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337edfdbc5
The protocol selection is currently performed based on the family, control type and socket type. But this is often not enough, as both only provide DGRAM or STREAM, leaving few variants. Protocols like SCTP for example might be indistinguishable from TCP here. Same goes for TCP extensions like MPTCP. This commit introduces a new enum proto_type that is placed in each and every protocol definition, that will usually more or less match the sock_type, but being an enum, will support additional values.
153 lines
4.6 KiB
C
153 lines
4.6 KiB
C
/*
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* DGRAM protocol layer on top of AF_UNIX
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*
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* Copyright 2020 HAProxy Technologies, Emeric Brun <ebrun@haproxy.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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*/
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#include <ctype.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#include <sys/param.h>
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#include <sys/socket.h>
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#include <sys/types.h>
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#include <sys/un.h>
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#include <haproxy/fd.h>
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#include <haproxy/listener.h>
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#include <haproxy/log.h>
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#include <haproxy/namespace.h>
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#include <haproxy/protocol.h>
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#include <haproxy/sock.h>
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#include <haproxy/sock_unix.h>
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static int uxdg_bind_listener(struct listener *listener, char *errmsg, int errlen);
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static void uxdg_enable_listener(struct listener *listener);
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static void uxdg_disable_listener(struct listener *listener);
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static int uxdg_suspend_receiver(struct receiver *rx);
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/* Note: must not be declared <const> as its list will be overwritten */
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struct protocol proto_uxdg = {
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.name = "uxdg",
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/* connection layer */
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.ctrl_type = SOCK_DGRAM,
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.listen = uxdg_bind_listener,
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.enable = uxdg_enable_listener,
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.disable = uxdg_disable_listener,
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.add = default_add_listener,
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.unbind = default_unbind_listener,
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.suspend = default_suspend_listener,
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.resume = default_resume_listener,
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/* binding layer */
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.rx_suspend = uxdg_suspend_receiver,
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/* address family */
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.fam = &proto_fam_unix,
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/* socket layer */
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.proto_type = PROTO_TYPE_DGRAM,
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.sock_type = SOCK_DGRAM,
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.sock_prot = 0,
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.rx_enable = sock_enable,
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.rx_disable = sock_disable,
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.rx_unbind = sock_unbind,
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.receivers = LIST_HEAD_INIT(proto_uxdg.receivers),
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.nb_receivers = 0,
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};
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INITCALL1(STG_REGISTER, protocol_register, &proto_uxdg);
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/* This function tries to bind dgram unix socket listener. It may return a warning or
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* an error message in <errmsg> if the message is at most <errlen> bytes long
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* (including '\0'). Note that <errmsg> may be NULL if <errlen> is also zero.
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* The return value is composed from ERR_ABORT, ERR_WARN,
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* ERR_ALERT, ERR_RETRYABLE and ERR_FATAL. ERR_NONE indicates that everything
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* was alright and that no message was returned. ERR_RETRYABLE means that an
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* error occurred but that it may vanish after a retry (eg: port in use), and
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* ERR_FATAL indicates a non-fixable error. ERR_WARN and ERR_ALERT do not alter
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* the meaning of the error, but just indicate that a message is present which
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* should be displayed with the respective level. Last, ERR_ABORT indicates
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* that it's pointless to try to start other listeners. No error message is
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* returned if errlen is NULL.
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*/
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int uxdg_bind_listener(struct listener *listener, char *errmsg, int errlen)
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{
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int err = ERR_NONE;
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char *msg = NULL;
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/* ensure we never return garbage */
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if (errlen)
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*errmsg = 0;
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if (listener->state != LI_ASSIGNED)
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return ERR_NONE; /* already bound */
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if (!(listener->rx.flags & RX_F_BOUND)) {
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msg = "receiving socket not bound";
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goto uxdg_return;
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}
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listener_set_state(listener, LI_LISTEN);
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uxdg_return:
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if (msg && errlen) {
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const char *path = ((struct sockaddr_un *)&listener->rx.addr)->sun_path;
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snprintf(errmsg, errlen, "%s for [%s]", msg, path);
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}
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return err;
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}
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/* Enable receipt of incoming connections for listener <l>. The receiver must
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* still be valid.
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*/
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static void uxdg_enable_listener(struct listener *l)
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{
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fd_want_recv_safe(l->rx.fd);
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}
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/* Disable receipt of incoming connections for listener <l>. The receiver must
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* still be valid.
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*/
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static void uxdg_disable_listener(struct listener *l)
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{
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fd_stop_recv(l->rx.fd);
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}
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/* Suspend a receiver. Returns < 0 in case of failure, 0 if the receiver
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* was totally stopped, or > 0 if correctly suspended. Nothing is done for
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* plain unix sockets since currently it's the new process which handles
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* the renaming. Abstract sockets are completely unbound and closed so
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* there's no need to stop the poller.
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*/
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static int uxdg_suspend_receiver(struct receiver *rx)
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{
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struct listener *l = LIST_ELEM(rx, struct listener *, rx);
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if (((struct sockaddr_un *)&rx->addr)->sun_path[0])
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return 1;
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/* Listener's lock already held. Call lockless version of
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* unbind_listener. */
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do_unbind_listener(l);
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return 0;
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}
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/*
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* Local variables:
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* c-indent-level: 8
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* c-basic-offset: 8
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* End:
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*/
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