mirror of
https://github.com/ntop/n2n.git
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135 lines
3.8 KiB
C
135 lines
3.8 KiB
C
/**
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* (C) 2007-20 - ntop.org and contributors
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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 see <http://www.gnu.org/licenses/>
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*
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*/
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#include "n2n.h"
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#ifdef __APPLE__
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void tun_close(tuntap_dev *device);
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/* ********************************** */
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#define N2N_OSX_TAPDEVICE_SIZE 32
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int tuntap_open(tuntap_dev *device /* ignored */,
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char *dev,
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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;
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char tap_device[N2N_OSX_TAPDEVICE_SIZE];
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for (i = 0; i < 255; i++) {
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snprintf(tap_device, sizeof(tap_device), "/dev/tap%d", i);
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device->fd = open(tap_device, O_RDWR);
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if(device->fd > 0) {
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traceEvent(TRACE_NORMAL, "Succesfully open %s", tap_device);
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break;
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}
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}
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if(device->fd < 0) {
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traceEvent(TRACE_ERROR, "Unable to open any tap devices /dev/tap0 through /dev/tap254. Is this user properly authorized to access those descriptors?");
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traceEvent(TRACE_ERROR, "Please read https://github.com/ntop/n2n/blob/dev/doc/macOS.md");
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return(-1);
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} else {
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char buf[256];
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FILE *fd;
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device->ip_addr = inet_addr(device_ip);
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if ( device_mac && device_mac[0] != '\0' )
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{
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/* FIXME - This is not tested. Might be wrong syntax for OS X */
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/* Set the hw address before bringing the if up. */
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snprintf(buf, sizeof(buf), "ifconfig tap%d ether %s",
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i, device_mac);
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system(buf);
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}
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snprintf(buf, sizeof(buf), "ifconfig tap%d %s netmask %s mtu %d up",
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i, device_ip, device_mask, mtu);
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system(buf);
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traceEvent(TRACE_NORMAL, "Interface tap%d up and running (%s/%s)",
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i, device_ip, device_mask);
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/* Read MAC address */
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snprintf(buf, sizeof(buf), "ifconfig tap%d |grep ether|cut -c 8-24", i);
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/* traceEvent(TRACE_INFO, "%s", buf); */
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fd = popen(buf, "r");
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if(fd < 0) {
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tuntap_close(device);
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return(-1);
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} else {
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int a, b, c, d, e, f;
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buf[0] = 0;
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fgets(buf, sizeof(buf), fd);
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pclose(fd);
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if(buf[0] == '\0') {
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traceEvent(TRACE_ERROR, "Unable to read tap%d interface MAC address");
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exit(0);
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}
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traceEvent(TRACE_NORMAL, "Interface tap%d [MTU %d] mac %s", i, mtu, buf);
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if(sscanf(buf, "%02x:%02x:%02x:%02x:%02x:%02x", &a, &b, &c, &d, &e, &f) == 6) {
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device->mac_addr[0] = a, device->mac_addr[1] = b;
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device->mac_addr[2] = c, device->mac_addr[3] = d;
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device->mac_addr[4] = e, device->mac_addr[5] = f;
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}
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}
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}
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/* read_mac(dev, device->mac_addr); */
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return(device->fd);
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}
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/* ********************************** */
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int tuntap_read(struct tuntap_dev *tuntap, unsigned char *buf, int len) {
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return(read(tuntap->fd, buf, len));
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}
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/* ********************************** */
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int tuntap_write(struct tuntap_dev *tuntap, unsigned char *buf, int len) {
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return(write(tuntap->fd, buf, len));
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}
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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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/* Fill out the ip_addr value from the interface. Called to pick up dynamic
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* address changes. */
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void tuntap_get_address(struct tuntap_dev *tuntap)
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{
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}
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#endif /* __APPLE__ */
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