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