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
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25 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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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 * Callback via hammer2_iocom_core().
183 * Additional messaging-based authentication must occur before normal
184 * message operation. The connection has already been encrypted at
189 master_auth_rx(hammer2_iocom_t *iocom __unused)
192 iocom->recvmsg_callback = master_link_rx;
193 iocom->sendmsg_callback = master_link_tx;
198 master_auth_tx(hammer2_iocom_t *iocom __unused)
201 iocom->recvmsg_callback = master_link_rx;
202 iocom->sendmsg_callback = master_link_tx;
205 /************************************************************************
206 * POST-AUTHENTICATION SERVICE MSGS *
207 ************************************************************************
209 * Callback via hammer2_iocom_core().
213 master_link_rx(hammer2_iocom_t *iocom)
216 hammer2_state_t *state;
219 while ((iocom->flags & HAMMER2_IOCOMF_EOF) == 0 &&
220 (msg = hammer2_ioq_read(iocom)) != NULL) {
222 * If the message state has a function established we just
223 * call the function, otherwise we call the appropriate
224 * link-level protocol related to the original command and
225 * let it sort it out.
227 * Non-transactional one-off messages, on the otherhand,
228 * might have REPLY set.
232 cmd = state->msg->any.head.cmd;
234 "MSGRX persist=%08x cmd=%08x error %d\n",
235 cmd, msg->any.head.cmd, msg->any.head.error);
237 cmd = msg->any.head.cmd;
239 "MSGRX persist=-------- cmd=%08x error %d\n",
240 cmd, msg->any.head.error);
242 if (state && state->func) {
243 state->func(state, msg);
245 switch(cmd & HAMMER2_MSGF_PROTOS) {
246 case HAMMER2_MSG_PROTO_LNK:
247 hammer2_msg_lnk(iocom, msg);
249 case HAMMER2_MSG_PROTO_DBG:
250 hammer2_msg_dbg(iocom, msg);
253 hammer2_msg_reply(iocom, msg,
254 HAMMER2_MSG_ERR_UNKNOWN);
258 hammer2_state_cleanuprx(iocom, msg);
260 if (iocom->ioq_rx.error) {
262 "master_recv: comm error %d\n",
263 iocom->ioq_rx.error);
268 * Callback from hammer2_iocom_core() when messages might be transmittable
273 master_link_tx(hammer2_iocom_t *iocom)
275 hammer2_iocom_flush1(iocom);