Welcome to my blog -- ZwelL

unsigned long resolv(char*host)
{
    struct hostent             *hp;
    unsigned long              host_ip;
    
    host_ip = inet_addr(host);
    if( host_ip == INADDR_NONE )
    {
        hp = gethostbyname(host);
        if(!hp)
        {
            //printf("\nError: Unable to resolve hostname (%s)\n",host);
            exit(1);
        }
        else
            host_ip = *(u_long*)hp->h_addr ;
    }

    return(host_ip);
}

//校验和算法

unsigned short checksum(unsigned short*buffer,int size)
{
    unsigned long cksum=0 ;
    while(size>1)
    {
        cksum+=*buffer++;
        size-=sizeof(unsigned short);
    }
   
    if(size)
            cksum+=*(UCHAR*)buffer ;
    cksum=(cksum>>16)+(cksum&0xffff);
    cksum+=(cksum>>16);

    return(unsigned short)(~cksum);
}

//校验和算法:汇编

USHORT checksum(USHORT *_lpsz, int _dwSize)
{
    __asm
    {
        mov ecx,_dwSize
            shr ecx,1
            xor ebx,ebx
            mov esi,_lpsz
            cld
aa:
        lodsw
            movzx eax,ax
            add ebx,eax
            loop aa
            test _dwSize,1
            jz bb
            lodsb
            movzx eax,al
            add ebx,eax
bb:
        mov eax,ebx
            and eax,0ffffh
            shr ebx,16
            add eax,ebx
            not ax
            mov rerere,eax
    }
    return(rerere);
}

/*++
函数说明:
  打印16进制函数

参数:

  data - 要打印的缓冲区
  amount - 要打印的大小
  address - 显示的初始地址

--*/

void hexdump(unsigned char *data, unsigned int amount, DWORD address=-1)
{
    unsigned int      dp, p;
    const char        trans[] =
        "................................ !\"#$%&'()*+,-./0123456789"
        ":;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`abcdefghijklm"
        "nopqrstuvwxyz{|}~...................................."
        "....................................................."
        "........................................";

    if(address!=-1)
        printf("%08x : ", address);
    for (dp = 1; dp <= amount; dp++) 
    {
        printf ("%02x ", data[dp-1]);
        if ((dp % 8) == 0)
            printf (" ");
        if ((dp % 16) == 0)
        {
            printf ("| ");
            p = dp;
            for (dp -= 16; dp < p; dp++)
                printf ("%c", trans[data[dp]]);
            printf ("\n");
            if(address!=-1)
                printf("%08x : ", address+=16);
        }
    }
    if ((amount % 16) != 0)
    {
        p = dp = 16 - (amount % 16);
        for (dp = p; dp > 0; dp--)
        {
            printf ("   ");
            if (((dp % 8) == 0) && (p != 8))
                printf (" ");
        }
        printf (" | ");
        for (dp = (amount - (16 - p)); dp < amount; dp++)
            printf ("%c", trans[data[dp]]);
    }
    printf ("\n");
    return ;
}

/**

函数说明:
  获取到达指定IP的下一跳地址

参数:

附: 需要使用iphlpapi头文件和库

#include "iphlpapi.h"
#pragma comment(lib,"iphlpapi")

调用时:
in_addr             ia;
ia.S_un.S_addr = GetNextHopFormIp("192.168.1.1");
printf("NextHop: %s\n", inet_ntoa(ia));

**/
ULONG GetNextHopFormIp(char *ip)
{
    MIB_IPFORWARDROW BestRoute;
   
    DWORD dwRes = GetBestRoute(inet_addr(ip), 0, &BestRoute);
    if(dwRes == ERROR_SUCCESS)
    {
       
        return BestRoute.dwForwardNextHop;
    }
    return 0;
}

/**

BCB中用的函数, 在string中获取两段字符中间的字符

如有字符串"HOST : ZWELL.3322.ORG\r\n",

调用函数GetTextBetween("HOST : ZWELL.3322.ORG\r\n", "HOST : ", "\r\n")

则返回ZWELL.3322.ORG
**/
AnsiString GetTextBetween(AnsiString string, AnsiString startstr, AnsiString endstr)
{
    //如果参数长度有任意一个为0则跳出
    if(string.Length()<0 || startstr.Length()<0 || endstr.Length()<0)
        return FALSE;

    //如果未找到起始字符, 则跳出
    int postion = string.Pos(startstr);
    if(postion<1)
        return FALSE;
    string = string.SubString(postion+startstr.Length(), string.Length());

    //如果未找到终止字符, 则跳出
    postion = string.Pos(endstr);
    if(postion<1)
        return FALSE;
    string = string.SubString(1, postion);

    return string;
}

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