/*Linux ifconfig,c简易源代码*/#include <sys/ioctl.h>#include <net/if.h>#include <sys/socket.h>#include <sys/types.h>#include <stdio.h>#include <netinet/in.h>int info_list(int all);int get_interface_info(char * interface_name);int set_interface(char * interface_name);int get_ipaddr(char * interface_name);int get_mac(char * interface_name);int get_netmask(char * interface_name);int get_broadcast(char * interface_name);int set_ipaddr(char * interface_name,char * ip);int set_mac(char * interface_name,char * mac);int set_netmask(char * interface_name,char * netmask);int set_broadcast(char * interface_name,char * broadcast);int interface_up(char * interface_name);int interface_down(char * interface_name);int usage();int main(int argc,char * argv[]){ if(argc == 1) { info_list(0); return 0; } if(argc == 2) { if(strcmp(argv[1],"all") == 0) { info_list(1); return 0; } get_interface_info(argv[1]); return 0; } if(argc == 3) { if(strcmp(argv[2],"set") == 0) { set_interface(argv[1]); return 0; } if(strcmp(argv[2],"up") == 0) { interface_up(argv[1]); return 0; } if(strcmp(argv[2],"down") == 0) { interface_down(argv[1]); return 0; } usage(); return 0; } usage(); return 0;}int info_list(int all){ int len; char *ifreq_pointer; len = 10*sizeof(struct ifreq); ifreq_pointer = (char *)malloc(len); struct ifconf get_info; get_info.ifc_len = len; get_info.ifc_ifcu.ifcu_buf = ifreq_pointer; int sockfd; sockfd = socket(PF_INET,SOCK_STREAM,0); ioctl(sockfd,SIOCGIFCONF,&get_info); int count; //获取网络接口数 count = get_info.ifc_len / sizeof(struct ifreq); struct sockaddr_in * return_sockaddr; struct ifreq * result = (struct ifreq *)ifreq_pointer; int i = 0; //获取myifconfig all的参数 if(all == 1) for(i;i<count;i++) { printf("%s\n",result[i].ifr_name); get_ipaddr(result[i].ifr_name); get_mac(result[i].ifr_name); get_netmask(result[i].ifr_name); get_broadcast(result[i].ifr_name); } else { struct ifreq tmp; int s; if((s = socket(PF_INET,SOCK_STREAM,0)) < 0) { perror("Socket"); exit(-1); } //获取每个接口参数 for(i;i<count;i++) { strcpy(tmp.ifr_name,result[i].ifr_name); if(ioctl(s,SIOCGIFFLAGS,&tmp) < 0) { perror("ioctl"); exit(-1); } if((tmp.ifr_ifru.ifru_flags & IFF_UP) == 0) continue; printf("%s\n",tmp.ifr_name); get_ipaddr(tmp.ifr_name); get_mac(tmp.ifr_name); get_netmask(tmp.ifr_name); get_broadcast(tmp.ifr_name); } } exit(0);}//获取IP：SIOCGIFADDRint get_ipaddr(char * interface_name){ int s; if((s = socket(PF_INET,SOCK_STREAM,0)) < 0) { perror("Socket"); return -1; } struct ifreq ifr; strcpy(ifr.ifr_name,interface_name); if(ioctl(s,SIOCGIFADDR,&ifr) < 0) { perror("ioctl"); return -1; } struct sockaddr_in * ptr; ptr = (struct sockaddr_in *)&ifr.ifr_ifru.ifru_addr; printf(" IP:%s\n",inet_ntoa(ptr->sin_addr)); return 0;}//获取MAC：SIOCGIFHWADDRint get_mac(char * interface_name){ if(strcmp(interface_name,"lo") == 0) { return 0; } int s; if((s = socket(PF_INET,SOCK_STREAM,0)) < 0) { perror("Socket"); return -1; } struct ifreq ifr; strcpy(ifr.ifr_name,interface_name); if(ioctl(s,SIOCGIFHWADDR,&ifr) != 0) { perror("ioctl"); return -1; } u_char * ptr; ptr =(u_char *)&ifr.ifr_ifru.ifru_hwaddr.sa_data[0]; printf(" MAC:%02x-%02x-%02x-%02x-%02x-%02x\n",*ptr,*(ptr+1),*(ptr+2),*(ptr+3),*(ptr+4),*(ptr+5)); return 0;}//获取netmask：SIOCGIFNETMASKint get_netmask(char * interface_name){ int s; if((s = socket(PF_INET,SOCK_STREAM,0)) < 0) { perror("Socket"); return -1; } struct ifreq ifr; strcpy(ifr.ifr_name,interface_name); if(ioctl(s,SIOCGIFNETMASK,&ifr) < 0) { perror("ioctl"); return -1; } struct sockaddr_in * ptr; ptr = (struct sockaddr_in *)&ifr.ifr_ifru.ifru_netmask; printf(" Netmask:%s\n",inet_ntoa(ptr->sin_addr)); return 0;}//获取广播地址:SIOCGIFBRDADDRint get_broadcast(char * interface_name){ int s; if((s = socket(PF_INET,SOCK_STREAM,0)) < 0) { perror("Socket"); return -1; } struct ifreq ifr; strcpy(ifr.ifr_name,interface_name); if(ioctl(s,SIOCGIFBRDADDR,&ifr) < 0) { perror("ioctl"); return -1; } struct sockaddr_in * ptr; ptr = (struct sockaddr_in *)&ifr.ifr_ifru.ifru_broadaddr; printf(" Broadcast:%s\n",inet_ntoa(ptr->sin_addr)); return 0;}//获取接口信息int get_interface_info(char * interface_name){ get_ipaddr(interface_name); get_mac(interface_name); get_netmask(interface_name); get_broadcast(interface_name); return 0;}//设置接口信息int set_interface(char * interface_name){ char ip[18]; char mac_addr[20]; char netmask[18]; char broadcast[18]; printf("Change "); get_ipaddr(interface_name); printf("To: "); fgets(ip,17,stdin); if(strcmp(ip,"\n") == 0) goto set_mac; set_ipaddr(interface_name,ip);set_mac: printf("Change "); get_mac(interface_name); printf("To: "); fgets(mac_addr,19,stdin); if(strcmp(mac_addr,"\n") == 0) goto set_netmask; set_mac(interface_name,mac_addr);set_netmask: printf("Change "); get_netmask(interface_name); printf("To: "); fgets(netmask,17,stdin); if(strcmp(netmask,"\n") == 0) goto set_broadcast; set_netmask(interface_name,netmask);set_broadcast: printf("Change "); get_broadcast(interface_name); printf("To: "); fgets(broadcast,17,stdin); if(strcmp(broadcast,"\n") == 0) return 0; set_broadcast(interface_name,broadcast); return 0;}//ifconfig up接口：SIOCSIFFLAGSint interface_up(char * interface_name){ int s; if((s = socket(PF_INET,SOCK_STREAM,0)) < 0) { perror("Socket"); return -1; } struct ifreq ifr; strcpy(ifr.ifr_name,interface_name); short flag; flag = IFF_UP; if(ioctl(s,SIOCGIFFLAGS,&ifr) < 0) { perror("ioctl"); return -1; } ifr.ifr_ifru.ifru_flags |= flag; if(ioctl(s,SIOCSIFFLAGS,&ifr) < 0) { perror("ioctl"); return -1; } return 0;}//关闭接口int interface_down(char * interface_name){ if(strcmp(interface_name,"lo") == 0) { printf("You can't pull down interface lo\n"); return 0; } int s; if((s = socket(PF_INET,SOCK_STREAM,0)) < 0) { perror("Socket"); return -1; } struct ifreq ifr; strcpy(ifr.ifr_name,interface_name); short flag; flag = ~IFF_UP; if(ioctl(s,SIOCGIFFLAGS,&ifr) < 0) { perror("ioctl"); return -1; } ifr.ifr_ifru.ifru_flags &= flag; if(ioctl(s,SIOCSIFFLAGS,&ifr) < 0) { perror("ioctl"); return -1; } return 0;}//设置IPint set_ipaddr(char * interface_name,char * ip){ int s; if((s = socket(PF_INET,SOCK_STREAM,0)) < 0) { perror("Socket"); return -1; } struct ifreq ifr; strcpy(ifr.ifr_name,interface_name); struct sockaddr_in addr; bzero(&addr,sizeof(struct sockaddr_in)); addr.sin_family = PF_INET; inet_aton(ip,&addr.sin_addr); memcpy(&ifr.ifr_ifru.ifru_addr,&addr,sizeof(struct sockaddr_in)); if(ioctl(s,SIOCSIFADDR,&ifr) < 0) { perror("ioctl"); return -1; } return 0;}//设置MACint set_mac(char * interface_name,char * mac_addr){ int s; if((s = socket(PF_INET,SOCK_STREAM,0)) < 0) { perror("Socket"); return -1; } struct ifreq ifr; strcpy(ifr.ifr_name,interface_name); if(ioctl(s,SIOCGIFHWADDR,&ifr) < 0) { perror("ioctl"); return -1; } sa_family_t get_family; get_family = ifr.ifr_ifru.ifru_hwaddr.sa_family; interface_down(interface_name); bzero(&ifr,sizeof(struct ifreq)); strcpy(ifr.ifr_name,interface_name); ifr.ifr_ifru.ifru_hwaddr.sa_family = get_family; short tmp; int i,j; j = 0; for(i = 0;i < 17; i += 3) { if(mac_addr[i] < 58 && mac_addr[i] > 47) tmp = mac_addr[i]-48; if(mac_addr[i] < 71 && mac_addr[i] > 64) tmp = mac_addr[i]-55; if(mac_addr[i] < 103 && mac_addr[i] > 96) tmp = mac_addr[i]-87; tmp = tmp << 4; if(mac_addr[i+1] < 58 && mac_addr[i+1] > 47) tmp |= (mac_addr[i+1]-48); if(mac_addr[i+1] < 71 && mac_addr[i+1] > 64) tmp |= (mac_addr[i+1]-55); if(mac_addr[i+1] < 103 && mac_addr[i+1] > 96) tmp |= (mac_addr[i+1]-87); memcpy(&ifr.ifr_ifru.ifru_hwaddr.sa_data[j++],&tmp,1); } if(ioctl(s,SIOCSIFHWADDR,&ifr) < 0) { perror("ioctl"); return -1; } interface_up(interface_name); return 0;}//设置掩码int set_netmask(char * interface_name,char * netmask){ int s; if((s = socket(PF_INET,SOCK_STREAM,0)) < 0) { perror("Socket"); return -1; } struct ifreq ifr; strcpy(ifr.ifr_name,interface_name); struct sockaddr_in netmask_addr; bzero(&netmask_addr,sizeof(struct sockaddr_in)); netmask_addr.sin_family = PF_INET; inet_aton(netmask,&netmask_addr.sin_addr); memcpy(&ifr.ifr_ifru.ifru_netmask,&netmask_addr,sizeof(struct sockaddr_in)); if(ioctl(s,SIOCSIFNETMASK,&ifr) < 0) { perror("ioctl"); return -1; } return 0;}//设置广播地址int set_broadcast(char * interface_name,char * broadcast){ int s; if((s = socket(PF_INET,SOCK_STREAM,0)) < 0) { perror("Socket"); return -1; } struct ifreq ifr; strcpy(ifr.ifr_name,interface_name); struct sockaddr_in broadcast_addr; bzero(&broadcast_addr,sizeof(struct sockaddr_in)); broadcast_addr.sin_family = PF_INET; inet_aton(broadcast,&broadcast_addr.sin_addr); memcpy(&ifr.ifr_ifru.ifru_broadaddr,&broadcast_addr,sizeof(struct sockaddr_in)); if(ioctl(s,SIOCSIFBRDADDR,&ifr) < 0) { perror("ioctl"); return -1; } return 0;}int usage(void){ printf("Usage: myifconfig [all]|[interface [set|up|down]]\n"); return 0;}
