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#include <stdlib.h>
#include <stdio.h>
#include <stdint.h>
#include <unistd.h>
#include <string.h>
#include <arpa/inet.h>
#include "ipdb.h"
#include "list.h"
#include "spinlock.h"
#include "memdebug.h"
struct ippool_item_t
{
struct list_head entry;
struct ipdb_item_t it;
};
struct ipaddr_t
{
struct list_head entry;
in_addr_t addr;
};
static LIST_HEAD(gw_list);
static LIST_HEAD(tunnel_list);
static LIST_HEAD(ippool);
static spinlock_t pool_lock = SPINLOCK_INITIALIZER;
static struct ipdb_t ipdb;
static in_addr_t conf_gw_ip_address;
static int cnt;
static void parse_gw_ip_address(const char *val)
{
if (!val)
return;
conf_gw_ip_address = inet_addr(val);
}
//parses ranges like x.x.x.x/mask
static int parse1(const char *str, uint32_t *begin, uint32_t *end)
{
int n, f1, f2, f3, f4, m, mask = 0;
n = sscanf(str, "%u.%u.%u.%u/%u",&f1, &f2, &f3, &f4, &m);
if (n != 5)
return -1;
if (f1 > 255)
return -1;
if (f2 > 255)
return -1;
if (f3 > 255)
return -1;
if (f4 > 255)
return -1;
if (m == 0 || m > 32)
return -1;
*begin = (f4 << 24) | (f3 << 16) | (f2 << 8) | f1;
mask = htonl(~((1 << (32 - m)) - 1));
*end = ntohl(*begin | ~mask);
*begin = ntohl(*begin);
return 0;
}
//parses ranges like x.x.x.x-y
static int parse2(const char *str, uint32_t *begin, uint32_t *end)
{
int n, f1, f2, f3, f4, m;
n = sscanf(str, "%u.%u.%u.%u-%u",&f1, &f2, &f3, &f4, &m);
if (n != 5)
return -1;
if (f1 > 255)
return -1;
if (f2 > 255)
return -1;
if (f3 > 255)
return -1;
if (f4 > 255)
return -1;
if (m < f4 || m > 255)
return -1;
*begin = ntohl((f4 << 24) | (f3 << 16) | (f2 << 8) | f1);
*end = ntohl((m << 24) | (f3 << 16) | (f2 << 8) | f1);
return 0;
}
static void add_range(struct list_head *list, const char *name)
{
uint32_t i,startip, endip;
struct ipaddr_t *ip;
if (parse1(name, &startip, &endip))
if (parse2(name, &startip, &endip)) {
fprintf(stderr, "ippool: cann't parse '%s'\n", name);
_exit(EXIT_FAILURE);
}
for (i = startip; i <= endip; i++) {
ip = malloc(sizeof(*ip));
ip->addr = htonl(i);
list_add_tail(&ip->entry, list);
cnt++;
}
}
static void generate_pool(void)
{
struct ippool_item_t *it;
struct ipaddr_t *addr = NULL;
struct ipaddr_t *peer_addr;
while (1) {
if (list_empty(&tunnel_list))
break;
else {
peer_addr = list_entry(tunnel_list.next, typeof(*peer_addr), entry);
list_del(&peer_addr->entry);
}
if (!conf_gw_ip_address) {
if (list_empty(&gw_list))
break;
else {
addr = list_entry(gw_list.next, typeof(*addr), entry);
list_del(&addr->entry);
}
}
it = malloc(sizeof(*it));
if (!it) {
fprintf(stderr, "ippool: out of memory\n");
break;
}
it->it.owner = &ipdb;
if (conf_gw_ip_address)
it->it.addr = conf_gw_ip_address;
else
it->it.addr = addr->addr;
it->it.peer_addr = peer_addr->addr;
list_add_tail(&it->entry, &ippool);
}
}
static struct ipdb_item_t *get_ip(struct ppp_t *ppp)
{
struct ippool_item_t *it;
spin_lock(&pool_lock);
if (!list_empty(&ippool)) {
it = list_entry(ippool.next, typeof(*it), entry);
list_del(&it->entry);
} else
it = NULL;
spin_unlock(&pool_lock);
return it ? &it->it : NULL;
}
static void put_ip(struct ppp_t *ppp, struct ipdb_item_t *it)
{
struct ippool_item_t *pit = container_of(it, typeof(*pit), it);
spin_lock(&pool_lock);
list_add_tail(&pit->entry, &ippool);
spin_unlock(&pool_lock);
}
static struct ipdb_t ipdb = {
.get = get_ip,
.put = put_ip,
};
static void ippool_init(void)
{
struct conf_sect_t *s = conf_get_section("ip-pool");
struct conf_option_t *opt;
if (!s)
return;
list_for_each_entry(opt, &s->items, entry) {
if (!strcmp(opt->name, "gw-ip-address"))
parse_gw_ip_address(opt->val);
else if (!strcmp(opt->name, "gw"))
add_range(&gw_list, opt->val);
else if (!strcmp(opt->name, "tunnel"))
add_range(&tunnel_list, opt->val);
else if (!opt->val)
add_range(&tunnel_list, opt->name);
}
generate_pool();
ipdb_register(&ipdb);
}
DEFINE_INIT(100, ippool_init);
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