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authorDavid Oberhollenzer <david.oberhollenzer@tele2.at>2018-03-25 12:14:06 +0200
committerDavid Oberhollenzer <david.oberhollenzer@tele2.at>2018-03-25 12:14:06 +0200
commita71c92b33dc69bc6cbc5eae161f82a5bca27a82f (patch)
tree917eaeb4b2460345e122a00cbc32c7398f438d39 /lib/src/rdsvc.c
parenta108beaaf7b19198acbcc5435708d4ff0c8fb5df (diff)
Unify naming of service to shorthand svc
Signed-off-by: David Oberhollenzer <david.oberhollenzer@tele2.at>
Diffstat (limited to 'lib/src/rdsvc.c')
-rw-r--r--lib/src/rdsvc.c251
1 files changed, 251 insertions, 0 deletions
diff --git a/lib/src/rdsvc.c b/lib/src/rdsvc.c
new file mode 100644
index 0000000..972f7e4
--- /dev/null
+++ b/lib/src/rdsvc.c
@@ -0,0 +1,251 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
+/*
+ * Copyright (C) 2018 - David Oberhollenzer
+ *
+ * This program 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 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 this program. If not, see <https://www.gnu.org/licenses/>.
+ */
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <string.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <errno.h>
+#include <fcntl.h>
+
+#include "service.h"
+#include "util.h"
+
+static int svc_name(service_t *svc, char *arg,
+ const char *filename, size_t lineno)
+{
+ (void)filename; (void)lineno;
+ svc->name = arg;
+ return 0;
+}
+
+static int svc_desc(service_t *svc, char *arg,
+ const char *filename, size_t lineno)
+{
+ (void)filename; (void)lineno;
+ svc->desc = arg;
+ return 0;
+}
+
+static int svc_tty(service_t *svc, char *arg,
+ const char *filename, size_t lineno)
+{
+ (void)filename; (void)lineno;
+ svc->ctty = arg;
+ return 0;
+}
+
+static int svc_exec(service_t *svc, char *arg,
+ const char *filename, size_t lineno)
+{
+ char **new = realloc(svc->exec, sizeof(char*) * (svc->num_exec + 1));
+
+ if (new == NULL) {
+ fprintf(stderr, "%s: %zu: out of memory\n", filename, lineno);
+ free(arg);
+ return -1;
+ }
+
+ svc->exec = new;
+ svc->exec[svc->num_exec++] = arg;
+ return 0;
+}
+
+static int svc_before(service_t *svc, char *arg,
+ const char *filename, size_t lineno)
+{
+ char **new = realloc(svc->before,
+ sizeof(char*) * (svc->num_before + 1));
+
+ if (new == NULL) {
+ fprintf(stderr, "%s: %zu: out of memory\n", filename, lineno);
+ free(arg);
+ return -1;
+ }
+
+ svc->before = new;
+ svc->before[svc->num_before++] = arg;
+ return 0;
+}
+
+static int svc_after(service_t *svc, char *arg,
+ const char *filename, size_t lineno)
+{
+ char **new = realloc(svc->after, sizeof(char*) * (svc->num_after + 1));
+
+ if (new == NULL) {
+ fprintf(stderr, "%s: %zu: out of memory\n", filename, lineno);
+ free(arg);
+ return -1;
+ }
+
+ svc->after = new;
+ svc->after[svc->num_after++] = arg;
+ return 0;
+}
+
+static int svc_type(service_t *svc, char *arg,
+ const char *filename, size_t lineno)
+{
+ int type = svc_type_from_string(arg);
+
+ if (type == -1) {
+ fprintf(stderr, "%s: %zu: unknown service type '%s'\n",
+ filename, lineno, arg);
+ return -1;
+ }
+
+ svc->type = type;
+ free(arg);
+ return 0;
+}
+
+static int svc_target(service_t *svc, char *arg,
+ const char *filename, size_t lineno)
+{
+ int target = svc_target_from_string(arg);
+
+ if (target == -1) {
+ fprintf(stderr, "%s: %zu: unknown service target '%s'\n",
+ filename, lineno, arg);
+ return -1;
+ }
+
+ svc->target = target;
+ free(arg);
+ return 0;
+}
+
+
+static const struct {
+ const char *key;
+
+ int (*handle)(service_t *svc, char *arg,
+ const char *filename, size_t lineno);
+} svc_params[] = {
+ { "name", svc_name },
+ { "description", svc_desc },
+ { "exec", svc_exec },
+ { "type", svc_type },
+ { "target", svc_target },
+ { "tty", svc_tty },
+ { "before", svc_before },
+ { "after", svc_after },
+};
+
+
+service_t *rdsvc(int dirfd, const char *filename)
+{
+ const char *arg, *args[1];
+ char *line, *key, *value;
+ size_t i, argc, lineno;
+ service_t *svc;
+ int fd;
+
+ fd = openat(dirfd, filename, O_RDONLY);
+ if (fd < 0) {
+ perror(filename);
+ return NULL;
+ }
+
+ arg = strchr(filename, '@');
+ if (arg != NULL) {
+ args[0] = arg + 1;
+ argc = 1;
+ } else {
+ argc = 0;
+ }
+
+ svc = calloc(1, sizeof(*svc));
+ if (svc == NULL) {
+ fputs("out of memory\n", stderr);
+ close(fd);
+ return NULL;
+ }
+
+ for (lineno = 1; ; ++lineno) {
+ errno = 0;
+ line = rdline(fd);
+
+ if (line == NULL) {
+ if (errno != 0) {
+ fprintf(stderr, "read: %s: %zu: %s\n",
+ filename, lineno, strerror(errno));
+ goto fail;
+ }
+ break;
+ }
+
+ if (splitkv(line, &key, &value)) {
+ if (key == NULL) {
+ fprintf(stderr,
+ "%s: %zu: expected <key> = <value>\n",
+ filename, lineno);
+ } else if (value == NULL) {
+ fprintf(stderr,
+ "%s: %zu: expected value after %s\n",
+ filename, lineno, key);
+ } else {
+ fprintf(stderr,
+ "%s: %zu: unexpected arguments "
+ "after key-value pair\n",
+ filename, lineno);
+ }
+ goto fail;
+ }
+
+ if (key == NULL) {
+ free(line);
+ continue;
+ }
+
+ for (i = 0; i < ARRAY_SIZE(svc_params); ++i) {
+ if (!strcmp(svc_params[i].key, key))
+ break;
+ }
+
+ if (i >= ARRAY_SIZE(svc_params)) {
+ fprintf(stderr, "%s: %zu: unknown parameter '%s'\n",
+ filename, lineno, key);
+ goto fail_line;
+ }
+
+ value = strexpand(value, argc, args);
+ if (value == NULL) {
+ fputs("out of memory", stderr);
+ goto fail_line;
+ }
+
+ if (svc_params[i].handle(svc, value, filename, lineno)) {
+ free(value);
+ goto fail_line;
+ }
+
+ free(line);
+ }
+
+ close(fd);
+ return svc;
+fail_line:
+ free(line);
+fail:
+ close(fd);
+ delsvc(svc);
+ return NULL;
+}