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#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <arpa/inet.h>
#include <net/if.h>
#include <sys/ioctl.h>
#include <linux/if_ppp.h>
#include "ppp.h"
#include "ppp_ipcp.h"
#include "log.h"
#include "ipdb.h"
#include "iprange.h"
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 ipdb_item_t *ip;
};
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;
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 (ipaddr_opt->ip)
ipdb_put(ipcp->ppp, ipaddr_opt->ip);
free(ipaddr_opt);
}
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;
if (!ipaddr_opt->ip) {
ipaddr_opt->ip = ipdb_get(ipcp->ppp);
if (!ipaddr_opt->ip) {
log_warn("ppp:ipcp: no free IP address\n");
return -1;
}
}
if (!iprange_client_check(ipaddr_opt->ip->peer_addr)) {
log_warn("ppp:ipcp: to avoid hard loops requested IP cannot be assigned (%i.%i.%i.%i)\n",
ipaddr_opt->ip->peer_addr&0xff,
(ipaddr_opt->ip->peer_addr >> 8)&0xff,
(ipaddr_opt->ip->peer_addr >> 16)&0xff,
(ipaddr_opt->ip->peer_addr >> 24)&0xff);
return -1;
}
opt32->hdr.id=CI_ADDR;
opt32->hdr.len=6;
opt32->val=ipaddr_opt->ip->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=ipaddr_opt->ip->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;
struct npioctl np;
if (ipaddr_opt->ip->peer_addr == opt32->val)
goto ack;
/*if (!ipaddr_opt->peer_addr) {
ipaddr_opt->peer_addr = opt32->val;
goto ack;
}*/
return IPCP_OPT_NAK;
ack:
memset(&ifr, 0, sizeof(ifr));
memset(&addr, 0, sizeof(addr));
sprintf(ifr.ifr_name,"ppp%i",ipcp->ppp->unit_idx);
addr.sin_family = AF_INET;
addr.sin_addr.s_addr = ipaddr_opt->ip->addr;
memcpy(&ifr.ifr_addr,&addr,sizeof(addr));
if (ioctl(sock_fd, SIOCSIFADDR, &ifr))
log_error("\nipcp: failed to set PA address: %s\n", strerror(errno));
addr.sin_addr.s_addr = ipaddr_opt->ip->peer_addr;
memcpy(&ifr.ifr_dstaddr,&addr,sizeof(addr));
if (ioctl(sock_fd, SIOCSIFDSTADDR, &ifr))
log_error("\nipcp: failed to set remote PA address: %s\n", strerror(errno));
if (ioctl(sock_fd, SIOCGIFFLAGS, &ifr))
log_error("\nipcp: failed to get interface flags: %s\n", strerror(errno));
ifr.ifr_flags |= IFF_UP | IFF_POINTOPOINT;
if (ioctl(sock_fd, SIOCSIFFLAGS, &ifr))
log_error("\nipcp: failed to set interface flags: %s\n", strerror(errno));
np.protocol = PPP_IP;
np.mode = NPMODE_PASS;
if (ioctl(ipcp->ppp->unit_fd, PPPIOCSNPMODE, &np))
log_error("\nipcp: failed to set NP mode: %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->ip)
in.s_addr = ipaddr_opt->ip->addr;
print("<addr %s>",inet_ntoa(in));
}
static void __init ipaddr_opt_init()
{
ipcp_option_register(&ipaddr_opt_hnd);
}
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