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#include <sys/mman.h>
#include <sys/stat.h>
#include <unistd.h>
#include <malloc.h>
#include <sched.h>
#include <fcntl.h>
#include "authdb.h"
#include "addr.h"
#include "blob.h"
#define AUTHDB_IP_PER_ME 256
#define AUTHDB_LOGOFF_PERIOD (15*60) /* 15 mins */
static struct authdb_map_entry *authdb_me_open(sockaddr_any *addr, int create)
{
int oflag, fd;
char name[64];
blob_t b = BLOB_BUF(name);
void *base;
struct authdb_map_entry *me;
blob_push(&b, BLOB_STR("squark-auth-"));
blob_push_hexdump(&b, addr_get_hostaddr_blob(addr));
blob_push_byte(&b, 0);
oflag = O_RDWR;
if (create)
oflag |= O_CREAT;
fd = shm_open(name, oflag, 0600);
if (fd < 0)
return NULL;
if (create &&
ftruncate(fd, sizeof(struct authdb_entry[AUTHDB_IP_PER_ME])) < 0) {
close(fd);
return NULL;
}
base = mmap(NULL, sizeof(struct authdb_entry[AUTHDB_IP_PER_ME]),
PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
close(fd);
if (base == MAP_FAILED)
return NULL;
me = malloc(sizeof(*me));
if (me == NULL) {
munmap(base, sizeof(struct authdb_entry[AUTHDB_IP_PER_ME]));
return NULL;
}
me->next = NULL;
me->baseaddr = *addr;
me->entries = base;
return me;
}
static void authdb_me_free(struct authdb_map_entry *me)
{
munmap(me->entries, sizeof(struct authdb_entry[AUTHDB_IP_PER_ME]));
free(me);
}
int authdb_open(struct authdb *adb)
{
memset(adb, 0, sizeof(*adb));
return 0;
}
void authdb_close(struct authdb *adb)
{
struct authdb_map_entry *c, *n;
int i;
for (i = 0; i < ARRAY_SIZE(adb->hash_bucket); i++) {
for (c = adb->hash_bucket[i]; c != NULL; c = n) {
n = c->next;
authdb_me_free(n);
}
}
}
static unsigned int MurmurHash2(const void * key, int len, unsigned int seed)
{
// 'm' and 'r' are mixing constants generated offline.
// They're not really 'magic', they just happen to work well.
const unsigned int m = 0x5bd1e995;
const int r = 24;
unsigned int h = seed ^ len;
const unsigned char * data = (const unsigned char *)key;
while(len >= 4)
{
unsigned int k = *(unsigned int *)data;
k *= m;
k ^= k >> r;
k *= m;
h *= m;
h ^= k;
data += 4;
len -= 4;
}
switch(len)
{
case 3: h ^= data[2] << 16;
case 2: h ^= data[1] << 8;
case 1: h ^= data[0];
h *= m;
}
h ^= h >> 13;
h *= m;
h ^= h >> 15;
return h;
}
static uint32_t authdb_entry_checksum(struct authdb_entry *entry)
{
return MurmurHash2(&entry->p, sizeof(entry->p), 0);
}
void *authdb_get(struct authdb *adb, sockaddr_any *addr, struct authdb_entry *entry, int create)
{
struct authdb_map_entry *me;
int hash, e, i;
sockaddr_any baseaddr;
blob_t b;
baseaddr = *addr;
b = addr_get_hostaddr_blob(&baseaddr);
if (b.len < 4)
return NULL;
e = b.ptr[0];
b.ptr[0] = 0x00;
hash = b.ptr[1] + b.ptr[2] + b.ptr[3];
for (me = adb->hash_bucket[hash]; me != NULL; me = me->next) {
if (addr_cmp(&baseaddr, &me->baseaddr) == 0)
break;
}
if (me == NULL) {
me = authdb_me_open(&baseaddr, create);
if (me == NULL)
return NULL;
me->next = adb->hash_bucket[hash];
adb->hash_bucket[hash] = me;
}
for (i = 0; i < 3; i++) {
memcpy(&me->entries[e], entry, sizeof(struct authdb_entry));
if (entry->u.checksum == 0 && entry->u.login_time == 0)
return &me->entries[e];
if (entry->u.checksum == authdb_entry_checksum(entry))
return &me->entries[e];
sched_yield();
}
authdb_clear_entry(entry);
return &me->entries[e];
}
int authdb_set(void *token, struct authdb_entry *entry)
{
struct authdb_entry *mme = token;
uint32_t checksum = entry->u.checksum;
entry->u.checksum = authdb_entry_checksum(entry);
if (mme->u.checksum != checksum)
return 0;
mme->u.checksum = entry->u.checksum;
memcpy(mme, entry, sizeof(*entry));
return 1;
}
int authdb_check_login(void *token, struct authdb_entry *e, blob_t username, time_t now)
{
struct authdb_entry *mme = token;
/* check username */
if (!blob_is_null(username) &&
blob_cmp(username, BLOB_STRLEN(e->p.login_name)) != 0)
return 0;
/* and dates */
if (now > e->u.login_time + AUTHDB_LOGOFF_PERIOD)
return 0;
/* and that no one clobbered the entry */
if (mme->u.checksum != e->u.checksum)
return 0;
/* refresh last activity */
mme->u.login_time = now;
return 1;
}
void authdb_clear_entry(struct authdb_entry *entry)
{
memset(&entry->p, 0, sizeof(entry->p));
entry->u.login_time = 0;
entry->u.override_time = 0;
}
void authdb_commit_login(void *token, struct authdb_entry *e, time_t now)
{
/* fixme read stuff from config files */
e->u.login_time = now;
authdb_set(token, e);
}
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