[PATCH] Adds patch for odhcp to not announce itself as DNS-server

[mayosemmel]

Hallo Tobias,

ich hab das einmal durchgebaut und getestet.
Funktioniert leider nicht. Ich hab auch mal die Pakete mitgeschnitten,
es ist immernoch die icmpv6 Option und dhcpv6 Option aktiv.

Ich wäre aber trotzdem dafür das in den Master zu tun, dann können wir
gemeinsam auf einer ordentlichen Grundlage einen Patch bauen.

Ich stelle mir aber die gleiche Frage wie Patrick, ob wir wirklich
dhcpv6 und RA brauchen.
Eventuell kann Tim uns verraten, weshalb er beides angemacht hat.

Grüße Jan

Am Dienstag, den 19.01.2016, 12:42 +0100 schrieb Tobias Klaus:
> Signed-off-by: Tobias Klaus <tk+ff at meskal.net>
> ---
>  ...ting-dns-via-dhcp-if-no-servers-are-given.patch | 52 ++++++++++++++++++++++
>  buildscript                                        |  3 ++
>  2 files changed, 55 insertions(+)
>  create mode 100644 build_patches/0001-disable-setting-dns-via-dhcp-if-no-servers-are-given.patch
> 
> diff --git a/build_patches/0001-disable-setting-dns-via-dhcp-if-no-servers-are-given.patch b/build_patches/0001-disable-setting-dns-via-dhcp-if-no-servers-are-given.patch
> new file mode 100644
> index 0000000..ae6c2a1
> --- /dev/null
> +++ b/build_patches/0001-disable-setting-dns-via-dhcp-if-no-servers-are-given.patch
> @@ -0,0 +1,52 @@
> +From 64b65498b04f14dd005c134ae67fd69f60baef82 Mon Sep 17 00:00:00 2001
> +From: Tobias Klaus <klaus at cs.fau.de>
> +Date: Tue, 19 Jan 2016 12:13:37 +0100
> +Subject: [PATCH] disable setting dns via dhcp if no servers are given
> +
> +---
> + ...ot-send-DNS-Servers-if-none-is-configured.patch | 33 ++++++++++++++++++++++
> + 1 file changed, 33 insertions(+)
> + create mode 100644 package/network/services/odhcpd/patches/0001-Do-not-send-DNS-Servers-if-none-is-configured.patch
> +
> +diff --git a/package/network/services/odhcpd/patches/0001-Do-not-send-DNS-Servers-if-none-is-configured.patch b/package/network/services/odhcpd/patches/0001-Do-not-send-DNS-Servers-if-none-is-configured.patch
> +new file mode 100644
> +index 0000000..d458569
> +--- /dev/null
> ++++ b/package/network/services/odhcpd/patches/0001-Do-not-send-DNS-Servers-if-none-is-configured.patch
> +@@ -0,0 +1,33 @@
> ++From 59df02650ccbeb72712cb6ffb9487ca16ad5bcc7 Mon Sep 17 00:00:00 2001
> ++From: Tobias Klaus <klaus at cs.fau.de>
> ++Date: Tue, 19 Jan 2016 12:05:02 +0100
> ++Subject: [PATCH] Do not send DNS-Servers if none is configured
> ++
> ++---
> ++ src/dhcpv6.c | 8 +-------
> ++ 1 file changed, 1 insertion(+), 7 deletions(-)
> ++
> ++diff --git a/src/dhcpv6.c b/src/dhcpv6.c
> ++index 9f91162..41491d5 100644
> ++--- a/src/dhcpv6.c
> +++++ b/src/dhcpv6.c
> ++@@ -224,15 +224,9 @@ static void handle_client_request(void *addr, void *data, size_t len,
> ++ 	} refresh = {htons(DHCPV6_OPT_INFO_REFRESH), htons(sizeof(uint32_t)),
> ++ 			htonl(600)};
> ++ 
> ++-	struct in6_addr dns_addr, *dns_addr_ptr = iface->dns;
> +++	struct in6_addr *dns_addr_ptr = iface->dns;
> ++ 	size_t dns_cnt = iface->dns_cnt;
> ++ 
> ++-	if ((dns_cnt == 0) &&
> ++-		!odhcpd_get_linklocal_interface_address(iface->ifindex, &dns_addr)) {
> ++-		dns_addr_ptr = &dns_addr;
> ++-		dns_cnt = 1;
> ++-	}
> ++-
> ++ 	struct {
> ++ 		uint16_t type;
> ++ 		uint16_t len;
> ++-- 
> ++2.7.0
> ++
> +-- 
> +2.7.0
> +
> diff --git a/buildscript b/buildscript
> index 508e6ec..41c92d3 100755
> --- a/buildscript
> +++ b/buildscript
> @@ -162,6 +162,9 @@ prepare() {
>      # set default password to 'ffol'
>      patch -p0 -d "$target" -i "$PWD"/build_patches/set_root_password.patch
>  
> +    # fixes odhcpd
> +    patch -p0 -d "$target" -i "$PWD"/build_patches/0001-disable-setting-dns-via-dhcp-if-no-servers-are-given.patch
> +
>      #saves ~200MB for each build
>      test -d ./src/dl || mkdir ./src/dl
>      ln -s ../../src/dl "$target"/dl
> -- 
> 2.7.0
>