387b1cbcd692540068c9dbce96b5ab7ed76402d6
[dragonfly.git] / lib / libdmsg / service.c
1 /*
2  * Copyright (c) 2011-2012 The DragonFly Project.  All rights reserved.
3  *
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>
7  *
8  * Redistribution and use in source and binary forms, with or without
9  * modification, are permitted provided that the following conditions
10  * are met:
11  *
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
17  *    distribution.
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.
21  *
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
33  * SUCH DAMAGE.
34  */
35
36 #include "dmsg_local.h"
37
38 static void master_auth_signal(dmsg_router_t *router);
39 static void master_auth_rxmsg(dmsg_msg_t *msg);
40 static void master_link_signal(dmsg_router_t *router);
41 static void master_link_rxmsg(dmsg_msg_t *msg);
42
43 /*
44  * Service an accepted connection (runs as a pthread)
45  *
46  * (also called from a couple of other places)
47  */
48 void *
49 dmsg_master_service(void *data)
50 {
51         dmsg_master_service_info_t *info = data;
52         dmsg_iocom_t iocom;
53
54         if (info->detachme)
55                 pthread_detach(pthread_self());
56
57         dmsg_iocom_init(&iocom, info->fd, -1,
58                            master_auth_signal,
59                            master_auth_rxmsg,
60                            info->dbgmsg_callback,
61                            NULL);
62         dmsg_iocom_core(&iocom);
63
64         fprintf(stderr,
65                 "iocom on fd %d terminated error rx=%d, tx=%d\n",
66                 info->fd, iocom.ioq_rx.error, iocom.ioq_tx.error);
67         close(info->fd);
68         info->fd = -1;  /* safety */
69         if (info->exit_callback)
70                 info->exit_callback(info->handle);
71         free(info);
72
73         return (NULL);
74 }
75
76 /************************************************************************
77  *                          AUTHENTICATION                              *
78  ************************************************************************
79  *
80  * Callback via dmsg_iocom_core().
81  *
82  * Additional messaging-based authentication must occur before normal
83  * message operation.  The connection has already been encrypted at
84  * this point.
85  */
86 static void master_auth_conn_rx(dmsg_msg_t *msg);
87
88 static
89 void
90 master_auth_signal(dmsg_router_t *router)
91 {
92         dmsg_msg_t *msg;
93
94         /*
95          * Transmit LNK_CONN, enabling the SPAN protocol if both sides
96          * agree.
97          *
98          * XXX put additional authentication states here?
99          */
100         msg = dmsg_msg_alloc(router, 0, DMSG_LNK_CONN | DMSGF_CREATE,
101                              master_auth_conn_rx, NULL);
102         msg->any.lnk_conn.peer_mask = (uint64_t)-1;
103         msg->any.lnk_conn.peer_type = DMSG_PEER_CLUSTER;
104
105         dmsg_msg_write(msg);
106
107         dmsg_router_restate(router,
108                             master_link_signal,
109                             master_link_rxmsg,
110                             NULL);
111 }
112
113 static
114 void
115 master_auth_conn_rx(dmsg_msg_t *msg)
116 {
117         if (msg->any.head.cmd & DMSGF_DELETE)
118                 dmsg_msg_reply(msg, 0);
119 }
120
121 static
122 void
123 master_auth_rxmsg(dmsg_msg_t *msg __unused)
124 {
125 }
126
127 /************************************************************************
128  *                      POST-AUTHENTICATION SERVICE MSGS                *
129  ************************************************************************
130  *
131  * Callback via dmsg_iocom_core().
132  */
133 static
134 void
135 master_link_signal(dmsg_router_t *router)
136 {
137         dmsg_msg_lnk_signal(router);
138 }
139
140 static
141 void
142 master_link_rxmsg(dmsg_msg_t *msg)
143 {
144         dmsg_state_t *state;
145         uint32_t cmd;
146
147         /*
148          * If the message state has a function established we just
149          * call the function, otherwise we call the appropriate
150          * link-level protocol related to the original command and
151          * let it sort it out.
152          *
153          * Non-transactional one-off messages, on the otherhand,
154          * might have REPLY set.
155          */
156         state = msg->state;
157         cmd = state ? state->msg->any.head.cmd : msg->any.head.cmd;
158
159         fprintf(stderr, "service-receive: %s\n", dmsg_msg_str(msg));
160
161         if (state && state->func) {
162                 assert(state->func != NULL);
163                 state->func(msg);
164         } else {
165                 switch(cmd & DMSGF_PROTOS) {
166                 case DMSG_PROTO_LNK:
167                         dmsg_msg_lnk(msg);
168                         break;
169                 case DMSG_PROTO_DBG:
170                         dmsg_msg_dbg(msg);
171                         break;
172                 default:
173                         dmsg_msg_reply(msg, DMSG_ERR_NOSUPP);
174                         break;
175                 }
176         }
177 }
178
179 /*
180  * This is called from the master node to process a received debug
181  * shell command.  We process the command, outputting the results,
182  * then finish up by outputting another prompt.
183  */
184 void
185 dmsg_msg_dbg(dmsg_msg_t *msg)
186 {
187         switch(msg->any.head.cmd & DMSGF_CMDSWMASK) {
188         case DMSG_DBG_SHELL:
189                 /*
190                  * This is a command which we must process.
191                  * When we are finished we generate a final reply.
192                  */
193                 if (msg->aux_data)
194                         msg->aux_data[msg->aux_size - 1] = 0;
195                 msg->router->dbgmsg_callback(msg);
196                 dmsg_msg_reply(msg, 0);
197                 break;
198         case DMSG_DBG_SHELL | DMSGF_REPLY:
199                 /*
200                  * A reply just prints out the string.  No newline is added
201                  * (it is expected to be embedded if desired).
202                  */
203                 if (msg->aux_data)
204                         msg->aux_data[msg->aux_size - 1] = 0;
205                 if (msg->aux_data)
206                         write(2, msg->aux_data, strlen(msg->aux_data));
207                 break;
208         default:
209                 dmsg_msg_reply(msg, DMSG_ERR_NOSUPP);
210                 break;
211         }
212 }
213
214 /*
215  * Returns text debug output to the original defined by (msg).  (msg) is
216  * not modified and stays intact.  We use a one-way message with REPLY set
217  * to distinguish between a debug command and debug terminal output.
218  *
219  * To prevent loops router_printf() can filter the message (cmd) related
220  * to the router_printf().  We filter out DBG messages.
221  */
222 void
223 dmsg_router_printf(dmsg_router_t *router, const char *ctl, ...)
224 {
225         dmsg_msg_t *rmsg;
226         va_list va;
227         char buf[1024];
228         size_t len;
229
230         va_start(va, ctl);
231         vsnprintf(buf, sizeof(buf), ctl, va);
232         va_end(va);
233         len = strlen(buf) + 1;
234
235         rmsg = dmsg_msg_alloc(router, len, DMSG_DBG_SHELL | DMSGF_REPLY,
236                                  NULL, NULL);
237         bcopy(buf, rmsg->aux_data, len);
238
239         dmsg_msg_write(rmsg);
240 }