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solanum-vs-hackint-and-char.../ircd/listener.c

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/*
* ircd-ratbox: A slightly useful ircd.
* listener.c: Listens on a port.
*
* Copyright (C) 1990 Jarkko Oikarinen and University of Oulu, Co Center
* Copyright (C) 1996-2002 Hybrid Development Team
* Copyright (C) 2002-2005 ircd-ratbox development team
* Copyright (C) 2021 Ariadne Conill
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
* USA
*/
#include "stdinc.h"
#include "setup.h"
#include "listener.h"
#include "client.h"
#include "match.h"
#include "ircd.h"
#include "ircd_defs.h"
#include "numeric.h"
#include "s_conf.h"
#include "s_newconf.h"
#include "s_stats.h"
#include "send.h"
#include "authproc.h"
#include "reject.h"
#include "hostmask.h"
#include "sslproc.h"
#include "wsproc.h"
#include "hash.h"
#include "s_assert.h"
#include "logger.h"
static rb_dlink_list listener_list = {};
static int accept_precallback(rb_fde_t *F, struct sockaddr *addr, rb_socklen_t addrlen, void *data);
static void accept_callback(rb_fde_t *F, int status, struct sockaddr *addr, rb_socklen_t addrlen, void *data);
static SSL_OPEN_CB accept_sslcallback;
static struct Listener *
make_listener(struct rb_sockaddr_storage *addr)
{
struct Listener *listener = (struct Listener *) rb_malloc(sizeof(struct Listener));
s_assert(0 != listener);
listener->name = me.name;
listener->F = NULL;
memcpy(&listener->addr, addr, sizeof(listener->addr));
return listener;
}
void
free_listener(struct Listener *listener)
{
s_assert(NULL != listener);
if(listener == NULL)
return;
rb_dlinkDelete(&listener->lnode, &listener_list);
rb_free(listener);
}
#define PORTNAMELEN 6 /* ":31337" */
/*
* get_listener_port - return displayable listener port
*/
static uint16_t
get_listener_port(const struct Listener *listener)
{
return ntohs(GET_SS_PORT(&listener->addr[0]));
}
/*
* get_listener_name - return displayable listener name and port
*/
const char *
get_listener_name(const struct Listener *listener)
{
static char buf[BUFSIZE];
snprintf(buf, sizeof(buf), "%s[%s/%u]",
me.name, listener->name, get_listener_port(listener));
return buf;
}
/*
* show_ports - send port listing to a client
* inputs - pointer to client to show ports to
* output - none
* side effects - show ports
*/
void
show_ports(struct Client *source_p)
{
rb_dlink_node *n;
RB_DLINK_FOREACH(n, listener_list.head)
{
struct Listener *listener = n->data;
sendto_one_numeric(source_p, RPL_STATSPLINE,
form_str(RPL_STATSPLINE), 'P',
get_listener_port(listener),
IsOperAdmin(source_p) ? listener->name : me.name,
listener->ref_count, (listener->active) ? "active" : "disabled",
listener->sctp ? " sctp" : " tcp",
listener->ssl ? " ssl" : "");
}
}
/*
* inetport - create a listener socket in the AF_INET or AF_INET6 domain,
* bind it to the port given in 'port' and listen to it
* returns true (1) if successful false (0) on error.
*/
static int
inetport(struct Listener *listener)
{
rb_fde_t *F;
const char *errstr;
int ret;
if (listener->sctp) {
#ifdef HAVE_LIBSCTP
/* only AF_INET6 sockets can have both AF_INET and AF_INET6 addresses */
F = rb_socket(AF_INET6, SOCK_STREAM, IPPROTO_SCTP, "Listener socket");
#else
F = NULL;
#endif
} else {
F = rb_socket(GET_SS_FAMILY(&listener->addr[0]), SOCK_STREAM, IPPROTO_TCP, "Listener socket");
}
memset(listener->vhost, 0, sizeof(listener->vhost));
if (GET_SS_FAMILY(&listener->addr[0]) == AF_INET6) {
struct sockaddr_in6 *in6 = (struct sockaddr_in6 *)&listener->addr[0];
rb_inet_ntop(AF_INET6, &in6->sin6_addr, listener->vhost, sizeof(listener->vhost));
} else if (GET_SS_FAMILY(&listener->addr[0]) == AF_INET) {
struct sockaddr_in *in = (struct sockaddr_in *)&listener->addr[0];
rb_inet_ntop(AF_INET, &in->sin_addr, listener->vhost, sizeof(listener->vhost));
}
if (GET_SS_FAMILY(&listener->addr[1]) == AF_INET6) {
struct sockaddr_in6 *in6 = (struct sockaddr_in6 *)&listener->addr[1];
strncat(listener->vhost, "&", sizeof(listener->vhost));
rb_inet_ntop(AF_INET6, &in6->sin6_addr, &listener->vhost[strlen(listener->vhost)], sizeof(listener->vhost) - strlen(listener->vhost));
} else if (GET_SS_FAMILY(&listener->addr[1]) == AF_INET) {
struct sockaddr_in *in = (struct sockaddr_in *)&listener->addr[1];
strncat(listener->vhost, "&", sizeof(listener->vhost));
rb_inet_ntop(AF_INET, &in->sin_addr, &listener->vhost[strlen(listener->vhost)], sizeof(listener->vhost) - strlen(listener->vhost));
}
if (listener->vhost[0] != '\0') {
listener->name = listener->vhost;
}
if (F == NULL) {
sendto_realops_snomask(SNO_GENERAL, L_NETWIDE,
"Cannot open socket for listener on %s port %d",
listener->sctp ? "SCTP" : "TCP",
get_listener_port(listener));
ilog(L_MAIN, "Cannot open socket for %s listener %s",
listener->sctp ? "SCTP" : "TCP",
get_listener_name(listener));
return 0;
}
if (listener->sctp) {
ret = rb_sctp_bindx(F, listener->addr, ARRAY_SIZE(listener->addr));
} else {
ret = rb_bind(F, (struct sockaddr *)&listener->addr[0]);
}
if (ret) {
errstr = strerror(rb_get_sockerr(F));
sendto_realops_snomask(SNO_GENERAL, L_NETWIDE,
"Cannot bind for listener on %s port %d: %s",
listener->sctp ? "SCTP" : "TCP",
get_listener_port(listener), errstr);
ilog(L_MAIN, "Cannot bind for %s listener %s: %s",
listener->sctp ? "SCTP" : "TCP",
get_listener_name(listener), errstr);
rb_close(F);
return 0;
}
if(rb_listen(F, SOMAXCONN, listener->defer_accept))
{
errstr = strerror(rb_get_sockerr(F));
sendto_realops_snomask(SNO_GENERAL, L_NETWIDE,
"Cannot listen() for listener on %s port %d: %s",
listener->sctp ? "SCTP" : "TCP",
get_listener_port(listener), errstr);
ilog(L_MAIN, "Cannot listen() for %s listener %s: %s",
listener->sctp ? "SCTP" : "TCP",
get_listener_name(listener), errstr);
rb_close(F);
return 0;
}
listener->F = F;
rb_accept_tcp(listener->F, accept_precallback, accept_callback, listener);
return 1;
}
static struct Listener *
find_listener(struct rb_sockaddr_storage *addr, int sctp)
{
rb_dlink_node *n;
struct Listener *last_closed = NULL;
RB_DLINK_FOREACH(n, listener_list.head) {
struct Listener *listener = n->data;
if (listener->sctp != sctp)
continue;
for (int i = 0; i < ARRAY_SIZE(listener->addr); i++) {
if (GET_SS_FAMILY(&addr[i]) != GET_SS_FAMILY(&listener->addr[i]))
goto next;
switch (GET_SS_FAMILY(&addr[i])) {
case AF_INET:
{
struct sockaddr_in *in4 = (struct sockaddr_in *)&addr[i];
struct sockaddr_in *lin4 = (struct sockaddr_in *)&listener->addr[i];
if(in4->sin_addr.s_addr != lin4->sin_addr.s_addr ||
in4->sin_port != lin4->sin_port)
{
goto next;
}
break;
}
case AF_INET6:
{
struct sockaddr_in6 *in6 = (struct sockaddr_in6 *)&addr[i];
struct sockaddr_in6 *lin6 =(struct sockaddr_in6 *)&listener->addr[i];
if (!IN6_ARE_ADDR_EQUAL(&in6->sin6_addr, &lin6->sin6_addr) ||
in6->sin6_port != lin6->sin6_port)
{
goto next;
}
break;
}
default:
break;
}
}
if (listener->F == NULL) {
last_closed = listener;
} else {
return listener;
}
next:
continue;
}
return last_closed;
}
/*
* add_tcp_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_tcp_listener(int port, const char *vhost_ip, int family, int ssl, int defer_accept, int wsock)
{
struct Listener *listener;
struct rb_sockaddr_storage vaddr[ARRAY_SIZE(listener->addr)];
/*
* if no port in conf line, don't bother
*/
if (port == 0)
return;
memset(&vaddr, 0, sizeof(vaddr));
SET_SS_FAMILY(&vaddr[0], AF_UNSPEC);
SET_SS_LEN(&vaddr[0], sizeof(struct sockaddr_storage));
SET_SS_FAMILY(&vaddr[1], AF_UNSPEC);
SET_SS_LEN(&vaddr[1], sizeof(struct sockaddr_storage));
if (vhost_ip != NULL) {
if (family == AF_INET) {
if (rb_inet_pton(family, vhost_ip, &((struct sockaddr_in *)&vaddr[0])->sin_addr) <= 0)
return;
} else {
if (rb_inet_pton(family, vhost_ip, &((struct sockaddr_in6 *)&vaddr[0])->sin6_addr) <= 0)
return;
}
} else {
switch(family) {
case AF_INET:
((struct sockaddr_in *)&vaddr[0])->sin_addr.s_addr = INADDR_ANY;
break;
case AF_INET6:
memcpy(&((struct sockaddr_in6 *)&vaddr[0])->sin6_addr, &in6addr_any, sizeof(struct in6_addr));
break;
default:
return;
}
}
switch(family) {
case AF_INET:
SET_SS_LEN(&vaddr[0], sizeof(struct sockaddr_in));
SET_SS_FAMILY(&vaddr[0], AF_INET);
SET_SS_PORT(&vaddr[0], htons(port));
break;
case AF_INET6:
SET_SS_LEN(&vaddr[0], sizeof(struct sockaddr_in6));
SET_SS_FAMILY(&vaddr[0], AF_INET6);
SET_SS_PORT(&vaddr[0], htons(port));
break;
default:
break;
}
if ((listener = find_listener(vaddr, 0))) {
if (listener->F != NULL)
return;
} else {
listener = make_listener(vaddr);
rb_dlinkAdd(listener, &listener->lnode, &listener_list);
}
listener->F = NULL;
listener->ssl = ssl;
listener->defer_accept = defer_accept;
listener->sctp = 0;
listener->wsock = wsock;
if (inetport(listener)) {
listener->active = 1;
} else {
close_listener(listener);
}
}
/*
* add_sctp_listener- create a new listener
* port - the port number to listen on
* vhost_ip1/2 - if non-null must contain a valid IP address string
*/
void
add_sctp_listener(int port, const char *vhost_ip1, const char *vhost_ip2, int ssl, int wsock)
{
struct Listener *listener;
struct rb_sockaddr_storage vaddr[ARRAY_SIZE(listener->addr)];
/*
* if no port in conf line, don't bother
*/
if (port == 0)
return;
memset(&vaddr, 0, sizeof(vaddr));
if (vhost_ip1 != NULL) {
if (rb_inet_pton_sock(vhost_ip1, &vaddr[0]) <= 0)
return;
if (vhost_ip2 != NULL) {
if (rb_inet_pton_sock(vhost_ip2, &vaddr[1]) <= 0)
return;
} else {
SET_SS_FAMILY(&vaddr[1], AF_UNSPEC);
SET_SS_LEN(&vaddr[1], sizeof(struct sockaddr_storage));
}
if (GET_SS_FAMILY(&vaddr[0]) == AF_INET && GET_SS_FAMILY(&vaddr[1]) == AF_INET6) {
/* always put INET6 first */
struct rb_sockaddr_storage tmp;
tmp = vaddr[0];
vaddr[0] = vaddr[1];
vaddr[1] = tmp;
}
} else {
memcpy(&((struct sockaddr_in6 *)&vaddr[0])->sin6_addr, &in6addr_any, sizeof(struct in6_addr));
SET_SS_FAMILY(&vaddr[0], AF_INET6);
SET_SS_LEN(&vaddr[0], sizeof(struct sockaddr_in6));
SET_SS_FAMILY(&vaddr[1], AF_UNSPEC);
SET_SS_LEN(&vaddr[1], sizeof(struct sockaddr_storage));
}
SET_SS_PORT(&vaddr[0], htons(port));
SET_SS_PORT(&vaddr[1], htons(port));
if ((listener = find_listener(vaddr, 1))) {
if(listener->F != NULL)
return;
} else {
listener = make_listener(vaddr);
rb_dlinkAdd(listener, &listener->lnode, &listener_list);
}
listener->F = NULL;
listener->ssl = ssl;
listener->defer_accept = 0;
listener->sctp = 1;
listener->wsock = wsock;
if (inetport(listener)) {
listener->active = 1;
} else {
close_listener(listener);
}
}
/*
* close_listener - close a single listener
*/
void
close_listener(struct Listener *listener)
{
s_assert(listener != NULL);
if(listener == NULL)
return;
if(listener->F != NULL)
{
rb_close(listener->F);
listener->F = NULL;
}
listener->active = 0;
if(listener->ref_count)
return;
free_listener(listener);
}
/*
* close_listeners - close and free all listeners that are not being used
*/
void
close_listeners(void)
{
rb_dlink_node *n, *tn;
/*
* close all 'extra' listening ports we have
*/
RB_DLINK_FOREACH_SAFE(n, tn, listener_list.head)
{
struct Listener *listener = n->data;
close_listener(listener);
}
rb_close_pending_fds();
}
/*
* add_connection - creates a client which has just connected to us on
* the given fd. The sockhost field is initialized with the ip# of the host.
* The client is sent to the auth module for verification, and not put in
* any client list yet.
*/
static void
add_connection(struct Listener *listener, rb_fde_t *F, struct sockaddr *sai, struct sockaddr *lai)
{
struct Client *new_client;
bool defer = false;
s_assert(NULL != listener);
/*
* get the client socket name from the socket
* the client has already been checked out in accept_connection
*/
new_client = make_client(NULL);
new_client->localClient->F = F;
memcpy(&new_client->localClient->ip, sai, sizeof(struct rb_sockaddr_storage));
memcpy(&new_client->preClient->lip, lai, sizeof(struct rb_sockaddr_storage));
/*
* copy address to 'sockhost' as a string, copy it to host too
* so we have something valid to put into error messages...
*/
rb_inet_ntop_sock((struct sockaddr *)&new_client->localClient->ip, new_client->sockhost,
sizeof(new_client->sockhost));
rb_strlcpy(new_client->host, new_client->sockhost, sizeof(new_client->host));
if (listener->sctp) {
SetSCTP(new_client);
}
if (listener->ssl)
{
rb_fde_t *xF[2];
if(rb_socketpair(AF_UNIX, SOCK_STREAM, 0, &xF[0], &xF[1], "Incoming ssld Connection") == -1)
{
SetIOError(new_client);
exit_client(new_client, new_client, new_client, "Fatal Error");
return;
}
new_client->localClient->ssl_callback = accept_sslcallback;
defer = true;
new_client->localClient->ssl_ctl = start_ssld_accept(F, xF[1], connid_get(new_client)); /* this will close F for us */
if(new_client->localClient->ssl_ctl == NULL)
{
SetIOError(new_client);
exit_client(new_client, new_client, new_client, "Service Unavailable");
return;
}
F = xF[0];
new_client->localClient->F = F;
SetSSL(new_client);
SetSecure(new_client);
}
else
{
struct ConfItem *aconf;
aconf = find_conf_by_address(NULL, NULL, NULL, sai, CONF_SECURE | 1, sai->sa_family, NULL, NULL);
if (aconf != NULL)
SetSecure(new_client);
}
if (listener->wsock)
{
rb_fde_t *xF[2];
if(rb_socketpair(AF_UNIX, SOCK_STREAM, 0, &xF[0], &xF[1], "Incoming wsockd Connection") == -1)
{
SetIOError(new_client);
exit_client(new_client, new_client, new_client, "Fatal Error");
return;
}
new_client->localClient->ws_ctl = start_wsockd_accept(F, xF[1], connid_get(new_client)); /* this will close F for us */
if(new_client->localClient->ws_ctl == NULL)
{
SetIOError(new_client);
exit_client(new_client, new_client, new_client, "Service Unavailable");
return;
}
F = xF[0];
new_client->localClient->F = F;
}
new_client->localClient->listener = listener;
++listener->ref_count;
authd_initiate_client(new_client, defer);
}
static int
accept_sslcallback(struct Client *client_p, int status)
{
authd_deferred_client(client_p);
return 0; /* use default handler if status != RB_OK */
}
static int
accept_precallback(rb_fde_t *F, struct sockaddr *addr, rb_socklen_t addrlen, void *data)
{
struct Listener *listener = (struct Listener *)data;
char buf[BUFSIZE];
struct ConfItem *aconf;
static time_t last_oper_notice = 0;
int len;
static const char *toofast = "ERROR :Reconnecting too fast, throttled.\r\n";
static const unsigned char sslerrcode[] = {
// SSLv3.0 Fatal Alert: Access Denied
0x15, 0x03, 0x00, 0x00, 0x02, 0x02, 0x31
};
if(listener->ssl && (!ircd_ssl_ok || !get_ssld_count()))
{
rb_close(F);
return 0;
}
if((maxconnections - 10) < rb_get_fd(F)) /* XXX this is kinda bogus */
{
++ServerStats.is_ref;
/*
* slow down the whining to opers bit
*/
if((last_oper_notice + 20) <= rb_current_time())
{
sendto_realops_snomask(SNO_GENERAL, L_NETWIDE,
"All connections in use. (%s)",
get_listener_name(listener));
last_oper_notice = rb_current_time();
}
rb_write(F, "ERROR :All connections in use\r\n", 31);
rb_close(F);
return 0;
}
aconf = find_dline(addr, addr->sa_family);
if(aconf != NULL && (aconf->status & CONF_EXEMPTDLINE))
return 1;
/* Do an initial check we aren't connecting too fast or with too many
* from this IP... */
if(aconf != NULL)
{
ServerStats.is_ref++;
if(listener->ssl)
{
rb_write(F, sslerrcode, sizeof(sslerrcode));
}
else if(ConfigFileEntry.dline_with_reason)
{
len = snprintf(buf, sizeof(buf), "ERROR :*** Banned: %s\r\n", get_user_ban_reason(aconf));
if (len >= (int)(sizeof(buf)-1))
{
buf[sizeof(buf) - 3] = '\r';
buf[sizeof(buf) - 2] = '\n';
buf[sizeof(buf) - 1] = '\0';
}
rb_write(F, buf, strlen(buf));
}
else
{
strcpy(buf, "ERROR :You have been D-lined.\r\n");
rb_write(F, buf, strlen(buf));
}
rb_close(F);
return 0;
}
if(check_reject(F, addr)) {
/* Reject the connection without closing the socket
* because it is now on the delay_exit list. */
return 0;
}
if(throttle_add(addr))
{
rb_write(F, toofast, strlen(toofast));
rb_close(F);
return 0;
}
return 1;
}
static void
accept_callback(rb_fde_t *F, int status, struct sockaddr *addr, rb_socklen_t addrlen, void *data)
{
struct Listener *listener = data;
struct rb_sockaddr_storage lip;
unsigned int locallen = sizeof(struct rb_sockaddr_storage);
ServerStats.is_ac++;
if(getsockname(rb_get_fd(F), (struct sockaddr *) &lip, &locallen) < 0)
{
/* this can fail if the connection disappeared in the meantime */
rb_close(F);
return;
}
add_connection(listener, F, addr, (struct sockaddr *)&lip);
}
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