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
35 static const char copyright[] =
36 "@(#) Copyright (c) 1980, 1993\n\
37 The Regents of the University of California. All rights reserved.\n";
42 static char sccsid[] = "@(#)comsat.c 8.1 (Berkeley) 6/4/93";
44 static const char rcsid[] =
45 "$FreeBSD: src/libexec/comsat/comsat.c,v 1.13.2.1 2002/08/09 02:56:30 johan Exp $";
48 #include <sys/param.h>
49 #include <sys/socket.h>
54 #include <netinet/in.h>
72 #define dsyslog if (debug) syslog
76 char hostname[MAXHOSTNAMELEN];
77 struct utmp *utmp = NULL;
81 void jkfprintf __P((FILE *, char[], char[], off_t));
82 void mailfor __P((char *));
83 void notify __P((struct utmp *, char[], off_t, int));
84 void onalrm __P((int));
85 void reapchildren __P((int));
92 struct sockaddr_in from;
97 /* verify proper invocation */
98 fromlen = sizeof(from);
99 if (getsockname(0, (struct sockaddr *)&from, &fromlen) < 0)
100 err(1, "getsockname");
101 openlog("comsat", LOG_PID, LOG_DAEMON);
102 if (chdir(_PATH_MAILDIR)) {
103 syslog(LOG_ERR, "chdir: %s: %m", _PATH_MAILDIR);
104 (void) recv(0, msgbuf, sizeof(msgbuf) - 1, 0);
107 if ((uf = open(_PATH_UTMP, O_RDONLY, 0)) < 0) {
108 syslog(LOG_ERR, "open: %s: %m", _PATH_UTMP);
109 (void) recv(0, msgbuf, sizeof(msgbuf) - 1, 0);
112 (void)time(&lastmsgtime);
113 (void)gethostname(hostname, sizeof(hostname));
115 (void)signal(SIGALRM, onalrm);
116 (void)signal(SIGTTOU, SIG_IGN);
117 (void)signal(SIGCHLD, reapchildren);
119 cc = recv(0, msgbuf, sizeof(msgbuf) - 1, 0);
126 if (!nutmp) /* no one has logged in yet */
128 sigblock(sigmask(SIGALRM));
130 (void)time(&lastmsgtime);
140 while (wait3(NULL, WNOHANG, NULL) > 0);
147 static u_int utmpsize; /* last malloced size for utmp */
148 static u_int utmpmtime; /* last modification time for utmp */
151 if (time(NULL) - lastmsgtime >= MAXIDLE)
153 (void)alarm((u_int)15);
154 (void)fstat(uf, &statbf);
155 if (statbf.st_mtime > utmpmtime) {
156 utmpmtime = statbf.st_mtime;
157 if (statbf.st_size > utmpsize) {
158 utmpsize = statbf.st_size + 10 * sizeof(struct utmp);
159 if ((utmp = realloc(utmp, utmpsize)) == NULL) {
160 syslog(LOG_ERR, "%s", strerror(errno));
164 (void)lseek(uf, (off_t)0, L_SET);
165 nutmp = read(uf, utmp, (int)statbf.st_size)/sizeof(struct utmp);
173 register struct utmp *utp = &utmp[nutmp];
178 char buf[sizeof(_PATH_MAILDIR) + sizeof(utmp[0].ut_name) + 1];
179 char buf2[sizeof(_PATH_MAILDIR) + sizeof(utmp[0].ut_name) + 1];
181 if (!(cp = strchr(name, '@')))
184 offset = atoi(cp + 1);
185 if (!(cp = strchr(cp + 1, ':')))
189 sprintf(buf, "%s/%.*s", _PATH_MAILDIR, (int)sizeof(utmp[0].ut_name),
192 sprintf(buf2, "%s/%.*s", _PATH_MAILDIR,
193 (int)sizeof(utmp[0].ut_name), file);
196 folder = strcmp(buf, file);
197 while (--utp >= utmp)
198 if (!strncmp(utp->ut_name, name, sizeof(utmp[0].ut_name)))
199 notify(utp, file, offset, folder);
205 notify(utp, file, offset, folder)
206 register struct utmp *utp;
214 char tty[20], name[sizeof(utmp[0].ut_name) + 1];
216 (void)snprintf(tty, sizeof(tty), "%s%.*s",
217 _PATH_DEV, (int)sizeof(utp->ut_line), utp->ut_line);
218 if (strchr(tty + sizeof(_PATH_DEV) - 1, '/')) {
219 /* A slash is an attempt to break security... */
220 syslog(LOG_AUTH | LOG_NOTICE, "'/' in \"%s\"", tty);
223 if (stat(tty, &stb) || !(stb.st_mode & (S_IXUSR | S_IXGRP))) {
224 dsyslog(LOG_DEBUG, "%s: wrong mode on %s", utp->ut_name, tty);
227 dsyslog(LOG_DEBUG, "notify %s on %s\n", utp->ut_name, tty);
230 (void)signal(SIGALRM, SIG_DFL);
231 (void)alarm((u_int)30);
232 if ((tp = fopen(tty, "w")) == NULL) {
233 dsyslog(LOG_ERR, "%s: %s", tty, strerror(errno));
236 (void)tcgetattr(fileno(tp), &tio);
237 cr = ((tio.c_oflag & (OPOST|ONLCR)) == (OPOST|ONLCR)) ? "\n" : "\n\r";
238 (void)strncpy(name, utp->ut_name, sizeof(utp->ut_name));
239 name[sizeof(name) - 1] = '\0';
240 switch (stb.st_mode & (S_IXUSR | S_IXGRP)) {
242 case (S_IXUSR | S_IXGRP):
244 "%s\007New mail for %s@%.*s\007 has arrived%s%s%s:%s----%s",
245 cr, name, (int)sizeof(hostname), hostname,
246 folder ? cr : "", folder ? "to " : "", folder ? file : "",
248 jkfprintf(tp, name, file, offset);
251 (void)fprintf(tp, "\007");
254 (void)fprintf(tp, "\007");
264 jkfprintf(tp, user, file, offset)
270 register unsigned char *cp, ch;
272 register int linecnt, charcnt, inheader;
273 register struct passwd *p;
274 unsigned char line[BUFSIZ];
276 /* Set effective uid to user in case mail drop is on nfs */
277 if ((p = getpwnam(user)) != NULL)
278 (void) setuid(p->pw_uid);
280 if ((fi = fopen(file, "r")) == NULL)
283 (void)fseek(fi, offset, L_SET);
285 * Print the first 7 lines or 560 characters of the new mail
286 * (whichever comes first). Skip header crap other than
287 * From, Subject, To, and Date.
292 while (fgets(line, sizeof(line), fi) != NULL) {
294 if (line[0] == '\n') {
298 if (line[0] == ' ' || line[0] == '\t' ||
299 (strncmp(line, "From:", 5) &&
300 strncmp(line, "Subject:", 8)))
303 if (linecnt <= 0 || charcnt <= 0) {
304 (void)fprintf(tp, "...more...%s", cr);
308 /* strip weird stuff so can't trojan horse stupid terminals */
309 for (cp = line; (ch = *cp) && ch != '\n'; ++cp, --charcnt) {
310 /* disable upper controls and enable all other
311 8bit codes due to lack of locale knowledge
313 if (((ch & 0x80) && ch < 0xA0) ||
314 (!(ch & 0x80) && !isprint(ch) &&
315 !isspace(ch) && ch != '\a' && ch != '\b')
319 (void)fputs("M-", tp);
323 (void)fputc('^', tp);
331 (void)fprintf(tp, "----%s\n", cr);