main.c

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