[prev in list] [next in list] [prev in thread] [next in thread] 

List:       linux-ppp
Subject:    Re: Need some help on implementation of PPP under Linux kernel mode
From:       <houcheng () turbonetworks ! com ! tw>
Date:       2003-01-06 7:19:19
[Download RAW message or body]

Hi:

    Thanks for your reply.  I've write a small program to make some
experiments

with /dev/ppp. The little program first create a pppoe socket and then
create

a ppp0 network interface. Any furthur advices to my program is very
appreciate!



Lin Houcheng



[Program Part]
int main(int argc, char ** argv) {
    int fd;
    char ch;

    fd = PPPOEConnectDevice(); // create a fd for end-to-end pppoe session
    printf("fd is %d\n", fd);
 ppp_dev_fd = open("/dev/ppp", O_RDWR);
 if (ppp_dev_fd < 0)
     printf("Couldn't open /dev/ppp: %m");

    generic_establish_ppp (fd);

    while(ch != 'q')
        ch = getchar();

}


int generic_establish_ppp (int fd)
{
    int x;


 /* Open another instance of /dev/ppp and connect the channel to it */
 int flags;
    printf("call here\n");
 if (ioctl(fd, PPPIOCGCHAN, &chindex) == -1) {
     printf("Couldn't get channel number: %d\n", chindex);
     goto err;
 }
 ppp_fd = fd;

 printf("using channel %d\n", chindex);
 // reopen an PPP fd, use to connect ...
 fd = open("/dev/ppp", O_RDWR);
 if (fd < 0) {
     printf("Couldn't reopen /dev/ppp: \n");
     goto err;
 }
 printf("fd is %d\n", fd);
 if (ioctl(fd, PPPIOCATTCHAN, &chindex) < 0) {
     printf("Couldn't attach to channel %d", chindex);
     goto err_close;
 }
 printf("ioctl ok\n");

 flags = fcntl(fd, F_GETFL);
 if (flags == -1 || fcntl(fd, F_SETFL, flags | O_NONBLOCK) == -1)
     printf("Couldn't set /dev/ppp (channel) to nonblock:\n");


    printf("fcntl ok\n");
 if (!looped)
     ifunit = -1;

     /*
      * Create a new PPP unit.
      */
     if (make_ppp_unit() < 0)
  goto err_close;

    printf("make ok\n");
 if (looped)
     set_flags(ppp_dev_fd, get_flags(ppp_dev_fd) & ~SC_LOOP_TRAFFIC);

 // if (!multilink) {
     // printf("add_fd %d\n", ppp_dev_fd);
     // add_fd(ppp_dev_fd);
     if (ioctl(ppp_fd, PPPIOCCONNECT, &ifunit) < 0) {
      printf("Couldn't attach to PPP unit %d: \n", ifunit);
      goto err_close;
     }
 // }
    looped = 0;
    return ppp_fd;
 err_close:
    close(fd);
 err:
    return -1;
}



static int make_ppp_unit()
{
 int x;
    printf("errno:%d\n", errno);
 ifunit = 0; // req_unit;
 x = ioctl(ppp_dev_fd, PPPIOCNEWUNIT, &ifunit);
 // if (x < 0 && req_unit >= 0 && errno == EEXIST) {
 if (x < 0 && errno == EEXIST) {
  printf("Couldn't allocate PPP unit %d as it is already in use\n");
  ifunit = -1;
  x = ioctl(ppp_dev_fd, PPPIOCNEWUNIT, &ifunit);
 }
 if (x < 0) {
  printf("Couldn't create new ppp unit: by errno %d\n", errno);
 }
 return x;
}


-
To unsubscribe from this list: send the line "unsubscribe linux-ppp" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
[prev in list] [next in list] [prev in thread] [next in thread]