Fix glob processing on BSD systems. #40318

On Linux systems, glob automatically ignores the errors ENOENT and
ENOTDIR because they are expected during glob expansion. But BSD
systems do not ignore these, resulting in glob failing when globs
expand to invalid paths. This is fixed by adding a custom error
handler that ignores only these two errors and removing the
GLOB_ERR flag as it makes glob fail even if the error handler
ignores the error and is unnecessary as the error handler will
make glob fail on all other errors anyway.

diff --git a/changes/bug40318 b/changes/bug40318
new file mode 100644 (file)
index 0000000..cc02f08
--- /dev/null
+++ b/changes/bug40318
@@ -0,0 +1,4 @@
+  o Minor bugfixes (configuration tests bsd):
+    - Fix glob processing errors when globs expand to invalid paths on
+      BSD systems. Fixes bug 40318; bugfix on 0.4.5.1-alpha. Patch by
+      Daniel Pinto.

diff --git a/src/lib/fs/path.c b/src/lib/fs/path.c
index c2fdddb9db6adda598c5e0dd791a01f78809ddf1..81960bd69acbdc714fbef21d9190ee81d0459a69 100644 (file)
--- a/src/lib/fs/path.c
+++ b/src/lib/fs/path.c
@@ -571,6 +571,19 @@ wrap_closedir(void *arg)
 {
   closedir(arg);
 }
+
+/** Function passed to glob to handle processing errors. <b>epath</b> is the
+ * path that caused the error and <b>eerrno</b> is the errno set by the
+ * function that failed. We want to ignore ENOENT and ENOTDIR because, in BSD
+ * systems, these are not ignored automatically, which makes glob fail when
+ * globs expand to non-existing paths and GLOB_ERR is set.
+ */
+static int
+glob_errfunc(const char *epath, int eerrno)
+{
+    (void)epath;
+    return eerrno == ENOENT || eerrno == ENOTDIR ? 0 : -1;
+}
 #endif /* defined(HAVE_GLOB) */
 
 /** Return a new list containing the paths that match the pattern
@@ -591,7 +604,7 @@ tor_glob(const char *pattern)
   tor_free(pattern_normalized);
 #elif HAVE_GLOB /* !(defined(_WIN32)) */
   glob_t matches;
-  int flags = GLOB_ERR | GLOB_NOSORT;
+  int flags = GLOB_NOSORT;
 #ifdef GLOB_ALTDIRFUNC
   /* use functions that call sandbox_intern_string */
   flags |= GLOB_ALTDIRFUNC;
@@ -604,7 +617,10 @@ tor_glob(const char *pattern)
   matches.gl_stat = &prot_stat;
   matches.gl_lstat = &prot_lstat;
 #endif /* defined(GLOB_ALTDIRFUNC) */
-  int ret = glob(pattern, flags, NULL, &matches);
+  // use custom error handler to workaround BSD quirks and do not set GLOB_ERR
+  // because it would make glob fail on error even if the error handler ignores
+  // the error
+  int ret = glob(pattern, flags, glob_errfunc, &matches);
   if (ret == GLOB_NOMATCH) {
     return smartlist_new();
   } else if (ret != 0) {