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[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 <mcb30@ipxe.org>
tags/v1.20.1
Michael Brown 7 years ago
parent
commit
41f786cc0a
1 changed files with 33 additions and 0 deletions
  1. 33
    0
      src/core/settings.c

+ 33
- 0
src/core/settings.c View File

@@ -31,6 +31,7 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
31 31
 #include <byteswap.h>
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 #include <errno.h>
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 #include <assert.h>
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+#include <time.h>
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 #include <ipxe/in.h>
35 36
 #include <ipxe/ip.h>
36 37
 #include <ipxe/ipv6.h>
@@ -2552,6 +2553,38 @@ struct builtin_setting version_builtin_setting __builtin_setting = {
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 	.fetch = version_fetch,
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 };
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+/**
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+ * Fetch current time setting
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+ *
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+ * @v data		Buffer to fill with setting data
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+ * @v len		Length of buffer
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+ * @ret len		Length of setting data, or negative error
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+ */
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+static int unixtime_fetch ( void *data, size_t len ) {
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+	uint32_t content;
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+
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+	/* Return current time */
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+	content = htonl ( time(NULL) );
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+	if ( len > sizeof ( content ) )
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+		len = sizeof ( content );
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+	memcpy ( data, &content, len );
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+	return sizeof ( content );
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+}
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+
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+/** Current time setting */
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+const struct setting unixtime_setting __setting ( SETTING_MISC, unixtime ) = {
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+	.name = "unixtime",
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+	.description = "Seconds since the Epoch",
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+	.type = &setting_type_uint32,
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+	.scope = &builtin_scope,
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+};
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+
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+/** Current time built-in setting */
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+struct builtin_setting unixtime_builtin_setting __builtin_setting = {
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+	.setting = &unixtime_setting,
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+	.fetch = unixtime_fetch,
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+};
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+
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 /**
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  * Fetch built-in setting
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  *

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