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Win2000中用户自定义IP头的实现及OicqSend完整实例源程序

　2006-07-04 20:27:18　来源：WEB开发网　　　

核心提示： 实现自己定义的IP头是一件非常有意义的事情，比如，Win2000中用户自定义IP头的实现及OicqSend完整实例源程序(2)，通过改变IP头里的TOS的优先级和TTL，你可以使自己的数据包有更强的传输能力和寿命，希望大家能好好利用，参考书目：《Network Programming fo

实现自己定义的IP头是一件非常有意义的事情，比如，通过改变IP头里的TOS的优先级和TTL，你可以使自己的数据包有更强的传输能力和寿命，通过修改IP头里的源IP地址就可以隐藏自己机器的IP地址等等。象著名攻击程序“泪滴TearDrop”就是通过故意制造系统不能处理的分片IP包而实现的，还有SYN Flooder和UDP Flooder就是通过产生随机源IP实现欺骗的。

三、实现原理

一般来说，自定义IP头是通过使用socket的库函数setsockopt()的选项IP_HDRINCL来实现的，尽管这在unix和linux平台上很容易实现，但遗憾的是在Windows平台的Winsock1.1和Winsock2.0函数库里setsockopt()不支持IP_HDRINCL选项，所以在Windows 9x/NT里是无法通过Winsock函数库来实现IP头自定义的，当然可以通过编写虚拟设备驱动程序来实现，不过比较复杂，但Windows 2000的出现打破了这种局面，Windows2000的Winsock2.2函数库里全面支持setsockopt()的选项IP_HDRINCL，使得我们轻松就可以实现自定义的IP头。实现方法如下：

SOCKET s;

BOOL bopt;

s=WSASocket(AF_INET, SOCK_RAW, IPPROTO_UDP, NULL, 0, WSA_FLAG_OVERLAPPED);

ret = setsockopt(s, IPPROTO_IP, IP_HDRINCL, (char *)bopt, sizeof(bopt);

四、实例

为帮助大家尽快地学会构造自己的IP头数据，特给出一个完整的实例，例子的功能是：只要给出对方的IP地址，就可以发送给对方的OICQ一个“hello!”消息，并且由于修改了发送数据包的IP头，完全实现了发送方IP地址的隐藏，也就是说稍加修改你就可以制作出一个能够完完全全的匿名OICQ发送器，当然，若是故意捣乱的话，后果自负。源代码如下：
/***********************************************************************/ /* OicqSend.c */ /* 本程序用Visual C++ 6.0编译在Windows 2000 Advanced Server 上调试通过 */ /* Created by janker@371.net 2000.8.28 */ /* 声明：本程序经修改后可能会产生攻击性擅自修改成攻击程序者后果自负 */ /***********************************************************************/ #pragma pack(1) #define WIN32_LEAN_AND_MEAN #include #include #include #include #include #define OICQ_MAX_PACKET 1024 #define OICQ_MAX_MSG 512 #define OICQ_MSG_LEN 45 #define SRC_IP "127.0.0.1" #define SRC_PORT 5277 #define DST_PORT 4000 typedef struct ip_hdr { unsigned char ip_verlen; unsigned char ip_tos; unsigned short ip_totallength; unsigned short ip_id; unsigned short ip_offset; unsigned char ip_ttl; unsigned char ip_protocol; unsigned short ip_checksum; unsigned int ip_srcaddr; unsigned int ip_destaddr; } IP_HDR; typedef struct udp_hdr { unsigned short src_portno; unsigned short dst_portno; unsigned short udp_length; unsigned short udp_checksum; } UDP_HDR; char strMessage[OICQ_MSG_LEN] = { 0x02,0x01,0x07,0x00,0x78,0x00,0x00,0x31,0x30,0x30,0x30,0x31,0x1f,0x30,0x1f, 0x30,0x30,0x1f,0x32,0x30,0x30,0x30,0x2d,0x30,0x31,0x2d,0x30,0x31,0x1f,0x30, 0x30,0x3a,0x30,0x30,0x3a,0x30,0x30,0x1f,0x68,0x65,0x6c,0x6c,0x6f,0x21,0x03 }; USHORT checksum(USHORT *buffer, int size) { unsigned long cksum=0; while (size > 1) { cksum += *buffer++; size -= sizeof(USHORT); } if (size) { cksum += *(UCHAR*)buffer; } cksum = (cksum >> 16) + (cksum & 0xffff); cksum += (cksum >>16); return (USHORT)(~cksum); } int main(int argc, char **argv) { WSADATA wsd; SOCKET s; BOOL bOpt; struct sockaddr_in remote; IP_HDR ipHdr; UDP_HDR udpHdr; int ret; DWORD i; unsigned short iTotalSize, iUdpSize, iUdpChecksumSize, iIPVersion, iIPSize, cksum = 0; char buf[OICQ_MAX_PACKET], *ptr = NULL; printf("Spoof OICQ Msg Sender - by Janker@371.net\n\n"); if(argc!=2) { printf("usage: OICQSEND Destination_IP_Address"); ExitProcess(1); } srand((unsigned)time(NULL)); strMessage[5]=rand(); if (WSAStartup(MAKEWORD(2,2), &wsd) != 0) { printf("WSAStartup() failed: %d\n", GetLastError()); return -1; } s = WSASocket(AF_INET, SOCK_RAW, IPPROTO_UDP, NULL, 0,0); if (s == INVALID_SOCKET) { printf("WSASocket() failed: %d\n", WSAGetLastError()); return -1; } bOpt = TRUE; ret = setsockopt(s, IPPROTO_IP, IP_HDRINCL, (char *)&bOpt, sizeof(bOpt)); if (ret == SOCKET_ERROR) { printf("setsockopt(IP_HDRINCL) failed: %d\n", WSAGetLastError()); return -1; } iTotalSize = sizeof(ipHdr) + sizeof(udpHdr) + OICQ_MSG_LEN; iIPVersion = 4; iIPSize = sizeof(ipHdr) / sizeof(unsigned long); ipHdr.ip_verlen = (iIPVersion << 4) | iIPSize; ipHdr.ip_tos = 0; ipHdr.ip_totallength = htons(iTotalSize); ipHdr.ip_id = 0; ipHdr.ip_offset = 0; ipHdr.ip_ttl = 128; ipHdr.ip_protocol = 0x11; ipHdr.ip_checksum = 0 ; ipHdr.ip_srcaddr = inet_addr(SRC_IP); ipHdr.ip_destaddr = inet_addr(argv[1]); iUdpSize = sizeof(udpHdr) + OICQ_MSG_LEN; udpHdr.src_portno = htons(SRC_PORT) ; udpHdr.dst_portno = htons(DST_PORT) ; udpHdr.udp_length = htons(iUdpSize) ; udpHdr.udp_checksum = 0 ; iUdpChecksumSize = 0; ptr = buf; ZeroMemory(buf, OICQ_MAX_PACKET); memcpy(ptr, &ipHdr.ip_srcaddr, sizeof(ipHdr.ip_srcaddr)); ptr += sizeof(ipHdr.ip_srcaddr); iUdpChecksumSize += sizeof(ipHdr.ip_srcaddr); memcpy(ptr, &ipHdr.ip_destaddr, sizeof(ipHdr.ip_destaddr)); ptr += sizeof(ipHdr.ip_destaddr); iUdpChecksumSize += sizeof(ipHdr.ip_destaddr); ptr++; iUdpChecksumSize += 1; memcpy(ptr, &ipHdr.ip_protocol, sizeof(ipHdr.ip_protocol)); ptr += sizeof(ipHdr.ip_protocol); iUdpChecksumSize += sizeof(ipHdr.ip_protocol); memcpy(ptr, &udpHdr.udp_length, sizeof(udpHdr.udp_length)); ptr += sizeof(udpHdr.udp_length); iUdpChecksumSize += sizeof(udpHdr.udp_length); memcpy(ptr, &udpHdr, sizeof(udpHdr)); ptr += sizeof(udpHdr); iUdpChecksumSize += sizeof(udpHdr); for(i = 0; i *ptr = strMessage[i]; iUdpChecksumSize += OICQ_MSG_LEN; cksum = checksum((USHORT *)buf, iUdpChecksumSize); udpHdr.udp_checksum = cksum; ZeroMemory(buf, OICQ_MAX_PACKET); ptr = buf; memcpy(ptr, &ipHdr, sizeof(ipHdr)); ptr += sizeof(ipHdr); memcpy(ptr, &udpHdr, sizeof(udpHdr)); ptr += sizeof(udpHdr); memcpy(ptr, strMessage, OICQ_MSG_LEN); remote.sin_family = AF_INET; remote.sin_port = htons(DST_PORT); remote.sin_addr.s_addr = inet_addr(argv[1]); ret = sendto(s, buf, iTotalSize, 0, (SOCKADDR *)&remote, sizeof(remote)); if (ret == SOCKET_ERROR) printf("sendto() failed: %d\n", WSAGetLastError()); else printf("Send O.K.!"); closesocket(s) ; WSACleanup() ; return 0; }