--- /dev/null
+/*
+ * Copyright (c) 2012 Todd C. Miller <Todd.Miller@courtesan.com>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <config.h>
+
+#include <sys/types.h>
+#include <stdio.h>
+#ifdef STDC_HEADERS
+# include <stdlib.h>
+# include <stddef.h>
+#else
+# ifdef HAVE_STDLIB_H
+# include <stdlib.h>
+# endif
+#endif /* STDC_HEADERS */
+#ifdef HAVE_STRING_H
+# include <string.h>
+#endif /* HAVE_STRING_H */
+#ifdef HAVE_STRINGS_H
+# include <strings.h>
+#endif /* HAVE_STRINGS_H */
+#ifdef HAVE_UNISTD_H
+# include <unistd.h>
+#endif /* HAVE_UNISTD_H */
+
+#include "sudo.h"
+#include "sudo_plugin.h"
+#include "sudo_plugin_int.h"
+#include "sudo_debug.h"
+
+/* Singly linked hook list. */
+struct sudo_hook_list {
+ struct sudo_hook_list *next;
+ union {
+ sudo_hook_fn_t generic_fn;
+ sudo_hook_fn_setenv_t setenv_fn;
+ sudo_hook_fn_unsetenv_t unsetenv_fn;
+ sudo_hook_fn_getenv_t getenv_fn;
+ sudo_hook_fn_putenv_t putenv_fn;
+ } u;
+ void *closure;
+};
+
+/* Each hook type gets own hook list. */
+static struct sudo_hook_list *sudo_hook_setenv_list;
+static struct sudo_hook_list *sudo_hook_unsetenv_list;
+static struct sudo_hook_list *sudo_hook_getenv_list;
+static struct sudo_hook_list *sudo_hook_putenv_list;
+
+int
+process_hooks_setenv(const char *name, const char *value, int overwrite)
+{
+ struct sudo_hook_list *hook;
+ int rc = SUDO_HOOK_RET_NEXT;
+ debug_decl(process_hooks_setenv, SUDO_DEBUG_HOOKS)
+
+ /* First process the hooks. */
+ for (hook = sudo_hook_setenv_list; hook != NULL; hook = hook->next) {
+ rc = hook->u.setenv_fn(name, value, overwrite, hook->closure);
+ switch (rc) {
+ case SUDO_HOOK_RET_NEXT:
+ break;
+ case SUDO_HOOK_RET_ERROR:
+ case SUDO_HOOK_RET_STOP:
+ goto done;
+ default:
+ warningx("invalid setenv hook return value: %d", rc);
+ break;
+ }
+ }
+done:
+ debug_return_int(rc);
+}
+
+int
+process_hooks_putenv(char *string)
+{
+ struct sudo_hook_list *hook;
+ int rc = SUDO_HOOK_RET_NEXT;
+ debug_decl(process_hooks_putenv, SUDO_DEBUG_HOOKS)
+
+ /* First process the hooks. */
+ for (hook = sudo_hook_putenv_list; hook != NULL; hook = hook->next) {
+ rc = hook->u.putenv_fn(string, hook->closure);
+ switch (rc) {
+ case SUDO_HOOK_RET_NEXT:
+ break;
+ case SUDO_HOOK_RET_ERROR:
+ case SUDO_HOOK_RET_STOP:
+ goto done;
+ default:
+ warningx("invalid putenv hook return value: %d", rc);
+ break;
+ }
+ }
+done:
+ debug_return_int(rc);
+}
+
+int
+process_hooks_getenv(const char *name, char **value)
+{
+ struct sudo_hook_list *hook;
+ char *val = NULL;
+ int rc = SUDO_HOOK_RET_NEXT;
+ debug_decl(process_hooks_getenv, SUDO_DEBUG_HOOKS)
+
+ /* First process the hooks. */
+ for (hook = sudo_hook_getenv_list; hook != NULL; hook = hook->next) {
+ rc = hook->u.getenv_fn(name, &val, hook->closure);
+ switch (rc) {
+ case SUDO_HOOK_RET_NEXT:
+ break;
+ case SUDO_HOOK_RET_ERROR:
+ case SUDO_HOOK_RET_STOP:
+ goto done;
+ default:
+ warningx("invalid getenv hook return value: %d", rc);
+ break;
+ }
+ }
+done:
+ if (val != NULL)
+ *value = val;
+ debug_return_int(rc);
+}
+
+int
+process_hooks_unsetenv(const char *name)
+{
+ struct sudo_hook_list *hook;
+ int rc = SUDO_HOOK_RET_NEXT;
+ debug_decl(process_hooks_unsetenv, SUDO_DEBUG_HOOKS)
+
+ /* First process the hooks. */
+ for (hook = sudo_hook_unsetenv_list; hook != NULL; hook = hook->next) {
+ rc = hook->u.unsetenv_fn(name, hook->closure);
+ switch (rc) {
+ case SUDO_HOOK_RET_NEXT:
+ break;
+ case SUDO_HOOK_RET_ERROR:
+ case SUDO_HOOK_RET_STOP:
+ goto done;
+ default:
+ warningx("invalid unsetenv hook return value: %d", rc);
+ break;
+ }
+ }
+done:
+ debug_return_int(rc);
+}
+
+/* Hook registration internals. */
+static void
+register_hook_internal(struct sudo_hook_list **head,
+ int (*hook_fn)(), void *closure)
+{
+ struct sudo_hook_list *hook;
+ debug_decl(register_hook_internal, SUDO_DEBUG_HOOKS)
+
+ hook = ecalloc(1, sizeof(*hook));
+ hook->u.generic_fn = hook_fn;
+ hook->closure = closure;
+ hook->next = *head;
+ *head = hook;
+
+ debug_return;
+}
+
+/* Register the specified hook. */
+int
+register_hook(struct sudo_hook *hook)
+{
+ int rval = 0;
+ debug_decl(register_hook, SUDO_DEBUG_HOOKS)
+
+ if (SUDO_HOOK_VERSION_GET_MAJOR(hook->hook_version) != SUDO_HOOK_VERSION_MAJOR) {
+ /* Major versions must match. */
+ rval = -1;
+ } else {
+ switch (hook->hook_type) {
+ case SUDO_HOOK_GETENV:
+ register_hook_internal(&sudo_hook_getenv_list, hook->hook_fn,
+ hook->closure);
+ break;
+ case SUDO_HOOK_PUTENV:
+ register_hook_internal(&sudo_hook_putenv_list, hook->hook_fn,
+ hook->closure);
+ break;
+ case SUDO_HOOK_SETENV:
+ register_hook_internal(&sudo_hook_setenv_list, hook->hook_fn,
+ hook->closure);
+ break;
+ case SUDO_HOOK_UNSETENV:
+ register_hook_internal(&sudo_hook_unsetenv_list, hook->hook_fn,
+ hook->closure);
+ break;
+ default:
+ /* XXX - use define for unknown value */
+ rval = 1;
+ break;
+ }
+ }
+
+ debug_return_int(rval);
+}
+
+/* Hook deregistration internals. */
+static void
+deregister_hook_internal(struct sudo_hook_list **head,
+ int (*hook_fn)(), void *closure)
+{
+ struct sudo_hook_list *hook, *prev = NULL;
+ debug_decl(deregister_hook_internal, SUDO_DEBUG_HOOKS)
+
+ for (hook = *head, prev = NULL; hook != NULL; prev = hook, hook = hook->next) {
+ if (hook->u.generic_fn == hook_fn && hook->closure == closure) {
+ /* Remove from list and free. */
+ if (prev == NULL)
+ *head = hook->next;
+ else
+ prev->next = hook->next;
+ efree(hook);
+ break;
+ }
+ }
+
+ debug_return;
+}
+
+/* Deregister the specified hook. */
+int
+deregister_hook(struct sudo_hook *hook)
+{
+ int rval = 0;
+ debug_decl(deregister_hook, SUDO_DEBUG_HOOKS)
+
+ if (SUDO_HOOK_VERSION_GET_MAJOR(hook->hook_version) != SUDO_HOOK_VERSION_MAJOR) {
+ /* Major versions must match. */
+ rval = -1;
+ } else {
+ switch (hook->hook_type) {
+ case SUDO_HOOK_GETENV:
+ deregister_hook_internal(&sudo_hook_getenv_list, hook->hook_fn,
+ hook->closure);
+ break;
+ case SUDO_HOOK_PUTENV:
+ deregister_hook_internal(&sudo_hook_putenv_list, hook->hook_fn,
+ hook->closure);
+ break;
+ case SUDO_HOOK_SETENV:
+ deregister_hook_internal(&sudo_hook_setenv_list, hook->hook_fn,
+ hook->closure);
+ break;
+ case SUDO_HOOK_UNSETENV:
+ deregister_hook_internal(&sudo_hook_unsetenv_list, hook->hook_fn,
+ hook->closure);
+ break;
+ default:
+ /* XXX - use define for unknown value */
+ rval = 1;
+ break;
+ }
+ }
+
+ debug_return_int(rval);
+}
projects / debian / sudo / blobdiff