libexec/rc/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 desc="Wait for network devices or the network being up"
  25 rcvar="netwait_enable"
  26
  27 start_cmd="${name}_start"
  28 stop_cmd=":"
  29
  30 netwait_start()
  31 {
  32         local ip rc count output link wait_if got_if any_error
  33
  34         if [ -z "${netwait_if}" ] && [ -z "${netwait_ip}" ]; then
  35                 err 1 "No interface or IP addresses listed, nothing to wait for"
  36         fi
  37
  38         if [ ${netwait_timeout} -lt 1 ]; then
  39                 err 1 "netwait_timeout must be >= 1"
  40         fi
  41
  42         if [ -n "${netwait_if}" ]; then
  43                 any_error=0
  44                 for wait_if in ${netwait_if}; do
  45                         echo -n "Waiting for ${wait_if}"
  46                         link=""
  47                         got_if=0
  48                         count=1
  49                         # Handle SIGINT (Ctrl-C); force abort of while() loop
  50                         trap break SIGINT
  51                         while [ ${count} -le ${netwait_if_timeout} ]; do
  52                                 if output=`/sbin/ifconfig ${wait_if} 2>/dev/null`; then
  53                                         if [ ${got_if} -eq 0 ]; then
  54                                                 echo -n ", interface present"
  55                                                 got_if=1
  56                                         fi
  57                                         link=`expr "${output}" : '.*[[:blank:]]status: \(no carrier\)'`
  58                                         if [ -z "${link}" ]; then
  59                                                 echo ', got link.'
  60                                                 break
  61                                         fi
  62                                 fi
  63                                 sleep 1
  64                                 count=$((count+1))
  65                         done
  66                         # Restore default SIGINT handler
  67                         trap - SIGINT
  68                         if [ ${got_if} -eq 0 ]; then
  69                                 echo ", wait failed: interface never appeared."
  70                                 any_error=1
  71                         elif [ -n "${link}" ]; then
  72                                 echo ", wait failed: interface still has no link."
  73                                 any_error=1
  74                         fi
  75                 done
  76                 if [ ${any_error} -eq 1 ]; then
  77                     warn "Continuing with startup, but be aware you may not have "
  78                     warn "a fully functional networking layer at this point."
  79                 fi
  80         fi
  81
  82         if [ -n "${netwait_ip}" ]; then
  83                 # Handle SIGINT (Ctrl-C); force abort of for() loop
  84                 trap break SIGINT
  85
  86                 for ip in ${netwait_ip}; do
  87                         echo -n "Waiting for ${ip} to respond to ICMP ping"
  88
  89                         count=1
  90                         while [ ${count} -le ${netwait_timeout} ]; do
  91                                 /sbin/ping -t 1 -c 1 -o ${ip} >/dev/null 2>&1
  92                                 rc=$?
  93
  94                                 if [ $rc -eq 0 ]; then
  95                                         # Restore default SIGINT handler
  96                                         trap - SIGINT
  97
  98                                         echo ', got response.'
  99                                         return
 100                                 fi
 101                                 count=$((count+1))
 102                         done
 103                         echo ', failed: No response from host.'
 104                 done
 105
 106                 # Restore default SIGINT handler
 107                 trap - SIGINT
 108
 109                 warn "Exhausted IP list.  Continuing with startup, but be aware you may"
 110                 warn "not have a fully functional networking layer at this point."
 111         fi
 112
 113 }
 114
 115 load_rc_config $name
 116 run_rc_command "$1"