124 lines
2.8 KiB
C
124 lines
2.8 KiB
C
/*
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* wall.c Write to all users logged in.
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*
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* Usage: wall [text]
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*
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* Version: @(#)wall 2.79 12-Sep-2000 miquels@cistron.nl
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*
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* This file is part of the sysvinit suite,
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* Copyright (C) 1991-2000 Miquel van Smoorenburg.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <pwd.h>
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#include <syslog.h>
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char *Version = "@(#) wall 2.79 12-Sep-2000 miquels@cistron.nl";
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#define MAXLEN 4096
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#define MAXLINES 20
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extern void wall(char *, int, int);
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int main(int argc, char **argv)
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{
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char buf[MAXLEN];
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char line[83];
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int i, f, ch;
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int len = 0;
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int remote = 0;
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char *p;
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char *whoami;
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struct passwd *pwd;
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buf[0] = 0;
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if ((pwd = getpwuid(getuid())) == NULL) {
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if (getuid() == 0)
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whoami = "root";
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else {
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fprintf(stderr, "You don't exist. Go away.\n");
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exit(1);
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}
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} else
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whoami = pwd->pw_name;
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while((ch = getopt(argc, argv, "n")) != EOF)
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switch(ch) {
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case 'n':
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/*
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* Undocumented option for suppressing
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* banner from rpc.rwalld. Only works if
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* we are root or if we're NOT setgid.
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*/
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if (geteuid() != 0 && getgid() != getegid()) {
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fprintf(stderr, "wall -n: not priviliged\n");
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exit(1);
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}
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remote = 1;
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break;
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default:
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fprintf(stderr, "usage: wall [message]\n");
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return 1;
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break;
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}
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if ((argc - optind) > 0) {
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for(f = optind; f < argc; f++) {
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len += strlen(argv[f]) + 1;
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if (len >= MAXLEN-2) break;
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strcat(buf, argv[f]);
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if (f < argc-1) strcat(buf, " ");
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}
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strcat(buf, "\r\n");
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} else {
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while(fgets(line, 80, stdin)) {
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/*
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* Make sure that line ends in \r\n
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*/
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for(p = line; *p && *p != '\r' && *p != '\n'; p++)
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;
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strcpy(p, "\r\n");
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len += strlen(line);
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if (len >= MAXLEN) break;
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strcat(buf, line);
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}
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}
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i = 0;
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for (p = buf; *p; p++) {
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if (*p == '\n' && i++ > MAXLINES) {
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*++p = 0;
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break;
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}
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}
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openlog("wall", LOG_PID, LOG_USER);
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syslog(LOG_INFO, "wall: user %s broadcasted %d lines (%d chars)",
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whoami, i, strlen(buf));
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closelog();
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unsetenv("TZ");
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wall(buf, 0, remote);
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/*NOTREACHED*/
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return 0;
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}
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