bfc88dcbf7
Approved by: glebius (mentor) BSD Licensed by: Darren Reed <darrenr@reed.wattle.id.au> (author)
91 lines
1.7 KiB
C
91 lines
1.7 KiB
C
/* $FreeBSD$ */
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/*
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* Copyright (C) 2012 by Darren Reed.
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*
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* See the IPFILTER.LICENCE file for details on licencing.
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*
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* $Id$
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*/
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#include "ipf.h"
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#include <ctype.h>
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int getport(fr, name, port, proto)
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frentry_t *fr;
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char *name, *proto;
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u_short *port;
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{
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struct protoent *p;
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struct servent *s;
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u_short p1;
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if (fr == NULL || fr->fr_type != FR_T_IPF) {
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s = getservbyname(name, proto);
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if (s != NULL) {
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*port = s->s_port;
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return 0;
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}
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if (ISDIGIT(*name)) {
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int portval = atoi(name);
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if (portval < 0 || portval > 65535)
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return -1;
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*port = htons((u_short)portval);
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return 0;
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}
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return -1;
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}
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/*
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* Some people will use port names in rules without specifying
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* either TCP or UDP because it is implied by the group head.
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* If we don't know the protocol, then the best we can do here is
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* to take either only the TCP or UDP mapping (if one or the other
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* is missing) or make sure both of them agree.
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*/
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if (fr->fr_proto == 0) {
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s = getservbyname(name, "tcp");
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if (s != NULL)
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p1 = s->s_port;
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else
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p1 = 0;
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s = getservbyname(name, "udp");
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if (s != NULL) {
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if (p1 != s->s_port)
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return -1;
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}
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if ((p1 == 0) && (s == NULL))
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return -1;
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if (p1)
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*port = p1;
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else
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*port = s->s_port;
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return 0;
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}
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if ((fr->fr_flx & FI_TCPUDP) != 0) {
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/*
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* If a rule is "tcp/udp" then check that both TCP and UDP
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* mappings for this protocol name match ports.
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*/
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s = getservbyname(name, "tcp");
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if (s == NULL)
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return -1;
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p1 = s->s_port;
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s = getservbyname(name, "udp");
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if (s == NULL || s->s_port != p1)
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return -1;
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*port = p1;
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return 0;
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}
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p = getprotobynumber(fr->fr_proto);
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s = getservbyname(name, p ? p->p_name : NULL);
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if (s != NULL) {
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*port = s->s_port;
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return 0;
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}
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return -1;
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}
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