main.c

   1 /* -*- c-file-style: "linux" -*-
   2
   3    Copyright (C) 1996-2001 by Andrew Tridgell <tridge@samba.org>
   4    Copyright (C) Paul Mackerras 1996
   5    Copyright (C) 2001, 2002 by Martin Pool <mbp@samba.org>
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20 */
  21
  22 #include "rsync.h"
  23
  24 time_t starttime = 0;
  25
  26 extern int verbose;
  27 extern int dry_run;
  28 extern int list_only;
  29 extern int am_root;
  30 extern int am_server;
  31 extern int am_sender;
  32 extern int am_generator;
  33 extern int am_daemon;
  34 extern int blocking_io;
  35 extern int remove_sent_files;
  36 extern int daemon_over_rsh;
  37 extern int need_messages_from_generator;
  38 extern int kluge_around_eof;
  39 extern int do_stats;
  40 extern int log_got_error;
  41 extern int module_id;
  42 extern int orig_umask;
  43 extern int copy_links;
  44 extern int keep_dirlinks;
  45 extern int preserve_hard_links;
  46 extern int protocol_version;
  47 extern int recurse;
  48 extern int fuzzy_basis;
  49 extern int relative_paths;
  50 extern int rsync_port;
  51 extern int inplace;
  52 extern int make_backups;
  53 extern int whole_file;
  54 extern int read_batch;
  55 extern int write_batch;
  56 extern int batch_fd;
  57 extern int batch_gen_fd;
  58 extern int filesfrom_fd;
  59 extern pid_t cleanup_child_pid;
  60 extern struct stats stats;
  61 extern char *filesfrom_host;
  62 extern char *partial_dir;
  63 extern char *basis_dir[];
  64 extern char *rsync_path;
  65 extern char *shell_cmd;
  66 extern char *batch_name;
  67
  68 int local_server = 0;
  69 struct file_list *the_file_list;
  70
  71 /* There's probably never more than at most 2 outstanding child processes,
  72  * but set it higher, just in case. */
  73 #define MAXCHILDPROCS 5
  74
  75 struct pid_status {
  76         pid_t pid;
  77         int   status;
  78 } pid_stat_table[MAXCHILDPROCS];
  79
  80 static void show_malloc_stats(void);
  81
  82 /****************************************************************************
  83 wait for a process to exit, calling io_flush while waiting
  84 ****************************************************************************/
  85 void wait_process(pid_t pid, int *status)
  86 {
  87         pid_t waited_pid;
  88         int cnt;
  89
  90         while ((waited_pid = waitpid(pid, status, WNOHANG)) == 0) {
  91                 msleep(20);
  92                 io_flush(FULL_FLUSH);
  93         }
  94
  95         if (waited_pid == -1 && errno == ECHILD) {
  96                 /* status of requested child no longer available.
  97                  * check to see if it was processed by the sigchld_handler.
  98                  */
  99                 for (cnt = 0;  cnt < MAXCHILDPROCS; cnt++) {
 100                         if (pid == pid_stat_table[cnt].pid) {
 101                                 *status = pid_stat_table[cnt].status;
 102                                 pid_stat_table[cnt].pid = 0;
 103                                 break;
 104                         }
 105                 }
 106         }
 107
 108         /* TODO: If the child exited on a signal, then log an
 109          * appropriate error message.  Perhaps we should also accept a
 110          * message describing the purpose of the child.  Also indicate
 111          * this to the caller so that thhey know something went
 112          * wrong.  */
 113         *status = WEXITSTATUS(*status);
 114 }
 115
 116 /* This function gets called from all 3 processes.  We want the client side
 117  * to actually output the text, but the sender is the only process that has
 118  * all the stats we need.  So, if we're a client sender, we do the report.
 119  * If we're a server sender, we write the stats on the supplied fd.  If
 120  * we're the client receiver we read the stats from the supplied fd and do
 121  * the report.  All processes might also generate a set of debug stats, if
 122  * the verbose level is high enough (this is the only thing that the
 123  * generator process and the server receiver ever do here). */
 124 static void report(int f)
 125 {
 126         /* Cache two stats because the read/write code can change it. */
 127         int64 total_read = stats.total_read;
 128         int64 total_written = stats.total_written;
 129         time_t t = time(NULL);
 130
 131         if (do_stats && verbose > 1) {
 132                 /* These come out from every process */
 133                 show_malloc_stats();
 134                 show_flist_stats();
 135         }
 136
 137         if (am_generator)
 138                 return;
 139
 140         if (am_daemon) {
 141                 log_exit(0, __FILE__, __LINE__);
 142                 if (f == -1 || !am_sender)
 143                         return;
 144         }
 145
 146         if (am_server) {
 147                 if (am_sender) {
 148                         write_longint(f, total_read);
 149                         write_longint(f, total_written);
 150                         write_longint(f, stats.total_size);
 151                         if (protocol_version >= 29) {
 152                                 write_longint(f, stats.flist_buildtime);
 153                                 write_longint(f, stats.flist_xfertime);
 154                         }
 155                 }
 156                 return;
 157         }
 158
 159         /* this is the client */
 160
 161         if (!am_sender) {
 162                 /* Read the first two in opposite order because the meaning of
 163                  * read/write swaps when switching from sender to receiver. */
 164                 total_written = read_longint(f);
 165                 total_read = read_longint(f);
 166                 stats.total_size = read_longint(f);
 167                 if (protocol_version >= 29) {
 168                         stats.flist_buildtime = read_longint(f);
 169                         stats.flist_xfertime = read_longint(f);
 170                 }
 171         } else if (write_batch) {
 172                 /* The --read-batch process is going to be a client
 173                  * receiver, so we need to give it the stats. */
 174                 write_longint(batch_fd, total_read);
 175                 write_longint(batch_fd, total_written);
 176                 write_longint(batch_fd, stats.total_size);
 177                 if (protocol_version >= 29) {
 178                         write_longint(batch_fd, stats.flist_buildtime);
 179                         write_longint(batch_fd, stats.flist_xfertime);
 180                 }
 181         }
 182
 183         if (do_stats) {
 184                 rprintf(FINFO,"\nNumber of files: %d\n", stats.num_files);
 185                 rprintf(FINFO,"Number of files transferred: %d\n",
 186                         stats.num_transferred_files);
 187                 rprintf(FINFO,"Total file size: %.0f bytes\n",
 188                         (double)stats.total_size);
 189                 rprintf(FINFO,"Total transferred file size: %.0f bytes\n",
 190                         (double)stats.total_transferred_size);
 191                 rprintf(FINFO,"Literal data: %.0f bytes\n",
 192                         (double)stats.literal_data);
 193                 rprintf(FINFO,"Matched data: %.0f bytes\n",
 194                         (double)stats.matched_data);
 195                 rprintf(FINFO,"File list size: %d\n", stats.flist_size);
 196                 if (stats.flist_buildtime) {
 197                         rprintf(FINFO,
 198                                 "File list generation time: %.3f seconds\n",
 199                                 (double)stats.flist_buildtime / 1000);
 200                         rprintf(FINFO,
 201                                 "File list transfer time: %.3f seconds\n",
 202                                 (double)stats.flist_xfertime / 1000);
 203                 }
 204                 rprintf(FINFO,"Total bytes sent: %.0f\n",
 205                         (double)total_written);
 206                 rprintf(FINFO,"Total bytes received: %.0f\n",
 207                         (double)total_read);
 208         }
 209
 210         if (verbose || do_stats) {
 211                 rprintf(FINFO,
 212                         "\nsent %.0f bytes  received %.0f bytes  %.2f bytes/sec\n",
 213                         (double)total_written, (double)total_read,
 214                         (total_written + total_read)/(0.5 + (t - starttime)));
 215                 rprintf(FINFO, "total size is %.0f  speedup is %.2f\n",
 216                         (double)stats.total_size,
 217                         (double)stats.total_size / (total_written+total_read));
 218         }
 219
 220         fflush(stdout);
 221         fflush(stderr);
 222 }
 223
 224
 225 /**
 226  * If our C library can get malloc statistics, then show them to FINFO
 227  **/
 228 static void show_malloc_stats(void)
 229 {
 230 #ifdef HAVE_MALLINFO
 231         struct mallinfo mi;
 232
 233         mi = mallinfo();
 234
 235         rprintf(FINFO, "\n" RSYNC_NAME "[%d] (%s%s%s) heap statistics:\n",
 236                 getpid(), am_server ? "server " : "",
 237                 am_daemon ? "daemon " : "", who_am_i());
 238         rprintf(FINFO, "  arena:     %10ld   (bytes from sbrk)\n",
 239                 (long)mi.arena);
 240         rprintf(FINFO, "  ordblks:   %10ld   (chunks not in use)\n",
 241                 (long)mi.ordblks);
 242         rprintf(FINFO, "  smblks:    %10ld\n",
 243                 (long)mi.smblks);
 244         rprintf(FINFO, "  hblks:     %10ld   (chunks from mmap)\n",
 245                 (long)mi.hblks);
 246         rprintf(FINFO, "  hblkhd:    %10ld   (bytes from mmap)\n",
 247                 (long)mi.hblkhd);
 248         rprintf(FINFO, "  allmem:    %10ld   (bytes from sbrk + mmap)\n",
 249                 (long)mi.arena + mi.hblkhd);
 250         rprintf(FINFO, "  usmblks:   %10ld\n",
 251                 (long)mi.usmblks);
 252         rprintf(FINFO, "  fsmblks:   %10ld\n",
 253                 (long)mi.fsmblks);
 254         rprintf(FINFO, "  uordblks:  %10ld   (bytes used)\n",
 255                 (long)mi.uordblks);
 256         rprintf(FINFO, "  fordblks:  %10ld   (bytes free)\n",
 257                 (long)mi.fordblks);
 258         rprintf(FINFO, "  keepcost:  %10ld   (bytes in releasable chunk)\n",
 259                 (long)mi.keepcost);
 260 #endif /* HAVE_MALLINFO */
 261 }
 262
 263
 264 /* Start the remote shell.   cmd may be NULL to use the default. */
 265 static pid_t do_cmd(char *cmd, char *machine, char *user, char *path,
 266                     int *f_in, int *f_out)
 267 {
 268         int i, argc = 0;
 269         char *args[MAX_ARGS];
 270         pid_t ret;
 271         char *tok, *dir = NULL;
 272         int dash_l_set = 0;
 273
 274         if (!read_batch && !local_server) {
 275                 char *rsh_env = getenv(RSYNC_RSH_ENV);
 276                 if (!cmd)
 277                         cmd = rsh_env;
 278                 if (!cmd)
 279                         cmd = RSYNC_RSH;
 280                 cmd = strdup(cmd);
 281                 if (!cmd)
 282                         goto oom;
 283
 284                 for (tok = strtok(cmd, " "); tok; tok = strtok(NULL, " ")) {
 285                         /* Comparison leaves rooms for server_options(). */
 286                         if (argc >= MAX_ARGS - 100) {
 287                                 rprintf(FERROR, "internal: args[] overflowed in do_cmd()\n");
 288                                 exit_cleanup(RERR_SYNTAX);
 289                         }
 290                         args[argc++] = tok;
 291                 }
 292
 293                 /* check to see if we've already been given '-l user' in
 294                  * the remote-shell command */
 295                 for (i = 0; i < argc-1; i++) {
 296                         if (!strcmp(args[i], "-l") && args[i+1][0] != '-')
 297                                 dash_l_set = 1;
 298                 }
 299
 300 #ifdef HAVE_REMSH
 301                 /* remsh (on HPUX) takes the arguments the other way around */
 302                 args[argc++] = machine;
 303                 if (user && !(daemon_over_rsh && dash_l_set)) {
 304                         args[argc++] = "-l";
 305                         args[argc++] = user;
 306                 }
 307 #else
 308                 if (user && !(daemon_over_rsh && dash_l_set)) {
 309                         args[argc++] = "-l";
 310                         args[argc++] = user;
 311                 }
 312                 args[argc++] = machine;
 313 #endif
 314
 315                 args[argc++] = rsync_path;
 316
 317                 if (blocking_io < 0) {
 318                         char *cp;
 319                         if ((cp = strrchr(cmd, '/')) != NULL)
 320                                 cp++;
 321                         else
 322                                 cp = cmd;
 323                         if (strcmp(cp, "rsh") == 0 || strcmp(cp, "remsh") == 0)
 324                                 blocking_io = 1;
 325                 }
 326
 327                 server_options(args,&argc);
 328
 329                 if (argc >= MAX_ARGS - 2) {
 330                         rprintf(FERROR, "internal: args[] overflowed in do_cmd()\n");
 331                         exit_cleanup(RERR_SYNTAX);
 332                 }
 333         }
 334
 335         args[argc++] = ".";
 336
 337         if (!daemon_over_rsh && path && *path)
 338                 args[argc++] = path;
 339
 340         args[argc] = NULL;
 341
 342         if (verbose > 3) {
 343                 rprintf(FINFO,"cmd=");
 344                 for (i = 0; i < argc; i++)
 345                         rprintf(FINFO, "%s ", safe_fname(args[i]));
 346                 rprintf(FINFO,"\n");
 347         }
 348
 349         if (read_batch) {
 350                 int from_gen_pipe[2];
 351                 if (fd_pair(from_gen_pipe) < 0) {
 352                         rsyserr(FERROR, errno, "pipe");
 353                         exit_cleanup(RERR_IPC);
 354                 }
 355                 batch_gen_fd = from_gen_pipe[0];
 356                 *f_out = from_gen_pipe[1];
 357                 *f_in = batch_fd;
 358                 ret = -1; /* no child pid */
 359         } else if (local_server) {
 360                 /* If the user didn't request --[no-]whole-file, force
 361                  * it on, but only if we're not batch processing. */
 362                 if (whole_file < 0 && !write_batch)
 363                         whole_file = 1;
 364                 ret = local_child(argc, args, f_in, f_out, child_main);
 365         } else
 366                 ret = piped_child(args,f_in,f_out);
 367
 368         if (dir)
 369                 free(dir);
 370
 371         return ret;
 372
 373 oom:
 374         out_of_memory("do_cmd");
 375         return 0; /* not reached */
 376 }
 377
 378
 379 static char *get_local_name(struct file_list *flist,char *name)
 380 {
 381         STRUCT_STAT st;
 382         int e;
 383
 384         if (verbose > 2)
 385                 rprintf(FINFO,"get_local_name count=%d %s\n",
 386                         flist->count, NS(name));
 387
 388         if (!name)
 389                 return NULL;
 390
 391         if (do_stat(name,&st) == 0) {
 392                 if (S_ISDIR(st.st_mode)) {
 393                         if (!push_dir(name)) {
 394                                 rsyserr(FERROR, errno, "push_dir#1 %s failed",
 395                                         full_fname(name));
 396                                 exit_cleanup(RERR_FILESELECT);
 397                         }
 398                         return NULL;
 399                 }
 400                 if (flist->count > 1) {
 401                         rprintf(FERROR,"ERROR: destination must be a directory when copying more than 1 file\n");
 402                         exit_cleanup(RERR_FILESELECT);
 403                 }
 404                 return name;
 405         }
 406
 407         if (flist->count <= 1 && ((e = strlen(name)) <= 1 || name[e-1] != '/'))
 408                 return name;
 409
 410         if (do_mkdir(name,0777 & ~orig_umask) != 0) {
 411                 rsyserr(FERROR, errno, "mkdir %s failed", full_fname(name));
 412                 exit_cleanup(RERR_FILEIO);
 413         }
 414         if (verbose > 0)
 415                 rprintf(FINFO, "created directory %s\n", safe_fname(name));
 416
 417         if (dry_run) {
 418                 dry_run++;
 419                 return NULL;
 420         }
 421
 422         if (!push_dir(name)) {
 423                 rsyserr(FERROR, errno, "push_dir#2 %s failed",
 424                         full_fname(name));
 425                 exit_cleanup(RERR_FILESELECT);
 426         }
 427
 428         return NULL;
 429 }
 430
 431
 432 /* This is only called by the sender. */
 433 static void read_final_goodbye(int f_in, int f_out, int flist_count)
 434 {
 435         int i;
 436
 437         if (protocol_version < 29)
 438                 i = read_int(f_in);
 439         else {
 440                 while ((i = read_int(f_in)) == flist_count
 441                     && read_shortint(f_in) == ITEM_IS_NEW) {
 442                         /* Forward the keep-alive (no-op) to the receiver. */
 443                         write_int(f_out, flist_count);
 444                         write_shortint(f_out, ITEM_IS_NEW);
 445                 }
 446         }
 447
 448         if (i != -1) {
 449                 rprintf(FERROR, "Invalid packet from generator at end of run.\n");
 450                 exit_cleanup(RERR_PROTOCOL);
 451         }
 452 }
 453
 454
 455 static void do_server_sender(int f_in, int f_out, int argc,char *argv[])
 456 {
 457         int i;
 458         struct file_list *flist;
 459         char *dir = argv[0];
 460
 461         if (verbose > 2) {
 462                 rprintf(FINFO, "server_sender starting pid=%ld\n",
 463                         (long)getpid());
 464         }
 465
 466         if (am_daemon && lp_write_only(module_id)) {
 467                 rprintf(FERROR, "ERROR: module is write only\n");
 468                 exit_cleanup(RERR_SYNTAX);
 469                 return;
 470         }
 471         if (am_daemon && lp_read_only(module_id) && remove_sent_files) {
 472                 rprintf(FERROR,
 473                     "ERROR: --remove-sent-files cannot be used with a read-only module\n");
 474                 exit_cleanup(RERR_SYNTAX);
 475                 return;
 476         }
 477
 478         if (!relative_paths && !push_dir(dir)) {
 479                 rsyserr(FERROR, errno, "push_dir#3 %s failed",
 480                         full_fname(dir));
 481                 exit_cleanup(RERR_FILESELECT);
 482         }
 483         argc--;
 484         argv++;
 485
 486         if (strcmp(dir,".")) {
 487                 int l = strlen(dir);
 488                 if (strcmp(dir,"/") == 0)
 489                         l = 0;
 490                 for (i = 0; i < argc; i++)
 491                         argv[i] += l+1;
 492         }
 493
 494         if (argc == 0 && (recurse || list_only)) {
 495                 argc = 1;
 496                 argv--;
 497                 argv[0] = ".";
 498         }
 499
 500         flist = send_file_list(f_out,argc,argv);
 501         if (!flist || flist->count == 0) {
 502                 exit_cleanup(0);
 503         }
 504         the_file_list = flist;
 505
 506         io_start_buffering_in();
 507         io_start_buffering_out();
 508
 509         send_files(flist,f_out,f_in);
 510         io_flush(FULL_FLUSH);
 511         report(f_out);
 512         if (protocol_version >= 24)
 513                 read_final_goodbye(f_in, f_out, flist->count);
 514         io_flush(FULL_FLUSH);
 515         exit_cleanup(0);
 516 }
 517
 518
 519 static int do_recv(int f_in,int f_out,struct file_list *flist,char *local_name)
 520 {
 521         int pid;
 522         int status = 0;
 523         int error_pipe[2], name_pipe[2];
 524         BOOL need_name_pipe = (basis_dir[0] || partial_dir || fuzzy_basis
 525                             || (inplace && make_backups)) && !dry_run;
 526
 527         /* The receiving side mustn't obey this, or an existing symlink that
 528          * points to an identical file won't be replaced by the referent. */
 529         copy_links = 0;
 530
 531         if (preserve_hard_links)
 532                 init_hard_links(flist);
 533
 534         if (fd_pair(error_pipe) < 0
 535             || (need_name_pipe && fd_pair(name_pipe) < 0)) {
 536                 rsyserr(FERROR, errno, "pipe failed in do_recv");
 537                 exit_cleanup(RERR_IPC);
 538         }
 539
 540         io_flush(NORMAL_FLUSH);
 541
 542         if ((pid = do_fork()) == -1) {
 543                 rsyserr(FERROR, errno, "fork failed in do_recv");
 544                 exit_cleanup(RERR_IPC);
 545         }
 546
 547         if (pid == 0) {
 548                 close(error_pipe[0]);
 549                 if (need_name_pipe) {
 550                         close(name_pipe[1]);
 551                         set_blocking(name_pipe[0]);
 552                 } else
 553                         name_pipe[0] = -1;
 554                 if (f_in != f_out)
 555                         close(f_out);
 556
 557                 /* we can't let two processes write to the socket at one time */
 558                 close_multiplexing_out();
 559
 560                 /* set place to send errors */
 561                 set_msg_fd_out(error_pipe[1]);
 562
 563                 recv_files(f_in, flist, local_name, name_pipe[0]);
 564                 io_flush(FULL_FLUSH);
 565                 report(f_in);
 566
 567                 send_msg(MSG_DONE, "", 0);
 568                 io_flush(FULL_FLUSH);
 569
 570                 /* Handle any keep-alive packets from the post-processing work
 571                  * that the generator does. */
 572                 if (protocol_version >= 29) {
 573                         kluge_around_eof = -1;
 574
 575                         /* This should only get stopped via a USR2 signal. */
 576                         while (read_int(f_in) == flist->count
 577                             && read_shortint(f_in) == ITEM_IS_NEW) {}
 578
 579                         rprintf(FERROR, "Invalid packet from server at end of run.\n");
 580                         exit_cleanup(RERR_PROTOCOL);
 581                 }
 582
 583                 /* Finally, we go to sleep until our parent kills us with a
 584                  * USR2 signal.  We sleep for a short time, as on some OSes
 585                  * a signal won't interrupt a sleep! */
 586                 while (1)
 587                         msleep(20);
 588         }
 589
 590         am_generator = 1;
 591         close_multiplexing_in();
 592         if (write_batch)
 593                 stop_write_batch();
 594
 595         close(error_pipe[1]);
 596         if (need_name_pipe) {
 597                 close(name_pipe[0]);
 598                 set_nonblocking(name_pipe[1]);
 599         } else
 600                 name_pipe[1] = -1;
 601         if (f_in != f_out)
 602                 close(f_in);
 603
 604         io_start_buffering_out();
 605
 606         set_msg_fd_in(error_pipe[0]);
 607
 608         generate_files(f_out, flist, local_name, name_pipe[1]);
 609
 610         report(-1);
 611         io_flush(FULL_FLUSH);
 612         if (protocol_version >= 24) {
 613                 /* send a final goodbye message */
 614                 write_int(f_out, -1);
 615         }
 616         io_flush(FULL_FLUSH);
 617
 618         set_msg_fd_in(-1);
 619         kill(pid, SIGUSR2);
 620         wait_process(pid, &status);
 621         return status;
 622 }
 623
 624
 625 static void do_server_recv(int f_in, int f_out, int argc,char *argv[])
 626 {
 627         int status;
 628         struct file_list *flist;
 629         char *local_name = NULL;
 630         char *dir = NULL;
 631         int save_verbose = verbose;
 632
 633         if (filesfrom_fd >= 0) {
 634                 /* We can't mix messages with files-from data on the socket,
 635                  * so temporarily turn off verbose messages. */
 636                 verbose = 0;
 637         }
 638
 639         if (verbose > 2) {
 640                 rprintf(FINFO, "server_recv(%d) starting pid=%ld\n",
 641                         argc, (long)getpid());
 642         }
 643
 644         if (am_daemon && lp_read_only(module_id)) {
 645                 rprintf(FERROR,"ERROR: module is read only\n");
 646                 exit_cleanup(RERR_SYNTAX);
 647                 return;
 648         }
 649
 650
 651         if (argc > 0) {
 652                 dir = argv[0];
 653                 argc--;
 654                 argv++;
 655                 if (!am_daemon && !push_dir(dir)) {
 656                         rsyserr(FERROR, errno, "push_dir#4 %s failed",
 657                                 full_fname(dir));
 658                         exit_cleanup(RERR_FILESELECT);
 659                 }
 660         }
 661
 662         io_start_buffering_in();
 663         recv_filter_list(f_in);
 664
 665         if (filesfrom_fd >= 0) {
 666                 /* We need to send the files-from names to the sender at the
 667                  * same time that we receive the file-list from them, so we
 668                  * need the IO routines to automatically write out the names
 669                  * onto our f_out socket as we read the file-list.  This
 670                  * avoids both deadlock and extra delays/buffers. */
 671                 io_set_filesfrom_fds(filesfrom_fd, f_out);
 672                 filesfrom_fd = -1;
 673         }
 674
 675         flist = recv_file_list(f_in);
 676         verbose = save_verbose;
 677         if (!flist) {
 678                 rprintf(FERROR,"server_recv: recv_file_list error\n");
 679                 exit_cleanup(RERR_FILESELECT);
 680         }
 681         the_file_list = flist;
 682
 683         if (argc > 0) {
 684                 if (strcmp(dir,".")) {
 685                         argv[0] += strlen(dir);
 686                         if (argv[0][0] == '/')
 687                                 argv[0]++;
 688                 }
 689                 local_name = get_local_name(flist,argv[0]);
 690         }
 691
 692         status = do_recv(f_in,f_out,flist,local_name);
 693         exit_cleanup(status);
 694 }
 695
 696
 697 int child_main(int argc, char *argv[])
 698 {
 699         start_server(STDIN_FILENO, STDOUT_FILENO, argc, argv);
 700         return 0;
 701 }
 702
 703
 704 void start_server(int f_in, int f_out, int argc, char *argv[])
 705 {
 706         set_nonblocking(f_in);
 707         set_nonblocking(f_out);
 708
 709         io_set_sock_fds(f_in, f_out);
 710         setup_protocol(f_out, f_in);
 711
 712         if (protocol_version >= 23)
 713                 io_start_multiplex_out();
 714
 715         if (am_sender) {
 716                 keep_dirlinks = 0; /* Must be disabled on the sender. */
 717                 if (need_messages_from_generator)
 718                         io_start_multiplex_in();
 719
 720                 recv_filter_list(f_in);
 721                 do_server_sender(f_in, f_out, argc, argv);
 722         } else {
 723                 do_server_recv(f_in, f_out, argc, argv);
 724         }
 725         exit_cleanup(0);
 726 }
 727
 728
 729 /*
 730  * This is called once the connection has been negotiated.  It is used
 731  * for rsyncd, remote-shell, and local connections.
 732  */
 733 int client_run(int f_in, int f_out, pid_t pid, int argc, char *argv[])
 734 {
 735         struct file_list *flist = NULL;
 736         int status = 0, status2 = 0;
 737         char *local_name = NULL;
 738
 739         cleanup_child_pid = pid;
 740         if (!read_batch) {
 741                 set_nonblocking(f_in);
 742                 set_nonblocking(f_out);
 743         }
 744
 745         io_set_sock_fds(f_in, f_out);
 746         setup_protocol(f_out,f_in);
 747
 748         if (protocol_version >= 23 && !read_batch)
 749                 io_start_multiplex_in();
 750
 751         /* We set our stderr file handle to blocking because ssh might have
 752          * set it to non-blocking.  This can be particularly troublesome if
 753          * stderr is a clone of stdout, because ssh would have set our stdout
 754          * to non-blocking at the same time (which can easily cause us to lose
 755          * output from our print statements).  This kluge shouldn't cause ssh
 756          * any problems for how we use it.  Note also that we delayed setting
 757          * this until after the above protocol setup so that we know for sure
 758          * that ssh is done twiddling its file descriptors.  */
 759         set_blocking(STDERR_FILENO);
 760
 761         if (am_sender) {
 762                 keep_dirlinks = 0; /* Must be disabled on the sender. */
 763                 io_start_buffering_out();
 764                 if (!filesfrom_host)
 765                         set_msg_fd_in(f_in);
 766                 send_filter_list(f_out);
 767                 if (filesfrom_host)
 768                         filesfrom_fd = f_in;
 769
 770                 if (write_batch)
 771                         start_write_batch(f_out);
 772                 flist = send_file_list(f_out, argc, argv);
 773                 set_msg_fd_in(-1);
 774                 if (verbose > 3)
 775                         rprintf(FINFO,"file list sent\n");
 776                 the_file_list = flist;
 777
 778                 io_flush(NORMAL_FLUSH);
 779                 send_files(flist,f_out,f_in);
 780                 io_flush(FULL_FLUSH);
 781                 if (protocol_version >= 24)
 782                         read_final_goodbye(f_in, f_out, flist->count);
 783                 if (pid != -1) {
 784                         if (verbose > 3)
 785                                 rprintf(FINFO,"client_run waiting on %d\n", (int) pid);
 786                         io_flush(FULL_FLUSH);
 787                         wait_process(pid, &status);
 788                 }
 789                 report(-1);
 790                 io_flush(FULL_FLUSH);
 791                 exit_cleanup(status);
 792         }
 793
 794         if (need_messages_from_generator && !read_batch)
 795                 io_start_multiplex_out();
 796
 797         if (argc == 0)
 798                 list_only |= 1;
 799
 800         send_filter_list(read_batch ? -1 : f_out);
 801
 802         if (filesfrom_fd >= 0) {
 803                 io_set_filesfrom_fds(filesfrom_fd, f_out);
 804                 filesfrom_fd = -1;
 805         }
 806
 807         if (write_batch)
 808                 start_write_batch(f_in);
 809         flist = recv_file_list(f_in);
 810         if (!flist || flist->count == 0) {
 811                 rprintf(FINFO, "client: nothing to do: "
 812                         "perhaps you need to specify some filenames or "
 813                         "the --recursive option?\n");
 814                 exit_cleanup(0);
 815         }
 816         the_file_list = flist;
 817
 818         local_name = get_local_name(flist,argv[0]);
 819
 820         status2 = do_recv(f_in,f_out,flist,local_name);
 821
 822         if (pid != -1) {
 823                 if (verbose > 3)
 824                         rprintf(FINFO,"client_run2 waiting on %d\n", (int) pid);
 825                 io_flush(FULL_FLUSH);
 826                 wait_process(pid, &status);
 827         }
 828
 829         return MAX(status, status2);
 830 }
 831
 832 static int copy_argv (char *argv[])
 833 {
 834         int i;
 835
 836         for (i = 0; argv[i]; i++) {
 837                 if (!(argv[i] = strdup(argv[i]))) {
 838                         rprintf (FERROR, "out of memory at %s(%d)\n",
 839                                  __FILE__, __LINE__);
 840                         return RERR_MALLOC;
 841                 }
 842         }
 843
 844         return 0;
 845 }
 846
 847
 848 /**
 849  * Start a client for either type of remote connection.  Work out
 850  * whether the arguments request a remote shell or rsyncd connection,
 851  * and call the appropriate connection function, then run_client.
 852  *
 853  * Calls either start_socket_client (for sockets) or do_cmd and
 854  * client_run (for ssh).
 855  **/
 856 static int start_client(int argc, char *argv[])
 857 {
 858         char *p;
 859         char *shell_machine = NULL;
 860         char *shell_path = NULL;
 861         char *shell_user = NULL;
 862         int ret;
 863         pid_t pid;
 864         int f_in,f_out;
 865         int rc;
 866
 867         /* Don't clobber argv[] so that ps(1) can still show the right
 868          * command line. */
 869         if ((rc = copy_argv(argv)))
 870                 return rc;
 871
 872         if (!read_batch) { /* for read_batch, NO source is specified */
 873                 argc--;
 874                 shell_path = check_for_hostspec(argv[0], &shell_machine, &rsync_port);
 875                 if (shell_path) { /* source is remote */
 876                         argv++;
 877                         if (filesfrom_host && *filesfrom_host
 878                             && strcmp(filesfrom_host, shell_machine) != 0) {
 879                                 rprintf(FERROR,
 880                                         "--files-from hostname is not the same as the transfer hostname\n");
 881                                 exit_cleanup(RERR_SYNTAX);
 882                         }
 883                         if (rsync_port) {
 884                                 if (!shell_cmd) {
 885                                         return start_socket_client(shell_machine,
 886                                                                    shell_path,
 887                                                                    argc, argv);
 888                                 }
 889                                 daemon_over_rsh = 1;
 890                         }
 891
 892                         am_sender = 0;
 893                 } else { /* source is local, check dest arg */
 894                         am_sender = 1;
 895
 896                         if (argc < 1) { /* destination required */
 897                                 usage(FERROR);
 898                                 exit_cleanup(RERR_SYNTAX);
 899                         }
 900
 901                         shell_path = check_for_hostspec(argv[argc], &shell_machine, &rsync_port);
 902                         if (shell_path && filesfrom_host && *filesfrom_host
 903                             && strcmp(filesfrom_host, shell_machine) != 0) {
 904                                 rprintf(FERROR,
 905                                         "--files-from hostname is not the same as the transfer hostname\n");
 906                                 exit_cleanup(RERR_SYNTAX);
 907                         }
 908                         if (!shell_path) { /* no hostspec found, so src & dest are local */
 909                                 local_server = 1;
 910                                 if (filesfrom_host) {
 911                                         rprintf(FERROR,
 912                                                 "--files-from cannot be remote when the transfer is local\n");
 913                                         exit_cleanup(RERR_SYNTAX);
 914                                 }
 915                                 shell_machine = NULL;
 916                                 shell_path = argv[argc];
 917                         } else if (rsync_port) {
 918                                 if (!shell_cmd) {
 919                                         return start_socket_client(shell_machine,
 920                                                                    shell_path,
 921                                                                    argc, argv);
 922                                 }
 923                                 daemon_over_rsh = 1;
 924                         }
 925                 }
 926         } else {  /* read_batch */
 927                 local_server = 1;
 928                 shell_path = argv[argc-1];
 929                 if (check_for_hostspec(shell_path, &shell_machine, &rsync_port)) {
 930                         rprintf(FERROR, "remote destination is not allowed with --read-batch\n");
 931                         exit_cleanup(RERR_SYNTAX);
 932                 }
 933         }
 934
 935         if (shell_machine) {
 936                 p = strrchr(shell_machine,'@');
 937                 if (p) {
 938                         *p = 0;
 939                         shell_user = shell_machine;
 940                         shell_machine = p+1;
 941                 }
 942         }
 943
 944         if (verbose > 3) {
 945                 rprintf(FINFO,"cmd=%s machine=%s user=%s path=%s\n",
 946                         shell_cmd ? safe_fname(shell_cmd) : "",
 947                         shell_machine ? safe_fname(shell_machine) : "",
 948                         shell_user ? safe_fname(shell_user) : "",
 949                         shell_path ? safe_fname(shell_path) : "");
 950         }
 951
 952         /* for remote source, only single dest arg can remain ... */
 953         if (!am_sender && argc > 1) {
 954                 usage(FERROR);
 955                 exit_cleanup(RERR_SYNTAX);
 956         }
 957
 958         /* ... or no dest at all */
 959         if (!am_sender && argc == 0)
 960                 list_only |= 1;
 961
 962         pid = do_cmd(shell_cmd,shell_machine,shell_user,shell_path,
 963                      &f_in,&f_out);
 964
 965         /* if we're running an rsync server on the remote host over a
 966          * remote shell command, we need to do the RSYNCD protocol first */
 967         if (daemon_over_rsh) {
 968                 int tmpret;
 969                 tmpret = start_inband_exchange(shell_user, shell_path,
 970                                                f_in, f_out, argc);
 971                 if (tmpret < 0)
 972                         return tmpret;
 973         }
 974
 975         ret = client_run(f_in, f_out, pid, argc, argv);
 976
 977         fflush(stdout);
 978         fflush(stderr);
 979
 980         return ret;
 981 }
 982
 983
 984 static RETSIGTYPE sigusr1_handler(UNUSED(int val))
 985 {
 986         exit_cleanup(RERR_SIGNAL);
 987 }
 988
 989 static RETSIGTYPE sigusr2_handler(UNUSED(int val))
 990 {
 991         close_all();
 992         if (log_got_error) _exit(RERR_PARTIAL);
 993         _exit(0);
 994 }
 995
 996 static RETSIGTYPE sigchld_handler(UNUSED(int val))
 997 {
 998 #ifdef WNOHANG
 999         int cnt, status;
1000         pid_t pid;
1001         /* An empty waitpid() loop was put here by Tridge and we could never
1002          * get him to explain why he put it in, so rather than taking it
1003          * out we're instead saving the child exit statuses for later use.
1004          * The waitpid() loop presumably eliminates all possibility of leaving
1005          * zombie children, maybe that's why he did it.
1006          */
1007         while ((pid = waitpid(-1, &status, WNOHANG)) > 0) {
1008                 /* save the child's exit status */
1009                 for (cnt = 0; cnt < MAXCHILDPROCS; cnt++) {
1010                         if (pid_stat_table[cnt].pid == 0) {
1011                                 pid_stat_table[cnt].pid = pid;
1012                                 pid_stat_table[cnt].status = status;
1013                                 break;
1014                         }
1015                 }
1016         }
1017 #endif
1018 }
1019
1020
1021 /**
1022  * This routine catches signals and tries to send them to gdb.
1023  *
1024  * Because it's called from inside a signal handler it ought not to
1025  * use too many library routines.
1026  *
1027  * @todo Perhaps use "screen -X" instead/as well, to help people
1028  * debugging without easy access to X.  Perhaps use an environment
1029  * variable, or just call a script?
1030  *
1031  * @todo The /proc/ magic probably only works on Linux (and
1032  * Solaris?)  Can we be more portable?
1033  **/
1034 #ifdef MAINTAINER_MODE
1035 const char *get_panic_action(void)
1036 {
1037         const char *cmd_fmt = getenv("RSYNC_PANIC_ACTION");
1038
1039         if (cmd_fmt)
1040                 return cmd_fmt;
1041         else
1042                 return "xterm -display :0 -T Panic -n Panic "
1043                         "-e gdb /proc/%d/exe %d";
1044 }
1045
1046
1047 /**
1048  * Handle a fatal signal by launching a debugger, controlled by $RSYNC_PANIC_ACTION.
1049  *
1050  * This signal handler is only installed if we were configured with
1051  * --enable-maintainer-mode.  Perhaps it should always be on and we
1052  * should just look at the environment variable, but I'm a bit leery
1053  * of a signal sending us into a busy loop.
1054  **/
1055 static RETSIGTYPE rsync_panic_handler(UNUSED(int whatsig))
1056 {
1057         char cmd_buf[300];
1058         int ret;
1059
1060         sprintf(cmd_buf, get_panic_action(),
1061                 getpid(), getpid());
1062
1063         /* Unless we failed to execute gdb, we allow the process to
1064          * continue.  I'm not sure if that's right. */
1065         ret = system(cmd_buf);
1066         if (ret)
1067                 _exit(ret);
1068 }
1069 #endif
1070
1071
1072 int main(int argc,char *argv[])
1073 {
1074         int ret;
1075         int orig_argc = argc;
1076         char **orig_argv = argv;
1077
1078         signal(SIGUSR1, sigusr1_handler);
1079         signal(SIGUSR2, sigusr2_handler);
1080         signal(SIGCHLD, sigchld_handler);
1081 #ifdef MAINTAINER_MODE
1082         signal(SIGSEGV, rsync_panic_handler);
1083         signal(SIGFPE, rsync_panic_handler);
1084         signal(SIGABRT, rsync_panic_handler);
1085         signal(SIGBUS, rsync_panic_handler);
1086 #endif /* def MAINTAINER_MODE */
1087
1088         starttime = time(NULL);
1089         am_root = (MY_UID() == 0);
1090
1091         memset(&stats, 0, sizeof(stats));
1092
1093         if (argc < 2) {
1094                 usage(FERROR);
1095                 exit_cleanup(RERR_SYNTAX);
1096         }
1097
1098         /* we set a 0 umask so that correct file permissions can be
1099          * carried across */
1100         orig_umask = (int)umask(0);
1101
1102         if (!parse_arguments(&argc, (const char ***) &argv, 1)) {
1103                 /* FIXME: We ought to call the same error-handling
1104                  * code here, rather than relying on getopt. */
1105                 option_error();
1106                 exit_cleanup(RERR_SYNTAX);
1107         }
1108
1109         signal(SIGINT,SIGNAL_CAST sig_int);
1110         signal(SIGHUP,SIGNAL_CAST sig_int);
1111         signal(SIGTERM,SIGNAL_CAST sig_int);
1112
1113         /* Ignore SIGPIPE; we consistently check error codes and will
1114          * see the EPIPE. */
1115         signal(SIGPIPE, SIG_IGN);
1116
1117         /* Initialize push_dir here because on some old systems getcwd
1118          * (implemented by forking "pwd" and reading its output) doesn't
1119          * work when there are other child processes.  Also, on all systems
1120          * that implement getcwd that way "pwd" can't be found after chroot. */
1121         push_dir(NULL);
1122
1123         init_flist();
1124
1125         if (write_batch || read_batch) {
1126                 if (write_batch)
1127                         write_batch_shell_file(orig_argc, orig_argv, argc);
1128
1129                 if (read_batch && strcmp(batch_name, "-") == 0)
1130                         batch_fd = STDIN_FILENO;
1131                 else {
1132                         batch_fd = do_open(batch_name,
1133                                    write_batch ? O_WRONLY | O_CREAT | O_TRUNC
1134                                    : O_RDONLY, S_IRUSR | S_IWUSR);
1135                 }
1136                 if (batch_fd < 0) {
1137                         rsyserr(FERROR, errno, "Batch file %s open error",
1138                                 full_fname(batch_name));
1139                         exit_cleanup(RERR_FILEIO);
1140                 }
1141                 if (read_batch)
1142                         read_stream_flags(batch_fd);
1143         }
1144
1145         if (am_daemon && !am_server)
1146                 return daemon_main();
1147
1148         if (argc < 1) {
1149                 usage(FERROR);
1150                 exit_cleanup(RERR_SYNTAX);
1151         }
1152
1153         if (am_server) {
1154                 set_nonblocking(STDIN_FILENO);
1155                 set_nonblocking(STDOUT_FILENO);
1156                 if (am_daemon)
1157                         return start_daemon(STDIN_FILENO, STDOUT_FILENO);
1158                 start_server(STDIN_FILENO, STDOUT_FILENO, argc, argv);
1159         }
1160
1161         ret = start_client(argc, argv);
1162         if (ret == -1)
1163                 exit_cleanup(RERR_STARTCLIENT);
1164         else
1165                 exit_cleanup(ret);
1166
1167         return ret;
1168 }