Reposition the call to setup_iconv() so that it gets called only once
[rsync/rsync.git] / main.c
1 /*
2  * The startup routines, including main(), for rsync.
3  *
4  * Copyright (C) 1996-2001 Andrew Tridgell <tridge@samba.org>
5  * Copyright (C) 1996 Paul Mackerras
6  * Copyright (C) 2001, 2002 Martin Pool <mbp@samba.org>
7  * Copyright (C) 2003-2007 Wayne Davison
8  *
9  * This program is free software; you can redistribute it and/or modify
10  * it under the terms of the GNU General Public License as published by
11  * the Free Software Foundation; either version 3 of the License, or
12  * (at your option) any later version.
13  *
14  * This program is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
17  * GNU General Public License for more details.
18  *
19  * You should have received a copy of the GNU General Public License along
20  * with this program; if not, visit the http://fsf.org website.
21  */
22
23 #include "rsync.h"
24 #include "ifuncs.h"
25 #include "io.h"
26 #if defined CONFIG_LOCALE && defined HAVE_LOCALE_H
27 #include <locale.h>
28 #endif
29
30 extern int verbose;
31 extern int dry_run;
32 extern int list_only;
33 extern int am_root;
34 extern int am_server;
35 extern int am_sender;
36 extern int am_generator;
37 extern int am_daemon;
38 extern int inc_recurse;
39 extern int blocking_io;
40 extern int remove_source_files;
41 extern int need_messages_from_generator;
42 extern int kluge_around_eof;
43 extern int do_stats;
44 extern int log_got_error;
45 extern int module_id;
46 extern int copy_links;
47 extern int copy_dirlinks;
48 extern int keep_dirlinks;
49 extern int preserve_hard_links;
50 extern int protocol_version;
51 extern int file_total;
52 extern int recurse;
53 extern int xfer_dirs;
54 extern int protect_args;
55 extern int relative_paths;
56 extern int sanitize_paths;
57 extern int curr_dir_depth;
58 extern int curr_dir_len;
59 extern int module_id;
60 extern int rsync_port;
61 extern int whole_file;
62 extern int read_batch;
63 extern int write_batch;
64 extern int batch_fd;
65 extern int filesfrom_fd;
66 extern pid_t cleanup_child_pid;
67 extern struct stats stats;
68 extern char *filesfrom_host;
69 extern char *partial_dir;
70 extern char *basis_dir[];
71 extern char *rsync_path;
72 extern char *shell_cmd;
73 extern char *batch_name;
74 extern char *password_file;
75 extern char curr_dir[MAXPATHLEN];
76 extern struct file_list *first_flist;
77 extern struct filter_list_struct server_filter_list;
78 #ifdef ICONV_OPTION
79 extern iconv_t ic_send;
80 #endif
81
82 int local_server = 0;
83 int daemon_over_rsh = 0;
84 mode_t orig_umask = 0;
85 int batch_gen_fd = -1;
86
87 /* There's probably never more than at most 2 outstanding child processes,
88  * but set it higher, just in case. */
89 #define MAXCHILDPROCS 7
90
91 #ifdef HAVE_SIGACTION
92 # ifdef HAVE_SIGPROCMASK
93 #  define SIGACTMASK(n,h) SIGACTION(n,h), sigaddset(&sigmask,(n))
94 # else
95 #  define SIGACTMASK(n,h) SIGACTION(n,h)
96 # endif
97 static struct sigaction sigact;
98 #endif
99
100 struct pid_status {
101         pid_t pid;
102         int status;
103 } pid_stat_table[MAXCHILDPROCS];
104
105 static time_t starttime, endtime;
106 static int64 total_read, total_written;
107
108 static void show_malloc_stats(void);
109
110 /* Works like waitpid(), but if we already harvested the child pid in our
111  * remember_children(), we succeed instead of returning an error. */
112 pid_t wait_process(pid_t pid, int *status_ptr, int flags)
113 {
114         pid_t waited_pid;
115         
116         do {
117                 waited_pid = waitpid(pid, status_ptr, flags);
118         } while (waited_pid == -1 && errno == EINTR);
119
120         if (waited_pid == -1 && errno == ECHILD) {
121                 /* Status of requested child no longer available:  check to
122                  * see if it was processed by remember_children(). */
123                 int cnt;
124                 for (cnt = 0; cnt < MAXCHILDPROCS; cnt++) {
125                         if (pid == pid_stat_table[cnt].pid) {
126                                 *status_ptr = pid_stat_table[cnt].status;
127                                 pid_stat_table[cnt].pid = 0;
128                                 return pid;
129                         }
130                 }
131         }
132
133         return waited_pid;
134 }
135
136 /* Wait for a process to exit, calling io_flush while waiting. */
137 static void wait_process_with_flush(pid_t pid, int *exit_code_ptr)
138 {
139         pid_t waited_pid;
140         int status;
141
142         while ((waited_pid = wait_process(pid, &status, WNOHANG)) == 0) {
143                 msleep(20);
144                 io_flush(FULL_FLUSH);
145         }
146
147         /* TODO: If the child exited on a signal, then log an
148          * appropriate error message.  Perhaps we should also accept a
149          * message describing the purpose of the child.  Also indicate
150          * this to the caller so that they know something went wrong. */
151         if (waited_pid < 0) {
152                 rsyserr(FERROR, errno, "waitpid");
153                 *exit_code_ptr = RERR_WAITCHILD;
154         } else if (!WIFEXITED(status)) {
155 #ifdef WCOREDUMP
156                 if (WCOREDUMP(status))
157                         *exit_code_ptr = RERR_CRASHED;
158                 else
159 #endif
160                 if (WIFSIGNALED(status))
161                         *exit_code_ptr = RERR_TERMINATED;
162                 else
163                         *exit_code_ptr = RERR_WAITCHILD;
164         } else
165                 *exit_code_ptr = WEXITSTATUS(status);
166 }
167
168 /* This function gets called from all 3 processes.  We want the client side
169  * to actually output the text, but the sender is the only process that has
170  * all the stats we need.  So, if we're a client sender, we do the report.
171  * If we're a server sender, we write the stats on the supplied fd.  If
172  * we're the client receiver we read the stats from the supplied fd and do
173  * the report.  All processes might also generate a set of debug stats, if
174  * the verbose level is high enough (this is the only thing that the
175  * generator process and the server receiver ever do here). */
176 static void handle_stats(int f)
177 {
178         endtime = time(NULL);
179
180         /* Cache two stats because the read/write code can change it. */
181         total_read = stats.total_read;
182         total_written = stats.total_written;
183
184         if (do_stats && verbose > 1) {
185                 /* These come out from every process */
186                 show_malloc_stats();
187                 show_flist_stats();
188         }
189
190         if (am_generator)
191                 return;
192
193         if (am_daemon) {
194                 if (f == -1 || !am_sender)
195                         return;
196         }
197
198         if (am_server) {
199                 if (am_sender) {
200                         write_varlong30(f, total_read, 3);
201                         write_varlong30(f, total_written, 3);
202                         write_varlong30(f, stats.total_size, 3);
203                         if (protocol_version >= 29) {
204                                 write_varlong30(f, stats.flist_buildtime, 3);
205                                 write_varlong30(f, stats.flist_xfertime, 3);
206                         }
207                 }
208                 return;
209         }
210
211         /* this is the client */
212
213         if (f < 0 && !am_sender) /* e.g. when we got an empty file list. */
214                 ;
215         else if (!am_sender) {
216                 /* Read the first two in opposite order because the meaning of
217                  * read/write swaps when switching from sender to receiver. */
218                 total_written = read_varlong30(f, 3);
219                 total_read = read_varlong30(f, 3);
220                 stats.total_size = read_varlong30(f, 3);
221                 if (protocol_version >= 29) {
222                         stats.flist_buildtime = read_varlong30(f, 3);
223                         stats.flist_xfertime = read_varlong30(f, 3);
224                 }
225         } else if (write_batch) {
226                 /* The --read-batch process is going to be a client
227                  * receiver, so we need to give it the stats. */
228                 write_varlong30(batch_fd, total_read, 3);
229                 write_varlong30(batch_fd, total_written, 3);
230                 write_varlong30(batch_fd, stats.total_size, 3);
231                 if (protocol_version >= 29) {
232                         write_varlong30(batch_fd, stats.flist_buildtime, 3);
233                         write_varlong30(batch_fd, stats.flist_xfertime, 3);
234                 }
235         }
236 }
237
238 static void output_summary(void)
239 {
240         if (do_stats) {
241                 rprintf(FCLIENT, "\n");
242                 rprintf(FINFO,"Number of files: %d\n", stats.num_files);
243                 rprintf(FINFO,"Number of files transferred: %d\n",
244                         stats.num_transferred_files);
245                 rprintf(FINFO,"Total file size: %s bytes\n",
246                         human_num(stats.total_size));
247                 rprintf(FINFO,"Total transferred file size: %s bytes\n",
248                         human_num(stats.total_transferred_size));
249                 rprintf(FINFO,"Literal data: %s bytes\n",
250                         human_num(stats.literal_data));
251                 rprintf(FINFO,"Matched data: %s bytes\n",
252                         human_num(stats.matched_data));
253                 rprintf(FINFO,"File list size: %s\n",
254                         human_num(stats.flist_size));
255                 if (stats.flist_buildtime) {
256                         rprintf(FINFO,
257                                 "File list generation time: %.3f seconds\n",
258                                 (double)stats.flist_buildtime / 1000);
259                         rprintf(FINFO,
260                                 "File list transfer time: %.3f seconds\n",
261                                 (double)stats.flist_xfertime / 1000);
262                 }
263                 rprintf(FINFO,"Total bytes sent: %s\n",
264                         human_num(total_written));
265                 rprintf(FINFO,"Total bytes received: %s\n",
266                         human_num(total_read));
267         }
268
269         if (verbose || do_stats) {
270                 rprintf(FCLIENT, "\n");
271                 rprintf(FINFO,
272                         "sent %s bytes  received %s bytes  %s bytes/sec\n",
273                         human_num(total_written), human_num(total_read),
274                         human_dnum((total_written + total_read)/(0.5 + (endtime - starttime)), 2));
275                 rprintf(FINFO, "total size is %s  speedup is %.2f\n",
276                         human_num(stats.total_size),
277                         (double)stats.total_size / (total_written+total_read));
278         }
279
280         fflush(stdout);
281         fflush(stderr);
282 }
283
284
285 /**
286  * If our C library can get malloc statistics, then show them to FINFO
287  **/
288 static void show_malloc_stats(void)
289 {
290 #ifdef HAVE_MALLINFO
291         struct mallinfo mi;
292
293         mi = mallinfo();
294
295         rprintf(FCLIENT, "\n");
296         rprintf(FINFO, RSYNC_NAME "[%d] (%s%s%s) heap statistics:\n",
297                 getpid(), am_server ? "server " : "",
298                 am_daemon ? "daemon " : "", who_am_i());
299         rprintf(FINFO, "  arena:     %10ld   (bytes from sbrk)\n",
300                 (long)mi.arena);
301         rprintf(FINFO, "  ordblks:   %10ld   (chunks not in use)\n",
302                 (long)mi.ordblks);
303         rprintf(FINFO, "  smblks:    %10ld\n",
304                 (long)mi.smblks);
305         rprintf(FINFO, "  hblks:     %10ld   (chunks from mmap)\n",
306                 (long)mi.hblks);
307         rprintf(FINFO, "  hblkhd:    %10ld   (bytes from mmap)\n",
308                 (long)mi.hblkhd);
309         rprintf(FINFO, "  allmem:    %10ld   (bytes from sbrk + mmap)\n",
310                 (long)mi.arena + mi.hblkhd);
311         rprintf(FINFO, "  usmblks:   %10ld\n",
312                 (long)mi.usmblks);
313         rprintf(FINFO, "  fsmblks:   %10ld\n",
314                 (long)mi.fsmblks);
315         rprintf(FINFO, "  uordblks:  %10ld   (bytes used)\n",
316                 (long)mi.uordblks);
317         rprintf(FINFO, "  fordblks:  %10ld   (bytes free)\n",
318                 (long)mi.fordblks);
319         rprintf(FINFO, "  keepcost:  %10ld   (bytes in releasable chunk)\n",
320                 (long)mi.keepcost);
321 #endif /* HAVE_MALLINFO */
322 }
323
324
325 /* Start the remote shell.   cmd may be NULL to use the default. */
326 static pid_t do_cmd(char *cmd, char *machine, char *user, char **remote_argv, int remote_argc,
327                     int *f_in_p, int *f_out_p)
328 {
329         int i, argc = 0;
330         char *args[MAX_ARGS];
331         pid_t ret;
332         char *dir = NULL;
333         int dash_l_set = 0;
334
335         if (!read_batch && !local_server) {
336                 char *t, *f, in_quote = '\0';
337                 char *rsh_env = getenv(RSYNC_RSH_ENV);
338                 if (!cmd)
339                         cmd = rsh_env;
340                 if (!cmd)
341                         cmd = RSYNC_RSH;
342                 cmd = strdup(cmd);
343                 if (!cmd)
344                         goto oom;
345
346                 for (t = f = cmd; *f; f++) {
347                         if (*f == ' ')
348                                 continue;
349                         /* Comparison leaves rooms for server_options(). */
350                         if (argc >= MAX_ARGS - MAX_SERVER_ARGS)
351                                 goto arg_overflow;
352                         args[argc++] = t;
353                         while (*f != ' ' || in_quote) {
354                                 if (!*f) {
355                                         if (in_quote) {
356                                                 rprintf(FERROR,
357                                                     "Missing trailing-%c in remote-shell command.\n",
358                                                     in_quote);
359                                                 exit_cleanup(RERR_SYNTAX);
360                                         }
361                                         f--;
362                                         break;
363                                 }
364                                 if (*f == '\'' || *f == '"') {
365                                         if (!in_quote) {
366                                                 in_quote = *f++;
367                                                 continue;
368                                         }
369                                         if (*f == in_quote && *++f != in_quote) {
370                                                 in_quote = '\0';
371                                                 continue;
372                                         }
373                                 }
374                                 *t++ = *f++;
375                         }
376                         *t++ = '\0';
377                 }
378
379                 /* check to see if we've already been given '-l user' in
380                  * the remote-shell command */
381                 for (i = 0; i < argc-1; i++) {
382                         if (!strcmp(args[i], "-l") && args[i+1][0] != '-')
383                                 dash_l_set = 1;
384                 }
385
386 #ifdef HAVE_REMSH
387                 /* remsh (on HPUX) takes the arguments the other way around */
388                 args[argc++] = machine;
389                 if (user && !(daemon_over_rsh && dash_l_set)) {
390                         args[argc++] = "-l";
391                         args[argc++] = user;
392                 }
393 #else
394                 if (user && !(daemon_over_rsh && dash_l_set)) {
395                         args[argc++] = "-l";
396                         args[argc++] = user;
397                 }
398                 args[argc++] = machine;
399 #endif
400
401                 args[argc++] = rsync_path;
402
403                 if (blocking_io < 0) {
404                         char *cp;
405                         if ((cp = strrchr(cmd, '/')) != NULL)
406                                 cp++;
407                         else
408                                 cp = cmd;
409                         if (strcmp(cp, "rsh") == 0 || strcmp(cp, "remsh") == 0)
410                                 blocking_io = 1;
411                 }
412
413                 server_options(args,&argc);
414
415                 if (argc >= MAX_ARGS - 2)
416                         goto arg_overflow;
417         }
418
419         args[argc++] = ".";
420
421         if (!daemon_over_rsh) {
422                 while (remote_argc > 0) {
423                         if (argc >= MAX_ARGS - 1) {
424                           arg_overflow:
425                                 rprintf(FERROR, "internal: args[] overflowed in do_cmd()\n");
426                                 exit_cleanup(RERR_SYNTAX);
427                         }
428                         args[argc++] = *remote_argv++;
429                         remote_argc--;
430                 }
431         }
432
433         args[argc] = NULL;
434
435         if (verbose > 3) {
436                 for (i = 0; i < argc; i++)
437                         rprintf(FCLIENT, "cmd[%d]=%s ", i, args[i]);
438                 rprintf(FCLIENT, "\n");
439         }
440
441         if (read_batch) {
442                 int from_gen_pipe[2];
443                 if (fd_pair(from_gen_pipe) < 0) {
444                         rsyserr(FERROR, errno, "pipe");
445                         exit_cleanup(RERR_IPC);
446                 }
447                 batch_gen_fd = from_gen_pipe[0];
448                 *f_out_p = from_gen_pipe[1];
449                 *f_in_p = batch_fd;
450                 ret = -1; /* no child pid */
451                 setup_iconv();
452         } else if (local_server) {
453                 /* If the user didn't request --[no-]whole-file, force
454                  * it on, but only if we're not batch processing. */
455                 if (whole_file < 0 && !write_batch)
456                         whole_file = 1;
457                 ret = local_child(argc, args, f_in_p, f_out_p, child_main);
458                 setup_iconv();
459         } else {
460                 setup_iconv();
461                 if (protect_args) {
462                         int fd;
463 #ifdef ICONV_OPTION
464                         int convert = ic_send != (iconv_t)-1;
465                         xbuf outbuf, inbuf;
466
467                         if (convert)
468                                 alloc_xbuf(&outbuf, 1024);
469 #endif
470
471                         ret = piped_child(args, f_in_p, f_out_p);
472
473                         for (i = 0; args[i]; i++) {} /* find first NULL */
474                         args[i] = "rsync"; /* set a new arg0 */
475                         if (verbose > 1)
476                                 print_child_argv("protected args:", args + i + 1);
477                         fd = *f_out_p;
478                         do {
479 #ifdef ICONV_OPTION
480                                 if (convert) {
481                                         INIT_XBUF_STRLEN(inbuf, args[i]);
482                                         iconvbufs(ic_send, &inbuf, &outbuf,
483                                                   ICB_EXPAND_OUT | ICB_INCLUDE_BAD | ICB_INCLUDE_INCOMPLETE);
484                                         outbuf.buf[outbuf.len] = '\0';
485                                         write_buf(fd, outbuf.buf, outbuf.len + 1);
486                                         outbuf.len = 0;
487                                 } else
488 #endif
489                                         write_buf(fd, args[i], strlen(args[i]) + 1);
490                         } while (args[++i]);
491                         write_byte(fd, 0);
492 #ifdef ICONV_OPTION
493                         if (convert)
494                                 free(outbuf.buf);
495 #endif
496                 } else
497                         ret = piped_child(args, f_in_p, f_out_p);
498         }
499
500         if (dir)
501                 free(dir);
502
503         return ret;
504
505   oom:
506         out_of_memory("do_cmd");
507         return 0; /* not reached */
508 }
509
510 /* The receiving side operates in one of two modes:
511  *
512  * 1. it receives any number of files into a destination directory,
513  * placing them according to their names in the file-list.
514  *
515  * 2. it receives a single file and saves it using the name in the
516  * destination path instead of its file-list name.  This requires a
517  * "local name" for writing out the destination file.
518  *
519  * So, our task is to figure out what mode/local-name we need.
520  * For mode 1, we change into the destination directory and return NULL.
521  * For mode 2, we change into the directory containing the destination
522  * file (if we aren't already there) and return the local-name. */
523 static char *get_local_name(struct file_list *flist, char *dest_path)
524 {
525         STRUCT_STAT st;
526         int statret;
527         char *cp;
528
529         if (verbose > 2) {
530                 rprintf(FINFO, "get_local_name count=%d %s\n",
531                         file_total, NS(dest_path));
532         }
533
534         if (!dest_path || list_only)
535                 return NULL;
536
537         /* See what currently exists at the destination. */
538         if ((statret = do_stat(dest_path, &st)) == 0) {
539                 /* If the destination is a dir, enter it and use mode 1. */
540                 if (S_ISDIR(st.st_mode)) {
541                         if (!push_dir(dest_path, 0)) {
542                                 rsyserr(FERROR, errno, "push_dir#1 %s failed",
543                                         full_fname(dest_path));
544                                 exit_cleanup(RERR_FILESELECT);
545                         }
546                         return NULL;
547                 }
548                 if (file_total > 1) {
549                         rprintf(FERROR,
550                                 "ERROR: destination must be a directory when"
551                                 " copying more than 1 file\n");
552                         exit_cleanup(RERR_FILESELECT);
553                 }
554                 if (file_total == 1 && S_ISDIR(flist->files[0]->mode)) {
555                         rprintf(FERROR,
556                                 "ERROR: cannot overwrite non-directory"
557                                 " with a directory\n");
558                         exit_cleanup(RERR_FILESELECT);
559                 }
560         } else if (errno != ENOENT) {
561                 /* If we don't know what's at the destination, fail. */
562                 rsyserr(FERROR, errno, "ERROR: cannot stat destination %s",
563                         full_fname(dest_path));
564                 exit_cleanup(RERR_FILESELECT);
565         }
566
567         cp = strrchr(dest_path, '/');
568
569         /* If we need a destination directory because the transfer is not
570          * of a single non-directory or the user has requested one via a
571          * destination path ending in a slash, create one and use mode 1. */
572         if (file_total > 1 || (cp && !cp[1])) {
573                 /* Lop off the final slash (if any). */
574                 if (cp && !cp[1])
575                         *cp = '\0';
576
577                 if (statret == 0) {
578                         rprintf(FERROR,
579                             "ERROR: destination path is not a directory\n");
580                         exit_cleanup(RERR_SYNTAX);
581                 }
582
583                 if (mkdir_defmode(dest_path) != 0) {
584                         rsyserr(FERROR, errno, "mkdir %s failed",
585                                 full_fname(dest_path));
586                         exit_cleanup(RERR_FILEIO);
587                 }
588
589                 if (flist->high >= flist->low
590                  && strcmp(flist->files[flist->low]->basename, ".") == 0)
591                         flist->files[0]->flags |= FLAG_DIR_CREATED;
592
593                 if (verbose)
594                         rprintf(FINFO, "created directory %s\n", dest_path);
595
596                 if (dry_run) {
597                         /* Indicate that dest dir doesn't really exist. */
598                         dry_run++;
599                 }
600
601                 if (!push_dir(dest_path, dry_run > 1)) {
602                         rsyserr(FERROR, errno, "push_dir#2 %s failed",
603                                 full_fname(dest_path));
604                         exit_cleanup(RERR_FILESELECT);
605                 }
606
607                 return NULL;
608         }
609
610         /* Otherwise, we are writing a single file, possibly on top of an
611          * existing non-directory.  Change to the item's parent directory
612          * (if it has a path component), return the basename of the
613          * destination file as the local name, and use mode 2. */
614         if (!cp)
615                 return dest_path;
616
617         if (cp == dest_path)
618                 dest_path = "/";
619
620         *cp = '\0';
621         if (!push_dir(dest_path, 0)) {
622                 rsyserr(FERROR, errno, "push_dir#3 %s failed",
623                         full_fname(dest_path));
624                 exit_cleanup(RERR_FILESELECT);
625         }
626         *cp = '/';
627
628         return cp + 1;
629 }
630
631 /* Call this if the destination dir (which is assumed to be in curr_dir)
632  * does not yet exist and we can't create it due to being in dry-run
633  * mode.  We'll fix dirs that can be relative to the non-existent dir. */
634 static void fix_basis_dirs(void)
635 {
636         char **dir, *new, *slash;
637         int len;
638
639         if (dry_run <= 1)
640                 return;
641
642         slash = strrchr(curr_dir, '/');
643
644         for (dir = basis_dir; *dir; dir++) {
645                 if (**dir == '/')
646                         continue;
647                 len = curr_dir_len + 1 + strlen(*dir) + 1;
648                 if (!(new = new_array(char, len)))
649                         out_of_memory("fix_basis_dirs");
650                 if (slash && strncmp(*dir, "../", 3) == 0) {
651                     /* We want to remove only one leading "../" prefix for
652                      * the directory we couldn't create in dry-run mode:
653                      * this ensures that any other ".." references get
654                      * evaluated the same as they would for a live copy. */
655                     *slash = '\0';
656                     pathjoin(new, len, curr_dir, *dir + 3);
657                     *slash = '/';
658                 } else
659                     pathjoin(new, len, curr_dir, *dir);
660                 *dir = new;
661         }
662 }
663
664 /* This is only called by the sender. */
665 static void read_final_goodbye(int f_in)
666 {
667         int i, iflags, xlen;
668         uchar fnamecmp_type;
669         char xname[MAXPATHLEN];
670
671         if (protocol_version < 29)
672                 i = read_int(f_in);
673         else {
674                 i = read_ndx_and_attrs(f_in, &iflags, &fnamecmp_type,
675                                        xname, &xlen);
676         }
677
678         if (i != NDX_DONE) {
679                 rprintf(FERROR, "Invalid packet at end of run (%d) [%s]\n",
680                         i, who_am_i());
681                 exit_cleanup(RERR_PROTOCOL);
682         }
683 }
684
685 static void do_server_sender(int f_in, int f_out, int argc, char *argv[])
686 {
687         struct file_list *flist;
688         char *dir = argv[0];
689
690         if (verbose > 2) {
691                 rprintf(FINFO, "server_sender starting pid=%ld\n",
692                         (long)getpid());
693         }
694
695         if (am_daemon && lp_write_only(module_id)) {
696                 rprintf(FERROR, "ERROR: module is write only\n");
697                 exit_cleanup(RERR_SYNTAX);
698                 return;
699         }
700         if (am_daemon && lp_read_only(module_id) && remove_source_files) {
701                 rprintf(FERROR,
702                     "ERROR: --remove-%s-files cannot be used with a read-only module\n",
703                     remove_source_files == 1 ? "source" : "sent");
704                 exit_cleanup(RERR_SYNTAX);
705                 return;
706         }
707
708         if (!relative_paths) {
709                 if (!push_dir(dir, 0)) {
710                         rsyserr(FERROR, errno, "push_dir#3 %s failed",
711                                 full_fname(dir));
712                         exit_cleanup(RERR_FILESELECT);
713                 }
714         }
715         argc--;
716         argv++;
717
718         if (argc == 0 && (recurse || list_only)) {
719                 argc = 1;
720                 argv--;
721                 argv[0] = ".";
722         }
723
724         flist = send_file_list(f_out,argc,argv);
725         if (!flist || flist->used == 0)
726                 exit_cleanup(0);
727
728         io_start_buffering_in(f_in);
729
730         send_files(f_in, f_out);
731         io_flush(FULL_FLUSH);
732         handle_stats(f_out);
733         if (protocol_version >= 24)
734                 read_final_goodbye(f_in);
735         io_flush(FULL_FLUSH);
736         exit_cleanup(0);
737 }
738
739
740 static int do_recv(int f_in, int f_out, char *local_name)
741 {
742         int pid;
743         int exit_code = 0;
744         int error_pipe[2];
745
746         /* The receiving side mustn't obey this, or an existing symlink that
747          * points to an identical file won't be replaced by the referent. */
748         copy_links = copy_dirlinks = 0;
749
750 #ifdef SUPPORT_HARD_LINKS
751         if (preserve_hard_links && !inc_recurse)
752                 match_hard_links(first_flist);
753 #endif
754
755         if (fd_pair(error_pipe) < 0) {
756                 rsyserr(FERROR, errno, "pipe failed in do_recv");
757                 exit_cleanup(RERR_IPC);
758         }
759
760         io_flush(NORMAL_FLUSH);
761
762         if ((pid = do_fork()) == -1) {
763                 rsyserr(FERROR, errno, "fork failed in do_recv");
764                 exit_cleanup(RERR_IPC);
765         }
766
767         if (pid == 0) {
768                 close(error_pipe[0]);
769                 if (f_in != f_out)
770                         close(f_out);
771
772                 /* we can't let two processes write to the socket at one time */
773                 io_end_multiplex_out();
774
775                 /* set place to send errors */
776                 set_msg_fd_out(error_pipe[1]);
777                 io_start_buffering_out(error_pipe[1]);
778
779                 recv_files(f_in, local_name);
780                 io_flush(FULL_FLUSH);
781                 handle_stats(f_in);
782
783                 send_msg(MSG_DONE, "", 1, 0);
784                 write_varlong(error_pipe[1], stats.total_read, 3);
785                 io_flush(FULL_FLUSH);
786
787                 /* Handle any keep-alive packets from the post-processing work
788                  * that the generator does. */
789                 if (protocol_version >= 29) {
790                         int iflags, xlen;
791                         uchar fnamecmp_type;
792                         char xname[MAXPATHLEN];
793
794                         kluge_around_eof = -1;
795
796                         /* This should only get stopped via a USR2 signal. */
797                         read_ndx_and_attrs(f_in, &iflags, &fnamecmp_type,
798                                            xname, &xlen);
799
800                         rprintf(FERROR, "Invalid packet at end of run [%s]\n",
801                                 who_am_i());
802                         exit_cleanup(RERR_PROTOCOL);
803                 }
804
805                 /* Finally, we go to sleep until our parent kills us with a
806                  * USR2 signal.  We sleep for a short time, as on some OSes
807                  * a signal won't interrupt a sleep! */
808                 while (1)
809                         msleep(20);
810         }
811
812         am_generator = 1;
813
814         io_end_multiplex_in();
815         if (write_batch && !am_server)
816                 stop_write_batch();
817
818         close(error_pipe[1]);
819         if (f_in != f_out)
820                 close(f_in);
821
822         io_start_buffering_out(f_out);
823
824         set_msg_fd_in(error_pipe[0]);
825         io_start_buffering_in(error_pipe[0]);
826
827 #ifdef SUPPORT_HARD_LINKS
828         if (preserve_hard_links && inc_recurse) {
829                 struct file_list *flist;
830                 for (flist = first_flist; flist; flist = flist->next)
831                         match_hard_links(flist);
832         }
833 #endif
834
835         generate_files(f_out, local_name);
836
837         handle_stats(-1);
838         io_flush(FULL_FLUSH);
839         if (protocol_version >= 24) {
840                 /* send a final goodbye message */
841                 write_ndx(f_out, NDX_DONE);
842         }
843         io_flush(FULL_FLUSH);
844
845         set_msg_fd_in(-1);
846         kill(pid, SIGUSR2);
847         wait_process_with_flush(pid, &exit_code);
848         return exit_code;
849 }
850
851 static void do_server_recv(int f_in, int f_out, int argc, char *argv[])
852 {
853         int exit_code;
854         struct file_list *flist;
855         char *local_name = NULL;
856         char *dir = NULL;
857         int save_verbose = verbose;
858
859         if (filesfrom_fd >= 0) {
860                 /* We can't mix messages with files-from data on the socket,
861                  * so temporarily turn off verbose messages. */
862                 verbose = 0;
863         }
864
865         if (verbose > 2) {
866                 rprintf(FINFO, "server_recv(%d) starting pid=%ld\n",
867                         argc, (long)getpid());
868         }
869
870         if (am_daemon && lp_read_only(module_id)) {
871                 rprintf(FERROR,"ERROR: module is read only\n");
872                 exit_cleanup(RERR_SYNTAX);
873                 return;
874         }
875
876         if (argc > 0) {
877                 dir = argv[0];
878                 argc--;
879                 argv++;
880                 if (!am_daemon && !push_dir(dir, 0)) {
881                         rsyserr(FERROR, errno, "push_dir#4 %s failed",
882                                 full_fname(dir));
883                         exit_cleanup(RERR_FILESELECT);
884                 }
885         }
886
887         if (protocol_version >= 30)
888                 io_start_multiplex_in();
889         else
890                 io_start_buffering_in(f_in);
891         recv_filter_list(f_in);
892
893         if (filesfrom_fd >= 0) {
894                 /* We need to send the files-from names to the sender at the
895                  * same time that we receive the file-list from them, so we
896                  * need the IO routines to automatically write out the names
897                  * onto our f_out socket as we read the file-list.  This
898                  * avoids both deadlock and extra delays/buffers. */
899                 io_set_filesfrom_fds(filesfrom_fd, f_out);
900                 filesfrom_fd = -1;
901         }
902
903         flist = recv_file_list(f_in);
904         if (!flist) {
905                 rprintf(FERROR,"server_recv: recv_file_list error\n");
906                 exit_cleanup(RERR_FILESELECT);
907         }
908         if (inc_recurse && file_total == 1)
909                 recv_additional_file_list(f_in);
910         verbose = save_verbose;
911
912         if (argc > 0)
913                 local_name = get_local_name(flist,argv[0]);
914
915         /* Now that we know what our destination directory turned out to be,
916          * we can sanitize the --link-/copy-/compare-dest args correctly. */
917         if (sanitize_paths) {
918                 char **dir;
919                 for (dir = basis_dir; *dir; dir++) {
920                         *dir = sanitize_path(NULL, *dir, NULL, curr_dir_depth, NULL);
921                 }
922                 if (partial_dir) {
923                         partial_dir = sanitize_path(NULL, partial_dir, NULL, curr_dir_depth, NULL);
924                 }
925         }
926         fix_basis_dirs();
927
928         if (server_filter_list.head) {
929                 char **dir;
930                 struct filter_list_struct *elp = &server_filter_list;
931
932                 for (dir = basis_dir; *dir; dir++) {
933                         if (check_filter(elp, *dir, 1) < 0)
934                                 goto options_rejected;
935                 }
936                 if (partial_dir && *partial_dir == '/'
937                  && check_filter(elp, partial_dir, 1) < 0) {
938                     options_rejected:
939                         rprintf(FERROR,
940                                 "Your options have been rejected by the server.\n");
941                         exit_cleanup(RERR_SYNTAX);
942                 }
943         }
944
945         exit_code = do_recv(f_in, f_out, local_name);
946         exit_cleanup(exit_code);
947 }
948
949
950 int child_main(int argc, char *argv[])
951 {
952         start_server(STDIN_FILENO, STDOUT_FILENO, argc, argv);
953         return 0;
954 }
955
956
957 void start_server(int f_in, int f_out, int argc, char *argv[])
958 {
959         set_nonblocking(f_in);
960         set_nonblocking(f_out);
961
962         io_set_sock_fds(f_in, f_out);
963         setup_protocol(f_out, f_in);
964
965         if (protocol_version >= 23)
966                 io_start_multiplex_out();
967
968         if (am_sender) {
969                 keep_dirlinks = 0; /* Must be disabled on the sender. */
970                 if (need_messages_from_generator)
971                         io_start_multiplex_in();
972                 recv_filter_list(f_in);
973                 do_server_sender(f_in, f_out, argc, argv);
974         } else
975                 do_server_recv(f_in, f_out, argc, argv);
976         exit_cleanup(0);
977 }
978
979
980 /*
981  * This is called once the connection has been negotiated.  It is used
982  * for rsyncd, remote-shell, and local connections.
983  */
984 int client_run(int f_in, int f_out, pid_t pid, int argc, char *argv[])
985 {
986         struct file_list *flist = NULL;
987         int exit_code = 0, exit_code2 = 0;
988         char *local_name = NULL;
989
990         cleanup_child_pid = pid;
991         if (!read_batch) {
992                 set_nonblocking(f_in);
993                 set_nonblocking(f_out);
994         }
995
996         io_set_sock_fds(f_in, f_out);
997         setup_protocol(f_out,f_in);
998
999         /* We set our stderr file handle to blocking because ssh might have
1000          * set it to non-blocking.  This can be particularly troublesome if
1001          * stderr is a clone of stdout, because ssh would have set our stdout
1002          * to non-blocking at the same time (which can easily cause us to lose
1003          * output from our print statements).  This kluge shouldn't cause ssh
1004          * any problems for how we use it.  Note also that we delayed setting
1005          * this until after the above protocol setup so that we know for sure
1006          * that ssh is done twiddling its file descriptors.  */
1007         set_blocking(STDERR_FILENO);
1008
1009         if (am_sender) {
1010                 keep_dirlinks = 0; /* Must be disabled on the sender. */
1011                 if (protocol_version >= 30)
1012                         io_start_multiplex_out();
1013                 else
1014                         io_start_buffering_out(f_out);
1015                 if (!filesfrom_host)
1016                         set_msg_fd_in(f_in);
1017                 send_filter_list(f_out);
1018                 if (filesfrom_host)
1019                         filesfrom_fd = f_in;
1020
1021                 if (write_batch && !am_server)
1022                         start_write_batch(f_out);
1023                 flist = send_file_list(f_out, argc, argv);
1024                 set_msg_fd_in(-1);
1025                 if (verbose > 3)
1026                         rprintf(FINFO,"file list sent\n");
1027
1028                 if (protocol_version >= 23)
1029                         io_start_multiplex_in();
1030
1031                 io_flush(NORMAL_FLUSH);
1032                 send_files(f_in, f_out);
1033                 io_flush(FULL_FLUSH);
1034                 handle_stats(-1);
1035                 if (protocol_version >= 24)
1036                         read_final_goodbye(f_in);
1037                 if (pid != -1) {
1038                         if (verbose > 3)
1039                                 rprintf(FINFO,"client_run waiting on %d\n", (int) pid);
1040                         io_flush(FULL_FLUSH);
1041                         wait_process_with_flush(pid, &exit_code);
1042                 }
1043                 output_summary();
1044                 io_flush(FULL_FLUSH);
1045                 exit_cleanup(exit_code);
1046         }
1047
1048         if (!read_batch) {
1049                 if (protocol_version >= 23)
1050                         io_start_multiplex_in();
1051                 if (need_messages_from_generator)
1052                         io_start_multiplex_out();
1053         }
1054
1055         if (argc == 0) {
1056                 list_only |= 1;
1057                 xfer_dirs |= 1;
1058         }
1059
1060         send_filter_list(read_batch ? -1 : f_out);
1061
1062         if (filesfrom_fd >= 0) {
1063                 io_set_filesfrom_fds(filesfrom_fd, f_out);
1064                 filesfrom_fd = -1;
1065         }
1066
1067         if (write_batch && !am_server)
1068                 start_write_batch(f_in);
1069         flist = recv_file_list(f_in);
1070         if (inc_recurse && file_total == 1)
1071                 recv_additional_file_list(f_in);
1072
1073         if (flist && flist->used > 0) {
1074                 local_name = get_local_name(flist, argv[0]);
1075
1076                 fix_basis_dirs();
1077
1078                 exit_code2 = do_recv(f_in, f_out, local_name);
1079         } else {
1080                 handle_stats(-1);
1081                 output_summary();
1082         }
1083
1084         if (pid != -1) {
1085                 if (verbose > 3)
1086                         rprintf(FINFO,"client_run2 waiting on %d\n", (int) pid);
1087                 io_flush(FULL_FLUSH);
1088                 wait_process_with_flush(pid, &exit_code);
1089         }
1090
1091         return MAX(exit_code, exit_code2);
1092 }
1093
1094 static int copy_argv(char *argv[])
1095 {
1096         int i;
1097
1098         for (i = 0; argv[i]; i++) {
1099                 if (!(argv[i] = strdup(argv[i]))) {
1100                         rprintf (FERROR, "out of memory at %s(%d)\n",
1101                                  __FILE__, __LINE__);
1102                         return RERR_MALLOC;
1103                 }
1104         }
1105
1106         return 0;
1107 }
1108
1109
1110 /**
1111  * Start a client for either type of remote connection.  Work out
1112  * whether the arguments request a remote shell or rsyncd connection,
1113  * and call the appropriate connection function, then run_client.
1114  *
1115  * Calls either start_socket_client (for sockets) or do_cmd and
1116  * client_run (for ssh).
1117  **/
1118 static int start_client(int argc, char *argv[])
1119 {
1120         char *p, *shell_machine = NULL, *shell_user = NULL;
1121         char **remote_argv;
1122         int remote_argc;
1123         int f_in, f_out;
1124         int ret;
1125         pid_t pid;
1126
1127         /* Don't clobber argv[] so that ps(1) can still show the right
1128          * command line. */
1129         if ((ret = copy_argv(argv)) != 0)
1130                 return ret;
1131
1132         if (!read_batch) { /* for read_batch, NO source is specified */
1133                 char *path = check_for_hostspec(argv[0], &shell_machine, &rsync_port);
1134                 if (path) { /* source is remote */
1135                         char *dummy_host;
1136                         int dummy_port = 0;
1137                         *argv = path;
1138                         remote_argv = argv;
1139                         remote_argc = argc;
1140                         argv += argc - 1;
1141                         if (argc == 1 || **argv == ':')
1142                                 argc = 0; /* no dest arg */
1143                         else if (check_for_hostspec(*argv, &dummy_host, &dummy_port)) {
1144                                 rprintf(FERROR,
1145                                         "The source and destination cannot both be remote.\n");
1146                                 exit_cleanup(RERR_SYNTAX);
1147                         } else {
1148                                 remote_argc--; /* don't count dest */
1149                                 argc = 1;
1150                         }
1151                         if (filesfrom_host && *filesfrom_host
1152                             && strcmp(filesfrom_host, shell_machine) != 0) {
1153                                 rprintf(FERROR,
1154                                         "--files-from hostname is not the same as the transfer hostname\n");
1155                                 exit_cleanup(RERR_SYNTAX);
1156                         }
1157                         am_sender = 0;
1158                         if (rsync_port)
1159                                 daemon_over_rsh = shell_cmd ? 1 : -1;
1160                 } else { /* source is local, check dest arg */
1161                         am_sender = 1;
1162
1163                         if (argc > 1) {
1164                                 p = argv[--argc];
1165                                 remote_argv = argv + argc;
1166                         } else {
1167                                 static char *dotarg[1] = { "." };
1168                                 p = dotarg[0];
1169                                 remote_argv = dotarg;
1170                                 list_only |= 1;
1171                                 xfer_dirs |= 1;
1172                         }
1173                         remote_argc = 1;
1174
1175                         path = check_for_hostspec(p, &shell_machine, &rsync_port);
1176                         if (path && filesfrom_host && *filesfrom_host
1177                             && strcmp(filesfrom_host, shell_machine) != 0) {
1178                                 rprintf(FERROR,
1179                                         "--files-from hostname is not the same as the transfer hostname\n");
1180                                 exit_cleanup(RERR_SYNTAX);
1181                         }
1182                         if (!path) { /* no hostspec found, so src & dest are local */
1183                                 local_server = 1;
1184                                 if (filesfrom_host) {
1185                                         rprintf(FERROR,
1186                                                 "--files-from cannot be remote when the transfer is local\n");
1187                                         exit_cleanup(RERR_SYNTAX);
1188                                 }
1189                                 shell_machine = NULL;
1190                         } else { /* hostspec was found, so dest is remote */
1191                                 argv[argc] = path;
1192                                 if (rsync_port)
1193                                         daemon_over_rsh = shell_cmd ? 1 : -1;
1194                         }
1195                 }
1196         } else {  /* read_batch */
1197                 local_server = 1;
1198                 if (check_for_hostspec(argv[argc-1], &shell_machine, &rsync_port)) {
1199                         rprintf(FERROR, "remote destination is not allowed with --read-batch\n");
1200                         exit_cleanup(RERR_SYNTAX);
1201                 }
1202                 remote_argv = argv + argc - 1;
1203                 remote_argc = 1;
1204         }
1205
1206         if (am_sender) {
1207                 char *dummy_host;
1208                 int dummy_port = rsync_port;
1209                 int i;
1210                 /* For local source, extra source args must not have hostspec. */
1211                 for (i = 1; i < argc; i++) {
1212                         if (check_for_hostspec(argv[i], &dummy_host, &dummy_port)) {
1213                                 rprintf(FERROR, "Unexpected remote arg: %s\n", argv[i]);
1214                                 exit_cleanup(RERR_SYNTAX);
1215                         }
1216                 }
1217         } else {
1218                 char *dummy_host;
1219                 int dummy_port = rsync_port;
1220                 int i;
1221                 /* For remote source, any extra source args must have either
1222                  * the same hostname or an empty hostname. */
1223                 for (i = 1; i < remote_argc; i++) {
1224                         char *arg = check_for_hostspec(remote_argv[i], &dummy_host, &dummy_port);
1225                         if (!arg) {
1226                                 rprintf(FERROR, "Unexpected local arg: %s\n", remote_argv[i]);
1227                                 rprintf(FERROR, "If arg is a remote file/dir, prefix it with a colon (:).\n");
1228                                 exit_cleanup(RERR_SYNTAX);
1229                         }
1230                         if (*dummy_host && strcmp(dummy_host, shell_machine) != 0) {
1231                                 rprintf(FERROR, "All source args must come from the same machine.\n");
1232                                 exit_cleanup(RERR_SYNTAX);
1233                         }
1234                         if (rsync_port != dummy_port) {
1235                                 if (!rsync_port || !dummy_port)
1236                                         rprintf(FERROR, "All source args must use the same hostspec format.\n");
1237                                 else
1238                                         rprintf(FERROR, "All source args must use the same port number.\n");
1239                                 exit_cleanup(RERR_SYNTAX);
1240                         }
1241                         remote_argv[i] = arg;
1242                 }
1243                 if (argc == 0) {
1244                         list_only |= 1;
1245                         xfer_dirs |= 1;
1246                 }
1247         }
1248
1249         if (daemon_over_rsh < 0)
1250                 return start_socket_client(shell_machine, remote_argc, remote_argv, argc, argv);
1251
1252         if (password_file && !daemon_over_rsh) {
1253                 rprintf(FERROR, "The --password-file option may only be "
1254                                 "used when accessing an rsync daemon.\n");
1255                 exit_cleanup(RERR_SYNTAX);
1256         }
1257
1258         if (shell_machine) {
1259                 p = strrchr(shell_machine,'@');
1260                 if (p) {
1261                         *p = 0;
1262                         shell_user = shell_machine;
1263                         shell_machine = p+1;
1264                 }
1265         }
1266
1267         if (verbose > 3) {
1268                 rprintf(FINFO,"cmd=%s machine=%s user=%s path=%s\n",
1269                         NS(shell_cmd), NS(shell_machine), NS(shell_user),
1270                         remote_argv ? NS(remote_argv[0]) : "");
1271         }
1272
1273         pid = do_cmd(shell_cmd, shell_machine, shell_user, remote_argv, remote_argc,
1274                      &f_in, &f_out);
1275
1276         /* if we're running an rsync server on the remote host over a
1277          * remote shell command, we need to do the RSYNCD protocol first */
1278         if (daemon_over_rsh) {
1279                 int tmpret;
1280                 tmpret = start_inband_exchange(f_in, f_out, shell_user, remote_argc, remote_argv);
1281                 if (tmpret < 0)
1282                         return tmpret;
1283         }
1284
1285         ret = client_run(f_in, f_out, pid, argc, argv);
1286
1287         fflush(stdout);
1288         fflush(stderr);
1289
1290         return ret;
1291 }
1292
1293
1294 static RETSIGTYPE sigusr1_handler(UNUSED(int val))
1295 {
1296         exit_cleanup(RERR_SIGNAL1);
1297 }
1298
1299 static RETSIGTYPE sigusr2_handler(UNUSED(int val))
1300 {
1301         if (!am_server)
1302                 output_summary();
1303         close_all();
1304         if (log_got_error)
1305                 _exit(RERR_PARTIAL);
1306         _exit(0);
1307 }
1308
1309 RETSIGTYPE remember_children(UNUSED(int val))
1310 {
1311 #ifdef WNOHANG
1312         int cnt, status;
1313         pid_t pid;
1314         /* An empty waitpid() loop was put here by Tridge and we could never
1315          * get him to explain why he put it in, so rather than taking it
1316          * out we're instead saving the child exit statuses for later use.
1317          * The waitpid() loop presumably eliminates all possibility of leaving
1318          * zombie children, maybe that's why he did it. */
1319         while ((pid = waitpid(-1, &status, WNOHANG)) > 0) {
1320                 /* save the child's exit status */
1321                 for (cnt = 0; cnt < MAXCHILDPROCS; cnt++) {
1322                         if (pid_stat_table[cnt].pid == 0) {
1323                                 pid_stat_table[cnt].pid = pid;
1324                                 pid_stat_table[cnt].status = status;
1325                                 break;
1326                         }
1327                 }
1328         }
1329 #endif
1330 #ifndef HAVE_SIGACTION
1331         signal(SIGCHLD, remember_children);
1332 #endif
1333 }
1334
1335
1336 /**
1337  * This routine catches signals and tries to send them to gdb.
1338  *
1339  * Because it's called from inside a signal handler it ought not to
1340  * use too many library routines.
1341  *
1342  * @todo Perhaps use "screen -X" instead/as well, to help people
1343  * debugging without easy access to X.  Perhaps use an environment
1344  * variable, or just call a script?
1345  *
1346  * @todo The /proc/ magic probably only works on Linux (and
1347  * Solaris?)  Can we be more portable?
1348  **/
1349 #ifdef MAINTAINER_MODE
1350 const char *get_panic_action(void)
1351 {
1352         const char *cmd_fmt = getenv("RSYNC_PANIC_ACTION");
1353
1354         if (cmd_fmt)
1355                 return cmd_fmt;
1356         else
1357                 return "xterm -display :0 -T Panic -n Panic "
1358                         "-e gdb /proc/%d/exe %d";
1359 }
1360
1361
1362 /**
1363  * Handle a fatal signal by launching a debugger, controlled by $RSYNC_PANIC_ACTION.
1364  *
1365  * This signal handler is only installed if we were configured with
1366  * --enable-maintainer-mode.  Perhaps it should always be on and we
1367  * should just look at the environment variable, but I'm a bit leery
1368  * of a signal sending us into a busy loop.
1369  **/
1370 static RETSIGTYPE rsync_panic_handler(UNUSED(int whatsig))
1371 {
1372         char cmd_buf[300];
1373         int ret;
1374
1375         snprintf(cmd_buf, sizeof cmd_buf, get_panic_action(),
1376                  getpid(), getpid());
1377
1378         /* Unless we failed to execute gdb, we allow the process to
1379          * continue.  I'm not sure if that's right. */
1380         ret = system(cmd_buf);
1381         if (ret)
1382                 _exit(ret);
1383 }
1384 #endif
1385
1386
1387 int main(int argc,char *argv[])
1388 {
1389         int ret;
1390         int orig_argc = argc;
1391         char **orig_argv = argv;
1392 #ifdef HAVE_SIGACTION
1393 # ifdef HAVE_SIGPROCMASK
1394         sigset_t sigmask;
1395
1396         sigemptyset(&sigmask);
1397 # endif
1398         sigact.sa_flags = SA_NOCLDSTOP;
1399 #endif
1400         SIGACTMASK(SIGUSR1, sigusr1_handler);
1401         SIGACTMASK(SIGUSR2, sigusr2_handler);
1402         SIGACTMASK(SIGCHLD, remember_children);
1403 #ifdef MAINTAINER_MODE
1404         SIGACTMASK(SIGSEGV, rsync_panic_handler);
1405         SIGACTMASK(SIGFPE, rsync_panic_handler);
1406         SIGACTMASK(SIGABRT, rsync_panic_handler);
1407         SIGACTMASK(SIGBUS, rsync_panic_handler);
1408 #endif
1409
1410         starttime = time(NULL);
1411         am_root = (MY_UID() == 0);
1412
1413         memset(&stats, 0, sizeof(stats));
1414
1415         if (argc < 2) {
1416                 usage(FERROR);
1417                 exit_cleanup(RERR_SYNTAX);
1418         }
1419
1420         /* we set a 0 umask so that correct file permissions can be
1421          * carried across */
1422         orig_umask = umask(0);
1423
1424 #if defined CONFIG_LOCALE && defined HAVE_SETLOCALE
1425         setlocale(LC_CTYPE, "");
1426 #endif
1427
1428         if (!parse_arguments(&argc, (const char ***) &argv, 1)) {
1429                 /* FIXME: We ought to call the same error-handling
1430                  * code here, rather than relying on getopt. */
1431                 option_error();
1432                 exit_cleanup(RERR_SYNTAX);
1433         }
1434
1435         SIGACTMASK(SIGINT, sig_int);
1436         SIGACTMASK(SIGHUP, sig_int);
1437         SIGACTMASK(SIGTERM, sig_int);
1438 #if defined HAVE_SIGACTION && HAVE_SIGPROCMASK
1439         sigprocmask(SIG_UNBLOCK, &sigmask, NULL);
1440 #endif
1441
1442         /* Ignore SIGPIPE; we consistently check error codes and will
1443          * see the EPIPE. */
1444         SIGACTION(SIGPIPE, SIG_IGN);
1445 #ifdef SIGXFSZ
1446         SIGACTION(SIGXFSZ, SIG_IGN);
1447 #endif
1448
1449         /* Initialize push_dir here because on some old systems getcwd
1450          * (implemented by forking "pwd" and reading its output) doesn't
1451          * work when there are other child processes.  Also, on all systems
1452          * that implement getcwd that way "pwd" can't be found after chroot. */
1453         push_dir(NULL, 0);
1454
1455         init_flist();
1456
1457         if ((write_batch || read_batch) && !am_server) {
1458                 if (write_batch)
1459                         write_batch_shell_file(orig_argc, orig_argv, argc);
1460
1461                 if (read_batch && strcmp(batch_name, "-") == 0)
1462                         batch_fd = STDIN_FILENO;
1463                 else {
1464                         batch_fd = do_open(batch_name,
1465                                    write_batch ? O_WRONLY | O_CREAT | O_TRUNC
1466                                    : O_RDONLY, S_IRUSR | S_IWUSR);
1467                 }
1468                 if (batch_fd < 0) {
1469                         rsyserr(FERROR, errno, "Batch file %s open error",
1470                                 full_fname(batch_name));
1471                         exit_cleanup(RERR_FILEIO);
1472                 }
1473                 if (read_batch)
1474                         read_stream_flags(batch_fd);
1475                 else
1476                         write_stream_flags(batch_fd);
1477
1478         }
1479         if (write_batch < 0)
1480                 dry_run = 1;
1481
1482         if (am_server)
1483                 setup_iconv();
1484         else if (am_daemon)
1485                 return daemon_main();
1486
1487         if (am_server && protect_args) {
1488                 char buf[MAXPATHLEN];
1489                 protect_args = 2;
1490                 read_args(STDIN_FILENO, NULL, buf, sizeof buf, 1, &argv, &argc, NULL);
1491                 if (!parse_arguments(&argc, (const char ***) &argv, 1)) {
1492                         option_error();
1493                         exit_cleanup(RERR_SYNTAX);
1494                 }
1495         }
1496
1497         if (argc < 1) {
1498                 usage(FERROR);
1499                 exit_cleanup(RERR_SYNTAX);
1500         }
1501
1502         if (am_server) {
1503                 set_nonblocking(STDIN_FILENO);
1504                 set_nonblocking(STDOUT_FILENO);
1505                 if (am_daemon)
1506                         return start_daemon(STDIN_FILENO, STDOUT_FILENO);
1507                 start_server(STDIN_FILENO, STDOUT_FILENO, argc, argv);
1508         }
1509
1510         ret = start_client(argc, argv);
1511         if (ret == -1)
1512                 exit_cleanup(RERR_STARTCLIENT);
1513         else
1514                 exit_cleanup(ret);
1515
1516         return ret;
1517 }