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64 lines
2.0 KiB
Zig
64 lines
2.0 KiB
Zig
const std = @import("std");
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const mem = std.mem;
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const net = std.net;
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const posix = std.posix;
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pub const wpa = @import("wpa.zig");
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const IFF_UP = 1 << 0; //0b1;
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const IFF_LOOPBACK = 1 << 3; //0b1000;
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const ifaddrs = extern struct {
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next: ?*ifaddrs,
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name: [*:0]const u8,
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flags: c_uint, // see IFF_xxx SIOCGIFFLAGS in netdevice(7)
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addr: ?*std.posix.sockaddr,
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netmask: ?*std.posix.sockaddr,
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ifu: extern union {
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broad: *posix.sockaddr, // flags & IFF_BROADCAST
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dst: *posix.sockaddr, // flags & IFF_POINTOPOINT
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},
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data: ?*anyopaque,
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};
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extern "c" fn getifaddrs(ptrp: **ifaddrs) c_int;
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extern "c" fn freeifaddrs(ptr: *ifaddrs) void;
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/// retrieves a list of all public IP addresses assigned to the network interfaces,
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/// optionally filtering by the interface name.
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/// caller owns the returned value.
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pub fn pubAddresses(allocator: mem.Allocator, ifname: ?[]const u8) ![]net.Address {
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var res: *ifaddrs = undefined;
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if (getifaddrs(&res) != 0) {
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return error.Getifaddrs;
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}
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defer freeifaddrs(res);
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var list = std.ArrayList(net.Address).init(allocator);
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var it: ?*ifaddrs = res;
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while (it) |ifa| : (it = ifa.next) {
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const sa: *posix.sockaddr = ifa.addr orelse continue;
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if (sa.family != posix.AF.INET and sa.family != posix.AF.INET6) {
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// not an IP address
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continue;
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}
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if (ifa.flags & IFF_UP == 0 or ifa.flags & IFF_LOOPBACK != 0) {
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// skip loopbacks and those which are not "up"
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continue;
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}
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const ipaddr = net.Address.initPosix(@alignCast(sa)); // initPosix makes a copy
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if (ipaddr.any.family == posix.AF.INET6 and ipaddr.in6.sa.scope_id > 0) {
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// want only global, with 0 scope
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// non-zero scopes make sense for link-local addr only.
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continue;
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}
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if (ifname) |name| {
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if (!mem.eql(u8, name, mem.sliceTo(ifa.name, 0))) {
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continue;
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}
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}
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try list.append(ipaddr);
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}
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return list.toOwnedSlice();
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}
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