+++ /dev/null
-/*-*- 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 <errno.h>
-#include <string.h>
-
-#include "path-util.h"
-#include "bus-label.h"
-#include "util.h"
-#include "unit-name.h"
-#include "def.h"
-#include "strv.h"
-
-#define VALID_CHARS \
- DIGITS LETTERS \
- ":-_.\\"
-
-bool unit_name_is_valid(const char *n, UnitNameFlags flags) {
- const char *e, *i, *at;
-
- assert((flags & ~(UNIT_NAME_PLAIN|UNIT_NAME_INSTANCE|UNIT_NAME_TEMPLATE)) == 0);
-
- if (_unlikely_(flags == 0))
- return false;
-
- if (isempty(n))
- return false;
-
- if (strlen(n) >= UNIT_NAME_MAX)
- return false;
-
- e = strrchr(n, '.');
- if (!e || e == n)
- return false;
-
- if (unit_type_from_string(e + 1) < 0)
- return false;
-
- for (i = n, at = NULL; i < e; i++) {
-
- if (*i == '@' && !at)
- at = i;
-
- if (!strchr("@" VALID_CHARS, *i))
- return false;
- }
-
- if (at == n)
- return false;
-
- if (flags & UNIT_NAME_PLAIN)
- if (!at)
- return true;
-
- if (flags & UNIT_NAME_INSTANCE)
- if (at && e > at + 1)
- return true;
-
- if (flags & UNIT_NAME_TEMPLATE)
- if (at && e == at + 1)
- return true;
-
- return false;
-}
-
-bool unit_prefix_is_valid(const char *p) {
-
- /* We don't allow additional @ in the prefix string */
-
- if (isempty(p))
- return false;
-
- return in_charset(p, VALID_CHARS);
-}
-
-bool unit_instance_is_valid(const char *i) {
-
- /* The max length depends on the length of the string, so we
- * don't really check this here. */
-
- if (isempty(i))
- return false;
-
- /* We allow additional @ in the instance string, we do not
- * allow them in the prefix! */
-
- return in_charset(i, "@" VALID_CHARS);
-}
-
-bool unit_suffix_is_valid(const char *s) {
- if (isempty(s))
- return false;
-
- if (s[0] != '.')
- return false;
-
- if (unit_type_from_string(s + 1) < 0)
- return false;
-
- return true;
-}
-
-int unit_name_to_prefix(const char *n, char **ret) {
- const char *p;
- char *s;
-
- assert(n);
- assert(ret);
-
- if (!unit_name_is_valid(n, UNIT_NAME_ANY))
- return -EINVAL;
-
- p = strchr(n, '@');
- if (!p)
- p = strrchr(n, '.');
-
- assert_se(p);
-
- s = strndup(n, p - n);
- if (!s)
- return -ENOMEM;
-
- *ret = s;
- return 0;
-}
-
-int unit_name_to_instance(const char *n, char **instance) {
- const char *p, *d;
- char *i;
-
- assert(n);
- assert(instance);
-
- if (!unit_name_is_valid(n, UNIT_NAME_ANY))
- return -EINVAL;
-
- /* Everything past the first @ and before the last . is the instance */
- p = strchr(n, '@');
- if (!p) {
- *instance = NULL;
- return 0;
- }
-
- p++;
-
- d = strrchr(p, '.');
- if (!d)
- return -EINVAL;
-
- i = strndup(p, d-p);
- if (!i)
- return -ENOMEM;
-
- *instance = i;
- return 1;
-}
-
-int unit_name_to_prefix_and_instance(const char *n, char **ret) {
- const char *d;
- char *s;
-
- assert(n);
- assert(ret);
-
- if (!unit_name_is_valid(n, UNIT_NAME_ANY))
- return -EINVAL;
-
- d = strrchr(n, '.');
- if (!d)
- return -EINVAL;
-
- s = strndup(n, d - n);
- if (!s)
- return -ENOMEM;
-
- *ret = s;
- return 0;
-}
-
-UnitType unit_name_to_type(const char *n) {
- const char *e;
-
- assert(n);
-
- if (!unit_name_is_valid(n, UNIT_NAME_ANY))
- return _UNIT_TYPE_INVALID;
-
- assert_se(e = strrchr(n, '.'));
-
- return unit_type_from_string(e + 1);
-}
-
-int unit_name_change_suffix(const char *n, const char *suffix, char **ret) {
- char *e, *s;
- size_t a, b;
-
- assert(n);
- assert(suffix);
- assert(ret);
-
- if (!unit_name_is_valid(n, UNIT_NAME_ANY))
- return -EINVAL;
-
- if (!unit_suffix_is_valid(suffix))
- return -EINVAL;
-
- assert_se(e = strrchr(n, '.'));
-
- a = e - n;
- b = strlen(suffix);
-
- s = new(char, a + b + 1);
- if (!s)
- return -ENOMEM;
-
- strcpy(mempcpy(s, n, a), suffix);
- *ret = s;
-
- return 0;
-}
-
-int unit_name_build(const char *prefix, const char *instance, const char *suffix, char **ret) {
- char *s;
-
- assert(prefix);
- assert(suffix);
- assert(ret);
-
- if (!unit_prefix_is_valid(prefix))
- return -EINVAL;
-
- if (instance && !unit_instance_is_valid(instance))
- return -EINVAL;
-
- if (!unit_suffix_is_valid(suffix))
- return -EINVAL;
-
- if (!instance)
- s = strappend(prefix, suffix);
- else
- s = strjoin(prefix, "@", instance, suffix, NULL);
- if (!s)
- return -ENOMEM;
-
- *ret = s;
- return 0;
-}
-
-static char *do_escape_char(char c, char *t) {
- assert(t);
-
- *(t++) = '\\';
- *(t++) = 'x';
- *(t++) = hexchar(c >> 4);
- *(t++) = hexchar(c);
-
- return t;
-}
-
-static char *do_escape(const char *f, char *t) {
- assert(f);
- assert(t);
-
- /* do not create units with a leading '.', like for "/.dotdir" mount points */
- if (*f == '.') {
- t = do_escape_char(*f, t);
- f++;
- }
-
- for (; *f; f++) {
- if (*f == '/')
- *(t++) = '-';
- else if (*f == '-' || *f == '\\' || !strchr(VALID_CHARS, *f))
- t = do_escape_char(*f, t);
- else
- *(t++) = *f;
- }
-
- return t;
-}
-
-char *unit_name_escape(const char *f) {
- char *r, *t;
-
- assert(f);
-
- r = new(char, strlen(f)*4+1);
- if (!r)
- return NULL;
-
- t = do_escape(f, r);
- *t = 0;
-
- return r;
-}
-
-int unit_name_unescape(const char *f, char **ret) {
- _cleanup_free_ char *r = NULL;
- char *t;
-
- assert(f);
-
- r = strdup(f);
- if (!r)
- return -ENOMEM;
-
- for (t = r; *f; f++) {
- if (*f == '-')
- *(t++) = '/';
- else if (*f == '\\') {
- int a, b;
-
- if (f[1] != 'x')
- return -EINVAL;
-
- a = unhexchar(f[2]);
- if (a < 0)
- return -EINVAL;
-
- b = unhexchar(f[3]);
- if (b < 0)
- return -EINVAL;
-
- *(t++) = (char) (((uint8_t) a << 4U) | (uint8_t) b);
- f += 3;
- } else
- *(t++) = *f;
- }
-
- *t = 0;
-
- *ret = r;
- r = NULL;
-
- return 0;
-}
-
-int unit_name_path_escape(const char *f, char **ret) {
- char *p, *s;
-
- assert(f);
- assert(ret);
-
- p = strdupa(f);
- if (!p)
- return -ENOMEM;
-
- path_kill_slashes(p);
-
- if (STR_IN_SET(p, "/", ""))
- s = strdup("-");
- else {
- char *e;
-
- if (!path_is_safe(p))
- return -EINVAL;
-
- /* Truncate trailing slashes */
- e = endswith(p, "/");
- if (e)
- *e = 0;
-
- /* Truncate leading slashes */
- if (p[0] == '/')
- p++;
-
- s = unit_name_escape(p);
- }
- if (!s)
- return -ENOMEM;
-
- *ret = s;
- return 0;
-}
-
-int unit_name_path_unescape(const char *f, char **ret) {
- char *s;
- int r;
-
- assert(f);
-
- if (isempty(f))
- return -EINVAL;
-
- if (streq(f, "-")) {
- s = strdup("/");
- if (!s)
- return -ENOMEM;
- } else {
- char *w;
-
- r = unit_name_unescape(f, &w);
- if (r < 0)
- return r;
-
- /* Don't accept trailing or leading slashes */
- if (startswith(w, "/") || endswith(w, "/")) {
- free(w);
- return -EINVAL;
- }
-
- /* Prefix a slash again */
- s = strappend("/", w);
- free(w);
- if (!s)
- return -ENOMEM;
-
- if (!path_is_safe(s)) {
- free(s);
- return -EINVAL;
- }
- }
-
- if (ret)
- *ret = s;
- else
- free(s);
-
- return 0;
-}
-
-int unit_name_replace_instance(const char *f, const char *i, char **ret) {
- const char *p, *e;
- char *s;
- size_t a, b;
-
- assert(f);
- assert(i);
- assert(ret);
-
- if (!unit_name_is_valid(f, UNIT_NAME_INSTANCE|UNIT_NAME_TEMPLATE))
- return -EINVAL;
- if (!unit_instance_is_valid(i))
- return -EINVAL;
-
- assert_se(p = strchr(f, '@'));
- assert_se(e = strrchr(f, '.'));
-
- a = p - f;
- b = strlen(i);
-
- s = new(char, a + 1 + b + strlen(e) + 1);
- if (!s)
- return -ENOMEM;
-
- strcpy(mempcpy(mempcpy(s, f, a + 1), i, b), e);
-
- *ret = s;
- return 0;
-}
-
-int unit_name_template(const char *f, char **ret) {
- const char *p, *e;
- char *s;
- size_t a;
-
- assert(f);
- assert(ret);
-
- if (!unit_name_is_valid(f, UNIT_NAME_INSTANCE|UNIT_NAME_TEMPLATE))
- return -EINVAL;
-
- assert_se(p = strchr(f, '@'));
- assert_se(e = strrchr(f, '.'));
-
- a = p - f;
-
- s = new(char, a + 1 + strlen(e) + 1);
- if (!s)
- return -ENOMEM;
-
- strcpy(mempcpy(s, f, a + 1), e);
-
- *ret = s;
- return 0;
-}
-
-int unit_name_from_path(const char *path, const char *suffix, char **ret) {
- _cleanup_free_ char *p = NULL;
- char *s = NULL;
- int r;
-
- assert(path);
- assert(suffix);
- assert(ret);
-
- if (!unit_suffix_is_valid(suffix))
- return -EINVAL;
-
- r = unit_name_path_escape(path, &p);
- if (r < 0)
- return r;
-
- s = strappend(p, suffix);
- if (!s)
- return -ENOMEM;
-
- *ret = s;
- return 0;
-}
-
-int unit_name_from_path_instance(const char *prefix, const char *path, const char *suffix, char **ret) {
- _cleanup_free_ char *p = NULL;
- char *s;
- int r;
-
- assert(prefix);
- assert(path);
- assert(suffix);
- assert(ret);
-
- if (!unit_prefix_is_valid(prefix))
- return -EINVAL;
-
- if (!unit_suffix_is_valid(suffix))
- return -EINVAL;
-
- r = unit_name_path_escape(path, &p);
- if (r < 0)
- return r;
-
- s = strjoin(prefix, "@", p, suffix, NULL);
- if (!s)
- return -ENOMEM;
-
- *ret = s;
- return 0;
-}
-
-int unit_name_to_path(const char *name, char **ret) {
- _cleanup_free_ char *prefix = NULL;
- int r;
-
- assert(name);
-
- r = unit_name_to_prefix(name, &prefix);
- if (r < 0)
- return r;
-
- return unit_name_path_unescape(prefix, ret);
-}
-
-char *unit_dbus_path_from_name(const char *name) {
- _cleanup_free_ char *e = NULL;
-
- assert(name);
-
- e = bus_label_escape(name);
- if (!e)
- return NULL;
-
- return strappend("/org/freedesktop/systemd1/unit/", e);
-}
-
-int unit_name_from_dbus_path(const char *path, char **name) {
- const char *e;
- char *n;
-
- e = startswith(path, "/org/freedesktop/systemd1/unit/");
- if (!e)
- return -EINVAL;
-
- n = bus_label_unescape(e);
- if (!n)
- return -ENOMEM;
-
- *name = n;
- return 0;
-}
-
-static char *do_escape_mangle(const char *f, UnitNameMangle allow_globs, char *t) {
- const char *valid_chars;
-
- assert(f);
- assert(IN_SET(allow_globs, UNIT_NAME_GLOB, UNIT_NAME_NOGLOB));
- assert(t);
-
- /* We'll only escape the obvious characters here, to play
- * safe. */
-
- valid_chars = allow_globs == UNIT_NAME_GLOB ? "@" VALID_CHARS "[]!-*?" : "@" VALID_CHARS;
-
- for (; *f; f++) {
- if (*f == '/')
- *(t++) = '-';
- else if (!strchr(valid_chars, *f))
- t = do_escape_char(*f, t);
- else
- *(t++) = *f;
- }
-
- return t;
-}
-
-/**
- * Convert a string to a unit name. /dev/blah is converted to dev-blah.device,
- * /blah/blah is converted to blah-blah.mount, anything else is left alone,
- * except that @suffix is appended if a valid unit suffix is not present.
- *
- * If @allow_globs, globs characters are preserved. Otherwise they are escaped.
- */
-int unit_name_mangle_with_suffix(const char *name, UnitNameMangle allow_globs, const char *suffix, char **ret) {
- char *s, *t;
- int r;
-
- assert(name);
- assert(suffix);
- assert(ret);
-
- if (isempty(name)) /* We cannot mangle empty unit names to become valid, sorry. */
- return -EINVAL;
-
- if (!unit_suffix_is_valid(suffix))
- return -EINVAL;
-
- if (unit_name_is_valid(name, UNIT_NAME_ANY)) {
- /* No mangling necessary... */
- s = strdup(name);
- if (!s)
- return -ENOMEM;
-
- *ret = s;
- return 0;
- }
-
- if (is_device_path(name)) {
- r = unit_name_from_path(name, ".device", ret);
- if (r >= 0)
- return 1;
- if (r != -EINVAL)
- return r;
- }
-
- if (path_is_absolute(name)) {
- r = unit_name_from_path(name, ".mount", ret);
- if (r >= 0)
- return 1;
- if (r != -EINVAL)
- return r;
- }
-
- s = new(char, strlen(name) * 4 + strlen(suffix) + 1);
- if (!s)
- return -ENOMEM;
-
- t = do_escape_mangle(name, allow_globs, s);
- *t = 0;
-
- if (unit_name_to_type(s) < 0)
- strcpy(t, suffix);
-
- *ret = s;
- return 1;
-}
-
-int slice_build_parent_slice(const char *slice, char **ret) {
- char *s, *dash;
-
- assert(slice);
- assert(ret);
-
- if (!slice_name_is_valid(slice))
- return -EINVAL;
-
- if (streq(slice, "-.slice")) {
- *ret = NULL;
- return 0;
- }
-
- s = strdup(slice);
- if (!s)
- return -ENOMEM;
-
- dash = strrchr(s, '-');
- if (dash)
- strcpy(dash, ".slice");
- else {
- free(s);
-
- s = strdup("-.slice");
- if (!s)
- return -ENOMEM;
- }
-
- *ret = s;
- return 1;
-}
-
-int slice_build_subslice(const char *slice, const char*name, char **ret) {
- char *subslice;
-
- assert(slice);
- assert(name);
- assert(ret);
-
- if (!slice_name_is_valid(slice))
- return -EINVAL;
-
- if (!unit_prefix_is_valid(name))
- return -EINVAL;
-
- if (streq(slice, "-.slice"))
- subslice = strappend(name, ".slice");
- else {
- char *e;
-
- assert_se(e = endswith(slice, ".slice"));
-
- subslice = new(char, (e - slice) + 1 + strlen(name) + 6 + 1);
- if (!subslice)
- return -ENOMEM;
-
- stpcpy(stpcpy(stpcpy(mempcpy(subslice, slice, e - slice), "-"), name), ".slice");
- }
-
- *ret = subslice;
- return 0;
-}
-
-bool slice_name_is_valid(const char *name) {
- const char *p, *e;
- bool dash = false;
-
- if (!unit_name_is_valid(name, UNIT_NAME_PLAIN))
- return false;
-
- if (streq(name, "-.slice"))
- return true;
-
- e = endswith(name, ".slice");
- if (!e)
- return false;
-
- for (p = name; p < e; p++) {
-
- if (*p == '-') {
-
- /* Don't allow initial dash */
- if (p == name)
- return false;
-
- /* Don't allow multiple dashes */
- if (dash)
- return false;
-
- dash = true;
- } else
- dash = false;
- }
-
- /* Don't allow trailing hash */
- if (dash)
- return false;
-
- return true;
-}
-
-static const char* const unit_type_table[_UNIT_TYPE_MAX] = {
- [UNIT_SERVICE] = "service",
- [UNIT_SOCKET] = "socket",
- [UNIT_BUSNAME] = "busname",
- [UNIT_TARGET] = "target",
- [UNIT_SNAPSHOT] = "snapshot",
- [UNIT_DEVICE] = "device",
- [UNIT_MOUNT] = "mount",
- [UNIT_AUTOMOUNT] = "automount",
- [UNIT_SWAP] = "swap",
- [UNIT_TIMER] = "timer",
- [UNIT_PATH] = "path",
- [UNIT_SLICE] = "slice",
- [UNIT_SCOPE] = "scope"
-};
-
-DEFINE_STRING_TABLE_LOOKUP(unit_type, UnitType);
-
-static const char* const unit_load_state_table[_UNIT_LOAD_STATE_MAX] = {
- [UNIT_STUB] = "stub",
- [UNIT_LOADED] = "loaded",
- [UNIT_NOT_FOUND] = "not-found",
- [UNIT_ERROR] = "error",
- [UNIT_MERGED] = "merged",
- [UNIT_MASKED] = "masked"
-};
-
-DEFINE_STRING_TABLE_LOOKUP(unit_load_state, UnitLoadState);
-
-static const char* const unit_dependency_table[_UNIT_DEPENDENCY_MAX] = {
- [UNIT_REQUIRES] = "Requires",
- [UNIT_REQUIRES_OVERRIDABLE] = "RequiresOverridable",
- [UNIT_REQUISITE] = "Requisite",
- [UNIT_REQUISITE_OVERRIDABLE] = "RequisiteOverridable",
- [UNIT_WANTS] = "Wants",
- [UNIT_BINDS_TO] = "BindsTo",
- [UNIT_PART_OF] = "PartOf",
- [UNIT_REQUIRED_BY] = "RequiredBy",
- [UNIT_REQUIRED_BY_OVERRIDABLE] = "RequiredByOverridable",
- [UNIT_REQUISITE_OF] = "RequisiteOf",
- [UNIT_REQUISITE_OF_OVERRIDABLE] = "RequisiteOfOverridable",
- [UNIT_WANTED_BY] = "WantedBy",
- [UNIT_BOUND_BY] = "BoundBy",
- [UNIT_CONSISTS_OF] = "ConsistsOf",
- [UNIT_CONFLICTS] = "Conflicts",
- [UNIT_CONFLICTED_BY] = "ConflictedBy",
- [UNIT_BEFORE] = "Before",
- [UNIT_AFTER] = "After",
- [UNIT_ON_FAILURE] = "OnFailure",
- [UNIT_TRIGGERS] = "Triggers",
- [UNIT_TRIGGERED_BY] = "TriggeredBy",
- [UNIT_PROPAGATES_RELOAD_TO] = "PropagatesReloadTo",
- [UNIT_RELOAD_PROPAGATED_FROM] = "ReloadPropagatedFrom",
- [UNIT_JOINS_NAMESPACE_OF] = "JoinsNamespaceOf",
- [UNIT_REFERENCES] = "References",
- [UNIT_REFERENCED_BY] = "ReferencedBy",
-};
-
-DEFINE_STRING_TABLE_LOOKUP(unit_dependency, UnitDependency);
~ianmdlvl / elogind.git / blobdiff