1 files changed, 297 insertions, 0 deletions
diff --git a/lib/init/rdsvc.c b/lib/init/rdsvc.c
new file mode 100644
index 0000000..ca60731
--- /dev/null
+++ b/lib/init/rdsvc.c
@@ -0,0 +1,297 @@
+/* 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 <ctype.h>
+
+#include "service.h"
+#include "libcfg.h"
+#include "util.h"
+
+static int try_unescape(char *arg, rdline_t *rd)
+{
+	if (unescape(arg)) {
+		fprintf(stderr, "%s: %zu: malformed string constant\n",
+			rd->filename, rd->lineno);
+		return -1;
+	}
+	return 0;
+}
+
+static char *try_strdup(const char *str, rdline_t *rd)
+{
+	char *out = strdup(str);
+
+	if (out == NULL) {
+		fprintf(stderr, "%s: %zu: out of memory\n",
+			rd->filename, rd->lineno);
+	}
+	return out;
+}
+
+static int try_pack_argv(char *str, rdline_t *rd)
+{
+	int count = pack_argv(str);
+	if (count < 0) {
+		fprintf(stderr, "%s: %zu: malformed string constant\n",
+			rd->filename, rd->lineno);
+	}
+	return count;
+}
+
+static int svc_desc(void *user, char *arg, rdline_t *rd, int flags)
+{
+	service_t *svc = user;
+	(void)flags;
+
+	if (try_unescape(arg, rd))
+		return -1;
+	svc->desc = try_strdup(arg, rd);
+	return svc->desc == NULL ? -1 : 0;
+}
+
+static int svc_tty(void *user, char *arg, rdline_t *rd, int flags)
+{
+	service_t *svc = user;
+
+	if (flags & RDSVC_NO_CTTY)
+		return 0;
+
+	if (strncmp(arg, "truncate", 8) == 0 && isspace(arg[8])) {
+		svc->flags |= SVC_FLAG_TRUNCATE_OUT;
+		arg += 8;
+		while (isspace(*arg))
+			++arg;
+	}
+
+	if (try_unescape(arg, rd))
+		return -1;
+
+	svc->ctty = try_strdup(arg, rd);
+	return svc->ctty == NULL ? -1 : 0;
+}
+
+static int svc_exec(void *user, char *arg, rdline_t *rd, int flags)
+{
+	service_t *svc = user;
+	exec_t *e, *end;
+
+	if (flags & RDSVC_NO_EXEC)
+		return 0;
+
+	e = calloc(1, sizeof(*e) + strlen(arg) + 1);
+	if (e == NULL) {
+		fprintf(stderr, "%s: %zu: out of memory\n",
+			rd->filename, rd->lineno);
+		return -1;
+	}
+
+	strcpy(e->args, arg);
+
+	e->argc = try_pack_argv(e->args, rd);
+	if (e->argc < 0)
+		return -1;
+
+	if (svc->exec == NULL) {
+		svc->exec = e;
+	} else {
+		for (end = svc->exec; end->next != NULL; end = end->next)
+			;
+		end->next = e;
+	}
+	return 0;
+}
+
+static int svc_before(void *user, char *arg, rdline_t *rd, int flags)
+{
+	service_t *svc = user;
+
+	if (flags & RDSVC_NO_DEPS)
+		return 0;
+
+	if (svc->before != NULL) {
+		fprintf(stderr, "%s: %zu: 'before' dependencies respecified\n",
+			rd->filename, rd->lineno);
+		return -1;
+	}
+
+	svc->before = try_strdup(arg, rd);
+	if (svc->before == NULL)
+		return -1;
+
+	svc->num_before = try_pack_argv(svc->before, rd);
+	return (svc->num_before < 0) ? -1 : 0;
+}
+
+static int svc_after(void *user, char *arg, rdline_t *rd, int flags)
+{
+	service_t *svc = user;
+
+	if (flags & RDSVC_NO_DEPS)
+		return 0;
+
+	if (svc->after != NULL) {
+		fprintf(stderr, "%s: %zu: 'after' dependencies respecified\n",
+			rd->filename, rd->lineno);
+		return -1;
+	}
+
+	svc->after = try_strdup(arg, rd);
+	if (svc->after == NULL)
+		return -1;
+
+	svc->num_after = try_pack_argv(svc->after, rd);
+	return (svc->num_after < 0) ? -1 : 0;
+}
+
+static int svc_type(void *user, char *arg, rdline_t *rd, int flags)
+{
+	service_t *svc = user;
+	int count = try_pack_argv(arg, rd);
+	(void)flags;
+
+	if (count < 1)
+		return -1;
+
+	svc->type = svc_type_from_string(arg);
+
+	if (svc->type == -1) {
+		fprintf(stderr, "%s: %zu: unknown service type '%s'\n",
+			rd->filename, rd->lineno, arg);
+		return -1;
+	}
+
+	if (count > 1) {
+		arg += strlen(arg) + 1;
+
+		switch (svc->type) {
+		case SVC_RESPAWN:
+			if (strcmp(arg, "limit") != 0)
+				goto fail_limit;
+			arg += strlen(arg) + 1;
+
+			if (count > 3)
+				goto fail_args;
+			if (!isdigit(*arg))
+				goto fail_limit;
+			svc->rspwn_limit = atoi(arg);
+			break;
+		default:
+			goto fail_args;
+		}
+	}
+
+	return 0;
+fail_args:
+	fprintf(stderr, "%s: %zu: unexpected extra arguments\n",
+		rd->filename, rd->lineno);
+	return -1;
+fail_limit:
+	fprintf(stderr, "%s: %zu: expected 'limit <value>' after 'respawn'\n",
+		rd->filename, rd->lineno);
+	return -1;
+}
+
+static int svc_target(void *user, char *arg, rdline_t *rd, int flags)
+{
+	service_t *svc = user;
+	int target;
+	(void)flags;
+
+	if (try_unescape(arg, rd))
+		return -1;
+
+	target = svc_target_from_string(arg);
+
+	if (target == -1) {
+		fprintf(stderr, "%s: %zu: unknown service target '%s'\n",
+			rd->filename, rd->lineno, arg);
+		return -1;
+	}
+
+	svc->target = target;
+	return 0;
+}
+
+static const cfg_param_t svc_params[] = {
+	{ "description", 0, svc_desc },
+	{ "exec", 1, svc_exec },
+	{ "type", 0, svc_type },
+	{ "target", 0, svc_target },
+	{ "tty", 0, svc_tty },
+	{ "before", 0, svc_before },
+	{ "after", 0, svc_after },
+};
+
+service_t *rdsvc(int dirfd, const char *filename, int flags)
+{
+	const char *arg, *args[1];
+	service_t *svc = NULL;
+	size_t argc, nlen;
+	rdline_t rd;
+	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;
+	}
+
+	nlen = (arg != NULL) ? (size_t)(arg - filename) : strlen(filename);
+
+	svc = calloc(1, sizeof(*svc) + nlen + 1);
+	if (svc == NULL)
+		goto fail_oom;
+
+	if (!(flags & RDSVC_NO_FNAME)) {
+		svc->fname = strdup(filename);
+		if (svc->fname == NULL)
+			goto fail_oom;
+	}
+
+	memcpy(svc->name, filename, nlen);
+
+	rdline_init(&rd, fd, filename, argc, args);
+
+	if (rdcfg(svc, &rd, svc_params, ARRAY_SIZE(svc_params), flags)) {
+		delsvc(svc);
+		svc = NULL;
+	}
+
+	rdline_cleanup(&rd);
+	return svc;
+fail_oom:
+	fputs("out of memory\n", stderr);
+	delsvc(svc);
+	close(fd);
+	return NULL;
+}