main.c

   1 /*
   2  * The startup routines, including main(), for rsync.
   3  *
   4  * Copyright (C) 1996-2001 Andrew Tridgell <tridge@samba.org>
   5  * Copyright (C) 1996 Paul Mackerras
   6  * Copyright (C) 2001, 2002 Martin Pool <mbp@samba.org>
   7  * Copyright (C) 2003-2009 Wayne Davison
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 3 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License along
  20  * with this program; if not, visit the http://fsf.org website.
  21  */
  22
  23 #include "rsync.h"
  24 #include "inums.h"
  25 #include "io.h"
  26 #if defined CONFIG_LOCALE && defined HAVE_LOCALE_H
  27 #include <locale.h>
  28 #endif
  29
  30 extern int dry_run;
  31 extern int list_only;
  32 extern int io_timeout;
  33 extern int am_root;
  34 extern int am_server;
  35 extern int am_sender;
  36 extern int am_daemon;
  37 extern int inc_recurse;
  38 extern int blocking_io;
  39 extern int always_checksum;
  40 extern int remove_source_files;
  41 extern int output_needs_newline;
  42 extern int need_messages_from_generator;
  43 extern int kluge_around_eof;
  44 extern int got_xfer_error;
  45 extern int msgs2stderr;
  46 extern int module_id;
  47 extern int read_only;
  48 extern int copy_links;
  49 extern int copy_dirlinks;
  50 extern int copy_unsafe_links;
  51 extern int keep_dirlinks;
  52 extern int preserve_hard_links;
  53 extern int protocol_version;
  54 extern int file_total;
  55 extern int recurse;
  56 extern int xfer_dirs;
  57 extern int protect_args;
  58 extern int relative_paths;
  59 extern int sanitize_paths;
  60 extern int curr_dir_depth;
  61 extern int curr_dir_len;
  62 extern int module_id;
  63 extern int rsync_port;
  64 extern int whole_file;
  65 extern int read_batch;
  66 extern int write_batch;
  67 extern int batch_fd;
  68 extern int sock_f_in;
  69 extern int sock_f_out;
  70 extern int filesfrom_fd;
  71 extern int connect_timeout;
  72 extern int send_msgs_to_gen;
  73 extern pid_t cleanup_child_pid;
  74 extern size_t bwlimit_writemax;
  75 extern unsigned int module_dirlen;
  76 extern BOOL flist_receiving_enabled;
  77 extern BOOL shutting_down;
  78 extern struct stats stats;
  79 extern char *stdout_format;
  80 extern char *logfile_format;
  81 extern char *filesfrom_host;
  82 extern char *partial_dir;
  83 extern char *dest_option;
  84 extern char *rsync_path;
  85 extern char *shell_cmd;
  86 extern char *batch_name;
  87 extern char *password_file;
  88 extern char *backup_dir;
  89 extern char curr_dir[MAXPATHLEN];
  90 extern char backup_dir_buf[MAXPATHLEN];
  91 extern char *basis_dir[MAX_BASIS_DIRS+1];
  92 extern struct file_list *first_flist;
  93 extern filter_rule_list daemon_filter_list;
  94
  95 uid_t our_uid;
  96 gid_t our_gid;
  97 int am_generator = 0;
  98 int local_server = 0;
  99 int daemon_over_rsh = 0;
 100 mode_t orig_umask = 0;
 101 int batch_gen_fd = -1;
 102 int sender_keeps_checksum = 0;
 103
 104 /* There's probably never more than at most 2 outstanding child processes,
 105  * but set it higher, just in case. */
 106 #define MAXCHILDPROCS 7
 107
 108 #ifdef HAVE_SIGACTION
 109 # ifdef HAVE_SIGPROCMASK
 110 #  define SIGACTMASK(n,h) SIGACTION(n,h), sigaddset(&sigmask,(n))
 111 # else
 112 #  define SIGACTMASK(n,h) SIGACTION(n,h)
 113 # endif
 114 static struct sigaction sigact;
 115 #endif
 116
 117 struct pid_status {
 118         pid_t pid;
 119         int status;
 120 } pid_stat_table[MAXCHILDPROCS];
 121
 122 static time_t starttime, endtime;
 123 static int64 total_read, total_written;
 124
 125 static void show_malloc_stats(void);
 126
 127 /* Works like waitpid(), but if we already harvested the child pid in our
 128  * remember_children(), we succeed instead of returning an error. */
 129 pid_t wait_process(pid_t pid, int *status_ptr, int flags)
 130 {
 131         pid_t waited_pid;
 132
 133         do {
 134                 waited_pid = waitpid(pid, status_ptr, flags);
 135         } while (waited_pid == -1 && errno == EINTR);
 136
 137         if (waited_pid == -1 && errno == ECHILD) {
 138                 /* Status of requested child no longer available:  check to
 139                  * see if it was processed by remember_children(). */
 140                 int cnt;
 141                 for (cnt = 0; cnt < MAXCHILDPROCS; cnt++) {
 142                         if (pid == pid_stat_table[cnt].pid) {
 143                                 *status_ptr = pid_stat_table[cnt].status;
 144                                 pid_stat_table[cnt].pid = 0;
 145                                 return pid;
 146                         }
 147                 }
 148         }
 149
 150         return waited_pid;
 151 }
 152
 153 /* Wait for a process to exit, calling io_flush while waiting. */
 154 static void wait_process_with_flush(pid_t pid, int *exit_code_ptr)
 155 {
 156         pid_t waited_pid;
 157         int status;
 158
 159         while ((waited_pid = wait_process(pid, &status, WNOHANG)) == 0) {
 160                 msleep(20);
 161                 io_flush(FULL_FLUSH);
 162         }
 163
 164         /* TODO: If the child exited on a signal, then log an
 165          * appropriate error message.  Perhaps we should also accept a
 166          * message describing the purpose of the child.  Also indicate
 167          * this to the caller so that they know something went wrong. */
 168         if (waited_pid < 0) {
 169                 rsyserr(FERROR, errno, "waitpid");
 170                 *exit_code_ptr = RERR_WAITCHILD;
 171         } else if (!WIFEXITED(status)) {
 172 #ifdef WCOREDUMP
 173                 if (WCOREDUMP(status))
 174                         *exit_code_ptr = RERR_CRASHED;
 175                 else
 176 #endif
 177                 if (WIFSIGNALED(status))
 178                         *exit_code_ptr = RERR_TERMINATED;
 179                 else
 180                         *exit_code_ptr = RERR_WAITCHILD;
 181         } else
 182                 *exit_code_ptr = WEXITSTATUS(status);
 183 }
 184
 185 void write_del_stats(int f)
 186 {
 187         if (read_batch)
 188                 write_int(f, NDX_DEL_STATS);
 189         else
 190                 write_ndx(f, NDX_DEL_STATS);
 191         write_varint(f, stats.deleted_files - stats.deleted_dirs
 192                       - stats.deleted_symlinks - stats.deleted_devices
 193                       - stats.deleted_specials);
 194         write_varint(f, stats.deleted_dirs);
 195         write_varint(f, stats.deleted_symlinks);
 196         write_varint(f, stats.deleted_devices);
 197         write_varint(f, stats.deleted_specials);
 198 }
 199
 200 void read_del_stats(int f)
 201 {
 202         stats.deleted_files = read_varint(f);
 203         stats.deleted_files += stats.deleted_dirs = read_varint(f);
 204         stats.deleted_files += stats.deleted_symlinks = read_varint(f);
 205         stats.deleted_files += stats.deleted_devices = read_varint(f);
 206         stats.deleted_files += stats.deleted_specials = read_varint(f);
 207 }
 208
 209 /* This function gets called from all 3 processes.  We want the client side
 210  * to actually output the text, but the sender is the only process that has
 211  * all the stats we need.  So, if we're a client sender, we do the report.
 212  * If we're a server sender, we write the stats on the supplied fd.  If
 213  * we're the client receiver we read the stats from the supplied fd and do
 214  * the report.  All processes might also generate a set of debug stats, if
 215  * the verbose level is high enough (this is the only thing that the
 216  * generator process and the server receiver ever do here). */
 217 static void handle_stats(int f)
 218 {
 219         endtime = time(NULL);
 220
 221         /* Cache two stats because the read/write code can change it. */
 222         total_read = stats.total_read;
 223         total_written = stats.total_written;
 224
 225         if (INFO_GTE(STATS, 3)) {
 226                 /* These come out from every process */
 227                 show_malloc_stats();
 228                 show_flist_stats();
 229         }
 230
 231         if (am_generator)
 232                 return;
 233
 234         if (am_daemon) {
 235                 if (f == -1 || !am_sender)
 236                         return;
 237         }
 238
 239         if (am_server) {
 240                 if (am_sender) {
 241                         write_varlong30(f, total_read, 3);
 242                         write_varlong30(f, total_written, 3);
 243                         write_varlong30(f, stats.total_size, 3);
 244                         if (protocol_version >= 29) {
 245                                 write_varlong30(f, stats.flist_buildtime, 3);
 246                                 write_varlong30(f, stats.flist_xfertime, 3);
 247                         }
 248                 }
 249                 return;
 250         }
 251
 252         /* this is the client */
 253
 254         if (f < 0 && !am_sender) /* e.g. when we got an empty file list. */
 255                 ;
 256         else if (!am_sender) {
 257                 /* Read the first two in opposite order because the meaning of
 258                  * read/write swaps when switching from sender to receiver. */
 259                 total_written = read_varlong30(f, 3);
 260                 total_read = read_varlong30(f, 3);
 261                 stats.total_size = read_varlong30(f, 3);
 262                 if (protocol_version >= 29) {
 263                         stats.flist_buildtime = read_varlong30(f, 3);
 264                         stats.flist_xfertime = read_varlong30(f, 3);
 265                 }
 266         } else if (write_batch) {
 267                 /* The --read-batch process is going to be a client
 268                  * receiver, so we need to give it the stats. */
 269                 write_varlong30(batch_fd, total_read, 3);
 270                 write_varlong30(batch_fd, total_written, 3);
 271                 write_varlong30(batch_fd, stats.total_size, 3);
 272                 if (protocol_version >= 29) {
 273                         write_varlong30(batch_fd, stats.flist_buildtime, 3);
 274                         write_varlong30(batch_fd, stats.flist_xfertime, 3);
 275                 }
 276         }
 277 }
 278
 279 static void output_itemized_counts(const char *prefix, int *counts)
 280 {
 281         static char *labels[] = { "reg", "dir", "link", "dev", "special" };
 282         char buf[1024], *pre = " (";
 283         int j, len = 0;
 284         int total = counts[0];
 285         if (total) {
 286                 counts[0] -= counts[1] + counts[2] + counts[3] + counts[4];
 287                 for (j = 0; j < 5; j++) {
 288                         if (counts[j]) {
 289                                 len += snprintf(buf+len, sizeof buf - len - 2,
 290                                         "%s%s: %s",
 291                                         pre, labels[j], comma_num(counts[j]));
 292                                 pre = ", ";
 293                         }
 294                 }
 295                 buf[len++] = ')';
 296         }
 297         buf[len] = '\0';
 298         rprintf(FINFO, "%s: %s%s\n", prefix, comma_num(total), buf);
 299 }
 300
 301 static void output_summary(void)
 302 {
 303         if (INFO_GTE(STATS, 2)) {
 304                 rprintf(FCLIENT, "\n");
 305                 output_itemized_counts("Number of files", &stats.num_files);
 306                 if (protocol_version >= 29)
 307                         output_itemized_counts("Number of created files", &stats.created_files);
 308                 if (protocol_version >= 31)
 309                         output_itemized_counts("Number of deleted files", &stats.deleted_files);
 310                 rprintf(FINFO,"Number of regular files transferred: %s\n",
 311                         comma_num(stats.xferred_files));
 312                 rprintf(FINFO,"Total file size: %s bytes\n",
 313                         human_num(stats.total_size));
 314                 rprintf(FINFO,"Total transferred file size: %s bytes\n",
 315                         human_num(stats.total_transferred_size));
 316                 rprintf(FINFO,"Literal data: %s bytes\n",
 317                         human_num(stats.literal_data));
 318                 rprintf(FINFO,"Matched data: %s bytes\n",
 319                         human_num(stats.matched_data));
 320                 rprintf(FINFO,"File list size: %s\n",
 321                         human_num(stats.flist_size));
 322                 if (stats.flist_buildtime) {
 323                         rprintf(FINFO,
 324                                 "File list generation time: %s seconds\n",
 325                                 comma_dnum((double)stats.flist_buildtime / 1000, 3));
 326                         rprintf(FINFO,
 327                                 "File list transfer time: %s seconds\n",
 328                                 comma_dnum((double)stats.flist_xfertime / 1000, 3));
 329                 }
 330                 rprintf(FINFO,"Total bytes sent: %s\n",
 331                         human_num(total_written));
 332                 rprintf(FINFO,"Total bytes received: %s\n",
 333                         human_num(total_read));
 334         }
 335
 336         if (INFO_GTE(STATS, 1)) {
 337                 rprintf(FCLIENT, "\n");
 338                 rprintf(FINFO,
 339                         "sent %s bytes  received %s bytes  %s bytes/sec\n",
 340                         human_num(total_written), human_num(total_read),
 341                         human_dnum((total_written + total_read)/(0.5 + (endtime - starttime)), 2));
 342                 rprintf(FINFO, "total size is %s  speedup is %s%s\n",
 343                         human_num(stats.total_size),
 344                         comma_dnum((double)stats.total_size / (total_written+total_read), 2),
 345                         write_batch < 0 ? " (BATCH ONLY)" : dry_run ? " (DRY RUN)" : "");
 346         }
 347
 348         fflush(stdout);
 349         fflush(stderr);
 350 }
 351
 352
 353 /**
 354  * If our C library can get malloc statistics, then show them to FINFO
 355  **/
 356 static void show_malloc_stats(void)
 357 {
 358 #ifdef HAVE_MALLINFO
 359         struct mallinfo mi;
 360
 361         mi = mallinfo();
 362
 363         rprintf(FCLIENT, "\n");
 364         rprintf(FINFO, RSYNC_NAME "[%d] (%s%s%s) heap statistics:\n",
 365                 getpid(), am_server ? "server " : "",
 366                 am_daemon ? "daemon " : "", who_am_i());
 367         rprintf(FINFO, "  arena:     %10ld   (bytes from sbrk)\n",
 368                 (long)mi.arena);
 369         rprintf(FINFO, "  ordblks:   %10ld   (chunks not in use)\n",
 370                 (long)mi.ordblks);
 371         rprintf(FINFO, "  smblks:    %10ld\n",
 372                 (long)mi.smblks);
 373         rprintf(FINFO, "  hblks:     %10ld   (chunks from mmap)\n",
 374                 (long)mi.hblks);
 375         rprintf(FINFO, "  hblkhd:    %10ld   (bytes from mmap)\n",
 376                 (long)mi.hblkhd);
 377         rprintf(FINFO, "  allmem:    %10ld   (bytes from sbrk + mmap)\n",
 378                 (long)mi.arena + mi.hblkhd);
 379         rprintf(FINFO, "  usmblks:   %10ld\n",
 380                 (long)mi.usmblks);
 381         rprintf(FINFO, "  fsmblks:   %10ld\n",
 382                 (long)mi.fsmblks);
 383         rprintf(FINFO, "  uordblks:  %10ld   (bytes used)\n",
 384                 (long)mi.uordblks);
 385         rprintf(FINFO, "  fordblks:  %10ld   (bytes free)\n",
 386                 (long)mi.fordblks);
 387         rprintf(FINFO, "  keepcost:  %10ld   (bytes in releasable chunk)\n",
 388                 (long)mi.keepcost);
 389 #endif /* HAVE_MALLINFO */
 390 }
 391
 392
 393 /* Start the remote shell.   cmd may be NULL to use the default. */
 394 static pid_t do_cmd(char *cmd, char *machine, char *user, char **remote_argv, int remote_argc,
 395                     int *f_in_p, int *f_out_p)
 396 {
 397         int i, argc = 0;
 398         char *args[MAX_ARGS], *need_to_free = NULL;
 399         pid_t pid;
 400         int dash_l_set = 0;
 401
 402         if (!read_batch && !local_server) {
 403                 char *t, *f, in_quote = '\0';
 404                 char *rsh_env = getenv(RSYNC_RSH_ENV);
 405                 if (!cmd)
 406                         cmd = rsh_env;
 407                 if (!cmd)
 408                         cmd = RSYNC_RSH;
 409                 cmd = need_to_free = strdup(cmd);
 410                 if (!cmd)
 411                         goto oom;
 412
 413                 for (t = f = cmd; *f; f++) {
 414                         if (*f == ' ')
 415                                 continue;
 416                         /* Comparison leaves rooms for server_options(). */
 417                         if (argc >= MAX_ARGS - MAX_SERVER_ARGS)
 418                                 goto arg_overflow;
 419                         args[argc++] = t;
 420                         while (*f != ' ' || in_quote) {
 421                                 if (!*f) {
 422                                         if (in_quote) {
 423                                                 rprintf(FERROR,
 424                                                     "Missing trailing-%c in remote-shell command.\n",
 425                                                     in_quote);
 426                                                 exit_cleanup(RERR_SYNTAX);
 427                                         }
 428                                         f--;
 429                                         break;
 430                                 }
 431                                 if (*f == '\'' || *f == '"') {
 432                                         if (!in_quote) {
 433                                                 in_quote = *f++;
 434                                                 continue;
 435                                         }
 436                                         if (*f == in_quote && *++f != in_quote) {
 437                                                 in_quote = '\0';
 438                                                 continue;
 439                                         }
 440                                 }
 441                                 *t++ = *f++;
 442                         }
 443                         *t++ = '\0';
 444                 }
 445
 446                 /* check to see if we've already been given '-l user' in
 447                  * the remote-shell command */
 448                 for (i = 0; i < argc-1; i++) {
 449                         if (!strcmp(args[i], "-l") && args[i+1][0] != '-')
 450                                 dash_l_set = 1;
 451                 }
 452
 453 #ifdef HAVE_REMSH
 454                 /* remsh (on HPUX) takes the arguments the other way around */
 455                 args[argc++] = machine;
 456                 if (user && !(daemon_over_rsh && dash_l_set)) {
 457                         args[argc++] = "-l";
 458                         args[argc++] = user;
 459                 }
 460 #else
 461                 if (user && !(daemon_over_rsh && dash_l_set)) {
 462                         args[argc++] = "-l";
 463                         args[argc++] = user;
 464                 }
 465                 args[argc++] = machine;
 466 #endif
 467
 468                 args[argc++] = rsync_path;
 469
 470                 if (blocking_io < 0) {
 471                         char *cp;
 472                         if ((cp = strrchr(cmd, '/')) != NULL)
 473                                 cp++;
 474                         else
 475                                 cp = cmd;
 476                         if (strcmp(cp, "rsh") == 0 || strcmp(cp, "remsh") == 0)
 477                                 blocking_io = 1;
 478                 }
 479
 480                 server_options(args,&argc);
 481
 482                 if (argc >= MAX_ARGS - 2)
 483                         goto arg_overflow;
 484         }
 485
 486         args[argc++] = ".";
 487
 488         if (!daemon_over_rsh) {
 489                 while (remote_argc > 0) {
 490                         if (argc >= MAX_ARGS - 1) {
 491                           arg_overflow:
 492                                 rprintf(FERROR, "internal: args[] overflowed in do_cmd()\n");
 493                                 exit_cleanup(RERR_SYNTAX);
 494                         }
 495                         args[argc++] = *remote_argv++;
 496                         remote_argc--;
 497                 }
 498         }
 499
 500         args[argc] = NULL;
 501
 502         if (DEBUG_GTE(CMD, 2)) {
 503                 for (i = 0; i < argc; i++)
 504                         rprintf(FCLIENT, "cmd[%d]=%s ", i, args[i]);
 505                 rprintf(FCLIENT, "\n");
 506         }
 507
 508         if (read_batch) {
 509                 int from_gen_pipe[2];
 510                 set_allow_inc_recurse();
 511                 if (fd_pair(from_gen_pipe) < 0) {
 512                         rsyserr(FERROR, errno, "pipe");
 513                         exit_cleanup(RERR_IPC);
 514                 }
 515                 batch_gen_fd = from_gen_pipe[0];
 516                 *f_out_p = from_gen_pipe[1];
 517                 *f_in_p = batch_fd;
 518                 pid = (pid_t)-1; /* no child pid */
 519 #ifdef ICONV_CONST
 520                 setup_iconv();
 521 #endif
 522         } else if (local_server) {
 523                 /* If the user didn't request --[no-]whole-file, force
 524                  * it on, but only if we're not batch processing. */
 525                 if (whole_file < 0 && !write_batch)
 526                         whole_file = 1;
 527                 set_allow_inc_recurse();
 528                 pid = local_child(argc, args, f_in_p, f_out_p, child_main);
 529 #ifdef ICONV_CONST
 530                 setup_iconv();
 531 #endif
 532         } else {
 533                 pid = piped_child(args, f_in_p, f_out_p);
 534 #ifdef ICONV_CONST
 535                 setup_iconv();
 536 #endif
 537                 if (protect_args && !daemon_over_rsh)
 538                         send_protected_args(*f_out_p, args);
 539         }
 540
 541         if (need_to_free)
 542                 free(need_to_free);
 543
 544         return pid;
 545
 546   oom:
 547         out_of_memory("do_cmd");
 548         return 0; /* not reached */
 549 }
 550
 551 /* The receiving side operates in one of two modes:
 552  *
 553  * 1. it receives any number of files into a destination directory,
 554  * placing them according to their names in the file-list.
 555  *
 556  * 2. it receives a single file and saves it using the name in the
 557  * destination path instead of its file-list name.  This requires a
 558  * "local name" for writing out the destination file.
 559  *
 560  * So, our task is to figure out what mode/local-name we need.
 561  * For mode 1, we change into the destination directory and return NULL.
 562  * For mode 2, we change into the directory containing the destination
 563  * file (if we aren't already there) and return the local-name. */
 564 static char *get_local_name(struct file_list *flist, char *dest_path)
 565 {
 566         STRUCT_STAT st;
 567         int statret;
 568         char *cp;
 569
 570         if (DEBUG_GTE(RECV, 1)) {
 571                 rprintf(FINFO, "get_local_name count=%d %s\n",
 572                         file_total, NS(dest_path));
 573         }
 574
 575         if (!dest_path || list_only)
 576                 return NULL;
 577
 578         if (daemon_filter_list.head) {
 579                 char *slash = strrchr(dest_path, '/');
 580                 if (slash && (slash[1] == '\0' || (slash[1] == '.' && slash[2] == '\0')))
 581                         *slash = '\0';
 582                 else
 583                         slash = NULL;
 584                 if ((*dest_path != '.' || dest_path[1] != '\0')
 585                  && (check_filter(&daemon_filter_list, FLOG, dest_path, 0) < 0
 586                   || check_filter(&daemon_filter_list, FLOG, dest_path, 1) < 0)) {
 587                         rprintf(FERROR, "skipping daemon-excluded destination \"%s\"\n",
 588                                 dest_path);
 589                         exit_cleanup(RERR_FILESELECT);
 590                 }
 591                 if (slash)
 592                         *slash = '/';
 593         }
 594
 595         /* See what currently exists at the destination. */
 596         if ((statret = do_stat(dest_path, &st)) == 0) {
 597                 /* If the destination is a dir, enter it and use mode 1. */
 598                 if (S_ISDIR(st.st_mode)) {
 599                         if (!change_dir(dest_path, CD_NORMAL)) {
 600                                 rsyserr(FERROR, errno, "change_dir#1 %s failed",
 601                                         full_fname(dest_path));
 602                                 exit_cleanup(RERR_FILESELECT);
 603                         }
 604                         return NULL;
 605                 }
 606                 if (file_total > 1) {
 607                         rprintf(FERROR,
 608                                 "ERROR: destination must be a directory when"
 609                                 " copying more than 1 file\n");
 610                         exit_cleanup(RERR_FILESELECT);
 611                 }
 612                 if (file_total == 1 && S_ISDIR(flist->files[0]->mode)) {
 613                         rprintf(FERROR,
 614                                 "ERROR: cannot overwrite non-directory"
 615                                 " with a directory\n");
 616                         exit_cleanup(RERR_FILESELECT);
 617                 }
 618         } else if (errno != ENOENT) {
 619                 /* If we don't know what's at the destination, fail. */
 620                 rsyserr(FERROR, errno, "ERROR: cannot stat destination %s",
 621                         full_fname(dest_path));
 622                 exit_cleanup(RERR_FILESELECT);
 623         }
 624
 625         cp = strrchr(dest_path, '/');
 626
 627         /* If we need a destination directory because the transfer is not
 628          * of a single non-directory or the user has requested one via a
 629          * destination path ending in a slash, create one and use mode 1. */
 630         if (file_total > 1 || (cp && !cp[1])) {
 631                 /* Lop off the final slash (if any). */
 632                 if (cp && !cp[1])
 633                         *cp = '\0';
 634
 635                 if (statret == 0) {
 636                         rprintf(FERROR,
 637                             "ERROR: destination path is not a directory\n");
 638                         exit_cleanup(RERR_SYNTAX);
 639                 }
 640
 641                 if (mkdir_defmode(dest_path) != 0) {
 642                         rsyserr(FERROR, errno, "mkdir %s failed",
 643                                 full_fname(dest_path));
 644                         exit_cleanup(RERR_FILEIO);
 645                 }
 646
 647                 if (flist->high >= flist->low
 648                  && strcmp(flist->files[flist->low]->basename, ".") == 0)
 649                         flist->files[0]->flags |= FLAG_DIR_CREATED;
 650
 651                 if (INFO_GTE(NAME, 1))
 652                         rprintf(FINFO, "created directory %s\n", dest_path);
 653
 654                 if (dry_run) {
 655                         /* Indicate that dest dir doesn't really exist. */
 656                         dry_run++;
 657                 }
 658
 659                 if (!change_dir(dest_path, dry_run > 1 ? CD_SKIP_CHDIR : CD_NORMAL)) {
 660                         rsyserr(FERROR, errno, "change_dir#2 %s failed",
 661                                 full_fname(dest_path));
 662                         exit_cleanup(RERR_FILESELECT);
 663                 }
 664
 665                 return NULL;
 666         }
 667
 668         /* Otherwise, we are writing a single file, possibly on top of an
 669          * existing non-directory.  Change to the item's parent directory
 670          * (if it has a path component), return the basename of the
 671          * destination file as the local name, and use mode 2. */
 672         if (!cp)
 673                 return dest_path;
 674
 675         if (cp == dest_path)
 676                 dest_path = "/";
 677
 678         *cp = '\0';
 679         if (!change_dir(dest_path, CD_NORMAL)) {
 680                 rsyserr(FERROR, errno, "change_dir#3 %s failed",
 681                         full_fname(dest_path));
 682                 exit_cleanup(RERR_FILESELECT);
 683         }
 684         *cp = '/';
 685
 686         return cp + 1;
 687 }
 688
 689 /* This function checks on our alternate-basis directories.  If we're in
 690  * dry-run mode and the destination dir does not yet exist, we'll try to
 691  * tweak any dest-relative paths to make them work for a dry-run (the
 692  * destination dir must be in curr_dir[] when this function is called).
 693  * We also warn about any arg that is non-existent or not a directory. */
 694 static void check_alt_basis_dirs(void)
 695 {
 696         STRUCT_STAT st;
 697         char **dir_p, *slash = strrchr(curr_dir, '/');
 698
 699         for (dir_p = basis_dir; *dir_p; dir_p++) {
 700                 if (dry_run > 1 && **dir_p != '/') {
 701                         int len = curr_dir_len + 1 + strlen(*dir_p) + 1;
 702                         char *new = new_array(char, len);
 703                         if (!new)
 704                                 out_of_memory("check_alt_basis_dirs");
 705                         if (slash && strncmp(*dir_p, "../", 3) == 0) {
 706                             /* We want to remove only one leading "../" prefix for
 707                              * the directory we couldn't create in dry-run mode:
 708                              * this ensures that any other ".." references get
 709                              * evaluated the same as they would for a live copy. */
 710                             *slash = '\0';
 711                             pathjoin(new, len, curr_dir, *dir_p + 3);
 712                             *slash = '/';
 713                         } else
 714                             pathjoin(new, len, curr_dir, *dir_p);
 715                         *dir_p = new;
 716                 }
 717                 if (do_stat(*dir_p, &st) < 0) {
 718                         rprintf(FWARNING, "%s arg does not exist: %s\n",
 719                                 dest_option, *dir_p);
 720                 } else if (!S_ISDIR(st.st_mode)) {
 721                         rprintf(FWARNING, "%s arg is not a dir: %s\n",
 722                                 dest_option, *dir_p);
 723                 }
 724         }
 725 }
 726
 727 /* This is only called by the sender. */
 728 static void read_final_goodbye(int f_in, int f_out)
 729 {
 730         int i, iflags, xlen;
 731         uchar fnamecmp_type;
 732         char xname[MAXPATHLEN];
 733
 734         shutting_down = True;
 735
 736         if (protocol_version < 29)
 737                 i = read_int(f_in);
 738         else {
 739                 i = read_ndx_and_attrs(f_in, f_out, &iflags, &fnamecmp_type, xname, &xlen);
 740                 if (protocol_version >= 31 && i == NDX_DONE) {
 741                         if (am_sender)
 742                                 write_ndx(f_out, NDX_DONE);
 743                         else {
 744                                 if (batch_gen_fd >= 0) {
 745                                         while (read_int(batch_gen_fd) != NDX_DEL_STATS) {}
 746                                         read_del_stats(batch_gen_fd);
 747                                 }
 748                                 write_int(f_out, NDX_DONE);
 749                         }
 750                         i = read_ndx_and_attrs(f_in, f_out, &iflags, &fnamecmp_type, xname, &xlen);
 751                 }
 752         }
 753
 754         if (i != NDX_DONE) {
 755                 rprintf(FERROR, "Invalid packet at end of run (%d) [%s]\n",
 756                         i, who_am_i());
 757                 exit_cleanup(RERR_PROTOCOL);
 758         }
 759 }
 760
 761 static void do_server_sender(int f_in, int f_out, int argc, char *argv[])
 762 {
 763         struct file_list *flist;
 764         char *dir = argv[0];
 765
 766         if (DEBUG_GTE(SEND, 1)) {
 767                 rprintf(FINFO, "server_sender starting pid=%ld\n",
 768                         (long)getpid());
 769         }
 770
 771         if (am_daemon && lp_write_only(module_id)) {
 772                 rprintf(FERROR, "ERROR: module is write only\n");
 773                 exit_cleanup(RERR_SYNTAX);
 774                 return;
 775         }
 776         if (am_daemon && read_only && remove_source_files) {
 777                 rprintf(FERROR,
 778                     "ERROR: --remove-%s-files cannot be used with a read-only module\n",
 779                     remove_source_files == 1 ? "source" : "sent");
 780                 exit_cleanup(RERR_SYNTAX);
 781                 return;
 782         }
 783
 784         if (!relative_paths) {
 785                 if (!change_dir(dir, CD_NORMAL)) {
 786                         rsyserr(FERROR, errno, "change_dir#3 %s failed",
 787                                 full_fname(dir));
 788                         exit_cleanup(RERR_FILESELECT);
 789                 }
 790         }
 791         argc--;
 792         argv++;
 793
 794         if (argc == 0 && (recurse || xfer_dirs || list_only)) {
 795                 argc = 1;
 796                 argv--;
 797                 argv[0] = ".";
 798         }
 799
 800         flist = send_file_list(f_out,argc,argv);
 801         if (!flist || flist->used == 0)
 802                 exit_cleanup(0);
 803
 804         io_start_buffering_in(f_in);
 805
 806         send_files(f_in, f_out);
 807         io_flush(FULL_FLUSH);
 808         handle_stats(f_out);
 809         if (protocol_version >= 24)
 810                 read_final_goodbye(f_in, f_out);
 811         io_flush(FULL_FLUSH);
 812         exit_cleanup(0);
 813 }
 814
 815
 816 static int do_recv(int f_in, int f_out, char *local_name)
 817 {
 818         int pid;
 819         int exit_code = 0;
 820         int error_pipe[2];
 821
 822         /* The receiving side mustn't obey this, or an existing symlink that
 823          * points to an identical file won't be replaced by the referent. */
 824         copy_links = copy_dirlinks = copy_unsafe_links = 0;
 825
 826 #ifdef SUPPORT_HARD_LINKS
 827         if (preserve_hard_links && !inc_recurse)
 828                 match_hard_links(first_flist);
 829 #endif
 830
 831         if (fd_pair(error_pipe) < 0) {
 832                 rsyserr(FERROR, errno, "pipe failed in do_recv");
 833                 exit_cleanup(RERR_IPC);
 834         }
 835
 836         if (backup_dir) {
 837                 int ret = make_path(backup_dir_buf, MKP_DROP_NAME); /* drops trailing slash */
 838                 if (ret < 0)
 839                         exit_cleanup(RERR_SYNTAX);
 840                 if (ret)
 841                         rprintf(FINFO, "Created backup_dir %s\n", backup_dir_buf);
 842                 else if (INFO_GTE(BACKUP, 1))
 843                         rprintf(FINFO, "backup_dir is %s\n", backup_dir_buf);
 844         }
 845
 846         io_flush(FULL_FLUSH);
 847
 848         if ((pid = do_fork()) == -1) {
 849                 rsyserr(FERROR, errno, "fork failed in do_recv");
 850                 exit_cleanup(RERR_IPC);
 851         }
 852
 853         if (pid == 0) {
 854                 send_msgs_to_gen = am_server;
 855
 856                 close(error_pipe[0]);
 857
 858                 /* We can't let two processes write to the socket at one time. */
 859                 io_end_multiplex_out(MPLX_SWITCHING);
 860                 if (f_in != f_out)
 861                         close(f_out);
 862                 sock_f_out = -1;
 863                 f_out = error_pipe[1];
 864
 865                 bwlimit_writemax = 0; /* receiver doesn't need to do this */
 866
 867                 if (read_batch)
 868                         io_start_buffering_in(f_in);
 869                 io_start_multiplex_out(f_out);
 870
 871                 recv_files(f_in, f_out, local_name);
 872                 io_flush(FULL_FLUSH);
 873                 handle_stats(f_in);
 874
 875                 if (output_needs_newline) {
 876                         fputc('\n', stdout);
 877                         output_needs_newline = 0;
 878                 }
 879
 880                 write_int(f_out, NDX_DONE);
 881                 send_msg(MSG_STATS, (char*)&stats.total_read, sizeof stats.total_read, 0);
 882                 io_flush(FULL_FLUSH);
 883
 884                 /* Handle any keep-alive packets from the post-processing work
 885                  * that the generator does. */
 886                 if (protocol_version >= 29) {
 887                         kluge_around_eof = -1;
 888
 889                         /* This should only get stopped via a USR2 signal. */
 890                         read_final_goodbye(f_in, f_out);
 891
 892                         rprintf(FERROR, "Invalid packet at end of run [%s]\n",
 893                                 who_am_i());
 894                         exit_cleanup(RERR_PROTOCOL);
 895                 }
 896
 897                 /* Finally, we go to sleep until our parent kills us with a
 898                  * USR2 signal.  We sleep for a short time, as on some OSes
 899                  * a signal won't interrupt a sleep! */
 900                 while (1)
 901                         msleep(20);
 902         }
 903
 904         am_generator = 1;
 905         flist_receiving_enabled = True;
 906
 907         io_end_multiplex_in(MPLX_SWITCHING);
 908         if (write_batch && !am_server)
 909                 stop_write_batch();
 910
 911         close(error_pipe[1]);
 912         if (f_in != f_out)
 913                 close(f_in);
 914         sock_f_in = -1;
 915         f_in = error_pipe[0];
 916
 917         io_start_buffering_out(f_out);
 918         io_start_multiplex_in(f_in);
 919
 920 #ifdef SUPPORT_HARD_LINKS
 921         if (preserve_hard_links && inc_recurse) {
 922                 struct file_list *flist;
 923                 for (flist = first_flist; flist; flist = flist->next)
 924                         match_hard_links(flist);
 925         }
 926 #endif
 927
 928         generate_files(f_out, local_name);
 929
 930         handle_stats(-1);
 931         io_flush(FULL_FLUSH);
 932         shutting_down = True;
 933         if (protocol_version >= 24) {
 934                 /* send a final goodbye message */
 935                 write_ndx(f_out, NDX_DONE);
 936         }
 937         io_flush(FULL_FLUSH);
 938
 939         kill(pid, SIGUSR2);
 940         wait_process_with_flush(pid, &exit_code);
 941         return exit_code;
 942 }
 943
 944 static void do_server_recv(int f_in, int f_out, int argc, char *argv[])
 945 {
 946         int exit_code;
 947         struct file_list *flist;
 948         char *local_name = NULL;
 949         int negated_levels;
 950
 951         if (filesfrom_fd >= 0 && !msgs2stderr && protocol_version < 31) {
 952                 /* We can't mix messages with files-from data on the socket,
 953                  * so temporarily turn off info/debug messages. */
 954                 negate_output_levels();
 955                 negated_levels = 1;
 956         } else
 957                 negated_levels = 0;
 958
 959         if (DEBUG_GTE(RECV, 1)) {
 960                 rprintf(FINFO, "server_recv(%d) starting pid=%ld\n",
 961                         argc, (long)getpid());
 962         }
 963
 964         if (am_daemon && read_only) {
 965                 rprintf(FERROR,"ERROR: module is read only\n");
 966                 exit_cleanup(RERR_SYNTAX);
 967                 return;
 968         }
 969
 970         if (argc > 0) {
 971                 char *dir = argv[0];
 972                 argc--;
 973                 argv++;
 974                 if (!am_daemon && !change_dir(dir, CD_NORMAL)) {
 975                         rsyserr(FERROR, errno, "change_dir#4 %s failed",
 976                                 full_fname(dir));
 977                         exit_cleanup(RERR_FILESELECT);
 978                 }
 979         }
 980
 981         if (protocol_version >= 30)
 982                 io_start_multiplex_in(f_in);
 983         else
 984                 io_start_buffering_in(f_in);
 985         recv_filter_list(f_in);
 986
 987         if (filesfrom_fd >= 0) {
 988                 /* We need to send the files-from names to the sender at the
 989                  * same time that we receive the file-list from them, so we
 990                  * need the IO routines to automatically write out the names
 991                  * onto our f_out socket as we read the file-list.  This
 992                  * avoids both deadlock and extra delays/buffers. */
 993                 start_filesfrom_forwarding(filesfrom_fd);
 994                 filesfrom_fd = -1;
 995         }
 996
 997         flist = recv_file_list(f_in);
 998         if (!flist) {
 999                 rprintf(FERROR,"server_recv: recv_file_list error\n");
1000                 exit_cleanup(RERR_FILESELECT);
1001         }
1002         if (inc_recurse && file_total == 1)
1003                 recv_additional_file_list(f_in);
1004
1005         if (negated_levels)
1006                 negate_output_levels();
1007
1008         if (argc > 0)
1009                 local_name = get_local_name(flist,argv[0]);
1010
1011         /* Now that we know what our destination directory turned out to be,
1012          * we can sanitize the --link-/copy-/compare-dest args correctly. */
1013         if (sanitize_paths) {
1014                 char **dir_p;
1015                 for (dir_p = basis_dir; *dir_p; dir_p++)
1016                         *dir_p = sanitize_path(NULL, *dir_p, NULL, curr_dir_depth, SP_DEFAULT);
1017                 if (partial_dir)
1018                         partial_dir = sanitize_path(NULL, partial_dir, NULL, curr_dir_depth, SP_DEFAULT);
1019         }
1020         check_alt_basis_dirs();
1021
1022         if (daemon_filter_list.head) {
1023                 char **dir_p;
1024                 filter_rule_list *elp = &daemon_filter_list;
1025
1026                 for (dir_p = basis_dir; *dir_p; dir_p++) {
1027                         char *dir = *dir_p;
1028                         if (*dir == '/')
1029                                 dir += module_dirlen;
1030                         if (check_filter(elp, FLOG, dir, 1) < 0)
1031                                 goto options_rejected;
1032                 }
1033                 if (partial_dir && *partial_dir == '/'
1034                  && check_filter(elp, FLOG, partial_dir + module_dirlen, 1) < 0) {
1035                     options_rejected:
1036                         rprintf(FERROR,
1037                                 "Your options have been rejected by the server.\n");
1038                         exit_cleanup(RERR_SYNTAX);
1039                 }
1040         }
1041
1042         exit_code = do_recv(f_in, f_out, local_name);
1043         exit_cleanup(exit_code);
1044 }
1045
1046
1047 int child_main(int argc, char *argv[])
1048 {
1049         start_server(STDIN_FILENO, STDOUT_FILENO, argc, argv);
1050         return 0;
1051 }
1052
1053
1054 void start_server(int f_in, int f_out, int argc, char *argv[])
1055 {
1056         set_nonblocking(f_in);
1057         set_nonblocking(f_out);
1058
1059         io_set_sock_fds(f_in, f_out);
1060         setup_protocol(f_out, f_in);
1061
1062         if (protocol_version >= 23)
1063                 io_start_multiplex_out(f_out);
1064         if (am_daemon && io_timeout && protocol_version >= 31)
1065                 send_msg_int(MSG_IO_TIMEOUT, io_timeout);
1066
1067         if (am_sender) {
1068                 keep_dirlinks = 0; /* Must be disabled on the sender. */
1069                 if (need_messages_from_generator)
1070                         io_start_multiplex_in(f_in);
1071                 else
1072                         io_start_buffering_in(f_in);
1073                 recv_filter_list(f_in);
1074                 do_server_sender(f_in, f_out, argc, argv);
1075         } else
1076                 do_server_recv(f_in, f_out, argc, argv);
1077         exit_cleanup(0);
1078 }
1079
1080 /* This is called once the connection has been negotiated.  It is used
1081  * for rsyncd, remote-shell, and local connections. */
1082 int client_run(int f_in, int f_out, pid_t pid, int argc, char *argv[])
1083 {
1084         struct file_list *flist = NULL;
1085         int exit_code = 0, exit_code2 = 0;
1086         char *local_name = NULL;
1087
1088         cleanup_child_pid = pid;
1089         if (!read_batch) {
1090                 set_nonblocking(f_in);
1091                 set_nonblocking(f_out);
1092         }
1093
1094         io_set_sock_fds(f_in, f_out);
1095         setup_protocol(f_out,f_in);
1096
1097         /* We set our stderr file handle to blocking because ssh might have
1098          * set it to non-blocking.  This can be particularly troublesome if
1099          * stderr is a clone of stdout, because ssh would have set our stdout
1100          * to non-blocking at the same time (which can easily cause us to lose
1101          * output from our print statements).  This kluge shouldn't cause ssh
1102          * any problems for how we use it.  Note also that we delayed setting
1103          * this until after the above protocol setup so that we know for sure
1104          * that ssh is done twiddling its file descriptors.  */
1105         set_blocking(STDERR_FILENO);
1106
1107         if (am_sender) {
1108                 keep_dirlinks = 0; /* Must be disabled on the sender. */
1109
1110                 if (always_checksum
1111                  && (log_format_has(stdout_format, 'C')
1112                   || log_format_has(logfile_format, 'C')))
1113                         sender_keeps_checksum = 1;
1114
1115                 if (protocol_version >= 30)
1116                         io_start_multiplex_out(f_out);
1117                 else
1118                         io_start_buffering_out(f_out);
1119                 if (protocol_version >= 31 || (!filesfrom_host && protocol_version >= 23))
1120                         io_start_multiplex_in(f_in);
1121                 else
1122                         io_start_buffering_in(f_in);
1123                 send_filter_list(f_out);
1124                 if (filesfrom_host)
1125                         filesfrom_fd = f_in;
1126
1127                 if (write_batch && !am_server)
1128                         start_write_batch(f_out);
1129                 flist = send_file_list(f_out, argc, argv);
1130                 if (DEBUG_GTE(FLIST, 3))
1131                         rprintf(FINFO,"file list sent\n");
1132
1133                 if (protocol_version < 31 && filesfrom_host && protocol_version >= 23)
1134                         io_start_multiplex_in(f_in);
1135
1136                 io_flush(NORMAL_FLUSH);
1137                 send_files(f_in, f_out);
1138                 io_flush(FULL_FLUSH);
1139                 handle_stats(-1);
1140                 if (protocol_version >= 24)
1141                         read_final_goodbye(f_in, f_out);
1142                 if (pid != -1) {
1143                         if (DEBUG_GTE(EXIT, 2))
1144                                 rprintf(FINFO,"client_run waiting on %d\n", (int) pid);
1145                         io_flush(FULL_FLUSH);
1146                         wait_process_with_flush(pid, &exit_code);
1147                 }
1148                 output_summary();
1149                 io_flush(FULL_FLUSH);
1150                 exit_cleanup(exit_code);
1151         }
1152
1153         if (!read_batch) {
1154                 if (protocol_version >= 23)
1155                         io_start_multiplex_in(f_in);
1156                 if (need_messages_from_generator)
1157                         io_start_multiplex_out(f_out);
1158                 else
1159                         io_start_buffering_out(f_out);
1160         }
1161
1162         send_filter_list(read_batch ? -1 : f_out);
1163
1164         if (filesfrom_fd >= 0) {
1165                 start_filesfrom_forwarding(filesfrom_fd);
1166                 filesfrom_fd = -1;
1167         }
1168
1169         if (write_batch && !am_server)
1170                 start_write_batch(f_in);
1171         flist = recv_file_list(f_in);
1172         if (inc_recurse && file_total == 1)
1173                 recv_additional_file_list(f_in);
1174
1175         if (flist && flist->used > 0) {
1176                 local_name = get_local_name(flist, argv[0]);
1177
1178                 check_alt_basis_dirs();
1179
1180                 exit_code2 = do_recv(f_in, f_out, local_name);
1181         } else {
1182                 handle_stats(-1);
1183                 output_summary();
1184         }
1185
1186         if (pid != -1) {
1187                 if (DEBUG_GTE(RECV, 1))
1188                         rprintf(FINFO,"client_run2 waiting on %d\n", (int) pid);
1189                 io_flush(FULL_FLUSH);
1190                 wait_process_with_flush(pid, &exit_code);
1191         }
1192
1193         return MAX(exit_code, exit_code2);
1194 }
1195
1196 static int copy_argv(char *argv[])
1197 {
1198         int i;
1199
1200         for (i = 0; argv[i]; i++) {
1201                 if (!(argv[i] = strdup(argv[i]))) {
1202                         rprintf (FERROR, "out of memory at %s(%d)\n",
1203                                  __FILE__, __LINE__);
1204                         return RERR_MALLOC;
1205                 }
1206         }
1207
1208         return 0;
1209 }
1210
1211
1212 /* Start a client for either type of remote connection.  Work out
1213  * whether the arguments request a remote shell or rsyncd connection,
1214  * and call the appropriate connection function, then run_client.
1215  *
1216  * Calls either start_socket_client (for sockets) or do_cmd and
1217  * client_run (for ssh). */
1218 static int start_client(int argc, char *argv[])
1219 {
1220         char *p, *shell_machine = NULL, *shell_user = NULL;
1221         char **remote_argv;
1222         int remote_argc;
1223         int f_in, f_out;
1224         int ret;
1225         pid_t pid;
1226
1227         /* Don't clobber argv[] so that ps(1) can still show the right
1228          * command line. */
1229         if ((ret = copy_argv(argv)) != 0)
1230                 return ret;
1231
1232         if (!read_batch) { /* for read_batch, NO source is specified */
1233                 char *path = check_for_hostspec(argv[0], &shell_machine, &rsync_port);
1234                 if (path) { /* source is remote */
1235                         char *dummy_host;
1236                         int dummy_port = 0;
1237                         *argv = path;
1238                         remote_argv = argv;
1239                         remote_argc = argc;
1240                         argv += argc - 1;
1241                         if (argc == 1 || **argv == ':')
1242                                 argc = 0; /* no dest arg */
1243                         else if (check_for_hostspec(*argv, &dummy_host, &dummy_port)) {
1244                                 rprintf(FERROR,
1245                                         "The source and destination cannot both be remote.\n");
1246                                 exit_cleanup(RERR_SYNTAX);
1247                         } else {
1248                                 remote_argc--; /* don't count dest */
1249                                 argc = 1;
1250                         }
1251                         if (filesfrom_host && *filesfrom_host
1252                             && strcmp(filesfrom_host, shell_machine) != 0) {
1253                                 rprintf(FERROR,
1254                                         "--files-from hostname is not the same as the transfer hostname\n");
1255                                 exit_cleanup(RERR_SYNTAX);
1256                         }
1257                         am_sender = 0;
1258                         if (rsync_port)
1259                                 daemon_over_rsh = shell_cmd ? 1 : -1;
1260                 } else { /* source is local, check dest arg */
1261                         am_sender = 1;
1262
1263                         if (argc > 1) {
1264                                 p = argv[--argc];
1265                                 remote_argv = argv + argc;
1266                         } else {
1267                                 static char *dotarg[1] = { "." };
1268                                 p = dotarg[0];
1269                                 remote_argv = dotarg;
1270                         }
1271                         remote_argc = 1;
1272
1273                         path = check_for_hostspec(p, &shell_machine, &rsync_port);
1274                         if (path && filesfrom_host && *filesfrom_host
1275                             && strcmp(filesfrom_host, shell_machine) != 0) {
1276                                 rprintf(FERROR,
1277                                         "--files-from hostname is not the same as the transfer hostname\n");
1278                                 exit_cleanup(RERR_SYNTAX);
1279                         }
1280                         if (!path) { /* no hostspec found, so src & dest are local */
1281                                 local_server = 1;
1282                                 if (filesfrom_host) {
1283                                         rprintf(FERROR,
1284                                                 "--files-from cannot be remote when the transfer is local\n");
1285                                         exit_cleanup(RERR_SYNTAX);
1286                                 }
1287                                 shell_machine = NULL;
1288                         } else { /* hostspec was found, so dest is remote */
1289                                 argv[argc] = path;
1290                                 if (rsync_port)
1291                                         daemon_over_rsh = shell_cmd ? 1 : -1;
1292                         }
1293                 }
1294         } else {  /* read_batch */
1295                 local_server = 1;
1296                 if (check_for_hostspec(argv[argc-1], &shell_machine, &rsync_port)) {
1297                         rprintf(FERROR, "remote destination is not allowed with --read-batch\n");
1298                         exit_cleanup(RERR_SYNTAX);
1299                 }
1300                 remote_argv = argv += argc - 1;
1301                 remote_argc = argc = 1;
1302         }
1303
1304         if (am_sender) {
1305                 char *dummy_host;
1306                 int dummy_port = rsync_port;
1307                 int i;
1308                 /* For local source, extra source args must not have hostspec. */
1309                 for (i = 1; i < argc; i++) {
1310                         if (check_for_hostspec(argv[i], &dummy_host, &dummy_port)) {
1311                                 rprintf(FERROR, "Unexpected remote arg: %s\n", argv[i]);
1312                                 exit_cleanup(RERR_SYNTAX);
1313                         }
1314                 }
1315         } else {
1316                 char *dummy_host;
1317                 int dummy_port = rsync_port;
1318                 int i;
1319                 /* For remote source, any extra source args must have either
1320                  * the same hostname or an empty hostname. */
1321                 for (i = 1; i < remote_argc; i++) {
1322                         char *arg = check_for_hostspec(remote_argv[i], &dummy_host, &dummy_port);
1323                         if (!arg) {
1324                                 rprintf(FERROR, "Unexpected local arg: %s\n", remote_argv[i]);
1325                                 rprintf(FERROR, "If arg is a remote file/dir, prefix it with a colon (:).\n");
1326                                 exit_cleanup(RERR_SYNTAX);
1327                         }
1328                         if (*dummy_host && strcmp(dummy_host, shell_machine) != 0) {
1329                                 rprintf(FERROR, "All source args must come from the same machine.\n");
1330                                 exit_cleanup(RERR_SYNTAX);
1331                         }
1332                         if (rsync_port != dummy_port) {
1333                                 if (!rsync_port || !dummy_port)
1334                                         rprintf(FERROR, "All source args must use the same hostspec format.\n");
1335                                 else
1336                                         rprintf(FERROR, "All source args must use the same port number.\n");
1337                                 exit_cleanup(RERR_SYNTAX);
1338                         }
1339                         remote_argv[i] = arg;
1340                 }
1341         }
1342
1343         if (daemon_over_rsh < 0)
1344                 return start_socket_client(shell_machine, remote_argc, remote_argv, argc, argv);
1345
1346         if (password_file && !daemon_over_rsh) {
1347                 rprintf(FERROR, "The --password-file option may only be "
1348                                 "used when accessing an rsync daemon.\n");
1349                 exit_cleanup(RERR_SYNTAX);
1350         }
1351
1352         if (connect_timeout) {
1353                 rprintf(FERROR, "The --contimeout option may only be "
1354                                 "used when connecting to an rsync daemon.\n");
1355                 exit_cleanup(RERR_SYNTAX);
1356         }
1357
1358         if (shell_machine) {
1359                 p = strrchr(shell_machine,'@');
1360                 if (p) {
1361                         *p = 0;
1362                         shell_user = shell_machine;
1363                         shell_machine = p+1;
1364                 }
1365         }
1366
1367         if (DEBUG_GTE(CMD, 2)) {
1368                 rprintf(FINFO,"cmd=%s machine=%s user=%s path=%s\n",
1369                         NS(shell_cmd), NS(shell_machine), NS(shell_user),
1370                         NS(remote_argv[0]));
1371         }
1372
1373         pid = do_cmd(shell_cmd, shell_machine, shell_user, remote_argv, remote_argc,
1374                      &f_in, &f_out);
1375
1376         /* if we're running an rsync server on the remote host over a
1377          * remote shell command, we need to do the RSYNCD protocol first */
1378         if (daemon_over_rsh) {
1379                 int tmpret;
1380                 tmpret = start_inband_exchange(f_in, f_out, shell_user, remote_argc, remote_argv);
1381                 if (tmpret < 0)
1382                         return tmpret;
1383         }
1384
1385         ret = client_run(f_in, f_out, pid, argc, argv);
1386
1387         fflush(stdout);
1388         fflush(stderr);
1389
1390         return ret;
1391 }
1392
1393
1394 static RETSIGTYPE sigusr1_handler(UNUSED(int val))
1395 {
1396         exit_cleanup(RERR_SIGNAL1);
1397 }
1398
1399 static RETSIGTYPE sigusr2_handler(UNUSED(int val))
1400 {
1401         if (!am_server)
1402                 output_summary();
1403         close_all();
1404         if (got_xfer_error)
1405                 _exit(RERR_PARTIAL);
1406         _exit(0);
1407 }
1408
1409 RETSIGTYPE remember_children(UNUSED(int val))
1410 {
1411 #ifdef WNOHANG
1412         int cnt, status;
1413         pid_t pid;
1414         /* An empty waitpid() loop was put here by Tridge and we could never
1415          * get him to explain why he put it in, so rather than taking it
1416          * out we're instead saving the child exit statuses for later use.
1417          * The waitpid() loop presumably eliminates all possibility of leaving
1418          * zombie children, maybe that's why he did it. */
1419         while ((pid = waitpid(-1, &status, WNOHANG)) > 0) {
1420                 /* save the child's exit status */
1421                 for (cnt = 0; cnt < MAXCHILDPROCS; cnt++) {
1422                         if (pid_stat_table[cnt].pid == 0) {
1423                                 pid_stat_table[cnt].pid = pid;
1424                                 pid_stat_table[cnt].status = status;
1425                                 break;
1426                         }
1427                 }
1428         }
1429 #endif
1430 #ifndef HAVE_SIGACTION
1431         signal(SIGCHLD, remember_children);
1432 #endif
1433 }
1434
1435
1436 /**
1437  * This routine catches signals and tries to send them to gdb.
1438  *
1439  * Because it's called from inside a signal handler it ought not to
1440  * use too many library routines.
1441  *
1442  * @todo Perhaps use "screen -X" instead/as well, to help people
1443  * debugging without easy access to X.  Perhaps use an environment
1444  * variable, or just call a script?
1445  *
1446  * @todo The /proc/ magic probably only works on Linux (and
1447  * Solaris?)  Can we be more portable?
1448  **/
1449 #ifdef MAINTAINER_MODE
1450 const char *get_panic_action(void)
1451 {
1452         const char *cmd_fmt = getenv("RSYNC_PANIC_ACTION");
1453
1454         if (cmd_fmt)
1455                 return cmd_fmt;
1456         else
1457                 return "xterm -display :0 -T Panic -n Panic "
1458                         "-e gdb /proc/%d/exe %d";
1459 }
1460
1461
1462 /**
1463  * Handle a fatal signal by launching a debugger, controlled by $RSYNC_PANIC_ACTION.
1464  *
1465  * This signal handler is only installed if we were configured with
1466  * --enable-maintainer-mode.  Perhaps it should always be on and we
1467  * should just look at the environment variable, but I'm a bit leery
1468  * of a signal sending us into a busy loop.
1469  **/
1470 static RETSIGTYPE rsync_panic_handler(UNUSED(int whatsig))
1471 {
1472         char cmd_buf[300];
1473         int ret;
1474
1475         snprintf(cmd_buf, sizeof cmd_buf, get_panic_action(),
1476                  getpid(), getpid());
1477
1478         /* Unless we failed to execute gdb, we allow the process to
1479          * continue.  I'm not sure if that's right. */
1480         ret = system(cmd_buf);
1481         if (ret)
1482                 _exit(ret);
1483 }
1484 #endif
1485
1486
1487 int main(int argc,char *argv[])
1488 {
1489         int ret;
1490         int orig_argc = argc;
1491         char **orig_argv = argv;
1492 #ifdef HAVE_SIGACTION
1493 # ifdef HAVE_SIGPROCMASK
1494         sigset_t sigmask;
1495
1496         sigemptyset(&sigmask);
1497 # endif
1498         sigact.sa_flags = SA_NOCLDSTOP;
1499 #endif
1500         SIGACTMASK(SIGUSR1, sigusr1_handler);
1501         SIGACTMASK(SIGUSR2, sigusr2_handler);
1502         SIGACTMASK(SIGCHLD, remember_children);
1503 #ifdef MAINTAINER_MODE
1504         SIGACTMASK(SIGSEGV, rsync_panic_handler);
1505         SIGACTMASK(SIGFPE, rsync_panic_handler);
1506         SIGACTMASK(SIGABRT, rsync_panic_handler);
1507         SIGACTMASK(SIGBUS, rsync_panic_handler);
1508 #endif
1509
1510         starttime = time(NULL);
1511         our_uid = MY_UID();
1512         our_gid = MY_GID();
1513         am_root = our_uid == 0;
1514
1515         memset(&stats, 0, sizeof(stats));
1516
1517         if (argc < 2) {
1518                 usage(FERROR);
1519                 exit_cleanup(RERR_SYNTAX);
1520         }
1521
1522         /* we set a 0 umask so that correct file permissions can be
1523          * carried across */
1524         orig_umask = umask(0);
1525
1526 #if defined CONFIG_LOCALE && defined HAVE_SETLOCALE
1527         setlocale(LC_CTYPE, "");
1528 #endif
1529
1530         if (!parse_arguments(&argc, (const char ***) &argv)) {
1531                 /* FIXME: We ought to call the same error-handling
1532                  * code here, rather than relying on getopt. */
1533                 option_error();
1534                 exit_cleanup(RERR_SYNTAX);
1535         }
1536
1537         SIGACTMASK(SIGINT, sig_int);
1538         SIGACTMASK(SIGHUP, sig_int);
1539         SIGACTMASK(SIGTERM, sig_int);
1540 #if defined HAVE_SIGACTION && HAVE_SIGPROCMASK
1541         sigprocmask(SIG_UNBLOCK, &sigmask, NULL);
1542 #endif
1543
1544         /* Ignore SIGPIPE; we consistently check error codes and will
1545          * see the EPIPE. */
1546         SIGACTION(SIGPIPE, SIG_IGN);
1547 #ifdef SIGXFSZ
1548         SIGACTION(SIGXFSZ, SIG_IGN);
1549 #endif
1550
1551         /* Initialize change_dir() here because on some old systems getcwd
1552          * (implemented by forking "pwd" and reading its output) doesn't
1553          * work when there are other child processes.  Also, on all systems
1554          * that implement getcwd that way "pwd" can't be found after chroot. */
1555         change_dir(NULL, CD_NORMAL);
1556
1557         init_flist();
1558
1559         if ((write_batch || read_batch) && !am_server) {
1560                 if (write_batch)
1561                         write_batch_shell_file(orig_argc, orig_argv, argc);
1562
1563                 if (read_batch && strcmp(batch_name, "-") == 0)
1564                         batch_fd = STDIN_FILENO;
1565                 else {
1566                         batch_fd = do_open(batch_name,
1567                                    write_batch ? O_WRONLY | O_CREAT | O_TRUNC
1568                                    : O_RDONLY, S_IRUSR | S_IWUSR);
1569                 }
1570                 if (batch_fd < 0) {
1571                         rsyserr(FERROR, errno, "Batch file %s open error",
1572                                 full_fname(batch_name));
1573                         exit_cleanup(RERR_FILEIO);
1574                 }
1575                 if (read_batch)
1576                         read_stream_flags(batch_fd);
1577                 else
1578                         write_stream_flags(batch_fd);
1579         }
1580         if (write_batch < 0)
1581                 dry_run = 1;
1582
1583         if (am_server) {
1584 #ifdef ICONV_CONST
1585                 setup_iconv();
1586 #endif
1587         } else if (am_daemon)
1588                 return daemon_main();
1589
1590         if (am_server && protect_args) {
1591                 char buf[MAXPATHLEN];
1592                 protect_args = 2;
1593                 read_args(STDIN_FILENO, NULL, buf, sizeof buf, 1, &argv, &argc, NULL);
1594                 if (!parse_arguments(&argc, (const char ***) &argv)) {
1595                         option_error();
1596                         exit_cleanup(RERR_SYNTAX);
1597                 }
1598         }
1599
1600         if (argc < 1) {
1601                 usage(FERROR);
1602                 exit_cleanup(RERR_SYNTAX);
1603         }
1604
1605         if (am_server) {
1606                 set_nonblocking(STDIN_FILENO);
1607                 set_nonblocking(STDOUT_FILENO);
1608                 if (am_daemon)
1609                         return start_daemon(STDIN_FILENO, STDOUT_FILENO);
1610                 start_server(STDIN_FILENO, STDOUT_FILENO, argc, argv);
1611         }
1612
1613         ret = start_client(argc, argv);
1614         if (ret == -1)
1615                 exit_cleanup(RERR_STARTCLIENT);
1616         else
1617                 exit_cleanup(ret);
1618
1619         return ret;
1620 }