1 files changed, 138 insertions, 0 deletions
diff --git a/libpam/pam_dynamic.c b/libpam/pam_dynamic.c
new file mode 100644
index 0000000..c063083
--- /dev/null
+++ b/libpam/pam_dynamic.c
@@ -0,0 +1,138 @@
+/*
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, and the entire permission notice in its entirety,
+ *    including the disclaimer of warranties.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote
+ *    products derived from this software without specific prior
+ *    written permission.
+ *
+ * ALTERNATIVELY, this product may be distributed under the terms of
+ * the GNU Public License, in which case the provisions of the GPL are
+ * required INSTEAD OF the above restrictions.  (This clause is
+ * necessary due to a potential bad interaction between the GPL and
+ * the restrictions contained in a BSD-style copyright.)
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
+ * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "pam_private.h"
+
+#ifdef PAM_SHL
+# include <dl.h>
+#elif defined(PAM_DYLD)
+# include <mach-o/dyld.h>
+#else /* PAM_SHL */
+# include <dlfcn.h>
+#endif /* PAM_SHL */
+
+#ifndef SHLIB_SYM_PREFIX
+#define SHLIB_SYM_PREFIX "_"
+#endif
+
+void *_pam_dlopen(const char *mod_path)
+{
+#ifdef PAM_SHL
+	return shl_load(mod_path, BIND_IMMEDIATE, 0L);
+#elif defined(PAM_DYLD)
+	NSObjectFileImage ofile;
+	void *ret = NULL;
+
+	if (NSCreateObjectFileImageFromFile(mod_path, &ofile) !=
+			NSObjectFileImageSuccess )
+		return NULL;
+
+	ret = NSLinkModule(ofile, mod_path, NSLINKMODULE_OPTION_PRIVATE | NSLINKMODULE_OPTION_BINDNOW);
+	NSDestroyObjectFileImage(ofile);
+
+	return ret;
+#else
+	return dlopen(mod_path, RTLD_NOW);
+#endif
+}
+
+servicefn _pam_dlsym(void *handle, const char *symbol)
+{
+#ifdef PAM_SHL
+	char *_symbol = NULL;
+	servicefn ret;
+
+	if( symbol == NULL )
+		return NULL;
+
+	if( shl_findsym(&handle, symbol, (short) TYPE_PROCEDURE, &ret ){
+		_symbol = malloc( strlen(symbol) + sizeof(SHLIB_SYM_PREFIX) + 1 );
+		if( _symbol == NULL )
+			return NULL;
+		strcpy(_symbol, SHLIB_SYM_PREFIX);
+		strcat(_symbol, symbol);
+		if( shl_findsym(&handle, _symbol,
+				(short) TYPE_PROCEDURE, &ret ){
+			free(_symbol);
+			return NULL;
+		}
+		free(_symbol);
+	}
+
+	return ret;
+
+#elif defined(PAM_DYLD)
+	NSSymbol nsSymbol;
+	char *_symbol;
+
+	if( symbol == NULL )
+		return NULL;
+	_symbol = malloc( strlen(symbol) + 2 );
+	if( _symbol == NULL )
+		return NULL;
+	strcpy(_symbol, SHLIB_SYM_PREFIX);
+	strcat(_symbol, symbol);
+
+	nsSymbol = NSLookupSymbolInModule(handle, _symbol);
+	if( nsSymbol == NULL )
+		return NULL;
+	free(_symbol);
+
+	return (servicefn)NSAddressOfSymbol(nsSymbol);
+#else
+	return (servicefn) dlsym(handle, symbol);
+#endif
+}
+
+void _pam_dlclose(void *handle)
+{
+#ifdef PAM_SHL
+	shl_unload(handle);
+#elif defined(PAM_DYLD)
+	NSUnLinkModule((NSModule)handle, NSUNLINKMODULE_OPTION_NONE);
+#else
+	dlclose(handle);
+#endif
+
+	return;
+}
+
+const char *
+_pam_dlerror (void)
+{
+#if defined(PAM_SHL) || defined(PAM_DYLD)
+        return "unknown";
+#else
+        return dlerror ();
+#endif
+}