feat(linux): add net info

src/linux/linux.zig

@@ -2,6 +2,11 @@ const std = @import("std");
 const c_sysinfo = @cImport(@cInclude("sys/sysinfo.h"));
 const c_unistd = @cImport(@cInclude("unistd.h"));
 const c_utsname = @cImport(@cInclude("sys/utsname.h"));
+const c_ifaddrs = @cImport(@cInclude("ifaddrs.h"));
+const c_inet = @cImport(@cInclude("arpa/inet.h"));
+const c_net_if = @cImport(@cInclude("net/if.h"));
+const c_netinet_in = @cImport(@cInclude("netinet/in.h"));
+const c_socket = @cImport(@cInclude("sys/socket.h"));
 
 /// Structure representing system uptime in days, hours, and minutes.
 pub const SystemUptime = struct {
@@ -27,6 +32,11 @@ pub const KernelInfo = struct {
     kernel_release: []u8,
 };
 
+pub const NetInfo = struct {
+    interface_name: []u8,
+    ipv4_addr: []u8,
+};
+
 pub fn getUsername(allocator: std.mem.Allocator) ![]u8 {
     const username = try std.process.getEnvVarOwned(allocator, "USER");
     return username;
@@ -232,3 +242,37 @@ pub fn getOsInfo(allocator: std.mem.Allocator) ![]u8 {
 
     return try allocator.dupe(u8, pretty_name orelse "Unknown");
 }
+
+pub fn getNetInfo(allocator: std.mem.Allocator) !std.ArrayList(NetInfo) {
+    var net_info_list = std.ArrayList(NetInfo).init(allocator);
+
+    var ifap: ?*c_ifaddrs.ifaddrs = null;
+    if (c_ifaddrs.getifaddrs(&ifap) != 0) {
+        return error.GetifaddrsFailed;
+    }
+    defer c_ifaddrs.freeifaddrs(ifap);
+
+    var cur: ?*c_ifaddrs.ifaddrs = ifap;
+    while (cur) |ifa| : (cur = ifa.ifa_next) {
+        if (ifa.ifa_addr) |addr| {
+            // Skips the loopback
+            if ((ifa.ifa_flags & c_net_if.IFF_LOOPBACK) != 0) continue;
+
+            const sockaddr_ptr = @as(*const c_socket.sockaddr, @ptrCast(@alignCast(addr)));
+
+            if (sockaddr_ptr.sa_family != c_inet.AF_INET) continue;
+
+            var addr_in = @as(*const c_netinet_in.sockaddr_in, @ptrCast(@alignCast(sockaddr_ptr)));
+            var ip_buf: [c_inet.INET_ADDRSTRLEN]u8 = undefined;
+            const ip_str = c_inet.inet_ntop(c_inet.AF_INET, &addr_in.sin_addr, &ip_buf, c_inet.INET_ADDRSTRLEN);
+            if (ip_str) |ip| {
+                try net_info_list.append(NetInfo{
+                    .interface_name = try allocator.dupe(u8, std.mem.span(ifa.ifa_name)),
+                    .ipv4_addr = try allocator.dupe(u8, std.mem.span(ip)),
+                });
+            }
+        }
+    }
+
+    return net_info_list;
+}