C TCP协议的网络编程

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TCP_server.c:

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>

int main()
{
int listenfd,connfd;
int n;
int i;
struct sockaddr_in servaddr,cliaddr;
socklen_t clilen;
char mesg[1000];

listenfd = socket(AF_INET,SOCK_STREAM,0);

bzero(&servaddr,sizeof(servaddr));
servaddr.sin_family = AF_INET;
servaddr.sin_addr.s_addr = htonl(INADDR_ANY);
servaddr.sin_port = htons(32000);

bind(listenfd,(struct sockaddr *)&servaddr,sizeof(servaddr));

listen(listenfd,1024);
for(;;)
{
clilen = sizeof(cliaddr);
connfd = accept(listenfd,(struct sockaddr *)&cliaddr,&clilen);

if(fork() == 0)
{
close(listenfd);
for(;;)
{

n = recvfrom(connfd,mesg,1000,0,(struct sockaddr *)&cliaddr,&clilen);
if(n == 0)
{
printf("client is closed!\n");

break;
}

printf("*************************************\n");
mesg[n] = '\0';
printf("%s\n",mesg);
printf("*************************************\n");

for(i = 0;i <=n;i++)
{
if(mesg[i]>='a'&&mesg[i]<='z')

{
mesg[i] -= 32;
}
}

sendto(connfd,mesg,n,0,(struct sockaddr *)&cliaddr,sizeof(cliaddr));
}
close(connfd);
}
}
close(listenfd);

return 0;

}

TCP_client.c:

#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <string.h>
#include <stdlib.h>
#include <netinet/in.h>

int main(int argc,char **argv)
{
int sockfd;
int n;
struct sockaddr_in servaddr,cliaddr;
char sendline[1000];
char recvline[1000];

if(argc != 2)
{
printf("please input something!\n");
exit(0);
}

sockfd = socket(AF_INET,SOCK_STREAM,0);

bzero(&servaddr,sizeof(servaddr));
servaddr.sin_family = AF_INET;
servaddr.sin_addr.s_addr = inet_addr(argv[1]);
servaddr.sin_port = htons(32000);

connect(sockfd,(struct sockaddr *)&servaddr,sizeof(servaddr));

while(fgets(sendline,1000,stdin)!=NULL)
{
sendto(sockfd,sendline,strlen(sendline),0,(struct sockaddr *)&servaddr,sizeof(servaddr));
n = recvfrom(sockfd,recvline,1000,0,NULL,NULL);

recvline[n] = '\0';
fputs(recvline,stdout);
}

return 0;
}

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