From 1c4b140427aeb36d80475e92fe57154fcc8abcf3 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Alexander=20F=C3=A6r=C3=B8y?= <ahf@torproject.org>
Date: Wed, 9 Sep 2020 22:08:54 +0000
Subject: [PATCH] Check if glob() is available at build-time.

This patch disables the glob() support in the path library if glob() is
unavailable at build-time. This currently happens with the Android NDK
used for Tor Browser.

See: https://bugs.torproject.org/tpo/core/tor/40114
---
 configure.ac         |  2 ++
 src/lib/fs/path.c    | 15 ++++++++++-----
 src/test/test_util.c | 12 ++++++++++++
 3 files changed, 24 insertions(+), 5 deletions(-)

diff --git a/configure.ac b/configure.ac
index 2e1de76606..74f2379fca 100644
--- a/configure.ac
+++ b/configure.ac
@@ -845,6 +845,8 @@ fi
 AM_CONDITIONAL(BUILD_READPASSPHRASE_C,
   test "x$ac_cv_func_readpassphrase" = "xno" && test "$bwin32" = "false")
 
+AC_CHECK_FUNCS(glob)
+
 AC_MSG_CHECKING([whether free(NULL) works])
 AC_RUN_IFELSE([AC_LANG_PROGRAM([
   #include <stdlib.h>
diff --git a/src/lib/fs/path.c b/src/lib/fs/path.c
index f03cecf52d..1a15969419 100644
--- a/src/lib/fs/path.c
+++ b/src/lib/fs/path.c
@@ -532,7 +532,7 @@ unglob_win32(const char *pattern, int prev_sep, int next_sep)
   tor_free(path_until_glob);
   return result;
 }
-#else /* !defined(_WIN32) */
+#elif HAVE_GLOB
 /** Same as opendir but calls sandbox_intern_string before */
 static DIR *
 prot_opendir(const char *name)
@@ -559,7 +559,7 @@ wrap_closedir(void *arg)
 {
   closedir(arg);
 }
-#endif /* defined(_WIN32) */
+#endif /* defined(HAVE_GLOB) */
 
 /** Return a new list containing the paths that match the pattern
  * <b>pattern</b>. Return NULL on error. On POSIX systems, errno is set by the
@@ -568,14 +568,15 @@ wrap_closedir(void *arg)
 struct smartlist_t *
 tor_glob(const char *pattern)
 {
-  smartlist_t *result;
+  smartlist_t *result = NULL;
+
 #ifdef _WIN32
   // PathMatchSpec does not support forward slashes, change them to backslashes
   char *pattern_normalized = tor_strdup(pattern);
   tor_strreplacechar(pattern_normalized, '/', *PATH_SEPARATOR);
   result = get_glob_paths(pattern_normalized, unglob_win32, true);
   tor_free(pattern_normalized);
-#else /* !(defined(_WIN32)) */
+#elif HAVE_GLOB /* !(defined(_WIN32)) */
   glob_t matches;
   int flags = GLOB_ERR | GLOB_NOSORT;
 #ifdef GLOB_ALTDIRFUNC
@@ -608,7 +609,11 @@ tor_glob(const char *pattern)
     smartlist_add(result, match);
   }
   globfree(&matches);
-#endif /* defined(_WIN32) */
+#else
+  (void)pattern;
+  return result;
+#endif /* !defined(HAVE_GLOB) */
+
   return result;
 }
 
diff --git a/src/test/test_util.c b/src/test/test_util.c
index 0e2550d5c5..3ce7103ade 100644
--- a/src/test/test_util.c
+++ b/src/test/test_util.c
@@ -4440,6 +4440,7 @@ test_util_glob(void *ptr)
 {
   (void)ptr;
 
+#ifdef HAVE_GLOB
   smartlist_t *results = NULL;
   int r, i;
   char *dir1 = NULL, *dir2 = NULL, *forbidden = NULL, *dirname = NULL;
@@ -4656,6 +4657,11 @@ test_util_glob(void *ptr)
     SMARTLIST_FOREACH(results, char *, f, tor_free(f));
     smartlist_free(results);
   }
+#else
+  tt_skip();
+ done:
+  return;
+#endif
 }
 
 static void
@@ -4663,6 +4669,7 @@ test_util_get_glob_opened_files(void *ptr)
 {
   (void)ptr;
 
+#ifdef HAVE_GLOB
   smartlist_t *results = NULL;
   int r, i;
   char *dir1 = NULL, *dir2 = NULL, *forbidden = NULL, *dirname = NULL;
@@ -4843,6 +4850,11 @@ test_util_get_glob_opened_files(void *ptr)
     SMARTLIST_FOREACH(results, char *, f, tor_free(f));
     smartlist_free(results);
   }
+#else
+  tt_skip();
+ done:
+  return;
+#endif
 }
 
 static void