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/*
* This program is 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 2 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, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*/
/**
* $Id$
* @file serialize.c
* @brief Serialize and deserialise cache entries.
*
* @author Arran Cudbard-Bell
* @copyright 2014 Arran Cudbard-Bell <a.cudbardb@freeradius.org>
* @copyright 2014 The FreeRADIUS server project
*/
RCSID("$Id$")
#include "rlm_cache.h"
#include "serialize.h"
/** Serialize a cache entry as a humanly readable string
*
* @param ctx to alloc new string in. Should be a talloc pool a little bigger
* than the maximum serialized size of the entry.
* @param out Where to write pointer to serialized cache entry.
* @param c Cache entry to serialize.
* @return 0 on success else -1.
*/
int cache_serialize(TALLOC_CTX *ctx, char **out, rlm_cache_entry_t *c)
{
TALLOC_CTX *pairs = NULL;
vp_cursor_t cursor;
VALUE_PAIR *vp;
char *to_store = NULL, *pair;
to_store = talloc_asprintf(ctx, "&Cache-Expires = %" PRIu64 "\n&Cache-Created = %" PRIu64 "\n",
(uint64_t)c->expires, (uint64_t)c->created);
if (!to_store) goto error;
/*
* It's valid to have an empty cache entry (save allocing the
* pairs pool)
*/
if (!c->control && !c->packet && !c->reply) goto finish;
/*
* In the majority of cases using these pools reduces the number of mallocs
* to two, except in the case where the total serialized pairs length is
* greater than the pairs pool, or the total serialized string is greater
* than the store pool.
*/
pairs = talloc_pool(ctx, 512);
if (!pairs) {
error:
talloc_free(pairs);
return -1;
}
if (c->control) {
for (vp = fr_cursor_init(&cursor, &c->control);
vp;
vp = fr_cursor_next(&cursor)) {
pair = vp_aprints(pairs, vp, '\'');
if (!pair) goto error;
to_store = talloc_asprintf_append_buffer(to_store, "&control:%s\n", pair);
if (!to_store) goto error;
}
}
if (c->packet) {
for (vp = fr_cursor_init(&cursor, &c->packet);
vp;
vp = fr_cursor_next(&cursor)) {
pair = vp_aprints(pairs, vp, '\'');
if (!pair) goto error;
to_store = talloc_asprintf_append_buffer(to_store, "&%s\n", pair);
if (!to_store) goto error;
}
}
if (c->reply) {
for (vp = fr_cursor_init(&cursor, &c->reply);
vp;
vp = fr_cursor_next(&cursor)) {
pair = vp_aprints(pairs, vp, '\'');
if (!pair) goto error;
to_store = talloc_asprintf_append_buffer(to_store, "&reply:%s\n", pair);
if (!to_store) goto error;
}
}
if (c->state) {
for (vp = fr_cursor_init(&cursor, &c->state);
vp;
vp = fr_cursor_next(&cursor)) {
pair = vp_aprints(pairs, vp, '\'');
if (!pair) goto error;
to_store = talloc_asprintf_append_buffer(to_store, "&session-state:%s\n", pair);
if (!to_store) goto error;
}
}
finish:
talloc_free(pairs);
*out = to_store;
return 0;
}
/** Converts a serialized cache entry back into a structure
*
* @param c Cache entry to populate (should already be allocated)
* @param in String representation of cache entry.
* @param inlen Length of string. May be < 0 in which case strlen will be
* used to calculate the length of the string.
* @return 0 on success, -1 on error.
*/
int cache_deserialize(rlm_cache_entry_t *c, char *in, ssize_t inlen)
{
vp_cursor_t packet, control, reply, state;
TALLOC_CTX *store = NULL;
char *p, *q;
store = talloc_pool(c, 1024);
if (!store) return -1;
if (inlen < 0) inlen = strlen(in);
fr_cursor_init(&packet, &c->packet);
fr_cursor_init(&control, &c->control);
fr_cursor_init(&reply, &c->reply);
fr_cursor_init(&state, &c->state);
p = in;
while (((size_t)(p - in)) < (size_t)inlen) {
vp_map_t *map = NULL;
VALUE_PAIR *vp = NULL;
ssize_t len;
q = strchr(p, '\n');
if (!q) break; /* List should also be terminated with a \n */
*q = '\0';
if (map_afrom_attr_str(store, &map, p,
REQUEST_CURRENT, PAIR_LIST_REQUEST,
REQUEST_CURRENT, PAIR_LIST_REQUEST) < 0) {
fr_strerror_printf("Failed parsing pair: %s", p);
goto error;
}
if (map->lhs->type != TMPL_TYPE_ATTR) {
fr_strerror_printf("Pair left hand side \"%s\" parsed as %s, needed attribute. "
"Check local dictionaries", map->lhs->name,
fr_int2str(tmpl_names, map->lhs->type, "<INVALID>"));
goto error;
}
if (map->rhs->type != TMPL_TYPE_LITERAL) {
fr_strerror_printf("Pair right hand side \"%s\" parsed as %s, needed literal. "
"Check serialized data quoting", map->rhs->name,
fr_int2str(tmpl_names, map->rhs->type, "<INVALID>"));
goto error;
}
/*
* Convert literal to a type appropriate for the VP.
*/
if (tmpl_cast_in_place(map->rhs, map->lhs->tmpl_da->type, map->lhs->tmpl_da) < 0) goto error;
vp = fr_pair_afrom_da(c, map->lhs->tmpl_da);
len = value_data_copy(vp, &vp->data, map->rhs->tmpl_data_type,
&map->rhs->tmpl_data_value, map->rhs->tmpl_data_length);
if (len < 0) goto error;
vp->vp_length = len;
/*
* Pull out the special attributes, and set the
* relevant cache entry fields.
*/
if (vp->da->vendor == 0) switch (vp->da->attr) {
case PW_CACHE_CREATED:
c->created = vp->vp_date;
talloc_free(vp);
goto next;
case PW_CACHE_EXPIRES:
c->expires = vp->vp_date;
talloc_free(vp);
goto next;
default:
break;
}
switch (map->lhs->tmpl_list) {
case PAIR_LIST_REQUEST:
fr_cursor_insert(&packet, vp);
break;
case PAIR_LIST_CONTROL:
fr_cursor_insert(&control, vp);
break;
case PAIR_LIST_REPLY:
fr_cursor_insert(&reply, vp);
break;
case PAIR_LIST_STATE:
fr_cursor_insert(&state, vp);
break;
default:
fr_strerror_printf("Invalid cache list for pair: %s", p);
error:
talloc_free(vp);
talloc_free(map);
return -1;
}
next:
p = q + 1;
talloc_free(map);
}
return 0;
}
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