1 files changed, 85 insertions, 0 deletions
diff --git a/configs/ppp.nix b/configs/ppp.nix
new file mode 100644
index 0000000..63e75af
--- /dev/null
+++ b/configs/ppp.nix
@@ -0,0 +1,85 @@
+{ config, mylib, pkgs, ... }: let
+  cfg = {
+    pin = "@${config.krebs.secret.directory}/o2.pin";
+    ttys.ppp = "/dev/ttyACM0";
+    ttys.com = "/dev/ttyACM1";
+  };
+in {
+  assertions = [
+    {
+      assertion =
+        config.networking.resolvconf.enable ||
+        config.networking.useNetworkd;
+      message = "ppp configuration needs resolvconf or networkd";
+    }
+  ];
+  environment.etc."ppp/ip-up".source = pkgs.writeDash "ppp.ip-up" ''
+    ${pkgs.openresolv}/bin/resolvconf -a "$IFNAME" < /etc/ppp/resolv.conf
+  '';
+  environment.etc."ppp/ip-down".source = pkgs.writeDash "ppp.ip-down" ''
+    ${pkgs.openresolv}/bin/resolvconf -fd "$IFNAME"
+  '';
+  environment.etc."ppp/peers/o2".text = /* sh */ ''
+    ${cfg.ttys.ppp}
+    921600
+    crtscts
+    defaultroute
+    holdoff 10
+    lock
+    maxfail 0
+    noauth
+    nodetach
+    noipdefault
+    passive
+    persist
+    usepeerdns
+    connect "${pkgs.ppp}/bin/chat ''${DEBUG+-v} -Ss -f ${pkgs.writeText "o2.chat" /* sh */ ''
+      ABORT "BUSY"
+      ABORT "NO CARRIER"
+      REPORT CONNECT
+      "*EMRDY: 1"
+      ATZ OK
+      AT+CFUN=1 OK
+      ${cfg.pin} TIMEOUT 2 ERROR-AT-OK
+      AT+CGDCONT=1,\042IP\042,\042internet\042 OK
+      ATDT*99***1# CONNECT
+    ''}"
+  '';
+  users.users.root.packages = [
+    (pkgs.writeDashBin "connect" ''
+      # usage:
+      #   connect wlan
+      #   connect wwan [PEERNAME]
+      set -efu
+      rfkill_wlan=/sys/class/rfkill/rfkill2
+      rfkill_wwan=/sys/class/rfkill/rfkill1
+      case $1 in
+        wlan)
+          ${pkgs.procps}/bin/pkill pppd || :
+          echo 0 > "$rfkill_wwan"/state
+          echo 1 > "$rfkill_wlan"/state
+          ;;
+        wwan)
+          name=''${2-o2}
+          echo 0 > "$rfkill_wlan"/state
+          echo 1 > "$rfkill_wwan"/state
+          ${pkgs.ppp}/bin/pppd call "$name" updetach
+          ;;
+        *)
+          echo "$0: error: bad arguments: $*" >&2
+          exit 1
+      esac
+    '')
+    (pkgs.writeDashBin "modem-send" ''
+      # usage: modem-send ATCOMMAND
+      set -efu
+      tty=${mylib.shell.escape cfg.ttys.com}
+      exec <"$tty"
+      printf '%s\r\n' "$1" >"$tty"
+      ${pkgs.gnused}/bin/sed -E '
+        /^OK\r?$/q
+        /^ERROR\r?$/q
+      '
+    '')
+  ];
+}