42 lines
830 B
C
42 lines
830 B
C
#include <stdio.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <sys/ioctl.h>
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#include <sys/socket.h>
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#include <linux/if.h>
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#include <linux/if_tun.h>
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#include <string.h>
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int tap_alloc(char *dev)
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{
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struct ifreq ifr;
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int fd, err;
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if ((fd = open("/dev/net/tun", O_RDWR)) < 0) {
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perror("could not open /dev/net/tun");
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return -1;
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}
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memset(&ifr, 0, sizeof(ifr));
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/* Flags: IFF_TUN - TUN device (no Ethernet headers)
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* IFF_TAP - TAP device
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*
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* IFF_NO_PI - Do not provide packet information
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*/
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ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
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if (*dev)
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strncpy(ifr.ifr_name, dev, IFNAMSIZ);
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if ((err = ioctl(fd, TUNSETIFF, (void *)&ifr)) < 0) {
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perror("could not get tap device");
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close(fd);
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return err;
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}
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strcpy(dev, ifr.ifr_name);
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return fd;
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}
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