mbxnt.c

mgcp协议源代码。支持多种编码：g711

/*
 * Program:	MBX 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:	3 October 1995
 * 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 "mbxnt.h"
#include "misc.h"
#include "dummy.h"

/* MBX mail routines */


/* Driver dispatch used by MAIL */

DRIVER mbxdriver = {
  "mbx",			/* driver name */
  DR_LOCAL|DR_MAIL|DR_CRLF,	/* driver flags */
  (DRIVER *) NIL,		/* next driver */
  mbx_valid,			/* mailbox is valid for us */
  mbx_parameters,		/* manipulate parameters */
  mbx_scan,			/* scan mailboxes */
  mbx_list,			/* list mailboxes */
  mbx_lsub,			/* list subscribed mailboxes */
  NIL,				/* subscribe to mailbox */
  NIL,				/* unsubscribe from mailbox */
  mbx_create,			/* create mailbox */
  mbx_delete,			/* delete mailbox */
  mbx_rename,			/* rename mailbox */
  NIL,				/* status of mailbox */
  mbx_open,			/* open mailbox */
  mbx_close,			/* close mailbox */
  mbx_flags,			/* fetch message "fast" attributes */
  mbx_flags,			/* fetch message flags */
  NIL,				/* fetch overview */
  NIL,				/* fetch message envelopes */
  mbx_header,			/* fetch message header */
  mbx_text,			/* fetch message body */
  NIL,				/* fetch partial message text */
  NIL,				/* unique identifier */
  NIL,				/* message number */
  mbx_flag,			/* modify flags */
  mbx_flagmsg,			/* per-message modify flags */
  NIL,				/* search for message based on criteria */
  NIL,				/* sort messages */
  NIL,				/* thread messages */
  mbx_ping,			/* ping mailbox to see if still alive */
  mbx_check,			/* check for new messages */
  mbx_expunge,			/* expunge deleted messages */
  mbx_copy,			/* copy messages to another mailbox */
  mbx_append,			/* append string message to mailbox */
  NIL				/* garbage collect stream */
};

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

DRIVER *mbx_valid (char *name)
{
  char tmp[MAILTMPLEN];
  return mbx_isvalid (name,tmp) ? &mbxdriver : NIL;
}


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

int mbx_isvalid (char *name,char *tmp)
{
  int fd;
  int ret = NIL;
  char *s,hdr[HDRSIZE];
  struct stat sbuf;
  struct utimbuf times;
  errno = EINVAL;		/* assume invalid argument */
				/* if file, get its status */
  if ((s = mbx_file (tmp,name)) && !stat (s,&sbuf) &&
      ((sbuf.st_mode & S_IFMT) == S_IFREG) &&
      ((fd = open (tmp,O_BINARY|O_RDONLY,NIL)) >= 0)) {
    errno = -1;			/* bogus format */
    if ((read (fd,hdr,HDRSIZE) == HDRSIZE) &&
	(hdr[0] == '*') && (hdr[1] == 'm') && (hdr[2] == 'b') &&
	(hdr[3] == 'x') && (hdr[4] == '*') && (hdr[5] == '\015') &&
	(hdr[6] == '\012') && isxdigit (hdr[7]) && isxdigit (hdr[8]) &&
	isxdigit (hdr[9]) && isxdigit (hdr[10]) && isxdigit (hdr[11]) &&
	isxdigit (hdr[12]) && isxdigit (hdr[13]) && isxdigit (hdr[14]) &&
	isxdigit (hdr[15]) && isxdigit (hdr[16]) && isxdigit (hdr[17]) &&
	isxdigit (hdr[18]) && isxdigit (hdr[19]) && isxdigit (hdr[20]) &&
	isxdigit (hdr[21]) && isxdigit (hdr[22]) &&
	(hdr[23] == '\015') && (hdr[24] == '\012')) ret = T;
    close (fd);			/* close the file */
				/* preserve atime and mtime */
    times.actime = sbuf.st_atime;
    times.modtime = sbuf.st_mtime;
    utime (tmp,&times);		/* set the times */
  }
				/* in case INBOX but not mbx 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 */
}

/* MBX manipulate driver parameters
 * Accepts: function code
 *	    function-dependent value
 * Returns: function-dependent return value
 */

void *mbx_parameters (long function,void *value)
{
  void *ret = NIL;
  switch ((int) function) {
  case SET_ONETIMEEXPUNGEATPING:
    if (value && (((MBXLOCAL *) ((MAILSTREAM *) value)->local)->expunged))
      ((MBXLOCAL *) ((MAILSTREAM *) value)->local)->fullcheck = T;
  case GET_ONETIMEEXPUNGEATPING:
    if (value) ret = (void *)
      ((MBXLOCAL *) ((MAILSTREAM *) value)->local)->fullcheck;
    break;
  }
  return ret;
}


/* MBX mail scan mailboxes
 * Accepts: mail stream
 *	    reference
 *	    pattern to search
 *	    string to scan
 */

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


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

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


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

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

long mbx_create (MAILSTREAM *stream,char *mailbox)
{
  char *s,mbx[MAILTMPLEN],tmp[HDRSIZE];
  long ret = NIL;
  int i,fd;
  if (!(s = mbx_file (mbx,mailbox))) {
    sprintf (mbx,"Can't create %.80s: invalid name",mailbox);
    mm_log (mbx,ERROR);
    return NIL;
  }
				/* create underlying file */
  if (!dummy_create (stream,s)) return NIL;
				/* done if made directory */
  if ((s = strrchr (s,'\\')) && !s[1]) return T;
  if ((fd = open (mbx,O_BINARY|O_WRONLY,NIL)) < 0) {
    sprintf (tmp,"Can't reopen mailbox node %.80s: %s",mbx,strerror (errno));
    mm_log (tmp,ERROR);
    unlink (mbx);		/* delete the file */
    return NIL;
  }
  memset (tmp,'\0',HDRSIZE);	/* initialize header */
  sprintf (s = tmp,"*mbx*\015\012%08lx00000000\015\012",
	   (unsigned long) time (0));
  s += strlen (s);		/* move to end of pointer */
  for (i = 0; i < NUSERFLAGS; ++i) *s++ ='\015',*s++ = '\012';
  if (write (fd,tmp,HDRSIZE) != HDRSIZE) {
    sprintf (tmp,"Can't initialize mailbox node %.80s: %s",
	     mbx,strerror (errno));
    mm_log (tmp,ERROR);
    unlink (mbx);		/* delete the file */
    close (fd);
    return NIL;
  }
  return close (fd) ? NIL : T;	/* close file */
}


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

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

long mbx_rename (MAILSTREAM *stream,char *old,char *newname)
{
  long ret = T;
  char c,*s,tmp[MAILTMPLEN],file[MAILTMPLEN],lock[MAILTMPLEN];
  int ld;
  int fd = open (mbx_file (file,old),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 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: %s",old,strerror (errno));
      mm_log (tmp,ERROR);
      ret = NIL;		/* set failure */
    }
  }
  unlockfd (ld,lock);		/* release exclusive parse/append permission */
				/* recreate file if renamed INBOX */
  if (ret && !strcmp (ucase (strcpy (tmp,old)),"INBOX"))
    mbx_create (NIL,"INBOX");
  return ret;			/* return success */
}

/* MBX mail open
 * Accepts: stream to open
 * Returns: stream on success, NIL on failure
 */