138 lines
3.4 KiB
C
138 lines
3.4 KiB
C
/* authd/dns.h - header for authd DNS functions
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* Copyright (c) 2016 William Pitcock <nenolod@dereferenced.org>
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice is present in all copies.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "authd.h"
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#include "dns.h"
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static void
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submit_dns_answer(void *userdata, struct DNSReply *reply)
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{
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struct dns_request *req = userdata;
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char response[64] = "*";
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char status = 'E';
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if (reply == NULL)
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{
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rb_helper_write(authd_helper, "E %s E %c *", req->reqid, req->type);
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goto cleanup;
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}
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switch (req->type)
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{
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case '4':
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if (GET_SS_FAMILY(&reply->addr) == AF_INET)
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{
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status = 'O';
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rb_inet_ntop_sock((struct sockaddr *) &reply->addr, response, sizeof(response));
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}
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break;
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#ifdef RB_IPV6
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case '6':
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if (GET_SS_FAMILY(&reply->addr) == AF_INET6)
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{
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char tmpres[63];
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rb_inet_ntop_sock((struct sockaddr *) &reply->addr, tmpres, sizeof(tmpres));
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if (*tmpres == ':')
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{
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rb_strlcpy(response, "0", sizeof(response));
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rb_strlcat(response, tmpres, sizeof(response));
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}
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else
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rb_strlcpy(response, tmpres, sizeof(response));
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status = 'O';
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}
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break;
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#endif
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case 'R':
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{
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struct sockaddr_in *ip, *ip_fwd;
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ip = (struct sockaddr_in *) &req->addr;
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ip_fwd = (struct sockaddr_in *) &reply->addr;
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if(ip->sin_addr.s_addr == ip_fwd->sin_addr.s_addr && strlen(reply->h_name) < 63)
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{
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rb_strlcpy(response, reply->h_name, sizeof(response));
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status = 'O';
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}
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}
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break;
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#ifdef RB_IPV6
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case 'S':
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{
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struct sockaddr_in6 *ip, *ip_fwd;
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ip = (struct sockaddr_in6 *) &req->addr;
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ip_fwd = (struct sockaddr_in6 *) &reply->addr;
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if(memcmp(&ip->sin6_addr, &ip_fwd->sin6_addr, sizeof(struct in6_addr)) == 0 && strlen(reply->h_name) < 63)
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{
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rb_strlcpy(response, reply->h_name, sizeof(response));
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status = 'O';
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}
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}
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break;
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#endif
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default:
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exit(7);
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}
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rb_helper_write(authd_helper, "E %s %c %c %s", req->reqid, status, req->type, response);
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cleanup:
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rb_free(req);
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}
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void
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resolve_dns(int parc, char *parv[])
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{
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struct dns_request *req;
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char *requestid = parv[1];
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char *qtype = parv[2];
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char *rec = parv[3];
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int type;
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req = rb_malloc(sizeof(*req));
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rb_strlcpy(req->reqid, requestid, sizeof(req->reqid));
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req->type = *qtype;
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switch (req->type)
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{
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case '4':
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type = T_A;
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break;
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case '6':
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type = T_AAAA;
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break;
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case 'R':
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case 'S':
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if(!rb_inet_pton_sock(rec, (struct sockaddr *) &req->addr))
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exit(6);
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type = T_PTR;
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break;
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}
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req->query.ptr = req;
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req->query.callback = submit_dns_answer;
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if (type != T_PTR)
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gethost_byname_type(rec, &req->query, type);
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else
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gethost_byaddr(&req->addr, &req->query);
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}
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