mtxnt.c

mgcp协议源代码。支持多种编码：g711

/*
 * Program:	MTX mail routines
 *
 * Author:	Mark Crispin
 *		Networks and Distributed Computing
 *		Computing & Communications
 *		University of Washington
 *		Administration Building, AG-44
 *		Seattle, WA  98195
 *		Internet: [e-mail]
 *
 * Date:	22 May 1990
 * Last Edited:	18 October 2000
 *
 * Copyright 2000 by the University of Washington
 *
 *  Permission to use, copy, modify, and distribute this software and its
 * documentation for any purpose and without fee is hereby granted, provided
 * that the above copyright notice appears in all copies and that both the
 * above copyright notice and this permission notice appear in supporting
 * documentation, and that the name of the University of Washington not be
 * used in advertising or publicity pertaining to distribution of the software
 * without specific, written prior permission.  This software is made
 * available "as is", and
 * THE UNIVERSITY OF WASHINGTON DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED,
 * WITH REGARD TO THIS SOFTWARE, INCLUDING WITHOUT LIMITATION ALL IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, AND IN
 * NO EVENT SHALL THE UNIVERSITY OF WASHINGTON BE LIABLE FOR ANY SPECIAL,
 * INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
 * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, TORT
 * (INCLUDING NEGLIGENCE) OR STRICT LIABILITY, ARISING OUT OF OR IN CONNECTION
 * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 *
 */


#include <stdio.h>
#include <ctype.h>
#include <errno.h>
extern int errno;		/* just in case */
#include "mail.h"
#include "osdep.h"
#include <fcntl.h>
#include <time.h>
#include <sys/stat.h>
#include <sys/utime.h>
#include "mtxnt.h"
#include "misc.h"
#include "dummy.h"

/* MTX mail routines */


/* Driver dispatch used by MAIL */

DRIVER mtxdriver = {
  "mtx",			/* driver name */
				/* driver flags */
  DR_LOCAL|DR_MAIL|DR_CRLF|DR_NOSTICKY,
  (DRIVER *) NIL,		/* next driver */
  mtx_valid,			/* mailbox is valid for us */
  mtx_parameters,		/* manipulate parameters */
  mtx_scan,			/* scan mailboxes */
  mtx_list,			/* list mailboxes */
  mtx_lsub,			/* list subscribed mailboxes */
  NIL,				/* subscribe to mailbox */
  NIL,				/* unsubscribe from mailbox */
  mtx_create,			/* create mailbox */
  mtx_delete,			/* delete mailbox */
  mtx_rename,			/* rename mailbox */
  NIL,				/* status of mailbox */
  mtx_open,			/* open mailbox */
  mtx_close,			/* close mailbox */
  mtx_flags,			/* fetch message "fast" attributes */
  mtx_flags,			/* fetch message flags */
  NIL,				/* fetch overview */
  NIL,				/* fetch message envelopes */
  mtx_header,			/* fetch message header */
  mtx_text,			/* fetch message body */
  NIL,				/* fetch partial message text */
  NIL,				/* unique identifier */
  NIL,				/* message number */
  mtx_flag,			/* modify flags */
  mtx_flagmsg,			/* per-message modify flags */
  NIL,				/* search for message based on criteria */
  NIL,				/* sort messages */
  NIL,				/* thread messages */
  mtx_ping,			/* ping mailbox to see if still alive */
  mtx_check,			/* check for new messages */
  mtx_expunge,			/* expunge deleted messages */
  mtx_copy,			/* copy messages to another mailbox */
  mtx_append,			/* append string message to mailbox */
  NIL				/* garbage collect stream */
};

				/* prototype stream */
MAILSTREAM mtxproto = {&mtxdriver};

/* MTX mail validate mailbox
 * Accepts: mailbox name
 * Returns: our driver if name is valid, NIL otherwise
 */

DRIVER *mtx_valid (char *name)
{
  char tmp[MAILTMPLEN];
  return mtx_isvalid (name,tmp) ? &mtxdriver : NIL;
}


/* MTX mail test for valid mailbox
 * Accepts: mailbox name
 * Returns: T if valid, NIL otherwise
 */

int mtx_isvalid (char *name,char *tmp)
{
  int fd;
  int ret = NIL;
  char *s,file[MAILTMPLEN];
  struct stat sbuf;
  struct utimbuf times;
  errno = EINVAL;		/* assume invalid argument */
				/* if file, get its status */
  if ((s = mailboxfile (file,name)) && !stat (s,&sbuf) &&
      ((sbuf.st_mode & S_IFMT) == S_IFREG)) {
    if (!sbuf.st_size)errno = 0;/* empty file */
    else if ((fd = open (file,O_BINARY|O_RDONLY,NIL)) >= 0) {
      memset (tmp,'\0',MAILTMPLEN);
      if ((read (fd,tmp,64) >= 0) && (s = strchr (tmp,'\015')) &&
	  (s[1] == '\012')) {	/* valid format? */
	*s = '\0';		/* tie off header */
				/* must begin with dd-mmm-yy" */
	ret = (((tmp[2] == '-' && tmp[6] == '-') ||
		(tmp[1] == '-' && tmp[5] == '-')) &&
	       (s = strchr (tmp+20,',')) && strchr (s+2,';')) ? T : NIL;
      }
      else errno = -1;		/* bogus format */
      close (fd);		/* close the file */
				/* preserve atime and mtime */
      times.actime = sbuf.st_atime;
      times.modtime = sbuf.st_mtime;
      utime (file,&times);	/* set the times */
    }
  }
				/* in case INBOX but not mtx format */
  else if ((errno == ENOENT) && ((name[0] == 'I') || (name[0] == 'i')) &&
	   ((name[1] == 'N') || (name[1] == 'n')) &&
	   ((name[2] == 'B') || (name[2] == 'b')) &&
	   ((name[3] == 'O') || (name[3] == 'o')) &&
	   ((name[4] == 'X') || (name[4] == 'x')) && !name[5]) errno = -1;
  return ret;			/* return what we should */
}


/* MTX manipulate driver parameters
 * Accepts: function code
 *	    function-dependent value
 * Returns: function-dependent return value
 */

void *mtx_parameters (long function,void *value)
{
  return NIL;
}

/* MTX mail scan mailboxes
 * Accepts: mail stream
 *	    reference
 *	    pattern to search
 *	    string to scan
 */

void mtx_scan (MAILSTREAM *stream,char *ref,char *pat,char *contents)
{
  if (stream) dummy_scan (NIL,ref,pat,contents);
}


/* MTX mail list mailboxes
 * Accepts: mail stream
 *	    reference
 *	    pattern to search
 */

void mtx_list (MAILSTREAM *stream,char *ref,char *pat)
{
  if (stream) dummy_list (NIL,ref,pat);
}


/* MTX mail list subscribed mailboxes
 * Accepts: mail stream
 *	    reference
 *	    pattern to search
 */

void mtx_lsub (MAILSTREAM *stream,char *ref,char *pat)
{
  if (stream) dummy_lsub (NIL,ref,pat);
}

/* MTX mail create mailbox
 * Accepts: MAIL stream
 *	    mailbox name to create
 * Returns: T on success, NIL on failure
 */

long mtx_create (MAILSTREAM *stream,char *mailbox)
{
  return dummy_create (stream,mailbox);
}


/* MTX mail delete mailbox
 * Accepts: MAIL stream
 *	    mailbox name to delete
 * Returns: T on success, NIL on failure
 */

long mtx_delete (MAILSTREAM *stream,char *mailbox)
{
  return mtx_rename (stream,mailbox,NIL);
}

/* MTX mail rename mailbox
 * Accepts: MAIL stream
 *	    old mailbox name
 *	    new mailbox name (or NIL for delete)
 * Returns: T on success, NIL on failure
 */

long mtx_rename (MAILSTREAM *stream,char *old,char *newname)
{
  long ret = T;
  char c,*s,tmp[MAILTMPLEN],file[MAILTMPLEN],lock[MAILTMPLEN];
  int ld;
  int fd = open (mailboxfile (file,old),O_BINARY|O_RDWR,NIL);
  struct stat sbuf;
  if (fd < 0) {			/* open mailbox */
    sprintf (tmp,"Can't open mailbox %.80s: %s",old,strerror (errno));
    mm_log (tmp,ERROR);
    return NIL;
  }
				/* get exclusive parse/append permission */
  if ((ld = lockname (lock,old,LOCK_EX)) < 0) {
    mm_log ("Unable to lock rename mailbox",ERROR);
    return NIL;
  }
				/* lock out other users */
  if (flock (fd,LOCK_EX|LOCK_NB)) {
    close (fd);			/* couldn't lock, give up on it then */
    sprintf (tmp,"Mailbox %.80s is in use by another process",old);
    mm_log (tmp,ERROR);
    unlockfd (ld,lock);		/* release exclusive parse/append permission */
    return NIL;
  }
  if (newname) {		/* want rename? */
    if (!((s = mailboxfile (tmp,newname)) && *s) ||
	((s = strrchr (s,'\\')) && !s[1])) {
      sprintf (tmp,"Can't rename mailbox %.80s to %.80s: invalid name",
	       old,newname);
      mm_log (tmp,ERROR);
      ret = NIL;		/* set failure */
    }
				/* found superior to destination name? */
    if (s && (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");
  if (stream->rdonly ||
      (fd = open (mailboxfile (tmp,stream->mailbox),O_BINARY|O_RDWR,NIL)) < 0){
    if ((fd=open(mailboxfile(tmp,stream->mailbox),O_BINARY|O_RDONLY,NIL)) < 0){
      sprintf (tmp,"Can't open mailbox: %.80s",strerror (errno));
      mm_log (tmp,ERROR);
      return NIL;
    }
    else if (!stream->rdonly) {	/* got it, but readonly */
      mm_log ("Can't get write access to mailbox, access is readonly",WARN);
      stream->rdonly = T;
    }
  }
  stream->local = fs_get (sizeof (MTXLOCAL));
  LOCAL->fd = fd;		/* bind the file */
  LOCAL->buf = (char *) fs_get (MAXMESSAGESIZE + 1);
  LOCAL->buflen = MAXMESSAGESIZE;
				/* note if an INBOX or not */
  stream->inbox = !strcmp(ucase (strcpy (LOCAL->buf,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 = time (0);
				/* parse mailbox */
  stream->nmsgs = stream->recent = 0;
  if (mtx_ping (stream) && !stream->nmsgs)
    mm_log ("Mailbox is empty",(long) NIL);
  if (!LOCAL) return NIL;	/* failure if stream died */
  stream->perm_seen = stream->perm_deleted =
    stream->perm_flagged = stream->perm_answered = stream->perm_draft =
      stream->rdonly ? NIL : T;
  stream->perm_user_flags = stream->rdonly ? NIL : 0xffffffff;
  return stream;		/* return stream to caller */
}

/* MTX mail close
 * Accepts: MAIL stream
 *	    close options
 */

void mtx_close (MAILSTREAM *stream,long options)
{
  if (stream && LOCAL) {	/* only if a file is open */
    int silent = stream->silent;
    stream->silent = T;		/* note this stream is dying */
    if (options & CL_EXPUNGE) mtx_expunge (stream);
    stream->silent = silent;	/* restore previous status */
    flock (LOCAL->fd,LOCK_UN);	/* unlock local file */
    close (LOCAL->fd);		/* close the local file */
				/* free local text buffer */
    if (LOCAL->buf) fs_give ((void **) &LOCAL->buf);
				/* nuke the local data */
    fs_give ((void **) &stream->local);
    stream->dtb = NIL;		/* log out the DTB */