GUACAMOLE-221: Migrate telnet handling of "argv" to guac_argv_*() convenience API.

src/protocols/telnet/argv.c

@@ -29,127 +29,27 @@
 #include <stdlib.h>
 #include <string.h>
 
-/**
+int guac_telnet_argv_callback(guac_user* user, const char* mimetype,
- * All telnet connection settings which may be updated by unprivileged users
+        const char* name, const char* value, void* data) {
- * through "argv" streams.
- */
-typedef enum guac_telnet_argv_setting {
-
-    /**
-     * The color scheme of the terminal.
-     */
-    GUAC_TELNET_ARGV_SETTING_COLOR_SCHEME,
-
-    /**
-     * The name of the font family used by the terminal.
-     */
-    GUAC_TELNET_ARGV_SETTING_FONT_NAME,
-
-    /**
-     * The size of the font used by the terminal, in points.
-     */
-    GUAC_TELNET_ARGV_SETTING_FONT_SIZE
-
-} guac_telnet_argv_setting;
-
-/**
- * The value or current status of a connection parameter received over an
- * "argv" stream.
- */
-typedef struct guac_telnet_argv {
-
-    /**
-     * The specific setting being updated.
-     */
-    guac_telnet_argv_setting setting;
-
-    /**
-     * Buffer space for containing the received argument value.
-     */
-    char buffer[GUAC_TELNET_ARGV_MAX_LENGTH];
-
-    /**
-     * The number of bytes received so far.
-     */
-    int length;
-
-} guac_telnet_argv;
-
-/**
- * Handler for "blob" instructions which appends the data from received blobs
- * to the end of the in-progress argument value buffer.
- *
- * @see guac_user_blob_handler
- */
-static int guac_telnet_argv_blob_handler(guac_user* user,
-        guac_stream* stream, void* data, int length) {
-
-    guac_telnet_argv* argv = (guac_telnet_argv*) stream->data;
-
-    /* Calculate buffer size remaining, including space for null terminator,
-     * adjusting received length accordingly */
-    int remaining = sizeof(argv->buffer) - argv->length - 1;
-    if (length > remaining)
-        length = remaining;
-
-    /* Append received data to end of buffer */
-    memcpy(argv->buffer + argv->length, data, length);
-    argv->length += length;
-
-    return 0;
-
-}
-
-/**
- * Handler for "end" instructions which applies the changes specified by the
- * argument value buffer associated with the stream.
- *
- * @see guac_user_end_handler
- */
-static int guac_telnet_argv_end_handler(guac_user* user,
-        guac_stream* stream) {
-
-    int size;
 
     guac_client* client = user->client;
     guac_telnet_client* telnet_client = (guac_telnet_client*) client->data;
     guac_terminal* terminal = telnet_client->term;
 
-    /* Append null terminator to value */
-    guac_telnet_argv* argv = (guac_telnet_argv*) stream->data;
-    argv->buffer[argv->length] = '\0';
-
-    /* Apply changes to chosen setting */
-    switch (argv->setting) {
-
     /* Update color scheme */
-        case GUAC_TELNET_ARGV_SETTING_COLOR_SCHEME:
+    if (strcmp(name, GUAC_TELNET_ARGV_COLOR_SCHEME) == 0)
-            guac_terminal_apply_color_scheme(terminal, argv->buffer);
+        guac_terminal_apply_color_scheme(terminal, value);
-            guac_client_stream_argv(client, client->socket, "text/plain",
-                    "color-scheme", argv->buffer);
-            break;
 
     /* Update font name */
-        case GUAC_TELNET_ARGV_SETTING_FONT_NAME:
+    else if (strcmp(name, GUAC_TELNET_ARGV_FONT_NAME) == 0)
-            guac_terminal_apply_font(terminal, argv->buffer, -1, 0);
+        guac_terminal_apply_font(terminal, value, -1, 0);
-            guac_client_stream_argv(client, client->socket, "text/plain",
-                    "font-name", argv->buffer);
-            break;
-
-        /* Update font size */
-        case GUAC_TELNET_ARGV_SETTING_FONT_SIZE:
 
     /* Update only if font size is sane */
-            size = atoi(argv->buffer);
+    else if (strcmp(name, GUAC_TELNET_ARGV_FONT_SIZE) == 0) {
-            if (size > 0) {
+        int size = atoi(value);
+        if (size > 0)
             guac_terminal_apply_font(terminal, NULL, size,
                     telnet_client->settings->resolution);
-                guac_client_stream_argv(client, client->socket, "text/plain",
-                        "font-size", argv->buffer);
-            }
-
-            break;
-
     }
 
     /* Update terminal window size if connected */
@@ -157,45 +57,6 @@ static int guac_telnet_argv_end_handler(guac_user* user,
         guac_telnet_send_naws(telnet_client->telnet, terminal->term_width,
                 terminal->term_height);
 
-    free(argv);
-    return 0;
-
-}
-
-int guac_telnet_argv_handler(guac_user* user, guac_stream* stream,
-        char* mimetype, char* name) {
-
-    guac_telnet_argv_setting setting;
-
-    /* Allow users to update the color scheme and font details */
-    if (strcmp(name, "color-scheme") == 0)
-        setting = GUAC_TELNET_ARGV_SETTING_COLOR_SCHEME;
-    else if (strcmp(name, "font-name") == 0)
-        setting = GUAC_TELNET_ARGV_SETTING_FONT_NAME;
-    else if (strcmp(name, "font-size") == 0)
-        setting = GUAC_TELNET_ARGV_SETTING_FONT_SIZE;
-
-    /* No other connection parameters may be updated */
-    else {
-        guac_protocol_send_ack(user->socket, stream, "Not allowed.",
-                GUAC_PROTOCOL_STATUS_CLIENT_FORBIDDEN);
-        guac_socket_flush(user->socket);
-        return 0;
-    }
-
-    guac_telnet_argv* argv = malloc(sizeof(guac_telnet_argv));
-    argv->setting = setting;
-    argv->length = 0;
-
-    /* Prepare stream to receive argument value */
-    stream->blob_handler = guac_telnet_argv_blob_handler;
-    stream->end_handler = guac_telnet_argv_end_handler;
-    stream->data = argv;
-
-    /* Signal stream is ready */
-    guac_protocol_send_ack(user->socket, stream, "Ready for updated "
-            "parameter.", GUAC_PROTOCOL_STATUS_SUCCESS);
-    guac_socket_flush(user->socket);
     return 0;
 
 }
@@ -206,18 +67,18 @@ void* guac_telnet_send_current_argv(guac_user* user, void* data) {
     guac_terminal* terminal = telnet_client->term;
 
     /* Send current color scheme */
-    guac_user_stream_argv(user, user->socket, "text/plain", "color-scheme",
+    guac_user_stream_argv(user, user->socket, "text/plain",
-            terminal->color_scheme);
+            GUAC_TELNET_ARGV_COLOR_SCHEME, terminal->color_scheme);
 
     /* Send current font name */
-    guac_user_stream_argv(user, user->socket, "text/plain", "font-name",
+    guac_user_stream_argv(user, user->socket, "text/plain",
-            terminal->font_name);
+            GUAC_TELNET_ARGV_FONT_NAME, terminal->font_name);
 
     /* Send current font size */
     char font_size[64];
     sprintf(font_size, "%i", terminal->font_size);
-    guac_user_stream_argv(user, user->socket, "text/plain", "font-size",
+    guac_user_stream_argv(user, user->socket, "text/plain",
-            font_size);
+            GUAC_TELNET_ARGV_FONT_SIZE, font_size);
 
     return NULL;
 

src/protocols/telnet/argv.h

@@ -23,19 +23,32 @@
 
 #include "config.h"
 
+#include <guacamole/argv.h>
 #include <guacamole/user.h>
 
 /**
- * The maximum number of bytes to allow for any argument value received via an
+ * The name of the parameter that specifies/updates the color scheme used by
- * argv stream, including null terminator.
+ * the terminal emulator.
  */
-#define GUAC_TELNET_ARGV_MAX_LENGTH 16384
+#define GUAC_TELNET_ARGV_COLOR_SCHEME "color-scheme"
 
 /**
- * Handles an incoming stream from a Guacamole "argv" instruction, updating the
+ * The name of the parameter that specifies/updates the name of the font used
- * given connection parameter if that parameter is allowed to be updated.
+ * by the terminal emulator.
  */
-guac_user_argv_handler guac_telnet_argv_handler;
+#define GUAC_TELNET_ARGV_FONT_NAME "font-name"
+
+/**
+ * The name of the parameter that specifies/updates the font size used by the
+ * terminal emulator.
+ */
+#define GUAC_TELNET_ARGV_FONT_SIZE "font-size"
+
+/**
+ * Handles a received argument value from a Guacamole "argv" instruction,
+ * updating the given connection parameter.
+ */
+guac_argv_callback guac_telnet_argv_callback;
 
 /**
  * Sends the current values of all non-sensitive parameters which may be set

src/protocols/telnet/client.c

@@ -18,6 +18,7 @@
  */
 
 #include "config.h"
+#include "argv.h"
 #include "client.h"
 #include "common/recording.h"
 #include "settings.h"
@@ -31,6 +32,7 @@
 #include <stdlib.h>
 #include <string.h>
 
+#include <guacamole/argv.h>
 #include <guacamole/client.h>
 
 int guac_client_init(guac_client* client) {
@@ -54,6 +56,11 @@ int guac_client_init(guac_client* client) {
     client->join_handler = guac_telnet_user_join_handler;
     client->free_handler = guac_telnet_client_free_handler;
 
+    /* Register handlers for argument values that may be sent after the handshake */
+    guac_argv_register(GUAC_TELNET_ARGV_COLOR_SCHEME, guac_telnet_argv_callback, NULL, GUAC_ARGV_OPTION_ECHO);
+    guac_argv_register(GUAC_TELNET_ARGV_FONT_NAME, guac_telnet_argv_callback, NULL, GUAC_ARGV_OPTION_ECHO);
+    guac_argv_register(GUAC_TELNET_ARGV_FONT_SIZE, guac_telnet_argv_callback, NULL, GUAC_ARGV_OPTION_ECHO);
+
     /* Set locale and warn if not UTF-8 */
     setlocale(LC_CTYPE, "");
     if (strcmp(nl_langinfo(CODESET), "UTF-8") != 0) {

src/protocols/telnet/settings.c

@@ -19,6 +19,7 @@
 
 #include "config.h"
 
+#include "argv.h"
 #include "common/defaults.h"
 #include "settings.h"
 
@@ -39,9 +40,9 @@ const char* GUAC_TELNET_CLIENT_ARGS[] = {
     "username-regex",
     "password",
     "password-regex",
-    "font-name",
+    GUAC_TELNET_ARGV_FONT_NAME,
-    "font-size",
+    GUAC_TELNET_ARGV_FONT_SIZE,
-    "color-scheme",
+    GUAC_TELNET_ARGV_COLOR_SCHEME,
     "typescript-path",
     "typescript-name",
     "create-typescript-path",

src/protocols/telnet/user.c

@@ -92,7 +92,7 @@ int guac_telnet_user_join_handler(guac_user* user, int argc, char** argv) {
         user->pipe_handler = guac_telnet_pipe_handler;
 
         /* Updates to connection parameters */
-        user->argv_handler = guac_telnet_argv_handler;
+        user->argv_handler = guac_argv_handler;
 
         /* Display size change events */
         user->size_handler = guac_telnet_user_size_handler;