mirror of
https://github.com/the-tcpdump-group/tcpdump.git
synced 2024-11-23 18:14:29 +08:00
d8acd8f5d0
For each decoder that has more than one instance of truncation signaling
and prints the same string in each instance make sure that the string is
declared as "static const char tstr[]" right after the initial includes
block. Where necessary, replace fputs(s, stdout) with equivalent
printf("%s", s).
467 lines
10 KiB
C
467 lines
10 KiB
C
/*
|
|
* Copyright (C) Arnaldo Carvalho de Melo 2004
|
|
* Copyright (C) Ian McDonald 2005
|
|
* Copyright (C) Yoshifumi Nishida 2005
|
|
*
|
|
* This software may be distributed either under the terms of the
|
|
* BSD-style license that accompanies tcpdump or the GNU GPL version 2
|
|
*/
|
|
|
|
#ifndef lint
|
|
static const char rcsid[] _U_ =
|
|
"@(#) $Header: /tcpdump/master/tcpdump/print-dccp.c,v 1.8 2007-11-09 00:44:09 guy Exp $ (LBL)";
|
|
#endif
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
#include "config.h"
|
|
#endif
|
|
|
|
#include <tcpdump-stdinc.h>
|
|
|
|
#include "dccp.h"
|
|
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
|
|
#include "interface.h"
|
|
#include "addrtoname.h"
|
|
#include "extract.h" /* must come after interface.h */
|
|
#include "ip.h"
|
|
#ifdef INET6
|
|
#include "ip6.h"
|
|
#endif
|
|
#include "ipproto.h"
|
|
|
|
static const char tstr[] = "[|dccp]";
|
|
|
|
static const char *dccp_reset_codes[] = {
|
|
"unspecified",
|
|
"closed",
|
|
"aborted",
|
|
"no_connection",
|
|
"packet_error",
|
|
"option_error",
|
|
"mandatory_error",
|
|
"connection_refused",
|
|
"bad_service_code",
|
|
"too_busy",
|
|
"bad_init_cookie",
|
|
"aggression_penalty",
|
|
};
|
|
|
|
static const char *dccp_feature_nums[] = {
|
|
"reserved",
|
|
"ccid",
|
|
"allow_short_seqno",
|
|
"sequence_window",
|
|
"ecn_incapable",
|
|
"ack_ratio",
|
|
"send_ack_vector",
|
|
"send_ndp_count",
|
|
"minimum checksum coverage",
|
|
"check data checksum",
|
|
};
|
|
|
|
static inline u_int dccp_csum_coverage(const struct dccp_hdr* dh, u_int len)
|
|
{
|
|
u_int cov;
|
|
|
|
if (DCCPH_CSCOV(dh) == 0)
|
|
return len;
|
|
cov = (dh->dccph_doff + DCCPH_CSCOV(dh) - 1) * sizeof(u_int32_t);
|
|
return (cov > len)? len : cov;
|
|
}
|
|
|
|
static int dccp_cksum(const struct ip *ip,
|
|
const struct dccp_hdr *dh, u_int len)
|
|
{
|
|
return nextproto4_cksum(ip, (const u_int8_t *)(void *)dh,
|
|
dccp_csum_coverage(dh, len), IPPROTO_DCCP);
|
|
}
|
|
|
|
#ifdef INET6
|
|
static int dccp6_cksum(const struct ip6_hdr *ip6, const struct dccp_hdr *dh, u_int len)
|
|
{
|
|
return nextproto6_cksum(ip6, (const u_int8_t *)(void *)dh,
|
|
dccp_csum_coverage(dh, len), IPPROTO_DCCP);
|
|
}
|
|
#endif
|
|
|
|
static const char *dccp_reset_code(u_int8_t code)
|
|
{
|
|
if (code >= __DCCP_RESET_CODE_LAST)
|
|
return "invalid";
|
|
return dccp_reset_codes[code];
|
|
}
|
|
|
|
static u_int64_t dccp_seqno(const struct dccp_hdr *dh)
|
|
{
|
|
u_int32_t seq_high = DCCPH_SEQ(dh);
|
|
u_int64_t seqno = EXTRACT_24BITS(&seq_high) & 0xFFFFFF;
|
|
|
|
if (DCCPH_X(dh) != 0) {
|
|
const struct dccp_hdr_ext *dhx = (void *)(dh + 1);
|
|
u_int32_t seq_low = dhx->dccph_seq_low;
|
|
seqno &= 0x00FFFF; /* clear reserved field */
|
|
seqno = (seqno << 32) + EXTRACT_32BITS(&seq_low);
|
|
}
|
|
|
|
return seqno;
|
|
}
|
|
|
|
static inline unsigned int dccp_basic_hdr_len(const struct dccp_hdr *dh)
|
|
{
|
|
return sizeof(*dh) + (DCCPH_X(dh) ? sizeof(struct dccp_hdr_ext) : 0);
|
|
}
|
|
|
|
static void dccp_print_ack_no(const u_char *bp)
|
|
{
|
|
const struct dccp_hdr *dh = (const struct dccp_hdr *)bp;
|
|
const struct dccp_hdr_ack_bits *dh_ack =
|
|
(struct dccp_hdr_ack_bits *)(bp + dccp_basic_hdr_len(dh));
|
|
u_int32_t ack_high;
|
|
u_int64_t ackno;
|
|
|
|
TCHECK2(*dh_ack,4);
|
|
ack_high = DCCPH_ACK(dh_ack);
|
|
ackno = EXTRACT_24BITS(&ack_high) & 0xFFFFFF;
|
|
|
|
if (DCCPH_X(dh) != 0) {
|
|
u_int32_t ack_low;
|
|
|
|
TCHECK2(*dh_ack,8);
|
|
ack_low = dh_ack->dccph_ack_nr_low;
|
|
|
|
ackno &= 0x00FFFF; /* clear reserved field */
|
|
ackno = (ackno << 32) + EXTRACT_32BITS(&ack_low);
|
|
}
|
|
|
|
(void)printf("(ack=%" PRIu64 ") ", ackno);
|
|
trunc:
|
|
return;
|
|
}
|
|
|
|
static inline unsigned int dccp_packet_hdr_len(const u_int8_t type)
|
|
{
|
|
if (type == DCCP_PKT_DATA)
|
|
return 0;
|
|
if (type == DCCP_PKT_DATAACK ||
|
|
type == DCCP_PKT_ACK ||
|
|
type == DCCP_PKT_SYNC ||
|
|
type == DCCP_PKT_SYNCACK ||
|
|
type == DCCP_PKT_CLOSE ||
|
|
type == DCCP_PKT_CLOSEREQ)
|
|
return sizeof(struct dccp_hdr_ack_bits);
|
|
if (type == DCCP_PKT_REQUEST)
|
|
return sizeof(struct dccp_hdr_request);
|
|
if (type == DCCP_PKT_RESPONSE)
|
|
return sizeof(struct dccp_hdr_response);
|
|
return sizeof(struct dccp_hdr_reset);
|
|
}
|
|
|
|
static int dccp_print_option(const u_char *option);
|
|
|
|
/**
|
|
* dccp_print - show dccp packet
|
|
* @bp - beginning of dccp packet
|
|
* @data2 - beginning of enclosing
|
|
* @len - lenght of ip packet
|
|
*/
|
|
void dccp_print(const u_char *bp, const u_char *data2, u_int len)
|
|
{
|
|
const struct dccp_hdr *dh;
|
|
const struct ip *ip;
|
|
#ifdef INET6
|
|
const struct ip6_hdr *ip6;
|
|
#endif
|
|
const u_char *cp;
|
|
u_short sport, dport;
|
|
u_int hlen;
|
|
u_int extlen = 0;
|
|
|
|
dh = (const struct dccp_hdr *)bp;
|
|
|
|
ip = (struct ip *)data2;
|
|
#ifdef INET6
|
|
if (IP_V(ip) == 6)
|
|
ip6 = (const struct ip6_hdr *)data2;
|
|
else
|
|
ip6 = NULL;
|
|
#endif /*INET6*/
|
|
cp = (const u_char *)(dh + 1);
|
|
if (cp > snapend) {
|
|
printf("[Invalid packet|dccp]");
|
|
return;
|
|
}
|
|
|
|
if (len < sizeof(struct dccp_hdr)) {
|
|
printf("truncated-dccp - %ld bytes missing!",
|
|
(long)len - sizeof(struct dccp_hdr));
|
|
return;
|
|
}
|
|
|
|
sport = EXTRACT_16BITS(&dh->dccph_sport);
|
|
dport = EXTRACT_16BITS(&dh->dccph_dport);
|
|
hlen = dh->dccph_doff * 4;
|
|
|
|
#ifdef INET6
|
|
if (ip6) {
|
|
(void)printf("%s.%d > %s.%d: ",
|
|
ip6addr_string(&ip6->ip6_src), sport,
|
|
ip6addr_string(&ip6->ip6_dst), dport);
|
|
} else
|
|
#endif /*INET6*/
|
|
{
|
|
(void)printf("%s.%d > %s.%d: ",
|
|
ipaddr_string(&ip->ip_src), sport,
|
|
ipaddr_string(&ip->ip_dst), dport);
|
|
}
|
|
fflush(stdout);
|
|
|
|
if (qflag) {
|
|
(void)printf(" %d", len - hlen);
|
|
if (hlen > len) {
|
|
(void)printf("dccp [bad hdr length %u - too long, > %u]",
|
|
hlen, len);
|
|
}
|
|
return;
|
|
}
|
|
|
|
/* other variables in generic header */
|
|
if (vflag) {
|
|
(void)printf("CCVal %d, CsCov %d, ", DCCPH_CCVAL(dh), DCCPH_CSCOV(dh));
|
|
}
|
|
|
|
/* checksum calculation */
|
|
if (vflag && TTEST2(bp[0], len)) {
|
|
u_int16_t sum = 0, dccp_sum;
|
|
|
|
dccp_sum = EXTRACT_16BITS(&dh->dccph_checksum);
|
|
(void)printf("cksum 0x%04x ", dccp_sum);
|
|
if (IP_V(ip) == 4)
|
|
sum = dccp_cksum(ip, dh, len);
|
|
#ifdef INET6
|
|
else if (IP_V(ip) == 6)
|
|
sum = dccp6_cksum(ip6, dh, len);
|
|
#endif
|
|
if (sum != 0)
|
|
(void)printf("(incorrect -> 0x%04x), ",in_cksum_shouldbe(dccp_sum, sum));
|
|
else
|
|
(void)printf("(correct), ");
|
|
}
|
|
|
|
switch (DCCPH_TYPE(dh)) {
|
|
case DCCP_PKT_REQUEST: {
|
|
struct dccp_hdr_request *dhr =
|
|
(struct dccp_hdr_request *)(bp + dccp_basic_hdr_len(dh));
|
|
TCHECK(*dhr);
|
|
(void)printf("request (service=%d) ",
|
|
EXTRACT_32BITS(&dhr->dccph_req_service));
|
|
extlen += 4;
|
|
break;
|
|
}
|
|
case DCCP_PKT_RESPONSE: {
|
|
struct dccp_hdr_response *dhr =
|
|
(struct dccp_hdr_response *)(bp + dccp_basic_hdr_len(dh));
|
|
TCHECK(*dhr);
|
|
(void)printf("response (service=%d) ",
|
|
EXTRACT_32BITS(&dhr->dccph_resp_service));
|
|
extlen += 12;
|
|
break;
|
|
}
|
|
case DCCP_PKT_DATA:
|
|
(void)printf("data ");
|
|
break;
|
|
case DCCP_PKT_ACK: {
|
|
(void)printf("ack ");
|
|
extlen += 8;
|
|
break;
|
|
}
|
|
case DCCP_PKT_DATAACK: {
|
|
(void)printf("dataack ");
|
|
extlen += 8;
|
|
break;
|
|
}
|
|
case DCCP_PKT_CLOSEREQ:
|
|
(void)printf("closereq ");
|
|
extlen += 8;
|
|
break;
|
|
case DCCP_PKT_CLOSE:
|
|
(void)printf("close ");
|
|
extlen += 8;
|
|
break;
|
|
case DCCP_PKT_RESET: {
|
|
struct dccp_hdr_reset *dhr =
|
|
(struct dccp_hdr_reset *)(bp + dccp_basic_hdr_len(dh));
|
|
TCHECK(*dhr);
|
|
(void)printf("reset (code=%s) ",
|
|
dccp_reset_code(dhr->dccph_reset_code));
|
|
extlen += 12;
|
|
break;
|
|
}
|
|
case DCCP_PKT_SYNC:
|
|
(void)printf("sync ");
|
|
extlen += 8;
|
|
break;
|
|
case DCCP_PKT_SYNCACK:
|
|
(void)printf("syncack ");
|
|
extlen += 8;
|
|
break;
|
|
default:
|
|
(void)printf("invalid ");
|
|
break;
|
|
}
|
|
|
|
if ((DCCPH_TYPE(dh) != DCCP_PKT_DATA) &&
|
|
(DCCPH_TYPE(dh) != DCCP_PKT_REQUEST))
|
|
dccp_print_ack_no(bp);
|
|
|
|
if (vflag < 2)
|
|
return;
|
|
|
|
(void)printf("seq %" PRIu64, dccp_seqno(dh));
|
|
|
|
/* process options */
|
|
if (hlen > dccp_basic_hdr_len(dh) + extlen){
|
|
const u_char *cp;
|
|
u_int optlen;
|
|
cp = bp + dccp_basic_hdr_len(dh) + extlen;
|
|
printf(" <");
|
|
|
|
hlen -= dccp_basic_hdr_len(dh) + extlen;
|
|
while(1){
|
|
TCHECK(*cp);
|
|
optlen = dccp_print_option(cp);
|
|
if (!optlen) goto trunc2;
|
|
if (hlen <= optlen) break;
|
|
hlen -= optlen;
|
|
cp += optlen;
|
|
printf(", ");
|
|
}
|
|
printf(">");
|
|
}
|
|
return;
|
|
trunc:
|
|
printf("%s", tstr);
|
|
trunc2:
|
|
return;
|
|
}
|
|
|
|
static int dccp_print_option(const u_char *option)
|
|
{
|
|
u_int8_t optlen, i;
|
|
|
|
TCHECK(*option);
|
|
|
|
if (*option >= 32) {
|
|
TCHECK(*(option+1));
|
|
optlen = *(option +1);
|
|
if (optlen < 2) {
|
|
printf("Option %d optlen too short",*option);
|
|
return 1;
|
|
}
|
|
} else optlen = 1;
|
|
|
|
TCHECK2(*option,optlen);
|
|
|
|
switch (*option){
|
|
case 0:
|
|
printf("nop");
|
|
break;
|
|
case 1:
|
|
printf("mandatory");
|
|
break;
|
|
case 2:
|
|
printf("slowreceiver");
|
|
break;
|
|
case 32:
|
|
printf("change_l");
|
|
if (*(option +2) < 10){
|
|
printf(" %s", dccp_feature_nums[*(option +2)]);
|
|
for (i = 0; i < optlen -3; i ++) printf(" %d", *(option +3 + i));
|
|
}
|
|
break;
|
|
case 33:
|
|
printf("confirm_l");
|
|
if (*(option +2) < 10){
|
|
printf(" %s", dccp_feature_nums[*(option +2)]);
|
|
for (i = 0; i < optlen -3; i ++) printf(" %d", *(option +3 + i));
|
|
}
|
|
break;
|
|
case 34:
|
|
printf("change_r");
|
|
if (*(option +2) < 10){
|
|
printf(" %s", dccp_feature_nums[*(option +2)]);
|
|
for (i = 0; i < optlen -3; i ++) printf(" %d", *(option +3 + i));
|
|
}
|
|
break;
|
|
case 35:
|
|
printf("confirm_r");
|
|
if (*(option +2) < 10){
|
|
printf(" %s", dccp_feature_nums[*(option +2)]);
|
|
for (i = 0; i < optlen -3; i ++) printf(" %d", *(option +3 + i));
|
|
}
|
|
break;
|
|
case 36:
|
|
printf("initcookie 0x");
|
|
for (i = 0; i < optlen -2; i ++) printf("%02x", *(option +2 + i));
|
|
break;
|
|
case 37:
|
|
printf("ndp_count");
|
|
for (i = 0; i < optlen -2; i ++) printf(" %d", *(option +2 + i));
|
|
break;
|
|
case 38:
|
|
printf("ack_vector0 0x");
|
|
for (i = 0; i < optlen -2; i ++) printf("%02x", *(option +2 + i));
|
|
break;
|
|
case 39:
|
|
printf("ack_vector1 0x");
|
|
for (i = 0; i < optlen -2; i ++) printf("%02x", *(option +2 + i));
|
|
break;
|
|
case 40:
|
|
printf("data_dropped 0x");
|
|
for (i = 0; i < optlen -2; i ++) printf("%02x", *(option +2 + i));
|
|
break;
|
|
case 41:
|
|
printf("timestamp %u", EXTRACT_32BITS(option + 2));
|
|
break;
|
|
case 42:
|
|
printf("timestamp_echo %u", EXTRACT_32BITS(option + 2));
|
|
break;
|
|
case 43:
|
|
printf("elapsed_time ");
|
|
if (optlen == 6)
|
|
printf("%u", EXTRACT_32BITS(option + 2));
|
|
else
|
|
printf("%u", EXTRACT_16BITS(option + 2));
|
|
break;
|
|
case 44:
|
|
printf("data_checksum ");
|
|
for (i = 0; i < optlen -2; i ++) printf("%02x", *(option +2 + i));
|
|
break;
|
|
default :
|
|
if (*option >= 128) {
|
|
printf("CCID option %d",*option);
|
|
switch (optlen) {
|
|
case 4:
|
|
printf(" %u", EXTRACT_16BITS(option + 2));
|
|
break;
|
|
case 6:
|
|
printf(" %u", EXTRACT_32BITS(option + 2));
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
break;
|
|
}
|
|
|
|
printf("unknown_opt %d", *option);
|
|
break;
|
|
}
|
|
|
|
return optlen;
|
|
trunc:
|
|
printf("%s", tstr);
|
|
return 0;
|
|
}
|