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399c6333 | 1 | /* authd/dns.c - authd DNS functions |
8cf45447 AC |
2 | * Copyright (c) 2016 William Pitcock <nenolod@dereferenced.org> |
3 | * | |
4 | * Permission to use, copy, modify, and/or distribute this software for any | |
5 | * purpose with or without fee is hereby granted, provided that the above | |
6 | * copyright notice and this permission notice is present in all copies. | |
7 | * | |
8 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
9 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED | |
10 | * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE | |
11 | * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, | |
12 | * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES | |
13 | * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR | |
14 | * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
15 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, | |
16 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING | |
17 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
18 | * POSSIBILITY OF SUCH DAMAGE. | |
19 | */ | |
20 | ||
21 | #include "authd.h" | |
22 | #include "dns.h" | |
02e141f7 | 23 | #include "notice.h" |
394b8dde | 24 | #include "res.h" |
8cf45447 | 25 | |
399c6333 EM |
26 | static void handle_lookup_ip_reply(void *data, struct DNSReply *reply); |
27 | static void handle_lookup_hostname_reply(void *data, struct DNSReply *reply); | |
28 | ||
29 | uint64_t query_count = 0; | |
30 | ||
31 | /* A bit different from ircd... you just get a dns_query object. | |
32 | * | |
33 | * It gets freed whenever the res code gets back to us. | |
34 | */ | |
35 | struct dns_query * | |
36 | lookup_ip(const char *host, int aftype, DNSCB callback, void *data) | |
8cf45447 | 37 | { |
399c6333 EM |
38 | struct dns_query *query = rb_malloc(sizeof(struct dns_query)); |
39 | int g_type; | |
8cf45447 | 40 | |
399c6333 | 41 | if(aftype == AF_INET) |
8cf45447 | 42 | { |
399c6333 EM |
43 | query->type = QUERY_A; |
44 | g_type = T_A; | |
8cf45447 | 45 | } |
399c6333 EM |
46 | else if(aftype == AF_INET6) |
47 | { | |
48 | query->type = QUERY_AAAA; | |
49 | g_type = T_AAAA; | |
50 | } | |
399c6333 EM |
51 | else |
52 | { | |
53 | rb_free(query); | |
54 | return NULL; | |
55 | } | |
56 | ||
57 | query->id = query_count++; | |
58 | query->callback = callback; | |
59 | query->data = data; | |
8cf45447 | 60 | |
399c6333 EM |
61 | query->query.ptr = query; |
62 | query->query.callback = handle_lookup_ip_reply; | |
63 | ||
64 | gethost_byname_type(host, &query->query, g_type); | |
65 | ||
66 | return query; | |
67 | } | |
68 | ||
69 | /* See lookup_ip's comment */ | |
70 | struct dns_query * | |
2b0cc3d3 | 71 | lookup_hostname(const char *ip, DNSCB callback, void *data) |
399c6333 EM |
72 | { |
73 | struct dns_query *query = rb_malloc(sizeof(struct dns_query)); | |
2b0cc3d3 | 74 | int aftype; |
399c6333 EM |
75 | |
76 | if(!rb_inet_pton_sock(ip, (struct sockaddr *)&query->addr)) | |
8cf45447 | 77 | { |
399c6333 EM |
78 | rb_free(query); |
79 | return NULL; | |
80 | } | |
81 | ||
2b0cc3d3 EM |
82 | aftype = GET_SS_FAMILY(&query->addr); |
83 | ||
399c6333 EM |
84 | if(aftype == AF_INET) |
85 | query->type = QUERY_PTR_A; | |
399c6333 EM |
86 | else if(aftype == AF_INET6) |
87 | query->type = QUERY_PTR_AAAA; | |
399c6333 EM |
88 | else |
89 | { | |
90 | rb_free(query); | |
91 | return NULL; | |
92 | } | |
8cf45447 | 93 | |
399c6333 EM |
94 | query->id = query_count++; |
95 | query->callback = callback; | |
96 | query->data = data; | |
8cf45447 | 97 | |
399c6333 EM |
98 | query->query.ptr = query; |
99 | query->query.callback = handle_lookup_hostname_reply; | |
8cf45447 | 100 | |
399c6333 EM |
101 | gethost_byaddr(&query->addr, &query->query); |
102 | ||
103 | return query; | |
104 | } | |
105 | ||
45ac1e3c | 106 | /* Cancel a pending query */ |
540676fc | 107 | void |
45ac1e3c EM |
108 | cancel_query(struct dns_query *query) |
109 | { | |
110 | query->callback = query->data = NULL; | |
111 | } | |
112 | ||
399c6333 EM |
113 | /* Callback from gethost_byname_type */ |
114 | static void | |
115 | handle_lookup_ip_reply(void *data, struct DNSReply *reply) | |
116 | { | |
117 | struct dns_query *query = data; | |
10960258 | 118 | char ip[HOSTIPLEN] = "*"; |
399c6333 | 119 | |
238a9ed5 | 120 | if(query == NULL) |
34b96d7f | 121 | { |
399c6333 | 122 | /* Shouldn't happen */ |
34b96d7f EM |
123 | warn_opers(L_CRIT, "DNS: handle_lookup_ip_reply: query == NULL!"); |
124 | exit(EX_DNS_ERROR); | |
125 | } | |
2b0cc3d3 | 126 | |
2b0cc3d3 | 127 | if(reply == NULL) |
399c6333 EM |
128 | goto end; |
129 | ||
130 | switch(query->type) | |
131 | { | |
132 | case QUERY_A: | |
133 | if(GET_SS_FAMILY(&reply->addr) == AF_INET) | |
134 | rb_inet_ntop_sock((struct sockaddr *)&reply->addr, ip, sizeof(ip)); | |
8cf45447 | 135 | break; |
399c6333 EM |
136 | case QUERY_AAAA: |
137 | if(GET_SS_FAMILY(&reply->addr) == AF_INET6) | |
8cf45447 | 138 | { |
399c6333 EM |
139 | rb_inet_ntop_sock((struct sockaddr *)&reply->addr, ip, sizeof(ip)); |
140 | if(ip[0] == ':') | |
8cf45447 | 141 | { |
399c6333 EM |
142 | memmove(&ip[1], ip, strlen(ip)); |
143 | ip[0] = '0'; | |
8cf45447 AC |
144 | } |
145 | } | |
146 | break; | |
8cf45447 | 147 | default: |
34b96d7f EM |
148 | warn_opers(L_CRIT, "DNS: handle_lookup_ip_reply: unknown query type %d", |
149 | query->type); | |
150 | exit(EX_DNS_ERROR); | |
8cf45447 AC |
151 | } |
152 | ||
399c6333 EM |
153 | end: |
154 | if(query->callback) | |
238a9ed5 | 155 | query->callback(ip, ip[0] != '*', query->type, query->data); |
399c6333 EM |
156 | |
157 | rb_free(query); | |
158 | } | |
159 | ||
160 | /* Callback from gethost_byaddr */ | |
161 | static void | |
162 | handle_lookup_hostname_reply(void *data, struct DNSReply *reply) | |
163 | { | |
164 | struct dns_query *query = data; | |
165 | char *hostname = NULL; | |
399c6333 | 166 | |
2b0cc3d3 | 167 | if(query == NULL) |
34b96d7f | 168 | { |
399c6333 | 169 | /* Shouldn't happen */ |
34b96d7f EM |
170 | warn_opers(L_CRIT, "DNS: handle_lookup_hostname_reply: query == NULL!"); |
171 | exit(EX_DNS_ERROR); | |
172 | } | |
399c6333 | 173 | |
2b0cc3d3 | 174 | if(reply == NULL) |
399c6333 EM |
175 | goto end; |
176 | ||
177 | if(query->type == QUERY_PTR_A) | |
178 | { | |
179 | struct sockaddr_in *ip, *ip_fwd; | |
180 | ip = (struct sockaddr_in *) &query->addr; | |
181 | ip_fwd = (struct sockaddr_in *) &reply->addr; | |
182 | ||
2b0cc3d3 | 183 | if(ip->sin_addr.s_addr == ip_fwd->sin_addr.s_addr) |
399c6333 EM |
184 | hostname = reply->h_name; |
185 | } | |
399c6333 EM |
186 | else if(query->type == QUERY_PTR_AAAA) |
187 | { | |
188 | struct sockaddr_in6 *ip, *ip_fwd; | |
189 | ip = (struct sockaddr_in6 *) &query->addr; | |
190 | ip_fwd = (struct sockaddr_in6 *) &reply->addr; | |
191 | ||
2b0cc3d3 | 192 | if(memcmp(&ip->sin6_addr, &ip_fwd->sin6_addr, sizeof(struct in6_addr)) == 0) |
399c6333 EM |
193 | hostname = reply->h_name; |
194 | } | |
399c6333 | 195 | else |
34b96d7f | 196 | { |
399c6333 | 197 | /* Shouldn't happen */ |
34b96d7f EM |
198 | warn_opers(L_CRIT, "DNS: handle_lookup_hostname_reply: unknown query type %d", |
199 | query->type); | |
200 | exit(EX_DNS_ERROR); | |
201 | } | |
399c6333 EM |
202 | end: |
203 | if(query->callback) | |
204 | query->callback(hostname, hostname != NULL, query->type, query->data); | |
205 | ||
206 | rb_free(query); | |
207 | } | |
208 | ||
209 | static void | |
210 | submit_dns_answer(const char *reply, bool status, query_type type, void *data) | |
211 | { | |
212 | char *id = data; | |
213 | ||
214 | if(!id || type == QUERY_INVALID) | |
34b96d7f EM |
215 | { |
216 | warn_opers(L_CRIT, "DNS: submit_dns_answer gave us a bad query"); | |
217 | exit(EX_DNS_ERROR); | |
218 | } | |
399c6333 | 219 | |
2b0cc3d3 | 220 | if(reply == NULL || status == false) |
399c6333 EM |
221 | { |
222 | rb_helper_write(authd_helper, "E %s E %c *", id, type); | |
223 | rb_free(id); | |
1d9925cf | 224 | return; |
399c6333 EM |
225 | } |
226 | ||
227 | rb_helper_write(authd_helper, "E %s O %c %s", id, type, reply); | |
228 | rb_free(id); | |
8cf45447 AC |
229 | } |
230 | ||
231 | void | |
60374ac9 | 232 | handle_resolve_dns(int parc, char *parv[]) |
8cf45447 | 233 | { |
399c6333 EM |
234 | char *id = rb_strdup(parv[1]); |
235 | char qtype = *parv[2]; | |
236 | char *record = parv[3]; | |
237 | int aftype = AF_INET; | |
8cf45447 | 238 | |
399c6333 | 239 | switch(qtype) |
8cf45447 | 240 | { |
8cf45447 | 241 | case '6': |
399c6333 | 242 | aftype = AF_INET6; |
399c6333 EM |
243 | case '4': |
244 | if(!lookup_ip(record, aftype, submit_dns_answer, id)) | |
245 | submit_dns_answer(NULL, false, qtype, NULL); | |
8cf45447 | 246 | break; |
8cf45447 | 247 | case 'S': |
399c6333 | 248 | case 'R': |
2b0cc3d3 | 249 | if(!lookup_hostname(record, submit_dns_answer, id)) |
399c6333 | 250 | submit_dns_answer(NULL, false, qtype, NULL); |
8cf45447 | 251 | break; |
399c6333 | 252 | default: |
34b96d7f EM |
253 | warn_opers(L_CRIT, "DNS: handle_resolve_dns got an unknown query: %c", qtype); |
254 | exit(EX_DNS_ERROR); | |
8cf45447 | 255 | } |
8cf45447 | 256 | } |
394b8dde EM |
257 | |
258 | void | |
26d491b9 | 259 | enumerate_nameservers(uint32_t rid, const char letter) |
394b8dde | 260 | { |
2b0cc3d3 | 261 | char buf[(HOSTIPLEN + 1) * IRCD_MAXNS]; |
02e141f7 | 262 | size_t s = 0; |
394b8dde EM |
263 | |
264 | if (!irc_nscount) | |
265 | { | |
266 | /* Shouldn't happen */ | |
34b96d7f | 267 | warn_opers(L_CRIT, "DNS: no name servers!"); |
26d491b9 | 268 | stats_error(rid, letter, "NONAMESERVERS"); |
34b96d7f | 269 | exit(EX_DNS_ERROR); |
394b8dde EM |
270 | } |
271 | ||
02e141f7 | 272 | for(int i = 0; i < irc_nscount; i++) |
394b8dde | 273 | { |
2b0cc3d3 | 274 | char addr[HOSTIPLEN]; |
02e141f7 | 275 | size_t addrlen; |
394b8dde EM |
276 | |
277 | rb_inet_ntop_sock((struct sockaddr *)&irc_nsaddr_list[i], addr, sizeof(addr)); | |
278 | ||
279 | if (!addr[0]) | |
280 | { | |
281 | /* Shouldn't happen */ | |
34b96d7f | 282 | warn_opers(L_CRIT, "DNS: bad nameserver!"); |
26d491b9 | 283 | stats_error(rid, letter, "INVALIDNAMESERVER"); |
34b96d7f | 284 | exit(EX_DNS_ERROR); |
394b8dde EM |
285 | } |
286 | ||
02e141f7 | 287 | addrlen = strlen(addr) + 1; |
26d491b9 | 288 | (void)snprintf(&buf[s], sizeof(buf) - s, "%s ", addr); |
02e141f7 | 289 | s += addrlen; |
394b8dde EM |
290 | } |
291 | ||
26d491b9 EM |
292 | if(s > 0) |
293 | buf[--s] = '\0'; | |
394b8dde | 294 | |
26d491b9 | 295 | stats_result(rid, letter, "%s", buf); |
394b8dde | 296 | } |
6445c1cf EM |
297 | |
298 | void | |
299 | reload_nameservers(const char letter) | |
300 | { | |
301 | /* Not a whole lot to it */ | |
302 | restart_resolver(); | |
303 | } |