82 lines
1.7 KiB
C
82 lines
1.7 KiB
C
/* $NetBSD: getport.c,v 1.6 2007/04/14 20:34:24 martin Exp $ */
|
|
|
|
/*
|
|
* Copyright (C) 2002-2005 by Darren Reed.
|
|
*
|
|
* See the IPFILTER.LICENCE file for details on licencing.
|
|
*
|
|
* Id: getport.c,v 1.1.4.6 2006/06/16 17:21:00 darrenr Exp
|
|
*/
|
|
|
|
#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;
|
|
}
|
|
|
|
/*
|
|
* Some people will use port names in rules without specifying
|
|
* either TCP or UDP because it is implied by the group head.
|
|
* If we don't know the protocol, then the best we can do here is
|
|
* to take either only the TCP or UDP mapping (if one or the other
|
|
* is missing) or make sure both of them agree.
|
|
*/
|
|
if (fr->fr_proto == 0) {
|
|
s = getservbyname(name, "tcp");
|
|
if (s != NULL)
|
|
p1 = s->s_port;
|
|
else
|
|
p1 = 0;
|
|
s = getservbyname(name, "udp");
|
|
if (s != NULL) {
|
|
if (p1 != s->s_port)
|
|
return -1;
|
|
}
|
|
if ((p1 == 0) && (s == NULL))
|
|
return -1;
|
|
if (p1)
|
|
*port = p1;
|
|
else
|
|
*port = s->s_port;
|
|
return 0;
|
|
}
|
|
|
|
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;
|
|
}
|