server.cpp

linux下socket网络编程实例源代码

#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <netdb.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#define SIZE 1024
char *site="166.111.107.7";
void printusage()
{
printf("please enter port and filename \n \n");
}

int sendfile(const char *ip, char *file, int port){

//system("clear");
char buf[SIZE];
int s,k,f,des;
int len=sizeof(struct sockaddr_in);
struct hostent *hp;
struct sockaddr_in addr;
hp=gethostbyname(ip);
if (hp==NULL)
{
perror( "hostent error" );
return -2;
}

if((s=socket(AF_INET,SOCK_STREAM,0))<0){
perror( "socket error" );
return( -1 ); 

}

memset(&addr,0,sizeof(struct sockaddr_in));
addr.sin_family=AF_INET;
addr.sin_port=htons(port);
//addr.sin_addr.s_addr=inet_addr(ip);
memcpy(&addr.sin_addr,hp->h_addr_list[0],hp->h_length);
//addr.sin_addr.s_addr= htonl(INADDR_ANY);

printf("Server %s:%d 等待连接....\n",ip,port);

if(bind(s,( struct sockaddr * )&addr,sizeof(addr))<0){
perror("bind");
exit(1);
}

if(listen(s,5)<0){
perror("listen ");
exit(5);
}

if ( (f=open(file,O_RDONLY)) < 0 )
{
perror("file open ");
exit(5);
} 

while(1)
{

if( (des=accept(s,(struct sockaddr *)&addr,(socklen_t*)&len)) >=0 ) {
printf(" start %s send to %s ",file,inet_ntoa(addr.sin_addr));
}
else
{
perror("accept");
exit(5);
}

lseek (f,0,SEEK_SET);

//write(des,"welcome to server",20); 

while((k=read(f,buf,sizeof(buf)))>0)
write(des,buf,k); 

close(des);

}

close(f);

// close(s);

return 0;
}

int
main(int argc, char* argv[]){
if(argc!=4) printusage();
else
sendfile(argv[1],argv[3],atoi(argv[2]));
return 0;
}