421 lines
8.9 KiB
C
421 lines
8.9 KiB
C
/*
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* Copyright (c) 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that: (1) source code distributions
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* retain the above copyright notice and this paragraph in its entirety, (2)
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* distributions including binary code include the above copyright notice and
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* this paragraph in its entirety in the documentation or other materials
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* provided with the distribution, and (3) all advertising materials mentioning
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* features or use of this software display the following acknowledgement:
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* ``This product includes software developed by the University of California,
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* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
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* the University nor the names of its contributors may be used to endorse
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* or promote products derived from this software without specific prior
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* written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*
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* Name to id translation routines used by the scanner.
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* These functions are not time critical.
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*
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* $FreeBSD$
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*/
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#ifndef lint
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static const char rcsid[] =
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"@(#) $Header: /tcpdump/master/libpcap/nametoaddr.c,v 1.60 2001/07/28 22:56:35 guy Exp $ (LBL)";
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#endif
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <sys/param.h>
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#include <sys/types.h> /* concession to AIX */
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#include <sys/socket.h>
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#include <sys/time.h>
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struct mbuf;
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struct rtentry;
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#include <net/if.h>
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#include <netinet/in.h>
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#ifdef HAVE_NETINET_IF_ETHER_H
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#include <netinet/if_ether.h>
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#endif
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#include <arpa/inet.h>
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#ifdef INET6
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#include <netdb.h>
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#include <sys/socket.h>
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#endif /*INET6*/
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#include <ctype.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <memory.h>
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#include <netdb.h>
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#include <stdio.h>
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#include "pcap-int.h"
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#include "gencode.h"
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#include <pcap-namedb.h>
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#ifdef HAVE_OS_PROTO_H
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#include "os-proto.h"
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#endif
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#ifndef NTOHL
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#define NTOHL(x) (x) = ntohl(x)
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#define NTOHS(x) (x) = ntohs(x)
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#endif
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static inline int xdtoi(int);
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/*
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* Convert host name to internet address.
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* Return 0 upon failure.
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*/
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bpf_u_int32 **
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pcap_nametoaddr(const char *name)
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{
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#ifndef h_addr
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static bpf_u_int32 *hlist[2];
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#endif
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bpf_u_int32 **p;
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struct hostent *hp;
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if ((hp = gethostbyname(name)) != NULL) {
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#ifndef h_addr
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hlist[0] = (bpf_u_int32 *)hp->h_addr;
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NTOHL(hp->h_addr);
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return hlist;
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#else
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for (p = (bpf_u_int32 **)hp->h_addr_list; *p; ++p)
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NTOHL(**p);
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return (bpf_u_int32 **)hp->h_addr_list;
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#endif
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}
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else
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return 0;
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}
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#ifdef INET6
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struct addrinfo *
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pcap_nametoaddrinfo(const char *name)
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{
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struct addrinfo hints, *res;
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int error;
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memset(&hints, 0, sizeof(hints));
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hints.ai_family = PF_UNSPEC;
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hints.ai_socktype = SOCK_STREAM; /*not really*/
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error = getaddrinfo(name, NULL, &hints, &res);
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if (error)
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return NULL;
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else
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return res;
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}
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#endif /*INET6*/
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/*
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* Convert net name to internet address.
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* Return 0 upon failure.
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*/
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bpf_u_int32
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pcap_nametonetaddr(const char *name)
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{
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struct netent *np;
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if ((np = getnetbyname(name)) != NULL)
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return np->n_net;
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else
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return 0;
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}
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/*
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* Convert a port name to its port and protocol numbers.
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* We assume only TCP or UDP.
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* Return 0 upon failure.
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*/
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int
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pcap_nametoport(const char *name, int *port, int *proto)
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{
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struct servent *sp;
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char *other;
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sp = getservbyname(name, (char *)0);
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if (sp != NULL) {
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NTOHS(sp->s_port);
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*port = sp->s_port;
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*proto = pcap_nametoproto(sp->s_proto);
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/*
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* We need to check /etc/services for ambiguous entries.
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* If we find the ambiguous entry, and it has the
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* same port number, change the proto to PROTO_UNDEF
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* so both TCP and UDP will be checked.
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*/
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if (*proto == IPPROTO_TCP)
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other = "udp";
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else
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other = "tcp";
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sp = getservbyname(name, other);
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if (sp != 0) {
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NTOHS(sp->s_port);
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#ifdef notdef
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if (*port != sp->s_port)
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/* Can't handle ambiguous names that refer
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to different port numbers. */
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warning("ambiguous port %s in /etc/services",
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name);
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#endif
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*proto = PROTO_UNDEF;
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}
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return 1;
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}
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#if defined(ultrix) || defined(__osf__)
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/* Special hack in case NFS isn't in /etc/services */
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if (strcmp(name, "nfs") == 0) {
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*port = 2049;
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*proto = PROTO_UNDEF;
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return 1;
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}
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#endif
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return 0;
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}
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int
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pcap_nametoproto(const char *str)
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{
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struct protoent *p;
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p = getprotobyname(str);
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if (p != 0)
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return p->p_proto;
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else
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return PROTO_UNDEF;
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}
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#include "ethertype.h"
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struct eproto {
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char *s;
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u_short p;
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};
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/* Static data base of ether protocol types. */
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struct eproto eproto_db[] = {
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#if 0
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/* The FreeBSD elf linker generates a request to copy this array
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* (including its size) when you link with -lpcap. In order to
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* not bump the major version number of this libpcap.so, we need
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* to ensure that the array stays the same size. Since PUP is
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* likely never seen in real life any more, it's the first to
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* be sacrificed (in favor of ip6).
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*/
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{ "pup", ETHERTYPE_PUP },
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#endif
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{ "xns", ETHERTYPE_NS },
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{ "ip", ETHERTYPE_IP },
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#ifdef INET6
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{ "ip6", ETHERTYPE_IPV6 },
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#endif
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{ "arp", ETHERTYPE_ARP },
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{ "rarp", ETHERTYPE_REVARP },
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{ "sprite", ETHERTYPE_SPRITE },
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{ "mopdl", ETHERTYPE_MOPDL },
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{ "moprc", ETHERTYPE_MOPRC },
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{ "decnet", ETHERTYPE_DN },
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{ "lat", ETHERTYPE_LAT },
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{ "sca", ETHERTYPE_SCA },
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{ "lanbridge", ETHERTYPE_LANBRIDGE },
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{ "vexp", ETHERTYPE_VEXP },
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{ "vprod", ETHERTYPE_VPROD },
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{ "atalk", ETHERTYPE_ATALK },
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{ "atalkarp", ETHERTYPE_AARP },
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{ "loopback", ETHERTYPE_LOOPBACK },
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{ "decdts", ETHERTYPE_DECDTS },
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{ "decdns", ETHERTYPE_DECDNS },
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{ (char *)0, 0 }
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};
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int
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pcap_nametoeproto(const char *s)
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{
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struct eproto *p = eproto_db;
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while (p->s != 0) {
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if (strcmp(p->s, s) == 0)
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return p->p;
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p += 1;
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}
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return PROTO_UNDEF;
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}
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/* Hex digit to integer. */
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static inline int
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xdtoi(c)
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register int c;
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{
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if (isdigit(c))
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return c - '0';
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else if (islower(c))
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return c - 'a' + 10;
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else
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return c - 'A' + 10;
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}
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int
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__pcap_atoin(const char *s, bpf_u_int32 *addr)
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{
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u_int n;
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int len;
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*addr = 0;
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len = 0;
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while (1) {
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n = 0;
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while (*s && *s != '.')
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n = n * 10 + *s++ - '0';
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*addr <<= 8;
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*addr |= n & 0xff;
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len += 8;
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if (*s == '\0')
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return len;
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++s;
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}
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/* NOTREACHED */
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}
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int
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__pcap_atodn(const char *s, bpf_u_int32 *addr)
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{
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#define AREASHIFT 10
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#define AREAMASK 0176000
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#define NODEMASK 01777
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u_int node, area;
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if (sscanf((char *)s, "%d.%d", &area, &node) != 2)
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bpf_error("malformed decnet address '%s'", s);
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*addr = (area << AREASHIFT) & AREAMASK;
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*addr |= (node & NODEMASK);
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return(32);
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}
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/*
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* Convert 's' which has the form "xx:xx:xx:xx:xx:xx" into a new
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* ethernet address. Assumes 's' is well formed.
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*/
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u_char *
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pcap_ether_aton(const char *s)
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{
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register u_char *ep, *e;
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register u_int d;
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e = ep = (u_char *)malloc(6);
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while (*s) {
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if (*s == ':')
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s += 1;
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d = xdtoi(*s++);
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if (isxdigit((unsigned char)*s)) {
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d <<= 4;
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d |= xdtoi(*s++);
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}
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*ep++ = d;
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}
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return (e);
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}
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#ifndef HAVE_ETHER_HOSTTON
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/* Roll our own */
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u_char *
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pcap_ether_hostton(const char *name)
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{
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register struct pcap_etherent *ep;
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register u_char *ap;
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static FILE *fp = NULL;
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static int init = 0;
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if (!init) {
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fp = fopen(PCAP_ETHERS_FILE, "r");
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++init;
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if (fp == NULL)
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return (NULL);
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} else if (fp == NULL)
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return (NULL);
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else
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rewind(fp);
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while ((ep = pcap_next_etherent(fp)) != NULL) {
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if (strcmp(ep->name, name) == 0) {
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ap = (u_char *)malloc(6);
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if (ap != NULL) {
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memcpy(ap, ep->addr, 6);
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return (ap);
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}
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break;
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}
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}
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return (NULL);
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}
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#else
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/*
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* XXX - perhaps this should, instead, be declared in "lbl/os-XXX.h" files,
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* for those OS versions that don't declare it, rather than being declared
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* here? That way, for example, we could declare it on FreeBSD 2.x (which
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* doesn't declare it), but not on FreeBSD 3.x (which declares it like
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* this) or FreeBSD 4.x (which declares it with its first argument as
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* "const char *", so no matter how we declare it here, it'll fail to
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* compile on one of 3.x or 4.x).
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*/
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#if !defined(sgi) && !defined(__NetBSD__) && !defined(__FreeBSD__)
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extern int ether_hostton(char *, struct ether_addr *);
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#endif
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/* Use the os supplied routines */
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u_char *
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pcap_ether_hostton(const char *name)
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{
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register u_char *ap;
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u_char a[6];
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ap = NULL;
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if (ether_hostton((char *)name, (struct ether_addr *)a) == 0) {
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ap = (u_char *)malloc(6);
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if (ap != NULL)
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memcpy((char *)ap, (char *)a, 6);
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}
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return (ap);
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}
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#endif
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u_short
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__pcap_nametodnaddr(const char *name)
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{
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#ifdef DECNETLIB
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struct nodeent *getnodebyname();
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struct nodeent *nep;
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unsigned short res;
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nep = getnodebyname(name);
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if (nep == ((struct nodeent *)0))
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bpf_error("unknown decnet host name '%s'\n", name);
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memcpy((char *)&res, (char *)nep->n_addr, sizeof(unsigned short));
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return(res);
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#else
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bpf_error("decnet name support not included, '%s' cannot be translated\n",
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name);
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return(0);
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#endif
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}
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