267 lines
5.7 KiB
C
267 lines
5.7 KiB
C
/*
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* Copyright (C) 2008 Martin Willi
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* HSR Hochschule fuer Technik Rapperswil
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*/
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#include "eap_sim_file_triplets.h"
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#include <stdio.h>
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#include <errno.h>
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#include <daemon.h>
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#include <collections/linked_list.h>
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#include <threading/mutex.h>
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#include <simaka_manager.h>
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typedef struct private_eap_sim_file_triplets_t private_eap_sim_file_triplets_t;
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/**
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* Private data of an eap_sim_file_triplets_t object.
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*/
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struct private_eap_sim_file_triplets_t {
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/**
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* Public eap_sim_file_triplets_t interface.
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*/
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eap_sim_file_triplets_t public;
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/**
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* List of triplets, as triplet_t
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*/
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linked_list_t *triplets;
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/**
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* mutex to lock triplets list
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*/
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mutex_t *mutex;
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};
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/**
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* A single triplet
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*/
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typedef struct {
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identification_t *imsi;
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char rand[SIM_RAND_LEN];
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char sres[SIM_SRES_LEN];
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char kc[SIM_KC_LEN];
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} triplet_t;
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/**
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* Destroy a triplet
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*/
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static void triplet_destroy(triplet_t *this)
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{
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DESTROY_IF(this->imsi);
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free(this);
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}
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/**
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* triplet enumerator
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*/
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typedef struct {
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/** implements enumerator */
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enumerator_t public;
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/** inner enumerator */
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enumerator_t *inner;
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/** current enumerating triplet */
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triplet_t *current;
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/** back ptr */
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private_eap_sim_file_triplets_t *this;
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} triplet_enumerator_t;
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METHOD(enumerator_t, enumerator_destroy, void,
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triplet_enumerator_t *e)
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{
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if (e->current)
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{
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/* We assume that the current element is used on invocation if destroy.
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* We move that triplet to the end to avoid handout of the same triplet
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* next time. */
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e->this->triplets->remove_at(e->this->triplets, e->inner);
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e->this->triplets->insert_last(e->this->triplets, e->current);
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}
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e->inner->destroy(e->inner);
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e->this->mutex->unlock(e->this->mutex);
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free(e);
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}
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METHOD(enumerator_t, enumerator_enumerate, bool,
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triplet_enumerator_t *e, va_list args)
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{
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identification_t **imsi;
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triplet_t *triplet;
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char **rand, **sres, **kc;
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VA_ARGS_VGET(args, imsi, rand, sres, kc);
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if (e->inner->enumerate(e->inner, &triplet))
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{
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e->current = triplet;
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*imsi = triplet->imsi;
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*rand = triplet->rand;
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*sres = triplet->sres;
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*kc = triplet->kc;
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return TRUE;
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}
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e->current = NULL;
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return FALSE;
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}
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METHOD(eap_sim_file_triplets_t, create_enumerator, enumerator_t*,
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private_eap_sim_file_triplets_t *this)
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{
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triplet_enumerator_t *enumerator;
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this->mutex->lock(this->mutex);
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INIT(enumerator,
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.public = {
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.enumerate = enumerator_enumerate_default,
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.venumerate = _enumerator_enumerate,
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.destroy = _enumerator_destroy,
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},
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.inner = this->triplets->create_enumerator(this->triplets),
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.this = this,
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);
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return &enumerator->public;
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}
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/**
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* convert to token into the array
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*/
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static void parse_token(char *to, char *from, size_t len)
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{
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chunk_t chunk;
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chunk = chunk_create(from, min(strlen(from), len * 2));
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chunk = chunk_from_hex(chunk, NULL);
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memset(to, 0, len);
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memcpy(to + len - chunk.len, chunk.ptr, chunk.len);
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free(chunk.ptr);
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}
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/**
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* Read the triplets from the file
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*/
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static bool read_triplets(private_eap_sim_file_triplets_t *this, char *path)
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{
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char line[512];
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FILE *file;
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int i, nr = 0;
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file = fopen(path, "r");
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if (file == NULL)
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{
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DBG1(DBG_CFG, "opening triplet file %s failed: %s",
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path, strerror(errno));
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return FALSE;
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}
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/* read line by line */
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while (fgets(line, sizeof(line), file))
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{
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triplet_t *triplet;
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enumerator_t *enumerator;
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char *token;
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nr++;
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/* skip comments, empty lines */
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switch (line[0])
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{
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case '\n':
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case '\r':
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case '#':
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case '\0':
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continue;
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default:
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break;
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}
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triplet = malloc_thing(triplet_t);
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memset(triplet, 0, sizeof(triplet_t));
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i = 0;
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enumerator = enumerator_create_token(line, ",", " \n\r#");
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while (enumerator->enumerate(enumerator, &token))
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{
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switch (i++)
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{
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case 0: /* IMSI */
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triplet->imsi = identification_create_from_string(token);
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continue;
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case 1: /* rand */
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parse_token(triplet->rand, token, SIM_RAND_LEN);
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continue;
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case 2: /* sres */
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parse_token(triplet->sres, token, SIM_SRES_LEN);
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continue;
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case 3: /* kc */
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parse_token(triplet->kc, token, SIM_KC_LEN);
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continue;
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default:
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break;;
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}
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break;
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}
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enumerator->destroy(enumerator);
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if (i < 4)
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{
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DBG1(DBG_CFG, "error in triplet file, line %d", nr);
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triplet_destroy(triplet);
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continue;
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}
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DBG2(DBG_CFG, "triplet: imsi %Y\nrand %b\nsres %b\nkc %b",
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triplet->imsi, triplet->rand, SIM_RAND_LEN,
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triplet->sres, SIM_SRES_LEN, triplet->kc, SIM_KC_LEN);
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this->triplets->insert_last(this->triplets, triplet);
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}
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fclose(file);
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DBG1(DBG_CFG, "read %d triplets from %s",
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this->triplets->get_count(this->triplets), path);
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return TRUE;
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}
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METHOD(eap_sim_file_triplets_t, destroy, void,
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private_eap_sim_file_triplets_t *this)
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{
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this->triplets->destroy_function(this->triplets, (void*)triplet_destroy);
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this->mutex->destroy(this->mutex);
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free(this);
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}
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/**
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* See header
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*/
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eap_sim_file_triplets_t *eap_sim_file_triplets_create(char *file)
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{
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private_eap_sim_file_triplets_t *this;
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INIT(this,
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.public = {
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.create_enumerator = _create_enumerator,
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.destroy = _destroy,
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},
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.triplets = linked_list_create(),
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.mutex = mutex_create(MUTEX_TYPE_DEFAULT),
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);
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if (!read_triplets(this, file))
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{
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destroy(this);
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return NULL;
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}
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return &this->public;
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}
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