429 lines
12 KiB
C
429 lines
12 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/***
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This file is part of systemd.
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Copyright 2010 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include "cgroup-util.h"
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#include "formats-util.h"
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#include "macro.h"
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#include "specifier.h"
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#include "string-util.h"
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#include "strv.h"
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#include "unit-name.h"
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#include "unit.h"
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#include "unit-printf.h"
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static int specifier_prefix_and_instance(char specifier, void *data, void *userdata, char **ret) {
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Unit *u = userdata;
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assert(u);
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return unit_name_to_prefix_and_instance(u->id, ret);
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}
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static int specifier_prefix(char specifier, void *data, void *userdata, char **ret) {
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Unit *u = userdata;
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assert(u);
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return unit_name_to_prefix(u->id, ret);
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}
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static int specifier_prefix_unescaped(char specifier, void *data, void *userdata, char **ret) {
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_cleanup_free_ char *p = NULL;
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Unit *u = userdata;
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int r;
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assert(u);
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r = unit_name_to_prefix(u->id, &p);
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if (r < 0)
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return r;
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return unit_name_unescape(p, ret);
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}
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static int specifier_instance_unescaped(char specifier, void *data, void *userdata, char **ret) {
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Unit *u = userdata;
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assert(u);
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if (!u->instance)
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return -EINVAL;
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return unit_name_unescape(u->instance, ret);
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}
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static int specifier_filename(char specifier, void *data, void *userdata, char **ret) {
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Unit *u = userdata;
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assert(u);
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if (u->instance)
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return unit_name_path_unescape(u->instance, ret);
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else
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return unit_name_to_path(u->id, ret);
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}
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static int specifier_cgroup(char specifier, void *data, void *userdata, char **ret) {
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Unit *u = userdata;
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char *n;
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assert(u);
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if (u->cgroup_path)
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n = strdup(u->cgroup_path);
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else
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n = unit_default_cgroup_path(u);
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if (!n)
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return -ENOMEM;
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*ret = n;
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return 0;
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}
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static int specifier_cgroup_root(char specifier, void *data, void *userdata, char **ret) {
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Unit *u = userdata;
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char *n;
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assert(u);
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n = strdup(u->manager->cgroup_root);
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if (!n)
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return -ENOMEM;
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*ret = n;
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return 0;
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}
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static int specifier_cgroup_slice(char specifier, void *data, void *userdata, char **ret) {
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Unit *u = userdata;
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char *n;
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assert(u);
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if (UNIT_ISSET(u->slice)) {
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Unit *slice;
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slice = UNIT_DEREF(u->slice);
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if (slice->cgroup_path)
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n = strdup(slice->cgroup_path);
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else
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n = unit_default_cgroup_path(slice);
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} else
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n = strdup(u->manager->cgroup_root);
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*ret = n;
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return 0;
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}
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static int specifier_runtime(char specifier, void *data, void *userdata, char **ret) {
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Unit *u = userdata;
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const char *e;
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char *n = NULL;
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assert(u);
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if (u->manager->running_as == MANAGER_SYSTEM)
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e = "/run";
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else {
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e = getenv("XDG_RUNTIME_DIR");
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if (!e)
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return -EOPNOTSUPP;
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}
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n = strdup(e);
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if (!n)
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return -ENOMEM;
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*ret = n;
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return 0;
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}
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static int specifier_user_name(char specifier, void *data, void *userdata, char **ret) {
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char *printed = NULL;
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Unit *u = userdata;
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ExecContext *c;
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int r = 0;
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assert(u);
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c = unit_get_exec_context(u);
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if (!c)
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return -EINVAL;
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if (u->manager->running_as == MANAGER_SYSTEM) {
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/* We cannot use NSS from PID 1, hence try to make the
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* best of it in that case, and fail if we can't help
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* it */
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if (!c->user || streq(c->user, "root") || streq(c->user, "0"))
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printed = strdup(specifier == 'u' ? "root" : "0");
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else {
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if (specifier == 'u')
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printed = strdup(c->user);
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else {
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uid_t uid;
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r = parse_uid(c->user, &uid);
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if (r < 0)
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return -ENODATA;
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r = asprintf(&printed, UID_FMT, uid);
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}
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}
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} else {
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_cleanup_free_ char *tmp = NULL;
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const char *username = NULL;
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uid_t uid;
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if (c->user)
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username = c->user;
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else
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/* get USER env from env or our own uid */
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username = tmp = getusername_malloc();
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/* fish username from passwd */
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r = get_user_creds(&username, &uid, NULL, NULL, NULL);
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if (r < 0)
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return r;
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if (specifier == 'u')
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printed = strdup(username);
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else
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r = asprintf(&printed, UID_FMT, uid);
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}
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if (r < 0 || !printed)
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return -ENOMEM;
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*ret = printed;
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return 0;
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}
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static int specifier_user_home(char specifier, void *data, void *userdata, char **ret) {
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Unit *u = userdata;
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ExecContext *c;
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char *n;
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int r;
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assert(u);
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c = unit_get_exec_context(u);
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if (!c)
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return -EOPNOTSUPP;
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if (u->manager->running_as == MANAGER_SYSTEM) {
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/* We cannot use NSS from PID 1, hence try to make the
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* best of it if we can, but fail if we can't */
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if (!c->user || streq(c->user, "root") || streq(c->user, "0"))
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n = strdup("/root");
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else
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return -EOPNOTSUPP;
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} else {
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/* return HOME if set, otherwise from passwd */
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if (!c || !c->user) {
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r = get_home_dir(&n);
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if (r < 0)
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return r;
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} else {
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const char *username, *home;
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username = c->user;
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r = get_user_creds(&username, NULL, NULL, &home, NULL);
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if (r < 0)
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return r;
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n = strdup(home);
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}
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}
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if (!n)
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return -ENOMEM;
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*ret = n;
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return 0;
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}
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static int specifier_user_shell(char specifier, void *data, void *userdata, char **ret) {
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Unit *u = userdata;
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ExecContext *c;
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char *n;
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int r;
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assert(u);
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c = unit_get_exec_context(u);
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if (!c)
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return -EOPNOTSUPP;
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if (u->manager->running_as == MANAGER_SYSTEM) {
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/* We cannot use NSS from PID 1, hence try to make the
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* best of it if we can, but fail if we can't */
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if (!c->user || streq(c->user, "root") || streq(c->user, "0"))
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n = strdup("/bin/sh");
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else
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return -EOPNOTSUPP;
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} else {
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/* return /bin/sh for root, otherwise the value from passwd */
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if (!c->user) {
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r = get_shell(&n);
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if (r < 0)
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return r;
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} else {
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const char *username, *shell;
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username = c->user;
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r = get_user_creds(&username, NULL, NULL, NULL, &shell);
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if (r < 0)
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return r;
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n = strdup(shell);
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}
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}
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if (!n)
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return -ENOMEM;
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*ret = n;
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return 0;
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}
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int unit_name_printf(Unit *u, const char* format, char **ret) {
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/*
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* This will use the passed string as format string and
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* replace the following specifiers:
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*
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* %n: the full id of the unit (foo@bar.waldo)
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* %N: the id of the unit without the suffix (foo@bar)
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* %p: the prefix (foo)
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* %i: the instance (bar)
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*/
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const Specifier table[] = {
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{ 'n', specifier_string, u->id },
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{ 'N', specifier_prefix_and_instance, NULL },
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{ 'p', specifier_prefix, NULL },
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{ 'i', specifier_string, u->instance },
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{ 0, NULL, NULL }
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};
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assert(u);
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assert(format);
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assert(ret);
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return specifier_printf(format, table, u, ret);
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}
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int unit_full_printf(Unit *u, const char *format, char **ret) {
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/* This is similar to unit_name_printf() but also supports
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* unescaping. Also, adds a couple of additional codes:
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*
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* %f the instance if set, otherwise the id
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* %c cgroup path of unit
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* %r where units in this slice are placed in the cgroup tree
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* %R the root of this systemd's instance tree
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* %t the runtime directory to place sockets in (e.g. "/run" or $XDG_RUNTIME_DIR)
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* %U the UID of the configured user or running user
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* %u the username of the configured user or running user
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* %h the homedir of the configured user or running user
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* %s the shell of the configured user or running user
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* %m the machine ID of the running system
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* %H the host name of the running system
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* %b the boot ID of the running system
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* %v `uname -r` of the running system
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*/
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const Specifier table[] = {
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{ 'n', specifier_string, u->id },
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{ 'N', specifier_prefix_and_instance, NULL },
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{ 'p', specifier_prefix, NULL },
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{ 'P', specifier_prefix_unescaped, NULL },
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{ 'i', specifier_string, u->instance },
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{ 'I', specifier_instance_unescaped, NULL },
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{ 'f', specifier_filename, NULL },
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{ 'c', specifier_cgroup, NULL },
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{ 'r', specifier_cgroup_slice, NULL },
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{ 'R', specifier_cgroup_root, NULL },
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{ 't', specifier_runtime, NULL },
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{ 'U', specifier_user_name, NULL },
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{ 'u', specifier_user_name, NULL },
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{ 'h', specifier_user_home, NULL },
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{ 's', specifier_user_shell, NULL },
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{ 'm', specifier_machine_id, NULL },
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{ 'H', specifier_host_name, NULL },
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{ 'b', specifier_boot_id, NULL },
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{ 'v', specifier_kernel_release, NULL },
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{}
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};
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assert(u);
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assert(format);
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assert(ret);
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return specifier_printf(format, table, u, ret);
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}
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int unit_full_printf_strv(Unit *u, char **l, char ***ret) {
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size_t n;
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char **r, **i, **j;
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int q;
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/* Applies unit_full_printf to every entry in l */
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assert(u);
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n = strv_length(l);
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r = new(char*, n+1);
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if (!r)
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return -ENOMEM;
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for (i = l, j = r; *i; i++, j++) {
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q = unit_full_printf(u, *i, j);
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if (q < 0)
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goto fail;
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}
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*j = NULL;
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*ret = r;
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return 0;
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fail:
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for (j--; j >= r; j--)
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free(*j);
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free(r);
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return q;
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}
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