X-Git-Url: https://gitweb.michael.orlitzky.com/?a=blobdiff_plain;f=src%2Fapply-default-acl.c;h=fb472a58742c95016e7bbf6ad74e0ec19ac2f81a;hb=aeedc5826cb0594318031e35acaf8b4a1b6e7c32;hp=993b1f7649e14c50300174da1f5d87fcb534d20a;hpb=f22034c7b75b7096e6ef26de7a5bc8e12a3f0b07;p=apply-default-acl.git

diff --git a/src/apply-default-acl.c b/src/apply-default-acl.c
index 993b1f7..fb472a5 100644
--- a/src/apply-default-acl.c
+++ b/src/apply-default-acl.c
@@ -34,85 +34,6 @@
 
 
 
-/**
- * @brief Get the mode bits from the given file descriptor.
- *
- * @param fd
- *   The file descriptor (which may reference a directory) whose
- *   mode we want.
- *
- * @return A mode_t (st_mode) structure containing the mode bits.
- *   See sys/stat.h for details.
- */
-mode_t get_mode(int fd) {
-  if (fd <= 0) {
-    errno = ENOENT;
-    return ACL_ERROR;
-  }
-
-  struct stat s;
-  int result = fstat(fd, &s);
-
-  if (result == 0) {
-    return s.st_mode;
-  }
-  else {
-    /* errno will be set already by lstat() */
-    return result;
-  }
-}
-
-
-
-/**
- * @brief Determine if the given file descriptor might refer to an
- *   (unsafe) hard link.
- *
- * @param fd
- *   The file descriptor whose link count we want to investigate.
- *
- * @return true if we are certain that @c fd does not describe a hard
- *   link, and false otherwise. In case of error, false is returned,
- *   because we are not sure that @c fd is not a hard link.
- */
-bool is_hardlink_safe(int fd) {
-  if (fd <= 0) {
-    return false;
-  }
-  struct stat s;
-  if (fstat(fd, &s) == 0) {
-    return (s.st_nlink == 1 || S_ISDIR(s.st_mode));
-  }
-  else {
-    return false;
-  }
-}
-
-
-/**
- * @brief Determine whether or not the given file descriptor is for
- *   a regular file.
- *
- * @param fd
- *   The file descriptor to test for regular-fileness.
- *
- * @return true if @c fd describes a regular file, and false otherwise.
- */
-bool is_regular_file(int fd) {
-  if (fd <= 0) {
-    return false;
-  }
-
-  struct stat s;
-  if (fstat(fd, &s) == 0) {
-    return S_ISREG(s.st_mode);
-  }
-  else {
-    return false;
-  }
-}
-
-
 
 /**
  * @brief Determine whether or not the given path is accessible.
@@ -220,8 +141,7 @@ bool is_directory(int fd) {
  *   returned. Otherwise, @c ACL_SUCCESS.
  *
  */
-int acl_set_entry(acl_t* aclp,
-		  acl_entry_t entry) {
+int acl_set_entry(acl_t* aclp, acl_entry_t entry) {
 
   acl_tag_t entry_tag;
   if (acl_get_tag_type(entry, &entry_tag) == ACL_ERROR) {
@@ -482,8 +402,13 @@ int any_can_execute_or_dir(int fd) {
   int result = ACL_FAILURE;
 
   if (acl_is_minimal(acl)) {
-    mode_t mode = get_mode(fd);
-    if (mode & (S_IXUSR | S_IXOTH | S_IXGRP)) {
+    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)) {
       result = ACL_SUCCESS;
       goto cleanup;
     }
@@ -654,7 +579,8 @@ int wipe_acls(int fd) {
 int apply_default_acl(const char* path, bool no_exec_mask) {
 
   if (path == NULL) {
-    errno = ENOENT;
+    errno = EINVAL;
+    perror("apply_default_acl (args)");
     return ACL_ERROR;
   }
 
@@ -703,16 +629,21 @@ int apply_default_acl(const char* path, bool no_exec_mask) {
    * between when we open the file descriptor (look above) and when we
    * fstat it.
   */
-  if (!is_hardlink_safe(fd)) {
-    result = ACL_FAILURE;
+  struct stat s;
+  if (fstat(fd, &s) == -1) {
+    perror("apply_default_acl (fstat)");
     goto cleanup;
   }
-
-  if (!is_regular_file(fd) && !is_directory(fd)) {
-    result = ACL_FAILURE;
-    goto cleanup;
+  if (!S_ISDIR(s.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) {
+      result = ACL_FAILURE;
+      goto cleanup;
+    }
   }
 
+
   /* 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. */