X-Git-Url: https://gitweb.michael.orlitzky.com/?a=blobdiff_plain;f=src%2Fapply-default-acl.c;h=0a70b09d27dc7c88355e9cc339016b1f33357647;hb=7e0a431bdbba1757b4fc54289dcfb5f26b59781e;hp=fb472a58742c95016e7bbf6ad74e0ec19ac2f81a;hpb=aeedc5826cb0594318031e35acaf8b4a1b6e7c32;p=apply-default-acl.git

diff --git a/src/apply-default-acl.c b/src/apply-default-acl.c
index fb472a5..0a70b09 100644
--- a/src/apply-default-acl.c
+++ b/src/apply-default-acl.c
@@ -69,54 +69,6 @@ bool path_accessible(const char* path) {
 
 
 
-/**
- * @brief Determine whether or not the given path is a directory.
- *
- * @param path
- *   The path to test.
- *
- * @return true if @c path is a directory, false otherwise.
- */
-bool is_path_directory(const char* path) {
-  if (path == NULL) {
-    return false;
-  }
-
-  struct stat s;
-  if (lstat(path, &s) == 0) {
-    return S_ISDIR(s.st_mode);
-  }
-  else {
-    return false;
-  }
-}
-
-
-/**
- * @brief Determine whether or not the given file descriptor is for
- *   a directory.
- *
- * @param fd
- *   The file descriptor whose directoryness is in question.
- *
- * @return true if @c fd describes a directory, and false otherwise.
- */
-bool is_directory(int fd) {
-  if (fd <= 0) {
-    return false;
-  }
-
-  struct stat s;
-  if (fstat(fd, &s) == 0) {
-    return S_ISDIR(s.st_mode);
-  }
-  else {
-    return false;
-  }
-}
-
-
-
 /**
  * @brief Update (or create) an entry in an @b minimal ACL.
  *
@@ -363,38 +315,30 @@ int acl_execute_masked(acl_t acl) {
 
 
 /**
- * @brief Determine whether @c fd is executable (by anyone) or a
- *   directory.
+ * @brief Determine whether @c fd is executable by anyone.
+ *
  *
  * This is used as part of the heuristic to determine whether or not
  * we should mask the execute bit when inheriting an ACL. If @c fd
- * describes a directory, the answer is a clear-cut yes. This behavior
- * is modeled after the capital 'X' perms of setfacl.
- *
- * If @c fd describes a file, we check the @a effective permissions,
- * contrary to what setfacl does.
+ * describes a file, we check the @a effective permissions, contrary
+ * to what setfacl does.
  *
  * @param fd
  *   The file descriptor to check.
  *
+ * @param sp
+ *   A pointer to a stat structure for @c fd.
+ *
  * @return
- *   - @c ACL_SUCCESS - @c fd describes a directory, or someone has effective
-       execute permissions.
- *   - @c ACL_FAILURE - @c fd describes a regular file and nobody can execute
-       it.
+ *   - @c ACL_SUCCESS - Someone has effective execute permissions on @c fd.
+ *   - @c ACL_FAILURE - Nobody can execute @c fd.
  *   - @c ACL_ERROR - Unexpected library error.
  */
-int any_can_execute_or_dir(int fd) {
-
-  if (is_directory(fd)) {
-    /* That was easy... */
-    return ACL_SUCCESS;
-  }
-
+int any_can_execute(int fd, const struct stat* sp) {
   acl_t acl = acl_get_fd(fd);
 
   if (acl == (acl_t)NULL) {
-    perror("any_can_execute_or_dir (acl_get_file)");
+    perror("any_can_execute (acl_get_file)");
     return ACL_ERROR;
   }
 
@@ -402,13 +346,7 @@ int any_can_execute_or_dir(int fd) {
   int result = ACL_FAILURE;
 
   if (acl_is_minimal(acl)) {
-    struct stat s;
-    if (fstat(fd, &s) == -1) {
-      perror("any_can_execute_or_dir (fstat)");
-      result = ACL_ERROR;
-      goto cleanup;
-    }
-    if (s.st_mode & (S_IXUSR | S_IXOTH | S_IXGRP)) {
+    if (sp->st_mode & (S_IXUSR | S_IXOTH | S_IXGRP)) {
       result = ACL_SUCCESS;
       goto cleanup;
     }
@@ -427,7 +365,7 @@ int any_can_execute_or_dir(int fd) {
     acl_tag_t tag = ACL_UNDEFINED_TAG;
 
     if (acl_get_tag_type(entry, &tag) == ACL_ERROR) {
-      perror("any_can_execute_or_dir (acl_get_tag_type)");
+      perror("any_can_execute_or (acl_get_tag_type)");
       result = ACL_ERROR;
       goto cleanup;
     }
@@ -441,14 +379,14 @@ int any_can_execute_or_dir(int fd) {
     acl_permset_t permset;
 
     if (acl_get_permset(entry, &permset) == ACL_ERROR) {
-      perror("any_can_execute_or_dir (acl_get_permset)");
+      perror("any_can_execute_or (acl_get_permset)");
       result = ACL_ERROR;
       goto cleanup;
     }
 
     int gp_result = acl_get_perm(permset, ACL_EXECUTE);
     if (gp_result == ACL_ERROR) {
-      perror("any_can_execute_or_dir (acl_get_perm)");
+      perror("any_can_execute (acl_get_perm)");
       result = ACL_ERROR;
       goto cleanup;
     }
@@ -465,7 +403,7 @@ int any_can_execute_or_dir(int fd) {
   }
 
   if (ge_result == ACL_ERROR) {
-    perror("any_can_execute_or_dir (acl_get_entry)");
+    perror("any_can_execute (acl_get_entry)");
     result = ACL_ERROR;
     goto cleanup;
   }
@@ -478,11 +416,10 @@ int any_can_execute_or_dir(int fd) {
 
 
 /**
- * @brief Set @c acl as the default ACL on @c path if it's a directory.
+ * @brief Set @c acl as the default ACL on @c path.
  *
- * This overwrites any existing default ACL on @c path. If no default
- * ACL exists, then one is created. If @c path is not a directory, we
- * return ACL_FAILURE but no error is raised.
+ * This overwrites any existing default ACL on @c path. If @c path is
+ * not a directory, we return ACL_ERROR and @c errno is set.
  *
  * @param path
  *   The target directory whose ACL we wish to replace or create.
@@ -492,21 +429,17 @@ int any_can_execute_or_dir(int fd) {
  *
  * @return
  *   - @c ACL_SUCCESS - The default ACL was assigned successfully.
- *   - @c ACL_FAILURE - If @c path is not a directory.
  *   - @c ACL_ERROR - Unexpected library error.
  */
 int assign_default_acl(const char* path, acl_t acl) {
 
   if (path == NULL) {
-    errno = ENOENT;
+    errno = EINVAL;
+    perror("assign_default_acl (args)");
     return ACL_ERROR;
   }
 
-  if (!is_path_directory(path)) {
-    return ACL_FAILURE;
-  }
-
-    /* Our return value; success unless something bad happens. */
+  /* Our return value; success unless something bad happens. */
   int result = ACL_SUCCESS;
   acl_t path_acl = acl_dup(acl);
 
@@ -567,6 +500,10 @@ int wipe_acls(int fd) {
  * @param path
  *   The path whose ACL we would like to reset to its default.
  *
+ * @param sp
+ *   A pointer to a stat structure for @c path, or @c NULL if you don't
+ *   have one handy.
+ *
  * @param no_exec_mask
  *   The value (either true or false) of the --no-exec-mask flag.
  *
@@ -576,7 +513,9 @@ int wipe_acls(int fd) {
  *     or the parent of @c path is not a directory.
  *   - @c ACL_ERROR - Unexpected library error.
  */
-int apply_default_acl(const char* path, bool no_exec_mask) {
+int apply_default_acl(const char* path,
+		      const struct stat* sp,
+		      bool no_exec_mask) {
 
   if (path == NULL) {
     errno = EINVAL;
@@ -628,16 +567,24 @@ int apply_default_acl(const char* path, bool no_exec_mask) {
    * race condition here, but the window is as small as possible
    * between when we open the file descriptor (look above) and when we
    * fstat it.
+   *
+   * Note: we only need to call fstat ourselves if we weren't passed a
+   * valid pointer to a stat structure (nftw does that).
   */
-  struct stat s;
-  if (fstat(fd, &s) == -1) {
-    perror("apply_default_acl (fstat)");
-    goto cleanup;
+  if (sp == NULL) {
+    struct stat s;
+    if (fstat(fd, &s) == -1) {
+      perror("apply_default_acl (fstat)");
+      goto cleanup;
+    }
+
+    sp = &s;
   }
-  if (!S_ISDIR(s.st_mode)) {
+
+  if (!S_ISDIR(sp->st_mode)) {
     /* If it's not a directory, make sure it's a regular,
        non-hard-linked file. */
-    if (!S_ISREG(s.st_mode) || s.st_nlink != 1) {
+    if (!S_ISREG(sp->st_mode) || sp->st_nlink != 1) {
       result = ACL_FAILURE;
       goto cleanup;
     }
@@ -646,14 +593,16 @@ int apply_default_acl(const char* path, bool no_exec_mask) {
 
   /* Default to not masking the exec bit; i.e. applying the default
      ACL literally. If --no-exec-mask was not specified, then we try
-     to "guess" whether or not to mask the exec bit. */
+     to "guess" whether or not to mask the exec bit. This behavior
+     is modeled after the capital 'X' perms of setfacl. */
   bool allow_exec = true;
 
   if (!no_exec_mask) {
-    int ace_result = any_can_execute_or_dir(fd);
+    /* Never mask the execute bit on directories. */
+    int ace_result = any_can_execute(fd,sp) || S_ISDIR(sp->st_mode);
 
     if (ace_result == ACL_ERROR) {
-      perror("apply_default_acl (any_can_execute_or_dir)");
+      perror("apply_default_acl (any_can_execute)");
       result = ACL_ERROR;
       goto cleanup;
     }
@@ -684,8 +633,13 @@ int apply_default_acl(const char* path, bool no_exec_mask) {
     goto cleanup;
   }
 
-  /* If it's a directory, inherit the parent's default. */
-  if (assign_default_acl(path, defacl) == ACL_ERROR) {
+  /* If it's a directory, inherit the parent's default. We sure hope
+   * that "path" still points to the same thing that "fd" and this
+   * "sp" describe. If not, we may wind up trying to set a default ACL
+   * on a file, and this will throw an error. I guess that's what we
+   * want to do?
+   */
+  if (S_ISDIR(sp->st_mode) && assign_default_acl(path, defacl) == ACL_ERROR) {
     perror("apply_default_acl (assign_default_acl)");
     result = ACL_ERROR;
     goto cleanup;
@@ -822,11 +776,11 @@ void usage(const char* program_name) {
  *
  */
 int apply_default_acl_nftw(const char *target,
-			   const struct stat *s,
+			   const struct stat *sp,
 			   int info,
 			   struct FTW *ftw) {
 
-  if (apply_default_acl(target, false)) {
+  if (apply_default_acl(target, sp, false)) {
     return FTW_CONTINUE;
   }
   else {
@@ -844,11 +798,11 @@ int apply_default_acl_nftw(const char *target,
  *
  */
 int apply_default_acl_nftw_x(const char *target,
-			     const struct stat *s,
+			     const struct stat *sp,
 			     int info,
 			     struct FTW *ftw) {
 
-  if (apply_default_acl(target, true)) {
+  if (apply_default_acl(target, sp, true)) {
     return FTW_CONTINUE;
   }
   else {
@@ -883,11 +837,6 @@ int apply_default_acl_nftw_x(const char *target,
  *   we still return @c false.
  */
 bool apply_default_acl_recursive(const char *target, bool no_exec_mask) {
-
-  if (!is_path_directory(target)) {
-    return apply_default_acl(target, no_exec_mask);
-  }
-
   int max_levels = 256;
   int flags = FTW_PHYS; /* Don't follow links. */
 
@@ -987,7 +936,7 @@ int main(int argc, char* argv[]) {
     }
     else {
       /* It's either a normal file, or we're not operating recursively. */
-      reapp_result = apply_default_acl(target, no_exec_mask);
+      reapp_result = apply_default_acl(target, NULL, no_exec_mask);
     }
 
     if (!reapp_result) {