1 files changed, 57 insertions, 0 deletions
diff --git a/compat/getpeereid.c b/compat/getpeereid.c
new file mode 100644
index 00000000..b79f420a
--- /dev/null
+++ b/compat/getpeereid.c
@@ -0,0 +1,57 @@
+/*
+ * Copyright (c) 2022 Nicholas Marriott <nicholas.marriott@gmail.com>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
+ * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
+ * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <sys/types.h>
+#include <sys/socket.h>
+
+#include <stdio.h>
+#include <unistd.h>
+
+#ifdef HAVE_UCRED_H
+#include <ucred.h>
+#endif
+
+#include "compat.h"
+
+int
+getpeereid(int s, uid_t *uid, gid_t *gid)
+{
+#ifdef HAVE_SO_PEERCRED
+	struct ucred	uc;
+	int		len = sizeof uc;
+
+	if (getsockopt(s, SOL_SOCKET, SO_PEERCRED, &uc, &len) == -1)
+		return (-1);
+	*uid = uc.uid;
+	*gid = uc.gid;
+	return (0);
+#elif defined(HAVE_GETPEERUCRED)
+        ucred_t *ucred = NULL;
+
+        if (getpeerucred(s, &ucred) == -1)
+                return (-1);
+        if ((*uid = ucred_geteuid(ucred)) == -1)
+                return (-1);
+        if ((*gid = ucred_getrgid(ucred)) == -1)
+                return (-1);
+        ucred_free(ucred);
+        return (0);
+#else
+	*uid = geteuid();
+	*gid = getegid();
+	return (0);
+#endif
+}