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 (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21
22 /*
23 * Copyright 2008 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 */
26
27 /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
28 /* All Rights Reserved */
29
30 #include "libmail.h"
31 #include <sys/types.h>
32 #include <sys/stat.h>
33 #include <fcntl.h>
34 #include <utmpx.h>
35 #include <syslog.h>
36 #if !defined(__cplusplus) && !defined(c_plusplus)
37 typedef void (*SIG_PF) (int);
38 #endif
39 #include <unistd.h>
40 #include <signal.h>
41
42 static void
catcher(int arg __unused)43 catcher(int arg __unused)
44 {
45 /* do nothing, but allow the write() to break */
46 }
47
48 void
notify(char * user,char * msg,int check_mesg_y,char * etcdir)49 notify(char *user, char *msg, int check_mesg_y, char *etcdir)
50 {
51 /* search the utmp file for this user */
52 SIG_PF old;
53 unsigned int oldalarm;
54 struct utmpx utmpx, *putmpx = &utmpx;
55
56 setutxent();
57
58 /* grab the tty name */
59 while ((putmpx = getutxent()) != NULL) {
60 if (strncmp(user, utmpx.ut_name,
61 sizeof (utmpx.ut_name)) == 0) {
62 char tty[sizeof (utmpx.ut_line)+1];
63 char dev[MAXFILENAME];
64 FILE *port;
65 size_t i;
66 int fd;
67
68 for (i = 0; i < sizeof (utmpx.ut_line); i++)
69 tty[i] = utmpx.ut_line[i];
70 tty[i] = '\0';
71
72 /* stick /dev/ in front */
73 (void) sprintf(dev, "%s/dev/%s", etcdir, tty);
74
75 /* break out if write() to the tty hangs */
76 old = (SIG_PF)signal(SIGALRM, catcher);
77 oldalarm = alarm(300);
78
79 /* check if device is really a tty */
80 if ((fd = open(dev, O_WRONLY|O_NOCTTY)) == -1) {
81 (void) fprintf(stderr,
82 "Cannot open %s.\n", dev);
83 continue;
84 } else {
85 if (!isatty(fd)) {
86 (void) fprintf(stderr, "%s in utmpx is "
87 "not a tty\n", tty);
88 openlog("mail", 0, LOG_AUTH);
89 syslog(LOG_CRIT, "%s in utmp is "
90 "not a tty\n", tty);
91 closelog();
92 (void) close(fd);
93 continue;
94 }
95 }
96 (void) close(fd);
97
98 /* write to the tty */
99 port = fopen(dev, "w");
100 if (port != 0) {
101 (void) fprintf(port, "\r\n%s\r\n", msg);
102 (void) fclose(port);
103 }
104
105 /* clean up our alarm */
106 (void) alarm(0);
107 (void) signal(SIGALRM, old);
108 (void) alarm(oldalarm);
109 }
110 }
111 endutxent();
112 }
113