mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-22 11:17:19 +00:00
0de6400b1c
Submitted by: amdmi3 PR: bin/164317
312 lines
7.7 KiB
C
312 lines
7.7 KiB
C
/*
|
|
* 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.
|
|
* 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 <utmpx.h>
|
|
#include <wchar.h>
|
|
#include <wctype.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(wchar_t *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 utmpx lu, *u;
|
|
|
|
strncpy(lu.ut_line, tty, sizeof lu.ut_line);
|
|
setutxent();
|
|
while ((u = getutxline(&lu)) != NULL)
|
|
if (u->ut_type == USER_PROCESS &&
|
|
strcmp(user, u->ut_user) == 0) {
|
|
endutxent();
|
|
return(0);
|
|
}
|
|
endutxent();
|
|
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 utmpx *u;
|
|
time_t bestatime, atime;
|
|
int nloggedttys, nttys, msgsok, user_is_me;
|
|
|
|
nloggedttys = nttys = 0;
|
|
bestatime = 0;
|
|
user_is_me = 0;
|
|
|
|
setutxent();
|
|
while ((u = getutxent()) != NULL)
|
|
if (u->ut_type == USER_PROCESS &&
|
|
strcmp(user, u->ut_user) == 0) {
|
|
++nloggedttys;
|
|
if (term_chk(u->ut_line, &msgsok, &atime, 0))
|
|
continue; /* bad term? skip */
|
|
if (myuid && !msgsok)
|
|
continue; /* skip ttys with msgs off */
|
|
if (strcmp(u->ut_line, mytty) == 0) {
|
|
user_is_me = 1;
|
|
continue; /* don't write to yourself */
|
|
}
|
|
++nttys;
|
|
if (atime > bestatime) {
|
|
bestatime = atime;
|
|
(void)strlcpy(tty, u->ut_line, MAXPATHLEN);
|
|
}
|
|
}
|
|
endutxent();
|
|
|
|
if (nloggedttys == 0)
|
|
errx(1, "%s is not logged in", user);
|
|
if (nttys == 0) {
|
|
if (user_is_me) { /* ok, so write to yourself! */
|
|
(void)strlcpy(tty, mytty, MAXPATHLEN);
|
|
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];
|
|
wchar_t 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 (fgetws(line, sizeof(line)/sizeof(wchar_t), 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(wchar_t *s)
|
|
{
|
|
|
|
#define PUTC(c) if (putwchar(c) == WEOF) err(1, NULL);
|
|
|
|
for (; *s != L'\0'; ++s) {
|
|
if (*s == L'\n') {
|
|
PUTC(L'\r');
|
|
PUTC(L'\n');
|
|
} else if (iswprint(*s) || iswspace(*s)) {
|
|
PUTC(*s);
|
|
} else {
|
|
wprintf(L"<0x%X>", *s);
|
|
}
|
|
}
|
|
return;
|
|
#undef PUTC
|
|
}
|