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 static void read_final_goodbye(int f_in, int f_out, int flist_count)
 433 {
 434         if (protocol_version < 29) {
 435                 read_int(f_in);
 436                 return;
 437         }
 438
 439         /* Handle any keep-alive messages from --delete-after processing. */
 440         while (read_int(f_in) == flist_count) {
 441                 if (read_shortint(f_in) != ITEM_IS_NEW)
 442                         return; /* Complain? */
 443                 write_int(f_out, flist_count);
 444                 write_shortint(f_out, ITEM_IS_NEW);
 445         }
 446 }
 447
 448
 449 static void do_server_sender(int f_in, int f_out, int argc,char *argv[])
 450 {
 451         int i;
 452         struct file_list *flist;
 453         char *dir = argv[0];
 454
 455         if (verbose > 2) {
 456                 rprintf(FINFO, "server_sender starting pid=%ld\n",
 457                         (long)getpid());
 458         }
 459
 460         if (am_daemon && lp_write_only(module_id)) {
 461                 rprintf(FERROR, "ERROR: module is write only\n");
 462                 exit_cleanup(RERR_SYNTAX);
 463                 return;
 464         }
 465         if (am_daemon && lp_read_only(module_id) && remove_sent_files) {
 466                 rprintf(FERROR,
 467                     "ERROR: --remove-sent-files cannot be used with a read-only module\n");
 468                 exit_cleanup(RERR_SYNTAX);
 469                 return;
 470         }
 471
 472         if (!relative_paths && !push_dir(dir)) {
 473                 rsyserr(FERROR, errno, "push_dir#3 %s failed",
 474                         full_fname(dir));
 475                 exit_cleanup(RERR_FILESELECT);
 476         }
 477         argc--;
 478         argv++;
 479
 480         if (strcmp(dir,".")) {
 481                 int l = strlen(dir);
 482                 if (strcmp(dir,"/") == 0)
 483                         l = 0;
 484                 for (i = 0; i < argc; i++)
 485                         argv[i] += l+1;
 486         }
 487
 488         if (argc == 0 && (recurse || list_only)) {
 489                 argc = 1;
 490                 argv--;
 491                 argv[0] = ".";
 492         }
 493
 494         flist = send_file_list(f_out,argc,argv);
 495         if (!flist || flist->count == 0) {
 496                 exit_cleanup(0);
 497         }
 498
 499         io_start_buffering_in();
 500         io_start_buffering_out();
 501
 502         send_files(flist,f_out,f_in);
 503         io_flush(FULL_FLUSH);
 504         report(f_out);
 505         if (protocol_version >= 24)
 506                 read_final_goodbye(f_in, f_out, flist->count);
 507         io_flush(FULL_FLUSH);
 508         exit_cleanup(0);
 509 }
 510
 511
 512 static int do_recv(int f_in,int f_out,struct file_list *flist,char *local_name)
 513 {
 514         int pid;
 515         int status = 0;
 516         int error_pipe[2], name_pipe[2];
 517         BOOL need_name_pipe = (basis_dir[0] || partial_dir || fuzzy_basis
 518                             || (inplace && make_backups)) && !dry_run;
 519
 520         /* The receiving side mustn't obey this, or an existing symlink that
 521          * points to an identical file won't be replaced by the referent. */
 522         copy_links = 0;
 523
 524         if (preserve_hard_links)
 525                 init_hard_links(flist);
 526
 527         if (fd_pair(error_pipe) < 0
 528             || (need_name_pipe && fd_pair(name_pipe) < 0)) {
 529                 rsyserr(FERROR, errno, "pipe failed in do_recv");
 530                 exit_cleanup(RERR_IPC);
 531         }
 532
 533         io_flush(NORMAL_FLUSH);
 534
 535         if ((pid = do_fork()) == -1) {
 536                 rsyserr(FERROR, errno, "fork failed in do_recv");
 537                 exit_cleanup(RERR_IPC);
 538         }
 539
 540         if (pid == 0) {
 541                 close(error_pipe[0]);
 542                 if (need_name_pipe) {
 543                         close(name_pipe[1]);
 544                         set_blocking(name_pipe[0]);
 545                 } else
 546                         name_pipe[0] = -1;
 547                 if (f_in != f_out)
 548                         close(f_out);
 549
 550                 /* we can't let two processes write to the socket at one time */
 551                 close_multiplexing_out();
 552
 553                 /* set place to send errors */
 554                 set_msg_fd_out(error_pipe[1]);
 555
 556                 recv_files(f_in, flist, local_name, name_pipe[0]);
 557                 io_flush(FULL_FLUSH);
 558                 report(f_in);
 559
 560                 send_msg(MSG_DONE, "", 0);
 561                 io_flush(FULL_FLUSH);
 562
 563                 /* Handle any keep-alive packets from the post-processing work
 564                  * that the generator does. */
 565                 if (protocol_version >= 29) {
 566                         kluge_around_eof = -1;
 567                         while (read_int(f_in) == flist->count) {
 568                                 if (read_shortint(f_in) != ITEM_IS_NEW)
 569                                         break; /* Complain? */
 570                         }
 571                 }
 572
 573                 /* Finally, we hang around waiting for our parent to kills
 574                  * us with a USR2 signal.  We sleep for a short time, as on
 575                  * some OSes a signal won't interrupt a sleep! */
 576                 while (1)
 577                         msleep(20);
 578         }
 579
 580         am_generator = 1;
 581         close_multiplexing_in();
 582         if (write_batch)
 583                 stop_write_batch();
 584
 585         close(error_pipe[1]);
 586         if (need_name_pipe) {
 587                 close(name_pipe[0]);
 588                 set_nonblocking(name_pipe[1]);
 589         } else
 590                 name_pipe[1] = -1;
 591         if (f_in != f_out)
 592                 close(f_in);
 593
 594         io_start_buffering_out();
 595
 596         set_msg_fd_in(error_pipe[0]);
 597
 598         generate_files(f_out, flist, local_name, name_pipe[1]);
 599
 600         report(-1);
 601         io_flush(FULL_FLUSH);
 602         if (protocol_version >= 24) {
 603                 /* send a final goodbye message */
 604                 write_int(f_out, -1);
 605         }
 606         io_flush(FULL_FLUSH);
 607
 608         set_msg_fd_in(-1);
 609         kill(pid, SIGUSR2);
 610         wait_process(pid, &status);
 611         return status;
 612 }
 613
 614
 615 static void do_server_recv(int f_in, int f_out, int argc,char *argv[])
 616 {
 617         int status;
 618         struct file_list *flist;
 619         char *local_name = NULL;
 620         char *dir = NULL;
 621         int save_verbose = verbose;
 622
 623         if (filesfrom_fd >= 0) {
 624                 /* We can't mix messages with files-from data on the socket,
 625                  * so temporarily turn off verbose messages. */
 626                 verbose = 0;
 627         }
 628
 629         if (verbose > 2) {
 630                 rprintf(FINFO, "server_recv(%d) starting pid=%ld\n",
 631                         argc, (long)getpid());
 632         }
 633
 634         if (am_daemon && lp_read_only(module_id)) {
 635                 rprintf(FERROR,"ERROR: module is read only\n");
 636                 exit_cleanup(RERR_SYNTAX);
 637                 return;
 638         }
 639
 640
 641         if (argc > 0) {
 642                 dir = argv[0];
 643                 argc--;
 644                 argv++;
 645                 if (!am_daemon && !push_dir(dir)) {
 646                         rsyserr(FERROR, errno, "push_dir#4 %s failed",
 647                                 full_fname(dir));
 648                         exit_cleanup(RERR_FILESELECT);
 649                 }
 650         }
 651
 652         io_start_buffering_in();
 653         recv_filter_list(f_in);
 654
 655         if (filesfrom_fd >= 0) {
 656                 /* We need to send the files-from names to the sender at the
 657                  * same time that we receive the file-list from them, so we
 658                  * need the IO routines to automatically write out the names
 659                  * onto our f_out socket as we read the file-list.  This
 660                  * avoids both deadlock and extra delays/buffers. */
 661                 io_set_filesfrom_fds(filesfrom_fd, f_out);
 662                 filesfrom_fd = -1;
 663         }
 664
 665         flist = recv_file_list(f_in);
 666         verbose = save_verbose;
 667         if (!flist) {
 668                 rprintf(FERROR,"server_recv: recv_file_list error\n");
 669                 exit_cleanup(RERR_FILESELECT);
 670         }
 671
 672         if (argc > 0) {
 673                 if (strcmp(dir,".")) {
 674                         argv[0] += strlen(dir);
 675                         if (argv[0][0] == '/')
 676                                 argv[0]++;
 677                 }
 678                 local_name = get_local_name(flist,argv[0]);
 679         }
 680
 681         status = do_recv(f_in,f_out,flist,local_name);
 682         exit_cleanup(status);
 683 }
 684
 685
 686 int child_main(int argc, char *argv[])
 687 {
 688         start_server(STDIN_FILENO, STDOUT_FILENO, argc, argv);
 689         return 0;
 690 }
 691
 692
 693 void start_server(int f_in, int f_out, int argc, char *argv[])
 694 {
 695         set_nonblocking(f_in);
 696         set_nonblocking(f_out);
 697
 698         io_set_sock_fds(f_in, f_out);
 699         setup_protocol(f_out, f_in);
 700
 701         if (protocol_version >= 23)
 702                 io_start_multiplex_out();
 703
 704         if (am_sender) {
 705                 keep_dirlinks = 0; /* Must be disabled on the sender. */
 706                 if (need_messages_from_generator)
 707                         io_start_multiplex_in();
 708
 709                 recv_filter_list(f_in);
 710                 do_server_sender(f_in, f_out, argc, argv);
 711         } else {
 712                 do_server_recv(f_in, f_out, argc, argv);
 713         }
 714         exit_cleanup(0);
 715 }
 716
 717
 718 /*
 719  * This is called once the connection has been negotiated.  It is used
 720  * for rsyncd, remote-shell, and local connections.
 721  */
 722 int client_run(int f_in, int f_out, pid_t pid, int argc, char *argv[])
 723 {
 724         struct file_list *flist = NULL;
 725         int status = 0, status2 = 0;
 726         char *local_name = NULL;
 727
 728         cleanup_child_pid = pid;
 729         if (!read_batch) {
 730                 set_nonblocking(f_in);
 731                 set_nonblocking(f_out);
 732         }
 733
 734         io_set_sock_fds(f_in, f_out);
 735         setup_protocol(f_out,f_in);
 736
 737         if (protocol_version >= 23 && !read_batch)
 738                 io_start_multiplex_in();
 739
 740         /* We set our stderr file handle to blocking because ssh might have
 741          * set it to non-blocking.  This can be particularly troublesome if
 742          * stderr is a clone of stdout, because ssh would have set our stdout
 743          * to non-blocking at the same time (which can easily cause us to lose
 744          * output from our print statements).  This kluge shouldn't cause ssh
 745          * any problems for how we use it.  Note also that we delayed setting
 746          * this until after the above protocol setup so that we know for sure
 747          * that ssh is done twiddling its file descriptors.  */
 748         set_blocking(STDERR_FILENO);
 749
 750         if (am_sender) {
 751                 keep_dirlinks = 0; /* Must be disabled on the sender. */
 752                 io_start_buffering_out();
 753                 if (!remote_filesfrom_file)
 754                         set_msg_fd_in(f_in);
 755                 send_filter_list(f_out);
 756                 if (remote_filesfrom_file)
 757                         filesfrom_fd = f_in;
 758
 759                 if (write_batch)
 760                         start_write_batch(f_out);
 761                 if (!read_batch) /* don't write to pipe */
 762                         flist = send_file_list(f_out,argc,argv);
 763                 set_msg_fd_in(-1);
 764                 if (verbose > 3)
 765                         rprintf(FINFO,"file list sent\n");
 766
 767                 io_flush(NORMAL_FLUSH);
 768                 send_files(flist,f_out,f_in);
 769                 io_flush(FULL_FLUSH);
 770                 if (protocol_version >= 24)
 771                         read_final_goodbye(f_in, f_out, flist->count);
 772                 if (pid != -1) {
 773                         if (verbose > 3)
 774                                 rprintf(FINFO,"client_run waiting on %d\n", (int) pid);
 775                         io_flush(FULL_FLUSH);
 776                         wait_process(pid, &status);
 777                 }
 778                 report(-1);
 779                 io_flush(FULL_FLUSH);
 780                 exit_cleanup(status);
 781         }
 782
 783         if (need_messages_from_generator && !read_batch)
 784                 io_start_multiplex_out();
 785
 786         if (argc == 0)
 787                 list_only |= 1;
 788
 789         send_filter_list(read_batch ? -1 : f_out);
 790
 791         if (filesfrom_fd >= 0) {
 792                 io_set_filesfrom_fds(filesfrom_fd, f_out);
 793                 filesfrom_fd = -1;
 794         }
 795
 796         if (write_batch)
 797                 start_write_batch(f_in);
 798         flist = recv_file_list(f_in);
 799         if (!flist || flist->count == 0) {
 800                 rprintf(FINFO, "client: nothing to do: "
 801                         "perhaps you need to specify some filenames or "
 802                         "the --recursive option?\n");
 803                 exit_cleanup(0);
 804         }
 805
 806         local_name = get_local_name(flist,argv[0]);
 807
 808         status2 = do_recv(f_in,f_out,flist,local_name);
 809
 810         if (pid != -1) {
 811                 if (verbose > 3)
 812                         rprintf(FINFO,"client_run2 waiting on %d\n", (int) pid);
 813                 io_flush(FULL_FLUSH);
 814                 wait_process(pid, &status);
 815         }
 816
 817         return MAX(status, status2);
 818 }
 819
 820 static int copy_argv (char *argv[])
 821 {
 822         int i;
 823
 824         for (i = 0; argv[i]; i++) {
 825                 if (!(argv[i] = strdup(argv[i]))) {
 826                         rprintf (FERROR, "out of memory at %s(%d)\n",
 827                                  __FILE__, __LINE__);
 828                         return RERR_MALLOC;
 829                 }
 830         }
 831
 832         return 0;
 833 }
 834
 835
 836 /**
 837  * Start a client for either type of remote connection.  Work out
 838  * whether the arguments request a remote shell or rsyncd connection,
 839  * and call the appropriate connection function, then run_client.
 840  *
 841  * Calls either start_socket_client (for sockets) or do_cmd and
 842  * client_run (for ssh).
 843  **/
 844 static int start_client(int argc, char *argv[])
 845 {
 846         char *p;
 847         char *shell_machine = NULL;
 848         char *shell_path = NULL;
 849         char *shell_user = NULL;
 850         int ret;
 851         pid_t pid;
 852         int f_in,f_out;
 853         int rc;
 854
 855         /* Don't clobber argv[] so that ps(1) can still show the right
 856          * command line. */
 857         if ((rc = copy_argv(argv)))
 858                 return rc;
 859
 860         /* rsync:// always uses rsync server over direct socket connection */
 861         if (strncasecmp(URL_PREFIX, argv[0], strlen(URL_PREFIX)) == 0
 862             && !read_batch) {
 863                 char *host, *path;
 864
 865                 host = argv[0] + strlen(URL_PREFIX);
 866                 p = strchr(host,'/');
 867                 if (p) {
 868                         *p = '\0';
 869                         path = p+1;
 870                 } else
 871                         path = "";
 872                 if (*host == '[' && (p = strchr(host, ']')) != NULL) {
 873                         host++;
 874                         *p++ = '\0';
 875                         if (*p != ':')
 876                                 p = NULL;
 877                 } else
 878                         p = strchr(host, ':');
 879                 if (p) {
 880                         rsync_port = atoi(p+1);
 881                         *p = '\0';
 882                 }
 883                 return start_socket_client(host, path, argc-1, argv+1);
 884         }
 885
 886         if (!read_batch) { /* for read_batch, NO source is specified */
 887                 p = find_colon(argv[0]);
 888                 if (p) { /* source is remote */
 889                         if (remote_filesfrom_file
 890                          && remote_filesfrom_file != files_from + 1
 891                          && strncmp(files_from, argv[0], p-argv[0]+1) != 0) {
 892                                 rprintf(FERROR,
 893                                         "--files-from hostname is not the same as the transfer hostname\n");
 894                                 exit_cleanup(RERR_SYNTAX);
 895                         }
 896                         if (p[1] == ':') { /* double colon */
 897                                 *p = 0;
 898                                 if (!shell_cmd) {
 899                                         return start_socket_client(argv[0], p+2,
 900                                                                    argc-1, argv+1);
 901                                 }
 902                                 p++;
 903                                 daemon_over_rsh = 1;
 904                         }
 905
 906                         if (argc < 1) { /* destination required */
 907                                 usage(FERROR);
 908                                 exit_cleanup(RERR_SYNTAX);
 909                         }
 910
 911                         am_sender = 0;
 912                         *p = 0;
 913                         shell_machine = argv[0];
 914                         shell_path = p+1;
 915                         argv++;
 916                 } else { /* source is local */
 917                         am_sender = 1;
 918
 919                         /* rsync:// destination uses rsync server over direct socket */
 920                         if (strncasecmp(URL_PREFIX, argv[argc-1], strlen(URL_PREFIX)) == 0) {
 921                                 char *host, *path;
 922
 923                                 host = argv[argc-1] + strlen(URL_PREFIX);
 924                                 p = strchr(host,'/');
 925                                 if (p) {
 926                                         *p = '\0';
 927                                         path = p+1;
 928                                 } else
 929                                         path = "";
 930                                 if (*host == '[' && (p = strchr(host, ']')) != NULL) {
 931                                         host++;
 932                                         *p++ = '\0';
 933                                         if (*p != ':')
 934                                                 p = NULL;
 935                                 } else
 936                                         p = strchr(host, ':');
 937                                 if (p) {
 938                                         rsync_port = atoi(p+1);
 939                                         *p = '\0';
 940                                 }
 941                                 return start_socket_client(host, path, argc-1, argv);
 942                         }
 943
 944                         p = find_colon(argv[argc-1]); /* look in dest arg */
 945                         if (p && remote_filesfrom_file
 946                          && remote_filesfrom_file != files_from + 1
 947                          && strncmp(files_from, argv[argc-1], p-argv[argc-1]+1) != 0) {
 948                                 rprintf(FERROR,
 949                                         "--files-from hostname is not the same as the transfer hostname\n");
 950                                 exit_cleanup(RERR_SYNTAX);
 951                         }
 952                         if (!p) { /* no colon found, so src & dest are local */
 953                                 local_server = 1;
 954                                 if (remote_filesfrom_file) {
 955                                         rprintf(FERROR,
 956                                                 "--files-from cannot be remote when the transfer is local\n");
 957                                         exit_cleanup(RERR_SYNTAX);
 958                                 }
 959                         } else if (p[1] == ':') { /* double colon */
 960                                 *p = 0;
 961                                 if (!shell_cmd) {
 962                                         return start_socket_client(argv[argc-1], p+2,
 963                                                                    argc-1, argv);
 964                                 }
 965                                 p++;
 966                                 daemon_over_rsh = 1;
 967                         }
 968
 969                         if (argc < 2) {
 970                                 usage(FERROR);
 971                                 exit_cleanup(RERR_SYNTAX);
 972                         }
 973
 974                         if (local_server) {
 975                                 shell_machine = NULL;
 976                                 shell_path = argv[argc-1];
 977                         } else {
 978                                 *p = 0;
 979                                 shell_machine = argv[argc-1];
 980                                 shell_path = p+1;
 981                         }
 982                 }
 983                 argc--;
 984         } else {  /* read_batch */
 985                 local_server = 1;
 986                 shell_path = argv[argc-1];
 987                 if (find_colon(shell_path)) {
 988                         rprintf(FERROR, "remote destination is not allowed with --read-batch\n");
 989                         exit_cleanup(RERR_SYNTAX);
 990                 }
 991         }
 992
 993         if (shell_machine) {
 994                 p = strrchr(shell_machine,'@');
 995                 if (p) {
 996                         *p = 0;
 997                         shell_user = shell_machine;
 998                         shell_machine = p+1;
 999                 }
1000         }
1001
1002         if (verbose > 3) {
1003                 rprintf(FINFO,"cmd=%s machine=%s user=%s path=%s\n",
1004                         shell_cmd ? safe_fname(shell_cmd) : "",
1005                         shell_machine ? safe_fname(shell_machine) : "",
1006                         shell_user ? safe_fname(shell_user) : "",
1007                         shell_path ? safe_fname(shell_path) : "");
1008         }
1009
1010         /* for remote source, only single dest arg can remain ... */
1011         if (!am_sender && argc > 1) {
1012                 usage(FERROR);
1013                 exit_cleanup(RERR_SYNTAX);
1014         }
1015
1016         /* ... or no dest at all */
1017         if (!am_sender && argc == 0)
1018                 list_only |= 1;
1019
1020         pid = do_cmd(shell_cmd,shell_machine,shell_user,shell_path,
1021                      &f_in,&f_out);
1022
1023         /* if we're running an rsync server on the remote host over a
1024          * remote shell command, we need to do the RSYNCD protocol first */
1025         if (daemon_over_rsh) {
1026                 int tmpret;
1027                 tmpret = start_inband_exchange(shell_user, shell_path,
1028                                                f_in, f_out, argc);
1029                 if (tmpret < 0)
1030                         return tmpret;
1031         }
1032
1033         ret = client_run(f_in, f_out, pid, argc, argv);
1034
1035         fflush(stdout);
1036         fflush(stderr);
1037
1038         return ret;
1039 }
1040
1041
1042 static RETSIGTYPE sigusr1_handler(UNUSED(int val))
1043 {
1044         exit_cleanup(RERR_SIGNAL);
1045 }
1046
1047 static RETSIGTYPE sigusr2_handler(UNUSED(int val))
1048 {
1049         close_all();
1050         if (log_got_error) _exit(RERR_PARTIAL);
1051         _exit(0);
1052 }
1053
1054 static RETSIGTYPE sigchld_handler(UNUSED(int val))
1055 {
1056 #ifdef WNOHANG
1057         int cnt, status;
1058         pid_t pid;
1059         /* An empty waitpid() loop was put here by Tridge and we could never
1060          * get him to explain why he put it in, so rather than taking it
1061          * out we're instead saving the child exit statuses for later use.
1062          * The waitpid() loop presumably eliminates all possibility of leaving
1063          * zombie children, maybe that's why he did it.
1064          */
1065         while ((pid = waitpid(-1, &status, WNOHANG)) > 0) {
1066                 /* save the child's exit status */
1067                 for (cnt = 0; cnt < MAXCHILDPROCS; cnt++) {
1068                         if (pid_stat_table[cnt].pid == 0) {
1069                                 pid_stat_table[cnt].pid = pid;
1070                                 pid_stat_table[cnt].status = status;
1071                                 break;
1072                         }
1073                 }
1074         }
1075 #endif
1076 }
1077
1078
1079 /**
1080  * This routine catches signals and tries to send them to gdb.
1081  *
1082  * Because it's called from inside a signal handler it ought not to
1083  * use too many library routines.
1084  *
1085  * @todo Perhaps use "screen -X" instead/as well, to help people
1086  * debugging without easy access to X.  Perhaps use an environment
1087  * variable, or just call a script?
1088  *
1089  * @todo The /proc/ magic probably only works on Linux (and
1090  * Solaris?)  Can we be more portable?
1091  **/
1092 #ifdef MAINTAINER_MODE
1093 const char *get_panic_action(void)
1094 {
1095         const char *cmd_fmt = getenv("RSYNC_PANIC_ACTION");
1096
1097         if (cmd_fmt)
1098                 return cmd_fmt;
1099         else
1100                 return "xterm -display :0 -T Panic -n Panic "
1101                         "-e gdb /proc/%d/exe %d";
1102 }
1103
1104
1105 /**
1106  * Handle a fatal signal by launching a debugger, controlled by $RSYNC_PANIC_ACTION.
1107  *
1108  * This signal handler is only installed if we were configured with
1109  * --enable-maintainer-mode.  Perhaps it should always be on and we
1110  * should just look at the environment variable, but I'm a bit leery
1111  * of a signal sending us into a busy loop.
1112  **/
1113 static RETSIGTYPE rsync_panic_handler(UNUSED(int whatsig))
1114 {
1115         char cmd_buf[300];
1116         int ret;
1117
1118         sprintf(cmd_buf, get_panic_action(),
1119                 getpid(), getpid());
1120
1121         /* Unless we failed to execute gdb, we allow the process to
1122          * continue.  I'm not sure if that's right. */
1123         ret = system(cmd_buf);
1124         if (ret)
1125                 _exit(ret);
1126 }
1127 #endif
1128
1129
1130 int main(int argc,char *argv[])
1131 {
1132         int ret;
1133         int orig_argc = argc;
1134         char **orig_argv = argv;
1135
1136         signal(SIGUSR1, sigusr1_handler);
1137         signal(SIGUSR2, sigusr2_handler);
1138         signal(SIGCHLD, sigchld_handler);
1139 #ifdef MAINTAINER_MODE
1140         signal(SIGSEGV, rsync_panic_handler);
1141         signal(SIGFPE, rsync_panic_handler);
1142         signal(SIGABRT, rsync_panic_handler);
1143         signal(SIGBUS, rsync_panic_handler);
1144 #endif /* def MAINTAINER_MODE */
1145
1146         starttime = time(NULL);
1147         am_root = (MY_UID() == 0);
1148
1149         memset(&stats, 0, sizeof(stats));
1150
1151         if (argc < 2) {
1152                 usage(FERROR);
1153                 exit_cleanup(RERR_SYNTAX);
1154         }
1155
1156         /* we set a 0 umask so that correct file permissions can be
1157          * carried across */
1158         orig_umask = (int)umask(0);
1159
1160         if (!parse_arguments(&argc, (const char ***) &argv, 1)) {
1161                 /* FIXME: We ought to call the same error-handling
1162                  * code here, rather than relying on getopt. */
1163                 option_error();
1164                 exit_cleanup(RERR_SYNTAX);
1165         }
1166
1167         signal(SIGINT,SIGNAL_CAST sig_int);
1168         signal(SIGHUP,SIGNAL_CAST sig_int);
1169         signal(SIGTERM,SIGNAL_CAST sig_int);
1170
1171         /* Ignore SIGPIPE; we consistently check error codes and will
1172          * see the EPIPE. */
1173         signal(SIGPIPE, SIG_IGN);
1174
1175         /* Initialize push_dir here because on some old systems getcwd
1176          * (implemented by forking "pwd" and reading its output) doesn't
1177          * work when there are other child processes.  Also, on all systems
1178          * that implement getcwd that way "pwd" can't be found after chroot. */
1179         push_dir(NULL);
1180
1181         init_flist();
1182
1183         if (write_batch || read_batch) {
1184                 if (write_batch)
1185                         write_batch_shell_file(orig_argc, orig_argv, argc);
1186
1187                 if (read_batch && strcmp(batch_name, "-") == 0)
1188                         batch_fd = STDIN_FILENO;
1189                 else {
1190                         batch_fd = do_open(batch_name,
1191                                    write_batch ? O_WRONLY | O_CREAT | O_TRUNC
1192                                    : O_RDONLY, S_IRUSR | S_IWUSR);
1193                 }
1194                 if (batch_fd < 0) {
1195                         rsyserr(FERROR, errno, "Batch file %s open error",
1196                                 full_fname(batch_name));
1197                         exit_cleanup(RERR_FILEIO);
1198                 }
1199                 if (read_batch)
1200                         read_stream_flags(batch_fd);
1201         }
1202
1203         if (am_daemon && !am_server)
1204                 return daemon_main();
1205
1206         if (argc < 1) {
1207                 usage(FERROR);
1208                 exit_cleanup(RERR_SYNTAX);
1209         }
1210
1211         if (am_server) {
1212                 set_nonblocking(STDIN_FILENO);
1213                 set_nonblocking(STDOUT_FILENO);
1214                 if (am_daemon)
1215                         return start_daemon(STDIN_FILENO, STDOUT_FILENO);
1216                 start_server(STDIN_FILENO, STDOUT_FILENO, argc, argv);
1217         }
1218
1219         ret = start_client(argc, argv);
1220         if (ret == -1)
1221                 exit_cleanup(RERR_STARTCLIENT);
1222         else
1223                 exit_cleanup(ret);
1224
1225         return ret;
1226 }