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-rw-r--r--libpam/pam_dynamic.c142
1 files changed, 142 insertions, 0 deletions
diff --git a/libpam/pam_dynamic.c b/libpam/pam_dynamic.c
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+++ b/libpam/pam_dynamic.c
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+/*
+ * 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"
+
+#ifndef PAM_STATIC
+
+#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
+}
+
+#endif