Add net_if_null, a no-op net interface

Can be used for cases where device has no networking but mongoose is still needed for its event loop.

CL: mg: Add net_if_null, a no-op net interface

PUBLISHED_FROM=e79b4a8667508bbde1437dda9dad77ce3a3aa630

mongoose.c

@@ -3594,6 +3594,150 @@ double mg_mgr_min_timer(const struct mg_mgr *mgr) {
   return min_timer;
 }
 #ifdef MG_MODULE_LINES
+#line 1 "mongoose/src/mg_net_if_null.c"
+#endif
+/*
+ * Copyright (c) 2018 Cesanta Software Limited
+ * All rights reserved
+ *
+ * This software is dual-licensed: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation. For the terms of this
+ * license, see <http://www.gnu.org/licenses/>.
+ *
+ * You are free to use this software under the terms of the GNU General
+ * Public License, but WITHOUT ANY WARRANTY; without even the implied
+ * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ * See the GNU General Public License for more details.
+ *
+ * Alternatively, you can license this software under a commercial
+ * license, as set out in <https://www.cesanta.com/license>.
+ */
+
+static void mg_null_if_connect_tcp(struct mg_connection *c,
+                                   const union socket_address *sa) {
+  c->flags |= MG_F_CLOSE_IMMEDIATELY;
+  (void) sa;
+}
+
+static void mg_null_if_connect_udp(struct mg_connection *c) {
+  c->flags |= MG_F_CLOSE_IMMEDIATELY;
+}
+
+static int mg_null_if_listen_tcp(struct mg_connection *c,
+                                 union socket_address *sa) {
+  (void) c;
+  (void) sa;
+  return -1;
+}
+
+static int mg_null_if_listen_udp(struct mg_connection *c,
+                                 union socket_address *sa) {
+  (void) c;
+  (void) sa;
+  return -1;
+}
+
+static int mg_null_if_tcp_send(struct mg_connection *c, const void *buf,
+                               size_t len) {
+  (void) c;
+  (void) buf;
+  (void) len;
+  return -1;
+}
+
+static int mg_null_if_udp_send(struct mg_connection *c, const void *buf,
+                               size_t len) {
+  (void) c;
+  (void) buf;
+  (void) len;
+  return -1;
+}
+
+int mg_null_if_tcp_recv(struct mg_connection *c, void *buf, size_t len) {
+  (void) c;
+  (void) buf;
+  (void) len;
+  return -1;
+}
+
+int mg_null_if_udp_recv(struct mg_connection *c, void *buf, size_t len,
+                        union socket_address *sa, size_t *sa_len) {
+  (void) c;
+  (void) buf;
+  (void) len;
+  (void) sa;
+  (void) sa_len;
+  return -1;
+}
+
+static int mg_null_if_create_conn(struct mg_connection *c) {
+  (void) c;
+  return -1;
+}
+
+static void mg_null_if_destroy_conn(struct mg_connection *c) {
+  (void) c;
+}
+
+static void mg_null_if_sock_set(struct mg_connection *c, sock_t sock) {
+  (void) c;
+  (void) sock;
+}
+
+static void mg_null_if_init(struct mg_iface *iface) {
+  (void) iface;
+}
+
+static void mg_null_if_free(struct mg_iface *iface) {
+  (void) iface;
+}
+
+static void mg_null_if_add_conn(struct mg_connection *c) {
+  c->sock = INVALID_SOCKET;
+  c->flags |= MG_F_CLOSE_IMMEDIATELY;
+}
+
+static void mg_null_if_remove_conn(struct mg_connection *c) {
+  (void) c;
+}
+
+static time_t mg_null_if_poll(struct mg_iface *iface, int timeout_ms) {
+  struct mg_mgr *mgr = iface->mgr;
+  struct mg_connection *nc, *tmp;
+  double now = mg_time();
+  /* We basically just run timers and poll. */
+  for (nc = mgr->active_connections; nc != NULL; nc = tmp) {
+    tmp = nc->next;
+    mg_if_poll(nc, now);
+  }
+  (void) timeout_ms;
+  return (time_t) now;
+}
+
+static void mg_null_if_get_conn_addr(struct mg_connection *c, int remote,
+                                     union socket_address *sa) {
+  (void) c;
+  (void) remote;
+  (void) sa;
+}
+
+#define MG_NULL_IFACE_VTABLE                                                   \
+  {                                                                            \
+    mg_null_if_init, mg_null_if_free, mg_null_if_add_conn,                     \
+        mg_null_if_remove_conn, mg_null_if_poll, mg_null_if_listen_tcp,        \
+        mg_null_if_listen_udp, mg_null_if_connect_tcp, mg_null_if_connect_udp, \
+        mg_null_if_tcp_send, mg_null_if_udp_send, mg_null_if_tcp_recv,         \
+        mg_null_if_udp_recv, mg_null_if_create_conn, mg_null_if_destroy_conn,  \
+        mg_null_if_sock_set, mg_null_if_get_conn_addr,                         \
+  }
+
+const struct mg_iface_vtable mg_null_iface_vtable = MG_NULL_IFACE_VTABLE;
+
+#if MG_NET_IF == MG_NET_IF_NULL
+const struct mg_iface_vtable mg_default_iface_vtable = MG_NULL_IFACE_VTABLE;
+#endif /* MG_NET_IF == MG_NET_IF_NULL */
+#ifdef MG_MODULE_LINES
 #line 1 "mongoose/src/mg_net_if_socket.c"
 #endif
 /*

mongoose.h

@@ -105,6 +105,7 @@
 #define MG_NET_IF_SIMPLELINK 2
 #define MG_NET_IF_LWIP_LOW_LEVEL 3
 #define MG_NET_IF_PIC32 4
+#define MG_NET_IF_NULL 5
 
 #define MG_SSL_IF_OPENSSL 1
 #define MG_SSL_IF_MBEDTLS 2

src/common/platform.h

@@ -69,6 +69,7 @@
 #define MG_NET_IF_SIMPLELINK 2
 #define MG_NET_IF_LWIP_LOW_LEVEL 3
 #define MG_NET_IF_PIC32 4
+#define MG_NET_IF_NULL 5
 
 #define MG_SSL_IF_OPENSSL 1
 #define MG_SSL_IF_MBEDTLS 2

src/mg_modules.mk

@@ -64,6 +64,7 @@ SOURCES = $(COMMON)/mg_mem.h \
           mg_net_if_socket.h \
           mg_net_if_socks.h \
           mg_net_if.c \
+          mg_net_if_null.c \
           mg_net_if_socket.c \
           mg_net_if_socks.c \
           mg_ssl_if_openssl.c \

src/mg_net_if_null.c

+/*
+ * Copyright (c) 2018 Cesanta Software Limited
+ * All rights reserved
+ *
+ * This software is dual-licensed: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation. For the terms of this
+ * license, see <http://www.gnu.org/licenses/>.
+ *
+ * You are free to use this software under the terms of the GNU General
+ * Public License, but WITHOUT ANY WARRANTY; without even the implied
+ * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ * See the GNU General Public License for more details.
+ *
+ * Alternatively, you can license this software under a commercial
+ * license, as set out in <https://www.cesanta.com/license>.
+ */
+
+static void mg_null_if_connect_tcp(struct mg_connection *c,
+                                   const union socket_address *sa) {
+  c->flags |= MG_F_CLOSE_IMMEDIATELY;
+  (void) sa;
+}
+
+static void mg_null_if_connect_udp(struct mg_connection *c) {
+  c->flags |= MG_F_CLOSE_IMMEDIATELY;
+}
+
+static int mg_null_if_listen_tcp(struct mg_connection *c,
+                                 union socket_address *sa) {
+  (void) c;
+  (void) sa;
+  return -1;
+}
+
+static int mg_null_if_listen_udp(struct mg_connection *c,
+                                 union socket_address *sa) {
+  (void) c;
+  (void) sa;
+  return -1;
+}
+
+static int mg_null_if_tcp_send(struct mg_connection *c, const void *buf,
+                               size_t len) {
+  (void) c;
+  (void) buf;
+  (void) len;
+  return -1;
+}
+
+static int mg_null_if_udp_send(struct mg_connection *c, const void *buf,
+                               size_t len) {
+  (void) c;
+  (void) buf;
+  (void) len;
+  return -1;
+}
+
+int mg_null_if_tcp_recv(struct mg_connection *c, void *buf, size_t len) {
+  (void) c;
+  (void) buf;
+  (void) len;
+  return -1;
+}
+
+int mg_null_if_udp_recv(struct mg_connection *c, void *buf, size_t len,
+                        union socket_address *sa, size_t *sa_len) {
+  (void) c;
+  (void) buf;
+  (void) len;
+  (void) sa;
+  (void) sa_len;
+  return -1;
+}
+
+static int mg_null_if_create_conn(struct mg_connection *c) {
+  (void) c;
+  return -1;
+}
+
+static void mg_null_if_destroy_conn(struct mg_connection *c) {
+  (void) c;
+}
+
+static void mg_null_if_sock_set(struct mg_connection *c, sock_t sock) {
+  (void) c;
+  (void) sock;
+}
+
+static void mg_null_if_init(struct mg_iface *iface) {
+  (void) iface;
+}
+
+static void mg_null_if_free(struct mg_iface *iface) {
+  (void) iface;
+}
+
+static void mg_null_if_add_conn(struct mg_connection *c) {
+  c->sock = INVALID_SOCKET;
+  c->flags |= MG_F_CLOSE_IMMEDIATELY;
+}
+
+static void mg_null_if_remove_conn(struct mg_connection *c) {
+  (void) c;
+}
+
+static time_t mg_null_if_poll(struct mg_iface *iface, int timeout_ms) {
+  struct mg_mgr *mgr = iface->mgr;
+  struct mg_connection *nc, *tmp;
+  double now = mg_time();
+  /* We basically just run timers and poll. */
+  for (nc = mgr->active_connections; nc != NULL; nc = tmp) {
+    tmp = nc->next;
+    mg_if_poll(nc, now);
+  }
+  (void) timeout_ms;
+  return (time_t) now;
+}
+
+static void mg_null_if_get_conn_addr(struct mg_connection *c, int remote,
+                                     union socket_address *sa) {
+  (void) c;
+  (void) remote;
+  (void) sa;
+}
+
+#define MG_NULL_IFACE_VTABLE                                                   \
+  {                                                                            \
+    mg_null_if_init, mg_null_if_free, mg_null_if_add_conn,                     \
+        mg_null_if_remove_conn, mg_null_if_poll, mg_null_if_listen_tcp,        \
+        mg_null_if_listen_udp, mg_null_if_connect_tcp, mg_null_if_connect_udp, \
+        mg_null_if_tcp_send, mg_null_if_udp_send, mg_null_if_tcp_recv,         \
+        mg_null_if_udp_recv, mg_null_if_create_conn, mg_null_if_destroy_conn,  \
+        mg_null_if_sock_set, mg_null_if_get_conn_addr,                         \
+  }
+
+const struct mg_iface_vtable mg_null_iface_vtable = MG_NULL_IFACE_VTABLE;
+
+#if MG_NET_IF == MG_NET_IF_NULL
+const struct mg_iface_vtable mg_default_iface_vtable = MG_NULL_IFACE_VTABLE;
+#endif /* MG_NET_IF == MG_NET_IF_NULL */