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