1 files changed, 68 insertions, 0 deletions
diff --git a/src/libstddjb/getpeereid.c b/src/libstddjb/getpeereid.c
new file mode 100644
index 0000000..bf70aca
--- /dev/null
+++ b/src/libstddjb/getpeereid.c
@@ -0,0 +1,68 @@
+/* ISC license. */
+
+#include <skalibs/sysdeps.h>
+
+#ifdef SKALIBS_HASGETPEEREID
+/* syscall exists - do nothing */
+
+#else
+
+#ifdef SKALIBS_HASSOPEERCRED
+/* implementation with SO_PEERCRED */
+
+#include <skalibs/nonposix.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+#include <skalibs/getpeereid.h>
+
+int getpeereid (int s, uid_t *u, gid_t *g)
+{
+  struct ucred blah ;
+  unsigned int len = sizeof(blah) ;
+
+  if (getsockopt(s, SOL_SOCKET, SO_PEERCRED, &blah, &len) == -1)
+    return -1 ;
+  *u = blah.uid ;
+  *g = blah.gid ;
+  return 0 ;
+}
+
+#else
+
+#ifdef SKALIBS_HASGETPEERUCRED
+/* implementation with getpeerucred() */
+
+#include <skalibs/nonposix.h>
+#include <sys/types.h>
+#include <ucred.h>
+
+int getpeereid (int s, uid_t *u, gid_t *g)
+{
+  ucred_t *cred ;
+  if (getpeerucred(s, &cred) == -1) return -1 ;
+  *u = ucred_geteuid(cred) ;
+  *g = ucred_getegid(cred) ;
+  ucred_free(cred) ;
+  return 0 ;
+}
+
+#else
+
+/* can't find a real implementation, make a stub */
+
+#include <sys/types.h>
+#include <errno.h>
+#include <skalibs/getpeereid.h>
+
+int getpeereid (int s, uid_t *uid, gid_t *gid)
+{
+  (void)s ;
+  *uid = *gid = -1 ;
+  errno = ENOSYS ;
+  return -1 ;
+}
+
+#endif
+#endif
+#endif