/*********************************************************************************
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* Copyright: (C) 2018 LingYun IoT Studio
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* All rights reserved.
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*
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* Filename: socket_server.c
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* Description: This file is UDP socket server example source code.
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*
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* Version: 1.0.0(10/23/2018)
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* Author: Guo Wenxue <guowenxue@gmail.com>
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* ChangeLog: 1, Release initial version on "2017-10-23 01:41:05 PM"
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*
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********************************************************************************/
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#include <stdio.h>
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#include <string.h>
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#include <errno.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 <netinet/in.h>
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#include <arpa/inet.h>
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#define LISTEN_PORT 8890
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#define BACKLOG 13
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int main(int argc, char **argv)
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{
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int rv = -1;
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int sockfd;
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struct sockaddr_in serv_addr;
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struct sockaddr_in cli_addr;
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socklen_t addr_len = sizeof(cli_addr);
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char buf[1024];
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int reuse = 1;
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/* create UDP socket */
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sockfd = socket(AF_INET, SOCK_DGRAM, 0);
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if(sockfd < 0 )
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{
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printf("create socket failure: %s\n", strerror(errno));
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return -1;
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}
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printf("socket create fd[%d]\n", sockfd);
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/* fix port can not be used when stop server program and run it again immediately */
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setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &reuse, sizeof(reuse));
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/* bind socket server information */
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memset(&serv_addr, 0, sizeof(serv_addr));
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serv_addr.sin_family = AF_INET;
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serv_addr.sin_port = htons(LISTEN_PORT);
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serv_addr.sin_addr.s_addr = htonl(INADDR_ANY);
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if( bind(sockfd, (struct sockaddr *)&serv_addr, sizeof(serv_addr)) < 0 )
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{
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printf("create socket failure: %s\n", strerror(errno));
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return -2;
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}
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printf("socket[%d] bind on port[%d] for all IP address ok\n", sockfd, LISTEN_PORT);
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while(1)
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{
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/* receive message from socket client */
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memset(buf, 0, sizeof(buf));
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if( (rv=recvfrom(sockfd, buf, sizeof(buf), 0, (struct sockaddr *)&cli_addr, &addr_len)) < 0)
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{
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printf("Read data from socket[%d] failure: %s\n", sockfd, strerror(errno));
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break;
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}
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printf("Read [%d] bytes data from client[%s:%d]: %s\n",
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rv, inet_ntoa(cli_addr.sin_addr), ntohs(cli_addr.sin_port), buf);
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/* send message to socket client */
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printf("Reply back to socket client...\n");
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snprintf(buf, sizeof(buf), "Hello, socket client [%s:%d]\n", inet_ntoa(cli_addr.sin_addr), ntohs(cli_addr.sin_port));
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if( (rv=sendto(sockfd, buf, sizeof(buf), 0, (struct sockaddr *)&cli_addr, addr_len)) < 0)
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{
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printf("Reply back to socket client[%d] failure: %s\n", sockfd, strerror(errno));
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break;
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}
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printf("\n");
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}
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close(sockfd);
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return 0;
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}
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