nuttx-apps/examples/udp/udp_server.c
Alin Jerpelea 6bc7a448de examples: author: Gregory Nutt: update licenses to Apache
Gregory Nutt is has submitted the SGA

as a result we can migrate the licenses to Apache.

Signed-off-by: Alin Jerpelea <alin.jerpelea@sony.com>
2021-06-15 05:16:58 -05:00

215 lines
6.1 KiB
C

/****************************************************************************
* examples/udp/udp_server.c
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include "config.h"
#include <sys/socket.h>
#include <netinet/in.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <arpa/inet.h>
#include "udp.h"
/****************************************************************************
* Private Functions
****************************************************************************/
static inline int check_buffer(unsigned char *buf)
{
int ret = 1;
int offset;
int ch;
int j;
offset = buf[0];
for (ch = 0x20, j = offset + 1; ch < 0x7f; ch++, j++)
{
if (j >= SENDSIZE)
{
j = 1;
}
if (buf[j] != ch)
{
printf("server: Buffer content error for offset=%d, index=%d\n",
offset, j);
ret = 0;
}
}
return ret;
}
/****************************************************************************
* Public Functions
****************************************************************************/
void udp_server(void)
{
#ifdef CONFIG_EXAMPLES_UDP_IPv6
struct sockaddr_in6 server;
struct sockaddr_in6 client;
#else
struct sockaddr_in server;
struct sockaddr_in client;
in_addr_t tmpaddr;
#endif
unsigned char inbuf[1024];
socklen_t addrlen;
socklen_t recvlen;
int sockfd;
int nbytes;
int optval;
int offset;
#ifdef CONFIG_EXAMPLES_UDP_BROADCAST
int ret;
#endif
/* Create a new UDP socket */
sockfd = socket(PF_INETX, SOCK_DGRAM, 0);
if (sockfd < 0)
{
printf("server: socket failure: %d\n", errno);
exit(1);
}
/* Set socket to reuse address */
optval = 1;
if (setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, (void *)&optval,
sizeof(int)) < 0)
{
printf("server: setsockopt SO_REUSEADDR failure: %d\n", errno);
exit(1);
}
#ifdef CONFIG_EXAMPLES_UDP_BROADCAST
optval = 1;
ret = setsockopt(sockfd, SOL_SOCKET, SO_BROADCAST, &optval, sizeof(int));
if (ret < 0)
{
printf("Failed to set SO_BROADCAST\n");
exit(1);
}
#endif
/* Bind the socket to a local address */
#ifdef CONFIG_EXAMPLES_UDP_IPv6
server.sin6_family = AF_INET6;
server.sin6_port = HTONS(CONFIG_EXAMPLES_UDP_SERVER_PORTNO);
memset(&server.sin6_addr, 0, sizeof(struct in6_addr));
addrlen = sizeof(struct sockaddr_in6);
#else
server.sin_family = AF_INET;
server.sin_port = HTONS(CONFIG_EXAMPLES_UDP_SERVER_PORTNO);
server.sin_addr.s_addr = HTONL(INADDR_ANY);
addrlen = sizeof(struct sockaddr_in);
#endif
if (bind(sockfd, (struct sockaddr *)&server, addrlen) < 0)
{
printf("server: bind failure: %d\n", errno);
exit(1);
}
/* Then receive up to 256 packets of data */
for (offset = 0; offset < 256; offset++)
{
printf("server: %d. Receiving up 1024 bytes\n", offset);
recvlen = addrlen;
nbytes = recvfrom(sockfd, inbuf, 1024, 0,
(struct sockaddr *)&client, &recvlen);
#ifdef CONFIG_EXAMPLES_UDP_IPv6
printf("server: %d. Received %d bytes from "
"%02x%02x:%02x%02x:%02x%02x:%02x%02x:"
"%02x%02x:%02x%02x:%02x%02x:%02x%02x port %d\n",
offset, nbytes,
client.sin6_addr.s6_addr[0], client.sin6_addr.s6_addr[1],
client.sin6_addr.s6_addr[2], client.sin6_addr.s6_addr[3],
client.sin6_addr.s6_addr[4], client.sin6_addr.s6_addr[5],
client.sin6_addr.s6_addr[6], client.sin6_addr.s6_addr[7],
client.sin6_addr.s6_addr[8], client.sin6_addr.s6_addr[9],
client.sin6_addr.s6_addr[10], client.sin6_addr.s6_addr[11],
client.sin6_addr.s6_addr[12], client.sin6_addr.s6_addr[13],
client.sin6_addr.s6_addr[14], client.sin6_addr.s6_addr[15],
ntohs(client.sin6_port));
#else
tmpaddr = ntohl(client.sin_addr.s_addr);
printf("server: %d. Received %d bytes from %d.%d.%d.%d:%d\n",
offset, nbytes,
tmpaddr >> 24, (tmpaddr >> 16) & 0xff,
(tmpaddr >> 8) & 0xff, tmpaddr & 0xff,
ntohs(client.sin_port));
#endif
if (nbytes < 0)
{
printf("server: %d. recv failed: %d\n", offset, errno);
close(sockfd);
exit(-1);
}
if (nbytes != SENDSIZE)
{
printf("server: %d. recv size incorrect: %d vs %d\n", offset,
nbytes, SENDSIZE);
close(sockfd);
exit(-1);
}
if (offset < inbuf[0])
{
printf("server: %d. %d packets lost, resetting offset\n", offset,
inbuf[0] - offset);
offset = inbuf[0];
}
else if (offset > inbuf[0])
{
printf("server: %d. Bad offset in buffer: %d\n", offset, inbuf[0]);
close(sockfd);
exit(-1);
}
if (!check_buffer(inbuf))
{
printf("server: %d. Bad buffer contents\n", offset);
close(sockfd);
exit(-1);
}
}
close(sockfd);
}