feat: add remote config and host metadata

Co-authored-by: Cursor <cursoragent@cursor.com>

internal/hostmeta/hostmeta.go

@@ -0,0 +1,55 @@
+package hostmeta
+
+import (
+	"net"
+	"os"
+	"sort"
+)
+
+func Hostname() (string, error) {
+	return os.Hostname()
+}
+
+func IPs() []string {
+	seen := make(map[string]struct{})
+	var ips []string
+
+	ifaces, err := net.Interfaces()
+	if err != nil {
+		return nil
+	}
+	for _, iface := range ifaces {
+		if iface.Flags&net.FlagUp == 0 || iface.Flags&net.FlagLoopback != 0 {
+			continue
+		}
+		addrs, err := iface.Addrs()
+		if err != nil {
+			continue
+		}
+		for _, addr := range addrs {
+			var ip net.IP
+			switch v := addr.(type) {
+			case *net.IPNet:
+				ip = v.IP
+			case *net.IPAddr:
+				ip = v.IP
+			default:
+				continue
+			}
+			if ip == nil || ip.IsLoopback() {
+				continue
+			}
+			if ip4 := ip.To4(); ip4 != nil {
+				ip = ip4
+			}
+			s := ip.String()
+			if _, ok := seen[s]; ok {
+				continue
+			}
+			seen[s] = struct{}{}
+			ips = append(ips, s)
+		}
+	}
+	sort.Strings(ips)
+	return ips
+}

internal/hostmeta/hostmeta_test.go

@@ -0,0 +1,19 @@
+package hostmeta
+
+import "testing"
+
+func TestHostnameNonEmpty(t *testing.T) {
+	h, err := Hostname()
+	if err != nil || h == "" {
+		t.Fatalf("hostname: %q err=%v", h, err)
+	}
+}
+
+func TestIPsSkipsLoopback(t *testing.T) {
+	ips := IPs()
+	for _, ip := range ips {
+		if ip == "127.0.0.1" || ip == "::1" {
+			t.Fatalf("loopback in ips: %v", ips)
+		}
+	}
+}