#include <sys/socket.h>
#include <netdb.h>
#include <arpa/inet.h>
#include <err.h>
#define OUTSTR_SIZE 4096

extern "C"
{  
  const char* copyStr( const char* str )
  {
	  char* s = (char*)malloc(strlen(str) + 1);
	  strcpy(s, str);
	  return s;
  }
  
  const char* IOSGetAddressInfo(const char *host )
  {
	  if( NULL == host )
		  return copyStr("ERROR_HOSTNULL");
	  char outstr[OUTSTR_SIZE];
	  struct addrinfo hints, *res, *res0;
	  memset(&hints, 0, sizeof(hints));
	  //AF_INET(只返回ipv4)，AF_INET6(只返回ipv6)和AF_UNSPEC(函数返回的是适用于指定主机名和服务名且适合任何协议族的地址)
	  //如果某个主机既有AAAA记录(IPV6)地址，同时又有A记录(IPV4)地址，那么AAAA记录将作为sockaddr_in6结构返回，而A记录则作为sockaddr_in结构返回
	  hints.ai_family = PF_UNSPEC;
	  hints.ai_socktype = SOCK_STREAM;
	  hints.ai_flags = AI_DEFAULT;
	  
	  printf("getaddrinfo: %s\n", host);
	  //获取地址信息,这个函数支持ipv4和ipv6
	  int error = getaddrinfo(host, "http", &hints, &res0);
	  if (error != 0 )
	  {
		  printf("getaddrinfo: %s\n", gai_strerror(error));
		  return copyStr("ERROR_GETADDR");
	  }
	  memset( outstr, 0, sizeof(char)*OUTSTR_SIZE );
	  struct sockaddr_in6* addr6;
	  struct sockaddr_in* addr;
	  const char* solvedaddr;
	  char ipbuf[32];
	  for (res = res0; res; res = res->ai_next)
	  {
		  if (res->ai_family == AF_INET6)
		  {
			  addr6 =( struct sockaddr_in6*)res->ai_addr;
			  //把二进制的ip转换为点数格式的ip地址  ipv6格式
			  solvedaddr = inet_ntop(AF_INET6, &addr6->sin6_addr, ipbuf, sizeof(ipbuf));
			  strcat ( outstr, "ipv6|");
			  strcat ( outstr, solvedaddr);
		  }
		  else
		  {
			  addr =( struct sockaddr_in*)res->ai_addr;
			  //把二进制的ip转换为点数格式的ip地址  ipv4格式
			  solvedaddr = inet_ntop(AF_INET, &addr->sin_addr, ipbuf, sizeof(ipbuf));
			  strcat ( outstr, "ipv4|");
			  strcat ( outstr, solvedaddr);
		  }
		  strcat ( outstr, "|");
	  }
	  return copyStr(outstr);
  }
}