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 dev_t filesystem_dev;
  74 extern pid_t cleanup_child_pid;
  75 extern size_t bwlimit_writemax;
  76 extern unsigned int module_dirlen;
  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                         if (**remote_argv == '-') {
 498                                 if (asprintf(args + argc++, "./%s", *remote_argv++) < 0)
 499                                         out_of_memory("do_cmd");
 500                         } else
 501                                 args[argc++] = *remote_argv++;
 502                         remote_argc--;
 503                 }
 504         }
 505
 506         args[argc] = NULL;
 507
 508         if (DEBUG_GTE(CMD, 2)) {
 509                 for (i = 0; i < argc; i++)
 510                         rprintf(FCLIENT, "cmd[%d]=%s ", i, args[i]);
 511                 rprintf(FCLIENT, "\n");
 512         }
 513
 514         if (read_batch) {
 515                 int from_gen_pipe[2];
 516                 set_allow_inc_recurse();
 517                 if (fd_pair(from_gen_pipe) < 0) {
 518                         rsyserr(FERROR, errno, "pipe");
 519                         exit_cleanup(RERR_IPC);
 520                 }
 521                 batch_gen_fd = from_gen_pipe[0];
 522                 *f_out_p = from_gen_pipe[1];
 523                 *f_in_p = batch_fd;
 524                 pid = (pid_t)-1; /* no child pid */
 525 #ifdef ICONV_CONST
 526                 setup_iconv();
 527 #endif
 528         } else if (local_server) {
 529                 /* If the user didn't request --[no-]whole-file, force
 530                  * it on, but only if we're not batch processing. */
 531                 if (whole_file < 0 && !write_batch)
 532                         whole_file = 1;
 533                 set_allow_inc_recurse();
 534                 pid = local_child(argc, args, f_in_p, f_out_p, child_main);
 535 #ifdef ICONV_CONST
 536                 setup_iconv();
 537 #endif
 538         } else {
 539                 pid = piped_child(args, f_in_p, f_out_p);
 540 #ifdef ICONV_CONST
 541                 setup_iconv();
 542 #endif
 543                 if (protect_args && !daemon_over_rsh)
 544                         send_protected_args(*f_out_p, args);
 545         }
 546
 547         if (need_to_free)
 548                 free(need_to_free);
 549
 550         return pid;
 551
 552   oom:
 553         out_of_memory("do_cmd");
 554         return 0; /* not reached */
 555 }
 556
 557 /* The receiving side operates in one of two modes:
 558  *
 559  * 1. it receives any number of files into a destination directory,
 560  * placing them according to their names in the file-list.
 561  *
 562  * 2. it receives a single file and saves it using the name in the
 563  * destination path instead of its file-list name.  This requires a
 564  * "local name" for writing out the destination file.
 565  *
 566  * So, our task is to figure out what mode/local-name we need.
 567  * For mode 1, we change into the destination directory and return NULL.
 568  * For mode 2, we change into the directory containing the destination
 569  * file (if we aren't already there) and return the local-name. */
 570 static char *get_local_name(struct file_list *flist, char *dest_path)
 571 {
 572         STRUCT_STAT st;
 573         int statret;
 574         char *cp;
 575
 576         if (DEBUG_GTE(RECV, 1)) {
 577                 rprintf(FINFO, "get_local_name count=%d %s\n",
 578                         file_total, NS(dest_path));
 579         }
 580
 581         if (!dest_path || list_only)
 582                 return NULL;
 583
 584         /* Treat an empty string as a copy into the current directory. */
 585         if (!*dest_path)
 586             dest_path = ".";
 587
 588         if (daemon_filter_list.head) {
 589                 char *slash = strrchr(dest_path, '/');
 590                 if (slash && (slash[1] == '\0' || (slash[1] == '.' && slash[2] == '\0')))
 591                         *slash = '\0';
 592                 else
 593                         slash = NULL;
 594                 if ((*dest_path != '.' || dest_path[1] != '\0')
 595                  && (check_filter(&daemon_filter_list, FLOG, dest_path, 0) < 0
 596                   || check_filter(&daemon_filter_list, FLOG, dest_path, 1) < 0)) {
 597                         rprintf(FERROR, "skipping daemon-excluded destination \"%s\"\n",
 598                                 dest_path);
 599                         exit_cleanup(RERR_FILESELECT);
 600                 }
 601                 if (slash)
 602                         *slash = '/';
 603         }
 604
 605         /* See what currently exists at the destination. */
 606         if ((statret = do_stat(dest_path, &st)) == 0) {
 607                 /* If the destination is a dir, enter it and use mode 1. */
 608                 if (S_ISDIR(st.st_mode)) {
 609                         if (!change_dir(dest_path, CD_NORMAL)) {
 610                                 rsyserr(FERROR, errno, "change_dir#1 %s failed",
 611                                         full_fname(dest_path));
 612                                 exit_cleanup(RERR_FILESELECT);
 613                         }
 614                         filesystem_dev = st.st_dev; /* ensures --force works right w/-x */
 615                         return NULL;
 616                 }
 617                 if (file_total > 1) {
 618                         rprintf(FERROR,
 619                                 "ERROR: destination must be a directory when"
 620                                 " copying more than 1 file\n");
 621                         exit_cleanup(RERR_FILESELECT);
 622                 }
 623                 if (file_total == 1 && S_ISDIR(flist->files[0]->mode)) {
 624                         rprintf(FERROR,
 625                                 "ERROR: cannot overwrite non-directory"
 626                                 " with a directory\n");
 627                         exit_cleanup(RERR_FILESELECT);
 628                 }
 629         } else if (errno != ENOENT) {
 630                 /* If we don't know what's at the destination, fail. */
 631                 rsyserr(FERROR, errno, "ERROR: cannot stat destination %s",
 632                         full_fname(dest_path));
 633                 exit_cleanup(RERR_FILESELECT);
 634         }
 635
 636         cp = strrchr(dest_path, '/');
 637
 638         /* If we need a destination directory because the transfer is not
 639          * of a single non-directory or the user has requested one via a
 640          * destination path ending in a slash, create one and use mode 1. */
 641         if (file_total > 1 || (cp && !cp[1])) {
 642                 /* Lop off the final slash (if any). */
 643                 if (cp && !cp[1])
 644                         *cp = '\0';
 645
 646                 if (statret == 0) {
 647                         rprintf(FERROR,
 648                             "ERROR: destination path is not a directory\n");
 649                         exit_cleanup(RERR_SYNTAX);
 650                 }
 651
 652                 if (do_mkdir(dest_path, ACCESSPERMS) != 0) {
 653                         rsyserr(FERROR, errno, "mkdir %s failed",
 654                                 full_fname(dest_path));
 655                         exit_cleanup(RERR_FILEIO);
 656                 }
 657
 658                 if (flist->high >= flist->low
 659                  && strcmp(flist->files[flist->low]->basename, ".") == 0)
 660                         flist->files[0]->flags |= FLAG_DIR_CREATED;
 661
 662                 if (INFO_GTE(NAME, 1))
 663                         rprintf(FINFO, "created directory %s\n", dest_path);
 664
 665                 if (dry_run) {
 666                         /* Indicate that dest dir doesn't really exist. */
 667                         dry_run++;
 668                 }
 669
 670                 if (!change_dir(dest_path, dry_run > 1 ? CD_SKIP_CHDIR : CD_NORMAL)) {
 671                         rsyserr(FERROR, errno, "change_dir#2 %s failed",
 672                                 full_fname(dest_path));
 673                         exit_cleanup(RERR_FILESELECT);
 674                 }
 675
 676                 return NULL;
 677         }
 678
 679         /* Otherwise, we are writing a single file, possibly on top of an
 680          * existing non-directory.  Change to the item's parent directory
 681          * (if it has a path component), return the basename of the
 682          * destination file as the local name, and use mode 2. */
 683         if (!cp)
 684                 return dest_path;
 685
 686         if (cp == dest_path)
 687                 dest_path = "/";
 688
 689         *cp = '\0';
 690         if (!change_dir(dest_path, CD_NORMAL)) {
 691                 rsyserr(FERROR, errno, "change_dir#3 %s failed",
 692                         full_fname(dest_path));
 693                 exit_cleanup(RERR_FILESELECT);
 694         }
 695         *cp = '/';
 696
 697         return cp + 1;
 698 }
 699
 700 /* This function checks on our alternate-basis directories.  If we're in
 701  * dry-run mode and the destination dir does not yet exist, we'll try to
 702  * tweak any dest-relative paths to make them work for a dry-run (the
 703  * destination dir must be in curr_dir[] when this function is called).
 704  * We also warn about any arg that is non-existent or not a directory. */
 705 static void check_alt_basis_dirs(void)
 706 {
 707         STRUCT_STAT st;
 708         char **dir_p, *slash = strrchr(curr_dir, '/');
 709
 710         for (dir_p = basis_dir; *dir_p; dir_p++) {
 711                 if (dry_run > 1 && **dir_p != '/') {
 712                         int len = curr_dir_len + 1 + strlen(*dir_p) + 1;
 713                         char *new = new_array(char, len);
 714                         if (!new)
 715                                 out_of_memory("check_alt_basis_dirs");
 716                         if (slash && strncmp(*dir_p, "../", 3) == 0) {
 717                             /* We want to remove only one leading "../" prefix for
 718                              * the directory we couldn't create in dry-run mode:
 719                              * this ensures that any other ".." references get
 720                              * evaluated the same as they would for a live copy. */
 721                             *slash = '\0';
 722                             pathjoin(new, len, curr_dir, *dir_p + 3);
 723                             *slash = '/';
 724                         } else
 725                             pathjoin(new, len, curr_dir, *dir_p);
 726                         *dir_p = new;
 727                 }
 728                 if (do_stat(*dir_p, &st) < 0) {
 729                         rprintf(FWARNING, "%s arg does not exist: %s\n",
 730                                 dest_option, *dir_p);
 731                 } else if (!S_ISDIR(st.st_mode)) {
 732                         rprintf(FWARNING, "%s arg is not a dir: %s\n",
 733                                 dest_option, *dir_p);
 734                 }
 735         }
 736 }
 737
 738 /* This is only called by the sender. */
 739 static void read_final_goodbye(int f_in, int f_out)
 740 {
 741         int i, iflags, xlen;
 742         uchar fnamecmp_type;
 743         char xname[MAXPATHLEN];
 744
 745         shutting_down = True;
 746
 747         if (protocol_version < 29)
 748                 i = read_int(f_in);
 749         else {
 750                 i = read_ndx_and_attrs(f_in, f_out, &iflags, &fnamecmp_type, xname, &xlen);
 751                 if (protocol_version >= 31 && i == NDX_DONE) {
 752                         if (am_sender)
 753                                 write_ndx(f_out, NDX_DONE);
 754                         else {
 755                                 if (batch_gen_fd >= 0) {
 756                                         while (read_int(batch_gen_fd) != NDX_DEL_STATS) {}
 757                                         read_del_stats(batch_gen_fd);
 758                                 }
 759                                 write_int(f_out, NDX_DONE);
 760                         }
 761                         i = read_ndx_and_attrs(f_in, f_out, &iflags, &fnamecmp_type, xname, &xlen);
 762                 }
 763         }
 764
 765         if (i != NDX_DONE) {
 766                 rprintf(FERROR, "Invalid packet at end of run (%d) [%s]\n",
 767                         i, who_am_i());
 768                 exit_cleanup(RERR_PROTOCOL);
 769         }
 770 }
 771
 772 static void do_server_sender(int f_in, int f_out, int argc, char *argv[])
 773 {
 774         struct file_list *flist;
 775         char *dir = argv[0];
 776
 777         if (DEBUG_GTE(SEND, 1)) {
 778                 rprintf(FINFO, "server_sender starting pid=%ld\n",
 779                         (long)getpid());
 780         }
 781
 782         if (am_daemon && lp_write_only(module_id)) {
 783                 rprintf(FERROR, "ERROR: module is write only\n");
 784                 exit_cleanup(RERR_SYNTAX);
 785                 return;
 786         }
 787         if (am_daemon && read_only && remove_source_files) {
 788                 rprintf(FERROR,
 789                     "ERROR: --remove-%s-files cannot be used with a read-only module\n",
 790                     remove_source_files == 1 ? "source" : "sent");
 791                 exit_cleanup(RERR_SYNTAX);
 792                 return;
 793         }
 794
 795         if (!relative_paths) {
 796                 if (!change_dir(dir, CD_NORMAL)) {
 797                         rsyserr(FERROR, errno, "change_dir#3 %s failed",
 798                                 full_fname(dir));
 799                         exit_cleanup(RERR_FILESELECT);
 800                 }
 801         }
 802         argc--;
 803         argv++;
 804
 805         if (argc == 0 && (recurse || xfer_dirs || list_only)) {
 806                 argc = 1;
 807                 argv--;
 808                 argv[0] = ".";
 809         }
 810
 811         flist = send_file_list(f_out,argc,argv);
 812         if (!flist || flist->used == 0)
 813                 exit_cleanup(0);
 814
 815         io_start_buffering_in(f_in);
 816
 817         send_files(f_in, f_out);
 818         io_flush(FULL_FLUSH);
 819         handle_stats(f_out);
 820         if (protocol_version >= 24)
 821                 read_final_goodbye(f_in, f_out);
 822         io_flush(FULL_FLUSH);
 823         exit_cleanup(0);
 824 }
 825
 826
 827 static int do_recv(int f_in, int f_out, char *local_name)
 828 {
 829         int pid;
 830         int exit_code = 0;
 831         int error_pipe[2];
 832
 833         /* The receiving side mustn't obey this, or an existing symlink that
 834          * points to an identical file won't be replaced by the referent. */
 835         copy_links = copy_dirlinks = copy_unsafe_links = 0;
 836
 837 #ifdef SUPPORT_HARD_LINKS
 838         if (preserve_hard_links && !inc_recurse)
 839                 match_hard_links(first_flist);
 840 #endif
 841
 842         if (fd_pair(error_pipe) < 0) {
 843                 rsyserr(FERROR, errno, "pipe failed in do_recv");
 844                 exit_cleanup(RERR_IPC);
 845         }
 846
 847         if (backup_dir) {
 848                 int ret = make_path(backup_dir_buf, MKP_DROP_NAME); /* drops trailing slash */
 849                 if (ret < 0)
 850                         exit_cleanup(RERR_SYNTAX);
 851                 if (ret)
 852                         rprintf(FINFO, "Created backup_dir %s\n", backup_dir_buf);
 853                 else if (INFO_GTE(BACKUP, 1))
 854                         rprintf(FINFO, "backup_dir is %s\n", backup_dir_buf);
 855         }
 856
 857         io_flush(FULL_FLUSH);
 858
 859         if ((pid = do_fork()) == -1) {
 860                 rsyserr(FERROR, errno, "fork failed in do_recv");
 861                 exit_cleanup(RERR_IPC);
 862         }
 863
 864         if (pid == 0) {
 865                 am_receiver = 1;
 866                 send_msgs_to_gen = am_server;
 867
 868                 close(error_pipe[0]);
 869
 870                 /* We can't let two processes write to the socket at one time. */
 871                 io_end_multiplex_out(MPLX_SWITCHING);
 872                 if (f_in != f_out)
 873                         close(f_out);
 874                 sock_f_out = -1;
 875                 f_out = error_pipe[1];
 876
 877                 bwlimit_writemax = 0; /* receiver doesn't need to do this */
 878
 879                 if (read_batch)
 880                         io_start_buffering_in(f_in);
 881                 io_start_multiplex_out(f_out);
 882
 883                 recv_files(f_in, f_out, local_name);
 884                 io_flush(FULL_FLUSH);
 885                 handle_stats(f_in);
 886
 887                 if (output_needs_newline) {
 888                         fputc('\n', stdout);
 889                         output_needs_newline = 0;
 890                 }
 891
 892                 write_int(f_out, NDX_DONE);
 893                 send_msg(MSG_STATS, (char*)&stats.total_read, sizeof stats.total_read, 0);
 894                 io_flush(FULL_FLUSH);
 895
 896                 /* Handle any keep-alive packets from the post-processing work
 897                  * that the generator does. */
 898                 if (protocol_version >= 29) {
 899                         kluge_around_eof = -1;
 900
 901                         /* This should only get stopped via a USR2 signal. */
 902                         read_final_goodbye(f_in, f_out);
 903
 904                         rprintf(FERROR, "Invalid packet at end of run [%s]\n",
 905                                 who_am_i());
 906                         exit_cleanup(RERR_PROTOCOL);
 907                 }
 908
 909                 /* Finally, we go to sleep until our parent kills us with a
 910                  * USR2 signal.  We sleep for a short time, as on some OSes
 911                  * a signal won't interrupt a sleep! */
 912                 while (1)
 913                         msleep(20);
 914         }
 915
 916         am_generator = 1;
 917         flist_receiving_enabled = True;
 918
 919         io_end_multiplex_in(MPLX_SWITCHING);
 920         if (write_batch && !am_server)
 921                 stop_write_batch();
 922
 923         close(error_pipe[1]);
 924         if (f_in != f_out)
 925                 close(f_in);
 926         sock_f_in = -1;
 927         f_in = error_pipe[0];
 928
 929         io_start_buffering_out(f_out);
 930         io_start_multiplex_in(f_in);
 931
 932 #ifdef SUPPORT_HARD_LINKS
 933         if (preserve_hard_links && inc_recurse) {
 934                 struct file_list *flist;
 935                 for (flist = first_flist; flist; flist = flist->next)
 936                         match_hard_links(flist);
 937         }
 938 #endif
 939
 940         generate_files(f_out, local_name);
 941
 942         handle_stats(-1);
 943         io_flush(FULL_FLUSH);
 944         shutting_down = True;
 945         if (protocol_version >= 24) {
 946                 /* send a final goodbye message */
 947                 write_ndx(f_out, NDX_DONE);
 948         }
 949         io_flush(FULL_FLUSH);
 950
 951         kill(pid, SIGUSR2);
 952         wait_process_with_flush(pid, &exit_code);
 953         return exit_code;
 954 }
 955
 956 static void do_server_recv(int f_in, int f_out, int argc, char *argv[])
 957 {
 958         int exit_code;
 959         struct file_list *flist;
 960         char *local_name = NULL;
 961         int negated_levels;
 962
 963         if (filesfrom_fd >= 0 && !msgs2stderr && protocol_version < 31) {
 964                 /* We can't mix messages with files-from data on the socket,
 965                  * so temporarily turn off info/debug messages. */
 966                 negate_output_levels();
 967                 negated_levels = 1;
 968         } else
 969                 negated_levels = 0;
 970
 971         if (DEBUG_GTE(RECV, 1)) {
 972                 rprintf(FINFO, "server_recv(%d) starting pid=%ld\n",
 973                         argc, (long)getpid());
 974         }
 975
 976         if (am_daemon && read_only) {
 977                 rprintf(FERROR,"ERROR: module is read only\n");
 978                 exit_cleanup(RERR_SYNTAX);
 979                 return;
 980         }
 981
 982         if (argc > 0) {
 983                 char *dir = argv[0];
 984                 argc--;
 985                 argv++;
 986                 if (!am_daemon && !change_dir(dir, CD_NORMAL)) {
 987                         rsyserr(FERROR, errno, "change_dir#4 %s failed",
 988                                 full_fname(dir));
 989                         exit_cleanup(RERR_FILESELECT);
 990                 }
 991         }
 992
 993         if (protocol_version >= 30)
 994                 io_start_multiplex_in(f_in);
 995         else
 996                 io_start_buffering_in(f_in);
 997         recv_filter_list(f_in);
 998
 999         if (filesfrom_fd >= 0) {
1000                 /* We need to send the files-from names to the sender at the
1001                  * same time that we receive the file-list from them, so we
1002                  * need the IO routines to automatically write out the names
1003                  * onto our f_out socket as we read the file-list.  This
1004                  * avoids both deadlock and extra delays/buffers. */
1005                 start_filesfrom_forwarding(filesfrom_fd);
1006                 filesfrom_fd = -1;
1007         }
1008
1009         flist = recv_file_list(f_in);
1010         if (!flist) {
1011                 rprintf(FERROR,"server_recv: recv_file_list error\n");
1012                 exit_cleanup(RERR_FILESELECT);
1013         }
1014         if (inc_recurse && file_total == 1)
1015                 recv_additional_file_list(f_in);
1016
1017         if (negated_levels)
1018                 negate_output_levels();
1019
1020         if (argc > 0)
1021                 local_name = get_local_name(flist,argv[0]);
1022
1023         /* Now that we know what our destination directory turned out to be,
1024          * we can sanitize the --link-/copy-/compare-dest args correctly. */
1025         if (sanitize_paths) {
1026                 char **dir_p;
1027                 for (dir_p = basis_dir; *dir_p; dir_p++)
1028                         *dir_p = sanitize_path(NULL, *dir_p, NULL, curr_dir_depth, SP_DEFAULT);
1029                 if (partial_dir)
1030                         partial_dir = sanitize_path(NULL, partial_dir, NULL, curr_dir_depth, SP_DEFAULT);
1031         }
1032         check_alt_basis_dirs();
1033
1034         if (daemon_filter_list.head) {
1035                 char **dir_p;
1036                 filter_rule_list *elp = &daemon_filter_list;
1037
1038                 for (dir_p = basis_dir; *dir_p; dir_p++) {
1039                         char *dir = *dir_p;
1040                         if (*dir == '/')
1041                                 dir += module_dirlen;
1042                         if (check_filter(elp, FLOG, dir, 1) < 0)
1043                                 goto options_rejected;
1044                 }
1045                 if (partial_dir && *partial_dir == '/'
1046                  && check_filter(elp, FLOG, partial_dir + module_dirlen, 1) < 0) {
1047                     options_rejected:
1048                         rprintf(FERROR,
1049                                 "Your options have been rejected by the server.\n");
1050                         exit_cleanup(RERR_SYNTAX);
1051                 }
1052         }
1053
1054         exit_code = do_recv(f_in, f_out, local_name);
1055         exit_cleanup(exit_code);
1056 }
1057
1058
1059 int child_main(int argc, char *argv[])
1060 {
1061         start_server(STDIN_FILENO, STDOUT_FILENO, argc, argv);
1062         return 0;
1063 }
1064
1065
1066 void start_server(int f_in, int f_out, int argc, char *argv[])
1067 {
1068         set_nonblocking(f_in);
1069         set_nonblocking(f_out);
1070
1071         io_set_sock_fds(f_in, f_out);
1072         setup_protocol(f_out, f_in);
1073
1074         if (protocol_version >= 23)
1075                 io_start_multiplex_out(f_out);
1076         if (am_daemon && io_timeout && protocol_version >= 31)
1077                 send_msg_int(MSG_IO_TIMEOUT, io_timeout);
1078
1079         if (am_sender) {
1080                 keep_dirlinks = 0; /* Must be disabled on the sender. */
1081                 if (need_messages_from_generator)
1082                         io_start_multiplex_in(f_in);
1083                 else
1084                         io_start_buffering_in(f_in);
1085                 recv_filter_list(f_in);
1086                 do_server_sender(f_in, f_out, argc, argv);
1087         } else
1088                 do_server_recv(f_in, f_out, argc, argv);
1089         exit_cleanup(0);
1090 }
1091
1092 /* This is called once the connection has been negotiated.  It is used
1093  * for rsyncd, remote-shell, and local connections. */
1094 int client_run(int f_in, int f_out, pid_t pid, int argc, char *argv[])
1095 {
1096         struct file_list *flist = NULL;
1097         int exit_code = 0, exit_code2 = 0;
1098         char *local_name = NULL;
1099
1100         cleanup_child_pid = pid;
1101         if (!read_batch) {
1102                 set_nonblocking(f_in);
1103                 set_nonblocking(f_out);
1104         }
1105
1106         io_set_sock_fds(f_in, f_out);
1107         setup_protocol(f_out,f_in);
1108
1109         /* We set our stderr file handle to blocking because ssh might have
1110          * set it to non-blocking.  This can be particularly troublesome if
1111          * stderr is a clone of stdout, because ssh would have set our stdout
1112          * to non-blocking at the same time (which can easily cause us to lose
1113          * output from our print statements).  This kluge shouldn't cause ssh
1114          * any problems for how we use it.  Note also that we delayed setting
1115          * this until after the above protocol setup so that we know for sure
1116          * that ssh is done twiddling its file descriptors.  */
1117         set_blocking(STDERR_FILENO);
1118
1119         if (am_sender) {
1120                 keep_dirlinks = 0; /* Must be disabled on the sender. */
1121
1122                 if (always_checksum
1123                  && (log_format_has(stdout_format, 'C')
1124                   || log_format_has(logfile_format, 'C')))
1125                         sender_keeps_checksum = 1;
1126
1127                 if (protocol_version >= 30)
1128                         io_start_multiplex_out(f_out);
1129                 else
1130                         io_start_buffering_out(f_out);
1131                 if (protocol_version >= 31 || (!filesfrom_host && protocol_version >= 23))
1132                         io_start_multiplex_in(f_in);
1133                 else
1134                         io_start_buffering_in(f_in);
1135                 send_filter_list(f_out);
1136                 if (filesfrom_host)
1137                         filesfrom_fd = f_in;
1138
1139                 if (write_batch && !am_server)
1140                         start_write_batch(f_out);
1141                 flist = send_file_list(f_out, argc, argv);
1142                 if (DEBUG_GTE(FLIST, 3))
1143                         rprintf(FINFO,"file list sent\n");
1144
1145                 if (protocol_version < 31 && filesfrom_host && protocol_version >= 23)
1146                         io_start_multiplex_in(f_in);
1147
1148                 io_flush(NORMAL_FLUSH);
1149                 send_files(f_in, f_out);
1150                 io_flush(FULL_FLUSH);
1151                 handle_stats(-1);
1152                 if (protocol_version >= 24)
1153                         read_final_goodbye(f_in, f_out);
1154                 if (pid != -1) {
1155                         if (DEBUG_GTE(EXIT, 2))
1156                                 rprintf(FINFO,"client_run waiting on %d\n", (int) pid);
1157                         io_flush(FULL_FLUSH);
1158                         wait_process_with_flush(pid, &exit_code);
1159                 }
1160                 output_summary();
1161                 io_flush(FULL_FLUSH);
1162                 exit_cleanup(exit_code);
1163         }
1164
1165         if (!read_batch) {
1166                 if (protocol_version >= 23)
1167                         io_start_multiplex_in(f_in);
1168                 if (need_messages_from_generator)
1169                         io_start_multiplex_out(f_out);
1170                 else
1171                         io_start_buffering_out(f_out);
1172         }
1173
1174         send_filter_list(read_batch ? -1 : f_out);
1175
1176         if (filesfrom_fd >= 0) {
1177                 start_filesfrom_forwarding(filesfrom_fd);
1178                 filesfrom_fd = -1;
1179         }
1180
1181         if (write_batch && !am_server)
1182                 start_write_batch(f_in);
1183         flist = recv_file_list(f_in);
1184         if (inc_recurse && file_total == 1)
1185                 recv_additional_file_list(f_in);
1186
1187         if (flist && flist->used > 0) {
1188                 local_name = get_local_name(flist, argv[0]);
1189
1190                 check_alt_basis_dirs();
1191
1192                 exit_code2 = do_recv(f_in, f_out, local_name);
1193         } else {
1194                 handle_stats(-1);
1195                 output_summary();
1196         }
1197
1198         if (pid != -1) {
1199                 if (DEBUG_GTE(RECV, 1))
1200                         rprintf(FINFO,"client_run2 waiting on %d\n", (int) pid);
1201                 io_flush(FULL_FLUSH);
1202                 wait_process_with_flush(pid, &exit_code);
1203         }
1204
1205         return MAX(exit_code, exit_code2);
1206 }
1207
1208 static int copy_argv(char *argv[])
1209 {
1210         int i;
1211
1212         for (i = 0; argv[i]; i++) {
1213                 if (!(argv[i] = strdup(argv[i]))) {
1214                         rprintf (FERROR, "out of memory at %s(%d)\n",
1215                                  __FILE__, __LINE__);
1216                         return RERR_MALLOC;
1217                 }
1218         }
1219
1220         return 0;
1221 }
1222
1223
1224 /* Start a client for either type of remote connection.  Work out
1225  * whether the arguments request a remote shell or rsyncd connection,
1226  * and call the appropriate connection function, then run_client.
1227  *
1228  * Calls either start_socket_client (for sockets) or do_cmd and
1229  * client_run (for ssh). */
1230 static int start_client(int argc, char *argv[])
1231 {
1232         char *p, *shell_machine = NULL, *shell_user = NULL;
1233         char **remote_argv;
1234         int remote_argc;
1235         int f_in, f_out;
1236         int ret;
1237         pid_t pid;
1238
1239         /* Don't clobber argv[] so that ps(1) can still show the right
1240          * command line. */
1241         if ((ret = copy_argv(argv)) != 0)
1242                 return ret;
1243
1244         if (!read_batch) { /* for read_batch, NO source is specified */
1245                 char *path = check_for_hostspec(argv[0], &shell_machine, &rsync_port);
1246                 if (path) { /* source is remote */
1247                         char *dummy_host;
1248                         int dummy_port = 0;
1249                         *argv = path;
1250                         remote_argv = argv;
1251                         remote_argc = argc;
1252                         argv += argc - 1;
1253                         if (argc == 1 || **argv == ':')
1254                                 argc = 0; /* no dest arg */
1255                         else if (check_for_hostspec(*argv, &dummy_host, &dummy_port)) {
1256                                 rprintf(FERROR,
1257                                         "The source and destination cannot both be remote.\n");
1258                                 exit_cleanup(RERR_SYNTAX);
1259                         } else {
1260                                 remote_argc--; /* don't count dest */
1261                                 argc = 1;
1262                         }
1263                         if (filesfrom_host && *filesfrom_host
1264                             && strcmp(filesfrom_host, shell_machine) != 0) {
1265                                 rprintf(FERROR,
1266                                         "--files-from hostname is not the same as the transfer hostname\n");
1267                                 exit_cleanup(RERR_SYNTAX);
1268                         }
1269                         am_sender = 0;
1270                         if (rsync_port)
1271                                 daemon_over_rsh = shell_cmd ? 1 : -1;
1272                 } else { /* source is local, check dest arg */
1273                         am_sender = 1;
1274
1275                         if (argc > 1) {
1276                                 p = argv[--argc];
1277                                 remote_argv = argv + argc;
1278                         } else {
1279                                 static char *dotarg[1] = { "." };
1280                                 p = dotarg[0];
1281                                 remote_argv = dotarg;
1282                         }
1283                         remote_argc = 1;
1284
1285                         path = check_for_hostspec(p, &shell_machine, &rsync_port);
1286                         if (path && filesfrom_host && *filesfrom_host
1287                             && strcmp(filesfrom_host, shell_machine) != 0) {
1288                                 rprintf(FERROR,
1289                                         "--files-from hostname is not the same as the transfer hostname\n");
1290                                 exit_cleanup(RERR_SYNTAX);
1291                         }
1292                         if (!path) { /* no hostspec found, so src & dest are local */
1293                                 local_server = 1;
1294                                 if (filesfrom_host) {
1295                                         rprintf(FERROR,
1296                                                 "--files-from cannot be remote when the transfer is local\n");
1297                                         exit_cleanup(RERR_SYNTAX);
1298                                 }
1299                                 shell_machine = NULL;
1300                         } else { /* hostspec was found, so dest is remote */
1301                                 argv[argc] = path;
1302                                 if (rsync_port)
1303                                         daemon_over_rsh = shell_cmd ? 1 : -1;
1304                         }
1305                 }
1306         } else {  /* read_batch */
1307                 local_server = 1;
1308                 if (check_for_hostspec(argv[argc-1], &shell_machine, &rsync_port)) {
1309                         rprintf(FERROR, "remote destination is not allowed with --read-batch\n");
1310                         exit_cleanup(RERR_SYNTAX);
1311                 }
1312                 remote_argv = argv += argc - 1;
1313                 remote_argc = argc = 1;
1314         }
1315
1316         if (am_sender) {
1317                 char *dummy_host;
1318                 int dummy_port = rsync_port;
1319                 int i;
1320                 /* For local source, extra source args must not have hostspec. */
1321                 for (i = 1; i < argc; i++) {
1322                         if (check_for_hostspec(argv[i], &dummy_host, &dummy_port)) {
1323                                 rprintf(FERROR, "Unexpected remote arg: %s\n", argv[i]);
1324                                 exit_cleanup(RERR_SYNTAX);
1325                         }
1326                 }
1327         } else {
1328                 char *dummy_host;
1329                 int dummy_port = rsync_port;
1330                 int i;
1331                 /* For remote source, any extra source args must have either
1332                  * the same hostname or an empty hostname. */
1333                 for (i = 1; i < remote_argc; i++) {
1334                         char *arg = check_for_hostspec(remote_argv[i], &dummy_host, &dummy_port);
1335                         if (!arg) {
1336                                 rprintf(FERROR, "Unexpected local arg: %s\n", remote_argv[i]);
1337                                 rprintf(FERROR, "If arg is a remote file/dir, prefix it with a colon (:).\n");
1338                                 exit_cleanup(RERR_SYNTAX);
1339                         }
1340                         if (*dummy_host && strcmp(dummy_host, shell_machine) != 0) {
1341                                 rprintf(FERROR, "All source args must come from the same machine.\n");
1342                                 exit_cleanup(RERR_SYNTAX);
1343                         }
1344                         if (rsync_port != dummy_port) {
1345                                 if (!rsync_port || !dummy_port)
1346                                         rprintf(FERROR, "All source args must use the same hostspec format.\n");
1347                                 else
1348                                         rprintf(FERROR, "All source args must use the same port number.\n");
1349                                 exit_cleanup(RERR_SYNTAX);
1350                         }
1351                         remote_argv[i] = arg;
1352                 }
1353         }
1354
1355         if (daemon_over_rsh < 0)
1356                 return start_socket_client(shell_machine, remote_argc, remote_argv, argc, argv);
1357
1358         if (password_file && !daemon_over_rsh) {
1359                 rprintf(FERROR, "The --password-file option may only be "
1360                                 "used when accessing an rsync daemon.\n");
1361                 exit_cleanup(RERR_SYNTAX);
1362         }
1363
1364         if (connect_timeout) {
1365                 rprintf(FERROR, "The --contimeout option may only be "
1366                                 "used when connecting to an rsync daemon.\n");
1367                 exit_cleanup(RERR_SYNTAX);
1368         }
1369
1370         if (shell_machine) {
1371                 p = strrchr(shell_machine,'@');
1372                 if (p) {
1373                         *p = 0;
1374                         shell_user = shell_machine;
1375                         shell_machine = p+1;
1376                 }
1377         }
1378
1379         if (DEBUG_GTE(CMD, 2)) {
1380                 rprintf(FINFO,"cmd=%s machine=%s user=%s path=%s\n",
1381                         NS(shell_cmd), NS(shell_machine), NS(shell_user),
1382                         NS(remote_argv[0]));
1383         }
1384
1385         pid = do_cmd(shell_cmd, shell_machine, shell_user, remote_argv, remote_argc,
1386                      &f_in, &f_out);
1387
1388         /* if we're running an rsync server on the remote host over a
1389          * remote shell command, we need to do the RSYNCD protocol first */
1390         if (daemon_over_rsh) {
1391                 int tmpret;
1392                 tmpret = start_inband_exchange(f_in, f_out, shell_user, remote_argc, remote_argv);
1393                 if (tmpret < 0)
1394                         return tmpret;
1395         }
1396
1397         ret = client_run(f_in, f_out, pid, argc, argv);
1398
1399         fflush(stdout);
1400         fflush(stderr);
1401
1402         return ret;
1403 }
1404
1405
1406 static RETSIGTYPE sigusr1_handler(UNUSED(int val))
1407 {
1408         exit_cleanup(RERR_SIGNAL1);
1409 }
1410
1411 static RETSIGTYPE sigusr2_handler(UNUSED(int val))
1412 {
1413         if (!am_server)
1414                 output_summary();
1415         close_all();
1416         if (got_xfer_error)
1417                 _exit(RERR_PARTIAL);
1418         _exit(0);
1419 }
1420
1421 RETSIGTYPE remember_children(UNUSED(int val))
1422 {
1423 #ifdef WNOHANG
1424         int cnt, status;
1425         pid_t pid;
1426         /* An empty waitpid() loop was put here by Tridge and we could never
1427          * get him to explain why he put it in, so rather than taking it
1428          * out we're instead saving the child exit statuses for later use.
1429          * The waitpid() loop presumably eliminates all possibility of leaving
1430          * zombie children, maybe that's why he did it. */
1431         while ((pid = waitpid(-1, &status, WNOHANG)) > 0) {
1432                 /* save the child's exit status */
1433                 for (cnt = 0; cnt < MAXCHILDPROCS; cnt++) {
1434                         if (pid_stat_table[cnt].pid == 0) {
1435                                 pid_stat_table[cnt].pid = pid;
1436                                 pid_stat_table[cnt].status = status;
1437                                 break;
1438                         }
1439                 }
1440         }
1441 #endif
1442 #ifndef HAVE_SIGACTION
1443         signal(SIGCHLD, remember_children);
1444 #endif
1445 }
1446
1447
1448 /**
1449  * This routine catches signals and tries to send them to gdb.
1450  *
1451  * Because it's called from inside a signal handler it ought not to
1452  * use too many library routines.
1453  *
1454  * @todo Perhaps use "screen -X" instead/as well, to help people
1455  * debugging without easy access to X.  Perhaps use an environment
1456  * variable, or just call a script?
1457  *
1458  * @todo The /proc/ magic probably only works on Linux (and
1459  * Solaris?)  Can we be more portable?
1460  **/
1461 #ifdef MAINTAINER_MODE
1462 const char *get_panic_action(void)
1463 {
1464         const char *cmd_fmt = getenv("RSYNC_PANIC_ACTION");
1465
1466         if (cmd_fmt)
1467                 return cmd_fmt;
1468         else
1469                 return "xterm -display :0 -T Panic -n Panic "
1470                         "-e gdb /proc/%d/exe %d";
1471 }
1472
1473
1474 /**
1475  * Handle a fatal signal by launching a debugger, controlled by $RSYNC_PANIC_ACTION.
1476  *
1477  * This signal handler is only installed if we were configured with
1478  * --enable-maintainer-mode.  Perhaps it should always be on and we
1479  * should just look at the environment variable, but I'm a bit leery
1480  * of a signal sending us into a busy loop.
1481  **/
1482 static RETSIGTYPE rsync_panic_handler(UNUSED(int whatsig))
1483 {
1484         char cmd_buf[300];
1485         int ret;
1486
1487         snprintf(cmd_buf, sizeof cmd_buf, get_panic_action(),
1488                  getpid(), getpid());
1489
1490         /* Unless we failed to execute gdb, we allow the process to
1491          * continue.  I'm not sure if that's right. */
1492         ret = system(cmd_buf);
1493         if (ret)
1494                 _exit(ret);
1495 }
1496 #endif
1497
1498
1499 int main(int argc,char *argv[])
1500 {
1501         int ret;
1502         int orig_argc = argc;
1503         char **orig_argv = argv;
1504 #ifdef HAVE_SIGACTION
1505 # ifdef HAVE_SIGPROCMASK
1506         sigset_t sigmask;
1507
1508         sigemptyset(&sigmask);
1509 # endif
1510         sigact.sa_flags = SA_NOCLDSTOP;
1511 #endif
1512         SIGACTMASK(SIGUSR1, sigusr1_handler);
1513         SIGACTMASK(SIGUSR2, sigusr2_handler);
1514         SIGACTMASK(SIGCHLD, remember_children);
1515 #ifdef MAINTAINER_MODE
1516         SIGACTMASK(SIGSEGV, rsync_panic_handler);
1517         SIGACTMASK(SIGFPE, rsync_panic_handler);
1518         SIGACTMASK(SIGABRT, rsync_panic_handler);
1519         SIGACTMASK(SIGBUS, rsync_panic_handler);
1520 #endif
1521
1522         starttime = time(NULL);
1523         our_uid = MY_UID();
1524         our_gid = MY_GID();
1525         am_root = our_uid == 0;
1526
1527         memset(&stats, 0, sizeof(stats));
1528
1529         if (argc < 2) {
1530                 usage(FERROR);
1531                 exit_cleanup(RERR_SYNTAX);
1532         }
1533
1534         /* Get the umask for use in permission calculations.  We no longer set
1535          * it to zero; that is ugly and pointless now that all the callers that
1536          * relied on it have been reeducated to work with default ACLs. */
1537         umask(orig_umask = umask(0));
1538
1539 #if defined CONFIG_LOCALE && defined HAVE_SETLOCALE
1540         setlocale(LC_CTYPE, "");
1541 #endif
1542
1543         if (!parse_arguments(&argc, (const char ***) &argv)) {
1544                 /* FIXME: We ought to call the same error-handling
1545                  * code here, rather than relying on getopt. */
1546                 option_error();
1547                 exit_cleanup(RERR_SYNTAX);
1548         }
1549
1550         SIGACTMASK(SIGINT, sig_int);
1551         SIGACTMASK(SIGHUP, sig_int);
1552         SIGACTMASK(SIGTERM, sig_int);
1553 #if defined HAVE_SIGACTION && HAVE_SIGPROCMASK
1554         sigprocmask(SIG_UNBLOCK, &sigmask, NULL);
1555 #endif
1556
1557         /* Ignore SIGPIPE; we consistently check error codes and will
1558          * see the EPIPE. */
1559         SIGACTION(SIGPIPE, SIG_IGN);
1560 #ifdef SIGXFSZ
1561         SIGACTION(SIGXFSZ, SIG_IGN);
1562 #endif
1563
1564         /* Initialize change_dir() here because on some old systems getcwd
1565          * (implemented by forking "pwd" and reading its output) doesn't
1566          * work when there are other child processes.  Also, on all systems
1567          * that implement getcwd that way "pwd" can't be found after chroot. */
1568         change_dir(NULL, CD_NORMAL);
1569
1570         init_flist();
1571
1572         if ((write_batch || read_batch) && !am_server) {
1573                 if (write_batch)
1574                         write_batch_shell_file(orig_argc, orig_argv, argc);
1575
1576                 if (read_batch && strcmp(batch_name, "-") == 0)
1577                         batch_fd = STDIN_FILENO;
1578                 else {
1579                         batch_fd = do_open(batch_name,
1580                                    write_batch ? O_WRONLY | O_CREAT | O_TRUNC
1581                                    : O_RDONLY, S_IRUSR | S_IWUSR);
1582                 }
1583                 if (batch_fd < 0) {
1584                         rsyserr(FERROR, errno, "Batch file %s open error",
1585                                 full_fname(batch_name));
1586                         exit_cleanup(RERR_FILEIO);
1587                 }
1588                 if (read_batch)
1589                         read_stream_flags(batch_fd);
1590                 else
1591                         write_stream_flags(batch_fd);
1592         }
1593         if (write_batch < 0)
1594                 dry_run = 1;
1595
1596         if (am_server) {
1597 #ifdef ICONV_CONST
1598                 setup_iconv();
1599 #endif
1600         } else if (am_daemon)
1601                 return daemon_main();
1602
1603         if (am_server && protect_args) {
1604                 char buf[MAXPATHLEN];
1605                 protect_args = 2;
1606                 read_args(STDIN_FILENO, NULL, buf, sizeof buf, 1, &argv, &argc, NULL);
1607                 if (!parse_arguments(&argc, (const char ***) &argv)) {
1608                         option_error();
1609                         exit_cleanup(RERR_SYNTAX);
1610                 }
1611         }
1612
1613         if (argc < 1) {
1614                 usage(FERROR);
1615                 exit_cleanup(RERR_SYNTAX);
1616         }
1617
1618         if (am_server) {
1619                 set_nonblocking(STDIN_FILENO);
1620                 set_nonblocking(STDOUT_FILENO);
1621                 if (am_daemon)
1622                         return start_daemon(STDIN_FILENO, STDOUT_FILENO);
1623                 start_server(STDIN_FILENO, STDOUT_FILENO, argc, argv);
1624         }
1625
1626         ret = start_client(argc, argv);
1627         if (ret == -1)
1628                 exit_cleanup(RERR_STARTCLIENT);
1629         else
1630                 exit_cleanup(ret);
1631
1632         return ret;
1633 }