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 #if defined CONFIG_LOCALE && defined HAVE_LOCALE_H
  24 #include <locale.h>
  25 #endif
  26
  27 extern int verbose;
  28 extern int dry_run;
  29 extern int list_only;
  30 extern int am_root;
  31 extern int am_server;
  32 extern int am_sender;
  33 extern int am_generator;
  34 extern int am_daemon;
  35 extern int blocking_io;
  36 extern int remove_sent_files;
  37 extern int daemon_over_rsh;
  38 extern int need_messages_from_generator;
  39 extern int kluge_around_eof;
  40 extern int do_stats;
  41 extern int log_got_error;
  42 extern int module_id;
  43 extern int orig_umask;
  44 extern int copy_links;
  45 extern int keep_dirlinks;
  46 extern int preserve_hard_links;
  47 extern int protocol_version;
  48 extern int always_checksum;
  49 extern int recurse;
  50 extern int relative_paths;
  51 extern int rsync_port;
  52 extern int whole_file;
  53 extern int read_batch;
  54 extern int write_batch;
  55 extern int batch_fd;
  56 extern int batch_gen_fd;
  57 extern int filesfrom_fd;
  58 extern pid_t cleanup_child_pid;
  59 extern struct stats stats;
  60 extern char *filesfrom_host;
  61 extern char *rsync_path;
  62 extern char *shell_cmd;
  63 extern char *batch_name;
  64 extern char curr_dir[MAXPATHLEN];
  65
  66 int local_server = 0;
  67 int pre_checksum = 0;
  68 struct file_list *the_file_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 time_t starttime, endtime;
  80 static int64 total_read, total_written;
  81
  82 static void show_malloc_stats(void);
  83
  84 /****************************************************************************
  85 wait for a process to exit, calling io_flush while waiting
  86 ****************************************************************************/
  87 static void wait_process(pid_t pid, int *code_ptr)
  88 {
  89         pid_t waited_pid;
  90         int cnt, status;
  91
  92         while ((waited_pid = waitpid(pid, &status, WNOHANG)) == 0) {
  93                 msleep(20);
  94                 io_flush(FULL_FLUSH);
  95         }
  96
  97         if (waited_pid == -1 && errno == ECHILD) {
  98                 /* status of requested child no longer available.
  99                  * check to see if it was processed by the sigchld_handler.
 100                  */
 101                 for (cnt = 0;  cnt < MAXCHILDPROCS; cnt++) {
 102                         if (pid == pid_stat_table[cnt].pid) {
 103                                 waited_pid = pid;
 104                                 status = pid_stat_table[cnt].status;
 105                                 pid_stat_table[cnt].pid = 0;
 106                                 break;
 107                         }
 108                 }
 109         }
 110
 111         /* TODO: If the child exited on a signal, then log an
 112          * appropriate error message.  Perhaps we should also accept a
 113          * message describing the purpose of the child.  Also indicate
 114          * this to the caller so that they know something went wrong. */
 115         if (waited_pid < 0)
 116                 *code_ptr = RERR_WAITCHILD;
 117         else if (!WIFEXITED(status)) {
 118 #ifdef WCOREDUMP
 119                 if (WCOREDUMP(status))
 120                         *code_ptr = RERR_CRASHED;
 121                 else
 122 #endif
 123                 if (WIFSIGNALED(status))
 124                         *code_ptr = RERR_TERMINATED;
 125                 else
 126                         *code_ptr = RERR_WAITCHILD;
 127         } else
 128                 *code_ptr = WEXITSTATUS(status);
 129 }
 130
 131 /* This function gets called from all 3 processes.  We want the client side
 132  * to actually output the text, but the sender is the only process that has
 133  * all the stats we need.  So, if we're a client sender, we do the report.
 134  * If we're a server sender, we write the stats on the supplied fd.  If
 135  * we're the client receiver we read the stats from the supplied fd and do
 136  * the report.  All processes might also generate a set of debug stats, if
 137  * the verbose level is high enough (this is the only thing that the
 138  * generator process and the server receiver ever do here). */
 139 static void handle_stats(int f)
 140 {
 141         endtime = time(NULL);
 142
 143         /* Cache two stats because the read/write code can change it. */
 144         total_read = stats.total_read;
 145         total_written = stats.total_written;
 146
 147         if (do_stats && verbose > 1) {
 148                 /* These come out from every process */
 149                 show_malloc_stats();
 150                 show_flist_stats();
 151         }
 152
 153         if (am_generator)
 154                 return;
 155
 156         if (am_daemon) {
 157                 log_exit(0, __FILE__, __LINE__);
 158                 if (f == -1 || !am_sender)
 159                         return;
 160         }
 161
 162         if (am_server) {
 163                 if (am_sender) {
 164                         write_longint(f, total_read);
 165                         write_longint(f, total_written);
 166                         write_longint(f, stats.total_size);
 167                         if (protocol_version >= 29) {
 168                                 write_longint(f, stats.flist_buildtime);
 169                                 write_longint(f, stats.flist_xfertime);
 170                         }
 171                 }
 172                 return;
 173         }
 174
 175         /* this is the client */
 176
 177         if (f < 0 && !am_sender) /* e.g. when we got an empty file list. */
 178                 ;
 179         else if (!am_sender) {
 180                 /* Read the first two in opposite order because the meaning of
 181                  * read/write swaps when switching from sender to receiver. */
 182                 total_written = read_longint(f);
 183                 total_read = read_longint(f);
 184                 stats.total_size = read_longint(f);
 185                 if (protocol_version >= 29) {
 186                         stats.flist_buildtime = read_longint(f);
 187                         stats.flist_xfertime = read_longint(f);
 188                 }
 189         } else if (write_batch) {
 190                 /* The --read-batch process is going to be a client
 191                  * receiver, so we need to give it the stats. */
 192                 write_longint(batch_fd, total_read);
 193                 write_longint(batch_fd, total_written);
 194                 write_longint(batch_fd, stats.total_size);
 195                 if (protocol_version >= 29) {
 196                         write_longint(batch_fd, stats.flist_buildtime);
 197                         write_longint(batch_fd, stats.flist_xfertime);
 198                 }
 199         }
 200 }
 201
 202 static void output_summary(void)
 203 {
 204         if (do_stats) {
 205                 rprintf(FINFO,"\nNumber of files: %d\n", stats.num_files);
 206                 rprintf(FINFO,"Number of files transferred: %d\n",
 207                         stats.num_transferred_files);
 208                 rprintf(FINFO,"Total file size: %.0f bytes\n",
 209                         (double)stats.total_size);
 210                 rprintf(FINFO,"Total transferred file size: %.0f bytes\n",
 211                         (double)stats.total_transferred_size);
 212                 rprintf(FINFO,"Literal data: %.0f bytes\n",
 213                         (double)stats.literal_data);
 214                 rprintf(FINFO,"Matched data: %.0f bytes\n",
 215                         (double)stats.matched_data);
 216                 rprintf(FINFO,"File list size: %d\n", stats.flist_size);
 217                 if (stats.flist_buildtime) {
 218                         rprintf(FINFO,
 219                                 "File list generation time: %.3f seconds\n",
 220                                 (double)stats.flist_buildtime / 1000);
 221                         rprintf(FINFO,
 222                                 "File list transfer time: %.3f seconds\n",
 223                                 (double)stats.flist_xfertime / 1000);
 224                 }
 225                 rprintf(FINFO,"Total bytes sent: %.0f\n",
 226                         (double)total_written);
 227                 rprintf(FINFO,"Total bytes received: %.0f\n",
 228                         (double)total_read);
 229         }
 230
 231         if (verbose || do_stats) {
 232                 rprintf(FINFO,
 233                         "\nsent %.0f bytes  received %.0f bytes  %.2f bytes/sec\n",
 234                         (double)total_written, (double)total_read,
 235                         (total_written + total_read)/(0.5 + (endtime - starttime)));
 236                 rprintf(FINFO, "total size is %.0f  speedup is %.2f\n",
 237                         (double)stats.total_size,
 238                         (double)stats.total_size / (total_written+total_read));
 239         }
 240
 241         fflush(stdout);
 242         fflush(stderr);
 243 }
 244
 245
 246 /**
 247  * If our C library can get malloc statistics, then show them to FINFO
 248  **/
 249 static void show_malloc_stats(void)
 250 {
 251 #ifdef HAVE_MALLINFO
 252         struct mallinfo mi;
 253
 254         mi = mallinfo();
 255
 256         rprintf(FINFO, "\n" RSYNC_NAME "[%d] (%s%s%s) heap statistics:\n",
 257                 getpid(), am_server ? "server " : "",
 258                 am_daemon ? "daemon " : "", who_am_i());
 259         rprintf(FINFO, "  arena:     %10ld   (bytes from sbrk)\n",
 260                 (long)mi.arena);
 261         rprintf(FINFO, "  ordblks:   %10ld   (chunks not in use)\n",
 262                 (long)mi.ordblks);
 263         rprintf(FINFO, "  smblks:    %10ld\n",
 264                 (long)mi.smblks);
 265         rprintf(FINFO, "  hblks:     %10ld   (chunks from mmap)\n",
 266                 (long)mi.hblks);
 267         rprintf(FINFO, "  hblkhd:    %10ld   (bytes from mmap)\n",
 268                 (long)mi.hblkhd);
 269         rprintf(FINFO, "  allmem:    %10ld   (bytes from sbrk + mmap)\n",
 270                 (long)mi.arena + mi.hblkhd);
 271         rprintf(FINFO, "  usmblks:   %10ld\n",
 272                 (long)mi.usmblks);
 273         rprintf(FINFO, "  fsmblks:   %10ld\n",
 274                 (long)mi.fsmblks);
 275         rprintf(FINFO, "  uordblks:  %10ld   (bytes used)\n",
 276                 (long)mi.uordblks);
 277         rprintf(FINFO, "  fordblks:  %10ld   (bytes free)\n",
 278                 (long)mi.fordblks);
 279         rprintf(FINFO, "  keepcost:  %10ld   (bytes in releasable chunk)\n",
 280                 (long)mi.keepcost);
 281 #endif /* HAVE_MALLINFO */
 282 }
 283
 284
 285 /* Start the remote shell.   cmd may be NULL to use the default. */
 286 static pid_t do_cmd(char *cmd, char *machine, char *user, char *path,
 287                     int *f_in, int *f_out)
 288 {
 289         int i, argc = 0;
 290         char *args[MAX_ARGS];
 291         pid_t ret;
 292         char *tok, *dir = NULL;
 293         int dash_l_set = 0;
 294
 295         if (!read_batch && !local_server) {
 296                 char *rsh_env = getenv(RSYNC_RSH_ENV);
 297                 if (!cmd)
 298                         cmd = rsh_env;
 299                 if (!cmd)
 300                         cmd = RSYNC_RSH;
 301                 cmd = strdup(cmd);
 302                 if (!cmd)
 303                         goto oom;
 304
 305                 for (tok = strtok(cmd, " "); tok; tok = strtok(NULL, " ")) {
 306                         /* Comparison leaves rooms for server_options(). */
 307                         if (argc >= MAX_ARGS - MAX_SERVER_ARGS) {
 308                                 rprintf(FERROR, "internal: args[] overflowed in do_cmd()\n");
 309                                 exit_cleanup(RERR_SYNTAX);
 310                         }
 311                         args[argc++] = tok;
 312                 }
 313
 314                 /* check to see if we've already been given '-l user' in
 315                  * the remote-shell command */
 316                 for (i = 0; i < argc-1; i++) {
 317                         if (!strcmp(args[i], "-l") && args[i+1][0] != '-')
 318                                 dash_l_set = 1;
 319                 }
 320
 321 #ifdef HAVE_REMSH
 322                 /* remsh (on HPUX) takes the arguments the other way around */
 323                 args[argc++] = machine;
 324                 if (user && !(daemon_over_rsh && dash_l_set)) {
 325                         args[argc++] = "-l";
 326                         args[argc++] = user;
 327                 }
 328 #else
 329                 if (user && !(daemon_over_rsh && dash_l_set)) {
 330                         args[argc++] = "-l";
 331                         args[argc++] = user;
 332                 }
 333                 args[argc++] = machine;
 334 #endif
 335
 336                 args[argc++] = rsync_path;
 337
 338                 if (blocking_io < 0) {
 339                         char *cp;
 340                         if ((cp = strrchr(cmd, '/')) != NULL)
 341                                 cp++;
 342                         else
 343                                 cp = cmd;
 344                         if (strcmp(cp, "rsh") == 0 || strcmp(cp, "remsh") == 0)
 345                                 blocking_io = 1;
 346                 }
 347
 348                 server_options(args,&argc);
 349
 350                 if (argc >= MAX_ARGS - 2) {
 351                         rprintf(FERROR, "internal: args[] overflowed in do_cmd()\n");
 352                         exit_cleanup(RERR_SYNTAX);
 353                 }
 354         }
 355
 356         args[argc++] = ".";
 357
 358         if (!daemon_over_rsh && path && *path)
 359                 args[argc++] = path;
 360
 361         args[argc] = NULL;
 362
 363         if (verbose > 3) {
 364                 rprintf(FINFO,"cmd=");
 365                 for (i = 0; i < argc; i++)
 366                         rprintf(FINFO, "%s ", safe_fname(args[i]));
 367                 rprintf(FINFO,"\n");
 368         }
 369
 370         if (read_batch) {
 371                 int from_gen_pipe[2];
 372                 if (fd_pair(from_gen_pipe) < 0) {
 373                         rsyserr(FERROR, errno, "pipe");
 374                         exit_cleanup(RERR_IPC);
 375                 }
 376                 batch_gen_fd = from_gen_pipe[0];
 377                 *f_out = from_gen_pipe[1];
 378                 *f_in = batch_fd;
 379                 ret = -1; /* no child pid */
 380         } else if (local_server) {
 381                 /* If the user didn't request --[no-]whole-file, force
 382                  * it on, but only if we're not batch processing. */
 383                 if (whole_file < 0 && !write_batch)
 384                         whole_file = 1;
 385                 ret = local_child(argc, args, f_in, f_out, child_main);
 386         } else
 387                 ret = piped_child(args,f_in,f_out);
 388
 389         if (dir)
 390                 free(dir);
 391
 392         return ret;
 393
 394 oom:
 395         out_of_memory("do_cmd");
 396         return 0; /* not reached */
 397 }
 398
 399
 400 static char *get_local_name(struct file_list *flist,char *name)
 401 {
 402         STRUCT_STAT st;
 403         int e;
 404
 405         if (verbose > 2)
 406                 rprintf(FINFO,"get_local_name count=%d %s\n",
 407                         flist->count, NS(name));
 408
 409         if (!name)
 410                 return NULL;
 411
 412         if (do_stat(name,&st) == 0) {
 413                 if (S_ISDIR(st.st_mode)) {
 414                         if (!push_dir(name)) {
 415                                 rsyserr(FERROR, errno, "push_dir#1 %s failed",
 416                                         full_fname(name));
 417                                 exit_cleanup(RERR_FILESELECT);
 418                         }
 419                         return NULL;
 420                 }
 421                 if (flist->count > 1) {
 422                         rprintf(FERROR,"ERROR: destination must be a directory when copying more than 1 file\n");
 423                         exit_cleanup(RERR_FILESELECT);
 424                 }
 425                 return name;
 426         }
 427
 428         if (flist->count <= 1 && ((e = strlen(name)) <= 1 || name[e-1] != '/'))
 429                 return name;
 430
 431         if (do_mkdir(name,0777 & ~orig_umask) != 0) {
 432                 rsyserr(FERROR, errno, "mkdir %s failed", full_fname(name));
 433                 exit_cleanup(RERR_FILEIO);
 434         }
 435         if (verbose > 0)
 436                 rprintf(FINFO, "created directory %s\n", safe_fname(name));
 437
 438         if (dry_run) {
 439                 dry_run++;
 440                 return NULL;
 441         }
 442
 443         if (!push_dir(name)) {
 444                 rsyserr(FERROR, errno, "push_dir#2 %s failed",
 445                         full_fname(name));
 446                 exit_cleanup(RERR_FILESELECT);
 447         }
 448
 449         return NULL;
 450 }
 451
 452
 453 /* This is only called by the sender. */
 454 static void read_final_goodbye(int f_in, int f_out)
 455 {
 456         int i;
 457
 458         if (protocol_version < 29)
 459                 i = read_int(f_in);
 460         else {
 461                 while ((i = read_int(f_in)) == the_file_list->count
 462                     && read_shortint(f_in) == ITEM_IS_NEW) {
 463                         /* Forward the keep-alive (no-op) to the receiver. */
 464                         write_int(f_out, the_file_list->count);
 465                         write_shortint(f_out, ITEM_IS_NEW);
 466                 }
 467         }
 468
 469         if (i != -1) {
 470                 rprintf(FERROR, "Invalid packet at end of run (%d) [%s]\n",
 471                         i, who_am_i());
 472                 exit_cleanup(RERR_PROTOCOL);
 473         }
 474 }
 475
 476
 477 static void do_server_sender(int f_in, int f_out, int argc,char *argv[])
 478 {
 479         struct file_list *flist;
 480         char *dir = argv[0];
 481
 482         if (verbose > 2) {
 483                 rprintf(FINFO, "server_sender starting pid=%ld\n",
 484                         (long)getpid());
 485         }
 486
 487         if (am_daemon && lp_write_only(module_id)) {
 488                 rprintf(FERROR, "ERROR: module is write only\n");
 489                 exit_cleanup(RERR_SYNTAX);
 490                 return;
 491         }
 492         if (am_daemon && lp_read_only(module_id) && remove_sent_files) {
 493                 rprintf(FERROR,
 494                     "ERROR: --remove-sent-files cannot be used with a read-only module\n");
 495                 exit_cleanup(RERR_SYNTAX);
 496                 return;
 497         }
 498
 499         if (!relative_paths && !push_dir(dir)) {
 500                 rsyserr(FERROR, errno, "push_dir#3 %s failed",
 501                         full_fname(dir));
 502                 exit_cleanup(RERR_FILESELECT);
 503         }
 504         argc--;
 505         argv++;
 506
 507         if (argc == 0 && (recurse || list_only)) {
 508                 argc = 1;
 509                 argv--;
 510                 argv[0] = ".";
 511         }
 512
 513         flist = send_file_list(f_out,argc,argv);
 514         if (!flist || flist->count == 0) {
 515                 exit_cleanup(0);
 516         }
 517         the_file_list = flist;
 518
 519         io_start_buffering_in();
 520         io_start_buffering_out();
 521
 522         send_files(flist,f_out,f_in);
 523         io_flush(FULL_FLUSH);
 524         handle_stats(f_out);
 525         if (protocol_version >= 24)
 526                 read_final_goodbye(f_in, f_out);
 527         io_flush(FULL_FLUSH);
 528         exit_cleanup(0);
 529 }
 530
 531
 532 static int do_recv(int f_in,int f_out,struct file_list *flist,char *local_name)
 533 {
 534         int pid;
 535         int status = 0;
 536         int error_pipe[2];
 537
 538         /* The receiving side mustn't obey this, or an existing symlink that
 539          * points to an identical file won't be replaced by the referent. */
 540         copy_links = 0;
 541
 542         if (preserve_hard_links)
 543                 init_hard_links();
 544
 545         if (fd_pair(error_pipe) < 0) {
 546                 rsyserr(FERROR, errno, "pipe failed in do_recv");
 547                 exit_cleanup(RERR_IPC);
 548         }
 549
 550         io_flush(NORMAL_FLUSH);
 551
 552         if ((pid = do_fork()) == -1) {
 553                 rsyserr(FERROR, errno, "fork failed in do_recv");
 554                 exit_cleanup(RERR_IPC);
 555         }
 556
 557         if (pid == 0) {
 558                 close(error_pipe[0]);
 559                 if (f_in != f_out)
 560                         close(f_out);
 561
 562                 /* we can't let two processes write to the socket at one time */
 563                 close_multiplexing_out();
 564
 565                 /* set place to send errors */
 566                 set_msg_fd_out(error_pipe[1]);
 567
 568                 recv_files(f_in, flist, local_name);
 569                 io_flush(FULL_FLUSH);
 570                 handle_stats(f_in);
 571
 572                 send_msg(MSG_DONE, "", 0);
 573                 io_flush(FULL_FLUSH);
 574
 575                 /* Handle any keep-alive packets from the post-processing work
 576                  * that the generator does. */
 577                 if (protocol_version >= 29) {
 578                         kluge_around_eof = -1;
 579
 580                         /* This should only get stopped via a USR2 signal. */
 581                         while (read_int(f_in) == flist->count
 582                             && read_shortint(f_in) == ITEM_IS_NEW) {}
 583
 584                         rprintf(FERROR, "Invalid packet at end of run [%s]\n",
 585                                 who_am_i());
 586                         exit_cleanup(RERR_PROTOCOL);
 587                 }
 588
 589                 /* Finally, we go to sleep until our parent kills us with a
 590                  * USR2 signal.  We sleep for a short time, as on some OSes
 591                  * a signal won't interrupt a sleep! */
 592                 while (1)
 593                         msleep(20);
 594         }
 595
 596         am_generator = 1;
 597         close_multiplexing_in();
 598         if (write_batch && !am_server)
 599                 stop_write_batch();
 600
 601         close(error_pipe[1]);
 602         if (f_in != f_out)
 603                 close(f_in);
 604
 605         io_start_buffering_out();
 606
 607         set_msg_fd_in(error_pipe[0]);
 608
 609         generate_files(f_out, flist, local_name);
 610
 611         handle_stats(-1);
 612         io_flush(FULL_FLUSH);
 613         if (protocol_version >= 24) {
 614                 /* send a final goodbye message */
 615                 write_int(f_out, -1);
 616         }
 617         io_flush(FULL_FLUSH);
 618
 619         set_msg_fd_in(-1);
 620         kill(pid, SIGUSR2);
 621         wait_process(pid, &status);
 622         return status;
 623 }
 624
 625
 626 static void do_server_recv(int f_in, int f_out, int argc,char *argv[])
 627 {
 628         int status;
 629         struct file_list *flist;
 630         char *local_name = NULL;
 631         char *dir = NULL;
 632         char olddir[sizeof curr_dir];
 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         strlcpy(olddir, curr_dir, sizeof olddir);
 678         if (always_checksum && argc > 0)
 679                 pre_checksum = push_dir(argv[0]);
 680
 681         flist = recv_file_list(f_in);
 682         verbose = save_verbose;
 683         if (!flist) {
 684                 rprintf(FERROR,"server_recv: recv_file_list error\n");
 685                 exit_cleanup(RERR_FILESELECT);
 686         }
 687         the_file_list = flist;
 688
 689         if (pre_checksum)
 690                 pop_dir(olddir);
 691
 692         if (argc > 0)
 693                 local_name = get_local_name(flist,argv[0]);
 694
 695         status = do_recv(f_in,f_out,flist,local_name);
 696         exit_cleanup(status);
 697 }
 698
 699
 700 int child_main(int argc, char *argv[])
 701 {
 702         start_server(STDIN_FILENO, STDOUT_FILENO, argc, argv);
 703         return 0;
 704 }
 705
 706
 707 void start_server(int f_in, int f_out, int argc, char *argv[])
 708 {
 709         set_nonblocking(f_in);
 710         set_nonblocking(f_out);
 711
 712         io_set_sock_fds(f_in, f_out);
 713         setup_protocol(f_out, f_in);
 714
 715         if (protocol_version >= 23)
 716                 io_start_multiplex_out();
 717
 718         if (am_sender) {
 719                 keep_dirlinks = 0; /* Must be disabled on the sender. */
 720                 if (need_messages_from_generator)
 721                         io_start_multiplex_in();
 722
 723                 recv_filter_list(f_in);
 724                 do_server_sender(f_in, f_out, argc, argv);
 725         } else {
 726                 do_server_recv(f_in, f_out, argc, argv);
 727         }
 728         exit_cleanup(0);
 729 }
 730
 731
 732 /*
 733  * This is called once the connection has been negotiated.  It is used
 734  * for rsyncd, remote-shell, and local connections.
 735  */
 736 int client_run(int f_in, int f_out, pid_t pid, int argc, char *argv[])
 737 {
 738         struct file_list *flist = NULL;
 739         int status = 0, status2 = 0;
 740         char olddir[sizeof curr_dir];
 741         char *local_name = NULL;
 742
 743         cleanup_child_pid = pid;
 744         if (!read_batch) {
 745                 set_nonblocking(f_in);
 746                 set_nonblocking(f_out);
 747         }
 748
 749         io_set_sock_fds(f_in, f_out);
 750         setup_protocol(f_out,f_in);
 751
 752         if (protocol_version >= 23 && !read_batch)
 753                 io_start_multiplex_in();
 754
 755         /* We set our stderr file handle to blocking because ssh might have
 756          * set it to non-blocking.  This can be particularly troublesome if
 757          * stderr is a clone of stdout, because ssh would have set our stdout
 758          * to non-blocking at the same time (which can easily cause us to lose
 759          * output from our print statements).  This kluge shouldn't cause ssh
 760          * any problems for how we use it.  Note also that we delayed setting
 761          * this until after the above protocol setup so that we know for sure
 762          * that ssh is done twiddling its file descriptors.  */
 763         set_blocking(STDERR_FILENO);
 764
 765         if (am_sender) {
 766                 keep_dirlinks = 0; /* Must be disabled on the sender. */
 767                 io_start_buffering_out();
 768                 if (!filesfrom_host)
 769                         set_msg_fd_in(f_in);
 770                 send_filter_list(f_out);
 771                 if (filesfrom_host)
 772                         filesfrom_fd = f_in;
 773
 774                 if (write_batch && !am_server)
 775                         start_write_batch(f_out);
 776                 flist = send_file_list(f_out, argc, argv);
 777                 set_msg_fd_in(-1);
 778                 if (verbose > 3)
 779                         rprintf(FINFO,"file list sent\n");
 780                 the_file_list = flist;
 781
 782                 io_flush(NORMAL_FLUSH);
 783                 send_files(flist,f_out,f_in);
 784                 io_flush(FULL_FLUSH);
 785                 handle_stats(-1);
 786                 if (protocol_version >= 24)
 787                         read_final_goodbye(f_in, f_out);
 788                 if (pid != -1) {
 789                         if (verbose > 3)
 790                                 rprintf(FINFO,"client_run waiting on %d\n", (int) pid);
 791                         io_flush(FULL_FLUSH);
 792                         wait_process(pid, &status);
 793                 }
 794                 output_summary();
 795                 io_flush(FULL_FLUSH);
 796                 exit_cleanup(status);
 797         }
 798
 799         if (need_messages_from_generator && !read_batch)
 800                 io_start_multiplex_out();
 801
 802         if (argc == 0)
 803                 list_only |= 1;
 804
 805         send_filter_list(read_batch ? -1 : f_out);
 806
 807         if (filesfrom_fd >= 0) {
 808                 io_set_filesfrom_fds(filesfrom_fd, f_out);
 809                 filesfrom_fd = -1;
 810         }
 811
 812         strlcpy(olddir, curr_dir, sizeof olddir);
 813         if (always_checksum)
 814                 pre_checksum = push_dir(argv[0]);
 815
 816         if (write_batch && !am_server)
 817                 start_write_batch(f_in);
 818         flist = recv_file_list(f_in);
 819         the_file_list = flist;
 820
 821         if (pre_checksum)
 822                 pop_dir(olddir);
 823
 824         if (flist && flist->count > 0) {
 825                 local_name = get_local_name(flist, argv[0]);
 826
 827                 status2 = do_recv(f_in, f_out, flist, local_name);
 828         } else {
 829                 handle_stats(-1);
 830                 output_summary();
 831         }
 832
 833         if (pid != -1) {
 834                 if (verbose > 3)
 835                         rprintf(FINFO,"client_run2 waiting on %d\n", (int) pid);
 836                 io_flush(FULL_FLUSH);
 837                 wait_process(pid, &status);
 838         }
 839
 840         return MAX(status, status2);
 841 }
 842
 843 static int copy_argv (char *argv[])
 844 {
 845         int i;
 846
 847         for (i = 0; argv[i]; i++) {
 848                 if (!(argv[i] = strdup(argv[i]))) {
 849                         rprintf (FERROR, "out of memory at %s(%d)\n",
 850                                  __FILE__, __LINE__);
 851                         return RERR_MALLOC;
 852                 }
 853         }
 854
 855         return 0;
 856 }
 857
 858
 859 /**
 860  * Start a client for either type of remote connection.  Work out
 861  * whether the arguments request a remote shell or rsyncd connection,
 862  * and call the appropriate connection function, then run_client.
 863  *
 864  * Calls either start_socket_client (for sockets) or do_cmd and
 865  * client_run (for ssh).
 866  **/
 867 static int start_client(int argc, char *argv[])
 868 {
 869         char *p;
 870         char *shell_machine = NULL;
 871         char *shell_path = NULL;
 872         char *shell_user = NULL;
 873         int ret;
 874         pid_t pid;
 875         int f_in,f_out;
 876         int rc;
 877
 878         /* Don't clobber argv[] so that ps(1) can still show the right
 879          * command line. */
 880         if ((rc = copy_argv(argv)))
 881                 return rc;
 882
 883         if (!read_batch) { /* for read_batch, NO source is specified */
 884                 argc--;
 885                 shell_path = check_for_hostspec(argv[0], &shell_machine, &rsync_port);
 886                 if (shell_path) { /* source is remote */
 887                         char *dummy1;
 888                         int dummy2;
 889                         if (argc && check_for_hostspec(argv[argc], &dummy1, &dummy2)) {
 890                                 rprintf(FERROR,
 891                                         "The source and destination cannot both be remote.\n");
 892                                 exit_cleanup(RERR_SYNTAX);
 893                         }
 894                         argv++;
 895                         if (filesfrom_host && *filesfrom_host
 896                             && strcmp(filesfrom_host, shell_machine) != 0) {
 897                                 rprintf(FERROR,
 898                                         "--files-from hostname is not the same as the transfer hostname\n");
 899                                 exit_cleanup(RERR_SYNTAX);
 900                         }
 901                         if (rsync_port) {
 902                                 if (!shell_cmd) {
 903                                         return start_socket_client(shell_machine,
 904                                                                    shell_path,
 905                                                                    argc, argv);
 906                                 }
 907                                 daemon_over_rsh = 1;
 908                         }
 909
 910                         am_sender = 0;
 911                 } else { /* source is local, check dest arg */
 912                         am_sender = 1;
 913
 914                         if (argc < 1) { /* destination required */
 915                                 usage(FERROR);
 916                                 exit_cleanup(RERR_SYNTAX);
 917                         }
 918
 919                         shell_path = check_for_hostspec(argv[argc], &shell_machine, &rsync_port);
 920                         if (shell_path && filesfrom_host && *filesfrom_host
 921                             && strcmp(filesfrom_host, shell_machine) != 0) {
 922                                 rprintf(FERROR,
 923                                         "--files-from hostname is not the same as the transfer hostname\n");
 924                                 exit_cleanup(RERR_SYNTAX);
 925                         }
 926                         if (!shell_path) { /* no hostspec found, so src & dest are local */
 927                                 local_server = 1;
 928                                 if (filesfrom_host) {
 929                                         rprintf(FERROR,
 930                                                 "--files-from cannot be remote when the transfer is local\n");
 931                                         exit_cleanup(RERR_SYNTAX);
 932                                 }
 933                                 shell_machine = NULL;
 934                                 shell_path = argv[argc];
 935                         } else if (rsync_port) {
 936                                 if (!shell_cmd) {
 937                                         return start_socket_client(shell_machine,
 938                                                                    shell_path,
 939                                                                    argc, argv);
 940                                 }
 941                                 daemon_over_rsh = 1;
 942                         }
 943                 }
 944         } else {  /* read_batch */
 945                 local_server = 1;
 946                 shell_path = argv[argc-1];
 947                 if (check_for_hostspec(shell_path, &shell_machine, &rsync_port)) {
 948                         rprintf(FERROR, "remote destination is not allowed with --read-batch\n");
 949                         exit_cleanup(RERR_SYNTAX);
 950                 }
 951         }
 952
 953         if (shell_machine) {
 954                 p = strrchr(shell_machine,'@');
 955                 if (p) {
 956                         *p = 0;
 957                         shell_user = shell_machine;
 958                         shell_machine = p+1;
 959                 }
 960         }
 961
 962         if (verbose > 3) {
 963                 rprintf(FINFO,"cmd=%s machine=%s user=%s path=%s\n",
 964                         shell_cmd ? safe_fname(shell_cmd) : "",
 965                         shell_machine ? safe_fname(shell_machine) : "",
 966                         shell_user ? safe_fname(shell_user) : "",
 967                         shell_path ? safe_fname(shell_path) : "");
 968         }
 969
 970         /* for remote source, only single dest arg can remain ... */
 971         if (!am_sender && argc > 1) {
 972                 usage(FERROR);
 973                 exit_cleanup(RERR_SYNTAX);
 974         }
 975
 976         /* ... or no dest at all */
 977         if (!am_sender && argc == 0)
 978                 list_only |= 1;
 979
 980         pid = do_cmd(shell_cmd,shell_machine,shell_user,shell_path,
 981                      &f_in,&f_out);
 982
 983         /* if we're running an rsync server on the remote host over a
 984          * remote shell command, we need to do the RSYNCD protocol first */
 985         if (daemon_over_rsh) {
 986                 int tmpret;
 987                 tmpret = start_inband_exchange(shell_user, shell_path,
 988                                                f_in, f_out, argc);
 989                 if (tmpret < 0)
 990                         return tmpret;
 991         }
 992
 993         ret = client_run(f_in, f_out, pid, argc, argv);
 994
 995         fflush(stdout);
 996         fflush(stderr);
 997
 998         return ret;
 999 }
1000
1001
1002 static RETSIGTYPE sigusr1_handler(UNUSED(int val))
1003 {
1004         exit_cleanup(RERR_SIGNAL);
1005 }
1006
1007 static RETSIGTYPE sigusr2_handler(UNUSED(int val))
1008 {
1009         if (!am_server)
1010                 output_summary();
1011         close_all();
1012         if (log_got_error)
1013                 _exit(RERR_PARTIAL);
1014         _exit(0);
1015 }
1016
1017 static RETSIGTYPE sigchld_handler(UNUSED(int val))
1018 {
1019 #ifdef WNOHANG
1020         int cnt, status;
1021         pid_t pid;
1022         /* An empty waitpid() loop was put here by Tridge and we could never
1023          * get him to explain why he put it in, so rather than taking it
1024          * out we're instead saving the child exit statuses for later use.
1025          * The waitpid() loop presumably eliminates all possibility of leaving
1026          * zombie children, maybe that's why he did it.
1027          */
1028         while ((pid = waitpid(-1, &status, WNOHANG)) > 0) {
1029                 /* save the child's exit status */
1030                 for (cnt = 0; cnt < MAXCHILDPROCS; cnt++) {
1031                         if (pid_stat_table[cnt].pid == 0) {
1032                                 pid_stat_table[cnt].pid = pid;
1033                                 pid_stat_table[cnt].status = status;
1034                                 break;
1035                         }
1036                 }
1037         }
1038 #endif
1039 }
1040
1041
1042 /**
1043  * This routine catches signals and tries to send them to gdb.
1044  *
1045  * Because it's called from inside a signal handler it ought not to
1046  * use too many library routines.
1047  *
1048  * @todo Perhaps use "screen -X" instead/as well, to help people
1049  * debugging without easy access to X.  Perhaps use an environment
1050  * variable, or just call a script?
1051  *
1052  * @todo The /proc/ magic probably only works on Linux (and
1053  * Solaris?)  Can we be more portable?
1054  **/
1055 #ifdef MAINTAINER_MODE
1056 const char *get_panic_action(void)
1057 {
1058         const char *cmd_fmt = getenv("RSYNC_PANIC_ACTION");
1059
1060         if (cmd_fmt)
1061                 return cmd_fmt;
1062         else
1063                 return "xterm -display :0 -T Panic -n Panic "
1064                         "-e gdb /proc/%d/exe %d";
1065 }
1066
1067
1068 /**
1069  * Handle a fatal signal by launching a debugger, controlled by $RSYNC_PANIC_ACTION.
1070  *
1071  * This signal handler is only installed if we were configured with
1072  * --enable-maintainer-mode.  Perhaps it should always be on and we
1073  * should just look at the environment variable, but I'm a bit leery
1074  * of a signal sending us into a busy loop.
1075  **/
1076 static RETSIGTYPE rsync_panic_handler(UNUSED(int whatsig))
1077 {
1078         char cmd_buf[300];
1079         int ret;
1080
1081         sprintf(cmd_buf, get_panic_action(),
1082                 getpid(), getpid());
1083
1084         /* Unless we failed to execute gdb, we allow the process to
1085          * continue.  I'm not sure if that's right. */
1086         ret = system(cmd_buf);
1087         if (ret)
1088                 _exit(ret);
1089 }
1090 #endif
1091
1092
1093 int main(int argc,char *argv[])
1094 {
1095         int ret;
1096         int orig_argc = argc;
1097         char **orig_argv = argv;
1098
1099         signal(SIGUSR1, sigusr1_handler);
1100         signal(SIGUSR2, sigusr2_handler);
1101         signal(SIGCHLD, sigchld_handler);
1102 #ifdef MAINTAINER_MODE
1103         signal(SIGSEGV, rsync_panic_handler);
1104         signal(SIGFPE, rsync_panic_handler);
1105         signal(SIGABRT, rsync_panic_handler);
1106         signal(SIGBUS, rsync_panic_handler);
1107 #endif /* def MAINTAINER_MODE */
1108
1109         starttime = time(NULL);
1110         am_root = (MY_UID() == 0);
1111
1112         memset(&stats, 0, sizeof(stats));
1113
1114         if (argc < 2) {
1115                 usage(FERROR);
1116                 exit_cleanup(RERR_SYNTAX);
1117         }
1118
1119         /* we set a 0 umask so that correct file permissions can be
1120          * carried across */
1121         orig_umask = (int)umask(0);
1122
1123         if (!parse_arguments(&argc, (const char ***) &argv, 1)) {
1124                 /* FIXME: We ought to call the same error-handling
1125                  * code here, rather than relying on getopt. */
1126                 option_error();
1127                 exit_cleanup(RERR_SYNTAX);
1128         }
1129
1130         signal(SIGINT,SIGNAL_CAST sig_int);
1131         signal(SIGHUP,SIGNAL_CAST sig_int);
1132         signal(SIGTERM,SIGNAL_CAST sig_int);
1133
1134         /* Ignore SIGPIPE; we consistently check error codes and will
1135          * see the EPIPE. */
1136         signal(SIGPIPE, SIG_IGN);
1137
1138 #if defined CONFIG_LOCALE && defined HAVE_SETLOCALE
1139         setlocale(LC_CTYPE, "");
1140 #endif
1141
1142         /* Initialize push_dir here because on some old systems getcwd
1143          * (implemented by forking "pwd" and reading its output) doesn't
1144          * work when there are other child processes.  Also, on all systems
1145          * that implement getcwd that way "pwd" can't be found after chroot. */
1146         push_dir(NULL);
1147
1148         init_flist();
1149
1150         if ((write_batch || read_batch) && !am_server) {
1151                 if (write_batch)
1152                         write_batch_shell_file(orig_argc, orig_argv, argc);
1153
1154                 if (read_batch && strcmp(batch_name, "-") == 0)
1155                         batch_fd = STDIN_FILENO;
1156                 else {
1157                         batch_fd = do_open(batch_name,
1158                                    write_batch ? O_WRONLY | O_CREAT | O_TRUNC
1159                                    : O_RDONLY, S_IRUSR | S_IWUSR);
1160                 }
1161                 if (batch_fd < 0) {
1162                         rsyserr(FERROR, errno, "Batch file %s open error",
1163                                 full_fname(batch_name));
1164                         exit_cleanup(RERR_FILEIO);
1165                 }
1166                 if (read_batch)
1167                         read_stream_flags(batch_fd);
1168         }
1169         if (write_batch < 0)
1170                 dry_run = 1;
1171
1172         if (am_daemon && !am_server)
1173                 return daemon_main();
1174
1175         if (argc < 1) {
1176                 usage(FERROR);
1177                 exit_cleanup(RERR_SYNTAX);
1178         }
1179
1180         if (am_server) {
1181                 set_nonblocking(STDIN_FILENO);
1182                 set_nonblocking(STDOUT_FILENO);
1183                 if (am_daemon)
1184                         return start_daemon(STDIN_FILENO, STDOUT_FILENO);
1185                 start_server(STDIN_FILENO, STDOUT_FILENO, argc, argv);
1186         }
1187
1188         ret = start_client(argc, argv);
1189         if (ret == -1)
1190                 exit_cleanup(RERR_STARTCLIENT);
1191         else
1192                 exit_cleanup(ret);
1193
1194         return ret;
1195 }