学习笔记:UDP用户数据报协议(1)(2)
4、UDP服务器的设计与实现
- /*********************************************************************************
- *Author : wph
- *Version : 1.0
- *Date : 2014/03/01
- *Description: udp server
- *Others :
- *History :
- **********************************************************************************/
- #include<stdio.h>
- #include<string.h>
- #include<unistd.h>
- #include<sys/types.h>
- #include<sys/socket.h>
- #include<stdlib.h>
- #include<netinet/in.h>
- #include<arpa/inet.h>
- #include<event2/event.h>
- #include "errocode.h"
- #include "basetype.h"
- #define INVALID_FD -1
- #define PORT 1234
- #define MAXDATASIZE 512
- STATIC INT g_iudpFd = INVALID_FD;
- VOID udp_callback(evutil_socket_t fd, short what, void *arg)
- {
- struct sockaddr_in client;
- socklen_t addrlen;
- int num;
- char buf[MAXDATASIZE];
- memset(buf, 0, MAXDATASIZE);
- num = recvfrom(fd, buf, MAXDATASIZE, 0, (struct sockaddr*)&client, &addrlen);
- if (num < 0)
- {
- perror("recvfrom() error\n");
- exit(1);
- }
- printf("You got a message (%s) from client.\nIt's ip is%s, port is %d.\n",
- buf, inet_ntoa(client.sin_addr), htons(client.sin_port));
- sendto(fd, buf, num, 0, (struct sockaddr *)&client, addrlen);
- }
- ULONG udp_init(VOID)
- {
- int sockfd;
- struct sockaddr_in server;
- /* The caller has already set up fd1, fd2 somehow, and make them
- nonblocking. */
- sockfd = socket(AF_INET, SOCK_DGRAM, 0);
- if(INVALID_FD == sockfd)
- {
- perror("Creatingsocket failed.");
- exit(1);
- }
- bzero(&server, sizeof(server));
- server.sin_family = AF_INET;
- server.sin_port= htons(PORT);
- server.sin_addr.s_addr= htonl(INADDR_ANY);
- if(-1 == bind(sockfd, (struct sockaddr *)&server, sizeof(server)))
- {
- perror("Bind()error.");
- exit(1);
- }
- g_iudpFd = sockfd;
- return EROOR_SUCCESS;
- }
- VOID udp_fini(VOID)
- {
- int sockfd = g_iudpFd;
- if (INVALID_FD != sockfd)
- {
- close(sockfd);
- }
- }
- VOID main_loop(VOID)
- {
- INT ifd = g_iudpFd;
- struct event *ev1;
- struct timeval five_seconds = {5,0};
- struct event_base *base = event_base_new();
- /* upd 服务器采用libevet进行处理 */
- ev1 = event_new(base, ifd, EV_TIMEOUT|EV_READ|EV_PERSIST, udp_callback, NULL);
- event_add(ev1, &five_seconds);
- event_base_dispatch(base);
- return ;
- }
- INT main()
- {
- if(EROOR_SUCCESS != udp_init())
- {
- return -1;
- }
- main_loop();
- udp_fini();
- return 0;
- }
- /*********************************************************************************
- *Copyright(C),2010-2011,
- *Author : wph
- *Version : 1.0
- *Date : 2014/03/01
- *Description: udp client
- *Others :
- *History :
- **********************************************************************************/
- #include <stdio.h>
- #include <stdlib.h>
- #include <unistd.h>
- #include <string.h>
- #include <sys/types.h>
- #include <sys/socket.h>
- #include <netinet/in.h>
- #include <netdb.h>
- #include "errocode.h"
- #include "basetype.h"
- #define INVALID_FD -1
- #define PORT 1234
- #define MAXDATASIZE 512
- INT main(INT argc, CHAR *argv[])
- {
- INT isockfd = INVALID_FD;
- UINT uinum = 0;
- char buf[MAXDATASIZE];
- socklen_t addrlen;
- struct hostent *he;
- struct sockaddr_in server;
- struct sockaddr_in peer;
- if (3 != argc)
- {
- printf("Usage: %s <IP Address><message>\n", argv[0]);
- exit(1);
- }
- if (NULL == (he=gethostbyname(argv[1])))
- {
- printf("gethostbyname()error\n");
- exit(1);
- }
- if (INVALID_FD == (isockfd = socket(AF_INET, SOCK_DGRAM,0)))
- {
- printf("socket() error\n");
- exit(1);
- }
- bzero(&server,sizeof(server));
- server.sin_family = AF_INET;
- server.sin_port = htons(PORT);
- server.sin_addr= *((struct in_addr *)he->h_addr);
- sendto(isockfd, argv[2],strlen(argv[2]),0,(struct sockaddr *)&server,sizeof(server));
- addrlen=sizeof(server);
- while (1)
- {
- if((uinum=recvfrom(isockfd, buf, MAXDATASIZE, 0, (struct sockaddr *)&peer, &addrlen))== -1)
- {
- printf("recvfrom() error\n");
- exit(1);
- }
- if (addrlen != sizeof(server) || memcmp((const void *)&server, (const void *)&peer, addrlen) != 0)
- {
- printf("Receive message from otherserver.\n");
- continue;
- }
- buf[uinum]='\0';
- printf("Server Message:%s\n", buf);
- break;
- }
- close(isockfd);
- }
演示:
[root@localhost server]# ./udpserver &
[1] 1389
[root@localhost server]# ./udpclient 127.0.0.1 "i like you"
You got a message (i like you) from client.
It's ip is127.0.0.1, port is 34340.
Server Message:i like you
[root@localhost server]# netstat -aun
Active Internet connections (servers and established)
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