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C 语言执行 whois 查询

发表于: 2013-06-28   作者:cloudmail   来源:转载   浏览:
摘要: http://www.binarytides.com/c-code-to-perform-ip-whois/ http://www.oschina.net/code/snippet_12_9390       /*   * @brief   * Whois client program   *
http://www.binarytides.com/c-code-to-perform-ip-whois/
http://www.oschina.net/code/snippet_12_9390
 
 
 
/*
  * @brief
  * Whois client program
  *
  * @details
  * This program shall fetch whois data for a IPv4 address.
  *
  * @author Silver Moon ( m00n.silv3r@gmail.com )
  * */
 
#include<stdio.h> //scanf , printf
#include<string.h>    //strtok
#include<stdlib.h>    //realloc
#include<sys/socket.h>    //socket
#include<netinet/in.h> //sockaddr_in
#include<arpa/inet.h> //getsockname
#include<netdb.h> //hostent
#include<unistd.h>    //close
 
int main( int argc , char *argv[])
{
     char ip[100] , *data = NULL;
     
     printf ( "Enter ip address to whois : " );
     scanf ( "%s" , ip);
     
     get_whois(ip , &data);
     printf ( "\n\n" );
     puts (data);
     
     free (data);
     return 0;
}
 
/**
     Get the whois content of an ip
     by selecting the correct server
*/
void get_whois( char *ip , char **data)
{
     char *wch = NULL, *pch , *response = NULL;
     
     if (whois_query( "whois.iana.org" , ip , &response))
     {
         printf ( "Whois query failed" );
     }
     
     pch = strtok (response , "\n" );
     
     while (pch != NULL)
     {
         //Check if whois line
         wch = strstr (pch , "whois." );
         if (wch != NULL)
         {
             break ;
         }
 
         //Next line please
         pch = strtok (NULL , "\n" );
     }
     
     if (wch != NULL)
     {
         printf ( "\nWhois server is : %s" , wch);
         whois_query(wch , ip , data);
     }
     else
     {
         *data = malloc (100);
         strcpy (*data , "No whois data" );
     }
     
     return ;
}
 
/*
  * Perform a whois query to a server and record the response
  * */
int whois_query( char *server , char *query , char **response)
{
     char ip[32] , message[100] , buffer[1500];
     int sock , read_size , total_size = 0;
     struct sockaddr_in dest;
      
     sock = socket(AF_INET , SOCK_STREAM , IPPROTO_TCP);
      
     //Prepare connection structures :)
     memset ( &dest , 0 , sizeof (dest) );
     dest.sin_family = AF_INET;
      
     printf ( "\nResolving %s..." , server);
     if (hostname_to_ip(server , ip))
     {
         printf ( "Failed" );
         return 1;
     }
     printf ( "%s" , ip);   
     dest.sin_addr.s_addr = inet_addr( ip );
     dest.sin_port = htons( 43 );
 
     //Now connect to remote server
     if (connect( sock , ( const struct sockaddr*) &dest , sizeof (dest) ) < 0)
     {
         perror ( "connect failed" );
     }
     
     //Now send some data or message
     printf ( "\nQuerying for ... %s ..." , query);
     sprintf (message , "%s\r\n" , query);
     if ( send(sock , message , strlen (message) , 0) < 0)
     {
         perror ( "send failed" );
     }
     
     //Now receive the response
     while ( (read_size = recv(sock , buffer , sizeof (buffer) , 0) ) )
     {
         *response = realloc (*response , read_size + total_size);
         if (*response == NULL)
         {
             printf ( "realloc failed" );
         }
         memcpy (*response + total_size , buffer , read_size);
         total_size += read_size;
     }
     printf ( "Done" );
     fflush (stdout);
     
     *response = realloc (*response , total_size + 1);
     *(*response + total_size) = '\0' ;
     
     close(sock);
     return 0;
}
 
/*
  * @brief
  * Get the ip address of a given hostname
  *
  * */
int hostname_to_ip( char * hostname , char * ip)
{
     struct hostent *he;
     struct in_addr **addr_list;
     int i;
         
     if ( (he = gethostbyname( hostname ) ) == NULL)
     {
         // get the host info
         herror( "gethostbyname" );
         return 1;
     }
 
     addr_list = ( struct in_addr **) he->h_addr_list;
     
     for (i = 0; addr_list[i] != NULL; i++)
     {
         //Return the first one;
         strcpy (ip , inet_ntoa(*addr_list[i]) );
         return 0;
     }
     
     return 0;
}

C 语言执行 whois 查询

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