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https://github.com/RGBCube/serenity
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dcd47655d0
To keep track of ongoing terminal sessions, we now have a sort-of traditional /var/run/utmp file, like other Unix systems. Unlike other Unix systems however, ours is of course JSON. :^) The /bin/utmpupdate program is used to update the file, which is not writable by regular user accounts. This helper program is set-GID "utmp".
82 lines
2.2 KiB
C++
82 lines
2.2 KiB
C++
#include <AK/JsonObject.h>
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#include <AK/JsonValue.h>
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#include <LibCore/ArgsParser.h>
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#include <LibCore/File.h>
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#include <LibCore/DateTime.h>
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// utmpupdate -c /dev/pts/0
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// utmpupdate -d /dev/pts/0
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int main(int argc, char** argv)
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{
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pid_t pid = 0;
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bool flag_create = false;
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bool flag_delete = false;
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const char* tty_name = nullptr;
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const char* from = nullptr;
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Core::ArgsParser args_parser;
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args_parser.add_option(flag_create, "Create entry", "create", 'c');
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args_parser.add_option(flag_delete, "Delete entry", "delete", 'd');
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args_parser.add_option(pid, "PID", "PID", 'p', "PID");
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args_parser.add_option(from, "From", "from", 'f', "From");
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args_parser.add_positional_argument(tty_name, "TTY name", "tty");
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args_parser.parse(argc, argv);
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if (flag_create && flag_delete) {
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warn() << "-c and -d are mutually exclusive";
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return 1;
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}
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dbg() << "Updating utmp from UID=" << getuid() << " GID=" << getgid() << " EGID=" << getegid() << " PID=" << pid;
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auto file_or_error = Core::File::open("/var/run/utmp", Core::IODevice::ReadWrite);
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if (file_or_error.is_error()) {
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dbg() << "Error: " << file_or_error.error();
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return 1;
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}
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auto& file = *file_or_error.value();
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auto file_contents = file.read_all();
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auto previous_json = JsonValue::from_string(file_contents);
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JsonObject json;
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if (!previous_json.has_value() || !previous_json.value().is_object()) {
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dbg() << "Error: Could not parse JSON";
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} else {
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json = previous_json.value().as_object();
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}
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if (flag_create) {
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JsonObject entry;
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entry.set("pid", pid);
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entry.set("uid", getuid());
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entry.set("from", from);
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entry.set("login_at", Core::DateTime::now().to_string());
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json.set(tty_name, move(entry));
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} else {
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ASSERT(flag_delete);
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dbg() << "Removing " << tty_name << " from utmp";
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json.remove(tty_name);
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}
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if (!file.seek(0)) {
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dbg() << "Seek failed";
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return 1;
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}
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if (!file.truncate(0)) {
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dbg() << "Truncation failed";
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return 1;
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}
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if (!file.write(json.to_string())) {
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dbg() << "Write failed";
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return 1;
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}
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return 0;
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}
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