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) 2003-2015 Wayne Davison
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 3 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License along
  20  * with this program; if not, visit the http://fsf.org website.
  21  */
  22
  23 #include "rsync.h"
  24 #include "inums.h"
  25 #include "io.h"
  26 #if defined CONFIG_LOCALE && defined HAVE_LOCALE_H
  27 #include <locale.h>
  28 #endif
  29
  30 extern int dry_run;
  31 extern int list_only;
  32 extern int io_timeout;
  33 extern int am_root;
  34 extern int am_server;
  35 extern int am_sender;
  36 extern int am_daemon;
  37 extern int inc_recurse;
  38 extern int blocking_io;
  39 extern int always_checksum;
  40 extern int remove_source_files;
  41 extern int output_needs_newline;
  42 extern int need_messages_from_generator;
  43 extern int kluge_around_eof;
  44 extern int got_xfer_error;
  45 extern int msgs2stderr;
  46 extern int module_id;
  47 extern int read_only;
  48 extern int copy_links;
  49 extern int copy_dirlinks;
  50 extern int copy_unsafe_links;
  51 extern int keep_dirlinks;
  52 extern int preserve_hard_links;
  53 extern int protocol_version;
  54 extern int file_total;
  55 extern int recurse;
  56 extern int xfer_dirs;
  57 extern int protect_args;
  58 extern int relative_paths;
  59 extern int sanitize_paths;
  60 extern int curr_dir_depth;
  61 extern int curr_dir_len;
  62 extern int module_id;
  63 extern int rsync_port;
  64 extern int whole_file;
  65 extern int read_batch;
  66 extern int write_batch;
  67 extern int batch_fd;
  68 extern int sock_f_in;
  69 extern int sock_f_out;
  70 extern int filesfrom_fd;
  71 extern int connect_timeout;
  72 extern int send_msgs_to_gen;
  73 extern dev_t filesystem_dev;
  74 extern pid_t cleanup_child_pid;
  75 extern size_t bwlimit_writemax;
  76 extern unsigned int module_dirlen;
  77 extern BOOL flist_receiving_enabled;
  78 extern BOOL shutting_down;
  79 extern int backup_dir_len;
  80 extern int basis_dir_cnt;
  81 extern struct stats stats;
  82 extern char *stdout_format;
  83 extern char *logfile_format;
  84 extern char *filesfrom_host;
  85 extern char *partial_dir;
  86 extern char *dest_option;
  87 extern char *rsync_path;
  88 extern char *shell_cmd;
  89 extern char *batch_name;
  90 extern char *password_file;
  91 extern char *backup_dir;
  92 extern char curr_dir[MAXPATHLEN];
  93 extern char backup_dir_buf[MAXPATHLEN];
  94 extern char *basis_dir[MAX_BASIS_DIRS+1];
  95 extern struct file_list *first_flist;
  96 extern filter_rule_list daemon_filter_list;
  97
  98 uid_t our_uid;
  99 gid_t our_gid;
 100 int am_receiver = 0;  /* Only set to 1 after the receiver/generator fork. */
 101 int am_generator = 0; /* Only set to 1 after the receiver/generator fork. */
 102 int local_server = 0;
 103 int daemon_over_rsh = 0;
 104 mode_t orig_umask = 0;
 105 int batch_gen_fd = -1;
 106 int sender_keeps_checksum = 0;
 107
 108 /* There's probably never more than at most 2 outstanding child processes,
 109  * but set it higher, just in case. */
 110 #define MAXCHILDPROCS 7
 111
 112 #ifdef HAVE_SIGACTION
 113 # ifdef HAVE_SIGPROCMASK
 114 #  define SIGACTMASK(n,h) SIGACTION(n,h), sigaddset(&sigmask,(n))
 115 # else
 116 #  define SIGACTMASK(n,h) SIGACTION(n,h)
 117 # endif
 118 static struct sigaction sigact;
 119 #endif
 120
 121 struct pid_status {
 122         pid_t pid;
 123         int status;
 124 } pid_stat_table[MAXCHILDPROCS];
 125
 126 static time_t starttime, endtime;
 127 static int64 total_read, total_written;
 128
 129 static void show_malloc_stats(void);
 130
 131 /* Works like waitpid(), but if we already harvested the child pid in our
 132  * remember_children(), we succeed instead of returning an error. */
 133 pid_t wait_process(pid_t pid, int *status_ptr, int flags)
 134 {
 135         pid_t waited_pid;
 136
 137         do {
 138                 waited_pid = waitpid(pid, status_ptr, flags);
 139         } while (waited_pid == -1 && errno == EINTR);
 140
 141         if (waited_pid == -1 && errno == ECHILD) {
 142                 /* Status of requested child no longer available:  check to
 143                  * see if it was processed by remember_children(). */
 144                 int cnt;
 145                 for (cnt = 0; cnt < MAXCHILDPROCS; cnt++) {
 146                         if (pid == pid_stat_table[cnt].pid) {
 147                                 *status_ptr = pid_stat_table[cnt].status;
 148                                 pid_stat_table[cnt].pid = 0;
 149                                 return pid;
 150                         }
 151                 }
 152         }
 153
 154         return waited_pid;
 155 }
 156
 157 /* Wait for a process to exit, calling io_flush while waiting. */
 158 static void wait_process_with_flush(pid_t pid, int *exit_code_ptr)
 159 {
 160         pid_t waited_pid;
 161         int status;
 162
 163         while ((waited_pid = wait_process(pid, &status, WNOHANG)) == 0) {
 164                 msleep(20);
 165                 io_flush(FULL_FLUSH);
 166         }
 167
 168         /* TODO: If the child exited on a signal, then log an
 169          * appropriate error message.  Perhaps we should also accept a
 170          * message describing the purpose of the child.  Also indicate
 171          * this to the caller so that they know something went wrong. */
 172         if (waited_pid < 0) {
 173                 rsyserr(FERROR, errno, "waitpid");
 174                 *exit_code_ptr = RERR_WAITCHILD;
 175         } else if (!WIFEXITED(status)) {
 176 #ifdef WCOREDUMP
 177                 if (WCOREDUMP(status))
 178                         *exit_code_ptr = RERR_CRASHED;
 179                 else
 180 #endif
 181                 if (WIFSIGNALED(status))
 182                         *exit_code_ptr = RERR_TERMINATED;
 183                 else
 184                         *exit_code_ptr = RERR_WAITCHILD;
 185         } else
 186                 *exit_code_ptr = WEXITSTATUS(status);
 187 }
 188
 189 void write_del_stats(int f)
 190 {
 191         if (read_batch)
 192                 write_int(f, NDX_DEL_STATS);
 193         else
 194                 write_ndx(f, NDX_DEL_STATS);
 195         write_varint(f, stats.deleted_files - stats.deleted_dirs
 196                       - stats.deleted_symlinks - stats.deleted_devices
 197                       - stats.deleted_specials);
 198         write_varint(f, stats.deleted_dirs);
 199         write_varint(f, stats.deleted_symlinks);
 200         write_varint(f, stats.deleted_devices);
 201         write_varint(f, stats.deleted_specials);
 202 }
 203
 204 void read_del_stats(int f)
 205 {
 206         stats.deleted_files = read_varint(f);
 207         stats.deleted_files += stats.deleted_dirs = read_varint(f);
 208         stats.deleted_files += stats.deleted_symlinks = read_varint(f);
 209         stats.deleted_files += stats.deleted_devices = read_varint(f);
 210         stats.deleted_files += stats.deleted_specials = read_varint(f);
 211 }
 212
 213 /* This function gets called from all 3 processes.  We want the client side
 214  * to actually output the text, but the sender is the only process that has
 215  * all the stats we need.  So, if we're a client sender, we do the report.
 216  * If we're a server sender, we write the stats on the supplied fd.  If
 217  * we're the client receiver we read the stats from the supplied fd and do
 218  * the report.  All processes might also generate a set of debug stats, if
 219  * the verbose level is high enough (this is the only thing that the
 220  * generator process and the server receiver ever do here). */
 221 static void handle_stats(int f)
 222 {
 223         endtime = time(NULL);
 224
 225         /* Cache two stats because the read/write code can change it. */
 226         total_read = stats.total_read;
 227         total_written = stats.total_written;
 228
 229         if (INFO_GTE(STATS, 3)) {
 230                 /* These come out from every process */
 231                 show_malloc_stats();
 232                 show_flist_stats();
 233         }
 234
 235         if (am_generator)
 236                 return;
 237
 238         if (am_daemon) {
 239                 if (f == -1 || !am_sender)
 240                         return;
 241         }
 242
 243         if (am_server) {
 244                 if (am_sender) {
 245                         write_varlong30(f, total_read, 3);
 246                         write_varlong30(f, total_written, 3);
 247                         write_varlong30(f, stats.total_size, 3);
 248                         if (protocol_version >= 29) {
 249                                 write_varlong30(f, stats.flist_buildtime, 3);
 250                                 write_varlong30(f, stats.flist_xfertime, 3);
 251                         }
 252                 }
 253                 return;
 254         }
 255
 256         /* this is the client */
 257
 258         if (f < 0 && !am_sender) /* e.g. when we got an empty file list. */
 259                 ;
 260         else if (!am_sender) {
 261                 /* Read the first two in opposite order because the meaning of
 262                  * read/write swaps when switching from sender to receiver. */
 263                 total_written = read_varlong30(f, 3);
 264                 total_read = read_varlong30(f, 3);
 265                 stats.total_size = read_varlong30(f, 3);
 266                 if (protocol_version >= 29) {
 267                         stats.flist_buildtime = read_varlong30(f, 3);
 268                         stats.flist_xfertime = read_varlong30(f, 3);
 269                 }
 270         } else if (write_batch) {
 271                 /* The --read-batch process is going to be a client
 272                  * receiver, so we need to give it the stats. */
 273                 write_varlong30(batch_fd, total_read, 3);
 274                 write_varlong30(batch_fd, total_written, 3);
 275                 write_varlong30(batch_fd, stats.total_size, 3);
 276                 if (protocol_version >= 29) {
 277                         write_varlong30(batch_fd, stats.flist_buildtime, 3);
 278                         write_varlong30(batch_fd, stats.flist_xfertime, 3);
 279                 }
 280         }
 281 }
 282
 283 static void output_itemized_counts(const char *prefix, int *counts)
 284 {
 285         static char *labels[] = { "reg", "dir", "link", "dev", "special" };
 286         char buf[1024], *pre = " (";
 287         int j, len = 0;
 288         int total = counts[0];
 289         if (total) {
 290                 counts[0] -= counts[1] + counts[2] + counts[3] + counts[4];
 291                 for (j = 0; j < 5; j++) {
 292                         if (counts[j]) {
 293                                 len += snprintf(buf+len, sizeof buf - len - 2,
 294                                         "%s%s: %s",
 295                                         pre, labels[j], comma_num(counts[j]));
 296                                 pre = ", ";
 297                         }
 298                 }
 299                 buf[len++] = ')';
 300         }
 301         buf[len] = '\0';
 302         rprintf(FINFO, "%s: %s%s\n", prefix, comma_num(total), buf);
 303 }
 304
 305 static const char *bytes_per_sec_human_dnum(void)
 306 {
 307         if (starttime == (time_t)-1 || endtime == (time_t)-1)
 308                 return "UNKNOWN";
 309         return human_dnum((total_written + total_read) / (0.5 + (endtime - starttime)), 2);
 310 }
 311
 312 static void output_summary(void)
 313 {
 314         if (INFO_GTE(STATS, 2)) {
 315                 rprintf(FCLIENT, "\n");
 316                 output_itemized_counts("Number of files", &stats.num_files);
 317                 if (protocol_version >= 29)
 318                         output_itemized_counts("Number of created files", &stats.created_files);
 319                 if (protocol_version >= 31)
 320                         output_itemized_counts("Number of deleted files", &stats.deleted_files);
 321                 rprintf(FINFO,"Number of regular files transferred: %s\n",
 322                         comma_num(stats.xferred_files));
 323                 rprintf(FINFO,"Total file size: %s bytes\n",
 324                         human_num(stats.total_size));
 325                 rprintf(FINFO,"Total transferred file size: %s bytes\n",
 326                         human_num(stats.total_transferred_size));
 327                 rprintf(FINFO,"Literal data: %s bytes\n",
 328                         human_num(stats.literal_data));
 329                 rprintf(FINFO,"Matched data: %s bytes\n",
 330                         human_num(stats.matched_data));
 331                 rprintf(FINFO,"File list size: %s\n",
 332                         human_num(stats.flist_size));
 333                 if (stats.flist_buildtime) {
 334                         rprintf(FINFO,
 335                                 "File list generation time: %s seconds\n",
 336                                 comma_dnum((double)stats.flist_buildtime / 1000, 3));
 337                         rprintf(FINFO,
 338                                 "File list transfer time: %s seconds\n",
 339                                 comma_dnum((double)stats.flist_xfertime / 1000, 3));
 340                 }
 341                 rprintf(FINFO,"Total bytes sent: %s\n",
 342                         human_num(total_written));
 343                 rprintf(FINFO,"Total bytes received: %s\n",
 344                         human_num(total_read));
 345         }
 346
 347         if (INFO_GTE(STATS, 1)) {
 348                 rprintf(FCLIENT, "\n");
 349                 rprintf(FINFO,
 350                         "sent %s bytes  received %s bytes  %s bytes/sec\n",
 351                         human_num(total_written), human_num(total_read),
 352                         bytes_per_sec_human_dnum());
 353                 rprintf(FINFO, "total size is %s  speedup is %s%s\n",
 354                         human_num(stats.total_size),
 355                         comma_dnum((double)stats.total_size / (total_written+total_read), 2),
 356                         write_batch < 0 ? " (BATCH ONLY)" : dry_run ? " (DRY RUN)" : "");
 357         }
 358
 359         fflush(stdout);
 360         fflush(stderr);
 361 }
 362
 363
 364 /**
 365  * If our C library can get malloc statistics, then show them to FINFO
 366  **/
 367 static void show_malloc_stats(void)
 368 {
 369 #ifdef HAVE_MALLINFO
 370         struct mallinfo mi;
 371
 372         mi = mallinfo();
 373
 374         rprintf(FCLIENT, "\n");
 375         rprintf(FINFO, RSYNC_NAME "[%d] (%s%s%s) heap statistics:\n",
 376                 (int)getpid(), am_server ? "server " : "",
 377                 am_daemon ? "daemon " : "", who_am_i());
 378         rprintf(FINFO, "  arena:     %10ld   (bytes from sbrk)\n",
 379                 (long)mi.arena);
 380         rprintf(FINFO, "  ordblks:   %10ld   (chunks not in use)\n",
 381                 (long)mi.ordblks);
 382         rprintf(FINFO, "  smblks:    %10ld\n",
 383                 (long)mi.smblks);
 384         rprintf(FINFO, "  hblks:     %10ld   (chunks from mmap)\n",
 385                 (long)mi.hblks);
 386         rprintf(FINFO, "  hblkhd:    %10ld   (bytes from mmap)\n",
 387                 (long)mi.hblkhd);
 388         rprintf(FINFO, "  allmem:    %10ld   (bytes from sbrk + mmap)\n",
 389                 (long)mi.arena + mi.hblkhd);
 390         rprintf(FINFO, "  usmblks:   %10ld\n",
 391                 (long)mi.usmblks);
 392         rprintf(FINFO, "  fsmblks:   %10ld\n",
 393                 (long)mi.fsmblks);
 394         rprintf(FINFO, "  uordblks:  %10ld   (bytes used)\n",
 395                 (long)mi.uordblks);
 396         rprintf(FINFO, "  fordblks:  %10ld   (bytes free)\n",
 397                 (long)mi.fordblks);
 398         rprintf(FINFO, "  keepcost:  %10ld   (bytes in releasable chunk)\n",
 399                 (long)mi.keepcost);
 400 #endif /* HAVE_MALLINFO */
 401 }
 402
 403
 404 /* Start the remote shell.   cmd may be NULL to use the default. */
 405 static pid_t do_cmd(char *cmd, char *machine, char *user, char **remote_argv, int remote_argc,
 406                     int *f_in_p, int *f_out_p)
 407 {
 408         int i, argc = 0;
 409         char *args[MAX_ARGS], *need_to_free = NULL;
 410         pid_t pid;
 411         int dash_l_set = 0;
 412
 413         if (!read_batch && !local_server) {
 414                 char *t, *f, in_quote = '\0';
 415                 char *rsh_env = getenv(RSYNC_RSH_ENV);
 416                 if (!cmd)
 417                         cmd = rsh_env;
 418                 if (!cmd)
 419                         cmd = RSYNC_RSH;
 420                 cmd = need_to_free = strdup(cmd);
 421                 if (!cmd)
 422                         goto oom;
 423
 424                 for (t = f = cmd; *f; f++) {
 425                         if (*f == ' ')
 426                                 continue;
 427                         /* Comparison leaves rooms for server_options(). */
 428                         if (argc >= MAX_ARGS - MAX_SERVER_ARGS)
 429                                 goto arg_overflow;
 430                         args[argc++] = t;
 431                         while (*f != ' ' || in_quote) {
 432                                 if (!*f) {
 433                                         if (in_quote) {
 434                                                 rprintf(FERROR,
 435                                                     "Missing trailing-%c in remote-shell command.\n",
 436                                                     in_quote);
 437                                                 exit_cleanup(RERR_SYNTAX);
 438                                         }
 439                                         f--;
 440                                         break;
 441                                 }
 442                                 if (*f == '\'' || *f == '"') {
 443                                         if (!in_quote) {
 444                                                 in_quote = *f++;
 445                                                 continue;
 446                                         }
 447                                         if (*f == in_quote && *++f != in_quote) {
 448                                                 in_quote = '\0';
 449                                                 continue;
 450                                         }
 451                                 }
 452                                 *t++ = *f++;
 453                         }
 454                         *t++ = '\0';
 455                 }
 456
 457                 /* check to see if we've already been given '-l user' in
 458                  * the remote-shell command */
 459                 for (i = 0; i < argc-1; i++) {
 460                         if (!strcmp(args[i], "-l") && args[i+1][0] != '-')
 461                                 dash_l_set = 1;
 462                 }
 463
 464 #ifdef HAVE_REMSH
 465                 /* remsh (on HPUX) takes the arguments the other way around */
 466                 args[argc++] = machine;
 467                 if (user && !(daemon_over_rsh && dash_l_set)) {
 468                         args[argc++] = "-l";
 469                         args[argc++] = user;
 470                 }
 471 #else
 472                 if (user && !(daemon_over_rsh && dash_l_set)) {
 473                         args[argc++] = "-l";
 474                         args[argc++] = user;
 475                 }
 476                 args[argc++] = machine;
 477 #endif
 478
 479                 args[argc++] = rsync_path;
 480
 481                 if (blocking_io < 0) {
 482                         char *cp;
 483                         if ((cp = strrchr(cmd, '/')) != NULL)
 484                                 cp++;
 485                         else
 486                                 cp = cmd;
 487                         if (strcmp(cp, "rsh") == 0 || strcmp(cp, "remsh") == 0)
 488                                 blocking_io = 1;
 489                 }
 490
 491                 server_options(args,&argc);
 492
 493                 if (argc >= MAX_ARGS - 2)
 494                         goto arg_overflow;
 495         }
 496
 497         args[argc++] = ".";
 498
 499         if (!daemon_over_rsh) {
 500                 while (remote_argc > 0) {
 501                         if (argc >= MAX_ARGS - 1) {
 502                           arg_overflow:
 503                                 rprintf(FERROR, "internal: args[] overflowed in do_cmd()\n");
 504                                 exit_cleanup(RERR_SYNTAX);
 505                         }
 506                         if (**remote_argv == '-') {
 507                                 if (asprintf(args + argc++, "./%s", *remote_argv++) < 0)
 508                                         out_of_memory("do_cmd");
 509                         } else
 510                                 args[argc++] = *remote_argv++;
 511                         remote_argc--;
 512                 }
 513         }
 514
 515         args[argc] = NULL;
 516
 517         if (DEBUG_GTE(CMD, 2)) {
 518                 for (i = 0; i < argc; i++)
 519                         rprintf(FCLIENT, "cmd[%d]=%s ", i, args[i]);
 520                 rprintf(FCLIENT, "\n");
 521         }
 522
 523         if (read_batch) {
 524                 int from_gen_pipe[2];
 525                 set_allow_inc_recurse();
 526                 if (fd_pair(from_gen_pipe) < 0) {
 527                         rsyserr(FERROR, errno, "pipe");
 528                         exit_cleanup(RERR_IPC);
 529                 }
 530                 batch_gen_fd = from_gen_pipe[0];
 531                 *f_out_p = from_gen_pipe[1];
 532                 *f_in_p = batch_fd;
 533                 pid = (pid_t)-1; /* no child pid */
 534 #ifdef ICONV_CONST
 535                 setup_iconv();
 536 #endif
 537         } else if (local_server) {
 538                 /* If the user didn't request --[no-]whole-file, force
 539                  * it on, but only if we're not batch processing. */
 540                 if (whole_file < 0 && !write_batch)
 541                         whole_file = 1;
 542                 set_allow_inc_recurse();
 543                 pid = local_child(argc, args, f_in_p, f_out_p, child_main);
 544 #ifdef ICONV_CONST
 545                 setup_iconv();
 546 #endif
 547         } else {
 548                 pid = piped_child(args, f_in_p, f_out_p);
 549 #ifdef ICONV_CONST
 550                 setup_iconv();
 551 #endif
 552                 if (protect_args && !daemon_over_rsh)
 553                         send_protected_args(*f_out_p, args);
 554         }
 555
 556         if (need_to_free)
 557                 free(need_to_free);
 558
 559         return pid;
 560
 561   oom:
 562         out_of_memory("do_cmd");
 563         return 0; /* not reached */
 564 }
 565
 566 /* The receiving side operates in one of two modes:
 567  *
 568  * 1. it receives any number of files into a destination directory,
 569  * placing them according to their names in the file-list.
 570  *
 571  * 2. it receives a single file and saves it using the name in the
 572  * destination path instead of its file-list name.  This requires a
 573  * "local name" for writing out the destination file.
 574  *
 575  * So, our task is to figure out what mode/local-name we need.
 576  * For mode 1, we change into the destination directory and return NULL.
 577  * For mode 2, we change into the directory containing the destination
 578  * file (if we aren't already there) and return the local-name. */
 579 static char *get_local_name(struct file_list *flist, char *dest_path)
 580 {
 581         STRUCT_STAT st;
 582         int statret;
 583         char *cp;
 584
 585         if (DEBUG_GTE(RECV, 1)) {
 586                 rprintf(FINFO, "get_local_name count=%d %s\n",
 587                         file_total, NS(dest_path));
 588         }
 589
 590         if (!dest_path || list_only)
 591                 return NULL;
 592
 593         /* Treat an empty string as a copy into the current directory. */
 594         if (!*dest_path)
 595             dest_path = ".";
 596
 597         if (daemon_filter_list.head) {
 598                 char *slash = strrchr(dest_path, '/');
 599                 if (slash && (slash[1] == '\0' || (slash[1] == '.' && slash[2] == '\0')))
 600                         *slash = '\0';
 601                 else
 602                         slash = NULL;
 603                 if ((*dest_path != '.' || dest_path[1] != '\0')
 604                  && (check_filter(&daemon_filter_list, FLOG, dest_path, 0) < 0
 605                   || check_filter(&daemon_filter_list, FLOG, dest_path, 1) < 0)) {
 606                         rprintf(FERROR, "ERROR: daemon has excluded destination \"%s\"\n",
 607                                 dest_path);
 608                         exit_cleanup(RERR_FILESELECT);
 609                 }
 610                 if (slash)
 611                         *slash = '/';
 612         }
 613
 614         /* See what currently exists at the destination. */
 615         if ((statret = do_stat(dest_path, &st)) == 0) {
 616                 /* If the destination is a dir, enter it and use mode 1. */
 617                 if (S_ISDIR(st.st_mode)) {
 618                         if (!change_dir(dest_path, CD_NORMAL)) {
 619                                 rsyserr(FERROR, errno, "change_dir#1 %s failed",
 620                                         full_fname(dest_path));
 621                                 exit_cleanup(RERR_FILESELECT);
 622                         }
 623                         filesystem_dev = st.st_dev; /* ensures --force works right w/-x */
 624                         return NULL;
 625                 }
 626                 if (file_total > 1) {
 627                         rprintf(FERROR,
 628                                 "ERROR: destination must be a directory when"
 629                                 " copying more than 1 file\n");
 630                         exit_cleanup(RERR_FILESELECT);
 631                 }
 632                 if (file_total == 1 && S_ISDIR(flist->files[0]->mode)) {
 633                         rprintf(FERROR,
 634                                 "ERROR: cannot overwrite non-directory"
 635                                 " with a directory\n");
 636                         exit_cleanup(RERR_FILESELECT);
 637                 }
 638         } else if (errno != ENOENT) {
 639                 /* If we don't know what's at the destination, fail. */
 640                 rsyserr(FERROR, errno, "ERROR: cannot stat destination %s",
 641                         full_fname(dest_path));
 642                 exit_cleanup(RERR_FILESELECT);
 643         }
 644
 645         cp = strrchr(dest_path, '/');
 646
 647         /* If we need a destination directory because the transfer is not
 648          * of a single non-directory or the user has requested one via a
 649          * destination path ending in a slash, create one and use mode 1. */
 650         if (file_total > 1 || (cp && !cp[1])) {
 651                 /* Lop off the final slash (if any). */
 652                 if (cp && !cp[1])
 653                         *cp = '\0';
 654
 655                 if (statret == 0) {
 656                         rprintf(FERROR,
 657                             "ERROR: destination path is not a directory\n");
 658                         exit_cleanup(RERR_SYNTAX);
 659                 }
 660
 661                 if (do_mkdir(dest_path, ACCESSPERMS) != 0) {
 662                         rsyserr(FERROR, errno, "mkdir %s failed",
 663                                 full_fname(dest_path));
 664                         exit_cleanup(RERR_FILEIO);
 665                 }
 666
 667                 if (flist->high >= flist->low
 668                  && strcmp(flist->files[flist->low]->basename, ".") == 0)
 669                         flist->files[0]->flags |= FLAG_DIR_CREATED;
 670
 671                 if (INFO_GTE(NAME, 1))
 672                         rprintf(FINFO, "created directory %s\n", dest_path);
 673
 674                 if (dry_run) {
 675                         /* Indicate that dest dir doesn't really exist. */
 676                         dry_run++;
 677                 }
 678
 679                 if (!change_dir(dest_path, dry_run > 1 ? CD_SKIP_CHDIR : CD_NORMAL)) {
 680                         rsyserr(FERROR, errno, "change_dir#2 %s failed",
 681                                 full_fname(dest_path));
 682                         exit_cleanup(RERR_FILESELECT);
 683                 }
 684
 685                 return NULL;
 686         }
 687
 688         /* Otherwise, we are writing a single file, possibly on top of an
 689          * existing non-directory.  Change to the item's parent directory
 690          * (if it has a path component), return the basename of the
 691          * destination file as the local name, and use mode 2. */
 692         if (!cp)
 693                 return dest_path;
 694
 695         if (cp == dest_path)
 696                 dest_path = "/";
 697
 698         *cp = '\0';
 699         if (!change_dir(dest_path, CD_NORMAL)) {
 700                 rsyserr(FERROR, errno, "change_dir#3 %s failed",
 701                         full_fname(dest_path));
 702                 exit_cleanup(RERR_FILESELECT);
 703         }
 704         *cp = '/';
 705
 706         return cp + 1;
 707 }
 708
 709 /* This function checks on our alternate-basis directories.  If we're in
 710  * dry-run mode and the destination dir does not yet exist, we'll try to
 711  * tweak any dest-relative paths to make them work for a dry-run (the
 712  * destination dir must be in curr_dir[] when this function is called).
 713  * We also warn about any arg that is non-existent or not a directory. */
 714 static void check_alt_basis_dirs(void)
 715 {
 716         STRUCT_STAT st;
 717         char *slash = strrchr(curr_dir, '/');
 718         int j;
 719
 720         for (j = 0; j < basis_dir_cnt; j++) {
 721                 char *bdir = basis_dir[j];
 722                 int bd_len = strlen(bdir);
 723                 if (bd_len > 1 && bdir[bd_len-1] == '/')
 724                         bdir[--bd_len] = '\0';
 725                 if (dry_run > 1 && *bdir != '/') {
 726                         int len = curr_dir_len + 1 + bd_len + 1;
 727                         char *new = new_array(char, len);
 728                         if (!new)
 729                                 out_of_memory("check_alt_basis_dirs");
 730                         if (slash && strncmp(bdir, "../", 3) == 0) {
 731                             /* We want to remove only one leading "../" prefix for
 732                              * the directory we couldn't create in dry-run mode:
 733                              * this ensures that any other ".." references get
 734                              * evaluated the same as they would for a live copy. */
 735                             *slash = '\0';
 736                             pathjoin(new, len, curr_dir, bdir + 3);
 737                             *slash = '/';
 738                         } else
 739                             pathjoin(new, len, curr_dir, bdir);
 740                         basis_dir[j] = bdir = new;
 741                 }
 742                 if (do_stat(bdir, &st) < 0)
 743                         rprintf(FWARNING, "%s arg does not exist: %s\n", dest_option, bdir);
 744                 else if (!S_ISDIR(st.st_mode))
 745                         rprintf(FWARNING, "%s arg is not a dir: %s\n", dest_option, bdir);
 746         }
 747 }
 748
 749 /* This is only called by the sender. */
 750 static void read_final_goodbye(int f_in, int f_out)
 751 {
 752         int i, iflags, xlen;
 753         uchar fnamecmp_type;
 754         char xname[MAXPATHLEN];
 755
 756         shutting_down = True;
 757
 758         if (protocol_version < 29)
 759                 i = read_int(f_in);
 760         else {
 761                 i = read_ndx_and_attrs(f_in, f_out, &iflags, &fnamecmp_type, xname, &xlen);
 762                 if (protocol_version >= 31 && i == NDX_DONE) {
 763                         if (am_sender)
 764                                 write_ndx(f_out, NDX_DONE);
 765                         else {
 766                                 if (batch_gen_fd >= 0) {
 767                                         while (read_int(batch_gen_fd) != NDX_DEL_STATS) {}
 768                                         read_del_stats(batch_gen_fd);
 769                                 }
 770                                 write_int(f_out, NDX_DONE);
 771                         }
 772                         i = read_ndx_and_attrs(f_in, f_out, &iflags, &fnamecmp_type, xname, &xlen);
 773                 }
 774         }
 775
 776         if (i != NDX_DONE) {
 777                 rprintf(FERROR, "Invalid packet at end of run (%d) [%s]\n",
 778                         i, who_am_i());
 779                 exit_cleanup(RERR_PROTOCOL);
 780         }
 781 }
 782
 783 static void do_server_sender(int f_in, int f_out, int argc, char *argv[])
 784 {
 785         struct file_list *flist;
 786         char *dir;
 787
 788         if (DEBUG_GTE(SEND, 1))
 789                 rprintf(FINFO, "server_sender starting pid=%d\n", (int)getpid());
 790
 791         if (am_daemon && lp_write_only(module_id)) {
 792                 rprintf(FERROR, "ERROR: module is write only\n");
 793                 exit_cleanup(RERR_SYNTAX);
 794         }
 795         if (am_daemon && read_only && remove_source_files) {
 796                 rprintf(FERROR,
 797                         "ERROR: --remove-%s-files cannot be used with a read-only module\n",
 798                         remove_source_files == 1 ? "source" : "sent");
 799                 exit_cleanup(RERR_SYNTAX);
 800         }
 801         if (argc < 1) {
 802                 rprintf(FERROR, "ERROR: do_server_sender called without args\n");
 803                 exit_cleanup(RERR_SYNTAX);
 804         }
 805
 806         dir = argv[0];
 807         if (!relative_paths) {
 808                 if (!change_dir(dir, CD_NORMAL)) {
 809                         rsyserr(FERROR, errno, "change_dir#3 %s failed",
 810                                 full_fname(dir));
 811                         exit_cleanup(RERR_FILESELECT);
 812                 }
 813         }
 814         argc--;
 815         argv++;
 816
 817         if (argc == 0 && (recurse || xfer_dirs || list_only)) {
 818                 argc = 1;
 819                 argv--;
 820                 argv[0] = ".";
 821         }
 822
 823         flist = send_file_list(f_out,argc,argv);
 824         if (!flist || flist->used == 0) {
 825                 /* Make sure input buffering is off so we can't hang in noop_io_until_death(). */
 826                 io_end_buffering_in(0);
 827                 /* TODO:  we should really exit in a more controlled manner. */
 828                 exit_cleanup(0);
 829         }
 830
 831         io_start_buffering_in(f_in);
 832
 833         send_files(f_in, f_out);
 834         io_flush(FULL_FLUSH);
 835         handle_stats(f_out);
 836         if (protocol_version >= 24)
 837                 read_final_goodbye(f_in, f_out);
 838         io_flush(FULL_FLUSH);
 839         exit_cleanup(0);
 840 }
 841
 842
 843 static int do_recv(int f_in, int f_out, char *local_name)
 844 {
 845         int pid;
 846         int exit_code = 0;
 847         int error_pipe[2];
 848
 849         /* The receiving side mustn't obey this, or an existing symlink that
 850          * points to an identical file won't be replaced by the referent. */
 851         copy_links = copy_dirlinks = copy_unsafe_links = 0;
 852
 853 #ifdef SUPPORT_HARD_LINKS
 854         if (preserve_hard_links && !inc_recurse)
 855                 match_hard_links(first_flist);
 856 #endif
 857
 858         if (fd_pair(error_pipe) < 0) {
 859                 rsyserr(FERROR, errno, "pipe failed in do_recv");
 860                 exit_cleanup(RERR_IPC);
 861         }
 862
 863         if (backup_dir) {
 864                 STRUCT_STAT st;
 865                 int ret;
 866                 if (backup_dir_len > 1)
 867                         backup_dir_buf[backup_dir_len-1] = '\0';
 868                 ret = do_stat(backup_dir_buf, &st);
 869                 if (ret != 0 || !S_ISDIR(st.st_mode)) {
 870                         if (ret == 0) {
 871                                 rprintf(FERROR, "The backup-dir is not a directory: %s\n", backup_dir_buf);
 872                                 exit_cleanup(RERR_SYNTAX);
 873                         }
 874                         if (errno != ENOENT) {
 875                                 rprintf(FERROR, "Failed to stat %s: %s\n", backup_dir_buf, strerror(errno));
 876                                 exit_cleanup(RERR_FILEIO);
 877                         }
 878                         if (INFO_GTE(BACKUP, 1))
 879                                 rprintf(FINFO, "(new) backup_dir is %s\n", backup_dir_buf);
 880                 } else if (INFO_GTE(BACKUP, 1))
 881                         rprintf(FINFO, "backup_dir is %s\n", backup_dir_buf);
 882                 if (backup_dir_len > 1)
 883                         backup_dir_buf[backup_dir_len-1] = '/';
 884         }
 885
 886         io_flush(FULL_FLUSH);
 887
 888         if ((pid = do_fork()) == -1) {
 889                 rsyserr(FERROR, errno, "fork failed in do_recv");
 890                 exit_cleanup(RERR_IPC);
 891         }
 892
 893         if (pid == 0) {
 894                 am_receiver = 1;
 895                 send_msgs_to_gen = am_server;
 896
 897                 close(error_pipe[0]);
 898
 899                 /* We can't let two processes write to the socket at one time. */
 900                 io_end_multiplex_out(MPLX_SWITCHING);
 901                 if (f_in != f_out)
 902                         close(f_out);
 903                 sock_f_out = -1;
 904                 f_out = error_pipe[1];
 905
 906                 bwlimit_writemax = 0; /* receiver doesn't need to do this */
 907
 908                 if (read_batch)
 909                         io_start_buffering_in(f_in);
 910                 io_start_multiplex_out(f_out);
 911
 912                 recv_files(f_in, f_out, local_name);
 913                 io_flush(FULL_FLUSH);
 914                 handle_stats(f_in);
 915
 916                 if (output_needs_newline) {
 917                         fputc('\n', stdout);
 918                         output_needs_newline = 0;
 919                 }
 920
 921                 write_int(f_out, NDX_DONE);
 922                 send_msg(MSG_STATS, (char*)&stats.total_read, sizeof stats.total_read, 0);
 923                 io_flush(FULL_FLUSH);
 924
 925                 /* Handle any keep-alive packets from the post-processing work
 926                  * that the generator does. */
 927                 if (protocol_version >= 29) {
 928                         kluge_around_eof = -1;
 929
 930                         /* This should only get stopped via a USR2 signal. */
 931                         read_final_goodbye(f_in, f_out);
 932
 933                         rprintf(FERROR, "Invalid packet at end of run [%s]\n",
 934                                 who_am_i());
 935                         exit_cleanup(RERR_PROTOCOL);
 936                 }
 937
 938                 /* Finally, we go to sleep until our parent kills us with a
 939                  * USR2 signal.  We sleep for a short time, as on some OSes
 940                  * a signal won't interrupt a sleep! */
 941                 while (1)
 942                         msleep(20);
 943         }
 944
 945         am_generator = 1;
 946         flist_receiving_enabled = True;
 947
 948         io_end_multiplex_in(MPLX_SWITCHING);
 949         if (write_batch && !am_server)
 950                 stop_write_batch();
 951
 952         close(error_pipe[1]);
 953         if (f_in != f_out)
 954                 close(f_in);
 955         sock_f_in = -1;
 956         f_in = error_pipe[0];
 957
 958         io_start_buffering_out(f_out);
 959         io_start_multiplex_in(f_in);
 960
 961 #ifdef SUPPORT_HARD_LINKS
 962         if (preserve_hard_links && inc_recurse) {
 963                 struct file_list *flist;
 964                 for (flist = first_flist; flist; flist = flist->next)
 965                         match_hard_links(flist);
 966         }
 967 #endif
 968
 969         generate_files(f_out, local_name);
 970
 971         handle_stats(-1);
 972         io_flush(FULL_FLUSH);
 973         shutting_down = True;
 974         if (protocol_version >= 24) {
 975                 /* send a final goodbye message */
 976                 write_ndx(f_out, NDX_DONE);
 977         }
 978         io_flush(FULL_FLUSH);
 979
 980         kill(pid, SIGUSR2);
 981         wait_process_with_flush(pid, &exit_code);
 982         return exit_code;
 983 }
 984
 985 static void do_server_recv(int f_in, int f_out, int argc, char *argv[])
 986 {
 987         int exit_code;
 988         struct file_list *flist;
 989         char *local_name = NULL;
 990         int negated_levels;
 991
 992         if (filesfrom_fd >= 0 && !msgs2stderr && protocol_version < 31) {
 993                 /* We can't mix messages with files-from data on the socket,
 994                  * so temporarily turn off info/debug messages. */
 995                 negate_output_levels();
 996                 negated_levels = 1;
 997         } else
 998                 negated_levels = 0;
 999
1000         if (DEBUG_GTE(RECV, 1))
1001                 rprintf(FINFO, "server_recv(%d) starting pid=%d\n", argc, (int)getpid());
1002
1003         if (am_daemon && read_only) {
1004                 rprintf(FERROR,"ERROR: module is read only\n");
1005                 exit_cleanup(RERR_SYNTAX);
1006                 return;
1007         }
1008
1009         if (argc > 0) {
1010                 char *dir = argv[0];
1011                 argc--;
1012                 argv++;
1013                 if (!am_daemon && !change_dir(dir, CD_NORMAL)) {
1014                         rsyserr(FERROR, errno, "change_dir#4 %s failed",
1015                                 full_fname(dir));
1016                         exit_cleanup(RERR_FILESELECT);
1017                 }
1018         }
1019
1020         if (protocol_version >= 30)
1021                 io_start_multiplex_in(f_in);
1022         else
1023                 io_start_buffering_in(f_in);
1024         recv_filter_list(f_in);
1025
1026         if (filesfrom_fd >= 0) {
1027                 /* We need to send the files-from names to the sender at the
1028                  * same time that we receive the file-list from them, so we
1029                  * need the IO routines to automatically write out the names
1030                  * onto our f_out socket as we read the file-list.  This
1031                  * avoids both deadlock and extra delays/buffers. */
1032                 start_filesfrom_forwarding(filesfrom_fd);
1033                 filesfrom_fd = -1;
1034         }
1035
1036         flist = recv_file_list(f_in, -1);
1037         if (!flist) {
1038                 rprintf(FERROR,"server_recv: recv_file_list error\n");
1039                 exit_cleanup(RERR_FILESELECT);
1040         }
1041         if (inc_recurse && file_total == 1)
1042                 recv_additional_file_list(f_in);
1043
1044         if (negated_levels)
1045                 negate_output_levels();
1046
1047         if (argc > 0)
1048                 local_name = get_local_name(flist,argv[0]);
1049
1050         /* Now that we know what our destination directory turned out to be,
1051          * we can sanitize the --link-/copy-/compare-dest args correctly. */
1052         if (sanitize_paths) {
1053                 char **dir_p;
1054                 for (dir_p = basis_dir; *dir_p; dir_p++)
1055                         *dir_p = sanitize_path(NULL, *dir_p, NULL, curr_dir_depth, SP_DEFAULT);
1056                 if (partial_dir)
1057                         partial_dir = sanitize_path(NULL, partial_dir, NULL, curr_dir_depth, SP_DEFAULT);
1058         }
1059         check_alt_basis_dirs();
1060
1061         if (daemon_filter_list.head) {
1062                 char **dir_p;
1063                 filter_rule_list *elp = &daemon_filter_list;
1064
1065                 for (dir_p = basis_dir; *dir_p; dir_p++) {
1066                         char *dir = *dir_p;
1067                         if (*dir == '/')
1068                                 dir += module_dirlen;
1069                         if (check_filter(elp, FLOG, dir, 1) < 0)
1070                                 goto options_rejected;
1071                 }
1072                 if (partial_dir && *partial_dir == '/'
1073                  && check_filter(elp, FLOG, partial_dir + module_dirlen, 1) < 0) {
1074                     options_rejected:
1075                         rprintf(FERROR,
1076                                 "Your options have been rejected by the server.\n");
1077                         exit_cleanup(RERR_SYNTAX);
1078                 }
1079         }
1080
1081         exit_code = do_recv(f_in, f_out, local_name);
1082         exit_cleanup(exit_code);
1083 }
1084
1085
1086 int child_main(int argc, char *argv[])
1087 {
1088         start_server(STDIN_FILENO, STDOUT_FILENO, argc, argv);
1089         return 0;
1090 }
1091
1092
1093 void start_server(int f_in, int f_out, int argc, char *argv[])
1094 {
1095         set_nonblocking(f_in);
1096         set_nonblocking(f_out);
1097
1098         io_set_sock_fds(f_in, f_out);
1099         setup_protocol(f_out, f_in);
1100
1101         if (protocol_version >= 23)
1102                 io_start_multiplex_out(f_out);
1103         if (am_daemon && io_timeout && protocol_version >= 31)
1104                 send_msg_int(MSG_IO_TIMEOUT, io_timeout);
1105
1106         if (am_sender) {
1107                 keep_dirlinks = 0; /* Must be disabled on the sender. */
1108                 if (need_messages_from_generator)
1109                         io_start_multiplex_in(f_in);
1110                 else
1111                         io_start_buffering_in(f_in);
1112                 recv_filter_list(f_in);
1113                 do_server_sender(f_in, f_out, argc, argv);
1114         } else
1115                 do_server_recv(f_in, f_out, argc, argv);
1116         exit_cleanup(0);
1117 }
1118
1119 /* This is called once the connection has been negotiated.  It is used
1120  * for rsyncd, remote-shell, and local connections. */
1121 int client_run(int f_in, int f_out, pid_t pid, int argc, char *argv[])
1122 {
1123         struct file_list *flist = NULL;
1124         int exit_code = 0, exit_code2 = 0;
1125         char *local_name = NULL;
1126
1127         cleanup_child_pid = pid;
1128         if (!read_batch) {
1129                 set_nonblocking(f_in);
1130                 set_nonblocking(f_out);
1131         }
1132
1133         io_set_sock_fds(f_in, f_out);
1134         setup_protocol(f_out,f_in);
1135
1136         /* We set our stderr file handle to blocking because ssh might have
1137          * set it to non-blocking.  This can be particularly troublesome if
1138          * stderr is a clone of stdout, because ssh would have set our stdout
1139          * to non-blocking at the same time (which can easily cause us to lose
1140          * output from our print statements).  This kluge shouldn't cause ssh
1141          * any problems for how we use it.  Note also that we delayed setting
1142          * this until after the above protocol setup so that we know for sure
1143          * that ssh is done twiddling its file descriptors.  */
1144         set_blocking(STDERR_FILENO);
1145
1146         if (am_sender) {
1147                 keep_dirlinks = 0; /* Must be disabled on the sender. */
1148
1149                 if (always_checksum
1150                  && (log_format_has(stdout_format, 'C')
1151                   || log_format_has(logfile_format, 'C')))
1152                         sender_keeps_checksum = 1;
1153
1154                 if (protocol_version >= 30)
1155                         io_start_multiplex_out(f_out);
1156                 else
1157                         io_start_buffering_out(f_out);
1158                 if (protocol_version >= 31 || (!filesfrom_host && protocol_version >= 23))
1159                         io_start_multiplex_in(f_in);
1160                 else
1161                         io_start_buffering_in(f_in);
1162                 send_filter_list(f_out);
1163                 if (filesfrom_host)
1164                         filesfrom_fd = f_in;
1165
1166                 if (write_batch && !am_server)
1167                         start_write_batch(f_out);
1168                 flist = send_file_list(f_out, argc, argv);
1169                 if (DEBUG_GTE(FLIST, 3))
1170                         rprintf(FINFO,"file list sent\n");
1171
1172                 if (protocol_version < 31 && filesfrom_host && protocol_version >= 23)
1173                         io_start_multiplex_in(f_in);
1174
1175                 io_flush(NORMAL_FLUSH);
1176                 send_files(f_in, f_out);
1177                 io_flush(FULL_FLUSH);
1178                 handle_stats(-1);
1179                 if (protocol_version >= 24)
1180                         read_final_goodbye(f_in, f_out);
1181                 if (pid != -1) {
1182                         if (DEBUG_GTE(EXIT, 2))
1183                                 rprintf(FINFO,"client_run waiting on %d\n", (int) pid);
1184                         io_flush(FULL_FLUSH);
1185                         wait_process_with_flush(pid, &exit_code);
1186                 }
1187                 output_summary();
1188                 io_flush(FULL_FLUSH);
1189                 exit_cleanup(exit_code);
1190         }
1191
1192         if (!read_batch) {
1193                 if (protocol_version >= 23)
1194                         io_start_multiplex_in(f_in);
1195                 if (need_messages_from_generator)
1196                         io_start_multiplex_out(f_out);
1197                 else
1198                         io_start_buffering_out(f_out);
1199         }
1200
1201         send_filter_list(read_batch ? -1 : f_out);
1202
1203         if (filesfrom_fd >= 0) {
1204                 start_filesfrom_forwarding(filesfrom_fd);
1205                 filesfrom_fd = -1;
1206         }
1207
1208         if (write_batch && !am_server)
1209                 start_write_batch(f_in);
1210         flist = recv_file_list(f_in, -1);
1211         if (inc_recurse && file_total == 1)
1212                 recv_additional_file_list(f_in);
1213
1214         if (flist && flist->used > 0) {
1215                 local_name = get_local_name(flist, argv[0]);
1216
1217                 check_alt_basis_dirs();
1218
1219                 exit_code2 = do_recv(f_in, f_out, local_name);
1220         } else {
1221                 handle_stats(-1);
1222                 output_summary();
1223         }
1224
1225         if (pid != -1) {
1226                 if (DEBUG_GTE(RECV, 1))
1227                         rprintf(FINFO,"client_run2 waiting on %d\n", (int) pid);
1228                 io_flush(FULL_FLUSH);
1229                 wait_process_with_flush(pid, &exit_code);
1230         }
1231
1232         return MAX(exit_code, exit_code2);
1233 }
1234
1235 static int copy_argv(char *argv[])
1236 {
1237         int i;
1238
1239         for (i = 0; argv[i]; i++) {
1240                 if (!(argv[i] = strdup(argv[i]))) {
1241                         rprintf (FERROR, "out of memory at %s(%d)\n",
1242                                  __FILE__, __LINE__);
1243                         return RERR_MALLOC;
1244                 }
1245         }
1246
1247         return 0;
1248 }
1249
1250
1251 /* Start a client for either type of remote connection.  Work out
1252  * whether the arguments request a remote shell or rsyncd connection,
1253  * and call the appropriate connection function, then run_client.
1254  *
1255  * Calls either start_socket_client (for sockets) or do_cmd and
1256  * client_run (for ssh). */
1257 static int start_client(int argc, char *argv[])
1258 {
1259         char *p, *shell_machine = NULL, *shell_user = NULL;
1260         char **remote_argv;
1261         int remote_argc;
1262         int f_in, f_out;
1263         int ret;
1264         pid_t pid;
1265
1266         /* Don't clobber argv[] so that ps(1) can still show the right
1267          * command line. */
1268         if ((ret = copy_argv(argv)) != 0)
1269                 return ret;
1270
1271         if (!read_batch) { /* for read_batch, NO source is specified */
1272                 char *path = check_for_hostspec(argv[0], &shell_machine, &rsync_port);
1273                 if (path) { /* source is remote */
1274                         char *dummy_host;
1275                         int dummy_port = 0;
1276                         *argv = path;
1277                         remote_argv = argv;
1278                         remote_argc = argc;
1279                         argv += argc - 1;
1280                         if (argc == 1 || **argv == ':')
1281                                 argc = 0; /* no dest arg */
1282                         else if (check_for_hostspec(*argv, &dummy_host, &dummy_port)) {
1283                                 rprintf(FERROR,
1284                                         "The source and destination cannot both be remote.\n");
1285                                 exit_cleanup(RERR_SYNTAX);
1286                         } else {
1287                                 remote_argc--; /* don't count dest */
1288                                 argc = 1;
1289                         }
1290                         if (filesfrom_host && *filesfrom_host
1291                             && strcmp(filesfrom_host, shell_machine) != 0) {
1292                                 rprintf(FERROR,
1293                                         "--files-from hostname is not the same as the transfer hostname\n");
1294                                 exit_cleanup(RERR_SYNTAX);
1295                         }
1296                         am_sender = 0;
1297                         if (rsync_port)
1298                                 daemon_over_rsh = shell_cmd ? 1 : -1;
1299                 } else { /* source is local, check dest arg */
1300                         am_sender = 1;
1301
1302                         if (argc > 1) {
1303                                 p = argv[--argc];
1304                                 remote_argv = argv + argc;
1305                         } else {
1306                                 static char *dotarg[1] = { "." };
1307                                 p = dotarg[0];
1308                                 remote_argv = dotarg;
1309                         }
1310                         remote_argc = 1;
1311
1312                         path = check_for_hostspec(p, &shell_machine, &rsync_port);
1313                         if (path && filesfrom_host && *filesfrom_host
1314                             && strcmp(filesfrom_host, shell_machine) != 0) {
1315                                 rprintf(FERROR,
1316                                         "--files-from hostname is not the same as the transfer hostname\n");
1317                                 exit_cleanup(RERR_SYNTAX);
1318                         }
1319                         if (!path) { /* no hostspec found, so src & dest are local */
1320                                 local_server = 1;
1321                                 if (filesfrom_host) {
1322                                         rprintf(FERROR,
1323                                                 "--files-from cannot be remote when the transfer is local\n");
1324                                         exit_cleanup(RERR_SYNTAX);
1325                                 }
1326                                 shell_machine = NULL;
1327                         } else { /* hostspec was found, so dest is remote */
1328                                 argv[argc] = path;
1329                                 if (rsync_port)
1330                                         daemon_over_rsh = shell_cmd ? 1 : -1;
1331                         }
1332                 }
1333         } else {  /* read_batch */
1334                 local_server = 1;
1335                 if (check_for_hostspec(argv[argc-1], &shell_machine, &rsync_port)) {
1336                         rprintf(FERROR, "remote destination is not allowed with --read-batch\n");
1337                         exit_cleanup(RERR_SYNTAX);
1338                 }
1339                 remote_argv = argv += argc - 1;
1340                 remote_argc = argc = 1;
1341         }
1342
1343         if (!rsync_port && remote_argc && !**remote_argv) /* Turn an empty arg into a dot dir. */
1344                 *remote_argv = ".";
1345
1346         if (am_sender) {
1347                 char *dummy_host;
1348                 int dummy_port = rsync_port;
1349                 int i;
1350                 /* For local source, extra source args must not have hostspec. */
1351                 for (i = 1; i < argc; i++) {
1352                         if (check_for_hostspec(argv[i], &dummy_host, &dummy_port)) {
1353                                 rprintf(FERROR, "Unexpected remote arg: %s\n", argv[i]);
1354                                 exit_cleanup(RERR_SYNTAX);
1355                         }
1356                 }
1357         } else {
1358                 char *dummy_host;
1359                 int dummy_port = rsync_port;
1360                 int i;
1361                 /* For remote source, any extra source args must have either
1362                  * the same hostname or an empty hostname. */
1363                 for (i = 1; i < remote_argc; i++) {
1364                         char *arg = check_for_hostspec(remote_argv[i], &dummy_host, &dummy_port);
1365                         if (!arg) {
1366                                 rprintf(FERROR, "Unexpected local arg: %s\n", remote_argv[i]);
1367                                 rprintf(FERROR, "If arg is a remote file/dir, prefix it with a colon (:).\n");
1368                                 exit_cleanup(RERR_SYNTAX);
1369                         }
1370                         if (*dummy_host && strcmp(dummy_host, shell_machine) != 0) {
1371                                 rprintf(FERROR, "All source args must come from the same machine.\n");
1372                                 exit_cleanup(RERR_SYNTAX);
1373                         }
1374                         if (rsync_port != dummy_port) {
1375                                 if (!rsync_port || !dummy_port)
1376                                         rprintf(FERROR, "All source args must use the same hostspec format.\n");
1377                                 else
1378                                         rprintf(FERROR, "All source args must use the same port number.\n");
1379                                 exit_cleanup(RERR_SYNTAX);
1380                         }
1381                         if (!rsync_port && !*arg) /* Turn an empty arg into a dot dir. */
1382                                 arg = ".";
1383                         remote_argv[i] = arg;
1384                 }
1385         }
1386
1387         if (daemon_over_rsh < 0)
1388                 return start_socket_client(shell_machine, remote_argc, remote_argv, argc, argv);
1389
1390         if (password_file && !daemon_over_rsh) {
1391                 rprintf(FERROR, "The --password-file option may only be "
1392                                 "used when accessing an rsync daemon.\n");
1393                 exit_cleanup(RERR_SYNTAX);
1394         }
1395
1396         if (connect_timeout) {
1397                 rprintf(FERROR, "The --contimeout option may only be "
1398                                 "used when connecting to an rsync daemon.\n");
1399                 exit_cleanup(RERR_SYNTAX);
1400         }
1401
1402         if (shell_machine) {
1403                 p = strrchr(shell_machine,'@');
1404                 if (p) {
1405                         *p = 0;
1406                         shell_user = shell_machine;
1407                         shell_machine = p+1;
1408                 }
1409         }
1410
1411         if (DEBUG_GTE(CMD, 2)) {
1412                 rprintf(FINFO,"cmd=%s machine=%s user=%s path=%s\n",
1413                         NS(shell_cmd), NS(shell_machine), NS(shell_user),
1414                         NS(remote_argv[0]));
1415         }
1416
1417         pid = do_cmd(shell_cmd, shell_machine, shell_user, remote_argv, remote_argc,
1418                      &f_in, &f_out);
1419
1420         /* if we're running an rsync server on the remote host over a
1421          * remote shell command, we need to do the RSYNCD protocol first */
1422         if (daemon_over_rsh) {
1423                 int tmpret;
1424                 tmpret = start_inband_exchange(f_in, f_out, shell_user, remote_argc, remote_argv);
1425                 if (tmpret < 0)
1426                         return tmpret;
1427         }
1428
1429         ret = client_run(f_in, f_out, pid, argc, argv);
1430
1431         fflush(stdout);
1432         fflush(stderr);
1433
1434         return ret;
1435 }
1436
1437
1438 static void sigusr1_handler(UNUSED(int val))
1439 {
1440         exit_cleanup(RERR_SIGNAL1);
1441 }
1442
1443 static void sigusr2_handler(UNUSED(int val))
1444 {
1445         if (!am_server)
1446                 output_summary();
1447         close_all();
1448         if (got_xfer_error)
1449                 _exit(RERR_PARTIAL);
1450         _exit(0);
1451 }
1452
1453 void remember_children(UNUSED(int val))
1454 {
1455 #ifdef WNOHANG
1456         int cnt, status;
1457         pid_t pid;
1458         /* An empty waitpid() loop was put here by Tridge and we could never
1459          * get him to explain why he put it in, so rather than taking it
1460          * out we're instead saving the child exit statuses for later use.
1461          * The waitpid() loop presumably eliminates all possibility of leaving
1462          * zombie children, maybe that's why he did it. */
1463         while ((pid = waitpid(-1, &status, WNOHANG)) > 0) {
1464                 /* save the child's exit status */
1465                 for (cnt = 0; cnt < MAXCHILDPROCS; cnt++) {
1466                         if (pid_stat_table[cnt].pid == 0) {
1467                                 pid_stat_table[cnt].pid = pid;
1468                                 pid_stat_table[cnt].status = status;
1469                                 break;
1470                         }
1471                 }
1472         }
1473 #endif
1474 #ifndef HAVE_SIGACTION
1475         signal(SIGCHLD, remember_children);
1476 #endif
1477 }
1478
1479
1480 /**
1481  * This routine catches signals and tries to send them to gdb.
1482  *
1483  * Because it's called from inside a signal handler it ought not to
1484  * use too many library routines.
1485  *
1486  * @todo Perhaps use "screen -X" instead/as well, to help people
1487  * debugging without easy access to X.  Perhaps use an environment
1488  * variable, or just call a script?
1489  *
1490  * @todo The /proc/ magic probably only works on Linux (and
1491  * Solaris?)  Can we be more portable?
1492  **/
1493 #ifdef MAINTAINER_MODE
1494 const char *get_panic_action(void)
1495 {
1496         const char *cmd_fmt = getenv("RSYNC_PANIC_ACTION");
1497
1498         if (cmd_fmt)
1499                 return cmd_fmt;
1500         else
1501                 return "xterm -display :0 -T Panic -n Panic "
1502                         "-e gdb /proc/%d/exe %d";
1503 }
1504
1505
1506 /**
1507  * Handle a fatal signal by launching a debugger, controlled by $RSYNC_PANIC_ACTION.
1508  *
1509  * This signal handler is only installed if we were configured with
1510  * --enable-maintainer-mode.  Perhaps it should always be on and we
1511  * should just look at the environment variable, but I'm a bit leery
1512  * of a signal sending us into a busy loop.
1513  **/
1514 static void rsync_panic_handler(UNUSED(int whatsig))
1515 {
1516         char cmd_buf[300];
1517         int ret, pid_int = getpid();
1518
1519         snprintf(cmd_buf, sizeof cmd_buf, get_panic_action(), pid_int, pid_int);
1520
1521         /* Unless we failed to execute gdb, we allow the process to
1522          * continue.  I'm not sure if that's right. */
1523         ret = system(cmd_buf);
1524         if (ret)
1525                 _exit(ret);
1526 }
1527 #endif
1528
1529
1530 int main(int argc,char *argv[])
1531 {
1532         int ret;
1533         int orig_argc = argc;
1534         char **orig_argv = argv;
1535 #ifdef HAVE_SIGACTION
1536 # ifdef HAVE_SIGPROCMASK
1537         sigset_t sigmask;
1538
1539         sigemptyset(&sigmask);
1540 # endif
1541         sigact.sa_flags = SA_NOCLDSTOP;
1542 #endif
1543         SIGACTMASK(SIGUSR1, sigusr1_handler);
1544         SIGACTMASK(SIGUSR2, sigusr2_handler);
1545         SIGACTMASK(SIGCHLD, remember_children);
1546 #ifdef MAINTAINER_MODE
1547         SIGACTMASK(SIGSEGV, rsync_panic_handler);
1548         SIGACTMASK(SIGFPE, rsync_panic_handler);
1549         SIGACTMASK(SIGABRT, rsync_panic_handler);
1550         SIGACTMASK(SIGBUS, rsync_panic_handler);
1551 #endif
1552
1553         starttime = time(NULL);
1554         our_uid = MY_UID();
1555         our_gid = MY_GID();
1556         am_root = our_uid == 0;
1557
1558         memset(&stats, 0, sizeof(stats));
1559
1560         if (argc < 2) {
1561                 usage(FERROR);
1562                 exit_cleanup(RERR_SYNTAX);
1563         }
1564
1565         /* Get the umask for use in permission calculations.  We no longer set
1566          * it to zero; that is ugly and pointless now that all the callers that
1567          * relied on it have been reeducated to work with default ACLs. */
1568         umask(orig_umask = umask(0));
1569
1570 #if defined CONFIG_LOCALE && defined HAVE_SETLOCALE
1571         setlocale(LC_CTYPE, "");
1572 #endif
1573
1574         if (!parse_arguments(&argc, (const char ***) &argv)) {
1575                 /* FIXME: We ought to call the same error-handling
1576                  * code here, rather than relying on getopt. */
1577                 option_error();
1578                 exit_cleanup(RERR_SYNTAX);
1579         }
1580
1581         SIGACTMASK(SIGINT, sig_int);
1582         SIGACTMASK(SIGHUP, sig_int);
1583         SIGACTMASK(SIGTERM, sig_int);
1584 #if defined HAVE_SIGACTION && HAVE_SIGPROCMASK
1585         sigprocmask(SIG_UNBLOCK, &sigmask, NULL);
1586 #endif
1587
1588         /* Ignore SIGPIPE; we consistently check error codes and will
1589          * see the EPIPE. */
1590         SIGACTION(SIGPIPE, SIG_IGN);
1591 #ifdef SIGXFSZ
1592         SIGACTION(SIGXFSZ, SIG_IGN);
1593 #endif
1594
1595         /* Initialize change_dir() here because on some old systems getcwd
1596          * (implemented by forking "pwd" and reading its output) doesn't
1597          * work when there are other child processes.  Also, on all systems
1598          * that implement getcwd that way "pwd" can't be found after chroot. */
1599         change_dir(NULL, CD_NORMAL);
1600
1601         if ((write_batch || read_batch) && !am_server) {
1602                 if (write_batch)
1603                         write_batch_shell_file(orig_argc, orig_argv, argc);
1604
1605                 if (read_batch && strcmp(batch_name, "-") == 0)
1606                         batch_fd = STDIN_FILENO;
1607                 else {
1608                         batch_fd = do_open(batch_name,
1609                                    write_batch ? O_WRONLY | O_CREAT | O_TRUNC
1610                                    : O_RDONLY, S_IRUSR | S_IWUSR);
1611                 }
1612                 if (batch_fd < 0) {
1613                         rsyserr(FERROR, errno, "Batch file %s open error",
1614                                 full_fname(batch_name));
1615                         exit_cleanup(RERR_FILEIO);
1616                 }
1617                 if (read_batch)
1618                         read_stream_flags(batch_fd);
1619                 else
1620                         write_stream_flags(batch_fd);
1621         }
1622         if (write_batch < 0)
1623                 dry_run = 1;
1624
1625         if (am_server) {
1626 #ifdef ICONV_CONST
1627                 setup_iconv();
1628 #endif
1629         } else if (am_daemon)
1630                 return daemon_main();
1631
1632         if (am_server && protect_args) {
1633                 char buf[MAXPATHLEN];
1634                 protect_args = 2;
1635                 read_args(STDIN_FILENO, NULL, buf, sizeof buf, 1, &argv, &argc, NULL);
1636                 if (!parse_arguments(&argc, (const char ***) &argv)) {
1637                         option_error();
1638                         exit_cleanup(RERR_SYNTAX);
1639                 }
1640         }
1641
1642         if (argc < 1) {
1643                 usage(FERROR);
1644                 exit_cleanup(RERR_SYNTAX);
1645         }
1646
1647         if (am_server) {
1648                 set_nonblocking(STDIN_FILENO);
1649                 set_nonblocking(STDOUT_FILENO);
1650                 if (am_daemon)
1651                         return start_daemon(STDIN_FILENO, STDOUT_FILENO);
1652                 start_server(STDIN_FILENO, STDOUT_FILENO, argc, argv);
1653         }
1654
1655         ret = start_client(argc, argv);
1656         if (ret == -1)
1657                 exit_cleanup(RERR_STARTCLIENT);
1658         else
1659                 exit_cleanup(ret);
1660
1661         return ret;
1662 }