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 | |
25 | use flock as its way of interlocking access to inbox files. The | |
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 | ||
63cf923d RS |
112 | #ifdef MAIL_USE_LOCKF |
113 | #define MAIL_USE_SYSTEM_LOCK | |
114 | #endif | |
115 | ||
116 | #ifdef MAIL_USE_FLOCK | |
117 | #define MAIL_USE_SYSTEM_LOCK | |
118 | #endif | |
119 | ||
4293ba7f RS |
120 | #ifdef MAIL_USE_MMDF |
121 | extern int lk_open (), lk_close (); | |
122 | #endif | |
123 | ||
a4deff3c | 124 | #if !defined (MAIL_USE_SYSTEM_LOCK) && !defined (MAIL_USE_MMDF) && \ |
dd843b6a DL |
125 | (defined (HAVE_LIBMAIL) || defined (HAVE_LIBLOCKFILE)) && \ |
126 | defined (HAVE_MAILLOCK_H) | |
a4deff3c RS |
127 | #include <maillock.h> |
128 | /* We can't use maillock unless we know what directory system mail | |
129 | files appear in. */ | |
130 | #ifdef MAILDIR | |
131 | #define MAIL_USE_MAILLOCK | |
5a9c1e26 | 132 | static char *mail_spool_name (char *); |
a4deff3c RS |
133 | #endif |
134 | #endif | |
135 | ||
845ca893 | 136 | static _Noreturn void fatal (const char *s1, const char *s2, const char *s3); |
988e88ab | 137 | static void error (const char *s1, const char *s2, const char *s3); |
845ca893 PE |
138 | static _Noreturn void pfatal_with_name (char *name); |
139 | static _Noreturn void pfatal_and_delete (char *name); | |
e2ad23ef | 140 | #ifdef MAIL_USE_POP |
1725ae55 AS |
141 | static int popmail (char *mailbox, char *outfile, int preserve, char *password, int reverse_order); |
142 | static int pop_retr (popserver server, int msgno, FILE *arg); | |
143 | static int mbx_write (char *line, int len, FILE *mbf); | |
144 | static int mbx_delimit_begin (FILE *mbf); | |
145 | static int mbx_delimit_end (FILE *mbf); | |
e2ad23ef | 146 | #endif |
237e0016 | 147 | |
debd9b27 | 148 | #if (defined MAIL_USE_MAILLOCK \ |
c214e35e PE |
149 | || (!defined DISABLE_DIRECT_ACCESS && !defined MAIL_USE_MMDF \ |
150 | && !defined MAIL_USE_SYSTEM_LOCK)) | |
151 | /* Like malloc but get fatal error if memory is exhausted. */ | |
152 | ||
153 | static void * | |
154 | xmalloc (size_t size) | |
155 | { | |
156 | void *result = malloc (size); | |
157 | if (!result) | |
158 | fatal ("virtual memory exhausted", 0, 0); | |
159 | return result; | |
160 | } | |
161 | #endif | |
162 | ||
237e0016 | 163 | /* Nonzero means this is name of a lock file to delete on fatal error. */ |
b23b5a5b | 164 | static char *delete_lockname; |
237e0016 | 165 | |
e2f9d9af | 166 | int |
873fbd0b | 167 | main (int argc, char **argv) |
237e0016 RS |
168 | { |
169 | char *inname, *outname; | |
170 | int indesc, outdesc; | |
728a982d | 171 | ssize_t nread; |
27d41fb4 | 172 | int wait_status; |
fea4325c | 173 | int c, preserve_mail = 0; |
237e0016 | 174 | |
63cf923d | 175 | #ifndef MAIL_USE_SYSTEM_LOCK |
237e0016 | 176 | struct stat st; |
237e0016 | 177 | int tem; |
529a133c | 178 | char *lockname; |
906ad89d | 179 | char *tempname; |
c214e35e | 180 | size_t inname_len, inname_dirlen; |
237e0016 | 181 | int desc; |
63cf923d | 182 | #endif /* not MAIL_USE_SYSTEM_LOCK */ |
237e0016 | 183 | |
a4deff3c RS |
184 | #ifdef MAIL_USE_MAILLOCK |
185 | char *spool_name; | |
186 | #endif | |
187 | ||
a2997b0f KH |
188 | #ifdef MAIL_USE_POP |
189 | int pop_reverse_order = 0; | |
190 | # define ARGSTR "pr" | |
191 | #else /* ! MAIL_USE_POP */ | |
192 | # define ARGSTR "p" | |
193 | #endif /* MAIL_USE_POP */ | |
194 | ||
5e617bc2 JB |
195 | uid_t real_gid = getgid (); |
196 | uid_t priv_gid = getegid (); | |
51a91f9d | 197 | |
9112a2a9 AI |
198 | #ifdef WINDOWSNT |
199 | /* Ensure all file i/o is in binary mode. */ | |
200 | _fmode = _O_BINARY; | |
201 | #endif | |
202 | ||
237e0016 RS |
203 | delete_lockname = 0; |
204 | ||
a2997b0f | 205 | while ((c = getopt (argc, argv, ARGSTR)) != EOF) |
e2f9d9af | 206 | { |
fea4325c | 207 | switch (c) { |
a2997b0f KH |
208 | #ifdef MAIL_USE_POP |
209 | case 'r': | |
210 | pop_reverse_order = 1; | |
211 | break; | |
212 | #endif | |
fea4325c RS |
213 | case 'p': |
214 | preserve_mail++; | |
215 | break; | |
216 | default: | |
65396510 | 217 | exit (EXIT_FAILURE); |
fea4325c RS |
218 | } |
219 | } | |
220 | ||
221 | if ( | |
222 | #ifdef MAIL_USE_POP | |
223 | (argc - optind < 2) || (argc - optind > 3) | |
224 | #else | |
225 | (argc - optind != 2) | |
226 | #endif | |
227 | ) | |
228 | { | |
fea4325c | 229 | #ifdef MAIL_USE_POP |
f213f2c0 | 230 | fprintf (stderr, "Usage: movemail [-p] [-r] inbox destfile%s\n", |
bb5618fe | 231 | " [POP-password]"); |
fea4325c | 232 | #else |
bb5618fe | 233 | fprintf (stderr, "Usage: movemail [-p] inbox destfile%s\n", ""); |
fea4325c | 234 | #endif |
65396510 | 235 | exit (EXIT_FAILURE); |
e2f9d9af | 236 | } |
237e0016 | 237 | |
fea4325c RS |
238 | inname = argv[optind]; |
239 | outname = argv[optind+1]; | |
237e0016 | 240 | |
4293ba7f RS |
241 | #ifdef MAIL_USE_MMDF |
242 | mmdf_init (argv[0]); | |
243 | #endif | |
244 | ||
af7bd34e | 245 | if (*outname == 0) |
a9eedf40 | 246 | fatal ("Destination file name is empty", 0, 0); |
af7bd34e | 247 | |
237e0016 | 248 | #ifdef MAIL_USE_POP |
12a0565a | 249 | if (!strncmp (inname, "po:", 3)) |
237e0016 | 250 | { |
b3112191 | 251 | int status; |
237e0016 | 252 | |
fea4325c | 253 | status = popmail (inname + 3, outname, preserve_mail, |
a2997b0f KH |
254 | (argc - optind == 3) ? argv[optind+2] : NULL, |
255 | pop_reverse_order); | |
237e0016 RS |
256 | exit (status); |
257 | } | |
258 | ||
51a91f9d CY |
259 | if (setuid (getuid ()) < 0) |
260 | fatal ("Failed to drop privileges", 0, 0); | |
261 | ||
237e0016 RS |
262 | #endif /* MAIL_USE_POP */ |
263 | ||
7f75d5c6 | 264 | #ifndef DISABLE_DIRECT_ACCESS |
4293ba7f | 265 | #ifndef MAIL_USE_MMDF |
63cf923d | 266 | #ifndef MAIL_USE_SYSTEM_LOCK |
a4deff3c RS |
267 | #ifdef MAIL_USE_MAILLOCK |
268 | spool_name = mail_spool_name (inname); | |
5a9c1e26 PE |
269 | if (spool_name) |
270 | { | |
271 | #ifdef lint | |
272 | lockname = 0; | |
273 | #endif | |
274 | } | |
275 | else | |
a4deff3c | 276 | #endif |
237e0016 | 277 | { |
5ecec6a7 PE |
278 | #ifndef DIRECTORY_SEP |
279 | #define DIRECTORY_SEP '/' | |
280 | #endif | |
281 | #ifndef IS_DIRECTORY_SEP | |
282 | #define IS_DIRECTORY_SEP(_c_) ((_c_) == DIRECTORY_SEP) | |
283 | #endif | |
284 | ||
a4deff3c RS |
285 | /* Use a lock file named after our first argument with .lock appended: |
286 | If it exists, the mail file is locked. */ | |
287 | /* Note: this locking mechanism is *required* by the mailer | |
288 | (on systems which use it) to prevent loss of mail. | |
289 | ||
290 | On systems that use a lock file, extracting the mail without locking | |
291 | WILL occasionally cause loss of mail due to timing errors! | |
292 | ||
293 | So, if creation of the lock file fails | |
294 | due to access permission on the mail spool directory, | |
295 | you simply MUST change the permission | |
296 | and/or make movemail a setgid program | |
297 | so it can create lock files properly. | |
298 | ||
299 | You might also wish to verify that your system is one | |
300 | which uses lock files for this purpose. Some systems use other methods. | |
301 | ||
302 | If your system uses the `flock' system call for mail locking, | |
303 | define MAIL_USE_SYSTEM_LOCK in config.h or the s-*.h file | |
304 | and recompile movemail. If the s- file for your system | |
305 | should define MAIL_USE_SYSTEM_LOCK but does not, send a bug report | |
306 | to bug-gnu-emacs@prep.ai.mit.edu so we can fix it. */ | |
307 | ||
c214e35e PE |
308 | inname_len = strlen (inname); |
309 | lockname = xmalloc (inname_len + sizeof ".lock"); | |
310 | strcpy (lockname, inname); | |
311 | strcpy (lockname + inname_len, ".lock"); | |
312 | for (inname_dirlen = inname_len; | |
529a133c PE |
313 | inname_dirlen && !IS_DIRECTORY_SEP (inname[inname_dirlen - 1]); |
314 | inname_dirlen--) | |
315 | continue; | |
e99a530f | 316 | tempname = xmalloc (inname_dirlen + sizeof "EXXXXXX"); |
237e0016 | 317 | |
a4deff3c | 318 | while (1) |
237e0016 | 319 | { |
a4deff3c RS |
320 | /* Create the lock file, but not under the lock file name. */ |
321 | /* Give up if cannot do that. */ | |
529a133c PE |
322 | |
323 | memcpy (tempname, inname, inname_dirlen); | |
324 | strcpy (tempname + inname_dirlen, "EXXXXXX"); | |
325 | #ifdef HAVE_MKSTEMP | |
326 | desc = mkstemp (tempname); | |
327 | #else | |
328 | mktemp (tempname); | |
329 | if (!*tempname) | |
330 | desc = -1; | |
331 | else | |
332 | { | |
333 | unlink (tempname); | |
334 | desc = open (tempname, O_WRONLY | O_CREAT | O_EXCL, 0600); | |
335 | } | |
336 | #endif | |
a4deff3c RS |
337 | if (desc < 0) |
338 | { | |
529a133c | 339 | int mkstemp_errno = errno; |
644a0faa PE |
340 | error ("error while creating what would become the lock file", |
341 | 0, 0); | |
529a133c | 342 | errno = mkstemp_errno; |
644a0faa | 343 | pfatal_with_name (tempname); |
a4deff3c RS |
344 | } |
345 | close (desc); | |
346 | ||
347 | tem = link (tempname, lockname); | |
097e9c90 CY |
348 | |
349 | #ifdef EPERM | |
350 | if (tem < 0 && errno == EPERM) | |
351 | fatal ("Unable to create hard link between %s and %s", | |
352 | tempname, lockname); | |
353 | #endif | |
354 | ||
a4deff3c RS |
355 | unlink (tempname); |
356 | if (tem >= 0) | |
357 | break; | |
358 | sleep (1); | |
359 | ||
360 | /* If lock file is five minutes old, unlock it. | |
361 | Five minutes should be good enough to cope with crashes | |
362 | and wedgitude, and long enough to avoid being fooled | |
363 | by time differences between machines. */ | |
364 | if (stat (lockname, &st) >= 0) | |
365 | { | |
5a9c1e26 | 366 | time_t now = time (0); |
a4deff3c RS |
367 | if (st.st_ctime < now - 300) |
368 | unlink (lockname); | |
369 | } | |
237e0016 | 370 | } |
237e0016 | 371 | |
a4deff3c RS |
372 | delete_lockname = lockname; |
373 | } | |
63cf923d RS |
374 | #endif /* not MAIL_USE_SYSTEM_LOCK */ |
375 | #endif /* not MAIL_USE_MMDF */ | |
237e0016 | 376 | |
8ca83cfd RS |
377 | if (fork () == 0) |
378 | { | |
25025815 | 379 | int lockcount = 0; |
a4deff3c RS |
380 | int status = 0; |
381 | #if defined (MAIL_USE_MAILLOCK) && defined (HAVE_TOUCHLOCK) | |
5a9c1e26 PE |
382 | time_t touched_lock; |
383 | # ifdef lint | |
384 | touched_lock = 0; | |
385 | # endif | |
a4deff3c | 386 | #endif |
25025815 | 387 | |
fbf4af3a | 388 | if (setuid (getuid ()) < 0 || setregid (-1, real_gid) < 0) |
51a91f9d | 389 | fatal ("Failed to drop privileges", 0, 0); |
8ca83cfd | 390 | |
63cf923d RS |
391 | #ifndef MAIL_USE_MMDF |
392 | #ifdef MAIL_USE_SYSTEM_LOCK | |
8ca83cfd | 393 | indesc = open (inname, O_RDWR); |
63cf923d | 394 | #else /* if not MAIL_USE_SYSTEM_LOCK */ |
8ca83cfd | 395 | indesc = open (inname, O_RDONLY); |
63cf923d | 396 | #endif /* not MAIL_USE_SYSTEM_LOCK */ |
8ca83cfd RS |
397 | #else /* MAIL_USE_MMDF */ |
398 | indesc = lk_open (inname, O_RDONLY, 0, 0, 10); | |
4293ba7f RS |
399 | #endif /* MAIL_USE_MMDF */ |
400 | ||
8ca83cfd RS |
401 | if (indesc < 0) |
402 | pfatal_with_name (inname); | |
237e0016 | 403 | |
76ed5e01 | 404 | #ifdef BSD_SYSTEM |
8ca83cfd RS |
405 | /* In case movemail is setuid to root, make sure the user can |
406 | read the output file. */ | |
407 | /* This is desirable for all systems | |
408 | but I don't want to assume all have the umask system call */ | |
409 | umask (umask (0) & 0333); | |
76ed5e01 | 410 | #endif /* BSD_SYSTEM */ |
8ca83cfd RS |
411 | outdesc = open (outname, O_WRONLY | O_CREAT | O_EXCL, 0666); |
412 | if (outdesc < 0) | |
413 | pfatal_with_name (outname); | |
25025815 | 414 | |
fbf4af3a | 415 | if (setregid (-1, priv_gid) < 0) |
51a91f9d CY |
416 | fatal ("Failed to regain privileges", 0, 0); |
417 | ||
25025815 RS |
418 | /* This label exists so we can retry locking |
419 | after a delay, if it got EAGAIN or EBUSY. */ | |
420 | retry_lock: | |
421 | ||
422 | /* Try to lock it. */ | |
a4deff3c RS |
423 | #ifdef MAIL_USE_MAILLOCK |
424 | if (spool_name) | |
425 | { | |
426 | /* The "0 - " is to make it a negative number if maillock returns | |
427 | non-zero. */ | |
428 | status = 0 - maillock (spool_name, 1); | |
429 | #ifdef HAVE_TOUCHLOCK | |
430 | touched_lock = time (0); | |
431 | #endif | |
432 | lockcount = 5; | |
433 | } | |
434 | else | |
435 | #endif /* MAIL_USE_MAILLOCK */ | |
436 | { | |
63cf923d RS |
437 | #ifdef MAIL_USE_SYSTEM_LOCK |
438 | #ifdef MAIL_USE_LOCKF | |
a4deff3c | 439 | status = lockf (indesc, F_LOCK, 0); |
63cf923d | 440 | #else /* not MAIL_USE_LOCKF */ |
7f75d5c6 | 441 | #ifdef WINDOWSNT |
a4deff3c | 442 | status = locking (indesc, LK_RLCK, -1L); |
237e0016 | 443 | #else |
a4deff3c | 444 | status = flock (indesc, LOCK_EX); |
237e0016 | 445 | #endif |
63cf923d RS |
446 | #endif /* not MAIL_USE_LOCKF */ |
447 | #endif /* MAIL_USE_SYSTEM_LOCK */ | |
a4deff3c | 448 | } |
237e0016 | 449 | |
25025815 RS |
450 | /* If it fails, retry up to 5 times |
451 | for certain failure codes. */ | |
452 | if (status < 0) | |
453 | { | |
454 | if (++lockcount <= 5) | |
455 | { | |
456 | #ifdef EAGAIN | |
457 | if (errno == EAGAIN) | |
458 | { | |
459 | sleep (1); | |
460 | goto retry_lock; | |
461 | } | |
462 | #endif | |
463 | #ifdef EBUSY | |
464 | if (errno == EBUSY) | |
465 | { | |
466 | sleep (1); | |
467 | goto retry_lock; | |
468 | } | |
469 | #endif | |
470 | } | |
471 | ||
472 | pfatal_with_name (inname); | |
473 | } | |
177c0ea7 | 474 | |
08564963 | 475 | { |
8ca83cfd RS |
476 | char buf[1024]; |
477 | ||
478 | while (1) | |
08564963 | 479 | { |
8ca83cfd | 480 | nread = read (indesc, buf, sizeof buf); |
5e5b35c7 RS |
481 | if (nread < 0) |
482 | pfatal_with_name (inname); | |
8ca83cfd RS |
483 | if (nread != write (outdesc, buf, nread)) |
484 | { | |
485 | int saved_errno = errno; | |
486 | unlink (outname); | |
487 | errno = saved_errno; | |
488 | pfatal_with_name (outname); | |
489 | } | |
490 | if (nread < sizeof buf) | |
491 | break; | |
a4deff3c RS |
492 | #if defined (MAIL_USE_MAILLOCK) && defined (HAVE_TOUCHLOCK) |
493 | if (spool_name) | |
494 | { | |
5a9c1e26 | 495 | time_t now = time (0); |
a4deff3c RS |
496 | if (now - touched_lock > 60) |
497 | { | |
498 | touchlock (); | |
499 | touched_lock = now; | |
500 | } | |
501 | } | |
502 | #endif /* MAIL_USE_MAILLOCK */ | |
08564963 | 503 | } |
08564963 | 504 | } |
237e0016 | 505 | |
e397a017 | 506 | #ifdef BSD_SYSTEM |
8ca83cfd RS |
507 | if (fsync (outdesc) < 0) |
508 | pfatal_and_delete (outname); | |
237e0016 RS |
509 | #endif |
510 | ||
51a91f9d | 511 | /* Prevent symlink attacks truncating other users' mailboxes */ |
fbf4af3a | 512 | if (setregid (-1, real_gid) < 0) |
51a91f9d CY |
513 | fatal ("Failed to drop privileges", 0, 0); |
514 | ||
8ca83cfd RS |
515 | /* Check to make sure no errors before we zap the inbox. */ |
516 | if (close (outdesc) != 0) | |
517 | pfatal_and_delete (outname); | |
237e0016 | 518 | |
63cf923d | 519 | #ifdef MAIL_USE_SYSTEM_LOCK |
fea4325c RS |
520 | if (! preserve_mail) |
521 | { | |
9055082e PE |
522 | if (ftruncate (indesc, 0L) != 0) |
523 | pfatal_with_name (inname); | |
b1cb2966 | 524 | } |
63cf923d | 525 | #endif /* MAIL_USE_SYSTEM_LOCK */ |
4293ba7f RS |
526 | |
527 | #ifdef MAIL_USE_MMDF | |
8ca83cfd | 528 | lk_close (indesc, 0, 0, 0); |
4293ba7f | 529 | #else |
8ca83cfd | 530 | close (indesc); |
4293ba7f | 531 | #endif |
237e0016 | 532 | |
63cf923d | 533 | #ifndef MAIL_USE_SYSTEM_LOCK |
fea4325c RS |
534 | if (! preserve_mail) |
535 | { | |
536 | /* Delete the input file; if we can't, at least get rid of its | |
537 | contents. */ | |
e97dd183 | 538 | #ifdef MAIL_UNLINK_SPOOL |
fea4325c RS |
539 | /* This is generally bad to do, because it destroys the permissions |
540 | that were set on the file. Better to just empty the file. */ | |
541 | if (unlink (inname) < 0 && errno != ENOENT) | |
e97dd183 | 542 | #endif /* MAIL_UNLINK_SPOOL */ |
fea4325c RS |
543 | creat (inname, 0600); |
544 | } | |
63cf923d | 545 | #endif /* not MAIL_USE_SYSTEM_LOCK */ |
8ca83cfd | 546 | |
51a91f9d | 547 | /* End of mailbox truncation */ |
fbf4af3a | 548 | if (setregid (-1, priv_gid) < 0) |
51a91f9d CY |
549 | fatal ("Failed to regain privileges", 0, 0); |
550 | ||
a4deff3c RS |
551 | #ifdef MAIL_USE_MAILLOCK |
552 | /* This has to occur in the child, i.e., in the process that | |
553 | acquired the lock! */ | |
554 | if (spool_name) | |
555 | mailunlock (); | |
556 | #endif | |
65396510 | 557 | exit (EXIT_SUCCESS); |
8ca83cfd RS |
558 | } |
559 | ||
27d41fb4 PE |
560 | wait (&wait_status); |
561 | if (!WIFEXITED (wait_status)) | |
65396510 | 562 | exit (EXIT_FAILURE); |
13294f95 PE |
563 | else if (WEXITSTATUS (wait_status) != 0) |
564 | exit (WEXITSTATUS (wait_status)); | |
8ca83cfd | 565 | |
63cf923d | 566 | #if !defined (MAIL_USE_MMDF) && !defined (MAIL_USE_SYSTEM_LOCK) |
a4deff3c RS |
567 | #ifdef MAIL_USE_MAILLOCK |
568 | if (! spool_name) | |
569 | #endif /* MAIL_USE_MAILLOCK */ | |
570 | unlink (lockname); | |
63cf923d | 571 | #endif /* not MAIL_USE_MMDF and not MAIL_USE_SYSTEM_LOCK */ |
7f75d5c6 RS |
572 | |
573 | #endif /* ! DISABLE_DIRECT_ACCESS */ | |
574 | ||
65396510 | 575 | return EXIT_SUCCESS; |
237e0016 | 576 | } |
a4deff3c RS |
577 | |
578 | #ifdef MAIL_USE_MAILLOCK | |
579 | /* This function uses stat to confirm that the mail directory is | |
580 | identical to the directory of the input file, rather than just | |
581 | string-comparing the two paths, because one or both of them might | |
582 | be symbolic links pointing to some other directory. */ | |
583 | static char * | |
728a982d | 584 | mail_spool_name (char *inname) |
a4deff3c RS |
585 | { |
586 | struct stat stat1, stat2; | |
587 | char *indir, *fname; | |
588 | int status; | |
589 | ||
8966b757 | 590 | if (! (fname = strrchr (inname, '/'))) |
a4deff3c RS |
591 | return NULL; |
592 | ||
593 | fname++; | |
594 | ||
595 | if (stat (MAILDIR, &stat1) < 0) | |
596 | return NULL; | |
597 | ||
e99a530f PE |
598 | indir = xmalloc (fname - inname + 1); |
599 | memcpy (indir, inname, fname - inname); | |
a4deff3c RS |
600 | indir[fname-inname] = '\0'; |
601 | ||
602 | ||
603 | status = stat (indir, &stat2); | |
604 | ||
605 | free (indir); | |
606 | ||
607 | if (status < 0) | |
608 | return NULL; | |
609 | ||
c4009c1f RS |
610 | if (stat1.st_dev == stat2.st_dev |
611 | && stat1.st_ino == stat2.st_ino) | |
a4deff3c RS |
612 | return fname; |
613 | ||
614 | return NULL; | |
615 | } | |
616 | #endif /* MAIL_USE_MAILLOCK */ | |
237e0016 RS |
617 | \f |
618 | /* Print error message and exit. */ | |
619 | ||
1725ae55 | 620 | static void |
988e88ab | 621 | fatal (const char *s1, const char *s2, const char *s3) |
237e0016 RS |
622 | { |
623 | if (delete_lockname) | |
624 | unlink (delete_lockname); | |
a9eedf40 | 625 | error (s1, s2, s3); |
65396510 | 626 | exit (EXIT_FAILURE); |
237e0016 RS |
627 | } |
628 | ||
cc3b64e8 DL |
629 | /* Print error message. `s1' is printf control string, `s2' and `s3' |
630 | are args for it or null. */ | |
237e0016 | 631 | |
1725ae55 | 632 | static void |
988e88ab | 633 | error (const char *s1, const char *s2, const char *s3) |
237e0016 | 634 | { |
e2f9d9af | 635 | fprintf (stderr, "movemail: "); |
cc3b64e8 DL |
636 | if (s3) |
637 | fprintf (stderr, s1, s2, s3); | |
638 | else if (s2) | |
639 | fprintf (stderr, s1, s2); | |
640 | else | |
3b3807f8 | 641 | fprintf (stderr, "%s", s1); |
e2f9d9af | 642 | fprintf (stderr, "\n"); |
237e0016 RS |
643 | } |
644 | ||
1725ae55 | 645 | static void |
873fbd0b | 646 | pfatal_with_name (char *name) |
237e0016 | 647 | { |
a9eedf40 | 648 | fatal ("%s for %s", strerror (errno), name); |
237e0016 RS |
649 | } |
650 | ||
1725ae55 | 651 | static void |
873fbd0b | 652 | pfatal_and_delete (char *name) |
cfa191ff | 653 | { |
a9eedf40 | 654 | char *s = strerror (errno); |
cfa191ff | 655 | unlink (name); |
a9eedf40 | 656 | fatal ("%s for %s", s, name); |
cfa191ff | 657 | } |
237e0016 RS |
658 | \f |
659 | /* This is the guts of the interface to the Post Office Protocol. */ | |
660 | ||
661 | #ifdef MAIL_USE_POP | |
662 | ||
7f75d5c6 | 663 | #ifndef WINDOWSNT |
237e0016 RS |
664 | #include <sys/socket.h> |
665 | #include <netinet/in.h> | |
666 | #include <netdb.h> | |
7f75d5c6 RS |
667 | #else |
668 | #undef _WINSOCKAPI_ | |
669 | #include <winsock.h> | |
670 | #endif | |
cecf0f21 | 671 | #include <pwd.h> |
d228a23c | 672 | #include <string.h> |
237e0016 | 673 | |
237e0016 RS |
674 | #define NOTOK (-1) |
675 | #define OK 0 | |
237e0016 | 676 | |
b23b5a5b | 677 | static char Errmsg[200]; /* POP errors, at least, can exceed |
752fb472 | 678 | the original length of 80. */ |
237e0016 | 679 | |
476b2799 | 680 | /* |
4d90eee4 | 681 | * The full valid syntax for a POP mailbox specification for movemail |
476b2799 GM |
682 | * is "po:username:hostname". The ":hostname" is optional; if it is |
683 | * omitted, the MAILHOST environment variable will be consulted. Note | |
684 | * that by the time popmail() is called the "po:" has been stripped | |
685 | * off of the front of the mailbox name. | |
686 | * | |
687 | * If the mailbox is in the form "po:username:hostname", then it is | |
688 | * modified by this function -- the second colon is replaced by a | |
689 | * null. | |
65396510 TTN |
690 | * |
691 | * Return a value suitable for passing to `exit'. | |
476b2799 GM |
692 | */ |
693 | ||
1725ae55 | 694 | static int |
873fbd0b | 695 | popmail (char *mailbox, char *outfile, int preserve, char *password, int reverse_order) |
237e0016 | 696 | { |
b1ce62a8 | 697 | int nmsgs, nbytes; |
b1ce62a8 RS |
698 | register int i; |
699 | int mbfi; | |
700 | FILE *mbf; | |
873fbd0b | 701 | char *getenv (const char *); |
b32701a7 | 702 | popserver server; |
a2997b0f | 703 | int start, end, increment; |
476b2799 GM |
704 | char *user, *hostname; |
705 | ||
706 | user = mailbox; | |
8966b757 | 707 | if ((hostname = strchr (mailbox, ':'))) |
476b2799 | 708 | *hostname++ = '\0'; |
237e0016 | 709 | |
476b2799 | 710 | server = pop_open (hostname, user, password, POP_NO_GETPASS); |
2e82e3c3 | 711 | if (! server) |
b1ce62a8 | 712 | { |
cc3b64e8 | 713 | error ("Error connecting to POP server: %s", pop_error, 0); |
65396510 | 714 | return EXIT_FAILURE; |
237e0016 RS |
715 | } |
716 | ||
2e82e3c3 | 717 | if (pop_stat (server, &nmsgs, &nbytes)) |
b1ce62a8 | 718 | { |
cc3b64e8 | 719 | error ("Error getting message count from POP server: %s", pop_error, 0); |
65396510 | 720 | return EXIT_FAILURE; |
237e0016 RS |
721 | } |
722 | ||
b1ce62a8 RS |
723 | if (!nmsgs) |
724 | { | |
2e82e3c3 | 725 | pop_close (server); |
65396510 | 726 | return EXIT_SUCCESS; |
b1ce62a8 RS |
727 | } |
728 | ||
729 | mbfi = open (outfile, O_WRONLY | O_CREAT | O_EXCL, 0666); | |
730 | if (mbfi < 0) | |
731 | { | |
2e82e3c3 RS |
732 | pop_close (server); |
733 | error ("Error in open: %s, %s", strerror (errno), outfile); | |
65396510 | 734 | return EXIT_FAILURE; |
b1ce62a8 | 735 | } |
f0939c31 PE |
736 | |
737 | if (fchown (mbfi, getuid (), -1) != 0) | |
738 | { | |
739 | int fchown_errno = errno; | |
740 | struct stat st; | |
741 | if (fstat (mbfi, &st) != 0 || st.st_uid != getuid ()) | |
742 | { | |
743 | pop_close (server); | |
744 | error ("Error in fchown: %s, %s", strerror (fchown_errno), outfile); | |
745 | return EXIT_FAILURE; | |
746 | } | |
747 | } | |
b1ce62a8 | 748 | |
7f75d5c6 | 749 | if ((mbf = fdopen (mbfi, "wb")) == NULL) |
b1ce62a8 | 750 | { |
2e82e3c3 | 751 | pop_close (server); |
cc3b64e8 | 752 | error ("Error in fdopen: %s", strerror (errno), 0); |
2e82e3c3 RS |
753 | close (mbfi); |
754 | unlink (outfile); | |
65396510 | 755 | return EXIT_FAILURE; |
b1ce62a8 RS |
756 | } |
757 | ||
a2997b0f KH |
758 | if (reverse_order) |
759 | { | |
760 | start = nmsgs; | |
761 | end = 1; | |
762 | increment = -1; | |
763 | } | |
764 | else | |
765 | { | |
766 | start = 1; | |
767 | end = nmsgs; | |
768 | increment = 1; | |
769 | } | |
770 | ||
771 | for (i = start; i * increment <= end * increment; i += increment) | |
b1ce62a8 RS |
772 | { |
773 | mbx_delimit_begin (mbf); | |
ff804ff5 | 774 | if (pop_retr (server, i, mbf) != OK) |
b1ce62a8 | 775 | { |
17a60964 | 776 | error ("%s", Errmsg, 0); |
b1ce62a8 | 777 | close (mbfi); |
65396510 | 778 | return EXIT_FAILURE; |
237e0016 | 779 | } |
b1ce62a8 RS |
780 | mbx_delimit_end (mbf); |
781 | fflush (mbf); | |
2e82e3c3 RS |
782 | if (ferror (mbf)) |
783 | { | |
cc3b64e8 | 784 | error ("Error in fflush: %s", strerror (errno), 0); |
2e82e3c3 RS |
785 | pop_close (server); |
786 | close (mbfi); | |
65396510 | 787 | return EXIT_FAILURE; |
2e82e3c3 | 788 | } |
237e0016 RS |
789 | } |
790 | ||
2e82e3c3 RS |
791 | /* On AFS, a call to write only modifies the file in the local |
792 | * workstation's AFS cache. The changes are not written to the server | |
793 | * until a call to fsync or close is made. Users with AFS home | |
794 | * directories have lost mail when over quota because these checks were | |
795 | * not made in previous versions of movemail. */ | |
796 | ||
e397a017 | 797 | #ifdef BSD_SYSTEM |
cfa191ff RS |
798 | if (fsync (mbfi) < 0) |
799 | { | |
08fa58c9 | 800 | error ("Error in fsync: %s", strerror (errno), 0); |
65396510 | 801 | return EXIT_FAILURE; |
cfa191ff | 802 | } |
340ff9de | 803 | #endif |
cfa191ff RS |
804 | |
805 | if (close (mbfi) == -1) | |
806 | { | |
cc3b64e8 | 807 | error ("Error in close: %s", strerror (errno), 0); |
65396510 | 808 | return EXIT_FAILURE; |
cfa191ff RS |
809 | } |
810 | ||
fea4325c RS |
811 | if (! preserve) |
812 | for (i = 1; i <= nmsgs; i++) | |
813 | { | |
814 | if (pop_delete (server, i)) | |
815 | { | |
cc3b64e8 | 816 | error ("Error from POP server: %s", pop_error, 0); |
fea4325c | 817 | pop_close (server); |
65396510 | 818 | return EXIT_FAILURE; |
fea4325c RS |
819 | } |
820 | } | |
237e0016 | 821 | |
2e82e3c3 | 822 | if (pop_quit (server)) |
b1ce62a8 | 823 | { |
cc3b64e8 | 824 | error ("Error from POP server: %s", pop_error, 0); |
65396510 | 825 | return EXIT_FAILURE; |
237e0016 | 826 | } |
177c0ea7 | 827 | |
65396510 | 828 | return EXIT_SUCCESS; |
237e0016 RS |
829 | } |
830 | ||
1725ae55 | 831 | static int |
873fbd0b | 832 | pop_retr (popserver server, int msgno, FILE *arg) |
237e0016 | 833 | { |
2e82e3c3 RS |
834 | char *line; |
835 | int ret; | |
237e0016 | 836 | |
2e82e3c3 | 837 | if (pop_retrieve_first (server, msgno, &line)) |
b1ce62a8 | 838 | { |
e99a530f | 839 | snprintf (Errmsg, sizeof Errmsg, "Error from POP server: %s", pop_error); |
2e82e3c3 | 840 | return (NOTOK); |
237e0016 RS |
841 | } |
842 | ||
d89d0243 | 843 | while ((ret = pop_retrieve_next (server, &line)) >= 0) |
b1ce62a8 | 844 | { |
2e82e3c3 RS |
845 | if (! line) |
846 | break; | |
847 | ||
d89d0243 | 848 | if (mbx_write (line, ret, arg) != OK) |
b1ce62a8 | 849 | { |
2e82e3c3 RS |
850 | strcpy (Errmsg, strerror (errno)); |
851 | pop_close (server); | |
852 | return (NOTOK); | |
237e0016 RS |
853 | } |
854 | } | |
237e0016 | 855 | |
2e82e3c3 | 856 | if (ret) |
b1ce62a8 | 857 | { |
e99a530f | 858 | snprintf (Errmsg, sizeof Errmsg, "Error from POP server: %s", pop_error); |
2e82e3c3 | 859 | return (NOTOK); |
237e0016 RS |
860 | } |
861 | ||
2e82e3c3 | 862 | return (OK); |
237e0016 RS |
863 | } |
864 | ||
1725ae55 | 865 | static int |
873fbd0b | 866 | mbx_write (char *line, int len, FILE *mbf) |
237e0016 | 867 | { |
d04f5031 | 868 | #ifdef MOVEMAIL_QUOTE_POP_FROM_LINES |
5ecec6a7 PE |
869 | /* Do this as a macro instead of using strcmp to save on execution time. */ |
870 | # define IS_FROM_LINE(a) ((a[0] == 'F') \ | |
871 | && (a[1] == 'r') \ | |
872 | && (a[2] == 'o') \ | |
873 | && (a[3] == 'm') \ | |
874 | && (a[4] == ' ')) | |
2e82e3c3 RS |
875 | if (IS_FROM_LINE (line)) |
876 | { | |
877 | if (fputc ('>', mbf) == EOF) | |
878 | return (NOTOK); | |
879 | } | |
d04f5031 PE |
880 | #endif |
881 | if (line[0] == '\037') | |
882 | { | |
883 | if (fputs ("^_", mbf) == EOF) | |
884 | return (NOTOK); | |
885 | line++; | |
886 | len--; | |
887 | } | |
177c0ea7 | 888 | if (fwrite (line, 1, len, mbf) != len) |
2e82e3c3 RS |
889 | return (NOTOK); |
890 | if (fputc (0x0a, mbf) == EOF) | |
891 | return (NOTOK); | |
892 | return (OK); | |
237e0016 RS |
893 | } |
894 | ||
1725ae55 | 895 | static int |
873fbd0b | 896 | mbx_delimit_begin (FILE *mbf) |
237e0016 | 897 | { |
d228a23c GM |
898 | time_t now; |
899 | struct tm *ltime; | |
900 | char fromline[40] = "From movemail "; | |
901 | ||
902 | now = time (NULL); | |
903 | ltime = localtime (&now); | |
904 | ||
905 | strcat (fromline, asctime (ltime)); | |
906 | ||
907 | if (fputs (fromline, mbf) == EOF) | |
2e82e3c3 RS |
908 | return (NOTOK); |
909 | return (OK); | |
237e0016 RS |
910 | } |
911 | ||
1725ae55 | 912 | static int |
873fbd0b | 913 | mbx_delimit_end (FILE *mbf) |
237e0016 | 914 | { |
3f32be22 | 915 | if (putc ('\n', mbf) == EOF) |
2e82e3c3 RS |
916 | return (NOTOK); |
917 | return (OK); | |
237e0016 RS |
918 | } |
919 | ||
920 | #endif /* MAIL_USE_POP */ |