vsftpd/0017-Fix-an-issue-with-timestamps-during-DST.patch

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From 5ec0b86e5c1ff060720b5a6cd1af9d93ec993650 Mon Sep 17 00:00:00 2001
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From: Martin Sehnoutka <msehnout@redhat.com>
2016-11-17 13:35:34 +00:00
Date: Thu, 29 Sep 2016 11:14:03 +0200
Subject: [PATCH 17/59] Fix an issue with timestamps during DST.
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vsftpd now checks whether a file was uploaded during DST and
adjust the timestamp accordingly.
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---
sysutil.c | 104 ++++++++++++++++++++++++++++++++++++++++++++++----------------
1 file changed, 77 insertions(+), 27 deletions(-)
diff --git a/sysutil.c b/sysutil.c
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index c848356..2abdd13 100644
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--- a/sysutil.c
+++ b/sysutil.c
@@ -26,8 +26,10 @@
/* For Linux, this adds nothing :-) */
#include "port/porting_junk.h"
+#define F_LOCALTIME "/etc/localtime"
+#define BUFTZSIZ 64
+
#include <signal.h>
-#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
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@@ -56,6 +58,11 @@
#include <netdb.h>
#include <sys/resource.h>
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+#ifndef __USE_GNU
+ #define __USE_GNU
+#endif
+#include <string.h>
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+
/* Private variables to this file */
/* Current umask() */
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static unsigned int s_current_umask;
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@@ -2574,49 +2581,92 @@ error:
die("reopening standard file descriptors to /dev/null failed");
}
+char* vsf_sysutil_get_tz()
+{
+ char *ret_tz = NULL;
+ char buff[BUFTZSIZ];
+ off_t s_pos, e_pos;
+ size_t rcnt, rest;
+ int fd;
+
+ if ((fd = open(F_LOCALTIME, O_RDONLY)) > -1)
+ {
+ if ((e_pos = lseek(fd, 0, SEEK_END)) <= 0)
+ {
+ close(fd);
+ return NULL;
+ }
+ s_pos = e_pos > BUFTZSIZ ? e_pos - BUFTZSIZ : 0;
+ lseek(fd, s_pos, SEEK_SET);
+ rcnt = read(fd, buff, BUFTZSIZ);
+
+ if (rcnt && buff[rcnt-1] == '\n')
+ {
+ buff[rcnt-1] = 0;
+ e_pos--;
+ }
+
+ do {
+ char *nl = memrchr(buff, '\n', rcnt);
+ if (rcnt && nl)
+ {
+ int offset = (++nl) - buff;
+ int len = e_pos - s_pos - offset;
+ if (len)
+ {
+ lseek(fd, s_pos + offset, SEEK_SET);
+ ret_tz = calloc(1, len+4);
+ memcpy(ret_tz, "TZ=", 3);
+ rcnt = read(fd, ret_tz+3, len);
+ }
+ break;
+ }
+ if (!s_pos)
+ {
+ break;
+ }
+ rest = s_pos > BUFTZSIZ ? s_pos - BUFTZSIZ : 0;
+ s_pos -= rest;
+ lseek(fd, s_pos, SEEK_SET);
+ rcnt = read(fd, buff, rest);
+ } while (rcnt > 0);
+
+ close (fd);
+ }
+
+ return ret_tz;
+}
+
void
vsf_sysutil_tzset(void)
{
int retval;
- char tzbuf[sizeof("+HHMM!")];
+ char *tz=NULL, tzbuf[sizeof("+HHMM!")];
time_t the_time = time(NULL);
struct tm* p_tm;
+
+ /* Set our timezone in the TZ environment variable to cater for the fact
+ * that modern glibc does not cache /etc/localtime (which becomes inaccessible
+ * when we chroot().
+ */
+ tz = vsf_sysutil_get_tz();;
+ if (tz)
+ {
+ putenv(tz);
+ }
tzset();
p_tm = localtime(&the_time);
if (p_tm == NULL)
{
die("localtime");
}
- /* Set our timezone in the TZ environment variable to cater for the fact
- * that modern glibc does not cache /etc/localtime (which becomes inaccessible
- * when we chroot().
- */
retval = strftime(tzbuf, sizeof(tzbuf), "%z", p_tm);
tzbuf[sizeof(tzbuf) - 1] = '\0';
if (retval == 5)
{
- /* Static because putenv() does not copy the string. */
- static char envtz[sizeof("TZ=UTC-hh:mm")];
- /* Insert a colon so we have e.g. -05:00 instead of -0500 */
- tzbuf[5] = tzbuf[4];
- tzbuf[4] = tzbuf[3];
- tzbuf[3] = ':';
- /* Invert the sign - we just got the offset _from_ UTC but for TZ, we need
- * the offset _to_ UTC.
- */
- if (tzbuf[0] == '+')
- {
- tzbuf[0] = '-';
- }
- else
- {
- tzbuf[0] = '+';
- }
- snprintf(envtz, sizeof(envtz), "TZ=UTC%s", tzbuf);
- putenv(envtz);
s_timezone = ((tzbuf[1] - '0') * 10 + (tzbuf[2] - '0')) * 60 * 60;
- s_timezone += ((tzbuf[4] - '0') * 10 + (tzbuf[5] - '0')) * 60;
- if (tzbuf[0] == '-')
+ s_timezone += ((tzbuf[3] - '0') * 10 + (tzbuf[4] - '0')) * 60;
+ if (tzbuf[0] == '+')
{
s_timezone *= -1;
}
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--
2.14.4
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