C 语言执行 whois 查询

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 ( [e-mail] )

 * */

 

#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;

}

评论

1 楼 cloudmail 2014-03-20  

1，telnet whois.iana.org 43
2，发送待查询的域名，比如163.com
3，逐行解析返回的结果，提取 refer: 字段获得一个地址，如whois.verisign-grs.com
4，telnet whois.verisign-grs.com 43
5，发送待查询的域名，如163.com
6，这时就拿到域名的注册信息了