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. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * @(#)comsat.c 8.1 (Berkeley) 6/4/93
30 * $FreeBSD: src/libexec/comsat/comsat.c,v 1.17 2005/02/14 17:42:56 stefanf Exp $
33 #include <sys/param.h>
34 #include <sys/socket.h>
39 #include <netinet/in.h>
58 #define dsyslog if (debug) syslog
62 char hostname
[MAXHOSTNAMELEN
];
63 struct utmp
*utmp
= NULL
;
67 void jkfprintf (FILE *, const char *, const char *, off_t
);
68 void mailfor (char *);
69 void notify (struct utmp
*, char *, off_t
, int);
71 void reapchildren (int);
74 main(int argc __unused
, char **argv __unused
)
76 struct sockaddr_in from
;
81 /* verify proper invocation */
82 fromlen
= sizeof(from
);
83 if (getsockname(0, (struct sockaddr
*)&from
, &fromlen
) < 0)
84 err(1, "getsockname");
85 openlog("comsat", LOG_PID
, LOG_DAEMON
);
86 if (chdir(_PATH_MAILDIR
)) {
87 syslog(LOG_ERR
, "chdir: %s: %m", _PATH_MAILDIR
);
88 recv(0, msgbuf
, sizeof(msgbuf
) - 1, 0);
91 if ((uf
= open(_PATH_UTMP
, O_RDONLY
, 0)) < 0) {
92 syslog(LOG_ERR
, "open: %s: %m", _PATH_UTMP
);
93 recv(0, msgbuf
, sizeof(msgbuf
) - 1, 0);
97 gethostname(hostname
, sizeof(hostname
));
99 signal(SIGALRM
, onalrm
);
100 signal(SIGTTOU
, SIG_IGN
);
101 signal(SIGCHLD
, reapchildren
);
103 cc
= recv(0, msgbuf
, sizeof(msgbuf
) - 1, 0);
110 if (!nutmp
) /* no one has logged in yet */
112 sigblock(sigmask(SIGALRM
));
121 reapchildren(int signo __unused
)
123 while (wait3(NULL
, WNOHANG
, NULL
) > 0);
127 onalrm(int signo __unused
)
129 static u_int utmpsize
; /* last malloced size for utmp */
130 static time_t utmpmtime
; /* last modification time for utmp */
133 if (time(NULL
) - lastmsgtime
>= MAXIDLE
)
137 if (statbf
.st_mtime
> utmpmtime
) {
138 utmpmtime
= statbf
.st_mtime
;
139 if (statbf
.st_size
> utmpsize
) {
140 utmpsize
= statbf
.st_size
+ 10 * sizeof(struct utmp
);
141 if ((utmp
= realloc(utmp
, utmpsize
)) == NULL
) {
142 syslog(LOG_ERR
, "realloc: %m");
146 lseek(uf
, (off_t
)0, SEEK_SET
);
147 nutmp
= read(uf
, utmp
, (size_t)statbf
.st_size
)/sizeof(struct utmp
);
154 struct utmp
*utp
= &utmp
[nutmp
];
159 char buf
[sizeof(_PATH_MAILDIR
) + sizeof(utmp
[0].ut_name
) + 1];
160 char buf2
[sizeof(_PATH_MAILDIR
) + sizeof(utmp
[0].ut_name
) + 1];
162 if (!(cp
= strchr(name
, '@')))
165 offset
= strtoll(cp
+ 1, NULL
, 10);
166 if (!(cp
= strchr(cp
+ 1, ':')))
170 sprintf(buf
, "%s/%.*s", _PATH_MAILDIR
, (int)sizeof(utmp
[0].ut_name
),
173 sprintf(buf2
, "%s/%.*s", _PATH_MAILDIR
,
174 (int)sizeof(utmp
[0].ut_name
), file
);
177 folder
= strcmp(buf
, file
);
178 while (--utp
>= utmp
)
179 if (!strncmp(utp
->ut_name
, name
, sizeof(utmp
[0].ut_name
)))
180 notify(utp
, file
, offset
, folder
);
183 static const char *cr
;
186 notify(struct utmp
*utp
, char *file
, off_t offset
, int folder
)
191 char tty
[20], name
[sizeof(utmp
[0].ut_name
) + 1];
193 snprintf(tty
, sizeof(tty
), "%s%.*s",
194 _PATH_DEV
, (int)sizeof(utp
->ut_line
), utp
->ut_line
);
195 if (strchr(tty
+ sizeof(_PATH_DEV
) - 1, '/')) {
196 /* A slash is an attempt to break security... */
197 syslog(LOG_AUTH
| LOG_NOTICE
, "'/' in \"%s\"", tty
);
200 if (stat(tty
, &stb
) || !(stb
.st_mode
& (S_IXUSR
| S_IXGRP
))) {
201 dsyslog(LOG_DEBUG
, "%s: wrong mode on %s", utp
->ut_name
, tty
);
204 dsyslog(LOG_DEBUG
, "notify %s on %s\n", utp
->ut_name
, tty
);
207 signal(SIGALRM
, SIG_DFL
);
209 if ((tp
= fopen(tty
, "w")) == NULL
) {
210 dsyslog(LOG_ERR
, "%s: %s", tty
, strerror(errno
));
213 tcgetattr(fileno(tp
), &tio
);
214 cr
= ((tio
.c_oflag
& (OPOST
|ONLCR
)) == (OPOST
|ONLCR
)) ? "\n" : "\n\r";
215 strncpy(name
, utp
->ut_name
, sizeof(name
) - 1);
216 name
[sizeof(name
) - 1] = '\0';
217 switch (stb
.st_mode
& (S_IXUSR
| S_IXGRP
)) {
219 case (S_IXUSR
| S_IXGRP
):
221 "%s\007New mail for %s@%.*s\007 has arrived%s%s%s:%s----%s",
222 cr
, name
, (int)sizeof(hostname
), hostname
,
223 folder
? cr
: "", folder
? "to " : "", folder
? file
: "",
225 jkfprintf(tp
, name
, file
, offset
);
241 jkfprintf(FILE *tp
, const char *user
, const char *file
, off_t offset
)
243 unsigned char *cp
, ch
;
245 int linecnt
, charcnt
, inheader
;
247 unsigned char line
[BUFSIZ
];
249 /* Set effective uid to user in case mail drop is on nfs */
250 if ((p
= getpwnam(user
)) != NULL
)
253 if ((fi
= fopen(file
, "r")) == NULL
)
256 fseeko(fi
, offset
, SEEK_SET
);
258 * Print the first 7 lines or 560 characters of the new mail
259 * (whichever comes first). Skip header crap other than
260 * From, Subject, To, and Date.
265 while (fgets(line
, sizeof(line
), fi
) != NULL
) {
267 if (line
[0] == '\n') {
271 if (line
[0] == ' ' || line
[0] == '\t' ||
272 (strncmp(line
, "From:", 5) &&
273 strncmp(line
, "Subject:", 8)))
276 if (linecnt
<= 0 || charcnt
<= 0) {
277 fprintf(tp
, "...more...%s", cr
);
281 /* strip weird stuff so can't trojan horse stupid terminals */
282 for (cp
= line
; (ch
= *cp
) && ch
!= '\n'; ++cp
, --charcnt
) {
283 /* disable upper controls and enable all other
284 8bit codes due to lack of locale knowledge
286 if (((ch
& 0x80) && ch
< 0xA0) ||
287 (!(ch
& 0x80) && !isprint(ch
) &&
288 !isspace(ch
) && ch
!= '\a' && ch
!= '\b')
304 fprintf(tp
, "----%s\n", cr
);