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-rw-r--r--src/conf-parser.c460
1 files changed, 460 insertions, 0 deletions
diff --git a/src/conf-parser.c b/src/conf-parser.c
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--- /dev/null
+++ b/src/conf-parser.c
@@ -0,0 +1,460 @@
+/*-*- 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 <string.h>
+#include <stdio.h>
+#include <errno.h>
+#include <assert.h>
+#include <stdlib.h>
+
+#include "conf-parser.h"
+#include "util.h"
+#include "macro.h"
+#include "strv.h"
+#include "log.h"
+
+#define COMMENTS "#;\n"
+#define LINE_MAX 4096
+
+/* Run the user supplied parser for an assignment */
+static int next_assignment(
+ const char *filename,
+ unsigned line,
+ const char *section,
+ const ConfigItem *t,
+ const char *lvalue,
+ const char *rvalue,
+ void *userdata) {
+
+ assert(filename);
+ assert(t);
+ assert(lvalue);
+ assert(rvalue);
+
+ for (; t->parse; t++) {
+
+ if (t->lvalue && !streq(lvalue, t->lvalue))
+ continue;
+
+ if (t->section && !section)
+ continue;
+
+ if (t->section && !streq(section, t->section))
+ continue;
+
+ return t->parse(filename, line, section, lvalue, rvalue, t->data, userdata);
+ }
+
+ /* Warn about unknown non-extension fields. */
+ if (!startswith(lvalue, "X-"))
+ log_info("[%s:%u] Unknown lvalue '%s' in section '%s'. Ignoring.", filename, line, lvalue, strna(section));
+
+ return 0;
+}
+
+/* Parse a variable assignment line */
+static int parse_line(const char *filename, unsigned line, char **section, const char* const * sections, const ConfigItem *t, char *l, void *userdata) {
+ char *e;
+
+ l = strstrip(l);
+
+ if (!*l)
+ return 0;
+
+ if (strchr(COMMENTS, *l))
+ return 0;
+
+ if (startswith(l, ".include ")) {
+ char *fn;
+ int r;
+
+ if (!(fn = file_in_same_dir(filename, strstrip(l+9))))
+ return -ENOMEM;
+
+ r = config_parse(fn, NULL, sections, t, userdata);
+ free(fn);
+
+ return r;
+ }
+
+ if (*l == '[') {
+ size_t k;
+ char *n;
+
+ k = strlen(l);
+ assert(k > 0);
+
+ if (l[k-1] != ']') {
+ log_error("[%s:%u] Invalid section header.", filename, line);
+ return -EBADMSG;
+ }
+
+ if (!(n = strndup(l+1, k-2)))
+ return -ENOMEM;
+
+ if (sections && !strv_contains((char**) sections, n)) {
+ log_error("[%s:%u] Unknown section '%s'.", filename, line, n);
+ free(n);
+ return -EBADMSG;
+ }
+
+ free(*section);
+ *section = n;
+
+ return 0;
+ }
+
+ if (!(e = strchr(l, '='))) {
+ log_error("[%s:%u] Missing '='.", filename, line);
+ return -EBADMSG;
+ }
+
+ *e = 0;
+ e++;
+
+ return next_assignment(filename, line, *section, t, strstrip(l), strstrip(e), userdata);
+}
+
+/* Go through the file and parse each line */
+int config_parse(const char *filename, FILE *f, const char* const * sections, const ConfigItem *t, void *userdata) {
+ unsigned line = 0;
+ char *section = NULL;
+ int r;
+ bool ours = false;
+
+ assert(filename);
+ assert(t);
+
+ if (!f) {
+ if (!(f = fopen(filename, "re"))) {
+ r = -errno;
+ log_error("Failed to open configuration file '%s': %s", filename, strerror(-r));
+ goto finish;
+ }
+
+ ours = true;
+ }
+
+ while (!feof(f)) {
+ char l[LINE_MAX];
+
+ if (!fgets(l, sizeof(l), f)) {
+ if (feof(f))
+ break;
+
+ r = -errno;
+ log_error("Failed to read configuration file '%s': %s", filename, strerror(-r));
+ goto finish;
+ }
+
+ if ((r = parse_line(filename, ++line, &section, sections, t, l, userdata)) < 0)
+ goto finish;
+ }
+
+ r = 0;
+
+finish:
+ free(section);
+
+ if (f && ours)
+ fclose(f);
+
+ return r;
+}
+
+int config_parse_int(
+ const char *filename,
+ unsigned line,
+ const char *section,
+ const char *lvalue,
+ const char *rvalue,
+ void *data,
+ void *userdata) {
+
+ int *i = data;
+ int r;
+
+ assert(filename);
+ assert(lvalue);
+ assert(rvalue);
+ assert(data);
+
+ if ((r = safe_atoi(rvalue, i)) < 0) {
+ log_error("[%s:%u] Failed to parse numeric value: %s", filename, line, rvalue);
+ return r;
+ }
+
+ return 0;
+}
+
+int config_parse_unsigned(
+ const char *filename,
+ unsigned line,
+ const char *section,
+ const char *lvalue,
+ const char *rvalue,
+ void *data,
+ void *userdata) {
+
+ unsigned *u = data;
+ int r;
+
+ assert(filename);
+ assert(lvalue);
+ assert(rvalue);
+ assert(data);
+
+ if ((r = safe_atou(rvalue, u)) < 0) {
+ log_error("[%s:%u] Failed to parse numeric value: %s", filename, line, rvalue);
+ return r;
+ }
+
+ return 0;
+}
+
+int config_parse_size(
+ const char *filename,
+ unsigned line,
+ const char *section,
+ const char *lvalue,
+ const char *rvalue,
+ void *data,
+ void *userdata) {
+
+ size_t *sz = data;
+ unsigned u;
+ int r;
+
+ assert(filename);
+ assert(lvalue);
+ assert(rvalue);
+ assert(data);
+
+ if ((r = safe_atou(rvalue, &u)) < 0) {
+ log_error("[%s:%u] Failed to parse numeric value: %s", filename, line, rvalue);
+ return r;
+ }
+
+ *sz = (size_t) u;
+ return 0;
+}
+
+int config_parse_bool(
+ const char *filename,
+ unsigned line,
+ const char *section,
+ const char *lvalue,
+ const char *rvalue,
+ void *data,
+ void *userdata) {
+
+ int k;
+ bool *b = data;
+
+ assert(filename);
+ assert(lvalue);
+ assert(rvalue);
+ assert(data);
+
+ if ((k = parse_boolean(rvalue)) < 0) {
+ log_error("[%s:%u] Failed to parse boolean value: %s", filename, line, rvalue);
+ return k;
+ }
+
+ *b = !!k;
+ return 0;
+}
+
+int config_parse_string(
+ const char *filename,
+ unsigned line,
+ const char *section,
+ const char *lvalue,
+ const char *rvalue,
+ void *data,
+ void *userdata) {
+
+ char **s = data;
+ char *n;
+
+ assert(filename);
+ assert(lvalue);
+ assert(rvalue);
+ assert(data);
+
+ if (*rvalue) {
+ if (!(n = strdup(rvalue)))
+ return -ENOMEM;
+ } else
+ n = NULL;
+
+ free(*s);
+ *s = n;
+
+ return 0;
+}
+
+int config_parse_path(
+ const char *filename,
+ unsigned line,
+ const char *section,
+ const char *lvalue,
+ const char *rvalue,
+ void *data,
+ void *userdata) {
+
+ char **s = data;
+ char *n;
+
+ assert(filename);
+ assert(lvalue);
+ assert(rvalue);
+ assert(data);
+
+ if (!path_is_absolute(rvalue)) {
+ log_error("[%s:%u] Not an absolute path: %s", filename, line, rvalue);
+ return -EINVAL;
+ }
+
+ if (!(n = strdup(rvalue)))
+ return -ENOMEM;
+
+ free(*s);
+ *s = n;
+
+ return 0;
+}
+
+int config_parse_strv(
+ const char *filename,
+ unsigned line,
+ const char *section,
+ const char *lvalue,
+ const char *rvalue,
+ void *data,
+ void *userdata) {
+
+ char*** sv = data;
+ char **n;
+ char *w;
+ unsigned k;
+ size_t l;
+ char *state;
+
+ assert(filename);
+ assert(lvalue);
+ assert(rvalue);
+ assert(data);
+
+ k = strv_length(*sv);
+ FOREACH_WORD_QUOTED(w, l, rvalue, state)
+ k++;
+
+ if (!(n = new(char*, k+1)))
+ return -ENOMEM;
+
+ if (*sv)
+ for (k = 0; (*sv)[k]; k++)
+ n[k] = (*sv)[k];
+ else
+ k = 0;
+
+ FOREACH_WORD_QUOTED(w, l, rvalue, state)
+ if (!(n[k++] = strndup(w, l)))
+ goto fail;
+
+ n[k] = NULL;
+ free(*sv);
+ *sv = n;
+
+ return 0;
+
+fail:
+ for (; k > 0; k--)
+ free(n[k-1]);
+ free(n);
+
+ return -ENOMEM;
+}
+
+int config_parse_path_strv(
+ const char *filename,
+ unsigned line,
+ const char *section,
+ const char *lvalue,
+ const char *rvalue,
+ void *data,
+ void *userdata) {
+
+ char*** sv = data;
+ char **n;
+ char *w;
+ unsigned k;
+ size_t l;
+ char *state;
+ int r;
+
+ assert(filename);
+ assert(lvalue);
+ assert(rvalue);
+ assert(data);
+
+ k = strv_length(*sv);
+ FOREACH_WORD_QUOTED(w, l, rvalue, state)
+ k++;
+
+ if (!(n = new(char*, k+1)))
+ return -ENOMEM;
+
+ k = 0;
+ if (*sv)
+ for (; (*sv)[k]; k++)
+ n[k] = (*sv)[k];
+
+ FOREACH_WORD_QUOTED(w, l, rvalue, state) {
+ if (!(n[k] = strndup(w, l))) {
+ r = -ENOMEM;
+ goto fail;
+ }
+
+ if (!path_is_absolute(n[k])) {
+ log_error("[%s:%u] Not an absolute path: %s", filename, line, rvalue);
+ r = -EINVAL;
+ goto fail;
+ }
+
+ k++;
+ }
+
+ n[k] = NULL;
+ free(*sv);
+ *sv = n;
+
+ return 0;
+
+fail:
+ free(n[k]);
+ for (; k > 0; k--)
+ free(n[k-1]);
+ free(n);
+
+ return r;
+}
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