2
* Copyright (c) 1989, 1993
3
* The Regents of the University of California. All rights reserved.
5
* This code is derived from software contributed to Berkeley by
6
* Jef Poskanzer and Craig Leres of the Lawrence Berkeley Laboratory.
8
* Redistribution and use in source and binary forms, with or without
9
* modification, are permitted provided that the following conditions
11
* 1. Redistributions of source code must retain the above copyright
12
* notice, this list of conditions and the following disclaimer.
13
* 2. Redistributions in binary form must reproduce the above copyright
14
* notice, this list of conditions and the following disclaimer in the
15
* documentation and/or other materials provided with the distribution.
16
* 3. All advertising materials mentioning features or use of this software
17
* must display the following acknowledgement:
18
* This product includes software developed by the University of
19
* California, Berkeley and its contributors.
20
* 4. Neither the name of the University nor the names of its contributors
21
* may be used to endorse or promote products derived from this software
22
* without specific prior written permission.
24
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36
* Modified for Linux, Mon Mar 8 18:16:24 1993, faith@cs.unc.edu
37
* Wed Jun 22 21:41:56 1994, faith@cs.unc.edu:
38
* Added fix from Mike Grupenhoff (kashmir@umiacs.umd.edu)
39
* Mon Jul 1 17:01:39 MET DST 1996, janl@math.uio.no:
40
* - Added fix from David.Chapell@mail.trincoll.edu enabeling daemons
42
* - ANSIed it since I was working on it anyway.
43
* 1999-02-22 Arkadiusz Mi�kiewicz <misiek@pld.ORG.PL>
44
* - added Native Language Support
58
#include <sys/param.h>
63
#include "pathnames.h"
64
#include "carefulputc.h"
67
void search_utmp(char *, char *, char *, uid_t);
68
void do_write(char *, char *, uid_t);
69
void wr_fputs(char *);
70
static void done(int);
71
int term_chk(char *, int *, time_t *, int);
72
int utmp_chk(char *, char *);
77
main(int argc, char **argv) {
81
char tty[MAXPATHLEN], *mytty;
83
setlocale(LC_ALL, "");
84
bindtextdomain(PACKAGE, LOCALEDIR);
89
/* check that sender has write enabled */
90
if (isatty(fileno(stdin)))
91
myttyfd = fileno(stdin);
92
else if (isatty(fileno(stdout)))
93
myttyfd = fileno(stdout);
94
else if (isatty(fileno(stderr)))
95
myttyfd = fileno(stderr);
100
if (!(mytty = ttyname(myttyfd))) {
101
(void)fprintf(stderr, _("write: can't find your tty's name\n"));
104
/* We may have /dev/ttyN but also /dev/pts/xx.
105
Below, term_chk() will put "/dev/" in front, so remove that part. */
106
if (!strncmp(mytty, "/dev/", 5))
108
if (term_chk(mytty, &msgsok, &atime, 1))
111
(void)fprintf(stderr,
112
_("write: you have write permission turned off.\n"));
125
search_utmp(argv[1], tty, mytty, myuid);
126
do_write(tty, mytty, myuid);
129
if (!strncmp(argv[2], "/dev/", 5))
131
if (utmp_chk(argv[1], argv[2])) {
132
(void)fprintf(stderr,
133
_("write: %s is not logged in on %s.\n"),
137
if (term_chk(argv[2], &msgsok, &atime, 1))
139
if (myuid && !msgsok) {
140
(void)fprintf(stderr,
141
_("write: %s has messages disabled on %s\n"),
145
do_write(argv[2], mytty, myuid);
148
(void)fprintf(stderr, _("usage: write user [tty]\n"));
158
* utmp_chk - checks that the given user is actually logged in on
161
int utmp_chk(char *user, char *tty)
168
utmpname(_PATH_UTMP);
171
while ((uptr = getutent())) {
172
memcpy(&u, uptr, sizeof(u));
173
if (strncmp(user, u.ut_name, sizeof(u.ut_name)) == 0 &&
174
strncmp(tty, u.ut_line, sizeof(u.ut_line)) == 0) {
185
* search_utmp - search utmp for the "best" terminal to write to
187
* Ignores terminals with messages disabled, and of the rest, returns
188
* the one with the most recent access time. Returns as value the number
189
* of the user's terminals with messages enabled, or -1 if the user is
190
* not logged in at all.
192
* Special case for writing to yourself - ignore the terminal you're
193
* writing from, unless that's the only terminal with messages enabled.
195
void search_utmp(char *user, char *tty, char *mytty, uid_t myuid)
200
time_t bestatime, atime;
201
int nloggedttys, nttys, msgsok, user_is_me;
202
char atty[sizeof(u.ut_line) + 1];
204
utmpname(_PATH_UTMP);
207
nloggedttys = nttys = 0;
210
while ((uptr = getutent())) {
211
memcpy(&u, uptr, sizeof(u));
212
if (strncmp(user, u.ut_name, sizeof(u.ut_name)) == 0) {
214
(void)strncpy(atty, u.ut_line, sizeof(u.ut_line));
215
atty[sizeof(u.ut_line)] = '\0';
216
if (term_chk(atty, &msgsok, &atime, 0))
217
continue; /* bad term? skip */
218
if (myuid && !msgsok)
219
continue; /* skip ttys with msgs off */
220
if (strcmp(atty, mytty) == 0) {
222
continue; /* don't write to yourself */
224
if (u.ut_type != USER_PROCESS)
225
continue; /* it's not a valid entry */
227
if (atime > bestatime) {
229
(void)strcpy(tty, atty);
235
if (nloggedttys == 0) {
236
(void)fprintf(stderr, _("write: %s is not logged in\n"), user);
240
if (user_is_me) { /* ok, so write to yourself! */
241
(void)strcpy(tty, mytty);
244
(void)fprintf(stderr,
245
_("write: %s has messages disabled\n"), user);
247
} else if (nttys > 1) {
248
(void)fprintf(stderr,
249
_("write: %s is logged in more than once; writing to %s\n"),
255
* term_chk - check that a terminal exists, and get the message bit
256
* and the access time
258
int term_chk(char *tty, int *msgsokP, time_t *atimeP, int showerror)
262
char path[MAXPATHLEN];
264
if (strlen(tty) + 6 > sizeof(path))
266
(void)sprintf(path, "/dev/%s", tty);
267
if (stat(path, &s) < 0) {
269
(void)fprintf(stderr,
270
"write: %s: %s\n", path, strerror(errno));
274
/* group write bit and group ownership */
275
*msgsokP = (s.st_mode & (S_IWRITE >> 3)) && myegid == s.st_gid;
276
*atimeP = s.st_atime;
281
* do_write - actually make the connection
283
void do_write(char *tty, char *mytty, uid_t myuid) {
284
char *login, *pwuid, *nows;
287
char path[MAXPATHLEN], host[MAXHOSTNAMELEN], line[512];
289
/* Determine our login name(s) before the we reopen() stdout */
290
if ((pwd = getpwuid(myuid)) != NULL)
291
pwuid = pwd->pw_name;
294
if ((login = getlogin()) == NULL)
297
if (strlen(tty) + 6 > sizeof(path))
299
(void)sprintf(path, "/dev/%s", tty);
300
if ((freopen(path, "w", stdout)) == NULL) {
301
(void)fprintf(stderr, "write: %s: %s\n",
302
path, strerror(errno));
306
(void)signal(SIGINT, done);
307
(void)signal(SIGHUP, done);
310
if (gethostname(host, sizeof(host)) < 0)
311
(void)strcpy(host, "???");
312
now = time((time_t *)NULL);
315
printf("\r\n\007\007\007");
316
if (strcmp(login, pwuid))
317
(void)printf(_("Message from %s@%s (as %s) on %s at %s ..."),
318
login, host, pwuid, mytty, nows + 11);
320
(void)printf(_("Message from %s@%s on %s at %s ..."),
321
login, host, mytty, nows + 11);
324
while (fgets(line, sizeof(line), stdin) != NULL)
329
* done - cleanup and exit
333
(void)printf("EOF\r\n");
338
* wr_fputs - like fputs(), but makes control characters visible and
339
* turns \n into \r\n.
345
#define PUTC(c) if (carefulputc(c,stdout) == EOF) goto err;
356
fprintf(stderr, "write: %s\n", strerror(errno));
added
removed
misc-utils/write.c
