linux下C语言实现静态IP地址,网关的设置

来源：互联网发布：哪个天气预报软件准确编辑：程序博客网时间：2024/05/15 12:49
#include <sys/ioctl.h>#include <sys/types.h>#include <sys/socket.h>#include <netinet/in.h>#include <arpa/inet.h>#include <net/if.h>#include <error.h>#include <net/route.h>int SetIfAddr(char *ifname, char *Ipaddr, char *mask,char *gateway){    int fd;    int rc;    struct ifreq ifr;     struct sockaddr_in *sin;    struct rtentry  rt;    fd = socket(AF_INET, SOCK_DGRAM, 0);    if(fd < 0)    {            perror("socket   error");                 return -1;         }    memset(&ifr,0,sizeof(ifr));     strcpy(ifr.ifr_name,ifname);     sin = (struct sockaddr_in*)&ifr.ifr_addr;         sin->sin_family = AF_INET;         //IP地址    if(inet_aton(Ipaddr,&(sin->sin_addr)) < 0)       {             perror("inet_aton   error");             return -2;         }        if(ioctl(fd,SIOCSIFADDR,&ifr) < 0)       {             perror("ioctl   SIOCSIFADDR   error");             return -3;         }    //子网掩码    if(inet_aton(mask,&(sin->sin_addr)) < 0)       {             perror("inet_pton   error");             return -4;         }        if(ioctl(fd, SIOCSIFNETMASK, &ifr) < 0)    {        perror("ioctl");        return -5;    }    //网关    memset(&rt, 0, sizeof(struct rtentry));    memset(sin, 0, sizeof(struct sockaddr_in));    sin->sin_family = AF_INET;    sin->sin_port = 0;    if(inet_aton(gateway, &sin->sin_addr)<0)    {       printf ( "inet_aton error\n" );    }    memcpy ( &rt.rt_gateway, sin, sizeof(struct sockaddr_in));    ((struct sockaddr_in *)&rt.rt_dst)->sin_family=AF_INET;    ((struct sockaddr_in *)&rt.rt_genmask)->sin_family=AF_INET;    rt.rt_flags = RTF_GATEWAY;    if (ioctl(fd, SIOCADDRT, &rt)<0)    {        zError( "ioctl(SIOCADDRT) error in set_default_route\n");        close(fd);        return -1;    }    close(fd);    return rc;}
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