ipop3d.c

Vovida 社区开源的 SIP 协议源码

    }
    state = LOGOUT;
    stream = NIL;
    _exit (1);			/* die die die */
  }
}


/* Kiss Of Death interrupt
 */

void kodint ()
{
				/* only if idle */
  if (idletime && ((time (0) - idletime) > KODTIMEOUT)) {
    alarm (0);			/* disable all interrupts */
    server_init (NIL,NIL,NIL,NIL,SIG_IGN,SIG_IGN,SIG_IGN,SIG_IGN);
    PSOUT ("-ERR Received Kiss of Death\015\012");
    syslog (LOG_INFO,"Killed (lost mailbox lock) user=%.80s host=%.80s",
	    user ? user : "???",tcp_clienthost ());
    if (critical) state =LOGOUT;/* must defer if in critical code */
    else {			/* try to gracefully close the stream */
      if ((state == TRANSACTION) && !stream->lock) {
	rset ();
	mail_close (stream);
      }
      state = LOGOUT;
      stream = NIL;
      _exit (1);		/* die die die */
    }
  }
}


/* Hangup interrupt
 */

void hupint ()
{
  alarm (0);			/* disable all interrupts */
  server_init (NIL,NIL,NIL,NIL,SIG_IGN,SIG_IGN,SIG_IGN,SIG_IGN);
  syslog (LOG_INFO,"Hangup user=%.80s host=%.80s",user ? user : "???",
	  tcp_clienthost ());
  if (critical) state = LOGOUT;	/* must defer if in critical code */
  else {			/* try to gracefully close the stream */
    if ((state == TRANSACTION) && !stream->lock) {
      rset ();
      mail_close (stream);
    }
    state = LOGOUT;
    stream = NIL;
    _exit (1);			/* die die die */
  }
}


/* Termination interrupt
 */

void trmint ()
{
  alarm (0);			/* disable all interrupts */
  server_init (NIL,NIL,NIL,NIL,SIG_IGN,SIG_IGN,SIG_IGN,SIG_IGN);
  PSOUT ("-ERR Killed\015\012");
  syslog (LOG_INFO,"Killed user=%.80s host=%.80s",user ? user : "???",
	  tcp_clienthost ());
  if (critical) state = LOGOUT;	/* must defer if in critical code */
  else {			/* try to gracefully close the stream */
    if ((state == TRANSACTION) && !stream->lock) {
      rset ();
      mail_close (stream);
    }
    state = LOGOUT;
    stream = NIL;
    _exit (1);			/* die die die */
  }
}

/* Parse PASS command
 * Accepts: pointer to command argument
 * Returns: new state
 */

int login (char *t,int argc,char *argv[])
{
  char tmp[TMPLEN];
				/* flush old passowrd */
  if (pass) fs_give ((void **) &pass);
  if (!(t && *t)) {		/* if no password given */
    PSOUT ("-ERR Missing password argument\015\012");
    return AUTHORIZATION;
  }
  pass = cpystr (t);		/* copy password argument */
  if (!host) {			/* want remote mailbox? */
				/* no, delimit user from possible admin */
    if (t = strchr (user,'*')) *t++ ='\0';
				/* attempt the login */
    if (server_login (user,pass,t,argc,argv)) {
      int ret = mbxopen ("INBOX");
      if (ret == TRANSACTION)	/* mailbox opened OK? */
	syslog (LOG_INFO,"%sLogin user=%.80s host=%.80s nmsgs=%ld/%ld",
		t ? "Admin " : "",user,tcp_clienthost (),nmsgs,stream->nmsgs);
      else syslog (LOG_INFO,"%sLogin user=%.80s host=%.80s no mailbox",
		   t ? "Admin " : "",user,tcp_clienthost ());
      return ret;
    }
  }
#ifndef DISABLE_POP_PROXY
				/* remote; build remote INBOX */
  else if (anonymous_login (argc,argv)) {
    syslog (LOG_INFO,"IMAP login to host=%.80s user=%.80s host=%.80s",host,
	    user,tcp_clienthost ());
    sprintf (tmp,"{%.128s/user=%.128s}INBOX",host,user);
				/* disable rimap just in case */
    mail_parameters (NIL,SET_RSHTIMEOUT,0);
    return mbxopen (tmp);
  }
#endif
				/* vague error message to confuse crackers */
  PSOUT ("-ERR Bad login\015\012");
  return AUTHORIZATION;
}

/* Authentication responder
 * Accepts: challenge
 *	    length of challenge
 *	    pointer to response length return location if non-NIL
 * Returns: response
 */

#define RESPBUFLEN 8*MAILTMPLEN

char *responder (void *challenge,unsigned long clen,unsigned long *rlen)
{
  unsigned long i,j;
  unsigned char *t,resp[RESPBUFLEN];
  if (initial) {		/* initial response given? */
    if (clen) return NIL;	/* not permitted */
				/* set up response */
    t = (unsigned char *) initial;
    initial = NIL;		/* no more initial response */
    return (char *) rfc822_base64 (t,strlen ((char *) t),rlen ? rlen : &i);
  }
  PSOUT ("+ ");
  for (t = rfc822_binary (challenge,clen,&i),j = 0; j < i; j++)
    if (t[j] > ' ') PBOUT (t[j]);
  fs_give ((void **) &t);
  CRLF;
  PFLUSH;			/* dump output buffer */
  resp[RESPBUFLEN-1] = '\0';	/* last buffer character is guaranteed NUL */
  alarm (LOGINTIMEOUT);		/* get a response under timeout */
  clearerr (stdin);		/* clear stdin errors */
				/* read buffer */
  while (!PSIN ((char *) resp,RESPBUFLEN)) {
				/* ignore if some interrupt */
    if (ferror (stdin) && (errno == EINTR)) clearerr (stdin);
    else {
      char *e = ferror (stdin) ?
	strerror (errno) : "Command stream end of file";
      alarm (0);		/* disable all interrupts */
      server_init (NIL,NIL,NIL,NIL,SIG_IGN,SIG_IGN,SIG_IGN,SIG_IGN);
      syslog (LOG_INFO,"%s, while reading authentication host=%.80s",
	      e,tcp_clienthost ());
      state = UPDATE;
      _exit (1);
    }
  }
  if (!(t = (unsigned char *) strchr ((char *) resp,'\012'))) {
    int c;
    while ((c = PBIN ()) != '\012') if (c == EOF) {
				/* ignore if some interrupt */
      if (ferror (stdin) && (errno == EINTR)) clearerr (stdin);
      else {
	char *e = ferror (stdin) ?
	  strerror (errno) : "Command stream end of file";
	alarm (0);		/* disable all interrupts */
	server_init (NIL,NIL,NIL,NIL,SIG_IGN,SIG_IGN,SIG_IGN,SIG_IGN);
	syslog (LOG_INFO,"%s, while reading auth char user=%.80s host=%.80s",
		e,user ? user : "???",tcp_clienthost ());
	state = UPDATE;
	_exit (1);
      }
    }
    return NIL;
  }
  alarm (0);			/* make sure timeout disabled */
  if (t[-1] == '\015') --t;	/* remove CR */
  *t = '\0';			/* tie off buffer */
  return (resp[0] != '*') ?
    (char *) rfc822_base64 (resp,t-resp,rlen ? rlen : &i) : NIL;
}

/* Select mailbox
 * Accepts: mailbox name
 * Returns: new state
 */

int mbxopen (char *mailbox)
{
  unsigned long i,j;
  char tmp[TMPLEN];
  MESSAGECACHE *elt;
  nmsgs = 0;			/* no messages yet */
  if (msg) fs_give ((void **) &msg);
				/* open mailbox */
  if (stream = mail_open (stream,mailbox,NIL)) {
    if (!stream->rdonly) {	/* make sure not readonly */
      if (j = stream->nmsgs) {	/* if mailbox non-empty */
	sprintf (tmp,"1:%lu",j);/* fetch fast information for all messages */
	mail_fetch_fast (stream,tmp,NIL);
	msg = (long *) fs_get ((stream->nmsgs + 1) * sizeof (long));
	for (i = 1; i <= j; i++) if (!(elt = mail_elt (stream,i))->deleted) {
	  msg[++nmsgs] = i;	/* note the presence of this message */
	  if (elt->seen) il = last = nmsgs;
	}
      }
      sprintf (tmp,"+OK Mailbox open, %lu messages\015\012",nmsgs);
      PSOUT (tmp);
      return TRANSACTION;
    }
    else sayonara = "-ERR Can't get lock.  Mailbox in use\015\012";
  }
  else sayonara = "-ERR Unable to open user's INBOX\015\012";
  syslog (LOG_INFO,"Error opening or locking INBOX user=%.80s host=%.80s",
	  user,tcp_clienthost ());
  return UPDATE;
}

/* Blat a string with dot checking
 * Accepts: string
 *	    maximum number of lines if greater than zero
 *	    maximum number of bytes to output
 * Returns: number of lines output
 *
 * This routine is uglier and kludgier than it should be, just to be robust
 * in the case of a message which doesn't end in a newline.  Yes, this routine
 * does truncate the last two bytes from the text.  Since it is normally a
 * newline and the main routine adds it back, it usually does not make a
 * difference.  But if it isn't, since the newline is required and the octet
 * counts have to match, there's no choice but to truncate.
 */

long blat (char *text,long lines,unsigned long size)
{
  char c,d,e;
  long ret = 0;
				/* no-op if zero lines or empty string */
  if (!(lines && (size-- > 2))) return 0;
  c = *text++; d = *text++;	/* collect first two bytes */
  if (c == '.') PBOUT ('.');	/* double string-leading dot if necessary */
  while (lines && --size) {	/* copy loop */
    e = *text++;		/* get next byte */
    PBOUT (c);			/* output character */
    if (c == '\012') {		/* end of line? */
      ret++; --lines;		/* count another line */
				/* double leading dot as necessary */
      if (lines && size && (d == '.')) PBOUT ('.');
    }
    c = d; d = e;		/* move to next character */
  }
  return ret;
}


/* Reset mailbox
 */

void rset ()
{
  unsigned long i;
  char tmp[20];
  if (nmsgs) {			/* undelete and unmark all of our messages */
    for (i = 1; i <= nmsgs; i++) { /*  */
      if (msg[i] < 0) {		/* ugly and inefficient, but trustworthy */
	sprintf (tmp,"%ld",msg[i] = -msg[i]);
	mail_clearflag (stream,tmp,i <= il ? "\\Deleted" : "\\Deleted \\Seen");
      }
      else if (i > il) {
	sprintf (tmp,"%ld",msg[i]);
	mail_clearflag (stream,tmp,"\\Seen");
      }
    }
    last = il;
  }
  ndele = 0;			/* no more deleted messages */
}

/* 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)
{
  unsigned long i = number + 1;
  msg[number] = 0;		/* I bet that this will annoy someone */
  while (i <= nmsgs) --msg[i++];
}


/* Message flag status change
 * 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 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 = T;
}


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

void mm_nocritical (MAILSTREAM *stream)
{
  critical = NIL;
}


/* 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 */
}