Date: Mon, 29 May 2000 08:01:35 -0700 From: Cy Schubert - ITSD Open Systems Group <Cy.Schubert@uumail.gov.bc.ca> To: Hajimu UMEMOTO (=?ISO-2022-JP?B?GyRCR19LXBsoQiA=?= =?ISO-2022-JP?B?GyRCSCUbKEI=?=) <ume@bisd.hitachi.co.jp> Cc: andrews@technologist.com, Cy.Schubert@uumail.gov.bc.ca, stable@FreeBSD.ORG, current@FreeBSD.ORG Subject: Re: ftp(1) breakage w/ passive mode? Message-ID: <200005291501.e4TF1nr01222@cwsys.cwsent.com> In-Reply-To: Your message of "Mon, 29 May 2000 19:35:26 %2B0900." <20000529193526V.ume@bisd.hitachi.co.jp>
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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: Cy.Schubert@osg.gov.bc.ca
Open Systems Group, ITSD, ISTA
Province of BC
In message <20000529193526V.ume@bisd.hitachi.co.jp>, Hajimu UMEMOTO
writes:
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>
> >>>>> On Sun, 28 May 2000 21:04:23 -0400
> >>>>> Will Andrews <andrews@technologist.com> 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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> Content-Description: My Signature
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>
> Hajimu UMEMOTO @ Internet Mutual Aid Society Yokohama, Japan
> ume@mahoroba.org ume@bisd.hitachi.co.jp ume@FreeBSD.org
> http://www.imasy.org/~ume/
>
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>
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