svc/tripe-ifup.in: Trim prefix length from IPv6 address used as gateway.

[tripe] / common / util.c

diff --git a/common/util.c b/common/util.c
index 92b9853d2cb789e3e7fdd0ace0ec2adef7d0a190..78358b31c2c42ed5645c38af7e69b33da80bcb23 100644 (file)
--- a/common/util.c
+++ b/common/util.c
@@ -137,7 +137,9 @@ gid_t u_getgroup(const char *name)
 
 void u_setugid(uid_t u, gid_t g)
 {
-  if (g != (gid_t)-1) {
+  uid_t cu = geteuid();
+
+  if (cu == 0 && g != (gid_t)-1) {
     if (setgid(g) || (getuid() == 0 && setgroups(1, &g))) {
       die(EXIT_FAILURE, "couldn't setgid to %u: %s",
          (unsigned)g, strerror(errno));