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