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/*
* NetCosm - a MUD server
* Copyright (C) 2016 Franklin Wei
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "globals.h"
#include "client.h"
#include "hash.h"
#include "server.h"
#include "userdb.h"
static void *map = NULL;
static char *db_file = NULL;
/*
* the user DB is stored on disk as an ASCII database
*
* this is then loaded into fixed-sized hash map at init
* TODO: implement with B-tree
*/
void userdb_init(const char *file)
{
db_file = strdup(file);
/* FILE* for getline() */
FILE *f = fopen(file, "r");
map = hash_init(256, hash_djb, compare_strings);
hash_setfreedata_cb(map, free);
char *format;
asprintf(&format, "%%%d[a-z0-9 ]:%%%d[A-Z]:%%%ds:%%d:%%ld\n",
MAX_NAME_LEN, SALT_LEN, AUTH_HASHLEN * 2);
if(f)
{
while(1)
{
struct userdata_t *data = calloc(1, sizeof(*data));
int ret = fscanf(f, format,
data->username,
data->salt,
data->passhash,
&data->priv,
&data->last_login);
if(ret != 5)
{
free(data);
break;
}
hash_insert(map, data->username, data);
}
fclose(f);
}
free(format);
}
void userdb_write(const char *file)
{
int fd = open(file, O_WRONLY | O_CREAT | O_TRUNC, 0600);
void *save, *ptr = map;
while(1)
{
struct userdata_t *user = hash_iterate(ptr, &save, NULL);
ptr = NULL;
if(!user)
break;
dprintf(fd, "%s:%*s:%*s:%d:%ld\n",
user->username,
SALT_LEN, user->salt,
AUTH_HASHLEN*2, user->passhash,
user->priv,
user->last_login);
}
close(fd);
}
struct userdata_t *userdb_lookup(const char *key)
{
return hash_lookup(map, key);
}
bool userdb_remove(const char *key)
{
if(hash_remove(map, key))
{
userdb_write(db_file);
return true;
}
return false;
}
/* should never fail, but could return NULL if something really weird
* happens */
struct userdata_t *userdb_add(struct userdata_t *data)
{
struct userdata_t *new = calloc(1, sizeof(*new)); /* only in C! */
memcpy(new, data, sizeof(*new));
struct userdata_t *ret;
if((ret = hash_insert(map, new->username, new))) /* already exists */
{
hash_remove(map, new->username);
ret = hash_insert(map, new->username, new);
}
userdb_write(db_file);
return ret;
}
void userdb_shutdown(void)
{
if(map && db_file)
userdb_write(db_file);
if(map)
{
hash_free(map);
map = NULL;
}
if(db_file)
{
free(db_file);
db_file = NULL;
}
}
size_t userdb_size(void)
{
return hash_size(map);
}
/* child request wrappers */
/* NOTE: also works from the master, but it's better to use the userdb_* funcs instead */
struct userdata_t *userdb_request_lookup(const char *name)
{
if(are_child)
{
send_master(REQ_GETUSERDATA, name, strlen(name) + 1);
debugf("returned reqdata is of type %d\n", reqdata_type);
if(reqdata_type == TYPE_USERDATA)
return &returned_reqdata.userdata;
return NULL;
}
else
return userdb_lookup(name);
}
bool userdb_request_add(struct userdata_t *data)
{
if(are_child)
{
send_master(REQ_ADDUSERDATA, data, sizeof(*data));
return returned_reqdata.boolean;
}
else
return userdb_add(data);
}
bool userdb_request_remove(const char *name)
{
if(are_child)
{
send_master(REQ_DELUSERDATA, name, strlen(name) + 1);
return returned_reqdata.boolean;
}
else
return userdb_remove(name);
}
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