Commit | Line | Data |
---|---|---|
237e0016 RS |
1 | /* movemail foo bar -- move file foo to file bar, |
2 | locking file foo the way /bin/mail respects. | |
95df8112 | 3 | |
acaf905b | 4 | Copyright (C) 1986, 1992-1994, 1996, 1999, 2001-2012 |
95df8112 | 5 | Free Software Foundation, Inc. |
237e0016 RS |
6 | |
7 | This file is part of GNU Emacs. | |
8 | ||
294981c7 | 9 | GNU Emacs is free software: you can redistribute it and/or modify |
93320c23 | 10 | it under the terms of the GNU General Public License as published by |
294981c7 GM |
11 | the Free Software Foundation, either version 3 of the License, or |
12 | (at your option) any later version. | |
93320c23 | 13 | |
237e0016 | 14 | GNU Emacs is distributed in the hope that it will be useful, |
93320c23 JA |
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. | |
237e0016 | 18 | |
93320c23 | 19 | You should have received a copy of the GNU General Public License |
294981c7 GM |
20 | along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */ |
21 | ||
237e0016 | 22 | |
63cf923d RS |
23 | /* Important notice: defining MAIL_USE_FLOCK or MAIL_USE_LOCKF *will |
24 | cause loss of mail* if you do it on a system that does not normally | |
0aa8781f | 25 | use flock/lockf as its way of interlocking access to inbox files. The |
63cf923d RS |
26 | setting of MAIL_USE_FLOCK and MAIL_USE_LOCKF *must agree* with the |
27 | system's own conventions. It is not a choice that is up to you. | |
08d0752f RS |
28 | |
29 | So, if your system uses lock files rather than flock, then the only way | |
30 | you can get proper operation is to enable movemail to write lockfiles there. | |
31 | This means you must either give that directory access modes | |
32 | that permit everyone to write lockfiles in it, or you must make movemail | |
33 | a setuid or setgid program. */ | |
34 | ||
237e0016 RS |
35 | /* |
36 | * Modified January, 1986 by Michael R. Gretzinger (Project Athena) | |
37 | * | |
88c40feb | 38 | * Added POP (Post Office Protocol) service. When compiled -DMAIL_USE_POP |
237e0016 RS |
39 | * movemail will accept input filename arguments of the form |
40 | * "po:username". This will cause movemail to open a connection to | |
41 | * a pop server running on $MAILHOST (environment variable). Movemail | |
42 | * must be setuid to root in order to work with POP. | |
177c0ea7 | 43 | * |
237e0016 RS |
44 | * New module: popmail.c |
45 | * Modified routines: | |
cfa191ff | 46 | * main - added code within #ifdef MAIL_USE_POP; added setuid (getuid ()) |
177c0ea7 | 47 | * after POP code. |
237e0016 RS |
48 | * New routines in movemail.c: |
49 | * get_errmsg - return pointer to system error message | |
50 | * | |
2e82e3c3 RS |
51 | * Modified August, 1993 by Jonathan Kamens (OpenVision Technologies) |
52 | * | |
53 | * Move all of the POP code into a separate file, "pop.c". | |
54 | * Use strerror instead of get_errmsg. | |
55 | * | |
237e0016 RS |
56 | */ |
57 | ||
752fb472 | 58 | #include <config.h> |
237e0016 RS |
59 | #include <sys/types.h> |
60 | #include <sys/stat.h> | |
61 | #include <sys/file.h> | |
e2f9d9af | 62 | #include <stdio.h> |
237e0016 | 63 | #include <errno.h> |
bd41a17d | 64 | #include <time.h> |
cc3b64e8 | 65 | |
fea4325c | 66 | #include <getopt.h> |
f72adc12 | 67 | #include <unistd.h> |
cc3b64e8 DL |
68 | #ifdef HAVE_FCNTL_H |
69 | #include <fcntl.h> | |
70 | #endif | |
1725ae55 | 71 | #include <string.h> |
f72adc12 | 72 | #include "syswait.h" |
2e82e3c3 RS |
73 | #ifdef MAIL_USE_POP |
74 | #include "pop.h" | |
75 | #endif | |
237e0016 | 76 | |
91cf09ac RS |
77 | #ifdef MSDOS |
78 | #undef access | |
79 | #endif /* MSDOS */ | |
80 | ||
7f75d5c6 | 81 | #ifdef WINDOWSNT |
677a7bcf | 82 | #include "ntlib.h" |
7f75d5c6 RS |
83 | #undef access |
84 | #undef unlink | |
85 | #define fork() 0 | |
4822b2e5 | 86 | #define wait(var) (*(var) = 0) |
7f75d5c6 RS |
87 | /* Unfortunately, Samba doesn't seem to properly lock Unix files even |
88 | though the locking call succeeds (and indeed blocks local access from | |
89 | other NT programs). If you have direct file access using an NFS | |
90 | client or something other than Samba, the locking call might work | |
677a7bcf RS |
91 | properly - make sure it does before you enable this! |
92 | ||
93 | [18-Feb-97 andrewi] I now believe my comment above to be incorrect, | |
94 | since it was based on a misunderstanding of how locking calls are | |
95 | implemented and used on Unix. */ | |
96 | //#define DISABLE_DIRECT_ACCESS | |
97 | ||
677a7bcf | 98 | #include <fcntl.h> |
7f75d5c6 RS |
99 | #endif /* WINDOWSNT */ |
100 | ||
4ec9a77a RS |
101 | #ifndef F_OK |
102 | #define F_OK 0 | |
103 | #define X_OK 1 | |
104 | #define W_OK 2 | |
105 | #define R_OK 4 | |
106 | #endif | |
237e0016 | 107 | |
76ed5e01 | 108 | #ifdef WINDOWSNT |
237e0016 RS |
109 | #include <sys/locking.h> |
110 | #endif | |
111 | ||
0aa8781f GM |
112 | /* If your system uses the `flock' or `lockf' system call for mail locking, |
113 | define MAIL_USE_SYSTEM_LOCK. If your system type should always define | |
114 | MAIL_USE_LOCKF or MAIL_USE_FLOCK but configure does not do this, | |
115 | please make a bug report. */ | |
116 | ||
63cf923d RS |
117 | #ifdef MAIL_USE_LOCKF |
118 | #define MAIL_USE_SYSTEM_LOCK | |
119 | #endif | |
120 | ||
121 | #ifdef MAIL_USE_FLOCK | |
122 | #define MAIL_USE_SYSTEM_LOCK | |
123 | #endif | |
124 | ||
4293ba7f RS |
125 | #ifdef MAIL_USE_MMDF |
126 | extern int lk_open (), lk_close (); | |
127 | #endif | |
128 | ||
a4deff3c | 129 | #if !defined (MAIL_USE_SYSTEM_LOCK) && !defined (MAIL_USE_MMDF) && \ |
dd843b6a DL |
130 | (defined (HAVE_LIBMAIL) || defined (HAVE_LIBLOCKFILE)) && \ |
131 | defined (HAVE_MAILLOCK_H) | |
a4deff3c RS |
132 | #include <maillock.h> |
133 | /* We can't use maillock unless we know what directory system mail | |
134 | files appear in. */ | |
135 | #ifdef MAILDIR | |
136 | #define MAIL_USE_MAILLOCK | |
5a9c1e26 | 137 | static char *mail_spool_name (char *); |
a4deff3c RS |
138 | #endif |
139 | #endif | |
140 | ||
845ca893 | 141 | static _Noreturn void fatal (const char *s1, const char *s2, const char *s3); |
988e88ab | 142 | static void error (const char *s1, const char *s2, const char *s3); |
845ca893 PE |
143 | static _Noreturn void pfatal_with_name (char *name); |
144 | static _Noreturn void pfatal_and_delete (char *name); | |
e2ad23ef | 145 | #ifdef MAIL_USE_POP |
1725ae55 AS |
146 | static int popmail (char *mailbox, char *outfile, int preserve, char *password, int reverse_order); |
147 | static int pop_retr (popserver server, int msgno, FILE *arg); | |
148 | static int mbx_write (char *line, int len, FILE *mbf); | |
149 | static int mbx_delimit_begin (FILE *mbf); | |
150 | static int mbx_delimit_end (FILE *mbf); | |
e2ad23ef | 151 | #endif |
237e0016 | 152 | |
debd9b27 | 153 | #if (defined MAIL_USE_MAILLOCK \ |
c214e35e PE |
154 | || (!defined DISABLE_DIRECT_ACCESS && !defined MAIL_USE_MMDF \ |
155 | && !defined MAIL_USE_SYSTEM_LOCK)) | |
156 | /* Like malloc but get fatal error if memory is exhausted. */ | |
157 | ||
158 | static void * | |
159 | xmalloc (size_t size) | |
160 | { | |
161 | void *result = malloc (size); | |
162 | if (!result) | |
163 | fatal ("virtual memory exhausted", 0, 0); | |
164 | return result; | |
165 | } | |
166 | #endif | |
167 | ||
237e0016 | 168 | /* Nonzero means this is name of a lock file to delete on fatal error. */ |
b23b5a5b | 169 | static char *delete_lockname; |
237e0016 | 170 | |
e2f9d9af | 171 | int |
873fbd0b | 172 | main (int argc, char **argv) |
237e0016 RS |
173 | { |
174 | char *inname, *outname; | |
175 | int indesc, outdesc; | |
728a982d | 176 | ssize_t nread; |
27d41fb4 | 177 | int wait_status; |
fea4325c | 178 | int c, preserve_mail = 0; |
237e0016 | 179 | |
63cf923d | 180 | #ifndef MAIL_USE_SYSTEM_LOCK |
237e0016 | 181 | struct stat st; |
237e0016 | 182 | int tem; |
529a133c | 183 | char *lockname; |
906ad89d | 184 | char *tempname; |
c214e35e | 185 | size_t inname_len, inname_dirlen; |
237e0016 | 186 | int desc; |
63cf923d | 187 | #endif /* not MAIL_USE_SYSTEM_LOCK */ |
237e0016 | 188 | |
a4deff3c RS |
189 | #ifdef MAIL_USE_MAILLOCK |
190 | char *spool_name; | |
191 | #endif | |
192 | ||
a2997b0f KH |
193 | #ifdef MAIL_USE_POP |
194 | int pop_reverse_order = 0; | |
195 | # define ARGSTR "pr" | |
196 | #else /* ! MAIL_USE_POP */ | |
197 | # define ARGSTR "p" | |
198 | #endif /* MAIL_USE_POP */ | |
199 | ||
5e617bc2 JB |
200 | uid_t real_gid = getgid (); |
201 | uid_t priv_gid = getegid (); | |
51a91f9d | 202 | |
9112a2a9 AI |
203 | #ifdef WINDOWSNT |
204 | /* Ensure all file i/o is in binary mode. */ | |
205 | _fmode = _O_BINARY; | |
206 | #endif | |
207 | ||
237e0016 RS |
208 | delete_lockname = 0; |
209 | ||
a2997b0f | 210 | while ((c = getopt (argc, argv, ARGSTR)) != EOF) |
e2f9d9af | 211 | { |
fea4325c | 212 | switch (c) { |
a2997b0f KH |
213 | #ifdef MAIL_USE_POP |
214 | case 'r': | |
215 | pop_reverse_order = 1; | |
216 | break; | |
217 | #endif | |
fea4325c RS |
218 | case 'p': |
219 | preserve_mail++; | |
220 | break; | |
221 | default: | |
65396510 | 222 | exit (EXIT_FAILURE); |
fea4325c RS |
223 | } |
224 | } | |
225 | ||
226 | if ( | |
227 | #ifdef MAIL_USE_POP | |
228 | (argc - optind < 2) || (argc - optind > 3) | |
229 | #else | |
230 | (argc - optind != 2) | |
231 | #endif | |
232 | ) | |
233 | { | |
fea4325c | 234 | #ifdef MAIL_USE_POP |
f213f2c0 | 235 | fprintf (stderr, "Usage: movemail [-p] [-r] inbox destfile%s\n", |
bb5618fe | 236 | " [POP-password]"); |
fea4325c | 237 | #else |
bb5618fe | 238 | fprintf (stderr, "Usage: movemail [-p] inbox destfile%s\n", ""); |
fea4325c | 239 | #endif |
65396510 | 240 | exit (EXIT_FAILURE); |
e2f9d9af | 241 | } |
237e0016 | 242 | |
fea4325c RS |
243 | inname = argv[optind]; |
244 | outname = argv[optind+1]; | |
237e0016 | 245 | |
4293ba7f RS |
246 | #ifdef MAIL_USE_MMDF |
247 | mmdf_init (argv[0]); | |
248 | #endif | |
249 | ||
af7bd34e | 250 | if (*outname == 0) |
a9eedf40 | 251 | fatal ("Destination file name is empty", 0, 0); |
af7bd34e | 252 | |
237e0016 | 253 | #ifdef MAIL_USE_POP |
12a0565a | 254 | if (!strncmp (inname, "po:", 3)) |
237e0016 | 255 | { |
b3112191 | 256 | int status; |
237e0016 | 257 | |
fea4325c | 258 | status = popmail (inname + 3, outname, preserve_mail, |
a2997b0f KH |
259 | (argc - optind == 3) ? argv[optind+2] : NULL, |
260 | pop_reverse_order); | |
237e0016 RS |
261 | exit (status); |
262 | } | |
263 | ||
51a91f9d CY |
264 | if (setuid (getuid ()) < 0) |
265 | fatal ("Failed to drop privileges", 0, 0); | |
266 | ||
237e0016 RS |
267 | #endif /* MAIL_USE_POP */ |
268 | ||
7f75d5c6 | 269 | #ifndef DISABLE_DIRECT_ACCESS |
4293ba7f | 270 | #ifndef MAIL_USE_MMDF |
63cf923d | 271 | #ifndef MAIL_USE_SYSTEM_LOCK |
a4deff3c RS |
272 | #ifdef MAIL_USE_MAILLOCK |
273 | spool_name = mail_spool_name (inname); | |
5a9c1e26 PE |
274 | if (spool_name) |
275 | { | |
276 | #ifdef lint | |
277 | lockname = 0; | |
278 | #endif | |
279 | } | |
280 | else | |
a4deff3c | 281 | #endif |
237e0016 | 282 | { |
a4deff3c RS |
283 | /* Use a lock file named after our first argument with .lock appended: |
284 | If it exists, the mail file is locked. */ | |
285 | /* Note: this locking mechanism is *required* by the mailer | |
286 | (on systems which use it) to prevent loss of mail. | |
287 | ||
288 | On systems that use a lock file, extracting the mail without locking | |
289 | WILL occasionally cause loss of mail due to timing errors! | |
290 | ||
7eaa9e44 GM |
291 | So, if creation of the lock file fails due to access |
292 | permission on the mail spool directory, you simply MUST | |
293 | change the permission and/or make movemail a setgid program | |
a4deff3c RS |
294 | so it can create lock files properly. |
295 | ||
7eaa9e44 | 296 | You might also wish to verify that your system is one which |
0aa8781f | 297 | uses lock files for this purpose. Some systems use other methods. */ |
a4deff3c | 298 | |
c214e35e PE |
299 | inname_len = strlen (inname); |
300 | lockname = xmalloc (inname_len + sizeof ".lock"); | |
301 | strcpy (lockname, inname); | |
302 | strcpy (lockname + inname_len, ".lock"); | |
303 | for (inname_dirlen = inname_len; | |
529a133c PE |
304 | inname_dirlen && !IS_DIRECTORY_SEP (inname[inname_dirlen - 1]); |
305 | inname_dirlen--) | |
306 | continue; | |
e99a530f | 307 | tempname = xmalloc (inname_dirlen + sizeof "EXXXXXX"); |
237e0016 | 308 | |
a4deff3c | 309 | while (1) |
237e0016 | 310 | { |
a4deff3c RS |
311 | /* Create the lock file, but not under the lock file name. */ |
312 | /* Give up if cannot do that. */ | |
529a133c PE |
313 | |
314 | memcpy (tempname, inname, inname_dirlen); | |
315 | strcpy (tempname + inname_dirlen, "EXXXXXX"); | |
316 | #ifdef HAVE_MKSTEMP | |
317 | desc = mkstemp (tempname); | |
318 | #else | |
319 | mktemp (tempname); | |
320 | if (!*tempname) | |
321 | desc = -1; | |
322 | else | |
323 | { | |
324 | unlink (tempname); | |
325 | desc = open (tempname, O_WRONLY | O_CREAT | O_EXCL, 0600); | |
326 | } | |
327 | #endif | |
a4deff3c RS |
328 | if (desc < 0) |
329 | { | |
529a133c | 330 | int mkstemp_errno = errno; |
644a0faa PE |
331 | error ("error while creating what would become the lock file", |
332 | 0, 0); | |
529a133c | 333 | errno = mkstemp_errno; |
644a0faa | 334 | pfatal_with_name (tempname); |
a4deff3c RS |
335 | } |
336 | close (desc); | |
337 | ||
338 | tem = link (tempname, lockname); | |
097e9c90 CY |
339 | |
340 | #ifdef EPERM | |
341 | if (tem < 0 && errno == EPERM) | |
342 | fatal ("Unable to create hard link between %s and %s", | |
343 | tempname, lockname); | |
344 | #endif | |
345 | ||
a4deff3c RS |
346 | unlink (tempname); |
347 | if (tem >= 0) | |
348 | break; | |
349 | sleep (1); | |
350 | ||
351 | /* If lock file is five minutes old, unlock it. | |
352 | Five minutes should be good enough to cope with crashes | |
353 | and wedgitude, and long enough to avoid being fooled | |
354 | by time differences between machines. */ | |
355 | if (stat (lockname, &st) >= 0) | |
356 | { | |
5a9c1e26 | 357 | time_t now = time (0); |
a4deff3c RS |
358 | if (st.st_ctime < now - 300) |
359 | unlink (lockname); | |
360 | } | |
237e0016 | 361 | } |
237e0016 | 362 | |
a4deff3c RS |
363 | delete_lockname = lockname; |
364 | } | |
63cf923d RS |
365 | #endif /* not MAIL_USE_SYSTEM_LOCK */ |
366 | #endif /* not MAIL_USE_MMDF */ | |
237e0016 | 367 | |
8ca83cfd RS |
368 | if (fork () == 0) |
369 | { | |
25025815 | 370 | int lockcount = 0; |
a4deff3c RS |
371 | int status = 0; |
372 | #if defined (MAIL_USE_MAILLOCK) && defined (HAVE_TOUCHLOCK) | |
5a9c1e26 PE |
373 | time_t touched_lock; |
374 | # ifdef lint | |
375 | touched_lock = 0; | |
376 | # endif | |
a4deff3c | 377 | #endif |
25025815 | 378 | |
fbf4af3a | 379 | if (setuid (getuid ()) < 0 || setregid (-1, real_gid) < 0) |
51a91f9d | 380 | fatal ("Failed to drop privileges", 0, 0); |
8ca83cfd | 381 | |
63cf923d RS |
382 | #ifndef MAIL_USE_MMDF |
383 | #ifdef MAIL_USE_SYSTEM_LOCK | |
8ca83cfd | 384 | indesc = open (inname, O_RDWR); |
63cf923d | 385 | #else /* if not MAIL_USE_SYSTEM_LOCK */ |
8ca83cfd | 386 | indesc = open (inname, O_RDONLY); |
63cf923d | 387 | #endif /* not MAIL_USE_SYSTEM_LOCK */ |
8ca83cfd RS |
388 | #else /* MAIL_USE_MMDF */ |
389 | indesc = lk_open (inname, O_RDONLY, 0, 0, 10); | |
4293ba7f RS |
390 | #endif /* MAIL_USE_MMDF */ |
391 | ||
8ca83cfd RS |
392 | if (indesc < 0) |
393 | pfatal_with_name (inname); | |
237e0016 | 394 | |
76ed5e01 | 395 | #ifdef BSD_SYSTEM |
8ca83cfd RS |
396 | /* In case movemail is setuid to root, make sure the user can |
397 | read the output file. */ | |
398 | /* This is desirable for all systems | |
399 | but I don't want to assume all have the umask system call */ | |
400 | umask (umask (0) & 0333); | |
76ed5e01 | 401 | #endif /* BSD_SYSTEM */ |
8ca83cfd RS |
402 | outdesc = open (outname, O_WRONLY | O_CREAT | O_EXCL, 0666); |
403 | if (outdesc < 0) | |
404 | pfatal_with_name (outname); | |
25025815 | 405 | |
fbf4af3a | 406 | if (setregid (-1, priv_gid) < 0) |
51a91f9d CY |
407 | fatal ("Failed to regain privileges", 0, 0); |
408 | ||
25025815 RS |
409 | /* This label exists so we can retry locking |
410 | after a delay, if it got EAGAIN or EBUSY. */ | |
411 | retry_lock: | |
412 | ||
413 | /* Try to lock it. */ | |
a4deff3c RS |
414 | #ifdef MAIL_USE_MAILLOCK |
415 | if (spool_name) | |
416 | { | |
417 | /* The "0 - " is to make it a negative number if maillock returns | |
418 | non-zero. */ | |
419 | status = 0 - maillock (spool_name, 1); | |
420 | #ifdef HAVE_TOUCHLOCK | |
421 | touched_lock = time (0); | |
422 | #endif | |
423 | lockcount = 5; | |
424 | } | |
425 | else | |
426 | #endif /* MAIL_USE_MAILLOCK */ | |
427 | { | |
63cf923d RS |
428 | #ifdef MAIL_USE_SYSTEM_LOCK |
429 | #ifdef MAIL_USE_LOCKF | |
a4deff3c | 430 | status = lockf (indesc, F_LOCK, 0); |
63cf923d | 431 | #else /* not MAIL_USE_LOCKF */ |
7f75d5c6 | 432 | #ifdef WINDOWSNT |
a4deff3c | 433 | status = locking (indesc, LK_RLCK, -1L); |
237e0016 | 434 | #else |
a4deff3c | 435 | status = flock (indesc, LOCK_EX); |
237e0016 | 436 | #endif |
63cf923d RS |
437 | #endif /* not MAIL_USE_LOCKF */ |
438 | #endif /* MAIL_USE_SYSTEM_LOCK */ | |
a4deff3c | 439 | } |
237e0016 | 440 | |
25025815 RS |
441 | /* If it fails, retry up to 5 times |
442 | for certain failure codes. */ | |
443 | if (status < 0) | |
444 | { | |
445 | if (++lockcount <= 5) | |
446 | { | |
447 | #ifdef EAGAIN | |
448 | if (errno == EAGAIN) | |
449 | { | |
450 | sleep (1); | |
451 | goto retry_lock; | |
452 | } | |
453 | #endif | |
454 | #ifdef EBUSY | |
455 | if (errno == EBUSY) | |
456 | { | |
457 | sleep (1); | |
458 | goto retry_lock; | |
459 | } | |
460 | #endif | |
461 | } | |
462 | ||
463 | pfatal_with_name (inname); | |
464 | } | |
177c0ea7 | 465 | |
08564963 | 466 | { |
8ca83cfd RS |
467 | char buf[1024]; |
468 | ||
469 | while (1) | |
08564963 | 470 | { |
8ca83cfd | 471 | nread = read (indesc, buf, sizeof buf); |
5e5b35c7 RS |
472 | if (nread < 0) |
473 | pfatal_with_name (inname); | |
8ca83cfd RS |
474 | if (nread != write (outdesc, buf, nread)) |
475 | { | |
476 | int saved_errno = errno; | |
477 | unlink (outname); | |
478 | errno = saved_errno; | |
479 | pfatal_with_name (outname); | |
480 | } | |
481 | if (nread < sizeof buf) | |
482 | break; | |
a4deff3c RS |
483 | #if defined (MAIL_USE_MAILLOCK) && defined (HAVE_TOUCHLOCK) |
484 | if (spool_name) | |
485 | { | |
5a9c1e26 | 486 | time_t now = time (0); |
a4deff3c RS |
487 | if (now - touched_lock > 60) |
488 | { | |
489 | touchlock (); | |
490 | touched_lock = now; | |
491 | } | |
492 | } | |
493 | #endif /* MAIL_USE_MAILLOCK */ | |
08564963 | 494 | } |
08564963 | 495 | } |
237e0016 | 496 | |
e397a017 | 497 | #ifdef BSD_SYSTEM |
8ca83cfd RS |
498 | if (fsync (outdesc) < 0) |
499 | pfatal_and_delete (outname); | |
237e0016 RS |
500 | #endif |
501 | ||
51a91f9d | 502 | /* Prevent symlink attacks truncating other users' mailboxes */ |
fbf4af3a | 503 | if (setregid (-1, real_gid) < 0) |
51a91f9d CY |
504 | fatal ("Failed to drop privileges", 0, 0); |
505 | ||
8ca83cfd RS |
506 | /* Check to make sure no errors before we zap the inbox. */ |
507 | if (close (outdesc) != 0) | |
508 | pfatal_and_delete (outname); | |
237e0016 | 509 | |
63cf923d | 510 | #ifdef MAIL_USE_SYSTEM_LOCK |
fea4325c RS |
511 | if (! preserve_mail) |
512 | { | |
9055082e PE |
513 | if (ftruncate (indesc, 0L) != 0) |
514 | pfatal_with_name (inname); | |
b1cb2966 | 515 | } |
63cf923d | 516 | #endif /* MAIL_USE_SYSTEM_LOCK */ |
4293ba7f RS |
517 | |
518 | #ifdef MAIL_USE_MMDF | |
8ca83cfd | 519 | lk_close (indesc, 0, 0, 0); |
4293ba7f | 520 | #else |
8ca83cfd | 521 | close (indesc); |
4293ba7f | 522 | #endif |
237e0016 | 523 | |
63cf923d | 524 | #ifndef MAIL_USE_SYSTEM_LOCK |
fea4325c RS |
525 | if (! preserve_mail) |
526 | { | |
527 | /* Delete the input file; if we can't, at least get rid of its | |
528 | contents. */ | |
e97dd183 | 529 | #ifdef MAIL_UNLINK_SPOOL |
fea4325c RS |
530 | /* This is generally bad to do, because it destroys the permissions |
531 | that were set on the file. Better to just empty the file. */ | |
532 | if (unlink (inname) < 0 && errno != ENOENT) | |
e97dd183 | 533 | #endif /* MAIL_UNLINK_SPOOL */ |
fea4325c RS |
534 | creat (inname, 0600); |
535 | } | |
63cf923d | 536 | #endif /* not MAIL_USE_SYSTEM_LOCK */ |
8ca83cfd | 537 | |
51a91f9d | 538 | /* End of mailbox truncation */ |
fbf4af3a | 539 | if (setregid (-1, priv_gid) < 0) |
51a91f9d CY |
540 | fatal ("Failed to regain privileges", 0, 0); |
541 | ||
a4deff3c RS |
542 | #ifdef MAIL_USE_MAILLOCK |
543 | /* This has to occur in the child, i.e., in the process that | |
544 | acquired the lock! */ | |
545 | if (spool_name) | |
546 | mailunlock (); | |
547 | #endif | |
65396510 | 548 | exit (EXIT_SUCCESS); |
8ca83cfd RS |
549 | } |
550 | ||
27d41fb4 PE |
551 | wait (&wait_status); |
552 | if (!WIFEXITED (wait_status)) | |
65396510 | 553 | exit (EXIT_FAILURE); |
13294f95 PE |
554 | else if (WEXITSTATUS (wait_status) != 0) |
555 | exit (WEXITSTATUS (wait_status)); | |
8ca83cfd | 556 | |
63cf923d | 557 | #if !defined (MAIL_USE_MMDF) && !defined (MAIL_USE_SYSTEM_LOCK) |
a4deff3c RS |
558 | #ifdef MAIL_USE_MAILLOCK |
559 | if (! spool_name) | |
560 | #endif /* MAIL_USE_MAILLOCK */ | |
561 | unlink (lockname); | |
63cf923d | 562 | #endif /* not MAIL_USE_MMDF and not MAIL_USE_SYSTEM_LOCK */ |
7f75d5c6 RS |
563 | |
564 | #endif /* ! DISABLE_DIRECT_ACCESS */ | |
565 | ||
65396510 | 566 | return EXIT_SUCCESS; |
237e0016 | 567 | } |
a4deff3c RS |
568 | |
569 | #ifdef MAIL_USE_MAILLOCK | |
570 | /* This function uses stat to confirm that the mail directory is | |
571 | identical to the directory of the input file, rather than just | |
572 | string-comparing the two paths, because one or both of them might | |
573 | be symbolic links pointing to some other directory. */ | |
574 | static char * | |
728a982d | 575 | mail_spool_name (char *inname) |
a4deff3c RS |
576 | { |
577 | struct stat stat1, stat2; | |
578 | char *indir, *fname; | |
579 | int status; | |
580 | ||
8966b757 | 581 | if (! (fname = strrchr (inname, '/'))) |
a4deff3c RS |
582 | return NULL; |
583 | ||
584 | fname++; | |
585 | ||
586 | if (stat (MAILDIR, &stat1) < 0) | |
587 | return NULL; | |
588 | ||
e99a530f PE |
589 | indir = xmalloc (fname - inname + 1); |
590 | memcpy (indir, inname, fname - inname); | |
a4deff3c RS |
591 | indir[fname-inname] = '\0'; |
592 | ||
593 | ||
594 | status = stat (indir, &stat2); | |
595 | ||
596 | free (indir); | |
597 | ||
598 | if (status < 0) | |
599 | return NULL; | |
600 | ||
c4009c1f RS |
601 | if (stat1.st_dev == stat2.st_dev |
602 | && stat1.st_ino == stat2.st_ino) | |
a4deff3c RS |
603 | return fname; |
604 | ||
605 | return NULL; | |
606 | } | |
607 | #endif /* MAIL_USE_MAILLOCK */ | |
237e0016 RS |
608 | \f |
609 | /* Print error message and exit. */ | |
610 | ||
1725ae55 | 611 | static void |
988e88ab | 612 | fatal (const char *s1, const char *s2, const char *s3) |
237e0016 RS |
613 | { |
614 | if (delete_lockname) | |
615 | unlink (delete_lockname); | |
a9eedf40 | 616 | error (s1, s2, s3); |
65396510 | 617 | exit (EXIT_FAILURE); |
237e0016 RS |
618 | } |
619 | ||
cc3b64e8 DL |
620 | /* Print error message. `s1' is printf control string, `s2' and `s3' |
621 | are args for it or null. */ | |
237e0016 | 622 | |
1725ae55 | 623 | static void |
988e88ab | 624 | error (const char *s1, const char *s2, const char *s3) |
237e0016 | 625 | { |
e2f9d9af | 626 | fprintf (stderr, "movemail: "); |
cc3b64e8 DL |
627 | if (s3) |
628 | fprintf (stderr, s1, s2, s3); | |
629 | else if (s2) | |
630 | fprintf (stderr, s1, s2); | |
631 | else | |
3b3807f8 | 632 | fprintf (stderr, "%s", s1); |
e2f9d9af | 633 | fprintf (stderr, "\n"); |
237e0016 RS |
634 | } |
635 | ||
1725ae55 | 636 | static void |
873fbd0b | 637 | pfatal_with_name (char *name) |
237e0016 | 638 | { |
a9eedf40 | 639 | fatal ("%s for %s", strerror (errno), name); |
237e0016 RS |
640 | } |
641 | ||
1725ae55 | 642 | static void |
873fbd0b | 643 | pfatal_and_delete (char *name) |
cfa191ff | 644 | { |
a9eedf40 | 645 | char *s = strerror (errno); |
cfa191ff | 646 | unlink (name); |
a9eedf40 | 647 | fatal ("%s for %s", s, name); |
cfa191ff | 648 | } |
237e0016 RS |
649 | \f |
650 | /* This is the guts of the interface to the Post Office Protocol. */ | |
651 | ||
652 | #ifdef MAIL_USE_POP | |
653 | ||
7f75d5c6 | 654 | #ifndef WINDOWSNT |
237e0016 RS |
655 | #include <sys/socket.h> |
656 | #include <netinet/in.h> | |
657 | #include <netdb.h> | |
7f75d5c6 RS |
658 | #else |
659 | #undef _WINSOCKAPI_ | |
660 | #include <winsock.h> | |
661 | #endif | |
cecf0f21 | 662 | #include <pwd.h> |
d228a23c | 663 | #include <string.h> |
237e0016 | 664 | |
237e0016 RS |
665 | #define NOTOK (-1) |
666 | #define OK 0 | |
237e0016 | 667 | |
b23b5a5b | 668 | static char Errmsg[200]; /* POP errors, at least, can exceed |
752fb472 | 669 | the original length of 80. */ |
237e0016 | 670 | |
476b2799 | 671 | /* |
4d90eee4 | 672 | * The full valid syntax for a POP mailbox specification for movemail |
476b2799 GM |
673 | * is "po:username:hostname". The ":hostname" is optional; if it is |
674 | * omitted, the MAILHOST environment variable will be consulted. Note | |
675 | * that by the time popmail() is called the "po:" has been stripped | |
676 | * off of the front of the mailbox name. | |
677 | * | |
678 | * If the mailbox is in the form "po:username:hostname", then it is | |
679 | * modified by this function -- the second colon is replaced by a | |
680 | * null. | |
65396510 TTN |
681 | * |
682 | * Return a value suitable for passing to `exit'. | |
476b2799 GM |
683 | */ |
684 | ||
1725ae55 | 685 | static int |
873fbd0b | 686 | popmail (char *mailbox, char *outfile, int preserve, char *password, int reverse_order) |
237e0016 | 687 | { |
b1ce62a8 | 688 | int nmsgs, nbytes; |
b1ce62a8 RS |
689 | register int i; |
690 | int mbfi; | |
691 | FILE *mbf; | |
873fbd0b | 692 | char *getenv (const char *); |
b32701a7 | 693 | popserver server; |
a2997b0f | 694 | int start, end, increment; |
476b2799 GM |
695 | char *user, *hostname; |
696 | ||
697 | user = mailbox; | |
8966b757 | 698 | if ((hostname = strchr (mailbox, ':'))) |
476b2799 | 699 | *hostname++ = '\0'; |
237e0016 | 700 | |
476b2799 | 701 | server = pop_open (hostname, user, password, POP_NO_GETPASS); |
2e82e3c3 | 702 | if (! server) |
b1ce62a8 | 703 | { |
cc3b64e8 | 704 | error ("Error connecting to POP server: %s", pop_error, 0); |
65396510 | 705 | return EXIT_FAILURE; |
237e0016 RS |
706 | } |
707 | ||
2e82e3c3 | 708 | if (pop_stat (server, &nmsgs, &nbytes)) |
b1ce62a8 | 709 | { |
cc3b64e8 | 710 | error ("Error getting message count from POP server: %s", pop_error, 0); |
65396510 | 711 | return EXIT_FAILURE; |
237e0016 RS |
712 | } |
713 | ||
b1ce62a8 RS |
714 | if (!nmsgs) |
715 | { | |
2e82e3c3 | 716 | pop_close (server); |
65396510 | 717 | return EXIT_SUCCESS; |
b1ce62a8 RS |
718 | } |
719 | ||
720 | mbfi = open (outfile, O_WRONLY | O_CREAT | O_EXCL, 0666); | |
721 | if (mbfi < 0) | |
722 | { | |
2e82e3c3 RS |
723 | pop_close (server); |
724 | error ("Error in open: %s, %s", strerror (errno), outfile); | |
65396510 | 725 | return EXIT_FAILURE; |
b1ce62a8 | 726 | } |
f0939c31 PE |
727 | |
728 | if (fchown (mbfi, getuid (), -1) != 0) | |
729 | { | |
730 | int fchown_errno = errno; | |
731 | struct stat st; | |
732 | if (fstat (mbfi, &st) != 0 || st.st_uid != getuid ()) | |
733 | { | |
734 | pop_close (server); | |
735 | error ("Error in fchown: %s, %s", strerror (fchown_errno), outfile); | |
736 | return EXIT_FAILURE; | |
737 | } | |
738 | } | |
b1ce62a8 | 739 | |
7f75d5c6 | 740 | if ((mbf = fdopen (mbfi, "wb")) == NULL) |
b1ce62a8 | 741 | { |
2e82e3c3 | 742 | pop_close (server); |
cc3b64e8 | 743 | error ("Error in fdopen: %s", strerror (errno), 0); |
2e82e3c3 RS |
744 | close (mbfi); |
745 | unlink (outfile); | |
65396510 | 746 | return EXIT_FAILURE; |
b1ce62a8 RS |
747 | } |
748 | ||
a2997b0f KH |
749 | if (reverse_order) |
750 | { | |
751 | start = nmsgs; | |
752 | end = 1; | |
753 | increment = -1; | |
754 | } | |
755 | else | |
756 | { | |
757 | start = 1; | |
758 | end = nmsgs; | |
759 | increment = 1; | |
760 | } | |
761 | ||
762 | for (i = start; i * increment <= end * increment; i += increment) | |
b1ce62a8 RS |
763 | { |
764 | mbx_delimit_begin (mbf); | |
ff804ff5 | 765 | if (pop_retr (server, i, mbf) != OK) |
b1ce62a8 | 766 | { |
17a60964 | 767 | error ("%s", Errmsg, 0); |
b1ce62a8 | 768 | close (mbfi); |
65396510 | 769 | return EXIT_FAILURE; |
237e0016 | 770 | } |
b1ce62a8 RS |
771 | mbx_delimit_end (mbf); |
772 | fflush (mbf); | |
2e82e3c3 RS |
773 | if (ferror (mbf)) |
774 | { | |
cc3b64e8 | 775 | error ("Error in fflush: %s", strerror (errno), 0); |
2e82e3c3 RS |
776 | pop_close (server); |
777 | close (mbfi); | |
65396510 | 778 | return EXIT_FAILURE; |
2e82e3c3 | 779 | } |
237e0016 RS |
780 | } |
781 | ||
2e82e3c3 RS |
782 | /* On AFS, a call to write only modifies the file in the local |
783 | * workstation's AFS cache. The changes are not written to the server | |
784 | * until a call to fsync or close is made. Users with AFS home | |
785 | * directories have lost mail when over quota because these checks were | |
786 | * not made in previous versions of movemail. */ | |
787 | ||
e397a017 | 788 | #ifdef BSD_SYSTEM |
cfa191ff RS |
789 | if (fsync (mbfi) < 0) |
790 | { | |
08fa58c9 | 791 | error ("Error in fsync: %s", strerror (errno), 0); |
65396510 | 792 | return EXIT_FAILURE; |
cfa191ff | 793 | } |
340ff9de | 794 | #endif |
cfa191ff RS |
795 | |
796 | if (close (mbfi) == -1) | |
797 | { | |
cc3b64e8 | 798 | error ("Error in close: %s", strerror (errno), 0); |
65396510 | 799 | return EXIT_FAILURE; |
cfa191ff RS |
800 | } |
801 | ||
fea4325c RS |
802 | if (! preserve) |
803 | for (i = 1; i <= nmsgs; i++) | |
804 | { | |
805 | if (pop_delete (server, i)) | |
806 | { | |
cc3b64e8 | 807 | error ("Error from POP server: %s", pop_error, 0); |
fea4325c | 808 | pop_close (server); |
65396510 | 809 | return EXIT_FAILURE; |
fea4325c RS |
810 | } |
811 | } | |
237e0016 | 812 | |
2e82e3c3 | 813 | if (pop_quit (server)) |
b1ce62a8 | 814 | { |
cc3b64e8 | 815 | error ("Error from POP server: %s", pop_error, 0); |
65396510 | 816 | return EXIT_FAILURE; |
237e0016 | 817 | } |
177c0ea7 | 818 | |
65396510 | 819 | return EXIT_SUCCESS; |
237e0016 RS |
820 | } |
821 | ||
1725ae55 | 822 | static int |
873fbd0b | 823 | pop_retr (popserver server, int msgno, FILE *arg) |
237e0016 | 824 | { |
2e82e3c3 RS |
825 | char *line; |
826 | int ret; | |
237e0016 | 827 | |
2e82e3c3 | 828 | if (pop_retrieve_first (server, msgno, &line)) |
b1ce62a8 | 829 | { |
e99a530f | 830 | snprintf (Errmsg, sizeof Errmsg, "Error from POP server: %s", pop_error); |
2e82e3c3 | 831 | return (NOTOK); |
237e0016 RS |
832 | } |
833 | ||
d89d0243 | 834 | while ((ret = pop_retrieve_next (server, &line)) >= 0) |
b1ce62a8 | 835 | { |
2e82e3c3 RS |
836 | if (! line) |
837 | break; | |
838 | ||
d89d0243 | 839 | if (mbx_write (line, ret, arg) != OK) |
b1ce62a8 | 840 | { |
2e82e3c3 RS |
841 | strcpy (Errmsg, strerror (errno)); |
842 | pop_close (server); | |
843 | return (NOTOK); | |
237e0016 RS |
844 | } |
845 | } | |
237e0016 | 846 | |
2e82e3c3 | 847 | if (ret) |
b1ce62a8 | 848 | { |
e99a530f | 849 | snprintf (Errmsg, sizeof Errmsg, "Error from POP server: %s", pop_error); |
2e82e3c3 | 850 | return (NOTOK); |
237e0016 RS |
851 | } |
852 | ||
2e82e3c3 | 853 | return (OK); |
237e0016 RS |
854 | } |
855 | ||
1725ae55 | 856 | static int |
873fbd0b | 857 | mbx_write (char *line, int len, FILE *mbf) |
237e0016 | 858 | { |
d04f5031 | 859 | #ifdef MOVEMAIL_QUOTE_POP_FROM_LINES |
5ecec6a7 PE |
860 | /* Do this as a macro instead of using strcmp to save on execution time. */ |
861 | # define IS_FROM_LINE(a) ((a[0] == 'F') \ | |
862 | && (a[1] == 'r') \ | |
863 | && (a[2] == 'o') \ | |
864 | && (a[3] == 'm') \ | |
865 | && (a[4] == ' ')) | |
2e82e3c3 RS |
866 | if (IS_FROM_LINE (line)) |
867 | { | |
868 | if (fputc ('>', mbf) == EOF) | |
869 | return (NOTOK); | |
870 | } | |
d04f5031 PE |
871 | #endif |
872 | if (line[0] == '\037') | |
873 | { | |
874 | if (fputs ("^_", mbf) == EOF) | |
875 | return (NOTOK); | |
876 | line++; | |
877 | len--; | |
878 | } | |
177c0ea7 | 879 | if (fwrite (line, 1, len, mbf) != len) |
2e82e3c3 RS |
880 | return (NOTOK); |
881 | if (fputc (0x0a, mbf) == EOF) | |
882 | return (NOTOK); | |
883 | return (OK); | |
237e0016 RS |
884 | } |
885 | ||
1725ae55 | 886 | static int |
873fbd0b | 887 | mbx_delimit_begin (FILE *mbf) |
237e0016 | 888 | { |
d228a23c GM |
889 | time_t now; |
890 | struct tm *ltime; | |
891 | char fromline[40] = "From movemail "; | |
892 | ||
893 | now = time (NULL); | |
894 | ltime = localtime (&now); | |
895 | ||
896 | strcat (fromline, asctime (ltime)); | |
897 | ||
898 | if (fputs (fromline, mbf) == EOF) | |
2e82e3c3 RS |
899 | return (NOTOK); |
900 | return (OK); | |
237e0016 RS |
901 | } |
902 | ||
1725ae55 | 903 | static int |
873fbd0b | 904 | mbx_delimit_end (FILE *mbf) |
237e0016 | 905 | { |
3f32be22 | 906 | if (putc ('\n', mbf) == EOF) |
2e82e3c3 RS |
907 | return (NOTOK); |
908 | return (OK); | |
237e0016 RS |
909 | } |
910 | ||
911 | #endif /* MAIL_USE_POP */ |