Linux下C语言获取和修改本机IP地址

<pre name="code" class="cpp"><pre name="code" class="cpp">/** 头文件*/#ifndef _GET_IP_H#define _GET_IP_Hextern char *get_ip(char *ip);extern int set_hand_ip(const char *ip);extern int check_right_ip(const char *ip);#endif//==============================================================<pre name="code" class="cpp">/** 源代码*/

#include<stdio.h>#include<stdlib.h>#include<unistd.h>#include<string.h>#include<sys/types.h>#include<arpa/inet.h>#include<net/if.h>#include<string.h>#include<signal.h>#include<sys/wait.h>#include<sys/ioctl.h>#include<regex.h>#define ETH_NAME "eth0"///************************************************************** 函数功能：通过正则表达式检测是否为IP地址* 参数类型：需要检测的IP地址* 返回类型：成功返回0，失败返回-1**************************************************************/int check_right_ip(const char *ip){    int status = 0;int cflags = REG_EXTENDED;regmatch_t pmatch[1];const size_t nmatch = 1;regex_t reg;char str_ip[30] = "";const char *pattern = "[0-9]{1,3}[.][0-9]{1,3}[.][0-9]{1,3}[.][0-9]{1,3}";//存在局限    strcpy(str_ip,ip);regcomp(&reg, pattern, cflags);status = regexec(&reg,str_ip,nmatch,pmatch,0);if(status==REG_NOMATCH){        printf("No match\n");return -1;}else if(status==0){        return 0;}regfree(&reg);return 0;}/************************************************************** 函数功能：获取IP地址* 参数类型：IP地址存放位置* 返回类型：**************************************************************/char *get_ip(char *ip){    int sock;    struct sockaddr_in sin;    struct ifreq ifr;char *temp_ip = NULL;        sock = socket(AF_INET, SOCK_DGRAM, 0);    if (sock == -1)    {        perror("socket");        return NULL;                    }    strncpy(ifr.ifr_name, ETH_NAME, IFNAMSIZ-1);    ifr.ifr_name[IFNAMSIZ - 1] = 0;        if (ioctl(sock, SIOCGIFADDR, &ifr) < 0)    {        perror("ioctl");        return NULL;    }    memcpy(&sin, &ifr.ifr_addr, sizeof(sin));temp_ip = inet_ntoa(sin.sin_addr);strcpy(ip,temp_ip);    fprintf(stdout, "eth0: %s\n", temp_ip);return ip;}/************************************************************** 函数功能：手动设置IP地址* 参数类型：要设置的IP地址* 返回类型：成功返回0，失败返回-1**************************************************************/int set_hand_ip(const char *ipaddr){int sock_set_ip;         struct sockaddr_in sin_set_ip;         struct ifreq ifr_set_ip;         memset( &ifr_set_ip,0,sizeof(ifr_set_ip));         if( ipaddr == NULL )         {        return -1;         }   sock_set_ip = socket( AF_INET, SOCK_STREAM, 0 );//printf("sock_set_ip=====%d\n",sock_set_ip);    if(sock_set_ip<0)      {             perror("socket create failse...SetLocalIp!");             return -1;         }         memset( &sin_set_ip, 0, sizeof(sin_set_ip));         strncpy(ifr_set_ip.ifr_name, ETH_NAME, 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));         printf("ipaddr===%s\n",ipaddr);    if( ioctl( sock_set_ip, SIOCSIFADDR, &ifr_set_ip) < 0 )         {             perror( "Not setup interface");             return -1;         }         //设置激活标志          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 -1;         }             close( sock_set_ip );     return 0;}