47 lines
1.7 KiB
Zig
47 lines
1.7 KiB
Zig
const std = @import("std");
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const c_ifaddrs = @cImport(@cInclude("ifaddrs.h"));
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const c_inet = @cImport(@cInclude("arpa/inet.h"));
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const c_net_if = @cImport(@cInclude("net/if.h"));
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const c_netinet_in = @cImport(@cInclude("netinet/in.h"));
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const c_socket = @cImport(@cInclude("sys/socket.h"));
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/// Struct representing Network informations (interface name - ipv4 address)
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pub const NetInfo = struct {
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interface_name: []u8,
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ipv4_addr: []u8,
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};
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pub fn getNetInfo(allocator: std.mem.Allocator) !std.array_list.Managed(NetInfo) {
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var net_info_list = std.array_list.Managed(NetInfo).init(allocator);
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var ifap: ?*c_ifaddrs.ifaddrs = null;
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if (c_ifaddrs.getifaddrs(&ifap) != 0) {
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return error.GetifaddrsFailed;
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}
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defer c_ifaddrs.freeifaddrs(ifap);
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var cur: ?*c_ifaddrs.ifaddrs = ifap;
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while (cur) |ifa| : (cur = ifa.ifa_next) {
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if (ifa.ifa_addr) |addr| {
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// Skips the loopback
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if ((ifa.ifa_flags & c_net_if.IFF_LOOPBACK) != 0) continue;
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const sockaddr_ptr = @as(*const c_socket.sockaddr, @ptrCast(@alignCast(addr)));
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if (sockaddr_ptr.sa_family != c_inet.AF_INET) continue;
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var addr_in = @as(*const c_netinet_in.sockaddr_in, @ptrCast(@alignCast(sockaddr_ptr)));
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var ip_buf: [c_inet.INET_ADDRSTRLEN]u8 = undefined;
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const ip_str = c_inet.inet_ntop(c_inet.AF_INET, &addr_in.sin_addr, &ip_buf, c_inet.INET_ADDRSTRLEN);
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if (ip_str) |ip| {
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try net_info_list.append(NetInfo{
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.interface_name = try allocator.dupe(u8, std.mem.span(ifa.ifa_name)),
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.ipv4_addr = try allocator.dupe(u8, std.mem.span(ip)),
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});
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}
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}
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}
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return net_info_list;
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}
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