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![Pedro F. Giffuni](/assets/img/avatar_default.png)
Mainly focus on files that use BSD 3-Clause license. The Software Package Data Exchange (SPDX) group provides a specification to make it easier for automated tools to detect and summarize well known opensource licenses. We are gradually adopting the specification, noting that the tags are considered only advisory and do not, in any way, superceed or replace the license texts. Special thanks to Wind River for providing access to "The Duke of Highlander" tool: an older (2014) run over FreeBSD tree was useful as a starting point.
287 lines
7.4 KiB
C
287 lines
7.4 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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#ifndef lint
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static const char copyright[] =
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"@(#) Copyright (c) 1980, 1993\n\
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The Regents of the University of California. All rights reserved.\n";
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#endif /* not lint */
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)comsat.c 8.1 (Berkeley) 6/4/93";
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#endif
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static const char rcsid[] =
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"$FreeBSD$";
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#endif /* not lint */
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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[], 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[sizeof(_PATH_MAILDIR) + sizeof(utp->ut_user) + 1];
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char buf2[sizeof(_PATH_MAILDIR) + sizeof(utp->ut_user) + 1];
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if (!(cp = strchr(name, '@')))
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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, ':')))
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file = name;
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else
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file = cp + 1;
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sprintf(buf, "%s/%.*s", _PATH_MAILDIR, (int)sizeof(utp->ut_user),
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name);
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if (*file != '/') {
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sprintf(buf2, "%s/%.*s", _PATH_MAILDIR,
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(int)sizeof(utp->ut_user), file);
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file = buf2;
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}
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folder = strcmp(buf, file);
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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, file, 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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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",
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_PATH_DEV, (int)sizeof(utp->ut_line), 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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switch (stb.st_mode & (S_IXUSR | S_IXGRP)) {
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case S_IXUSR:
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case (S_IXUSR | S_IXGRP):
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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, utp->ut_user, file, offset);
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break;
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case 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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break;
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default:
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break;
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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 user[], 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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struct passwd *p;
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unsigned char line[BUFSIZ];
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/* Set effective uid to user in case mail drop is on nfs */
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if ((p = getpwnam(user)) != NULL)
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(void) setuid(p->pw_uid);
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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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