iodine/src/user.c

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/*
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* Copyright (c) 2006-2007 Bjorn Andersson <flex@kryo.se>, Erik Ekman <yarrick@kryo.se>
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*
* 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>
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#include <stdint.h>
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#include <time.h>
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#include <stdlib.h>
#include <string.h>
#include <signal.h>
#include <unistd.h>
#include <netdb.h>
#include <netinet/in.h>
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#include <sys/types.h>
#include <sys/socket.h>
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#include <fcntl.h>
#include <err.h>
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#include <arpa/inet.h>
#include "common.h"
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#include "encoding.h"
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#include "user.h"
struct user users[USERS];
void
init_users(in_addr_t my_ip)
{
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;
}
}
int
users_waiting_on_reply()
{
int ret;
int i;
ret = 0;
for (i = 0; i < USERS; i++) {
if (users[i].active && users[i].last_pkt + 60 > time(NULL) &&
users[i].q.id != 0) {
ret++;
}
}
return ret;
}
int
find_user_by_ip(uint32_t ip)
{
int ret;
int i;
ret = -1;
for (i = 0; i < USERS; i++) {
if (users[i].active && users[i].last_pkt + 60 > time(NULL) &&
ip == users[i].tun_ip) {
ret = i;
break;
}
}
return ret;
}
int
all_users_waiting_to_send()
{
time_t now;
int ret;
int i;
ret = 1;
now = time(NULL);
for (i = 0; i < USERS; i++) {
if (users[i].active && users[i].last_pkt + 60 > now &&
users[i].outpacket.len == 0) {
ret = 0;
break;
}
}
return ret;
}
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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;
}