mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-05 18:14:07 +08:00
b886d83c5b
Based on 1 normalized pattern(s): 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 315 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Armijn Hemel <armijn@tjaldur.nl> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190531190115.503150771@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
216 lines
4.2 KiB
C
216 lines
4.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/* Control socket for client/server test execution
|
|
*
|
|
* Copyright (C) 2017 Red Hat, Inc.
|
|
*
|
|
* Author: Stefan Hajnoczi <stefanha@redhat.com>
|
|
*/
|
|
|
|
/* 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);
|
|
}
|