contrib/ipfilter/lib/getport.c

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