hs: Move service check private dir to hs_common.c

Another building blocks for prop224 service work. This also makes the function
takes specific argument instead of the or_option_t object.

Signed-off-by: David Goulet <dgoulet@torproject.org>

src/or/hs_common.c

@@ -16,6 +16,40 @@
 #include "hs_common.h"
 #include "rendcommon.h"
 
+/* Make sure that the directory for <b>service</b> is private, using the config
+ * <b>username</b>.
+ * If <b>create</b> is true:
+ *  - if the directory exists, change permissions if needed,
+ *  - if the directory does not exist, create it with the correct permissions.
+ * If <b>create</b> is false:
+ *  - if the directory exists, check permissions,
+ *  - if the directory does not exist, check if we think we can create it.
+ * Return 0 on success, -1 on failure. */
+int
+hs_check_service_private_dir(const char *username, const char *path,
+                             unsigned int dir_group_readable,
+                             unsigned int create)
+{
+  cpd_check_t check_opts = CPD_NONE;
+
+  tor_assert(path);
+
+  if (create) {
+    check_opts |= CPD_CREATE;
+  } else {
+    check_opts |= CPD_CHECK_MODE_ONLY;
+    check_opts |= CPD_CHECK;
+  }
+  if (dir_group_readable) {
+    check_opts |= CPD_GROUP_READ;
+  }
+  /* Check/create directory */
+  if (check_private_dir(path, check_opts, username) < 0) {
+    return -1;
+  }
+  return 0;
+}
+
 /* Create a new rend_data_t for a specific given <b>version</b>.
  * Return a pointer to the newly allocated data structure. */
 static rend_data_t *

src/or/hs_common.h

@@ -23,6 +23,10 @@
 /* String prefix for the signature of ESTABLISH_INTRO */
 #define ESTABLISH_INTRO_SIG_PREFIX "Tor establish-intro cell v1"
 
+int hs_check_service_private_dir(const char *username, const char *path,
+                                 unsigned int dir_group_readable,
+                                 unsigned int create);
+
 void rend_data_free(rend_data_t *data);
 rend_data_t *rend_data_dup(const rend_data_t *data);
 rend_data_t *rend_data_client_create(const char *onion_address,

src/or/rendservice.c

@@ -76,9 +76,6 @@ static ssize_t rend_service_parse_intro_for_v3(
 static int rend_service_check_private_dir(const or_options_t *options,
                                           const rend_service_t *s,
                                           int create);
-static int rend_service_check_private_dir_impl(const or_options_t *options,
-                                               const rend_service_t *s,
-                                               int create);
 static const smartlist_t* rend_get_service_list(
                                   const smartlist_t* substitute_service_list);
 static smartlist_t* rend_get_service_list_mutable(
@@ -1294,7 +1291,8 @@ poison_new_single_onion_hidden_service_dir_impl(const rend_service_t *service,
   }
 
   /* Make sure the directory was created before calling this function. */
-  if (BUG(rend_service_check_private_dir_impl(options, service, 0) < 0))
+  if (BUG(hs_check_service_private_dir(options->User, service->directory,
+                                       service->dir_group_readable, 0) < 0))
     return -1;
 
   poison_fname = rend_service_sos_poison_path(service);
@@ -1444,32 +1442,6 @@ rend_service_derive_key_digests(struct rend_service_t *s)
   return 0;
 }
 
-/* Implements the directory check from rend_service_check_private_dir,
- * without doing the single onion poison checks. */
-static int
-rend_service_check_private_dir_impl(const or_options_t *options,
-                                    const rend_service_t *s,
-                                    int create)
-{
-  cpd_check_t  check_opts = CPD_NONE;
-  if (create) {
-    check_opts |= CPD_CREATE;
-  } else {
-    check_opts |= CPD_CHECK_MODE_ONLY;
-    check_opts |= CPD_CHECK;
-  }
-  if (s->dir_group_readable) {
-    check_opts |= CPD_GROUP_READ;
-  }
-  /* Check/create directory */
-  if (check_private_dir(s->directory, check_opts, options->User) < 0) {
-    log_warn(LD_REND, "Checking service directory %s failed.", s->directory);
-    return -1;
-  }
-
-  return 0;
-}
-
 /** Make sure that the directory for <b>s</b> is private, using the config in
  * <b>options</b>.
  * If <b>create</b> is true:
@@ -1490,7 +1462,8 @@ rend_service_check_private_dir(const or_options_t *options,
   }
 
   /* Check/create directory */
-  if (rend_service_check_private_dir_impl(options, s, create) < 0) {
+  if (hs_check_service_private_dir(options->User, s->directory,
+                                   s->dir_group_readable, create) < 0) {
     return -1;
   }