From 41f786cc0a392c238068919709a63985134bb9b1 Mon Sep 17 00:00:00 2001 From: Michael Brown Date: Thu, 26 Jan 2017 11:39:25 +0000 Subject: [PATCH] [settings] Add "unixtime" builtin setting to expose the current time Expose the current wall-clock time (in seconds since the Epoch), since this is often useful in captured boot logs and can also be useful when checking unexpected X.509 certificate validation failures. Use a :uint32 setting to avoid Y2K38 rollover, thereby ensuring that this will eventually be somebody else's problem. Signed-off-by: Michael Brown --- src/core/settings.c | 33 +++++++++++++++++++++++++++++++++ 1 file changed, 33 insertions(+) diff --git a/src/core/settings.c b/src/core/settings.c index c306054d..e60a882a 100644 --- a/src/core/settings.c +++ b/src/core/settings.c @@ -31,6 +31,7 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL ); #include #include #include +#include #include #include #include @@ -2552,6 +2553,38 @@ struct builtin_setting version_builtin_setting __builtin_setting = { .fetch = version_fetch, }; +/** + * Fetch current time setting + * + * @v data Buffer to fill with setting data + * @v len Length of buffer + * @ret len Length of setting data, or negative error + */ +static int unixtime_fetch ( void *data, size_t len ) { + uint32_t content; + + /* Return current time */ + content = htonl ( time(NULL) ); + if ( len > sizeof ( content ) ) + len = sizeof ( content ); + memcpy ( data, &content, len ); + return sizeof ( content ); +} + +/** Current time setting */ +const struct setting unixtime_setting __setting ( SETTING_MISC, unixtime ) = { + .name = "unixtime", + .description = "Seconds since the Epoch", + .type = &setting_type_uint32, + .scope = &builtin_scope, +}; + +/** Current time built-in setting */ +struct builtin_setting unixtime_builtin_setting __builtin_setting = { + .setting = &unixtime_setting, + .fetch = unixtime_fetch, +}; + /** * Fetch built-in setting *