mirror of
https://github.com/yarrick/iodine.git
synced 2024-11-23 10:05:08 +00:00
Prepare server code for IPv6 listening socket
Add a struct with multiple dns file descriptors (for IPv4 and IPv6) and pass this to required areas. Choose which descriptor to use when sending by looking at the destination address family.
This commit is contained in:
Erik Ekman
parent
3069665646
commit
07c2fd4068
150
src/iodined.c
150
src/iodined.c
@ -95,12 +95,31 @@ static int debug;
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static char *__progname;
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#endif
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static int read_dns(int, int, struct query *);
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static void write_dns(int, struct query *, char *, int, char);
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static void handle_full_packet(int, int, int);
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/* Struct with IPv4 and IPv6 file descriptors.
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* Need to be passed on down to tunneling code since we can get a
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* packet on one fd meant for a user on the other.
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*/
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struct dnsfd {
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int v4fd;
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int v6fd;
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};
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static int read_dns(int fd, struct dnsfd *dns_fds, int tun_fd, struct query *q);
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static void write_dns(int fd, struct query *q, char *data, int datalen, char downenc);
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static void handle_full_packet(int tun_fd, struct dnsfd *dns_fds, int userid);
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static int
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get_dns_fd(struct dnsfd *fds, struct sockaddr_storage *addr)
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{
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if (addr->ss_family == AF_INET6) {
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return fds->v6fd;
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}
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return fds->v4fd;
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}
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/* Ask ipify.org webservice to get external ip */
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static int get_external_ip(struct in_addr *ip)
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static int
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get_external_ip(struct in_addr *ip)
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{
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int sock;
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struct addrinfo *addr;
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@ -624,7 +643,7 @@ send_chunk_or_dataless(int dns_fd, int userid, struct query *q)
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}
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static int
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tunnel_tun(int tun_fd, int dns_fd)
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tunnel_tun(int tun_fd, struct dnsfd *dns_fds)
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{
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unsigned long outlen;
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struct ip *header;
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@ -659,13 +678,17 @@ tunnel_tun(int tun_fd, int dns_fd)
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start_new_outpacket(userid, out, outlen);
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/* Start sending immediately if query is waiting */
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if (users[userid].q_sendrealsoon.id != 0)
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if (users[userid].q_sendrealsoon.id != 0) {
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int dns_fd = get_dns_fd(dns_fds, &users[userid].q_sendrealsoon.from);
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send_chunk_or_dataless(dns_fd, userid, &users[userid].q_sendrealsoon);
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else if (users[userid].q.id != 0)
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} else if (users[userid].q.id != 0) {
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int dns_fd = get_dns_fd(dns_fds, &users[userid].q.from);
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send_chunk_or_dataless(dns_fd, userid, &users[userid].q);
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}
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return outlen;
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} else { /* CONN_RAW_UDP */
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int dns_fd = get_dns_fd(dns_fds, &users[userid].q.from);
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send_raw(dns_fd, out, outlen, userid, RAW_HDR_CMD_DATA, &users[userid].q);
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return outlen;
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}
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@ -742,7 +765,7 @@ process_downstream_ack(int userid, int down_seq, int down_frag)
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}
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static void
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handle_null_request(int tun_fd, int dns_fd, struct query *q, int domain_len)
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handle_null_request(int tun_fd, int dns_fd, struct dnsfd *dns_fds, struct query *q, int domain_len)
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{
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struct in_addr tempip;
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char in[512];
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@ -1420,7 +1443,7 @@ handle_null_request(int tun_fd, int dns_fd, struct query *q, int domain_len)
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}
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if (upstream_ok && lastfrag) { /* packet is complete */
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handle_full_packet(tun_fd, dns_fd, userid);
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handle_full_packet(tun_fd, dns_fds, userid);
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}
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/* If there is a query that must be returned real soon, do it.
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@ -1594,13 +1617,14 @@ forward_query(int bind_fd, struct query *q)
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}
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static int
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tunnel_bind(int bind_fd, int dns_fd)
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tunnel_bind(int bind_fd, struct dnsfd *dns_fds)
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{
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char packet[64*1024];
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struct sockaddr_storage from;
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socklen_t fromlen;
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struct fw_query *query;
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unsigned short id;
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int dns_fd;
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int r;
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fromlen = sizeof(struct sockaddr);
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@ -1630,6 +1654,7 @@ tunnel_bind(int bind_fd, int dns_fd)
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format_addr(&query->addr, query->addrlen), (id & 0xffff), r);
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}
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dns_fd = get_dns_fd(dns_fds, &query->addr);
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if (sendto(dns_fd, packet, r, 0, (const struct sockaddr *) &(query->addr),
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query->addrlen) <= 0) {
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warn("forward reply error");
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@ -1639,14 +1664,14 @@ tunnel_bind(int bind_fd, int dns_fd)
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}
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static int
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tunnel_dns(int tun_fd, int dns_fd, int bind_fd)
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tunnel_dns(int tun_fd, int dns_fd, struct dnsfd *dns_fds, int bind_fd)
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{
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struct query q;
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int read;
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int domain_len;
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int inside_topdomain = 0;
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if ((read = read_dns(dns_fd, tun_fd, &q)) <= 0)
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if ((read = read_dns(dns_fd, dns_fds, tun_fd, &q)) <= 0)
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return 0;
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if (debug >= 2) {
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@ -1694,7 +1719,7 @@ tunnel_dns(int tun_fd, int dns_fd, int bind_fd)
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case T_SRV:
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case T_TXT:
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/* encoding is "transparent" here */
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handle_null_request(tun_fd, dns_fd, &q, domain_len);
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handle_null_request(tun_fd, dns_fd, dns_fds, &q, domain_len);
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break;
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case T_NS:
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handle_ns_request(dns_fd, &q);
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@ -1712,7 +1737,7 @@ tunnel_dns(int tun_fd, int dns_fd, int bind_fd)
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}
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static int
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tunnel(int tun_fd, int dns_fd, int bind_fd, int max_idle_time)
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tunnel(int tun_fd, struct dnsfd *dns_fds, int bind_fd, int max_idle_time)
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{
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struct timeval tv;
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fd_set fds;
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@ -1745,8 +1770,8 @@ tunnel(int tun_fd, int dns_fd, int bind_fd, int max_idle_time)
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FD_ZERO(&fds);
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FD_SET(dns_fd, &fds);
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maxfd = dns_fd;
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FD_SET(dns_fds->v4fd, &fds);
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maxfd = dns_fds->v4fd;
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if (bind_fd) {
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/* wait for replies from real DNS */
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@ -1783,15 +1808,15 @@ tunnel(int tun_fd, int dns_fd, int bind_fd, int max_idle_time)
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}
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}
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}
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} else {
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if (FD_ISSET(tun_fd, &fds)) {
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tunnel_tun(tun_fd, dns_fd);
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}
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if (FD_ISSET(dns_fd, &fds)) {
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tunnel_dns(tun_fd, dns_fd, bind_fd);
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}
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} else {
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if (FD_ISSET(tun_fd, &fds)) {
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tunnel_tun(tun_fd, dns_fds);
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}
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if (FD_ISSET(dns_fds->v4fd, &fds)) {
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tunnel_dns(tun_fd, dns_fds->v4fd, dns_fds, bind_fd);
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}
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if (FD_ISSET(bind_fd, &fds)) {
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tunnel_bind(bind_fd, dns_fd);
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tunnel_bind(bind_fd, dns_fds);
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}
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}
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@ -1801,15 +1826,17 @@ tunnel(int tun_fd, int dns_fd, int bind_fd, int max_idle_time)
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users[userid].last_pkt + 60 > time(NULL) &&
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users[userid].q_sendrealsoon.id != 0 &&
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users[userid].conn == CONN_DNS_NULL &&
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!users[userid].q_sendrealsoon_new)
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!users[userid].q_sendrealsoon_new) {
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int dns_fd = get_dns_fd(dns_fds, &users[userid].q_sendrealsoon.from);
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send_chunk_or_dataless(dns_fd, userid, &users[userid].q_sendrealsoon);
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}
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}
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return 0;
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}
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static void
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handle_full_packet(int tun_fd, int dns_fd, int userid)
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handle_full_packet(int tun_fd, struct dnsfd *dns_fds, int userid)
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{
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unsigned long outlen;
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char out[64*1024];
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@ -1838,10 +1865,13 @@ handle_full_packet(int tun_fd, int dns_fd, int userid)
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users[userid].inpacket.len);
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/* Start sending immediately if query is waiting */
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if (users[touser].q_sendrealsoon.id != 0)
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if (users[touser].q_sendrealsoon.id != 0) {
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int dns_fd = get_dns_fd(dns_fds, &users[touser].q_sendrealsoon.from);
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send_chunk_or_dataless(dns_fd, touser, &users[touser].q_sendrealsoon);
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else if (users[touser].q.id != 0)
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} else if (users[touser].q.id != 0) {
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int dns_fd = get_dns_fd(dns_fds, &users[touser].q.from);
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send_chunk_or_dataless(dns_fd, touser, &users[touser].q);
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}
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#ifdef OUTPACKETQ_LEN
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} else {
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save_to_outpacketq(touser,
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@ -1850,6 +1880,7 @@ handle_full_packet(int tun_fd, int dns_fd, int userid)
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#endif
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}
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} else{ /* CONN_RAW_UDP */
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int dns_fd = get_dns_fd(dns_fds, &users[touser].q.from);
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send_raw(dns_fd, users[userid].inpacket.data,
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users[userid].inpacket.len, touser,
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RAW_HDR_CMD_DATA, &users[touser].q);
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@ -1905,7 +1936,7 @@ handle_raw_login(char *packet, int len, struct query *q, int fd, int userid)
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}
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static void
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handle_raw_data(char *packet, int len, struct query *q, int dns_fd, int tun_fd, int userid)
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handle_raw_data(char *packet, int len, struct query *q, struct dnsfd *dns_fds, int tun_fd, int userid)
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{
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if (check_authenticated_user_and_ip(userid, q) != 0) {
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return;
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@ -1926,7 +1957,7 @@ handle_raw_data(char *packet, int len, struct query *q, int dns_fd, int tun_fd,
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users[userid].inpacket.len, userid);
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}
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handle_full_packet(tun_fd, dns_fd, userid);
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handle_full_packet(tun_fd, dns_fds, userid);
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}
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static void
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@ -1950,7 +1981,7 @@ handle_raw_ping(struct query *q, int dns_fd, int userid)
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}
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static int
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raw_decode(char *packet, int len, struct query *q, int dns_fd, int tun_fd)
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raw_decode(char *packet, int len, struct query *q, int dns_fd, struct dnsfd *dns_fds, int tun_fd)
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{
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int raw_user;
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@ -1967,7 +1998,7 @@ raw_decode(char *packet, int len, struct query *q, int dns_fd, int tun_fd)
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break;
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case RAW_HDR_CMD_DATA:
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/* Data packet */
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handle_raw_data(&packet[RAW_HDR_LEN], len - RAW_HDR_LEN, q, dns_fd, tun_fd, raw_user);
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handle_raw_data(&packet[RAW_HDR_LEN], len - RAW_HDR_LEN, q, dns_fds, tun_fd, raw_user);
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break;
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case RAW_HDR_CMD_PING:
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/* Keepalive packet */
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@ -1981,7 +2012,8 @@ raw_decode(char *packet, int len, struct query *q, int dns_fd, int tun_fd)
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}
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static int
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read_dns(int fd, int tun_fd, struct query *q) /* FIXME: tun_fd is because of raw_decode() below */
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read_dns(int fd, struct dnsfd *dns_fds, int tun_fd, struct query *q)
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/* FIXME: dns_fds and tun_fd are because of raw_decode() below */
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{
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struct sockaddr_in from;
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socklen_t addrlen;
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@ -2016,7 +2048,7 @@ read_dns(int fd, int tun_fd, struct query *q) /* FIXME: tun_fd is because of raw
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q->fromlen = addrlen;
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/* TODO do not handle raw packets here! */
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if (raw_decode(packet, r, q, fd, tun_fd)) {
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if (raw_decode(packet, r, q, fd, dns_fds, tun_fd)) {
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return 0;
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}
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if (dns_decode(NULL, 0, q, QR_QUERY, packet, r) < 0) {
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@ -2262,7 +2294,7 @@ int
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main(int argc, char **argv)
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{
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extern char *__progname;
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char *listen_ip;
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char *listen_ip4;
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char *errormsg;
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#ifndef WINDOWS32
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struct passwd *pw;
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@ -2273,7 +2305,7 @@ main(int argc, char **argv)
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char *context;
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char *device;
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char *pidfile;
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int dnsd_fd;
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struct dnsfd dns_fds;
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int tun_fd;
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/* settings for forwarding normal DNS to
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@ -2289,8 +2321,8 @@ main(int argc, char **argv)
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int ns_get_externalip;
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int retval;
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int max_idle_time = 0;
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struct sockaddr_storage dnsaddr;
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int dnsaddr_len;
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struct sockaddr_storage dns4addr;
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int dns4addr_len;
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#ifdef HAVE_SYSTEMD
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int nb_fds;
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#endif
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@ -2308,7 +2340,7 @@ main(int argc, char **argv)
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bind_fd = 0;
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mtu = 1130; /* Very many relays give fragsize 1150 or slightly
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higher for NULL; tun/zlib adds ~17 bytes. */
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listen_ip = NULL;
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listen_ip4 = NULL;
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port = 53;
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ns_ip = INADDR_ANY;
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ns_get_externalip = 0;
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@ -2374,7 +2406,7 @@ main(int argc, char **argv)
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mtu = atoi(optarg);
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break;
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case 'l':
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listen_ip = optarg;
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listen_ip4 = optarg;
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break;
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case 'p':
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port = atoi(optarg);
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@ -2471,14 +2503,14 @@ main(int argc, char **argv)
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foreground = 1;
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}
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dnsaddr_len = get_addr(listen_ip, port, AF_INET, AI_PASSIVE | AI_NUMERICHOST, &dnsaddr);
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if (dnsaddr_len < 0) {
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dns4addr_len = get_addr(listen_ip4, port, AF_INET, AI_PASSIVE | AI_NUMERICHOST, &dns4addr);
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if (dns4addr_len < 0) {
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warnx("Bad IP address to listen on.");
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usage();
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}
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if(bind_enable) {
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in_addr_t dns_ip = ((struct sockaddr_in *) &dnsaddr)->sin_addr.s_addr;
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in_addr_t dns_ip = ((struct sockaddr_in *) &dns4addr)->sin_addr.s_addr;
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if (bind_port < 1 || bind_port > 65535) {
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warnx("Bad DNS server port number given.");
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usage();
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@ -2526,30 +2558,36 @@ main(int argc, char **argv)
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if ((tun_fd = open_tun(device)) == -1) {
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retval = 1;
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goto cleanup0;
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goto cleanup_none;
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}
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if (!skipipconfig) {
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const char *other_ip = users_get_first_ip();
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if (tun_setip(argv[0], other_ip, netmask) != 0 || tun_setmtu(mtu) != 0) {
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retval = 1;
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free((void*) other_ip);
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goto cleanup1;
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goto cleanup_tun;
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}
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free((void*) other_ip);
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}
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/* Mark both file descriptors as unused */
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dns_fds.v4fd = -1;
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dns_fds.v6fd = -1;
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#ifdef HAVE_SYSTEMD
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nb_fds = sd_listen_fds(0);
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if (nb_fds > 1) {
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retval = 1;
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warnx("Too many file descriptors received!\n");
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goto cleanup1;
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goto cleanup_tun;
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} else if (nb_fds == 1) {
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dnsd_fd = SD_LISTEN_FDS_START;
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/* XXX: assume we get IPv4 socket */
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dns_fds.v4fd = SD_LISTEN_FDS_START;
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} else {
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#endif
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if ((dnsd_fd = open_dns(&dnsaddr, dnsaddr_len)) < 0) {
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if ((dns_fds.v4fd = open_dns(&dns4addr, dns4addr_len)) < 0) {
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retval = 1;
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goto cleanup2;
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goto cleanup_tun;
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}
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#ifdef HAVE_SYSTEMD
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}
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@ -2557,7 +2595,7 @@ main(int argc, char **argv)
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if (bind_enable) {
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if ((bind_fd = open_dns_from_host(NULL, 0, AF_INET, 0)) < 0) {
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retval = 1;
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goto cleanup3;
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goto cleanup_dns4;
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}
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}
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@ -2602,16 +2640,16 @@ main(int argc, char **argv)
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syslog(LOG_INFO, "started, listening on port %d", port);
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tunnel(tun_fd, dnsd_fd, bind_fd, max_idle_time);
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tunnel(tun_fd, &dns_fds, bind_fd, max_idle_time);
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|
||||
syslog(LOG_INFO, "stopping");
|
||||
cleanup3:
|
||||
close_dns(bind_fd);
|
||||
cleanup2:
|
||||
close_dns(dnsd_fd);
|
||||
cleanup1:
|
||||
cleanup_dns4:
|
||||
if (dns_fds.v4fd >= 0)
|
||||
close_dns(dns_fds.v4fd);
|
||||
cleanup_tun:
|
||||
close_tun(tun_fd);
|
||||
cleanup0:
|
||||
cleanup_none:
|
||||
|
||||
return retval;
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user