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/* (C) Copyright 2003 - 2010 Matthias Andree. See COPYING for license. */
#include "leafnode.h"
#include <string.h>
#include "fetchnews.h"
#include "system.h"
#include "ln_log.h"
/* send DATE command to upstream server and complain if the clocks are
* more than 15 minutes apart.
*/
void
check_date(const struct server *current_server)
{
int reply;
struct tm tm;
time_t t, to;
const int tolerate = 10;
const char *lastline;
strcpy(lineout, "DATE\r\n");
putaline();
reply = nntpreply(current_server);
if (reply != 111) {
/* upstream does not support the DATE command, so ignore */
if (debugmode) {
syslog(LOG_DEBUG, "check_date: %s: does not support DATE, "
"reply %d, expected 111", current_server->name, reply);
}
return;
}
lastline = lastreply();
if (lastline == NULL) {
ln_log(LNLOG_SWARNING, LNLOG_CTOP,
"%s: warning: server disconnect or timeout in response to DATE command",
current_server->name);
return;
}
/* upstream supports the DATE command */
if (sscanf(lastline, "%*d %4d%2d%2d%2d%2d%2d",
&tm.tm_year, &tm.tm_mon, &tm.tm_mday,
&tm.tm_hour, &tm.tm_min, &tm.tm_sec) < 6) {
/* too few fields */
ln_log(LNLOG_SINFO, LNLOG_CSERVER, "%s: check_date: too few fields in successful DATE reply "
"\"%s\"", current_server->name, lastline);
return;
}
/* we can match 6 fields, parse date */
tm.tm_year -= 1900;
tm.tm_mon -= 1;
tm.tm_isdst = -1; /* let libc figure time zone offset */
t = timegm(&tm);
if (t == (time_t) -1) {
/* error, ignore */
ln_log(LNLOG_SINFO, LNLOG_CSERVER, "%s: check_date: upstream sent unparsable reply "
"to DATE, mktime failed. \"%s\"", current_server->name, lastline);
return;
}
if (labs((long)(t - time(&to))) > tolerate * 60
#if SIZEOF_TIME_T >= SIZEOF_LONG
|| t - to > LONG_MAX || to - t > LONG_MAX
#endif
) {
syslog(LOG_WARNING, "check_date: %s: clocks of upstream and this computer are more than %d minutes apart. Check your system clock.", current_server->name, tolerate);
printf("check_date: %s: clocks of upstream and this computer are more than\n%d minutes apart. Check your system clock.\n", current_server->name, tolerate);
} else {
if (debugmode) {
syslog(LOG_DEBUG, "check_date: %s: server time %ld, our time %ld",
current_server->name, (long)t, (long)to);
}
}
}
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