* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
-#ifndef lint
-static const char rcsid[] =
- "@(#) $Header: /tcpdump/master/tcpdump/print-null.c,v 1.25 1999-10-17 21:37:14 mcr Exp $ (LBL)";
-#endif
-
-#include <sys/param.h>
-#include <sys/time.h>
-#include <sys/socket.h>
-#include <sys/file.h>
-#include <sys/ioctl.h>
-
-#if __STDC__
-struct mbuf;
-struct rtentry;
-#endif
-#include <net/if.h>
-
-#include <netinet/in.h>
-#include <netinet/in_systm.h>
-#include <netinet/ip.h>
-#include <netinet/if_ether.h>
-#include <netinet/udp.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
+/* \summary: BSD loopback device printer */
+
+#include <config.h>
+
+#include "netdissect-stdinc.h"
+
+#define ND_LONGJMP_FROM_TCHECK
+#include "netdissect.h"
+#include "extract.h"
+#include "af.h"
+
/*
- * The DLT_NULL packet header is 4 bytes long. It contains a network
- * order 32 bit integer that specifies the family, e.g. AF_INET
+ * The DLT_NULL packet header is 4 bytes long. It contains a host-byte-order
+ * 32-bit integer that specifies the family, e.g. AF_INET.
+ *
+ * Note here that "host" refers to the host on which the packets were
+ * captured; that isn't necessarily *this* host.
+ *
+ * The OpenBSD DLT_LOOP packet header is the same, except that the integer
+ * is in network byte order.
*/
#define NULL_HDRLEN 4
+/*
+ * Byte-swap a 32-bit number.
+ * ("htonl()" or "ntohl()" won't work - we want to byte-swap even on
+ * big-endian platforms.)
+ */
+#define SWAPLONG(y) \
+((((y)&0xff)<<24) | (((y)&0xff00)<<8) | (((y)&0xff0000)>>8) | (((y)>>24)&0xff))
+
static void
-null_print(const u_char *p, const struct ip *ip, u_int length)
+null_hdr_print(netdissect_options *ndo, uint32_t family, u_int length)
{
- u_int family;
-
- memcpy((char *)&family, (char *)p, sizeof(family));
-
- if (nflag) {
- /* XXX just dump the header */
- return;
+ if (!ndo->ndo_qflag) {
+ ND_PRINT("AF %s (%u)",
+ tok2str(bsd_af_values,"Unknown",family),family);
+ } else {
+ ND_PRINT("%s",
+ tok2str(bsd_af_values,"Unknown AF %u",family));
}
- switch (family) {
-
- case AF_INET:
- printf("ip: ");
- break;
- case AF_NS:
- printf("ns: ");
- break;
-
- default:
- printf("AF %d: ", family);
- break;
- }
+ ND_PRINT(", length %u: ", length);
}
+/*
+ * This is the top level routine of the printer. 'p' points
+ * to the ether header of the packet, 'h->ts' is the timestamp,
+ * 'h->len' is the length of the packet off the wire, and 'h->caplen'
+ * is the number of bytes actually captured.
+ */
void
-null_if_print(u_char *user, const struct pcap_pkthdr *h, const u_char *p)
+null_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, const u_char *p)
{
u_int length = h->len;
u_int caplen = h->caplen;
- const struct ip *ip;
+ uint32_t family;
- ts_print(&h->ts);
+ ndo->ndo_protocol = "null";
+ ND_TCHECK_LEN(p, NULL_HDRLEN);
+ ndo->ndo_ll_hdr_len += NULL_HDRLEN;
+
+ family = GET_HE_U_4(p);
/*
- * 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.
+ * This isn't necessarily in our host byte order; if this is
+ * a DLT_LOOP capture, it's in network byte order, and if
+ * this is a DLT_NULL capture from a machine with the opposite
+ * byte-order, it's in the opposite byte order from ours.
+ *
+ * If the upper 16 bits aren't all zero, assume it's byte-swapped.
*/
- packetp = p;
- snapend = p + caplen;
+ if ((family & 0xFFFF0000) != 0)
+ family = SWAPLONG(family);
+
+ if (ndo->ndo_eflag)
+ null_hdr_print(ndo, family, length);
length -= NULL_HDRLEN;
+ caplen -= NULL_HDRLEN;
+ p += NULL_HDRLEN;
- ip = (struct ip *)(p + NULL_HDRLEN);
+ switch (family) {
- if (eflag)
- null_print(p, ip, length);
+ case BSD_AF_INET:
+ ip_print(ndo, p, length);
+ break;
- ip_print((const u_char *)ip, length);
+ case BSD_AF_INET6_BSD:
+ case BSD_AF_INET6_FREEBSD:
+ case BSD_AF_INET6_DARWIN:
+ ip6_print(ndo, p, length);
+ break;
- if (xflag)
- default_print((const u_char *)ip, caplen - NULL_HDRLEN);
- putchar('\n');
-}
+ case BSD_AF_ISO:
+ isoclns_print(ndo, p, length);
+ break;
+
+ case BSD_AF_APPLETALK:
+ atalk_print(ndo, p, length);
+ break;
+
+ case BSD_AF_IPX:
+ ipx_print(ndo, p, length);
+ break;
+ default:
+ /* unknown AF_ value */
+ if (!ndo->ndo_eflag)
+ null_hdr_print(ndo, family, length + NULL_HDRLEN);
+ if (!ndo->ndo_suppress_default_print)
+ ND_DEFAULTPRINT(p, caplen);
+ }
+}
projects / tcpdump / blobdiff