一个编程题，希望大家能帮帮忙呀！！！运行后一直进行，按任何键都不停，怎么回事啊？
简单的网络嗅探器目的与要求：实现网络层抓包，并对获得包的源和目的地址、端口、协议等进行分析，实现简单的包嗅探器功能。
#include <winsock2.h> /*windows socket的头文件，系统定义的*/
#include <windows.h>
#include <ws2tcpip.h>
#include <stdio.h>
#include <stdlib.h>
#pragma comment(lib,"ws2_32.lib") /*链接API相关连的Ws2_32.lib静态库*/
#define MAX_HOSTNAME_LAN 255
#define SIO_RCVALL _WSAIOW(IOC_VENDOR,1)
#define MAX_ADDR_LEN 16
struct ipheader {
unsigned char ip_hl:4; /*header length(报头长度）*/
unsigned char ip_v:4; /*version(版本)*/
unsigned char ip_tos; /*type os service服务类型*/
unsigned short int ip_len; /*total length (总长度)*/
unsigned short int ip_id; /*identification (标识符)*/
unsigned short int ip_off; /*fragment offset field(段移位域)*/
unsigned char ip_ttl; /*time to live (生存时间)*/
unsigned char ip_p; /*protocol(协议)*/
unsigned short int ip_sum; /*checksum(校验和)*/
unsigned int ip_src; /*source address(源地址)*/
unsigned int ip_dst; /*destination address(目的地址)*/
}; /* total ip header length: 20 bytes (=160 bits) */
typedef struct tcpheader {
unsigned short int sport; /*source port (源端口号)*/
unsigned short int dport; /*destination port(目的端口号)*/
unsigned int th_seq; /*sequence number(包的序列号)*/
unsigned int th_ack; /*acknowledgement number(确认应答号)*/
unsigned char th_x:4; /*unused(未使用)*/
unsigned char th_off:4; /*data offset(数据偏移量)*/
unsigned char Flags; /*标志全*/
unsigned short int th_win; /*windows(窗口)*/
unsigned short int th_sum; /*checksum(校验和)*/
unsigned short int th_urp; /*urgent pointer(紧急指针)*/
}TCP_HDR;
typedef struct udphdr {
unsigned short sport; /*source port(源端口号)*/
unsigned short dport; /*destination port(目的端口号)*/
unsigned short len; /*udp length(udp长度)*/
unsigned short cksum; /*udp checksum(udp校验和)*/
}UDP_HDR;
void main(){
SOCKET sock;
WSADATA wsd;
DWORD dwBytesRet;
unsigned int optval = 1;
unsigned char *dataudp,*datatcp;
int i,pCount=0,lentcp, lenudp;
SOCKADDR_IN sa,saSource, saDest;
struct hostent FAR * pHostent;
char FAR name[MAX_HOSTNAME_LAN];
char szSourceIP[MAX_ADDR_LEN], szDestIP[MAX_ADDR_LEN],RecvBuf[65535] = {0};
struct udphdr *pUdpheader;
struct ipheader *pIpheader;
struct tcpheader *pTcpheader;
WSAStartup(MAKEWORD(2,1),&wsd);
if ((sock = socket(AF_INET, SOCK_RAW, IPPROTO_IP))==SOCKET_ERROR)
exit(1);
gethostname(name, MAX_HOSTNAME_LAN);
pHostent = gethostbyname(name);
sa.sin_family = AF_INET;
sa.sin_port = htons(6000);
memcpy(&sa.sin_addr.S_un.S_addr, pHostent->h_addr_list[0], pHostent->h_length);
bind(sock, (SOCKADDR *)&sa, sizeof(sa)); /*bind()设定自己主机的IP地址和端口号*/
if ((WSAGetLastError())==10013)
exit(1);
WSAIoctl(sock, SIO_RCVALL, &optval, sizeof(optval), NULL, 0, &dwBytesRet, NULL, NULL);
pIpheader = (struct ipheader *)RecvBuf;
pTcpheader = (struct tcpheader *)(RecvBuf+ sizeof(struct ipheader ));
pUdpheader = (struct udphdr *) (RecvBuf+ sizeof(struct ipheader ));
while (1){
memset(RecvBuf, 0, sizeof(RecvBuf));
recv(sock, RecvBuf, sizeof(RecvBuf), 0);
saSource.sin_addr.s_addr = pIpheader->ip_src;
strncpy(szSourceIP, inet_ntoa(saSource.sin_addr), MAX_ADDR_LEN);
saDest.sin_addr.s_addr = pIpheader->ip_dst;
strncpy(szDestIP, inet_ntoa(saDest.sin_addr), MAX_ADDR_LEN);
lentcp =(ntohs(pIpheader->ip_len)-(sizeof(struct ipheader)+sizeof(struct tcpheader)));
lenudp =(ntohs(pIpheader->ip_len)-(sizeof(struct ipheader)+sizeof(struct udphdr)));
if((pIpheader->ip_p)==IPPROTO_TCP&&lentcp!=0){
printf("*******************************************\n");
pCount++;
datatcp=(unsigned char *) RecvBuf+sizeof(struct ipheader)+sizeof(struct tcpheader);
printf("-TCP-\n");
printf("\n目的IP地址：%s\n",szDestIP);
printf("\n目的端口：%i\n",ntohs(pTcpheader->dport));
printf("datatcp address->%x\n",datatcp);
printf("size of ipheader->%i\n",sizeof(struct ipheader));
printf("size of tcpheader->%i\n",sizeof(struct tcpheader));
printf("size of the hole packet->%i\n",ntohs(pIpheader->ip_len));
printf("\nchar Packet%i [%i]=\"",pCount,lentcp-1);
for (i=0;i<lentcp;i++){
printf("\\x%.2x",*(datatcp+i));
if (i%10==0)
printf("\"\n\"");
}
printf("\";\n\n\n");
for (i=0;i<lentcp;i++){
if( *(datatcp+i)<=127&&*(datatcp+i)>=20)
printf("%c",*(datatcp+i));
else
printf(".");
}
printf("\n\n*******************************************\n");
}
if((pIpheader->ip_p)==IPPROTO_UDP&&lentcp!=0){
pCount++;
dataudp=(unsigned char *) RecvBuf+sizeof(struct ipheader)+sizeof(struct udphdr);
printf("-UDP-\n");
printf("\n目的IP地址：%s\n",szDestIP);
printf("\n目的端口：%d\n",ntohs(pTcpheader->dport));
printf("UDP数据地址：%x\n",dataudp);
printf("IP头部长度：%i\n",sizeof(struct ipheader));
printf("UDP头部长度：%i\n",sizeof(struct udphdr));
printf("包的大小：%i\n",ntohs(pIpheader->ip_len));
printf("\nchar Packet%i [%i]=\"",pCount,lenudp-1);
for (i=0;i<lenudp;i++){
printf("\\x%.2x",*(dataudp+i));
if (i%10==0)
printf("\"\n\"");
}
printf("\";\n\n\n");
for (i=0;i<lenudp;i++){
if( *(dataudp+i)<=127&&*(dataudp+i)>=20)
printf("%c",*(dataudp+i));
else
printf(".");
}
printf("\n\n*******************************************\n");
}
}
}
[ 本帖最后由 C学徒 于 2012-6-15 17:51 编辑 ]
