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			域名，ip相互轉換（Linux，getaddrinfo, getnameinfo）--- 轉
		
            
		
            參考鏈接：
              
            http://en.wikipedia.org/wiki/Getaddrinfo
              
            代碼：
              
             
              
            01/* ip_to_hostname ip */
            02#include <sys/types.h>
            03#include <sys/socket.h>
            04#include <netdb.h>
            05#include <unistd.h>
            06#include <stdio.h>
            07#include <stdlib.h>
            08#include <string.h>
            09 
            10int main(int argc, char *argv[])
            11{
            12        if (argc != 2)
            13        {
            14                fprintf(stderr, "Usage: %s hostname\n", argv[0]);
            15                exit(EXIT_FAILURE);
            16        }
            17        struct addrinfo hints;
            18        struct addrinfo *result, *result_pointer;
            19        int ret;
            20        /* obtaining address matching host */
            21        memset(&hints, 0, sizeof(struct addrinfo));
            22        hints.ai_family = AF_UNSPEC;
            23        hints.ai_socktype = SOCK_STREAM;
            24        hints.ai_flags = AI_CANONNAME | AI_NUMERICHOST;
            25        hints.ai_protocol = 0;  /* any protocol */
            26 
            27//       ret = getaddrinfo(argv[1], NULL, &hints,  &result);                                                                                                              
            28        ret = getaddrinfo(argv[1], NULL, &hints, &result);
            29        if (ret != 0)
            30        {
            31                fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(ret));
            32                exit(EXIT_FAILURE);
            33        }
            34        /* traverse the returned list and output the ip addresses */
            35        for (result_pointer = result; result_pointer != NULL; result_pointer = result_pointer->ai_next)
            36        {
            37                char hostname[1025] = "";
            38                ret = getnameinfo(result_pointer->ai_addr, result_pointer->ai_addrlen, hostname, sizeof(hostname), NULL, 0, NI_NAMEREQD);
            39                if (ret != 0)
            40                {
            41                        fprintf(stderr, "error in getnameinfo: %s \n", gai_strerror(ret));
            42                }
            43                else
            44                {
            45                        printf("hostname: %s \n", hostname);
            46                }
            47//               printf("hostname: %s \n",  result_pointer->ai_canonname);                                                                                                
            48        }
            49        freeaddrinfo(result);
            50        exit(EXIT_SUCCESS);
            51}
                
             
              
             
              
            01/* hostname_to_ip hostname */
            02#include <sys/types.h>
            03#include <sys/socket.h>
            04#include <netdb.h>
            05#include <unistd.h>
            06#include <stdio.h>
            07#include <stdlib.h>
            08#include <string.h>
            09 
            10int main(int argc, char *argv[])
            11{
            12        if (argc != 2)
            13        {
            14                fprintf(stderr, "Usage: %s hostname\n", argv[0]);
            15                exit(EXIT_FAILURE);
            16        }
            17        struct addrinfo hints;
            18        struct addrinfo *result, *result_pointer;
            19        int ret;
            20        /* obtaining address matching host */
            21        memset(&hints, 0, sizeof(struct addrinfo));
            22        hints.ai_family = AF_UNSPEC;
            23        hints.ai_socktype = SOCK_STREAM;
            24        hints.ai_flags = AI_CANONNAME;
            25        hints.ai_protocol = 0;  /* any protocol */
            26 
            27//       ret = getaddrinfo(argv[1], NULL, &hints,  &result);                                                                                                              
            28        ret = getaddrinfo(argv[1], NULL, &hints, &result);
            29        if (ret != 0)
            30        {
            31                fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(ret));
            32                exit(EXIT_FAILURE);
            33        }
            34        /* traverse the returned list and output the ip addresses */
            35        for (result_pointer = result; result_pointer != NULL; result_pointer = result_pointer->ai_next)
            36        {
            37                char hostname[1025] = "";
            38                ret = getnameinfo(result_pointer->ai_addr, result_pointer->ai_addrlen, hostname, sizeof(hostname), NULL, 0, NI_NUMERICHOST);
            39                if (ret != 0)
            40                {
            41                        fprintf(stderr, "error in getnameinfo: %s \n", gai_strerror(ret));
            42                        continue;
            43                }
            44                else
            45                {
            46                        printf("IP: %s \n", hostname);
            47                }
            48        }
            49        freeaddrinfo(result);
            50        exit(EXIT_SUCCESS);
            51}
                
             
              
            結果：
              
            root@localhost :/home/James/mypro/Linux-Pro/Network# ./hostname_to_ip baidu.com
             IP: 123.125.114.144 
             IP: 220.181.111.85 
             IP: 220.181.111.86 
             root@localhost :/home/James/mypro/Linux-Pro/Network# ./ip_to_hostname 220.181.111.86
             error in getnameinfo: Name or service not known 
             root@localhost :/home/James/mypro/Linux-Pro/Network# ./ip_to_hostname 10.0.0.78
             hostname: localhost 
              
            root@localhost:/home/James/mypro/Linux-Pro/Network# ./ip_to_hostname 59.66.137.62
             hostname: th137062.ip.tsinghua.edu.cn 
             root@localhost:/home/James/mypro/Linux-Pro/Network# ./ip_to_hostname 202.106.182.229
             hostname: mail182-229.sinamail.sina.com.cn 
             root@localhost:/home/James/mypro/Linux-Pro/Network# ./ip_to_hostname 211.147.4.7
             hostname: mail3.douban.com
            
		
            
			posted on 2012-11-12 14:44 大龍 閱讀(4175) 評論(0)  編輯 收藏 引用  
		
            
	
            
	
	


	


            
	    
    




            






            

				

            



    
    







            
	   
	



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