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-rw-r--r--usr.bin/write/write.c328
1 files changed, 0 insertions, 328 deletions
diff --git a/usr.bin/write/write.c b/usr.bin/write/write.c
deleted file mode 100644
index 878c8c1..0000000
--- a/usr.bin/write/write.c
+++ /dev/null
@@ -1,328 +0,0 @@
-/*
- * 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. 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 const char copyright[] =
-"@(#) Copyright (c) 1989, 1993\n\
- The Regents of the University of California. All rights reserved.\n";
-#endif
-
-#if 0
-#ifndef lint
-static char sccsid[] = "@(#)write.c 8.1 (Berkeley) 6/6/93";
-#endif
-#endif
-
-#include <sys/cdefs.h>
-__FBSDID("$FreeBSD$");
-
-#include <sys/param.h>
-#include <sys/signal.h>
-#include <sys/stat.h>
-#include <sys/file.h>
-#include <sys/time.h>
-#include <ctype.h>
-#include <err.h>
-#include <locale.h>
-#include <paths.h>
-#include <pwd.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
-#include <utmp.h>
-
-void done(int);
-void do_write(char *, char *, uid_t);
-static void usage(void);
-int term_chk(char *, int *, time_t *, int);
-void wr_fputs(unsigned char *s);
-void search_utmp(char *, char *, char *, uid_t);
-int utmp_chk(char *, char *);
-
-int
-main(int argc, char **argv)
-{
- time_t atime;
- uid_t myuid;
- int msgsok, myttyfd;
- char tty[MAXPATHLEN], *mytty;
-
- (void)setlocale(LC_CTYPE, "");
-
- while (getopt(argc, argv, "") != -1)
- usage();
- argc -= optind;
- argv += optind;
-
- /* 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
- errx(1, "can't find your tty");
- if (!(mytty = ttyname(myttyfd)))
- errx(1, "can't find your tty's name");
- if (!strncmp(mytty, _PATH_DEV, strlen(_PATH_DEV)))
- mytty += strlen(_PATH_DEV);
- if (term_chk(mytty, &msgsok, &atime, 1))
- exit(1);
- if (!msgsok)
- errx(1, "you have write permission turned off");
-
- myuid = getuid();
-
- /* check args */
- switch (argc) {
- case 1:
- search_utmp(argv[0], tty, mytty, myuid);
- do_write(tty, mytty, myuid);
- break;
- case 2:
- if (!strncmp(argv[1], _PATH_DEV, strlen(_PATH_DEV)))
- argv[1] += strlen(_PATH_DEV);
- if (utmp_chk(argv[0], argv[1]))
- errx(1, "%s is not logged in on %s", argv[0], argv[1]);
- if (term_chk(argv[1], &msgsok, &atime, 1))
- exit(1);
- if (myuid && !msgsok)
- errx(1, "%s has messages disabled on %s", argv[0], argv[1]);
- do_write(argv[1], mytty, myuid);
- break;
- default:
- usage();
- }
- done(0);
- return (0);
-}
-
-static void
-usage(void)
-{
- (void)fprintf(stderr, "usage: write user [tty]\n");
- exit(1);
-}
-
-/*
- * utmp_chk - checks that the given user is actually logged in on
- * the given tty
- */
-int
-utmp_chk(char *user, char *tty)
-{
- struct utmp u;
- int ufd;
-
- if ((ufd = open(_PATH_UTMP, O_RDONLY)) < 0)
- return(0); /* ignore error, shouldn't happen anyway */
-
- while (read(ufd, (char *) &u, sizeof(u)) == sizeof(u))
- if (strncmp(user, u.ut_name, sizeof(u.ut_name)) == 0 &&
- strncmp(tty, u.ut_line, sizeof(u.ut_line)) == 0) {
- (void)close(ufd);
- return(0);
- }
-
- (void)close(ufd);
- 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.
- */
-void
-search_utmp(char *user, char *tty, char *mytty, uid_t myuid)
-{
- struct utmp u;
- time_t bestatime, atime;
- int ufd, nloggedttys, nttys, msgsok, user_is_me;
- char atty[UT_LINESIZE + 1];
-
- if ((ufd = open(_PATH_UTMP, O_RDONLY)) < 0)
- err(1, "utmp");
-
- nloggedttys = nttys = 0;
- bestatime = 0;
- user_is_me = 0;
- while (read(ufd, (char *) &u, sizeof(u)) == sizeof(u))
- if (strncmp(user, u.ut_name, sizeof(u.ut_name)) == 0) {
- ++nloggedttys;
- (void)strncpy(atty, u.ut_line, UT_LINESIZE);
- atty[UT_LINESIZE] = '\0';
- if (term_chk(atty, &msgsok, &atime, 0))
- continue; /* bad term? skip */
- if (myuid && !msgsok)
- continue; /* skip ttys with msgs off */
- if (strcmp(atty, mytty) == 0) {
- user_is_me = 1;
- continue; /* don't write to yourself */
- }
- ++nttys;
- if (atime > bestatime) {
- bestatime = atime;
- (void)strcpy(tty, atty);
- }
- }
-
- (void)close(ufd);
- if (nloggedttys == 0)
- errx(1, "%s is not logged in", user);
- if (nttys == 0) {
- if (user_is_me) { /* ok, so write to yourself! */
- (void)strcpy(tty, mytty);
- return;
- }
- errx(1, "%s has messages disabled", user);
- } else if (nttys > 1) {
- warnx("%s is logged in more than once; writing to %s", user, tty);
- }
-}
-
-/*
- * term_chk - check that a terminal exists, and get the message bit
- * and the access time
- */
-int
-term_chk(char *tty, int *msgsokP, time_t *atimeP, int showerror)
-{
- struct stat s;
- char path[MAXPATHLEN];
-
- (void)snprintf(path, sizeof(path), "%s%s", _PATH_DEV, tty);
- if (stat(path, &s) < 0) {
- if (showerror)
- warn("%s", path);
- return(1);
- }
- *msgsokP = (s.st_mode & (S_IWRITE >> 3)) != 0; /* group write bit */
- *atimeP = s.st_atime;
- return(0);
-}
-
-/*
- * do_write - actually make the connection
- */
-void
-do_write(char *tty, char *mytty, uid_t myuid)
-{
- const char *login;
- char *nows;
- struct passwd *pwd;
- time_t now;
- char path[MAXPATHLEN], host[MAXHOSTNAMELEN], line[512];
-
- /* Determine our login name before we reopen() stdout */
- if ((login = getlogin()) == NULL) {
- if ((pwd = getpwuid(myuid)))
- login = pwd->pw_name;
- else
- login = "???";
- }
-
- (void)snprintf(path, sizeof(path), "%s%s", _PATH_DEV, tty);
- if ((freopen(path, "w", stdout)) == NULL)
- err(1, "%s", path);
-
- (void)signal(SIGINT, done);
- (void)signal(SIGHUP, done);
-
- /* print greeting */
- if (gethostname(host, sizeof(host)) < 0)
- (void)strcpy(host, "???");
- now = time((time_t *)NULL);
- nows = ctime(&now);
- nows[16] = '\0';
- (void)printf("\r\n\007\007\007Message 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
- */
-void
-done(int n __unused)
-{
- (void)printf("EOF\r\n");
- exit(0);
-}
-
-/*
- * wr_fputs - like fputs(), but makes control characters visible and
- * turns \n into \r\n
- */
-void
-wr_fputs(unsigned char *s)
-{
-
-#define PUTC(c) if (putchar(c) == EOF) err(1, NULL);
-
- for (; *s != '\0'; ++s) {
- if (*s == '\n') {
- PUTC('\r');
- } else if (((*s & 0x80) && *s < 0xA0) ||
- /* disable upper controls */
- (!isprint(*s) && !isspace(*s) &&
- *s != '\a' && *s != '\b')
- ) {
- if (*s & 0x80) {
- *s &= ~0x80;
- PUTC('M');
- PUTC('-');
- }
- if (iscntrl(*s)) {
- *s ^= 0x40;
- PUTC('^');
- }
- }
- PUTC(*s);
- }
- return;
-#undef PUTC
-}
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