main.c

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