/* ========================================================================
* Copyright 1988-2007 University of Washington
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
*
* ========================================================================
*/
/*
* Program: Tenex 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: 11 October 2007
*/
/* FILE TIME SEMANTICS
*
* The atime is the last read time of the file.
* The mtime is the last flags update time of the file.
* The ctime is the last write time of the file.
*
* TEXT SIZE SEMANTICS
*
* Most of the text sizes are in internal (LF-only) form, except for the
* msg.text size. Beware.
*/
#include <stdio.h>
#include <ctype.h>
#include <errno.h>
extern int errno; /* just in case */
#include "mail.h"
#include "osdep.h"
#include <sys/stat.h>
#include "misc.h"
#include "dummy.h"
/* TENEX I/O stream local data */
typedef struct tenex_local {
unsigned int shouldcheck: 1; /* if ping should do a check instead */
unsigned int mustcheck: 1; /* if ping must do a check instead */
int fd; /* file descriptor for I/O */
off_t filesize; /* file size parsed */
time_t filetime; /* last file time */
time_t lastsnarf; /* local snarf time */
unsigned char *buf; /* temporary buffer */
unsigned long buflen; /* current size of temporary buffer */
unsigned long uid; /* current text uid */
SIZEDTEXT text; /* current text */
} TENEXLOCAL;
/* Convenient access to local data */
#define LOCAL ((TENEXLOCAL *) stream->local)
/* Function prototypes */
DRIVER *tenex_valid (char *name);
int tenex_isvalid (char *name,char *tmp);
void *tenex_parameters (long function,void *value);
void tenex_scan (MAILSTREAM *stream,char *ref,char *pat,char *contents);
void tenex_list (MAILSTREAM *stream,char *ref,char *pat);
void tenex_lsub (MAILSTREAM *stream,char *ref,char *pat);
long tenex_create (MAILSTREAM *stream,char *mailbox);
long tenex_delete (MAILSTREAM *stream,char *mailbox);
long tenex_rename (MAILSTREAM *stream,char *old,char *newname);
long tenex_status (MAILSTREAM *stream,char *mbx,long flags);
MAILSTREAM *tenex_open (MAILSTREAM *stream);
void tenex_close (MAILSTREAM *stream,long options);
void tenex_fast (MAILSTREAM *stream,char *sequence,long flags);
void tenex_flags (MAILSTREAM *stream,char *sequence,long flags);
char *tenex_header (MAILSTREAM *stream,unsigned long msgno,
unsigned long *length,long flags);
long tenex_text (MAILSTREAM *stream,unsigned long msgno,STRING *bs,long flags);
void tenex_flag (MAILSTREAM *stream,char *sequence,char *flag,long flags);
void tenex_flagmsg (MAILSTREAM *stream,MESSAGECACHE *elt);
long tenex_ping (MAILSTREAM *stream);
void tenex_check (MAILSTREAM *stream);
void tenex_snarf (MAILSTREAM *stream);
long tenex_expunge (MAILSTREAM *stream,char *sequence,long options);
long tenex_copy (MAILSTREAM *stream,char *sequence,char *mailbox,long options);
long tenex_append (MAILSTREAM *stream,char *mailbox,append_t af,void *data);
unsigned long tenex_size (MAILSTREAM *stream,unsigned long m);
char *tenex_file (char *dst,char *name);
long tenex_parse (MAILSTREAM *stream);
MESSAGECACHE *tenex_elt (MAILSTREAM *stream,unsigned long msgno);
void tenex_read_flags (MAILSTREAM *stream,MESSAGECACHE *elt);
void tenex_update_status (MAILSTREAM *stream,unsigned long msgno,
long syncflag);
unsigned long tenex_hdrpos (MAILSTREAM *stream,unsigned long msgno,
unsigned long *size);
/* Tenex mail routines */
/* Driver dispatch used by MAIL */
DRIVER tenexdriver = {
"tenex", /* driver name */
DR_LOCAL|DR_MAIL|DR_NOSTICKY|DR_LOCKING,
/* driver flags */
(DRIVER *) NIL, /* next driver */
tenex_valid, /* mailbox is valid for us */
tenex_parameters, /* manipulate parameters */
tenex_scan, /* scan mailboxes */
tenex_list, /* list mailboxes */
tenex_lsub, /* list subscribed mailboxes */
NIL, /* subscribe to mailbox */
NIL, /* unsubscribe from mailbox */
dummy_create, /* create mailbox */
tenex_delete, /* delete mailbox */
tenex_rename, /* rename mailbox */
tenex_status, /* status of mailbox */
tenex_open, /* open mailbox */
tenex_close, /* close mailbox */
tenex_fast, /* fetch message "fast" attributes */
tenex_flags, /* fetch message flags */
NIL, /* fetch overview */
NIL, /* fetch message envelopes */
tenex_header, /* fetch message header */
tenex_text, /* fetch message body */
NIL, /* fetch partial message text */
NIL, /* unique identifier */
NIL, /* message number */
tenex_flag, /* modify flags */
tenex_flagmsg, /* per-message modify flags */
NIL, /* search for message based on criteria */
NIL, /* sort messages */
NIL, /* thread messages */
tenex_ping, /* ping mailbox to see if still alive */
tenex_check, /* check for new messages */
tenex_expunge, /* expunge deleted messages */
tenex_copy, /* copy messages to another mailbox */
tenex_append, /* append string message to mailbox */
NIL /* garbage collect stream */
};
/* prototype stream */
MAILSTREAM tenexproto = {&tenexdriver};
/* Tenex mail validate mailbox
* Accepts: mailbox name
* Returns: our driver if name is valid, NIL otherwise
*/
DRIVER *tenex_valid (char *name)
{
char tmp[MAILTMPLEN];
return tenex_isvalid (name,tmp) ? &tenexdriver : NIL;
}
/* Tenex mail test for valid mailbox
* Accepts: mailbox name
* Returns: T if valid, NIL otherwise
*/
int tenex_isvalid (char *name,char *tmp)
{
int fd;
int ret = NIL;
char *s,file[MAILTMPLEN];
struct stat sbuf;
time_t tp[2];
errno = EINVAL; /* assume invalid argument */
/* if file, get its status */
if ((s = tenex_file (file,name)) && !stat (s,&sbuf)) {
if (!sbuf.st_size) { /* allow empty file if INBOX */
if ((s = mailboxfile (tmp,name)) && !*s) ret = T;
else errno = 0; /* empty file */
}
else if ((fd = open (file,O_RDONLY,NIL)) >= 0) {
memset (tmp,'\0',MAILTMPLEN);
if ((read (fd,tmp,64) >= 0) && (s = strchr (tmp,'\012')) &&
(s[-1] != '\015')) { /* 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+18,',')) && strchr (s+2,';')) ? T : NIL;
}
else errno = -1; /* bogus format */
close (fd); /* close the file */
/* \Marked status? */
if (sbuf.st_ctime > sbuf.st_atime) {
tp[0] = sbuf.st_atime; /* preserve atime and mtime */
tp[1] = sbuf.st_mtime;
utime (file,tp); /* set the times */
}
}
}
/* in case INBOX but not tenex format */
else if ((errno == ENOENT) && !compare_cstring (name,"INBOX")) errno = -1;
return ret; /* return what we should */
}
/* Tenex manipulate driver parameters
* Accepts: function code
* function-dependent value
* Returns: function-dependent return value
*/
void *tenex_parameters (long function,void *value)
{
void *ret = NIL;
switch ((int) function) {
case GET_INBOXPATH:
if (value) ret = tenex_file ((char *) value,"INBOX");
break;
}
return ret;
}
/* Tenex mail scan mailboxes
* Accepts: mail stream
* reference
* pattern to search
* string to scan
*/
void tenex_scan (MAILSTREAM *stream,char *ref,char *pat,char *contents)
{
if (stream) dummy_scan (NIL,ref,pat,contents);
}
/* Tenex mail list mailboxes
* Accepts: mail stream
* reference
* pattern to search
*/
void tenex_list (MAILSTREAM *stream,char *ref,char *pat)
{
if (stream) dummy_list (NIL,ref,pat);
}
/* Tenex mail list subscribed mailboxes
* Accepts: mail stream
* reference
* pattern to search
*/
void tenex_lsub (MAILSTREAM *stream,char *ref,char *pat)
{
if (stream) dummy_lsub (NIL,ref,pat);
}
/* Tenex mail delete mailbox
* Accepts: MAIL stream
* mailbox name to delete
* Returns: T on success, NIL on failure
*/
long tenex_delete (MAILSTREAM *stream,char *mailbox)
{
return tenex_rename (stream,mailbox,NIL);
}
/* Tenex mail rename mailbox
* Accepts: MAIL stream
* old mailbox name
* new mailbox name (or NIL for delete)
* Returns: T on success, NIL on failure
*/
long tenex_rename (MAILSTREAM *stream,char *old,char *newname)
{
long ret = T;
char c,*s,tmp[MAILTMPLEN],file[MAILTMPLEN],lock[MAILTMPLEN];
int fd,ld;
struct stat sbuf;
if (!tenex_file (file,old) ||
(newname && (!((s = mailboxfile (tmp,newname)) && *s) ||
((s = strrchr (tmp,'/')) && !s[1])))) {
sprintf (tmp,newname ?
"Can't rename mailbox %.80s to %.80s: invalid name" :
"Can't delete mailbox %.80s: invalid name",
old,newname);
MM_LOG (tmp,ERROR);
return NIL;
}
else if ((fd = open (file,O_RDWR,NIL)) < 0) {
sprintf (tmp,"Can't open mailbox %.80s: %s",old,strerror (errno));
MM_LOG (tmp,ERROR);
return NIL;
}
/* get exclusive parse/append permission */
if ((ld = lockfd (fd,lock,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 = strrchr (tmp,'/')) {/* 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_path (stream,tmp,get_dir_protection (newname)))
ret = NIL;
else *s = c; /* restore full name */
}
/* 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 if (unlink (file)) {
sprintf (tmp,"Can't delete mailbox %.80s: %s",old,strerror (errno));
MM_LOG (tmp,ERROR);
ret = NIL; /* set failure */
}
flock (fd,LOCK_UN); /* release lock on the file */
close (fd); /* close the file */
unlockfd (ld,lock); /* release exclusive parse/append permission */
/* recreate file if renamed INBOX */
if (ret && !compare_cstring (old,"INBOX")) dummy_create (NIL,"mail.txt");
return ret; /* return success */
}
/* Tenex Mail status
* Accepts: mail stream
* mailbox name
* status flags
* Returns: T on success, NIL on failure
*/
long tenex_status (MAILSTREAM *stream,char *mbx,long flags)
{
MAILSTATUS status;
unsigned long i;
MAILSTREAM *tstream = NIL;
MAILSTREAM *systream = NIL;
/* make temporary stream (unless this mbx) */
if (!stream && !(stream = tstream =
mail_open (NIL,mbx,OP_READONLY|OP_SILENT))) return NIL;
status.flags = flags; /* return status values */
status.messages = stream->nmsgs;
status.recent = stream->recent;
if (flags & SA_UNSEEN) /* must search to get unseen messages */
for (i = 1,status.unseen = 0; i <= stream->nmsgs; i++)
if (!mail_elt (stream,i)->seen) status.unseen++;
status.uidnext = stream->uid_last + 1;
status.uidvalidity = stream->uid_validity;
/* calculate post-snarf results */
if (!status.recent && stream->inbox &&
(systream = mail_open (NIL,sysinbox (),OP_READONLY|OP_SILENT))) {
status.messages += systream->nmsgs;
status.recent += systream->recent;
if (flags & SA_UNSEEN) /* must search to get unseen messages */
for (i = 1; i <= systream->nmsgs; i++)
if (!mail_elt (systream,i)->seen) status.unseen++;
/* kludge but probably good enough */
status.uidnext += systream->nmsgs;
}
MM_STATUS(stream,mbx,&status);/* pass status to main program */
if (tstream) mail_close (tstream);
if (systream) mail_close (systream);
return T; /* success */
}
/* Tenex mail open
* Accepts: stream to open
* Returns: stream on success, NIL on failure
*/
MAILSTREAM *tenex_open (MAILSTREAM *stream)
{
int fd,ld;
char tmp[MAILTMPLEN];
blocknotify_t bn = (blocknotify_t) mail_parameters (NIL,GET_BLOCKNOTIFY,NIL);
/* return prototype for OP_PROTOTYPE call */
if (!stream) return user_flags (&tenexproto);
if (stream->local) fatal ("tenex recycle stream");
user_flags (stream); /* set up user flags */
/* canonicalize the mailbox name */
if (!tenex_file (tmp,stream->mailbox)) {
sprintf (tmp,"Can't open - invalid name: %.80s",stream->mailbox);
MM_LOG (tmp,ERROR);
}
if (stream->rdonly ||
(fd = open (tmp,O_RDWR,NIL)) < 0) {
if ((fd = open (tmp,O_RDONLY,NIL)) < 0) {
sprintf (tmp,"Can't open mailbox: %s",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 (TENEXLOCAL));
LOCAL->buf = (char *) fs_get (CHUNKSIZE);
LOCAL->buflen = CHUNKSIZE - 1;
LOCAL->text.data = (unsigned char *) fs_get (CHUNKSIZE);
LOCAL->text.size = CHUNKSIZE - 1;
/* note if an INBOX or not */
stream->inbox = !compare_cstring (stream->mailbox,"INBOX");
LOCAL->fd = fd; /* bind the file */
/* flush old name */
fs_give ((void **) &stream->mailbox);
/* save canonical name */
stream->mailbox = cpystr (tmp);
/* get shared parse permission */
if ((ld = lockfd (fd,tmp,LOCK_SH)) < 0) {
MM_LOG ("Unable to lock open mailbox",ERROR);
return NIL;
}
(*bn) (BLOCK_FILELOCK,NIL);
flock (LOCAL->fd,LOCK_SH); /* lock the file */
(*bn) (BLOCK_NONE,NIL);
unlockfd (ld,tmp); /* release shared parse permission */
LOCAL->filesize = 0; /* initialize parsed file size */
/* time not set up yet */
LOCAL->lastsnarf = LOCAL->filetime = 0;
LOCAL->mustcheck = LOCAL->shouldcheck = NIL;
stream->sequence++; /* bump sequence number */
/* parse mailbox */
stream->nmsgs = stream->recent = 0;
if (tenex_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 */
}
/* Tenex mail close
* Accepts: MAIL stream
* close options
*/
void tenex_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) tenex_expunge (stream,NIL,NIL);
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);
if (LOCAL->text.data) fs_give ((void **) &LOCAL->text.data);
/* nuke the local data */
fs_give ((void **) &stream->local);
stream->dtb = NIL; /* log out the DTB */
}
}
/* Tenex mail fetch fast data
* Accepts: MAIL stream
* sequence
* option flags
*/
void tenex_fast (MAILSTREAM *stream,char *sequence,long flags)
{
STRING bs;
MESSAGECACHE *elt;
unsigned long i;
if (stream && LOCAL &&
((flags & FT_UID) ? mail_uid_sequence (stream,sequence) :
mail_sequence (stream,sequence)))
for (i = 1; i <= stream->nmsgs; i++)
if ((elt = mail_elt (stream,i))->sequence) {
if (!elt->rfc822_size) { /* have header size yet? */
lseek (LOCAL->fd,elt->private.special.offset +
elt->private.special.text.size,L_SET);
/* resize bigbuf if necessary */
if (LOCAL->buflen < elt->private.msg.full.text.size) {
fs_give ((void **) &LOCAL->buf);
LOCAL->buflen = elt->private.msg.full.text.size;
LOCAL->buf = (char *) fs_get (LOCAL->buflen + 1);
}
/* tie off string */
LOCAL->buf[elt->private.msg.full.text.size] = '\0';
/* read in the message */
read (LOCAL->fd,LOCAL->buf,elt->private.msg.full.text.size);
INIT (&bs,mail_string,(void *) LOCAL->buf,
elt->private.msg.full.text.size);
/* calculate its CRLF size */
elt->rfc822_size = strcrlflen (&bs);
}
tenex_elt (stream,i); /* get current flags from file */
}
}
/* Tenex mail fetch flags
* Accepts: MAIL stream
* sequence
* option flags
* Sniffs at file to get flags
*/
void tenex_flags (MAILSTREAM *stream,char *sequence,long flags)
{
unsigned long i;
if (stream && LOCAL &&
((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) tenex_elt (stream,i);
}
/* TENEX 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 *tenex_header (MAILSTREAM *stream,unsigned long msgno,
unsigned long *length,long flags)
{
char *s;
unsigned long i;
*length = 0; /* default to empty */
if (flags & FT_UID) return "";/* UID call "impossible" */
/* get to header position */
lseek (LOCAL->fd,tenex_hdrpos (stream,msgno,&i),L_SET);
if (flags & FT_INTERNAL) {
if (i > LOCAL->buflen) { /* resize if not enough space */
fs_give ((void **) &LOCAL->buf);
LOCAL->buf = (char *) fs_get (LOCAL->buflen = i + 1);
}
/* slurp the data */
read (LOCAL->fd,LOCAL->buf,*length = i);
}
else {
s = (char *) fs_get (i + 1);/* get readin buffer */
s[i] = '\0'; /* tie off string */
read (LOCAL->fd,s,i); /* slurp the data */
/* make CRLF copy of string */
*length = strcrlfcpy (&LOCAL->buf,&LOCAL->buflen,s,i);
fs_give ((void **) &s); /* free readin buffer */
}
return (char *) LOCAL->buf;
}
/* TENEX mail fetch message text (body only)
* Accepts: MAIL stream
* message # to fetch
* pointer to returned stringstruct
* option flags
* Returns: T, always
*/
long tenex_text (MAILSTREAM *stream,unsigned long msgno,STRING *bs,long flags)
{
char *s;
unsigned long i,j;
MESSAGECACHE *elt;
/* UID call "impossible" */
if (flags & FT_UID) return NIL;
/* get message status */
elt = tenex_elt (stream,msgno);
/* if message not seen */
if (!(flags & FT_PEEK) && !elt->seen) {
elt->seen = T; /* mark message as seen */
/* recalculate status */
tenex_update_status (stream,msgno,T);
MM_FLAGS (stream,msgno);
}
if (flags & FT_INTERNAL) { /* if internal representation wanted */
/* find header position */
i = tenex_hdrpos (stream,msgno,&j);
if (i > LOCAL->buflen) { /* resize if not enough space */
fs_give ((void **) &LOCAL->buf);
LOCAL->buf = (char *) fs_get (LOCAL->buflen = i + 1);
}
/* go to text position */
lseek (LOCAL->fd,i + j,L_SET);
/* slurp the data */
read (LOCAL->fd,LOCAL->buf,i);
/* set up stringstruct for internal */
INIT (bs,mail_string,LOCAL->buf,i);
}
else { /* normal form, previous text cached? */
if (elt->private.uid == LOCAL->uid)
i = elt->private.msg.text.text.size;
else { /* not cached, cache it now */
LOCAL->uid = elt->private.uid;
/* find header position */
i = tenex_hdrpos (stream,msgno,&j);
/* go to text position */
lseek (LOCAL->fd,i + j,L_SET);
s = (char *) fs_get ((i = tenex_size (stream,msgno) - j) + 1);
s[i] = '\0'; /* tie off string */
read (LOCAL->fd,s,i); /* slurp the data */
/* make CRLF copy of string */
i = elt->private.msg.text.text.size =
strcrlfcpy (&LOCAL->text.data,&LOCAL->text.size,s,i);
fs_give ((void **) &s); /* free readin buffer */
}
/* set up stringstruct */
INIT (bs,mail_string,LOCAL->text.data,i);
}
return T; /* success */
}
/* Tenex mail modify flags
* Accepts: MAIL stream
* sequence
* flag(s)
* option flags
*/
void tenex_flag (MAILSTREAM *stream,char *sequence,char *flag,long flags)
{
time_t tp[2];
struct stat sbuf;
if (!stream->rdonly) { /* make sure the update takes */
fsync (LOCAL->fd);
fstat (LOCAL->fd,&sbuf); /* get current write time */
tp[1] = LOCAL->filetime = sbuf.st_mtime;
tp[0] = time (0); /* make sure read comes after all that */
utime (stream->mailbox,tp);
}
}
/* Tenex mail per-message modify flags
* Accepts: MAIL stream
* message cache element
*/
void tenex_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 */
tenex_update_status (stream,elt->msgno,NIL);
}
/* Tenex mail ping mailbox
* Accepts: MAIL stream
* Returns: T if stream still alive, NIL if not
*/
long tenex_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) {
LOCAL->filetime = sbuf.st_mtime;
if (LOCAL->shouldcheck) /* babble when we do this unilaterally */
MM_NOTIFY (stream,"[CHECK] Checking for flag updates",NIL);
while (i <= stream->nmsgs) tenex_elt (stream,i++);
LOCAL->mustcheck = LOCAL->shouldcheck = NIL;
}
/* get shared parse/append permission */
if ((sbuf.st_size != LOCAL->filesize) &&
((ld = lockfd (LOCAL->fd,lock,LOCK_SH)) >= 0)) {
/* parse resulting mailbox */
r = (tenex_parse (stream)) ? T : NIL;
unlockfd (ld,lock); /* release shared parse/append permission */
}
if (LOCAL) { /* stream must still be alive */
/* snarf if this is a read-write inbox */
if (stream->inbox && !stream->rdonly) {
tenex_snarf (stream);
fstat (LOCAL->fd,&sbuf);/* see if file changed now */
if ((sbuf.st_size != LOCAL->filesize) &&
((ld = lockfd (LOCAL->fd,lock,LOCK_SH)) >= 0)) {
/* parse resulting mailbox */
r = (tenex_parse (stream)) ? T : NIL;
unlockfd (ld,lock); /* release shared parse/append permission */
}
}
}
}
return r; /* return result of the parse */
}
/* Tenex mail check mailbox (reparses status too)
* Accepts: MAIL stream
*/
void tenex_check (MAILSTREAM *stream)
{
/* mark that a check is desired */
if (LOCAL) LOCAL->mustcheck = T;
if (tenex_ping (stream)) MM_LOG ("Check completed",(long) NIL);
}
/* Tenex mail snarf messages from system inbox
* Accepts: MAIL stream
*/
void tenex_snarf (MAILSTREAM *stream)
{
unsigned long i = 0;
unsigned long j,r,hdrlen,txtlen;
struct stat sbuf;
char *hdr,*txt,lock[MAILTMPLEN],tmp[MAILTMPLEN];
MESSAGECACHE *elt;
MAILSTREAM *sysibx = NIL;
int ld;
/* give up if can't get exclusive permission */
if ((time (0) >= (LOCAL->lastsnarf +
(long) mail_parameters (NIL,GET_SNARFINTERVAL,NIL))) &&
strcmp (sysinbox (),stream->mailbox) &&
((ld = lockfd (LOCAL->fd,lock,LOCK_EX)) >= 0)) {
MM_CRITICAL (stream); /* go critical */
/* sizes match and anything in sysinbox? */
if (!stat (sysinbox (),&sbuf) && sbuf.st_size &&
!fstat (LOCAL->fd,&sbuf) && (sbuf.st_size == LOCAL->filesize) &&
(sysibx = mail_open (sysibx,sysinbox (),OP_SILENT)) &&
(!sysibx->rdonly) && (r = sysibx->nmsgs)) {
/* yes, go to end of file in our mailbox */
lseek (LOCAL->fd,sbuf.st_size,L_SET);
/* for each message in sysibx mailbox */
while (r && (++i <= sysibx->nmsgs)) {
/* snarf message from system INBOX */
hdr = cpystr (mail_fetchheader_full(sysibx,i,NIL,&hdrlen,FT_INTERNAL));
txt = mail_fetchtext_full (sysibx,i,&txtlen,FT_INTERNAL|FT_PEEK);
/* if have a message */
if (j = hdrlen + txtlen) {
/* calculate header line */
mail_date (LOCAL->buf,elt = mail_elt (sysibx,i));
sprintf (LOCAL->buf + strlen (LOCAL->buf),
",%lu;0000000000%02o\n",j,(unsigned)
((fSEEN * elt->seen) + (fDELETED * elt->deleted) +
(fFLAGGED * elt->flagged) + (fANSWERED * elt->answered) +
(fDRAFT * elt->draft)));
/* copy message */
if ((write (LOCAL->fd,LOCAL->buf,strlen (LOCAL->buf)) < 0) ||
(write (LOCAL->fd,hdr,hdrlen) < 0) ||
(write (LOCAL->fd,txt,txtlen) < 0)) r = 0;
}
fs_give ((void **) &hdr);
}
/* make sure all the updates take */
if (fsync (LOCAL->fd)) r = 0;
if (r) { /* delete all the messages we copied */
if (r == 1) strcpy (tmp,"1");
else sprintf (tmp,"1:%lu",r);
mail_flag (sysibx,tmp,"\\Deleted",ST_SET);
mail_expunge (sysibx); /* now expunge all those messages */
}
else {
sprintf (LOCAL->buf,"Can't copy new mail: %s",strerror (errno));
MM_LOG (LOCAL->buf,WARN);
ftruncate (LOCAL->fd,sbuf.st_size);
}
fstat (LOCAL->fd,&sbuf); /* yes, get current file size */
LOCAL->filetime = sbuf.st_mtime;
}
if (sysibx) mail_close (sysibx);
MM_NOCRITICAL (stream); /* release critical */
unlockfd (ld,lock); /* release exclusive parse/append permission */
LOCAL->lastsnarf = time (0);/* note time of last snarf */
}
}
/* Tenex mail expunge mailbox
* Accepts: MAIL stream
* sequence to expunge if non-NIL
* expunge options
* Returns: T, always
*/
long tenex_expunge (MAILSTREAM *stream,char *sequence,long options)
{
long ret;
time_t tp[2];
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;
blocknotify_t bn = (blocknotify_t) mail_parameters (NIL,GET_BLOCKNOTIFY,NIL);
if (!(ret = (sequence ? ((options & EX_UID) ?
mail_uid_sequence (stream,sequence) :
mail_sequence (stream,sequence)) : LONGT) &&
tenex_ping (stream))); /* parse sequence if given, ping stream */
else if (stream->rdonly) MM_LOG ("Expunge ignored on readonly mailbox",WARN);
else {
if (LOCAL->filetime && !LOCAL->shouldcheck) {
fstat (LOCAL->fd,&sbuf); /* get current write time */
if (LOCAL->filetime < sbuf.st_mtime) LOCAL->shouldcheck = T;
}
/* The cretins who designed flock() created a window of vulnerability in
* upgrading locks from shared to exclusive or downgrading from exclusive
* to shared. Rather than maintain the lock at shared status at a minimum,
* flock() actually *releases* the former lock. Obviously they never talked
* to any database guys. Fortunately, we have the parse/append permission
* lock. If we require this lock before going exclusive on the mailbox,
* another process can not sneak in and steal the exclusive mailbox lock on
* us, because it will block on trying to get parse/append permission first.
*/
/* get exclusive parse/append permission */
if ((ld = lockfd (LOCAL->fd,lock,LOCK_EX)) < 0)
MM_LOG ("Unable to lock expunge mailbox",ERROR);
/* make sure see any newly-arrived messages */
else if (!tenex_parse (stream));
/* get exclusive access */
else if (flock (LOCAL->fd,LOCK_EX|LOCK_NB)) {
(*bn) (BLOCK_FILELOCK,NIL);
flock (LOCAL->fd,LOCK_SH);/* recover previous lock */
(*bn) (BLOCK_NONE,NIL);
MM_LOG ("Can't expunge because mailbox is in use by another process",
ERROR);
unlockfd (ld,lock); /* release exclusive parse/append permission */
}
else {
MM_CRITICAL (stream); /* go critical */
recent = stream->recent; /* get recent now that pinged and locked */
/* for each message */
while (i <= stream->nmsgs) {
/* get cache element */
elt = tenex_elt (stream,i);
/* number of bytes to smash or preserve */
k = elt->private.special.text.size + tenex_size (stream,i);
/* if need to expunge this message */
if (elt->deleted && (sequence ? elt->sequence : T)) {
/* if recent, note one less recent message */
if (elt->recent) --recent;
delta += k; /* number of bytes to delete */
/* notify upper levels */
mail_expunged (stream,i);
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 */
lseek (LOCAL->fd,pos,L_SET);
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 %lu != %lu, delta = %lu",
(unsigned long) pos,(unsigned long) LOCAL->filesize,delta);
MM_LOG (LOCAL->buf,WARN);
LOCAL->filesize = pos;/* fix it then */
}
ftruncate (LOCAL->fd,LOCAL->filesize);
sprintf (LOCAL->buf,"Expunged %lu 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 */
tp[1] = LOCAL->filetime = sbuf.st_mtime;
tp[0] = time (0); /* reset atime to now */
utime (stream->mailbox,tp);
MM_NOCRITICAL (stream); /* release critical */
/* notify upper level of new mailbox size */
mail_exists (stream,stream->nmsgs);
mail_recent (stream,recent);
(*bn) (BLOCK_FILELOCK,NIL);
flock (LOCAL->fd,LOCK_SH);/* allow sharers again */
(*bn) (BLOCK_NONE,NIL);
unlockfd (ld,lock); /* release exclusive parse/append permission */
}
}
return LONGT;
}
/* Tenex mail copy message(s)
* Accepts: MAIL stream
* sequence
* destination mailbox
* copy options
* Returns: T if success, NIL if failed
*/
long tenex_copy (MAILSTREAM *stream,char *sequence,char *mailbox,long options)
{
struct stat sbuf;
time_t tp[2];
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 (!tenex_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 EACCES: /* file protected */
sprintf (LOCAL->buf,"Can't access destination: %.80s",mailbox);
MM_LOG (LOCAL->buf,ERROR);
return NIL;
case EINVAL:
if (pc) return (*pc) (stream,sequence,mailbox,options);
sprintf (LOCAL->buf,"Invalid Tenex-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 Tenex-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 (tenex_file(file,mailbox),O_RDWR,NIL)) < 0) {
sprintf (LOCAL->buf,"Unable to open copy mailbox: %s",strerror (errno));
MM_LOG (LOCAL->buf,ERROR);
return NIL;
}
MM_CRITICAL (stream); /* go critical */
/* get exclusive parse/append permission */
if (flock (fd,LOCK_SH) || ((ld = lockfd (fd,lock,LOCK_EX)) < 0)) {
MM_LOG ("Unable to lock copy mailbox",ERROR);
MM_NOCRITICAL (stream);
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 + tenex_size (stream,i);
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);
}
if (ret) tp[0] = time (0) - 1;/* set atime to now-1 if successful copy */
/* else preserve \Marked status */
else tp[0] = (sbuf.st_ctime > sbuf.st_atime) ? sbuf.st_atime : time(0);
tp[1] = sbuf.st_mtime; /* preserve mtime */
utime (file,tp); /* set the times */
close (fd); /* close the file */
unlockfd (ld,lock); /* release exclusive parse/append permission */
MM_NOCRITICAL (stream); /* release critical */
/* delete all requested messages */
if (ret && (options & CP_MOVE)) {
for (i = 1; i <= stream->nmsgs; i++)
if ((elt = tenex_elt (stream,i))->sequence) {
elt->deleted = T; /* mark message deleted */
/* recalculate status */
tenex_update_status (stream,i,NIL);
}
if (!stream->rdonly) { /* make sure the update takes */
fsync (LOCAL->fd);
fstat (LOCAL->fd,&sbuf); /* get current write time */
tp[1] = LOCAL->filetime = sbuf.st_mtime;
tp[0] = time (0); /* make sure atime remains greater */
utime (stream->mailbox,tp);
}
}
if (ret && mail_parameters (NIL,GET_COPYUID,NIL))
MM_LOG ("Can not return meaningful COPYUID with this mailbox format",WARN);
return ret;
}
/* Tenex mail append message from stringstruct
* Accepts: MAIL stream
* destination mailbox
* append callback
* data for callback
* Returns: T if append successful, else NIL
*/
long tenex_append (MAILSTREAM *stream,char *mailbox,append_t af,void *data)
{
struct stat sbuf;
int fd,ld,c;
char *flags,*date,tmp[MAILTMPLEN],file[MAILTMPLEN],lock[MAILTMPLEN];
time_t tp[2];
FILE *df;
MESSAGECACHE elt;
long f;
unsigned long i,j,uf,size;
STRING *message;
long ret = LONGT;
/* default stream to prototype */
if (!stream) stream = user_flags (&tenexproto);
/* make sure valid mailbox */
if (!tenex_isvalid (mailbox,tmp)) switch (errno) {
case ENOENT: /* no such file? */
if (!compare_cstring (mailbox,"INBOX")) dummy_create (NIL,"mail.txt");
else {
MM_NOTIFY (stream,"[TRYCREATE] Must create mailbox before append",NIL);
return NIL;
}
/* falls through */
case 0: /* merely empty file? */
break;
case EACCES: /* file protected */
sprintf (tmp,"Can't access destination: %.80s",mailbox);
MM_LOG (tmp,ERROR);
return NIL;
case EINVAL:
sprintf (tmp,"Invalid TENEX-format mailbox name: %.80s",mailbox);
MM_LOG (tmp,ERROR);
return NIL;
default:
sprintf (tmp,"Not a TENEX-format mailbox: %.80s",mailbox);
MM_LOG (tmp,ERROR);
return NIL;
}
/* get first message */
if (!MM_APPEND (af) (stream,data,&flags,&date,&message)) return NIL;
/* open destination mailbox */
if (((fd = open (tenex_file (file,mailbox),O_WRONLY|O_APPEND,NIL)) < 0) ||
!(df = fdopen (fd,"ab"))) {
sprintf (tmp,"Can't open append mailbox: %s",strerror (errno));
MM_LOG (tmp,ERROR);
return NIL;
}
/* get parse/append permission */
if (flock (fd,LOCK_SH) || ((ld = lockfd (fd,lock,LOCK_EX)) < 0)) {
MM_LOG ("Unable to lock append mailbox",ERROR);
close (fd);
return NIL;
}
MM_CRITICAL (stream); /* go critical */
fstat (fd,&sbuf); /* get current file size */
errno = 0;
do { /* parse flags */
if (!SIZE (message)) { /* guard against zero-length */
MM_LOG ("Append of zero-length message",ERROR);
ret = NIL;
break;
}
f = mail_parse_flags (stream,flags,&i);
/* reverse bits (dontcha wish we had CIRC?) */
for (uf = 0; i; uf |= 1 << (29 - find_rightmost_bit (&i)));
if (date) { /* parse date if given */
if (!mail_parse_date (&elt,date)) {
sprintf (tmp,"Bad date in append: %.80s",date);
MM_LOG (tmp,ERROR);
ret = NIL; /* mark failure */
break;
}
mail_date (tmp,&elt); /* write preseved date */
}
else internal_date (tmp); /* get current date in IMAP format */
i = GETPOS (message); /* remember current position */
for (j = SIZE (message), size = 0; j; --j)
if (SNX (message) != '\015') ++size;
SETPOS (message,i); /* restore position */
/* write header */
if (fprintf (df,"%s,%lu;%010lo%02lo\n",tmp,size,uf,(unsigned long) f) < 0)
ret = NIL;
else { /* write message */
while (size) if ((c = 0xff & SNX (message)) != '\015') {
if (putc (c,df) != EOF) --size;
else break;
}
/* get next message */
if (size || !MM_APPEND (af) (stream,data,&flags,&date,&message))
ret = NIL;
}
} while (ret && message);
/* if error... */
if (!ret || (fflush (df) == EOF)) {
ftruncate (fd,sbuf.st_size);/* revert file */
close (fd); /* make sure fclose() doesn't corrupt us */
if (errno) {
sprintf (tmp,"Message append failed: %s",strerror (errno));
MM_LOG (tmp,ERROR);
}
ret = NIL;
}
if (ret) tp[0] = time (0) - 1;/* set atime to now-1 if successful copy */
/* else preserve \Marked status */
else tp[0] = (sbuf.st_ctime > sbuf.st_atime) ? sbuf.st_atime : time(0);
tp[1] = sbuf.st_mtime; /* preserve mtime */
utime (file,tp); /* set the times */
fclose (df); /* close the file */
unlockfd (ld,lock); /* release exclusive parse/append permission */
MM_NOCRITICAL (stream); /* release critical */
if (ret && mail_parameters (NIL,GET_APPENDUID,NIL))
MM_LOG ("Can not return meaningful APPENDUID with this mailbox format",
WARN);
return ret;
}
/* Internal routines */
/* Tenex mail return internal message size in bytes
* Accepts: MAIL stream
* message #
* Returns: internal size of message
*/
unsigned long tenex_size (MAILSTREAM *stream,unsigned long m)
{
MESSAGECACHE *elt = mail_elt (stream,m);
return ((m < stream->nmsgs) ? mail_elt (stream,m+1)->private.special.offset :
LOCAL->filesize) -
(elt->private.special.offset + elt->private.special.text.size);
}
/* Tenex mail generate file string
* Accepts: temporary buffer to write into
* mailbox name string
* Returns: local file string or NIL if failure
*/
char *tenex_file (char *dst,char *name)
{
char tmp[MAILTMPLEN];
char *s = mailboxfile (dst,name);
/* return our standard inbox */
return (s && !*s) ? mailboxfile (dst,tenex_isvalid ("~/INBOX",tmp) ?
"~/INBOX" : "mail.txt") : s;
}
/* Tenex mail parse mailbox
* Accepts: MAIL stream
* Returns: T if parse OK
* NIL if failure, stream aborted
*/
long tenex_parse (MAILSTREAM *stream)
{
struct stat sbuf;
MESSAGECACHE *elt = NIL;
unsigned 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 added = NIL;
short silent = stream->silent;
fstat (LOCAL->fd,&sbuf); /* get status */
if (sbuf.st_size < curpos) { /* sanity check */
sprintf (tmp,"Mailbox shrank from %lu to %lu!",
(unsigned long) curpos,(unsigned long) sbuf.st_size);
MM_LOG (tmp,ERROR);
tenex_close (stream,NIL);
return NIL;
}
stream->silent = T; /* don't pass up 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 %lu, size = %lu: %s",
(unsigned long) curpos,(unsigned long) sbuf.st_size,
i ? strerror (errno) : "no data read");
MM_LOG (tmp,ERROR);
tenex_close (stream,NIL);
return NIL;
}
LOCAL->buf[i] = '\0'; /* tie off buffer just in case */
if (!(s = strchr (LOCAL->buf,'\012'))) {
sprintf (tmp,"Unable to find newline at %lu in %lu bytes, text: %s",
(unsigned long) curpos,i,(char *) LOCAL->buf);
MM_LOG (tmp,ERROR);
tenex_close (stream,NIL);
return NIL;
}
*s = '\0'; /* tie off header line */
i = (s + 1) - LOCAL->buf; /* note start of text offset */
if (!((s = strchr (LOCAL->buf,',')) && (t = strchr (s+1,';')))) {
sprintf (tmp,"Unable to parse internal header at %lu: %s",
(unsigned long) curpos,(char *) LOCAL->buf);
MM_LOG (tmp,ERROR);
tenex_close (stream,NIL);
return NIL;
}
*s++ = '\0'; *t++ = '\0'; /* tie off fields */
added = T; /* note that a new message was added */
/* 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;
x = s; /* parse the header components */
if (mail_parse_date (elt,LOCAL->buf) &&
(elt->private.msg.full.text.size = strtoul (s,(char **) &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;
else { /* oops */
sprintf (tmp,"Unable to parse internal header elements at %ld: %s,%s;%s",
curpos,(char *) LOCAL->buf,(char *) x,(char *) t);
MM_LOG (tmp,ERROR);
tenex_close (stream,NIL);
return NIL;
}
/* make sure didn't run off end of file */
if ((curpos += (elt->private.msg.full.text.size + i)) > sbuf.st_size) {
sprintf (tmp,"Last message (at %lu) runs past end of file (%lu > %lu)",
elt->private.special.offset,(unsigned long) curpos,
(unsigned long) sbuf.st_size);
MM_LOG (tmp,ERROR);
tenex_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 */
tenex_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;
if (added && !stream->rdonly){/* make sure atime updated */
time_t tp[2];
tp[0] = time (0);
tp[1] = LOCAL->filetime;
utime (stream->mailbox,tp);
}
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 */
}
/* Tenex get cache element with status updating from file
* Accepts: MAIL stream
* message number
* Returns: cache element
*/
MESSAGECACHE *tenex_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;
tenex_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;
}
/* Tenex read flags from file
* Accepts: MAIL stream
* Returns: cache element
*/
void tenex_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 - 13,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 */
}
/* Tenex update status string
* Accepts: MAIL stream
* message number
* flag saying whether or not to sync
*/
void tenex_update_status (MAILSTREAM *stream,unsigned long msgno,long syncflag)
{
time_t tp[2];
struct stat sbuf;
MESSAGECACHE *elt = mail_elt (stream,msgno);
unsigned long j,k = 0;
/* readonly */
if (stream->rdonly || !elt->valid) tenex_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,(unsigned)
(fOLD + (fSEEN * elt->seen) + (fDELETED * elt->deleted) +
(fFLAGGED * elt->flagged) + (fANSWERED * elt->answered) +
(fDRAFT * elt->draft)));
/* get to that place in the file */
lseek (LOCAL->fd,(off_t) elt->private.special.offset +
elt->private.special.text.size - 13,L_SET);
/* write new flags */
write (LOCAL->fd,LOCAL->buf,12);
if (syncflag) { /* sync if requested */
fsync (LOCAL->fd);
fstat (LOCAL->fd,&sbuf); /* get new write time */
tp[1] = LOCAL->filetime = sbuf.st_mtime;
tp[0] = time (0); /* make sure read is later */
utime (stream->mailbox,tp);
}
}
}
/* Tenex locate header for a message
* Accepts: MAIL stream
* message number
* pointer to returned header size
* Returns: position of header in file
*/
unsigned long tenex_hdrpos (MAILSTREAM *stream,unsigned long msgno,
unsigned long *size)
{
unsigned long siz;
long i = 0;
char c = '\0';
char *s = NIL;
MESSAGECACHE *elt = tenex_elt (stream,msgno);
unsigned long ret = elt->private.special.offset +
elt->private.special.text.size;
unsigned long msiz = tenex_size (stream,msgno);
/* is header size known? */
if (!(*size = elt->private.msg.header.text.size)) {
lseek (LOCAL->fd,ret,L_SET);/* get to header position */
/* search message for LF LF */
for (siz = 0; siz < msiz; siz++) {
if (--i <= 0) /* read another buffer as necessary */
read (LOCAL->fd,s = LOCAL->buf,i = min (msiz-siz,(long) MAILTMPLEN));
/* two newline sequence? */
if ((c == '\012') && (*s == '\012')) {
/* yes, note for later */
elt->private.msg.header.text.size = (*size = siz + 1);
return ret; /* return to caller */
}
else c = *s++; /* next character */
}
/* header consumes entire message */
elt->private.msg.header.text.size = *size = msiz;
}
return ret;
}
yuuji@gentei.org