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/*
* Copyright (c) 2006-2014 Erik Ekman <yarrick@kryo.se>,
* 2006-2009 Bjorn Andersson <flex@kryo.se>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <stdio.h>
#include <stdint.h>
#include <time.h>
#include <stdlib.h>
#include <string.h>
#include <signal.h>
#include <unistd.h>
#include <fcntl.h>
#ifdef WINDOWS32
#include <winsock2.h>
#else
#include <netdb.h>
#endif
#include "common.h"
#include "encoding.h"
#include "user.h"
struct tun_user *users;
unsigned usercount;
int
init_users(in_addr_t my_ip, int netbits)
{
int i;
int skip = 0;
char newip[16];
int maxusers;
in_addr_t netmask = 0;
struct in_addr net;
struct in_addr ipstart;
for (i = 0; i < netbits; i++) {
netmask = (netmask << 1) | 1;
}
netmask <<= (32 - netbits);
net.s_addr = htonl(netmask);
ipstart.s_addr = my_ip & net.s_addr;
maxusers = (1 << (32-netbits)) - 3; /* 3: Net addr, broadcast addr, iodined addr */
usercount = MIN(maxusers, USERS);
users = calloc(usercount, sizeof(struct tun_user));
for (i = 0; i < usercount; i++) {
in_addr_t ip;
users[i].id = i;
snprintf(newip, sizeof(newip), "0.0.0.%d", i + skip + 1);
ip = ipstart.s_addr + inet_addr(newip);
if (ip == my_ip && skip == 0) {
/* This IP was taken by iodined */
skip++;
snprintf(newip, sizeof(newip), "0.0.0.%d", i + skip + 1);
ip = ipstart.s_addr + inet_addr(newip);
}
users[i].tun_ip = ip;
net.s_addr = ip;
users[i].disabled = 0;
users[i].authenticated = 0;
users[i].authenticated_raw = 0;
users[i].active = 0;
/* Rest is reset on login ('V' packet) */
}
return usercount;
}
const char*
users_get_first_ip()
{
struct in_addr ip;
ip.s_addr = users[0].tun_ip;
return strdup(inet_ntoa(ip));
}
int
users_waiting_on_reply()
{
int ret;
int i;
ret = 0;
for (i = 0; i < usercount; i++) {
if (users[i].active && !users[i].disabled &&
users[i].last_pkt + 60 > time(NULL) &&
users[i].q.id != 0 && users[i].conn == CONN_DNS_NULL) {
ret++;
}
}
return ret;
}
int
find_user_by_ip(uint32_t ip)
{
int ret;
int i;
ret = -1;
for (i = 0; i < usercount; i++) {
if (users[i].active &&
users[i].authenticated &&
!users[i].disabled &&
users[i].last_pkt + 60 > time(NULL) &&
ip == users[i].tun_ip) {
ret = i;
break;
}
}
return ret;
}
int
all_users_waiting_to_send()
/* If this returns true, then reading from tun device is blocked.
So only return true when all clients have at least one packet in
the outpacket-queue, so that sending back-to-back is possible
without going through another select loop.
*/
{
time_t now;
int ret;
int i;
ret = 1;
now = time(NULL);
for (i = 0; i < usercount; i++) {
if (users[i].active && !users[i].disabled &&
users[i].last_pkt + 60 > now &&
((users[i].conn == CONN_RAW_UDP) ||
((users[i].conn == CONN_DNS_NULL)
#ifdef OUTPACKETQ_LEN
&& users[i].outpacketq_filled < 1
#else
&& users[i].outpacket.len == 0
#endif
))) {
ret = 0;
break;
}
}
return ret;
}
int
find_available_user()
{
int ret = -1;
int i;
for (i = 0; i < usercount; i++) {
/* Not used at all or not used in one minute */
if ((!users[i].active || users[i].last_pkt + 60 < time(NULL)) && !users[i].disabled) {
users[i].active = 1;
users[i].authenticated = 0;
users[i].authenticated_raw = 0;
users[i].last_pkt = time(NULL);
users[i].fragsize = 4096;
users[i].conn = CONN_DNS_NULL;
ret = i;
break;
}
}
return ret;
}
void
user_switch_codec(int userid, struct encoder *enc)
{
if (userid < 0 || userid >= usercount)
return;
users[userid].encoder = enc;
}
void
user_set_conn_type(int userid, enum connection c)
{
if (userid < 0 || userid >= usercount)
return;
if (c < 0 || c >= CONN_MAX)
return;
users[userid].conn = c;
}
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