sockets: Improve helpers to make sockets more readable

Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com>
Signed-off-by: Andrei Vagin <avagin@gmail.com>

criu/include/sockets.h

 #ifndef __CR_SOCKETS_H__
 #define __CR_SOCKETS_H__
 
+#include <alloca.h>
 #include <stdbool.h>
 #include <sys/socket.h>
 
@@ -96,7 +97,26 @@ extern int set_netns(uint32_t ns_id);
 extern int kerndat_socket_netns(void);
 extern int kerndat_socket_unix_file(void);
 
-extern const char *tcp_state_name(unsigned int state);
-extern const char *socket_type_name(unsigned int type);
+extern const char *tcp_state_name(unsigned int state, char *nm, size_t size);
+extern const char *socket_type_name(unsigned int type, char *nm, size_t size);
+extern const char *socket_family_name(unsigned int family, char *nm, size_t size);
+extern const char *socket_proto_name(unsigned int proto, char *nm, size_t size);
+
+#define __tcp_state_name(state, a)	tcp_state_name(state, a, sizeof(a))
+#define __socket_type_name(type, a)	socket_type_name(type, a, sizeof(a))
+#define __socket_family_name(family, a)	socket_family_name(family, a, sizeof(a))
+#define __socket_proto_name(proto, a)	socket_proto_name(proto, a, sizeof(a))
+
+#define __socket_info_helper(__h, __v)				\
+	({							\
+		char *__nm = alloca(32);			\
+		const char *__r = __h(__v, __nm, 32);		\
+		__r;						\
+	})
+
+#define ___tcp_state_name(state)	__socket_info_helper(tcp_state_name, state)
+#define ___socket_type_name(type)	__socket_info_helper(socket_type_name, type)
+#define ___socket_family_name(family)	__socket_info_helper(socket_family_name, family)
+#define ___socket_proto_name(proto)	__socket_info_helper(socket_proto_name, proto)
 
 #endif /* __CR_SOCKETS_H__ */

criu/sk-unix.c

@@ -2060,9 +2060,12 @@ int unix_prepare_root_shared(void)
 	pr_debug("ghost: Resolving addresses\n");
 
 	list_for_each_entry(ui, &unix_ghost_addr, ghost_node) {
+		char tp_name[32];
+		char st_name[32];
+
 		pr_debug("ghost: id %#x type %s state %s ino %d peer %d address %s\n",
-			 ui->ue->id, socket_type_name(ui->ue->type),
-			 tcp_state_name(ui->ue->state),
+			 ui->ue->id, __socket_type_name(ui->ue->type, tp_name),
+			 __tcp_state_name(ui->ue->state, st_name),
 			 ui->ue->ino, ui->peer ? ui->peer->ue->ino : 0,
 			 ui->name);
 
@@ -2109,9 +2112,9 @@ static int collect_one_unixsk(void *o, ProtobufCMessage *base, struct cr_img *i)
 	}
 
 	pr_info(" `- Got id %#x ino %d type %s state %s peer %d (name %s%.*s dir %s)\n",
-		ui->ue->id, ui->ue->ino, socket_type_name(ui->ue->type),
-		tcp_state_name(ui->ue->state), ui->ue->peer, prefix, ulen, uname,
-		ui->name_dir ? ui->name_dir : "-");
+		ui->ue->id, ui->ue->ino, ___socket_type_name(ui->ue->type),
+		___tcp_state_name(ui->ue->state), ui->ue->peer, prefix, ulen,
+		uname, ui->name_dir ? ui->name_dir : "-");
 
 	if (ui->ue->peer || ui->name) {
 		if (ui->ue->peer)

criu/sockets.c

@@ -42,7 +42,54 @@
 #define SO_GET_FILTER	SO_ATTACH_FILTER
 #endif
 
-const char *socket_type_name(unsigned int type)
+static const char *__socket_const_name(char *dst, size_t len, const char **a, size_t n, unsigned int v)
+{
+	if (v < n) {
+		const char *name = a[v];
+		if (name)
+			return name;
+	}
+	snprintf(dst, len, "%u", v);
+	return dst;
+}
+
+const char *socket_proto_name(unsigned int proto, char *nm, size_t size)
+{
+	static const char *protos[] = {
+		[IPPROTO_IP]		= __stringify_1(IPPROTO_IP),
+		[IPPROTO_ICMP]		= __stringify_1(IPPROTO_ICMP),
+		[IPPROTO_IGMP]		= __stringify_1(IPPROTO_IGMP),
+		[IPPROTO_IPIP]		= __stringify_1(IPPROTO_IPIP),
+		[IPPROTO_TCP]		= __stringify_1(IPPROTO_TCP),
+		[IPPROTO_EGP]		= __stringify_1(IPPROTO_EGP),
+		[IPPROTO_UDP]		= __stringify_1(IPPROTO_UDP),
+		[IPPROTO_DCCP]		= __stringify_1(IPPROTO_DCCP),
+		[IPPROTO_IPV6]		= __stringify_1(IPPROTO_IPV6),
+		[IPPROTO_RSVP]		= __stringify_1(IPPROTO_RSVP),
+		[IPPROTO_GRE]		= __stringify_1(IPPROTO_GRE),
+		[IPPROTO_ESP]		= __stringify_1(IPPROTO_ESP),
+		[IPPROTO_AH]		= __stringify_1(IPPROTO_AH),
+		[IPPROTO_UDPLITE]	= __stringify_1(IPPROTO_UDPLITE),
+		[IPPROTO_RAW]		= __stringify_1(IPPROTO_RAW),
+	};
+	return __socket_const_name(nm, size, protos, ARRAY_SIZE(protos), proto);
+}
+
+const char *socket_family_name(unsigned int family, char *nm, size_t size)
+{
+	static const char *families[] = {
+		[AF_UNIX]		= __stringify_1(AF_UNIX),
+		[AF_INET]		= __stringify_1(AF_INET),
+		[AF_BRIDGE]		= __stringify_1(AF_BRIDGE),
+		[AF_INET6]		= __stringify_1(AF_INET6),
+		[AF_KEY]		= __stringify_1(AF_KEY),
+		[AF_NETLINK]		= __stringify_1(AF_NETLINK),
+		[AF_PACKET]		= __stringify_1(AF_PACKET),
+	};
+	return __socket_const_name(nm, size, families, ARRAY_SIZE(families), family);
+}
+
+const char *socket_type_name(unsigned int type, char *nm, size_t size)
 {
 	static const char *types[] = {
 		[SOCK_STREAM]		= __stringify_1(SOCK_STREAM),
@@ -51,17 +98,10 @@ const char *socket_type_name(unsigned int type)
 		[SOCK_SEQPACKET]	= __stringify_1(SOCK_SEQPACKET),
 		[SOCK_PACKET]		= __stringify_1(SOCK_PACKET),
 	};
-       size_t i;
-
-       for (i = 0; i < ARRAY_SIZE(types); i++) {
-               if (type == i)
-                       return types[i];
-       }
-
-       return "UNKNOWN";
+	return __socket_const_name(nm, size, types, ARRAY_SIZE(types), type);
 }
 
-const char *tcp_state_name(unsigned int state)
+const char *tcp_state_name(unsigned int state, char *nm, size_t size)
 {
 	static const char *states[] = {
 		[TCP_ESTABLISHED]	= __stringify_1(TCP_ESTABLISHED),
@@ -76,14 +116,7 @@ const char *tcp_state_name(unsigned int state)
 		[TCP_LISTEN]		= __stringify_1(TCP_LISTEN),
 		[TCP_CLOSING]		= __stringify_1(TCP_CLOSING),
 	};
-       size_t i;
-
-       for (i = 0; i < ARRAY_SIZE(states); i++) {
-               if (state == i)
-                       return states[i];
-       }
-
-       return "UNKNOWN";
+	return __socket_const_name(nm, size, states, ARRAY_SIZE(states), state);
 }
 
 struct sock_diag_greq {