![Guy Harris](/assets/img/avatar_default.png)
statements. Move the setting of the Protocol column in various dissectors before anything is fetched from the packet, and also clear the Info column at that point in those and some other dissectors, so that if an exception is thrown, the columns don't reflect the previous protocol. Don't use col_add_fstr(..., "%s", string); Use col_add_str(..., string); as it does the same thing, but doesn't drag all the heavy *printf machinery in. Fix the DDTP dissector to set the Info column regardless of whether we're building a protocol tree or not, and to set it to "Encrypted payload" if the payload is encrypted. Also fix a typo in a field name. Register the FTP data dissector as being associated with the FTP data protocol, not the FTP protocol (the removed "CHECK_DISPLAY_AS_DATA()" call checked "proto_ftp_data", and the removed "pinfo->current_proto =" line set it to "FTP-DATA", so it should be associated with "proto_ftp_data"). Make the H1 dissector check whether the frame has at least 2 bytes in it before checking the first two bytes; heuristic dissectors must not throw exceptions until they've accepted the packet as one of theirs. Use "tvb_format_text()" rather than "tvb_get_ptr()" and "format_text()" in some dissectors where the result of "tvb_get_ptr()" is used only in the "format_text()" call. In the Quake dissector, don't check whether there are at least 4 bytes in the packet - if we return, the packet won't be dissected at all (it's not as if some other dissector will get to handle it), and, if we don't return, we'll throw an exception if there aren't at least 4 bytes in the packet, so the packet will be marked as short or malformed, as appropriate. In the RIPng dissector, associate the table of strings for the command field with the command field, so that the dissector doesn't have to format the string for the protocol tree entry itself, and so that the filter construction dialog box can let you select "Request" or "Response" from a list rather than requiring you to know the values for "Request" and "Response". Make "dissect_rpc()" static, as it's called only through a heuristic dissector list. Use "col_set_str()" to set the COL_PROTOCOL column for RPC protocols; the string used is from a table provided by the dissector, and is a string constant. Don't format the Info column for WSP into a buffer and then format that buffer into the column with "%s" - "col_add_fstr()" can do the formatting for you, without having to allocate your own buffer (or run through the *printf machinery twice). Don't fetch fields from the WTP packet until you're ready to use them, so that you don't throw an exception before you even set the Protocol column or clear the Info column. Use "pinfo->destport", not "pi.destport", in the Zebra dissector when checking whether the packet is a request or reply, and do the check by comparing with "pinfo->match_port" rather than TCP_PORT_ZEBRA (so that if the dissector is ever registered on another port, it still correctly determines whether the packet is a request or reply - the Network Monitor HTTP dissector has port 80 wired into its brain, which is a bit irritating if you're trying to get it to dissect HTTP proxy traffic on port 3128 or proxy administration UI traffic on port 3132). svn path=/trunk/; revision=2931
2488 lines
74 KiB
C
2488 lines
74 KiB
C
/* packet-dns.c
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* Routines for DNS packet disassembly
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*
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* $Id: packet-dns.c,v 1.62 2001/01/22 08:03:45 guy Exp $
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*
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* Ethereal - Network traffic analyzer
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* By Gerald Combs <gerald@zing.org>
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* Copyright 1998 Gerald Combs
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*
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#ifdef HAVE_SYS_TYPES_H
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# include <sys/types.h>
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#endif
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#include <stdio.h>
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#include <string.h>
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#include <memory.h>
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#include <glib.h>
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#include "packet.h"
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#include "resolv.h"
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#include "packet-dns.h"
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#include "packet-ip.h"
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static int proto_dns = -1;
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static int hf_dns_response = -1;
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static int hf_dns_query = -1;
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static int hf_dns_flags = -1;
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static int hf_dns_transaction_id = -1;
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static int hf_dns_count_questions = -1;
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static int hf_dns_count_answers = -1;
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static int hf_dns_count_auth_rr = -1;
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static int hf_dns_count_add_rr = -1;
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static gint ett_dns = -1;
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static gint ett_dns_qd = -1;
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static gint ett_dns_rr = -1;
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static gint ett_dns_qry = -1;
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static gint ett_dns_ans = -1;
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static gint ett_dns_flags = -1;
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static gint ett_t_key_flags = -1;
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/* DNS structs and definitions */
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/* Ports used for DNS. */
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#define UDP_PORT_DNS 53
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#define TCP_PORT_DNS 53
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/* Offsets of fields in the DNS header. */
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#define DNS_ID 0
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#define DNS_FLAGS 2
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#define DNS_QUEST 4
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#define DNS_ANS 6
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#define DNS_AUTH 8
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#define DNS_ADD 10
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/* Length of DNS header. */
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#define DNS_HDRLEN 12
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/* type values */
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#define T_A 1 /* host address */
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#define T_NS 2 /* authoritative name server */
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#define T_MD 3 /* mail destination (obsolete) */
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#define T_MF 4 /* mail forwarder (obsolete) */
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#define T_CNAME 5 /* canonical name */
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#define T_SOA 6 /* start of authority zone */
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#define T_MB 7 /* mailbox domain name (experimental) */
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#define T_MG 8 /* mail group member (experimental) */
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#define T_MR 9 /* mail rename domain name (experimental) */
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#define T_NULL 10 /* null RR (experimental) */
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#define T_WKS 11 /* well known service */
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#define T_PTR 12 /* domain name pointer */
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#define T_HINFO 13 /* host information */
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#define T_MINFO 14 /* mailbox or mail list information */
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#define T_MX 15 /* mail routing information */
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#define T_TXT 16 /* text strings */
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#define T_RP 17 /* responsible person (RFC 1183) */
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#define T_AFSDB 18 /* AFS data base location (RFC 1183) */
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#define T_X25 19 /* X.25 address (RFC 1183) */
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#define T_ISDN 20 /* ISDN address (RFC 1183) */
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#define T_RT 21 /* route-through (RFC 1183) */
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#define T_NSAP 22 /* OSI NSAP (RFC 1706) */
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#define T_NSAP_PTR 23 /* PTR equivalent for OSI NSAP (RFC 1348 - obsolete) */
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#define T_SIG 24 /* digital signature (RFC 2535) */
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#define T_KEY 25 /* public key (RFC 2535) */
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#define T_PX 26 /* pointer to X.400/RFC822 mapping info (RFC 1664) */
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#define T_GPOS 27 /* geographical position (RFC 1712) */
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#define T_AAAA 28 /* IPv6 address (RFC 1886) */
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#define T_LOC 29 /* geographical location (RFC 1876) */
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#define T_NXT 30 /* "next" name (RFC 2535) */
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#define T_EID 31 /* ??? (Nimrod?) */
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#define T_NIMLOC 32 /* ??? (Nimrod?) */
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#define T_SRV 33 /* service location (RFC 2052) */
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#define T_ATMA 34 /* ??? */
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#define T_NAPTR 35 /* naming authority pointer (RFC 2168) */
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#define T_KX 36 /* Key Exchange (RFC 2230) */
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#define T_CERT 37 /* Certificate (RFC 2538) */
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#define T_A6 38 /* IPv6 address with indirection (RFC 2874) */
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#define T_DNAME 39 /* Non-terminal DNS name redirection (RFC 2672) */
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#define T_OPT 41 /* OPT pseudo-RR (RFC 2671) */
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#define T_TKEY 249 /* Transaction Key (RFC 2930) */
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#define T_TSIG 250 /* Transaction Signature (RFC 2845) */
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#define T_WINS 65281 /* Microsoft's WINS RR */
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#define T_WINS_R 65282 /* Microsoft's WINS-R RR */
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/* Class values */
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#define C_IN 1 /* the Internet */
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#define C_CS 2 /* CSNET (obsolete) */
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#define C_CH 3 /* CHAOS */
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#define C_HS 4 /* Hesiod */
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#define C_NONE 254 /* none */
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#define C_ANY 255 /* any */
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/* Bit fields in the flags */
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#define F_RESPONSE (1<<15) /* packet is response */
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#define F_OPCODE (0xF<<11) /* query opcode */
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#define F_AUTHORITATIVE (1<<10) /* response is authoritative */
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#define F_TRUNCATED (1<<9) /* response is truncated */
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#define F_RECDESIRED (1<<8) /* recursion desired */
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#define F_RECAVAIL (1<<7) /* recursion available */
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#define F_AUTHENTIC (1<<5) /* authentic data (RFC2535) */
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#define F_CHECKDISABLE (1<<4) /* checking disabled (RFC2535) */
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#define F_RCODE (0xF<<0) /* reply code */
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/* Opcodes */
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#define OPCODE_QUERY (0<<11) /* standard query */
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#define OPCODE_IQUERY (1<<11) /* inverse query */
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#define OPCODE_STATUS (2<<11) /* server status request */
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#define OPCODE_NOTIFY (4<<11) /* zone change notification */
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#define OPCODE_UPDATE (5<<11) /* dynamic update */
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/* Reply codes */
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#define RCODE_NOERROR (0<<0)
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#define RCODE_FORMERR (1<<0)
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#define RCODE_SERVFAIL (2<<0)
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#define RCODE_NXDOMAIN (3<<0)
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#define RCODE_NOTIMPL (4<<0)
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#define RCODE_REFUSED (5<<0)
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#define RCODE_YXDOMAIN (6<<0)
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#define RCODE_YXRRSET (7<<0)
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#define RCODE_NXRRSET (8<<0)
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#define RCODE_NOTAUTH (9<<0)
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#define RCODE_NOTZONE (10<<0)
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static const value_string rcode_vals[] = {
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{ RCODE_NOERROR, "No error" },
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{ RCODE_FORMERR, "Format error" },
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{ RCODE_SERVFAIL, "Server failure" },
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{ RCODE_NXDOMAIN, "No such name" },
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{ RCODE_NOTIMPL, "Not implemented" },
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{ RCODE_REFUSED, "Refused" },
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{ RCODE_YXDOMAIN, "Name exists" },
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{ RCODE_YXRRSET, "RRset exists" },
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{ RCODE_NXRRSET, "RRset does not exist" },
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{ RCODE_NOTAUTH, "Not authoritative" },
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{ RCODE_NOTZONE, "Name out of zone" },
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{ 0, NULL } };
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/* TSIG/TKEY extended errors */
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#define TSIGERROR_BADSIG (16)
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#define TSIGERROR_BADKEY (17)
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#define TSIGERROR_BADTIME (18)
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#define TSIGERROR_BADMODE (19)
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#define TSIGERROR_BADNAME (20)
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#define TSIGERROR_BADALG (21)
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static const value_string tsigerror_vals[] = {
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{ TSIGERROR_BADSIG, "Bad signature" },
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{ TSIGERROR_BADKEY, "Bad key" },
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{ TSIGERROR_BADTIME, "Bad time failure" },
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{ TSIGERROR_BADMODE, "Bad mode such name" },
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{ TSIGERROR_BADNAME, "Bad name implemented" },
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{ TSIGERROR_BADALG, "Bad algorithm" },
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{ 0, NULL } };
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#define TKEYMODE_SERVERASSIGNED (1)
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#define TKEYMODE_DIFFIEHELLMAN (2)
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#define TKEYMODE_GSSAPI (3)
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#define TKEYMODE_RESOLVERASSIGNED (4)
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#define TKEYMODE_DELETE (5)
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/* See RFC 1035 for all RR types for which no RFC is listed, except for
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the ones with "???", and for the Microsoft WINS and WINS-R RRs, for
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which one should look at
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http://www.windows.com/windows2000/en/server/help/sag_DNS_imp_UsingWinsLookup.htm
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and
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http://www.microsoft.com/windows2000/library/resources/reskit/samplechapters/cncf/cncf_imp_wwaw.asp
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which discuss them to some extent. */
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static char *
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dns_type_name (u_int type)
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{
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char *type_names[] = {
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"unused",
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"A",
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"NS",
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"MD",
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"MF",
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"CNAME",
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"SOA",
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"MB",
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"MG",
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"MR",
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"NULL",
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"WKS",
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"PTR",
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"HINFO",
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"MINFO",
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"MX",
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"TXT",
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"RP", /* RFC 1183 */
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"AFSDB", /* RFC 1183 */
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"X25", /* RFC 1183 */
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"ISDN", /* RFC 1183 */
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"RT", /* RFC 1183 */
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"NSAP", /* RFC 1706 */
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"NSAP-PTR", /* RFC 1348 */
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"SIG", /* RFC 2535 */
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"KEY", /* RFC 2535 */
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"PX", /* RFC 1664 */
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"GPOS", /* RFC 1712 */
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"AAAA", /* RFC 1886 */
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"LOC", /* RFC 1876 */
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"NXT", /* RFC 2535 */
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"EID",
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"NIMLOC",
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"SRV", /* RFC 2052 */
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"ATMA",
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"NAPTR", /* RFC 2168 */
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"KX", /* RFC 2230 */
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"CERT", /* RFC 2538 */
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"A6", /* RFC 2874 */
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"DNAME", /* RFC 2672 */
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NULL,
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"OPT" /* RFC 2671 */
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};
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if (type < sizeof(type_names)/sizeof(type_names[0]))
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return type_names[type] ? type_names[type] : "unknown";
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/* special cases */
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switch (type)
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{
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/* non standard */
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case 100:
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return "UINFO";
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case 101:
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return "UID";
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case 102:
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return "GID";
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case 103:
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return "UNSPEC";
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case T_WINS:
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return "WINS";
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case T_WINS_R:
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return "WINS-R";
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/* meta */
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case T_TKEY:
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return "TKEY";
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case T_TSIG:
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return "TSIG";
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/* queries */
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case 251:
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return "IXFR"; /* RFC 1995 */
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case 252:
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return "AXFR";
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case 253:
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return "MAILB";
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case 254:
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return "MAILA";
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case 255:
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return "ANY";
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}
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return "unknown";
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}
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static char *
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dns_long_type_name (u_int type)
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{
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char *type_names[] = {
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"unused",
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"Host address",
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"Authoritative name server",
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"Mail destination",
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"Mail forwarder",
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"Canonical name for an alias",
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"Start of zone of authority",
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"Mailbox domain name",
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"Mail group member",
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"Mail rename domain name",
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"Null resource record",
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"Well-known service description",
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"Domain name pointer",
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"Host information",
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"Mailbox or mail list information",
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"Mail exchange",
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"Text strings",
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"Responsible person", /* RFC 1183 */
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"AFS data base location", /* RFC 1183 */
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"X.25 address", /* RFC 1183 */
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"ISDN number", /* RFC 1183 */
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"Route through", /* RFC 1183 */
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"OSI NSAP", /* RFC 1706 */
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"OSI NSAP name pointer", /* RFC 1348 */
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"Signature", /* RFC 2535 */
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"Public key", /* RFC 2535 */
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"Pointer to X.400/RFC822 mapping info", /* RFC 1664 */
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"Geographical position", /* RFC 1712 */
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"IPv6 address", /* RFC 1886 */
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"Location", /* RFC 1876 */
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"Next", /* RFC 2535 */
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"EID",
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"NIMLOC",
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"Service location", /* RFC 2052 */
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"ATMA",
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"Naming authority pointer", /* RFC 2168 */
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"Key Exchange", /* RFC 2230 */
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"Certificate", /* RFC 2538 */
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"IPv6 address with indirection", /* RFC 2874 */
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"Non-terminal DNS name redirection", /* RFC 2672 */
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NULL,
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"EDNS0 option" /* RFC 2671 */
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};
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static char unkbuf[7+1+2+1+4+1+1+10+1+1]; /* "Unknown RR type (%d)" */
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if (type < sizeof(type_names)/sizeof(type_names[0]))
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return type_names[type] ? type_names[type] : "unknown";
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/* special cases */
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switch (type)
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{
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/* non standard */
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case 100:
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return "UINFO";
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case 101:
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return "UID";
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case 102:
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return "GID";
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case 103:
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return "UNSPEC";
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case T_WINS:
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return "WINS";
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case T_WINS_R:
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return "WINS-R";
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/* meta */
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case T_TKEY:
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return "Transaction Key";
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case T_TSIG:
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return "Transaction Signature";
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/* queries */
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case 251:
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return "Request for incremental zone transfer"; /* RFC 1995 */
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case 252:
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return "Request for full zone transfer";
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case 253:
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return "Request for mailbox-related records";
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case 254:
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return "Request for mail agent resource records";
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case 255:
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return "Request for all records";
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}
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|
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sprintf(unkbuf, "Unknown RR type (%d)", type);
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return unkbuf;
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}
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|
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char *
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dns_class_name(int class)
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{
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char *class_name;
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|
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switch (class) {
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case C_IN:
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class_name = "inet";
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break;
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case C_CS:
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class_name = "csnet";
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break;
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case C_CH:
|
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class_name = "chaos";
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break;
|
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case C_HS:
|
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class_name = "hesiod";
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break;
|
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case C_NONE:
|
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class_name = "none";
|
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break;
|
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case C_ANY:
|
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class_name = "any";
|
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break;
|
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default:
|
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class_name = "unknown";
|
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}
|
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|
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return class_name;
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}
|
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|
|
int
|
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get_dns_name(const u_char *pd, int offset, int dns_data_offset,
|
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char *name, int maxname)
|
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{
|
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const u_char *dp = pd + offset;
|
|
const u_char *dptr = dp;
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char *np = name;
|
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int len = -1;
|
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int chars_processed = 0;
|
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int data_size = pi.len - dns_data_offset;
|
|
u_int component_len;
|
|
|
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maxname--; /* reserve space for the trailing '\0' */
|
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for (;;) {
|
|
if (!BYTES_ARE_IN_FRAME(offset, 1))
|
|
goto overflow;
|
|
component_len = *dp++;
|
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offset++;
|
|
if (component_len == 0)
|
|
break;
|
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chars_processed++;
|
|
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++;
|
|
chars_processed++;
|
|
}
|
|
break;
|
|
|
|
case 0x40:
|
|
/* Extended label (RFC 2673) */
|
|
switch (component_len & 0x3f) {
|
|
|
|
case 0x01:
|
|
/* Bitstring label */
|
|
{
|
|
int bit_count;
|
|
int label_len;
|
|
|
|
bit_count = *dp++;
|
|
label_len = (bit_count - 1) / 8 + 1;
|
|
|
|
np += sprintf(np, "\\[x");
|
|
while(label_len--) {
|
|
np += sprintf(np, "%02x", *dp++);
|
|
}
|
|
np += sprintf(np, "/%d]", bit_count);
|
|
}
|
|
break;
|
|
|
|
default:
|
|
strcpy(name, "<Unknown extended label>");
|
|
/* Parsing will propably fail from here on, since the */
|
|
/* label length is unknown... */
|
|
return dp - dptr;
|
|
}
|
|
break;
|
|
|
|
case 0x80:
|
|
goto error; /* error */
|
|
|
|
case 0xc0:
|
|
/* Pointer. */
|
|
if (!BYTES_ARE_IN_FRAME(offset, 1))
|
|
goto overflow;
|
|
offset = dns_data_offset + (((component_len & ~0xc0) << 8) | (*dp++));
|
|
chars_processed++;
|
|
|
|
/* 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;
|
|
|
|
if (offset >= pi.len) {
|
|
strcpy(name, "<Name contains a pointer that goes past the end of the packet>");
|
|
return len;
|
|
}
|
|
|
|
/* If we've looked at every character in the message, this pointer
|
|
will make us look at some character again, which means we're
|
|
looping. */
|
|
if (chars_processed >= data_size) {
|
|
strcpy(name, "<Name contains a pointer that loops>");
|
|
return len;
|
|
}
|
|
|
|
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, NullTVB, 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, NullTVB, offset, name_len, "Name: %s", name);
|
|
offset += name_len;
|
|
|
|
proto_tree_add_text(q_tree, NullTVB, offset, 2, "Type: %s", long_type_name);
|
|
offset += 2;
|
|
|
|
proto_tree_add_text(q_tree, NullTVB, 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, NullTVB, offset, namelen, "Name: %s", name);
|
|
offset += namelen;
|
|
proto_tree_add_text(rr_tree, NullTVB, offset, 2, "Type: %s", type_name);
|
|
offset += 2;
|
|
proto_tree_add_text(rr_tree, NullTVB, offset, 2, "Class: %s", class_name);
|
|
offset += 2;
|
|
proto_tree_add_text(rr_tree, NullTVB, offset, 4, "Time to live: %s",
|
|
time_secs_to_str(ttl));
|
|
offset += 4;
|
|
proto_tree_add_text(rr_tree, NullTVB, offset, 2, "Data length: %u", data_len);
|
|
return rr_tree;
|
|
}
|
|
|
|
static proto_tree *
|
|
add_opt_rr_to_tree(proto_item *trr, int rr_type, int offset, const char *name,
|
|
int namelen, const char *type_name, int class, 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, NullTVB, offset, namelen, "Name: %s", name);
|
|
offset += namelen;
|
|
proto_tree_add_text(rr_tree, NullTVB, offset, 2, "Type: %s", type_name);
|
|
offset += 2;
|
|
proto_tree_add_text(rr_tree, NullTVB, offset, 2, "UDP payload size: %u",
|
|
class & 0xffff);
|
|
offset += 2;
|
|
proto_tree_add_text(rr_tree, NullTVB, offset, 1, "Higher bits in extended RCODE: 0x%x",
|
|
(ttl >> 24) & 0xff0);
|
|
offset++;
|
|
proto_tree_add_text(rr_tree, NullTVB, offset, 1, "EDNS0 version: %u",
|
|
(ttl >> 16) & 0xff);
|
|
offset++;
|
|
proto_tree_add_text(rr_tree, NullTVB, offset, 2, "Must be zero: 0x%x", ttl & 0xffff);
|
|
offset += 2;
|
|
proto_tree_add_text(rr_tree, NullTVB, offset, 2, "Data length: %u", data_len);
|
|
return rr_tree;
|
|
}
|
|
|
|
/*
|
|
* SIG, KEY, and CERT RR algorithms.
|
|
*/
|
|
#define DNS_ALGO_RSAMD5 1 /* RSA/MD5 */
|
|
#define DNS_ALGO_DH 2 /* Diffie-Hellman */
|
|
#define DNS_ALGO_DSA 3 /* DSA */
|
|
#define DNS_ALGO_ECC 4 /* Elliptic curve crypto */
|
|
#define DNS_ALGO_INDIRECT 252 /* Indirect key */
|
|
#define DNS_ALGO_PRIVATEDNS 253 /* Private, domain name */
|
|
#define DNS_ALGO_PRIVATEOID 254 /* Private, OID */
|
|
|
|
static const value_string algo_vals[] = {
|
|
{ DNS_ALGO_RSAMD5, "RSA/MD5" },
|
|
{ DNS_ALGO_DH, "Diffie-Hellman" },
|
|
{ DNS_ALGO_DSA, "DSA" },
|
|
{ DNS_ALGO_ECC, "Elliptic curve crypto" },
|
|
{ DNS_ALGO_INDIRECT, "Indirect key" },
|
|
{ DNS_ALGO_PRIVATEDNS, "Private, domain name" },
|
|
{ DNS_ALGO_PRIVATEOID, "Private, OID" },
|
|
{ 0, NULL }
|
|
};
|
|
|
|
#define DNS_CERT_PGP 1 /* PGP */
|
|
#define DNS_CERT_PKIX 2 /* PKIX */
|
|
#define DNS_CERT_SPKI 3 /* SPKI */
|
|
#define DNS_CERT_PRIVATEURI 253 /* Private, URI */
|
|
#define DNS_CERT_PRIVATEOID 254 /* Private, OID */
|
|
|
|
static const value_string cert_vals[] = {
|
|
{ DNS_CERT_PGP, "PGP" },
|
|
{ DNS_CERT_PKIX, "PKIX" },
|
|
{ DNS_CERT_SPKI, "SPKI" },
|
|
{ DNS_CERT_PRIVATEURI, "Private, URI" },
|
|
{ DNS_CERT_PRIVATEOID, "Private, OID" },
|
|
{ 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 = NULL;
|
|
proto_item *trr = NULL;
|
|
|
|
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;
|
|
|
|
if (fd != NULL)
|
|
col_append_fstr(fd, COL_INFO, " %s", type_name);
|
|
if (dns_tree != NULL) {
|
|
trr = proto_tree_add_notext(dns_tree, NullTVB, offset,
|
|
(dptr - data_start) + data_len);
|
|
if (type != T_OPT) {
|
|
rr_tree = add_rr_to_tree(trr, ett_dns_rr, offset, name, name_len,
|
|
long_type_name, class_name, ttl, data_len);
|
|
} else {
|
|
rr_tree = add_opt_rr_to_tree(trr, ett_dns_rr, offset, name, name_len,
|
|
long_type_name, class, ttl, data_len);
|
|
}
|
|
}
|
|
|
|
switch (type) {
|
|
|
|
case T_A:
|
|
if (!BYTES_ARE_IN_FRAME(cur_offset, 4)) {
|
|
/* We ran past the end of the captured data in the packet. */
|
|
if (dns_tree != NULL) {
|
|
proto_item_set_text(trr,
|
|
"%s: type %s, class %s, <Address goes past end of captured data in packet>",
|
|
name, type_name, class_name);
|
|
}
|
|
return 0;
|
|
}
|
|
if (fd != NULL)
|
|
col_append_fstr(fd, COL_INFO, " %s", ip_to_str((guint8 *)dptr));
|
|
if (dns_tree != NULL) {
|
|
proto_item_set_text(trr, "%s: type %s, class %s, addr %s",
|
|
name, type_name, class_name,
|
|
ip_to_str((guint8 *)dptr));
|
|
proto_tree_add_text(rr_tree, NullTVB, cur_offset, 4, "Addr: %s",
|
|
ip_to_str((guint8 *)dptr));
|
|
}
|
|
if (class == C_IN) {
|
|
guint32 addr;
|
|
memcpy(&addr, dptr, sizeof(addr));
|
|
add_host_name(addr, name);
|
|
}
|
|
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 (ns_name_len < 0) {
|
|
/* We ran past the end of the captured data in the packet. */
|
|
if (dns_tree != NULL) {
|
|
proto_item_set_text(trr,
|
|
"%s: type %s, class %s, <Nameserver name goes past end of captured data in packet>",
|
|
name, type_name, class_name);
|
|
}
|
|
return 0;
|
|
}
|
|
if (fd != NULL)
|
|
col_append_fstr(fd, COL_INFO, " %s", ns_name);
|
|
if (dns_tree != NULL) {
|
|
proto_item_set_text(trr, "%s: type %s, class %s, ns %s",
|
|
name, type_name, class_name, ns_name);
|
|
proto_tree_add_text(rr_tree, NullTVB, 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 (cname_len < 0) {
|
|
/* We ran past the end of the captured data in the packet. */
|
|
if (dns_tree != NULL) {
|
|
proto_item_set_text(trr,
|
|
"%s: type %s, class %s, <Primary name goes past end of captured data in packet>",
|
|
name, type_name, class_name);
|
|
}
|
|
return 0;
|
|
}
|
|
if (fd != NULL)
|
|
col_append_fstr(fd, COL_INFO, " %s", cname);
|
|
if (dns_tree != NULL) {
|
|
proto_item_set_text(trr, "%s: type %s, class %s, cname %s",
|
|
name, type_name, class_name, cname);
|
|
proto_tree_add_text(rr_tree, NullTVB, 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) {
|
|
/* We ran past the end of the captured data in the packet. */
|
|
if (dns_tree != NULL) {
|
|
proto_item_set_text(trr,
|
|
"%s: type %s, class %s, <mname goes past end of captured data in packet>",
|
|
name, type_name, class_name);
|
|
}
|
|
return 0;
|
|
}
|
|
if (fd != NULL)
|
|
col_append_fstr(fd, COL_INFO, " %s", mname);
|
|
if (dns_tree != NULL) {
|
|
proto_item_set_text(trr, "%s: type %s, class %s, mname %s",
|
|
name, type_name, class_name, mname);
|
|
proto_tree_add_text(rr_tree, NullTVB, cur_offset, mname_len, "Primary name server: %s",
|
|
mname);
|
|
cur_offset += mname_len;
|
|
|
|
rname_len = get_dns_name(pd, cur_offset, dns_data_offset, rname, sizeof(rname));
|
|
if (rname_len < 0) {
|
|
/* We ran past the end of the captured data in the packet. */
|
|
return 0;
|
|
}
|
|
proto_tree_add_text(rr_tree, NullTVB, 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, NullTVB, 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, NullTVB, 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, NullTVB, 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, NullTVB, 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, NullTVB, 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 (pname_len < 0) {
|
|
/* We ran past the end of the captured data in the packet. */
|
|
if (dns_tree != NULL) {
|
|
proto_item_set_text(trr,
|
|
"%s: type %s, class %s, <Domain name goes past end of captured data in packet>",
|
|
name, type_name, class_name);
|
|
}
|
|
return 0;
|
|
}
|
|
if (fd != NULL)
|
|
col_append_fstr(fd, COL_INFO, " %s", pname);
|
|
if (dns_tree != NULL) {
|
|
proto_item_set_text(trr, "%s: type %s, class %s, ptr %s",
|
|
name, type_name, class_name, pname);
|
|
proto_tree_add_text(rr_tree, NullTVB, cur_offset, pname_len, "Domain name: %s",
|
|
pname);
|
|
}
|
|
break;
|
|
}
|
|
break;
|
|
|
|
case T_WKS:
|
|
{
|
|
int rr_len = data_len;
|
|
guint8 protocol;
|
|
guint8 bits;
|
|
int mask;
|
|
int port_num;
|
|
int i;
|
|
char bitnames[128+1];
|
|
char portnumstring[10+1];
|
|
|
|
if (!BYTES_ARE_IN_FRAME(cur_offset, 4)) {
|
|
/* We ran past the end of the captured data in the packet. */
|
|
if (dns_tree != NULL) {
|
|
proto_item_set_text(trr,
|
|
"%s: type %s, class %s, <Address goes past end of captured data in packet>",
|
|
name, type_name, class_name);
|
|
}
|
|
return 0;
|
|
}
|
|
if (fd != NULL)
|
|
col_append_fstr(fd, COL_INFO, " %s", ip_to_str((guint8 *)dptr));
|
|
if (dns_tree != NULL) {
|
|
proto_item_set_text(trr, "%s: type %s, class %s, addr %s",
|
|
name, type_name, class_name,
|
|
ip_to_str((guint8 *)dptr));
|
|
proto_tree_add_text(rr_tree, NullTVB, cur_offset, 4, "Addr: %s",
|
|
ip_to_str((guint8 *)dptr));
|
|
cur_offset += 4;
|
|
rr_len -= 4;
|
|
|
|
if (!BYTES_ARE_IN_FRAME(cur_offset, 1)) {
|
|
/* We ran past the end of the captured data in the packet. */
|
|
proto_tree_add_text(rr_tree, NullTVB, cur_offset, END_OF_FRAME,
|
|
"<Protocol goes past end of captured data in packet>");
|
|
return 0;
|
|
}
|
|
protocol = pd[cur_offset];
|
|
proto_tree_add_text(rr_tree, NullTVB, cur_offset, 1, "Protocol: %s",
|
|
ipprotostr(protocol));
|
|
cur_offset += 1;
|
|
rr_len -= 1;
|
|
|
|
port_num = 0;
|
|
while (rr_len != 0) {
|
|
if (!BYTES_ARE_IN_FRAME(cur_offset, 1)) {
|
|
/* We ran past the end of the captured data in the packet. */
|
|
proto_tree_add_text(rr_tree, NullTVB, cur_offset, END_OF_FRAME,
|
|
"<Bit map goes past end of captured data in packet>");
|
|
return 0;
|
|
}
|
|
bits = pd[cur_offset];
|
|
if (bits != 0) {
|
|
mask = 1<<7;
|
|
bitnames[0] = '\0';
|
|
for (i = 0; i < 8; i++) {
|
|
if (bits & mask) {
|
|
if (bitnames[0] != '\0')
|
|
strcat(bitnames, ", ");
|
|
switch (protocol) {
|
|
|
|
case IP_PROTO_TCP:
|
|
strcat(bitnames, get_tcp_port(port_num));
|
|
break;
|
|
|
|
case IP_PROTO_UDP:
|
|
strcat(bitnames, get_udp_port(port_num));
|
|
break;
|
|
|
|
default:
|
|
sprintf(portnumstring, "%u", port_num);
|
|
strcat(bitnames, portnumstring);
|
|
break;
|
|
}
|
|
}
|
|
mask >>= 1;
|
|
port_num++;
|
|
}
|
|
proto_tree_add_text(rr_tree, NullTVB, cur_offset, 1,
|
|
"Bits: 0x%02x (%s)", bits, bitnames);
|
|
} else
|
|
port_num += 8;
|
|
cur_offset += 1;
|
|
rr_len -= 1;
|
|
}
|
|
}
|
|
}
|
|
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) {
|
|
proto_item_set_text(trr,
|
|
"%s: type %s, class %s, <CPU goes past end of captured data in packet>",
|
|
name, type_name, class_name);
|
|
}
|
|
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) {
|
|
proto_item_set_text(trr,
|
|
"%s: type %s, class %s, <CPU goes past end of captured data in packet>",
|
|
name, type_name, class_name);
|
|
}
|
|
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) {
|
|
proto_item_set_text(trr,
|
|
"%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]);
|
|
}
|
|
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) {
|
|
proto_item_set_text(trr,
|
|
"%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]);
|
|
}
|
|
return 0;
|
|
}
|
|
if (fd != NULL)
|
|
col_append_fstr(fd, COL_INFO, " %.*s %.*s", cpu_len,
|
|
&pd[cpu_offset + 1], os_len, &pd[os_offset + 1]);
|
|
if (dns_tree != NULL) {
|
|
proto_item_set_text(trr,
|
|
"%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]);
|
|
proto_tree_add_text(rr_tree, NullTVB, cpu_offset, 1 + cpu_len, "CPU: %.*s",
|
|
cpu_len, &pd[cpu_offset + 1]);
|
|
proto_tree_add_text(rr_tree, NullTVB, 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) {
|
|
proto_item_set_text(trr,
|
|
"%s: type %s, class %s, <preference goes past end of captured data in packet>",
|
|
name, type_name, class_name);
|
|
}
|
|
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) {
|
|
proto_item_set_text(trr,
|
|
"%s: type %s, class %s, preference %u, <mx goes past end of captured data in packet>",
|
|
name, type_name, class_name, preference);
|
|
}
|
|
return 0;
|
|
}
|
|
if (fd != NULL)
|
|
col_append_fstr(fd, COL_INFO, " %u %s", preference, mx_name);
|
|
if (dns_tree != NULL) {
|
|
proto_item_set_text(trr,
|
|
"%s: type %s, class %s, preference %u, mx %s",
|
|
name, type_name, class_name, preference, mx_name);
|
|
proto_tree_add_text(rr_tree, NullTVB, cur_offset, 2, "Preference: %u", preference);
|
|
proto_tree_add_text(rr_tree, NullTVB, cur_offset + 2, mx_name_len, "Mail exchange: %s",
|
|
mx_name);
|
|
}
|
|
}
|
|
break;
|
|
|
|
case T_TXT:
|
|
{
|
|
int rr_len = data_len;
|
|
int txt_offset;
|
|
int txt_len;
|
|
|
|
if (dns_tree != NULL) {
|
|
proto_item_set_text(trr,
|
|
"%s: type %s, class %s", name, type_name, class_name);
|
|
|
|
txt_offset = cur_offset;
|
|
while (rr_len != 0) {
|
|
if (!BYTES_ARE_IN_FRAME(txt_offset, 1)) {
|
|
/* We ran past the end of the captured data in the packet. */
|
|
proto_tree_add_text(rr_tree, NullTVB, txt_offset, END_OF_FRAME,
|
|
"<String goes past end of captured data in packet>");
|
|
return 0;
|
|
}
|
|
txt_len = pd[txt_offset];
|
|
if (!BYTES_ARE_IN_FRAME(txt_offset + 1, txt_len)) {
|
|
/* We ran past the end of the captured data in the packet. */
|
|
proto_tree_add_text(rr_tree, NullTVB, txt_offset, END_OF_FRAME,
|
|
"<String goes past end of captured data in packet>");
|
|
return 0;
|
|
}
|
|
proto_tree_add_text(rr_tree, NullTVB, txt_offset, 1 + txt_len,
|
|
"Text: %.*s", txt_len, &pd[txt_offset + 1]);
|
|
txt_offset += 1 + txt_len;
|
|
rr_len -= 1 + txt_len;
|
|
}
|
|
}
|
|
}
|
|
break;
|
|
|
|
case T_SIG:
|
|
{
|
|
int rr_len = data_len;
|
|
struct timeval unixtime;
|
|
char signer_name[MAXDNAME];
|
|
int signer_name_len;
|
|
|
|
if (dns_tree != NULL) {
|
|
proto_item_set_text(trr,
|
|
"%s: type %s, class %s", name, type_name, class_name);
|
|
|
|
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, NullTVB, 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, NullTVB, 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, NullTVB, 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, NullTVB, 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, NullTVB, 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, NullTVB, 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, NullTVB, cur_offset, 2, "Key footprint: 0x%04x",
|
|
pntohs(&pd[cur_offset]));
|
|
cur_offset += 2;
|
|
rr_len -= 2;
|
|
|
|
signer_name_len = get_dns_name(pd, cur_offset, dns_data_offset, signer_name, sizeof(signer_name));
|
|
if (signer_name_len < 0) {
|
|
/* We ran past the end of the captured data in the packet. */
|
|
return 0;
|
|
}
|
|
proto_tree_add_text(rr_tree, NullTVB, cur_offset, signer_name_len,
|
|
"Signer's name: %s", signer_name);
|
|
cur_offset += signer_name_len;
|
|
rr_len -= signer_name_len;
|
|
|
|
proto_tree_add_text(rr_tree, NullTVB, cur_offset, rr_len, "Signature");
|
|
}
|
|
}
|
|
break;
|
|
|
|
case T_KEY:
|
|
{
|
|
int rr_len = data_len;
|
|
guint16 flags;
|
|
proto_item *tf;
|
|
proto_tree *flags_tree;
|
|
|
|
if (dns_tree != NULL) {
|
|
proto_item_set_text(trr,
|
|
"%s: type %s, class %s", name, type_name, class_name);
|
|
|
|
if (!BYTES_ARE_IN_FRAME(cur_offset, 2)) {
|
|
/* We ran past the end of the captured data in the packet. */
|
|
return 0;
|
|
}
|
|
flags = pntohs(&pd[cur_offset]);
|
|
tf = proto_tree_add_text(rr_tree, NullTVB, cur_offset, 2, "Flags: 0x%04X", flags);
|
|
flags_tree = proto_item_add_subtree(tf, ett_t_key_flags);
|
|
proto_tree_add_text(flags_tree, NullTVB, cur_offset, 2, "%s",
|
|
decode_boolean_bitfield(flags, 0x8000,
|
|
2*8, "Key prohibited for authentication",
|
|
"Key allowed for authentication"));
|
|
proto_tree_add_text(flags_tree, NullTVB, cur_offset, 2, "%s",
|
|
decode_boolean_bitfield(flags, 0x4000,
|
|
2*8, "Key prohibited for confidentiality",
|
|
"Key allowed for confidentiality"));
|
|
if ((flags & 0xC000) != 0xC000) {
|
|
/* We have a key */
|
|
proto_tree_add_text(flags_tree, NullTVB, cur_offset, 2, "%s",
|
|
decode_boolean_bitfield(flags, 0x2000,
|
|
2*8, "Key is experimental or optional",
|
|
"Key is required"));
|
|
proto_tree_add_text(flags_tree, NullTVB, cur_offset, 2, "%s",
|
|
decode_boolean_bitfield(flags, 0x0400,
|
|
2*8, "Key is associated with a user",
|
|
"Key is not associated with a user"));
|
|
proto_tree_add_text(flags_tree, NullTVB, cur_offset, 2, "%s",
|
|
decode_boolean_bitfield(flags, 0x0200,
|
|
2*8, "Key is associated with the named entity",
|
|
"Key is not associated with the named entity"));
|
|
proto_tree_add_text(flags_tree, NullTVB, cur_offset, 2, "%s",
|
|
decode_boolean_bitfield(flags, 0x0100,
|
|
2*8, "This is the zone key for the specified zone",
|
|
"This is not a zone key"));
|
|
proto_tree_add_text(flags_tree, NullTVB, cur_offset, 2, "%s",
|
|
decode_boolean_bitfield(flags, 0x0080,
|
|
2*8, "Key is valid for use with IPSEC",
|
|
"Key is not valid for use with IPSEC"));
|
|
proto_tree_add_text(flags_tree, NullTVB, cur_offset, 2, "%s",
|
|
decode_boolean_bitfield(flags, 0x0040,
|
|
2*8, "Key is valid for use with MIME security multiparts",
|
|
"Key is not valid for use with MIME security multiparts"));
|
|
proto_tree_add_text(flags_tree, NullTVB, cur_offset, 2, "%s",
|
|
decode_numeric_bitfield(flags, 0x000F,
|
|
2*8, "Signatory = %u"));
|
|
}
|
|
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, NullTVB, cur_offset, 1, "Protocol: %u",
|
|
pd[cur_offset]);
|
|
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, NullTVB, cur_offset, 1, "Algorithm: %s",
|
|
val_to_str(pd[cur_offset], algo_vals,
|
|
"Unknown (0x%02X)"));
|
|
cur_offset += 1;
|
|
rr_len -= 1;
|
|
|
|
proto_tree_add_text(rr_tree, NullTVB, cur_offset, rr_len, "Public key");
|
|
}
|
|
}
|
|
break;
|
|
|
|
case T_AAAA:
|
|
if (!BYTES_ARE_IN_FRAME(cur_offset, 16)) {
|
|
/* We ran past the end of the captured data in the packet. */
|
|
if (dns_tree != NULL) {
|
|
proto_item_set_text(trr,
|
|
"%s: type %s, class %s, <Address goes past end of captured data in packet>",
|
|
name, type_name, class_name);
|
|
}
|
|
return 0;
|
|
}
|
|
if (fd != NULL) {
|
|
col_append_fstr(fd, COL_INFO, " %s",
|
|
ip6_to_str((struct e_in6_addr *)dptr));
|
|
}
|
|
if (dns_tree != NULL) {
|
|
proto_item_set_text(trr, "%s: type %s, class %s, addr %s",
|
|
name, type_name, class_name,
|
|
ip6_to_str((struct e_in6_addr *)dptr));
|
|
proto_tree_add_text(rr_tree, NullTVB, cur_offset, 16, "Addr: %s",
|
|
ip6_to_str((struct e_in6_addr *)dptr));
|
|
}
|
|
break;
|
|
|
|
case T_A6:
|
|
{
|
|
unsigned short pre_len;
|
|
unsigned short suf_len;
|
|
unsigned short suf_octet_count;
|
|
char pname[MAXDNAME];
|
|
int pname_len = 0;
|
|
int a6_offset;
|
|
int suf_offset;
|
|
guint8 suffix[16];
|
|
|
|
a6_offset = cur_offset;
|
|
if (!BYTES_ARE_IN_FRAME(cur_offset, 1)) {
|
|
/* We ran past the end of the captured data in the packet. */
|
|
return 0;
|
|
}
|
|
pre_len = pd[cur_offset++];
|
|
suf_len = 128 - pre_len;
|
|
suf_octet_count = suf_len ? (suf_len - 1) / 8 + 1 : 0;
|
|
if (!BYTES_ARE_IN_FRAME(cur_offset, suf_octet_count)) {
|
|
/* We ran past the end of the captured data in the packet. */
|
|
return 0;
|
|
}
|
|
/* Pad prefix */
|
|
for (suf_offset = 0; suf_offset < 16 - suf_octet_count; suf_offset++) {
|
|
suffix[suf_offset] = 0;
|
|
}
|
|
for (; suf_offset < 16; suf_offset++) {
|
|
suffix[suf_offset] = pd[cur_offset++];
|
|
}
|
|
|
|
if (pre_len > 0) {
|
|
pname_len = get_dns_name(pd, cur_offset, dns_data_offset,
|
|
pname, sizeof(pname));
|
|
if (pname_len < 0) {
|
|
/* We ran past the end of the captured data in the packet. */
|
|
return 0;
|
|
}
|
|
} else {
|
|
strcpy(pname, "");
|
|
}
|
|
|
|
if (fd != NULL) {
|
|
col_append_fstr(fd, COL_INFO, " %d %s %s",
|
|
pre_len,
|
|
ip6_to_str((struct e_in6_addr *)&suffix),
|
|
pname);
|
|
}
|
|
if (dns_tree != NULL) {
|
|
proto_tree_add_text(rr_tree, NullTVB, a6_offset, 1,
|
|
"Prefix len: %u", pre_len);
|
|
a6_offset++;
|
|
if (suf_len) {
|
|
proto_tree_add_text(rr_tree, NullTVB, a6_offset, suf_octet_count,
|
|
"Address suffix: %s",
|
|
ip6_to_str((struct e_in6_addr *)&suffix));
|
|
a6_offset += suf_octet_count;
|
|
}
|
|
if (pre_len > 0) {
|
|
proto_tree_add_text(rr_tree, NullTVB, a6_offset, pname_len,
|
|
"Prefix name: %s", pname);
|
|
}
|
|
proto_item_set_text(trr, "%s: type %s, class %s, addr %d %s %s",
|
|
name,
|
|
type_name,
|
|
class_name,
|
|
pre_len,
|
|
ip6_to_str((struct e_in6_addr *)&suffix),
|
|
pname);
|
|
}
|
|
}
|
|
break;
|
|
|
|
case T_DNAME:
|
|
{
|
|
char dname[MAXDNAME];
|
|
int dname_len;
|
|
|
|
dname_len = get_dns_name(pd, cur_offset, dns_data_offset,
|
|
dname, sizeof(dname));
|
|
if (dname_len < 0) {
|
|
/* We ran past the end of the captured data in the packet. */
|
|
if (dns_tree != NULL) {
|
|
proto_item_set_text(trr,
|
|
"%s: type %s, class %s, <Primary name goes past end of captured data in packet>",
|
|
name, type_name, class_name);
|
|
}
|
|
return 0;
|
|
}
|
|
if (fd != NULL)
|
|
col_append_fstr(fd, COL_INFO, " %s", dname);
|
|
if (dns_tree != NULL) {
|
|
proto_item_set_text(trr, "%s: type %s, class %s, dname %s",
|
|
name, type_name, class_name, dname);
|
|
proto_tree_add_text(rr_tree, NullTVB, cur_offset,
|
|
dname_len, "Target name: %s", dname);
|
|
}
|
|
}
|
|
break;
|
|
|
|
case T_LOC:
|
|
{
|
|
if (dns_tree != NULL) {
|
|
proto_item_set_text(trr,
|
|
"%s: type %s, class %s", name, type_name, class_name);
|
|
|
|
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, NullTVB, cur_offset, 1, "Version: %u", pd[cur_offset]);
|
|
if (pd[cur_offset] == 0) {
|
|
/* Version 0, the only version RFC 1876 discusses. */
|
|
cur_offset++;
|
|
|
|
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, NullTVB, cur_offset, 1, "Size: %g m",
|
|
rfc1867_size(pd[cur_offset]));
|
|
cur_offset++;
|
|
|
|
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, NullTVB, cur_offset, 1, "Horizontal precision: %g m",
|
|
rfc1867_size(pd[cur_offset]));
|
|
cur_offset++;
|
|
|
|
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, NullTVB, cur_offset, 1, "Vertical precision: %g m",
|
|
rfc1867_size(pd[cur_offset]));
|
|
cur_offset++;
|
|
|
|
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, NullTVB, cur_offset, 4, "Latitude: %s",
|
|
rfc1867_angle(&pd[cur_offset], "NS"));
|
|
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;
|
|
}
|
|
proto_tree_add_text(rr_tree, NullTVB, cur_offset, 4, "Longitude: %s",
|
|
rfc1867_angle(&pd[cur_offset], "EW"));
|
|
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;
|
|
}
|
|
proto_tree_add_text(rr_tree, NullTVB, cur_offset, 4, "Altitude: %g m",
|
|
(pntohl(&pd[cur_offset]) - 10000000)/100.0);
|
|
} else
|
|
proto_tree_add_text(rr_tree, NullTVB, cur_offset, data_len, "Data");
|
|
}
|
|
break;
|
|
}
|
|
break;
|
|
|
|
case T_NXT:
|
|
{
|
|
int rr_len = data_len;
|
|
char next_domain_name[MAXDNAME];
|
|
int next_domain_name_len;
|
|
int rr_type;
|
|
guint8 bits;
|
|
int mask;
|
|
int i;
|
|
|
|
next_domain_name_len = get_dns_name(pd, cur_offset, dns_data_offset,
|
|
next_domain_name, sizeof(next_domain_name));
|
|
if (next_domain_name_len < 0) {
|
|
/* We ran past the end of the captured data in the packet. */
|
|
if (dns_tree != NULL) {
|
|
proto_item_set_text(trr,
|
|
"%s: type %s, class %s, <Next domain name goes past end of captured data in packet>",
|
|
name, type_name, class_name);
|
|
}
|
|
return 0;
|
|
}
|
|
if (fd != NULL)
|
|
col_append_fstr(fd, COL_INFO, " %s", next_domain_name);
|
|
if (dns_tree != NULL) {
|
|
proto_item_set_text(trr, "%s: type %s, class %s, next domain name %s",
|
|
name, type_name, class_name, next_domain_name);
|
|
proto_tree_add_text(rr_tree, NullTVB, cur_offset, next_domain_name_len,
|
|
"Next domain name: %s", next_domain_name);
|
|
cur_offset += next_domain_name_len;
|
|
rr_len -= next_domain_name_len;
|
|
rr_type = 0;
|
|
while (rr_len != 0) {
|
|
if (!BYTES_ARE_IN_FRAME(cur_offset, 1)) {
|
|
/* We ran past the end of the captured data in the packet. */
|
|
proto_tree_add_text(rr_tree, NullTVB, cur_offset, END_OF_FRAME,
|
|
"<Bit map goes past end of captured data in packet>");
|
|
return 0;
|
|
}
|
|
bits = pd[cur_offset];
|
|
mask = 1<<7;
|
|
for (i = 0; i < 8; i++) {
|
|
if (bits & mask) {
|
|
proto_tree_add_text(rr_tree, NullTVB, cur_offset, 1,
|
|
"RR type in bit map: %s (%s)",
|
|
dns_type_name(rr_type),
|
|
dns_long_type_name(rr_type));
|
|
}
|
|
mask >>= 1;
|
|
rr_type++;
|
|
}
|
|
cur_offset += 1;
|
|
rr_len -= 1;
|
|
}
|
|
}
|
|
}
|
|
break;
|
|
|
|
case T_KX:
|
|
{
|
|
guint16 preference = 0;
|
|
char kx_name[MAXDNAME];
|
|
int kx_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) {
|
|
proto_item_set_text(trr,
|
|
"%s: type %s, class %s, <preference goes past end of captured data in packet>",
|
|
name, type_name, class_name);
|
|
}
|
|
return 0;
|
|
}
|
|
preference = pntohs(&pd[cur_offset]);
|
|
kx_name_len = get_dns_name(pd, cur_offset + 2, dns_data_offset, kx_name, sizeof(kx_name));
|
|
if (kx_name_len < 0) {
|
|
/* We ran past the end of the captured data in the packet. */
|
|
if (dns_tree != NULL) {
|
|
proto_item_set_text(trr,
|
|
"%s: type %s, class %s, preference %u, <kx goes past end of captured data in packet>",
|
|
name, type_name, class_name, preference);
|
|
}
|
|
return 0;
|
|
}
|
|
if (fd != NULL)
|
|
col_append_fstr(fd, COL_INFO, " %u %s", preference, kx_name);
|
|
if (dns_tree != NULL) {
|
|
proto_item_set_text(trr,
|
|
"%s: type %s, class %s, preference %u, kx %s",
|
|
name, type_name, class_name, preference, kx_name);
|
|
proto_tree_add_text(rr_tree, NullTVB, cur_offset, 2, "Preference: %u", preference);
|
|
proto_tree_add_text(rr_tree, NullTVB, cur_offset + 2, kx_name_len, "Key exchange: %s",
|
|
kx_name);
|
|
}
|
|
}
|
|
break;
|
|
|
|
case T_CERT:
|
|
{
|
|
guint16 cert_type, cert_keytag;
|
|
guint8 cert_keyalg;
|
|
int rr_len = data_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) {
|
|
proto_item_set_text(trr,
|
|
"%s: type %s, class %s, <preference goes past end of captured data in packet>",
|
|
name, type_name, class_name);
|
|
}
|
|
return 0;
|
|
}
|
|
cert_type = pntohs(&pd[cur_offset]);
|
|
cur_offset += 2;
|
|
rr_len -= 2;
|
|
if (!BYTES_ARE_IN_FRAME(cur_offset, 2)) {
|
|
/* We ran past the end of the captured data in the packet. */
|
|
if (dns_tree != NULL) {
|
|
proto_item_set_text(trr,
|
|
"%s: type %s, class %s, <preference goes past end of captured data in packet>",
|
|
name, type_name, class_name);
|
|
}
|
|
return 0;
|
|
}
|
|
cert_keytag = pntohs(&pd[cur_offset]);
|
|
cur_offset += 2;
|
|
rr_len -= 2;
|
|
if (!BYTES_ARE_IN_FRAME(cur_offset, 2)) {
|
|
/* We ran past the end of the captured data in the packet. */
|
|
if (dns_tree != NULL) {
|
|
proto_item_set_text(trr,
|
|
"%s: type %s, class %s, <preference goes past end of captured data in packet>",
|
|
name, type_name, class_name);
|
|
}
|
|
return 0;
|
|
}
|
|
cert_keyalg = pd[cur_offset];
|
|
cur_offset += 1;
|
|
rr_len -= 1;
|
|
|
|
if (dns_tree != NULL) {
|
|
proto_tree_add_text(rr_tree, NullTVB, cur_offset, 1, "Type: %s",
|
|
val_to_str(cert_keyalg, cert_vals,
|
|
"Unknown (0x%02X)"));
|
|
proto_tree_add_text(rr_tree, NullTVB, cur_offset, 2, "Key footprint: 0x%04x",
|
|
cert_keytag);
|
|
proto_tree_add_text(rr_tree, NullTVB, cur_offset, 1, "Algorithm: %s",
|
|
val_to_str(cert_keyalg, algo_vals,
|
|
"Unknown (0x%02X)"));
|
|
proto_tree_add_text(rr_tree, NullTVB, cur_offset, rr_len, "Public key");
|
|
}
|
|
|
|
}
|
|
break;
|
|
|
|
case T_OPT:
|
|
if (dns_tree != NULL) {
|
|
proto_item_set_text(trr, "%s: type %s", name, type_name);
|
|
proto_tree_add_text(rr_tree, NullTVB, cur_offset, data_len, "Data");
|
|
}
|
|
break;
|
|
|
|
case T_TKEY:
|
|
{
|
|
char tkey_algname[MAXDNAME];
|
|
int tkey_algname_len;
|
|
guint16 tkey_mode, tkey_error, tkey_keylen, tkey_otherlen;
|
|
int rr_len = data_len;
|
|
struct timeval unixtime;
|
|
static const value_string tkey_modes[] = {
|
|
{ TKEYMODE_SERVERASSIGNED, "Server assigned" },
|
|
{ TKEYMODE_DIFFIEHELLMAN, "Diffie Hellman" },
|
|
{ TKEYMODE_GSSAPI, "GSSAPI " },
|
|
{ TKEYMODE_RESOLVERASSIGNED, "Resolver assigned" },
|
|
{ TKEYMODE_DELETE, "Delete" },
|
|
{ 0, NULL } };
|
|
|
|
if (dns_tree != NULL) {
|
|
proto_item_set_text(trr,
|
|
"%s: type %s, class %s", name, type_name, class_name);
|
|
tkey_algname_len = get_dns_name(pd, cur_offset, dns_data_offset, tkey_algname, sizeof(tkey_algname));
|
|
if (tkey_algname_len < 0) {
|
|
/* We ran past the end of the captured data in the packet. */
|
|
return 0;
|
|
}
|
|
proto_tree_add_text(rr_tree, NullTVB, cur_offset, tkey_algname_len,
|
|
"Algorithm name: %s", tkey_algname);
|
|
cur_offset += tkey_algname_len;
|
|
rr_len -= tkey_algname_len;
|
|
|
|
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, NullTVB, cur_offset, 4, "Signature inception: %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, NullTVB, cur_offset, 4, "Signature expiration: %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;
|
|
}
|
|
tkey_mode = pntohs(&pd[cur_offset]);
|
|
cur_offset += 2;
|
|
rr_len -= 2;
|
|
proto_tree_add_text(rr_tree, NullTVB, cur_offset, 1, "Mode: %s",
|
|
val_to_str(tkey_mode, tkey_modes,
|
|
"Unknown (0x%02X)"));
|
|
|
|
tkey_error = pntohs(&pd[cur_offset]);
|
|
cur_offset += 2;
|
|
rr_len -= 2;
|
|
|
|
proto_tree_add_text(rr_tree, NullTVB, cur_offset, 4, "Error: %s",
|
|
val_to_str(tkey_error, rcode_vals,
|
|
val_to_str(tkey_error, tsigerror_vals, "Unknown error (%x)")));
|
|
|
|
tkey_keylen = pntohs(&pd[cur_offset]);
|
|
cur_offset += 2;
|
|
rr_len -= 2;
|
|
|
|
if (!BYTES_ARE_IN_FRAME(cur_offset, tkey_keylen)) {
|
|
/* We ran past the end of the captured data in the packet. */
|
|
return 0;
|
|
}
|
|
|
|
proto_tree_add_text(rr_tree, NullTVB, cur_offset, tkey_keylen, "Key");
|
|
cur_offset += tkey_keylen;
|
|
rr_len -= tkey_keylen;
|
|
|
|
tkey_otherlen = pntohs(&pd[cur_offset]);
|
|
cur_offset += 2;
|
|
rr_len -= 2;
|
|
|
|
if (!BYTES_ARE_IN_FRAME(cur_offset, tkey_otherlen)) {
|
|
/* We ran past the end of the captured data in the packet. */
|
|
return 0;
|
|
}
|
|
|
|
proto_tree_add_text(rr_tree, NullTVB, cur_offset, tkey_otherlen, "Other");
|
|
cur_offset += tkey_otherlen;
|
|
rr_len -= tkey_otherlen;
|
|
}
|
|
}
|
|
break;
|
|
|
|
case T_TSIG:
|
|
{
|
|
guint8 tsig_fudge;
|
|
guint16 tsig_originalid, tsig_error, tsig_timehi, tsig_siglen, tsig_otherlen;
|
|
guint32 tsig_timelo;
|
|
char tsig_algname[MAXDNAME];
|
|
int tsig_algname_len;
|
|
struct timeval unixtime;
|
|
int rr_len = data_len;
|
|
|
|
if (dns_tree != NULL) {
|
|
proto_item_set_text(trr,
|
|
"%s: type %s, class %s", name, type_name, class_name);
|
|
tsig_algname_len = get_dns_name(pd, cur_offset, dns_data_offset, tsig_algname, sizeof(tsig_algname));
|
|
if (tsig_algname_len < 0) {
|
|
/* We ran past the end of the captured data in the packet. */
|
|
return 0;
|
|
}
|
|
proto_tree_add_text(rr_tree, NullTVB, cur_offset, tsig_algname_len,
|
|
"Algorithm name: %s", tsig_algname);
|
|
cur_offset += tsig_algname_len;
|
|
rr_len -= tsig_algname_len;
|
|
|
|
if (!BYTES_ARE_IN_FRAME(cur_offset, 6)) {
|
|
/* We ran past the end of the captured data in the packet. */
|
|
return 0;
|
|
}
|
|
|
|
tsig_timehi = pntohs(&pd[cur_offset]);
|
|
cur_offset += 2;
|
|
rr_len -= 2;
|
|
|
|
tsig_timelo = pntohl(&pd[cur_offset]);
|
|
cur_offset += 4;
|
|
rr_len -= 4;
|
|
|
|
unixtime.tv_sec = tsig_timelo;
|
|
unixtime.tv_usec = 0;
|
|
proto_tree_add_text(rr_tree, NullTVB, cur_offset, 6, "Time signed: %s%s",
|
|
abs_time_to_str(&unixtime), tsig_timehi == 0 ? "" : "(high bits set)");
|
|
|
|
if (!BYTES_ARE_IN_FRAME(cur_offset, 2)) {
|
|
/* We ran past the end of the captured data in the packet. */
|
|
return 0;
|
|
}
|
|
|
|
tsig_fudge = pntohs(&pd[cur_offset]);
|
|
cur_offset += 2;
|
|
rr_len -= 2;
|
|
|
|
proto_tree_add_text(rr_tree, NullTVB, cur_offset, 2, "Fudge: %d",
|
|
tsig_fudge);
|
|
|
|
if (!BYTES_ARE_IN_FRAME(cur_offset, 2)) {
|
|
/* We ran past the end of the captured data in the packet. */
|
|
return 0;
|
|
}
|
|
|
|
tsig_siglen = pntohs(&pd[cur_offset]);
|
|
cur_offset += 2;
|
|
rr_len -= 2;
|
|
|
|
if (!BYTES_ARE_IN_FRAME(cur_offset, tsig_siglen)) {
|
|
/* We ran past the end of the captured data in the packet. */
|
|
return 0;
|
|
}
|
|
|
|
proto_tree_add_text(rr_tree, NullTVB, cur_offset, tsig_siglen, "Signature");
|
|
cur_offset += tsig_siglen;
|
|
rr_len -= tsig_siglen;
|
|
|
|
if (!BYTES_ARE_IN_FRAME(cur_offset, 2)) {
|
|
/* We ran past the end of the captured data in the packet. */
|
|
return 0;
|
|
}
|
|
|
|
tsig_originalid = pntohs(&pd[cur_offset]);
|
|
cur_offset += 2;
|
|
rr_len -= 2;
|
|
|
|
proto_tree_add_text(rr_tree, NullTVB, cur_offset, 4, "Original id: %d",
|
|
tsig_originalid);
|
|
|
|
if (!BYTES_ARE_IN_FRAME(cur_offset, 2)) {
|
|
/* We ran past the end of the captured data in the packet. */
|
|
return 0;
|
|
}
|
|
|
|
tsig_error = pntohs(&pd[cur_offset]);
|
|
cur_offset += 2;
|
|
rr_len -= 2;
|
|
|
|
proto_tree_add_text(rr_tree, NullTVB, cur_offset, 4, "Error: %s",
|
|
val_to_str(tsig_error, rcode_vals,
|
|
val_to_str(tsig_error, tsigerror_vals, "Unknown error (%x)")));
|
|
|
|
if (!BYTES_ARE_IN_FRAME(cur_offset, 2)) {
|
|
/* We ran past the end of the captured data in the packet. */
|
|
return 0;
|
|
}
|
|
|
|
tsig_otherlen = pntohs(&pd[cur_offset]);
|
|
cur_offset += 2;
|
|
rr_len -= 2;
|
|
|
|
if (!BYTES_ARE_IN_FRAME(cur_offset, tsig_otherlen)) {
|
|
/* We ran past the end of the captured data in the packet. */
|
|
return 0;
|
|
}
|
|
|
|
proto_tree_add_text(rr_tree, NullTVB, cur_offset, tsig_otherlen, "Other");
|
|
cur_offset += tsig_otherlen;
|
|
rr_len -= tsig_otherlen;
|
|
}
|
|
}
|
|
break;
|
|
|
|
case T_WINS:
|
|
{
|
|
int rr_len = data_len;
|
|
guint32 local_flag;
|
|
guint32 lookup_timeout;
|
|
guint32 cache_timeout;
|
|
guint32 nservers;
|
|
|
|
if (dns_tree != NULL) {
|
|
proto_item_set_text(trr, "%s: type %s, class %s", name, type_name,
|
|
class_name);
|
|
if (!BYTES_ARE_IN_FRAME(cur_offset, 4)) {
|
|
/* We ran past the end of the captured data in the packet. */
|
|
return 0;
|
|
}
|
|
local_flag = pntohl(&pd[cur_offset]);
|
|
if (dns_tree != NULL) {
|
|
proto_tree_add_text(rr_tree, NullTVB, cur_offset, 4, "Local flag: %s",
|
|
local_flag ? "true" : "false");
|
|
}
|
|
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;
|
|
}
|
|
lookup_timeout = pntohl(&pd[cur_offset]);
|
|
if (dns_tree != NULL) {
|
|
proto_tree_add_text(rr_tree, NullTVB, cur_offset, 4, "Lookup timeout: %u seconds",
|
|
lookup_timeout);
|
|
}
|
|
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;
|
|
}
|
|
cache_timeout = pntohl(&pd[cur_offset]);
|
|
if (dns_tree != NULL) {
|
|
proto_tree_add_text(rr_tree, NullTVB, cur_offset, 4, "Cache timeout: %u seconds",
|
|
cache_timeout);
|
|
}
|
|
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;
|
|
}
|
|
nservers = pntohl(&pd[cur_offset]);
|
|
if (dns_tree != NULL) {
|
|
proto_tree_add_text(rr_tree, NullTVB, cur_offset, 4, "Number of WINS servers: %u",
|
|
nservers);
|
|
}
|
|
cur_offset += 4;
|
|
rr_len -= 4;
|
|
|
|
while (rr_len != 0 && nservers != 0) {
|
|
if (!BYTES_ARE_IN_FRAME(cur_offset, 4)) {
|
|
/* We ran past the end of the captured data in the packet. */
|
|
return 0;
|
|
}
|
|
if (dns_tree != NULL) {
|
|
proto_tree_add_text(rr_tree, NullTVB, cur_offset, 4, "WINS server address: %s",
|
|
ip_to_str((guint8 *)&pd[cur_offset]));
|
|
}
|
|
cur_offset += 4;
|
|
rr_len -= 4;
|
|
nservers--;
|
|
}
|
|
}
|
|
}
|
|
break;
|
|
|
|
case T_WINS_R:
|
|
{
|
|
int rr_len = data_len;
|
|
guint32 local_flag;
|
|
guint32 lookup_timeout;
|
|
guint32 cache_timeout;
|
|
char dname[MAXDNAME];
|
|
int dname_len;
|
|
|
|
if (!BYTES_ARE_IN_FRAME(cur_offset, 4)) {
|
|
/* We ran past the end of the captured data in the packet. */
|
|
if (dns_tree != NULL) {
|
|
proto_item_set_text(trr,
|
|
"%s: type %s, class %s, <Local flag goes past end of captured data in packet>",
|
|
name, type_name, class_name);
|
|
}
|
|
return 0;
|
|
}
|
|
local_flag = pntohl(&pd[cur_offset]);
|
|
if (dns_tree != NULL) {
|
|
proto_tree_add_text(rr_tree, NullTVB, cur_offset, 4, "Local flag: %s",
|
|
local_flag ? "true" : "false");
|
|
}
|
|
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. */
|
|
if (dns_tree != NULL) {
|
|
proto_item_set_text(trr,
|
|
"%s: type %s, class %s, <Lookup timeout goes past end of captured data in packet>",
|
|
name, type_name, class_name);
|
|
}
|
|
return 0;
|
|
}
|
|
lookup_timeout = pntohl(&pd[cur_offset]);
|
|
if (dns_tree != NULL) {
|
|
proto_tree_add_text(rr_tree, NullTVB, cur_offset, 4, "Lookup timeout: %u seconds",
|
|
lookup_timeout);
|
|
}
|
|
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. */
|
|
if (dns_tree != NULL) {
|
|
proto_item_set_text(trr,
|
|
"%s: type %s, class %s, <Cache timeout goes past end of captured data in packet>",
|
|
name, type_name, class_name);
|
|
}
|
|
return 0;
|
|
}
|
|
cache_timeout = pntohl(&pd[cur_offset]);
|
|
if (dns_tree != NULL) {
|
|
proto_tree_add_text(rr_tree, NullTVB, cur_offset, 4, "Cache timeout: %u seconds",
|
|
cache_timeout);
|
|
}
|
|
cur_offset += 4;
|
|
rr_len -= 4;
|
|
|
|
dname_len = get_dns_name(pd, cur_offset, dns_data_offset, dname, sizeof(dname));
|
|
if (dname_len < 0) {
|
|
/* We ran past the end of the captured data in the packet. */
|
|
if (dns_tree != NULL) {
|
|
proto_item_set_text(trr,
|
|
"%s: type %s, class %s, <Name result domain goes past end of captured data in packet>",
|
|
name, type_name, class_name);
|
|
}
|
|
return 0;
|
|
}
|
|
if (fd != NULL)
|
|
col_append_fstr(fd, COL_INFO, " %s", dname);
|
|
if (dns_tree != NULL) {
|
|
proto_item_set_text(trr, "%s: type %s, class %s, name result domain %s",
|
|
name, type_name, class_name, dname);
|
|
proto_tree_add_text(rr_tree, NullTVB, cur_offset, dname_len, "Name result domain: %s",
|
|
dname);
|
|
}
|
|
}
|
|
break;
|
|
|
|
/* TODO: parse more record types */
|
|
|
|
default:
|
|
if (dns_tree != NULL) {
|
|
proto_item_set_text(trr,
|
|
"%s: type %s, class %s", name, type_name, class_name);
|
|
proto_tree_add_text(rr_tree, NullTVB, cur_offset, data_len, "Data");
|
|
}
|
|
break;
|
|
}
|
|
|
|
dptr += data_len;
|
|
|
|
return dptr - data_start;
|
|
}
|
|
|
|
static int
|
|
dissect_query_records(const u_char *pd, int cur_off, int dns_data_offset,
|
|
int count, frame_data *fd, proto_tree *dns_tree, int isupdate)
|
|
{
|
|
int start_off, add_off;
|
|
proto_tree *qatree = NULL;
|
|
proto_item *ti = NULL;
|
|
|
|
start_off = cur_off;
|
|
if (dns_tree) {
|
|
char *s = (isupdate ? "Zone" : "Queries");
|
|
ti = proto_tree_add_text(dns_tree, NullTVB, start_off, 0, s);
|
|
qatree = proto_item_add_subtree(ti, ett_dns_qry);
|
|
}
|
|
while (count-- > 0) {
|
|
add_off = dissect_dns_query(pd, cur_off, dns_data_offset, fd, qatree);
|
|
if (add_off <= 0) {
|
|
/* We ran past the end of the captured data in the packet. */
|
|
break;
|
|
}
|
|
cur_off += add_off;
|
|
}
|
|
if (ti)
|
|
proto_item_set_len(ti, cur_off - start_off);
|
|
|
|
return cur_off - start_off;
|
|
}
|
|
|
|
static int
|
|
dissect_answer_records(const u_char *pd, int cur_off, int dns_data_offset,
|
|
int count, frame_data *fd, proto_tree *dns_tree, char *name)
|
|
{
|
|
int start_off, add_off;
|
|
proto_tree *qatree = NULL;
|
|
proto_item *ti = NULL;
|
|
|
|
start_off = cur_off;
|
|
if (dns_tree) {
|
|
ti = proto_tree_add_text(dns_tree, NullTVB, start_off, 0, name);
|
|
qatree = proto_item_add_subtree(ti, ett_dns_ans);
|
|
}
|
|
while (count-- > 0) {
|
|
add_off = dissect_dns_answer(pd, cur_off, dns_data_offset, fd, qatree);
|
|
if (add_off <= 0) {
|
|
/* We ran past the end of the captured data in the packet. */
|
|
break;
|
|
}
|
|
cur_off += add_off;
|
|
}
|
|
if (ti)
|
|
proto_item_set_len(ti, cur_off - start_off);
|
|
|
|
return cur_off - start_off;
|
|
}
|
|
|
|
static void
|
|
dissect_dns(const u_char *pd, int offset, frame_data *fd, proto_tree *tree)
|
|
{
|
|
int dns_data_offset;
|
|
proto_tree *dns_tree = NULL, *field_tree;
|
|
proto_item *ti, *tf;
|
|
guint16 id, flags, quest, ans, auth, add;
|
|
char buf[128+1];
|
|
int cur_off;
|
|
int isupdate;
|
|
static const value_string opcode_vals[] = {
|
|
{ OPCODE_QUERY, "Standard query" },
|
|
{ OPCODE_IQUERY, "Inverse query" },
|
|
{ OPCODE_STATUS, "Server status request" },
|
|
{ OPCODE_NOTIFY, "Zone change notification" },
|
|
{ OPCODE_UPDATE, "Dynamic update" },
|
|
{ 0, NULL } };
|
|
|
|
dns_data_offset = offset;
|
|
|
|
if (check_col(fd, COL_PROTOCOL))
|
|
col_set_str(fd, COL_PROTOCOL, "DNS");
|
|
if (check_col(fd, COL_INFO))
|
|
col_clear(fd, COL_INFO);
|
|
|
|
if (!BYTES_ARE_IN_FRAME(offset, DNS_HDRLEN)) {
|
|
if (check_col(fd, COL_INFO)) {
|
|
col_set_str(fd, COL_INFO, "Short DNS packet");
|
|
}
|
|
old_dissect_data(pd, offset, fd, tree);
|
|
return;
|
|
}
|
|
|
|
/* To do: check for errs, etc. */
|
|
id = pntohs(&pd[offset + DNS_ID]);
|
|
flags = pntohs(&pd[offset + DNS_FLAGS]);
|
|
quest = pntohs(&pd[offset + DNS_QUEST]);
|
|
ans = pntohs(&pd[offset + DNS_ANS]);
|
|
auth = pntohs(&pd[offset + DNS_AUTH]);
|
|
add = pntohs(&pd[offset + DNS_ADD]);
|
|
|
|
if (check_col(fd, COL_INFO)) {
|
|
strcpy(buf, val_to_str(flags & F_OPCODE, opcode_vals, "Unknown operation (%x)"));
|
|
if (flags & F_RESPONSE) {
|
|
strcat(buf, " response");
|
|
if ((flags & F_RCODE) != RCODE_NOERROR) {
|
|
strcat(buf, ", ");
|
|
strcat(buf, val_to_str(flags & F_RCODE, rcode_vals,
|
|
"Unknown error (%x)"));
|
|
}
|
|
}
|
|
col_add_str(fd, COL_INFO, buf);
|
|
} else {
|
|
/* Set "fd" to NULL; we pass a NULL "fd" to the query and answer
|
|
dissectors, as a way of saying that they shouldn't add stuff
|
|
to the COL_INFO column (a call to "check_col(fd, COL_INFO)"
|
|
is more expensive than a check that a pointer isn't NULL). */
|
|
fd = NULL;
|
|
}
|
|
if ((flags & F_OPCODE) == OPCODE_UPDATE)
|
|
isupdate = 1;
|
|
else
|
|
isupdate = 0;
|
|
|
|
if (tree) {
|
|
ti = proto_tree_add_protocol_format(tree, proto_dns, NullTVB, offset, 4,
|
|
"Domain Name System (%s)", (flags & F_RESPONSE) ? "response" : "query");
|
|
|
|
dns_tree = proto_item_add_subtree(ti, ett_dns);
|
|
|
|
if (flags & F_RESPONSE)
|
|
proto_tree_add_boolean_hidden(dns_tree, hf_dns_response, NullTVB, offset, 4, 1);
|
|
else
|
|
proto_tree_add_boolean_hidden(dns_tree, hf_dns_query, NullTVB, offset, 4, 1);
|
|
|
|
proto_tree_add_uint(dns_tree, hf_dns_transaction_id, NullTVB,
|
|
offset + DNS_ID, 2, id);
|
|
|
|
strcpy(buf, val_to_str(flags & F_OPCODE, opcode_vals, "Unknown operation"));
|
|
if (flags & F_RESPONSE) {
|
|
strcat(buf, " response");
|
|
strcat(buf, ", ");
|
|
strcat(buf, val_to_str(flags & F_RCODE, rcode_vals,
|
|
"Unknown error"));
|
|
}
|
|
tf = proto_tree_add_uint_format(dns_tree, hf_dns_flags, NullTVB,
|
|
offset + DNS_FLAGS, 2,
|
|
flags,
|
|
"Flags: 0x%04x (%s)",
|
|
flags, buf);
|
|
field_tree = proto_item_add_subtree(tf, ett_dns_flags);
|
|
proto_tree_add_text(field_tree, NullTVB, offset + DNS_FLAGS, 2, "%s",
|
|
decode_boolean_bitfield(flags, F_RESPONSE,
|
|
2*8, "Response", "Query"));
|
|
proto_tree_add_text(field_tree, NullTVB, offset + DNS_FLAGS, 2, "%s",
|
|
decode_enumerated_bitfield(flags, F_OPCODE,
|
|
2*8, opcode_vals, "%s"));
|
|
if (flags & F_RESPONSE) {
|
|
proto_tree_add_text(field_tree, NullTVB, offset + DNS_FLAGS, 2, "%s",
|
|
decode_boolean_bitfield(flags, F_AUTHORITATIVE,
|
|
2*8,
|
|
"Server is an authority for domain",
|
|
"Server is not an authority for domain"));
|
|
}
|
|
proto_tree_add_text(field_tree, NullTVB, offset + DNS_FLAGS, 2, "%s",
|
|
decode_boolean_bitfield(flags, F_TRUNCATED,
|
|
2*8,
|
|
"Message is truncated",
|
|
"Message is not truncated"));
|
|
proto_tree_add_text(field_tree, NullTVB, offset + DNS_FLAGS, 2, "%s",
|
|
decode_boolean_bitfield(flags, F_RECDESIRED,
|
|
2*8,
|
|
"Do query recursively",
|
|
"Don't do query recursively"));
|
|
if (flags & F_RESPONSE) {
|
|
proto_tree_add_text(field_tree, NullTVB, offset + DNS_FLAGS, 2, "%s",
|
|
decode_boolean_bitfield(flags, F_RECAVAIL,
|
|
2*8,
|
|
"Server can do recursive queries",
|
|
"Server can't do recursive queries"));
|
|
proto_tree_add_text(field_tree, NullTVB, offset + DNS_FLAGS, 2, "%s",
|
|
decode_boolean_bitfield(flags, F_AUTHENTIC,
|
|
2*8,
|
|
"Answer/authority portion was authenticated by the server",
|
|
"Answer/authority portion was not authenticated by the server"));
|
|
}
|
|
if ((flags & F_RESPONSE) == 0) {
|
|
proto_tree_add_text(field_tree, NullTVB, offset + DNS_FLAGS, 2, "%s",
|
|
decode_boolean_bitfield(flags, F_CHECKDISABLE,
|
|
2*8,
|
|
"Non-authenticated data is acceptable",
|
|
"Non-authenticated data is unacceptable"));
|
|
}
|
|
if (flags & F_RESPONSE) {
|
|
proto_tree_add_text(field_tree, NullTVB, offset + DNS_FLAGS, 2, "%s",
|
|
decode_enumerated_bitfield(flags, F_RCODE,
|
|
2*8, rcode_vals, "%s"));
|
|
}
|
|
proto_tree_add_uint(dns_tree, hf_dns_count_questions, NullTVB,
|
|
offset + DNS_QUEST, 2, quest);
|
|
proto_tree_add_uint(dns_tree, hf_dns_count_answers, NullTVB,
|
|
offset + DNS_ANS, 2, ans);
|
|
proto_tree_add_uint(dns_tree, hf_dns_count_auth_rr, NullTVB,
|
|
offset + DNS_AUTH, 2, auth);
|
|
proto_tree_add_uint(dns_tree, hf_dns_count_add_rr, NullTVB,
|
|
offset + DNS_ADD, 2, add);
|
|
|
|
}
|
|
cur_off = offset + DNS_HDRLEN;
|
|
|
|
if (quest > 0) {
|
|
/* If this is a response, don't add information about the queries
|
|
to the summary, just add information about the answers. */
|
|
cur_off += dissect_query_records(pd, cur_off, dns_data_offset, quest,
|
|
(!(flags & F_RESPONSE) ? fd : NULL),
|
|
dns_tree, isupdate);
|
|
}
|
|
|
|
if (ans > 0) {
|
|
/* If this is a request, don't add information about the answers
|
|
to the summary, just add information about the queries. */
|
|
char *s = (isupdate ? "Prerequisites" : "Answers");
|
|
cur_off += dissect_answer_records(pd, cur_off, dns_data_offset, ans,
|
|
((flags & F_RESPONSE) ? fd : NULL),
|
|
dns_tree, s);
|
|
}
|
|
|
|
if (tree) {
|
|
/* Don't add information about the authoritative name servers, or the
|
|
additional records, to the summary. */
|
|
if (auth > 0) {
|
|
char *s = (isupdate ? "Updates" : "Authoritative nameservers");
|
|
cur_off += dissect_answer_records(pd, cur_off, dns_data_offset, auth,
|
|
NULL, dns_tree, s);
|
|
}
|
|
|
|
if (add > 0)
|
|
cur_off += dissect_answer_records(pd, cur_off, dns_data_offset, add,
|
|
NULL, dns_tree, "Additional records");
|
|
}
|
|
}
|
|
|
|
static void
|
|
dissect_dns_tcp(const u_char *pd, int offset, frame_data *fd, proto_tree *tree)
|
|
{
|
|
guint16 plen;
|
|
|
|
if (pi.captured_len < 2)
|
|
return;
|
|
plen = pntohs(&pd[offset]);
|
|
offset += 2;
|
|
if (END_OF_FRAME != plen)
|
|
return;
|
|
dissect_dns(pd, offset, fd, tree);
|
|
}
|
|
|
|
void
|
|
proto_register_dns(void)
|
|
{
|
|
static hf_register_info hf[] = {
|
|
{ &hf_dns_response,
|
|
{ "Response", "dns.response",
|
|
FT_BOOLEAN, BASE_NONE, NULL, 0x0,
|
|
"TRUE if DNS response" }},
|
|
{ &hf_dns_query,
|
|
{ "Query", "dns.query",
|
|
FT_BOOLEAN, BASE_NONE, NULL, 0x0,
|
|
"TRUE if DNS query" }},
|
|
{ &hf_dns_flags,
|
|
{ "Flags", "dns.flags",
|
|
FT_UINT16, BASE_HEX, NULL, 0x0,
|
|
"" }},
|
|
{ &hf_dns_transaction_id,
|
|
{ "Transaction ID", "dns.id",
|
|
FT_UINT16, BASE_HEX, NULL, 0x0,
|
|
"Identification of transaction" }},
|
|
{ &hf_dns_count_questions,
|
|
{ "Questions", "dns.count.queries",
|
|
FT_UINT16, BASE_DEC, NULL, 0x0,
|
|
"Number of queries in packet" }},
|
|
{ &hf_dns_count_answers,
|
|
{ "Answer RRs", "dns.count.answers",
|
|
FT_UINT16, BASE_DEC, NULL, 0x0,
|
|
"Number of answers in packet" }},
|
|
{ &hf_dns_count_auth_rr,
|
|
{ "Authority RRs", "dns.count.auth_rr",
|
|
FT_UINT16, BASE_DEC, NULL, 0x0,
|
|
"Number of authoritative records in packet" }},
|
|
{ &hf_dns_count_add_rr,
|
|
{ "Additional RRs", "dns.count.add_rr",
|
|
FT_UINT16, BASE_DEC, NULL, 0x0,
|
|
"Number of additional records in packet" }}
|
|
};
|
|
static gint *ett[] = {
|
|
&ett_dns,
|
|
&ett_dns_qd,
|
|
&ett_dns_rr,
|
|
&ett_dns_qry,
|
|
&ett_dns_ans,
|
|
&ett_dns_flags,
|
|
&ett_t_key_flags,
|
|
};
|
|
|
|
proto_dns = proto_register_protocol("Domain Name Service", "DNS", "dns");
|
|
proto_register_field_array(proto_dns, hf, array_length(hf));
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
}
|
|
|
|
void
|
|
proto_reg_handoff_dns(void)
|
|
{
|
|
old_dissector_add("udp.port", UDP_PORT_DNS, dissect_dns, proto_dns);
|
|
old_dissector_add("tcp.port", TCP_PORT_DNS, dissect_dns_tcp, proto_dns);
|
|
}
|