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netstat: Resolve ports to service names

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Brendan Coles 2022-04-03 09:13:28 +00:00 committed by Andreas Kling
parent 64564a54d4
commit fd6d87df82
Notes: sideshowbarker 2024-07-17 17:38:29 +09:00 
Author: https://github.com/bcoles
Commit: https://github.com/SerenityOS/serenity/commit/fd6d87df82
Pull-request: https://github.com/SerenityOS/serenity/pull/13457
2 changed files with 47 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] [--program]
$ netstat [--all] [--list] [--tcp] [--udp] [--numeric] [--program]
```
## Description
@ -21,6 +21,7 @@ Display network connections
* `-l`, `--list`: Display only listening sockets
* `-t`, `--tcp`: Display only TCP network connections
* `-u`, `--udp`: Display only UDP network connections
* `-n`, `--numeric`: Display numerical addresses
* `-p`, `--program`: Show the PID and name of the program to which each socket belongs
<!-- Auto-generated through ArgsParser -->

45
Userland/Utilities/netstat.cpp
View file

@ -14,6 +14,8 @@
#include <LibCore/ProcessStatisticsReader.h>
#include <LibCore/System.h>
#include <LibMain/Main.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <unistd.h>
ErrorOr<int> serenity_main(Main::Arguments arguments)
@ -22,12 +24,14 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
TRY(Core::System::unveil("/proc/net", "r"));
TRY(Core::System::unveil("/proc/all", "r"));
TRY(Core::System::unveil("/etc/passwd", "r"));
TRY(Core::System::unveil("/etc/services", "r"));
TRY(Core::System::unveil(nullptr, nullptr));
bool flag_all = false;
bool flag_list = false;
bool flag_tcp = false;
bool flag_udp = false;
bool flag_numeric = false;
bool flag_program = false;
Core::ArgsParser args_parser;
@ -36,6 +40,7 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
args_parser.add_option(flag_list, "Display only listening sockets", "list", 'l');
args_parser.add_option(flag_tcp, "Display only TCP network connections", "tcp", 't');
args_parser.add_option(flag_udp, "Display only UDP network connections", "udp", 'u');
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.parse(arguments);
@ -157,11 +162,31 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
auto bytes_in = if_object.get("bytes_in").to_string();
auto bytes_out = if_object.get("bytes_out").to_string();
auto peer_address = if_object.get("peer_address").to_string();
auto peer_port = if_object.get("peer_port").to_string();
if (!flag_numeric) {
auto service = getservbyport(htons(if_object.get("peer_port").to_u32()), "tcp");
if (service != nullptr) {
auto s_name = StringView(service->s_name);
if (!s_name.is_empty())
peer_port = s_name;
}
}
auto formatted_peer_address = String::formatted("{}:{}", peer_address, peer_port);
auto local_address = if_object.get("local_address").to_string();
auto local_port = if_object.get("local_port").to_string();
if (!flag_numeric) {
auto service = getservbyport(htons(if_object.get("local_port").to_u32()), "tcp");
if (service != nullptr) {
auto s_name = StringView(service->s_name);
if (!s_name.is_empty())
local_port = s_name;
}
}
auto formatted_local_address = String::formatted("{}:{}", local_address, local_port);
auto state = if_object.get("state").to_string();
auto origin_pid = (if_object.has("origin_pid")) ? if_object.get("origin_pid").to_u32() : -1;
@ -203,9 +228,29 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
auto& if_object = value.as_object();
auto local_address = if_object.get("local_address").to_string();
auto local_port = if_object.get("local_port").to_string();
if (!flag_numeric) {
auto service = getservbyport(htons(if_object.get("local_port").to_u32()), "udp");
if (service != nullptr) {
auto s_name = StringView(service->s_name);
if (!s_name.is_empty())
local_port = s_name;
}
}
auto peer_address = if_object.get("peer_address").to_string();
auto peer_port = if_object.get("peer_port").to_string();
if (!flag_numeric) {
auto service = getservbyport(htons(if_object.get("peer_port").to_u32()), "udp");
if (service != nullptr) {
auto s_name = StringView(service->s_name);
if (!s_name.is_empty())
peer_port = s_name;
}
}
auto origin_pid = (if_object.has("origin_pid")) ? if_object.get("origin_pid").to_u32() : -1;
if (protocol_column != -1)