main.c

   1 /* -*- c-file-style: "linux" -*-
   2
   3    Copyright (C) 1996-2001 by Andrew Tridgell <tridge@samba.org>
   4    Copyright (C) Paul Mackerras 1996
   5    Copyright (C) 2001, 2002 by Martin Pool <mbp@samba.org>
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20 */
  21
  22 #include "rsync.h"
  23
  24 time_t starttime = 0;
  25
  26 extern struct stats stats;
  27 extern int am_root;
  28 extern int am_server;
  29 extern int am_sender;
  30 extern int am_generator;
  31 extern int am_daemon;
  32 extern int verbose;
  33 extern int blocking_io;
  34 extern int cvs_exclude;
  35 extern int delete_mode;
  36 extern int delete_excluded;
  37 extern int delete_after;
  38 extern int daemon_over_rsh;
  39 extern int do_stats;
  40 extern int dry_run;
  41 extern int list_only;
  42 extern int local_server;
  43 extern int log_got_error;
  44 extern int module_id;
  45 extern int orig_umask;
  46 extern int keep_dirlinks;
  47 extern int preserve_hard_links;
  48 extern int protocol_version;
  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 char *files_from;
  60 extern char *remote_filesfrom_file;
  61 extern char *rsync_path;
  62 extern char *shell_cmd;
  63 extern char *batch_name;
  64
  65
  66 /* there's probably never more than at most 2 outstanding child processes,
  67  * but set it higher just in case.
  68  */
  69 #define MAXCHILDPROCS 5
  70
  71 struct pid_status {
  72         pid_t pid;
  73         int   status;
  74 } pid_stat_table[MAXCHILDPROCS];
  75
  76 static void show_malloc_stats(void);
  77
  78 /****************************************************************************
  79 wait for a process to exit, calling io_flush while waiting
  80 ****************************************************************************/
  81 void wait_process(pid_t pid, int *status)
  82 {
  83         pid_t waited_pid;
  84         int cnt;
  85
  86         while ((waited_pid = waitpid(pid, status, WNOHANG)) == 0) {
  87                 msleep(20);
  88                 io_flush(FULL_FLUSH);
  89         }
  90
  91         if (waited_pid == -1 && errno == ECHILD) {
  92                 /* status of requested child no longer available.
  93                  * check to see if it was processed by the sigchld_handler.
  94                  */
  95                 for (cnt = 0;  cnt < MAXCHILDPROCS; cnt++) {
  96                         if (pid == pid_stat_table[cnt].pid) {
  97                                 *status = pid_stat_table[cnt].status;
  98                                 pid_stat_table[cnt].pid = 0;
  99                                 break;
 100                         }
 101                 }
 102         }
 103
 104         /* TODO: If the child exited on a signal, then log an
 105          * appropriate error message.  Perhaps we should also accept a
 106          * message describing the purpose of the child.  Also indicate
 107          * this to the caller so that thhey know something went
 108          * wrong.  */
 109         *status = WEXITSTATUS(*status);
 110 }
 111
 112 /* This function gets called from all 3 processes.  We want the client side
 113  * to actually output the text, but the sender is the only process that has
 114  * all the stats we need.  So, if we're a client sender, we do the report.
 115  * If we're a server sender, we write the stats on the supplied fd.  If
 116  * we're the client receiver we read the stats from the supplied fd and do
 117  * the report.  All processes might also generate a set of debug stats, if
 118  * the verbose level is high enough (this is the only thing that the
 119  * generator process and the server receiver ever do here). */
 120 static void report(int f)
 121 {
 122         /* Cache two stats because the read/write code can change it. */
 123         int64 total_read = stats.total_read;
 124         int64 total_written = stats.total_written;
 125         time_t t = time(NULL);
 126
 127         if (do_stats && verbose > 1) {
 128                 /* These come out from every process */
 129                 show_malloc_stats();
 130                 show_flist_stats();
 131         }
 132
 133         if (am_generator)
 134                 return;
 135
 136         if (am_daemon) {
 137                 log_exit(0, __FILE__, __LINE__);
 138                 if (f == -1 || !am_sender)
 139                         return;
 140         }
 141
 142         if (am_server) {
 143                 if (am_sender) {
 144                         write_longint(f, total_read);
 145                         write_longint(f, total_written);
 146                         write_longint(f, stats.total_size);
 147                 }
 148                 return;
 149         }
 150
 151         /* this is the client */
 152
 153         if (!am_sender) {
 154                 /* Read the first two in opposite order because the meaning of
 155                  * read/write swaps when switching from sender to receiver. */
 156                 total_written = read_longint(f);
 157                 total_read = read_longint(f);
 158                 stats.total_size = read_longint(f);
 159         } else if (write_batch) {
 160                 /* The --read-batch process is going to be a client
 161                  * receiver, so we need to give it the stats. */
 162                 write_longint(batch_fd, total_read);
 163                 write_longint(batch_fd, total_written);
 164                 write_longint(batch_fd, stats.total_size);
 165         }
 166
 167         if (do_stats) {
 168                 rprintf(FINFO,"\nNumber of files: %d\n", stats.num_files);
 169                 rprintf(FINFO,"Number of files transferred: %d\n",
 170                         stats.num_transferred_files);
 171                 rprintf(FINFO,"Total file size: %.0f bytes\n",
 172                         (double)stats.total_size);
 173                 rprintf(FINFO,"Total transferred file size: %.0f bytes\n",
 174                         (double)stats.total_transferred_size);
 175                 rprintf(FINFO,"Literal data: %.0f bytes\n",
 176                         (double)stats.literal_data);
 177                 rprintf(FINFO,"Matched data: %.0f bytes\n",
 178                         (double)stats.matched_data);
 179                 rprintf(FINFO,"File list size: %d\n", stats.flist_size);
 180                 rprintf(FINFO,"Total bytes sent: %.0f\n",
 181                         (double)total_written);
 182                 rprintf(FINFO,"Total bytes received: %.0f\n",
 183                         (double)total_read);
 184         }
 185
 186         if (verbose || do_stats) {
 187                 rprintf(FINFO,
 188                         "\nsent %.0f bytes  received %.0f bytes  %.2f bytes/sec\n",
 189                         (double)total_written, (double)total_read,
 190                         (total_written + total_read)/(0.5 + (t - starttime)));
 191                 rprintf(FINFO, "total size is %.0f  speedup is %.2f\n",
 192                         (double)stats.total_size,
 193                         (double)stats.total_size / (total_written+total_read));
 194         }
 195
 196         fflush(stdout);
 197         fflush(stderr);
 198 }
 199
 200
 201 /**
 202  * If our C library can get malloc statistics, then show them to FINFO
 203  **/
 204 static void show_malloc_stats(void)
 205 {
 206 #ifdef HAVE_MALLINFO
 207         struct mallinfo mi;
 208
 209         mi = mallinfo();
 210
 211         rprintf(FINFO, "\n" RSYNC_NAME "[%d] (%s%s%s) heap statistics:\n",
 212                 getpid(),
 213                 am_server ? "server " : "",
 214                 am_daemon ? "daemon " : "",
 215                 who_am_i());
 216         rprintf(FINFO, "  arena:     %10d   (bytes from sbrk)\n", mi.arena);
 217         rprintf(FINFO, "  ordblks:   %10d   (chunks not in use)\n", mi.ordblks);
 218         rprintf(FINFO, "  smblks:    %10d\n", mi.smblks);
 219         rprintf(FINFO, "  hblks:     %10d   (chunks from mmap)\n", mi.hblks);
 220         rprintf(FINFO, "  hblkhd:    %10d   (bytes from mmap)\n", mi.hblkhd);
 221         rprintf(FINFO, "  allmem:    %10d   (bytes from sbrk + mmap)\n",
 222             mi.arena + mi.hblkhd);
 223         rprintf(FINFO, "  usmblks:   %10d\n", mi.usmblks);
 224         rprintf(FINFO, "  fsmblks:   %10d\n", mi.fsmblks);
 225         rprintf(FINFO, "  uordblks:  %10d   (bytes used)\n", mi.uordblks);
 226         rprintf(FINFO, "  fordblks:  %10d   (bytes free)\n", mi.fordblks);
 227         rprintf(FINFO, "  keepcost:  %10d   (bytes in releasable chunk)\n", mi.keepcost);
 228 #endif /* HAVE_MALLINFO */
 229 }
 230
 231
 232 /* Start the remote shell.   cmd may be NULL to use the default. */
 233 static pid_t do_cmd(char *cmd, char *machine, char *user, char *path,
 234                     int *f_in, int *f_out)
 235 {
 236         int i, argc = 0;
 237         char *args[MAX_ARGS];
 238         pid_t ret;
 239         char *tok, *dir = NULL;
 240         int dash_l_set = 0;
 241
 242         if (!read_batch && !local_server) {
 243                 char *rsh_env = getenv(RSYNC_RSH_ENV);
 244                 if (!cmd)
 245                         cmd = rsh_env;
 246                 if (!cmd)
 247                         cmd = RSYNC_RSH;
 248                 cmd = strdup(cmd);
 249                 if (!cmd)
 250                         goto oom;
 251
 252                 for (tok = strtok(cmd, " "); tok; tok = strtok(NULL, " ")) {
 253                         /* Comparison leaves rooms for server_options(). */
 254                         if (argc >= MAX_ARGS - 100) {
 255                                 rprintf(FERROR, "internal: args[] overflowed in do_cmd()\n");
 256                                 exit_cleanup(RERR_SYNTAX);
 257                         }
 258                         args[argc++] = tok;
 259                 }
 260
 261                 /* check to see if we've already been given '-l user' in
 262                  * the remote-shell command */
 263                 for (i = 0; i < argc-1; i++) {
 264                         if (!strcmp(args[i], "-l") && args[i+1][0] != '-')
 265                                 dash_l_set = 1;
 266                 }
 267
 268 #if HAVE_REMSH
 269                 /* remsh (on HPUX) takes the arguments the other way around */
 270                 args[argc++] = machine;
 271                 if (user && !(daemon_over_rsh && dash_l_set)) {
 272                         args[argc++] = "-l";
 273                         args[argc++] = user;
 274                 }
 275 #else
 276                 if (user && !(daemon_over_rsh && dash_l_set)) {
 277                         args[argc++] = "-l";
 278                         args[argc++] = user;
 279                 }
 280                 args[argc++] = machine;
 281 #endif
 282
 283                 args[argc++] = rsync_path;
 284
 285                 if (blocking_io < 0) {
 286                         char *cp;
 287                         if ((cp = strrchr(cmd, '/')) != NULL)
 288                                 cp++;
 289                         else
 290                                 cp = cmd;
 291                         if (strcmp(cp, "rsh") == 0 || strcmp(cp, "remsh") == 0)
 292                                 blocking_io = 1;
 293                 }
 294
 295                 server_options(args,&argc);
 296
 297                 if (argc >= MAX_ARGS - 2) {
 298                         rprintf(FERROR, "internal: args[] overflowed in do_cmd()\n");
 299                         exit_cleanup(RERR_SYNTAX);
 300                 }
 301         }
 302
 303         args[argc++] = ".";
 304
 305         if (!daemon_over_rsh && path && *path)
 306                 args[argc++] = path;
 307
 308         args[argc] = NULL;
 309
 310         if (verbose > 3) {
 311                 rprintf(FINFO,"cmd=");
 312                 for (i = 0; i < argc; i++)
 313                         rprintf(FINFO,"%s ",args[i]);
 314                 rprintf(FINFO,"\n");
 315         }
 316
 317         if (read_batch) {
 318                 int from_gen_pipe[2];
 319                 if (fd_pair(from_gen_pipe) < 0) {
 320                         rsyserr(FERROR, errno, "pipe");
 321                         exit_cleanup(RERR_IPC);
 322                 }
 323                 batch_gen_fd = from_gen_pipe[0];
 324                 *f_out = from_gen_pipe[1];
 325                 *f_in = batch_fd;
 326                 ret = -1; /* no child pid */
 327         } else if (local_server) {
 328                 /* If the user didn't request --[no-]whole-file, force
 329                  * it on, but only if we're not batch processing. */
 330                 if (whole_file < 0 && !write_batch)
 331                         whole_file = 1;
 332                 ret = local_child(argc, args, f_in, f_out, child_main);
 333         } else
 334                 ret = piped_child(args,f_in,f_out);
 335
 336         if (dir)
 337                 free(dir);
 338
 339         return ret;
 340
 341 oom:
 342         out_of_memory("do_cmd");
 343         return 0; /* not reached */
 344 }
 345
 346
 347 static char *get_local_name(struct file_list *flist,char *name)
 348 {
 349         STRUCT_STAT st;
 350         int e;
 351
 352         if (verbose > 2)
 353                 rprintf(FINFO,"get_local_name count=%d %s\n",
 354                         flist->count, NS(name));
 355
 356         if (!name)
 357                 return NULL;
 358
 359         if (do_stat(name,&st) == 0) {
 360                 if (S_ISDIR(st.st_mode)) {
 361                         if (!push_dir(name)) {
 362                                 rsyserr(FERROR, errno, "push_dir#1 %s failed",
 363                                         full_fname(name));
 364                                 exit_cleanup(RERR_FILESELECT);
 365                         }
 366                         return NULL;
 367                 }
 368                 if (flist->count > 1) {
 369                         rprintf(FERROR,"ERROR: destination must be a directory when copying more than 1 file\n");
 370                         exit_cleanup(RERR_FILESELECT);
 371                 }
 372                 return name;
 373         }
 374
 375         if (flist->count <= 1 && ((e = strlen(name)) <= 1 || name[e-1] != '/'))
 376                 return name;
 377
 378         if (do_mkdir(name,0777 & ~orig_umask) != 0) {
 379                 rsyserr(FERROR, errno, "mkdir %s failed", full_fname(name));
 380                 exit_cleanup(RERR_FILEIO);
 381         } else {
 382                 if (verbose > 0)
 383                         rprintf(FINFO,"created directory %s\n",name);
 384         }
 385
 386         if (!push_dir(name)) {
 387                 rsyserr(FERROR, errno, "push_dir#2 %s failed",
 388                         full_fname(name));
 389                 exit_cleanup(RERR_FILESELECT);
 390         }
 391
 392         return NULL;
 393 }
 394
 395
 396 static void do_server_sender(int f_in, int f_out, int argc,char *argv[])
 397 {
 398         int i;
 399         struct file_list *flist;
 400         char *dir = argv[0];
 401
 402         if (verbose > 2) {
 403                 rprintf(FINFO, "server_sender starting pid=%ld\n",
 404                         (long)getpid());
 405         }
 406
 407         if (am_daemon && lp_write_only(module_id)) {
 408                 rprintf(FERROR, "ERROR: module is write only\n");
 409                 exit_cleanup(RERR_SYNTAX);
 410                 return;
 411         }
 412
 413         if (!relative_paths && !push_dir(dir)) {
 414                 rsyserr(FERROR, errno, "push_dir#3 %s failed",
 415                         full_fname(dir));
 416                 exit_cleanup(RERR_FILESELECT);
 417         }
 418         argc--;
 419         argv++;
 420
 421         if (strcmp(dir,".")) {
 422                 int l = strlen(dir);
 423                 if (strcmp(dir,"/") == 0)
 424                         l = 0;
 425                 for (i = 0; i < argc; i++)
 426                         argv[i] += l+1;
 427         }
 428
 429         if (argc == 0 && recurse) {
 430                 argc = 1;
 431                 argv--;
 432                 argv[0] = ".";
 433         }
 434
 435         flist = send_file_list(f_out,argc,argv);
 436         if (!flist || flist->count == 0) {
 437                 exit_cleanup(0);
 438         }
 439
 440         io_start_buffering_in();
 441         io_start_buffering_out();
 442
 443         send_files(flist,f_out,f_in);
 444         io_flush(FULL_FLUSH);
 445         report(f_out);
 446         if (protocol_version >= 24) {
 447                 /* final goodbye message */
 448                 read_int(f_in);
 449         }
 450         io_flush(FULL_FLUSH);
 451         exit_cleanup(0);
 452 }
 453
 454
 455 static int do_recv(int f_in,int f_out,struct file_list *flist,char *local_name)
 456 {
 457         int pid;
 458         int status = 0;
 459         int error_pipe[2];
 460
 461         if (preserve_hard_links)
 462                 init_hard_links(flist);
 463
 464         if (!delete_after) {
 465                 /* I moved this here from recv_files() to prevent a race condition */
 466                 if (recurse && delete_mode && !local_name && flist->count > 0)
 467                         delete_files(flist);
 468         }
 469
 470         if (fd_pair(error_pipe) < 0) {
 471                 rprintf(FERROR,"error pipe failed in do_recv\n");
 472                 exit_cleanup(RERR_SOCKETIO);
 473         }
 474
 475         io_flush(NORMAL_FLUSH);
 476
 477         if ((pid = do_fork()) == 0) {
 478                 close(error_pipe[0]);
 479                 if (f_in != f_out)
 480                         close(f_out);
 481
 482                 /* we can't let two processes write to the socket at one time */
 483                 close_multiplexing_out();
 484
 485                 /* set place to send errors */
 486                 set_msg_fd_out(error_pipe[1]);
 487
 488                 recv_files(f_in,flist,local_name);
 489                 io_flush(FULL_FLUSH);
 490                 report(f_in);
 491
 492                 send_msg(MSG_DONE, "", 0);
 493                 io_flush(FULL_FLUSH);
 494                 /* finally we go to sleep until our parent kills us
 495                  * with a USR2 signal. We sleep for a short time as on
 496                  * some OSes a signal won't interrupt a sleep! */
 497                 while (1)
 498                         msleep(20);
 499         }
 500
 501         am_generator = 1;
 502         close_multiplexing_in();
 503         if (write_batch)
 504                 stop_write_batch();
 505
 506         close(error_pipe[1]);
 507         if (f_in != f_out)
 508                 close(f_in);
 509
 510         io_start_buffering_out();
 511
 512         set_msg_fd_in(error_pipe[0]);
 513
 514         generate_files(f_out, flist, local_name);
 515
 516         get_redo_num(); /* Read final MSG_DONE and any prior messages. */
 517         report(-1);
 518         io_flush(FULL_FLUSH);
 519         if (protocol_version >= 24) {
 520                 /* send a final goodbye message */
 521                 write_int(f_out, -1);
 522         }
 523         io_flush(FULL_FLUSH);
 524
 525         set_msg_fd_in(-1);
 526         kill(pid, SIGUSR2);
 527         wait_process(pid, &status);
 528         return status;
 529 }
 530
 531
 532 static void do_server_recv(int f_in, int f_out, int argc,char *argv[])
 533 {
 534         int status;
 535         struct file_list *flist;
 536         char *local_name = NULL;
 537         char *dir = NULL;
 538
 539         if (verbose > 2) {
 540                 rprintf(FINFO, "server_recv(%d) starting pid=%ld\n",
 541                         argc, (long)getpid());
 542         }
 543
 544         if (am_daemon && lp_read_only(module_id)) {
 545                 rprintf(FERROR,"ERROR: module is read only\n");
 546                 exit_cleanup(RERR_SYNTAX);
 547                 return;
 548         }
 549
 550
 551         if (argc > 0) {
 552                 dir = argv[0];
 553                 argc--;
 554                 argv++;
 555                 if (!am_daemon && !push_dir(dir)) {
 556                         rsyserr(FERROR, errno, "push_dir#4 %s failed",
 557                                 full_fname(dir));
 558                         exit_cleanup(RERR_FILESELECT);
 559                 }
 560         }
 561
 562         io_start_buffering_in();
 563         if (delete_mode && !delete_excluded)
 564                 recv_exclude_list(f_in);
 565
 566         if (filesfrom_fd >= 0) {
 567                 /* We're receiving the file info from the sender, so we need
 568                  * the IO routines to automatically write out the names onto
 569                  * our f_out socket as we read the list info from the sender.
 570                  * This avoids both deadlock and extra delays/buffers. */
 571                 io_set_filesfrom_fds(filesfrom_fd, f_out);
 572                 filesfrom_fd = -1;
 573         }
 574
 575         flist = recv_file_list(f_in);
 576         if (!flist) {
 577                 rprintf(FERROR,"server_recv: recv_file_list error\n");
 578                 exit_cleanup(RERR_FILESELECT);
 579         }
 580
 581         if (argc > 0) {
 582                 if (strcmp(dir,".")) {
 583                         argv[0] += strlen(dir);
 584                         if (argv[0][0] == '/')
 585                                 argv[0]++;
 586                 }
 587                 local_name = get_local_name(flist,argv[0]);
 588         }
 589
 590         status = do_recv(f_in,f_out,flist,local_name);
 591         exit_cleanup(status);
 592 }
 593
 594
 595 int child_main(int argc, char *argv[])
 596 {
 597         start_server(STDIN_FILENO, STDOUT_FILENO, argc, argv);
 598         return 0;
 599 }
 600
 601
 602 void start_server(int f_in, int f_out, int argc, char *argv[])
 603 {
 604         set_nonblocking(f_in);
 605         set_nonblocking(f_out);
 606
 607         io_set_sock_fds(f_in, f_out);
 608         setup_protocol(f_out, f_in);
 609
 610         if (protocol_version >= 23)
 611                 io_start_multiplex_out();
 612
 613         if (am_sender) {
 614                 keep_dirlinks = 0; /* Must be disabled on the sender. */
 615
 616                 recv_exclude_list(f_in);
 617                 if (cvs_exclude)
 618                         add_cvs_excludes();
 619                 do_server_sender(f_in, f_out, argc, argv);
 620         } else {
 621                 do_server_recv(f_in, f_out, argc, argv);
 622         }
 623         exit_cleanup(0);
 624 }
 625
 626
 627 /*
 628  * This is called once the connection has been negotiated.  It is used
 629  * for rsyncd, remote-shell, and local connections.
 630  */
 631 int client_run(int f_in, int f_out, pid_t pid, int argc, char *argv[])
 632 {
 633         struct file_list *flist = NULL;
 634         int status = 0, status2 = 0;
 635         char *local_name = NULL;
 636
 637         cleanup_child_pid = pid;
 638         if (read_batch) {
 639                 assert(am_sender == 0);
 640         } else {
 641                 set_nonblocking(f_in);
 642                 set_nonblocking(f_out);
 643         }
 644
 645         io_set_sock_fds(f_in, f_out);
 646         setup_protocol(f_out,f_in);
 647
 648         if (protocol_version >= 23 && !read_batch)
 649                 io_start_multiplex_in();
 650
 651         if (am_sender) {
 652                 keep_dirlinks = 0; /* Must be disabled on the sender. */
 653                 io_start_buffering_out();
 654                 if (cvs_exclude)
 655                         add_cvs_excludes();
 656                 if (delete_mode && !delete_excluded)
 657                         send_exclude_list(f_out);
 658                 if (remote_filesfrom_file)
 659                         filesfrom_fd = f_in;
 660
 661                 if (write_batch)
 662                         start_write_batch(f_out);
 663                 if (!read_batch) /* don't write to pipe */
 664                         flist = send_file_list(f_out,argc,argv);
 665                 if (verbose > 3)
 666                         rprintf(FINFO,"file list sent\n");
 667
 668                 io_flush(NORMAL_FLUSH);
 669                 send_files(flist,f_out,f_in);
 670                 io_flush(FULL_FLUSH);
 671                 if (protocol_version >= 24) {
 672                         /* final goodbye message */
 673                         read_int(f_in);
 674                 }
 675                 if (pid != -1) {
 676                         if (verbose > 3)
 677                                 rprintf(FINFO,"client_run waiting on %d\n", (int) pid);
 678                         io_flush(FULL_FLUSH);
 679                         wait_process(pid, &status);
 680                 }
 681                 report(-1);
 682                 io_flush(FULL_FLUSH);
 683                 exit_cleanup(status);
 684         }
 685
 686         if (argc == 0)
 687                 list_only = 1;
 688
 689         if (!read_batch)
 690                 send_exclude_list(f_out);
 691
 692         if (filesfrom_fd >= 0) {
 693                 io_set_filesfrom_fds(filesfrom_fd, f_out);
 694                 filesfrom_fd = -1;
 695         }
 696
 697         if (write_batch)
 698                 start_write_batch(f_in);
 699         flist = recv_file_list(f_in);
 700         if (!flist || flist->count == 0) {
 701                 rprintf(FINFO, "client: nothing to do: "
 702                         "perhaps you need to specify some filenames or "
 703                         "the --recursive option?\n");
 704                 exit_cleanup(0);
 705         }
 706
 707         local_name = get_local_name(flist,argv[0]);
 708
 709         status2 = do_recv(f_in,f_out,flist,local_name);
 710
 711         if (pid != -1) {
 712                 if (verbose > 3)
 713                         rprintf(FINFO,"client_run2 waiting on %d\n", (int) pid);
 714                 io_flush(FULL_FLUSH);
 715                 wait_process(pid, &status);
 716         }
 717
 718         return MAX(status, status2);
 719 }
 720
 721 static int copy_argv (char *argv[])
 722 {
 723         int i;
 724
 725         for (i = 0; argv[i]; i++) {
 726                 if (!(argv[i] = strdup(argv[i]))) {
 727                         rprintf (FERROR, "out of memory at %s(%d)\n",
 728                                  __FILE__, __LINE__);
 729                         return RERR_MALLOC;
 730                 }
 731         }
 732
 733         return 0;
 734 }
 735
 736
 737 /**
 738  * Start a client for either type of remote connection.  Work out
 739  * whether the arguments request a remote shell or rsyncd connection,
 740  * and call the appropriate connection function, then run_client.
 741  *
 742  * Calls either start_socket_client (for sockets) or do_cmd and
 743  * client_run (for ssh).
 744  **/
 745 static int start_client(int argc, char *argv[])
 746 {
 747         char *p;
 748         char *shell_machine = NULL;
 749         char *shell_path = NULL;
 750         char *shell_user = NULL;
 751         int ret;
 752         pid_t pid;
 753         int f_in,f_out;
 754         int rc;
 755
 756         /* Don't clobber argv[] so that ps(1) can still show the right
 757          * command line. */
 758         if ((rc = copy_argv(argv)))
 759                 return rc;
 760
 761         /* rsync:// always uses rsync server over direct socket connection */
 762         if (strncasecmp(URL_PREFIX, argv[0], strlen(URL_PREFIX)) == 0
 763             && !read_batch) {
 764                 char *host, *path;
 765
 766                 host = argv[0] + strlen(URL_PREFIX);
 767                 p = strchr(host,'/');
 768                 if (p) {
 769                         *p = 0;
 770                         path = p+1;
 771                 } else {
 772                         path = "";
 773                 }
 774                 p = strchr(host,':');
 775                 if (p) {
 776                         rsync_port = atoi(p+1);
 777                         *p = 0;
 778                 }
 779                 return start_socket_client(host, path, argc-1, argv+1);
 780         }
 781
 782         if (!read_batch) { /* for read_batch, NO source is specified */
 783                 p = find_colon(argv[0]);
 784                 if (p) { /* source is remote */
 785                         if (remote_filesfrom_file
 786                          && remote_filesfrom_file != files_from + 1
 787                          && strncmp(files_from, argv[0], p-argv[0]+1) != 0) {
 788                                 rprintf(FERROR,
 789                                         "--files-from hostname is not transfer hostname\n");
 790                                 exit_cleanup(RERR_SYNTAX);
 791                         }
 792                         if (p[1] == ':') { /* double colon */
 793                                 *p = 0;
 794                                 if (!shell_cmd) {
 795                                         return start_socket_client(argv[0], p+2,
 796                                                                    argc-1, argv+1);
 797                                 }
 798                                 p++;
 799                                 daemon_over_rsh = 1;
 800                         }
 801
 802                         if (argc < 1) { /* destination required */
 803                                 usage(FERROR);
 804                                 exit_cleanup(RERR_SYNTAX);
 805                         }
 806
 807                         am_sender = 0;
 808                         *p = 0;
 809                         shell_machine = argv[0];
 810                         shell_path = p+1;
 811                         argv++;
 812                 } else { /* source is local */
 813                         am_sender = 1;
 814
 815                         /* rsync:// destination uses rsync server over direct socket */
 816                         if (strncasecmp(URL_PREFIX, argv[argc-1], strlen(URL_PREFIX)) == 0) {
 817                                 char *host, *path;
 818
 819                                 host = argv[argc-1] + strlen(URL_PREFIX);
 820                                 p = strchr(host,'/');
 821                                 if (p) {
 822                                         *p = 0;
 823                                         path = p+1;
 824                                 } else {
 825                                         path = "";
 826                                 }
 827                                 p = strchr(host,':');
 828                                 if (p) {
 829                                         rsync_port = atoi(p+1);
 830                                         *p = 0;
 831                                 }
 832                                 return start_socket_client(host, path, argc-1, argv);
 833                         }
 834
 835                         p = find_colon(argv[argc-1]); /* look in dest arg */
 836                         if (p && remote_filesfrom_file
 837                          && remote_filesfrom_file != files_from + 1
 838                          && strncmp(files_from, argv[argc-1], p-argv[argc-1]+1) != 0) {
 839                                 rprintf(FERROR,
 840                                         "--files-from hostname is not transfer hostname\n");
 841                                 exit_cleanup(RERR_SYNTAX);
 842                         }
 843                         if (!p) { /* no colon found, so src & dest are local */
 844                                 local_server = 1;
 845                                 if (remote_filesfrom_file) {
 846                                         rprintf(FERROR,
 847                                                 "--files-from is remote but transfer is local\n");
 848                                         exit_cleanup(RERR_SYNTAX);
 849                                 }
 850                         } else if (p[1] == ':') { /* double colon */
 851                                 *p = 0;
 852                                 if (!shell_cmd) {
 853                                         return start_socket_client(argv[argc-1], p+2,
 854                                                                    argc-1, argv);
 855                                 }
 856                                 p++;
 857                                 daemon_over_rsh = 1;
 858                         }
 859
 860                         if (argc < 2) {
 861                                 usage(FERROR);
 862                                 exit_cleanup(RERR_SYNTAX);
 863                         }
 864
 865                         if (local_server) {
 866                                 shell_machine = NULL;
 867                                 shell_path = argv[argc-1];
 868                         } else {
 869                                 *p = 0;
 870                                 shell_machine = argv[argc-1];
 871                                 shell_path = p+1;
 872                         }
 873                 }
 874                 argc--;
 875         } else {  /* read_batch */
 876                 local_server = 1;
 877                 shell_path = argv[argc-1];
 878                 if (find_colon(shell_path)) {
 879                         rprintf(FERROR, "remote destination is not allowed with --read-batch\n");
 880                         exit_cleanup(RERR_SYNTAX);
 881                 }
 882         }
 883
 884         if (shell_machine) {
 885                 p = strrchr(shell_machine,'@');
 886                 if (p) {
 887                         *p = 0;
 888                         shell_user = shell_machine;
 889                         shell_machine = p+1;
 890                 }
 891         }
 892
 893         if (verbose > 3) {
 894                 rprintf(FINFO,"cmd=%s machine=%s user=%s path=%s\n",
 895                         shell_cmd?shell_cmd:"",
 896                         shell_machine?shell_machine:"",
 897                         shell_user?shell_user:"",
 898                         shell_path?shell_path:"");
 899         }
 900
 901         /* for remote source, only single dest arg can remain ... */
 902         if (!am_sender && argc > 1) {
 903                 usage(FERROR);
 904                 exit_cleanup(RERR_SYNTAX);
 905         }
 906
 907         /* ... or no dest at all */
 908         if (!am_sender && argc == 0) {
 909                 list_only = 1;
 910         }
 911
 912         pid = do_cmd(shell_cmd,shell_machine,shell_user,shell_path,
 913                      &f_in,&f_out);
 914
 915         /* if we're running an rsync server on the remote host over a
 916          * remote shell command, we need to do the RSYNCD protocol first */
 917         if (daemon_over_rsh) {
 918                 int tmpret;
 919                 tmpret = start_inband_exchange(shell_user, shell_path,
 920                                                f_in, f_out, argc);
 921                 if (tmpret < 0)
 922                         return tmpret;
 923         }
 924
 925         ret = client_run(f_in, f_out, pid, argc, argv);
 926
 927         fflush(stdout);
 928         fflush(stderr);
 929
 930         return ret;
 931 }
 932
 933
 934 static RETSIGTYPE sigusr1_handler(UNUSED(int val))
 935 {
 936         exit_cleanup(RERR_SIGNAL);
 937 }
 938
 939 static RETSIGTYPE sigusr2_handler(UNUSED(int val))
 940 {
 941         if (log_got_error) _exit(RERR_PARTIAL);
 942         _exit(0);
 943 }
 944
 945 static RETSIGTYPE sigchld_handler(UNUSED(int val))
 946 {
 947 #ifdef WNOHANG
 948         int cnt, status;
 949         pid_t pid;
 950         /* An empty waitpid() loop was put here by Tridge and we could never
 951          * get him to explain why he put it in, so rather than taking it
 952          * out we're instead saving the child exit statuses for later use.
 953          * The waitpid() loop presumably eliminates all possibility of leaving
 954          * zombie children, maybe that's why he did it.
 955          */
 956         while ((pid = waitpid(-1, &status, WNOHANG)) > 0) {
 957                 /* save the child's exit status */
 958                 for (cnt = 0; cnt < MAXCHILDPROCS; cnt++) {
 959                         if (pid_stat_table[cnt].pid == 0) {
 960                                 pid_stat_table[cnt].pid = pid;
 961                                 pid_stat_table[cnt].status = status;
 962                                 break;
 963                         }
 964                 }
 965         }
 966 #endif
 967 }
 968
 969
 970 /**
 971  * This routine catches signals and tries to send them to gdb.
 972  *
 973  * Because it's called from inside a signal handler it ought not to
 974  * use too many library routines.
 975  *
 976  * @todo Perhaps use "screen -X" instead/as well, to help people
 977  * debugging without easy access to X.  Perhaps use an environment
 978  * variable, or just call a script?
 979  *
 980  * @todo The /proc/ magic probably only works on Linux (and
 981  * Solaris?)  Can we be more portable?
 982  **/
 983 #ifdef MAINTAINER_MODE
 984 const char *get_panic_action(void)
 985 {
 986         const char *cmd_fmt = getenv("RSYNC_PANIC_ACTION");
 987
 988         if (cmd_fmt)
 989                 return cmd_fmt;
 990         else
 991                 return "xterm -display :0 -T Panic -n Panic "
 992                         "-e gdb /proc/%d/exe %d";
 993 }
 994
 995
 996 /**
 997  * Handle a fatal signal by launching a debugger, controlled by $RSYNC_PANIC_ACTION.
 998  *
 999  * This signal handler is only installed if we were configured with
1000  * --enable-maintainer-mode.  Perhaps it should always be on and we
1001  * should just look at the environment variable, but I'm a bit leery
1002  * of a signal sending us into a busy loop.
1003  **/
1004 static RETSIGTYPE rsync_panic_handler(UNUSED(int whatsig))
1005 {
1006         char cmd_buf[300];
1007         int ret;
1008
1009         sprintf(cmd_buf, get_panic_action(),
1010                 getpid(), getpid());
1011
1012         /* Unless we failed to execute gdb, we allow the process to
1013          * continue.  I'm not sure if that's right. */
1014         ret = system(cmd_buf);
1015         if (ret)
1016                 _exit(ret);
1017 }
1018 #endif
1019
1020
1021 int main(int argc,char *argv[])
1022 {
1023         int ret;
1024         int orig_argc = argc;
1025         char **orig_argv = argv;
1026
1027         signal(SIGUSR1, sigusr1_handler);
1028         signal(SIGUSR2, sigusr2_handler);
1029         signal(SIGCHLD, sigchld_handler);
1030 #ifdef MAINTAINER_MODE
1031         signal(SIGSEGV, rsync_panic_handler);
1032         signal(SIGFPE, rsync_panic_handler);
1033         signal(SIGABRT, rsync_panic_handler);
1034         signal(SIGBUS, rsync_panic_handler);
1035 #endif /* def MAINTAINER_MODE */
1036
1037         starttime = time(NULL);
1038         am_root = (MY_UID() == 0);
1039
1040         memset(&stats, 0, sizeof(stats));
1041
1042         if (argc < 2) {
1043                 usage(FERROR);
1044                 exit_cleanup(RERR_SYNTAX);
1045         }
1046
1047         /* we set a 0 umask so that correct file permissions can be
1048          * carried across */
1049         orig_umask = (int)umask(0);
1050
1051         if (!parse_arguments(&argc, (const char ***) &argv, 1)) {
1052                 /* FIXME: We ought to call the same error-handling
1053                  * code here, rather than relying on getopt. */
1054                 option_error();
1055                 exit_cleanup(RERR_SYNTAX);
1056         }
1057
1058         signal(SIGINT,SIGNAL_CAST sig_int);
1059         signal(SIGHUP,SIGNAL_CAST sig_int);
1060         signal(SIGTERM,SIGNAL_CAST sig_int);
1061
1062         /* Ignore SIGPIPE; we consistently check error codes and will
1063          * see the EPIPE. */
1064         signal(SIGPIPE, SIG_IGN);
1065
1066         /* Initialize push_dir here because on some old systems getcwd
1067          * (implemented by forking "pwd" and reading its output) doesn't
1068          * work when there are other child processes.  Also, on all systems
1069          * that implement getcwd that way "pwd" can't be found after chroot. */
1070         push_dir(NULL);
1071
1072         init_flist();
1073
1074         if (write_batch || read_batch) {
1075                 if (write_batch)
1076                         write_batch_shell_file(orig_argc, orig_argv, argc);
1077
1078                 if (read_batch && strcmp(batch_name, "-") == 0)
1079                         batch_fd = STDIN_FILENO;
1080                 else {
1081                         batch_fd = do_open(batch_name,
1082                                    write_batch ? O_WRONLY | O_CREAT | O_TRUNC
1083                                    : O_RDONLY, S_IRUSR | S_IWUSR);
1084                 }
1085                 if (batch_fd < 0) {
1086                         rsyserr(FERROR, errno, "Batch file %s open error",
1087                                 batch_name);
1088                         exit_cleanup(RERR_FILEIO);
1089                 }
1090                 if (read_batch)
1091                         read_stream_flags(batch_fd);
1092         }
1093
1094         if (am_daemon && !am_server)
1095                 return daemon_main();
1096
1097         if (argc < 1) {
1098                 usage(FERROR);
1099                 exit_cleanup(RERR_SYNTAX);
1100         }
1101
1102         if (dry_run)
1103                 verbose = MAX(verbose,1);
1104
1105         if (am_server) {
1106                 set_nonblocking(STDIN_FILENO);
1107                 set_nonblocking(STDOUT_FILENO);
1108                 if (am_daemon)
1109                         return start_daemon(STDIN_FILENO, STDOUT_FILENO);
1110                 start_server(STDIN_FILENO, STDOUT_FILENO, argc, argv);
1111         }
1112
1113         ret = start_client(argc, argv);
1114         if (ret == -1)
1115                 exit_cleanup(RERR_STARTCLIENT);
1116         else
1117                 exit_cleanup(ret);
1118
1119         return ret;
1120 }