main.c

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