BSD 4.4 Lite Libexec Sources

1 files changed, 284 insertions, 0 deletions

diff --git a/libexec/comsat/comsat.c b/libexec/comsat/comsat.c
new file mode 100644
index 000000000000..e2e44773b34c
--- /dev/null
+++ b/libexec/comsat/comsat.c
@@ -0,0 +1,284 @@
+/*
+ * 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. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Berkeley and its contributors.
+ * 4. 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 char copyright[] =
+"@(#) Copyright (c) 1980, 1993\n\
+	The Regents of the University of California.  All rights reserved.\n";
+#endif /* not lint */
+
+#ifndef lint
+static char sccsid[] = "@(#)comsat.c	8.1 (Berkeley) 6/4/93";
+#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 <errno.h>
+#include <netdb.h>
+#include <paths.h>
+#include <pwd.h>
+#include <sgtty.h>
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <syslog.h>
+#include <unistd.h>
+#include <utmp.h>
+
+int	debug = 0;
+#define	dsyslog	if (debug) syslog
+
+#define MAXIDLE	120
+
+char	hostname[MAXHOSTNAMELEN];
+struct	utmp *utmp = NULL;
+time_t	lastmsgtime;
+int	nutmp, uf;
+
+void jkfprintf __P((FILE *, char[], off_t));
+void mailfor __P((char *));
+void notify __P((struct utmp *, off_t));
+void onalrm __P((int));
+void reapchildren __P((int));
+
+int
+main(argc, argv)
+	int argc;
+	char *argv[];
+{
+	struct sockaddr_in from;
+	register int cc;
+	int fromlen;
+	char msgbuf[100];
+
+	/* verify proper invocation */
+	fromlen = sizeof(from);
+	if (getsockname(0, (struct sockaddr *)&from, &fromlen) < 0) {
+		(void)fprintf(stderr,
+		    "comsat: getsockname: %s.\n", strerror(errno));
+		exit(1);
+	}
+	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);
+	}
+	if ((uf = open(_PATH_UTMP, O_RDONLY, 0)) < 0) {
+		syslog(LOG_ERR, "open: %s: %m", _PATH_UTMP);
+		(void) recv(0, msgbuf, sizeof(msgbuf) - 1, 0);
+		exit(1);
+	}
+	(void)time(&lastmsgtime);
+	(void)gethostname(hostname, sizeof(hostname));
+	onalrm(0);
+	(void)signal(SIGALRM, onalrm);
+	(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;
+		}
+		if (!nutmp)		/* no one has logged in yet */
+			continue;
+		sigblock(sigmask(SIGALRM));
+		msgbuf[cc] = '\0';
+		(void)time(&lastmsgtime);
+		mailfor(msgbuf);
+		sigsetmask(0L);
+	}
+}
+
+void
+reapchildren(signo)
+	int signo;
+{
+	while (wait3(NULL, WNOHANG, NULL) > 0);
+}
+
+void
+onalrm(signo)
+	int signo;
+{
+	static u_int utmpsize;		/* last malloced size for utmp */
+	static u_int utmpmtime;		/* last modification time for utmp */
+	struct stat statbf;
+
+	if (time(NULL) - lastmsgtime >= MAXIDLE)
+		exit(0);
+	(void)alarm((u_int)15);
+	(void)fstat(uf, &statbf);
+	if (statbf.st_mtime > utmpmtime) {
+		utmpmtime = statbf.st_mtime;
+		if (statbf.st_size > utmpsize) {
+			utmpsize = statbf.st_size + 10 * sizeof(struct utmp);
+			if ((utmp = realloc(utmp, utmpsize)) == NULL) {
+				syslog(LOG_ERR, "%s", strerror(errno));
+				exit(1);
+			}
+		}
+		(void)lseek(uf, (off_t)0, L_SET);
+		nutmp = read(uf, utmp, (int)statbf.st_size)/sizeof(struct utmp);
+	}
+}
+
+void
+mailfor(name)
+	char *name;
+{
+	register struct utmp *utp = &utmp[nutmp];
+	register char *cp;
+	off_t offset;
+
+	if (!(cp = strchr(name, '@')))
+		return;
+	*cp = '\0';
+	offset = atoi(cp + 1);
+	while (--utp >= utmp)
+		if (!strncmp(utp->ut_name, name, sizeof(utmp[0].ut_name)))
+			notify(utp, offset);
+}
+
+static char *cr;
+
+void
+notify(utp, offset)
+	register struct utmp *utp;
+	off_t offset;
+{
+	FILE *tp;
+	struct stat stb;
+	struct sgttyb gttybuf;
+	char tty[20], name[sizeof(utmp[0].ut_name) + 1];
+
+	(void)snprintf(tty, sizeof(tty), "%s%.*s",
+	    _PATH_DEV, (int)sizeof(utp->ut_line), utp->ut_line);
+	if (strchr(tty + sizeof(_PATH_DEV) - 1, '/')) {
+		/* A slash is an attempt to break security... */
+		syslog(LOG_AUTH | LOG_NOTICE, "'/' in \"%s\"", tty);
+		return;
+	}
+	if (stat(tty, &stb) || !(stb.st_mode & S_IEXEC)) {
+		dsyslog(LOG_DEBUG, "%s: wrong mode on %s", utp->ut_name, tty);
+		return;
+	}
+	dsyslog(LOG_DEBUG, "notify %s on %s\n", utp->ut_name, tty);
+	if (fork())
+		return;
+	(void)signal(SIGALRM, SIG_DFL);
+	(void)alarm((u_int)30);
+	if ((tp = fopen(tty, "w")) == NULL) {
+		dsyslog(LOG_ERR, "%s: %s", tty, strerror(errno));
+		_exit(-1);
+	}
+	(void)ioctl(fileno(tp), TIOCGETP, &gttybuf);
+	cr = (gttybuf.sg_flags&CRMOD) && !(gttybuf.sg_flags&RAW) ?
+	    "\n" : "\n\r";
+	(void)strncpy(name, utp->ut_name, sizeof(utp->ut_name));
+	name[sizeof(name) - 1] = '\0';
+	(void)fprintf(tp, "%s\007New mail for %s@%.*s\007 has arrived:%s----%s",
+	    cr, name, (int)sizeof(hostname), hostname, cr, cr);
+	jkfprintf(tp, name, offset);
+	(void)fclose(tp);
+	_exit(0);
+}
+
+void
+jkfprintf(tp, name, offset)
+	register FILE *tp;
+	char name[];
+	off_t offset;
+{
+	register char *cp, ch;
+	register FILE *fi;
+	register int linecnt, charcnt, inheader;
+	register struct passwd *p;
+	char line[BUFSIZ];
+
+	/* Set effective uid to user in case mail drop is on nfs */
+	if ((p = getpwnam(name)) != NULL)
+		(void) setuid(p->pw_uid);
+
+	if ((fi = fopen(name, "r")) == NULL)
+		return;
+
+	(void)fseek(fi, offset, L_SET);
+	/*
+	 * 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) {
+			ch = toascii(ch);
+			if (!isprint(ch) && !isspace(ch))
+				ch |= 0x40;
+			(void)fputc(ch, tp);
+		}
+		(void)fputs(cr, tp);
+		--linecnt;
+	}
+	(void)fprintf(tp, "----%s\n", cr);
+	(void)fclose(fi);
+}