summaryrefslogtreecommitdiffstats
path: root/src/dnscap.h
blob: dd03ddd01c8201cec4cf53796648a5c96fdaf989 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
/*
 * Copyright (c) 2016-2021, OARC, Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. Neither the name of the copyright holder nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef __dnscap_dnscap_h
#define __dnscap_dnscap_h

#ifdef __linux__
#define _GNU_SOURCE
#endif

#include <sys/param.h>
#include <sys/types.h>
#include <sys/select.h>
#include <sys/socket.h>
#include <sys/fcntl.h> /* for open() */
#include <sys/ioctl.h> /* for TIOCNOTTY */
#include <stdarg.h>
#include <syslog.h>
#include <dlfcn.h>
#include <sys/stat.h>
#include <sys/resource.h>
#if HAVE_PTHREAD
#include <pthread.h>
#endif

#ifdef __linux__
#define __FAVOR_BSD
#include <net/ethernet.h>
#ifdef USE_SECCOMP
#include <seccomp.h>
#endif
#endif

#ifdef __FreeBSD__
#include <net/ethernet.h>
#endif

#ifdef __NetBSD__
#include <net/ethertypes.h>
#include <net/if.h>
#include <net/if_ether.h>
#endif

#ifdef __OpenBSD__
#include <net/ethertypes.h>
#include <net/if.h>
#include <netinet/in.h>
#include <netinet/in_var.h>
#include <netinet/if_ether.h>
#endif

#ifdef __APPLE__
#include <net/ethernet.h>
#include <net/bpf.h>
#endif

#ifdef __hpux
#include <net/if.h>
#include <netinet/if_ether.h>
#define ETHER_HDR_LEN ETHER_HLEN
#define __BIT_TYPES_DEFINED
#define __HPLX
#endif

#ifdef __SVR4
#include <stdarg.h>
#include <net/if.h>
#include <net/if_arp.h>
#include <netinet/if_ether.h>
#include "snprintf.h"
#define IP_OFFMASK 0x1fff
#define u_int32_t uint32_t
#ifndef ETHER_HDR_LEN
#define ETHER_HDR_LEN 14
#endif
#endif

#ifndef MY_BPFTIMEVAL
#define MY_BPFTIMEVAL timeval
#endif

#include <netinet/in_systm.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <netinet/ip6.h>
#include <netinet/udp.h>
#include <netinet/tcp.h>
#include <arpa/nameser.h>
#if HAVE_ARPA_NAMESER_COMPAT_H
#include <arpa/nameser_compat.h>
#endif
#include <arpa/inet.h>

#include <assert.h>
#include <errno.h>
#include <netdb.h>
#include <pcap.h>
#include <regex.h>
#include <signal.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <pwd.h>
#include <grp.h>

#if HAVE_ZLIB_H
#include <zlib.h>
#endif

#include <ldns/ldns.h>

#ifndef IPV6_VERSION
#define IPV6_VERSION 0x60
#endif
#ifndef IPV6_VERSION_MASK
#define IPV6_VERSION_MASK 0xf0
#endif

#define UDP10_QR_MASK 0x80
#define UDP10_QR_SHIFT 7
#define UDP10_OP_MASK 0x78
#define UDP10_OP_SHIFT 3
#define UDP10_AA_MASK 0x04
#define UDP10_AA_SHIFT 2
#define UDP10_TC_MASK 0x02
#define UDP10_TC_SHIFT 1
#define UDP10_RD_MASK 0x01
#define UDP10_RD_SHIFT 0

#define UDP11_RC_MASK 0x0f
#define UDP11_RC_SHIFT 0

#define MSG_QUERY 0x0001
#define MSG_UPDATE 0x0002
#define MSG_NOTIFY 0x0004

#define ERR_TRUNC 0x0001
#define ERR_RCODE_BASE 0x0002
#define ERR_NO (ERR_RCODE_BASE << 0)
#define ERR_FORMERR (ERR_RCODE_BASE << 1)
#define ERR_SERVFAIL (ERR_RCODE_BASE << 2)
#define ERR_NXDOMAIN (ERR_RCODE_BASE << 3)
#define ERR_NOTIMPL (ERR_RCODE_BASE << 4)
#define ERR_REFUSED (ERR_RCODE_BASE << 5)
#define ERR_YES (0xffffffff & ~ERR_NO)

#define END_INITIATOR 0x0001
#define END_RESPONDER 0x0002

#define HIDE_INET "\177\177\177\177"
#define HIDE_INET6 "\177\177\177\177\177\177\177\177" \
                   "\177\177\177\177\177\177\177\177"
#define HIDE_PORT 54321

#ifndef ETHERTYPE_VLAN
#define ETHERTYPE_VLAN 0x8100
#endif
#ifndef ETHERTYPE_IPV6
#define ETHERTYPE_IPV6 0x86DD
#endif

#define THOUSAND 1000
#define MILLION (THOUSAND * THOUSAND)
#define MAX_VLAN 4095
#define DNS_PORT 53
#define TO_MS 1
#define SNAPLEN 65536
#define TRUE 1
#define FALSE 0
#define REGEX_CFLAGS (REG_EXTENDED | REG_ICASE | REG_NOSUB | REG_NEWLINE)
#define MAX_TCP_WINDOW (0xFFFF << 14)
#define MEM_MAX 20000000000 /* SETTING MAX MEMORY USAGE TO 2GB */

#define ISC_CHECK_NONE 1
#include "isc/list.h"
#include "isc/assertions.h"

#include "dnscap_common.h"

#include "dump_dns.h"
#include "dump_cbor.h"
#include "dump_cds.h"
#include "options.h"
#include "pcap-thread/pcap_thread.h"

struct text {
    LINK(struct text)
    link;
    size_t len;
    char*  text;
};
typedef struct text* text_ptr;
typedef LIST(struct text) text_list;
#define text_size(len) (sizeof(struct text) + len)

struct mypcap {
    LINK(struct mypcap)
    link;
    const char*      name;
    struct pcap_stat ps0, ps1;
    uint64_t         drops;
};
typedef struct mypcap* mypcap_ptr;
typedef LIST(struct mypcap) mypcap_list;

struct vlan {
    LINK(struct vlan)
    link;
    unsigned vlan;
};
typedef struct vlan* vlan_ptr;
typedef LIST(struct vlan) vlan_list;

#define MAX_TCP_WINDOW_SIZE (0xFFFF << 14)
#define MAX_TCP_MSGS 8
#define MAX_TCP_SEGS 8
#define MAX_TCP_HOLES 8
#define MAX_TCP_DNS_MSG 8

typedef struct tcphole    tcphole_t;
typedef struct tcp_msgbuf tcp_msgbuf_t;
typedef struct tcp_segbuf tcp_segbuf_t;
typedef struct tcpdnsmsg  tcpdnsmsg_t;
typedef struct tcpreasm   tcpreasm_t;

struct tcphole {
    uint16_t start;
    uint16_t len;
};

struct tcp_msgbuf {
    uint32_t  seq;
    uint16_t  dnslen;
    tcphole_t hole[MAX_TCP_HOLES];
    int       holes;
    u_char    buf[];
};

struct tcp_segbuf {
    uint32_t seq;
    uint16_t len;
    u_char   buf[];
};

struct tcpdnsmsg {
    size_t   segments_seen;
    uint16_t dnslen;
    u_char   dnspkt[];
};

struct tcpreasm {
    uint32_t      seq_start;
    size_t        msgbufs;
    u_char        dnslen_buf[2];
    u_char        dnslen_bytes_seen_mask;
    tcp_msgbuf_t* msgbuf[MAX_TCP_MSGS];
    tcp_segbuf_t* segbuf[MAX_TCP_SEGS];
    size_t        segments_seen;
    size_t        dnsmsgs;
    tcpdnsmsg_t*  dnsmsg[MAX_TCP_DNS_MSG];
    uint32_t      seq_bfb;
    tcp_segbuf_t* bfb_seg[MAX_TCP_SEGS];
    u_char*       bfb_buf;
    size_t        bfb_at;
};

struct tcpstate {
    LINK(struct tcpstate)
    link;
    iaddr    saddr;
    iaddr    daddr;
    uint16_t sport;
    uint16_t dport;
    uint32_t start; /* seq# of tcp payload start */
    uint32_t maxdiff; /* maximum (seq# - start) */
    uint16_t dnslen;
    time_t   last_use;
    uint32_t lastdns;
    uint32_t currseq;
    size_t   currlen;

    tcpreasm_t* reasm;
    size_t      reasm_faults;
};
typedef struct tcpstate* tcpstate_ptr;
typedef LIST(struct tcpstate) tcpstate_list;

struct endpoint {
    LINK(struct endpoint)
    link;
    iaddr ia;
};
typedef struct endpoint* endpoint_ptr;
typedef LIST(struct endpoint) endpoint_list;

struct myregex {
    LINK(struct myregex)
    link;
    regex_t reg;
    char*   str;
    int not ;
};
typedef struct myregex* myregex_ptr;
typedef LIST(struct myregex) myregex_list;

struct plugin {
    LINK(struct plugin)
    link;

    char*            name;
    void*            handle;
    enum plugin_type pt;

    type_t(*type);
    int (*start)(logerr_t*);
    void (*stop)();
    int (*open)(my_bpftimeval);
    int (*close)();
    output_t(*output);
    filter_t(*filter);
    void (*getopt)(int*, char**[]);
    void (*usage)();
    void (*extension)(int, void*);
};
typedef LIST(struct plugin) plugin_list;

enum dump_type {
    nowhere,
    to_stdout,
    to_file
};
enum dump_state {
    dumper_opened,
    dumper_closed
};

extern plugin_list plugins;
extern const char* ProgramName;
extern char*       dump_suffix;
extern int         wantgzip;

extern plugin_list     plugins;
extern const char*     ProgramName;
extern int             dumptrace;
extern int             flush;
extern vlan_list       vlans_excl;
extern vlan_list       vlans_incl;
extern unsigned        msg_wanted;
extern unsigned        dir_wanted;
extern unsigned        end_hide;
extern unsigned        err_wanted;
extern tcpstate_list   tcpstates;
extern int             tcpstate_count;
extern endpoint_list   initiators, not_initiators;
extern endpoint_list   responders, not_responders;
extern endpoint_list   drop_responders;
extern myregex_list    myregexes;
extern mypcap_list     mypcaps;
extern mypcap_ptr      pcap_offline;
extern const char*     dump_base;
extern char*           dump_suffix;
extern char*           extra_bpf;
extern enum dump_type  dump_type;
extern enum dump_state dump_state;
extern const char*     kick_cmd;
extern unsigned        limit_seconds;
extern time_t          next_interval;
extern unsigned        limit_packets;
extern size_t          limit_pcapfilesize;
extern pcap_t*         pcap_dead;
extern pcap_dumper_t*  dumper;
extern time_t          dumpstart;
extern unsigned        msgcount;
extern size_t          capturedbytes;
extern char *          dumpname, *dumpnamepart;
extern char*           bpft;
extern unsigned        dns_port;
extern int             promisc;
extern int             monitor_mode;
extern int             immediate_mode;
extern int             background;
extern char            errbuf[PCAP_ERRBUF_SIZE];
extern int             wantgzip;
extern int             wantfrags;
extern int             wanticmp;
extern int             wanttcp;
extern int             preso;
#ifdef USE_SECCOMP
extern int use_seccomp;
#endif
extern int                main_exit;
extern int                alarm_set;
extern time_t             start_time;
extern time_t             stop_time;
extern int                print_pcap_stats;
extern uint64_t           pcap_drops;
extern my_bpftimeval      last_ts;
extern unsigned long long mem_limit;
extern int                mem_limit_set;
extern const char         DROPTOUSER[];
extern pcap_thread_t      pcap_thread;
extern int                only_offline_pcaps;
extern int                dont_drop_privileges;
extern options_t          options;

extern ldns_rr_type match_qtype, nmatch_qtype;

#endif /* __dnscap_dnscap_h */