DRILL=$(command -v drill)
HOSTIP=$(command -v hostip)
NSLOOKUP=$(command -v nslookup)
+RESOLVEIP=$(command -v resolveip)
# Transfer Programs
WGET=$(command -v wget)
fi
}
-# verify given host and port is connectable
-# $1 Host/IP to verify
-# $2 Port to verify
+# Verify host and port connectivity
+# $1: Host/IP
+# $2: Port
verify_host_port() {
- local __HOST=$1
- local __PORT=$2
- local __NC=$(command -v nc)
- local __NCEXT=$($(command -v nc) --help 2>&1 | grep "\-w" 2>/dev/null) # busybox nc compiled with extensions
- local __IP __IPV4 __IPV6 __RUNPROG __PROG __ERR
# return codes
# 1 system specific error
# 2 nslookup/host error
# 3 nc (netcat) error
# 4 unmatched IP version
+ local host port ipv4 ipv6 nc_cmd err_code
+ host=$1
+ port=$2
+ nc_cmd=$(command -v nc)
+ err_code=0
+
+ # Validate input parameters
+ [ $# -ne 2 ] && { write_log 12 "Error: verify_host_port() requires exactly 2 arguments"; return 1; }
+
+ # Resolve IP address
+ ipv4=$("$RESOLVEIP" -4 "$host")
+ ipv6=$("$RESOLVEIP" -6 "$host")
+ if [ -z "$ipv4" ] && [ -z "$ipv6" ]; then
+ write_log 3 "Failed to resolve any IPv4/6 for host: $host"
+ return 2
+ fi
- [ $# -ne 2 ] && write_log 12 "Error calling 'verify_host_port()' - wrong number of parameters"
-
- # check if ip or FQDN was given
- __IPV4=$(echo $__HOST | grep -m 1 -o "$IPV4_REGEX$") # do not detect ip in 0.0.0.0.example.com
- __IPV6=$(echo $__HOST | grep -m 1 -o "$IPV6_REGEX")
- # if FQDN given get IP address
- [ -z "$__IPV4" -a -z "$__IPV6" ] && {
- if [ -n "$BIND_HOST" ]; then # use BIND host if installed
- __PROG="BIND host"
- __RUNPROG="$BIND_HOST $__HOST >$DATFILE 2>$ERRFILE"
- elif [ -n "$KNOT_HOST" ]; then # use Knot host if installed
- __PROG="Knot host"
- __RUNPROG="$KNOT_HOST $__HOST >$DATFILE 2>$ERRFILE"
- elif [ -n "$DRILL" ]; then # use drill if installed
- __PROG="drill"
- __RUNPROG="$DRILL -V0 $__HOST A >$DATFILE 2>$ERRFILE" # IPv4
- __RUNPROG="$__RUNPROG; $DRILL -V0 $__HOST AAAA >>$DATFILE 2>>$ERRFILE" # IPv6
- elif [ -n "$HOSTIP" ]; then # use hostip if installed
- __PROG="hostip"
- __RUNPROG="$HOSTIP $__HOST >$DATFILE 2>$ERRFILE" # IPv4
- __RUNPROG="$__RUNPROG; $HOSTIP -6 $__HOST >>$DATFILE 2>>$ERRFILE" # IPv6
- else # use BusyBox nslookup
- __PROG="BusyBox nslookup"
- __RUNPROG="$NSLOOKUP $__HOST >$DATFILE 2>$ERRFILE"
- fi
- write_log 7 "#> $__RUNPROG"
- eval $__RUNPROG
- __ERR=$?
- # command error
- [ $__ERR -gt 0 ] && {
- write_log 3 "DNS Resolver Error - $__PROG Error '$__ERR'"
- write_log 7 "$(cat $ERRFILE)"
- return 2
+ # check for forced IP version inconsistency
+ if [ "$force_ipversion" != 0 ]; then
+ [ "$use_ipv6" = 0 ] && [ -z "$ipv4" ] && err_code=4
+ [ "$use_ipv6" = 1 ] && [ -z "$ipv6" ] && err_code=6
+ [ $err_code -gt 0 ] && {
+ [ -n "$LUCI_HELPER" ] && write_log 14 "Error: verify_host_port(): no usable IP for the IP family that was forced"
+ return 4
}
- # extract IP address
- if [ -n "$BIND_HOST" ]; then # use BIND host if installed
- __IPV4="$(awk -F "address " '/has address/ {print $2; exit}' "$DATFILE")"
- __IPV6="$(awk -F "address " '/has IPv6/ {print $2; exit}' "$DATFILE")"
- elif [ -n "$KNOT_HOST" ]; then # use Knot host if installed
- __IPV4="$(awk -F "address " '/has IPv4/ {print $2; exit}' "$DATFILE")"
- __IPV6="$(awk -F "address " '/has IPv6/ {print $2; exit}' "$DATFILE")"
- elif [ -n "$DRILL" ]; then # use drill if installed
- __IPV4="$(awk '/^'"$__HOST"'/ {print $5}' "$DATFILE" | grep -m 1 -o "$IPV4_REGEX")"
- __IPV6="$(awk '/^'"$__HOST"'/ {print $5}' "$DATFILE" | grep -m 1 -o "$IPV6_REGEX")"
- elif [ -n "$HOSTIP" ]; then # use hostip if installed
- __IPV4="$(grep -m 1 -o "$IPV4_REGEX" "$DATFILE")"
- __IPV6="$(grep -m 1 -o "$IPV6_REGEX" "$DATFILE")"
- else # use BusyBox nslookup
- __IPV4="$(sed -ne "/^Name:/,\$ { s/^Address[0-9 ]\{0,\}: \($IPV4_REGEX\).*$/\\1/p }" "$DATFILE")"
- __IPV6="$(sed -ne "/^Name:/,\$ { s/^Address[0-9 ]\{0,\}: \($IPV6_REGEX\).*$/\\1/p }" "$DATFILE")"
+ fi
+
+ # Check connectivity using nc
+ if [ -n "$nc_cmd" ]; then
+ write_log 7 "#> $RESOLVEIP"
+ if [ -n "$ipv4" ]; then
+ timeout 3 "$nc_cmd" "$ipv4" "$port" >/dev/null 2>&1
+ else
+ timeout 3 "$nc_cmd" "$ipv6" "$port" >/dev/null 2>&1
fi
- }
+ err_code=$?
+ if [ $err_code -eq 0 ]; then
- # check IP version if forced
- if [ $force_ipversion -ne 0 ]; then
- __ERR=0
- [ $use_ipv6 -eq 0 -a -z "$__IPV4" ] && __ERR=4
- [ $use_ipv6 -eq 1 -a -z "$__IPV6" ] && __ERR=6
- [ $__ERR -gt 0 ] && {
- [ -n "$LUCI_HELPER" ] && return 4
- write_log 14 "Verify host Error '4' - Forced IP Version IPv$__ERR don't match"
- }
- fi
+ write_log 7 "Successfully connected to $host:$port"
+ return 0
- # verify nc command
- # busybox nc compiled without -l option "NO OPT l!" -> critical error
- $__NC --help 2>&1 | grep -i "NO OPT l!" >/dev/null 2>&1 && \
- write_log 12 "Busybox nc (netcat) compiled without '-l' option, error 'NO OPT l!'"
- # busybox nc compiled with extensions
- $__NC --help 2>&1 | grep "\-w" >/dev/null 2>&1 && __NCEXT="TRUE"
-
- # connectivity test
- # run busybox nc to HOST PORT
- # busybox might be compiled with "FEATURE_PREFER_IPV4_ADDRESS=n"
- # then nc will try to connect via IPv6 if there is any IPv6 available on any host interface
- # not worrying, if there is an IPv6 wan address
- # so if not "force_ipversion" to use_ipv6 then connect test via ipv4, if available
- [ $force_ipversion -ne 0 -a $use_ipv6 -ne 0 -o -z "$__IPV4" ] && __IP=$__IPV6 || __IP=$__IPV4
-
- if [ -n "$__NCEXT" ]; then # BusyBox nc compiled with extensions (timeout support)
- __RUNPROG="$__NC -w 1 $__IP $__PORT </dev/null >$DATFILE 2>$ERRFILE"
- write_log 7 "#> $__RUNPROG"
- eval $__RUNPROG
- __ERR=$?
- [ $__ERR -eq 0 ] && return 0
- write_log 3 "Connect error - BusyBox nc (netcat) Error '$__ERR'"
- write_log 7 "$(cat $ERRFILE)"
- return 3
- else # nc compiled without extensions (no timeout support)
- __RUNPROG="timeout 2 -- $__NC $__IP $__PORT </dev/null >$DATFILE 2>$ERRFILE"
- write_log 7 "#> $__RUNPROG"
- eval $__RUNPROG
- __ERR=$?
- [ $__ERR -eq 0 ] && return 0
- write_log 3 "Connect error - BusyBox nc (netcat) timeout Error '$__ERR'"
- return 3
+ else
+
+ write_log 3 "DNS Resolver Error - $RESOLVEIP (Error: $err_code)"
+ write_log 7 "$(cat "$ERRFILE")"
+ return 3
+
+ fi
+ else
+ write_log 3 "Netcat (nc) command not found."
+ return 1
fi
}
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