2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 1980, 1993
5 * The Regents of the University of California. All rights reserved.
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8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * @(#)comsat.c 8.1 (Berkeley) 6/4/93
32 * $FreeBSD: head/libexec/comsat/comsat.c 326025 2017-11-20 19:49:47Z pfg $
35 #include <sys/param.h>
36 #include <sys/socket.h>
41 #include <netinet/in.h>
60 #define dsyslog if (debug) syslog
64 static char hostname[MAXHOSTNAMELEN];
66 static void jkfprintf(FILE *, char[], char[], off_t);
67 static void mailfor(char *);
68 static void notify(struct utmpx *, char[], off_t, int);
69 static void reapchildren(int);
72 main(int argc __unused, char *argv[] __unused)
74 struct sockaddr_in from;
79 /* verify proper invocation */
80 fromlen = sizeof(from);
81 if (getsockname(0, (struct sockaddr *)&from, &fromlen) < 0)
82 err(1, "getsockname");
83 openlog("comsat", LOG_PID, LOG_DAEMON);
84 if (chdir(_PATH_MAILDIR)) {
85 syslog(LOG_ERR, "chdir: %s: %m", _PATH_MAILDIR);
86 recv(0, msgbuf, sizeof(msgbuf) - 1, 0);
89 gethostname(hostname, sizeof(hostname));
90 signal(SIGTTOU, SIG_IGN);
91 signal(SIGCHLD, reapchildren);
93 cc = recv(0, msgbuf, sizeof(msgbuf) - 1, 0);
107 reapchildren(int signo __unused)
109 while (wait3(NULL, WNOHANG, NULL) > 0);
120 char buf[sizeof(_PATH_MAILDIR) + sizeof(utp->ut_user) + 1];
121 char buf2[sizeof(_PATH_MAILDIR) + sizeof(utp->ut_user) + 1];
123 if (!(cp = strchr(name, '@')))
126 offset = strtoll(cp + 1, NULL, 10);
127 if (!(cp = strchr(cp + 1, ':')))
131 sprintf(buf, "%s/%.*s", _PATH_MAILDIR, (int)sizeof(utp->ut_user),
134 sprintf(buf2, "%s/%.*s", _PATH_MAILDIR,
135 (int)sizeof(utp->ut_user), file);
138 folder = strcmp(buf, file);
140 while ((utp = getutxent()) != NULL)
141 if (utp->ut_type == USER_PROCESS && !strcmp(utp->ut_user, name))
142 notify(utp, file, offset, folder);
146 static const char *cr;
149 notify(struct utmpx *utp, char file[], off_t offset, int folder)
155 const char *s = utp->ut_line;
157 if (strncmp(s, "pts/", 4) == 0)
159 if (strchr(s, '/')) {
160 /* A slash is an attempt to break security... */
161 syslog(LOG_AUTH | LOG_NOTICE, "Unexpected `/' in `%s'",
165 snprintf(tty, sizeof(tty), "%s%.*s",
166 _PATH_DEV, (int)sizeof(utp->ut_line), utp->ut_line);
167 if (stat(tty, &stb) == -1 || !(stb.st_mode & (S_IXUSR | S_IXGRP))) {
168 dsyslog(LOG_DEBUG, "%s: wrong mode on %s", utp->ut_user, tty);
171 dsyslog(LOG_DEBUG, "notify %s on %s", utp->ut_user, tty);
174 syslog(LOG_NOTICE, "fork failed (%m)");
181 if ((tp = fopen(tty, "w")) == NULL) {
182 dsyslog(LOG_ERR, "%s: %s", tty, strerror(errno));
185 tcgetattr(fileno(tp), &tio);
186 cr = ((tio.c_oflag & (OPOST|ONLCR)) == (OPOST|ONLCR)) ? "\n" : "\n\r";
187 switch (stb.st_mode & (S_IXUSR | S_IXGRP)) {
189 case (S_IXUSR | S_IXGRP):
191 "%s\007New mail for %s@%.*s\007 has arrived%s%s%s:%s----%s",
192 cr, utp->ut_user, (int)sizeof(hostname), hostname,
193 folder ? cr : "", folder ? "to " : "", folder ? file : "",
195 jkfprintf(tp, utp->ut_user, file, offset);
211 jkfprintf(FILE *tp, char user[], char file[], off_t offset)
213 unsigned char *cp, ch;
215 int linecnt, charcnt, inheader;
217 unsigned char line[BUFSIZ];
219 /* Set effective uid to user in case mail drop is on nfs */
220 if ((p = getpwnam(user)) != NULL)
223 if ((fi = fopen(file, "r")) == NULL)
226 fseeko(fi, offset, SEEK_CUR);
228 * Print the first 7 lines or 560 characters of the new mail
229 * (whichever comes first). Skip header crap other than
230 * From, Subject, To, and Date.
235 while (fgets(line, sizeof(line), fi) != NULL) {
237 if (line[0] == '\n') {
241 if (line[0] == ' ' || line[0] == '\t' ||
242 (strncmp(line, "From:", 5) &&
243 strncmp(line, "Subject:", 8)))
246 if (linecnt <= 0 || charcnt <= 0) {
247 fprintf(tp, "...more...%s", cr);
251 /* strip weird stuff so can't trojan horse stupid terminals */
252 for (cp = line; (ch = *cp) && ch != '\n'; ++cp, --charcnt) {
253 /* disable upper controls and enable all other
254 8bit codes due to lack of locale knowledge
256 if (((ch & 0x80) && ch < 0xA0) ||
257 (!(ch & 0x80) && !isprint(ch) &&
258 !isspace(ch) && ch != '\a' && ch != '\b')
274 fprintf(tp, "----%s\n", cr);