Make mksock() more generic, move to util library

Signed-off-by: David Oberhollenzer <david.oberhollenzer@tele2.at>

1 files changed, 84 insertions, 0 deletions

diff --git a/lib/util/mksock.c b/lib/util/mksock.c
new file mode 100644
index 0000000..ae46096
--- /dev/null
+++ b/lib/util/mksock.c
@@ -0,0 +1,84 @@
+/* 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/socket.h>
+#include <sys/stat.h>
+#include <sys/un.h>
+#include <unistd.h>
+#include <string.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <errno.h>
+
+#include "util.h"
+
+int mksock(const char *path, int flags)
+{
+	struct sockaddr_un un;
+	const char *errmsg;
+	int fd, type;
+
+	type = (flags & SOCK_FLAG_DGRAM) ? SOCK_DGRAM : SOCK_STREAM;
+
+	fd = socket(AF_UNIX, type | SOCK_CLOEXEC, 0);
+	if (fd < 0) {
+		perror("socket");
+		return -1;
+	}
+
+	memset(&un, 0, sizeof(un));
+	un.sun_family = AF_UNIX;
+
+	strcpy(un.sun_path, path);
+
+	if (bind(fd, (struct sockaddr *)&un, sizeof(un))) {
+		errmsg ="bind";
+		goto fail_errno;
+	}
+
+	if (flags & SOCK_FLAG_ROOT_ONLY) {
+		if (chown(path, 0, 0)) {
+			errmsg = "chown";
+			goto fail_errno;
+		}
+
+		if (chmod(path, 0770)) {
+			errmsg = "chmod";
+			goto fail_errno;
+		}
+	} else if (flags & SOCK_FLAG_EVERYONE) {
+		if (chmod(path, 0777)) {
+			errmsg = "chmod";
+			goto fail_errno;
+		}
+	}
+
+	if (!(flags & SOCK_FLAG_DGRAM)) {
+		if (listen(fd, 10)) {
+			errmsg = "listen";
+			goto fail_errno;
+		}
+	}
+
+	return fd;
+fail_errno:
+	fprintf(stderr, "%s: %s: %s\n", path, errmsg, strerror(errno));
+	close(fd);
+	unlink(path);
+	return -1;
+}