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Extract version checking to function

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This commit is contained in:
Erik Ekman 2007-12-01 21:46:13 +00:00
parent b55c3f432b
commit 212a3b93e6
1 changed files with 39 additions and 28 deletions
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67
src/iodined.c
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@ -124,6 +124,44 @@ send_version_response(int fd, version_ack_t ack, uint32_t payload, struct user *
write_dns(fd, &u->q, out, sizeof(out)); write_dns(fd, &u->q, out, sizeof(out));
} }
static void
handle_version(int dns_fd, char *in, int len)
{
char unpacked[64*1024];
struct user dummy;
int read;
int version;
int userid;
read = unpack_data(unpacked, sizeof(unpacked), &(in[1]), len - 1, b32);
/* Version greeting, compare and send ack/nak */
if (read > 4) {
/* Received V + 32bits version */
version = (((unpacked[0] & 0xff) << 24) |
((unpacked[1] & 0xff) << 16) |
((unpacked[2] & 0xff) << 8) |
((unpacked[3] & 0xff)));
}
if (version == VERSION) {
userid = find_available_user();
if (userid >= 0) {
users[userid].seed = rand();
memcpy(&(users[userid].host), &(dummy.q.from), dummy.q.fromlen);
memcpy(&(users[userid].q), &(dummy.q), sizeof(struct query));
users[userid].addrlen = dummy.q.fromlen;
users[userid].encoder = get_base32_encoder();
send_version_response(dns_fd, VERSION_ACK, users[userid].seed, &users[userid]);
users[userid].q.id = 0;
} else {
/* No space for another user */
send_version_response(dns_fd, VERSION_FULL, USERS, &dummy);
}
} else {
send_version_response(dns_fd, VERSION_NACK, VERSION, &dummy);
}
}
static int static int
tunnel_dns(int tun_fd, int dns_fd) tunnel_dns(int tun_fd, int dns_fd)
{ {
@ -138,7 +176,6 @@ tunnel_dns(int tun_fd, int dns_fd)
char *tmp[2]; char *tmp[2];
int userid; int userid;
int touser; int touser;
int version;
int read; int read;
int code; int code;
@ -147,33 +184,7 @@ tunnel_dns(int tun_fd, int dns_fd)
return 0; return 0;
if(in[0] == 'V' || in[0] == 'v') { if(in[0] == 'V' || in[0] == 'v') {
read = unpack_data(unpacked, sizeof(unpacked), &(in[1]), read - 1, b32); handle_version(dns_fd, in, read);
/* Version greeting, compare and send ack/nak */
if (read > 4) {
/* Received V + 32bits version */
version = (((unpacked[0] & 0xff) << 24) |
((unpacked[1] & 0xff) << 16) |
((unpacked[2] & 0xff) << 8) |
((unpacked[3] & 0xff)));
}
if (version == VERSION) {
userid = find_available_user();
if (userid >= 0) {
users[userid].seed = rand();
memcpy(&(users[userid].host), &(dummy.q.from), dummy.q.fromlen);
memcpy(&(users[userid].q), &(dummy.q), sizeof(struct query));
users[userid].addrlen = dummy.q.fromlen;
users[userid].encoder = get_base32_encoder();
send_version_response(dns_fd, VERSION_ACK, users[userid].seed, &users[userid]);
users[userid].q.id = 0;
} else {
/* No space for another user */
send_version_response(dns_fd, VERSION_FULL, USERS, &dummy);
}
} else {
send_version_response(dns_fd, VERSION_NACK, VERSION, &dummy);
}
} else if(in[0] == 'L' || in[0] == 'l') { } else if(in[0] == 'L' || in[0] == 'l') {
read = unpack_data(unpacked, sizeof(unpacked), &(in[1]), read - 1, b32); read = unpack_data(unpacked, sizeof(unpacked), &(in[1]), read - 1, b32);
/* Login phase, handle auth */ /* Login phase, handle auth */