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[] =
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(FILE *, char[], char[], off_t);
83 void notify(struct utmp *, char[], off_t, int);
85 void reapchildren(int);
88 main(int argc, char *argv[])
90 struct sockaddr_in from;
95 /* verify proper invocation */
96 fromlen = sizeof(from);
97 if (getsockname(0, (struct sockaddr *)&from, &fromlen) < 0)
98 err(1, "getsockname");
99 openlog("comsat", LOG_PID, LOG_DAEMON);
100 if (chdir(_PATH_MAILDIR)) {
101 syslog(LOG_ERR, "chdir: %s: %m", _PATH_MAILDIR);
102 (void) recv(0, msgbuf, sizeof(msgbuf) - 1, 0);
105 if ((uf = open(_PATH_UTMP, O_RDONLY, 0)) < 0) {
106 syslog(LOG_ERR, "open: %s: %m", _PATH_UTMP);
107 (void) recv(0, msgbuf, sizeof(msgbuf) - 1, 0);
110 (void)time(&lastmsgtime);
111 (void)gethostname(hostname, sizeof(hostname));
113 (void)signal(SIGALRM, onalrm);
114 (void)signal(SIGTTOU, SIG_IGN);
115 (void)signal(SIGCHLD, reapchildren);
117 cc = recv(0, msgbuf, sizeof(msgbuf) - 1, 0);
124 if (!nutmp) /* no one has logged in yet */
126 sigblock(sigmask(SIGALRM));
128 (void)time(&lastmsgtime);
135 reapchildren(int signo)
137 while (wait3(NULL, WNOHANG, NULL) > 0);
143 static u_int utmpsize; /* last malloced size for utmp */
144 static u_int utmpmtime; /* last modification time for utmp */
147 if (time(NULL) - lastmsgtime >= MAXIDLE)
149 (void)alarm((u_int)15);
150 (void)fstat(uf, &statbf);
151 if (statbf.st_mtime > utmpmtime) {
152 utmpmtime = statbf.st_mtime;
153 if (statbf.st_size > utmpsize) {
154 utmpsize = statbf.st_size + 10 * sizeof(struct utmp);
155 if ((utmp = realloc(utmp, utmpsize)) == NULL) {
156 syslog(LOG_ERR, "%s", strerror(errno));
160 (void)lseek(uf, (off_t)0, SEEK_SET);
161 nutmp = read(uf, utmp, (size_t)statbf.st_size)/sizeof(struct utmp);
168 struct utmp *utp = &utmp[nutmp];
173 char buf[sizeof(_PATH_MAILDIR) + sizeof(utmp[0].ut_name) + 1];
174 char buf2[sizeof(_PATH_MAILDIR) + sizeof(utmp[0].ut_name) + 1];
176 if (!(cp = strchr(name, '@')))
179 offset = strtoll(cp + 1, NULL, 10);
180 if (!(cp = strchr(cp + 1, ':')))
184 sprintf(buf, "%s/%.*s", _PATH_MAILDIR, (int)sizeof(utmp[0].ut_name),
187 sprintf(buf2, "%s/%.*s", _PATH_MAILDIR,
188 (int)sizeof(utmp[0].ut_name), file);
191 folder = strcmp(buf, file);
192 while (--utp >= utmp)
193 if (!strncmp(utp->ut_name, name, sizeof(utmp[0].ut_name)))
194 notify(utp, file, offset, folder);
200 notify(struct utmp *utp, char file[], off_t offset, int folder)
205 char tty[20], name[sizeof(utmp[0].ut_name) + 1];
206 const char *cr = utp->ut_line;
208 if (strncmp(cr, "pts/", 4) == 0)
210 if (strchr(cr, '/')) {
211 /* A slash is an attempt to break security... */
212 syslog(LOG_AUTH | LOG_NOTICE, "Unexpected `/' in `%s'",
216 (void)snprintf(tty, sizeof(tty), "%s%.*s",
217 _PATH_DEV, (int)sizeof(utp->ut_line), utp->ut_line);
218 if (stat(tty, &stb) == -1 || !(stb.st_mode & (S_IXUSR | S_IXGRP))) {
219 dsyslog(LOG_DEBUG, "%s: wrong mode on %s", utp->ut_name, tty);
222 dsyslog(LOG_DEBUG, "notify %s on %s\n", utp->ut_name, tty);
225 syslog(LOG_NOTICE, "fork failed (%m)");
232 (void)signal(SIGALRM, SIG_DFL);
233 (void)alarm((u_int)30);
234 if ((tp = fopen(tty, "w")) == NULL) {
235 dsyslog(LOG_ERR, "%s: %s", tty, strerror(errno));
238 (void)tcgetattr(fileno(tp), &tio);
239 cr = ((tio.c_oflag & (OPOST|ONLCR)) == (OPOST|ONLCR)) ? "\n" : "\n\r";
240 (void)strncpy(name, utp->ut_name, sizeof(utp->ut_name));
241 name[sizeof(name) - 1] = '\0';
242 switch (stb.st_mode & (S_IXUSR | S_IXGRP)) {
244 case (S_IXUSR | S_IXGRP):
246 "%s\007New mail for %s@%.*s\007 has arrived%s%s%s:%s----%s",
247 cr, name, (int)sizeof(hostname), hostname,
248 folder ? cr : "", folder ? "to " : "", folder ? file : "",
250 jkfprintf(tp, name, file, offset);
253 (void)fprintf(tp, "\007");
256 (void)fprintf(tp, "\007");
266 jkfprintf(FILE *tp, char user[], char file[], off_t offset)
268 unsigned char *cp, ch;
270 int linecnt, charcnt, inheader;
272 unsigned char line[BUFSIZ];
274 /* Set effective uid to user in case mail drop is on nfs */
275 if ((p = getpwnam(user)) != NULL)
276 (void) setuid(p->pw_uid);
278 if ((fi = fopen(file, "r")) == NULL)
281 (void)fseeko(fi, offset, SEEK_CUR);
283 * Print the first 7 lines or 560 characters of the new mail
284 * (whichever comes first). Skip header crap other than
285 * From, Subject, To, and Date.
290 while (fgets(line, sizeof(line), fi) != NULL) {
292 if (line[0] == '\n') {
296 if (line[0] == ' ' || line[0] == '\t' ||
297 (strncmp(line, "From:", 5) &&
298 strncmp(line, "Subject:", 8)))
301 if (linecnt <= 0 || charcnt <= 0) {
302 (void)fprintf(tp, "...more...%s", cr);
306 /* strip weird stuff so can't trojan horse stupid terminals */
307 for (cp = line; (ch = *cp) && ch != '\n'; ++cp, --charcnt) {
308 /* disable upper controls and enable all other
309 8bit codes due to lack of locale knowledge
311 if (((ch & 0x80) && ch < 0xA0) ||
312 (!(ch & 0x80) && !isprint(ch) &&
313 !isspace(ch) && ch != '\a' && ch != '\b')
317 (void)fputs("M-", tp);
321 (void)fputc('^', tp);
329 (void)fprintf(tp, "----%s\n", cr);