initial population

4 files changed, 571 insertions, 0 deletions

diff --git a/usr.bin/write/term_chk.c b/usr.bin/write/term_chk.c
new file mode 100644
index 0000000..d7d2cbe
--- /dev/null
+++ b/usr.bin/write/term_chk.c
@@ -0,0 +1,137 @@
+/* $NetBSD: term_chk.c,v 1.8 2009/04/14 07:59:17 lukem Exp $ */
+
+/*
+ * Copyright (c) 1989, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Jef Poskanzer and Craig Leres of the Lawrence Berkeley Laboratory.
+ *
+ * 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.
+ */
+
+#include <sys/cdefs.h>
+#ifndef lint
+__RCSID("$NetBSD: term_chk.c,v 1.8 2009/04/14 07:59:17 lukem Exp $");
+#endif
+
+#include <sys/types.h>
+#include <sys/param.h>
+#include <sys/stat.h>
+#include <time.h>
+#include <stdio.h>
+#include <errno.h>
+#include <unistd.h>
+#include <paths.h>
+#include <fcntl.h>
+#include <string.h>
+#include <err.h>
+
+#include "term_chk.h"
+
+/*
+ * term_chk - check that a terminal exists, and get the message bit
+ *     and the access time
+ */
+int
+term_chk(uid_t uid, const char *tty, int *msgsokP, time_t *atimeP, int ismytty,
+    gid_t saved_egid)
+{
+	char path[MAXPATHLEN];
+	struct stat s;
+	int i, fd, serrno;
+
+	if (strstr(tty, "../") != NULL) {
+		errno = EINVAL;
+		return -1;
+	}
+	i = snprintf(path, sizeof path, _PATH_DEV "%s", tty);
+	if (i < 0 || i >= (int)sizeof(path)) {
+		errno = ENOMEM;
+		return -1;
+	}
+
+	(void)setegid(saved_egid);
+	fd = open(path, O_WRONLY, 0);
+	serrno = errno;
+	(void)setegid(getgid());
+	errno = serrno;
+
+	if (fd == -1)
+		return(-1);
+	if (fstat(fd, &s) == -1)
+		goto error;
+	if (!isatty(fd))
+		goto error;
+	if (s.st_uid != uid && uid != 0) {
+		errno = EPERM;
+		goto error;
+	}
+	if (msgsokP)
+		*msgsokP = (s.st_mode & S_IWGRP) != 0;	/* group write bit */
+	if (atimeP)
+		*atimeP = s.st_atime;
+	if (ismytty)
+		(void)close(fd);
+	return ismytty ? 0 : fd;
+error:
+	if (fd != -1) {
+		serrno = errno;
+		(void)close(fd);
+		errno = serrno;
+	}
+	return -1;
+}
+
+char *
+check_sender(time_t *atime, uid_t myuid, gid_t saved_egid)
+{
+	int myttyfd;
+	int msgsok;
+	char *mytty;
+
+	/* check that sender has write enabled */
+	if (isatty(fileno(stdin)))
+		myttyfd = fileno(stdin);
+	else if (isatty(fileno(stdout)))
+		myttyfd = fileno(stdout);
+	else if (isatty(fileno(stderr)))
+		myttyfd = fileno(stderr);
+	else if (atime == NULL)
+		return NULL;
+	else
+		errx(1, "Cannot find your tty");
+	if ((mytty = ttyname(myttyfd)) == NULL)
+		err(1, "Cannot find the name of your tty");
+	if (strncmp(mytty, _PATH_DEV, sizeof(_PATH_DEV) - 1) == 0)
+		mytty += sizeof(_PATH_DEV) - 1;
+	if (term_chk(myuid, mytty, &msgsok, atime, 1, saved_egid) == -1)
+		err(1, "%s%s", _PATH_DEV, mytty);
+	if (!msgsok) {
+		warnx(
+		    "You have write permission turned off; no reply possible");
+	}
+	return mytty;
+}
diff --git a/usr.bin/write/term_chk.h b/usr.bin/write/term_chk.h
new file mode 100644
index 0000000..aca4568
--- /dev/null
+++ b/usr.bin/write/term_chk.h
@@ -0,0 +1,36 @@
+/*	$NetBSD: term_chk.h,v 1.2 2003/08/07 11:17:48 agc Exp $	*/
+
+/*
+ * Copyright (c) 1989, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Jef Poskanzer and Craig Leres of the Lawrence Berkeley Laboratory.
+ *
+ * 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.
+ */
+
+int term_chk(uid_t, const char *, int *, time_t *, int, gid_t);
+char *check_sender(time_t *, uid_t, gid_t);
diff --git a/usr.bin/write/write.1 b/usr.bin/write/write.1
new file mode 100644
index 0000000..28d614c
--- /dev/null
+++ b/usr.bin/write/write.1
@@ -0,0 +1,106 @@
+.\"	$NetBSD: write.1,v 1.6 2003/08/07 11:17:48 agc Exp $
+.\"
+.\" Copyright (c) 1989, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" This code is derived from software contributed to Berkeley by
+.\" Jef Poskanzer and Craig Leres of the Lawrence Berkeley Laboratory.
+.\"
+.\" 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.
+.\"
+.\"     from: @(#)write.1	8.1 (Berkeley) 6/6/93
+.\"
+.Dd June 6, 1993
+.Dt WRITE 1
+.Os
+.Sh NAME
+.Nm write
+.Nd send a message to another user
+.Sh SYNOPSIS
+.Nm
+.Ar user
+.Op Ar ttyname
+.Sh DESCRIPTION
+.Nm
+allows you to communicate with other users, by copying lines from
+your terminal to theirs.
+.Pp
+When you run the
+.Nm
+command, the user you are writing to gets a message of the form:
+.Pp
+.Dl Message from yourname@yourhost on yourtty at hh:mm ...
+.Pp
+Any further lines you enter will be copied to the specified user's
+terminal.
+If the other user wants to reply, they must run
+.Nm
+as well.
+.Pp
+When you are done, type an end-of-file or interrupt character.
+The other user will see the message
+.Ql EOF
+indicating that the
+conversation is over.
+.Pp
+You can prevent people (other than the super-user) from writing to you
+with the
+.Xr mesg 1
+command.
+Some commands, for example
+.Xr nroff 1
+and
+.Xr pr 1 ,
+disallow writing automatically, so that your output isn't overwritten.
+.Pp
+If the user you want to write to is logged in on more than one terminal,
+you can specify which terminal to write to by specifying the terminal
+name as the second operand to the
+.Nm
+command.
+Alternatively, you can let
+.Nm
+select one of the terminals \- it will pick the one with the shortest
+idle time.
+This is so that if the user is logged in at work and also dialed up from
+home, the message will go to the right place.
+.Pp
+The traditional protocol for writing to someone is that the string
+.Ql \-o ,
+either at the end of a line or on a line by itself, means that it's the
+other person's turn to talk.
+The string
+.Ql oo
+means that the person believes the conversation to be
+over.
+.Sh SEE ALSO
+.Xr mesg 1 ,
+.Xr talk 1 ,
+.Xr who 1
+.Sh HISTORY
+A
+.Nm
+command appeared in
+.At v6 .
diff --git a/usr.bin/write/write.c b/usr.bin/write/write.c
new file mode 100644
index 0000000..945e92f
--- /dev/null
+++ b/usr.bin/write/write.c
@@ -0,0 +1,292 @@
+/*	$NetBSD: write.c,v 1.27 2011/09/06 18:46:35 joerg Exp $	*/
+
+/*
+ * Copyright (c) 1989, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Jef Poskanzer and Craig Leres of the Lawrence Berkeley Laboratory.
+ *
+ * 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.
+ */
+
+#include <sys/cdefs.h>
+#ifndef lint
+__COPYRIGHT("@(#) Copyright (c) 1989, 1993\
+ The Regents of the University of California.  All rights reserved.");
+#endif /* not lint */
+
+#ifndef lint
+#if 0
+static char sccsid[] = "@(#)write.c	8.2 (Berkeley) 4/27/95";
+#else
+__RCSID("$NetBSD: write.c,v 1.27 2011/09/06 18:46:35 joerg Exp $");
+#endif
+#endif /* not lint */
+
+#include <sys/types.h>
+#include <sys/param.h>
+#include <sys/stat.h>
+#include <ctype.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <signal.h>
+#include <time.h>
+#include <fcntl.h>
+#include <paths.h>
+#include <pwd.h>
+#include <unistd.h>
+#include <err.h>
+#include <errno.h>
+
+#include "utmpentry.h"
+#include "term_chk.h"
+
+__dead static void done(int);
+static void do_write(int, const char *, const uid_t);
+static void wr_fputs(char *);
+static int search_utmp(char *, char *, uid_t, gid_t);
+static int utmp_chk(const char *, const char *);
+
+int
+main(int argc, char **argv)
+{
+	time_t atime;
+	uid_t myuid, uid;
+	int msgsok, ttyfd;
+	char *mytty;
+	gid_t saved_egid = getegid();
+
+	if (setegid(getgid()) == -1)
+		err(1, "setegid");
+	myuid = getuid();
+	ttyfd = -1;
+
+	mytty = check_sender(&atime, myuid, saved_egid);
+
+	/* check args */
+	switch (argc) {
+	case 2:
+		ttyfd = search_utmp(argv[1], mytty, myuid, saved_egid);
+		break;
+	case 3:
+		if (!strncmp(argv[2], _PATH_DEV, strlen(_PATH_DEV)))
+			argv[2] += strlen(_PATH_DEV);
+		if (uid_from_user(argv[1], &uid) == -1)
+			errx(1, "%s: unknown user", argv[1]);
+		if (utmp_chk(argv[1], argv[2]))
+			errx(1, "%s is not logged in on %s",
+			    argv[1], argv[2]);
+		ttyfd = term_chk(uid, argv[2], &msgsok, &atime, 0, saved_egid);
+		if (ttyfd == -1)
+			err(1, "%s%s", _PATH_DEV, argv[2]);
+		if (myuid && !msgsok)
+			errx(1, "%s has messages disabled on %s",
+			    argv[1], argv[2]);
+		break;
+	default:
+		(void)fprintf(stderr, "usage: write user [tty]\n");
+		exit(1);
+	}
+	if (setgid(getgid()) == -1)
+		err(1, "setgid");
+	do_write(ttyfd, mytty, myuid);
+	done(0);
+	/* NOTREACHED */
+#ifdef __GNUC__
+	return (0);
+#endif
+}
+
+/*
+ * utmp_chk - checks that the given user is actually logged in on
+ *     the given tty
+ */
+static int
+utmp_chk(const char *user, const char *tty)
+{
+	struct utmpentry *ep;
+
+	(void)getutentries(NULL, &ep);
+
+	for (; ep; ep = ep->next)
+		if (strcmp(user, ep->name) == 0 && strcmp(tty, ep->line) == 0)
+			return(0);
+	return(1);
+}
+
+/*
+ * search_utmp - search utmp for the "best" terminal to write to
+ *
+ * Ignores terminals with messages disabled, and of the rest, returns
+ * the one with the most recent access time.  Returns as value the number
+ * of the user's terminals with messages enabled, or -1 if the user is
+ * not logged in at all.
+ *
+ * Special case for writing to yourself - ignore the terminal you're
+ * writing from, unless that's the only terminal with messages enabled.
+ */
+static int
+search_utmp(char *user, char *mytty, uid_t myuid, gid_t saved_egid)
+{
+	char tty[MAXPATHLEN];
+	time_t bestatime, atime;
+	int nloggedttys, nttys, msgsok, user_is_me;
+	struct utmpentry *ep;
+	int fd, nfd;
+	uid_t uid;
+
+	if (uid_from_user(user, &uid) == -1)
+		errx(1, "%s: unknown user", user);
+
+	(void)getutentries(NULL, &ep);
+
+	nloggedttys = nttys = 0;
+	bestatime = 0;
+	user_is_me = 0;
+	fd = -1;
+	for (; ep; ep = ep->next)
+		if (strcmp(user, ep->name) == 0) {
+			++nloggedttys;
+			nfd = term_chk(uid, ep->line, &msgsok, &atime, 0,
+			    saved_egid);
+			if (nfd == -1)
+				continue;	/* bad term? skip */
+			if (myuid && !msgsok) {
+				close(nfd);
+				continue;	/* skip ttys with msgs off */
+			}
+			if (strcmp(ep->line, mytty) == 0) {
+				user_is_me = 1;
+				if (fd == -1)
+					fd = nfd;
+				else
+					close(nfd);
+				continue;	/* don't write to yourself */
+			}
+			++nttys;
+			if (atime > bestatime) {
+				bestatime = atime;
+				(void)strlcpy(tty, ep->line, sizeof(tty));
+				close(fd);
+				fd = nfd;
+			} else
+				close(nfd);
+		}
+
+	if (nloggedttys == 0)
+		errx(1, "%s is not logged in", user);
+	if (nttys == 0) {
+		if (user_is_me)			/* ok, so write to yourself! */
+			return fd;
+		errx(1, "%s has messages disabled", user);
+	} else if (nttys > 1)
+		warnx("%s is logged in more than once; writing to %s",
+		    user, tty);
+	return fd;
+}
+
+/*
+ * do_write - actually make the connection
+ */
+static void
+do_write(int ttyfd, const char *mytty, const uid_t myuid)
+{
+	const char *login;
+	char *nows;
+	struct passwd *pwd;
+	time_t now;
+	char host[MAXHOSTNAMELEN + 1], line[512];
+
+	/* Determine our login name before we re-open stdout */
+	if ((login = getlogin()) == NULL) {
+		if ((pwd = getpwuid(myuid)) != NULL)
+			login = pwd->pw_name;
+		else	login = "???";
+	}
+
+	if (dup2(ttyfd, STDOUT_FILENO) == -1)
+		err(1, "dup2");
+
+	(void)signal(SIGINT, done);
+	(void)signal(SIGHUP, done);
+	(void)close(ttyfd);
+
+	/* print greeting */
+	if (gethostname(host, sizeof(host)) < 0)
+		(void)strlcpy(host, "???", sizeof(host));
+	else
+		host[sizeof(host) - 1] = '\0';
+	now = time(NULL);
+	nows = ctime(&now);
+	nows[16] = '\0';
+	(void)printf("\r\n\a\a\aMessage from %s@%s on %s at %s ...\r\n",
+	    login, host, mytty, nows + 11);
+
+	while (fgets(line, sizeof(line), stdin) != NULL)
+		wr_fputs(line);
+}
+
+/*
+ * done - cleanup and exit
+ */
+static void
+done(int signo)
+{
+
+	(void)write(STDOUT_FILENO, "EOF\r\n", sizeof("EOF\r\n") - 1);
+	if (signo == 0)
+		exit(0);
+	else
+		_exit(0);
+}
+
+/*
+ * wr_fputs - like fputs(), but makes control characters visible and
+ *     turns \n into \r\n
+ */
+static void
+wr_fputs(char *s)
+{
+	unsigned char c;
+
+#define	PUTC(c)	if (putchar(c) == EOF) goto err;
+
+	for (; *s != '\0'; ++s) {
+		c = toascii(*s);
+		if (c == '\n') {
+			PUTC('\r');
+		} else if (!isprint(c) && !isspace(c) && c != '\a') {
+			PUTC('^');
+			c ^= 0x40;	/* DEL to ?, others to alpha */
+		}
+		PUTC(c);
+	}
+	return;
+
+err:	err(1, NULL);
+#undef PUTC
+}