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            網絡編程小例

            //server.c
             1#include <stdlib.h>
             2#include <stdio.h>
             3#include <errno.h>
             4#include <string.h>
             5#include <unistd.h>
             6#include <netdb.h>
             7#include <sys/socket.h>
             8#include <netinet/in.h>
             9#include <sys/types.h>
            10#include <arpa/inet.h>
            11
            12int main(int argc, char *argv[])
            13{
            14        int sockfd,new_fd;
            15        struct sockaddr_in server_addr;
            16        struct sockaddr_in client_addr;
            17        int sin_size,portnumber;
            18        char hello[]="Hello! Are You Fine?\n";
            19
            20        if(argc!=2)
            21        {
            22                fprintf(stderr,"Usage:%s portnumber\a\n",argv[0]);
            23                exit(1);
            24        }

            25
            26        if((portnumber=atoi(argv[1]))<0)
            27        {
            28                fprintf(stderr,"Usage:%s portnumber\a\n",argv[0]);
            29                exit(1);
            30        }

            31
            32        /* 服務器端開始建立socket描述符 */
            33        if((sockfd=socket(AF_INET,SOCK_STREAM,0))==-1
            34        {
            35                fprintf(stderr,"Socket error:%s\n\a",strerror(errno));
            36                exit(1);
            37        }

            38
            39        /* 服務器端填充 sockaddr結構  */
            40        bzero(&server_addr,sizeof(struct sockaddr_in));
            41        server_addr.sin_family=AF_INET;
            42        server_addr.sin_addr.s_addr=htonl(INADDR_ANY);
            43        server_addr.sin_port=htons(portnumber);
            44
            45        /* 捆綁sockfd描述符  */
            46        if(bind(sockfd,(struct sockaddr *)(&server_addr),sizeof(struct sockaddr))==-1)
            47        {
            48                fprintf(stderr,"Bind error:%s\n\a",strerror(errno));
            49                exit(1);
            50        }

            51
            52        /* 監聽sockfd描述符  */
            53        if(listen(sockfd,5)==-1)
            54        {
            55                fprintf(stderr,"Listen error:%s\n\a",strerror(errno));
            56                exit(1);
            57        }

            58
            59        while(1)
            60        {
            61                /* 服務器阻塞,直到客戶程序建立連接  */
            62                sin_size=sizeof(struct sockaddr_in);
            63                if((new_fd=accept(sockfd,(struct sockaddr *)(&client_addr),&sin_size))==-1)
            64                {
            65                        fprintf(stderr,"Accept error:%s\n\a",strerror(errno));
            66                        exit(1);
            67                }

            68
            69                fprintf(stderr,"Server get connection from %s\n",
            70                inet_ntoa(client_addr.sin_addr));
            71                if(write(new_fd,hello,strlen(hello))==-1)
            72                {
            73                        fprintf(stderr,"Write Error:%s\n",strerror(errno));
            74                        exit(1);
            75                }

            76                /* 這個通訊已經結束     */
            77                close(new_fd);
            78                /* 循環下一個     */ 
            79        }

            80        close(sockfd);
            81        exit(0);
            82}



            //client.c
             1#include <stdlib.h>
             2#include <stdio.h>
             3#include <errno.h>
             4#include <string.h>
             5#include <unistd.h>
             6#include <netdb.h>
             7#include <sys/socket.h>
             8#include <netinet/in.h>
             9#include <sys/types.h>
            10#include <arpa/inet.h>
            11
            12int main(int argc, char *argv[])
            13{
            14        int sockfd;
            15        char buffer[1024];
            16        struct sockaddr_in server_addr;
            17        struct hostent *host;
            18        int portnumber,nbytes;
            19
            20        if(argc!=3)
            21        {
            22                fprintf(stderr,"Usage:%s hostname portnumber\a\n",argv[0]);
            23                exit(1);
            24        }

            25
            26        if((host=gethostbyname(argv[1]))==NULL)
            27        {
            28                fprintf(stderr,"Gethostname error\n");
            29                exit(1);
            30        }

            31
            32        if((portnumber=atoi(argv[2]))<0)
            33        {
            34                fprintf(stderr,"Usage:%s hostname portnumber\a\n",argv[0]);
            35                exit(1);
            36        }

            37
            38        /* 客戶程序開始建立 sockfd描述符  */
            39        if((sockfd=socket(AF_INET,SOCK_STREAM,0))==-1)
            40        {
            41                fprintf(stderr,"Socket Error:%s\a\n",strerror(errno));
            42                exit(1);
            43        }

            44
            45        /* 客戶程序填充服務端的資料       */
            46        bzero(&server_addr,sizeof(server_addr));
            47        server_addr.sin_family=AF_INET;
            48        server_addr.sin_port=htons(portnumber);
            49        server_addr.sin_addr=*((struct in_addr *)host->h_addr);
            50
            51        /* 客戶程序發起連接請求         */
            52        if(connect(sockfd,(struct sockaddr *)(&server_addr),sizeof(struct sockaddr))==-1)
            53        {
            54                fprintf(stderr,"Connect Error:%s\a\n",strerror(errno));
            55                exit(1);
            56        }

            57
            58        /* 連接成功了           */
            59        if((nbytes=read(sockfd,buffer,1024))==-1)
            60        {
            61                fprintf(stderr,"Read Error:%s\n",strerror(errno));
            62                exit(1);
            63        }

            64        buffer[nbytes]='\0';
            65        printf("I have received:%s\n",buffer);
            66        /* 結束通訊     */
            67        close(sockfd);
            68        exit(0);
            69}
            posted on 2010-05-12 10:01 zhongguoa 閱讀(344) 評論(0)  編輯 收藏 引用
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