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-rw-r--r--lib/util/multiarch.c104
1 files changed, 104 insertions, 0 deletions
diff --git a/lib/util/multiarch.c b/lib/util/multiarch.c
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+/*
+ * SPDX-License-Identifier: ISC
+ *
+ * Copyright (c) 2022 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>
+
+#ifdef __linux__
+# include <sys/stat.h>
+# include <sys/utsname.h>
+#endif
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "sudo_compat.h"
+#include "sudo_util.h"
+
+# if defined(__linux__)
+/*
+ * On Linux systems that use multi-arch, the actual DSO may be in a
+ * machine-specific subdirectory. If the specified path contains
+ * /lib/ or /libexec/, insert a multi-arch directory after it.
+ * If sb is non-NULL, stat(2) will be called on the new path, filling in sb.
+ * Returns a dynamically allocated string on success and NULL on failure.
+ */
+char *
+sudo_stat_multiarch_v1(const char *path, struct stat *sb)
+{
+# if defined(__ILP32__)
+ const char *libdirs[] = { "/libx32/", "/lib/", "/libexec/", NULL };
+# elif defined(__LP64__)
+ const char *libdirs[] = { "/lib64/", "/lib/", "/libexec/", NULL };
+# else
+ const char *libdirs[] = { "/lib32/", "/lib/", "/libexec/", NULL };
+# endif
+ const char **lp, *lib, *slash;
+ struct utsname unamebuf;
+ char *newpath = NULL;
+ int len;
+
+ if (uname(&unamebuf) == -1)
+ return NULL;
+
+ for (lp = libdirs; *lp != NULL; lp++) {
+ /* Replace lib64, lib32, libx32 with lib in new path. */
+ const char *newlib = lp == libdirs ? "/lib/" : *lp;
+
+ /* Search for lib dir in path, find the trailing slash. */
+ lib = strstr(path, *lp);
+ if (lib == NULL)
+ continue;
+ slash = lib + strlen(*lp) - 1;
+
+ /* Make sure there isn't already a machine-linux-gnu dir. */
+ len = strcspn(slash + 1, "/-");
+ if (strncmp(slash + 1 + len, "-linux-gnu/", 11) == 0) {
+ /* Multiarch already present. */
+ break;
+ }
+
+ /* Add machine-linux-gnu dir after /lib/ or /libexec/. */
+ len = asprintf(&newpath, "%.*s%s%s-linux-gnu%s",
+ (int)(lib - path), path, newlib, unamebuf.machine, slash);
+ if (len == -1) {
+ newpath = NULL;
+ break;
+ }
+
+ /* If sb was set, use stat(2) to make sure newpath exists. */
+ if (sb == NULL || stat(newpath, sb) == 0)
+ break;
+ free(newpath);
+ newpath = NULL;
+ }
+
+ return newpath;
+}
+#else
+char *
+sudo_stat_multiarch_v1(const char *path, struct stat *sb)
+{
+ return NULL;
+}
+#endif /* __linux__ */