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main.c
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main.c
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/* SPDX-License-Identifier: BSD-3-Clause */
/*
* Authors: Simon Kuenzer <[email protected]>
*
* Copyright (c) 2019, NEC Laboratories Europe GmbH, NEC Corporation.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the copyright holder nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <stdio.h>
#include <string.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <errno.h>
#define LISTEN_PORT 8123
static const char reply[] = "HTTP/1.1 200 OK\r\n" \
"Content-type: text/html\r\n" \
"Connection: close\r\n" \
"\r\n" \
"<!DOCTYPE HTML PUBLIC \"-//IETF//DTD HTML 2.0//EN\">" \
"<html>" \
"<head><title>It works!</title></head>" \
"<body><h1>It works!</h1><p>This is only a test.</p></body>" \
"</html>\n";
#define BUFLEN 2048
static char recvbuf[BUFLEN];
int main(int argc __attribute__((unused)),
char *argv[] __attribute__((unused)))
{
int rc = 0;
int srv, client;
ssize_t n;
struct sockaddr_in srv_addr;
srv = socket(AF_INET, SOCK_STREAM, 0);
if (srv < 0) {
fprintf(stderr, "Failed to create socket: %d\n", errno);
goto out;
}
srv_addr.sin_family = AF_INET;
srv_addr.sin_addr.s_addr = INADDR_ANY;
srv_addr.sin_port = htons(LISTEN_PORT);
rc = bind(srv, (struct sockaddr *) &srv_addr, sizeof(srv_addr));
if (rc < 0) {
fprintf(stderr, "Failed to bind socket: %d\n", errno);
goto out;
}
/* Accept one simultaneous connection */
rc = listen(srv, 1);
if (rc < 0) {
fprintf(stderr, "Failed to listen on socket: %d\n", errno);
goto out;
}
printf("Listening on port %d...\n", LISTEN_PORT);
while (1) {
client = accept(srv, NULL, 0);
if (client < 0) {
fprintf(stderr,
"Failed to accept incoming connection: %d\n",
errno);
goto out;
}
/* Receive some bytes (ignore errors) */
read(client, recvbuf, BUFLEN);
/* Send reply */
n = write(client, reply, sizeof(reply) - 1);
if (n < 0)
fprintf(stderr, "Failed to send a reply\n");
else
printf("Sent a reply\n");
/* Close connection */
close(client);
}
out:
return rc;
}