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 sock_f_in;
  67 extern int sock_f_out;
  68 extern int filesfrom_fd;
  69 extern int connect_timeout;
  70 extern pid_t cleanup_child_pid;
  71 extern unsigned int module_dirlen;
  72 extern struct stats stats;
  73 extern char *stdout_format;
  74 extern char *logfile_format;
  75 extern char *filesfrom_host;
  76 extern char *partial_dir;
  77 extern char *dest_option;
  78 extern char *rsync_path;
  79 extern char *shell_cmd;
  80 extern char *batch_name;
  81 extern char *password_file;
  82 extern char *backup_dir;
  83 extern char curr_dir[MAXPATHLEN];
  84 extern char backup_dir_buf[MAXPATHLEN];
  85 extern char *basis_dir[MAX_BASIS_DIRS+1];
  86 extern struct file_list *first_flist;
  87 extern filter_rule_list daemon_filter_list;
  88
  89 uid_t our_uid;
  90 gid_t our_gid;
  91 int am_generator = 0;
  92 int local_server = 0;
  93 int daemon_over_rsh = 0;
  94 mode_t orig_umask = 0;
  95 int batch_gen_fd = -1;
  96 int sender_keeps_checksum = 0;
  97
  98 /* There's probably never more than at most 2 outstanding child processes,
  99  * but set it higher, just in case. */
 100 #define MAXCHILDPROCS 7
 101
 102 #ifdef HAVE_SIGACTION
 103 # ifdef HAVE_SIGPROCMASK
 104 #  define SIGACTMASK(n,h) SIGACTION(n,h), sigaddset(&sigmask,(n))
 105 # else
 106 #  define SIGACTMASK(n,h) SIGACTION(n,h)
 107 # endif
 108 static struct sigaction sigact;
 109 #endif
 110
 111 struct pid_status {
 112         pid_t pid;
 113         int status;
 114 } pid_stat_table[MAXCHILDPROCS];
 115
 116 static time_t starttime, endtime;
 117 static int64 total_read, total_written;
 118
 119 static void show_malloc_stats(void);
 120
 121 /* Works like waitpid(), but if we already harvested the child pid in our
 122  * remember_children(), we succeed instead of returning an error. */
 123 pid_t wait_process(pid_t pid, int *status_ptr, int flags)
 124 {
 125         pid_t waited_pid;
 126
 127         do {
 128                 waited_pid = waitpid(pid, status_ptr, flags);
 129         } while (waited_pid == -1 && errno == EINTR);
 130
 131         if (waited_pid == -1 && errno == ECHILD) {
 132                 /* Status of requested child no longer available:  check to
 133                  * see if it was processed by remember_children(). */
 134                 int cnt;
 135                 for (cnt = 0; cnt < MAXCHILDPROCS; cnt++) {
 136                         if (pid == pid_stat_table[cnt].pid) {
 137                                 *status_ptr = pid_stat_table[cnt].status;
 138                                 pid_stat_table[cnt].pid = 0;
 139                                 return pid;
 140                         }
 141                 }
 142         }
 143
 144         return waited_pid;
 145 }
 146
 147 /* Wait for a process to exit, calling io_flush while waiting. */
 148 static void wait_process_with_flush(pid_t pid, int *exit_code_ptr)
 149 {
 150         pid_t waited_pid;
 151         int status;
 152
 153         while ((waited_pid = wait_process(pid, &status, WNOHANG)) == 0) {
 154                 msleep(20);
 155                 io_flush(FULL_FLUSH);
 156         }
 157
 158         /* TODO: If the child exited on a signal, then log an
 159          * appropriate error message.  Perhaps we should also accept a
 160          * message describing the purpose of the child.  Also indicate
 161          * this to the caller so that they know something went wrong. */
 162         if (waited_pid < 0) {
 163                 rsyserr(FERROR, errno, "waitpid");
 164                 *exit_code_ptr = RERR_WAITCHILD;
 165         } else if (!WIFEXITED(status)) {
 166 #ifdef WCOREDUMP
 167                 if (WCOREDUMP(status))
 168                         *exit_code_ptr = RERR_CRASHED;
 169                 else
 170 #endif
 171                 if (WIFSIGNALED(status))
 172                         *exit_code_ptr = RERR_TERMINATED;
 173                 else
 174                         *exit_code_ptr = RERR_WAITCHILD;
 175         } else
 176                 *exit_code_ptr = WEXITSTATUS(status);
 177 }
 178
 179 void write_del_stats(int f)
 180 {
 181         if (read_batch)
 182                 write_int(f, NDX_DEL_STATS);
 183         else
 184                 send_msg(MSG_DEL_STATS, "", 0, 0);
 185         write_varint(f, stats.deleted_files - stats.deleted_dirs
 186                       - stats.deleted_symlinks - stats.deleted_devices
 187                       - stats.deleted_specials);
 188         write_varint(f, stats.deleted_dirs);
 189         write_varint(f, stats.deleted_symlinks);
 190         write_varint(f, stats.deleted_devices);
 191         write_varint(f, stats.deleted_specials);
 192 }
 193
 194 void read_del_stats(int f)
 195 {
 196         stats.deleted_files = read_varint(f);
 197         stats.deleted_files += stats.deleted_dirs = read_varint(f);
 198         stats.deleted_files += stats.deleted_symlinks = read_varint(f);
 199         stats.deleted_files += stats.deleted_devices = read_varint(f);
 200         stats.deleted_files += stats.deleted_specials = read_varint(f);
 201 }
 202
 203 /* This function gets called from all 3 processes.  We want the client side
 204  * to actually output the text, but the sender is the only process that has
 205  * all the stats we need.  So, if we're a client sender, we do the report.
 206  * If we're a server sender, we write the stats on the supplied fd.  If
 207  * we're the client receiver we read the stats from the supplied fd and do
 208  * the report.  All processes might also generate a set of debug stats, if
 209  * the verbose level is high enough (this is the only thing that the
 210  * generator process and the server receiver ever do here). */
 211 static void handle_stats(int f)
 212 {
 213         endtime = time(NULL);
 214
 215         /* Cache two stats because the read/write code can change it. */
 216         total_read = stats.total_read;
 217         total_written = stats.total_written;
 218
 219         if (INFO_GTE(STATS, 3)) {
 220                 /* These come out from every process */
 221                 show_malloc_stats();
 222                 show_flist_stats();
 223         }
 224
 225         if (am_generator)
 226                 return;
 227
 228         if (am_daemon) {
 229                 if (f == -1 || !am_sender)
 230                         return;
 231         }
 232
 233         if (am_server) {
 234                 if (am_sender) {
 235                         write_varlong30(f, total_read, 3);
 236                         write_varlong30(f, total_written, 3);
 237                         write_varlong30(f, stats.total_size, 3);
 238                         if (protocol_version >= 29) {
 239                                 write_varlong30(f, stats.flist_buildtime, 3);
 240                                 write_varlong30(f, stats.flist_xfertime, 3);
 241                         }
 242                 }
 243                 return;
 244         }
 245
 246         /* this is the client */
 247
 248         if (f < 0 && !am_sender) /* e.g. when we got an empty file list. */
 249                 ;
 250         else if (!am_sender) {
 251                 /* Read the first two in opposite order because the meaning of
 252                  * read/write swaps when switching from sender to receiver. */
 253                 total_written = read_varlong30(f, 3);
 254                 total_read = read_varlong30(f, 3);
 255                 stats.total_size = read_varlong30(f, 3);
 256                 if (protocol_version >= 29) {
 257                         stats.flist_buildtime = read_varlong30(f, 3);
 258                         stats.flist_xfertime = read_varlong30(f, 3);
 259                 }
 260         } else if (write_batch) {
 261                 /* The --read-batch process is going to be a client
 262                  * receiver, so we need to give it the stats. */
 263                 write_varlong30(batch_fd, total_read, 3);
 264                 write_varlong30(batch_fd, total_written, 3);
 265                 write_varlong30(batch_fd, stats.total_size, 3);
 266                 if (protocol_version >= 29) {
 267                         write_varlong30(batch_fd, stats.flist_buildtime, 3);
 268                         write_varlong30(batch_fd, stats.flist_xfertime, 3);
 269                 }
 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, int f_out)
 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, xname, &xlen);
 729                 if (protocol_version >= 31 && i == NDX_DONE) {
 730                         if (am_sender)
 731                                 write_ndx(f_out, NDX_DONE);
 732                         else {
 733                                 if (batch_gen_fd >= 0) {
 734                                         while (read_int(batch_gen_fd) != NDX_DEL_STATS) {}
 735                                         read_del_stats(batch_gen_fd);
 736                                 }
 737                                 send_msg(MSG_DONE, "", 0, 0);
 738                         }
 739                         i = read_ndx_and_attrs(f_in, &iflags, &fnamecmp_type, xname, &xlen);
 740                 }
 741         }
 742
 743         if (i != NDX_DONE) {
 744                 rprintf(FERROR, "Invalid packet at end of run (%d) [%s]\n",
 745                         i, who_am_i());
 746                 exit_cleanup(RERR_PROTOCOL);
 747         }
 748 }
 749
 750 static void do_server_sender(int f_in, int f_out, int argc, char *argv[])
 751 {
 752         struct file_list *flist;
 753         char *dir = argv[0];
 754
 755         if (DEBUG_GTE(SEND, 1)) {
 756                 rprintf(FINFO, "server_sender starting pid=%ld\n",
 757                         (long)getpid());
 758         }
 759
 760         if (am_daemon && lp_write_only(module_id)) {
 761                 rprintf(FERROR, "ERROR: module is write only\n");
 762                 exit_cleanup(RERR_SYNTAX);
 763                 return;
 764         }
 765         if (am_daemon && lp_read_only(module_id) && remove_source_files) {
 766                 rprintf(FERROR,
 767                     "ERROR: --remove-%s-files cannot be used with a read-only module\n",
 768                     remove_source_files == 1 ? "source" : "sent");
 769                 exit_cleanup(RERR_SYNTAX);
 770                 return;
 771         }
 772
 773         if (!relative_paths) {
 774                 if (!change_dir(dir, CD_NORMAL)) {
 775                         rsyserr(FERROR, errno, "change_dir#3 %s failed",
 776                                 full_fname(dir));
 777                         exit_cleanup(RERR_FILESELECT);
 778                 }
 779         }
 780         argc--;
 781         argv++;
 782
 783         if (argc == 0 && (recurse || xfer_dirs || list_only)) {
 784                 argc = 1;
 785                 argv--;
 786                 argv[0] = ".";
 787         }
 788
 789         flist = send_file_list(f_out,argc,argv);
 790         if (!flist || flist->used == 0)
 791                 exit_cleanup(0);
 792
 793         io_start_buffering_in(f_in);
 794
 795         send_files(f_in, f_out);
 796         io_flush(FULL_FLUSH);
 797         handle_stats(f_out);
 798         if (protocol_version >= 24)
 799                 read_final_goodbye(f_in, f_out);
 800         io_flush(FULL_FLUSH);
 801         exit_cleanup(0);
 802 }
 803
 804
 805 static int do_recv(int f_in, int f_out, char *local_name)
 806 {
 807         int pid;
 808         int exit_code = 0;
 809         int error_pipe[2];
 810
 811         /* The receiving side mustn't obey this, or an existing symlink that
 812          * points to an identical file won't be replaced by the referent. */
 813         copy_links = copy_dirlinks = copy_unsafe_links = 0;
 814
 815 #ifdef SUPPORT_HARD_LINKS
 816         if (preserve_hard_links && !inc_recurse)
 817                 match_hard_links(first_flist);
 818 #endif
 819
 820         if (fd_pair(error_pipe) < 0) {
 821                 rsyserr(FERROR, errno, "pipe failed in do_recv");
 822                 exit_cleanup(RERR_IPC);
 823         }
 824
 825         if (backup_dir) {
 826                 int ret = make_path(backup_dir_buf, MKP_DROP_NAME); /* drops trailing slash */
 827                 if (ret < 0)
 828                         exit_cleanup(RERR_SYNTAX);
 829                 if (ret)
 830                         rprintf(FINFO, "Created backup_dir %s\n", backup_dir_buf);
 831                 else if (INFO_GTE(BACKUP, 1))
 832                         rprintf(FINFO, "backup_dir is %s\n", backup_dir_buf);
 833         }
 834
 835         io_flush(NORMAL_FLUSH);
 836
 837         if ((pid = do_fork()) == -1) {
 838                 rsyserr(FERROR, errno, "fork failed in do_recv");
 839                 exit_cleanup(RERR_IPC);
 840         }
 841
 842         if (pid == 0) {
 843                 close(error_pipe[0]);
 844                 if (f_in != f_out)
 845                         close(f_out);
 846                 sock_f_out = -1;
 847
 848                 /* we can't let two processes write to the socket at one time */
 849                 io_end_multiplex_out();
 850
 851                 /* set place to send errors */
 852                 set_msg_fd_out(error_pipe[1]);
 853                 io_start_multiplex_out(error_pipe[1]);
 854
 855                 recv_files(f_in, local_name);
 856                 io_flush(FULL_FLUSH);
 857                 handle_stats(f_in);
 858
 859                 if (output_needs_newline) {
 860                         fputc('\n', stdout);
 861                         output_needs_newline = 0;
 862                 }
 863
 864                 send_msg(MSG_DONE, "", 1, 0);
 865                 write_varlong(error_pipe[1], stats.total_read, 3);
 866                 io_flush(FULL_FLUSH);
 867
 868                 /* Handle any keep-alive packets from the post-processing work
 869                  * that the generator does. */
 870                 if (protocol_version >= 29) {
 871                         kluge_around_eof = -1;
 872
 873                         /* This should only get stopped via a USR2 signal. */
 874                         read_final_goodbye(f_in, f_out);
 875
 876                         rprintf(FERROR, "Invalid packet at end of run [%s]\n",
 877                                 who_am_i());
 878                         exit_cleanup(RERR_PROTOCOL);
 879                 }
 880
 881                 /* Finally, we go to sleep until our parent kills us with a
 882                  * USR2 signal.  We sleep for a short time, as on some OSes
 883                  * a signal won't interrupt a sleep! */
 884                 while (1)
 885                         msleep(20);
 886         }
 887
 888         am_generator = 1;
 889
 890         io_end_multiplex_in();
 891         if (write_batch && !am_server)
 892                 stop_write_batch();
 893
 894         close(error_pipe[1]);
 895         if (f_in != f_out)
 896                 close(f_in);
 897         sock_f_in = -1;
 898
 899         io_start_buffering_out(f_out);
 900
 901         set_msg_fd_in(error_pipe[0]);
 902         io_start_multiplex_in(error_pipe[0]);
 903
 904 #ifdef SUPPORT_HARD_LINKS
 905         if (preserve_hard_links && inc_recurse) {
 906                 struct file_list *flist;
 907                 for (flist = first_flist; flist; flist = flist->next)
 908                         match_hard_links(flist);
 909         }
 910 #endif
 911
 912         generate_files(f_out, local_name);
 913
 914         handle_stats(-1);
 915         io_flush(FULL_FLUSH);
 916         if (protocol_version >= 24) {
 917                 /* send a final goodbye message */
 918                 write_ndx(f_out, NDX_DONE);
 919         }
 920         io_flush(FULL_FLUSH);
 921
 922         set_msg_fd_in(-1);
 923         kill(pid, SIGUSR2);
 924         wait_process_with_flush(pid, &exit_code);
 925         return exit_code;
 926 }
 927
 928 static void do_server_recv(int f_in, int f_out, int argc, char *argv[])
 929 {
 930         int exit_code;
 931         struct file_list *flist;
 932         char *local_name = NULL;
 933         int negated_levels;
 934
 935         if (filesfrom_fd >= 0 && !msgs2stderr) {
 936                 /* We can't mix messages with files-from data on the socket,
 937                  * so temporarily turn off info/debug messages. */
 938                 negate_output_levels();
 939                 negated_levels = 1;
 940         } else
 941                 negated_levels = 0;
 942
 943         if (DEBUG_GTE(RECV, 1)) {
 944                 rprintf(FINFO, "server_recv(%d) starting pid=%ld\n",
 945                         argc, (long)getpid());
 946         }
 947
 948         if (am_daemon && lp_read_only(module_id)) {
 949                 rprintf(FERROR,"ERROR: module is read only\n");
 950                 exit_cleanup(RERR_SYNTAX);
 951                 return;
 952         }
 953
 954         if (argc > 0) {
 955                 char *dir = argv[0];
 956                 argc--;
 957                 argv++;
 958                 if (!am_daemon && !change_dir(dir, CD_NORMAL)) {
 959                         rsyserr(FERROR, errno, "change_dir#4 %s failed",
 960                                 full_fname(dir));
 961                         exit_cleanup(RERR_FILESELECT);
 962                 }
 963         }
 964
 965         if (protocol_version >= 30)
 966                 io_start_multiplex_in(f_in);
 967         else
 968                 io_start_buffering_in(f_in);
 969         recv_filter_list(f_in);
 970
 971         if (filesfrom_fd >= 0) {
 972                 /* We need to send the files-from names to the sender at the
 973                  * same time that we receive the file-list from them, so we
 974                  * need the IO routines to automatically write out the names
 975                  * onto our f_out socket as we read the file-list.  This
 976                  * avoids both deadlock and extra delays/buffers. */
 977                 io_set_filesfrom_fds(filesfrom_fd, f_out);
 978                 filesfrom_fd = -1;
 979         }
 980
 981         flist = recv_file_list(f_in);
 982         if (!flist) {
 983                 rprintf(FERROR,"server_recv: recv_file_list error\n");
 984                 exit_cleanup(RERR_FILESELECT);
 985         }
 986         if (inc_recurse && file_total == 1)
 987                 recv_additional_file_list(f_in);
 988
 989         if (negated_levels)
 990                 negate_output_levels();
 991
 992         if (argc > 0)
 993                 local_name = get_local_name(flist,argv[0]);
 994
 995         /* Now that we know what our destination directory turned out to be,
 996          * we can sanitize the --link-/copy-/compare-dest args correctly. */
 997         if (sanitize_paths) {
 998                 char **dir_p;
 999                 for (dir_p = basis_dir; *dir_p; dir_p++)
1000                         *dir_p = sanitize_path(NULL, *dir_p, NULL, curr_dir_depth, SP_DEFAULT);
1001                 if (partial_dir)
1002                         partial_dir = sanitize_path(NULL, partial_dir, NULL, curr_dir_depth, SP_DEFAULT);
1003         }
1004         check_alt_basis_dirs();
1005
1006         if (daemon_filter_list.head) {
1007                 char **dir_p;
1008                 filter_rule_list *elp = &daemon_filter_list;
1009
1010                 for (dir_p = basis_dir; *dir_p; dir_p++) {
1011                         char *dir = *dir_p;
1012                         if (*dir == '/')
1013                                 dir += module_dirlen;
1014                         if (check_filter(elp, FLOG, dir, 1) < 0)
1015                                 goto options_rejected;
1016                 }
1017                 if (partial_dir && *partial_dir == '/'
1018                  && check_filter(elp, FLOG, partial_dir + module_dirlen, 1) < 0) {
1019                     options_rejected:
1020                         rprintf(FERROR,
1021                                 "Your options have been rejected by the server.\n");
1022                         exit_cleanup(RERR_SYNTAX);
1023                 }
1024         }
1025
1026         exit_code = do_recv(f_in, f_out, local_name);
1027         exit_cleanup(exit_code);
1028 }
1029
1030
1031 int child_main(int argc, char *argv[])
1032 {
1033         start_server(STDIN_FILENO, STDOUT_FILENO, argc, argv);
1034         return 0;
1035 }
1036
1037
1038 void start_server(int f_in, int f_out, int argc, char *argv[])
1039 {
1040         set_nonblocking(f_in);
1041         set_nonblocking(f_out);
1042
1043         io_set_sock_fds(f_in, f_out);
1044         setup_protocol(f_out, f_in);
1045
1046         if (protocol_version >= 23)
1047                 io_start_multiplex_out(f_out);
1048
1049         if (am_sender) {
1050                 keep_dirlinks = 0; /* Must be disabled on the sender. */
1051                 if (need_messages_from_generator)
1052                         io_start_multiplex_in(f_in);
1053                 recv_filter_list(f_in);
1054                 do_server_sender(f_in, f_out, argc, argv);
1055         } else
1056                 do_server_recv(f_in, f_out, argc, argv);
1057         exit_cleanup(0);
1058 }
1059
1060
1061 /*
1062  * This is called once the connection has been negotiated.  It is used
1063  * for rsyncd, remote-shell, and local connections.
1064  */
1065 int client_run(int f_in, int f_out, pid_t pid, int argc, char *argv[])
1066 {
1067         struct file_list *flist = NULL;
1068         int exit_code = 0, exit_code2 = 0;
1069         char *local_name = NULL;
1070
1071         cleanup_child_pid = pid;
1072         if (!read_batch) {
1073                 set_nonblocking(f_in);
1074                 set_nonblocking(f_out);
1075         }
1076
1077         io_set_sock_fds(f_in, f_out);
1078         setup_protocol(f_out,f_in);
1079
1080         /* We set our stderr file handle to blocking because ssh might have
1081          * set it to non-blocking.  This can be particularly troublesome if
1082          * stderr is a clone of stdout, because ssh would have set our stdout
1083          * to non-blocking at the same time (which can easily cause us to lose
1084          * output from our print statements).  This kluge shouldn't cause ssh
1085          * any problems for how we use it.  Note also that we delayed setting
1086          * this until after the above protocol setup so that we know for sure
1087          * that ssh is done twiddling its file descriptors.  */
1088         set_blocking(STDERR_FILENO);
1089
1090         if (am_sender) {
1091                 keep_dirlinks = 0; /* Must be disabled on the sender. */
1092
1093                 if (always_checksum
1094                  && (log_format_has(stdout_format, 'C')
1095                   || log_format_has(logfile_format, 'C')))
1096                         sender_keeps_checksum = 1;
1097
1098                 if (protocol_version >= 30)
1099                         io_start_multiplex_out(f_out);
1100                 else
1101                         io_start_buffering_out(f_out);
1102                 if (!filesfrom_host)
1103                         set_msg_fd_in(f_in);
1104                 send_filter_list(f_out);
1105                 if (filesfrom_host)
1106                         filesfrom_fd = f_in;
1107
1108                 if (write_batch && !am_server)
1109                         start_write_batch(f_out);
1110                 flist = send_file_list(f_out, argc, argv);
1111                 if (DEBUG_GTE(FLIST, 3))
1112                         rprintf(FINFO,"file list sent\n");
1113
1114                 if (protocol_version >= 23)
1115                         io_start_multiplex_in(f_in);
1116
1117                 io_flush(NORMAL_FLUSH);
1118                 send_files(f_in, f_out);
1119                 io_flush(FULL_FLUSH);
1120                 handle_stats(-1);
1121                 if (protocol_version >= 24)
1122                         read_final_goodbye(f_in, f_out);
1123                 if (pid != -1) {
1124                         if (DEBUG_GTE(EXIT, 2))
1125                                 rprintf(FINFO,"client_run waiting on %d\n", (int) pid);
1126                         io_flush(FULL_FLUSH);
1127                         wait_process_with_flush(pid, &exit_code);
1128                 }
1129                 output_summary();
1130                 io_flush(FULL_FLUSH);
1131                 exit_cleanup(exit_code);
1132         }
1133
1134         if (!read_batch) {
1135                 if (protocol_version >= 23)
1136                         io_start_multiplex_in(f_in);
1137                 if (need_messages_from_generator)
1138                         io_start_multiplex_out(f_out);
1139         }
1140
1141         send_filter_list(read_batch ? -1 : f_out);
1142
1143         if (filesfrom_fd >= 0) {
1144                 io_set_filesfrom_fds(filesfrom_fd, f_out);
1145                 filesfrom_fd = -1;
1146         }
1147
1148         if (write_batch && !am_server)
1149                 start_write_batch(f_in);
1150         flist = recv_file_list(f_in);
1151         if (inc_recurse && file_total == 1)
1152                 recv_additional_file_list(f_in);
1153
1154         if (flist && flist->used > 0) {
1155                 local_name = get_local_name(flist, argv[0]);
1156
1157                 check_alt_basis_dirs();
1158
1159                 exit_code2 = do_recv(f_in, f_out, local_name);
1160         } else {
1161                 handle_stats(-1);
1162                 output_summary();
1163         }
1164
1165         if (pid != -1) {
1166                 if (DEBUG_GTE(RECV, 1))
1167                         rprintf(FINFO,"client_run2 waiting on %d\n", (int) pid);
1168                 io_flush(FULL_FLUSH);
1169                 wait_process_with_flush(pid, &exit_code);
1170         }
1171
1172         return MAX(exit_code, exit_code2);
1173 }
1174
1175 static int copy_argv(char *argv[])
1176 {
1177         int i;
1178
1179         for (i = 0; argv[i]; i++) {
1180                 if (!(argv[i] = strdup(argv[i]))) {
1181                         rprintf (FERROR, "out of memory at %s(%d)\n",
1182                                  __FILE__, __LINE__);
1183                         return RERR_MALLOC;
1184                 }
1185         }
1186
1187         return 0;
1188 }
1189
1190
1191 /**
1192  * Start a client for either type of remote connection.  Work out
1193  * whether the arguments request a remote shell or rsyncd connection,
1194  * and call the appropriate connection function, then run_client.
1195  *
1196  * Calls either start_socket_client (for sockets) or do_cmd and
1197  * client_run (for ssh).
1198  **/
1199 static int start_client(int argc, char *argv[])
1200 {
1201         char *p, *shell_machine = NULL, *shell_user = NULL;
1202         char **remote_argv;
1203         int remote_argc;
1204         int f_in, f_out;
1205         int ret;
1206         pid_t pid;
1207
1208         /* Don't clobber argv[] so that ps(1) can still show the right
1209          * command line. */
1210         if ((ret = copy_argv(argv)) != 0)
1211                 return ret;
1212
1213         if (!read_batch) { /* for read_batch, NO source is specified */
1214                 char *path = check_for_hostspec(argv[0], &shell_machine, &rsync_port);
1215                 if (path) { /* source is remote */
1216                         char *dummy_host;
1217                         int dummy_port = 0;
1218                         *argv = path;
1219                         remote_argv = argv;
1220                         remote_argc = argc;
1221                         argv += argc - 1;
1222                         if (argc == 1 || **argv == ':')
1223                                 argc = 0; /* no dest arg */
1224                         else if (check_for_hostspec(*argv, &dummy_host, &dummy_port)) {
1225                                 rprintf(FERROR,
1226                                         "The source and destination cannot both be remote.\n");
1227                                 exit_cleanup(RERR_SYNTAX);
1228                         } else {
1229                                 remote_argc--; /* don't count dest */
1230                                 argc = 1;
1231                         }
1232                         if (filesfrom_host && *filesfrom_host
1233                             && strcmp(filesfrom_host, shell_machine) != 0) {
1234                                 rprintf(FERROR,
1235                                         "--files-from hostname is not the same as the transfer hostname\n");
1236                                 exit_cleanup(RERR_SYNTAX);
1237                         }
1238                         am_sender = 0;
1239                         if (rsync_port)
1240                                 daemon_over_rsh = shell_cmd ? 1 : -1;
1241                 } else { /* source is local, check dest arg */
1242                         am_sender = 1;
1243
1244                         if (argc > 1) {
1245                                 p = argv[--argc];
1246                                 remote_argv = argv + argc;
1247                         } else {
1248                                 static char *dotarg[1] = { "." };
1249                                 p = dotarg[0];
1250                                 remote_argv = dotarg;
1251                         }
1252                         remote_argc = 1;
1253
1254                         path = check_for_hostspec(p, &shell_machine, &rsync_port);
1255                         if (path && filesfrom_host && *filesfrom_host
1256                             && strcmp(filesfrom_host, shell_machine) != 0) {
1257                                 rprintf(FERROR,
1258                                         "--files-from hostname is not the same as the transfer hostname\n");
1259                                 exit_cleanup(RERR_SYNTAX);
1260                         }
1261                         if (!path) { /* no hostspec found, so src & dest are local */
1262                                 local_server = 1;
1263                                 if (filesfrom_host) {
1264                                         rprintf(FERROR,
1265                                                 "--files-from cannot be remote when the transfer is local\n");
1266                                         exit_cleanup(RERR_SYNTAX);
1267                                 }
1268                                 shell_machine = NULL;
1269                         } else { /* hostspec was found, so dest is remote */
1270                                 argv[argc] = path;
1271                                 if (rsync_port)
1272                                         daemon_over_rsh = shell_cmd ? 1 : -1;
1273                         }
1274                 }
1275         } else {  /* read_batch */
1276                 local_server = 1;
1277                 if (check_for_hostspec(argv[argc-1], &shell_machine, &rsync_port)) {
1278                         rprintf(FERROR, "remote destination is not allowed with --read-batch\n");
1279                         exit_cleanup(RERR_SYNTAX);
1280                 }
1281                 remote_argv = argv += argc - 1;
1282                 remote_argc = argc = 1;
1283         }
1284
1285         if (am_sender) {
1286                 char *dummy_host;
1287                 int dummy_port = rsync_port;
1288                 int i;
1289                 /* For local source, extra source args must not have hostspec. */
1290                 for (i = 1; i < argc; i++) {
1291                         if (check_for_hostspec(argv[i], &dummy_host, &dummy_port)) {
1292                                 rprintf(FERROR, "Unexpected remote arg: %s\n", argv[i]);
1293                                 exit_cleanup(RERR_SYNTAX);
1294                         }
1295                 }
1296         } else {
1297                 char *dummy_host;
1298                 int dummy_port = rsync_port;
1299                 int i;
1300                 /* For remote source, any extra source args must have either
1301                  * the same hostname or an empty hostname. */
1302                 for (i = 1; i < remote_argc; i++) {
1303                         char *arg = check_for_hostspec(remote_argv[i], &dummy_host, &dummy_port);
1304                         if (!arg) {
1305                                 rprintf(FERROR, "Unexpected local arg: %s\n", remote_argv[i]);
1306                                 rprintf(FERROR, "If arg is a remote file/dir, prefix it with a colon (:).\n");
1307                                 exit_cleanup(RERR_SYNTAX);
1308                         }
1309                         if (*dummy_host && strcmp(dummy_host, shell_machine) != 0) {
1310                                 rprintf(FERROR, "All source args must come from the same machine.\n");
1311                                 exit_cleanup(RERR_SYNTAX);
1312                         }
1313                         if (rsync_port != dummy_port) {
1314                                 if (!rsync_port || !dummy_port)
1315                                         rprintf(FERROR, "All source args must use the same hostspec format.\n");
1316                                 else
1317                                         rprintf(FERROR, "All source args must use the same port number.\n");
1318                                 exit_cleanup(RERR_SYNTAX);
1319                         }
1320                         remote_argv[i] = arg;
1321                 }
1322         }
1323
1324         if (daemon_over_rsh < 0)
1325                 return start_socket_client(shell_machine, remote_argc, remote_argv, argc, argv);
1326
1327         if (password_file && !daemon_over_rsh) {
1328                 rprintf(FERROR, "The --password-file option may only be "
1329                                 "used when accessing an rsync daemon.\n");
1330                 exit_cleanup(RERR_SYNTAX);
1331         }
1332
1333         if (connect_timeout) {
1334                 rprintf(FERROR, "The --contimeout option may only be "
1335                                 "used when connecting to an rsync daemon.\n");
1336                 exit_cleanup(RERR_SYNTAX);
1337         }
1338
1339         if (shell_machine) {
1340                 p = strrchr(shell_machine,'@');
1341                 if (p) {
1342                         *p = 0;
1343                         shell_user = shell_machine;
1344                         shell_machine = p+1;
1345                 }
1346         }
1347
1348         if (DEBUG_GTE(CMD, 2)) {
1349                 rprintf(FINFO,"cmd=%s machine=%s user=%s path=%s\n",
1350                         NS(shell_cmd), NS(shell_machine), NS(shell_user),
1351                         remote_argv ? NS(remote_argv[0]) : "");
1352         }
1353
1354         pid = do_cmd(shell_cmd, shell_machine, shell_user, remote_argv, remote_argc,
1355                      &f_in, &f_out);
1356
1357         /* if we're running an rsync server on the remote host over a
1358          * remote shell command, we need to do the RSYNCD protocol first */
1359         if (daemon_over_rsh) {
1360                 int tmpret;
1361                 tmpret = start_inband_exchange(f_in, f_out, shell_user, remote_argc, remote_argv);
1362                 if (tmpret < 0)
1363                         return tmpret;
1364         }
1365
1366         ret = client_run(f_in, f_out, pid, argc, argv);
1367
1368         fflush(stdout);
1369         fflush(stderr);
1370
1371         return ret;
1372 }
1373
1374
1375 static RETSIGTYPE sigusr1_handler(UNUSED(int val))
1376 {
1377         exit_cleanup(RERR_SIGNAL1);
1378 }
1379
1380 static RETSIGTYPE sigusr2_handler(UNUSED(int val))
1381 {
1382         if (!am_server)
1383                 output_summary();
1384         close_all();
1385         if (got_xfer_error)
1386                 _exit(RERR_PARTIAL);
1387         _exit(0);
1388 }
1389
1390 RETSIGTYPE remember_children(UNUSED(int val))
1391 {
1392 #ifdef WNOHANG
1393         int cnt, status;
1394         pid_t pid;
1395         /* An empty waitpid() loop was put here by Tridge and we could never
1396          * get him to explain why he put it in, so rather than taking it
1397          * out we're instead saving the child exit statuses for later use.
1398          * The waitpid() loop presumably eliminates all possibility of leaving
1399          * zombie children, maybe that's why he did it. */
1400         while ((pid = waitpid(-1, &status, WNOHANG)) > 0) {
1401                 /* save the child's exit status */
1402                 for (cnt = 0; cnt < MAXCHILDPROCS; cnt++) {
1403                         if (pid_stat_table[cnt].pid == 0) {
1404                                 pid_stat_table[cnt].pid = pid;
1405                                 pid_stat_table[cnt].status = status;
1406                                 break;
1407                         }
1408                 }
1409         }
1410 #endif
1411 #ifndef HAVE_SIGACTION
1412         signal(SIGCHLD, remember_children);
1413 #endif
1414 }
1415
1416
1417 /**
1418  * This routine catches signals and tries to send them to gdb.
1419  *
1420  * Because it's called from inside a signal handler it ought not to
1421  * use too many library routines.
1422  *
1423  * @todo Perhaps use "screen -X" instead/as well, to help people
1424  * debugging without easy access to X.  Perhaps use an environment
1425  * variable, or just call a script?
1426  *
1427  * @todo The /proc/ magic probably only works on Linux (and
1428  * Solaris?)  Can we be more portable?
1429  **/
1430 #ifdef MAINTAINER_MODE
1431 const char *get_panic_action(void)
1432 {
1433         const char *cmd_fmt = getenv("RSYNC_PANIC_ACTION");
1434
1435         if (cmd_fmt)
1436                 return cmd_fmt;
1437         else
1438                 return "xterm -display :0 -T Panic -n Panic "
1439                         "-e gdb /proc/%d/exe %d";
1440 }
1441
1442
1443 /**
1444  * Handle a fatal signal by launching a debugger, controlled by $RSYNC_PANIC_ACTION.
1445  *
1446  * This signal handler is only installed if we were configured with
1447  * --enable-maintainer-mode.  Perhaps it should always be on and we
1448  * should just look at the environment variable, but I'm a bit leery
1449  * of a signal sending us into a busy loop.
1450  **/
1451 static RETSIGTYPE rsync_panic_handler(UNUSED(int whatsig))
1452 {
1453         char cmd_buf[300];
1454         int ret;
1455
1456         snprintf(cmd_buf, sizeof cmd_buf, get_panic_action(),
1457                  getpid(), getpid());
1458
1459         /* Unless we failed to execute gdb, we allow the process to
1460          * continue.  I'm not sure if that's right. */
1461         ret = system(cmd_buf);
1462         if (ret)
1463                 _exit(ret);
1464 }
1465 #endif
1466
1467
1468 int main(int argc,char *argv[])
1469 {
1470         int ret;
1471         int orig_argc = argc;
1472         char **orig_argv = argv;
1473 #ifdef HAVE_SIGACTION
1474 # ifdef HAVE_SIGPROCMASK
1475         sigset_t sigmask;
1476
1477         sigemptyset(&sigmask);
1478 # endif
1479         sigact.sa_flags = SA_NOCLDSTOP;
1480 #endif
1481         SIGACTMASK(SIGUSR1, sigusr1_handler);
1482         SIGACTMASK(SIGUSR2, sigusr2_handler);
1483         SIGACTMASK(SIGCHLD, remember_children);
1484 #ifdef MAINTAINER_MODE
1485         SIGACTMASK(SIGSEGV, rsync_panic_handler);
1486         SIGACTMASK(SIGFPE, rsync_panic_handler);
1487         SIGACTMASK(SIGABRT, rsync_panic_handler);
1488         SIGACTMASK(SIGBUS, rsync_panic_handler);
1489 #endif
1490
1491         starttime = time(NULL);
1492         our_uid = MY_UID();
1493         our_gid = MY_GID();
1494         am_root = our_uid == 0;
1495
1496         memset(&stats, 0, sizeof(stats));
1497
1498         if (argc < 2) {
1499                 usage(FERROR);
1500                 exit_cleanup(RERR_SYNTAX);
1501         }
1502
1503         /* we set a 0 umask so that correct file permissions can be
1504          * carried across */
1505         orig_umask = umask(0);
1506
1507 #if defined CONFIG_LOCALE && defined HAVE_SETLOCALE
1508         setlocale(LC_CTYPE, "");
1509 #endif
1510
1511         if (!parse_arguments(&argc, (const char ***) &argv)) {
1512                 /* FIXME: We ought to call the same error-handling
1513                  * code here, rather than relying on getopt. */
1514                 option_error();
1515                 exit_cleanup(RERR_SYNTAX);
1516         }
1517
1518         SIGACTMASK(SIGINT, sig_int);
1519         SIGACTMASK(SIGHUP, sig_int);
1520         SIGACTMASK(SIGTERM, sig_int);
1521 #if defined HAVE_SIGACTION && HAVE_SIGPROCMASK
1522         sigprocmask(SIG_UNBLOCK, &sigmask, NULL);
1523 #endif
1524
1525         /* Ignore SIGPIPE; we consistently check error codes and will
1526          * see the EPIPE. */
1527         SIGACTION(SIGPIPE, SIG_IGN);
1528 #ifdef SIGXFSZ
1529         SIGACTION(SIGXFSZ, SIG_IGN);
1530 #endif
1531
1532         /* Initialize change_dir() here because on some old systems getcwd
1533          * (implemented by forking "pwd" and reading its output) doesn't
1534          * work when there are other child processes.  Also, on all systems
1535          * that implement getcwd that way "pwd" can't be found after chroot. */
1536         change_dir(NULL, CD_NORMAL);
1537
1538         init_flist();
1539
1540         if ((write_batch || read_batch) && !am_server) {
1541                 if (write_batch)
1542                         write_batch_shell_file(orig_argc, orig_argv, argc);
1543
1544                 if (read_batch && strcmp(batch_name, "-") == 0)
1545                         batch_fd = STDIN_FILENO;
1546                 else {
1547                         batch_fd = do_open(batch_name,
1548                                    write_batch ? O_WRONLY | O_CREAT | O_TRUNC
1549                                    : O_RDONLY, S_IRUSR | S_IWUSR);
1550                 }
1551                 if (batch_fd < 0) {
1552                         rsyserr(FERROR, errno, "Batch file %s open error",
1553                                 full_fname(batch_name));
1554                         exit_cleanup(RERR_FILEIO);
1555                 }
1556                 if (read_batch)
1557                         read_stream_flags(batch_fd);
1558                 else
1559                         write_stream_flags(batch_fd);
1560         }
1561         if (write_batch < 0)
1562                 dry_run = 1;
1563
1564         if (am_server) {
1565 #ifdef ICONV_CONST
1566                 setup_iconv();
1567 #endif
1568         } else if (am_daemon)
1569                 return daemon_main();
1570
1571         if (am_server && protect_args) {
1572                 char buf[MAXPATHLEN];
1573                 protect_args = 2;
1574                 read_args(STDIN_FILENO, NULL, buf, sizeof buf, 1, &argv, &argc, NULL);
1575                 if (!parse_arguments(&argc, (const char ***) &argv)) {
1576                         option_error();
1577                         exit_cleanup(RERR_SYNTAX);
1578                 }
1579         }
1580
1581         if (argc < 1) {
1582                 usage(FERROR);
1583                 exit_cleanup(RERR_SYNTAX);
1584         }
1585
1586         if (am_server) {
1587                 set_nonblocking(STDIN_FILENO);
1588                 set_nonblocking(STDOUT_FILENO);
1589                 if (am_daemon)
1590                         return start_daemon(STDIN_FILENO, STDOUT_FILENO);
1591                 start_server(STDIN_FILENO, STDOUT_FILENO, argc, argv);
1592         }
1593
1594         ret = start_client(argc, argv);
1595         if (ret == -1)
1596                 exit_cleanup(RERR_STARTCLIENT);
1597         else
1598                 exit_cleanup(ret);
1599
1600         return ret;
1601 }