net: make pinning enforcement timeout after ten weeks.

net/base/build_time.cc

+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "net/base/build_time.h"
+
+#include <stdlib.h>
+#include <string.h>
+
+#include "base/logging.h"
+#include "base/time.h"
+
+namespace net {
+
+int GetDaysSinceBuild() {
+  // The format of __DATE__ is specified by the ANSI C Standard, section 6.8.8.
+  // It is exactly "Mth DD YYYY".

[wtc, 2011/11/08 19:43:40]

Nit: Mth => Mmm ?

Mth seems to suggest that we should say "5th" for May.
(I guess "Mth" is short for "Month".)

+  char build_date[] = __DATE__;
+
+  // We can't use strptime because strptime will use the current locale, while
+  // the format of __DATE__ is locale independent.
+  static const char kMonths[12][4] = {
+    "Jan", "Feb", "Mar", "Apr", "May", "Jun",
+    "Jul", "Aug", "Sep", "Oct", "Nov", "Dec",
+  };
+
+  build_date[3] = 0;
+  build_date[6] = 0;

[wtc, 2011/11/08 19:43:40]

Nit: use '\0' instead of 0 in these two assignments.

+  int year = atoi(&build_date[7]);
+  DCHECK_GE(year, 2011);
+  DCHECK_LT(year, 3000);
+
+  int day = atoi(&build_date[4]);
+  DCHECK_GE(day, 1);
+  DCHECK_LT(day, 32);
+  int month;
+
+  for (month = 1; month <= 12; month++) {
+    if (memcmp(build_date, kMonths[month - 1], 3) == 0) {
+      break;
+    }
+  }
+  DCHECK_GE(month, 1);
+  DCHECK_LT(month, 13);
+
+  base::Time::Exploded build_time_exploded;
+  build_time_exploded.year = year;
+  build_time_exploded.month = month;
+  build_time_exploded.day_of_week = 0;
+  build_time_exploded.day_of_month = day;
+  build_time_exploded.hour = 22;  // 2PM PST
+  build_time_exploded.minute = 0;
+  build_time_exploded.second = 0;
+  build_time_exploded.millisecond = 0;
+
+  const base::Time build_time =
+      base::Time::FromUTCExploded(build_time_exploded);
+  const base::Time now = base::Time::Now();
+  if (now < build_time) {
+    // System clock is wrong or we built today.
+    return 0;
+  }
+  const base::TimeDelta delta = now - build_time;
+  return delta.InDays();
+}
+
+}  // namespace net
+