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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38 static void *master_accept(void *data);
39 static void master_auth_state(hammer2_iocom_t *iocom);
40 static void master_auth_rxmsg(hammer2_iocom_t *iocom, hammer2_msg_t *msg);
41 static void master_link_state(hammer2_iocom_t *iocom);
42 static void master_link_rxmsg(hammer2_iocom_t *iocom, hammer2_msg_t *msg);
45 * Start-up the master listener daemon for the machine.
47 * The master listener serves as a rendezvous point in the cluster, accepting
48 * connections, performing registrations and authentications, maintaining
49 * the spanning tree, and keeping track of message state so disconnects can
50 * be handled properly.
52 * Once authenticated only low-level messaging protocols (which includes
53 * tracking persistent messages) are handled by this daemon. This daemon
54 * does not run the higher level quorum or locking protocols.
56 * This daemon can also be told to maintain connections to other nodes,
57 * forming a messaging backbone, which in turn allows PFS's (if desired) to
58 * simply connect to the master daemon via localhost if desired.
59 * Backbones are specified via /etc/hammer2.conf.
64 struct sockaddr_in lsin;
69 * Acquire socket and set options
71 if ((lfd = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
72 fprintf(stderr, "master_listen: socket(): %s\n",
77 setsockopt(lfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
80 * Setup listen port and try to bind. If the bind fails we assume
81 * that a master listener process is already running and silently
84 bzero(&lsin, sizeof(lsin));
85 lsin.sin_family = AF_INET;
86 lsin.sin_addr.s_addr = INADDR_ANY;
87 lsin.sin_port = htons(HAMMER2_LISTEN_PORT);
88 if (bind(lfd, (struct sockaddr *)&lsin, sizeof(lsin)) < 0) {
92 "master listen: daemon already running\n");
97 fprintf(stderr, "master listen: startup\n");
101 * Fork and disconnect the controlling terminal and parent process,
102 * executing the specified function as a pthread.
104 * Returns to the original process which can then continue running.
105 * In debug mode this call will create the pthread without forking
106 * and set NormalExit to 0, instead of fork.
108 hammer2_demon(master_accept, (void *)(intptr_t)lfd);
115 * Master listen/accept thread. Accept connections on the master socket,
116 * starting a pthread for each one.
120 master_accept(void *data)
122 struct sockaddr_in asin;
125 int lfd = (int)(intptr_t)data;
129 * Nobody waits for us
131 setproctitle("hammer2 master listen");
132 pthread_detach(pthread_self());
135 * Accept connections and create pthreads to handle them after
140 fd = accept(lfd, (struct sockaddr *)&asin, &alen);
147 fprintf(stderr, "master_accept: accept fd %d\n", fd);
148 pthread_create(&thread, NULL,
149 master_service, (void *)(intptr_t)fd);
155 * Service an accepted connection (runs as a pthread)
157 * (also called from a couple of other places)
160 master_service(void *data)
162 hammer2_iocom_t iocom;
165 fd = (int)(intptr_t)data;
166 hammer2_iocom_init(&iocom, fd, -1,
167 master_auth_state, master_auth_rxmsg, NULL);
168 hammer2_iocom_core(&iocom);
171 "iocom on fd %d terminated error rx=%d, tx=%d\n",
172 fd, iocom.ioq_rx.error, iocom.ioq_tx.error);
178 /************************************************************************
180 ************************************************************************
182 * Callback via hammer2_iocom_core().
184 * Additional messaging-based authentication must occur before normal
185 * message operation. The connection has already been encrypted at
188 static void master_auth_conn_rx(hammer2_state_t *state, hammer2_msg_t *msg);
192 master_auth_state(hammer2_iocom_t *iocom __unused)
197 * Transmit LNK_CONN, enabling the SPAN protocol if both sides
200 * XXX put additional authentication states here
202 msg = hammer2_msg_alloc(iocom, 0, HAMMER2_LNK_CONN |
203 HAMMER2_MSGF_CREATE);
204 snprintf(msg->any.lnk_conn.label, sizeof(msg->any.lnk_conn.label), "*");
205 hammer2_msg_write(iocom, msg, master_auth_conn_rx, NULL, NULL);
207 hammer2_iocom_restate(iocom,
208 master_link_state, master_link_rxmsg, NULL);
213 master_auth_conn_rx(hammer2_state_t *state, hammer2_msg_t *msg)
215 if (msg->any.head.cmd & HAMMER2_MSGF_DELETE)
216 hammer2_msg_reply(state->iocom, msg, 0);
221 master_auth_rxmsg(hammer2_iocom_t *iocom __unused, hammer2_msg_t *msg __unused)
225 /************************************************************************
226 * POST-AUTHENTICATION SERVICE MSGS *
227 ************************************************************************
229 * Callback via hammer2_iocom_core().
233 master_link_state(hammer2_iocom_t *iocom __unused)
239 master_link_rxmsg(hammer2_iocom_t *iocom, hammer2_msg_t *msg)
241 hammer2_state_t *state;
245 * If the message state has a function established we just
246 * call the function, otherwise we call the appropriate
247 * link-level protocol related to the original command and
248 * let it sort it out.
250 * Non-transactional one-off messages, on the otherhand,
251 * might have REPLY set.
254 cmd = state ? state->msg->any.head.cmd : msg->any.head.cmd;
256 fprintf(stderr, "service-receive: %s\n", hammer2_msg_str(msg));
258 if (state && state->func) {
259 assert(state->func != NULL);
260 state->func(state, msg);
262 switch(cmd & HAMMER2_MSGF_PROTOS) {
263 case HAMMER2_MSG_PROTO_LNK:
264 hammer2_msg_lnk(iocom, msg);
266 case HAMMER2_MSG_PROTO_DBG:
267 hammer2_msg_dbg(iocom, msg);
270 hammer2_msg_reply(iocom, msg, HAMMER2_MSG_ERR_NOSUPP);