Split the client-only parts of init_keys() into a separate function

This should simplify the callgraph a little more.

changes/decouple_init_keys

@@ -0,0 +1,3 @@
+  o Code simplification and refactoring:
+    - Move the client-only parts of init_keys() into a separate function.
+      Closes ticket 16763.

src/or/main.c

@@ -1888,7 +1888,7 @@ ip_address_changed(int at_interface)
   if (at_interface) {
     if (! server) {
       /* Okay, change our keys. */
-      if (init_keys()<0)
+      if (init_keys_client() < 0)
         log_warn(LD_GENERAL, "Unable to rotate keys after IP change!");
     }
   } else {

src/or/router.c

@@ -767,6 +767,46 @@ router_write_fingerprint(int hashed)
   return result;
 }
 
+static int
+init_keys_common(void)
+{
+  if (!key_lock)
+    key_lock = tor_mutex_new();
+
+  /* There are a couple of paths that put us here before we've asked
+   * openssl to initialize itself. */
+  if (crypto_global_init(get_options()->HardwareAccel,
+                         get_options()->AccelName,
+                         get_options()->AccelDir)) {
+    log_err(LD_BUG, "Unable to initialize OpenSSL. Exiting.");
+    return -1;
+  }
+
+  return 0;
+}
+
+int
+init_keys_client(void)
+{
+  crypto_pk_t *prkey;
+  if (init_keys_common() < 0)
+    return -1;
+
+  if (!(prkey = crypto_pk_new()))
+    return -1;
+  if (crypto_pk_generate_key(prkey)) {
+    crypto_pk_free(prkey);
+    return -1;
+  }
+  set_client_identity_key(prkey);
+  /* Create a TLS context. */
+  if (router_initialize_tls_context() < 0) {
+    log_err(LD_GENERAL,"Error creating TLS context for Tor client.");
+    return -1;
+  }
+  return 0;
+}
+
 /** Initialize all OR private keys, and the TLS context, as necessary.
  * On OPs, this only initializes the tls context. Return 0 on success,
  * or -1 if Tor should die.
@@ -786,35 +826,13 @@ init_keys(void)
   int v3_digest_set = 0;
   authority_cert_t *cert = NULL;
 
-  if (!key_lock)
-    key_lock = tor_mutex_new();
-
-  /* There are a couple of paths that put us here before we've asked
-   * openssl to initialize itself. */
-  if (crypto_global_init(get_options()->HardwareAccel,
-                         get_options()->AccelName,
-                         get_options()->AccelDir)) {
-    log_err(LD_BUG, "Unable to initialize OpenSSL. Exiting.");
-    return -1;
-  }
-
   /* OP's don't need persistent keys; just make up an identity and
    * initialize the TLS context. */
   if (!server_mode(options)) {
-    if (!(prkey = crypto_pk_new()))
-      return -1;
-    if (crypto_pk_generate_key(prkey)) {
-      crypto_pk_free(prkey);
-      return -1;
-    }
-    set_client_identity_key(prkey);
-    /* Create a TLS context. */
-    if (router_initialize_tls_context() < 0) {
-      log_err(LD_GENERAL,"Error creating TLS context for Tor client.");
-      return -1;
-    }
-    return 0;
+    return init_keys_client();
   }
+  if (init_keys_common() < 0)
+    return -1;
   /* Make sure DataDirectory exists, and is private. */
   if (check_private_dir(options->DataDirectory, CPD_CREATE, options->User)) {
     return -1;

src/or/router.h

@@ -37,6 +37,7 @@ void ntor_key_map_free(di_digest256_map_t *map);
 
 int router_initialize_tls_context(void);
 int init_keys(void);
+int init_keys_client(void);
 
 int check_whether_orport_reachable(void);
 int check_whether_dirport_reachable(void);