2 * Copyright (c) 2011-2012 The DragonFly Project. All rights reserved.
4 * This code is derived from software contributed to The DragonFly Project
5 * by Matthew Dillon <dillon@dragonflybsd.org>
6 * by Venkatesh Srinivas <vsrinivas@dragonflybsd.org>
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in
16 * the documentation and/or other materials provided with the
18 * 3. Neither the name of The DragonFly Project nor the names of its
19 * contributors may be used to endorse or promote products derived
20 * from this software without specific, prior written permission.
22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
23 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
24 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
25 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
26 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
27 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
28 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
29 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
30 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
31 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
32 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
38 static void *master_accept(void *data);
39 static void *master_service(void *data);
40 static void master_auth_rx(hammer2_iocom_t *iocom);
41 static void master_auth_tx(hammer2_iocom_t *iocom);
42 static void master_link_rx(hammer2_iocom_t *iocom);
43 static void master_link_tx(hammer2_iocom_t *iocom);
46 * Start-up the master listener daemon for the machine.
48 * The master listener serves as a rendezvous point in the cluster, accepting
49 * connections, performing registrations and authentications, maintaining
50 * the spanning tree, and keeping track of message state so disconnects can
51 * be handled properly.
53 * Once authenticated only low-level messaging protocols (which includes
54 * tracking persistent messages) are handled by this daemon. This daemon
55 * does not run the higher level quorum or locking protocols.
57 * This daemon can also be told to maintain connections to other nodes,
58 * forming a messaging backbone, which in turn allows PFS's (if desired) to
59 * simply connect to the master daemon via localhost if desired.
60 * Backbones are specified via /etc/hammer2.conf.
65 struct sockaddr_in lsin;
70 * Acquire socket and set options
72 if ((lfd = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
73 fprintf(stderr, "master_listen: socket(): %s\n",
78 setsockopt(lfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
81 * Setup listen port and try to bind. If the bind fails we assume
82 * that a master listener process is already running and silently
85 bzero(&lsin, sizeof(lsin));
86 lsin.sin_family = AF_INET;
87 lsin.sin_addr.s_addr = INADDR_ANY;
88 lsin.sin_port = htons(HAMMER2_LISTEN_PORT);
89 if (bind(lfd, (struct sockaddr *)&lsin, sizeof(lsin)) < 0) {
93 "master listen: daemon already running\n");
98 fprintf(stderr, "master listen: startup\n");
102 * Fork and disconnect the controlling terminal and parent process,
103 * executing the specified function as a pthread.
105 * Returns to the original process which can then continue running.
106 * In debug mode this call will create the pthread without forking
107 * and set NormalExit to 0, instead of fork.
109 hammer2_demon(master_accept, (void *)(intptr_t)lfd);
116 * Master listen/accept thread. Accept connections on the master socket,
117 * starting a pthread for each one.
121 master_accept(void *data)
123 struct sockaddr_in asin;
126 int lfd = (int)(intptr_t)data;
130 * Nobody waits for us
132 setproctitle("hammer2 master listen");
133 pthread_detach(pthread_self());
136 * Accept connections and create pthreads to handle them after
141 fd = accept(lfd, (struct sockaddr *)&asin, &alen);
148 fprintf(stderr, "master_accept: accept fd %d\n", fd);
149 pthread_create(&thread, NULL,
150 master_service, (void *)(intptr_t)fd);
156 * Service an accepted connection (runs as a pthread)
160 master_service(void *data)
162 hammer2_iocom_t iocom;
165 fd = (int)(intptr_t)data;
166 hammer2_iocom_init(&iocom, fd, -1);
167 hammer2_iocom_core(&iocom, master_auth_rx, master_auth_tx, NULL);
170 "iocom on fd %d terminated error rx=%d, tx=%d\n",
171 fd, iocom.ioq_rx.error, iocom.ioq_tx.error);
177 /************************************************************************
179 ************************************************************************
181 * Additional messaging-based authentication must occur before normal
182 * message operation. The connection has already been encrypted at
187 master_auth_rx(hammer2_iocom_t *iocom __unused)
190 iocom->recvmsg_callback = master_link_rx;
191 iocom->sendmsg_callback = master_link_tx;
196 master_auth_tx(hammer2_iocom_t *iocom __unused)
199 iocom->recvmsg_callback = master_link_rx;
200 iocom->sendmsg_callback = master_link_tx;
204 * Callback from hammer2_iocom_core() when messages might be present
209 master_link_rx(hammer2_iocom_t *iocom)
213 while ((iocom->flags & HAMMER2_IOCOMF_EOF) == 0 &&
214 (msg = hammer2_ioq_read(iocom)) != NULL) {
215 fprintf(stderr, "MSG RECEIVED: %08x error %d\n",
216 msg->any.head.cmd, msg->any.head.error);
217 switch(msg->any.head.cmd & HAMMER2_MSGF_CMDSWMASK) {
218 case HAMMER2_LNK_ERROR:
220 case HAMMER2_DBG_SHELL:
221 case HAMMER2_DBG_SHELL | HAMMER2_MSGF_REPLY:
222 hammer2_shell_remote(iocom, msg);
225 hammer2_msg_reply(iocom, msg, HAMMER2_MSG_ERR_UNKNOWN);
228 hammer2_state_cleanuprx(iocom, msg);
230 if (iocom->ioq_rx.error) {
232 "master_recv: comm error %d\n",
233 iocom->ioq_rx.error);
238 * Callback from hammer2_iocom_core() when messages might be transmittable
243 master_link_tx(hammer2_iocom_t *iocom)
245 hammer2_iocom_flush(iocom);