Adding upstream version 4.99.4.upstream/4.99.4

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 198 insertions, 0 deletions

diff --git a/print-chdlc.c b/print-chdlc.c
new file mode 100644
index 0000000..235675d
--- /dev/null
+++ b/print-chdlc.c
@@ -0,0 +1,198 @@
+/*
+ * Copyright (c) 1990, 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.
+ */
+
+/* \summary: Cisco HDLC printer */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include "netdissect-stdinc.h"
+
+#include "netdissect.h"
+#include "addrtoname.h"
+#include "ethertype.h"
+#include "extract.h"
+#include "chdlc.h"
+#include "nlpid.h"
+
+static void chdlc_slarp_print(netdissect_options *, const u_char *, u_int);
+
+static const struct tok chdlc_cast_values[] = {
+    { CHDLC_UNICAST, "unicast" },
+    { CHDLC_BCAST, "bcast" },
+    { 0, NULL}
+};
+
+
+/* Standard CHDLC printer */
+void
+chdlc_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, const u_char *p)
+{
+	ndo->ndo_protocol = "chdlc";
+	ndo->ndo_ll_hdr_len += chdlc_print(ndo, p, h->len);
+}
+
+u_int
+chdlc_print(netdissect_options *ndo, const u_char *p, u_int length)
+{
+	u_int proto;
+	const u_char *bp = p;
+
+	ndo->ndo_protocol = "chdlc";
+	if (length < CHDLC_HDRLEN)
+		goto trunc;
+	proto = GET_BE_U_2(p + 2);
+	if (ndo->ndo_eflag) {
+                ND_PRINT("%s, ethertype %s (0x%04x), length %u: ",
+                       tok2str(chdlc_cast_values, "0x%02x", GET_U_1(p)),
+                       tok2str(ethertype_values, "Unknown", proto),
+                       proto,
+                       length);
+	}
+
+	length -= CHDLC_HDRLEN;
+	p += CHDLC_HDRLEN;
+
+	switch (proto) {
+	case ETHERTYPE_IP:
+		ip_print(ndo, p, length);
+		break;
+	case ETHERTYPE_IPV6:
+		ip6_print(ndo, p, length);
+		break;
+	case CHDLC_TYPE_SLARP:
+		chdlc_slarp_print(ndo, p, length);
+		break;
+        case ETHERTYPE_MPLS:
+        case ETHERTYPE_MPLS_MULTI:
+                mpls_print(ndo, p, length);
+		break;
+        case ETHERTYPE_ISO:
+                /* is the fudge byte set ? lets verify by spotting ISO headers */
+                if (length < 2)
+                    goto trunc;
+                if (GET_U_1(p + 1) == NLPID_CLNP ||
+                    GET_U_1(p + 1) == NLPID_ESIS ||
+                    GET_U_1(p + 1) == NLPID_ISIS)
+                    isoclns_print(ndo, p + 1, length - 1);
+                else
+                    isoclns_print(ndo, p, length);
+                break;
+	default:
+                if (!ndo->ndo_eflag)
+                        ND_PRINT("unknown CHDLC protocol (0x%04x)", proto);
+                break;
+	}
+
+	return (CHDLC_HDRLEN);
+
+trunc:
+	nd_print_trunc(ndo);
+	return (ND_BYTES_AVAILABLE_AFTER(bp));
+}
+
+/*
+ * The fixed-length portion of a SLARP packet.
+ */
+struct cisco_slarp {
+	nd_uint32_t code;
+#define SLARP_REQUEST	0
+#define SLARP_REPLY	1
+#define SLARP_KEEPALIVE	2
+	union {
+		struct {
+			uint8_t addr[4];
+			uint8_t mask[4];
+		} addr;
+		struct {
+			nd_uint32_t myseq;
+			nd_uint32_t yourseq;
+			nd_uint16_t rel;
+		} keep;
+	} un;
+};
+
+#define SLARP_MIN_LEN	14
+#define SLARP_MAX_LEN	18
+
+static void
+chdlc_slarp_print(netdissect_options *ndo, const u_char *cp, u_int length)
+{
+	const struct cisco_slarp *slarp;
+        u_int sec,min,hrs,days;
+
+	ndo->ndo_protocol = "chdlc_slarp";
+	ND_PRINT("SLARP (length: %u), ",length);
+	if (length < SLARP_MIN_LEN)
+		goto trunc;
+
+	slarp = (const struct cisco_slarp *)cp;
+	ND_TCHECK_LEN(slarp, SLARP_MIN_LEN);
+	switch (GET_BE_U_4(slarp->code)) {
+	case SLARP_REQUEST:
+		ND_PRINT("request");
+		/*
+		 * At least according to William "Chops" Westfield's
+		 * message in
+		 *
+		 *	https://web.archive.org/web/20190725151313/www.nethelp.no/net/cisco-hdlc.txt
+		 *
+		 * the address and mask aren't used in requests -
+		 * they're just zero.
+		 */
+		break;
+	case SLARP_REPLY:
+		ND_PRINT("reply %s/%s",
+			GET_IPADDR_STRING(slarp->un.addr.addr),
+			GET_IPADDR_STRING(slarp->un.addr.mask));
+		break;
+	case SLARP_KEEPALIVE:
+		ND_PRINT("keepalive: mineseen=0x%08x, yourseen=0x%08x, reliability=0x%04x",
+                       GET_BE_U_4(slarp->un.keep.myseq),
+                       GET_BE_U_4(slarp->un.keep.yourseq),
+                       GET_BE_U_2(slarp->un.keep.rel));
+
+                if (length >= SLARP_MAX_LEN) { /* uptime-stamp is optional */
+                        cp += SLARP_MIN_LEN;
+                        sec = GET_BE_U_4(cp) / 1000;
+                        min = sec / 60; sec -= min * 60;
+                        hrs = min / 60; min -= hrs * 60;
+                        days = hrs / 24; hrs -= days * 24;
+                        ND_PRINT(", link uptime=%ud%uh%um%us",days,hrs,min,sec);
+                }
+		break;
+	default:
+		ND_PRINT("0x%02x unknown", GET_BE_U_4(slarp->code));
+                if (ndo->ndo_vflag <= 1)
+                    print_unknown_data(ndo,cp+4,"\n\t",length-4);
+		break;
+	}
+
+	if (SLARP_MAX_LEN < length && ndo->ndo_vflag)
+		ND_PRINT(", (trailing junk: %u bytes)", length - SLARP_MAX_LEN);
+        if (ndo->ndo_vflag > 1)
+            print_unknown_data(ndo,cp+4,"\n\t",length-4);
+	return;
+
+trunc:
+	nd_print_trunc(ndo);
+}