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[tor-commits] [tor/release-0.4.0] Add a --list-modules command



commit 1b16fcb70cb9507184fe7316396c93c1daa12674
Author: Nick Mathewson <nickm@xxxxxxxxxxxxxx>
Date:   Thu May 9 11:26:13 2019 -0400

    Add a --list-modules command
    
    Closes ticket 30452.
---
 changes/bug30452               |  3 +++
 doc/tor.1.txt                  |  4 ++++
 src/app/config/config.c        | 13 +++++++++++++
 src/feature/dirauth/authmode.h |  4 ++++
 4 files changed, 24 insertions(+)

diff --git a/changes/bug30452 b/changes/bug30452
new file mode 100644
index 000000000..2bb401d87
--- /dev/null
+++ b/changes/bug30452
@@ -0,0 +1,3 @@
+  o Minor features (compile-time modules):
+    - Add a --list-modules command to print a list of which compile-time
+      modules are enabled. Closes ticket 30452.
diff --git a/doc/tor.1.txt b/doc/tor.1.txt
index 975a19818..f46929897 100644
--- a/doc/tor.1.txt
+++ b/doc/tor.1.txt
@@ -88,6 +88,10 @@ COMMAND-LINE OPTIONS
     List all valid options that are scheduled to become obsolete in a
     future version. (This is a warning, not a promise.)
 
+[[opt-list-modules]] **--list-modules**::
+    For each optional module, list whether or not it has been compiled
+    into Tor.  (Any module not listed is not optional in this version of Tor.)
+
 [[opt-version]] **--version**::
     Display Tor version and exit.
 
diff --git a/src/app/config/config.c b/src/app/config/config.c
index 2a504d306..7ccd76e7f 100644
--- a/src/app/config/config.c
+++ b/src/app/config/config.c
@@ -2474,6 +2474,7 @@ static const struct {
   { "--quiet",                TAKES_NO_ARGUMENT },
   { "--hush",                 TAKES_NO_ARGUMENT },
   { "--version",              TAKES_NO_ARGUMENT },
+  { "--list-modules",         TAKES_NO_ARGUMENT },
   { "--library-versions",     TAKES_NO_ARGUMENT },
   { "-h",                     TAKES_NO_ARGUMENT },
   { "--help",                 TAKES_NO_ARGUMENT },
@@ -2695,6 +2696,13 @@ list_deprecated_options(void)
   }
 }
 
+/** Print all compile-time modules and their enabled/disabled status. */
+static void
+list_enabled_modules(void)
+{
+  printf("%s: %s\n", "dirauth", have_module_dirauth() ? "yes" : "no");
+}
+
 /** Last value actually set by resolve_my_address. */
 static uint32_t last_resolved_addr = 0;
 
@@ -5198,6 +5206,11 @@ options_init_from_torrc(int argc, char **argv)
     return 1;
   }
 
+  if (config_line_find(cmdline_only_options, "--list-modules")) {
+    list_enabled_modules();
+    return 1;
+  }
+
   if (config_line_find(cmdline_only_options, "--library-versions")) {
     printf("Tor version %s. \n", get_version());
     printf("Library versions\tCompiled\t\tRuntime\n");
diff --git a/src/feature/dirauth/authmode.h b/src/feature/dirauth/authmode.h
index 40a89c739..876a1f947 100644
--- a/src/feature/dirauth/authmode.h
+++ b/src/feature/dirauth/authmode.h
@@ -27,6 +27,8 @@ authdir_mode_v3(const or_options_t *options)
   return authdir_mode(options) && options->V3AuthoritativeDir != 0;
 }
 
+#define have_module_dirauth() (1)
+
 #else /* HAVE_MODULE_DIRAUTH */
 
 #define authdir_mode(options) (((void)(options)),0)
@@ -37,6 +39,8 @@ authdir_mode_v3(const or_options_t *options)
 #define authdir_mode_bridge(options) (((void)(options)),0)
 #define authdir_mode_v3(options) (((void)(options)),0)
 
+#define have_module_dirauth() (0)
+
 #endif /* HAVE_MODULE_DIRAUTH */
 
 #endif /* TOR_MODE_H */



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