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