lib/libdmsg/service.c

   1 /*
   2  * Copyright (c) 2011-2014 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_iocom_t *iocom);
  39 static void master_auth_rxmsg(dmsg_msg_t *msg);
  40 static void master_link_signal(dmsg_iocom_t *iocom);
  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,
  58                         info->fd,
  59                         (info->altmsg_callback ? info->altfd : -1),
  60                         master_auth_signal,
  61                         master_auth_rxmsg,
  62                         info->usrmsg_callback,
  63                         info->altmsg_callback);
  64         if (info->noclosealt)
  65                 iocom.flags &= ~DMSG_IOCOMF_CLOSEALT;
  66         if (info->label) {
  67                 dmsg_iocom_label(&iocom, "%s", info->label);
  68                 free(info->label);
  69                 info->label = NULL;
  70         }
  71         dmsg_iocom_core(&iocom);
  72         dmsg_iocom_done(&iocom);
  73
  74         dmio_printf(iocom, 1,
  75                     "iocom on fd %d terminated error rx=%d, tx=%d\n",
  76                     info->fd, iocom.ioq_rx.error, iocom.ioq_tx.error);
  77         close(info->fd);
  78         info->fd = -1;  /* safety */
  79         if (info->exit_callback)
  80                 info->exit_callback(info->handle);
  81         free(info);
  82
  83         return (NULL);
  84 }
  85
  86 /************************************************************************
  87  *                          AUTHENTICATION                              *
  88  ************************************************************************
  89  *
  90  * Callback via dmsg_iocom_core().
  91  *
  92  * Additional messaging-based authentication must occur before normal
  93  * message operation.  The connection has already been encrypted at
  94  * this point.
  95  */
  96 static void master_auth_conn_rx(dmsg_msg_t *msg);
  97
  98 static
  99 void
 100 master_auth_signal(dmsg_iocom_t *iocom)
 101 {
 102         dmsg_msg_t *msg;
 103
 104         /*
 105          * Transmit LNK_CONN, enabling the SPAN protocol if both sides
 106          * agree.
 107          *
 108          * XXX put additional authentication states here?
 109          */
 110         msg = dmsg_msg_alloc(&iocom->state0, 0,
 111                              DMSG_LNK_CONN | DMSGF_CREATE,
 112                              master_auth_conn_rx, NULL);
 113         msg->any.lnk_conn.peer_mask = (uint64_t)-1;
 114         msg->any.lnk_conn.peer_type = DMSG_PEER_ROUTER;
 115         msg->any.lnk_conn.peer_mask = (uint64_t)-1;
 116
 117         dmsg_msg_write(msg);
 118
 119         dmsg_iocom_restate(iocom, master_link_signal, master_link_rxmsg);
 120 }
 121
 122 static
 123 void
 124 master_auth_conn_rx(dmsg_msg_t *msg)
 125 {
 126         if (msg->any.head.cmd & DMSGF_DELETE)
 127                 dmsg_msg_reply(msg, 0);
 128 }
 129
 130 static
 131 void
 132 master_auth_rxmsg(dmsg_msg_t *msg __unused)
 133 {
 134 }
 135
 136 /************************************************************************
 137  *                      POST-AUTHENTICATION SERVICE MSGS                *
 138  ************************************************************************
 139  *
 140  * Callback via dmsg_iocom_core().
 141  */
 142 static
 143 void
 144 master_link_signal(dmsg_iocom_t *iocom)
 145 {
 146         dmsg_msg_lnk_signal(iocom);
 147 }
 148
 149 static
 150 void
 151 master_link_rxmsg(dmsg_msg_t *msg)
 152 {
 153         dmsg_state_t *state;
 154         dmsg_iocom_t *iocom;
 155         uint32_t cmd;
 156
 157         /*
 158          * If the message state has a function established we just
 159          * call the function, otherwise we call the appropriate
 160          * link-level protocol related to the original command and
 161          * let it sort it out.
 162          *
 163          * Non-transactional one-off messages, on the otherhand,
 164          * might have REPLY set.
 165          */
 166         state = msg->state;
 167         iocom = state->iocom;
 168         cmd = (state != &iocom->state0) ? state->icmd : msg->any.head.cmd;
 169
 170         if (state->func) {
 171                 /*
 172                  * Call function or router
 173                  */
 174                 assert(state != &iocom->state0);
 175                 state->func(msg);
 176         } else {
 177                 /*
 178                  * Top-level message
 179                  */
 180                 switch(cmd & DMSGF_PROTOS) {
 181                 case DMSG_PROTO_LNK:
 182                         dmsg_msg_lnk(msg);
 183                         break;
 184                 case DMSG_PROTO_DBG:
 185                         dmsg_msg_dbg(msg);
 186                         break;
 187                 default:
 188                         iocom->usrmsg_callback(msg, 1);
 189                         break;
 190                 }
 191         }
 192 }
 193
 194 /*
 195  * This is called from the master node to process a received debug
 196  * shell command.  We process the command, outputting the results,
 197  * then finish up by outputting another prompt.
 198  */
 199 void
 200 dmsg_msg_dbg(dmsg_msg_t *msg)
 201 {
 202         dmsg_iocom_t *iocom = msg->state->iocom;
 203
 204         switch(msg->tcmd & DMSGF_CMDSWMASK) {
 205         case DMSG_DBG_SHELL:
 206                 /*
 207                  * This is a command which we must process.
 208                  * When we are finished we generate a final reply.
 209                  */
 210                 if (msg->aux_data)
 211                         msg->aux_data[msg->aux_size - 1] = 0;
 212                 iocom->usrmsg_callback(msg, 0);
 213                 break;
 214         case DMSG_DBG_SHELL | DMSGF_REPLY:
 215                 /*
 216                  * A reply just prints out the string.  No newline is added
 217                  * (it is expected to be embedded if desired).
 218                  */
 219                 if (msg->aux_data)
 220                         msg->aux_data[msg->aux_size - 1] = 0;
 221                 if (msg->aux_data)
 222                         write(2, msg->aux_data, strlen(msg->aux_data));
 223                 break;
 224         default:
 225                 iocom->usrmsg_callback(msg, 1);
 226                 break;
 227         }
 228 }
 229
 230 /*
 231  * Returns text debug output to the original defined by (msg).  (msg) is
 232  * not modified and stays intact.  We use a one-way message with REPLY set
 233  * to distinguish between a debug command and debug terminal output.
 234  *
 235  * To prevent loops dmsg_printf() can filter the message (cmd) related
 236  * to the dmsg_printf().  We filter out DBG messages.
 237  */
 238 void
 239 dmsg_printf(dmsg_iocom_t *iocom, const char *ctl, ...)
 240 {
 241         dmsg_msg_t *rmsg;
 242         va_list va;
 243         char buf[1024];
 244         size_t len;
 245
 246         va_start(va, ctl);
 247         vsnprintf(buf, sizeof(buf), ctl, va);
 248         va_end(va);
 249         len = strlen(buf) + 1;
 250
 251         rmsg = dmsg_msg_alloc(&iocom->state0, len,
 252                               DMSG_DBG_SHELL | DMSGF_REPLY,
 253                               NULL, NULL);
 254         bcopy(buf, rmsg->aux_data, len);
 255
 256         dmsg_msg_write(rmsg);
 257 }