linux下C语言实现静态IP地址,网关的设置
2016-03-03 10:09
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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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