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#+build freebsd
package net
/*
Package net implements cross-platform Berkeley Sockets, DNS resolution and associated procedures.
For other protocols and their features, see subdirectories of this package.
*/
/*
Copyright 2022 Tetralux <tetraluxonpc@gmail.com>
Copyright 2022 Colin Davidson <colrdavidson@gmail.com>
Copyright 2022 Jeroen van Rijn <nom@duclavier.com>.
Copyright 2024 Feoramund <rune@swevencraft.org>.
Made available under Odin's BSD-3 license.
List of contributors:
Tetralux: Initial implementation
Colin Davidson: Linux platform code, OSX platform code, Odin-native DNS resolver
Jeroen van Rijn: Cross platform unification, code style, documentation
Feoramund: FreeBSD platform code
*/
import "core:c"
import "core:strings"
import "core:sys/freebsd"
@(private)
_enumerate_interfaces :: proc(allocator := context.allocator) -> (interfaces: []Network_Interface, err: Interfaces_Error) {
// This is a simplified implementation of `getifaddrs` from the FreeBSD
// libc using only Odin and syscalls.
context.allocator = allocator
mib := [6]freebsd.MIB_Identifier {
.CTL_NET,
cast(freebsd.MIB_Identifier)freebsd.Protocol_Family.ROUTE,
freebsd.MIB_Identifier(0),
freebsd.MIB_Identifier(0),
.NET_RT_IFLISTL,
freebsd.MIB_Identifier(0),
}
// Figure out how much space we need.
needed: c.size_t = ---
errno := freebsd.sysctl(mib[:], nil, &needed, nil, 0)
if errno != nil {
return nil, .Unable_To_Enumerate_Network_Interfaces
}
// Allocate and get the entries.
buf, alloc_err := make([]byte, needed)
if alloc_err != nil {
return nil, .Allocation_Failure
}
defer delete(buf)
errno = freebsd.sysctl(mib[:], &buf[0], &needed, nil, 0)
if errno != nil {
return nil, .Unable_To_Enumerate_Network_Interfaces
}
// Build the interfaces with each message.
if_builder: [dynamic]Network_Interface
for message_pointer: uintptr = 0; message_pointer < cast(uintptr)needed; /**/ {
rtm := cast(^freebsd.Route_Message_Header)&buf[message_pointer]
if rtm.version != freebsd.RTM_VERSION {
continue
}
#partial switch rtm.type {
case .IFINFO:
ifm := cast(^freebsd.Interface_Message_Header_Len)&buf[message_pointer]
if .IFP not_in ifm.addrs {
// No name available.
break
}
dl := cast(^freebsd.Socket_Address_Data_Link)&buf[message_pointer + cast(uintptr)ifm.len]
if_data := cast(^freebsd.Interface_Data)&buf[message_pointer + cast(uintptr)ifm.data_off]
// This is done this way so the different message types can
// dynamically build a `Network_Interface`.
resize(&if_builder, max(len(if_builder), 1 + cast(int)ifm.index))
interface := if_builder[ifm.index]
interface.adapter_name = strings.clone_from_bytes(dl.data[0:dl.nlen])
interface.mtu = if_data.mtu
switch if_data.link_state {
case .UNKNOWN: /* Do nothing; the default value is valid. */
case .UP: interface.link.state |= { .Up }
case .DOWN: interface.link.state |= { .Down }
}
// TODO: Uncertain if these are equivalent:
// interface.link.transmit_speed = if_data.baudrate
// interface.link.receive_speed = if_data.baudrate
if dl.type == .LOOP {
interface.link.state |= { .Loopback }
} else {
interface.physical_address = physical_address_to_string(dl.data[dl.nlen:][:6])
}
if_builder[ifm.index] = interface
case .NEWADDR:
RTA_MASKS :: freebsd.Route_Address_Flags { .IFA, .NETMASK }
ifam := cast(^freebsd.Interface_Address_Message_Header_Len)&buf[message_pointer]
if ifam.addrs & RTA_MASKS == {} {
break
}
resize(&if_builder, max(len(if_builder), 1 + cast(int)ifam.index))
interface := if_builder[ifam.index]
address_pointer := message_pointer + cast(uintptr)ifam.len
lease: Lease
address_set: bool
for address_type in ifam.addrs {
ptr := cast(^freebsd.Socket_Address_Basic)&buf[address_pointer]
#partial switch address_type {
case .IFA:
#partial switch ptr.family {
case .INET:
real := cast(^freebsd.Socket_Address_Internet)ptr
lease.address = cast(IP4_Address)real.addr.addr8
address_set = true
case .INET6:
real := cast(^freebsd.Socket_Address_Internet6)ptr
lease.address = cast(IP6_Address)real.addr.addr16
address_set = true
}
case .NETMASK:
#partial switch ptr.family {
case .INET:
real := cast(^freebsd.Socket_Address_Internet)ptr
lease.netmask = cast(Netmask)cast(IP4_Address)real.addr.addr8
case .INET6:
real := cast(^freebsd.Socket_Address_Internet6)ptr
lease.netmask = cast(Netmask)cast(IP6_Address)real.addr.addr16
}
}
SALIGN : u8 : size_of(c.long) - 1
address_advance: uintptr = ---
if ptr.len > 0 {
address_advance = cast(uintptr)((ptr.len + SALIGN) & ~SALIGN)
} else {
address_advance = cast(uintptr)(SALIGN + 1)
}
address_pointer += address_advance
}
if address_set {
append(&interface.unicast, lease)
}
if_builder[ifam.index] = interface
}
message_pointer += cast(uintptr)rtm.msglen
}
// Remove any interfaces that were allocated but had no name.
#no_bounds_check for i := len(if_builder) - 1; i >= 0; i -= 1 {
if len(if_builder[i].adapter_name) == 0 {
ordered_remove(&if_builder, i)
}
}
return if_builder[:], nil
}
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