trunk/src/dnsbl.c

/*
Copyright (C) 2002-2003  Erik Fears
 
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.
 
*/

#include "setup.h"

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <time.h>
#include <errno.h>

#include "compat.h"
#include "config.h"
#include "dnsbl.h"
#include "list.h"
#include "log.h"
#include "main.h"
#include "malloc.h"
#include "match.h"
#include "scan.h"
#include "irc.h"
#include "stats.h"


/*
 * Work out the DNSBL zones and send the dns query
 */
void
dnsbl_add(struct scan_struct *ss)
{
  struct in_addr in;
  unsigned char a, b, c, d;
  char lookup[128];
  node_t *p;
  int res;
  struct dnsbl_scan *ds;

  if (inet_pton(AF_INET, ss->ip, &in) <= 0)
  {
    log_printf("DNSBL -> Invalid address '%s', ignoring.", ss->ip);
    return;
  }

  d = (unsigned char)(in.s_addr >> 24) & 0xFF;
  c = (unsigned char)(in.s_addr >> 16) & 0xFF;
  b = (unsigned char)(in.s_addr >>  8) & 0xFF;
  a = (unsigned char) in.s_addr & 0xFF;

  LIST_FOREACH(p, OpmItem->blacklists->head)
  {
    struct BlacklistConf *bl = p->data;

#ifdef WORDS_BIGENDIAN
    snprintf(lookup, 128, "%d.%d.%d.%d.%s", a, b, c, d, bl->name);
#else
    snprintf(lookup, 128, "%d.%d.%d.%d.%s", d, c, b, a, bl->name);
#endif

    ds = xcalloc(sizeof *ds);
    ds->ss = ss;
    ds->bl = bl;

    if (OPT_DEBUG)
      log_printf("DNSBL -> Passed '%s' to resolver", lookup);

    res = firedns_getip(FDNS_QRY_A, lookup, (void *) ds);

    if (res == -1 && fdns_errno != FDNS_ERR_FDLIMIT)
    {
      log_printf("DNSBL -> Error sending dns lookup for '%s': %s", lookup, firedns_strerror(fdns_errno));
      free(ds);
    }
    else
      ++ss->scans;  /* Increase scan count - one for each blacklist */
  }
}

static void
dnsbl_positive(struct scan_struct *ss, struct BlacklistConf *bl, unsigned char type)
{
  char text_type[128] = "";
  node_t *p;

  if (bl->type == A_BITMASK)
  {
    LIST_FOREACH(p, bl->reply->head)
    {
      const struct BlacklistReplyConf *item = p->data;

      if (item->number & type)
      {
        strncat(text_type, item->type, sizeof(text_type) - strlen(text_type) - 2);
        text_type[sizeof(text_type) - 2] = '\0';

        strncat(text_type, ", ", sizeof(text_type) - strlen(text_type) - 1);
        text_type[sizeof(text_type) - 1] = '\0';
      }
    }

    if (text_type[0])
      *(strrchr(text_type, ',')) = '\0';
  }
  else
  {
    LIST_FOREACH(p, bl->reply->head)
    {
      const struct BlacklistReplyConf *item = p->data;

      if (item->number == type)
      {
        strlcpy(text_type, item->type, sizeof(text_type));
        break;
      }
    }
  }

  if (text_type[0] == '\0' && bl->ban_unknown == 0)
  {
    if (OPT_DEBUG)
      log_printf("DNSBL -> Unknown result from BL zone %s (%d)", bl->name, type);

    return;
  }

  if (ss->manual_target)
    irc_send("PRIVMSG %s :CHECK -> DNSBL -> %s appears in BL zone %s (%s)",
             ss->manual_target->name, ss->ip, bl->name, text_type);
  else if (!ss->positive)
  {
    /* Only report it if no other scans have found positives yet. */
    scan_positive(ss, (bl->kline[0] ? bl->kline : IRCItem->kline), text_type);

    irc_send_channels("DNSBL -> %s!%s@%s appears in BL zone %s (%s)",
                      ss->irc_nick, ss->irc_username, ss->irc_hostname, bl->name,
                      text_type);
    log_printf("DNSBL -> %s!%s@%s appears in BL zone %s (%s)",
               ss->irc_nick, ss->irc_username, ss->irc_hostname, bl->name,
               text_type);
  }

  /* Record stat */
  stats_dnsblrecv(bl);
}

void
dnsbl_result(struct firedns_result *res)
{
  struct dnsbl_scan *ds = res->info;

  if (OPT_DEBUG)
  {
    if (ds->ss->manual_target)
      log_printf("DNSBL -> Lookup result for %s (%s) %d.%d.%d.%d (error: %d)",
                 ds->ss->ip,
                 res->lookup,
                 (unsigned char)res->text[0],
                 (unsigned char)res->text[1],
                 (unsigned char)res->text[2],
                 (unsigned char)res->text[3], fdns_errno);
    else
      log_printf("DNSBL -> Lookup result for %s!%s@%s (%s) %d.%d.%d.%d (error: %d)",
                 ds->ss->irc_nick,
                 ds->ss->irc_username,
                 ds->ss->irc_hostname,
                 res->lookup,
                 (unsigned char)res->text[0],
                 (unsigned char)res->text[1],
                 (unsigned char)res->text[2],
                 (unsigned char)res->text[3], fdns_errno);
  }

  /* Everything is OK */
  if (res->text[0] == '\0' && fdns_errno == FDNS_ERR_NXDOMAIN)
  {
    if (ds->ss->manual_target)
      irc_send("PRIVMSG %s :CHECK -> DNSBL -> %s does not appear in BL zone %s",
               ds->ss->manual_target->name, ds->ss->ip,
               (strlen(ds->ss->ip) < strlen(res->lookup)) ? (res->lookup + strlen(ds->ss->ip) + 1) : res->lookup);

    --ds->ss->scans;  /* We are done with ss here */
    scan_checkfinished(ds->ss);  /* This could free ss, don't use ss after this point */
    MyFree(ds);  /* No longer need our information */
    return;
  }

  /* Either an error, or a positive lookup */
  if (fdns_errno == FDNS_ERR_NONE)
    dnsbl_positive(ds->ss, ds->bl, (unsigned char)res->text[3]);
  else
  {
    log_printf("DNSBL -> Lookup error on %s: %s", res->lookup,
               firedns_strerror(fdns_errno));

    if (fdns_errno != FDNS_ERR_TIMEOUT)
      irc_send_channels("DNSBL -> Lookup error on %s: %s", res->lookup,
                        firedns_strerror(fdns_errno));
  }

  /* Check if ss has any remaining scans */
  --ds->ss->scans;  /* We are done with ss here */
  scan_checkfinished(ds->ss);  /* This could free ss, don't use ss after this point */
  MyFree(ds);  /* Finished with dnsbl_scan too */
}

void
dnsbl_cycle(void)
{
  firedns_cycle();
}

#define DNSBL_REPORT_VERSION "3.1.3"

/*
 * Send an email to report this open proxy.
 */
void
dnsbl_report(struct scan_struct *ss)
{
  char buf[4096], cmdbuf[512];
  FILE *fp;

  if (ss->ip == NULL)
    return;

  if (EmptyString(OpmItem->dnsbl_to) || EmptyString(OpmItem->dnsbl_from) || EmptyString(OpmItem->sendmail))
    return;

  snprintf(cmdbuf, sizeof(cmdbuf), "%s -t", OpmItem->sendmail);
  snprintf(buf, sizeof(buf),
           "From: %s <%s>\n"
           "To: %s\n"
           "Subject: BOPM Report\n"
           "X-BOPM-Version: %s\n\n"
           "%s: %s:%d\n\n"
           "%s\n", IRCItem->nick, OpmItem->dnsbl_from, OpmItem->dnsbl_to,
           DNSBL_REPORT_VERSION, scan_gettype(ss->remote->protocol), ss->ip,
           ss->remote->port, ss->proof);

  if (OPT_DEBUG >= 3)
    log_printf("DNSBL -> Sending following email:\n%s\n", buf);

  if ((fp = popen(cmdbuf, "w")) == NULL)
  {
    log_printf("DNSBL -> Failed to create pipe to '%s' for email report!", cmdbuf);
    irc_send_channels("I was trying to create a pipe to'%s' to send a DNSBL "
                      "report, and it failed! I'll give up for now.",
                      cmdbuf);
    return;
  }

  fputs(buf, fp);
  pclose(fp);

  log_printf("DNSBL -> Sent report to %s [%s]", OpmItem->dnsbl_to, ss->ip);

  /* Record send in stats */
  stats_dnsblsend();
}
Revision:	5279
Committed:	Fri Jan 2 20:30:49 2015 UTC (11 years, 6 months ago) by michael
Content type:	text/x-csrc
File size:	7823 byte(s)
Log Message:	- Use 'const' and 'unsigned' whenever possible - Removed pointless 0 assignments
#	User	Rev	Content
1	michael	5052	/*
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	michael	5202	#include "main.h"
41	michael	5052	#include "malloc.h"
42	michael	5077	#include "match.h"
43	michael	5052	#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	michael	5114	void
52			dnsbl_add(struct scan_struct *ss)
53	michael	5052	{
54	michael	5114	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	michael	5052
61	michael	5170	if (inet_pton(AF_INET, ss->ip, &in) <= 0)
62	michael	5114	{
63			log_printf("DNSBL -> Invalid address '%s', ignoring.", ss->ip);
64			return;
65			}
66	michael	5052
67	michael	5114	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	michael	5052
72	michael	5114	LIST_FOREACH(p, OpmItem->blacklists->head)
73			{
74			struct BlacklistConf *bl = p->data;
75
76	michael	5052	#ifdef WORDS_BIGENDIAN
77	michael	5114	snprintf(lookup, 128, "%d.%d.%d.%d.%s", a, b, c, d, bl->name);
78	michael	5052	#else
79	michael	5114	snprintf(lookup, 128, "%d.%d.%d.%d.%s", d, c, b, a, bl->name);
80	michael	5052	#endif
81
82	michael	5274	ds = xcalloc(sizeof *ds);
83	michael	5114	ds->ss = ss;
84			ds->bl = bl;
85	michael	5052
86	michael	5114	if (OPT_DEBUG)
87			log_printf("DNSBL -> Passed '%s' to resolver", lookup);
88	michael	5052
89	michael	5114	res = firedns_getip(FDNS_QRY_A, lookup, (void *) ds);
90	michael	5052
91	michael	5114	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			free(ds);
95			}
96			else
97			++ss->scans; /* Increase scan count - one for each blacklist */
98			}
99	michael	5052	}
100
101	michael	5114	static void
102			dnsbl_positive(struct scan_struct ss, struct BlacklistConf bl, unsigned char type)
103	michael	5052	{
104	michael	5114	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	michael	5279	const struct BlacklistReplyConf *item = p->data;
112	michael	5114
113			if (item->number & type)
114	michael	5052	{
115	michael	5114	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	michael	5052	}
121	michael	5114	}
122
123			if (text_type[0])
124			*(strrchr(text_type, ',')) = '\0';
125			}
126			else
127			{
128			LIST_FOREACH(p, bl->reply->head)
129			{
130	michael	5279	const struct BlacklistReplyConf *item = p->data;
131	michael	5114
132			if (item->number == type)
133	michael	5052	{
134	michael	5114	strlcpy(text_type, item->type, sizeof(text_type));
135			break;
136	michael	5052	}
137	michael	5114	}
138			}
139	michael	5052
140	michael	5114	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	michael	5052
145	michael	5114	return;
146			}
147	michael	5052
148	michael	5114	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	michael	5052	}
167
168	michael	5114	void
169			dnsbl_result(struct firedns_result *res)
170	michael	5052	{
171	michael	5114	struct dnsbl_scan *ds = res->info;
172	michael	5052
173	michael	5114	if (OPT_DEBUG)
174			{
175	michael	5090	if (ds->ss->manual_target)
176			log_printf("DNSBL -> Lookup result for %s (%s) %d.%d.%d.%d (error: %d)",
177	michael	5114	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	michael	5090	else
184	michael	5052	log_printf("DNSBL -> Lookup result for %s!%s@%s (%s) %d.%d.%d.%d (error: %d)",
185	michael	5114	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	michael	5052
195	michael	5114	/* 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	michael	5052
203	michael	5114	--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	michael	5052
209	michael	5114	/* 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	michael	5052
217	michael	5114	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	michael	5052
222	michael	5114	/* 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	michael	5052	}
227
228	michael	5114	void
229			dnsbl_cycle(void)
230	michael	5052	{
231	michael	5114	firedns_cycle();
232	michael	5052	}
233
234	michael	5256	#define DNSBL_REPORT_VERSION "3.1.3"
235
236	michael	5052	/*
237			* Send an email to report this open proxy.
238			*/
239	michael	5114	void
240			dnsbl_report(struct scan_struct *ss)
241	michael	5052	{
242	michael	5114	char buf[4096], cmdbuf[512];
243			FILE *fp;
244	michael	5052
245	michael	5114	if (ss->ip == NULL)
246			return;
247	michael	5052
248	michael	5114	if (EmptyString(OpmItem->dnsbl_to) \|\| EmptyString(OpmItem->dnsbl_from) \|\| EmptyString(OpmItem->sendmail))
249			return;
250	michael	5052
251	michael	5114	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	michael	5256	DNSBL_REPORT_VERSION, scan_gettype(ss->remote->protocol), ss->ip,
260	michael	5114	ss->remote->port, ss->proof);
261	michael	5052
262	michael	5114	if (OPT_DEBUG >= 3)
263			log_printf("DNSBL -> Sending following email:\n%s\n", buf);
264	michael	5052
265	michael	5114	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	michael	5052
274	michael	5114	fputs(buf, fp);
275			pclose(fp);
276	michael	5052
277	michael	5114	log_printf("DNSBL -> Sent report to %s [%s]", OpmItem->dnsbl_to, ss->ip);
278	michael	5052
279	michael	5114	/* Record send in stats */
280			stats_dnsblsend();
281	michael	5052	}