Add functions to transmit service status accross initd socket

Signed-off-by: David Oberhollenzer <goliath@infraroot.at>

1 files changed, 65 insertions, 0 deletions

diff --git a/lib/init/init_socket_send_status.c b/lib/init/init_socket_send_status.c
new file mode 100644
index 0000000..ecad94c
--- /dev/null
+++ b/lib/init/init_socket_send_status.c
@@ -0,0 +1,65 @@
+/* SPDX-License-Identifier: ISC */
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+
+#include "initsock.h"
+
+
+static int send_retry(int fd, const void *dst, size_t addrlen,
+		      const void *buffer, size_t size)
+{
+	ssize_t ret;
+retry:
+	ret = sendto(fd, buffer, size, MSG_NOSIGNAL, dst, addrlen);
+	if (ret < 0 && errno == EINTR)
+		goto retry;
+
+	if (ret < 0 || (size_t)ret < size)
+		return -1;
+
+	return 0;
+}
+
+static int send_string(int fd, const void *dst, size_t addrlen,
+		       const char *str)
+{
+	size_t len = strlen(str);
+	uint8_t raw_len[2];
+
+	raw_len[0] = (len >> 8) & 0xFF;
+	raw_len[1] = len & 0xFF;
+
+	if (send_retry(fd, dst, addrlen, raw_len, 2))
+		return -1;
+
+	return len > 0 ? send_retry(fd, dst, addrlen, str, len) : 0;
+}
+
+int init_socket_send_status(int fd, const void *dest_addr, size_t addrlen,
+			    E_SERVICE_STATE state, service_t *svc)
+{
+	uint8_t info[2];
+
+	if (svc == NULL || state == ESS_NONE) {
+		info[0] = ESS_NONE;
+		info[1] = 0;
+	} else {
+		info[0] = state;
+		info[1] = svc->status & 0xFF;
+	}
+
+	if (send_retry(fd, dest_addr, addrlen, info, 2))
+		return -1;
+
+	if (svc != NULL && state != ESS_NONE) {
+		if (send_string(fd, dest_addr, addrlen, svc->fname))
+			return -1;
+		if (send_string(fd, dest_addr, addrlen, svc->name))
+			return -1;
+	}
+	return 0;
+}