From mboxrd@z Thu Jan 1 00:00:00 1970 From: Scott James Remnant Date: Tue, 20 Jan 2009 21:41:16 +0000 Subject: [PATCH] Allow user and group lookup to be disabled. Message-Id: <1232487676.23851.54.camel@quest> MIME-Version: 1 Content-Type: multipart/mixed; boundary="=-TOUJeIrnqbMyMOiKpUec" List-Id: To: linux-hotplug@vger.kernel.org --=-TOUJeIrnqbMyMOiKpUec Content-Type: text/plain Content-Transfer-Encoding: quoted-printable In certain cut-down situations such as an installer or inside the initramfs, we simply don't have any kind of name service. While we could use rules without OWNER or GROUP, it's better to have the same rules as a full system and have udevd ignore those parts of the rules. Adds a --resolve-names=3Dnever switch to udevd that has this effect. --- NEWS | 3 +++ udev/udev-rules.c | 8 ++++---- udev/udevd.c | 19 ++++++++++++++++--- udev/udevd.xml | 11 +++++++++++ 4 files changed, 34 insertions(+), 7 deletions(-) diff --git a/NEWS b/NEWS index bcfd773..52bfa6a 100644 --- a/NEWS +++ b/NEWS @@ -5,6 +5,9 @@ Bugfixes. The udevadm test command has no longer a --force option, nodes and symlinks are always updated with a test run now. =20 +The udevd daemon can be started with --resolve-names=3Dnever to avoid all user +and group lookups (e.g. in cut-down systems). + udev 136 =3D=3D=3D=3D=3D=3D=3D=3D Bugfixes. diff --git a/udev/udev-rules.c b/udev/udev-rules.c index 2d120dd..ccf1eaa 100644 --- a/udev/udev-rules.c +++ b/udev/udev-rules.c @@ -1454,10 +1454,10 @@ static int add_rule(struct udev_rules *rules, char *line, uid =3D strtoul(value, &endptr, 10); if (endptr[0] =3D=3D '\0') { rule_add_key(&rule_tmp, TK_A_OWNER_ID, op, NULL, &uid); - } else if (rules->resolve_names && strchr("$%", value[0]) =3D=3D NULL) = { + } else if ((rules->resolve_names > 0) && strchr("$%", value[0]) =3D=3D NULL) { uid =3D add_uid(rules, value); rule_add_key(&rule_tmp, TK_A_OWNER_ID, op, NULL, &uid); - } else { + } else if (rules->resolve_names =3D=3D 0) { rule_add_key(&rule_tmp, TK_A_OWNER, op, value, NULL); } rule_tmp.rule.rule.flags =3D 1; @@ -1472,10 +1472,10 @@ static int add_rule(struct udev_rules *rules, char *line, gid =3D strtoul(value, &endptr, 10); if (endptr[0] =3D=3D '\0') { rule_add_key(&rule_tmp, TK_A_GROUP_ID, op, NULL, &gid); - } else if (rules->resolve_names && strchr("$%", value[0]) =3D=3D NULL) = { + } else if ((rules->resolve_names > 0) && strchr("$%", value[0]) =3D=3D NULL) { gid =3D add_gid(rules, value); rule_add_key(&rule_tmp, TK_A_GROUP_ID, op, NULL, &gid); - } else { + } else if (rules->resolve_names =3D=3D 0) { rule_add_key(&rule_tmp, TK_A_GROUP, op, value, NULL); } rule_tmp.rule.rule.flags =3D 1; diff --git a/udev/udevd.c b/udev/udevd.c index 993964d..9a8d791 100644 --- a/udev/udevd.c +++ b/udev/udevd.c @@ -639,12 +639,14 @@ int main(int argc, char *argv[]) fd_set readfds; const char *value; int daemonize =3D 0; + int resolve_names =3D 1; static const struct option options[] =3D { { "daemon", no_argument, NULL, 'd' }, { "debug-trace", no_argument, NULL, 't' }, { "debug", no_argument, NULL, 'D' }, { "help", no_argument, NULL, 'h' }, { "version", no_argument, NULL, 'V' }, + { "resolve-names", required_argument, NULL, 'N' }, {} }; int rc =3D 1; @@ -678,8 +680,19 @@ int main(int argc, char *argv[]) if (udev_get_log_priority(udev) < LOG_INFO) udev_set_log_priority(udev, LOG_INFO); break; + case 'N': + if (strcmp (optarg, "early") =3D=3D 0) { + resolve_names =3D 1; + } else if (strcmp (optarg, "never") =3D=3D 0) { + resolve_names =3D -1; + } else { + fprintf(stderr, "resolve-names must be early or never\n"); + err(udev, "resolve-names must be early or never\n"); + goto exit; + } + break; case 'h': - printf("Usage: udevd [--help] [--daemon] [--debug-trace] [--debug] [--version]\n"); + printf("Usage: udevd [--help] [--daemon] [--debug-trace] [--debug] [--resolve-names=3Dearly|never] [--version]\n"); goto exit; case 'V': printf("%s\n", VERSION); @@ -759,7 +772,7 @@ int main(int argc, char *argv[]) goto exit; } =20 - rules =3D udev_rules_new(udev, 1); + rules =3D udev_rules_new(udev, resolve_names); if (rules =3D=3D NULL) { err(udev, "error reading rules\n"); goto exit; @@ -957,7 +970,7 @@ int main(int argc, char *argv[]) struct udev_rules *rules_new; =20 reload_config =3D 0; - rules_new =3D udev_rules_new(udev, 1); + rules_new =3D udev_rules_new(udev, resolve_names); if (rules_new !=3D NULL) { udev_rules_unref(rules); rules =3D rules_new; diff --git a/udev/udevd.xml b/udev/udevd.xml index b5726b8..010411c 100644 --- a/udev/udevd.xml +++ b/udev/udevd.xml @@ -29,6 +29,7 @@ + @@ -65,6 +66,16 @@ + + + Specify when udevd should resolve names of users and groups. + When set to (the default) names will be + resolved when the rules are parsed. + When set to names will never be resolved + and all devices will be owned by root. + + + Print version number. --=20 1.6.0.5 --=20 Scott James Remnant scott@ubuntu.com --=-TOUJeIrnqbMyMOiKpUec Content-Type: application/pgp-signature; name="signature.asc" Content-Description: This is a digitally signed message part -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (GNU/Linux) iEYEABECAAYFAkl2RPwACgkQSnQiFMl4yK5q6wCdE5wfJBTRq7X6eb7Z9pX/Z3aX TuwAoJhYOxhJPvorLGGszhtoHVbfBF3T =8PTp -----END PGP SIGNATURE----- --=-TOUJeIrnqbMyMOiKpUec--