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#+build linux, darwin, 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 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:strings"
@(private)
_get_dns_records_os :: proc(hostname: string, type: DNS_Record_Type, allocator := context.allocator) -> (records: []DNS_Record, err: DNS_Error) {
context.allocator = allocator
if type != .SRV {
// NOTE(tetra): 'hostname' can contain underscores when querying SRV records
ok := validate_hostname(hostname)
if !ok {
return nil, .Invalid_Hostname_Error
}
}
name_servers, resolve_ok := load_resolv_conf(dns_configuration.resolv_conf)
defer delete(name_servers)
if !resolve_ok {
return nil, .Invalid_Resolv_Config_Error
}
if len(name_servers) == 0 {
return
}
hosts, hosts_ok := load_hosts(dns_configuration.hosts_file)
defer delete(hosts)
if !hosts_ok {
return nil, .Invalid_Hosts_Config_Error
}
host_overrides := make([dynamic]DNS_Record)
for host in hosts {
if strings.compare(host.name, hostname) != 0 {
continue
}
if type == .IP4 && family_from_address(host.addr) == .IP4 {
record := DNS_Record_IP4{
base = {
record_name = strings.clone(hostname),
ttl_seconds = 0,
},
address = host.addr.(IP4_Address),
}
append(&host_overrides, record)
} else if type == .IP6 && family_from_address(host.addr) == .IP6 {
record := DNS_Record_IP6{
base = {
record_name = strings.clone(hostname),
ttl_seconds = 0,
},
address = host.addr.(IP6_Address),
}
append(&host_overrides, record)
}
}
if len(host_overrides) > 0 {
return host_overrides[:], nil
}
return get_dns_records_from_nameservers(hostname, type, name_servers, host_overrides[:])
}
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