connect-with-dst-opt.c
tuexen (Michael Tuexen)
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	tuexen
	Sep 15 2019, 5:49 PM

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917 B

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connect-with-dst-opt.c
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	#include <sys/types.h>
	#include <sys/socket.h>
	#include <netinet/in.h>
	#include <arpa/inet.h>
	#include <stdlib.h>
	#include <string.h>
	#include <unistd.h>

	int
	main(void)
	{
	char opt[128];
	char buf[2048];
	struct sockaddr_in6 addr;
	int fd;

	opt[0] = IPPROTO_TCP;
	opt[1] = (sizeof(opt) >> 3) - 1;
	opt[2] = 0x3f;
	opt[3] = sizeof(opt) - 4;
	arc4random_buf(opt + 4, sizeof(opt) - 4);

	memset(buf, 'A', sizeof(buf));

	memset(&addr, 0, sizeof(addr));
	addr.sin6_family = AF_INET6;
	addr.sin6_len = sizeof(struct sockaddr_in6);
	addr.sin6_port = htons(80);
	inet_pton(AF_INET6, "2a02:c6a0:4015:10::108", &addr.sin6_addr);

	fd = socket(AF_INET6, SOCK_STREAM, IPPROTO_TCP);
	connect(fd, (const struct sockaddr *)&addr, (socklen_t)sizeof(struct sockaddr_in6));
	setsockopt(fd, IPPROTO_IPV6, IPV6_DSTOPTS, opt, (socklen_t)sizeof(opt));
	send(fd, (const void *)buf, sizeof(buf), 0);
	sleep(1);
	close(fd);
	return (0);
	}