c语言实现如果cmd中的ping.zip
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c语言实现如果cmd中的ping.zip
/*导入库文件*/
#pragma comment( lib, "ws2_32.lib" )
/*加载头文件*/
#include
#include
#include
#include
#include
/* 【自学去】网站收集 http://www.zixue7.com */
/*定义常量*/
/*表示要记录路由*/
#define IP_RECORD_ROUTE 0x7
/*默认数据报大小*/
#define DEF_PACKET_SIZE 32
/*最大的ICMP数据报大小*/
#define MAX_PACKET 1024
/*最大IP头长度*/
#define MAX_IP_HDR_SIZE 60
/*ICMP报文类型,回显请求*/
#define ICMP_ECHO 8
/*ICMP报文类型,回显应答*/
#define ICMP_ECHOREPLY 0
/*最小的ICMP数据报大小*/
#define ICMP_MIN 8
/*自定义函数原型*/
void InitPing();
void UserHelp();
void GetArgments(int argc, char** argv);
USHORT CheckSum(USHORT *buffer, int size);
void FillICMPData(char *icmp_data, int datasize);
void FreeRes();
void DecodeIPOptions(char *buf, int bytes);
void DecodeICMPHeader(char *buf, int bytes, SOCKADDR_IN* from);
void PingTest(int timeout);
/*IP报头字段数据结构*/
typedef struct _iphdr
{
unsigned int h_len:4; /*IP报头长度*/
unsigned int version:4; /*IP的版本号*/
unsigned char tos; /*服务的类型*/
unsigned short total_len; /*数据报总长度*/
unsigned short ident; /*惟一的标识符*/
unsigned short frag_flags; /*分段标志*/
unsigned char ttl; /*生存期*/
unsigned char proto; /*协议类型(TCP、UDP等)*/
unsigned short checksum; /*校验和*/
unsigned int sourceIP; /*源IP地址*/
unsigned int destIP; /*目的IP地址*/
} IpHeader;
/*ICMP报头字段数据结构*/
typedef struct _icmphdr
{
BYTE i_type; /*ICMP报文类型*/
BYTE i_code; /*该类型中的代码号*/
USHORT i_cksum; /*校验和*/
USHORT i_id; /*惟一的标识符*/
USHORT i_seq; /*序列号*/
ULONG timestamp; /*时间戳*/
} IcmpHeader;
/*IP选项头字段数据结构*/
typedef struct _ipoptionhdr
{
unsigned char code; /*选项类型*/
unsigned char len; /*选项头长度*/
unsigned char ptr; /*地址偏移长度*/
unsigned long addr[9]; /*记录的IP地址列表*/
} IpOptionHeader;
/*定义全局变量*/
SOCKET m_socket;
IpOptionHeader IpOption;
SOCKADDR_IN DestAddr;
SOCKADDR_IN SourceAddr;
char *icmp_data;
char *recvbuf;
USHORT seq_no ;
char *lpdest;
int datasize;
BOOL RecordFlag;
double PacketNum;
BOOL SucessFlag;
/*初始化变量函数*/
void InitPing()
{
WSADATA wsaData;
icmp_data = NULL;
seq_no = 0;
recvbuf = NULL;
RecordFlag = FALSE;
lpdest = NULL;
datasize = DEF_PACKET_SIZE;
PacketNum = 5;
SucessFlag = FALSE;
/*Winsock初始化*/
if (WSAStartup(MAKEWORD(2, 2), &wsaData) != 0)
{
/*如果初始化不成功则报错,GetLastError()返回发生的错误信息*/
printf("WSAStartup() failed: %d\n", GetLastError());
return ;
}
m_socket = INVALID_SOCKET;
}
/*显示信息函数*/
void UserHelp()
{
printf("UserHelp: ping -r [data size]\n");
printf(" -r record route\n");
printf(" -n record amount\n");
printf(" host remote machine to ping\n");
printf(" datasize can be up to 1KB\n");
ExitProcess(-1);
}
/*获取ping选项函数*/
void GetArgments(int argc,char** argv)
{
int i;
int j;
int exp;
int len;
int m;
/*如果没有指定目的地地址和任何选项*/
if(argc == 1)
{
printf("\nPlease specify the destination IP address and the ping option as follow!\n");
UserHelp();
}
for(i = 1; i < argc; i++)
{
len = strlen(argv[i]);
if (argv[i][0] == '-')
{
/*选项指示要获取记录的条数*/
if(isdigit(argv[i][1]))
{
PacketNum = 0;
for(j=len-1,exp=0;j>=1;j--,exp++)
/*根据argv[i][j]中的ASCII值计算要获取的记录条数(十进制数)*/
PacketNum += ((double)(argv[i][j]-48))*pow(10,exp);
}
else
{
switch (tolower(argv[i][1]))
{
/*选项指示要获取路由信息*/
case 'r':
RecordFlag = TRUE;
break;
/*没有按要求提供选项*/
default:
UserHelp();
break;
}
}
}
/*参数是数据报大小或者IP地址*/
else if (isdigit(argv[i][0]))
{
for(m=1;m 1)
{
cksum += *buffer++;
size -= sizeof(USHORT);
}
if (size)
{
cksum += *(UCHAR*)buffer;
}
/*对每个16bit进行二进制反码求和*/
cksum = (cksum >> 16) + (cksum & 0xffff);
cksum += (cksum >>16);
return (USHORT)(~cksum);
}
/*填充ICMP数据报字段函数*/
void FillICMPData(char *icmp_data, int datasize)
{
IcmpHeader *icmp_hdr = NULL;
char *datapart = NULL;
icmp_hdr = (IcmpHeader*)icmp_data;
/*ICMP报文类型设置为回显请求*/
icmp_hdr->i_type = ICMP_ECHO;
icmp_hdr->i_code = 0;
/*获取当前进程IP作为标识符*/
icmp_hdr->i_id = (USHORT)GetCurrentProcessId();
icmp_hdr->i_cksum = 0;
icmp_hdr->i_seq = 0;
datapart = icmp_data + sizeof(IcmpHeader);
/*以数字0填充剩余空间*/
memset(datapart,'0',datasize-sizeof(IcmpHeader));
}
/*释放资源函数*/
void FreeRes()
{
/*关闭创建的套接字*/
if (m_socket != INVALID_SOCKET)
closesocket(m_socket);
/*释放分配的内存*/
HeapFree(GetProcessHeap(), 0, recvbuf);
HeapFree(GetProcessHeap(), 0, icmp_data);
/*注销WSAStartup()调用*/
WSACleanup();
return ;
}
/*解读IP选项头函数*/
void DecodeIPOptions(char *buf, int bytes)
{
IpOptionHeader *ipopt = NULL;
IN_ADDR inaddr;
int i;
HOSTENT *host = NULL;
/*获取路由信息的地址入口*/
ipopt = (IpOptionHeader *)(buf + 20);
printf("RR: ");
for(i = 0; i < (ipopt->ptr / 4) - 1; i++)
{
inaddr.S_un.S_addr = ipopt->addr[i];
if (i != 0)
printf(" ");
/*根据IP地址获取主机名*/
host = gethostbyaddr((char *)&inaddr.S_un.S_addr,sizeof(inaddr.S_un.S_addr), AF_INET);
/*如果获取到了主机名,则输出主机名*/
if (host)
printf("(%-15s) %s\n", inet_ntoa(inaddr), host->h_name);
/*否则输出IP地址*/
else
printf("(%-15s)\n", inet_ntoa(inaddr));
}
return;
}
/*解读ICMP报头函数*/
void DecodeICMPHeader(char *buf, int bytes, SOCKADDR_IN *from)
{
IpHeader *iphdr = NULL;
IcmpHeader *icmphdr = NULL;
unsigned short iphdrlen;
DWORD tick;
static int icmpcount = 0;
iphdr = (IpHeader *)buf;
/*计算IP报头的长度*/
iphdrlen = iphdr->h_len * 4;
tick = GetTickCount();
/*如果IP报头的长度为最大长度(基本长度是20字节),则认为有IP选项,需要解读IP选项*/
if ((iphdrlen == MAX_IP_HDR_SIZE) && (!icmpcount))
/*解读IP选项,即路由信息*/
DecodeIPOptions(buf, bytes);
/*如果读取的数据太小*/
if (bytes < iphdrlen + ICMP_MIN)
{
printf("Too few bytes from %s\n",
inet_ntoa(from->sin_addr));
}
icmphdr = (IcmpHeader*)(buf + iphdrlen);
/*如果收到的不是回显应答报文则报错*/
if (icmphdr->i_type != ICMP_ECHOREPLY)
{
printf("nonecho type %d recvd\n", icmphdr->i_type);
return;
}
/*核实收到的ID号和发送的是否一致*/
if (icmphdr->i_id != (USHORT)GetCurrentProcessId())
{
printf("someone else's packet!\n");
return ;
}
SucessFlag = TRUE;
/*输出记录信息*/
printf("%d bytes from %s:", bytes, inet_ntoa(from->sin_addr));
printf(" icmp_seq = %d. ", icmphdr->i_seq);
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