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