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authorDavid Kalnischkies <kalnischkies@gmail.com>2010-06-09 10:52:45 +0200
committerDavid Kalnischkies <kalnischkies@gmail.com>2010-06-09 10:52:45 +0200
commit308b793694774eece8765d172b8e989d8ed29925 (patch)
treebad798009c7f2b857c060e299294f63eabc3b20f /apt-pkg/contrib/strutl.cc
parent1aa9b2974d33015102224ffb738b2e8e0a4bcb42 (diff)
parentb02fffa64833e1f8e2617669d89de0a6d0882747 (diff)
- backport forgotten Valid-Until patch from the obsolete experimental
branch to prevent replay attacks better, thanks to Thomas Viehmann for the initial patch! (Closes: #499897) * doc/apt.conf.5.xml: - document the new Valid-Until related options * apt-pkg/contrib/strutl.cc: - split StrToTime() into HTTP1.1 and FTP date parser methods and use strptime() instead of some self-made scanf mangling - use the portable timegm shown in his manpage instead of a strange looking code copycat from wget * ftparchive/writer.cc: - add ValidTime option to generate a Valid-Until header in Release file
Diffstat (limited to 'apt-pkg/contrib/strutl.cc')
-rw-r--r--apt-pkg/contrib/strutl.cc72
1 files changed, 52 insertions, 20 deletions
diff --git a/apt-pkg/contrib/strutl.cc b/apt-pkg/contrib/strutl.cc
index c7d63ce8a..160450366 100644
--- a/apt-pkg/contrib/strutl.cc
+++ b/apt-pkg/contrib/strutl.cc
@@ -827,34 +827,66 @@ static int MonthConv(char *Month)
}
}
/*}}}*/
-// timegm - Internal timegm function if gnu is not available /*{{{*/
+// timegm - Internal timegm if the gnu version is not available /*{{{*/
// ---------------------------------------------------------------------
-/* Ripped this evil little function from wget - I prefer the use of
- GNU timegm if possible as this technique will have interesting problems
- with leap seconds, timezones and other.
-
- Converts struct tm to time_t, assuming the data in tm is UTC rather
+/* Converts struct tm to time_t, assuming the data in tm is UTC rather
than local timezone (mktime assumes the latter).
-
- Contributed by Roger Beeman <beeman@cisco.com>, with the help of
- Mark Baushke <mdb@cisco.com> and the rest of the Gurus at CISCO. */
-
-/* Turned it into an autoconf check, because GNU is not the only thing which
- can provide timegm. -- 2002-09-22, Joel Baker */
-#ifndef HAVE_TIMEGM // Now with autoconf!
+ This function is a nonstandard GNU extension that is also present on
+ the BSDs and maybe other systems. For others we follow the advice of
+ the manpage of timegm and use his portable replacement. */
+#ifndef HAVE_TIMEGM
static time_t timegm(struct tm *t)
{
- time_t tl, tb;
-
- tl = mktime (t);
- if (tl == -1)
- return -1;
- tb = mktime (gmtime (&tl));
- return (tl <= tb ? (tl + (tl - tb)) : (tl - (tb - tl)));
+ char *tz = getenv("TZ");
+ setenv("TZ", "", 1);
+ tzset();
+ time_t ret = mktime(t);
+ if (tz)
+ setenv("TZ", tz, 1);
+ else
+ unsetenv("TZ");
+ tzset();
+ return ret;
}
#endif
/*}}}*/
+// FullDateToTime - Converts a HTTP1.1 full date strings into a time_t /*{{{*/
+// ---------------------------------------------------------------------
+/* tries to parses a full date as specified in RFC2616 Section 3.3.1
+ with one exception: All timezones (%Z) are accepted but the protocol
+ says that it MUST be GMT, but this one is equal to UTC which we will
+ encounter from time to time (e.g. in Release files) so we accept all
+ here and just assume it is GMT (or UTC) later on */
+bool RFC1123StrToTime(const char* const str,time_t &time)
+{
+ struct tm Tm;
+ // Sun, 06 Nov 1994 08:49:37 GMT ; RFC 822, updated by RFC 1123
+ if (strptime(str, "%a, %d %b %Y %H:%M:%S %Z", &Tm) == NULL &&
+ // Sunday, 06-Nov-94 08:49:37 GMT ; RFC 850, obsoleted by RFC 1036
+ strptime(str, "%A, %d-%b-%y %H:%M:%S %Z", &Tm) == NULL &&
+ // Sun Nov 6 08:49:37 1994 ; ANSI C's asctime() format
+ strptime(str, "%a %b %d %H:%M:%S %Y", &Tm) == NULL)
+ return false;
+
+ time = timegm(&Tm);
+ return true;
+}
+ /*}}}*/
+// FTPMDTMStrToTime - Converts a ftp modification date into a time_t /*{{{*/
+// ---------------------------------------------------------------------
+/* */
+bool FTPMDTMStrToTime(const char* const str,time_t &time)
+{
+ struct tm Tm;
+ // MDTM includes no whitespaces but recommend and ignored by strptime
+ if (strptime(str, "%Y %m %d %H %M %S", &Tm) == NULL)
+ return false;
+
+ time = timegm(&Tm);
+ return true;
+}
+ /*}}}*/
// StrToTime - Converts a string into a time_t /*{{{*/
// ---------------------------------------------------------------------
/* This handles all 3 populare time formats including RFC 1123, RFC 1036