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#21: Reverted [538], reopening
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parent
89232bcaa6
commit
71973f13ef
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@ -127,19 +127,10 @@ send_version_response(int fd, version_ack_t ack, uint32_t payload, struct user *
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write_dns(fd, &u->q, out, sizeof(out));
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}
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static int
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cmp_remote_ip(int userid, struct query *q) {
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struct sockaddr_in *tempin;
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tempin = (struct sockaddr_in *) &(q->from);
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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 int
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tunnel_dns(int tun_fd, int dns_fd)
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{
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struct in_addr tempip;
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struct sockaddr_in *tempin;
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struct user dummy;
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struct ip *hdr;
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unsigned long outlen;
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@ -173,10 +164,9 @@ tunnel_dns(int tun_fd, int dns_fd)
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userid = find_available_user();
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if (userid >= 0) {
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users[userid].seed = rand();
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/* Store remote IP number */
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tempin = (struct sockaddr_in *) &(dummy.q.from);
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memcpy(&(users[userid].host), &(tempin->sin_addr), sizeof(struct in_addr));
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memcpy(&(users[userid].host), &(dummy.q.from), dummy.q.fromlen);
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memcpy(&(users[userid].q), &(dummy.q), sizeof(struct query));
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users[userid].addrlen = dummy.q.fromlen;
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users[userid].encoder = get_base32_encoder();
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send_version_response(dns_fd, VERSION_ACK, users[userid].seed, &users[userid]);
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users[userid].q.id = 0;
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@ -198,7 +188,8 @@ tunnel_dns(int tun_fd, int dns_fd)
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users[userid].last_pkt = time(NULL);
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login_calculate(logindata, 16, password, users[userid].seed);
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if (cmp_remote_ip(userid, &(dummy.q)) != 0) {
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if (dummy.q.fromlen != users[userid].addrlen ||
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memcmp(&(users[userid].host), &(dummy.q.from), dummy.q.fromlen) != 0) {
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write_dns(dns_fd, &(dummy.q), "BADIP", 5);
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} else {
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if (read >= 18 && (memcmp(logindata, unpacked+1, 16) == 0)) {
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@ -229,10 +220,8 @@ tunnel_dns(int tun_fd, int dns_fd)
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write_dns(dns_fd, &(dummy.q), "BADIP", 5);
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return 0; /* illegal id */
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}
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if (cmp_remote_ip(userid, &(dummy.q)) != 0) {
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memcpy(&(users[userid].q), &(dummy.q), sizeof(struct query));
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users[userid].last_pkt = time(NULL);
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}
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} else if(in[0] == 'Z' || in[0] == 'z') {
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/* Case conservation check */
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@ -256,7 +245,8 @@ tunnel_dns(int tun_fd, int dns_fd)
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}
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/* Check sending ip number */
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if (cmp_remote_ip(userid, &(dummy.q)) != 0) {
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if (dummy.q.fromlen != users[userid].addrlen ||
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memcmp(&(users[userid].host), &(dummy.q.from), dummy.q.fromlen) != 0) {
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write_dns(dns_fd, &(dummy.q), "BADIP", 5);
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} else {
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/* decode with this users encoding */
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@ -265,6 +255,7 @@ tunnel_dns(int tun_fd, int dns_fd)
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users[userid].last_pkt = time(NULL);
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memcpy(&(users[userid].q), &(dummy.q), sizeof(struct query));
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users[userid].addrlen = dummy.q.fromlen;
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memcpy(users[userid].inpacket.data + users[userid].inpacket.offset, unpacked, read);
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users[userid].inpacket.len += read;
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users[userid].inpacket.offset += read;
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@ -293,8 +284,8 @@ tunnel_dns(int tun_fd, int dns_fd)
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}
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}
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/* userid must be set for a reply to be sent */
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if (userid >= 0 && userid < USERS &&
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cmp_remote_ip(userid, &(dummy.q)) != 0 &&
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if (userid >= 0 && userid < USERS && dummy.q.fromlen == users[userid].addrlen &&
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memcmp(&(users[userid].host), &(dummy.q.from), dummy.q.fromlen) == 0 &&
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users[userid].outpacket.len > 0) {
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write_dns(dns_fd, &(dummy.q), users[userid].outpacket.data, users[userid].outpacket.len);
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@ -25,7 +25,8 @@ struct user {
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time_t last_pkt;
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int seed;
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in_addr_t tun_ip;
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struct in_addr host;
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struct sockaddr host;
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int addrlen;
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struct query q;
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struct packet inpacket;
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struct packet outpacket;
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