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#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <sys/ioctl.h>
#include <arpa/inet.h>
#include <linux/ppp_defs.h>
#include <linux/if_ppp.h>
#include "triton/triton.h"
#include "ppp.h"
#include "ppp_fsm.h"
#include "log.h"
#include "events.h"
static void ppp_read(struct triton_md_handler_t*);
static void ppp_write(struct triton_md_handler_t*);
static void ppp_timeout(struct triton_md_handler_t*);
struct ppp_t *alloc_ppp(void)
{
struct ppp_t *ppp=malloc(sizeof(*ppp));
memset(ppp,0,sizeof(*ppp));
ppp->out_buf=malloc(PPP_MTU+PPP_HDRLEN);
ppp->in_buf=malloc(PPP_MRU+PPP_HDRLEN);
ppp->mtu=PPP_MTU;
ppp->mru=PPP_MRU;
return ppp;
}
int establish_ppp(struct ppp_t *ppp)
{
/* Open an instance of /dev/ppp and connect the channel to it */
if (ioctl(ppp->fd, PPPIOCGCHAN, &ppp->chan_idx)==-1)
{
log_error("Couldn't get channel number\n");
return -1;
}
ppp->chan_fd=open("/dev/ppp", O_RDWR);
if (ppp->chan_fd<0)
{
log_error("Couldn't reopen /dev/ppp\n");
return -1;
}
if (ioctl(ppp->chan_fd, PPPIOCATTCHAN, &ppp->chan_idx)<0)
{
log_error("Couldn't attach to channel %d\n", ppp->chan_idx);
goto exit_close_chan;
}
ppp->unit_fd=open("/dev/ppp", O_RDWR);
if (ppp->unit_fd<0)
{
log_error("Couldn't reopen /dev/ppp\n");
goto exit_close_chan;
}
ppp->unit_idx=-1;
if (ioctl(ppp->unit_fd, PPPIOCNEWUNIT, &ppp->unit_idx)<0)
{
log_error("Couldn't create new ppp unit\n");
goto exit_clodse_unit;
}
if (ioctl(ppp->chan_fd, PPPIOCCONNECT, &ppp->unit_idx)<0)
{
log_error("Couldn't attach to PPP unit %d\n", ppp->unit_idx);
goto exit_clodse_unit;
}
log_info("connect: ppp%i <--> pptp(%s)\n",ppp->unit_idx,ppp->chan_name);
ppp->h=malloc(sizeof(*ppp->h));
memset(ppp->h,0,sizeof(*ppp->h));
ppp->h->pd=ppp;
ppp->h->fd=ppp->chan_fd;
ppp->h->read=ppp_read;
ppp->h->write=ppp_write;
ppp->h->timeout=ppp_timeout;
ppp->h->twait=-1;
triton_md_register_handler(ppp->h);
triton_md_enable_handler(ppp->h,MD_MODE_READ);
INIT_LIST_HEAD(&ppp->handlers);
ppp->cur_layer=PPP_LAYER_LCP;
lcp_start(ppp);
return 0;
exit_clodse_unit:
close(ppp->unit_fd);
exit_close_chan:
close(ppp->chan_fd);
return -1;
}
void print_buf(uint8_t *buf,int size)
{
int i;
for(i=0;i<size;i++)
printf("%x ",buf[i]);
printf("\n");
}
int ppp_send(struct ppp_t *ppp, void *data, int size)
{
int n;
if (ppp->out_buf_size) return -1;
if (size>PPP_MTU+PPP_HDRLEN) return -1;
printf("ppp: send: ");
print_buf((uint8_t*)data,size);
n=write(ppp->unit_fd,data,size);
/*if (n>=0)
{
if (n!=ppp->out_buf_size-ppp->out_buf_pos)
{
ppp->out_buf_pos+=n;
triton_md_enable_handler(ppp->h,MD_MODE_WRITE);
}
}*/
return n;
}
static void ppp_read(struct triton_md_handler_t*h)
{
struct ppp_t *ppp=(struct ppp_t *)h->pd;
struct ppp_handler_t *ppp_h=NULL;
uint16_t proto;
ppp->in_buf_size=read(h->fd,ppp->in_buf,PPP_MRU+PPP_HDRLEN);
printf("ppp: recv: ");
print_buf(ppp->in_buf,ppp->in_buf_size);
proto=ntohs(*(uint16_t*)ppp->in_buf);
list_for_each_entry(ppp_h,&ppp->handlers,entry)
{
if (ppp_h->proto==proto)
{
ppp_h->recv(ppp_h);
return;
}
}
log_warn("discarding unknown packet %x\n",proto);
}
static void ppp_write(struct triton_md_handler_t*h)
{
struct ppp_t *ppp=(struct ppp_t *)h->pd;
int n=write(ppp->unit_fd,ppp->out_buf+ppp->out_buf_pos,ppp->out_buf_size-ppp->out_buf_pos);
if (n>=0)
{
ppp->out_buf_pos+=n;
if (ppp->out_buf_pos==ppp->out_buf_size)
{
triton_md_disable_handler(ppp->h,MD_MODE_WRITE);
ppp->out_buf_pos=0;
ppp->out_buf_size=0;
}
}
}
static void ppp_timeout(struct triton_md_handler_t*h)
{
}
void ppp_layer_started(struct ppp_t *ppp)
{
switch(ppp->cur_layer)
{
case PPP_LAYER_LCP:
ppp->cur_layer++;
if (auth_start(ppp))
break;
case PPP_LAYER_AUTH:
ppp->cur_layer++;
if (ccp_start(ppp))
break;
case PPP_LAYER_CCP:
ppp->cur_layer++;
if (ipcp_start(ppp))
break;
case PPP_LAYER_IPCP:
break;
}
}
void ppp_terminate(struct ppp_t *ppp)
{
switch(ppp->cur_layer)
{
case PPP_LAYER_IPCP:
ppp->cur_layer--;
ipcp_finish(ppp);
case PPP_LAYER_CCP:
ppp->cur_layer--;
ccp_finish(ppp);
case PPP_LAYER_AUTH:
ppp->cur_layer--;
auth_finish(ppp);
case PPP_LAYER_LCP:
ppp->cur_layer--;
lcp_finish(ppp);
}
}
void ppp_register_handler(struct ppp_t *ppp,struct ppp_handler_t *h)
{
list_add_tail(&h->entry,&ppp->handlers);
}
void ppp_unregister_handler(struct ppp_t *ppp,struct ppp_handler_t *h)
{
list_del(&h->entry);
}
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