bezrkdos.c

mgcp协议源代码。支持多种编码：g711

/*
 * Program:	Berkeley 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:	24 June 1992
 * Last Edited:	25 February 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.
 *
 */


/* Dedication:
 *  This file is dedicated with affection to those Merry Marvels of Musical
 * Madness . . .
 *  ->  The Incomparable Leland Stanford Junior University Marching Band  <-
 * who entertain, awaken, and outrage Stanford fans in the fact of repeated
 * losing seasons and shattered Rose Bowl dreams [Cardinal just don't have
 * HUSKY FEVER!!!].
 *
 */

#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include "mail.h"
#include "osdep.h"
#include <time.h>
#include <sys\stat.h>
#include <dos.h>
#include "bezrkdos.h"
#include "rfc822.h"
#include "dummy.h"
#include "misc.h"
#include "fdstring.h"

/* Berkeley mail routines */


/* Driver dispatch used by MAIL */

DRIVER bezerkdriver = {
  "bezerk",			/* driver name */
				/* driver flags */
  DR_LOCAL|DR_MAIL|DR_LOWMEM|DR_CRLF|DR_NOSTICKY,
  (DRIVER *) NIL,		/* next driver */
  bezerk_valid,			/* mailbox is valid for us */
  bezerk_parameters,		/* manipulate parameters */
  bezerk_scan,			/* scan mailboxes */
  bezerk_list,			/* list mailboxes */
  bezerk_lsub,			/* list subscribed mailboxes */
  NIL,				/* subscribe to mailbox */
  NIL,				/* unsubscribe from mailbox */
  bezerk_create,		/* create mailbox */
  bezerk_delete,		/* delete mailbox */
  bezerk_rename,		/* rename mailbox */
  NIL,				/* status of mailbox */
  bezerk_open,			/* open mailbox */
  bezerk_close,			/* close mailbox */
  NIL,				/* fetch message "fast" attributes */
  NIL,				/* fetch message flags */
  NIL,				/* fetch overview */
  NIL,				/* fetch message envelopes */
  bezerk_header,		/* fetch message header */
  bezerk_text,			/* fetch message text */
  NIL,				/* fetch partial message text */
  NIL,				/* unique identifier */
  NIL,				/* message number */
  NIL,				/* modify flags */
  NIL,				/* per-message modify flags */
  NIL,				/* search for message based on criteria */
  NIL,				/* sort messages */
  NIL,				/* thread messages */
  bezerk_ping,			/* ping mailbox to see if still alive */
  bezerk_check,			/* check for new messages */
  bezerk_expunge,		/* expunge deleted messages */
  bezerk_copy,			/* copy messages to another mailbox */
  bezerk_append,		/* append string message to mailbox */
  NIL				/* garbage collect stream */
};

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

DRIVER *bezerk_valid (char *name)
{
  char tmp[MAILTMPLEN];
  return bezerk_isvalid (name,tmp) ? &bezerkdriver : (DRIVER *) NIL;
}


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

long bezerk_isvalid (char *name,char *tmp)
{
  int fd;
  long ret = NIL;
  struct stat sbuf;
  errno = EINVAL;		/* assume invalid argument */
				/* if file, get its status */
  if ((*name != '{') && mailboxfile (tmp,name) && !stat (tmp,&sbuf)) {
    if (!sbuf.st_size)errno = 0;/* empty file */
    else if ((fd = open (tmp,O_BINARY|O_RDONLY,NIL)) >= 0) {
      memset (tmp,'\0',MAILTMPLEN);
      errno = -1;		/* in case bezerk_valid_line fails */
      if (read (fd,tmp,MAILTMPLEN-1) >= 0)
	ret = bezerk_valid_line (tmp,NIL,NIL);
      close (fd);		/* close the file */
    }
  }
				/* in case INBOX but not bezerk 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 */
}

/* Validate line
 * Accepts: pointer to candidate string to validate as a From header
 *	    return pointer to end of date/time field
 *	    return pointer to offset from t of time (hours of ``mmm dd hh:mm'')
 *	    return pointer to offset from t of time zone (if non-zero)
 * Returns: t,ti,zn set if valid From string, else ti is NIL
 */

int bezerk_valid_line (char *s,char **rx,int *rzn)
{
  char *x;
  int zn;
  int ti = 0;
				/* line must begin with "From " */
  if ((*s != 'F') || (s[1] != 'r') || (s[2] != 'o') || (s[3] != 'm') ||
	(s[4] != ' ')) return NIL;
				/* find end of line */
  for (x = s + 5; *x && *x != '\012'; x++);
  if (!x) return NIL;		/* end of line not found */
  if (x[-1] == '\015') x--;	/* ignore CR */
  if ((x - s < 27)) return NIL;	/* line too short */
  if (x - s >= 41) {		/* possible search for " remote from " */
    for (zn = -1; x[zn] != ' '; zn--);
    if ((x[zn-1] == 'm') && (x[zn-2] == 'o') && (x[zn-3] == 'r') &&
	(x[zn-4] == 'f') && (x[zn-5] == ' ') && (x[zn-6] == 'e') &&
	(x[zn-7] == 't') && (x[zn-8] == 'o') && (x[zn-9] == 'm') &&
	(x[zn-10] == 'e') && (x[zn-11] == 'r') && (x[zn-12] == ' '))
      x += zn - 12;
  }
  if (x[-5] == ' ') {		/* ends with year? */
				/* no timezone? */
    if (x[-8] == ':') zn = 0,ti = -5;
				/* three letter timezone? */
    else if (x[-9] == ' ') ti = zn = -9;
				/* numeric timezone? */
    else if ((x[-11]==' ') && ((x[-10]=='+') || (x[-10]=='-'))) ti = zn = -11;
  }
  else if (x[-4] == ' ') {	/* no year and three leter timezone? */
    if (x[-9] == ' ') zn = -4,ti = -9;
  }
  else if (x[-6] == ' ') {	/* no year and numeric timezone? */
    if ((x[-11] == ' ') && ((x[-5] == '+') || (x[-5] == '-')))
      zn = -6,ti = -11;
  }
				/* time must be www mmm dd hh:mm[:ss] */
  if (ti && !((x[ti - 3] == ':') &&
	      (x[ti -= ((x[ti - 6] == ':') ? 9 : 6)] == ' ') &&
	      (x[ti - 3] == ' ') && (x[ti - 7] == ' ') &&
	      (x[ti - 11] == ' '))) return NIL;
  if (rx) *rx = x;		/* set return values */
  if (rzn) *rzn = zn;
  return ti;
}

/* Berkeley manipulate driver parameters
 * Accepts: function code
 *	    function-dependent value
 * Returns: function-dependent return value
 */

void *bezerk_parameters (long function,void *value)
{
  return NIL;
}


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

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


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

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


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

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

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


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

long bezerk_delete (MAILSTREAM *stream,char *mailbox)
{
  return dummy_delete (stream,mailbox);
}


/* Berkeley mail rename mailbox
 * Accepts: MAIL stream
 *	    old mailbox name
 *	    new mailbox name (or NIL for delete)
 * Returns: T on success, NIL on failure
 */

long bezerk_rename (MAILSTREAM *stream,char *old,char *newname)
{
  return dummy_rename (stream,old,newname);
}

/* Berkeley mail open
 * Accepts: stream to open
 * Returns: stream on success, NIL on failure
 */

MAILSTREAM *bezerk_open (MAILSTREAM *stream)
{
  long i;
  int fd;
  char *s;
  char tmp[MAILTMPLEN];
				/* return prototype for OP_PROTOTYPE call */
  if (!stream) return &bezerkproto;
  if (stream->local) fatal ("bezerk recycle stream");
  if (!mailboxfile (tmp,stream->mailbox))
    return (MAILSTREAM *) bezerk_badname (tmp,stream->mailbox);
  if (((fd = open (tmp,O_BINARY|O_RDONLY,NIL)) < 0)) {
    sprintf (tmp,"Can't open mailbox: %s",strerror (errno));
    mm_log (tmp,ERROR);
    return NIL;
  }
  stream->rdonly = T;		/* this driver is readonly */
  stream->local = fs_get (sizeof (BEZERKLOCAL));
				/* canonicalize the stream mailbox name */
  fs_give ((void **) &stream->mailbox);
  if (s = strchr ((s = strrchr (tmp,'\\')) ? s : tmp,'.')) *s = '\0';
  stream->mailbox = cpystr (tmp);
  LOCAL->fd = fd;		/* note the file */
  LOCAL->filesize = 0;		/* initialize parsed file size */
  LOCAL->buf = NIL;		/* initially no local buffer */
  stream->sequence++;		/* bump sequence number */
  stream->uid_validity = time (0);
				/* parse mailbox */
  stream->nmsgs = stream->recent = 0;
  if (!bezerk_ping (stream)) return NIL;
  if (!stream->nmsgs) mm_log ("Mailbox is empty",(long) NIL);
  stream->perm_seen = stream->perm_deleted =
    stream->perm_flagged = stream->perm_answered = stream->perm_draft = NIL;
  stream->perm_user_flags = NIL;
  return stream;		/* return stream to caller */
}

/* Berkeley mail close
 * Accepts: MAIL stream
 *	    close options
 */

void bezerk_close (MAILSTREAM *stream,long options)
{
  if (stream && LOCAL) {	/* only if a file is open */
    int silent = stream->silent;
    stream->silent = T;
    if (options & CL_EXPUNGE) bezerk_expunge (stream);
    close (LOCAL->fd);		/* close the local file */
    if (LOCAL->buf) fs_give ((void **) &LOCAL->buf);
				/* nuke the local data */
    fs_give ((void **) &stream->local);
    stream->dtb = NIL;		/* log out the DTB */
  }
}

/* Berkeley 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 *bezerk_header (MAILSTREAM *stream,unsigned long msgno,
		     unsigned long *length,long flags)
{
  char tmp[MAILTMPLEN];
  *length = 0;			/* default to empty */
  if (flags & FT_UID) return "";/* UID call "impossible" */
				/* get to header position */
  lseek (LOCAL->fd,bezerk_hdrpos (stream,msgno,length),L_SET);
				/* is buffer big enough? */
  if (LOCAL->buf) fs_give ((void **) &LOCAL->buf);
  LOCAL->buf = (char *) fs_get ((size_t) *length + 1);
  LOCAL->buf[*length] = '\0';	/* tie off string */
				/* slurp the data */
  read (LOCAL->fd,LOCAL->buf,(size_t) *length);
  return LOCAL->buf;
}


/* Berkeley mail fetch message text (body only)
 * Accepts: MAIL stream
 *	    message # to fetch
 *	    pointer to returned header text length
 *	    option flags
 * Returns: T, always
 */

long bezerk_text (MAILSTREAM *stream,unsigned long msgno,STRING *bs,long flags)
{
  MESSAGECACHE *elt;
  FDDATA d;
  unsigned long hdrsize,hdrpos;
				/* UID call "impossible" */
  if (flags & FT_UID) return NIL;
  elt = mail_elt (stream,msgno);/* if message not seen */
				/* mark message as seen */
  if (elt->seen && !(flags & FT_PEEK)) {
    elt->seen = T;
    mm_flags (stream,msgno);
  }
				/* get location of text data */
  hdrpos = bezerk_hdrpos (stream,msgno,&hdrsize);
  d.fd = LOCAL->fd;		/* set initial stringstruct */
  d.pos = hdrpos + hdrsize;
				/* flush old buffer */
  if (LOCAL->buf) fs_give ((void **) &LOCAL->buf);
  d.chunk = LOCAL->buf = (char *) fs_get ((size_t) d.chunksize = CHUNK);
  INIT (bs,fd_string,(void *) &d,elt->rfc822_size - hdrsize);
  return T;			/* success */
}

/* Berkeley mail ping mailbox
 * Accepts: MAIL stream
 * Returns: T if stream still alive, NIL if not
 */

long bezerk_ping (MAILSTREAM *stream)
{
				/* punt if stream no longer alive */
  if (!(stream && LOCAL)) return NIL;
				/* parse mailbox, punt if parse dies */
  return (bezerk_parse (stream)) ? T : NIL;
}


/* Berkeley mail check mailbox (reparses status too)
 * Accepts: MAIL stream
 */