MasterDragon

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**顯示本機所有網卡的IP address, netmask, broadcast**
<code c>
#include <stdio.h>      
#include <sys/types.h>
#include <ifaddrs.h>
#include <netinet/in.h> 
#include <string.h> 
#include <arpa/inet.h>

int main (int argc, const char * argv[]) {
	struct ifaddrs * ifAddrStruct=NULL;
	void * tmpAddrPtr=NULL;

	getifaddrs(&ifAddrStruct);

	while (ifAddrStruct!=NULL) {
		if (ifAddrStruct->ifa_addr->sa_family==AF_INET) { // check it is IP4

			// is a valid IP4 Address
			tmpAddrPtr=&((struct sockaddr_in *)ifAddrStruct->ifa_addr)->sin_addr;
			char addressBuffer[INET_ADDRSTRLEN];
			inet_ntop(AF_INET, tmpAddrPtr, addressBuffer, INET_ADDRSTRLEN);

			// Netmask
			tmpAddrPtr=&((struct sockaddr_in *)ifAddrStruct->ifa_netmask)->sin_addr;
			char netmaskBuffer[INET_ADDRSTRLEN];
			inet_ntop(AF_INET, tmpAddrPtr, netmaskBuffer, INET_ADDRSTRLEN);

			// Broadcast
			tmpAddrPtr=&((struct sockaddr_in *)ifAddrStruct->ifa_broadaddr)->sin_addr;
			char broadaddrBuffer[INET_ADDRSTRLEN];
			inet_ntop(AF_INET, tmpAddrPtr, broadaddrBuffer, INET_ADDRSTRLEN);

			printf("%s IP Address %s Netmask %s Broadcast %s\n", ifAddrStruct->ifa_name, addressBuffer, netmaskBuffer, broadaddrBuffer); 

		} else if (ifAddrStruct->ifa_addr->sa_family==AF_INET6) { // check it is IP6
			
			// is a valid IP6 Address
			tmpAddrPtr=&((struct sockaddr_in *)ifAddrStruct->ifa_addr)->sin_addr;
			char addressBuffer[INET6_ADDRSTRLEN];
			inet_ntop(AF_INET6, tmpAddrPtr, addressBuffer, INET6_ADDRSTRLEN);
			printf("%s IP Address %s\n", ifAddrStruct->ifa_name, addressBuffer); 
			
		} 
		
		ifAddrStruct=ifAddrStruct->ifa_next;
	}
	return 0;
}

</code>