[PATCH 1/2] network: dhcp before parsing specified dns through cmdline

[PATCH 1/2] network: dhcp before parsing specified dns through cmdline

[Xunlei Pang]

I met a problem when passing kdump dns to dracut via "nameserver=x.x.x.x",
the dns I provided didn't appear in the "/etc/resolv.conf".

After some debugging, found that when setup dhcp DNS, in setup_interface() 
and setup_interface6(), it has:
    echo "search $search $domain" > /tmp/net.$netif.resolv.conf

So if "$search $domain" isn't NULL(this is ture in my kdump environment),
the dns contents(that is, dns1, dns2, nameserver) in "ifup" before dhcp 
will be discarded.

This patch addresses it by handling dhcp first. In fact this is also the
way the NetworkManager in 1st kernel works.

Signed-off-by: Xunlei Pang <xlpang-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
---
 modules.d/40network/ifup.sh | 32 ++++++++++++++++----------------
 1 file changed, 16 insertions(+), 16 deletions(-)

diff --git a/modules.d/40network/ifup.sh b/modules.d/40network/ifup.sh
index 7c179bd..702b8dc 100755
--- a/modules.d/40network/ifup.sh
+++ b/modules.d/40network/ifup.sh
@@ -321,16 +321,16 @@ fi
 ip=$(getarg ip)
 
 if [ -z "$NO_AUTO_DHCP" ] && [ -z "$ip" ]; then
-    for s in $(getargs nameserver); do
-        [ -n "$s" ] || continue
-        echo nameserver $s >> /tmp/net.$netif.resolv.conf
-    done
-
     if [ "$netroot" = "dhcp6" ]; then
         do_dhcp -6
     else
         do_dhcp -4
     fi
+
+    for s in $(getargs nameserver); do
+        [ -n "$s" ] || continue
+        echo nameserver $s >> /tmp/net.$netif.resolv.conf
+    done
 fi
 
 
@@ -355,17 +355,6 @@ for p in $(getargs ip=); do
     # If this option isn't directed at our interface, skip it
     [ -n "$dev" ] && [ "$dev" != "$netif" ] && continue
 
-    # setup nameserver
-    for s in "$dns1" "$dns2" $(getargs nameserver); do
-        [ -n "$s" ] || continue
-        echo nameserver $s >> /tmp/net.$netif.resolv.conf
-    done
-
-    # Store config for later use
-    for i in ip srv gw mask hostname macaddr mtu dns1 dns2; do
-        eval '[ "$'$i'" ] && echo '$i'="$'$i'"'
-    done > /tmp/net.$netif.override
-
     for autoopt in $(str_replace "$autoconf" "," " "); do
         case $autoopt in
             dhcp|on|any)
@@ -381,6 +370,17 @@ for p in $(getargs ip=); do
     done
     ret=$?
 
+    # setup nameserver
+    for s in "$dns1" "$dns2" $(getargs nameserver); do
+        [ -n "$s" ] || continue
+        echo nameserver $s >> /tmp/net.$netif.resolv.conf
+    done
+
+    # Store config for later use
+    for i in ip srv gw mask hostname macaddr mtu dns1 dns2; do
+        eval '[ "$'$i'" ] && echo '$i'="$'$i'"'
+    done > /tmp/net.$netif.override
+
     if [ $ret -eq 0 ]; then
         > /tmp/net.${netif}.up
 
-- 
1.8.3.1

[PATCH 2/2] network/net-lib.sh: delete duplicated DNS items from "/etc/resolv.conf"

[Xunlei Pang]

Users can pass the DNS information throught "nameserver=" cmdline,
there maybe duplicated inputs.

"/etc/resolv.conf" have some restrictions on the number of DNS items
effective, so make sure that this file contains no duplicated items.

We achieve this by simply making the file have no duplicated lines.

Signed-off-by: Xunlei Pang <xlpang-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
---
 modules.d/40network/module-setup.sh | 2 +-
 modules.d/40network/net-lib.sh      | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/modules.d/40network/module-setup.sh b/modules.d/40network/module-setup.sh
index 4bf93cc..53b4b60 100755
--- a/modules.d/40network/module-setup.sh
+++ b/modules.d/40network/module-setup.sh
@@ -23,7 +23,7 @@ installkernel() {
 # called by dracut
 install() {
     local _arch _i _dir
-    inst_multiple ip arping dhclient sed
+    inst_multiple ip arping dhclient sed awk
     inst_multiple -o ping ping6
     inst_multiple -o brctl
     inst_multiple -o teamd teamdctl teamnl
diff --git a/modules.d/40network/net-lib.sh b/modules.d/40network/net-lib.sh
index 31f1a56..005ad1b 100755
--- a/modules.d/40network/net-lib.sh
+++ b/modules.d/40network/net-lib.sh
@@ -120,7 +120,7 @@ setup_net() {
     [ -e /tmp/dhclient.$netif.dhcpopts ] && . /tmp/dhclient.$netif.dhcpopts
     # set up resolv.conf
     [ -e /tmp/net.$netif.resolv.conf ] && \
-        cp -f /tmp/net.$netif.resolv.conf /etc/resolv.conf
+        awk '!array[$0]++' /tmp/net.$netif.resolv.conf > /etc/resolv.conf
     [ -e /tmp/net.$netif.gw ]            && . /tmp/net.$netif.gw
 
     # add static route
-- 
1.8.3.1

Re: [PATCH 2/2] network/net-lib.sh: delete duplicated DNS items from "/etc/resolv.conf"

[Dracut GitHub Import Bot]

Patchset imported to github.
Pull request:
<https://github.com/haraldh/dracut/compare/master...dracut-mailing-devs:1461665111-7385-2-git-send-email-xlpang%40redhat.com>

Re: [PATCH 1/2] network: dhcp before parsing specified dns through cmdline

[Harald Hoyer]

Am 26.04.2016 um 12:05 schrieb Xunlei Pang:
> I met a problem when passing kdump dns to dracut via "nameserver=x.x.x.x",
> the dns I provided didn't appear in the "/etc/resolv.conf".
> 
> After some debugging, found that when setup dhcp DNS, in setup_interface() 
> and setup_interface6(), it has:
>     echo "search $search $domain" > /tmp/net.$netif.resolv.conf
> 
> So if "$search $domain" isn't NULL(this is ture in my kdump environment),
> the dns contents(that is, dns1, dns2, nameserver) in "ifup" before dhcp 
> will be discarded.
> 
> This patch addresses it by handling dhcp first. In fact this is also the
> way the NetworkManager in 1st kernel works.
> 
> Signed-off-by: Xunlei Pang <xlpang-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
> ---
>  modules.d/40network/ifup.sh | 32 ++++++++++++++++----------------
>  1 file changed, 16 insertions(+), 16 deletions(-)
> 
> diff --git a/modules.d/40network/ifup.sh b/modules.d/40network/ifup.sh
> index 7c179bd..702b8dc 100755
> --- a/modules.d/40network/ifup.sh
> +++ b/modules.d/40network/ifup.sh
> @@ -321,16 +321,16 @@ fi
>  ip=$(getarg ip)
>  
>  if [ -z "$NO_AUTO_DHCP" ] && [ -z "$ip" ]; then
> -    for s in $(getargs nameserver); do
> -        [ -n "$s" ] || continue
> -        echo nameserver $s >> /tmp/net.$netif.resolv.conf
> -    done
> -
>      if [ "$netroot" = "dhcp6" ]; then
>          do_dhcp -6
>      else
>          do_dhcp -4
>      fi
> +
> +    for s in $(getargs nameserver); do
> +        [ -n "$s" ] || continue
> +        echo nameserver $s >> /tmp/net.$netif.resolv.conf
> +    done
>  fi
>  
>  
> @@ -355,17 +355,6 @@ for p in $(getargs ip=); do
>      # If this option isn't directed at our interface, skip it
>      [ -n "$dev" ] && [ "$dev" != "$netif" ] && continue
>  
> -    # setup nameserver
> -    for s in "$dns1" "$dns2" $(getargs nameserver); do
> -        [ -n "$s" ] || continue
> -        echo nameserver $s >> /tmp/net.$netif.resolv.conf
> -    done
> -
> -    # Store config for later use
> -    for i in ip srv gw mask hostname macaddr mtu dns1 dns2; do
> -        eval '[ "$'$i'" ] && echo '$i'="$'$i'"'
> -    done > /tmp/net.$netif.override
> -
>      for autoopt in $(str_replace "$autoconf" "," " "); do
>          case $autoopt in
>              dhcp|on|any)
> @@ -381,6 +370,17 @@ for p in $(getargs ip=); do
>      done
>      ret=$?
>  
> +    # setup nameserver
> +    for s in "$dns1" "$dns2" $(getargs nameserver); do
> +        [ -n "$s" ] || continue
> +        echo nameserver $s >> /tmp/net.$netif.resolv.conf
> +    done
> +
> +    # Store config for later use
> +    for i in ip srv gw mask hostname macaddr mtu dns1 dns2; do
> +        eval '[ "$'$i'" ] && echo '$i'="$'$i'"'
> +    done > /tmp/net.$netif.override
> +
>      if [ $ret -eq 0 ]; then
>          > /tmp/net.${netif}.up
>  
> 

Thanks! Pushed

Re: [PATCH 2/2] network/net-lib.sh: delete duplicated DNS items from "/etc/resolv.conf"

[Harald Hoyer]

Am 26.04.2016 um 12:05 schrieb Xunlei Pang:
> Users can pass the DNS information throught "nameserver=" cmdline,
> there maybe duplicated inputs.
> 
> "/etc/resolv.conf" have some restrictions on the number of DNS items
> effective, so make sure that this file contains no duplicated items.
> 
> We achieve this by simply making the file have no duplicated lines.
> 
> Signed-off-by: Xunlei Pang <xlpang-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
> ---
>  modules.d/40network/module-setup.sh | 2 +-
>  modules.d/40network/net-lib.sh      | 2 +-
>  2 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/modules.d/40network/module-setup.sh b/modules.d/40network/module-setup.sh
> index 4bf93cc..53b4b60 100755
> --- a/modules.d/40network/module-setup.sh
> +++ b/modules.d/40network/module-setup.sh
> @@ -23,7 +23,7 @@ installkernel() {
>  # called by dracut
>  install() {
>      local _arch _i _dir
> -    inst_multiple ip arping dhclient sed
> +    inst_multiple ip arping dhclient sed awk
>      inst_multiple -o ping ping6
>      inst_multiple -o brctl
>      inst_multiple -o teamd teamdctl teamnl
> diff --git a/modules.d/40network/net-lib.sh b/modules.d/40network/net-lib.sh
> index 31f1a56..005ad1b 100755
> --- a/modules.d/40network/net-lib.sh
> +++ b/modules.d/40network/net-lib.sh
> @@ -120,7 +120,7 @@ setup_net() {
>      [ -e /tmp/dhclient.$netif.dhcpopts ] && . /tmp/dhclient.$netif.dhcpopts
>      # set up resolv.conf
>      [ -e /tmp/net.$netif.resolv.conf ] && \
> -        cp -f /tmp/net.$netif.resolv.conf /etc/resolv.conf
> +        awk '!array[$0]++' /tmp/net.$netif.resolv.conf > /etc/resolv.conf
>      [ -e /tmp/net.$netif.gw ]            && . /tmp/net.$netif.gw
>  
>      # add static route
> 

Thanks! Pushed, although replaced awk with a shell function