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mtxnt.c
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C/C++ Source or Header
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1999-01-06
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37KB
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1,102 lines
/*
* Program: MTX mail routines
*
* Author: Mark Crispin
* Networks and Distributed Computing
* Computing & Communications
* University of Washington
* Administration Building, AG-44
* Seattle, WA 98195
* Internet: MRC@CAC.Washington.EDU
*
* Date: 22 May 1990
* Last Edited: 6 January 1999
*
* Copyright 1999 by the University of Washington
*
* Permission to use, copy, modify, and distribute this software and its
* documentation for any purpose and without fee is hereby granted, provided
* that the above copyright notice appears in all copies and that both the
* above copyright notice and this permission notice appear in supporting
* documentation, and that the name of the University of Washington not be
* used in advertising or publicity pertaining to distribution of the software
* without specific, written prior permission. This software is made
* available "as is", and
* THE UNIVERSITY OF WASHINGTON DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED,
* WITH REGARD TO THIS SOFTWARE, INCLUDING WITHOUT LIMITATION ALL IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, AND IN
* NO EVENT SHALL THE UNIVERSITY OF WASHINGTON BE LIABLE FOR ANY SPECIAL,
* INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, TORT
* (INCLUDING NEGLIGENCE) OR STRICT LIABILITY, ARISING OUT OF OR IN CONNECTION
* WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
*/
#include <stdio.h>
#include <ctype.h>
#include <errno.h>
extern int errno; /* just in case */
#include "mail.h"
#include "osdep.h"
#include <fcntl.h>
#include <time.h>
#include <sys/stat.h>
#include <sys/utime.h>
#include "mtxnt.h"
#include "misc.h"
#include "dummy.h"
/* MTX mail routines */
/* Driver dispatch used by MAIL */
DRIVER mtxdriver = {
"mtx", /* driver name */
/* driver flags */
DR_LOCAL|DR_MAIL|DR_CRLF|DR_NOSTICKY,
(DRIVER *) NIL, /* next driver */
mtx_valid, /* mailbox is valid for us */
mtx_parameters, /* manipulate parameters */
mtx_scan, /* scan mailboxes */
mtx_list, /* list mailboxes */
mtx_lsub, /* list subscribed mailboxes */
NIL, /* subscribe to mailbox */
NIL, /* unsubscribe from mailbox */
mtx_create, /* create mailbox */
mtx_delete, /* delete mailbox */
mtx_rename, /* rename mailbox */
NIL, /* status of mailbox */
mtx_open, /* open mailbox */
mtx_close, /* close mailbox */
mtx_flags, /* fetch message "fast" attributes */
mtx_flags, /* fetch message flags */
NIL, /* fetch overview */
NIL, /* fetch message envelopes */
mtx_header, /* fetch message header */
mtx_text, /* fetch message body */
NIL, /* fetch partial message text */
NIL, /* unique identifier */
NIL, /* message number */
mtx_flag, /* modify flags */
mtx_flagmsg, /* per-message modify flags */
NIL, /* search for message based on criteria */
NIL, /* sort messages */
NIL, /* thread messages */
mtx_ping, /* ping mailbox to see if still alive */
mtx_check, /* check for new messages */
mtx_expunge, /* expunge deleted messages */
mtx_copy, /* copy messages to another mailbox */
mtx_append, /* append string message to mailbox */
NIL /* garbage collect stream */
};
/* prototype stream */
MAILSTREAM mtxproto = {&mtxdriver};
/* MTX mail validate mailbox
* Accepts: mailbox name
* Returns: our driver if name is valid, NIL otherwise
*/
DRIVER *mtx_valid (char *name)
{
char tmp[MAILTMPLEN];
return mtx_isvalid (name,tmp) ? &mtxdriver : NIL;
}
/* MTX mail test for valid mailbox
* Accepts: mailbox name
* Returns: T if valid, NIL otherwise
*/
int mtx_isvalid (char *name,char *tmp)
{
int fd;
int ret = NIL;
char *s,file[MAILTMPLEN];
struct stat sbuf;
struct utimbuf times;
errno = EINVAL; /* assume invalid argument */
/* if file, get its status */
if ((s = mailboxfile (file,name)) && !stat (s,&sbuf) &&
((sbuf.st_mode & S_IFMT) == S_IFREG)) {
if (!sbuf.st_size)errno = 0;/* empty file */
else if ((fd = open (file,O_BINARY|O_RDONLY,NIL)) >= 0) {
memset (tmp,'\0',MAILTMPLEN);
if ((read (fd,tmp,64) >= 0) && (s = strchr (tmp,'\015')) &&
(s[1] == '\012')) { /* valid format? */
*s = '\0'; /* tie off header */
/* must begin with dd-mmm-yy" */
ret = (((tmp[2] == '-' && tmp[6] == '-') ||
(tmp[1] == '-' && tmp[5] == '-')) &&
(s = strchr (tmp+20,',')) && strchr (s+2,';')) ? T : NIL;
}
else errno = -1; /* bogus format */
close (fd); /* close the file */
/* preserve atime and mtime */
times.actime = sbuf.st_atime;
times.modtime = sbuf.st_mtime;
utime (file,×); /* set the times */
}
}
/* in case INBOX but not mtx format */
else if ((errno == ENOENT) && ((name[0] == 'I') || (name[0] == 'i')) &&
((name[1] == 'N') || (name[1] == 'n')) &&
((name[2] == 'B') || (name[2] == 'b')) &&
((name[3] == 'O') || (name[3] == 'o')) &&
((name[4] == 'X') || (name[4] == 'x')) && !name[5]) errno = -1;
return ret; /* return what we should */
}
/* MTX manipulate driver parameters
* Accepts: function code
* function-dependent value
* Returns: function-dependent return value
*/
void *mtx_parameters (long function,void *value)
{
return NIL;
}
/* MTX mail scan mailboxes
* Accepts: mail stream
* reference
* pattern to search
* string to scan
*/
void mtx_scan (MAILSTREAM *stream,char *ref,char *pat,char *contents)
{
if (stream) dummy_scan (NIL,ref,pat,contents);
}
/* MTX mail list mailboxes
* Accepts: mail stream
* reference
* pattern to search
*/
void mtx_list (MAILSTREAM *stream,char *ref,char *pat)
{
if (stream) dummy_list (NIL,ref,pat);
}
/* MTX mail list subscribed mailboxes
* Accepts: mail stream
* reference
* pattern to search
*/
void mtx_lsub (MAILSTREAM *stream,char *ref,char *pat)
{
if (stream) dummy_lsub (NIL,ref,pat);
}
/* MTX mail create mailbox
* Accepts: MAIL stream
* mailbox name to create
* Returns: T on success, NIL on failure
*/
long mtx_create (MAILSTREAM *stream,char *mailbox)
{
return dummy_create (stream,mailbox);
}
/* MTX mail delete mailbox
* Accepts: MAIL stream
* mailbox name to delete
* Returns: T on success, NIL on failure
*/
long mtx_delete (MAILSTREAM *stream,char *mailbox)
{
return mtx_rename (stream,mailbox,NIL);
}
/* MTX mail rename mailbox
* Accepts: MAIL stream
* old mailbox name
* new mailbox name (or NIL for delete)
* Returns: T on success, NIL on failure
*/
long mtx_rename (MAILSTREAM *stream,char *old,char *newname)
{
long ret = T;
char c,*s,tmp[MAILTMPLEN],file[MAILTMPLEN],lock[MAILTMPLEN];
int ld;
int fd = open (mailboxfile (file,old),O_BINARY|O_RDWR,NIL);
struct stat sbuf;
if (fd < 0) { /* open mailbox */
sprintf (tmp,"Can't open mailbox %.80s: %s",old,strerror (errno));
mm_log (tmp,ERROR);
return NIL;
}
/* get exclusive parse/append permission */
if ((ld = lockname (lock,old,LOCK_EX)) < 0) {
mm_log ("Unable to lock rename mailbox",ERROR);
return NIL;
}
/* lock out other users */
if (flock (fd,LOCK_EX|LOCK_NB)) {
close (fd); /* couldn't lock, give up on it then */
sprintf (tmp,"Mailbox %.80s is in use by another process",old);
mm_log (tmp,ERROR);
unlockfd (ld,lock); /* release exclusive parse/append permission */
return NIL;
}
if (newname) { /* want rename? */
if (!((s = mailboxfile (tmp,newname)) && *s)) {
sprintf (tmp,"Can't rename mailbox %.80s to %.80s: invalid name",
old,newname);
mm_log (tmp,ERROR);
ret = NIL; /* set failure */
}
if (s = strrchr (s,'\\')) { /* found superior to destination name? */
c = *++s; /* remember first character of inferior */
*s = '\0'; /* tie off to get just superior */
/* name doesn't exist, create it */
if ((stat (tmp,&sbuf) || ((sbuf.st_mode & S_IFMT) != S_IFDIR)) &&
!dummy_create (stream,tmp)) ret = NIL;
else *s = c; /* restore full name */
}
flock (fd,LOCK_UN); /* release lock on the file */
close (fd); /* pacify NTFS */
/* rename the file */
if (ret && rename (file,tmp)) {
sprintf (tmp,"Can't rename mailbox %.80s to %.80s: %s",old,newname,
strerror (errno));
mm_log (tmp,ERROR);
ret = NIL; /* set failure */
}
}
else {
flock (fd,LOCK_UN); /* release lock on the file */
close (fd); /* pacify NTFS */
if (unlink (file)) {
sprintf (tmp,"Can't delete mailbox %.80s: %.80s",old,strerror (errno));
mm_log (tmp,ERROR);
ret = NIL; /* set failure */
}
}
unlockfd (ld,lock); /* release exclusive parse/append permission */
return ret; /* return success */
}
/* MTX mail open
* Accepts: stream to open
* Returns: stream on success, NIL on failure
*/
MAILSTREAM *mtx_open (MAILSTREAM *stream)
{
int fd,ld;
char tmp[MAILTMPLEN];
/* return prototype for OP_PROTOTYPE call */
if (!stream) return &mtxproto;
if (stream->local) fatal ("mtx recycle stream");
if (stream->rdonly ||
(fd = open (mailboxfile (tmp,stream->mailbox),O_BINARY|O_RDWR,NIL)) < 0){
if ((fd=open(mailboxfile(tmp,stream->mailbox),O_BINARY|O_RDONLY,NIL)) < 0){
sprintf (tmp,"Can't open mailbox: %.80s",strerror (errno));
mm_log (tmp,ERROR);
return NIL;
}
else if (!stream->rdonly) { /* got it, but readonly */
mm_log ("Can't get write access to mailbox, access is readonly",WARN);
stream->rdonly = T;
}
}
stream->local = fs_get (sizeof (MTXLOCAL));
LOCAL->buf = (char *) fs_get (MAXMESSAGESIZE + 1);
LOCAL->buflen = MAXMESSAGESIZE;
fs_give ((void **) &stream->mailbox);
stream->mailbox = cpystr (tmp);
/* get shared parse permission */
if ((ld = lockname (tmp,stream->mailbox,LOCK_SH)) < 0) {
mm_log ("Unable to lock open mailbox",ERROR);
return NIL;
}
flock(LOCAL->fd = fd,LOCK_SH);/* bind and lock the file */
unlockfd (ld,tmp); /* release shared parse permission */
LOCAL->filesize = 0; /* initialize parsed file size */
LOCAL->filetime = 0; /* time not set up yet */
LOCAL->mustcheck = LOCAL->shouldcheck = NIL;
stream->sequence++; /* bump sequence number */
stream->uid_validity = time (0);
/* parse mailbox */
stream->nmsgs = stream->recent = 0;
if (mtx_ping (stream) && !stream->nmsgs)
mm_log ("Mailbox is empty",(long) NIL);
if (!LOCAL) return NIL; /* failure if stream died */
stream->perm_seen = stream->perm_deleted =
stream->perm_flagged = stream->perm_answered = stream->perm_draft =
stream->rdonly ? NIL : T;
stream->perm_user_flags = stream->rdonly ? NIL : 0xffffffff;
return stream; /* return stream to caller */
}
/* MTX mail close
* Accepts: MAIL stream
* close options
*/
void mtx_close (MAILSTREAM *stream,long options)
{
if (stream && LOCAL) { /* only if a file is open */
int silent = stream->silent;
stream->silent = T; /* note this stream is dying */
if (options & CL_EXPUNGE) mtx_expunge (stream);
stream->silent = silent; /* restore previous status */
flock (LOCAL->fd,LOCK_UN); /* unlock local file */
close (LOCAL->fd); /* close the local file */
/* free local text buffer */
if (LOCAL->buf) fs_give ((void **) &LOCAL->buf);
/* nuke the local data */
fs_give ((void **) &stream->local);
stream->dtb = NIL; /* log out the DTB */
}
}
/* MTX mail fetch flags
* Accepts: MAIL stream
* sequence
* option flags
* Sniffs at file to see if some other process changed the flags
*/
void mtx_flags (MAILSTREAM *stream,char *sequence,long flags)
{
unsigned long i;
if (mtx_ping (stream) && /* ping mailbox, get new status for messages */
((flags & FT_UID) ? mail_uid_sequence (stream,sequence) :
mail_sequence (stream,sequence)))
for (i = 1; i <= stream->nmsgs; i++)
if (mail_elt (stream,i)->sequence) mtx_elt (stream,i);
}
/* MTX mail fetch message header
* Accepts: MAIL stream
* message # to fetch
* pointer to returned header text length
* option flags
* Returns: message header in RFC822 format
*/
char *mtx_header (MAILSTREAM *stream,unsigned long msgno,unsigned long *length,
long flags)
{
*length = 0; /* default to empty */
if (flags & FT_UID) return "";/* UID call "impossible" */
/* get to header position */
lseek (LOCAL->fd,mtx_hdrpos (stream,msgno,length),L_SET);
/* is buffer big enough? */
if (*length > LOCAL->buflen) {
fs_give ((void **) &LOCAL->buf);
LOCAL->buf = (char *) fs_get ((LOCAL->buflen = *length) + 1);
}
LOCAL->buf[*length] = '\0'; /* tie off string */
/* slurp the data */
read (LOCAL->fd,LOCAL->buf,*length);
return LOCAL->buf;
}
/* MTX mail fetch message text (body only)
* Accepts: MAIL stream
* message # to fetch
* pointer to returned header text length
* option flags
* Returns: T, always
*/
long mtx_text (MAILSTREAM *stream,unsigned long msgno,STRING *bs,long flags)
{
unsigned long i,j;
MESSAGECACHE *elt;
/* UID call "impossible" */
if (flags & FT_UID) return NIL;
elt = mtx_elt (stream,msgno); /* get message status */
/* if message not seen */
if (!(flags & FT_PEEK) && !elt->seen) {
elt->seen = T; /* mark message as seen */
/* recalculate status */
mtx_update_status (stream,msgno,T);
mm_flags (stream,msgno);
}
/* find header position */
i = mtx_hdrpos (stream,msgno,&j);
/* go to text position */
lseek (LOCAL->fd,i + j,L_SET);
/* is buffer big enough? */
if ((i = elt->rfc822_size - j) > LOCAL->buflen) {
fs_give ((void **) &LOCAL->buf);
LOCAL->buf = (char *) fs_get ((LOCAL->buflen = i) + 1);
}
read (LOCAL->fd,LOCAL->buf,i);/* slurp the data */
LOCAL->buf[i] = '\0'; /* tie off string */
/* set up stringstruct */
INIT (bs,mail_string,LOCAL->buf,i);
return T; /* success */
}
/* MTX mail modify flags
* Accepts: MAIL stream
* sequence
* flag(s)
* option flags
*/
void mtx_flag (MAILSTREAM *stream,char *sequence,char *flag,long flags)
{
struct stat sbuf;
if (!stream->rdonly) { /* make sure the update takes */
fsync (LOCAL->fd);
fstat (LOCAL->fd,&sbuf); /* get current write time */
LOCAL->filetime = sbuf.st_mtime;
}
}
/* MTX mail per-message modify flags
* Accepts: MAIL stream
* message cache element
*/
void mtx_flagmsg (MAILSTREAM *stream,MESSAGECACHE *elt)
{
struct stat sbuf;
/* maybe need to do a checkpoint? */
if (LOCAL->filetime && !LOCAL->shouldcheck) {
fstat (LOCAL->fd,&sbuf); /* get current write time */
if (LOCAL->filetime < sbuf.st_mtime) LOCAL->shouldcheck = T;
LOCAL->filetime = 0; /* don't do this test for any other messages */
}
/* recalculate status */
mtx_update_status (stream,elt->msgno,NIL);
}
/* MTX mail ping mailbox
* Accepts: MAIL stream
* Returns: T if stream still alive, NIL if not
*/
long mtx_ping (MAILSTREAM *stream)
{
unsigned long i = 1;
long r = T;
int ld;
char lock[MAILTMPLEN];
struct stat sbuf;
if (stream && LOCAL) { /* only if stream already open */
fstat (LOCAL->fd,&sbuf); /* get current file poop */
if (LOCAL->filetime && !(LOCAL->mustcheck || LOCAL->shouldcheck) &&
(LOCAL->filetime < sbuf.st_mtime)) LOCAL->shouldcheck = T;
/* check for changed message status */
if (LOCAL->mustcheck || LOCAL->shouldcheck) {
if (LOCAL->shouldcheck) /* babble when we do this unilaterally */
mm_notify (stream,"[CHECK] Checking for flag updates",NIL);
while (i <= stream->nmsgs) mtx_elt (stream,i++);
LOCAL->mustcheck = LOCAL->shouldcheck = NIL;
}
/* get shared parse/append permission */
if ((sbuf.st_size != LOCAL->filesize) &&
((ld = lockname (lock,stream->mailbox,LOCK_SH)) >= 0)) {
/* parse resulting mailbox */
r = (mtx_parse (stream)) ? T : NIL;
unlockfd (ld,lock); /* release shared parse/append permission */
}
else if ((sbuf.st_ctime > sbuf.st_atime)||(sbuf.st_ctime > sbuf.st_mtime)){
struct utimbuf times; /* whack the times if necessary */
LOCAL->filetime = times.actime = times.modtime = time (0);
utime (stream->mailbox,×);
}
}
return r; /* return result of the parse */
}
/* MTX mail check mailbox (reparses status too)
* Accepts: MAIL stream
*/
void mtx_check (MAILSTREAM *stream)
{
/* mark that a check is desired */
if (LOCAL) LOCAL->mustcheck = T;
if (mtx_ping (stream)) mm_log ("Check completed",(long) NIL);
}
/* MTX mail expunge mailbox
* Accepts: MAIL stream
*/
void mtx_expunge (MAILSTREAM *stream)
{
struct stat sbuf;
off_t pos = 0;
int ld;
unsigned long i = 1;
unsigned long j,k,m,recent;
unsigned long n = 0;
unsigned long delta = 0;
char lock[MAILTMPLEN];
MESSAGECACHE *elt;
/* do nothing if stream dead */
if (!mtx_ping (stream)) return;
if (stream->rdonly) { /* won't do on readonly files! */
mm_log ("Expunge ignored on readonly mailbox",WARN);
return;
}
if (LOCAL->filetime && !LOCAL->shouldcheck) {
fstat (LOCAL->fd,&sbuf); /* get current write time */
if (LOCAL->filetime < sbuf.st_mtime) LOCAL->shouldcheck = T;
}
/* get exclusive parse/append permission */
if ((ld = lockname (lock,stream->mailbox,LOCK_EX)) < 0) {
mm_log ("Unable to lock expunge mailbox",ERROR);
return;
}
/* get exclusive access */
if (flock (LOCAL->fd,LOCK_EX|LOCK_NB)) {
flock (LOCAL->fd,LOCK_SH); /* recover previous lock */
mm_log("Can't expunge because mailbox is in use by another process",ERROR);
unlockfd (ld,lock); /* release exclusive parse/append permission */
return;
}
mm_critical (stream); /* go critical */
recent = stream->recent; /* get recent now that pinged and locked */
while (i <= stream->nmsgs) { /* for each message */
elt = mtx_elt (stream,i); /* get cache element */
/* number of bytes to smash or preserve */
k = elt->private.special.text.size + elt->rfc822_size;
if (elt->deleted) { /* if deleted */
if (elt->recent) --recent;/* if recent, note one less recent message */
delta += k; /* number of bytes to delete */
mail_expunged (stream,i); /* notify upper levels */
n++; /* count up one more expunged message */
}
else if (i++ && delta) { /* preserved message */
/* first byte to preserve */
j = elt->private.special.offset;
do { /* read from source position */
m = min (k,LOCAL->buflen);
lseek (LOCAL->fd,j,L_SET);
read (LOCAL->fd,LOCAL->buf,m);
pos = j - delta; /* write to destination position */
while (T) {
lseek (LOCAL->fd,pos,L_SET);
if (write (LOCAL->fd,LOCAL->buf,m) > 0) break;
mm_notify (stream,strerror (errno),WARN);
mm_diskerror (stream,errno,T);
}
pos += m; /* new position */
j += m; /* next chunk, perhaps */
} while (k -= m); /* until done */
/* note the new address of this text */
elt->private.special.offset -= delta;
}
/* preserved but no deleted messages */
else pos = elt->private.special.offset + k;
}
if (n) { /* truncate file after last message */
if (pos != (LOCAL->filesize -= delta)) {
sprintf (LOCAL->buf,"Calculated size mismatch %ld != %ld, delta = %ld",
pos,LOCAL->filesize,delta);
mm_log (LOCAL->buf,WARN);
LOCAL->filesize = pos; /* fix it then */
}
ftruncate (LOCAL->fd,LOCAL->filesize);
sprintf (LOCAL->buf,"Expunged %ld messages",n);
/* output the news */
mm_log (LOCAL->buf,(long) NIL);
}
else mm_log ("No messages deleted, so no update needed",(long) NIL);
fsync (LOCAL->fd); /* force disk update */
fstat (LOCAL->fd,&sbuf); /* get new write time */
LOCAL->filetime = sbuf.st_mtime;
mm_nocritical (stream); /* release critical */
/* notify upper level of new mailbox size */
mail_exists (stream,stream->nmsgs);
mail_recent (stream,recent);
flock (LOCAL->fd,LOCK_SH); /* allow sharers again */
unlockfd (ld,lock); /* release exclusive parse/append permission */
}
/* MTX mail copy message(s)
* Accepts: MAIL stream
* sequence
* destination mailbox
* copy options
* Returns: T if success, NIL if failed
*/
long mtx_copy (MAILSTREAM *stream,char *sequence,char *mailbox,long options)
{
struct stat sbuf;
struct utimbuf times;
MESSAGECACHE *elt;
unsigned long i,j,k;
long ret = LONGT;
int fd,ld;
char file[MAILTMPLEN],lock[MAILTMPLEN];
mailproxycopy_t pc =
(mailproxycopy_t) mail_parameters (stream,GET_MAILPROXYCOPY,NIL);
/* make sure valid mailbox */
if (!mtx_isvalid (mailbox,LOCAL->buf)) switch (errno) {
case ENOENT: /* no such file? */
mm_notify (stream,"[TRYCREATE] Must create mailbox before copy",NIL);
return NIL;
case 0: /* merely empty file? */
break;
case EINVAL:
if (pc) return (*pc) (stream,sequence,mailbox,options);
sprintf (LOCAL->buf,"Invalid MTX-format mailbox name: %.80s",mailbox);
mm_log (LOCAL->buf,ERROR);
return NIL;
default:
if (pc) return (*pc) (stream,sequence,mailbox,options);
sprintf (LOCAL->buf,"Not a MTX-format mailbox: %.80s",mailbox);
mm_log (LOCAL->buf,ERROR);
return NIL;
}
if (!((options & CP_UID) ? mail_uid_sequence (stream,sequence) :
mail_sequence (stream,sequence))) return NIL;
/* got file? */
if ((fd = open (mailboxfile (file,mailbox),O_BINARY|O_RDWR|O_CREAT,
S_IREAD|S_IWRITE)) < 0) {
sprintf (LOCAL->buf,"Unable to open copy mailbox: %.80s",strerror (errno));
mm_log (LOCAL->buf,ERROR);
return NIL;
}
mm_critical (stream); /* go critical */
/* get exclusive parse/append permission */
if ((ld = lockname (lock,mailbox,LOCK_EX)) < 0) {
mm_log ("Unable to lock copy mailbox",ERROR);
return NIL;
}
fstat (fd,&sbuf); /* get current file size */
lseek (fd,sbuf.st_size,L_SET);/* move to end of file */
/* for each requested message */
for (i = 1; ret && (i <= stream->nmsgs); i++)
if ((elt = mail_elt (stream,i))->sequence) {
lseek (LOCAL->fd,elt->private.special.offset,L_SET);
/* number of bytes to copy */
k = elt->private.special.text.size + elt->rfc822_size;
do { /* read from source position */
j = min (k,LOCAL->buflen);
read (LOCAL->fd,LOCAL->buf,j);
if (write (fd,LOCAL->buf,j) < 0) ret = NIL;
} while (ret && (k -= j));/* until done */
}
/* make sure all the updates take */
if (!(ret && (ret = !fsync (fd)))) {
sprintf (LOCAL->buf,"Unable to write message: %s",strerror (errno));
mm_log (LOCAL->buf,ERROR);
ftruncate (fd,sbuf.st_size);
}
times.actime = sbuf.st_atime; /* preserve atime and mtime */
times.modtime = sbuf.st_mtime;
utime (file,×); /* set the times */
unlockfd (ld,lock); /* release exclusive parse/append permission */
close (fd); /* close the file */
mm_nocritical (stream); /* release critical */
/* delete all requested messages */
if (ret && (options & CP_MOVE)) {
for (i = 1; i <= stream->nmsgs; i++)
if ((elt = mtx_elt (stream,i))->sequence) {
elt->deleted = T; /* mark message deleted */
/* recalculate status */
mtx_update_status (stream,i,NIL);
}
if (!stream->rdonly) { /* make sure the update takes */
fsync (LOCAL->fd);
fstat (LOCAL->fd,&sbuf); /* get current write time */
LOCAL->filetime = sbuf.st_mtime;
}
}
return ret;
}
/* MTX mail append message from stringstruct
* Accepts: MAIL stream
* destination mailbox
* stringstruct of messages to append
* Returns: T if append successful, else NIL
*/
long mtx_append (MAILSTREAM *stream,char *mailbox,char *flags,char *date,
STRING *message)
{
struct stat sbuf;
int fd,ld;
char *s,tmp[MAILTMPLEN],file[MAILTMPLEN],lock[MAILTMPLEN];
struct utimbuf times;
MESSAGECACHE elt;
long i = 0;
long size = SIZE (message);
long ret = LONGT;
unsigned long uf = 0,j;
long f = mail_parse_flags (stream ? stream : &mtxproto,flags,&j);
/* reverse bits (dontcha wish we had CIRC?) */
while (j) uf |= 1 << (29 - find_rightmost_bit (&j));
if (date) { /* want to preserve date? */
/* yes, parse date into an elt */
if (!mail_parse_date (&elt,date)) {
sprintf (tmp,"Bad date in append: %.80s",date);
mm_log (tmp,ERROR);
return NIL;
}
}
/* N.B.: can't use LOCAL->buf for tmp */
/* make sure valid mailbox */
if (!mtx_isvalid (mailbox,tmp)) switch (errno) {
case ENOENT: /* no such file? */
if (((mailbox[0] == 'I') || (mailbox[0] == 'i')) &&
((mailbox[1] == 'N') || (mailbox[1] == 'n')) &&
((mailbox[2] == 'B') || (mailbox[2] == 'b')) &&
((mailbox[3] == 'O') || (mailbox[3] == 'o')) &&
((mailbox[4] == 'X') || (mailbox[4] == 'x')) && !mailbox[5])
mtx_create (NIL,"INBOX");
else {
mm_notify (stream,"[TRYCREATE] Must create mailbox before append",NIL);
return NIL;
}
/* falls through */
case 0: /* merely empty file? */
break;
case EINVAL:
sprintf (tmp,"Invalid MTX-format mailbox name: %.80s",mailbox);
mm_log (tmp,ERROR);
return NIL;
default:
sprintf (tmp,"Not a MTX-format mailbox: %.80s",mailbox);
mm_log (tmp,ERROR);
return NIL;
}
if ((fd = open (mailboxfile (file,mailbox),O_BINARY|O_RDWR|O_CREAT,
S_IREAD|S_IWRITE)) < 0) {
sprintf (tmp,"Can't open append mailbox: %s",strerror (errno));
mm_log (tmp,ERROR);
return NIL;
}
/* get exclusive parse/append permission */
if ((ld = lockname (lock,mailbox,LOCK_EX)) < 0) {
mm_log ("Unable to lock append mailbox",ERROR);
return NIL;
}
s = (char *) fs_get (size); /* copy message */
for (i = 0; i < size; s[i++] = SNX (message));
mm_critical (stream); /* go critical */
fstat (fd,&sbuf); /* get current file size */
lseek (fd,sbuf.st_size,L_SET);/* move to end of file */
if (date) mail_date(tmp,&elt);/* write preseved date */
else internal_date (tmp); /* get current date in IMAP format */
/* add remainder of header */
sprintf (tmp+26,",%ld;%010lo%02lo\015\012",size,uf,f);
/* write header */
if ((write (fd,tmp,strlen (tmp)) < 0) || ((write (fd,s,size)) < 0) ||
fsync (fd)) {
sprintf (tmp,"Message append failed: %s",strerror (errno));
mm_log (tmp,ERROR);
ftruncate (fd,sbuf.st_size);
ret = NIL;
}
times.actime = sbuf.st_atime; /* preserve atime and mtime */
times.modtime= sbuf.st_mtime;
utime (file,×); /* set the times */
close (fd); /* close the file */
unlockfd (ld,lock); /* release exclusive parse/append permission */
mm_nocritical (stream); /* release critical */
fs_give ((void **) &s); /* flush the buffer */
return ret;
}
/* Internal routines */
/* MTX mail parse mailbox
* Accepts: MAIL stream
* Returns: T if parse OK
* NIL if failure, stream aborted
*/
long mtx_parse (MAILSTREAM *stream)
{
struct stat sbuf;
MESSAGECACHE *elt = NIL;
char c,*s,*t,*x;
char tmp[MAILTMPLEN];
unsigned long i,j;
long curpos = LOCAL->filesize;
long nmsgs = stream->nmsgs;
long recent = stream->recent;
short silent = stream->silent;
fstat (LOCAL->fd,&sbuf); /* get status */
if (sbuf.st_size < curpos) { /* sanity check */
sprintf (tmp,"Mailbox shrank from %ld to %ld!",curpos,sbuf.st_size);
mm_log (tmp,ERROR);
mtx_close (stream,NIL);
return NIL;
}
stream->silent = T; /* don't pass up mm_exists() events yet */
while (sbuf.st_size - curpos){/* while there is stuff to parse */
/* get to that position in the file */
lseek (LOCAL->fd,curpos,L_SET);
if ((i = read (LOCAL->fd,LOCAL->buf,64)) <= 0) {
sprintf (tmp,"Unable to read internal header at %ld, size = %ld: %s",
curpos,sbuf.st_size,i ? strerror (errno) : "no data read");
mm_log (tmp,ERROR);
mtx_close (stream,NIL);
return NIL;
}
LOCAL->buf[i] = '\0'; /* tie off buffer just in case */
if (!((s = strchr (LOCAL->buf,'\015')) && (s[1] == '\012'))) {
sprintf (tmp,"Unable to find CRLF at %ld in %ld bytes, text: %s",
curpos,i,LOCAL->buf);
mm_log (tmp,ERROR);
mtx_close (stream,NIL);
return NIL;
}
*s = '\0'; /* tie off header line */
i = (s + 2) - LOCAL->buf; /* note start of text offset */
if (!((s = strchr (LOCAL->buf,',')) && (t = strchr (s+1,';')))) {
sprintf (tmp,"Unable to parse internal header at %ld: %s",curpos,
LOCAL->buf);
mm_log (tmp,ERROR);
mtx_close (stream,NIL);
return NIL;
}
*s++ = '\0'; *t++ = '\0'; /* tie off fields */
/* swell the cache */
mail_exists (stream,++nmsgs);
/* instantiate an elt for this message */
(elt = mail_elt (stream,nmsgs))->valid = T;
elt->private.uid = ++stream->uid_last;
/* note file offset of header */
elt->private.special.offset = curpos;
/* in case error */
elt->private.special.text.size = 0;
/* header size not known yet */
elt->private.msg.header.text.size = 0;
/* parse the header components */
if (mail_parse_date (elt,LOCAL->buf) &&
(elt->rfc822_size = strtoul (x = s,&s,10)) && (!(s && *s)) &&
isdigit (t[0]) && isdigit (t[1]) && isdigit (t[2]) &&
isdigit (t[3]) && isdigit (t[4]) && isdigit (t[5]) &&
isdigit (t[6]) && isdigit (t[7]) && isdigit (t[8]) &&
isdigit (t[9]) && isdigit (t[10]) && isdigit (t[11]) && !t[12])
elt->private.special.text.size = i;
if (elt->private.special.text.size) elt->private.msg.header.offset =
elt->private.msg.text.offset =
elt->private.special.offset + elt->private.special.text.size;
else { /* oops */
sprintf (tmp,"Unable to parse internal header elements at %ld: %s,%s;%s",
curpos,LOCAL->buf,x,t);
mm_log (tmp,ERROR);
mtx_close (stream,NIL);
return NIL;
}
/* make sure didn't run off end of file */
if ((curpos += (elt->rfc822_size + i)) > sbuf.st_size) {
sprintf (tmp,"Last message (at %lu) runs past end of file (%lu > %lu)",
elt->private.special.offset,curpos,sbuf.st_size);
mm_log (tmp,ERROR);
mtx_close (stream,NIL);
return NIL;
}
c = t[10]; /* remember first system flags byte */
t[10] = '\0'; /* tie off flags */
j = strtoul (t,NIL,8); /* get user flags value */
t[10] = c; /* restore first system flags byte */
/* set up all valid user flags (reversed!) */
while (j) if (((i = 29 - find_rightmost_bit (&j)) < NUSERFLAGS) &&
stream->user_flags[i]) elt->user_flags |= 1 << i;
/* calculate system flags */
if ((j = ((t[10]-'0') * 8) + t[11]-'0') & fSEEN) elt->seen = T;
if (j & fDELETED) elt->deleted = T;
if (j & fFLAGGED) elt->flagged = T;
if (j & fANSWERED) elt->answered = T;
if (j & fDRAFT) elt->draft = T;
if (!(j & fOLD)) { /* newly arrived message? */
elt->recent = T;
recent++; /* count up a new recent message */
/* mark it as old */
mtx_update_status (stream,nmsgs,NIL);
}
}
fsync (LOCAL->fd); /* make sure all the fOLD flags take */
/* update parsed file size and time */
LOCAL->filesize = sbuf.st_size;
fstat (LOCAL->fd,&sbuf); /* get status again to ensure time is right */
LOCAL->filetime = sbuf.st_mtime;
stream->silent = silent; /* can pass up events now */
mail_exists (stream,nmsgs); /* notify upper level of new mailbox size */
mail_recent (stream,recent); /* and of change in recent messages */
return LONGT; /* return the winnage */
}
/* MTX get cache element with status updating from file
* Accepts: MAIL stream
* message number
* Returns: cache element
*/
MESSAGECACHE *mtx_elt (MAILSTREAM *stream,unsigned long msgno)
{
MESSAGECACHE *elt = mail_elt (stream,msgno);
struct { /* old flags */
unsigned int seen : 1;
unsigned int deleted : 1;
unsigned int flagged : 1;
unsigned int answered : 1;
unsigned int draft : 1;
unsigned long user_flags;
} old;
old.seen = elt->seen; old.deleted = elt->deleted; old.flagged = elt->flagged;
old.answered = elt->answered; old.draft = elt->draft;
old.user_flags = elt->user_flags;
mtx_read_flags (stream,elt);
if ((old.seen != elt->seen) || (old.deleted != elt->deleted) ||
(old.flagged != elt->flagged) || (old.answered != elt->answered) ||
(old.draft != elt->draft) || (old.user_flags != elt->user_flags))
mm_flags (stream,msgno); /* let top level know */
return elt;
}
/* MTX read flags from file
* Accepts: MAIL stream
* Returns: cache element
*/
void mtx_read_flags (MAILSTREAM *stream,MESSAGECACHE *elt)
{
unsigned long i,j;
/* noop if readonly and have valid flags */
if (stream->rdonly && elt->valid) return;
/* set the seek pointer */
lseek (LOCAL->fd,(off_t) elt->private.special.offset +
elt->private.special.text.size - 14,L_SET);
/* read the new flags */
if (read (LOCAL->fd,LOCAL->buf,12) < 0) {
sprintf (LOCAL->buf,"Unable to read new status: %s",strerror (errno));
fatal (LOCAL->buf);
}
/* calculate system flags */
i = (((LOCAL->buf[10]-'0') * 8) + LOCAL->buf[11]-'0');
elt->seen = i & fSEEN ? T : NIL; elt->deleted = i & fDELETED ? T : NIL;
elt->flagged = i & fFLAGGED ? T : NIL;
elt->answered = i & fANSWERED ? T : NIL; elt->draft = i & fDRAFT ? T : NIL;
LOCAL->buf[10] = '\0'; /* tie off flags */
j = strtoul(LOCAL->buf,NIL,8);/* get user flags value */
/* set up all valid user flags (reversed!) */
while (j) if (((i = 29 - find_rightmost_bit (&j)) < NUSERFLAGS) &&
stream->user_flags[i]) elt->user_flags |= 1 << i;
elt->valid = T; /* have valid flags now */
}
/* MTX update status string
* Accepts: MAIL stream
* message number
* flag saying whether or not to sync
*/
void mtx_update_status (MAILSTREAM *stream,unsigned long msgno,long syncflag)
{
MESSAGECACHE *elt = mail_elt (stream,msgno);
struct stat sbuf;
unsigned long j,k = 0;
/* readonly */
if (stream->rdonly || !elt->valid) mtx_read_flags (stream,elt);
else { /* readwrite */
j = elt->user_flags; /* get user flags */
/* reverse bits (dontcha wish we had CIRC?) */
while (j) k |= 1 << (29 - find_rightmost_bit (&j));
/* print new flag string */
sprintf (LOCAL->buf,"%010lo%02o",k,
fOLD + (fSEEN * elt->seen) + (fDELETED * elt->deleted) +
(fFLAGGED * elt->flagged) + (fANSWERED * elt->answered) +
(fDRAFT * elt->draft));
while (T) { /* get to that place in the file */
lseek (LOCAL->fd,(off_t) elt->private.special.offset +
elt->private.special.text.size - 14,L_SET);
/* write new flags */
if (write (LOCAL->fd,LOCAL->buf,12) > 0) break;
mm_notify (stream,strerror (errno),WARN);
mm_diskerror (stream,errno,T);
}
if (syncflag) { /* sync if requested */
fsync (LOCAL->fd);
fstat (LOCAL->fd,&sbuf); /* get new write time */
LOCAL->filetime = sbuf.st_mtime;
}
}
}
/* MTX locate header for a message
* Accepts: MAIL stream
* message number
* pointer to returned header size
* Returns: position of header in file
*/
unsigned long mtx_hdrpos (MAILSTREAM *stream,unsigned long msgno,
unsigned long *size)
{
unsigned long siz;
long i = 0;
int q = 0;
char *s,tmp[MAILTMPLEN];
MESSAGECACHE *elt = mtx_elt (stream,msgno);
/* is header size known? */
if (!(*size = elt->private.msg.header.text.size)) {
/* get to header position */
lseek (LOCAL->fd,elt->private.msg.header.offset,L_SET);
/* search message for CRLF CRLF */
for (siz = 1; siz <= elt->rfc822_size; siz++) {
/* read another buffer as necessary */
if (--i <= 0) /* buffer empty? */
if (read (LOCAL->fd,s = tmp,
i = min (elt->rfc822_size - siz,(long) MAILTMPLEN)) < 0)
/* I/O error? */
return elt->private.msg.header.offset;
switch (q) { /* sniff at buffer */
case 0: /* first character */
q = (*s++ == '\015') ? 1 : 0;
break;
case 1: /* second character */
q = (*s++ == '\012') ? 2 : 0;
break;
case 2: /* third character */
q = (*s++ == '\015') ? 3 : 0;
break;
case 3: /* fourth character */
if (*s++ == '\012') { /* have the sequence? */
/* yes, note for later */
elt->private.msg.header.text.size = *size = siz;
return elt->private.msg.header.offset;
}
q = 0; /* lost... */
break;
}
}
/* header consumes entire message */
elt->private.msg.header.text.size = *size = elt->rfc822_size;
}
return elt->private.msg.header.offset;
}