tap-test.c
tuexen (Michael Tuexen)
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	tuexen
	Apr 28 2019, 9:17 PM

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tap-test.c
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	#include <fcntl.h>
	#include <stdio.h>
	#include <stdlib.h>
	#include <unistd.h>

	int main(void)
	{
	#if 1
	ssize_t n;
	#endif
	int fd;
	char sbuf[] = {0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
	0xaa, 0xaa, 0xaa, 0xbb, 0x08, 0x00, 0x45, 0x00,
	0x00, 0x20, 0x00, 0x00, 0x00, 0x00, 0xff, 0x11,
	0x62, 0x3f, 0xac, 0x14, 0x00, 0xbb, 0xac, 0x14,
	0x00, 0xaa, 0x00, 0xbb, 0x00, 0xaa, 0x00, 0x0c,
	0x00, 0x00, 0x01, 0x02, 0x03, 0x04};
	char rbuf[1024];

	if ((fd = open("/dev/tap0", O_RDWR \| O_NONBLOCK)) < 0) {
	perror("open");
	}
	system("ifconfig tap0 ether aa:aa:aa:aa:aa:aa");
	system("ifconfig tap0 inet 172.20.0.170 netmask 255.255.255.0");
	system("ifconfig tap0 inet6 fe80::aa");
	system("arp -s 172.20.0.187 aa:aa:aa:aa:aa:bb");
	#if 1
	while ((n = read(fd, rbuf, sizeof(rbuf))) >= 0) {
	printf("Received packet of length %zd\n", n);
	sleep(1);
	}
	#endif
	sleep(1);
	if (write(fd, sbuf, sizeof(sbuf)) < 0) {
	perror("write");
	}
	#if 1
	while ((n = read(fd, rbuf, sizeof(rbuf))) >= 0) {
	printf("Received packet of length %zd\n", n);
	sleep(1);
	}
	#endif
	sleep(1);
	if (close(fd) < 0) {
	perror("close");
	}
	return (0);
	}