- Improved option_error() to make sure that the user sees the error in
[rsync/rsync.git] / 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 preserve_hard_links;
47 extern int protocol_version;
48 extern int recurse;
49 extern int relative_paths;
50 extern int rsync_port;
51 extern int read_batch;
52 extern int write_batch;
53 extern int filesfrom_fd;
54 extern pid_t cleanup_child_pid;
55 extern char *files_from;
56 extern char *remote_filesfrom_file;
57 extern char *rsync_path;
58 extern char *shell_cmd;
59 extern struct file_list *batch_flist;
60
61
62 /* there's probably never more than at most 2 outstanding child processes,
63  * but set it higher just in case.
64  */
65 #define MAXCHILDPROCS 5
66
67 struct pid_status {
68         pid_t pid;
69         int   status;
70 } pid_stat_table[MAXCHILDPROCS];
71
72 static void show_malloc_stats(void);
73
74 /****************************************************************************
75 wait for a process to exit, calling io_flush while waiting
76 ****************************************************************************/
77 void wait_process(pid_t pid, int *status)
78 {
79         pid_t waited_pid;
80         int cnt;
81
82         while ((waited_pid = waitpid(pid, status, WNOHANG)) == 0) {
83                 msleep(20);
84                 io_flush(FULL_FLUSH);
85         }
86
87         if ((waited_pid == -1) && (errno == ECHILD)) {
88                 /* status of requested child no longer available.
89                  * check to see if it was processed by the sigchld_handler.
90                  */
91                 for (cnt = 0;  cnt < MAXCHILDPROCS; cnt++) {
92                         if (pid == pid_stat_table[cnt].pid) {
93                                 *status = pid_stat_table[cnt].status;
94                                 pid_stat_table[cnt].pid = 0;
95                                 break;
96                         }
97                 }
98         }
99
100         /* TODO: If the child exited on a signal, then log an
101          * appropriate error message.  Perhaps we should also accept a
102          * message describing the purpose of the child.  Also indicate
103          * this to the caller so that thhey know something went
104          * wrong.  */
105         *status = WEXITSTATUS(*status);
106 }
107
108 static void report(int f)
109 {
110         time_t t = time(NULL);
111
112         if (do_stats && verbose > 1) {
113                 /* These come out from every process */
114                 show_malloc_stats();
115                 show_flist_stats();
116         }
117
118         if (am_generator)
119                 return;
120
121         if (am_daemon) {
122                 log_exit(0, __FILE__, __LINE__);
123                 if (f == -1 || !am_sender) return;
124         }
125
126         if (am_server) {
127                 if (am_sender) {
128                         int64 w;
129                         /* store total_written in a temporary
130                          * because write_longint changes it */
131                         w = stats.total_written;
132                         write_longint(f,stats.total_read);
133                         write_longint(f,w);
134                         write_longint(f,stats.total_size);
135                 }
136                 return;
137         }
138
139         /* this is the client */
140
141         if (!am_sender) {
142                 int64 r;
143                 stats.total_written = read_longint(f);
144                 /* store total_read in a temporary, read_longint changes it */
145                 r = read_longint(f);
146                 stats.total_size = read_longint(f);
147                 stats.total_read = r;
148         }
149
150         if (do_stats) {
151                 rprintf(FINFO,"\nNumber of files: %d\n", stats.num_files);
152                 rprintf(FINFO,"Number of files transferred: %d\n",
153                         stats.num_transferred_files);
154                 rprintf(FINFO,"Total file size: %.0f bytes\n",
155                         (double)stats.total_size);
156                 rprintf(FINFO,"Total transferred file size: %.0f bytes\n",
157                         (double)stats.total_transferred_size);
158                 rprintf(FINFO,"Literal data: %.0f bytes\n",
159                         (double)stats.literal_data);
160                 rprintf(FINFO,"Matched data: %.0f bytes\n",
161                         (double)stats.matched_data);
162                 rprintf(FINFO,"File list size: %d\n", stats.flist_size);
163                 rprintf(FINFO,"Total bytes written: %.0f\n",
164                         (double)stats.total_written);
165                 rprintf(FINFO,"Total bytes read: %.0f\n",
166                         (double)stats.total_read);
167         }
168
169         if (verbose || do_stats) {
170                 rprintf(FINFO,"\nwrote %.0f bytes  read %.0f bytes  %.2f bytes/sec\n",
171                         (double)stats.total_written,
172                         (double)stats.total_read,
173                         (stats.total_written+stats.total_read)/(0.5 + (t-starttime)));
174                 rprintf(FINFO,"total size is %.0f  speedup is %.2f\n",
175                         (double)stats.total_size,
176                         (1.0*stats.total_size)/(stats.total_written+stats.total_read));
177         }
178
179         fflush(stdout);
180         fflush(stderr);
181 }
182
183
184 /**
185  * If our C library can get malloc statistics, then show them to FINFO
186  **/
187 static void show_malloc_stats(void)
188 {
189 #ifdef HAVE_MALLINFO
190         struct mallinfo mi;
191
192         mi = mallinfo();
193
194         rprintf(FINFO, "\n" RSYNC_NAME "[%d] (%s%s%s) heap statistics:\n",
195                 getpid(),
196                 am_server ? "server " : "",
197                 am_daemon ? "daemon " : "",
198                 who_am_i());
199         rprintf(FINFO, "  arena:     %10d   (bytes from sbrk)\n", mi.arena);
200         rprintf(FINFO, "  ordblks:   %10d   (chunks not in use)\n", mi.ordblks);
201         rprintf(FINFO, "  smblks:    %10d\n", mi.smblks);
202         rprintf(FINFO, "  hblks:     %10d   (chunks from mmap)\n", mi.hblks);
203         rprintf(FINFO, "  hblkhd:    %10d   (bytes from mmap)\n", mi.hblkhd);
204         rprintf(FINFO, "  allmem:    %10d   (bytes from sbrk + mmap)\n",
205             mi.arena + mi.hblkhd);
206         rprintf(FINFO, "  usmblks:   %10d\n", mi.usmblks);
207         rprintf(FINFO, "  fsmblks:   %10d\n", mi.fsmblks);
208         rprintf(FINFO, "  uordblks:  %10d   (bytes used)\n", mi.uordblks);
209         rprintf(FINFO, "  fordblks:  %10d   (bytes free)\n", mi.fordblks);
210         rprintf(FINFO, "  keepcost:  %10d   (bytes in releasable chunk)\n", mi.keepcost);
211 #endif /* HAVE_MALLINFO */
212 }
213
214
215 /* Start the remote shell.   cmd may be NULL to use the default. */
216 static pid_t do_cmd(char *cmd, char *machine, char *user, char *path,
217                     int *f_in, int *f_out)
218 {
219         int i, argc = 0;
220         char *args[100];
221         pid_t ret;
222         char *tok, *dir = NULL;
223         int dash_l_set = 0;
224
225         if (!read_batch && !local_server) {
226                 char *rsh_env = getenv(RSYNC_RSH_ENV);
227                 if (!cmd)
228                         cmd = rsh_env;
229                 if (!cmd)
230                         cmd = RSYNC_RSH;
231                 cmd = strdup(cmd);
232                 if (!cmd)
233                         goto oom;
234
235                 for (tok = strtok(cmd, " "); tok; tok = strtok(NULL, " "))
236                         args[argc++] = tok;
237
238                 /* check to see if we've already been given '-l user' in
239                  * the remote-shell command */
240                 for (i = 0; i < argc-1; i++) {
241                         if (!strcmp(args[i], "-l") && args[i+1][0] != '-')
242                                 dash_l_set = 1;
243                 }
244
245 #if HAVE_REMSH
246                 /* remsh (on HPUX) takes the arguments the other way around */
247                 args[argc++] = machine;
248                 if (user && !(daemon_over_rsh && dash_l_set)) {
249                         args[argc++] = "-l";
250                         args[argc++] = user;
251                 }
252 #else
253                 if (user && !(daemon_over_rsh && dash_l_set)) {
254                         args[argc++] = "-l";
255                         args[argc++] = user;
256                 }
257                 args[argc++] = machine;
258 #endif
259
260                 args[argc++] = rsync_path;
261
262                 if (blocking_io < 0) {
263                         char *cp;
264                         if ((cp = strrchr(cmd, '/')) != NULL)
265                                 cp++;
266                         else
267                                 cp = cmd;
268                         if (strcmp(cp, "rsh") == 0 || strcmp(cp, "remsh") == 0)
269                                 blocking_io = 1;
270                 }
271
272                 server_options(args,&argc);
273         }
274
275         args[argc++] = ".";
276
277         if (!daemon_over_rsh && path && *path)
278                 args[argc++] = path;
279
280         if (argc >= (int)(sizeof args / sizeof args[0])) {
281                 rprintf(FERROR, "internal: args[] overflowed in do_cmd()\n");
282                 exit_cleanup(RERR_MALLOC); /* XXX Need better RERR? */
283         }
284
285         args[argc] = NULL;
286
287         if (verbose > 3) {
288                 rprintf(FINFO,"cmd=");
289                 for (i=0;i<argc;i++)
290                         rprintf(FINFO,"%s ",args[i]);
291                 rprintf(FINFO,"\n");
292         }
293
294         if (local_server) {
295                 if (read_batch)
296                         create_flist_from_batch(); /* sets batch_flist */
297                 ret = local_child(argc, args, f_in, f_out, child_main);
298         } else {
299                 ret = piped_child(args,f_in,f_out);
300         }
301
302         if (dir) free(dir);
303
304         return ret;
305
306 oom:
307         out_of_memory("do_cmd");
308         return 0; /* not reached */
309 }
310
311
312 static char *get_local_name(struct file_list *flist,char *name)
313 {
314         STRUCT_STAT st;
315         int e;
316
317         if (verbose > 2)
318                 rprintf(FINFO,"get_local_name count=%d %s\n",
319                         flist->count, NS(name));
320
321         if (!name)
322                 return NULL;
323
324         if (do_stat(name,&st) == 0) {
325                 if (S_ISDIR(st.st_mode)) {
326                         if (!push_dir(name)) {
327                                 rsyserr(FERROR, errno, "push_dir#1 %s failed",
328                                         full_fname(name));
329                                 exit_cleanup(RERR_FILESELECT);
330                         }
331                         return NULL;
332                 }
333                 if (flist->count > 1) {
334                         rprintf(FERROR,"ERROR: destination must be a directory when copying more than 1 file\n");
335                         exit_cleanup(RERR_FILESELECT);
336                 }
337                 return name;
338         }
339
340         if (flist->count <= 1 && ((e = strlen(name)) <= 1 || name[e-1] != '/'))
341                 return name;
342
343         if (do_mkdir(name,0777 & ~orig_umask) != 0) {
344                 rsyserr(FERROR, errno, "mkdir %s failed", full_fname(name));
345                 exit_cleanup(RERR_FILEIO);
346         } else {
347                 if (verbose > 0)
348                         rprintf(FINFO,"created directory %s\n",name);
349         }
350
351         if (!push_dir(name)) {
352                 rsyserr(FERROR, errno, "push_dir#2 %s failed",
353                         full_fname(name));
354                 exit_cleanup(RERR_FILESELECT);
355         }
356
357         return NULL;
358 }
359
360
361 static void do_server_sender(int f_in, int f_out, int argc,char *argv[])
362 {
363         int i;
364         struct file_list *flist;
365         char *dir = argv[0];
366
367         if (verbose > 2) {
368                 rprintf(FINFO, "server_sender starting pid=%ld\n",
369                         (long)getpid());
370         }
371
372         if (am_daemon && lp_write_only(module_id) && am_sender) {
373                 rprintf(FERROR, "ERROR: module is write only\n");
374                 exit_cleanup(RERR_SYNTAX);
375                 return;
376         }
377
378         if (!relative_paths && !push_dir(dir)) {
379                 rsyserr(FERROR, errno, "push_dir#3 %s failed",
380                         full_fname(dir));
381                 exit_cleanup(RERR_FILESELECT);
382         }
383         argc--;
384         argv++;
385
386         if (strcmp(dir,".")) {
387                 int l = strlen(dir);
388                 if (strcmp(dir,"/") == 0)
389                         l = 0;
390                 for (i=0;i<argc;i++)
391                         argv[i] += l+1;
392         }
393
394         if (argc == 0 && recurse) {
395                 argc=1;
396                 argv--;
397                 argv[0] = ".";
398         }
399
400         flist = send_file_list(f_out,argc,argv);
401         if (!flist || flist->count == 0) {
402                 exit_cleanup(0);
403         }
404
405         io_start_buffering_in(f_in);
406         io_start_buffering_out(f_out);
407         send_files(flist,f_out,f_in);
408         io_flush(FULL_FLUSH);
409         report(f_out);
410         if (protocol_version >= 24) {
411                 /* final goodbye message */
412                 read_int(f_in);
413         }
414         io_flush(FULL_FLUSH);
415         exit_cleanup(0);
416 }
417
418
419 static int do_recv(int f_in,int f_out,struct file_list *flist,char *local_name)
420 {
421         int pid;
422         int status=0;
423         int error_pipe[2];
424
425         if (preserve_hard_links)
426                 init_hard_links(flist);
427
428         if (!delete_after) {
429                 /* I moved this here from recv_files() to prevent a race condition */
430                 if (recurse && delete_mode && !local_name && flist->count>0) {
431                         delete_files(flist);
432                 }
433         }
434
435         if (fd_pair(error_pipe) < 0) {
436                 rprintf(FERROR,"error pipe failed in do_recv\n");
437                 exit_cleanup(RERR_SOCKETIO);
438         }
439
440         io_flush(NORMAL_FLUSH);
441
442         if ((pid=do_fork()) == 0) {
443                 close(error_pipe[0]);
444                 if (f_in != f_out) close(f_out);
445
446                 /* we can't let two processes write to the socket at one time */
447                 io_multiplexing_close();
448
449                 /* set place to send errors */
450                 set_msg_fd_out(error_pipe[1]);
451
452                 recv_files(f_in,flist,local_name);
453                 io_flush(FULL_FLUSH);
454                 report(f_in);
455
456                 send_msg(MSG_DONE, "", 0);
457                 io_flush(FULL_FLUSH);
458                 /* finally we go to sleep until our parent kills us
459                  * with a USR2 signal. We sleep for a short time as on
460                  * some OSes a signal won't interrupt a sleep! */
461                 while (1)
462                         msleep(20);
463         }
464
465         am_generator = 1;
466
467         close(error_pipe[1]);
468         if (f_in != f_out) close(f_in);
469
470         io_start_buffering_out(f_out);
471
472         set_msg_fd_in(error_pipe[0]);
473
474         generate_files(f_out, flist, local_name);
475
476         get_redo_num(); /* Read final MSG_DONE and any prior messages. */
477         report(-1);
478         io_flush(FULL_FLUSH);
479         if (protocol_version >= 24) {
480                 /* send a final goodbye message */
481                 write_int(f_out, -1);
482         }
483         io_flush(FULL_FLUSH);
484
485         set_msg_fd_in(-1);
486         kill(pid, SIGUSR2);
487         wait_process(pid, &status);
488         return status;
489 }
490
491
492 static void do_server_recv(int f_in, int f_out, int argc,char *argv[])
493 {
494         int status;
495         struct file_list *flist;
496         char *local_name = NULL;
497         char *dir = NULL;
498
499         if (verbose > 2) {
500                 rprintf(FINFO, "server_recv(%d) starting pid=%ld\n",
501                         argc, (long)getpid());
502         }
503
504         if (am_daemon && lp_read_only(module_id) && !am_sender) {
505                 rprintf(FERROR,"ERROR: module is read only\n");
506                 exit_cleanup(RERR_SYNTAX);
507                 return;
508         }
509
510
511         if (argc > 0) {
512                 dir = argv[0];
513                 argc--;
514                 argv++;
515                 if (!am_daemon && !push_dir(dir)) {
516                         rsyserr(FERROR, errno, "push_dir#4 %s failed",
517                                 full_fname(dir));
518                         exit_cleanup(RERR_FILESELECT);
519                 }
520         }
521
522         io_start_buffering_in(f_in);
523         if (delete_mode && !delete_excluded)
524                 recv_exclude_list(f_in);
525
526         if (filesfrom_fd >= 0) {
527                 /* We're receiving the file info from the sender, so we need
528                  * the IO routines to automatically write out the names onto
529                  * our f_out socket as we read the list info from the sender.
530                  * This avoids both deadlock and extra delays/buffers. */
531                 io_set_filesfrom_fds(filesfrom_fd, f_out);
532                 filesfrom_fd = -1;
533         }
534
535         if (read_batch)
536                 flist = batch_flist;
537         else
538                 flist = recv_file_list(f_in);
539         if (!flist) {
540                 rprintf(FERROR,"server_recv: recv_file_list error\n");
541                 exit_cleanup(RERR_FILESELECT);
542         }
543
544         if (argc > 0) {
545                 if (strcmp(dir,".")) {
546                         argv[0] += strlen(dir);
547                         if (argv[0][0] == '/') argv[0]++;
548                 }
549                 local_name = get_local_name(flist,argv[0]);
550         }
551
552         status = do_recv(f_in,f_out,flist,local_name);
553         exit_cleanup(status);
554 }
555
556
557 int child_main(int argc, char *argv[])
558 {
559         start_server(STDIN_FILENO, STDOUT_FILENO, argc, argv);
560         return 0;
561 }
562
563
564 void start_server(int f_in, int f_out, int argc, char *argv[])
565 {
566         setup_protocol(f_out, f_in);
567
568         set_nonblocking(f_in);
569         set_nonblocking(f_out);
570
571         if (protocol_version >= 23)
572                 io_start_multiplex_out(f_out);
573
574         if (am_sender) {
575                 if (!read_batch) {
576                         recv_exclude_list(f_in);
577                         if (cvs_exclude)
578                                 add_cvs_excludes();
579                 }
580                 do_server_sender(f_in, f_out, argc, argv);
581         } else {
582                 do_server_recv(f_in, f_out, argc, argv);
583         }
584         exit_cleanup(0);
585 }
586
587
588 /*
589  * This is called once the connection has been negotiated.  It is used
590  * for rsyncd, remote-shell, and local connections.
591  */
592 int client_run(int f_in, int f_out, pid_t pid, int argc, char *argv[])
593 {
594         struct file_list *flist = NULL;
595         int status = 0, status2 = 0;
596         char *local_name = NULL;
597
598         cleanup_child_pid = pid;
599         if (read_batch)
600                 flist = batch_flist;
601
602         set_nonblocking(f_in);
603         set_nonblocking(f_out);
604
605         setup_protocol(f_out,f_in);
606
607         if (protocol_version >= 23)
608                 io_start_multiplex_in(f_in);
609
610         if (am_sender) {
611                 io_start_buffering_out(f_out);
612                 if (cvs_exclude)
613                         add_cvs_excludes();
614                 if (delete_mode && !delete_excluded)
615                         send_exclude_list(f_out);
616                 if (remote_filesfrom_file)
617                         filesfrom_fd = f_in;
618                 if (!read_batch) /* don't write to pipe */
619                         flist = send_file_list(f_out,argc,argv);
620                 if (verbose > 3)
621                         rprintf(FINFO,"file list sent\n");
622
623                 io_flush(NORMAL_FLUSH);
624                 send_files(flist,f_out,f_in);
625                 io_flush(FULL_FLUSH);
626                 if (protocol_version >= 24) {
627                         /* final goodbye message */
628                         read_int(f_in);
629                 }
630                 if (pid != -1) {
631                         if (verbose > 3)
632                                 rprintf(FINFO,"client_run waiting on %d\n", (int) pid);
633                         io_flush(FULL_FLUSH);
634                         wait_process(pid, &status);
635                 }
636                 report(-1);
637                 io_flush(FULL_FLUSH);
638                 exit_cleanup(status);
639         }
640
641         if (argc == 0)
642                 list_only = 1;
643
644         if (!read_batch)
645                 send_exclude_list(f_out);
646
647         if (filesfrom_fd >= 0) {
648                 io_set_filesfrom_fds(filesfrom_fd, f_out);
649                 filesfrom_fd = -1;
650         }
651
652         flist = recv_file_list(f_in);
653         if (!flist || flist->count == 0) {
654                 rprintf(FINFO, "client: nothing to do: "
655                         "perhaps you need to specify some filenames or "
656                         "the --recursive option?\n");
657                 exit_cleanup(0);
658         }
659
660         local_name = get_local_name(flist,argv[0]);
661
662         status2 = do_recv(f_in,f_out,flist,local_name);
663
664         if (pid != -1) {
665                 if (verbose > 3)
666                         rprintf(FINFO,"client_run2 waiting on %d\n", (int) pid);
667                 io_flush(FULL_FLUSH);
668                 wait_process(pid, &status);
669         }
670
671         return MAX(status, status2);
672 }
673
674 static int copy_argv (char *argv[])
675 {
676         int i;
677
678         for (i = 0; argv[i]; i++) {
679                 if (!(argv[i] = strdup(argv[i]))) {
680                         rprintf (FERROR, "out of memory at %s(%d)\n",
681                                  __FILE__, __LINE__);
682                         return RERR_MALLOC;
683                 }
684         }
685
686         return 0;
687 }
688
689
690 /**
691  * Start a client for either type of remote connection.  Work out
692  * whether the arguments request a remote shell or rsyncd connection,
693  * and call the appropriate connection function, then run_client.
694  *
695  * Calls either start_socket_client (for sockets) or do_cmd and
696  * client_run (for ssh).
697  **/
698 static int start_client(int argc, char *argv[])
699 {
700         char *p;
701         char *shell_machine = NULL;
702         char *shell_path = NULL;
703         char *shell_user = NULL;
704         int ret;
705         pid_t pid;
706         int f_in,f_out;
707         int rc;
708
709         /* Don't clobber argv[] so that ps(1) can still show the right
710          * command line. */
711         if ((rc = copy_argv(argv)))
712                 return rc;
713
714         /* rsync:// always uses rsync server over direct socket connection */
715         if (strncasecmp(URL_PREFIX, argv[0], strlen(URL_PREFIX)) == 0) {
716                 char *host, *path;
717
718                 host = argv[0] + strlen(URL_PREFIX);
719                 p = strchr(host,'/');
720                 if (p) {
721                         *p = 0;
722                         path = p+1;
723                 } else {
724                         path = "";
725                 }
726                 p = strchr(host,':');
727                 if (p) {
728                         rsync_port = atoi(p+1);
729                         *p = 0;
730                 }
731                 return start_socket_client(host, path, argc-1, argv+1);
732         }
733
734         if (!read_batch) {
735                 p = find_colon(argv[0]);
736                 if (p) {
737                         if (remote_filesfrom_file
738                          && remote_filesfrom_file != files_from + 1
739                          && strncmp(files_from, argv[0], p-argv[0]+1) != 0) {
740                                 rprintf(FERROR,
741                                         "--files-from hostname is not transfer hostname\n");
742                                 exit_cleanup(RERR_SYNTAX);
743                         }
744                         if (p[1] == ':') { /* double colon */
745                                 *p = 0;
746                                 if (!shell_cmd) {
747                                         return start_socket_client(argv[0], p+2,
748                                                                    argc-1, argv+1);
749                                 }
750                                 p++;
751                                 daemon_over_rsh = 1;
752                         }
753
754                         if (argc < 1) {
755                                 usage(FERROR);
756                                 exit_cleanup(RERR_SYNTAX);
757                         }
758
759                         am_sender = 0;
760                         *p = 0;
761                         shell_machine = argv[0];
762                         shell_path = p+1;
763                         argc--;
764                         argv++;
765                 } else {
766                         am_sender = 1;
767
768                         /* rsync:// destination uses rsync server over direct socket */
769                         if (strncasecmp(URL_PREFIX, argv[argc-1], strlen(URL_PREFIX)) == 0) {
770                                 char *host, *path;
771
772                                 host = argv[argc-1] + strlen(URL_PREFIX);
773                                 p = strchr(host,'/');
774                                 if (p) {
775                                         *p = 0;
776                                         path = p+1;
777                                 } else {
778                                         path = "";
779                                 }
780                                 p = strchr(host,':');
781                                 if (p) {
782                                         rsync_port = atoi(p+1);
783                                         *p = 0;
784                                 }
785                                 return start_socket_client(host, path, argc-1, argv);
786                         }
787
788                         p = find_colon(argv[argc-1]);
789                         if (p && remote_filesfrom_file
790                          && remote_filesfrom_file != files_from + 1
791                          && strncmp(files_from, argv[argc-1], p-argv[argc-1]+1) != 0) {
792                                 rprintf(FERROR,
793                                         "--files-from hostname is not transfer hostname\n");
794                                 exit_cleanup(RERR_SYNTAX);
795                         }
796                         if (!p) {
797                                 local_server = 1;
798                                 if (remote_filesfrom_file) {
799                                         rprintf(FERROR,
800                                                 "--files-from is remote but transfer is local\n");
801                                         exit_cleanup(RERR_SYNTAX);
802                                 }
803                         } else if (p[1] == ':') { /* double colon */
804                                 *p = 0;
805                                 if (!shell_cmd) {
806                                         return start_socket_client(argv[argc-1], p+2,
807                                                                    argc-1, argv);
808                                 }
809                                 p++;
810                                 daemon_over_rsh = 1;
811                         }
812
813                         if (argc < 2) {
814                                 usage(FERROR);
815                                 exit_cleanup(RERR_SYNTAX);
816                         }
817
818                         if (local_server) {
819                                 shell_machine = NULL;
820                                 shell_path = argv[argc-1];
821                         } else {
822                                 *p = 0;
823                                 shell_machine = argv[argc-1];
824                                 shell_path = p+1;
825                         }
826                         argc--;
827                 }
828         } else {
829                 am_sender = 1;
830                 local_server = 1;
831                 shell_path = argv[argc-1];
832         }
833
834         if (shell_machine) {
835                 p = strrchr(shell_machine,'@');
836                 if (p) {
837                         *p = 0;
838                         shell_user = shell_machine;
839                         shell_machine = p+1;
840                 }
841         }
842
843         if (verbose > 3) {
844                 rprintf(FINFO,"cmd=%s machine=%s user=%s path=%s\n",
845                         shell_cmd?shell_cmd:"",
846                         shell_machine?shell_machine:"",
847                         shell_user?shell_user:"",
848                         shell_path?shell_path:"");
849         }
850
851         if (!am_sender && argc > 1) {
852                 usage(FERROR);
853                 exit_cleanup(RERR_SYNTAX);
854         }
855
856         if (argc == 0 && !am_sender) {
857                 list_only = 1;
858         }
859
860         pid = do_cmd(shell_cmd,shell_machine,shell_user,shell_path,
861                      &f_in,&f_out);
862
863         /* if we're running an rsync server on the remote host over a
864          * remote shell command, we need to do the RSYNCD protocol first */
865         if (daemon_over_rsh) {
866                 int tmpret;
867                 tmpret = start_inband_exchange(shell_user, shell_path,
868                                                f_in, f_out, argc);
869                 if (tmpret < 0)
870                         return tmpret;
871         }
872
873         ret = client_run(f_in, f_out, pid, argc, argv);
874
875         fflush(stdout);
876         fflush(stderr);
877
878         return ret;
879 }
880
881
882 static RETSIGTYPE sigusr1_handler(UNUSED(int val))
883 {
884         exit_cleanup(RERR_SIGNAL);
885 }
886
887 static RETSIGTYPE sigusr2_handler(UNUSED(int val))
888 {
889         if (log_got_error) _exit(RERR_PARTIAL);
890         _exit(0);
891 }
892
893 static RETSIGTYPE sigchld_handler(UNUSED(int val))
894 {
895 #ifdef WNOHANG
896         int cnt, status;
897         pid_t pid;
898         /* An empty waitpid() loop was put here by Tridge and we could never
899          * get him to explain why he put it in, so rather than taking it
900          * out we're instead saving the child exit statuses for later use.
901          * The waitpid() loop presumably eliminates all possibility of leaving
902          * zombie children, maybe that's why he did it.
903          */
904         while ((pid = waitpid(-1, &status, WNOHANG)) > 0) {
905                 /* save the child's exit status */
906                 for (cnt = 0; cnt < MAXCHILDPROCS; cnt++) {
907                         if (pid_stat_table[cnt].pid == 0) {
908                                 pid_stat_table[cnt].pid = pid;
909                                 pid_stat_table[cnt].status = status;
910                                 break;
911                         }
912                 }
913         }
914 #endif
915 }
916
917
918 /**
919  * This routine catches signals and tries to send them to gdb.
920  *
921  * Because it's called from inside a signal handler it ought not to
922  * use too many library routines.
923  *
924  * @todo Perhaps use "screen -X" instead/as well, to help people
925  * debugging without easy access to X.  Perhaps use an environment
926  * variable, or just call a script?
927  *
928  * @todo The /proc/ magic probably only works on Linux (and
929  * Solaris?)  Can we be more portable?
930  **/
931 #ifdef MAINTAINER_MODE
932 const char *get_panic_action(void)
933 {
934         const char *cmd_fmt = getenv("RSYNC_PANIC_ACTION");
935
936         if (cmd_fmt)
937                 return cmd_fmt;
938         else
939                 return "xterm -display :0 -T Panic -n Panic "
940                         "-e gdb /proc/%d/exe %d";
941 }
942
943
944 /**
945  * Handle a fatal signal by launching a debugger, controlled by $RSYNC_PANIC_ACTION.
946  *
947  * This signal handler is only installed if we were configured with
948  * --enable-maintainer-mode.  Perhaps it should always be on and we
949  * should just look at the environment variable, but I'm a bit leery
950  * of a signal sending us into a busy loop.
951  **/
952 static RETSIGTYPE rsync_panic_handler(UNUSED(int whatsig))
953 {
954         char cmd_buf[300];
955         int ret;
956
957         sprintf(cmd_buf, get_panic_action(),
958                 getpid(), getpid());
959
960         /* Unless we failed to execute gdb, we allow the process to
961          * continue.  I'm not sure if that's right. */
962         ret = system(cmd_buf);
963         if (ret)
964                 _exit(ret);
965 }
966 #endif
967
968
969 int main(int argc,char *argv[])
970 {
971         int ret;
972         int orig_argc;
973         char **orig_argv;
974
975         orig_argc = argc;
976         orig_argv = argv;
977
978         signal(SIGUSR1, sigusr1_handler);
979         signal(SIGUSR2, sigusr2_handler);
980         signal(SIGCHLD, sigchld_handler);
981 #ifdef MAINTAINER_MODE
982         signal(SIGSEGV, rsync_panic_handler);
983         signal(SIGFPE, rsync_panic_handler);
984         signal(SIGABRT, rsync_panic_handler);
985         signal(SIGBUS, rsync_panic_handler);
986 #endif /* def MAINTAINER_MODE */
987
988         starttime = time(NULL);
989         am_root = (MY_UID() == 0);
990
991         memset(&stats, 0, sizeof(stats));
992
993         if (argc < 2) {
994                 usage(FERROR);
995                 exit_cleanup(RERR_SYNTAX);
996         }
997
998         /* we set a 0 umask so that correct file permissions can be
999          * carried across */
1000         orig_umask = (int)umask(0);
1001
1002         if (!parse_arguments(&argc, (const char ***) &argv, 1)) {
1003                 /* FIXME: We ought to call the same error-handling
1004                  * code here, rather than relying on getopt. */
1005                 option_error();
1006                 exit_cleanup(RERR_SYNTAX);
1007         }
1008
1009         signal(SIGINT,SIGNAL_CAST sig_int);
1010         signal(SIGHUP,SIGNAL_CAST sig_int);
1011         signal(SIGTERM,SIGNAL_CAST sig_int);
1012
1013         /* Ignore SIGPIPE; we consistently check error codes and will
1014          * see the EPIPE. */
1015         signal(SIGPIPE, SIG_IGN);
1016
1017         /* Initialize push_dir here because on some old systems getcwd
1018          * (implemented by forking "pwd" and reading its output) doesn't
1019          * work when there are other child processes.  Also, on all systems
1020          * that implement getcwd that way "pwd" can't be found after chroot. */
1021         push_dir(NULL);
1022
1023         init_flist();
1024
1025         if (write_batch && !am_server) {
1026                 write_batch_argvs_file(orig_argc, orig_argv);
1027         }
1028
1029         if (am_daemon && !am_server)
1030                 return daemon_main();
1031
1032         if (argc < 1) {
1033                 usage(FERROR);
1034                 exit_cleanup(RERR_SYNTAX);
1035         }
1036
1037         if (dry_run)
1038                 verbose = MAX(verbose,1);
1039
1040         if (am_server) {
1041                 set_nonblocking(STDIN_FILENO);
1042                 set_nonblocking(STDOUT_FILENO);
1043                 if (am_daemon)
1044                         return start_daemon(STDIN_FILENO, STDOUT_FILENO);
1045                 start_server(STDIN_FILENO, STDOUT_FILENO, argc, argv);
1046         }
1047
1048         ret = start_client(argc, argv);
1049         if (ret == -1)
1050                 exit_cleanup(RERR_STARTCLIENT);
1051         else
1052                 exit_cleanup(ret);
1053
1054         return ret;
1055 }