パッケージ構成
インストールプログラム: dhcpcd
インストールライブラリ: /usr/lib/dhcpcd/dev/udev.so
インストールディレクトリ: /{usr,var}/lib/dhcpcd, /usr/share/dhcpcd
dhcpcd-10.0.6
dhcpcd の概要
dhcpcd は、RFC2131 にて定義されている DHCP クライアントの実装です。 DHCP クライアントは、DHCP を利用してネットワークアドレスが割り当てられたネットワークへのアクセスに用いられます。 dhcpcd は十分な機能を有すると同時に、大変軽量な DHCP クライアントです。
![[注記]](../images/note.png)
注記
LFS や依存パッケージが本ブックに示す最新安定バージョンでなかった場合には、BLFS 開発版においては、パッケージのビルドや処理実行が適切に行われないことがあります。
パッケージ情報
-
ダウンロード (HTTP): https://github.com/NetworkConfiguration/dhcpcd/releases/download/v10.0.6/dhcpcd-10.0.6.tar.xz
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ダウンロード MD5 sum: ef8356d711b17701928ead7206d15234
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ダウンロードサイズ: 264 KB
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必要ディスク容量: 3.0 MB (with tests)
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概算ビルド時間: 0.1 SBU 以下 (テスト込み)
dhcpcd の依存パッケージ
任意
LLVM-17.0.6 (with Clang), ntp-4.2.8p17, chronyd, and ypbind
Privilege separation
Recent releases of dhcpcd optionally support privilege separation. As the practical security benefits of this are unclear for a program like dhcpcd and the setup is more complicated, the book currently defaults to disable it.
If you however would like to use privilege separation, additional
installation steps are necessary to set up the proper environment.
Issue the following commands as the root user:
install -v -m700 -d /var/lib/dhcpcd &&
groupadd -g 52 dhcpcd &&
useradd -c 'dhcpcd PrivSep' \
-d /var/lib/dhcpcd \
-g dhcpcd \
-s /bin/false \
-u 52 dhcpcd &&
chown -v dhcpcd:dhcpcd /var/lib/dhcpcd
dhcpcd のインストール
Build dhcpcd without privilege separation by running the following command:
./configure --prefix=/usr \
--sysconfdir=/etc \
--libexecdir=/usr/lib/dhcpcd \
--dbdir=/var/lib/dhcpcd \
--runstatedir=/run \
--disable-privsep &&
make
Alternatively, build dhcpcd with privilege separation by running the following commands:
./configure --prefix=/usr \
--sysconfdir=/etc \
--libexecdir=/usr/lib/dhcpcd \
--dbdir=/var/lib/dhcpcd \
--runstatedir=/run \
--privsepuser=dhcpcd &&
make
ビルド結果をテストする場合は make test を実行します。
root ユーザーになって以下を実行します。
make install
コマンド説明
--libexecdir=/usr/lib/dhcpcd: This
switch sets a better location for the dhcpcd internal libraries.
--dbdir=/var/lib/dhcpcd:
This switch adjusts the database directory because the default
directory, /var/db, is not
FHS-compliant.
--runstatedir=/run: This
switch sets the runtime state directory because the default
/var/run is a symbolic link to
/run, and using /var/run is deprecated.
--disable-privsep: This
switch disables privilege separation, which is the default in
dhcpcd. This switch is not used in the build configuration where
privilege separation is used.
--privsepuser=dhcpcd: This
switch sets the privilege separation user in the build
configuration where privilege escalation is used.
--with-hook=...: You can optionally
install more hooks, for example to install some configuration files
such as ntp.conf. A set of hooks can
be found in the dhcpcd-hooks
directory in the build tree.
dhcpcd の設定
全般的な設定情報
If you want to configure network interfaces at boot using
dhcpcd, you need to
install the systemd unit included in blfs-systemd-units-20231205 package by
running the following command as the root user:
make install-dhcpcd
注記
The default
behavior of dhcpcd is to set the hostname
and the mtu. It also overwrites /etc/resolv.conf and /etc/ntp.conf. These modifications to system
configuration files are done by hooks which are stored in
/usr/lib/dhcpcd/dhcpcd-hooks. You
can change this behavior by removing or adding hooks from/to
that directory. The execution of hooks can be disabled by using
the --nohook (-C) command line option or by the nohook option in the /etc/dhcpcd.conf file.
注記
Make sure that you disable the systemd-networkd service or configure it not to manage the interfaces you want to manage with dhcpcd.
At this point you can test if dhcpcd is behaving as expected
by running the following command as the root user:
systemctl start dhcpcd@eth0
To start dhcpcd on
a specific interface at boot, enable the previously installed
systemd unit by running the following command as the root user:
systemctl enable dhcpcd@eth0
Replace eth0 with the
actual interface name.