usr.sbin/rtadvd/control_client.c

   1 /*-
   2  * Copyright (C) 2011 Hiroki Sato <hrs@FreeBSD.org>
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  17  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS
  18  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  19  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  20  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  21  * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
  22  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
  23  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
  24  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  25  *
  26  * $FreeBSD: stable/10/usr.sbin/rtadvd/control_client.c 225519 2011-09-12 23:52:55Z hrs $
  27  *
  28  */
  29
  30 #include <sys/queue.h>
  31 #include <sys/types.h>
  32 #include <sys/socket.h>
  33 #include <sys/stat.h>
  34 #include <sys/un.h>
  35 #include <sys/uio.h>
  36 #include <net/if.h>
  37 #include <net/if_dl.h>
  38 #include <netinet/in.h>
  39 #include <netinet/icmp6.h>
  40 #include <fcntl.h>
  41 #include <errno.h>
  42 #include <netdb.h>
  43 #include <unistd.h>
  44 #include <signal.h>
  45 #include <string.h>
  46 #include <stdarg.h>
  47 #include <stdio.h>
  48 #include <stdlib.h>
  49 #include <syslog.h>
  50
  51 #include "pathnames.h"
  52 #include "rtadvd.h"
  53 #include "if.h"
  54 #include "control.h"
  55 #include "control_client.h"
  56
  57 int
  58 cm_handler_client(int fd, int state, char *buf_orig)
  59 {
  60         char buf[CM_MSG_MAXLEN];
  61         struct ctrl_msg_hdr *cm;
  62         struct ctrl_msg_hdr *cm_orig;
  63         int error;
  64         char *msg;
  65         char *msg_orig;
  66
  67         syslog(LOG_DEBUG, "<%s> enter", __func__);
  68
  69         memset(buf, 0, sizeof(buf));
  70         cm = (struct ctrl_msg_hdr *)buf;
  71         cm_orig = (struct ctrl_msg_hdr *)buf_orig;
  72         msg = (char *)buf + sizeof(*cm);
  73         msg_orig = (char *)buf_orig + sizeof(*cm_orig);
  74
  75         if (cm_orig->cm_len > CM_MSG_MAXLEN) {
  76                 syslog(LOG_DEBUG, "<%s> msg too long", __func__);
  77                 close(fd);
  78                 return (-1);
  79         }
  80         cm->cm_type = cm_orig->cm_type;
  81         if (cm_orig->cm_len > sizeof(*cm_orig)) {
  82                 memcpy(msg, msg_orig, cm_orig->cm_len - sizeof(*cm));
  83                 cm->cm_len = cm_orig->cm_len;
  84         }
  85         while (state != CM_STATE_EOM) {
  86                 syslog(LOG_DEBUG, "<%s> state = %d", __func__, state);
  87
  88                 switch (state) {
  89                 case CM_STATE_INIT:
  90                         state = CM_STATE_EOM;
  91                         break;
  92                 case CM_STATE_MSG_DISPATCH:
  93                         cm->cm_version = CM_VERSION;
  94                         error = cm_send(fd, buf);
  95                         if (error)
  96                                 syslog(LOG_WARNING,
  97                                     "<%s> cm_send()", __func__);
  98                         state = CM_STATE_ACK_WAIT;
  99                         break;
 100                 case CM_STATE_ACK_WAIT:
 101                         error = cm_recv(fd, buf);
 102                         if (error) {
 103                                 syslog(LOG_ERR,
 104                                     "<%s> cm_recv()", __func__);
 105                                 close(fd);
 106                                 return (-1);
 107                         }
 108                         switch (cm->cm_type) {
 109                         case CM_TYPE_ACK:
 110                                 syslog(LOG_DEBUG,
 111                                     "<%s> CM_TYPE_ACK", __func__);
 112                                 break;
 113                         case CM_TYPE_ERR:
 114                                 syslog(LOG_DEBUG,
 115                                     "<%s> CM_TYPE_ERR", __func__);
 116                                 close(fd);
 117                                 return (-1);
 118                         default:
 119                                 syslog(LOG_DEBUG,
 120                                     "<%s> unknown status", __func__);
 121                                 close(fd);
 122                                 return (-1);
 123                         }
 124                         memcpy(buf_orig, buf, cm->cm_len);
 125                         state = CM_STATE_EOM;
 126                         break;
 127                 }
 128         }
 129         close(fd);
 130         return (0);
 131 }