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的C语言实现

来源:http://www.dfwstonefabricators.com 作者:编程应用 人气:80 发布时间:2019-09-28
摘要:转载自 // Ping.c// Ping [host] [packet-size]//// host String name of host to ping// packet-size Integer size of packet to send// (smaller than 1024 bytes)#define WIN32_LEAN_AND_MEAN#include winsock2.h#include ws2tcpip.h#include stdio.h#i

转载自

// Ping.c

//     Ping [host] [packet-size]

//

//     host         String name of host to ping

//     packet-size  Integer size of packet to send

//                      (smaller than 1024 bytes)

#define WIN32_LEAN_AND_MEAN

#include <winsock2.h>

#include <ws2tcpip.h>

#include <stdio.h>

#include <stdlib.h>

#pragma comment(lib,"ws2_32.lib")

#define IP_RECORD_ROUTE  0x7

typedef struct _iphdr {

unsigned int   h_len:

    4;       // Length of the header

unsigned int   version:

    4;     // Version of IP

    unsigned char  tos;            // Type of service

    unsigned short total_len;      // Total length of the packet

    unsigned short ident;          // Unique identifier

    unsigned short frag_and_flags; // Flags

    unsigned char  ttl;            // Time to live

    unsigned char  proto;          // Protocol (TCP, UDP etc)

    unsigned short checksum;       // IP checksum

    unsigned int   sourceIP;

    unsigned int   destIP;

} IpHeader;

#define ICMP_ECHO        8

#define ICMP_ECHOREPLY   0

#define ICMP_MIN         8 // Minimum 8-byte ICMP packet 

typedef struct _icmphdr {

    BYTE   i_type;

    BYTE   i_code;                 // Type sub code

    USHORT i_cksum;

    USHORT i_id;

    USHORT i_seq;

    ULONG  timestamp;

} IcmpHeader;

typedef struct _ipoptionhdr {

    unsigned char        code;        // Option type

    unsigned char        len;         // Length of option hdr

    unsigned char        ptr;         // Offset into options

    unsigned long        addr[9];     // List of IP addrs

} IpOptionHeader;

#define DEF_PACKET_SIZE  32        // Default packet size

#define MAX_PACKET       1024      // Max ICMP packet size

#define MAX_IP_HDR_SIZE  60        // Max IP header size w/options

BOOL  bRecordRoute;

int   datasize;

char *lpdest;

void usage(char *progname) 

{

    printf("usage: ping -r <host> [data size]/n");

    printf("       -r           record route/n");

    printf("        host        remote machine to ping/n");

    printf("        datasize    can be up to 1KB/n");

    ExitProcess;

}

void FillICMPData(char *icmp_data, int datasize) 

{

    IcmpHeader *icmp_hdr = NULL;

    char *datapart = NULL;

    icmp_hdr = (IcmpHeader*)icmp_data;

    icmp_hdr->i_type = ICMP_ECHO;        // Request an ICMP echo

    icmp_hdr->i_code = 0;

    icmp_hdr->i_id = GetCurrentProcessId();

    icmp_hdr->i_cksum = 0;

    icmp_hdr->i_seq = 0;

    datapart = icmp_data + sizeof(IcmpHeader);

    //

    // Place some junk in the buffer

    //

    memset(datapart,'E', datasize - sizeof(IcmpHeader));

}

USHORT checksum(USHORT *buffer, int size) 

{

    unsigned long cksum=0;

    while (size > 1) {

        cksum += *buffer++;

        size -= sizeof;

    }

    if  {

        cksum += *buffer;

    }

    cksum = (cksum >> 16) + (cksum & 0xffff);

    cksum += (cksum >>16);

    return ;

}

void DecodeIPOptions(char *buf, int bytes) 

{

    IpOptionHeader *ipopt = NULL;

    IN_ADDR inaddr;

    int i;

    HOSTENT *host = NULL;

    ipopt = (IpOptionHeader *);

    printf("RR:   ");

    for (i = 0; i < (ipopt->ptr / 4) - 1; i++) {

        inaddr.S_un.S_addr = ipopt->addr[i];

        if 

            printf("      ");

        host = gethostbyaddr((char *)&inaddr.S_un.S_addr,

                             sizeof(inaddr.S_un.S_addr), AF_INET);

        if 

            printf(" %s/n", inet_ntoa, host->h_name);

        else

            printf("/n", inet_ntoa;

    }

    return;

}

void DecodeICMPHeader(char *buf, int bytes, struct sockaddr_in *from) 

{

    IpHeader       *iphdr = NULL;

    IcmpHeader     *icmphdr = NULL;

    unsigned short  iphdrlen;

    DWORD           tick;

    static   int    icmpcount = 0;

    iphdr = (IpHeader *)buf;

    // Number of 32-bit words * 4 = bytes

    iphdrlen = iphdr->h_len * 4;

    tick = GetTickCount();

    if ((iphdrlen == MAX_IP_HDR_SIZE) && (!icmpcount))

        DecodeIPOptions(buf, bytes);

    if (bytes  < iphdrlen + ICMP_MIN) {

        printf("Too few bytes from %s/n",

               inet_ntoa(from->sin_addr));

    }

    icmphdr = (IcmpHeader*)(buf + iphdrlen);

    if (icmphdr->i_type != ICMP_ECHOREPLY) {

        printf("nonecho type %d recvd/n", icmphdr->i_type);

        return;

    }

    // Make sure this is an ICMP reply to something we sent!

    //

    if (icmphdr->i_id != GetCurrentProcessId {

        printf("someone else's packet!/n");

        return ;

    }

    printf("%d bytes from %s:", bytes, inet_ntoa(from->sin_addr));

    printf(" icmp_seq = %d. ", icmphdr->i_seq);

    printf(" time: %lu ms", tick - icmphdr->timestamp);

    printf("/n");

    icmpcount++;

    return;

}

void ValidateArgs(int argc, char **argv) 

{

    int     i;

    bRecordRoute = FALSE;

    lpdest = NULL;

    datasize = DEF_PACKET_SIZE;

    for (i = 1; i < argc; i++) {

        if ((argv[i][0] == '-') || (argv[i][0] == '/')) {

            switch (tolower(argv[i][1])) {

            case 'r':        // Record route option

                bRecordRoute = TRUE;

                break;

            default:

                usage;

                break;

            }

        } else if (isdigit(argv[i][0]))

            datasize = atoi;

        else

            lpdest = argv[i];

    }

}

int main(int argc, char **argv) 

{

    WSADATA wsaData;

    SOCKET sockRaw = INVALID_SOCKET;

    struct sockaddr_in dest;

    struct sockaddr_in from;

    int bread;

    int fromlen = sizeof;

    int timeout = 1000;

    int ret;

    char *icmp_data = NULL;

    char *recvbuf = NULL;

    USHORT seq_no = 0;

    struct hostent *hp = NULL;

    IpOptionHeader ipopt;

    if (WSAStartup(MAKEWORD, &wsaData) != 0) {

        printf("WSAStartup() failed: %ld/n", GetLastError;

        return -1;

    }

    ValidateArgs(argc, argv);

    sockRaw = WSASocket (AF_INET, SOCK_RAW, IPPROTO_ICMP, NULL, 0,

                         WSA_FLAG_OVERLAPPED);

    if (sockRaw == INVALID_SOCKET) {

        printf("WSASocket() failed: %d/n", WSAGetLastError;

        return -1;

    }

    if (bRecordRoute) {

        // Setup the IP option header to go out on every ICMP packet

        //

        ZeroMemory(&ipopt, sizeof;

        ipopt.code = IP_RECORD_ROUTE; // Record route option

        ipopt.ptr  = 4;               // Point to the first addr offset

        ipopt.len  = 39;              // Length of option header

        ret = setsockopt(sockRaw, IPPROTO_IP, IP_OPTIONS,

                         (char *)&ipopt, sizeof;

        if (ret == SOCKET_ERROR) {

            printf("setsockopt(IP_OPTIONS) failed: %d/n",

                   WSAGetLastError;

        }

    }

    bread = setsockopt(sockRaw, SOL_SOCKET, SO_RCVTIMEO,

                       (char*)&timeout, sizeof;

    if (bread == SOCKET_ERROR) {

        printf("setsockopt(SO_RCVTIMEO) failed: %d/n",

               WSAGetLastError;

        return -1;

    }

    timeout = 1000;

    bread = setsockopt(sockRaw, SOL_SOCKET, SO_SNDTIMEO,

                       (char*)&timeout, sizeof;

    if (bread == SOCKET_ERROR) {

        printf("setsockopt(SO_SNDTIMEO) failed: %d/n",

               WSAGetLastError;

        return -1;

    }

    memset(&dest, 0, sizeof;

    dest.sin_family = AF_INET;

    if ((dest.sin_addr.s_addr = inet_addr == INADDR_NONE) {

        if ((hp = gethostbyname != NULL) {

            memcpy(&(dest.sin_addr), hp->h_addr, hp->h_length);

            dest.sin_family = hp->h_addrtype;

            printf("dest.sin_addr = %s/n", inet_ntoa(dest.sin_addr));

        } else {

            printf("gethostbyname() failed: %d/n",

                   WSAGetLastError;

            return -1;

        }

    }

    datasize += sizeof(IcmpHeader);

    icmp_data = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY,

                          MAX_PACKET);

    recvbuf = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY,

                        MAX_PACKET);

    if (!icmp_data) {

        printf("HeapAlloc() failed: %ld/n", GetLastError;

        return -1;

    }

    memset(icmp_data,0,MAX_PACKET);

    FillICMPData(icmp_data,datasize);

    while  {

        static int nCount = 0;

        int        bwrote;

        if (nCount++ == 4)

            break;

        ((IcmpHeader*)icmp_data)->i_cksum = 0;

        ((IcmpHeader*)icmp_data)->timestamp = GetTickCount();

        ((IcmpHeader*)icmp_data)->i_seq = seq_no++;

        ((IcmpHeader*)icmp_data)->i_cksum =

            checksumicmp_data, datasize);

        bwrote = sendto(sockRaw, icmp_data, datasize, 0,

                        (struct sockaddr*)&dest, sizeof;

        if (bwrote == SOCKET_ERROR) {

            if (WSAGetLastError() == WSAETIMEDOUT) {

                printf("timed out/n");

                continue;

            }

            printf("sendto() failed: %d/n", WSAGetLastError;

            return -1;

        }

        if (bwrote < datasize) {

            printf("Wrote %d bytes/n", bwrote);

        }

        bread = recvfrom(sockRaw, recvbuf, MAX_PACKET, 0,

                         (struct sockaddr*)&from, &fromlen);

        if (bread == SOCKET_ERROR) {

            if (WSAGetLastError() == WSAETIMEDOUT) {

                printf("timed out/n");

                continue;

            }

            printf("recvfrom() failed: %d/n", WSAGetLastError;

            return -1;

        }

        DecodeICMPHeader(recvbuf, bread, &from);

        Sleep;

    }

    if (sockRaw != INVALID_SOCKET)

        closesocket;

    HeapFree(GetProcessHeap(), 0, recvbuf);

    HeapFree(GetProcessHeap(), 0, icmp_data);

    WSACleanup();

    return 0;

}

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