main.c

   1 /*
   2  * The startup routines, including main(), for rsync.
   3  *
   4  * Copyright (C) 1996-2001 Andrew Tridgell <tridge@samba.org>
   5  * Copyright (C) 1996 Paul Mackerras
   6  * Copyright (C) 2001, 2002 Martin Pool <mbp@samba.org>
   7  * Copyright (C) 2003-2009 Wayne Davison
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 3 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License along
  20  * with this program; if not, visit the http://fsf.org website.
  21  */
  22
  23 #include "rsync.h"
  24 #include "inums.h"
  25 #include "io.h"
  26 #if defined CONFIG_LOCALE && defined HAVE_LOCALE_H
  27 #include <locale.h>
  28 #endif
  29
  30 extern int dry_run;
  31 extern int list_only;
  32 extern int io_timeout;
  33 extern int am_root;
  34 extern int am_server;
  35 extern int am_sender;
  36 extern int am_daemon;
  37 extern int inc_recurse;
  38 extern int blocking_io;
  39 extern int always_checksum;
  40 extern int remove_source_files;
  41 extern int output_needs_newline;
  42 extern int need_messages_from_generator;
  43 extern int kluge_around_eof;
  44 extern int got_xfer_error;
  45 extern int msgs2stderr;
  46 extern int module_id;
  47 extern int read_only;
  48 extern int copy_links;
  49 extern int copy_dirlinks;
  50 extern int copy_unsafe_links;
  51 extern int keep_dirlinks;
  52 extern int preserve_hard_links;
  53 extern int protocol_version;
  54 extern int file_total;
  55 extern int recurse;
  56 extern int xfer_dirs;
  57 extern int protect_args;
  58 extern int relative_paths;
  59 extern int sanitize_paths;
  60 extern int curr_dir_depth;
  61 extern int curr_dir_len;
  62 extern int module_id;
  63 extern int rsync_port;
  64 extern int whole_file;
  65 extern int read_batch;
  66 extern int write_batch;
  67 extern int batch_fd;
  68 extern int sock_f_in;
  69 extern int sock_f_out;
  70 extern int filesfrom_fd;
  71 extern int connect_timeout;
  72 extern int send_msgs_to_gen;
  73 extern pid_t cleanup_child_pid;
  74 extern size_t bwlimit_writemax;
  75 extern unsigned int module_dirlen;
  76 extern BOOL flist_receiving_enabled;
  77 extern BOOL shutting_down;
  78 extern struct stats stats;
  79 extern char *stdout_format;
  80 extern char *logfile_format;
  81 extern char *filesfrom_host;
  82 extern char *partial_dir;
  83 extern char *dest_option;
  84 extern char *rsync_path;
  85 extern char *shell_cmd;
  86 extern char *batch_name;
  87 extern char *password_file;
  88 extern char *backup_dir;
  89 extern char curr_dir[MAXPATHLEN];
  90 extern char backup_dir_buf[MAXPATHLEN];
  91 extern char *basis_dir[MAX_BASIS_DIRS+1];
  92 extern struct file_list *first_flist;
  93 extern filter_rule_list daemon_filter_list;
  94
  95 uid_t our_uid;
  96 gid_t our_gid;
  97 int am_receiver = 0;  /* Only set to 1 after the receiver/generator fork. */
  98 int am_generator = 0; /* Only set to 1 after the receiver/generator fork. */
  99 int local_server = 0;
 100 int daemon_over_rsh = 0;
 101 mode_t orig_umask = 0;
 102 int batch_gen_fd = -1;
 103 int sender_keeps_checksum = 0;
 104
 105 /* There's probably never more than at most 2 outstanding child processes,
 106  * but set it higher, just in case. */
 107 #define MAXCHILDPROCS 7
 108
 109 #ifdef HAVE_SIGACTION
 110 # ifdef HAVE_SIGPROCMASK
 111 #  define SIGACTMASK(n,h) SIGACTION(n,h), sigaddset(&sigmask,(n))
 112 # else
 113 #  define SIGACTMASK(n,h) SIGACTION(n,h)
 114 # endif
 115 static struct sigaction sigact;
 116 #endif
 117
 118 struct pid_status {
 119         pid_t pid;
 120         int status;
 121 } pid_stat_table[MAXCHILDPROCS];
 122
 123 static time_t starttime, endtime;
 124 static int64 total_read, total_written;
 125
 126 static void show_malloc_stats(void);
 127
 128 /* Works like waitpid(), but if we already harvested the child pid in our
 129  * remember_children(), we succeed instead of returning an error. */
 130 pid_t wait_process(pid_t pid, int *status_ptr, int flags)
 131 {
 132         pid_t waited_pid;
 133
 134         do {
 135                 waited_pid = waitpid(pid, status_ptr, flags);
 136         } while (waited_pid == -1 && errno == EINTR);
 137
 138         if (waited_pid == -1 && errno == ECHILD) {
 139                 /* Status of requested child no longer available:  check to
 140                  * see if it was processed by remember_children(). */
 141                 int cnt;
 142                 for (cnt = 0; cnt < MAXCHILDPROCS; cnt++) {
 143                         if (pid == pid_stat_table[cnt].pid) {
 144                                 *status_ptr = pid_stat_table[cnt].status;
 145                                 pid_stat_table[cnt].pid = 0;
 146                                 return pid;
 147                         }
 148                 }
 149         }
 150
 151         return waited_pid;
 152 }
 153
 154 /* Wait for a process to exit, calling io_flush while waiting. */
 155 static void wait_process_with_flush(pid_t pid, int *exit_code_ptr)
 156 {
 157         pid_t waited_pid;
 158         int status;
 159
 160         while ((waited_pid = wait_process(pid, &status, WNOHANG)) == 0) {
 161                 msleep(20);
 162                 io_flush(FULL_FLUSH);
 163         }
 164
 165         /* TODO: If the child exited on a signal, then log an
 166          * appropriate error message.  Perhaps we should also accept a
 167          * message describing the purpose of the child.  Also indicate
 168          * this to the caller so that they know something went wrong. */
 169         if (waited_pid < 0) {
 170                 rsyserr(FERROR, errno, "waitpid");
 171                 *exit_code_ptr = RERR_WAITCHILD;
 172         } else if (!WIFEXITED(status)) {
 173 #ifdef WCOREDUMP
 174                 if (WCOREDUMP(status))
 175                         *exit_code_ptr = RERR_CRASHED;
 176                 else
 177 #endif
 178                 if (WIFSIGNALED(status))
 179                         *exit_code_ptr = RERR_TERMINATED;
 180                 else
 181                         *exit_code_ptr = RERR_WAITCHILD;
 182         } else
 183                 *exit_code_ptr = WEXITSTATUS(status);
 184 }
 185
 186 void write_del_stats(int f)
 187 {
 188         if (read_batch)
 189                 write_int(f, NDX_DEL_STATS);
 190         else
 191                 write_ndx(f, NDX_DEL_STATS);
 192         write_varint(f, stats.deleted_files - stats.deleted_dirs
 193                       - stats.deleted_symlinks - stats.deleted_devices
 194                       - stats.deleted_specials);
 195         write_varint(f, stats.deleted_dirs);
 196         write_varint(f, stats.deleted_symlinks);
 197         write_varint(f, stats.deleted_devices);
 198         write_varint(f, stats.deleted_specials);
 199 }
 200
 201 void read_del_stats(int f)
 202 {
 203         stats.deleted_files = read_varint(f);
 204         stats.deleted_files += stats.deleted_dirs = read_varint(f);
 205         stats.deleted_files += stats.deleted_symlinks = read_varint(f);
 206         stats.deleted_files += stats.deleted_devices = read_varint(f);
 207         stats.deleted_files += stats.deleted_specials = read_varint(f);
 208 }
 209
 210 /* This function gets called from all 3 processes.  We want the client side
 211  * to actually output the text, but the sender is the only process that has
 212  * all the stats we need.  So, if we're a client sender, we do the report.
 213  * If we're a server sender, we write the stats on the supplied fd.  If
 214  * we're the client receiver we read the stats from the supplied fd and do
 215  * the report.  All processes might also generate a set of debug stats, if
 216  * the verbose level is high enough (this is the only thing that the
 217  * generator process and the server receiver ever do here). */
 218 static void handle_stats(int f)
 219 {
 220         endtime = time(NULL);
 221
 222         /* Cache two stats because the read/write code can change it. */
 223         total_read = stats.total_read;
 224         total_written = stats.total_written;
 225
 226         if (INFO_GTE(STATS, 3)) {
 227                 /* These come out from every process */
 228                 show_malloc_stats();
 229                 show_flist_stats();
 230         }
 231
 232         if (am_generator)
 233                 return;
 234
 235         if (am_daemon) {
 236                 if (f == -1 || !am_sender)
 237                         return;
 238         }
 239
 240         if (am_server) {
 241                 if (am_sender) {
 242                         write_varlong30(f, total_read, 3);
 243                         write_varlong30(f, total_written, 3);
 244                         write_varlong30(f, stats.total_size, 3);
 245                         if (protocol_version >= 29) {
 246                                 write_varlong30(f, stats.flist_buildtime, 3);
 247                                 write_varlong30(f, stats.flist_xfertime, 3);
 248                         }
 249                 }
 250                 return;
 251         }
 252
 253         /* this is the client */
 254
 255         if (f < 0 && !am_sender) /* e.g. when we got an empty file list. */
 256                 ;
 257         else if (!am_sender) {
 258                 /* Read the first two in opposite order because the meaning of
 259                  * read/write swaps when switching from sender to receiver. */
 260                 total_written = read_varlong30(f, 3);
 261                 total_read = read_varlong30(f, 3);
 262                 stats.total_size = read_varlong30(f, 3);
 263                 if (protocol_version >= 29) {
 264                         stats.flist_buildtime = read_varlong30(f, 3);
 265                         stats.flist_xfertime = read_varlong30(f, 3);
 266                 }
 267         } else if (write_batch) {
 268                 /* The --read-batch process is going to be a client
 269                  * receiver, so we need to give it the stats. */
 270                 write_varlong30(batch_fd, total_read, 3);
 271                 write_varlong30(batch_fd, total_written, 3);
 272                 write_varlong30(batch_fd, stats.total_size, 3);
 273                 if (protocol_version >= 29) {
 274                         write_varlong30(batch_fd, stats.flist_buildtime, 3);
 275                         write_varlong30(batch_fd, stats.flist_xfertime, 3);
 276                 }
 277         }
 278 }
 279
 280 static void output_itemized_counts(const char *prefix, int *counts)
 281 {
 282         static char *labels[] = { "reg", "dir", "link", "dev", "special" };
 283         char buf[1024], *pre = " (";
 284         int j, len = 0;
 285         int total = counts[0];
 286         if (total) {
 287                 counts[0] -= counts[1] + counts[2] + counts[3] + counts[4];
 288                 for (j = 0; j < 5; j++) {
 289                         if (counts[j]) {
 290                                 len += snprintf(buf+len, sizeof buf - len - 2,
 291                                         "%s%s: %s",
 292                                         pre, labels[j], comma_num(counts[j]));
 293                                 pre = ", ";
 294                         }
 295                 }
 296                 buf[len++] = ')';
 297         }
 298         buf[len] = '\0';
 299         rprintf(FINFO, "%s: %s%s\n", prefix, comma_num(total), buf);
 300 }
 301
 302 static void output_summary(void)
 303 {
 304         if (INFO_GTE(STATS, 2)) {
 305                 rprintf(FCLIENT, "\n");
 306                 output_itemized_counts("Number of files", &stats.num_files);
 307                 if (protocol_version >= 29)
 308                         output_itemized_counts("Number of created files", &stats.created_files);
 309                 if (protocol_version >= 31)
 310                         output_itemized_counts("Number of deleted files", &stats.deleted_files);
 311                 rprintf(FINFO,"Number of regular files transferred: %s\n",
 312                         comma_num(stats.xferred_files));
 313                 rprintf(FINFO,"Total file size: %s bytes\n",
 314                         human_num(stats.total_size));
 315                 rprintf(FINFO,"Total transferred file size: %s bytes\n",
 316                         human_num(stats.total_transferred_size));
 317                 rprintf(FINFO,"Literal data: %s bytes\n",
 318                         human_num(stats.literal_data));
 319                 rprintf(FINFO,"Matched data: %s bytes\n",
 320                         human_num(stats.matched_data));
 321                 rprintf(FINFO,"File list size: %s\n",
 322                         human_num(stats.flist_size));
 323                 if (stats.flist_buildtime) {
 324                         rprintf(FINFO,
 325                                 "File list generation time: %s seconds\n",
 326                                 comma_dnum((double)stats.flist_buildtime / 1000, 3));
 327                         rprintf(FINFO,
 328                                 "File list transfer time: %s seconds\n",
 329                                 comma_dnum((double)stats.flist_xfertime / 1000, 3));
 330                 }
 331                 rprintf(FINFO,"Total bytes sent: %s\n",
 332                         human_num(total_written));
 333                 rprintf(FINFO,"Total bytes received: %s\n",
 334                         human_num(total_read));
 335         }
 336
 337         if (INFO_GTE(STATS, 1)) {
 338                 rprintf(FCLIENT, "\n");
 339                 rprintf(FINFO,
 340                         "sent %s bytes  received %s bytes  %s bytes/sec\n",
 341                         human_num(total_written), human_num(total_read),
 342                         human_dnum((total_written + total_read)/(0.5 + (endtime - starttime)), 2));
 343                 rprintf(FINFO, "total size is %s  speedup is %s%s\n",
 344                         human_num(stats.total_size),
 345                         comma_dnum((double)stats.total_size / (total_written+total_read), 2),
 346                         write_batch < 0 ? " (BATCH ONLY)" : dry_run ? " (DRY RUN)" : "");
 347         }
 348
 349         fflush(stdout);
 350         fflush(stderr);
 351 }
 352
 353
 354 /**
 355  * If our C library can get malloc statistics, then show them to FINFO
 356  **/
 357 static void show_malloc_stats(void)
 358 {
 359 #ifdef HAVE_MALLINFO
 360         struct mallinfo mi;
 361
 362         mi = mallinfo();
 363
 364         rprintf(FCLIENT, "\n");
 365         rprintf(FINFO, RSYNC_NAME "[%d] (%s%s%s) heap statistics:\n",
 366                 getpid(), am_server ? "server " : "",
 367                 am_daemon ? "daemon " : "", who_am_i());
 368         rprintf(FINFO, "  arena:     %10ld   (bytes from sbrk)\n",
 369                 (long)mi.arena);
 370         rprintf(FINFO, "  ordblks:   %10ld   (chunks not in use)\n",
 371                 (long)mi.ordblks);
 372         rprintf(FINFO, "  smblks:    %10ld\n",
 373                 (long)mi.smblks);
 374         rprintf(FINFO, "  hblks:     %10ld   (chunks from mmap)\n",
 375                 (long)mi.hblks);
 376         rprintf(FINFO, "  hblkhd:    %10ld   (bytes from mmap)\n",
 377                 (long)mi.hblkhd);
 378         rprintf(FINFO, "  allmem:    %10ld   (bytes from sbrk + mmap)\n",
 379                 (long)mi.arena + mi.hblkhd);
 380         rprintf(FINFO, "  usmblks:   %10ld\n",
 381                 (long)mi.usmblks);
 382         rprintf(FINFO, "  fsmblks:   %10ld\n",
 383                 (long)mi.fsmblks);
 384         rprintf(FINFO, "  uordblks:  %10ld   (bytes used)\n",
 385                 (long)mi.uordblks);
 386         rprintf(FINFO, "  fordblks:  %10ld   (bytes free)\n",
 387                 (long)mi.fordblks);
 388         rprintf(FINFO, "  keepcost:  %10ld   (bytes in releasable chunk)\n",
 389                 (long)mi.keepcost);
 390 #endif /* HAVE_MALLINFO */
 391 }
 392
 393
 394 /* Start the remote shell.   cmd may be NULL to use the default. */
 395 static pid_t do_cmd(char *cmd, char *machine, char *user, char **remote_argv, int remote_argc,
 396                     int *f_in_p, int *f_out_p)
 397 {
 398         int i, argc = 0;
 399         char *args[MAX_ARGS], *need_to_free = NULL;
 400         pid_t pid;
 401         int dash_l_set = 0;
 402
 403         if (!read_batch && !local_server) {
 404                 char *t, *f, in_quote = '\0';
 405                 char *rsh_env = getenv(RSYNC_RSH_ENV);
 406                 if (!cmd)
 407                         cmd = rsh_env;
 408                 if (!cmd)
 409                         cmd = RSYNC_RSH;
 410                 cmd = need_to_free = strdup(cmd);
 411                 if (!cmd)
 412                         goto oom;
 413
 414                 for (t = f = cmd; *f; f++) {
 415                         if (*f == ' ')
 416                                 continue;
 417                         /* Comparison leaves rooms for server_options(). */
 418                         if (argc >= MAX_ARGS - MAX_SERVER_ARGS)
 419                                 goto arg_overflow;
 420                         args[argc++] = t;
 421                         while (*f != ' ' || in_quote) {
 422                                 if (!*f) {
 423                                         if (in_quote) {
 424                                                 rprintf(FERROR,
 425                                                     "Missing trailing-%c in remote-shell command.\n",
 426                                                     in_quote);
 427                                                 exit_cleanup(RERR_SYNTAX);
 428                                         }
 429                                         f--;
 430                                         break;
 431                                 }
 432                                 if (*f == '\'' || *f == '"') {
 433                                         if (!in_quote) {
 434                                                 in_quote = *f++;
 435                                                 continue;
 436                                         }
 437                                         if (*f == in_quote && *++f != in_quote) {
 438                                                 in_quote = '\0';
 439                                                 continue;
 440                                         }
 441                                 }
 442                                 *t++ = *f++;
 443                         }
 444                         *t++ = '\0';
 445                 }
 446
 447                 /* check to see if we've already been given '-l user' in
 448                  * the remote-shell command */
 449                 for (i = 0; i < argc-1; i++) {
 450                         if (!strcmp(args[i], "-l") && args[i+1][0] != '-')
 451                                 dash_l_set = 1;
 452                 }
 453
 454 #ifdef HAVE_REMSH
 455                 /* remsh (on HPUX) takes the arguments the other way around */
 456                 args[argc++] = machine;
 457                 if (user && !(daemon_over_rsh && dash_l_set)) {
 458                         args[argc++] = "-l";
 459                         args[argc++] = user;
 460                 }
 461 #else
 462                 if (user && !(daemon_over_rsh && dash_l_set)) {
 463                         args[argc++] = "-l";
 464                         args[argc++] = user;
 465                 }
 466                 args[argc++] = machine;
 467 #endif
 468
 469                 args[argc++] = rsync_path;
 470
 471                 if (blocking_io < 0) {
 472                         char *cp;
 473                         if ((cp = strrchr(cmd, '/')) != NULL)
 474                                 cp++;
 475                         else
 476                                 cp = cmd;
 477                         if (strcmp(cp, "rsh") == 0 || strcmp(cp, "remsh") == 0)
 478                                 blocking_io = 1;
 479                 }
 480
 481                 server_options(args,&argc);
 482
 483                 if (argc >= MAX_ARGS - 2)
 484                         goto arg_overflow;
 485         }
 486
 487         args[argc++] = ".";
 488
 489         if (!daemon_over_rsh) {
 490                 while (remote_argc > 0) {
 491                         if (argc >= MAX_ARGS - 1) {
 492                           arg_overflow:
 493                                 rprintf(FERROR, "internal: args[] overflowed in do_cmd()\n");
 494                                 exit_cleanup(RERR_SYNTAX);
 495                         }
 496                         if (**remote_argv == '-') {
 497                                 if (asprintf(args + argc++, "./%s", *remote_argv++) < 0)
 498                                         out_of_memory("do_cmd");
 499                         } else
 500                                 args[argc++] = *remote_argv++;
 501                         remote_argc--;
 502                 }
 503         }
 504
 505         args[argc] = NULL;
 506
 507         if (DEBUG_GTE(CMD, 2)) {
 508                 for (i = 0; i < argc; i++)
 509                         rprintf(FCLIENT, "cmd[%d]=%s ", i, args[i]);
 510                 rprintf(FCLIENT, "\n");
 511         }
 512
 513         if (read_batch) {
 514                 int from_gen_pipe[2];
 515                 set_allow_inc_recurse();
 516                 if (fd_pair(from_gen_pipe) < 0) {
 517                         rsyserr(FERROR, errno, "pipe");
 518                         exit_cleanup(RERR_IPC);
 519                 }
 520                 batch_gen_fd = from_gen_pipe[0];
 521                 *f_out_p = from_gen_pipe[1];
 522                 *f_in_p = batch_fd;
 523                 pid = (pid_t)-1; /* no child pid */
 524 #ifdef ICONV_CONST
 525                 setup_iconv();
 526 #endif
 527         } else if (local_server) {
 528                 /* If the user didn't request --[no-]whole-file, force
 529                  * it on, but only if we're not batch processing. */
 530                 if (whole_file < 0 && !write_batch)
 531                         whole_file = 1;
 532                 set_allow_inc_recurse();
 533                 pid = local_child(argc, args, f_in_p, f_out_p, child_main);
 534 #ifdef ICONV_CONST
 535                 setup_iconv();
 536 #endif
 537         } else {
 538                 pid = piped_child(args, f_in_p, f_out_p);
 539 #ifdef ICONV_CONST
 540                 setup_iconv();
 541 #endif
 542                 if (protect_args && !daemon_over_rsh)
 543                         send_protected_args(*f_out_p, args);
 544         }
 545
 546         if (need_to_free)
 547                 free(need_to_free);
 548
 549         return pid;
 550
 551   oom:
 552         out_of_memory("do_cmd");
 553         return 0; /* not reached */
 554 }
 555
 556 /* The receiving side operates in one of two modes:
 557  *
 558  * 1. it receives any number of files into a destination directory,
 559  * placing them according to their names in the file-list.
 560  *
 561  * 2. it receives a single file and saves it using the name in the
 562  * destination path instead of its file-list name.  This requires a
 563  * "local name" for writing out the destination file.
 564  *
 565  * So, our task is to figure out what mode/local-name we need.
 566  * For mode 1, we change into the destination directory and return NULL.
 567  * For mode 2, we change into the directory containing the destination
 568  * file (if we aren't already there) and return the local-name. */
 569 static char *get_local_name(struct file_list *flist, char *dest_path)
 570 {
 571         STRUCT_STAT st;
 572         int statret;
 573         char *cp;
 574
 575         if (DEBUG_GTE(RECV, 1)) {
 576                 rprintf(FINFO, "get_local_name count=%d %s\n",
 577                         file_total, NS(dest_path));
 578         }
 579
 580         if (!dest_path || list_only)
 581                 return NULL;
 582
 583         /* Treat an empty string as a copy into the current directory. */
 584         if (!*dest_path)
 585             dest_path = ".";
 586
 587         if (daemon_filter_list.head) {
 588                 char *slash = strrchr(dest_path, '/');
 589                 if (slash && (slash[1] == '\0' || (slash[1] == '.' && slash[2] == '\0')))
 590                         *slash = '\0';
 591                 else
 592                         slash = NULL;
 593                 if ((*dest_path != '.' || dest_path[1] != '\0')
 594                  && (check_filter(&daemon_filter_list, FLOG, dest_path, 0) < 0
 595                   || check_filter(&daemon_filter_list, FLOG, dest_path, 1) < 0)) {
 596                         rprintf(FERROR, "skipping daemon-excluded destination \"%s\"\n",
 597                                 dest_path);
 598                         exit_cleanup(RERR_FILESELECT);
 599                 }
 600                 if (slash)
 601                         *slash = '/';
 602         }
 603
 604         /* See what currently exists at the destination. */
 605         if ((statret = do_stat(dest_path, &st)) == 0) {
 606                 /* If the destination is a dir, enter it and use mode 1. */
 607                 if (S_ISDIR(st.st_mode)) {
 608                         if (!change_dir(dest_path, CD_NORMAL)) {
 609                                 rsyserr(FERROR, errno, "change_dir#1 %s failed",
 610                                         full_fname(dest_path));
 611                                 exit_cleanup(RERR_FILESELECT);
 612                         }
 613                         return NULL;
 614                 }
 615                 if (file_total > 1) {
 616                         rprintf(FERROR,
 617                                 "ERROR: destination must be a directory when"
 618                                 " copying more than 1 file\n");
 619                         exit_cleanup(RERR_FILESELECT);
 620                 }
 621                 if (file_total == 1 && S_ISDIR(flist->files[0]->mode)) {
 622                         rprintf(FERROR,
 623                                 "ERROR: cannot overwrite non-directory"
 624                                 " with a directory\n");
 625                         exit_cleanup(RERR_FILESELECT);
 626                 }
 627         } else if (errno != ENOENT) {
 628                 /* If we don't know what's at the destination, fail. */
 629                 rsyserr(FERROR, errno, "ERROR: cannot stat destination %s",
 630                         full_fname(dest_path));
 631                 exit_cleanup(RERR_FILESELECT);
 632         }
 633
 634         cp = strrchr(dest_path, '/');
 635
 636         /* If we need a destination directory because the transfer is not
 637          * of a single non-directory or the user has requested one via a
 638          * destination path ending in a slash, create one and use mode 1. */
 639         if (file_total > 1 || (cp && !cp[1])) {
 640                 /* Lop off the final slash (if any). */
 641                 if (cp && !cp[1])
 642                         *cp = '\0';
 643
 644                 if (statret == 0) {
 645                         rprintf(FERROR,
 646                             "ERROR: destination path is not a directory\n");
 647                         exit_cleanup(RERR_SYNTAX);
 648                 }
 649
 650                 if (do_mkdir(dest_path, ACCESSPERMS) != 0) {
 651                         rsyserr(FERROR, errno, "mkdir %s failed",
 652                                 full_fname(dest_path));
 653                         exit_cleanup(RERR_FILEIO);
 654                 }
 655
 656                 if (flist->high >= flist->low
 657                  && strcmp(flist->files[flist->low]->basename, ".") == 0)
 658                         flist->files[0]->flags |= FLAG_DIR_CREATED;
 659
 660                 if (INFO_GTE(NAME, 1))
 661                         rprintf(FINFO, "created directory %s\n", dest_path);
 662
 663                 if (dry_run) {
 664                         /* Indicate that dest dir doesn't really exist. */
 665                         dry_run++;
 666                 }
 667
 668                 if (!change_dir(dest_path, dry_run > 1 ? CD_SKIP_CHDIR : CD_NORMAL)) {
 669                         rsyserr(FERROR, errno, "change_dir#2 %s failed",
 670                                 full_fname(dest_path));
 671                         exit_cleanup(RERR_FILESELECT);
 672                 }
 673
 674                 return NULL;
 675         }
 676
 677         /* Otherwise, we are writing a single file, possibly on top of an
 678          * existing non-directory.  Change to the item's parent directory
 679          * (if it has a path component), return the basename of the
 680          * destination file as the local name, and use mode 2. */
 681         if (!cp)
 682                 return dest_path;
 683
 684         if (cp == dest_path)
 685                 dest_path = "/";
 686
 687         *cp = '\0';
 688         if (!change_dir(dest_path, CD_NORMAL)) {
 689                 rsyserr(FERROR, errno, "change_dir#3 %s failed",
 690                         full_fname(dest_path));
 691                 exit_cleanup(RERR_FILESELECT);
 692         }
 693         *cp = '/';
 694
 695         return cp + 1;
 696 }
 697
 698 /* This function checks on our alternate-basis directories.  If we're in
 699  * dry-run mode and the destination dir does not yet exist, we'll try to
 700  * tweak any dest-relative paths to make them work for a dry-run (the
 701  * destination dir must be in curr_dir[] when this function is called).
 702  * We also warn about any arg that is non-existent or not a directory. */
 703 static void check_alt_basis_dirs(void)
 704 {
 705         STRUCT_STAT st;
 706         char **dir_p, *slash = strrchr(curr_dir, '/');
 707
 708         for (dir_p = basis_dir; *dir_p; dir_p++) {
 709                 if (dry_run > 1 && **dir_p != '/') {
 710                         int len = curr_dir_len + 1 + strlen(*dir_p) + 1;
 711                         char *new = new_array(char, len);
 712                         if (!new)
 713                                 out_of_memory("check_alt_basis_dirs");
 714                         if (slash && strncmp(*dir_p, "../", 3) == 0) {
 715                             /* We want to remove only one leading "../" prefix for
 716                              * the directory we couldn't create in dry-run mode:
 717                              * this ensures that any other ".." references get
 718                              * evaluated the same as they would for a live copy. */
 719                             *slash = '\0';
 720                             pathjoin(new, len, curr_dir, *dir_p + 3);
 721                             *slash = '/';
 722                         } else
 723                             pathjoin(new, len, curr_dir, *dir_p);
 724                         *dir_p = new;
 725                 }
 726                 if (do_stat(*dir_p, &st) < 0) {
 727                         rprintf(FWARNING, "%s arg does not exist: %s\n",
 728                                 dest_option, *dir_p);
 729                 } else if (!S_ISDIR(st.st_mode)) {
 730                         rprintf(FWARNING, "%s arg is not a dir: %s\n",
 731                                 dest_option, *dir_p);
 732                 }
 733         }
 734 }
 735
 736 /* This is only called by the sender. */
 737 static void read_final_goodbye(int f_in, int f_out)
 738 {
 739         int i, iflags, xlen;
 740         uchar fnamecmp_type;
 741         char xname[MAXPATHLEN];
 742
 743         shutting_down = True;
 744
 745         if (protocol_version < 29)
 746                 i = read_int(f_in);
 747         else {
 748                 i = read_ndx_and_attrs(f_in, f_out, &iflags, &fnamecmp_type, xname, &xlen);
 749                 if (protocol_version >= 31 && i == NDX_DONE) {
 750                         if (am_sender)
 751                                 write_ndx(f_out, NDX_DONE);
 752                         else {
 753                                 if (batch_gen_fd >= 0) {
 754                                         while (read_int(batch_gen_fd) != NDX_DEL_STATS) {}
 755                                         read_del_stats(batch_gen_fd);
 756                                 }
 757                                 write_int(f_out, NDX_DONE);
 758                         }
 759                         i = read_ndx_and_attrs(f_in, f_out, &iflags, &fnamecmp_type, xname, &xlen);
 760                 }
 761         }
 762
 763         if (i != NDX_DONE) {
 764                 rprintf(FERROR, "Invalid packet at end of run (%d) [%s]\n",
 765                         i, who_am_i());
 766                 exit_cleanup(RERR_PROTOCOL);
 767         }
 768 }
 769
 770 static void do_server_sender(int f_in, int f_out, int argc, char *argv[])
 771 {
 772         struct file_list *flist;
 773         char *dir = argv[0];
 774
 775         if (DEBUG_GTE(SEND, 1)) {
 776                 rprintf(FINFO, "server_sender starting pid=%ld\n",
 777                         (long)getpid());
 778         }
 779
 780         if (am_daemon && lp_write_only(module_id)) {
 781                 rprintf(FERROR, "ERROR: module is write only\n");
 782                 exit_cleanup(RERR_SYNTAX);
 783                 return;
 784         }
 785         if (am_daemon && read_only && remove_source_files) {
 786                 rprintf(FERROR,
 787                     "ERROR: --remove-%s-files cannot be used with a read-only module\n",
 788                     remove_source_files == 1 ? "source" : "sent");
 789                 exit_cleanup(RERR_SYNTAX);
 790                 return;
 791         }
 792
 793         if (!relative_paths) {
 794                 if (!change_dir(dir, CD_NORMAL)) {
 795                         rsyserr(FERROR, errno, "change_dir#3 %s failed",
 796                                 full_fname(dir));
 797                         exit_cleanup(RERR_FILESELECT);
 798                 }
 799         }
 800         argc--;
 801         argv++;
 802
 803         if (argc == 0 && (recurse || xfer_dirs || list_only)) {
 804                 argc = 1;
 805                 argv--;
 806                 argv[0] = ".";
 807         }
 808
 809         flist = send_file_list(f_out,argc,argv);
 810         if (!flist || flist->used == 0)
 811                 exit_cleanup(0);
 812
 813         io_start_buffering_in(f_in);
 814
 815         send_files(f_in, f_out);
 816         io_flush(FULL_FLUSH);
 817         handle_stats(f_out);
 818         if (protocol_version >= 24)
 819                 read_final_goodbye(f_in, f_out);
 820         io_flush(FULL_FLUSH);
 821         exit_cleanup(0);
 822 }
 823
 824
 825 static int do_recv(int f_in, int f_out, char *local_name)
 826 {
 827         int pid;
 828         int exit_code = 0;
 829         int error_pipe[2];
 830
 831         /* The receiving side mustn't obey this, or an existing symlink that
 832          * points to an identical file won't be replaced by the referent. */
 833         copy_links = copy_dirlinks = copy_unsafe_links = 0;
 834
 835 #ifdef SUPPORT_HARD_LINKS
 836         if (preserve_hard_links && !inc_recurse)
 837                 match_hard_links(first_flist);
 838 #endif
 839
 840         if (fd_pair(error_pipe) < 0) {
 841                 rsyserr(FERROR, errno, "pipe failed in do_recv");
 842                 exit_cleanup(RERR_IPC);
 843         }
 844
 845         if (backup_dir) {
 846                 int ret = make_path(backup_dir_buf, MKP_DROP_NAME); /* drops trailing slash */
 847                 if (ret < 0)
 848                         exit_cleanup(RERR_SYNTAX);
 849                 if (ret)
 850                         rprintf(FINFO, "Created backup_dir %s\n", backup_dir_buf);
 851                 else if (INFO_GTE(BACKUP, 1))
 852                         rprintf(FINFO, "backup_dir is %s\n", backup_dir_buf);
 853         }
 854
 855         io_flush(FULL_FLUSH);
 856
 857         if ((pid = do_fork()) == -1) {
 858                 rsyserr(FERROR, errno, "fork failed in do_recv");
 859                 exit_cleanup(RERR_IPC);
 860         }
 861
 862         if (pid == 0) {
 863                 am_receiver = 1;
 864                 send_msgs_to_gen = am_server;
 865
 866                 close(error_pipe[0]);
 867
 868                 /* We can't let two processes write to the socket at one time. */
 869                 io_end_multiplex_out(MPLX_SWITCHING);
 870                 if (f_in != f_out)
 871                         close(f_out);
 872                 sock_f_out = -1;
 873                 f_out = error_pipe[1];
 874
 875                 bwlimit_writemax = 0; /* receiver doesn't need to do this */
 876
 877                 if (read_batch)
 878                         io_start_buffering_in(f_in);
 879                 io_start_multiplex_out(f_out);
 880
 881                 recv_files(f_in, f_out, local_name);
 882                 io_flush(FULL_FLUSH);
 883                 handle_stats(f_in);
 884
 885                 if (output_needs_newline) {
 886                         fputc('\n', stdout);
 887                         output_needs_newline = 0;
 888                 }
 889
 890                 write_int(f_out, NDX_DONE);
 891                 send_msg(MSG_STATS, (char*)&stats.total_read, sizeof stats.total_read, 0);
 892                 io_flush(FULL_FLUSH);
 893
 894                 /* Handle any keep-alive packets from the post-processing work
 895                  * that the generator does. */
 896                 if (protocol_version >= 29) {
 897                         kluge_around_eof = -1;
 898
 899                         /* This should only get stopped via a USR2 signal. */
 900                         read_final_goodbye(f_in, f_out);
 901
 902                         rprintf(FERROR, "Invalid packet at end of run [%s]\n",
 903                                 who_am_i());
 904                         exit_cleanup(RERR_PROTOCOL);
 905                 }
 906
 907                 /* Finally, we go to sleep until our parent kills us with a
 908                  * USR2 signal.  We sleep for a short time, as on some OSes
 909                  * a signal won't interrupt a sleep! */
 910                 while (1)
 911                         msleep(20);
 912         }
 913
 914         am_generator = 1;
 915         flist_receiving_enabled = True;
 916
 917         io_end_multiplex_in(MPLX_SWITCHING);
 918         if (write_batch && !am_server)
 919                 stop_write_batch();
 920
 921         close(error_pipe[1]);
 922         if (f_in != f_out)
 923                 close(f_in);
 924         sock_f_in = -1;
 925         f_in = error_pipe[0];
 926
 927         io_start_buffering_out(f_out);
 928         io_start_multiplex_in(f_in);
 929
 930 #ifdef SUPPORT_HARD_LINKS
 931         if (preserve_hard_links && inc_recurse) {
 932                 struct file_list *flist;
 933                 for (flist = first_flist; flist; flist = flist->next)
 934                         match_hard_links(flist);
 935         }
 936 #endif
 937
 938         generate_files(f_out, local_name);
 939
 940         handle_stats(-1);
 941         io_flush(FULL_FLUSH);
 942         shutting_down = True;
 943         if (protocol_version >= 24) {
 944                 /* send a final goodbye message */
 945                 write_ndx(f_out, NDX_DONE);
 946         }
 947         io_flush(FULL_FLUSH);
 948
 949         kill(pid, SIGUSR2);
 950         wait_process_with_flush(pid, &exit_code);
 951         return exit_code;
 952 }
 953
 954 static void do_server_recv(int f_in, int f_out, int argc, char *argv[])
 955 {
 956         int exit_code;
 957         struct file_list *flist;
 958         char *local_name = NULL;
 959         int negated_levels;
 960
 961         if (filesfrom_fd >= 0 && !msgs2stderr && protocol_version < 31) {
 962                 /* We can't mix messages with files-from data on the socket,
 963                  * so temporarily turn off info/debug messages. */
 964                 negate_output_levels();
 965                 negated_levels = 1;
 966         } else
 967                 negated_levels = 0;
 968
 969         if (DEBUG_GTE(RECV, 1)) {
 970                 rprintf(FINFO, "server_recv(%d) starting pid=%ld\n",
 971                         argc, (long)getpid());
 972         }
 973
 974         if (am_daemon && read_only) {
 975                 rprintf(FERROR,"ERROR: module is read only\n");
 976                 exit_cleanup(RERR_SYNTAX);
 977                 return;
 978         }
 979
 980         if (argc > 0) {
 981                 char *dir = argv[0];
 982                 argc--;
 983                 argv++;
 984                 if (!am_daemon && !change_dir(dir, CD_NORMAL)) {
 985                         rsyserr(FERROR, errno, "change_dir#4 %s failed",
 986                                 full_fname(dir));
 987                         exit_cleanup(RERR_FILESELECT);
 988                 }
 989         }
 990
 991         if (protocol_version >= 30)
 992                 io_start_multiplex_in(f_in);
 993         else
 994                 io_start_buffering_in(f_in);
 995         recv_filter_list(f_in);
 996
 997         if (filesfrom_fd >= 0) {
 998                 /* We need to send the files-from names to the sender at the
 999                  * same time that we receive the file-list from them, so we
1000                  * need the IO routines to automatically write out the names
1001                  * onto our f_out socket as we read the file-list.  This
1002                  * avoids both deadlock and extra delays/buffers. */
1003                 start_filesfrom_forwarding(filesfrom_fd);
1004                 filesfrom_fd = -1;
1005         }
1006
1007         flist = recv_file_list(f_in);
1008         if (!flist) {
1009                 rprintf(FERROR,"server_recv: recv_file_list error\n");
1010                 exit_cleanup(RERR_FILESELECT);
1011         }
1012         if (inc_recurse && file_total == 1)
1013                 recv_additional_file_list(f_in);
1014
1015         if (negated_levels)
1016                 negate_output_levels();
1017
1018         if (argc > 0)
1019                 local_name = get_local_name(flist,argv[0]);
1020
1021         /* Now that we know what our destination directory turned out to be,
1022          * we can sanitize the --link-/copy-/compare-dest args correctly. */
1023         if (sanitize_paths) {
1024                 char **dir_p;
1025                 for (dir_p = basis_dir; *dir_p; dir_p++)
1026                         *dir_p = sanitize_path(NULL, *dir_p, NULL, curr_dir_depth, SP_DEFAULT);
1027                 if (partial_dir)
1028                         partial_dir = sanitize_path(NULL, partial_dir, NULL, curr_dir_depth, SP_DEFAULT);
1029         }
1030         check_alt_basis_dirs();
1031
1032         if (daemon_filter_list.head) {
1033                 char **dir_p;
1034                 filter_rule_list *elp = &daemon_filter_list;
1035
1036                 for (dir_p = basis_dir; *dir_p; dir_p++) {
1037                         char *dir = *dir_p;
1038                         if (*dir == '/')
1039                                 dir += module_dirlen;
1040                         if (check_filter(elp, FLOG, dir, 1) < 0)
1041                                 goto options_rejected;
1042                 }
1043                 if (partial_dir && *partial_dir == '/'
1044                  && check_filter(elp, FLOG, partial_dir + module_dirlen, 1) < 0) {
1045                     options_rejected:
1046                         rprintf(FERROR,
1047                                 "Your options have been rejected by the server.\n");
1048                         exit_cleanup(RERR_SYNTAX);
1049                 }
1050         }
1051
1052         exit_code = do_recv(f_in, f_out, local_name);
1053         exit_cleanup(exit_code);
1054 }
1055
1056
1057 int child_main(int argc, char *argv[])
1058 {
1059         start_server(STDIN_FILENO, STDOUT_FILENO, argc, argv);
1060         return 0;
1061 }
1062
1063
1064 void start_server(int f_in, int f_out, int argc, char *argv[])
1065 {
1066         set_nonblocking(f_in);
1067         set_nonblocking(f_out);
1068
1069         io_set_sock_fds(f_in, f_out);
1070         setup_protocol(f_out, f_in);
1071
1072         if (protocol_version >= 23)
1073                 io_start_multiplex_out(f_out);
1074         if (am_daemon && io_timeout && protocol_version >= 31)
1075                 send_msg_int(MSG_IO_TIMEOUT, io_timeout);
1076
1077         if (am_sender) {
1078                 keep_dirlinks = 0; /* Must be disabled on the sender. */
1079                 if (need_messages_from_generator)
1080                         io_start_multiplex_in(f_in);
1081                 else
1082                         io_start_buffering_in(f_in);
1083                 recv_filter_list(f_in);
1084                 do_server_sender(f_in, f_out, argc, argv);
1085         } else
1086                 do_server_recv(f_in, f_out, argc, argv);
1087         exit_cleanup(0);
1088 }
1089
1090 /* This is called once the connection has been negotiated.  It is used
1091  * for rsyncd, remote-shell, and local connections. */
1092 int client_run(int f_in, int f_out, pid_t pid, int argc, char *argv[])
1093 {
1094         struct file_list *flist = NULL;
1095         int exit_code = 0, exit_code2 = 0;
1096         char *local_name = NULL;
1097
1098         cleanup_child_pid = pid;
1099         if (!read_batch) {
1100                 set_nonblocking(f_in);
1101                 set_nonblocking(f_out);
1102         }
1103
1104         io_set_sock_fds(f_in, f_out);
1105         setup_protocol(f_out,f_in);
1106
1107         /* We set our stderr file handle to blocking because ssh might have
1108          * set it to non-blocking.  This can be particularly troublesome if
1109          * stderr is a clone of stdout, because ssh would have set our stdout
1110          * to non-blocking at the same time (which can easily cause us to lose
1111          * output from our print statements).  This kluge shouldn't cause ssh
1112          * any problems for how we use it.  Note also that we delayed setting
1113          * this until after the above protocol setup so that we know for sure
1114          * that ssh is done twiddling its file descriptors.  */
1115         set_blocking(STDERR_FILENO);
1116
1117         if (am_sender) {
1118                 keep_dirlinks = 0; /* Must be disabled on the sender. */
1119
1120                 if (always_checksum
1121                  && (log_format_has(stdout_format, 'C')
1122                   || log_format_has(logfile_format, 'C')))
1123                         sender_keeps_checksum = 1;
1124
1125                 if (protocol_version >= 30)
1126                         io_start_multiplex_out(f_out);
1127                 else
1128                         io_start_buffering_out(f_out);
1129                 if (protocol_version >= 31 || (!filesfrom_host && protocol_version >= 23))
1130                         io_start_multiplex_in(f_in);
1131                 else
1132                         io_start_buffering_in(f_in);
1133                 send_filter_list(f_out);
1134                 if (filesfrom_host)
1135                         filesfrom_fd = f_in;
1136
1137                 if (write_batch && !am_server)
1138                         start_write_batch(f_out);
1139                 flist = send_file_list(f_out, argc, argv);
1140                 if (DEBUG_GTE(FLIST, 3))
1141                         rprintf(FINFO,"file list sent\n");
1142
1143                 if (protocol_version < 31 && filesfrom_host && protocol_version >= 23)
1144                         io_start_multiplex_in(f_in);
1145
1146                 io_flush(NORMAL_FLUSH);
1147                 send_files(f_in, f_out);
1148                 io_flush(FULL_FLUSH);
1149                 handle_stats(-1);
1150                 if (protocol_version >= 24)
1151                         read_final_goodbye(f_in, f_out);
1152                 if (pid != -1) {
1153                         if (DEBUG_GTE(EXIT, 2))
1154                                 rprintf(FINFO,"client_run waiting on %d\n", (int) pid);
1155                         io_flush(FULL_FLUSH);
1156                         wait_process_with_flush(pid, &exit_code);
1157                 }
1158                 output_summary();
1159                 io_flush(FULL_FLUSH);
1160                 exit_cleanup(exit_code);
1161         }
1162
1163         if (!read_batch) {
1164                 if (protocol_version >= 23)
1165                         io_start_multiplex_in(f_in);
1166                 if (need_messages_from_generator)
1167                         io_start_multiplex_out(f_out);
1168                 else
1169                         io_start_buffering_out(f_out);
1170         }
1171
1172         send_filter_list(read_batch ? -1 : f_out);
1173
1174         if (filesfrom_fd >= 0) {
1175                 start_filesfrom_forwarding(filesfrom_fd);
1176                 filesfrom_fd = -1;
1177         }
1178
1179         if (write_batch && !am_server)
1180                 start_write_batch(f_in);
1181         flist = recv_file_list(f_in);
1182         if (inc_recurse && file_total == 1)
1183                 recv_additional_file_list(f_in);
1184
1185         if (flist && flist->used > 0) {
1186                 local_name = get_local_name(flist, argv[0]);
1187
1188                 check_alt_basis_dirs();
1189
1190                 exit_code2 = do_recv(f_in, f_out, local_name);
1191         } else {
1192                 handle_stats(-1);
1193                 output_summary();
1194         }
1195
1196         if (pid != -1) {
1197                 if (DEBUG_GTE(RECV, 1))
1198                         rprintf(FINFO,"client_run2 waiting on %d\n", (int) pid);
1199                 io_flush(FULL_FLUSH);
1200                 wait_process_with_flush(pid, &exit_code);
1201         }
1202
1203         return MAX(exit_code, exit_code2);
1204 }
1205
1206 static int copy_argv(char *argv[])
1207 {
1208         int i;
1209
1210         for (i = 0; argv[i]; i++) {
1211                 if (!(argv[i] = strdup(argv[i]))) {
1212                         rprintf (FERROR, "out of memory at %s(%d)\n",
1213                                  __FILE__, __LINE__);
1214                         return RERR_MALLOC;
1215                 }
1216         }
1217
1218         return 0;
1219 }
1220
1221
1222 /* Start a client for either type of remote connection.  Work out
1223  * whether the arguments request a remote shell or rsyncd connection,
1224  * and call the appropriate connection function, then run_client.
1225  *
1226  * Calls either start_socket_client (for sockets) or do_cmd and
1227  * client_run (for ssh). */
1228 static int start_client(int argc, char *argv[])
1229 {
1230         char *p, *shell_machine = NULL, *shell_user = NULL;
1231         char **remote_argv;
1232         int remote_argc;
1233         int f_in, f_out;
1234         int ret;
1235         pid_t pid;
1236
1237         /* Don't clobber argv[] so that ps(1) can still show the right
1238          * command line. */
1239         if ((ret = copy_argv(argv)) != 0)
1240                 return ret;
1241
1242         if (!read_batch) { /* for read_batch, NO source is specified */
1243                 char *path = check_for_hostspec(argv[0], &shell_machine, &rsync_port);
1244                 if (path) { /* source is remote */
1245                         char *dummy_host;
1246                         int dummy_port = 0;
1247                         *argv = path;
1248                         remote_argv = argv;
1249                         remote_argc = argc;
1250                         argv += argc - 1;
1251                         if (argc == 1 || **argv == ':')
1252                                 argc = 0; /* no dest arg */
1253                         else if (check_for_hostspec(*argv, &dummy_host, &dummy_port)) {
1254                                 rprintf(FERROR,
1255                                         "The source and destination cannot both be remote.\n");
1256                                 exit_cleanup(RERR_SYNTAX);
1257                         } else {
1258                                 remote_argc--; /* don't count dest */
1259                                 argc = 1;
1260                         }
1261                         if (filesfrom_host && *filesfrom_host
1262                             && strcmp(filesfrom_host, shell_machine) != 0) {
1263                                 rprintf(FERROR,
1264                                         "--files-from hostname is not the same as the transfer hostname\n");
1265                                 exit_cleanup(RERR_SYNTAX);
1266                         }
1267                         am_sender = 0;
1268                         if (rsync_port)
1269                                 daemon_over_rsh = shell_cmd ? 1 : -1;
1270                 } else { /* source is local, check dest arg */
1271                         am_sender = 1;
1272
1273                         if (argc > 1) {
1274                                 p = argv[--argc];
1275                                 remote_argv = argv + argc;
1276                         } else {
1277                                 static char *dotarg[1] = { "." };
1278                                 p = dotarg[0];
1279                                 remote_argv = dotarg;
1280                         }
1281                         remote_argc = 1;
1282
1283                         path = check_for_hostspec(p, &shell_machine, &rsync_port);
1284                         if (path && filesfrom_host && *filesfrom_host
1285                             && strcmp(filesfrom_host, shell_machine) != 0) {
1286                                 rprintf(FERROR,
1287                                         "--files-from hostname is not the same as the transfer hostname\n");
1288                                 exit_cleanup(RERR_SYNTAX);
1289                         }
1290                         if (!path) { /* no hostspec found, so src & dest are local */
1291                                 local_server = 1;
1292                                 if (filesfrom_host) {
1293                                         rprintf(FERROR,
1294                                                 "--files-from cannot be remote when the transfer is local\n");
1295                                         exit_cleanup(RERR_SYNTAX);
1296                                 }
1297                                 shell_machine = NULL;
1298                         } else { /* hostspec was found, so dest is remote */
1299                                 argv[argc] = path;
1300                                 if (rsync_port)
1301                                         daemon_over_rsh = shell_cmd ? 1 : -1;
1302                         }
1303                 }
1304         } else {  /* read_batch */
1305                 local_server = 1;
1306                 if (check_for_hostspec(argv[argc-1], &shell_machine, &rsync_port)) {
1307                         rprintf(FERROR, "remote destination is not allowed with --read-batch\n");
1308                         exit_cleanup(RERR_SYNTAX);
1309                 }
1310                 remote_argv = argv += argc - 1;
1311                 remote_argc = argc = 1;
1312         }
1313
1314         if (am_sender) {
1315                 char *dummy_host;
1316                 int dummy_port = rsync_port;
1317                 int i;
1318                 /* For local source, extra source args must not have hostspec. */
1319                 for (i = 1; i < argc; i++) {
1320                         if (check_for_hostspec(argv[i], &dummy_host, &dummy_port)) {
1321                                 rprintf(FERROR, "Unexpected remote arg: %s\n", argv[i]);
1322                                 exit_cleanup(RERR_SYNTAX);
1323                         }
1324                 }
1325         } else {
1326                 char *dummy_host;
1327                 int dummy_port = rsync_port;
1328                 int i;
1329                 /* For remote source, any extra source args must have either
1330                  * the same hostname or an empty hostname. */
1331                 for (i = 1; i < remote_argc; i++) {
1332                         char *arg = check_for_hostspec(remote_argv[i], &dummy_host, &dummy_port);
1333                         if (!arg) {
1334                                 rprintf(FERROR, "Unexpected local arg: %s\n", remote_argv[i]);
1335                                 rprintf(FERROR, "If arg is a remote file/dir, prefix it with a colon (:).\n");
1336                                 exit_cleanup(RERR_SYNTAX);
1337                         }
1338                         if (*dummy_host && strcmp(dummy_host, shell_machine) != 0) {
1339                                 rprintf(FERROR, "All source args must come from the same machine.\n");
1340                                 exit_cleanup(RERR_SYNTAX);
1341                         }
1342                         if (rsync_port != dummy_port) {
1343                                 if (!rsync_port || !dummy_port)
1344                                         rprintf(FERROR, "All source args must use the same hostspec format.\n");
1345                                 else
1346                                         rprintf(FERROR, "All source args must use the same port number.\n");
1347                                 exit_cleanup(RERR_SYNTAX);
1348                         }
1349                         remote_argv[i] = arg;
1350                 }
1351         }
1352
1353         if (daemon_over_rsh < 0)
1354                 return start_socket_client(shell_machine, remote_argc, remote_argv, argc, argv);
1355
1356         if (password_file && !daemon_over_rsh) {
1357                 rprintf(FERROR, "The --password-file option may only be "
1358                                 "used when accessing an rsync daemon.\n");
1359                 exit_cleanup(RERR_SYNTAX);
1360         }
1361
1362         if (connect_timeout) {
1363                 rprintf(FERROR, "The --contimeout option may only be "
1364                                 "used when connecting to an rsync daemon.\n");
1365                 exit_cleanup(RERR_SYNTAX);
1366         }
1367
1368         if (shell_machine) {
1369                 p = strrchr(shell_machine,'@');
1370                 if (p) {
1371                         *p = 0;
1372                         shell_user = shell_machine;
1373                         shell_machine = p+1;
1374                 }
1375         }
1376
1377         if (DEBUG_GTE(CMD, 2)) {
1378                 rprintf(FINFO,"cmd=%s machine=%s user=%s path=%s\n",
1379                         NS(shell_cmd), NS(shell_machine), NS(shell_user),
1380                         NS(remote_argv[0]));
1381         }
1382
1383         pid = do_cmd(shell_cmd, shell_machine, shell_user, remote_argv, remote_argc,
1384                      &f_in, &f_out);
1385
1386         /* if we're running an rsync server on the remote host over a
1387          * remote shell command, we need to do the RSYNCD protocol first */
1388         if (daemon_over_rsh) {
1389                 int tmpret;
1390                 tmpret = start_inband_exchange(f_in, f_out, shell_user, remote_argc, remote_argv);
1391                 if (tmpret < 0)
1392                         return tmpret;
1393         }
1394
1395         ret = client_run(f_in, f_out, pid, argc, argv);
1396
1397         fflush(stdout);
1398         fflush(stderr);
1399
1400         return ret;
1401 }
1402
1403
1404 static RETSIGTYPE sigusr1_handler(UNUSED(int val))
1405 {
1406         exit_cleanup(RERR_SIGNAL1);
1407 }
1408
1409 static RETSIGTYPE sigusr2_handler(UNUSED(int val))
1410 {
1411         if (!am_server)
1412                 output_summary();
1413         close_all();
1414         if (got_xfer_error)
1415                 _exit(RERR_PARTIAL);
1416         _exit(0);
1417 }
1418
1419 RETSIGTYPE remember_children(UNUSED(int val))
1420 {
1421 #ifdef WNOHANG
1422         int cnt, status;
1423         pid_t pid;
1424         /* An empty waitpid() loop was put here by Tridge and we could never
1425          * get him to explain why he put it in, so rather than taking it
1426          * out we're instead saving the child exit statuses for later use.
1427          * The waitpid() loop presumably eliminates all possibility of leaving
1428          * zombie children, maybe that's why he did it. */
1429         while ((pid = waitpid(-1, &status, WNOHANG)) > 0) {
1430                 /* save the child's exit status */
1431                 for (cnt = 0; cnt < MAXCHILDPROCS; cnt++) {
1432                         if (pid_stat_table[cnt].pid == 0) {
1433                                 pid_stat_table[cnt].pid = pid;
1434                                 pid_stat_table[cnt].status = status;
1435                                 break;
1436                         }
1437                 }
1438         }
1439 #endif
1440 #ifndef HAVE_SIGACTION
1441         signal(SIGCHLD, remember_children);
1442 #endif
1443 }
1444
1445
1446 /**
1447  * This routine catches signals and tries to send them to gdb.
1448  *
1449  * Because it's called from inside a signal handler it ought not to
1450  * use too many library routines.
1451  *
1452  * @todo Perhaps use "screen -X" instead/as well, to help people
1453  * debugging without easy access to X.  Perhaps use an environment
1454  * variable, or just call a script?
1455  *
1456  * @todo The /proc/ magic probably only works on Linux (and
1457  * Solaris?)  Can we be more portable?
1458  **/
1459 #ifdef MAINTAINER_MODE
1460 const char *get_panic_action(void)
1461 {
1462         const char *cmd_fmt = getenv("RSYNC_PANIC_ACTION");
1463
1464         if (cmd_fmt)
1465                 return cmd_fmt;
1466         else
1467                 return "xterm -display :0 -T Panic -n Panic "
1468                         "-e gdb /proc/%d/exe %d";
1469 }
1470
1471
1472 /**
1473  * Handle a fatal signal by launching a debugger, controlled by $RSYNC_PANIC_ACTION.
1474  *
1475  * This signal handler is only installed if we were configured with
1476  * --enable-maintainer-mode.  Perhaps it should always be on and we
1477  * should just look at the environment variable, but I'm a bit leery
1478  * of a signal sending us into a busy loop.
1479  **/
1480 static RETSIGTYPE rsync_panic_handler(UNUSED(int whatsig))
1481 {
1482         char cmd_buf[300];
1483         int ret;
1484
1485         snprintf(cmd_buf, sizeof cmd_buf, get_panic_action(),
1486                  getpid(), getpid());
1487
1488         /* Unless we failed to execute gdb, we allow the process to
1489          * continue.  I'm not sure if that's right. */
1490         ret = system(cmd_buf);
1491         if (ret)
1492                 _exit(ret);
1493 }
1494 #endif
1495
1496
1497 int main(int argc,char *argv[])
1498 {
1499         int ret;
1500         int orig_argc = argc;
1501         char **orig_argv = argv;
1502 #ifdef HAVE_SIGACTION
1503 # ifdef HAVE_SIGPROCMASK
1504         sigset_t sigmask;
1505
1506         sigemptyset(&sigmask);
1507 # endif
1508         sigact.sa_flags = SA_NOCLDSTOP;
1509 #endif
1510         SIGACTMASK(SIGUSR1, sigusr1_handler);
1511         SIGACTMASK(SIGUSR2, sigusr2_handler);
1512         SIGACTMASK(SIGCHLD, remember_children);
1513 #ifdef MAINTAINER_MODE
1514         SIGACTMASK(SIGSEGV, rsync_panic_handler);
1515         SIGACTMASK(SIGFPE, rsync_panic_handler);
1516         SIGACTMASK(SIGABRT, rsync_panic_handler);
1517         SIGACTMASK(SIGBUS, rsync_panic_handler);
1518 #endif
1519
1520         starttime = time(NULL);
1521         our_uid = MY_UID();
1522         our_gid = MY_GID();
1523         am_root = our_uid == 0;
1524
1525         memset(&stats, 0, sizeof(stats));
1526
1527         if (argc < 2) {
1528                 usage(FERROR);
1529                 exit_cleanup(RERR_SYNTAX);
1530         }
1531
1532         /* Get the umask for use in permission calculations.  We no longer set
1533          * it to zero; that is ugly and pointless now that all the callers that
1534          * relied on it have been reeducated to work with default ACLs. */
1535         umask(orig_umask = umask(0));
1536
1537 #if defined CONFIG_LOCALE && defined HAVE_SETLOCALE
1538         setlocale(LC_CTYPE, "");
1539 #endif
1540
1541         if (!parse_arguments(&argc, (const char ***) &argv)) {
1542                 /* FIXME: We ought to call the same error-handling
1543                  * code here, rather than relying on getopt. */
1544                 option_error();
1545                 exit_cleanup(RERR_SYNTAX);
1546         }
1547
1548         SIGACTMASK(SIGINT, sig_int);
1549         SIGACTMASK(SIGHUP, sig_int);
1550         SIGACTMASK(SIGTERM, sig_int);
1551 #if defined HAVE_SIGACTION && HAVE_SIGPROCMASK
1552         sigprocmask(SIG_UNBLOCK, &sigmask, NULL);
1553 #endif
1554
1555         /* Ignore SIGPIPE; we consistently check error codes and will
1556          * see the EPIPE. */
1557         SIGACTION(SIGPIPE, SIG_IGN);
1558 #ifdef SIGXFSZ
1559         SIGACTION(SIGXFSZ, SIG_IGN);
1560 #endif
1561
1562         /* Initialize change_dir() here because on some old systems getcwd
1563          * (implemented by forking "pwd" and reading its output) doesn't
1564          * work when there are other child processes.  Also, on all systems
1565          * that implement getcwd that way "pwd" can't be found after chroot. */
1566         change_dir(NULL, CD_NORMAL);
1567
1568         init_flist();
1569
1570         if ((write_batch || read_batch) && !am_server) {
1571                 if (write_batch)
1572                         write_batch_shell_file(orig_argc, orig_argv, argc);
1573
1574                 if (read_batch && strcmp(batch_name, "-") == 0)
1575                         batch_fd = STDIN_FILENO;
1576                 else {
1577                         batch_fd = do_open(batch_name,
1578                                    write_batch ? O_WRONLY | O_CREAT | O_TRUNC
1579                                    : O_RDONLY, S_IRUSR | S_IWUSR);
1580                 }
1581                 if (batch_fd < 0) {
1582                         rsyserr(FERROR, errno, "Batch file %s open error",
1583                                 full_fname(batch_name));
1584                         exit_cleanup(RERR_FILEIO);
1585                 }
1586                 if (read_batch)
1587                         read_stream_flags(batch_fd);
1588                 else
1589                         write_stream_flags(batch_fd);
1590         }
1591         if (write_batch < 0)
1592                 dry_run = 1;
1593
1594         if (am_server) {
1595 #ifdef ICONV_CONST
1596                 setup_iconv();
1597 #endif
1598         } else if (am_daemon)
1599                 return daemon_main();
1600
1601         if (am_server && protect_args) {
1602                 char buf[MAXPATHLEN];
1603                 protect_args = 2;
1604                 read_args(STDIN_FILENO, NULL, buf, sizeof buf, 1, &argv, &argc, NULL);
1605                 if (!parse_arguments(&argc, (const char ***) &argv)) {
1606                         option_error();
1607                         exit_cleanup(RERR_SYNTAX);
1608                 }
1609         }
1610
1611         if (argc < 1) {
1612                 usage(FERROR);
1613                 exit_cleanup(RERR_SYNTAX);
1614         }
1615
1616         if (am_server) {
1617                 set_nonblocking(STDIN_FILENO);
1618                 set_nonblocking(STDOUT_FILENO);
1619                 if (am_daemon)
1620                         return start_daemon(STDIN_FILENO, STDOUT_FILENO);
1621                 start_server(STDIN_FILENO, STDOUT_FILENO, argc, argv);
1622         }
1623
1624         ret = start_client(argc, argv);
1625         if (ret == -1)
1626                 exit_cleanup(RERR_STARTCLIENT);
1627         else
1628                 exit_cleanup(ret);
1629
1630         return ret;
1631 }