blob: 2b8d148d15fd37a957924976318c360a716ce0df [file] [log] [blame]
/*
* AF_INET/AF_INET6 SOCK_STREAM protocol layer (tcp)
*
* Copyright 2000-2010 Willy Tarreau <w@1wt.eu>
*
* 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.
*
*/
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <sys/param.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/un.h>
#include <netinet/tcp.h>
#include <common/cfgparse.h>
#include <common/compat.h>
#include <common/config.h>
#include <common/debug.h>
#include <common/errors.h>
#include <common/mini-clist.h>
#include <common/standard.h>
#include <types/global.h>
#include <types/server.h>
#include <proto/acl.h>
#include <proto/arg.h>
#include <proto/channel.h>
#include <proto/connection.h>
#include <proto/fd.h>
#include <proto/listener.h>
#include <proto/log.h>
#include <proto/port_range.h>
#include <proto/protocol.h>
#include <proto/proto_tcp.h>
#include <proto/proxy.h>
#include <proto/sample.h>
#include <proto/session.h>
#include <proto/stick_table.h>
#include <proto/task.h>
#ifdef CONFIG_HAP_CTTPROXY
#include <import/ip_tproxy.h>
#endif
static int tcp_bind_listeners(struct protocol *proto, char *errmsg, int errlen);
static int tcp_bind_listener(struct listener *listener, char *errmsg, int errlen);
/* Note: must not be declared <const> as its list will be overwritten */
static struct protocol proto_tcpv4 = {
.name = "tcpv4",
.sock_domain = AF_INET,
.sock_type = SOCK_STREAM,
.sock_prot = IPPROTO_TCP,
.sock_family = AF_INET,
.sock_addrlen = sizeof(struct sockaddr_in),
.l3_addrlen = 32/8,
.accept = &listener_accept,
.connect = tcp_connect_server,
.bind = tcp_bind_listener,
.bind_all = tcp_bind_listeners,
.unbind_all = unbind_all_listeners,
.enable_all = enable_all_listeners,
.get_src = tcp_get_src,
.get_dst = tcp_get_dst,
.listeners = LIST_HEAD_INIT(proto_tcpv4.listeners),
.nb_listeners = 0,
};
/* Note: must not be declared <const> as its list will be overwritten */
static struct protocol proto_tcpv6 = {
.name = "tcpv6",
.sock_domain = AF_INET6,
.sock_type = SOCK_STREAM,
.sock_prot = IPPROTO_TCP,
.sock_family = AF_INET6,
.sock_addrlen = sizeof(struct sockaddr_in6),
.l3_addrlen = 128/8,
.accept = &listener_accept,
.connect = tcp_connect_server,
.bind = tcp_bind_listener,
.bind_all = tcp_bind_listeners,
.unbind_all = unbind_all_listeners,
.enable_all = enable_all_listeners,
.get_src = tcp_get_src,
.get_dst = tcp_get_dst,
.listeners = LIST_HEAD_INIT(proto_tcpv6.listeners),
.nb_listeners = 0,
};
/* Binds ipv4/ipv6 address <local> to socket <fd>, unless <flags> is set, in which
* case we try to bind <remote>. <flags> is a 2-bit field consisting of :
* - 0 : ignore remote address (may even be a NULL pointer)
* - 1 : use provided address
* - 2 : use provided port
* - 3 : use both
*
* The function supports multiple foreign binding methods :
* - linux_tproxy: we directly bind to the foreign address
* - cttproxy: we bind to a local address then nat.
* The second one can be used as a fallback for the first one.
* This function returns 0 when everything's OK, 1 if it could not bind, to the
* local address, 2 if it could not bind to the foreign address.
*/
int tcp_bind_socket(int fd, int flags, struct sockaddr_storage *local, struct sockaddr_storage *remote)
{
struct sockaddr_storage bind_addr;
int foreign_ok = 0;
int ret;
#ifdef CONFIG_HAP_LINUX_TPROXY
static int ip_transp_working = 1;
static int ip6_transp_working = 1;
switch (local->ss_family) {
case AF_INET:
if (flags && ip_transp_working) {
if (setsockopt(fd, SOL_IP, IP_TRANSPARENT, &one, sizeof(one)) == 0
|| setsockopt(fd, SOL_IP, IP_FREEBIND, &one, sizeof(one)) == 0)
foreign_ok = 1;
else
ip_transp_working = 0;
}
break;
case AF_INET6:
if (flags && ip6_transp_working) {
if (setsockopt(fd, SOL_IPV6, IPV6_TRANSPARENT, &one, sizeof(one)) == 0)
foreign_ok = 1;
else
ip6_transp_working = 0;
}
break;
}
#endif
if (flags) {
memset(&bind_addr, 0, sizeof(bind_addr));
bind_addr.ss_family = remote->ss_family;
switch (remote->ss_family) {
case AF_INET:
if (flags & 1)
((struct sockaddr_in *)&bind_addr)->sin_addr = ((struct sockaddr_in *)remote)->sin_addr;
if (flags & 2)
((struct sockaddr_in *)&bind_addr)->sin_port = ((struct sockaddr_in *)remote)->sin_port;
break;
case AF_INET6:
if (flags & 1)
((struct sockaddr_in6 *)&bind_addr)->sin6_addr = ((struct sockaddr_in6 *)remote)->sin6_addr;
if (flags & 2)
((struct sockaddr_in6 *)&bind_addr)->sin6_port = ((struct sockaddr_in6 *)remote)->sin6_port;
break;
default:
/* we don't want to try to bind to an unknown address family */
foreign_ok = 0;
}
}
setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one));
if (foreign_ok) {
if (is_addr(&bind_addr)) {
ret = bind(fd, (struct sockaddr *)&bind_addr, get_addr_len(&bind_addr));
if (ret < 0)
return 2;
}
}
else {
if (is_addr(local)) {
ret = bind(fd, (struct sockaddr *)local, get_addr_len(local));
if (ret < 0)
return 1;
}
}
if (!flags)
return 0;
#ifdef CONFIG_HAP_CTTPROXY
if (!foreign_ok && remote->ss_family == AF_INET) {
struct in_tproxy itp1, itp2;
memset(&itp1, 0, sizeof(itp1));
itp1.op = TPROXY_ASSIGN;
itp1.v.addr.faddr = ((struct sockaddr_in *)&bind_addr)->sin_addr;
itp1.v.addr.fport = ((struct sockaddr_in *)&bind_addr)->sin_port;
/* set connect flag on socket */
itp2.op = TPROXY_FLAGS;
itp2.v.flags = ITP_CONNECT | ITP_ONCE;
if (setsockopt(fd, SOL_IP, IP_TPROXY, &itp1, sizeof(itp1)) != -1 &&
setsockopt(fd, SOL_IP, IP_TPROXY, &itp2, sizeof(itp2)) != -1) {
foreign_ok = 1;
}
}
#endif
if (!foreign_ok)
/* we could not bind to a foreign address */
return 2;
return 0;
}
/*
* This function initiates a TCP connection establishment to the target assigned
* to connection <conn> using (si->{target,addr.to}). A source address may be
* pointed to by conn->addr.from in case of transparent proxying. Normal source
* bind addresses are still determined locally (due to the possible need of a
* source port). conn->target may point either to a valid server or to a backend,
* depending on conn->target. Only OBJ_TYPE_PROXY and OBJ_TYPE_SERVER are
* supported. The <data> parameter indicates when non-zero that data will
* immediately follow the connection and will tune the ACK behaviour after
* the connect :
* - 0 = always send it
* - 1 = send it unless the backends has the tcp-smart-connect option
* - 2 = never send it
*
* It can return one of :
* - SN_ERR_NONE if everything's OK
* - SN_ERR_SRVTO if there are no more servers
* - SN_ERR_SRVCL if the connection was refused by the server
* - SN_ERR_PRXCOND if the connection has been limited by the proxy (maxconn)
* - SN_ERR_RESOURCE if a system resource is lacking (eg: fd limits, ports, ...)
* - SN_ERR_INTERNAL for any other purely internal errors
* Additionnally, in the case of SN_ERR_RESOURCE, an emergency log will be emitted.
*
* The connection's fd is inserted only when SN_ERR_NONE is returned, otherwise
* it's invalid and the caller has nothing to do.
*/
int tcp_connect_server(struct connection *conn, int data)
{
int fd;
struct server *srv;
struct proxy *be;
switch (obj_type(conn->target)) {
case OBJ_TYPE_PROXY:
be = objt_proxy(conn->target);
srv = NULL;
break;
case OBJ_TYPE_SERVER:
srv = objt_server(conn->target);
be = srv->proxy;
break;
default:
return SN_ERR_INTERNAL;
}
if ((fd = conn->t.sock.fd = socket(conn->addr.to.ss_family, SOCK_STREAM, IPPROTO_TCP)) == -1) {
qfprintf(stderr, "Cannot get a server socket.\n");
if (errno == ENFILE)
send_log(be, LOG_EMERG,
"Proxy %s reached system FD limit at %d. Please check system tunables.\n",
be->id, maxfd);
else if (errno == EMFILE)
send_log(be, LOG_EMERG,
"Proxy %s reached process FD limit at %d. Please check 'ulimit-n' and restart.\n",
be->id, maxfd);
else if (errno == ENOBUFS || errno == ENOMEM)
send_log(be, LOG_EMERG,
"Proxy %s reached system memory limit at %d sockets. Please check system tunables.\n",
be->id, maxfd);
/* this is a resource error */
return SN_ERR_RESOURCE;
}
if (fd >= global.maxsock) {
/* do not log anything there, it's a normal condition when this option
* is used to serialize connections to a server !
*/
Alert("socket(): not enough free sockets. Raise -n argument. Giving up.\n");
close(fd);
return SN_ERR_PRXCOND; /* it is a configuration limit */
}
if ((fcntl(fd, F_SETFL, O_NONBLOCK)==-1) ||
(setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &one, sizeof(one)) == -1)) {
qfprintf(stderr,"Cannot set client socket to non blocking mode.\n");
close(fd);
return SN_ERR_INTERNAL;
}
if (be->options & PR_O_TCP_SRV_KA)
setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, &one, sizeof(one));
/* allow specific binding :
* - server-specific at first
* - proxy-specific next
*/
if (srv != NULL && srv->state & SRV_BIND_SRC) {
int ret, flags = 0;
if (is_addr(&conn->addr.from)) {
switch (srv->state & SRV_TPROXY_MASK) {
case SRV_TPROXY_ADDR:
case SRV_TPROXY_CLI:
flags = 3;
break;
case SRV_TPROXY_CIP:
case SRV_TPROXY_DYN:
flags = 1;
break;
}
}
#ifdef SO_BINDTODEVICE
/* Note: this might fail if not CAP_NET_RAW */
if (srv->iface_name)
setsockopt(fd, SOL_SOCKET, SO_BINDTODEVICE, srv->iface_name, srv->iface_len + 1);
#endif
if (srv->sport_range) {
int attempts = 10; /* should be more than enough to find a spare port */
struct sockaddr_storage src;
ret = 1;
src = srv->source_addr;
do {
/* note: in case of retry, we may have to release a previously
* allocated port, hence this loop's construct.
*/
port_range_release_port(fdinfo[fd].port_range, fdinfo[fd].local_port);
fdinfo[fd].port_range = NULL;
if (!attempts)
break;
attempts--;
fdinfo[fd].local_port = port_range_alloc_port(srv->sport_range);
if (!fdinfo[fd].local_port)
break;
fdinfo[fd].port_range = srv->sport_range;
set_host_port(&src, fdinfo[fd].local_port);
ret = tcp_bind_socket(fd, flags, &src, &conn->addr.from);
} while (ret != 0); /* binding NOK */
}
else {
ret = tcp_bind_socket(fd, flags, &srv->source_addr, &conn->addr.from);
}
if (ret) {
port_range_release_port(fdinfo[fd].port_range, fdinfo[fd].local_port);
fdinfo[fd].port_range = NULL;
close(fd);
if (ret == 1) {
Alert("Cannot bind to source address before connect() for server %s/%s. Aborting.\n",
be->id, srv->id);
send_log(be, LOG_EMERG,
"Cannot bind to source address before connect() for server %s/%s.\n",
be->id, srv->id);
} else {
Alert("Cannot bind to tproxy source address before connect() for server %s/%s. Aborting.\n",
be->id, srv->id);
send_log(be, LOG_EMERG,
"Cannot bind to tproxy source address before connect() for server %s/%s.\n",
be->id, srv->id);
}
return SN_ERR_RESOURCE;
}
}
else if (be->options & PR_O_BIND_SRC) {
int ret, flags = 0;
if (is_addr(&conn->addr.from)) {
switch (be->options & PR_O_TPXY_MASK) {
case PR_O_TPXY_ADDR:
case PR_O_TPXY_CLI:
flags = 3;
break;
case PR_O_TPXY_CIP:
case PR_O_TPXY_DYN:
flags = 1;
break;
}
}
#ifdef SO_BINDTODEVICE
/* Note: this might fail if not CAP_NET_RAW */
if (be->iface_name)
setsockopt(fd, SOL_SOCKET, SO_BINDTODEVICE, be->iface_name, be->iface_len + 1);
#endif
ret = tcp_bind_socket(fd, flags, &be->source_addr, &conn->addr.from);
if (ret) {
close(fd);
if (ret == 1) {
Alert("Cannot bind to source address before connect() for proxy %s. Aborting.\n",
be->id);
send_log(be, LOG_EMERG,
"Cannot bind to source address before connect() for proxy %s.\n",
be->id);
} else {
Alert("Cannot bind to tproxy source address before connect() for proxy %s. Aborting.\n",
be->id);
send_log(be, LOG_EMERG,
"Cannot bind to tproxy source address before connect() for proxy %s.\n",
be->id);
}
return SN_ERR_RESOURCE;
}
}
#if defined(TCP_QUICKACK)
/* disabling tcp quick ack now allows the first request to leave the
* machine with the first ACK. We only do this if there are pending
* data in the buffer or if we plan to close after SYN/ACK (TCP checks).
*/
if (data == 2 || (data && (be->options2 & PR_O2_SMARTCON)))
setsockopt(fd, IPPROTO_TCP, TCP_QUICKACK, &zero, sizeof(zero));
#endif
if (global.tune.server_sndbuf)
setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &global.tune.server_sndbuf, sizeof(global.tune.server_sndbuf));
if (global.tune.server_rcvbuf)
setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &global.tune.server_rcvbuf, sizeof(global.tune.server_rcvbuf));
if ((connect(fd, (struct sockaddr *)&conn->addr.to, get_addr_len(&conn->addr.to)) == -1) &&
(errno != EINPROGRESS) && (errno != EALREADY) && (errno != EISCONN)) {
if (errno == EAGAIN || errno == EADDRINUSE) {
char *msg;
if (errno == EAGAIN) /* no free ports left, try again later */
msg = "no free ports";
else
msg = "local address already in use";
qfprintf(stderr,"Cannot connect: %s.\n",msg);
port_range_release_port(fdinfo[fd].port_range, fdinfo[fd].local_port);
fdinfo[fd].port_range = NULL;
close(fd);
send_log(be, LOG_EMERG,
"Connect() failed for server %s/%s: %s.\n",
be->id, srv->id, msg);
return SN_ERR_RESOURCE;
} else if (errno == ETIMEDOUT) {
//qfprintf(stderr,"Connect(): ETIMEDOUT");
port_range_release_port(fdinfo[fd].port_range, fdinfo[fd].local_port);
fdinfo[fd].port_range = NULL;
close(fd);
return SN_ERR_SRVTO;
} else {
// (errno == ECONNREFUSED || errno == ENETUNREACH || errno == EACCES || errno == EPERM)
//qfprintf(stderr,"Connect(): %d", errno);
port_range_release_port(fdinfo[fd].port_range, fdinfo[fd].local_port);
fdinfo[fd].port_range = NULL;
close(fd);
return SN_ERR_SRVCL;
}
}
fdtab[fd].owner = conn;
conn->flags = CO_FL_WAIT_L4_CONN; /* connection in progress */
fdtab[fd].iocb = conn_fd_handler;
fd_insert(fd);
conn_sock_want_send(conn); /* for connect status */
if (conn_xprt_init(conn) < 0) {
fd_delete(fd);
return SN_ERR_RESOURCE;
}
if (data)
conn_data_want_send(conn); /* prepare to send data if any */
return SN_ERR_NONE; /* connection is OK */
}
/*
* Retrieves the source address for the socket <fd>, with <dir> indicating
* if we're a listener (=0) or an initiator (!=0). It returns 0 in case of
* success, -1 in case of error. The socket's source address is stored in
* <sa> for <salen> bytes.
*/
int tcp_get_src(int fd, struct sockaddr *sa, socklen_t salen, int dir)
{
if (dir)
return getsockname(fd, sa, &salen);
else
return getpeername(fd, sa, &salen);
}
/*
* Retrieves the original destination address for the socket <fd>, with <dir>
* indicating if we're a listener (=0) or an initiator (!=0). In the case of a
* listener, if the original destination address was translated, the original
* address is retrieved. It returns 0 in case of success, -1 in case of error.
* The socket's source address is stored in <sa> for <salen> bytes.
*/
int tcp_get_dst(int fd, struct sockaddr *sa, socklen_t salen, int dir)
{
if (dir)
return getpeername(fd, sa, &salen);
#if defined(TPROXY) && defined(SO_ORIGINAL_DST)
else if (getsockopt(fd, SOL_IP, SO_ORIGINAL_DST, sa, &salen) == 0)
return 0;
#endif
else
return getsockname(fd, sa, &salen);
}
/* This is the callback which is set when a connection establishment is pending
* and we have nothing to send, or if we have an init function we want to call
* once the connection is established. It updates the FD polling status. It
* returns 0 if it fails in a fatal way or needs to poll to go further, otherwise
* it returns non-zero and removes itself from the connection's flags (the bit is
* provided in <flag> by the caller).
*/
int tcp_connect_probe(struct connection *conn)
{
int fd = conn->t.sock.fd;
if (conn->flags & CO_FL_ERROR)
return 0;
if (!(conn->flags & CO_FL_WAIT_L4_CONN))
return 1; /* strange we were called while ready */
/* stop here if we reached the end of data */
if ((fdtab[fd].ev & (FD_POLL_IN|FD_POLL_HUP)) == FD_POLL_HUP)
goto out_error;
/* We have no data to send to check the connection, and
* getsockopt() will not inform us whether the connection
* is still pending. So we'll reuse connect() to check the
* state of the socket. This has the advantage of giving us
* the following info :
* - error
* - connecting (EALREADY, EINPROGRESS)
* - connected (EISCONN, 0)
*/
if (connect(fd, (struct sockaddr *)&conn->addr.to, get_addr_len(&conn->addr.to)) < 0) {
if (errno == EALREADY || errno == EINPROGRESS) {
conn_sock_stop_recv(conn);
conn_sock_poll_send(conn);
return 0;
}
if (errno && errno != EISCONN)
goto out_error;
/* otherwise we're connected */
}
/* The FD is ready now, we'll mark the connection as complete and
* forward the event to the transport layer which will notify the
* data layer.
*/
conn->flags &= ~CO_FL_WAIT_L4_CONN;
return 1;
out_error:
/* Write error on the file descriptor. Report it to the connection
* and disable polling on this FD.
*/
conn->flags |= CO_FL_ERROR;
conn_sock_stop_both(conn);
return 0;
}
/* This function tries to bind a TCPv4/v6 listener. It may return a warning or
* an error message in <err> if the message is at most <errlen> bytes long
* (including '\0'). The return value is composed from ERR_ABORT, ERR_WARN,
* ERR_ALERT, ERR_RETRYABLE and ERR_FATAL. ERR_NONE indicates that everything
* was alright and that no message was returned. ERR_RETRYABLE means that an
* error occurred but that it may vanish after a retry (eg: port in use), and
* ERR_FATAL indicates a non-fixable error. ERR_WARN and ERR_ALERT do not alter
* the meaning of the error, but just indicate that a message is present which
* should be displayed with the respective level. Last, ERR_ABORT indicates
* that it's pointless to try to start other listeners. No error message is
* returned if errlen is NULL.
*/
int tcp_bind_listener(struct listener *listener, char *errmsg, int errlen)
{
__label__ tcp_return, tcp_close_return;
int fd, err;
const char *msg = NULL;
/* ensure we never return garbage */
if (errmsg && errlen)
*errmsg = 0;
if (listener->state != LI_ASSIGNED)
return ERR_NONE; /* already bound */
err = ERR_NONE;
if ((fd = socket(listener->addr.ss_family, SOCK_STREAM, IPPROTO_TCP)) == -1) {
err |= ERR_RETRYABLE | ERR_ALERT;
msg = "cannot create listening socket";
goto tcp_return;
}
if (fd >= global.maxsock) {
err |= ERR_FATAL | ERR_ABORT | ERR_ALERT;
msg = "not enough free sockets (raise '-n' parameter)";
goto tcp_close_return;
}
if (fcntl(fd, F_SETFL, O_NONBLOCK) == -1) {
err |= ERR_FATAL | ERR_ALERT;
msg = "cannot make socket non-blocking";
goto tcp_close_return;
}
if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one)) == -1) {
/* not fatal but should be reported */
msg = "cannot do so_reuseaddr";
err |= ERR_ALERT;
}
if (listener->options & LI_O_NOLINGER)
setsockopt(fd, SOL_SOCKET, SO_LINGER, &nolinger, sizeof(struct linger));
#ifdef SO_REUSEPORT
/* OpenBSD supports this. As it's present in old libc versions of Linux,
* it might return an error that we will silently ignore.
*/
setsockopt(fd, SOL_SOCKET, SO_REUSEPORT, &one, sizeof(one));
#endif
#ifdef CONFIG_HAP_LINUX_TPROXY
if (listener->options & LI_O_FOREIGN) {
switch (listener->addr.ss_family) {
case AF_INET:
if ((setsockopt(fd, SOL_IP, IP_TRANSPARENT, &one, sizeof(one)) == -1)
&& (setsockopt(fd, SOL_IP, IP_FREEBIND, &one, sizeof(one)) == -1)) {
msg = "cannot make listening socket transparent";
err |= ERR_ALERT;
}
break;
case AF_INET6:
if (setsockopt(fd, SOL_IPV6, IPV6_TRANSPARENT, &one, sizeof(one)) == -1) {
msg = "cannot make listening socket transparent";
err |= ERR_ALERT;
}
break;
}
}
#endif
#ifdef SO_BINDTODEVICE
/* Note: this might fail if not CAP_NET_RAW */
if (listener->interface) {
if (setsockopt(fd, SOL_SOCKET, SO_BINDTODEVICE,
listener->interface, strlen(listener->interface) + 1) == -1) {
msg = "cannot bind listener to device";
err |= ERR_WARN;
}
}
#endif
#if defined(TCP_MAXSEG)
if (listener->maxseg > 0) {
if (setsockopt(fd, IPPROTO_TCP, TCP_MAXSEG,
&listener->maxseg, sizeof(listener->maxseg)) == -1) {
msg = "cannot set MSS";
err |= ERR_WARN;
}
}
#endif
#if defined(TCP_DEFER_ACCEPT)
if (listener->options & LI_O_DEF_ACCEPT) {
/* defer accept by up to one second */
int accept_delay = 1;
if (setsockopt(fd, IPPROTO_TCP, TCP_DEFER_ACCEPT, &accept_delay, sizeof(accept_delay)) == -1) {
msg = "cannot enable DEFER_ACCEPT";
err |= ERR_WARN;
}
}
#endif
#if defined(TCP_FASTOPEN)
if (listener->options & LI_O_TCP_FO) {
/* TFO needs a queue length, let's use the configured backlog */
int qlen = listener->backlog ? listener->backlog : listener->maxconn;
if (setsockopt(fd, IPPROTO_TCP, TCP_FASTOPEN, &qlen, sizeof(qlen)) == -1) {
msg = "cannot enable TCP_FASTOPEN";
err |= ERR_WARN;
}
}
#endif
if (bind(fd, (struct sockaddr *)&listener->addr, listener->proto->sock_addrlen) == -1) {
err |= ERR_RETRYABLE | ERR_ALERT;
msg = "cannot bind socket";
goto tcp_close_return;
}
if (listen(fd, listener->backlog ? listener->backlog : listener->maxconn) == -1) {
err |= ERR_RETRYABLE | ERR_ALERT;
msg = "cannot listen to socket";
goto tcp_close_return;
}
#if defined(TCP_QUICKACK)
if (listener->options & LI_O_NOQUICKACK)
setsockopt(fd, IPPROTO_TCP, TCP_QUICKACK, &zero, sizeof(zero));
#endif
/* the socket is ready */
listener->fd = fd;
listener->state = LI_LISTEN;
fdtab[fd].owner = listener; /* reference the listener instead of a task */
fdtab[fd].iocb = listener->proto->accept;
fd_insert(fd);
tcp_return:
if (msg && errlen) {
char pn[INET6_ADDRSTRLEN];
addr_to_str(&listener->addr, pn, sizeof(pn));
snprintf(errmsg, errlen, "%s [%s:%d]", msg, pn, get_host_port(&listener->addr));
}
return err;
tcp_close_return:
close(fd);
goto tcp_return;
}
/* This function creates all TCP sockets bound to the protocol entry <proto>.
* It is intended to be used as the protocol's bind_all() function.
* The sockets will be registered but not added to any fd_set, in order not to
* loose them across the fork(). A call to enable_all_listeners() is needed
* to complete initialization. The return value is composed from ERR_*.
*/
static int tcp_bind_listeners(struct protocol *proto, char *errmsg, int errlen)
{
struct listener *listener;
int err = ERR_NONE;
list_for_each_entry(listener, &proto->listeners, proto_list) {
err |= tcp_bind_listener(listener, errmsg, errlen);
if (err & ERR_ABORT)
break;
}
return err;
}
/* Add listener to the list of tcpv4 listeners. The listener's state
* is automatically updated from LI_INIT to LI_ASSIGNED. The number of
* listeners is updated. This is the function to use to add a new listener.
*/
void tcpv4_add_listener(struct listener *listener)
{
if (listener->state != LI_INIT)
return;
listener->state = LI_ASSIGNED;
listener->proto = &proto_tcpv4;
LIST_ADDQ(&proto_tcpv4.listeners, &listener->proto_list);
proto_tcpv4.nb_listeners++;
}
/* Add listener to the list of tcpv4 listeners. The listener's state
* is automatically updated from LI_INIT to LI_ASSIGNED. The number of
* listeners is updated. This is the function to use to add a new listener.
*/
void tcpv6_add_listener(struct listener *listener)
{
if (listener->state != LI_INIT)
return;
listener->state = LI_ASSIGNED;
listener->proto = &proto_tcpv6;
LIST_ADDQ(&proto_tcpv6.listeners, &listener->proto_list);
proto_tcpv6.nb_listeners++;
}
/* This function performs the TCP request analysis on the current request. It
* returns 1 if the processing can continue on next analysers, or zero if it
* needs more data, encounters an error, or wants to immediately abort the
* request. It relies on buffers flags, and updates s->req->analysers. The
* function may be called for frontend rules and backend rules. It only relies
* on the backend pointer so this works for both cases.
*/
int tcp_inspect_request(struct session *s, struct channel *req, int an_bit)
{
struct tcp_rule *rule;
struct stksess *ts;
struct stktable *t;
int partial;
DPRINTF(stderr,"[%u] %s: session=%p b=%p, exp(r,w)=%u,%u bf=%08x bh=%d analysers=%02x\n",
now_ms, __FUNCTION__,
s,
req,
req->rex, req->wex,
req->flags,
req->buf->i,
req->analysers);
/* We don't know whether we have enough data, so must proceed
* this way :
* - iterate through all rules in their declaration order
* - if one rule returns MISS, it means the inspect delay is
* not over yet, then return immediately, otherwise consider
* it as a non-match.
* - if one rule returns OK, then return OK
* - if one rule returns KO, then return KO
*/
if ((req->flags & CF_SHUTR) || buffer_full(req->buf, global.tune.maxrewrite) ||
!s->be->tcp_req.inspect_delay || tick_is_expired(req->analyse_exp, now_ms))
partial = SMP_OPT_FINAL;
else
partial = 0;
list_for_each_entry(rule, &s->be->tcp_req.inspect_rules, list) {
int ret = ACL_PAT_PASS;
if (rule->cond) {
ret = acl_exec_cond(rule->cond, s->be, s, &s->txn, SMP_OPT_DIR_REQ | partial);
if (ret == ACL_PAT_MISS) {
channel_dont_connect(req);
/* just set the request timeout once at the beginning of the request */
if (!tick_isset(req->analyse_exp) && s->be->tcp_req.inspect_delay)
req->analyse_exp = tick_add_ifset(now_ms, s->be->tcp_req.inspect_delay);
return 0;
}
ret = acl_pass(ret);
if (rule->cond->pol == ACL_COND_UNLESS)
ret = !ret;
}
if (ret) {
/* we have a matching rule. */
if (rule->action == TCP_ACT_REJECT) {
channel_abort(req);
channel_abort(s->rep);
req->analysers = 0;
s->be->be_counters.denied_req++;
s->fe->fe_counters.denied_req++;
if (s->listener->counters)
s->listener->counters->denied_req++;
if (!(s->flags & SN_ERR_MASK))
s->flags |= SN_ERR_PRXCOND;
if (!(s->flags & SN_FINST_MASK))
s->flags |= SN_FINST_R;
return 0;
}
else if (rule->action == TCP_ACT_TRK_SC1) {
if (!s->stkctr1_entry) {
/* only the first valid track-sc1 directive applies.
* Also, note that right now we can only track SRC so we
* don't check how to get the key, but later we may need
* to consider rule->act_prm->trk_ctr.type.
*/
t = rule->act_prm.trk_ctr.table.t;
ts = stktable_get_entry(t, addr_to_stktable_key(&s->si[0].conn->addr.from));
if (ts) {
session_track_stkctr1(s, t, ts);
if (s->fe != s->be)
s->flags |= SN_BE_TRACK_SC1;
}
}
}
else if (rule->action == TCP_ACT_TRK_SC2) {
if (!s->stkctr2_entry) {
/* only the first valid track-sc2 directive applies.
* Also, note that right now we can only track SRC so we
* don't check how to get the key, but later we may need
* to consider rule->act_prm->trk_ctr.type.
*/
t = rule->act_prm.trk_ctr.table.t;
ts = stktable_get_entry(t, addr_to_stktable_key(&s->si[0].conn->addr.from));
if (ts) {
session_track_stkctr2(s, t, ts);
if (s->fe != s->be)
s->flags |= SN_BE_TRACK_SC2;
}
}
}
else {
/* otherwise accept */
break;
}
}
}
/* if we get there, it means we have no rule which matches, or
* we have an explicit accept, so we apply the default accept.
*/
req->analysers &= ~an_bit;
req->analyse_exp = TICK_ETERNITY;
return 1;
}
/* This function performs the TCP response analysis on the current response. It
* returns 1 if the processing can continue on next analysers, or zero if it
* needs more data, encounters an error, or wants to immediately abort the
* response. It relies on buffers flags, and updates s->rep->analysers. The
* function may be called for backend rules.
*/
int tcp_inspect_response(struct session *s, struct channel *rep, int an_bit)
{
struct tcp_rule *rule;
int partial;
DPRINTF(stderr,"[%u] %s: session=%p b=%p, exp(r,w)=%u,%u bf=%08x bh=%d analysers=%02x\n",
now_ms, __FUNCTION__,
s,
rep,
rep->rex, rep->wex,
rep->flags,
rep->buf->i,
rep->analysers);
/* We don't know whether we have enough data, so must proceed
* this way :
* - iterate through all rules in their declaration order
* - if one rule returns MISS, it means the inspect delay is
* not over yet, then return immediately, otherwise consider
* it as a non-match.
* - if one rule returns OK, then return OK
* - if one rule returns KO, then return KO
*/
if (rep->flags & CF_SHUTR || tick_is_expired(rep->analyse_exp, now_ms))
partial = SMP_OPT_FINAL;
else
partial = 0;
list_for_each_entry(rule, &s->be->tcp_rep.inspect_rules, list) {
int ret = ACL_PAT_PASS;
if (rule->cond) {
ret = acl_exec_cond(rule->cond, s->be, s, &s->txn, SMP_OPT_DIR_RES | partial);
if (ret == ACL_PAT_MISS) {
/* just set the analyser timeout once at the beginning of the response */
if (!tick_isset(rep->analyse_exp) && s->be->tcp_rep.inspect_delay)
rep->analyse_exp = tick_add_ifset(now_ms, s->be->tcp_rep.inspect_delay);
return 0;
}
ret = acl_pass(ret);
if (rule->cond->pol == ACL_COND_UNLESS)
ret = !ret;
}
if (ret) {
/* we have a matching rule. */
if (rule->action == TCP_ACT_REJECT) {
channel_abort(rep);
channel_abort(s->req);
rep->analysers = 0;
s->be->be_counters.denied_resp++;
s->fe->fe_counters.denied_resp++;
if (s->listener->counters)
s->listener->counters->denied_resp++;
if (!(s->flags & SN_ERR_MASK))
s->flags |= SN_ERR_PRXCOND;
if (!(s->flags & SN_FINST_MASK))
s->flags |= SN_FINST_D;
return 0;
}
else {
/* otherwise accept */
break;
}
}
}
/* if we get there, it means we have no rule which matches, or
* we have an explicit accept, so we apply the default accept.
*/
rep->analysers &= ~an_bit;
rep->analyse_exp = TICK_ETERNITY;
return 1;
}
/* This function performs the TCP layer4 analysis on the current request. It
* returns 0 if a reject rule matches, otherwise 1 if either an accept rule
* matches or if no more rule matches. It can only use rules which don't need
* any data.
*/
int tcp_exec_req_rules(struct session *s)
{
struct tcp_rule *rule;
struct stksess *ts;
struct stktable *t = NULL;
int result = 1;
int ret;
list_for_each_entry(rule, &s->fe->tcp_req.l4_rules, list) {
ret = ACL_PAT_PASS;
if (rule->cond) {
ret = acl_exec_cond(rule->cond, s->fe, s, NULL, SMP_OPT_DIR_REQ|SMP_OPT_FINAL);
ret = acl_pass(ret);
if (rule->cond->pol == ACL_COND_UNLESS)
ret = !ret;
}
if (ret) {
/* we have a matching rule. */
if (rule->action == TCP_ACT_REJECT) {
s->fe->fe_counters.denied_conn++;
if (s->listener->counters)
s->listener->counters->denied_conn++;
if (!(s->flags & SN_ERR_MASK))
s->flags |= SN_ERR_PRXCOND;
if (!(s->flags & SN_FINST_MASK))
s->flags |= SN_FINST_R;
result = 0;
break;
}
else if (rule->action == TCP_ACT_TRK_SC1) {
if (!s->stkctr1_entry) {
/* only the first valid track-sc1 directive applies.
* Also, note that right now we can only track SRC so we
* don't check how to get the key, but later we may need
* to consider rule->act_prm->trk_ctr.type.
*/
t = rule->act_prm.trk_ctr.table.t;
ts = stktable_get_entry(t, addr_to_stktable_key(&s->si[0].conn->addr.from));
if (ts)
session_track_stkctr1(s, t, ts);
}
}
else if (rule->action == TCP_ACT_TRK_SC2) {
if (!s->stkctr2_entry) {
/* only the first valid track-sc2 directive applies.
* Also, note that right now we can only track SRC so we
* don't check how to get the key, but later we may need
* to consider rule->act_prm->trk_ctr.type.
*/
t = rule->act_prm.trk_ctr.table.t;
ts = stktable_get_entry(t, addr_to_stktable_key(&s->si[0].conn->addr.from));
if (ts)
session_track_stkctr2(s, t, ts);
}
}
else {
/* otherwise it's an accept */
break;
}
}
}
return result;
}
/* Parse a tcp-response rule. Return a negative value in case of failure */
static int tcp_parse_response_rule(char **args, int arg, int section_type,
struct proxy *curpx, struct proxy *defpx,
struct tcp_rule *rule, char **err)
{
if (curpx == defpx || !(curpx->cap & PR_CAP_BE)) {
memprintf(err, "%s %s is only allowed in 'backend' sections",
args[0], args[1]);
return -1;
}
if (strcmp(args[arg], "accept") == 0) {
arg++;
rule->action = TCP_ACT_ACCEPT;
}
else if (strcmp(args[arg], "reject") == 0) {
arg++;
rule->action = TCP_ACT_REJECT;
}
else {
memprintf(err,
"'%s %s' expects 'accept' or 'reject' in %s '%s' (got '%s')",
args[0], args[1], proxy_type_str(curpx), curpx->id, args[arg]);
return -1;
}
if (strcmp(args[arg], "if") == 0 || strcmp(args[arg], "unless") == 0) {
if ((rule->cond = build_acl_cond(NULL, 0, curpx, (const char **)args+arg, err)) == NULL) {
memprintf(err,
"'%s %s %s' : error detected in %s '%s' while parsing '%s' condition : %s",
args[0], args[1], args[2], proxy_type_str(curpx), curpx->id, args[arg], *err);
return -1;
}
}
else if (*args[arg]) {
memprintf(err,
"'%s %s %s' only accepts 'if' or 'unless', in %s '%s' (got '%s')",
args[0], args[1], args[2], proxy_type_str(curpx), curpx->id, args[arg]);
return -1;
}
return 0;
}
/* Parse a tcp-request rule. Return a negative value in case of failure */
static int tcp_parse_request_rule(char **args, int arg, int section_type,
struct proxy *curpx, struct proxy *defpx,
struct tcp_rule *rule, char **err)
{
if (curpx == defpx) {
memprintf(err, "%s %s is not allowed in 'defaults' sections",
args[0], args[1]);
return -1;
}
if (!strcmp(args[arg], "accept")) {
arg++;
rule->action = TCP_ACT_ACCEPT;
}
else if (!strcmp(args[arg], "reject")) {
arg++;
rule->action = TCP_ACT_REJECT;
}
else if (strcmp(args[arg], "track-sc1") == 0) {
int ret;
int kw = arg;
arg++;
ret = parse_track_counters(args, &arg, section_type, curpx,
&rule->act_prm.trk_ctr, defpx, err);
if (ret < 0) { /* nb: warnings are not handled yet */
memprintf(err,
"'%s %s %s' : %s in %s '%s'",
args[0], args[1], args[kw], *err, proxy_type_str(curpx), curpx->id);
return ret;
}
rule->action = TCP_ACT_TRK_SC1;
}
else if (strcmp(args[arg], "track-sc2") == 0) {
int ret;
int kw = arg;
arg++;
ret = parse_track_counters(args, &arg, section_type, curpx,
&rule->act_prm.trk_ctr, defpx, err);
if (ret < 0) { /* nb: warnings are not handled yet */
memprintf(err,
"'%s %s %s' : %s in %s '%s'",
args[0], args[1], args[kw], *err, proxy_type_str(curpx), curpx->id);
return ret;
}
rule->action = TCP_ACT_TRK_SC2;
}
else {
memprintf(err,
"'%s %s' expects 'accept', 'reject', 'track-sc1' "
"or 'track-sc2' in %s '%s' (got '%s')",
args[0], args[1], proxy_type_str(curpx), curpx->id, args[arg]);
return -1;
}
if (strcmp(args[arg], "if") == 0 || strcmp(args[arg], "unless") == 0) {
if ((rule->cond = build_acl_cond(NULL, 0, curpx, (const char **)args+arg, err)) == NULL) {
memprintf(err,
"'%s %s %s' : error detected in %s '%s' while parsing '%s' condition : %s",
args[0], args[1], args[2], proxy_type_str(curpx), curpx->id, args[arg], *err);
return -1;
}
}
else if (*args[arg]) {
memprintf(err,
"'%s %s %s' only accepts 'if' or 'unless', in %s '%s' (got '%s')",
args[0], args[1], args[2], proxy_type_str(curpx), curpx->id, args[arg]);
return -1;
}
return 0;
}
/* This function should be called to parse a line starting with the "tcp-response"
* keyword.
*/
static int tcp_parse_tcp_rep(char **args, int section_type, struct proxy *curpx,
struct proxy *defpx, const char *file, int line,
char **err)
{
const char *ptr = NULL;
unsigned int val;
int warn = 0;
int arg;
struct tcp_rule *rule;
if (!*args[1]) {
memprintf(err, "missing argument for '%s' in %s '%s'",
args[0], proxy_type_str(curpx), curpx->id);
return -1;
}
if (strcmp(args[1], "inspect-delay") == 0) {
if (curpx == defpx || !(curpx->cap & PR_CAP_BE)) {
memprintf(err, "%s %s is only allowed in 'backend' sections",
args[0], args[1]);
return -1;
}
if (!*args[2] || (ptr = parse_time_err(args[2], &val, TIME_UNIT_MS))) {
memprintf(err,
"'%s %s' expects a positive delay in milliseconds, in %s '%s'",
args[0], args[1], proxy_type_str(curpx), curpx->id);
if (ptr)
memprintf(err, "%s (unexpected character '%c')", *err, *ptr);
return -1;
}
if (curpx->tcp_rep.inspect_delay) {
memprintf(err, "ignoring %s %s (was already defined) in %s '%s'",
args[0], args[1], proxy_type_str(curpx), curpx->id);
return 1;
}
curpx->tcp_rep.inspect_delay = val;
return 0;
}
rule = calloc(1, sizeof(*rule));
LIST_INIT(&rule->list);
arg = 1;
if (strcmp(args[1], "content") == 0) {
arg++;
if (tcp_parse_response_rule(args, arg, section_type, curpx, defpx, rule, err) < 0)
goto error;
if (rule->cond && (rule->cond->requires & ACL_USE_L6REQ_VOLATILE)) {
struct acl *acl;
const char *name;
acl = cond_find_require(rule->cond, ACL_USE_L6REQ_VOLATILE);
name = acl ? acl->name : "(unknown)";
memprintf(err,
"acl '%s' involves some request-only criteria which will be ignored in '%s %s'",
name, args[0], args[1]);
warn++;
}
LIST_ADDQ(&curpx->tcp_rep.inspect_rules, &rule->list);
}
else {
memprintf(err,
"'%s' expects 'inspect-delay' or 'content' in %s '%s' (got '%s')",
args[0], proxy_type_str(curpx), curpx->id, args[1]);
goto error;
}
return warn;
error:
free(rule);
return -1;
}
/* This function should be called to parse a line starting with the "tcp-request"
* keyword.
*/
static int tcp_parse_tcp_req(char **args, int section_type, struct proxy *curpx,
struct proxy *defpx, const char *file, int line,
char **err)
{
const char *ptr = NULL;
unsigned int val;
int warn = 0;
int arg;
struct tcp_rule *rule;
if (!*args[1]) {
if (curpx == defpx)
memprintf(err, "missing argument for '%s' in defaults section", args[0]);
else
memprintf(err, "missing argument for '%s' in %s '%s'",
args[0], proxy_type_str(curpx), curpx->id);
return -1;
}
if (!strcmp(args[1], "inspect-delay")) {
if (curpx == defpx) {
memprintf(err, "%s %s is not allowed in 'defaults' sections",
args[0], args[1]);
return -1;
}
if (!*args[2] || (ptr = parse_time_err(args[2], &val, TIME_UNIT_MS))) {
memprintf(err,
"'%s %s' expects a positive delay in milliseconds, in %s '%s'",
args[0], args[1], proxy_type_str(curpx), curpx->id);
if (ptr)
memprintf(err, "%s (unexpected character '%c')", *err, *ptr);
return -1;
}
if (curpx->tcp_req.inspect_delay) {
memprintf(err, "ignoring %s %s (was already defined) in %s '%s'",
args[0], args[1], proxy_type_str(curpx), curpx->id);
return 1;
}
curpx->tcp_req.inspect_delay = val;
return 0;
}
rule = calloc(1, sizeof(*rule));
LIST_INIT(&rule->list);
arg = 1;
if (strcmp(args[1], "content") == 0) {
arg++;
if (tcp_parse_request_rule(args, arg, section_type, curpx, defpx, rule, err) < 0)
goto error;
if (rule->cond && (rule->cond->requires & ACL_USE_RTR_ANY)) {
struct acl *acl;
const char *name;
acl = cond_find_require(rule->cond, ACL_USE_RTR_ANY);
name = acl ? acl->name : "(unknown)";
memprintf(err,
"acl '%s' involves some response-only criteria which will be ignored in '%s %s'",
name, args[0], args[1]);
warn++;
}
LIST_ADDQ(&curpx->tcp_req.inspect_rules, &rule->list);
}
else if (strcmp(args[1], "connection") == 0) {
arg++;
if (!(curpx->cap & PR_CAP_FE)) {
memprintf(err, "%s %s is not allowed because %s %s is not a frontend",
args[0], args[1], proxy_type_str(curpx), curpx->id);
goto error;
}
if (tcp_parse_request_rule(args, arg, section_type, curpx, defpx, rule, err) < 0)
goto error;
if (rule->cond && (rule->cond->requires & (ACL_USE_RTR_ANY|ACL_USE_L6_ANY|ACL_USE_L7_ANY))) {
struct acl *acl;
const char *name;
acl = cond_find_require(rule->cond, ACL_USE_RTR_ANY|ACL_USE_L6_ANY|ACL_USE_L7_ANY);
name = acl ? acl->name : "(unknown)";
if (acl->requires & (ACL_USE_L6_ANY|ACL_USE_L7_ANY)) {
memprintf(err,
"'%s %s' may not reference acl '%s' which makes use of "
"payload in %s '%s'. Please use '%s content' for this.",
args[0], args[1], name, proxy_type_str(curpx), curpx->id, args[0]);
goto error;
}
if (acl->requires & ACL_USE_RTR_ANY)
memprintf(err,
"acl '%s' involves some response-only criteria which will be ignored in '%s %s'",
name, args[0], args[1]);
warn++;
}
LIST_ADDQ(&curpx->tcp_req.l4_rules, &rule->list);
}
else {
if (curpx == defpx)
memprintf(err,
"'%s' expects 'inspect-delay', 'connection', or 'content' in defaults section (got '%s')",
args[0], args[1]);
else
memprintf(err,
"'%s' expects 'inspect-delay', 'connection', or 'content' in %s '%s' (got '%s')",
args[0], args[1], proxy_type_str(curpx), curpx->id);
goto error;
}
return warn;
error:
free(rule);
return -1;
}
/************************************************************************/
/* All supported sample fetch functios must be declared here */
/************************************************************************/
/* Fetch the request RDP cookie identified in the args, or any cookie if no arg
* is passed. It is usable both for ACL and for samples. Note: this decoder
* only works with non-wrapping data. Accepts either 0 or 1 argument. Argument
* is a string (cookie name), other types will lead to undefined behaviour.
*/
int
smp_fetch_rdp_cookie(struct proxy *px, struct session *l4, void *l7, unsigned int opt,
const struct arg *args, struct sample *smp)
{
int bleft;
const unsigned char *data;
if (!l4 || !l4->req)
return 0;
smp->flags = 0;
smp->type = SMP_T_CSTR;
bleft = l4->req->buf->i;
if (bleft <= 11)
goto too_short;
data = (const unsigned char *)l4->req->buf->p + 11;
bleft -= 11;
if (bleft <= 7)
goto too_short;
if (strncasecmp((const char *)data, "Cookie:", 7) != 0)
goto not_cookie;
data += 7;
bleft -= 7;
while (bleft > 0 && *data == ' ') {
data++;
bleft--;
}
if (args) {
if (bleft <= args->data.str.len)
goto too_short;
if ((data[args->data.str.len] != '=') ||
strncasecmp(args->data.str.str, (const char *)data, args->data.str.len) != 0)
goto not_cookie;
data += args->data.str.len + 1;
bleft -= args->data.str.len + 1;
} else {
while (bleft > 0 && *data != '=') {
if (*data == '\r' || *data == '\n')
goto not_cookie;
data++;
bleft--;
}
if (bleft < 1)
goto too_short;
if (*data != '=')
goto not_cookie;
data++;
bleft--;
}
/* data points to cookie value */
smp->data.str.str = (char *)data;
smp->data.str.len = 0;
while (bleft > 0 && *data != '\r') {
data++;
bleft--;
}
if (bleft < 2)
goto too_short;
if (data[0] != '\r' || data[1] != '\n')
goto not_cookie;
smp->data.str.len = (char *)data - smp->data.str.str;
smp->flags = SMP_F_VOLATILE;
return 1;
too_short:
smp->flags = SMP_F_MAY_CHANGE;
not_cookie:
return 0;
}
/************************************************************************/
/* All supported ACL keywords must be declared here. */
/************************************************************************/
/* returns either 1 or 0 depending on whether an RDP cookie is found or not */
static int
acl_fetch_rdp_cookie_cnt(struct proxy *px, struct session *l4, void *l7, unsigned int opt,
const struct arg *args, struct sample *smp)
{
int ret;
ret = smp_fetch_rdp_cookie(px, l4, l7, opt, args, smp);
if (smp->flags & SMP_F_MAY_CHANGE)
return 0;
smp->flags = SMP_F_VOLATILE;
smp->type = SMP_T_UINT;
smp->data.uint = ret;
return 1;
}
/* fetch the connection's source IPv4/IPv6 address */
static int
smp_fetch_src(struct proxy *px, struct session *l4, void *l7, unsigned int opt,
const struct arg *args, struct sample *smp)
{
switch (l4->si[0].conn->addr.from.ss_family) {
case AF_INET:
smp->data.ipv4 = ((struct sockaddr_in *)&l4->si[0].conn->addr.from)->sin_addr;
smp->type = SMP_T_IPV4;
break;
case AF_INET6:
smp->data.ipv6 = ((struct sockaddr_in6 *)(&l4->si[0].conn->addr.from))->sin6_addr;
smp->type = SMP_T_IPV6;
break;
default:
return 0;
}
smp->flags = 0;
return 1;
}
/* set temp integer to the connection's source port */
static int
smp_fetch_sport(struct proxy *px, struct session *l4, void *l7, unsigned int opt,
const struct arg *args, struct sample *smp)
{
smp->type = SMP_T_UINT;
if (!(smp->data.uint = get_host_port(&l4->si[0].conn->addr.from)))
return 0;
smp->flags = 0;
return 1;
}
/* fetch the connection's destination IPv4/IPv6 address */
static int
smp_fetch_dst(struct proxy *px, struct session *l4, void *l7, unsigned int opt,
const struct arg *args, struct sample *smp)
{
conn_get_to_addr(l4->si[0].conn);
switch (l4->si[0].conn->addr.to.ss_family) {
case AF_INET:
smp->data.ipv4 = ((struct sockaddr_in *)&l4->si[0].conn->addr.to)->sin_addr;
smp->type = SMP_T_IPV4;
break;
case AF_INET6:
smp->data.ipv6 = ((struct sockaddr_in6 *)(&l4->si[0].conn->addr.to))->sin6_addr;
smp->type = SMP_T_IPV6;
break;
default:
return 0;
}
smp->flags = 0;
return 1;
}
/* set temp integer to the frontend connexion's destination port */
static int
smp_fetch_dport(struct proxy *px, struct session *l4, void *l7, unsigned int opt,
const struct arg *args, struct sample *smp)
{
conn_get_to_addr(l4->si[0].conn);
smp->type = SMP_T_UINT;
if (!(smp->data.uint = get_host_port(&l4->si[0].conn->addr.to)))
return 0;
smp->flags = 0;
return 1;
}
static int
smp_fetch_payload_lv(struct proxy *px, struct session *l4, void *l7, unsigned int opt,
const struct arg *arg_p, struct sample *smp)
{
unsigned int len_offset = arg_p[0].data.uint;
unsigned int len_size = arg_p[1].data.uint;
unsigned int buf_offset;
unsigned int buf_size = 0;
struct channel *chn;
int i;
/* Format is (len offset, len size, buf offset) or (len offset, len size) */
/* by default buf offset == len offset + len size */
/* buf offset could be absolute or relative to len offset + len size if prefixed by + or - */
if (!l4)
return 0;
chn = ((opt & SMP_OPT_DIR) == SMP_OPT_DIR_RES) ? l4->rep : l4->req;
if (!chn)
return 0;
if (len_offset + len_size > chn->buf->i)
goto too_short;
for (i = 0; i < len_size; i++) {
buf_size = (buf_size << 8) + ((unsigned char *)chn->buf->p)[i + len_offset];
}
/* buf offset may be implicit, absolute or relative */
buf_offset = len_offset + len_size;
if (arg_p[2].type == ARGT_UINT)
buf_offset = arg_p[2].data.uint;
else if (arg_p[2].type == ARGT_SINT)
buf_offset += arg_p[2].data.sint;
if (!buf_size || buf_size > chn->buf->size || buf_offset + buf_size > chn->buf->size) {
/* will never match */
smp->flags = 0;
return 0;
}
if (buf_offset + buf_size > chn->buf->i)
goto too_short;
/* init chunk as read only */
smp->type = SMP_T_CBIN;
chunk_initlen(&smp->data.str, chn->buf->p + buf_offset, 0, buf_size);
smp->flags = SMP_F_VOLATILE;
return 1;
too_short:
smp->flags = SMP_F_MAY_CHANGE;
return 0;
}
static int
smp_fetch_payload(struct proxy *px, struct session *l4, void *l7, unsigned int opt,
const struct arg *arg_p, struct sample *smp)
{
unsigned int buf_offset = arg_p[0].data.uint;
unsigned int buf_size = arg_p[1].data.uint;
struct channel *chn;
if (!l4)
return 0;
chn = ((opt & SMP_OPT_DIR) == SMP_OPT_DIR_RES) ? l4->rep : l4->req;
if (!chn)
return 0;
if (!buf_size || buf_size > chn->buf->size || buf_offset + buf_size > chn->buf->size) {
/* will never match */
smp->flags = 0;
return 0;
}
if (buf_offset + buf_size > chn->buf->i)
goto too_short;
/* init chunk as read only */
smp->type = SMP_T_CBIN;
chunk_initlen(&smp->data.str, chn->buf->p + buf_offset, 0, buf_size);
smp->flags = SMP_F_VOLATILE;
return 1;
too_short:
smp->flags = SMP_F_MAY_CHANGE;
return 0;
}
/* This function is used to validate the arguments passed to a "payload" fetch
* keyword. This keyword expects two positive integers, with the second one
* being strictly positive. It is assumed that the types are already the correct
* ones. Returns 0 on error, non-zero if OK. If <err_msg> is not NULL, it will be
* filled with a pointer to an error message in case of error, that the caller
* is responsible for freeing. The initial location must either be freeable or
* NULL.
*/
static int val_payload(struct arg *arg, char **err_msg)
{
if (!arg[1].data.uint) {
memprintf(err_msg, "payload length must be > 0");
return 0;
}
return 1;
}
/* This function is used to validate the arguments passed to a "payload_lv" fetch
* keyword. This keyword allows two positive integers and an optional signed one,
* with the second one being strictly positive and the third one being greater than
* the opposite of the two others if negative. It is assumed that the types are
* already the correct ones. Returns 0 on error, non-zero if OK. If <err_msg> is
* not NULL, it will be filled with a pointer to an error message in case of
* error, that the caller is responsible for freeing. The initial location must
* either be freeable or NULL.
*/
static int val_payload_lv(struct arg *arg, char **err_msg)
{
if (!arg[1].data.uint) {
memprintf(err_msg, "payload length must be > 0");
return 0;
}
if (arg[2].type == ARGT_SINT &&
(int)(arg[0].data.uint + arg[1].data.uint + arg[2].data.sint) < 0) {
memprintf(err_msg, "payload offset too negative");
return 0;
}
return 1;
}
#ifdef CONFIG_HAP_LINUX_TPROXY
/* parse the "transparent" bind keyword */
static int bind_parse_transparent(char **args, int cur_arg, struct proxy *px, struct bind_conf *conf, char **err)
{
struct listener *l;
list_for_each_entry(l, &conf->listeners, by_bind) {
if (l->addr.ss_family == AF_INET || l->addr.ss_family == AF_INET6)
l->options |= LI_O_FOREIGN;
}
return 0;
}
#endif
#ifdef TCP_DEFER_ACCEPT
/* parse the "defer-accept" bind keyword */
static int bind_parse_defer_accept(char **args, int cur_arg, struct proxy *px, struct bind_conf *conf, char **err)
{
struct listener *l;
list_for_each_entry(l, &conf->listeners, by_bind) {
if (l->addr.ss_family == AF_INET || l->addr.ss_family == AF_INET6)
l->options |= LI_O_DEF_ACCEPT;
}
return 0;
}
#endif
#ifdef TCP_FASTOPEN
/* parse the "defer-accept" bind keyword */
static int bind_parse_tfo(char **args, int cur_arg, struct proxy *px, struct bind_conf *conf, char **err)
{
struct listener *l;
list_for_each_entry(l, &conf->listeners, by_bind) {
if (l->addr.ss_family == AF_INET || l->addr.ss_family == AF_INET6)
l->options |= LI_O_TCP_FO;
}
return 0;
}
#endif
#ifdef TCP_MAXSEG
/* parse the "mss" bind keyword */
static int bind_parse_mss(char **args, int cur_arg, struct proxy *px, struct bind_conf *conf, char **err)
{
struct listener *l;
int mss;
if (!*args[cur_arg + 1]) {
memprintf(err, "'%s' : missing MSS value", args[cur_arg]);
return ERR_ALERT | ERR_FATAL;
}
mss = atoi(args[cur_arg + 1]);
if (!mss || abs(mss) > 65535) {
memprintf(err, "'%s' : expects an MSS with and absolute value between 1 and 65535", args[cur_arg]);
return ERR_ALERT | ERR_FATAL;
}
list_for_each_entry(l, &conf->listeners, by_bind) {
if (l->addr.ss_family == AF_INET || l->addr.ss_family == AF_INET6)
l->maxseg = mss;
}
return 0;
}
#endif
#ifdef SO_BINDTODEVICE
/* parse the "mss" bind keyword */
static int bind_parse_interface(char **args, int cur_arg, struct proxy *px, struct bind_conf *conf, char **err)
{
struct listener *l;
if (!*args[cur_arg + 1]) {
memprintf(err, "'%s' : missing interface name", args[cur_arg]);
return ERR_ALERT | ERR_FATAL;
}
list_for_each_entry(l, &conf->listeners, by_bind) {
if (l->addr.ss_family == AF_INET || l->addr.ss_family == AF_INET6)
l->interface = strdup(args[cur_arg + 1]);
}
global.last_checks |= LSTCHK_NETADM;
return 0;
}
#endif
static struct cfg_kw_list cfg_kws = {{ },{
{ CFG_LISTEN, "tcp-request", tcp_parse_tcp_req },
{ CFG_LISTEN, "tcp-response", tcp_parse_tcp_rep },
{ 0, NULL, NULL },
}};
/* Note: must not be declared <const> as its list will be overwritten.
* Please take care of keeping this list alphabetically sorted.
*/
static struct acl_kw_list acl_kws = {{ },{
{ "dst", acl_parse_ip, smp_fetch_dst, acl_match_ip, ACL_USE_TCP4_PERMANENT|ACL_MAY_LOOKUP, 0 },
{ "dst_port", acl_parse_int, smp_fetch_dport, acl_match_int, ACL_USE_TCP_PERMANENT, 0 },
{ "payload", acl_parse_str, smp_fetch_payload, acl_match_str, ACL_USE_L6REQ_VOLATILE|ACL_MAY_LOOKUP, ARG2(2,UINT,UINT), val_payload },
{ "payload_lv", acl_parse_str, smp_fetch_payload_lv, acl_match_str, ACL_USE_L6REQ_VOLATILE|ACL_MAY_LOOKUP, ARG3(2,UINT,UINT,SINT), val_payload_lv },
{ "req_rdp_cookie", acl_parse_str, smp_fetch_rdp_cookie, acl_match_str, ACL_USE_L6REQ_VOLATILE|ACL_MAY_LOOKUP, ARG1(0,STR) },
{ "req_rdp_cookie_cnt", acl_parse_int, acl_fetch_rdp_cookie_cnt, acl_match_int, ACL_USE_L6REQ_VOLATILE, ARG1(0,STR) },
{ "src", acl_parse_ip, smp_fetch_src, acl_match_ip, ACL_USE_TCP4_PERMANENT|ACL_MAY_LOOKUP, 0 },
{ "src_port", acl_parse_int, smp_fetch_sport, acl_match_int, ACL_USE_TCP_PERMANENT, 0 },
{ NULL, NULL, NULL, NULL },
}};
/* Note: must not be declared <const> as its list will be overwritten.
* Note: fetches that may return multiple types must be declared as the lowest
* common denominator, the type that can be casted into all other ones. For
* instance v4/v6 must be declared v4.
*/
static struct sample_fetch_kw_list sample_fetch_keywords = {{ },{
{ "src", smp_fetch_src, 0, NULL, SMP_T_IPV4, SMP_CAP_REQ|SMP_CAP_RES },
{ "dst", smp_fetch_dst, 0, NULL, SMP_T_IPV4, SMP_CAP_REQ|SMP_CAP_RES },
{ "dst_port", smp_fetch_dport, 0, NULL, SMP_T_UINT, SMP_CAP_REQ|SMP_CAP_RES },
{ "payload", smp_fetch_payload, ARG2(2,UINT,UINT), val_payload, SMP_T_CBIN, SMP_CAP_REQ|SMP_CAP_RES },
{ "payload_lv", smp_fetch_payload_lv, ARG3(2,UINT,UINT,SINT), val_payload_lv, SMP_T_CBIN, SMP_CAP_REQ|SMP_CAP_RES },
{ "rdp_cookie", smp_fetch_rdp_cookie, ARG1(1,STR), NULL, SMP_T_CSTR, SMP_CAP_REQ|SMP_CAP_RES },
{ "src_port", smp_fetch_sport, 0, NULL, SMP_T_UINT, SMP_CAP_REQ|SMP_CAP_RES },
{ NULL, NULL, 0, 0, 0 },
}};
/************************************************************************/
/* All supported bind keywords must be declared here. */
/************************************************************************/
/* Note: must not be declared <const> as its list will be overwritten.
* Please take care of keeping this list alphabetically sorted, doing so helps
* all code contributors.
* Optional keywords are also declared with a NULL ->parse() function so that
* the config parser can report an appropriate error when a known keyword was
* not enabled.
*/
static struct bind_kw_list bind_kws = { "TCP", { }, {
#ifdef TCP_DEFER_ACCEPT
{ "defer-accept", bind_parse_defer_accept, 0 }, /* wait for some data for 1 second max before doing accept */
#endif
#ifdef SO_BINDTODEVICE
{ "interface", bind_parse_interface, 1 }, /* specifically bind to this interface */
#endif
#ifdef TCP_MAXSEG
{ "mss", bind_parse_mss, 1 }, /* set MSS of listening socket */
#endif
#ifdef TCP_FASTOPEN
{ "tfo", bind_parse_tfo, 0 }, /* enable TCP_FASTOPEN of listening socket */
#endif
#ifdef CONFIG_HAP_LINUX_TPROXY
{ "transparent", bind_parse_transparent, 0 }, /* transparently bind to the specified addresses */
#endif
/* the versions with the NULL parse function*/
{ "defer-accept", NULL, 0 },
{ "interface", NULL, 1 },
{ "mss", NULL, 1 },
{ "transparent", NULL, 0 },
{ NULL, NULL, 0 },
}};
__attribute__((constructor))
static void __tcp_protocol_init(void)
{
protocol_register(&proto_tcpv4);
protocol_register(&proto_tcpv6);
sample_register_fetches(&sample_fetch_keywords);
cfg_register_keywords(&cfg_kws);
acl_register_keywords(&acl_kws);
bind_register_keywords(&bind_kws);
}
/*
* Local variables:
* c-indent-level: 8
* c-basic-offset: 8
* End:
*/