main.c

   1 /* -*- c-file-style: "linux" -*-
   2
   3    Copyright (C) 1996-2001 by Andrew Tridgell <tridge@samba.org>
   4    Copyright (C) Paul Mackerras 1996
   5    Copyright (C) 2001, 2002 by Martin Pool <mbp@samba.org>
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20 */
  21
  22 #include "rsync.h"
  23
  24 time_t starttime = 0;
  25
  26 extern int verbose;
  27 extern int dry_run;
  28 extern int list_only;
  29 extern int am_root;
  30 extern int am_server;
  31 extern int am_sender;
  32 extern int am_generator;
  33 extern int am_daemon;
  34 extern int blocking_io;
  35 extern int remove_sent_files;
  36 extern int daemon_over_rsh;
  37 extern int need_messages_from_generator;
  38 extern int kluge_around_eof;
  39 extern int do_stats;
  40 extern int log_got_error;
  41 extern int module_id;
  42 extern int orig_umask;
  43 extern int copy_links;
  44 extern int keep_dirlinks;
  45 extern int preserve_hard_links;
  46 extern int protocol_version;
  47 extern int recurse;
  48 extern int fuzzy_basis;
  49 extern int relative_paths;
  50 extern int rsync_port;
  51 extern int inplace;
  52 extern int make_backups;
  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 struct stats stats;
  61 extern char *filesfrom_host;
  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
  68 int local_server = 0;
  69 struct file_list *the_file_list;
  70
  71 /* There's probably never more than at most 2 outstanding child processes,
  72  * but set it higher, just in case. */
  73 #define MAXCHILDPROCS 5
  74
  75 struct pid_status {
  76         pid_t pid;
  77         int   status;
  78 } pid_stat_table[MAXCHILDPROCS];
  79
  80 static void show_malloc_stats(void);
  81
  82 /****************************************************************************
  83 wait for a process to exit, calling io_flush while waiting
  84 ****************************************************************************/
  85 void wait_process(pid_t pid, int *status)
  86 {
  87         pid_t waited_pid;
  88         int cnt;
  89
  90         while ((waited_pid = waitpid(pid, status, WNOHANG)) == 0) {
  91                 msleep(20);
  92                 io_flush(FULL_FLUSH);
  93         }
  94
  95         if (waited_pid == -1 && errno == ECHILD) {
  96                 /* status of requested child no longer available.
  97                  * check to see if it was processed by the sigchld_handler.
  98                  */
  99                 for (cnt = 0;  cnt < MAXCHILDPROCS; cnt++) {
 100                         if (pid == pid_stat_table[cnt].pid) {
 101                                 *status = pid_stat_table[cnt].status;
 102                                 pid_stat_table[cnt].pid = 0;
 103                                 break;
 104                         }
 105                 }
 106         }
 107
 108         /* TODO: If the child exited on a signal, then log an
 109          * appropriate error message.  Perhaps we should also accept a
 110          * message describing the purpose of the child.  Also indicate
 111          * this to the caller so that thhey know something went
 112          * wrong.  */
 113         *status = WEXITSTATUS(*status);
 114 }
 115
 116 /* This function gets called from all 3 processes.  We want the client side
 117  * to actually output the text, but the sender is the only process that has
 118  * all the stats we need.  So, if we're a client sender, we do the report.
 119  * If we're a server sender, we write the stats on the supplied fd.  If
 120  * we're the client receiver we read the stats from the supplied fd and do
 121  * the report.  All processes might also generate a set of debug stats, if
 122  * the verbose level is high enough (this is the only thing that the
 123  * generator process and the server receiver ever do here). */
 124 static void report(int f)
 125 {
 126         /* Cache two stats because the read/write code can change it. */
 127         int64 total_read = stats.total_read;
 128         int64 total_written = stats.total_written;
 129         time_t t = time(NULL);
 130
 131         if (do_stats && verbose > 1) {
 132                 /* These come out from every process */
 133                 show_malloc_stats();
 134                 show_flist_stats();
 135         }
 136
 137         if (am_generator)
 138                 return;
 139
 140         if (am_daemon) {
 141                 log_exit(0, __FILE__, __LINE__);
 142                 if (f == -1 || !am_sender)
 143                         return;
 144         }
 145
 146         if (am_server) {
 147                 if (am_sender) {
 148                         write_longint(f, total_read);
 149                         write_longint(f, total_written);
 150                         write_longint(f, stats.total_size);
 151                         if (protocol_version >= 29) {
 152                                 write_longint(f, stats.flist_buildtime);
 153                                 write_longint(f, stats.flist_xfertime);
 154                         }
 155                 }
 156                 return;
 157         }
 158
 159         /* this is the client */
 160
 161         if (!am_sender) {
 162                 /* Read the first two in opposite order because the meaning of
 163                  * read/write swaps when switching from sender to receiver. */
 164                 total_written = read_longint(f);
 165                 total_read = read_longint(f);
 166                 stats.total_size = read_longint(f);
 167                 if (protocol_version >= 29) {
 168                         stats.flist_buildtime = read_longint(f);
 169                         stats.flist_xfertime = read_longint(f);
 170                 }
 171         } else if (write_batch) {
 172                 /* The --read-batch process is going to be a client
 173                  * receiver, so we need to give it the stats. */
 174                 write_longint(batch_fd, total_read);
 175                 write_longint(batch_fd, total_written);
 176                 write_longint(batch_fd, stats.total_size);
 177                 if (protocol_version >= 29) {
 178                         write_longint(batch_fd, stats.flist_buildtime);
 179                         write_longint(batch_fd, stats.flist_xfertime);
 180                 }
 181         }
 182
 183         if (do_stats) {
 184                 rprintf(FINFO,"\nNumber of files: %d\n", stats.num_files);
 185                 rprintf(FINFO,"Number of files transferred: %d\n",
 186                         stats.num_transferred_files);
 187                 rprintf(FINFO,"Total file size: %.0f bytes\n",
 188                         (double)stats.total_size);
 189                 rprintf(FINFO,"Total transferred file size: %.0f bytes\n",
 190                         (double)stats.total_transferred_size);
 191                 rprintf(FINFO,"Literal data: %.0f bytes\n",
 192                         (double)stats.literal_data);
 193                 rprintf(FINFO,"Matched data: %.0f bytes\n",
 194                         (double)stats.matched_data);
 195                 rprintf(FINFO,"File list size: %d\n", stats.flist_size);
 196                 if (stats.flist_buildtime) {
 197                         rprintf(FINFO,
 198                                 "File list generation time: %.3f seconds\n",
 199                                 (double)stats.flist_buildtime / 1000);
 200                         rprintf(FINFO,
 201                                 "File list transfer time: %.3f seconds\n",
 202                                 (double)stats.flist_xfertime / 1000);
 203                 }
 204                 rprintf(FINFO,"Total bytes sent: %.0f\n",
 205                         (double)total_written);
 206                 rprintf(FINFO,"Total bytes received: %.0f\n",
 207                         (double)total_read);
 208         }
 209
 210         if (verbose || do_stats) {
 211                 rprintf(FINFO,
 212                         "\nsent %.0f bytes  received %.0f bytes  %.2f bytes/sec\n",
 213                         (double)total_written, (double)total_read,
 214                         (total_written + total_read)/(0.5 + (t - starttime)));
 215                 rprintf(FINFO, "total size is %.0f  speedup is %.2f\n",
 216                         (double)stats.total_size,
 217                         (double)stats.total_size / (total_written+total_read));
 218         }
 219
 220         fflush(stdout);
 221         fflush(stderr);
 222 }
 223
 224
 225 /**
 226  * If our C library can get malloc statistics, then show them to FINFO
 227  **/
 228 static void show_malloc_stats(void)
 229 {
 230 #ifdef HAVE_MALLINFO
 231         struct mallinfo mi;
 232
 233         mi = mallinfo();
 234
 235         rprintf(FINFO, "\n" RSYNC_NAME "[%d] (%s%s%s) heap statistics:\n",
 236                 getpid(), am_server ? "server " : "",
 237                 am_daemon ? "daemon " : "", who_am_i());
 238         rprintf(FINFO, "  arena:     %10ld   (bytes from sbrk)\n",
 239                 (long)mi.arena);
 240         rprintf(FINFO, "  ordblks:   %10ld   (chunks not in use)\n",
 241                 (long)mi.ordblks);
 242         rprintf(FINFO, "  smblks:    %10ld\n",
 243                 (long)mi.smblks);
 244         rprintf(FINFO, "  hblks:     %10ld   (chunks from mmap)\n",
 245                 (long)mi.hblks);
 246         rprintf(FINFO, "  hblkhd:    %10ld   (bytes from mmap)\n",
 247                 (long)mi.hblkhd);
 248         rprintf(FINFO, "  allmem:    %10ld   (bytes from sbrk + mmap)\n",
 249                 (long)mi.arena + mi.hblkhd);
 250         rprintf(FINFO, "  usmblks:   %10ld\n",
 251                 (long)mi.usmblks);
 252         rprintf(FINFO, "  fsmblks:   %10ld\n",
 253                 (long)mi.fsmblks);
 254         rprintf(FINFO, "  uordblks:  %10ld   (bytes used)\n",
 255                 (long)mi.uordblks);
 256         rprintf(FINFO, "  fordblks:  %10ld   (bytes free)\n",
 257                 (long)mi.fordblks);
 258         rprintf(FINFO, "  keepcost:  %10ld   (bytes in releasable chunk)\n",
 259                 (long)mi.keepcost);
 260 #endif /* HAVE_MALLINFO */
 261 }
 262
 263
 264 /* Start the remote shell.   cmd may be NULL to use the default. */
 265 static pid_t do_cmd(char *cmd, char *machine, char *user, char *path,
 266                     int *f_in, int *f_out)
 267 {
 268         int i, argc = 0;
 269         char *args[MAX_ARGS];
 270         pid_t ret;
 271         char *tok, *dir = NULL;
 272         int dash_l_set = 0;
 273
 274         if (!read_batch && !local_server) {
 275                 char *rsh_env = getenv(RSYNC_RSH_ENV);
 276                 if (!cmd)
 277                         cmd = rsh_env;
 278                 if (!cmd)
 279                         cmd = RSYNC_RSH;
 280                 cmd = strdup(cmd);
 281                 if (!cmd)
 282                         goto oom;
 283
 284                 for (tok = strtok(cmd, " "); tok; tok = strtok(NULL, " ")) {
 285                         /* Comparison leaves rooms for server_options(). */
 286                         if (argc >= MAX_ARGS - 100) {
 287                                 rprintf(FERROR, "internal: args[] overflowed in do_cmd()\n");
 288                                 exit_cleanup(RERR_SYNTAX);
 289                         }
 290                         args[argc++] = tok;
 291                 }
 292
 293                 /* check to see if we've already been given '-l user' in
 294                  * the remote-shell command */
 295                 for (i = 0; i < argc-1; i++) {
 296                         if (!strcmp(args[i], "-l") && args[i+1][0] != '-')
 297                                 dash_l_set = 1;
 298                 }
 299
 300 #ifdef HAVE_REMSH
 301                 /* remsh (on HPUX) takes the arguments the other way around */
 302                 args[argc++] = machine;
 303                 if (user && !(daemon_over_rsh && dash_l_set)) {
 304                         args[argc++] = "-l";
 305                         args[argc++] = user;
 306                 }
 307 #else
 308                 if (user && !(daemon_over_rsh && dash_l_set)) {
 309                         args[argc++] = "-l";
 310                         args[argc++] = user;
 311                 }
 312                 args[argc++] = machine;
 313 #endif
 314
 315                 args[argc++] = rsync_path;
 316
 317                 if (blocking_io < 0) {
 318                         char *cp;
 319                         if ((cp = strrchr(cmd, '/')) != NULL)
 320                                 cp++;
 321                         else
 322                                 cp = cmd;
 323                         if (strcmp(cp, "rsh") == 0 || strcmp(cp, "remsh") == 0)
 324                                 blocking_io = 1;
 325                 }
 326
 327                 server_options(args,&argc);
 328
 329                 if (argc >= MAX_ARGS - 2) {
 330                         rprintf(FERROR, "internal: args[] overflowed in do_cmd()\n");
 331                         exit_cleanup(RERR_SYNTAX);
 332                 }
 333         }
 334
 335         args[argc++] = ".";
 336
 337         if (!daemon_over_rsh && path && *path)
 338                 args[argc++] = path;
 339
 340         args[argc] = NULL;
 341
 342         if (verbose > 3) {
 343                 rprintf(FINFO,"cmd=");
 344                 for (i = 0; i < argc; i++)
 345                         rprintf(FINFO, "%s ", safe_fname(args[i]));
 346                 rprintf(FINFO,"\n");
 347         }
 348
 349         if (read_batch) {
 350                 int from_gen_pipe[2];
 351                 if (fd_pair(from_gen_pipe) < 0) {
 352                         rsyserr(FERROR, errno, "pipe");
 353                         exit_cleanup(RERR_IPC);
 354                 }
 355                 batch_gen_fd = from_gen_pipe[0];
 356                 *f_out = from_gen_pipe[1];
 357                 *f_in = batch_fd;
 358                 ret = -1; /* no child pid */
 359         } else if (local_server) {
 360                 /* If the user didn't request --[no-]whole-file, force
 361                  * it on, but only if we're not batch processing. */
 362                 if (whole_file < 0 && !write_batch)
 363                         whole_file = 1;
 364                 ret = local_child(argc, args, f_in, f_out, child_main);
 365         } else
 366                 ret = piped_child(args,f_in,f_out);
 367
 368         if (dir)
 369                 free(dir);
 370
 371         return ret;
 372
 373 oom:
 374         out_of_memory("do_cmd");
 375         return 0; /* not reached */
 376 }
 377
 378
 379 static char *get_local_name(struct file_list *flist,char *name)
 380 {
 381         STRUCT_STAT st;
 382         int e;
 383
 384         if (verbose > 2)
 385                 rprintf(FINFO,"get_local_name count=%d %s\n",
 386                         flist->count, NS(name));
 387
 388         if (!name)
 389                 return NULL;
 390
 391         if (do_stat(name,&st) == 0) {
 392                 if (S_ISDIR(st.st_mode)) {
 393                         if (!push_dir(name)) {
 394                                 rsyserr(FERROR, errno, "push_dir#1 %s failed",
 395                                         full_fname(name));
 396                                 exit_cleanup(RERR_FILESELECT);
 397                         }
 398                         return NULL;
 399                 }
 400                 if (flist->count > 1) {
 401                         rprintf(FERROR,"ERROR: destination must be a directory when copying more than 1 file\n");
 402                         exit_cleanup(RERR_FILESELECT);
 403                 }
 404                 return name;
 405         }
 406
 407         if (flist->count <= 1 && ((e = strlen(name)) <= 1 || name[e-1] != '/'))
 408                 return name;
 409
 410         if (do_mkdir(name,0777 & ~orig_umask) != 0) {
 411                 rsyserr(FERROR, errno, "mkdir %s failed", full_fname(name));
 412                 exit_cleanup(RERR_FILEIO);
 413         }
 414         if (verbose > 0)
 415                 rprintf(FINFO, "created directory %s\n", safe_fname(name));
 416
 417         if (dry_run) {
 418                 dry_run++;
 419                 return NULL;
 420         }
 421
 422         if (!push_dir(name)) {
 423                 rsyserr(FERROR, errno, "push_dir#2 %s failed",
 424                         full_fname(name));
 425                 exit_cleanup(RERR_FILESELECT);
 426         }
 427
 428         return NULL;
 429 }
 430
 431
 432 /* This is only called by the sender. */
 433 static void read_final_goodbye(int f_in, int f_out)
 434 {
 435         int i;
 436
 437         if (protocol_version < 29)
 438                 i = read_int(f_in);
 439         else {
 440                 while ((i = read_int(f_in)) == the_file_list->count
 441                     && read_shortint(f_in) == ITEM_IS_NEW) {
 442                         /* Forward the keep-alive (no-op) to the receiver. */
 443                         write_int(f_out, the_file_list->count);
 444                         write_shortint(f_out, ITEM_IS_NEW);
 445                 }
 446         }
 447
 448         if (i != -1) {
 449                 rprintf(FERROR, "Invalid packet at end of run [%s]\n",
 450                         who_am_i());
 451                 exit_cleanup(RERR_PROTOCOL);
 452         }
 453 }
 454
 455
 456 static void do_server_sender(int f_in, int f_out, int argc,char *argv[])
 457 {
 458         int i;
 459         struct file_list *flist;
 460         char *dir = argv[0];
 461
 462         if (verbose > 2) {
 463                 rprintf(FINFO, "server_sender starting pid=%ld\n",
 464                         (long)getpid());
 465         }
 466
 467         if (am_daemon && lp_write_only(module_id)) {
 468                 rprintf(FERROR, "ERROR: module is write only\n");
 469                 exit_cleanup(RERR_SYNTAX);
 470                 return;
 471         }
 472         if (am_daemon && lp_read_only(module_id) && remove_sent_files) {
 473                 rprintf(FERROR,
 474                     "ERROR: --remove-sent-files cannot be used with a read-only module\n");
 475                 exit_cleanup(RERR_SYNTAX);
 476                 return;
 477         }
 478
 479         if (!relative_paths && !push_dir(dir)) {
 480                 rsyserr(FERROR, errno, "push_dir#3 %s failed",
 481                         full_fname(dir));
 482                 exit_cleanup(RERR_FILESELECT);
 483         }
 484         argc--;
 485         argv++;
 486
 487         if (strcmp(dir,".")) {
 488                 int l = strlen(dir);
 489                 if (strcmp(dir,"/") == 0)
 490                         l = 0;
 491                 for (i = 0; i < argc; i++)
 492                         argv[i] += l+1;
 493         }
 494
 495         if (argc == 0 && (recurse || list_only)) {
 496                 argc = 1;
 497                 argv--;
 498                 argv[0] = ".";
 499         }
 500
 501         flist = send_file_list(f_out,argc,argv);
 502         if (!flist || flist->count == 0) {
 503                 exit_cleanup(0);
 504         }
 505         the_file_list = flist;
 506
 507         io_start_buffering_in();
 508         io_start_buffering_out();
 509
 510         send_files(flist,f_out,f_in);
 511         io_flush(FULL_FLUSH);
 512         report(f_out);
 513         if (protocol_version >= 24)
 514                 read_final_goodbye(f_in, f_out);
 515         io_flush(FULL_FLUSH);
 516         exit_cleanup(0);
 517 }
 518
 519
 520 static int do_recv(int f_in,int f_out,struct file_list *flist,char *local_name)
 521 {
 522         int pid;
 523         int status = 0;
 524         int error_pipe[2], name_pipe[2];
 525         BOOL need_name_pipe = (basis_dir[0] || partial_dir || fuzzy_basis
 526                             || (inplace && make_backups)) && !dry_run;
 527
 528         /* The receiving side mustn't obey this, or an existing symlink that
 529          * points to an identical file won't be replaced by the referent. */
 530         copy_links = 0;
 531
 532         if (preserve_hard_links)
 533                 init_hard_links();
 534
 535         if (fd_pair(error_pipe) < 0
 536             || (need_name_pipe && fd_pair(name_pipe) < 0)) {
 537                 rsyserr(FERROR, errno, "pipe failed in do_recv");
 538                 exit_cleanup(RERR_IPC);
 539         }
 540
 541         io_flush(NORMAL_FLUSH);
 542
 543         if ((pid = do_fork()) == -1) {
 544                 rsyserr(FERROR, errno, "fork failed in do_recv");
 545                 exit_cleanup(RERR_IPC);
 546         }
 547
 548         if (pid == 0) {
 549                 close(error_pipe[0]);
 550                 if (need_name_pipe) {
 551                         close(name_pipe[1]);
 552                         set_blocking(name_pipe[0]);
 553                 } else
 554                         name_pipe[0] = -1;
 555                 if (f_in != f_out)
 556                         close(f_out);
 557
 558                 /* we can't let two processes write to the socket at one time */
 559                 close_multiplexing_out();
 560
 561                 /* set place to send errors */
 562                 set_msg_fd_out(error_pipe[1]);
 563
 564                 recv_files(f_in, flist, local_name, name_pipe[0]);
 565                 io_flush(FULL_FLUSH);
 566                 report(f_in);
 567
 568                 send_msg(MSG_DONE, "", 0);
 569                 io_flush(FULL_FLUSH);
 570
 571                 /* Handle any keep-alive packets from the post-processing work
 572                  * that the generator does. */
 573                 if (protocol_version >= 29) {
 574                         kluge_around_eof = -1;
 575
 576                         /* This should only get stopped via a USR2 signal. */
 577                         while (read_int(f_in) == flist->count
 578                             && read_shortint(f_in) == ITEM_IS_NEW) {}
 579
 580                         rprintf(FERROR, "Invalid packet at end of run [%s]\n",
 581                                 who_am_i());
 582                         exit_cleanup(RERR_PROTOCOL);
 583                 }
 584
 585                 /* Finally, we go to sleep until our parent kills us with a
 586                  * USR2 signal.  We sleep for a short time, as on some OSes
 587                  * a signal won't interrupt a sleep! */
 588                 while (1)
 589                         msleep(20);
 590         }
 591
 592         am_generator = 1;
 593         close_multiplexing_in();
 594         if (write_batch)
 595                 stop_write_batch();
 596
 597         close(error_pipe[1]);
 598         if (need_name_pipe) {
 599                 close(name_pipe[0]);
 600                 set_nonblocking(name_pipe[1]);
 601         } else
 602                 name_pipe[1] = -1;
 603         if (f_in != f_out)
 604                 close(f_in);
 605
 606         io_start_buffering_out();
 607
 608         set_msg_fd_in(error_pipe[0]);
 609
 610         generate_files(f_out, flist, local_name, name_pipe[1]);
 611
 612         report(-1);
 613         io_flush(FULL_FLUSH);
 614         if (protocol_version >= 24) {
 615                 /* send a final goodbye message */
 616                 write_int(f_out, -1);
 617         }
 618         io_flush(FULL_FLUSH);
 619
 620         set_msg_fd_in(-1);
 621         kill(pid, SIGUSR2);
 622         wait_process(pid, &status);
 623         return status;
 624 }
 625
 626
 627 static void do_server_recv(int f_in, int f_out, int argc,char *argv[])
 628 {
 629         int status;
 630         struct file_list *flist;
 631         char *local_name = NULL;
 632         char *dir = NULL;
 633         int save_verbose = verbose;
 634
 635         if (filesfrom_fd >= 0) {
 636                 /* We can't mix messages with files-from data on the socket,
 637                  * so temporarily turn off verbose messages. */
 638                 verbose = 0;
 639         }
 640
 641         if (verbose > 2) {
 642                 rprintf(FINFO, "server_recv(%d) starting pid=%ld\n",
 643                         argc, (long)getpid());
 644         }
 645
 646         if (am_daemon && lp_read_only(module_id)) {
 647                 rprintf(FERROR,"ERROR: module is read only\n");
 648                 exit_cleanup(RERR_SYNTAX);
 649                 return;
 650         }
 651
 652
 653         if (argc > 0) {
 654                 dir = argv[0];
 655                 argc--;
 656                 argv++;
 657                 if (!am_daemon && !push_dir(dir)) {
 658                         rsyserr(FERROR, errno, "push_dir#4 %s failed",
 659                                 full_fname(dir));
 660                         exit_cleanup(RERR_FILESELECT);
 661                 }
 662         }
 663
 664         io_start_buffering_in();
 665         recv_filter_list(f_in);
 666
 667         if (filesfrom_fd >= 0) {
 668                 /* We need to send the files-from names to the sender at the
 669                  * same time that we receive the file-list from them, so we
 670                  * need the IO routines to automatically write out the names
 671                  * onto our f_out socket as we read the file-list.  This
 672                  * avoids both deadlock and extra delays/buffers. */
 673                 io_set_filesfrom_fds(filesfrom_fd, f_out);
 674                 filesfrom_fd = -1;
 675         }
 676
 677         flist = recv_file_list(f_in);
 678         verbose = save_verbose;
 679         if (!flist) {
 680                 rprintf(FERROR,"server_recv: recv_file_list error\n");
 681                 exit_cleanup(RERR_FILESELECT);
 682         }
 683         the_file_list = flist;
 684
 685         if (argc > 0) {
 686                 if (strcmp(dir,".")) {
 687                         argv[0] += strlen(dir);
 688                         if (argv[0][0] == '/')
 689                                 argv[0]++;
 690                 }
 691                 local_name = get_local_name(flist,argv[0]);
 692         }
 693
 694         status = do_recv(f_in,f_out,flist,local_name);
 695         exit_cleanup(status);
 696 }
 697
 698
 699 int child_main(int argc, char *argv[])
 700 {
 701         start_server(STDIN_FILENO, STDOUT_FILENO, argc, argv);
 702         return 0;
 703 }
 704
 705
 706 void start_server(int f_in, int f_out, int argc, char *argv[])
 707 {
 708         set_nonblocking(f_in);
 709         set_nonblocking(f_out);
 710
 711         io_set_sock_fds(f_in, f_out);
 712         setup_protocol(f_out, f_in);
 713
 714         if (protocol_version >= 23)
 715                 io_start_multiplex_out();
 716
 717         if (am_sender) {
 718                 keep_dirlinks = 0; /* Must be disabled on the sender. */
 719                 if (need_messages_from_generator)
 720                         io_start_multiplex_in();
 721
 722                 recv_filter_list(f_in);
 723                 do_server_sender(f_in, f_out, argc, argv);
 724         } else {
 725                 do_server_recv(f_in, f_out, argc, argv);
 726         }
 727         exit_cleanup(0);
 728 }
 729
 730
 731 /*
 732  * This is called once the connection has been negotiated.  It is used
 733  * for rsyncd, remote-shell, and local connections.
 734  */
 735 int client_run(int f_in, int f_out, pid_t pid, int argc, char *argv[])
 736 {
 737         struct file_list *flist = NULL;
 738         int status = 0, status2 = 0;
 739         char *local_name = NULL;
 740
 741         cleanup_child_pid = pid;
 742         if (!read_batch) {
 743                 set_nonblocking(f_in);
 744                 set_nonblocking(f_out);
 745         }
 746
 747         io_set_sock_fds(f_in, f_out);
 748         setup_protocol(f_out,f_in);
 749
 750         if (protocol_version >= 23 && !read_batch)
 751                 io_start_multiplex_in();
 752
 753         /* We set our stderr file handle to blocking because ssh might have
 754          * set it to non-blocking.  This can be particularly troublesome if
 755          * stderr is a clone of stdout, because ssh would have set our stdout
 756          * to non-blocking at the same time (which can easily cause us to lose
 757          * output from our print statements).  This kluge shouldn't cause ssh
 758          * any problems for how we use it.  Note also that we delayed setting
 759          * this until after the above protocol setup so that we know for sure
 760          * that ssh is done twiddling its file descriptors.  */
 761         set_blocking(STDERR_FILENO);
 762
 763         if (am_sender) {
 764                 keep_dirlinks = 0; /* Must be disabled on the sender. */
 765                 io_start_buffering_out();
 766                 if (!filesfrom_host)
 767                         set_msg_fd_in(f_in);
 768                 send_filter_list(f_out);
 769                 if (filesfrom_host)
 770                         filesfrom_fd = f_in;
 771
 772                 if (write_batch)
 773                         start_write_batch(f_out);
 774                 flist = send_file_list(f_out, argc, argv);
 775                 set_msg_fd_in(-1);
 776                 if (verbose > 3)
 777                         rprintf(FINFO,"file list sent\n");
 778                 the_file_list = flist;
 779
 780                 io_flush(NORMAL_FLUSH);
 781                 send_files(flist,f_out,f_in);
 782                 io_flush(FULL_FLUSH);
 783                 if (protocol_version >= 24)
 784                         read_final_goodbye(f_in, f_out);
 785                 if (pid != -1) {
 786                         if (verbose > 3)
 787                                 rprintf(FINFO,"client_run waiting on %d\n", (int) pid);
 788                         io_flush(FULL_FLUSH);
 789                         wait_process(pid, &status);
 790                 }
 791                 report(-1);
 792                 io_flush(FULL_FLUSH);
 793                 exit_cleanup(status);
 794         }
 795
 796         if (need_messages_from_generator && !read_batch)
 797                 io_start_multiplex_out();
 798
 799         if (argc == 0)
 800                 list_only |= 1;
 801
 802         send_filter_list(read_batch ? -1 : f_out);
 803
 804         if (filesfrom_fd >= 0) {
 805                 io_set_filesfrom_fds(filesfrom_fd, f_out);
 806                 filesfrom_fd = -1;
 807         }
 808
 809         if (write_batch)
 810                 start_write_batch(f_in);
 811         flist = recv_file_list(f_in);
 812         if (!flist || flist->count == 0) {
 813                 rprintf(FINFO, "client: nothing to do: "
 814                         "perhaps you need to specify some filenames or "
 815                         "the --recursive option?\n");
 816                 exit_cleanup(0);
 817         }
 818         the_file_list = flist;
 819
 820         local_name = get_local_name(flist,argv[0]);
 821
 822         status2 = do_recv(f_in,f_out,flist,local_name);
 823
 824         if (pid != -1) {
 825                 if (verbose > 3)
 826                         rprintf(FINFO,"client_run2 waiting on %d\n", (int) pid);
 827                 io_flush(FULL_FLUSH);
 828                 wait_process(pid, &status);
 829         }
 830
 831         return MAX(status, status2);
 832 }
 833
 834 static int copy_argv (char *argv[])
 835 {
 836         int i;
 837
 838         for (i = 0; argv[i]; i++) {
 839                 if (!(argv[i] = strdup(argv[i]))) {
 840                         rprintf (FERROR, "out of memory at %s(%d)\n",
 841                                  __FILE__, __LINE__);
 842                         return RERR_MALLOC;
 843                 }
 844         }
 845
 846         return 0;
 847 }
 848
 849
 850 /**
 851  * Start a client for either type of remote connection.  Work out
 852  * whether the arguments request a remote shell or rsyncd connection,
 853  * and call the appropriate connection function, then run_client.
 854  *
 855  * Calls either start_socket_client (for sockets) or do_cmd and
 856  * client_run (for ssh).
 857  **/
 858 static int start_client(int argc, char *argv[])
 859 {
 860         char *p;
 861         char *shell_machine = NULL;
 862         char *shell_path = NULL;
 863         char *shell_user = NULL;
 864         int ret;
 865         pid_t pid;
 866         int f_in,f_out;
 867         int rc;
 868
 869         /* Don't clobber argv[] so that ps(1) can still show the right
 870          * command line. */
 871         if ((rc = copy_argv(argv)))
 872                 return rc;
 873
 874         if (!read_batch) { /* for read_batch, NO source is specified */
 875                 argc--;
 876                 shell_path = check_for_hostspec(argv[0], &shell_machine, &rsync_port);
 877                 if (shell_path) { /* source is remote */
 878                         argv++;
 879                         if (filesfrom_host && *filesfrom_host
 880                             && strcmp(filesfrom_host, shell_machine) != 0) {
 881                                 rprintf(FERROR,
 882                                         "--files-from hostname is not the same as the transfer hostname\n");
 883                                 exit_cleanup(RERR_SYNTAX);
 884                         }
 885                         if (rsync_port) {
 886                                 if (!shell_cmd) {
 887                                         return start_socket_client(shell_machine,
 888                                                                    shell_path,
 889                                                                    argc, argv);
 890                                 }
 891                                 daemon_over_rsh = 1;
 892                         }
 893
 894                         am_sender = 0;
 895                 } else { /* source is local, check dest arg */
 896                         am_sender = 1;
 897
 898                         if (argc < 1) { /* destination required */
 899                                 usage(FERROR);
 900                                 exit_cleanup(RERR_SYNTAX);
 901                         }
 902
 903                         shell_path = check_for_hostspec(argv[argc], &shell_machine, &rsync_port);
 904                         if (shell_path && filesfrom_host && *filesfrom_host
 905                             && strcmp(filesfrom_host, shell_machine) != 0) {
 906                                 rprintf(FERROR,
 907                                         "--files-from hostname is not the same as the transfer hostname\n");
 908                                 exit_cleanup(RERR_SYNTAX);
 909                         }
 910                         if (!shell_path) { /* no hostspec found, so src & dest are local */
 911                                 local_server = 1;
 912                                 if (filesfrom_host) {
 913                                         rprintf(FERROR,
 914                                                 "--files-from cannot be remote when the transfer is local\n");
 915                                         exit_cleanup(RERR_SYNTAX);
 916                                 }
 917                                 shell_machine = NULL;
 918                                 shell_path = argv[argc];
 919                         } else if (rsync_port) {
 920                                 if (!shell_cmd) {
 921                                         return start_socket_client(shell_machine,
 922                                                                    shell_path,
 923                                                                    argc, argv);
 924                                 }
 925                                 daemon_over_rsh = 1;
 926                         }
 927                 }
 928         } else {  /* read_batch */
 929                 local_server = 1;
 930                 shell_path = argv[argc-1];
 931                 if (check_for_hostspec(shell_path, &shell_machine, &rsync_port)) {
 932                         rprintf(FERROR, "remote destination is not allowed with --read-batch\n");
 933                         exit_cleanup(RERR_SYNTAX);
 934                 }
 935         }
 936
 937         if (shell_machine) {
 938                 p = strrchr(shell_machine,'@');
 939                 if (p) {
 940                         *p = 0;
 941                         shell_user = shell_machine;
 942                         shell_machine = p+1;
 943                 }
 944         }
 945
 946         if (verbose > 3) {
 947                 rprintf(FINFO,"cmd=%s machine=%s user=%s path=%s\n",
 948                         shell_cmd ? safe_fname(shell_cmd) : "",
 949                         shell_machine ? safe_fname(shell_machine) : "",
 950                         shell_user ? safe_fname(shell_user) : "",
 951                         shell_path ? safe_fname(shell_path) : "");
 952         }
 953
 954         /* for remote source, only single dest arg can remain ... */
 955         if (!am_sender && argc > 1) {
 956                 usage(FERROR);
 957                 exit_cleanup(RERR_SYNTAX);
 958         }
 959
 960         /* ... or no dest at all */
 961         if (!am_sender && argc == 0)
 962                 list_only |= 1;
 963
 964         pid = do_cmd(shell_cmd,shell_machine,shell_user,shell_path,
 965                      &f_in,&f_out);
 966
 967         /* if we're running an rsync server on the remote host over a
 968          * remote shell command, we need to do the RSYNCD protocol first */
 969         if (daemon_over_rsh) {
 970                 int tmpret;
 971                 tmpret = start_inband_exchange(shell_user, shell_path,
 972                                                f_in, f_out, argc);
 973                 if (tmpret < 0)
 974                         return tmpret;
 975         }
 976
 977         ret = client_run(f_in, f_out, pid, argc, argv);
 978
 979         fflush(stdout);
 980         fflush(stderr);
 981
 982         return ret;
 983 }
 984
 985
 986 static RETSIGTYPE sigusr1_handler(UNUSED(int val))
 987 {
 988         exit_cleanup(RERR_SIGNAL);
 989 }
 990
 991 static RETSIGTYPE sigusr2_handler(UNUSED(int val))
 992 {
 993         close_all();
 994         if (log_got_error) _exit(RERR_PARTIAL);
 995         _exit(0);
 996 }
 997
 998 static RETSIGTYPE sigchld_handler(UNUSED(int val))
 999 {
1000 #ifdef WNOHANG
1001         int cnt, status;
1002         pid_t pid;
1003         /* An empty waitpid() loop was put here by Tridge and we could never
1004          * get him to explain why he put it in, so rather than taking it
1005          * out we're instead saving the child exit statuses for later use.
1006          * The waitpid() loop presumably eliminates all possibility of leaving
1007          * zombie children, maybe that's why he did it.
1008          */
1009         while ((pid = waitpid(-1, &status, WNOHANG)) > 0) {
1010                 /* save the child's exit status */
1011                 for (cnt = 0; cnt < MAXCHILDPROCS; cnt++) {
1012                         if (pid_stat_table[cnt].pid == 0) {
1013                                 pid_stat_table[cnt].pid = pid;
1014                                 pid_stat_table[cnt].status = status;
1015                                 break;
1016                         }
1017                 }
1018         }
1019 #endif
1020 }
1021
1022
1023 /**
1024  * This routine catches signals and tries to send them to gdb.
1025  *
1026  * Because it's called from inside a signal handler it ought not to
1027  * use too many library routines.
1028  *
1029  * @todo Perhaps use "screen -X" instead/as well, to help people
1030  * debugging without easy access to X.  Perhaps use an environment
1031  * variable, or just call a script?
1032  *
1033  * @todo The /proc/ magic probably only works on Linux (and
1034  * Solaris?)  Can we be more portable?
1035  **/
1036 #ifdef MAINTAINER_MODE
1037 const char *get_panic_action(void)
1038 {
1039         const char *cmd_fmt = getenv("RSYNC_PANIC_ACTION");
1040
1041         if (cmd_fmt)
1042                 return cmd_fmt;
1043         else
1044                 return "xterm -display :0 -T Panic -n Panic "
1045                         "-e gdb /proc/%d/exe %d";
1046 }
1047
1048
1049 /**
1050  * Handle a fatal signal by launching a debugger, controlled by $RSYNC_PANIC_ACTION.
1051  *
1052  * This signal handler is only installed if we were configured with
1053  * --enable-maintainer-mode.  Perhaps it should always be on and we
1054  * should just look at the environment variable, but I'm a bit leery
1055  * of a signal sending us into a busy loop.
1056  **/
1057 static RETSIGTYPE rsync_panic_handler(UNUSED(int whatsig))
1058 {
1059         char cmd_buf[300];
1060         int ret;
1061
1062         sprintf(cmd_buf, get_panic_action(),
1063                 getpid(), getpid());
1064
1065         /* Unless we failed to execute gdb, we allow the process to
1066          * continue.  I'm not sure if that's right. */
1067         ret = system(cmd_buf);
1068         if (ret)
1069                 _exit(ret);
1070 }
1071 #endif
1072
1073
1074 int main(int argc,char *argv[])
1075 {
1076         int ret;
1077         int orig_argc = argc;
1078         char **orig_argv = argv;
1079
1080         signal(SIGUSR1, sigusr1_handler);
1081         signal(SIGUSR2, sigusr2_handler);
1082         signal(SIGCHLD, sigchld_handler);
1083 #ifdef MAINTAINER_MODE
1084         signal(SIGSEGV, rsync_panic_handler);
1085         signal(SIGFPE, rsync_panic_handler);
1086         signal(SIGABRT, rsync_panic_handler);
1087         signal(SIGBUS, rsync_panic_handler);
1088 #endif /* def MAINTAINER_MODE */
1089
1090         starttime = time(NULL);
1091         am_root = (MY_UID() == 0);
1092
1093         memset(&stats, 0, sizeof(stats));
1094
1095         if (argc < 2) {
1096                 usage(FERROR);
1097                 exit_cleanup(RERR_SYNTAX);
1098         }
1099
1100         /* we set a 0 umask so that correct file permissions can be
1101          * carried across */
1102         orig_umask = (int)umask(0);
1103
1104         if (!parse_arguments(&argc, (const char ***) &argv, 1)) {
1105                 /* FIXME: We ought to call the same error-handling
1106                  * code here, rather than relying on getopt. */
1107                 option_error();
1108                 exit_cleanup(RERR_SYNTAX);
1109         }
1110
1111         signal(SIGINT,SIGNAL_CAST sig_int);
1112         signal(SIGHUP,SIGNAL_CAST sig_int);
1113         signal(SIGTERM,SIGNAL_CAST sig_int);
1114
1115         /* Ignore SIGPIPE; we consistently check error codes and will
1116          * see the EPIPE. */
1117         signal(SIGPIPE, SIG_IGN);
1118
1119         /* Initialize push_dir here because on some old systems getcwd
1120          * (implemented by forking "pwd" and reading its output) doesn't
1121          * work when there are other child processes.  Also, on all systems
1122          * that implement getcwd that way "pwd" can't be found after chroot. */
1123         push_dir(NULL);
1124
1125         init_flist();
1126
1127         if (write_batch || read_batch) {
1128                 if (write_batch)
1129                         write_batch_shell_file(orig_argc, orig_argv, argc);
1130
1131                 if (read_batch && strcmp(batch_name, "-") == 0)
1132                         batch_fd = STDIN_FILENO;
1133                 else {
1134                         batch_fd = do_open(batch_name,
1135                                    write_batch ? O_WRONLY | O_CREAT | O_TRUNC
1136                                    : O_RDONLY, S_IRUSR | S_IWUSR);
1137                 }
1138                 if (batch_fd < 0) {
1139                         rsyserr(FERROR, errno, "Batch file %s open error",
1140                                 full_fname(batch_name));
1141                         exit_cleanup(RERR_FILEIO);
1142                 }
1143                 if (read_batch)
1144                         read_stream_flags(batch_fd);
1145         }
1146
1147         if (am_daemon && !am_server)
1148                 return daemon_main();
1149
1150         if (argc < 1) {
1151                 usage(FERROR);
1152                 exit_cleanup(RERR_SYNTAX);
1153         }
1154
1155         if (am_server) {
1156                 set_nonblocking(STDIN_FILENO);
1157                 set_nonblocking(STDOUT_FILENO);
1158                 if (am_daemon)
1159                         return start_daemon(STDIN_FILENO, STDOUT_FILENO);
1160                 start_server(STDIN_FILENO, STDOUT_FILENO, argc, argv);
1161         }
1162
1163         ret = start_client(argc, argv);
1164         if (ret == -1)
1165                 exit_cleanup(RERR_STARTCLIENT);
1166         else
1167                 exit_cleanup(ret);
1168
1169         return ret;
1170 }