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#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include "pwdb.h"
#include "ipdb.h"
#include "ppp.h"
#include "events.h"
#include "triton.h"
#include "log.h"
#include "memdebug.h"
static const char *conf_chap_secrets = "/etc/ppp/chap-secrets";
static in_addr_t conf_gw_ip_address = 0;
static void *pd_key;
static struct ipdb_t ipdb;
struct cs_pd_t
{
struct ppp_pd_t pd;
struct ipdb_item_t ip;
char *passwd;
};
static char *skip_word(char *ptr)
{
for(; *ptr; ptr++)
if (*ptr == ' ' || *ptr == '\t' || *ptr == '\n')
break;
return ptr;
}
static char *skip_space(char *ptr)
{
for(; *ptr; ptr++)
if (*ptr != ' ' && *ptr != '\t')
break;
return ptr;
}
static int split(char *buf, char **ptr)
{
int i;
for (i = 0; i < 3; i++) {
buf = skip_word(buf);
if (!*buf)
return i;
*buf = 0;
buf = skip_space(buf + 1);
if (!*buf)
return i;
ptr[i] = buf;
}
buf = skip_word(buf);
//if (*buf == '\n')
*buf = 0;
//else if (*buf)
// return -1;
return i;
}
static struct cs_pd_t *create_pd(struct ppp_t *ppp, const char *username)
{
FILE *f;
char *buf;
char *ptr[4];
int n;
struct cs_pd_t *pd;
if (!conf_chap_secrets)
return NULL;
f = fopen(conf_chap_secrets, "r");
if (!f) {
log_error("chap-secrets: open '%s': %s\n", conf_chap_secrets, strerror(errno));
return NULL;
}
buf = _malloc(4096);
if (!buf) {
log_emerg("chap-secrets: out of memory\n");
fclose(f);
return NULL;
}
while (fgets(buf, 4096, f)) {
n = split(buf, ptr);
if (n < 3)
continue;
if (!strcmp(buf, username))
goto found;
}
out:
fclose(f);
_free(buf);
return NULL;
found:
pd = _malloc(sizeof(*pd));
if (!pd) {
log_emerg("chap-secrets: out of memory\n");
goto out;
}
memset(pd, 0, sizeof(*pd));
pd->pd.key = &pd_key;
pd->passwd = _strdup(ptr[1]);
if (!pd->passwd) {
log_emerg("chap-secrets: out of memory\n");
_free(pd);
goto out;
}
pd->ip.addr = conf_gw_ip_address;
if (n == 3)
pd->ip.peer_addr = inet_addr(ptr[2]);
pd->ip.owner = &ipdb;
list_add_tail(&pd->pd.entry, &ppp->pd_list);
fclose(f);
_free(buf);
return pd;
}
static struct cs_pd_t *find_pd(struct ppp_t *ppp)
{
struct ppp_pd_t *pd;
list_for_each_entry(pd, &ppp->pd_list, entry) {
if (pd->key == &pd_key) {
return container_of(pd, typeof(struct cs_pd_t), pd);
}
}
return NULL;
}
static void ev_ppp_finished(struct ppp_t *ppp)
{
struct cs_pd_t *pd = find_pd(ppp);
if (!pd)
return;
list_del(&pd->pd.entry);
_free(pd->passwd);
_free(pd);
}
static struct ipdb_item_t *get_ip(struct ppp_t *ppp)
{
struct cs_pd_t *pd;
if (!conf_gw_ip_address)
return NULL;
pd = find_pd(ppp);
if (!pd)
return NULL;
if (!pd->ip.addr)
return NULL;
return &pd->ip;
}
static char* get_passwd(struct pwdb_t *pwdb, struct ppp_t *ppp, const char *username)
{
struct cs_pd_t *pd = find_pd(ppp);
if (!pd)
pd = create_pd(ppp, username);
if (!pd)
return NULL;
return _strdup(pd->passwd);
}
static struct ipdb_t ipdb = {
.get = get_ip,
};
static struct pwdb_t pwdb = {
.get_passwd = get_passwd,
};
static void __init init(void)
{
const char *opt;
opt = conf_get_opt("chap-secrets", "chap-secrets");
if (opt)
conf_chap_secrets = opt;
opt = conf_get_opt("chap-secrets", "gw-ip-address");
if (opt)
conf_gw_ip_address = inet_addr(opt);
pwdb_register(&pwdb);
ipdb_register(&ipdb);
triton_event_register_handler(EV_PPP_FINISHED, (triton_event_func)ev_ppp_finished);
}
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