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https://github.com/yarrick/iodine.git
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the seed wasnt saved in the server between it was sent to the client and the client logged in, extracted function for sending version_responses
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parent
a49e400ea9
commit
c538bd0b6d
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@ -67,68 +67,91 @@ sigint(int sig)
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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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unsigned long outlen;
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char out[64*1024];
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char in[64*1024];
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long outlen;
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int read;
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if ((read = read_tun(tun_fd, in, sizeof(in))) <= 0)
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return 0;
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outlen = sizeof(out);
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compress2(out, &outlen, in, read, 9);
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compress2((uint8_t*)out, &outlen, (uint8_t*)in, read, 9);
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memcpy(outpacket.data, out, outlen);
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outpacket.len = outlen;
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return outlen;
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}
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typedef enum {
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VERSION_ACK,
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VERSION_NACK
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} version_ack_t;
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static void
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send_version_response(int fd, version_ack_t ack, uint32_t payload)
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{
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char out[8];
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switch (ack) {
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case VERSION_ACK:
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strncpy(out, "VACK", sizeof(out));
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break;
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case VERSION_NACK:
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strncpy(out, "VNAK", sizeof(out));
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break;
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}
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out[4] = ((payload >> 24) & 0xff);
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out[5] = ((payload >> 16) & 0xff);
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out[6] = ((payload >> 8) & 0xff);
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out[7] = ((payload) & 0xff);
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write_dns(fd, &q, out, 8);
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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 clientip;
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unsigned long outlen;
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struct in_addr myip;
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char logindata[16];
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char out[64*1024];
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char in[64*1024];
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static int seed;
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char *tmp[2];
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long outlen;
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int version;
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int read;
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int code;
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int version;
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int seed;
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int nseed;
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if ((read = read_dns(dns_fd, &q, in, sizeof(in))) <= 0)
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return 0;
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if(in[0] == 'V' || in[0] == 'v') {
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/* Version greeting, compare and send ack/nak */
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if (read >= 5) {
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if (read > 4) {
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/* Received V + 32bits version */
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memcpy(&version, in + 1, 4);
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version = ntohl(version);
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version = (((in[1] & 0xff) << 24) |
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((in[2] & 0xff) << 16) |
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((in[3] & 0xff) << 8) |
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((in[4] & 0xff)));
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if (version == VERSION) {
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seed = rand();
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nseed = htonl(seed);
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strncpy(out, "VACK", sizeof(out));
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memcpy(out+4, &nseed, 4);
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write_dns(dns_fd, &q, out, 8);
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send_version_response(dns_fd, VERSION_ACK, seed);
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} else {
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version = htonl(VERSION);
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strncpy(out, "VNAK", sizeof(out));
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memcpy(out+4, &version, 4);
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write_dns(dns_fd, &q, out, 8);
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send_version_response(dns_fd, VERSION_NACK, VERSION);
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}
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} else {
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version = htonl(VERSION);
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strncpy(out, "VNAK", sizeof(out));
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memcpy(out+4, &version, 4);
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write_dns(dns_fd, &q, out, 8);
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send_version_response(dns_fd, VERSION_NACK, VERSION);
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}
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} else if(in[0] == 'L' || in[0] == 'l') {
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/* Login phase, handle auth */
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login_calculate(logindata, 16, password, seed);
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if (read >= 17 && (memcmp(logindata, in+1, 16) == 0)) {
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/* Login ok, send ip/mtu info */
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myip.s_addr = my_ip;
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@ -173,7 +196,8 @@ tunnel_dns(int tun_fd, int dns_fd)
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if (code & 1) {
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outlen = sizeof(out);
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uncompress(out, &outlen, packetbuf.data, packetbuf.len);
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uncompress((uint8_t*)out, &outlen,
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(uint8_t*)packetbuf.data, packetbuf.len);
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write_tun(tun_fd, out, outlen);
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