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