1 files changed, 182 insertions, 0 deletions
diff --git a/tv/3modules/wwan.nix b/tv/3modules/wwan.nix
new file mode 100644
index 000000000..382f5a535
--- /dev/null
+++ b/tv/3modules/wwan.nix
@@ -0,0 +1,182 @@
+with import ./lib;
+{ config, pkgs, ... }: {
+  options = {
+    tv.wwan.enable = mkEnableOption "tv.wwan";
+    tv.wwan.apn = mkOption {
+      type = with types; filename;
+    };
+    tv.wwan.device = mkOption {
+      type = with types; pathname;
+      default = "/dev/cdc-wdm0";
+    };
+    tv.wwan.interface = mkOption {
+      type = with types; nullOr filename;
+      default = null;
+    };
+    tv.wwan.operators = mkOption {
+      type = with types; listOf username;
+      default = [];
+    };
+    tv.wwan.secrets = mkOption {
+      type = with types; pathname;
+      default = toString <secrets/wwan.json>;
+      # format: {"pin1":number}
+    };
+  };
+  config = let
+    cfg = config.tv.wwan;
+  in mkIf cfg.enable {
+    nixpkgs.overlays = singleton (self: super: {
+      uqmi-wrapper = pkgs.symlinkJoin {
+        name = "uqmi-wrapper";
+        paths = [
+          (pkgs.writeDashBin "uqmi" ''
+            exec ${pkgs.uqmi}/bin/uqmi --device=${cfg.device} "$@"
+          '')
+          (pkgs.writeTextDir "share/bash-completion/completions/uqmi" /* sh */''
+            _uqmi_complete() {
+              case ''${#COMP_WORDS[@]} in
+                2)
+                  COMPREPLY=($(compgen -W "$(
+                    ${pkgs.uqmi}/bin/uqmi --help 2>&1 |
+                    ${pkgs.coreutils}/bin/tr , \\n |
+                    ${pkgs.gnused}/bin/sed -nr 's/^ *(-[a-z-]+).*/\1/p'
+                  )" -- "''${COMP_WORDS[1]}"))
+                ;;
+              esac
+            }
+            complete -F _uqmi_complete uqmi
+          '')
+          pkgs.uqmi
+        ];
+      };
+    });
+    systemd.services.wwan = {
+      environment = {
+        SECRETS = "%d/secrets";
+      };
+      path = [
+        pkgs.busybox
+        pkgs.coreutils
+        pkgs.iproute2
+        pkgs.jq
+        pkgs.uqmi-wrapper
+        (pkgs.writeDashBin "get-interface" (
+          if cfg.interface != null then /* sh */ ''
+            echo ${cfg.interface}
+          '' else /* sh */ ''
+            exec ${pkgs.libqmi}/bin/qmicli -d ${cfg.device} -p --get-wwan-iface
+          ''
+        ))
+      ];
+      serviceConfig = {
+        LoadCredential = [
+          "secrets:${cfg.secrets}"
+        ];
+        Type = "oneshot";
+        RemainAfterExit = true;
+        SyslogIdentifier = "wwan";
+        ExecStart = pkgs.writeDash "tv.wwan.start.sh" ''
+          set -efu
+
+          interface=$(get-interface)
+
+          pin1_status=$(
+            uqmi --uim-get-sim-state |
+            jq -r '"\(.pin1_status)/\(.pin1_verify_tries)"'
+          )
+          case $pin1_status in
+            verified/*)
+              :
+              ;;
+            not_verified/3)
+              pin1=$(jq .pin1 "$SECRETS")
+              echo "verifying PIN1" >&2
+              if ! uqmi --uim-verify-pin1 "$pin1"; then
+                echo "error: failed to verify PIN1" >&2
+                exit 1
+              fi
+              ;;
+            not_verified/*)
+              echo "error: not trying to verify PIN1: not enough tries left" >&2
+              echo \
+                  "please check your configuration in ${cfg.secrets}" \
+                  " and verify if manually using:" \
+                  " ${pkgs.uqmi}/bin/uqmi -d $device --uim-veriy-pin1 XXXX" \
+                  >&2
+              exit 1
+          esac
+
+          raw_ip_path=/sys/class/net/$interface/qmi/raw_ip
+          raw_ip=$(cat "$raw_ip_path")
+          if [ "$raw_ip" != Y ]; then
+            echo "enabling raw-ip" >&2
+            if ! echo Y > "$raw_ip_path"; then
+              echo "error: failed to enable raw-ip" >&2
+              exit 1
+            fi
+          fi
+
+          operating_mode=$(uqmi --get-device-operating-mode | tr -d \")
+          case $operating_mode in
+            online)
+              :
+              ;;
+            persistent_low_power|low_power)
+              echo "settings device operating mode to online" >&2
+              uqmi --set-device-operating-mode online
+              operating_mode=$(uqmi --get-device-operating-mode | tr -d \")
+              if test "$operating_mode" != online; then
+                echo "error: failed to set device operating mode to online" >&2
+                exit 1
+              fi
+              ;;
+            *)
+              echo "error: don't know how to change device operating mode to online: $operating_mode" >&2
+              exit 1
+          esac
+
+          ip link set dev "$interface" up
+
+          data_status=$(uqmi --get-data-status | tr -d \")
+          case $data_status in
+            connected)
+              :
+              ;;
+            disconnected)
+              echo "starting network (APN=${cfg.apn})" >&2
+              sleep 1
+              uqmi \
+                  --start-network \
+                  --autoconnect \
+                  --apn ${cfg.apn} \
+                  --ip-family ipv4
+              sleep 1
+              ;;
+            *)
+              echo "error: unsupported data status: $data_status" >&2
+              exit 1
+          esac
+
+          udhcpc -q -f -n -i "$interface"
+        '';
+        Restart = "on-failure";
+        ExecStop = pkgs.writeDash "tv.wwan.stop.sh" ''
+          set -efu
+
+          interface=$(get-interface)
+
+          ip addr flush "$interface"
+          ip link set dev "$interface" down
+          uqmi --stop-network 0xFFFFFFFF --autoconnect
+          uqmi --sync
+          uqmi --set-device-operating-mode persistent_low_power
+        '';
+      };
+    };
+    users.users.root.packages = [
+      pkgs.uqmi-wrapper
+    ];
+    tv.systemd.services.wwan.operators = cfg.operators;
+  };
+}