1 files changed, 106 insertions, 0 deletions
diff --git a/lib/libssh.c b/lib/libssh.c
new file mode 100644
index 00000000..9449ab30
--- /dev/null
+++ b/lib/libssh.c
@@ -0,0 +1,106 @@
+/*
+ *	BIRD -- Mockup of SSH Library for loading LibSSH using dlopen
+ *
+ *	(c) 2015 CZ.NIC
+ *
+ *	This file was part of SSH Library: http://www.libssh.org/
+ *	(c) 2003-2009 by Aris Adamantiadis (SSH Library)
+ *
+ *	Can be freely distributed and used under the terms of the GNU GPL.
+ */
+
+#include <dlfcn.h>
+#include "nest/bird.h"
+#include "lib/libssh.h"
+
+#define FILENAME_OF_SHARED_OBJECT_LIBSSH "libssh.so"
+
+struct ssh_function {
+  void **fn;
+  const char *name;
+};
+
+ssh_session (*ssh_new)(void);
+void (*ssh_set_blocking)(ssh_session session, int blocking);
+int (*ssh_options_set)(ssh_session session, enum ssh_options_e type, const void *value);
+int (*ssh_connect)(ssh_session session);
+socket_t (*ssh_get_fd)(ssh_session session);
+int (*ssh_is_server_known)(ssh_session session);
+int (*ssh_userauth_publickey_auto)(ssh_session session, const char *username, const char *passphrase);
+const char * (*ssh_get_error)(void *error);
+int (*ssh_get_error_code)(void *error);
+void (*ssh_disconnect)(ssh_session session);
+void (*ssh_free)(ssh_session session);
+
+ssh_channel (*ssh_channel_new)(ssh_session session);
+int (*ssh_channel_is_open)(ssh_channel channel);
+int (*ssh_channel_close)(ssh_channel channel);
+void (*ssh_channel_free)(ssh_channel channel);
+int (*ssh_channel_open_session)(ssh_channel channel);
+int (*ssh_channel_request_subsystem)(ssh_channel channel, const char *subsystem);
+int (*ssh_channel_read_nonblocking)(ssh_channel channel, void *dest, uint32_t count, int is_stderr);
+int (*ssh_channel_is_eof)(ssh_channel channel);
+int (*ssh_channel_select)(ssh_channel *readchans, ssh_channel *writechans, ssh_channel *exceptchans, struct timeval * timeout);
+int (*ssh_channel_write)(ssh_channel channel, const void *data, uint32_t len);
+
+#define SSH_FN(x) { .fn = (void **) &x, .name = #x }
+static struct ssh_function all_ssh_fn[] = {
+    SSH_FN(ssh_new),
+    SSH_FN(ssh_set_blocking),
+    SSH_FN(ssh_options_set),
+    SSH_FN(ssh_connect),
+    SSH_FN(ssh_get_fd),
+    SSH_FN(ssh_is_server_known),
+    SSH_FN(ssh_userauth_publickey_auto),
+    SSH_FN(ssh_get_error),
+    SSH_FN(ssh_get_error_code),
+    SSH_FN(ssh_disconnect),
+    SSH_FN(ssh_free),
+    SSH_FN(ssh_channel_new),
+    SSH_FN(ssh_channel_is_open),
+    SSH_FN(ssh_channel_close),
+    SSH_FN(ssh_channel_free),
+    SSH_FN(ssh_channel_open_session),
+    SSH_FN(ssh_channel_request_subsystem),
+    SSH_FN(ssh_channel_read_nonblocking),
+    SSH_FN(ssh_channel_is_eof),
+    SSH_FN(ssh_channel_select),
+    SSH_FN(ssh_channel_write),
+};
+#undef SSH_FN
+
+static void *libssh;
+
+/**
+ * load_libssh - Prepare all ssh_* functions
+ *
+ * Initialize for use all ssh_* functions. Returns normally NULL.
+ * If an error occurs then returns static string with the error description.
+ */
+const char *
+load_libssh(void)
+{
+  char *err_buf;
+
+  libssh = dlopen(FILENAME_OF_SHARED_OBJECT_LIBSSH, RTLD_LAZY);
+  if (!libssh)
+  {
+    /* This would be probably often repeated problem */
+    char *help_msg = "You have to install libssh library.";
+    err_buf = mb_alloc(&root_pool, 512); /* FIXME: free memory */
+    bsnprintf(err_buf, 512, "%s. %s", dlerror(), help_msg);
+    return err_buf;
+  }
+
+  dlerror(); /* Clear any existing error */
+
+  for (int i = 0; i < sizeof(all_ssh_fn)/sizeof(all_ssh_fn[0]); i++)
+  {
+    *all_ssh_fn[i].fn = (void *) dlsym(libssh, all_ssh_fn[i].name);
+    err_buf = dlerror();
+    if (err_buf)
+      return err_buf;
+  }
+
+  return NULL;
+}