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Improve network interfaces

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- Use eth0 instead of eth+ throughout for consistency
- Improve error messages when eth0 is unavailable
This commit is contained in:
hwdsl2 2017-04-30 17:16:33 -05:00
parent cebf9f4361
commit cf75c2bb86
2 changed files with 42 additions and 40 deletions
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41
vpnsetup.sh
View File

@ -67,19 +67,20 @@ if [ "$(id -u)" != 0 ]; then
exiterr "Script must be run as root. Try 'sudo sh $0'"
fi
NET_IF0=${VPN_IFACE:-'eth0'}
NET_IFS=${VPN_IFACE:-'eth+'}
if_state=$(cat "/sys/class/net/$NET_IF0/operstate" 2>/dev/null)
if [ -z "$if_state" ] || [ "$if_state" = "down" ] || [ "$NET_IF0" = "lo" ]; then
printf "Error: Network interface '%s' is not available.\n" "$NET_IF0" >&2
printf '\n%s\n' "DO NOT RUN THIS SCRIPT ON YOUR PC OR MAC!" >&2
printf '\n%s\n\n' "If running on a server, try this workaround:" >&2
NET_IFACE=${VPN_NET_IFACE:-'eth0'}
if_state=$(cat "/sys/class/net/$NET_IFACE/operstate" 2>/dev/null)
if [ -z "$if_state" ] || [ "$if_state" = "down" ] || [ "$NET_IFACE" = "lo" ]; then
printf "Error: Network interface '%s' is not available.\n\n" "$NET_IFACE" >&2
cat 1>&2 <<'EOF'
VPN_IFACE="$(route | grep '^default' | grep -o '[^ ]*$')"
DO NOT RUN THIS SCRIPT ON YOUR PC OR MAC!
If running on a server, please re-run the script using
the following commands:
VPN_NET_IFACE="$(route | grep '^default' | grep -o '[^ ]*$')"
EOF
cat 1>&2 <<EOF
sudo VPN_IFACE="\$VPN_IFACE" sh "$0"
sudo VPN_NET_IFACE="\$VPN_NET_IFACE" sh "$0"
EOF
exit 1
fi
@ -331,11 +332,11 @@ net.ipv4.conf.default.accept_redirects = 0
net.ipv4.conf.all.send_redirects = 0
net.ipv4.conf.default.send_redirects = 0
net.ipv4.conf.lo.send_redirects = 0
net.ipv4.conf.$NET_IF0.send_redirects = 0
net.ipv4.conf.$NET_IFACE.send_redirects = 0
net.ipv4.conf.all.rp_filter = 0
net.ipv4.conf.default.rp_filter = 0
net.ipv4.conf.lo.rp_filter = 0
net.ipv4.conf.$NET_IF0.rp_filter = 0
net.ipv4.conf.$NET_IFACE.rp_filter = 0
net.ipv4.icmp_echo_ignore_broadcasts = 1
net.ipv4.icmp_ignore_bogus_error_responses = 1
@ -352,8 +353,8 @@ bigecho "Updating IPTables rules..."
ipt_flag=0
IPT_FILE="/etc/iptables.rules"
if ! grep -qs "hwdsl2 VPN script" "$IPT_FILE" \
|| ! iptables -t nat -C POSTROUTING -s "$L2TP_NET" -o "$NET_IFS" -j MASQUERADE 2>/dev/null \
|| ! iptables -t nat -C POSTROUTING -s "$XAUTH_NET" -o "$NET_IFS" -m policy --dir out --pol none -j MASQUERADE 2>/dev/null; then
|| ! iptables -t nat -C POSTROUTING -s "$L2TP_NET" -o "$NET_IFACE" -j MASQUERADE 2>/dev/null \
|| ! iptables -t nat -C POSTROUTING -s "$XAUTH_NET" -o "$NET_IFACE" -m policy --dir out --pol none -j MASQUERADE 2>/dev/null; then
ipt_flag=1
fi
@ -368,17 +369,17 @@ if [ "$ipt_flag" = "1" ]; then
iptables -I INPUT 5 -p udp --dport 1701 -m policy --dir in --pol ipsec -j ACCEPT
iptables -I INPUT 6 -p udp --dport 1701 -j DROP
iptables -I FORWARD 1 -m conntrack --ctstate INVALID -j DROP
iptables -I FORWARD 2 -i "$NET_IFS" -o ppp+ -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
iptables -I FORWARD 3 -i ppp+ -o "$NET_IFS" -j ACCEPT
iptables -I FORWARD 2 -i "$NET_IFACE" -o ppp+ -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
iptables -I FORWARD 3 -i ppp+ -o "$NET_IFACE" -j ACCEPT
iptables -I FORWARD 4 -i ppp+ -o ppp+ -s "$L2TP_NET" -d "$L2TP_NET" -j ACCEPT
iptables -I FORWARD 5 -i "$NET_IFS" -d "$XAUTH_NET" -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
iptables -I FORWARD 6 -s "$XAUTH_NET" -o "$NET_IFS" -j ACCEPT
iptables -I FORWARD 5 -i "$NET_IFACE" -d "$XAUTH_NET" -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
iptables -I FORWARD 6 -s "$XAUTH_NET" -o "$NET_IFACE" -j ACCEPT
# Uncomment if you wish to disallow traffic between VPN clients themselves
# iptables -I FORWARD 2 -i ppp+ -o ppp+ -s "$L2TP_NET" -d "$L2TP_NET" -j DROP
# iptables -I FORWARD 3 -s "$XAUTH_NET" -d "$XAUTH_NET" -j DROP
iptables -A FORWARD -j DROP
iptables -t nat -I POSTROUTING -s "$XAUTH_NET" -o "$NET_IFS" -m policy --dir out --pol none -j MASQUERADE
iptables -t nat -I POSTROUTING -s "$L2TP_NET" -o "$NET_IFS" -j MASQUERADE
iptables -t nat -I POSTROUTING -s "$XAUTH_NET" -o "$NET_IFACE" -m policy --dir out --pol none -j MASQUERADE
iptables -t nat -I POSTROUTING -s "$L2TP_NET" -o "$NET_IFACE" -j MASQUERADE
echo "# Modified by hwdsl2 VPN script" > "$IPT_FILE"
iptables-save >> "$IPT_FILE"

41
vpnsetup_centos.sh
View File

@ -60,19 +60,20 @@ if [ "$(id -u)" != 0 ]; then
exiterr "Script must be run as root. Try 'sudo sh $0'"
fi
NET_IF0=${VPN_IFACE:-'eth0'}
NET_IFS=${VPN_IFACE:-'eth+'}
if_state=$(cat "/sys/class/net/$NET_IF0/operstate" 2>/dev/null)
if [ -z "$if_state" ] || [ "$if_state" = "down" ] || [ "$NET_IF0" = "lo" ]; then
printf "Error: Network interface '%s' is not available.\n" "$NET_IF0" >&2
printf '\n%s\n' "DO NOT RUN THIS SCRIPT ON YOUR PC OR MAC!" >&2
printf '\n%s\n\n' "If running on a server, try this workaround:" >&2
NET_IFACE=${VPN_NET_IFACE:-'eth0'}
if_state=$(cat "/sys/class/net/$NET_IFACE/operstate" 2>/dev/null)
if [ -z "$if_state" ] || [ "$if_state" = "down" ] || [ "$NET_IFACE" = "lo" ]; then
printf "Error: Network interface '%s' is not available.\n\n" "$NET_IFACE" >&2
cat 1>&2 <<'EOF'
VPN_IFACE="$(route | grep '^default' | grep -o '[^ ]*$')"
DO NOT RUN THIS SCRIPT ON YOUR PC OR MAC!
If running on a server, please re-run the script using
the following commands:
VPN_NET_IFACE="$(route | grep '^default' | grep -o '[^ ]*$')"
EOF
cat 1>&2 <<EOF
sudo VPN_IFACE="\$VPN_IFACE" sh "$0"
sudo VPN_NET_IFACE="\$VPN_NET_IFACE" sh "$0"
EOF
exit 1
fi
@ -315,11 +316,11 @@ net.ipv4.conf.default.accept_redirects = 0
net.ipv4.conf.all.send_redirects = 0
net.ipv4.conf.default.send_redirects = 0
net.ipv4.conf.lo.send_redirects = 0
net.ipv4.conf.$NET_IF0.send_redirects = 0
net.ipv4.conf.$NET_IFACE.send_redirects = 0
net.ipv4.conf.all.rp_filter = 0
net.ipv4.conf.default.rp_filter = 0
net.ipv4.conf.lo.rp_filter = 0
net.ipv4.conf.$NET_IF0.rp_filter = 0
net.ipv4.conf.$NET_IFACE.rp_filter = 0
net.ipv4.icmp_echo_ignore_broadcasts = 1
net.ipv4.icmp_ignore_bogus_error_responses = 1
@ -336,8 +337,8 @@ bigecho "Updating IPTables rules..."
ipt_flag=0
IPT_FILE="/etc/sysconfig/iptables"
if ! grep -qs "hwdsl2 VPN script" "$IPT_FILE" \
|| ! iptables -t nat -C POSTROUTING -s "$L2TP_NET" -o "$NET_IFS" -j MASQUERADE 2>/dev/null \
|| ! iptables -t nat -C POSTROUTING -s "$XAUTH_NET" -o "$NET_IFS" -m policy --dir out --pol none -j MASQUERADE 2>/dev/null; then
|| ! iptables -t nat -C POSTROUTING -s "$L2TP_NET" -o "$NET_IFACE" -j MASQUERADE 2>/dev/null \
|| ! iptables -t nat -C POSTROUTING -s "$XAUTH_NET" -o "$NET_IFACE" -m policy --dir out --pol none -j MASQUERADE 2>/dev/null; then
ipt_flag=1
fi
@ -352,17 +353,17 @@ if [ "$ipt_flag" = "1" ]; then
iptables -I INPUT 5 -p udp --dport 1701 -m policy --dir in --pol ipsec -j ACCEPT
iptables -I INPUT 6 -p udp --dport 1701 -j DROP
iptables -I FORWARD 1 -m conntrack --ctstate INVALID -j DROP
iptables -I FORWARD 2 -i "$NET_IFS" -o ppp+ -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
iptables -I FORWARD 3 -i ppp+ -o "$NET_IFS" -j ACCEPT
iptables -I FORWARD 2 -i "$NET_IFACE" -o ppp+ -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
iptables -I FORWARD 3 -i ppp+ -o "$NET_IFACE" -j ACCEPT
iptables -I FORWARD 4 -i ppp+ -o ppp+ -s "$L2TP_NET" -d "$L2TP_NET" -j ACCEPT
iptables -I FORWARD 5 -i "$NET_IFS" -d "$XAUTH_NET" -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
iptables -I FORWARD 6 -s "$XAUTH_NET" -o "$NET_IFS" -j ACCEPT
iptables -I FORWARD 5 -i "$NET_IFACE" -d "$XAUTH_NET" -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
iptables -I FORWARD 6 -s "$XAUTH_NET" -o "$NET_IFACE" -j ACCEPT
# Uncomment if you wish to disallow traffic between VPN clients themselves
# iptables -I FORWARD 2 -i ppp+ -o ppp+ -s "$L2TP_NET" -d "$L2TP_NET" -j DROP
# iptables -I FORWARD 3 -s "$XAUTH_NET" -d "$XAUTH_NET" -j DROP
iptables -A FORWARD -j DROP
iptables -t nat -I POSTROUTING -s "$XAUTH_NET" -o "$NET_IFS" -m policy --dir out --pol none -j MASQUERADE
iptables -t nat -I POSTROUTING -s "$L2TP_NET" -o "$NET_IFS" -j MASQUERADE
iptables -t nat -I POSTROUTING -s "$XAUTH_NET" -o "$NET_IFACE" -m policy --dir out --pol none -j MASQUERADE
iptables -t nat -I POSTROUTING -s "$L2TP_NET" -o "$NET_IFACE" -j MASQUERADE
echo "# Modified by hwdsl2 VPN script" > "$IPT_FILE"
iptables-save >> "$IPT_FILE"
fi