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revert [607], [608] and parts of [611]

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This commit is contained in:
Erik Ekman 2007-12-01 23:02:06 +00:00
parent 3b7927b2dc
commit c8726f2c5d
1 changed files with 69 additions and 92 deletions
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161
src/iodined.c
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@ -82,8 +82,10 @@ tunnel_tun(int tun_fd, int dns_fd)
compress2((uint8_t*)out, &outlen, (uint8_t*)in, read, 9);
/* if another packet is queued, throw away this one. TODO build queue */
if (packet_empty(&(users[userid].outpacket)) == 0) {
return packet_fill(&(users[userid].outpacket), out, outlen);
if (users[userid].outpacket.len == 0) {
memcpy(users[userid].outpacket.data, out, outlen);
users[userid].outpacket.len = outlen;
return outlen;
} else {
return 0;
}
@ -122,103 +124,21 @@ send_version_response(int fd, version_ack_t ack, uint32_t payload, struct user *
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
handle_login(int dns_fd, char *in, int len)
{
char data[64*1024];
char logindata[16];
struct in_addr tempip;
char *tmp[2];
struct user dummy;
int read;
int userid;
read = unpack_data(data, sizeof(data), &(in[1]), len - 1, b32);
/* Login phase, handle auth */
userid = data[0];
if (userid < 0 || userid >= USERS) {
write_dns(dns_fd, &(dummy.q), "BADIP", 5);
return -1; /* illegal id */
}
users[userid].last_pkt = time(NULL);
login_calculate(logindata, 16, password, users[userid].seed);
if (dummy.q.fromlen != users[userid].addrlen ||
memcmp(&(users[userid].host), &(dummy.q.from), dummy.q.fromlen) != 0) {
write_dns(dns_fd, &(dummy.q), "BADIP", 5);
} else {
if (read >= 18 && (memcmp(logindata, data+1, 16) == 0)) {
/* Login ok, send ip/mtu info */
tempip.s_addr = my_ip;
tmp[0] = strdup(inet_ntoa(tempip));
tempip.s_addr = users[userid].tun_ip;
tmp[1] = strdup(inet_ntoa(tempip));
read = snprintf(data, sizeof(data), "%s-%s-%d",
tmp[0], tmp[1], my_mtu);
write_dns(dns_fd, &(dummy.q), data, read);
dummy.q.id = 0;
free(tmp[1]);
free(tmp[0]);
} else {
write_dns(dns_fd, &(dummy.q), "LNAK", 4);
}
}
return userid;
}
static int
tunnel_dns(int tun_fd, int dns_fd)
{
struct in_addr tempip;
struct user dummy;
struct ip *hdr;
unsigned long outlen;
char logindata[16];
char out[64*1024];
char in[64*1024];
char unpacked[64*1024];
char *tmp[2];
int userid;
int touser;
int version;
int read;
int code;
@ -227,11 +147,68 @@ tunnel_dns(int tun_fd, int dns_fd)
return 0;
if(in[0] == 'V' || in[0] == 'v') {
handle_version(dns_fd, in, read);
read = unpack_data(unpacked, sizeof(unpacked), &(in[1]), read - 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);
}
} else if(in[0] == 'L' || in[0] == 'l') {
userid = handle_login(dns_fd, in, read);
if (userid == -1)
return 0; /* illegal user id */
read = unpack_data(unpacked, sizeof(unpacked), &(in[1]), read - 1, b32);
/* Login phase, handle auth */
userid = unpacked[0];
if (userid < 0 || userid >= USERS) {
write_dns(dns_fd, &(dummy.q), "BADIP", 5);
return 0; /* illegal id */
}
users[userid].last_pkt = time(NULL);
login_calculate(logindata, 16, password, users[userid].seed);
if (dummy.q.fromlen != users[userid].addrlen ||
memcmp(&(users[userid].host), &(dummy.q.from), dummy.q.fromlen) != 0) {
write_dns(dns_fd, &(dummy.q), "BADIP", 5);
} else {
if (read >= 18 && (memcmp(logindata, unpacked+1, 16) == 0)) {
/* Login ok, send ip/mtu info */
tempip.s_addr = my_ip;
tmp[0] = strdup(inet_ntoa(tempip));
tempip.s_addr = users[userid].tun_ip;
tmp[1] = strdup(inet_ntoa(tempip));
read = snprintf(out, sizeof(out), "%s-%s-%d",
tmp[0], tmp[1], my_mtu);
write_dns(dns_fd, &(dummy.q), out, read);
dummy.q.id = 0;
free(tmp[1]);
free(tmp[0]);
} else {
write_dns(dns_fd, &(dummy.q), "LNAK", 4);
}
}
} else if(in[0] == 'P' || in[0] == 'p') {
read = unpack_data(unpacked, sizeof(unpacked), &(in[1]), read - 1, b32);
/* Ping packet, store userid */