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#36 server now responds to raw login, quite a hack
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08efbdac69
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@ -838,6 +838,61 @@ tunnel(int tun_fd, int dns_fd, int bind_fd)
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return 0;
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}
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static void
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send_raw(int fd, char *buf, int buflen, int cmd, struct query *q)
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{
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unsigned 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;
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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)
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{
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int userid;
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char myhash[16];
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if (len < 17) return;
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userid = packet[16];
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if (userid < 0 || userid > created_users) return;
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if (!users[userid].active) return;
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login_calculate(myhash, 16, password, users[userid].seed + 1);
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if (memcmp(packet, myhash, 16) == 0) {
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/* Correct hash, reply with hash of seed - 1 */
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users[userid].last_pkt = time(NULL);
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login_calculate(myhash, 16, password, users[userid].seed - 1);
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memcpy(packet, myhash, 16);
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send_raw(fd, packet, 17, RAW_HDR_CMD_LOGIN, q);
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}
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}
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static int
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raw_decode(char *packet, int len, struct query *q, int fd)
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{
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/* minimum length */
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if (len < RAW_HDR_LEN) return 0;
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/* should start with header */
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if (memcmp(packet, raw_header, RAW_HDR_IDENT_LEN)) return 0;
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if (packet[RAW_HDR_CMD] == RAW_HDR_CMD_LOGIN) {
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handle_raw_login(&packet[RAW_HDR_LEN], len - RAW_HDR_LEN, q, fd);
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} else {
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warnx("Unhandled raw command %02X\n", packet[RAW_HDR_CMD]);
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}
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return 1;
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}
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static int
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read_dns(int fd, struct query *q)
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{
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@ -870,11 +925,16 @@ read_dns(int fd, struct query *q)
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#endif /* !WINDOWS32 */
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if (r > 0) {
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memcpy((struct sockaddr*)&q->from, (struct sockaddr*)&from, addrlen);
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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)) {
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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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return 0;
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}
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memcpy((struct sockaddr*)&q->from, (struct sockaddr*)&from, addrlen);
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q->fromlen = addrlen;
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#ifndef WINDOWS32
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for (cmsg = CMSG_FIRSTHDR(&msg); cmsg != NULL;
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