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https://github.com/yarrick/iodine.git
synced 2024-11-08 02:19:18 +02:00
Now fetches destination address from udp packets
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parent
c96b83e3d2
commit
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@ -104,6 +104,9 @@ open_dns(int localport, in_addr_t listen_ip)
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#endif
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setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &flag, sizeof(flag));
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/* To get destination address from each UDP datagram, see iodined.c:read_dns() */
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setsockopt(fd, IPPROTO_IP, DSTADDR_SOCKOPT, &flag, sizeof(flag));
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if(bind(fd, (struct sockaddr*)&addr, sizeof(addr)) < 0)
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err(1, "bind");
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@ -30,6 +30,14 @@
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#define QUERY_NAME_SIZE 256
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#if defined IP_RECVDSTADDR
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# define DSTADDR_SOCKOPT IP_RECVDSTADDR
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# define dstaddr(x) (CMSG_DATA(x))
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#elif defined IP_PKTINFO
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# define DSTADDR_SOCKOPT IP_PKTINFO
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# define dstaddr(x) (&(((struct in_pktinfo *)(CMSG_DATA(x)))->ipi_addr))
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#endif
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struct packet
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{
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int len; /* Total packet length */
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@ -42,6 +50,7 @@ struct query {
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char name[QUERY_NAME_SIZE];
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short type;
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short id;
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struct in_addr destination;
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struct sockaddr from;
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int fromlen;
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};
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@ -510,17 +510,39 @@ static int
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read_dns(int fd, struct query *q)
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{
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struct sockaddr_in from;
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char packet[64*1024];
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socklen_t addrlen;
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char packet[64*1024];
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char address[96];
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struct msghdr msg;
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struct iovec iov;
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struct cmsghdr *cmsg;
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int r;
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addrlen = sizeof(struct sockaddr);
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r = recvfrom(fd, packet, sizeof(packet), 0, (struct sockaddr*)&from, &addrlen);
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iov.iov_base = packet;
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iov.iov_len = sizeof(packet);
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msg.msg_name = (caddr_t) &from;
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msg.msg_namelen = (unsigned) addrlen;
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msg.msg_iov = &iov;
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msg.msg_iovlen = 1;
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msg.msg_control = address;
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msg.msg_controllen = sizeof(address);
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msg.msg_flags = 0;
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r = recvmsg(fd, &msg, 0);
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if (r > 0) {
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dns_decode(NULL, 0, q, QR_QUERY, packet, r);
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memcpy((struct sockaddr*)&q->from, (struct sockaddr*)&from, addrlen);
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q->fromlen = addrlen;
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for (cmsg = CMSG_FIRSTHDR(&msg); cmsg != NULL; cmsg = CMSG_NXTHDR(&msg, cmsg)) {
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if (cmsg->cmsg_level == IPPROTO_IP && cmsg->cmsg_type == DSTADDR_SOCKOPT) {
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q->destination = *dstaddr(cmsg);
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break;
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}
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}
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return strlen(q->name);
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} else if (r < 0) {
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