notifyu.c revision 1219:f89f56c2d9ac
126219Swpaul/* 226219Swpaul * CDDL HEADER START 326219Swpaul * 426219Swpaul * The contents of this file are subject to the terms of the 526219Swpaul * Common Development and Distribution License, Version 1.0 only 626219Swpaul * (the "License"). You may not use this file except in compliance 726219Swpaul * with the License. 826219Swpaul * 926219Swpaul * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 1026219Swpaul * or http://www.opensolaris.org/os/licensing. 1126219Swpaul * See the License for the specific language governing permissions 1226219Swpaul * and limitations under the License. 1326219Swpaul * 1426219Swpaul * When distributing Covered Code, include this CDDL HEADER in each 1526219Swpaul * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 1626219Swpaul * If applicable, add the following below this CDDL HEADER, with the 1726219Swpaul * fields enclosed by brackets "[]" replaced with your own identifying 1826219Swpaul * information: Portions Copyright [yyyy] [name of copyright owner] 1926219Swpaul * 2026219Swpaul * CDDL HEADER END 2126219Swpaul */ 2226219Swpaul 2326219Swpaul/* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */ 2426219Swpaul/* All Rights Reserved */ 2526219Swpaul 2626219Swpaul/* 2726219Swpaul * Copyright 2006 Sun Microsystems, Inc. All rights reserved. 2826219Swpaul * Use is subject to license terms. 2926219Swpaul */ 3026219Swpaul 3126219Swpaul#pragma ident "%Z%%M% %I% %E% SMI" /* SVr4.0 1.4 */ 3226219Swpaul/*LINTLIBRARY*/ 3374462Salfred 3426219Swpaul#include "c_synonyms.h" 3526219Swpaul#include "libmail.h" 3626219Swpaul#include <sys/types.h> 3726219Swpaul#include <sys/stat.h> 3826219Swpaul#include <fcntl.h> 3926219Swpaul#include <utmpx.h> 4074462Salfred#include <syslog.h> 4126219Swpaul#if !defined(__cplusplus) && !defined(c_plusplus) 4226219Swpaultypedef void (*SIG_PF) (int); 4326219Swpaul#endif 4474462Salfred#include <unistd.h> 4526219Swpaul#include <signal.h> 4626219Swpaul 4726219Swpaulstatic SIG_PF catcher(void); 4826219Swpaul 4926219Swpaulstatic SIG_PF catcher(void) 5026219Swpaul{ 5126219Swpaul /* do nothing, but allow the write() to break */ 5226219Swpaul return (0); 5326219Swpaul} 5426219Swpaul 5526219Swpaulvoid 5626219Swpaulnotify(char *user, char *msg, int check_mesg_y, char *etcdir) 5726219Swpaul{ 5826219Swpaul /* search the utmp file for this user */ 5926219Swpaul SIG_PF old; 6026219Swpaul unsigned int oldalarm; 6126219Swpaul struct utmpx utmpx, *putmpx = &utmpx; 6226219Swpaul 6326219Swpaul setutxent(); 6426219Swpaul 6526219Swpaul /* grab the tty name */ 6626219Swpaul while ((putmpx = getutxent()) != NULL) { 6726219Swpaul if (strncmp(user, utmpx.ut_name, 6826219Swpaul sizeof (utmpx.ut_name)) == 0) { 6926219Swpaul char tty[sizeof (utmpx.ut_line)+1]; 7026219Swpaul char dev[MAXFILENAME]; 7126219Swpaul FILE *port; 7226219Swpaul size_t i; 7326219Swpaul int fd; 7490271Salfred 7526219Swpaul for (i = 0; i < sizeof (utmpx.ut_line); i++) 7626219Swpaul tty[i] = utmpx.ut_line[i]; 7726219Swpaul tty[i] = '\0'; 7826219Swpaul 7926219Swpaul /* stick /dev/ in front */ 8026219Swpaul (void) sprintf(dev, "%s/dev/%s", etcdir, tty); 81 82 /* break out if write() to the tty hangs */ 83 old = (SIG_PF)signal(SIGALRM, (SIG_PF)catcher); 84 oldalarm = alarm(300); 85 86 /* check if device is really a tty */ 87 if ((fd = open(dev, O_WRONLY|O_NOCTTY)) == -1) { 88 (void) fprintf(stderr, 89 "Cannot open %s.\n", dev); 90 continue; 91 } else { 92 if (!isatty(fd)) { 93 (void) fprintf(stderr, "%s in utmpx is " 94 "not a tty\n", tty); 95 openlog("mail", 0, LOG_AUTH); 96 syslog(LOG_CRIT, "%s in utmp is " 97 "not a tty\n", tty); 98 closelog(); 99 (void) close(fd); 100 continue; 101 } 102 } 103 (void) close(fd); 104 105 /* write to the tty */ 106 port = fopen(dev, "w"); 107 if (port != 0) { 108 (void) fprintf(port, "\r\n%s\r\n", msg); 109 (void) fclose(port); 110 } 111 112 /* clean up our alarm */ 113 (void) alarm(0); 114 (void) signal(SIGALRM, old); 115 (void) alarm(oldalarm); 116 } 117 } 118 endutxent(); 119} 120