mirrors/iodine
1
0
Fork 0
mirror of https://github.com/yarrick/iodine.git synced 2024-11-22 06:41:26 +00:00
Code Issues Packages Projects Releases Wiki Activity

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

Browse source
This commit is contained in:
Bjorn Andersson 2007-02-10 22:17:11 +00:00
parent a49e400ea9
commit c538bd0b6d
1 changed files with 46 additions and 22 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

68
src/iodined.c
View file

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