2 * Copyright (c) 1980, 1993
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * @(#) Copyright (c) 1980, 1993 The Regents of the University of California. All rights reserved.
34 * @(#)comsat.c 8.1 (Berkeley) 6/4/93
35 * $FreeBSD: src/libexec/comsat/comsat.c,v 1.13.2.1 2002/08/09 02:56:30 johan Exp $
36 * $DragonFly: src/libexec/comsat/comsat.c,v 1.6 2005/05/03 17:39:03 liamfoy Exp $
39 #include <sys/param.h>
40 #include <sys/socket.h>
45 #include <netinet/in.h>
64 #define dsyslog if (debug) syslog
68 char hostname
[MAXHOSTNAMELEN
];
69 struct utmp
*utmp
= NULL
;
73 void jkfprintf (FILE *, const char *, const char *, off_t
);
74 void mailfor (char *);
75 void notify (struct utmp
*, char *, off_t
, int);
77 void reapchildren (int);
80 main(int argc __unused
, char **argv __unused
)
82 struct sockaddr_in from
;
87 /* verify proper invocation */
88 fromlen
= sizeof(from
);
89 if (getsockname(0, (struct sockaddr
*)&from
, &fromlen
) < 0)
90 err(1, "getsockname");
91 openlog("comsat", LOG_PID
, LOG_DAEMON
);
92 if (chdir(_PATH_MAILDIR
)) {
93 syslog(LOG_ERR
, "chdir: %s: %m", _PATH_MAILDIR
);
94 recv(0, msgbuf
, sizeof(msgbuf
) - 1, 0);
97 if ((uf
= open(_PATH_UTMP
, O_RDONLY
, 0)) < 0) {
98 syslog(LOG_ERR
, "open: %s: %m", _PATH_UTMP
);
99 recv(0, msgbuf
, sizeof(msgbuf
) - 1, 0);
103 gethostname(hostname
, sizeof(hostname
));
105 signal(SIGALRM
, onalrm
);
106 signal(SIGTTOU
, SIG_IGN
);
107 signal(SIGCHLD
, reapchildren
);
109 cc
= recv(0, msgbuf
, sizeof(msgbuf
) - 1, 0);
116 if (!nutmp
) /* no one has logged in yet */
118 sigblock(sigmask(SIGALRM
));
127 reapchildren(int signo __unused
)
129 while (wait3(NULL
, WNOHANG
, NULL
) > 0);
133 onalrm(int signo __unused
)
135 static u_int utmpsize
; /* last malloced size for utmp */
136 static time_t utmpmtime
; /* last modification time for utmp */
139 if (time(NULL
) - lastmsgtime
>= MAXIDLE
)
143 if (statbf
.st_mtime
> utmpmtime
) {
144 utmpmtime
= statbf
.st_mtime
;
145 if (statbf
.st_size
> utmpsize
) {
146 utmpsize
= statbf
.st_size
+ 10 * sizeof(struct utmp
);
147 if ((utmp
= realloc(utmp
, utmpsize
)) == NULL
) {
148 syslog(LOG_ERR
, "realloc: %m");
152 lseek(uf
, (off_t
)0, L_SET
);
153 nutmp
= read(uf
, utmp
, (int)statbf
.st_size
)/sizeof(struct utmp
);
160 struct utmp
*utp
= &utmp
[nutmp
];
165 char buf
[sizeof(_PATH_MAILDIR
) + sizeof(utmp
[0].ut_name
) + 1];
166 char buf2
[sizeof(_PATH_MAILDIR
) + sizeof(utmp
[0].ut_name
) + 1];
168 if (!(cp
= strchr(name
, '@')))
171 offset
= atoi(cp
+ 1);
172 if (!(cp
= strchr(cp
+ 1, ':')))
176 sprintf(buf
, "%s/%.*s", _PATH_MAILDIR
, (int)sizeof(utmp
[0].ut_name
),
179 sprintf(buf2
, "%s/%.*s", _PATH_MAILDIR
,
180 (int)sizeof(utmp
[0].ut_name
), file
);
183 folder
= strcmp(buf
, file
);
184 while (--utp
>= utmp
)
185 if (!strncmp(utp
->ut_name
, name
, sizeof(utmp
[0].ut_name
)))
186 notify(utp
, file
, offset
, folder
);
189 static const char *cr
;
192 notify(struct utmp
*utp
, char *file
, off_t offset
, int folder
)
197 char tty
[20], name
[sizeof(utmp
[0].ut_name
) + 1];
199 snprintf(tty
, sizeof(tty
), "%s%.*s",
200 _PATH_DEV
, (int)sizeof(utp
->ut_line
), utp
->ut_line
);
201 if (strchr(tty
+ sizeof(_PATH_DEV
) - 1, '/')) {
202 /* A slash is an attempt to break security... */
203 syslog(LOG_AUTH
| LOG_NOTICE
, "'/' in \"%s\"", tty
);
206 if (stat(tty
, &stb
) || !(stb
.st_mode
& (S_IXUSR
| S_IXGRP
))) {
207 dsyslog(LOG_DEBUG
, "%s: wrong mode on %s", utp
->ut_name
, tty
);
210 dsyslog(LOG_DEBUG
, "notify %s on %s\n", utp
->ut_name
, tty
);
213 signal(SIGALRM
, SIG_DFL
);
215 if ((tp
= fopen(tty
, "w")) == NULL
) {
216 dsyslog(LOG_ERR
, "%s: %s", tty
, strerror(errno
));
219 tcgetattr(fileno(tp
), &tio
);
220 cr
= ((tio
.c_oflag
& (OPOST
|ONLCR
)) == (OPOST
|ONLCR
)) ? "\n" : "\n\r";
221 strncpy(name
, utp
->ut_name
, sizeof(utp
->ut_name
));
222 name
[sizeof(name
) - 1] = '\0';
223 switch (stb
.st_mode
& (S_IXUSR
| S_IXGRP
)) {
225 case (S_IXUSR
| S_IXGRP
):
227 "%s\007New mail for %s@%.*s\007 has arrived%s%s%s:%s----%s",
228 cr
, name
, (int)sizeof(hostname
), hostname
,
229 folder
? cr
: "", folder
? "to " : "", folder
? file
: "",
231 jkfprintf(tp
, name
, file
, offset
);
247 jkfprintf(FILE *tp
, const char *user
, const char *file
, off_t offset
)
249 unsigned char *cp
, ch
;
251 int linecnt
, charcnt
, inheader
;
253 unsigned char line
[BUFSIZ
];
255 /* Set effective uid to user in case mail drop is on nfs */
256 if ((p
= getpwnam(user
)) != NULL
)
259 if ((fi
= fopen(file
, "r")) == NULL
)
262 fseek(fi
, offset
, L_SET
);
264 * Print the first 7 lines or 560 characters of the new mail
265 * (whichever comes first). Skip header crap other than
266 * From, Subject, To, and Date.
271 while (fgets(line
, sizeof(line
), fi
) != NULL
) {
273 if (line
[0] == '\n') {
277 if (line
[0] == ' ' || line
[0] == '\t' ||
278 (strncmp(line
, "From:", 5) &&
279 strncmp(line
, "Subject:", 8)))
282 if (linecnt
<= 0 || charcnt
<= 0) {
283 fprintf(tp
, "...more...%s", cr
);
287 /* strip weird stuff so can't trojan horse stupid terminals */
288 for (cp
= line
; (ch
= *cp
) && ch
!= '\n'; ++cp
, --charcnt
) {
289 /* disable upper controls and enable all other
290 8bit codes due to lack of locale knowledge
292 if (((ch
& 0x80) && ch
< 0xA0) ||
293 (!(ch
& 0x80) && !isprint(ch
) &&
294 !isspace(ch
) && ch
!= '\a' && ch
!= '\b')
310 fprintf(tp
, "----%s\n", cr
);