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#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.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->layers);
ppp->lcp_layer=ppp_lcp_init(ppp);
ppp_fsm_open(ppp->lcp_layer);
ppp_fsm_lower_up(ppp->lcp_layer);
return 0;
exit_clodse_unit:
close(ppp->unit_fd);
exit_close_chan:
close(ppp->chan_fd);
return -1;
}
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;
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_hdr_t *hdr=(struct ppp_hdr_t *)(ppp->in_buf+2);
u_int16_t proto;
ppp->in_buf_size=read(h->fd,ppp->in_buf,PPP_MRU+PPP_HDRLEN);
//if (ppp->in_buf_size==0)
if (ppp->in_buf_size<PPP_HDRLEN+2 || ppp->in_buf_size<ntohs(hdr->len)+2)
{
log_warn("discarding short packet\n");
return;
}
proto=ntohs(*(u_int16_t*)ppp->in_buf);
if (proto==PPP_LCP) ppp->lcp_layer->recv(ppp->lcp_layer,hdr);
else if (ppp->lcp_layer->fsm_state!=FSM_Opened)
{
log_warn("discarding non-LCP packet when LCP is not opened\n");
return;
}else
{
struct ppp_layer_t *l=NULL;
list_for_each_entry(l,&ppp->layers,entry)
{
if (l->proto==proto) l->recv(l,hdr);
}
if (!l)
{
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)
{
}
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