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https://github.com/yarrick/iodine.git
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#36, basic raw mode tunnel works
This commit is contained in:
Erik Ekman
parent
5d3b502ec6
commit
186ba79bd1
3 changed files with 103 additions and 74 deletions
105
src/iodine.c
105
src/iodine.c
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@ -189,58 +189,77 @@ is_sending()
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}
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static int
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read_dns(int fd, char *buf, int buflen)
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read_dns(int dns_fd, int tun_fd, char *buf, int buflen) /* FIXME: tun_fd needed for raw handling */
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{
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struct sockaddr_in from;
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char data[64*1024];
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socklen_t addrlen;
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struct query q;
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int rv;
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int r;
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addrlen = sizeof(struct sockaddr);
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if ((r = recvfrom(fd, data, sizeof(data), 0,
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if ((r = recvfrom(dns_fd, data, sizeof(data), 0,
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(struct sockaddr*)&from, &addrlen)) == -1) {
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warn("recvfrom");
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return 0;
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}
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rv = dns_decode(buf, buflen, &q, QR_ANSWER, data, r);
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if (conn == CONN_DNS_NULL) {
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int rv;
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/* decode the data header, update seqno and frag before next request */
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if (rv >= 2) {
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downstream_seqno = (buf[1] >> 5) & 7;
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downstream_fragment = (buf[1] >> 1) & 15;
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}
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if (is_sending()) {
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if (chunkid == q.id) {
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/* Got ACK on sent packet */
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outpkt.offset += outpkt.sentlen;
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if (outpkt.offset == outpkt.len) {
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/* Packet completed */
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outpkt.offset = 0;
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outpkt.len = 0;
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outpkt.sentlen = 0;
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/* If the ack contains unacked frag number but no data,
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* send a ping to ack the frag number and get more data*/
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if (rv == 2 && (
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downstream_seqno != down_ack_seqno ||
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downstream_fragment != down_ack_fragment
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)) {
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send_ping(fd);
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}
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} else {
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/* More to send */
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send_chunk(fd);
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}
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rv = dns_decode(buf, buflen, &q, QR_ANSWER, data, r);
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/* decode the data header, update seqno and frag before next request */
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if (rv >= 2) {
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downstream_seqno = (buf[1] >> 5) & 7;
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downstream_fragment = (buf[1] >> 1) & 15;
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}
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if (is_sending()) {
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if (chunkid == q.id) {
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/* Got ACK on sent packet */
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outpkt.offset += outpkt.sentlen;
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if (outpkt.offset == outpkt.len) {
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/* Packet completed */
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outpkt.offset = 0;
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outpkt.len = 0;
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outpkt.sentlen = 0;
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/* If the ack contains unacked frag number but no data,
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* send a ping to ack the frag number and get more data*/
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if (rv == 2 && (
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downstream_seqno != down_ack_seqno ||
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downstream_fragment != down_ack_fragment
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)) {
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send_ping(dns_fd);
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}
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} else {
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/* More to send */
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send_chunk(dns_fd);
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}
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}
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}
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return rv;
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} else { /* CONN_RAW_UDP */
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unsigned long datalen;
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char buf[64*1024];
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int raw_user;
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/* minimum length */
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if (r < RAW_HDR_LEN) return 0;
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/* should start with header */
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if (memcmp(data, raw_header, RAW_HDR_IDENT_LEN)) return 0;
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/* should be data packet */
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if (RAW_HDR_GET_CMD(data) != RAW_HDR_CMD_DATA) return 0;
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raw_user = RAW_HDR_GET_USR(data);
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if (uncompress((uint8_t*)buf, &datalen, (uint8_t*) &data[RAW_HDR_LEN], r) == Z_OK) {
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write_tun(tun_fd, buf, datalen);
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}
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return 0;
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}
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return rv;
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}
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@ -283,7 +302,7 @@ tunnel_dns(int tun_fd, int dns_fd)
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char buf[64*1024];
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size_t read;
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if ((read = read_dns(dns_fd, buf, sizeof(buf))) <= 2)
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if ((read = read_dns(dns_fd, tun_fd, buf, sizeof(buf))) <= 2)
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return -1;
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if (downstream_seqno != inpkt.seqno) {
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@ -578,7 +597,7 @@ handshake_version(int dns_fd, int *seed)
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r = select(dns_fd + 1, &fds, NULL, NULL, &tv);
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if(r > 0) {
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read = read_dns(dns_fd, in, sizeof(in));
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read = read_dns(dns_fd, 0, in, sizeof(in));
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if(read <= 0) {
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if (read == 0) {
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@ -646,7 +665,7 @@ handshake_login(int dns_fd, int seed)
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r = select(dns_fd + 1, &fds, NULL, NULL, &tv);
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if(r > 0) {
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read = read_dns(dns_fd, in, sizeof(in));
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read = read_dns(dns_fd, 0, in, sizeof(in));
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if(read <= 0) {
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warn("read");
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@ -707,7 +726,7 @@ handshake_raw_udp(int dns_fd, int seed)
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r = select(dns_fd + 1, &fds, NULL, NULL, &tv);
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if(r > 0) {
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len = read_dns(dns_fd, in, sizeof(in));
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len = read_dns(dns_fd, 0, in, sizeof(in));
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if (len == 5 && in[0] == 'I') {
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/* Received IP address */
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remoteaddr = (in[1] & 0xff);
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@ -800,7 +819,7 @@ handshake_case_check(int dns_fd)
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r = select(dns_fd + 1, &fds, NULL, NULL, &tv);
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if(r > 0) {
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read = read_dns(dns_fd, in, sizeof(in));
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read = read_dns(dns_fd, 0, in, sizeof(in));
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if (read > 0) {
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if (in[0] == 'z' || in[0] == 'Z') {
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@ -864,7 +883,7 @@ handshake_switch_codec(int dns_fd)
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r = select(dns_fd + 1, &fds, NULL, NULL, &tv);
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if(r > 0) {
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read = read_dns(dns_fd, in, sizeof(in));
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read = read_dns(dns_fd, 0, in, sizeof(in));
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if (read > 0) {
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if (strncmp("BADLEN", in, 6) == 0) {
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@ -918,7 +937,7 @@ handshake_autoprobe_fragsize(int dns_fd)
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r = select(dns_fd + 1, &fds, NULL, NULL, &tv);
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if(r > 0) {
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read = read_dns(dns_fd, in, sizeof(in));
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read = read_dns(dns_fd, 0, in, sizeof(in));
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if (read > 0) {
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/* We got a reply */
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@ -989,7 +1008,7 @@ handshake_set_fragsize(int dns_fd, int fragsize)
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r = select(dns_fd + 1, &fds, NULL, NULL, &tv);
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if(r > 0) {
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read = read_dns(dns_fd, in, sizeof(in));
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read = read_dns(dns_fd, 0, in, sizeof(in));
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if (read > 0) {
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int accepted_fragsize;
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@ -123,6 +123,9 @@ check_user_and_ip(int userid, struct query *q)
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if (!users[userid].active) {
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return 1;
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}
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if (users[userid].last_pkt + 60 < time(NULL)) {
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return 1;
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}
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/* return early if IP checking is disabled */
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if (!check_ip) {
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@ -133,6 +136,24 @@ check_user_and_ip(int userid, struct query *q)
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return memcmp(&(users[userid].host), &(tempin->sin_addr), sizeof(struct in_addr));
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}
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static void
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send_raw(int fd, char *buf, int buflen, int user, int cmd, struct query *q)
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{
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char packet[4096];
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int len;
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len = MIN(sizeof(packet) - RAW_HDR_LEN, buflen);
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memcpy(packet, raw_header, RAW_HDR_LEN);
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memcpy(&packet[RAW_HDR_LEN], buf, len);
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len += RAW_HDR_LEN;
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packet[RAW_HDR_CMD] = cmd | (user & 0x0F);
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sendto(fd, packet, len, 0, &q->from, q->fromlen);
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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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{
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@ -155,17 +176,22 @@ tunnel_tun(int tun_fd, int dns_fd)
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outlen = sizeof(out);
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compress2((uint8_t*)out, &outlen, (uint8_t*)in, read, 9);
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/* if another packet is queued, throw away this one. TODO build queue */
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if (users[userid].outpacket.len == 0) {
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memcpy(users[userid].outpacket.data, out, outlen);
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users[userid].outpacket.len = outlen;
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users[userid].outpacket.offset = 0;
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users[userid].outpacket.sentlen = 0;
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users[userid].outpacket.seqno = (++users[userid].outpacket.seqno & 7);
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users[userid].outpacket.fragment = 0;
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if (users[userid].conn == CONN_DNS_NULL) {
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/* if another packet is queued, throw away this one. TODO build queue */
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if (users[userid].outpacket.len == 0) {
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memcpy(users[userid].outpacket.data, out, outlen);
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users[userid].outpacket.len = outlen;
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users[userid].outpacket.offset = 0;
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users[userid].outpacket.sentlen = 0;
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users[userid].outpacket.seqno = (++users[userid].outpacket.seqno & 7);
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users[userid].outpacket.fragment = 0;
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return outlen;
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} else {
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return 0;
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}
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} else { /* CONN_RAW_UDP */
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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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} else {
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return 0;
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}
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}
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@ -790,7 +816,7 @@ tunnel(int tun_fd, int dns_fd, int bind_fd)
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if (i==0) {
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int j;
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for (j = 0; j < USERS; j++) {
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if (users[j].q.id != 0) {
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if (users[j].q.id != 0 && users[j].conn == CONN_DNS_NULL) {
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send_chunk(dns_fd, j);
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}
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}
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@ -848,23 +874,6 @@ handle_full_packet(int tun_fd, int userid)
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users[userid].inpacket.len = users[userid].inpacket.offset = 0;
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}
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static void
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send_raw(int fd, char *buf, int buflen, int user, int cmd, struct query *q)
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{
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char packet[4096];
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int len;
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len = MIN(sizeof(packet) - RAW_HDR_LEN, buflen);
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memcpy(packet, raw_header, RAW_HDR_LEN);
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memcpy(&packet[RAW_HDR_LEN], buf, len);
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len += RAW_HDR_LEN;
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packet[RAW_HDR_CMD] = cmd | (user & 0x0F);
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sendto(fd, packet, len, 0, &q->from, q->fromlen);
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}
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static void
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handle_raw_login(char *packet, int len, struct query *q, int fd, int userid)
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{
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@ -931,7 +940,6 @@ raw_decode(char *packet, int len, struct query *q, int dns_fd, int tun_fd)
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if (memcmp(packet, raw_header, RAW_HDR_IDENT_LEN)) return 0;
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raw_user = RAW_HDR_GET_USR(packet);
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printf("raw %02x\n", packet[RAW_HDR_CMD]);
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switch (RAW_HDR_GET_CMD(packet)) {
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case RAW_HDR_CMD_LOGIN:
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/* Login challenge */
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@ -106,7 +106,7 @@ users_waiting_on_reply()
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for (i = 0; i < USERS; i++) {
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if (users[i].active && !users[i].disabled &&
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users[i].last_pkt + 60 > time(NULL) &&
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users[i].q.id != 0) {
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users[i].q.id != 0 && users[i].conn == CONN_DNS_NULL) {
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ret++;
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}
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}
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@ -144,7 +144,9 @@ all_users_waiting_to_send()
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for (i = 0; i < USERS; i++) {
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if (users[i].active && !users[i].disabled &&
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users[i].last_pkt + 60 > now &&
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users[i].outpacket.len == 0) {
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((users[i].outpacket.len == 0 && users[i].conn == CONN_DNS_NULL)
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|| users[i].conn == CONN_RAW_UDP)) {
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ret = 0;
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break;
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}
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