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unix.c
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C/C++ Source or Header
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1999-01-22
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61KB
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1,791 lines
/*
* Program: UNIX 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: 20 December 1989
* Last Edited: 22 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.
*
*/
/* DEDICATION
*
* This file is dedicated to my dog, Unix, also known as Yun-chan and
* Unix J. Terwilliker Jehosophat Aloysius Monstrosity Animal Beast. Unix
* passed away at the age of 11 1/2 on September 14, 1996, 12:18 PM PDT, after
* a two-month bout with cirrhosis of the liver.
*
* He was a dear friend, and I miss him terribly.
*
* Lift a leg, Yunie. Luv ya forever!!!!
*/
#include <stdio.h>
#include <ctype.h>
#include <errno.h>
extern int errno; /* just in case */
#include <signal.h>
#include "mail.h"
#include "osdep.h"
#include <time.h>
#include <sys/stat.h>
#include "unix.h"
#include "pseudo.h"
#include "fdstring.h"
#include "misc.h"
#include "dummy.h"
/* UNIX mail routines */
/* Driver dispatch used by MAIL */
DRIVER unixdriver = {
"unix", /* driver name */
DR_LOCAL|DR_MAIL, /* driver flags */
(DRIVER *) NIL, /* next driver */
unix_valid, /* mailbox is valid for us */
unix_parameters, /* manipulate parameters */
unix_scan, /* scan mailboxes */
unix_list, /* list mailboxes */
unix_lsub, /* list subscribed mailboxes */
NIL, /* subscribe to mailbox */
NIL, /* unsubscribe from mailbox */
unix_create, /* create mailbox */
unix_delete, /* delete mailbox */
unix_rename, /* rename mailbox */
NIL, /* status of mailbox */
unix_open, /* open mailbox */
unix_close, /* close mailbox */
NIL, /* fetch message "fast" attributes */
NIL, /* fetch message flags */
NIL, /* fetch overview */
NIL, /* fetch message envelopes */
unix_header, /* fetch message header */
unix_text, /* fetch message text */
NIL, /* fetch partial message text */
NIL, /* unique identifier */
NIL, /* message number */
NIL, /* modify flags */
unix_flagmsg, /* per-message modify flags */
NIL, /* search for message based on criteria */
NIL, /* sort messages */
NIL, /* thread messages */
unix_ping, /* ping mailbox to see if still alive */
unix_check, /* check for new messages */
unix_expunge, /* expunge deleted messages */
unix_copy, /* copy messages to another mailbox */
unix_append, /* append string message to mailbox */
NIL /* garbage collect stream */
};
/* prototype stream */
MAILSTREAM unixproto = {&unixdriver};
/* driver parameters */
static long unix_fromwidget = T;
/* UNIX mail validate mailbox
* Accepts: mailbox name
* Returns: our driver if name is valid, NIL otherwise
*/
DRIVER *unix_valid (char *name)
{
char tmp[MAILTMPLEN];
return unix_isvalid (name,tmp) ? &unixdriver : NIL;
}
/* UNIX mail test for valid mailbox name
* Accepts: mailbox name
* scratch buffer
* Returns: T if valid, NIL otherwise
*/
long unix_isvalid (char *name,char *tmp)
{
int fd;
int ret = NIL;
char *t,file[MAILTMPLEN];
struct stat sbuf;
time_t tp[2];
errno = EINVAL; /* assume invalid argument */
/* must be non-empty file */
if ((t = dummy_file (file,name)) && !stat (t,&sbuf)) {
if (!sbuf.st_size)errno = 0;/* empty file */
else if ((fd = open (file,O_RDONLY,NIL)) >= 0) {
/* error -1 for invalid format */
if (!(ret = unix_isvalid_fd (fd,tmp))) errno = -1;
close (fd); /* close the file */
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 unix 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 */
}
/* UNIX mail test for valid mailbox
* Accepts: file descriptor
* scratch buffer
* Returns: T if valid, NIL otherwise
*/
long unix_isvalid_fd (int fd,char *tmp)
{
int zn;
int ret = NIL;
char *s,*t,c = '\n';
memset (tmp,'\0',MAILTMPLEN);
if (read (fd,tmp,MAILTMPLEN-1) >= 0) {
for (s = tmp; (*s == '\n') || (*s == ' ') || (*s == '\t');) c = *s++;
if (c == '\n') VALID (s,t,ret,zn);
}
return ret; /* return what we should */
}
/* UNIX manipulate driver parameters
* Accepts: function code
* function-dependent value
* Returns: function-dependent return value
*/
void *unix_parameters (long function,void *value)
{
switch ((int) function) {
case SET_FROMWIDGET:
unix_fromwidget = (long) value;
break;
case GET_FROMWIDGET:
value = (void *) unix_fromwidget;
break;
default:
value = NIL; /* error case */
break;
}
return value;
}
/* UNIX mail scan mailboxes
* Accepts: mail stream
* reference
* pattern to search
* string to scan
*/
void unix_scan (MAILSTREAM *stream,char *ref,char *pat,char *contents)
{
if (stream) dummy_scan (NIL,ref,pat,contents);
}
/* UNIX mail list mailboxes
* Accepts: mail stream
* reference
* pattern to search
*/
void unix_list (MAILSTREAM *stream,char *ref,char *pat)
{
if (stream) dummy_list (NIL,ref,pat);
}
/* UNIX mail list subscribed mailboxes
* Accepts: mail stream
* reference
* pattern to search
*/
void unix_lsub (MAILSTREAM *stream,char *ref,char *pat)
{
if (stream) dummy_lsub (NIL,ref,pat);
}
/* UNIX mail create mailbox
* Accepts: MAIL stream
* mailbox name to create
* Returns: T on success, NIL on failure
*/
long unix_create (MAILSTREAM *stream,char *mailbox)
{
char *s,*t,mbx[MAILTMPLEN],tmp[MAILTMPLEN];
long ret = NIL;
int i,fd;
time_t ti = time (0);
if (!(s = dummy_file (mbx,mailbox))) {
sprintf (tmp,"Can't create %.80s: invalid name",mailbox);
mm_log (tmp,ERROR);
}
/* create underlying file */
else if (dummy_create_path (stream,s)) {
/* done if made directory */
if ((s = strrchr (s,'/')) && !s[1]) ret = T;
else if ((fd = open (mbx,O_WRONLY,
(int) mail_parameters(NIL,GET_MBXPROTECTION,NIL)))<0){
sprintf (tmp,"Can't reopen mailbox node %.80s: %s",mbx,strerror (errno));
mm_log (tmp,ERROR);
unlink (mbx); /* delete the file */
}
/* in case a whiner with no life */
else if (mail_parameters (NIL,GET_USERHASNOLIFE,NIL)) ret = T;
else { /* initialize header */
memset (tmp,'\0',MAILTMPLEN);
sprintf (tmp,"From %s %sDate: ",pseudo_from,ctime (&ti));
rfc822_date (s = tmp + strlen (tmp));
/* write the pseudo-header */
sprintf (s += strlen (s),
"\nFrom: %s <%s@%s>\nSubject: %s\nX-IMAP: %010lu 0000000000",
pseudo_name,pseudo_from,mylocalhost (),pseudo_subject,ti);
for (i = 0; i < NUSERFLAGS; ++i) if (default_user_flag (i))
sprintf (s += strlen (s)," %s",default_user_flag (i));
sprintf (s += strlen (s),"\nStatus: RO\n\n%s\n\n",pseudo_msg);
if ((write (fd,tmp,strlen (tmp)) < 0) || close (fd)) {
sprintf (tmp,"Can't initialize mailbox node %.80s: %s",mbx,
strerror (errno));
mm_log (tmp,ERROR);
unlink (mbx); /* delete the file */
}
else ret = T; /* success */
}
}
return ret ? set_mbx_protections (mailbox,mbx) : NIL;
}
/* UNIX mail delete mailbox
* Accepts: MAIL stream
* mailbox name to delete
* Returns: T on success, NIL on failure
*/
long unix_delete (MAILSTREAM *stream,char *mailbox)
{
return unix_rename (stream,mailbox,NIL);
}
/* UNIX mail rename mailbox
* Accepts: MAIL stream
* old mailbox name
* new mailbox name (or NIL for delete)
* Returns: T on success, NIL on failure
*/
long unix_rename (MAILSTREAM *stream,char *old,char *newname)
{
long ret = NIL;
char c,*s;
char tmp[MAILTMPLEN],file[MAILTMPLEN],lock[MAILTMPLEN],lockx[MAILTMPLEN];
int fd,ld;
struct stat sbuf;
mm_critical (stream); /* get the c-client lock */
if (newname && !((s = dummy_file (tmp,newname)) && *s))
sprintf (tmp,"Can't rename mailbox %.80s to %.80s: invalid name",
old,newname);
/* lock out other c-clients */
else if ((ld = lockname (lock,dummy_file (file,old),LOCK_EX|LOCK_NB)) < 0)
sprintf (tmp,"Mailbox %.80s is in use by another process",old);
else {
if ((fd = unix_lock (file,O_RDWR,S_IREAD|S_IWRITE,lockx,LOCK_EX)) < 0)
sprintf (tmp,"Can't lock mailbox %.80s: %s",old,strerror (errno));
else {
if (newname) { /* want rename? */
/* found superior to destination name? */
if (s = strrchr (s,'/')) {
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)) {
unix_unlock (fd,NIL,lockx);
flock (ld,LOCK_UN); /* release c-client lock */
close (ld); /* close c-client lock */
unlink (lock); /* and delete it */
mm_nocritical (stream);
return ret; /* return success or failure */
}
*s = c; /* restore full name */
}
if (rename (file,tmp))
sprintf (tmp,"Can't rename mailbox %.80s to %.80s: %s",old,newname,
strerror (errno));
else ret = T; /* set success */
}
else if (unlink (file))
sprintf (tmp,"Can't delete mailbox %.80s: %s",old,strerror (errno));
else ret = T; /* set success */
unix_unlock (fd,NIL,lockx);
}
flock (ld,LOCK_UN); /* release c-client lock */
close (ld); /* close c-client lock */
unlink (lock); /* and delete it */
}
mm_nocritical (stream); /* no longer critical */
if (!ret) mm_log (tmp,ERROR); /* log error */
return ret; /* return success or failure */
}
/* UNIX mail open
* Accepts: Stream to open
* Returns: Stream on success, NIL on failure
*/
MAILSTREAM *unix_open (MAILSTREAM *stream)
{
long i;
int fd;
char tmp[MAILTMPLEN];
struct stat sbuf;
long retry;
/* return prototype for OP_PROTOTYPE call */
if (!stream) return user_flags (&unixproto);
retry = stream->silent ? 1 : KODRETRY;
if (stream->local) fatal ("unix recycle stream");
stream->local = memset (fs_get (sizeof (UNIXLOCAL)),0,sizeof (UNIXLOCAL));
/* canonicalize the stream mailbox name */
dummy_file (tmp,stream->mailbox);
/* flush old name */
fs_give ((void **) &stream->mailbox);
/* save canonical name */
stream->mailbox = cpystr (tmp);
LOCAL->fd = LOCAL->ld = -1; /* no file or state locking yet */
LOCAL->buf = (char *) fs_get ((LOCAL->buflen = CHUNK) + 1);
stream->sequence++; /* bump sequence number */
/* make lock for read/write access */
if (!stream->rdonly) while (retry) {
/* try to lock file */
if ((fd = lockname (tmp,stream->mailbox,LOCK_EX|LOCK_NB)) < 0) {
if (retry-- == KODRETRY) {/* no, first time through? */
/* yes, get other process' PID */
if (!fstat (fd,&sbuf) && (i = min (sbuf.st_size,MAILTMPLEN)) &&
(read (fd,tmp,i) == i) && !(tmp[i] = 0) && (i = atol (tmp))) {
kill ((int) i,SIGUSR2);
sprintf (tmp,"Trying to get mailbox lock from process %lu",i);
mm_log (tmp,WARN);
}
else retry = 0; /* give up */
}
if (!stream->silent) { /* nothing if silent stream */
if (retry) sleep (1); /* wait a second before trying again */
else mm_log ("Mailbox is open by another process, access is readonly",
WARN);
}
}
else { /* got the lock, nobody else can alter state */
LOCAL->ld = fd; /* note lock's fd and name */
LOCAL->lname = cpystr (tmp);
/* make sure mode OK (don't use fchmod()) */
chmod (LOCAL->lname,(int) mail_parameters (NIL,GET_LOCKPROTECTION,NIL));
if (stream->silent) i = 0;/* silent streams won't accept KOD */
else { /* note our PID in the lock */
sprintf (tmp,"%d",getpid ());
write (fd,tmp,(i = strlen (tmp))+1);
}
ftruncate (fd,i); /* make sure tied off */
fsync (fd); /* make sure it's available */
retry = 0; /* no more need to try */
}
}
/* parse mailbox */
stream->nmsgs = stream->recent = 0;
/* will we be able to get write access? */
if ((LOCAL->ld >= 0) && access (stream->mailbox,W_OK) && (errno == EACCES)) {
mm_log ("Can't get write access to mailbox, access is readonly",WARN);
flock (LOCAL->ld,LOCK_UN); /* release the lock */
close (LOCAL->ld); /* close the lock file */
LOCAL->ld = -1; /* no more lock fd */
unlink (LOCAL->lname); /* delete it */
}
/* reset UID validity */
stream->uid_validity = stream->uid_last = 0;
if (stream->silent && !stream->rdonly && (LOCAL->ld < 0))
unix_abort (stream); /* abort if can't get RW silent stream */
/* parse mailbox */
else if (unix_parse (stream,tmp,LOCK_SH)) {
unix_unlock (LOCAL->fd,stream,tmp);
mail_unlock (stream);
mm_nocritical (stream); /* done with critical */
}
if (!LOCAL) return NIL; /* failure if stream died */
/* make sure upper level knows readonly */
stream->rdonly = (LOCAL->ld < 0);
/* notify about empty mailbox */
if (!(stream->nmsgs || stream->silent)) mm_log ("Mailbox is empty",NIL);
if (!stream->rdonly) { /* flags stick if readwrite */
stream->perm_seen = stream->perm_deleted =
stream->perm_flagged = stream->perm_answered = stream->perm_draft = T;
if (!stream->uid_nosticky) {/* users with lives get permanent keywords */
stream->perm_user_flags = 0xffffffff;
/* and maybe can create them too! */
stream->kwd_create = stream->user_flags[NUSERFLAGS-1] ? NIL : T;
}
}
return stream; /* return stream alive to caller */
}
/* UNIX mail close
* Accepts: MAIL stream
* close options
*/
void unix_close (MAILSTREAM *stream,long options)
{
int silent = stream->silent;
stream->silent = T; /* go silent */
/* expunge if requested */
if (options & CL_EXPUNGE) unix_expunge (stream);
/* else dump final checkpoint */
else if (LOCAL->dirty) unix_check (stream);
stream->silent = NIL; /* restore old silence state */
unix_abort (stream); /* now punt the file and local data */
}
/* UNIX mail fetch message header
* Accepts: MAIL stream
* message # to fetch
* pointer to returned header text length
* option flags
* Returns: message header in RFC822 format
*/
/* lines to filter from header */
static STRINGLIST *unix_hlines = NIL;
char *unix_header (MAILSTREAM *stream,unsigned long msgno,
unsigned long *length,long flags)
{
MESSAGECACHE *elt;
char *s;
*length = 0; /* default to empty */
if (flags & FT_UID) return "";/* UID call "impossible" */
elt = mail_elt (stream,msgno);/* get cache */
if (!unix_hlines) { /* once only code */
STRINGLIST *lines = unix_hlines = mail_newstringlist ();
lines->text.size = strlen ((char *) (lines->text.data =
(unsigned char *) "Status"));
lines = lines->next = mail_newstringlist ();
lines->text.size = strlen ((char *) (lines->text.data =
(unsigned char *) "X-Status"));
lines = lines->next = mail_newstringlist ();
lines->text.size = strlen ((char *) (lines->text.data =
(unsigned char *) "X-Keywords"));
lines = lines->next = mail_newstringlist ();
lines->text.size = strlen ((char *) (lines->text.data =
(unsigned char *) "X-UID"));
}
/* go to header position */
lseek (LOCAL->fd,elt->private.special.offset +
elt->private.msg.header.offset,L_SET);
if (flags & FT_INTERNAL) { /* initial data OK? */
if (elt->private.msg.header.text.size > LOCAL->buflen) {
fs_give ((void **) &LOCAL->buf);
LOCAL->buf = (char *) fs_get ((LOCAL->buflen =
elt->private.msg.header.text.size) + 1);
}
/* read message */
read (LOCAL->fd,LOCAL->buf,elt->private.msg.header.text.size);
/* got text, tie off string */
LOCAL->buf[*length = elt->private.msg.header.text.size] = '\0';
}
else { /* need to make a CRLF version */
read (LOCAL->fd,s = (char *) fs_get (elt->private.msg.header.text.size+1),
elt->private.msg.header.text.size);
/* tie off string, and convert to CRLF */
s[elt->private.msg.header.text.size] = '\0';
*length = strcrlfcpy (&LOCAL->buf,&LOCAL->buflen,s,
elt->private.msg.header.text.size);
fs_give ((void **) &s); /* free readin buffer */
}
*length = mail_filter (LOCAL->buf,*length,unix_hlines,FT_NOT);
return LOCAL->buf; /* return processed copy */
}
/* UNIX mail fetch message text
* Accepts: MAIL stream
* message # to fetch
* pointer to returned stringstruct
* option flags
* Returns: T on success, NIL if failure
*/
long unix_text (MAILSTREAM *stream,unsigned long msgno,STRING *bs,long flags)
{
char *s;
unsigned long i;
MESSAGECACHE *elt;
/* UID call "impossible" */
if (flags & FT_UID) return NIL;
elt = mail_elt (stream,msgno);/* get cache element */
/* if message not seen */
if (!(flags & FT_PEEK) && !elt->seen) {
elt->seen = T; /* mark message as seen */
LOCAL->dirty = T; /* note stream is now dirty */
mm_flags (stream,msgno);
}
s = unix_text_work (stream,elt,&i,flags);
INIT (bs,mail_string,s,i); /* set up stringstruct */
return T; /* success */
}
/* UNIX mail fetch message text worker routine
* Accepts: MAIL stream
* message cache element
* pointer to returned header text length
* option flags
*/
char *unix_text_work (MAILSTREAM *stream,MESSAGECACHE *elt,
unsigned long *length,long flags)
{
FDDATA d;
STRING bs;
char *s,tmp[CHUNK];
/* go to text position */
lseek (LOCAL->fd,elt->private.special.offset +
elt->private.msg.text.offset,L_SET);
if (flags & FT_INTERNAL) { /* initial data OK? */
if (elt->private.msg.text.text.size > LOCAL->buflen) {
fs_give ((void **) &LOCAL->buf);
LOCAL->buf = (char *) fs_get ((LOCAL->buflen =
elt->private.msg.text.text.size) + 1);
}
/* read message */
read (LOCAL->fd,LOCAL->buf,elt->private.msg.text.text.size);
/* got text, tie off string */
LOCAL->buf[*length = elt->private.msg.text.text.size] = '\0';
}
else { /* need to make a CRLF version */
if (elt->rfc822_size > LOCAL->buflen) {
/* excessively conservative, but the right thing is too hard to do */
fs_give ((void **) &LOCAL->buf);
LOCAL->buf = (char *) fs_get ((LOCAL->buflen = elt->rfc822_size) + 1);
}
d.fd = LOCAL->fd; /* yes, set up file descriptor */
d.pos = elt->private.special.offset + elt->private.msg.text.offset;
d.chunk = tmp; /* initial buffer chunk */
d.chunksize = CHUNK; /* file chunk size */
INIT (&bs,fd_string,&d,elt->private.msg.text.text.size);
for (s = LOCAL->buf; SIZE (&bs);) switch (CHR (&bs)) {
case '\015': /* carriage return seen */
*s++ = SNX (&bs); /* copy it and any succeeding LF */
if (SIZE (&bs) && (CHR (&bs) == '\012')) *s++ = SNX (&bs);
break;
case '\012':
*s++ = '\015'; /* insert a CR */
default:
*s++ = SNX (&bs); /* copy characters */
}
*s = '\0'; /* tie off buffer */
*length = s - LOCAL->buf; /* calculate length */
}
return LOCAL->buf;
}
/* UNIX per-message modify flag
* Accepts: MAIL stream
* message cache element
*/
void unix_flagmsg (MAILSTREAM *stream,MESSAGECACHE *elt)
{
/* only after finishing */
if (elt->valid) LOCAL->dirty = T;
}
/* UNIX mail ping mailbox
* Accepts: MAIL stream
* Returns: T if stream alive, else NIL
*/
long unix_ping (MAILSTREAM *stream)
{
char lock[MAILTMPLEN];
struct stat sbuf;
/* big no-op if not readwrite */
if (LOCAL && (LOCAL->ld >= 0) && !stream->lock) {
if (stream->rdonly) { /* does he want to give up readwrite? */
/* checkpoint if we changed something */
if (LOCAL->dirty) unix_check (stream);
flock (LOCAL->ld,LOCK_UN);/* release readwrite lock */
close (LOCAL->ld); /* close the readwrite lock file */
LOCAL->ld = -1; /* no more readwrite lock fd */
unlink (LOCAL->lname); /* delete the readwrite lock file */
}
else { /* get current mailbox size */
if (LOCAL->fd >= 0) fstat (LOCAL->fd,&sbuf);
else stat (stream->mailbox,&sbuf);
/* parse if mailbox changed */
if ((sbuf.st_size != LOCAL->filesize) &&
unix_parse (stream,lock,LOCK_SH)) {
/* unlock mailbox */
unix_unlock (LOCAL->fd,stream,lock);
mail_unlock (stream); /* and stream */
mm_nocritical (stream); /* done with critical */
}
}
}
return LOCAL ? LONGT : NIL; /* return if still alive */
}
/* UNIX mail check mailbox
* Accepts: MAIL stream
*/
void unix_check (MAILSTREAM *stream)
{
char lock[MAILTMPLEN];
/* parse and lock mailbox */
if (LOCAL && (LOCAL->ld >= 0) && !stream->lock &&
unix_parse (stream,lock,LOCK_EX)) {
/* any unsaved changes? */
if (LOCAL->dirty && unix_rewrite (stream,NIL)) {
unlink (lock); /* flush the lock file */
if (!stream->silent) mm_log ("Checkpoint completed",NIL);
}
/* no checkpoint needed, just unlock */
else unix_unlock (LOCAL->fd,stream,lock);
mail_unlock (stream); /* unlock the stream */
mm_nocritical (stream); /* done with critical */
}
}
/* UNIX mail expunge mailbox
* Accepts: MAIL stream
*/
void unix_expunge (MAILSTREAM *stream)
{
unsigned long i;
char lock[MAILTMPLEN];
char *msg = NIL;
/* parse and lock mailbox */
if (LOCAL && (LOCAL->ld >= 0) && !stream->lock &&
unix_parse (stream,lock,LOCK_EX)) {
/* count expunged messages if not dirty */
if (!LOCAL->dirty) for (i = 1; i <= stream->nmsgs; i++)
if (mail_elt (stream,i)->deleted) LOCAL->dirty = T;
if (!LOCAL->dirty) { /* not dirty and no expunged messages */
unix_unlock (LOCAL->fd,stream,lock);
msg = "No messages deleted, so no update needed";
}
else if (unix_rewrite (stream,&i)) {
unlink (lock); /* flush the lock file */
if (i) sprintf (msg = LOCAL->buf,"Expunged %lu messages",i);
else msg = "Mailbox checkpointed, but no messages expunged";
}
/* rewrite failed */
else unix_unlock (LOCAL->fd,stream,lock);
mail_unlock (stream); /* unlock the stream */
mm_nocritical (stream); /* done with critical */
if (msg && !stream->silent) mm_log (msg,NIL);
}
else if (!stream->silent) mm_log("Expunge ignored on readonly mailbox",WARN);
}
/* UNIX mail copy message(s)
* Accepts: MAIL stream
* sequence
* destination mailbox
* copy options
* Returns: T if copy successful, else NIL
*/
long unix_copy (MAILSTREAM *stream,char *sequence,char *mailbox,long options)
{
struct stat sbuf;
int fd;
char *s,file[MAILTMPLEN],lock[MAILTMPLEN];
time_t tp[2];
unsigned long i,j;
MESSAGECACHE *elt;
long ret = T;
mailproxycopy_t pc =
(mailproxycopy_t) mail_parameters (stream,GET_MAILPROXYCOPY,NIL);
if (!((options & CP_UID) ? mail_uid_sequence (stream,sequence) :
mail_sequence (stream,sequence))) return NIL;
/* make sure valid mailbox */
if (!unix_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 EINVAL:
if (pc) return (*pc) (stream,sequence,mailbox,options);
sprintf (LOCAL->buf,"Invalid UNIX-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 UNIX-format mailbox: %.80s",mailbox);
mm_log (LOCAL->buf,ERROR);
return NIL;
}
LOCAL->buf[0] = '\0';
mm_critical (stream); /* go critical */
if ((fd = unix_lock (dummy_file (file,mailbox),O_WRONLY|O_APPEND|O_CREAT,
S_IREAD|S_IWRITE,lock,LOCK_EX)) < 0) {
mm_nocritical (stream); /* done with critical */
sprintf (LOCAL->buf,"Can't open destination mailbox: %s",strerror (errno));
mm_log (LOCAL->buf,ERROR); /* log the error */
return NIL; /* failed */
}
fstat (fd,&sbuf); /* get current file size */
/* write all requested messages to mailbox */
for (i = 1; ret && (i <= stream->nmsgs); i++)
if ((elt = mail_elt (stream,i))->sequence) {
lseek (LOCAL->fd,elt->private.special.offset,L_SET);
read (LOCAL->fd,LOCAL->buf,elt->private.special.text.size);
if (write (fd,LOCAL->buf,elt->private.special.text.size) < 0) ret = NIL;
else { /* internal header succeeded */
s = unix_header (stream,i,&j,FT_INTERNAL);
/* header size, sans trailing newline */
if (j && (s[j - 2] == '\n')) j--;
if (write (fd,s,j) < 0) ret = NIL;
else { /* message header succeeded */
j = unix_xstatus (stream,LOCAL->buf,elt,NIL);
if (write (fd,LOCAL->buf,j) < 0) ret = NIL;
else { /* message status succeeded */
s = unix_text_work (stream,elt,&j,FT_INTERNAL);
if ((write (fd,s,j) < 0) || (write (fd,"\n",1) < 0)) ret = NIL;
}
}
}
}
if (!ret || fsync (fd)) { /* force out the update */
sprintf (LOCAL->buf,"Message copy failed: %s",strerror (errno));
ftruncate (fd,sbuf.st_size);
ret = NIL;
}
tp[0] = sbuf.st_atime; /* preserve atime */
tp[1] = time (0); /* set mtime to now */
utime (file,tp); /* set the times */
unix_unlock (fd,NIL,lock); /* unlock and close mailbox */
mm_nocritical (stream); /* release critical */
/* log the error */
if (!ret) mm_log (LOCAL->buf,ERROR);
/* delete if requested message */
else if (options & CP_MOVE) for (i = 1; i <= stream->nmsgs; i++)
if ((elt = mail_elt (stream,i))->sequence) {
elt->deleted = T; /* mark message deleted */
LOCAL->dirty = T; /* note stream is now dirty */
}
return ret;
}
/* UNIX mail append message from stringstruct
* Accepts: MAIL stream
* destination mailbox
* initial flags
* internal date
* stringstruct of messages to append
* Returns: T if append successful, else NIL
*/
#define BUFLEN 8*MAILTMPLEN
long unix_append (MAILSTREAM *stream,char *mailbox,char *flags,char *date,
STRING *message)
{
MESSAGECACHE elt;
struct stat sbuf;
int fd,ti,zn;
long f,i,ok;
unsigned long j,n,uf,size;
char c,*x,buf[BUFLEN],tmp[MAILTMPLEN],file[MAILTMPLEN],lock[MAILTMPLEN];
time_t tp[2],t = time (0);
/* default stream to prototype */
if (!stream) stream = user_flags (&unixproto);
/* get flags */
f = mail_parse_flags (stream,flags,&uf);
/* parse date */
if (!date) rfc822_date (date = tmp);
if (!mail_parse_date (&elt,date)) {
sprintf (buf,"Bad date in append: %.80s",date);
mm_log (buf,ERROR);
return NIL;
}
/* make sure valid mailbox */
if (!unix_isvalid (mailbox,buf)) 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])
unix_create (NIL,"INBOX");
else {
mm_notify (stream,"[TRYCREATE] Must create mailbox before append",NIL);
return NIL;
}
/* falls through */
case 0: /* INBOX ENOENT or empty file? */
break;
case EINVAL:
sprintf (buf,"Invalid UNIX-format mailbox name: %.80s",mailbox);
mm_log (buf,ERROR);
return NIL;
default:
sprintf (buf,"Not a UNIX-format mailbox: %.80s",mailbox);
mm_log (buf,ERROR);
return NIL;
}
mm_critical (stream); /* go critical */
if ((fd = unix_lock (dummy_file (file,mailbox),O_WRONLY|O_APPEND|O_CREAT,
S_IREAD|S_IWRITE,lock,LOCK_EX)) < 0) {
mm_nocritical (stream); /* done with critical */
sprintf (buf,"Can't open append mailbox: %s",strerror (errno));
mm_log (buf,ERROR);
return NIL;
}
fstat (fd,&sbuf); /* get current file size */
sprintf (buf,"From %s@%s ",myusername (),mylocalhost ());
/* write the date given */
mail_cdate (buf + strlen (buf),&elt);
sprintf (buf + strlen (buf),"Status: %s\nX-Status: %s%s%s%s\nX-Keywords:",
f&fSEEN ? "R" : "",f&fDELETED ? "D" : "",f&fFLAGGED ? "F" : "",
f&fANSWERED ? "A" : "",f&fDRAFT ? "T" : "");
while (uf) /* write user flags */
sprintf(buf+strlen(buf)," %s",stream->user_flags[find_rightmost_bit(&uf)]);
strcat (buf,"\n"); /* tie off flags */
/* copy text, tossing out CRs */
for (i = strlen (buf), ok = T, size = SIZE (message); ok && size; ) {
for (j = 0, c = '\0'; size && (c != '\n') && (j < MAILTMPLEN); size--)
if ((c = SNX (message)) != '\015') tmp[j++] = c;
/* possible "From " line? */
if ((j > 4) && (tmp[0] == 'F') && (tmp[1] == 'r') && (tmp[2] == 'o') &&
(tmp[3] == 'm') && (tmp[4] == ' ')) {
/* see if need to write a widget */
if (!(ti = unix_fromwidget || (c != '\n'))) VALID (tmp,x,ti,zn);
if (ti) ok = unix_append_putc (fd,buf,&i,'>');
}
/* write the line */
for (n = 0; ok && (n < j); n++) ok = unix_append_putc (fd,buf,&i,tmp[n]);
/* handle pathologically long line */
if (ok && (c != '\n') && size) do {
if ((c = SNX (message)) != '\015') ok = unix_append_putc (fd,buf,&i,c);
} while (ok && --size && (c != '\n'));
}
/* write trailing newline */
if (!(ok && (ok = unix_append_putc (fd,buf,&i,'\n') &&
(i ? (write (fd,buf,i) >= 0) : T) && !fsync (fd)))) {
sprintf (buf,"Message append failed: %s",strerror (errno));
mm_log (buf,ERROR);
ftruncate (fd,sbuf.st_size);
}
tp[0] = sbuf.st_atime; /* preserve atime */
tp[1] = time (0); /* set mtime to now */
utime (file,tp); /* set the times */
unix_unlock (fd,NIL,lock); /* unlock and close mailbox */
mm_nocritical (stream); /* release critical */
return ok; /* return success */
}
/* UNIX mail append character
* Accepts: file descriptor
* output buffer
* pointer to current size of output buffer
* character to append
* Returns: T if append successful, else NIL
*/
long unix_append_putc (int fd,char *s,long *i,char c)
{
s[(*i)++] = c;
if (*i == BUFLEN) { /* dump if buffer filled */
if (write (fd,s,*i) < 0) return NIL;
*i = 0; /* reset */
}
return T;
}
/* Internal routines */
/* UNIX mail abort stream
* Accepts: MAIL stream
*/
void unix_abort (MAILSTREAM *stream)
{
if (LOCAL) { /* only if a file is open */
if (LOCAL->fd >= 0) close (LOCAL->fd);
if (LOCAL->ld >= 0) { /* have a mailbox lock? */
flock (LOCAL->ld,LOCK_UN);/* yes, release the lock */
close (LOCAL->ld); /* close the lock file */
unlink (LOCAL->lname); /* and delete it */
}
if (LOCAL->lname) fs_give ((void **) &LOCAL->lname);
/* free local text buffers */
if (LOCAL->buf) fs_give ((void **) &LOCAL->buf);
if (LOCAL->line) fs_give ((void **) &LOCAL->line);
/* nuke the local data */
fs_give ((void **) &stream->local);
stream->dtb = NIL; /* log out the DTB */
}
}
/* UNIX open and lock mailbox
* Accepts: file name to open/lock
* file open mode
* destination buffer for lock file name
* type of locking operation (LOCK_SH or LOCK_EX)
*/
int unix_lock (char *file,int flags,int mode,char *lock,int op)
{
int fd,ld,j;
int i = LOCKTIMEOUT * 60 - 1;
char hitch[MAILTMPLEN],tmp[MAILTMPLEN];
time_t t;
struct stat sb;
sprintf (lock,"%s.lock",file);/* build lock filename */
if (chk_notsymlink (lock)) do{/* until OK or out of tries */
t = time (0); /* get the time now */
#ifdef NFSKLUDGE
/* SUN-OS had an NFS, As kludgy as an albatross;
* And everywhere that it was installed, It was a total loss. -- MRC 9/25/91
*/
/* build hitching post file name */
sprintf (hitch,"%s.%d.%d.",lock,time (0),getpid ());
j = strlen (hitch); /* append local host name */
gethostname (hitch + j,(MAILTMPLEN - j) - 1);
/* try to get hitching-post file */
if ((ld = open (hitch,O_WRONLY|O_CREAT|O_EXCL,
(int) mail_parameters (NIL,GET_LOCKPROTECTION,NIL))) < 0) {
switch (errno) { /* what happened? */
case EEXIST: /* file already exists? */
break; /* oops, just try again */
case EACCES: /* protection failure */
if (stat (hitch,&sb)) { /* try again if file exists(?) */
/* punt silently if paranoid site */
if (mail_parameters (NIL,GET_LOCKEACCESERROR,NIL))
mm_log ("Mailbox vulnerable - directory must have 1777 protection",
WARN);
*lock = '\0'; /* give up on lock file */
}
break;
default: /* some other error */
sprintf (tmp,"Mailbox vulnerable - error creating %.80s: %s",
hitch,strerror (errno));
mm_log (tmp,WARN); /* this is probably not good */
*lock = '\0'; /* give up on lock file */
break;
}
}
else { /* got a hitching-post */
/* make sure others can break the lock */
chmod (hitch,(int) mail_parameters (NIL,GET_LOCKPROTECTION,NIL));
close (ld); /* close the hitching-post */
link (hitch,lock); /* tie hitching-post to lock, ignore failure */
stat (hitch,&sb); /* get its data */
unlink (hitch); /* flush hitching post */
/* If link count .ne. 2, hitch failed. Set ld to -1 as if open() failed
so we try again. If extant lock file and time now is .gt. file time
plus timeout interval, flush the lock so can win next time around. */
if ((ld = (sb.st_nlink != 2) ? -1 : 0) && (!stat (lock,&sb)) &&
(t > sb.st_ctime + LOCKTIMEOUT * 60)) unlink (lock);
}
#else
/* This works on modern Unix systems which are not afflicted with NFS mail.
* "Modern" means that O_EXCL works. I think that NFS mail is a terrible
* idea -- that's what IMAP is for -- but some people insist upon losing...
*/
/* try to get the lock */
if ((ld = open (lock,O_WRONLY|O_CREAT|O_EXCL,
(int) mail_parameters (NIL,GET_LOCKPROTECTION,NIL))) < 0)
switch (errno) { /* what happened? */
case EEXIST: /* if extant and old, grab it for ourselves */
if ((!stat (lock,&sb)) && (t > sb.st_ctime + LOCKTIMEOUT * 60))
ld = open (lock,O_WRONLY|O_CREAT,
(int) mail_parameters (NIL,GET_LOCKPROTECTION,NIL));
break;
case EACCES: /* protection fail, ignore if non-ex or old */
if (stat (lock,&sb)) { /* try again if file exists(?) */
/* punt silently if paranoid site */
if (mail_parameters (NIL,GET_LOCKEACCESERROR,NIL))
mm_log ("Mailbox vulnerable - directory must have 1777 protection",
WARN);
*lock = '\0'; /* give up on lock file */
}
else if (t > sb.st_ctime + LOCKTIMEOUT * 60) unlink (lock);
break;
default: /* some other failure */
sprintf (tmp,"Mailbox vulnerable - error creating %.80s: %s",
lock,strerror (errno));
mm_log (tmp,WARN); /* this is probably not good */
*lock = '\0'; /* don't use lock files */
break;
}
if (ld >= 0) { /* if made a lock file */
/* make sure others can break the lock */
chmod (lock,(int) mail_parameters (NIL,GET_LOCKPROTECTION,NIL));
close (ld); /* close the lock file */
}
#endif
if ((ld < 0) && *lock) { /* if failed to make lock file and retry OK */
if (!(i%15)) {
sprintf (tmp,"Mailbox %.80s is locked, will override in %d seconds...",
file,i);
mm_log (tmp,WARN);
}
sleep (1); /* wait 1 second before next try */
}
} while (i-- && ld < 0 && *lock);
/* open file */
if ((fd = open (file,flags,mode)) >= 0) flock (fd,op);
else { /* open failed */
j = errno; /* preserve error code */
if (*lock) unlink (lock); /* flush the lock file if any */
errno = j; /* restore error code */
}
return fd;
}
/* UNIX unlock and close mailbox
* Accepts: file descriptor
* (optional) mailbox stream to check atime/mtime
* (optional) lock file name
*/
void unix_unlock (int fd,MAILSTREAM *stream,char *lock)
{
struct stat sbuf;
time_t tp[2];
fstat (fd,&sbuf); /* get file times */
/* if stream and csh would think new mail */
if (stream && (sbuf.st_atime <= sbuf.st_mtime)) {
tp[0] = time (0); /* set atime to now */
/* set mtime to (now - 1) if necessary */
tp[1] = tp[0] > sbuf.st_mtime ? sbuf.st_mtime : tp[0] - 1;
/* set the times, note change */
if (!utime (stream->mailbox,tp)) LOCAL->filetime = tp[1];
}
flock (fd,LOCK_UN); /* release flock'ers */
if (!stream) close (fd); /* close the file if no stream */
/* flush the lock file if any */
if (lock && *lock) unlink (lock);
}
/* UNIX mail parse and lock mailbox
* Accepts: MAIL stream
* space to write lock file name
* type of locking operation
* Returns: T if parse OK, critical & mailbox is locked shared; NIL if failure
*/
int unix_parse (MAILSTREAM *stream,char *lock,int op)
{
int zn;
unsigned long i,j,k;
char c,*s,*t,*u,tmp[MAILTMPLEN],date[30];
int ti = 0,pseudoseen = NIL;
unsigned long nmsgs = stream->nmsgs;
unsigned long prevuid = nmsgs ? mail_elt (stream,nmsgs)->private.uid : 0;
unsigned long recent = stream->recent;
unsigned long oldnmsgs = stream->nmsgs;
short silent = stream->silent;
struct stat sbuf;
STRING bs;
FDDATA d;
MESSAGECACHE *elt;
mailcache_t mc = (mailcache_t) mail_parameters (NIL,GET_CACHE,NIL);
mail_lock (stream); /* guard against recursion or pingers */
/* toss out previous descriptor */
if (LOCAL->fd >= 0) close (LOCAL->fd);
mm_critical (stream); /* open and lock mailbox (shared OK) */
if ((LOCAL->fd = unix_lock (stream->mailbox,(LOCAL->ld >= 0) ?
O_RDWR : O_RDONLY,NIL,lock,op)) < 0) {
sprintf (tmp,"Mailbox open failed, aborted: %s",strerror (errno));
mm_log (tmp,ERROR);
unix_abort (stream);
mail_unlock (stream);
mm_nocritical (stream); /* done with critical */
return NIL;
}
fstat (LOCAL->fd,&sbuf); /* get status */
/* validate change in size */
if (sbuf.st_size < LOCAL->filesize) {
sprintf (tmp,"Mailbox shrank from %lu to %lu bytes, aborted",
LOCAL->filesize,sbuf.st_size);
mm_log (tmp,ERROR); /* this is pretty bad */
unix_unlock (LOCAL->fd,stream,lock);
unix_abort (stream);
mail_unlock (stream);
mm_nocritical (stream); /* done with critical */
return NIL;
}
/* new data? */
else if (i = sbuf.st_size - LOCAL->filesize) {
d.fd = LOCAL->fd; /* yes, set up file descriptor */
d.pos = LOCAL->filesize; /* get to that position in the file */
d.chunk = LOCAL->buf; /* initial buffer chunk */
d.chunksize = CHUNK; /* file chunk size */
INIT (&bs,fd_string,&d,i); /* initialize stringstruct */
/* skip leading whitespace for broken MTAs */
while (((c = CHR (&bs)) == '\n') || (c == ' ') || (c == '\t')) SNX (&bs);
if (SIZE (&bs)) { /* read new data */
/* remember internal header position */
j = LOCAL->filesize + GETPOS (&bs);
s = unix_mbxline (stream,&bs,&i);
if (i) VALID (s,t,ti,zn); /* see if valid From line */
if (!ti) { /* someone pulled the rug from under us */
sprintf(tmp,"Unexpected changes to mailbox (try restarting): %.20s",s);
mm_log (tmp,ERROR);
unix_unlock (LOCAL->fd,stream,lock);
unix_abort (stream);
mail_unlock (stream);
mm_nocritical (stream); /* done with critical */
return NIL;
}
stream->silent = T; /* quell main program new message events */
do { /* found a message */
/* instantiate first new message */
mail_exists (stream,++nmsgs);
(elt = mail_elt (stream,nmsgs))->valid = T;
recent++; /* assume recent by default */
elt->recent = T;
/* note position/size of internal header */
elt->private.special.offset = j;
elt->private.msg.header.offset = elt->private.special.text.size = i;
/* generate plausible IMAPish date string */
date[2] = date[6] = date[20] = '-'; date[11] = ' ';
date[14] = date[17] = ':';
/* dd */
date[0] = t[ti - 2]; date[1] = t[ti - 1];
/* mmm */
date[3] = t[ti - 6]; date[4] = t[ti - 5]; date[5] = t[ti - 4];
/* hh */
date[12] = t[ti + 1]; date[13] = t[ti + 2];
/* mm */
date[15] = t[ti + 4]; date[16] = t[ti + 5];
if (t[ti += 6] == ':') {/* ss */
date[18] = t[++ti]; date[19] = t[++ti];
ti++; /* move to space */
}
else date[18] = date[19] = '0';
/* yy -- advance over timezone if necessary */
if (zn == ti) ti += (((t[zn+1] == '+') || (t[zn+1] == '-')) ? 6 : 4);
date[7] = t[ti + 1]; date[8] = t[ti + 2];
date[9] = t[ti + 3]; date[10] = t[ti + 4];
/* zzz */
t = zn ? (t + zn + 1) : "LCL";
date[21] = *t++; date[22] = *t++; date[23] = *t++;
if ((date[21] != '+') && (date[21] != '-')) date[24] = '\0';
else { /* numeric time zone */
date[24] = *t++; date[25] = *t++;
date[26] = '\0'; date[20] = ' ';
}
/* set internal date */
if (!mail_parse_date (elt,date)) {
sprintf (tmp,"Unable to parse internal date: %s",date);
mm_log (tmp,WARN);
}
do { /* look for message body */
s = t = unix_mbxline (stream,&bs,&i);
if (i) switch (*s) { /* check header lines */
case 'X': /* possible X-???: line */
if (s[1] == '-') { /* must be immediately followed by hyphen */
/* X-Status: becomes Status: in S case */
if (s[2] == 'S' && s[3] == 't' && s[4] == 'a' && s[5] == 't' &&
s[6] == 'u' && s[7] == 's' && s[8] == ':') s += 2;
/* possible X-Keywords */
else if (s[2] == 'K' && s[3] == 'e' && s[4] == 'y' &&
s[5] == 'w' && s[6] == 'o' && s[7] == 'r' &&
s[8] == 'd' && s[9] == 's' && s[10] == ':') {
char uf[MAILTMPLEN];
s += 11; /* flush leading whitespace */
while (*s && (*s != '\n')) {
while (*s == ' ') s++;
/* find end of keyword */
if (!(u = strpbrk (s," \n"))) u = s + strlen (s);
/* got a keyword? */
if ((k = (u - s)) && (k < MAILTMPLEN)) {
/* copy keyword */
strncpy (uf,s,k);
uf[k] = '\0'; /* make sure tied off */
ucase (uf); /* coerce upper case */
for (j = 0; (j<NUSERFLAGS) && stream->user_flags[j]; ++j)
if (!strcmp(uf,
ucase (strcpy(tmp,stream->user_flags[j])))) {
elt->user_flags |= ((long) 1) << j;
break;
}
/* need to create it? */
if (!stream->rdonly && (j < NUSERFLAGS) &&
!stream->user_flags[j]) {
/* set the bit */
*uf |= 1 << j;
stream->user_flags[j] = (char *) fs_get (k + 1);
strncpy (stream->user_flags[j],s,k);
stream->user_flags[j][k] = '\0';
/* if now out of user flags */
if (j == NUSERFLAGS - 1) stream->kwd_create = NIL;
}
}
s = u; /* advance to next keyword */
}
break;
}
/* possible X-IMAP */
else if (s[2] == 'I' && s[3] == 'M' && s[4] == 'A' &&
s[5] == 'P' && s[6] == ':') {
if ((nmsgs == 1) && !stream->uid_validity) {
s += 7; /* advance to data */
/* flush whitespace */
while (*s == ' ') s++;
j = 0; /* slurp UID validity */
/* found a digit? */
while (isdigit (*s)) {
j *= 10; /* yes, add it in */
j += *s++ - '0';
}
if (!j) break; /* punt if invalid UID validity */
stream->uid_validity = j;
/* flush whitespace */
while (*s == ' ') s++;
/* must have UID last too */
if (isdigit (*s)) {
j = 0; /* slurp UID last */
while (isdigit (*s)) {
j *= 10; /* yes, add it in */
j += *s++ - '0';
}
stream->uid_last = j;
/* process keywords */
for (j = 0; *s != '\n'; j++) {
/* flush leading whitespace */
while (*s == ' ') s++;
u = strpbrk (s," \n");
/* got a keyword? */
if ((k = (u - s)) && j < NUSERFLAGS) {
if (stream->user_flags[j])
fs_give ((void **) &stream->user_flags[j]);
stream->user_flags[j] = (char *) fs_get (k + 1);
strncpy (stream->user_flags[j],s,k);
stream->user_flags[j][k] = '\0';
}
s = u; /* advance to next keyword */
}
/* pseudo-header seen */
pseudoseen = T;
}
}
break;
}
/* possible X-UID */
else if (s[2] == 'U' && s[3] == 'I' && s[4] == 'D' &&
s[5] == ':') {
/* only believe if have a UID validity */
if (stream->uid_validity && (nmsgs > 1)) {
s += 6; /* advance to UID value */
/* flush whitespace */
while (*s == ' ') s++;
j = 0;
/* found a digit? */
while (isdigit (*s)) {
j *= 10; /* yes, add it in */
j += *s++ - '0';
}
/* flush remainder of line */
while (*s != '\n') s++;
/* make sure not duplicated */
if (elt->private.uid)
sprintf (tmp,"Message %lu UID %lu already has UID %lu",
pseudoseen ? elt->msgno - 1 : elt->msgno,
j,elt->private.uid);
/* make sure UID doesn't go backwards */
else if (j <= prevuid)
sprintf (tmp,"Message %lu UID %lu less than %lu",
pseudoseen ? elt->msgno - 1 : elt->msgno,
j,prevuid + 1);
/* or skip by mailbox's recorded last */
else if (j > stream->uid_last)
sprintf (tmp,"Message %lu UID %lu greater than last %lu",
pseudoseen ? elt->msgno - 1 : elt->msgno,
j,stream->uid_last);
else { /* normal UID case */
prevuid = elt->private.uid = j;
break; /* exit this cruft */
}
mm_log (tmp,WARN);
/* invalidate UID validity */
stream->uid_validity = 0;
elt->private.uid = 0;
}
break;
}
}
/* otherwise fall into S case */
case 'S': /* possible Status: line */
if (s[0] == 'S' && s[1] == 't' && s[2] == 'a' && s[3] == 't' &&
s[4] == 'u' && s[5] == 's' && s[6] == ':') {
s += 6; /* advance to status flags */
do switch (*s++) {/* parse flags */
case 'R': /* message read */
elt->seen = T;
break;
case 'O': /* message old */
if (elt->recent) {
elt->recent = NIL;
recent--; /* it really wasn't recent */
}
break;
case 'D': /* message deleted */
elt->deleted = T;
break;
case 'F': /* message flagged */
elt->flagged = T;
break;
case 'A': /* message answered */
elt->answered = T;
break;
case 'T': /* message is a draft */
elt->draft = T;
break;
default: /* some other crap */
break;
} while (*s && *s != '\n');
break; /* all done */
}
/* otherwise fall into default case */
default: /* ordinary header line */
elt->rfc822_size += i + 1;
break;
}
} while (i && (*t != '\n'));
/* assign a UID if none found */
if (((nmsgs > 1) || !pseudoseen) && !elt->private.uid)
prevuid = elt->private.uid = ++stream->uid_last;
/* note size of header, location of text */
elt->private.msg.header.text.size =
(elt->private.msg.text.offset =
(LOCAL->filesize + GETPOS (&bs)) - elt->private.special.offset) -
elt->private.special.text.size;
k = 0; /* no previous line size yet */
/* note current position */
j = LOCAL->filesize + GETPOS (&bs);
if (i) do { /* look for next message */
s = unix_mbxline (stream,&bs,&i);
if (i) { /* got new data? */
VALID (s,t,ti,zn); /* yes, parse line */
if (!ti) { /* not a header line, add it to message */
elt->rfc822_size +=
k = i + (((i > 1) && s[i - 2] == '\015') ? 0 : 1);
/* update current position */
j = LOCAL->filesize + GETPOS (&bs);
}
}
} while (i && !ti); /* until found a header */
elt->private.msg.text.text.size = j -
(elt->private.special.offset + elt->private.msg.text.offset);
if (k == 2) { /* last line was blank? */
elt->private.msg.text.text.size--;
elt->rfc822_size -= 2;
}
} while (i); /* until end of buffer */
if (pseudoseen) { /* flush pseudo-message if present */
/* decrement recent count */
if (mail_elt (stream,1)->recent) recent--;
/* and the exists count */
mail_exists (stream,nmsgs--);
mail_expunged(stream,1);/* fake an expunge of that message */
}
/* need to start a new UID validity? */
if (!stream->uid_validity) {
stream->uid_validity = time (0);
/* in case a whiner with no life */
if (mail_parameters (NIL,GET_USERHASNOLIFE,NIL))
stream->uid_nosticky = T;
else LOCAL->dirty = T; /* make dirty to create pseudo-message */
}
stream->nmsgs = oldnmsgs; /* whack it back down */
stream->silent = silent; /* restore old silent setting */
/* notify upper level of new mailbox sizes */
mail_exists (stream,nmsgs);
mail_recent (stream,recent);
/* mark dirty so O flags are set */
if (recent) LOCAL->dirty = T;
}
}
/* no change, don't babble if never got time */
else if (LOCAL->filetime && LOCAL->filetime != sbuf.st_mtime)
mm_log ("New mailbox modification time but apparently no changes",WARN);
/* update parsed file size and time */
LOCAL->filesize = sbuf.st_size;
LOCAL->filetime = sbuf.st_mtime;
return T; /* return the winnage */
}
/* UNIX read line from mailbox
* Accepts: mail stream
* stringstruct
* pointer to line size
* Returns: pointer to input line
*/
char *unix_mbxline (MAILSTREAM *stream,STRING *bs,unsigned long *size)
{
unsigned long i,j,k,m;
char p1[CHUNK];
char *ret = "";
/* flush old buffer */
if (LOCAL->line) fs_give ((void **) &LOCAL->line);
/* if buffer needs refreshing */
if (!bs->cursize) SETPOS (bs,GETPOS (bs));
if (SIZE (bs)) { /* find newline */
for (i = 0; (i < bs->cursize) && (bs->curpos[i] != '\n'); i++);
if (i == bs->cursize) { /* difficult case if line spans buffer */
memcpy (p1,bs->curpos,i); /* remember what we have so far */
/* load next buffer */
SETPOS (bs,k = GETPOS (bs) + i);
for (j = 0; (j < bs->cursize) && (bs->curpos[j] != '\n'); j++);
if (j == bs->cursize) { /* huge line? */
SETPOS (bs,GETPOS (bs) + j);
/* look for end of line */
for (m = SIZE (bs); m && (SNX (bs) != '\n'); --m,++j);
SETPOS (bs,k); /* go back to where it started */
}
ret = LOCAL->line = (char *) fs_get (i + j + 2);
memcpy (ret,p1,i); /* copy first chunk */
while (j) { /* copy remainder */
if (!bs->cursize) SETPOS (bs,GETPOS (bs));
memcpy (ret + i,bs->curpos,k = min (j,bs->cursize));
i += k; /* account for this much read in */
j -= k;
bs->curpos += k; /* increment new position */
bs->cursize -= k; /* eat that many bytes */
}
if (SIZE (bs)) SNX (bs); /* skip over newline if one seen */
ret[i++] = '\n'; /* make sure newline at end */
ret[i] = '\0'; /* makes debugging easier */
}
else { /* this is easy */
ret = bs->curpos; /* string it at this position */
bs->curpos += ++i; /* increment new position */
bs->cursize -= i; /* eat that many bytes */
}
*size = i; /* return that to user */
}
else *size = 0; /* end of data, return empty */
return ret;
}
/* UNIX make pseudo-header
* Accepts: MAIL stream
* buffer to write pseudo-header
* Returns: length of pseudo-header
*/
unsigned long unix_pseudo (MAILSTREAM *stream,char *hdr)
{
int i;
char *s;
time_t t = time(0);
sprintf (hdr,"From %s %sDate: ",pseudo_from,ctime (&t));
rfc822_date (s = hdr + strlen (hdr));
sprintf (s += strlen (s), /* write the pseudo-header */
"\nFrom: %s <%s@%s>\nSubject: %s\nX-IMAP: %010lu %010lu",
pseudo_name,pseudo_from,mylocalhost (),pseudo_subject,
stream->uid_validity,stream->uid_last);
for (i = 0; i < NUSERFLAGS; ++i) if (stream->user_flags[i])
sprintf (s += strlen (s)," %s",stream->user_flags[i]);
sprintf (s += strlen (s),"\nStatus: RO\n\n%s\n\n",pseudo_msg);
return strlen (hdr);
}
/* UNIX make status string
* Accepts: MAIL stream
* destination string to write
* message cache entry
* non-zero flag to write UID as well
* Returns: length of string
*/
unsigned long unix_xstatus (MAILSTREAM *stream,char *status,MESSAGECACHE *elt,
long flag)
{
char *t;
char *s = status;
unsigned long uf = elt->user_flags;
/* This used to be an sprintf(), but thanks to certain cretinous C libraries
with horribly slow implementations of sprintf() I had to change it to this
mess. At least it should be fast. */
*s++ = 'S'; *s++ = 't'; *s++ = 'a'; *s++ = 't'; *s++ = 'u'; *s++ = 's';
*s++ = ':'; *s++ = ' ';
if (elt->seen) *s++ = 'R';
*s++ = 'O'; *s++ = '\n';
*s++ = 'X'; *s++ = '-'; *s++ = 'S'; *s++ = 't'; *s++ = 'a'; *s++ = 't';
*s++ = 'u'; *s++ = 's'; *s++ = ':'; *s++ = ' ';
if (elt->deleted) *s++ = 'D';
if (elt->flagged) *s++ = 'F';
if (elt->answered) *s++ = 'A';
if (elt->draft) *s++ = 'T';
*s++ = '\n';
if (!stream->uid_nosticky) { /* cretins with no life can't use this */
*s++ = 'X'; *s++ = '-'; *s++ = 'K'; *s++ = 'e'; *s++ = 'y'; *s++ = 'w';
*s++ = 'o'; *s++ = 'r'; *s++ = 'd'; *s++ = 's'; *s++ = ':';
while (uf) {
*s++ = ' ';
for (t = stream->user_flags[find_rightmost_bit (&uf)]; *t; *s++ = *t++);
}
*s++ = '\n';
if (flag) { /* want to include UID? */
char stack[64];
char *p = stack;
/* push UID digits on the stack */
unsigned long n = elt->private.uid;
do *p++ = (char) (n % 10) + '0';
while (n /= 10);
*s++ = 'X'; *s++ = '-'; *s++ = 'U'; *s++ = 'I'; *s++ = 'D'; *s++ = ':';
*s++ = ' ';
/* pop UID from stack */
while (p > stack) *s++ = *--p;
*s++ = '\n';
}
}
*s++ = '\n'; *s = '\0'; /* end of extended message status */
return s - status; /* return size of resulting string */
}
/* Rewrite mailbox file
* Accepts: MAIL stream, must be critical and locked
* return pointer to number of expunged messages if want expunge
* Returns: T if success and mailbox unlocked, NIL if failure
*/
long unix_rewrite (MAILSTREAM *stream,unsigned long *nexp)
{
unsigned long i,j;
int e,retry;
time_t tp[2];
struct stat sbuf;
FILE *f;
MESSAGECACHE *elt;
unsigned long recent = stream->recent;
unsigned long size = 0; /* initially nothing done */
if (nexp) *nexp = 0; /* initially nothing expunged */
/* open scratch file */
if (!(f = tmpfile ())) return unix_punt_scratch (NIL);
if (!(stream->uid_nosticky || /* write pseudo-header */
unix_fwrite (f,LOCAL->buf,unix_pseudo (stream,LOCAL->buf),&size)))
return unix_punt_scratch (f);
if (nexp) { /* expunging */
for (i = 1; i <= stream->nmsgs; i++)
if (!(elt = mail_elt (stream,i))->deleted &&
!unix_write_message (f,stream,elt,&size))
return unix_punt_scratch (f);
}
else for (i = 1; i <= stream->nmsgs; i++)
if (!unix_write_message (f,stream,mail_elt (stream,i),&size))
return unix_punt_scratch (f);
/* write remaining data */
if (fflush (f) || fstat (fileno (f),&sbuf)) return unix_punt_scratch (f);
if (size != sbuf.st_size) { /* make damn sure stdio isn't lying */
char tmp[MAILTMPLEN];
sprintf (tmp,"Checkpoint file size mismatch (%lu != %lu)",size,
sbuf.st_size);
mm_log (tmp,ERROR);
fclose (f); /* flush the output file */
return NIL;
}
if (size > LOCAL->filesize) { /* does the mailbox need to grow? */
/* am I paranoid or what? */
if ((i = size - LOCAL->filesize) > LOCAL->buflen) {
/* this user won the lottery all right */
fs_give ((void **) &LOCAL->buf);
LOCAL->buf = (char *) fs_get ((LOCAL->buflen = i) + 1);
}
memset (LOCAL->buf,'\0',i); /* get a block of nulls */
while (i) { /* until write successful or punt */
lseek (LOCAL->fd,LOCAL->filesize,L_SET);
if (write (LOCAL->fd,LOCAL->buf,i) < 0) {
j = errno; /* note error before doing ftrunctate */
ftruncate (LOCAL->fd,LOCAL->filesize);
fsync (LOCAL->fd);
if (mm_diskerror (stream,j,NIL)) {
sprintf (LOCAL->buf,"Unable to extend mailbox: %s",strerror (j));
mm_log (LOCAL->buf,ERROR);
fclose (f); /* flush the output file */
return NIL;
}
}
else i = 0; /* write was successful */
}
}
/* update the cache */
for (i = 1; i <= stream->nmsgs;) {
elt = mail_elt (stream,i); /* get cache */
if (nexp && elt->deleted) { /* expunge this message? */
if (elt->recent) recent--;/* one less recent message */
mail_expunged (stream,i); /* notify upper levels */
++*nexp; /* count up one more expunged message */
}
else { /* update file pointers from kludgey places */
elt->private.special.offset = elt->private.msg.full.offset;
elt->private.msg.text.offset = elt->private.msg.full.text.size;
/* in case header grew */
elt->private.msg.header.text.size = elt->private.msg.text.offset -
elt->private.msg.header.offset;
/* stomp on these two kludges */
elt->private.msg.full.offset = elt->private.msg.full.text.size = 0;
i++; /* preserved message */
}
}
do { /* restart point if failure */
retry = NIL; /* no need to retry yet */
fseek (f,0,L_SET); /* rewind files */
lseek (LOCAL->fd,0,L_SET);
for (i = size; i; i -= j)
if (!((j = fread (LOCAL->buf,1,min ((long) CHUNK,i),f)) &&
(write (LOCAL->fd,LOCAL->buf,j) >= 0))) {
sprintf (LOCAL->buf,"Mailbox rewrite error: %s",strerror (e = errno));
mm_notify (stream,LOCAL->buf,WARN);
mm_diskerror (stream,e,T);
retry = T; /* must retry */
break;
}
} while (retry); /* in case need to retry */
fclose (f); /* finished with scratch file */
/* make sure tied off */
ftruncate (LOCAL->fd,LOCAL->filesize = size);
fsync (LOCAL->fd); /* make sure the updates take */
LOCAL->dirty = NIL; /* no longer dirty */
/* notify upper level of new mailbox sizes */
mail_exists (stream,stream->nmsgs);
mail_recent (stream,recent);
/* set atime to now, mtime a second earlier */
tp[1] = (tp[0] = time (0)) - 1;
/* set the times, note change */
if (!utime (stream->mailbox,tp)) LOCAL->filetime = tp[1];
close (LOCAL->fd); /* close and reopen file */
if ((LOCAL->fd = open (stream->mailbox,O_RDWR,NIL)) < 0) {
sprintf (LOCAL->buf,"Mailbox open failed, aborted: %s",strerror (errno));
mm_log (LOCAL->buf,ERROR);
unix_abort (stream);
}
return T; /* looks good */
}
/* Write message
* Accepts: destination file
* MAIL stream
* message number
* pointer to current filesize tally
* Returns: T if success, NIL if failure
*/
long unix_write_message (FILE *f,MAILSTREAM *stream,MESSAGECACHE *elt,
unsigned long *size)
{
char *s;
unsigned long i;
/* (kludge alert) note new message offset */
elt->private.msg.full.offset = *size;
/* internal header */
lseek (LOCAL->fd,elt->private.special.offset,L_SET);
read (LOCAL->fd,LOCAL->buf,elt->private.special.text.size);
if (unix_fwrite (f,LOCAL->buf,elt->private.special.text.size,size)) {
/* get header */
s = unix_header (stream,elt->msgno,&i,FT_INTERNAL);
/* header size, sans trailing newline */
if (i && (s[i - 2] == '\n')) i--;
/* write header */
if (unix_fwrite (f,s,i,size) &&
unix_fwrite (f,LOCAL->buf,unix_xstatus(stream,LOCAL->buf,elt,T),size)){
/* (kludge alert) note new text offset */
elt->private.msg.full.text.size = *size - elt->private.msg.full.offset;
/* get text */
s = unix_text_work (stream,elt,&i,FT_INTERNAL);
/* write text and trailing newline */
if (unix_fwrite (f,s,i,size) && unix_fwrite (f,"\n",1,size)) return T;
}
}
return NIL; /* failed */
}
/* Safely write buffer
* Accepts: destination file
* buffer pointer
* number of octets
* pointer to current filesize tally
* Returns: T if successful, NIL if failure
*/
long unix_fwrite (FILE *f,char *s,unsigned long i,unsigned long *size)
{
unsigned long j;
while (i && ((j = fwrite (s,1,i,f)) || (errno == EINTR))) {
*size += j;
s += j;
i -= j;
}
return i ? NIL : T; /* success if wrote all requested data */
}
/* Punt scratch file
* Accepts: file pointer
* Returns: NIL, always
*/
long unix_punt_scratch (FILE *f)
{
char tmp[MAILTMPLEN];
sprintf (tmp,"Checkpoint file failure: %s",strerror (errno));
mm_log (tmp,ERROR);
if (f) fclose (f); /* flush the output file */
return NIL;
}