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 * @(#)comsat.c 8.1 (Berkeley) 6/4/93
34 * $FreeBSD: src/libexec/comsat/comsat.c,v 1.17 2005/02/14 17:42:56 stefanf Exp $
35 * $DragonFly: src/libexec/comsat/comsat.c,v 1.6 2005/05/03 17:39:03 liamfoy Exp $
38 #include <sys/param.h>
39 #include <sys/socket.h>
44 #include <netinet/in.h>
63 #define dsyslog if (debug) syslog
67 char hostname
[MAXHOSTNAMELEN
];
68 struct utmp
*utmp
= NULL
;
72 void jkfprintf (FILE *, const char *, const char *, off_t
);
73 void mailfor (char *);
74 void notify (struct utmp
*, char *, off_t
, int);
76 void reapchildren (int);
79 main(int argc __unused
, char **argv __unused
)
81 struct sockaddr_in from
;
86 /* verify proper invocation */
87 fromlen
= sizeof(from
);
88 if (getsockname(0, (struct sockaddr
*)&from
, &fromlen
) < 0)
89 err(1, "getsockname");
90 openlog("comsat", LOG_PID
, LOG_DAEMON
);
91 if (chdir(_PATH_MAILDIR
)) {
92 syslog(LOG_ERR
, "chdir: %s: %m", _PATH_MAILDIR
);
93 recv(0, msgbuf
, sizeof(msgbuf
) - 1, 0);
96 if ((uf
= open(_PATH_UTMP
, O_RDONLY
, 0)) < 0) {
97 syslog(LOG_ERR
, "open: %s: %m", _PATH_UTMP
);
98 recv(0, msgbuf
, sizeof(msgbuf
) - 1, 0);
102 gethostname(hostname
, sizeof(hostname
));
104 signal(SIGALRM
, onalrm
);
105 signal(SIGTTOU
, SIG_IGN
);
106 signal(SIGCHLD
, reapchildren
);
108 cc
= recv(0, msgbuf
, sizeof(msgbuf
) - 1, 0);
115 if (!nutmp
) /* no one has logged in yet */
117 sigblock(sigmask(SIGALRM
));
126 reapchildren(int signo __unused
)
128 while (wait3(NULL
, WNOHANG
, NULL
) > 0);
132 onalrm(int signo __unused
)
134 static u_int utmpsize
; /* last malloced size for utmp */
135 static time_t utmpmtime
; /* last modification time for utmp */
138 if (time(NULL
) - lastmsgtime
>= MAXIDLE
)
142 if (statbf
.st_mtime
> utmpmtime
) {
143 utmpmtime
= statbf
.st_mtime
;
144 if (statbf
.st_size
> utmpsize
) {
145 utmpsize
= statbf
.st_size
+ 10 * sizeof(struct utmp
);
146 if ((utmp
= realloc(utmp
, utmpsize
)) == NULL
) {
147 syslog(LOG_ERR
, "realloc: %m");
151 lseek(uf
, (off_t
)0, SEEK_SET
);
152 nutmp
= read(uf
, utmp
, (size_t)statbf
.st_size
)/sizeof(struct utmp
);
159 struct utmp
*utp
= &utmp
[nutmp
];
164 char buf
[sizeof(_PATH_MAILDIR
) + sizeof(utmp
[0].ut_name
) + 1];
165 char buf2
[sizeof(_PATH_MAILDIR
) + sizeof(utmp
[0].ut_name
) + 1];
167 if (!(cp
= strchr(name
, '@')))
170 offset
= strtoll(cp
+ 1, NULL
, 10);
171 if (!(cp
= strchr(cp
+ 1, ':')))
175 sprintf(buf
, "%s/%.*s", _PATH_MAILDIR
, (int)sizeof(utmp
[0].ut_name
),
178 sprintf(buf2
, "%s/%.*s", _PATH_MAILDIR
,
179 (int)sizeof(utmp
[0].ut_name
), file
);
182 folder
= strcmp(buf
, file
);
183 while (--utp
>= utmp
)
184 if (!strncmp(utp
->ut_name
, name
, sizeof(utmp
[0].ut_name
)))
185 notify(utp
, file
, offset
, folder
);
188 static const char *cr
;
191 notify(struct utmp
*utp
, char *file
, off_t offset
, int folder
)
196 char tty
[20], name
[sizeof(utmp
[0].ut_name
) + 1];
198 snprintf(tty
, sizeof(tty
), "%s%.*s",
199 _PATH_DEV
, (int)sizeof(utp
->ut_line
), utp
->ut_line
);
200 if (strchr(tty
+ sizeof(_PATH_DEV
) - 1, '/')) {
201 /* A slash is an attempt to break security... */
202 syslog(LOG_AUTH
| LOG_NOTICE
, "'/' in \"%s\"", tty
);
205 if (stat(tty
, &stb
) || !(stb
.st_mode
& (S_IXUSR
| S_IXGRP
))) {
206 dsyslog(LOG_DEBUG
, "%s: wrong mode on %s", utp
->ut_name
, tty
);
209 dsyslog(LOG_DEBUG
, "notify %s on %s\n", utp
->ut_name
, tty
);
212 signal(SIGALRM
, SIG_DFL
);
214 if ((tp
= fopen(tty
, "w")) == NULL
) {
215 dsyslog(LOG_ERR
, "%s: %s", tty
, strerror(errno
));
218 tcgetattr(fileno(tp
), &tio
);
219 cr
= ((tio
.c_oflag
& (OPOST
|ONLCR
)) == (OPOST
|ONLCR
)) ? "\n" : "\n\r";
220 strncpy(name
, utp
->ut_name
, sizeof(utp
->ut_name
));
221 name
[sizeof(name
) - 1] = '\0';
222 switch (stb
.st_mode
& (S_IXUSR
| S_IXGRP
)) {
224 case (S_IXUSR
| S_IXGRP
):
226 "%s\007New mail for %s@%.*s\007 has arrived%s%s%s:%s----%s",
227 cr
, name
, (int)sizeof(hostname
), hostname
,
228 folder
? cr
: "", folder
? "to " : "", folder
? file
: "",
230 jkfprintf(tp
, name
, file
, offset
);
246 jkfprintf(FILE *tp
, const char *user
, const char *file
, off_t offset
)
248 unsigned char *cp
, ch
;
250 int linecnt
, charcnt
, inheader
;
252 unsigned char line
[BUFSIZ
];
254 /* Set effective uid to user in case mail drop is on nfs */
255 if ((p
= getpwnam(user
)) != NULL
)
258 if ((fi
= fopen(file
, "r")) == NULL
)
261 fseeko(fi
, offset
, SEEK_SET
);
263 * Print the first 7 lines or 560 characters of the new mail
264 * (whichever comes first). Skip header crap other than
265 * From, Subject, To, and Date.
270 while (fgets(line
, sizeof(line
), fi
) != NULL
) {
272 if (line
[0] == '\n') {
276 if (line
[0] == ' ' || line
[0] == '\t' ||
277 (strncmp(line
, "From:", 5) &&
278 strncmp(line
, "Subject:", 8)))
281 if (linecnt
<= 0 || charcnt
<= 0) {
282 fprintf(tp
, "...more...%s", cr
);
286 /* strip weird stuff so can't trojan horse stupid terminals */
287 for (cp
= line
; (ch
= *cp
) && ch
!= '\n'; ++cp
, --charcnt
) {
288 /* disable upper controls and enable all other
289 8bit codes due to lack of locale knowledge
291 if (((ch
& 0x80) && ch
< 0xA0) ||
292 (!(ch
& 0x80) && !isprint(ch
) &&
293 !isspace(ch
) && ch
!= '\a' && ch
!= '\b')
309 fprintf(tp
, "----%s\n", cr
);