mirror of
https://github.com/yarrick/iodine.git
synced 2024-11-03 06:57:27 +00:00
#11 basic support for multiple users. some work left
This commit is contained in:
parent
7994402806
commit
8d766e2857
|
@ -43,9 +43,16 @@ struct query {
|
|||
};
|
||||
|
||||
struct user {
|
||||
int id;
|
||||
char id;
|
||||
int active;
|
||||
time_t last_pkt;
|
||||
int seed;
|
||||
in_addr_t tun_ip;
|
||||
struct sockaddr host;
|
||||
int addrlen;
|
||||
struct query q;
|
||||
struct packet inpacket;
|
||||
struct packet outpacket;
|
||||
};
|
||||
|
||||
int open_dns(int, in_addr_t);
|
||||
|
|
40
src/iodine.c
40
src/iodine.c
|
@ -54,6 +54,7 @@ uint16_t rand_seed;
|
|||
|
||||
/* Current IP packet */
|
||||
static char activepacket[4096];
|
||||
static char userid;
|
||||
static int lastlen;
|
||||
static int packetpos;
|
||||
static int packetlen;
|
||||
|
@ -223,10 +224,12 @@ tunnel(int tun_fd, int dns_fd)
|
|||
static void
|
||||
send_chunk(int fd)
|
||||
{
|
||||
char hex[] = "0123456789ABCDEF";
|
||||
char packet[4096];
|
||||
struct query q;
|
||||
char buf[4096];
|
||||
int avail;
|
||||
int code;
|
||||
char *p;
|
||||
int len;
|
||||
|
||||
|
@ -238,11 +241,14 @@ send_chunk(int fd)
|
|||
avail = packetlen - packetpos;
|
||||
|
||||
lastlen = dns_build_hostname(buf + 1, sizeof(buf) - 1, p, avail, topdomain);
|
||||
if (lastlen == avail)
|
||||
buf[0] = '1';
|
||||
else
|
||||
buf[0] = '0';
|
||||
|
||||
if (lastlen == avail)
|
||||
code = 1;
|
||||
else
|
||||
code = 0;
|
||||
|
||||
code |= (userid << 1);
|
||||
buf[0] = hex[code];
|
||||
len = dns_encode(packet, sizeof(packet), &q, QR_QUERY, buf, strlen(buf));
|
||||
|
||||
sendto(fd, packet, len, 0, (struct sockaddr*)&peer, sizeof(peer));
|
||||
|
@ -251,13 +257,14 @@ send_chunk(int fd)
|
|||
void
|
||||
send_login(int fd, char *login, int len)
|
||||
{
|
||||
char data[18];
|
||||
char data[19];
|
||||
|
||||
memset(data, 0, sizeof(data));
|
||||
memcpy(data, login, MIN(len, 16));
|
||||
data[0] = userid;
|
||||
memcpy(&data[1], login, MIN(len, 16));
|
||||
|
||||
data[16] = (rand_seed >> 8) & 0xff;
|
||||
data[17] = (rand_seed >> 0) & 0xff;
|
||||
data[17] = (rand_seed >> 8) & 0xff;
|
||||
data[18] = (rand_seed >> 0) & 0xff;
|
||||
|
||||
rand_seed++;
|
||||
|
||||
|
@ -267,7 +274,7 @@ send_login(int fd, char *login, int len)
|
|||
static void
|
||||
send_ping(int fd)
|
||||
{
|
||||
char data[2];
|
||||
char data[3];
|
||||
|
||||
if (is_sending()) {
|
||||
lastlen = 0;
|
||||
|
@ -275,8 +282,9 @@ send_ping(int fd)
|
|||
packetlen = 0;
|
||||
}
|
||||
|
||||
data[0] = (rand_seed >> 8) & 0xff;
|
||||
data[1] = (rand_seed >> 0) & 0xff;
|
||||
data[0] = userid;
|
||||
data[1] = (rand_seed >> 8) & 0xff;
|
||||
data[2] = (rand_seed >> 0) & 0xff;
|
||||
|
||||
rand_seed++;
|
||||
|
||||
|
@ -336,7 +344,7 @@ handshake(int dns_fd)
|
|||
continue;
|
||||
}
|
||||
|
||||
if (read >= 8) {
|
||||
if (read >= 9) {
|
||||
payload = (((in[4] & 0xff) << 24) |
|
||||
((in[5] & 0xff) << 16) |
|
||||
((in[6] & 0xff) << 8) |
|
||||
|
@ -344,13 +352,17 @@ handshake(int dns_fd)
|
|||
|
||||
if (strncmp("VACK", in, 4) == 0) {
|
||||
seed = payload;
|
||||
userid = in[8];
|
||||
|
||||
printf("Version ok, both running 0x%08x\n", VERSION);
|
||||
printf("Version ok, both running 0x%08x. You are user #%d\n", VERSION, userid);
|
||||
goto perform_login;
|
||||
} else {
|
||||
} else if (strncmp("VACK", in, 4) == 0) {
|
||||
errx(1, "you run 0x%08x, server runs 0x%08x. giving up\n",
|
||||
VERSION, payload);
|
||||
/* NOTREACHED */
|
||||
} else if (strncmp("VFUL", in, 4) == 0) {
|
||||
errx(1, "server full, all %d slots are taken. try again later\n", payload);
|
||||
/* NOTREACHED */
|
||||
}
|
||||
} else
|
||||
warnx("did not receive proper login challenge\n");
|
||||
|
|
228
src/iodined.c
228
src/iodined.c
|
@ -30,6 +30,7 @@
|
|||
#include <pwd.h>
|
||||
#include <arpa/inet.h>
|
||||
#include <netinet/in.h>
|
||||
#include <netinet/ip.h>
|
||||
#include <zlib.h>
|
||||
|
||||
#include "common.h"
|
||||
|
@ -41,15 +42,10 @@
|
|||
|
||||
int running = 1;
|
||||
|
||||
struct packet packetbuf;
|
||||
struct packet outpacket;
|
||||
int outid;
|
||||
|
||||
char *topdomain;
|
||||
|
||||
struct query q;
|
||||
|
||||
struct user u;
|
||||
#define USERS 8
|
||||
struct user users[USERS];
|
||||
char password[33];
|
||||
|
||||
int my_mtu;
|
||||
|
@ -64,34 +60,96 @@ sigint(int sig)
|
|||
running = 0;
|
||||
}
|
||||
|
||||
static void
|
||||
init_users()
|
||||
{
|
||||
int i;
|
||||
char newip[16];
|
||||
|
||||
memset(users, 0, USERS * sizeof(struct user));
|
||||
for (i = 0; i < USERS; i++) {
|
||||
users[i].id = i;
|
||||
snprintf(newip, sizeof(newip), "0.0.0.%d", i + 1);
|
||||
users[i].tun_ip = my_ip + inet_addr(newip);;
|
||||
users[i].inpacket.len = 0;
|
||||
users[i].inpacket.offset = 0;
|
||||
users[i].outpacket.len = 0;
|
||||
users[i].q.id = 0;
|
||||
}
|
||||
}
|
||||
|
||||
static int
|
||||
find_user_by_ip(uint32_t ip)
|
||||
{
|
||||
int ret = -1;
|
||||
int i;
|
||||
|
||||
for (i = 0; i < USERS; i++) {
|
||||
/* Not used at all or not used in one minute */
|
||||
if (users[i].active && users[i].last_pkt + 60 > time(NULL) &&
|
||||
ip == users[i].tun_ip) {
|
||||
ret = i;
|
||||
break;
|
||||
}
|
||||
}
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int
|
||||
find_available_user()
|
||||
{
|
||||
int ret = -1;
|
||||
int i;
|
||||
|
||||
for (i = 0; i < USERS; i++) {
|
||||
/* Not used at all or not used in one minute */
|
||||
if (!users[i].active || users[i].last_pkt + 60 < time(NULL)) {
|
||||
users[i].active = 1;
|
||||
users[i].last_pkt = time(NULL);
|
||||
ret = i;
|
||||
break;
|
||||
}
|
||||
}
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int
|
||||
tunnel_tun(int tun_fd, int dns_fd)
|
||||
{
|
||||
unsigned long outlen;
|
||||
struct iphdr *header;
|
||||
char out[64*1024];
|
||||
char in[64*1024];
|
||||
int userid;
|
||||
int read;
|
||||
|
||||
if ((read = read_tun(tun_fd, in, sizeof(in))) <= 0)
|
||||
return 0;
|
||||
|
||||
/* find target ip in packet, in is padded with 4 bytes TUN header */
|
||||
header = (struct iphdr*) (in + 4);
|
||||
userid = find_user_by_ip(header->daddr);
|
||||
if (userid < 0)
|
||||
return 0;
|
||||
|
||||
outlen = sizeof(out);
|
||||
compress2((uint8_t*)out, &outlen, (uint8_t*)in, read, 9);
|
||||
memcpy(outpacket.data, out, outlen);
|
||||
outpacket.len = outlen;
|
||||
memcpy(users[userid].outpacket.data, out, outlen);
|
||||
users[userid].outpacket.len = outlen;
|
||||
|
||||
return outlen;
|
||||
}
|
||||
|
||||
typedef enum {
|
||||
VERSION_ACK,
|
||||
VERSION_NACK
|
||||
VERSION_NACK,
|
||||
VERSION_FULL
|
||||
} version_ack_t;
|
||||
|
||||
static void
|
||||
send_version_response(int fd, version_ack_t ack, uint32_t payload)
|
||||
send_version_response(int fd, version_ack_t ack, uint32_t payload, struct user *u)
|
||||
{
|
||||
char out[8];
|
||||
char out[9];
|
||||
|
||||
switch (ack) {
|
||||
case VERSION_ACK:
|
||||
|
@ -100,31 +158,37 @@ send_version_response(int fd, version_ack_t ack, uint32_t payload)
|
|||
case VERSION_NACK:
|
||||
strncpy(out, "VNAK", sizeof(out));
|
||||
break;
|
||||
case VERSION_FULL:
|
||||
strncpy(out, "VFUL", sizeof(out));
|
||||
break;
|
||||
}
|
||||
|
||||
out[4] = ((payload >> 24) & 0xff);
|
||||
out[5] = ((payload >> 16) & 0xff);
|
||||
out[6] = ((payload >> 8) & 0xff);
|
||||
out[7] = ((payload) & 0xff);
|
||||
out[8] = u->id;
|
||||
|
||||
write_dns(fd, &q, out, 8);
|
||||
|
||||
write_dns(fd, &u->q, out, sizeof(out));
|
||||
}
|
||||
|
||||
static int
|
||||
tunnel_dns(int tun_fd, int dns_fd)
|
||||
{
|
||||
struct in_addr clientip;
|
||||
struct in_addr tempip;
|
||||
struct query q;
|
||||
unsigned long outlen;
|
||||
struct in_addr myip;
|
||||
char logindata[16];
|
||||
char out[64*1024];
|
||||
char in[64*1024];
|
||||
static int seed;
|
||||
char *tmp[2];
|
||||
int userid;
|
||||
int version;
|
||||
int read;
|
||||
int code;
|
||||
|
||||
userid = -1;
|
||||
if ((read = read_dns(dns_fd, &q, in, sizeof(in))) <= 0)
|
||||
return 0;
|
||||
|
||||
|
@ -139,41 +203,63 @@ tunnel_dns(int tun_fd, int dns_fd)
|
|||
((in[4] & 0xff)));
|
||||
|
||||
if (version == VERSION) {
|
||||
seed = rand();
|
||||
|
||||
send_version_response(dns_fd, VERSION_ACK, seed);
|
||||
userid = find_available_user();
|
||||
if (userid >= 0) {
|
||||
users[userid].seed = rand();
|
||||
memcpy(&(users[userid].host), &(q.from), q.fromlen);
|
||||
memcpy(&(users[userid].q), &q, sizeof(struct query));
|
||||
users[userid].addrlen = q.fromlen;
|
||||
send_version_response(dns_fd, VERSION_ACK, users[userid].seed, &users[userid]);
|
||||
} else {
|
||||
/* No space for another user */
|
||||
send_version_response(dns_fd, VERSION_FULL, USERS, NULL);
|
||||
}
|
||||
} else {
|
||||
send_version_response(dns_fd, VERSION_NACK, VERSION);
|
||||
send_version_response(dns_fd, VERSION_NACK, VERSION, NULL);
|
||||
}
|
||||
} else {
|
||||
send_version_response(dns_fd, VERSION_NACK, VERSION);
|
||||
send_version_response(dns_fd, VERSION_NACK, VERSION, NULL);
|
||||
}
|
||||
} else if(in[0] == 'L' || in[0] == 'l') {
|
||||
/* Login phase, handle auth */
|
||||
login_calculate(logindata, 16, password, seed);
|
||||
userid = in[1];
|
||||
if (userid < 0 || userid >= USERS) {
|
||||
write_dns(dns_fd, &q, "BADIP", 5);
|
||||
return 0; /* illegal id */
|
||||
}
|
||||
users[userid].last_pkt = time(NULL);
|
||||
login_calculate(logindata, 16, password, users[userid].seed);
|
||||
|
||||
if (read >= 17 && (memcmp(logindata, in+1, 16) == 0)) {
|
||||
/* Login ok, send ip/mtu info */
|
||||
myip.s_addr = my_ip;
|
||||
clientip.s_addr = my_ip + inet_addr("0.0.0.1");
|
||||
|
||||
tmp[0] = strdup(inet_ntoa(myip));
|
||||
tmp[1] = strdup(inet_ntoa(clientip));
|
||||
|
||||
read = snprintf(out, sizeof(out), "%s-%s-%d",
|
||||
tmp[0], tmp[1], my_mtu);
|
||||
|
||||
/* Store user ip */
|
||||
memcpy(&(u.host), &(q.from), q.fromlen);
|
||||
u.addrlen = q.fromlen;
|
||||
|
||||
write_dns(dns_fd, &q, out, read);
|
||||
q.id = 0;
|
||||
|
||||
free(tmp[1]);
|
||||
free(tmp[0]);
|
||||
if (q.fromlen != users[userid].addrlen ||
|
||||
memcmp(&(users[userid].host), &(q.from), q.fromlen) != 0) {
|
||||
write_dns(dns_fd, &q, "BADIP", 5);
|
||||
} else {
|
||||
write_dns(dns_fd, &q, "LNAK", 4);
|
||||
if (read >= 18 && (memcmp(logindata, in+2, 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, &q, out, read);
|
||||
q.id = 0;
|
||||
|
||||
free(tmp[1]);
|
||||
free(tmp[0]);
|
||||
} else {
|
||||
write_dns(dns_fd, &q, "LNAK", 4);
|
||||
}
|
||||
}
|
||||
} else if(in[0] == 'P' || in[0] == 'p') {
|
||||
/* Ping packet, store userid */
|
||||
userid = in[1];
|
||||
if (userid < 0 || userid >= USERS) {
|
||||
write_dns(dns_fd, &q, "BADIP", 5);
|
||||
return 0; /* illegal id */
|
||||
}
|
||||
} else if((in[0] >= '0' && in[0] <= '9')
|
||||
|| (in[0] >= 'a' && in[0] <= 'f')
|
||||
|
@ -185,32 +271,40 @@ tunnel_dns(int tun_fd, int dns_fd)
|
|||
if ((in[0] >= 'A' && in[0] <= 'F'))
|
||||
code = in[0] - 'A' + 10;
|
||||
|
||||
userid = code >> 1;
|
||||
if (userid < 0 || userid >= USERS) {
|
||||
write_dns(dns_fd, &q, "BADIP", 5);
|
||||
return 0; /* illegal id */
|
||||
}
|
||||
users[userid].last_pkt = time(NULL);
|
||||
|
||||
/* Check sending ip number */
|
||||
if (q.fromlen != u.addrlen ||
|
||||
memcmp(&(u.host), &(q.from), q.fromlen) != 0) {
|
||||
if (q.fromlen != users[userid].addrlen ||
|
||||
memcmp(&(users[userid].host), &(q.from), q.fromlen) != 0) {
|
||||
write_dns(dns_fd, &q, "BADIP", 5);
|
||||
} else {
|
||||
memcpy(packetbuf.data + packetbuf.offset, in + 1, read - 1);
|
||||
packetbuf.len += read - 1;
|
||||
packetbuf.offset += read - 1;
|
||||
memcpy(users[userid].inpacket.data + users[userid].inpacket.offset, in + 1, read - 1);
|
||||
users[userid].inpacket.len += read - 1;
|
||||
users[userid].inpacket.offset += read - 1;
|
||||
|
||||
if (code & 1) {
|
||||
outlen = sizeof(out);
|
||||
uncompress((uint8_t*)out, &outlen,
|
||||
(uint8_t*)packetbuf.data, packetbuf.len);
|
||||
(uint8_t*)users[userid].inpacket.data, users[userid].inpacket.len);
|
||||
|
||||
write_tun(tun_fd, out, outlen);
|
||||
|
||||
packetbuf.len = packetbuf.offset = 0;
|
||||
users[userid].inpacket.len = users[userid].inpacket.offset = 0;
|
||||
}
|
||||
}
|
||||
}
|
||||
if (q.fromlen == u.addrlen &&
|
||||
memcmp(&(u.host), &(q.from), q.fromlen) == 0 &&
|
||||
outpacket.len > 0) {
|
||||
/* userid must be set for a reply to be sent */
|
||||
if (userid >= 0 && userid < USERS && q.fromlen == users[userid].addrlen &&
|
||||
memcmp(&(users[userid].host), &(q.from), q.fromlen) == 0 &&
|
||||
users[userid].outpacket.len > 0) {
|
||||
|
||||
write_dns(dns_fd, &q, outpacket.data, outpacket.len);
|
||||
outpacket.len = 0;
|
||||
write_dns(dns_fd, &q, users[userid].outpacket.data, users[userid].outpacket.len);
|
||||
users[userid].outpacket.len = 0;
|
||||
q.id = 0;
|
||||
}
|
||||
|
||||
|
@ -223,18 +317,19 @@ tunnel(int tun_fd, int dns_fd)
|
|||
struct timeval tv;
|
||||
fd_set fds;
|
||||
int i;
|
||||
int j;
|
||||
|
||||
while (running) {
|
||||
if (q.id != 0) {
|
||||
//if (q.id != 0) {
|
||||
tv.tv_sec = 0;
|
||||
tv.tv_usec = 5000;
|
||||
} else {
|
||||
/*} else {
|
||||
tv.tv_sec = 1;
|
||||
tv.tv_usec = 0;
|
||||
}
|
||||
}*/
|
||||
|
||||
FD_ZERO(&fds);
|
||||
if(outpacket.len == 0)
|
||||
//if(outpacket.len == 0) TODO fix this
|
||||
FD_SET(tun_fd, &fds);
|
||||
FD_SET(dns_fd, &fds);
|
||||
|
||||
|
@ -247,10 +342,12 @@ tunnel(int tun_fd, int dns_fd)
|
|||
}
|
||||
|
||||
if (i==0) {
|
||||
if (q.id != 0) {
|
||||
write_dns(dns_fd, &q, outpacket.data, outpacket.len);
|
||||
outpacket.len = 0;
|
||||
q.id = 0;
|
||||
for (j = 0; j < USERS; j++) {
|
||||
if (users[j].q.id != 0) {
|
||||
write_dns(dns_fd, &(users[j].q), users[j].outpacket.data, users[j].outpacket.len);
|
||||
users[j].outpacket.len = 0;
|
||||
users[j].q.id = 0;
|
||||
}
|
||||
}
|
||||
} else {
|
||||
if(FD_ISSET(tun_fd, &fds)) {
|
||||
|
@ -370,10 +467,6 @@ main(int argc, char **argv)
|
|||
listen_ip = INADDR_ANY;
|
||||
port = 53;
|
||||
|
||||
packetbuf.len = 0;
|
||||
packetbuf.offset = 0;
|
||||
outpacket.len = 0;
|
||||
q.id = 0;
|
||||
memset(password, 0, 33);
|
||||
srand(time(NULL));
|
||||
|
||||
|
@ -466,6 +559,7 @@ main(int argc, char **argv)
|
|||
|
||||
my_ip = inet_addr(argv[0]);
|
||||
my_mtu = mtu;
|
||||
init_users();
|
||||
|
||||
printf("Listening to dns for domain %s\n", argv[1]);
|
||||
|
||||
|
|
|
@ -19,7 +19,7 @@
|
|||
|
||||
// This is the version of the network protocol
|
||||
// It is usually equal to the latest iodine version number
|
||||
#define VERSION 0x00000305
|
||||
#define VERSION 0x00000400
|
||||
|
||||
#endif /* _VERSION_H_ */
|
||||
|
||||
|
|
Loading…
Reference in a new issue