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
|
/*
* Copyright (c) 2009-2013, Vsevolod Stakhov
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * 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.
*
* THIS SOFTWARE IS PROVIDED BY AUTHOR ''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 AUTHOR 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.
*/
#include "config.h"
#include "dns.h"
#include "main.h"
#include "utlist.h"
#include "uthash.h"
#include "rdns_event.h"
struct rspamd_dns_resolver {
struct rdns_resolver *r;
struct event_base *ev_base;
gdouble request_timeout;
guint max_retransmits;
};
struct rspamd_dns_request_ud {
struct rspamd_async_session *session;
dns_callback_type cb;
gpointer ud;
struct rdns_request *req;
};
static void
rspamd_dns_fin_cb (gpointer arg)
{
struct rdns_request *req = arg;
rdns_request_release (req);
}
static void
rspamd_dns_callback (struct rdns_reply *reply, gpointer ud)
{
struct rspamd_dns_request_ud *reqdata = ud;
reqdata->cb (reply, reqdata->ud);
remove_normal_event (reqdata->session, rspamd_dns_fin_cb, reqdata->req);
}
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 rdns_request_type type, const char *name)
{
struct rdns_request *req;
struct rspamd_dns_request_ud *reqdata;
reqdata = memory_pool_alloc (pool, sizeof (struct rspamd_dns_request_ud));
reqdata->session = session;
reqdata->cb = cb;
reqdata->ud = ud;
req = rdns_make_request_full (resolver->r, rspamd_dns_callback, reqdata,
resolver->request_timeout, resolver->max_retransmits, 1, name, type);
if (req != NULL) {
register_async_event (session, (event_finalizer_t)rspamd_dns_fin_cb, req,
g_quark_from_static_string ("dns resolver"));
/* Ref event to free it only when according async event is deleted from the session */
rdns_request_retain (req);
reqdata->req = req;
}
else {
return FALSE;
}
return TRUE;
}
struct rspamd_dns_resolver *
dns_resolver_init (rspamd_logger_t *logger, struct event_base *ev_base, struct config_file *cfg)
{
GList *cur;
struct rspamd_dns_resolver *new;
gchar *begin, *p, *err;
gint priority;
new = g_slice_alloc0 (sizeof (struct rspamd_dns_resolver));
new->ev_base = ev_base;
new->request_timeout = cfg->dns_timeout;
new->max_retransmits = cfg->dns_retransmits;
new->r = rdns_resolver_new ();
rdns_bind_libevent (new->r, new->ev_base);
rdns_resolver_set_log_level (new->r, cfg->log_level);
rdns_resolver_set_logger (new->r, (rdns_log_function)rspamd_common_logv, logger);
if (cfg->nameservers == NULL) {
/* Parse resolv.conf */
if (!rdns_resolver_parse_resolv_conf (new->r, "/etc/resolv.conf")) {
msg_err ("cannot parse resolv.conf and no nameservers defined, so no ways to resolve addresses");
return new;
}
}
else {
cur = cfg->nameservers;
while (cur) {
begin = cur->data;
p = strchr (begin, ':');
if (p != NULL) {
*p = '\0';
p ++;
priority = strtoul (p, &err, 10);
if (err != NULL && *err != '\0') {
msg_info ("bad character '%x', must be 'm' or 's' or a numeric priority", *err);
}
}
else {
priority = 0;
}
if (!rdns_resolver_add_server (new->r, begin, 53, priority, cfg->dns_io_per_server)) {
msg_warn ("cannot parse ip address of nameserver: %s", begin);
cur = g_list_next (cur);
continue;
}
cur = g_list_next (cur);
}
}
rdns_resolver_init (new->r);
return new;
}
|
