/* $NetBSD: getport.c,v 1.2 2012/07/22 14:27:36 darrenr Exp $ */ /* * Copyright (C) 2012 by Darren Reed. * * See the IPFILTER.LICENCE file for details on licencing. * * Id: getport.c,v 1.1.1.2 2012/07/22 13:44:38 darrenr Exp $ */ #include "ipf.h" #include int getport(fr, name, port, proto) frentry_t *fr; char *name, *proto; u_short *port; { struct protoent *p; struct servent *s; u_short p1; if (fr == NULL || fr->fr_type != FR_T_IPF) { s = getservbyname(name, proto); if (s != NULL) { *port = s->s_port; return 0; } if (ISDIGIT(*name)) { int portval = atoi(name); if (portval < 0 || portval > 65535) return -1; *port = htons((u_short)portval); 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; }