Add TLS support

tutorials/websocket/websocket-client/Makefile

@@ -3,6 +3,7 @@ DELETE = rm -rf                   # Command to remove files
 OUT ?= -o $(PROG)                 # Compiler argument for output file
 SOURCES = main.c mongoose.c       # Source code files
 CFLAGS = -W -Wall -Wextra -g -I.  # Build options
+CFLAGS_MONGOOSE ?= -DMG_TLS=MG_TLS_BUILTIN
 
 # Mongoose build options. See https://mongoose.ws/documentation/#build-options
 #CFLAGS_MONGOOSE += -DMG_ENABLE_LINES

tutorials/websocket/websocket-client/main.c

@@ -8,11 +8,16 @@
 #include "mongoose.h"
 
 static const char *s_url = "ws://localhost:8000/websocket";
+static const char *s_ca_path = "ca.pem";
 
 // Print websocket response and signal that we're done
 static void fn(struct mg_connection *c, int ev, void *ev_data) {
   if (ev == MG_EV_OPEN) {
     c->is_hexdumping = 1;
+  } else if (ev == MG_EV_CONNECT && mg_url_is_ssl(s_url)) {
+    struct mg_str ca = mg_file_read(&mg_fs_posix, s_ca_path);
+    struct mg_tls_opts opts = {.ca = ca, .name = mg_url_host(s_url)};
+    mg_tls_init(c, &opts);
   } else if (ev == MG_EV_ERROR) {
     // On error, log error message
     MG_ERROR(("%p %s", c->fd, (char *) ev_data));
@@ -30,13 +35,31 @@ static void fn(struct mg_connection *c, int ev, void *ev_data) {
   }
 }
 
-int main(void) {
+int main(int argc, char *argv[]) {
   struct mg_mgr mgr;        // Event manager
   bool done = false;        // Event handler flips it to true
   struct mg_connection *c;  // Client connection
-  mg_mgr_init(&mgr);        // Initialise event manager
-  mg_log_set(MG_LL_DEBUG);  // Set log level
-  c = mg_ws_connect(&mgr, s_url, fn, &done, NULL);     // Create client
+  int i;
+
+  // Parse command-line flags
+  for (i = 1; i < argc; i++) {
+    if (strcmp(argv[i], "-url") == 0 && argv[i + 1] != NULL) {
+      s_url = argv[++i];
+    } else if (strcmp(argv[i], "-ca") == 0 && argv[i + 1] != NULL) {
+      s_ca_path = argv[++i];
+    } else {
+      printf(
+          "Usage: %s OPTIONS\n"
+          "  -ca PATH  - Path to the CA file, default: '%s'\n"
+          "  -url URL  - Destination URL, default: '%s'\n",
+          argv[0], s_ca_path, s_url);
+      return 1;
+    }
+  }
+
+  mg_mgr_init(&mgr);                                // Initialise event manager
+  mg_log_set(MG_LL_DEBUG);                          // Set log level
+  c = mg_ws_connect(&mgr, s_url, fn, &done, NULL);  // Create client
   while (c && done == false) mg_mgr_poll(&mgr, 1000);  // Wait for echo
   mg_mgr_free(&mgr);                                   // Deallocate resources
   return 0;