?? server.c
字號:
#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 hostent
{
char *h_name;
char **h_aliases;
int h_addrtype;
int h_length;
char **h_addr_list;
};*/
struct sockaddr_in addr;
/*在netinet/in.h中定義
struct sockaddr_in
{
short int sin_family; /* sin_family指代協議族,在socket編程中只能是AF_INET
unsigned short int sin_port; /* sin_port存儲端口號(使用網絡字節順序)
struct in_addr sin_addr; /* sin_addr存儲IP地址,使用in_addr這個數據結構
unsigned char sin_zero[8]; /* sin_zero是為了讓sockaddr與sockaddr_in兩個數據結構保持大小相同而保留的空字節。
};
/*根據主機名查找主機的IP,別名*/
hp=gethostbyname(ip);
if (hp==NULL)
{
perror( "hostent error" );
return -2;
}
/*創建Socket套接字*/
if((s=socket(AF_INET,SOCK_STREAM,0))<0)
{
perror( "socket error" );
return( -1 );
}
/*初始化與賦值*/
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);
/*顯示信息*/
printf("Server %s:%d 等待連接....\n",ip,port);
/*與本機地址以及一個本地端口號綁定*/
if(bind(s,( struct sockaddr * )&addr,sizeof(addr))<0)
{
perror("bind");
exit(1);
}
/*在創建的Socket上監聽*/
if(listen(s,5)<0){
perror("listen ");
exit(5);
}
/*打開文件*/
if ( (f=open(file,O_RDONLY)) < 0 )
{
perror("file open ");
exit(5);
}
/*服務端主循環*/
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;
}
/*程序主函數*/
int main(int argc, char* argv[])
{
if(argc!=4)
printusage();
else
sendfile(argv[1],argv[3],atoi(argv[2]));
return 0;
}
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