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百度質(zhì)量部面試筆試體驗之—三面
1.有過什么實習(xí)經(jīng)歷啊?
1.1安天實驗室
在哈爾濱安天實驗室，我在CERT組實習(xí)，跟過兩個大神，一個是胡哥，部門技術(shù)經(jīng)理，在異常分析方面很犀利，
百度質(zhì)量部面試筆試體驗之—三面
。一個是swordlea，對李哥的印象就是C++大神，同時他也是CERT老大。當(dāng)時的項目是做一個whois的查詢插件，VC++編寫。當(dāng)然的組件功能是輸入一個IP地址，能夠查詢出它的whois信息，因為有點久了，當(dāng)時也是借鑒網(wǎng)上代碼寫出來的，自己的代碼找不到了(當(dāng)然怎么就沒備份呢)，就拿網(wǎng)上的代碼湊合一下：/*
* @brief
* Whois client program
*
* @details
* This program shall fetch whois data for a IPv4 address.
*
* @author Silver Moon ( m00n.silv3r@gmail.com )
* */
#include //scanf , printf
#include //strtok
#include //realloc
#include //socket
#include //sockaddr_in
#include //getsockname
#include //hostent
#include //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 an d 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) = ”\”;
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;
}
1.2 大連東軟
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