/** Replacement for perror(). Record error to log. Send a copy to all
* *LOCAL* opers, but only if no errors were sent to them in the last
* 20 seconds.
* @param text A *format* string for outputting error. It must contain
* only two '%s', the first will be replaced by the sockhost from the
* cptr, and the latter will be taken from sys_errlist[errno].
* @param who The client associated with the error.
* @param err The errno value to display.
*/
void report_error(const char* text, const char* who, int err)
{
static time_t last_notice = 0;
int errtmp = errno; /* debug may change 'errno' */
const char* errmsg = (err) ? strerror(err) : "";
if (!errmsg)
errmsg = "Unknown error";
if (EmptyString(who))
who = "unknown";
sendto_opmask_butone_ratelimited(0, SNO_OLDSNO, &last_notice, text, who, errmsg);
log_write(LS_SOCKET, L_ERROR, 0, text, who, errmsg);
errno = errtmp;
}
/*
* ms_create - server message handler
*/
int ms_create(struct Client* cptr, struct Client* sptr, int parc, char* parv[])
{
time_t chanTS; /* channel creation time */
char *p; /* strtok state */
char *name; /* channel name */
struct Channel *chptr; /* channel */
struct JoinBuf join; /* join and create buffers */
struct JoinBuf create;
struct ModeBuf mbuf; /* a mode buffer */
int badop; /* a flag */
if (IsServer(sptr))
return protocol_violation(sptr,"%s tried to CREATE a channel", cli_name(sptr));
/* sanity checks: Only accept CREATE messages from servers */
if (parc < 3 || *parv[2] == '\0')
return need_more_params(sptr,"CREATE");
chanTS = atoi(parv[2]);
/* A create that didn't appear during a burst has that servers idea of
* the current time. Use it for lag calculations.
*/
if (!IsBurstOrBurstAck(sptr) && 0 != chanTS)
cli_serv(cli_user(sptr)->server)->lag = TStime() - chanTS;
/* If this server is >1 minute fast, warn */
if (TStime() - chanTS<-60)
{
static time_t rate;
sendto_opmask_butone_ratelimited(0, SNO_NETWORK, &rate,
"Timestamp drift from %C (%is); issuing "
"SETTIME to correct this",
cli_user(sptr)->server,
chanTS - TStime());
/* Now issue a SETTIME to resync. If we're in the wrong, our
* (RELIABLE_CLOCK) hub will bounce a SETTIME back to us.
*/
sendcmdto_prio_one(&me, CMD_SETTIME, cli_user(sptr)->server,
"%Tu %C", TStime(), cli_user(sptr)->server);
}
joinbuf_init(&join, sptr, cptr, JOINBUF_TYPE_JOIN, 0, 0);
joinbuf_init(&create, sptr, cptr, JOINBUF_TYPE_CREATE, 0, chanTS);
/* For each channel in the comma separated list: */
for (name = ircd_strtok(&p, parv[1], ","); name;
name = ircd_strtok(&p, 0, ",")) {
badop = 0;
if (IsLocalChannel(name))
continue;
if ((chptr = FindChannel(name)))
{
/* Is the remote server confused? */
if (find_member_link(chptr, sptr)) {
protocol_violation(sptr, "%s tried to CREATE a channel already joined (%s)", cli_name(sptr), chptr->chname);
continue;
}
/* Check if we need to bounce a mode */
if (TStime() - chanTS > TS_LAG_TIME ||
(chptr->creationtime && chanTS > chptr->creationtime &&
/* Accept CREATE for zannels. This is only really necessary on a network
with servers prior to 2.10.12.02: we just accept their TS and ignore
the fact that it was a zannel. The influence of this on a network
that is completely 2.10.12.03 or higher is neglectable: Normally
a server only sends a CREATE after first sending a DESTRUCT. Thus,
by receiving a CREATE for a zannel one of three things happened:
1. The DESTRUCT was sent during a net.break; this could mean that
our zannel is at the verge of expiring too, it should have been
destructed. It is correct to copy the newer TS now, all modes
already have been reset, so it will be as if it was destructed
and immediately recreated. In order to avoid desyncs of modes,
we don't accept a CREATE for channels that have +A set.
2. The DESTRUCT passed, then someone created the channel on our
side and left it again. In this situation we have a near
simultaneous creation on two servers; the person on our side
already left within the time span of a message propagation.
The channel will therefore be less than 48 hours old and no
'protection' is necessary.
3. The source server sent the CREATE while linking,
before it got the BURST for our zannel. If this
happens, we should reset the channel back to the old
timestamp. This can be distinguished from case #1 by
checking IsBurstOrBurstAck(cli_user(sptr)->server).
*/
!(chptr->users == 0 && !chptr->mode.apass[0]))) {
if (!IsBurstOrBurstAck(cli_user(sptr)->server)) {
modebuf_init(&mbuf, sptr, cptr, chptr,
(MODEBUF_DEST_SERVER | /* Send mode to server */
MODEBUF_DEST_HACK2 | /* Send a HACK(2) message */
MODEBUF_DEST_BOUNCE)); /* And bounce the mode */
modebuf_mode_client(&mbuf, MODE_ADD | MODE_CHANOP, sptr, MAXOPLEVEL + 1);
modebuf_flush(&mbuf);
badop = 1;
} else if (chanTS > chptr->creationtime + 4) {
/* If their handling of the BURST will lead to deopping the
* user, have the user join without getting ops (if the
* server's handling of the BURST keeps their ops, the channel
* will use our timestamp).
*/
badop = 1;
}
if (badop)
joinbuf_join(&join, chptr, 0);
}
}
else /* Channel doesn't exist: create it */
chptr = get_channel(sptr, name, CGT_CREATE);
if (!badop) {
/* Set (or correct) our copy of the TS */
chptr->creationtime = chanTS;
joinbuf_join(&create, chptr, CHFL_CHANOP);
}
}
joinbuf_flush(&join); /* flush out the joins and creates */
joinbuf_flush(&create);
return 0;
}