PF_RING-5.6.0/userland/c++/PFring.cpp

/*
 *
 * (C) 2007-09 - Luca Deri <deri@ntop.org>
 *
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

#include "PFring.h"
#include <string.h>
#include <stdlib.h>
#include <poll.h>
#include <errno.h>

/* *********************************************** */

PFring::PFring(char* _device_name, u_int _snaplen, u_int flags) {
  snaplen = _snaplen, device_name = NULL;

  if(_device_name == NULL)
    ring = NULL;
  else {
    if((ring = pfring_open(_device_name, _snaplen, flags)) != NULL)
      device_name = strdup(_device_name);
  }
}

/* *********************************************** */

PFring::~PFring() {
  if(ring) {
    if(device_name) free(device_name);
    pfring_close(ring);
    ring = NULL;
  }
}

/* *********************************************** */

int PFring::add_bpf_filter(char *the_filter) {
  if(ring == NULL)
    return(-1);
  else
    return(pfring_set_bpf_filter(ring, the_filter));
}

/* *********************************************** */

int PFring::get_next_packet(struct pfring_pkthdr *hdr, const u_char *pkt, u_int pkt_len) {
  if((!ring) || (!hdr) || (pkt_len < snaplen)) return(-1);

  return(pfring_recv(ring, (u_char**)&pkt, pkt_len, hdr, 1 /* wait_for_incoming_packet */));
}

/* *********************************************** */

bool PFring::wait_for_packets(int msec) {
  struct pollfd pfd;
  int rc;

  /* Sleep when nothing is happening */
  pfd.fd      = get_socket_id();
  pfd.events  = POLLIN|POLLERR;
  pfd.revents = 0;

  errno = 0;
  rc = poll(&pfd, 1, msec);

  if(rc == -1)
    return(false);
  else
    return((rc > 0) ? true : false);
}