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 delete_before;
  36 extern int remove_sent_files;
  37 extern int daemon_over_rsh;
  38 extern int need_messages_from_generator;
  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 whole_file;
  52 extern int read_batch;
  53 extern int write_batch;
  54 extern int batch_fd;
  55 extern int batch_gen_fd;
  56 extern int filesfrom_fd;
  57 extern pid_t cleanup_child_pid;
  58 extern struct stats stats;
  59 extern char *files_from;
  60 extern char *remote_filesfrom_file;
  61 extern char *partial_dir;
  62 extern char *basis_dir[];
  63 extern char *rsync_path;
  64 extern char *shell_cmd;
  65 extern char *batch_name;
  66
  67 int local_server = 0;
  68
  69 /* There's probably never more than at most 2 outstanding child processes,
  70  * but set it higher, just in case. */
  71 #define MAXCHILDPROCS 5
  72
  73 struct pid_status {
  74         pid_t pid;
  75         int   status;
  76 } pid_stat_table[MAXCHILDPROCS];
  77
  78 static void show_malloc_stats(void);
  79
  80 /****************************************************************************
  81 wait for a process to exit, calling io_flush while waiting
  82 ****************************************************************************/
  83 void wait_process(pid_t pid, int *status)
  84 {
  85         pid_t waited_pid;
  86         int cnt;
  87
  88         while ((waited_pid = waitpid(pid, status, WNOHANG)) == 0) {
  89                 msleep(20);
  90                 io_flush(FULL_FLUSH);
  91         }
  92
  93         if (waited_pid == -1 && errno == ECHILD) {
  94                 /* status of requested child no longer available.
  95                  * check to see if it was processed by the sigchld_handler.
  96                  */
  97                 for (cnt = 0;  cnt < MAXCHILDPROCS; cnt++) {
  98                         if (pid == pid_stat_table[cnt].pid) {
  99                                 *status = pid_stat_table[cnt].status;
 100                                 pid_stat_table[cnt].pid = 0;
 101                                 break;
 102                         }
 103                 }
 104         }
 105
 106         /* TODO: If the child exited on a signal, then log an
 107          * appropriate error message.  Perhaps we should also accept a
 108          * message describing the purpose of the child.  Also indicate
 109          * this to the caller so that thhey know something went
 110          * wrong.  */
 111         *status = WEXITSTATUS(*status);
 112 }
 113
 114 /* This function gets called from all 3 processes.  We want the client side
 115  * to actually output the text, but the sender is the only process that has
 116  * all the stats we need.  So, if we're a client sender, we do the report.
 117  * If we're a server sender, we write the stats on the supplied fd.  If
 118  * we're the client receiver we read the stats from the supplied fd and do
 119  * the report.  All processes might also generate a set of debug stats, if
 120  * the verbose level is high enough (this is the only thing that the
 121  * generator process and the server receiver ever do here). */
 122 static void report(int f)
 123 {
 124         /* Cache two stats because the read/write code can change it. */
 125         int64 total_read = stats.total_read;
 126         int64 total_written = stats.total_written;
 127         time_t t = time(NULL);
 128
 129         if (do_stats && verbose > 1) {
 130                 /* These come out from every process */
 131                 show_malloc_stats();
 132                 show_flist_stats();
 133         }
 134
 135         if (am_generator)
 136                 return;
 137
 138         if (am_daemon) {
 139                 log_exit(0, __FILE__, __LINE__);
 140                 if (f == -1 || !am_sender)
 141                         return;
 142         }
 143
 144         if (am_server) {
 145                 if (am_sender) {
 146                         write_longint(f, total_read);
 147                         write_longint(f, total_written);
 148                         write_longint(f, stats.total_size);
 149                         if (protocol_version >= 29) {
 150                                 write_longint(f, stats.flist_buildtime);
 151                                 write_longint(f, stats.flist_xfertime);
 152                         }
 153                 }
 154                 return;
 155         }
 156
 157         /* this is the client */
 158
 159         if (!am_sender) {
 160                 /* Read the first two in opposite order because the meaning of
 161                  * read/write swaps when switching from sender to receiver. */
 162                 total_written = read_longint(f);
 163                 total_read = read_longint(f);
 164                 stats.total_size = read_longint(f);
 165                 if (protocol_version >= 29) {
 166                         stats.flist_buildtime = read_longint(f);
 167                         stats.flist_xfertime = read_longint(f);
 168                 }
 169         } else if (write_batch) {
 170                 /* The --read-batch process is going to be a client
 171                  * receiver, so we need to give it the stats. */
 172                 write_longint(batch_fd, total_read);
 173                 write_longint(batch_fd, total_written);
 174                 write_longint(batch_fd, stats.total_size);
 175                 if (protocol_version >= 29) {
 176                         write_longint(batch_fd, stats.flist_buildtime);
 177                         write_longint(batch_fd, stats.flist_xfertime);
 178                 }
 179         }
 180
 181         if (do_stats) {
 182                 rprintf(FINFO,"\nNumber of files: %d\n", stats.num_files);
 183                 rprintf(FINFO,"Number of files transferred: %d\n",
 184                         stats.num_transferred_files);
 185                 rprintf(FINFO,"Total file size: %.0f bytes\n",
 186                         (double)stats.total_size);
 187                 rprintf(FINFO,"Total transferred file size: %.0f bytes\n",
 188                         (double)stats.total_transferred_size);
 189                 rprintf(FINFO,"Literal data: %.0f bytes\n",
 190                         (double)stats.literal_data);
 191                 rprintf(FINFO,"Matched data: %.0f bytes\n",
 192                         (double)stats.matched_data);
 193                 rprintf(FINFO,"File list size: %d\n", stats.flist_size);
 194                 if (stats.flist_buildtime) {
 195                         rprintf(FINFO,
 196                                 "File list generation time: %.3f seconds\n",
 197                                 (double)stats.flist_buildtime / 1000);
 198                         rprintf(FINFO,
 199                                 "File list transfer time: %.3f seconds\n",
 200                                 (double)stats.flist_xfertime / 1000);
 201                 }
 202                 rprintf(FINFO,"Total bytes sent: %.0f\n",
 203                         (double)total_written);
 204                 rprintf(FINFO,"Total bytes received: %.0f\n",
 205                         (double)total_read);
 206         }
 207
 208         if (verbose || do_stats) {
 209                 rprintf(FINFO,
 210                         "\nsent %.0f bytes  received %.0f bytes  %.2f bytes/sec\n",
 211                         (double)total_written, (double)total_read,
 212                         (total_written + total_read)/(0.5 + (t - starttime)));
 213                 rprintf(FINFO, "total size is %.0f  speedup is %.2f\n",
 214                         (double)stats.total_size,
 215                         (double)stats.total_size / (total_written+total_read));
 216         }
 217
 218         fflush(stdout);
 219         fflush(stderr);
 220 }
 221
 222
 223 /**
 224  * If our C library can get malloc statistics, then show them to FINFO
 225  **/
 226 static void show_malloc_stats(void)
 227 {
 228 #ifdef HAVE_MALLINFO
 229         struct mallinfo mi;
 230
 231         mi = mallinfo();
 232
 233         rprintf(FINFO, "\n" RSYNC_NAME "[%d] (%s%s%s) heap statistics:\n",
 234                 getpid(), am_server ? "server " : "",
 235                 am_daemon ? "daemon " : "", who_am_i());
 236         rprintf(FINFO, "  arena:     %10ld   (bytes from sbrk)\n",
 237                 (long)mi.arena);
 238         rprintf(FINFO, "  ordblks:   %10ld   (chunks not in use)\n",
 239                 (long)mi.ordblks);
 240         rprintf(FINFO, "  smblks:    %10ld\n",
 241                 (long)mi.smblks);
 242         rprintf(FINFO, "  hblks:     %10ld   (chunks from mmap)\n",
 243                 (long)mi.hblks);
 244         rprintf(FINFO, "  hblkhd:    %10ld   (bytes from mmap)\n",
 245                 (long)mi.hblkhd);
 246         rprintf(FINFO, "  allmem:    %10ld   (bytes from sbrk + mmap)\n",
 247                 (long)mi.arena + mi.hblkhd);
 248         rprintf(FINFO, "  usmblks:   %10ld\n",
 249                 (long)mi.usmblks);
 250         rprintf(FINFO, "  fsmblks:   %10ld\n",
 251                 (long)mi.fsmblks);
 252         rprintf(FINFO, "  uordblks:  %10ld   (bytes used)\n",
 253                 (long)mi.uordblks);
 254         rprintf(FINFO, "  fordblks:  %10ld   (bytes free)\n",
 255                 (long)mi.fordblks);
 256         rprintf(FINFO, "  keepcost:  %10ld   (bytes in releasable chunk)\n",
 257                 (long)mi.keepcost);
 258 #endif /* HAVE_MALLINFO */
 259 }
 260
 261
 262 /* Start the remote shell.   cmd may be NULL to use the default. */
 263 static pid_t do_cmd(char *cmd, char *machine, char *user, char *path,
 264                     int *f_in, int *f_out)
 265 {
 266         int i, argc = 0;
 267         char *args[MAX_ARGS];
 268         pid_t ret;
 269         char *tok, *dir = NULL;
 270         int dash_l_set = 0;
 271
 272         if (!read_batch && !local_server) {
 273                 char *rsh_env = getenv(RSYNC_RSH_ENV);
 274                 if (!cmd)
 275                         cmd = rsh_env;
 276                 if (!cmd)
 277                         cmd = RSYNC_RSH;
 278                 cmd = strdup(cmd);
 279                 if (!cmd)
 280                         goto oom;
 281
 282                 for (tok = strtok(cmd, " "); tok; tok = strtok(NULL, " ")) {
 283                         /* Comparison leaves rooms for server_options(). */
 284                         if (argc >= MAX_ARGS - 100) {
 285                                 rprintf(FERROR, "internal: args[] overflowed in do_cmd()\n");
 286                                 exit_cleanup(RERR_SYNTAX);
 287                         }
 288                         args[argc++] = tok;
 289                 }
 290
 291                 /* check to see if we've already been given '-l user' in
 292                  * the remote-shell command */
 293                 for (i = 0; i < argc-1; i++) {
 294                         if (!strcmp(args[i], "-l") && args[i+1][0] != '-')
 295                                 dash_l_set = 1;
 296                 }
 297
 298 #ifdef HAVE_REMSH
 299                 /* remsh (on HPUX) takes the arguments the other way around */
 300                 args[argc++] = machine;
 301                 if (user && !(daemon_over_rsh && dash_l_set)) {
 302                         args[argc++] = "-l";
 303                         args[argc++] = user;
 304                 }
 305 #else
 306                 if (user && !(daemon_over_rsh && dash_l_set)) {
 307                         args[argc++] = "-l";
 308                         args[argc++] = user;
 309                 }
 310                 args[argc++] = machine;
 311 #endif
 312
 313                 args[argc++] = rsync_path;
 314
 315                 if (blocking_io < 0) {
 316                         char *cp;
 317                         if ((cp = strrchr(cmd, '/')) != NULL)
 318                                 cp++;
 319                         else
 320                                 cp = cmd;
 321                         if (strcmp(cp, "rsh") == 0 || strcmp(cp, "remsh") == 0)
 322                                 blocking_io = 1;
 323                 }
 324
 325                 server_options(args,&argc);
 326
 327                 if (argc >= MAX_ARGS - 2) {
 328                         rprintf(FERROR, "internal: args[] overflowed in do_cmd()\n");
 329                         exit_cleanup(RERR_SYNTAX);
 330                 }
 331         }
 332
 333         args[argc++] = ".";
 334
 335         if (!daemon_over_rsh && path && *path)
 336                 args[argc++] = path;
 337
 338         args[argc] = NULL;
 339
 340         if (verbose > 3) {
 341                 rprintf(FINFO,"cmd=");
 342                 for (i = 0; i < argc; i++)
 343                         rprintf(FINFO, "%s ", safe_fname(args[i]));
 344                 rprintf(FINFO,"\n");
 345         }
 346
 347         if (read_batch) {
 348                 int from_gen_pipe[2];
 349                 if (fd_pair(from_gen_pipe) < 0) {
 350                         rsyserr(FERROR, errno, "pipe");
 351                         exit_cleanup(RERR_IPC);
 352                 }
 353                 batch_gen_fd = from_gen_pipe[0];
 354                 *f_out = from_gen_pipe[1];
 355                 *f_in = batch_fd;
 356                 ret = -1; /* no child pid */
 357         } else if (local_server) {
 358                 /* If the user didn't request --[no-]whole-file, force
 359                  * it on, but only if we're not batch processing. */
 360                 if (whole_file < 0 && !write_batch)
 361                         whole_file = 1;
 362                 ret = local_child(argc, args, f_in, f_out, child_main);
 363         } else
 364                 ret = piped_child(args,f_in,f_out);
 365
 366         if (dir)
 367                 free(dir);
 368
 369         return ret;
 370
 371 oom:
 372         out_of_memory("do_cmd");
 373         return 0; /* not reached */
 374 }
 375
 376
 377 static char *get_local_name(struct file_list *flist,char *name)
 378 {
 379         STRUCT_STAT st;
 380         int e;
 381
 382         if (verbose > 2)
 383                 rprintf(FINFO,"get_local_name count=%d %s\n",
 384                         flist->count, NS(name));
 385
 386         if (!name)
 387                 return NULL;
 388
 389         if (do_stat(name,&st) == 0) {
 390                 if (S_ISDIR(st.st_mode)) {
 391                         if (!push_dir(name)) {
 392                                 rsyserr(FERROR, errno, "push_dir#1 %s failed",
 393                                         full_fname(name));
 394                                 exit_cleanup(RERR_FILESELECT);
 395                         }
 396                         return NULL;
 397                 }
 398                 if (flist->count > 1) {
 399                         rprintf(FERROR,"ERROR: destination must be a directory when copying more than 1 file\n");
 400                         exit_cleanup(RERR_FILESELECT);
 401                 }
 402                 return name;
 403         }
 404
 405         if (flist->count <= 1 && ((e = strlen(name)) <= 1 || name[e-1] != '/'))
 406                 return name;
 407
 408         if (do_mkdir(name,0777 & ~orig_umask) != 0) {
 409                 rsyserr(FERROR, errno, "mkdir %s failed", full_fname(name));
 410                 exit_cleanup(RERR_FILEIO);
 411         }
 412         if (verbose > 0)
 413                 rprintf(FINFO, "created directory %s\n", safe_fname(name));
 414
 415         if (dry_run) {
 416                 dry_run++;
 417                 return NULL;
 418         }
 419
 420         if (!push_dir(name)) {
 421                 rsyserr(FERROR, errno, "push_dir#2 %s failed",
 422                         full_fname(name));
 423                 exit_cleanup(RERR_FILESELECT);
 424         }
 425
 426         return NULL;
 427 }
 428
 429
 430 static void do_server_sender(int f_in, int f_out, int argc,char *argv[])
 431 {
 432         int i;
 433         struct file_list *flist;
 434         char *dir = argv[0];
 435
 436         if (verbose > 2) {
 437                 rprintf(FINFO, "server_sender starting pid=%ld\n",
 438                         (long)getpid());
 439         }
 440
 441         if (am_daemon && lp_write_only(module_id)) {
 442                 rprintf(FERROR, "ERROR: module is write only\n");
 443                 exit_cleanup(RERR_SYNTAX);
 444                 return;
 445         }
 446         if (am_daemon && lp_read_only(module_id) && remove_sent_files) {
 447                 rprintf(FERROR,
 448                     "ERROR: --remove-sent-files cannot be used with a read-only module\n");
 449                 exit_cleanup(RERR_SYNTAX);
 450                 return;
 451         }
 452
 453         if (!relative_paths && !push_dir(dir)) {
 454                 rsyserr(FERROR, errno, "push_dir#3 %s failed",
 455                         full_fname(dir));
 456                 exit_cleanup(RERR_FILESELECT);
 457         }
 458         argc--;
 459         argv++;
 460
 461         if (strcmp(dir,".")) {
 462                 int l = strlen(dir);
 463                 if (strcmp(dir,"/") == 0)
 464                         l = 0;
 465                 for (i = 0; i < argc; i++)
 466                         argv[i] += l+1;
 467         }
 468
 469         if (argc == 0 && (recurse || list_only)) {
 470                 argc = 1;
 471                 argv--;
 472                 argv[0] = ".";
 473         }
 474
 475         flist = send_file_list(f_out,argc,argv);
 476         if (!flist || flist->count == 0) {
 477                 exit_cleanup(0);
 478         }
 479
 480         io_start_buffering_in();
 481         io_start_buffering_out();
 482
 483         send_files(flist,f_out,f_in);
 484         io_flush(FULL_FLUSH);
 485         report(f_out);
 486         if (protocol_version >= 24) {
 487                 /* final goodbye message */
 488                 read_int(f_in);
 489         }
 490         io_flush(FULL_FLUSH);
 491         exit_cleanup(0);
 492 }
 493
 494
 495 static int do_recv(int f_in,int f_out,struct file_list *flist,char *local_name)
 496 {
 497         int pid;
 498         int status = 0;
 499         int error_pipe[2], name_pipe[2];
 500         BOOL need_name_pipe = (basis_dir[0] || partial_dir || fuzzy_basis)
 501                             && !dry_run;
 502
 503         /* The receiving side mustn't obey this, or an existing symlink that
 504          * points to an identical file won't be replaced by the referent. */
 505         copy_links = 0;
 506
 507         if (preserve_hard_links)
 508                 init_hard_links(flist);
 509
 510         if (delete_before && !local_name && flist->count > 0) {
 511                 /* Moved here from recv_files() to prevent a race condition */
 512                 delete_files(flist);
 513         }
 514
 515         if (fd_pair(error_pipe) < 0
 516             || (need_name_pipe && fd_pair(name_pipe) < 0)) {
 517                 rsyserr(FERROR, errno, "pipe failed in do_recv");
 518                 exit_cleanup(RERR_IPC);
 519         }
 520
 521         io_flush(NORMAL_FLUSH);
 522
 523         if ((pid = do_fork()) == -1) {
 524                 rsyserr(FERROR, errno, "fork failed in do_recv");
 525                 exit_cleanup(RERR_IPC);
 526         }
 527
 528         if (pid == 0) {
 529                 close(error_pipe[0]);
 530                 if (need_name_pipe) {
 531                         close(name_pipe[1]);
 532                         set_blocking(name_pipe[0]);
 533                 } else
 534                         name_pipe[0] = -1;
 535                 if (f_in != f_out)
 536                         close(f_out);
 537
 538                 /* we can't let two processes write to the socket at one time */
 539                 close_multiplexing_out();
 540
 541                 /* set place to send errors */
 542                 set_msg_fd_out(error_pipe[1]);
 543
 544                 recv_files(f_in, flist, local_name, name_pipe[0]);
 545                 io_flush(FULL_FLUSH);
 546                 report(f_in);
 547
 548                 send_msg(MSG_DONE, "", 0);
 549                 io_flush(FULL_FLUSH);
 550                 /* finally we go to sleep until our parent kills us
 551                  * with a USR2 signal. We sleep for a short time as on
 552                  * some OSes a signal won't interrupt a sleep! */
 553                 while (1)
 554                         msleep(20);
 555         }
 556
 557         am_generator = 1;
 558         close_multiplexing_in();
 559         if (write_batch)
 560                 stop_write_batch();
 561
 562         close(error_pipe[1]);
 563         if (need_name_pipe) {
 564                 close(name_pipe[0]);
 565                 set_nonblocking(name_pipe[1]);
 566         } else
 567                 name_pipe[1] = -1;
 568         if (f_in != f_out)
 569                 close(f_in);
 570
 571         io_start_buffering_out();
 572
 573         set_msg_fd_in(error_pipe[0]);
 574
 575         generate_files(f_out, flist, local_name, name_pipe[1]);
 576
 577         report(-1);
 578         io_flush(FULL_FLUSH);
 579         if (protocol_version >= 24) {
 580                 /* send a final goodbye message */
 581                 write_int(f_out, -1);
 582         }
 583         io_flush(FULL_FLUSH);
 584
 585         set_msg_fd_in(-1);
 586         kill(pid, SIGUSR2);
 587         wait_process(pid, &status);
 588         return status;
 589 }
 590
 591
 592 static void do_server_recv(int f_in, int f_out, int argc,char *argv[])
 593 {
 594         int status;
 595         struct file_list *flist;
 596         char *local_name = NULL;
 597         char *dir = NULL;
 598         int save_verbose = verbose;
 599
 600         if (filesfrom_fd >= 0) {
 601                 /* We can't mix messages with files-from data on the socket,
 602                  * so temporarily turn off verbose messages. */
 603                 verbose = 0;
 604         }
 605
 606         if (verbose > 2) {
 607                 rprintf(FINFO, "server_recv(%d) starting pid=%ld\n",
 608                         argc, (long)getpid());
 609         }
 610
 611         if (am_daemon && lp_read_only(module_id)) {
 612                 rprintf(FERROR,"ERROR: module is read only\n");
 613                 exit_cleanup(RERR_SYNTAX);
 614                 return;
 615         }
 616
 617
 618         if (argc > 0) {
 619                 dir = argv[0];
 620                 argc--;
 621                 argv++;
 622                 if (!am_daemon && !push_dir(dir)) {
 623                         rsyserr(FERROR, errno, "push_dir#4 %s failed",
 624                                 full_fname(dir));
 625                         exit_cleanup(RERR_FILESELECT);
 626                 }
 627         }
 628
 629         io_start_buffering_in();
 630         recv_filter_list(f_in);
 631
 632         if (filesfrom_fd >= 0) {
 633                 /* We need to send the files-from names to the sender at the
 634                  * same time that we receive the file-list from them, so we
 635                  * need the IO routines to automatically write out the names
 636                  * onto our f_out socket as we read the file-list.  This
 637                  * avoids both deadlock and extra delays/buffers. */
 638                 io_set_filesfrom_fds(filesfrom_fd, f_out);
 639                 filesfrom_fd = -1;
 640         }
 641
 642         flist = recv_file_list(f_in);
 643         verbose = save_verbose;
 644         if (!flist) {
 645                 rprintf(FERROR,"server_recv: recv_file_list error\n");
 646                 exit_cleanup(RERR_FILESELECT);
 647         }
 648
 649         if (argc > 0) {
 650                 if (strcmp(dir,".")) {
 651                         argv[0] += strlen(dir);
 652                         if (argv[0][0] == '/')
 653                                 argv[0]++;
 654                 }
 655                 local_name = get_local_name(flist,argv[0]);
 656         }
 657
 658         status = do_recv(f_in,f_out,flist,local_name);
 659         exit_cleanup(status);
 660 }
 661
 662
 663 int child_main(int argc, char *argv[])
 664 {
 665         start_server(STDIN_FILENO, STDOUT_FILENO, argc, argv);
 666         return 0;
 667 }
 668
 669
 670 void start_server(int f_in, int f_out, int argc, char *argv[])
 671 {
 672         set_nonblocking(f_in);
 673         set_nonblocking(f_out);
 674
 675         io_set_sock_fds(f_in, f_out);
 676         setup_protocol(f_out, f_in);
 677
 678         if (protocol_version >= 23)
 679                 io_start_multiplex_out();
 680
 681         if (am_sender) {
 682                 keep_dirlinks = 0; /* Must be disabled on the sender. */
 683                 if (need_messages_from_generator)
 684                         io_start_multiplex_in();
 685
 686                 recv_filter_list(f_in);
 687                 do_server_sender(f_in, f_out, argc, argv);
 688         } else {
 689                 do_server_recv(f_in, f_out, argc, argv);
 690         }
 691         exit_cleanup(0);
 692 }
 693
 694
 695 /*
 696  * This is called once the connection has been negotiated.  It is used
 697  * for rsyncd, remote-shell, and local connections.
 698  */
 699 int client_run(int f_in, int f_out, pid_t pid, int argc, char *argv[])
 700 {
 701         struct file_list *flist = NULL;
 702         int status = 0, status2 = 0;
 703         char *local_name = NULL;
 704
 705         cleanup_child_pid = pid;
 706         if (!read_batch) {
 707                 set_nonblocking(f_in);
 708                 set_nonblocking(f_out);
 709         }
 710
 711         io_set_sock_fds(f_in, f_out);
 712         setup_protocol(f_out,f_in);
 713
 714         if (protocol_version >= 23 && !read_batch)
 715                 io_start_multiplex_in();
 716
 717         /* We set our stderr file handle to blocking because ssh might have
 718          * set it to non-blocking.  This can be particularly troublesome if
 719          * stderr is a clone of stdout, because ssh would have set our stdout
 720          * to non-blocking at the same time (which can easily cause us to lose
 721          * output from our print statements).  This kluge shouldn't cause ssh
 722          * any problems for how we use it.  Note also that we delayed setting
 723          * this until after the above protocol setup so that we know for sure
 724          * that ssh is done twiddling its file descriptors.  */
 725         set_blocking(STDERR_FILENO);
 726
 727         if (am_sender) {
 728                 keep_dirlinks = 0; /* Must be disabled on the sender. */
 729                 io_start_buffering_out();
 730                 if (!remote_filesfrom_file)
 731                         set_msg_fd_in(f_in);
 732                 send_filter_list(f_out);
 733                 if (remote_filesfrom_file)
 734                         filesfrom_fd = f_in;
 735
 736                 if (write_batch)
 737                         start_write_batch(f_out);
 738                 if (!read_batch) /* don't write to pipe */
 739                         flist = send_file_list(f_out,argc,argv);
 740                 set_msg_fd_in(-1);
 741                 if (verbose > 3)
 742                         rprintf(FINFO,"file list sent\n");
 743
 744                 io_flush(NORMAL_FLUSH);
 745                 send_files(flist,f_out,f_in);
 746                 io_flush(FULL_FLUSH);
 747                 if (protocol_version >= 24) {
 748                         /* final goodbye message */
 749                         read_int(f_in);
 750                 }
 751                 if (pid != -1) {
 752                         if (verbose > 3)
 753                                 rprintf(FINFO,"client_run waiting on %d\n", (int) pid);
 754                         io_flush(FULL_FLUSH);
 755                         wait_process(pid, &status);
 756                 }
 757                 report(-1);
 758                 io_flush(FULL_FLUSH);
 759                 exit_cleanup(status);
 760         }
 761
 762         if (need_messages_from_generator && !read_batch)
 763                 io_start_multiplex_out();
 764
 765         if (argc == 0)
 766                 list_only |= 1;
 767
 768         send_filter_list(read_batch ? -1 : f_out);
 769
 770         if (filesfrom_fd >= 0) {
 771                 io_set_filesfrom_fds(filesfrom_fd, f_out);
 772                 filesfrom_fd = -1;
 773         }
 774
 775         if (write_batch)
 776                 start_write_batch(f_in);
 777         flist = recv_file_list(f_in);
 778         if (!flist || flist->count == 0) {
 779                 rprintf(FINFO, "client: nothing to do: "
 780                         "perhaps you need to specify some filenames or "
 781                         "the --recursive option?\n");
 782                 exit_cleanup(0);
 783         }
 784
 785         local_name = get_local_name(flist,argv[0]);
 786
 787         status2 = do_recv(f_in,f_out,flist,local_name);
 788
 789         if (pid != -1) {
 790                 if (verbose > 3)
 791                         rprintf(FINFO,"client_run2 waiting on %d\n", (int) pid);
 792                 io_flush(FULL_FLUSH);
 793                 wait_process(pid, &status);
 794         }
 795
 796         return MAX(status, status2);
 797 }
 798
 799 static int copy_argv (char *argv[])
 800 {
 801         int i;
 802
 803         for (i = 0; argv[i]; i++) {
 804                 if (!(argv[i] = strdup(argv[i]))) {
 805                         rprintf (FERROR, "out of memory at %s(%d)\n",
 806                                  __FILE__, __LINE__);
 807                         return RERR_MALLOC;
 808                 }
 809         }
 810
 811         return 0;
 812 }
 813
 814
 815 /**
 816  * Start a client for either type of remote connection.  Work out
 817  * whether the arguments request a remote shell or rsyncd connection,
 818  * and call the appropriate connection function, then run_client.
 819  *
 820  * Calls either start_socket_client (for sockets) or do_cmd and
 821  * client_run (for ssh).
 822  **/
 823 static int start_client(int argc, char *argv[])
 824 {
 825         char *p;
 826         char *shell_machine = NULL;
 827         char *shell_path = NULL;
 828         char *shell_user = NULL;
 829         int ret;
 830         pid_t pid;
 831         int f_in,f_out;
 832         int rc;
 833
 834         /* Don't clobber argv[] so that ps(1) can still show the right
 835          * command line. */
 836         if ((rc = copy_argv(argv)))
 837                 return rc;
 838
 839         /* rsync:// always uses rsync server over direct socket connection */
 840         if (strncasecmp(URL_PREFIX, argv[0], strlen(URL_PREFIX)) == 0
 841             && !read_batch) {
 842                 char *host, *path;
 843
 844                 host = argv[0] + strlen(URL_PREFIX);
 845                 p = strchr(host,'/');
 846                 if (p) {
 847                         *p = '\0';
 848                         path = p+1;
 849                 } else
 850                         path = "";
 851                 if (*host == '[' && (p = strchr(host, ']')) != NULL) {
 852                         host++;
 853                         *p++ = '\0';
 854                         if (*p != ':')
 855                                 p = NULL;
 856                 } else
 857                         p = strchr(host, ':');
 858                 if (p) {
 859                         rsync_port = atoi(p+1);
 860                         *p = '\0';
 861                 }
 862                 return start_socket_client(host, path, argc-1, argv+1);
 863         }
 864
 865         if (!read_batch) { /* for read_batch, NO source is specified */
 866                 p = find_colon(argv[0]);
 867                 if (p) { /* source is remote */
 868                         if (remote_filesfrom_file
 869                          && remote_filesfrom_file != files_from + 1
 870                          && strncmp(files_from, argv[0], p-argv[0]+1) != 0) {
 871                                 rprintf(FERROR,
 872                                         "--files-from hostname is not the same as the transfer hostname\n");
 873                                 exit_cleanup(RERR_SYNTAX);
 874                         }
 875                         if (p[1] == ':') { /* double colon */
 876                                 *p = 0;
 877                                 if (!shell_cmd) {
 878                                         return start_socket_client(argv[0], p+2,
 879                                                                    argc-1, argv+1);
 880                                 }
 881                                 p++;
 882                                 daemon_over_rsh = 1;
 883                         }
 884
 885                         if (argc < 1) { /* destination required */
 886                                 usage(FERROR);
 887                                 exit_cleanup(RERR_SYNTAX);
 888                         }
 889
 890                         am_sender = 0;
 891                         *p = 0;
 892                         shell_machine = argv[0];
 893                         shell_path = p+1;
 894                         argv++;
 895                 } else { /* source is local */
 896                         am_sender = 1;
 897
 898                         /* rsync:// destination uses rsync server over direct socket */
 899                         if (strncasecmp(URL_PREFIX, argv[argc-1], strlen(URL_PREFIX)) == 0) {
 900                                 char *host, *path;
 901
 902                                 host = argv[argc-1] + strlen(URL_PREFIX);
 903                                 p = strchr(host,'/');
 904                                 if (p) {
 905                                         *p = '\0';
 906                                         path = p+1;
 907                                 } else
 908                                         path = "";
 909                                 if (*host == '[' && (p = strchr(host, ']')) != NULL) {
 910                                         host++;
 911                                         *p++ = '\0';
 912                                         if (*p != ':')
 913                                                 p = NULL;
 914                                 } else
 915                                         p = strchr(host, ':');
 916                                 if (p) {
 917                                         rsync_port = atoi(p+1);
 918                                         *p = '\0';
 919                                 }
 920                                 return start_socket_client(host, path, argc-1, argv);
 921                         }
 922
 923                         p = find_colon(argv[argc-1]); /* look in dest arg */
 924                         if (p && remote_filesfrom_file
 925                          && remote_filesfrom_file != files_from + 1
 926                          && strncmp(files_from, argv[argc-1], p-argv[argc-1]+1) != 0) {
 927                                 rprintf(FERROR,
 928                                         "--files-from hostname is not the same as the transfer hostname\n");
 929                                 exit_cleanup(RERR_SYNTAX);
 930                         }
 931                         if (!p) { /* no colon found, so src & dest are local */
 932                                 local_server = 1;
 933                                 if (remote_filesfrom_file) {
 934                                         rprintf(FERROR,
 935                                                 "--files-from cannot be remote when the transfer is local\n");
 936                                         exit_cleanup(RERR_SYNTAX);
 937                                 }
 938                         } else if (p[1] == ':') { /* double colon */
 939                                 *p = 0;
 940                                 if (!shell_cmd) {
 941                                         return start_socket_client(argv[argc-1], p+2,
 942                                                                    argc-1, argv);
 943                                 }
 944                                 p++;
 945                                 daemon_over_rsh = 1;
 946                         }
 947
 948                         if (argc < 2) {
 949                                 usage(FERROR);
 950                                 exit_cleanup(RERR_SYNTAX);
 951                         }
 952
 953                         if (local_server) {
 954                                 shell_machine = NULL;
 955                                 shell_path = argv[argc-1];
 956                         } else {
 957                                 *p = 0;
 958                                 shell_machine = argv[argc-1];
 959                                 shell_path = p+1;
 960                         }
 961                 }
 962                 argc--;
 963         } else {  /* read_batch */
 964                 local_server = 1;
 965                 shell_path = argv[argc-1];
 966                 if (find_colon(shell_path)) {
 967                         rprintf(FERROR, "remote destination is not allowed with --read-batch\n");
 968                         exit_cleanup(RERR_SYNTAX);
 969                 }
 970         }
 971
 972         if (shell_machine) {
 973                 p = strrchr(shell_machine,'@');
 974                 if (p) {
 975                         *p = 0;
 976                         shell_user = shell_machine;
 977                         shell_machine = p+1;
 978                 }
 979         }
 980
 981         if (verbose > 3) {
 982                 rprintf(FINFO,"cmd=%s machine=%s user=%s path=%s\n",
 983                         shell_cmd ? safe_fname(shell_cmd) : "",
 984                         shell_machine ? safe_fname(shell_machine) : "",
 985                         shell_user ? safe_fname(shell_user) : "",
 986                         shell_path ? safe_fname(shell_path) : "");
 987         }
 988
 989         /* for remote source, only single dest arg can remain ... */
 990         if (!am_sender && argc > 1) {
 991                 usage(FERROR);
 992                 exit_cleanup(RERR_SYNTAX);
 993         }
 994
 995         /* ... or no dest at all */
 996         if (!am_sender && argc == 0)
 997                 list_only |= 1;
 998
 999         pid = do_cmd(shell_cmd,shell_machine,shell_user,shell_path,
1000                      &f_in,&f_out);
1001
1002         /* if we're running an rsync server on the remote host over a
1003          * remote shell command, we need to do the RSYNCD protocol first */
1004         if (daemon_over_rsh) {
1005                 int tmpret;
1006                 tmpret = start_inband_exchange(shell_user, shell_path,
1007                                                f_in, f_out, argc);
1008                 if (tmpret < 0)
1009                         return tmpret;
1010         }
1011
1012         ret = client_run(f_in, f_out, pid, argc, argv);
1013
1014         fflush(stdout);
1015         fflush(stderr);
1016
1017         return ret;
1018 }
1019
1020
1021 static RETSIGTYPE sigusr1_handler(UNUSED(int val))
1022 {
1023         exit_cleanup(RERR_SIGNAL);
1024 }
1025
1026 static RETSIGTYPE sigusr2_handler(UNUSED(int val))
1027 {
1028         if (log_got_error) _exit(RERR_PARTIAL);
1029         _exit(0);
1030 }
1031
1032 static RETSIGTYPE sigchld_handler(UNUSED(int val))
1033 {
1034 #ifdef WNOHANG
1035         int cnt, status;
1036         pid_t pid;
1037         /* An empty waitpid() loop was put here by Tridge and we could never
1038          * get him to explain why he put it in, so rather than taking it
1039          * out we're instead saving the child exit statuses for later use.
1040          * The waitpid() loop presumably eliminates all possibility of leaving
1041          * zombie children, maybe that's why he did it.
1042          */
1043         while ((pid = waitpid(-1, &status, WNOHANG)) > 0) {
1044                 /* save the child's exit status */
1045                 for (cnt = 0; cnt < MAXCHILDPROCS; cnt++) {
1046                         if (pid_stat_table[cnt].pid == 0) {
1047                                 pid_stat_table[cnt].pid = pid;
1048                                 pid_stat_table[cnt].status = status;
1049                                 break;
1050                         }
1051                 }
1052         }
1053 #endif
1054 }
1055
1056
1057 /**
1058  * This routine catches signals and tries to send them to gdb.
1059  *
1060  * Because it's called from inside a signal handler it ought not to
1061  * use too many library routines.
1062  *
1063  * @todo Perhaps use "screen -X" instead/as well, to help people
1064  * debugging without easy access to X.  Perhaps use an environment
1065  * variable, or just call a script?
1066  *
1067  * @todo The /proc/ magic probably only works on Linux (and
1068  * Solaris?)  Can we be more portable?
1069  **/
1070 #ifdef MAINTAINER_MODE
1071 const char *get_panic_action(void)
1072 {
1073         const char *cmd_fmt = getenv("RSYNC_PANIC_ACTION");
1074
1075         if (cmd_fmt)
1076                 return cmd_fmt;
1077         else
1078                 return "xterm -display :0 -T Panic -n Panic "
1079                         "-e gdb /proc/%d/exe %d";
1080 }
1081
1082
1083 /**
1084  * Handle a fatal signal by launching a debugger, controlled by $RSYNC_PANIC_ACTION.
1085  *
1086  * This signal handler is only installed if we were configured with
1087  * --enable-maintainer-mode.  Perhaps it should always be on and we
1088  * should just look at the environment variable, but I'm a bit leery
1089  * of a signal sending us into a busy loop.
1090  **/
1091 static RETSIGTYPE rsync_panic_handler(UNUSED(int whatsig))
1092 {
1093         char cmd_buf[300];
1094         int ret;
1095
1096         sprintf(cmd_buf, get_panic_action(),
1097                 getpid(), getpid());
1098
1099         /* Unless we failed to execute gdb, we allow the process to
1100          * continue.  I'm not sure if that's right. */
1101         ret = system(cmd_buf);
1102         if (ret)
1103                 _exit(ret);
1104 }
1105 #endif
1106
1107
1108 int main(int argc,char *argv[])
1109 {
1110         int ret;
1111         int orig_argc = argc;
1112         char **orig_argv = argv;
1113
1114         signal(SIGUSR1, sigusr1_handler);
1115         signal(SIGUSR2, sigusr2_handler);
1116         signal(SIGCHLD, sigchld_handler);
1117 #ifdef MAINTAINER_MODE
1118         signal(SIGSEGV, rsync_panic_handler);
1119         signal(SIGFPE, rsync_panic_handler);
1120         signal(SIGABRT, rsync_panic_handler);
1121         signal(SIGBUS, rsync_panic_handler);
1122 #endif /* def MAINTAINER_MODE */
1123
1124         starttime = time(NULL);
1125         am_root = (MY_UID() == 0);
1126
1127         memset(&stats, 0, sizeof(stats));
1128
1129         if (argc < 2) {
1130                 usage(FERROR);
1131                 exit_cleanup(RERR_SYNTAX);
1132         }
1133
1134         /* we set a 0 umask so that correct file permissions can be
1135          * carried across */
1136         orig_umask = (int)umask(0);
1137
1138         if (!parse_arguments(&argc, (const char ***) &argv, 1)) {
1139                 /* FIXME: We ought to call the same error-handling
1140                  * code here, rather than relying on getopt. */
1141                 option_error();
1142                 exit_cleanup(RERR_SYNTAX);
1143         }
1144
1145         signal(SIGINT,SIGNAL_CAST sig_int);
1146         signal(SIGHUP,SIGNAL_CAST sig_int);
1147         signal(SIGTERM,SIGNAL_CAST sig_int);
1148
1149         /* Ignore SIGPIPE; we consistently check error codes and will
1150          * see the EPIPE. */
1151         signal(SIGPIPE, SIG_IGN);
1152
1153         /* Initialize push_dir here because on some old systems getcwd
1154          * (implemented by forking "pwd" and reading its output) doesn't
1155          * work when there are other child processes.  Also, on all systems
1156          * that implement getcwd that way "pwd" can't be found after chroot. */
1157         push_dir(NULL);
1158
1159         init_flist();
1160
1161         if (write_batch || read_batch) {
1162                 if (write_batch)
1163                         write_batch_shell_file(orig_argc, orig_argv, argc);
1164
1165                 if (read_batch && strcmp(batch_name, "-") == 0)
1166                         batch_fd = STDIN_FILENO;
1167                 else {
1168                         batch_fd = do_open(batch_name,
1169                                    write_batch ? O_WRONLY | O_CREAT | O_TRUNC
1170                                    : O_RDONLY, S_IRUSR | S_IWUSR);
1171                 }
1172                 if (batch_fd < 0) {
1173                         rsyserr(FERROR, errno, "Batch file %s open error",
1174                                 full_fname(batch_name));
1175                         exit_cleanup(RERR_FILEIO);
1176                 }
1177                 if (read_batch)
1178                         read_stream_flags(batch_fd);
1179         }
1180
1181         if (am_daemon && !am_server)
1182                 return daemon_main();
1183
1184         if (argc < 1) {
1185                 usage(FERROR);
1186                 exit_cleanup(RERR_SYNTAX);
1187         }
1188
1189         if (am_server) {
1190                 set_nonblocking(STDIN_FILENO);
1191                 set_nonblocking(STDOUT_FILENO);
1192                 if (am_daemon)
1193                         return start_daemon(STDIN_FILENO, STDOUT_FILENO);
1194                 start_server(STDIN_FILENO, STDOUT_FILENO, argc, argv);
1195         }
1196
1197         ret = start_client(argc, argv);
1198         if (ret == -1)
1199                 exit_cleanup(RERR_STARTCLIENT);
1200         else
1201                 exit_cleanup(ret);
1202
1203         return ret;
1204 }