udp端口扫描程序代码.doc

1、。/ udp.cpp :定义控制台应用程序的入口点。/#include stdafx.h#include #include #pragma comment(lib, ws2_32.lib)#define MAXBUFF 8192#define ICMP_UNREACH_PORT 3#define ICMP_UNREACH 4enum CMD_NAME, DST_IP, START_PORT, LAST_PORT; structipunsigned int ip_v:4; /版本unsigned int ip_hl:4; /头部长unsigned char ip_tos; /服务类型unsign

2、ed short ip_len; /总长unsigned short ip_id; /鉴定域unsigned short ip_flags; /IP标志unsigned short ip_off; /片偏移unsigned char ip_ttl; / TTLunsigned char ip_protocol; /协议unsigned short ip_sum; /头部效验和structin_addrip_src, ip_dest; /源 ip 和目的 IP#define IP_RF 0x8000 /标记收到数据#define IP_DF 0x4000#define IP_MF 0x2000#

3、define IP_OFFMASK 0x1fff;structicmpunsigned short inticmp_type;unsigned short inticmp_code;unsigned long inticmp_cksum;unsigned long inticmp_id;unsigned long inticmp_seq;unsigned short inticmp_data1;int main(intargc, char *argv) structtimevaltv;fd_setselect_fd;char buffMAXBUFF;intdstport, startport,

4、 endport;if (argc != 4) fprintf(stdout, usage: %s目的 ip 起始端口目的端口n, argvCMD_NAME);exit(EXIT_FAILURE);。1。WSADatawsaData;WSAStartup(MAKEWORD(2,2), &wsaData);structsockaddr_insend_sa;/ 发送端地址信息memset(&send_sa, 0, sizeof(send_sa);send_sa.sin_family = AF_INET;send_sa.sin_addr.s_addr = inet_addr(argvDST_IP);

5、startport = atoi(argvSTART_PORT);endport = atoi(argvLAST_PORT);SOCKET sock_send = socket(AF_INET, SOCK_DGRAM, 0);/ 发送用的描述符if (sock_send 0) perror( sock(SOCK_DGRAM);closesocket(sock_send);exit(EXIT_FAILURE);SOCKET sock_recv = socket(AF_INET, SOCK_RAW, IPPROTO_ICMP); /接收用的描述符if (sock_recv 0) perror( s

6、ocket(SOCK_RAW);closesocket(sock_recv);exit(EXIT_FAILURE);for (dstport = startport; dstport 0) structip *ip;structicmp *icmp;inthlen;int port;memset(&ip, 0, sizeof(ip);if (recvfrom(sock_recv, buff, MAXBUFF, 0, NULL, NULL) != 56)continue;ip = (structip *)buff;hlen = ip-ip_hlip_src.s_addr!=send_sa.sin_addr.s_addr)|(icmp-icmp_type!=ICMP_UNREACH)|(icmp-icmp_code != ICMP_UNREACH_PORT) | (port != dstport)continue;else structservent *se;se = getservbyport(htons(dstport), udp);if (se != NULL)printf(%5d %-20sn, dstport, (se = NULL) ? unknown: se-s_name);break;closesocket(sock_send