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_after;
  38 extern int delete_excluded;
  39 extern int daemon_over_rsh;
  40 extern int do_stats;
  41 extern int dry_run;
  42 extern int list_only;
  43 extern int local_server;
  44 extern int log_got_error;
  45 extern int module_id;
  46 extern int orig_umask;
  47 extern int copy_links;
  48 extern int keep_dirlinks;
  49 extern int preserve_hard_links;
  50 extern int protocol_version;
  51 extern int recurse;
  52 extern int relative_paths;
  53 extern int rsync_port;
  54 extern int whole_file;
  55 extern int read_batch;
  56 extern int write_batch;
  57 extern int batch_fd;
  58 extern int batch_gen_fd;
  59 extern int filesfrom_fd;
  60 extern pid_t cleanup_child_pid;
  61 extern char *files_from;
  62 extern char *remote_filesfrom_file;
  63 extern char *partial_dir;
  64 extern char *basis_dir[];
  65 extern char *rsync_path;
  66 extern char *shell_cmd;
  67 extern char *batch_name;
  68 extern struct filter_list_struct filter_list;
  69
  70 /* There's probably never more than at most 2 outstanding child processes,
  71  * but set it higher, just in case. */
  72 #define MAXCHILDPROCS 5
  73
  74 struct pid_status {
  75         pid_t pid;
  76         int   status;
  77 } pid_stat_table[MAXCHILDPROCS];
  78
  79 static void show_malloc_stats(void);
  80
  81 /****************************************************************************
  82 wait for a process to exit, calling io_flush while waiting
  83 ****************************************************************************/
  84 void wait_process(pid_t pid, int *status)
  85 {
  86         pid_t waited_pid;
  87         int cnt;
  88
  89         while ((waited_pid = waitpid(pid, status, WNOHANG)) == 0) {
  90                 msleep(20);
  91                 io_flush(FULL_FLUSH);
  92         }
  93
  94         if (waited_pid == -1 && errno == ECHILD) {
  95                 /* status of requested child no longer available.
  96                  * check to see if it was processed by the sigchld_handler.
  97                  */
  98                 for (cnt = 0;  cnt < MAXCHILDPROCS; cnt++) {
  99                         if (pid == pid_stat_table[cnt].pid) {
 100                                 *status = pid_stat_table[cnt].status;
 101                                 pid_stat_table[cnt].pid = 0;
 102                                 break;
 103                         }
 104                 }
 105         }
 106
 107         /* TODO: If the child exited on a signal, then log an
 108          * appropriate error message.  Perhaps we should also accept a
 109          * message describing the purpose of the child.  Also indicate
 110          * this to the caller so that thhey know something went
 111          * wrong.  */
 112         *status = WEXITSTATUS(*status);
 113 }
 114
 115 /* This function gets called from all 3 processes.  We want the client side
 116  * to actually output the text, but the sender is the only process that has
 117  * all the stats we need.  So, if we're a client sender, we do the report.
 118  * If we're a server sender, we write the stats on the supplied fd.  If
 119  * we're the client receiver we read the stats from the supplied fd and do
 120  * the report.  All processes might also generate a set of debug stats, if
 121  * the verbose level is high enough (this is the only thing that the
 122  * generator process and the server receiver ever do here). */
 123 static void report(int f)
 124 {
 125         /* Cache two stats because the read/write code can change it. */
 126         int64 total_read = stats.total_read;
 127         int64 total_written = stats.total_written;
 128         time_t t = time(NULL);
 129
 130         if (do_stats && verbose > 1) {
 131                 /* These come out from every process */
 132                 show_malloc_stats();
 133                 show_flist_stats();
 134         }
 135
 136         if (am_generator)
 137                 return;
 138
 139         if (am_daemon) {
 140                 log_exit(0, __FILE__, __LINE__);
 141                 if (f == -1 || !am_sender)
 142                         return;
 143         }
 144
 145         if (am_server) {
 146                 if (am_sender) {
 147                         write_longint(f, total_read);
 148                         write_longint(f, total_written);
 149                         write_longint(f, stats.total_size);
 150                         if (protocol_version >= 29) {
 151                                 write_longint(f, stats.flist_buildtime);
 152                                 write_longint(f, stats.flist_xfertime);
 153                         }
 154                 }
 155                 return;
 156         }
 157
 158         /* this is the client */
 159
 160         if (!am_sender) {
 161                 /* Read the first two in opposite order because the meaning of
 162                  * read/write swaps when switching from sender to receiver. */
 163                 total_written = read_longint(f);
 164                 total_read = read_longint(f);
 165                 stats.total_size = read_longint(f);
 166                 if (protocol_version >= 29) {
 167                         stats.flist_buildtime = read_longint(f);
 168                         stats.flist_xfertime = read_longint(f);
 169                 }
 170         } else if (write_batch) {
 171                 /* The --read-batch process is going to be a client
 172                  * receiver, so we need to give it the stats. */
 173                 write_longint(batch_fd, total_read);
 174                 write_longint(batch_fd, total_written);
 175                 write_longint(batch_fd, stats.total_size);
 176                 if (protocol_version >= 29) {
 177                         write_longint(batch_fd, stats.flist_buildtime);
 178                         write_longint(batch_fd, stats.flist_xfertime);
 179                 }
 180         }
 181
 182         if (do_stats) {
 183                 rprintf(FINFO,"\nNumber of files: %d\n", stats.num_files);
 184                 rprintf(FINFO,"Number of files transferred: %d\n",
 185                         stats.num_transferred_files);
 186                 rprintf(FINFO,"Total file size: %.0f bytes\n",
 187                         (double)stats.total_size);
 188                 rprintf(FINFO,"Total transferred file size: %.0f bytes\n",
 189                         (double)stats.total_transferred_size);
 190                 rprintf(FINFO,"Literal data: %.0f bytes\n",
 191                         (double)stats.literal_data);
 192                 rprintf(FINFO,"Matched data: %.0f bytes\n",
 193                         (double)stats.matched_data);
 194                 rprintf(FINFO,"File list size: %d\n", stats.flist_size);
 195                 if (stats.flist_buildtime) {
 196                         rprintf(FINFO,
 197                                 "File list generation time: %.3f seconds\n",
 198                                 (double)stats.flist_buildtime / 1000);
 199                         rprintf(FINFO,
 200                                 "File list transfer time: %.3f seconds\n",
 201                                 (double)stats.flist_xfertime / 1000);
 202                 }
 203                 rprintf(FINFO,"Total bytes sent: %.0f\n",
 204                         (double)total_written);
 205                 rprintf(FINFO,"Total bytes received: %.0f\n",
 206                         (double)total_read);
 207         }
 208
 209         if (verbose || do_stats) {
 210                 rprintf(FINFO,
 211                         "\nsent %.0f bytes  received %.0f bytes  %.2f bytes/sec\n",
 212                         (double)total_written, (double)total_read,
 213                         (total_written + total_read)/(0.5 + (t - starttime)));
 214                 rprintf(FINFO, "total size is %.0f  speedup is %.2f\n",
 215                         (double)stats.total_size,
 216                         (double)stats.total_size / (total_written+total_read));
 217         }
 218
 219         fflush(stdout);
 220         fflush(stderr);
 221 }
 222
 223
 224 /**
 225  * If our C library can get malloc statistics, then show them to FINFO
 226  **/
 227 static void show_malloc_stats(void)
 228 {
 229 #if HAVE_MALLINFO
 230         struct mallinfo mi;
 231
 232         mi = mallinfo();
 233
 234         rprintf(FINFO, "\n" RSYNC_NAME "[%d] (%s%s%s) heap statistics:\n",
 235                 getpid(), am_server ? "server " : "",
 236                 am_daemon ? "daemon " : "", who_am_i());
 237         rprintf(FINFO, "  arena:     %10ld   (bytes from sbrk)\n",
 238                 (long)mi.arena);
 239         rprintf(FINFO, "  ordblks:   %10ld   (chunks not in use)\n",
 240                 (long)mi.ordblks);
 241         rprintf(FINFO, "  smblks:    %10ld\n",
 242                 (long)mi.smblks);
 243         rprintf(FINFO, "  hblks:     %10ld   (chunks from mmap)\n",
 244                 (long)mi.hblks);
 245         rprintf(FINFO, "  hblkhd:    %10ld   (bytes from mmap)\n",
 246                 (long)mi.hblkhd);
 247         rprintf(FINFO, "  allmem:    %10ld   (bytes from sbrk + mmap)\n",
 248                 (long)mi.arena + mi.hblkhd);
 249         rprintf(FINFO, "  usmblks:   %10ld\n",
 250                 (long)mi.usmblks);
 251         rprintf(FINFO, "  fsmblks:   %10ld\n",
 252                 (long)mi.fsmblks);
 253         rprintf(FINFO, "  uordblks:  %10ld   (bytes used)\n",
 254                 (long)mi.uordblks);
 255         rprintf(FINFO, "  fordblks:  %10ld   (bytes free)\n",
 256                 (long)mi.fordblks);
 257         rprintf(FINFO, "  keepcost:  %10ld   (bytes in releasable chunk)\n",
 258                 (long)mi.keepcost);
 259 #endif /* HAVE_MALLINFO */
 260 }
 261
 262
 263 /* Start the remote shell.   cmd may be NULL to use the default. */
 264 static pid_t do_cmd(char *cmd, char *machine, char *user, char *path,
 265                     int *f_in, int *f_out)
 266 {
 267         int i, argc = 0;
 268         char *args[MAX_ARGS];
 269         pid_t ret;
 270         char *tok, *dir = NULL;
 271         int dash_l_set = 0;
 272
 273         if (!read_batch && !local_server) {
 274                 char *rsh_env = getenv(RSYNC_RSH_ENV);
 275                 if (!cmd)
 276                         cmd = rsh_env;
 277                 if (!cmd)
 278                         cmd = RSYNC_RSH;
 279                 cmd = strdup(cmd);
 280                 if (!cmd)
 281                         goto oom;
 282
 283                 for (tok = strtok(cmd, " "); tok; tok = strtok(NULL, " ")) {
 284                         /* Comparison leaves rooms for server_options(). */
 285                         if (argc >= MAX_ARGS - 100) {
 286                                 rprintf(FERROR, "internal: args[] overflowed in do_cmd()\n");
 287                                 exit_cleanup(RERR_SYNTAX);
 288                         }
 289                         args[argc++] = tok;
 290                 }
 291
 292                 /* check to see if we've already been given '-l user' in
 293                  * the remote-shell command */
 294                 for (i = 0; i < argc-1; i++) {
 295                         if (!strcmp(args[i], "-l") && args[i+1][0] != '-')
 296                                 dash_l_set = 1;
 297                 }
 298
 299 #if HAVE_REMSH
 300                 /* remsh (on HPUX) takes the arguments the other way around */
 301                 args[argc++] = machine;
 302                 if (user && !(daemon_over_rsh && dash_l_set)) {
 303                         args[argc++] = "-l";
 304                         args[argc++] = user;
 305                 }
 306 #else
 307                 if (user && !(daemon_over_rsh && dash_l_set)) {
 308                         args[argc++] = "-l";
 309                         args[argc++] = user;
 310                 }
 311                 args[argc++] = machine;
 312 #endif
 313
 314                 args[argc++] = rsync_path;
 315
 316                 if (blocking_io < 0) {
 317                         char *cp;
 318                         if ((cp = strrchr(cmd, '/')) != NULL)
 319                                 cp++;
 320                         else
 321                                 cp = cmd;
 322                         if (strcmp(cp, "rsh") == 0 || strcmp(cp, "remsh") == 0)
 323                                 blocking_io = 1;
 324                 }
 325
 326                 server_options(args,&argc);
 327
 328                 if (argc >= MAX_ARGS - 2) {
 329                         rprintf(FERROR, "internal: args[] overflowed in do_cmd()\n");
 330                         exit_cleanup(RERR_SYNTAX);
 331                 }
 332         }
 333
 334         args[argc++] = ".";
 335
 336         if (!daemon_over_rsh && path && *path)
 337                 args[argc++] = path;
 338
 339         args[argc] = NULL;
 340
 341         if (verbose > 3) {
 342                 rprintf(FINFO,"cmd=");
 343                 for (i = 0; i < argc; i++)
 344                         rprintf(FINFO,"%s ",args[i]);
 345                 rprintf(FINFO,"\n");
 346         }
 347
 348         if (read_batch) {
 349                 int from_gen_pipe[2];
 350                 if (fd_pair(from_gen_pipe) < 0) {
 351                         rsyserr(FERROR, errno, "pipe");
 352                         exit_cleanup(RERR_IPC);
 353                 }
 354                 batch_gen_fd = from_gen_pipe[0];
 355                 *f_out = from_gen_pipe[1];
 356                 *f_in = batch_fd;
 357                 ret = -1; /* no child pid */
 358         } else if (local_server) {
 359                 /* If the user didn't request --[no-]whole-file, force
 360                  * it on, but only if we're not batch processing. */
 361                 if (whole_file < 0 && !write_batch)
 362                         whole_file = 1;
 363                 ret = local_child(argc, args, f_in, f_out, child_main);
 364         } else
 365                 ret = piped_child(args,f_in,f_out);
 366
 367         if (dir)
 368                 free(dir);
 369
 370         return ret;
 371
 372 oom:
 373         out_of_memory("do_cmd");
 374         return 0; /* not reached */
 375 }
 376
 377
 378 static char *get_local_name(struct file_list *flist,char *name)
 379 {
 380         STRUCT_STAT st;
 381         int e;
 382
 383         if (verbose > 2)
 384                 rprintf(FINFO,"get_local_name count=%d %s\n",
 385                         flist->count, NS(name));
 386
 387         if (!name)
 388                 return NULL;
 389
 390         if (do_stat(name,&st) == 0) {
 391                 if (S_ISDIR(st.st_mode)) {
 392                         if (!push_dir(name)) {
 393                                 rsyserr(FERROR, errno, "push_dir#1 %s failed",
 394                                         full_fname(name));
 395                                 exit_cleanup(RERR_FILESELECT);
 396                         }
 397                         return NULL;
 398                 }
 399                 if (flist->count > 1) {
 400                         rprintf(FERROR,"ERROR: destination must be a directory when copying more than 1 file\n");
 401                         exit_cleanup(RERR_FILESELECT);
 402                 }
 403                 return name;
 404         }
 405
 406         if (flist->count <= 1 && ((e = strlen(name)) <= 1 || name[e-1] != '/'))
 407                 return name;
 408
 409         if (do_mkdir(name,0777 & ~orig_umask) != 0) {
 410                 rsyserr(FERROR, errno, "mkdir %s failed", full_fname(name));
 411                 exit_cleanup(RERR_FILEIO);
 412         }
 413         if (verbose > 0)
 414                 rprintf(FINFO, "created directory %s\n", name);
 415
 416         if (dry_run) {
 417                 dry_run++;
 418                 return NULL;
 419         }
 420
 421         if (!push_dir(name)) {
 422                 rsyserr(FERROR, errno, "push_dir#2 %s failed",
 423                         full_fname(name));
 424                 exit_cleanup(RERR_FILESELECT);
 425         }
 426
 427         return NULL;
 428 }
 429
 430
 431 static void do_server_sender(int f_in, int f_out, int argc,char *argv[])
 432 {
 433         int i;
 434         struct file_list *flist;
 435         char *dir = argv[0];
 436
 437         if (verbose > 2) {
 438                 rprintf(FINFO, "server_sender starting pid=%ld\n",
 439                         (long)getpid());
 440         }
 441
 442         if (am_daemon && lp_write_only(module_id)) {
 443                 rprintf(FERROR, "ERROR: module is write only\n");
 444                 exit_cleanup(RERR_SYNTAX);
 445                 return;
 446         }
 447
 448         if (!relative_paths && !push_dir(dir)) {
 449                 rsyserr(FERROR, errno, "push_dir#3 %s failed",
 450                         full_fname(dir));
 451                 exit_cleanup(RERR_FILESELECT);
 452         }
 453         argc--;
 454         argv++;
 455
 456         if (strcmp(dir,".")) {
 457                 int l = strlen(dir);
 458                 if (strcmp(dir,"/") == 0)
 459                         l = 0;
 460                 for (i = 0; i < argc; i++)
 461                         argv[i] += l+1;
 462         }
 463
 464         if (argc == 0 && (recurse || list_only)) {
 465                 argc = 1;
 466                 argv--;
 467                 argv[0] = ".";
 468         }
 469
 470         flist = send_file_list(f_out,argc,argv);
 471         if (!flist || flist->count == 0) {
 472                 exit_cleanup(0);
 473         }
 474
 475         io_start_buffering_in();
 476         io_start_buffering_out();
 477
 478         send_files(flist,f_out,f_in);
 479         io_flush(FULL_FLUSH);
 480         report(f_out);
 481         if (protocol_version >= 24) {
 482                 /* final goodbye message */
 483                 read_int(f_in);
 484         }
 485         io_flush(FULL_FLUSH);
 486         exit_cleanup(0);
 487 }
 488
 489
 490 static int do_recv(int f_in,int f_out,struct file_list *flist,char *local_name)
 491 {
 492         int pid;
 493         int status = 0;
 494         int error_pipe[2], name_pipe[2];
 495         BOOL need_name_pipe = (basis_dir[0] || partial_dir) && !dry_run;
 496
 497         /* The receiving side mustn't obey this, or an existing symlink that
 498          * points to an identical file won't be replaced by the referent. */
 499         copy_links = 0;
 500
 501         if (preserve_hard_links)
 502                 init_hard_links(flist);
 503
 504         if (delete_before) {
 505                 /* I moved this here from recv_files() to prevent a race condition */
 506                 if (recurse && !local_name && flist->count > 0)
 507                         delete_files(flist);
 508         }
 509
 510         if (fd_pair(error_pipe) < 0
 511             || (need_name_pipe && fd_pair(name_pipe) < 0)) {
 512                 rsyserr(FERROR, errno, "pipe failed in do_recv");
 513                 exit_cleanup(RERR_IPC);
 514         }
 515
 516         io_flush(NORMAL_FLUSH);
 517
 518         if ((pid = do_fork()) == -1) {
 519                 rsyserr(FERROR, errno, "fork failed in do_recv");
 520                 exit_cleanup(RERR_IPC);
 521         }
 522
 523         if (pid == 0) {
 524                 close(error_pipe[0]);
 525                 if (need_name_pipe) {
 526                         close(name_pipe[1]);
 527                         set_blocking(name_pipe[0]);
 528                 } else
 529                         name_pipe[0] = -1;
 530                 if (f_in != f_out)
 531                         close(f_out);
 532
 533                 /* we can't let two processes write to the socket at one time */
 534                 close_multiplexing_out();
 535
 536                 /* set place to send errors */
 537                 set_msg_fd_out(error_pipe[1]);
 538
 539                 recv_files(f_in, flist, local_name, name_pipe[0]);
 540                 io_flush(FULL_FLUSH);
 541                 report(f_in);
 542
 543                 send_msg(MSG_DONE, "", 0);
 544                 io_flush(FULL_FLUSH);
 545                 /* finally we go to sleep until our parent kills us
 546                  * with a USR2 signal. We sleep for a short time as on
 547                  * some OSes a signal won't interrupt a sleep! */
 548                 while (1)
 549                         msleep(20);
 550         }
 551
 552         am_generator = 1;
 553         close_multiplexing_in();
 554         if (write_batch)
 555                 stop_write_batch();
 556
 557         close(error_pipe[1]);
 558         if (need_name_pipe) {
 559                 close(name_pipe[0]);
 560                 set_nonblocking(name_pipe[1]);
 561         } else
 562                 name_pipe[1] = -1;
 563         if (f_in != f_out)
 564                 close(f_in);
 565
 566         io_start_buffering_out();
 567
 568         set_msg_fd_in(error_pipe[0]);
 569
 570         generate_files(f_out, flist, local_name, name_pipe[1]);
 571
 572         report(-1);
 573         io_flush(FULL_FLUSH);
 574         if (protocol_version >= 24) {
 575                 /* send a final goodbye message */
 576                 write_int(f_out, -1);
 577         }
 578         io_flush(FULL_FLUSH);
 579
 580         set_msg_fd_in(-1);
 581         kill(pid, SIGUSR2);
 582         wait_process(pid, &status);
 583         return status;
 584 }
 585
 586
 587 static void do_server_recv(int f_in, int f_out, int argc,char *argv[])
 588 {
 589         int status;
 590         struct file_list *flist;
 591         char *local_name = NULL;
 592         char *dir = NULL;
 593         int save_verbose = verbose;
 594
 595         if (filesfrom_fd >= 0) {
 596                 /* We can't mix messages with files-from data on the socket,
 597                  * so temporarily turn off verbose messages. */
 598                 verbose = 0;
 599         }
 600
 601         if (verbose > 2) {
 602                 rprintf(FINFO, "server_recv(%d) starting pid=%ld\n",
 603                         argc, (long)getpid());
 604         }
 605
 606         if (am_daemon && lp_read_only(module_id)) {
 607                 rprintf(FERROR,"ERROR: module is read only\n");
 608                 exit_cleanup(RERR_SYNTAX);
 609                 return;
 610         }
 611
 612
 613         if (argc > 0) {
 614                 dir = argv[0];
 615                 argc--;
 616                 argv++;
 617                 if (!am_daemon && !push_dir(dir)) {
 618                         rsyserr(FERROR, errno, "push_dir#4 %s failed",
 619                                 full_fname(dir));
 620                         exit_cleanup(RERR_FILESELECT);
 621                 }
 622         }
 623
 624         io_start_buffering_in();
 625         if (delete_mode && !delete_excluded)
 626                 recv_filter_list(f_in);
 627         if (cvs_exclude && protocol_version < 29)
 628                 add_filter(&filter_list, ":C", 0);
 629
 630         if (filesfrom_fd >= 0) {
 631                 /* We need to send the files-from names to the sender at the
 632                  * same time that we receive the file-list from them, so we
 633                  * need the IO routines to automatically write out the names
 634                  * onto our f_out socket as we read the file-list.  This
 635                  * avoids both deadlock and extra delays/buffers. */
 636                 io_set_filesfrom_fds(filesfrom_fd, f_out);
 637                 filesfrom_fd = -1;
 638         }
 639
 640         flist = recv_file_list(f_in);
 641         verbose = save_verbose;
 642         if (!flist) {
 643                 rprintf(FERROR,"server_recv: recv_file_list error\n");
 644                 exit_cleanup(RERR_FILESELECT);
 645         }
 646
 647         if (argc > 0) {
 648                 if (strcmp(dir,".")) {
 649                         argv[0] += strlen(dir);
 650                         if (argv[0][0] == '/')
 651                                 argv[0]++;
 652                 }
 653                 local_name = get_local_name(flist,argv[0]);
 654         }
 655
 656         status = do_recv(f_in,f_out,flist,local_name);
 657         exit_cleanup(status);
 658 }
 659
 660
 661 int child_main(int argc, char *argv[])
 662 {
 663         start_server(STDIN_FILENO, STDOUT_FILENO, argc, argv);
 664         return 0;
 665 }
 666
 667
 668 void start_server(int f_in, int f_out, int argc, char *argv[])
 669 {
 670         set_nonblocking(f_in);
 671         set_nonblocking(f_out);
 672
 673         io_set_sock_fds(f_in, f_out);
 674         setup_protocol(f_out, f_in);
 675
 676         if (protocol_version >= 23)
 677                 io_start_multiplex_out();
 678
 679         if (am_sender) {
 680                 keep_dirlinks = 0; /* Must be disabled on the sender. */
 681
 682                 recv_filter_list(f_in);
 683                 if (cvs_exclude)
 684                         add_cvs_excludes();
 685                 do_server_sender(f_in, f_out, argc, argv);
 686         } else {
 687                 do_server_recv(f_in, f_out, argc, argv);
 688         }
 689         exit_cleanup(0);
 690 }
 691
 692
 693 /*
 694  * This is called once the connection has been negotiated.  It is used
 695  * for rsyncd, remote-shell, and local connections.
 696  */
 697 int client_run(int f_in, int f_out, pid_t pid, int argc, char *argv[])
 698 {
 699         struct file_list *flist = NULL;
 700         int status = 0, status2 = 0;
 701         char *local_name = NULL;
 702
 703         cleanup_child_pid = pid;
 704         if (!read_batch) {
 705                 set_nonblocking(f_in);
 706                 set_nonblocking(f_out);
 707         }
 708
 709         io_set_sock_fds(f_in, f_out);
 710         setup_protocol(f_out,f_in);
 711
 712         if (protocol_version >= 23 && !read_batch)
 713                 io_start_multiplex_in();
 714
 715         /* We set our stderr file handle to blocking because ssh might have
 716          * set it to non-blocking.  This can be particularly troublesome if
 717          * stderr is a clone of stdout, because ssh would have set our stdout
 718          * to non-blocking at the same time (which can easily cause us to lose
 719          * output from our print statements).  This kluge shouldn't cause ssh
 720          * any problems for how we use it.  Note also that we delayed setting
 721          * this until after the above protocol setup so that we know for sure
 722          * that ssh is done twiddling its file descriptors.  */
 723         set_blocking(STDERR_FILENO);
 724
 725         if (am_sender) {
 726                 keep_dirlinks = 0; /* Must be disabled on the sender. */
 727                 io_start_buffering_out();
 728                 if (!remote_filesfrom_file)
 729                         set_msg_fd_in(f_in);
 730                 if (cvs_exclude)
 731                         add_cvs_excludes();
 732                 if (delete_mode && !delete_excluded)
 733                         send_filter_list(f_out);
 734                 if (remote_filesfrom_file)
 735                         filesfrom_fd = f_in;
 736
 737                 if (write_batch)
 738                         start_write_batch(f_out);
 739                 if (!read_batch) /* don't write to pipe */
 740                         flist = send_file_list(f_out,argc,argv);
 741                 set_msg_fd_in(-1);
 742                 if (verbose > 3)
 743                         rprintf(FINFO,"file list sent\n");
 744
 745                 io_flush(NORMAL_FLUSH);
 746                 send_files(flist,f_out,f_in);
 747                 io_flush(FULL_FLUSH);
 748                 if (protocol_version >= 24) {
 749                         /* final goodbye message */
 750                         read_int(f_in);
 751                 }
 752                 if (pid != -1) {
 753                         if (verbose > 3)
 754                                 rprintf(FINFO,"client_run waiting on %d\n", (int) pid);
 755                         io_flush(FULL_FLUSH);
 756                         wait_process(pid, &status);
 757                 }
 758                 report(-1);
 759                 io_flush(FULL_FLUSH);
 760                 exit_cleanup(status);
 761         }
 762
 763         if (argc == 0)
 764                 list_only |= 1;
 765
 766         if (!read_batch)
 767                 send_filter_list(f_out);
 768         if (cvs_exclude)
 769                 add_cvs_excludes();
 770
 771         if (filesfrom_fd >= 0) {
 772                 io_set_filesfrom_fds(filesfrom_fd, f_out);
 773                 filesfrom_fd = -1;
 774         }
 775
 776         if (write_batch)
 777                 start_write_batch(f_in);
 778         flist = recv_file_list(f_in);
 779         if (!flist || flist->count == 0) {
 780                 rprintf(FINFO, "client: nothing to do: "
 781                         "perhaps you need to specify some filenames or "
 782                         "the --recursive option?\n");
 783                 exit_cleanup(0);
 784         }
 785
 786         local_name = get_local_name(flist,argv[0]);
 787
 788         status2 = do_recv(f_in,f_out,flist,local_name);
 789
 790         if (pid != -1) {
 791                 if (verbose > 3)
 792                         rprintf(FINFO,"client_run2 waiting on %d\n", (int) pid);
 793                 io_flush(FULL_FLUSH);
 794                 wait_process(pid, &status);
 795         }
 796
 797         return MAX(status, status2);
 798 }
 799
 800 static int copy_argv (char *argv[])
 801 {
 802         int i;
 803
 804         for (i = 0; argv[i]; i++) {
 805                 if (!(argv[i] = strdup(argv[i]))) {
 806                         rprintf (FERROR, "out of memory at %s(%d)\n",
 807                                  __FILE__, __LINE__);
 808                         return RERR_MALLOC;
 809                 }
 810         }
 811
 812         return 0;
 813 }
 814
 815
 816 /**
 817  * Start a client for either type of remote connection.  Work out
 818  * whether the arguments request a remote shell or rsyncd connection,
 819  * and call the appropriate connection function, then run_client.
 820  *
 821  * Calls either start_socket_client (for sockets) or do_cmd and
 822  * client_run (for ssh).
 823  **/
 824 static int start_client(int argc, char *argv[])
 825 {
 826         char *p;
 827         char *shell_machine = NULL;
 828         char *shell_path = NULL;
 829         char *shell_user = NULL;
 830         int ret;
 831         pid_t pid;
 832         int f_in,f_out;
 833         int rc;
 834
 835         /* Don't clobber argv[] so that ps(1) can still show the right
 836          * command line. */
 837         if ((rc = copy_argv(argv)))
 838                 return rc;
 839
 840         /* rsync:// always uses rsync server over direct socket connection */
 841         if (strncasecmp(URL_PREFIX, argv[0], strlen(URL_PREFIX)) == 0
 842             && !read_batch) {
 843                 char *host, *path;
 844
 845                 host = argv[0] + strlen(URL_PREFIX);
 846                 p = strchr(host,'/');
 847                 if (p) {
 848                         *p = '\0';
 849                         path = p+1;
 850                 } else
 851                         path = "";
 852                 if (*host == '[' && (p = strchr(host, ']')) != NULL) {
 853                         host++;
 854                         *p++ = '\0';
 855                         if (*p != ':')
 856                                 p = NULL;
 857                 } else
 858                         p = strchr(host, ':');
 859                 if (p) {
 860                         rsync_port = atoi(p+1);
 861                         *p = '\0';
 862                 }
 863                 return start_socket_client(host, path, argc-1, argv+1);
 864         }
 865
 866         if (!read_batch) { /* for read_batch, NO source is specified */
 867                 p = find_colon(argv[0]);
 868                 if (p) { /* source is remote */
 869                         if (remote_filesfrom_file
 870                          && remote_filesfrom_file != files_from + 1
 871                          && strncmp(files_from, argv[0], p-argv[0]+1) != 0) {
 872                                 rprintf(FERROR,
 873                                         "--files-from hostname is not the same as the transfer hostname\n");
 874                                 exit_cleanup(RERR_SYNTAX);
 875                         }
 876                         if (p[1] == ':') { /* double colon */
 877                                 *p = 0;
 878                                 if (!shell_cmd) {
 879                                         return start_socket_client(argv[0], p+2,
 880                                                                    argc-1, argv+1);
 881                                 }
 882                                 p++;
 883                                 daemon_over_rsh = 1;
 884                         }
 885
 886                         if (argc < 1) { /* destination required */
 887                                 usage(FERROR);
 888                                 exit_cleanup(RERR_SYNTAX);
 889                         }
 890
 891                         am_sender = 0;
 892                         *p = 0;
 893                         shell_machine = argv[0];
 894                         shell_path = p+1;
 895                         argv++;
 896                 } else { /* source is local */
 897                         am_sender = 1;
 898
 899                         /* rsync:// destination uses rsync server over direct socket */
 900                         if (strncasecmp(URL_PREFIX, argv[argc-1], strlen(URL_PREFIX)) == 0) {
 901                                 char *host, *path;
 902
 903                                 host = argv[argc-1] + strlen(URL_PREFIX);
 904                                 p = strchr(host,'/');
 905                                 if (p) {
 906                                         *p = '\0';
 907                                         path = p+1;
 908                                 } else
 909                                         path = "";
 910                                 if (*host == '[' && (p = strchr(host, ']')) != NULL) {
 911                                         host++;
 912                                         *p++ = '\0';
 913                                         if (*p != ':')
 914                                                 p = NULL;
 915                                 } else
 916                                         p = strchr(host, ':');
 917                                 if (p) {
 918                                         rsync_port = atoi(p+1);
 919                                         *p = '\0';
 920                                 }
 921                                 return start_socket_client(host, path, argc-1, argv);
 922                         }
 923
 924                         p = find_colon(argv[argc-1]); /* look in dest arg */
 925                         if (p && remote_filesfrom_file
 926                          && remote_filesfrom_file != files_from + 1
 927                          && strncmp(files_from, argv[argc-1], p-argv[argc-1]+1) != 0) {
 928                                 rprintf(FERROR,
 929                                         "--files-from hostname is not the same as the transfer hostname\n");
 930                                 exit_cleanup(RERR_SYNTAX);
 931                         }
 932                         if (!p) { /* no colon found, so src & dest are local */
 933                                 local_server = 1;
 934                                 if (remote_filesfrom_file) {
 935                                         rprintf(FERROR,
 936                                                 "--files-from cannot be remote when the transfer is local\n");
 937                                         exit_cleanup(RERR_SYNTAX);
 938                                 }
 939                         } else if (p[1] == ':') { /* double colon */
 940                                 *p = 0;
 941                                 if (!shell_cmd) {
 942                                         return start_socket_client(argv[argc-1], p+2,
 943                                                                    argc-1, argv);
 944                                 }
 945                                 p++;
 946                                 daemon_over_rsh = 1;
 947                         }
 948
 949                         if (argc < 2) {
 950                                 usage(FERROR);
 951                                 exit_cleanup(RERR_SYNTAX);
 952                         }
 953
 954                         if (local_server) {
 955                                 shell_machine = NULL;
 956                                 shell_path = argv[argc-1];
 957                         } else {
 958                                 *p = 0;
 959                                 shell_machine = argv[argc-1];
 960                                 shell_path = p+1;
 961                         }
 962                 }
 963                 argc--;
 964         } else {  /* read_batch */
 965                 local_server = 1;
 966                 shell_path = argv[argc-1];
 967                 if (find_colon(shell_path)) {
 968                         rprintf(FERROR, "remote destination is not allowed with --read-batch\n");
 969                         exit_cleanup(RERR_SYNTAX);
 970                 }
 971         }
 972
 973         if (shell_machine) {
 974                 p = strrchr(shell_machine,'@');
 975                 if (p) {
 976                         *p = 0;
 977                         shell_user = shell_machine;
 978                         shell_machine = p+1;
 979                 }
 980         }
 981
 982         if (verbose > 3) {
 983                 rprintf(FINFO,"cmd=%s machine=%s user=%s path=%s\n",
 984                         shell_cmd?shell_cmd:"",
 985                         shell_machine?shell_machine:"",
 986                         shell_user?shell_user:"",
 987                         shell_path?shell_path:"");
 988         }
 989
 990         /* for remote source, only single dest arg can remain ... */
 991         if (!am_sender && argc > 1) {
 992                 usage(FERROR);
 993                 exit_cleanup(RERR_SYNTAX);
 994         }
 995
 996         /* ... or no dest at all */
 997         if (!am_sender && argc == 0)
 998                 list_only |= 1;
 999
1000         pid = do_cmd(shell_cmd,shell_machine,shell_user,shell_path,
1001                      &f_in,&f_out);
1002
1003         /* if we're running an rsync server on the remote host over a
1004          * remote shell command, we need to do the RSYNCD protocol first */
1005         if (daemon_over_rsh) {
1006                 int tmpret;
1007                 tmpret = start_inband_exchange(shell_user, shell_path,
1008                                                f_in, f_out, argc);
1009                 if (tmpret < 0)
1010                         return tmpret;
1011         }
1012
1013         ret = client_run(f_in, f_out, pid, argc, argv);
1014
1015         fflush(stdout);
1016         fflush(stderr);
1017
1018         return ret;
1019 }
1020
1021
1022 static RETSIGTYPE sigusr1_handler(UNUSED(int val))
1023 {
1024         exit_cleanup(RERR_SIGNAL);
1025 }
1026
1027 static RETSIGTYPE sigusr2_handler(UNUSED(int val))
1028 {
1029         if (log_got_error) _exit(RERR_PARTIAL);
1030         _exit(0);
1031 }
1032
1033 static RETSIGTYPE sigchld_handler(UNUSED(int val))
1034 {
1035 #ifdef WNOHANG
1036         int cnt, status;
1037         pid_t pid;
1038         /* An empty waitpid() loop was put here by Tridge and we could never
1039          * get him to explain why he put it in, so rather than taking it
1040          * out we're instead saving the child exit statuses for later use.
1041          * The waitpid() loop presumably eliminates all possibility of leaving
1042          * zombie children, maybe that's why he did it.
1043          */
1044         while ((pid = waitpid(-1, &status, WNOHANG)) > 0) {
1045                 /* save the child's exit status */
1046                 for (cnt = 0; cnt < MAXCHILDPROCS; cnt++) {
1047                         if (pid_stat_table[cnt].pid == 0) {
1048                                 pid_stat_table[cnt].pid = pid;
1049                                 pid_stat_table[cnt].status = status;
1050                                 break;
1051                         }
1052                 }
1053         }
1054 #endif
1055 }
1056
1057
1058 /**
1059  * This routine catches signals and tries to send them to gdb.
1060  *
1061  * Because it's called from inside a signal handler it ought not to
1062  * use too many library routines.
1063  *
1064  * @todo Perhaps use "screen -X" instead/as well, to help people
1065  * debugging without easy access to X.  Perhaps use an environment
1066  * variable, or just call a script?
1067  *
1068  * @todo The /proc/ magic probably only works on Linux (and
1069  * Solaris?)  Can we be more portable?
1070  **/
1071 #ifdef MAINTAINER_MODE
1072 const char *get_panic_action(void)
1073 {
1074         const char *cmd_fmt = getenv("RSYNC_PANIC_ACTION");
1075
1076         if (cmd_fmt)
1077                 return cmd_fmt;
1078         else
1079                 return "xterm -display :0 -T Panic -n Panic "
1080                         "-e gdb /proc/%d/exe %d";
1081 }
1082
1083
1084 /**
1085  * Handle a fatal signal by launching a debugger, controlled by $RSYNC_PANIC_ACTION.
1086  *
1087  * This signal handler is only installed if we were configured with
1088  * --enable-maintainer-mode.  Perhaps it should always be on and we
1089  * should just look at the environment variable, but I'm a bit leery
1090  * of a signal sending us into a busy loop.
1091  **/
1092 static RETSIGTYPE rsync_panic_handler(UNUSED(int whatsig))
1093 {
1094         char cmd_buf[300];
1095         int ret;
1096
1097         sprintf(cmd_buf, get_panic_action(),
1098                 getpid(), getpid());
1099
1100         /* Unless we failed to execute gdb, we allow the process to
1101          * continue.  I'm not sure if that's right. */
1102         ret = system(cmd_buf);
1103         if (ret)
1104                 _exit(ret);
1105 }
1106 #endif
1107
1108
1109 int main(int argc,char *argv[])
1110 {
1111         int ret;
1112         int orig_argc = argc;
1113         char **orig_argv = argv;
1114
1115         signal(SIGUSR1, sigusr1_handler);
1116         signal(SIGUSR2, sigusr2_handler);
1117         signal(SIGCHLD, sigchld_handler);
1118 #ifdef MAINTAINER_MODE
1119         signal(SIGSEGV, rsync_panic_handler);
1120         signal(SIGFPE, rsync_panic_handler);
1121         signal(SIGABRT, rsync_panic_handler);
1122         signal(SIGBUS, rsync_panic_handler);
1123 #endif /* def MAINTAINER_MODE */
1124
1125         starttime = time(NULL);
1126         am_root = (MY_UID() == 0);
1127
1128         memset(&stats, 0, sizeof(stats));
1129
1130         if (argc < 2) {
1131                 usage(FERROR);
1132                 exit_cleanup(RERR_SYNTAX);
1133         }
1134
1135         /* we set a 0 umask so that correct file permissions can be
1136          * carried across */
1137         orig_umask = (int)umask(0);
1138
1139         if (!parse_arguments(&argc, (const char ***) &argv, 1)) {
1140                 /* FIXME: We ought to call the same error-handling
1141                  * code here, rather than relying on getopt. */
1142                 option_error();
1143                 exit_cleanup(RERR_SYNTAX);
1144         }
1145
1146         signal(SIGINT,SIGNAL_CAST sig_int);
1147         signal(SIGHUP,SIGNAL_CAST sig_int);
1148         signal(SIGTERM,SIGNAL_CAST sig_int);
1149
1150         /* Ignore SIGPIPE; we consistently check error codes and will
1151          * see the EPIPE. */
1152         signal(SIGPIPE, SIG_IGN);
1153
1154         /* Initialize push_dir here because on some old systems getcwd
1155          * (implemented by forking "pwd" and reading its output) doesn't
1156          * work when there are other child processes.  Also, on all systems
1157          * that implement getcwd that way "pwd" can't be found after chroot. */
1158         push_dir(NULL);
1159
1160         init_flist();
1161
1162         if (write_batch || read_batch) {
1163                 if (write_batch)
1164                         write_batch_shell_file(orig_argc, orig_argv, argc);
1165
1166                 if (read_batch && strcmp(batch_name, "-") == 0)
1167                         batch_fd = STDIN_FILENO;
1168                 else {
1169                         batch_fd = do_open(batch_name,
1170                                    write_batch ? O_WRONLY | O_CREAT | O_TRUNC
1171                                    : O_RDONLY, S_IRUSR | S_IWUSR);
1172                 }
1173                 if (batch_fd < 0) {
1174                         rsyserr(FERROR, errno, "Batch file %s open error",
1175                                 batch_name);
1176                         exit_cleanup(RERR_FILEIO);
1177                 }
1178                 if (read_batch)
1179                         read_stream_flags(batch_fd);
1180         }
1181
1182         if (am_daemon && !am_server)
1183                 return daemon_main();
1184
1185         if (argc < 1) {
1186                 usage(FERROR);
1187                 exit_cleanup(RERR_SYNTAX);
1188         }
1189
1190         if (dry_run)
1191                 verbose = MAX(verbose,1);
1192
1193         if (am_server) {
1194                 set_nonblocking(STDIN_FILENO);
1195                 set_nonblocking(STDOUT_FILENO);
1196                 if (am_daemon)
1197                         return start_daemon(STDIN_FILENO, STDOUT_FILENO);
1198                 start_server(STDIN_FILENO, STDOUT_FILENO, argc, argv);
1199         }
1200
1201         ret = start_client(argc, argv);
1202         if (ret == -1)
1203                 exit_cleanup(RERR_STARTCLIENT);
1204         else
1205                 exit_cleanup(ret);
1206
1207         return ret;
1208 }