VSOCK: add tools/testing/vsock/vsock_diag_test

F:	drivers/net/vsockmon.c

F:	drivers/vhost/vsock.c

F:	drivers/vhost/vsock.h

F:	tools/testing/vsock/

VIRTIO CONSOLE DRIVER

M:	Amit Shah <amit@kernel.org>

*.d

vsock_diag_test

all: test

test: vsock_diag_test

vsock_diag_test: vsock_diag_test.o timeout.o control.o

CFLAGS += -g -O2 -Werror -Wall -I. -I../../include/uapi -I../../include -Wno-pointer-sign -fno-strict-overflow -fno-strict-aliasing -fno-common -MMD -U_FORTIFY_SOURCE -D_GNU_SOURCE

.PHONY: all test clean

clean:

	${RM} *.o *.d vsock_diag_test

-include *.d

AF_VSOCK test suite

-------------------

These tests exercise net/vmw_vsock/ host<->guest sockets for VMware, KVM, and

Hyper-V.

The following tests are available:

  * vsock_diag_test - vsock_diag.ko module for listing open sockets

The following prerequisite steps are not automated and must be performed prior

to running tests:

1. Build the kernel and these tests.

2. Install the kernel and tests on the host.

3. Install the kernel and tests inside the guest.

4. Boot the guest and ensure that the AF_VSOCK transport is enabled.

Invoke test binaries in both directions as follows:

  # host=server, guest=client

  (host)# $TEST_BINARY --mode=server \

                       --control-port=1234 \

                       --peer-cid=3

  (guest)# $TEST_BINARY --mode=client \

                        --control-host=$HOST_IP \

                        --control-port=1234 \

                        --peer-cid=2

  # host=client, guest=server

  (guest)# $TEST_BINARY --mode=server \

                        --control-port=1234 \

                        --peer-cid=2

  (host)# $TEST_BINARY --mode=client \

                       --control-port=$GUEST_IP \

                       --control-port=1234 \

                       --peer-cid=3

/* Control socket for client/server test execution

 *

 * Copyright (C) 2017 Red Hat, Inc.

 *

 * Author: Stefan Hajnoczi <stefanha@redhat.com>

 *

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of the GNU General Public License

 * as published by the Free Software Foundation; version 2

 * of the License.

 */

/* The client and server may need to coordinate to avoid race conditions like

 * the client attempting to connect to a socket that the server is not

 * listening on yet.  The control socket offers a communications channel for

 * such coordination tasks.

 *

 * If the client calls control_expectln("LISTENING"), then it will block until

 * the server calls control_writeln("LISTENING").  This provides a simple

 * mechanism for coordinating between the client and the server.

 */

#include <errno.h>

#include <netdb.h>

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <unistd.h>

#include <sys/types.h>

#include <sys/socket.h>

#include "timeout.h"

#include "control.h"

static int control_fd = -1;

/* Open the control socket, either in server or client mode */

void control_init(const char *control_host,

		  const char *control_port,

		  bool server)

{

	struct addrinfo hints = {

		.ai_socktype = SOCK_STREAM,

	};

	struct addrinfo *result = NULL;

	struct addrinfo *ai;

	int ret;

	ret = getaddrinfo(control_host, control_port, &hints, &result);

	if (ret != 0) {

		fprintf(stderr, "%s\n", gai_strerror(ret));

		exit(EXIT_FAILURE);

	}

	for (ai = result; ai; ai = ai->ai_next) {

		int fd;

		int val = 1;

		fd = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);

		if (fd < 0)

			continue;

		if (!server) {

			if (connect(fd, ai->ai_addr, ai->ai_addrlen) < 0)

				goto next;

			control_fd = fd;

			printf("Control socket connected to %s:%s.\n",

			       control_host, control_port);

			break;

		}

		if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR,

			       &val, sizeof(val)) < 0) {

			perror("setsockopt");

			exit(EXIT_FAILURE);

		}

		if (bind(fd, ai->ai_addr, ai->ai_addrlen) < 0)

			goto next;

		if (listen(fd, 1) < 0)

			goto next;

		printf("Control socket listening on %s:%s\n",

		       control_host, control_port);

		fflush(stdout);

		control_fd = accept(fd, NULL, 0);

		close(fd);

		if (control_fd < 0) {

			perror("accept");

			exit(EXIT_FAILURE);

		}

		printf("Control socket connection accepted...\n");

		break;

next:

		close(fd);

	}

	if (control_fd < 0) {

		fprintf(stderr, "Control socket initialization failed.  Invalid address %s:%s?\n",

			control_host, control_port);

		exit(EXIT_FAILURE);

	}

	freeaddrinfo(result);

}

/* Free resources */

void control_cleanup(void)

{

	close(control_fd);

	control_fd = -1;

}

/* Write a line to the control socket */

void control_writeln(const char *str)

{

	ssize_t len = strlen(str);

	ssize_t ret;

	timeout_begin(TIMEOUT);

	do {

		ret = send(control_fd, str, len, MSG_MORE);

		timeout_check("send");

	} while (ret < 0 && errno == EINTR);

	if (ret != len) {

		perror("send");

		exit(EXIT_FAILURE);

	}

	do {

		ret = send(control_fd, "\n", 1, 0);

		timeout_check("send");

	} while (ret < 0 && errno == EINTR);

	if (ret != 1) {

		perror("send");

		exit(EXIT_FAILURE);

	}

	timeout_end();

}

/* Return the next line from the control socket (without the trailing newline).

 *

 * The program terminates if a timeout occurs.

 *

 * The caller must free() the returned string.

 */

char *control_readln(void)

{

	char *buf = NULL;

	size_t idx = 0;

	size_t buflen = 0;

	timeout_begin(TIMEOUT);

	for (;;) {

		ssize_t ret;

		if (idx >= buflen) {

			char *new_buf;

			new_buf = realloc(buf, buflen + 80);

			if (!new_buf) {

				perror("realloc");

				exit(EXIT_FAILURE);

			}

			buf = new_buf;

			buflen += 80;

		}

		do {

			ret = recv(control_fd, &buf[idx], 1, 0);

			timeout_check("recv");

		} while (ret < 0 && errno == EINTR);

		if (ret == 0) {

			fprintf(stderr, "unexpected EOF on control socket\n");

			exit(EXIT_FAILURE);

		}

		if (ret != 1) {

			perror("recv");

			exit(EXIT_FAILURE);

		}

		if (buf[idx] == '\n') {

			buf[idx] = '\0';

			break;

		}

		idx++;

	}

	timeout_end();

	return buf;

}

/* Wait until a given line is received or a timeout occurs */

void control_expectln(const char *str)

{

	char *line;

	line = control_readln();

	if (strcmp(str, line) != 0) {

		fprintf(stderr, "expected \"%s\" on control socket, got \"%s\"\n",

			str, line);

		exit(EXIT_FAILURE);

	}

	free(line);

}