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rlm_memcache.c
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rlm_memcache.c
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#include <freeradius/radiusd.h>
#include <freeradius/modules.h>
#include <freeradius/rad_assert.h>
#include <libmemcached/memcached.h>
/* maximum size of stored values */
#define BUFFERLEN 4096
/* maximum length of memcached key */
#define KEYLEN 32
typedef struct rlm_memcache_t {
char *key;
char *servers;
memcached_st *memc;
} rlm_memcache_t;
static const CONF_PARSER module_config[] = {
{ "key", PW_TYPE_STRING_PTR, offsetof(rlm_memcache_t, key), NULL, "Framed-IP-Address" },
{ "servers", PW_TYPE_STRING_PTR, offsetof(rlm_memcache_t, servers), NULL, "localhost" },
{ NULL, -1, 0, NULL, NULL }
};
static int memcache_instantiate(CONF_SECTION *conf, void **instance)
{
rlm_memcache_t *inst;
char *p, *last = NULL, *server;
unsigned int port;
memcached_return rc;
memcached_server_st *server_list = NULL;
inst = rad_malloc(sizeof(*inst));
bzero(inst, sizeof(*inst));
if ( cf_section_parse(conf, inst, module_config) < 0 ) {
radlog(L_ERR, "rlm_memcache: Cannot parse config");
free(inst);
return -1;
}
if ( ! inst->servers ) {
radlog(L_ERR, "rlm_memcache: 'servers' not specified");
free(inst);
return -1;
}
DEBUG("Key for memcached: %s", inst->key);
inst->memc = memcached_create(NULL);
for ( server = strtok_r(inst->servers, " ", &last); server; server = strtok_r(NULL, " ", &last) ) {
if ( (p = strchr(server, ':' )) ) {
*p = 0;
p++;
port = atoi(p);
} else {
port = MEMCACHED_DEFAULT_PORT;
}
DEBUG("Adding memcached server: %s:%u", server, port);
server_list = memcached_server_list_append(server_list, server, port, &rc);
if ( rc != MEMCACHED_SUCCESS) {
radlog(L_ERR, "libmemcached: %s", memcached_strerror(inst->memc, rc));
return -1;
}
}
rc = memcached_server_push(inst->memc, server_list);
memcached_server_list_free(server_list);
if ( rc != MEMCACHED_SUCCESS) {
radlog(L_ERR, "libmemcached: %s", memcached_strerror(inst->memc, rc));
return -1;
}
*instance = inst;
return 0;
}
static int memcache_detach(void *instance)
{
rlm_memcache_t *p = instance;
memcached_free(p->memc);
free(p->servers);
free(p->key);
free(p);
return 0;
}
static int memcache_account(void *instance, REQUEST *request)
{
rlm_memcache_t *p = instance;
char *vptr;
const char *attr;
int len, count = 0, left = 0, remove = 0;
char val[BUFFERLEN], key[KEYLEN], out[255];
memcached_return rc;
rad_assert(request->packet != NULL);
vptr = val;
*vptr++ = '{';
VALUE_PAIR *first = request->packet->vps;
key[0] = 0;
/* go over linked list of attribute value-pairs */
while (first) {
attr = first->name;
if ( !key[0] && !strcmp(attr, p->key) ) {
vp_prints_value(key, sizeof(key), first, 0);
if (remove) {
break;
}
}
else if ( first->attribute == PW_ACCT_STATUS_TYPE ) {
if ( first->lvalue == PW_STATUS_STOP ) {
remove = 1;
/* only if the key is alrady known */
if (key[0]) {
break;
}
}
}
/* if we need to remove key, no need to process attrs */
else if ( remove ) {
continue;
}
/* it's not a key, add to JSON hash */
else {
/* check that we have enough space */
left = BUFFERLEN - (vptr-val);
if ( left <= 0 ) {
left = 0;
break;
}
if ( count ) {
*vptr++ = ',';
left--;
}
len = vp_prints_value(out, sizeof(out), first, 0);
snprintf(vptr, left, "\"%s\":\"%s\"", attr, out);
vptr += len + strlen(attr) + 5; /* 4 * " + 1 * : */
count++;
}
first = first->next;
}
if ( remove ) {
RDEBUG("removing '%s'", key);
rc = memcached_delete(p->memc, key, strlen(key), (time_t)0);
} else {
left = BUFFERLEN - (vptr-val);
if ( left > 1) {
*vptr++ = '}';
*vptr = 0;
} else {
val[BUFFERLEN-1] = 0;
}
RDEBUG("setting '%s' => '%s'", key, val);
rc = memcached_set(p->memc, key, strlen(key), val, strlen(val), (time_t)0, (uint32_t)0);
}
if ( rc != MEMCACHED_SUCCESS) {
radlog_request(L_ERR, 0, request, "libmemcached: %s", memcached_strerror(p->memc, rc));
return RLM_MODULE_FAIL;
}
return RLM_MODULE_OK;
}
module_t rlm_memcache = {
RLM_MODULE_INIT,
"memcache",
RLM_TYPE_THREAD_SAFE, /* type */
memcache_instantiate, /* instantiation */
memcache_detach, /* detach */
{
NULL, /* authentication */
NULL, /* authorization */
memcache_account, /* preaccounting */
memcache_account, /* accounting */
NULL, /* checksimul */
NULL, /* pre-proxy */
NULL, /* post-proxy */
NULL /* post-auth */
},
};