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