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Utilities: Support static assignment of the ARP table

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brapru 2021-07-24 20:29:48 -04:00 committed by Andreas Kling
parent 7e40c17460
commit bdaaff70cb
Notes: sideshowbarker 2024-07-18 08:21:23 +09:00 
Author: https://github.com/brapru
Commit: https://github.com/SerenityOS/serenity/commit/bdaaff70cb6
Pull-request: https://github.com/SerenityOS/serenity/pull/8996
2 changed files with 80 additions and 12 deletions
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1
Kernel/Net/NetworkTask.cpp
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@ -150,7 +150,6 @@ void handle_arp(const EthernetFrameHeader& eth, size_t frame_size)
if (!packet.sender_hardware_address().is_zero() && !packet.sender_protocol_address().is_zero()) {
// Someone has this IPv4 address. I guess we can try to remember that.
// FIXME: Protect against ARP spamming.
// FIXME: Support static ARP table entries.
update_arp_table(packet.sender_protocol_address(), packet.sender_hardware_address(), UpdateArp::Set);
}

91
Userland/Utilities/arp.cpp
View File

@ -6,29 +6,98 @@
#include <AK/Assertions.h>
#include <AK/ByteBuffer.h>
#include <AK/IPv4Address.h>
#include <AK/JsonObject.h>
#include <AK/MACAddress.h>
#include <AK/String.h>
#include <AK/Types.h>
#include <LibCore/ArgsParser.h>
#include <LibCore/File.h>
#include <net/if.h>
#include <net/route.h>
#include <netinet/in.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
int main()
int main(int argc, char** argv)
{
static bool flag_set;
static bool flag_delete;
const char* value_ipv4_address = nullptr;
const char* value_hw_address = nullptr;
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_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(argc, argv);
auto file = Core::File::construct("/proc/net/arp");
if (!file->open(Core::OpenMode::ReadOnly)) {
warnln("Failed to open {}: {}", file->name(), file->error_string());
return 1;
}
outln("Address HWaddress");
auto file_contents = file->read_all();
auto json = JsonValue::from_string(file_contents);
VERIFY(json.has_value());
json.value().as_array().for_each([](auto& value) {
auto& if_object = value.as_object();
if (!flag_set && !flag_delete) {
outln("Address HWaddress");
auto file_contents = file->read_all();
auto json = JsonValue::from_string(file_contents);
VERIFY(json.has_value());
json.value().as_array().for_each([](auto& value) {
auto& if_object = value.as_object();
auto ip_address = if_object.get("ip_address").to_string();
auto mac_address = if_object.get("mac_address").to_string();
auto ip_address = if_object.get("ip_address").to_string();
auto mac_address = if_object.get("mac_address").to_string();
outln("{:15} {:17}", ip_address, mac_address);
});
outln("{:15} {:17}", ip_address, mac_address);
});
}
if (flag_set || flag_delete) {
if (!value_ipv4_address || !value_hw_address) {
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 = socket(AF_INET, SOCK_DGRAM, IPPROTO_IP);
if (fd < 0) {
perror("socket");
return 1;
}
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();
int rc;
if (flag_set)
rc = ioctl(fd, SIOCSARP, &arp_req);
if (flag_delete)
rc = ioctl(fd, SIOCDARP, &arp_req);
if (rc < 0) {
perror("ioctl");
return 1;
}
}
return 0;
}