sd-rtnl: make string returned by sd_rtnl_message_read_string() const

src/libsystemd/sd-rtnl/rtnl-message.c

@@ -786,7 +786,7 @@ int rtnl_message_read_internal(sd_rtnl_message *m, unsigned short type, void **d
         return RTA_PAYLOAD(rta);
 }
 
-int sd_rtnl_message_read_string(sd_rtnl_message *m, unsigned short type, char **data) {
+int sd_rtnl_message_read_string(sd_rtnl_message *m, unsigned short type, const char **data) {
         int r;
         void *attr_data;
 
@@ -800,7 +800,7 @@ int sd_rtnl_message_read_string(sd_rtnl_message *m, unsigned short type, char **
         else if (strnlen(attr_data, r) >= (size_t) r)
                 return -EIO;
 
-        *data = (char *) attr_data;
+        *data = (const char *) attr_data;
 
         return 0;
 }
@@ -962,7 +962,7 @@ int sd_rtnl_message_enter_container(sd_rtnl_message *m, unsigned short type) {
                         return r;
         } else if (nl_type->type == NLA_UNION) {
                 const NLTypeSystemUnion *type_system_union;
-                char *key;
+                const char *key;
 
                 r = type_system_get_type_system_union(m->container_type_system[m->n_containers],
                                                       &type_system_union,

src/libsystemd/sd-rtnl/test-rtnl.c

@@ -35,7 +35,7 @@ static void test_link_configure(sd_rtnl *rtnl, int ifindex) {
         _cleanup_rtnl_message_unref_ sd_rtnl_message *message;
         const char *mac = "98:fe:94:3f:c6:18", *name = "test";
         unsigned int mtu = 1450, mtu_out;
-        char *name_out;
+        const char *name_out;
         struct ether_addr mac_out;
 
         /* we'd really like to test NEWLINK, but let's not mess with the running kernel */
@@ -61,7 +61,7 @@ static void test_link_get(sd_rtnl *rtnl, int ifindex) {
         sd_rtnl_message *m;
         sd_rtnl_message *r;
         unsigned int mtu = 1500;
-        char *str_data;
+        const char *str_data;
         uint8_t u8_data;
         uint32_t u32_data;
         struct ether_addr eth_data;
@@ -108,7 +108,7 @@ static void test_address_get(sd_rtnl *rtnl, int ifindex) {
         sd_rtnl_message *r;
         struct in_addr in_data;
         struct ifa_cacheinfo cache;
-        char *label;
+        const char *label;
 
         assert_se(sd_rtnl_message_new_addr(rtnl, &m, RTM_GETADDR, ifindex, AF_INET) >= 0);
         assert_se(m);
@@ -174,7 +174,8 @@ static void test_multiple(void) {
 }
 
 static int link_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) {
-        char *ifname = userdata, *data;
+        char *ifname = userdata;
+        const char *data;
 
         assert_se(rtnl);
         assert_se(m);
@@ -277,7 +278,7 @@ static void test_container(void) {
         _cleanup_rtnl_message_unref_ sd_rtnl_message *m = NULL;
         uint16_t u16_data;
         uint32_t u32_data;
-        char *string_data;
+        const char *string_data;
 
         assert_se(sd_rtnl_message_new_link(NULL, &m, RTM_NEWLINK, 0) >= 0);
 
@@ -355,7 +356,7 @@ int main(void) {
         sd_rtnl *rtnl;
         sd_rtnl_message *m;
         sd_rtnl_message *r;
-        char *string_data;
+        const char *string_data;
         int if_loopback;
         uint16_t type;
 

src/network/networkd-link.c

@@ -42,7 +42,7 @@ static bool ipv4ll_is_bound(sd_ipv4ll *ll);
 static int link_new(Manager *manager, sd_rtnl_message *message, Link **ret) {
         _cleanup_link_unref_ Link *link = NULL;
         uint16_t type;
-        char *ifname;
+        const char *ifname;
         int r, ifindex;
 
         assert(manager);
@@ -2337,7 +2337,7 @@ int link_add(Manager *m, sd_rtnl_message *message, Link **ret) {
 
 int link_update(Link *link, sd_rtnl_message *m) {
         struct ether_addr mac;
-        char *ifname;
+        const char *ifname;
         int r;
 
         assert(link);

src/network/networkd-manager.c

@@ -227,7 +227,7 @@ static int manager_rtnl_process_link(sd_rtnl *rtnl, sd_rtnl_message *message, vo
         Link *link = NULL;
         NetDev *netdev = NULL;
         uint16_t type;
-        char *name;
+        const char *name;
         int r, ifindex;
 
         assert(rtnl);

src/network/networkd-netdev.c

@@ -341,8 +341,8 @@ int netdev_join(NetDev *netdev, Link *link, sd_rtnl_message_handler_t callback)
 int netdev_set_ifindex(NetDev *netdev, sd_rtnl_message *message) {
         uint16_t type;
         const char *kind;
-        char *received_kind;
-        char *received_name;
+        const char *received_kind;
+        const char *received_name;
         int r, ifindex;
 
         assert(netdev);

src/systemd/sd-rtnl.h

@@ -112,7 +112,7 @@ int sd_rtnl_message_open_container(sd_rtnl_message *m, unsigned short type);
 int sd_rtnl_message_open_container_union(sd_rtnl_message *m, unsigned short type, const char *key);
 int sd_rtnl_message_close_container(sd_rtnl_message *m);
 
-int sd_rtnl_message_read_string(sd_rtnl_message *m, unsigned short type, char **data);
+int sd_rtnl_message_read_string(sd_rtnl_message *m, unsigned short type, const char **data);
 int sd_rtnl_message_read_u8(sd_rtnl_message *m, unsigned short type, uint8_t *data);
 int sd_rtnl_message_read_u16(sd_rtnl_message *m, unsigned short type, uint16_t *data);
 int sd_rtnl_message_read_u32(sd_rtnl_message *m, unsigned short type, uint32_t *data);