2015.05.20 Linux Hex_view Source

#include <stdio.h>
#include <pcap/pcap.h>

void Hex_view(void const *,unsigned int);

int main()
{
    char * cpNICname;
    char caErrMsg[PCAP_ERRBUF_SIZE];
    pcap_t * stpDS;
    const unsigned char * ucpData;
    struct pcap_pkthdr stInfo;

    cpNICname=pcap_lookupdev(caErrMsg);
    if(0==cpNICname)
    {
       printf("ErrMsg : [%s]\n",caErrMsg);
       return -99;
    }

    printf("NICName : [%s]\n",cpNICname);
    printf("ErrMsg : [%s]\n",caErrMsg);

    stpDS=pcap_open_live(cpNICname,1500,1,0,caErrMsg);

    ucpData=pcap_next(stpDS,&stInfo);

    Hex_view(ucpData,(16*20));

    pcap_close(stpDS);

    return 0;
}

void Hex_view(void const * vP,unsigned int uiLen)
{
    unsigned int uiCnt;
    unsigned int uiLine;
    printf("============================================================================\n");
    printf("  Address                        Hex                             ASCII\n");
    printf("----------------------------------------------------------------------------\n");
    for (uiLine = 0; uiLen > uiLine;uiLine=uiLine+16)
    {
        printf(" %08X  ", vP);
        for (uiCnt = 0; uiCnt < 16; ++uiCnt)
        {
            printf("%02X ", *((unsigned char*)vP));
            vP = (char*)vP + 1;
        }

        vP = (char*)vP - 16;

        for (uiCnt = 0; uiCnt < 16; ++uiCnt)
        {
            if (32 > *((unsigned char*)vP))
            {
                putchar('.');
            }
            else if (127 < *((unsigned char*)vP))
            {
                putchar('.');
            }
            else
            {
                printf("%c", *((unsigned char*)vP));
            }
            vP = (char*)vP + 1;
        }
        putchar('\n');
    }
    return;
}