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
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30 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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32 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
38 static void *node_master_accept(void *data);
39 static void *node_master_service(void *data);
40 static void node_master_recv(hammer2_iocom_t *iocom);
41 static void node_master_send(hammer2_iocom_t *iocom);
44 * Start-up the master listener daemon for the machine.
46 * The master listener serves as a rendezvous point in the cluster, accepting
47 * connections, performing registrations and authentications, maintaining
48 * the spanning tree, and keeping track of message state so disconnects can
49 * be handled properly.
51 * Once authenticated only low-level messaging protocols (which includes
52 * tracking persistent messages) are handled by this daemon. This daemon
53 * does not run the higher level quorum or locking protocols.
55 * This daemon can also be told to maintain connections to other nodes,
56 * forming a messaging backbone, which in turn allows PFS's (if desired) to
57 * simply connect to the master daemon via localhost if desired.
58 * Backbones are specified via /etc/hammer2.conf.
63 struct sockaddr_in lsin;
68 * Acquire socket and set options
70 if ((lfd = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
71 fprintf(stderr, "node_master_listen: socket(): %s\n",
76 setsockopt(lfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
79 * Setup listen port and try to bind. If the bind fails we assume
80 * that a master listener process is already running and silently
83 bzero(&lsin, sizeof(lsin));
84 lsin.sin_family = AF_INET;
85 lsin.sin_addr.s_addr = INADDR_ANY;
86 lsin.sin_port = htons(HAMMER2_LISTEN_PORT);
87 if (bind(lfd, (struct sockaddr *)&lsin, sizeof(lsin)) < 0) {
89 fprintf(stderr, "master listen: daemon already running\n");
92 fprintf(stderr, "master listen: startup\n");
96 * Fork and disconnect the controlling terminal and parent process,
97 * executing the specified function as a pthread.
99 * Returns to the original process which can then continue running.
100 * In debug mode this call will create the pthread without forking
101 * and set NormalExit to 0, instead of fork.
103 hammer2_demon(node_master_accept, (void *)(intptr_t)lfd);
110 * Master listen/accept thread. Accept connections on the master socket,
111 * starting a pthread for each one.
115 node_master_accept(void *data)
117 struct sockaddr_in asin;
120 int lfd = (int)(intptr_t)data;
124 * Nobody waits for us
126 setproctitle("hammer2 master listen");
127 pthread_detach(pthread_self());
130 * Accept connections and create pthreads to handle them after
135 fd = accept(lfd, (struct sockaddr *)&asin, &alen);
142 fprintf(stderr, "node_master_accept: accept fd %d\n", fd);
143 pthread_create(&thread, NULL,
144 node_master_service, (void *)(intptr_t)fd);
150 * Service an accepted connection (runs as a pthread)
154 node_master_service(void *data)
156 hammer2_iocom_t iocom;
159 fd = (int)(intptr_t)data;
160 hammer2_iocom_init(&iocom, fd, -1);
161 hammer2_iocom_core(&iocom, node_master_recv, node_master_send, NULL);
164 "iocom on fd %d terminated error rx=%d, tx=%d\n",
165 fd, iocom.ioq_rx.error, iocom.ioq_tx.error);
172 * Callback from hammer2_iocom_core() when messages might be present
177 node_master_recv(hammer2_iocom_t *iocom)
181 while ((iocom->flags & HAMMER2_IOCOMF_EOF) == 0 &&
182 (msg = hammer2_ioq_read(iocom)) != NULL) {
183 fprintf(stderr, "MSG RECEIVED: %08x error %d\n",
184 msg->any.head.cmd, msg->any.head.error);
185 switch(msg->any.head.cmd & HAMMER2_MSGF_CMDSWMASK) {
186 case HAMMER2_LNK_ERROR:
188 case HAMMER2_DBG_SHELL:
189 case HAMMER2_DBG_SHELL | HAMMER2_MSGF_REPLY:
190 hammer2_debug_remote(msg);
193 hammer2_replymsg(msg, HAMMER2_MSG_ERR_UNKNOWN);
197 if (iocom->ioq_rx.error) {
199 "node_master_recv: comm error %d\n",
200 iocom->ioq_rx.error);
205 * Callback from hammer2_iocom_core() when messages might be transmittable
210 node_master_send(hammer2_iocom_t *iocom)
212 hammer2_iocom_flush(iocom);