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 incremental;
  38 extern int blocking_io;
  39 extern int remove_source_files;
  40 extern int daemon_over_rsh;
  41 extern int need_messages_from_generator;
  42 extern int kluge_around_eof;
  43 extern int do_stats;
  44 extern int log_got_error;
  45 extern int module_id;
  46 extern int copy_links;
  47 extern int copy_dirlinks;
  48 extern int keep_dirlinks;
  49 extern int preserve_hard_links;
  50 extern int protocol_version;
  51 extern int file_total;
  52 extern int recurse;
  53 extern int relative_paths;
  54 extern int sanitize_paths;
  55 extern int curr_dir_depth;
  56 extern int curr_dir_len;
  57 extern int module_id;
  58 extern int rsync_port;
  59 extern int whole_file;
  60 extern int read_batch;
  61 extern int write_batch;
  62 extern int batch_fd;
  63 extern int filesfrom_fd;
  64 extern pid_t cleanup_child_pid;
  65 extern struct stats stats;
  66 extern char *filesfrom_host;
  67 extern char *partial_dir;
  68 extern char *basis_dir[];
  69 extern char *rsync_path;
  70 extern char *shell_cmd;
  71 extern char *batch_name;
  72 extern char *password_file;
  73 extern char curr_dir[MAXPATHLEN];
  74 extern struct filter_list_struct server_filter_list;
  75
  76 int local_server = 0;
  77 int new_root_dir = 0;
  78 mode_t orig_umask = 0;
  79 int batch_gen_fd = -1;
  80
  81 /* There's probably never more than at most 2 outstanding child processes,
  82  * but set it higher, just in case. */
  83 #define MAXCHILDPROCS 7
  84
  85 #ifdef HAVE_SIGACTION
  86 # ifdef HAVE_SIGPROCMASK
  87 #  define SIGACTMASK(n,h) SIGACTION(n,h), sigaddset(&sigmask,(n))
  88 # else
  89 #  define SIGACTMASK(n,h) SIGACTION(n,h)
  90 # endif
  91 static struct sigaction sigact;
  92 #endif
  93
  94 struct pid_status {
  95         pid_t pid;
  96         int status;
  97 } pid_stat_table[MAXCHILDPROCS];
  98
  99 static time_t starttime, endtime;
 100 static int64 total_read, total_written;
 101
 102 static void show_malloc_stats(void);
 103
 104 /* Works like waitpid(), but if we already harvested the child pid in our
 105  * remember_children(), we succeed instead of returning an error. */
 106 pid_t wait_process(pid_t pid, int *status_ptr, int flags)
 107 {
 108         pid_t waited_pid;
 109
 110         do {
 111                 waited_pid = waitpid(pid, status_ptr, flags);
 112         } while (waited_pid == -1 && errno == EINTR);
 113
 114         if (waited_pid == -1 && errno == ECHILD) {
 115                 /* Status of requested child no longer available:  check to
 116                  * see if it was processed by remember_children(). */
 117                 int cnt;
 118                 for (cnt = 0; cnt < MAXCHILDPROCS; cnt++) {
 119                         if (pid == pid_stat_table[cnt].pid) {
 120                                 *status_ptr = pid_stat_table[cnt].status;
 121                                 pid_stat_table[cnt].pid = 0;
 122                                 return pid;
 123                         }
 124                 }
 125         }
 126
 127         return waited_pid;
 128 }
 129
 130 /* Wait for a process to exit, calling io_flush while waiting. */
 131 static void wait_process_with_flush(pid_t pid, int *exit_code_ptr)
 132 {
 133         pid_t waited_pid;
 134         int status;
 135
 136         while ((waited_pid = wait_process(pid, &status, WNOHANG)) == 0) {
 137                 msleep(20);
 138                 io_flush(FULL_FLUSH);
 139         }
 140
 141         /* TODO: If the child exited on a signal, then log an
 142          * appropriate error message.  Perhaps we should also accept a
 143          * message describing the purpose of the child.  Also indicate
 144          * this to the caller so that they know something went wrong. */
 145         if (waited_pid < 0) {
 146                 rsyserr(FERROR, errno, "waitpid");
 147                 *exit_code_ptr = RERR_WAITCHILD;
 148         } else if (!WIFEXITED(status)) {
 149 #ifdef WCOREDUMP
 150                 if (WCOREDUMP(status))
 151                         *exit_code_ptr = RERR_CRASHED;
 152                 else
 153 #endif
 154                 if (WIFSIGNALED(status))
 155                         *exit_code_ptr = RERR_TERMINATED;
 156                 else
 157                         *exit_code_ptr = RERR_WAITCHILD;
 158         } else
 159                 *exit_code_ptr = WEXITSTATUS(status);
 160 }
 161
 162 /* This function gets called from all 3 processes.  We want the client side
 163  * to actually output the text, but the sender is the only process that has
 164  * all the stats we need.  So, if we're a client sender, we do the report.
 165  * If we're a server sender, we write the stats on the supplied fd.  If
 166  * we're the client receiver we read the stats from the supplied fd and do
 167  * the report.  All processes might also generate a set of debug stats, if
 168  * the verbose level is high enough (this is the only thing that the
 169  * generator process and the server receiver ever do here). */
 170 static void handle_stats(int f)
 171 {
 172         endtime = time(NULL);
 173
 174         /* Cache two stats because the read/write code can change it. */
 175         total_read = stats.total_read;
 176         total_written = stats.total_written;
 177
 178         if (do_stats && verbose > 1) {
 179                 /* These come out from every process */
 180                 show_malloc_stats();
 181                 show_flist_stats();
 182         }
 183
 184         if (am_generator)
 185                 return;
 186
 187         if (am_daemon) {
 188                 if (f == -1 || !am_sender)
 189                         return;
 190         }
 191
 192         if (am_server) {
 193                 if (am_sender) {
 194                         write_longint(f, total_read);
 195                         write_longint(f, total_written);
 196                         write_longint(f, stats.total_size);
 197                         if (protocol_version >= 29) {
 198                                 write_longint(f, stats.flist_buildtime);
 199                                 write_longint(f, stats.flist_xfertime);
 200                         }
 201                 }
 202                 return;
 203         }
 204
 205         /* this is the client */
 206
 207         if (f < 0 && !am_sender) /* e.g. when we got an empty file list. */
 208                 ;
 209         else if (!am_sender) {
 210                 /* Read the first two in opposite order because the meaning of
 211                  * read/write swaps when switching from sender to receiver. */
 212                 total_written = read_longint(f);
 213                 total_read = read_longint(f);
 214                 stats.total_size = read_longint(f);
 215                 if (protocol_version >= 29) {
 216                         stats.flist_buildtime = read_longint(f);
 217                         stats.flist_xfertime = read_longint(f);
 218                 }
 219         } else if (write_batch) {
 220                 /* The --read-batch process is going to be a client
 221                  * receiver, so we need to give it the stats. */
 222                 write_longint(batch_fd, total_read);
 223                 write_longint(batch_fd, total_written);
 224                 write_longint(batch_fd, stats.total_size);
 225                 if (protocol_version >= 29) {
 226                         write_longint(batch_fd, stats.flist_buildtime);
 227                         write_longint(batch_fd, stats.flist_xfertime);
 228                 }
 229         }
 230 }
 231
 232 static void output_summary(void)
 233 {
 234         if (do_stats) {
 235                 rprintf(FCLIENT, "\n");
 236                 rprintf(FINFO,"Number of files: %d\n", stats.num_files);
 237                 rprintf(FINFO,"Number of files transferred: %d\n",
 238                         stats.num_transferred_files);
 239                 rprintf(FINFO,"Total file size: %s bytes\n",
 240                         human_num(stats.total_size));
 241                 rprintf(FINFO,"Total transferred file size: %s bytes\n",
 242                         human_num(stats.total_transferred_size));
 243                 rprintf(FINFO,"Literal data: %s bytes\n",
 244                         human_num(stats.literal_data));
 245                 rprintf(FINFO,"Matched data: %s bytes\n",
 246                         human_num(stats.matched_data));
 247                 rprintf(FINFO,"File list size: %s\n",
 248                         human_num(stats.flist_size));
 249                 if (stats.flist_buildtime) {
 250                         rprintf(FINFO,
 251                                 "File list generation time: %.3f seconds\n",
 252                                 (double)stats.flist_buildtime / 1000);
 253                         rprintf(FINFO,
 254                                 "File list transfer time: %.3f seconds\n",
 255                                 (double)stats.flist_xfertime / 1000);
 256                 }
 257                 rprintf(FINFO,"Total bytes sent: %s\n",
 258                         human_num(total_written));
 259                 rprintf(FINFO,"Total bytes received: %s\n",
 260                         human_num(total_read));
 261         }
 262
 263         if (verbose || do_stats) {
 264                 rprintf(FCLIENT, "\n");
 265                 rprintf(FINFO,
 266                         "sent %s bytes  received %s bytes  %s bytes/sec\n",
 267                         human_num(total_written), human_num(total_read),
 268                         human_dnum((total_written + total_read)/(0.5 + (endtime - starttime)), 2));
 269                 rprintf(FINFO, "total size is %s  speedup is %.2f\n",
 270                         human_num(stats.total_size),
 271                         (double)stats.total_size / (total_written+total_read));
 272         }
 273
 274         fflush(stdout);
 275         fflush(stderr);
 276 }
 277
 278
 279 /**
 280  * If our C library can get malloc statistics, then show them to FINFO
 281  **/
 282 static void show_malloc_stats(void)
 283 {
 284 #ifdef HAVE_MALLINFO
 285         struct mallinfo mi;
 286
 287         mi = mallinfo();
 288
 289         rprintf(FCLIENT, "\n");
 290         rprintf(FINFO, RSYNC_NAME "[%d] (%s%s%s) heap statistics:\n",
 291                 getpid(), am_server ? "server " : "",
 292                 am_daemon ? "daemon " : "", who_am_i());
 293         rprintf(FINFO, "  arena:     %10ld   (bytes from sbrk)\n",
 294                 (long)mi.arena);
 295         rprintf(FINFO, "  ordblks:   %10ld   (chunks not in use)\n",
 296                 (long)mi.ordblks);
 297         rprintf(FINFO, "  smblks:    %10ld\n",
 298                 (long)mi.smblks);
 299         rprintf(FINFO, "  hblks:     %10ld   (chunks from mmap)\n",
 300                 (long)mi.hblks);
 301         rprintf(FINFO, "  hblkhd:    %10ld   (bytes from mmap)\n",
 302                 (long)mi.hblkhd);
 303         rprintf(FINFO, "  allmem:    %10ld   (bytes from sbrk + mmap)\n",
 304                 (long)mi.arena + mi.hblkhd);
 305         rprintf(FINFO, "  usmblks:   %10ld\n",
 306                 (long)mi.usmblks);
 307         rprintf(FINFO, "  fsmblks:   %10ld\n",
 308                 (long)mi.fsmblks);
 309         rprintf(FINFO, "  uordblks:  %10ld   (bytes used)\n",
 310                 (long)mi.uordblks);
 311         rprintf(FINFO, "  fordblks:  %10ld   (bytes free)\n",
 312                 (long)mi.fordblks);
 313         rprintf(FINFO, "  keepcost:  %10ld   (bytes in releasable chunk)\n",
 314                 (long)mi.keepcost);
 315 #endif /* HAVE_MALLINFO */
 316 }
 317
 318
 319 /* Start the remote shell.   cmd may be NULL to use the default. */
 320 static pid_t do_cmd(char *cmd, char *machine, char *user, char *path,
 321                     int *f_in, int *f_out)
 322 {
 323         int i, argc = 0;
 324         char *args[MAX_ARGS];
 325         pid_t ret;
 326         char *dir = NULL;
 327         int dash_l_set = 0;
 328
 329         if (!read_batch && !local_server) {
 330                 char *t, *f, in_quote = '\0';
 331                 char *rsh_env = getenv(RSYNC_RSH_ENV);
 332                 if (!cmd)
 333                         cmd = rsh_env;
 334                 if (!cmd)
 335                         cmd = RSYNC_RSH;
 336                 cmd = strdup(cmd);
 337                 if (!cmd)
 338                         goto oom;
 339
 340                 for (t = f = cmd; *f; f++) {
 341                         if (*f == ' ')
 342                                 continue;
 343                         /* Comparison leaves rooms for server_options(). */
 344                         if (argc >= MAX_ARGS - MAX_SERVER_ARGS) {
 345                                 rprintf(FERROR, "internal: args[] overflowed in do_cmd()\n");
 346                                 exit_cleanup(RERR_SYNTAX);
 347                         }
 348                         args[argc++] = t;
 349                         while (*f != ' ' || in_quote) {
 350                                 if (!*f) {
 351                                         if (in_quote) {
 352                                                 rprintf(FERROR,
 353                                                     "Missing trailing-%c in remote-shell command.\n",
 354                                                     in_quote);
 355                                                 exit_cleanup(RERR_SYNTAX);
 356                                         }
 357                                         f--;
 358                                         break;
 359                                 }
 360                                 if (*f == '\'' || *f == '"') {
 361                                         if (!in_quote) {
 362                                                 in_quote = *f++;
 363                                                 continue;
 364                                         }
 365                                         if (*f == in_quote && *++f != in_quote) {
 366                                                 in_quote = '\0';
 367                                                 continue;
 368                                         }
 369                                 }
 370                                 *t++ = *f++;
 371                         }
 372                         *t++ = '\0';
 373                 }
 374
 375                 /* check to see if we've already been given '-l user' in
 376                  * the remote-shell command */
 377                 for (i = 0; i < argc-1; i++) {
 378                         if (!strcmp(args[i], "-l") && args[i+1][0] != '-')
 379                                 dash_l_set = 1;
 380                 }
 381
 382 #ifdef HAVE_REMSH
 383                 /* remsh (on HPUX) takes the arguments the other way around */
 384                 args[argc++] = machine;
 385                 if (user && !(daemon_over_rsh && dash_l_set)) {
 386                         args[argc++] = "-l";
 387                         args[argc++] = user;
 388                 }
 389 #else
 390                 if (user && !(daemon_over_rsh && dash_l_set)) {
 391                         args[argc++] = "-l";
 392                         args[argc++] = user;
 393                 }
 394                 args[argc++] = machine;
 395 #endif
 396
 397                 args[argc++] = rsync_path;
 398
 399                 if (blocking_io < 0) {
 400                         char *cp;
 401                         if ((cp = strrchr(cmd, '/')) != NULL)
 402                                 cp++;
 403                         else
 404                                 cp = cmd;
 405                         if (strcmp(cp, "rsh") == 0 || strcmp(cp, "remsh") == 0)
 406                                 blocking_io = 1;
 407                 }
 408
 409                 server_options(args,&argc);
 410
 411                 if (argc >= MAX_ARGS - 2) {
 412                         rprintf(FERROR, "internal: args[] overflowed in do_cmd()\n");
 413                         exit_cleanup(RERR_SYNTAX);
 414                 }
 415         }
 416
 417         args[argc++] = ".";
 418
 419         if (!daemon_over_rsh && path && *path)
 420                 args[argc++] = path;
 421
 422         args[argc] = NULL;
 423
 424         if (verbose > 3) {
 425                 for (i = 0; i < argc; i++)
 426                         rprintf(FCLIENT, "cmd[%d]=%s ", i, args[i]);
 427                 rprintf(FCLIENT, "\n");
 428         }
 429
 430         if (read_batch) {
 431                 int from_gen_pipe[2];
 432                 if (fd_pair(from_gen_pipe) < 0) {
 433                         rsyserr(FERROR, errno, "pipe");
 434                         exit_cleanup(RERR_IPC);
 435                 }
 436                 batch_gen_fd = from_gen_pipe[0];
 437                 *f_out = from_gen_pipe[1];
 438                 *f_in = batch_fd;
 439                 ret = -1; /* no child pid */
 440         } else if (local_server) {
 441                 /* If the user didn't request --[no-]whole-file, force
 442                  * it on, but only if we're not batch processing. */
 443                 if (whole_file < 0 && !write_batch)
 444                         whole_file = 1;
 445                 ret = local_child(argc, args, f_in, f_out, child_main);
 446         } else
 447                 ret = piped_child(args,f_in,f_out);
 448
 449         if (dir)
 450                 free(dir);
 451
 452         return ret;
 453
 454   oom:
 455         out_of_memory("do_cmd");
 456         return 0; /* not reached */
 457 }
 458
 459 /* The receiving side operates in one of two modes:
 460  *
 461  * 1. it receives any number of files into a destination directory,
 462  * placing them according to their names in the file-list.
 463  *
 464  * 2. it receives a single file and saves it using the name in the
 465  * destination path instead of its file-list name.  This requires a
 466  * "local name" for writing out the destination file.
 467  *
 468  * So, our task is to figure out what mode/local-name we need.
 469  * For mode 1, we change into the destination directory and return NULL.
 470  * For mode 2, we change into the directory containing the destination
 471  * file (if we aren't already there) and return the local-name. */
 472 static char *get_local_name(struct file_list *flist, char *dest_path)
 473 {
 474         STRUCT_STAT st;
 475         int statret;
 476         char *cp;
 477
 478         if (verbose > 2) {
 479                 rprintf(FINFO, "get_local_name count=%d %s\n",
 480                         file_total, NS(dest_path));
 481         }
 482
 483         if (!dest_path || list_only)
 484                 return NULL;
 485
 486         /* See what currently exists at the destination. */
 487         if ((statret = do_stat(dest_path, &st)) == 0) {
 488                 /* If the destination is a dir, enter it and use mode 1. */
 489                 if (S_ISDIR(st.st_mode)) {
 490                         if (!push_dir(dest_path, 0)) {
 491                                 rsyserr(FERROR, errno, "push_dir#1 %s failed",
 492                                         full_fname(dest_path));
 493                                 exit_cleanup(RERR_FILESELECT);
 494                         }
 495                         return NULL;
 496                 }
 497                 if (file_total > 1) {
 498                         rprintf(FERROR,
 499                                 "ERROR: destination must be a directory when"
 500                                 " copying more than 1 file\n");
 501                         exit_cleanup(RERR_FILESELECT);
 502                 }
 503                 if (file_total == 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 (file_total > 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, iflags, xlen;
 615         uchar fnamecmp_type;
 616         char xname[MAXPATHLEN];
 617
 618         if (protocol_version < 29)
 619                 i = read_int(f_in);
 620         else {
 621                 i = read_ndx_and_attrs(f_in, f_out, &iflags,
 622                                        &fnamecmp_type, xname, &xlen);
 623         }
 624
 625         if (i != NDX_DONE) {
 626                 rprintf(FERROR, "Invalid packet at end of run (%d) [%s]\n",
 627                         i, who_am_i());
 628                 exit_cleanup(RERR_PROTOCOL);
 629         }
 630 }
 631
 632 static void do_server_sender(int f_in, int f_out, int argc, char *argv[])
 633 {
 634         struct file_list *flist;
 635         char *dir = argv[0];
 636
 637         if (verbose > 2) {
 638                 rprintf(FINFO, "server_sender starting pid=%ld\n",
 639                         (long)getpid());
 640         }
 641
 642         if (am_daemon && lp_write_only(module_id)) {
 643                 rprintf(FERROR, "ERROR: module is write only\n");
 644                 exit_cleanup(RERR_SYNTAX);
 645                 return;
 646         }
 647         if (am_daemon && lp_read_only(module_id) && remove_source_files) {
 648                 rprintf(FERROR,
 649                     "ERROR: --remove-%s-files cannot be used with a read-only module\n",
 650                     remove_source_files == 1 ? "source" : "sent");
 651                 exit_cleanup(RERR_SYNTAX);
 652                 return;
 653         }
 654
 655         if (!relative_paths) {
 656                 if (!push_dir(dir, 0)) {
 657                         rsyserr(FERROR, errno, "push_dir#3 %s failed",
 658                                 full_fname(dir));
 659                         exit_cleanup(RERR_FILESELECT);
 660                 }
 661         }
 662         argc--;
 663         argv++;
 664
 665         if (argc == 0 && (recurse || list_only)) {
 666                 argc = 1;
 667                 argv--;
 668                 argv[0] = ".";
 669         }
 670
 671         flist = send_file_list(f_out,argc,argv);
 672         if (!flist || flist->count == 0)
 673                 exit_cleanup(0);
 674
 675         io_start_buffering_in(f_in);
 676
 677         send_files(f_in, f_out);
 678         io_flush(FULL_FLUSH);
 679         handle_stats(f_out);
 680         if (protocol_version >= 24)
 681                 read_final_goodbye(f_in, f_out);
 682         io_flush(FULL_FLUSH);
 683         exit_cleanup(0);
 684 }
 685
 686
 687 static int do_recv(int f_in, int f_out, char *local_name)
 688 {
 689         int pid;
 690         int exit_code = 0;
 691         int error_pipe[2];
 692
 693         /* The receiving side mustn't obey this, or an existing symlink that
 694          * points to an identical file won't be replaced by the referent. */
 695         copy_links = copy_dirlinks = 0;
 696
 697 #ifdef SUPPORT_HARD_LINKS
 698         if (preserve_hard_links)
 699                 match_hard_links();
 700 #endif
 701
 702         if (fd_pair(error_pipe) < 0) {
 703                 rsyserr(FERROR, errno, "pipe failed in do_recv");
 704                 exit_cleanup(RERR_IPC);
 705         }
 706
 707         io_flush(NORMAL_FLUSH);
 708
 709         if ((pid = do_fork()) == -1) {
 710                 rsyserr(FERROR, errno, "fork failed in do_recv");
 711                 exit_cleanup(RERR_IPC);
 712         }
 713
 714         if (pid == 0) {
 715                 close(error_pipe[0]);
 716                 if (f_in != f_out)
 717                         close(f_out);
 718
 719                 /* we can't let two processes write to the socket at one time */
 720                 io_end_multiplex_out();
 721
 722                 /* set place to send errors */
 723                 set_msg_fd_out(error_pipe[1]);
 724                 io_start_buffering_out(error_pipe[1]);
 725
 726                 recv_files(f_in, local_name);
 727                 io_flush(FULL_FLUSH);
 728                 handle_stats(f_in);
 729
 730                 send_msg(MSG_DONE, "", 0);
 731                 io_flush(FULL_FLUSH);
 732
 733                 /* Handle any keep-alive packets from the post-processing work
 734                  * that the generator does. */
 735                 if (protocol_version >= 29) {
 736                         int iflags, xlen;
 737                         uchar fnamecmp_type;
 738                         char xname[MAXPATHLEN];
 739
 740                         kluge_around_eof = -1;
 741
 742                         /* This should only get stopped via a USR2 signal. */
 743                         read_ndx_and_attrs(f_in, -1, &iflags, &fnamecmp_type,
 744                                            xname, &xlen);
 745
 746                         rprintf(FERROR, "Invalid packet at end of run [%s]\n",
 747                                 who_am_i());
 748                         exit_cleanup(RERR_PROTOCOL);
 749                 }
 750
 751                 /* Finally, we go to sleep until our parent kills us with a
 752                  * USR2 signal.  We sleep for a short time, as on some OSes
 753                  * a signal won't interrupt a sleep! */
 754                 while (1)
 755                         msleep(20);
 756         }
 757
 758         am_generator = 1;
 759
 760         io_end_multiplex_in();
 761         if (write_batch && !am_server)
 762                 stop_write_batch();
 763
 764         close(error_pipe[1]);
 765         if (f_in != f_out)
 766                 close(f_in);
 767
 768         io_start_buffering_out(f_out);
 769
 770         set_msg_fd_in(error_pipe[0]);
 771         io_start_buffering_in(error_pipe[0]);
 772
 773         generate_files(f_out, local_name);
 774
 775         handle_stats(-1);
 776         io_flush(FULL_FLUSH);
 777         if (protocol_version >= 24) {
 778                 /* send a final goodbye message */
 779                 write_ndx(f_out, NDX_DONE);
 780         }
 781         io_flush(FULL_FLUSH);
 782
 783         set_msg_fd_in(-1);
 784         kill(pid, SIGUSR2);
 785         wait_process_with_flush(pid, &exit_code);
 786         return exit_code;
 787 }
 788
 789 static void do_server_recv(int f_in, int f_out, int argc, char *argv[])
 790 {
 791         int exit_code;
 792         struct file_list *flist;
 793         char *local_name = NULL;
 794         char *dir = NULL;
 795         int save_verbose = verbose;
 796
 797         if (filesfrom_fd >= 0) {
 798                 /* We can't mix messages with files-from data on the socket,
 799                  * so temporarily turn off verbose messages. */
 800                 verbose = 0;
 801         }
 802
 803         if (verbose > 2) {
 804                 rprintf(FINFO, "server_recv(%d) starting pid=%ld\n",
 805                         argc, (long)getpid());
 806         }
 807
 808         if (am_daemon && lp_read_only(module_id)) {
 809                 rprintf(FERROR,"ERROR: module is read only\n");
 810                 exit_cleanup(RERR_SYNTAX);
 811                 return;
 812         }
 813
 814         if (argc > 0) {
 815                 dir = argv[0];
 816                 argc--;
 817                 argv++;
 818                 if (!am_daemon && !push_dir(dir, 0)) {
 819                         rsyserr(FERROR, errno, "push_dir#4 %s failed",
 820                                 full_fname(dir));
 821                         exit_cleanup(RERR_FILESELECT);
 822                 }
 823         }
 824
 825         if (protocol_version >= 30)
 826                 io_start_multiplex_in();
 827         else
 828                 io_start_buffering_in(f_in);
 829         recv_filter_list(f_in);
 830
 831         if (filesfrom_fd >= 0) {
 832                 /* We need to send the files-from names to the sender at the
 833                  * same time that we receive the file-list from them, so we
 834                  * need the IO routines to automatically write out the names
 835                  * onto our f_out socket as we read the file-list.  This
 836                  * avoids both deadlock and extra delays/buffers. */
 837                 io_set_filesfrom_fds(filesfrom_fd, f_out);
 838                 filesfrom_fd = -1;
 839         }
 840
 841         flist = recv_file_list(f_in);
 842         if (!flist) {
 843                 rprintf(FERROR,"server_recv: recv_file_list error\n");
 844                 exit_cleanup(RERR_FILESELECT);
 845         }
 846         if (incremental && file_total == 1)
 847                 recv_additional_file_list(f_in);
 848         verbose = save_verbose;
 849
 850         if (argc > 0)
 851                 local_name = get_local_name(flist,argv[0]);
 852
 853         /* Now that we know what our destination directory turned out to be,
 854          * we can sanitize the --link-/copy-/compare-dest args correctly. */
 855         if (sanitize_paths) {
 856                 char **dir;
 857                 for (dir = basis_dir; *dir; dir++) {
 858                         *dir = sanitize_path(NULL, *dir, NULL, curr_dir_depth, NULL);
 859                 }
 860                 if (partial_dir) {
 861                         partial_dir = sanitize_path(NULL, partial_dir, NULL, curr_dir_depth, NULL);
 862                 }
 863         }
 864         fix_basis_dirs();
 865
 866         if (server_filter_list.head) {
 867                 char **dir;
 868                 struct filter_list_struct *elp = &server_filter_list;
 869
 870                 for (dir = basis_dir; *dir; dir++) {
 871                         if (check_filter(elp, *dir, 1) < 0)
 872                                 goto options_rejected;
 873                 }
 874                 if (partial_dir && *partial_dir == '/'
 875                  && check_filter(elp, partial_dir, 1) < 0) {
 876                     options_rejected:
 877                         rprintf(FERROR,
 878                                 "Your options have been rejected by the server.\n");
 879                         exit_cleanup(RERR_SYNTAX);
 880                 }
 881         }
 882
 883         exit_code = do_recv(f_in, f_out, local_name);
 884         exit_cleanup(exit_code);
 885 }
 886
 887
 888 int child_main(int argc, char *argv[])
 889 {
 890         start_server(STDIN_FILENO, STDOUT_FILENO, argc, argv);
 891         return 0;
 892 }
 893
 894
 895 void start_server(int f_in, int f_out, int argc, char *argv[])
 896 {
 897         set_nonblocking(f_in);
 898         set_nonblocking(f_out);
 899
 900         io_set_sock_fds(f_in, f_out);
 901         setup_protocol(f_out, f_in);
 902 #if defined HAVE_ICONV_OPEN && defined HAVE_ICONV_H
 903         setup_iconv();
 904 #endif
 905
 906         if (protocol_version >= 23)
 907                 io_start_multiplex_out();
 908
 909         if (am_sender) {
 910                 keep_dirlinks = 0; /* Must be disabled on the sender. */
 911                 if (need_messages_from_generator)
 912                         io_start_multiplex_in();
 913                 recv_filter_list(f_in);
 914                 do_server_sender(f_in, f_out, argc, argv);
 915         } else
 916                 do_server_recv(f_in, f_out, argc, argv);
 917         exit_cleanup(0);
 918 }
 919
 920
 921 /*
 922  * This is called once the connection has been negotiated.  It is used
 923  * for rsyncd, remote-shell, and local connections.
 924  */
 925 int client_run(int f_in, int f_out, pid_t pid, int argc, char *argv[])
 926 {
 927         struct file_list *flist = NULL;
 928         int exit_code = 0, exit_code2 = 0;
 929         char *local_name = NULL;
 930
 931         cleanup_child_pid = pid;
 932         if (!read_batch) {
 933                 set_nonblocking(f_in);
 934                 set_nonblocking(f_out);
 935         }
 936
 937         io_set_sock_fds(f_in, f_out);
 938         setup_protocol(f_out,f_in);
 939 #if defined HAVE_ICONV_OPEN && defined HAVE_ICONV_H
 940         setup_iconv();
 941 #endif
 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                 if (protocol_version >= 30)
 956                         io_start_multiplex_out();
 957                 else
 958                         io_start_buffering_out(f_out);
 959                 if (!filesfrom_host)
 960                         set_msg_fd_in(f_in);
 961                 send_filter_list(f_out);
 962                 if (filesfrom_host)
 963                         filesfrom_fd = f_in;
 964
 965                 if (write_batch && !am_server)
 966                         start_write_batch(f_out);
 967                 flist = send_file_list(f_out, argc, argv);
 968                 set_msg_fd_in(-1);
 969                 if (verbose > 3)
 970                         rprintf(FINFO,"file list sent\n");
 971
 972                 if (protocol_version >= 23)
 973                         io_start_multiplex_in();
 974
 975                 io_flush(NORMAL_FLUSH);
 976                 send_files(f_in, f_out);
 977                 io_flush(FULL_FLUSH);
 978                 handle_stats(-1);
 979                 if (protocol_version >= 24)
 980                         read_final_goodbye(f_in, f_out);
 981                 if (pid != -1) {
 982                         if (verbose > 3)
 983                                 rprintf(FINFO,"client_run waiting on %d\n", (int) pid);
 984                         io_flush(FULL_FLUSH);
 985                         wait_process_with_flush(pid, &exit_code);
 986                 }
 987                 output_summary();
 988                 io_flush(FULL_FLUSH);
 989                 exit_cleanup(exit_code);
 990         }
 991
 992         if (!read_batch) {
 993                 if (protocol_version >= 23)
 994                         io_start_multiplex_in();
 995                 if (need_messages_from_generator)
 996                         io_start_multiplex_out();
 997         }
 998
 999         if (argc == 0)
1000                 list_only |= 1;
1001
1002         send_filter_list(read_batch ? -1 : f_out);
1003
1004         if (filesfrom_fd >= 0) {
1005                 io_set_filesfrom_fds(filesfrom_fd, f_out);
1006                 filesfrom_fd = -1;
1007         }
1008
1009         if (write_batch && !am_server)
1010                 start_write_batch(f_in);
1011         flist = recv_file_list(f_in);
1012         if (incremental && file_total == 1)
1013                 recv_additional_file_list(f_in);
1014
1015         if (flist && flist->count > 0) {
1016                 local_name = get_local_name(flist, argv[0]);
1017
1018                 fix_basis_dirs();
1019
1020                 exit_code2 = do_recv(f_in, f_out, local_name);
1021         } else {
1022                 handle_stats(-1);
1023                 output_summary();
1024         }
1025
1026         if (pid != -1) {
1027                 if (verbose > 3)
1028                         rprintf(FINFO,"client_run2 waiting on %d\n", (int) pid);
1029                 io_flush(FULL_FLUSH);
1030                 wait_process_with_flush(pid, &exit_code);
1031         }
1032
1033         return MAX(exit_code, exit_code2);
1034 }
1035
1036 static int copy_argv(char *argv[])
1037 {
1038         int i;
1039
1040         for (i = 0; argv[i]; i++) {
1041                 if (!(argv[i] = strdup(argv[i]))) {
1042                         rprintf (FERROR, "out of memory at %s(%d)\n",
1043                                  __FILE__, __LINE__);
1044                         return RERR_MALLOC;
1045                 }
1046         }
1047
1048         return 0;
1049 }
1050
1051
1052 /**
1053  * Start a client for either type of remote connection.  Work out
1054  * whether the arguments request a remote shell or rsyncd connection,
1055  * and call the appropriate connection function, then run_client.
1056  *
1057  * Calls either start_socket_client (for sockets) or do_cmd and
1058  * client_run (for ssh).
1059  **/
1060 static int start_client(int argc, char *argv[])
1061 {
1062         char *p;
1063         char *shell_machine = NULL;
1064         char *shell_path = NULL;
1065         char *shell_user = NULL;
1066         int ret;
1067         pid_t pid;
1068         int f_in,f_out;
1069         int rc;
1070
1071         /* Don't clobber argv[] so that ps(1) can still show the right
1072          * command line. */
1073         if ((rc = copy_argv(argv)))
1074                 return rc;
1075
1076         if (!read_batch) { /* for read_batch, NO source is specified */
1077                 shell_path = check_for_hostspec(argv[0], &shell_machine, &rsync_port);
1078                 if (shell_path) { /* source is remote */
1079                         char *dummy1;
1080                         int dummy2;
1081                         if (--argc
1082                          && check_for_hostspec(argv[argc], &dummy1, &dummy2)) {
1083                                 rprintf(FERROR,
1084                                         "The source and destination cannot both be remote.\n");
1085                                 exit_cleanup(RERR_SYNTAX);
1086                         }
1087                         argv++;
1088                         if (filesfrom_host && *filesfrom_host
1089                             && strcmp(filesfrom_host, shell_machine) != 0) {
1090                                 rprintf(FERROR,
1091                                         "--files-from hostname is not the same as the transfer hostname\n");
1092                                 exit_cleanup(RERR_SYNTAX);
1093                         }
1094                         if (rsync_port) {
1095                                 if (!shell_cmd) {
1096                                         return start_socket_client(shell_machine,
1097                                                                    shell_path,
1098                                                                    argc, argv);
1099                                 }
1100                                 daemon_over_rsh = 1;
1101                         }
1102
1103                         am_sender = 0;
1104                 } else { /* source is local, check dest arg */
1105                         am_sender = 1;
1106
1107                         if (argc > 1)
1108                                 p = argv[--argc];
1109                         else {
1110                                 p = ".";
1111                                 list_only = 1;
1112                         }
1113
1114                         shell_path = check_for_hostspec(p, &shell_machine, &rsync_port);
1115                         if (shell_path && filesfrom_host && *filesfrom_host
1116                             && strcmp(filesfrom_host, shell_machine) != 0) {
1117                                 rprintf(FERROR,
1118                                         "--files-from hostname is not the same as the transfer hostname\n");
1119                                 exit_cleanup(RERR_SYNTAX);
1120                         }
1121                         if (!shell_path) { /* no hostspec found, so src & dest are local */
1122                                 local_server = 1;
1123                                 if (filesfrom_host) {
1124                                         rprintf(FERROR,
1125                                                 "--files-from cannot be remote when the transfer is local\n");
1126                                         exit_cleanup(RERR_SYNTAX);
1127                                 }
1128                                 shell_machine = NULL;
1129                                 shell_path = p;
1130                         } else if (rsync_port) {
1131                                 if (!shell_cmd) {
1132                                         return start_socket_client(shell_machine,
1133                                                                    shell_path,
1134                                                                    argc, argv);
1135                                 }
1136                                 daemon_over_rsh = 1;
1137                         }
1138                 }
1139         } else {  /* read_batch */
1140                 local_server = 1;
1141                 shell_path = argv[argc-1];
1142                 if (check_for_hostspec(shell_path, &shell_machine, &rsync_port)) {
1143                         rprintf(FERROR, "remote destination is not allowed with --read-batch\n");
1144                         exit_cleanup(RERR_SYNTAX);
1145                 }
1146         }
1147
1148         if (password_file && !daemon_over_rsh) {
1149                 rprintf(FERROR, "The --password-file option may only be "
1150                                 "used when accessing an rsync daemon.\n");
1151                 exit_cleanup(RERR_SYNTAX);
1152         }
1153
1154         if (shell_machine) {
1155                 p = strrchr(shell_machine,'@');
1156                 if (p) {
1157                         *p = 0;
1158                         shell_user = shell_machine;
1159                         shell_machine = p+1;
1160                 }
1161         }
1162
1163         if (verbose > 3) {
1164                 rprintf(FINFO,"cmd=%s machine=%s user=%s path=%s\n",
1165                         shell_cmd ? shell_cmd : "",
1166                         shell_machine ? shell_machine : "",
1167                         shell_user ? shell_user : "",
1168                         shell_path ? shell_path : "");
1169         }
1170
1171         /* for remote source, only single dest arg can remain ... */
1172         if (!am_sender && argc > 1) {
1173                 usage(FERROR);
1174                 exit_cleanup(RERR_SYNTAX);
1175         }
1176
1177         /* ... or no dest at all */
1178         if (!am_sender && argc == 0)
1179                 list_only |= 1;
1180
1181         pid = do_cmd(shell_cmd,shell_machine,shell_user,shell_path,
1182                      &f_in,&f_out);
1183
1184         /* if we're running an rsync server on the remote host over a
1185          * remote shell command, we need to do the RSYNCD protocol first */
1186         if (daemon_over_rsh) {
1187                 int tmpret;
1188                 tmpret = start_inband_exchange(shell_user, shell_path,
1189                                                f_in, f_out, argc);
1190                 if (tmpret < 0)
1191                         return tmpret;
1192         }
1193
1194         ret = client_run(f_in, f_out, pid, argc, argv);
1195
1196         fflush(stdout);
1197         fflush(stderr);
1198
1199         return ret;
1200 }
1201
1202
1203 static RETSIGTYPE sigusr1_handler(UNUSED(int val))
1204 {
1205         exit_cleanup(RERR_SIGNAL1);
1206 }
1207
1208 static RETSIGTYPE sigusr2_handler(UNUSED(int val))
1209 {
1210         if (!am_server)
1211                 output_summary();
1212         close_all();
1213         if (log_got_error)
1214                 _exit(RERR_PARTIAL);
1215         _exit(0);
1216 }
1217
1218 RETSIGTYPE remember_children(UNUSED(int val))
1219 {
1220 #ifdef WNOHANG
1221         int cnt, status;
1222         pid_t pid;
1223         /* An empty waitpid() loop was put here by Tridge and we could never
1224          * get him to explain why he put it in, so rather than taking it
1225          * out we're instead saving the child exit statuses for later use.
1226          * The waitpid() loop presumably eliminates all possibility of leaving
1227          * zombie children, maybe that's why he did it. */
1228         while ((pid = waitpid(-1, &status, WNOHANG)) > 0) {
1229                 /* save the child's exit status */
1230                 for (cnt = 0; cnt < MAXCHILDPROCS; cnt++) {
1231                         if (pid_stat_table[cnt].pid == 0) {
1232                                 pid_stat_table[cnt].pid = pid;
1233                                 pid_stat_table[cnt].status = status;
1234                                 break;
1235                         }
1236                 }
1237         }
1238 #endif
1239 #ifndef HAVE_SIGACTION
1240         signal(SIGCHLD, remember_children);
1241 #endif
1242 }
1243
1244
1245 /**
1246  * This routine catches signals and tries to send them to gdb.
1247  *
1248  * Because it's called from inside a signal handler it ought not to
1249  * use too many library routines.
1250  *
1251  * @todo Perhaps use "screen -X" instead/as well, to help people
1252  * debugging without easy access to X.  Perhaps use an environment
1253  * variable, or just call a script?
1254  *
1255  * @todo The /proc/ magic probably only works on Linux (and
1256  * Solaris?)  Can we be more portable?
1257  **/
1258 #ifdef MAINTAINER_MODE
1259 const char *get_panic_action(void)
1260 {
1261         const char *cmd_fmt = getenv("RSYNC_PANIC_ACTION");
1262
1263         if (cmd_fmt)
1264                 return cmd_fmt;
1265         else
1266                 return "xterm -display :0 -T Panic -n Panic "
1267                         "-e gdb /proc/%d/exe %d";
1268 }
1269
1270
1271 /**
1272  * Handle a fatal signal by launching a debugger, controlled by $RSYNC_PANIC_ACTION.
1273  *
1274  * This signal handler is only installed if we were configured with
1275  * --enable-maintainer-mode.  Perhaps it should always be on and we
1276  * should just look at the environment variable, but I'm a bit leery
1277  * of a signal sending us into a busy loop.
1278  **/
1279 static RETSIGTYPE rsync_panic_handler(UNUSED(int whatsig))
1280 {
1281         char cmd_buf[300];
1282         int ret;
1283
1284         snprintf(cmd_buf, sizeof cmd_buf, get_panic_action(),
1285                  getpid(), getpid());
1286
1287         /* Unless we failed to execute gdb, we allow the process to
1288          * continue.  I'm not sure if that's right. */
1289         ret = system(cmd_buf);
1290         if (ret)
1291                 _exit(ret);
1292 }
1293 #endif
1294
1295
1296 int main(int argc,char *argv[])
1297 {
1298         int ret;
1299         int orig_argc = argc;
1300         char **orig_argv = argv;
1301 #ifdef HAVE_SIGACTION
1302 # ifdef HAVE_SIGPROCMASK
1303         sigset_t sigmask;
1304
1305         sigemptyset(&sigmask);
1306 # endif
1307         sigact.sa_flags = SA_NOCLDSTOP;
1308 #endif
1309         SIGACTMASK(SIGUSR1, sigusr1_handler);
1310         SIGACTMASK(SIGUSR2, sigusr2_handler);
1311         SIGACTMASK(SIGCHLD, remember_children);
1312 #ifdef MAINTAINER_MODE
1313         SIGACTMASK(SIGSEGV, rsync_panic_handler);
1314         SIGACTMASK(SIGFPE, rsync_panic_handler);
1315         SIGACTMASK(SIGABRT, rsync_panic_handler);
1316         SIGACTMASK(SIGBUS, rsync_panic_handler);
1317 #endif
1318
1319         starttime = time(NULL);
1320         am_root = (MY_UID() == 0);
1321
1322         memset(&stats, 0, sizeof(stats));
1323
1324         if (argc < 2) {
1325                 usage(FERROR);
1326                 exit_cleanup(RERR_SYNTAX);
1327         }
1328
1329         /* we set a 0 umask so that correct file permissions can be
1330          * carried across */
1331         orig_umask = umask(0);
1332
1333 #if defined CONFIG_LOCALE && defined HAVE_SETLOCALE
1334         setlocale(LC_CTYPE, "");
1335 #endif
1336
1337         if (!parse_arguments(&argc, (const char ***) &argv, 1)) {
1338                 /* FIXME: We ought to call the same error-handling
1339                  * code here, rather than relying on getopt. */
1340                 option_error();
1341                 exit_cleanup(RERR_SYNTAX);
1342         }
1343
1344         SIGACTMASK(SIGINT, sig_int);
1345         SIGACTMASK(SIGHUP, sig_int);
1346         SIGACTMASK(SIGTERM, sig_int);
1347 #if defined HAVE_SIGACTION && HAVE_SIGPROCMASK
1348         sigprocmask(SIG_UNBLOCK, &sigmask, NULL);
1349 #endif
1350
1351         /* Ignore SIGPIPE; we consistently check error codes and will
1352          * see the EPIPE. */
1353         SIGACTION(SIGPIPE, SIG_IGN);
1354 #ifdef SIGXFSZ
1355         SIGACTION(SIGXFSZ, SIG_IGN);
1356 #endif
1357
1358         /* Initialize push_dir here because on some old systems getcwd
1359          * (implemented by forking "pwd" and reading its output) doesn't
1360          * work when there are other child processes.  Also, on all systems
1361          * that implement getcwd that way "pwd" can't be found after chroot. */
1362         push_dir(NULL, 0);
1363
1364         init_flist();
1365
1366         if ((write_batch || read_batch) && !am_server) {
1367                 if (write_batch)
1368                         write_batch_shell_file(orig_argc, orig_argv, argc);
1369
1370                 if (read_batch && strcmp(batch_name, "-") == 0)
1371                         batch_fd = STDIN_FILENO;
1372                 else {
1373                         batch_fd = do_open(batch_name,
1374                                    write_batch ? O_WRONLY | O_CREAT | O_TRUNC
1375                                    : O_RDONLY, S_IRUSR | S_IWUSR);
1376                 }
1377                 if (batch_fd < 0) {
1378                         rsyserr(FERROR, errno, "Batch file %s open error",
1379                                 full_fname(batch_name));
1380                         exit_cleanup(RERR_FILEIO);
1381                 }
1382                 if (read_batch)
1383                         read_stream_flags(batch_fd);
1384                 else
1385                         write_stream_flags(batch_fd);
1386
1387         }
1388         if (write_batch < 0)
1389                 dry_run = 1;
1390
1391         if (am_daemon && !am_server)
1392                 return daemon_main();
1393
1394         if (argc < 1) {
1395                 usage(FERROR);
1396                 exit_cleanup(RERR_SYNTAX);
1397         }
1398
1399         if (am_server) {
1400                 set_nonblocking(STDIN_FILENO);
1401                 set_nonblocking(STDOUT_FILENO);
1402                 if (am_daemon)
1403                         return start_daemon(STDIN_FILENO, STDOUT_FILENO);
1404                 start_server(STDIN_FILENO, STDOUT_FILENO, argc, argv);
1405         }
1406
1407         ret = start_client(argc, argv);
1408         if (ret == -1)
1409                 exit_cleanup(RERR_STARTCLIENT);
1410         else
1411                 exit_cleanup(ret);
1412
1413         return ret;
1414 }