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/* $OpenBSD: print-null.c,v 1.25 2021/12/01 18:28:46 deraadt Exp $ */
/*
* Copyright (c) 1991, 1993, 1994, 1995, 1996, 1997
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that: (1) source code distributions
* retain the above copyright notice and this paragraph in its entirety, (2)
* distributions including binary code include the above copyright notice and
* this paragraph in its entirety in the documentation or other materials
* provided with the distribution, and (3) all advertising materials mentioning
* features or use of this software display the following acknowledgement:
* ``This product includes software developed by the University of California,
* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
* the University nor the names of its contributors may be used to endorse
* or promote products derived from this software without specific prior
* written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
#include <sys/time.h>
#include <sys/socket.h>
#include <sys/file.h>
#include <sys/ioctl.h>
#include <net/if.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <netinet/ip6.h>
#include <netinet/if_ether.h>
#include <netinet/ip_var.h>
#include <netinet/udp.h>
#include <netinet/udp_var.h>
#include <netinet/tcp.h>
#include <pcap.h>
#include <stdio.h>
#include <string.h>
#include "interface.h"
#include "addrtoname.h"
#ifndef AF_NS
#define AF_NS 6 /* XEROX NS protocols */
#endif
/*
* The DLT_NULL packet header is 4 bytes long. It contains a host
* order 32 bit integer that specifies the family, e.g. AF_INET
*/
#define NULL_HDRLEN 4
static void
null_print(const u_char *p, const struct ip *ip, u_int length)
{
u_int family;
memcpy((char *)&family, (char *)p, sizeof(family));
if (nflag && family != AF_LINK) {
/* XXX just dump the header */
return;
}
switch (family) {
case AF_INET:
printf("ip: ");
break;
case AF_INET6:
printf("ip6: ");
break;
case AF_NS:
printf("ns: ");
break;
#ifdef __OpenBSD__
case AF_LINK:
ether_print(p + NULL_HDRLEN, length);
break;
#endif
case AF_MPLS:
printf("mpls: ");
break;
default:
printf("AF %d: ", family);
break;
}
}
void
loop_if_print(u_char *user, const struct pcap_pkthdr *h, const u_char *p)
{
*(u_int *)p = ntohl(*(u_int *)p);
null_if_print(user, h, p);
}
void
null_if_print(u_char *user, const struct pcap_pkthdr *h, const u_char *p)
{
u_int length = h->len;
u_int caplen = h->caplen;
u_int family = *(u_int *)p;
#ifdef __OpenBSD__
struct ether_header *ep;
u_short ether_type;
extern u_short extracted_ethertype;
#endif
ts_print(&h->ts);
if (caplen < NULL_HDRLEN) {
printf("[|null]");
goto out;
}
/*
* Some printers want to get back at the link level addresses,
* and/or check that they're not walking off the end of the packet.
* Rather than pass them all the way down, we set these globals.
*/
packetp = p;
snapend = p + caplen;
length -= NULL_HDRLEN;
if (eflag)
null_print(p, (struct ip *)(p + NULL_HDRLEN), length);
switch (family) {
case AF_INET:
ip_print(p + NULL_HDRLEN, length);
break;
case AF_INET6:
ip6_print(p + NULL_HDRLEN, length);
break;
case AF_MPLS:
mpls_print(p + NULL_HDRLEN, length);
break;
#ifdef __OpenBSD__
case AF_LINK:
if (caplen < sizeof(struct ether_header) + NULL_HDRLEN) {
printf("[|ether]");
goto out;
}
length -= sizeof(struct ether_header);
caplen -= sizeof(struct ether_header);
ep = (struct ether_header *)(p + NULL_HDRLEN);
p += NULL_HDRLEN + sizeof(struct ether_header);
packetp += sizeof(struct ether_header);
ether_type = ntohs(ep->ether_type);
extracted_ethertype = 0;
if (ether_type <= ETHERMTU) {
/* Try to print the LLC-layer header & higher layers */
if (llc_print(p, length, caplen, ESRC(ep),
EDST(ep)) == 0) {
/* ether_type not known, print raw packet */
if (!eflag)
ether_print((u_char *)ep, length);
if (extracted_ethertype) {
printf("(LLC %s) ",
etherproto_string(htons(extracted_ethertype)));
}
if (!xflag && !qflag)
default_print(p, caplen - NULL_HDRLEN);
}
} else if (ether_encap_print(ether_type, p, length,
caplen) == 0) {
/* ether_type not known, print raw packet */
if (!eflag)
ether_print((u_char *)ep, length +
sizeof(*ep));
if (!xflag && !qflag)
default_print(p, caplen - NULL_HDRLEN);
}
break;
#endif /* __OpenBSD__ */
}
if (xflag)
default_print((const u_char *)(packetp + NULL_HDRLEN),
caplen - NULL_HDRLEN);
out:
putchar('\n');
}
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