0.6.7

README.md

@@ -92,7 +92,7 @@ sudo lnxrouter -i eth1 -o isp5  --no-dns  --dhcp-dns 1.1.1.1  -6 --dhcp-dns6 [26
 > In this case of usage, it's recommended to:
 > 
 > 1. Stop serving local DNS
-> 2. Tell clients which DNS to use (ISP5's DNS. Or, a safe public DNS, like above example)
+> 2. Tell clients which DNS to use ISP5's DNS. (Or, a safe public DNS, like above example)
 
 > Also, read *Notice 1*
 
@@ -138,7 +138,7 @@ sudo lnxrouter -i lxcbr5
 
 ### Transparent proxy
 
-All clients' Internet traffic go through, for example, Tor
+All clients' Internet traffic go through, for example, Tor (notice this example is NOT an anonymity use)
 
 <details>
 
@@ -155,6 +155,10 @@ TransPort [fd00:5:6:7::1]:9040
 DNSPort [fd00:5:6:7::1]:9053
 ```
 
+> **Warn**: Tor's anonymity relies on a purpose-made browser. Using Tor like this (sharing Tor's network to LAN clients) will NOT ensure anonymity.
+> 
+> Although we use Tor as example here, Linux-router does NOT ensure nor is NOT aiming at anonymity.
+
 </details>
 
 ### Clients-in-sandbox network
@@ -173,7 +177,7 @@ sudo lnxrouter -i eth1 \
 
 </details>
 
-> This script comes with no warrenty. Use on your own risk
+> Linux-router comes with no warranty. Use on your own risk
 
 ### Use as transparent proxy for LXD
 
@@ -284,17 +288,17 @@ Options:
                             queries to other interfaces)
     -n                      Do not provide Internet (See Notice 1)
     --ban-priv              Disallow clients to access my private network
-
+    
     -g <ip>                 This host's IPv4 address in subnet (mask is /24)
                             (example: '192.168.5.1' or '5' shortly)
     -6                      Enable IPv6 (NAT)
     --no4                   Disable IPv4 Internet (not forwarding IPv4)
                             (See Notice 1). Usually used with '-6'
-
+                            
     --p6 <prefix>           Set IPv6 LAN address prefix (length 64) 
                             (example: 'fd00:0:0:5::' or '5' shortly) 
                             Using this enables '-6'
-
+                            
     --dns <ip>|<port>|<ip:port>
                             DNS server's upstream DNS.
                             Use ',' to seperate multiple servers
@@ -317,25 +321,27 @@ Options:
     -d                      DNS server will take into account /etc/hosts
     -e <hosts_file>         DNS server will take into account additional 
                             hosts file
-
+    --dns-nocache           DNS server no cache
+    
     --mac <MAC>             Set MAC address
     --random-mac            Use random MAC address
-
+ 
     --tp <port>             Transparent proxy,
-                            redirect non-LAN TCP and UDP traffic to port.
+                            redirect non-LAN TCP and UDP(not tested) traffic to
-                            (usually used with '--dns')
+                            port. (usually used with '--dns')
-
+    
   WiFi hotspot options:
     --ap <wifi interface> <SSID>
                             Create WiFi access point
     -p, --password <password>   
                             WiFi password
-    --qr                    Show WiFi QR code in terminal
+    --qr                    Show WiFi QR code in terminal (need qrencode)
-
+    
     --hidden                Hide access point (not broadcast SSID)
     --no-virt               Do not create virtual interface
                             Using this you can't use same wlan interface
                             for both Internet and AP
+    --virt-name <name>      Set name of virtual interface
     -c <channel>            Channel number (default: 1)
     --country <code>        Set two-letter country code for regularity
                             (example: US)
@@ -350,12 +356,12 @@ Options:
                             (defaults to /etc/hostapd/hostapd.accept)
     --hostapd-debug <level> 1 or 2. Passes -d or -dd to hostapd
     --isolate-clients       Disable wifi communication between clients
-
+    
     --ieee80211n            Enable IEEE 802.11n (HT)
     --ieee80211ac           Enable IEEE 802.11ac (VHT)
     --ht_capab <HT>         HT capabilities (default: [HT40+])
     --vht_capab <VHT>       VHT capabilities
-
+    
     --no-haveged            Do not run haveged automatically when needed
 
   Instance managing:
@@ -397,6 +403,16 @@ On exit of a linux-router instance, script **will do cleanup**, i.e. undo most c
 5. The wifi device which is used to create hotspot is `rfkill unblock`ed
 6. WiFi country code, if user assigns
 
+## Install
+
+1-file-script. Download and run (meet the dependencies).
+
+I'm currently not packaging for any distro. If you do, open a PR and add the link (can be with a version badge) to list here:
+
+| Linux distro |                                                                                                            |
+| ------------ | ---------------------------------------------------------------------------------------------------------- |
+| Any          | download [1-file-script](https://raw.githubusercontent.com/garywill/linux-router/master/lnxrouter) and run |
+
 ## Dependencies
 
 - bash
@@ -409,7 +425,6 @@ On exit of a linux-router instance, script **will do cleanup**, i.e. undo most c
   - iw
   - iwconfig (you only need this if 'iw' can not recognize your adapter)
   - haveged (optional)
-  - qrencode (optional)
 
 ## TODO
 

lnxrouter

@@ -1,6 +1,6 @@
 #!/bin/bash
 
-VERSION=0.6.6
+VERSION=0.6.7
 PROGNAME="$(basename $0)"
 
 export LC_ALL=C
@@ -67,25 +67,27 @@ Options:
     -d                      DNS server will take into account /etc/hosts
     -e <hosts_file>         DNS server will take into account additional 
                             hosts file
+    --dns-nocache           DNS server no cache
     
     --mac <MAC>             Set MAC address
     --random-mac            Use random MAC address
  
     --tp <port>             Transparent proxy,
-                            redirect non-LAN TCP and UDP traffic to port.
+                            redirect non-LAN TCP and UDP(not tested) traffic to
-                            (usually used with '--dns')
+                            port. (usually used with '--dns')
     
   WiFi hotspot options:
     --ap <wifi interface> <SSID>
                             Create WiFi access point
     -p, --password <password>   
                             WiFi password
-    --qr                    Show WiFi QR code in terminal
+    --qr                    Show WiFi QR code in terminal (need qrencode)
     
     --hidden                Hide access point (not broadcast SSID)
     --no-virt               Do not create virtual interface
                             Using this you can't use same wlan interface
                             for both Internet and AP
+    --virt-name <name>      Set name of virtual interface
     -c <channel>            Channel number (default: 1)
     --country <code>        Set two-letter country code for regularity
                             (example: US)
@@ -156,6 +158,7 @@ define_global_variables(){
     SHOW_DNS_QUERY=0  # log dns
     ETC_HOSTS=0
     ADDN_HOSTS=
+    DNS_NOCACHE=
     CONN_IFACE=    # which interface user choose to use to create network
     INTERNET_IFACE= # which interface to get Internet from
     THISHOSTNAME=   # this host's name the DNS tells clients 
@@ -195,6 +198,7 @@ define_global_variables(){
     
     # script variables
     VWIFI_IFACE=  # virtual wifi interface name, if created
+    VIRT_NAME= # name to use for virtual interface if --virt-name is used
     AP_IFACE=     # can be VWIFI_IFACE or WIFI_IFACE
     USE_IWCONFIG=0  # some device can't use iw
     
@@ -322,6 +326,10 @@ parse_user_options(){
                 ADDN_HOSTS="$1"
                 shift
                 ;;
+            --dns-nocache)
+                shift
+                DNS_NOCACHE=1
+                ;;
             
             --isolate-clients)
                 shift
@@ -399,6 +407,11 @@ parse_user_options(){
                 shift
                 NO_VIRT=1
                 ;;
+            --virt-name)
+                shift
+                VIRT_NAME="$1"
+                shift
+                ;;
 
             --country)
                 shift
@@ -505,6 +518,10 @@ is_interface() {
     [[ -d "/sys/class/net/${1}" ]]
 }
 
+is_vface_name_allocated(){
+    is_interface "$1" || [[ -f "$COMMON_CONFDIR/vfaces/${1}" ]]
+}
+
 get_interface_phy_device() { # only for wifi interface
     local x
     for x in /sys/class/ieee80211/*; do
@@ -651,20 +668,19 @@ get_interface_pci_info() {  # pci id / model / virtual
     # TODO current driver
 }
 
-
 alloc_new_vface_name() { # only for wifi
     local i=0
-    local v_iface_name=
+    local v_iface_name="$VIRT_NAME"
-    while :; do
+    if [[ -z $VIRT_NAME ]]; then
-        v_iface_name="x$i${WIFI_IFACE}"
+        while :; do
-        if ! is_interface ${v_iface_name} && [[ ! -f $COMMON_CONFDIR/vfaces/${v_iface_name} ]]; then
+            v_iface_name="x$i${WIFI_IFACE}"
-            mkdir -p $COMMON_CONFDIR/vfaces
+            i=$((i + 1))
-            touch $COMMON_CONFDIR/vfaces/${v_iface_name}
+            is_vface_name_allocated ${v_iface_name} || break
-            echo "${v_iface_name}"
+        done
-            return
+    fi
-        fi
+    mkdir -p $COMMON_CONFDIR/vfaces
-        i=$((i + 1))
+    touch $COMMON_CONFDIR/vfaces/${v_iface_name}
-    done
+    echo "${v_iface_name}"
 }
 
 dealloc_vface_name() {
@@ -1021,7 +1037,7 @@ allow_dhcp() {
 # TODO: use 'DNAT' instead of '--to-ports' to support other IP
 start_redsocks() {
     echo
-    echo "iptables: transparent proxy non-LAN TCP/UDP traffic to port ${TP_PORT}"
+    echo "iptables: transparent proxy non-LAN TCP and UDP(not tested) traffic to port ${TP_PORT}"
     if [[ $NO4 -eq 0 ]]; then
         iptb 4 n nat N lrt${$}${SUBNET_IFACE}-TP || die
         iptb 4 n nat A lrt${$}${SUBNET_IFACE}-TP -d 0.0.0.0/8 -j RETURN || die
@@ -1119,6 +1135,10 @@ backup_interface_status() {
     # nm managing status is saved when nm_set_unmanaged()
 }
 restore_interface_status() {
+    # virtual wifi interface will be destroyed, so no need to restore status
+    # don't use [[ $VWIFI_IFACE ]] to judge, if creating virtual wifi failed, VWIFI_IFACE is empty
+    [[ "$WIFI_IFACE" && "$NO_VIRT" -eq 0 ]] && return
+    
     restore_ipv6_bits
 
     if [[ -n "$OLD_MACADDR" && "$(get_interface_mac $SUBNET_IFACE)" != "$OLD_MACADDR" ]] ; then
@@ -1128,6 +1148,7 @@ restore_interface_status() {
     
     nm_restore_manage
     
+    [[ $SUBNET_IFACE_ORIGINAL_UP_STATUS -eq 1 ]] && ip link set up dev ${SUBNET_IFACE} && echo "Restore ${SUBNET_IFACE} to link up"
 }
 #---------------------------------------
 
@@ -1150,7 +1171,12 @@ kill_processes() { # for this instance
 _cleanup() {
     local x
 
+    ip addr flush ${SUBNET_IFACE}
+    
     rm -rf $CONFDIR
+    
+    ip link set down dev ${SUBNET_IFACE}
+    
     if [[ $VWIFI_IFACE ]]; then # the subnet interface (virtual wifi interface) will be removed
         iw dev ${VWIFI_IFACE} del
         dealloc_vface_name $VWIFI_IFACE
@@ -1197,7 +1223,7 @@ cleanup() {
     #kill -9 -$pgid
 }
 
-# NOTE function die() is designed not to be used before init_trap() executed
+# NOTE function die() is designed NOT to be used before init_trap() executed
 die() { # SIGUSR2
     echo "Error occured"
     [[ -n "$1" ]] && echo -e "\nERROR: $1\n" >&2
@@ -1559,6 +1585,18 @@ check_wifi_settings() {
         fi
         echo "WARN: If AP doesn't work, read https://github.com/oblique/create_ap/blob/master/howto/realtek.md" >&2
     fi
+
+    if [[ -z $VIRT_NAME ]]; then
+        if [[ ${#WIFI_IFACE} -gt 13 ]]; then
+            echo "WARN: $WIFI_IFACE has ${#WIFI_IFACE} characters which might be too long. If AP doesn't work, see --virt-name and https://github.com/garywill/linux-router/issues/44" >&2
+        fi
+    elif [[ ${#VIRT_NAME} -gt 15 ]]; then
+        echo "WARN: option --virt-name $VIRT_NAME has ${#VIRT_NAME} characters which might be too long, consider making it shorter in case of errors" >&2
+    fi
+
+    if [[ ! -z $VIRT_NAME ]] && is_vface_name_allocated $VIRT_NAME; then
+      echo "WARN: interface $VIRT_NAME aleady exists, this will cause an error"
+    fi
 }
 
 check_if_new_mac_valid() {
@@ -1586,13 +1624,15 @@ decide_target_interface() {
 
 decide_ip_addresses() {
     if [[ ! -n $GATEWAY ]]; then
-        echo
+        GATEWAY="$(generate_random_ip4)"
+        echo "Use random LAN IPv4 address $GATEWAY"
     elif [[ ! "$GATEWAY" =~ "." ]]; then
         GATEWAY="192.168.${GATEWAY}.1"
     fi
 
     if [[ $IPV6 -eq 1 && ! -n $PREFIX6 ]]; then
-        echo
+        PREFIX6="$(generate_random_lan_ip6_prefix)"
+        echo "Use random LAN IPv6 address ${PREFIX6}${IID6}"
     elif [[ ! "$PREFIX6" =~ ":" ]]; then
         PREFIX6="fd00:0:0:${PREFIX6}::"
     fi
@@ -1634,7 +1674,13 @@ prepare_wifi_interface() {
             echo "${VWIFI_IFACE} created"
         else
             VWIFI_IFACE=
-            die "Failed creating virtual WiFi interface. Maybe your WiFi adapter does not fully support virtual interfaces. Try again with '--no-virt'"
+            if [[ ! -z ${VIRT_NAME} ]] && [[ ${#VIRT_NAME} -gt 15 ]]; then
+              die "Failed creating virtual WiFi interface. This is likely because you have set a long name for your virtual interface using --virt-name, try making it shorter'"
+            elif [[ -z ${VIRT_NAME} ]] && [[ ${#WIFI_IFACE} -gt 13 ]]; then
+              die "Failed creating virtual WiFi interface. This is likely because your interface name is too long. Try using '--virt-name <shorter interface name>'"
+            else
+              die "Failed creating virtual WiFi interface. Maybe your WiFi adapter does not fully support virtual interfaces. Try again with '--no-virt'"
+            fi
         fi
         
         AP_IFACE=${VWIFI_IFACE}
@@ -1810,6 +1856,10 @@ write_dnsmasq_conf() {
 			no-poll
 		EOF
     fi
+    if [[ $DNS_NOCACHE -eq 1 ]]; then
+        echo "cache-size=0" >> "$CONFDIR/dnsmasq.conf"
+        echo "no-negcache" >> "$CONFDIR/dnsmasq.conf"
+    fi
     if [[ $IPV6 -eq 1 ]];then
         cat <<- EOF  >> "$CONFDIR/dnsmasq.conf"
 			listen-address=${GATEWAY6}
@@ -1939,10 +1989,6 @@ phead
 phead2
 echo
 
-echo
-echo "This is workaround for #31. Must use with '-g' and for wired interface !"
-echo
-
 echo "PID: $$"
 
 TARGET_IFACE="$(decide_target_interface)" || exit 1 # judge wired (-i CONN_IFACE) or wireless hotspot (--ap $WIFI_IFACE)
@@ -1997,15 +2043,24 @@ fi
 [[ $NO_DNSMASQ -eq 0 ]] && write_dnsmasq_conf
 #===========================
 
+# initialize subnet interface
+# take subnet interface down first
+ip link set down dev ${SUBNET_IFACE} || die "Failed setting ${SUBNET_IFACE} down"
+# flush old IPs of subnet interface
+ip addr flush ${SUBNET_IFACE} || die "Failed flush ${SUBNET_IFACE} IP"
 
 dealwith_mac # setting MAC should be after setting NM unmanaged
 
 [[ $WIFI_IFACE ]] && check_rfkill_unblock_wifi
 
+# bring subnet interface up
+ip link set up dev ${SUBNET_IFACE} || die "Failed bringing ${SUBNET_IFACE} up"
 
 # hostapd , haveged
 [[ $WIFI_IFACE ]] && run_wifi_ap_processes
 
+# add ipv4 address to subnet interface
+ip -4 addr add ${GATEWAY}/24 broadcast ${GATEWAY%.*}.255 dev ${SUBNET_IFACE} || die "Failed setting ${SUBNET_IFACE} IPv4 address"
 
 set_ipv6_bits