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