news.c

mgcp协议源代码。支持多种编码：g711

/*
 * Program:	News routines
 *
 * Author:	Mark Crispin
 *		Networks and Distributed Computing
 *		Computing & Communications
 *		University of Washington
 *		Administration Building, AG-44
 *		Seattle, WA  98195
 *		Internet: [e-mail]
 *
 * Date:	4 September 1991
 * Last Edited:	24 January 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 <sys/stat.h>
#include <sys/time.h>
#include "news.h"
#include "misc.h"
#include "newsrc.h"

/* News routines */


/* Driver dispatch used by MAIL */

DRIVER newsdriver = {
  "news",			/* driver name */
				/* driver flags */
  DR_NEWS|DR_READONLY|DR_NOFAST|DR_NAMESPACE,
  (DRIVER *) NIL,		/* next driver */
  news_valid,			/* mailbox is valid for us */
  news_parameters,		/* manipulate parameters */
  news_scan,			/* scan mailboxes */
  news_list,			/* find mailboxes */
  news_lsub,			/* find subscribed mailboxes */
  news_subscribe,		/* subscribe to mailbox */
  news_unsubscribe,		/* unsubscribe from mailbox */
  news_create,			/* create mailbox */
  news_delete,			/* delete mailbox */
  news_rename,			/* rename mailbox */
  NIL,				/* status of mailbox */
  news_open,			/* open mailbox */
  news_close,			/* close mailbox */
  news_fast,			/* fetch message "fast" attributes */
  news_flags,			/* fetch message flags */
  NIL,				/* fetch overview */
  NIL,				/* fetch message envelopes */
  news_header,			/* fetch message header */
  news_text,			/* fetch message body */
  NIL,				/* fetch partial message text */
  NIL,				/* unique identifier */
  NIL,				/* message number */
  NIL,				/* modify flags */
  news_flagmsg,			/* per-message modify flags */
  NIL,				/* search for message based on criteria */
  NIL,				/* sort messages */
  NIL,				/* thread messages */
  news_ping,			/* ping mailbox to see if still alive */
  news_check,			/* check for new messages */
  news_expunge,			/* expunge deleted messages */
  news_copy,			/* copy messages to another mailbox */
  news_append,			/* append string message to mailbox */
  NIL				/* garbage collect stream */
};

				/* prototype stream */
MAILSTREAM newsproto = {&newsdriver};

/* News validate mailbox
 * Accepts: mailbox name
 * Returns: our driver if name is valid, NIL otherwise
 */

DRIVER *news_valid (char *name)
{
  int fd;
  char *s,*t,*u;
  struct stat sbuf;
  if ((name[0] == '#') && (name[1] == 'n') && (name[2] == 'e') &&
      (name[3] == 'w') && (name[4] == 's') && (name[5] == '.') &&
      !strchr (name,'/') &&
      !stat ((char *) mail_parameters (NIL,GET_NEWSSPOOL,NIL),&sbuf) &&
      ((fd = open ((char *) mail_parameters (NIL,GET_NEWSACTIVE,NIL),O_RDONLY,
		   NIL)) >= 0)) {
    fstat (fd,&sbuf);		/* get size of active file */
				/* slurp in active file */
    read (fd,t = s = (char *) fs_get (sbuf.st_size+1),sbuf.st_size);
    s[sbuf.st_size] = '\0';	/* tie off file */
    close (fd);			/* flush file */
    while (*t && (u = strchr (t,' '))) {
      *u++ = '\0';		/* tie off at end of name */
      if (!strcmp (name+6,t)) {
	fs_give ((void **) &s);	/* flush data */
	return &newsdriver;
      }
      t = 1 + strchr (u,'\n');	/* next line */
    }
    fs_give ((void **) &s);	/* flush data */
  }
  return NIL;			/* return status */
}

/* News manipulate driver parameters
 * Accepts: function code
 *	    function-dependent value
 * Returns: function-dependent return value
 */

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


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

void news_scan (MAILSTREAM *stream,char *ref,char *pat,char *contents)
{
  char tmp[MAILTMPLEN];
  if (news_canonicalize (ref,pat,tmp))
    mm_log ("Scan not valid for news mailboxes",ERROR);
}

/* News find list of newsgroups
 * Accepts: mail stream
 *	    reference
 *	    pattern to search
 */

void news_list (MAILSTREAM *stream,char *ref,char *pat)
{
  int fd;
  int i;
  char *s,*t,*u,pattern[MAILTMPLEN],name[MAILTMPLEN];
  struct stat sbuf;
  if (!pat || !*pat) {		/* empty pattern? */
    if (news_canonicalize (ref,"*",pattern)) {
				/* tie off name at root */
      if (s = strchr (pattern,'.')) *++s = '\0';
      else pattern[0] = '\0';
      mm_list (stream,'.',pattern,LATT_NOSELECT);
    }
  }
  if (news_canonicalize (ref,pat,pattern) &&
      !stat ((char *) mail_parameters (NIL,GET_NEWSSPOOL,NIL),&sbuf) &&
      ((fd = open ((char *) mail_parameters (NIL,GET_NEWSACTIVE,NIL),O_RDONLY,
		   NIL)) >= 0)) {
    fstat (fd,&sbuf);		/* get file size and read data */
    read (fd,s = (char *) fs_get (sbuf.st_size + 1),sbuf.st_size);
    close (fd);			/* close file */
    s[sbuf.st_size] = '\0';	/* tie off string */
    strcpy (name,"#news.");	/* write initial prefix */
    i = strlen (pattern);	/* length of pattern */
    if (pattern[--i] != '%') i = 0;
    if (t = strtok (s,"\n")) do if (u = strchr (t,' ')) {
      *u = '\0';		/* tie off at end of name */
      strcpy (name + 6,t);	/* make full form of name */
      if (pmatch_full (name,pattern,'.')) mm_list (stream,'.',name,NIL);
      else if (i && (u = strchr (name + i,'.'))) {
	*u = '\0';		/* tie off at delimiter, see if matches */
	if (pmatch_full (name,pattern,'.'))
	  mm_list (stream,'.',name,LATT_NOSELECT);
      }
    } while (t = strtok (NIL,"\n"));
    fs_give ((void **) &s);
  }
}

/* News find list of subscribed newsgroups
 * Accepts: mail stream
 *	    reference
 *	    pattern to search
 */

void news_lsub (MAILSTREAM *stream,char *ref,char *pat)
{
  char pattern[MAILTMPLEN];
				/* return data from newsrc */
  if (news_canonicalize (ref,pat,pattern)) newsrc_lsub (stream,pattern);
}


/* News canonicalize newsgroup name
 * Accepts: reference
 *	    pattern
 *	    returned single pattern
 * Returns: T on success, NIL on failure
 */

long news_canonicalize (char *ref,char *pat,char *pattern)
{
  if (ref && *ref) {		/* have a reference */
    strcpy (pattern,ref);	/* copy reference to pattern */
				/* # overrides mailbox field in reference */
    if (*pat == '#') strcpy (pattern,pat);
				/* pattern starts, reference ends, with . */
    else if ((*pat == '.') && (pattern[strlen (pattern) - 1] == '.'))
      strcat (pattern,pat + 1);	/* append, omitting one of the period */
    else strcat (pattern,pat);	/* anything else is just appended */
  }
  else strcpy (pattern,pat);	/* just have basic name */
  return ((pattern[0] == '#') && (pattern[1] == 'n') && (pattern[2] == 'e') &&
	  (pattern[3] == 'w') && (pattern[4] == 's') && (pattern[5] == '.') &&
	  !strchr (pattern,'/')) ? T : NIL;
}

/* News subscribe to mailbox
 * Accepts: mail stream
 *	    mailbox to add to subscription list
 * Returns: T on success, NIL on failure
 */

long news_subscribe (MAILSTREAM *stream,char *mailbox)
{
  return news_valid (mailbox) ? newsrc_update (stream,mailbox+6,':') : NIL;
}


/* NEWS unsubscribe to mailbox
 * Accepts: mail stream
 *	    mailbox to delete from subscription list
 * Returns: T on success, NIL on failure
 */

long news_unsubscribe (MAILSTREAM *stream,char *mailbox)
{
  return news_valid (mailbox) ? newsrc_update (stream,mailbox+6,'!') : NIL;
}

/* News create mailbox
 * Accepts: mail stream
 *	    mailbox name to create
 * Returns: T on success, NIL on failure
 */

long news_create (MAILSTREAM *stream,char *mailbox)
{
  return NIL;			/* never valid for News */
}


/* News delete mailbox
 *	    mailbox name to delete
 * Returns: T on success, NIL on failure
 */

long news_delete (MAILSTREAM *stream,char *mailbox)
{
  return NIL;			/* never valid for News */
}


/* News rename mailbox
 * Accepts: mail stream
 *	    old mailbox name
 *	    new mailbox name
 * Returns: T on success, NIL on failure
 */

long news_rename (MAILSTREAM *stream,char *old,char *newname)
{
  return NIL;			/* never valid for News */
}

/* News status of mailbox default handler
 * Accepts: mail stream
 *	    mailbox name
 *	    status flags
 * Returns: T on success, NIL on failure
 */

long news_status (MAILSTREAM *stream,char *mbx,long flags)
{
  MAILSTATUS status;
  unsigned long i;
  MAILSTREAM *tstream = NIL;
				/* make temporary stream (unless this mbx) */
  if ((!stream || strcmp (stream->mailbox,mbx)) &&
      !(stream = tstream = mail_open (NIL,mbx,OP_READONLY|OP_SILENT)))
    return NIL;
  status.flags = flags;		/* return status values */
  status.messages = stream->nmsgs;
  status.recent = stream->recent;
  if (flags & SA_UNSEEN)	/* must search to get unseen messages */