From 7888c8796197357f0214ea5fe17b11a8814fc313 Mon Sep 17 00:00:00 2001
From: Yu Watanabe <watanabe.yu+github@gmail.com>
Date: Sun, 15 Dec 2019 21:47:21 +0900
Subject: [PATCH] sd-netlink: introduce sd_netlink_message_append_strv()

(cherry picked from commit 6d725977c4f98a8f5effc33f44aa646cc2b6a0b7)

Related: #1850986
---
 src/libsystemd/sd-netlink/netlink-message.c | 29 +++++++++++++++++++++
 src/systemd/sd-netlink.h                    |  1 +
 2 files changed, 30 insertions(+)

diff --git a/src/libsystemd/sd-netlink/netlink-message.c b/src/libsystemd/sd-netlink/netlink-message.c
index 5723e1d21c..55d6510b63 100644
--- a/src/libsystemd/sd-netlink/netlink-message.c
+++ b/src/libsystemd/sd-netlink/netlink-message.c
@@ -259,6 +259,35 @@ int sd_netlink_message_append_string(sd_netlink_message *m, unsigned short type,
         return 0;
 }
 
+int sd_netlink_message_append_strv(sd_netlink_message *m, unsigned short type, char * const *data) {
+        size_t length, size;
+        char * const *p;
+        int r;
+
+        assert_return(m, -EINVAL);
+        assert_return(!m->sealed, -EPERM);
+        assert_return(data, -EINVAL);
+
+        r = message_attribute_has_type(m, &size, type, NETLINK_TYPE_STRING);
+        if (r < 0)
+                return r;
+
+        STRV_FOREACH(p, data) {
+                if (size) {
+                        length = strnlen(*p, size+1);
+                        if (length > size)
+                                return -EINVAL;
+                } else
+                        length = strlen(*p);
+
+                r = add_rtattr(m, type, *p, length + 1);
+                if (r < 0)
+                        return r;
+        }
+
+        return 0;
+}
+
 int sd_netlink_message_append_flag(sd_netlink_message *m, unsigned short type) {
         size_t size;
         int r;
diff --git a/src/systemd/sd-netlink.h b/src/systemd/sd-netlink.h
index 1f5c093f11..5a05cd4485 100644
--- a/src/systemd/sd-netlink.h
+++ b/src/systemd/sd-netlink.h
@@ -67,6 +67,7 @@ int sd_netlink_attach_event(sd_netlink *nl, sd_event *e, int64_t priority);
 int sd_netlink_detach_event(sd_netlink *nl);
 
 int sd_netlink_message_append_string(sd_netlink_message *m, unsigned short type, const char *data);
+int sd_netlink_message_append_strv(sd_netlink_message *m, unsigned short type, char * const *data);
 int sd_netlink_message_append_flag(sd_netlink_message *m, unsigned short type);
 int sd_netlink_message_append_u8(sd_netlink_message *m, unsigned short type, uint8_t data);
 int sd_netlink_message_append_u16(sd_netlink_message *m, unsigned short type, uint16_t data);