R: Re: [ds6-devel] gethostbyaddr() problem

[simone at deepspace6.net]

IIRC the last parameter should be sizeof(buf) instead of 16 and buf should be large enough to hold the representation, e.g. at least 38 bytes... Check the return value to see if conversion succeded.

Bye

-- 
Sent from my wireless blackberry handheld.

-----Original Message-----
From: Kirk Bollinger <kirk at 128bits.org>
To: ds6-devel at deepspace6.net <ds6-devel at deepspace6.net>
Sent: Wed May 28 21:30:44 2003
Subject: Re: [ds6-devel] gethostbyaddr() problem

On Thu, 15 May 2003, Mauro Tortonesi wrote:
> inet_ntop(AF_INET6, &sin6, buf, sizeof(buf) - 1);
> buf[sizeof(buf) - 1] = '\0';
> 
> becomes:
> 
> getnameinfo(&sin6, sizeof(sin6), buf, sizeof(buf) - 1,
>             NULL, 0, NI_NUMERICHOST);
> buf[sizeof(buf) - 1] = '\0';
> 
> 
> and:
> 
> 
> inet_pton(AF_INET6, buf, &sin6);
> 
> becomes:
> 
> getaddrinfo(buf, "ftp", &hints, &res);
> 
> the address you were looking for is in:
> 
> ((struct sockaddr_in6 *)res->ai_addr)->sin6_addr;


thanks for the help!

now, I have one more thing I can't get to work. I want to print out the 
addresses in ascii. I know that inet_ntop() is discouraged but it should 
work. 

here's my code:
if (res->ai_family == AF_INET6)
      {
        printf("\nAddress family: AF_INET6");
        //printf("\nThe address is: %s", ((struct sockaddr_in6 
*)res->ai_addr)->sin6_addr);
        
        printf("\nnet_byte_order in hex is: %x", ((struct sockaddr_in6 
*)res->ai_addr)->sin6_addr);
        memset(&sin6, 0, sizeof(struct sockaddr_in6));  
        memcpy(&sin6, (struct sockaddr_in6 *)res->ai_addr, sizeof(struct 
sockaddr_in6));        
        inet_ntop(AF_INET6, &sin6.sin6_addr, buf, 16);
        
        printf("\nAddress is: %s", buf);

here's the output I'm getting:
Address family: AF_INET6
net_byte_order in hex is: 105fe3f
Address is: 

I'm having fun playing and learning. 

-kirk

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