tools/testing/selftests/net/tls.c

// SPDX-License-Identifier: GPL-2.0

#define _GNU_SOURCE

#include <arpa/inet.h>
#include <errno.h>
#include <error.h>
#include <fcntl.h>
#include <poll.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

#include <linux/tls.h>
#include <linux/tcp.h>
#include <linux/socket.h>

#include <sys/types.h>
#include <sys/sendfile.h>
#include <sys/socket.h>
#include <sys/stat.h>

#include "../kselftest_harness.h"

#define TLS_PAYLOAD_MAX_LEN 16384
#define SOL_TLS 282

FIXTURE(tls)
{
	int fd, cfd;
	bool notls;
};

FIXTURE_SETUP(tls)
{
	struct tls12_crypto_info_aes_gcm_128 tls12;
	struct sockaddr_in addr;
	socklen_t len;
	int sfd, ret;

	self->notls = false;
	len = sizeof(addr);

	memset(&tls12, 0, sizeof(tls12));
	tls12.info.version = TLS_1_2_VERSION;
	tls12.info.cipher_type = TLS_CIPHER_AES_GCM_128;

	addr.sin_family = AF_INET;
	addr.sin_addr.s_addr = htonl(INADDR_ANY);
	addr.sin_port = 0;

	self->fd = socket(AF_INET, SOCK_STREAM, 0);
	sfd = socket(AF_INET, SOCK_STREAM, 0);

	ret = bind(sfd, &addr, sizeof(addr));
	ASSERT_EQ(ret, 0);
	ret = listen(sfd, 10);
	ASSERT_EQ(ret, 0);

	ret = getsockname(sfd, &addr, &len);
	ASSERT_EQ(ret, 0);

	ret = connect(self->fd, &addr, sizeof(addr));
	ASSERT_EQ(ret, 0);

	ret = setsockopt(self->fd, IPPROTO_TCP, TCP_ULP, "tls", sizeof("tls"));
	if (ret != 0) {
		self->notls = true;
		printf("Failure setting TCP_ULP, testing without tls\n");
	}

	if (!self->notls) {
		ret = setsockopt(self->fd, SOL_TLS, TLS_TX, &tls12,
				 sizeof(tls12));
		ASSERT_EQ(ret, 0);
	}

	self->cfd = accept(sfd, &addr, &len);
	ASSERT_GE(self->cfd, 0);

	if (!self->notls) {
		ret = setsockopt(self->cfd, IPPROTO_TCP, TCP_ULP, "tls",
				 sizeof("tls"));
		ASSERT_EQ(ret, 0);

		ret = setsockopt(self->cfd, SOL_TLS, TLS_RX, &tls12,
				 sizeof(tls12));
		ASSERT_EQ(ret, 0);
	}

	close(sfd);
}

FIXTURE_TEARDOWN(tls)
{
	close(self->fd);
	close(self->cfd);
}

TEST_F(tls, sendfile)
{
	int filefd = open("/proc/self/exe", O_RDONLY);
	struct stat st;

	EXPECT_GE(filefd, 0);
	fstat(filefd, &st);
	EXPECT_GE(sendfile(self->fd, filefd, 0, st.st_size), 0);
}

TEST_F(tls, send_then_sendfile)
{
	int filefd = open("/proc/self/exe", O_RDONLY);
	char const *test_str = "test_send";
	int to_send = strlen(test_str) + 1;
	char recv_buf[10];
	struct stat st;
	char *buf;

	EXPECT_GE(filefd, 0);
	fstat(filefd, &st);
	buf = (char *)malloc(st.st_size);

	EXPECT_EQ(send(self->fd, test_str, to_send, 0), to_send);
	EXPECT_EQ(recv(self->cfd, recv_buf, to_send, 0), to_send);
	EXPECT_EQ(memcmp(test_str, recv_buf, to_send), 0);

	EXPECT_GE(sendfile(self->fd, filefd, 0, st.st_size), 0);
	EXPECT_EQ(recv(self->cfd, buf, st.st_size, 0), st.st_size);
}

TEST_F(tls, recv_max)
{
	unsigned int send_len = TLS_PAYLOAD_MAX_LEN;
	char recv_mem[TLS_PAYLOAD_MAX_LEN];
	char buf[TLS_PAYLOAD_MAX_LEN];

	EXPECT_GE(send(self->fd, buf, send_len, 0), 0);
	EXPECT_NE(recv(self->cfd, recv_mem, send_len, 0), -1);
	EXPECT_EQ(memcmp(buf, recv_mem, send_len), 0);
}

TEST_F(tls, recv_small)
{
	char const *test_str = "test_read";
	int send_len = 10;
	char buf[10];

	send_len = strlen(test_str) + 1;
	EXPECT_EQ(send(self->fd, test_str, send_len, 0), send_len);
	EXPECT_NE(recv(self->cfd, buf, send_len, 0), -1);
	EXPECT_EQ(memcmp(buf, test_str, send_len), 0);
}

TEST_F(tls, msg_more)
{
	char const *test_str = "test_read";
	int send_len = 10;
	char buf[10 * 2];

	EXPECT_EQ(send(self->fd, test_str, send_len, MSG_MORE), send_len);
	EXPECT_EQ(recv(self->cfd, buf, send_len, MSG_DONTWAIT), -1);
	EXPECT_EQ(send(self->fd, test_str, send_len, 0), send_len);
	EXPECT_EQ(recv(self->cfd, buf, send_len * 2, MSG_DONTWAIT),
		  send_len * 2);
	EXPECT_EQ(memcmp(buf, test_str, send_len), 0);
}

TEST_F(tls, sendmsg_single)
{
	struct msghdr msg;

	char const *test_str = "test_sendmsg";
	size_t send_len = 13;
	struct iovec vec;
	char buf[13];

	vec.iov_base = (char *)test_str;
	vec.iov_len = send_len;
	memset(&msg, 0, sizeof(struct msghdr));
	msg.msg_iov = &vec;
	msg.msg_iovlen = 1;
	EXPECT_EQ(sendmsg(self->fd, &msg, 0), send_len);
	EXPECT_EQ(recv(self->cfd, buf, send_len, 0), send_len);
	EXPECT_EQ(memcmp(buf, test_str, send_len), 0);
}

TEST_F(tls, sendmsg_large)
{
	void *mem = malloc(16384);
	size_t send_len = 16384;
	size_t sends = 128;
	struct msghdr msg;
	size_t recvs = 0;
	size_t sent = 0;

	memset(&msg, 0, sizeof(struct msghdr));
	while (sent++ < sends) {
		struct iovec vec = { (void *)mem, send_len };

		msg.msg_iov = &vec;
		msg.msg_iovlen = 1;
		EXPECT_EQ(sendmsg(self->cfd, &msg, 0), send_len);
	}

	while (recvs++ < sends)
		EXPECT_NE(recv(self->fd, mem, send_len, 0), -1);

	free(mem);
}

TEST_F(tls, sendmsg_multiple)
{
	char const *test_str = "test_sendmsg_multiple";
	struct iovec vec[5];
	char *test_strs[5];
	struct msghdr msg;
	int total_len = 0;
	int len_cmp = 0;
	int iov_len = 5;
	char *buf;
	int i;

	memset(&msg, 0, sizeof(struct msghdr));
	for (i = 0; i < iov_len; i++) {
		test_strs[i] = (char *)malloc(strlen(test_str) + 1);
		snprintf(test_strs[i], strlen(test_str) + 1, "%s", test_str);
		vec[i].iov_base = (void *)test_strs[i];
		vec[i].iov_len = strlen(test_strs[i]) + 1;
		total_len += vec[i].iov_len;
	}
	msg.msg_iov = vec;
	msg.msg_iovlen = iov_len;

	EXPECT_EQ(sendmsg(self->cfd, &msg, 0), total_len);
	buf = malloc(total_len);
	EXPECT_NE(recv(self->fd, buf, total_len, 0), -1);
	for (i = 0; i < iov_len; i++) {
		EXPECT_EQ(memcmp(test_strs[i], buf + len_cmp,
				 strlen(test_strs[i])),
			  0);
		len_cmp += strlen(buf + len_cmp) + 1;
	}
	for (i = 0; i < iov_len; i++)
		free(test_strs[i]);
	free(buf);
}

TEST_F(tls, sendmsg_multiple_stress)
{
	char const *test_str = "abcdefghijklmno";
	struct iovec vec[1024];
	char *test_strs[1024];
	int iov_len = 1024;
	int total_len = 0;
	char buf[1 << 14];
	struct msghdr msg;
	int len_cmp = 0;
	int i;

	memset(&msg, 0, sizeof(struct msghdr));
	for (i = 0; i < iov_len; i++) {
		test_strs[i] = (char *)malloc(strlen(test_str) + 1);
		snprintf(test_strs[i], strlen(test_str) + 1, "%s", test_str);
		vec[i].iov_base = (void *)test_strs[i];
		vec[i].iov_len = strlen(test_strs[i]) + 1;
		total_len += vec[i].iov_len;
	}
	msg.msg_iov = vec;
	msg.msg_iovlen = iov_len;

	EXPECT_EQ(sendmsg(self->fd, &msg, 0), total_len);
	EXPECT_NE(recv(self->cfd, buf, total_len, 0), -1);

	for (i = 0; i < iov_len; i++)
		len_cmp += strlen(buf + len_cmp) + 1;

	for (i = 0; i < iov_len; i++)
		free(test_strs[i]);
}

TEST_F(tls, splice_from_pipe)
{
	int send_len = TLS_PAYLOAD_MAX_LEN;
	char mem_send[TLS_PAYLOAD_MAX_LEN];
	char mem_recv[TLS_PAYLOAD_MAX_LEN];
	int p[2];

	ASSERT_GE(pipe(p), 0);
	EXPECT_GE(write(p[1], mem_send, send_len), 0);
	EXPECT_GE(splice(p[0], NULL, self->fd, NULL, send_len, 0), 0);
	EXPECT_EQ(recv(self->cfd, mem_recv, send_len, MSG_WAITALL), send_len);
	EXPECT_EQ(memcmp(mem_send, mem_recv, send_len), 0);
}

TEST_F(tls, splice_from_pipe2)
{
	int send_len = 16000;
	char mem_send[16000];
	char mem_recv[16000];
	int p2[2];
	int p[2];

	ASSERT_GE(pipe(p), 0);
	ASSERT_GE(pipe(p2), 0);
	EXPECT_GE(write(p[1], mem_send, 8000), 0);
	EXPECT_GE(splice(p[0], NULL, self->fd, NULL, 8000, 0), 0);
	EXPECT_GE(write(p2[1], mem_send + 8000, 8000), 0);
	EXPECT_GE(splice(p2[0], NULL, self->fd, NULL, 8000, 0), 0);
	EXPECT_GE(recv(self->cfd, mem_recv, send_len, 0), 0);
	EXPECT_EQ(memcmp(mem_send, mem_recv, send_len), 0);
}

TEST_F(tls, send_and_splice)
{
	int send_len = TLS_PAYLOAD_MAX_LEN;
	char mem_send[TLS_PAYLOAD_MAX_LEN];
	char mem_recv[TLS_PAYLOAD_MAX_LEN];
	char const *test_str = "test_read";
	int send_len2 = 10;
	char buf[10];
	int p[2];

	ASSERT_GE(pipe(p), 0);
	EXPECT_EQ(send(self->fd, test_str, send_len2, 0), send_len2);
	EXPECT_EQ(recv(self->cfd, buf, send_len2, MSG_WAITALL), send_len2);
	EXPECT_EQ(memcmp(test_str, buf, send_len2), 0);

	EXPECT_GE(write(p[1], mem_send, send_len), send_len);
	EXPECT_GE(splice(p[0], NULL, self->fd, NULL, send_len, 0), send_len);

	EXPECT_EQ(recv(self->cfd, mem_recv, send_len, MSG_WAITALL), send_len);
	EXPECT_EQ(memcmp(mem_send, mem_recv, send_len), 0);
}

TEST_F(tls, splice_to_pipe)
{
	int send_len = TLS_PAYLOAD_MAX_LEN;
	char mem_send[TLS_PAYLOAD_MAX_LEN];
	char mem_recv[TLS_PAYLOAD_MAX_LEN];
	int p[2];

	ASSERT_GE(pipe(p), 0);
	EXPECT_GE(send(self->fd, mem_send, send_len, 0), 0);
	EXPECT_GE(splice(self->cfd, NULL, p[1], NULL, send_len, 0), 0);
	EXPECT_GE(read(p[0], mem_recv, send_len), 0);
	EXPECT_EQ(memcmp(mem_send, mem_recv, send_len), 0);
}

TEST_F(tls, recvmsg_single)
{
	char const *test_str = "test_recvmsg_single";
	int send_len = strlen(test_str) + 1;
	char buf[20];
	struct msghdr hdr;
	struct iovec vec;

	memset(&hdr, 0, sizeof(hdr));
	EXPECT_EQ(send(self->fd, test_str, send_len, 0), send_len);
	vec.iov_base = (char *)buf;
	vec.iov_len = send_len;
	hdr.msg_iovlen = 1;
	hdr.msg_iov = &vec;
	EXPECT_NE(recvmsg(self->cfd, &hdr, 0), -1);
	EXPECT_EQ(memcmp(test_str, buf, send_len), 0);
}

TEST_F(tls, recvmsg_single_max)
{
	int send_len = TLS_PAYLOAD_MAX_LEN;
	char send_mem[TLS_PAYLOAD_MAX_LEN];
	char recv_mem[TLS_PAYLOAD_MAX_LEN];
	struct iovec vec;
	struct msghdr hdr;

	EXPECT_EQ(send(self->fd, send_mem, send_len, 0), send_len);
	vec.iov_base = (char *)recv_mem;
	vec.iov_len = TLS_PAYLOAD_MAX_LEN;

	hdr.msg_iovlen = 1;
	hdr.msg_iov = &vec;
	EXPECT_NE(recvmsg(self->cfd, &hdr, 0), -1);
	EXPECT_EQ(memcmp(send_mem, recv_mem, send_len), 0);
}

TEST_F(tls, recvmsg_multiple)
{
	unsigned int msg_iovlen = 1024;
	unsigned int len_compared = 0;
	struct iovec vec[1024];
	char *iov_base[1024];
	unsigned int iov_len = 16;
	int send_len = 1 << 14;
	char buf[1 << 14];
	struct msghdr hdr;
	int i;

	EXPECT_EQ(send(self->fd, buf, send_len, 0), send_len);
	for (i = 0; i < msg_iovlen; i++) {
		iov_base[i] = (char *)malloc(iov_len);
		vec[i].iov_base = iov_base[i];
		vec[i].iov_len = iov_len;
	}

	hdr.msg_iovlen = msg_iovlen;
	hdr.msg_iov = vec;
	EXPECT_NE(recvmsg(self->cfd, &hdr, 0), -1);
	for (i = 0; i < msg_iovlen; i++)
		len_compared += iov_len;

	for (i = 0; i < msg_iovlen; i++)
		free(iov_base[i]);
}

TEST_F(tls, single_send_multiple_recv)
{
	unsigned int total_len = TLS_PAYLOAD_MAX_LEN * 2;
	unsigned int send_len = TLS_PAYLOAD_MAX_LEN;
	char send_mem[TLS_PAYLOAD_MAX_LEN * 2];
	char recv_mem[TLS_PAYLOAD_MAX_LEN * 2];

	EXPECT_GE(send(self->fd, send_mem, total_len, 0), 0);
	memset(recv_mem, 0, total_len);

	EXPECT_NE(recv(self->cfd, recv_mem, send_len, 0), -1);
	EXPECT_NE(recv(self->cfd, recv_mem + send_len, send_len, 0), -1);
	EXPECT_EQ(memcmp(send_mem, recv_mem, total_len), 0);
}

TEST_F(tls, multiple_send_single_recv)
{
	unsigned int total_len = 2 * 10;
	unsigned int send_len = 10;
	char recv_mem[2 * 10];
	char send_mem[10];

	EXPECT_GE(send(self->fd, send_mem, send_len, 0), 0);
	EXPECT_GE(send(self->fd, send_mem, send_len, 0), 0);
	memset(recv_mem, 0, total_len);
	EXPECT_EQ(recv(self->cfd, recv_mem, total_len, 0), total_len);

	EXPECT_EQ(memcmp(send_mem, recv_mem, send_len), 0);
	EXPECT_EQ(memcmp(send_mem, recv_mem + send_len, send_len), 0);
}

TEST_F(tls, recv_partial)
{
	char const *test_str = "test_read_partial";
	char const *test_str_first = "test_read";
	char const *test_str_second = "_partial";
	int send_len = strlen(test_str) + 1;
	char recv_mem[18];

	memset(recv_mem, 0, sizeof(recv_mem));
	EXPECT_EQ(send(self->fd, test_str, send_len, 0), send_len);
	EXPECT_NE(recv(self->cfd, recv_mem, strlen(test_str_first), 0), -1);
	EXPECT_EQ(memcmp(test_str_first, recv_mem, strlen(test_str_first)), 0);
	memset(recv_mem, 0, sizeof(recv_mem));
	EXPECT_NE(recv(self->cfd, recv_mem, strlen(test_str_second), 0), -1);
	EXPECT_EQ(memcmp(test_str_second, recv_mem, strlen(test_str_second)),
		  0);
}

TEST_F(tls, recv_nonblock)
{
	char buf[4096];
	bool err;

	EXPECT_EQ(recv(self->cfd, buf, sizeof(buf), MSG_DONTWAIT), -1);
	err = (errno == EAGAIN || errno == EWOULDBLOCK);
	EXPECT_EQ(err, true);
}

TEST_F(tls, recv_peek)
{
	char const *test_str = "test_read_peek";
	int send_len = strlen(test_str) + 1;
	char buf[15];

	EXPECT_EQ(send(self->fd, test_str, send_len, 0), send_len);
	EXPECT_NE(recv(self->cfd, buf, send_len, MSG_PEEK), -1);
	EXPECT_EQ(memcmp(test_str, buf, send_len), 0);
	memset(buf, 0, sizeof(buf));
	EXPECT_NE(recv(self->cfd, buf, send_len, 0), -1);
	EXPECT_EQ(memcmp(test_str, buf, send_len), 0);
}

TEST_F(tls, recv_peek_multiple)
{
	char const *test_str = "test_read_peek";
	int send_len = strlen(test_str) + 1;
	unsigned int num_peeks = 100;
	char buf[15];
	int i;

	EXPECT_EQ(send(self->fd, test_str, send_len, 0), send_len);
	for (i = 0; i < num_peeks; i++) {
		EXPECT_NE(recv(self->cfd, buf, send_len, MSG_PEEK), -1);
		EXPECT_EQ(memcmp(test_str, buf, send_len), 0);
		memset(buf, 0, sizeof(buf));
	}
	EXPECT_NE(recv(self->cfd, buf, send_len, 0), -1);
	EXPECT_EQ(memcmp(test_str, buf, send_len), 0);
}

TEST_F(tls, recv_peek_multiple_records)
{
	char const *test_str = "test_read_peek_mult_recs";
	char const *test_str_first = "test_read_peek";
	char const *test_str_second = "_mult_recs";
	int len;
	char buf[64];

	len = strlen(test_str_first);
	EXPECT_EQ(send(self->fd, test_str_first, len, 0), len);

	len = strlen(test_str_second) + 1;
	EXPECT_EQ(send(self->fd, test_str_second, len, 0), len);

	len = strlen(test_str_first);
	memset(buf, 0, len);
	EXPECT_EQ(recv(self->cfd, buf, len, MSG_PEEK | MSG_WAITALL), len);

	/* MSG_PEEK can only peek into the current record. */
	len = strlen(test_str_first);
	EXPECT_EQ(memcmp(test_str_first, buf, len), 0);

	len = strlen(test_str) + 1;
	memset(buf, 0, len);
	EXPECT_EQ(recv(self->cfd, buf, len, MSG_WAITALL), len);

	/* Non-MSG_PEEK will advance strparser (and therefore record)
	 * however.
	 */
	len = strlen(test_str) + 1;
	EXPECT_EQ(memcmp(test_str, buf, len), 0);

	/* MSG_MORE will hold current record open, so later MSG_PEEK
	 * will see everything.
	 */
	len = strlen(test_str_first);
	EXPECT_EQ(send(self->fd, test_str_first, len, MSG_MORE), len);

	len = strlen(test_str_second) + 1;
	EXPECT_EQ(send(self->fd, test_str_second, len, 0), len);

	len = strlen(test_str) + 1;
	memset(buf, 0, len);
	EXPECT_EQ(recv(self->cfd, buf, len, MSG_PEEK | MSG_WAITALL), len);

	len = strlen(test_str) + 1;
	EXPECT_EQ(memcmp(test_str, buf, len), 0);
}

TEST_F(tls, pollin)
{
	char const *test_str = "test_poll";
	struct pollfd fd = { 0, 0, 0 };
	char buf[10];
	int send_len = 10;

	EXPECT_EQ(send(self->fd, test_str, send_len, 0), send_len);
	fd.fd = self->cfd;
	fd.events = POLLIN;

	EXPECT_EQ(poll(&fd, 1, 20), 1);
	EXPECT_EQ(fd.revents & POLLIN, 1);
	EXPECT_EQ(recv(self->cfd, buf, send_len, 0), send_len);
	/* Test timing out */
	EXPECT_EQ(poll(&fd, 1, 20), 0);
}

TEST_F(tls, poll_wait)
{
	char const *test_str = "test_poll_wait";
	int send_len = strlen(test_str) + 1;
	struct pollfd fd = { 0, 0, 0 };
	char recv_mem[15];

	fd.fd = self->cfd;
	fd.events = POLLIN;
	EXPECT_EQ(send(self->fd, test_str, send_len, 0), send_len);
	/* Set timeout to inf. secs */
	EXPECT_EQ(poll(&fd, 1, -1), 1);
	EXPECT_EQ(fd.revents & POLLIN, 1);
	EXPECT_EQ(recv(self->cfd, recv_mem, send_len, 0), send_len);
}

TEST_F(tls, blocking)
{
	size_t data = 100000;
	int res = fork();

	EXPECT_NE(res, -1);

	if (res) {
		/* parent */
		size_t left = data;
		char buf[16384];
		int status;
		int pid2;

		while (left) {
			int res = send(self->fd, buf,
				       left > 16384 ? 16384 : left, 0);

			EXPECT_GE(res, 0);
			left -= res;
		}

		pid2 = wait(&status);
		EXPECT_EQ(status, 0);
		EXPECT_EQ(res, pid2);
	} else {
		/* child */
		size_t left = data;
		char buf[16384];

		while (left) {
			int res = recv(self->cfd, buf,
				       left > 16384 ? 16384 : left, 0);

			EXPECT_GE(res, 0);
			left -= res;
		}
	}
}

TEST_F(tls, nonblocking)
{
	size_t data = 100000;
	int sendbuf = 100;
	int flags;
	int res;

	flags = fcntl(self->fd, F_GETFL, 0);
	fcntl(self->fd, F_SETFL, flags | O_NONBLOCK);
	fcntl(self->cfd, F_SETFL, flags | O_NONBLOCK);

	/* Ensure nonblocking behavior by imposing a small send
	 * buffer.
	 */
	EXPECT_EQ(setsockopt(self->fd, SOL_SOCKET, SO_SNDBUF,
			     &sendbuf, sizeof(sendbuf)), 0);

	res = fork();
	EXPECT_NE(res, -1);

	if (res) {
		/* parent */
		bool eagain = false;
		size_t left = data;
		char buf[16384];
		int status;
		int pid2;

		while (left) {
			int res = send(self->fd, buf,
				       left > 16384 ? 16384 : left, 0);

			if (res == -1 && errno == EAGAIN) {
				eagain = true;
				usleep(10000);
				continue;
			}
			EXPECT_GE(res, 0);
			left -= res;
		}

		EXPECT_TRUE(eagain);
		pid2 = wait(&status);

		EXPECT_EQ(status, 0);
		EXPECT_EQ(res, pid2);
	} else {
		/* child */
		bool eagain = false;
		size_t left = data;
		char buf[16384];

		while (left) {
			int res = recv(self->cfd, buf,
				       left > 16384 ? 16384 : left, 0);

			if (res == -1 && errno == EAGAIN) {
				eagain = true;
				usleep(10000);
				continue;
			}
			EXPECT_GE(res, 0);
			left -= res;
		}
		EXPECT_TRUE(eagain);
	}
}

TEST_F(tls, control_msg)
{
	if (self->notls)
		return;

	char cbuf[CMSG_SPACE(sizeof(char))];
	char const *test_str = "test_read";
	int cmsg_len = sizeof(char);
	char record_type = 100;
	struct cmsghdr *cmsg;
	struct msghdr msg;
	int send_len = 10;
	struct iovec vec;
	char buf[10];

	vec.iov_base = (char *)test_str;
	vec.iov_len = 10;
	memset(&msg, 0, sizeof(struct msghdr));
	msg.msg_iov = &vec;
	msg.msg_iovlen = 1;
	msg.msg_control = cbuf;
	msg.msg_controllen = sizeof(cbuf);
	cmsg = CMSG_FIRSTHDR(&msg);
	cmsg->cmsg_level = SOL_TLS;
	/* test sending non-record types. */
	cmsg->cmsg_type = TLS_SET_RECORD_TYPE;
	cmsg->cmsg_len = CMSG_LEN(cmsg_len);
	*CMSG_DATA(cmsg) = record_type;
	msg.msg_controllen = cmsg->cmsg_len;

	EXPECT_EQ(sendmsg(self->fd, &msg, 0), send_len);
	/* Should fail because we didn't provide a control message */
	EXPECT_EQ(recv(self->cfd, buf, send_len, 0), -1);

	vec.iov_base = buf;
	EXPECT_EQ(recvmsg(self->cfd, &msg, 0), send_len);
	cmsg = CMSG_FIRSTHDR(&msg);
	EXPECT_NE(cmsg, NULL);
	EXPECT_EQ(cmsg->cmsg_level, SOL_TLS);
	EXPECT_EQ(cmsg->cmsg_type, TLS_GET_RECORD_TYPE);
	record_type = *((unsigned char *)CMSG_DATA(cmsg));
	EXPECT_EQ(record_type, 100);
	EXPECT_EQ(memcmp(buf, test_str, send_len), 0);
}

TEST_HARNESS_MAIN