1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 23 /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */ 24 /* All Rights Reserved */ 25 26 /* 27 * Copyright 2006 Sun Microsystems, Inc. All rights reserved. 28 * Use is subject to license terms. 29 */ 30 31 #pragma ident "%Z%%M% %I% %E% SMI" /* SVr4.0 1.4 */ 32 /*LINTLIBRARY*/ 33 34 #include "c_synonyms.h" 35 #include "libmail.h" 36 #include <sys/types.h> 37 #include <sys/stat.h> 38 #include <fcntl.h> 39 #include <utmpx.h> 40 #include <syslog.h> 41 #if !defined(__cplusplus) && !defined(c_plusplus) 42 typedef void (*SIG_PF) (int); 43 #endif 44 #include <unistd.h> 45 #include <signal.h> 46 47 static SIG_PF catcher(void); 48 49 static SIG_PF catcher(void) 50 { 51 /* do nothing, but allow the write() to break */ 52 return (0); 53 } 54 55 void 56 notify(char *user, char *msg, int check_mesg_y, char *etcdir) 57 { 58 /* search the utmp file for this user */ 59 SIG_PF old; 60 unsigned int oldalarm; 61 struct utmpx utmpx, *putmpx = &utmpx; 62 63 setutxent(); 64 65 /* grab the tty name */ 66 while ((putmpx = getutxent()) != NULL) { 67 if (strncmp(user, utmpx.ut_name, 68 sizeof (utmpx.ut_name)) == 0) { 69 char tty[sizeof (utmpx.ut_line)+1]; 70 char dev[MAXFILENAME]; 71 FILE *port; 72 size_t i; 73 int fd; 74 75 for (i = 0; i < sizeof (utmpx.ut_line); i++) 76 tty[i] = utmpx.ut_line[i]; 77 tty[i] = '\0'; 78 79 /* stick /dev/ in front */ 80 (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