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#36 server now responds to raw login, quite a hack

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This commit is contained in:
Erik Ekman 2009-06-14 13:31:35 +00:00
parent 08efbdac69
commit b37d5481cd
1 changed files with 62 additions and 2 deletions
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64
src/iodined.c
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@ -838,6 +838,61 @@ tunnel(int tun_fd, int dns_fd, int bind_fd)
return 0;
}
static void
send_raw(int fd, char *buf, int buflen, int cmd, struct query *q)
{
unsigned char packet[4096];
int len;
len = MIN(sizeof(packet) - RAW_HDR_LEN, buflen);
memcpy(packet, raw_header, RAW_HDR_LEN);
memcpy(&packet[RAW_HDR_LEN], buf, len);
len += RAW_HDR_LEN;
packet[RAW_HDR_CMD] = cmd;
sendto(fd, packet, len, 0, &q->from, q->fromlen);
}
static void
handle_raw_login(char *packet, int len, struct query *q, int fd)
{
int userid;
char myhash[16];
if (len < 17) return;
userid = packet[16];
if (userid < 0 || userid > created_users) return;
if (!users[userid].active) return;
login_calculate(myhash, 16, password, users[userid].seed + 1);
if (memcmp(packet, myhash, 16) == 0) {
/* Correct hash, reply with hash of seed - 1 */
users[userid].last_pkt = time(NULL);
login_calculate(myhash, 16, password, users[userid].seed - 1);
memcpy(packet, myhash, 16);
send_raw(fd, packet, 17, RAW_HDR_CMD_LOGIN, q);
}
}
static int
raw_decode(char *packet, int len, struct query *q, int fd)
{
/* minimum length */
if (len < RAW_HDR_LEN) return 0;
/* should start with header */
if (memcmp(packet, raw_header, RAW_HDR_IDENT_LEN)) return 0;
if (packet[RAW_HDR_CMD] == RAW_HDR_CMD_LOGIN) {
handle_raw_login(&packet[RAW_HDR_LEN], len - RAW_HDR_LEN, q, fd);
} else {
warnx("Unhandled raw command %02X\n", packet[RAW_HDR_CMD]);
}
return 1;
}
static int
read_dns(int fd, struct query *q)
{
@ -870,11 +925,16 @@ read_dns(int fd, struct query *q)
#endif /* !WINDOWS32 */
if (r > 0) {
memcpy((struct sockaddr*)&q->from, (struct sockaddr*)&from, addrlen);
q->fromlen = addrlen;
/* TODO do not handle raw packets here! */
if (raw_decode(packet, r, q, fd)) {
return 0;
}
if (dns_decode(NULL, 0, q, QR_QUERY, packet, r) < 0) {
return 0;
}
memcpy((struct sockaddr*)&q->from, (struct sockaddr*)&from, addrlen);
q->fromlen = addrlen;
#ifndef WINDOWS32
for (cmsg = CMSG_FIRSTHDR(&msg); cmsg != NULL;