Go back to requiring -r for deletes to happen.
[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_before;
37 extern int delete_after;
38 extern int delete_excluded;
39 extern int daemon_over_rsh;
40 extern int do_stats;
41 extern int dry_run;
42 extern int list_only;
43 extern int local_server;
44 extern int log_got_error;
45 extern int module_id;
46 extern int orig_umask;
47 extern int copy_links;
48 extern int keep_dirlinks;
49 extern int preserve_hard_links;
50 extern int protocol_version;
51 extern int recurse;
52 extern int relative_paths;
53 extern int rsync_port;
54 extern int whole_file;
55 extern int read_batch;
56 extern int write_batch;
57 extern int batch_fd;
58 extern int batch_gen_fd;
59 extern int filesfrom_fd;
60 extern pid_t cleanup_child_pid;
61 extern char *files_from;
62 extern char *remote_filesfrom_file;
63 extern char *partial_dir;
64 extern char *basis_dir[];
65 extern char *rsync_path;
66 extern char *shell_cmd;
67 extern char *batch_name;
68
69
70 /* there's probably never more than at most 2 outstanding child processes,
71  * but set it higher just in case.
72  */
73 #define MAXCHILDPROCS 5
74
75 struct pid_status {
76         pid_t pid;
77         int   status;
78 } pid_stat_table[MAXCHILDPROCS];
79
80 static void show_malloc_stats(void);
81
82 /****************************************************************************
83 wait for a process to exit, calling io_flush while waiting
84 ****************************************************************************/
85 void wait_process(pid_t pid, int *status)
86 {
87         pid_t waited_pid;
88         int cnt;
89
90         while ((waited_pid = waitpid(pid, status, WNOHANG)) == 0) {
91                 msleep(20);
92                 io_flush(FULL_FLUSH);
93         }
94
95         if (waited_pid == -1 && errno == ECHILD) {
96                 /* status of requested child no longer available.
97                  * check to see if it was processed by the sigchld_handler.
98                  */
99                 for (cnt = 0;  cnt < MAXCHILDPROCS; cnt++) {
100                         if (pid == pid_stat_table[cnt].pid) {
101                                 *status = pid_stat_table[cnt].status;
102                                 pid_stat_table[cnt].pid = 0;
103                                 break;
104                         }
105                 }
106         }
107
108         /* TODO: If the child exited on a signal, then log an
109          * appropriate error message.  Perhaps we should also accept a
110          * message describing the purpose of the child.  Also indicate
111          * this to the caller so that thhey know something went
112          * wrong.  */
113         *status = WEXITSTATUS(*status);
114 }
115
116 /* This function gets called from all 3 processes.  We want the client side
117  * to actually output the text, but the sender is the only process that has
118  * all the stats we need.  So, if we're a client sender, we do the report.
119  * If we're a server sender, we write the stats on the supplied fd.  If
120  * we're the client receiver we read the stats from the supplied fd and do
121  * the report.  All processes might also generate a set of debug stats, if
122  * the verbose level is high enough (this is the only thing that the
123  * generator process and the server receiver ever do here). */
124 static void report(int f)
125 {
126         /* Cache two stats because the read/write code can change it. */
127         int64 total_read = stats.total_read;
128         int64 total_written = stats.total_written;
129         time_t t = time(NULL);
130
131         if (do_stats && verbose > 1) {
132                 /* These come out from every process */
133                 show_malloc_stats();
134                 show_flist_stats();
135         }
136
137         if (am_generator)
138                 return;
139
140         if (am_daemon) {
141                 log_exit(0, __FILE__, __LINE__);
142                 if (f == -1 || !am_sender)
143                         return;
144         }
145
146         if (am_server) {
147                 if (am_sender) {
148                         write_longint(f, total_read);
149                         write_longint(f, total_written);
150                         write_longint(f, stats.total_size);
151                 }
152                 return;
153         }
154
155         /* this is the client */
156
157         if (!am_sender) {
158                 /* Read the first two in opposite order because the meaning of
159                  * read/write swaps when switching from sender to receiver. */
160                 total_written = read_longint(f);
161                 total_read = read_longint(f);
162                 stats.total_size = read_longint(f);
163         } else if (write_batch) {
164                 /* The --read-batch process is going to be a client
165                  * receiver, so we need to give it the stats. */
166                 write_longint(batch_fd, total_read);
167                 write_longint(batch_fd, total_written);
168                 write_longint(batch_fd, stats.total_size);
169         }
170
171         if (do_stats) {
172                 rprintf(FINFO,"\nNumber of files: %d\n", stats.num_files);
173                 rprintf(FINFO,"Number of files transferred: %d\n",
174                         stats.num_transferred_files);
175                 rprintf(FINFO,"Total file size: %.0f bytes\n",
176                         (double)stats.total_size);
177                 rprintf(FINFO,"Total transferred file size: %.0f bytes\n",
178                         (double)stats.total_transferred_size);
179                 rprintf(FINFO,"Literal data: %.0f bytes\n",
180                         (double)stats.literal_data);
181                 rprintf(FINFO,"Matched data: %.0f bytes\n",
182                         (double)stats.matched_data);
183                 rprintf(FINFO,"File list size: %d\n", stats.flist_size);
184                 rprintf(FINFO,"Total bytes sent: %.0f\n",
185                         (double)total_written);
186                 rprintf(FINFO,"Total bytes received: %.0f\n",
187                         (double)total_read);
188         }
189
190         if (verbose || do_stats) {
191                 rprintf(FINFO,
192                         "\nsent %.0f bytes  received %.0f bytes  %.2f bytes/sec\n",
193                         (double)total_written, (double)total_read,
194                         (total_written + total_read)/(0.5 + (t - starttime)));
195                 rprintf(FINFO, "total size is %.0f  speedup is %.2f\n",
196                         (double)stats.total_size,
197                         (double)stats.total_size / (total_written+total_read));
198         }
199
200         fflush(stdout);
201         fflush(stderr);
202 }
203
204
205 /**
206  * If our C library can get malloc statistics, then show them to FINFO
207  **/
208 static void show_malloc_stats(void)
209 {
210 #ifdef HAVE_MALLINFO
211         struct mallinfo mi;
212
213         mi = mallinfo();
214
215         rprintf(FINFO, "\n" RSYNC_NAME "[%d] (%s%s%s) heap statistics:\n",
216                 getpid(),
217                 am_server ? "server " : "",
218                 am_daemon ? "daemon " : "",
219                 who_am_i());
220         rprintf(FINFO, "  arena:     %10d   (bytes from sbrk)\n", mi.arena);
221         rprintf(FINFO, "  ordblks:   %10d   (chunks not in use)\n", mi.ordblks);
222         rprintf(FINFO, "  smblks:    %10d\n", mi.smblks);
223         rprintf(FINFO, "  hblks:     %10d   (chunks from mmap)\n", mi.hblks);
224         rprintf(FINFO, "  hblkhd:    %10d   (bytes from mmap)\n", mi.hblkhd);
225         rprintf(FINFO, "  allmem:    %10d   (bytes from sbrk + mmap)\n",
226             mi.arena + mi.hblkhd);
227         rprintf(FINFO, "  usmblks:   %10d\n", mi.usmblks);
228         rprintf(FINFO, "  fsmblks:   %10d\n", mi.fsmblks);
229         rprintf(FINFO, "  uordblks:  %10d   (bytes used)\n", mi.uordblks);
230         rprintf(FINFO, "  fordblks:  %10d   (bytes free)\n", mi.fordblks);
231         rprintf(FINFO, "  keepcost:  %10d   (bytes in releasable chunk)\n", mi.keepcost);
232 #endif /* HAVE_MALLINFO */
233 }
234
235
236 /* Start the remote shell.   cmd may be NULL to use the default. */
237 static pid_t do_cmd(char *cmd, char *machine, char *user, char *path,
238                     int *f_in, int *f_out)
239 {
240         int i, argc = 0;
241         char *args[MAX_ARGS];
242         pid_t ret;
243         char *tok, *dir = NULL;
244         int dash_l_set = 0;
245
246         if (!read_batch && !local_server) {
247                 char *rsh_env = getenv(RSYNC_RSH_ENV);
248                 if (!cmd)
249                         cmd = rsh_env;
250                 if (!cmd)
251                         cmd = RSYNC_RSH;
252                 cmd = strdup(cmd);
253                 if (!cmd)
254                         goto oom;
255
256                 for (tok = strtok(cmd, " "); tok; tok = strtok(NULL, " ")) {
257                         /* Comparison leaves rooms for server_options(). */
258                         if (argc >= MAX_ARGS - 100) {
259                                 rprintf(FERROR, "internal: args[] overflowed in do_cmd()\n");
260                                 exit_cleanup(RERR_SYNTAX);
261                         }
262                         args[argc++] = tok;
263                 }
264
265                 /* check to see if we've already been given '-l user' in
266                  * the remote-shell command */
267                 for (i = 0; i < argc-1; i++) {
268                         if (!strcmp(args[i], "-l") && args[i+1][0] != '-')
269                                 dash_l_set = 1;
270                 }
271
272 #if HAVE_REMSH
273                 /* remsh (on HPUX) takes the arguments the other way around */
274                 args[argc++] = machine;
275                 if (user && !(daemon_over_rsh && dash_l_set)) {
276                         args[argc++] = "-l";
277                         args[argc++] = user;
278                 }
279 #else
280                 if (user && !(daemon_over_rsh && dash_l_set)) {
281                         args[argc++] = "-l";
282                         args[argc++] = user;
283                 }
284                 args[argc++] = machine;
285 #endif
286
287                 args[argc++] = rsync_path;
288
289                 if (blocking_io < 0) {
290                         char *cp;
291                         if ((cp = strrchr(cmd, '/')) != NULL)
292                                 cp++;
293                         else
294                                 cp = cmd;
295                         if (strcmp(cp, "rsh") == 0 || strcmp(cp, "remsh") == 0)
296                                 blocking_io = 1;
297                 }
298
299                 server_options(args,&argc);
300
301                 if (argc >= MAX_ARGS - 2) {
302                         rprintf(FERROR, "internal: args[] overflowed in do_cmd()\n");
303                         exit_cleanup(RERR_SYNTAX);
304                 }
305         }
306
307         args[argc++] = ".";
308
309         if (!daemon_over_rsh && path && *path)
310                 args[argc++] = path;
311
312         args[argc] = NULL;
313
314         if (verbose > 3) {
315                 rprintf(FINFO,"cmd=");
316                 for (i = 0; i < argc; i++)
317                         rprintf(FINFO,"%s ",args[i]);
318                 rprintf(FINFO,"\n");
319         }
320
321         if (read_batch) {
322                 int from_gen_pipe[2];
323                 if (fd_pair(from_gen_pipe) < 0) {
324                         rsyserr(FERROR, errno, "pipe");
325                         exit_cleanup(RERR_IPC);
326                 }
327                 batch_gen_fd = from_gen_pipe[0];
328                 *f_out = from_gen_pipe[1];
329                 *f_in = batch_fd;
330                 ret = -1; /* no child pid */
331         } else if (local_server) {
332                 /* If the user didn't request --[no-]whole-file, force
333                  * it on, but only if we're not batch processing. */
334                 if (whole_file < 0 && !write_batch)
335                         whole_file = 1;
336                 ret = local_child(argc, args, f_in, f_out, child_main);
337         } else
338                 ret = piped_child(args,f_in,f_out);
339
340         if (dir)
341                 free(dir);
342
343         return ret;
344
345 oom:
346         out_of_memory("do_cmd");
347         return 0; /* not reached */
348 }
349
350
351 static char *get_local_name(struct file_list *flist,char *name)
352 {
353         STRUCT_STAT st;
354         int e;
355
356         if (verbose > 2)
357                 rprintf(FINFO,"get_local_name count=%d %s\n",
358                         flist->count, NS(name));
359
360         if (!name)
361                 return NULL;
362
363         if (do_stat(name,&st) == 0) {
364                 if (S_ISDIR(st.st_mode)) {
365                         if (!push_dir(name)) {
366                                 rsyserr(FERROR, errno, "push_dir#1 %s failed",
367                                         full_fname(name));
368                                 exit_cleanup(RERR_FILESELECT);
369                         }
370                         return NULL;
371                 }
372                 if (flist->count > 1) {
373                         rprintf(FERROR,"ERROR: destination must be a directory when copying more than 1 file\n");
374                         exit_cleanup(RERR_FILESELECT);
375                 }
376                 return name;
377         }
378
379         if (flist->count <= 1 && ((e = strlen(name)) <= 1 || name[e-1] != '/'))
380                 return name;
381
382         if (do_mkdir(name,0777 & ~orig_umask) != 0) {
383                 rsyserr(FERROR, errno, "mkdir %s failed", full_fname(name));
384                 exit_cleanup(RERR_FILEIO);
385         }
386         if (verbose > 0)
387                 rprintf(FINFO, "created directory %s\n", name);
388
389         if (dry_run) {
390                 dry_run++;
391                 return NULL;
392         }
393
394         if (!push_dir(name)) {
395                 rsyserr(FERROR, errno, "push_dir#2 %s failed",
396                         full_fname(name));
397                 exit_cleanup(RERR_FILESELECT);
398         }
399
400         return NULL;
401 }
402
403
404 static void do_server_sender(int f_in, int f_out, int argc,char *argv[])
405 {
406         int i;
407         struct file_list *flist;
408         char *dir = argv[0];
409
410         if (verbose > 2) {
411                 rprintf(FINFO, "server_sender starting pid=%ld\n",
412                         (long)getpid());
413         }
414
415         if (am_daemon && lp_write_only(module_id)) {
416                 rprintf(FERROR, "ERROR: module is write only\n");
417                 exit_cleanup(RERR_SYNTAX);
418                 return;
419         }
420
421         if (!relative_paths && !push_dir(dir)) {
422                 rsyserr(FERROR, errno, "push_dir#3 %s failed",
423                         full_fname(dir));
424                 exit_cleanup(RERR_FILESELECT);
425         }
426         argc--;
427         argv++;
428
429         if (strcmp(dir,".")) {
430                 int l = strlen(dir);
431                 if (strcmp(dir,"/") == 0)
432                         l = 0;
433                 for (i = 0; i < argc; i++)
434                         argv[i] += l+1;
435         }
436
437         if (argc == 0 && (recurse || list_only)) {
438                 argc = 1;
439                 argv--;
440                 argv[0] = ".";
441         }
442
443         flist = send_file_list(f_out,argc,argv);
444         if (!flist || flist->count == 0) {
445                 exit_cleanup(0);
446         }
447
448         io_start_buffering_in();
449         io_start_buffering_out();
450
451         send_files(flist,f_out,f_in);
452         io_flush(FULL_FLUSH);
453         report(f_out);
454         if (protocol_version >= 24) {
455                 /* final goodbye message */
456                 read_int(f_in);
457         }
458         io_flush(FULL_FLUSH);
459         exit_cleanup(0);
460 }
461
462
463 static int do_recv(int f_in,int f_out,struct file_list *flist,char *local_name)
464 {
465         int pid;
466         int status = 0;
467         int error_pipe[2], name_pipe[2];
468         BOOL need_name_pipe = (basis_dir[0] || partial_dir) && !dry_run;
469
470         /* The receiving side mustn't obey this, or an existing symlink that
471          * points to an identical file won't be replaced by the referent. */
472         copy_links = 0;
473
474         if (preserve_hard_links)
475                 init_hard_links(flist);
476
477         if (delete_before) {
478                 /* I moved this here from recv_files() to prevent a race condition */
479                 if (recurse && !local_name && flist->count > 0)
480                         delete_files(flist);
481         }
482
483         if (fd_pair(error_pipe) < 0
484             || (need_name_pipe && fd_pair(name_pipe) < 0)) {
485                 rsyserr(FERROR, errno, "pipe failed in do_recv");
486                 exit_cleanup(RERR_IPC);
487         }
488
489         io_flush(NORMAL_FLUSH);
490
491         if ((pid = do_fork()) == -1) {
492                 rsyserr(FERROR, errno, "fork failed in do_recv");
493                 exit_cleanup(RERR_IPC);
494         }
495
496         if (pid == 0) {
497                 close(error_pipe[0]);
498                 if (need_name_pipe) {
499                         close(name_pipe[1]);
500                         set_blocking(name_pipe[0]);
501                 } else
502                         name_pipe[0] = -1;
503                 if (f_in != f_out)
504                         close(f_out);
505
506                 /* we can't let two processes write to the socket at one time */
507                 close_multiplexing_out();
508
509                 /* set place to send errors */
510                 set_msg_fd_out(error_pipe[1]);
511
512                 recv_files(f_in, flist, local_name, name_pipe[0]);
513                 io_flush(FULL_FLUSH);
514                 report(f_in);
515
516                 send_msg(MSG_DONE, "", 0);
517                 io_flush(FULL_FLUSH);
518                 /* finally we go to sleep until our parent kills us
519                  * with a USR2 signal. We sleep for a short time as on
520                  * some OSes a signal won't interrupt a sleep! */
521                 while (1)
522                         msleep(20);
523         }
524
525         am_generator = 1;
526         close_multiplexing_in();
527         if (write_batch)
528                 stop_write_batch();
529
530         close(error_pipe[1]);
531         if (need_name_pipe) {
532                 close(name_pipe[0]);
533                 set_nonblocking(name_pipe[1]);
534         } else
535                 name_pipe[1] = -1;
536         if (f_in != f_out)
537                 close(f_in);
538
539         io_start_buffering_out();
540
541         set_msg_fd_in(error_pipe[0]);
542
543         generate_files(f_out, flist, local_name, name_pipe[1]);
544
545         report(-1);
546         io_flush(FULL_FLUSH);
547         if (protocol_version >= 24) {
548                 /* send a final goodbye message */
549                 write_int(f_out, -1);
550         }
551         io_flush(FULL_FLUSH);
552
553         set_msg_fd_in(-1);
554         kill(pid, SIGUSR2);
555         wait_process(pid, &status);
556         return status;
557 }
558
559
560 static void do_server_recv(int f_in, int f_out, int argc,char *argv[])
561 {
562         int status;
563         struct file_list *flist;
564         char *local_name = NULL;
565         char *dir = NULL;
566         int save_verbose = verbose;
567
568         if (filesfrom_fd >= 0) {
569                 /* We can't mix messages with files-from data on the socket,
570                  * so temporarily turn off verbose messages. */
571                 verbose = 0;
572         }
573
574         if (verbose > 2) {
575                 rprintf(FINFO, "server_recv(%d) starting pid=%ld\n",
576                         argc, (long)getpid());
577         }
578
579         if (am_daemon && lp_read_only(module_id)) {
580                 rprintf(FERROR,"ERROR: module is read only\n");
581                 exit_cleanup(RERR_SYNTAX);
582                 return;
583         }
584
585
586         if (argc > 0) {
587                 dir = argv[0];
588                 argc--;
589                 argv++;
590                 if (!am_daemon && !push_dir(dir)) {
591                         rsyserr(FERROR, errno, "push_dir#4 %s failed",
592                                 full_fname(dir));
593                         exit_cleanup(RERR_FILESELECT);
594                 }
595         }
596
597         io_start_buffering_in();
598         if (delete_mode && !delete_excluded)
599                 recv_exclude_list(f_in);
600
601         if (filesfrom_fd >= 0) {
602                 /* We need to send the files-from names to the sender at the
603                  * same time that we receive the file-list from them, so we
604                  * need the IO routines to automatically write out the names
605                  * onto our f_out socket as we read the file-list.  This
606                  * avoids both deadlock and extra delays/buffers. */
607                 io_set_filesfrom_fds(filesfrom_fd, f_out);
608                 filesfrom_fd = -1;
609         }
610
611         flist = recv_file_list(f_in);
612         verbose = save_verbose;
613         if (!flist) {
614                 rprintf(FERROR,"server_recv: recv_file_list error\n");
615                 exit_cleanup(RERR_FILESELECT);
616         }
617
618         if (argc > 0) {
619                 if (strcmp(dir,".")) {
620                         argv[0] += strlen(dir);
621                         if (argv[0][0] == '/')
622                                 argv[0]++;
623                 }
624                 local_name = get_local_name(flist,argv[0]);
625         }
626
627         status = do_recv(f_in,f_out,flist,local_name);
628         exit_cleanup(status);
629 }
630
631
632 int child_main(int argc, char *argv[])
633 {
634         start_server(STDIN_FILENO, STDOUT_FILENO, argc, argv);
635         return 0;
636 }
637
638
639 void start_server(int f_in, int f_out, int argc, char *argv[])
640 {
641         set_nonblocking(f_in);
642         set_nonblocking(f_out);
643
644         io_set_sock_fds(f_in, f_out);
645         setup_protocol(f_out, f_in);
646
647         if (protocol_version >= 23)
648                 io_start_multiplex_out();
649
650         if (am_sender) {
651                 keep_dirlinks = 0; /* Must be disabled on the sender. */
652
653                 recv_exclude_list(f_in);
654                 if (cvs_exclude)
655                         add_cvs_excludes();
656                 do_server_sender(f_in, f_out, argc, argv);
657         } else {
658                 do_server_recv(f_in, f_out, argc, argv);
659         }
660         exit_cleanup(0);
661 }
662
663
664 /*
665  * This is called once the connection has been negotiated.  It is used
666  * for rsyncd, remote-shell, and local connections.
667  */
668 int client_run(int f_in, int f_out, pid_t pid, int argc, char *argv[])
669 {
670         struct file_list *flist = NULL;
671         int status = 0, status2 = 0;
672         char *local_name = NULL;
673
674         cleanup_child_pid = pid;
675         if (!read_batch) {
676                 set_nonblocking(f_in);
677                 set_nonblocking(f_out);
678         }
679
680         io_set_sock_fds(f_in, f_out);
681         setup_protocol(f_out,f_in);
682
683         if (protocol_version >= 23 && !read_batch)
684                 io_start_multiplex_in();
685
686         /* We set our stderr file handle to blocking because ssh might have
687          * set it to non-blocking.  This can be particularly troublesome if
688          * stderr is a clone of stdout, because ssh would have set our stdout
689          * to non-blocking at the same time (which can easily cause us to lose
690          * output from our print statements).  This kluge shouldn't cause ssh
691          * any problems for how we use it.  Note also that we delayed setting
692          * this until after the above protocol setup so that we know for sure
693          * that ssh is done twiddling its file descriptors.  */
694         set_blocking(STDERR_FILENO);
695
696         if (am_sender) {
697                 keep_dirlinks = 0; /* Must be disabled on the sender. */
698                 io_start_buffering_out();
699                 if (!remote_filesfrom_file)
700                         set_msg_fd_in(f_in);
701                 if (cvs_exclude)
702                         add_cvs_excludes();
703                 if (delete_mode && !delete_excluded)
704                         send_exclude_list(f_out);
705                 if (remote_filesfrom_file)
706                         filesfrom_fd = f_in;
707
708                 if (write_batch)
709                         start_write_batch(f_out);
710                 if (!read_batch) /* don't write to pipe */
711                         flist = send_file_list(f_out,argc,argv);
712                 set_msg_fd_in(-1);
713                 if (verbose > 3)
714                         rprintf(FINFO,"file list sent\n");
715
716                 io_flush(NORMAL_FLUSH);
717                 send_files(flist,f_out,f_in);
718                 io_flush(FULL_FLUSH);
719                 if (protocol_version >= 24) {
720                         /* final goodbye message */
721                         read_int(f_in);
722                 }
723                 if (pid != -1) {
724                         if (verbose > 3)
725                                 rprintf(FINFO,"client_run waiting on %d\n", (int) pid);
726                         io_flush(FULL_FLUSH);
727                         wait_process(pid, &status);
728                 }
729                 report(-1);
730                 io_flush(FULL_FLUSH);
731                 exit_cleanup(status);
732         }
733
734         if (argc == 0)
735                 list_only |= 1;
736
737         if (!read_batch)
738                 send_exclude_list(f_out);
739
740         if (filesfrom_fd >= 0) {
741                 io_set_filesfrom_fds(filesfrom_fd, f_out);
742                 filesfrom_fd = -1;
743         }
744
745         if (write_batch)
746                 start_write_batch(f_in);
747         flist = recv_file_list(f_in);
748         if (!flist || flist->count == 0) {
749                 rprintf(FINFO, "client: nothing to do: "
750                         "perhaps you need to specify some filenames or "
751                         "the --recursive option?\n");
752                 exit_cleanup(0);
753         }
754
755         local_name = get_local_name(flist,argv[0]);
756
757         status2 = do_recv(f_in,f_out,flist,local_name);
758
759         if (pid != -1) {
760                 if (verbose > 3)
761                         rprintf(FINFO,"client_run2 waiting on %d\n", (int) pid);
762                 io_flush(FULL_FLUSH);
763                 wait_process(pid, &status);
764         }
765
766         return MAX(status, status2);
767 }
768
769 static int copy_argv (char *argv[])
770 {
771         int i;
772
773         for (i = 0; argv[i]; i++) {
774                 if (!(argv[i] = strdup(argv[i]))) {
775                         rprintf (FERROR, "out of memory at %s(%d)\n",
776                                  __FILE__, __LINE__);
777                         return RERR_MALLOC;
778                 }
779         }
780
781         return 0;
782 }
783
784
785 /**
786  * Start a client for either type of remote connection.  Work out
787  * whether the arguments request a remote shell or rsyncd connection,
788  * and call the appropriate connection function, then run_client.
789  *
790  * Calls either start_socket_client (for sockets) or do_cmd and
791  * client_run (for ssh).
792  **/
793 static int start_client(int argc, char *argv[])
794 {
795         char *p;
796         char *shell_machine = NULL;
797         char *shell_path = NULL;
798         char *shell_user = NULL;
799         int ret;
800         pid_t pid;
801         int f_in,f_out;
802         int rc;
803
804         /* Don't clobber argv[] so that ps(1) can still show the right
805          * command line. */
806         if ((rc = copy_argv(argv)))
807                 return rc;
808
809         /* rsync:// always uses rsync server over direct socket connection */
810         if (strncasecmp(URL_PREFIX, argv[0], strlen(URL_PREFIX)) == 0
811             && !read_batch) {
812                 char *host, *path;
813
814                 host = argv[0] + strlen(URL_PREFIX);
815                 p = strchr(host,'/');
816                 if (p) {
817                         *p = '\0';
818                         path = p+1;
819                 } else
820                         path = "";
821                 if (*host == '[' && (p = strchr(host, ']')) != NULL) {
822                         host++;
823                         *p++ = '\0';
824                         if (*p != ':')
825                                 p = NULL;
826                 } else
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+1);
833         }
834
835         if (!read_batch) { /* for read_batch, NO source is specified */
836                 p = find_colon(argv[0]);
837                 if (p) { /* source is remote */
838                         if (remote_filesfrom_file
839                          && remote_filesfrom_file != files_from + 1
840                          && strncmp(files_from, argv[0], p-argv[0]+1) != 0) {
841                                 rprintf(FERROR,
842                                         "--files-from hostname is not the same as the transfer hostname\n");
843                                 exit_cleanup(RERR_SYNTAX);
844                         }
845                         if (p[1] == ':') { /* double colon */
846                                 *p = 0;
847                                 if (!shell_cmd) {
848                                         return start_socket_client(argv[0], p+2,
849                                                                    argc-1, argv+1);
850                                 }
851                                 p++;
852                                 daemon_over_rsh = 1;
853                         }
854
855                         if (argc < 1) { /* destination required */
856                                 usage(FERROR);
857                                 exit_cleanup(RERR_SYNTAX);
858                         }
859
860                         am_sender = 0;
861                         *p = 0;
862                         shell_machine = argv[0];
863                         shell_path = p+1;
864                         argv++;
865                 } else { /* source is local */
866                         am_sender = 1;
867
868                         /* rsync:// destination uses rsync server over direct socket */
869                         if (strncasecmp(URL_PREFIX, argv[argc-1], strlen(URL_PREFIX)) == 0) {
870                                 char *host, *path;
871
872                                 host = argv[argc-1] + strlen(URL_PREFIX);
873                                 p = strchr(host,'/');
874                                 if (p) {
875                                         *p = '\0';
876                                         path = p+1;
877                                 } else
878                                         path = "";
879                                 if (*host == '[' && (p = strchr(host, ']')) != NULL) {
880                                         host++;
881                                         *p++ = '\0';
882                                         if (*p != ':')
883                                                 p = NULL;
884                                 } else
885                                         p = strchr(host, ':');
886                                 if (p) {
887                                         rsync_port = atoi(p+1);
888                                         *p = '\0';
889                                 }
890                                 return start_socket_client(host, path, argc-1, argv);
891                         }
892
893                         p = find_colon(argv[argc-1]); /* look in dest arg */
894                         if (p && remote_filesfrom_file
895                          && remote_filesfrom_file != files_from + 1
896                          && strncmp(files_from, argv[argc-1], p-argv[argc-1]+1) != 0) {
897                                 rprintf(FERROR,
898                                         "--files-from hostname is not the same as the transfer hostname\n");
899                                 exit_cleanup(RERR_SYNTAX);
900                         }
901                         if (!p) { /* no colon found, so src & dest are local */
902                                 local_server = 1;
903                                 if (remote_filesfrom_file) {
904                                         rprintf(FERROR,
905                                                 "--files-from cannot be remote when the transfer is local\n");
906                                         exit_cleanup(RERR_SYNTAX);
907                                 }
908                         } else if (p[1] == ':') { /* double colon */
909                                 *p = 0;
910                                 if (!shell_cmd) {
911                                         return start_socket_client(argv[argc-1], p+2,
912                                                                    argc-1, argv);
913                                 }
914                                 p++;
915                                 daemon_over_rsh = 1;
916                         }
917
918                         if (argc < 2) {
919                                 usage(FERROR);
920                                 exit_cleanup(RERR_SYNTAX);
921                         }
922
923                         if (local_server) {
924                                 shell_machine = NULL;
925                                 shell_path = argv[argc-1];
926                         } else {
927                                 *p = 0;
928                                 shell_machine = argv[argc-1];
929                                 shell_path = p+1;
930                         }
931                 }
932                 argc--;
933         } else {  /* read_batch */
934                 local_server = 1;
935                 shell_path = argv[argc-1];
936                 if (find_colon(shell_path)) {
937                         rprintf(FERROR, "remote destination is not allowed with --read-batch\n");
938                         exit_cleanup(RERR_SYNTAX);
939                 }
940         }
941
942         if (shell_machine) {
943                 p = strrchr(shell_machine,'@');
944                 if (p) {
945                         *p = 0;
946                         shell_user = shell_machine;
947                         shell_machine = p+1;
948                 }
949         }
950
951         if (verbose > 3) {
952                 rprintf(FINFO,"cmd=%s machine=%s user=%s path=%s\n",
953                         shell_cmd?shell_cmd:"",
954                         shell_machine?shell_machine:"",
955                         shell_user?shell_user:"",
956                         shell_path?shell_path:"");
957         }
958
959         /* for remote source, only single dest arg can remain ... */
960         if (!am_sender && argc > 1) {
961                 usage(FERROR);
962                 exit_cleanup(RERR_SYNTAX);
963         }
964
965         /* ... or no dest at all */
966         if (!am_sender && argc == 0)
967                 list_only |= 1;
968
969         pid = do_cmd(shell_cmd,shell_machine,shell_user,shell_path,
970                      &f_in,&f_out);
971
972         /* if we're running an rsync server on the remote host over a
973          * remote shell command, we need to do the RSYNCD protocol first */
974         if (daemon_over_rsh) {
975                 int tmpret;
976                 tmpret = start_inband_exchange(shell_user, shell_path,
977                                                f_in, f_out, argc);
978                 if (tmpret < 0)
979                         return tmpret;
980         }
981
982         ret = client_run(f_in, f_out, pid, argc, argv);
983
984         fflush(stdout);
985         fflush(stderr);
986
987         return ret;
988 }
989
990
991 static RETSIGTYPE sigusr1_handler(UNUSED(int val))
992 {
993         exit_cleanup(RERR_SIGNAL);
994 }
995
996 static RETSIGTYPE sigusr2_handler(UNUSED(int val))
997 {
998         if (log_got_error) _exit(RERR_PARTIAL);
999         _exit(0);
1000 }
1001
1002 static RETSIGTYPE sigchld_handler(UNUSED(int val))
1003 {
1004 #ifdef WNOHANG
1005         int cnt, status;
1006         pid_t pid;
1007         /* An empty waitpid() loop was put here by Tridge and we could never
1008          * get him to explain why he put it in, so rather than taking it
1009          * out we're instead saving the child exit statuses for later use.
1010          * The waitpid() loop presumably eliminates all possibility of leaving
1011          * zombie children, maybe that's why he did it.
1012          */
1013         while ((pid = waitpid(-1, &status, WNOHANG)) > 0) {
1014                 /* save the child's exit status */
1015                 for (cnt = 0; cnt < MAXCHILDPROCS; cnt++) {
1016                         if (pid_stat_table[cnt].pid == 0) {
1017                                 pid_stat_table[cnt].pid = pid;
1018                                 pid_stat_table[cnt].status = status;
1019                                 break;
1020                         }
1021                 }
1022         }
1023 #endif
1024 }
1025
1026
1027 /**
1028  * This routine catches signals and tries to send them to gdb.
1029  *
1030  * Because it's called from inside a signal handler it ought not to
1031  * use too many library routines.
1032  *
1033  * @todo Perhaps use "screen -X" instead/as well, to help people
1034  * debugging without easy access to X.  Perhaps use an environment
1035  * variable, or just call a script?
1036  *
1037  * @todo The /proc/ magic probably only works on Linux (and
1038  * Solaris?)  Can we be more portable?
1039  **/
1040 #ifdef MAINTAINER_MODE
1041 const char *get_panic_action(void)
1042 {
1043         const char *cmd_fmt = getenv("RSYNC_PANIC_ACTION");
1044
1045         if (cmd_fmt)
1046                 return cmd_fmt;
1047         else
1048                 return "xterm -display :0 -T Panic -n Panic "
1049                         "-e gdb /proc/%d/exe %d";
1050 }
1051
1052
1053 /**
1054  * Handle a fatal signal by launching a debugger, controlled by $RSYNC_PANIC_ACTION.
1055  *
1056  * This signal handler is only installed if we were configured with
1057  * --enable-maintainer-mode.  Perhaps it should always be on and we
1058  * should just look at the environment variable, but I'm a bit leery
1059  * of a signal sending us into a busy loop.
1060  **/
1061 static RETSIGTYPE rsync_panic_handler(UNUSED(int whatsig))
1062 {
1063         char cmd_buf[300];
1064         int ret;
1065
1066         sprintf(cmd_buf, get_panic_action(),
1067                 getpid(), getpid());
1068
1069         /* Unless we failed to execute gdb, we allow the process to
1070          * continue.  I'm not sure if that's right. */
1071         ret = system(cmd_buf);
1072         if (ret)
1073                 _exit(ret);
1074 }
1075 #endif
1076
1077
1078 int main(int argc,char *argv[])
1079 {
1080         int ret;
1081         int orig_argc = argc;
1082         char **orig_argv = argv;
1083
1084         signal(SIGUSR1, sigusr1_handler);
1085         signal(SIGUSR2, sigusr2_handler);
1086         signal(SIGCHLD, sigchld_handler);
1087 #ifdef MAINTAINER_MODE
1088         signal(SIGSEGV, rsync_panic_handler);
1089         signal(SIGFPE, rsync_panic_handler);
1090         signal(SIGABRT, rsync_panic_handler);
1091         signal(SIGBUS, rsync_panic_handler);
1092 #endif /* def MAINTAINER_MODE */
1093
1094         starttime = time(NULL);
1095         am_root = (MY_UID() == 0);
1096
1097         memset(&stats, 0, sizeof(stats));
1098
1099         if (argc < 2) {
1100                 usage(FERROR);
1101                 exit_cleanup(RERR_SYNTAX);
1102         }
1103
1104         /* we set a 0 umask so that correct file permissions can be
1105          * carried across */
1106         orig_umask = (int)umask(0);
1107
1108         if (!parse_arguments(&argc, (const char ***) &argv, 1)) {
1109                 /* FIXME: We ought to call the same error-handling
1110                  * code here, rather than relying on getopt. */
1111                 option_error();
1112                 exit_cleanup(RERR_SYNTAX);
1113         }
1114
1115         signal(SIGINT,SIGNAL_CAST sig_int);
1116         signal(SIGHUP,SIGNAL_CAST sig_int);
1117         signal(SIGTERM,SIGNAL_CAST sig_int);
1118
1119         /* Ignore SIGPIPE; we consistently check error codes and will
1120          * see the EPIPE. */
1121         signal(SIGPIPE, SIG_IGN);
1122
1123         /* Initialize push_dir here because on some old systems getcwd
1124          * (implemented by forking "pwd" and reading its output) doesn't
1125          * work when there are other child processes.  Also, on all systems
1126          * that implement getcwd that way "pwd" can't be found after chroot. */
1127         push_dir(NULL);
1128
1129         init_flist();
1130
1131         if (write_batch || read_batch) {
1132                 if (write_batch)
1133                         write_batch_shell_file(orig_argc, orig_argv, argc);
1134
1135                 if (read_batch && strcmp(batch_name, "-") == 0)
1136                         batch_fd = STDIN_FILENO;
1137                 else {
1138                         batch_fd = do_open(batch_name,
1139                                    write_batch ? O_WRONLY | O_CREAT | O_TRUNC
1140                                    : O_RDONLY, S_IRUSR | S_IWUSR);
1141                 }
1142                 if (batch_fd < 0) {
1143                         rsyserr(FERROR, errno, "Batch file %s open error",
1144                                 batch_name);
1145                         exit_cleanup(RERR_FILEIO);
1146                 }
1147                 if (read_batch)
1148                         read_stream_flags(batch_fd);
1149         }
1150
1151         if (am_daemon && !am_server)
1152                 return daemon_main();
1153
1154         if (argc < 1) {
1155                 usage(FERROR);
1156                 exit_cleanup(RERR_SYNTAX);
1157         }
1158
1159         if (dry_run)
1160                 verbose = MAX(verbose,1);
1161
1162         if (am_server) {
1163                 set_nonblocking(STDIN_FILENO);
1164                 set_nonblocking(STDOUT_FILENO);
1165                 if (am_daemon)
1166                         return start_daemon(STDIN_FILENO, STDOUT_FILENO);
1167                 start_server(STDIN_FILENO, STDOUT_FILENO, argc, argv);
1168         }
1169
1170         ret = start_client(argc, argv);
1171         if (ret == -1)
1172                 exit_cleanup(RERR_STARTCLIENT);
1173         else
1174                 exit_cleanup(ret);
1175
1176         return ret;
1177 }