From da63099262e71310b7c8b6af3ba85214b430ef72 Mon Sep 17 00:00:00 2001
From: Arthur de Jong <arthur@arthurdejong.org>
Date: Sat, 26 Jan 2008 10:49:18 +0000
Subject: move code to get information from socket peer to the compat directory
 because it is very platform specific

git-svn-id: http://arthurdejong.org/svn/nss-pam-ldapd/nss-ldapd@565 ef36b2f9-881f-0410-afb5-c4e39611909c
---
 compat/getpeercred.c | 93 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 93 insertions(+)
 create mode 100644 compat/getpeercred.c

(limited to 'compat/getpeercred.c')

diff --git a/compat/getpeercred.c b/compat/getpeercred.c
new file mode 100644
index 0000000..101a492
--- /dev/null
+++ b/compat/getpeercred.c
@@ -0,0 +1,93 @@
+/*
+   getpeercred.h - function for determining information about the
+                   other end of a unix socket
+   This file is part of the nss-ldapd library.
+
+   Copyright (C) 2008 Arthur de Jong
+
+   This library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   This library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with this library; if not, write to the Free Software
+   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+   02110-1301 USA
+*/
+
+#include "config.h"
+
+#include <stdlib.h>
+#include <unistd.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+#ifdef HAVE_SYS_UCRED_H
+#include <sys/ucred.h>
+#endif /* HAVE SYS_UCRED_H */
+#include <errno.h>
+
+#include "getpeercred.h"
+
+int getpeercred(int sock,uid_t *uid,gid_t *gid,pid_t *pid)
+{
+#if defined(SO_PEERCRED)
+  socklen_t l;
+  struct ucred cred;
+  /* initialize client information (in case getsockopt() breaks) */
+  cred.pid=(pid_t)0;
+  cred.uid=(uid_t)-1;
+  cred.gid=(gid_t)-1;
+  /* look up process information from peer */
+  l=(socklen_t)sizeof(struct ucred);
+  if (getsockopt(sock,SOL_SOCKET,SO_PEERCRED,&cred,&l) < 0)
+    return -1; /* errno already set */
+  /* return the data */
+  if (uid!=NULL) *uid=cred.uid;
+  if (gid!=NULL) *gid=cred.gid;
+  if (pid!=NULL) *pid=cred.pid;
+  return 0;
+#elif defined(LOCAL_PEERCRED)
+  socklen_t l;
+  struct xucred cred;
+  /* initialize client information (in case getsockopt() breaks) */
+  cred.pid=(pid_t)0;
+  cred.uid=(uid_t)-1;
+  cred.gid=(gid_t)-1;
+  /* look up process information from peer */
+  l=(socklen_t)sizeof(struct xucred);
+  if (getsockopt(sock,SOL_SOCKET,LOCAL_PEERCRED,&cred,&l) < 0)
+    return -1; /* errno already set */
+  if (cred.cr_version!=XUCRED_VERSION)
+  {
+    errno=EINVAL;
+    return -1;
+  }
+  /* return the data */
+  if (uid!=NULL) *uid=cred.uid;
+  if (gid!=NULL) *gid=cred.gid;
+  if (pid!=NULL) *pid=cred.pid;
+  return 0;
+#elif defined(HAVE_GETPEEREID)
+  uid_t tuid;
+  gid_t tgid;
+  if (uid==NULL) uid=&tuid;
+  if (gid==NULL) gid=&tguid;
+  if (getpeereid(sock,uid,gid))
+    return -1;
+  /* return the data */
+  if (uid!=NULL) *uid=cred.uid;
+  if (gid!=NULL) *gid=cred.gid;
+  if (pid!=NULL) *pid=-1; /* we return a -1 pid because we have no usable pid */
+  return 0;
+#else
+  /* nothing found that is supported */
+  errno=ENOSYS;
+  return -1;
+#endif
+}
-- 
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