mirror of
https://github.com/ntop/n2n.git
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108 lines
3.4 KiB
C
108 lines
3.4 KiB
C
/*
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* (C) 2007-09 - Luca Deri <deri@ntop.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>
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*/
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#include "../n2n.h"
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#ifdef __ANDROID_NDK__
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#include <tun2tap/tun2tap.h>
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/* ********************************** */
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/** @brief Open and configure the TAP device for packet read/write.
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*
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* This routine creates the interface via the tuntap driver then uses ifconfig
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* to configure address/mask and MTU.
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*
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* @param device - [inout] a device info holder object
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* @param dev - user-defined name for the new iface,
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* if NULL system will assign a name
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* @param device_ip - address of iface
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* @param device_mask - netmask for device_ip
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* @param mtu - MTU for device_ip
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*
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* @return - negative value on error
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* - non-negative file-descriptor on success
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*/
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int tuntap_open(tuntap_dev *device,
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char *dev, /* user-definable interface name, eg. edge0 */
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const char *address_mode, /* static or dhcp */
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char *device_ip,
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char *device_mask,
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const char * device_mac,
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int mtu) {
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int i, n_matched;
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unsigned int mac[6];
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n_matched = sscanf(device_mac, "%x:%x:%x:%x:%x:%x", mac, mac + 1, mac + 2, mac + 3, mac + 4, mac + 5);
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if (n_matched != 6) {
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return -1;
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}
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memset(device->mac_addr, 0, sizeof(device->mac_addr));
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for (i = 0; i < 6; i++)
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device->mac_addr[i] = mac[i];
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device->ip_addr = inet_addr(device_ip);
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device->device_mask = inet_addr(device_mask);
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device->mtu = mtu;
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strncpy(device->dev_name, dev, MIN(IFNAMSIZ, N2N_IFNAMSIZ));
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return device->fd;
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}
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int tuntap_read(struct tuntap_dev *tuntap, unsigned char *buf, int len) {
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int rlen = read(tuntap->fd, buf + UIP_LLH_LEN, len - UIP_LLH_LEN);
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if ((rlen <= 0) || (rlen > N2N_PKT_BUF_SIZE - UIP_LLH_LEN))
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{
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return rlen;
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}
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uip_buf = buf;
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uip_len = rlen;
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uip_arp_out();
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if (IPBUF->ethhdr.type == htons(UIP_ETHTYPE_ARP))
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{
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traceEvent(TRACE_DEBUG, "ARP request packets are sent instead of packets");
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}
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return uip_len;
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}
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int tuntap_write(struct tuntap_dev *tuntap, unsigned char *buf, int len) {
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uip_buf = buf;
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uip_len = len;
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if (IPBUF->ethhdr.type == htons(UIP_ETHTYPE_IP)) {
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return write(tuntap->fd, buf + UIP_LLH_LEN, len - UIP_LLH_LEN);
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} else if (IPBUF->ethhdr.type == htons(UIP_ETHTYPE_ARP)) {
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uip_arp_arpin();
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if (uip_len > 0) {
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uip_arp_len = uip_len;
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memcpy(uip_arp_buf, uip_buf, uip_arp_len);
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traceEvent(TRACE_DEBUG, "ARP reply packet prepare to send");
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}
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return uip_len;
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}
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errno = EINVAL;
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return -1;
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}
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void tuntap_close(struct tuntap_dev *tuntap) {
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close(tuntap->fd);
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}
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void tuntap_get_address(struct tuntap_dev *tuntap) {
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}
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#endif /* #ifdef __ANDROID_NDK__ */
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