124 lines
2.8 KiB
C
124 lines
2.8 KiB
C
|
/*
|
||
|
|
* wall.c Write to all users logged in.
|
||
|
|
*
|
||
|
|
* Usage: wall [text]
|
||
|
|
*
|
||
|
|
* Version: @(#)wall 2.79 12-Sep-2000 miquels@cistron.nl
|
||
|
|
*
|
||
|
|
* This file is part of the sysvinit suite,
|
||
|
|
* Copyright (C) 1991-2000 Miquel van Smoorenburg.
|
||
|
|
*
|
||
|
|
* This program is free software; you can redistribute it and/or modify
|
||
|
|
* it under the terms of the GNU General Public License as published by
|
||
|
|
* the Free Software Foundation; either version 2 of the License, or
|
||
|
|
* (at your option) any later version.
|
||
|
|
*
|
||
|
|
* This program 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 General Public License for more details.
|
||
|
|
*
|
||
|
|
* You should have received a copy of the GNU General Public License
|
||
|
|
* along with this program; if not, write to the Free Software
|
||
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <stdio.h>
|
||
|
|
#include <string.h>
|
||
|
|
#include <stdlib.h>
|
||
|
|
#include <unistd.h>
|
||
|
|
#include <pwd.h>
|
||
|
|
#include <syslog.h>
|
||
|
|
|
||
|
|
|
||
|
|
char *Version = "@(#) wall 2.79 12-Sep-2000 miquels@cistron.nl";
|
||
|
|
#define MAXLEN 4096
|
||
|
|
#define MAXLINES 20
|
||
|
|
|
||
|
|
extern void wall(char *, int, int);
|
||
|
|
|
||
|
|
int main(int argc, char **argv)
|
||
|
|
{
|
||
|
|
char buf[MAXLEN];
|
||
|
|
char line[83];
|
||
|
|
int i, f, ch;
|
||
|
|
int len = 0;
|
||
|
|
int remote = 0;
|
||
|
|
char *p;
|
||
|
|
char *whoami;
|
||
|
|
struct passwd *pwd;
|
||
|
|
|
||
|
|
buf[0] = 0;
|
||
|
|
if ((pwd = getpwuid(getuid())) == NULL) {
|
||
|
|
if (getuid() == 0)
|
||
|
|
whoami = "root";
|
||
|
|
else {
|
||
|
|
fprintf(stderr, "You don't exist. Go away.\n");
|
||
|
|
exit(1);
|
||
|
|
}
|
||
|
|
} else
|
||
|
|
whoami = pwd->pw_name;
|
||
|
|
|
||
|
|
while((ch = getopt(argc, argv, "n")) != EOF)
|
||
|
|
switch(ch) {
|
||
|
|
case 'n':
|
||
|
|
/*
|
||
|
|
* Undocumented option for suppressing
|
||
|
|
* banner from rpc.rwalld. Only works if
|
||
|
|
* we are root or if we're NOT setgid.
|
||
|
|
*/
|
||
|
|
if (geteuid() != 0 && getgid() != getegid()) {
|
||
|
|
fprintf(stderr, "wall -n: not priviliged\n");
|
||
|
|
exit(1);
|
||
|
|
}
|
||
|
|
remote = 1;
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
fprintf(stderr, "usage: wall [message]\n");
|
||
|
|
return 1;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
if ((argc - optind) > 0) {
|
||
|
|
for(f = optind; f < argc; f++) {
|
||
|
|
len += strlen(argv[f]) + 1;
|
||
|
|
if (len >= MAXLEN-2) break;
|
||
|
|
strcat(buf, argv[f]);
|
||
|
|
if (f < argc-1) strcat(buf, " ");
|
||
|
|
}
|
||
|
|
strcat(buf, "\r\n");
|
||
|
|
} else {
|
||
|
|
while(fgets(line, 80, stdin)) {
|
||
|
|
/*
|
||
|
|
* Make sure that line ends in \r\n
|
||
|
|
*/
|
||
|
|
for(p = line; *p && *p != '\r' && *p != '\n'; p++)
|
||
|
|
;
|
||
|
|
strcpy(p, "\r\n");
|
||
|
|
len += strlen(line);
|
||
|
|
if (len >= MAXLEN) break;
|
||
|
|
strcat(buf, line);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
i = 0;
|
||
|
|
for (p = buf; *p; p++) {
|
||
|
|
if (*p == '\n' && i++ > MAXLINES) {
|
||
|
|
*++p = 0;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
openlog("wall", LOG_PID, LOG_USER);
|
||
|
|
syslog(LOG_INFO, "wall: user %s broadcasted %d lines (%d chars)",
|
||
|
|
whoami, i, strlen(buf));
|
||
|
|
closelog();
|
||
|
|
|
||
|
|
unsetenv("TZ");
|
||
|
|
wall(buf, 0, remote);
|
||
|
|
|
||
|
|
/*NOTREACHED*/
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|