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DHCPClient: Resend DHCP packets when we don't receive an answer

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Previously we'd only only send one DHCP request for network interfaces
which were up when DHCPClient started. If that packet was lost we'd
never send another request for those interfaces.

Also, if an interface were to appear after DHCPClient started (not
that that is possible at the moment) we wouldn't send requests for
that interface either.
This commit is contained in:
Gunnar Beutner 2021-05-26 07:26:07 +02:00 • committed by Ali Mohammad Pur
parent 2952c86f38
commit c73116b2e2
3 changed files with 30 additions and 42 deletions
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53
Userland/Services/DHCPClient/DHCPv4Client.cpp
View file

@ -112,9 +112,7 @@ static void set_params(const InterfaceDescriptor& iface, const IPv4Address& ipv4
}
}
DHCPv4Client::DHCPv4Client(Vector<InterfaceDescriptor> ifnames_for_immediate_discover, Vector<InterfaceDescriptor> ifnames_for_later)
: m_ifnames_for_immediate_discover(move(ifnames_for_immediate_discover))
, m_ifnames_for_later(move(ifnames_for_later))
DHCPv4Client::DHCPv4Client()
{
m_server = Core::UDPServer::construct(this);
m_server->on_ready_to_receive = [this] {
@ -133,36 +131,37 @@ DHCPv4Client::DHCPv4Client(Vector<InterfaceDescriptor> ifnames_for_immediate_dis
VERIFY_NOT_REACHED();
}
for (auto& iface : m_ifnames_for_immediate_discover)
dhcp_discover(iface);
m_check_timer = Core::Timer::create_repeating(
1000, [this] { try_discover_ifs(); }, this);
m_fail_check_timer = Core::Timer::create_repeating(
1000, [this] { try_discover_deferred_ifs(); }, this);
m_check_timer->start();
m_fail_check_timer->start();
try_discover_ifs();
}
void DHCPv4Client::try_discover_deferred_ifs()
void DHCPv4Client::try_discover_ifs()
{
auto current_interval = m_fail_check_timer->interval();
if (current_interval < m_max_timer_backoff_interval)
current_interval *= 1.9f;
m_fail_check_timer->set_interval(current_interval);
if (m_ifnames_for_later.is_empty())
return;
// See if any of them are now up.
auto ifs_result = get_discoverable_interfaces();
if (ifs_result.is_error())
return;
bool sent_discover_request = false;
Interfaces& ifs = ifs_result.value();
for (auto& iface : ifs.ready) {
if (!m_ifnames_for_later.remove_first_matching([&](auto& if_) { return if_.m_ifname == iface.m_ifname; }))
if (iface.m_current_ip_address != IPv4Address { 0, 0, 0, 0 })
continue;
deferred_invoke([this, iface](auto&) { dhcp_discover(iface); });
dhcp_discover(iface);
sent_discover_request = true;
}
if (sent_discover_request) {
auto current_interval = m_check_timer->interval();
if (current_interval < m_max_timer_backoff_interval)
current_interval *= 1.9f;
m_check_timer->set_interval(current_interval);
} else {
m_check_timer->set_interval(1000);
}
}
@ -192,12 +191,14 @@ Result<DHCPv4Client::Interfaces, String> DHCPv4Client::get_discoverable_interfac
auto name = if_object.get("name").to_string();
auto mac = if_object.get("mac_address").to_string();
auto is_up = if_object.get("link_up").to_bool();
auto ipv4_addr_maybe = IPv4Address::from_string(if_object.get("ipv4_address").to_string());
auto ipv4_addr = ipv4_addr_maybe.has_value() ? ipv4_addr_maybe.value() : IPv4Address { 0, 0, 0, 0 };
if (is_up) {
dbgln_if(DHCPV4_DEBUG, "Found adapter '{}' with mac {}, and it was up!", name, mac);
ifnames_to_immediately_discover.empend(name, mac_from_string(mac));
ifnames_to_immediately_discover.empend(name, mac_from_string(mac), ipv4_addr);
} else {
dbgln_if(DHCPV4_DEBUG, "Found adapter '{}' with mac {}, but it was down", name, mac);
ifnames_to_attempt_later.empend(name, mac_from_string(mac));
ifnames_to_attempt_later.empend(name, mac_from_string(mac), ipv4_addr);
}
});
@ -344,10 +345,8 @@ void DHCPv4Client::dhcp_discover(const InterfaceDescriptor& iface)
auto& dhcp_packet = builder.build();
// broadcast the discover request
if (!send(iface, dhcp_packet, this)) {
m_ifnames_for_later.append(iface);
if (!send(iface, dhcp_packet, this))
return;
}
m_ongoing_transactions.set(transaction_id, make<DHCPv4Transaction>(iface));
}
@ -373,9 +372,7 @@ void DHCPv4Client::dhcp_request(DHCPv4Transaction& transaction, const DHCPv4Pack
auto& dhcp_packet = builder.build();
// broadcast the "request" request
if (!send(iface, dhcp_packet, this)) {
m_ifnames_for_later.append(iface);
if (!send(iface, dhcp_packet, this))
return;
}
transaction.accepted_offer = true;
}