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