unixnt.c

mgcp协议源代码。支持多种编码：g711

/*
 * Program:	UNIX 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:	20 December 1989
 * Last Edited:	1 September 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 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 "mail.h"
#include "osdep.h"
#include <time.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/utime.h>
#define DOTLOCK char
#include "unixnt.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)
{
  int fd;
  DRIVER *ret = NIL;
  int c,r;
  char tmp[MAILTMPLEN],file[MAILTMPLEN],*s,*t;
  struct stat sbuf;
  struct utimbuf times;
  errno = EINVAL;		/* assume invalid argument */
				/* must be non-empty file */
  if ((t = dummy_file (file,name)) && !stat (t,&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,MAILTMPLEN-1) <= 0) errno = -1;
      else {			/* ignore leading whitespace */
	for (s = tmp,c = '\n';
	     (*s == '\r') || (*s == '\n') || (*s == ' ') || (*s == '\t');
	     c = *s++);
	if (c == '\n') {	/* at start of a line? */
	  VALID (s,t,r,c);	/* yes, validate format */
	  if (r) ret = &unixdriver;
	  else errno = -1;	/* invalid 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 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 manipulate driver parameters
 * Accepts: function code
 *	    function-dependent value
 * Returns: function-dependent return value
 */

void *unix_parameters (long function,void *value)
{
  void *ret = NIL;
  switch ((int) function) {
  case SET_FROMWIDGET:
    unix_fromwidget = (long) value;
  case GET_FROMWIDGET:
    ret = (void *) unix_fromwidget;
    break;
  }
  return ret;
}

/* 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,mbx[MAILTMPLEN],tmp[MAILTMPLEN], ctmp[MAILTMPLEN];
  long ret = NIL;
  int fd, ctmplen;
  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]) return T;
    if ((fd = open (mbx,O_WRONLY|O_BINARY,
		    (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 */
    }
    else {			/* initialize header */
      memset (tmp,'\0',MAILTMPLEN);
      strcpy(ctmp, ctime(&ti));
      ctmplen = strlen(ctmp);
      if(ctmp[ctmplen-2] == '\r') ctmp[ctmplen-2] = '\0';
      else if(ctmp[ctmplen-1] == '\n') ctmp[ctmplen-1] = '\0';
      sprintf (tmp,"From %s %s\r\nDate: ",pseudo_from,ctmp);
      rfc822_fixed_date (s = tmp + strlen (tmp));
      sprintf (s += strlen (s),	/* write the pseudo-header */
	       "\r\nFrom: %s <%s@%s>\r\nSubject: %s\r\nX-IMAP: %010lu 0000000000\r\nStatus: RO\r\n\r\n%s\r\n\r\n",
	       pseudo_name,pseudo_from,mylocalhost (),pseudo_subject,
	       (unsigned long) ti,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 */
    }
    close (fd);			/* close file */
  }
  return ret;
}


/* 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 = NIL;
  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) ||
		  ((s = strrchr (s,'\\')) && !s[1])))
    sprintf (tmp,"Can't rename mailbox %.80s to %.80s: invalid name",
	     old,newname);
  else if ((ld = lockname (lock,dummy_file (file,old),NIL)) < 0)
    sprintf (tmp,"Can't get lock for mailbox %.80s",old);
  else {			/* lock out other c-clients */
    if (flock (ld,LOCK_EX|LOCK_NB)) {
      close (ld);		/* couldn't lock, give up on it then */
      sprintf (tmp,"Mailbox %.80s is in use by another process",old);
    }
				/* lock out non c-client applications */
    else if ((fd = unix_lock (file,O_BINARY|O_RDWR,S_IREAD|S_IWRITE,lockx,
			      LOCK_EX)) < 0)
      sprintf (tmp,"Can't lock mailbox %.80s: %s",old,strerror (errno));
    else {
      unix_unlock(fd,NIL,lockx);/* pacify evil NTFS */
      if (newname) {		/* want rename? */
				/* 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,newname)) {
	      flock (ld,LOCK_UN);
	      close (ld);	/* close c-client lock */
	      unlink (lock);	/* and delete it */
	      mm_nocritical (stream);
	      return NIL;	/* couldn't create superior */
	    }
	  }
	  else *s = '\\';	/* restore delimiter */
	  s[1] = c;		/* restore character after delimiter */
	}
	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))	/* want delete */
	sprintf (tmp,"Can't delete mailbox %.80s: %s",old,strerror (errno));
      else ret = T;		/* set success */
      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)
{
  int fd;
  char tmp[MAILTMPLEN];
				/* return prototype for OP_PROTOTYPE call */
  if (!stream) return &unixproto;
  if (stream->local) fatal ("unix recycle stream");
  stream->local = memset (fs_get (sizeof (UNIXLOCAL)),0,sizeof (UNIXLOCAL));
				/* note if an INBOX or not */
  stream->inbox = !strcmp (ucase (strcpy (tmp,stream->mailbox)),"INBOX");
				/* 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 */