all: remove the vla usage

CMakeLists.txt

@@ -17,7 +17,7 @@ if(GIT_FOUND)
     endif()
 endif()
 
-set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -D_GNU_SOURCE")
+set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -D_GNU_SOURCE -Wvla")
 if(CMAKE_VERSION VERSION_LESS "3.1")
     if ("${CMAKE_C_COMPILER_ID}" STREQUAL "GNU")
         set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -std=gnu99")

src/http.c

@@ -18,8 +18,7 @@ static size_t html_cache_len = 0;
 static int check_auth(struct lws *wsi, struct pss_http *pss) {
   if (server->credential == NULL) return AUTH_OK;
 
-  int hdr_length = lws_hdr_total_length(wsi, WSI_TOKEN_HTTP_AUTHORIZATION);
-  char buf[hdr_length + 1];
+  char buf[256];
   int len = lws_hdr_copy(wsi, buf, sizeof(buf), WSI_TOKEN_HTTP_AUTHORIZATION);
   if (len > 0) {
     // extract base64 text from authorization header
@@ -59,8 +58,7 @@ static int check_auth(struct lws *wsi, struct pss_http *pss) {
 }
 
 static bool accept_gzip(struct lws *wsi) {
-  int hdr_length = lws_hdr_total_length(wsi, WSI_TOKEN_HTTP_ACCEPT_ENCODING);
-  char buf[hdr_length + 1];
+  char buf[256];
   int len = lws_hdr_copy(wsi, buf, sizeof(buf), WSI_TOKEN_HTTP_ACCEPT_ENCODING);
   return len > 0 && strstr(buf, "gzip") != NULL;
 }

src/protocol.c

@@ -50,8 +50,7 @@ static json_object* parse_window_size(const char *buf, size_t len, uint16_t *col
 }
 
 static bool check_host_origin(struct lws *wsi) {
-  int origin_length = lws_hdr_total_length(wsi, WSI_TOKEN_ORIGIN);
-  char buf[origin_length + 1];
+  char buf[256];
   memset(buf, 0, sizeof(buf));
   int len = lws_hdr_copy(wsi, buf, (int) sizeof(buf), WSI_TOKEN_ORIGIN);
   if (len <= 0) {
@@ -67,9 +66,7 @@ static bool check_host_origin(struct lws *wsi) {
     sprintf(buf, "%s:%d", address, port);
   }
 
-  int host_length = lws_hdr_total_length(wsi, WSI_TOKEN_HOST);
-  if (host_length != strlen(buf)) return false;
-  char host_buf[host_length + 1];
+  char host_buf[256];
   memset(host_buf, 0, sizeof(host_buf));
   len = lws_hdr_copy(wsi, host_buf, (int) sizeof(host_buf), WSI_TOKEN_HOST);
 
@@ -100,7 +97,7 @@ static void process_exit_cb(void *ctx, pty_process *process) {
 
 static bool spawn_process(struct pss_tty *pss, uint16_t columns, uint16_t rows) {
   // append url args to arguments
-  char *argv[server->argc + pss->argc + 1];
+  char **argv = xmalloc((server->argc + pss->argc + 1) * sizeof(char *));
   int i, n = 0;
   for (i = 0; i < server->argc; i++) {
     argv[n++] = server->argv[i];
@@ -127,8 +124,8 @@ static bool spawn_process(struct pss_tty *pss, uint16_t columns, uint16_t rows)
 
 static void wsi_output(struct lws *wsi, pty_buf_t *buf) {
   if (buf == NULL) return;
-  char message[LWS_PRE + 1 + buf->len];
-  char *ptr= &message[LWS_PRE];
+  char *message = xmalloc(LWS_PRE + 1 + buf->len);
+  char *ptr= message + LWS_PRE;
 
   *ptr = OUTPUT;
   memcpy(ptr + 1, buf->base, buf->len);
@@ -137,6 +134,8 @@ static void wsi_output(struct lws *wsi, pty_buf_t *buf) {
   if (lws_write(wsi, (unsigned char *) ptr, n, LWS_WRITE_BINARY) < n) {
     lwsl_err("write OUTPUT to WS\n");
   }
+
+  free(message);
 }
 
 int callback_tty(struct lws *wsi, enum lws_callback_reasons reason, void *user, void *in,

src/pty.c

@@ -117,6 +117,7 @@ void process_free(pty_process *process) {
   uv_thread_join(&process->tid);
 #endif
   if (process->io != NULL) pty_io_free(process->io);
+  if (process->argv != NULL) free(process->argv);
   free(process);
 }
 

src/server.c

@@ -578,19 +578,20 @@ int main(int argc, char **argv) {
   }
 
 #if LWS_LIBRARY_VERSION_MAJOR >= 3
+  #define sig_count 2
   int sig_nums[] = {SIGINT, SIGTERM};
-  int ns = sizeof(sig_nums) / sizeof(sig_nums[0]);
-  uv_signal_t signals[ns];
-  for (int i = 0; i < ns; i++) {
+  uv_signal_t signals[sig_count];
+  for (int i = 0; i < sig_count; i++) {
     uv_signal_init(server->loop, &signals[i]);
     uv_signal_start(&signals[i], signal_cb, sig_nums[i]);
   }
 
   lws_service(context, 0);
 
-  for (int i = 0; i < ns; i++) {
+  for (int i = 0; i < sig_count; i++) {
     uv_signal_stop(&signals[i]);
   }
+  #undef sig_count
 #else
 #if LWS_LIBRARY_VERSION_MAJOR < 2
   lws_uv_initloop(context, server->loop, signal_cb, 0);