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 *files_from;
  62 extern char *remote_filesfrom_file;
  63 extern char *partial_dir;
  64 extern char *basis_dir[];
  65 extern char *rsync_path;
  66 extern char *shell_cmd;
  67 extern char *batch_name;
  68
  69 int local_server = 0;
  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
 505         io_start_buffering_in();
 506         io_start_buffering_out();
 507
 508         send_files(flist,f_out,f_in);
 509         io_flush(FULL_FLUSH);
 510         report(f_out);
 511         if (protocol_version >= 24)
 512                 read_final_goodbye(f_in, f_out, flist->count);
 513         io_flush(FULL_FLUSH);
 514         exit_cleanup(0);
 515 }
 516
 517
 518 static int do_recv(int f_in,int f_out,struct file_list *flist,char *local_name)
 519 {
 520         int pid;
 521         int status = 0;
 522         int error_pipe[2], name_pipe[2];
 523         BOOL need_name_pipe = (basis_dir[0] || partial_dir || fuzzy_basis
 524                             || (inplace && make_backups)) && !dry_run;
 525
 526         /* The receiving side mustn't obey this, or an existing symlink that
 527          * points to an identical file won't be replaced by the referent. */
 528         copy_links = 0;
 529
 530         if (preserve_hard_links)
 531                 init_hard_links(flist);
 532
 533         if (fd_pair(error_pipe) < 0
 534             || (need_name_pipe && fd_pair(name_pipe) < 0)) {
 535                 rsyserr(FERROR, errno, "pipe failed in do_recv");
 536                 exit_cleanup(RERR_IPC);
 537         }
 538
 539         io_flush(NORMAL_FLUSH);
 540
 541         if ((pid = do_fork()) == -1) {
 542                 rsyserr(FERROR, errno, "fork failed in do_recv");
 543                 exit_cleanup(RERR_IPC);
 544         }
 545
 546         if (pid == 0) {
 547                 close(error_pipe[0]);
 548                 if (need_name_pipe) {
 549                         close(name_pipe[1]);
 550                         set_blocking(name_pipe[0]);
 551                 } else
 552                         name_pipe[0] = -1;
 553                 if (f_in != f_out)
 554                         close(f_out);
 555
 556                 /* we can't let two processes write to the socket at one time */
 557                 close_multiplexing_out();
 558
 559                 /* set place to send errors */
 560                 set_msg_fd_out(error_pipe[1]);
 561
 562                 recv_files(f_in, flist, local_name, name_pipe[0]);
 563                 io_flush(FULL_FLUSH);
 564                 report(f_in);
 565
 566                 send_msg(MSG_DONE, "", 0);
 567                 io_flush(FULL_FLUSH);
 568
 569                 /* Handle any keep-alive packets from the post-processing work
 570                  * that the generator does. */
 571                 if (protocol_version >= 29) {
 572                         kluge_around_eof = -1;
 573
 574                         /* This should only get stopped via a USR2 signal. */
 575                         while (read_int(f_in) == flist->count
 576                             && read_shortint(f_in) == ITEM_IS_NEW) {}
 577
 578                         rprintf(FERROR, "Invalid packet from server at end of run.\n");
 579                         exit_cleanup(RERR_PROTOCOL);
 580                 }
 581
 582                 /* Finally, we hang around waiting for our parent to kills
 583                  * us with a USR2 signal.  We sleep for a short time, as on
 584                  * some OSes a signal won't interrupt a sleep! */
 585                 while (1)
 586                         msleep(20);
 587         }
 588
 589         am_generator = 1;
 590         close_multiplexing_in();
 591         if (write_batch)
 592                 stop_write_batch();
 593
 594         close(error_pipe[1]);
 595         if (need_name_pipe) {
 596                 close(name_pipe[0]);
 597                 set_nonblocking(name_pipe[1]);
 598         } else
 599                 name_pipe[1] = -1;
 600         if (f_in != f_out)
 601                 close(f_in);
 602
 603         io_start_buffering_out();
 604
 605         set_msg_fd_in(error_pipe[0]);
 606
 607         generate_files(f_out, flist, local_name, name_pipe[1]);
 608
 609         report(-1);
 610         io_flush(FULL_FLUSH);
 611         if (protocol_version >= 24) {
 612                 /* send a final goodbye message */
 613                 write_int(f_out, -1);
 614         }
 615         io_flush(FULL_FLUSH);
 616
 617         set_msg_fd_in(-1);
 618         kill(pid, SIGUSR2);
 619         wait_process(pid, &status);
 620         return status;
 621 }
 622
 623
 624 static void do_server_recv(int f_in, int f_out, int argc,char *argv[])
 625 {
 626         int status;
 627         struct file_list *flist;
 628         char *local_name = NULL;
 629         char *dir = NULL;
 630         int save_verbose = verbose;
 631
 632         if (filesfrom_fd >= 0) {
 633                 /* We can't mix messages with files-from data on the socket,
 634                  * so temporarily turn off verbose messages. */
 635                 verbose = 0;
 636         }
 637
 638         if (verbose > 2) {
 639                 rprintf(FINFO, "server_recv(%d) starting pid=%ld\n",
 640                         argc, (long)getpid());
 641         }
 642
 643         if (am_daemon && lp_read_only(module_id)) {
 644                 rprintf(FERROR,"ERROR: module is read only\n");
 645                 exit_cleanup(RERR_SYNTAX);
 646                 return;
 647         }
 648
 649
 650         if (argc > 0) {
 651                 dir = argv[0];
 652                 argc--;
 653                 argv++;
 654                 if (!am_daemon && !push_dir(dir)) {
 655                         rsyserr(FERROR, errno, "push_dir#4 %s failed",
 656                                 full_fname(dir));
 657                         exit_cleanup(RERR_FILESELECT);
 658                 }
 659         }
 660
 661         io_start_buffering_in();
 662         recv_filter_list(f_in);
 663
 664         if (filesfrom_fd >= 0) {
 665                 /* We need to send the files-from names to the sender at the
 666                  * same time that we receive the file-list from them, so we
 667                  * need the IO routines to automatically write out the names
 668                  * onto our f_out socket as we read the file-list.  This
 669                  * avoids both deadlock and extra delays/buffers. */
 670                 io_set_filesfrom_fds(filesfrom_fd, f_out);
 671                 filesfrom_fd = -1;
 672         }
 673
 674         flist = recv_file_list(f_in);
 675         verbose = save_verbose;
 676         if (!flist) {
 677                 rprintf(FERROR,"server_recv: recv_file_list error\n");
 678                 exit_cleanup(RERR_FILESELECT);
 679         }
 680
 681         if (argc > 0) {
 682                 if (strcmp(dir,".")) {
 683                         argv[0] += strlen(dir);
 684                         if (argv[0][0] == '/')
 685                                 argv[0]++;
 686                 }
 687                 local_name = get_local_name(flist,argv[0]);
 688         }
 689
 690         status = do_recv(f_in,f_out,flist,local_name);
 691         exit_cleanup(status);
 692 }
 693
 694
 695 int child_main(int argc, char *argv[])
 696 {
 697         start_server(STDIN_FILENO, STDOUT_FILENO, argc, argv);
 698         return 0;
 699 }
 700
 701
 702 void start_server(int f_in, int f_out, int argc, char *argv[])
 703 {
 704         set_nonblocking(f_in);
 705         set_nonblocking(f_out);
 706
 707         io_set_sock_fds(f_in, f_out);
 708         setup_protocol(f_out, f_in);
 709
 710         if (protocol_version >= 23)
 711                 io_start_multiplex_out();
 712
 713         if (am_sender) {
 714                 keep_dirlinks = 0; /* Must be disabled on the sender. */
 715                 if (need_messages_from_generator)
 716                         io_start_multiplex_in();
 717
 718                 recv_filter_list(f_in);
 719                 do_server_sender(f_in, f_out, argc, argv);
 720         } else {
 721                 do_server_recv(f_in, f_out, argc, argv);
 722         }
 723         exit_cleanup(0);
 724 }
 725
 726
 727 /*
 728  * This is called once the connection has been negotiated.  It is used
 729  * for rsyncd, remote-shell, and local connections.
 730  */
 731 int client_run(int f_in, int f_out, pid_t pid, int argc, char *argv[])
 732 {
 733         struct file_list *flist = NULL;
 734         int status = 0, status2 = 0;
 735         char *local_name = NULL;
 736
 737         cleanup_child_pid = pid;
 738         if (!read_batch) {
 739                 set_nonblocking(f_in);
 740                 set_nonblocking(f_out);
 741         }
 742
 743         io_set_sock_fds(f_in, f_out);
 744         setup_protocol(f_out,f_in);
 745
 746         if (protocol_version >= 23 && !read_batch)
 747                 io_start_multiplex_in();
 748
 749         /* We set our stderr file handle to blocking because ssh might have
 750          * set it to non-blocking.  This can be particularly troublesome if
 751          * stderr is a clone of stdout, because ssh would have set our stdout
 752          * to non-blocking at the same time (which can easily cause us to lose
 753          * output from our print statements).  This kluge shouldn't cause ssh
 754          * any problems for how we use it.  Note also that we delayed setting
 755          * this until after the above protocol setup so that we know for sure
 756          * that ssh is done twiddling its file descriptors.  */
 757         set_blocking(STDERR_FILENO);
 758
 759         if (am_sender) {
 760                 keep_dirlinks = 0; /* Must be disabled on the sender. */
 761                 io_start_buffering_out();
 762                 if (!remote_filesfrom_file)
 763                         set_msg_fd_in(f_in);
 764                 send_filter_list(f_out);
 765                 if (remote_filesfrom_file)
 766                         filesfrom_fd = f_in;
 767
 768                 if (write_batch)
 769                         start_write_batch(f_out);
 770                 if (!read_batch) /* don't write to pipe */
 771                         flist = send_file_list(f_out,argc,argv);
 772                 set_msg_fd_in(-1);
 773                 if (verbose > 3)
 774                         rprintf(FINFO,"file list sent\n");
 775
 776                 io_flush(NORMAL_FLUSH);
 777                 send_files(flist,f_out,f_in);
 778                 io_flush(FULL_FLUSH);
 779                 if (protocol_version >= 24)
 780                         read_final_goodbye(f_in, f_out, flist->count);
 781                 if (pid != -1) {
 782                         if (verbose > 3)
 783                                 rprintf(FINFO,"client_run waiting on %d\n", (int) pid);
 784                         io_flush(FULL_FLUSH);
 785                         wait_process(pid, &status);
 786                 }
 787                 report(-1);
 788                 io_flush(FULL_FLUSH);
 789                 exit_cleanup(status);
 790         }
 791
 792         if (need_messages_from_generator && !read_batch)
 793                 io_start_multiplex_out();
 794
 795         if (argc == 0)
 796                 list_only |= 1;
 797
 798         send_filter_list(read_batch ? -1 : f_out);
 799
 800         if (filesfrom_fd >= 0) {
 801                 io_set_filesfrom_fds(filesfrom_fd, f_out);
 802                 filesfrom_fd = -1;
 803         }
 804
 805         if (write_batch)
 806                 start_write_batch(f_in);
 807         flist = recv_file_list(f_in);
 808         if (!flist || flist->count == 0) {
 809                 rprintf(FINFO, "client: nothing to do: "
 810                         "perhaps you need to specify some filenames or "
 811                         "the --recursive option?\n");
 812                 exit_cleanup(0);
 813         }
 814
 815         local_name = get_local_name(flist,argv[0]);
 816
 817         status2 = do_recv(f_in,f_out,flist,local_name);
 818
 819         if (pid != -1) {
 820                 if (verbose > 3)
 821                         rprintf(FINFO,"client_run2 waiting on %d\n", (int) pid);
 822                 io_flush(FULL_FLUSH);
 823                 wait_process(pid, &status);
 824         }
 825
 826         return MAX(status, status2);
 827 }
 828
 829 static int copy_argv (char *argv[])
 830 {
 831         int i;
 832
 833         for (i = 0; argv[i]; i++) {
 834                 if (!(argv[i] = strdup(argv[i]))) {
 835                         rprintf (FERROR, "out of memory at %s(%d)\n",
 836                                  __FILE__, __LINE__);
 837                         return RERR_MALLOC;
 838                 }
 839         }
 840
 841         return 0;
 842 }
 843
 844
 845 /**
 846  * Start a client for either type of remote connection.  Work out
 847  * whether the arguments request a remote shell or rsyncd connection,
 848  * and call the appropriate connection function, then run_client.
 849  *
 850  * Calls either start_socket_client (for sockets) or do_cmd and
 851  * client_run (for ssh).
 852  **/
 853 static int start_client(int argc, char *argv[])
 854 {
 855         char *p;
 856         char *shell_machine = NULL;
 857         char *shell_path = NULL;
 858         char *shell_user = NULL;
 859         int ret;
 860         pid_t pid;
 861         int f_in,f_out;
 862         int rc;
 863
 864         /* Don't clobber argv[] so that ps(1) can still show the right
 865          * command line. */
 866         if ((rc = copy_argv(argv)))
 867                 return rc;
 868
 869         /* rsync:// always uses rsync server over direct socket connection */
 870         if (strncasecmp(URL_PREFIX, argv[0], strlen(URL_PREFIX)) == 0
 871             && !read_batch) {
 872                 char *host, *path;
 873
 874                 host = argv[0] + strlen(URL_PREFIX);
 875                 p = strchr(host,'/');
 876                 if (p) {
 877                         *p = '\0';
 878                         path = p+1;
 879                 } else
 880                         path = "";
 881                 if (*host == '[' && (p = strchr(host, ']')) != NULL) {
 882                         host++;
 883                         *p++ = '\0';
 884                         if (*p != ':')
 885                                 p = NULL;
 886                 } else
 887                         p = strchr(host, ':');
 888                 if (p) {
 889                         rsync_port = atoi(p+1);
 890                         *p = '\0';
 891                 }
 892                 return start_socket_client(host, path, argc-1, argv+1);
 893         }
 894
 895         if (!read_batch) { /* for read_batch, NO source is specified */
 896                 p = find_colon(argv[0]);
 897                 if (p) { /* source is remote */
 898                         if (remote_filesfrom_file
 899                          && remote_filesfrom_file != files_from + 1
 900                          && strncmp(files_from, argv[0], p-argv[0]+1) != 0) {
 901                                 rprintf(FERROR,
 902                                         "--files-from hostname is not the same as the transfer hostname\n");
 903                                 exit_cleanup(RERR_SYNTAX);
 904                         }
 905                         if (p[1] == ':') { /* double colon */
 906                                 *p = 0;
 907                                 if (!shell_cmd) {
 908                                         return start_socket_client(argv[0], p+2,
 909                                                                    argc-1, argv+1);
 910                                 }
 911                                 p++;
 912                                 daemon_over_rsh = 1;
 913                         }
 914
 915                         if (argc < 1) { /* destination required */
 916                                 usage(FERROR);
 917                                 exit_cleanup(RERR_SYNTAX);
 918                         }
 919
 920                         am_sender = 0;
 921                         *p = 0;
 922                         shell_machine = argv[0];
 923                         shell_path = p+1;
 924                         argv++;
 925                 } else { /* source is local */
 926                         am_sender = 1;
 927
 928                         /* rsync:// destination uses rsync server over direct socket */
 929                         if (strncasecmp(URL_PREFIX, argv[argc-1], strlen(URL_PREFIX)) == 0) {
 930                                 char *host, *path;
 931
 932                                 host = argv[argc-1] + strlen(URL_PREFIX);
 933                                 p = strchr(host,'/');
 934                                 if (p) {
 935                                         *p = '\0';
 936                                         path = p+1;
 937                                 } else
 938                                         path = "";
 939                                 if (*host == '[' && (p = strchr(host, ']')) != NULL) {
 940                                         host++;
 941                                         *p++ = '\0';
 942                                         if (*p != ':')
 943                                                 p = NULL;
 944                                 } else
 945                                         p = strchr(host, ':');
 946                                 if (p) {
 947                                         rsync_port = atoi(p+1);
 948                                         *p = '\0';
 949                                 }
 950                                 return start_socket_client(host, path, argc-1, argv);
 951                         }
 952
 953                         p = find_colon(argv[argc-1]); /* look in dest arg */
 954                         if (p && remote_filesfrom_file
 955                          && remote_filesfrom_file != files_from + 1
 956                          && strncmp(files_from, argv[argc-1], p-argv[argc-1]+1) != 0) {
 957                                 rprintf(FERROR,
 958                                         "--files-from hostname is not the same as the transfer hostname\n");
 959                                 exit_cleanup(RERR_SYNTAX);
 960                         }
 961                         if (!p) { /* no colon found, so src & dest are local */
 962                                 local_server = 1;
 963                                 if (remote_filesfrom_file) {
 964                                         rprintf(FERROR,
 965                                                 "--files-from cannot be remote when the transfer is local\n");
 966                                         exit_cleanup(RERR_SYNTAX);
 967                                 }
 968                         } else if (p[1] == ':') { /* double colon */
 969                                 *p = 0;
 970                                 if (!shell_cmd) {
 971                                         return start_socket_client(argv[argc-1], p+2,
 972                                                                    argc-1, argv);
 973                                 }
 974                                 p++;
 975                                 daemon_over_rsh = 1;
 976                         }
 977
 978                         if (argc < 2) {
 979                                 usage(FERROR);
 980                                 exit_cleanup(RERR_SYNTAX);
 981                         }
 982
 983                         if (local_server) {
 984                                 shell_machine = NULL;
 985                                 shell_path = argv[argc-1];
 986                         } else {
 987                                 *p = 0;
 988                                 shell_machine = argv[argc-1];
 989                                 shell_path = p+1;
 990                         }
 991                 }
 992                 argc--;
 993         } else {  /* read_batch */
 994                 local_server = 1;
 995                 shell_path = argv[argc-1];
 996                 if (find_colon(shell_path)) {
 997                         rprintf(FERROR, "remote destination is not allowed with --read-batch\n");
 998                         exit_cleanup(RERR_SYNTAX);
 999                 }
1000         }
1001
1002         if (shell_machine) {
1003                 p = strrchr(shell_machine,'@');
1004                 if (p) {
1005                         *p = 0;
1006                         shell_user = shell_machine;
1007                         shell_machine = p+1;
1008                 }
1009         }
1010
1011         if (verbose > 3) {
1012                 rprintf(FINFO,"cmd=%s machine=%s user=%s path=%s\n",
1013                         shell_cmd ? safe_fname(shell_cmd) : "",
1014                         shell_machine ? safe_fname(shell_machine) : "",
1015                         shell_user ? safe_fname(shell_user) : "",
1016                         shell_path ? safe_fname(shell_path) : "");
1017         }
1018
1019         /* for remote source, only single dest arg can remain ... */
1020         if (!am_sender && argc > 1) {
1021                 usage(FERROR);
1022                 exit_cleanup(RERR_SYNTAX);
1023         }
1024
1025         /* ... or no dest at all */
1026         if (!am_sender && argc == 0)
1027                 list_only |= 1;
1028
1029         pid = do_cmd(shell_cmd,shell_machine,shell_user,shell_path,
1030                      &f_in,&f_out);
1031
1032         /* if we're running an rsync server on the remote host over a
1033          * remote shell command, we need to do the RSYNCD protocol first */
1034         if (daemon_over_rsh) {
1035                 int tmpret;
1036                 tmpret = start_inband_exchange(shell_user, shell_path,
1037                                                f_in, f_out, argc);
1038                 if (tmpret < 0)
1039                         return tmpret;
1040         }
1041
1042         ret = client_run(f_in, f_out, pid, argc, argv);
1043
1044         fflush(stdout);
1045         fflush(stderr);
1046
1047         return ret;
1048 }
1049
1050
1051 static RETSIGTYPE sigusr1_handler(UNUSED(int val))
1052 {
1053         exit_cleanup(RERR_SIGNAL);
1054 }
1055
1056 static RETSIGTYPE sigusr2_handler(UNUSED(int val))
1057 {
1058         close_all();
1059         if (log_got_error) _exit(RERR_PARTIAL);
1060         _exit(0);
1061 }
1062
1063 static RETSIGTYPE sigchld_handler(UNUSED(int val))
1064 {
1065 #ifdef WNOHANG
1066         int cnt, status;
1067         pid_t pid;
1068         /* An empty waitpid() loop was put here by Tridge and we could never
1069          * get him to explain why he put it in, so rather than taking it
1070          * out we're instead saving the child exit statuses for later use.
1071          * The waitpid() loop presumably eliminates all possibility of leaving
1072          * zombie children, maybe that's why he did it.
1073          */
1074         while ((pid = waitpid(-1, &status, WNOHANG)) > 0) {
1075                 /* save the child's exit status */
1076                 for (cnt = 0; cnt < MAXCHILDPROCS; cnt++) {
1077                         if (pid_stat_table[cnt].pid == 0) {
1078                                 pid_stat_table[cnt].pid = pid;
1079                                 pid_stat_table[cnt].status = status;
1080                                 break;
1081                         }
1082                 }
1083         }
1084 #endif
1085 }
1086
1087
1088 /**
1089  * This routine catches signals and tries to send them to gdb.
1090  *
1091  * Because it's called from inside a signal handler it ought not to
1092  * use too many library routines.
1093  *
1094  * @todo Perhaps use "screen -X" instead/as well, to help people
1095  * debugging without easy access to X.  Perhaps use an environment
1096  * variable, or just call a script?
1097  *
1098  * @todo The /proc/ magic probably only works on Linux (and
1099  * Solaris?)  Can we be more portable?
1100  **/
1101 #ifdef MAINTAINER_MODE
1102 const char *get_panic_action(void)
1103 {
1104         const char *cmd_fmt = getenv("RSYNC_PANIC_ACTION");
1105
1106         if (cmd_fmt)
1107                 return cmd_fmt;
1108         else
1109                 return "xterm -display :0 -T Panic -n Panic "
1110                         "-e gdb /proc/%d/exe %d";
1111 }
1112
1113
1114 /**
1115  * Handle a fatal signal by launching a debugger, controlled by $RSYNC_PANIC_ACTION.
1116  *
1117  * This signal handler is only installed if we were configured with
1118  * --enable-maintainer-mode.  Perhaps it should always be on and we
1119  * should just look at the environment variable, but I'm a bit leery
1120  * of a signal sending us into a busy loop.
1121  **/
1122 static RETSIGTYPE rsync_panic_handler(UNUSED(int whatsig))
1123 {
1124         char cmd_buf[300];
1125         int ret;
1126
1127         sprintf(cmd_buf, get_panic_action(),
1128                 getpid(), getpid());
1129
1130         /* Unless we failed to execute gdb, we allow the process to
1131          * continue.  I'm not sure if that's right. */
1132         ret = system(cmd_buf);
1133         if (ret)
1134                 _exit(ret);
1135 }
1136 #endif
1137
1138
1139 int main(int argc,char *argv[])
1140 {
1141         int ret;
1142         int orig_argc = argc;
1143         char **orig_argv = argv;
1144
1145         signal(SIGUSR1, sigusr1_handler);
1146         signal(SIGUSR2, sigusr2_handler);
1147         signal(SIGCHLD, sigchld_handler);
1148 #ifdef MAINTAINER_MODE
1149         signal(SIGSEGV, rsync_panic_handler);
1150         signal(SIGFPE, rsync_panic_handler);
1151         signal(SIGABRT, rsync_panic_handler);
1152         signal(SIGBUS, rsync_panic_handler);
1153 #endif /* def MAINTAINER_MODE */
1154
1155         starttime = time(NULL);
1156         am_root = (MY_UID() == 0);
1157
1158         memset(&stats, 0, sizeof(stats));
1159
1160         if (argc < 2) {
1161                 usage(FERROR);
1162                 exit_cleanup(RERR_SYNTAX);
1163         }
1164
1165         /* we set a 0 umask so that correct file permissions can be
1166          * carried across */
1167         orig_umask = (int)umask(0);
1168
1169         if (!parse_arguments(&argc, (const char ***) &argv, 1)) {
1170                 /* FIXME: We ought to call the same error-handling
1171                  * code here, rather than relying on getopt. */
1172                 option_error();
1173                 exit_cleanup(RERR_SYNTAX);
1174         }
1175
1176         signal(SIGINT,SIGNAL_CAST sig_int);
1177         signal(SIGHUP,SIGNAL_CAST sig_int);
1178         signal(SIGTERM,SIGNAL_CAST sig_int);
1179
1180         /* Ignore SIGPIPE; we consistently check error codes and will
1181          * see the EPIPE. */
1182         signal(SIGPIPE, SIG_IGN);
1183
1184         /* Initialize push_dir here because on some old systems getcwd
1185          * (implemented by forking "pwd" and reading its output) doesn't
1186          * work when there are other child processes.  Also, on all systems
1187          * that implement getcwd that way "pwd" can't be found after chroot. */
1188         push_dir(NULL);
1189
1190         init_flist();
1191
1192         if (write_batch || read_batch) {
1193                 if (write_batch)
1194                         write_batch_shell_file(orig_argc, orig_argv, argc);
1195
1196                 if (read_batch && strcmp(batch_name, "-") == 0)
1197                         batch_fd = STDIN_FILENO;
1198                 else {
1199                         batch_fd = do_open(batch_name,
1200                                    write_batch ? O_WRONLY | O_CREAT | O_TRUNC
1201                                    : O_RDONLY, S_IRUSR | S_IWUSR);
1202                 }
1203                 if (batch_fd < 0) {
1204                         rsyserr(FERROR, errno, "Batch file %s open error",
1205                                 full_fname(batch_name));
1206                         exit_cleanup(RERR_FILEIO);
1207                 }
1208                 if (read_batch)
1209                         read_stream_flags(batch_fd);
1210         }
1211
1212         if (am_daemon && !am_server)
1213                 return daemon_main();
1214
1215         if (argc < 1) {
1216                 usage(FERROR);
1217                 exit_cleanup(RERR_SYNTAX);
1218         }
1219
1220         if (am_server) {
1221                 set_nonblocking(STDIN_FILENO);
1222                 set_nonblocking(STDOUT_FILENO);
1223                 if (am_daemon)
1224                         return start_daemon(STDIN_FILENO, STDOUT_FILENO);
1225                 start_server(STDIN_FILENO, STDOUT_FILENO, argc, argv);
1226         }
1227
1228         ret = start_client(argc, argv);
1229         if (ret == -1)
1230                 exit_cleanup(RERR_STARTCLIENT);
1231         else
1232                 exit_cleanup(ret);
1233
1234         return ret;
1235 }