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
  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 #ifdef 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 #ifdef 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 ", safe_fname(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", safe_fname(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 /* This is only called by the sender. */
 432 static void read_final_goodbye(int f_in, int f_out, int flist_count)
 433 {
 434         int i;
 435
 436         if (protocol_version < 29)
 437                 i = read_int(f_in);
 438         else {
 439                 while ((i = read_int(f_in)) == flist_count
 440                     && read_shortint(f_in) == ITEM_IS_NEW) {
 441                         /* Forward the keep-alive (no-op) to the receiver. */
 442                         write_int(f_out, flist_count);
 443                         write_shortint(f_out, ITEM_IS_NEW);
 444                 }
 445         }
 446
 447         if (i != -1) {
 448                 rprintf(FERROR, "Invalid packet from generator at end of run.\n");
 449                 exit_cleanup(RERR_PROTOCOL);
 450         }
 451 }
 452
 453
 454 static void do_server_sender(int f_in, int f_out, int argc,char *argv[])
 455 {
 456         int i;
 457         struct file_list *flist;
 458         char *dir = argv[0];
 459
 460         if (verbose > 2) {
 461                 rprintf(FINFO, "server_sender starting pid=%ld\n",
 462                         (long)getpid());
 463         }
 464
 465         if (am_daemon && lp_write_only(module_id)) {
 466                 rprintf(FERROR, "ERROR: module is write only\n");
 467                 exit_cleanup(RERR_SYNTAX);
 468                 return;
 469         }
 470         if (am_daemon && lp_read_only(module_id) && remove_sent_files) {
 471                 rprintf(FERROR,
 472                     "ERROR: --remove-sent-files cannot be used with a read-only module\n");
 473                 exit_cleanup(RERR_SYNTAX);
 474                 return;
 475         }
 476
 477         if (!relative_paths && !push_dir(dir)) {
 478                 rsyserr(FERROR, errno, "push_dir#3 %s failed",
 479                         full_fname(dir));
 480                 exit_cleanup(RERR_FILESELECT);
 481         }
 482         argc--;
 483         argv++;
 484
 485         if (strcmp(dir,".")) {
 486                 int l = strlen(dir);
 487                 if (strcmp(dir,"/") == 0)
 488                         l = 0;
 489                 for (i = 0; i < argc; i++)
 490                         argv[i] += l+1;
 491         }
 492
 493         if (argc == 0 && (recurse || list_only)) {
 494                 argc = 1;
 495                 argv--;
 496                 argv[0] = ".";
 497         }
 498
 499         flist = send_file_list(f_out,argc,argv);
 500         if (!flist || flist->count == 0) {
 501                 exit_cleanup(0);
 502         }
 503
 504         io_start_buffering_in();
 505         io_start_buffering_out();
 506
 507         send_files(flist,f_out,f_in);
 508         io_flush(FULL_FLUSH);
 509         report(f_out);
 510         if (protocol_version >= 24)
 511                 read_final_goodbye(f_in, f_out, flist->count);
 512         io_flush(FULL_FLUSH);
 513         exit_cleanup(0);
 514 }
 515
 516
 517 static int do_recv(int f_in,int f_out,struct file_list *flist,char *local_name)
 518 {
 519         int pid;
 520         int status = 0;
 521         int error_pipe[2], name_pipe[2];
 522         BOOL need_name_pipe = (basis_dir[0] || partial_dir || fuzzy_basis
 523                             || (inplace && make_backups)) && !dry_run;
 524
 525         /* The receiving side mustn't obey this, or an existing symlink that
 526          * points to an identical file won't be replaced by the referent. */
 527         copy_links = 0;
 528
 529         if (preserve_hard_links)
 530                 init_hard_links(flist);
 531
 532         if (fd_pair(error_pipe) < 0
 533             || (need_name_pipe && fd_pair(name_pipe) < 0)) {
 534                 rsyserr(FERROR, errno, "pipe failed in do_recv");
 535                 exit_cleanup(RERR_IPC);
 536         }
 537
 538         io_flush(NORMAL_FLUSH);
 539
 540         if ((pid = do_fork()) == -1) {
 541                 rsyserr(FERROR, errno, "fork failed in do_recv");
 542                 exit_cleanup(RERR_IPC);
 543         }
 544
 545         if (pid == 0) {
 546                 close(error_pipe[0]);
 547                 if (need_name_pipe) {
 548                         close(name_pipe[1]);
 549                         set_blocking(name_pipe[0]);
 550                 } else
 551                         name_pipe[0] = -1;
 552                 if (f_in != f_out)
 553                         close(f_out);
 554
 555                 /* we can't let two processes write to the socket at one time */
 556                 close_multiplexing_out();
 557
 558                 /* set place to send errors */
 559                 set_msg_fd_out(error_pipe[1]);
 560
 561                 recv_files(f_in, flist, local_name, name_pipe[0]);
 562                 io_flush(FULL_FLUSH);
 563                 report(f_in);
 564
 565                 send_msg(MSG_DONE, "", 0);
 566                 io_flush(FULL_FLUSH);
 567
 568                 /* Handle any keep-alive packets from the post-processing work
 569                  * that the generator does. */
 570                 if (protocol_version >= 29) {
 571                         kluge_around_eof = -1;
 572
 573                         /* This should only get stopped via a USR2 signal. */
 574                         while (read_int(f_in) == flist->count
 575                             && read_shortint(f_in) == ITEM_IS_NEW) {}
 576
 577                         rprintf(FERROR, "Invalid packet from server at end of run.\n");
 578                         exit_cleanup(RERR_PROTOCOL);
 579                 }
 580
 581                 /* Finally, we go to sleep until our parent kills us with a
 582                  * USR2 signal.  We sleep for a short time, as on some OSes
 583                  * a signal won't interrupt a sleep! */
 584                 while (1)
 585                         msleep(20);
 586         }
 587
 588         am_generator = 1;
 589         close_multiplexing_in();
 590         if (write_batch)
 591                 stop_write_batch();
 592
 593         close(error_pipe[1]);
 594         if (need_name_pipe) {
 595                 close(name_pipe[0]);
 596                 set_nonblocking(name_pipe[1]);
 597         } else
 598                 name_pipe[1] = -1;
 599         if (f_in != f_out)
 600                 close(f_in);
 601
 602         io_start_buffering_out();
 603
 604         set_msg_fd_in(error_pipe[0]);
 605
 606         generate_files(f_out, flist, local_name, name_pipe[1]);
 607
 608         report(-1);
 609         io_flush(FULL_FLUSH);
 610         if (protocol_version >= 24) {
 611                 /* send a final goodbye message */
 612                 write_int(f_out, -1);
 613         }
 614         io_flush(FULL_FLUSH);
 615
 616         set_msg_fd_in(-1);
 617         kill(pid, SIGUSR2);
 618         wait_process(pid, &status);
 619         return status;
 620 }
 621
 622
 623 static void do_server_recv(int f_in, int f_out, int argc,char *argv[])
 624 {
 625         int status;
 626         struct file_list *flist;
 627         char *local_name = NULL;
 628         char *dir = NULL;
 629         int save_verbose = verbose;
 630
 631         if (filesfrom_fd >= 0) {
 632                 /* We can't mix messages with files-from data on the socket,
 633                  * so temporarily turn off verbose messages. */
 634                 verbose = 0;
 635         }
 636
 637         if (verbose > 2) {
 638                 rprintf(FINFO, "server_recv(%d) starting pid=%ld\n",
 639                         argc, (long)getpid());
 640         }
 641
 642         if (am_daemon && lp_read_only(module_id)) {
 643                 rprintf(FERROR,"ERROR: module is read only\n");
 644                 exit_cleanup(RERR_SYNTAX);
 645                 return;
 646         }
 647
 648
 649         if (argc > 0) {
 650                 dir = argv[0];
 651                 argc--;
 652                 argv++;
 653                 if (!am_daemon && !push_dir(dir)) {
 654                         rsyserr(FERROR, errno, "push_dir#4 %s failed",
 655                                 full_fname(dir));
 656                         exit_cleanup(RERR_FILESELECT);
 657                 }
 658         }
 659
 660         io_start_buffering_in();
 661         recv_filter_list(f_in);
 662
 663         if (filesfrom_fd >= 0) {
 664                 /* We need to send the files-from names to the sender at the
 665                  * same time that we receive the file-list from them, so we
 666                  * need the IO routines to automatically write out the names
 667                  * onto our f_out socket as we read the file-list.  This
 668                  * avoids both deadlock and extra delays/buffers. */
 669                 io_set_filesfrom_fds(filesfrom_fd, f_out);
 670                 filesfrom_fd = -1;
 671         }
 672
 673         flist = recv_file_list(f_in);
 674         verbose = save_verbose;
 675         if (!flist) {
 676                 rprintf(FERROR,"server_recv: recv_file_list error\n");
 677                 exit_cleanup(RERR_FILESELECT);
 678         }
 679
 680         if (argc > 0) {
 681                 if (strcmp(dir,".")) {
 682                         argv[0] += strlen(dir);
 683                         if (argv[0][0] == '/')
 684                                 argv[0]++;
 685                 }
 686                 local_name = get_local_name(flist,argv[0]);
 687         }
 688
 689         status = do_recv(f_in,f_out,flist,local_name);
 690         exit_cleanup(status);
 691 }
 692
 693
 694 int child_main(int argc, char *argv[])
 695 {
 696         start_server(STDIN_FILENO, STDOUT_FILENO, argc, argv);
 697         return 0;
 698 }
 699
 700
 701 void start_server(int f_in, int f_out, int argc, char *argv[])
 702 {
 703         set_nonblocking(f_in);
 704         set_nonblocking(f_out);
 705
 706         io_set_sock_fds(f_in, f_out);
 707         setup_protocol(f_out, f_in);
 708
 709         if (protocol_version >= 23)
 710                 io_start_multiplex_out();
 711
 712         if (am_sender) {
 713                 keep_dirlinks = 0; /* Must be disabled on the sender. */
 714                 if (need_messages_from_generator)
 715                         io_start_multiplex_in();
 716
 717                 recv_filter_list(f_in);
 718                 do_server_sender(f_in, f_out, argc, argv);
 719         } else {
 720                 do_server_recv(f_in, f_out, argc, argv);
 721         }
 722         exit_cleanup(0);
 723 }
 724
 725
 726 /*
 727  * This is called once the connection has been negotiated.  It is used
 728  * for rsyncd, remote-shell, and local connections.
 729  */
 730 int client_run(int f_in, int f_out, pid_t pid, int argc, char *argv[])
 731 {
 732         struct file_list *flist = NULL;
 733         int status = 0, status2 = 0;
 734         char *local_name = NULL;
 735
 736         cleanup_child_pid = pid;
 737         if (!read_batch) {
 738                 set_nonblocking(f_in);
 739                 set_nonblocking(f_out);
 740         }
 741
 742         io_set_sock_fds(f_in, f_out);
 743         setup_protocol(f_out,f_in);
 744
 745         if (protocol_version >= 23 && !read_batch)
 746                 io_start_multiplex_in();
 747
 748         /* We set our stderr file handle to blocking because ssh might have
 749          * set it to non-blocking.  This can be particularly troublesome if
 750          * stderr is a clone of stdout, because ssh would have set our stdout
 751          * to non-blocking at the same time (which can easily cause us to lose
 752          * output from our print statements).  This kluge shouldn't cause ssh
 753          * any problems for how we use it.  Note also that we delayed setting
 754          * this until after the above protocol setup so that we know for sure
 755          * that ssh is done twiddling its file descriptors.  */
 756         set_blocking(STDERR_FILENO);
 757
 758         if (am_sender) {
 759                 keep_dirlinks = 0; /* Must be disabled on the sender. */
 760                 io_start_buffering_out();
 761                 if (!filesfrom_host)
 762                         set_msg_fd_in(f_in);
 763                 send_filter_list(f_out);
 764                 if (filesfrom_host)
 765                         filesfrom_fd = f_in;
 766
 767                 if (write_batch)
 768                         start_write_batch(f_out);
 769                 if (!read_batch) /* don't write to pipe */
 770                         flist = send_file_list(f_out,argc,argv);
 771                 set_msg_fd_in(-1);
 772                 if (verbose > 3)
 773                         rprintf(FINFO,"file list sent\n");
 774
 775                 io_flush(NORMAL_FLUSH);
 776                 send_files(flist,f_out,f_in);
 777                 io_flush(FULL_FLUSH);
 778                 if (protocol_version >= 24)
 779                         read_final_goodbye(f_in, f_out, flist->count);
 780                 if (pid != -1) {
 781                         if (verbose > 3)
 782                                 rprintf(FINFO,"client_run waiting on %d\n", (int) pid);
 783                         io_flush(FULL_FLUSH);
 784                         wait_process(pid, &status);
 785                 }
 786                 report(-1);
 787                 io_flush(FULL_FLUSH);
 788                 exit_cleanup(status);
 789         }
 790
 791         if (need_messages_from_generator && !read_batch)
 792                 io_start_multiplex_out();
 793
 794         if (argc == 0)
 795                 list_only |= 1;
 796
 797         send_filter_list(read_batch ? -1 : f_out);
 798
 799         if (filesfrom_fd >= 0) {
 800                 io_set_filesfrom_fds(filesfrom_fd, f_out);
 801                 filesfrom_fd = -1;
 802         }
 803
 804         if (write_batch)
 805                 start_write_batch(f_in);
 806         flist = recv_file_list(f_in);
 807         if (!flist || flist->count == 0) {
 808                 rprintf(FINFO, "client: nothing to do: "
 809                         "perhaps you need to specify some filenames or "
 810                         "the --recursive option?\n");
 811                 exit_cleanup(0);
 812         }
 813
 814         local_name = get_local_name(flist,argv[0]);
 815
 816         status2 = do_recv(f_in,f_out,flist,local_name);
 817
 818         if (pid != -1) {
 819                 if (verbose > 3)
 820                         rprintf(FINFO,"client_run2 waiting on %d\n", (int) pid);
 821                 io_flush(FULL_FLUSH);
 822                 wait_process(pid, &status);
 823         }
 824
 825         return MAX(status, status2);
 826 }
 827
 828 static int copy_argv (char *argv[])
 829 {
 830         int i;
 831
 832         for (i = 0; argv[i]; i++) {
 833                 if (!(argv[i] = strdup(argv[i]))) {
 834                         rprintf (FERROR, "out of memory at %s(%d)\n",
 835                                  __FILE__, __LINE__);
 836                         return RERR_MALLOC;
 837                 }
 838         }
 839
 840         return 0;
 841 }
 842
 843
 844 /**
 845  * Start a client for either type of remote connection.  Work out
 846  * whether the arguments request a remote shell or rsyncd connection,
 847  * and call the appropriate connection function, then run_client.
 848  *
 849  * Calls either start_socket_client (for sockets) or do_cmd and
 850  * client_run (for ssh).
 851  **/
 852 static int start_client(int argc, char *argv[])
 853 {
 854         char *p;
 855         char *shell_machine = NULL;
 856         char *shell_path = NULL;
 857         char *shell_user = NULL;
 858         int ret;
 859         pid_t pid;
 860         int f_in,f_out;
 861         int rc;
 862
 863         /* Don't clobber argv[] so that ps(1) can still show the right
 864          * command line. */
 865         if ((rc = copy_argv(argv)))
 866                 return rc;
 867
 868         if (!read_batch) { /* for read_batch, NO source is specified */
 869                 argc--;
 870                 shell_path = check_for_hostspec(argv[0], &shell_machine, &rsync_port);
 871                 if (shell_path) { /* source is remote */
 872                         argv++;
 873                         if (filesfrom_host && *filesfrom_host
 874                             && strcmp(filesfrom_host, shell_machine) != 0) {
 875                                 rprintf(FERROR,
 876                                         "--files-from hostname is not the same as the transfer hostname\n");
 877                                 exit_cleanup(RERR_SYNTAX);
 878                         }
 879                         if (rsync_port) {
 880                                 if (!shell_cmd) {
 881                                         return start_socket_client(shell_machine,
 882                                                                    shell_path,
 883                                                                    argc, argv);
 884                                 }
 885                                 daemon_over_rsh = 1;
 886                         }
 887
 888                         am_sender = 0;
 889                 } else { /* source is local, check dest arg */
 890                         am_sender = 1;
 891
 892                         if (argc < 1) { /* destination required */
 893                                 usage(FERROR);
 894                                 exit_cleanup(RERR_SYNTAX);
 895                         }
 896
 897                         shell_path = check_for_hostspec(argv[argc], &shell_machine, &rsync_port);
 898                         if (shell_path && filesfrom_host && *filesfrom_host
 899                             && strcmp(filesfrom_host, shell_machine) != 0) {
 900                                 rprintf(FERROR,
 901                                         "--files-from hostname is not the same as the transfer hostname\n");
 902                                 exit_cleanup(RERR_SYNTAX);
 903                         }
 904                         if (!shell_path) { /* no hostspec found, so src & dest are local */
 905                                 local_server = 1;
 906                                 if (filesfrom_host) {
 907                                         rprintf(FERROR,
 908                                                 "--files-from cannot be remote when the transfer is local\n");
 909                                         exit_cleanup(RERR_SYNTAX);
 910                                 }
 911                                 shell_machine = NULL;
 912                                 shell_path = argv[argc];
 913                         } else if (rsync_port) {
 914                                 if (!shell_cmd) {
 915                                         return start_socket_client(shell_machine,
 916                                                                    shell_path,
 917                                                                    argc, argv);
 918                                 }
 919                                 daemon_over_rsh = 1;
 920                         }
 921                 }
 922         } else {  /* read_batch */
 923                 local_server = 1;
 924                 shell_path = argv[argc-1];
 925                 if (check_for_hostspec(shell_path, &shell_machine, &rsync_port)) {
 926                         rprintf(FERROR, "remote destination is not allowed with --read-batch\n");
 927                         exit_cleanup(RERR_SYNTAX);
 928                 }
 929         }
 930
 931         if (shell_machine) {
 932                 p = strrchr(shell_machine,'@');
 933                 if (p) {
 934                         *p = 0;
 935                         shell_user = shell_machine;
 936                         shell_machine = p+1;
 937                 }
 938         }
 939
 940         if (verbose > 3) {
 941                 rprintf(FINFO,"cmd=%s machine=%s user=%s path=%s\n",
 942                         shell_cmd ? safe_fname(shell_cmd) : "",
 943                         shell_machine ? safe_fname(shell_machine) : "",
 944                         shell_user ? safe_fname(shell_user) : "",
 945                         shell_path ? safe_fname(shell_path) : "");
 946         }
 947
 948         /* for remote source, only single dest arg can remain ... */
 949         if (!am_sender && argc > 1) {
 950                 usage(FERROR);
 951                 exit_cleanup(RERR_SYNTAX);
 952         }
 953
 954         /* ... or no dest at all */
 955         if (!am_sender && argc == 0)
 956                 list_only |= 1;
 957
 958         pid = do_cmd(shell_cmd,shell_machine,shell_user,shell_path,
 959                      &f_in,&f_out);
 960
 961         /* if we're running an rsync server on the remote host over a
 962          * remote shell command, we need to do the RSYNCD protocol first */
 963         if (daemon_over_rsh) {
 964                 int tmpret;
 965                 tmpret = start_inband_exchange(shell_user, shell_path,
 966                                                f_in, f_out, argc);
 967                 if (tmpret < 0)
 968                         return tmpret;
 969         }
 970
 971         ret = client_run(f_in, f_out, pid, argc, argv);
 972
 973         fflush(stdout);
 974         fflush(stderr);
 975
 976         return ret;
 977 }
 978
 979
 980 static RETSIGTYPE sigusr1_handler(UNUSED(int val))
 981 {
 982         exit_cleanup(RERR_SIGNAL);
 983 }
 984
 985 static RETSIGTYPE sigusr2_handler(UNUSED(int val))
 986 {
 987         close_all();
 988         if (log_got_error) _exit(RERR_PARTIAL);
 989         _exit(0);
 990 }
 991
 992 static RETSIGTYPE sigchld_handler(UNUSED(int val))
 993 {
 994 #ifdef WNOHANG
 995         int cnt, status;
 996         pid_t pid;
 997         /* An empty waitpid() loop was put here by Tridge and we could never
 998          * get him to explain why he put it in, so rather than taking it
 999          * out we're instead saving the child exit statuses for later use.
1000          * The waitpid() loop presumably eliminates all possibility of leaving
1001          * zombie children, maybe that's why he did it.
1002          */
1003         while ((pid = waitpid(-1, &status, WNOHANG)) > 0) {
1004                 /* save the child's exit status */
1005                 for (cnt = 0; cnt < MAXCHILDPROCS; cnt++) {
1006                         if (pid_stat_table[cnt].pid == 0) {
1007                                 pid_stat_table[cnt].pid = pid;
1008                                 pid_stat_table[cnt].status = status;
1009                                 break;
1010                         }
1011                 }
1012         }
1013 #endif
1014 }
1015
1016
1017 /**
1018  * This routine catches signals and tries to send them to gdb.
1019  *
1020  * Because it's called from inside a signal handler it ought not to
1021  * use too many library routines.
1022  *
1023  * @todo Perhaps use "screen -X" instead/as well, to help people
1024  * debugging without easy access to X.  Perhaps use an environment
1025  * variable, or just call a script?
1026  *
1027  * @todo The /proc/ magic probably only works on Linux (and
1028  * Solaris?)  Can we be more portable?
1029  **/
1030 #ifdef MAINTAINER_MODE
1031 const char *get_panic_action(void)
1032 {
1033         const char *cmd_fmt = getenv("RSYNC_PANIC_ACTION");
1034
1035         if (cmd_fmt)
1036                 return cmd_fmt;
1037         else
1038                 return "xterm -display :0 -T Panic -n Panic "
1039                         "-e gdb /proc/%d/exe %d";
1040 }
1041
1042
1043 /**
1044  * Handle a fatal signal by launching a debugger, controlled by $RSYNC_PANIC_ACTION.
1045  *
1046  * This signal handler is only installed if we were configured with
1047  * --enable-maintainer-mode.  Perhaps it should always be on and we
1048  * should just look at the environment variable, but I'm a bit leery
1049  * of a signal sending us into a busy loop.
1050  **/
1051 static RETSIGTYPE rsync_panic_handler(UNUSED(int whatsig))
1052 {
1053         char cmd_buf[300];
1054         int ret;
1055
1056         sprintf(cmd_buf, get_panic_action(),
1057                 getpid(), getpid());
1058
1059         /* Unless we failed to execute gdb, we allow the process to
1060          * continue.  I'm not sure if that's right. */
1061         ret = system(cmd_buf);
1062         if (ret)
1063                 _exit(ret);
1064 }
1065 #endif
1066
1067
1068 int main(int argc,char *argv[])
1069 {
1070         int ret;
1071         int orig_argc = argc;
1072         char **orig_argv = argv;
1073
1074         signal(SIGUSR1, sigusr1_handler);
1075         signal(SIGUSR2, sigusr2_handler);
1076         signal(SIGCHLD, sigchld_handler);
1077 #ifdef MAINTAINER_MODE
1078         signal(SIGSEGV, rsync_panic_handler);
1079         signal(SIGFPE, rsync_panic_handler);
1080         signal(SIGABRT, rsync_panic_handler);
1081         signal(SIGBUS, rsync_panic_handler);
1082 #endif /* def MAINTAINER_MODE */
1083
1084         starttime = time(NULL);
1085         am_root = (MY_UID() == 0);
1086
1087         memset(&stats, 0, sizeof(stats));
1088
1089         if (argc < 2) {
1090                 usage(FERROR);
1091                 exit_cleanup(RERR_SYNTAX);
1092         }
1093
1094         /* we set a 0 umask so that correct file permissions can be
1095          * carried across */
1096         orig_umask = (int)umask(0);
1097
1098         if (!parse_arguments(&argc, (const char ***) &argv, 1)) {
1099                 /* FIXME: We ought to call the same error-handling
1100                  * code here, rather than relying on getopt. */
1101                 option_error();
1102                 exit_cleanup(RERR_SYNTAX);
1103         }
1104
1105         signal(SIGINT,SIGNAL_CAST sig_int);
1106         signal(SIGHUP,SIGNAL_CAST sig_int);
1107         signal(SIGTERM,SIGNAL_CAST sig_int);
1108
1109         /* Ignore SIGPIPE; we consistently check error codes and will
1110          * see the EPIPE. */
1111         signal(SIGPIPE, SIG_IGN);
1112
1113         /* Initialize push_dir here because on some old systems getcwd
1114          * (implemented by forking "pwd" and reading its output) doesn't
1115          * work when there are other child processes.  Also, on all systems
1116          * that implement getcwd that way "pwd" can't be found after chroot. */
1117         push_dir(NULL);
1118
1119         init_flist();
1120
1121         if (write_batch || read_batch) {
1122                 if (write_batch)
1123                         write_batch_shell_file(orig_argc, orig_argv, argc);
1124
1125                 if (read_batch && strcmp(batch_name, "-") == 0)
1126                         batch_fd = STDIN_FILENO;
1127                 else {
1128                         batch_fd = do_open(batch_name,
1129                                    write_batch ? O_WRONLY | O_CREAT | O_TRUNC
1130                                    : O_RDONLY, S_IRUSR | S_IWUSR);
1131                 }
1132                 if (batch_fd < 0) {
1133                         rsyserr(FERROR, errno, "Batch file %s open error",
1134                                 full_fname(batch_name));
1135                         exit_cleanup(RERR_FILEIO);
1136                 }
1137                 if (read_batch)
1138                         read_stream_flags(batch_fd);
1139         }
1140
1141         if (am_daemon && !am_server)
1142                 return daemon_main();
1143
1144         if (argc < 1) {
1145                 usage(FERROR);
1146                 exit_cleanup(RERR_SYNTAX);
1147         }
1148
1149         if (am_server) {
1150                 set_nonblocking(STDIN_FILENO);
1151                 set_nonblocking(STDOUT_FILENO);
1152                 if (am_daemon)
1153                         return start_daemon(STDIN_FILENO, STDOUT_FILENO);
1154                 start_server(STDIN_FILENO, STDOUT_FILENO, argc, argv);
1155         }
1156
1157         ret = start_client(argc, argv);
1158         if (ret == -1)
1159                 exit_cleanup(RERR_STARTCLIENT);
1160         else
1161                 exit_cleanup(ret);
1162
1163         return ret;
1164 }