main.c

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