GUACAMOLE-377: Add libguac "guac_display" API for easy and efficient rendering.

.gitignore

@@ -48,3 +48,7 @@ doc/*/doxygen-output
 
 # IDE metadata
 nbproject/
+
+# Compilation database, as may be generated by tools like Bear
+.cache/
+compile_commands.json

configure.ac

@@ -44,9 +44,14 @@ PKG_PROG_PKG_CONFIG()
 AC_CHECK_HEADERS([fcntl.h stdlib.h string.h sys/socket.h time.h sys/time.h syslog.h unistd.h cairo/cairo.h pngstruct.h])
 
 # Source characteristics
+AC_DEFINE([_GNU_SOURCE],   [1], [Uses GNU-specific APIs (if available)])
 AC_DEFINE([_XOPEN_SOURCE], [700], [Uses X/Open and POSIX APIs])
 AC_DEFINE([__BSD_VISIBLE], [1], [Uses BSD-specific APIs (if available)])
 
+# Check for availability of non-portable sched_getaffinity() function (one of
+# several possible routes for determining the number of available processors)
+AC_CHECK_FUNCS([sched_getaffinity])
+
 # Check for whether math library is required
 AC_CHECK_LIB([m], [cos],
              [MATH_LIBS=-lm],

src/common-ssh/key.c

@@ -132,18 +132,25 @@ guac_common_ssh_key* guac_common_ssh_key_alloc(char* data, int length,
      * different key algorithms) we need to perform a heuristic here to check
      * if a passphrase is needed. This could allow junk keys through that
      * would never be able to auth. libssh2 should display errors to help
-     * admins track down malformed keys and delete or replace them.
-     */
+     * admins track down malformed keys and delete or replace them. */
 
     if (is_passphrase_needed(data, length) && (passphrase == NULL || *passphrase == '\0'))
         return NULL;
 
     guac_common_ssh_key* key = guac_mem_alloc(sizeof(guac_common_ssh_key));
 
+    /* NOTE: Older versions of libssh2 will at times ignore the declared key
+     * length and instead recalculate the length using strlen(). This has since
+     * been fixed, but as of this writing the fix has not yet been released.
+     * Below, we add our own null terminator to ensure that such calls to
+     * strlen() will work without issue. We can remove this workaround once
+     * copies of libssh2 that use strlen() on key data are not in common use. */
+
     /* Copy private key to structure */
     key->private_key_length = length;
-    key->private_key = guac_mem_alloc(length);
+    key->private_key = guac_mem_alloc(guac_mem_ckd_add_or_die(length, 1)); /* Extra byte added here for null terminator (see above) */
     memcpy(key->private_key, data, length);
+    key->private_key[length] = '\0'; /* Manually-added null terminator (see above) */
     key->passphrase = guac_strdup(passphrase);
 
     return key;

src/common/Makefile.am

@@ -35,7 +35,6 @@ noinst_HEADERS =            \
     common/clipboard.h      \
     common/cursor.h         \
     common/defaults.h       \
-    common/display.h        \
     common/dot_cursor.h     \
     common/ibar_cursor.h    \
     common/iconv.h          \
@@ -51,7 +50,6 @@ libguac_common_la_SOURCES = \
     blank_cursor.c          \
     clipboard.c             \
     cursor.c                \
-    display.c               \
     dot_cursor.c            \
     ibar_cursor.c           \
     iconv.c                 \