linux下獲取設定ip位址等函式

//獲取本機ip位址函式

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qstring getlocalip()  

memset(&ifr_ip, 0, sizeof

(ifr_ip));     

strncpy(ifr_ip.ifr_name, "eth0"

, sizeof

(ifr_ip.ifr_name) - 1);     

if( ioctl( sock_get_ip, siocgifaddr, &ifr_ip) < 0 )     

sin = (struct

sockaddr_in *)&ifr_ip.ifr_addr;     

strcpy(ipaddr,inet_ntoa(sin->sin_addr));         

printf("local ip:%s /n"

,ipaddr);      

close( sock_get_ip );  

return

qstring( ipaddr );  

}  

//修改本機ip位址的函式

intsetlocalip( 

const

char

*ipaddr )  

memset( &sin_set_ip, 0, sizeof

(sin_set_ip));  

strncpy(ifr_set_ip.ifr_name, "eth0"

, 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));  

if( ioctl( sock_set_ip, siocsifaddr, &ifr_set_ip) < 0 )  

//設定啟用標誌

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 )  

close( sock_set_ip );  

return

0;  

}  

獲取本機mac位址函式

qstring getlocalmac()  

memset(&ifr_mac,0,sizeof

(ifr_mac));     

strncpy(ifr_mac.ifr_name, "eth0"

, sizeof

(ifr_mac.ifr_name)-1);     

if( (ioctl( sock_mac, siocgifhwaddr, &ifr_mac)) < 0)  

sprintf(mac_addr,"%02x%02x%02x%02x%02x%02x"

,  (unsigned char

)ifr_mac.ifr_hwaddr.sa_data[0],  

(unsigned char

)ifr_mac.ifr_hwaddr.sa_data[1],  

(unsigned char

)ifr_mac.ifr_hwaddr.sa_data[2],  

(unsigned char

)ifr_mac.ifr_hwaddr.sa_data[3],  

(unsigned char

)ifr_mac.ifr_hwaddr.sa_data[4],  

(unsigned char

)ifr_mac.ifr_hwaddr.sa_data[5]);  

printf("local mac:%s /n"

,mac_addr);      

close( sock_mac );  

return

qstring( mac_addr );  

}  

//獲取子網掩碼的函式

qstring getlocalnetmask()  

memset(&ifr_mask, 0, sizeof

(ifr_mask));     

strncpy(ifr_mask.ifr_name, ifname, sizeof

(ifr_mask.ifr_name )-1);     

if( (ioctl( sock_netmask, siocgifnetmask, &ifr_mask ) ) < 0 )   

net_mask = ( struct

sockaddr_in * )&( ifr_mask.ifr_netmask );  

strcpy( netmask_addr, inet_ntoa( net_mask -> sin_addr ) );  

printf("local netmask:%s/n"

,netmask_addr);      

close( sock_netmask );  

return

qstring( netmask_addr );  

}  

//修改子netmask的函式

qstring setlocalnetmask(

const

char

*sznetmask)  

memset(&ifr_mask, 0, sizeof

(ifr_mask));     

strncpy(ifr_mask.ifr_name, "eth0"

, sizeof

(ifr_mask.ifr_name )-1);     

sin_net_mask = (struct

sockaddr_in *)&ifr_mask.ifr_addr;  

sin_net_mask -> sin_family = af_inet;  

inet_pton(af_inet, sznetmask, &sin_net_mask ->sin_addr);  

if(ioctl(sock_netmask, siocsifnetmask, &ifr_mask ) < 0)   

}  

//獲去gateway

qstring getgateway()  

while

(fgets(buf, 

sizeof

(buf), fp) != null)  

sscanf(buf, "%*s%*s%s"

, gateway);         

printf("default gateway:%s/n"

, gateway);  

pclose(fp);  

return

qstring(gateway);  

}  

//設定閘道器

intsetgateway(

const

char

*szgateway)  

strcpy(cmd, "route add default gw "

);  

strcat(cmd, szgateway);  

ret = system(cmd);  

if(ret < 0)  

return

ret;  

}  

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