#include <stdio.h>#include <stdlib.h>#include <string.h>#include <unistd.h>//#include <fcntl.h>#include <sys/ioctl.h>//#include <netdb.h>#include <netinet/in.h>#include <netinet/if_ether.h>#include <net/if.h>#include <arpa/inet.h>//取得本地ipvoid GetLocalIp(unsigned long *pOutIpAddress){int fd; struct ifreq ifr; struct sockaddr_in* sin; fd = socket(PF_INET, SOCK_DGRAM, 0); memset(&ifr, 0x00, sizeof(ifr)); strcpy(ifr.ifr_name, "eth0"); ioctl(fd, SIOCGIFADDR, &ifr); close(fd); sin = (struct sockaddr_in* )&ifr.ifr_addr; *pOutIpAddress = sin->sin_addr.s_addr;}unsigned long GetNetworkMask(){int fd; struct ifreq ifr; struct sockaddr_in* sin; fd = socket(PF_INET, SOCK_DGRAM, 0); memset(&ifr, 0x00, sizeof(ifr)); strcpy(ifr.ifr_name, "eth0"); ioctl(fd, SIOCGIFNETMASK, &ifr); close(fd); sin = (struct sockaddr_in* )&ifr.ifr_netmask; return sin->sin_addr.s_addr;}unsigned long GetNetworkGateway(){FILE *stream;char buf[100]; memset( buf, '/0', sizeof(buf) );stream = popen( "cat /etc/sysconfig/network-scripts/ifcfg-eth0 | grep GATEWAY", "r" );fread( buf, sizeof(char), sizeof(buf), stream); //将刚刚FILE* stream的数据流读取到buf中memmove(buf, buf + 8, 92);pclose( stream ); return inet_addr(buf);}int GetDHCPType(){FILE *stream;char buf[20]; memset( buf, '/0', sizeof(buf) );stream = popen( "cat /etc/sysconfig/network-scripts/ifcfg-eth0 | grep BOOTPROTO", "r" );fread( buf, sizeof(char), sizeof(buf), stream); //将刚刚FILE* stream的数据流读取到buf中pclose( stream ); memmove(buf, buf + 10, 10);return strncasecmp(buf, "dhcp", 4);}/********************************************************************************//** 获取本机MAC地址和IP *//********************************************************************************/void Getipaddr(struct in_addr *hostIP,unsigned char * HostMac){ int sockfd, size = 1;struct ifreq * ifr;struct ifconf ifc;struct sockaddr_in sa;unsigned char *u;#define IFRSIZE ( ( int )( size * sizeof( struct ifreq ) ) )if ( 0 > ( sockfd = socket( AF_INET, SOCK_DGRAM, IPPROTO_IP ) ) ){fprintf( stderr, "Cannot open socket./n" );return;}ifc.ifc_req = NULL;do{++size;/* realloc buffer size until no overflow occurs */if ( NULL == ( ifc.ifc_req = (ifreq *)realloc(ifc.ifc_req, IFRSIZE ))){fprintf( stderr, "Out of memory./n" );return;}ifc.ifc_len = IFRSIZE;if ( ioctl( sockfd, SIOCGIFCONF, &ifc ) ){perror( "ioctl SIOCFIFCONF" );return ;}} while ( IFRSIZE <= ifc.ifc_len );ifr = ifc.ifc_req;for ( ; ( char * )ifr < ( char * )ifc.ifc_req + ifc.ifc_len; ++ifr ){if ( ifr->ifr_addr.sa_data == ( ifr + 1 )->ifr_addr.sa_data ){continue; /* duplicate, skip it */}if ( ioctl( sockfd, SIOCGIFFLAGS, ifr ) ){continue; /* failed to get flags, skip it */}if(strcmp(ifr->ifr_name,"eth0") == 0)//,sizeof(ifr.ifr_name)-1打印eth0的IP{*hostIP = ((struct sockaddr_in*)(&(ifr->ifr_addr)))->sin_addr;}if ( 0 == ioctl( sockfd, SIOCGIFHWADDR, ifr ) ){switch ( ifr->ifr_hwaddr.sa_family ){case ARPHRD_NETROM:case ARPHRD_ETHER:case ARPHRD_PPP:case ARPHRD_EETHER:case ARPHRD_IEEE802:break;default:printf( "/n" );continue;}u = ( unsigned char * )&ifr->ifr_addr.sa_data; //取得MAC地址 if ( u[0] + u[1] + u[2] + u[3] + u[4] + u[5] ){printf( "HW Address: %2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x/n",u[0], u[1], u[2], u[3], u[4], u[5] );}if(strcmp(ifr->ifr_name, "eth0") == 0)//,sizeof(ifr.ifr_name)-1打印eth0的IPmemcpy(HostMac,u,6); }} /* end of for */close( sockfd );return;}int Openintf(char *nt_card){int fd;struct ifreq ifr; /*接口请求结构，用来调用在I/O输入输出时使用*/int sign;fd = socket(AF_INET, SOCK_PACKET, htons(/*0x0806*/0x0003)); //wrtie也出错/*0x0800是IP,0x0806是ARP,0x8035是RARP,0x0003是任何都可以*/ if(fd < 0){perror("cant get SOCK_PACKET socket");return(-1);}strcpy(ifr.ifr_name, nt_card);sign = ioctl(fd, SIOCGIFFLAGS, &ifr); /*读取标志位*/if(sign < 0){close(fd);perror("cant get flags");return(-1);}ifr.ifr_flags |= IFF_PROMISC; /*设置标志位为混杂模式,sniffer是在这种模式下工作的*/ifr.ifr_flags |= ~IFF_NOARP; //sign = ioctl(fd, SIOCSIFFLAGS, &ifr); /*写入标志位*/if(sign < 0){perror("cant set promiscuous mode");}return fd;}int main(int argc, char *argv[]){//get ipaddrunsigned long ipAddr;GetLocalIp(&ipAddr);char strip[5];memset(strip,0x0,5);memcpy(strip,(void*)&ipAddr,4);for(int i = 0 ; i < 4 ; i++ ){printf(" %3d ",0xff&strip[i]);}printf("/r/n");//get networkmaskipAddr = GetNetworkMask();memset(strip,0x0,5);memcpy(strip,(void*)&ipAddr,4);for(int i = 0 ; i < 4 ; i++ ){printf(" %3d ",0xff&strip[i]);}printf("/r/n");//get network GatewayipAddr = GetNetworkGateway();memset(strip,0x0,5);memcpy(strip,(void*)&ipAddr,4);for(int i = 0 ; i < 4 ; i++ ){printf(" %3d ",0xff&strip[i]);}printf("/r/n");//get dhcpint idhcp = GetDHCPType();printf("dhcp = %d /r/n",idhcp);//get ip and macstruct in_addr hostIP;unsigned char HostMac[8];Getipaddr(&hostIP,HostMac);for(int i = 0 ; i < 6 ; i++){printf(" %2x ",0xff&HostMac[i]);}printf("/r/n");ipAddr = hostIP.s_addr;memset(strip,0x0,5);memcpy(strip,(void*)&ipAddr,4);for(int i = 0 ; i < 4 ; i++ ){printf(" %3d ",0xff&strip[i]);}printf("/r/n");//ctrl eth0Openintf("eth0");return 1;}
