ladybird/Userland/Utilities/arp.cpp
Ali Mohammad Pur 5e1499d104 Everywhere: Rename {Deprecated => Byte}String
This commit un-deprecates DeprecatedString, and repurposes it as a byte
string.
As the null state has already been removed, there are no other
particularly hairy blockers in repurposing this type as a byte string
(what it _really_ is).

This commit is auto-generated:
  $ xs=$(ack -l \bDeprecatedString\b\|deprecated_string AK Userland \
    Meta Ports Ladybird Tests Kernel)
  $ perl -pie 's/\bDeprecatedString\b/ByteString/g;
    s/deprecated_string/byte_string/g' $xs
  $ clang-format --style=file -i \
    $(git diff --name-only | grep \.cpp\|\.h)
  $ gn format $(git ls-files '*.gn' '*.gni')
2023-12-17 18:25:10 +03:30

168 lines
5.5 KiB
C++

/*
* Copyright (c) 2020, the SerenityOS developers.
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/Assertions.h>
#include <AK/IPv4Address.h>
#include <AK/JsonObject.h>
#include <AK/MACAddress.h>
#include <AK/QuickSort.h>
#include <AK/Types.h>
#include <LibCore/ArgsParser.h>
#include <LibCore/File.h>
#include <LibCore/System.h>
#include <LibMain/Main.h>
#include <arpa/inet.h>
#include <net/if_arp.h>
#include <net/route.h>
#include <netdb.h>
#include <netinet/in.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <unistd.h>
ErrorOr<int> serenity_main(Main::Arguments arguments)
{
TRY(Core::System::pledge("stdio rpath tty inet unix"));
static bool flag_set;
static bool flag_delete;
static bool flag_numeric;
StringView value_ipv4_address;
StringView value_hw_address;
Core::ArgsParser args_parser;
args_parser.set_general_help("Display or modify the system ARP cache");
args_parser.add_option(flag_set, "Set an ARP table entry", "set", 's');
args_parser.add_option(flag_delete, "Delete an ARP table entry", "delete", 'd');
args_parser.add_option(flag_numeric, "Display numerical addresses. Don't resolve hostnames", "numeric", 'n');
args_parser.add_positional_argument(value_ipv4_address, "IPv4 protocol address", "address", Core::ArgsParser::Required::No);
args_parser.add_positional_argument(value_hw_address, "Hardware address", "hwaddress", Core::ArgsParser::Required::No);
args_parser.parse(arguments);
TRY(Core::System::unveil("/sys/kernel/net/arp", "r"));
if (!flag_numeric)
TRY(Core::System::unveil("/tmp/portal/lookup", "rw"));
TRY(Core::System::unveil(nullptr, nullptr));
enum class Alignment {
Left,
Right
};
struct Column {
StringView title;
Alignment alignment { Alignment::Left };
int width { 0 };
StringView buffer;
};
Vector<Column> columns;
int proto_address_column = -1;
int hw_address_column = -1;
auto add_column = [&](auto title, auto alignment, auto width) {
columns.append({ title, alignment, width, {} });
return columns.size() - 1;
};
proto_address_column = add_column("Address"sv, Alignment::Left, 15);
hw_address_column = add_column("HWaddress"sv, Alignment::Left, 15);
auto print_column = [](auto& column, auto& string) {
if (!column.width) {
out("{}", string);
return;
}
if (column.alignment == Alignment::Right) {
out("{:>{1}} "sv, string, column.width);
} else {
out("{:<{1}} "sv, string, column.width);
}
};
for (auto& column : columns)
print_column(column, column.title);
outln();
if (!flag_set && !flag_delete) {
auto file = TRY(Core::File::open("/sys/kernel/net/arp"sv, Core::File::OpenMode::Read));
auto file_contents = TRY(file->read_until_eof());
auto json = TRY(JsonValue::from_string(file_contents));
Vector<JsonValue> sorted_regions = json.as_array().values();
quick_sort(sorted_regions, [](auto& a, auto& b) {
return a.as_object().get_byte_string("ip_address"sv).value_or({}) < b.as_object().get_byte_string("ip_address"sv).value_or({});
});
for (auto& value : sorted_regions) {
auto& if_object = value.as_object();
auto ip_address = if_object.get_byte_string("ip_address"sv).value_or({});
if (!flag_numeric) {
auto from_string = IPv4Address::from_string(ip_address);
auto addr = from_string.value().to_in_addr_t();
auto* hostent = gethostbyaddr(&addr, sizeof(in_addr), AF_INET);
if (hostent != nullptr) {
StringView host_name { hostent->h_name, strlen(hostent->h_name) };
if (!host_name.is_empty())
ip_address = host_name;
}
}
auto mac_address = if_object.get_byte_string("mac_address"sv).value_or({});
if (proto_address_column != -1)
columns[proto_address_column].buffer = ip_address;
if (hw_address_column != -1)
columns[hw_address_column].buffer = mac_address;
for (auto& column : columns)
print_column(column, column.buffer);
outln();
};
}
if (flag_set || flag_delete) {
if (value_ipv4_address.is_empty() || value_hw_address.is_empty()) {
warnln("No protocol address or hardware address specified.");
return 1;
}
auto address = IPv4Address::from_string(value_ipv4_address);
if (!address.has_value()) {
warnln("Invalid IPv4 protocol address: '{}'", value_ipv4_address);
return 1;
}
auto hw_address = MACAddress::from_string(value_hw_address);
if (!hw_address.has_value()) {
warnln("Invalid MACAddress: '{}'", value_hw_address);
return 1;
}
int fd = TRY(Core::System::socket(AF_INET, SOCK_DGRAM, IPPROTO_IP));
struct arpreq arp_req;
memset(&arp_req, 0, sizeof(arp_req));
arp_req.arp_pa.sa_family = AF_INET;
((sockaddr_in&)arp_req.arp_pa).sin_addr.s_addr = address.value().to_in_addr_t();
*(MACAddress*)&arp_req.arp_ha.sa_data[0] = hw_address.value();
if (flag_set)
TRY(Core::System::ioctl(fd, SIOCSARP, &arp_req));
if (flag_delete)
TRY(Core::System::ioctl(fd, SIOCDARP, &arp_req));
}
return 0;
}