/*
 * Copyright (C) 1993-2005  by Darren Reed.
 * See the IPFILTER.LICENCE file for details on licencing.
 */

#include "ipf.h"

int getport(fr, name, port)
frentry_t *fr;
char *name;
u_short *port;
{
        struct protoent *p;
        struct servent *s;
        u_short p1;

        if (fr == NULL || fr->fr_type != FR_T_IPF) {
                s = getservbyname(name, NULL);
                if (s != NULL) {
                        *port = s->s_port;
                        return 0;
                }
                return -1;
        }

        if ((fr->fr_flx & FI_TCPUDP) != 0) {
                /*
                 * If a rule is "tcp/udp" then check that both TCP and UDP
                 * mappings for this protocol name match ports.
                 */
                s = getservbyname(name, "tcp");
                if (s == NULL)
                        return -1;
                p1 = s->s_port;
                s = getservbyname(name, "udp");
                if (s == NULL || s->s_port != p1)
                        return -1;
                *port = p1;
                return 0;
        }

        p = getprotobynumber(fr->fr_proto);
        s = getservbyname(name, p ? p->p_name : NULL);
        if (s != NULL) {
                *port = s->s_port;
                return 0;
        }
        return -1;
}