mirror of
https://github.com/the-tcpdump-group/tcpdump.git
synced 2024-11-23 18:14:29 +08:00
133 lines
3.0 KiB
C
133 lines
3.0 KiB
C
#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <tcpdump-stdinc.h>
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#include <stdio.h>
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#include <pcap.h>
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#include "netdissect.h"
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#include "addrtoname.h"
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#include "ipnet.h"
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#ifdef DLT_IPNET
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int ipnet_encap_print(netdissect_options *,u_short, const u_char *, u_int, u_int);
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const struct tok ipnet_values[] = {
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{ IPH_AF_INET, "IPv4" },
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{ IPH_AF_INET6, "IPv6" },
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{ 0, NULL }
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};
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static inline void
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ipnet_hdr_print(struct netdissect_options *ndo, const u_char *bp, u_int length)
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{
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const ipnet_hdr_t *hdr;
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hdr = (const ipnet_hdr_t *)bp;
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ND_PRINT((ndo, "%d > %d", hdr->iph_zsrc, hdr->iph_zdst));
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if (!ndo->ndo_qflag) {
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ND_PRINT((ndo,", family %s (%d)",
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tok2str(ipnet_values, "Unknown",
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hdr->iph_family),
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hdr->iph_family));
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} else {
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ND_PRINT((ndo,", %s",
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tok2str(ipnet_values,
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"Unknown Ethertype (0x%04x)",
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hdr->iph_family)));
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}
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ND_PRINT((ndo, ", length %u: ", length));
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}
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void
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ipnet_print(struct netdissect_options *ndo, const u_char *p, u_int length, u_int caplen)
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{
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ipnet_hdr_t *hdr;
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if (caplen < sizeof(ipnet_hdr_t)) {
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ND_PRINT((ndo, "[|ipnet]"));
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return;
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}
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if (ndo->ndo_eflag)
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ipnet_hdr_print(ndo, p, length);
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length -= sizeof(ipnet_hdr_t);
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caplen -= sizeof(ipnet_hdr_t);
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hdr = (ipnet_hdr_t *)p;
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p += sizeof(ipnet_hdr_t);
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if (ipnet_encap_print(ndo, hdr->iph_family, p, length, caplen) == 0) {
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if (!ndo->ndo_eflag)
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ipnet_hdr_print(ndo, (u_char *)hdr,
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length + sizeof(ipnet_hdr_t));
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if (!ndo->ndo_suppress_default_print)
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ndo->ndo_default_print(ndo, p, caplen);
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}
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}
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/*
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* This is the top level routine of the printer. 'p' points
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* to the ether header of the packet, 'h->ts' is the timestamp,
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* 'h->len' is the length of the packet off the wire, and 'h->caplen'
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* is the number of bytes actually captured.
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*/
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u_int
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ipnet_if_print(struct netdissect_options *ndo, const struct pcap_pkthdr *h, const u_char *p)
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{
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ipnet_print(ndo, p, h->len, h->caplen);
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return (sizeof(ipnet_hdr_t));
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}
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/*
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* Prints the packet encapsulated in an Ethernet data segment
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* (or an equivalent encapsulation), given the Ethernet type code.
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*
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* Returns non-zero if it can do so, zero if the ethertype is unknown.
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*
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* The Ethernet type code is passed through a pointer; if it was
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* ETHERTYPE_8021Q, it gets updated to be the Ethernet type of
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* the 802.1Q payload, for the benefit of lower layers that might
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* want to know what it is.
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*/
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int
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ipnet_encap_print(struct netdissect_options *ndo, u_short family, const u_char *p,
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u_int length, u_int caplen)
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{
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recurse:
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switch (family) {
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case IPH_AF_INET:
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ip_print(ndo, p, length);
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return (1);
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#ifdef INET6
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case IPH_AF_INET6:
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ip6_print(p, length);
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return (1);
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#endif /*INET6*/
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default:
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return(0);
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}
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}
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/*
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* Local Variables:
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* c-style: whitesmith
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* c-basic-offset: 8
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* End:
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*/
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#endif /* DLT_IPNET */
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