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Linux/Unix下Socket編程

←手機掃碼閱讀     火星人 @ 2014-03-09 , reply:0
演示linux的客戶端和伺服器端的通信過程.要同時啟動兩個terminal,一個運行Server,一個運行Client.通過Client向Server發送主機名和要檢索的字元串.Server端接到客戶端的請求后,便根據客戶端發過來的原串去文件server.conf中檢索其對應的值,找到后就把值返回給Client.否則返回"not find" server.conf文件格式為: name=aaa mail=adfaf : : : 編譯源文件:gcc -o Server Server.c gcc -o Client Client.c 先啟動Server,在命令提示符下輸入:Server 再啟動Client,在命令提示符下輸入:Client redhat4 name #我的主機名是redhat4 伺服器端源碼: #include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <sys/wait.h>
#define SERVPORT 35235
#define BACKLOG 10
main()
{
int sockfd,client_fd;
struct sockaddr_in my_addr;
struct sockaddr_in remote_addr;

/* The fllow variables using to file */
char lineStr[30];
char recStr[20];
char headStr[15],tailStr[15];
char *delim="=";
FILE *file;
int flag=0;

if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1)


{
perror("socket error");
exit(1);
}
//設置本地socket實例的協議族,連接埠等
my_addr.sin_family=AF_INET;
my_addr.sin_port=htons(SERVPORT);
my_addr.sin_addr.s_addr = INADDR_ANY;
bzero(&(my_addr.sin_zero),8);
if (bind(sockfd, (struct sockaddr *)&my_addr, sizeof(struct sockaddr)) == -1)
{
perror("bind error!");
exit(1);
}
if (listen(sockfd, BACKLOG) == -1)
{
perror("listen error!");
exit(1);
}
//監聽並處理客戶的連接請求
while(1)
{
int sin_size = sizeof(struct sockaddr_in);
if ((client_fd = accept(sockfd, (struct sockaddr *)&remote_addr, &sin_size)) == -1)
{
perror("accept error!");
continue;
}
printf("received a connection from %s\n", inet_nto(remote_addr.sin_addr));

//創建子進程,檢索目標串並把結果返回個客戶端
if (!fork())
{
int len;
if((len=recv(client_fd,recStr,30,0))==-1)
{
printf("Receive error!\n");
exit(1);
}
recStr[len]='\0';
file=fopen("server.conf","r");
printf("Client send: %s\n",recStr);
while(fgets(lineStr,30,file))
{
//以「=」為標記,分別去等號的左邊和右邊,分別存入headStr和tailStr
strcpy(headStr,strtok(lineStr,delim));
strcpy(tailStr,strtok(NULL,delim));
if(strcmp(headStr,recStr)==0)
{
flag=1;
if(send(client_fd,tailStr,20,0)==-1)
{
perror("send error!");


exit(1);
}
/* break; */
}
}
if(flag==0)
send(client_fd,"Not find",9,0);

close(client_fd);
exit(0);
}
close(client_fd);
}
} 客戶端源碼: #include<stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <netdb.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <sys/socket.h>
#define SERVPORT 35235
#define MAXDATASIZE 100
main(int argc, char *argv[])
{
int sockfd, recvbytes;
char buf[MAXDATASIZE];
struct hostent *host;
struct sockaddr_in serv_addr;
if (argc < 3)
{
fprintf(stderr,"Please enter the server's hostname and string!\n");
exit(1);
}
if((host=gethostbyname(argv[1]))==NULL)
{
herror("gethostbyname砮error!");
exit(1);
}
if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1)
{
perror("socket?error!");
exit(1);
}
//設置連接伺服器的協議族,埠號,伺服器端的地址等
serv_addr.sin_family=AF_INET;
serv_addr.sin_port=htons(SERVPORT);


serv_addr.sin_addr = *((struct in_addr *)host->h_addr);
bzero(&(serv_addr.sin_zero),8);
if (connect(sockfd, (struct sockaddr *)&serv_addr,sizeof(struct sockaddr)) == -1)
{
perror("connect?error!");
exit(1);
}
if(send(sockfd,argv[2],20,0)==-1)
{
printf("send to server error!\n");
exit(1);
}
if ((recvbytes=recv(sockfd, buf, MAXDATASIZE, 0)) ==-1)
{
perror("recv?error");
exit(1);
}
buf[recvbytes] = '\0';
printf("Received: %s\n",buf);
close(sockfd);
}


[火星人 ] Linux/Unix下Socket編程已經有607次圍觀

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