udp端口扫描程序代码.doc

。/ 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 4 enum CMD_NAME, DST_IP, START_PORT, LAST_PORT; structip unsigned int ip_v:4; / 版本unsigned int ip_hl:4; / 头部长unsigned char ip_tos; / 服务类型unsigned 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; / TTL unsigned 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 #define IP_OFFMASK 0x1fff ; structicmp unsigned 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, 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); 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); 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( socket(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_s