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