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vdetap.c

/* Copyright 2004 Renzo Davoli
 * Reseased under the GPLv2 */

#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <stdint.h>
#include <sys/select.h>
#include <sys/poll.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <vde.h>
#include <libvdeplug/libvdeplug.h>
#include <pwd.h>

#define SWITCH_MAGIC 0xfeedface
#define BUFSIZE 2048
#define MAXDESCR 128

VDECONN *conn;

static unsigned char bufin[BUFSIZE];

static struct pollfd pollv[]={{0,POLLIN|POLLHUP,0},{0,POLLIN|POLLHUP,0}};

main(int argc,char *argv[])
{
      int fd,fddata;
      struct sockaddr_un dataout,datain;
      socklen_t datainsize;
      int result,nx;
      register int i;
      struct vde_open_args open_args={.port=0,.group=NULL,.mode=0700};
      /*printf("argc = %d\n",argc);
      for (i=0;i<argc;i++)
            printf("argv %d -%s-\n",i,argv[i]);*/
      if (argc != 4 && argv[0][0] != '-') {
            fprintf(stderr,"vdetap must be activated by libvdetap e.g.\n"
                        "   sh%% export LD_PRELOAD=%s/libvdetap.so\n"
                        "   csh%% setenv LD_PRELOAD %s/libvdetap.so\n", LIBEXECDIR, LIBEXECDIR);
            exit (-1);
      }

      fd = atoi(argv[1]);
      for (i=3;i<FD_SETSIZE;i++)
            if (i != fd)
                  close(i);
      if((fddata = socket(AF_UNIX, SOCK_DGRAM, 0)) < 0){
            perror("socket");
            exit(1);
      }
      /* TODO insert argv[3] in descr */
      conn=vde_open(argv[2],"tuntaplib",&open_args);
      pollv[0].fd=fd;
      pollv[1].fd=vde_datafd(conn);
      for(;;) {
            result=poll(pollv,2,-1);
            if (pollv[0].revents & POLLHUP || pollv[1].revents & POLLHUP)
                  break;
            if (pollv[0].revents & POLLIN) {
                  nx=read(fd,bufin,sizeof(bufin));
                  /*fprintf(stderr,"RX from pgm %d\n",nx);*/
                  //send(connected_fd,bufin,nx,0);
                  vde_send(conn,bufin,nx,0);
            }
            if (pollv[1].revents & POLLIN) {
                  datainsize=sizeof(datain);
                  nx=vde_recv(conn,bufin,BUFSIZE,0);
                  /*fprintf(stderr,"TX to pgm %d\n",nx);*/
                  write(fd,bufin,nx);
            }
      }
      vde_close(conn);
}


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