etc/rc.d/netwait

   1 #!/bin/sh
   2
   3 # $FreeBSD$
   4 #
   5 # PROVIDE: netwait
   6 # REQUIRE: devd ipfilter ipfw pf routing
   7 # KEYWORD: nojail
   8 #
   9 # The netwait script helps handle two situations:
  10 #  - Systems with USB or other late-attaching network hardware which
  11 #    is initialized by devd events.  The script waits for all the
  12 #    interfaces named in the netwait_if list to appear.
  13 #  - Systems with statically-configured IP addresses in rc.conf(5).
  14 #    The IP addresses in the netwait_ip list are pinged.  The script
  15 #    waits for any single IP in the list to respond to the ping.  If your
  16 #    system uses DHCP, you should probably use synchronous_dhclient="YES"
  17 #    in your /etc/rc.conf instead of netwait_ip.
  18 # Either or both of the wait lists can be used (at least one must be
  19 # non-empty if netwait is enabled).
  20
  21 . /etc/rc.subr
  22
  23 name="netwait"
  24 rcvar="netwait_enable"
  25
  26 start_cmd="${name}_start"
  27 stop_cmd=":"
  28
  29 netwait_start()
  30 {
  31         local ip rc count output link wait_if got_if any_error
  32
  33         if [ -z "${netwait_if}" ] && [ -z "${netwait_ip}" ]; then
  34                 err 1 "No interface or IP addresses listed, nothing to wait for"
  35         fi
  36
  37         if [ ${netwait_timeout} -lt 1 ]; then
  38                 err 1 "netwait_timeout must be >= 1"
  39         fi
  40
  41         if [ -n "${netwait_if}" ]; then
  42                 any_error=0
  43                 for wait_if in ${netwait_if}; do
  44                         echo -n "Waiting for ${wait_if}"
  45                         link=""
  46                         got_if=0
  47                         count=1
  48                         # Handle SIGINT (Ctrl-C); force abort of while() loop
  49                         trap break SIGINT
  50                         while [ ${count} -le ${netwait_if_timeout} ]; do
  51                                 if output=`/sbin/ifconfig ${wait_if} 2>/dev/null`; then
  52                                         if [ ${got_if} -eq 0 ]; then
  53                                                 echo -n ", interface present"
  54                                                 got_if=1
  55                                         fi
  56                                         link=`expr "${output}" : '.*[[:blank:]]status: \(no carrier\)'`
  57                                         if [ -z "${link}" ]; then
  58                                                 echo ', got link.'
  59                                                 break
  60                                         fi
  61                                 fi
  62                                 sleep 1
  63                                 count=$((count+1))
  64                         done
  65                         # Restore default SIGINT handler
  66                         trap - SIGINT
  67                         if [ ${got_if} -eq 0 ]; then
  68                                 echo ", wait failed: interface never appeared."
  69                                 any_error=1
  70                         elif [ -n "${link}" ]; then
  71                                 echo ", wait failed: interface still has no link."
  72                                 any_error=1
  73                         fi
  74                 done
  75                 if [ ${any_error} -eq 1 ]; then
  76                     warn "Continuing with startup, but be aware you may not have "
  77                     warn "a fully functional networking layer at this point."
  78                 fi
  79         fi
  80
  81         if [ -n "${netwait_ip}" ]; then
  82                 # Handle SIGINT (Ctrl-C); force abort of for() loop
  83                 trap break SIGINT
  84
  85                 for ip in ${netwait_ip}; do
  86                         echo -n "Waiting for ${ip} to respond to ICMP ping"
  87
  88                         count=1
  89                         while [ ${count} -le ${netwait_timeout} ]; do
  90                                 /sbin/ping -t 1 -c 1 -o ${ip} >/dev/null 2>&1
  91                                 rc=$?
  92
  93                                 if [ $rc -eq 0 ]; then
  94                                         # Restore default SIGINT handler
  95                                         trap - SIGINT
  96
  97                                         echo ', got response.'
  98                                         return
  99                                 fi
 100                                 count=$((count+1))
 101                         done
 102                         echo ', failed: No response from host.'
 103                 done
 104
 105                 # Restore default SIGINT handler
 106                 trap - SIGINT
 107
 108                 warn "Exhausted IP list.  Continuing with startup, but be aware you may"
 109                 warn "not have a fully functional networking layer at this point."
 110         fi
 111
 112 }
 113
 114 load_rc_config $name
 115 run_rc_command "$1"