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【C】获取本机IP地址列表

作者:步山 / 发布于2014/11/10/ 520


	/*
	* main.c
	* ----------------------------------------------
	* 2013-01-09 chrisniu1984@gmail.com
	*
	* [BUILD]
	* gcc -o main main.c -Wall
	*
	*/

	#include <stdio.h>

	#include <netdb.h>
	#include <ifaddrs.h>

	// 系统定义的结构，贴在这里方便大家查阅，也可man getifaddrs查看。
	// struct ifaddrs {
	// struct ifaddrs *ifa_next; /* Next item in list */
	// char *ifa_name; /* Name of interface */
	// unsigned int ifa_flags; /* Flags from SIOCGIFFLAGS */
	// struct sockaddr *ifa_addr; /* Address of interface */
	// struct sockaddr *ifa_netmask; /* Netmask of interface */
	// union {
	// struct sockaddr *ifu_broadaddr;
	// /* Broadcast address of interface */
	// struct sockaddr *ifu_dstaddr;
	// /* Point-to-point destination address */
	// } ifa_ifu;
	// #define ifa_broadaddr ifa_ifu.ifu_broadaddr
	// #define ifa_dstaddr ifa_ifu.ifu_dstaddr
	// void *ifa_data; /* Address-specific data */
	// };

	int main(int argc, char **argv)
	{
	 struct ifaddrs *ifa;
	 if (getifaddrs(&ifa) != 0) {
	 return -1;
	 }

	 for (; ifa!=NULL; ifa=ifa->ifa_next) {
	 struct sockaddr_in *sin = (struct sockaddr_in*)ifa->ifa_addr;
	 if (sin->sin_family != AF_INET) {
	 continue;
	 }

	 unsigned char *b = (unsigned char *)(&sin->sin_addr.s_addr);
	 printf("%s\t%u.%u.%u.%u\n", ifa->ifa_name, b[0], b[1], b[2], b[3]);
	 }

	 return 0;
	}

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