630c9dba7a
USB NICs. USB network hardware may not be enumerated and available when the rc.d networking scripts run. Eventually the USB attachment completes and devd events cause the network initialization to happen, but by then other rc.d scripts have already failed, because services which depend on NETWORKING (such as mountcritremote) may end up running before the network is actually ready. There is an existing netwait script, but because it is dependent on NETWORKING it runs too late to prevent failure of some other rc scripts. This change flips the order so that NETWORKING depends on netwait, and netwait now depends on devd and routing (the former is needed to make interfaces appear, and the latter is needed to run the ping tests in netwait). The netwait script used to be oriented primarily towards "as soon as any host is reachable the network is fully functional", so you gave it a list of IPs to try and you could optionally name an interface and it would wait for carrier on that interface. That functionality still works the same, but now you can provide a list of interfaces to wait for and it waits until each one of them is available. The ping logic still completes as soon as the first IP on the list responds. These changes were submitted by Brenden Molloy <brendan+freebsd@bbqsrc.net> in PR 205186, and lightly modified by me to allow a list of interfaces instead of just one. PR: 205186 Differential Revision: https://reviews.freebsd.org/D4608 (timeout w/o review)
116 lines
2.9 KiB
Bash
Executable File
116 lines
2.9 KiB
Bash
Executable File
#!/bin/sh
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# $FreeBSD$
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#
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# PROVIDE: netwait
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# REQUIRE: devd routing
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# KEYWORD: nojail
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#
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# The netwait script helps handle two situations:
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# - Systems with USB or other late-attaching network hardware which
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# is initialized by devd events. The script waits for all the
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# interfaces named in the netwait_if list to appear.
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# - Systems with statically-configured IP addresses in rc.conf(5).
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# The IP addresses in the netwait_ip list are pinged. The script
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# waits for any single IP in the list to respond to the ping. If your
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# system uses DHCP, you should probably use synchronous_dhclient="YES"
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# in your /etc/rc.conf instead of netwait_ip.
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# Either or both of the wait lists can be used (at least one must be
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# non-empty if netwait is enabled).
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. /etc/rc.subr
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name="netwait"
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rcvar="netwait_enable"
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start_cmd="${name}_start"
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stop_cmd=":"
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netwait_start()
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{
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local ip rc count output link wait_if got_if any_error
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if [ -z "${netwait_if}" ] && [ -z "${netwait_ip}" ]; then
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err 1 "No interface or IP addresses listed, nothing to wait for"
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fi
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if [ ${netwait_timeout} -lt 1 ]; then
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err 1 "netwait_timeout must be >= 1"
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fi
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if [ -n "${netwait_if}" ]; then
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any_error=0
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for wait_if in ${netwait_if}; do
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echo -n "Waiting for ${wait_if}"
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link=""
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got_if=0
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count=1
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# Handle SIGINT (Ctrl-C); force abort of while() loop
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trap break SIGINT
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while [ ${count} -le ${netwait_if_timeout} ]; do
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if output=`/sbin/ifconfig ${wait_if} 2>/dev/null`; then
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if [ ${got_if} -eq 0 ]; then
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echo -n ", interface present"
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got_if=1
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fi
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link=`expr "${output}" : '.*[[:blank:]]status: \(no carrier\)'`
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if [ -z "${link}" ]; then
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echo ', got link.'
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break
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fi
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fi
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sleep 1
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count=$((count+1))
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done
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# Restore default SIGINT handler
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trap - SIGINT
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if [ ${got_if} -eq 0 ]; then
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echo ", wait failed: interface never appeared."
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any_error=1
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elif [ -n "${link}" ]; then
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echo ", wait failed: interface still has no link."
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any_error=1
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fi
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done
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if [ ${any_error} -eq 1 ]; then
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warn "Continuing with startup, but be aware you may not have "
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warn "a fully functional networking layer at this point."
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fi
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fi
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if [ -n "${netwait_ip}" ]; then
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# Handle SIGINT (Ctrl-C); force abort of for() loop
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trap break SIGINT
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for ip in ${netwait_ip}; do
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echo -n "Waiting for ${ip} to respond to ICMP ping"
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count=1
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while [ ${count} -le ${netwait_timeout} ]; do
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/sbin/ping -t 1 -c 1 -o ${ip} >/dev/null 2>&1
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rc=$?
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if [ $rc -eq 0 ]; then
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# Restore default SIGINT handler
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trap - SIGINT
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echo ', got response.'
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return
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fi
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count=$((count+1))
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done
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echo ', failed: No response from host.'
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done
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# Restore default SIGINT handler
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trap - SIGINT
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warn "Exhausted IP list. Continuing with startup, but be aware you may"
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warn "not have a fully functional networking layer at this point."
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fi
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}
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load_rc_config $name
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run_rc_command "$1"
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