18a16b7a1SPedro F. Giffuni /*-
28a16b7a1SPedro F. Giffuni * SPDX-License-Identifier: BSD-3-Clause
38a16b7a1SPedro F. Giffuni *
4ea022d16SRodney W. Grimes * Copyright (c) 1980, 1993
5ea022d16SRodney W. Grimes * The Regents of the University of California. All rights reserved.
6ea022d16SRodney W. Grimes *
7ea022d16SRodney W. Grimes * Redistribution and use in source and binary forms, with or without
8ea022d16SRodney W. Grimes * modification, are permitted provided that the following conditions
9ea022d16SRodney W. Grimes * are met:
10ea022d16SRodney W. Grimes * 1. Redistributions of source code must retain the above copyright
11ea022d16SRodney W. Grimes * notice, this list of conditions and the following disclaimer.
12ea022d16SRodney W. Grimes * 2. Redistributions in binary form must reproduce the above copyright
13ea022d16SRodney W. Grimes * notice, this list of conditions and the following disclaimer in the
14ea022d16SRodney W. Grimes * documentation and/or other materials provided with the distribution.
155efaea4cSChristian Brueffer * 3. Neither the name of the University nor the names of its contributors
16ea022d16SRodney W. Grimes * may be used to endorse or promote products derived from this software
17ea022d16SRodney W. Grimes * without specific prior written permission.
18ea022d16SRodney W. Grimes *
19ea022d16SRodney W. Grimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20ea022d16SRodney W. Grimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21ea022d16SRodney W. Grimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22ea022d16SRodney W. Grimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23ea022d16SRodney W. Grimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24ea022d16SRodney W. Grimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25ea022d16SRodney W. Grimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26ea022d16SRodney W. Grimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27ea022d16SRodney W. Grimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28ea022d16SRodney W. Grimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29ea022d16SRodney W. Grimes * SUCH DAMAGE.
30ea022d16SRodney W. Grimes */
31ea022d16SRodney W. Grimes
32ea022d16SRodney W. Grimes #include <sys/param.h>
33ea022d16SRodney W. Grimes #include <sys/socket.h>
34ea022d16SRodney W. Grimes #include <sys/stat.h>
35ea022d16SRodney W. Grimes #include <sys/file.h>
36ea022d16SRodney W. Grimes #include <sys/wait.h>
37ea022d16SRodney W. Grimes
38ea022d16SRodney W. Grimes #include <netinet/in.h>
39ea022d16SRodney W. Grimes
40ea022d16SRodney W. Grimes #include <ctype.h>
4155033a6fSPhilippe Charnier #include <err.h>
42ea022d16SRodney W. Grimes #include <errno.h>
43ea022d16SRodney W. Grimes #include <netdb.h>
44ea022d16SRodney W. Grimes #include <paths.h>
45ea022d16SRodney W. Grimes #include <pwd.h>
462a295922SPeter Wemm #include <termios.h>
47ea022d16SRodney W. Grimes #include <signal.h>
48ea022d16SRodney W. Grimes #include <stdio.h>
49ea022d16SRodney W. Grimes #include <stdlib.h>
50ea022d16SRodney W. Grimes #include <string.h>
51ea022d16SRodney W. Grimes #include <syslog.h>
52ea022d16SRodney W. Grimes #include <unistd.h>
53960aa5e0SEd Schouten #include <utmpx.h>
54ea022d16SRodney W. Grimes
554df6844bSEd Schouten static int debug = 0;
56ea022d16SRodney W. Grimes #define dsyslog if (debug) syslog
57ea022d16SRodney W. Grimes
58ea022d16SRodney W. Grimes #define MAXIDLE 120
59ea022d16SRodney W. Grimes
604df6844bSEd Schouten static char hostname[MAXHOSTNAMELEN];
61ea022d16SRodney W. Grimes
624df6844bSEd Schouten static void jkfprintf(FILE *, char[], char[], off_t);
634df6844bSEd Schouten static void mailfor(char *);
644df6844bSEd Schouten static void notify(struct utmpx *, char[], off_t, int);
654df6844bSEd Schouten static void reapchildren(int);
66ea022d16SRodney W. Grimes
67ea022d16SRodney W. Grimes int
main(int argc __unused,char * argv[]__unused)683e08d559SEd Schouten main(int argc __unused, char *argv[] __unused)
69ea022d16SRodney W. Grimes {
70ea022d16SRodney W. Grimes struct sockaddr_in from;
7178e3eed0SStefan Farfeleder socklen_t fromlen;
72e4bc453cSWarner Losh int cc;
7387fe4a3aSAndrey A. Chernov char msgbuf[256];
74ea022d16SRodney W. Grimes
75ea022d16SRodney W. Grimes /* verify proper invocation */
76ea022d16SRodney W. Grimes fromlen = sizeof(from);
7755033a6fSPhilippe Charnier if (getsockname(0, (struct sockaddr *)&from, &fromlen) < 0)
7855033a6fSPhilippe Charnier err(1, "getsockname");
79ea022d16SRodney W. Grimes openlog("comsat", LOG_PID, LOG_DAEMON);
80ea022d16SRodney W. Grimes if (chdir(_PATH_MAILDIR)) {
81ea022d16SRodney W. Grimes syslog(LOG_ERR, "chdir: %s: %m", _PATH_MAILDIR);
82ea022d16SRodney W. Grimes (void) recv(0, msgbuf, sizeof(msgbuf) - 1, 0);
83ea022d16SRodney W. Grimes exit(1);
84ea022d16SRodney W. Grimes }
85ea022d16SRodney W. Grimes (void)gethostname(hostname, sizeof(hostname));
86ea022d16SRodney W. Grimes (void)signal(SIGTTOU, SIG_IGN);
87ea022d16SRodney W. Grimes (void)signal(SIGCHLD, reapchildren);
88ea022d16SRodney W. Grimes for (;;) {
89ea022d16SRodney W. Grimes cc = recv(0, msgbuf, sizeof(msgbuf) - 1, 0);
90ea022d16SRodney W. Grimes if (cc <= 0) {
91ea022d16SRodney W. Grimes if (errno != EINTR)
92ea022d16SRodney W. Grimes sleep(1);
93ea022d16SRodney W. Grimes errno = 0;
94ea022d16SRodney W. Grimes continue;
95ea022d16SRodney W. Grimes }
96ea022d16SRodney W. Grimes msgbuf[cc] = '\0';
97ea022d16SRodney W. Grimes mailfor(msgbuf);
98ea022d16SRodney W. Grimes sigsetmask(0L);
99ea022d16SRodney W. Grimes }
100ea022d16SRodney W. Grimes }
101ea022d16SRodney W. Grimes
1024df6844bSEd Schouten static void
reapchildren(int signo __unused)1033e08d559SEd Schouten reapchildren(int signo __unused)
104ea022d16SRodney W. Grimes {
105ea022d16SRodney W. Grimes while (wait3(NULL, WNOHANG, NULL) > 0);
106ea022d16SRodney W. Grimes }
107ea022d16SRodney W. Grimes
1084df6844bSEd Schouten static void
mailfor(char * name)109e4bc453cSWarner Losh mailfor(char *name)
110ea022d16SRodney W. Grimes {
111960aa5e0SEd Schouten struct utmpx *utp;
112e4bc453cSWarner Losh char *cp;
11387fe4a3aSAndrey A. Chernov char *file;
114ea022d16SRodney W. Grimes off_t offset;
11587fe4a3aSAndrey A. Chernov int folder;
116960aa5e0SEd Schouten char buf[sizeof(_PATH_MAILDIR) + sizeof(utp->ut_user) + 1];
117960aa5e0SEd Schouten char buf2[sizeof(_PATH_MAILDIR) + sizeof(utp->ut_user) + 1];
118ea022d16SRodney W. Grimes
119ea022d16SRodney W. Grimes if (!(cp = strchr(name, '@')))
120ea022d16SRodney W. Grimes return;
121ea022d16SRodney W. Grimes *cp = '\0';
1221012cb60SAndrey A. Chernov offset = strtoll(cp + 1, NULL, 10);
12387fe4a3aSAndrey A. Chernov if (!(cp = strchr(cp + 1, ':')))
12487fe4a3aSAndrey A. Chernov file = name;
12587fe4a3aSAndrey A. Chernov else
12687fe4a3aSAndrey A. Chernov file = cp + 1;
127960aa5e0SEd Schouten sprintf(buf, "%s/%.*s", _PATH_MAILDIR, (int)sizeof(utp->ut_user),
1281a463b86SBruce Evans name);
12987fe4a3aSAndrey A. Chernov if (*file != '/') {
1301a463b86SBruce Evans sprintf(buf2, "%s/%.*s", _PATH_MAILDIR,
131960aa5e0SEd Schouten (int)sizeof(utp->ut_user), file);
13287fe4a3aSAndrey A. Chernov file = buf2;
13387fe4a3aSAndrey A. Chernov }
13487fe4a3aSAndrey A. Chernov folder = strcmp(buf, file);
135960aa5e0SEd Schouten setutxent();
136960aa5e0SEd Schouten while ((utp = getutxent()) != NULL)
137960aa5e0SEd Schouten if (utp->ut_type == USER_PROCESS && !strcmp(utp->ut_user, name))
13887fe4a3aSAndrey A. Chernov notify(utp, file, offset, folder);
139960aa5e0SEd Schouten endutxent();
140ea022d16SRodney W. Grimes }
141ea022d16SRodney W. Grimes
1423e08d559SEd Schouten static const char *cr;
143ea022d16SRodney W. Grimes
1444df6844bSEd Schouten static void
notify(struct utmpx * utp,char file[],off_t offset,int folder)145960aa5e0SEd Schouten notify(struct utmpx *utp, char file[], off_t offset, int folder)
146ea022d16SRodney W. Grimes {
147ea022d16SRodney W. Grimes FILE *tp;
148ea022d16SRodney W. Grimes struct stat stb;
1492a295922SPeter Wemm struct termios tio;
150960aa5e0SEd Schouten char tty[20];
151960aa5e0SEd Schouten const char *s = utp->ut_line;
152ea022d16SRodney W. Grimes
153960aa5e0SEd Schouten if (strncmp(s, "pts/", 4) == 0)
154960aa5e0SEd Schouten s += 4;
155960aa5e0SEd Schouten if (strchr(s, '/')) {
156ea022d16SRodney W. Grimes /* A slash is an attempt to break security... */
1574cb085f3SEd Schouten syslog(LOG_AUTH | LOG_NOTICE, "Unexpected `/' in `%s'",
1584cb085f3SEd Schouten utp->ut_line);
159ea022d16SRodney W. Grimes return;
160ea022d16SRodney W. Grimes }
1614cb085f3SEd Schouten (void)snprintf(tty, sizeof(tty), "%s%.*s",
1624cb085f3SEd Schouten _PATH_DEV, (int)sizeof(utp->ut_line), utp->ut_line);
1634cb085f3SEd Schouten if (stat(tty, &stb) == -1 || !(stb.st_mode & (S_IXUSR | S_IXGRP))) {
164960aa5e0SEd Schouten dsyslog(LOG_DEBUG, "%s: wrong mode on %s", utp->ut_user, tty);
165ea022d16SRodney W. Grimes return;
166ea022d16SRodney W. Grimes }
167189075e9SJaakko Heinonen dsyslog(LOG_DEBUG, "notify %s on %s", utp->ut_user, tty);
1684cb085f3SEd Schouten switch (fork()) {
1694cb085f3SEd Schouten case -1:
1704cb085f3SEd Schouten syslog(LOG_NOTICE, "fork failed (%m)");
171ea022d16SRodney W. Grimes return;
1724cb085f3SEd Schouten case 0:
1734cb085f3SEd Schouten break;
1744cb085f3SEd Schouten default:
1754cb085f3SEd Schouten return;
1764cb085f3SEd Schouten }
177ea022d16SRodney W. Grimes if ((tp = fopen(tty, "w")) == NULL) {
178ea022d16SRodney W. Grimes dsyslog(LOG_ERR, "%s: %s", tty, strerror(errno));
17955033a6fSPhilippe Charnier _exit(1);
180ea022d16SRodney W. Grimes }
1812a295922SPeter Wemm (void)tcgetattr(fileno(tp), &tio);
182163d0a5fSPeter Wemm cr = ((tio.c_oflag & (OPOST|ONLCR)) == (OPOST|ONLCR)) ? "\n" : "\n\r";
1837da9dccbSJohan Karlsson switch (stb.st_mode & (S_IXUSR | S_IXGRP)) {
1847da9dccbSJohan Karlsson case S_IXUSR:
1857da9dccbSJohan Karlsson case (S_IXUSR | S_IXGRP):
1867da9dccbSJohan Karlsson (void)fprintf(tp,
1877da9dccbSJohan Karlsson "%s\007New mail for %s@%.*s\007 has arrived%s%s%s:%s----%s",
188960aa5e0SEd Schouten cr, utp->ut_user, (int)sizeof(hostname), hostname,
18987fe4a3aSAndrey A. Chernov folder ? cr : "", folder ? "to " : "", folder ? file : "",
19087fe4a3aSAndrey A. Chernov cr, cr);
191960aa5e0SEd Schouten jkfprintf(tp, utp->ut_user, file, offset);
1927da9dccbSJohan Karlsson break;
1937da9dccbSJohan Karlsson case S_IXGRP:
1947da9dccbSJohan Karlsson (void)fprintf(tp, "\007");
1957da9dccbSJohan Karlsson (void)fflush(tp);
1967da9dccbSJohan Karlsson (void)sleep(1);
1977da9dccbSJohan Karlsson (void)fprintf(tp, "\007");
1987da9dccbSJohan Karlsson break;
1997da9dccbSJohan Karlsson default:
2007da9dccbSJohan Karlsson break;
2017da9dccbSJohan Karlsson }
202ea022d16SRodney W. Grimes (void)fclose(tp);
203ea022d16SRodney W. Grimes _exit(0);
204ea022d16SRodney W. Grimes }
205ea022d16SRodney W. Grimes
2064df6844bSEd Schouten static void
jkfprintf(FILE * tp,char user[],char file[],off_t offset)207e4bc453cSWarner Losh jkfprintf(FILE *tp, char user[], char file[], off_t offset)
208ea022d16SRodney W. Grimes {
209e4bc453cSWarner Losh unsigned char *cp, ch;
210e4bc453cSWarner Losh FILE *fi;
211e4bc453cSWarner Losh int linecnt, charcnt, inheader;
212e4bc453cSWarner Losh struct passwd *p;
2134541df7bSAndrey A. Chernov unsigned char line[BUFSIZ];
214ea022d16SRodney W. Grimes
215ea022d16SRodney W. Grimes /* Set effective uid to user in case mail drop is on nfs */
2166cde4348SPaul Traina if ((p = getpwnam(user)) != NULL)
217ea022d16SRodney W. Grimes (void) setuid(p->pw_uid);
218ea022d16SRodney W. Grimes
2196cde4348SPaul Traina if ((fi = fopen(file, "r")) == NULL)
220ea022d16SRodney W. Grimes return;
221ea022d16SRodney W. Grimes
2221012cb60SAndrey A. Chernov (void)fseeko(fi, offset, SEEK_CUR);
223ea022d16SRodney W. Grimes /*
224ea022d16SRodney W. Grimes * Print the first 7 lines or 560 characters of the new mail
225ea022d16SRodney W. Grimes * (whichever comes first). Skip header crap other than
226ea022d16SRodney W. Grimes * From, Subject, To, and Date.
227ea022d16SRodney W. Grimes */
228ea022d16SRodney W. Grimes linecnt = 7;
229ea022d16SRodney W. Grimes charcnt = 560;
230ea022d16SRodney W. Grimes inheader = 1;
231ea022d16SRodney W. Grimes while (fgets(line, sizeof(line), fi) != NULL) {
232ea022d16SRodney W. Grimes if (inheader) {
233ea022d16SRodney W. Grimes if (line[0] == '\n') {
234ea022d16SRodney W. Grimes inheader = 0;
235ea022d16SRodney W. Grimes continue;
236ea022d16SRodney W. Grimes }
237ea022d16SRodney W. Grimes if (line[0] == ' ' || line[0] == '\t' ||
23855033a6fSPhilippe Charnier (strncmp(line, "From:", 5) &&
23955033a6fSPhilippe Charnier strncmp(line, "Subject:", 8)))
240ea022d16SRodney W. Grimes continue;
241ea022d16SRodney W. Grimes }
242ea022d16SRodney W. Grimes if (linecnt <= 0 || charcnt <= 0) {
243ea022d16SRodney W. Grimes (void)fprintf(tp, "...more...%s", cr);
244ea022d16SRodney W. Grimes (void)fclose(fi);
245ea022d16SRodney W. Grimes return;
246ea022d16SRodney W. Grimes }
247ea022d16SRodney W. Grimes /* strip weird stuff so can't trojan horse stupid terminals */
248ea022d16SRodney W. Grimes for (cp = line; (ch = *cp) && ch != '\n'; ++cp, --charcnt) {
2494541df7bSAndrey A. Chernov /* disable upper controls and enable all other
2504541df7bSAndrey A. Chernov 8bit codes due to lack of locale knowledge
2514541df7bSAndrey A. Chernov */
2524541df7bSAndrey A. Chernov if (((ch & 0x80) && ch < 0xA0) ||
2534541df7bSAndrey A. Chernov (!(ch & 0x80) && !isprint(ch) &&
254fe38e2f8SAndrey A. Chernov !isspace(ch) && ch != '\a' && ch != '\b')
2554541df7bSAndrey A. Chernov ) {
2564541df7bSAndrey A. Chernov if (ch & 0x80) {
2574541df7bSAndrey A. Chernov ch &= ~0x80;
25887fe4a3aSAndrey A. Chernov (void)fputs("M-", tp);
2594541df7bSAndrey A. Chernov }
2604541df7bSAndrey A. Chernov if (iscntrl(ch)) {
2614541df7bSAndrey A. Chernov ch ^= 0x40;
26287fe4a3aSAndrey A. Chernov (void)fputc('^', tp);
26387fe4a3aSAndrey A. Chernov }
26487fe4a3aSAndrey A. Chernov }
265ea022d16SRodney W. Grimes (void)fputc(ch, tp);
266ea022d16SRodney W. Grimes }
267ea022d16SRodney W. Grimes (void)fputs(cr, tp);
268ea022d16SRodney W. Grimes --linecnt;
269ea022d16SRodney W. Grimes }
270ea022d16SRodney W. Grimes (void)fprintf(tp, "----%s\n", cr);
271ea022d16SRodney W. Grimes (void)fclose(fi);
272ea022d16SRodney W. Grimes }
273