mirror of
https://git.freebsd.org/src.git
synced 2026-01-16 23:02:24 +00:00
e40a2c4927
Fixes: 91629228e3
MFC after: 1 week
Reviewed by: emaste
Differential Revision: https://reviews.freebsd.org/D51581
264 lines
6.9 KiB
C
264 lines
6.9 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (c) 1980, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/param.h>
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#include <sys/socket.h>
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#include <sys/stat.h>
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#include <sys/file.h>
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#include <sys/wait.h>
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#include <netinet/in.h>
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#include <ctype.h>
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#include <err.h>
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#include <errno.h>
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#include <netdb.h>
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#include <paths.h>
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#include <pwd.h>
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#include <termios.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <syslog.h>
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#include <unistd.h>
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#include <utmpx.h>
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static int debug = 0;
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#define dsyslog if (debug) syslog
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#define MAXIDLE 120
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static char hostname[MAXHOSTNAMELEN];
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static void jkfprintf(FILE *, char[], off_t);
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static void mailfor(char *);
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static void notify(struct utmpx *, char[], off_t, int);
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static void reapchildren(int);
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int
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main(int argc __unused, char *argv[] __unused)
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{
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struct sockaddr_in from;
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socklen_t fromlen;
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int cc;
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char msgbuf[256];
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/* verify proper invocation */
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fromlen = sizeof(from);
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if (getsockname(0, (struct sockaddr *)&from, &fromlen) < 0)
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err(1, "getsockname");
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openlog("comsat", LOG_PID, LOG_DAEMON);
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if (chdir(_PATH_MAILDIR)) {
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syslog(LOG_ERR, "chdir: %s: %m", _PATH_MAILDIR);
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(void) recv(0, msgbuf, sizeof(msgbuf) - 1, 0);
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exit(1);
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}
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(void)gethostname(hostname, sizeof(hostname));
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(void)signal(SIGTTOU, SIG_IGN);
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(void)signal(SIGCHLD, reapchildren);
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for (;;) {
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cc = recv(0, msgbuf, sizeof(msgbuf) - 1, 0);
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if (cc <= 0) {
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if (errno != EINTR)
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sleep(1);
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errno = 0;
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continue;
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}
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msgbuf[cc] = '\0';
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mailfor(msgbuf);
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sigsetmask(0L);
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}
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}
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static void
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reapchildren(int signo __unused)
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{
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while (wait3(NULL, WNOHANG, NULL) > 0);
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}
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static void
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mailfor(char *name)
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{
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struct utmpx *utp;
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char *cp;
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char *file;
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off_t offset;
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int folder;
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char buf[MAXPATHLEN];
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if ((cp = strchr(name, '@')) == NULL)
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return;
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*cp = '\0';
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offset = strtoll(cp + 1, NULL, 10);
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if ((cp = strchr(cp + 1, ':')) != NULL &&
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strchr((file = cp + 1), '/') == NULL) {
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snprintf(buf, sizeof(buf), "%s/%s", _PATH_MAILDIR, file);
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folder = 1;
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} else {
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snprintf(buf, sizeof(buf), "%s/%s", _PATH_MAILDIR, name);
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folder = 0;
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}
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setutxent();
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while ((utp = getutxent()) != NULL)
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if (utp->ut_type == USER_PROCESS && !strcmp(utp->ut_user, name))
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notify(utp, buf, offset, folder);
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endutxent();
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}
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static const char *cr;
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static void
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notify(struct utmpx *utp, char file[], off_t offset, int folder)
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{
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FILE *tp;
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struct stat stb;
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struct termios tio;
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struct passwd *p;
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char tty[20];
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const char *s = utp->ut_line;
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if (strncmp(s, "pts/", 4) == 0)
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s += 4;
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if (strchr(s, '/')) {
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/* A slash is an attempt to break security... */
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syslog(LOG_AUTH | LOG_NOTICE, "Unexpected `/' in `%s'",
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utp->ut_line);
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return;
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}
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(void)snprintf(tty, sizeof(tty), "%s%s", _PATH_DEV, utp->ut_line);
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if (stat(tty, &stb) == -1 || !(stb.st_mode & (S_IXUSR | S_IXGRP))) {
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dsyslog(LOG_DEBUG, "%s: wrong mode on %s", utp->ut_user, tty);
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return;
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}
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dsyslog(LOG_DEBUG, "notify %s on %s", utp->ut_user, tty);
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switch (fork()) {
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case -1:
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syslog(LOG_NOTICE, "fork failed (%m)");
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return;
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case 0:
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break;
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default:
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return;
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}
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if ((tp = fopen(tty, "w")) == NULL) {
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dsyslog(LOG_ERR, "%s: %s", tty, strerror(errno));
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_exit(1);
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}
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(void)tcgetattr(fileno(tp), &tio);
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cr = ((tio.c_oflag & (OPOST|ONLCR)) == (OPOST|ONLCR)) ? "\n" : "\n\r";
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/* Set uid/gid/groups to user's in case mail drop is on nfs */
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if ((p = getpwnam(utp->ut_user)) == NULL ||
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initgroups(p->pw_name, p->pw_gid) == -1 ||
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setgid(p->pw_gid) == -1 ||
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setuid(p->pw_uid) == -1)
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_exit(1);
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if (stb.st_mode & S_IXUSR) {
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(void)fprintf(tp,
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"%s\007New mail for %s@%.*s\007 has arrived%s%s%s:%s----%s",
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cr, utp->ut_user, (int)sizeof(hostname), hostname,
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folder ? cr : "", folder ? "to " : "", folder ? file : "",
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cr, cr);
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jkfprintf(tp, file, offset);
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} else if (stb.st_mode & S_IXGRP) {
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(void)fprintf(tp, "\007");
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(void)fflush(tp);
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(void)sleep(1);
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(void)fprintf(tp, "\007");
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}
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(void)fclose(tp);
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_exit(0);
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}
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static void
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jkfprintf(FILE *tp, char file[], off_t offset)
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{
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unsigned char *cp, ch;
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FILE *fi;
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int linecnt, charcnt, inheader;
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unsigned char line[BUFSIZ];
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if ((fi = fopen(file, "r")) == NULL)
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return;
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(void)fseeko(fi, offset, SEEK_CUR);
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/*
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* Print the first 7 lines or 560 characters of the new mail
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* (whichever comes first). Skip header crap other than
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* From, Subject, To, and Date.
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*/
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linecnt = 7;
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charcnt = 560;
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inheader = 1;
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while (fgets(line, sizeof(line), fi) != NULL) {
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if (inheader) {
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if (line[0] == '\n') {
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inheader = 0;
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continue;
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}
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if (line[0] == ' ' || line[0] == '\t' ||
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(strncmp(line, "From:", 5) &&
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strncmp(line, "Subject:", 8)))
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continue;
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}
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if (linecnt <= 0 || charcnt <= 0) {
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(void)fprintf(tp, "...more...%s", cr);
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(void)fclose(fi);
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return;
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}
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/* strip weird stuff so can't trojan horse stupid terminals */
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for (cp = line; (ch = *cp) && ch != '\n'; ++cp, --charcnt) {
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/* disable upper controls and enable all other
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8bit codes due to lack of locale knowledge
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*/
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if (((ch & 0x80) && ch < 0xA0) ||
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(!(ch & 0x80) && !isprint(ch) &&
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!isspace(ch) && ch != '\a' && ch != '\b')
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) {
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if (ch & 0x80) {
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ch &= ~0x80;
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(void)fputs("M-", tp);
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}
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if (iscntrl(ch)) {
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ch ^= 0x40;
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(void)fputc('^', tp);
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}
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}
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(void)fputc(ch, tp);
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}
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(void)fputs(cr, tp);
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--linecnt;
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}
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(void)fprintf(tp, "----%s\n", cr);
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(void)fclose(fi);
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}
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