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         free(info);
  70
  71         return (NULL);
  72 }
  73
  74 /************************************************************************
  75  *                          AUTHENTICATION                              *
  76  ************************************************************************
  77  *
  78  * Callback via dmsg_iocom_core().
  79  *
  80  * Additional messaging-based authentication must occur before normal
  81  * message operation.  The connection has already been encrypted at
  82  * this point.
  83  */
  84 static void master_auth_conn_rx(dmsg_msg_t *msg);
  85
  86 static
  87 void
  88 master_auth_signal(dmsg_router_t *router)
  89 {
  90         dmsg_msg_t *msg;
  91
  92         /*
  93          * Transmit LNK_CONN, enabling the SPAN protocol if both sides
  94          * agree.
  95          *
  96          * XXX put additional authentication states here?
  97          */
  98         msg = dmsg_msg_alloc(router, 0, DMSG_LNK_CONN | DMSGF_CREATE,
  99                              master_auth_conn_rx, NULL);
 100         msg->any.lnk_conn.peer_mask = (uint64_t)-1;
 101         msg->any.lnk_conn.peer_type = DMSG_PEER_CLUSTER;
 102
 103         dmsg_msg_write(msg);
 104
 105         dmsg_router_restate(router,
 106                             master_link_signal,
 107                             master_link_rxmsg,
 108                             NULL);
 109 }
 110
 111 static
 112 void
 113 master_auth_conn_rx(dmsg_msg_t *msg)
 114 {
 115         if (msg->any.head.cmd & DMSGF_DELETE)
 116                 dmsg_msg_reply(msg, 0);
 117 }
 118
 119 static
 120 void
 121 master_auth_rxmsg(dmsg_msg_t *msg __unused)
 122 {
 123 }
 124
 125 /************************************************************************
 126  *                      POST-AUTHENTICATION SERVICE MSGS                *
 127  ************************************************************************
 128  *
 129  * Callback via dmsg_iocom_core().
 130  */
 131 static
 132 void
 133 master_link_signal(dmsg_router_t *router)
 134 {
 135         dmsg_msg_lnk_signal(router);
 136 }
 137
 138 static
 139 void
 140 master_link_rxmsg(dmsg_msg_t *msg)
 141 {
 142         dmsg_state_t *state;
 143         uint32_t cmd;
 144
 145         /*
 146          * If the message state has a function established we just
 147          * call the function, otherwise we call the appropriate
 148          * link-level protocol related to the original command and
 149          * let it sort it out.
 150          *
 151          * Non-transactional one-off messages, on the otherhand,
 152          * might have REPLY set.
 153          */
 154         state = msg->state;
 155         cmd = state ? state->msg->any.head.cmd : msg->any.head.cmd;
 156
 157         fprintf(stderr, "service-receive: %s\n", dmsg_msg_str(msg));
 158
 159         if (state && state->func) {
 160                 assert(state->func != NULL);
 161                 state->func(msg);
 162         } else {
 163                 switch(cmd & DMSGF_PROTOS) {
 164                 case DMSG_PROTO_LNK:
 165                         dmsg_msg_lnk(msg);
 166                         break;
 167                 case DMSG_PROTO_DBG:
 168                         dmsg_msg_dbg(msg);
 169                         break;
 170                 default:
 171                         dmsg_msg_reply(msg, DMSG_ERR_NOSUPP);
 172                         break;
 173                 }
 174         }
 175 }
 176
 177 /*
 178  * This is called from the master node to process a received debug
 179  * shell command.  We process the command, outputting the results,
 180  * then finish up by outputting another prompt.
 181  */
 182 void
 183 dmsg_msg_dbg(dmsg_msg_t *msg)
 184 {
 185         switch(msg->any.head.cmd & DMSGF_CMDSWMASK) {
 186         case DMSG_DBG_SHELL:
 187                 /*
 188                  * This is a command which we must process.
 189                  * When we are finished we generate a final reply.
 190                  */
 191                 if (msg->aux_data)
 192                         msg->aux_data[msg->aux_size - 1] = 0;
 193                 msg->router->dbgmsg_callback(msg);
 194                 dmsg_msg_reply(msg, 0);
 195                 break;
 196         case DMSG_DBG_SHELL | DMSGF_REPLY:
 197                 /*
 198                  * A reply just prints out the string.  No newline is added
 199                  * (it is expected to be embedded if desired).
 200                  */
 201                 if (msg->aux_data)
 202                         msg->aux_data[msg->aux_size - 1] = 0;
 203                 if (msg->aux_data)
 204                         write(2, msg->aux_data, strlen(msg->aux_data));
 205                 break;
 206         default:
 207                 dmsg_msg_reply(msg, DMSG_ERR_NOSUPP);
 208                 break;
 209         }
 210 }
 211
 212 /*
 213  * Returns text debug output to the original defined by (msg).  (msg) is
 214  * not modified and stays intact.  We use a one-way message with REPLY set
 215  * to distinguish between a debug command and debug terminal output.
 216  *
 217  * To prevent loops router_printf() can filter the message (cmd) related
 218  * to the router_printf().  We filter out DBG messages.
 219  */
 220 void
 221 dmsg_router_printf(dmsg_router_t *router, const char *ctl, ...)
 222 {
 223         dmsg_msg_t *rmsg;
 224         va_list va;
 225         char buf[1024];
 226         size_t len;
 227
 228         va_start(va, ctl);
 229         vsnprintf(buf, sizeof(buf), ctl, va);
 230         va_end(va);
 231         len = strlen(buf) + 1;
 232
 233         rmsg = dmsg_msg_alloc(router, len, DMSG_DBG_SHELL | DMSGF_REPLY,
 234                                  NULL, NULL);
 235         bcopy(buf, rmsg->aux_data, len);
 236
 237         dmsg_msg_write(rmsg);
 238 }