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

   1 /*
   2  * Copyright (C) 1993-2005  by Darren Reed.
   3  * See the IPFILTER.LICENCE file for details on licencing.
   4  */
   5
   6 #include "ipf.h"
   7
   8 int getport(fr, name, port)
   9 frentry_t *fr;
  10 char *name;
  11 u_short *port;
  12 {
  13         struct protoent *p;
  14         struct servent *s;
  15         u_short p1;
  16
  17         if (fr == NULL || fr->fr_type != FR_T_IPF) {
  18                 s = getservbyname(name, NULL);
  19                 if (s != NULL) {
  20                         *port = s->s_port;
  21                         return 0;
  22                 }
  23                 return -1;
  24         }
  25
  26         if ((fr->fr_flx & FI_TCPUDP) != 0) {
  27                 /*
  28                  * If a rule is "tcp/udp" then check that both TCP and UDP
  29                  * mappings for this protocol name match ports.
  30                  */
  31                 s = getservbyname(name, "tcp");
  32                 if (s == NULL)
  33                         return -1;
  34                 p1 = s->s_port;
  35                 s = getservbyname(name, "udp");
  36                 if (s == NULL || s->s_port != p1)
  37                         return -1;
  38                 *port = p1;
  39                 return 0;
  40         }
  41
  42         p = getprotobynumber(fr->fr_proto);
  43         s = getservbyname(name, p ? p->p_name : NULL);
  44         if (s != NULL) {
  45                 *port = s->s_port;
  46                 return 0;
  47         }
  48         return -1;
  49 }