318 lines
8.5 KiB
C
318 lines
8.5 KiB
C
/*
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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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. 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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* $Id: comsat.c,v 1.9 1997/09/15 00:27:49 ache Exp $
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*/
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#ifndef lint
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static 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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static char sccsid[] = "@(#)comsat.c 8.1 (Berkeley) 6/4/93";
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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 <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 <utmp.h>
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int debug = 0;
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#define dsyslog if (debug) syslog
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#define MAXIDLE 120
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char hostname[MAXHOSTNAMELEN];
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struct utmp *utmp = NULL;
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time_t lastmsgtime;
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int nutmp, uf;
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void jkfprintf __P((FILE *, char[], char[], off_t));
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void mailfor __P((char *));
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void notify __P((struct utmp *, char[], off_t, int));
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void onalrm __P((int));
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void reapchildren __P((int));
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int
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main(argc, argv)
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int argc;
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char *argv[];
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{
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struct sockaddr_in from;
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register int cc;
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int fromlen;
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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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(void)fprintf(stderr,
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"comsat: getsockname: %s.\n", strerror(errno));
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exit(1);
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}
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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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if ((uf = open(_PATH_UTMP, O_RDONLY, 0)) < 0) {
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syslog(LOG_ERR, "open: %s: %m", _PATH_UTMP);
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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)time(&lastmsgtime);
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(void)gethostname(hostname, sizeof(hostname));
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onalrm(0);
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(void)signal(SIGALRM, onalrm);
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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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if (!nutmp) /* no one has logged in yet */
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continue;
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sigblock(sigmask(SIGALRM));
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msgbuf[cc] = '\0';
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(void)time(&lastmsgtime);
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mailfor(msgbuf);
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sigsetmask(0L);
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}
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}
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void
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reapchildren(signo)
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int signo;
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{
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while (wait3(NULL, WNOHANG, NULL) > 0);
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}
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void
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onalrm(signo)
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int signo;
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{
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static u_int utmpsize; /* last malloced size for utmp */
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static u_int utmpmtime; /* last modification time for utmp */
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struct stat statbf;
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if (time(NULL) - lastmsgtime >= MAXIDLE)
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exit(0);
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(void)alarm((u_int)15);
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(void)fstat(uf, &statbf);
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if (statbf.st_mtime > utmpmtime) {
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utmpmtime = statbf.st_mtime;
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if (statbf.st_size > utmpsize) {
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utmpsize = statbf.st_size + 10 * sizeof(struct utmp);
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if ((utmp = realloc(utmp, utmpsize)) == NULL) {
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syslog(LOG_ERR, "%s", strerror(errno));
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exit(1);
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}
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}
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(void)lseek(uf, (off_t)0, L_SET);
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nutmp = read(uf, utmp, (int)statbf.st_size)/sizeof(struct utmp);
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}
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}
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void
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mailfor(name)
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char *name;
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{
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register struct utmp *utp = &utmp[nutmp];
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register 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(utmp[0].ut_name) + 1];
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char buf2[sizeof(_PATH_MAILDIR) + sizeof(utmp[0].ut_name) + 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 = atoi(cp + 1);
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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, sizeof(utmp[0].ut_name), name);
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if (*file != '/') {
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sprintf(buf2, "%s/%.*s", _PATH_MAILDIR, sizeof(utmp[0].ut_name), file);
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file = buf2;
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}
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folder = strcmp(buf, file);
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while (--utp >= utmp)
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if (!strncmp(utp->ut_name, name, sizeof(utmp[0].ut_name)))
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notify(utp, file, offset, folder);
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}
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static char *cr;
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void
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notify(utp, file, offset, folder)
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register struct utmp *utp;
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char file[];
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off_t offset;
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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], name[sizeof(utmp[0].ut_name) + 1];
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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 (strchr(tty + sizeof(_PATH_DEV) - 1, '/')) {
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/* A slash is an attempt to break security... */
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syslog(LOG_AUTH | LOG_NOTICE, "'/' in \"%s\"", tty);
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return;
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}
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if (stat(tty, &stb) || !(stb.st_mode & S_IEXEC)) {
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dsyslog(LOG_DEBUG, "%s: wrong mode on %s", utp->ut_name, tty);
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return;
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}
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dsyslog(LOG_DEBUG, "notify %s on %s\n", utp->ut_name, tty);
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if (fork())
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return;
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(void)signal(SIGALRM, SIG_DFL);
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(void)alarm((u_int)30);
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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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(void)strncpy(name, utp->ut_name, sizeof(utp->ut_name));
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name[sizeof(name) - 1] = '\0';
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(void)fprintf(tp, "%s\007New mail for %s@%.*s\007 has arrived%s%s%s:%s----%s",
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cr, name, (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, name, file, offset);
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(void)fclose(tp);
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_exit(0);
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}
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void
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jkfprintf(tp, user, file, offset)
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register FILE *tp;
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char user[];
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char file[];
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off_t offset;
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{
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register unsigned char *cp, ch;
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register FILE *fi;
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register int linecnt, charcnt, inheader;
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register 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)fseek(fi, offset, L_SET);
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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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