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