系统ping程序的源程序

#pragma pack(4)
#pragma comment(lib, "ws2_32.lib")
#include   "winsock2.h"
#include   "stdlib.h"
#include   "stdio.h"
#define ICMP_ECHO 8//定义回显报文代码
#define ICMP_ECHOREPLY 0
#define ICMP_MIN 8 //最小8字节ICMP包

/* IP头首部结构 */
typedef struct iphdr {
 unsigned int h_len:4; // 首部长度
 unsigned int version:4; // IP版本
 unsigned char tos; // 服务类型
 unsigned short total_len; // 包总长度
 unsigned short ident; //标识符
 unsigned short frag_and_flags; // 标志
 unsigned char ttl;// 生存周期
 unsigned char proto; // protocol (TCP, UDP etc) 协议类型
 unsigned short checksum; //IP检验和
 unsigned int sourceIP;//源地址IP
 unsigned int destIP;//目的地址IP
}IpHeader;

//
// ICMP 首部结构
//

typedef struct icmphdr {
 BYTE i_type;//类型

 BYTE i_code; // 代码类型
 USHORT i_cksum;//检验和
 USHORT i_id;//地址
 USHORT i_seq;//发送顺序
 /* This is not the std header, but we reserve space for time */
 ULONG timestamp;//接受时间
}IcmpHeader;

#define STATUS_FAILED 0xFFFF
#define DEF_PACKET_SIZE    32   //默认包的大小
#define DEF_PACKET_NUMBER  4    /* 发送数据报的个数 */
#define MAX_PACKET 1024         //最大ICMP大小

#define xmalloc(s) HeapAlloc(GetProcessHeap(),HEAP_ZERO_MEMORY,(s))
#define xfree(p) HeapFree (GetProcessHeap(),0,(p))
void fill_icmp_data(char *, int);
USHORT checksum(USHORT *, int);
int decode_resp(char *,int ,struct sockaddr_in *);


void Usage(char *progname){
 fprintf(stderr,"Usage:\n");
 fprintf(stderr,"%s [number of packets] [data_size]\n",progname);
 fprintf(stderr,"datasize can be up to 1Kb\n");
 ExitProcess(STATUS_FAILED);//结束此进程返回给父进程值
}
/*主函数
agrc : 参数的个数 ,默认为一
agrv : 参数的内容 ，用于传递输入的IP地址
调试方法：在CMD命令行中到该程序的子目录打xping 127.0.0.1（IP地址任意）