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@ -39,24 +39,23 @@
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#include "tuntap.h"
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static int
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tuntap_sys_create_dev(struct device *dev, int mode, int tun) {
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struct ifreq ifr;
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char *name;
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if (mode == TUNTAP_MODE_ETHERNET)
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name = "tap%i";
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else
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name = "tun%i";
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/* At this point 'tun' can't be TUNTAP_ID_ANY */
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(void)memset(&ifr, '\0', sizeof ifr);
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(void)snprintf(ifr.ifr_name, IF_NAMESIZE, name, tun);
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if (ioctl(dev->ctrl_sock, SIOCIFCREATE, &ifr) == -1) {
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tuntap_log(TUNTAP_LOG_ERR, "Can't set persistent");
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return -1;
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}
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return 0;
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tuntap_sys_create_dev(struct device *dev, int mode, int tun)
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{
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struct ifreq ifr;
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char *name;
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name = "tun%i";
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/* At this point 'tun' can't be TUNTAP_ID_ANY */
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(void)memset(&ifr, '\0', sizeof ifr);
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(void)snprintf(ifr.ifr_name, IF_NAMESIZE, name, tun);
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if(ioctl(dev->ctrl_sock, SIOCIFCREATE, &ifr) == -1)
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{
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tuntap_log(TUNTAP_LOG_ERR, "Can't set persistent");
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return -1;
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}
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return 0;
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}
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/*
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@ -64,237 +63,215 @@ tuntap_sys_create_dev(struct device *dev, int mode, int tun) {
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* To access /dev/tapN we have to create it before.
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*/
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static int
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tuntap_sys_start_tap(struct device *dev, int tun) {
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int fd;
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struct ifreq ifr;
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struct ifaddrs *ifa;
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char name[IF_NAMESIZE + 5]; /* For /dev/IFNAMSIZ */
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fd = -1;
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(void)memset(&ifr, '\0', sizeof ifr);
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(void)memset(name, '\0', sizeof name);
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/* Set the device path to open */
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if (tun < TUNTAP_ID_MAX) {
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/* Create the wanted device */
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tuntap_sys_create_dev(dev, TUNTAP_MODE_ETHERNET, tun);
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(void)snprintf(name, sizeof name, "/dev/tap%i", tun);
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} else if (tun == TUNTAP_ID_ANY) {
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/* Or use autocloning */
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(void)memcpy(name, "/dev/tap", 8);
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} else {
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return -1;
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}
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if ((fd = open(name, O_RDWR)) == -1) {
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char buf[11 + MAXPATHLEN];
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(void)memset(buf, 0, sizeof buf);
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snprintf(buf, sizeof buf, "Can't open %s", name);
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tuntap_log(TUNTAP_LOG_DEBUG, buf);
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return -1;
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}
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/* Get the interface name */
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if (ioctl(fd, TAPGIFNAME, &ifr) == -1) {
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tuntap_log(TUNTAP_LOG_ERR, "Can't get interface name");
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return -1;
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}
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(void)strlcpy(dev->if_name, ifr.ifr_name, sizeof dev->if_name);
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/* Get the interface default values */
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if (ioctl(fd, SIOCGIFFLAGS, &ifr) == -1) {
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tuntap_log(TUNTAP_LOG_ERR, "Can't get interface values");
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return -1;
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}
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/* Save flags for tuntap_{up, down} */
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dev->flags = ifr.ifr_flags;
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/* Save pre-existing MAC address */
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if (getifaddrs(&ifa) == 0) {
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struct ifaddrs *pifa;
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for (pifa = ifa; pifa != NULL; pifa = pifa->ifa_next) {
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if (strcmp(pifa->ifa_name, dev->if_name) == 0) {
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struct ether_addr eth_addr;
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/*
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* The MAC address is from 10 to 15.
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*
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* And yes, I know, the buffer is supposed
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* to have a size of 14 bytes.
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*/
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(void)memcpy(dev->hwaddr,
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pifa->ifa_addr->sa_data + 10,
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ETHER_ADDR_LEN);
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(void)memset(ð_addr.ether_addr_octet, 0,
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ETHER_ADDR_LEN);
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(void)memcpy(ð_addr.ether_addr_octet,
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pifa->ifa_addr->sa_data + 10,
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ETHER_ADDR_LEN);
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break;
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}
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}
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if (pifa == NULL)
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tuntap_log(TUNTAP_LOG_WARN,
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"Can't get link-layer address");
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freeifaddrs(ifa);
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}
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return fd;
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tuntap_sys_start_tap(struct device *dev, int tun)
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{
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int fd;
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struct ifreq ifr;
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struct ifaddrs *ifa;
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char name[IF_NAMESIZE + 5]; /* For /dev/IFNAMSIZ */
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fd = -1;
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(void)memset(&ifr, '\0', sizeof ifr);
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(void)memset(name, '\0', sizeof name);
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/* Set the device path to open */
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if(tun < TUNTAP_ID_MAX)
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{
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/* Create the wanted device */
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tuntap_sys_create_dev(dev, TUNTAP_MODE_ETHERNET, tun);
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(void)snprintf(name, sizeof name, "/dev/tap%i", tun);
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}
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else if(tun == TUNTAP_ID_ANY)
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{
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/* Or use autocloning */
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(void)memcpy(name, "/dev/tap", 8);
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}
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else
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{
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return -1;
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}
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if((fd = open(name, O_RDWR)) == -1)
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{
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char buf[11 + MAXPATHLEN];
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(void)memset(buf, 0, sizeof buf);
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snprintf(buf, sizeof buf, "Can't open %s", name);
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tuntap_log(TUNTAP_LOG_DEBUG, buf);
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return -1;
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}
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/* Get the interface name */
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if(ioctl(fd, TAPGIFNAME, &ifr) == -1)
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{
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tuntap_log(TUNTAP_LOG_ERR, "Can't get interface name");
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return -1;
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}
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(void)strlcpy(dev->if_name, ifr.ifr_name, sizeof dev->if_name);
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/* Get the interface default values */
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if(ioctl(fd, SIOCGIFFLAGS, &ifr) == -1)
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{
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tuntap_log(TUNTAP_LOG_ERR, "Can't get interface values");
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return -1;
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}
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/* Save flags for tuntap_{up, down} */
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dev->flags = ifr.ifr_flags;
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return fd;
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}
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static int
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tuntap_sys_start_tun(struct device *dev, int tun) {
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struct ifreq ifr;
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char name[MAXPATHLEN];
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int fd;
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/*
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* Try to use the given driver, or loop throught the avaible ones
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*/
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fd = -1;
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if (tun < TUNTAP_ID_MAX) {
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(void)snprintf(name, sizeof name, "/dev/tun%i", tun);
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fd = open(name, O_RDWR);
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} else if (tun == TUNTAP_ID_ANY) {
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for (tun = 0; tun < TUNTAP_ID_MAX; ++tun) {
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(void)memset(name, '\0', sizeof name);
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(void)snprintf(name, sizeof name, "/dev/tun%i", tun);
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if ((fd = open(name, O_RDWR)) > 0)
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break;
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}
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} else {
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return -1;
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}
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switch (fd) {
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case -1:
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tuntap_log(TUNTAP_LOG_ERR, "Permission denied");
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return -1;
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case 256:
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tuntap_log(TUNTAP_LOG_ERR, "Can't find a tun entry");
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return -1;
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default:
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/* NOTREACHED */
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break;
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}
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/* Set the interface name */
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(void)memset(&ifr, '\0', sizeof ifr);
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(void)snprintf(ifr.ifr_name, sizeof ifr.ifr_name, "tun%i", tun);
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/* And save it */
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(void)strlcpy(dev->if_name, ifr.ifr_name, sizeof dev->if_name);
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/* Get the interface default values */
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if (ioctl(dev->ctrl_sock, SIOCGIFFLAGS, &ifr) == -1) {
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tuntap_log(TUNTAP_LOG_ERR, "Can't get interface values");
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return -1;
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}
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/* Save flags for tuntap_{up, down} */
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dev->flags = ifr.ifr_flags;
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return fd;
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tuntap_sys_start_tun(struct device *dev, int tun)
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{
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struct ifreq ifr;
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char name[MAXPATHLEN];
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int fd;
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/*
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* Try to use the given driver, or loop throught the avaible ones
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*/
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fd = -1;
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if(tun < TUNTAP_ID_MAX)
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{
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(void)snprintf(name, sizeof name, "/dev/tun%i", tun);
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fd = open(name, O_RDWR);
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}
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else if(tun == TUNTAP_ID_ANY)
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{
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for(tun = 0; tun < TUNTAP_ID_MAX; ++tun)
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{
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(void)memset(name, '\0', sizeof name);
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(void)snprintf(name, sizeof name, "/dev/tun%i", tun);
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if((fd = open(name, O_RDWR)) > 0)
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break;
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}
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}
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else
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{
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return -1;
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}
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switch(fd)
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{
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case -1:
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tuntap_log(TUNTAP_LOG_ERR, "Permission denied");
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return -1;
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case 256:
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tuntap_log(TUNTAP_LOG_ERR, "Can't find a tun entry");
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return -1;
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default:
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/* NOTREACHED */
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break;
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}
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/* Set the interface name */
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(void)memset(&ifr, '\0', sizeof ifr);
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(void)snprintf(ifr.ifr_name, sizeof ifr.ifr_name, "tun%i", tun);
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/* And save it */
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(void)strlcpy(dev->if_name, ifr.ifr_name, sizeof dev->if_name);
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/* Get the interface default values */
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if(ioctl(dev->ctrl_sock, SIOCGIFFLAGS, &ifr) == -1)
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{
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tuntap_log(TUNTAP_LOG_ERR, "Can't get interface values");
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return -1;
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}
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/* Save flags for tuntap_{up, down} */
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dev->flags = ifr.ifr_flags;
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return fd;
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}
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int
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tuntap_sys_start(struct device *dev, int mode, int tun) {
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int fd;
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/* Force creation of the driver if needed or let it resilient */
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if (mode & TUNTAP_MODE_PERSIST) {
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mode &= ~TUNTAP_MODE_PERSIST;
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if (tuntap_sys_create_dev(dev, mode, tun) == -1)
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return -1;
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}
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/* tun and tap devices are not created in the same way */
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if (mode == TUNTAP_MODE_ETHERNET) {
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fd = tuntap_sys_start_tap(dev, tun);
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}
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else if (mode == TUNTAP_MODE_TUNNEL) {
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fd = tuntap_sys_start_tun(dev, tun);
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}
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else {
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return -1;
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}
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return fd;
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tuntap_sys_start(struct device *dev, int mode, int tun)
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{
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int fd;
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/* Force creation of the driver if needed or let it resilient */
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if(mode & TUNTAP_MODE_PERSIST)
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{
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|
|
mode &= ~TUNTAP_MODE_PERSIST;
|
|
|
|
|
if(tuntap_sys_create_dev(dev, mode, tun) == -1)
|
|
|
|
|
return -1;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* tun and tap devices are not created in the same way */
|
|
|
|
|
if(mode == TUNTAP_MODE_ETHERNET)
|
|
|
|
|
{
|
|
|
|
|
fd = tuntap_sys_start_tap(dev, tun);
|
|
|
|
|
}
|
|
|
|
|
else if(mode == TUNTAP_MODE_TUNNEL)
|
|
|
|
|
{
|
|
|
|
|
fd = tuntap_sys_start_tun(dev, tun);
|
|
|
|
|
}
|
|
|
|
|
else
|
|
|
|
|
{
|
|
|
|
|
return -1;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
return fd;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
void
|
|
|
|
|
tuntap_sys_destroy(struct device *dev) {
|
|
|
|
|
struct ifreq ifr;
|
|
|
|
|
tuntap_sys_destroy(struct device *dev)
|
|
|
|
|
{
|
|
|
|
|
struct ifreq ifr;
|
|
|
|
|
|
|
|
|
|
(void)memset(&ifr, '\0', sizeof ifr);
|
|
|
|
|
(void)strlcpy(ifr.ifr_name, dev->if_name, sizeof ifr.ifr_name);
|
|
|
|
|
(void)memset(&ifr, '\0', sizeof ifr);
|
|
|
|
|
(void)strlcpy(ifr.ifr_name, dev->if_name, sizeof ifr.ifr_name);
|
|
|
|
|
|
|
|
|
|
if (ioctl(dev->ctrl_sock, SIOCIFDESTROY, &ifr) == -1)
|
|
|
|
|
tuntap_log(TUNTAP_LOG_WARN, "Can't destroy the interface");
|
|
|
|
|
if(ioctl(dev->ctrl_sock, SIOCIFDESTROY, &ifr) == -1)
|
|
|
|
|
tuntap_log(TUNTAP_LOG_WARN, "Can't destroy the interface");
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
int
|
|
|
|
|
tuntap_sys_set_hwaddr(struct device *dev, struct ether_addr *eth_addr) {
|
|
|
|
|
struct ifaliasreq ifra;
|
|
|
|
|
|
|
|
|
|
(void)memset(&ifra, 0, sizeof ifra);
|
|
|
|
|
(void)memcpy(ifra.ifra_name, dev->if_name, sizeof dev->if_name);
|
|
|
|
|
ifra.ifra_addr.sa_len = ETHER_ADDR_LEN;
|
|
|
|
|
ifra.ifra_addr.sa_family = AF_LINK;
|
|
|
|
|
(void)memcpy(ifra.ifra_addr.sa_data, eth_addr, ETHER_ADDR_LEN);
|
|
|
|
|
|
|
|
|
|
if (ioctl(dev->ctrl_sock, SIOCSIFPHYADDR, &ifra) == -1) {
|
|
|
|
|
tuntap_log(TUNTAP_LOG_ERR, "Can't set link-layer address");
|
|
|
|
|
return -1;
|
|
|
|
|
}
|
|
|
|
|
return 0;
|
|
|
|
|
tuntap_sys_set_ipv4(struct device *dev, t_tun_in_addr *s, uint32_t bits)
|
|
|
|
|
{
|
|
|
|
|
struct ifaliasreq ifa;
|
|
|
|
|
struct ifreq ifr;
|
|
|
|
|
struct sockaddr_in mask;
|
|
|
|
|
struct sockaddr_in addr;
|
|
|
|
|
|
|
|
|
|
(void)memset(&ifa, '\0', sizeof ifa);
|
|
|
|
|
(void)strlcpy(ifa.ifra_name, dev->if_name, sizeof ifa.ifra_name);
|
|
|
|
|
|
|
|
|
|
(void)memset(&ifr, '\0', sizeof ifr);
|
|
|
|
|
(void)strlcpy(ifr.ifr_name, dev->if_name, sizeof ifr.ifr_name);
|
|
|
|
|
|
|
|
|
|
/* Delete previously assigned address */
|
|
|
|
|
(void)ioctl(dev->ctrl_sock, SIOCDIFADDR, &ifr);
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* Fill-in the destination address and netmask,
|
|
|
|
|
* but don't care of the broadcast address
|
|
|
|
|
*/
|
|
|
|
|
(void)memset(&addr, '\0', sizeof addr);
|
|
|
|
|
addr.sin_family = AF_INET;
|
|
|
|
|
addr.sin_addr.s_addr = s->s_addr;
|
|
|
|
|
addr.sin_len = sizeof addr;
|
|
|
|
|
(void)memcpy(&ifa.ifra_addr, &addr, sizeof addr);
|
|
|
|
|
|
|
|
|
|
(void)memset(&mask, '\0', sizeof mask);
|
|
|
|
|
mask.sin_family = AF_INET;
|
|
|
|
|
mask.sin_addr.s_addr = bits;
|
|
|
|
|
mask.sin_len = sizeof mask;
|
|
|
|
|
(void)memcpy(&ifa.ifra_mask, &mask, sizeof ifa.ifra_mask);
|
|
|
|
|
|
|
|
|
|
/* Simpler than calling SIOCSIFADDR and/or SIOCSIFBRDADDR */
|
|
|
|
|
if(ioctl(dev->ctrl_sock, SIOCAIFADDR, &ifa) == -1)
|
|
|
|
|
{
|
|
|
|
|
tuntap_log(TUNTAP_LOG_ERR, "Can't set IP/netmask");
|
|
|
|
|
return -1;
|
|
|
|
|
}
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
int
|
|
|
|
|
tuntap_sys_set_ipv4(struct device *dev, t_tun_in_addr *s, uint32_t bits) {
|
|
|
|
|
struct ifaliasreq ifa;
|
|
|
|
|
struct ifreq ifr;
|
|
|
|
|
struct sockaddr_in mask;
|
|
|
|
|
struct sockaddr_in addr;
|
|
|
|
|
|
|
|
|
|
(void)memset(&ifa, '\0', sizeof ifa);
|
|
|
|
|
(void)strlcpy(ifa.ifra_name, dev->if_name, sizeof ifa.ifra_name);
|
|
|
|
|
|
|
|
|
|
(void)memset(&ifr, '\0', sizeof ifr);
|
|
|
|
|
(void)strlcpy(ifr.ifr_name, dev->if_name, sizeof ifr.ifr_name);
|
|
|
|
|
|
|
|
|
|
/* Delete previously assigned address */
|
|
|
|
|
(void)ioctl(dev->ctrl_sock, SIOCDIFADDR, &ifr);
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* Fill-in the destination address and netmask,
|
|
|
|
|
* but don't care of the broadcast address
|
|
|
|
|
*/
|
|
|
|
|
(void)memset(&addr, '\0', sizeof addr);
|
|
|
|
|
addr.sin_family = AF_INET;
|
|
|
|
|
addr.sin_addr.s_addr = s->s_addr;
|
|
|
|
|
addr.sin_len = sizeof addr;
|
|
|
|
|
(void)memcpy(&ifa.ifra_addr, &addr, sizeof addr);
|
|
|
|
|
|
|
|
|
|
(void)memset(&mask, '\0', sizeof mask);
|
|
|
|
|
mask.sin_family = AF_INET;
|
|
|
|
|
mask.sin_addr.s_addr = bits;
|
|
|
|
|
mask.sin_len = sizeof mask;
|
|
|
|
|
(void)memcpy(&ifa.ifra_mask, &mask, sizeof ifa.ifra_mask);
|
|
|
|
|
|
|
|
|
|
/* Simpler than calling SIOCSIFADDR and/or SIOCSIFBRDADDR */
|
|
|
|
|
if (ioctl(dev->ctrl_sock, SIOCAIFADDR, &ifa) == -1) {
|
|
|
|
|
tuntap_log(TUNTAP_LOG_ERR, "Can't set IP/netmask");
|
|
|
|
|
return -1;
|
|
|
|
|
}
|
|
|
|
|
return 0;
|
|
|
|
|
tuntap_sys_set_descr(struct device *dev, const char *descr, size_t len)
|
|
|
|
|
{
|
|
|
|
|
tuntap_log(TUNTAP_LOG_NOTICE,
|
|
|
|
|
"Your system does not support tuntap_set_descr()");
|
|
|
|
|
return -1;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
int
|
|
|
|
|
tuntap_sys_set_descr(struct device *dev, const char *descr, size_t len) {
|
|
|
|
|
tuntap_log(TUNTAP_LOG_NOTICE,
|
|
|
|
|
"Your system does not support tuntap_set_descr()");
|
|
|
|
|
return -1;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
Ryan Tharp
6 years ago