freebsd-dev/libexec/comsat/comsat.c
Christian Brueffer 5efaea4cc6 Remove the 3rd clause ("advertising clause") of the BSD license as
permitted by the University of Berkeley on July 22, 1999.

Reviewed by:	imp
MFC after:	1 week
2014-02-17 22:27:32 +00:00

285 lines
7.4 KiB
C

/*
* Copyright (c) 1980, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef lint
static const char copyright[] =
"@(#) Copyright (c) 1980, 1993\n\
The Regents of the University of California. All rights reserved.\n";
#endif /* not lint */
#ifndef lint
#if 0
static char sccsid[] = "@(#)comsat.c 8.1 (Berkeley) 6/4/93";
#endif
static const char rcsid[] =
"$FreeBSD$";
#endif /* not lint */
#include <sys/param.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/file.h>
#include <sys/wait.h>
#include <netinet/in.h>
#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <netdb.h>
#include <paths.h>
#include <pwd.h>
#include <termios.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <unistd.h>
#include <utmpx.h>
static int debug = 0;
#define dsyslog if (debug) syslog
#define MAXIDLE 120
static char hostname[MAXHOSTNAMELEN];
static void jkfprintf(FILE *, char[], char[], off_t);
static void mailfor(char *);
static void notify(struct utmpx *, char[], off_t, int);
static void reapchildren(int);
int
main(int argc __unused, char *argv[] __unused)
{
struct sockaddr_in from;
socklen_t fromlen;
int cc;
char msgbuf[256];
/* verify proper invocation */
fromlen = sizeof(from);
if (getsockname(0, (struct sockaddr *)&from, &fromlen) < 0)
err(1, "getsockname");
openlog("comsat", LOG_PID, LOG_DAEMON);
if (chdir(_PATH_MAILDIR)) {
syslog(LOG_ERR, "chdir: %s: %m", _PATH_MAILDIR);
(void) recv(0, msgbuf, sizeof(msgbuf) - 1, 0);
exit(1);
}
(void)gethostname(hostname, sizeof(hostname));
(void)signal(SIGTTOU, SIG_IGN);
(void)signal(SIGCHLD, reapchildren);
for (;;) {
cc = recv(0, msgbuf, sizeof(msgbuf) - 1, 0);
if (cc <= 0) {
if (errno != EINTR)
sleep(1);
errno = 0;
continue;
}
msgbuf[cc] = '\0';
mailfor(msgbuf);
sigsetmask(0L);
}
}
static void
reapchildren(int signo __unused)
{
while (wait3(NULL, WNOHANG, NULL) > 0);
}
static void
mailfor(char *name)
{
struct utmpx *utp;
char *cp;
char *file;
off_t offset;
int folder;
char buf[sizeof(_PATH_MAILDIR) + sizeof(utp->ut_user) + 1];
char buf2[sizeof(_PATH_MAILDIR) + sizeof(utp->ut_user) + 1];
if (!(cp = strchr(name, '@')))
return;
*cp = '\0';
offset = strtoll(cp + 1, NULL, 10);
if (!(cp = strchr(cp + 1, ':')))
file = name;
else
file = cp + 1;
sprintf(buf, "%s/%.*s", _PATH_MAILDIR, (int)sizeof(utp->ut_user),
name);
if (*file != '/') {
sprintf(buf2, "%s/%.*s", _PATH_MAILDIR,
(int)sizeof(utp->ut_user), file);
file = buf2;
}
folder = strcmp(buf, file);
setutxent();
while ((utp = getutxent()) != NULL)
if (utp->ut_type == USER_PROCESS && !strcmp(utp->ut_user, name))
notify(utp, file, offset, folder);
endutxent();
}
static const char *cr;
static void
notify(struct utmpx *utp, char file[], off_t offset, int folder)
{
FILE *tp;
struct stat stb;
struct termios tio;
char tty[20];
const char *s = utp->ut_line;
if (strncmp(s, "pts/", 4) == 0)
s += 4;
if (strchr(s, '/')) {
/* A slash is an attempt to break security... */
syslog(LOG_AUTH | LOG_NOTICE, "Unexpected `/' in `%s'",
utp->ut_line);
return;
}
(void)snprintf(tty, sizeof(tty), "%s%.*s",
_PATH_DEV, (int)sizeof(utp->ut_line), utp->ut_line);
if (stat(tty, &stb) == -1 || !(stb.st_mode & (S_IXUSR | S_IXGRP))) {
dsyslog(LOG_DEBUG, "%s: wrong mode on %s", utp->ut_user, tty);
return;
}
dsyslog(LOG_DEBUG, "notify %s on %s", utp->ut_user, tty);
switch (fork()) {
case -1:
syslog(LOG_NOTICE, "fork failed (%m)");
return;
case 0:
break;
default:
return;
}
if ((tp = fopen(tty, "w")) == NULL) {
dsyslog(LOG_ERR, "%s: %s", tty, strerror(errno));
_exit(1);
}
(void)tcgetattr(fileno(tp), &tio);
cr = ((tio.c_oflag & (OPOST|ONLCR)) == (OPOST|ONLCR)) ? "\n" : "\n\r";
switch (stb.st_mode & (S_IXUSR | S_IXGRP)) {
case S_IXUSR:
case (S_IXUSR | S_IXGRP):
(void)fprintf(tp,
"%s\007New mail for %s@%.*s\007 has arrived%s%s%s:%s----%s",
cr, utp->ut_user, (int)sizeof(hostname), hostname,
folder ? cr : "", folder ? "to " : "", folder ? file : "",
cr, cr);
jkfprintf(tp, utp->ut_user, file, offset);
break;
case S_IXGRP:
(void)fprintf(tp, "\007");
(void)fflush(tp);
(void)sleep(1);
(void)fprintf(tp, "\007");
break;
default:
break;
}
(void)fclose(tp);
_exit(0);
}
static void
jkfprintf(FILE *tp, char user[], char file[], off_t offset)
{
unsigned char *cp, ch;
FILE *fi;
int linecnt, charcnt, inheader;
struct passwd *p;
unsigned char line[BUFSIZ];
/* Set effective uid to user in case mail drop is on nfs */
if ((p = getpwnam(user)) != NULL)
(void) setuid(p->pw_uid);
if ((fi = fopen(file, "r")) == NULL)
return;
(void)fseeko(fi, offset, SEEK_CUR);
/*
* Print the first 7 lines or 560 characters of the new mail
* (whichever comes first). Skip header crap other than
* From, Subject, To, and Date.
*/
linecnt = 7;
charcnt = 560;
inheader = 1;
while (fgets(line, sizeof(line), fi) != NULL) {
if (inheader) {
if (line[0] == '\n') {
inheader = 0;
continue;
}
if (line[0] == ' ' || line[0] == '\t' ||
(strncmp(line, "From:", 5) &&
strncmp(line, "Subject:", 8)))
continue;
}
if (linecnt <= 0 || charcnt <= 0) {
(void)fprintf(tp, "...more...%s", cr);
(void)fclose(fi);
return;
}
/* strip weird stuff so can't trojan horse stupid terminals */
for (cp = line; (ch = *cp) && ch != '\n'; ++cp, --charcnt) {
/* disable upper controls and enable all other
8bit codes due to lack of locale knowledge
*/
if (((ch & 0x80) && ch < 0xA0) ||
(!(ch & 0x80) && !isprint(ch) &&
!isspace(ch) && ch != '\a' && ch != '\b')
) {
if (ch & 0x80) {
ch &= ~0x80;
(void)fputs("M-", tp);
}
if (iscntrl(ch)) {
ch ^= 0x40;
(void)fputc('^', tp);
}
}
(void)fputc(ch, tp);
}
(void)fputs(cr, tp);
--linecnt;
}
(void)fprintf(tp, "----%s\n", cr);
(void)fclose(fi);
}