main.c

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