shell bypass 403
/* ========================================================================
* 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: 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: 15 June 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.
*/
#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 "misc.h"
#include "dummy.h"
#include "fdstring.h"
/* MTX I/O stream local data */
typedef struct mtx_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; /* last snarf time */
unsigned char *buf; /* temporary buffer */
unsigned long buflen; /* current size of temporary buffer */
} MTXLOCAL;
/* Convenient access to local data */
#define LOCAL ((MTXLOCAL *) stream->local)
/* Function prototypes */
DRIVER *mtx_valid (char *name);
int mtx_isvalid (char *name,char *file);
void *mtx_parameters (long function,void *value);
void mtx_scan (MAILSTREAM *stream,char *ref,char *pat,char *contents);
void mtx_list (MAILSTREAM *stream,char *ref,char *pat);
void mtx_lsub (MAILSTREAM *stream,char *ref,char *pat);
long mtx_create (MAILSTREAM *stream,char *mailbox);
long mtx_delete (MAILSTREAM *stream,char *mailbox);
long mtx_rename (MAILSTREAM *stream,char *old,char *newname);
long mtx_status (MAILSTREAM *stream,char *mbx,long flags);
MAILSTREAM *mtx_open (MAILSTREAM *stream);
void mtx_close (MAILSTREAM *stream,long options);
void mtx_flags (MAILSTREAM *stream,char *sequence,long flags);
char *mtx_header (MAILSTREAM *stream,unsigned long msgno,
unsigned long *length,long flags);
long mtx_text (MAILSTREAM *stream,unsigned long msgno,STRING *bs,long flags);
void mtx_flag (MAILSTREAM *stream,char *sequence,char *flag,long flags);
void mtx_flagmsg (MAILSTREAM *stream,MESSAGECACHE *elt);
long mtx_ping (MAILSTREAM *stream);
void mtx_check (MAILSTREAM *stream);
void mtx_snarf (MAILSTREAM *stream);
long mtx_expunge (MAILSTREAM *stream,char *sequence,long options);
long mtx_copy (MAILSTREAM *stream,char *sequence,char *mailbox,long options);
long mtx_append (MAILSTREAM *stream,char *mailbox,append_t af,void *data);
long mtx_parse (MAILSTREAM *stream);
MESSAGECACHE *mtx_elt (MAILSTREAM *stream,unsigned long msgno);
void mtx_read_flags (MAILSTREAM *stream,MESSAGECACHE *elt);
void mtx_update_status (MAILSTREAM *stream,unsigned long msgno,long syncflag);
unsigned long mtx_hdrpos (MAILSTREAM *stream,unsigned long msgno,
unsigned long *size);
/* 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 */
mail_status_default, /* 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
* buffer to return file name
* Returns: T if valid, NIL otherwise
*/
int mtx_isvalid (char *name,char *file)
{
int fd;
int ret = NIL;
char *s,tmp[MAILTMPLEN];
struct stat sbuf;
struct utimbuf times;
errno = EINVAL; /* assume invalid argument */
/* if file, get its status */
if ((s = dummy_file (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+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) {
/* 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) && !compare_cstring (name,"INBOX")) 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)
{
char *s,mbx[MAILTMPLEN];
if (s = dummy_file (mbx,mailbox)) return dummy_create (stream,s);
sprintf (mbx,"Can't create %.80s: invalid name",mailbox);
mm_log (mbx,ERROR);
return NIL;
}
/* 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 = LONGT;
char c,*s,tmp[MAILTMPLEN],file[MAILTMPLEN],lock[MAILTMPLEN];
int fd,ld;
struct stat sbuf;
if (!dummy_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;
}
if ((fd = open (file,O_BINARY|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 = lockname (lock,file,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? */
/* found superior to destination name? */
if ((s = strrchr (tmp,'\\')) && (s != tmp) &&
((tmp[1] != ':') || (s != tmp + 2))) {
c = s[1]; /* remember character after delimiter */
*s = s[1] = '\0'; /* tie off name at delimiter */
/* name doesn't exist, create it */
if (stat (tmp,&sbuf) || ((sbuf.st_mode & S_IFMT) != S_IFDIR)) {
*s = '\\'; /* restore delimiter */
if (!dummy_create (stream,tmp)) ret = NIL;
}
else *s = '\\'; /* restore delimiter */
s[1] = c; /* restore character after delimiter */
}
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");
/* canonicalize the mailbox name */
if (!dummy_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_BINARY|O_RDWR,NIL)) < 0) {
if ((fd = open (tmp,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->fd = fd; /* bind the file */
LOCAL->buf = (char *) fs_get (CHUNKSIZE);
LOCAL->buflen = CHUNKSIZE - 1;
/* note if an INBOX or not */
stream->inbox = !compare_cstring (stream->mailbox,"INBOX");
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,LOCK_SH); /* 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 = (unsigned long) 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,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);
/* 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)
{
FDDATA d;
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,NIL);
mm_flags (stream,msgno);
}
/* find header position */
i = mtx_hdrpos (stream,msgno,&j);
d.fd = LOCAL->fd; /* set up file descriptor */
d.pos = i + j;
d.chunk = LOCAL->buf; /* initial buffer chunk */
d.chunksize = CHUNKSIZE;
INIT (bs,fd_string,&d,elt->rfc822_size - j);
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 utimbuf times;
struct stat sbuf;
if (!stream->rdonly) { /* make sure the update takes */
fsync (LOCAL->fd);
fstat (LOCAL->fd,&sbuf); /* get current write time */
times.modtime = LOCAL->filetime = sbuf.st_mtime;
times.actime = time (0); /* make sure read comes after all that */
utime (stream->mailbox,×);
}
}
/* 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) {
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) 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 */
}
}
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
* sequence to expunge if non-NIL
* expunge options
* Returns: T, always
*/
long mtx_expunge (MAILSTREAM *stream,char *sequence,long options)
{
long ret;
struct utimbuf times;
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;
if (!(ret = (sequence ? ((options & EX_UID) ?
mail_uid_sequence (stream,sequence) :
mail_sequence (stream,sequence)) : LONGT) &&
mtx_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;
}
/* get exclusive parse/append permission */
if ((ld = lockname (lock,stream->mailbox,LOCK_EX)) < 0)
mm_log ("Unable to lock expunge mailbox",ERROR);
/* make sure see any newly-arrived messages */
else if (!mtx_parse (stream));
/* get exclusive access */
else 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 */
}
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 = mtx_elt (stream,i);
/* number of bytes to smash or preserve */
k = elt->private.special.text.size + elt->rfc822_size;
/* 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 */
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 */
times.modtime = LOCAL->filetime = sbuf.st_mtime;
times.actime = time (0); /* reset atime to now */
utime (stream->mailbox,×);
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 */
}
}
return ret;
}
/* 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,file)) 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 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 (file,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 (flock (fd,LOCK_SH) || ((ld = lockname (lock,file,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 + 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);
}
/* set atime to now-1 if successful copy */
if (ret) times.actime = time (0) - 1;
/* else preserved \Marked status */
else times.actime = (sbuf.st_ctime > sbuf.st_atime) ?
sbuf.st_atime : time (0);
times.modtime = sbuf.st_mtime;/* preserve 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 */
times.modtime = LOCAL->filetime = sbuf.st_mtime;
times.actime = time (0); /* make sure atime remains greater */
utime (stream->mailbox,×);
}
}
if (ret && mail_parameters (NIL,GET_COPYUID,NIL))
mm_log ("Can not return meaningful COPYUID with this mailbox format",WARN);
return ret;
}
/* MTX mail append message from stringstruct
* Accepts: MAIL stream
* destination mailbox
* append callback
* data for callback
* Returns: T if append successful, else NIL
*/
long mtx_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];
struct utimbuf times;
FILE *df;
MESSAGECACHE elt;
long f;
unsigned long i,uf;
STRING *message;
long ret = LONGT;
/* default stream to prototype */
if (!stream) stream = &mtxproto;
/* make sure valid mailbox */
if (!mtx_isvalid (mailbox,file)) switch (errno) {
case ENOENT: /* no such file? */
if (!compare_cstring (mailbox,"INBOX")) 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 EACCES: /* file protected */
sprintf (tmp,"Can't access destination: %.80s",mailbox);
MM_LOG (tmp,ERROR);
return NIL;
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;
}
/* get first message */
if (!(*af) (stream,data,&flags,&date,&message)) return NIL;
/* open destination mailbox */
if (((fd = open (file,O_BINARY|O_WRONLY|O_APPEND|O_CREAT,S_IREAD|S_IWRITE))
< 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 = lockname (lock,file,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 */
/* write header */
if (fprintf (df,"%s,%lu;%010lo%02lo\015\012",tmp,i = SIZE (message),uf,
(unsigned long) f) < 0) ret = NIL;
else { /* write message */
if (i) do c = 0xff & SNX (message);
while ((putc (c,df) != EOF) && --i);
/* get next message */
if (i || !(*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) times.actime = time (0) - 1;
/* else preserved \Marked status */
else times.actime = (sbuf.st_ctime > sbuf.st_atime) ?
sbuf.st_atime : time (0);
times.modtime = sbuf.st_mtime;/* preserve mtime */
utime (file,×); /* 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 */
/* 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;
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 %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 %lu, size = %lu: %s",
(unsigned long) curpos,(unsigned long) 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 %lu in %lu bytes, text: %s",
(unsigned long) curpos,i,(char *) 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 %lu: %s",
(unsigned long) curpos,(char *) LOCAL->buf);
mm_log (tmp,ERROR);
mtx_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->rfc822_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);
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,(unsigned long) curpos,
(unsigned long) 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;
if (added && !stream->rdonly){/* make sure atime updated */
struct utimbuf times;
times.actime = time (0);
times.modtime = LOCAL->filetime;
utime (stream->mailbox,×);
}
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)
{
struct utimbuf times;
struct stat sbuf;
MESSAGECACHE *elt = mail_elt (stream,msgno);
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,(unsigned)
(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 */
times.modtime = LOCAL->filetime = sbuf.st_mtime;
times.actime = time (0); /* make sure read is later */
utime (stream->mailbox,×);
}
}
}
/* 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);
unsigned long ret = elt->private.special.offset +
elt->private.special.text.size;
/* 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 CRLF CRLF */
for (siz = 1,s = tmp; siz <= elt->rfc822_size; siz++) {
/* read another buffer as necessary */
if ((--i <= 0) && /* buffer empty? */
(read (LOCAL->fd,s = tmp,
i = min (elt->rfc822_size - siz,(long) MAILTMPLEN)) < 0))
return ret; /* I/O error? */
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 ret;
}
q = 0; /* lost... */
break;
}
}
/* header consumes entire message */
elt->private.msg.header.text.size = *size = elt->rfc822_size;
}
return ret;
}