1 /* ========================================================================
2 * Copyright 1988-2007 University of Washington
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 *
11 * ========================================================================
12 */
13
14 /*
15 * Program: MBX mail routines
16 *
17 * Author: Mark Crispin
18 * Networks and Distributed Computing
19 * Computing & Communications
20 * University of Washington
21 * Administration Building, AG-44
22 * Seattle, WA 98195
23 * Internet: MRC@CAC.Washington.EDU
24 *
25 * Date: 3 October 1995
26 * Last Edited: 11 October 2007
27 */
28
29
30 /* FILE TIME SEMANTICS
31 *
32 * The atime is the last read time of the file.
33 * The mtime is the last flags update time of the file.
34 * The ctime is the last write time of the file.
35 */
36
37 #include <stdio.h>
38 #include <ctype.h>
39 #include <errno.h>
40 extern int errno; /* just in case */
41 #include "mail.h"
42 #include "osdep.h"
43 #include <pwd.h>
44 #include <sys/stat.h>
45 #include <sys/time.h>
46 #include "misc.h"
47 #include "dummy.h"
48 #include "fdstring.h"
49
50
51 /* Build parameters */
52
53 #define HDRSIZE 2048
54
55
56 /* Kludge to make Cygwin happy */
57
58 #ifndef O_BINARY
59 #define O_BINARY 0
60 #endif
61
62 /* MBX I/O stream local data */
63
64 typedef struct mbx_local {
65 unsigned int flagcheck: 1; /* if ping should sweep for flags */
66 unsigned int expok: 1; /* if expunging OK in ping */
67 unsigned int expunged : 1; /* if one or more expunged messages */
68 int fd; /* file descriptor for I/O */
69 int ld; /* lock file descriptor */
70 int ffuserflag; /* first free user flag */
71 off_t filesize; /* file size parsed */
72 time_t filetime; /* last file time */
73 time_t lastsnarf; /* last snarf time */
74 unsigned long lastpid; /* PID of last writer */
75 unsigned char *buf; /* temporary buffer */
76 unsigned long buflen; /* current size of temporary buffer */
77 char lock[MAILTMPLEN]; /* buffer to write lock name */
78 } MBXLOCAL;
79
80
81 /* Convenient access to local data */
82
83 #define LOCAL ((MBXLOCAL *) stream->local)
84
85 /* Function prototypes */
86
87 DRIVER *mbx_valid (char *name);
88 int mbx_isvalid (MAILSTREAM **stream,char *name,char *tmp,int *ld,char *lock,
89 long flags);
90 void *mbx_parameters (long function,void *value);
91 void mbx_scan (MAILSTREAM *stream,char *ref,char *pat,char *contents);
92 void mbx_list (MAILSTREAM *stream,char *ref,char *pat);
93 void mbx_lsub (MAILSTREAM *stream,char *ref,char *pat);
94 long mbx_create (MAILSTREAM *stream,char *mailbox);
95 long mbx_delete (MAILSTREAM *stream,char *mailbox);
96 long mbx_rename (MAILSTREAM *stream,char *old,char *newname);
97 long mbx_status (MAILSTREAM *stream,char *mbx,long flags);
98 MAILSTREAM *mbx_open (MAILSTREAM *stream);
99 void mbx_close (MAILSTREAM *stream,long options);
100 void mbx_abort (MAILSTREAM *stream);
101 void mbx_flags (MAILSTREAM *stream,char *sequence,long flags);
102 char *mbx_header (MAILSTREAM *stream,unsigned long msgno,unsigned long *length,
103 long flags);
104 long mbx_text (MAILSTREAM *stream,unsigned long msgno,STRING *bs,long flags);
105 void mbx_flag (MAILSTREAM *stream,char *sequence,char *flag,long flags);
106 void mbx_flagmsg (MAILSTREAM *stream,MESSAGECACHE *elt);
107 long mbx_ping (MAILSTREAM *stream);
108 void mbx_check (MAILSTREAM *stream);
109 long mbx_expunge (MAILSTREAM *stream,char *sequence,long options);
110 void mbx_snarf (MAILSTREAM *stream);
111 long mbx_copy (MAILSTREAM *stream,char *sequence,char *mailbox,long options);
112 long mbx_append (MAILSTREAM *stream,char *mailbox,append_t af,void *data);
113
114 char *mbx_file (char *dst,char *name);
115 long mbx_parse (MAILSTREAM *stream);
116 MESSAGECACHE *mbx_elt (MAILSTREAM *stream,unsigned long msgno,long expok);
117 unsigned long mbx_read_flags (MAILSTREAM *stream,MESSAGECACHE *elt);
118 void mbx_update_header (MAILSTREAM *stream);
119 void mbx_update_status (MAILSTREAM *stream,unsigned long msgno,long flags);
120 unsigned long mbx_hdrpos (MAILSTREAM *stream,unsigned long msgno,
121 unsigned long *size,char **hdr);
122 unsigned long mbx_rewrite (MAILSTREAM *stream,unsigned long *reclaimed,
123 long flags);
124 long mbx_flaglock (MAILSTREAM *stream);
125
126 /* MBX mail routines */
127
128
129 /* Driver dispatch used by MAIL */
130
131 DRIVER mbxdriver = {
132 "mbx", /* driver name */
133 DR_LOCAL|DR_MAIL|DR_CRLF|DR_LOCKING,
134 /* driver flags */
135 (DRIVER *) NIL, /* next driver */
136 mbx_valid, /* mailbox is valid for us */
137 mbx_parameters, /* manipulate parameters */
138 mbx_scan, /* scan mailboxes */
139 mbx_list, /* list mailboxes */
140 mbx_lsub, /* list subscribed mailboxes */
141 NIL, /* subscribe to mailbox */
142 NIL, /* unsubscribe from mailbox */
143 mbx_create, /* create mailbox */
144 mbx_delete, /* delete mailbox */
145 mbx_rename, /* rename mailbox */
146 mbx_status, /* status of mailbox */
147 mbx_open, /* open mailbox */
148 mbx_close, /* close mailbox */
149 mbx_flags, /* fetch message "fast" attributes */
150 mbx_flags, /* fetch message flags */
151 NIL, /* fetch overview */
152 NIL, /* fetch message envelopes */
153 mbx_header, /* fetch message header */
154 mbx_text, /* fetch message body */
155 NIL, /* fetch partial message text */
156 NIL, /* unique identifier */
157 NIL, /* message number */
158 mbx_flag, /* modify flags */
159 mbx_flagmsg, /* per-message modify flags */
160 NIL, /* search for message based on criteria */
161 NIL, /* sort messages */
162 NIL, /* thread messages */
163 mbx_ping, /* ping mailbox to see if still alive */
164 mbx_check, /* check for new messages */
165 mbx_expunge, /* expunge deleted messages */
166 mbx_copy, /* copy messages to another mailbox */
167 mbx_append, /* append string message to mailbox */
168 NIL /* garbage collect stream */
169 };
170
171 /* prototype stream */
172 MAILSTREAM mbxproto = {&mbxdriver};
173
174 /* MBX mail validate mailbox
175 * Accepts: mailbox name
176 * Returns: our driver if name is valid, NIL otherwise
177 */
178
mbx_valid(char * name)179 DRIVER *mbx_valid (char *name)
180 {
181 char tmp[MAILTMPLEN];
182 int fd = mbx_isvalid (NIL,name,tmp,NIL,NIL,NIL);
183 if (fd < 0) return NIL;
184 close (fd); /* don't need the fd now */
185 return &mbxdriver;
186 }
187
188
189 /* MBX mail test for valid mailbox
190 * Accepts: returned stream with valid mailbox keywords
191 * mailbox name
192 * scratch buffer
193 * returned lock fd
194 * returned lock name
195 * RW flags or NIL for readonly
196 * Returns: file descriptor if valid, NIL otherwise
197 */
198
199 #define MBXISVALIDNOUID 0x1 /* RW, don't do UID action */
200 #define MBXISVALIDUID 0x2 /* RW, do UID action */
201
mbx_isvalid(MAILSTREAM ** stream,char * name,char * tmp,int * ld,char * lock,long flags)202 int mbx_isvalid (MAILSTREAM **stream,char *name,char *tmp,int *ld,char *lock,
203 long flags)
204 {
205 int fd,upd;
206 int ret = -1;
207 unsigned long i;
208 long j,k;
209 off_t pos;
210 char c,*s,*t,hdr[HDRSIZE];
211 struct stat sbuf;
212 time_t tp[2];
213 int error = EINVAL; /* assume invalid argument */
214 if (ld) *ld = -1; /* initially no lock */
215 if ((s = mbx_file (tmp,name)) && !stat (s,&sbuf) &&
216 ((fd = open (tmp,(flags ? O_RDWR : O_RDONLY)|O_BINARY,NIL)) >= 0)) {
217 error = -1; /* bogus format */
218 /* I love cretinous C compilers -- don't you? */
219 if (read (fd,hdr,HDRSIZE) == HDRSIZE)
220 if ((hdr[0] == '*') && (hdr[1] == 'm') && (hdr[2] == 'b') &&
221 (hdr[3] == 'x') && (hdr[4] == '*') && (hdr[5] == '\015') &&
222 (hdr[6] == '\012') && isxdigit (hdr[7]) && isxdigit (hdr[8]))
223 if (isxdigit (hdr[9]) && isxdigit (hdr[10]) && isxdigit (hdr[11]) &&
224 isxdigit (hdr[12]) && isxdigit (hdr[13]) && isxdigit (hdr[14]) &&
225 isxdigit (c = hdr[15]) && isxdigit (hdr[16]))
226 if (isxdigit (hdr[17]) && isxdigit (hdr[18]) &&
227 isxdigit (hdr[19]) && isxdigit (hdr[20]) &&
228 isxdigit (hdr[21]) && isxdigit (hdr[22]) &&
229 (hdr[23] == '\015') && (hdr[24] == '\012')) {
230 ret = fd; /* mbx format */
231
232 if (stream) { /* lock if making mini-stream */
233 if (flock (fd,LOCK_SH) ||
234 (flags && ((*ld = lockfd (fd,lock,LOCK_EX)) < 0))) ret = -1;
235 /* reread data now that locked */
236 else if (lseek (fd,0,L_SET) ||
237 (read (fd,hdr,HDRSIZE) != HDRSIZE)) ret = -1;
238 else {
239 *stream = (MAILSTREAM *) memset (fs_get (sizeof (MAILSTREAM)),
240 0,sizeof (MAILSTREAM));
241 hdr[15] = '\0'; /* tie off UIDVALIDITY */
242 (*stream)->uid_validity = strtoul (hdr+7,NIL,16);
243 hdr[15] = c; /* now get UIDLAST */
244 (*stream)->uid_last = strtoul (hdr+15,NIL,16);
245 /* parse user flags */
246 for (i = 0, s = hdr + 25;
247 (i < NUSERFLAGS) && (t = strchr (s,'\015')) && (t - s);
248 i++, s = t + 2) {
249 *t = '\0'; /* tie off flag */
250 if (strlen (s) <= MAXUSERFLAG)
251 (*stream)->user_flags[i] = cpystr (s);
252 }
253 /* make sure have true UIDLAST */
254 if (flags & MBXISVALIDUID) {
255 for (upd = NIL,pos = 2048, k = 0; pos < sbuf.st_size;
256 pos += (j + k)) {
257 /* read header for this message */
258 lseek (fd,pos,L_SET);
259 if ((j = read (fd,hdr,64)) >= 0) {
260 hdr[j] = '\0';
261 if ((s = strchr (hdr,'\015')) && (s[1] == '\012')) {
262 *s = '\0';
263 k = s + 2 - hdr;
264 if ((s = strchr (hdr,',')) &&
265 (j = strtol (s+1,&s,10)) && (*s == ';') &&
266 (s = strchr (s+1,'-'))) {
267 /* get UID if there is any */
268 i = strtoul (++s,&t,16);
269 if (!*t && (t == (s + 8)) &&
270 (i <= (*stream)->uid_last)) {
271 if (!i) {
272 lseek (fd,pos + s - hdr,L_SET);
273 sprintf (hdr,"%08lx",++(*stream)->uid_last);
274 write (fd,hdr,8);
275 upd = T;
276 }
277 continue;
278 }
279 }
280 }
281 ret = -1; /* error, give up */
282 *stream = mail_close (*stream);
283 pos = sbuf.st_size + 1;
284 j = k = 0;
285 }
286 }
287
288 if (upd) { /* need to update hdr with new UIDLAST? */
289 lseek (fd,15,L_SET);
290 sprintf (hdr,"%08lx",(*stream)->uid_last);
291 write (fd,hdr,8);
292 }
293 }
294 }
295 }
296 }
297 if (ret != fd) close (fd); /* close the file */
298 else lseek (fd,0,L_SET); /* else rewind to start */
299 /* \Marked status? */
300 if (sbuf.st_ctime > sbuf.st_atime) {
301 tp[0] = sbuf.st_atime; /* preserve atime and mtime */
302 tp[1] = sbuf.st_mtime;
303 utime (tmp,tp); /* set the times */
304 }
305 }
306 /* in case INBOX but not mbx format */
307 else if (((error = errno) == ENOENT) && !compare_cstring (name,"INBOX"))
308 error = -1;
309 if ((ret < 0) && ld && (*ld >= 0)) {
310 unlockfd (*ld,lock);
311 *ld = -1;
312 }
313 errno = error; /* return as last error */
314 return ret; /* return what we should */
315 }
316
317 /* MBX manipulate driver parameters
318 * Accepts: function code
319 * function-dependent value
320 * Returns: function-dependent return value
321 */
322
mbx_parameters(long function,void * value)323 void *mbx_parameters (long function,void *value)
324 {
325 void *ret = NIL;
326 switch ((int) function) {
327 case GET_INBOXPATH:
328 if (value) ret = mbx_file ((char *) value,"INBOX");
329 break;
330 case SET_ONETIMEEXPUNGEATPING:
331 if (value) ((MBXLOCAL *) ((MAILSTREAM *) value)->local)->expok = T;
332 case GET_ONETIMEEXPUNGEATPING:
333 if (value) ret = (void *)
334 (((MBXLOCAL *) ((MAILSTREAM *) value)->local)->expok ? VOIDT : NIL);
335 break;
336 }
337 return ret;
338 }
339
340
341 /* MBX mail scan mailboxes
342 * Accepts: mail stream
343 * reference
344 * pattern to search
345 * string to scan
346 */
347
mbx_scan(MAILSTREAM * stream,char * ref,char * pat,char * contents)348 void mbx_scan (MAILSTREAM *stream,char *ref,char *pat,char *contents)
349 {
350 if (stream) dummy_scan (NIL,ref,pat,contents);
351 }
352
353
354 /* MBX mail list mailboxes
355 * Accepts: mail stream
356 * reference
357 * pattern to search
358 */
359
mbx_list(MAILSTREAM * stream,char * ref,char * pat)360 void mbx_list (MAILSTREAM *stream,char *ref,char *pat)
361 {
362 if (stream) dummy_list (NIL,ref,pat);
363 }
364
365
366 /* MBX mail list subscribed mailboxes
367 * Accepts: mail stream
368 * reference
369 * pattern to search
370 */
371
mbx_lsub(MAILSTREAM * stream,char * ref,char * pat)372 void mbx_lsub (MAILSTREAM *stream,char *ref,char *pat)
373 {
374 if (stream) dummy_lsub (NIL,ref,pat);
375 }
376
377 /* MBX mail create mailbox
378 * Accepts: MAIL stream
379 * mailbox name to create
380 * Returns: T on success, NIL on failure
381 */
382
mbx_create(MAILSTREAM * stream,char * mailbox)383 long mbx_create (MAILSTREAM *stream,char *mailbox)
384 {
385 char *s,*t,mbx[MAILTMPLEN],tmp[HDRSIZE];
386 long ret = NIL;
387 int i,fd;
388 if (!(s = mbx_file (mbx,mailbox))) {
389 sprintf (mbx,"Can't create %.80s: invalid name",mailbox);
390 MM_LOG (mbx,ERROR);
391 }
392 /* create underlying file */
393 else if (dummy_create_path (stream,s,get_dir_protection (mailbox))) {
394 /* done if made directory */
395 if ((s = strrchr (s,'/')) && !s[1]) return T;
396 if ((fd = open (mbx,O_WRONLY|O_BINARY,NIL)) < 0) {
397 sprintf (tmp,"Can't reopen mailbox node %.80s: %s",mbx,strerror (errno));
398 MM_LOG (tmp,ERROR);
399 unlink (mbx); /* delete the file */
400 }
401 else {
402 memset (tmp,'\0',HDRSIZE);/* initialize header */
403 sprintf (s = tmp,"*mbx*\015\012%08lx00000000\015\012",
404 (unsigned long) time (0));
405 for (i = 0; i < NUSERFLAGS; ++i) {
406 t = (stream && stream->user_flags[i]) ? stream->user_flags[i] :
407 ((t = default_user_flag (i)) ? t : "");
408 sprintf (s += strlen (s),"%s\015\012",t);
409 }
410 if (write (fd,tmp,HDRSIZE) != HDRSIZE) {
411 sprintf (tmp,"Can't initialize mailbox node %.80s: %s",
412 mbx,strerror (errno));
413 MM_LOG (tmp,ERROR);
414 unlink (mbx); /* delete the file */
415 }
416 else ret = T; /* success */
417 close (fd); /* close file */
418 }
419 }
420 /* set proper protections */
421 return ret ? set_mbx_protections (mailbox,mbx) : NIL;
422 }
423
424
425 /* MBX mail delete mailbox
426 * Accepts: MAIL stream
427 * mailbox name to delete
428 * Returns: T on success, NIL on failure
429 */
430
mbx_delete(MAILSTREAM * stream,char * mailbox)431 long mbx_delete (MAILSTREAM *stream,char *mailbox)
432 {
433 return mbx_rename (stream,mailbox,NIL);
434 }
435
436 /* MBX mail rename mailbox
437 * Accepts: MAIL stream
438 * old mailbox name
439 * new mailbox name (or NIL for delete)
440 * Returns: T on success, NIL on failure
441 */
442
mbx_rename(MAILSTREAM * stream,char * old,char * newname)443 long mbx_rename (MAILSTREAM *stream,char *old,char *newname)
444 {
445 long ret = LONGT;
446 char c,*s,tmp[MAILTMPLEN],file[MAILTMPLEN],lock[MAILTMPLEN];
447 int fd,ld;
448 struct stat sbuf;
449 if (!mbx_file (file,old) ||
450 (newname && (!((s = mailboxfile (tmp,newname)) && *s) ||
451 ((s = strrchr (tmp,'/')) && !s[1])))) {
452 sprintf (tmp,newname ?
453 "Can't rename mailbox %.80s to %.80s: invalid name" :
454 "Can't delete mailbox %.80s: invalid name",
455 old,newname);
456 MM_LOG (tmp,ERROR);
457 return NIL;
458 }
459 else if ((fd = open (file,O_RDWR|O_BINARY,NIL)) < 0) {
460 sprintf (tmp,"Can't open mailbox %.80s: %s",old,strerror (errno));
461 MM_LOG (tmp,ERROR);
462 return NIL;
463 }
464 /* get parse/append permission */
465 if ((ld = lockfd (fd,lock,LOCK_EX)) < 0) {
466 MM_LOG ("Unable to lock rename mailbox",ERROR);
467 return NIL;
468 }
469 /* lock out other users */
470 if (flock (fd,LOCK_EX|LOCK_NB)) {
471 close (fd); /* couldn't lock, give up on it then */
472 sprintf (tmp,"Mailbox %.80s is in use by another process",old);
473 MM_LOG (tmp,ERROR);
474 unlockfd (ld,lock); /* release exclusive parse/append permission */
475 return NIL;
476 }
477
478 if (newname) { /* want rename? */
479 /* found superior to destination name? */
480 if (s = strrchr (tmp,'/')) {
481 c = *++s; /* remember first character of inferior */
482 *s = '\0'; /* tie off to get just superior */
483 /* superior name doesn't exist, create it */
484 if ((stat (tmp,&sbuf) || ((sbuf.st_mode & S_IFMT) != S_IFDIR)) &&
485 !dummy_create_path (stream,tmp,get_dir_protection (newname)))
486 ret = NIL;
487 else *s = c; /* restore full name */
488 }
489 /* rename the file */
490 if (ret && rename (file,tmp)) {
491 sprintf (tmp,"Can't rename mailbox %.80s to %.80s: %s",old,newname,
492 strerror (errno));
493 MM_LOG (tmp,ERROR);
494 ret = NIL; /* set failure */
495 }
496 }
497 else if (unlink (file)) {
498 sprintf (tmp,"Can't delete mailbox %.80s: %s",old,strerror (errno));
499 MM_LOG (tmp,ERROR);
500 ret = NIL; /* set failure */
501 }
502 flock (fd,LOCK_UN); /* release lock on the file */
503 unlockfd (ld,lock); /* release exclusive parse/append permission */
504 close (fd); /* close the file */
505 /* recreate file if renamed INBOX */
506 if (ret && !compare_cstring (old,"INBOX")) mbx_create (NIL,"INBOX");
507 return ret; /* return success */
508 }
509
510 /* MBX Mail status
511 * Accepts: mail stream
512 * mailbox name
513 * status flags
514 * Returns: T on success, NIL on failure
515 */
516
mbx_status(MAILSTREAM * stream,char * mbx,long flags)517 long mbx_status (MAILSTREAM *stream,char *mbx,long flags)
518 {
519 MAILSTATUS status;
520 unsigned long i;
521 MAILSTREAM *tstream = NIL;
522 MAILSTREAM *systream = NIL;
523 /* make temporary stream (unless this mbx) */
524 if (!stream && !(stream = tstream =
525 mail_open (NIL,mbx,OP_READONLY|OP_SILENT)))
526 return NIL;
527 status.flags = flags; /* return status values */
528 status.messages = stream->nmsgs;
529 status.recent = stream->recent;
530 if (flags & SA_UNSEEN) /* must search to get unseen messages */
531 for (i = 1,status.unseen = 0; i <= stream->nmsgs; i++)
532 if (!mail_elt (stream,i)->seen) status.unseen++;
533 status.uidnext = stream->uid_last + 1;
534 status.uidvalidity = stream->uid_validity;
535 /* calculate post-snarf results */
536 if (!status.recent && stream->inbox &&
537 (systream = mail_open (NIL,sysinbox (),OP_READONLY|OP_SILENT))) {
538 status.messages += systream->nmsgs;
539 status.recent += systream->recent;
540 if (flags & SA_UNSEEN) /* must search to get unseen messages */
541 for (i = 1; i <= systream->nmsgs; i++)
542 if (!mail_elt (systream,i)->seen) status.unseen++;
543 /* kludge but probably good enough */
544 status.uidnext += systream->nmsgs;
545 }
546 MM_STATUS(stream,mbx,&status);/* pass status to main program */
547 if (tstream) mail_close (tstream);
548 if (systream) mail_close (systream);
549 return T; /* success */
550 }
551
552 /* MBX mail open
553 * Accepts: stream to open
554 * Returns: stream on success, NIL on failure
555 */
556
mbx_open(MAILSTREAM * stream)557 MAILSTREAM *mbx_open (MAILSTREAM *stream)
558 {
559 int fd,ld;
560 short silent;
561 char tmp[MAILTMPLEN];
562 blocknotify_t bn = (blocknotify_t) mail_parameters (NIL,GET_BLOCKNOTIFY,NIL);
563 /* return prototype for OP_PROTOTYPE call */
564 if (!stream) return user_flags (&mbxproto);
565 if (stream->local) fatal ("mbx recycle stream");
566 /* canonicalize the mailbox name */
567 if (!mbx_file (tmp,stream->mailbox)) {
568 sprintf (tmp,"Can't open - invalid name: %.80s",stream->mailbox);
569 MM_LOG (tmp,ERROR);
570 }
571 if (stream->rdonly ||
572 (fd = open (tmp,O_RDWR|O_BINARY,NIL)) < 0) {
573 if ((fd = open (tmp,O_RDONLY|O_BINARY,NIL)) < 0) {
574 sprintf (tmp,"Can't open mailbox: %s",strerror (errno));
575 MM_LOG (tmp,ERROR);
576 return NIL;
577 }
578 else if (!stream->rdonly) { /* got it, but readonly */
579 MM_LOG ("Can't get write access to mailbox, access is readonly",WARN);
580 stream->rdonly = T;
581 }
582 }
583
584 stream->local = memset (fs_get (sizeof (MBXLOCAL)),NIL,sizeof (MBXLOCAL));
585 LOCAL->fd = fd; /* bind the file */
586 LOCAL->ld = -1; /* no flaglock */
587 LOCAL->buf = (char *) fs_get (CHUNKSIZE);
588 LOCAL->buflen = CHUNKSIZE - 1;
589 /* note if an INBOX or not */
590 stream->inbox = !compare_cstring (stream->mailbox,"INBOX");
591 fs_give ((void **) &stream->mailbox);
592 stream->mailbox = cpystr (tmp);
593 /* get parse/append permission */
594 if ((ld = lockfd (LOCAL->fd,tmp,LOCK_EX)) < 0) {
595 MM_LOG ("Unable to lock open mailbox",ERROR);
596 return NIL;
597 }
598 (*bn) (BLOCK_FILELOCK,NIL);
599 flock (LOCAL->fd,LOCK_SH); /* lock the file */
600 (*bn) (BLOCK_NONE,NIL);
601 unlockfd (ld,tmp); /* release shared parse permission */
602 LOCAL->filesize = HDRSIZE; /* initialize parsed file size */
603 /* time not set up yet */
604 LOCAL->lastsnarf = LOCAL->filetime = 0;
605 LOCAL->expok = LOCAL->flagcheck = NIL;
606 stream->sequence++; /* bump sequence number */
607 /* parse mailbox */
608 stream->nmsgs = stream->recent = 0;
609 silent = stream->silent; /* defer events */
610 stream->silent = T;
611 if (mbx_ping (stream) && !stream->nmsgs)
612 MM_LOG ("Mailbox is empty",(long) NIL);
613 stream->silent = silent; /* now notify upper level */
614 mail_exists (stream,stream->nmsgs);
615 mail_recent (stream,stream->recent);
616 if (!LOCAL) return NIL; /* failure if stream died */
617 stream->perm_seen = stream->perm_deleted = stream->perm_flagged =
618 stream->perm_answered = stream->perm_draft = stream->rdonly ? NIL : T;
619 stream->perm_user_flags = stream->rdonly ? NIL : 0xffffffff;
620 stream->kwd_create = (stream->user_flags[NUSERFLAGS-1] || stream->rdonly) ?
621 NIL : T; /* can we create new user flags? */
622 return stream; /* return stream to caller */
623 }
624
625 /* MBX mail close
626 * Accepts: MAIL stream
627 * close options
628 */
629
mbx_close(MAILSTREAM * stream,long options)630 void mbx_close (MAILSTREAM *stream,long options)
631 {
632 if (stream && LOCAL) { /* only if a file is open */
633 int silent = stream->silent;
634 stream->silent = T; /* note this stream is dying */
635 /* do an expunge if requested */
636 if (options & CL_EXPUNGE) mbx_expunge (stream,NIL,NIL);
637 else { /* otherwise do a checkpoint to purge */
638 LOCAL->expok = T; /* possible expunged messages */
639 mbx_ping (stream);
640 }
641 stream->silent = silent; /* restore previous status */
642 mbx_abort (stream);
643 }
644 }
645
646
647 /* MBX mail abort stream
648 * Accepts: MAIL stream
649 */
650
mbx_abort(MAILSTREAM * stream)651 void mbx_abort (MAILSTREAM *stream)
652 {
653 if (stream && LOCAL) { /* only if a file is open */
654 flock (LOCAL->fd,LOCK_UN); /* unlock local file */
655 close (LOCAL->fd); /* close the local file */
656 /* free local text buffer */
657 if (LOCAL->buf) fs_give ((void **) &LOCAL->buf);
658 /* nuke the local data */
659 fs_give ((void **) &stream->local);
660 stream->dtb = NIL; /* log out the DTB */
661 }
662 }
663
664
665 /* MBX mail fetch flags
666 * Accepts: MAIL stream
667 * sequence
668 * option flags
669 * Sniffs at file to see if some other process changed the flags
670 */
671
mbx_flags(MAILSTREAM * stream,char * sequence,long flags)672 void mbx_flags (MAILSTREAM *stream,char *sequence,long flags)
673 {
674 MESSAGECACHE *elt;
675 unsigned long i;
676 if (mbx_ping (stream) && /* ping mailbox, get new status for messages */
677 ((flags & FT_UID) ? mail_uid_sequence (stream,sequence) :
678 mail_sequence (stream,sequence)))
679 for (i = 1; i <= stream->nmsgs; i++)
680 if ((elt = mail_elt (stream,i))->sequence && !elt->valid)
681 mbx_elt (stream,i,NIL);
682 }
683
684 /* MBX mail fetch message header
685 * Accepts: MAIL stream
686 * message # to fetch
687 * pointer to returned header text length
688 * option flags
689 * Returns: message header in RFC822 format
690 */
691
mbx_header(MAILSTREAM * stream,unsigned long msgno,unsigned long * length,long flags)692 char *mbx_header (MAILSTREAM *stream,unsigned long msgno,unsigned long *length,
693 long flags)
694 {
695 unsigned long i;
696 char *s;
697 *length = 0; /* default to empty */
698 if (flags & FT_UID) return "";/* UID call "impossible" */
699 /* get header position, possibly header */
700 i = mbx_hdrpos (stream,msgno,length,&s);
701 if (!s) { /* mbx_hdrpos() returned header? */
702 lseek (LOCAL->fd,i,L_SET); /* no, get to header position */
703 /* is buffer big enough? */
704 if (*length > LOCAL->buflen) {
705 fs_give ((void **) &LOCAL->buf);
706 LOCAL->buf = (char *) fs_get ((LOCAL->buflen = *length) + 1);
707 }
708 /* slurp the data */
709 read (LOCAL->fd,s = LOCAL->buf,*length);
710 }
711 s[*length] = '\0'; /* tie off string */
712 return s;
713 }
714
715 /* MBX mail fetch message text (body only)
716 * Accepts: MAIL stream
717 * message # to fetch
718 * pointer to returned header text length
719 * option flags
720 * Returns: T on success, NIL on failure
721 */
722
mbx_text(MAILSTREAM * stream,unsigned long msgno,STRING * bs,long flags)723 long mbx_text (MAILSTREAM *stream,unsigned long msgno,STRING *bs,long flags)
724 {
725 FDDATA d;
726 unsigned long i,j;
727 MESSAGECACHE *elt;
728 /* UID call "impossible" */
729 if (flags & FT_UID) return NIL;
730 /* get message status */
731 elt = mbx_elt (stream,msgno,NIL);
732 /* if message not seen */
733 if (!(flags & FT_PEEK) && !elt->seen && mbx_flaglock (stream)) {
734 elt->seen = T; /* mark message as seen */
735 /* recalculate status */
736 mbx_update_status (stream,msgno,NIL);
737 MM_FLAGS (stream,msgno);
738 /* update flags */
739 mbx_flag (stream,NIL,NIL,NIL);
740 }
741 if (!LOCAL) return NIL; /* mbx_flaglock() could have aborted */
742 /* find header position */
743 i = mbx_hdrpos (stream,msgno,&j,NIL);
744 d.fd = LOCAL->fd; /* set up file descriptor */
745 d.pos = i + j;
746 d.chunk = LOCAL->buf; /* initial buffer chunk */
747 d.chunksize = CHUNKSIZE;
748 INIT (bs,fd_string,&d,elt->rfc822_size - j);
749 return LONGT; /* success */
750 }
751
752 /* MBX mail modify flags
753 * Accepts: MAIL stream
754 * sequence
755 * flag(s)
756 * option flags
757 * Unlocks flag lock
758 */
759
mbx_flag(MAILSTREAM * stream,char * sequence,char * flag,long flags)760 void mbx_flag (MAILSTREAM *stream,char *sequence,char *flag,long flags)
761 {
762 time_t tp[2];
763 struct stat sbuf;
764 unsigned long oldpid = LOCAL->lastpid;
765 /* make sure the update takes */
766 if (!stream->rdonly && LOCAL && (LOCAL->fd >= 0) && (LOCAL->ld >= 0)) {
767 fsync (LOCAL->fd);
768 fstat (LOCAL->fd,&sbuf); /* get current write time */
769 tp[1] = LOCAL->filetime = sbuf.st_mtime;
770 /* we are the last flag updater */
771 LOCAL->lastpid = (unsigned long) getpid ();
772 /* update header if needed */
773 if (((LOCAL->ffuserflag < NUSERFLAGS) &&
774 stream->user_flags[LOCAL->ffuserflag]) || (oldpid != LOCAL->lastpid))
775 mbx_update_header (stream);
776 tp[0] = time (0); /* make sure read comes after all that */
777 utime (stream->mailbox,tp);
778 }
779 if (LOCAL->ld >= 0) { /* unlock now */
780 unlockfd (LOCAL->ld,LOCAL->lock);
781 LOCAL->ld = -1;
782 }
783 }
784
785
786 /* MBX mail per-message modify flags
787 * Accepts: MAIL stream
788 * message cache element
789 */
790
mbx_flagmsg(MAILSTREAM * stream,MESSAGECACHE * elt)791 void mbx_flagmsg (MAILSTREAM *stream,MESSAGECACHE *elt)
792 {
793 if (mbx_flaglock (stream)) mbx_update_status (stream,elt->msgno,NIL);
794 }
795
796 /* MBX mail ping mailbox
797 * Accepts: MAIL stream
798 * Returns: T if stream still alive, NIL if not
799 */
800
mbx_ping(MAILSTREAM * stream)801 long mbx_ping (MAILSTREAM *stream)
802 {
803 unsigned long i,pos;
804 long ret = NIL;
805 int ld;
806 char lock[MAILTMPLEN];
807 MESSAGECACHE *elt;
808 struct stat sbuf;
809 if (stream && LOCAL) { /* only if stream already open */
810 int snarf = stream->inbox && !stream->rdonly;
811 ret = LONGT; /* assume OK */
812 fstat (LOCAL->fd,&sbuf); /* get current file poop */
813 /* allow expunge if permitted at ping */
814 if (mail_parameters (NIL,GET_EXPUNGEATPING,NIL)) LOCAL->expok = T;
815 /* if external modification */
816 if (LOCAL->filetime && (LOCAL->filetime < sbuf.st_mtime))
817 LOCAL->flagcheck = T; /* upgrade to flag checking */
818 /* new mail or flagcheck handling needed? */
819 if (((sbuf.st_size - LOCAL->filesize) || LOCAL->flagcheck ||
820 !stream->nmsgs || snarf) &&
821 ((ld = lockfd (LOCAL->fd,lock,LOCK_EX)) >= 0)) {
822 /* reparse header if not flagchecking */
823 if (!LOCAL->flagcheck) ret = mbx_parse (stream);
824 /* sweep mailbox for changed message status */
825 else if (ret = mbx_parse (stream)) {
826 unsigned long recent = 0;
827 LOCAL->filetime = sbuf.st_mtime;
828 for (i = 1; i <= stream->nmsgs; )
829 if (elt = mbx_elt (stream,i,LOCAL->expok)) {
830 if (elt->recent) ++recent;
831 ++i;
832 }
833 mail_recent (stream,recent);
834 LOCAL->flagcheck = NIL; /* got all the updates */
835 }
836 /* always reparse header at least */
837 if (ret && snarf) { /* snarf new messages if still OK */
838 mbx_snarf (stream);
839 /* parse snarfed messages */
840 ret = mbx_parse (stream);
841 }
842 unlockfd (ld,lock); /* release shared parse/append permission */
843 }
844 if (ret) { /* must still be alive */
845 if (!LOCAL->expunged) /* look for holes if none known yet */
846 for (i = 1, pos = HDRSIZE;
847 !LOCAL->expunged && (i <= stream->nmsgs);
848 i++, pos += elt->private.special.text.size + elt->rfc822_size)
849 if ((elt = mail_elt (stream,i))->private.special.offset != pos)
850 LOCAL->expunged = T;/* found a hole */
851 /* burp any holes */
852 if (LOCAL->expunged && !stream->rdonly) {
853 if (mbx_rewrite (stream,&i,NIL)) fatal ("expunge on check");
854 if (i) { /* any space reclaimed? */
855 LOCAL->expunged = NIL;/* no more pending expunge */
856 sprintf (LOCAL->buf,"Reclaimed %lu bytes of expunged space",i);
857 MM_LOG (LOCAL->buf,(long) NIL);
858 }
859 }
860 LOCAL->expok = NIL; /* no more expok */
861 }
862 }
863 return ret; /* return result of the parse */
864 }
865
866 /* MBX mail check mailbox (reparses status too)
867 * Accepts: MAIL stream
868 */
869
mbx_check(MAILSTREAM * stream)870 void mbx_check (MAILSTREAM *stream)
871 {
872 if (LOCAL) LOCAL->expok = T; /* mark that a check is desired */
873 if (mbx_ping (stream)) MM_LOG ("Check completed",(long) NIL);
874 }
875
876
877 /* MBX mail expunge mailbox
878 * Accepts: MAIL stream
879 * sequence to expunge if non-NIL
880 * expunge options
881 * Returns: T if success, NIL if failure
882 */
883
mbx_expunge(MAILSTREAM * stream,char * sequence,long options)884 long mbx_expunge (MAILSTREAM *stream,char *sequence,long options)
885 {
886 long ret;
887 unsigned long nexp,reclaimed;
888 if (ret = sequence ? ((options & EX_UID) ?
889 mail_uid_sequence (stream,sequence) :
890 mail_sequence (stream,sequence)) : LONGT) {
891 if (!mbx_ping (stream)); /* do nothing if stream dead */
892 else if (stream->rdonly) /* won't do on readonly files! */
893 MM_LOG ("Expunge ignored on readonly mailbox",WARN);
894 /* if expunged any messages */
895 else if (nexp = mbx_rewrite (stream,&reclaimed,sequence ? -1 : 1)) {
896 sprintf (LOCAL->buf,"Expunged %lu messages",nexp);
897 MM_LOG (LOCAL->buf,(long) NIL);
898 }
899 else if (reclaimed) { /* or if any prior expunged space reclaimed */
900 sprintf (LOCAL->buf,"Reclaimed %lu bytes of expunged space",reclaimed);
901 MM_LOG (LOCAL->buf,(long) NIL);
902 }
903 else MM_LOG ("No messages deleted, so no update needed",(long) NIL);
904 }
905 return ret;
906 }
907
908 /* MBX mail snarf messages from system inbox
909 * Accepts: MAIL stream, already locked
910 */
911
mbx_snarf(MAILSTREAM * stream)912 void mbx_snarf (MAILSTREAM *stream)
913 {
914 unsigned long i = 0;
915 unsigned long j,r,hdrlen,txtlen;
916 struct stat sbuf;
917 char *hdr,*txt,tmp[MAILTMPLEN];
918 MESSAGECACHE *elt;
919 MAILSTREAM *sysibx = NIL;
920 /* give up if can't get exclusive permission */
921 if ((time (0) >= (LOCAL->lastsnarf +
922 (long) mail_parameters (NIL,GET_SNARFINTERVAL,NIL))) &&
923 strcmp (sysinbox (),stream->mailbox)) {
924 MM_CRITICAL (stream); /* go critical */
925 /* sizes match and anything in sysinbox? */
926 if (!stat (sysinbox (),&sbuf) && sbuf.st_size &&
927 !fstat (LOCAL->fd,&sbuf) && (sbuf.st_size == LOCAL->filesize) &&
928 (sysibx = mail_open (sysibx,sysinbox (),OP_SILENT)) &&
929 (!sysibx->rdonly) && (r = sysibx->nmsgs)) {
930 /* yes, go to end of file in our mailbox */
931 lseek (LOCAL->fd,sbuf.st_size,L_SET);
932 /* for each message in sysibx mailbox */
933 while (r && (++i <= sysibx->nmsgs)) {
934 /* snarf message from system INBOX */
935 hdr = cpystr (mail_fetchheader_full (sysibx,i,NIL,&hdrlen,NIL));
936 txt = mail_fetchtext_full (sysibx,i,&txtlen,FT_PEEK);
937 /* if have a message */
938 if (j = hdrlen + txtlen) {
939 /* build header line */
940 mail_date (LOCAL->buf,elt = mail_elt (sysibx,i));
941 sprintf (LOCAL->buf + strlen (LOCAL->buf),
942 ",%lu;00000000%04x-00000000\015\012",j,(unsigned)
943 ((fSEEN * elt->seen) +
944 (fDELETED * elt->deleted) + (fFLAGGED * elt->flagged) +
945 (fANSWERED * elt->answered) + (fDRAFT * elt->draft)));
946 /* copy message */
947 if ((write (LOCAL->fd,LOCAL->buf,strlen (LOCAL->buf)) < 0) ||
948 (write (LOCAL->fd,hdr,hdrlen) < 0) ||
949 (write (LOCAL->fd,txt,txtlen) < 0)) r = 0;
950 }
951 fs_give ((void **) &hdr);
952 }
953
954 /* make sure all the updates take */
955 if (fsync (LOCAL->fd)) r = 0;
956 if (r) { /* delete all the messages we copied */
957 if (r == 1) strcpy (tmp,"1");
958 else sprintf (tmp,"1:%lu",r);
959 mail_setflag (sysibx,tmp,"\\Deleted");
960 mail_expunge (sysibx); /* now expunge all those messages */
961 }
962 else {
963 sprintf (LOCAL->buf,"Can't copy new mail: %s",strerror (errno));
964 MM_LOG (LOCAL->buf,WARN);
965 ftruncate (LOCAL->fd,sbuf.st_size);
966 }
967 fstat (LOCAL->fd,&sbuf); /* yes, get current file size */
968 LOCAL->filetime = sbuf.st_mtime;
969 }
970 if (sysibx) mail_close (sysibx);
971 MM_NOCRITICAL (stream); /* release critical */
972 LOCAL->lastsnarf = time (0);/* note time of last snarf */
973 }
974 }
975
976 /* MBX mail copy message(s)
977 * Accepts: MAIL stream
978 * sequence
979 * destination mailbox
980 * copy options
981 * Returns: T if success, NIL if failed
982 */
983
mbx_copy(MAILSTREAM * stream,char * sequence,char * mailbox,long options)984 long mbx_copy (MAILSTREAM *stream,char *sequence,char *mailbox,long options)
985 {
986 struct stat sbuf;
987 time_t tp[2];
988 MESSAGECACHE *elt;
989 unsigned long i,j,k,m;
990 long ret = LONGT;
991 int fd,ld;
992 char *s,*t,file[MAILTMPLEN],lock[MAILTMPLEN];
993 mailproxycopy_t pc =
994 (mailproxycopy_t) mail_parameters (stream,GET_MAILPROXYCOPY,NIL);
995 copyuid_t cu = (copyuid_t) mail_parameters (NIL,GET_COPYUID,NIL);
996 SEARCHSET *source = cu ? mail_newsearchset () : NIL;
997 SEARCHSET *dest = cu ? mail_newsearchset () : NIL;
998 MAILSTREAM *dstream = NIL;
999 if (!((options & CP_UID) ? mail_uid_sequence (stream,sequence) :
1000 mail_sequence (stream,sequence))) return NIL;
1001 /* make sure valid mailbox */
1002 if ((fd = mbx_isvalid (&dstream,mailbox,file,&ld,lock,
1003 cu ? MBXISVALIDUID : MBXISVALIDNOUID)) < 0)
1004 switch (errno) {
1005 case ENOENT: /* no such file? */
1006 MM_NOTIFY (stream,"[TRYCREATE] Must create mailbox before copy",NIL);
1007 return NIL;
1008 case EACCES: /* file protected */
1009 sprintf (LOCAL->buf,"Can't access destination: %.80s",mailbox);
1010 MM_LOG (LOCAL->buf,ERROR);
1011 return NIL;
1012 case EINVAL:
1013 if (pc) return (*pc) (stream,sequence,mailbox,options);
1014 sprintf (LOCAL->buf,"Invalid MBX-format mailbox name: %.80s",mailbox);
1015 MM_LOG (LOCAL->buf,ERROR);
1016 return NIL;
1017 default:
1018 if (pc) return (*pc) (stream,sequence,mailbox,options);
1019 sprintf (LOCAL->buf,"Not a MBX-format mailbox: %.80s",mailbox);
1020 MM_LOG (LOCAL->buf,ERROR);
1021 return NIL;
1022 }
1023 MM_CRITICAL (stream); /* go critical */
1024 fstat (fd,&sbuf); /* get current file size */
1025 lseek (fd,sbuf.st_size,L_SET);/* move to end of file */
1026
1027 /* for each requested message */
1028 for (i = 1; ret && (i <= stream->nmsgs); i++)
1029 if ((elt = mail_elt (stream,i))->sequence) {
1030 lseek (LOCAL->fd,elt->private.special.offset +
1031 elt->private.special.text.size,L_SET);
1032 mail_date(LOCAL->buf,elt);/* build target header */
1033 /* get target keyword mask */
1034 for (j = elt->user_flags, k = 0; j; )
1035 if (s = stream->user_flags[find_rightmost_bit (&j)])
1036 for (m = 0; (m < NUSERFLAGS) && (t = dstream->user_flags[m]); m++)
1037 if (!compare_cstring (s,t) && (k |= 1 << m)) break;
1038 sprintf (LOCAL->buf+strlen(LOCAL->buf),",%lu;%08lx%04x-%08lx\015\012",
1039 elt->rfc822_size,k,(unsigned)
1040 ((fSEEN * elt->seen) + (fDELETED * elt->deleted) +
1041 (fFLAGGED * elt->flagged) + (fANSWERED * elt->answered) +
1042 (fDRAFT * elt->draft)),cu ? ++dstream->uid_last : 0);
1043 /* write target header */
1044 if (ret = (write (fd,LOCAL->buf,strlen (LOCAL->buf)) > 0)) {
1045 for (k = elt->rfc822_size; ret && (j = min (k,LOCAL->buflen)); k -= j){
1046 read (LOCAL->fd,LOCAL->buf,j);
1047 ret = write (fd,LOCAL->buf,j) >= 0;
1048 }
1049 if (cu) { /* need to pass back new UID? */
1050 mail_append_set (source,mail_uid (stream,i));
1051 mail_append_set (dest,dstream->uid_last);
1052 }
1053 }
1054 }
1055
1056 /* make sure all the updates take */
1057 if (!(ret && (ret = !fsync (fd)))) {
1058 sprintf (LOCAL->buf,"Unable to write message: %s",strerror (errno));
1059 MM_LOG (LOCAL->buf,ERROR);
1060 ftruncate (fd,sbuf.st_size);
1061 }
1062 if (cu && ret) { /* return sets if doing COPYUID */
1063 (*cu) (stream,mailbox,dstream->uid_validity,source,dest);
1064 lseek (fd,15,L_SET); /* update UIDLAST */
1065 sprintf (LOCAL->buf,"%08lx",dstream->uid_last);
1066 write (fd,LOCAL->buf,8);
1067 }
1068 else { /* flush any sets we may have built */
1069 mail_free_searchset (&source);
1070 mail_free_searchset (&dest);
1071 }
1072 if (ret) tp[0] = time (0) - 1;/* set atime to now-1 if successful copy */
1073 /* else preserve \Marked status */
1074 else tp[0] = (sbuf.st_ctime > sbuf.st_atime) ? sbuf.st_atime : time(0);
1075 tp[1] = sbuf.st_mtime; /* preserve mtime */
1076 utime (file,tp); /* set the times */
1077 close (fd); /* close the file */
1078 MM_NOCRITICAL (stream); /* release critical */
1079 unlockfd (ld,lock); /* release exclusive parse/append permission */
1080 /* delete all requested messages */
1081 if (ret && (options & CP_MOVE) && mbx_flaglock (stream)) {
1082 for (i = 1; i <= stream->nmsgs; i++) if (mail_elt (stream,i)->sequence) {
1083 /* mark message deleted */
1084 mbx_elt (stream,i,NIL)->deleted = T;
1085 /* recalculate status */
1086 mbx_update_status (stream,i,NIL);
1087 }
1088 /* update flags */
1089 mbx_flag (stream,NIL,NIL,NIL);
1090 }
1091 if (dstream != stream) mail_close (dstream);
1092 return ret;
1093 }
1094
1095 /* MBX mail append message from stringstruct
1096 * Accepts: MAIL stream
1097 * destination mailbox
1098 * append callback
1099 * data for callback
1100 * Returns: T if append successful, else NIL
1101 */
1102
mbx_append(MAILSTREAM * stream,char * mailbox,append_t af,void * data)1103 long mbx_append (MAILSTREAM *stream,char *mailbox,append_t af,void *data)
1104 {
1105 struct stat sbuf;
1106 int fd,ld;
1107 char *flags,*date,tmp[MAILTMPLEN],file[MAILTMPLEN],lock[MAILTMPLEN];
1108 time_t tp[2];
1109 FILE *df;
1110 MESSAGECACHE elt;
1111 long f;
1112 unsigned long i,uf;
1113 STRING *message;
1114 long ret = NIL;
1115 MAILSTREAM *dstream = NIL;
1116 appenduid_t au = (appenduid_t) mail_parameters (NIL,GET_APPENDUID,NIL);
1117 SEARCHSET *dst = au ? mail_newsearchset () : NIL;
1118 /* make sure valid mailbox */
1119 if ((fd = mbx_isvalid (&dstream,mailbox,file,&ld,lock,
1120 au ? MBXISVALIDUID : MBXISVALIDNOUID)) < 0)
1121 switch (errno) {
1122 case ENOENT: /* no such file? */
1123 if (compare_cstring (mailbox,"INBOX")) {
1124 MM_NOTIFY (stream,"[TRYCREATE] Must create mailbox before append",NIL);
1125 return NIL;
1126 }
1127 /* can create INBOX here */
1128 mbx_create (dstream = stream ? stream : user_flags (&mbxproto),"INBOX");
1129 if ((fd = mbx_isvalid (&dstream,mailbox,file,&ld,lock,
1130 au ? MBXISVALIDUID : MBXISVALIDNOUID)) >= 0)
1131 break;
1132 case EACCES: /* file protected */
1133 sprintf (tmp,"Can't access destination: %.80s",mailbox);
1134 MM_LOG (tmp,ERROR);
1135 return NIL;
1136 case EINVAL:
1137 sprintf (tmp,"Invalid MBX-format mailbox name: %.80s",mailbox);
1138 MM_LOG (tmp,ERROR);
1139 return NIL;
1140 default:
1141 sprintf (tmp,"Not a MBX-format mailbox: %.80s",mailbox);
1142 MM_LOG (tmp,ERROR);
1143 return NIL;
1144 }
1145
1146 /* get first message */
1147 if (!MM_APPEND (af) (dstream,data,&flags,&date,&message)) close (fd);
1148 else if (!(df = fdopen (fd,"r+b"))) {
1149 MM_LOG ("Unable to reopen append mailbox",ERROR);
1150 close (fd);
1151 }
1152 else {
1153 MM_CRITICAL (dstream); /* go critical */
1154 fstat (fd,&sbuf); /* get current file size */
1155 fseek (df,sbuf.st_size,SEEK_SET);
1156 errno = 0;
1157 for (ret = LONGT; ret && message; ) {
1158 if (!SIZE (message)) { /* guard against zero-length */
1159 MM_LOG ("Append of zero-length message",ERROR);
1160 ret = NIL;
1161 break;
1162 }
1163 f = mail_parse_flags (dstream,flags,&uf);
1164 if (date) { /* parse date if given */
1165 if (!mail_parse_date (&elt,date)) {
1166 sprintf (tmp,"Bad date in append: %.80s",date);
1167 MM_LOG (tmp,ERROR);
1168 ret = NIL; /* mark failure */
1169 break;
1170 }
1171 mail_date (tmp,&elt); /* write preseved date */
1172 }
1173 else internal_date (tmp); /* get current date in IMAP format */
1174 /* write header */
1175 if (fprintf (df,"%s,%lu;%08lx%04lx-%08lx\015\012",tmp,i = SIZE (message),
1176 uf,(unsigned long) f,au ? ++dstream->uid_last : 0) < 0)
1177 ret = NIL;
1178 else { /* write message */
1179 size_t j;
1180 if (!message->cursize) SETPOS (message,GETPOS (message));
1181 while (i && (j = fwrite (message->curpos,1,message->cursize,df))) {
1182 i -= j;
1183 SETPOS (message,GETPOS (message) + j);
1184 }
1185 /* get next message */
1186 if (i || !MM_APPEND (af) (dstream,data,&flags,&date,&message))
1187 ret = NIL;
1188 else if (au) mail_append_set (dst,dstream->uid_last);
1189 }
1190 }
1191
1192 /* if error... */
1193 if (!ret || (fflush (df) == EOF)) {
1194 /* revert file */
1195 ftruncate (fd,sbuf.st_size);
1196 close (fd); /* make sure fclose() doesn't corrupt us */
1197 if (errno) {
1198 sprintf (tmp,"Message append failed: %s",strerror (errno));
1199 MM_LOG (tmp,ERROR);
1200 }
1201 ret = NIL;
1202 }
1203 if (au && ret) { /* return sets if doing APPENDUID */
1204 (*au) (mailbox,dstream->uid_validity,dst);
1205 fseek (df,15,SEEK_SET); /* update UIDLAST */
1206 fprintf (df,"%08lx",dstream->uid_last);
1207 }
1208 else mail_free_searchset (&dst);
1209 /* set atime to now-1 if successful copy */
1210 if (ret) tp[0] = time (0) - 1;
1211 /* else preserve \Marked status */
1212 else tp[0] = (sbuf.st_ctime > sbuf.st_atime) ? sbuf.st_atime : time(0);
1213 tp[1] = sbuf.st_mtime; /* preserve mtime */
1214 utime (file,tp); /* set the times */
1215 fclose (df); /* close the file */
1216 MM_NOCRITICAL (dstream); /* release critical */
1217 }
1218 unlockfd (ld,lock); /* release exclusive parse/append permission */
1219 if (dstream != stream) mail_close (dstream);
1220 return ret;
1221 }
1222
1223 /* Internal routines */
1224
1225
1226 /* MBX mail generate file string
1227 * Accepts: temporary buffer to write into
1228 * mailbox name string
1229 * Returns: local file string or NIL if failure
1230 */
1231
mbx_file(char * dst,char * name)1232 char *mbx_file (char *dst,char *name)
1233 {
1234 char *s = mailboxfile (dst,name);
1235 return (s && !*s) ? mailboxfile (dst,"~/INBOX") : s;
1236 }
1237
1238 /* MBX mail parse mailbox
1239 * Accepts: MAIL stream
1240 * Returns: T if parse OK
1241 * NIL if failure, stream aborted
1242 */
1243
mbx_parse(MAILSTREAM * stream)1244 long mbx_parse (MAILSTREAM *stream)
1245 {
1246 struct stat sbuf;
1247 MESSAGECACHE *elt = NIL;
1248 unsigned char c,*s,*t,*x;
1249 char tmp[MAILTMPLEN];
1250 unsigned long i,j,k,m;
1251 off_t curpos = LOCAL->filesize;
1252 unsigned long nmsgs = stream->nmsgs;
1253 unsigned long recent = stream->recent;
1254 unsigned long lastuid = 0;
1255 short dirty = NIL;
1256 short added = NIL;
1257 short silent = stream->silent;
1258 short uidwarn = T;
1259 fstat (LOCAL->fd,&sbuf); /* get status */
1260 if (sbuf.st_size < curpos) { /* sanity check */
1261 sprintf (tmp,"Mailbox shrank from %lu to %lu!",
1262 (unsigned long) curpos,(unsigned long) sbuf.st_size);
1263 MM_LOG (tmp,ERROR);
1264 mbx_abort (stream);
1265 return NIL;
1266 }
1267 lseek (LOCAL->fd,0,L_SET); /* rewind file */
1268 /* read internal header */
1269 read (LOCAL->fd,LOCAL->buf,HDRSIZE);
1270 LOCAL->buf[HDRSIZE] = '\0'; /* tie off header */
1271 c = LOCAL->buf[15]; /* save first character of last UID */
1272 LOCAL->buf[15] = '\0';
1273 /* parse UID validity */
1274 stream->uid_validity = strtoul (LOCAL->buf + 7,NIL,16);
1275 LOCAL->buf[15] = c; /* restore first character of last UID */
1276 /* parse last UID */
1277 i = strtoul (LOCAL->buf + 15,NIL,16);
1278 stream->uid_last = stream->rdonly ? max (i,stream->uid_last) : i;
1279 /* parse user flags */
1280 for (i = 0, s = LOCAL->buf + 25;
1281 (i < NUSERFLAGS) && (t = strchr (s,'\015')) && (t - s);
1282 i++, s = t + 2) {
1283 *t = '\0'; /* tie off flag */
1284 if (!stream->user_flags[i] && (strlen (s) <= MAXUSERFLAG))
1285 stream->user_flags[i] = cpystr (s);
1286 }
1287 LOCAL->ffuserflag = (int) i; /* first free user flag */
1288
1289 /* get current last flag updater PID */
1290 i = (isxdigit (LOCAL->buf[HDRSIZE-10]) && isxdigit (LOCAL->buf[HDRSIZE-9]) &&
1291 isxdigit (LOCAL->buf[HDRSIZE-8]) && isxdigit (LOCAL->buf[HDRSIZE-7]) &&
1292 isxdigit (LOCAL->buf[HDRSIZE-6]) && isxdigit (LOCAL->buf[HDRSIZE-5]) &&
1293 isxdigit (LOCAL->buf[HDRSIZE-4]) && isxdigit (LOCAL->buf[HDRSIZE-3]) &&
1294 (LOCAL->buf[HDRSIZE-2] == '\015') && (LOCAL->buf[HDRSIZE-1] == '\012'))?
1295 strtoul (LOCAL->buf + HDRSIZE - 8,NIL,16) : 0;
1296 /* set flagcheck if lastpid changed */
1297 if (LOCAL->lastpid && (LOCAL->lastpid != i)) LOCAL->flagcheck = T;
1298 LOCAL->lastpid = i; /* set as last PID */
1299 stream->silent = T; /* don't pass up exists events yet */
1300 while (sbuf.st_size - curpos){/* while there is stuff to parse */
1301 /* get to that position in the file */
1302 lseek (LOCAL->fd,curpos,L_SET);
1303 if ((i = read (LOCAL->fd,LOCAL->buf,64)) <= 0) {
1304 sprintf (tmp,"Unable to read internal header at %lu, size = %lu: %s",
1305 (unsigned long) curpos,(unsigned long) sbuf.st_size,
1306 i ? strerror (errno) : "no data read");
1307 MM_LOG (tmp,ERROR);
1308 mbx_abort (stream);
1309 return NIL;
1310 }
1311 LOCAL->buf[i] = '\0'; /* tie off buffer just in case */
1312 if (!((s = strchr (LOCAL->buf,'\015')) && (s[1] == '\012'))) {
1313 sprintf (tmp,"Unable to find CRLF at %lu in %lu bytes, text: %.80s",
1314 (unsigned long) curpos,i,(char *) LOCAL->buf);
1315 MM_LOG (tmp,ERROR);
1316 mbx_abort (stream);
1317 return NIL;
1318 }
1319 *s = '\0'; /* tie off header line */
1320 i = (s + 2) - LOCAL->buf; /* note start of text offset */
1321 if (!((s = strchr (LOCAL->buf,',')) && (t = strchr (s+1,';')))) {
1322 sprintf (tmp,"Unable to parse internal header at %lu: %.80s",
1323 (unsigned long) curpos,(char *) LOCAL->buf);
1324 MM_LOG (tmp,ERROR);
1325 mbx_abort (stream);
1326 return NIL;
1327 }
1328 if (!(isxdigit (t[1]) && isxdigit (t[2]) && isxdigit (t[3]) &&
1329 isxdigit (t[4]) && isxdigit (t[5]) && isxdigit (t[6]) &&
1330 isxdigit (t[7]) && isxdigit (t[8]) && isxdigit (t[9]) &&
1331 isxdigit (t[10]) && isxdigit (t[11]) && isxdigit (t[12]))) {
1332 sprintf (tmp,"Unable to parse message flags at %lu: %.80s",
1333 (unsigned long) curpos,(char *) LOCAL->buf);
1334 MM_LOG (tmp,ERROR);
1335 mbx_abort (stream);
1336 return NIL;
1337 }
1338 if ((t[13] != '-') || t[22] ||
1339 !(isxdigit (t[14]) && isxdigit (t[15]) && isxdigit (t[16]) &&
1340 isxdigit (t[17]) && isxdigit (t[18]) && isxdigit (t[19]) &&
1341 isxdigit (t[20]) && isxdigit (t[21]))) {
1342 sprintf (tmp,"Unable to parse message UID at %lu: %.80s",
1343 (unsigned long) curpos,(char *) LOCAL->buf);
1344 MM_LOG (tmp,ERROR);
1345 mbx_abort (stream);
1346 return NIL;
1347 }
1348
1349 *s++ = '\0'; *t++ = '\0'; /* break up fields */
1350 /* get message size */
1351 if (!(j = strtoul (s,(char **) &x,10)) && (!(x && *x))) {
1352 sprintf (tmp,"Unable to parse message size at %lu: %.80s,%.80s;%.80s",
1353 (unsigned long) curpos,(char *) LOCAL->buf,(char *) s,
1354 (char *) t);
1355 MM_LOG (tmp,ERROR);
1356 mbx_abort (stream);
1357 return NIL;
1358 }
1359 /* make sure didn't run off end of file */
1360 if (((off_t) (curpos + i + j)) > sbuf.st_size) {
1361 sprintf (tmp,"Last message (at %lu) runs past end of file (%lu > %lu)",
1362 (unsigned long) curpos,(unsigned long) (curpos + i + j),
1363 (unsigned long) sbuf.st_size);
1364 MM_LOG (tmp,ERROR);
1365 mbx_abort (stream);
1366 return NIL;
1367 }
1368 /* parse UID */
1369 if ((m = strtoul (t+13,NIL,16)) &&
1370 ((m <= lastuid) || (m > stream->uid_last))) {
1371 if (uidwarn) {
1372 sprintf (tmp,"Invalid UID %08lx in message %lu, rebuilding UIDs",
1373 m,nmsgs+1);
1374 MM_LOG (tmp,WARN);
1375 uidwarn = NIL;
1376 /* restart UID validity */
1377 stream->uid_validity = time (0);
1378 }
1379 m = 0; /* lose this UID */
1380 dirty = T; /* mark dirty, set new lastuid */
1381 stream->uid_last = lastuid;
1382 }
1383
1384 t[12] = '\0'; /* parse system flags */
1385 if ((k = strtoul (t+8,NIL,16)) & fEXPUNGED) {
1386 if (m) lastuid = m; /* expunge message, update last UID seen */
1387 else { /* no UID assigned? */
1388 lastuid = ++stream->uid_last;
1389 dirty = T;
1390 }
1391 }
1392 else { /* not expunged, swell the cache */
1393 added = T; /* note that a new message was added */
1394 mail_exists (stream,++nmsgs);
1395 /* instantiate an elt for this message */
1396 (elt = mail_elt (stream,nmsgs))->valid = T;
1397 /* parse the date */
1398 if (!mail_parse_date (elt,LOCAL->buf)) {
1399 sprintf (tmp,"Unable to parse message date at %lu: %.80s",
1400 (unsigned long) curpos,(char *) LOCAL->buf);
1401 MM_LOG (tmp,ERROR);
1402 mbx_abort (stream);
1403 return NIL;
1404 }
1405 /* note file offset of header */
1406 elt->private.special.offset = curpos;
1407 /* and internal header size */
1408 elt->private.special.text.size = i;
1409 /* header size not known yet */
1410 elt->private.msg.header.text.size = 0;
1411 elt->rfc822_size = j; /* note message size */
1412 /* calculate system flags */
1413 if (k & fSEEN) elt->seen = T;
1414 if (k & fDELETED) elt->deleted = T;
1415 if (k & fFLAGGED) elt->flagged = T;
1416 if (k & fANSWERED) elt->answered = T;
1417 if (k & fDRAFT) elt->draft = T;
1418 t[8] = '\0'; /* get user flags value */
1419 elt->user_flags = strtoul (t,NIL,16);
1420 /* UID already assigned? */
1421 if (!(elt->private.uid = m) || !(k & fOLD)) {
1422 elt->recent = T; /* no, mark as recent */
1423 ++recent; /* count up a new recent message */
1424 dirty = T; /* and must rewrite header */
1425 /* assign new UID */
1426 if (!elt->private.uid) elt->private.uid = ++stream->uid_last;
1427 mbx_update_status (stream,elt->msgno,NIL);
1428 }
1429 /* update last parsed UID */
1430 lastuid = elt->private.uid;
1431 }
1432 curpos += i + j; /* update position */
1433 }
1434
1435 if (dirty && !stream->rdonly){/* update header */
1436 mbx_update_header (stream);
1437 fsync (LOCAL->fd); /* make sure all the UID updates take */
1438 }
1439 /* update parsed file size and time */
1440 LOCAL->filesize = sbuf.st_size;
1441 fstat (LOCAL->fd,&sbuf); /* get status again to ensure time is right */
1442 LOCAL->filetime = sbuf.st_mtime;
1443 if (added && !stream->rdonly){/* make sure atime updated */
1444 time_t tp[2];
1445 tp[0] = time (0);
1446 tp[1] = LOCAL->filetime;
1447 utime (stream->mailbox,tp);
1448 }
1449 stream->silent = silent; /* can pass up events now */
1450 mail_exists (stream,nmsgs); /* notify upper level of new mailbox size */
1451 mail_recent (stream,recent); /* and of change in recent messages */
1452 return LONGT; /* return the winnage */
1453 }
1454
1455 /* MBX get cache element with status updating from file
1456 * Accepts: MAIL stream
1457 * message number
1458 * expunge OK flag
1459 * Returns: cache element
1460 */
1461
mbx_elt(MAILSTREAM * stream,unsigned long msgno,long expok)1462 MESSAGECACHE *mbx_elt (MAILSTREAM *stream,unsigned long msgno,long expok)
1463 {
1464 MESSAGECACHE *elt = mail_elt (stream,msgno);
1465 struct { /* old flags */
1466 unsigned int seen : 1;
1467 unsigned int deleted : 1;
1468 unsigned int flagged : 1;
1469 unsigned int answered : 1;
1470 unsigned int draft : 1;
1471 unsigned long user_flags;
1472 } old;
1473 old.seen = elt->seen; old.deleted = elt->deleted; old.flagged = elt->flagged;
1474 old.answered = elt->answered; old.draft = elt->draft;
1475 old.user_flags = elt->user_flags;
1476 /* get new flags */
1477 if (mbx_read_flags (stream,elt) && expok) {
1478 mail_expunged (stream,elt->msgno);
1479 return NIL; /* return this message was expunged */
1480 }
1481 if ((old.seen != elt->seen) || (old.deleted != elt->deleted) ||
1482 (old.flagged != elt->flagged) || (old.answered != elt->answered) ||
1483 (old.draft != elt->draft) || (old.user_flags != elt->user_flags))
1484 MM_FLAGS (stream,msgno); /* let top level know */
1485 return elt;
1486 }
1487
1488 /* MBX read flags from file
1489 * Accepts: MAIL stream
1490 * cache element
1491 * Returns: non-NIL if message expunged
1492 */
1493
mbx_read_flags(MAILSTREAM * stream,MESSAGECACHE * elt)1494 unsigned long mbx_read_flags (MAILSTREAM *stream,MESSAGECACHE *elt)
1495 {
1496 unsigned long i;
1497 struct stat sbuf;
1498 fstat (LOCAL->fd,&sbuf); /* get status */
1499 /* make sure file size is good */
1500 if (sbuf.st_size < LOCAL->filesize) {
1501 sprintf (LOCAL->buf,"Mailbox shrank from %lu to %lu in flag read!",
1502 (unsigned long) LOCAL->filesize,(unsigned long) sbuf.st_size);
1503 fatal (LOCAL->buf);
1504 }
1505 /* set the seek pointer */
1506 lseek (LOCAL->fd,(off_t) elt->private.special.offset +
1507 elt->private.special.text.size - 24,L_SET);
1508 /* read the new flags */
1509 if (read (LOCAL->fd,LOCAL->buf,14) < 0) {
1510 sprintf (LOCAL->buf,"Unable to read new status: %s",strerror (errno));
1511 fatal (LOCAL->buf);
1512 }
1513 if ((LOCAL->buf[0] != ';') || (LOCAL->buf[13] != '-')) {
1514 LOCAL->buf[14] = '\0'; /* tie off buffer for error message */
1515 sprintf (LOCAL->buf+50,"Invalid flags for message %lu (%lu %lu): %s",
1516 elt->msgno,elt->private.special.offset,
1517 elt->private.special.text.size,(char *) LOCAL->buf);
1518 fatal (LOCAL->buf+50);
1519 }
1520 LOCAL->buf[13] = '\0'; /* tie off buffer */
1521 /* calculate system flags */
1522 i = strtoul (LOCAL->buf+9,NIL,16);
1523 elt->seen = i & fSEEN ? T : NIL;
1524 elt->deleted = i & fDELETED ? T : NIL;
1525 elt->flagged = i & fFLAGGED ? T : NIL;
1526 elt->answered = i & fANSWERED ? T : NIL;
1527 elt->draft = i & fDRAFT ? T : NIL;
1528 LOCAL->expunged |= i & fEXPUNGED ? T : NIL;
1529 LOCAL->buf[9] = '\0'; /* tie off flags */
1530 /* get user flags value */
1531 elt->user_flags = strtoul (LOCAL->buf+1,NIL,16);
1532 elt->valid = T; /* have valid flags now */
1533 return i & fEXPUNGED;
1534 }
1535
1536 /* MBX update header
1537 * Accepts: MAIL stream
1538 */
1539
1540 #ifndef CYGKLUDGEOFFSET
1541 #define CYGKLUDGEOFFSET 0
1542 #endif
1543
mbx_update_header(MAILSTREAM * stream)1544 void mbx_update_header (MAILSTREAM *stream)
1545 {
1546 int i;
1547 char *s = LOCAL->buf;
1548 memset (s,'\0',HDRSIZE); /* initialize header */
1549 sprintf (s,"*mbx*\015\012%08lx%08lx\015\012",
1550 stream->uid_validity,stream->uid_last);
1551 for (i = 0; (i < NUSERFLAGS) && stream->user_flags[i]; ++i)
1552 sprintf (s += strlen (s),"%s\015\012",stream->user_flags[i]);
1553 LOCAL->ffuserflag = i; /* first free user flag */
1554 /* can we create more user flags? */
1555 stream->kwd_create = (i < NUSERFLAGS) ? T : NIL;
1556 /* write reserved lines */
1557 while (i++ < NUSERFLAGS) strcat (s,"\015\012");
1558 sprintf (LOCAL->buf + HDRSIZE - 10,"%08lx\015\012",LOCAL->lastpid);
1559 while (T) { /* rewind file */
1560 lseek (LOCAL->fd,CYGKLUDGEOFFSET,L_SET);
1561 /* write new header */
1562 if (write (LOCAL->fd,LOCAL->buf + CYGKLUDGEOFFSET,
1563 HDRSIZE - CYGKLUDGEOFFSET) > 0) break;
1564 MM_NOTIFY (stream,strerror (errno),WARN);
1565 MM_DISKERROR (stream,errno,T);
1566 }
1567 }
1568
1569 /* MBX update status string
1570 * Accepts: MAIL stream
1571 * message number
1572 * flags
1573 */
1574
mbx_update_status(MAILSTREAM * stream,unsigned long msgno,long flags)1575 void mbx_update_status (MAILSTREAM *stream,unsigned long msgno,long flags)
1576 {
1577 struct stat sbuf;
1578 MESSAGECACHE *elt = mail_elt (stream,msgno);
1579 /* readonly */
1580 if (stream->rdonly || !elt->valid) mbx_read_flags (stream,elt);
1581 else { /* readwrite */
1582 fstat (LOCAL->fd,&sbuf); /* get status */
1583 /* make sure file size is good */
1584 if (sbuf.st_size < LOCAL->filesize) {
1585 sprintf (LOCAL->buf,"Mailbox shrank from %lu to %lu in flag update!",
1586 (unsigned long) LOCAL->filesize,(unsigned long) sbuf.st_size);
1587 fatal (LOCAL->buf);
1588 }
1589 /* set the seek pointer */
1590 lseek (LOCAL->fd,(off_t) elt->private.special.offset +
1591 elt->private.special.text.size - 24,L_SET);
1592 /* read the new flags */
1593 if (read (LOCAL->fd,LOCAL->buf,14) < 0) {
1594 sprintf (LOCAL->buf,"Unable to read old status: %s",strerror (errno));
1595 fatal (LOCAL->buf);
1596 }
1597 if ((LOCAL->buf[0] != ';') || (LOCAL->buf[13] != '-')) {
1598 LOCAL->buf[14] = '\0'; /* tie off buffer for error message */
1599 sprintf (LOCAL->buf+50,"Invalid flags for message %lu (%lu %lu): %s",
1600 elt->msgno,elt->private.special.offset,
1601 elt->private.special.text.size,(char *) LOCAL->buf);
1602 fatal (LOCAL->buf+50);
1603 }
1604 /* print new flag string */
1605 sprintf (LOCAL->buf,"%08lx%04x-%08lx",elt->user_flags,(unsigned)
1606 (((elt->deleted && flags) ?
1607 fEXPUNGED : (strtoul (LOCAL->buf+9,NIL,16)) & fEXPUNGED) +
1608 (fSEEN * elt->seen) + (fDELETED * elt->deleted) +
1609 (fFLAGGED * elt->flagged) + (fANSWERED * elt->answered) +
1610 (fDRAFT * elt->draft) + fOLD),elt->private.uid);
1611 while (T) { /* get to that place in the file */
1612 lseek (LOCAL->fd,(off_t) elt->private.special.offset +
1613 elt->private.special.text.size - 23,L_SET);
1614 /* write new flags and UID */
1615 if (write (LOCAL->fd,LOCAL->buf,21) > 0) break;
1616 MM_NOTIFY (stream,strerror (errno),WARN);
1617 MM_DISKERROR (stream,errno,T);
1618 }
1619 }
1620 }
1621
1622 /* MBX locate header for a message
1623 * Accepts: MAIL stream
1624 * message number
1625 * pointer to returned header size
1626 * pointer to possible returned header
1627 * Returns: position of header in file
1628 */
1629
1630 #define HDRBUFLEN 16384 /* good enough for most headers */
1631 #define SLOP 4 /* CR LF CR LF */
1632
mbx_hdrpos(MAILSTREAM * stream,unsigned long msgno,unsigned long * size,char ** hdr)1633 unsigned long mbx_hdrpos (MAILSTREAM *stream,unsigned long msgno,
1634 unsigned long *size,char **hdr)
1635 {
1636 unsigned long siz,done;
1637 long i;
1638 unsigned char *s,*t,*te;
1639 MESSAGECACHE *elt = mail_elt (stream,msgno);
1640 unsigned long ret = elt->private.special.offset +
1641 elt->private.special.text.size;
1642 if (hdr) *hdr = NIL; /* assume no header returned */
1643 /* is header size known? */
1644 if (*size = elt->private.msg.header.text.size) return ret;
1645 /* paranoia check */
1646 if (LOCAL->buflen < (HDRBUFLEN + SLOP))
1647 fatal ("LOCAL->buf smaller than HDRBUFLEN");
1648 lseek (LOCAL->fd,ret,L_SET); /* get to header position */
1649 /* read HDRBUFLEN chunks with 4 byte slop */
1650 for (done = siz = 0, s = LOCAL->buf;
1651 (i = min ((long) (elt->rfc822_size - done),(long) HDRBUFLEN)) &&
1652 (read (LOCAL->fd,s,i) == i);
1653 done += i, siz += (t - LOCAL->buf) - SLOP, s = LOCAL->buf + SLOP) {
1654 te = (t = s + i) - 12; /* calculate end of fast scan */
1655 /* fast scan for CR */
1656 for (s = LOCAL->buf; s < te;)
1657 if (((*s++ == '\015') || (*s++ == '\015') || (*s++ == '\015') ||
1658 (*s++ == '\015') || (*s++ == '\015') || (*s++ == '\015') ||
1659 (*s++ == '\015') || (*s++ == '\015') || (*s++ == '\015') ||
1660 (*s++ == '\015') || (*s++ == '\015') || (*s++ == '\015')) &&
1661 (*s == '\012') && (*++s == '\015') && (*++s == '\012')) {
1662 *size = elt->private.msg.header.text.size = siz + (++s - LOCAL->buf);
1663 if (hdr) *hdr = LOCAL->buf;
1664 return ret;
1665 }
1666 for (te = t - 3; (s < te);) /* final character-at-a-time scan */
1667 if ((*s++ == '\015') && (*s == '\012') && (*++s == '\015') &&
1668 (*++s == '\012')) {
1669 *size = elt->private.msg.header.text.size = siz + (++s - LOCAL->buf);
1670 if (hdr) *hdr = LOCAL->buf;
1671 return ret;
1672 }
1673 if (i <= SLOP) break; /* end of data */
1674 /* slide over last 4 bytes */
1675 memmove (LOCAL->buf,t - SLOP,SLOP);
1676 hdr = NIL; /* can't return header this way */
1677 }
1678 /* not found: header consumes entire message */
1679 elt->private.msg.header.text.size = *size = elt->rfc822_size;
1680 if (hdr) *hdr = LOCAL->buf; /* possibly return header too */
1681 return ret;
1682 }
1683
1684 /* MBX mail rewrite mailbox
1685 * Accepts: MAIL stream
1686 * pointer to return reclaimed size
1687 * flags (0 = no expunge, 1 = expunge deleted, -1 = expunge sequence)
1688 * Returns: number of expunged messages
1689 */
1690
mbx_rewrite(MAILSTREAM * stream,unsigned long * reclaimed,long flags)1691 unsigned long mbx_rewrite (MAILSTREAM *stream,unsigned long *reclaimed,
1692 long flags)
1693 {
1694 time_t tp[2];
1695 struct stat sbuf;
1696 off_t pos,ppos;
1697 int ld;
1698 unsigned long i,j,k,m,delta;
1699 unsigned long n = *reclaimed = 0;
1700 unsigned long recent = 0;
1701 char lock[MAILTMPLEN];
1702 MESSAGECACHE *elt;
1703 blocknotify_t bn = (blocknotify_t) mail_parameters (NIL,GET_BLOCKNOTIFY,NIL);
1704 /* The cretins who designed flock() created a window of vulnerability in
1705 * upgrading locks from shared to exclusive or downgrading from exclusive
1706 * to shared. Rather than maintain the lock at shared status at a minimum,
1707 * flock() actually *releases* the former lock. Obviously they never talked
1708 * to any database guys. Fortunately, we have the parse/append permission
1709 * lock. If we require this lock before going exclusive on the mailbox,
1710 * another process can not sneak in and steal the exclusive mailbox lock on
1711 * us, because it will block on trying to get parse/append permission first.
1712 */
1713 /* get parse/append permission */
1714 if ((ld = lockfd (LOCAL->fd,lock,LOCK_EX)) < 0) {
1715 MM_LOG ("Unable to lock mailbox for rewrite",ERROR);
1716 return 0;
1717 }
1718 fstat (LOCAL->fd,&sbuf); /* get current write time */
1719 if (LOCAL->filetime && !LOCAL->flagcheck &&
1720 (LOCAL->filetime < sbuf.st_mtime)) LOCAL->flagcheck = T;
1721 if (!mbx_parse (stream)) { /* make sure see any newly-arrived messages */
1722 unlockfd (ld,lock); /* failed?? */
1723 return 0;
1724 }
1725 if (LOCAL->flagcheck) { /* sweep flags if need flagcheck */
1726 LOCAL->filetime = sbuf.st_mtime;
1727 for (i = 1; i <= stream->nmsgs; ++i) mbx_elt (stream,i,NIL);
1728 LOCAL->flagcheck = NIL;
1729 }
1730
1731 /* get exclusive access */
1732 if (!flock (LOCAL->fd,LOCK_EX|LOCK_NB)) {
1733 MM_CRITICAL (stream); /* go critical */
1734 for (i = 1,delta = 0,pos = ppos = HDRSIZE; i <= stream->nmsgs; ) {
1735 /* note if message not at predicted location */
1736 if (m = (elt = mbx_elt (stream,i,NIL))->private.special.offset - ppos) {
1737 ppos = elt->private.special.offset;
1738 *reclaimed += m; /* note reclaimed message space */
1739 delta += m; /* and as expunge delta */
1740 }
1741 /* number of bytes to smash or preserve */
1742 ppos += (k = elt->private.special.text.size + elt->rfc822_size);
1743 /* if need to expunge this message*/
1744 if (flags && elt->deleted && ((flags > 0) || elt->sequence)) {
1745 delta += k; /* number of bytes to delete */
1746 mail_expunged(stream,i);/* notify upper levels */
1747 n++; /* count up one more expunged message */
1748 }
1749 else { /* preserved message */
1750 i++; /* count this message */
1751 if (elt->recent) ++recent;
1752 if (delta) { /* moved, note first byte to preserve */
1753 j = elt->private.special.offset;
1754 do { /* read from source position */
1755 m = min (k,LOCAL->buflen);
1756 lseek (LOCAL->fd,j,L_SET);
1757 read (LOCAL->fd,LOCAL->buf,m);
1758 pos = j - delta; /* write to destination position */
1759 while (T) {
1760 lseek (LOCAL->fd,pos,L_SET);
1761 if (write (LOCAL->fd,LOCAL->buf,m) > 0) break;
1762 MM_NOTIFY (stream,strerror (errno),WARN);
1763 MM_DISKERROR (stream,errno,T);
1764 }
1765 pos += m; /* new position */
1766 j += m; /* next chunk, perhaps */
1767 } while (k -= m); /* until done */
1768 /* note the new address of this text */
1769 elt->private.special.offset -= delta;
1770 }
1771 /* preserved but no deleted messages yet */
1772 else pos = elt->private.special.offset + k;
1773 }
1774 }
1775 /* deltaed file size match position? */
1776 if (m = (LOCAL->filesize -= delta) - pos) {
1777 *reclaimed += m; /* probably an fEXPUNGED msg */
1778 LOCAL->filesize = pos; /* set correct size */
1779 }
1780 /* truncate file after last message */
1781 ftruncate (LOCAL->fd,LOCAL->filesize);
1782 fsync (LOCAL->fd); /* force disk update */
1783 MM_NOCRITICAL (stream); /* release critical */
1784 (*bn) (BLOCK_FILELOCK,NIL);
1785 flock (LOCAL->fd,LOCK_SH); /* allow sharers again */
1786 (*bn) (BLOCK_NONE,NIL);
1787 }
1788
1789 else { /* can't get exclusive */
1790 (*bn) (BLOCK_FILELOCK,NIL);
1791 flock (LOCAL->fd,LOCK_SH); /* recover previous shared mailbox lock */
1792 (*bn) (BLOCK_NONE,NIL);
1793 /* do hide-expunge when shared */
1794 if (flags) for (i = 1; i <= stream->nmsgs; ) {
1795 if (elt = mbx_elt (stream,i,T)) {
1796 /* make the message invisible */
1797 if (elt->deleted && ((flags > 0) || elt->sequence)) {
1798 mbx_update_status (stream,elt->msgno,LONGT);
1799 /* notify upper levels */
1800 mail_expunged (stream,i);
1801 n++; /* count up one more expunged message */
1802 }
1803 else {
1804 i++; /* preserved message */
1805 if (elt->recent) ++recent;
1806 }
1807 }
1808 else n++; /* count up one more expunged message */
1809 }
1810 fsync (LOCAL->fd); /* force disk update */
1811 }
1812 fstat (LOCAL->fd,&sbuf); /* get new write time */
1813 tp[1] = LOCAL->filetime = sbuf.st_mtime;
1814 tp[0] = time (0); /* reset atime to now */
1815 utime (stream->mailbox,tp);
1816 unlockfd (ld,lock); /* release exclusive parse/append permission */
1817 /* notify upper level of new mailbox size */
1818 mail_exists (stream,stream->nmsgs);
1819 mail_recent (stream,recent);
1820 return n; /* return number of expunged messages */
1821 }
1822
1823 /* MBX mail lock for flag updating
1824 * Accepts: stream
1825 * Returns: T if successful, NIL if failure
1826 */
1827
mbx_flaglock(MAILSTREAM * stream)1828 long mbx_flaglock (MAILSTREAM *stream)
1829 {
1830 struct stat sbuf;
1831 unsigned long i;
1832 int ld;
1833 char lock[MAILTMPLEN];
1834 /* no-op if readonly or already locked */
1835 if (!stream->rdonly && LOCAL && (LOCAL->fd >= 0) && (LOCAL->ld < 0)) {
1836 /* lock now */
1837 if ((ld = lockfd (LOCAL->fd,lock,LOCK_EX)) < 0) return NIL;
1838 if (!LOCAL->flagcheck) { /* don't do this if flagcheck already needed */
1839 if (LOCAL->filetime) { /* know previous time? */
1840 fstat (LOCAL->fd,&sbuf);/* get current write time */
1841 if (LOCAL->filetime < sbuf.st_mtime) LOCAL->flagcheck = T;
1842 LOCAL->filetime = 0; /* don't do this test for any other messages */
1843 }
1844 if (!mbx_parse (stream)) {/* parse mailbox */
1845 unlockfd (ld,lock); /* shouldn't happen */
1846 return NIL;
1847 }
1848 if (LOCAL->flagcheck) /* invalidate cache if flagcheck */
1849 for (i = 1; i <= stream->nmsgs; ++i) mail_elt (stream,i)->valid = NIL;
1850 }
1851 LOCAL->ld = ld; /* copy to stream for subsequent calls */
1852 memcpy (LOCAL->lock,lock,MAILTMPLEN);
1853 }
1854 return LONGT;
1855 }
1856