lokinet/vendor/libtuntap-master/tuntap-unix-linux.c

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/*
* Copyright (c) 2012 Tristan Le Guern <tleguern@bouledef.eu>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <linux/if.h>
#include <linux/if_tun.h>
#include <net/if_arp.h>
#include <fcntl.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "tuntap.h"
int
tuntap_sys_start(struct device *dev, int mode, int tun)
{
int fd;
int persist;
char *ifname;
struct ifreq ifr;
/* Get the persistence bit */
if(mode & TUNTAP_MODE_PERSIST)
{
mode &= ~TUNTAP_MODE_PERSIST;
persist = 1;
}
else
{
persist = 0;
}
/* Set the mode: tun or tap */
(void)memset(&ifr, '\0', sizeof ifr);
if(mode == TUNTAP_MODE_ETHERNET)
{
ifr.ifr_flags = IFF_TAP;
ifname = "tap%i";
}
else if(mode == TUNTAP_MODE_TUNNEL)
{
ifr.ifr_flags = IFF_TUN;
if(dev->if_name[0])
strncpy(ifr.ifr_name, dev->if_name, sizeof(ifr.ifr_name));
else
ifname = "tun%i";
}
else
{
tuntap_log(TUNTAP_LOG_ERR, "Invalid parameter 'mode'");
return -1;
}
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ifr.ifr_flags |= IFF_NO_PI;
if(tun < 0)
{
tuntap_log(TUNTAP_LOG_ERR, "Invalid parameter 'tun'");
return -1;
}
fd = -1;
if(dev->obtain_fd)
{
// for android
fd = dev->obtain_fd(dev);
if(fd == -1)
{
tuntap_log(TUNTAP_LOG_ERR, "failed to get network interface");
return -1;
}
return fd;
}
else
{
/* Open the clonable interface */
if((fd = open("/dev/net/tun", O_RDWR)) == -1)
{
tuntap_log(TUNTAP_LOG_ERR, "Can't open /dev/net/tun");
return -1;
}
}
/* Set the interface name, if any */
if(fd > TUNTAP_ID_MAX)
{
return -1;
}
if(ifr.ifr_name[0] == 0 && tun)
(void)snprintf(ifr.ifr_name, sizeof ifr.ifr_name, ifname, tun);
/* Save interface name *after* SIOCGIFFLAGS */
/* Configure the interface */
if(ioctl(fd, TUNSETIFF, &ifr) == -1)
{
tuntap_log(TUNTAP_LOG_ERR, "Can't set interface name");
return -1;
}
/* Set it persistent if needed */
if(persist == 1)
{
if(ioctl(fd, TUNSETPERSIST, 1) == -1)
{
tuntap_log(TUNTAP_LOG_ERR, "Can't set persistent");
return -1;
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}
}
/* Get the interface default values */
if(ioctl(dev->ctrl_sock, SIOCGIFFLAGS, &ifr) == -1)
{
tuntap_log(TUNTAP_LOG_ERR, "Can't get interface values");
return -1;
}
/* Save flags for tuntap_{up, down} */
dev->flags = ifr.ifr_flags;
/* Save interface name */
(void)memcpy(dev->if_name, ifr.ifr_name, sizeof ifr.ifr_name);
return fd;
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}
void
tuntap_sys_destroy(struct device *dev)
{
if(ioctl(dev->tun_fd, TUNSETPERSIST, 0) == -1)
{
tuntap_log(TUNTAP_LOG_WARN, "Can't destroy the interface");
}
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}
int
tuntap_sys_set_ipv4(struct device *dev, t_tun_in_addr *s4, uint32_t bits)
{
struct ifreq ifr;
struct sockaddr_in mask;
(void)memset(&ifr, '\0', sizeof ifr);
(void)memcpy(ifr.ifr_name, dev->if_name, sizeof dev->if_name);
/* Set the IP address first */
(void)memcpy(&(((struct sockaddr_in *)&ifr.ifr_addr)->sin_addr), s4,
sizeof(struct in_addr));
ifr.ifr_addr.sa_family = AF_INET;
if(ioctl(dev->ctrl_sock, SIOCSIFADDR, &ifr) == -1)
{
tuntap_log(TUNTAP_LOG_ERR, "Can't set IP address");
return -1;
}
/* Reinit the struct ifr */
(void)memset(&ifr.ifr_addr, '\0', sizeof ifr.ifr_addr);
/* Then set the netmask */
(void)memset(&mask, '\0', sizeof mask);
mask.sin_family = AF_INET;
mask.sin_addr.s_addr = bits;
(void)memcpy(&ifr.ifr_netmask, &mask, sizeof ifr.ifr_netmask);
if(ioctl(dev->ctrl_sock, SIOCSIFNETMASK, &ifr) == -1)
{
tuntap_log(TUNTAP_LOG_ERR, "Can't set netmask");
return -1;
}
return 0;
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}
int
tuntap_sys_set_ipv6(struct device *dev, t_tun_in6_addr *s6, uint32_t bits)
{
(void)dev;
(void)s6;
(void)bits;
tuntap_log(TUNTAP_LOG_NOTICE, "IPv6 is not implemented on your system");
return -1;
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}
int
tuntap_sys_set_ifname(struct device *dev, const char *ifname, size_t len)
{
struct ifreq ifr;
(void)strncpy(ifr.ifr_name, dev->if_name, IF_NAMESIZE);
(void)strncpy(ifr.ifr_newname, ifname, len);
if(ioctl(dev->ctrl_sock, SIOCSIFNAME, &ifr) == -1)
{
perror(NULL);
tuntap_log(TUNTAP_LOG_ERR, "Can't set interface name");
return -1;
}
return 0;
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}
int
tuntap_sys_set_descr(struct device *dev, const char *descr, size_t len)
{
(void)dev;
(void)descr;
(void)len;
tuntap_log(TUNTAP_LOG_NOTICE,
"Your system does not support tuntap_set_descr()");
return -1;
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}