minix/lib/libutil/ttyaction.c

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/* $NetBSD: ttyaction.c,v 1.19 2008/04/28 20:23:03 martin Exp $ */
/*-
* Copyright (c) 1996 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Gordon W. Ross.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/*
* For each matching "tty" and "action" run the "command."
* See fnmatch() for matching the tty name.
*/
#include <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
__RCSID("$NetBSD: ttyaction.c,v 1.19 2008/04/28 20:23:03 martin Exp $");
#endif /* LIBC_SCCS and not lint */
#include <sys/types.h>
#include <sys/wait.h>
#include <assert.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <fnmatch.h>
#include <paths.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "util.h"
#ifndef _PATH_TTYACTION
#define _PATH_TTYACTION "/etc/ttyaction"
#endif
static const char *actfile = _PATH_TTYACTION;
static const char *pathenv = "PATH=" _PATH_STDPATH;
int
ttyaction(const char *tty, const char *act, const char *user)
{
FILE *fp;
char *p1, *p2;
const char *argv[4];
const char *envp[8];
char *lastp;
char line[1024];
char env_tty[64];
char env_act[64];
char env_user[256];
int error, linenum, status;
pid_t pid;
_DIAGASSERT(tty != NULL);
_DIAGASSERT(act != NULL);
_DIAGASSERT(user != NULL);
fp = fopen(actfile, "r");
if (fp == NULL)
return 0;
/* Skip the "/dev/" part of the first arg. */
if (!strncmp(tty, "/dev/", (size_t)5))
tty += 5;
/* Args will be: "sh -c ..." */
argv[0] = _PATH_BSHELL;
argv[1] = "-c";
argv[2] = NULL; /* see below */
argv[3] = NULL;
/*
* Environment needs: TTY, ACT, USER
*/
snprintf(env_tty, sizeof(env_tty), "TTY=%s", tty);
snprintf(env_act, sizeof(env_act), "ACT=%s", act);
snprintf(env_user, sizeof(env_user), "USER=%s", user);
envp[0] = pathenv;
envp[1] = env_tty;
envp[2] = env_act;
envp[3] = env_user;
envp[4] = NULL;
linenum = 0;
status = 0;
while (fgets(line, (int)sizeof(line), fp)) {
linenum++;
/* Allow comment lines. */
if (line[0] == '#')
continue;
p1 = strtok_r(line, " \t", &lastp);
p2 = strtok_r(NULL, " \t", &lastp);
/* This arg goes to end of line. */
argv[2] = strtok_r(NULL, "\n", &lastp);
if (!p1 || !p2 || !argv[2]) {
warnx("%s: line %d format error", actfile, linenum);
continue;
}
if (fnmatch(p1, tty, 0) || fnmatch(p2, act, 0))
continue;
/* OK, this is a match. Run the command. */
pid = fork();
if (pid == -1) {
warnx("fork failed: %s", strerror(errno));
continue;
}
if (pid == 0) {
/* This is the child. */
error = execve(argv[0],
(char *const *)__UNCONST(argv),
(char *const *)__UNCONST(envp));
/* If we get here, it is an error. */
warnx("%s: line %d: exec failed: %s",
actfile, linenum, strerror(errno));
_exit(1);
}
/* This is the parent. */
error = waitpid(pid, &status, 0);
if (error == -1) {
warnx("%s: line %d: wait failed: %s",
actfile, linenum, strerror(errno));
continue;
}
if (WTERMSIG(status)) {
warnx("%s: line %d: child died with signal %d",
actfile, linenum, WTERMSIG(status));
continue;
}
}
fclose(fp);
return status;
}