_out_p = from_gen_pipe[1];
 523                 *f_in_p = batch_fd;
 524                 pid = (pid_t)-1; /* no child pid */
 525 #ifdef ICONV_CONST
 526                 setup_iconv();
 527 #endif
 528         } else if (local_server) {
 529                 /* If the user didn't request --[no-]whole-file, force
 530                  * it on, but only if we're not batch processing. */
 531                 if (whole_file < 0 && !write_batch)
 532                         whole_file = 1;
 533                 set_allow_inc_recurse();
 534                 pid = local_child(argc, args, f_in_p, f_out_p, child_main);
 535 #ifdef ICONV_CONST
 536                 setup_iconv();
 537 #endif
 538         } else {
 539                 pid = piped_child(args, f_in_p, f_out_p);
 540 #ifdef ICONV_CONST
 541                 setup_iconv();
 542 #endif
 543                 if (protect_args && !daemon_over_rsh)
 544                         send_protected_args(*f_out_p, args);
 545         }
 546
 547         if (need_to_free)
 548                 free(need_to_free);
 549
 550         return pid;
 551
 552   oom:
 553         out_of_memory("do_cmd");
 554         return 0; /* not reached */
 555 }
 556
 557 /* The receiving side operates in one of two modes:
 558  *
 559  * 1. it receives any number of files into a destination directory,
 560  * placing them according to their names in the file-list.
 561  *
 562  * 2. it receives a single file and saves it using the name in the
 563  * destination path instead of its file-list name.  This requires a
 564  * "local name" for writing out the destination file.
 565  *
 566  * So, our task is to figure out what mode/local-name we need.
 567  * For mode 1, we change into the destination directory and return NULL.
 568  * For mode 2, we change into the directory containing the destination
 569  * file (if we aren't already there) and return the local-name. */
 570 static char *get_local_name(struct file_list *flist, char *dest_path)
 571 {
 572         STRUCT_STAT st;
 573         int statret;
 574         char *cp;
 575
 576         if (DEBUG_GTE(RECV, 1)) {
 577                 rprintf(FINFO, "get_local_name count=%d %s\n",
 578                         file_total, NS(dest_path));
 579         }
 580
 581         if (!dest_path || list_only)
 582                 return NULL;
 583
 584         /* Treat an empty string as a copy into the current directory. */
 585         if (!*dest_path)
 586             dest_path = ".";
 587
 588         if (daemon_filter_list.head) {
 589                 char *slash = strrchr(dest_path, '/');
 590                 if (slash && (slash[1] == '\0' || (slash[1] == '.' && slash[2] == '\0')))
 591                         *slash = '\0';
 592                 else
 593                         slash = NULL;
 594                 if ((*dest_path != '.' || dest_path[1] != '\0')
 595                  && (check_filter(&daemon_filter_list, FLOG, dest_path, 0) < 0
 596                   || check_filter(&daemon_filter_list, FLOG, dest_path, 1) < 0)) {
 597                         rprintf(FERROR, "ERROR: daemon has excluded destination \"%s\"\n",
 598                                 dest_path);
 599                         exit_cleanup(RERR_FILESELECT);
 600                 }
 601                 if (slash)
 602                         *slash = '/';
 603         }
 604
 605         /* See what currently exists at the destination. */
 606         if ((statret = do_stat(dest_path, &st)) == 0) {
 607                 /* If the destination is a dir, enter it and use mode 1. */
 608                 if (S_ISDIR(st.st_mode)) {
 609                         if (!change_dir(dest_path, CD_NORMAL)) {
 610                                 rsyserr(FERROR, errno, "change_dir#1 %s failed",
 611                                         full_fname(dest_path));
 612                                 exit_cleanup(RERR_FILESELECT);
 613                         }
 614                         filesystem_dev = st.st_dev; /* ensures --force works right w/-x */
 615                         return NULL;
 616                 }
 617                 if (file_total > 1) {
 618                         rprintf(FERROR,
 619                                 "ERROR: destination must be a directory when"
 620                                 " copying more than 1 file\n");
 621                         exit_cleanup(RERR_FILESELECT);
 622                 }
 623                 if (file_total == 1 && S_ISDIR(flist->files[0]->mode)) {
 624                         rprintf(FERROR,
 625                                 "ERROR: cannot overwrite non-directory"
 626                                 " with a directory\n");
 627                         exit_cleanup(RERR_FILESELECT);
 628                 }
 629         } else if (errno != ENOENT) {
 630                 /* If we don't know what's at the destination, fail. */
 631                 rsyserr(FERROR, errno, "ERROR: cannot stat destination %s",
 632                         full_fname(dest_path));
 633                 exit_cleanup(RERR_FILESELECT);
 634         }
 635
 636         cp = strrchr(dest_path, '/');
 637
 638         /* If we need a destination directory because the transfer is not
 639          * of a single non-directory or the user has requested one via a
 640          * destination path ending in a slash, create one and use mode 1. */
 641         if (file_total > 1 || (cp && !cp[1])) {
 642                 /* Lop off the final slash (if any). */
 643                 if (cp && !cp[1])
 644                         *cp = '\0';
 645
 646                 if (statret == 0) {
 647                         rprintf(FERROR,
 648                             "ERROR: destination path is not a directory\n");
 649                         exit_cleanup(RERR_SYNTAX);
 650                 }
 651
 652                 if (do_mkdir(dest_path, ACCESSPERMS) != 0) {
 653                         rsyserr(FERROR, errno, "mkdir %s failed",
 654                                 full_fname(dest_path));
 655                         exit_cleanup(RERR_FILEIO);
 656                 }
 657
 658                 if (flist->high >= flist->low
 659                  && strcmp(flist->files[flist->low]->basename, ".") == 0)
 660                         flist->files[0]->flags |= FLAG_DIR_CREATED;
 661
 662                 if (INFO_GTE(NAME, 1))
 663                         rprintf(FINFO, "created directory %s\n", dest_path);
 664
 665                 if (dry_run) {
 666                         /* Indicate that dest dir doesn't really exist. */
 667                         dry_run++;
 668                 }
 669
 670                 if (!change_dir(dest_path, dry_run > 1 ? CD_SKIP_CHDIR : CD_NORMAL)) {
 671                         rsyserr(FERROR, errno, "change_dir#2 %s failed",
 672                                 full_fname(dest_path));
 673                         exit_cleanup(RERR_FILESELECT);
 674                 }
 675
 676                 return NULL;
 677         }
 678
 679         /* Otherwise, we are writing a single file, possibly on top of an
 680          * existing non-directory.  Change to the item's parent directory
 681          * (if it has a path component), return the basename of the
 682          * destination file as the local name, and use mode 2. */
 683         if (!cp)
 684                 return dest_path;
 685
 686         if (cp == dest_path)
 687                 dest_path = "/";
 688
 689         *cp = '\0';
 690         if (!change_dir(dest_path, CD_NORMAL)) {
 691                 rsyserr(FERROR, errno, "change_dir#3 %s failed",
 692                         full_fname(dest_path));
 693                 exit_cleanup(RERR_FILESELECT);
 694         }
 695         *cp = '/';
 696
 697         return cp + 1;
 698 }
 699
 700 /* This function checks on our alternate-basis directories.  If we're in
 701  * dry-run mode and the destination dir does not yet exist, we'll try to
 702  * tweak any dest-relative paths to make them work for a dry-run (the
 703  * destination dir must be in curr_dir[] when this function is called).
 704  * We also warn about any arg that is non-existent or not a directory. */
 705 static void check_alt_basis_dirs(void)
 706 {
 707         STRUCT_STAT st;
 708         char **dir_p, *slash = strrchr(curr_dir, '/');
 709
 710         for (dir_p = basis_dir; *dir_p; dir_p++) {
 711                 if (dry_run > 1 && **dir_p != '/') {
 712                         int len = curr_dir_len + 1 + strlen(*dir_p) + 1;
 713                         char *new = new_array(char, len);
 714                         if (!new)
 715                                 out_of_memory("check_alt_basis_dirs");
 716                         if (slash && strncmp(*dir_p, "../", 3) == 0) {
 717                             /* We want to remove only one leading "../" prefix for
 718                              * the directory we couldn't create in dry-run mode:
 719                              * this ensures that any other ".." references get
 720                              * evaluated the same as they would for a live copy. */
 721                             *slash = '\0';
 722                             pathjoin(new, len, curr_dir, *dir_p + 3);
 723                             *slash = '/';
 724                         } else
 725                             pathjoin(new, len, curr_dir, *dir_p);
 726                         *dir_p = new;
 727                 }
 728                 if (do_stat(*dir_p, &st) < 0) {
 729                         rprintf(FWARNING, "%s arg does not exist: %s\n",
 730                                 dest_option, *dir_p);
 731                 } else if (!S_ISDIR(st.st_mode)) {
 732                         rprintf(FWARNING, "%s arg is not a dir: %s\n",
 733                                 dest_option, *dir_p);
 734                 }
 735         }
 736 }
 737
 738 /* This is only called by the sender. */
 739 static void read_final_goodbye(int f_in, int f_out)
 740 {
 741         int i, iflags, xlen;
 742         uchar fnamecmp_type;
 743         char xname[MAXPATHLEN];
 744
 745         shutting_down = True;
 746
 747         if (protocol_version < 29)
 748                 i = read_int(f_in);
 749         else {
 750                 i = read_ndx_and_attrs(f_in, f_out, &iflags, &fnamecmp_type, xname, &xlen);
 751                 if (protocol_version >= 31 && i == NDX_DONE) {
 752                         if (am_sender)
 753                                 write_ndx(f_out, NDX_DONE);
 754                         else {
 755                                 if (batch_gen_fd >= 0) {
 756                                         while (read_int(batch_gen_fd) != NDX_DEL_STATS) {}
 757                                         read_del_stats(batch_gen_fd);
 758                                 }
 759                                 write_int(f_out, NDX_DONE);
 760                         }
 761                         i = read_ndx_and_attrs(f_in, f_out, &iflags, &fnamecmp_type, xname, &xlen);
 762                 }
 763         }
 764
 765         if (i != NDX_DONE) {
 766                 rprintf(FERROR, "Invalid packet at end of run (%d) [%s]\n",
 767                         i, who_am_i());
 768                 exit_cleanup(RERR_PROTOCOL);
 769         }
 770 }
 771
 772 static void do_server_sender(int f_in, int f_out, int argc, char *argv[])
 773 {
 774         struct file_list *flist;
 775         char *dir = argv[0];
 776
 777         if (DEBUG_GTE(SEND, 1)) {
 778                 rprintf(FINFO, "server_sender starting pid=%ld\n",
 779                         (long)getpid());
 780         }
 781
 782         if (am_daemon && lp_write_only(module_id)) {
 783                 rprintf(FERROR, "ERROR: module is write only\n");
 784                 exit_cleanup(RERR_SYNTAX);
 785                 return;
 786         }
 787         if (am_daemon && read_only && remove_source_files) {
 788                 rprintf(FERROR,
 789                     "ERROR: --remove-%s-files cannot be used with a read-only module\n",
 790                     remove_source_files == 1 ? "source" : "sent");
 791                 exit_cleanup(RERR_SYNTAX);
 792                 return;
 793         }
 794
 795         if (!relative_paths) {
 796                 if (!change_dir(dir, CD_NORMAL)) {
 797                         rsyserr(FERROR, errno, "change_dir#3 %s failed",
 798                                 full_fname(dir));
 799                         exit_cleanup(RERR_FILESELECT);
 800                 }
 801         }
 802         argc--;
 803         argv++;
 804
 805         if (argc == 0 && (recurse || xfer_dirs || list_only)) {
 806                 argc = 1;
 807                 argv--;
 808                 argv[0] = ".";
 809         }
 810
 811         flist = send_file_list(f_out,argc,argv);
 812         if (!flist || flist->used == 0) {
 813                 /* Make sure input buffering is off so we can't hang in noop_io_until_death(). */
 814                 io_end_buffering_in(0);
 815                 /* TODO:  we should really exit in a more controlled manner. */
 816                 exit_cleanup(0);
 817         }
 818
 819         io_start_buffering_in(f_in);
 820
 821         send_files(f_in, f_out);
 822         io_flush(FULL_FLUSH);
 823         handle_stats(f_out);
 824         if (protocol_version >= 24)
 825                 read_final_goodbye(f_in, f_out);
 826         io_flush(FULL_FLUSH);
 827         exit_cleanup(0);
 828 }
 829
 830
 831 static int do_recv(int f_in, int f_out, char *local_name)
 832 {
 833         int pid;
 834         int exit_code = 0;
 835         int error_pipe[2];
 836
 837         /* The receiving side mustn't obey this, or an existing symlink that
 838          * points to an identical file won't be replaced by the referent. */
 839         copy_links = copy_dirlinks = copy_unsafe_links = 0;
 840
 841 #ifdef SUPPORT_HARD_LINKS
 842         if (preserve_hard_links && !inc_recurse)
 843                 match_hard_links(first_flist);
 844 #endif
 845
 846         if (fd_pair(error_pipe) < 0) {
 847                 rsyserr(FERROR, errno, "pipe failed in do_recv");
 848                 exit_cleanup(RERR_IPC);
 849         }
 850
 851         if (backup_dir) {
 852                 int ret = make_path(backup_dir_buf, MKP_DROP_NAME); /* drops trailing slash */
 853                 if (ret < 0)
 854                         exit_cleanup(RERR_SYNTAX);
 855                 if (ret)
 856                         rprintf(FINFO, "Created backup_dir %s\n", backup_dir_buf);
 857                 else if (INFO_GTE(BACKUP, 1))
 858                         rprintf(FINFO, "backup_dir is %s\n", backup_dir_buf);
 859         }
 860
 861         io_flush(FULL_FLUSH);
 862
 863         if ((pid = do_fork()) == -1) {
 864                 rsyserr(FERROR, errno, "fork failed in do_recv");
 865                 exit_cleanup(RERR_IPC);
 866         }
 867
 868         if (pid == 0) {
 869                 am_receiver = 1;
 870                 send_msgs_to_gen = am_server;
 871
 872                 close(error_pipe[0]);
 873
 874                 /* We can't let two processes write to the socket at one time. */
 875                 io_end_multiplex_out(MPLX_SWITCHING);
 876                 if (f_in != f_out)
 877                         close(f_out);
 878                 sock_f_out = -1;
 879                 f_out = error_pipe[1];
 880
 881                 bwlimit_writemax = 0; /* receiver doesn't need to do this */
 882
 883                 if (read_batch)
 884                         io_start_buffering_in(f_in);
 885                 io_start_multiplex_out(f_out);
 886
 887                 recv_files(f_in, f_out, local_name);
 888                 io_flush(FULL_FLUSH);
 889                 handle_stats(f_in);
 890
 891                 if (output_needs_newline) {
 892                         fputc('\n', stdout);
 893                         output_needs_newline = 0;
 894                 }
 895
 896                 write_int(f_out, NDX_DONE);
 897                 send_msg(MSG_STATS, (char*)&stats.total_read, sizeof stats.total_read, 0);
 898                 io_flush(FULL_FLUSH);
 899
 900                 /* Handle any keep-alive packets from the post-processing work
 901                  * that the generator does. */
 902                 if (protocol_version >= 29) {
 903                         kluge_around_eof = -1;
 904
 905                         /* This should only get stopped via a USR2 signal. */
 906                         read_final_goodbye(f_in, f_out);
 907
 908                         rprintf(FERROR, "Invalid packet at end of run [%s]\n",
 909                                 who_am_i());
 910                         exit_cleanup(RERR_PROTOCOL);
 911                 }
 912
 913                 /* Finally, we go to sleep until our parent kills us with a
 914                  * USR2 signal.  We sleep for a short time, as on some OSes
 915                  * a signal won't interrupt a sleep! */
 916                 while (1)
 917                         msleep(20);
 918         }
 919
 920         am_generator = 1;
 921         flist_receiving_enabled = True;
 922
 923         io_end_multiplex_in(MPLX_SWITCHING);
 924         if (write_batch && !am_server)
 925                 stop_write_batch();
 926
 927         close(error_pipe[1]);
 928         if (f_in != f_out)
 929                 close(f_in);
 930         sock_f_in = -1;
 931         f_in = error_pipe[0];
 932
 933         io_start_buffering_out(f_out);
 934         io_start_multiplex_in(f_in);
 935
 936 #ifdef SUPPORT_HARD_LINKS
 937         if (preserve_hard_links && inc_recurse) {
 938                 struct file_list *flist;
 939                 for (flist = first_flist; flist; flist = flist->next)
 940                         match_hard_links(flist);
 941         }
 942 #endif
 943
 944         generate_files(f_out, local_name);
 945
 946         handle_stats(-1);
 947         io_flush(FULL_FLUSH);
 948         shutting_down = True;
 949         if (protocol_version >= 24) {
 950                 /* send a final goodbye message */
 951                 write_ndx(f_out, NDX_DONE);
 952         }
 953         io_flush(FULL_FLUSH);
 954
 955         kill(pid, SIGUSR2);
 956         wait_process_with_flush(pid, &exit_code);
 957         return exit_code;
 958 }
 959
 960 static void do_server_recv(int f_in, int f_out, int argc, char *argv[])
 961 {
 962         int exit_code;
 963         struct file_list *flist;
 964         char *local_name = NULL;
 965         int negated_levels;
 966
 967         if (filesfrom_fd >= 0 && !msgs2stderr && protocol_version < 31) {
 968                 /* We can't mix messages with files-from data on the socket,
 969                  * so temporarily turn off info/debug messages. */
 970                 negate_output_levels();
 971                 negated_levels = 1;
 972         } else
 973                 negated_levels = 0;
 974
 975         if (DEBUG_GTE(RECV, 1)) {
 976                 rprintf(FINFO, "server_recv(%d) starting pid=%ld\n",
 977                         argc, (long)getpid());
 978         }
 979
 980         if (am_daemon && read_only) {
 981                 rprintf(FERROR,"ERROR: module is read only\n");
 982                 exit_cleanup(RERR_SYNTAX);
 983                 return;
 984         }
 985
 986         if (argc > 0) {
 987                 char *dir = argv[0];
 988                 argc--;
 989                 argv++;
 990                 if (!am_daemon && !change_dir(dir, CD_NORMAL)) {
 991                         rsyserr(FERROR, errno, "change_dir#4 %s failed",
 992                                 full_fname(dir));
 993                         exit_cleanup(RERR_FILESELECT);
 994                 }
 995         }
 996
 997         if (protocol_version >= 30)
 998                 io_start_multiplex_in(f_in);
 999         else
1000                 io_start_buffering_in(f_in);
1001         recv_filter_list(f_in);
1002
1003         if (filesfrom_fd >= 0) {
1004                 /* We need to send the files-from names to the sender at the
1005                  * same time that we receive the file-list from them, so we
1006                  * need the IO routines to automatically write out the names
1007                  * onto our f_out socket as we read the file-list.  This
1008                  * avoids both deadlock and extra delays/buffers. */
1009                 start_filesfrom_forwarding(filesfrom_fd);
1010                 filesfrom_fd = -1;
1011         }
1012
1013         flist = recv_file_list(f_in);
1014         if (!flist) {
1015                 rprintf(FERROR,"server_recv: recv_file_list error\n");
1016                 exit_cleanup(RERR_FILESELECT);
1017         }
1018         if (inc_recurse && file_total == 1)
1019                 recv_additional_file_list(f_in);
1020
1021         if (negated_levels)
1022                 negate_output_levels();
1023
1024         if (argc > 0)
1025                 local_name = get_local_name(flist,argv[0]);
1026
1027         /* Now that we know what our destination directory turned out to be,
1028          * we can sanitize the --link-/copy-/compare-dest args correctly. */
1029         if (sanitize_paths) {
1030                 char **dir_p;
1031                 for (dir_p = basis_dir; *dir_p; dir_p++)
1032                         *dir_p = sanitize_path(NULL, *dir_p, NULL, curr_dir_depth, SP_DEFAULT);
1033                 if (partial_dir)
1034                         partial_dir = sanitize_path(NULL, partial_dir, NULL, curr_dir_depth, SP_DEFAULT);
1035         }
1036         check_alt_basis_dirs();
1037
1038         if (daemon_filter_list.head) {
1039                 char **dir_p;
1040                 filter_rule_list *elp = &daemon_filter_list;
1041
1042                 for (dir_p = basis_dir; *dir_p; dir_p++) {
1043                         char *dir = *dir_p;
1044                         if (*dir == '/')
1045                                 dir += module_dirlen;
1046                         if (check_filter(elp, FLOG, dir, 1) < 0)
1047                                 goto options_rejected;
1048                 }
1049                 if (partial_dir && *partial_dir == '/'
1050                  && check_filter(elp, FLOG, partial_dir + module_dirlen, 1) < 0) {
1051                     options_rejected:
1052                         rprintf(FERROR,
1053                                 "Your options have been rejected by the server.\n");
1054                         exit_cleanup(RERR_SYNTAX);
1055                 }
1056         }
1057
1058         exit_code = do_recv(f_in, f_out, local_name);
1059         exit_cleanup(exit_code);
1060 }
1061
1062
1063 int child_main(int argc, char *argv[])
1064 {
1065         start_server(STDIN_FILENO, STDOUT_FILENO, argc, argv);
1066         return 0;
1067 }
1068
1069
1070 void start_server(int f_in, int f_out, int argc, char *argv[])
1071 {
1072         set_nonblocking(f_in);
1073         set_nonblocking(f_out);
1074
1075         io_set_sock_fds(f_in, f_out);
1076         setup_protocol(f_out, f_in);
1077
1078         if (protocol_version >= 23)
1079                 io_start_multiplex_out(f_out);
1080         if (am_daemon && io_timeout && protocol_version >= 31)
1081                 send_msg_int(MSG_IO_TIMEOUT, io_timeout);
1082
1083         if (am_sender) {
1084                 keep_dirlinks = 0; /* Must be disabled on the sender. */
1085                 if (need_messages_from_generator)
1086                         io_start_multiplex_in(f_in);
1087                 else
1088                         io_start_buffering_in(f_in);
1089                 recv_filter_list(f_in);
1090                 do_server_sender(f_in, f_out, argc, argv);
1091         } else
1092                 do_server_recv(f_in, f_out, argc, argv);
1093         exit_cleanup(0);
1094 }
1095
1096 /* This is called once the connection has been negotiated.  It is used
1097  * for rsyncd, remote-shell, and local connections. */
1098 int client_run(int f_in, int f_out, pid_t pid, int argc, char *argv[])
1099 {
1100         struct file_list *flist = NULL;
1101         int exit_code = 0, exit_code2 = 0;
1102         char *local_name = NULL;
1103
1104         cleanup_child_pid = pid;
1105         if (!read_batch) {
1106                 set_nonblocking(f_in);
1107                 set_nonblocking(f_out);
1108         }
1109
1110         io_set_sock_fds(f_in, f_out);
1111         setup_protocol(f_out,f_in);
1112
1113         /* We set our stderr file handle to blocking because ssh might have
1114          * set it to non-blocking.  This can be particularly troublesome if
1115          * stderr is a clone of stdout, because ssh would have set our stdout
1116          * to non-blocking at the same time (which can easily cause us to lose
1117          * output from our print statements).  This kluge shouldn't cause ssh
1118          * any problems for how we use it.  Note also that we delayed setting
1119          * this until after the above protocol setup so that we know for sure
1120          * that ssh is done twiddling its file descriptors.  */
1121         set_blocking(STDERR_FILENO);
1122
1123         if (am_sender) {
1124                 keep_dirlinks = 0; /* Must be disabled on the sender. */
1125
1126                 if (always_checksum
1127                  && (log_format_has(stdout_format, 'C')
1128                   || log_format_has(logfile_format, 'C')))
1129                         sender_keeps_checksum = 1;
1130
1131                 if (protocol_version >= 30)
1132                         io_start_multiplex_out(f_out);
1133                 else
1134                         io_start_buffering_out(f_out);
1135                 if (protocol_version >= 31 || (!filesfrom_host && protocol_version >= 23))
1136                         io_start_multiplex_in(f_in);
1137                 else
1138                         io_start_buffering_in(f_in);
1139                 send_filter_list(f_out);
1140                 if (filesfrom_host)
1141                         filesfrom_fd = f_in;
1142
1143                 if (write_batch && !am_server)
1144                         start_write_batch(f_out);
1145                 flist = send_file_list(f_out, argc, argv);
1146                 if (DEBUG_GTE(FLIST, 3))
1147                         rprintf(FINFO,"file list sent\n");
1148
1149                 if (protocol_version < 31 && filesfrom_host && protocol_version >= 23)
1150                         io_start_multiplex_in(f_in);
1151
1152                 io_flush(NORMAL_FLUSH);
1153                 send_files(f_in, f_out);
1154                 io_flush(FULL_FLUSH);
1155                 handle_stats(-1);
1156                 if (protocol_version >= 24)
1157                         read_final_goodbye(f_in, f_out);
1158                 if (pid != -1) {
1159                         if (DEBUG_GTE(EXIT, 2))
1160                                 rprintf(FINFO,"client_run waiting on %d\n", (int) pid);
1161                         io_flush(FULL_FLUSH);
1162                         wait_process_with_flush(pid, &exit_code);
1163                 }
1164                 output_summary();
1165                 io_flush(FULL_FLUSH);
1166                 exit_cleanup(exit_code);
1167         }
1168
1169         if (!read_batch) {
1170                 if (protocol_version >= 23)
1171                         io_start_multiplex_in(f_in);
1172                 if (need_messages_from_generator)
1173                         io_start_multiplex_out(f_out);
1174                 else
1175                         io_start_buffering_out(f_out);
1176         }
1177
1178         send_filter_list(read_batch ? -1 : f_out);
1179
1180         if (filesfrom_fd >= 0) {
1181                 start_filesfrom_forwarding(filesfrom_fd);
1182                 filesfrom_fd = -1;
1183         }
1184
1185         if (write_batch && !am_server)
1186                 start_write_batch(f_in);
1187         flist = recv_file_list(f_in);
1188         if (inc_recurse && file_total == 1)
1189                 recv_additional_file_list(f_in);
1190
1191         if (flist && flist->used > 0) {
1192                 local_name = get_local_name(flist, argv[0]);
1193
1194                 check_alt_basis_dirs();
1195
1196                 exit_code2 = do_recv(f_in, f_out, local_name);
1197         } else {
1198                 handle_stats(-1);
1199                 output_summary();
1200         }
1201
1202         if (pid != -1) {
1203                 if (DEBUG_GTE(RECV, 1))
1204                         rprintf(FINFO,"client_run2 waiting on %d\n", (int) pid);
1205                 io_flush(FULL_FLUSH);
1206                 wait_process_with_flush(pid, &exit_code);
1207         }
1208
1209         return MAX(exit_code, exit_code2);
1210 }
1211
1212 static int copy_argv(char *argv[])
1213 {
1214         int i;
1215
1216         for (i = 0; argv[i]; i++) {
1217                 if (!(argv[i] = strdup(argv[i]))) {
1218                         rprintf (FERROR, "out of memory at %s(%d)\n",
1219                                  __FILE__, __LINE__);
1220                         return RERR_MALLOC;
1221                 }
1222         }
1223
1224         return 0;
1225 }
1226
1227
1228 /* Start a client for either type of remote connection.  Work out
1229  * whether the arguments request a remote shell or rsyncd connection,
1230  * and call the appropriate connection function, then run_client.
1231  *
1232  * Calls either start_socket_client (for sockets) or do_cmd and
1233  * client_run (for ssh). */
1234 static int start_client(int argc, char *argv[])
1235 {
1236         char *p, *shell_machine = NULL, *shell_user = NULL;
1237         char **remote_argv;
1238         int remote_argc;
1239         int f_in, f_out;
1240         int ret;
1241         pid_t pid;
1242
1243         /* Don't clobber argv[] so that ps(1) can still show the right
1244          * command line. */
1245         if ((ret = copy_argv(argv)) != 0)
1246                 return ret;
1247
1248         if (!read_batch) { /* for read_batch, NO source is specified */
1249                 char *path = check_for_hostspec(argv[0], &shell_machine, &rsync_port);
1250                 if (path) { /* source is remote */
1251                         char *dummy_host;
1252                         int dummy_port = 0;
1253                         *argv = path;
1254                         remote_argv = argv;
1255                         remote_argc = argc;
1256                         argv += argc - 1;
1257                         if (argc == 1 || **argv == ':')
1258                                 argc = 0; /* no dest arg */
1259                         else if (check_for_hostspec(*argv, &dummy_host, &dummy_port)) {
1260                                 rprintf(FERROR,
1261                                         "The source and destination cannot both be remote.\n");
1262                                 exit_cleanup(RERR_SYNTAX);
1263                         } else {
1264                                 remote_argc--; /* don't count dest */
1265                                 argc = 1;
1266                         }
1267                         if (filesfrom_host && *filesfrom_host
1268                             && strcmp(filesfrom_host, shell_machine) != 0) {
1269                                 rprintf(FERROR,
1270                                         "--files-from hostname is not the same as the transfer hostname\n");
1271                                 exit_cleanup(RERR_SYNTAX);
1272                         }
1273                         am_sender = 0;
1274                         if (rsync_port)
1275                                 daemon_over_rsh = shell_cmd ? 1 : -1;
1276                 } else { /* source is local, check dest arg */
1277                         am_sender = 1;
1278
1279                         if (argc > 1) {
1280                                 p = argv[--argc];
1281                                 remote_argv = argv + argc;
1282                         } else {
1283                                 static char *dotarg[1] = { "." };
1284                                 p = dotarg[0];
1285                                 remote_argv = dotarg;
1286                         }
1287                         remote_argc = 1;
1288
1289                         path = check_for_hostspec(p, &shell_machine, &rsync_port);
1290                         if (path && filesfrom_host && *filesfrom_host
1291                             && strcmp(filesfrom_host, shell_machine) != 0) {
1292                                 rprintf(FERROR,
1293                                         "--files-from hostname is not the same as the transfer hostname\n");
1294                                 exit_cleanup(RERR_SYNTAX);
1295                         }
1296                         if (!path) { /* no hostspec found, so src & dest are local */
1297                                 local_server = 1;
1298                                 if (filesfrom_host) {
1299                                         rprintf(FERROR,
1300                                                 "--files-from cannot be remote when the transfer is local\n");
1301                                         exit_cleanup(RERR_SYNTAX);
1302                                 }
1303                                 shell_machine = NULL;
1304                         } else { /* hostspec was found, so dest is remote */
1305                                 argv[argc] = path;
1306                                 if (rsync_port)
1307                                         daemon_over_rsh = shell_cmd ? 1 : -1;
1308                         }
1309                 }
1310         } else {  /* read_batch */
1311                 local_server = 1;
1312                 if (check_for_hostspec(argv[argc-1], &shell_machine, &rsync_port)) {
1313                         rprintf(FERROR, "remote destination is not allowed with --read-batch\n");
1314                         exit_cleanup(RERR_SYNTAX);
1315                 }
1316                 remote_argv = argv += argc - 1;
1317                 remote_argc = argc = 1;
1318         }
1319
1320         if (!rsync_port && remote_argc && !**remote_argv) /* Turn an empty arg into a dot dir. */
1321                 *remote_argv = ".";
1322
1323         if (am_sender) {
1324                 char *dummy_host;
1325                 int dummy_port = rsync_port;
1326                 int i;
1327                 /* For local source, extra source args must not have hostspec. */
1328                 for (i = 1; i < argc; i++) {
1329                         if (check_for_hostspec(argv[i], &dummy_host, &dummy_port)) {
1330                                 rprintf(FERROR, "Unexpected remote arg: %s\n", argv[i]);
1331                                 exit_cleanup(RERR_SYNTAX);
1332                         }
1333                 }
1334         } else {
1335                 char *dummy_host;
1336                 int dummy_port = rsync_port;
1337                 int i;
1338                 /* For remote source, any extra source args must have either
1339                  * the same hostname or an empty hostname. */
1340                 for (i = 1; i < remote_argc; i++) {
1341                         char *arg = check_for_hostspec(remote_argv[i], &dummy_host, &dummy_port);
1342                         if (!arg) {
1343                                 rprintf(FERROR, "Unexpected local arg: %s\n", remote_argv[i]);
1344                                 rprintf(FERROR, "If arg is a remote file/dir, prefix it with a colon (:).\n");
1345                                 exit_cleanup(RERR_SYNTAX);
1346                         }
1347                         if (*dummy_host && strcmp(dummy_host, shell_machine) != 0) {
1348                                 rprintf(FERROR, "All source args must come from the same machine.\n");
1349                                 exit_cleanup(RERR_SYNTAX);
1350                         }
1351                         if (rsync_port != dummy_port) {
1352                                 if (!rsync_port || !dummy_port)
1353                                         rprintf(FERROR, "All source args must use the same hostspec format.\n");
1354                                 else
1355                                         rprintf(FERROR, "All source args must use the same port number.\n");
1356                                 exit_cleanup(RERR_SYNTAX);
1357                         }
1358                         if (!rsync_port && !*arg) /* Turn an empty arg into a dot dir. */
1359                                 arg = ".";
1360                         remote_argv[i] = arg;
1361                 }
1362         }
1363
1364         if (daemon_over_rsh < 0)
1365                 return start_socket_client(shell_machine, remote_argc, remote_argv, argc, argv);
1366
1367         if (password_file && !daemon_over_rsh) {
1368                 rprintf(FERROR, "The --password-file option may only be "
1369                                 "used when accessing an rsync daemon.\n");
1370                 exit_cleanup(RERR_SYNTAX);
1371         }
1372
1373         if (connect_timeout) {
1374                 rprintf(FERROR, "The --contimeout option may only be "
1375                                 "used when connecting to an rsync daemon.\n");
1376                 exit_cleanup(RERR_SYNTAX);
1377         }
1378
1379         if (shell_machine) {
1380                 p = strrchr(shell_machine,'@');
1381                 if (p) {
1382                         *p = 0;
1383                         shell_user = shell_machine;
1384                         shell_machine = p+1;
1385                 }
1386         }
1387
1388         if (DEBUG_GTE(CMD, 2)) {
1389                 rprintf(FINFO,"cmd=%s machine=%s user=%s path=%s\n",
1390                         NS(shell_cmd), NS(shell_machine), NS(shell_user),
1391                         NS(remote_argv[0]));
1392         }
1393
1394         pid = do_cmd(shell_cmd, shell_machine, shell_user, remote_argv, remote_argc,
1395                      &f_in, &f_out);
1396
1397         /* if we're running an rsync server on the remote host over a
1398          * remote shell command, we need to do the RSYNCD protocol first */
1399         if (daemon_over_rsh) {
1400                 int tmpret;
1401                 tmpret = start_inband_exchange(f_in, f_out, shell_user, remote_argc, remote_argv);
1402                 if (tmpret < 0)
1403                         return tmpret;
1404         }
1405
1406         ret = client_run(f_in, f_out, pid, argc, argv);
1407
1408         fflush(stdout);
1409         fflush(stderr);
1410
1411         return ret;
1412 }
1413
1414
1415 static RETSIGTYPE sigusr1_handler(UNUSED(int val))
1416 {
1417         exit_cleanup(RERR_SIGNAL1);
1418 }
1419
1420 static RETSIGTYPE sigusr2_handler(UNUSED(int val))
1421 {
1422         if (!am_server)
1423                 output_summary();
1424         close_all();
1425         if (got_xfer_error)
1426                 _exit(RERR_PARTIAL);
1427         _exit(0);
1428 }
1429
1430 RETSIGTYPE remember_children(UNUSED(int val))
1431 {
1432 #ifdef WNOHANG
1433         int cnt, status;
1434         pid_t pid;
1435         /* An empty waitpid() loop was put here by Tridge and we could never
1436          * get him to explain why he put it in, so rather than taking it
1437          * out we're instead saving the child exit statuses for later use.
1438          * The waitpid() loop presumably eliminates all possibility of leaving
1439          * zombie children, maybe that's why he did it. */
1440         while ((pid = waitpid(-1, &status, WNOHANG)) > 0) {
1441                 /* save the child's exit status */
1442                 for (cnt = 0; cnt < MAXCHILDPROCS; cnt++) {
1443                         if (pid_stat_table[cnt].pid == 0) {
1444                                 pid_stat_table[cnt].pid = pid;
1445                                 pid_stat_table[cnt].status = status;
1446                                 break;
1447                         }
1448                 }
1449         }
1450 #endif
1451 #ifndef HAVE_SIGACTION
1452         signal(SIGCHLD, remember_children);
1453 #endif
1454 }
1455
1456
1457 /**
1458  * This routine catches signals and tries to send them to gdb.
1459  *
1460  * Because it's called from inside a signal handler it ought not to
1461  * use too many library routines.
1462  *
1463  * @todo Perhaps use "screen -X" instead/as well, to help people
1464  * debugging without easy access to X.  Perhaps use an environment
1465  * variable, or just call a script?
1466  *
1467  * @todo The /proc/ magic probably only works on Linux (and
1468  * Solaris?)  Can we be more portable?
1469  **/
1470 #ifdef MAINTAINER_MODE
1471 const char *get_panic_action(void)
1472 {
1473         const char *cmd_fmt = getenv("RSYNC_PANIC_ACTION");
1474
1475         if (cmd_fmt)
1476                 return cmd_fmt;
1477         else
1478                 return "xterm -display :0 -T Panic -n Panic "
1479                         "-e gdb /proc/%d/exe %d";
1480 }
1481
1482
1483 /**
1484  * Handle a fatal signal by launching a debugger, controlled by $RSYNC_PANIC_ACTION.
1485  *
1486  * This signal handler is only installed if we were configured with
1487  * --enable-maintainer-mode.  Perhaps it should always be on and we
1488  * should just look at the environment variable, but I'm a bit leery
1489  * of a signal sending us into a busy loop.
1490  **/
1491 static RETSIGTYPE rsync_panic_handler(UNUSED(int whatsig))
1492 {
1493         char cmd_buf[300];
1494         int ret;
1495
1496         snprintf(cmd_buf, sizeof cmd_buf, get_panic_action(),
1497                  getpid(), getpid());
1498
1499         /* Unless we failed to execute gdb, we allow the process to
1500          * continue.  I'm not sure if that's right. */
1501         ret = system(cmd_buf);
1502         if (ret)
1503                 _exit(ret);
1504 }
1505 #endif
1506
1507
1508 int main(int argc,char *argv[])
1509 {
1510         int ret;
1511         int orig_argc = argc;
1512         char **orig_argv = argv;
1513 #ifdef HAVE_SIGACTION
1514 # ifdef HAVE_SIGPROCMASK
1515         sigset_t sigmask;
1516
1517         sigemptyset(&sigmask);
1518 # endif
1519         sigact.sa_flags = SA_NOCLDSTOP;
1520 #endif
1521         SIGACTMASK(SIGUSR1, sigusr1_handler);
1522         SIGACTMASK(SIGUSR2, sigusr2_handler);
1523         SIGACTMASK(SIGCHLD, remember_children);
1524 #ifdef MAINTAINER_MODE
1525         SIGACTMASK(SIGSEGV, rsync_panic_handler);
1526         SIGACTMASK(SIGFPE, rsync_panic_handler);
1527         SIGACTMASK(SIGABRT, rsync_panic_handler);
1528         SIGACTMASK(SIGBUS, rsync_panic_handler);
1529 #endif
1530
1531         starttime = time(NULL);
1532         our_uid = MY_UID();
1533         our_gid = MY_GID();
1534         am_root = our_uid == 0;
1535
1536         memset(&stats, 0, sizeof(stats));
1537
1538         if (argc < 2) {
1539                 usage(FERROR);
1540                 exit_cleanup(RERR_SYNTAX);
1541         }
1542
1543         /* Get the umask for use in permission calculations.  We no longer set
1544          * it to zero; that is ugly and pointless now that all the callers that
1545          * relied on it have been reeducated to work with default ACLs. */
1546         umask(orig_umask = umask(0));
1547
1548 #if defined CONFIG_LOCALE && defined HAVE_SETLOCALE
1549         setlocale(LC_CTYPE, "");
1550 #endif
1551
1552         if (!parse_arguments(&argc, (const char ***) &argv)) {
1553                 /* FIXME: We ought to call the same error-handling
1554                  * code here, rather than relying on getopt. */
1555                 option_error();
1556                 exit_cleanup(RERR_SYNTAX);
1557         }
1558
1559         SIGACTMASK(SIGINT, sig_int);
1560         SIGACTMASK(SIGHUP, sig_int);
1561         SIGACTMASK(SIGTERM, sig_int);
1562 #if defined HAVE_SIGACTION && HAVE_SIGPROCMASK
1563         sigprocmask(SIG_UNBLOCK, &sigmask, NULL);
1564 #endif
1565
1566         /* Ignore SIGPIPE; we consistently check error codes and will
1567          * see the EPIPE. */
1568         SIGACTION(SIGPIPE, SIG_IGN);
1569 #ifdef SIGXFSZ
1570         SIGACTION(SIGXFSZ, SIG_IGN);
1571 #endif
1572
1573         /* Initialize change_dir() here because on some old systems getcwd
1574          * (implemented by forking "pwd" and reading its output) doesn't
1575          * work when there are other child processes.  Also, on all systems
1576          * that implement getcwd that way "pwd" can't be found after chroot. */
1577         change_dir(NULL, CD_NORMAL);
1578
1579         init_flist();
1580
1581         if ((write_batch || read_batch) && !am_server) {
1582                 if (write_batch)
1583                         write_batch_shell_file(orig_argc, orig_argv, argc);
1584
1585                 if (read_batch && strcmp(batch_name, "-") == 0)
1586                         batch_fd = STDIN_FILENO;
1587                 else {
1588                         batch_fd = do_open(batch_name,
1589                                    write_batch ? O_WRONLY | O_CREAT | O_TRUNC
1590                                    : O_RDONLY, S_IRUSR | S_IWUSR);
1591                 }
1592                 if (batch_fd < 0) {
1593                         rsyserr(FERROR, errno, "Batch file %s open error",
1594                                 full_fname(batch_name));
1595                         exit_cleanup(RERR_FILEIO);
1596                 }
1597                 if (read_batch)
1598                         read_stream_flags(batch_fd);
1599                 else
1600                         write_stream_flags(batch_fd);
1601         }
1602         if (write_batch < 0)
1603                 dry_run = 1;
1604
1605         if (am_server) {
1606 #ifdef ICONV_CONST
1607                 setup_iconv();
1608 #endif
1609         } else if (am_daemon)
1610                 return daemon_main();
1611
1612         if (am_server && protect_args) {
1613                 char buf[MAXPATHLEN];
1614                 protect_args = 2;
1615                 read_args(STDIN_FILENO, NULL, buf, sizeof buf, 1, &argv, &argc, NULL);
1616                 if (!parse_arguments(&argc, (const char ***) &argv)) {
1617                         option_error();
1618                         exit_cleanup(RERR_SYNTAX);
1619                 }
1620         }
1621
1622         if (argc < 1) {
1623                 usage(FERROR);
1624                 exit_cleanup(RERR_SYNTAX);
1625         }
1626
1627         if (am_server) {
1628                 set_nonblocking(STDIN_FILENO);
1629                 set_nonblocking(STDOUT_FILENO);
1630                 if (am_daemon)
1631                         return start_daemon(STDIN_FILENO, STDOUT_FILENO);
1632                 start_server(STDIN_FILENO, STDOUT_FILENO, argc, argv);
1633         }
1634
1635         ret = start_client(argc, argv);
1636         if (ret == -1)
1637                 exit_cleanup(RERR_STARTCLIENT);
1638         else
1639                 exit_cleanup(ret);
1640
1641         return ret;
1642 }