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netstat: Add -e argument

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This adds information about the user owning the process to our netstat
output. We do not fully match the behaviour of Linux as we don't show
an inode information.
This commit is contained in:
Fabian Dellwing 2023-05-01 20:14:22 +02:00 committed by Jelle Raaijmakers
parent 34d699b678
commit 2cd59df443
Notes: sideshowbarker 2024-07-17 03:35:16 +09:00 
Author: https://github.com/fdellwing
Commit: https://github.com/SerenityOS/serenity/commit/2cd59df443
Pull-request: https://github.com/SerenityOS/serenity/pull/18366
Reviewed-by: https://github.com/gmta ✅
Reviewed-by: https://github.com/trflynn89
2 changed files with 19 additions and 1 deletions
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3
Base/usr/share/man/man1/netstat.md
View file

@ -5,7 +5,7 @@ netstat
## Synopsis
```sh
$ netstat [--all] [--list] [--tcp] [--udp] [--numeric] [--program] [--wide]
$ netstat [--all] [--list] [--tcp] [--udp] [--numeric] [--program] [--wide] [--extend]
```
## Description
@ -21,5 +21,6 @@ Display network connections
* `-n`, `--numeric`: Display numerical addresses
* `-p`, `--program`: Show the PID and name of the program to which each socket belongs
* `-W`, `--wide`: Do not truncate IP addresses by printing out the whole symbolic host
* `-e`, `--extend`: Display more information
<!-- Auto-generated through ArgsParser -->

17
Userland/Utilities/netstat.cpp
View file

@ -32,6 +32,7 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
bool flag_numeric = false;
bool flag_program = false;
bool flag_wide = false;
bool flag_extend = false;
Core::ArgsParser args_parser;
args_parser.set_general_help("Display network connections");
@ -42,6 +43,7 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
args_parser.add_option(flag_numeric, "Display numerical addresses", "numeric", 'n');
args_parser.add_option(flag_program, "Show the PID and name of the program to which each socket belongs", "program", 'p');
args_parser.add_option(flag_wide, "Do not truncate IP addresses by printing out the whole symbolic host", "wide", 'W');
args_parser.add_option(flag_extend, "Display more information", "extend", 'e');
args_parser.parse(arguments);
TRY(Core::System::unveil("/sys/kernel/net", "r"));
@ -87,6 +89,7 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
int local_address_column = -1;
int peer_address_column = -1;
int state_column = -1;
int user_column = -1;
int program_column = -1;
auto add_column = [&](auto title, auto alignment, auto width) {
@ -100,6 +103,7 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
local_address_column = add_column("Local Address", Alignment::Left, 22);
peer_address_column = add_column("Peer Address", Alignment::Left, 22);
state_column = add_column("State", Alignment::Left, 11);
user_column = flag_extend ? add_column("User", Alignment::Left, 4) : -1;
program_column = flag_program ? add_column("PID/Program", Alignment::Left, 11) : -1;
auto print_column = [](auto& column, auto& string) {
@ -132,6 +136,13 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
return DeprecatedString::formatted("{}/{}", pid, program.value());
};
auto get_formatted_user = [&](i32 uid) -> ErrorOr<String> {
if (uid == -1)
return String::from_utf8_short_string("-"sv);
return String::number(uid);
};
if (!has_protocol_flag || flag_tcp || flag_udp) {
if (flag_program && current_uid != 0) {
outln("(Some processes could not be identified, non-owned process info will not be shown)");
@ -219,6 +230,7 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
}
auto state = if_object.get_deprecated_string("state"sv).value_or({});
auto origin_uid = if_object.get_i32("origin_uid"sv).value_or(-1);
auto origin_pid = (if_object.has("origin_pid"sv)) ? if_object.get_u32("origin_pid"sv).value_or(0) : -1;
if (!flag_all && ((state == "Listen" && !flag_list) || (state != "Listen" && flag_list)))
@ -236,6 +248,8 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
columns[peer_address_column].buffer = get_formatted_address(peer_address, peer_port);
if (state_column != -1)
columns[state_column].buffer = state;
if (flag_extend && user_column != -1)
columns[user_column].buffer = TRY(get_formatted_user(origin_uid)).to_deprecated_string();
if (flag_program && program_column != -1)
columns[program_column].buffer = get_formatted_program(origin_pid);
@ -303,6 +317,7 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
}
auto origin_pid = (if_object.has("origin_pid"sv)) ? if_object.get_u32("origin_pid"sv).value_or(0) : -1;
auto origin_uid = if_object.get_i32("origin_uid"sv).value_or(-1);
if (protocol_column != -1)
columns[protocol_column].buffer = "udp";
@ -316,6 +331,8 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
columns[peer_address_column].buffer = get_formatted_address(peer_address, peer_port);
if (state_column != -1)
columns[state_column].buffer = "-";
if (flag_extend && user_column != -1)
columns[user_column].buffer = TRY(get_formatted_user(origin_uid)).to_deprecated_string();
if (flag_program && program_column != -1)
columns[program_column].buffer = get_formatted_program(origin_pid);