Bump to version 1.22.1

[platform/upstream/busybox.git] / miscutils / wall.c

diff --git a/miscutils/wall.c b/miscutils/wall.c
index eecfc16..bb709ee 100644 (file)
--- a/miscutils/wall.c
+++ b/miscutils/wall.c
@@ -6,16 +6,43 @@
  * Licensed under GPLv2 or later, see file LICENSE in this source tree.
  */
 
+//config:config WALL
+//config:      bool "wall"
+//config:      default y
+//config:      depends on FEATURE_UTMP
+//config:      help
+//config:        Write a message to all users that are logged in.
+
+/* Needs to be run by root or be suid root - needs to write to /dev/TTY: */
+//applet:IF_WALL(APPLET(wall, BB_DIR_USR_BIN, BB_SUID_REQUIRE))
+
+//kbuild:lib-$(CONFIG_WALL) += wall.o
+
+//usage:#define wall_trivial_usage
+//usage:       "[FILE]"
+//usage:#define wall_full_usage "\n\n"
+//usage:       "Write content of FILE or stdin to all logged-in users"
+//usage:
+//usage:#define wall_sample_usage
+//usage:       "echo foo | wall\n"
+//usage:       "wall ./mymessage"
+
 #include "libbb.h"
-#include <utmp.h>
 
 int wall_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int wall_main(int argc UNUSED_PARAM, char **argv)
 {
        struct utmp *ut;
        char *msg;
-       int fd = argv[1] ? xopen(argv[1], O_RDONLY) : STDIN_FILENO;
+       int fd;
 
+       fd = STDIN_FILENO;
+       if (argv[1]) {
+               /* The applet is setuid.
+                * Access to the file must be under user's uid/gid.
+                */
+               fd = xopen_as_uid_gid(argv[1], O_RDONLY, getuid(), getgid());
+       }
        msg = xmalloc_read(fd, NULL);
        if (ENABLE_FEATURE_CLEAN_UP && argv[1])
                close(fd);