/[svn]/hopm/trunk/src/dnsbl.c
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Contents of /hopm/trunk/src/dnsbl.c

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Revision 5315 - (show annotations)
Tue Jan 6 13:33:51 2015 UTC (4 years, 11 months ago) by michael
File MIME type: text/x-chdr
File size: 7838 byte(s)
- dnsbl.c:dnsbl_add(): use MyFree() instead of free(); removed pointless cast

1 /*
2 Copyright (C) 2002-2003 Erik Fears
3
4 This program is free software; you can redistribute it and/or
5 modify it under the terms of the GNU General Public License
6 as published by the Free Software Foundation; either version 2
7 of the License, or (at your option) any later version.
8
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
13
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16
17 Foundation, Inc.
18 59 Temple Place - Suite 330
19 Boston, MA 02111-1307, USA.
20
21 */
22
23 #include "setup.h"
24
25 #include <stdio.h>
26 #include <stdlib.h>
27 #include <string.h>
28 #include <sys/types.h>
29 #include <sys/socket.h>
30 #include <netinet/in.h>
31 #include <arpa/inet.h>
32 #include <time.h>
33 #include <errno.h>
34
35 #include "compat.h"
36 #include "config.h"
37 #include "dnsbl.h"
38 #include "list.h"
39 #include "log.h"
40 #include "main.h"
41 #include "malloc.h"
42 #include "match.h"
43 #include "scan.h"
44 #include "irc.h"
45 #include "stats.h"
46
47
48 /*
49 * Work out the DNSBL zones and send the dns query
50 */
51 void
52 dnsbl_add(struct scan_struct *ss)
53 {
54 struct in_addr in;
55 unsigned char a, b, c, d;
56 char lookup[128];
57 node_t *p;
58 int res;
59 struct dnsbl_scan *ds;
60
61 if (inet_pton(AF_INET, ss->ip, &in) <= 0)
62 {
63 log_printf("DNSBL -> Invalid address '%s', ignoring.", ss->ip);
64 return;
65 }
66
67 d = (unsigned char)(in.s_addr >> 24) & 0xFF;
68 c = (unsigned char)(in.s_addr >> 16) & 0xFF;
69 b = (unsigned char)(in.s_addr >> 8) & 0xFF;
70 a = (unsigned char) in.s_addr & 0xFF;
71
72 LIST_FOREACH(p, OpmItem->blacklists->head)
73 {
74 struct BlacklistConf *bl = p->data;
75
76 #ifdef WORDS_BIGENDIAN
77 snprintf(lookup, sizeof(lookup), "%d.%d.%d.%d.%s", a, b, c, d, bl->name);
78 #else
79 snprintf(lookup, sizeof(lookup), "%d.%d.%d.%d.%s", d, c, b, a, bl->name);
80 #endif
81
82 ds = xcalloc(sizeof *ds);
83 ds->ss = ss;
84 ds->bl = bl;
85
86 if (OPT_DEBUG)
87 log_printf("DNSBL -> Passed '%s' to resolver", lookup);
88
89 res = firedns_getip(FDNS_QRY_A, lookup, ds);
90
91 if (res == -1 && fdns_errno != FDNS_ERR_FDLIMIT)
92 {
93 log_printf("DNSBL -> Error sending dns lookup for '%s': %s", lookup, firedns_strerror(fdns_errno));
94 MyFree(ds);
95 }
96 else
97 ++ss->scans; /* Increase scan count - one for each blacklist */
98 }
99 }
100
101 static void
102 dnsbl_positive(struct scan_struct *ss, struct BlacklistConf *bl, unsigned char type)
103 {
104 char text_type[128] = "";
105 node_t *p;
106
107 if (bl->type == A_BITMASK)
108 {
109 LIST_FOREACH(p, bl->reply->head)
110 {
111 const struct BlacklistReplyConf *item = p->data;
112
113 if (item->number & type)
114 {
115 strncat(text_type, item->type, sizeof(text_type) - strlen(text_type) - 2);
116 text_type[sizeof(text_type) - 2] = '\0';
117
118 strncat(text_type, ", ", sizeof(text_type) - strlen(text_type) - 1);
119 text_type[sizeof(text_type) - 1] = '\0';
120 }
121 }
122
123 if (text_type[0])
124 *(strrchr(text_type, ',')) = '\0';
125 }
126 else
127 {
128 LIST_FOREACH(p, bl->reply->head)
129 {
130 const struct BlacklistReplyConf *item = p->data;
131
132 if (item->number == type)
133 {
134 strlcpy(text_type, item->type, sizeof(text_type));
135 break;
136 }
137 }
138 }
139
140 if (text_type[0] == '\0' && bl->ban_unknown == 0)
141 {
142 if (OPT_DEBUG)
143 log_printf("DNSBL -> Unknown result from BL zone %s (%d)", bl->name, type);
144
145 return;
146 }
147
148 if (ss->manual_target)
149 irc_send("PRIVMSG %s :CHECK -> DNSBL -> %s appears in BL zone %s (%s)",
150 ss->manual_target->name, ss->ip, bl->name, text_type);
151 else if (!ss->positive)
152 {
153 /* Only report it if no other scans have found positives yet. */
154 scan_positive(ss, (bl->kline[0] ? bl->kline : IRCItem->kline), text_type);
155
156 irc_send_channels("DNSBL -> %s!%s@%s appears in BL zone %s (%s)",
157 ss->irc_nick, ss->irc_username, ss->irc_hostname, bl->name,
158 text_type);
159 log_printf("DNSBL -> %s!%s@%s appears in BL zone %s (%s)",
160 ss->irc_nick, ss->irc_username, ss->irc_hostname, bl->name,
161 text_type);
162 }
163
164 /* Record stat */
165 stats_dnsblrecv(bl);
166 }
167
168 void
169 dnsbl_result(struct firedns_result *res)
170 {
171 struct dnsbl_scan *ds = res->info;
172
173 if (OPT_DEBUG)
174 {
175 if (ds->ss->manual_target)
176 log_printf("DNSBL -> Lookup result for %s (%s) %d.%d.%d.%d (error: %d)",
177 ds->ss->ip,
178 res->lookup,
179 (unsigned char)res->text[0],
180 (unsigned char)res->text[1],
181 (unsigned char)res->text[2],
182 (unsigned char)res->text[3], fdns_errno);
183 else
184 log_printf("DNSBL -> Lookup result for %s!%s@%s (%s) %d.%d.%d.%d (error: %d)",
185 ds->ss->irc_nick,
186 ds->ss->irc_username,
187 ds->ss->irc_hostname,
188 res->lookup,
189 (unsigned char)res->text[0],
190 (unsigned char)res->text[1],
191 (unsigned char)res->text[2],
192 (unsigned char)res->text[3], fdns_errno);
193 }
194
195 /* Everything is OK */
196 if (res->text[0] == '\0' && fdns_errno == FDNS_ERR_NXDOMAIN)
197 {
198 if (ds->ss->manual_target)
199 irc_send("PRIVMSG %s :CHECK -> DNSBL -> %s does not appear in BL zone %s",
200 ds->ss->manual_target->name, ds->ss->ip,
201 (strlen(ds->ss->ip) < strlen(res->lookup)) ? (res->lookup + strlen(ds->ss->ip) + 1) : res->lookup);
202
203 --ds->ss->scans; /* We are done with ss here */
204 scan_checkfinished(ds->ss); /* This could free ss, don't use ss after this point */
205 MyFree(ds); /* No longer need our information */
206 return;
207 }
208
209 /* Either an error, or a positive lookup */
210 if (fdns_errno == FDNS_ERR_NONE)
211 dnsbl_positive(ds->ss, ds->bl, (unsigned char)res->text[3]);
212 else
213 {
214 log_printf("DNSBL -> Lookup error on %s: %s", res->lookup,
215 firedns_strerror(fdns_errno));
216
217 if (fdns_errno != FDNS_ERR_TIMEOUT)
218 irc_send_channels("DNSBL -> Lookup error on %s: %s", res->lookup,
219 firedns_strerror(fdns_errno));
220 }
221
222 /* Check if ss has any remaining scans */
223 --ds->ss->scans; /* We are done with ss here */
224 scan_checkfinished(ds->ss); /* This could free ss, don't use ss after this point */
225 MyFree(ds); /* Finished with dnsbl_scan too */
226 }
227
228 void
229 dnsbl_cycle(void)
230 {
231 firedns_cycle();
232 }
233
234 #define DNSBL_REPORT_VERSION "3.1.3"
235
236 /*
237 * Send an email to report this open proxy.
238 */
239 void
240 dnsbl_report(struct scan_struct *ss)
241 {
242 char buf[4096], cmdbuf[512];
243 FILE *fp;
244
245 if (ss->ip == NULL)
246 return;
247
248 if (EmptyString(OpmItem->dnsbl_to) || EmptyString(OpmItem->dnsbl_from) || EmptyString(OpmItem->sendmail))
249 return;
250
251 snprintf(cmdbuf, sizeof(cmdbuf), "%s -t", OpmItem->sendmail);
252 snprintf(buf, sizeof(buf),
253 "From: %s <%s>\n"
254 "To: %s\n"
255 "Subject: BOPM Report\n"
256 "X-BOPM-Version: %s\n\n"
257 "%s: %s:%d\n\n"
258 "%s\n", IRCItem->nick, OpmItem->dnsbl_from, OpmItem->dnsbl_to,
259 DNSBL_REPORT_VERSION, scan_gettype(ss->remote->protocol), ss->ip,
260 ss->remote->port, ss->proof);
261
262 if (OPT_DEBUG >= 3)
263 log_printf("DNSBL -> Sending following email:\n%s\n", buf);
264
265 if ((fp = popen(cmdbuf, "w")) == NULL)
266 {
267 log_printf("DNSBL -> Failed to create pipe to '%s' for email report!", cmdbuf);
268 irc_send_channels("I was trying to create a pipe to'%s' to send a DNSBL "
269 "report, and it failed! I'll give up for now.",
270 cmdbuf);
271 return;
272 }
273
274 fputs(buf, fp);
275 pclose(fp);
276
277 log_printf("DNSBL -> Sent report to %s [%s]", OpmItem->dnsbl_to, ss->ip);
278
279 /* Record send in stats */
280 stats_dnsblsend();
281 }

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