VSOCK: add tools/testing/vsock/vsock_diag_test
This patch adds tests for the vsock_diag.ko module. These tests are not self-tests because they require manual set up of a KVM or VMware guest. Please see tools/testing/vsock/README for instructions. The control.h and timeout.h infrastructure can be used for additional AF_VSOCK tests in the future. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Stefan Hajnoczi
committed by
David S. Miller
David S. Miller
parent
413a4317ac
commit
0b02503384
219
tools/testing/vsock/control.c
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219
tools/testing/vsock/control.c
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/* Control socket for client/server test execution
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*
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* Copyright (C) 2017 Red Hat, Inc.
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*
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* Author: Stefan Hajnoczi <stefanha@redhat.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; version 2
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* of the License.
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*/
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/* The client and server may need to coordinate to avoid race conditions like
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* the client attempting to connect to a socket that the server is not
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* listening on yet. The control socket offers a communications channel for
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* such coordination tasks.
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*
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* If the client calls control_expectln("LISTENING"), then it will block until
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* the server calls control_writeln("LISTENING"). This provides a simple
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* mechanism for coordinating between the client and the server.
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*/
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#include <errno.h>
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#include <netdb.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include "timeout.h"
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#include "control.h"
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static int control_fd = -1;
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/* Open the control socket, either in server or client mode */
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void control_init(const char *control_host,
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const char *control_port,
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bool server)
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{
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struct addrinfo hints = {
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.ai_socktype = SOCK_STREAM,
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};
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struct addrinfo *result = NULL;
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struct addrinfo *ai;
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int ret;
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ret = getaddrinfo(control_host, control_port, &hints, &result);
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if (ret != 0) {
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fprintf(stderr, "%s\n", gai_strerror(ret));
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exit(EXIT_FAILURE);
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}
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for (ai = result; ai; ai = ai->ai_next) {
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int fd;
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int val = 1;
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fd = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
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if (fd < 0)
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continue;
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if (!server) {
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if (connect(fd, ai->ai_addr, ai->ai_addrlen) < 0)
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goto next;
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control_fd = fd;
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printf("Control socket connected to %s:%s.\n",
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control_host, control_port);
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break;
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}
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if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR,
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&val, sizeof(val)) < 0) {
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perror("setsockopt");
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exit(EXIT_FAILURE);
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}
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if (bind(fd, ai->ai_addr, ai->ai_addrlen) < 0)
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goto next;
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if (listen(fd, 1) < 0)
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goto next;
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printf("Control socket listening on %s:%s\n",
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control_host, control_port);
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fflush(stdout);
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control_fd = accept(fd, NULL, 0);
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close(fd);
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if (control_fd < 0) {
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perror("accept");
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exit(EXIT_FAILURE);
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}
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printf("Control socket connection accepted...\n");
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break;
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next:
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close(fd);
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}
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if (control_fd < 0) {
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fprintf(stderr, "Control socket initialization failed. Invalid address %s:%s?\n",
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control_host, control_port);
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exit(EXIT_FAILURE);
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}
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freeaddrinfo(result);
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}
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/* Free resources */
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void control_cleanup(void)
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{
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close(control_fd);
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control_fd = -1;
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}
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/* Write a line to the control socket */
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void control_writeln(const char *str)
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{
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ssize_t len = strlen(str);
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ssize_t ret;
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timeout_begin(TIMEOUT);
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do {
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ret = send(control_fd, str, len, MSG_MORE);
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timeout_check("send");
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} while (ret < 0 && errno == EINTR);
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if (ret != len) {
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perror("send");
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exit(EXIT_FAILURE);
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}
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do {
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ret = send(control_fd, "\n", 1, 0);
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timeout_check("send");
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} while (ret < 0 && errno == EINTR);
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if (ret != 1) {
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perror("send");
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exit(EXIT_FAILURE);
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}
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timeout_end();
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}
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/* Return the next line from the control socket (without the trailing newline).
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*
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* The program terminates if a timeout occurs.
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*
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* The caller must free() the returned string.
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*/
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char *control_readln(void)
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{
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char *buf = NULL;
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size_t idx = 0;
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size_t buflen = 0;
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timeout_begin(TIMEOUT);
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for (;;) {
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ssize_t ret;
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if (idx >= buflen) {
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char *new_buf;
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new_buf = realloc(buf, buflen + 80);
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if (!new_buf) {
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perror("realloc");
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exit(EXIT_FAILURE);
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}
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buf = new_buf;
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buflen += 80;
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}
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do {
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ret = recv(control_fd, &buf[idx], 1, 0);
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timeout_check("recv");
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} while (ret < 0 && errno == EINTR);
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if (ret == 0) {
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fprintf(stderr, "unexpected EOF on control socket\n");
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exit(EXIT_FAILURE);
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}
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if (ret != 1) {
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perror("recv");
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exit(EXIT_FAILURE);
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}
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if (buf[idx] == '\n') {
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buf[idx] = '\0';
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break;
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}
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idx++;
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}
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timeout_end();
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return buf;
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}
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/* Wait until a given line is received or a timeout occurs */
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void control_expectln(const char *str)
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{
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char *line;
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line = control_readln();
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if (strcmp(str, line) != 0) {
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fprintf(stderr, "expected \"%s\" on control socket, got \"%s\"\n",
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str, line);
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exit(EXIT_FAILURE);
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}
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free(line);
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}
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