/*-*- 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 "systemd/sd-id128.h" #include "unit.h" #include "specifier.h" #include "path-util.h" #include "strv.h" #include "unit-name.h" #include "unit-printf.h" #include "macro.h" #include "cgroup-util.h" #include "special.h" static int specifier_prefix_and_instance(char specifier, void *data, void *userdata, char **ret) { Unit *u = userdata; char *n; assert(u); n = unit_name_to_prefix_and_instance(u->id); if (!n) return -ENOMEM; *ret = n; return 0; } static int specifier_prefix(char specifier, void *data, void *userdata, char **ret) { Unit *u = userdata; char *n; assert(u); n = unit_name_to_prefix(u->id); if (!n) return -ENOMEM; *ret = n; return 0; } static int specifier_prefix_unescaped(char specifier, void *data, void *userdata, char **ret) { Unit *u = userdata; _cleanup_free_ char *p = NULL; char *n; assert(u); p = unit_name_to_prefix(u->id); if (!p) return -ENOMEM; n = unit_name_unescape(p); if (!n) return -ENOMEM; *ret = n; return 0; } static int specifier_instance_unescaped(char specifier, void *data, void *userdata, char **ret) { Unit *u = userdata; char *n; assert(u); if (!u->instance) return -ENOTSUP; n = unit_name_unescape(u->instance); if (!n) return -ENOMEM; *ret = n; return 0; } static int specifier_filename(char specifier, void *data, void *userdata, char **ret) { Unit *u = userdata; char *n; assert(u); if (u->instance) n = unit_name_path_unescape(u->instance); else n = unit_name_to_path(u->id); if (!n) return -ENOMEM; *ret = n; return 0; } 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; const char *slice; char *n; int r; assert(u); slice = unit_slice_name(u); if (specifier == 'R' || !slice) n = strdup(u->manager->cgroup_root); else { _cleanup_free_ char *p = NULL; r = cg_slice_to_path(slice, &p); if (r < 0) return r; n = strjoin(u->manager->cgroup_root, "/", p, NULL); 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 == SYSTEMD_SYSTEM) e = "/run"; else { e = getenv("XDG_RUNTIME_DIR"); if (!e) return -ENOTSUP; } 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 *printed = NULL; Unit *u = userdata; ExecContext *c; int r; assert(u); c = unit_get_exec_context(u); if (!c) return -ENOTSUP; if (u->manager->running_as == SYSTEMD_SYSTEM) { /* We cannot use NSS from PID 1, hence try to make the * best of it in that case, and fail if we can't help * it */ if (!c->user || streq(c->user, "root") || streq(c->user, "0")) printed = strdup(specifier == 'u' ? "root" : "0"); else { if (specifier == 'u') printed = strdup(c->user); else { uid_t uid; r = parse_uid(c->user, &uid); if (r < 0) return -ENODATA; asprintf(&printed, UID_FMT, uid); } } } else { _cleanup_free_ char *tmp = NULL; const char *username = NULL; uid_t uid; if (c->user) username = c->user; else /* get USER env from env or our own uid */ username = tmp = getusername_malloc(); /* fish username from passwd */ r = get_user_creds(&username, &uid, NULL, NULL, NULL); if (r < 0) return r; if (specifier == 'u') printed = strdup(username); else asprintf(&printed, UID_FMT, uid); } if (!printed) return -ENOMEM; *ret = printed; return 0; } static int specifier_user_home(char specifier, void *data, void *userdata, char **ret) { Unit *u = userdata; ExecContext *c; char *n; int r; assert(u); c = unit_get_exec_context(u); if (!c) return -ENOTSUP; if (u->manager->running_as == SYSTEMD_SYSTEM) { /* We cannot use NSS from PID 1, hence try to make the * best of it if we can, but fail if we can't */ if (!c->user || streq(c->user, "root") || streq(c->user, "0")) n = strdup("/root"); else return -ENOTSUP; } else { /* return HOME if set, otherwise from passwd */ if (!c || !c->user) { r = get_home_dir(&n); if (r < 0) return r; } else { const char *username, *home; username = c->user; r = get_user_creds(&username, NULL, NULL, &home, NULL); if (r < 0) return r; n = strdup(home); } } if (!n) return -ENOMEM; *ret = n; return 0; } static int specifier_user_shell(char specifier, void *data, void *userdata, char **ret) { Unit *u = userdata; ExecContext *c; char *n; int r; assert(u); c = unit_get_exec_context(u); if (!c) return -ENOTSUP; if (u->manager->running_as == SYSTEMD_SYSTEM) { /* We cannot use NSS from PID 1, hence try to make the * best of it if we can, but fail if we can't */ if (!c->user || streq(c->user, "root") || streq(c->user, "0")) n = strdup("/bin/sh"); else return -ENOTSUP; } else { /* return /bin/sh for root, otherwise the value from passwd */ if (!c->user) { r = get_shell(&n); if (r < 0) return r; } else { const char *username, *shell; username = c->user; r = get_user_creds(&username, NULL, NULL, NULL, &shell); if (r < 0) return r; n = strdup(shell); } } if (!n) return -ENOMEM; *ret = n; return 0; } 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 configured user or running user * %u the username of the configured user or running user * %h the homedir of the configured user or running user * %s the shell of the configured user or 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_root, NULL }, { 'R', specifier_cgroup_root, NULL }, { 't', specifier_runtime, NULL }, { 'U', specifier_user_name, 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; }