99 lines
3.1 KiB
Diff
99 lines
3.1 KiB
Diff
From aad0bde0b5aa6ccf2714f43676d4941f820c6283 Mon Sep 17 00:00:00 2001
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From: Kamil Dudka <kdudka@redhat.com>
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Date: Fri, 22 Jan 2010 15:17:19 +0100
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Subject: [PATCH] who --mesg (-T) can use a more accurate test for TTY writability
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Enabled when coreutils is configured with --with-tty-group.
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Based on a patch written by Piotr Gackiewicz. Details at
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http://bugzilla.redhat.com/454261
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* src/who.c (is_tty_writable): A new function returning true if a TTY
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device is writable by the group. Additionally it checks the group to be
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the same as TTY_GROUP_NAME when compiled with --with-tty-group.
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* m4/jm-macros.m4: Introduce a new configure option --with-tty-group.
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---
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m4/jm-macros.m4 | 19 +++++++++++++++++++
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src/who.c | 22 +++++++++++++++++++++-
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2 files changed, 40 insertions(+), 1 deletions(-)
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diff --git a/m4/jm-macros.m4 b/m4/jm-macros.m4
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index 2713827..0ddbf2f 100644
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--- a/m4/jm-macros.m4
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+++ b/m4/jm-macros.m4
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@@ -144,6 +144,25 @@ AC_DEFUN([coreutils_MACROS],
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])
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AC_REQUIRE([AM_LANGINFO_CODESET])
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+
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+ # Accept configure options: --with-tty-group[=GROUP], --without-tty-group
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+ # You can determine the group of a TTY via 'stat --format %G /dev/tty'
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+ # Omitting this option is equivalent to using --without-tty-group.
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+ AC_ARG_WITH([tty-group],
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+ AS_HELP_STRING([--with-tty-group[[[=NAME]]]],
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+ [group used by system for TTYs, "tty" when not specified]
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+ [ (default: do not rely on any group used for TTYs)]),
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+ [tty_group_name=$withval],
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+ [tty_group_name=no])
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+
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+ if test "x$tty_group_name" != xno; then
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+ if test "x$tty_group_name" = xyes; then
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+ tty_group_name=tty
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+ fi
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+ AC_MSG_NOTICE([TTY group used by system set to "$tty_group_name"])
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+ AC_DEFINE_UNQUOTED([TTY_GROUP_NAME], ["$tty_group_name"],
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+ [group used by system for TTYs])
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+ fi
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])
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AC_DEFUN([gl_CHECK_ALL_HEADERS],
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diff --git a/src/who.c b/src/who.c
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index f71db3b..4859694 100644
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--- a/src/who.c
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+++ b/src/who.c
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@@ -37,6 +37,10 @@
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#include "hard-locale.h"
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#include "quote.h"
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+#ifdef TTY_GROUP_NAME
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+# include <grp.h>
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+#endif
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+
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/* The official name of this program (e.g., no `g' prefix). */
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#define PROGRAM_NAME "who"
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@@ -308,6 +312,22 @@ print_line (int userlen, const char *user, const char state,
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free (x_exitstr);
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}
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+/* Return true if a terminal device given as PSTAT allows other users
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+ to send messages to; false otherwise */
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+static bool
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+is_tty_writable (struct stat const *pstat)
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+{
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+#ifdef TTY_GROUP_NAME
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+ /* Ensure the group of the TTY device matches TTY_GROUP_NAME, more info at
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+ https://bugzilla.redhat.com/454261 */
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+ struct group *ttygr = getgrnam (TTY_GROUP_NAME);
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+ if (!ttygr || (pstat->st_gid != ttygr->gr_gid))
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+ return false;
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+#endif
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+
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+ return pstat->st_mode & S_IWGRP;
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+}
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+
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/* Send properly parsed USER_PROCESS info to print_line. The most
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recent boot time is BOOTTIME. */
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static void
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@@ -346,7 +366,7 @@ print_user (const STRUCT_UTMP *utmp_ent, time_t boottime)
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if (stat (line, &stats) == 0)
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{
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- mesg = (stats.st_mode & S_IWGRP) ? '+' : '-';
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+ mesg = is_tty_writable (&stats) ? '+' : '-';
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last_change = stats.st_atime;
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}
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else
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--
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1.6.5
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