1 /* authd/dns.c - authd DNS functions
2 * Copyright (c) 2016 William Pitcock <nenolod@dereferenced.org>
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.
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.
26 static void handle_lookup_ip_reply(void *data
, struct DNSReply
*reply
);
27 static void handle_lookup_hostname_reply(void *data
, struct DNSReply
*reply
);
29 uint64_t query_count
= 0;
31 /* A bit different from ircd... you just get a dns_query object.
33 * It gets freed whenever the res code gets back to us.
36 lookup_ip(const char *host
, int aftype
, DNSCB callback
, void *data
)
38 struct dns_query
*query
= rb_malloc(sizeof(struct dns_query
));
43 query
->type
= QUERY_A
;
46 else if(aftype
== AF_INET6
)
48 query
->type
= QUERY_AAAA
;
57 query
->id
= query_count
++;
58 query
->callback
= callback
;
61 query
->query
.ptr
= query
;
62 query
->query
.callback
= handle_lookup_ip_reply
;
64 gethost_byname_type(host
, &query
->query
, g_type
);
69 /* See lookup_ip's comment */
71 lookup_hostname(const char *ip
, DNSCB callback
, void *data
)
73 struct dns_query
*query
= rb_malloc(sizeof(struct dns_query
));
76 if(!rb_inet_pton_sock(ip
, &query
->addr
))
82 aftype
= GET_SS_FAMILY(&query
->addr
);
85 query
->type
= QUERY_PTR_A
;
86 else if(aftype
== AF_INET6
)
87 query
->type
= QUERY_PTR_AAAA
;
94 query
->id
= query_count
++;
95 query
->callback
= callback
;
98 query
->query
.ptr
= query
;
99 query
->query
.callback
= handle_lookup_hostname_reply
;
101 gethost_byaddr(&query
->addr
, &query
->query
);
106 /* Cancel a pending query */
108 cancel_query(struct dns_query
*query
)
110 query
->callback
= query
->data
= NULL
;
113 /* Callback from gethost_byname_type */
115 handle_lookup_ip_reply(void *data
, struct DNSReply
*reply
)
117 struct dns_query
*query
= data
;
118 char ip
[HOSTIPLEN
] = "*";
122 /* Shouldn't happen */
123 warn_opers(L_CRIT
, "DNS: handle_lookup_ip_reply: query == NULL!");
133 if(GET_SS_FAMILY(&reply
->addr
) == AF_INET
)
134 rb_inet_ntop_sock((struct sockaddr
*)&reply
->addr
, ip
, sizeof(ip
));
137 if(GET_SS_FAMILY(&reply
->addr
) == AF_INET6
)
139 rb_inet_ntop_sock((struct sockaddr
*)&reply
->addr
, ip
, sizeof(ip
));
142 memmove(&ip
[1], ip
, strlen(ip
));
148 warn_opers(L_CRIT
, "DNS: handle_lookup_ip_reply: unknown query type %d",
155 query
->callback(ip
, ip
[0] != '*', query
->type
, query
->data
);
160 /* Callback from gethost_byaddr */
162 handle_lookup_hostname_reply(void *data
, struct DNSReply
*reply
)
164 struct dns_query
*query
= data
;
165 char *hostname
= NULL
;
169 /* Shouldn't happen */
170 warn_opers(L_CRIT
, "DNS: handle_lookup_hostname_reply: query == NULL!");
177 if(query
->type
== QUERY_PTR_A
)
179 struct sockaddr_in
*ip
, *ip_fwd
;
180 ip
= (struct sockaddr_in
*) &query
->addr
;
181 ip_fwd
= (struct sockaddr_in
*) &reply
->addr
;
183 if(ip
->sin_addr
.s_addr
== ip_fwd
->sin_addr
.s_addr
)
184 hostname
= reply
->h_name
;
186 else if(query
->type
== QUERY_PTR_AAAA
)
188 struct sockaddr_in6
*ip
, *ip_fwd
;
189 ip
= (struct sockaddr_in6
*) &query
->addr
;
190 ip_fwd
= (struct sockaddr_in6
*) &reply
->addr
;
192 if(memcmp(&ip
->sin6_addr
, &ip_fwd
->sin6_addr
, sizeof(struct in6_addr
)) == 0)
193 hostname
= reply
->h_name
;
197 /* Shouldn't happen */
198 warn_opers(L_CRIT
, "DNS: handle_lookup_hostname_reply: unknown query type %d",
204 query
->callback(hostname
, hostname
!= NULL
, query
->type
, query
->data
);
210 submit_dns_answer(const char *reply
, bool status
, query_type type
, void *data
)
214 if(!id
|| type
== QUERY_INVALID
)
216 warn_opers(L_CRIT
, "DNS: submit_dns_answer gave us a bad query");
220 if(reply
== NULL
|| status
== false)
222 rb_helper_write(authd_helper
, "E %s E %c *", id
, type
);
227 rb_helper_write(authd_helper
, "E %s O %c %s", id
, type
, reply
);
232 handle_resolve_dns(int parc
, char *parv
[])
234 char *id
= rb_strdup(parv
[1]);
235 char qtype
= *parv
[2];
236 char *record
= parv
[3];
237 int aftype
= AF_INET
;
244 if(!lookup_ip(record
, aftype
, submit_dns_answer
, id
))
245 submit_dns_answer(NULL
, false, qtype
, NULL
);
249 if(!lookup_hostname(record
, submit_dns_answer
, id
))
250 submit_dns_answer(NULL
, false, qtype
, NULL
);
253 warn_opers(L_CRIT
, "DNS: handle_resolve_dns got an unknown query: %c", qtype
);
259 enumerate_nameservers(uint32_t rid
, const char letter
)
261 char buf
[(HOSTIPLEN
+ 1) * IRCD_MAXNS
];
266 /* Shouldn't happen */
267 warn_opers(L_CRIT
, "DNS: no name servers!");
268 stats_error(rid
, letter
, "NONAMESERVERS");
272 for(int i
= 0; i
< irc_nscount
; i
++)
274 char addr
[HOSTIPLEN
];
277 rb_inet_ntop_sock((struct sockaddr
*)&irc_nsaddr_list
[i
], addr
, sizeof(addr
));
281 /* Shouldn't happen */
282 warn_opers(L_CRIT
, "DNS: bad nameserver!");
283 stats_error(rid
, letter
, "INVALIDNAMESERVER");
287 addrlen
= strlen(addr
) + 1;
288 (void)snprintf(&buf
[s
], sizeof(buf
) - s
, "%s ", addr
);
295 stats_result(rid
, letter
, "%s", buf
);
299 reload_nameservers(const char letter
)
301 /* Not a whole lot to it */