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, 2004, 2005, 2006 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 2 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, write to the Free Software Foundation, Inc.,
  21  * 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.
  22  */
  23
  24 #include "rsync.h"
  25 #if defined CONFIG_LOCALE && defined HAVE_LOCALE_H
  26 #include <locale.h>
  27 #endif
  28
  29 extern int verbose;
  30 extern int dry_run;
  31 extern int list_only;
  32 extern int am_root;
  33 extern int am_server;
  34 extern int am_sender;
  35 extern int am_generator;
  36 extern int am_daemon;
  37 extern int blocking_io;
  38 extern int remove_source_files;
  39 extern int daemon_over_rsh;
  40 extern int need_messages_from_generator;
  41 extern int kluge_around_eof;
  42 extern int do_stats;
  43 extern int log_got_error;
  44 extern int module_id;
  45 extern int copy_links;
  46 extern int copy_dirlinks;
  47 extern int keep_dirlinks;
  48 extern int preserve_hard_links;
  49 extern int protocol_version;
  50 extern int recurse;
  51 extern int relative_paths;
  52 extern int sanitize_paths;
  53 extern int curr_dir_depth;
  54 extern int curr_dir_len;
  55 extern int module_id;
  56 extern int rsync_port;
  57 extern int whole_file;
  58 extern int read_batch;
  59 extern int write_batch;
  60 extern int batch_fd;
  61 extern int batch_gen_fd;
  62 extern int filesfrom_fd;
  63 extern pid_t cleanup_child_pid;
  64 extern struct stats stats;
  65 extern char *filesfrom_host;
  66 extern char *partial_dir;
  67 extern char *basis_dir[];
  68 extern char *rsync_path;
  69 extern char *shell_cmd;
  70 extern char *batch_name;
  71 extern char *password_file;
  72 extern char curr_dir[MAXPATHLEN];
  73 extern struct filter_list_struct server_filter_list;
  74
  75 int local_server = 0;
  76 int new_root_dir = 0;
  77 mode_t orig_umask = 0;
  78 struct file_list *the_file_list;
  79
  80 /* There's probably never more than at most 2 outstanding child processes,
  81  * but set it higher, just in case. */
  82 #define MAXCHILDPROCS 7
  83
  84 #ifdef HAVE_SIGACTION
  85 # ifdef HAVE_SIGPROCMASK
  86 #  define SIGACTMASK(n,h) SIGACTION(n,h), sigaddset(&sigmask,(n))
  87 # else
  88 #  define SIGACTMASK(n,h) SIGACTION(n,h)
  89 # endif
  90 static struct sigaction sigact;
  91 #endif
  92
  93 struct pid_status {
  94         pid_t pid;
  95         int status;
  96 } pid_stat_table[MAXCHILDPROCS];
  97
  98 static time_t starttime, endtime;
  99 static int64 total_read, total_written;
 100
 101 static void show_malloc_stats(void);
 102
 103 /* Works like waitpid(), but if we already harvested the child pid in our
 104  * remember_children(), we succeed instead of returning an error. */
 105 pid_t wait_process(pid_t pid, int *status_ptr, int flags)
 106 {
 107         pid_t waited_pid;
 108
 109         do {
 110                 waited_pid = waitpid(pid, status_ptr, flags);
 111         } while (waited_pid == -1 && errno == EINTR);
 112
 113         if (waited_pid == -1 && errno == ECHILD) {
 114                 /* Status of requested child no longer available:  check to
 115                  * see if it was processed by remember_children(). */
 116                 int cnt;
 117                 for (cnt = 0; cnt < MAXCHILDPROCS; cnt++) {
 118                         if (pid == pid_stat_table[cnt].pid) {
 119                                 *status_ptr = pid_stat_table[cnt].status;
 120                                 pid_stat_table[cnt].pid = 0;
 121                                 return pid;
 122                         }
 123                 }
 124         }
 125
 126         return waited_pid;
 127 }
 128
 129 /* Wait for a process to exit, calling io_flush while waiting. */
 130 static void wait_process_with_flush(pid_t pid, int *exit_code_ptr)
 131 {
 132         pid_t waited_pid;
 133         int status;
 134
 135         while ((waited_pid = wait_process(pid, &status, WNOHANG)) == 0) {
 136                 msleep(20);
 137                 io_flush(FULL_FLUSH);
 138         }
 139
 140         /* TODO: If the child exited on a signal, then log an
 141          * appropriate error message.  Perhaps we should also accept a
 142          * message describing the purpose of the child.  Also indicate
 143          * this to the caller so that they know something went wrong. */
 144         if (waited_pid < 0) {
 145                 rsyserr(FERROR, errno, "waitpid");
 146                 *exit_code_ptr = RERR_WAITCHILD;
 147         } else if (!WIFEXITED(status)) {
 148 #ifdef WCOREDUMP
 149                 if (WCOREDUMP(status))
 150                         *exit_code_ptr = RERR_CRASHED;
 151                 else
 152 #endif
 153                 if (WIFSIGNALED(status))
 154                         *exit_code_ptr = RERR_TERMINATED;
 155                 else
 156                         *exit_code_ptr = RERR_WAITCHILD;
 157         } else
 158                 *exit_code_ptr = WEXITSTATUS(status);
 159 }
 160
 161 /* This function gets called from all 3 processes.  We want the client side
 162  * to actually output the text, but the sender is the only process that has
 163  * all the stats we need.  So, if we're a client sender, we do the report.
 164  * If we're a server sender, we write the stats on the supplied fd.  If
 165  * we're the client receiver we read the stats from the supplied fd and do
 166  * the report.  All processes might also generate a set of debug stats, if
 167  * the verbose level is high enough (this is the only thing that the
 168  * generator process and the server receiver ever do here). */
 169 static void handle_stats(int f)
 170 {
 171         endtime = time(NULL);
 172
 173         /* Cache two stats because the read/write code can change it. */
 174         total_read = stats.total_read;
 175         total_written = stats.total_written;
 176
 177         if (do_stats && verbose > 1) {
 178                 /* These come out from every process */
 179                 show_malloc_stats();
 180                 show_flist_stats();
 181         }
 182
 183         if (am_generator)
 184                 return;
 185
 186         if (am_daemon) {
 187                 if (f == -1 || !am_sender)
 188                         return;
 189         }
 190
 191         if (am_server) {
 192                 if (am_sender) {
 193                         write_longint(f, total_read);
 194                         write_longint(f, total_written);
 195                         write_longint(f, stats.total_size);
 196                         if (protocol_version >= 29) {
 197                                 write_longint(f, stats.flist_buildtime);
 198                                 write_longint(f, stats.flist_xfertime);
 199                         }
 200                 }
 201                 return;
 202         }
 203
 204         /* this is the client */
 205
 206         if (f < 0 && !am_sender) /* e.g. when we got an empty file list. */
 207                 ;
 208         else if (!am_sender) {
 209                 /* Read the first two in opposite order because the meaning of
 210                  * read/write swaps when switching from sender to receiver. */
 211                 total_written = read_longint(f);
 212                 total_read = read_longint(f);
 213                 stats.total_size = read_longint(f);
 214                 if (protocol_version >= 29) {
 215                         stats.flist_buildtime = read_longint(f);
 216                         stats.flist_xfertime = read_longint(f);
 217                 }
 218         } else if (write_batch) {
 219                 /* The --read-batch process is going to be a client
 220                  * receiver, so we need to give it the stats. */
 221                 write_longint(batch_fd, total_read);
 222                 write_longint(batch_fd, total_written);
 223                 write_longint(batch_fd, stats.total_size);
 224                 if (protocol_version >= 29) {
 225                         write_longint(batch_fd, stats.flist_buildtime);
 226                         write_longint(batch_fd, stats.flist_xfertime);
 227                 }
 228         }
 229 }
 230
 231 static void output_summary(void)
 232 {
 233         if (do_stats) {
 234                 rprintf(FCLIENT, "\n");
 235                 rprintf(FINFO,"Number of files: %d\n", stats.num_files);
 236                 rprintf(FINFO,"Number of files transferred: %d\n",
 237                         stats.num_transferred_files);
 238                 rprintf(FINFO,"Total file size: %s bytes\n",
 239                         human_num(stats.total_size));
 240                 rprintf(FINFO,"Total transferred file size: %s bytes\n",
 241                         human_num(stats.total_transferred_size));
 242                 rprintf(FINFO,"Literal data: %s bytes\n",
 243                         human_num(stats.literal_data));
 244                 rprintf(FINFO,"Matched data: %s bytes\n",
 245                         human_num(stats.matched_data));
 246                 rprintf(FINFO,"File list size: %s\n",
 247                         human_num(stats.flist_size));
 248                 if (stats.flist_buildtime) {
 249                         rprintf(FINFO,
 250                                 "File list generation time: %.3f seconds\n",
 251                                 (double)stats.flist_buildtime / 1000);
 252                         rprintf(FINFO,
 253                                 "File list transfer time: %.3f seconds\n",
 254                                 (double)stats.flist_xfertime / 1000);
 255                 }
 256                 rprintf(FINFO,"Total bytes sent: %s\n",
 257                         human_num(total_written));
 258                 rprintf(FINFO,"Total bytes received: %s\n",
 259                         human_num(total_read));
 260         }
 261
 262         if (verbose || do_stats) {
 263                 rprintf(FCLIENT, "\n");
 264                 rprintf(FINFO,
 265                         "sent %s bytes  received %s bytes  %s bytes/sec\n",
 266                         human_num(total_written), human_num(total_read),
 267                         human_dnum((total_written + total_read)/(0.5 + (endtime - starttime)), 2));
 268                 rprintf(FINFO, "total size is %s  speedup is %.2f\n",
 269                         human_num(stats.total_size),
 270                         (double)stats.total_size / (total_written+total_read));
 271         }
 272
 273         fflush(stdout);
 274         fflush(stderr);
 275 }
 276
 277
 278 /**
 279  * If our C library can get malloc statistics, then show them to FINFO
 280  **/
 281 static void show_malloc_stats(void)
 282 {
 283 #ifdef HAVE_MALLINFO
 284         struct mallinfo mi;
 285
 286         mi = mallinfo();
 287
 288         rprintf(FCLIENT, "\n");
 289         rprintf(FINFO, RSYNC_NAME "[%d] (%s%s%s) heap statistics:\n",
 290                 getpid(), am_server ? "server " : "",
 291                 am_daemon ? "daemon " : "", who_am_i());
 292         rprintf(FINFO, "  arena:     %10ld   (bytes from sbrk)\n",
 293                 (long)mi.arena);
 294         rprintf(FINFO, "  ordblks:   %10ld   (chunks not in use)\n",
 295                 (long)mi.ordblks);
 296         rprintf(FINFO, "  smblks:    %10ld\n",
 297                 (long)mi.smblks);
 298         rprintf(FINFO, "  hblks:     %10ld   (chunks from mmap)\n",
 299                 (long)mi.hblks);
 300         rprintf(FINFO, "  hblkhd:    %10ld   (bytes from mmap)\n",
 301                 (long)mi.hblkhd);
 302         rprintf(FINFO, "  allmem:    %10ld   (bytes from sbrk + mmap)\n",
 303                 (long)mi.arena + mi.hblkhd);
 304         rprintf(FINFO, "  usmblks:   %10ld\n",
 305                 (long)mi.usmblks);
 306         rprintf(FINFO, "  fsmblks:   %10ld\n",
 307                 (long)mi.fsmblks);
 308         rprintf(FINFO, "  uordblks:  %10ld   (bytes used)\n",
 309                 (long)mi.uordblks);
 310         rprintf(FINFO, "  fordblks:  %10ld   (bytes free)\n",
 311                 (long)mi.fordblks);
 312         rprintf(FINFO, "  keepcost:  %10ld   (bytes in releasable chunk)\n",
 313                 (long)mi.keepcost);
 314 #endif /* HAVE_MALLINFO */
 315 }
 316
 317
 318 /* Start the remote shell.   cmd may be NULL to use the default. */
 319 static pid_t do_cmd(char *cmd, char *machine, char *user, char *path,
 320                     int *f_in, int *f_out)
 321 {
 322         int i, argc = 0;
 323         char *args[MAX_ARGS];
 324         pid_t ret;
 325         char *dir = NULL;
 326         int dash_l_set = 0;
 327
 328         if (!read_batch && !local_server) {
 329                 char *t, *f, in_quote = '\0';
 330                 char *rsh_env = getenv(RSYNC_RSH_ENV);
 331                 if (!cmd)
 332                         cmd = rsh_env;
 333                 if (!cmd)
 334                         cmd = RSYNC_RSH;
 335                 cmd = strdup(cmd);
 336                 if (!cmd)
 337                         goto oom;
 338
 339                 for (t = f = cmd; *f; f++) {
 340                         if (*f == ' ')
 341                                 continue;
 342                         /* Comparison leaves rooms for server_options(). */
 343                         if (argc >= MAX_ARGS - MAX_SERVER_ARGS) {
 344                                 rprintf(FERROR, "internal: args[] overflowed in do_cmd()\n");
 345                                 exit_cleanup(RERR_SYNTAX);
 346                         }
 347                         args[argc++] = t;
 348                         while (*f != ' ' || in_quote) {
 349                                 if (!*f) {
 350                                         if (in_quote) {
 351                                                 rprintf(FERROR,
 352                                                     "Missing trailing-%c in remote-shell command.\n",
 353                                                     in_quote);
 354                                                 exit_cleanup(RERR_SYNTAX);
 355                                         }
 356                                         f--;
 357                                         break;
 358                                 }
 359                                 if (*f == '\'' || *f == '"') {
 360                                         if (!in_quote) {
 361                                                 in_quote = *f++;
 362                                                 continue;
 363                                         }
 364                                         if (*f == in_quote && *++f != in_quote) {
 365                                                 in_quote = '\0';
 366                                                 continue;
 367                                         }
 368                                 }
 369                                 *t++ = *f++;
 370                         }
 371                         *t++ = '\0';
 372                 }
 373
 374                 /* check to see if we've already been given '-l user' in
 375                  * the remote-shell command */
 376                 for (i = 0; i < argc-1; i++) {
 377                         if (!strcmp(args[i], "-l") && args[i+1][0] != '-')
 378                                 dash_l_set = 1;
 379                 }
 380
 381 #ifdef HAVE_REMSH
 382                 /* remsh (on HPUX) takes the arguments the other way around */
 383                 args[argc++] = machine;
 384                 if (user && !(daemon_over_rsh && dash_l_set)) {
 385                         args[argc++] = "-l";
 386                         args[argc++] = user;
 387                 }
 388 #else
 389                 if (user && !(daemon_over_rsh && dash_l_set)) {
 390                         args[argc++] = "-l";
 391                         args[argc++] = user;
 392                 }
 393                 args[argc++] = machine;
 394 #endif
 395
 396                 args[argc++] = rsync_path;
 397
 398                 if (blocking_io < 0) {
 399                         char *cp;
 400                         if ((cp = strrchr(cmd, '/')) != NULL)
 401                                 cp++;
 402                         else
 403                                 cp = cmd;
 404                         if (strcmp(cp, "rsh") == 0 || strcmp(cp, "remsh") == 0)
 405                                 blocking_io = 1;
 406                 }
 407
 408                 server_options(args,&argc);
 409
 410                 if (argc >= MAX_ARGS - 2) {
 411                         rprintf(FERROR, "internal: args[] overflowed in do_cmd()\n");
 412                         exit_cleanup(RERR_SYNTAX);
 413                 }
 414         }
 415
 416         args[argc++] = ".";
 417
 418         if (!daemon_over_rsh && path && *path)
 419                 args[argc++] = path;
 420
 421         args[argc] = NULL;
 422
 423         if (verbose > 3) {
 424                 for (i = 0; i < argc; i++)
 425                         rprintf(FCLIENT, "cmd[%d]=%s ", i, args[i]);
 426                 rprintf(FCLIENT, "\n");
 427         }
 428
 429         if (read_batch) {
 430                 int from_gen_pipe[2];
 431                 if (fd_pair(from_gen_pipe) < 0) {
 432                         rsyserr(FERROR, errno, "pipe");
 433                         exit_cleanup(RERR_IPC);
 434                 }
 435                 batch_gen_fd = from_gen_pipe[0];
 436                 *f_out = from_gen_pipe[1];
 437                 *f_in = batch_fd;
 438                 ret = -1; /* no child pid */
 439         } else if (local_server) {
 440                 /* If the user didn't request --[no-]whole-file, force
 441                  * it on, but only if we're not batch processing. */
 442                 if (whole_file < 0 && !write_batch)
 443                         whole_file = 1;
 444                 ret = local_child(argc, args, f_in, f_out, child_main);
 445         } else
 446                 ret = piped_child(args,f_in,f_out);
 447
 448         if (dir)
 449                 free(dir);
 450
 451         return ret;
 452
 453   oom:
 454         out_of_memory("do_cmd");
 455         return 0; /* not reached */
 456 }
 457
 458 /* The receiving side operates in one of two modes:
 459  *
 460  * 1. it receives any number of files into a destination directory,
 461  * placing them according to their names in the file-list.
 462  *
 463  * 2. it receives a single file and saves it using the name in the
 464  * destination path instead of its file-list name.  This requires a
 465  * "local name" for writing out the destination file.
 466  *
 467  * So, our task is to figure out what mode/local-name we need.
 468  * For mode 1, we change into the destination directory and return NULL.
 469  * For mode 2, we change into the directory containing the destination
 470  * file (if we aren't already there) and return the local-name. */
 471 static char *get_local_name(struct file_list *flist, char *dest_path)
 472 {
 473         STRUCT_STAT st;
 474         int statret;
 475         char *cp;
 476
 477         if (verbose > 2) {
 478                 rprintf(FINFO, "get_local_name count=%d %s\n",
 479                         flist->count, NS(dest_path));
 480         }
 481
 482         if (!dest_path || list_only)
 483                 return NULL;
 484
 485         /* See what currently exists at the destination. */
 486         if ((statret = do_stat(dest_path, &st)) == 0) {
 487                 /* If the destination is a dir, enter it and use mode 1. */
 488                 if (S_ISDIR(st.st_mode)) {
 489                         if (!push_dir(dest_path, 0)) {
 490                                 rsyserr(FERROR, errno, "push_dir#1 %s failed",
 491                                         full_fname(dest_path));
 492                                 exit_cleanup(RERR_FILESELECT);
 493                         }
 494                         return NULL;
 495                 }
 496                 if (flist->count > 1) {
 497                         rprintf(FERROR,
 498                                 "ERROR: destination must be a directory when"
 499                                 " copying more than 1 file\n");
 500                         exit_cleanup(RERR_FILESELECT);
 501                 }
 502                 /* Caution: flist->count could be 0! */
 503                 if (flist->count == 1 && S_ISDIR(flist->files[0]->mode)) {
 504                         rprintf(FERROR,
 505                                 "ERROR: cannot overwrite non-directory"
 506                                 " with a directory\n");
 507                         exit_cleanup(RERR_FILESELECT);
 508                 }
 509         } else if (errno != ENOENT) {
 510                 /* If we don't know what's at the destination, fail. */
 511                 rsyserr(FERROR, errno, "ERROR: cannot stat destination %s",
 512                         full_fname(dest_path));
 513                 exit_cleanup(RERR_FILESELECT);
 514         }
 515
 516         cp = strrchr(dest_path, '/');
 517
 518         /* If we need a destination directory because the transfer is not
 519          * of a single non-directory or the user has requested one via a
 520          * destination path ending in a slash, create one and use mode 1. */
 521         if (flist->count > 1 || (cp && !cp[1])) {
 522                 /* Lop off the final slash (if any). */
 523                 if (cp && !cp[1])
 524                         *cp = '\0';
 525
 526                 if (statret == 0) {
 527                         rprintf(FERROR,
 528                             "ERROR: destination path is not a directory\n");
 529                         exit_cleanup(RERR_SYNTAX);
 530                 }
 531
 532                 if (mkdir_defmode(dest_path) != 0) {
 533                         rsyserr(FERROR, errno, "mkdir %s failed",
 534                                 full_fname(dest_path));
 535                         exit_cleanup(RERR_FILEIO);
 536                 }
 537
 538                 new_root_dir = 1;
 539
 540                 if (verbose)
 541                         rprintf(FINFO, "created directory %s\n", dest_path);
 542
 543                 if (dry_run) {
 544                         /* Indicate that dest dir doesn't really exist. */
 545                         dry_run++;
 546                 }
 547
 548                 if (!push_dir(dest_path, dry_run > 1)) {
 549                         rsyserr(FERROR, errno, "push_dir#2 %s failed",
 550                                 full_fname(dest_path));
 551                         exit_cleanup(RERR_FILESELECT);
 552                 }
 553
 554                 return NULL;
 555         }
 556
 557         /* Otherwise, we are writing a single file, possibly on top of an
 558          * existing non-directory.  Change to the item's parent directory
 559          * (if it has a path component), return the basename of the
 560          * destination file as the local name, and use mode 2. */
 561         if (!cp)
 562                 return dest_path;
 563
 564         if (cp == dest_path)
 565                 dest_path = "/";
 566
 567         *cp = '\0';
 568         if (!push_dir(dest_path, 0)) {
 569                 rsyserr(FERROR, errno, "push_dir#3 %s failed",
 570                         full_fname(dest_path));
 571                 exit_cleanup(RERR_FILESELECT);
 572         }
 573         *cp = '/';
 574
 575         return cp + 1;
 576 }
 577
 578 /* Call this if the destination dir (which is assumed to be in curr_dir)
 579  * does not yet exist and we can't create it due to being in dry-run
 580  * mode.  We'll fix dirs that can be relative to the non-existent dir. */
 581 static void fix_basis_dirs(void)
 582 {
 583         char **dir, *new, *slash;
 584         int len;
 585
 586         if (dry_run <= 1)
 587                 return;
 588
 589         slash = strrchr(curr_dir, '/');
 590
 591         for (dir = basis_dir; *dir; dir++) {
 592                 if (**dir == '/')
 593                         continue;
 594                 len = curr_dir_len + 1 + strlen(*dir) + 1;
 595                 if (!(new = new_array(char, len)))
 596                         out_of_memory("fix_basis_dirs");
 597                 if (slash && strncmp(*dir, "../", 3) == 0) {
 598                     /* We want to remove only one leading "../" prefix for
 599                      * the directory we couldn't create in dry-run mode:
 600                      * this ensures that any other ".." references get
 601                      * evaluated the same as they would for a live copy. */
 602                     *slash = '\0';
 603                     pathjoin(new, len, curr_dir, *dir + 3);
 604                     *slash = '/';
 605                 } else
 606                     pathjoin(new, len, curr_dir, *dir);
 607                 *dir = new;
 608         }
 609 }
 610
 611 /* This is only called by the sender. */
 612 static void read_final_goodbye(int f_in, int f_out)
 613 {
 614         int i;
 615
 616         if (protocol_version < 29)
 617                 i = read_int(f_in);
 618         else {
 619                 while ((i = read_int(f_in)) == the_file_list->count
 620                     && read_shortint(f_in) == ITEM_IS_NEW) {
 621                         /* Forward the keep-alive (no-op) to the receiver. */
 622                         write_int(f_out, the_file_list->count);
 623                         write_shortint(f_out, ITEM_IS_NEW);
 624                 }
 625         }
 626
 627         if (i != NDX_DONE) {
 628                 rprintf(FERROR, "Invalid packet at end of run (%d) [%s]\n",
 629                         i, who_am_i());
 630                 exit_cleanup(RERR_PROTOCOL);
 631         }
 632 }
 633
 634 static void do_server_sender(int f_in, int f_out, int argc, char *argv[])
 635 {
 636         struct file_list *flist;
 637         char *dir = argv[0];
 638
 639         if (verbose > 2) {
 640                 rprintf(FINFO, "server_sender starting pid=%ld\n",
 641                         (long)getpid());
 642         }
 643
 644         if (am_daemon && lp_write_only(module_id)) {
 645                 rprintf(FERROR, "ERROR: module is write only\n");
 646                 exit_cleanup(RERR_SYNTAX);
 647                 return;
 648         }
 649         if (am_daemon && lp_read_only(module_id) && remove_source_files) {
 650                 rprintf(FERROR,
 651                     "ERROR: --remove-%s-files cannot be used with a read-only module\n",
 652                     remove_source_files == 1 ? "source" : "sent");
 653                 exit_cleanup(RERR_SYNTAX);
 654                 return;
 655         }
 656
 657         if (!relative_paths) {
 658                 if (!push_dir(dir, 0)) {
 659                         rsyserr(FERROR, errno, "push_dir#3 %s failed",
 660                                 full_fname(dir));
 661                         exit_cleanup(RERR_FILESELECT);
 662                 }
 663         }
 664         argc--;
 665         argv++;
 666
 667         if (argc == 0 && (recurse || list_only)) {
 668                 argc = 1;
 669                 argv--;
 670                 argv[0] = ".";
 671         }
 672
 673         flist = send_file_list(f_out,argc,argv);
 674         if (!flist || flist->count == 0)
 675                 exit_cleanup(0);
 676         the_file_list = flist;
 677
 678         io_start_buffering_in();
 679         io_start_buffering_out();
 680
 681         send_files(flist,f_out,f_in);
 682         io_flush(FULL_FLUSH);
 683         handle_stats(f_out);
 684         if (protocol_version >= 24)
 685                 read_final_goodbye(f_in, f_out);
 686         io_flush(FULL_FLUSH);
 687         exit_cleanup(0);
 688 }
 689
 690
 691 static int do_recv(int f_in,int f_out,struct file_list *flist,char *local_name)
 692 {
 693         int pid;
 694         int exit_code = 0;
 695         int error_pipe[2];
 696
 697         /* The receiving side mustn't obey this, or an existing symlink that
 698          * points to an identical file won't be replaced by the referent. */
 699         copy_links = copy_dirlinks = 0;
 700
 701 #ifdef SUPPORT_HARD_LINKS
 702         if (preserve_hard_links)
 703                 match_hard_links();
 704 #endif
 705
 706         if (fd_pair(error_pipe) < 0) {
 707                 rsyserr(FERROR, errno, "pipe failed in do_recv");
 708                 exit_cleanup(RERR_IPC);
 709         }
 710
 711         io_flush(NORMAL_FLUSH);
 712
 713         if ((pid = do_fork()) == -1) {
 714                 rsyserr(FERROR, errno, "fork failed in do_recv");
 715                 exit_cleanup(RERR_IPC);
 716         }
 717
 718         if (pid == 0) {
 719                 close(error_pipe[0]);
 720                 if (f_in != f_out)
 721                         close(f_out);
 722
 723                 /* we can't let two processes write to the socket at one time */
 724                 close_multiplexing_out();
 725
 726                 /* set place to send errors */
 727                 set_msg_fd_out(error_pipe[1]);
 728
 729                 recv_files(f_in, flist, local_name);
 730                 io_flush(FULL_FLUSH);
 731                 handle_stats(f_in);
 732
 733                 send_msg(MSG_DONE, "", 0);
 734                 io_flush(FULL_FLUSH);
 735
 736                 /* Handle any keep-alive packets from the post-processing work
 737                  * that the generator does. */
 738                 if (protocol_version >= 29) {
 739                         kluge_around_eof = -1;
 740
 741                         /* This should only get stopped via a USR2 signal. */
 742                         while (read_int(f_in) == flist->count
 743                             && read_shortint(f_in) == ITEM_IS_NEW) {}
 744
 745                         rprintf(FERROR, "Invalid packet at end of run [%s]\n",
 746                                 who_am_i());
 747                         exit_cleanup(RERR_PROTOCOL);
 748                 }
 749
 750                 /* Finally, we go to sleep until our parent kills us with a
 751                  * USR2 signal.  We sleep for a short time, as on some OSes
 752                  * a signal won't interrupt a sleep! */
 753                 while (1)
 754                         msleep(20);
 755         }
 756
 757         am_generator = 1;
 758         close_multiplexing_in();
 759         if (write_batch && !am_server)
 760                 stop_write_batch();
 761
 762         close(error_pipe[1]);
 763         if (f_in != f_out)
 764                 close(f_in);
 765
 766         io_start_buffering_out();
 767
 768         set_msg_fd_in(error_pipe[0]);
 769
 770         generate_files(f_out, flist, local_name);
 771
 772         handle_stats(-1);
 773         io_flush(FULL_FLUSH);
 774         if (protocol_version >= 24) {
 775                 /* send a final goodbye message */
 776                 write_int(f_out, NDX_DONE);
 777         }
 778         io_flush(FULL_FLUSH);
 779
 780         set_msg_fd_in(-1);
 781         kill(pid, SIGUSR2);
 782         wait_process_with_flush(pid, &exit_code);
 783         return exit_code;
 784 }
 785
 786 static void do_server_recv(int f_in, int f_out, int argc,char *argv[])
 787 {
 788         int exit_code;
 789         struct file_list *flist;
 790         char *local_name = NULL;
 791         char *dir = NULL;
 792         int save_verbose = verbose;
 793
 794         if (filesfrom_fd >= 0) {
 795                 /* We can't mix messages with files-from data on the socket,
 796                  * so temporarily turn off verbose messages. */
 797                 verbose = 0;
 798         }
 799
 800         if (verbose > 2) {
 801                 rprintf(FINFO, "server_recv(%d) starting pid=%ld\n",
 802                         argc, (long)getpid());
 803         }
 804
 805         if (am_daemon && lp_read_only(module_id)) {
 806                 rprintf(FERROR,"ERROR: module is read only\n");
 807                 exit_cleanup(RERR_SYNTAX);
 808                 return;
 809         }
 810
 811         if (argc > 0) {
 812                 dir = argv[0];
 813                 argc--;
 814                 argv++;
 815                 if (!am_daemon && !push_dir(dir, 0)) {
 816                         rsyserr(FERROR, errno, "push_dir#4 %s failed",
 817                                 full_fname(dir));
 818                         exit_cleanup(RERR_FILESELECT);
 819                 }
 820         }
 821
 822         io_start_buffering_in();
 823         recv_filter_list(f_in);
 824
 825         if (filesfrom_fd >= 0) {
 826                 /* We need to send the files-from names to the sender at the
 827                  * same time that we receive the file-list from them, so we
 828                  * need the IO routines to automatically write out the names
 829                  * onto our f_out socket as we read the file-list.  This
 830                  * avoids both deadlock and extra delays/buffers. */
 831                 io_set_filesfrom_fds(filesfrom_fd, f_out);
 832                 filesfrom_fd = -1;
 833         }
 834
 835         flist = recv_file_list(f_in);
 836         verbose = save_verbose;
 837         if (!flist) {
 838                 rprintf(FERROR,"server_recv: recv_file_list error\n");
 839                 exit_cleanup(RERR_FILESELECT);
 840         }
 841         the_file_list = flist;
 842
 843         if (argc > 0)
 844                 local_name = get_local_name(flist,argv[0]);
 845
 846         /* Now that we know what our destination directory turned out to be,
 847          * we can sanitize the --link-/copy-/compare-dest args correctly. */
 848         if (sanitize_paths) {
 849                 char **dir;
 850                 for (dir = basis_dir; *dir; dir++) {
 851                         *dir = sanitize_path(NULL, *dir, NULL, curr_dir_depth, NULL);
 852                 }
 853                 if (partial_dir) {
 854                         partial_dir = sanitize_path(NULL, partial_dir, NULL, curr_dir_depth, NULL);
 855                 }
 856         }
 857         fix_basis_dirs();
 858
 859         if (server_filter_list.head) {
 860                 char **dir;
 861                 struct filter_list_struct *elp = &server_filter_list;
 862
 863                 for (dir = basis_dir; *dir; dir++) {
 864                         if (check_filter(elp, *dir, 1) < 0)
 865                                 goto options_rejected;
 866                 }
 867                 if (partial_dir && *partial_dir == '/'
 868                  && check_filter(elp, partial_dir, 1) < 0) {
 869                     options_rejected:
 870                         rprintf(FERROR,
 871                                 "Your options have been rejected by the server.\n");
 872                         exit_cleanup(RERR_SYNTAX);
 873                 }
 874         }
 875
 876         exit_code = do_recv(f_in,f_out,flist,local_name);
 877         exit_cleanup(exit_code);
 878 }
 879
 880
 881 int child_main(int argc, char *argv[])
 882 {
 883         start_server(STDIN_FILENO, STDOUT_FILENO, argc, argv);
 884         return 0;
 885 }
 886
 887
 888 void start_server(int f_in, int f_out, int argc, char *argv[])
 889 {
 890         set_nonblocking(f_in);
 891         set_nonblocking(f_out);
 892
 893         io_set_sock_fds(f_in, f_out);
 894         setup_protocol(f_out, f_in);
 895 #if defined HAVE_ICONV_OPEN && defined HAVE_ICONV_H
 896         setup_iconv();
 897 #endif
 898
 899         if (protocol_version >= 23)
 900                 io_start_multiplex_out();
 901
 902         if (am_sender) {
 903                 keep_dirlinks = 0; /* Must be disabled on the sender. */
 904                 if (need_messages_from_generator)
 905                         io_start_multiplex_in();
 906                 recv_filter_list(f_in);
 907                 do_server_sender(f_in, f_out, argc, argv);
 908         } else
 909                 do_server_recv(f_in, f_out, argc, argv);
 910         exit_cleanup(0);
 911 }
 912
 913
 914 /*
 915  * This is called once the connection has been negotiated.  It is used
 916  * for rsyncd, remote-shell, and local connections.
 917  */
 918 int client_run(int f_in, int f_out, pid_t pid, int argc, char *argv[])
 919 {
 920         struct file_list *flist = NULL;
 921         int exit_code = 0, exit_code2 = 0;
 922         char *local_name = NULL;
 923
 924         cleanup_child_pid = pid;
 925         if (!read_batch) {
 926                 set_nonblocking(f_in);
 927                 set_nonblocking(f_out);
 928         }
 929
 930         io_set_sock_fds(f_in, f_out);
 931         setup_protocol(f_out,f_in);
 932 #if defined HAVE_ICONV_OPEN && defined HAVE_ICONV_H
 933         setup_iconv();
 934 #endif
 935
 936         if (protocol_version >= 23 && !read_batch)
 937                 io_start_multiplex_in();
 938
 939         /* We set our stderr file handle to blocking because ssh might have
 940          * set it to non-blocking.  This can be particularly troublesome if
 941          * stderr is a clone of stdout, because ssh would have set our stdout
 942          * to non-blocking at the same time (which can easily cause us to lose
 943          * output from our print statements).  This kluge shouldn't cause ssh
 944          * any problems for how we use it.  Note also that we delayed setting
 945          * this until after the above protocol setup so that we know for sure
 946          * that ssh is done twiddling its file descriptors.  */
 947         set_blocking(STDERR_FILENO);
 948
 949         if (am_sender) {
 950                 keep_dirlinks = 0; /* Must be disabled on the sender. */
 951                 io_start_buffering_out();
 952                 if (!filesfrom_host)
 953                         set_msg_fd_in(f_in);
 954                 send_filter_list(f_out);
 955                 if (filesfrom_host)
 956                         filesfrom_fd = f_in;
 957
 958                 if (write_batch && !am_server)
 959                         start_write_batch(f_out);
 960                 flist = send_file_list(f_out, argc, argv);
 961                 set_msg_fd_in(-1);
 962                 if (verbose > 3)
 963                         rprintf(FINFO,"file list sent\n");
 964                 the_file_list = flist;
 965
 966                 io_flush(NORMAL_FLUSH);
 967                 send_files(flist,f_out,f_in);
 968                 io_flush(FULL_FLUSH);
 969                 handle_stats(-1);
 970                 if (protocol_version >= 24)
 971                         read_final_goodbye(f_in, f_out);
 972                 if (pid != -1) {
 973                         if (verbose > 3)
 974                                 rprintf(FINFO,"client_run waiting on %d\n", (int) pid);
 975                         io_flush(FULL_FLUSH);
 976                         wait_process_with_flush(pid, &exit_code);
 977                 }
 978                 output_summary();
 979                 io_flush(FULL_FLUSH);
 980                 exit_cleanup(exit_code);
 981         }
 982
 983         if (need_messages_from_generator && !read_batch)
 984                 io_start_multiplex_out();
 985
 986         if (argc == 0)
 987                 list_only |= 1;
 988
 989         send_filter_list(read_batch ? -1 : f_out);
 990
 991         if (filesfrom_fd >= 0) {
 992                 io_set_filesfrom_fds(filesfrom_fd, f_out);
 993                 filesfrom_fd = -1;
 994         }
 995
 996         if (write_batch && !am_server)
 997                 start_write_batch(f_in);
 998         flist = recv_file_list(f_in);
 999         the_file_list = flist;
1000
1001         if (flist && flist->count > 0) {
1002                 local_name = get_local_name(flist, argv[0]);
1003
1004                 fix_basis_dirs();
1005
1006                 exit_code2 = do_recv(f_in, f_out, flist, local_name);
1007         } else {
1008                 handle_stats(-1);
1009                 output_summary();
1010         }
1011
1012         if (pid != -1) {
1013                 if (verbose > 3)
1014                         rprintf(FINFO,"client_run2 waiting on %d\n", (int) pid);
1015                 io_flush(FULL_FLUSH);
1016                 wait_process_with_flush(pid, &exit_code);
1017         }
1018
1019         return MAX(exit_code, exit_code2);
1020 }
1021
1022 static int copy_argv(char *argv[])
1023 {
1024         int i;
1025
1026         for (i = 0; argv[i]; i++) {
1027                 if (!(argv[i] = strdup(argv[i]))) {
1028                         rprintf (FERROR, "out of memory at %s(%d)\n",
1029                                  __FILE__, __LINE__);
1030                         return RERR_MALLOC;
1031                 }
1032         }
1033
1034         return 0;
1035 }
1036
1037
1038 /**
1039  * Start a client for either type of remote connection.  Work out
1040  * whether the arguments request a remote shell or rsyncd connection,
1041  * and call the appropriate connection function, then run_client.
1042  *
1043  * Calls either start_socket_client (for sockets) or do_cmd and
1044  * client_run (for ssh).
1045  **/
1046 static int start_client(int argc, char *argv[])
1047 {
1048         char *p;
1049         char *shell_machine = NULL;
1050         char *shell_path = NULL;
1051         char *shell_user = NULL;
1052         int ret;
1053         pid_t pid;
1054         int f_in,f_out;
1055         int rc;
1056
1057         /* Don't clobber argv[] so that ps(1) can still show the right
1058          * command line. */
1059         if ((rc = copy_argv(argv)))
1060                 return rc;
1061
1062         if (!read_batch) { /* for read_batch, NO source is specified */
1063                 shell_path = check_for_hostspec(argv[0], &shell_machine, &rsync_port);
1064                 if (shell_path) { /* source is remote */
1065                         char *dummy1;
1066                         int dummy2;
1067                         if (--argc
1068                          && check_for_hostspec(argv[argc], &dummy1, &dummy2)) {
1069                                 rprintf(FERROR,
1070                                         "The source and destination cannot both be remote.\n");
1071                                 exit_cleanup(RERR_SYNTAX);
1072                         }
1073                         argv++;
1074                         if (filesfrom_host && *filesfrom_host
1075                             && strcmp(filesfrom_host, shell_machine) != 0) {
1076                                 rprintf(FERROR,
1077                                         "--files-from hostname is not the same as the transfer hostname\n");
1078                                 exit_cleanup(RERR_SYNTAX);
1079                         }
1080                         if (rsync_port) {
1081                                 if (!shell_cmd) {
1082                                         return start_socket_client(shell_machine,
1083                                                                    shell_path,
1084                                                                    argc, argv);
1085                                 }
1086                                 daemon_over_rsh = 1;
1087                         }
1088
1089                         am_sender = 0;
1090                 } else { /* source is local, check dest arg */
1091                         am_sender = 1;
1092
1093                         if (argc > 1)
1094                                 p = argv[--argc];
1095                         else {
1096                                 p = ".";
1097                                 list_only = 1;
1098                         }
1099
1100                         shell_path = check_for_hostspec(p, &shell_machine, &rsync_port);
1101                         if (shell_path && filesfrom_host && *filesfrom_host
1102                             && strcmp(filesfrom_host, shell_machine) != 0) {
1103                                 rprintf(FERROR,
1104                                         "--files-from hostname is not the same as the transfer hostname\n");
1105                                 exit_cleanup(RERR_SYNTAX);
1106                         }
1107                         if (!shell_path) { /* no hostspec found, so src & dest are local */
1108                                 local_server = 1;
1109                                 if (filesfrom_host) {
1110                                         rprintf(FERROR,
1111                                                 "--files-from cannot be remote when the transfer is local\n");
1112                                         exit_cleanup(RERR_SYNTAX);
1113                                 }
1114                                 shell_machine = NULL;
1115                                 shell_path = p;
1116                         } else if (rsync_port) {
1117                                 if (!shell_cmd) {
1118                                         return start_socket_client(shell_machine,
1119                                                                    shell_path,
1120                                                                    argc, argv);
1121                                 }
1122                                 daemon_over_rsh = 1;
1123                         }
1124                 }
1125         } else {  /* read_batch */
1126                 local_server = 1;
1127                 shell_path = argv[argc-1];
1128                 if (check_for_hostspec(shell_path, &shell_machine, &rsync_port)) {
1129                         rprintf(FERROR, "remote destination is not allowed with --read-batch\n");
1130                         exit_cleanup(RERR_SYNTAX);
1131                 }
1132         }
1133
1134         if (password_file && !daemon_over_rsh) {
1135                 rprintf(FERROR, "The --password-file option is used for "
1136                                 "talking to an rsync daemon.\n");
1137                 exit_cleanup(RERR_SYNTAX);
1138         }
1139
1140         if (shell_machine) {
1141                 p = strrchr(shell_machine,'@');
1142                 if (p) {
1143                         *p = 0;
1144                         shell_user = shell_machine;
1145                         shell_machine = p+1;
1146                 }
1147         }
1148
1149         if (verbose > 3) {
1150                 rprintf(FINFO,"cmd=%s machine=%s user=%s path=%s\n",
1151                         shell_cmd ? shell_cmd : "",
1152                         shell_machine ? shell_machine : "",
1153                         shell_user ? shell_user : "",
1154                         shell_path ? shell_path : "");
1155         }
1156
1157         /* for remote source, only single dest arg can remain ... */
1158         if (!am_sender && argc > 1) {
1159                 usage(FERROR);
1160                 exit_cleanup(RERR_SYNTAX);
1161         }
1162
1163         /* ... or no dest at all */
1164         if (!am_sender && argc == 0)
1165                 list_only |= 1;
1166
1167         pid = do_cmd(shell_cmd,shell_machine,shell_user,shell_path,
1168                      &f_in,&f_out);
1169
1170         /* if we're running an rsync server on the remote host over a
1171          * remote shell command, we need to do the RSYNCD protocol first */
1172         if (daemon_over_rsh) {
1173                 int tmpret;
1174                 tmpret = start_inband_exchange(shell_user, shell_path,
1175                                                f_in, f_out, argc);
1176                 if (tmpret < 0)
1177                         return tmpret;
1178         }
1179
1180         ret = client_run(f_in, f_out, pid, argc, argv);
1181
1182         fflush(stdout);
1183         fflush(stderr);
1184
1185         return ret;
1186 }
1187
1188
1189 static RETSIGTYPE sigusr1_handler(UNUSED(int val))
1190 {
1191         exit_cleanup(RERR_SIGNAL1);
1192 }
1193
1194 static RETSIGTYPE sigusr2_handler(UNUSED(int val))
1195 {
1196         if (!am_server)
1197                 output_summary();
1198         close_all();
1199         if (log_got_error)
1200                 _exit(RERR_PARTIAL);
1201         _exit(0);
1202 }
1203
1204 RETSIGTYPE remember_children(UNUSED(int val))
1205 {
1206 #ifdef WNOHANG
1207         int cnt, status;
1208         pid_t pid;
1209         /* An empty waitpid() loop was put here by Tridge and we could never
1210          * get him to explain why he put it in, so rather than taking it
1211          * out we're instead saving the child exit statuses for later use.
1212          * The waitpid() loop presumably eliminates all possibility of leaving
1213          * zombie children, maybe that's why he did it. */
1214         while ((pid = waitpid(-1, &status, WNOHANG)) > 0) {
1215                 /* save the child's exit status */
1216                 for (cnt = 0; cnt < MAXCHILDPROCS; cnt++) {
1217                         if (pid_stat_table[cnt].pid == 0) {
1218                                 pid_stat_table[cnt].pid = pid;
1219                                 pid_stat_table[cnt].status = status;
1220                                 break;
1221                         }
1222                 }
1223         }
1224 #endif
1225 #ifndef HAVE_SIGACTION
1226         signal(SIGCHLD, remember_children);
1227 #endif
1228 }
1229
1230
1231 /**
1232  * This routine catches signals and tries to send them to gdb.
1233  *
1234  * Because it's called from inside a signal handler it ought not to
1235  * use too many library routines.
1236  *
1237  * @todo Perhaps use "screen -X" instead/as well, to help people
1238  * debugging without easy access to X.  Perhaps use an environment
1239  * variable, or just call a script?
1240  *
1241  * @todo The /proc/ magic probably only works on Linux (and
1242  * Solaris?)  Can we be more portable?
1243  **/
1244 #ifdef MAINTAINER_MODE
1245 const char *get_panic_action(void)
1246 {
1247         const char *cmd_fmt = getenv("RSYNC_PANIC_ACTION");
1248
1249         if (cmd_fmt)
1250                 return cmd_fmt;
1251         else
1252                 return "xterm -display :0 -T Panic -n Panic "
1253                         "-e gdb /proc/%d/exe %d";
1254 }
1255
1256
1257 /**
1258  * Handle a fatal signal by launching a debugger, controlled by $RSYNC_PANIC_ACTION.
1259  *
1260  * This signal handler is only installed if we were configured with
1261  * --enable-maintainer-mode.  Perhaps it should always be on and we
1262  * should just look at the environment variable, but I'm a bit leery
1263  * of a signal sending us into a busy loop.
1264  **/
1265 static RETSIGTYPE rsync_panic_handler(UNUSED(int whatsig))
1266 {
1267         char cmd_buf[300];
1268         int ret;
1269
1270         snprintf(cmd_buf, sizeof cmd_buf, get_panic_action(),
1271                  getpid(), getpid());
1272
1273         /* Unless we failed to execute gdb, we allow the process to
1274          * continue.  I'm not sure if that's right. */
1275         ret = system(cmd_buf);
1276         if (ret)
1277                 _exit(ret);
1278 }
1279 #endif
1280
1281
1282 int main(int argc,char *argv[])
1283 {
1284         int ret;
1285         int orig_argc = argc;
1286         char **orig_argv = argv;
1287 #ifdef HAVE_SIGACTION
1288 # ifdef HAVE_SIGPROCMASK
1289         sigset_t sigmask;
1290
1291         sigemptyset(&sigmask);
1292 # endif
1293         sigact.sa_flags = SA_NOCLDSTOP;
1294 #endif
1295         SIGACTMASK(SIGUSR1, sigusr1_handler);
1296         SIGACTMASK(SIGUSR2, sigusr2_handler);
1297         SIGACTMASK(SIGCHLD, remember_children);
1298 #ifdef MAINTAINER_MODE
1299         SIGACTMASK(SIGSEGV, rsync_panic_handler);
1300         SIGACTMASK(SIGFPE, rsync_panic_handler);
1301         SIGACTMASK(SIGABRT, rsync_panic_handler);
1302         SIGACTMASK(SIGBUS, rsync_panic_handler);
1303 #endif
1304
1305         starttime = time(NULL);
1306         am_root = (MY_UID() == 0);
1307
1308         memset(&stats, 0, sizeof(stats));
1309
1310         if (argc < 2) {
1311                 usage(FERROR);
1312                 exit_cleanup(RERR_SYNTAX);
1313         }
1314
1315         /* we set a 0 umask so that correct file permissions can be
1316          * carried across */
1317         orig_umask = umask(0);
1318
1319 #if defined CONFIG_LOCALE && defined HAVE_SETLOCALE
1320         setlocale(LC_CTYPE, "");
1321 #endif
1322
1323         if (!parse_arguments(&argc, (const char ***) &argv, 1)) {
1324                 /* FIXME: We ought to call the same error-handling
1325                  * code here, rather than relying on getopt. */
1326                 option_error();
1327                 exit_cleanup(RERR_SYNTAX);
1328         }
1329
1330         SIGACTMASK(SIGINT, sig_int);
1331         SIGACTMASK(SIGHUP, sig_int);
1332         SIGACTMASK(SIGTERM, sig_int);
1333 #if defined HAVE_SIGACTION && HAVE_SIGPROCMASK
1334         sigprocmask(SIG_UNBLOCK, &sigmask, NULL);
1335 #endif
1336
1337         /* Ignore SIGPIPE; we consistently check error codes and will
1338          * see the EPIPE. */
1339         SIGACTION(SIGPIPE, SIG_IGN);
1340 #ifdef SIGXFSZ
1341         SIGACTION(SIGXFSZ, SIG_IGN);
1342 #endif
1343
1344         /* Initialize push_dir here because on some old systems getcwd
1345          * (implemented by forking "pwd" and reading its output) doesn't
1346          * work when there are other child processes.  Also, on all systems
1347          * that implement getcwd that way "pwd" can't be found after chroot. */
1348         push_dir(NULL, 0);
1349
1350         init_flist();
1351
1352         if ((write_batch || read_batch) && !am_server) {
1353                 if (write_batch)
1354                         write_batch_shell_file(orig_argc, orig_argv, argc);
1355
1356                 if (read_batch && strcmp(batch_name, "-") == 0)
1357                         batch_fd = STDIN_FILENO;
1358                 else {
1359                         batch_fd = do_open(batch_name,
1360                                    write_batch ? O_WRONLY | O_CREAT | O_TRUNC
1361                                    : O_RDONLY, S_IRUSR | S_IWUSR);
1362                 }
1363                 if (batch_fd < 0) {
1364                         rsyserr(FERROR, errno, "Batch file %s open error",
1365                                 full_fname(batch_name));
1366                         exit_cleanup(RERR_FILEIO);
1367                 }
1368                 if (read_batch)
1369                         read_stream_flags(batch_fd);
1370                 else
1371                         write_stream_flags(batch_fd);
1372
1373         }
1374         if (write_batch < 0)
1375                 dry_run = 1;
1376
1377         if (am_daemon && !am_server)
1378                 return daemon_main();
1379
1380         if (argc < 1) {
1381                 usage(FERROR);
1382                 exit_cleanup(RERR_SYNTAX);
1383         }
1384
1385         if (am_server) {
1386                 set_nonblocking(STDIN_FILENO);
1387                 set_nonblocking(STDOUT_FILENO);
1388                 if (am_daemon)
1389                         return start_daemon(STDIN_FILENO, STDOUT_FILENO);
1390                 start_server(STDIN_FILENO, STDOUT_FILENO, argc, argv);
1391         }
1392
1393         ret = start_client(argc, argv);
1394         if (ret == -1)
1395                 exit_cleanup(RERR_STARTCLIENT);
1396         else
1397                 exit_cleanup(ret);
1398
1399         return ret;
1400 }