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Extract login handling to function
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commit
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@ -162,18 +162,63 @@ handle_version(int dns_fd, char *in, int len)
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}
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}
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static int
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handle_login(int dns_fd, char *in, int len)
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{
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char data[64*1024];
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char logindata[16];
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struct in_addr tempip;
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char *tmp[2];
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struct user dummy;
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int read;
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int userid;
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read = unpack_data(data, sizeof(data), &(in[1]), len - 1, b32);
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/* Login phase, handle auth */
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userid = data[0];
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if (userid < 0 || userid >= USERS) {
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write_dns(dns_fd, &(dummy.q), "BADIP", 5);
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return -1; /* illegal id */
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}
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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 (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, data+1, 16) == 0)) {
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/* Login ok, send ip/mtu info */
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tempip.s_addr = my_ip;
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tmp[0] = strdup(inet_ntoa(tempip));
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tempip.s_addr = users[userid].tun_ip;
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tmp[1] = strdup(inet_ntoa(tempip));
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read = snprintf(data, sizeof(data), "%s-%s-%d",
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tmp[0], tmp[1], my_mtu);
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write_dns(dns_fd, &(dummy.q), data, read);
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dummy.q.id = 0;
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free(tmp[1]);
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free(tmp[0]);
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} else {
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write_dns(dns_fd, &(dummy.q), "LNAK", 4);
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}
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}
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return userid;
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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 user dummy;
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struct ip *hdr;
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unsigned long outlen;
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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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char unpacked[64*1024];
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char *tmp[2];
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int userid;
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int touser;
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int read;
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@ -186,40 +231,9 @@ tunnel_dns(int tun_fd, int dns_fd)
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if(in[0] == 'V' || in[0] == 'v') {
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handle_version(dns_fd, in, read);
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} else if(in[0] == 'L' || in[0] == 'l') {
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read = unpack_data(unpacked, sizeof(unpacked), &(in[1]), read - 1, b32);
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/* Login phase, handle auth */
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userid = unpacked[0];
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if (userid < 0 || userid >= USERS) {
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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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users[userid].last_pkt = time(NULL);
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login_calculate(logindata, 16, password, users[userid].seed);
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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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/* Login ok, send ip/mtu info */
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tempip.s_addr = my_ip;
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tmp[0] = strdup(inet_ntoa(tempip));
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tempip.s_addr = users[userid].tun_ip;
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tmp[1] = strdup(inet_ntoa(tempip));
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read = snprintf(out, sizeof(out), "%s-%s-%d",
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tmp[0], tmp[1], my_mtu);
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write_dns(dns_fd, &(dummy.q), out, read);
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dummy.q.id = 0;
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free(tmp[1]);
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free(tmp[0]);
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} else {
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write_dns(dns_fd, &(dummy.q), "LNAK", 4);
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}
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}
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userid = handle_login(dns_fd, in, read);
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if (userid == -1)
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return 0; /* illegal user id */
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} else if(in[0] == 'P' || in[0] == 'p') {
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read = unpack_data(unpacked, sizeof(unpacked), &(in[1]), read - 1, b32);
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/* Ping packet, store userid */
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