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
|
#ifndef RSPAMD_DNS_H
#define RSPAMD_DNS_H
#include "config.h"
#include "mem_pool.h"
#include "events.h"
#include "upstream.h"
#define MAX_SERVERS 16
#define DNS_D_MAXLABEL 63 /* + 1 '\0' */
#define DNS_D_MAXNAME 255 /* + 1 '\0' */
#define MAX_ADDRS 1
struct rspamd_dns_reply;
struct config_file;
typedef void (*dns_callback_type) (struct rspamd_dns_reply *reply, gpointer arg);
/**
* Implements DNS server
*/
struct rspamd_dns_server {
struct upstream up; /**< upstream structure */
struct in_addr addr; /**< address of DNS server */
gchar *name; /**< name of DNS server */
gint sock; /**< persistent socket */
struct event ev;
};
#define DNS_K_TEA_KEY_SIZE 16
struct dns_k_tea {
guint32 key[DNS_K_TEA_KEY_SIZE / sizeof (guint32)];
guint cycles;
}; /* struct dns_k_tea */
struct dns_k_permutor {
guint stepi, length, limit;
guint shift, mask, rounds;
struct dns_k_tea tea;
};
struct rspamd_dns_resolver {
struct rspamd_dns_server servers[MAX_SERVERS];
gint servers_num; /**< number of DNS servers registered */
GHashTable *requests; /**< requests in flight */
struct dns_k_permutor *permutor; /**< permutor for randomizing request id */
guint request_timeout;
guint max_retransmits;
guint max_errors;
memory_pool_t *static_pool; /**< permament pool (cfg_pool) */
gboolean throttling; /**< dns servers are busy */
guint errors; /**< resolver errors */
struct timeval throttling_time; /**< throttling time */
struct event throttling_event; /**< throttling event */
};
struct dns_header;
struct dns_query;
enum rspamd_request_type {
DNS_REQUEST_A = 0,
DNS_REQUEST_PTR,
DNS_REQUEST_MX,
DNS_REQUEST_TXT,
DNS_REQUEST_SRV,
DNS_REQUEST_SPF
};
struct rspamd_dns_request {
memory_pool_t *pool; /**< pool associated with request */
struct rspamd_dns_resolver *resolver;
struct rspamd_dns_server *server;
dns_callback_type func;
gpointer arg;
struct event timer_event;
struct event io_event;
struct timeval tv;
guint retransmits;
guint16 id;
struct rspamd_async_session *session;
struct rspamd_dns_reply *reply;
guint8 *packet;
const gchar *requested_name;
off_t pos;
guint packet_len;
gint sock;
enum rspamd_request_type type;
time_t time;
};
union rspamd_reply_element {
struct {
struct in_addr addr[MAX_ADDRS];
guint16 addrcount;
} a;
struct {
gchar *name;
} ptr;
struct {
gchar *name;
guint16 priority;
} mx;
struct {
gchar *data;
} txt;
struct {
gchar *data;
} spf;
struct {
guint16 priority;
guint16 weight;
guint16 port;
gchar *target;
} srv;
};
enum dns_rcode {
DNS_RC_NOERROR = 0,
DNS_RC_FORMERR = 1,
DNS_RC_SERVFAIL = 2,
DNS_RC_NXDOMAIN = 3,
DNS_RC_NOTIMP = 4,
DNS_RC_REFUSED = 5,
DNS_RC_YXDOMAIN = 6,
DNS_RC_YXRRSET = 7,
DNS_RC_NXRRSET = 8,
DNS_RC_NOTAUTH = 9,
DNS_RC_NOTZONE = 10,
};
struct rspamd_dns_reply {
enum rspamd_request_type type;
struct rspamd_dns_request *request;
enum dns_rcode code;
GList *elements;
};
/* Internal DNS structs */
struct dns_header {
guint qid:16;
#if __BYTE_ORDER == BIG_ENDIAN
guint qr:1;
guint opcode:4;
guint aa:1;
guint tc:1;
guint rd:1;
guint ra:1;
guint unused:3;
guint rcode:4;
#else
guint rd:1;
guint tc:1;
guint aa:1;
guint opcode:4;
guint qr:1;
guint rcode:4;
guint unused:3;
guint ra:1;
#endif
guint qdcount:16;
guint ancount:16;
guint nscount:16;
guint arcount:16;
};
enum dns_section {
DNS_S_QD = 0x01,
#define DNS_S_QUESTION DNS_S_QD
DNS_S_AN = 0x02,
#define DNS_S_ANSWER DNS_S_AN
DNS_S_NS = 0x04,
#define DNS_S_AUTHORITY DNS_S_NS
DNS_S_AR = 0x08,
#define DNS_S_ADDITIONAL DNS_S_AR
DNS_S_ALL = 0x0f
}; /* enum dns_section */
enum dns_opcode {
DNS_OP_QUERY = 0,
DNS_OP_IQUERY = 1,
DNS_OP_STATUS = 2,
DNS_OP_NOTIFY = 4,
DNS_OP_UPDATE = 5,
}; /* dns_opcode */
enum dns_type {
DNS_T_A = 1,
DNS_T_NS = 2,
DNS_T_CNAME = 5,
DNS_T_SOA = 6,
DNS_T_PTR = 12,
DNS_T_MX = 15,
DNS_T_TXT = 16,
DNS_T_AAAA = 28,
DNS_T_SRV = 33,
DNS_T_SSHFP = 44,
DNS_T_SPF = 99,
DNS_T_ALL = 255
}; /* enum dns_type */
enum dns_class {
DNS_C_IN = 1,
DNS_C_ANY = 255
}; /* enum dns_class */
struct dns_query {
gchar *qname;
guint qtype:16;
guint qclass:16;
};
/* Rspamd DNS API */
struct rspamd_dns_resolver *dns_resolver_init (struct config_file *cfg);
gboolean make_dns_request (struct rspamd_dns_resolver *resolver,
struct rspamd_async_session *session, memory_pool_t *pool, dns_callback_type cb,
gpointer ud, enum rspamd_request_type type, ...);
const gchar *dns_strerror (enum dns_rcode rcode);
const gchar *dns_strtype (enum rspamd_request_type type);
#endif
|
