From c0c74f8064392598cd29401142804fcc241841ed Mon Sep 17 00:00:00 2001
From: William Jon McCann <mccann@jhu.edu>
Date: Fri, 17 Aug 2007 10:52:19 -0400
Subject: a few fixes for peer cred stuff

---
 src/ck-sysdeps-unix.c             | 26 ++++++++++++++++++++------
 tools/ck-get-x11-display-device.c | 13 ++++++-------
 tools/ck-get-x11-server-pid.c     |  4 +++-
 3 files changed, 29 insertions(+), 14 deletions(-)

diff --git a/src/ck-sysdeps-unix.c b/src/ck-sysdeps-unix.c
index 6520105..aadca48 100644
--- a/src/ck-sysdeps-unix.c
+++ b/src/ck-sysdeps-unix.c
@@ -27,12 +27,16 @@
 #include <string.h>
 #include <sys/types.h>
 #include <sys/stat.h>
+#include <sys/socket.h>
+#include <errno.h>
+
 #ifdef HAVE_GETPEERUCRED
 #include <ucred.h>
 #endif
 
 #include "ck-sysdeps.h"
 
+/* Adapted from dbus-sysdeps-unix.c:_dbus_read_credentials_socket() */
 gboolean
 ck_get_socket_peer_credentials   (int      socket_fd,
                                   pid_t   *pid,
@@ -43,17 +47,17 @@ ck_get_socket_peer_credentials   (int      socket_fd,
         uid_t    uid_read;
         pid_t    pid_read;
 
-        uid_read = 0;
-        pid_read = 0;
+        pid_read = -1;
+        uid_read = -1;
         ret = FALSE;
 
 #ifdef SO_PEERCRED
         struct ucred cr;
-        socklen_t cr_len;
+        socklen_t    cr_len;
 
         cr_len = sizeof (cr);
 
-        if (getsockopt (fd, SOL_SOCKET, SO_PEERCRED, &cr, &cr_len) == 0 && cr_len == sizeof (cr)) {
+        if (getsockopt (socket_fd, SOL_SOCKET, SO_PEERCRED, &cr, &cr_len) == 0 && cr_len == sizeof (cr)) {
                 pid_read = cr.pid;
                 uid_read = cr.uid;
                 ret = TRUE;
@@ -64,8 +68,10 @@ ck_get_socket_peer_credentials   (int      socket_fd,
                            g_strerror (errno));
         }
 #elif defined(HAVE_GETPEERUCRED)
-        ucred_t * ucred = NULL;
-        if (getpeerucred (client_fd, &ucred) == 0) {
+        ucred_t *ucred;
+
+        ucred = NULL;
+        if (getpeerucred (socket_fd, &ucred) == 0) {
                 pid_read = ucred_getpid (ucred);
                 uid_read = ucred_geteuid (ucred);
                 ret = TRUE;
@@ -80,5 +86,13 @@ ck_get_socket_peer_credentials   (int      socket_fd,
         g_warning ("Socket credentials not supported on this OS\n");
 #endif
 
+        if (pid != NULL) {
+                *pid = pid_read;
+        }
+
+        if (uid != NULL) {
+                *uid = uid_read;
+        }
+
         return ret;
 }
diff --git a/tools/ck-get-x11-display-device.c b/tools/ck-get-x11-display-device.c
index 723d239..b349cc7 100644
--- a/tools/ck-get-x11-display-device.c
+++ b/tools/ck-get-x11-display-device.c
@@ -25,9 +25,6 @@
 
 #include <stdlib.h>
 #include <stdio.h>
-#include <errno.h>
-#include <sys/types.h>
-#include <sys/socket.h>
 
 #include <X11/Xlib.h>
 #include <glib.h>
@@ -116,10 +113,12 @@ main (int    argc,
                 ret = 0;
                 res = ck_get_socket_peer_credentials (fd, &pid, NULL, NULL);
                 if (res) {
-                        device = get_tty_for_pid (pid);
-                        if (device != NULL) {
-                                printf ("%s\n", device);
-                                g_free (device);
+                        if (pid > 0) {
+                                device = get_tty_for_pid (pid);
+                                if (device != NULL) {
+                                        printf ("%s\n", device);
+                                        g_free (device);
+                                }
                         }
                 }
         }
diff --git a/tools/ck-get-x11-server-pid.c b/tools/ck-get-x11-server-pid.c
index eedb9af..3324164 100644
--- a/tools/ck-get-x11-server-pid.c
+++ b/tools/ck-get-x11-server-pid.c
@@ -77,7 +77,9 @@ main (int    argc,
                 ret = 0;
                 res = ck_get_socket_peer_credentials (fd, &pid, NULL, NULL);
                 if (res) {
-                        printf ("%u\n", pid);
+                        if (pid > 0) {
+                                printf ("%d\n", pid);
+                        }
                 }
         }
 
-- 
cgit