From 3c31ef05ba732e3ab5d23761c5f84768ca8de68e Mon Sep 17 00:00:00 2001
From: Yu Watanabe <watanabe.yu+github@gmail.com>
Date: Sun, 15 Dec 2019 21:32:25 +0900
Subject: [PATCH] sd-netlink: introduce sd_netlink_message_read_strv()

The combination of sd_netlink_message_enter_container() and
sd_netlink_message_read_string() only reads the last element if the attribute is
duplicated, such a situation easily happens for IFLA_ALT_IFNAME.
The function introduced here reads all matched attributes.

(cherry picked from commit 8f3c1859669230c2c8458675f41de13e369b47e7)

Related: #1850986
---
 src/libsystemd/sd-netlink/netlink-message.c | 58 +++++++++++++++++++++
 src/systemd/sd-netlink.h                    |  1 +
 2 files changed, 59 insertions(+)

diff --git a/src/libsystemd/sd-netlink/netlink-message.c b/src/libsystemd/sd-netlink/netlink-message.c
index db9101c163..5723e1d21c 100644
--- a/src/libsystemd/sd-netlink/netlink-message.c
+++ b/src/libsystemd/sd-netlink/netlink-message.c
@@ -14,6 +14,7 @@
 #include "netlink-util.h"
 #include "refcnt.h"
 #include "socket-util.h"
+#include "strv.h"
 #include "util.h"
 
 #define GET_CONTAINER(m, i) ((i) < (m)->n_containers ? (struct rtattr*)((uint8_t*)(m)->hdr + (m)->containers[i].offset) : NULL)
@@ -754,6 +755,63 @@ int sd_netlink_message_read_in6_addr(sd_netlink_message *m, unsigned short type,
         return 0;
 }
 
+int sd_netlink_message_read_strv(sd_netlink_message *m, unsigned short container_type, unsigned short type_id, char ***ret) {
+        _cleanup_strv_free_ char **s = NULL;
+        const NLTypeSystem *type_system;
+        const NLType *nl_type;
+        struct rtattr *rta;
+        void *container;
+        unsigned short rt_len;
+        int r;
+
+        assert_return(m, -EINVAL);
+        assert_return(m->n_containers < RTNL_CONTAINER_DEPTH, -EINVAL);
+
+        r = type_system_get_type(m->containers[m->n_containers].type_system,
+                                 &nl_type,
+                                 container_type);
+        if (r < 0)
+                return r;
+
+        if (type_get_type(nl_type) != NETLINK_TYPE_NESTED)
+                return -EINVAL;
+
+        r = type_system_get_type_system(m->containers[m->n_containers].type_system,
+                                        &type_system,
+                                        container_type);
+        if (r < 0)
+                return r;
+
+        r = type_system_get_type(type_system, &nl_type, type_id);
+        if (r < 0)
+                return r;
+
+        if (type_get_type(nl_type) != NETLINK_TYPE_STRING)
+                return -EINVAL;
+
+        r = netlink_message_read_internal(m, container_type, &container, NULL);
+        if (r < 0)
+                return r;
+
+        rt_len = (unsigned short) r;
+        rta = container;
+
+        for (; RTA_OK(rta, rt_len); rta = RTA_NEXT(rta, rt_len)) {
+                unsigned short type;
+
+                type = RTA_TYPE(rta);
+                if (type != type_id)
+                        continue;
+
+                r = strv_extend(&s, RTA_DATA(rta));
+                if (r < 0)
+                        return r;
+        }
+
+        *ret = TAKE_PTR(s);
+        return 0;
+}
+
 static int netlink_container_parse(sd_netlink_message *m,
                                    struct netlink_container *container,
                                    int count,
diff --git a/src/systemd/sd-netlink.h b/src/systemd/sd-netlink.h
index 51f0fa16b4..1f5c093f11 100644
--- a/src/systemd/sd-netlink.h
+++ b/src/systemd/sd-netlink.h
@@ -82,6 +82,7 @@ int sd_netlink_message_open_container_union(sd_netlink_message *m, unsigned shor
 int sd_netlink_message_close_container(sd_netlink_message *m);
 
 int sd_netlink_message_read_string(sd_netlink_message *m, unsigned short type, const char **data);
+int sd_netlink_message_read_strv(sd_netlink_message *m, unsigned short container_type, unsigned short type_id, char ***ret);
 int sd_netlink_message_read_u8(sd_netlink_message *m, unsigned short type, uint8_t *data);
 int sd_netlink_message_read_u16(sd_netlink_message *m, unsigned short type, uint16_t *data);
 int sd_netlink_message_read_u32(sd_netlink_message *m, unsigned short type, uint32_t *data);