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      1 /*	$NetBSD: geoip.c,v 1.8 2025/01/26 16:24:33 christos Exp $	*/
      2 
      3 /*
      4  * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
      5  *
      6  * SPDX-License-Identifier: MPL-2.0
      7  *
      8  * This Source Code Form is subject to the terms of the Mozilla Public
      9  * License, v. 2.0. If a copy of the MPL was not distributed with this
     10  * file, you can obtain one at https://mozilla.org/MPL/2.0/.
     11  *
     12  * See the COPYRIGHT file distributed with this work for additional
     13  * information regarding copyright ownership.
     14  */
     15 
     16 /*! \file */
     17 
     18 #if defined(HAVE_GEOIP2)
     19 #include <maxminddb.h>
     20 #endif /* if defined(HAVE_GEOIP2) */
     21 
     22 #include <isc/dir.h>
     23 #include <isc/string.h>
     24 #include <isc/util.h>
     25 
     26 #include <dns/geoip.h>
     27 
     28 #include <named/geoip.h>
     29 #include <named/log.h>
     30 
     31 static dns_geoip_databases_t geoip_table;
     32 
     33 #if defined(HAVE_GEOIP2)
     34 static MMDB_s geoip_country, geoip_city, geoip_as, geoip_isp, geoip_domain;
     35 
     36 static MMDB_s *
     37 open_geoip2(const char *dir, const char *dbfile, MMDB_s *mmdb) {
     38 	char pathbuf[PATH_MAX];
     39 	unsigned int n;
     40 	int ret;
     41 
     42 	n = snprintf(pathbuf, sizeof(pathbuf), "%s/%s", dir, dbfile);
     43 	if (n >= sizeof(pathbuf)) {
     44 		isc_log_write(named_g_lctx, NAMED_LOGCATEGORY_GENERAL,
     45 			      NAMED_LOGMODULE_SERVER, ISC_LOG_ERROR,
     46 			      "GeoIP2 database '%s/%s': path too long", dir,
     47 			      dbfile);
     48 		return NULL;
     49 	}
     50 
     51 	ret = MMDB_open(pathbuf, MMDB_MODE_MMAP, mmdb);
     52 	if (ret == MMDB_SUCCESS) {
     53 		isc_log_write(named_g_lctx, NAMED_LOGCATEGORY_GENERAL,
     54 			      NAMED_LOGMODULE_SERVER, ISC_LOG_INFO,
     55 			      "opened GeoIP2 database '%s'", pathbuf);
     56 		return mmdb;
     57 	}
     58 
     59 	isc_log_write(named_g_lctx, NAMED_LOGCATEGORY_GENERAL,
     60 		      NAMED_LOGMODULE_SERVER, ISC_LOG_DEBUG(1),
     61 		      "unable to open GeoIP2 database '%s' (status %d)",
     62 		      pathbuf, ret);
     63 
     64 	return NULL;
     65 }
     66 #endif /* HAVE_GEOIP2 */
     67 
     68 void
     69 named_geoip_init(void) {
     70 #if defined(HAVE_GEOIP2)
     71 	if (named_g_geoip == NULL) {
     72 		named_g_geoip = &geoip_table;
     73 	}
     74 #else  /* if defined(HAVE_GEOIP2) */
     75 	return;
     76 #endif /* if defined(HAVE_GEOIP2) */
     77 }
     78 
     79 void
     80 named_geoip_load(char *dir) {
     81 #if defined(HAVE_GEOIP2)
     82 	REQUIRE(dir != NULL);
     83 
     84 	isc_log_write(named_g_lctx, NAMED_LOGCATEGORY_GENERAL,
     85 		      NAMED_LOGMODULE_SERVER, ISC_LOG_INFO,
     86 		      "looking for GeoIP2 databases in '%s'", dir);
     87 
     88 	named_g_geoip->country = open_geoip2(dir, "GeoIP2-Country.mmdb",
     89 					     &geoip_country);
     90 	if (named_g_geoip->country == NULL) {
     91 		named_g_geoip->country = open_geoip2(
     92 			dir, "GeoLite2-Country.mmdb", &geoip_country);
     93 	}
     94 
     95 	named_g_geoip->city = open_geoip2(dir, "GeoIP2-City.mmdb", &geoip_city);
     96 	if (named_g_geoip->city == NULL) {
     97 		named_g_geoip->city = open_geoip2(dir, "GeoLite2-City.mmdb",
     98 						  &geoip_city);
     99 	}
    100 
    101 	named_g_geoip->as = open_geoip2(dir, "GeoIP2-ASN.mmdb", &geoip_as);
    102 	if (named_g_geoip->as == NULL) {
    103 		named_g_geoip->as = open_geoip2(dir, "GeoLite2-ASN.mmdb",
    104 						&geoip_as);
    105 	}
    106 
    107 	named_g_geoip->isp = open_geoip2(dir, "GeoIP2-ISP.mmdb", &geoip_isp);
    108 	named_g_geoip->domain = open_geoip2(dir, "GeoIP2-Domain.mmdb",
    109 					    &geoip_domain);
    110 #else  /* if defined(HAVE_GEOIP2) */
    111 	UNUSED(dir);
    112 
    113 	return;
    114 #endif /* if defined(HAVE_GEOIP2) */
    115 }
    116 
    117 void
    118 named_geoip_unload(void) {
    119 #ifdef HAVE_GEOIP2
    120 	if (named_g_geoip->country != NULL) {
    121 		MMDB_close(named_g_geoip->country);
    122 		named_g_geoip->country = NULL;
    123 	}
    124 	if (named_g_geoip->city != NULL) {
    125 		MMDB_close(named_g_geoip->city);
    126 		named_g_geoip->city = NULL;
    127 	}
    128 	if (named_g_geoip->as != NULL) {
    129 		MMDB_close(named_g_geoip->as);
    130 		named_g_geoip->as = NULL;
    131 	}
    132 	if (named_g_geoip->isp != NULL) {
    133 		MMDB_close(named_g_geoip->isp);
    134 		named_g_geoip->isp = NULL;
    135 	}
    136 	if (named_g_geoip->domain != NULL) {
    137 		MMDB_close(named_g_geoip->domain);
    138 		named_g_geoip->domain = NULL;
    139 	}
    140 #endif /* ifdef HAVE_GEOIP2 */
    141 }
    142 
    143 void
    144 named_geoip_shutdown(void) {
    145 #ifdef HAVE_GEOIP2
    146 	named_geoip_unload();
    147 #endif /* HAVE_GEOIP2 */
    148 }
    149