wasi-sockets: add services table

Author: Henkru

expected/wasm32-wasip2/defined-symbols.txt

@@ -301,10 +301,13 @@ __wasi_sock_accept
 __wasi_sock_recv
 __wasi_sock_send
 __wasi_sock_shutdown
+__wasi_sockets_services_db
 __wasi_sockets_utils__any_addr
 __wasi_sockets_utils__borrow_network
 __wasi_sockets_utils__create_streams
 __wasi_sockets_utils__drop_streams
+__wasi_sockets_utils__get_service_entry_by_name
+__wasi_sockets_utils__get_service_entry_by_port
 __wasi_sockets_utils__map_error
 __wasi_sockets_utils__output_addr_validate
 __wasi_sockets_utils__output_addr_write

libc-bottom-half/headers/private/wasi/sockets_utils.h

@@ -26,6 +26,17 @@ typedef struct {
 	};
 } output_sockaddr_t;
 
+typedef struct {
+	char *s_name;
+	uint16_t port;
+	uint16_t protocol;
+} service_entry_t;
+
+typedef enum {
+	SERVICE_PROTOCOL_TCP = 1,
+	SERVICE_PROTOCOL_UDP = 2
+} service_protocol_e;
+
 network_borrow_network_t __wasi_sockets_utils__borrow_network();
 int __wasi_sockets_utils__map_error(network_error_code_t wasi_error);
 bool __wasi_sockets_utils__parse_address(
@@ -50,5 +61,7 @@ bool __wasi_sockets_utils__stream(udp_socket_t *socket,
 				  network_error_code_t *error);
 void __wasi_sockets_utils__drop_streams(udp_socket_streams_t streams);
 int __wasi_sockets_utils__parse_port(const char *port);
+const service_entry_t *__wasi_sockets_utils__get_service_entry_by_name(const char *name);
+const service_entry_t *__wasi_sockets_utils__get_service_entry_by_port(const uint16_t port);
 
 #endif

libc-bottom-half/sources/sockets_utils.c

@@ -1,11 +1,33 @@
 #include <errno.h>
 #include <stdlib.h>
 #include <ctype.h>
+#include <string.h>
 
 #include <wasi/sockets_utils.h>
 
 static network_own_network_t global_network;
 static bool global_network_initialized = false;
+static const service_entry_t global_services[] = {
+    { "domain",      53,  SERVICE_PROTOCOL_TCP | SERVICE_PROTOCOL_UDP },
+    { "ftp",         21,  SERVICE_PROTOCOL_TCP },
+    { "ftp-data",    20,  SERVICE_PROTOCOL_TCP },
+    { "ftps",        990, SERVICE_PROTOCOL_TCP },
+    { "ftps-data",   989, SERVICE_PROTOCOL_TCP },
+    { "http",        80,  SERVICE_PROTOCOL_TCP | SERVICE_PROTOCOL_UDP },
+    { "https",       443, SERVICE_PROTOCOL_TCP | SERVICE_PROTOCOL_UDP },
+    { "imap",        143, SERVICE_PROTOCOL_TCP },
+    { "imaps",       993, SERVICE_PROTOCOL_TCP },
+    { "ntp",         123, SERVICE_PROTOCOL_TCP },
+    { "pop3",        110, SERVICE_PROTOCOL_TCP },
+    { "pop3s",       995, SERVICE_PROTOCOL_TCP },
+    { "smtp",        25,  SERVICE_PROTOCOL_TCP },
+    { "ssh",         22,  SERVICE_PROTOCOL_TCP },
+    { "submission",  587, SERVICE_PROTOCOL_TCP },
+    { "submissions", 465, SERVICE_PROTOCOL_TCP },
+    { "telnet",      23,  SERVICE_PROTOCOL_TCP },
+    { 0 },
+};
+weak_alias(global_services, __wasi_sockets_services_db);
 
 network_borrow_network_t __wasi_sockets_utils__borrow_network()
 {
@@ -482,3 +504,33 @@ int __wasi_sockets_utils__parse_port(const char *restrict port_str)
 
     return (int)port;
 }
+
+const service_entry_t *__wasi_sockets_utils__get_service_entry_by_name(const char *name)
+{
+    if (!name) {
+        return NULL;
+    }
+
+    const service_entry_t *entry = __wasi_sockets_services_db;
+    while(entry->s_name) {
+        if (strcmp(name, entry->s_name) == 0) {
+            return entry;
+        }
+        ++entry;
+    }
+
+    return NULL;
+}
+
+const service_entry_t *__wasi_sockets_utils__get_service_entry_by_port(const uint16_t port)
+{
+    const service_entry_t *entry = __wasi_sockets_services_db;
+    while(entry->s_name) {
+        if (entry->port == port) {
+            return entry;
+        }
+        ++entry;
+    }
+
+    return NULL;
+}