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