linux下C语言实现静态IP地址,网关的设置
linux下C语言实现静态IP地址,网关的设置#include #include #include #include #include #include #include #include int SetIfAddr(char *ifname, char *Ipaddr, char *mask,ch
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- #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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