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-rw-r--r--unit-name.c373
1 files changed, 373 insertions, 0 deletions
diff --git a/unit-name.c b/unit-name.c
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index 0000000000..219997b681
--- /dev/null
+++ b/unit-name.c
@@ -0,0 +1,373 @@
+/*-*- Mode: C; c-basic-offset: 8 -*-*/
+
+/***
+ 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 General Public License as published by
+ the Free Software Foundation; either version 2 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
+ General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <errno.h>
+#include <string.h>
+
+#include "unit.h"
+#include "unit-name.h"
+
+#define VALID_CHARS \
+ "0123456789" \
+ "abcdefghijklmnopqrstuvwxyz" \
+ "ABCDEFGHIJKLMNOPQRSTUVWXYZ" \
+ "-_.\\"
+
+UnitType unit_name_to_type(const char *n) {
+ UnitType t;
+
+ assert(n);
+
+ for (t = 0; t < _UNIT_TYPE_MAX; t++)
+ if (endswith(n, unit_vtable[t]->suffix))
+ return t;
+
+ return _UNIT_TYPE_INVALID;
+}
+
+bool unit_name_is_valid(const char *n) {
+ UnitType t;
+ const char *e, *i, *at;
+
+ /* Valid formats:
+ *
+ * string@instance.suffix
+ * string.suffix
+ */
+
+ assert(n);
+
+ if (strlen(n) >= UNIT_NAME_MAX)
+ return false;
+
+ t = unit_name_to_type(n);
+ if (t < 0 || t >= _UNIT_TYPE_MAX)
+ return false;
+
+ assert_se(e = strrchr(n, '.'));
+
+ if (e == n)
+ return false;
+
+ for (i = n, at = NULL; i < e; i++) {
+
+ if (*i == '@' && !at)
+ at = i;
+
+ if (!strchr("@" VALID_CHARS, *i))
+ return false;
+ }
+
+ if (at) {
+ if (at == n)
+ return false;
+
+ if (at[1] == '.')
+ return false;
+ }
+
+ return true;
+}
+
+bool unit_instance_is_valid(const char *i) {
+ assert(i);
+
+ /* The max length depends on the length of the string, so we
+ * don't really check this here. */
+
+ if (i[0] == 0)
+ return false;
+
+ /* We allow additional @ in the instance string, we do not
+ * allow them in the prefix! */
+
+ for (; *i; i++)
+ if (!strchr("@" VALID_CHARS, *i))
+ return false;
+
+ return true;
+}
+
+bool unit_prefix_is_valid(const char *p) {
+
+ /* We don't allow additional @ in the instance string */
+
+ if (p[0] == 0)
+ return false;
+
+ for (; *p; p++)
+ if (!strchr(VALID_CHARS, *p))
+ return false;
+
+ return true;
+}
+
+int unit_name_to_instance(const char *n, char **instance) {
+ const char *p, *d;
+ char *i;
+
+ assert(n);
+ assert(instance);
+
+ /* Everything past the first @ and before the last . is the instance */
+ if (!(p = strchr(n, '@'))) {
+ *instance = NULL;
+ return 0;
+ }
+
+ assert_se(d = strrchr(n, '.'));
+ assert(p < d);
+
+ if (!(i = strndup(p+1, d-p-1)))
+ return -ENOMEM;
+
+ *instance = i;
+ return 0;
+}
+
+char *unit_name_to_prefix_and_instance(const char *n) {
+ const char *d;
+
+ assert(n);
+
+ assert_se(d = strrchr(n, '.'));
+
+ return strndup(n, d - n);
+}
+
+char *unit_name_to_prefix(const char *n) {
+ const char *p;
+
+ if ((p = strchr(n, '@')))
+ return strndup(n, p - n);
+
+ return unit_name_to_prefix_and_instance(n);
+}
+
+char *unit_name_change_suffix(const char *n, const char *suffix) {
+ char *e, *r;
+ size_t a, b;
+
+ assert(n);
+ assert(unit_name_is_valid(n));
+ assert(suffix);
+
+ assert_se(e = strrchr(n, '.'));
+ a = e - n;
+ b = strlen(suffix);
+
+ if (!(r = new(char, a + b + 1)))
+ return NULL;
+
+ memcpy(r, n, a);
+ memcpy(r+a, suffix, b+1);
+
+ return r;
+}
+
+char *unit_name_build(const char *prefix, const char *instance, const char *suffix) {
+ char *r;
+
+ assert(prefix);
+ assert(unit_prefix_is_valid(prefix));
+ assert(!instance || unit_instance_is_valid(instance));
+ assert(suffix);
+ assert(unit_name_to_type(suffix) >= 0);
+
+ if (!instance)
+ return strappend(prefix, suffix);
+
+ if (asprintf(&r, "%s@%s%s", prefix, instance, suffix) < 0)
+ return NULL;
+
+ return r;
+}
+
+static char* do_escape(const char *f, char *t) {
+ assert(f);
+ assert(t);
+
+ for (; *f; f++) {
+ if (*f == '/')
+ *(t++) = '.';
+ else if (*f == '.' || *f == '\\' || !strchr(VALID_CHARS, *f)) {
+ *(t++) = '\\';
+ *(t++) = 'x';
+ *(t++) = hexchar(*f > 4);
+ *(t++) = hexchar(*f);
+ } else
+ *(t++) = *f;
+ }
+
+ return t;
+}
+
+char *unit_name_build_escape(const char *prefix, const char *instance, const char *suffix) {
+ char *r, *t;
+ size_t a, b, c;
+
+ assert(prefix);
+ assert(suffix);
+ assert(unit_name_to_type(suffix) >= 0);
+
+ /* Takes a arbitrary string for prefix and instance plus a
+ * suffix and makes a nice string suitable as unit name of it,
+ * escaping all weird chars on the way.
+ *
+ * / becomes ., and all chars not alloweed in a unit name get
+ * escaped as \xFF, including \ and ., of course. This
+ * escaping is hence reversible.
+ *
+ * This is primarily useful to make nice unit names from
+ * strings, but is actually useful for any kind of string.
+ */
+
+ a = strlen(prefix);
+ c = strlen(suffix);
+
+ if (instance) {
+ b = strlen(instance);
+
+ if (!(r = new(char, a*4 + 1 + b*4 + c + 1)))
+ return NULL;
+
+ t = do_escape(prefix, r);
+ *(t++) = '@';
+ t = do_escape(instance, t);
+ } else {
+
+ if (!(r = new(char, a*4 + c + 1)))
+ return NULL;
+
+ t = do_escape(prefix, r);
+ }
+
+ strcpy(t, suffix);
+ return r;
+}
+
+char *unit_name_escape(const char *f) {
+ char *r, *t;
+
+ if (!(r = new(char, strlen(f)*4+1)))
+ return NULL;
+
+ t = do_escape(f, r);
+ *t = 0;
+
+ return r;
+
+}
+
+char *unit_name_unescape(const char *f) {
+ char *r, *t;
+
+ assert(f);
+
+ if (!(r = strdup(f)))
+ return NULL;
+
+ for (t = r; *f; f++) {
+ if (*f == '.')
+ *(t++) = '/';
+ else if (*f == '\\') {
+ int a, b;
+
+ if ((a = unhexchar(f[1])) < 0 ||
+ (b = unhexchar(f[2])) < 0) {
+ /* Invalid escape code, let's take it literal then */
+ *(t++) = '\\';
+ } else {
+ *(t++) = (char) ((a << 4) | b);
+ f += 2;
+ }
+ } else
+ *(t++) = *f;
+ }
+
+ *t = 0;
+
+ return r;
+}
+
+bool unit_name_is_template(const char *n) {
+ const char *p;
+
+ assert(n);
+
+ if (!(p = strchr(n, '@')))
+ return false;
+
+ return p[1] == '.';
+}
+
+char *unit_name_replace_instance(const char *f, const char *i) {
+ const char *p, *e;
+ char *r, *k;
+ size_t a;
+
+ assert(f);
+
+ p = strchr(f, '@');
+ assert_se(e = strrchr(f, '.'));
+
+ a = p - f;
+
+ if (p) {
+ size_t b;
+
+ b = strlen(i);
+
+ if (!(r = new(char, a + 1 + b + strlen(e) + 1)))
+ return NULL;
+
+ k = mempcpy(r, f, a + 1);
+ k = mempcpy(k, i, b);
+ } else {
+
+ if (!(r = new(char, a + strlen(e) + 1)))
+ return NULL;
+
+ k = mempcpy(r, f, a);
+ }
+
+ strcpy(k, e);
+ return r;
+}
+
+char *unit_name_template(const char *f) {
+ const char *p, *e;
+ char *r;
+ size_t a;
+
+ if (!(p = strchr(f, '@')))
+ return strdup(f);
+
+ assert_se(e = strrchr(f, '.'));
+ a = p - f + 1;
+
+ if (!(r = new(char, a + strlen(e) + 1)))
+ return NULL;
+
+ strcpy(mempcpy(r, f, a), e);
+ return r;
+
+}
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