usr/src/cmd/ipf/lib/common/portname.c

   1 /*
   2  * Copyright (C) 1993-2001 by Darren Reed.
   3  *
   4  * See the IPFILTER.LICENCE file for details on licencing.
   5  *
   6  * $Id: portname.c,v 1.7 2003/08/14 14:27:43 darrenr Exp $
   7  */
   8 #include "ipf.h"
   9
  10
  11 char    *portname(pr, port)
  12 int     pr, port;
  13 {
  14         static  char    buf[32];
  15         struct  protoent        *p = NULL;
  16         struct  servent *sv = NULL, *sv1 = NULL;
  17
  18         if ((opts & OPT_NORESOLVE) == 0) {
  19                 if (pr == -1) {
  20                         if ((sv = getservbyport(htons(port), "tcp"))) {
  21                                 strncpy(buf, sv->s_name, sizeof(buf)-1);
  22                                 buf[sizeof(buf)-1] = '\0';
  23                                 sv1 = getservbyport(htons(port), "udp");
  24                                 sv = strncasecmp(buf, sv->s_name, strlen(buf)) ?
  25                                      NULL : sv1;
  26                         }
  27                         if (sv)
  28                                 return buf;
  29                 } else if ((pr != -2) && (p = getprotobynumber(pr))) {
  30                         if ((sv = getservbyport(htons(port), p->p_name))) {
  31                                 strncpy(buf, sv->s_name, sizeof(buf)-1);
  32                                 buf[sizeof(buf)-1] = '\0';
  33                                 return buf;
  34                         }
  35                 }
  36         }
  37
  38         (void) sprintf(buf, "%d", port);
  39         return buf;
  40 }