initial impl

diff --git a/src/main.cpp b/src/main.cpp
index e69de29bb2d1d6434b8b29ae775ad8c2e48c5391..2e5a20ac38b82df687cd1693cabbb15316119d6c 100644 (file)
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -0,0 +1,145 @@
+#include <algorithm>
+#include <cerrno>
+#include <charconv>
+#include <cstdint>
+#include <cstring>
+#include <expected>
+#include <filesystem>
+#include <iostream>
+#include <optional>
+#include <ostream>
+#include <security-context-v1-client-protocol.h>
+#include <string_view>
+#include <sys/socket.h>
+#include <sys/un.h>
+#include <system_error>
+#include <wayland-client-core.h>
+#include <wayland-client-protocol.h>
+#include <wayland-client.h>
+
+struct App {
+  std::optional<wl_display *> display;
+  std::optional<wl_registry *> registry;
+  std::optional<wp_security_context_v1 *> security_context;
+  std::optional<wp_security_context_manager_v1 *> security_context_manager;
+};
+
+void register_global(void *data, wl_registry *registry, std::uint32_t name,
+                     const char *interface, std::uint32_t version) {
+  std::println(std::cerr, "global advertised: {}", interface);
+
+  App *app = static_cast<App *>(data);
+
+  if (std::strcmp(interface, wp_security_context_manager_v1_interface.name) ==
+      0) {
+    app->security_context_manager =
+        static_cast<wp_security_context_manager_v1 *>(wl_registry_bind(
+            registry, name, &wp_security_context_manager_v1_interface,
+            version));
+  }
+}
+
+void unregister_global([[gnu::unused]] void *data,
+                       [[gnu::unused]] wl_registry *registry,
+                       [[gnu::unused]] std::uint32_t name) {}
+
+struct wl_registry_listener listener = {.global = register_global,
+                                        .global_remove = unregister_global};
+
+std::optional<int> parse_int(std::string_view string) {
+  int number;
+
+  auto [ptr, err] =
+      std::from_chars(string.data(), string.data() + string.size(), number);
+
+  if (!(err == std::errc{})) {
+    return std::nullopt;
+  }
+
+  return number;
+}
+
+std::expected<int, int> open_socket(const std::filesystem::path &socket_path) {
+  int fd = socket(AF_UNIX, SOCK_STREAM, 0);
+  sockaddr_un address = {.sun_family = AF_UNIX, .sun_path = "\0"};
+  auto len =
+      std::min(sizeof(address.sun_path), std::strlen(socket_path.c_str()));
+
+  std::copy_n(socket_path.c_str(), len, address.sun_path);
+
+  if (bind(fd, reinterpret_cast<sockaddr *>(&address),
+           sizeof(address.sun_path)) == -1) {
+    return std::unexpected{errno};
+  }
+
+  if (listen(fd, 20) == -1) {
+    return std::unexpected{errno};
+  }
+
+  return fd;
+}
+
+int main(int argc, char **argv) {
+  if (argc < 2) {
+    std::println(
+        std::cerr,
+        "usage: wayland-sandbox <path to unix socket> <file descriptor>");
+    return 1;
+  }
+
+  std::filesystem::path socket_path(argv[1]);
+  if (std::filesystem::exists(socket_path)) {
+    std::println(std::cerr, "socket already exists: {}", argv[1]);
+    return 1;
+  }
+
+  auto parse_fd_result = parse_int(argv[2]);
+  if (!parse_fd_result) {
+    std::println(std::cerr, "failed to parse fd: {}", argv[2]);
+    return 1;
+  }
+
+  int close_fd = parse_fd_result.value();
+
+  App app;
+
+  app.display = wl_display_connect(NULL);
+
+  std::println(std::cerr, "connected to compositor");
+
+  if (!app.display.value()) {
+    std::println(std::cerr, "failed to connect to compositor");
+    return 1;
+  }
+
+  app.registry = wl_display_get_registry(app.display.value());
+  wl_registry_add_listener(app.registry.value(), &listener, &app);
+  wl_display_roundtrip(app.display.value());
+
+  if (!app.security_context_manager.has_value()) {
+    std::println(std::cerr, "failed to bind security context manager");
+  }
+
+  auto open_socket_result = open_socket(socket_path);
+
+  if (!open_socket_result) {
+    std::println(std::cerr, "failed to open socket: {}",
+                 std::strerror(open_socket_result.error()));
+    return 1;
+  }
+
+  auto sockfd = open_socket_result.value();
+
+  std::println(std::cerr, "opened socket: {}", socket_path.c_str());
+
+  app.security_context = wp_security_context_manager_v1_create_listener(
+      app.security_context_manager.value(), sockfd, close_fd);
+
+  wp_security_context_v1_set_sandbox_engine(app.security_context.value(),
+                                            "wayland-sandbox");
+  wp_security_context_v1_commit(app.security_context.value());
+
+  wl_display_roundtrip(app.display.value());
+
+  return 0;
+}