load-fragment: make SocketProtocol= accept the empty string

3 files changed, 16 insertions, 31 deletions

diff --git a/src/core/dbus-socket.c b/src/core/dbus-socket.c
index 73bb4c74c8..88e180a037 100644
--- a/src/core/dbus-socket.c
+++ b/src/core/dbus-socket.c
@@ -142,7 +142,10 @@ static inline bool check_size_t_truncation(uint64_t t) {
         return (size_t) t == t;
 }
 
-static inline const char* socket_protocol_to_name_supported(int32_t i) {
+static inline const char* supported_socket_protocol_to_string(int32_t i) {
+        if (i == IPPROTO_IP)
+                return "";
+
         if (!IN_SET(i, IPPROTO_UDPLITE, IPPROTO_SCTP))
                 return NULL;
 
@@ -156,7 +159,7 @@ static BUS_DEFINE_SET_TRANSIENT_PARSE(bind_ipv6_only, SocketAddressBindIPv6Only,
 static BUS_DEFINE_SET_TRANSIENT_STRING_WITH_CHECK(fdname, fdname_is_valid);
 static BUS_DEFINE_SET_TRANSIENT_STRING_WITH_CHECK(ifname, ifname_valid);
 static BUS_DEFINE_SET_TRANSIENT_TO_STRING_ALLOC(ip_tos, "i", int32_t, int, "%" PRIi32, ip_tos_to_string_alloc);
-static BUS_DEFINE_SET_TRANSIENT_TO_STRING(socket_protocol, "i", int32_t, int, "%" PRIi32, socket_protocol_to_name_supported);
+static BUS_DEFINE_SET_TRANSIENT_TO_STRING(socket_protocol, "i", int32_t, int, "%" PRIi32, supported_socket_protocol_to_string);
 
 static int bus_socket_set_transient_property(
                 Socket *s,
diff --git a/src/core/load-fragment-gperf.gperf.m4 b/src/core/load-fragment-gperf.gperf.m4
index a2c59ca4c0..efc40f515b 100644
--- a/src/core/load-fragment-gperf.gperf.m4
+++ b/src/core/load-fragment-gperf.gperf.m4
@@ -330,7 +330,7 @@ Socket.ListenNetlink,            config_parse_socket_listen,         SOCKET_SOCK
 Socket.ListenSpecial,            config_parse_socket_listen,         SOCKET_SPECIAL,                0
 Socket.ListenMessageQueue,       config_parse_socket_listen,         SOCKET_MQUEUE,                 0
 Socket.ListenUSBFunction,        config_parse_socket_listen,         SOCKET_USB_FUNCTION,           0
-Socket.SocketProtocol,           config_parse_socket_protocol,       0,                             0
+Socket.SocketProtocol,           config_parse_socket_protocol,       0,                             offsetof(Socket, socket_protocol)
 Socket.BindIPv6Only,             config_parse_socket_bind,           0,                             offsetof(Socket, bind_ipv6_only)
 Socket.Backlog,                  config_parse_unsigned,              0,                             offsetof(Socket, backlog)
 Socket.BindToDevice,             config_parse_socket_bindtodevice,   0,                             0
diff --git a/src/core/load-fragment.c b/src/core/load-fragment.c
index 5b760d56a3..842f7c3896 100644
--- a/src/core/load-fragment.c
+++ b/src/core/load-fragment.c
@@ -404,40 +404,22 @@ int config_parse_socket_listen(const char *unit,
         return 0;
 }
 
-int config_parse_socket_protocol(const char *unit,
-                                 const char *filename,
-                                 unsigned line,
-                                 const char *section,
-                                 unsigned section_line,
-                                 const char *lvalue,
-                                 int ltype,
-                                 const char *rvalue,
-                                 void *data,
-                                 void *userdata) {
-        Socket *s;
+static int supported_socket_protocol_from_string(const char *s) {
         int r;
 
-        assert(filename);
-        assert(lvalue);
-        assert(rvalue);
-        assert(data);
-
-        s = SOCKET(data);
-
-        r = socket_protocol_from_name(rvalue);
-        if (r < 0) {
-                log_syntax(unit, LOG_ERR, filename, line, r, "Invalid socket protocol '%s', ignoring: %m", rvalue);
-                return 0;
-        } else if (!IN_SET(r, IPPROTO_UDPLITE, IPPROTO_SCTP)) {
-                log_syntax(unit, LOG_ERR, filename, line, 0, "Socket protocol not supported, ignoring: %s", rvalue);
-                return 0;
-        }
+        if (isempty(s))
+                return IPPROTO_IP;
 
-        s->socket_protocol = r;
+        r = socket_protocol_from_name(s);
+        if (r < 0)
+                return -EINVAL;
+        if (!IN_SET(r, IPPROTO_UDPLITE, IPPROTO_SCTP))
+                return -EPROTONOSUPPORT;
 
-        return 0;
+        return r;
 }
 
+DEFINE_CONFIG_PARSE(config_parse_socket_protocol, supported_socket_protocol_from_string, "Failed to parse socket protocol");
 DEFINE_CONFIG_PARSE_ENUM(config_parse_socket_bind, socket_address_bind_ipv6_only_or_bool, SocketAddressBindIPv6Only, "Failed to parse bind IPv6 only value");
 
 int config_parse_exec_nice(