package/ppp/files/ppp.sh

   1 scan_ppp() {
   2         config_get ifname "$1" ifname
   3         pppdev="${pppdev:-0}"
   4         config_get devunit "$1" unit
   5         {
   6                 unit=
   7                 pppif=
   8                 if [ ! -d /tmp/.ppp-counter ]; then
   9                      mkdir -p /tmp/.ppp-counter
  10                 fi
  11                 local maxunit
  12                 maxunit="$(cat /tmp/.ppp-counter/max-unit 2>/dev/null)"
  13                 if [ -z "$maxunit" ]; then
  14                     maxunit=-1
  15                 fi
  16                 local i
  17                 i=0
  18                 while [ $i -le $maxunit ]; do
  19                      local unitdev
  20                      unitdev="$(cat /tmp/.ppp-counter/ppp${i} 2>/dev/null)"
  21                      if [ "$unitdev" = "$1" ]; then
  22                           unit="$i"
  23                           pppif="ppp${i}"
  24                           break
  25                      fi
  26                      i="$(($i + 1))"
  27                 done
  28                 if [ -z "$unit" ] || [ -z "$pppif" ]; then
  29                     maxunit="$(($maxunit + 1))"
  30                     if [ -n "$devunit" ]; then
  31                         unit="$devunit"
  32                     elif [ "${ifname%%[0-9]*}" = ppp ]; then
  33                          unit="${ifname##ppp}"
  34                     else
  35                          unit="$maxunit"
  36                     fi
  37                     [ "$maxunit" -lt "$unit" ] && maxunit="$unit"
  38                     pppif="ppp${unit}"
  39                     echo "$1" >/tmp/.ppp-counter/$pppif 2>/dev/null
  40                     echo "$maxunit" >/tmp/.ppp-counter/max-unit 2>/dev/null
  41                 fi
  42                 config_set "$1" ifname "ppp$unit"
  43                 config_set "$1" unit "$unit"
  44         }
  45 }
  46
  47 start_pppd() {
  48         local cfg="$1"; shift
  49         local ifname
  50
  51         # make sure the network state references the correct ifname
  52         scan_ppp "$cfg"
  53         config_get ifname "$cfg" ifname
  54         set_interface_ifname "$cfg" "$ifname"
  55
  56         # make sure only one pppd process is started
  57         lock "/var/lock/ppp-${cfg}"
  58         local pid="$(head -n1 /var/run/ppp-${cfg}.pid 2>/dev/null)"
  59         [ -d "/proc/$pid" ] && grep pppd "/proc/$pid/cmdline" 2>/dev/null >/dev/null && {
  60                 lock -u "/var/lock/ppp-${cfg}"
  61                 return 0
  62         }
  63
  64         # Workaround: sometimes hotplug2 doesn't deliver the hotplug event for creating
  65         # /dev/ppp fast enough to be used here
  66         [ -e /dev/ppp ] || mknod /dev/ppp c 108 0
  67
  68         local device
  69         config_get device "$cfg" device
  70
  71         local unit
  72         config_get unit "$cfg" unit
  73
  74         local username
  75         config_get username "$cfg" username
  76
  77         local password
  78         config_get password "$cfg" password
  79
  80         local keepalive
  81         config_get keepalive "$cfg" keepalive
  82
  83         local connect
  84         config_get connect "$cfg" connect
  85
  86         local disconnect
  87         config_get disconnect "$cfg" disconnect
  88
  89         local pppd_options
  90         config_get pppd_options "$cfg" pppd_options
  91
  92         local defaultroute
  93         config_get_bool defaultroute "$cfg" defaultroute 1
  94         [ "$defaultroute" -eq 1 ] && defaultroute="defaultroute replacedefaultroute" || defaultroute=""
  95
  96         local interval="${keepalive##*[, ]}"
  97         [ "$interval" != "$keepalive" ] || interval=5
  98
  99         local dns
 100         config_get dns "$config" dns
 101
 102         local has_dns=0
 103         local peer_default=1
 104         [ -n "$dns" ] && {
 105                 has_dns=1
 106                 peer_default=0
 107         }
 108
 109         local peerdns
 110         config_get_bool peerdns "$cfg" peerdns $peer_default
 111
 112         echo -n "" > /tmp/resolv.conf.auto
 113
 114         [ "$peerdns" -eq 1 ] && {
 115                 peerdns="usepeerdns"
 116         } || {
 117                 peerdns=""
 118                 for dns in $dns; do
 119                         echo "nameserver $dns" >> /tmp/resolv.conf.auto
 120                 done
 121         }
 122
 123         local demand
 124         config_get_bool demand "$cfg" demand 0
 125
 126         local demandargs
 127         [ "$demand" -eq 1 ] && {
 128                 demandargs="precompiled-active-filter /etc/ppp/filter demand idle"
 129                 [ "$has_dns" -eq 0 ] && \
 130                         echo "nameserver 1.1.1.1" > /tmp/resolv.conf.auto
 131         } || {
 132                 demandargs="persist"
 133         }
 134
 135         local ipv6
 136         config_get_bool ipv6 "$cfg" ipv6 0
 137         [ "$ipv6" -eq 1 ] && ipv6="+ipv6" || ipv6=""
 138
 139         /usr/sbin/pppd "$@" \
 140                 ${keepalive:+lcp-echo-interval $interval lcp-echo-failure ${keepalive%%[, ]*}} \
 141                 $demandargs \
 142                 $peerdns \
 143                 $defaultroute \
 144                 ${username:+user "$username" password "$password"} \
 145                 unit "$unit" \
 146                 linkname "$cfg" \
 147                 ipparam "$cfg" \
 148                 ${connect:+connect "$connect"} \
 149                 ${disconnect:+disconnect "$disconnect"} \
 150                 ${ipv6} \
 151                 ${pppd_options}
 152
 153         lock -u "/var/lock/ppp-${cfg}"
 154 }
 155
 156 setup_interface_ppp() {
 157         local iface="$1"
 158         local config="$2"
 159
 160         local device
 161         config_get device "$config" device
 162
 163         local mtu
 164         config_get mtu "$config" mtu
 165
 166         mtu=${mtu:-1492}
 167         start_pppd "$config" \
 168                 mtu $mtu mru $mtu \
 169                 "$device"
 170 }
 171