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#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <arpa/inet.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include "linux_ppp.h"
#include "ppp.h"
#include "ppp_ipcp.h"
#include "ppp_ccp.h"
#include "log.h"
#include "ipdb.h"
#include "iprange.h"
#include "events.h"
#include "memdebug.h"
static int conf_check_exists;
static struct ipcp_option_t *ipaddr_init(struct ppp_ipcp_t *ipcp);
static void ipaddr_free(struct ppp_ipcp_t *ipcp, struct ipcp_option_t *opt);
static int ipaddr_send_conf_req(struct ppp_ipcp_t *ipcp, struct ipcp_option_t *opt, uint8_t *ptr);
static int ipaddr_send_conf_nak(struct ppp_ipcp_t *ipcp, struct ipcp_option_t *opt, uint8_t *ptr);
static int ipaddr_recv_conf_req(struct ppp_ipcp_t *ipcp, struct ipcp_option_t *opt, uint8_t *ptr);
//static int ipaddr_recv_conf_ack(struct ppp_ipcp_t *ipcp, struct ipcp_option_t *opt, uint8_t *ptr);
static void ipaddr_print(void (*print)(const char *fmt,...),struct ipcp_option_t*, uint8_t *ptr);
struct ipaddr_option_t
{
struct ipcp_option_t opt;
struct ppp_t *ppp;
int started:1;
};
static struct ipcp_option_handler_t ipaddr_opt_hnd = {
.init = ipaddr_init,
.send_conf_req = ipaddr_send_conf_req,
.send_conf_nak = ipaddr_send_conf_nak,
.recv_conf_req = ipaddr_recv_conf_req,
.free = ipaddr_free,
.print = ipaddr_print,
};
static struct ipcp_option_t *ipaddr_init(struct ppp_ipcp_t *ipcp)
{
struct ipaddr_option_t *ipaddr_opt = _malloc(sizeof(*ipaddr_opt));
memset(ipaddr_opt, 0, sizeof(*ipaddr_opt));
ipaddr_opt->opt.id = CI_ADDR;
ipaddr_opt->opt.len = 6;
ipaddr_opt->ppp = ipcp->ppp;
return &ipaddr_opt->opt;
}
static void ipaddr_free(struct ppp_ipcp_t *ipcp, struct ipcp_option_t *opt)
{
struct ipaddr_option_t *ipaddr_opt = container_of(opt, typeof(*ipaddr_opt), opt);
if (ipcp->ppp->ipv4)
ipdb_put_ipv4(ipcp->ppp, ipcp->ppp->ipv4);
_free(ipaddr_opt);
}
static int check_exists(struct ppp_t *self_ppp, in_addr_t addr)
{
struct ppp_t *ppp;
int r = 0;
pthread_rwlock_rdlock(&ppp_lock);
list_for_each_entry(ppp, &ppp_list, entry) {
if (!ppp->terminating && ppp->ipv4 && ppp->ipv4->peer_addr == addr && ppp != self_ppp) {
log_ppp_warn("ppp: requested IPv4 address already assigned to %s\n", ppp->ifname);
r = 1;
break;
}
}
pthread_rwlock_unlock(&ppp_lock);
return r;
}
static int alloc_ip(struct ppp_t *ppp)
{
ppp->ipv4 = ipdb_get_ipv4(ppp);
if (!ppp->ipv4) {
log_ppp_warn("ppp: no free IPv4 address\n");
return IPCP_OPT_CLOSE;
}
if (iprange_tunnel_check(ppp->ipv4->peer_addr)) {
log_ppp_warn("ppp:ipcp: to avoid kernel soft lockup requested IP cannot be assigned (%i.%i.%i.%i)\n",
ppp->ipv4->peer_addr&0xff,
(ppp->ipv4->peer_addr >> 8)&0xff,
(ppp->ipv4->peer_addr >> 16)&0xff,
(ppp->ipv4->peer_addr >> 24)&0xff);
return IPCP_OPT_FAIL;
}
if (conf_check_exists && check_exists(ppp, ppp->ipv4->peer_addr))
return IPCP_OPT_FAIL;
return 0;
}
static int ipaddr_send_conf_req(struct ppp_ipcp_t *ipcp, struct ipcp_option_t *opt, uint8_t *ptr)
{
struct ipaddr_option_t *ipaddr_opt = container_of(opt, typeof(*ipaddr_opt), opt);
struct ipcp_opt32_t *opt32 = (struct ipcp_opt32_t *)ptr;
int r;
if (!ipcp->ppp->ipv4) {
r = alloc_ip(ipcp->ppp);
if (r)
return r;
}
opt32->hdr.id = CI_ADDR;
opt32->hdr.len = 6;
opt32->val = ipcp->ppp->ipv4->addr;
return 6;
}
static int ipaddr_send_conf_nak(struct ppp_ipcp_t *ipcp, struct ipcp_option_t *opt, uint8_t *ptr)
{
struct ipaddr_option_t *ipaddr_opt = container_of(opt, typeof(*ipaddr_opt), opt);
struct ipcp_opt32_t *opt32 = (struct ipcp_opt32_t *)ptr;
opt32->hdr.id = CI_ADDR;
opt32->hdr.len = 6;
opt32->val = ipcp->ppp->ipv4->peer_addr;
return 6;
}
static int ipaddr_recv_conf_req(struct ppp_ipcp_t *ipcp, struct ipcp_option_t *opt, uint8_t *ptr)
{
struct ipaddr_option_t *ipaddr_opt = container_of(opt, typeof(*ipaddr_opt), opt);
struct ipcp_opt32_t *opt32 = (struct ipcp_opt32_t *)ptr;
struct ifreq ifr;
struct sockaddr_in addr;
int r;
if (!ipcp->ppp->ipv4) {
r = alloc_ip(ipcp->ppp);
if (r)
return r;
}
if (opt32->hdr.len != 6)
return IPCP_OPT_REJ;
if (ipcp->ppp->ipv4->peer_addr == opt32->val) {
ipcp->delay_ack = ccp_ipcp_started(ipcp->ppp);
goto ack;
}
return IPCP_OPT_NAK;
ack:
memset(&ifr, 0, sizeof(ifr));
memset(&addr, 0, sizeof(addr));
strcpy(ifr.ifr_name, ipcp->ppp->ifname);
addr.sin_family = AF_INET;
addr.sin_addr.s_addr = ipcp->ppp->ipv4->addr;
memcpy(&ifr.ifr_addr,&addr,sizeof(addr));
if (ioctl(sock_fd, SIOCSIFADDR, &ifr))
log_ppp_error("ipcp: failed to set PA address: %s\n", strerror(errno));
addr.sin_addr.s_addr = ipcp->ppp->ipv4->peer_addr;
memcpy(&ifr.ifr_dstaddr,&addr,sizeof(addr));
if (ioctl(sock_fd, SIOCSIFDSTADDR, &ifr))
log_ppp_error("ipcp: failed to set remote PA address: %s\n", strerror(errno));
return IPCP_OPT_ACK;
}
static void ipaddr_print(void (*print)(const char *fmt,...),struct ipcp_option_t *opt, uint8_t *ptr)
{
struct ipaddr_option_t *ipaddr_opt=container_of(opt,typeof(*ipaddr_opt),opt);
struct ipcp_opt32_t *opt32=(struct ipcp_opt32_t*)ptr;
struct in_addr in = { .s_addr = 0, };
if (ptr)
in.s_addr = opt32->val;
else if (ipaddr_opt->ppp->ipv4)
in.s_addr = ipaddr_opt->ppp->ipv4->addr;
print("<addr %s>",inet_ntoa(in));
}
static void load_config(void)
{
const char *opt;
opt = conf_get_opt("ppp", "check-ip");
if (opt && atoi(opt) > 0)
conf_check_exists = 1;
}
static void ipaddr_opt_init()
{
ipcp_option_register(&ipaddr_opt_hnd);
load_config();
triton_event_register_handler(EV_CONFIG_RELOAD, (triton_event_func)load_config);
}
DEFINE_INIT(4, ipaddr_opt_init);
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