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 }