etc/rc.d/netwait

   1 #!/bin/sh
   2
   3 # $FreeBSD$
   4 #
   5 # PROVIDE: netwait
   6 # REQUIRE: NETWORKING
   7 # KEYWORD: nojail
   8 #
   9 # The netwait script is intended to be used by systems which have
  10 # statically-configured IP addresses in rc.conf(5).  If your system
  11 # uses DHCP, you should use synchronous_dhclient="YES" in your
  12 # /etc/rc.conf instead of using netwait.
  13
  14 . /etc/rc.subr
  15
  16 name="netwait"
  17 rcvar="netwait_enable"
  18
  19 start_cmd="${name}_start"
  20 stop_cmd=":"
  21
  22 netwait_start()
  23 {
  24         local ip rc count output link
  25
  26         if [ -z "${netwait_ip}" ]; then
  27                 err 1 "You must define one or more IP addresses in netwait_ip"
  28         fi
  29
  30         if [ ${netwait_timeout} -lt 1 ]; then
  31                 err 1 "netwait_timeout must be >= 1"
  32         fi
  33
  34         # Handle SIGINT (Ctrl-C); force abort of while() loop
  35         trap break SIGINT
  36
  37         if [ -n "${netwait_if}" ]; then
  38                 echo -n "Waiting for $netwait_if to have link"
  39
  40                 count=1
  41                 while [ ${count} -le ${netwait_if_timeout} ]; do
  42                         if output=`/sbin/ifconfig ${netwait_if} 2>/dev/null`; then
  43                                 link=`expr "${output}" : '.*[[:blank:]]status: \(no carrier\)'`
  44                                 if [ -z "${link}" ]; then
  45                                         echo '.'
  46                                         break
  47                                 fi
  48                         else
  49                                 echo ''
  50                                 err 1 "ifconfig ${netwait_if} failed"
  51                         fi
  52                         sleep 1
  53                         count=$((count+1))
  54                 done
  55                 if [ -n "${link}" ]; then
  56                         # Restore default SIGINT handler
  57                         trap - SIGINT
  58
  59                         echo ''
  60                         warn "Interface still has no link.  Continuing with startup, but"
  61                         warn "be aware you may not have a fully functional networking"
  62                         warn "layer at this point."
  63                         return
  64                 fi
  65         fi
  66
  67         # Handle SIGINT (Ctrl-C); force abort of while() loop
  68         trap break SIGINT
  69
  70         for ip in ${netwait_ip}; do
  71                 echo -n "Waiting for ${ip} to respond to ICMP"
  72
  73                 count=1
  74                 while [ ${count} -le ${netwait_timeout} ]; do
  75                         /sbin/ping -t 1 -c 1 -o ${ip} >/dev/null 2>&1
  76                         rc=$?
  77
  78                         if [ $rc -eq 0 ]; then
  79                                 # Restore default SIGINT handler
  80                                 trap - SIGINT
  81
  82                                 echo '.'
  83                                 return
  84                         fi
  85                         count=$((count+1))
  86                 done
  87                 echo ': No response from host.'
  88         done
  89
  90         # Restore default SIGINT handler
  91         trap - SIGINT
  92
  93         warn "Exhausted IP list.  Continuing with startup, but be aware you may"
  94         warn "not have a fully functional networking layer at this point."
  95 }
  96
  97 load_rc_config $name
  98 run_rc_command "$1"