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c422d3ab0f
tcpdump/print-udp.c
guy c422d3ab0f Get rid of the "-Wno-unused" flag, and fix up most of the 
unused-parameter problems reported by GCC.  Add an _U_ tag to label
parameters as unused if the function is called through a pointer (so
that you can't change its signature by removing parameters) or if there
are unused parameters only because the function isn't complete.

Add some additional bounds checks the necessity for which was revealed
while cleaning up unused-parameter problems.

Make some routines static.

"lcp_print()", defined in "print-lcp.c", isn't called anywhere -
"print-ppp.c" has the code to dissect LCP.  Get rid of "print-lcp.c".
2002-09-05 21:25:34 +00:00

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/*
* 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 1.109 2002-09-05 21:25:50 guy Exp $ (LBL)";
#endif
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <tcpdump-stdinc.h>
#ifdef SEGSIZE
#undef SEGSIZE
#endif
#include <arpa/tftp.h>
#include <rpc/rpc.h>
#include <stdio.h>
#include <string.h>
#include "interface.h"
#include "addrtoname.h"
#include "appletalk.h"
#include "udp.h"
#include "ip.h"
#ifdef INET6
#include "ip6.h"
#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, 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)
{
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;
/* pseudo-header.. */
phu.ph.len = htons(len);
phu.ph.mbz = 0;
phu.ph.proto = IPPROTO_UDP;
memcpy(&phu.ph.src, &ip->ip_src.s_addr, sizeof(u_int32_t));
if (IP_HL(ip) == 5)
memcpy(&phu.ph.dst, &ip->ip_dst.s_addr, sizeof(u_int32_t));
else
phu.ph.dst = ip_finddst(ip);
sp = &phu.pa[0];
return in_cksum((u_short *)up, len,
sp[0]+sp[1]+sp[2]+sp[3]+sp[4]+sp[5]);
}
#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 u_int8_t *)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 TIMED_PORT 525 /*XXX*/
#define RIP_PORT 520 /*XXX*/
#define LDP_PORT 646
#define KERBEROS_SEC_PORT 750 /*XXX*/
#define L2TP_PORT 1701 /*XXX*/
#define ISAKMP_PORT_USER1 7500 /*XXX - nonstandard*/
#define ISAKMP_PORT_USER2 8500 /*XXX - 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*/
#define RADIUS_PORT 1645
#define RADIUS_NEW_PORT 1812
#define RADIUS_ACCOUNTING_PORT 1646
#define RADIUS_NEW_ACCOUNTING_PORT 1813
#define HSRP_PORT 1985 /*XXX*/
#define LWRES_PORT 921
#define ZEPHYR_SRV_PORT 2103
#define ZEPHYR_CLT_PORT 2104
#ifdef INET6
#define RIPNG_PORT 521 /*XXX*/
#define DHCP6_SERV_PORT 546 /*XXX*/
#define DHCP6_CLI_PORT 547 /*XXX*/
#endif
static void
udpipaddr_print(const struct ip *ip, u_int16_t sport, u_int16_t dport)
{
#ifdef INET6
const struct ip6_hdr *ip6;
if (IP_V(ip) == 6)
ip6 = (const struct ip6_hdr *)ip;
else
ip6 = NULL;
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));
}
}
}
void
udp_print(register const u_char *bp, u_int length,
register const u_char *bp2, int fragmented)
{
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_V(ip) == 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:
udpipaddr_print(ip, sport, dport);
vat_print((void *)(up + 1), up);
break;
case PT_WB:
udpipaddr_print(ip, sport, 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:
udpipaddr_print(ip, sport, dport);
rtp_print((void *)(up + 1), length, up);
break;
case PT_RTCP:
udpipaddr_print(ip, sport, dport);
while (cp < ep)
cp = rtcp_print(cp, ep);
break;
case PT_SNMP:
udpipaddr_print(ip, sport, dport);
snmp_print((const u_char *)(up + 1), length);
break;
case PT_CNFP:
udpipaddr_print(ip, sport, dport);
cnfp_print(cp, (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);
llap_print(cp, length);
return;
}
}
udpipaddr_print(ip, sport, dport);
if (IP_V(ip) == 4 && vflag && !fragmented) {
int sum = up->uh_sum;
if (sum == 0) {
(void)printf("[no cksum] ");
} else if (TTEST2(cp[0], length)) {
sum = udp_cksum(ip, up, length + sizeof(struct udphdr));
if (sum != 0)
(void)printf("[bad udp cksum %x!] ", sum);
else
(void)printf("[udp sum ok] ");
}
}
#ifdef INET6
if (IP_V(ip) == 6 && ip6->ip6_plen && vflag && !fragmented) {
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) || ISPORT(MULTICASTDNS_PORT))
ns_print((const u_char *)(up + 1), length);
else if (ISPORT(TIMED_PORT))
timed_print((const u_char *)(up + 1));
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), 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));
else if (ISPORT(L2TP_PORT))
l2tp_print((const u_char *)(up + 1), length);
#ifdef TCPDUMP_DO_SMB
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);
#endif
else if (dport == 3456)
vat_print((const void *)(up + 1), up);
else if (ISPORT(ZEPHYR_SRV_PORT) || ISPORT(ZEPHYR_CLT_PORT))
zephyr_print((const void *)(up + 1), length);
/*
* 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 if (ISPORT(RADIUS_PORT) ||
ISPORT(RADIUS_NEW_PORT) ||
ISPORT(RADIUS_ACCOUNTING_PORT) ||
ISPORT(RADIUS_NEW_ACCOUNTING_PORT) )
radius_print((const u_char *)(up+1), length);
else if (dport == HSRP_PORT)
hsrp_print((const u_char *)(up + 1), length);
else if (ISPORT(LWRES_PORT))
lwres_print((const u_char *)(up + 1), length);
else if (ISPORT(LDP_PORT))
printf("LDP, length: %u", 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)));
}
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