ipop2d.c

广泛使用的邮件服务器！同时

				/* open mailbox, note # of messages */
  if (j = (stream = mail_open (stream,t,NIL)) ? stream->nmsgs : 0) {
    sprintf (tmp,"1:%lu",j);	/* fetch fast information for all messages */
    mail_fetch_fast (stream,tmp,NIL);
    msg = (unsigned long *) fs_get ((stream->nmsgs + 1) *
				    sizeof (unsigned long));
    for (i = 1; i <= j; i++)	/* find undeleted messages, add to vector */
      if (!mail_elt (stream,i)->deleted) msg[++nmsgs] = i;
  }
#ifndef DISABLE_POP_PROXY
  if (!stream && (flags == MU_ANONYMOUS)) {
    fputs ("- Bad login\015\012",stdout);
    return DONE;
  }
#endif
  printf ("#%lu messages in %s\015\012",nmsgs,stream ? stream->mailbox :
	  "<none>");
  return MBOX;
}

/* Parse READ command
 * Accepts: pointer to command argument
 * Returns: new state
 */

short c_read (char *t)
{
  MESSAGECACHE *elt = NIL;
  if (t && *t) {		/* have a message number argument? */
				/* validity check message number */
    if (((current = strtoul (t,NIL,10)) < 1) || (current > nmsgs)) {
      fputs ("- Invalid message number given to READ\015\012",stdout);
      return DONE;
    }
  }
  else if (current > nmsgs) {	/* at end of mailbox? */
    fputs ("=0 No more messages\015\012",stdout);
    return MBOX;
  }
				/* set size if message valid and exists */
  size = msg[current] ? (elt = mail_elt(stream,msg[current]))->rfc822_size : 0;
  if (elt) sprintf (status,"Status: %s%s\015\012",
		    elt->seen ? "R" : " ",elt->recent ? " " : "O");
  else status[0] = '\0';	/* no status */
  size += strlen (status);	/* update size to reflect status */
				/* display results */
  printf ("=%lu characters in message %lu\015\012",size + 2,current);
  return ITEM;
}


/* Parse RETR command
 * Accepts: pointer to command argument
 * Returns: new state
 */

short c_retr (char *t)
{
  unsigned long i,j;
  STRING *bs;
  if (t) {			/* disallow argument */
    fputs ("- Bogus argument given to RETR\015\012",stdout);
    return DONE;
  }
  if (size) {			/* message size valid? */
    t = mail_fetch_header (stream,msg[current],NIL,NIL,&i,FT_PEEK);
    if (i > 2) {		/* only if there is something */
      i -= 2;			/* lop off last two octets */
      while (i) {		/* blat the header */
	if (!(j = fwrite (t,sizeof (char),i,stdout))) return DONE;
	if (i -= j) t += j;	/* advance to incomplete data */
      }
    }
    fputs (status,stdout);	/* yes, output message */
    fputs ("\015\012",stdout);	/* delimit header from text */
    if (t = mail_fetch_text (stream,msg[current],NIL,&i,FT_RETURNSTRINGSTRUCT))
      while (i) {		/* blat the text */
	if (!(j = fwrite (t,sizeof (char),i,stdout))) return DONE;
	if (i -= j) t += j;	/* advance to incomplete data */
      }
    else for (bs = &stream->private.string; i--; )
      if (putc (SNX (bs),stdout) == EOF) return DONE;
    fputs ("\015\012",stdout);	/* trailer to coddle PCNFS' NFSMAIL */
  }
  else return DONE;		/* otherwise go away */
  return NEXT;
}

/* Parse ACKS command
 * Accepts: pointer to command argument
 * Returns: new state
 */

short c_acks (char *t)
{
  char tmp[TMPLEN];
  if (t) {			/* disallow argument */
    fputs ("- Bogus argument given to ACKS\015\012",stdout);
    return DONE;
  }
				/* mark message as seen */
  sprintf (tmp,"%lu",msg[current++]);
  mail_setflag (stream,tmp,"\\Seen");
  return c_read (NIL);		/* end message reading transaction */
}


/* Parse ACKD command
 * Accepts: pointer to command argument
 * Returns: new state
 */

short c_ackd (char *t)
{
  char tmp[TMPLEN];
  if (t) {			/* disallow argument */
    fputs ("- Bogus argument given to ACKD\015\012",stdout);
    return DONE;
  }
				/* mark message as seen and deleted */
  sprintf (tmp,"%lu",msg[current]);
  mail_setflag (stream,tmp,"\\Seen \\Deleted");
  msg[current++] = 0;		/* mark message as deleted */
  return c_read (NIL);		/* end message reading transaction */
}


/* Parse NACK command
 * Accepts: pointer to command argument
 * Returns: new state
 */

short c_nack (char *t)
{
  if (t) {			/* disallow argument */
    fputs ("- Bogus argument given to NACK\015\012",stdout);
    return DONE;
  }
  return c_read (NIL);		/* end message reading transaction */
}

/* Co-routines from MAIL library */


/* Message matches a search
 * Accepts: MAIL stream
 *	    message number
 */

void mm_searched (MAILSTREAM *stream,unsigned long msgno)
{
  /* Never called */
}


/* Message exists (i.e. there are that many messages in the mailbox)
 * Accepts: MAIL stream
 *	    message number
 */

void mm_exists (MAILSTREAM *stream,unsigned long number)
{
  /* Can't use this mechanism.  POP has no means of notifying the client of
     new mail during the session. */
}


/* Message expunged
 * Accepts: MAIL stream
 *	    message number
 */

void mm_expunged (MAILSTREAM *stream,unsigned long number)
{
  if (state != DONE) {		/* ignore if closing */
				/* someone else screwed us */
    goodbye = "- Mailbox expunged from under me!\015\012";
    if (stream && !stream->lock) mail_close (stream);
    stream = NIL;
    sayonara (1);
  }
}


/* Message status changed
 * Accepts: MAIL stream
 *	    message number
 */

void mm_flags (MAILSTREAM *stream,unsigned long number)
{
  /* This isn't used */
}


/* Mailbox found
 * Accepts: MAIL stream
 *	    hierarchy delimiter
 *	    mailbox name
 *	    mailbox attributes
 */

void mm_list (MAILSTREAM *stream,int delimiter,char *name,long attributes)
{
  /* This isn't used */
}


/* Subscribe mailbox found
 * Accepts: MAIL stream
 *	    hierarchy delimiter
 *	    mailbox name
 *	    mailbox attributes
 */

void mm_lsub (MAILSTREAM *stream,int delimiter,char *name,long attributes)
{
  /* This isn't used */
}


/* Mailbox status
 * Accepts: MAIL stream
 *	    mailbox name
 *	    mailbox status
 */

void mm_status (MAILSTREAM *stream,char *mailbox,MAILSTATUS *status)
{
  /* This isn't used */
}

/* Notification event
 * Accepts: MAIL stream
 *	    string to log
 *	    error flag
 */

void mm_notify (MAILSTREAM *stream,char *string,long errflg)
{
  mm_log (string,errflg);	/* just do mm_log action */
}


/* Log an event for the user to see
 * Accepts: string to log
 *	    error flag
 */

void mm_log (char *string,long errflg)
{
  switch (errflg) {
  case NIL:			/* information message */
  case PARSE:			/* parse glitch */
    break;			/* too many of these to log */
  case WARN:			/* warning */
    syslog (LOG_DEBUG,"%s",string);
    break;
  case BYE:			/* driver broke connection */
    if (state != DONE) {
      char tmp[MAILTMPLEN];
      alarm (0);		/* disable all interrupts */
      server_init (NIL,NIL,NIL,SIG_IGN,SIG_IGN,SIG_IGN,SIG_IGN,SIG_IGN);
      sprintf (logout = tmp,"Mailbox closed (%.80s)",string);
      sayonara (1);
    }
    break;
  case ERROR:			/* error that broke command */
  default:			/* default should never happen */
    syslog (LOG_NOTICE,"%s",string);
    break;
  }
}


/* Log an event to debugging telemetry
 * Accepts: string to log
 */

void mm_dlog (char *string)
{
  /* Not doing anything here for now */
}


/* Get user name and password for this host
 * Accepts: parse of network mailbox name
 *	    where to return user name
 *	    where to return password
 *	    trial count
 */

void mm_login (NETMBX *mb,char *username,char *password,long trial)
{
				/* set user name */
  strncpy (username,*mb->user ? mb->user : user,NETMAXUSER-1);
  strncpy (password,pass,255);	/* and password */
  username[NETMAXUSER] = password[255] = '\0';
}

/* About to enter critical code
 * Accepts: stream
 */

void mm_critical (MAILSTREAM *stream)
{
  ++critical;
}


/* About to exit critical code
 * Accepts: stream
 */

void mm_nocritical (MAILSTREAM *stream)
{
  --critical;
}


/* Disk error found
 * Accepts: stream
 *	    system error code
 *	    flag indicating that mailbox may be clobbered
 * Returns: abort flag
 */

long mm_diskerror (MAILSTREAM *stream,long errcode,long serious)
{
  if (serious) {		/* try your damnest if clobberage likely */
    syslog (LOG_ALERT,
	    "Retrying after disk error user=%.80s host=%.80s mbx=%.80s: %.80s",
	    user,tcp_clienthost (),
	    (stream && stream->mailbox) ? stream->mailbox : "???",
	    strerror (errcode));
    alarm (0);			/* make damn sure timeout disabled */
    sleep (60);			/* give it some time to clear up */
    return NIL;
  }
  syslog (LOG_ALERT,"Fatal disk error user=%.80s host=%.80s mbx=%.80s: %.80s",
	  user,tcp_clienthost (),
	  (stream && stream->mailbox) ? stream->mailbox : "???",
	  strerror (errcode));
  return T;
}


/* Log a fatal error event
 * Accepts: string to log
 */

void mm_fatal (char *string)
{
  mm_log (string,ERROR);	/* shouldn't happen normally */
}