tcpdump/print-udp.c

/*
 * Copyright (c) 1988, 1989, 1990, 1991, 1992, 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.
 */

#ifndef lint
static const char rcsid[] =
    "@(#) $Header: /tcpdump/master/tcpdump/print-udp.c,v 1.79 2000-09-23 08:54:42 guy Exp $ (LBL)";
#endif

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <sys/param.h>
#include <sys/time.h>
#include <sys/socket.h>

#include <netinet/in.h>
#include <netinet/in_systm.h>

#ifdef SEGSIZE
#undef SEGSIZE
#endif
#include <arpa/tftp.h>

#include <rpc/rpc.h>

#include <stdio.h>

#ifdef INET6
#include <netinet/ip6.h>
#endif

#include "interface.h"
#include "addrtoname.h"
#include "appletalk.h"

#include "udp.h"

#include "ip.h"

#ifdef NOERROR
#undef NOERROR					/* Solaris sucks */
#endif
#ifdef T_UNSPEC
#undef T_UNSPEC					/* SINIX does too */
#endif
#include "nameser.h"
#include "nfs.h"
#include "bootp.h"

struct rtcphdr {
	u_int16_t rh_flags;	/* T:2 P:1 CNT:5 PT:8 */
	u_int16_t rh_len;	/* length of message (in words) */
	u_int32_t rh_ssrc;	/* synchronization src id */
};

typedef struct {
	u_int32_t upper;	/* more significant 32 bits */
	u_int32_t lower;	/* less significant 32 bits */
} ntp64;

/*
 * Sender report.
 */
struct rtcp_sr {
	ntp64 sr_ntp;		/* 64-bit ntp timestamp */
	u_int32_t sr_ts;	/* reference media timestamp */
	u_int32_t sr_np;	/* no. packets sent */
	u_int32_t sr_nb;	/* no. bytes sent */
};

/*
 * Receiver report.
 * Time stamps are middle 32-bits of ntp timestamp.
 */
struct rtcp_rr {
	u_int32_t rr_srcid;	/* sender being reported */
	u_int32_t rr_nl;	/* no. packets lost */
	u_int32_t rr_ls;	/* extended last seq number received */
	u_int32_t rr_dv;	/* jitter (delay variance) */
	u_int32_t rr_lsr;	/* orig. ts from last rr from this src  */
	u_int32_t rr_dlsr;	/* time from recpt of last rr to xmit time */
};

/*XXX*/
#define RTCP_PT_SR	200
#define RTCP_PT_RR	201
#define RTCP_PT_SDES	202
#define 	RTCP_SDES_CNAME	1
#define 	RTCP_SDES_NAME	2
#define 	RTCP_SDES_EMAIL	3
#define 	RTCP_SDES_PHONE	4
#define 	RTCP_SDES_LOC	5
#define 	RTCP_SDES_TOOL	6
#define 	RTCP_SDES_NOTE	7
#define 	RTCP_SDES_PRIV	8
#define RTCP_PT_BYE	203
#define RTCP_PT_APP	204

static void
vat_print(const void *hdr, u_int len, register const struct udphdr *up)
{
	/* vat/vt audio */
	u_int ts = *(u_int16_t *)hdr;
	if ((ts & 0xf060) != 0) {
		/* probably vt */
		(void)printf(" udp/vt %u %d / %d",
			     (u_int32_t)(ntohs(up->uh_ulen) - sizeof(*up)),
			     ts & 0x3ff, ts >> 10);
	} else {
		/* probably vat */
		u_int32_t i0 = (u_int32_t)ntohl(((u_int *)hdr)[0]);
		u_int32_t i1 = (u_int32_t)ntohl(((u_int *)hdr)[1]);
		printf(" udp/vat %u c%d %u%s",
			(u_int32_t)(ntohs(up->uh_ulen) - sizeof(*up) - 8),
			i0 & 0xffff,
			i1, i0 & 0x800000? "*" : "");
		/* audio format */
		if (i0 & 0x1f0000)
			printf(" f%d", (i0 >> 16) & 0x1f);
		if (i0 & 0x3f000000)
			printf(" s%d", (i0 >> 24) & 0x3f);
	}
}

static void
rtp_print(const void *hdr, u_int len, register const struct udphdr *up)
{
	/* rtp v1 or v2 */
	u_int *ip = (u_int *)hdr;
	u_int hasopt, hasext, contype, hasmarker;
	u_int32_t i0 = (u_int32_t)ntohl(((u_int *)hdr)[0]);
	u_int32_t i1 = (u_int32_t)ntohl(((u_int *)hdr)[1]);
	u_int dlen = ntohs(up->uh_ulen) - sizeof(*up) - 8;
	const char * ptype;

	ip += 2;
	len >>= 2;
	len -= 2;
	hasopt = 0;
	hasext = 0;
	if ((i0 >> 30) == 1) {
		/* rtp v1 */
		hasopt = i0 & 0x800000;
		contype = (i0 >> 16) & 0x3f;
		hasmarker = i0 & 0x400000;
		ptype = "rtpv1";
	} else {
		/* rtp v2 */
		hasext = i0 & 0x10000000;
		contype = (i0 >> 16) & 0x7f;
		hasmarker = i0 & 0x800000;
		dlen -= 4;
		ptype = "rtp";
		ip += 1;
		len -= 1;
	}
	printf(" udp/%s %d c%d %s%s %d %u",
		ptype,
		dlen,
		contype,
		(hasopt || hasext)? "+" : "",
		hasmarker? "*" : "",
		i0 & 0xffff,
		i1);
	if (vflag) {
		printf(" %u", (u_int32_t)ntohl(((u_int *)hdr)[2]));
		if (hasopt) {
			u_int i2, optlen;
			do {
				i2 = ip[0];
				optlen = (i2 >> 16) & 0xff;
				if (optlen == 0 || optlen > len) {
					printf(" !opt");
					return;
				}
				ip += optlen;
				len -= optlen;
			} while ((int)i2 >= 0);
		}
		if (hasext) {
			u_int i2, extlen;
			i2 = ip[0];
			extlen = (i2 & 0xffff) + 1;
			if (extlen > len) {
				printf(" !ext");
				return;
			}
			ip += extlen;
		}
		if (contype == 0x1f) /*XXX H.261 */
			printf(" 0x%04x", ip[0] >> 16);
	}
}

static const u_char *
rtcp_print(const u_char *hdr, const u_char *ep)
{
	/* rtp v2 control (rtcp) */
	struct rtcp_rr *rr = 0;
	struct rtcp_sr *sr;
	struct rtcphdr *rh = (struct rtcphdr *)hdr;
	u_int len;
	u_int16_t flags;
	int cnt;
	double ts, dts;
	if ((u_char *)(rh + 1) > ep) {
		printf(" [|rtcp]");
		return (ep);
	}
	len = (ntohs(rh->rh_len) + 1) * 4;
	flags = ntohs(rh->rh_flags);
	cnt = (flags >> 8) & 0x1f;
	switch (flags & 0xff) {
	case RTCP_PT_SR:
		sr = (struct rtcp_sr *)(rh + 1);
		printf(" sr");
		if (len != cnt * sizeof(*rr) + sizeof(*sr) + sizeof(*rh))
			printf(" [%d]", len);
		if (vflag)
			printf(" %u", (u_int32_t)ntohl(rh->rh_ssrc));
		if ((u_char *)(sr + 1) > ep) {
			printf(" [|rtcp]");
			return (ep);
		}
		ts = (double)((u_int32_t)ntohl(sr->sr_ntp.upper)) +
		    ((double)((u_int32_t)ntohl(sr->sr_ntp.lower)) /
		    4294967296.0);
		printf(" @%.2f %u %up %ub", ts, (u_int32_t)ntohl(sr->sr_ts),
		    (u_int32_t)ntohl(sr->sr_np), (u_int32_t)ntohl(sr->sr_nb));
		rr = (struct rtcp_rr *)(sr + 1);
		break;
	case RTCP_PT_RR:
		printf(" rr");
		if (len != cnt * sizeof(*rr) + sizeof(*rh))
			printf(" [%d]", len);
		rr = (struct rtcp_rr *)(rh + 1);
		if (vflag)
			printf(" %u", (u_int32_t)ntohl(rh->rh_ssrc));
		break;
	case RTCP_PT_SDES:
		printf(" sdes %d", len);
		if (vflag)
			printf(" %u", (u_int32_t)ntohl(rh->rh_ssrc));
		cnt = 0;
		break;
	case RTCP_PT_BYE:
		printf(" bye %d", len);
		if (vflag)
			printf(" %u", (u_int32_t)ntohl(rh->rh_ssrc));
		cnt = 0;
		break;
	default:
		printf(" type-0x%x %d", flags & 0xff, len);
		cnt = 0;
		break;
	}
	if (cnt > 1)
		printf(" c%d", cnt);
	while (--cnt >= 0) {
		if ((u_char *)(rr + 1) > ep) {
			printf(" [|rtcp]");
			return (ep);
		}
		if (vflag)
			printf(" %u", (u_int32_t)ntohl(rr->rr_srcid));
		ts = (double)((u_int32_t)ntohl(rr->rr_lsr)) / 65536.;
		dts = (double)((u_int32_t)ntohl(rr->rr_dlsr)) / 65536.;
		printf(" %ul %us %uj @%.2f+%.2f",
		    (u_int32_t)ntohl(rr->rr_nl) & 0x00ffffff,
		    (u_int32_t)ntohl(rr->rr_ls),
		    (u_int32_t)ntohl(rr->rr_dv), ts, dts);
	}
	return (hdr + len);
}

static int udp_cksum(register const struct ip *ip,
		     register const struct udphdr *up,
		     register int len)
{
	int i, tlen;
	union phu {
		struct phdr {
			u_int32_t src;
			u_int32_t dst;
			u_char mbz;
			u_char proto;
			u_int16_t len;
		} ph;
		u_int16_t pa[6];
	} phu;
	register const u_int16_t *sp;
	u_int32_t sum;
	tlen = ntohs(ip->ip_len) - ((const char *)up-(const char*)ip);

	/* pseudo-header.. */
	phu.ph.len = htons(tlen);
	phu.ph.mbz = 0;
	phu.ph.proto = IPPROTO_UDP;
	memcpy(&phu.ph.src, &ip->ip_src.s_addr, sizeof(u_int32_t));
	memcpy(&phu.ph.dst, &ip->ip_dst.s_addr, sizeof(u_int32_t));

	sp = &phu.pa[0];
	sum = sp[0]+sp[1]+sp[2]+sp[3]+sp[4]+sp[5];

	sp = (const u_int16_t *)up;

	for (i=0; i<(tlen&~1); i+= 2)
		sum += *sp++;

	if (tlen & 1) {
		sum += htons( (*(const char *)sp) << 8);
	}

	while (sum > 0xffff)
		sum = (sum & 0xffff) + (sum >> 16);
	sum = ~sum & 0xffff;

	return (sum);
}

#ifdef INET6
static int udp6_cksum(const struct ip6_hdr *ip6, const struct udphdr *up,
	int len)
{
	int i, tlen;
	register const u_int16_t *sp;
	u_int32_t sum;
	union {
		struct {
			struct in6_addr ph_src;
			struct in6_addr ph_dst;
			u_int32_t	ph_len;
			u_int8_t	ph_zero[3];
			u_int8_t	ph_nxt;
		} ph;
		u_int16_t pa[20];
	} phu;

	tlen = ntohs(ip6->ip6_plen) + sizeof(struct ip6_hdr) -
	    ((const char *)up - (const char*)ip6);

	/* pseudo-header */
	memset(&phu, 0, sizeof(phu));
	phu.ph.ph_src = ip6->ip6_src;
	phu.ph.ph_dst = ip6->ip6_dst;
	phu.ph.ph_len = htonl(tlen);
	phu.ph.ph_nxt = IPPROTO_UDP;

	sum = 0;
	for (i = 0; i < sizeof(phu.pa) / sizeof(phu.pa[0]); i++)
		sum += phu.pa[i];

	sp = (const u_int16_t *)up;

	for (i = 0; i < (tlen & ~1); i += 2)
		sum += *sp++;

	if (tlen & 1)
		sum += htons((*(const char *)sp) << 8);

	while (sum > 0xffff)
		sum = (sum & 0xffff) + (sum >> 16);
	sum = ~sum & 0xffff;

	return (sum);
}
#endif


/* XXX probably should use getservbyname() and cache answers */
#define TFTP_PORT 69		/*XXX*/
#define KERBEROS_PORT 88	/*XXX*/
#define SUNRPC_PORT 111		/*XXX*/
#define SNMP_PORT 161		/*XXX*/
#define NTP_PORT 123		/*XXX*/
#define SNMPTRAP_PORT 162	/*XXX*/
#define ISAKMP_PORT 500		/*XXX*/
#define RIP_PORT 520		/*XXX*/
#define KERBEROS_SEC_PORT 750	/*XXX*/
#define L2TP_PORT 1701		/*XXX*/
#define ISAKMP_PORT_USER1 7500	/*??? - nonstandard*/
#define ISAKMP_PORT_USER2 8500	/*??? - nonstandard*/
#define RX_PORT_LOW 7000	/*XXX*/
#define RX_PORT_HIGH 7009	/*XXX*/
#define NETBIOS_NS_PORT   137
#define NETBIOS_DGRAM_PORT   138
#define CISCO_AUTORP_PORT 496	/*XXX*/

#ifdef INET6
#define RIPNG_PORT 521		/*XXX*/
#define DHCP6_SERV_PORT 546	/*XXX*/
#define DHCP6_CLI_PORT 547	/*XXX*/
#endif

void
udp_print(register const u_char *bp, u_int length, register const u_char *bp2)
{
	register const struct udphdr *up;
	register const struct ip *ip;
	register const u_char *cp;
	register const u_char *ep = bp + length;
	u_int16_t sport, dport, ulen;
#ifdef INET6
	register const struct ip6_hdr *ip6;
#endif

	if (ep > snapend)
		ep = snapend;
	up = (struct udphdr *)bp;
	ip = (struct ip *)bp2;
#ifdef INET6
	if (ip->ip_v == 6)
		ip6 = (struct ip6_hdr *)bp2;
	else
		ip6 = NULL;
#endif /*INET6*/
	cp = (u_char *)(up + 1);
	if (cp > snapend) {
		(void)printf("%s > %s: [|udp]",
			ipaddr_string(&ip->ip_src), ipaddr_string(&ip->ip_dst));
		return;
	}
	if (length < sizeof(struct udphdr)) {
		(void)printf("%s > %s: truncated-udp %d",
			ipaddr_string(&ip->ip_src), ipaddr_string(&ip->ip_dst),
			length);
		return;
	}
	length -= sizeof(struct udphdr);

	sport = ntohs(up->uh_sport);
	dport = ntohs(up->uh_dport);
	ulen = ntohs(up->uh_ulen);
	if (ulen < 8) {
		(void)printf("%s > %s: truncated-udplength %d",
			     ipaddr_string(&ip->ip_src),
			     ipaddr_string(&ip->ip_dst),
			     ulen);
		return;
	}
	if (packettype) {
		register struct rpc_msg *rp;
		enum msg_type direction;

		switch (packettype) {

		case PT_VAT:
			(void)printf("%s.%s > %s.%s:",
				ipaddr_string(&ip->ip_src),
				udpport_string(sport),
				ipaddr_string(&ip->ip_dst),
				udpport_string(dport));
			vat_print((void *)(up + 1), length, up);
			break;

		case PT_WB:
			(void)printf("%s.%s > %s.%s:",
				ipaddr_string(&ip->ip_src),
				udpport_string(sport),
				ipaddr_string(&ip->ip_dst),
				udpport_string(dport));
			wb_print((void *)(up + 1), length);
			break;

		case PT_RPC:
			rp = (struct rpc_msg *)(up + 1);
			direction = (enum msg_type)ntohl(rp->rm_direction);
			if (direction == CALL)
				sunrpcrequest_print((u_char *)rp, length,
				    (u_char *)ip);
			else
				nfsreply_print((u_char *)rp, length,
				    (u_char *)ip);			/*XXX*/
			break;

		case PT_RTP:
			(void)printf("%s.%s > %s.%s:",
				ipaddr_string(&ip->ip_src),
				udpport_string(sport),
				ipaddr_string(&ip->ip_dst),
				udpport_string(dport));
			rtp_print((void *)(up + 1), length, up);
			break;

		case PT_RTCP:
			(void)printf("%s.%s > %s.%s:",
				ipaddr_string(&ip->ip_src),
				udpport_string(sport),
				ipaddr_string(&ip->ip_dst),
				udpport_string(dport));
			while (cp < ep)
				cp = rtcp_print(cp, ep);
			break;

		case PT_SNMP:
			(void)printf("%s.%s > %s.%s:",
				ipaddr_string(&ip->ip_src),
				udpport_string(sport),
				ipaddr_string(&ip->ip_dst),
				udpport_string(dport));
			snmp_print((const u_char *)(up + 1), length);
			break;

		case PT_CNFP:
			(void)printf("%s.%s > %s.%s:",
				ipaddr_string(&ip->ip_src),
				udpport_string(sport),
				ipaddr_string(&ip->ip_dst),
				udpport_string(dport));
			cnfp_print(cp, length, (const u_char *)ip);
			break;
		}
		return;
	}

	if (!qflag) {
		register struct rpc_msg *rp;
		enum msg_type direction;

		rp = (struct rpc_msg *)(up + 1);
		if (TTEST(rp->rm_direction)) {
			direction = (enum msg_type)ntohl(rp->rm_direction);
			if (dport == NFS_PORT && direction == CALL) {
				nfsreq_print((u_char *)rp, length,
				    (u_char *)ip);
				return;
			}
			if (sport == NFS_PORT && direction == REPLY) {
				nfsreply_print((u_char *)rp, length,
				    (u_char *)ip);
				return;
			}
#ifdef notdef
			if (dport == SUNRPC_PORT && direction == CALL) {
				sunrpcrequest_print((u_char *)rp, length, (u_char *)ip);
				return;
			}
#endif
		}
		if (TTEST(((struct LAP *)cp)->type) &&
		    ((struct LAP *)cp)->type == lapDDP &&
		    (atalk_port(sport) || atalk_port(dport))) {
			if (vflag)
				fputs("kip ", stdout);
			atalk_print(cp, length);
			return;
		}
	}
#if 0
	(void)printf("%s.%s > %s.%s:",
		ipaddr_string(&ip->ip_src), udpport_string(sport),
		ipaddr_string(&ip->ip_dst), udpport_string(dport));
#else
#ifdef INET6
	if (ip6) {
		if (ip6->ip6_nxt == IPPROTO_UDP) {
			(void)printf("%s.%s > %s.%s: ",
				ip6addr_string(&ip6->ip6_src),
				udpport_string(sport),
				ip6addr_string(&ip6->ip6_dst),
				udpport_string(dport));
		} else {
			(void)printf("%s > %s: ",
				udpport_string(sport), udpport_string(dport));
		}
	} else
#endif /*INET6*/
	{
		if (ip->ip_p == IPPROTO_UDP) {
			(void)printf("%s.%s > %s.%s: ",
				ipaddr_string(&ip->ip_src),
				udpport_string(sport),
				ipaddr_string(&ip->ip_dst),
				udpport_string(dport));
		} else {
			(void)printf("%s > %s: ",
				udpport_string(sport), udpport_string(dport));
		}
	}
#endif

	if (ip->ip_v == 4 && vflag) {
		int sum = up->uh_sum;
		if (sum == 0) {
			(void)printf(" [no cksum]");
		} else if (TTEST2(cp[0], length)) {
			sum = udp_cksum(ip, up, length);
			if (sum != 0)
				(void)printf(" [bad udp cksum %x!]", sum);
			else
				(void)printf(" [udp sum ok]");
		}
	}
#ifdef INET6
	if (ip->ip_v == 6 && ip6->ip6_plen && vflag) {
		int sum = up->uh_sum;
		/* for IPv6, UDP checksum is mandatory */
		if (TTEST2(cp[0], length)) {
			sum = udp6_cksum(ip6, up, length);
			if (sum != 0)
				(void)printf(" [bad udp cksum %x!]", sum);
			else
				(void)printf(" [udp sum ok]");
		}
	}
#endif

	if (!qflag) {
#define ISPORT(p) (dport == (p) || sport == (p))
		if (ISPORT(NAMESERVER_PORT))
			ns_print((const u_char *)(up + 1), length);
		else if (ISPORT(TFTP_PORT))
			tftp_print((const u_char *)(up + 1), length);
		else if (ISPORT(IPPORT_BOOTPC) || ISPORT(IPPORT_BOOTPS))
			bootp_print((const u_char *)(up + 1), length,
			    sport, dport);
		else if (ISPORT(RIP_PORT))
			rip_print((const u_char *)(up + 1), length);
		else if (ISPORT(ISAKMP_PORT))
			isakmp_print((const u_char *)(up + 1), length, bp2);
#if 1 /*???*/
		else if (ISPORT(ISAKMP_PORT_USER1) || ISPORT(ISAKMP_PORT_USER2))
			isakmp_print((const u_char *)(up + 1), length, bp2);
#endif
		else if (ISPORT(SNMP_PORT) || ISPORT(SNMPTRAP_PORT))
			snmp_print((const u_char *)(up + 1), length);
		else if (ISPORT(NTP_PORT))
			ntp_print((const u_char *)(up + 1), length);
		else if (ISPORT(KERBEROS_PORT) || ISPORT(KERBEROS_SEC_PORT))
			krb_print((const void *)(up + 1), length);
		else if (ISPORT(L2TP_PORT))
			l2tp_print((const u_char *)(up + 1), length);
 		else if (ISPORT(NETBIOS_NS_PORT)) {
			nbt_udp137_print((const u_char *)(up + 1), length);
 		}
 		else if (ISPORT(NETBIOS_DGRAM_PORT)) {
 			nbt_udp138_print((const u_char *)(up + 1), length);
 		}
		else if (dport == 3456)
			vat_print((const void *)(up + 1), length, up);
 		/*
 		 * Since there are 10 possible ports to check, I think
 		 * a <> test would be more efficient
 		 */
 		else if ((sport >= RX_PORT_LOW && sport <= RX_PORT_HIGH) ||
 			 (dport >= RX_PORT_LOW && dport <= RX_PORT_HIGH))
 			rx_print((const void *)(up + 1), length, sport, dport,
 				 (u_char *) ip);
#ifdef INET6
		else if (ISPORT(RIPNG_PORT))
			ripng_print((const u_char *)(up + 1), length);
		else if (ISPORT(DHCP6_SERV_PORT) || ISPORT(DHCP6_CLI_PORT)) {
			dhcp6_print((const u_char *)(up + 1), length,
				sport, dport);
		}
#endif /*INET6*/
		/*
		 * Kludge in test for whiteboard packets.
		 */
		else if (dport == 4567)
			wb_print((const void *)(up + 1), length);
		else if (ISPORT(CISCO_AUTORP_PORT))
			cisco_autorp_print((const void *)(up + 1), length);
		else
			(void)printf(" udp %u",
			    (u_int32_t)(ulen - sizeof(*up)));
#undef ISPORT
	} else
		(void)printf(" udp %u", (u_int32_t)(ulen - sizeof(*up)));
}