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 we_send_keepalive_messages;
  77 extern BOOL flist_receiving_enabled;
  78 extern BOOL shutting_down;
  79 extern struct stats stats;
  80 extern char *stdout_format;
  81 extern char *logfile_format;
  82 extern char *filesfrom_host;
  83 extern char *partial_dir;
  84 extern char *dest_option;
  85 extern char *rsync_path;
  86 extern char *shell_cmd;
  87 extern char *batch_name;
  88 extern char *password_file;
  89 extern char *backup_dir;
  90 extern char curr_dir[MAXPATHLEN];
  91 extern char backup_dir_buf[MAXPATHLEN];
  92 extern char *basis_dir[MAX_BASIS_DIRS+1];
  93 extern struct file_list *first_flist;
  94 extern filter_rule_list daemon_filter_list;
  95
  96 uid_t our_uid;
  97 gid_t our_gid;
  98 int am_receiver = 0;  /* Only set to 1 after the receiver/generator fork. */
  99 int am_generator = 0; /* Only set to 1 after the receiver/generator fork. */
 100 int local_server = 0;
 101 int daemon_over_rsh = 0;
 102 mode_t orig_umask = 0;
 103 int batch_gen_fd = -1;
 104 int sender_keeps_checksum = 0;
 105
 106 /* There's probably never more than at most 2 outstanding child processes,
 107  * but set it higher, just in case. */
 108 #define MAXCHILDPROCS 7
 109
 110 #ifdef HAVE_SIGACTION
 111 # ifdef HAVE_SIGPROCMASK
 112 #  define SIGACTMASK(n,h) SIGACTION(n,h), sigaddset(&sigmask,(n))
 113 # else
 114 #  define SIGACTMASK(n,h) SIGACTION(n,h)
 115 # endif
 116 static struct sigaction sigact;
 117 #endif
 118
 119 struct pid_status {
 120         pid_t pid;
 121         int status;
 122 } pid_stat_table[MAXCHILDPROCS];
 123
 124 static time_t starttime, endtime;
 125 static int64 total_read, total_written;
 126
 127 static void show_malloc_stats(void);
 128
 129 /* Works like waitpid(), but if we already harvested the child pid in our
 130  * remember_children(), we succeed instead of returning an error. */
 131 pid_t wait_process(pid_t pid, int *status_ptr, int flags)
 132 {
 133         pid_t waited_pid;
 134
 135         do {
 136                 waited_pid = waitpid(pid, status_ptr, flags);
 137         } while (waited_pid == -1 && errno == EINTR);
 138
 139         if (waited_pid == -1 && errno == ECHILD) {
 140                 /* Status of requested child no longer available:  check to
 141                  * see if it was processed by remember_children(). */
 142                 int cnt;
 143                 for (cnt = 0; cnt < MAXCHILDPROCS; cnt++) {
 144                         if (pid == pid_stat_table[cnt].pid) {
 145                                 *status_ptr = pid_stat_table[cnt].status;
 146                                 pid_stat_table[cnt].pid = 0;
 147                                 return pid;
 148                         }
 149                 }
 150         }
 151
 152         return waited_pid;
 153 }
 154
 155 /* Wait for a process to exit, calling io_flush while waiting. */
 156 static void wait_process_with_flush(pid_t pid, int *exit_code_ptr)
 157 {
 158         pid_t waited_pid;
 159         int status;
 160
 161         while ((waited_pid = wait_process(pid, &status, WNOHANG)) == 0) {
 162                 msleep(20);
 163                 io_flush(FULL_FLUSH);
 164         }
 165
 166         /* TODO: If the child exited on a signal, then log an
 167          * appropriate error message.  Perhaps we should also accept a
 168          * message describing the purpose of the child.  Also indicate
 169          * this to the caller so that they know something went wrong. */
 170         if (waited_pid < 0) {
 171                 rsyserr(FERROR, errno, "waitpid");
 172                 *exit_code_ptr = RERR_WAITCHILD;
 173         } else if (!WIFEXITED(status)) {
 174 #ifdef WCOREDUMP
 175                 if (WCOREDUMP(status))
 176                         *exit_code_ptr = RERR_CRASHED;
 177                 else
 178 #endif
 179                 if (WIFSIGNALED(status))
 180                         *exit_code_ptr = RERR_TERMINATED;
 181                 else
 182                         *exit_code_ptr = RERR_WAITCHILD;
 183         } else
 184                 *exit_code_ptr = WEXITSTATUS(status);
 185 }
 186
 187 void write_del_stats(int f)
 188 {
 189         if (read_batch)
 190                 write_int(f, NDX_DEL_STATS);
 191         else
 192                 write_ndx(f, NDX_DEL_STATS);
 193         write_varint(f, stats.deleted_files - stats.deleted_dirs
 194                       - stats.deleted_symlinks - stats.deleted_devices
 195                       - stats.deleted_specials);
 196         write_varint(f, stats.deleted_dirs);
 197         write_varint(f, stats.deleted_symlinks);
 198         write_varint(f, stats.deleted_devices);
 199         write_varint(f, stats.deleted_specials);
 200 }
 201
 202 void read_del_stats(int f)
 203 {
 204         stats.deleted_files = read_varint(f);
 205         stats.deleted_files += stats.deleted_dirs = read_varint(f);
 206         stats.deleted_files += stats.deleted_symlinks = read_varint(f);
 207         stats.deleted_files += stats.deleted_devices = read_varint(f);
 208         stats.deleted_files += stats.deleted_specials = read_varint(f);
 209 }
 210
 211 /* This function gets called from all 3 processes.  We want the client side
 212  * to actually output the text, but the sender is the only process that has
 213  * all the stats we need.  So, if we're a client sender, we do the report.
 214  * If we're a server sender, we write the stats on the supplied fd.  If
 215  * we're the client receiver we read the stats from the supplied fd and do
 216  * the report.  All processes might also generate a set of debug stats, if
 217  * the verbose level is high enough (this is the only thing that the
 218  * generator process and the server receiver ever do here). */
 219 static void handle_stats(int f)
 220 {
 221         endtime = time(NULL);
 222
 223         /* Cache two stats because the read/write code can change it. */
 224         total_read = stats.total_read;
 225         total_written = stats.total_written;
 226
 227         if (INFO_GTE(STATS, 3)) {
 228                 /* These come out from every process */
 229                 show_malloc_stats();
 230                 show_flist_stats();
 231         }
 232
 233         if (am_generator)
 234                 return;
 235
 236         if (am_daemon) {
 237                 if (f == -1 || !am_sender)
 238                         return;
 239         }
 240
 241         if (am_server) {
 242                 if (am_sender) {
 243                         write_varlong30(f, total_read, 3);
 244                         write_varlong30(f, total_written, 3);
 245                         write_varlong30(f, stats.total_size, 3);
 246                         if (protocol_version >= 29) {
 247                                 write_varlong30(f, stats.flist_buildtime, 3);
 248                                 write_varlong30(f, stats.flist_xfertime, 3);
 249                         }
 250                 }
 251                 return;
 252         }
 253
 254         /* this is the client */
 255
 256         if (f < 0 && !am_sender) /* e.g. when we got an empty file list. */
 257                 ;
 258         else if (!am_sender) {
 259                 /* Read the first two in opposite order because the meaning of
 260                  * read/write swaps when switching from sender to receiver. */
 261                 total_written = read_varlong30(f, 3);
 262                 total_read = read_varlong30(f, 3);
 263                 stats.total_size = read_varlong30(f, 3);
 264                 if (protocol_version >= 29) {
 265                         stats.flist_buildtime = read_varlong30(f, 3);
 266                         stats.flist_xfertime = read_varlong30(f, 3);
 267                 }
 268         } else if (write_batch) {
 269                 /* The --read-batch process is going to be a client
 270                  * receiver, so we need to give it the stats. */
 271                 write_varlong30(batch_fd, total_read, 3);
 272                 write_varlong30(batch_fd, total_written, 3);
 273                 write_varlong30(batch_fd, stats.total_size, 3);
 274                 if (protocol_version >= 29) {
 275                         write_varlong30(batch_fd, stats.flist_buildtime, 3);
 276                         write_varlong30(batch_fd, stats.flist_xfertime, 3);
 277                 }
 278         }
 279 }
 280
 281 static void output_itemized_counts(const char *prefix, int *counts)
 282 {
 283         static char *labels[] = { "reg", "dir", "link", "dev", "special" };
 284         char buf[1024], *pre = " (";
 285         int j, len = 0;
 286         int total = counts[0];
 287         if (total) {
 288                 counts[0] -= counts[1] + counts[2] + counts[3] + counts[4];
 289                 for (j = 0; j < 5; j++) {
 290                         if (counts[j]) {
 291                                 len += snprintf(buf+len, sizeof buf - len - 2,
 292                                         "%s%s: %s",
 293                                         pre, labels[j], comma_num(counts[j]));
 294                                 pre = ", ";
 295                         }
 296                 }
 297                 buf[len++] = ')';
 298         }
 299         buf[len] = '\0';
 300         rprintf(FINFO, "%s: %s%s\n", prefix, comma_num(total), buf);
 301 }
 302
 303 static void output_summary(void)
 304 {
 305         if (INFO_GTE(STATS, 2)) {
 306                 rprintf(FCLIENT, "\n");
 307                 output_itemized_counts("Number of files", &stats.num_files);
 308                 if (protocol_version >= 29)
 309                         output_itemized_counts("Number of created files", &stats.created_files);
 310                 if (protocol_version >= 31)
 311                         output_itemized_counts("Number of deleted files", &stats.deleted_files);
 312                 rprintf(FINFO,"Number of regular files transferred: %s\n",
 313                         comma_num(stats.xferred_files));
 314                 rprintf(FINFO,"Total file size: %s bytes\n",
 315                         human_num(stats.total_size));
 316                 rprintf(FINFO,"Total transferred file size: %s bytes\n",
 317                         human_num(stats.total_transferred_size));
 318                 rprintf(FINFO,"Literal data: %s bytes\n",
 319                         human_num(stats.literal_data));
 320                 rprintf(FINFO,"Matched data: %s bytes\n",
 321                         human_num(stats.matched_data));
 322                 rprintf(FINFO,"File list size: %s\n",
 323                         human_num(stats.flist_size));
 324                 if (stats.flist_buildtime) {
 325                         rprintf(FINFO,
 326                                 "File list generation time: %s seconds\n",
 327                                 comma_dnum((double)stats.flist_buildtime / 1000, 3));
 328                         rprintf(FINFO,
 329                                 "File list transfer time: %s seconds\n",
 330                                 comma_dnum((double)stats.flist_xfertime / 1000, 3));
 331                 }
 332                 rprintf(FINFO,"Total bytes sent: %s\n",
 333                         human_num(total_written));
 334                 rprintf(FINFO,"Total bytes received: %s\n",
 335                         human_num(total_read));
 336         }
 337
 338         if (INFO_GTE(STATS, 1)) {
 339                 rprintf(FCLIENT, "\n");
 340                 rprintf(FINFO,
 341                         "sent %s bytes  received %s bytes  %s bytes/sec\n",
 342                         human_num(total_written), human_num(total_read),
 343                         human_dnum((total_written + total_read)/(0.5 + (endtime - starttime)), 2));
 344                 rprintf(FINFO, "total size is %s  speedup is %s%s\n",
 345                         human_num(stats.total_size),
 346                         comma_dnum((double)stats.total_size / (total_written+total_read), 2),
 347                         write_batch < 0 ? " (BATCH ONLY)" : dry_run ? " (DRY RUN)" : "");
 348         }
 349
 350         fflush(stdout);
 351         fflush(stderr);
 352 }
 353
 354
 355 /**
 356  * If our C library can get malloc statistics, then show them to FINFO
 357  **/
 358 static void show_malloc_stats(void)
 359 {
 360 #ifdef HAVE_MALLINFO
 361         struct mallinfo mi;
 362
 363         mi = mallinfo();
 364
 365         rprintf(FCLIENT, "\n");
 366         rprintf(FINFO, RSYNC_NAME "[%d] (%s%s%s) heap statistics:\n",
 367                 getpid(), am_server ? "server " : "",
 368                 am_daemon ? "daemon " : "", who_am_i());
 369         rprintf(FINFO, "  arena:     %10ld   (bytes from sbrk)\n",
 370                 (long)mi.arena);
 371         rprintf(FINFO, "  ordblks:   %10ld   (chunks not in use)\n",
 372                 (long)mi.ordblks);
 373         rprintf(FINFO, "  smblks:    %10ld\n",
 374                 (long)mi.smblks);
 375         rprintf(FINFO, "  hblks:     %10ld   (chunks from mmap)\n",
 376                 (long)mi.hblks);
 377         rprintf(FINFO, "  hblkhd:    %10ld   (bytes from mmap)\n",
 378                 (long)mi.hblkhd);
 379         rprintf(FINFO, "  allmem:    %10ld   (bytes from sbrk + mmap)\n",
 380                 (long)mi.arena + mi.hblkhd);
 381         rprintf(FINFO, "  usmblks:   %10ld\n",
 382                 (long)mi.usmblks);
 383         rprintf(FINFO, "  fsmblks:   %10ld\n",
 384                 (long)mi.fsmblks);
 385         rprintf(FINFO, "  uordblks:  %10ld   (bytes used)\n",
 386                 (long)mi.uordblks);
 387         rprintf(FINFO, "  fordblks:  %10ld   (bytes free)\n",
 388                 (long)mi.fordblks);
 389         rprintf(FINFO, "  keepcost:  %10ld   (bytes in releasable chunk)\n",
 390                 (long)mi.keepcost);
 391 #endif /* HAVE_MALLINFO */
 392 }
 393
 394
 395 /* Start the remote shell.   cmd may be NULL to use the default. */
 396 static pid_t do_cmd(char *cmd, char *machine, char *user, char **remote_argv, int remote_argc,
 397                     int *f_in_p, int *f_out_p)
 398 {
 399         int i, argc = 0;
 400         char *args[MAX_ARGS], *need_to_free = NULL;
 401         pid_t pid;
 402         int dash_l_set = 0;
 403
 404         if (!read_batch && !local_server) {
 405                 char *t, *f, in_quote = '\0';
 406                 char *rsh_env = getenv(RSYNC_RSH_ENV);
 407                 if (!cmd)
 408                         cmd = rsh_env;
 409                 if (!cmd)
 410                         cmd = RSYNC_RSH;
 411                 cmd = need_to_free = strdup(cmd);
 412                 if (!cmd)
 413                         goto oom;
 414
 415                 for (t = f = cmd; *f; f++) {
 416                         if (*f == ' ')
 417                                 continue;
 418                         /* Comparison leaves rooms for server_options(). */
 419                         if (argc >= MAX_ARGS - MAX_SERVER_ARGS)
 420                                 goto arg_overflow;
 421                         args[argc++] = t;
 422                         while (*f != ' ' || in_quote) {
 423                                 if (!*f) {
 424                                         if (in_quote) {
 425                                                 rprintf(FERROR,
 426                                                     "Missing trailing-%c in remote-shell command.\n",
 427                                                     in_quote);
 428                                                 exit_cleanup(RERR_SYNTAX);
 429                                         }
 430                                         f--;
 431                                         break;
 432                                 }
 433                                 if (*f == '\'' || *f == '"') {
 434                                         if (!in_quote) {
 435                                                 in_quote = *f++;
 436                                                 continue;
 437                                         }
 438                                         if (*f == in_quote && *++f != in_quote) {
 439                                                 in_quote = '\0';
 440                                                 continue;
 441                                         }
 442                                 }
 443                                 *t++ = *f++;
 444                         }
 445                         *t++ = '\0';
 446                 }
 447
 448                 /* check to see if we've already been given '-l user' in
 449                  * the remote-shell command */
 450                 for (i = 0; i < argc-1; i++) {
 451                         if (!strcmp(args[i], "-l") && args[i+1][0] != '-')
 452                                 dash_l_set = 1;
 453                 }
 454
 455 #ifdef HAVE_REMSH
 456                 /* remsh (on HPUX) takes the arguments the other way around */
 457                 args[argc++] = machine;
 458                 if (user && !(daemon_over_rsh && dash_l_set)) {
 459                         args[argc++] = "-l";
 460                         args[argc++] = user;
 461                 }
 462 #else
 463                 if (user && !(daemon_over_rsh && dash_l_set)) {
 464                         args[argc++] = "-l";
 465                         args[argc++] = user;
 466                 }
 467                 args[argc++] = machine;
 468 #endif
 469
 470                 args[argc++] = rsync_path;
 471
 472                 if (blocking_io < 0) {
 473                         char *cp;
 474                         if ((cp = strrchr(cmd, '/')) != NULL)
 475                                 cp++;
 476                         else
 477                                 cp = cmd;
 478                         if (strcmp(cp, "rsh") == 0 || strcmp(cp, "remsh") == 0)
 479                                 blocking_io = 1;
 480                 }
 481
 482                 server_options(args,&argc);
 483
 484                 if (argc >= MAX_ARGS - 2)
 485                         goto arg_overflow;
 486         }
 487
 488         args[argc++] = ".";
 489
 490         if (!daemon_over_rsh) {
 491                 while (remote_argc > 0) {
 492                         if (argc >= MAX_ARGS - 1) {
 493                           arg_overflow:
 494                                 rprintf(FERROR, "internal: args[] overflowed in do_cmd()\n");
 495                                 exit_cleanup(RERR_SYNTAX);
 496                         }
 497                         args[argc++] = *remote_argv++;
 498                         remote_argc--;
 499                 }
 500         }
 501
 502         args[argc] = NULL;
 503
 504         if (DEBUG_GTE(CMD, 2)) {
 505                 for (i = 0; i < argc; i++)
 506                         rprintf(FCLIENT, "cmd[%d]=%s ", i, args[i]);
 507                 rprintf(FCLIENT, "\n");
 508         }
 509
 510         if (read_batch) {
 511                 int from_gen_pipe[2];
 512                 set_allow_inc_recurse();
 513                 if (fd_pair(from_gen_pipe) < 0) {
 514                         rsyserr(FERROR, errno, "pipe");
 515                         exit_cleanup(RERR_IPC);
 516                 }
 517                 batch_gen_fd = from_gen_pipe[0];
 518                 *f_out_p = from_gen_pipe[1];
 519                 *f_in_p = batch_fd;
 520                 pid = (pid_t)-1; /* no child pid */
 521 #ifdef ICONV_CONST
 522                 setup_iconv();
 523 #endif
 524         } else if (local_server) {
 525                 /* If the user didn't request --[no-]whole-file, force
 526                  * it on, but only if we're not batch processing. */
 527                 if (whole_file < 0 && !write_batch)
 528                         whole_file = 1;
 529                 set_allow_inc_recurse();
 530                 pid = local_child(argc, args, f_in_p, f_out_p, child_main);
 531 #ifdef ICONV_CONST
 532                 setup_iconv();
 533 #endif
 534         } else {
 535                 pid = piped_child(args, f_in_p, f_out_p);
 536 #ifdef ICONV_CONST
 537                 setup_iconv();
 538 #endif
 539                 if (protect_args && !daemon_over_rsh)
 540                         send_protected_args(*f_out_p, args);
 541         }
 542
 543         if (need_to_free)
 544                 free(need_to_free);
 545
 546         return pid;
 547
 548   oom:
 549         out_of_memory("do_cmd");
 550         return 0; /* not reached */
 551 }
 552
 553 /* The receiving side operates in one of two modes:
 554  *
 555  * 1. it receives any number of files into a destination directory,
 556  * placing them according to their names in the file-list.
 557  *
 558  * 2. it receives a single file and saves it using the name in the
 559  * destination path instead of its file-list name.  This requires a
 560  * "local name" for writing out the destination file.
 561  *
 562  * So, our task is to figure out what mode/local-name we need.
 563  * For mode 1, we change into the destination directory and return NULL.
 564  * For mode 2, we change into the directory containing the destination
 565  * file (if we aren't already there) and return the local-name. */
 566 static char *get_local_name(struct file_list *flist, char *dest_path)
 567 {
 568         STRUCT_STAT st;
 569         int statret;
 570         char *cp;
 571
 572         if (DEBUG_GTE(RECV, 1)) {
 573                 rprintf(FINFO, "get_local_name count=%d %s\n",
 574                         file_total, NS(dest_path));
 575         }
 576
 577         if (!dest_path || list_only)
 578                 return NULL;
 579
 580         if (daemon_filter_list.head) {
 581                 char *slash = strrchr(dest_path, '/');
 582                 if (slash && (slash[1] == '\0' || (slash[1] == '.' && slash[2] == '\0')))
 583                         *slash = '\0';
 584                 else
 585                         slash = NULL;
 586                 if ((*dest_path != '.' || dest_path[1] != '\0')
 587                  && (check_filter(&daemon_filter_list, FLOG, dest_path, 0) < 0
 588                   || check_filter(&daemon_filter_list, FLOG, dest_path, 1) < 0)) {
 589                         rprintf(FERROR, "skipping daemon-excluded destination \"%s\"\n",
 590                                 dest_path);
 591                         exit_cleanup(RERR_FILESELECT);
 592                 }
 593                 if (slash)
 594                         *slash = '/';
 595         }
 596
 597         /* See what currently exists at the destination. */
 598         if ((statret = do_stat(dest_path, &st)) == 0) {
 599                 /* If the destination is a dir, enter it and use mode 1. */
 600                 if (S_ISDIR(st.st_mode)) {
 601                         if (!change_dir(dest_path, CD_NORMAL)) {
 602                                 rsyserr(FERROR, errno, "change_dir#1 %s failed",
 603                                         full_fname(dest_path));
 604                                 exit_cleanup(RERR_FILESELECT);
 605                         }
 606                         return NULL;
 607                 }
 608                 if (file_total > 1) {
 609                         rprintf(FERROR,
 610                                 "ERROR: destination must be a directory when"
 611                                 " copying more than 1 file\n");
 612                         exit_cleanup(RERR_FILESELECT);
 613                 }
 614                 if (file_total == 1 && S_ISDIR(flist->files[0]->mode)) {
 615                         rprintf(FERROR,
 616                                 "ERROR: cannot overwrite non-directory"
 617                                 " with a directory\n");
 618                         exit_cleanup(RERR_FILESELECT);
 619                 }
 620         } else if (errno != ENOENT) {
 621                 /* If we don't know what's at the destination, fail. */
 622                 rsyserr(FERROR, errno, "ERROR: cannot stat destination %s",
 623                         full_fname(dest_path));
 624                 exit_cleanup(RERR_FILESELECT);
 625         }
 626
 627         cp = strrchr(dest_path, '/');
 628
 629         /* If we need a destination directory because the transfer is not
 630          * of a single non-directory or the user has requested one via a
 631          * destination path ending in a slash, create one and use mode 1. */
 632         if (file_total > 1 || (cp && !cp[1])) {
 633                 /* Lop off the final slash (if any). */
 634                 if (cp && !cp[1])
 635                         *cp = '\0';
 636
 637                 if (statret == 0) {
 638                         rprintf(FERROR,
 639                             "ERROR: destination path is not a directory\n");
 640                         exit_cleanup(RERR_SYNTAX);
 641                 }
 642
 643                 if (mkdir_defmode(dest_path) != 0) {
 644                         rsyserr(FERROR, errno, "mkdir %s failed",
 645                                 full_fname(dest_path));
 646                         exit_cleanup(RERR_FILEIO);
 647                 }
 648
 649                 if (flist->high >= flist->low
 650                  && strcmp(flist->files[flist->low]->basename, ".") == 0)
 651                         flist->files[0]->flags |= FLAG_DIR_CREATED;
 652
 653                 if (INFO_GTE(NAME, 1))
 654                         rprintf(FINFO, "created directory %s\n", dest_path);
 655
 656                 if (dry_run) {
 657                         /* Indicate that dest dir doesn't really exist. */
 658                         dry_run++;
 659                 }
 660
 661                 if (!change_dir(dest_path, dry_run > 1 ? CD_SKIP_CHDIR : CD_NORMAL)) {
 662                         rsyserr(FERROR, errno, "change_dir#2 %s failed",
 663                                 full_fname(dest_path));
 664                         exit_cleanup(RERR_FILESELECT);
 665                 }
 666
 667                 return NULL;
 668         }
 669
 670         /* Otherwise, we are writing a single file, possibly on top of an
 671          * existing non-directory.  Change to the item's parent directory
 672          * (if it has a path component), return the basename of the
 673          * destination file as the local name, and use mode 2. */
 674         if (!cp)
 675                 return dest_path;
 676
 677         if (cp == dest_path)
 678                 dest_path = "/";
 679
 680         *cp = '\0';
 681         if (!change_dir(dest_path, CD_NORMAL)) {
 682                 rsyserr(FERROR, errno, "change_dir#3 %s failed",
 683                         full_fname(dest_path));
 684                 exit_cleanup(RERR_FILESELECT);
 685         }
 686         *cp = '/';
 687
 688         return cp + 1;
 689 }
 690
 691 /* This function checks on our alternate-basis directories.  If we're in
 692  * dry-run mode and the destination dir does not yet exist, we'll try to
 693  * tweak any dest-relative paths to make them work for a dry-run (the
 694  * destination dir must be in curr_dir[] when this function is called).
 695  * We also warn about any arg that is non-existent or not a directory. */
 696 static void check_alt_basis_dirs(void)
 697 {
 698         STRUCT_STAT st;
 699         char **dir_p, *slash = strrchr(curr_dir, '/');
 700
 701         for (dir_p = basis_dir; *dir_p; dir_p++) {
 702                 if (dry_run > 1 && **dir_p != '/') {
 703                         int len = curr_dir_len + 1 + strlen(*dir_p) + 1;
 704                         char *new = new_array(char, len);
 705                         if (!new)
 706                                 out_of_memory("check_alt_basis_dirs");
 707                         if (slash && strncmp(*dir_p, "../", 3) == 0) {
 708                             /* We want to remove only one leading "../" prefix for
 709                              * the directory we couldn't create in dry-run mode:
 710                              * this ensures that any other ".." references get
 711                              * evaluated the same as they would for a live copy. */
 712                             *slash = '\0';
 713                             pathjoin(new, len, curr_dir, *dir_p + 3);
 714                             *slash = '/';
 715                         } else
 716                             pathjoin(new, len, curr_dir, *dir_p);
 717                         *dir_p = new;
 718                 }
 719                 if (do_stat(*dir_p, &st) < 0) {
 720                         rprintf(FWARNING, "%s arg does not exist: %s\n",
 721                                 dest_option, *dir_p);
 722                 } else if (!S_ISDIR(st.st_mode)) {
 723                         rprintf(FWARNING, "%s arg is not a dir: %s\n",
 724                                 dest_option, *dir_p);
 725                 }
 726         }
 727 }
 728
 729 /* This is only called by the sender. */
 730 static void read_final_goodbye(int f_in, int f_out)
 731 {
 732         int i, iflags, xlen;
 733         uchar fnamecmp_type;
 734         char xname[MAXPATHLEN];
 735
 736         shutting_down = True;
 737
 738         if (protocol_version < 29)
 739                 i = read_int(f_in);
 740         else {
 741                 i = read_ndx_and_attrs(f_in, f_out, &iflags, &fnamecmp_type, xname, &xlen);
 742                 if (protocol_version >= 31 && i == NDX_DONE) {
 743                         if (am_sender)
 744                                 write_ndx(f_out, NDX_DONE);
 745                         else {
 746                                 if (batch_gen_fd >= 0) {
 747                                         while (read_int(batch_gen_fd) != NDX_DEL_STATS) {}
 748                                         read_del_stats(batch_gen_fd);
 749                                 }
 750                                 write_int(f_out, NDX_DONE);
 751                         }
 752                         i = read_ndx_and_attrs(f_in, f_out, &iflags, &fnamecmp_type, xname, &xlen);
 753                 }
 754         }
 755
 756         if (i != NDX_DONE) {
 757                 rprintf(FERROR, "Invalid packet at end of run (%d) [%s]\n",
 758                         i, who_am_i());
 759                 exit_cleanup(RERR_PROTOCOL);
 760         }
 761 }
 762
 763 static void do_server_sender(int f_in, int f_out, int argc, char *argv[])
 764 {
 765         struct file_list *flist;
 766         char *dir = argv[0];
 767
 768         we_send_keepalive_messages = io_timeout != 0 && protocol_version < 31;
 769
 770         if (DEBUG_GTE(SEND, 1)) {
 771                 rprintf(FINFO, "server_sender starting pid=%ld\n",
 772                         (long)getpid());
 773         }
 774
 775         if (am_daemon && lp_write_only(module_id)) {
 776                 rprintf(FERROR, "ERROR: module is write only\n");
 777                 exit_cleanup(RERR_SYNTAX);
 778                 return;
 779         }
 780         if (am_daemon && read_only && remove_source_files) {
 781                 rprintf(FERROR,
 782                     "ERROR: --remove-%s-files cannot be used with a read-only module\n",
 783                     remove_source_files == 1 ? "source" : "sent");
 784                 exit_cleanup(RERR_SYNTAX);
 785                 return;
 786         }
 787
 788         if (!relative_paths) {
 789                 if (!change_dir(dir, CD_NORMAL)) {
 790                         rsyserr(FERROR, errno, "change_dir#3 %s failed",
 791                                 full_fname(dir));
 792                         exit_cleanup(RERR_FILESELECT);
 793                 }
 794         }
 795         argc--;
 796         argv++;
 797
 798         if (argc == 0 && (recurse || xfer_dirs || list_only)) {
 799                 argc = 1;
 800                 argv--;
 801                 argv[0] = ".";
 802         }
 803
 804         flist = send_file_list(f_out,argc,argv);
 805         if (!flist || flist->used == 0)
 806                 exit_cleanup(0);
 807
 808         io_start_buffering_in(f_in);
 809
 810         send_files(f_in, f_out);
 811         io_flush(FULL_FLUSH);
 812         handle_stats(f_out);
 813         if (protocol_version >= 24)
 814                 read_final_goodbye(f_in, f_out);
 815         io_flush(FULL_FLUSH);
 816         exit_cleanup(0);
 817 }
 818
 819
 820 static int do_recv(int f_in, int f_out, char *local_name)
 821 {
 822         int pid;
 823         int exit_code = 0;
 824         int error_pipe[2];
 825
 826         /* The receiving side mustn't obey this, or an existing symlink that
 827          * points to an identical file won't be replaced by the referent. */
 828         copy_links = copy_dirlinks = copy_unsafe_links = 0;
 829
 830 #ifdef SUPPORT_HARD_LINKS
 831         if (preserve_hard_links && !inc_recurse)
 832                 match_hard_links(first_flist);
 833 #endif
 834
 835         if (fd_pair(error_pipe) < 0) {
 836                 rsyserr(FERROR, errno, "pipe failed in do_recv");
 837                 exit_cleanup(RERR_IPC);
 838         }
 839
 840         if (backup_dir) {
 841                 int ret = make_path(backup_dir_buf, MKP_DROP_NAME); /* drops trailing slash */
 842                 if (ret < 0)
 843                         exit_cleanup(RERR_SYNTAX);
 844                 if (ret)
 845                         rprintf(FINFO, "Created backup_dir %s\n", backup_dir_buf);
 846                 else if (INFO_GTE(BACKUP, 1))
 847                         rprintf(FINFO, "backup_dir is %s\n", backup_dir_buf);
 848         }
 849
 850         io_flush(FULL_FLUSH);
 851
 852         if ((pid = do_fork()) == -1) {
 853                 rsyserr(FERROR, errno, "fork failed in do_recv");
 854                 exit_cleanup(RERR_IPC);
 855         }
 856
 857         if (pid == 0) {
 858                 am_receiver = 1;
 859                 send_msgs_to_gen = am_server;
 860
 861                 close(error_pipe[0]);
 862
 863                 /* We can't let two processes write to the socket at one time. */
 864                 io_end_multiplex_out(MPLX_SWITCHING);
 865                 if (f_in != f_out)
 866                         close(f_out);
 867                 sock_f_out = -1;
 868                 f_out = error_pipe[1];
 869
 870                 bwlimit_writemax = 0; /* receiver doesn't need to do this */
 871
 872                 if (read_batch)
 873                         io_start_buffering_in(f_in);
 874                 io_start_multiplex_out(f_out);
 875
 876                 recv_files(f_in, f_out, local_name);
 877                 io_flush(FULL_FLUSH);
 878                 handle_stats(f_in);
 879
 880                 if (output_needs_newline) {
 881                         fputc('\n', stdout);
 882                         output_needs_newline = 0;
 883                 }
 884
 885                 write_int(f_out, NDX_DONE);
 886                 send_msg(MSG_STATS, (char*)&stats.total_read, sizeof stats.total_read, 0);
 887                 io_flush(FULL_FLUSH);
 888
 889                 /* Handle any keep-alive packets from the post-processing work
 890                  * that the generator does. */
 891                 if (protocol_version >= 29) {
 892                         kluge_around_eof = -1;
 893
 894                         /* This should only get stopped via a USR2 signal. */
 895                         read_final_goodbye(f_in, f_out);
 896
 897                         rprintf(FERROR, "Invalid packet at end of run [%s]\n",
 898                                 who_am_i());
 899                         exit_cleanup(RERR_PROTOCOL);
 900                 }
 901
 902                 /* Finally, we go to sleep until our parent kills us with a
 903                  * USR2 signal.  We sleep for a short time, as on some OSes
 904                  * a signal won't interrupt a sleep! */
 905                 while (1)
 906                         msleep(20);
 907         }
 908
 909         am_generator = 1;
 910         we_send_keepalive_messages = io_timeout != 0;
 911         flist_receiving_enabled = True;
 912
 913         io_end_multiplex_in(MPLX_SWITCHING);
 914         if (write_batch && !am_server)
 915                 stop_write_batch();
 916
 917         close(error_pipe[1]);
 918         if (f_in != f_out)
 919                 close(f_in);
 920         sock_f_in = -1;
 921         f_in = error_pipe[0];
 922
 923         io_start_buffering_out(f_out);
 924         io_start_multiplex_in(f_in);
 925
 926 #ifdef SUPPORT_HARD_LINKS
 927         if (preserve_hard_links && inc_recurse) {
 928                 struct file_list *flist;
 929                 for (flist = first_flist; flist; flist = flist->next)
 930                         match_hard_links(flist);
 931         }
 932 #endif
 933
 934         generate_files(f_out, local_name);
 935
 936         handle_stats(-1);
 937         io_flush(FULL_FLUSH);
 938         shutting_down = True;
 939         if (protocol_version >= 24) {
 940                 /* send a final goodbye message */
 941                 write_ndx(f_out, NDX_DONE);
 942         }
 943         io_flush(FULL_FLUSH);
 944
 945         kill(pid, SIGUSR2);
 946         wait_process_with_flush(pid, &exit_code);
 947         return exit_code;
 948 }
 949
 950 static void do_server_recv(int f_in, int f_out, int argc, char *argv[])
 951 {
 952         int exit_code;
 953         struct file_list *flist;
 954         char *local_name = NULL;
 955         int negated_levels;
 956
 957         if (filesfrom_fd >= 0 && !msgs2stderr && protocol_version < 31) {
 958                 /* We can't mix messages with files-from data on the socket,
 959                  * so temporarily turn off info/debug messages. */
 960                 negate_output_levels();
 961                 negated_levels = 1;
 962         } else
 963                 negated_levels = 0;
 964
 965         if (DEBUG_GTE(RECV, 1)) {
 966                 rprintf(FINFO, "server_recv(%d) starting pid=%ld\n",
 967                         argc, (long)getpid());
 968         }
 969
 970         if (am_daemon && read_only) {
 971                 rprintf(FERROR,"ERROR: module is read only\n");
 972                 exit_cleanup(RERR_SYNTAX);
 973                 return;
 974         }
 975
 976         if (argc > 0) {
 977                 char *dir = argv[0];
 978                 argc--;
 979                 argv++;
 980                 if (!am_daemon && !change_dir(dir, CD_NORMAL)) {
 981                         rsyserr(FERROR, errno, "change_dir#4 %s failed",
 982                                 full_fname(dir));
 983                         exit_cleanup(RERR_FILESELECT);
 984                 }
 985         }
 986
 987         if (protocol_version >= 30)
 988                 io_start_multiplex_in(f_in);
 989         else
 990                 io_start_buffering_in(f_in);
 991         recv_filter_list(f_in);
 992
 993         if (filesfrom_fd >= 0) {
 994                 /* We need to send the files-from names to the sender at the
 995                  * same time that we receive the file-list from them, so we
 996                  * need the IO routines to automatically write out the names
 997                  * onto our f_out socket as we read the file-list.  This
 998                  * avoids both deadlock and extra delays/buffers. */
 999                 start_filesfrom_forwarding(filesfrom_fd);
1000                 filesfrom_fd = -1;
1001         }
1002
1003         flist = recv_file_list(f_in);
1004         if (!flist) {
1005                 rprintf(FERROR,"server_recv: recv_file_list error\n");
1006                 exit_cleanup(RERR_FILESELECT);
1007         }
1008         if (inc_recurse && file_total == 1)
1009                 recv_additional_file_list(f_in);
1010
1011         if (negated_levels)
1012                 negate_output_levels();
1013
1014         if (argc > 0)
1015                 local_name = get_local_name(flist,argv[0]);
1016
1017         /* Now that we know what our destination directory turned out to be,
1018          * we can sanitize the --link-/copy-/compare-dest args correctly. */
1019         if (sanitize_paths) {
1020                 char **dir_p;
1021                 for (dir_p = basis_dir; *dir_p; dir_p++)
1022                         *dir_p = sanitize_path(NULL, *dir_p, NULL, curr_dir_depth, SP_DEFAULT);
1023                 if (partial_dir)
1024                         partial_dir = sanitize_path(NULL, partial_dir, NULL, curr_dir_depth, SP_DEFAULT);
1025         }
1026         check_alt_basis_dirs();
1027
1028         if (daemon_filter_list.head) {
1029                 char **dir_p;
1030                 filter_rule_list *elp = &daemon_filter_list;
1031
1032                 for (dir_p = basis_dir; *dir_p; dir_p++) {
1033                         char *dir = *dir_p;
1034                         if (*dir == '/')
1035                                 dir += module_dirlen;
1036                         if (check_filter(elp, FLOG, dir, 1) < 0)
1037                                 goto options_rejected;
1038                 }
1039                 if (partial_dir && *partial_dir == '/'
1040                  && check_filter(elp, FLOG, partial_dir + module_dirlen, 1) < 0) {
1041                     options_rejected:
1042                         rprintf(FERROR,
1043                                 "Your options have been rejected by the server.\n");
1044                         exit_cleanup(RERR_SYNTAX);
1045                 }
1046         }
1047
1048         exit_code = do_recv(f_in, f_out, local_name);
1049         exit_cleanup(exit_code);
1050 }
1051
1052
1053 int child_main(int argc, char *argv[])
1054 {
1055         start_server(STDIN_FILENO, STDOUT_FILENO, argc, argv);
1056         return 0;
1057 }
1058
1059
1060 void start_server(int f_in, int f_out, int argc, char *argv[])
1061 {
1062         set_nonblocking(f_in);
1063         set_nonblocking(f_out);
1064
1065         io_set_sock_fds(f_in, f_out);
1066         setup_protocol(f_out, f_in);
1067
1068         if (protocol_version >= 23)
1069                 io_start_multiplex_out(f_out);
1070         if (am_daemon && io_timeout && protocol_version >= 31)
1071                 send_msg_int(MSG_IO_TIMEOUT, io_timeout);
1072
1073         if (am_sender) {
1074                 keep_dirlinks = 0; /* Must be disabled on the sender. */
1075                 if (need_messages_from_generator)
1076                         io_start_multiplex_in(f_in);
1077                 else
1078                         io_start_buffering_in(f_in);
1079                 recv_filter_list(f_in);
1080                 do_server_sender(f_in, f_out, argc, argv);
1081         } else
1082                 do_server_recv(f_in, f_out, argc, argv);
1083         exit_cleanup(0);
1084 }
1085
1086 /* This is called once the connection has been negotiated.  It is used
1087  * for rsyncd, remote-shell, and local connections. */
1088 int client_run(int f_in, int f_out, pid_t pid, int argc, char *argv[])
1089 {
1090         struct file_list *flist = NULL;
1091         int exit_code = 0, exit_code2 = 0;
1092         char *local_name = NULL;
1093
1094         cleanup_child_pid = pid;
1095         if (!read_batch) {
1096                 set_nonblocking(f_in);
1097                 set_nonblocking(f_out);
1098         }
1099
1100         io_set_sock_fds(f_in, f_out);
1101         setup_protocol(f_out,f_in);
1102
1103         /* We set our stderr file handle to blocking because ssh might have
1104          * set it to non-blocking.  This can be particularly troublesome if
1105          * stderr is a clone of stdout, because ssh would have set our stdout
1106          * to non-blocking at the same time (which can easily cause us to lose
1107          * output from our print statements).  This kluge shouldn't cause ssh
1108          * any problems for how we use it.  Note also that we delayed setting
1109          * this until after the above protocol setup so that we know for sure
1110          * that ssh is done twiddling its file descriptors.  */
1111         set_blocking(STDERR_FILENO);
1112
1113         if (am_sender) {
1114                 keep_dirlinks = 0; /* Must be disabled on the sender. */
1115                 we_send_keepalive_messages = io_timeout != 0 && protocol_version < 31;
1116
1117                 if (always_checksum
1118                  && (log_format_has(stdout_format, 'C')
1119                   || log_format_has(logfile_format, 'C')))
1120                         sender_keeps_checksum = 1;
1121
1122                 if (protocol_version >= 30)
1123                         io_start_multiplex_out(f_out);
1124                 else
1125                         io_start_buffering_out(f_out);
1126                 if (protocol_version >= 31 || (!filesfrom_host && protocol_version >= 23))
1127                         io_start_multiplex_in(f_in);
1128                 else
1129                         io_start_buffering_in(f_in);
1130                 send_filter_list(f_out);
1131                 if (filesfrom_host)
1132                         filesfrom_fd = f_in;
1133
1134                 if (write_batch && !am_server)
1135                         start_write_batch(f_out);
1136                 flist = send_file_list(f_out, argc, argv);
1137                 if (DEBUG_GTE(FLIST, 3))
1138                         rprintf(FINFO,"file list sent\n");
1139
1140                 if (protocol_version < 31 && filesfrom_host && protocol_version >= 23)
1141                         io_start_multiplex_in(f_in);
1142
1143                 io_flush(NORMAL_FLUSH);
1144                 send_files(f_in, f_out);
1145                 io_flush(FULL_FLUSH);
1146                 handle_stats(-1);
1147                 if (protocol_version >= 24)
1148                         read_final_goodbye(f_in, f_out);
1149                 if (pid != -1) {
1150                         if (DEBUG_GTE(EXIT, 2))
1151                                 rprintf(FINFO,"client_run waiting on %d\n", (int) pid);
1152                         io_flush(FULL_FLUSH);
1153                         wait_process_with_flush(pid, &exit_code);
1154                 }
1155                 output_summary();
1156                 io_flush(FULL_FLUSH);
1157                 exit_cleanup(exit_code);
1158         }
1159
1160         if (!read_batch) {
1161                 if (protocol_version >= 23)
1162                         io_start_multiplex_in(f_in);
1163                 if (need_messages_from_generator)
1164                         io_start_multiplex_out(f_out);
1165                 else
1166                         io_start_buffering_out(f_out);
1167         }
1168
1169         send_filter_list(read_batch ? -1 : f_out);
1170
1171         if (filesfrom_fd >= 0) {
1172                 start_filesfrom_forwarding(filesfrom_fd);
1173                 filesfrom_fd = -1;
1174         }
1175
1176         if (write_batch && !am_server)
1177                 start_write_batch(f_in);
1178         flist = recv_file_list(f_in);
1179         if (inc_recurse && file_total == 1)
1180                 recv_additional_file_list(f_in);
1181
1182         if (flist && flist->used > 0) {
1183                 local_name = get_local_name(flist, argv[0]);
1184
1185                 check_alt_basis_dirs();
1186
1187                 exit_code2 = do_recv(f_in, f_out, local_name);
1188         } else {
1189                 handle_stats(-1);
1190                 output_summary();
1191         }
1192
1193         if (pid != -1) {
1194                 if (DEBUG_GTE(RECV, 1))
1195                         rprintf(FINFO,"client_run2 waiting on %d\n", (int) pid);
1196                 io_flush(FULL_FLUSH);
1197                 wait_process_with_flush(pid, &exit_code);
1198         }
1199
1200         return MAX(exit_code, exit_code2);
1201 }
1202
1203 static int copy_argv(char *argv[])
1204 {
1205         int i;
1206
1207         for (i = 0; argv[i]; i++) {
1208                 if (!(argv[i] = strdup(argv[i]))) {
1209                         rprintf (FERROR, "out of memory at %s(%d)\n",
1210                                  __FILE__, __LINE__);
1211                         return RERR_MALLOC;
1212                 }
1213         }
1214
1215         return 0;
1216 }
1217
1218
1219 /* Start a client for either type of remote connection.  Work out
1220  * whether the arguments request a remote shell or rsyncd connection,
1221  * and call the appropriate connection function, then run_client.
1222  *
1223  * Calls either start_socket_client (for sockets) or do_cmd and
1224  * client_run (for ssh). */
1225 static int start_client(int argc, char *argv[])
1226 {
1227         char *p, *shell_machine = NULL, *shell_user = NULL;
1228         char **remote_argv;
1229         int remote_argc;
1230         int f_in, f_out;
1231         int ret;
1232         pid_t pid;
1233
1234         /* Don't clobber argv[] so that ps(1) can still show the right
1235          * command line. */
1236         if ((ret = copy_argv(argv)) != 0)
1237                 return ret;
1238
1239         if (!read_batch) { /* for read_batch, NO source is specified */
1240                 char *path = check_for_hostspec(argv[0], &shell_machine, &rsync_port);
1241                 if (path) { /* source is remote */
1242                         char *dummy_host;
1243                         int dummy_port = 0;
1244                         *argv = path;
1245                         remote_argv = argv;
1246                         remote_argc = argc;
1247                         argv += argc - 1;
1248                         if (argc == 1 || **argv == ':')
1249                                 argc = 0; /* no dest arg */
1250                         else if (check_for_hostspec(*argv, &dummy_host, &dummy_port)) {
1251                                 rprintf(FERROR,
1252                                         "The source and destination cannot both be remote.\n");
1253                                 exit_cleanup(RERR_SYNTAX);
1254                         } else {
1255                                 remote_argc--; /* don't count dest */
1256                                 argc = 1;
1257                         }
1258                         if (filesfrom_host && *filesfrom_host
1259                             && strcmp(filesfrom_host, shell_machine) != 0) {
1260                                 rprintf(FERROR,
1261                                         "--files-from hostname is not the same as the transfer hostname\n");
1262                                 exit_cleanup(RERR_SYNTAX);
1263                         }
1264                         am_sender = 0;
1265                         if (rsync_port)
1266                                 daemon_over_rsh = shell_cmd ? 1 : -1;
1267                 } else { /* source is local, check dest arg */
1268                         am_sender = 1;
1269
1270                         if (argc > 1) {
1271                                 p = argv[--argc];
1272                                 remote_argv = argv + argc;
1273                         } else {
1274                                 static char *dotarg[1] = { "." };
1275                                 p = dotarg[0];
1276                                 remote_argv = dotarg;
1277                         }
1278                         remote_argc = 1;
1279
1280                         path = check_for_hostspec(p, &shell_machine, &rsync_port);
1281                         if (path && filesfrom_host && *filesfrom_host
1282                             && strcmp(filesfrom_host, shell_machine) != 0) {
1283                                 rprintf(FERROR,
1284                                         "--files-from hostname is not the same as the transfer hostname\n");
1285                                 exit_cleanup(RERR_SYNTAX);
1286                         }
1287                         if (!path) { /* no hostspec found, so src & dest are local */
1288                                 local_server = 1;
1289                                 if (filesfrom_host) {
1290                                         rprintf(FERROR,
1291                                                 "--files-from cannot be remote when the transfer is local\n");
1292                                         exit_cleanup(RERR_SYNTAX);
1293                                 }
1294                                 shell_machine = NULL;
1295                         } else { /* hostspec was found, so dest is remote */
1296                                 argv[argc] = path;
1297                                 if (rsync_port)
1298                                         daemon_over_rsh = shell_cmd ? 1 : -1;
1299                         }
1300                 }
1301         } else {  /* read_batch */
1302                 local_server = 1;
1303                 if (check_for_hostspec(argv[argc-1], &shell_machine, &rsync_port)) {
1304                         rprintf(FERROR, "remote destination is not allowed with --read-batch\n");
1305                         exit_cleanup(RERR_SYNTAX);
1306                 }
1307                 remote_argv = argv += argc - 1;
1308                 remote_argc = argc = 1;
1309         }
1310
1311         if (am_sender) {
1312                 char *dummy_host;
1313                 int dummy_port = rsync_port;
1314                 int i;
1315                 /* For local source, extra source args must not have hostspec. */
1316                 for (i = 1; i < argc; i++) {
1317                         if (check_for_hostspec(argv[i], &dummy_host, &dummy_port)) {
1318                                 rprintf(FERROR, "Unexpected remote arg: %s\n", argv[i]);
1319                                 exit_cleanup(RERR_SYNTAX);
1320                         }
1321                 }
1322         } else {
1323                 char *dummy_host;
1324                 int dummy_port = rsync_port;
1325                 int i;
1326                 /* For remote source, any extra source args must have either
1327                  * the same hostname or an empty hostname. */
1328                 for (i = 1; i < remote_argc; i++) {
1329                         char *arg = check_for_hostspec(remote_argv[i], &dummy_host, &dummy_port);
1330                         if (!arg) {
1331                                 rprintf(FERROR, "Unexpected local arg: %s\n", remote_argv[i]);
1332                                 rprintf(FERROR, "If arg is a remote file/dir, prefix it with a colon (:).\n");
1333                                 exit_cleanup(RERR_SYNTAX);
1334                         }
1335                         if (*dummy_host && strcmp(dummy_host, shell_machine) != 0) {
1336                                 rprintf(FERROR, "All source args must come from the same machine.\n");
1337                                 exit_cleanup(RERR_SYNTAX);
1338                         }
1339                         if (rsync_port != dummy_port) {
1340                                 if (!rsync_port || !dummy_port)
1341                                         rprintf(FERROR, "All source args must use the same hostspec format.\n");
1342                                 else
1343                                         rprintf(FERROR, "All source args must use the same port number.\n");
1344                                 exit_cleanup(RERR_SYNTAX);
1345                         }
1346                         remote_argv[i] = arg;
1347                 }
1348         }
1349
1350         if (daemon_over_rsh < 0)
1351                 return start_socket_client(shell_machine, remote_argc, remote_argv, argc, argv);
1352
1353         if (password_file && !daemon_over_rsh) {
1354                 rprintf(FERROR, "The --password-file option may only be "
1355                                 "used when accessing an rsync daemon.\n");
1356                 exit_cleanup(RERR_SYNTAX);
1357         }
1358
1359         if (connect_timeout) {
1360                 rprintf(FERROR, "The --contimeout option may only be "
1361                                 "used when connecting to an rsync daemon.\n");
1362                 exit_cleanup(RERR_SYNTAX);
1363         }
1364
1365         if (shell_machine) {
1366                 p = strrchr(shell_machine,'@');
1367                 if (p) {
1368                         *p = 0;
1369                         shell_user = shell_machine;
1370                         shell_machine = p+1;
1371                 }
1372         }
1373
1374         if (DEBUG_GTE(CMD, 2)) {
1375                 rprintf(FINFO,"cmd=%s machine=%s user=%s path=%s\n",
1376                         NS(shell_cmd), NS(shell_machine), NS(shell_user),
1377                         NS(remote_argv[0]));
1378         }
1379
1380         pid = do_cmd(shell_cmd, shell_machine, shell_user, remote_argv, remote_argc,
1381                      &f_in, &f_out);
1382
1383         /* if we're running an rsync server on the remote host over a
1384          * remote shell command, we need to do the RSYNCD protocol first */
1385         if (daemon_over_rsh) {
1386                 int tmpret;
1387                 tmpret = start_inband_exchange(f_in, f_out, shell_user, remote_argc, remote_argv);
1388                 if (tmpret < 0)
1389                         return tmpret;
1390         }
1391
1392         ret = client_run(f_in, f_out, pid, argc, argv);
1393
1394         fflush(stdout);
1395         fflush(stderr);
1396
1397         return ret;
1398 }
1399
1400
1401 static RETSIGTYPE sigusr1_handler(UNUSED(int val))
1402 {
1403         exit_cleanup(RERR_SIGNAL1);
1404 }
1405
1406 static RETSIGTYPE sigusr2_handler(UNUSED(int val))
1407 {
1408         if (!am_server)
1409                 output_summary();
1410         close_all();
1411         if (got_xfer_error)
1412                 _exit(RERR_PARTIAL);
1413         _exit(0);
1414 }
1415
1416 RETSIGTYPE remember_children(UNUSED(int val))
1417 {
1418 #ifdef WNOHANG
1419         int cnt, status;
1420         pid_t pid;
1421         /* An empty waitpid() loop was put here by Tridge and we could never
1422          * get him to explain why he put it in, so rather than taking it
1423          * out we're instead saving the child exit statuses for later use.
1424          * The waitpid() loop presumably eliminates all possibility of leaving
1425          * zombie children, maybe that's why he did it. */
1426         while ((pid = waitpid(-1, &status, WNOHANG)) > 0) {
1427                 /* save the child's exit status */
1428                 for (cnt = 0; cnt < MAXCHILDPROCS; cnt++) {
1429                         if (pid_stat_table[cnt].pid == 0) {
1430                                 pid_stat_table[cnt].pid = pid;
1431                                 pid_stat_table[cnt].status = status;
1432                                 break;
1433                         }
1434                 }
1435         }
1436 #endif
1437 #ifndef HAVE_SIGACTION
1438         signal(SIGCHLD, remember_children);
1439 #endif
1440 }
1441
1442
1443 /**
1444  * This routine catches signals and tries to send them to gdb.
1445  *
1446  * Because it's called from inside a signal handler it ought not to
1447  * use too many library routines.
1448  *
1449  * @todo Perhaps use "screen -X" instead/as well, to help people
1450  * debugging without easy access to X.  Perhaps use an environment
1451  * variable, or just call a script?
1452  *
1453  * @todo The /proc/ magic probably only works on Linux (and
1454  * Solaris?)  Can we be more portable?
1455  **/
1456 #ifdef MAINTAINER_MODE
1457 const char *get_panic_action(void)
1458 {
1459         const char *cmd_fmt = getenv("RSYNC_PANIC_ACTION");
1460
1461         if (cmd_fmt)
1462                 return cmd_fmt;
1463         else
1464                 return "xterm -display :0 -T Panic -n Panic "
1465                         "-e gdb /proc/%d/exe %d";
1466 }
1467
1468
1469 /**
1470  * Handle a fatal signal by launching a debugger, controlled by $RSYNC_PANIC_ACTION.
1471  *
1472  * This signal handler is only installed if we were configured with
1473  * --enable-maintainer-mode.  Perhaps it should always be on and we
1474  * should just look at the environment variable, but I'm a bit leery
1475  * of a signal sending us into a busy loop.
1476  **/
1477 static RETSIGTYPE rsync_panic_handler(UNUSED(int whatsig))
1478 {
1479         char cmd_buf[300];
1480         int ret;
1481
1482         snprintf(cmd_buf, sizeof cmd_buf, get_panic_action(),
1483                  getpid(), getpid());
1484
1485         /* Unless we failed to execute gdb, we allow the process to
1486          * continue.  I'm not sure if that's right. */
1487         ret = system(cmd_buf);
1488         if (ret)
1489                 _exit(ret);
1490 }
1491 #endif
1492
1493
1494 int main(int argc,char *argv[])
1495 {
1496         int ret;
1497         int orig_argc = argc;
1498         char **orig_argv = argv;
1499 #ifdef HAVE_SIGACTION
1500 # ifdef HAVE_SIGPROCMASK
1501         sigset_t sigmask;
1502
1503         sigemptyset(&sigmask);
1504 # endif
1505         sigact.sa_flags = SA_NOCLDSTOP;
1506 #endif
1507         SIGACTMASK(SIGUSR1, sigusr1_handler);
1508         SIGACTMASK(SIGUSR2, sigusr2_handler);
1509         SIGACTMASK(SIGCHLD, remember_children);
1510 #ifdef MAINTAINER_MODE
1511         SIGACTMASK(SIGSEGV, rsync_panic_handler);
1512         SIGACTMASK(SIGFPE, rsync_panic_handler);
1513         SIGACTMASK(SIGABRT, rsync_panic_handler);
1514         SIGACTMASK(SIGBUS, rsync_panic_handler);
1515 #endif
1516
1517         starttime = time(NULL);
1518         our_uid = MY_UID();
1519         our_gid = MY_GID();
1520         am_root = our_uid == 0;
1521
1522         memset(&stats, 0, sizeof(stats));
1523
1524         if (argc < 2) {
1525                 usage(FERROR);
1526                 exit_cleanup(RERR_SYNTAX);
1527         }
1528
1529         /* we set a 0 umask so that correct file permissions can be
1530          * carried across */
1531         orig_umask = umask(0);
1532
1533 #if defined CONFIG_LOCALE && defined HAVE_SETLOCALE
1534         setlocale(LC_CTYPE, "");
1535 #endif
1536
1537         if (!parse_arguments(&argc, (const char ***) &argv)) {
1538                 /* FIXME: We ought to call the same error-handling
1539                  * code here, rather than relying on getopt. */
1540                 option_error();
1541                 exit_cleanup(RERR_SYNTAX);
1542         }
1543
1544         SIGACTMASK(SIGINT, sig_int);
1545         SIGACTMASK(SIGHUP, sig_int);
1546         SIGACTMASK(SIGTERM, sig_int);
1547 #if defined HAVE_SIGACTION && HAVE_SIGPROCMASK
1548         sigprocmask(SIG_UNBLOCK, &sigmask, NULL);
1549 #endif
1550
1551         /* Ignore SIGPIPE; we consistently check error codes and will
1552          * see the EPIPE. */
1553         SIGACTION(SIGPIPE, SIG_IGN);
1554 #ifdef SIGXFSZ
1555         SIGACTION(SIGXFSZ, SIG_IGN);
1556 #endif
1557
1558         /* Initialize change_dir() here because on some old systems getcwd
1559          * (implemented by forking "pwd" and reading its output) doesn't
1560          * work when there are other child processes.  Also, on all systems
1561          * that implement getcwd that way "pwd" can't be found after chroot. */
1562         change_dir(NULL, CD_NORMAL);
1563
1564         init_flist();
1565
1566         if ((write_batch || read_batch) && !am_server) {
1567                 if (write_batch)
1568                         write_batch_shell_file(orig_argc, orig_argv, argc);
1569
1570                 if (read_batch && strcmp(batch_name, "-") == 0)
1571                         batch_fd = STDIN_FILENO;
1572                 else {
1573                         batch_fd = do_open(batch_name,
1574                                    write_batch ? O_WRONLY | O_CREAT | O_TRUNC
1575                                    : O_RDONLY, S_IRUSR | S_IWUSR);
1576                 }
1577                 if (batch_fd < 0) {
1578                         rsyserr(FERROR, errno, "Batch file %s open error",
1579                                 full_fname(batch_name));
1580                         exit_cleanup(RERR_FILEIO);
1581                 }
1582                 if (read_batch)
1583                         read_stream_flags(batch_fd);
1584                 else
1585                         write_stream_flags(batch_fd);
1586         }
1587         if (write_batch < 0)
1588                 dry_run = 1;
1589
1590         if (am_server) {
1591 #ifdef ICONV_CONST
1592                 setup_iconv();
1593 #endif
1594         } else if (am_daemon)
1595                 return daemon_main();
1596
1597         if (am_server && protect_args) {
1598                 char buf[MAXPATHLEN];
1599                 protect_args = 2;
1600                 read_args(STDIN_FILENO, NULL, buf, sizeof buf, 1, &argv, &argc, NULL);
1601                 if (!parse_arguments(&argc, (const char ***) &argv)) {
1602                         option_error();
1603                         exit_cleanup(RERR_SYNTAX);
1604                 }
1605         }
1606
1607         if (argc < 1) {
1608                 usage(FERROR);
1609                 exit_cleanup(RERR_SYNTAX);
1610         }
1611
1612         if (am_server) {
1613                 set_nonblocking(STDIN_FILENO);
1614                 set_nonblocking(STDOUT_FILENO);
1615                 if (am_daemon)
1616                         return start_daemon(STDIN_FILENO, STDOUT_FILENO);
1617                 start_server(STDIN_FILENO, STDOUT_FILENO, argc, argv);
1618         }
1619
1620         ret = start_client(argc, argv);
1621         if (ret == -1)
1622                 exit_cleanup(RERR_STARTCLIENT);
1623         else
1624                 exit_cleanup(ret);
1625
1626         return ret;
1627 }