linux 利用ioctl函数获取IP地址、子网掩码、MAC地址和修改本机IP地址、子网掩码、网关

ioctl函数原型：

int ioctl(int fd, int request, ..../*void *arg*/)

int fd：为socket函数返回值

int request：SIOCSIFADDR 修改ip地址

                    SIOCSIFNETMASK 修改子网掩码

                    SIOCADDRT  修改网关

第三个参数：ip和子网掩码对应的结构体struct  ifreq；网关的结构体struct rtentry

//.h

#include <stdlib.h>#include <string.h>#include <pcap.h> #include <sys/types.h>#include <sys/socket.h>  #include <netinet/in.h> #include <netinet/ip.h>#include <netinet/ether.h> #include <net/if.h>  #include <arpa/inet.h> #include <net/if_arp.h>    #include <sys/ioctl.h> #include <string.h>  #include <errno.h> #include <unistd.h> #include <net/route.h>

//.cpp 修改ip地址

bool SetLocalIp(char *ipaddr)  {      if (NULL == ipaddr)    {        printf("SetLocalIp: ipaddr is null\n");        return false;    }      int sock_set_ip;            struct sockaddr_in sin_set_ip;      struct ifreq ifr_set_ip;        bzero( &ifr_set_ip,sizeof(ifr_set_ip));         if( ipaddr == NULL )          return false;      if(sock_set_ip = socket(PF_INET, SOCK_STREAM, 0 ) == -1);      {          perror("socket create failse...SetLocalIp!/n");          return false;      }        memset( &sin_set_ip, 0, sizeof(sin_set_ip));      strncpy(ifr_set_ip.ifr_name, "eth0", sizeof(ifr_set_ip.ifr_name)-1);               sin_set_ip.sin_family = AF_INET;      sin_set_ip.sin_addr.s_addr = inet_addr(ipaddr);      memcpy( &ifr_set_ip.ifr_addr, &sin_set_ip, sizeof(sin_set_ip));        if( ioctl( sock_set_ip, SIOCSIFADDR, &ifr_set_ip) < 0 )      {          perror( "Not setup interface/n");          return false;      }         ifr_set_ip.ifr_flags |= IFF_UP |IFF_RUNNING;        //get the status of the device      if( ioctl( sock_set_ip, SIOCSIFFLAGS, &ifr_set_ip ) < 0 )      {           perror("SIOCSIFFLAGS");           return false;      }        close( sock_set_ip);        return true;  }

//.cpp 修改子网掩码

bool SetLocalNetMask(char *netMask){    int socketfd;        if (NULL == netMask)    {        printf("SetLocalNetMask: netMask is null\n");        return false;    }    if(socketfd = socket(PF_INET, SOCK_STREAM, 0 ) == -1);      {          perror("socket create failse...SetLocalNetMask!/n");          return false;      }     struct ifreq ifr_mask;    struct sockaddr_in *sin_net_mask;    memset(&ifr_mask, 0, sizeof(ifr_mask));    strncpy(ifr_mask.ifr_name, "eth0", sizeof(ifr_mask.ifr_name) - 1);    sin_net_mask = (struct sockaddr_in *)&ifr_mask.ifr_addr;    sin_net_mask->sin_family = AF_INET;    inet_pton(AF_INET, netMask, &sin_net_mask->sin_addr);    if (ioctl(socketfd, SIOCSIFNETMASK, &ifr_mask) < 0)    {        printf("socket_netmask ioctl error!\n");        return false;    }    close( socketfd );        return true;}

//.cpp 修改网关

bool SetLocalRoute(char *szGateWay){    int sockfd;        sockfd = socket(AF_INET, SOCK_DGRAM, 0);    if (sockfd == -1)    {        return false;    }    struct rtentry rmten;    struct sockaddr_in ic_gateway ;// Gateway IP address     int err;        memset(&rmten, 0, sizeof(rmten));           ic_gateway.sin_family = AF_INET;     ic_gateway.sin_addr.s_addr = inet_addr(szGateWay);    ic_gateway.sin_port = 0;     ((struct sockaddr_in*)&rmten.rt_dst)->sin_family = AF_INET;    ((struct sockaddr_in*)&rmten.rt_dst)->sin_addr.s_addr = 0;    ((struct sockaddr_in*)&rmten.rt_dst)->sin_port = 0;    ((struct sockaddr_in*)&rmten.rt_genmask)->sin_family = AF_INET;    ((struct sockaddr_in*)&rmten.rt_genmask)->sin_addr.s_addr = 0;    ((struct sockaddr_in*)&rmten.rt_genmask)->sin_port = 0;    memcpy((void *) &rmten.rt_gateway, &ic_gateway, sizeof(ic_gateway));    rmten.rt_flags = RTF_UP | RTF_GATEWAY;        if ((err = ioctl(sockfd, SIOCADDRT, &rmten)) < 0)     {        printf("ioctl net error!\n");        return false;    }    close( sockfd );    return true;}

//.cpp 获得IP地址、子网掩码、MAC物理地址

bool GetIpMacMaskAddress(){    unsigned char ipaddress[INET_MACADDRESSLEN];        unsigned char macaddress[INET_MACADDRESSLEN];    unsigned char netmask[INET_MACADDRESSLEN];        struct ifreq struReq;    memset(&struReq, 0x00, sizeof(struct ifreq));    strncpy(struReq.ifr_name, "eth0", sizeof(struReq.ifr_name));          socketfd = socket(PF_INET, SOCK_STREAM, 0);        if (-1 == ioctl(socketfd, SIOCGIFHWADDR, &struReq))    {        printf("ioctl hwaddr error!\n");        return false;    }    strcpy((char *)macaddress, ether_ntoa((ether_addr*)struReq.ifr_hwaddr.sa_data));     if (-1 == ioctl(socketfd, SIOCGIFADDR, &struReq))    {        printf("ioctl ip address error!\n");        return false;    }    strcpy((char *)ipaddress, inet_ntoa(((struct sockaddr_in *)&(struReq.ifr_addr))->sin_addr));    if (-1 == ioctl(socketfd, SIOCGIFNETMASK, &struReq))    {        printf("ioctl net mask error!\n");        exit(1);    }    strcpy((char *)netmask, inet_ntoa(((struct sockaddr_in *)&(struReq.ifr_netmask))->sin_addr));        printf("MacAddress: %s\n", macaddress);    printf("IpAddress: %s\n", ipaddress);    printf("NetMask: %s\n",netmask);    close(socketfd);    return true;   }