Re: ftp(1) breakage w/ passive mode?

[Cy Schubert - ITSD Open Systems Group]

This might even solve my Kerberos V problem when IPv6 is enabled in the 
kernel.


Regards,                       Phone:  (250)387-8437
Cy Schubert                      Fax:  (250)387-5766
Team Leader, Sun/DEC Team   Internet:  [EMAIL PROTECTED]
Open Systems Group, ITSD, ISTA
Province of BC

In message <[EMAIL PROTECTED]>, Hajimu UMEMOTO 
writes:
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> 
> >>>>> On Sun, 28 May 2000 21:04:23 -0400
> >>>>> Will Andrews <[EMAIL PROTECTED]> said:
> 
> > What would make ftp(1) think it has an IPv6 connection?
> 
> andrews> I have no idea..
> 
> It seems ftp(1) think using IPv6.
> 
> There is a bug in existing getaddrinfo().  getaddrinfo() returns IPv4
> address as IPv4 mapped IPv6 address in some case.  It occures when:
> 
>       - INET6 is enabled in kernel
>       - host has A RR and AAAA RR
> 
> IPv4 connection via mapped address is still IPv6 connection.  In this
> case, if ftp(1) doesn't have awareness of using mapped address, your
> problem will occur.  And, ftp(1) seems not aware about it.
> 
> But, it seems ftp.FreeBSD.org does't have AAAA RR.  So, I believe it
> is not applicable to your case.  And, actually I dont' see this
> problem here.  However, I have no idea without this case.  So, I
> attach the patch to solve getaddrinfo() problem.  Please try it and I
> would like to hear the result.
> 
> 
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> Content-Description: getaddrinfo-mapped-workaround.diff
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>  filename="getaddrinfo-mapped-workaround.diff"
> 
> Index: lib/libc/net/getaddrinfo.c
> diff -u lib/libc/net/getaddrinfo.c.orig lib/libc/net/getaddrinfo.c
> --- lib/libc/net/getaddrinfo.c.orig   Thu Apr 20 12:31:40 2000
> +++ lib/libc/net/getaddrinfo.c        Mon Apr 24 21:41:24 2000
> @@ -148,6 +148,7 @@
>  static int get_portmatch __P((const struct addrinfo *, const char *));
>  static int get_port __P((struct addrinfo *, const char *, int));
>  static const struct afd *find_afd __P((int));
> +static void unmappedaddr __P((struct addrinfo *));
>  
>  static char *ai_errlist[] = {
>       "Success",
> @@ -512,6 +513,7 @@
>                        */
>                       GET_CANONNAME(cur->ai_next, hp->h_name);
>               }
> +             unmappedaddr(cur->ai_next);
>  
>               while (cur && cur->ai_next)
>                       cur = cur->ai_next;
> @@ -903,4 +905,25 @@
>                       return afd;
>       }
>       return NULL;
> +}
> +
> +static void
> +unmappedaddr(struct addrinfo *res)
> +{
> +     struct sockaddr_in6 *sin6;
> +     struct sockaddr_in *sin;
> +     u_int32_t addr;
> +     int port;
> +
> +     sin6 = (struct sockaddr_in6 *)res->ai_addr;
> +     if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
> +             sin = (struct sockaddr_in *)res->ai_addr;
> +             addr = *(u_int32_t *)&sin6->sin6_addr.s6_addr[12];
> +             port = sin6->sin6_port;
> +             memset(res->ai_addr, 0, res->ai_addrlen);
> +             sin->sin_addr.s_addr = addr;
> +             sin->sin_port = port;
> +             sin->sin_family = res->ai_family = AF_INET;
> +             sin->sin_len = res->ai_addrlen = sizeof(struct sockaddr_in);
> +     }
>  }
> 
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> 
> Hajimu UMEMOTO @ Internet Mutual Aid Society Yokohama, Japan
> [EMAIL PROTECTED]  [EMAIL PROTECTED]  [EMAIL PROTECTED]
> http://www.imasy.org/~ume/
> 
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