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packet-dns.c
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/* packet-dns.c
* Routines for DNS packet disassembly
*
* $Id: packet-dns.c,v 1.32 1999/12/07 00:22:10 nneul Exp $
*
* Ethereal - Network traffic analyzer
* By Gerald Combs <gerald@zing.org>
* Copyright 1998 Gerald Combs
*
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#ifdef HAVE_SYS_TYPES_H
# include <sys/types.h>
#endif
#include <stdio.h>
#include <string.h>
#include <memory.h>
#include <glib.h>
#include "packet.h"
#include "packet-dns.h"
#include "util.h"
static int proto_dns = -1;
static int hf_dns_response = -1;
static int hf_dns_query = -1;
static int hf_dns_flags = -1;
static int hf_dns_transaction_id = -1;
static int hf_dns_count_questions = -1;
static int hf_dns_count_answers = -1;
static int hf_dns_count_auth_rr = -1;
static int hf_dns_count_add_rr = -1;
static gint ett_dns = -1;
static gint ett_dns_qd = -1;
static gint ett_dns_rr = -1;
static gint ett_dns_qry = -1;
static gint ett_dns_ans = -1;
static gint ett_dns_flags = -1;
static gint ett_t_key_flags = -1;
/* DNS structs and definitions */
/* Offsets of fields in the DNS header. */
#define DNS_ID 0
#define DNS_FLAGS 2
#define DNS_QUEST 4
#define DNS_ANS 6
#define DNS_AUTH 8
#define DNS_ADD 10
/* Length of DNS header. */
#define DNS_HDRLEN 12
/* type values */
#define T_A 1 /* host address */
#define T_NS 2 /* authoritative name server */
#define T_MD 3 /* mail destination (obsolete) */
#define T_MF 4 /* mail forwarder (obsolete) */
#define T_CNAME 5 /* canonical name */
#define T_SOA 6 /* start of authority zone */
#define T_MB 7 /* mailbox domain name (experimental) */
#define T_MG 8 /* mail group member (experimental) */
#define T_MR 9 /* mail rename domain name (experimental) */
#define T_NULL 10 /* null RR (experimental) */
#define T_WKS 11 /* well known service */
#define T_PTR 12 /* domain name pointer */
#define T_HINFO 13 /* host information */
#define T_MINFO 14 /* mailbox or mail list information */
#define T_MX 15 /* mail routing information */
#define T_TXT 16 /* text strings */
#define T_RP 17 /* responsible person (RFC 1183) */
#define T_AFSDB 18 /* AFS data base location (RFC 1183) */
#define T_X25 19 /* X.25 address (RFC 1183) */
#define T_ISDN 20 /* ISDN address (RFC 1183) */
#define T_RT 21 /* route-through (RFC 1183) */
#define T_NSAP 22 /* OSI NSAP (RFC 1706) */
#define T_NSAP_PTR 23 /* PTR equivalent for OSI NSAP (RFC 1348 - obsolete) */
#define T_SIG 24 /* digital signature (RFC 2065) */
#define T_KEY 25 /* public key (RFC 2065) */
#define T_PX 26 /* pointer to X.400/RFC822 mapping info (RFC 1664) */
#define T_GPOS 27 /* geographical position (RFC 1712) */
#define T_AAAA 28 /* IPv6 address (RFC 1886) */
#define T_LOC 29 /* geographical location (RFC 1876) */
#define T_NXT 30 /* "next" name (RFC 2065) */
#define T_EID 31 /* ??? (Nimrod?) */
#define T_NIMLOC 32 /* ??? (Nimrod?) */
#define T_SRV 33 /* service location (RFC 2052) */
#define T_ATMA 34 /* ??? */
#define T_NAPTR 35 /* naming authority pointer (RFC 2168) */
/* Bit fields in the flags */
#define F_RESPONSE (1<<15) /* packet is response */
#define F_OPCODE (0xF<<11) /* query opcode */
#define F_AUTHORITATIVE (1<<10) /* response is authoritative */
#define F_TRUNCATED (1<<9) /* response is truncated */
#define F_RECDESIRED (1<<8) /* recursion desired */
#define F_RECAVAIL (1<<7) /* recursion available */
#define F_RCODE (0xF<<0) /* reply code */
/* Opcodes */
#define OPCODE_QUERY (0<<11) /* standard query */
#define OPCODE_IQUERY (1<<11) /* inverse query */
#define OPCODE_STATUS (2<<11) /* server status request */
/* Reply codes */
#define RCODE_NOERROR (0<<0)
#define RCODE_FMTERROR (1<<0)
#define RCODE_SERVFAIL (2<<0)
#define RCODE_NAMEERROR (3<<0)
#define RCODE_NOTIMPL (4<<0)
#define RCODE_REFUSED (5<<0)
/* See RFC 1035 for all RR types for which no RFC is listed. */
static char *
dns_type_name (u_int type)
{
char *type_names[36] = {
"unused",
"A",
"NS",
"MD",
"MF",
"CNAME",
"SOA",
"MB",
"MG",
"MR",
"NULL",
"WKS",
"PTR",
"HINFO",
"MINFO",
"MX",
"TXT",
"RP", /* RFC 1183 */
"AFSDB", /* RFC 1183 */
"X25", /* RFC 1183 */
"ISDN", /* RFC 1183 */
"RT", /* RFC 1183 */
"NSAP", /* RFC 1706 */
"NSAP-PTR", /* RFC 1348 */
"SIG", /* RFC 2065 */
"KEY", /* RFC 2065 */
"PX", /* RFC 1664 */
"GPOS", /* RFC 1712 */
"AAAA", /* RFC 1886 */
"LOC", /* RFC 1876 */
"NXT", /* RFC 2065 */
"EID",
"NIMLOC",
"SRV", /* RFC 2052 */
"ATMA",
"NAPTR" /* RFC 2168 */
};
if (type <= 35)
return type_names[type];
/* special cases */
switch (type)
{
/* non standard */
case 100:
return "UINFO";
case 101:
return "UID";
case 102:
return "GID";
case 103:
return "UNSPEC";
/* queries */
case 251:
return "IXFR"; /* RFC 1995 */
case 252:
return "AXFR";
case 253:
return "MAILB";
case 254:
return "MAILA";
case 255:
return "ANY";
}
return "unknown";
}
static char *
dns_long_type_name (u_int type)
{
char *type_names[36] = {
"unused",
"Host address",
"Authoritative name server",
"Mail destination",
"Mail forwarder",
"Canonical name for an alias",
"Start of zone of authority",
"Mailbox domain name",
"Mail group member",
"Mail rename domain name",
"Null resource record",
"Well-known service description",
"Domain name pointer",
"Host information",
"Mailbox or mail list information",
"Mail exchange",
"Text strings",
"Responsible person", /* RFC 1183 */
"AFS data base location", /* RFC 1183 */
"X.25 address", /* RFC 1183 */
"ISDN number", /* RFC 1183 */
"Route through", /* RFC 1183 */
"OSI NSAP", /* RFC 1706 */
"OSI NSAP name pointer", /* RFC 1348 */
"Signature", /* RFC 2065 */
"Public key", /* RFC 2065 */
"Pointer to X.400/RFC822 mapping info", /* RFC 1664 */
"Geographical position", /* RFC 1712 */
"IPv6 address", /* RFC 1886 */
"Location", /* RFC 1876 */
"Next", /* RFC 2065 */
"EID",
"NIMLOC",
"Service location", /* RFC 2052 */
"ATMA",
"Naming authority pointer" /* RFC 2168 */
};
static char unkbuf[7+1+2+1+4+1+1+10+1+1]; /* "Unknown RR type (%d)" */
if (type <= 35)
return type_names[type];
/* special cases */
switch (type)
{
/* non standard */
case 100:
return "UINFO";
case 101:
return "UID";
case 102:
return "GID";
case 103:
return "UNSPEC";
/* queries */
case 251:
return "Request for incremental zone transfer"; /* RFC 1995 */
case 252:
return "Request for full zone transfer";
case 253:
return "Request for mailbox-related records";
case 254:
return "Request for mail agent resource records";
case 255:
return "Request for all records";
}
sprintf(unkbuf, "Unknown RR type (%d)", type);
return unkbuf;
}
char *
dns_class_name(int class)
{
char *class_name;
switch (class) {
case 1:
class_name = "inet";
break;
case 3:
class_name = "chaos";
break;
case 4:
class_name = "hesiod";
break;
default:
class_name = "unknown";
}
return class_name;
}
int
get_dns_name(const u_char *pd, int offset, int dns_data_offset,
char *name, int maxname)
{
const u_char *dp = pd + offset;
const u_char *dptr = dp;
char *np = name;
int len = -1;
u_int component_len;
maxname--; /* reserve space for the trailing '\0' */
for (;;) {
if (!BYTES_ARE_IN_FRAME(offset, 1))
goto overflow;
component_len = *dp++;
offset++;
if (component_len == 0)
break;
switch (component_len & 0xc0) {
case 0x00:
/* Label */
if (np != name) {
/* Not the first component - put in a '.'. */
if (maxname > 0) {
*np++ = '.';
maxname--;
}
}
if (!BYTES_ARE_IN_FRAME(offset, component_len))
goto overflow;
while (component_len > 0) {
if (maxname > 0) {
*np++ = *dp;
maxname--;
}
component_len--;
dp++;
offset++;
}
break;
case 0x40:
case 0x80:
goto error; /* error */
case 0xc0:
/* Pointer. */
/* XXX - check to make sure we aren't looping, by keeping track
of how many characters are in the DNS packet, and of how many
characters we've looked at, and quitting if the latter
becomes bigger than the former. */
if (!BYTES_ARE_IN_FRAME(offset, 1))
goto overflow;
offset = dns_data_offset + (((component_len & ~0xc0) << 8) | (*dp++));
/* If "len" is negative, we are still working on the original name,
not something pointed to by a pointer, and so we should set "len"
to the length of the original name. */
if (len < 0)
len = dp - dptr;
dp = pd + offset;
break; /* now continue processing from there */
}
}
error:
*np = '\0';
/* If "len" is negative, we haven't seen a pointer, and thus haven't
set the length, so set it. */
if (len < 0)
len = dp - dptr;
/* Zero-length name means "root server" */
if (*name == '\0')
strcpy(name, "<Root>");
return len;
overflow:
/* We ran past the end of the captured data in the packet. */
strcpy(name, "<Name goes past end of captured data in packet>");
/* If "len" is negative, we haven't seen a pointer, and thus haven't
set the length, so set it. */
if (len < 0)
len = dp - dptr;
return len;
}
static int
get_dns_name_type_class(const u_char *pd, int offset, int dns_data_offset,
char *name_ret, int *name_len_ret, int *type_ret, int *class_ret)
{
int len;
int name_len;
int type;
int class;
char name[MAXDNAME];
int start_offset = offset;
name_len = get_dns_name(pd, offset, dns_data_offset, name, sizeof(name));
offset += name_len;
if (!BYTES_ARE_IN_FRAME(offset, 2)) {
/* We ran past the end of the captured data in the packet. */
return -1;
}
type = pntohs(&pd[offset]);
offset += 2;
if (!BYTES_ARE_IN_FRAME(offset, 2)) {
/* We ran past the end of the captured data in the packet. */
return -1;
}
class = pntohs(&pd[offset]);
offset += 2;
strcpy (name_ret, name);
*type_ret = type;
*class_ret = class;
*name_len_ret = name_len;
len = offset - start_offset;
return len;
}
static double
rfc1867_size(u_char val)
{
double size;
guint32 exponent;
size = (val & 0xF0) >> 4;
exponent = (val & 0x0F);
while (exponent != 0) {
size *= 10;
exponent--;
}
return size / 100; /* return size in meters, not cm */
}
static char *
rfc1867_angle(const u_char *dptr, const char *nsew)
{
guint32 angle;
char direction;
guint32 degrees, minutes, secs, tsecs;
static char buf[10+1+3+1 + 2+1+3+1 + 2+1+3+1+3+1 + 1 + 1];
angle = pntohl(dptr);
if (angle < 0x80000000U) {
angle = 0x80000000U - angle;
direction = nsew[1];
} else {
angle = angle - 0x80000000U;
direction = nsew[0];
}
tsecs = angle % 1000;
angle = angle / 1000;
secs = angle % 60;
angle = angle / 60;
minutes = angle % 60;
degrees = angle / 60;
sprintf(buf, "%u deg %u min %u.%03u sec %c", degrees, minutes, secs,
tsecs, direction);
return buf;
}
static int
dissect_dns_query(const u_char *pd, int offset, int dns_data_offset,
frame_data *fd, proto_tree *dns_tree)
{
int len;
char name[MAXDNAME];
int name_len;
int type;
int class;
char *class_name;
char *type_name;
char *long_type_name;
const u_char *dptr;
const u_char *data_start;
proto_tree *q_tree;
proto_item *tq;
data_start = dptr = pd + offset;
len = get_dns_name_type_class(pd, offset, dns_data_offset, name, &name_len,
&type, &class);
if (len < 0) {
/* We ran past the end of the data in the packet. */
return 0;
}
dptr += len;
type_name = dns_type_name(type);
class_name = dns_class_name(class);
long_type_name = dns_long_type_name(type);
if (fd != NULL)
col_append_fstr(fd, COL_INFO, " %s %s", type_name, name);
if (dns_tree != NULL) {
tq = proto_tree_add_text(dns_tree, offset, len, "%s: type %s, class %s",
name, type_name, class_name);
q_tree = proto_item_add_subtree(tq, ett_dns_qd);
proto_tree_add_text(q_tree, offset, name_len, "Name: %s", name);
offset += name_len;
proto_tree_add_text(q_tree, offset, 2, "Type: %s", long_type_name);
offset += 2;
proto_tree_add_text(q_tree, offset, 2, "Class: %s", class_name);
offset += 2;
}
return dptr - data_start;
}
proto_tree *
add_rr_to_tree(proto_item *trr, int rr_type, int offset, const char *name,
int namelen, const char *type_name, const char *class_name, u_int ttl,
u_short data_len)
{
proto_tree *rr_tree;
rr_tree = proto_item_add_subtree(trr, rr_type);
proto_tree_add_text(rr_tree, offset, namelen, "Name: %s", name);
offset += namelen;
proto_tree_add_text(rr_tree, offset, 2, "Type: %s", type_name);
offset += 2;
proto_tree_add_text(rr_tree, offset, 2, "Class: %s", class_name);
offset += 2;
proto_tree_add_text(rr_tree, offset, 4, "Time to live: %s",
time_secs_to_str(ttl));
offset += 4;
proto_tree_add_text(rr_tree, offset, 2, "Data length: %u", data_len);
return rr_tree;
}
/*
* SIG and KEY RR algorithms.
*/
#define DNS_ALGO_MD5 1 /* MD5/RSA */
#define DNS_ALGO_EDATE 253 /* Expiration date */
#define DNS_ALGO_PRIVATE 254 /* Private use */
static const value_string algo_vals[] = {
{ DNS_ALGO_MD5, "MD5/RSA" },
{ DNS_ALGO_EDATE, "Expiration date" },
{ DNS_ALGO_PRIVATE, "Private use" },
{ 0, NULL }
};
static int
dissect_dns_answer(const u_char *pd, int offset, int dns_data_offset,
frame_data *fd, proto_tree *dns_tree)
{
int len;
char name[MAXDNAME];
int name_len;
int type;
int class;
char *class_name;
char *type_name;
char *long_type_name;
const u_char *dptr;
int cur_offset;
const u_char *data_start;
u_int ttl;
u_short data_len;
proto_tree *rr_tree;
proto_item *trr;
data_start = dptr = pd + offset;
cur_offset = offset;
len = get_dns_name_type_class(pd, offset, dns_data_offset, name, &name_len,
&type, &class);
if (len < 0) {
/* We ran past the end of the captured data in the packet. */
return 0;
}
dptr += len;
cur_offset += len;
type_name = dns_type_name(type);
class_name = dns_class_name(class);
long_type_name = dns_long_type_name(type);
if (!BYTES_ARE_IN_FRAME(cur_offset, 4)) {
/* We ran past the end of the captured data in the packet. */
return 0;
}
ttl = pntohl(dptr);
dptr += 4;
cur_offset += 4;
if (!BYTES_ARE_IN_FRAME(cur_offset, 2)) {
/* We ran past the end of the captured data in the packet. */
return 0;
}
data_len = pntohs(dptr);
dptr += 2;
cur_offset += 2;
switch (type) {
case T_A:
if (fd != NULL) {
col_append_fstr(fd, COL_INFO, " %s %s", type_name,
ip_to_str((guint8 *)dptr));
}
if (dns_tree != NULL) {
trr = proto_tree_add_text(dns_tree, offset, (dptr - data_start) + data_len,
"%s: type %s, class %s, addr %s",
name, type_name, class_name,
ip_to_str((guint8 *)dptr));
rr_tree = add_rr_to_tree(trr, ett_dns_rr, offset, name, name_len,
long_type_name, class_name, ttl, data_len);
if (!BYTES_ARE_IN_FRAME(cur_offset, 4)) {
/* We ran past the end of the captured data in the packet. */
return 0;
}
proto_tree_add_text(rr_tree, cur_offset, 4, "Addr: %s",
ip_to_str((guint8 *)dptr));
}
break;
case T_NS:
{
char ns_name[MAXDNAME];
int ns_name_len;
ns_name_len = get_dns_name(pd, cur_offset, dns_data_offset, ns_name, sizeof(ns_name));
if (fd != NULL)
col_append_fstr(fd, COL_INFO, " %s %s", type_name, ns_name);
if (dns_tree != NULL) {
trr = proto_tree_add_text(dns_tree, offset, (dptr - data_start) + data_len,
"%s: type %s, class %s, ns %s",
name, type_name, class_name, ns_name);
rr_tree = add_rr_to_tree(trr, ett_dns_rr, offset, name, name_len,
long_type_name, class_name, ttl, data_len);
if (ns_name_len < 0) {
/* We ran past the end of the captured data in the packet. */
return 0;
}
proto_tree_add_text(rr_tree, cur_offset, ns_name_len, "Name server: %s",
ns_name);
}
}
break;
case T_CNAME:
{
char cname[MAXDNAME];
int cname_len;
cname_len = get_dns_name(pd, cur_offset, dns_data_offset, cname, sizeof(cname));
if (fd != NULL)
col_append_fstr(fd, COL_INFO, " %s %s", type_name, cname);
if (dns_tree != NULL) {
trr = proto_tree_add_text(dns_tree, offset, (dptr - data_start) + data_len,
"%s: type %s, class %s, cname %s",
name, type_name, class_name, cname);
rr_tree = add_rr_to_tree(trr, ett_dns_rr, offset, name, name_len,
long_type_name, class_name, ttl, data_len);
if (cname_len < 0) {
/* We ran past the end of the captured data in the packet. */
return 0;
}
proto_tree_add_text(rr_tree, cur_offset, cname_len, "Primary name: %s",
cname);
}
}
break;
case T_SOA:
{
char mname[MAXDNAME];
int mname_len;
char rname[MAXDNAME];
int rname_len;
guint32 serial;
guint32 refresh;
guint32 retry;
guint32 expire;
guint32 minimum;
mname_len = get_dns_name(pd, cur_offset, dns_data_offset, mname, sizeof(mname));
if (mname_len >= 0)
rname_len = get_dns_name(pd, cur_offset + mname_len, dns_data_offset, rname, sizeof(rname));
else {
/* We ran past the end of the captured data in the packet. */
rname_len = -1;
}
if (fd != NULL)
col_append_fstr(fd, COL_INFO, " %s %s", type_name, mname);
if (dns_tree != NULL) {
trr = proto_tree_add_text(dns_tree, offset, (dptr - data_start) + data_len,
"%s: type %s, class %s, mname %s",
name, type_name, class_name, mname);
rr_tree = add_rr_to_tree(trr, ett_dns_rr, offset, name, name_len,
long_type_name, class_name, ttl, data_len);
if (mname_len < 0) {
/* We ran past the end of the captured data in the packet. */
return 0;
}
proto_tree_add_text(rr_tree, cur_offset, mname_len, "Primary name server: %s",
mname);
cur_offset += mname_len;
if (rname_len < 0) {
/* We ran past the end of the captured data in the packet. */
return 0;
}
proto_tree_add_text(rr_tree, cur_offset, rname_len, "Responsible authority's mailbox: %s",
rname);
cur_offset += rname_len;
if (!BYTES_ARE_IN_FRAME(cur_offset, 4)) {
/* We ran past the end of the captured data in the packet. */
return 0;
}
serial = pntohl(&pd[cur_offset]);
proto_tree_add_text(rr_tree, cur_offset, 4, "Serial number: %u",
serial);
cur_offset += 4;
if (!BYTES_ARE_IN_FRAME(cur_offset, 4)) {
/* We ran past the end of the captured data in the packet. */
return 0;
}
refresh = pntohl(&pd[cur_offset]);
proto_tree_add_text(rr_tree, cur_offset, 4, "Refresh interval: %s",
time_secs_to_str(refresh));
cur_offset += 4;
if (!BYTES_ARE_IN_FRAME(cur_offset, 4)) {
/* We ran past the end of the captured data in the packet. */
return 0;
}
retry = pntohl(&pd[cur_offset]);
proto_tree_add_text(rr_tree, cur_offset, 4, "Retry interval: %s",
time_secs_to_str(retry));
cur_offset += 4;
if (!BYTES_ARE_IN_FRAME(cur_offset, 4)) {
/* We ran past the end of the captured data in the packet. */
return 0;
}
expire = pntohl(&pd[cur_offset]);
proto_tree_add_text(rr_tree, cur_offset, 4, "Expiration limit: %s",
time_secs_to_str(expire));
cur_offset += 4;
if (!BYTES_ARE_IN_FRAME(cur_offset, 4)) {
/* We ran past the end of the captured data in the packet. */
return 0;
}
minimum = pntohl(&pd[cur_offset]);
proto_tree_add_text(rr_tree, cur_offset, 4, "Minimum TTL: %s",
time_secs_to_str(minimum));
}
}
break;
case T_PTR:
{
char pname[MAXDNAME];
int pname_len;
pname_len = get_dns_name(pd, cur_offset, dns_data_offset, pname, sizeof(pname));
if (fd != NULL)
col_append_fstr(fd, COL_INFO, " %s %s", type_name, pname);
if (dns_tree != NULL) {
trr = proto_tree_add_text(dns_tree, offset, (dptr - data_start) + data_len,
"%s: type %s, class %s, ptr %s",
name, type_name, class_name, pname);
rr_tree = add_rr_to_tree(trr, ett_dns_rr, offset, name, name_len,
long_type_name, class_name, ttl, data_len);
if (pname_len < 0) {
/* We ran past the end of the captured data in the packet. */
return 0;
}
proto_tree_add_text(rr_tree, cur_offset, pname_len, "Domain name: %s",
pname);
}
break;
}
break;
case T_HINFO:
{
int cpu_offset;
int cpu_len;
int os_offset;
int os_len;
cpu_offset = cur_offset;
if (!BYTES_ARE_IN_FRAME(cpu_offset, 1)) {
/* We ran past the end of the captured data in the packet. */
if (dns_tree != NULL) {
trr = proto_tree_add_text(dns_tree, offset, (dptr - data_start) + data_len,
"%s: type %s, class %s, <CPU goes past end of captured data in packet>",
name, type_name, class_name);
rr_tree = add_rr_to_tree(trr, ett_dns_rr, offset, name, name_len,
long_type_name, class_name, ttl, data_len);
}
return 0;
}
cpu_len = pd[cpu_offset];
if (!BYTES_ARE_IN_FRAME(cpu_offset + 1, cpu_len)) {
/* We ran past the end of the captured data in the packet. */
if (dns_tree != NULL) {
trr = proto_tree_add_text(dns_tree, offset, (dptr - data_start) + data_len,
"%s: type %s, class %s, <CPU goes past end of captured data in packet>",
name, type_name, class_name);
rr_tree = add_rr_to_tree(trr, ett_dns_rr, offset, name, name_len,
long_type_name, class_name, ttl, data_len);
}
return 0;
}
os_offset = cpu_offset + 1 + cpu_len;
if (!BYTES_ARE_IN_FRAME(os_offset, 1)) {
/* We ran past the end of the captured data in the packet. */
if (dns_tree != NULL) {
trr = proto_tree_add_text(dns_tree, offset, (dptr - data_start) + data_len,
"%s: type %s, class %s, CPU %.*s, <OS goes past end of captured data in packet>",
name, type_name, class_name, cpu_len, &pd[cpu_offset + 1]);
rr_tree = add_rr_to_tree(trr, ett_dns_rr, offset, name, name_len,
long_type_name, class_name, ttl, data_len);
}
return 0;
}
os_len = pd[os_offset];
if (!BYTES_ARE_IN_FRAME(os_offset + 1, os_len)) {
/* We ran past the end of the captured data in the packet. */
if (dns_tree != NULL) {
trr = proto_tree_add_text(dns_tree, offset, (dptr - data_start) + data_len,
"%s: type %s, class %s, CPU %*.s, <OS goes past end of captured data in packet>",
name, type_name, class_name, cpu_len, &pd[cpu_offset + 1]);
rr_tree = add_rr_to_tree(trr, ett_dns_rr, offset, name, name_len,
long_type_name, class_name, ttl, data_len);
}
return 0;
}
if (fd != NULL)
col_append_fstr(fd, COL_INFO, " %s %.*s %.*s", type_name, cpu_len,
&pd[cpu_offset + 1], os_len, &pd[os_offset + 1]);
if (dns_tree != NULL) {
trr = proto_tree_add_text(dns_tree, offset, (dptr - data_start) + data_len,
"%s: type %s, class %s, CPU %.*s, OS %.*s",
name, type_name, class_name,
cpu_len, &pd[cpu_offset + 1], os_len, &pd[os_offset + 1]);
rr_tree = add_rr_to_tree(trr, ett_dns_rr, offset, name, name_len,
long_type_name, class_name, ttl, data_len);
proto_tree_add_text(rr_tree, cpu_offset, 1 + cpu_len, "CPU: %.*s",
cpu_len, &pd[cpu_offset + 1]);
proto_tree_add_text(rr_tree, os_offset, 1 + os_len, "OS: %.*s",
os_len, &pd[os_offset + 1]);
}
break;
}
break;
case T_MX:
{
guint16 preference = 0;
char mx_name[MAXDNAME];
int mx_name_len;
if (!BYTES_ARE_IN_FRAME(cur_offset, 2)) {
/* We ran past the end of the captured data in the packet. */
if (dns_tree != NULL) {
trr = proto_tree_add_text(dns_tree, offset, (dptr - data_start) + data_len,
"%s: type %s, class %s, <preference goes past end of captured data in packet>",
name, type_name, class_name);
rr_tree = add_rr_to_tree(trr, ett_dns_rr, offset, name, name_len,
long_type_name, class_name, ttl, data_len);
}
return 0;
}
preference = pntohs(&pd[cur_offset]);
mx_name_len = get_dns_name(pd, cur_offset + 2, dns_data_offset, mx_name, sizeof(mx_name));
if (mx_name_len < 0) {
/* We ran past the end of the captured data in the packet. */
if (dns_tree != NULL) {
trr = proto_tree_add_text(dns_tree, offset, (dptr - data_start) + data_len,
"%s: type %s, class %s, preference %u, <mx goes past end of captured data in packet>",
name, type_name, class_name, preference);
rr_tree = add_rr_to_tree(trr, ett_dns_rr, offset, name, name_len,
long_type_name, class_name, ttl, data_len);
}
return 0;
}
if (fd != NULL)
col_append_fstr(fd, COL_INFO, " %s %u %s", type_name, preference, mx_name);
if (dns_tree != NULL) {
trr = proto_tree_add_text(dns_tree, offset, (dptr - data_start) + data_len,
"%s: type %s, class %s, preference %u, mx %s",
name, type_name, class_name, preference, mx_name);
rr_tree = add_rr_to_tree(trr, ett_dns_rr, offset, name, name_len,
long_type_name, class_name, ttl, data_len);
proto_tree_add_text(rr_tree, cur_offset, 2, "Preference: %u", preference);
proto_tree_add_text(rr_tree, cur_offset + 2, mx_name_len, "Mail exchange: %s",
mx_name);
}
}
break;
case T_SIG:
{
int rr_len = data_len;
struct timeval unixtime;
char signer_name[MAXDNAME];
int signer_name_len;
if (fd != NULL)
col_append_fstr(fd, COL_INFO, " %s", type_name);
if (dns_tree != NULL) {
trr = proto_tree_add_text(dns_tree, offset, (dptr - data_start) + data_len,
"%s: type %s, class %s",
name, type_name, class_name);
rr_tree = add_rr_to_tree(trr, ett_dns_rr, offset, name, name_len,
long_type_name, class_name, ttl, data_len);
if (!BYTES_ARE_IN_FRAME(cur_offset, 2)) {
/* We ran past the end of the captured data in the packet. */
return 0;
}
proto_tree_add_text(rr_tree, cur_offset, 2, "Type covered: %s (%s)",
dns_type_name(pntohs(&pd[cur_offset])),
dns_long_type_name(pntohs(&pd[cur_offset])));
cur_offset += 2;
rr_len -= 2;
if (!BYTES_ARE_IN_FRAME(cur_offset, 1)) {
/* We ran past the end of the captured data in the packet. */
return 0;
}
proto_tree_add_text(rr_tree, cur_offset, 1, "Algorithm: %s",
val_to_str(pd[cur_offset], algo_vals,
"Unknown (0x%02X)"));
cur_offset += 1;
rr_len -= 1;
if (!BYTES_ARE_IN_FRAME(cur_offset, 1)) {
/* We ran past the end of the captured data in the packet. */
return 0;
}
proto_tree_add_text(rr_tree, cur_offset, 1, "Labels: %u",
pd[cur_offset]);
cur_offset += 1;
rr_len -= 1;
if (!BYTES_ARE_IN_FRAME(cur_offset, 4)) {
/* We ran past the end of the captured data in the packet. */
return 0;
}
proto_tree_add_text(rr_tree, cur_offset, 4, "Original TTL: %s",
time_secs_to_str(pntohl(&pd[cur_offset])));
cur_offset += 4;
rr_len -= 4;
if (!BYTES_ARE_IN_FRAME(cur_offset, 4)) {
/* We ran past the end of the captured data in the packet. */
return 0;
}
unixtime.tv_sec = pntohl(&pd[cur_offset]);
unixtime.tv_usec = 0;
proto_tree_add_text(rr_tree, cur_offset, 4, "Signature expiration: %s",
abs_time_to_str(&unixtime));
cur_offset += 4;
rr_len -= 4;
if (!BYTES_ARE_IN_FRAME(cur_offset, 4)) {
/* We ran past the end of the captured data in the packet. */
return 0;
}
unixtime.tv_sec = pntohl(&pd[cur_offset]);
unixtime.tv_usec = 0;
proto_tree_add_text(rr_tree, cur_offset, 4, "Time signed: %s",
abs_time_to_str(&unixtime));
cur_offset += 4;
rr_len -= 4;
if (!BYTES_ARE_IN_FRAME(cur_offset, 2)) {
/* We ran past the end of the captured data in the packet. */
return 0;
}
proto_tree_add_text(rr_tree, cur_offset, 2, "Key footprint: 0x%04x",
pntohs(&pd[cur_offset]));
cur_offset += 2;