X-Git-Url: https://git.tcpdump.org/tcpdump/blobdiff_plain/cfabfb053b4bf5b50f4d98d59053e1cc97ff5014..refs/pull/1034/head:/print-null.c

diff --git a/print-null.c b/print-null.c
index 064408a0..a1b03f86 100644
--- a/print-null.c
+++ b/print-null.c
@@ -19,32 +19,19 @@
  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  */
 
-#ifndef lint
-static const char rcsid[] =
-    "@(#) $Header: /tcpdump/master/tcpdump/print-null.c,v 1.46 2002-12-18 09:41:16 guy Exp $ (LBL)";
-#endif
+/* \summary: BSD loopback device printer */
 
 #ifdef HAVE_CONFIG_H
-#include "config.h"
+#include <config.h>
 #endif
 
-#include <tcpdump-stdinc.h>
-
-#include <pcap.h>
-#include <stdio.h>
-#include <string.h>
+#include "netdissect-stdinc.h"
 
-#include "interface.h"
-#include "addrtoname.h"
+#define ND_LONGJMP_FROM_TCHECK
+#include "netdissect.h"
+#include "extract.h"
+#include "af.h"
 
-#include "ip.h"
-#ifdef INET6
-#include "ip6.h"
-#endif
-
-#ifndef AF_NS
-#define AF_NS		6		/* XEROX NS protocols */
-#endif
 
 /*
  * The DLT_NULL packet header is 4 bytes long. It contains a host-byte-order
@@ -58,36 +45,6 @@ static const char rcsid[] =
  */
 #define	NULL_HDRLEN 4
 
-static void
-null_print(u_int family, u_int length)
-{
-	if (nflag)
-		printf("AF %u ", family);
-	else {
-		switch (family) {
-
-		case AF_INET:
-			printf("ip ");
-			break;
-
-#ifdef INET6
-		case AF_INET6:
-			printf("ip6 ");
-			break;
-#endif
-
-		case AF_NS:
-			printf("ns ");
-			break;
-
-		default:
-			printf("AF %u ", family);
-			break;
-		}
-	}
-	printf("%d: ", length);
-}
-
 /*
  * Byte-swap a 32-bit number.
  * ("htonl()" or "ntohl()" won't work - we want to byte-swap even on
@@ -96,18 +53,38 @@ null_print(u_int family, u_int length)
 #define	SWAPLONG(y) \
 ((((y)&0xff)<<24) | (((y)&0xff00)<<8) | (((y)&0xff0000)>>8) | (((y)>>24)&0xff))
 
+static void
+null_hdr_print(netdissect_options *ndo, uint32_t family, u_int length)
+{
+	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));
+	}
+
+	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 _U_, 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;
-	u_int family;
+	uint32_t family;
 
-	++infodelay;
-	ts_print(&h->ts);
+	ndo->ndo_protocol = "null";
+	ND_TCHECK_LEN(p, NULL_HDRLEN);
+	ndo->ndo_ll_hdr_len += NULL_HDRLEN;
 
-	memcpy((char *)&family, (char *)p, sizeof(family));
+	family = GET_HE_U_4(p);
 
 	/*
 	 * This isn't necessarily in our host byte order; if this is
@@ -120,39 +97,42 @@ null_if_print(u_char *user _U_, const struct pcap_pkthdr *h, const u_char *p)
 	if ((family & 0xFFFF0000) != 0)
 		family = SWAPLONG(family);
 
-	/*
-	 * Some printers want to check that they're not walking off the
-	 * end of the packet.
-	 * Rather than pass it all the way down, we set this global.
-	 */
-	snapend = p + caplen;
+	if (ndo->ndo_eflag)
+		null_hdr_print(ndo, family, length);
 
 	length -= NULL_HDRLEN;
+	caplen -= NULL_HDRLEN;
+	p += NULL_HDRLEN;
+
+	switch (family) {
+
+	case BSD_AFNUM_INET:
+		ip_print(ndo, p, length);
+		break;
 
-	ip = (struct ip *)(p + NULL_HDRLEN);
+	case BSD_AFNUM_INET6_BSD:
+	case BSD_AFNUM_INET6_FREEBSD:
+	case BSD_AFNUM_INET6_DARWIN:
+		ip6_print(ndo, p, length);
+		break;
 
-	if (eflag)
-		null_print(family, length);
+	case BSD_AFNUM_ISO:
+		isoclns_print(ndo, p, length);
+		break;
 
-	switch (IP_V(ip)) {
-	case 4:
-		ip_print((const u_char *)ip, length);
+	case BSD_AFNUM_APPLETALK:
+		atalk_print(ndo, p, length);
 		break;
-#ifdef INET6
-	case 6:
-		ip6_print((const u_char *)ip, length);
+
+	case BSD_AFNUM_IPX:
+		ipx_print(ndo, p, length);
 		break;
-#endif /* INET6 */
+
 	default:
-		printf("ip v%d", IP_V(ip));
-		break;
+		/* 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);
 	}
-
-	if (xflag)
-		default_print_packet(p, caplen, NULL_HDRLEN);
-	putchar('\n');
-	--infodelay;
-	if (infoprint)
-		info(0);
 }
-