1 /* ========================================================================
2  * Copyright 1988-2008 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:	MX mail routines
16  *
17  * Author(s):	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 May 1996
26  * Last Edited:	6 January 2008
27  */
28 
29 
30 #include <stdio.h>
31 #include <ctype.h>
32 #include <errno.h>
33 extern int errno;		/* just in case */
34 #include "mail.h"
35 #include "osdep.h"
36 #include <pwd.h>
37 #include <sys/stat.h>
38 #include <sys/time.h>
39 #include "misc.h"
40 #include "dummy.h"
41 #include "fdstring.h"
42 
43 /* Index file */
44 
45 #define MXINDEXNAME "/.mxindex"
46 #define MXINDEX(d,s) strcat (mx_file (d,s),MXINDEXNAME)
47 
48 
49 /* MX I/O stream local data */
50 
51 typedef struct mx_local {
52   int fd;			/* file descriptor of open index */
53   unsigned char *buf;		/* temporary buffer */
54   unsigned long buflen;		/* current size of temporary buffer */
55   unsigned long cachedtexts;	/* total size of all cached texts */
56   time_t scantime;		/* last time directory scanned */
57 } MXLOCAL;
58 
59 
60 /* Convenient access to local data */
61 
62 #define LOCAL ((MXLOCAL *) stream->local)
63 
64 
65 /* Function prototypes */
66 
67 DRIVER *mx_valid (char *name);
68 int mx_isvalid (char *name,char *tmp);
69 int mx_namevalid (char *name);
70 void *mx_parameters (long function,void *value);
71 long mx_dirfmttest (char *name);
72 void mx_scan (MAILSTREAM *stream,char *ref,char *pat,char *contents);
73 long mx_scan_contents (char *name,char *contents,unsigned long csiz,
74 		       unsigned long fsiz);
75 void mx_list (MAILSTREAM *stream,char *ref,char *pat);
76 void mx_lsub (MAILSTREAM *stream,char *ref,char *pat);
77 long mx_subscribe (MAILSTREAM *stream,char *mailbox);
78 long mx_unsubscribe (MAILSTREAM *stream,char *mailbox);
79 long mx_create (MAILSTREAM *stream,char *mailbox);
80 long mx_delete (MAILSTREAM *stream,char *mailbox);
81 long mx_rename (MAILSTREAM *stream,char *old,char *newname);
82 int mx_rename_work (char *src,size_t srcl,char *dst,size_t dstl,char *name);
83 MAILSTREAM *mx_open (MAILSTREAM *stream);
84 void mx_close (MAILSTREAM *stream,long options);
85 void mx_fast (MAILSTREAM *stream,char *sequence,long flags);
86 char *mx_fast_work (MAILSTREAM *stream,MESSAGECACHE *elt);
87 char *mx_header (MAILSTREAM *stream,unsigned long msgno,unsigned long *length,
88 		 long flags);
89 long mx_text (MAILSTREAM *stream,unsigned long msgno,STRING *bs,long flags);
90 void mx_flag (MAILSTREAM *stream,char *sequence,char *flag,long flags);
91 void mx_flagmsg (MAILSTREAM *stream,MESSAGECACHE *elt);
92 long mx_ping (MAILSTREAM *stream);
93 void mx_check (MAILSTREAM *stream);
94 long mx_expunge (MAILSTREAM *stream,char *sequence,long options);
95 long mx_copy (MAILSTREAM *stream,char *sequence,char *mailbox,
96 	      long options);
97 long mx_append (MAILSTREAM *stream,char *mailbox,append_t af,void *data);
98 long mx_append_msg (MAILSTREAM *stream,char *flags,MESSAGECACHE *elt,
99 		    STRING *st,SEARCHSET *set);
100 
101 int mx_select (struct direct *name);
102 int mx_numsort (const void *d1,const void *d2);
103 char *mx_file (char *dst,char *name);
104 long mx_lockindex (MAILSTREAM *stream);
105 void mx_unlockindex (MAILSTREAM *stream);
106 void mx_setdate (char *file,MESSAGECACHE *elt);
107 
108 
109 /* MX mail routines */
110 
111 
112 /* Driver dispatch used by MAIL */
113 
114 DRIVER mxdriver = {
115   "mx",				/* driver name */
116 				/* driver flags */
117   DR_MAIL|DR_LOCAL|DR_NOFAST|DR_CRLF|DR_LOCKING|DR_DIRFMT,
118   (DRIVER *) NIL,		/* next driver */
119   mx_valid,			/* mailbox is valid for us */
120   mx_parameters,		/* manipulate parameters */
121   mx_scan,			/* scan mailboxes */
122   mx_list,			/* find mailboxes */
123   mx_lsub,			/* find subscribed mailboxes */
124   mx_subscribe,			/* subscribe to mailbox */
125   mx_unsubscribe,		/* unsubscribe from mailbox */
126   mx_create,			/* create mailbox */
127   mx_delete,			/* delete mailbox */
128   mx_rename,			/* rename mailbox */
129   mail_status_default,		/* status of mailbox */
130   mx_open,			/* open mailbox */
131   mx_close,			/* close mailbox */
132   mx_fast,			/* fetch message "fast" attributes */
133   NIL,				/* fetch message flags */
134   NIL,				/* fetch overview */
135   NIL,				/* fetch message envelopes */
136   mx_header,			/* fetch message header only */
137   mx_text,			/* fetch message body only */
138   NIL,				/* fetch partial message test */
139   NIL,				/* unique identifier */
140   NIL,				/* message number */
141   mx_flag,			/* modify flags */
142   mx_flagmsg,			/* per-message modify flags */
143   NIL,				/* search for message based on criteria */
144   NIL,				/* sort messages */
145   NIL,				/* thread messages */
146   mx_ping,			/* ping mailbox to see if still alive */
147   mx_check,			/* check for new messages */
148   mx_expunge,			/* expunge deleted messages */
149   mx_copy,			/* copy messages to another mailbox */
150   mx_append,			/* append string message to mailbox */
151   NIL				/* garbage collect stream */
152 };
153 
154 				/* prototype stream */
155 MAILSTREAM mxproto = {&mxdriver};
156 
157 /* MX mail validate mailbox
158  * Accepts: mailbox name
159  * Returns: our driver if name is valid, NIL otherwise
160  */
161 
mx_valid(char * name)162 DRIVER *mx_valid (char *name)
163 {
164   char tmp[MAILTMPLEN];
165   return mx_isvalid (name,tmp) ? &mxdriver : NIL;
166 }
167 
168 
169 /* MX mail test for valid mailbox
170  * Accepts: mailbox name
171  *	    temporary buffer to use
172  * Returns: T if valid, NIL otherwise with errno holding dir stat error
173  */
174 
mx_isvalid(char * name,char * tmp)175 int mx_isvalid (char *name,char *tmp)
176 {
177   struct stat sbuf;
178   errno = NIL;			/* zap error */
179   if ((strlen (name) <= NETMAXMBX) && *mx_file (tmp,name) &&
180       !stat (tmp,&sbuf) && ((sbuf.st_mode & S_IFMT) == S_IFDIR)) {
181 				/* name is directory; is it mx? */
182     if (!stat (MXINDEX (tmp,name),&sbuf) &&
183 	((sbuf.st_mode & S_IFMT) == S_IFREG)) return T;
184     errno = NIL;		/* directory but not mx */
185   }
186   else if (!compare_cstring (name,"INBOX")) errno = NIL;
187   return NIL;
188 }
189 
190 
191 /* MX mail test for valid mailbox
192  * Accepts: mailbox name
193  * Returns: T if valid, NIL otherwise
194  */
195 
mx_namevalid(char * name)196 int mx_namevalid (char *name)
197 {
198   char *s = (*name == '/') ? name + 1 : name;
199   while (s && *s) {		/* make sure valid name */
200     if (isdigit (*s)) s++;	/* digit, check this node further... */
201     else if (*s == '/') break;	/* all digit node, barf */
202 				/* non-digit, skip to next node or return */
203     else if (!((s = strchr (s+1,'/')) && *++s)) return T;
204   }
205   return NIL;			/* all numeric or empty node */
206 }
207 
208 /* MX manipulate driver parameters
209  * Accepts: function code
210  *	    function-dependent value
211  * Returns: function-dependent return value
212  */
213 
mx_parameters(long function,void * value)214 void *mx_parameters (long function,void *value)
215 {
216   void *ret = NIL;
217   switch ((int) function) {
218   case GET_INBOXPATH:
219     if (value) ret = mailboxfile ((char *) value,"~/INBOX");
220     break;
221   case GET_DIRFMTTEST:
222     ret = (void *) mx_dirfmttest;
223     break;
224   case GET_SCANCONTENTS:
225     ret = (void *) mx_scan_contents;
226     break;
227   }
228   return ret;
229 }
230 
231 
232 /* MX test for directory format internal node
233  * Accepts: candidate node name
234  * Returns: T if internal name, NIL otherwise
235  */
236 
mx_dirfmttest(char * name)237 long mx_dirfmttest (char *name)
238 {
239   int c;
240 				/* success if index name or all-numberic */
241   if (strcmp (name,MXINDEXNAME+1))
242     while (c = *name++) if (!isdigit (c)) return NIL;
243   return LONGT;
244 }
245 
246 /* MX scan mailboxes
247  * Accepts: mail stream
248  *	    reference
249  *	    pattern to search
250  *	    string to scan
251  */
252 
mx_scan(MAILSTREAM * stream,char * ref,char * pat,char * contents)253 void mx_scan (MAILSTREAM *stream,char *ref,char *pat,char *contents)
254 {
255   if (stream) dummy_scan (NIL,ref,pat,contents);
256 }
257 
258 
259 /* MX scan mailbox for contents
260  * Accepts: mailbox name
261  *	    desired contents
262  *	    contents size
263  *	    file size (ignored)
264  * Returns: NIL if contents not found, T if found
265  */
266 
mx_scan_contents(char * name,char * contents,unsigned long csiz,unsigned long fsiz)267 long mx_scan_contents (char *name,char *contents,unsigned long csiz,
268 			unsigned long fsiz)
269 {
270   long i,nfiles;
271   void *a;
272   char *s;
273   long ret = NIL;
274   size_t namelen = strlen (name);
275   struct stat sbuf;
276   struct direct **names = NIL;
277   if ((nfiles = scandir (name,&names,mx_select,mx_numsort)) > 0)
278     for (i = 0; i < nfiles; ++i) {
279       if (!ret) {
280 	sprintf (s = (char *) fs_get (namelen + strlen (names[i]->d_name) + 2),
281 		 "%s/%s",name,names[i]->d_name);
282 	if (!stat (s,&sbuf) && (csiz <= sbuf.st_size))
283 	  ret = dummy_scan_contents (s,contents,csiz,sbuf.st_size);
284 	fs_give ((void **) &s);
285       }
286       fs_give ((void **) &names[i]);
287     }
288 				/* free directory list */
289   if (a = (void *) names) fs_give ((void **) &a);
290   return ret;
291 }
292 
293 /* MX list mailboxes
294  * Accepts: mail stream
295  *	    reference
296  *	    pattern to search
297  */
298 
mx_list(MAILSTREAM * stream,char * ref,char * pat)299 void mx_list (MAILSTREAM *stream,char *ref,char *pat)
300 {
301   if (stream) dummy_list (NIL,ref,pat);
302 }
303 
304 
305 /* MX list subscribed mailboxes
306  * Accepts: mail stream
307  *	    reference
308  *	    pattern to search
309  */
310 
mx_lsub(MAILSTREAM * stream,char * ref,char * pat)311 void mx_lsub (MAILSTREAM *stream,char *ref,char *pat)
312 {
313   if (stream) dummy_lsub (NIL,ref,pat);
314 }
315 
316 /* MX mail subscribe to mailbox
317  * Accepts: mail stream
318  *	    mailbox to add to subscription list
319  * Returns: T on success, NIL on failure
320  */
321 
mx_subscribe(MAILSTREAM * stream,char * mailbox)322 long mx_subscribe (MAILSTREAM *stream,char *mailbox)
323 {
324   return sm_subscribe (mailbox);
325 }
326 
327 
328 /* MX mail unsubscribe to mailbox
329  * Accepts: mail stream
330  *	    mailbox to delete from subscription list
331  * Returns: T on success, NIL on failure
332  */
333 
mx_unsubscribe(MAILSTREAM * stream,char * mailbox)334 long mx_unsubscribe (MAILSTREAM *stream,char *mailbox)
335 {
336   return sm_unsubscribe (mailbox);
337 }
338 
339 /* MX mail create mailbox
340  * Accepts: mail stream
341  *	    mailbox name to create
342  * Returns: T on success, NIL on failure
343  */
344 
mx_create(MAILSTREAM * stream,char * mailbox)345 long mx_create (MAILSTREAM *stream,char *mailbox)
346 {
347   DRIVER *test;
348   int fd;
349   char *s,tmp[MAILTMPLEN];
350   int mask = umask (0);
351   long ret = NIL;
352   if (!mx_namevalid (mailbox))	/* validate name */
353     sprintf (tmp,"Can't create mailbox %.80s: invalid MX-format name",mailbox);
354 				/* must not already exist */
355   else if ((test = mail_valid (NIL,mailbox,NIL)) &&
356 	   strcmp (test->name,"dummy"))
357     sprintf (tmp,"Can't create mailbox %.80s: mailbox already exists",mailbox);
358 				/* create directory */
359   else if (!dummy_create_path (stream,MXINDEX (tmp,mailbox),
360 			       get_dir_protection (mailbox)))
361     sprintf (tmp,"Can't create mailbox %.80s: %s",mailbox,strerror (errno));
362   else {			/* success */
363 				/* set index protection */
364     set_mbx_protections (mailbox,tmp);
365 				/* tie off directory name */
366     *(s = strrchr (tmp,'/') + 1) = '\0';
367 				/* set directory protection */
368     set_mbx_protections (mailbox,tmp);
369     ret = LONGT;
370   }
371   umask (mask);			/* restore mask */
372   if (!ret) MM_LOG (tmp,ERROR);	/* some error */
373   return ret;
374 }
375 
376 /* MX mail delete mailbox
377  *	    mailbox name to delete
378  * Returns: T on success, NIL on failure
379  */
380 
mx_delete(MAILSTREAM * stream,char * mailbox)381 long mx_delete (MAILSTREAM *stream,char *mailbox)
382 {
383   DIR *dirp;
384   struct direct *d;
385   char *s;
386   char tmp[MAILTMPLEN];
387   if (!mx_isvalid (mailbox,tmp))
388     sprintf (tmp,"Can't delete mailbox %.80s: no such mailbox",mailbox);
389 				/* delete index */
390   else if (unlink (MXINDEX (tmp,mailbox)))
391     sprintf (tmp,"Can't delete mailbox %.80s index: %s",
392 	     mailbox,strerror (errno));
393   else {			/* get directory name */
394     *(s = strrchr (tmp,'/')) = '\0';
395     if (dirp = opendir (tmp)) {	/* open directory */
396       *s++ = '/';		/* restore delimiter */
397 				/* massacre messages */
398       while (d = readdir (dirp)) if (mx_select (d)) {
399 	strcpy (s,d->d_name);	/* make path */
400 	unlink (tmp);		/* sayonara */
401       }
402       closedir (dirp);		/* flush directory */
403       *(s = strrchr (tmp,'/')) = '\0';
404       if (rmdir (tmp)) {	/* try to remove the directory */
405 	sprintf (tmp,"Can't delete name %.80s: %s",mailbox,strerror (errno));
406 	MM_LOG (tmp,WARN);
407       }
408     }
409     return T;			/* always success */
410   }
411   MM_LOG (tmp,ERROR);		/* something failed */
412   return NIL;
413 }
414 
415 /* MX mail rename mailbox
416  * Accepts: MX mail stream
417  *	    old mailbox name
418  *	    new mailbox name
419  * Returns: T on success, NIL on failure
420  */
421 
mx_rename(MAILSTREAM * stream,char * old,char * newname)422 long mx_rename (MAILSTREAM *stream,char *old,char *newname)
423 {
424   char c,*s,tmp[MAILTMPLEN],tmp1[MAILTMPLEN];
425   struct stat sbuf;
426   if (!mx_isvalid (old,tmp))
427     sprintf (tmp,"Can't rename mailbox %.80s: no such mailbox",old);
428   else if (!mx_namevalid (newname))
429     sprintf (tmp,"Can't rename to mailbox %.80s: invalid MX-format name",
430 	     newname);
431 				/* new mailbox name must not be valid */
432   else if (mx_isvalid (newname,tmp))
433     sprintf (tmp,"Can't rename to mailbox %.80s: destination already exists",
434 	     newname);
435   else {
436     mx_file (tmp,old);		/* build old directory name */
437     mx_file (tmp1,newname);	/* and new directory name */
438 				/* easy if not INBOX */
439     if (compare_cstring (old,"INBOX")) {
440 				/* found superior to destination name? */
441       if (s = strrchr (mx_file (tmp1,newname),'/')) {
442 	c = *++s;	    /* remember first character of inferior */
443 	*s = '\0';		/* tie off to get just superior */
444 				/* name doesn't exist, create it */
445 	if ((stat (tmp1,&sbuf) || ((sbuf.st_mode & S_IFMT) != S_IFDIR)) &&
446 	    !dummy_create_path (stream,tmp1,get_dir_protection (newname)))
447 	  return NIL;
448 	*s = c;			/* restore full name */
449       }
450       if (!rename (tmp,tmp1)) return LONGT;
451     }
452 
453 				/* RFC 3501 requires this */
454     else if (dummy_create_path (stream,strcat (tmp1,"/"),
455 				get_dir_protection (newname))) {
456       void *a;
457       int i,n,lasterror;
458       struct direct **names = NIL;
459       size_t srcl = strlen (tmp);
460       size_t dstl = strlen (tmp1);
461 				/* rename each mx file to new directory */
462       for (i = lasterror = 0,n = scandir (tmp,&names,mx_select,mx_numsort);
463 	   i < n; ++i) {
464 	if (mx_rename_work (tmp,srcl,tmp1,dstl,names[i]->d_name))
465 	  lasterror = errno;
466 	fs_give ((void **) &names[i]);
467       }
468 				/* free directory list */
469       if (a = (void *) names) fs_give ((void **) &a);
470       if (lasterror || mx_rename_work (tmp,srcl,tmp1,dstl,MXINDEXNAME+1))
471 	errno = lasterror;
472       else return mx_create (NIL,"INBOX");
473     }
474     sprintf (tmp,"Can't rename mailbox %.80s to %.80s: %s",
475 	     old,newname,strerror (errno));
476   }
477   MM_LOG (tmp,ERROR);		/* something failed */
478   return NIL;
479 }
480 
481 
482 /* MX rename worker routine
483  * Accepts: source directory name
484  *	    source directory name length
485  *	    destination directory name
486  *	    destination directory name length
487  *	    name of node to move
488  * Returns: zero if success, non-zero if error
489  */
490 
mx_rename_work(char * src,size_t srcl,char * dst,size_t dstl,char * name)491 int mx_rename_work (char *src,size_t srcl,char *dst,size_t dstl,char *name)
492 {
493   int ret;
494   size_t len = strlen (name);
495   char *s = (char *) fs_get (srcl + len + 2);
496   char *d = (char *) fs_get (dstl + len + 1);
497   sprintf (s,"%s/%s",src,name);
498   sprintf (d,"%s%s",dst,name);
499   ret = rename (s,d);
500   fs_give ((void **) &s);
501   fs_give ((void **) &d);
502   return ret;
503 }
504 
505 /* MX mail open
506  * Accepts: stream to open
507  * Returns: stream on success, NIL on failure
508  */
509 
mx_open(MAILSTREAM * stream)510 MAILSTREAM *mx_open (MAILSTREAM *stream)
511 {
512   char tmp[MAILTMPLEN];
513 				/* return prototype for OP_PROTOTYPE call */
514   if (!stream) return user_flags (&mxproto);
515   if (stream->local) fatal ("mx recycle stream");
516   stream->local = fs_get (sizeof (MXLOCAL));
517 				/* note if an INBOX or not */
518   stream->inbox = !compare_cstring (stream->mailbox,"INBOX");
519   mx_file (tmp,stream->mailbox);/* get directory name */
520 				/* canonicalize mailbox name */
521   fs_give ((void **) &stream->mailbox);
522   stream->mailbox = cpystr (tmp);
523 				/* make temporary buffer */
524   LOCAL->buf = (char *) fs_get (CHUNKSIZE);
525   LOCAL->buflen = CHUNKSIZE - 1;
526   LOCAL->scantime = 0;		/* not scanned yet */
527   LOCAL->fd = -1;		/* no index yet */
528   LOCAL->cachedtexts = 0;	/* no cached texts */
529   stream->sequence++;		/* bump sequence number */
530 				/* parse mailbox */
531   stream->nmsgs = stream->recent = 0;
532   if (mx_ping (stream) && !(stream->nmsgs || stream->silent))
533     MM_LOG ("Mailbox is empty",(long) NIL);
534   stream->perm_seen = stream->perm_deleted = stream->perm_flagged =
535     stream->perm_answered = stream->perm_draft = stream->rdonly ? NIL : T;
536   stream->perm_user_flags = stream->rdonly ? NIL : 0xffffffff;
537   stream->kwd_create = (stream->user_flags[NUSERFLAGS-1] || stream->rdonly) ?
538     NIL : T;			/* can we create new user flags? */
539   return stream;		/* return stream to caller */
540 }
541 
542 /* MX mail close
543  * Accepts: MAIL stream
544  *	    close options
545  */
546 
mx_close(MAILSTREAM * stream,long options)547 void mx_close (MAILSTREAM *stream,long options)
548 {
549   if (LOCAL) {			/* only if a file is open */
550     int silent = stream->silent;
551     stream->silent = T;		/* note this stream is dying */
552     if (options & CL_EXPUNGE) mx_expunge (stream,NIL,NIL);
553 				/* free local scratch buffer */
554     if (LOCAL->buf) fs_give ((void **) &LOCAL->buf);
555 				/* nuke the local data */
556     fs_give ((void **) &stream->local);
557     stream->dtb = NIL;		/* log out the DTB */
558     stream->silent = silent;	/* reset silent state */
559   }
560 }
561 
562 /* MX mail fetch fast information
563  * Accepts: MAIL stream
564  *	    sequence
565  *	    option flags
566  */
567 
mx_fast(MAILSTREAM * stream,char * sequence,long flags)568 void mx_fast (MAILSTREAM *stream,char *sequence,long flags)
569 {
570   unsigned long i;
571   MESSAGECACHE *elt;
572   if (stream && LOCAL &&
573       ((flags & FT_UID) ? mail_uid_sequence (stream,sequence) :
574        mail_sequence (stream,sequence)))
575     for (i = 1; i <= stream->nmsgs; i++)
576       if ((elt = mail_elt (stream,i))->sequence) mx_fast_work (stream,elt);
577 }
578 
579 
580 /* MX mail fetch fast information
581  * Accepts: MAIL stream
582  *	    message cache element
583  * Returns: name of message file
584  */
585 
mx_fast_work(MAILSTREAM * stream,MESSAGECACHE * elt)586 char *mx_fast_work (MAILSTREAM *stream,MESSAGECACHE *elt)
587 {
588   struct stat sbuf;
589   struct tm *tm;
590 				/* build message file name */
591   sprintf (LOCAL->buf,"%s/%lu",stream->mailbox,elt->private.uid);
592 				/* have size yet? */
593   if (!elt->rfc822_size && !stat (LOCAL->buf,&sbuf)) {
594 				/* make plausible IMAPish date string */
595     tm = gmtime (&sbuf.st_mtime);
596     elt->day = tm->tm_mday; elt->month = tm->tm_mon + 1;
597     elt->year = tm->tm_year + 1900 - BASEYEAR;
598     elt->hours = tm->tm_hour; elt->minutes = tm->tm_min;
599     elt->seconds = tm->tm_sec;
600     elt->zhours = 0; elt->zminutes = 0; elt->zoccident = 0;
601     elt->rfc822_size = sbuf.st_size;
602   }
603   return (char *) LOCAL->buf;	/* return file name */
604 }
605 
606 /* MX mail fetch message header
607  * Accepts: MAIL stream
608  *	    message # to fetch
609  *	    pointer to returned header text length
610  *	    option flags
611  * Returns: message header in RFC822 format
612  */
613 
mx_header(MAILSTREAM * stream,unsigned long msgno,unsigned long * length,long flags)614 char *mx_header (MAILSTREAM *stream,unsigned long msgno,unsigned long *length,
615 		 long flags)
616 {
617   unsigned long i;
618   int fd;
619   MESSAGECACHE *elt;
620   *length = 0;			/* default to empty */
621   if (flags & FT_UID) return "";/* UID call "impossible" */
622   elt = mail_elt (stream,msgno);/* get elt */
623   if (!elt->private.msg.header.text.data) {
624 				/* purge cache if too big */
625     if (LOCAL->cachedtexts > max (stream->nmsgs * 4096,2097152)) {
626       mail_gc (stream,GC_TEXTS);/* just can't keep that much */
627       LOCAL->cachedtexts = 0;
628     }
629     if ((fd = open (mx_fast_work (stream,elt),O_RDONLY,NIL)) < 0) return "";
630 				/* is buffer big enough? */
631     if (elt->rfc822_size > LOCAL->buflen) {
632       fs_give ((void **) &LOCAL->buf);
633       LOCAL->buf = (char *) fs_get ((LOCAL->buflen = elt->rfc822_size) + 1);
634     }
635 				/* slurp message */
636     read (fd,LOCAL->buf,elt->rfc822_size);
637 				/* tie off file */
638     LOCAL->buf[elt->rfc822_size] = '\0';
639     close (fd);			/* flush message file */
640 				/* find end of header */
641     if (elt->rfc822_size < 4) i = 0;
642     else for (i = 4; (i < elt->rfc822_size) &&
643 	      !((LOCAL->buf[i - 4] == '\015') &&
644 		(LOCAL->buf[i - 3] == '\012') &&
645 		(LOCAL->buf[i - 2] == '\015') &&
646 		(LOCAL->buf[i - 1] == '\012')); i++);
647 				/* copy header */
648     cpytxt (&elt->private.msg.header.text,LOCAL->buf,i);
649     cpytxt (&elt->private.msg.text.text,LOCAL->buf+i,elt->rfc822_size - i);
650 				/* add to cached size */
651     LOCAL->cachedtexts += elt->rfc822_size;
652   }
653   *length = elt->private.msg.header.text.size;
654   return (char *) elt->private.msg.header.text.data;
655 }
656 
657 /* MX mail fetch message text (body only)
658  * Accepts: MAIL stream
659  *	    message # to fetch
660  *	    pointer to returned stringstruct
661  *	    option flags
662  * Returns: T on success, NIL on failure
663  */
664 
mx_text(MAILSTREAM * stream,unsigned long msgno,STRING * bs,long flags)665 long mx_text (MAILSTREAM *stream,unsigned long msgno,STRING *bs,long flags)
666 {
667   unsigned long i;
668   MESSAGECACHE *elt;
669 				/* UID call "impossible" */
670   if (flags & FT_UID) return NIL;
671   elt = mail_elt (stream,msgno);
672 				/* snarf message if don't have it yet */
673   if (!elt->private.msg.text.text.data) {
674     mx_header (stream,msgno,&i,flags);
675     if (!elt->private.msg.text.text.data) return NIL;
676   }
677 				/* mark as seen */
678   if (!(flags & FT_PEEK) && mx_lockindex (stream)) {
679     elt->seen = T;
680     mx_unlockindex (stream);
681     MM_FLAGS (stream,msgno);
682   }
683   INIT (bs,mail_string,elt->private.msg.text.text.data,
684 	elt->private.msg.text.text.size);
685   return T;
686 }
687 
688 /* MX mail modify flags
689  * Accepts: MAIL stream
690  *	    sequence
691  *	    flag(s)
692  *	    option flags
693  */
694 
mx_flag(MAILSTREAM * stream,char * sequence,char * flag,long flags)695 void mx_flag (MAILSTREAM *stream,char *sequence,char *flag,long flags)
696 {
697   mx_unlockindex (stream);	/* finished with index */
698 }
699 
700 
701 /* MX per-message modify flags
702  * Accepts: MAIL stream
703  *	    message cache element
704  */
705 
mx_flagmsg(MAILSTREAM * stream,MESSAGECACHE * elt)706 void mx_flagmsg (MAILSTREAM *stream,MESSAGECACHE *elt)
707 {
708   mx_lockindex (stream);	/* lock index if not already locked */
709 }
710 
711 /* MX mail ping mailbox
712  * Accepts: MAIL stream
713  * Returns: T if stream alive, else NIL
714  */
715 
mx_ping(MAILSTREAM * stream)716 long mx_ping (MAILSTREAM *stream)
717 {
718   MAILSTREAM *sysibx = NIL;
719   MESSAGECACHE *elt,*selt;
720   struct stat sbuf;
721   char *s,tmp[MAILTMPLEN];
722   int fd;
723   unsigned long i,j,r,old;
724   long nmsgs = stream->nmsgs;
725   long recent = stream->recent;
726   int silent = stream->silent;
727   if (stat (stream->mailbox,&sbuf)) return NIL;
728   stream->silent = T;		/* don't pass up exists events yet */
729   if (sbuf.st_ctime != LOCAL->scantime) {
730     struct direct **names = NIL;
731     long nfiles = scandir (stream->mailbox,&names,mx_select,mx_numsort);
732     if (nfiles < 0) nfiles = 0;	/* in case error */
733     old = stream->uid_last;
734 				/* note scanned now */
735     LOCAL->scantime = sbuf.st_ctime;
736 				/* scan directory */
737     for (i = 0; i < nfiles; ++i) {
738 				/* if newly seen, add to list */
739       if ((j = atoi (names[i]->d_name)) > old) {
740 				/* swell the cache */
741 	mail_exists (stream,++nmsgs);
742 	stream->uid_last = (elt = mail_elt (stream,nmsgs))->private.uid = j;
743 	elt->valid = T;		/* note valid flags */
744 	if (old) {		/* other than the first pass? */
745 	  elt->recent = T;	/* yup, mark as recent */
746 	  recent++;		/* bump recent count */
747 	}
748       }
749       fs_give ((void **) &names[i]);
750     }
751 				/* free directory */
752     if (s = (void *) names) fs_give ((void **) &s);
753   }
754   stream->nmsgs = nmsgs;	/* don't upset mail_uid() */
755 
756 				/* if INBOX, snarf from system INBOX  */
757   if (mx_lockindex (stream) && stream->inbox &&
758       !strcmp (sysinbox (),stream->mailbox)) {
759     old = stream->uid_last;
760     MM_CRITICAL (stream);	/* go critical */
761 				/* see if anything in system inbox */
762     if (!stat (sysinbox (),&sbuf) && sbuf.st_size &&
763 	(sysibx = mail_open (sysibx,sysinbox (),OP_SILENT)) &&
764 	!sysibx->rdonly && (r = sysibx->nmsgs)) {
765       for (i = 1; i <= r; ++i) {/* for each message in sysinbox mailbox */
766 				/* build file name we will use */
767 	sprintf (LOCAL->buf,"%s/%lu",stream->mailbox,++old);
768 				/* snarf message from Berkeley mailbox */
769 	selt = mail_elt (sysibx,i);
770 	if (((fd = open (LOCAL->buf,O_WRONLY|O_CREAT|O_EXCL,
771 			 (long) mail_parameters (NIL,GET_MBXPROTECTION,NIL)))
772 	     >= 0) &&
773 	    (s = mail_fetchheader_full (sysibx,i,NIL,&j,FT_PEEK)) &&
774 	    (write (fd,s,j) == j) &&
775 	    (s = mail_fetchtext_full (sysibx,i,&j,FT_PEEK)) &&
776 	    (write (fd,s,j) == j) && !fsync (fd) && !close (fd)) {
777 				/* swell the cache */
778 	  mail_exists (stream,++nmsgs);
779 	  stream->uid_last =	/* create new elt, note its file number */
780 	    (elt = mail_elt (stream,nmsgs))->private.uid = old;
781 	  recent++;		/* bump recent count */
782 				/* set up initial flags and date */
783 	  elt->valid = elt->recent = T;
784 	  elt->seen = selt->seen;
785 	  elt->deleted = selt->deleted;
786 	  elt->flagged = selt->flagged;
787 	  elt->answered = selt->answered;
788 	  elt->draft = selt->draft;
789 	  elt->day = selt->day;elt->month = selt->month;elt->year = selt->year;
790 	  elt->hours = selt->hours;elt->minutes = selt->minutes;
791 	  elt->seconds = selt->seconds;
792 	  elt->zhours = selt->zhours; elt->zminutes = selt->zminutes;
793 	  elt->zoccident = selt->zoccident;
794 	  mx_setdate (LOCAL->buf,elt);
795 	  sprintf (tmp,"%lu",i);/* delete it from the sysinbox */
796 	  mail_flag (sysibx,tmp,"\\Deleted",ST_SET);
797 	}
798 	else {			/* failed to snarf */
799 	  if (fd) {		/* did it ever get opened? */
800 	    close (fd);		/* close descriptor */
801 	    unlink (LOCAL->buf);/* flush this file */
802 	  }
803 	  sprintf (tmp,"Message copy to MX mailbox failed: %.80s",
804 		   s,strerror (errno));
805 	  MM_LOG (tmp,ERROR);
806 	  r = 0;		/* stop the snarf in its tracks */
807 	}
808       }
809 				/* update scan time */
810       if (!stat (stream->mailbox,&sbuf)) LOCAL->scantime = sbuf.st_ctime;
811       mail_expunge (sysibx);	/* now expunge all those messages */
812     }
813     if (sysibx) mail_close (sysibx);
814     MM_NOCRITICAL (stream);	/* release critical */
815   }
816   mx_unlockindex (stream);	/* done with index */
817   stream->silent = silent;	/* can pass up events now */
818   mail_exists (stream,nmsgs);	/* notify upper level of mailbox size */
819   mail_recent (stream,recent);
820   return T;			/* return that we are alive */
821 }
822 
823 /* MX mail check mailbox
824  * Accepts: MAIL stream
825  */
826 
mx_check(MAILSTREAM * stream)827 void mx_check (MAILSTREAM *stream)
828 {
829   if (mx_ping (stream)) MM_LOG ("Check completed",(long) NIL);
830 }
831 
832 
833 /* MX mail expunge mailbox
834  * Accepts: MAIL stream
835  *	    sequence to expunge if non-NIL
836  *	    expunge options
837  * Returns: T, always
838  */
839 
mx_expunge(MAILSTREAM * stream,char * sequence,long options)840 long mx_expunge (MAILSTREAM *stream,char *sequence,long options)
841 {
842   long ret;
843   MESSAGECACHE *elt;
844   unsigned long i = 1;
845   unsigned long n = 0;
846   unsigned long recent = stream->recent;
847   if (ret = (sequence ? ((options & EX_UID) ?
848 			 mail_uid_sequence (stream,sequence) :
849 			 mail_sequence (stream,sequence)) : LONGT) &&
850       mx_lockindex (stream)) {	/* lock the index */
851     MM_CRITICAL (stream);	/* go critical */
852     while (i <= stream->nmsgs) {/* for each message */
853       elt = mail_elt (stream,i);/* if deleted, need to trash it */
854       if (elt->deleted && (sequence ? elt->sequence : T)) {
855 	sprintf (LOCAL->buf,"%s/%lu",stream->mailbox,elt->private.uid);
856 	if (unlink (LOCAL->buf)) {/* try to delete the message */
857 	  sprintf (LOCAL->buf,"Expunge of message %lu failed, aborted: %s",i,
858 		   strerror (errno));
859 	  MM_LOG (LOCAL->buf,(long) NIL);
860 	  break;
861 	}
862 				/* note uncached */
863 	LOCAL->cachedtexts -= ((elt->private.msg.header.text.data ?
864 				elt->private.msg.header.text.size : 0) +
865 			       (elt->private.msg.text.text.data ?
866 				elt->private.msg.text.text.size : 0));
867 	mail_gc_msg (&elt->private.msg,GC_ENV | GC_TEXTS);
868 	if(elt->recent)--recent;/* if recent, note one less recent message */
869 	mail_expunged(stream,i);/* notify upper levels */
870 	n++;			/* count up one more expunged message */
871       }
872       else i++;			/* otherwise try next message */
873     }
874     if (n) {			/* output the news if any expunged */
875       sprintf (LOCAL->buf,"Expunged %lu messages",n);
876       MM_LOG (LOCAL->buf,(long) NIL);
877     }
878     else MM_LOG ("No messages deleted, so no update needed",(long) NIL);
879     MM_NOCRITICAL (stream);	/* release critical */
880     mx_unlockindex (stream);	/* finished with index */
881 				/* notify upper level of new mailbox size */
882     mail_exists (stream,stream->nmsgs);
883     mail_recent (stream,recent);
884   }
885   return ret;
886 }
887 
888 /* MX mail copy message(s)
889  * Accepts: MAIL stream
890  *	    sequence
891  *	    destination mailbox
892  *	    copy options
893  * Returns: T if copy successful, else NIL
894  */
895 
mx_copy(MAILSTREAM * stream,char * sequence,char * mailbox,long options)896 long mx_copy (MAILSTREAM *stream,char *sequence,char *mailbox,long options)
897 {
898   FDDATA d;
899   STRING st;
900   MESSAGECACHE *elt;
901   MAILSTREAM *astream;
902   struct stat sbuf;
903   int fd;
904   unsigned long i,j,uid,uidv;
905   char *t,tmp[MAILTMPLEN];
906   long ret;
907   mailproxycopy_t pc =
908     (mailproxycopy_t) mail_parameters (stream,GET_MAILPROXYCOPY,NIL);
909 				/* make sure valid mailbox */
910   if (!mx_valid (mailbox)) switch (errno) {
911   case NIL:			/* no error in stat() */
912     if (pc) return (*pc) (stream,sequence,mailbox,options);
913     sprintf (LOCAL->buf,"Not a MX-format mailbox: %.80s",mailbox);
914     MM_LOG (LOCAL->buf,ERROR);
915     return NIL;
916   default:			/* some stat() error */
917     MM_NOTIFY (stream,"[TRYCREATE] Must create mailbox before copy",NIL);
918     return NIL;
919   }
920 				/* copy the messages */
921   if (!(ret = ((options & CP_UID) ? mail_uid_sequence (stream,sequence) :
922 	       mail_sequence (stream,sequence))));
923 				/* acquire stream to append to */
924   else if (!(astream = mail_open (NIL,mailbox,OP_SILENT))) {
925     MM_LOG ("Can't open copy mailbox",ERROR);
926     ret = NIL;
927   }
928   else {
929     MM_CRITICAL (stream);	/* go critical */
930     if (!(ret = mx_lockindex (astream)))
931       MM_LOG ("Message copy failed: unable to lock index",ERROR);
932     else {
933 
934       copyuid_t cu = (copyuid_t) mail_parameters (NIL,GET_COPYUID,NIL);
935       SEARCHSET *source = cu ? mail_newsearchset () : NIL;
936       SEARCHSET *dest = cu ? mail_newsearchset () : NIL;
937       for (i = 1,uid = uidv = 0; ret && (i <= stream->nmsgs); i++)
938       if ((elt = mail_elt (stream,i))->sequence) {
939 	if (ret = ((fd = open (mx_fast_work (stream,elt),O_RDONLY,NIL))
940 		   >= 0)) {
941 	  fstat (fd,&sbuf);	/* get size of message */
942 	  d.fd = fd;		/* set up file descriptor */
943 	  d.pos = 0;		/* start of file */
944 	  d.chunk = LOCAL->buf;
945 	  d.chunksize = CHUNKSIZE;
946 	  INIT (&st,fd_string,&d,sbuf.st_size);
947 				/* init flag string */
948 	  tmp[0] = tmp[1] = '\0';
949 	  if (j = elt->user_flags) do
950 	    if (t = stream->user_flags[find_rightmost_bit (&j)])
951 	      strcat (strcat (tmp," "),t);
952 	  while (j);
953 	  if (elt->seen) strcat (tmp," \\Seen");
954 	  if (elt->deleted) strcat (tmp," \\Deleted");
955 	  if (elt->flagged) strcat (tmp," \\Flagged");
956 	  if (elt->answered) strcat (tmp," \\Answered");
957 	  if (elt->draft) strcat (tmp," \\Draft");
958 	  tmp[0] = '(';		/* open list */
959 	  strcat (tmp,")");	/* close list */
960 	  if (ret = mx_append_msg (astream,tmp,elt,&st,dest)) {
961 				/* add to source set if needed */
962 	    if (source) mail_append_set (source,mail_uid (stream,i));
963 				/* delete if doing a move */
964 	    if (options & CP_MOVE) elt->deleted = T;
965 	  }
966 	}
967       }
968 				/* return sets if doing COPYUID */
969       if (cu && ret) (*cu) (stream,mailbox,astream->uid_validity,source,dest);
970       else {			/* flush any sets we may have built */
971 	mail_free_searchset (&source);
972 	mail_free_searchset (&dest);
973       }
974       mx_unlockindex (astream);	/* unlock index */
975     }
976     MM_NOCRITICAL (stream);
977     mail_close (astream);	/* finished with append stream */
978   }
979   return ret;			/* return success */
980 }
981 
982 /* MX mail append message from stringstruct
983  * Accepts: MAIL stream
984  *	    destination mailbox
985  *	    append callback
986  *	    data for callback
987  * Returns: T if append successful, else NIL
988  */
989 
mx_append(MAILSTREAM * stream,char * mailbox,append_t af,void * data)990 long mx_append (MAILSTREAM *stream,char *mailbox,append_t af,void *data)
991 {
992   MESSAGECACHE elt;
993   MAILSTREAM *astream;
994   char *flags,*date,tmp[MAILTMPLEN];
995   STRING *message;
996   long ret = LONGT;
997 				/* default stream to prototype */
998   if (!stream) stream = user_flags (&mxproto);
999 				/* N.B.: can't use LOCAL->buf for tmp */
1000 				/* make sure valid mailbox */
1001   if (!mx_isvalid (mailbox,tmp)) switch (errno) {
1002   case ENOENT:			/* no such file? */
1003     if (!compare_cstring (mailbox,"INBOX")) mx_create (NIL,"INBOX");
1004     else {
1005       MM_NOTIFY (stream,"[TRYCREATE] Must create mailbox before append",NIL);
1006       return NIL;
1007     }
1008 				/* falls through */
1009   case 0:			/* merely empty file? */
1010     break;
1011   case EINVAL:
1012     sprintf (tmp,"Invalid MX-format mailbox name: %.80s",mailbox);
1013     MM_LOG (tmp,ERROR);
1014     return NIL;
1015   default:
1016     sprintf (tmp,"Not a MX-format mailbox: %.80s",mailbox);
1017     MM_LOG (tmp,ERROR);
1018     return NIL;
1019   }
1020 
1021 				/* get first message */
1022   if (!MM_APPEND (af) (stream,data,&flags,&date,&message)) return NIL;
1023   if (!(astream = mail_open (NIL,mailbox,OP_SILENT))) {
1024     MM_LOG ("Can't open append mailbox",ERROR);
1025     return NIL;
1026   }
1027   MM_CRITICAL (astream);	/* go critical */
1028 				/* lock the index */
1029   if (!(ret = mx_lockindex (astream)))
1030     MM_LOG ("Message append failed: unable to lock index",ERROR);
1031   else {
1032     appenduid_t au = (appenduid_t) mail_parameters (NIL,GET_APPENDUID,NIL);
1033     SEARCHSET *dst = au ? mail_newsearchset () : NIL;
1034     do {
1035 				/* guard against zero-length */
1036       if (!(ret = SIZE (message)))
1037 	MM_LOG ("Append of zero-length message",ERROR);
1038       else if (date && !(ret = mail_parse_date (&elt,date))) {
1039 	sprintf (tmp,"Bad date in append: %.80s",date);
1040 	MM_LOG (tmp,ERROR);
1041       }
1042       else ret = mx_append_msg (astream,flags,date ? &elt : NIL,message,dst)&&
1043 	     MM_APPEND (af) (stream,data,&flags,&date,&message);
1044     } while (ret && message);
1045 				/* return sets if doing APPENDUID */
1046     if (au && ret) (*au) (mailbox,astream->uid_validity,dst);
1047     else mail_free_searchset (&dst);
1048     mx_unlockindex (astream);	/* unlock index */
1049   }
1050   MM_NOCRITICAL (astream);	/* release critical */
1051   mail_close (astream);
1052   return ret;
1053 }
1054 
1055 /* MX mail append single message
1056  * Accepts: MAIL stream
1057  *	    flags for new message if non-NIL
1058  *	    elt with source date if non-NIL
1059  *	    stringstruct of message text
1060  *	    searchset to place UID
1061  * Returns: T if success, NIL if failure
1062  */
1063 
mx_append_msg(MAILSTREAM * stream,char * flags,MESSAGECACHE * elt,STRING * st,SEARCHSET * set)1064 long mx_append_msg (MAILSTREAM *stream,char *flags,MESSAGECACHE *elt,
1065 		    STRING *st,SEARCHSET *set)
1066 {
1067   char tmp[MAILTMPLEN];
1068   int fd;
1069   unsigned long uf;
1070   long f = mail_parse_flags (stream,flags,&uf);
1071 				/* make message file name */
1072   sprintf (tmp,"%s/%lu",stream->mailbox,++stream->uid_last);
1073   if ((fd = open (tmp,O_WRONLY|O_CREAT|O_EXCL,
1074 		  (long) mail_parameters (NIL,GET_MBXPROTECTION,NIL))) < 0) {
1075     sprintf (tmp,"Can't create append message: %s",strerror (errno));
1076     MM_LOG (tmp,ERROR);
1077     return NIL;
1078   }
1079   while (SIZE (st)) {		/* copy the file */
1080     if (st->cursize && (write (fd,st->curpos,st->cursize) < 0)) {
1081       unlink (tmp);		/* delete file */
1082       close (fd);		/* close the file */
1083       sprintf (tmp,"Message append failed: %s",strerror (errno));
1084       MM_LOG (tmp,ERROR);
1085       return NIL;
1086     }
1087     SETPOS (st,GETPOS (st) + st->cursize);
1088   }
1089   close (fd);			/* close the file */
1090   if (elt) mx_setdate (tmp,elt);/* set file date */
1091 				/* swell the cache */
1092   mail_exists (stream,++stream->nmsgs);
1093 				/* copy flags */
1094   mail_append_set (set,(elt = mail_elt (stream,stream->nmsgs))->private.uid =
1095 		   stream->uid_last);
1096   if (f&fSEEN) elt->seen = T;
1097   if (f&fDELETED) elt->deleted = T;
1098   if (f&fFLAGGED) elt->flagged = T;
1099   if (f&fANSWERED) elt->answered = T;
1100   if (f&fDRAFT) elt->draft = T;
1101   elt->user_flags |= uf;
1102   return LONGT;
1103 }
1104 
1105 /* Internal routines */
1106 
1107 
1108 /* MX file name selection test
1109  * Accepts: candidate directory entry
1110  * Returns: T to use file name, NIL to skip it
1111  */
1112 
mx_select(struct direct * name)1113 int mx_select (struct direct *name)
1114 {
1115   char c;
1116   char *s = name->d_name;
1117   while (c = *s++) if (!isdigit (c)) return NIL;
1118   return T;
1119 }
1120 
1121 
1122 /* MX file name comparision
1123  * Accepts: first candidate directory entry
1124  *	    second candidate directory entry
1125  * Returns: negative if d1 < d2, 0 if d1 == d2, postive if d1 > d2
1126  */
1127 
mx_numsort(const void * d1,const void * d2)1128 int mx_numsort (const void *d1,const void *d2)
1129 {
1130   return atoi ((*(struct direct **) d1)->d_name) -
1131     atoi ((*(struct direct **) d2)->d_name);
1132 }
1133 
1134 
1135 /* MX mail build file name
1136  * Accepts: destination string
1137  *          source
1138  * Returns: destination
1139  */
1140 
mx_file(char * dst,char * name)1141 char *mx_file (char *dst,char *name)
1142 {
1143   char *s;
1144 				/* empty string if mailboxfile fails */
1145   if (!mailboxfile (dst,name)) *dst = '\0';
1146 				/* driver-selected INBOX  */
1147   else if (!*dst) mailboxfile (dst,"~/INBOX");
1148 				/* tie off unnecessary trailing / */
1149   else if ((s = strrchr (dst,'/')) && !s[1]) *s = '\0';
1150   return dst;
1151 }
1152 
1153 /* MX read and lock index
1154  * Accepts: MAIL stream
1155  * Returns: T if success, NIL if failure
1156  */
1157 
mx_lockindex(MAILSTREAM * stream)1158 long mx_lockindex (MAILSTREAM *stream)
1159 {
1160   unsigned long uf,sf,uid;
1161   int k = 0;
1162   unsigned long msgno = 1;
1163   struct stat sbuf;
1164   char *s,*t,*idx,tmp[2*MAILTMPLEN];
1165   MESSAGECACHE *elt;
1166   blocknotify_t bn = (blocknotify_t) mail_parameters (NIL,GET_BLOCKNOTIFY,NIL);
1167   if ((LOCAL->fd < 0) &&	/* get index file, no-op if already have it */
1168       (LOCAL->fd = open (strcat (strcpy (tmp,stream->mailbox),MXINDEXNAME),
1169 			 O_RDWR|O_CREAT,
1170 			 (long) mail_parameters (NIL,GET_MBXPROTECTION,NIL)))
1171       >= 0) {
1172     (*bn) (BLOCK_FILELOCK,NIL);
1173     flock (LOCAL->fd,LOCK_EX);	/* get exclusive lock */
1174     (*bn) (BLOCK_NONE,NIL);
1175     fstat (LOCAL->fd,&sbuf);	/* get size of index */
1176 				/* slurp index */
1177     read (LOCAL->fd,s = idx = (char *) fs_get (sbuf.st_size + 1),sbuf.st_size);
1178     idx[sbuf.st_size] = '\0';	/* tie off index */
1179 				/* parse index */
1180     if (sbuf.st_size) while (s && *s) switch (*s) {
1181     case 'V':			/* UID validity record */
1182       stream->uid_validity = strtoul (s+1,&s,16);
1183       break;
1184     case 'L':			/* UID last record */
1185       stream->uid_last = strtoul (s+1,&s,16);
1186       break;
1187     case 'K':			/* keyword */
1188 				/* find end of keyword */
1189       if (s = strchr (t = ++s,'\n')) {
1190 	*s++ = '\0';		/* tie off keyword */
1191 				/* copy keyword */
1192 	if ((k < NUSERFLAGS) && !stream->user_flags[k] &&
1193 	    (strlen (t) <= MAXUSERFLAG)) stream->user_flags[k] = cpystr (t);
1194 	k++;			/* one more keyword */
1195       }
1196       break;
1197 
1198     case 'M':			/* message status record */
1199       uid = strtoul (s+1,&s,16);/* get UID for this message */
1200       if (*s == ';') {		/* get user flags */
1201 	uf = strtoul (s+1,&s,16);
1202 	if (*s == '.') {	/* get system flags */
1203 	  sf = strtoul (s+1,&s,16);
1204 	  while ((msgno <= stream->nmsgs) && (mail_uid (stream,msgno) < uid))
1205 	    msgno++;		/* find message number for this UID */
1206 	  if ((msgno <= stream->nmsgs) && (mail_uid (stream,msgno) == uid)) {
1207 	    (elt = mail_elt (stream,msgno))->valid = T;
1208 	    elt->user_flags=uf; /* set user and system flags in elt */
1209 	    if (sf & fSEEN) elt->seen = T;
1210 	    if (sf & fDELETED) elt->deleted = T;
1211 	    if (sf & fFLAGGED) elt->flagged = T;
1212 	    if (sf & fANSWERED) elt->answered = T;
1213 	    if (sf & fDRAFT) elt->draft = T;
1214 	  }
1215 	  break;
1216 	}
1217       }
1218     default:			/* bad news */
1219       sprintf (tmp,"Error in index: %.80s",s);
1220       MM_LOG (tmp,ERROR);
1221       *s = NIL;			/* ignore remainder of index */
1222     }
1223     else {			/* new index */
1224       stream->uid_validity = time (0);
1225       user_flags (stream);	/* init stream with default user flags */
1226     }
1227     fs_give ((void **) &idx);	/* flush index */
1228   }
1229   return (LOCAL->fd >= 0) ? T : NIL;
1230 }
1231 
1232 /* MX write and unlock index
1233  * Accepts: MAIL stream
1234  */
1235 
1236 #define MXIXBUFLEN 2048
1237 
mx_unlockindex(MAILSTREAM * stream)1238 void mx_unlockindex (MAILSTREAM *stream)
1239 {
1240   unsigned long i,j;
1241   off_t size = 0;
1242   char *s,tmp[MXIXBUFLEN + 64];
1243   MESSAGECACHE *elt;
1244   if (LOCAL->fd >= 0) {
1245     lseek (LOCAL->fd,0,L_SET);	/* rewind file */
1246 				/* write header */
1247     sprintf (s = tmp,"V%08lxL%08lx",stream->uid_validity,stream->uid_last);
1248     for (i = 0; (i < NUSERFLAGS) && stream->user_flags[i]; ++i)
1249       sprintf (s += strlen (s),"K%s\n",stream->user_flags[i]);
1250 				/* write messages */
1251     for (i = 1; i <= stream->nmsgs; i++) {
1252 				/* filled buffer? */
1253       if (((s += strlen (s)) - tmp) > MXIXBUFLEN) {
1254 	write (LOCAL->fd,tmp,j = s - tmp);
1255 	size += j;
1256 	*(s = tmp) = '\0';	/* dump out and restart buffer */
1257       }
1258       elt = mail_elt (stream,i);
1259       sprintf(s,"M%08lx;%08lx.%04x",elt->private.uid,elt->user_flags,(unsigned)
1260 	      ((fSEEN * elt->seen) + (fDELETED * elt->deleted) +
1261 	       (fFLAGGED * elt->flagged) + (fANSWERED * elt->answered) +
1262 	       (fDRAFT * elt->draft)));
1263     }
1264 				/* write tail end of buffer */
1265     if ((s += strlen (s)) != tmp) {
1266       write (LOCAL->fd,tmp,j = s - tmp);
1267       size += j;
1268     }
1269     ftruncate (LOCAL->fd,size);
1270     flock (LOCAL->fd,LOCK_UN);	/* unlock the index */
1271     close (LOCAL->fd);		/* finished with file */
1272     LOCAL->fd = -1;		/* no index now */
1273   }
1274 }
1275 
1276 /* Set date for message
1277  * Accepts: file name
1278  *	    elt containing date
1279  */
1280 
mx_setdate(char * file,MESSAGECACHE * elt)1281 void mx_setdate (char *file,MESSAGECACHE *elt)
1282 {
1283   time_t tp[2];
1284   tp[0] = time (0);		/* atime is now */
1285   tp[1] = mail_longdate (elt);	/* modification time */
1286   utime (file,tp);		/* set the times */
1287 }
1288