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-rw-r--r--lib/util/sudo_dso.c325
1 files changed, 325 insertions, 0 deletions
diff --git a/lib/util/sudo_dso.c b/lib/util/sudo_dso.c
new file mode 100644
index 0000000..39d4381
--- /dev/null
+++ b/lib/util/sudo_dso.c
@@ -0,0 +1,325 @@
+/*
+ * Copyright (c) 2010, 2012-2014 Todd C. Miller <Todd.Miller@sudo.ws>
+ *
+ * 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.
+ */
+
+/*
+ * This is an open source non-commercial project. Dear PVS-Studio, please check it.
+ * PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
+ */
+
+#include <config.h>
+
+#include <sys/types.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#ifdef HAVE_STRING_H
+# include <string.h>
+#endif /* HAVE_STRING_H */
+#ifdef HAVE_STRINGS_H
+# include <strings.h>
+#endif /* HAVE_STRINGS_H */
+#if defined(HAVE_SHL_LOAD)
+# include <dl.h>
+#elif defined(HAVE_DLOPEN)
+# include <dlfcn.h>
+#endif
+#include <errno.h>
+
+#include "sudo_compat.h"
+#include "sudo_dso.h"
+
+/*
+ * Pointer for statically compiled symbols.
+ */
+static struct sudo_preload_table *preload_table;
+
+void
+sudo_dso_preload_table_v1(struct sudo_preload_table *table)
+{
+ preload_table = table;
+}
+
+#if defined(HAVE_SHL_LOAD)
+
+# ifndef DYNAMIC_PATH
+# define DYNAMIC_PATH 0
+# endif
+
+void *
+sudo_dso_load_v1(const char *path, int mode)
+{
+ struct sudo_preload_table *pt;
+ int flags = DYNAMIC_PATH | BIND_VERBOSE;
+
+ if (mode == 0)
+ mode = SUDO_DSO_LAZY; /* default behavior */
+
+ /* Check prelinked symbols first. */
+ if (preload_table != NULL) {
+ for (pt = preload_table; pt->handle != NULL; pt++) {
+ if (pt->path != NULL && strcmp(path, pt->path) == 0)
+ return pt->handle;
+ }
+ }
+
+ /* We don't support SUDO_DSO_GLOBAL or SUDO_DSO_LOCAL yet. */
+ if (ISSET(mode, SUDO_DSO_LAZY))
+ flags |= BIND_DEFERRED;
+ if (ISSET(mode, SUDO_DSO_NOW))
+ flags |= BIND_IMMEDIATE;
+
+ return (void *)shl_load(path, flags, 0L);
+}
+
+int
+sudo_dso_unload_v1(void *handle)
+{
+ struct sudo_preload_table *pt;
+
+ /* Check prelinked symbols first. */
+ if (preload_table != NULL) {
+ for (pt = preload_table; pt->handle != NULL; pt++) {
+ if (pt->handle == handle)
+ return 0;
+ }
+ }
+
+ return shl_unload((shl_t)handle);
+}
+
+void *
+sudo_dso_findsym_v1(void *vhandle, const char *symbol)
+{
+ struct sudo_preload_table *pt;
+ shl_t handle = vhandle;
+ void *value = NULL;
+
+ /* Check prelinked symbols first. */
+ if (preload_table != NULL) {
+ for (pt = preload_table; pt->handle != NULL; pt++) {
+ if (pt->handle == handle) {
+ struct sudo_preload_symbol *sym;
+ for (sym = pt->symbols; sym->name != NULL; sym++) {
+ if (strcmp(sym->name, symbol) == 0)
+ return sym->addr;
+ }
+ errno = ENOENT;
+ return NULL;
+ }
+ }
+ }
+
+ /*
+ * Note that the behavior of of SUDO_DSO_NEXT and SUDO_DSO_SELF
+ * differs from most implementations when called from
+ * a shared library.
+ */
+ if (vhandle == SUDO_DSO_NEXT) {
+ /* Iterate over all shared libs looking for symbol. */
+ shl_t myhandle = PROG_HANDLE;
+ struct shl_descriptor *desc;
+ int idx = 0;
+
+ /* Find program's real handle. */
+ if (shl_gethandle(PROG_HANDLE, &desc) == 0)
+ myhandle = desc->handle;
+ while (shl_get(idx++, &desc) == 0) {
+ if (desc->handle == myhandle)
+ continue;
+ if (shl_findsym(&desc->handle, symbol, TYPE_UNDEFINED, &value) == 0)
+ break;
+ }
+ } else {
+ if (vhandle == SUDO_DSO_DEFAULT)
+ handle = NULL;
+ else if (vhandle == SUDO_DSO_SELF)
+ handle = PROG_HANDLE;
+ (void)shl_findsym(&handle, symbol, TYPE_UNDEFINED, &value);
+ }
+
+ return value;
+}
+
+char *
+sudo_dso_strerror_v1(void)
+{
+ return strerror(errno);
+}
+
+#elif defined(HAVE_DLOPEN)
+
+# ifndef RTLD_GLOBAL
+# define RTLD_GLOBAL 0
+# endif
+
+void *
+sudo_dso_load_v1(const char *path, int mode)
+{
+ struct sudo_preload_table *pt;
+ int flags = 0;
+
+ /* Check prelinked symbols first. */
+ if (preload_table != NULL) {
+ for (pt = preload_table; pt->handle != NULL; pt++) {
+ if (pt->path != NULL && strcmp(path, pt->path) == 0)
+ return pt->handle;
+ }
+ }
+
+ /* Map SUDO_DSO_* -> RTLD_* */
+ if (ISSET(mode, SUDO_DSO_LAZY))
+ flags |= RTLD_LAZY;
+ if (ISSET(mode, SUDO_DSO_NOW))
+ flags |= RTLD_NOW;
+ if (ISSET(mode, SUDO_DSO_GLOBAL))
+ flags |= RTLD_GLOBAL;
+ if (ISSET(mode, SUDO_DSO_LOCAL))
+ flags |= RTLD_LOCAL;
+
+ return dlopen(path, flags);
+}
+
+int
+sudo_dso_unload_v1(void *handle)
+{
+ struct sudo_preload_table *pt;
+
+ /* Check prelinked symbols first. */
+ if (preload_table != NULL) {
+ for (pt = preload_table; pt->handle != NULL; pt++) {
+ if (pt->handle == handle)
+ return 0;
+ }
+ }
+
+ return dlclose(handle);
+}
+
+void *
+sudo_dso_findsym_v1(void *handle, const char *symbol)
+{
+ struct sudo_preload_table *pt;
+
+ /* Check prelinked symbols first. */
+ if (preload_table != NULL) {
+ for (pt = preload_table; pt->handle != NULL; pt++) {
+ if (pt->handle == handle) {
+ struct sudo_preload_symbol *sym;
+ for (sym = pt->symbols; sym->name != NULL; sym++) {
+ if (strcmp(sym->name, symbol) == 0)
+ return sym->addr;
+ }
+ errno = ENOENT;
+ return NULL;
+ }
+ }
+ }
+
+ /*
+ * Not all implementations support the special handles.
+ */
+ if (handle == SUDO_DSO_NEXT) {
+# ifdef RTLD_NEXT
+ handle = RTLD_NEXT;
+# else
+ errno = ENOENT;
+ return NULL;
+# endif
+ } else if (handle == SUDO_DSO_DEFAULT) {
+# ifdef RTLD_DEFAULT
+ handle = RTLD_DEFAULT;
+# else
+ errno = ENOENT;
+ return NULL;
+# endif
+ } else if (handle == SUDO_DSO_SELF) {
+# ifdef RTLD_SELF
+ handle = RTLD_SELF;
+# else
+ errno = ENOENT;
+ return NULL;
+# endif
+ }
+
+ return dlsym(handle, symbol);
+}
+
+char *
+sudo_dso_strerror_v1(void)
+{
+ return dlerror();
+}
+
+#else /* !HAVE_SHL_LOAD && !HAVE_DLOPEN */
+
+/*
+ * Emulate dlopen() using a static list of symbols compiled into sudo.
+ */
+void *
+sudo_dso_load_v1(const char *path, int mode)
+{
+ struct sudo_preload_table *pt;
+
+ /* Check prelinked symbols first. */
+ if (preload_table != NULL) {
+ for (pt = preload_table; pt->handle != NULL; pt++) {
+ if (pt->path != NULL && strcmp(path, pt->path) == 0)
+ return pt->handle;
+ }
+ }
+ return NULL;
+}
+
+int
+sudo_dso_unload_v1(void *handle)
+{
+ struct sudo_preload_table *pt;
+
+ if (preload_table != NULL) {
+ for (pt = preload_table; pt->handle != NULL; pt++) {
+ if (pt->handle == handle)
+ return 0;
+ }
+ }
+ return -1;
+}
+
+void *
+sudo_dso_findsym_v1(void *handle, const char *symbol)
+{
+ struct sudo_preload_table *pt;
+
+ if (preload_table != NULL) {
+ for (pt = preload_table; pt->handle != NULL; pt++) {
+ if (pt->handle == handle) {
+ struct sudo_preload_symbol *sym;
+ for (sym = pt->symbols; sym->name != NULL; sym++) {
+ if (strcmp(sym->name, symbol) == 0)
+ return sym->addr;
+ }
+ }
+ }
+ }
+ errno = ENOENT;
+ return NULL;
+}
+
+char *
+sudo_dso_strerror_v1(void)
+{
+ return strerror(errno);
+}
+#endif /* !HAVE_SHL_LOAD && !HAVE_DLOPEN */
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-22 10:16:08 +0000