Userland: Move command-line utilities to Userland/Utilities/

1 files changed, 130 insertions, 0 deletions

diff --git a/Userland/Utilities/w.cpp b/Userland/Utilities/w.cpp
new file mode 100644
index 0000000000..4c9dbc106b
--- /dev/null
+++ b/Userland/Utilities/w.cpp
@@ -0,0 +1,130 @@
+/*
+ * Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <AK/ByteBuffer.h>
+#include <AK/JsonObject.h>
+#include <AK/JsonValue.h>
+#include <LibCore/DateTime.h>
+#include <LibCore/File.h>
+#include <LibCore/ProcessStatisticsReader.h>
+#include <pwd.h>
+#include <stdio.h>
+#include <sys/stat.h>
+#include <time.h>
+
+int main()
+{
+    if (pledge("stdio rpath", nullptr) < 0) {
+        perror("pledge");
+        return 1;
+    }
+
+    if (unveil("/dev", "r") < 0) {
+        perror("unveil");
+        return 1;
+    }
+
+    if (unveil("/etc/passwd", "r") < 0) {
+        perror("unveil");
+        return 1;
+    }
+
+    if (unveil("/var/run/utmp", "r") < 0) {
+        perror("unveil");
+        return 1;
+    }
+
+    if (unveil("/proc", "r") < 0) {
+        perror("unveil");
+        return 1;
+    }
+
+    unveil(nullptr, nullptr);
+
+    auto file_or_error = Core::File::open("/var/run/utmp", Core::IODevice::ReadOnly);
+    if (file_or_error.is_error()) {
+        warnln("Error: {}", file_or_error.error());
+        return 1;
+    }
+    auto& file = *file_or_error.value();
+    auto json = JsonValue::from_string(file.read_all());
+    if (!json.has_value() || !json.value().is_object()) {
+        warnln("Error: Could not parse /var/run/utmp");
+        return 1;
+    }
+
+    auto process_statistics = Core::ProcessStatisticsReader::get_all();
+    if (!process_statistics.has_value()) {
+        warnln("Error: Could not get process statistics");
+        return 1;
+    }
+
+    auto now = time(nullptr);
+
+    printf("\033[1m%-10s %-12s %-16s %-6s %s\033[0m\n",
+        "USER", "TTY", "LOGIN@", "IDLE", "WHAT");
+    json.value().as_object().for_each_member([&](auto& tty, auto& value) {
+        const JsonObject& entry = value.as_object();
+        auto uid = entry.get("uid").to_u32();
+        [[maybe_unused]] auto pid = entry.get("pid").to_i32();
+
+        auto login_time = Core::DateTime::from_timestamp(entry.get("login_at").to_number<time_t>());
+        auto login_at = login_time.to_string("%b%d %H:%M:%S");
+
+        auto* pw = getpwuid(uid);
+        String username;
+        if (pw)
+            username = pw->pw_name;
+        else
+            username = String::number(uid);
+
+        StringBuilder builder;
+        String idle_string = "n/a";
+        struct stat st;
+        if (stat(tty.characters(), &st) == 0) {
+            auto idle_time = now - st.st_mtime;
+            if (idle_time >= 0) {
+                builder.appendf("%llds", idle_time);
+                idle_string = builder.to_string();
+            }
+        }
+
+        String what = "n/a";
+
+        for (auto& it : process_statistics.value()) {
+            if (it.value.tty == tty && it.value.pid == it.value.pgid)
+                what = it.value.name;
+        }
+
+        printf("%-10s %-12s %-16s %-6s %s\n",
+            username.characters(),
+            tty.characters(),
+            login_at.characters(),
+            idle_string.characters(),
+            what.characters());
+    });
+    return 0;
+}