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