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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" | |
23 | ||
24 | static void | |
25 | submit_dns_answer(void *userdata, struct DNSReply *reply) | |
26 | { | |
27 | struct dns_request *req = userdata; | |
28 | char response[64] = "*"; | |
29 | char status = 'E'; | |
30 | ||
31 | if (reply == NULL) | |
32 | { | |
33 | rb_helper_write(authd_helper, "E %s E %c *", req->reqid, req->type); | |
34 | goto cleanup; | |
35 | } | |
36 | ||
37 | switch (req->type) | |
38 | { | |
39 | case '4': | |
40 | if (GET_SS_FAMILY(&reply->addr) == AF_INET) | |
41 | { | |
42 | status = 'O'; | |
43 | rb_inet_ntop_sock((struct sockaddr *) &reply->addr, response, sizeof(response)); | |
44 | } | |
45 | break; | |
46 | #ifdef RB_IPV6 | |
47 | case '6': | |
48 | if (GET_SS_FAMILY(&reply->addr) == AF_INET6) | |
49 | { | |
50 | char tmpres[63]; | |
51 | rb_inet_ntop_sock((struct sockaddr *) &reply->addr, tmpres, sizeof(tmpres)); | |
52 | ||
53 | if (*tmpres == ':') | |
54 | { | |
55 | rb_strlcpy(response, "0", sizeof(response)); | |
56 | rb_strlcat(response, tmpres, sizeof(response)); | |
57 | } | |
58 | else | |
59 | rb_strlcpy(response, tmpres, sizeof(response)); | |
60 | ||
61 | status = 'O'; | |
62 | } | |
63 | break; | |
64 | #endif | |
65 | case 'R': | |
66 | { | |
67 | struct sockaddr_in *ip, *ip_fwd; | |
68 | ip = (struct sockaddr_in *) &req->addr; | |
69 | ip_fwd = (struct sockaddr_in *) &reply->addr; | |
70 | ||
71 | if(ip->sin_addr.s_addr == ip_fwd->sin_addr.s_addr && strlen(reply->h_name) < 63) | |
72 | { | |
73 | rb_strlcpy(response, reply->h_name, sizeof(response)); | |
74 | status = 'O'; | |
75 | } | |
76 | } | |
77 | break; | |
78 | #ifdef RB_IPV6 | |
79 | case 'S': | |
80 | { | |
81 | struct sockaddr_in6 *ip, *ip_fwd; | |
82 | ip = (struct sockaddr_in6 *) &req->addr; | |
83 | ip_fwd = (struct sockaddr_in6 *) &reply->addr; | |
84 | ||
85 | if(memcmp(&ip->sin6_addr, &ip_fwd->sin6_addr, sizeof(struct in6_addr)) == 0 && strlen(reply->h_name) < 63) | |
86 | { | |
87 | rb_strlcpy(response, reply->h_name, sizeof(response)); | |
88 | status = 'O'; | |
89 | } | |
90 | } | |
91 | break; | |
92 | #endif | |
93 | default: | |
94 | exit(7); | |
95 | } | |
96 | ||
97 | rb_helper_write(authd_helper, "E %s %c %c %s", req->reqid, status, req->type, response); | |
98 | cleanup: | |
99 | rb_free(req); | |
100 | } | |
101 | ||
102 | void | |
103 | resolve_dns(int parc, char *parv[]) | |
104 | { | |
105 | struct dns_request *req; | |
106 | char *requestid = parv[1]; | |
107 | char *qtype = parv[2]; | |
108 | char *rec = parv[3]; | |
109 | int type; | |
110 | ||
111 | req = rb_malloc(sizeof(*req)); | |
112 | rb_strlcpy(req->reqid, requestid, sizeof(req->reqid)); | |
113 | req->type = *qtype; | |
114 | ||
115 | switch (req->type) | |
116 | { | |
117 | case '4': | |
118 | type = T_A; | |
119 | break; | |
120 | case '6': | |
121 | type = T_AAAA; | |
122 | break; | |
123 | case 'R': | |
124 | case 'S': | |
125 | if(!rb_inet_pton_sock(rec, (struct sockaddr *) &req->addr)) | |
126 | exit(6); | |
127 | type = T_PTR; | |
128 | break; | |
129 | } | |
130 | ||
131 | req->query.ptr = req; | |
132 | req->query.callback = submit_dns_answer; | |
133 | ||
134 | if (type != T_PTR) | |
135 | gethost_byname_type(rec, &req->query, type); | |
136 | else | |
137 | gethost_byaddr(&req->addr, &req->query); | |
138 | } |