/*
* ms_gline - server message handler
*
* parv[0] = Sender prefix
* parv[1] = Target: server numeric
* parv[2] = (+|-)<G-line mask>
* parv[3] = G-line lifetime
*
* From Uworld:
*
* parv[4] = Comment
*
* From somewhere else:
*
* parv[4] = Last modification time
* parv[5] = Comment
*
*/
int
ms_gline(struct Client *cptr, struct Client *sptr, int parc, char *parv[])
{
struct Client *acptr = 0;
struct Gline *agline;
unsigned int flags = 0;
time_t expire_off, lastmod = 0;
char *mask = parv[2], *target = parv[1], *reason = "No reason";
if (*mask == '!')
{
mask++;
flags |= GLINE_OPERFORCE; /* assume oper had WIDE_GLINE */
}
if ((parc == 3 && *mask == '-') || parc == 5)
{
if (!find_conf_byhost(cli_confs(cptr), cli_name(sptr), CONF_UWORLD))
return need_more_params(sptr, "GLINE");
flags |= GLINE_FORCE;
}
else if (parc > 5)
lastmod = atoi(parv[4]);
else
return need_more_params(sptr, "GLINE");
if (parc > 4)
reason = parv[parc - 1];
if (IsServer(sptr))
flags |= GLINE_FORCE;
if (!(target[0] == '*' && target[1] == '\0')) {
if (!( (acptr = FindNServer(target)) ||
(acptr = SeekServer(target)) ) )
return 0; /* no such server */
if (!IsMe(acptr)) { /* manually propagate */
if (!lastmod)
sendcmdto_one(sptr, CMD_GLINE, acptr,
(parc == 3) ? "%s %s" : "%s %s %s :%s", target, mask,
parv[3], reason);
else
sendcmdto_one(sptr, CMD_GLINE, acptr, "%s %s%s %s %s :%s", target,
flags & GLINE_OPERFORCE ? "!" : "", mask, parv[3],
parv[4], reason);
return 0;
}
/* For asuka we don't want glines sent this way treated as local
* flags |= GLINE_LOCAL;
*/
}
if (*mask == '-')
mask++;
else if (*mask == '+') {
flags |= GLINE_ACTIVE;
mask++;
} else
flags |= GLINE_ACTIVE;
expire_off = parc < 5 ? 0 : atoi(parv[3]);
agline = gline_find(mask, GLINE_ANY | GLINE_EXACT);
if (agline) {
if (GlineIsLocal(agline) && !(flags & GLINE_LOCAL)) /* global over local */
gline_free(agline);
else if (!lastmod && ((flags & GLINE_ACTIVE) == GlineIsRemActive(agline)))
return gline_propagate(cptr, sptr, agline);
else if (!lastmod || GlineLastMod(agline) < lastmod) { /* new mod */
if (flags & GLINE_ACTIVE)
return gline_activate(cptr, sptr, agline, lastmod, flags);
else
return gline_deactivate(cptr, sptr, agline, lastmod, flags);
} else if (GlineLastMod(agline) == lastmod || IsBurstOrBurstAck(cptr))
return 0;
else
return gline_resend(cptr, agline); /* other server desynched WRT gline */
} else if (parc == 3 && !(flags & GLINE_ACTIVE)) {
/* U-lined server removing a G-line we don't have; propagate the removal
* anyway.
*/
if (!(flags & GLINE_LOCAL))
sendcmdto_serv_butone(sptr, CMD_GLINE, cptr, "* -%s", mask);
return 0;
} else if (parc < 5)
return need_more_params(sptr, "GLINE");
return gline_add(cptr, sptr, mask, reason, expire_off, lastmod, flags);
}
/** Check whether the introduction of a new server would cause a loop
* or be disallowed by leaf and hub configuration directives.
* @param[in] cptr Neighbor who sent the message.
* @param[in] sptr Client that originated the message.
* @param[out] ghost If non-NULL, receives ghost timestamp for new server.
* @param[in] host Name of new server.
* @param[in] numnick Numnick mask of new server.
* @param[in] timestamp Claimed link timestamp of new server.
* @param[in] hop Number of hops to the new server.
* @param[in] junction Non-zero if the new server is still bursting.
* @return CPTR_KILLED if \a cptr was SQUIT. 0 if some other server
* was SQUIT. 1 if the new server is allowed.
*/
static int
check_loop_and_lh(struct Client* cptr, struct Client *sptr, time_t *ghost, const char *host, const char *numnick, time_t timestamp, int hop, int junction)
{
struct Client* acptr;
struct Client* LHcptr = NULL;
struct ConfItem* lhconf;
enum lh_type active_lh_line = ALLOWED;
int ii;
if (ghost)
*ghost = 0;
/*
* Calculate type of connect limit and applicable config item.
*/
lhconf = find_conf_byname(cli_confs(cptr), cli_name(cptr), CONF_SERVER);
assert(lhconf != NULL);
if (ghost)
{
if (!feature_bool(FEAT_HUB))
for (ii = 0; ii <= HighestFd; ii++)
if (LocalClientArray[ii] && IsServer(LocalClientArray[ii])) {
active_lh_line = I_AM_NOT_HUB;
break;
}
}
else if (hop > lhconf->maximum)
{
/* Because "maximum" should be 0 for non-hub links, check whether
* there is a hub mask -- if not, complain that the server isn't
* allowed to hub.
*/
active_lh_line = lhconf->hub_limit ? MAX_HOPS_EXCEEDED : NOT_ALLOWED_TO_HUB;
}
else if (lhconf->hub_limit && match(lhconf->hub_limit, host))
{
struct Client *ac3ptr;
active_lh_line = NOT_ALLOWED_TO_HUB;
if (junction)
for (ac3ptr = sptr; ac3ptr != &me; ac3ptr = cli_serv(ac3ptr)->up)
if (IsJunction(ac3ptr)) {
LHcptr = ac3ptr;
break;
}
}
/*
* We want to find IsConnecting() and IsHandshake() too,
* use FindClient().
* The second finds collisions with numeric representation of existing
* servers - these shouldn't happen anymore when all upgraded to 2.10.
* -- Run
*/
while ((acptr = FindClient(host))
|| (numnick && (acptr = FindNServer(numnick))))
{
/*
* This link is trying feed me a server that I already have
* access through another path
*
* Do not allow Uworld to do this.
* Do not allow servers that are juped.
* Do not allow servers that have older link timestamps
* then this try.
* Do not allow servers that use the same numeric as an existing
* server, but have a different name.
*
* If my ircd.conf sucks, I can try to connect to myself:
*/
if (acptr == &me)
return exit_client_msg(cptr, cptr, &me, "nick collision with me (%s), check server number in M:?", host);
/*
* Detect wrong numeric.
*/
if (0 != ircd_strcmp(cli_name(acptr), host))
{
sendcmdto_serv_butone(&me, CMD_WALLOPS, cptr,
":SERVER Numeric Collision: %s != %s",
cli_name(acptr), host);
return exit_client_msg(cptr, cptr, &me,
"NUMERIC collision between %s and %s."
" Is your server numeric correct ?", host, cli_name(acptr));
}
/*
* Kill our try, if we had one.
*/
if (IsConnecting(acptr))
{
if (active_lh_line == ALLOWED && exit_client(cptr, acptr, &me,
"Just connected via another link") == CPTR_KILLED)
return CPTR_KILLED;
/*
* We can have only ONE 'IsConnecting', 'IsHandshake' or
* 'IsServer', because new 'IsConnecting's are refused to
* the same server if we already had it.
*/
break;
}
/*
* Avoid other nick collisions...
* This is a doubtful test though, what else would it be
* when it has a server.name ?
*/
else if (!IsServer(acptr) && !IsHandshake(acptr))
return exit_client_msg(cptr, cptr, &me,
"Nickname %s already exists!", host);
/*
* Our new server might be a juped server,
* or someone trying abuse a second Uworld:
*/
else if (IsServer(acptr) && (0 == ircd_strncmp(cli_info(acptr), "JUPE", 4) ||
find_conf_byhost(cli_confs(cptr), cli_name(acptr), CONF_UWORLD)))
{
if (!IsServer(sptr))
return exit_client(cptr, sptr, &me, cli_info(acptr));
sendcmdto_serv_butone(&me, CMD_WALLOPS, cptr,
":Received :%s SERVER %s from %s !?!",
NumServ(cptr), host, cli_name(cptr));
return exit_new_server(cptr, sptr, host, timestamp, "%s", cli_info(acptr));
}
/*
* Of course we find the handshake this link was before :)
*/
else if (IsHandshake(acptr) && acptr == cptr)
break;
/*
* Here we have a server nick collision...
* We don't want to kill the link that was last /connected,
* but we neither want to kill a good (old) link.
* Therefor we kill the second youngest link.
*/
if (1)
{
struct Client* c2ptr = 0;
struct Client* c3ptr = acptr;
struct Client* ac2ptr;
struct Client* ac3ptr;
/* Search youngest link: */
for (ac3ptr = acptr; ac3ptr != &me; ac3ptr = cli_serv(ac3ptr)->up)
if (cli_serv(ac3ptr)->timestamp > cli_serv(c3ptr)->timestamp)
c3ptr = ac3ptr;
if (IsServer(sptr))
{
for (ac3ptr = sptr; ac3ptr != &me; ac3ptr = cli_serv(ac3ptr)->up)
if (cli_serv(ac3ptr)->timestamp > cli_serv(c3ptr)->timestamp)
c3ptr = ac3ptr;
}
if (timestamp > cli_serv(c3ptr)->timestamp)
{
c3ptr = 0;
c2ptr = acptr; /* Make sure they differ */
}
/* Search second youngest link: */
for (ac2ptr = acptr; ac2ptr != &me; ac2ptr = cli_serv(ac2ptr)->up)
if (ac2ptr != c3ptr &&
cli_serv(ac2ptr)->timestamp >
(c2ptr ? cli_serv(c2ptr)->timestamp : timestamp))
c2ptr = ac2ptr;
if (IsServer(sptr))
{
for (ac2ptr = sptr; ac2ptr != &me; ac2ptr = cli_serv(ac2ptr)->up)
if (ac2ptr != c3ptr &&
cli_serv(ac2ptr)->timestamp >
(c2ptr ? cli_serv(c2ptr)->timestamp : timestamp))
c2ptr = ac2ptr;
}
if (c3ptr && timestamp > (c2ptr ? cli_serv(c2ptr)->timestamp : timestamp))
c2ptr = 0;
/* If timestamps are equal, decide which link to break
* by name.
*/
if ((c2ptr ? cli_serv(c2ptr)->timestamp : timestamp) ==
(c3ptr ? cli_serv(c3ptr)->timestamp : timestamp))
{
const char *n2, *n2up, *n3, *n3up;
if (c2ptr)
{
n2 = cli_name(c2ptr);
n2up = MyConnect(c2ptr) ? cli_name(&me) : cli_name(cli_serv(c2ptr)->up);
}
else
{
n2 = host;
n2up = IsServer(sptr) ? cli_name(sptr) : cli_name(&me);
}
if (c3ptr)
{
n3 = cli_name(c3ptr);
n3up = MyConnect(c3ptr) ? cli_name(&me) : cli_name(cli_serv(c3ptr)->up);
}
else
{
n3 = host;
n3up = IsServer(sptr) ? cli_name(sptr) : cli_name(&me);
}
if (strcmp(n2, n2up) > 0)
n2 = n2up;
if (strcmp(n3, n3up) > 0)
n3 = n3up;
if (strcmp(n3, n2) > 0)
{
ac2ptr = c2ptr;
c2ptr = c3ptr;
c3ptr = ac2ptr;
}
}
/* Now squit the second youngest link: */
if (!c2ptr)
return exit_new_server(cptr, sptr, host, timestamp,
"server %s already exists and is %ld seconds younger.",
host, (long)cli_serv(acptr)->timestamp - (long)timestamp);
else if (cli_from(c2ptr) == cptr || IsServer(sptr))
{
struct Client *killedptrfrom = cli_from(c2ptr);
if (active_lh_line != ALLOWED)
{
/*
* If the L: or H: line also gets rid of this link,
* we sent just one squit.
*/
if (LHcptr && a_kills_b_too(LHcptr, c2ptr))
break;
/*
* If breaking the loop here solves the L: or H:
* line problem, we don't squit that.
*/
if (cli_from(c2ptr) == cptr || (LHcptr && a_kills_b_too(c2ptr, LHcptr)))
active_lh_line = ALLOWED;
else
{
/*
* If we still have a L: or H: line problem,
* we prefer to squit the new server, solving
* loop and L:/H: line problem with only one squit.
*/
LHcptr = 0;
break;
}
}
/*
* If the new server was introduced by a server that caused a
* Ghost less then 20 seconds ago, this is probably also
* a Ghost... (20 seconds is more then enough because all
* SERVER messages are at the beginning of a net.burst). --Run
*/
if (CurrentTime - cli_serv(cptr)->ghost < 20)
{
killedptrfrom = cli_from(acptr);
if (exit_client(cptr, acptr, &me, "Ghost loop") == CPTR_KILLED)
return CPTR_KILLED;
}
else if (exit_client_msg(cptr, c2ptr, &me,
"Loop <-- %s (new link is %ld seconds younger)", host,
(c3ptr ? (long)cli_serv(c3ptr)->timestamp : timestamp) -
(long)cli_serv(c2ptr)->timestamp) == CPTR_KILLED)
return CPTR_KILLED;
/*
* Did we kill the incoming server off already ?
*/
if (killedptrfrom == cptr)
return 0;
}
else
{
if (active_lh_line != ALLOWED)
{
if (LHcptr && a_kills_b_too(LHcptr, acptr))
break;
if (cli_from(acptr) == cptr || (LHcptr && a_kills_b_too(acptr, LHcptr)))
active_lh_line = ALLOWED;
else
{
LHcptr = 0;
break;
}
}
/*
* We can't believe it is a lagged server message
* when it directly connects to us...
* kill the older link at the ghost, rather then
* at the second youngest link, assuming it isn't
* a REAL loop.
*/
if (ghost)
*ghost = CurrentTime; /* Mark that it caused a ghost */
if (exit_client(cptr, acptr, &me, "Ghost") == CPTR_KILLED)
return CPTR_KILLED;
break;
}
}
}
if (active_lh_line != ALLOWED)
{
if (!LHcptr)
LHcptr = sptr;
if (active_lh_line == MAX_HOPS_EXCEEDED)
{
return exit_client_msg(cptr, LHcptr, &me,
"Maximum hops exceeded for %s at %s",
cli_name(cptr), host);
}
else if (active_lh_line == NOT_ALLOWED_TO_HUB)
{
return exit_client_msg(cptr, LHcptr, &me,
"%s is not allowed to hub for %s",
cli_name(cptr), host);
}
else /* I_AM_NOT_HUB */
{
ServerStats->is_ref++;
return exit_client(cptr, LHcptr, &me, "I'm a leaf, define HUB");
}
}
return 1;
}
int
ms_mode(struct Client *cptr, struct Client *sptr, int parc, char *parv[])
{
struct Channel *chptr = 0;
struct ModeBuf mbuf;
struct Membership *member;
if (parc < 3)
return need_more_params(sptr, "MODE");
if (IsLocalChannel(parv[1]))
return 0;
if (!(chptr = FindChannel(parv[1])))
{
struct Client *acptr;
acptr = FindUser(parv[1]);
if (!acptr)
{
return 0;
}
else if (sptr != acptr)
{
sendwallto_group_butone(&me, WALL_WALLOPS, 0,
"MODE for User %s from %s!%s", parv[1],
cli_name(cptr), cli_name(sptr));
return 0;
}
return set_user_mode(cptr, sptr, parc, parv, ALLOWMODES_ANY);
}
ClrFlag(sptr, FLAG_TS8);
if (IsServer(sptr)) {
if (find_conf_byhost(cli_confs(cptr), cli_name(sptr), CONF_UWORLD))
modebuf_init(&mbuf, sptr, cptr, chptr,
(MODEBUF_DEST_CHANNEL | /* Send mode to clients */
MODEBUF_DEST_SERVER | /* Send mode to servers */
MODEBUF_DEST_HACK4)); /* Send a HACK(4) message */
else if (!feature_bool(FEAT_OPLEVELS))
modebuf_init(&mbuf, sptr, cptr, chptr,
(MODEBUF_DEST_CHANNEL | /* Send mode to clients */
MODEBUF_DEST_SERVER | /* Send mode to servers */
MODEBUF_DEST_HACK3)); /* Send a HACK(3) message */
else
/* Servers need to be able to op people who join using the Apass
* or upass, as well as people joining a zannel, therefore we do
* not generate HACK3 when oplevels are on. */
modebuf_init(&mbuf, sptr, cptr, chptr,
(MODEBUF_DEST_CHANNEL | /* Send mode to clients */
MODEBUF_DEST_SERVER)); /* Send mode to servers */
mode_parse(&mbuf, cptr, sptr, chptr, parc - 2, parv + 2,
(MODE_PARSE_SET | /* Set the mode */
MODE_PARSE_STRICT | /* Interpret it strictly */
MODE_PARSE_FORCE), /* And force it to be accepted */
NULL);
} else {
if (!(member = find_member_link(chptr, sptr)) || !IsChanOp(member)) {
modebuf_init(&mbuf, sptr, cptr, chptr,
(MODEBUF_DEST_SERVER | /* Send mode to server */
MODEBUF_DEST_HACK2 | /* Send a HACK(2) message */
MODEBUF_DEST_DEOP | /* Deop the source */
MODEBUF_DEST_BOUNCE)); /* And bounce the MODE */
mode_parse(&mbuf, cptr, sptr, chptr, parc - 2, parv + 2,
(MODE_PARSE_STRICT | /* Interpret it strictly */
MODE_PARSE_BOUNCE), /* And bounce the MODE */
member);
} else {
modebuf_init(&mbuf, sptr, cptr, chptr,
(MODEBUF_DEST_CHANNEL | /* Send mode to clients */
MODEBUF_DEST_SERVER)); /* Send mode to servers */
mode_parse(&mbuf, cptr, sptr, chptr, parc - 2, parv + 2,
(MODE_PARSE_SET | /* Set the mode */
MODE_PARSE_STRICT | /* Interpret it strictly */
MODE_PARSE_FORCE), /* And force it to be accepted */
member);
}
}
return modebuf_flush(&mbuf);
}
/** Read a 'packet' of data from a connection and process it. Read in
* 8k chunks to give a better performance rating (for server
* connections). Do some tricky stuff for client connections to make
* sure they don't do any flooding >:-) -avalon
* @param cptr Client from which to read data.
* @param socket_ready If non-zero, more data can be read from the client's socket.
* @return Positive number on success, zero on connection-fatal failure, negative
* if user is killed.
*/
static int read_packet(struct Client *cptr, int socket_ready)
{
unsigned int dolen = 0;
unsigned int length = 0;
if (socket_ready &&
!(IsUser(cptr) &&
DBufLength(&(cli_recvQ(cptr))) > feature_uint(FEAT_CLIENT_FLOOD))) {
#if defined(USE_SSL)
switch (client_recv(cptr, readbuf, sizeof(readbuf), &length)) {
#else
switch (os_recv_nonb(cli_fd(cptr), readbuf, sizeof(readbuf), &length)) {
#endif
case IO_SUCCESS:
if (length)
{
cli_lasttime(cptr) = CurrentTime;
ClearPingSent(cptr);
ClrFlag(cptr, FLAG_NONL);
if (cli_lasttime(cptr) > cli_since(cptr))
cli_since(cptr) = cli_lasttime(cptr);
}
break;
case IO_BLOCKED:
break;
case IO_FAILURE:
cli_error(cptr) = errno;
/* SetFlag(cptr, FLAG_DEADSOCKET); */
return 0;
}
}
/*
* For server connections, we process as many as we can without
* worrying about the time of day or anything :)
*/
if (length > 0 && IsServer(cptr))
return server_dopacket(cptr, readbuf, length);
else if (length > 0 && (IsHandshake(cptr) || IsConnecting(cptr)))
return connect_dopacket(cptr, readbuf, length);
else
{
/*
* Before we even think of parsing what we just read, stick
* it on the end of the receive queue and do it when its
* turn comes around.
*/
if (length > 0 && dbuf_put(cptr, &(cli_recvQ(cptr)), readbuf, length) == 0)
return exit_client(cptr, cptr, &me, "dbuf_put fail");
if ((DBufLength(&(cli_recvQ(cptr))) > feature_uint(FEAT_CLIENT_FLOOD))
&& !IsChannelService(cptr))
return exit_client(cptr, cptr, &me, "Excess Flood");
while (DBufLength(&(cli_recvQ(cptr))) && !NoNewLine(cptr) &&
(IsTrusted(cptr) || IsChannelService(cptr) || cli_since(cptr) - CurrentTime < 10))
{
dolen = dbuf_getmsg(&(cli_recvQ(cptr)), cli_buffer(cptr), BUFSIZE);
/*
* Devious looking...whats it do ? well..if a client
* sends a *long* message without any CR or LF, then
* dbuf_getmsg fails and we pull it out using this
* loop which just gets the next 512 bytes and then
* deletes the rest of the buffer contents.
* -avalon
*/
if (dolen == 0)
{
if (DBufLength(&(cli_recvQ(cptr))) < 510)
SetFlag(cptr, FLAG_NONL);
else
{
/* More than 512 bytes in the line - drop the input and yell
* at the client.
*/
DBufClear(&(cli_recvQ(cptr)));
send_reply(cptr, ERR_INPUTTOOLONG);
}
}
else if (client_dopacket(cptr, dolen) == CPTR_KILLED)
return CPTR_KILLED;
/*
* If it has become registered as a Server
* then skip the per-message parsing below.
*/
if (IsHandshake(cptr) || IsServer(cptr))
{
while (-1)
{
dolen = dbuf_get(&(cli_recvQ(cptr)), readbuf, sizeof(readbuf));
if (dolen <= 0)
return 1;
else if (dolen == 0)
{
if (DBufLength(&(cli_recvQ(cptr))) < 510)
SetFlag(cptr, FLAG_NONL);
else {
DBufClear(&(cli_recvQ(cptr)));
/* send_reply(cptr, ERR_INPUTTOOLONG); */
}
}
else if ((IsServer(cptr) &&
server_dopacket(cptr, readbuf, dolen) == CPTR_KILLED) ||
(!IsServer(cptr) &&
connect_dopacket(cptr, readbuf, dolen) == CPTR_KILLED))
return CPTR_KILLED;
}
}
}
/* If there's still data to process, wait 2 seconds first */
if (DBufLength(&(cli_recvQ(cptr))) && !NoNewLine(cptr) &&
!t_onqueue(&(cli_proc(cptr))))
{
Debug((DEBUG_LIST, "Adding client process timer for %C", cptr));
cli_freeflag(cptr) |= FREEFLAG_TIMER;
timer_add(&(cli_proc(cptr)), client_timer_callback, cli_connect(cptr),
TT_RELATIVE, 2);
}
}
return 1;
}
/** Start a connection to another server.
* @param aconf Connect block data for target server.
* @param by Client who requested the connection (if any).
* @return Non-zero on success; zero on failure.
*/
int connect_server(struct ConfItem* aconf, struct Client* by)
{
struct Client* cptr = 0;
assert(0 != aconf);
if (aconf->dns_pending) {
sendto_opmask(0, SNO_OLDSNO, "Server %s connect DNS pending",
aconf->name);
return 0;
}
Debug((DEBUG_NOTICE, "Connect to %s[@%s]", aconf->name,
ircd_ntoa(&aconf->address.addr)));
if ((cptr = FindClient(aconf->name))) {
if (IsServer(cptr) || IsMe(cptr)) {
sendto_opmask(0, SNO_OLDSNO, "Server %s already present from %s",
aconf->name, cli_name(cli_from(cptr)));
if (by && IsUser(by) && !MyUser(by)) {
sendcmdto_one(&me, CMD_NOTICE, by, "%C :Server %s already present "
"from %s", by, aconf->name, cli_name(cli_from(cptr)));
}
return 0;
}
else if (IsHandshake(cptr) || IsConnecting(cptr)) {
if (by && IsUser(by)) {
sendcmdto_one(&me, CMD_NOTICE, by, "%C :Connection to %s already in "
"progress", by, cli_name(cptr));
}
return 0;
}
}
/*
* If we don't know the IP# for this host and it is a hostname and
* not a ip# string, then try and find the appropriate host record.
*/
if (!irc_in_addr_valid(&aconf->address.addr)
&& !ircd_aton(&aconf->address.addr, aconf->host)) {
char buf[HOSTLEN + 1];
host_from_uh(buf, aconf->host, HOSTLEN);
gethost_byname(buf, connect_dns_callback, aconf);
aconf->dns_pending = 1;
return 0;
}
cptr = make_client(NULL, STAT_UNKNOWN_SERVER);
/*
* Copy these in so we have something for error detection.
*/
ircd_strncpy(cli_name(cptr), aconf->name, HOSTLEN);
ircd_strncpy(cli_sockhost(cptr), aconf->host, HOSTLEN);
/*
* Attach config entries to client here rather than in
* completed_connection. This to avoid null pointer references
*/
attach_confs_byhost(cptr, aconf->host, CONF_SERVER);
if (!find_conf_byhost(cli_confs(cptr), aconf->host, CONF_SERVER)) {
sendto_opmask(0, SNO_OLDSNO, "Host %s is not enabled for "
"connecting: no Connect block", aconf->name);
if (by && IsUser(by) && !MyUser(by)) {
sendcmdto_one(&me, CMD_NOTICE, by, "%C :Connect to host %s failed: no "
"Connect block", by, aconf->name);
}
det_confs_butmask(cptr, 0);
free_client(cptr);
return 0;
}
/*
* attempt to connect to the server in the conf line
*/
if (!connect_inet(aconf, cptr)) {
if (by && IsUser(by) && !MyUser(by)) {
sendcmdto_one(&me, CMD_NOTICE, by, "%C :Couldn't connect to %s", by,
cli_name(cptr));
}
det_confs_butmask(cptr, 0);
free_client(cptr);
return 0;
}
/*
* NOTE: if we're here we have a valid C:Line and the client should
* have started the connection and stored the remote address/port and
* ip address name in itself
*
* The socket has been connected or connect is in progress.
*/
make_server(cptr);
if (by && IsUser(by)) {
ircd_snprintf(0, cli_serv(cptr)->by, sizeof(cli_serv(cptr)->by), "%s%s",
NumNick(by));
assert(0 == cli_serv(cptr)->user);
cli_serv(cptr)->user = cli_user(by);
cli_user(by)->refcnt++;
}
else {
*(cli_serv(cptr))->by = '\0';
/* strcpy(cptr->serv->by, "Auto"); */
}
cli_serv(cptr)->up = &me;
SetConnecting(cptr);
if (cli_fd(cptr) > HighestFd)
HighestFd = cli_fd(cptr);
LocalClientArray[cli_fd(cptr)] = cptr;
Count_newunknown(UserStats);
/* Actually we lie, the connect hasn't succeeded yet, but we have a valid
* cptr, so we register it now.
* Maybe these two calls should be merged.
*/
add_client_to_list(cptr);
hAddClient(cptr);
/* nextping = CurrentTime; */
return (s_state(&cli_socket(cptr)) == SS_CONNECTED) ?
completed_connection(cptr) : 1;
}
/** Find the real hostname for the host running the server (or one which
* matches the server's name) and its primary IP#. Hostname is stored
* in the client structure passed as a pointer.
*/
void init_server_identity(void)
{
const struct LocalConf* conf = conf_get_local();
assert(0 != conf);
ircd_strncpy(cli_name(&me), conf->name, HOSTLEN);
SetYXXServerName(&me, conf->numeric);
}
/** Process events on a client socket.
* @param ev Socket event structure that has a struct Connection as
* its associated data.
*/
static void client_sock_callback(struct Event* ev)
{
struct Client* cptr;
struct Connection* con;
char *fmt = "%s";
char *fallback = 0;
assert(0 != ev_socket(ev));
assert(0 != s_data(ev_socket(ev)));
con = (struct Connection*) s_data(ev_socket(ev));
assert(0 != con_client(con) || ev_type(ev) == ET_DESTROY);
cptr = con_client(con);
assert(0 == cptr || con == cli_connect(cptr));
switch (ev_type(ev)) {
case ET_DESTROY:
con_freeflag(con) &= ~FREEFLAG_SOCKET;
if (!con_freeflag(con) && !cptr)
free_connection(con);
#if defined(USE_SSL)
ssl_free(ev_socket(ev));
#endif
break;
case ET_CONNECT: /* socket connection completed */
if (!completed_connection(cptr) || IsDead(cptr))
fallback = cli_info(cptr);
break;
case ET_ERROR: /* an error occurred */
fallback = cli_info(cptr);
cli_error(cptr) = ev_data(ev);
/* If the OS told us we have a bad file descriptor, we should
* record that for future reference.
*/
if (cli_error(cptr) == EBADF)
cli_fd(cptr) = -1;
if (s_state(&(con_socket(con))) == SS_CONNECTING) {
completed_connection(cptr);
/* for some reason, the os_get_sockerr() in completed_connection()
* can return 0 even when ev_data(ev) indicates a real error, so
* re-assign the client error here.
*/
cli_error(cptr) = ev_data(ev);
break;
}
/*FALLTHROUGH*/
case ET_EOF: /* end of file on socket */
Debug((DEBUG_ERROR, "READ ERROR: fd = %d %d", cli_fd(cptr),
cli_error(cptr)));
SetFlag(cptr, FLAG_DEADSOCKET);
if ((IsServer(cptr) || IsHandshake(cptr)) && cli_error(cptr) == 0) {
exit_client_msg(cptr, cptr, &me, "Server %s closed the connection (%s)",
cli_name(cptr), cli_serv(cptr)->last_error_msg);
return;
} else {
fmt = "Read error: %s";
fallback = "EOF from client";
}
break;
case ET_WRITE: /* socket is writable */
ClrFlag(cptr, FLAG_BLOCKED);
if (cli_listing(cptr) && MsgQLength(&(cli_sendQ(cptr))) < 2048)
list_next_channels(cptr);
Debug((DEBUG_SEND, "Sending queued data to %C", cptr));
send_queued(cptr);
break;
case ET_READ: /* socket is readable */
if (!IsDead(cptr)) {
Debug((DEBUG_DEBUG, "Reading data from %C", cptr));
if (read_packet(cptr, 1) == 0) /* error while reading packet */
fallback = "EOF from client";
}
break;
default:
assert(0 && "Unrecognized socket event in client_sock_callback()");
break;
}
assert(0 == cptr || 0 == cli_connect(cptr) || con == cli_connect(cptr));
if (fallback) {
const char* msg = (cli_error(cptr)) ? strerror(cli_error(cptr)) : fallback;
if (!msg)
msg = "Unknown error";
exit_client_msg(cptr, cptr, &me, fmt, msg);
}
}
/** Process a timer on client socket.
* @param ev Timer event that has a struct Connection as its
* associated data.
*/
static void client_timer_callback(struct Event* ev)
{
struct Client* cptr;
struct Connection* con;
assert(0 != ev_timer(ev));
assert(0 != t_data(ev_timer(ev)));
assert(ET_DESTROY == ev_type(ev) || ET_EXPIRE == ev_type(ev));
con = (struct Connection*) t_data(ev_timer(ev));
assert(0 != con_client(con) || ev_type(ev) == ET_DESTROY);
cptr = con_client(con);
assert(0 == cptr || con == cli_connect(cptr));
if (ev_type(ev)== ET_DESTROY) {
con_freeflag(con) &= ~FREEFLAG_TIMER; /* timer has expired... */
if (!con_freeflag(con) && !cptr)
free_connection(con); /* client is being destroyed */
} else {
Debug((DEBUG_LIST, "Client process timer for %C expired; processing",
cptr));
read_packet(cptr, 0); /* read_packet will re-add timer if needed */
}
assert(0 == cptr || 0 == cli_connect(cptr) || con == cli_connect(cptr));
}
/** Check access for a server given its name (passed in cptr struct).
* Must check for all C/N lines which have a name which matches the
* name given and a host which matches. A host alias which is the
* same as the server name is also acceptable in the host field of a
* C/N line.
* @param cptr Peer server to check.
* @return 0 if accepted, -1 if access denied.
*/
int conf_check_server(struct Client *cptr)
{
struct ConfItem* c_conf = NULL;
struct SLink* lp;
Debug((DEBUG_DNS, "sv_cl: check access for %s[%s]",
cli_name(cptr), cli_sockhost(cptr)));
if (IsUnknown(cptr) && !attach_confs_byname(cptr, cli_name(cptr), CONF_SERVER)) {
Debug((DEBUG_DNS, "No C/N lines for %s", cli_sockhost(cptr)));
return -1;
}
lp = cli_confs(cptr);
/*
* We initiated this connection so the client should have a C and N
* line already attached after passing through the connect_server()
* function earlier.
*/
if (IsConnecting(cptr) || IsHandshake(cptr)) {
c_conf = find_conf_byname(lp, cli_name(cptr), CONF_SERVER);
if (!c_conf) {
sendto_opmask_butone(0, SNO_OLDSNO,
"Connect Error: lost Connect block for %s",
cli_name(cptr));
det_confs_butmask(cptr, 0);
return -1;
}
}
/* Try finding the Connect block by DNS name and IP next. */
if (!c_conf && !(c_conf = find_conf_byhost(lp, cli_sockhost(cptr), CONF_SERVER)))
c_conf = find_conf_byip(lp, &cli_ip(cptr), CONF_SERVER);
/*
* Attach by IP# only if all other checks have failed.
* It is quite possible to get here with the strange things that can
* happen when using DNS in the way the irc server does. -avalon
*/
if (!c_conf)
c_conf = find_conf_byip(lp, &cli_ip(cptr), CONF_SERVER);
/*
* detach all conf lines that got attached by attach_confs()
*/
det_confs_butmask(cptr, 0);
/*
* if no Connect block, then deny access
*/
if (!c_conf) {
Debug((DEBUG_DNS, "sv_cl: access denied: %s[%s@%s]",
cli_name(cptr), cli_username(cptr), cli_sockhost(cptr)));
return -1;
}
/*
* attach the Connect block to the client structure for later use.
*/
attach_conf(cptr, c_conf);
if (!irc_in_addr_valid(&c_conf->address.addr))
memcpy(&c_conf->address.addr, &cli_ip(cptr), sizeof(c_conf->address.addr));
Debug((DEBUG_DNS, "sv_cl: access ok: %s[%s]",
cli_name(cptr), cli_sockhost(cptr)));
return 0;
}
/** Start a connection to another server.
* @param aconf Connect block data for target server.
* @param by Client who requested the connection (if any).
* @return Non-zero on success; zero on failure.
*/
int connect_server(struct ConfItem* aconf, struct Client* by)
{
struct Client* cptr = 0;
assert(0 != aconf);
if (aconf->dns_pending) {
sendto_opmask_butone(0, SNO_OLDSNO, "Server %s connect DNS pending",
aconf->name);
return 0;
}
Debug((DEBUG_NOTICE, "Connect to %s[@%s]", aconf->name,
ircd_ntoa(&aconf->address.addr)));
if ((cptr = FindClient(aconf->name))) {
if (IsServer(cptr) || IsMe(cptr)) {
sendto_opmask_butone(0, SNO_OLDSNO, "Server %s already present from %s",
aconf->name, cli_name(cli_from(cptr)));
if (by && IsUser(by) && !MyUser(by)) {
sendcmdto_one(&me, CMD_NOTICE, by, "%C :Server %s already present "
"from %s", by, aconf->name, cli_name(cli_from(cptr)));
}
return 0;
}
else if (IsHandshake(cptr) || IsConnecting(cptr)) {
if (by && IsUser(by)) {
sendcmdto_one(&me, CMD_NOTICE, by, "%C :Connection to %s already in "
"progress", by, cli_name(cptr));
}
return 0;
}
}
/*
* If we don't know the IP# for this host and it is a hostname and
* not a ip# string, then try and find the appropriate host record.
*/
if (!irc_in_addr_valid(&aconf->address.addr)
&& !ircd_aton(&aconf->address.addr, aconf->host)) {
char buf[HOSTLEN + 1];
host_from_uh(buf, aconf->host, HOSTLEN);
gethost_byname(buf, connect_dns_callback, aconf);
aconf->dns_pending = 1;
return 0;
}
cptr = make_client(NULL, STAT_UNKNOWN_SERVER);
/*
* Copy these in so we have something for error detection.
*/
ircd_strncpy(cli_name(cptr), aconf->name, HOSTLEN);
ircd_strncpy(cli_sockhost(cptr), aconf->host, HOSTLEN);
/*
* Attach config entries to client here rather than in
* completed_connection. This to avoid null pointer references
*/
attach_confs_byhost(cptr, aconf->host, CONF_SERVER);
if (!find_conf_byhost(cli_confs(cptr), aconf->host, CONF_SERVER)) {
sendto_opmask_butone(0, SNO_OLDSNO, "Host %s is not enabled for "
"connecting: no Connect block", aconf->name);
if (by && IsUser(by) && !MyUser(by)) {
sendcmdto_one(&me, CMD_NOTICE, by, "%C :Connect to host %s failed: no "
"Connect block", by, aconf->name);
}
det_confs_butmask(cptr, 0);
free_client(cptr);
return 0;
}
/*
* attempt to connect to the server in the conf line
*/
if (!connect_inet(aconf, cptr)) {
if (by && IsUser(by) && !MyUser(by)) {
sendcmdto_one(&me, CMD_NOTICE, by, "%C :Couldn't connect to %s", by,
cli_name(cptr));
}
det_confs_butmask(cptr, 0);
free_client(cptr);
return 0;
}
/*
* NOTE: if we're here we have a valid C:Line and the client should
* have started the connection and stored the remote address/port and
* ip address name in itself
*
* The socket has been connected or connect is in progress.
*/
make_server(cptr);
if (by && IsUser(by)) {
ircd_snprintf(0, cli_serv(cptr)->by, sizeof(cli_serv(cptr)->by), "%s%s",
NumNick(by));
assert(0 == cli_serv(cptr)->user);
cli_serv(cptr)->user = cli_user(by);
cli_user(by)->refcnt++;
}
else {
*(cli_serv(cptr))->by = '\0';
/* strcpy(cptr->serv->by, "Auto"); */
}
cli_serv(cptr)->up = &me;
SetConnecting(cptr);
if (cli_fd(cptr) > HighestFd)
HighestFd = cli_fd(cptr);
LocalClientArray[cli_fd(cptr)] = cptr;
Count_newunknown(UserStats);
/* Actually we lie, the connect hasn't succeeded yet, but we have a valid
* cptr, so we register it now.
* Maybe these two calls should be merged.
*/
add_client_to_list(cptr);
hAddClient(cptr);
/* nextping = CurrentTime; */
return (s_state(&cli_socket(cptr)) == SS_CONNECTED) ?
completed_connection(cptr) : 1;
}
