fix: FreeBSD session activation

This is based heavily on the work of Jesper Schmitz Mouridsen in:
https://bugs.freebsd.org/bugzilla/attachment.cgi?id=179399&action=diff
from:
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=202269
Fixes: #85

configure.ac

@@ -71,7 +71,7 @@ AC_CHECK_HEADERS([unistd.h paths.h sys/vt.h sys/consio.h fcntl.h limits.h \
                   sys/wait.h sys/resource.h sys/mount.h sys/param.h ftw.h \
 		  sys/sysmacros.h sys/types.h libudev.h linux/input.h \
 		  sys/mkdev.h devattr.h sys/kd.h sys/kbio.h libprop/proplib.h \
-		  linux/kd.h])
+		  linux/kd.h sys/queue.h sys/stat.h sys/fcntl.h])
 
 AC_CHECK_FUNCS([getpeerucred getpeereid memset setenv strchr strdup \
                 strerror strrchr strspn strstr strtol strtoul uname \
@@ -203,6 +203,11 @@ case "$host" in
         if test "x$have_kvm" = "xyes"; then
                 KVM_LIBS="-lkvm"
         fi
+	AC_CHECK_LIB(procstat, procstat_open_sysctl, have_procstat=yes,
+                AC_MSG_WARN([Unable to find libprocstat which is used on FreeBSD]))
+	if test "x$have_procstat" = "xyes"; then
+                KVM_LIBS="${KVM_LIBS} -lprocstat"
+        fi
         ;;
         *-*-netbsd*)
         CK_BACKEND="netbsd"

src/ck-sysdeps-freebsd.c

@@ -128,7 +128,7 @@ ck_process_stat_get_tty (CkProcessStat *stat)
 {
         g_return_val_if_fail (stat != NULL, NULL);
 
-        return g_strdup (stat->tty_text);
+        return g_strdup_printf ("/dev/%s", stat->tty_text);
 }
 
 static gboolean

src/ck-sysdeps-unix.c

@@ -57,6 +57,14 @@
 #include <ucred.h>
 #endif
 
+#ifdef __FreeBSD__
+#include <kvm.h>
+#include <sys/param.h>
+#include <sys/sysctl.h>
+#include <sys/user.h>
+#include <paths.h>
+#endif
+
 #ifdef HAVE_UNISTD_H
 #include <unistd.h>
 #endif
@@ -134,13 +142,34 @@ ck_get_socket_peer_credentials   (int      socket_fd,
         }
 #elif defined(HAVE_GETPEEREID)
 	gid_t dummy;
+        char errbuf[_POSIX2_LINE_MAX];
+        int cnt = 0;
+        kvm_t* kd;
+        struct kinfo_proc * prc;
 
         if (getpeereid (socket_fd, &uid_read, &dummy) == 0) {
                 ret = TRUE;
         } else {
                 g_warning ("Failed to getpeereid() credentials: %s\n",
                            g_strerror (errno));
         }
+#ifdef __FreeBSD__
+        kd = kvm_openfiles (NULL, _PATH_DEVNULL, NULL, O_RDONLY, errbuf);
+        if (kd == NULL) {
+                g_warning ("kvm_openfiles failed: %s", errbuf);
+                return FALSE;
+        }
+
+        prc = kvm_getprocs (kd, KERN_PROC_UID, uid_read, &cnt);
+        for (int i = 0; i < cnt; i++) {
+                if(strncmp (prc[i].ki_comm, "Xorg", 4) == 0) {
+                        pid_read = prc[i].ki_pid;
+                        break;
+                }
+        }
+
+        kvm_close(kd);
+#endif /* __FreeBSD__ */
 #else /* !SO_PEERCRED && !HAVE_GETPEERUCRED */
         g_warning ("Socket credentials not supported on this OS\n");
 #endif
@@ -238,15 +267,6 @@ ck_get_a_console_fd (void)
 
         fd = -1;
 
-#ifdef __FreeBSD__
-        /* On FreeBSD, try /dev/consolectl first as this will survive
-         * /etc/ttys initialization. */
-        fd = ck_open_a_console ("/dev/consolectl");
-        if (fd >= 0) {
-                goto done;
-        }
-#endif
-
 #ifdef __sun
         /* On Solaris, first try Sun VT device. */
         fd = ck_open_a_console ("/dev/vt/active");

tools/ck-get-x11-display-device.c

@@ -28,13 +28,88 @@
 #include <libintl.h>
 #include <locale.h>
 
+#ifdef HAVE_KVM_H
+#include <kvm.h>
+#endif
+
+#ifdef HAVE_SYS_QUEUE_H
+#include <sys/queue.h>
+#endif
+
+#ifdef HAVE_SYS_FCNTL_H
+#include <sys/fcntl.h>
+#endif
+#ifdef HAVE_SYS_USER_H
+#include <sys/user.h>
+#endif
+#ifdef HAVE_SYS_PARAM_H
+#include <sys/param.h>
+#endif
+#ifdef HAVE_SYS_SYSCTL_H
+#include <sys/sysctl.h>
+#endif
+#ifdef HAVE_SYS_STAT_H
+#include <sys/stat.h>
+#endif
+#ifdef HAVE_LIMITS_H
+#include <limits.h>
+#endif
+
 #include <X11/Xlib.h>
 #include <X11/Xatom.h>
 #include <glib.h>
 #include <glib/gi18n.h>
 
 #include "ck-sysdeps.h"
 
+#ifdef __FreeBSD__
+#include <libprocstat.h>
+
+
+static char *
+get_tty_for_pid (int pid)
+{
+        gchar *device = NULL;
+        gboolean res;
+        char errstr[_POSIX2_LINE_MAX];
+        int cnt = 0;
+        struct vnstat vn;
+        struct filestat_list *head;
+        struct filestat *fst;
+        kvm_t* kd;
+        struct kinfo_proc * prc;
+        struct procstat *procstat;
+
+        kd = kvm_openfiles (NULL, "/dev/null", NULL, O_RDONLY, errstr);
+        prc = kvm_getprocs (kd, KERN_PROC_PID, pid, &cnt);
+        procstat = procstat_open_sysctl ();
+
+        for (int i = 0; i < cnt; i++) {
+                head = procstat_getfiles (procstat,&prc[i], 0);
+
+                STAILQ_FOREACH (fst, head, next) {
+                        if (fst->fs_type == PS_FST_TYPE_VNODE) {
+                                procstat_get_vnode_info (procstat, fst, &vn, NULL);
+
+                                if (vn.vn_type == PS_FST_VTYPE_VCHR) {
+                                        char *ctty = devname( prc[i].ki_tdev,S_IFCHR);
+                                        const char * pre = "ttyv";
+
+                                        if(strncmp (pre, vn.vn_devname, strlen (pre)) == 0 && strncmp (vn.vn_devname, ctty, strlen(ctty)) != 0) {
+                                                device = g_strdup_printf ("/dev/%s", vn.vn_devname);
+                                                procstat_freefiles (procstat, head);
+                                                res = TRUE;
+                                                return device;
+                                        }
+                                }
+                        }
+                }
+        }
+
+        procstat_freefiles(procstat, head);
+        return device;
+}
+#else /* __FreeBSD__ */
 static char *
 get_tty_for_pid (int pid)
 {
@@ -58,6 +133,7 @@ get_tty_for_pid (int pid)
         ck_process_stat_free (xorg_stat);
         return device;
 }
+#endif /* __FreeBSD__ */
 
 static Display *
 display_init (const char *display_name)