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8cf45447 AC |
1 | /* authd/dns.h - header for authd DNS functions |
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" | |
394b8dde | 23 | #include "res.h" |
8cf45447 | 24 | |
1c99f551 EM |
25 | void |
26 | format_address(struct rb_sockaddr_storage *addr, char *buffer, size_t length) | |
27 | { | |
28 | if(GET_SS_FAMILY(addr) == AF_INET) | |
29 | { | |
30 | rb_inet_ntop_sock((struct sockaddr *)addr, buffer, length); | |
31 | } | |
b3265d7a | 32 | #ifdef RB_IPV6 |
1c99f551 EM |
33 | else if(GET_SS_FAMILY(addr) == AF_INET6) |
34 | { | |
35 | char tmpbuf[length]; | |
36 | ||
37 | rb_inet_ntop_sock((struct sockaddr *)addr, tmpbuf, length); | |
38 | ||
39 | if(*tmpbuf == ':') | |
40 | { | |
41 | rb_strlcpy(buffer, "0", length); | |
42 | rb_strlcat(buffer, tmpbuf, length); | |
43 | } | |
44 | else | |
45 | rb_strlcpy(buffer, tmpbuf, length); | |
46 | } | |
b3265d7a EM |
47 | #endif |
48 | } | |
49 | ||
50 | bool | |
51 | sockcmp(struct rb_sockaddr_storage *addr, struct rb_sockaddr_storage *addr2, int family) | |
52 | { | |
53 | if(family == AF_INET) | |
54 | { | |
55 | struct sockaddr_in *ip, *ip2; | |
56 | ip = (struct sockaddr_in *)addr; | |
57 | ip2 = (struct sockaddr_in *)addr2; | |
58 | ||
59 | return ip->sin_addr.s_addr == ip2->sin_addr.s_addr; | |
60 | } | |
61 | #ifdef RB_IPV6 | |
62 | else if(family == AF_INET6) | |
63 | { | |
64 | struct sockaddr_in6 *ip, *ip2; | |
65 | ip = (struct sockaddr_in6 *) addr; | |
66 | ip2 = (struct sockaddr_in6 *) addr2; | |
67 | ||
68 | return(memcmp(&ip->sin6_addr, &ip2->sin6_addr, sizeof(struct in6_addr)) == 0); | |
69 | } | |
70 | #endif | |
71 | ||
72 | return false; | |
1c99f551 EM |
73 | } |
74 | ||
8cf45447 AC |
75 | static void |
76 | submit_dns_answer(void *userdata, struct DNSReply *reply) | |
77 | { | |
78 | struct dns_request *req = userdata; | |
79 | char response[64] = "*"; | |
80 | char status = 'E'; | |
b3265d7a | 81 | int family = AF_INET; |
8cf45447 AC |
82 | |
83 | if (reply == NULL) | |
84 | { | |
c7c009b5 | 85 | rb_helper_write(authd_helper, "E %s E %c *", req->reqid, req->type); |
8cf45447 AC |
86 | goto cleanup; |
87 | } | |
88 | ||
89 | switch (req->type) | |
90 | { | |
91 | case '4': | |
8cf45447 AC |
92 | #ifdef RB_IPV6 |
93 | case '6': | |
1c99f551 | 94 | format_address(&reply->addr, response, sizeof(response)); |
8cf45447 AC |
95 | break; |
96 | #endif | |
8cf45447 AC |
97 | #ifdef RB_IPV6 |
98 | case 'S': | |
b3265d7a EM |
99 | family = AF_INET6; |
100 | #endif | |
101 | case 'R': | |
102 | if(sockcmp(&req->addr, &reply->addr, family) && strlen(reply->h_name) < 63) | |
8cf45447 | 103 | { |
b3265d7a EM |
104 | rb_strlcpy(response, reply->h_name, sizeof(response)); |
105 | status = 'O'; | |
8cf45447 AC |
106 | } |
107 | break; | |
8cf45447 AC |
108 | default: |
109 | exit(7); | |
110 | } | |
111 | ||
c7c009b5 | 112 | rb_helper_write(authd_helper, "E %s %c %c %s", req->reqid, status, req->type, response); |
8cf45447 AC |
113 | cleanup: |
114 | rb_free(req); | |
115 | } | |
116 | ||
117 | void | |
118 | resolve_dns(int parc, char *parv[]) | |
119 | { | |
120 | struct dns_request *req; | |
121 | char *requestid = parv[1]; | |
122 | char *qtype = parv[2]; | |
123 | char *rec = parv[3]; | |
124 | int type; | |
125 | ||
126 | req = rb_malloc(sizeof(*req)); | |
127 | rb_strlcpy(req->reqid, requestid, sizeof(req->reqid)); | |
128 | req->type = *qtype; | |
129 | ||
130 | switch (req->type) | |
131 | { | |
132 | case '4': | |
133 | type = T_A; | |
8cf45447 AC |
134 | break; |
135 | case '6': | |
136 | type = T_AAAA; | |
8cf45447 AC |
137 | break; |
138 | case 'R': | |
139 | case 'S': | |
fa43f559 AC |
140 | if(!rb_inet_pton_sock(rec, (struct sockaddr *) &req->addr)) |
141 | exit(6); | |
8cf45447 AC |
142 | type = T_PTR; |
143 | break; | |
144 | } | |
145 | ||
146 | req->query.ptr = req; | |
147 | req->query.callback = submit_dns_answer; | |
148 | ||
fa43f559 AC |
149 | if (type != T_PTR) |
150 | gethost_byname_type(rec, &req->query, type); | |
151 | else | |
152 | gethost_byaddr(&req->addr, &req->query); | |
8cf45447 | 153 | } |
394b8dde EM |
154 | |
155 | void | |
156 | enumerate_nameservers(const char *rid, const char letter) | |
157 | { | |
158 | char buf[40 * IRCD_MAXNS]; /* Plenty */ | |
159 | char *c = buf; | |
160 | int i; | |
161 | ||
162 | if (!irc_nscount) | |
163 | { | |
164 | /* Shouldn't happen */ | |
165 | rb_helper_write(authd_helper, "X %s %c NONAMESERVERS", rid, letter); | |
166 | return; | |
167 | } | |
168 | ||
169 | for(i = 0; i < irc_nscount; i++) | |
170 | { | |
171 | char addr[40]; | |
172 | int ret; | |
173 | ||
174 | rb_inet_ntop_sock((struct sockaddr *)&irc_nsaddr_list[i], addr, sizeof(addr)); | |
175 | ||
176 | if (!addr[0]) | |
177 | { | |
178 | /* Shouldn't happen */ | |
179 | rb_helper_write(authd_helper, "X %s %c INVALIDNAMESERVER", rid, letter); | |
180 | return; | |
181 | } | |
182 | ||
183 | ret = snprintf(c, 40, "%s ", addr); | |
184 | c += (size_t)ret; | |
185 | } | |
186 | ||
187 | *(--c) = '\0'; | |
188 | ||
189 | rb_helper_write(authd_helper, "Y %s %c %s", rid, letter, buf); | |
190 | } | |
6445c1cf EM |
191 | |
192 | void | |
193 | reload_nameservers(const char letter) | |
194 | { | |
195 | /* Not a whole lot to it */ | |
196 | restart_resolver(); | |
197 | } |