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) 2003-2020 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 #include <popt.h>
  30
  31 extern int dry_run;
  32 extern int list_only;
  33 extern int io_timeout;
  34 extern int am_root;
  35 extern int am_server;
  36 extern int am_sender;
  37 extern int am_daemon;
  38 extern int inc_recurse;
  39 extern int blocking_io;
  40 extern int always_checksum;
  41 extern int remove_source_files;
  42 extern int output_needs_newline;
  43 extern int called_from_signal_handler;
  44 extern int need_messages_from_generator;
  45 extern int kluge_around_eof;
  46 extern int got_xfer_error;
  47 extern int msgs2stderr;
  48 extern int module_id;
  49 extern int read_only;
  50 extern int copy_links;
  51 extern int copy_dirlinks;
  52 extern int copy_unsafe_links;
  53 extern int keep_dirlinks;
  54 extern int preserve_hard_links;
  55 extern int protocol_version;
  56 extern int file_total;
  57 extern int recurse;
  58 extern int xfer_dirs;
  59 extern int protect_args;
  60 extern int relative_paths;
  61 extern int sanitize_paths;
  62 extern int curr_dir_depth;
  63 extern int curr_dir_len;
  64 extern int module_id;
  65 extern int rsync_port;
  66 extern int whole_file;
  67 extern int read_batch;
  68 extern int write_batch;
  69 extern int batch_fd;
  70 extern int sock_f_in;
  71 extern int sock_f_out;
  72 extern int filesfrom_fd;
  73 extern int connect_timeout;
  74 extern int send_msgs_to_gen;
  75 extern dev_t filesystem_dev;
  76 extern pid_t cleanup_child_pid;
  77 extern size_t bwlimit_writemax;
  78 extern unsigned int module_dirlen;
  79 extern BOOL flist_receiving_enabled;
  80 extern BOOL want_progress_now;
  81 extern BOOL shutting_down;
  82 extern int backup_dir_len;
  83 extern int basis_dir_cnt;
  84 extern int default_af_hint;
  85 extern struct stats stats;
  86 extern char *stdout_format;
  87 extern char *logfile_format;
  88 extern char *filesfrom_host;
  89 extern char *partial_dir;
  90 extern char *rsync_path;
  91 extern char *shell_cmd;
  92 extern char *password_file;
  93 extern char *backup_dir;
  94 extern char *copy_as;
  95 extern char curr_dir[MAXPATHLEN];
  96 extern char backup_dir_buf[MAXPATHLEN];
  97 extern char *basis_dir[MAX_BASIS_DIRS+1];
  98 extern struct file_list *first_flist;
  99 extern filter_rule_list daemon_filter_list;
 100
 101 uid_t our_uid;
 102 gid_t our_gid;
 103 int am_receiver = 0;  /* Only set to 1 after the receiver/generator fork. */
 104 int am_generator = 0; /* Only set to 1 after the receiver/generator fork. */
 105 int local_server = 0;
 106 int daemon_over_rsh = 0;
 107 mode_t orig_umask = 0;
 108 int batch_gen_fd = -1;
 109 int sender_keeps_checksum = 0;
 110 int raw_argc, cooked_argc;
 111 char **raw_argv, **cooked_argv;
 112
 113 /* There's probably never more than at most 2 outstanding child processes,
 114  * but set it higher, just in case. */
 115 #define MAXCHILDPROCS 7
 116
 117 #ifdef HAVE_SIGACTION
 118 # ifdef HAVE_SIGPROCMASK
 119 #  define SIGACTMASK(n,h) SIGACTION(n,h), sigaddset(&sigmask,(n))
 120 # else
 121 #  define SIGACTMASK(n,h) SIGACTION(n,h)
 122 # endif
 123 static struct sigaction sigact;
 124 #endif
 125
 126 struct pid_status {
 127         pid_t pid;
 128         int status;
 129 } pid_stat_table[MAXCHILDPROCS];
 130
 131 static time_t starttime, endtime;
 132 static int64 total_read, total_written;
 133
 134 static void show_malloc_stats(void);
 135
 136 /* Works like waitpid(), but if we already harvested the child pid in our
 137  * remember_children(), we succeed instead of returning an error. */
 138 pid_t wait_process(pid_t pid, int *status_ptr, int flags)
 139 {
 140         pid_t waited_pid;
 141
 142         do {
 143                 waited_pid = waitpid(pid, status_ptr, flags);
 144         } while (waited_pid == -1 && errno == EINTR);
 145
 146         if (waited_pid == -1 && errno == ECHILD) {
 147                 /* Status of requested child no longer available:  check to
 148                  * see if it was processed by remember_children(). */
 149                 int cnt;
 150                 for (cnt = 0; cnt < MAXCHILDPROCS; cnt++) {
 151                         if (pid == pid_stat_table[cnt].pid) {
 152                                 *status_ptr = pid_stat_table[cnt].status;
 153                                 pid_stat_table[cnt].pid = 0;
 154                                 return pid;
 155                         }
 156                 }
 157         }
 158
 159         return waited_pid;
 160 }
 161
 162 int shell_exec(const char *cmd)
 163 {
 164         char *shell = getenv("RSYNC_SHELL");
 165         int status;
 166         pid_t pid;
 167
 168         if (!shell)
 169                 return system(cmd);
 170
 171         if ((pid = fork()) < 0)
 172                 return -1;
 173
 174         if (pid == 0) {
 175                 execlp(shell, shell, "-c", cmd, NULL);
 176                 _exit(1);
 177         }
 178
 179         int ret = wait_process(pid, &status, 0);
 180         return ret < 0 ? -1 : status;
 181 }
 182
 183 /* Wait for a process to exit, calling io_flush while waiting. */
 184 static void wait_process_with_flush(pid_t pid, int *exit_code_ptr)
 185 {
 186         pid_t waited_pid;
 187         int status;
 188
 189         while ((waited_pid = wait_process(pid, &status, WNOHANG)) == 0) {
 190                 msleep(20);
 191                 io_flush(FULL_FLUSH);
 192         }
 193
 194         /* TODO: If the child exited on a signal, then log an
 195          * appropriate error message.  Perhaps we should also accept a
 196          * message describing the purpose of the child.  Also indicate
 197          * this to the caller so that they know something went wrong. */
 198         if (waited_pid < 0) {
 199                 rsyserr(FERROR, errno, "waitpid");
 200                 *exit_code_ptr = RERR_WAITCHILD;
 201         } else if (!WIFEXITED(status)) {
 202 #ifdef WCOREDUMP
 203                 if (WCOREDUMP(status))
 204                         *exit_code_ptr = RERR_CRASHED;
 205                 else
 206 #endif
 207                 if (WIFSIGNALED(status))
 208                         *exit_code_ptr = RERR_TERMINATED;
 209                 else
 210                         *exit_code_ptr = RERR_WAITCHILD;
 211         } else
 212                 *exit_code_ptr = WEXITSTATUS(status);
 213 }
 214
 215 void write_del_stats(int f)
 216 {
 217         if (read_batch)
 218                 write_int(f, NDX_DEL_STATS);
 219         else
 220                 write_ndx(f, NDX_DEL_STATS);
 221         write_varint(f, stats.deleted_files - stats.deleted_dirs
 222                       - stats.deleted_symlinks - stats.deleted_devices
 223                       - stats.deleted_specials);
 224         write_varint(f, stats.deleted_dirs);
 225         write_varint(f, stats.deleted_symlinks);
 226         write_varint(f, stats.deleted_devices);
 227         write_varint(f, stats.deleted_specials);
 228 }
 229
 230 void read_del_stats(int f)
 231 {
 232         stats.deleted_files = read_varint(f);
 233         stats.deleted_files += stats.deleted_dirs = read_varint(f);
 234         stats.deleted_files += stats.deleted_symlinks = read_varint(f);
 235         stats.deleted_files += stats.deleted_devices = read_varint(f);
 236         stats.deleted_files += stats.deleted_specials = read_varint(f);
 237 }
 238
 239 static void become_copy_as_user()
 240 {
 241         char *gname;
 242         uid_t uid;
 243         gid_t gid;
 244
 245         if (!copy_as)
 246                 return;
 247
 248         if (DEBUG_GTE(CMD, 2))
 249                 rprintf(FINFO, "[%s] copy_as=%s\n", who_am_i(), copy_as);
 250
 251         if ((gname = strchr(copy_as, ':')) != NULL)
 252                 *gname++ = '\0';
 253
 254         if (!user_to_uid(copy_as, &uid, True)) {
 255                 rprintf(FERROR, "Invalid copy-as user: %s\n", copy_as);
 256                 exit_cleanup(RERR_SYNTAX);
 257         }
 258
 259         if (gname) {
 260                 if (!group_to_gid(gname, &gid, True)) {
 261                         rprintf(FERROR, "Invalid copy-as group: %s\n", gname);
 262                         exit_cleanup(RERR_SYNTAX);
 263                 }
 264         } else {
 265                 struct passwd *pw;
 266                 if ((pw = getpwuid(uid)) == NULL) {
 267                         rsyserr(FERROR, errno, "getpwuid failed");
 268                         exit_cleanup(RERR_SYNTAX);
 269                 }
 270                 gid = pw->pw_gid;
 271         }
 272
 273         if (setgid(gid) < 0) {
 274                 rsyserr(FERROR, errno, "setgid failed");
 275                 exit_cleanup(RERR_SYNTAX);
 276         }
 277 #ifdef HAVE_SETGROUPS
 278         if (setgroups(1, &gid)) {
 279                 rsyserr(FERROR, errno, "setgroups failed");
 280                 exit_cleanup(RERR_SYNTAX);
 281         }
 282 #endif
 283 #ifdef HAVE_INITGROUPS
 284         if (!gname && initgroups(copy_as, gid) < 0) {
 285                 rsyserr(FERROR, errno, "initgroups failed");
 286                 exit_cleanup(RERR_SYNTAX);
 287         }
 288 #endif
 289
 290         if (setuid(uid) < 0
 291 #ifdef HAVE_SETEUID
 292          || seteuid(uid) < 0
 293 #endif
 294         ) {
 295                 rsyserr(FERROR, errno, "setuid failed");
 296                 exit_cleanup(RERR_SYNTAX);
 297         }
 298
 299         our_uid = MY_UID();
 300         our_gid = MY_GID();
 301         am_root = (our_uid == 0);
 302
 303         if (gname)
 304                 gname[-1] = ':';
 305 }
 306
 307 /* This function gets called from all 3 processes.  We want the client side
 308  * to actually output the text, but the sender is the only process that has
 309  * all the stats we need.  So, if we're a client sender, we do the report.
 310  * If we're a server sender, we write the stats on the supplied fd.  If
 311  * we're the client receiver we read the stats from the supplied fd and do
 312  * the report.  All processes might also generate a set of debug stats, if
 313  * the verbose level is high enough (this is the only thing that the
 314  * generator process and the server receiver ever do here). */
 315 static void handle_stats(int f)
 316 {
 317         endtime = time(NULL);
 318
 319         /* Cache two stats because the read/write code can change it. */
 320         total_read = stats.total_read;
 321         total_written = stats.total_written;
 322
 323         if (INFO_GTE(STATS, 3)) {
 324                 /* These come out from every process */
 325                 show_malloc_stats();
 326                 show_flist_stats();
 327         }
 328
 329         if (am_generator)
 330                 return;
 331
 332         if (am_daemon) {
 333                 if (f == -1 || !am_sender)
 334                         return;
 335         }
 336
 337         if (am_server) {
 338                 if (am_sender) {
 339                         write_varlong30(f, total_read, 3);
 340                         write_varlong30(f, total_written, 3);
 341                         write_varlong30(f, stats.total_size, 3);
 342                         if (protocol_version >= 29) {
 343                                 write_varlong30(f, stats.flist_buildtime, 3);
 344                                 write_varlong30(f, stats.flist_xfertime, 3);
 345                         }
 346                 }
 347                 return;
 348         }
 349
 350         /* this is the client */
 351
 352         if (f < 0 && !am_sender) /* e.g. when we got an empty file list. */
 353                 ;
 354         else if (!am_sender) {
 355                 /* Read the first two in opposite order because the meaning of
 356                  * read/write swaps when switching from sender to receiver. */
 357                 total_written = read_varlong30(f, 3);
 358                 total_read = read_varlong30(f, 3);
 359                 stats.total_size = read_varlong30(f, 3);
 360                 if (protocol_version >= 29) {
 361                         stats.flist_buildtime = read_varlong30(f, 3);
 362                         stats.flist_xfertime = read_varlong30(f, 3);
 363                 }
 364         } else if (write_batch) {
 365                 /* The --read-batch process is going to be a client
 366                  * receiver, so we need to give it the stats. */
 367                 write_varlong30(batch_fd, total_read, 3);
 368                 write_varlong30(batch_fd, total_written, 3);
 369                 write_varlong30(batch_fd, stats.total_size, 3);
 370                 if (protocol_version >= 29) {
 371                         write_varlong30(batch_fd, stats.flist_buildtime, 3);
 372                         write_varlong30(batch_fd, stats.flist_xfertime, 3);
 373                 }
 374         }
 375 }
 376
 377 static void output_itemized_counts(const char *prefix, int *counts)
 378 {
 379         static char *labels[] = { "reg", "dir", "link", "dev", "special" };
 380         char buf[1024], *pre = " (";
 381         int j, len = 0;
 382         int total = counts[0];
 383         if (total) {
 384                 counts[0] -= counts[1] + counts[2] + counts[3] + counts[4];
 385                 for (j = 0; j < 5; j++) {
 386                         if (counts[j]) {
 387                                 len += snprintf(buf+len, sizeof buf - len - 2,
 388                                         "%s%s: %s",
 389                                         pre, labels[j], comma_num(counts[j]));
 390                                 pre = ", ";
 391                         }
 392                 }
 393                 buf[len++] = ')';
 394         }
 395         buf[len] = '\0';
 396         rprintf(FINFO, "%s: %s%s\n", prefix, comma_num(total), buf);
 397 }
 398
 399 static const char *bytes_per_sec_human_dnum(void)
 400 {
 401         if (starttime == (time_t)-1 || endtime == (time_t)-1)
 402                 return "UNKNOWN";
 403         return human_dnum((total_written + total_read) / (0.5 + (endtime - starttime)), 2);
 404 }
 405
 406 static void output_summary(void)
 407 {
 408         if (INFO_GTE(STATS, 2)) {
 409                 rprintf(FCLIENT, "\n");
 410                 output_itemized_counts("Number of files", &stats.num_files);
 411                 if (protocol_version >= 29)
 412                         output_itemized_counts("Number of created files", &stats.created_files);
 413                 if (protocol_version >= 31)
 414                         output_itemized_counts("Number of deleted files", &stats.deleted_files);
 415                 rprintf(FINFO,"Number of regular files transferred: %s\n",
 416                         comma_num(stats.xferred_files));
 417                 rprintf(FINFO,"Total file size: %s bytes\n",
 418                         human_num(stats.total_size));
 419                 rprintf(FINFO,"Total transferred file size: %s bytes\n",
 420                         human_num(stats.total_transferred_size));
 421                 rprintf(FINFO,"Literal data: %s bytes\n",
 422                         human_num(stats.literal_data));
 423                 rprintf(FINFO,"Matched data: %s bytes\n",
 424                         human_num(stats.matched_data));
 425                 rprintf(FINFO,"File list size: %s\n",
 426                         human_num(stats.flist_size));
 427                 if (stats.flist_buildtime) {
 428                         rprintf(FINFO,
 429                                 "File list generation time: %s seconds\n",
 430                                 comma_dnum((double)stats.flist_buildtime / 1000, 3));
 431                         rprintf(FINFO,
 432                                 "File list transfer time: %s seconds\n",
 433                                 comma_dnum((double)stats.flist_xfertime / 1000, 3));
 434                 }
 435                 rprintf(FINFO,"Total bytes sent: %s\n",
 436                         human_num(total_written));
 437                 rprintf(FINFO,"Total bytes received: %s\n",
 438                         human_num(total_read));
 439         }
 440
 441         if (INFO_GTE(STATS, 1)) {
 442                 rprintf(FCLIENT, "\n");
 443                 rprintf(FINFO,
 444                         "sent %s bytes  received %s bytes  %s bytes/sec\n",
 445                         human_num(total_written), human_num(total_read),
 446                         bytes_per_sec_human_dnum());
 447                 rprintf(FINFO, "total size is %s  speedup is %s%s\n",
 448                         human_num(stats.total_size),
 449                         comma_dnum((double)stats.total_size / (total_written+total_read), 2),
 450                         write_batch < 0 ? " (BATCH ONLY)" : dry_run ? " (DRY RUN)" : "");
 451         }
 452
 453         fflush(stdout);
 454         fflush(stderr);
 455 }
 456
 457
 458 /**
 459  * If our C library can get malloc statistics, then show them to FINFO
 460  **/
 461 static void show_malloc_stats(void)
 462 {
 463 #ifdef HAVE_MALLINFO
 464         struct mallinfo mi;
 465
 466         mi = mallinfo();
 467
 468         rprintf(FCLIENT, "\n");
 469         rprintf(FINFO, RSYNC_NAME "[%d] (%s%s%s) heap statistics:\n",
 470                 (int)getpid(), am_server ? "server " : "",
 471                 am_daemon ? "daemon " : "", who_am_i());
 472         rprintf(FINFO, "  arena:     %10ld   (bytes from sbrk)\n",
 473                 (long)mi.arena);
 474         rprintf(FINFO, "  ordblks:   %10ld   (chunks not in use)\n",
 475                 (long)mi.ordblks);
 476         rprintf(FINFO, "  smblks:    %10ld\n",
 477                 (long)mi.smblks);
 478         rprintf(FINFO, "  hblks:     %10ld   (chunks from mmap)\n",
 479                 (long)mi.hblks);
 480         rprintf(FINFO, "  hblkhd:    %10ld   (bytes from mmap)\n",
 481                 (long)mi.hblkhd);
 482         rprintf(FINFO, "  allmem:    %10ld   (bytes from sbrk + mmap)\n",
 483                 (long)mi.arena + mi.hblkhd);
 484         rprintf(FINFO, "  usmblks:   %10ld\n",
 485                 (long)mi.usmblks);
 486         rprintf(FINFO, "  fsmblks:   %10ld\n",
 487                 (long)mi.fsmblks);
 488         rprintf(FINFO, "  uordblks:  %10ld   (bytes used)\n",
 489                 (long)mi.uordblks);
 490         rprintf(FINFO, "  fordblks:  %10ld   (bytes free)\n",
 491                 (long)mi.fordblks);
 492         rprintf(FINFO, "  keepcost:  %10ld   (bytes in releasable chunk)\n",
 493                 (long)mi.keepcost);
 494 #endif /* HAVE_MALLINFO */
 495 }
 496
 497
 498 /* Start the remote shell.   cmd may be NULL to use the default. */
 499 static pid_t do_cmd(char *cmd, char *machine, char *user, char **remote_argv, int remote_argc,
 500                     int *f_in_p, int *f_out_p)
 501 {
 502         int i, argc = 0;
 503         char *args[MAX_ARGS], *need_to_free = NULL;
 504         pid_t pid;
 505         int dash_l_set = 0;
 506
 507         if (!read_batch && !local_server) {
 508                 char *t, *f, in_quote = '\0';
 509                 char *rsh_env = getenv(RSYNC_RSH_ENV);
 510                 if (!cmd)
 511                         cmd = rsh_env;
 512                 if (!cmd)
 513                         cmd = RSYNC_RSH;
 514                 cmd = need_to_free = strdup(cmd);
 515                 if (!cmd)
 516                         goto oom;
 517
 518                 for (t = f = cmd; *f; f++) {
 519                         if (*f == ' ')
 520                                 continue;
 521                         /* Comparison leaves rooms for server_options(). */
 522                         if (argc >= MAX_ARGS - MAX_SERVER_ARGS)
 523                                 goto arg_overflow;
 524                         args[argc++] = t;
 525                         while (*f != ' ' || in_quote) {
 526                                 if (!*f) {
 527                                         if (in_quote) {
 528                                                 rprintf(FERROR,
 529                                                         "Missing trailing-%c in remote-shell command.\n",
 530                                                         in_quote);
 531                                                 exit_cleanup(RERR_SYNTAX);
 532                                         }
 533                                         f--;
 534                                         break;
 535                                 }
 536                                 if (*f == '\'' || *f == '"') {
 537                                         if (!in_quote) {
 538                                                 in_quote = *f++;
 539                                                 continue;
 540                                         }
 541                                         if (*f == in_quote && *++f != in_quote) {
 542                                                 in_quote = '\0';
 543                                                 continue;
 544                                         }
 545                                 }
 546                                 *t++ = *f++;
 547                         }
 548                         *t++ = '\0';
 549                 }
 550
 551                 /* NOTE: must preserve t == start of command name until the end of the args handling! */
 552                 if ((t = strrchr(cmd, '/')) != NULL)
 553                         t++;
 554                 else
 555                         t = cmd;
 556
 557                 /* Check to see if we've already been given '-l user' in the remote-shell command. */
 558                 for (i = 0; i < argc-1; i++) {
 559                         if (!strcmp(args[i], "-l") && args[i+1][0] != '-')
 560                                 dash_l_set = 1;
 561                 }
 562
 563 #ifdef HAVE_REMSH
 564                 /* remsh (on HPUX) takes the arguments the other way around */
 565                 args[argc++] = machine;
 566                 if (user && !(daemon_over_rsh && dash_l_set)) {
 567                         args[argc++] = "-l";
 568                         args[argc++] = user;
 569                 }
 570 #else
 571                 if (user && !(daemon_over_rsh && dash_l_set)) {
 572                         args[argc++] = "-l";
 573                         args[argc++] = user;
 574                 }
 575 #ifdef AF_INET
 576                 if (default_af_hint == AF_INET && strcmp(t, "ssh") == 0)
 577                         args[argc++] = "-4"; /* we're using ssh so we can add a -4 option */
 578 #endif
 579 #ifdef AF_INET6
 580                 if (default_af_hint == AF_INET6 && strcmp(t, "ssh") == 0)
 581                         args[argc++] = "-6"; /* we're using ssh so we can add a -6 option */
 582 #endif
 583                 args[argc++] = machine;
 584 #endif
 585
 586                 args[argc++] = rsync_path;
 587
 588                 if (blocking_io < 0 && (strcmp(t, "rsh") == 0 || strcmp(t, "remsh") == 0))
 589                         blocking_io = 1;
 590
 591                 server_options(args, &argc);
 592
 593                 if (argc >= MAX_ARGS - 2)
 594                         goto arg_overflow;
 595         }
 596
 597         args[argc++] = ".";
 598
 599         if (!daemon_over_rsh) {
 600                 while (remote_argc > 0) {
 601                         if (argc >= MAX_ARGS - 1) {
 602                           arg_overflow:
 603                                 rprintf(FERROR, "internal: args[] overflowed in do_cmd()\n");
 604                                 exit_cleanup(RERR_SYNTAX);
 605                         }
 606                         if (**remote_argv == '-') {
 607                                 if (asprintf(args + argc++, "./%s", *remote_argv++) < 0)
 608                                         out_of_memory("do_cmd");
 609                         } else
 610                                 args[argc++] = *remote_argv++;
 611                         remote_argc--;
 612                 }
 613         }
 614
 615         args[argc] = NULL;
 616
 617         if (DEBUG_GTE(CMD, 2)) {
 618                 for (i = 0; i < argc; i++)
 619                         rprintf(FCLIENT, "cmd[%d]=%s ", i, args[i]);
 620                 rprintf(FCLIENT, "\n");
 621         }
 622
 623         if (read_batch) {
 624                 int from_gen_pipe[2];
 625                 set_allow_inc_recurse();
 626                 if (fd_pair(from_gen_pipe) < 0) {
 627                         rsyserr(FERROR, errno, "pipe");
 628                         exit_cleanup(RERR_IPC);
 629                 }
 630                 batch_gen_fd = from_gen_pipe[0];
 631                 *f_out_p = from_gen_pipe[1];
 632                 *f_in_p = batch_fd;
 633                 pid = (pid_t)-1; /* no child pid */
 634 #ifdef ICONV_CONST
 635                 setup_iconv();
 636 #endif
 637         } else if (local_server) {
 638                 /* If the user didn't request --[no-]whole-file, force
 639                  * it on, but only if we're not batch processing. */
 640                 if (whole_file < 0 && !write_batch)
 641                         whole_file = 1;
 642                 set_allow_inc_recurse();
 643                 pid = local_child(argc, args, f_in_p, f_out_p, child_main);
 644 #ifdef ICONV_CONST
 645                 setup_iconv();
 646 #endif
 647         } else {
 648                 pid = piped_child(args, f_in_p, f_out_p);
 649 #ifdef ICONV_CONST
 650                 setup_iconv();
 651 #endif
 652                 if (protect_args && !daemon_over_rsh)
 653                         send_protected_args(*f_out_p, args);
 654         }
 655
 656         if (need_to_free)
 657                 free(need_to_free);
 658
 659         return pid;
 660
 661   oom:
 662         out_of_memory("do_cmd");
 663         return 0; /* not reached */
 664 }
 665
 666 /* The receiving side operates in one of two modes:
 667  *
 668  * 1. it receives any number of files into a destination directory,
 669  * placing them according to their names in the file-list.
 670  *
 671  * 2. it receives a single file and saves it using the name in the
 672  * destination path instead of its file-list name.  This requires a
 673  * "local name" for writing out the destination file.
 674  *
 675  * So, our task is to figure out what mode/local-name we need.
 676  * For mode 1, we change into the destination directory and return NULL.
 677  * For mode 2, we change into the directory containing the destination
 678  * file (if we aren't already there) and return the local-name. */
 679 static char *get_local_name(struct file_list *flist, char *dest_path)
 680 {
 681         STRUCT_STAT st;
 682         int statret;
 683         char *cp;
 684
 685         if (DEBUG_GTE(RECV, 1)) {
 686                 rprintf(FINFO, "get_local_name count=%d %s\n",
 687                         file_total, NS(dest_path));
 688         }
 689
 690         if (!dest_path || list_only)
 691                 return NULL;
 692
 693         /* Treat an empty string as a copy into the current directory. */
 694         if (!*dest_path)
 695                 dest_path = ".";
 696
 697         if (daemon_filter_list.head) {
 698                 char *slash = strrchr(dest_path, '/');
 699                 if (slash && (slash[1] == '\0' || (slash[1] == '.' && slash[2] == '\0')))
 700                         *slash = '\0';
 701                 else
 702                         slash = NULL;
 703                 if ((*dest_path != '.' || dest_path[1] != '\0')
 704                  && (check_filter(&daemon_filter_list, FLOG, dest_path, 0) < 0
 705                   || check_filter(&daemon_filter_list, FLOG, dest_path, 1) < 0)) {
 706                         rprintf(FERROR, "ERROR: daemon has excluded destination \"%s\"\n",
 707                                 dest_path);
 708                         exit_cleanup(RERR_FILESELECT);
 709                 }
 710                 if (slash)
 711                         *slash = '/';
 712         }
 713
 714         /* See what currently exists at the destination. */
 715         if ((statret = do_stat(dest_path, &st)) == 0) {
 716                 /* If the destination is a dir, enter it and use mode 1. */
 717                 if (S_ISDIR(st.st_mode)) {
 718                         if (!change_dir(dest_path, CD_NORMAL)) {
 719                                 rsyserr(FERROR, errno, "change_dir#1 %s failed",
 720                                         full_fname(dest_path));
 721                                 exit_cleanup(RERR_FILESELECT);
 722                         }
 723                         filesystem_dev = st.st_dev; /* ensures --force works right w/-x */
 724                         return NULL;
 725                 }
 726                 if (file_total > 1) {
 727                         rprintf(FERROR,
 728                                 "ERROR: destination must be a directory when"
 729                                 " copying more than 1 file\n");
 730                         exit_cleanup(RERR_FILESELECT);
 731                 }
 732                 if (file_total == 1 && S_ISDIR(flist->files[0]->mode)) {
 733                         rprintf(FERROR,
 734                                 "ERROR: cannot overwrite non-directory"
 735                                 " with a directory\n");
 736                         exit_cleanup(RERR_FILESELECT);
 737                 }
 738         } else if (errno != ENOENT) {
 739                 /* If we don't know what's at the destination, fail. */
 740                 rsyserr(FERROR, errno, "ERROR: cannot stat destination %s",
 741                         full_fname(dest_path));
 742                 exit_cleanup(RERR_FILESELECT);
 743         }
 744
 745         cp = strrchr(dest_path, '/');
 746
 747         /* If we need a destination directory because the transfer is not
 748          * of a single non-directory or the user has requested one via a
 749          * destination path ending in a slash, create one and use mode 1. */
 750         if (file_total > 1 || (cp && !cp[1])) {
 751                 /* Lop off the final slash (if any). */
 752                 if (cp && !cp[1])
 753                         *cp = '\0';
 754
 755                 if (statret == 0) {
 756                         rprintf(FERROR, "ERROR: destination path is not a directory\n");
 757                         exit_cleanup(RERR_SYNTAX);
 758                 }
 759
 760                 if (do_mkdir(dest_path, ACCESSPERMS) != 0) {
 761                         rsyserr(FERROR, errno, "mkdir %s failed",
 762                                 full_fname(dest_path));
 763                         exit_cleanup(RERR_FILEIO);
 764                 }
 765
 766                 if (flist->high >= flist->low
 767                  && strcmp(flist->files[flist->low]->basename, ".") == 0)
 768                         flist->files[0]->flags |= FLAG_DIR_CREATED;
 769
 770                 if (INFO_GTE(NAME, 1))
 771                         rprintf(FINFO, "created directory %s\n", dest_path);
 772
 773                 if (dry_run) {
 774                         /* Indicate that dest dir doesn't really exist. */
 775                         dry_run++;
 776                 }
 777
 778                 if (!change_dir(dest_path, dry_run > 1 ? CD_SKIP_CHDIR : CD_NORMAL)) {
 779                         rsyserr(FERROR, errno, "change_dir#2 %s failed",
 780                                 full_fname(dest_path));
 781                         exit_cleanup(RERR_FILESELECT);
 782                 }
 783
 784                 return NULL;
 785         }
 786
 787         /* Otherwise, we are writing a single file, possibly on top of an
 788          * existing non-directory.  Change to the item's parent directory
 789          * (if it has a path component), return the basename of the
 790          * destination file as the local name, and use mode 2. */
 791         if (!cp)
 792                 return dest_path;
 793
 794         if (cp == dest_path)
 795                 dest_path = "/";
 796
 797         *cp = '\0';
 798         if (!change_dir(dest_path, CD_NORMAL)) {
 799                 rsyserr(FERROR, errno, "change_dir#3 %s failed",
 800                         full_fname(dest_path));
 801                 exit_cleanup(RERR_FILESELECT);
 802         }
 803         *cp = '/';
 804
 805         return cp + 1;
 806 }
 807
 808 /* This function checks on our alternate-basis directories.  If we're in
 809  * dry-run mode and the destination dir does not yet exist, we'll try to
 810  * tweak any dest-relative paths to make them work for a dry-run (the
 811  * destination dir must be in curr_dir[] when this function is called).
 812  * We also warn about any arg that is non-existent or not a directory. */
 813 static void check_alt_basis_dirs(void)
 814 {
 815         STRUCT_STAT st;
 816         char *slash = strrchr(curr_dir, '/');
 817         int j;
 818
 819         for (j = 0; j < basis_dir_cnt; j++) {
 820                 char *bdir = basis_dir[j];
 821                 int bd_len = strlen(bdir);
 822                 if (bd_len > 1 && bdir[bd_len-1] == '/')
 823                         bdir[--bd_len] = '\0';
 824                 if (dry_run > 1 && *bdir != '/') {
 825                         int len = curr_dir_len + 1 + bd_len + 1;
 826                         char *new = new_array(char, len);
 827                         if (!new)
 828                                 out_of_memory("check_alt_basis_dirs");
 829                         if (slash && strncmp(bdir, "../", 3) == 0) {
 830                                 /* We want to remove only one leading "../" prefix for
 831                                  * the directory we couldn't create in dry-run mode:
 832                                  * this ensures that any other ".." references get
 833                                  * evaluated the same as they would for a live copy. */
 834                                 *slash = '\0';
 835                                 pathjoin(new, len, curr_dir, bdir + 3);
 836                                 *slash = '/';
 837                         } else
 838                                 pathjoin(new, len, curr_dir, bdir);
 839                         basis_dir[j] = bdir = new;
 840                 }
 841                 if (do_stat(bdir, &st) < 0)
 842                         rprintf(FWARNING, "%s arg does not exist: %s\n", alt_dest_opt(0), bdir);
 843                 else if (!S_ISDIR(st.st_mode))
 844                         rprintf(FWARNING, "%s arg is not a dir: %s\n", alt_dest_opt(0), bdir);
 845         }
 846 }
 847
 848 /* This is only called by the sender. */
 849 static void read_final_goodbye(int f_in, int f_out)
 850 {
 851         int i, iflags, xlen;
 852         uchar fnamecmp_type;
 853         char xname[MAXPATHLEN];
 854
 855         shutting_down = True;
 856
 857         if (protocol_version < 29)
 858                 i = read_int(f_in);
 859         else {
 860                 i = read_ndx_and_attrs(f_in, f_out, &iflags, &fnamecmp_type, xname, &xlen);
 861                 if (protocol_version >= 31 && i == NDX_DONE) {
 862                         if (am_sender)
 863                                 write_ndx(f_out, NDX_DONE);
 864                         else {
 865                                 if (batch_gen_fd >= 0) {
 866                                         while (read_int(batch_gen_fd) != NDX_DEL_STATS) {}
 867                                         read_del_stats(batch_gen_fd);
 868                                 }
 869                                 write_int(f_out, NDX_DONE);
 870                         }
 871                         i = read_ndx_and_attrs(f_in, f_out, &iflags, &fnamecmp_type, xname, &xlen);
 872                 }
 873         }
 874
 875         if (i != NDX_DONE) {
 876                 rprintf(FERROR, "Invalid packet at end of run (%d) [%s]\n",
 877                         i, who_am_i());
 878                 exit_cleanup(RERR_PROTOCOL);
 879         }
 880 }
 881
 882 static void do_server_sender(int f_in, int f_out, int argc, char *argv[])
 883 {
 884         struct file_list *flist;
 885         char *dir;
 886
 887         if (DEBUG_GTE(SEND, 1))
 888                 rprintf(FINFO, "server_sender starting pid=%d\n", (int)getpid());
 889
 890         if (am_daemon && lp_write_only(module_id)) {
 891                 rprintf(FERROR, "ERROR: module is write only\n");
 892                 exit_cleanup(RERR_SYNTAX);
 893         }
 894         if (am_daemon && read_only && remove_source_files) {
 895                 rprintf(FERROR,
 896                         "ERROR: --remove-%s-files cannot be used with a read-only module\n",
 897                         remove_source_files == 1 ? "source" : "sent");
 898                 exit_cleanup(RERR_SYNTAX);
 899         }
 900         if (argc < 1) {
 901                 rprintf(FERROR, "ERROR: do_server_sender called without args\n");
 902                 exit_cleanup(RERR_SYNTAX);
 903         }
 904
 905         become_copy_as_user();
 906
 907         dir = argv[0];
 908         if (!relative_paths) {
 909                 if (!change_dir(dir, CD_NORMAL)) {
 910                         rsyserr(FERROR, errno, "change_dir#3 %s failed",
 911                                 full_fname(dir));
 912                         exit_cleanup(RERR_FILESELECT);
 913                 }
 914         }
 915         argc--;
 916         argv++;
 917
 918         if (argc == 0 && (recurse || xfer_dirs || list_only)) {
 919                 argc = 1;
 920                 argv--;
 921                 argv[0] = ".";
 922         }
 923
 924         flist = send_file_list(f_out,argc,argv);
 925         if (!flist || flist->used == 0) {
 926                 /* Make sure input buffering is off so we can't hang in noop_io_until_death(). */
 927                 io_end_buffering_in(0);
 928                 /* TODO:  we should really exit in a more controlled manner. */
 929                 exit_cleanup(0);
 930         }
 931
 932         io_start_buffering_in(f_in);
 933
 934         send_files(f_in, f_out);
 935         io_flush(FULL_FLUSH);
 936         handle_stats(f_out);
 937         if (protocol_version >= 24)
 938                 read_final_goodbye(f_in, f_out);
 939         io_flush(FULL_FLUSH);
 940         exit_cleanup(0);
 941 }
 942
 943
 944 static int do_recv(int f_in, int f_out, char *local_name)
 945 {
 946         int pid;
 947         int exit_code = 0;
 948         int error_pipe[2];
 949
 950         /* The receiving side mustn't obey this, or an existing symlink that
 951          * points to an identical file won't be replaced by the referent. */
 952         copy_links = copy_dirlinks = copy_unsafe_links = 0;
 953
 954 #ifdef SUPPORT_HARD_LINKS
 955         if (preserve_hard_links && !inc_recurse)
 956                 match_hard_links(first_flist);
 957 #endif
 958
 959         if (fd_pair(error_pipe) < 0) {
 960                 rsyserr(FERROR, errno, "pipe failed in do_recv");
 961                 exit_cleanup(RERR_IPC);
 962         }
 963
 964         if (backup_dir) {
 965                 STRUCT_STAT st;
 966                 int ret;
 967                 if (backup_dir_len > 1)
 968                         backup_dir_buf[backup_dir_len-1] = '\0';
 969                 ret = do_stat(backup_dir_buf, &st);
 970                 if (ret != 0 || !S_ISDIR(st.st_mode)) {
 971                         if (ret == 0) {
 972                                 rprintf(FERROR, "The backup-dir is not a directory: %s\n", backup_dir_buf);
 973                                 exit_cleanup(RERR_SYNTAX);
 974                         }
 975                         if (errno != ENOENT) {
 976                                 rprintf(FERROR, "Failed to stat %s: %s\n", backup_dir_buf, strerror(errno));
 977                                 exit_cleanup(RERR_FILEIO);
 978                         }
 979                         if (INFO_GTE(BACKUP, 1))
 980                                 rprintf(FINFO, "(new) backup_dir is %s\n", backup_dir_buf);
 981                 } else if (INFO_GTE(BACKUP, 1))
 982                         rprintf(FINFO, "backup_dir is %s\n", backup_dir_buf);
 983                 if (backup_dir_len > 1)
 984                         backup_dir_buf[backup_dir_len-1] = '/';
 985         }
 986
 987         io_flush(FULL_FLUSH);
 988
 989         if ((pid = do_fork()) == -1) {
 990                 rsyserr(FERROR, errno, "fork failed in do_recv");
 991                 exit_cleanup(RERR_IPC);
 992         }
 993
 994         if (pid == 0) {
 995                 am_receiver = 1;
 996                 send_msgs_to_gen = am_server;
 997
 998                 close(error_pipe[0]);
 999
1000                 /* We can't let two processes write to the socket at one time. */
1001                 io_end_multiplex_out(MPLX_SWITCHING);
1002                 if (f_in != f_out)
1003                         close(f_out);
1004                 sock_f_out = -1;
1005                 f_out = error_pipe[1];
1006
1007                 bwlimit_writemax = 0; /* receiver doesn't need to do this */
1008
1009                 if (read_batch)
1010                         io_start_buffering_in(f_in);
1011                 io_start_multiplex_out(f_out);
1012
1013                 recv_files(f_in, f_out, local_name);
1014                 io_flush(FULL_FLUSH);
1015                 handle_stats(f_in);
1016
1017                 if (output_needs_newline) {
1018                         fputc('\n', stdout);
1019                         output_needs_newline = 0;
1020                 }
1021
1022                 write_int(f_out, NDX_DONE);
1023                 send_msg(MSG_STATS, (char*)&stats.total_read, sizeof stats.total_read, 0);
1024                 io_flush(FULL_FLUSH);
1025
1026                 /* Handle any keep-alive packets from the post-processing work
1027                  * that the generator does. */
1028                 if (protocol_version >= 29) {
1029                         kluge_around_eof = -1;
1030
1031                         /* This should only get stopped via a USR2 signal. */
1032                         read_final_goodbye(f_in, f_out);
1033
1034                         rprintf(FERROR, "Invalid packet at end of run [%s]\n",
1035                                 who_am_i());
1036                         exit_cleanup(RERR_PROTOCOL);
1037                 }
1038
1039                 /* Finally, we go to sleep until our parent kills us with a
1040                  * USR2 signal.  We sleep for a short time, as on some OSes
1041                  * a signal won't interrupt a sleep! */
1042                 while (1)
1043                         msleep(20);
1044         }
1045
1046         am_generator = 1;
1047         flist_receiving_enabled = True;
1048
1049         io_end_multiplex_in(MPLX_SWITCHING);
1050         if (write_batch && !am_server)
1051                 stop_write_batch();
1052
1053         close(error_pipe[1]);
1054         if (f_in != f_out)
1055                 close(f_in);
1056         sock_f_in = -1;
1057         f_in = error_pipe[0];
1058
1059         io_start_buffering_out(f_out);
1060         io_start_multiplex_in(f_in);
1061
1062 #ifdef SUPPORT_HARD_LINKS
1063         if (preserve_hard_links && inc_recurse) {
1064                 struct file_list *flist;
1065                 for (flist = first_flist; flist; flist = flist->next)
1066                         match_hard_links(flist);
1067         }
1068 #endif
1069
1070         generate_files(f_out, local_name);
1071
1072         handle_stats(-1);
1073         io_flush(FULL_FLUSH);
1074         shutting_down = True;
1075         if (protocol_version >= 24) {
1076                 /* send a final goodbye message */
1077                 write_ndx(f_out, NDX_DONE);
1078         }
1079         io_flush(FULL_FLUSH);
1080
1081         kill(pid, SIGUSR2);
1082         wait_process_with_flush(pid, &exit_code);
1083         return exit_code;
1084 }
1085
1086 static void do_server_recv(int f_in, int f_out, int argc, char *argv[])
1087 {
1088         int exit_code;
1089         struct file_list *flist;
1090         char *local_name = NULL;
1091         int negated_levels;
1092
1093         if (filesfrom_fd >= 0 && !msgs2stderr && protocol_version < 31) {
1094                 /* We can't mix messages with files-from data on the socket,
1095                  * so temporarily turn off info/debug messages. */
1096                 negate_output_levels();
1097                 negated_levels = 1;
1098         } else
1099                 negated_levels = 0;
1100
1101         if (DEBUG_GTE(RECV, 1))
1102                 rprintf(FINFO, "server_recv(%d) starting pid=%d\n", argc, (int)getpid());
1103
1104         if (am_daemon && read_only) {
1105                 rprintf(FERROR,"ERROR: module is read only\n");
1106                 exit_cleanup(RERR_SYNTAX);
1107                 return;
1108         }
1109
1110         become_copy_as_user();
1111
1112         if (argc > 0) {
1113                 char *dir = argv[0];
1114                 argc--;
1115                 argv++;
1116                 if (!am_daemon && !change_dir(dir, CD_NORMAL)) {
1117                         rsyserr(FERROR, errno, "change_dir#4 %s failed",
1118                                 full_fname(dir));
1119                         exit_cleanup(RERR_FILESELECT);
1120                 }
1121         }
1122
1123         if (protocol_version >= 30)
1124                 io_start_multiplex_in(f_in);
1125         else
1126                 io_start_buffering_in(f_in);
1127         recv_filter_list(f_in);
1128
1129         if (filesfrom_fd >= 0) {
1130                 /* We need to send the files-from names to the sender at the
1131                  * same time that we receive the file-list from them, so we
1132                  * need the IO routines to automatically write out the names
1133                  * onto our f_out socket as we read the file-list.  This
1134                  * avoids both deadlock and extra delays/buffers. */
1135                 start_filesfrom_forwarding(filesfrom_fd);
1136                 filesfrom_fd = -1;
1137         }
1138
1139         flist = recv_file_list(f_in, -1);
1140         if (!flist) {
1141                 rprintf(FERROR,"server_recv: recv_file_list error\n");
1142                 exit_cleanup(RERR_FILESELECT);
1143         }
1144         if (inc_recurse && file_total == 1)
1145                 recv_additional_file_list(f_in);
1146
1147         if (negated_levels)
1148                 negate_output_levels();
1149
1150         if (argc > 0)
1151                 local_name = get_local_name(flist,argv[0]);
1152
1153         /* Now that we know what our destination directory turned out to be,
1154          * we can sanitize the --link-/copy-/compare-dest args correctly. */
1155         if (sanitize_paths) {
1156                 char **dir_p;
1157                 for (dir_p = basis_dir; *dir_p; dir_p++)
1158                         *dir_p = sanitize_path(NULL, *dir_p, NULL, curr_dir_depth, SP_DEFAULT);
1159                 if (partial_dir)
1160                         partial_dir = sanitize_path(NULL, partial_dir, NULL, curr_dir_depth, SP_DEFAULT);
1161         }
1162         check_alt_basis_dirs();
1163
1164         if (daemon_filter_list.head) {
1165                 char **dir_p;
1166                 filter_rule_list *elp = &daemon_filter_list;
1167
1168                 for (dir_p = basis_dir; *dir_p; dir_p++) {
1169                         char *dir = *dir_p;
1170                         if (*dir == '/')
1171                                 dir += module_dirlen;
1172                         if (check_filter(elp, FLOG, dir, 1) < 0)
1173                                 goto options_rejected;
1174                 }
1175                 if (partial_dir && *partial_dir == '/'
1176                  && check_filter(elp, FLOG, partial_dir + module_dirlen, 1) < 0) {
1177                     options_rejected:
1178                         rprintf(FERROR, "Your options have been rejected by the server.\n");
1179                         exit_cleanup(RERR_SYNTAX);
1180                 }
1181         }
1182
1183         exit_code = do_recv(f_in, f_out, local_name);
1184         exit_cleanup(exit_code);
1185 }
1186
1187
1188 int child_main(int argc, char *argv[])
1189 {
1190         start_server(STDIN_FILENO, STDOUT_FILENO, argc, argv);
1191         return 0;
1192 }
1193
1194
1195 void start_server(int f_in, int f_out, int argc, char *argv[])
1196 {
1197         set_nonblocking(f_in);
1198         set_nonblocking(f_out);
1199
1200         io_set_sock_fds(f_in, f_out);
1201         setup_protocol(f_out, f_in);
1202
1203         if (protocol_version >= 23)
1204                 io_start_multiplex_out(f_out);
1205         if (am_daemon && io_timeout && protocol_version >= 31)
1206                 send_msg_int(MSG_IO_TIMEOUT, io_timeout);
1207
1208         if (am_sender) {
1209                 keep_dirlinks = 0; /* Must be disabled on the sender. */
1210                 if (need_messages_from_generator)
1211                         io_start_multiplex_in(f_in);
1212                 else
1213                         io_start_buffering_in(f_in);
1214                 recv_filter_list(f_in);
1215                 do_server_sender(f_in, f_out, argc, argv);
1216         } else
1217                 do_server_recv(f_in, f_out, argc, argv);
1218         exit_cleanup(0);
1219 }
1220
1221 /* This is called once the connection has been negotiated.  It is used
1222  * for rsyncd, remote-shell, and local connections. */
1223 int client_run(int f_in, int f_out, pid_t pid, int argc, char *argv[])
1224 {
1225         struct file_list *flist = NULL;
1226         int exit_code = 0, exit_code2 = 0;
1227         char *local_name = NULL;
1228
1229         cleanup_child_pid = pid;
1230         if (!read_batch) {
1231                 set_nonblocking(f_in);
1232                 set_nonblocking(f_out);
1233         }
1234
1235         io_set_sock_fds(f_in, f_out);
1236         setup_protocol(f_out,f_in);
1237
1238         /* We set our stderr file handle to blocking because ssh might have
1239          * set it to non-blocking.  This can be particularly troublesome if
1240          * stderr is a clone of stdout, because ssh would have set our stdout
1241          * to non-blocking at the same time (which can easily cause us to lose
1242          * output from our print statements).  This kluge shouldn't cause ssh
1243          * any problems for how we use it.  Note also that we delayed setting
1244          * this until after the above protocol setup so that we know for sure
1245          * that ssh is done twiddling its file descriptors.  */
1246         set_blocking(STDERR_FILENO);
1247
1248         if (am_sender) {
1249                 keep_dirlinks = 0; /* Must be disabled on the sender. */
1250
1251                 if (always_checksum
1252                  && (log_format_has(stdout_format, 'C')
1253                   || log_format_has(logfile_format, 'C')))
1254                         sender_keeps_checksum = 1;
1255
1256                 if (protocol_version >= 30)
1257                         io_start_multiplex_out(f_out);
1258                 else
1259                         io_start_buffering_out(f_out);
1260                 if (protocol_version >= 31 || (!filesfrom_host && protocol_version >= 23))
1261                         io_start_multiplex_in(f_in);
1262                 else
1263                         io_start_buffering_in(f_in);
1264                 send_filter_list(f_out);
1265                 if (filesfrom_host)
1266                         filesfrom_fd = f_in;
1267
1268                 if (write_batch && !am_server)
1269                         start_write_batch(f_out);
1270
1271                 become_copy_as_user();
1272
1273                 flist = send_file_list(f_out, argc, argv);
1274                 if (DEBUG_GTE(FLIST, 3))
1275                         rprintf(FINFO,"file list sent\n");
1276
1277                 if (protocol_version < 31 && filesfrom_host && protocol_version >= 23)
1278                         io_start_multiplex_in(f_in);
1279
1280                 io_flush(NORMAL_FLUSH);
1281                 send_files(f_in, f_out);
1282                 io_flush(FULL_FLUSH);
1283                 handle_stats(-1);
1284                 if (protocol_version >= 24)
1285                         read_final_goodbye(f_in, f_out);
1286                 if (pid != -1) {
1287                         if (DEBUG_GTE(EXIT, 2))
1288                                 rprintf(FINFO,"client_run waiting on %d\n", (int) pid);
1289                         io_flush(FULL_FLUSH);
1290                         wait_process_with_flush(pid, &exit_code);
1291                 }
1292                 output_summary();
1293                 io_flush(FULL_FLUSH);
1294                 exit_cleanup(exit_code);
1295         }
1296
1297         if (!read_batch) {
1298                 if (protocol_version >= 23)
1299                         io_start_multiplex_in(f_in);
1300                 if (need_messages_from_generator)
1301                         io_start_multiplex_out(f_out);
1302                 else
1303                         io_start_buffering_out(f_out);
1304         }
1305
1306         become_copy_as_user();
1307
1308         send_filter_list(read_batch ? -1 : f_out);
1309
1310         if (filesfrom_fd >= 0) {
1311                 start_filesfrom_forwarding(filesfrom_fd);
1312                 filesfrom_fd = -1;
1313         }
1314
1315         if (write_batch && !am_server)
1316                 start_write_batch(f_in);
1317         flist = recv_file_list(f_in, -1);
1318         if (inc_recurse && file_total == 1)
1319                 recv_additional_file_list(f_in);
1320
1321         if (flist && flist->used > 0) {
1322                 local_name = get_local_name(flist, argv[0]);
1323
1324                 check_alt_basis_dirs();
1325
1326                 exit_code2 = do_recv(f_in, f_out, local_name);
1327         } else {
1328                 handle_stats(-1);
1329                 output_summary();
1330         }
1331
1332         if (pid != -1) {
1333                 if (DEBUG_GTE(RECV, 1))
1334                         rprintf(FINFO,"client_run2 waiting on %d\n", (int) pid);
1335                 io_flush(FULL_FLUSH);
1336                 wait_process_with_flush(pid, &exit_code);
1337         }
1338
1339         return MAX(exit_code, exit_code2);
1340 }
1341
1342 static int copy_argv(char *argv[])
1343 {
1344         int i;
1345
1346         for (i = 0; argv[i]; i++) {
1347                 if (!(argv[i] = strdup(argv[i]))) {
1348                         rprintf (FERROR, "out of memory at %s(%d)\n",
1349                                  __FILE__, __LINE__);
1350                         return RERR_MALLOC;
1351                 }
1352         }
1353
1354         return 0;
1355 }
1356
1357
1358 /* Start a client for either type of remote connection.  Work out
1359  * whether the arguments request a remote shell or rsyncd connection,
1360  * and call the appropriate connection function, then run_client.
1361  *
1362  * Calls either start_socket_client (for sockets) or do_cmd and
1363  * client_run (for ssh). */
1364 static int start_client(int argc, char *argv[])
1365 {
1366         char *p, *shell_machine = NULL, *shell_user = NULL;
1367         char **remote_argv;
1368         int remote_argc, env_port = rsync_port;
1369         int f_in, f_out;
1370         int ret;
1371         pid_t pid;
1372
1373         /* Don't clobber argv[] so that ps(1) can still show the right
1374          * command line. */
1375         if ((ret = copy_argv(argv)) != 0)
1376                 return ret;
1377
1378         if (!read_batch) { /* for read_batch, NO source is specified */
1379                 char *path = check_for_hostspec(argv[0], &shell_machine, &rsync_port);
1380                 if (path) { /* source is remote */
1381                         char *dummy_host;
1382                         int dummy_port = 0;
1383                         *argv = path;
1384                         remote_argv = argv;
1385                         remote_argc = argc;
1386                         argv += argc - 1;
1387                         if (argc == 1 || **argv == ':')
1388                                 argc = 0; /* no dest arg */
1389                         else if (check_for_hostspec(*argv, &dummy_host, &dummy_port)) {
1390                                 rprintf(FERROR,
1391                                         "The source and destination cannot both be remote.\n");
1392                                 exit_cleanup(RERR_SYNTAX);
1393                         } else {
1394                                 remote_argc--; /* don't count dest */
1395                                 argc = 1;
1396                         }
1397                         if (filesfrom_host && *filesfrom_host && strcmp(filesfrom_host, shell_machine) != 0) {
1398                                 rprintf(FERROR,
1399                                         "--files-from hostname is not the same as the transfer hostname\n");
1400                                 exit_cleanup(RERR_SYNTAX);
1401                         }
1402                         am_sender = 0;
1403                         if (rsync_port)
1404                                 daemon_over_rsh = shell_cmd ? 1 : -1;
1405                 } else { /* source is local, check dest arg */
1406                         am_sender = 1;
1407
1408                         if (argc > 1) {
1409                                 p = argv[--argc];
1410                                 remote_argv = argv + argc;
1411                         } else {
1412                                 static char *dotarg[1] = { "." };
1413                                 p = dotarg[0];
1414                                 remote_argv = dotarg;
1415                         }
1416                         remote_argc = 1;
1417
1418                         path = check_for_hostspec(p, &shell_machine, &rsync_port);
1419                         if (path && filesfrom_host && *filesfrom_host && strcmp(filesfrom_host, shell_machine) != 0) {
1420                                 rprintf(FERROR,
1421                                         "--files-from hostname is not the same as the transfer hostname\n");
1422                                 exit_cleanup(RERR_SYNTAX);
1423                         }
1424                         if (!path) { /* no hostspec found, so src & dest are local */
1425                                 local_server = 1;
1426                                 if (filesfrom_host) {
1427                                         rprintf(FERROR,
1428                                                 "--files-from cannot be remote when the transfer is local\n");
1429                                         exit_cleanup(RERR_SYNTAX);
1430                                 }
1431                                 shell_machine = NULL;
1432                                 rsync_port = 0;
1433                         } else { /* hostspec was found, so dest is remote */
1434                                 argv[argc] = path;
1435                                 if (rsync_port)
1436                                         daemon_over_rsh = shell_cmd ? 1 : -1;
1437                         }
1438                 }
1439         } else {  /* read_batch */
1440                 local_server = 1;
1441                 if (check_for_hostspec(argv[argc-1], &shell_machine, &rsync_port)) {
1442                         rprintf(FERROR, "remote destination is not allowed with --read-batch\n");
1443                         exit_cleanup(RERR_SYNTAX);
1444                 }
1445                 remote_argv = argv += argc - 1;
1446                 remote_argc = argc = 1;
1447                 rsync_port = 0;
1448         }
1449
1450         if (!rsync_port && remote_argc && !**remote_argv) /* Turn an empty arg into a dot dir. */
1451                 *remote_argv = ".";
1452
1453         if (am_sender) {
1454                 char *dummy_host;
1455                 int dummy_port = rsync_port;
1456                 int i;
1457                 /* For local source, extra source args must not have hostspec. */
1458                 for (i = 1; i < argc; i++) {
1459                         if (check_for_hostspec(argv[i], &dummy_host, &dummy_port)) {
1460                                 rprintf(FERROR, "Unexpected remote arg: %s\n", argv[i]);
1461                                 exit_cleanup(RERR_SYNTAX);
1462                         }
1463                 }
1464         } else {
1465                 char *dummy_host;
1466                 int dummy_port = rsync_port;
1467                 int i;
1468                 /* For remote source, any extra source args must have either
1469                  * the same hostname or an empty hostname. */
1470                 for (i = 1; i < remote_argc; i++) {
1471                         char *arg = check_for_hostspec(remote_argv[i], &dummy_host, &dummy_port);
1472                         if (!arg) {
1473                                 rprintf(FERROR, "Unexpected local arg: %s\n", remote_argv[i]);
1474                                 rprintf(FERROR, "If arg is a remote file/dir, prefix it with a colon (:).\n");
1475                                 exit_cleanup(RERR_SYNTAX);
1476                         }
1477                         if (*dummy_host && strcmp(dummy_host, shell_machine) != 0) {
1478                                 rprintf(FERROR, "All source args must come from the same machine.\n");
1479                                 exit_cleanup(RERR_SYNTAX);
1480                         }
1481                         if (rsync_port != dummy_port) {
1482                                 if (!rsync_port || !dummy_port)
1483                                         rprintf(FERROR, "All source args must use the same hostspec format.\n");
1484                                 else
1485                                         rprintf(FERROR, "All source args must use the same port number.\n");
1486                                 exit_cleanup(RERR_SYNTAX);
1487                         }
1488                         if (!rsync_port && !*arg) /* Turn an empty arg into a dot dir. */
1489                                 arg = ".";
1490                         remote_argv[i] = arg;
1491                 }
1492         }
1493
1494         if (rsync_port < 0)
1495                 rsync_port = RSYNC_PORT;
1496         else
1497                 env_port = rsync_port;
1498
1499         if (daemon_over_rsh < 0)
1500                 return start_socket_client(shell_machine, remote_argc, remote_argv, argc, argv);
1501
1502         if (password_file && !daemon_over_rsh) {
1503                 rprintf(FERROR, "The --password-file option may only be "
1504                                 "used when accessing an rsync daemon.\n");
1505                 exit_cleanup(RERR_SYNTAX);
1506         }
1507
1508         if (connect_timeout) {
1509                 rprintf(FERROR, "The --contimeout option may only be "
1510                                 "used when connecting to an rsync daemon.\n");
1511                 exit_cleanup(RERR_SYNTAX);
1512         }
1513
1514         if (shell_machine) {
1515                 p = strrchr(shell_machine,'@');
1516                 if (p) {
1517                         *p = 0;
1518                         shell_user = shell_machine;
1519                         shell_machine = p+1;
1520                 }
1521         }
1522
1523         if (DEBUG_GTE(CMD, 2)) {
1524                 rprintf(FINFO,"cmd=%s machine=%s user=%s path=%s\n",
1525                         NS(shell_cmd), NS(shell_machine), NS(shell_user),
1526                         NS(remote_argv[0]));
1527         }
1528
1529 #ifdef HAVE_PUTENV
1530         if (daemon_over_rsh)
1531                 set_env_num("RSYNC_PORT", env_port);
1532 #endif
1533
1534         pid = do_cmd(shell_cmd, shell_machine, shell_user, remote_argv, remote_argc, &f_in, &f_out);
1535
1536         /* if we're running an rsync server on the remote host over a
1537          * remote shell command, we need to do the RSYNCD protocol first */
1538         if (daemon_over_rsh) {
1539                 int tmpret;
1540                 tmpret = start_inband_exchange(f_in, f_out, shell_user, remote_argc, remote_argv);
1541                 if (tmpret < 0)
1542                         return tmpret;
1543         }
1544
1545         ret = client_run(f_in, f_out, pid, argc, argv);
1546
1547         fflush(stdout);
1548         fflush(stderr);
1549
1550         return ret;
1551 }
1552
1553
1554 static void sigusr1_handler(UNUSED(int val))
1555 {
1556         called_from_signal_handler = 1;
1557         exit_cleanup(RERR_SIGNAL1);
1558 }
1559
1560 static void sigusr2_handler(UNUSED(int val))
1561 {
1562         if (!am_server)
1563                 output_summary();
1564         close_all();
1565         if (got_xfer_error)
1566                 _exit(RERR_PARTIAL);
1567         _exit(0);
1568 }
1569
1570 static void siginfo_handler(UNUSED(int val))
1571 {
1572         if (!am_server && !INFO_GTE(PROGRESS, 1))
1573                 want_progress_now = True;
1574 }
1575
1576 void remember_children(UNUSED(int val))
1577 {
1578 #ifdef WNOHANG
1579         int cnt, status;
1580         pid_t pid;
1581         /* An empty waitpid() loop was put here by Tridge and we could never
1582          * get him to explain why he put it in, so rather than taking it
1583          * out we're instead saving the child exit statuses for later use.
1584          * The waitpid() loop presumably eliminates all possibility of leaving
1585          * zombie children, maybe that's why he did it. */
1586         while ((pid = waitpid(-1, &status, WNOHANG)) > 0) {
1587                 /* save the child's exit status */
1588                 for (cnt = 0; cnt < MAXCHILDPROCS; cnt++) {
1589                         if (pid_stat_table[cnt].pid == 0) {
1590                                 pid_stat_table[cnt].pid = pid;
1591                                 pid_stat_table[cnt].status = status;
1592                                 break;
1593                         }
1594                 }
1595         }
1596 #endif
1597 #ifndef HAVE_SIGACTION
1598         signal(SIGCHLD, remember_children);
1599 #endif
1600 }
1601
1602
1603 /**
1604  * This routine catches signals and tries to send them to gdb.
1605  *
1606  * Because it's called from inside a signal handler it ought not to
1607  * use too many library routines.
1608  *
1609  * @todo Perhaps use "screen -X" instead/as well, to help people
1610  * debugging without easy access to X.  Perhaps use an environment
1611  * variable, or just call a script?
1612  *
1613  * @todo The /proc/ magic probably only works on Linux (and
1614  * Solaris?)  Can we be more portable?
1615  **/
1616 #ifdef MAINTAINER_MODE
1617 const char *get_panic_action(void)
1618 {
1619         const char *cmd_fmt = getenv("RSYNC_PANIC_ACTION");
1620
1621         if (cmd_fmt)
1622                 return cmd_fmt;
1623         return "xterm -display :0 -T Panic -n Panic -e gdb /proc/%d/exe %d";
1624 }
1625
1626
1627 /**
1628  * Handle a fatal signal by launching a debugger, controlled by $RSYNC_PANIC_ACTION.
1629  *
1630  * This signal handler is only installed if we were configured with
1631  * --enable-maintainer-mode.  Perhaps it should always be on and we
1632  * should just look at the environment variable, but I'm a bit leery
1633  * of a signal sending us into a busy loop.
1634  **/
1635 static void rsync_panic_handler(UNUSED(int whatsig))
1636 {
1637         char cmd_buf[300];
1638         int ret, pid_int = getpid();
1639
1640         snprintf(cmd_buf, sizeof cmd_buf, get_panic_action(), pid_int, pid_int);
1641
1642         /* Unless we failed to execute gdb, we allow the process to
1643          * continue.  I'm not sure if that's right. */
1644         ret = shell_exec(cmd_buf);
1645         if (ret)
1646                 _exit(ret);
1647 }
1648 #endif
1649
1650
1651 int main(int argc,char *argv[])
1652 {
1653         int ret;
1654
1655         raw_argc = argc;
1656         raw_argv = argv;
1657
1658 #ifdef HAVE_SIGACTION
1659 # ifdef HAVE_SIGPROCMASK
1660         sigset_t sigmask;
1661
1662         sigemptyset(&sigmask);
1663 # endif
1664         sigact.sa_flags = SA_NOCLDSTOP;
1665 #endif
1666         SIGACTMASK(SIGUSR1, sigusr1_handler);
1667         SIGACTMASK(SIGUSR2, sigusr2_handler);
1668         SIGACTMASK(SIGCHLD, remember_children);
1669 #ifdef MAINTAINER_MODE
1670         SIGACTMASK(SIGSEGV, rsync_panic_handler);
1671         SIGACTMASK(SIGFPE, rsync_panic_handler);
1672         SIGACTMASK(SIGABRT, rsync_panic_handler);
1673         SIGACTMASK(SIGBUS, rsync_panic_handler);
1674 #endif
1675 #ifdef SIGINFO
1676         SIGACTMASK(SIGINFO, siginfo_handler);
1677 #endif
1678 #ifdef SIGVTALRM
1679         SIGACTMASK(SIGVTALRM, siginfo_handler);
1680 #endif
1681
1682         starttime = time(NULL);
1683         our_uid = MY_UID();
1684         our_gid = MY_GID();
1685         am_root = our_uid == 0;
1686
1687         memset(&stats, 0, sizeof(stats));
1688
1689         /* Even a non-daemon runs needs the default config values to be set, e.g.
1690          * lp_dont_compress() is queried when no --skip-compress option is set. */
1691         reset_daemon_vars();
1692
1693         if (argc < 2) {
1694                 usage(FERROR);
1695                 exit_cleanup(RERR_SYNTAX);
1696         }
1697
1698         /* Get the umask for use in permission calculations.  We no longer set
1699          * it to zero; that is ugly and pointless now that all the callers that
1700          * relied on it have been reeducated to work with default ACLs. */
1701         umask(orig_umask = umask(0));
1702
1703 #if defined CONFIG_LOCALE && defined HAVE_SETLOCALE
1704         setlocale(LC_CTYPE, "");
1705 #endif
1706
1707         if (!parse_arguments(&argc, (const char ***) &argv)) {
1708                 option_error();
1709                 exit_cleanup(RERR_SYNTAX);
1710         }
1711         if (write_batch
1712          && poptDupArgv(argc, (const char **)argv, &cooked_argc, (const char ***)&cooked_argv) != 0)
1713                 out_of_memory("main");
1714
1715         SIGACTMASK(SIGINT, sig_int);
1716         SIGACTMASK(SIGHUP, sig_int);
1717         SIGACTMASK(SIGTERM, sig_int);
1718 #if defined HAVE_SIGACTION && HAVE_SIGPROCMASK
1719         sigprocmask(SIG_UNBLOCK, &sigmask, NULL);
1720 #endif
1721
1722         /* Ignore SIGPIPE; we consistently check error codes and will
1723          * see the EPIPE. */
1724         SIGACTION(SIGPIPE, SIG_IGN);
1725 #ifdef SIGXFSZ
1726         SIGACTION(SIGXFSZ, SIG_IGN);
1727 #endif
1728
1729         /* Initialize change_dir() here because on some old systems getcwd
1730          * (implemented by forking "pwd" and reading its output) doesn't
1731          * work when there are other child processes.  Also, on all systems
1732          * that implement getcwd that way "pwd" can't be found after chroot. */
1733         change_dir(NULL, CD_NORMAL);
1734
1735         if ((write_batch || read_batch) && !am_server) {
1736                 open_batch_files(); /* sets batch_fd */
1737                 if (read_batch)
1738                         read_stream_flags(batch_fd);
1739                 else
1740                         write_stream_flags(batch_fd);
1741         }
1742         if (write_batch < 0)
1743                 dry_run = 1;
1744
1745         if (am_server) {
1746 #ifdef ICONV_CONST
1747                 setup_iconv();
1748 #endif
1749         } else if (am_daemon)
1750                 return daemon_main();
1751
1752         if (am_server && protect_args) {
1753                 char buf[MAXPATHLEN];
1754                 protect_args = 2;
1755                 read_args(STDIN_FILENO, NULL, buf, sizeof buf, 1, &argv, &argc, NULL);
1756                 if (!parse_arguments(&argc, (const char ***) &argv)) {
1757                         option_error();
1758                         exit_cleanup(RERR_SYNTAX);
1759                 }
1760         }
1761
1762         if (argc < 1) {
1763                 usage(FERROR);
1764                 exit_cleanup(RERR_SYNTAX);
1765         }
1766
1767         if (am_server) {
1768                 set_nonblocking(STDIN_FILENO);
1769                 set_nonblocking(STDOUT_FILENO);
1770                 if (am_daemon)
1771                         return start_daemon(STDIN_FILENO, STDOUT_FILENO);
1772                 start_server(STDIN_FILENO, STDOUT_FILENO, argc, argv);
1773         }
1774
1775         ret = start_client(argc, argv);
1776         if (ret == -1)
1777                 exit_cleanup(RERR_STARTCLIENT);
1778         else
1779                 exit_cleanup(ret);
1780
1781         return ret;
1782 }