const char *
saddr_ntoa(struct sockaddr *sa)
{
return (sa == NULL) ? "?" : naddr_ntoa(S_ADDR(sa));
}
static int
inetport(struct Listener* listener)
{
struct irc_sockaddr lsin;
int fd;
int opt = 1;
/*
* At first, open a new socket
*/
fd = comm_open(DEF_FAM, SOCK_STREAM, 0, "Listener socket");
#ifdef IPV6
if (!IN6_ARE_ADDR_EQUAL((struct in6_addr *)&listener->addr, &in6addr_any))
{
#else
if (INADDR_ANY != listener->addr.sins.sin.s_addr)
{
#endif
inetntop(DEF_FAM, &IN_ADDR(listener->addr), listener->vhost, HOSTLEN);
listener->name = listener->vhost;
}
if (fd == -1)
{
report_error(L_ALL, "opening listener socket %s:%s",
get_listener_name(listener), errno);
return 0;
}
else if ((HARD_FDLIMIT - 10) < fd)
{
report_error(L_ALL, "no more connections left for listener %s:%s",
get_listener_name(listener), errno);
fd_close(fd);
return 0;
}
/*
* XXX - we don't want to do all this crap for a listener
* set_sock_opts(listener);
*/
if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (char*) &opt, sizeof(opt)))
{
report_error(L_ALL, "setting SO_REUSEADDR for listener %s:%s",
get_listener_name(listener), errno);
fd_close(fd);
return 0;
}
/*
* Bind a port to listen for new connections if port is non-null,
* else assume it is already open and try get something from it.
*/
memset(&lsin, 0, sizeof(struct irc_sockaddr));
S_FAM(lsin) = DEF_FAM;
copy_s_addr(S_ADDR(lsin), IN_ADDR(listener->addr));
S_PORT(lsin) = htons(listener->port);
if (bind(fd, (struct sockaddr*) &SOCKADDR(lsin),
sizeof(struct irc_sockaddr)))
{
report_error(L_ALL, "binding listener socket %s:%s",
get_listener_name(listener), errno);
fd_close(fd);
return 0;
}
if (listen(fd, HYBRID_SOMAXCONN)) {
report_error(L_ALL, "listen failed for %s:%s",
get_listener_name(listener), errno);
fd_close(fd);
return 0;
}
/*
* XXX - this should always work, performance will suck if it doesn't
*/
if (!set_non_blocking(fd))
report_error(L_ALL, NONB_ERROR_MSG, get_listener_name(listener), errno);
listener->fd = fd;
/* Listen completion events are READ events .. */
accept_connection(fd, listener);
return 1;
}
static struct Listener*
find_listener(int port, struct irc_inaddr *addr)
{
struct Listener* listener = NULL;
struct Listener* last_closed = NULL;
for (listener = ListenerPollList; listener; listener = listener->next)
{
if ( (port == listener->port) &&
(!memcmp(&PIN_ADDR(addr),
&IN_ADDR(listener->addr),
sizeof(struct irc_inaddr))))
{
/* Try to return an open listener, otherwise reuse a closed one */
if (listener->fd == -1)
last_closed = listener;
else
return listener;
}
}
return last_closed;
}
/*
* add_listener- create a new listener
* port - the port number to listen on
* vhost_ip - if non-null must contain a valid IP address string in
* the format "255.255.255.255"
*/
void
add_listener(int port, const char* vhost_ip)
{
struct Listener* listener;
struct irc_inaddr vaddr;
/*
* if no port in conf line, don't bother
*/
if (port == 0)
return;
#ifdef IPV6
copy_s_addr(IN_ADDR(vaddr), &in6addr_any);
#else
copy_s_addr(IN_ADDR(vaddr), INADDR_ANY);
#endif
if (vhost_ip)
{
if(inetpton(DEF_FAM, vhost_ip, &IN_ADDR(vaddr)) <= 0)
return;
}
if ((listener = find_listener(port, &vaddr)))
{
if (listener->fd > -1)
return;
}
else
{
listener = make_listener(port, &vaddr);
listener->next = ListenerPollList;
ListenerPollList = listener;
}
listener->fd = -1;
if (inetport(listener))
listener->active = 1;
else
close_listener(listener);
}
/*
* close_listener - close a single listener
*/
void close_listener(struct Listener* listener)
{
assert(listener != NULL);
if(listener == NULL)
return;
if (listener->fd >= 0)
{
fd_close(listener->fd);
listener->fd = -1;
}
listener->active = 0;
if (listener->ref_count)
return;
free_listener(listener);
}
static void
accept_connection(int pfd, void *data)
{
static time_t last_oper_notice = 0;
struct irc_sockaddr sai;
struct irc_inaddr addr;
int fd;
int pe;
struct Listener * listener = data;
assert(listener != NULL);
if(listener == NULL)
return;
/*
* There may be many reasons for error return, but
* in otherwise correctly working environment the
* probable cause is running out of file descriptors
* (EMFILE, ENFILE or others?). The man pages for
* accept don't seem to list these as possible,
* although it's obvious that it may happen here.
* Thus no specific errors are tested at this
* point, just assume that connections cannot
* be accepted until some old is closed first.
*/
fd = comm_accept(listener->fd, &sai);
copy_s_addr(IN_ADDR(addr), S_ADDR(sai));
#ifdef IPV6
if((IN6_IS_ADDR_V4MAPPED(&IN_ADDR2(addr))) ||
(IN6_IS_ADDR_V4COMPAT(&IN_ADDR2(addr))))
{
memmove(&addr.sins.sin.s_addr, addr.sins.sin6.s6_addr+12,
sizeof(struct in_addr));
sai.sins.sin.sin_family = AF_INET;
}
#endif
if (fd < 0)
{
/* Re-register a new IO request for the next accept .. */
comm_setselect(listener->fd, FDLIST_SERVICE, COMM_SELECT_READ,
accept_connection, listener, 0);
return;
}
/*
* check for connection limit
*/
if ((MAXCONNECTIONS - 10) < fd)
{
++ServerStats->is_ref;
/*
* slow down the whining to opers bit
*/
if((last_oper_notice + 20) <= CurrentTime)
{
sendto_realops_flags(UMODE_ALL, L_ALL,"All connections in use. (%s)",
get_listener_name(listener));
last_oper_notice = CurrentTime;
}
send(fd, "ERROR :All connections in use\r\n", 32, 0);
fd_close(fd);
/* Re-register a new IO request for the next accept .. */
comm_setselect(listener->fd, FDLIST_SERVICE, COMM_SELECT_READ,
accept_connection, listener, 0);
return;
}
/* Do an initial check we aren't connecting too fast or with too many
* from this IP... */
if ((pe = conf_connect_allowed(&addr, sai.sins.sin.sin_family)) != 0)
{
ServerStats->is_ref++;
/* XXX - this can only be BANNED_CLIENT? */
switch (pe)
{
case BANNED_CLIENT:
send(fd, DLINE_WARNING, sizeof(DLINE_WARNING)-1, 0);
break;
}
fd_close(fd);
/* Re-register a new IO request for the next accept .. */
comm_setselect(listener->fd, FDLIST_SERVICE, COMM_SELECT_READ,
accept_connection, listener, 0);
return;
}
ServerStats->is_ac++;
add_connection(listener, fd);
/* Re-register a new IO request for the next accept .. */
comm_setselect(listener->fd, FDLIST_SERVICE, COMM_SELECT_READ,
accept_connection, listener, 0);
}
const char *
saddr_ntoa(struct sockaddr_storage *ss)
{
return (ss == NULL) ? "?" : naddr_ntoa(S_ADDR(ss));
}
