这个程序什么地方有错误？
怎么运行不起来呀？没有反应server.c如下：
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <netdb.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#define BUFSIZE 65500
#define DEFAULT_PORT 5320
enum{CMD_NAME,DST_PORT};
int execute(char *command,char *buf,int bufmax);
int main(int argc,char *argv[])
{
struct sockaddr_in server;//服务器地址
struct sockaddr_in client;//客户端地址
int len;//sockaddr_in 的长度
int port;//端口地址
int s;//套接字描述符
int cn;//接收到的命令的字数
int sn;//发送报文的字节数
int rn;//接收报文的字节数
char cmd1[BUFSIZE];//第一个语句的命令
char cmd2[BUFSIZE];//第二个语句的命令
char recv_buf[BUFSIZE];//接收缓冲区
char send_buf[BUFSIZE];//发送缓冲区
/* 实际参数的处理*/
if(argc==2)
if ((port=atoi(argv[DST_PORT]))==0)
{
struct servent *se;//服务器信息
if((se=getservbyname(argv[DST_PORT],"udp") )!=NULL)
port=(int)ntohs((u_short)se->s_port);
else
{
fprintf(stderr,"getservbyname error\n");
exit(EXIT_FAILURE);
}
}
else
port =DEFAULT_PORT;
/*使用udp协议打开一个套接字*/
if((s=socket(AF_INET,SOCK_DGRAM,0))<0)
{
perror("socket");
exit(EXIT_FAILURE);
}
memset((char*)&server,0,sizeof(server));
server.sin_family=AF_INET;
server.sin_addr.s_addr=htonl(INADDR_ANY);
//server.sin_addr.s_addr=215546489;
server.sin_port=htons(port);
if(bind(s,(struct sockaddr *)&server,sizeof(server))<0)
{
perror("bind");
exit(EXIT_FAILURE);
}
/*服务器处理的主要子程序*/
len=sizeof(client);
printf("wainting for connection...\n");
while((rn=recvfrom(s,recv_buf,BUFSIZE-1,0,(struct sockaddr*)&client,&len))>0)
{
recv_buf[rn]='\0';
printf("receive %s\n",recv_buf);
/*接收到的命令处理*/
if((cn=sscanf(recv_buf,"%s%s",cmd1,cmd2))<=0)
{
sn=0;
}
else if(cn==2&&strcmp(cmd1,"show")==0)
{
if(strcmp(cmd2,"route")==0)
#ifdef linux
sn=execute("/bin/netstat -rn",send_buf,BUFSIZE);
#else
sn=execute("/usr/bin/netstat -rn",send_buf,BUFSIZE);
#endif
else if(strcmp(cmd2,"arp")==0)
#ifdef linux
sn=execute("/sbin/arp -an",send_buf,BUFSIZE);
#else
sn=execute("/usr/bin/arp -an",send_buf,BUFSIZE);
#endif
else if(strcmp(cmd2,"tcp")==0)
#ifdef linux
sn=execute("/bin/netstat -tn",send_buf,BUFSIZE);
#else
sn=execute("/usr/bin/netstat -tn",send_buf,BUFSIZE);
#endif
else if(strcmp(cmd2,"nic")==0)
sn=execute("/sbin/ifconfig -a",send_buf,BUFSIZE);
else{
sn=sprintf(send_buf,"parameter error %s\n","show [route|arp|tcp|nic]\n",cmd2);
printf("%s",send_buf);
}
}
else if(cn==1&&strcmp(cmd1,"help")==0)
{
sn=sprintf(send_buf,"%s%s%s%s%s%s","Command:\n","show route \n","show arp \n","show tcp \n","show nic \n","help\n");
sn=sizeof(send_buf);
}
else
sn=sprintf(send_buf,"Command error%s",cmd1);
if(sendto(s,send_buf,sn,0,(struct sockaddr *)&client,len)<0)
break;
printf("%s",send_buf);
}
close(s);
return EXIT_SUCCESS;
}
int execute(char *command,char *buf,int bufmax)
{
FILE *fp;
int i;
if((fp=popen(command,"r"))==NULL)
{
perror(command);
exit(EXIT_FAILURE);
}
i=0;
while((buf[i++]=fgetc(fp))!=EOF&&i<bufmax);
pclose(fp);
return i;
}
client.c如下：
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <netdb.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#define BUFSIZE 65500
#define DEFAULT_PORT 5320
enum{CMD_NAME,DST_IP,DST_PORT};
int main(int argc,char *argv[])
{
struct sockaddr_in server;//服务器地址
struct sockaddr_in client;//客户端地址
unsigned long dst_ip;//服务器IP地址
int port ;//端口号
int s;//套接自描述
int n;//输入数据的字节数
char buf[BUFSIZE];//接收缓冲去
char cmd[BUFSIZE];//发送缓冲区
int zero;
/*实际参数检查*/
if(argc!=2&&argc!=3)
{
fprintf(stderr,"Usage:%s hostname [port]",argv[0]);
exit(EXIT_FAILURE);
}
if((dst_ip=inet_addr(argv[DST_IP]))==INADDR_NONE)
{ struct hostent *he;
printf("int dst_ip");
if((he=gethostbyname(argv[DST_IP]))==NULL)
{
fprintf(stderr,"gethostbyname error\n");
exit(EXIT_FAILURE);
}
memcpy((char *)&dst_ip,(char *)he->h_addr,he->h_length);
}
printf("outof dst_ip");
if(argc==3)
{
if((port=atoi(argv[DST_PORT]))==0)
{
struct servent *se;
if((se=getservbyname(argv[DST_PORT],"udp"))!=NULL)
{
port=(int)ntohs((u_short)se->s_port);
}
else
{
fprintf(stderr,"getservbyname error");
exit(EXIT_FAILURE);
}
}
}
else
port=DEFAULT_PORT;
if((s=socket(AF_INET,SOCK_DGRAM,0))<0)
{
perror("socket");
exit(EXIT_FAILURE);
}
memset((char *)&client ,0,sizeof(client));
client.sin_family=AF_INET;
client.sin_addr.s_addr=htonl(INADDR_ANY);
client.sin_port=htons(0);
if(bind(s,(struct sockaddr *)&client,sizeof(client))<0)
{
perror("bind");
exit(EXIT_FAILURE);
}
memset((char *)&server,0,sizeof(server));
server.sin_family=AF_INET;
server.sin_addr.s_addr=dst_ip;
server.sin_port=htons(port);
printf("ip:%d\n",dst_ip);
zero=0;
printf("UDP>");
fflush(stdout);
//printf("outof while\n");
//printf("%ld",dst_ip);
while((n=read(0,buf,BUFSIZE))>0)
{// printf("in while\n");
buf[n]='\0';
// printf("%s",buf);
sscanf(buf,"%s",cmd);
// printf("after sscanf\n");
//printf("%s\n",cmd);
if(strcmp(cmd,"quit")==0)
{
printf("in strcmp\n");
break;
}
printf("before sendto");
if(sendto(s,buf,n,0,(struct sockaddr*)&server,sizeof(server))<0)
{
printf("in sendto");
break;
}
printf("after sendto");
if(n=recvfrom(s,buf,BUFSIZE-1,0,(struct sockaddr*)&server,sizeof(server))<0)
break;
printf("after recv");
buf[n]='\0';
printf("%s",buf);
printf("UDP>");
fflush(stdout);
}
close(s);
return EXIT_SUCCESS;
}
编译 通过后我先开一个终端运行./server
然后开一个终运行./client 加上自己的ip 为什么输入help后没有回应？我现在不知道这个socket到底连接起来了没有。 问题已经解决，呵呵... 恭喜，呵呵 恭喜恭喜,呵呵
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