| /*-*- 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; |
| } |