[246c904] | 1 | <?xml version="1.0" encoding="ISO-8859-1"?>
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[6732c094] | 2 | <!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
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| 3 | "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
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[246c904] | 4 | <!ENTITY % general-entities SYSTEM "../../general.ent">
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| 5 | %general-entities;
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[14d6b3e0] | 6 |
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[33e82b1] | 7 | <!ENTITY dhcpcd-download-http "https://roy.marples.name/downloads/dhcpcd/dhcpcd-&dhcpcd-version;.tar.xz">
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[4183f95] | 8 | <!-- <!ENTITY dhcpcd-download-ftp "ftp://roy.marples.name/pub/dhcpcd/dhcpcd-&dhcpcd-version;.tar.xz">-->
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| 9 | <!ENTITY dhcpcd-download-ftp " ">
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[f713df3] | 10 | <!ENTITY dhcpcd-md5sum "2b2f46648bc96979f96127f0e0e07d9b">
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| 11 | <!ENTITY dhcpcd-size "251 KB">
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[d301fdd] | 12 | <!ENTITY dhcpcd-buildsize "3.6 MB (with tests)">
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[e0a7d67c] | 13 | <!ENTITY dhcpcd-time "less than 0.1 SBU (with tests)">
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[246c904] | 14 | ]>
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[af652fc] | 15 | <!--
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| 16 | Use this URL as ChangeLog:
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[9cee0ec] | 17 | https://roy.marples.name/blog/dhcpcd-9-2-0-released.html
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| 18 | Substitute the 9-2-0 with 9-2-1 or 9-2-2 ...
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[f713df3] | 19 | pierre: seems that it now returns Error 404 (November 2021).
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[af652fc] | 20 | -->
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[246c904] | 21 |
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[fd680fb] | 22 | <sect1 id="dhcpcd" xreflabel="dhcpcd-&dhcpcd-version;">
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[820d164a] | 23 | <?dbhtml filename="dhcpcd.html"?>
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[4839c17] | 24 |
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| 25 |
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[add19ff9] | 26 | <title>dhcpcd-&dhcpcd-version;</title>
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[4839c17] | 27 |
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[820d164a] | 28 | <indexterm zone="dhcpcd">
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[add19ff9] | 29 | <primary sortas="a-dhcpcd">dhcpcd</primary>
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[820d164a] | 30 | </indexterm>
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| 31 |
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| 32 | <sect2 role="package">
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[add19ff9] | 33 | <title>Introduction to dhcpcd</title>
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[820d164a] | 34 |
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[7c56ece] | 35 | <para>
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| 36 | <application>dhcpcd</application> is an implementation of the
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| 37 | DHCP client specified in RFC2131. A DHCP client is useful for connecting
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| 38 | your computer to a network which uses DHCP to assign network
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| 39 | addresses. dhcpcd strives to be a fully featured, yet very lightweight
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| 40 | DHCP client.
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| 41 | </para>
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[4839c17] | 42 |
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[d0c42be] | 43 | &lfs113_checked;
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[77ac0f23] | 44 |
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[820d164a] | 45 | <bridgehead renderas="sect3">Package Information</bridgehead>
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| 46 | <itemizedlist spacing="compact">
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| 47 | <listitem>
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[7c56ece] | 48 | <para>
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| 49 | Download (HTTP): <ulink url="&dhcpcd-download-http;"/>
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| 50 | </para>
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[820d164a] | 51 | </listitem>
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| 52 | <listitem>
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[7c56ece] | 53 | <para>
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| 54 | Download (FTP): <ulink url="&dhcpcd-download-ftp;"/>
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| 55 | </para>
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[820d164a] | 56 | </listitem>
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| 57 | <listitem>
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[7c56ece] | 58 | <para>
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| 59 | Download MD5 sum: &dhcpcd-md5sum;
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| 60 | </para>
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[820d164a] | 61 | </listitem>
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| 62 | <listitem>
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[7c56ece] | 63 | <para>
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| 64 | Download size: &dhcpcd-size;
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| 65 | </para>
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[820d164a] | 66 | </listitem>
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| 67 | <listitem>
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[7c56ece] | 68 | <para>
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| 69 | Estimated disk space required: &dhcpcd-buildsize;
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| 70 | </para>
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[820d164a] | 71 | </listitem>
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| 72 | <listitem>
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[7c56ece] | 73 | <para>
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| 74 | Estimated build time: &dhcpcd-time;
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| 75 | </para>
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[820d164a] | 76 | </listitem>
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| 77 | </itemizedlist>
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[4839c17] | 78 |
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[4edf8452] | 79 | <bridgehead renderas="sect3">dhcpcd Dependencies</bridgehead>
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| 80 |
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| 81 | <bridgehead renderas="sect4">Optional</bridgehead>
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| 82 | <para role="optional">
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[7c56ece] | 83 | <xref linkend="llvm"/> (with Clang),
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| 84 | <xref linkend="ntp"/>,
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| 85 | <ulink url="https://chrony.tuxfamily.org/">chronyd</ulink>, and
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| 86 | <ulink url="https://github.com/thkukuk/ypbind-mt/">ypbind</ulink>
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[4edf8452] | 87 | </para>
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| 88 |
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[7e1f3aa] | 89 | <para condition="html" role="usernotes">User Notes:
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| 90 | <ulink url="&blfs-wiki;/dhcpcd"/></para>
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| 91 |
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[820d164a] | 92 | </sect2>
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[4839c17] | 93 |
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[2115e38] | 94 | <sect2 id='dhcpcd-privsep'>
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| 95 | <title>Privilege separation</title>
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[820d164a] | 96 |
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[05c8448] | 97 | <para>
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[2115e38] | 98 | Recent releases of <application>dhcpcd</application> optionally support
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| 99 | privilege separation. As the practical security benefits of this are
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| 100 | unclear for a program like <application>dhcpcd</application> and the
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| 101 | setup is more complicated, the book currently defaults to disable it.
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| 102 | </para>
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| 103 | <para>
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| 104 | If you however would like to use privilege separation, additional
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| 105 | installation steps are necessary to set up the proper environment. Issue
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| 106 | the following commands as the
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| 107 | <systemitem class="username">root</systemitem> user:
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[05c8448] | 108 | </para>
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| 109 |
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| 110 | <screen role="root"><userinput>install -v -m700 -d /var/lib/dhcpcd &&
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| 111 |
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| 112 | groupadd -g 52 dhcpcd &&
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| 113 | useradd -c 'dhcpcd PrivSep' \
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| 114 | -d /var/lib/dhcpcd \
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| 115 | -g dhcpcd \
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[cb37cb79] | 116 | -s /bin/false \
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[05c8448] | 117 | -u 52 dhcpcd &&
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| 118 | chown -v dhcpcd:dhcpcd /var/lib/dhcpcd </userinput></screen>
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| 119 |
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[2115e38] | 120 | </sect2>
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| 121 |
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| 122 | <sect2 role="installation">
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| 123 | <title>Installation of dhcpcd</title>
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| 124 |
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[d16c71a] | 125 | <para>Fix a runtime error caused by a change in glibc-2.36:</para>
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| 126 |
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| 127 | <screen><userinput>sed '/Deny everything else/i SECCOMP_ALLOW(__NR_getrandom),' \
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| 128 | -i src/privsep-linux.c</userinput></screen>
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| 129 |
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[7c56ece] | 130 | <para>
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[2115e38] | 131 | Build <application>dhcpcd</application> without privilege separation
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| 132 | by running the following command:
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| 133 | </para>
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| 134 |
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| 135 | <screen><userinput>./configure --prefix=/usr \
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| 136 | --sysconfdir=/etc \
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| 137 | --libexecdir=/usr/lib/dhcpcd \
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| 138 | --dbdir=/var/lib/dhcpcd \
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| 139 | --runstatedir=/run \
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| 140 | --disable-privsep &&
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| 141 | make</userinput></screen>
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| 142 |
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| 143 | <para>
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| 144 | Build <application>dhcpcd</application> with privilege separation
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| 145 | by running the following commands:
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[7c56ece] | 146 | </para>
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[820d164a] | 147 |
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[e1d2da5] | 148 | <screen><userinput>./configure --prefix=/usr \
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| 149 | --sysconfdir=/etc \
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| 150 | --libexecdir=/usr/lib/dhcpcd \
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| 151 | --dbdir=/var/lib/dhcpcd \
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[f713df3] | 152 | --runstatedir=/run \
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[e1d2da5] | 153 | --privsepuser=dhcpcd &&
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[f0740ab] | 154 | make</userinput></screen>
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[f9a784a] | 155 |
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[7c56ece] | 156 | <para>
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| 157 | To test the results, issue: <command>make test</command>.
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| 158 | </para>
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[f9a784a] | 159 |
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[7c56ece] | 160 | <para>
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| 161 | Now, as the <systemitem class="username">root</systemitem> user:
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| 162 | </para>
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[f9a784a] | 163 |
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[bfa01156] | 164 | <screen role='root'><userinput>make install</userinput></screen>
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[4839c17] | 165 |
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[690658a5] | 166 | <!--
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[7c56ece] | 167 | <para>
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| 168 | By default, a plain text lease info file isn't created but the
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| 169 | <application>dhcpcd</application> provides a hook which can be used for
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| 170 | creating such a file. Install the hook by running the following commands
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| 171 | as the <systemitem class="username">root</systemitem> user:
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| 172 | </para>
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[232e46a] | 173 |
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[bfa01156] | 174 | <screen role='root'><userinput>sed -i "s;/var/lib;/run;g" dhcpcd-hooks/50-dhcpcd-compat &&
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[f9a784a] | 175 | install -v -m 644 dhcpcd-hooks/50-dhcpcd-compat /lib/dhcpcd/dhcpcd-hooks/</userinput></screen>
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[690658a5] | 176 | -->
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[4839c17] | 177 |
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[820d164a] | 178 | </sect2>
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[4839c17] | 179 |
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[690658a5] | 180 | <sect2 role="commands">
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| 181 | <title>Command Explanations</title>
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| 182 |
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| 183 | <para>
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[e1d2da5] | 184 | <parameter>--libexecdir=/usr/lib/dhcpcd</parameter>: Set a more proper
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| 185 | location for dhcpcd internal libraries.
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[690658a5] | 186 | </para>
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| 187 |
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| 188 | <para>
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[a3ec5c1] | 189 | <parameter>--dbdir=/var/lib/dhcpcd</parameter>: The default
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| 190 | <filename class="directory">/var/db</filename> is not FHS-compliant
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[690658a5] | 191 | </para>
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| 192 |
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[f713df3] | 193 | <para>
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| 194 | <parameter>--runstatedir=/run</parameter>: The default
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| 195 | <filename class="directory">/var/run</filename> is a symbolic
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| 196 | link to <filename class="directory">/run</filename>.
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| 197 | </para>
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| 198 |
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[690658a5] | 199 | <para>
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| 200 | <option>--with-hook=...</option>: You can optionally install more hooks,
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| 201 | for example to install some configuration files such as
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| 202 | <filename>ntp.conf</filename>. The set of hooks is in the
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| 203 | <filename class="directory">dhcpcd-hooks</filename> directory in the
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| 204 | build tree.
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| 205 | </para>
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[2115e38] | 206 |
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| 207 | <para>
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[bb4b217d] | 208 | <parameter>--disable-privsep</parameter>: Do not use privilege separation,
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[2115e38] | 209 | which is the default.
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| 210 | </para>
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| 211 |
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| 212 | <para>
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[bb4b217d] | 213 | <parameter>--privsepuser=dhcpcd</parameter>: Use this unprivileged user
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[2115e38] | 214 | in a privilege separation setup.
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| 215 | </para>
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| 216 |
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| 217 | <para>
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| 218 | <option>--with-hook=...</option>: You can optionally install more hooks,
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| 219 | for example to install some configuration files such as
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| 220 | <filename>ntp.conf</filename>. The set of hooks is in the
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| 221 | <filename class="directory">dhcpcd-hooks</filename> directory in the
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| 222 | build tree.
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| 223 | </para>
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[690658a5] | 224 | </sect2>
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| 225 |
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[820d164a] | 226 | <sect2 role="configuration">
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[add19ff9] | 227 | <title>Configuring dhcpcd</title>
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[820d164a] | 228 |
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| 229 | <sect3 id="dhcpcd-config">
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| 230 | <title>Config Files</title>
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[4839c17] | 231 |
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[7c56ece] | 232 | <para>
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| 233 | <filename>/etc/dhcpcd.conf</filename>
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| 234 | </para>
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[4839c17] | 235 |
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[820d164a] | 236 | <indexterm zone="dhcpcd dhcpcd-config">
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[fefa337] | 237 | <primary sortas="e-etc-dhcpcd-dhcpcd-conf">/etc/dhcpcd/dhcpcd.conf</primary>
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[820d164a] | 238 | </indexterm>
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[4839c17] | 239 |
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[820d164a] | 240 | </sect3>
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| 241 |
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[3c7bd00] | 242 | <sect3 id="dhcpcd-init" revision="sysv">
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[e5f38d6b] | 243 | <title>General Configuration Information</title>
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[820d164a] | 244 |
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[7c56ece] | 245 | <para>
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| 246 | To configure <command>dhcpcd</command>, you need to first install
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| 247 | the network service script,
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[e1d2da5] | 248 | <filename>/usr/lib/services/dhcpcd</filename>
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[7c56ece] | 249 | included in the <xref linkend="bootscripts"/> package
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| 250 | (as user <systemitem class="username">root</systemitem>):
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| 251 | </para>
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[4839c17] | 252 |
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[820d164a] | 253 | <indexterm zone="dhcpcd dhcpcd-init">
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| 254 | <primary sortas="f-dhcpcd">dhcpcd (service script)</primary>
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| 255 | </indexterm>
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| 256 |
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| 257 | <screen role='root'><userinput>make install-service-dhcpcd</userinput></screen>
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| 258 |
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[05c8448] | 259 | <note>
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| 260 | <para id="dhcpcd-config6">
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[e1d2da5] | 261 | the network service script <filename>/usr/lib/services/dhcpcd</filename>
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[05c8448] | 262 | contained in bootscripts up to blfs-bootscripts-20191204 is
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| 263 | not compatible with latest dhcpcd, as the location of the pidfile
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| 264 | changed.
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| 265 | To work around this, issue the following command:
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| 266 |
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| 267 | <screen role='root'><userinput>sed -i "s;/run/dhcpcd-;/run/dhcpcd/;g" /lib/services/dhcpcd</userinput></screen>
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| 268 | </para>
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| 269 | </note>
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| 270 |
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[7c56ece] | 271 | <note>
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| 272 | <para id="dhcpcd-config3">
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| 273 | The default for <command>dhcpcd</command> is to set the hostname
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| 274 | and mtu. It also overwrites <filename>/etc/resolv.conf </filename>
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| 275 | and <filename>/etc/ntp.conf</filename>. These
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| 276 | modifications to system files are done by hooks which are stored in
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[e1d2da5] | 277 | <filename class="directory">/usr/lib/dhcpcd/dhcpcd-hooks</filename>.
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[b59e5eb3] | 278 | Set up <command>dhcpcd</command> by removing or adding hooks from/to
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[7c56ece] | 279 | that directory. The execution of hooks can be disabled by using
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| 280 | the <option>--nohook</option> (<option>-C</option>) command line
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| 281 | option or by the <option>nohook</option> option in the
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| 282 | <filename>/etc/dhcpcd.conf</filename> file.
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| 283 | </para>
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| 284 | </note>
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[232e46a] | 285 |
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[7c56ece] | 286 | <para id="dhcpcd-config2">
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| 287 | Finally, as the <systemitem class="username">root</systemitem> user
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| 288 | create the <filename>/etc/sysconfig/ifconfig.eth0</filename>
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| 289 | configuration file using the following commands. Adjust appropriately
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| 290 | for additional interfaces:
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| 291 | </para>
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[4839c17] | 292 |
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[820d164a] | 293 | <indexterm zone="dhcpcd dhcpcd-config2">
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[f0740ab] | 294 | <primary sortas="e-etc-sysconfig-dhcpcd">/etc/sysconfig/ifconfig.eth0 (dhcpcd)</primary>
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[820d164a] | 295 | </indexterm>
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| 296 |
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[f0740ab] | 297 | <screen role='root'><userinput>cat > /etc/sysconfig/ifconfig.eth0 << "EOF"
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[820d164a] | 298 | <literal>ONBOOT="yes"
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[f0740ab] | 299 | IFACE="eth0"
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[afa198d] | 300 | SERVICE="dhcpcd"
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[9f44beb] | 301 | DHCP_START="-b -q -h ''<replaceable><insert appropriate start options here></replaceable>"
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[f0740ab] | 302 | DHCP_STOP="-k <replaceable><insert additional stop options here></replaceable>"</literal>
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[820d164a] | 303 | EOF</userinput></screen>
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| 304 |
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[7c56ece] | 305 | <para>
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| 306 | For more information on the appropriate <envar>DHCP_START</envar> and
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| 307 | <envar>DHCP_STOP</envar> values, examine the man page for
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| 308 | <command>dhcpcd</command>.
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| 309 | </para>
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[4839c17] | 310 |
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[820d164a] | 311 | <indexterm zone="dhcpcd dhcpcd-config3">
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| 312 | <primary sortas="e-etc-resolv.conf">/etc/resolv.conf</primary>
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| 313 | </indexterm>
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| 314 | </sect3>
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[4839c17] | 315 |
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[3c7bd00] | 316 | <sect3 id="dhcpcd-init2" revision="sysv">
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[e5f38d6b] | 317 | <title>Configuration Information: fixed ip</title>
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| 318 |
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[7c56ece] | 319 | <para id="dhcpcd-config4">
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| 320 | Although not usual, it is possible that you need
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[e5f38d6b] | 321 | to configure <application>dhcpcd</application> to use a fixed ip. Here,
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| 322 | we give an example. As the
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| 323 | <systemitem class="username">root</systemitem> user create the
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| 324 | <filename>/etc/sysconfig/ifconfig.eth0</filename> configuration file
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| 325 | using the following commands. Adjust appropriately for additional
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[7c56ece] | 326 | interfaces and for the actual ip and router you need:
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| 327 | </para>
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[e5f38d6b] | 328 |
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| 329 | <indexterm zone="dhcpcd dhcpcd-config4">
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| 330 | <primary sortas="e-etc-sysconfig-dhcpcd">/etc/sysconfig/ifconfig.eth0 (dhcpcd)</primary>
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| 331 | </indexterm>
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| 332 |
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[7c56ece] | 333 | <screen role='nodump'><userinput>cat > /etc/sysconfig/ifconfig.eth0 << "EOF"
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[e5f38d6b] | 334 | <literal>ONBOOT="yes"
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| 335 | IFACE="eth0"
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| 336 | SERVICE="dhcpcd"
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| 337 | DHCP_START="-b -q -S ip_address=192.168.0.10/24 -S routers=192.168.0.1"
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| 338 | DHCP_STOP="-k"</literal>
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| 339 | EOF</userinput></screen>
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| 340 |
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[7c56ece] | 341 | <para>
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| 342 | You can either use DNS servers in
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[0840866] | 343 | <filename>/etc/resolv.conf</filename> from another system, your
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| 344 | preferred servers, or just the example
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[7c56ece] | 345 | <filename>/etc/resolv.conf.head</filename> file below as is:
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| 346 | </para>
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[e5f38d6b] | 347 |
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[7c56ece] | 348 | <screen role='nodump'><userinput>cat > /etc/resolv.conf.head << "EOF"
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[e5f38d6b] | 349 | <literal># OpenDNS servers
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| 350 | nameserver 208.67.222.222
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| 351 | nameserver 208.67.220.220</literal>
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| 352 | EOF</userinput></screen>
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| 353 |
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| 354 | </sect3>
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| 355 |
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[138bdf6] | 356 | <sect3 id="dhcpcd-init3" revision="systemd">
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| 357 | <title>General Configuration Information</title>
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| 358 |
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| 359 | <para>
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| 360 | If you want to configure network interfaces at boot using
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| 361 | <command>dhcpcd</command>, you need to install the
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| 362 | systemd unit included in <xref linkend="systemd-units"/>
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| 363 | package by running the following command as the
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| 364 | <systemitem class="username">root</systemitem> user:
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| 365 | </para>
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| 366 |
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| 367 | <screen role="root"><userinput>make install-dhcpcd</userinput></screen>
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| 368 |
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| 369 | <indexterm zone="dhcpcd dhcpcd-init3">
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| 370 | <primary sortas="f-dhcpcd">dhcpcd</primary>
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| 371 | </indexterm>
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| 372 |
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| 373 | <note>
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[7c56ece] | 374 | <para id="dhcpcd-config5">
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| 375 | The default behavior of <command>dhcpcd</command> is to set the
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| 376 | hostname and the mtu. It also overwrites <filename>/etc/resolv.conf
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| 377 | </filename> and <filename>/etc/ntp.conf</filename>. These
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| 378 | modifications to system configuration files are done by hooks which
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| 379 | are stored in <filename class="directory">
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[b59e5eb3] | 380 | /lib/dhcpcd/dhcpcd-hooks</filename>. Set up <command>dhcpcd</command>
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[7c56ece] | 381 | by removing or adding hooks from/to that directory. The execution
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| 382 | of hooks can be disabled by using the <option>--nohook</option>
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| 383 | (<option>-C</option>) command line option or by the
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| 384 | <option>nohook</option> option in the <filename>/etc/dhcpcd.conf
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| 385 | </filename> file.
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| 386 | </para>
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[138bdf6] | 387 | </note>
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| 388 |
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| 389 | <indexterm zone="dhcpcd dhcpcd-config5">
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| 390 | <primary sortas="e-etc-resolv.conf">/etc/resolv.conf</primary>
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| 391 | </indexterm>
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| 392 |
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[7c56ece] | 393 | <note>
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| 394 | <para>
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| 395 | Make sure that you disable the <command>systemd-networkd</command>
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| 396 | service or configure it not to manage the interfaces you want to
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| 397 | manage with <application>dhcpcd</application>.
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| 398 | </para>
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| 399 | </note>
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[138bdf6] | 400 |
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| 401 | <para>
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| 402 | At this point you can test if <command>dhcpcd</command> is
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| 403 | behaving as expected by running the following command as the
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| 404 | <systemitem class="username">root</systemitem> user:
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| 405 | </para>
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| 406 |
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| 407 | <screen role="root"><userinput>systemctl start dhcpcd@<replaceable>eth0</replaceable></userinput></screen>
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| 408 |
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| 409 | <para>
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| 410 | To start <command>dhcpcd</command> on a specific interface
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| 411 | at boot, enable the previously installed systemd unit by
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| 412 | running the following command as the
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| 413 | <systemitem class="username">root</systemitem> user:
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| 414 | </para>
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| 415 |
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| 416 | <screen role="root"><userinput>systemctl enable dhcpcd@<replaceable>eth0</replaceable></userinput></screen>
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| 417 |
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| 418 | <para>
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| 419 | Replace <replaceable>eth0</replaceable> with the actual interface name.
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| 420 | </para>
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| 421 |
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| 422 | </sect3>
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| 423 |
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[820d164a] | 424 | </sect2>
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[4839c17] | 425 |
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[820d164a] | 426 | <sect2 role="content">
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| 427 | <title>Contents</title>
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| 428 |
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| 429 | <segmentedlist>
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| 430 | <segtitle>Installed Program</segtitle>
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[d81eda8] | 431 | <segtitle>Installed Library</segtitle>
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[b1d305ed] | 432 | <segtitle>Installed Directory</segtitle>
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[4839c17] | 433 |
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[820d164a] | 434 | <seglistitem>
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| 435 | <seg>dhcpcd</seg>
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[e1d2da5] | 436 | <seg>/usr/lib/dhcpcd/dev/udev.so</seg>
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| 437 | <seg>/{usr,var}/lib/dhcpcd and /usr/share/dhcpcd</seg>
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[820d164a] | 438 | </seglistitem>
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| 439 | </segmentedlist>
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[4839c17] | 440 |
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[820d164a] | 441 | <variablelist>
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| 442 | <bridgehead renderas="sect3">Short Descriptions</bridgehead>
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| 443 | <?dbfo list-presentation="list"?>
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| 444 | <?dbhtml list-presentation="table"?>
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[4839c17] | 445 |
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[820d164a] | 446 | <varlistentry id="dhcpcd-prog">
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| 447 | <term><command>dhcpcd</command></term>
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| 448 | <listitem>
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[7c56ece] | 449 | <para>
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[4c24eb0a] | 450 | is an implementation of the DHCP client specified in RFC2131
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[7c56ece] | 451 | </para>
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[820d164a] | 452 | <indexterm zone="dhcpcd dhcpcd-prog">
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| 453 | <primary sortas="b-dhcpcd">dhcpcd</primary>
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| 454 | </indexterm>
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| 455 | </listitem>
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| 456 | </varlistentry>
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[4839c17] | 457 |
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[81f1de4] | 458 | <varlistentry id="dhcpcd-udev">
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| 459 | <term><filename class="libraryfile">udev.so</filename></term>
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| 460 | <listitem>
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| 461 | <para>
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[c93c9bf4] | 462 | adds udev support for interface arrival and departure; this is
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[81f1de4] | 463 | because udev likes to rename the interface, which it can't do if
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[4c24eb0a] | 464 | dhcpcd grabs it first
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[81f1de4] | 465 | </para>
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| 466 | <indexterm zone="dhcpcd dhcpcd-udev">
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| 467 | <primary sortas="c-dhcpcd-udev">udev.so</primary>
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| 468 | </indexterm>
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| 469 | </listitem>
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| 470 | </varlistentry>
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| 471 |
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[820d164a] | 472 | </variablelist>
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| 473 |
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| 474 | </sect2>
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[f45b1953] | 475 |
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| 476 | </sect1>
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