main.c

   1 /*
   2  * The startup routines, including main(), for rsync.
   3  *
   4  * Copyright (C) 1996-2001 Andrew Tridgell <tridge@samba.org>
   5  * Copyright (C) 1996 Paul Mackerras
   6  * Copyright (C) 2001, 2002 Martin Pool <mbp@samba.org>
   7  * Copyright (C) 2003-2009 Wayne Davison
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 3 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License along
  20  * with this program; if not, visit the http://fsf.org website.
  21  */
  22
  23 #include "rsync.h"
  24 #include "inums.h"
  25 #include "io.h"
  26 #if defined CONFIG_LOCALE && defined HAVE_LOCALE_H
  27 #include <locale.h>
  28 #endif
  29
  30 extern int dry_run;
  31 extern int list_only;
  32 extern int io_timeout;
  33 extern int am_root;
  34 extern int am_server;
  35 extern int am_sender;
  36 extern int am_daemon;
  37 extern int inc_recurse;
  38 extern int blocking_io;
  39 extern int always_checksum;
  40 extern int remove_source_files;
  41 extern int output_needs_newline;
  42 extern int need_messages_from_generator;
  43 extern int kluge_around_eof;
  44 extern int got_xfer_error;
  45 extern int msgs2stderr;
  46 extern int module_id;
  47 extern int read_only;
  48 extern int copy_links;
  49 extern int copy_dirlinks;
  50 extern int copy_unsafe_links;
  51 extern int keep_dirlinks;
  52 extern int preserve_hard_links;
  53 extern int protocol_version;
  54 extern int file_total;
  55 extern int recurse;
  56 extern int xfer_dirs;
  57 extern int protect_args;
  58 extern int relative_paths;
  59 extern int sanitize_paths;
  60 extern int curr_dir_depth;
  61 extern int curr_dir_len;
  62 extern int module_id;
  63 extern int rsync_port;
  64 extern int whole_file;
  65 extern int read_batch;
  66 extern int write_batch;
  67 extern int batch_fd;
  68 extern int sock_f_in;
  69 extern int sock_f_out;
  70 extern int filesfrom_fd;
  71 extern int connect_timeout;
  72 extern int send_msgs_to_gen;
  73 extern pid_t cleanup_child_pid;
  74 extern size_t bwlimit_writemax;
  75 extern unsigned int module_dirlen;
  76 extern BOOL flist_receiving_enabled;
  77 extern BOOL shutting_down;
  78 extern struct stats stats;
  79 extern char *stdout_format;
  80 extern char *logfile_format;
  81 extern char *filesfrom_host;
  82 extern char *partial_dir;
  83 extern char *dest_option;
  84 extern char *rsync_path;
  85 extern char *shell_cmd;
  86 extern char *batch_name;
  87 extern char *password_file;
  88 extern char *backup_dir;
  89 extern char curr_dir[MAXPATHLEN];
  90 extern char backup_dir_buf[MAXPATHLEN];
  91 extern char *basis_dir[MAX_BASIS_DIRS+1];
  92 extern struct file_list *first_flist;
  93 extern filter_rule_list daemon_filter_list;
  94
  95 uid_t our_uid;
  96 gid_t our_gid;
  97 int am_generator = 0;
  98 int local_server = 0;
  99 int daemon_over_rsh = 0;
 100 mode_t orig_umask = 0;
 101 int batch_gen_fd = -1;
 102 int sender_keeps_checksum = 0;
 103
 104 /* There's probably never more than at most 2 outstanding child processes,
 105  * but set it higher, just in case. */
 106 #define MAXCHILDPROCS 7
 107
 108 #ifdef HAVE_SIGACTION
 109 # ifdef HAVE_SIGPROCMASK
 110 #  define SIGACTMASK(n,h) SIGACTION(n,h), sigaddset(&sigmask,(n))
 111 # else
 112 #  define SIGACTMASK(n,h) SIGACTION(n,h)
 113 # endif
 114 static struct sigaction sigact;
 115 #endif
 116
 117 struct pid_status {
 118         pid_t pid;
 119         int status;
 120 } pid_stat_table[MAXCHILDPROCS];
 121
 122 static time_t starttime, endtime;
 123 static int64 total_read, total_written;
 124
 125 static void show_malloc_stats(void);
 126
 127 /* Works like waitpid(), but if we already harvested the child pid in our
 128  * remember_children(), we succeed instead of returning an error. */
 129 pid_t wait_process(pid_t pid, int *status_ptr, int flags)
 130 {
 131         pid_t waited_pid;
 132
 133         do {
 134                 waited_pid = waitpid(pid, status_ptr, flags);
 135         } while (waited_pid == -1 && errno == EINTR);
 136
 137         if (waited_pid == -1 && errno == ECHILD) {
 138                 /* Status of requested child no longer available:  check to
 139                  * see if it was processed by remember_children(). */
 140                 int cnt;
 141                 for (cnt = 0; cnt < MAXCHILDPROCS; cnt++) {
 142                         if (pid == pid_stat_table[cnt].pid) {
 143                                 *status_ptr = pid_stat_table[cnt].status;
 144                                 pid_stat_table[cnt].pid = 0;
 145                                 return pid;
 146                         }
 147                 }
 148         }
 149
 150         return waited_pid;
 151 }
 152
 153 /* Wait for a process to exit, calling io_flush while waiting. */
 154 static void wait_process_with_flush(pid_t pid, int *exit_code_ptr)
 155 {
 156         pid_t waited_pid;
 157         int status;
 158
 159         while ((waited_pid = wait_process(pid, &status, WNOHANG)) == 0) {
 160                 msleep(20);
 161                 io_flush(FULL_FLUSH);
 162         }
 163
 164         /* TODO: If the child exited on a signal, then log an
 165          * appropriate error message.  Perhaps we should also accept a
 166          * message describing the purpose of the child.  Also indicate
 167          * this to the caller so that they know something went wrong. */
 168         if (waited_pid < 0) {
 169                 rsyserr(FERROR, errno, "waitpid");
 170                 *exit_code_ptr = RERR_WAITCHILD;
 171         } else if (!WIFEXITED(status)) {
 172 #ifdef WCOREDUMP
 173                 if (WCOREDUMP(status))
 174                         *exit_code_ptr = RERR_CRASHED;
 175                 else
 176 #endif
 177                 if (WIFSIGNALED(status))
 178                         *exit_code_ptr = RERR_TERMINATED;
 179                 else
 180                         *exit_code_ptr = RERR_WAITCHILD;
 181         } else
 182                 *exit_code_ptr = WEXITSTATUS(status);
 183 }
 184
 185 void write_del_stats(int f)
 186 {
 187         if (read_batch)
 188                 write_int(f, NDX_DEL_STATS);
 189         else
 190                 write_ndx(f, NDX_DEL_STATS);
 191         write_varint(f, stats.deleted_files - stats.deleted_dirs
 192                       - stats.deleted_symlinks - stats.deleted_devices
 193                       - stats.deleted_specials);
 194         write_varint(f, stats.deleted_dirs);
 195         write_varint(f, stats.deleted_symlinks);
 196         write_varint(f, stats.deleted_devices);
 197         write_varint(f, stats.deleted_specials);
 198 }
 199
 200 void read_del_stats(int f)
 201 {
 202         stats.deleted_files = read_varint(f);
 203         stats.deleted_files += stats.deleted_dirs = read_varint(f);
 204         stats.deleted_files += stats.deleted_symlinks = read_varint(f);
 205         stats.deleted_files += stats.deleted_devices = read_varint(f);
 206         stats.deleted_files += stats.deleted_specials = read_varint(f);
 207 }
 208
 209 /* This function gets called from all 3 processes.  We want the client side
 210  * to actually output the text, but the sender is the only process that has
 211  * all the stats we need.  So, if we're a client sender, we do the report.
 212  * If we're a server sender, we write the stats on the supplied fd.  If
 213  * we're the client receiver we read the stats from the supplied fd and do
 214  * the report.  All processes might also generate a set of debug stats, if
 215  * the verbose level is high enough (this is the only thing that the
 216  * generator process and the server receiver ever do here). */
 217 static void handle_stats(int f)
 218 {
 219         endtime = time(NULL);
 220
 221         /* Cache two stats because the read/write code can change it. */
 222         total_read = stats.total_read;
 223         total_written = stats.total_written;
 224
 225         if (INFO_GTE(STATS, 3)) {
 226                 /* These come out from every process */
 227                 show_malloc_stats();
 228                 show_flist_stats();
 229         }
 230
 231         if (am_generator)
 232                 return;
 233
 234         if (am_daemon) {
 235                 if (f == -1 || !am_sender)
 236                         return;
 237         }
 238
 239         if (am_server) {
 240                 if (am_sender) {
 241                         write_varlong30(f, total_read, 3);
 242                         write_varlong30(f, total_written, 3);
 243                         write_varlong30(f, stats.total_size, 3);
 244                         if (protocol_version >= 29) {
 245                                 write_varlong30(f, stats.flist_buildtime, 3);
 246                                 write_varlong30(f, stats.flist_xfertime, 3);
 247                         }
 248                 }
 249                 return;
 250         }
 251
 252         /* this is the client */
 253
 254         if (f < 0 && !am_sender) /* e.g. when we got an empty file list. */
 255                 ;
 256         else if (!am_sender) {
 257                 /* Read the first two in opposite order because the meaning of
 258                  * read/write swaps when switching from sender to receiver. */
 259                 total_written = read_varlong30(f, 3);
 260                 total_read = read_varlong30(f, 3);
 261                 stats.total_size = read_varlong30(f, 3);
 262                 if (protocol_version >= 29) {
 263                         stats.flist_buildtime = read_varlong30(f, 3);
 264                         stats.flist_xfertime = read_varlong30(f, 3);
 265                 }
 266         } else if (write_batch) {
 267                 /* The --read-batch process is going to be a client
 268                  * receiver, so we need to give it the stats. */
 269                 write_varlong30(batch_fd, total_read, 3);
 270                 write_varlong30(batch_fd, total_written, 3);
 271                 write_varlong30(batch_fd, stats.total_size, 3);
 272                 if (protocol_version >= 29) {
 273                         write_varlong30(batch_fd, stats.flist_buildtime, 3);
 274                         write_varlong30(batch_fd, stats.flist_xfertime, 3);
 275                 }
 276         }
 277 }
 278
 279 static void output_itemized_counts(const char *prefix, int *counts)
 280 {
 281         static char *labels[] = { "reg", "dir", "link", "dev", "special" };
 282         char buf[1024], *pre = " (";
 283         int j, len = 0;
 284         int total = counts[0];
 285         if (total) {
 286                 counts[0] -= counts[1] + counts[2] + counts[3] + counts[4];
 287                 for (j = 0; j < 5; j++) {
 288                         if (counts[j]) {
 289                                 len += snprintf(buf+len, sizeof buf - len - 2,
 290                                         "%s%s: %s",
 291                                         pre, labels[j], comma_num(counts[j]));
 292                                 pre = ", ";
 293                         }
 294                 }
 295                 buf[len++] = ')';
 296         }
 297         buf[len] = '\0';
 298         rprintf(FINFO, "%s: %s%s\n", prefix, comma_num(total), buf);
 299 }
 300
 301 static void output_summary(void)
 302 {
 303         if (INFO_GTE(STATS, 2)) {
 304                 rprintf(FCLIENT, "\n");
 305                 output_itemized_counts("Number of files", &stats.num_files);
 306                 if (protocol_version >= 29)
 307                         output_itemized_counts("Number of created files", &stats.created_files);
 308                 if (protocol_version >= 31)
 309                         output_itemized_counts("Number of deleted files", &stats.deleted_files);
 310                 rprintf(FINFO,"Number of regular files transferred: %s\n",
 311                         comma_num(stats.xferred_files));
 312                 rprintf(FINFO,"Total file size: %s bytes\n",
 313                         human_num(stats.total_size));
 314                 rprintf(FINFO,"Total transferred file size: %s bytes\n",
 315                         human_num(stats.total_transferred_size));
 316                 rprintf(FINFO,"Literal data: %s bytes\n",
 317                         human_num(stats.literal_data));
 318                 rprintf(FINFO,"Matched data: %s bytes\n",
 319                         human_num(stats.matched_data));
 320                 rprintf(FINFO,"File list size: %s\n",
 321                         human_num(stats.flist_size));
 322                 if (stats.flist_buildtime) {
 323                         rprintf(FINFO,
 324                                 "File list generation time: %s seconds\n",
 325                                 comma_dnum((double)stats.flist_buildtime / 1000, 3));
 326                         rprintf(FINFO,
 327                                 "File list transfer time: %s seconds\n",
 328                                 comma_dnum((double)stats.flist_xfertime / 1000, 3));
 329                 }
 330                 rprintf(FINFO,"Total bytes sent: %s\n",
 331                         human_num(total_written));
 332                 rprintf(FINFO,"Total bytes received: %s\n",
 333                         human_num(total_read));
 334         }
 335
 336         if (INFO_GTE(STATS, 1)) {
 337                 rprintf(FCLIENT, "\n");
 338                 rprintf(FINFO,
 339                         "sent %s bytes  received %s bytes  %s bytes/sec\n",
 340                         human_num(total_written), human_num(total_read),
 341                         human_dnum((total_written + total_read)/(0.5 + (endtime - starttime)), 2));
 342                 rprintf(FINFO, "total size is %s  speedup is %s%s\n",
 343                         human_num(stats.total_size),
 344                         comma_dnum((double)stats.total_size / (total_written+total_read), 2),
 345                         write_batch < 0 ? " (BATCH ONLY)" : dry_run ? " (DRY RUN)" : "");
 346         }
 347
 348         fflush(stdout);
 349         fflush(stderr);
 350 }
 351
 352
 353 /**
 354  * If our C library can get malloc statistics, then show them to FINFO
 355  **/
 356 static void show_malloc_stats(void)
 357 {
 358 #ifdef HAVE_MALLINFO
 359         struct mallinfo mi;
 360
 361         mi = mallinfo();
 362
 363         rprintf(FCLIENT, "\n");
 364         rprintf(FINFO, RSYNC_NAME "[%d] (%s%s%s) heap statistics:\n",
 365                 getpid(), am_server ? "server " : "",
 366                 am_daemon ? "daemon " : "", who_am_i());
 367         rprintf(FINFO, "  arena:     %10ld   (bytes from sbrk)\n",
 368                 (long)mi.arena);
 369         rprintf(FINFO, "  ordblks:   %10ld   (chunks not in use)\n",
 370                 (long)mi.ordblks);
 371         rprintf(FINFO, "  smblks:    %10ld\n",
 372                 (long)mi.smblks);
 373         rprintf(FINFO, "  hblks:     %10ld   (chunks from mmap)\n",
 374                 (long)mi.hblks);
 375         rprintf(FINFO, "  hblkhd:    %10ld   (bytes from mmap)\n",
 376                 (long)mi.hblkhd);
 377         rprintf(FINFO, "  allmem:    %10ld   (bytes from sbrk + mmap)\n",
 378                 (long)mi.arena + mi.hblkhd);
 379         rprintf(FINFO, "  usmblks:   %10ld\n",
 380                 (long)mi.usmblks);
 381         rprintf(FINFO, "  fsmblks:   %10ld\n",
 382                 (long)mi.fsmblks);
 383         rprintf(FINFO, "  uordblks:  %10ld   (bytes used)\n",
 384                 (long)mi.uordblks);
 385         rprintf(FINFO, "  fordblks:  %10ld   (bytes free)\n",
 386                 (long)mi.fordblks);
 387         rprintf(FINFO, "  keepcost:  %10ld   (bytes in releasable chunk)\n",
 388                 (long)mi.keepcost);
 389 #endif /* HAVE_MALLINFO */
 390 }
 391
 392
 393 /* Start the remote shell.   cmd may be NULL to use the default. */
 394 static pid_t do_cmd(char *cmd, char *machine, char *user, char **remote_argv, int remote_argc,
 395                     int *f_in_p, int *f_out_p)
 396 {
 397         int i, argc = 0;
 398         char *args[MAX_ARGS];
 399         pid_t pid;
 400         int dash_l_set = 0;
 401
 402         if (!read_batch && !local_server) {
 403                 char *t, *f, in_quote = '\0';
 404                 char *rsh_env = getenv(RSYNC_RSH_ENV);
 405                 if (!cmd)
 406                         cmd = rsh_env;
 407                 if (!cmd)
 408                         cmd = RSYNC_RSH;
 409                 cmd = strdup(cmd); /*MEMORY LEAK*/
 410                 if (!cmd)
 411                         goto oom;
 412
 413                 for (t = f = cmd; *f; f++) {
 414                         if (*f == ' ')
 415                                 continue;
 416                         /* Comparison leaves rooms for server_options(). */
 417                         if (argc >= MAX_ARGS - MAX_SERVER_ARGS)
 418                                 goto arg_overflow;
 419                         args[argc++] = t;
 420                         while (*f != ' ' || in_quote) {
 421                                 if (!*f) {
 422                                         if (in_quote) {
 423                                                 rprintf(FERROR,
 424                                                     "Missing trailing-%c in remote-shell command.\n",
 425                                                     in_quote);
 426                                                 exit_cleanup(RERR_SYNTAX);
 427                                         }
 428                                         f--;
 429                                         break;
 430                                 }
 431                                 if (*f == '\'' || *f == '"') {
 432                                         if (!in_quote) {
 433                                                 in_quote = *f++;
 434                                                 continue;
 435                                         }
 436                                         if (*f == in_quote && *++f != in_quote) {
 437                                                 in_quote = '\0';
 438                                                 continue;
 439                                         }
 440                                 }
 441                                 *t++ = *f++;
 442                         }
 443                         *t++ = '\0';
 444                 }
 445
 446                 /* check to see if we've already been given '-l user' in
 447                  * the remote-shell command */
 448                 for (i = 0; i < argc-1; i++) {
 449                         if (!strcmp(args[i], "-l") && args[i+1][0] != '-')
 450                                 dash_l_set = 1;
 451                 }
 452
 453 #ifdef HAVE_REMSH
 454                 /* remsh (on HPUX) takes the arguments the other way around */
 455                 args[argc++] = machine;
 456                 if (user && !(daemon_over_rsh && dash_l_set)) {
 457                         args[argc++] = "-l";
 458                         args[argc++] = user;
 459                 }
 460 #else
 461                 if (user && !(daemon_over_rsh && dash_l_set)) {
 462                         args[argc++] = "-l";
 463                         args[argc++] = user;
 464                 }
 465                 args[argc++] = machine;
 466 #endif
 467
 468                 args[argc++] = rsync_path;
 469
 470                 if (blocking_io < 0) {
 471                         char *cp;
 472                         if ((cp = strrchr(cmd, '/')) != NULL)
 473                                 cp++;
 474                         else
 475                                 cp = cmd;
 476                         if (strcmp(cp, "rsh") == 0 || strcmp(cp, "remsh") == 0)
 477                                 blocking_io = 1;
 478                 }
 479
 480                 server_options(args,&argc);
 481
 482                 if (argc >= MAX_ARGS - 2)
 483                         goto arg_overflow;
 484         }
 485
 486         args[argc++] = ".";
 487
 488         if (!daemon_over_rsh) {
 489                 while (remote_argc > 0) {
 490                         if (argc >= MAX_ARGS - 1) {
 491                           arg_overflow:
 492                                 rprintf(FERROR, "internal: args[] overflowed in do_cmd()\n");
 493                                 exit_cleanup(RERR_SYNTAX);
 494                         }
 495                         args[argc++] = *remote_argv++;
 496                         remote_argc--;
 497                 }
 498         }
 499
 500         args[argc] = NULL;
 501
 502         if (DEBUG_GTE(CMD, 2)) {
 503                 for (i = 0; i < argc; i++)
 504                         rprintf(FCLIENT, "cmd[%d]=%s ", i, args[i]);
 505                 rprintf(FCLIENT, "\n");
 506         }
 507
 508         if (read_batch) {
 509                 int from_gen_pipe[2];
 510                 set_allow_inc_recurse();
 511                 if (fd_pair(from_gen_pipe) < 0) {
 512                         rsyserr(FERROR, errno, "pipe");
 513                         exit_cleanup(RERR_IPC);
 514                 }
 515                 batch_gen_fd = from_gen_pipe[0];
 516                 *f_out_p = from_gen_pipe[1];
 517                 *f_in_p = batch_fd;
 518                 pid = (pid_t)-1; /* no child pid */
 519 #ifdef ICONV_CONST
 520                 setup_iconv();
 521 #endif
 522         } else if (local_server) {
 523                 /* If the user didn't request --[no-]whole-file, force
 524                  * it on, but only if we're not batch processing. */
 525                 if (whole_file < 0 && !write_batch)
 526                         whole_file = 1;
 527                 set_allow_inc_recurse();
 528                 pid = local_child(argc, args, f_in_p, f_out_p, child_main);
 529 #ifdef ICONV_CONST
 530                 setup_iconv();
 531 #endif
 532         } else {
 533                 pid = piped_child(args, f_in_p, f_out_p);
 534 #ifdef ICONV_CONST
 535                 setup_iconv();
 536 #endif
 537                 if (protect_args && !daemon_over_rsh)
 538                         send_protected_args(*f_out_p, args);
 539         }
 540
 541         return pid;
 542
 543   oom:
 544         out_of_memory("do_cmd");
 545         return 0; /* not reached */
 546 }
 547
 548 /* The receiving side operates in one of two modes:
 549  *
 550  * 1. it receives any number of files into a destination directory,
 551  * placing them according to their names in the file-list.
 552  *
 553  * 2. it receives a single file and saves it using the name in the
 554  * destination path instead of its file-list name.  This requires a
 555  * "local name" for writing out the destination file.
 556  *
 557  * So, our task is to figure out what mode/local-name we need.
 558  * For mode 1, we change into the destination directory and return NULL.
 559  * For mode 2, we change into the directory containing the destination
 560  * file (if we aren't already there) and return the local-name. */
 561 static char *get_local_name(struct file_list *flist, char *dest_path)
 562 {
 563         STRUCT_STAT st;
 564         int statret;
 565         char *cp;
 566
 567         if (DEBUG_GTE(RECV, 1)) {
 568                 rprintf(FINFO, "get_local_name count=%d %s\n",
 569                         file_total, NS(dest_path));
 570         }
 571
 572         if (!dest_path || list_only)
 573                 return NULL;
 574
 575         if (daemon_filter_list.head) {
 576                 char *slash = strrchr(dest_path, '/');
 577                 if (slash && (slash[1] == '\0' || (slash[1] == '.' && slash[2] == '\0')))
 578                         *slash = '\0';
 579                 else
 580                         slash = NULL;
 581                 if ((*dest_path != '.' || dest_path[1] != '\0')
 582                  && (check_filter(&daemon_filter_list, FLOG, dest_path, 0) < 0
 583                   || check_filter(&daemon_filter_list, FLOG, dest_path, 1) < 0)) {
 584                         rprintf(FERROR, "skipping daemon-excluded destination \"%s\"\n",
 585                                 dest_path);
 586                         exit_cleanup(RERR_FILESELECT);
 587                 }
 588                 if (slash)
 589                         *slash = '/';
 590         }
 591
 592         /* See what currently exists at the destination. */
 593         if ((statret = do_stat(dest_path, &st)) == 0) {
 594                 /* If the destination is a dir, enter it and use mode 1. */
 595                 if (S_ISDIR(st.st_mode)) {
 596                         if (!change_dir(dest_path, CD_NORMAL)) {
 597                                 rsyserr(FERROR, errno, "change_dir#1 %s failed",
 598                                         full_fname(dest_path));
 599                                 exit_cleanup(RERR_FILESELECT);
 600                         }
 601                         return NULL;
 602                 }
 603                 if (file_total > 1) {
 604                         rprintf(FERROR,
 605                                 "ERROR: destination must be a directory when"
 606                                 " copying more than 1 file\n");
 607                         exit_cleanup(RERR_FILESELECT);
 608                 }
 609                 if (file_total == 1 && S_ISDIR(flist->files[0]->mode)) {
 610                         rprintf(FERROR,
 611                                 "ERROR: cannot overwrite non-directory"
 612                                 " with a directory\n");
 613                         exit_cleanup(RERR_FILESELECT);
 614                 }
 615         } else if (errno != ENOENT) {
 616                 /* If we don't know what's at the destination, fail. */
 617                 rsyserr(FERROR, errno, "ERROR: cannot stat destination %s",
 618                         full_fname(dest_path));
 619                 exit_cleanup(RERR_FILESELECT);
 620         }
 621
 622         cp = strrchr(dest_path, '/');
 623
 624         /* If we need a destination directory because the transfer is not
 625          * of a single non-directory or the user has requested one via a
 626          * destination path ending in a slash, create one and use mode 1. */
 627         if (file_total > 1 || (cp && !cp[1])) {
 628                 /* Lop off the final slash (if any). */
 629                 if (cp && !cp[1])
 630                         *cp = '\0';
 631
 632                 if (statret == 0) {
 633                         rprintf(FERROR,
 634                             "ERROR: destination path is not a directory\n");
 635                         exit_cleanup(RERR_SYNTAX);
 636                 }
 637
 638                 if (mkdir_defmode(dest_path) != 0) {
 639                         rsyserr(FERROR, errno, "mkdir %s failed",
 640                                 full_fname(dest_path));
 641                         exit_cleanup(RERR_FILEIO);
 642                 }
 643
 644                 if (flist->high >= flist->low
 645                  && strcmp(flist->files[flist->low]->basename, ".") == 0)
 646                         flist->files[0]->flags |= FLAG_DIR_CREATED;
 647
 648                 if (INFO_GTE(NAME, 1))
 649                         rprintf(FINFO, "created directory %s\n", dest_path);
 650
 651                 if (dry_run) {
 652                         /* Indicate that dest dir doesn't really exist. */
 653                         dry_run++;
 654                 }
 655
 656                 if (!change_dir(dest_path, dry_run > 1 ? CD_SKIP_CHDIR : CD_NORMAL)) {
 657                         rsyserr(FERROR, errno, "change_dir#2 %s failed",
 658                                 full_fname(dest_path));
 659                         exit_cleanup(RERR_FILESELECT);
 660                 }
 661
 662                 return NULL;
 663         }
 664
 665         /* Otherwise, we are writing a single file, possibly on top of an
 666          * existing non-directory.  Change to the item's parent directory
 667          * (if it has a path component), return the basename of the
 668          * destination file as the local name, and use mode 2. */
 669         if (!cp)
 670                 return dest_path;
 671
 672         if (cp == dest_path)
 673                 dest_path = "/";
 674
 675         *cp = '\0';
 676         if (!change_dir(dest_path, CD_NORMAL)) {
 677                 rsyserr(FERROR, errno, "change_dir#3 %s failed",
 678                         full_fname(dest_path));
 679                 exit_cleanup(RERR_FILESELECT);
 680         }
 681         *cp = '/';
 682
 683         return cp + 1;
 684 }
 685
 686 /* This function checks on our alternate-basis directories.  If we're in
 687  * dry-run mode and the destination dir does not yet exist, we'll try to
 688  * tweak any dest-relative paths to make them work for a dry-run (the
 689  * destination dir must be in curr_dir[] when this function is called).
 690  * We also warn about any arg that is non-existent or not a directory. */
 691 static void check_alt_basis_dirs(void)
 692 {
 693         STRUCT_STAT st;
 694         char **dir_p, *slash = strrchr(curr_dir, '/');
 695
 696         for (dir_p = basis_dir; *dir_p; dir_p++) {
 697                 if (dry_run > 1 && **dir_p != '/') {
 698                         int len = curr_dir_len + 1 + strlen(*dir_p) + 1;
 699                         char *new = new_array(char, len);
 700                         if (!new)
 701                                 out_of_memory("check_alt_basis_dirs");
 702                         if (slash && strncmp(*dir_p, "../", 3) == 0) {
 703                             /* We want to remove only one leading "../" prefix for
 704                              * the directory we couldn't create in dry-run mode:
 705                              * this ensures that any other ".." references get
 706                              * evaluated the same as they would for a live copy. */
 707                             *slash = '\0';
 708                             pathjoin(new, len, curr_dir, *dir_p + 3);
 709                             *slash = '/';
 710                         } else
 711                             pathjoin(new, len, curr_dir, *dir_p);
 712                         *dir_p = new;
 713                 }
 714                 if (do_stat(*dir_p, &st) < 0) {
 715                         rprintf(FWARNING, "%s arg does not exist: %s\n",
 716                                 dest_option, *dir_p);
 717                 } else if (!S_ISDIR(st.st_mode)) {
 718                         rprintf(FWARNING, "%s arg is not a dir: %s\n",
 719                                 dest_option, *dir_p);
 720                 }
 721         }
 722 }
 723
 724 /* This is only called by the sender. */
 725 static void read_final_goodbye(int f_in, int f_out)
 726 {
 727         int i, iflags, xlen;
 728         uchar fnamecmp_type;
 729         char xname[MAXPATHLEN];
 730
 731         shutting_down = True;
 732
 733         if (protocol_version < 29)
 734                 i = read_int(f_in);
 735         else {
 736                 i = read_ndx_and_attrs(f_in, f_out, &iflags, &fnamecmp_type, xname, &xlen);
 737                 if (protocol_version >= 31 && i == NDX_DONE) {
 738                         if (am_sender)
 739                                 write_ndx(f_out, NDX_DONE);
 740                         else {
 741                                 if (batch_gen_fd >= 0) {
 742                                         while (read_int(batch_gen_fd) != NDX_DEL_STATS) {}
 743                                         read_del_stats(batch_gen_fd);
 744                                 }
 745                                 write_int(f_out, NDX_DONE);
 746                         }
 747                         i = read_ndx_and_attrs(f_in, f_out, &iflags, &fnamecmp_type, xname, &xlen);
 748                 }
 749         }
 750
 751         if (i != NDX_DONE) {
 752                 rprintf(FERROR, "Invalid packet at end of run (%d) [%s]\n",
 753                         i, who_am_i());
 754                 exit_cleanup(RERR_PROTOCOL);
 755         }
 756 }
 757
 758 static void do_server_sender(int f_in, int f_out, int argc, char *argv[])
 759 {
 760         struct file_list *flist;
 761         char *dir = argv[0];
 762
 763         if (DEBUG_GTE(SEND, 1)) {
 764                 rprintf(FINFO, "server_sender starting pid=%ld\n",
 765                         (long)getpid());
 766         }
 767
 768         if (am_daemon && lp_write_only(module_id)) {
 769                 rprintf(FERROR, "ERROR: module is write only\n");
 770                 exit_cleanup(RERR_SYNTAX);
 771                 return;
 772         }
 773         if (am_daemon && read_only && remove_source_files) {
 774                 rprintf(FERROR,
 775                     "ERROR: --remove-%s-files cannot be used with a read-only module\n",
 776                     remove_source_files == 1 ? "source" : "sent");
 777                 exit_cleanup(RERR_SYNTAX);
 778                 return;
 779         }
 780
 781         if (!relative_paths) {
 782                 if (!change_dir(dir, CD_NORMAL)) {
 783                         rsyserr(FERROR, errno, "change_dir#3 %s failed",
 784                                 full_fname(dir));
 785                         exit_cleanup(RERR_FILESELECT);
 786                 }
 787         }
 788         argc--;
 789         argv++;
 790
 791         if (argc == 0 && (recurse || xfer_dirs || list_only)) {
 792                 argc = 1;
 793                 argv--;
 794                 argv[0] = ".";
 795         }
 796
 797         flist = send_file_list(f_out,argc,argv);
 798         if (!flist || flist->used == 0)
 799                 exit_cleanup(0);
 800
 801         io_start_buffering_in(f_in);
 802
 803         send_files(f_in, f_out);
 804         io_flush(FULL_FLUSH);
 805         handle_stats(f_out);
 806         if (protocol_version >= 24)
 807                 read_final_goodbye(f_in, f_out);
 808         io_flush(FULL_FLUSH);
 809         exit_cleanup(0);
 810 }
 811
 812
 813 static int do_recv(int f_in, int f_out, char *local_name)
 814 {
 815         int pid;
 816         int exit_code = 0;
 817         int error_pipe[2];
 818
 819         /* The receiving side mustn't obey this, or an existing symlink that
 820          * points to an identical file won't be replaced by the referent. */
 821         copy_links = copy_dirlinks = copy_unsafe_links = 0;
 822
 823 #ifdef SUPPORT_HARD_LINKS
 824         if (preserve_hard_links && !inc_recurse)
 825                 match_hard_links(first_flist);
 826 #endif
 827
 828         if (fd_pair(error_pipe) < 0) {
 829                 rsyserr(FERROR, errno, "pipe failed in do_recv");
 830                 exit_cleanup(RERR_IPC);
 831         }
 832
 833         if (backup_dir) {
 834                 int ret = make_path(backup_dir_buf, MKP_DROP_NAME); /* drops trailing slash */
 835                 if (ret < 0)
 836                         exit_cleanup(RERR_SYNTAX);
 837                 if (ret)
 838                         rprintf(FINFO, "Created backup_dir %s\n", backup_dir_buf);
 839                 else if (INFO_GTE(BACKUP, 1))
 840                         rprintf(FINFO, "backup_dir is %s\n", backup_dir_buf);
 841         }
 842
 843         io_flush(FULL_FLUSH);
 844
 845         if ((pid = do_fork()) == -1) {
 846                 rsyserr(FERROR, errno, "fork failed in do_recv");
 847                 exit_cleanup(RERR_IPC);
 848         }
 849
 850         if (pid == 0) {
 851                 send_msgs_to_gen = am_server;
 852
 853                 close(error_pipe[0]);
 854
 855                 /* We can't let two processes write to the socket at one time. */
 856                 io_end_multiplex_out(MPLX_SWITCHING);
 857                 if (f_in != f_out)
 858                         close(f_out);
 859                 sock_f_out = -1;
 860                 f_out = error_pipe[1];
 861
 862                 bwlimit_writemax = 0; /* receiver doesn't need to do this */
 863
 864                 if (read_batch)
 865                         io_start_buffering_in(f_in);
 866                 io_start_multiplex_out(f_out);
 867
 868                 recv_files(f_in, f_out, local_name);
 869                 io_flush(FULL_FLUSH);
 870                 handle_stats(f_in);
 871
 872                 if (output_needs_newline) {
 873                         fputc('\n', stdout);
 874                         output_needs_newline = 0;
 875                 }
 876
 877                 write_int(f_out, NDX_DONE);
 878                 send_msg(MSG_STATS, (char*)&stats.total_read, sizeof stats.total_read, 0);
 879                 io_flush(FULL_FLUSH);
 880
 881                 /* Handle any keep-alive packets from the post-processing work
 882                  * that the generator does. */
 883                 if (protocol_version >= 29) {
 884                         kluge_around_eof = -1;
 885
 886                         /* This should only get stopped via a USR2 signal. */
 887                         read_final_goodbye(f_in, f_out);
 888
 889                         rprintf(FERROR, "Invalid packet at end of run [%s]\n",
 890                                 who_am_i());
 891                         exit_cleanup(RERR_PROTOCOL);
 892                 }
 893
 894                 /* Finally, we go to sleep until our parent kills us with a
 895                  * USR2 signal.  We sleep for a short time, as on some OSes
 896                  * a signal won't interrupt a sleep! */
 897                 while (1)
 898                         msleep(20);
 899         }
 900
 901         am_generator = 1;
 902         flist_receiving_enabled = True;
 903
 904         io_end_multiplex_in(MPLX_SWITCHING);
 905         if (write_batch && !am_server)
 906                 stop_write_batch();
 907
 908         close(error_pipe[1]);
 909         if (f_in != f_out)
 910                 close(f_in);
 911         sock_f_in = -1;
 912         f_in = error_pipe[0];
 913
 914         io_start_buffering_out(f_out);
 915         io_start_multiplex_in(f_in);
 916
 917 #ifdef SUPPORT_HARD_LINKS
 918         if (preserve_hard_links && inc_recurse) {
 919                 struct file_list *flist;
 920                 for (flist = first_flist; flist; flist = flist->next)
 921                         match_hard_links(flist);
 922         }
 923 #endif
 924
 925         generate_files(f_out, local_name);
 926
 927         handle_stats(-1);
 928         io_flush(FULL_FLUSH);
 929         shutting_down = True;
 930         if (protocol_version >= 24) {
 931                 /* send a final goodbye message */
 932                 write_ndx(f_out, NDX_DONE);
 933         }
 934         io_flush(FULL_FLUSH);
 935
 936         kill(pid, SIGUSR2);
 937         wait_process_with_flush(pid, &exit_code);
 938         return exit_code;
 939 }
 940
 941 static void do_server_recv(int f_in, int f_out, int argc, char *argv[])
 942 {
 943         int exit_code;
 944         struct file_list *flist;
 945         char *local_name = NULL;
 946         int negated_levels;
 947
 948         if (filesfrom_fd >= 0 && !msgs2stderr && protocol_version < 31) {
 949                 /* We can't mix messages with files-from data on the socket,
 950                  * so temporarily turn off info/debug messages. */
 951                 negate_output_levels();
 952                 negated_levels = 1;
 953         } else
 954                 negated_levels = 0;
 955
 956         if (DEBUG_GTE(RECV, 1)) {
 957                 rprintf(FINFO, "server_recv(%d) starting pid=%ld\n",
 958                         argc, (long)getpid());
 959         }
 960
 961         if (am_daemon && read_only) {
 962                 rprintf(FERROR,"ERROR: module is read only\n");
 963                 exit_cleanup(RERR_SYNTAX);
 964                 return;
 965         }
 966
 967         if (argc > 0) {
 968                 char *dir = argv[0];
 969                 argc--;
 970                 argv++;
 971                 if (!am_daemon && !change_dir(dir, CD_NORMAL)) {
 972                         rsyserr(FERROR, errno, "change_dir#4 %s failed",
 973                                 full_fname(dir));
 974                         exit_cleanup(RERR_FILESELECT);
 975                 }
 976         }
 977
 978         if (protocol_version >= 30)
 979                 io_start_multiplex_in(f_in);
 980         else
 981                 io_start_buffering_in(f_in);
 982         recv_filter_list(f_in);
 983
 984         if (filesfrom_fd >= 0) {
 985                 /* We need to send the files-from names to the sender at the
 986                  * same time that we receive the file-list from them, so we
 987                  * need the IO routines to automatically write out the names
 988                  * onto our f_out socket as we read the file-list.  This
 989                  * avoids both deadlock and extra delays/buffers. */
 990                 start_filesfrom_forwarding(filesfrom_fd);
 991                 filesfrom_fd = -1;
 992         }
 993
 994         flist = recv_file_list(f_in);
 995         if (!flist) {
 996                 rprintf(FERROR,"server_recv: recv_file_list error\n");
 997                 exit_cleanup(RERR_FILESELECT);
 998         }
 999         if (inc_recurse && file_total == 1)
1000                 recv_additional_file_list(f_in);
1001
1002         if (negated_levels)
1003                 negate_output_levels();
1004
1005         if (argc > 0)
1006                 local_name = get_local_name(flist,argv[0]);
1007
1008         /* Now that we know what our destination directory turned out to be,
1009          * we can sanitize the --link-/copy-/compare-dest args correctly. */
1010         if (sanitize_paths) {
1011                 char **dir_p;
1012                 for (dir_p = basis_dir; *dir_p; dir_p++)
1013                         *dir_p = sanitize_path(NULL, *dir_p, NULL, curr_dir_depth, SP_DEFAULT);
1014                 if (partial_dir)
1015                         partial_dir = sanitize_path(NULL, partial_dir, NULL, curr_dir_depth, SP_DEFAULT);
1016         }
1017         check_alt_basis_dirs();
1018
1019         if (daemon_filter_list.head) {
1020                 char **dir_p;
1021                 filter_rule_list *elp = &daemon_filter_list;
1022
1023                 for (dir_p = basis_dir; *dir_p; dir_p++) {
1024                         char *dir = *dir_p;
1025                         if (*dir == '/')
1026                                 dir += module_dirlen;
1027                         if (check_filter(elp, FLOG, dir, 1) < 0)
1028                                 goto options_rejected;
1029                 }
1030                 if (partial_dir && *partial_dir == '/'
1031                  && check_filter(elp, FLOG, partial_dir + module_dirlen, 1) < 0) {
1032                     options_rejected:
1033                         rprintf(FERROR,
1034                                 "Your options have been rejected by the server.\n");
1035                         exit_cleanup(RERR_SYNTAX);
1036                 }
1037         }
1038
1039         exit_code = do_recv(f_in, f_out, local_name);
1040         exit_cleanup(exit_code);
1041 }
1042
1043
1044 int child_main(int argc, char *argv[])
1045 {
1046         start_server(STDIN_FILENO, STDOUT_FILENO, argc, argv);
1047         return 0;
1048 }
1049
1050
1051 void start_server(int f_in, int f_out, int argc, char *argv[])
1052 {
1053         set_nonblocking(f_in);
1054         set_nonblocking(f_out);
1055
1056         io_set_sock_fds(f_in, f_out);
1057         setup_protocol(f_out, f_in);
1058
1059         if (protocol_version >= 23)
1060                 io_start_multiplex_out(f_out);
1061         if (am_daemon && io_timeout && protocol_version >= 31)
1062                 send_msg_int(MSG_IO_TIMEOUT, io_timeout);
1063
1064         if (am_sender) {
1065                 keep_dirlinks = 0; /* Must be disabled on the sender. */
1066                 if (need_messages_from_generator)
1067                         io_start_multiplex_in(f_in);
1068                 else
1069                         io_start_buffering_in(f_in);
1070                 recv_filter_list(f_in);
1071                 do_server_sender(f_in, f_out, argc, argv);
1072         } else
1073                 do_server_recv(f_in, f_out, argc, argv);
1074         exit_cleanup(0);
1075 }
1076
1077 /* This is called once the connection has been negotiated.  It is used
1078  * for rsyncd, remote-shell, and local connections. */
1079 int client_run(int f_in, int f_out, pid_t pid, int argc, char *argv[])
1080 {
1081         struct file_list *flist = NULL;
1082         int exit_code = 0, exit_code2 = 0;
1083         char *local_name = NULL;
1084
1085         cleanup_child_pid = pid;
1086         if (!read_batch) {
1087                 set_nonblocking(f_in);
1088                 set_nonblocking(f_out);
1089         }
1090
1091         io_set_sock_fds(f_in, f_out);
1092         setup_protocol(f_out,f_in);
1093
1094         /* We set our stderr file handle to blocking because ssh might have
1095          * set it to non-blocking.  This can be particularly troublesome if
1096          * stderr is a clone of stdout, because ssh would have set our stdout
1097          * to non-blocking at the same time (which can easily cause us to lose
1098          * output from our print statements).  This kluge shouldn't cause ssh
1099          * any problems for how we use it.  Note also that we delayed setting
1100          * this until after the above protocol setup so that we know for sure
1101          * that ssh is done twiddling its file descriptors.  */
1102         set_blocking(STDERR_FILENO);
1103
1104         if (am_sender) {
1105                 keep_dirlinks = 0; /* Must be disabled on the sender. */
1106
1107                 if (always_checksum
1108                  && (log_format_has(stdout_format, 'C')
1109                   || log_format_has(logfile_format, 'C')))
1110                         sender_keeps_checksum = 1;
1111
1112                 if (protocol_version >= 30)
1113                         io_start_multiplex_out(f_out);
1114                 else
1115                         io_start_buffering_out(f_out);
1116                 if (protocol_version >= 31 || (!filesfrom_host && protocol_version >= 23))
1117                         io_start_multiplex_in(f_in);
1118                 else
1119                         io_start_buffering_in(f_in);
1120                 send_filter_list(f_out);
1121                 if (filesfrom_host)
1122                         filesfrom_fd = f_in;
1123
1124                 if (write_batch && !am_server)
1125                         start_write_batch(f_out);
1126                 flist = send_file_list(f_out, argc, argv);
1127                 if (DEBUG_GTE(FLIST, 3))
1128                         rprintf(FINFO,"file list sent\n");
1129
1130                 if (protocol_version < 31 && filesfrom_host && protocol_version >= 23)
1131                         io_start_multiplex_in(f_in);
1132
1133                 io_flush(NORMAL_FLUSH);
1134                 send_files(f_in, f_out);
1135                 io_flush(FULL_FLUSH);
1136                 handle_stats(-1);
1137                 if (protocol_version >= 24)
1138                         read_final_goodbye(f_in, f_out);
1139                 if (pid != -1) {
1140                         if (DEBUG_GTE(EXIT, 2))
1141                                 rprintf(FINFO,"client_run waiting on %d\n", (int) pid);
1142                         io_flush(FULL_FLUSH);
1143                         wait_process_with_flush(pid, &exit_code);
1144                 }
1145                 output_summary();
1146                 io_flush(FULL_FLUSH);
1147                 exit_cleanup(exit_code);
1148         }
1149
1150         if (!read_batch) {
1151                 if (protocol_version >= 23)
1152                         io_start_multiplex_in(f_in);
1153                 if (need_messages_from_generator)
1154                         io_start_multiplex_out(f_out);
1155                 else
1156                         io_start_buffering_out(f_out);
1157         }
1158
1159         send_filter_list(read_batch ? -1 : f_out);
1160
1161         if (filesfrom_fd >= 0) {
1162                 start_filesfrom_forwarding(filesfrom_fd);
1163                 filesfrom_fd = -1;
1164         }
1165
1166         if (write_batch && !am_server)
1167                 start_write_batch(f_in);
1168         flist = recv_file_list(f_in);
1169         if (inc_recurse && file_total == 1)
1170                 recv_additional_file_list(f_in);
1171
1172         if (flist && flist->used > 0) {
1173                 local_name = get_local_name(flist, argv[0]);
1174
1175                 check_alt_basis_dirs();
1176
1177                 exit_code2 = do_recv(f_in, f_out, local_name);
1178         } else {
1179                 handle_stats(-1);
1180                 output_summary();
1181         }
1182
1183         if (pid != -1) {
1184                 if (DEBUG_GTE(RECV, 1))
1185                         rprintf(FINFO,"client_run2 waiting on %d\n", (int) pid);
1186                 io_flush(FULL_FLUSH);
1187                 wait_process_with_flush(pid, &exit_code);
1188         }
1189
1190         return MAX(exit_code, exit_code2);
1191 }
1192
1193 static int copy_argv(char *argv[])
1194 {
1195         int i;
1196
1197         for (i = 0; argv[i]; i++) {
1198                 if (!(argv[i] = strdup(argv[i]))) {
1199                         rprintf (FERROR, "out of memory at %s(%d)\n",
1200                                  __FILE__, __LINE__);
1201                         return RERR_MALLOC;
1202                 }
1203         }
1204
1205         return 0;
1206 }
1207
1208
1209 /* Start a client for either type of remote connection.  Work out
1210  * whether the arguments request a remote shell or rsyncd connection,
1211  * and call the appropriate connection function, then run_client.
1212  *
1213  * Calls either start_socket_client (for sockets) or do_cmd and
1214  * client_run (for ssh). */
1215 static int start_client(int argc, char *argv[])
1216 {
1217         char *p, *shell_machine = NULL, *shell_user = NULL;
1218         char **remote_argv;
1219         int remote_argc;
1220         int f_in, f_out;
1221         int ret;
1222         pid_t pid;
1223
1224         /* Don't clobber argv[] so that ps(1) can still show the right
1225          * command line. */
1226         if ((ret = copy_argv(argv)) != 0)
1227                 return ret;
1228
1229         if (!read_batch) { /* for read_batch, NO source is specified */
1230                 char *path = check_for_hostspec(argv[0], &shell_machine, &rsync_port);
1231                 if (path) { /* source is remote */
1232                         char *dummy_host;
1233                         int dummy_port = 0;
1234                         *argv = path;
1235                         remote_argv = argv;
1236                         remote_argc = argc;
1237                         argv += argc - 1;
1238                         if (argc == 1 || **argv == ':')
1239                                 argc = 0; /* no dest arg */
1240                         else if (check_for_hostspec(*argv, &dummy_host, &dummy_port)) {
1241                                 rprintf(FERROR,
1242                                         "The source and destination cannot both be remote.\n");
1243                                 exit_cleanup(RERR_SYNTAX);
1244                         } else {
1245                                 remote_argc--; /* don't count dest */
1246                                 argc = 1;
1247                         }
1248                         if (filesfrom_host && *filesfrom_host
1249                             && strcmp(filesfrom_host, shell_machine) != 0) {
1250                                 rprintf(FERROR,
1251                                         "--files-from hostname is not the same as the transfer hostname\n");
1252                                 exit_cleanup(RERR_SYNTAX);
1253                         }
1254                         am_sender = 0;
1255                         if (rsync_port)
1256                                 daemon_over_rsh = shell_cmd ? 1 : -1;
1257                 } else { /* source is local, check dest arg */
1258                         am_sender = 1;
1259
1260                         if (argc > 1) {
1261                                 p = argv[--argc];
1262                                 remote_argv = argv + argc;
1263                         } else {
1264                                 static char *dotarg[1] = { "." };
1265                                 p = dotarg[0];
1266                                 remote_argv = dotarg;
1267                         }
1268                         remote_argc = 1;
1269
1270                         path = check_for_hostspec(p, &shell_machine, &rsync_port);
1271                         if (path && filesfrom_host && *filesfrom_host
1272                             && strcmp(filesfrom_host, shell_machine) != 0) {
1273                                 rprintf(FERROR,
1274                                         "--files-from hostname is not the same as the transfer hostname\n");
1275                                 exit_cleanup(RERR_SYNTAX);
1276                         }
1277                         if (!path) { /* no hostspec found, so src & dest are local */
1278                                 local_server = 1;
1279                                 if (filesfrom_host) {
1280                                         rprintf(FERROR,
1281                                                 "--files-from cannot be remote when the transfer is local\n");
1282                                         exit_cleanup(RERR_SYNTAX);
1283                                 }
1284                                 shell_machine = NULL;
1285                         } else { /* hostspec was found, so dest is remote */
1286                                 argv[argc] = path;
1287                                 if (rsync_port)
1288                                         daemon_over_rsh = shell_cmd ? 1 : -1;
1289                         }
1290                 }
1291         } else {  /* read_batch */
1292                 local_server = 1;
1293                 if (check_for_hostspec(argv[argc-1], &shell_machine, &rsync_port)) {
1294                         rprintf(FERROR, "remote destination is not allowed with --read-batch\n");
1295                         exit_cleanup(RERR_SYNTAX);
1296                 }
1297                 remote_argv = argv += argc - 1;
1298                 remote_argc = argc = 1;
1299         }
1300
1301         if (am_sender) {
1302                 char *dummy_host;
1303                 int dummy_port = rsync_port;
1304                 int i;
1305                 /* For local source, extra source args must not have hostspec. */
1306                 for (i = 1; i < argc; i++) {
1307                         if (check_for_hostspec(argv[i], &dummy_host, &dummy_port)) {
1308                                 rprintf(FERROR, "Unexpected remote arg: %s\n", argv[i]);
1309                                 exit_cleanup(RERR_SYNTAX);
1310                         }
1311                 }
1312         } else {
1313                 char *dummy_host;
1314                 int dummy_port = rsync_port;
1315                 int i;
1316                 /* For remote source, any extra source args must have either
1317                  * the same hostname or an empty hostname. */
1318                 for (i = 1; i < remote_argc; i++) {
1319                         char *arg = check_for_hostspec(remote_argv[i], &dummy_host, &dummy_port);
1320                         if (!arg) {
1321                                 rprintf(FERROR, "Unexpected local arg: %s\n", remote_argv[i]);
1322                                 rprintf(FERROR, "If arg is a remote file/dir, prefix it with a colon (:).\n");
1323                                 exit_cleanup(RERR_SYNTAX);
1324                         }
1325                         if (*dummy_host && strcmp(dummy_host, shell_machine) != 0) {
1326                                 rprintf(FERROR, "All source args must come from the same machine.\n");
1327                                 exit_cleanup(RERR_SYNTAX);
1328                         }
1329                         if (rsync_port != dummy_port) {
1330                                 if (!rsync_port || !dummy_port)
1331                                         rprintf(FERROR, "All source args must use the same hostspec format.\n");
1332                                 else
1333                                         rprintf(FERROR, "All source args must use the same port number.\n");
1334                                 exit_cleanup(RERR_SYNTAX);
1335                         }
1336                         remote_argv[i] = arg;
1337                 }
1338         }
1339
1340         if (daemon_over_rsh < 0)
1341                 return start_socket_client(shell_machine, remote_argc, remote_argv, argc, argv);
1342
1343         if (password_file && !daemon_over_rsh) {
1344                 rprintf(FERROR, "The --password-file option may only be "
1345                                 "used when accessing an rsync daemon.\n");
1346                 exit_cleanup(RERR_SYNTAX);
1347         }
1348
1349         if (connect_timeout) {
1350                 rprintf(FERROR, "The --contimeout option may only be "
1351                                 "used when connecting to an rsync daemon.\n");
1352                 exit_cleanup(RERR_SYNTAX);
1353         }
1354
1355         if (shell_machine) {
1356                 p = strrchr(shell_machine,'@');
1357                 if (p) {
1358                         *p = 0;
1359                         shell_user = shell_machine;
1360                         shell_machine = p+1;
1361                 }
1362         }
1363
1364         if (DEBUG_GTE(CMD, 2)) {
1365                 rprintf(FINFO,"cmd=%s machine=%s user=%s path=%s\n",
1366                         NS(shell_cmd), NS(shell_machine), NS(shell_user),
1367                         NS(remote_argv[0]));
1368         }
1369
1370         pid = do_cmd(shell_cmd, shell_machine, shell_user, remote_argv, remote_argc,
1371                      &f_in, &f_out);
1372
1373         /* if we're running an rsync server on the remote host over a
1374          * remote shell command, we need to do the RSYNCD protocol first */
1375         if (daemon_over_rsh) {
1376                 int tmpret;
1377                 tmpret = start_inband_exchange(f_in, f_out, shell_user, remote_argc, remote_argv);
1378                 if (tmpret < 0)
1379                         return tmpret;
1380         }
1381
1382         ret = client_run(f_in, f_out, pid, argc, argv);
1383
1384         fflush(stdout);
1385         fflush(stderr);
1386
1387         return ret;
1388 }
1389
1390
1391 static RETSIGTYPE sigusr1_handler(UNUSED(int val))
1392 {
1393         exit_cleanup(RERR_SIGNAL1);
1394 }
1395
1396 static RETSIGTYPE sigusr2_handler(UNUSED(int val))
1397 {
1398         if (!am_server)
1399                 output_summary();
1400         close_all();
1401         if (got_xfer_error)
1402                 _exit(RERR_PARTIAL);
1403         _exit(0);
1404 }
1405
1406 RETSIGTYPE remember_children(UNUSED(int val))
1407 {
1408 #ifdef WNOHANG
1409         int cnt, status;
1410         pid_t pid;
1411         /* An empty waitpid() loop was put here by Tridge and we could never
1412          * get him to explain why he put it in, so rather than taking it
1413          * out we're instead saving the child exit statuses for later use.
1414          * The waitpid() loop presumably eliminates all possibility of leaving
1415          * zombie children, maybe that's why he did it. */
1416         while ((pid = waitpid(-1, &status, WNOHANG)) > 0) {
1417                 /* save the child's exit status */
1418                 for (cnt = 0; cnt < MAXCHILDPROCS; cnt++) {
1419                         if (pid_stat_table[cnt].pid == 0) {
1420                                 pid_stat_table[cnt].pid = pid;
1421                                 pid_stat_table[cnt].status = status;
1422                                 break;
1423                         }
1424                 }
1425         }
1426 #endif
1427 #ifndef HAVE_SIGACTION
1428         signal(SIGCHLD, remember_children);
1429 #endif
1430 }
1431
1432
1433 /**
1434  * This routine catches signals and tries to send them to gdb.
1435  *
1436  * Because it's called from inside a signal handler it ought not to
1437  * use too many library routines.
1438  *
1439  * @todo Perhaps use "screen -X" instead/as well, to help people
1440  * debugging without easy access to X.  Perhaps use an environment
1441  * variable, or just call a script?
1442  *
1443  * @todo The /proc/ magic probably only works on Linux (and
1444  * Solaris?)  Can we be more portable?
1445  **/
1446 #ifdef MAINTAINER_MODE
1447 const char *get_panic_action(void)
1448 {
1449         const char *cmd_fmt = getenv("RSYNC_PANIC_ACTION");
1450
1451         if (cmd_fmt)
1452                 return cmd_fmt;
1453         else
1454                 return "xterm -display :0 -T Panic -n Panic "
1455                         "-e gdb /proc/%d/exe %d";
1456 }
1457
1458
1459 /**
1460  * Handle a fatal signal by launching a debugger, controlled by $RSYNC_PANIC_ACTION.
1461  *
1462  * This signal handler is only installed if we were configured with
1463  * --enable-maintainer-mode.  Perhaps it should always be on and we
1464  * should just look at the environment variable, but I'm a bit leery
1465  * of a signal sending us into a busy loop.
1466  **/
1467 static RETSIGTYPE rsync_panic_handler(UNUSED(int whatsig))
1468 {
1469         char cmd_buf[300];
1470         int ret;
1471
1472         snprintf(cmd_buf, sizeof cmd_buf, get_panic_action(),
1473                  getpid(), getpid());
1474
1475         /* Unless we failed to execute gdb, we allow the process to
1476          * continue.  I'm not sure if that's right. */
1477         ret = system(cmd_buf);
1478         if (ret)
1479                 _exit(ret);
1480 }
1481 #endif
1482
1483
1484 int main(int argc,char *argv[])
1485 {
1486         int ret;
1487         int orig_argc = argc;
1488         char **orig_argv = argv;
1489 #ifdef HAVE_SIGACTION
1490 # ifdef HAVE_SIGPROCMASK
1491         sigset_t sigmask;
1492
1493         sigemptyset(&sigmask);
1494 # endif
1495         sigact.sa_flags = SA_NOCLDSTOP;
1496 #endif
1497         SIGACTMASK(SIGUSR1, sigusr1_handler);
1498         SIGACTMASK(SIGUSR2, sigusr2_handler);
1499         SIGACTMASK(SIGCHLD, remember_children);
1500 #ifdef MAINTAINER_MODE
1501         SIGACTMASK(SIGSEGV, rsync_panic_handler);
1502         SIGACTMASK(SIGFPE, rsync_panic_handler);
1503         SIGACTMASK(SIGABRT, rsync_panic_handler);
1504         SIGACTMASK(SIGBUS, rsync_panic_handler);
1505 #endif
1506
1507         starttime = time(NULL);
1508         our_uid = MY_UID();
1509         our_gid = MY_GID();
1510         am_root = our_uid == 0;
1511
1512         memset(&stats, 0, sizeof(stats));
1513
1514         if (argc < 2) {
1515                 usage(FERROR);
1516                 exit_cleanup(RERR_SYNTAX);
1517         }
1518
1519         /* we set a 0 umask so that correct file permissions can be
1520          * carried across */
1521         orig_umask = umask(0);
1522
1523 #if defined CONFIG_LOCALE && defined HAVE_SETLOCALE
1524         setlocale(LC_CTYPE, "");
1525 #endif
1526
1527         if (!parse_arguments(&argc, (const char ***) &argv)) {
1528                 /* FIXME: We ought to call the same error-handling
1529                  * code here, rather than relying on getopt. */
1530                 option_error();
1531                 exit_cleanup(RERR_SYNTAX);
1532         }
1533
1534         SIGACTMASK(SIGINT, sig_int);
1535         SIGACTMASK(SIGHUP, sig_int);
1536         SIGACTMASK(SIGTERM, sig_int);
1537 #if defined HAVE_SIGACTION && HAVE_SIGPROCMASK
1538         sigprocmask(SIG_UNBLOCK, &sigmask, NULL);
1539 #endif
1540
1541         /* Ignore SIGPIPE; we consistently check error codes and will
1542          * see the EPIPE. */
1543         SIGACTION(SIGPIPE, SIG_IGN);
1544 #ifdef SIGXFSZ
1545         SIGACTION(SIGXFSZ, SIG_IGN);
1546 #endif
1547
1548         /* Initialize change_dir() here because on some old systems getcwd
1549          * (implemented by forking "pwd" and reading its output) doesn't
1550          * work when there are other child processes.  Also, on all systems
1551          * that implement getcwd that way "pwd" can't be found after chroot. */
1552         change_dir(NULL, CD_NORMAL);
1553
1554         init_flist();
1555
1556         if ((write_batch || read_batch) && !am_server) {
1557                 if (write_batch)
1558                         write_batch_shell_file(orig_argc, orig_argv, argc);
1559
1560                 if (read_batch && strcmp(batch_name, "-") == 0)
1561                         batch_fd = STDIN_FILENO;
1562                 else {
1563                         batch_fd = do_open(batch_name,
1564                                    write_batch ? O_WRONLY | O_CREAT | O_TRUNC
1565                                    : O_RDONLY, S_IRUSR | S_IWUSR);
1566                 }
1567                 if (batch_fd < 0) {
1568                         rsyserr(FERROR, errno, "Batch file %s open error",
1569                                 full_fname(batch_name));
1570                         exit_cleanup(RERR_FILEIO);
1571                 }
1572                 if (read_batch)
1573                         read_stream_flags(batch_fd);
1574                 else
1575                         write_stream_flags(batch_fd);
1576         }
1577         if (write_batch < 0)
1578                 dry_run = 1;
1579
1580         if (am_server) {
1581 #ifdef ICONV_CONST
1582                 setup_iconv();
1583 #endif
1584         } else if (am_daemon)
1585                 return daemon_main();
1586
1587         if (am_server && protect_args) {
1588                 char buf[MAXPATHLEN];
1589                 protect_args = 2;
1590                 read_args(STDIN_FILENO, NULL, buf, sizeof buf, 1, &argv, &argc, NULL);
1591                 if (!parse_arguments(&argc, (const char ***) &argv)) {
1592                         option_error();
1593                         exit_cleanup(RERR_SYNTAX);
1594                 }
1595         }
1596
1597         if (argc < 1) {
1598                 usage(FERROR);
1599                 exit_cleanup(RERR_SYNTAX);
1600         }
1601
1602         if (am_server) {
1603                 set_nonblocking(STDIN_FILENO);
1604                 set_nonblocking(STDOUT_FILENO);
1605                 if (am_daemon)
1606                         return start_daemon(STDIN_FILENO, STDOUT_FILENO);
1607                 start_server(STDIN_FILENO, STDOUT_FILENO, argc, argv);
1608         }
1609
1610         ret = start_client(argc, argv);
1611         if (ret == -1)
1612                 exit_cleanup(RERR_STARTCLIENT);
1613         else
1614                 exit_cleanup(ret);
1615
1616         return ret;
1617 }