File size: 7,792 Bytes
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** This file is a part of PassiveDNS.
**
** Copyright (C) 2010-2013, Edward Fjellskål <edwardfjellskaal@gmail.com>
**
** This program is free software; you can redistribute it and/or modify
** it under the terms of the GNU General Public License as published by
** the Free Software Foundation; either version 2 of the License, or
** (at your option) any later version.
**
** This program is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
** GNU General Public License for more details.
**
** You should have received a copy of the GNU General Public License
** along with this program; if not, write to the Free Software
** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
**
*/
#ifndef DNS_H
#define DNS_H
#include <ldns/ldns.h>
/* Default flags for types to handle */
#define DNS_CHK_AAAA 0x00000001
#define DNS_CHK_A 0x00000002
#define DNS_CHK_PTR 0x00000004
#define DNS_CHK_CNAME 0x00000008
#define DNS_CHK_DNAME 0x00000010
#define DNS_CHK_NAPTR 0x00000020
#define DNS_CHK_RP 0x00000040
#define DNS_CHK_SRV 0x00000080
#define DNS_CHK_TXT 0x00000100
#define DNS_CHK_SOA 0x00000200
#define DNS_CHK_MX 0x00000400
#define DNS_CHK_NS 0x00000800
#define DNS_CHK_DNSSEC 0x00001000
#define DNS_CHK_LOC 0x00002000
#define DNS_CHK_SPF 0x00004000
#define DNS_CHK_SSHFP 0x00008000
#define DNS_CHK_HINFO 0x00010000
#define DNS_CHK_ALL 0x80000000
/* Default flags for Server Errors to handle */
#define DNS_SE_CHK_FORMERR 0x0001
#define DNS_SE_CHK_SERVFAIL 0x0002
#define DNS_SE_CHK_NXDOMAIN 0x0004
#define DNS_SE_CHK_NOTIMPL 0x0008
#define DNS_SE_CHK_REFUSED 0x0010
#define DNS_SE_CHK_YXDOMAIN 0x0020
#define DNS_SE_CHK_YXRRSET 0x0040
#define DNS_SE_CHK_NXRRSET 0x0080
#define DNS_SE_CHK_NOTAUTH 0x0100
#define DNS_SE_CHK_NOTZONE 0x0200
#define DNS_SE_CHK_ALL 0x8000
/* Flag for indicating an NXDOMAIN */
#define DNS_NXDOMAIN 0x01
/* Flags for which fields to print */
#define FIELD_TIMESTAMP_S 0x00001
#define FIELD_TIMESTAMP_MS 0x00002
#define FIELD_CLIENT 0x00004
#define FIELD_SERVER 0x00008
#define FIELD_CLASS 0x00010
#define FIELD_QUERY 0x00020
#define FIELD_TYPE 0x00040
#define FIELD_ANSWER 0x00080
#define FIELD_TTL 0x00100
#define FIELD_COUNT 0x00200
#define FIELD_TIMESTAMP_YMDHMS 0x00400
#define FIELD_PROTO 0x00800
#define FIELD_HOSTNAME 0x01000
#define FIELD_QUERY_LEN 0x02000
#define FIELD_ANSWER_LEN 0x04000
#define FIELD_CLT_HWADDR 0x08000
#define FIELD_SRV_HWADDR 0x10000
/* Static values for print_passet() */
#define PASSET_ERR_TTL 0
#define PASSET_ERR_COUNT 1
/* Syslog */
#define PDNS_IDENT "passivedns"
/* JSON fields used when printing PDNS */
#define JSON_TIMESTAMP "timestamp"
#define JSON_TIMESTAMP_S "timestamp_s"
#define JSON_TIMESTAMP_MS "timestamp_ms"
#define JSON_CLIENT "client"
#define JSON_SERVER "server"
#define JSON_PROTO "proto"
#define JSON_CLASS "class"
#define JSON_QUERY "query"
#define JSON_QUERY_LEN "query_len"
#define JSON_TYPE "type"
#define JSON_ANSWER "answer"
#define JSON_ANSWER_LEN "answer_len"
#define JSON_TTL "ttl"
#define JSON_COUNT "count"
#define JSON_HOSTNAME "hostname"
/* To avoid spaming the logfile with duplicate dns info
* we only print a dns record one time each 24H. This way
* you will get a last seen timestamp update once a day
* at least. If the record changes, it will be classified
* as a new record, and printent. If a record expires and
* it has been updated since last_print time, it will be
* printed again.
*/
#define DNSPRINTTIME 86400 /* 24H = 86400 sec */
/* How long we should hold a dns record in our internal
* cache. It should preferably not be less than DNSPRINTTIME,
* as that will make it possible to get more than one instance
* of the record each day in the logfile. That said, setting
* DNSCACHETIMEOUT to DNSPRINTTIME/2 etc, might help memory
* usage if that is a concern AND you probably will get a better
* granularity on the DNS time stamps in the log file.
* My recomendations are DNSPRINTTIME == 24h and
* DNSCACHETIMEOUT == 12h.
*/
#define DNSCACHETIMEOUT 43200 /* 12h=43200sec */
/* HASH:
* [DOMAIN_HASH_BUCKET]_
* |__[Q-TYPE_BUCKET]_<--- PTR,MX,A...
* |__[RESPONCE-NAME] <--- FOR PTR is the IPv4/IPv6
*/
typedef struct _pdns_asset {
struct timeval first_seen; /* First seen (unix timestamp) */
struct timeval last_seen; /* Last seen (unix timestamp) */
struct timeval last_print; /* Last time asset was printet */
struct ldns_struct_rr *rr; /* PTR,MX,TXT,A,AAAA... */
uint64_t seen; /* Number of times seen */
unsigned char *answer; /* Answer, like 8.8.8.8 or 2001:67c:21e0::16 */
uint32_t af; /* IP version (4/6) AF_INET */
struct in6_addr sip; /* DNS Server IP (v4/6) */
u_char smac[6]; /* DNS Server MAC address */
struct in6_addr cip; /* DNS Client IP (v4/6) */
u_char cmac[6]; /* DNS Client MAC address */
struct _pdns_asset *next; /* Next dns asset */
struct _pdns_asset *prev; /* Prev dns asset */
} pdns_asset;
typedef struct _pdns_record {
struct timeval first_seen; /* First seen (unix timestamp) */
struct timeval last_seen; /* Last seen (unix timestamp) */
struct timeval last_print; /* Last time record(NXD) was printet */
uint64_t seen; /* Number of times seen */
unsigned char *qname; /* Query name (gamelinux.org) */
uint8_t nxflag; /* Flag to indicate if this is a NXDOMAIN */
uint32_t af; /* IP version (4/6) AF_INET */
struct in6_addr sip; /* DNS Server IP (v4/6) */
u_char smac[6]; /* DNS Server MAC address */
struct in6_addr cip; /* DNS Client IP (v4/6) */
u_char cmac[6]; /* DNS Client MAC address */
uint8_t proto; /* Protocol */
pdns_asset *passet; /* Head of dns assets */
struct _pdns_record *next; /* Next dns record */
struct _pdns_record *prev; /* Prev dns record */
} pdns_record;
/* Declare */
int process_dns_answer (packetinfo *pi, ldns_pkt *decoded_dns);
int cache_dns_objects (packetinfo *pi, ldns_rdf *rdf_data, ldns_buffer *buff, ldns_pkt *dns_pkt);
pdns_record *get_pdns_record (uint64_t dnshash, packetinfo *pi, unsigned char *domain_name);
const char *u_ntop (const struct in6_addr ip_addr, int af, char *dest);
void dns_parser (packetinfo *pi);
void update_pdns_record_asset (packetinfo *pi, pdns_record *pr, ldns_rr *rr, unsigned char *rdomain_name);
void print_passet (pdns_record *l, pdns_asset *p, ldns_rr *rr, ldns_rdf *lname, uint16_t rcode);
void expire_dns_assets (pdns_record *pdnsr, time_t expire_t);
void expire_dns_records();
void expire_all_dns_records();
void delete_dns_record (pdns_record *pdnsr, pdns_record **bucket_ptr);
void delete_dns_asset (pdns_asset **passet_head, pdns_asset *passet);
void update_config_mem_counters();
void parse_field_flags (char *args);
void parse_dns_flags (char *args);
void update_dns_stats(packetinfo *pi, uint8_t code);
uint16_t pdns_chk_dnsfe(uint16_t rcode);
#endif /* DNS_H */
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