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 /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */ 23 /* All Rights Reserved */ 24 25 26 /* 27 * Copyright (c) 1998-1999 by Sun Microsystems, Inc. 28 * All rights reserved. 29 */ 30 #pragma ident "%Z%%M% %I% %E% SMI" /* SVr4.0 1.4 */ 31 /*LINTLIBRARY*/ 32 33 #include "synonyms.h" 34 #include "libmail.h" 35 #include <sys/types.h> 36 #include <sys/stat.h> 37 #include <fcntl.h> 38 #include <utmpx.h> 39 #include <syslog.h> 40 #if !defined(__cplusplus) && !defined(c_plusplus) 41 typedef void (*SIG_PF) (int); 42 #endif 43 #include <unistd.h> 44 #include <signal.h> 45 46 static SIG_PF catcher(void); 47 48 static SIG_PF catcher(void) 49 { 50 /* do nothing, but allow the write() to break */ 51 return (0); 52 } 53 54 void 55 notify(char *user, char *msg, int check_mesg_y, char *etcdir) 56 { 57 /* search the utmp file for this user */ 58 SIG_PF old; 59 unsigned int oldalarm; 60 struct utmpx utmpx, *putmpx = &utmpx; 61 62 setutxent(); 63 64 /* grab the tty name */ 65 while ((putmpx = getutxent()) != NULL) { 66 if (strncmp(user, utmpx.ut_name, 67 sizeof (utmpx.ut_name)) == 0) { 68 char tty[sizeof (utmpx.ut_line)+1]; 69 char dev[MAXFILENAME]; 70 FILE *port; 71 size_t i; 72 int fd; 73 74 for (i = 0; i < sizeof (utmpx.ut_line); i++) 75 tty[i] = utmpx.ut_line[i]; 76 tty[i] = '\0'; 77 78 /* stick /dev/ in front */ 79 (void) sprintf(dev, "%s/dev/%s", etcdir, tty); 80 81 /* break out if write() to the tty hangs */ 82 old = (SIG_PF)signal(SIGALRM, (SIG_PF)catcher); 83 oldalarm = alarm(300); 84 85 /* check if device is really a tty */ 86 if ((fd = open(dev, O_WRONLY|O_NOCTTY)) == -1) { 87 (void) fprintf(stderr, 88 "Cannot open %s.\n", dev); 89 continue; 90 } else { 91 if (!isatty(fd)) { 92 (void) fprintf(stderr, "%s in utmpx is " 93 "not a tty\n", tty); 94 openlog("mail", 0, LOG_AUTH); 95 syslog(LOG_CRIT, "%s in utmp is " 96 "not a tty\n", tty); 97 closelog(); 98 (void) close(fd); 99 continue; 100 } 101 } 102 (void) close(fd); 103 104 /* write to the tty */ 105 port = fopen(dev, "w"); 106 if (port != 0) { 107 (void) fprintf(port, "\r\n%s\r\n", msg); 108 (void) fclose(port); 109 } 110 111 /* clean up our alarm */ 112 (void) alarm(0); 113 (void) signal(SIGALRM, old); 114 (void) alarm(oldalarm); 115 } 116 } 117 endutxent(); 118 } 119