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