* Modified for Linux, Mon Mar 8 18:16:24 1993, faith@cs.unc.edu
* Wed Jun 22 21:41:56 1994, faith@cs.unc.edu:
* Added fix from Mike Grupenhoff (kashmir@umiacs.umd.edu)
- *
+ * Mon Jul 1 17:01:39 MET DST 1996, janl@math.uio.no:
+ * - Added fix from David.Chapell@mail.trincoll.edu enabeling daemons
+ * to use write.
+ * - ANSIed it since I was working on it anyway.
*/
#ifndef lint
static char sccsid[] = "@(#)write.c 8.1 (Berkeley) 6/6/93";
#endif /* not lint */
-#include <sys/param.h>
-#include <sys/signal.h>
-#include <sys/stat.h>
-#include <sys/file.h>
-#include <sys/time.h>
+#define _GNU_SOURCE /* for snprintf */
+
+#include <unistd.h>
#include <utmp.h>
#include <ctype.h>
#include <pwd.h>
#include <stdio.h>
#include <string.h>
+#include <sys/param.h>
+#include <sys/signal.h>
+#include <sys/stat.h>
+#include <sys/file.h>
+#include <sys/time.h>
#ifdef __linux__
#include <paths.h>
#include "pathnames.h"
#include <locale.h>
#endif
+void search_utmp(char *, char *, char *, uid_t);
+void do_write(char *, char *, uid_t);
+void wr_fputs(char *);
+int term_chk(char *, int *, time_t *, int);
+int utmp_chk(char *, char *);
+
extern int errno;
-main(argc, argv)
- int argc;
- char **argv;
+void
+main(int argc, char **argv)
{
register char *cp;
time_t atime;
else if (isatty(fileno(stderr)))
myttyfd = fileno(stderr);
else {
- (void)fprintf(stderr, "write: can't find your tty\n");
- exit(1);
+ myttyfd = -1;
}
- if (!(mytty = ttyname(myttyfd))) {
+ if (myttyfd != -1) {
+ if (!(mytty = ttyname(myttyfd))) {
(void)fprintf(stderr, "write: can't find your tty's name\n");
exit(1);
- }
- if (cp = rindex(mytty, '/'))
+ }
+ if ((cp = rindex(mytty, '/')) != NULL)
mytty = cp + 1;
- if (term_chk(mytty, &msgsok, &atime, 1))
+ if (term_chk(mytty, &msgsok, &atime, 1))
exit(1);
- if (!msgsok) {
+ if (!msgsok) {
(void)fprintf(stderr,
"write: you have write permission turned off.\n");
exit(1);
+ }
+
+ } else {
+ mytty = "<no tty>";
}
myuid = getuid();
/* NOTREACHED */
}
+
/*
* utmp_chk - checks that the given user is actually logged in on
* the given tty
*/
-utmp_chk(user, tty)
- char *user, *tty;
+int utmp_chk(char *user, char *tty)
+
{
struct utmp u;
- int ufd;
+ struct utmp *uptr;
+ int res = 1;
- if ((ufd = open(_PATH_UTMP, O_RDONLY)) < 0)
- return(0); /* ignore error, shouldn't happen anyway */
+ utmpname(_PATH_UTMP);
+ setutent();
- while (read(ufd, (char *) &u, sizeof(u)) == sizeof(u))
+ while ((uptr = getutent())) {
+ memcpy(&u, uptr, 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);
+ res = 0;
+ break;
}
+ }
- (void)close(ufd);
- return(1);
+ endutent();
+ return(res);
}
/*
* Special case for writing to yourself - ignore the terminal you're
* writing from, unless that's the only terminal with messages enabled.
*/
-search_utmp(user, tty, mytty, myuid)
- char *user, *tty, *mytty;
- uid_t myuid;
+void search_utmp(char *user, char *tty, char *mytty, uid_t myuid)
+
{
struct utmp u;
+ struct utmp *uptr;
time_t bestatime, atime;
- int ufd, nloggedttys, nttys, msgsok, user_is_me;
+ int nloggedttys, nttys, msgsok, user_is_me;
#ifdef __linux__
char atty[sizeof(u.ut_line) + 1];
#else
char atty[UT_LINESIZE + 1];
#endif
- if ((ufd = open(_PATH_UTMP, O_RDONLY)) < 0) {
- perror("utmp");
- exit(1);
- }
+ utmpname(_PATH_UTMP);
+ setutent();
nloggedttys = nttys = 0;
bestatime = 0;
user_is_me = 0;
- while (read(ufd, (char *) &u, sizeof(u)) == sizeof(u))
+ while ((uptr = getutent())) {
+ memcpy(&u, uptr, sizeof(u));
if (strncmp(user, u.ut_name, sizeof(u.ut_name)) == 0) {
++nloggedttys;
#ifdef __linux__
(void)strcpy(tty, atty);
}
}
+ }
- (void)close(ufd);
+ endutent();
if (nloggedttys == 0) {
(void)fprintf(stderr, "write: %s is not logged in\n", user);
exit(1);
* term_chk - check that a terminal exists, and get the message bit
* and the access time
*/
-term_chk(tty, msgsokP, atimeP, showerror)
- char *tty;
- int *msgsokP, showerror;
- time_t *atimeP;
+int term_chk(char *tty, int *msgsokP, time_t *atimeP, int showerror)
+
{
struct stat s;
char path[MAXPATHLEN];
- (void)sprintf(path, "/dev/%s", tty);
+ (void)snprintf(path, sizeof(path), "/dev/%s", tty);
if (stat(path, &s) < 0) {
if (showerror)
(void)fprintf(stderr,
/*
* do_write - actually make the connection
*/
-do_write(tty, mytty, myuid)
- char *tty, *mytty;
- uid_t myuid;
+void do_write(char *tty, char *mytty, uid_t myuid)
+
{
register char *login, *nows;
register struct passwd *pwd;
/* Determine our login name before the we reopen() stdout */
if ((login = getlogin()) == NULL)
- if (pwd = getpwuid(myuid))
+ if ((pwd = getpwuid(myuid)) != NULL)
login = pwd->pw_name;
else
login = "???";
- (void)sprintf(path, "/dev/%s", tty);
+ (void)snprintf(path, sizeof(path), "/dev/%s", tty);
if ((freopen(path, "w", stdout)) == NULL) {
(void)fprintf(stderr, "write: %s: %s\n", path, strerror(errno));
exit(1);
/*
* done - cleanup and exit
*/
-void
-done()
+void done(void)
{
(void)printf("EOF\r\n");
exit(0);
* wr_fputs - like fputs(), but makes control characters visible and
* turns \n into \r\n
*/
-wr_fputs(s)
- register char *s;
+void wr_fputs(char *s)
+
{
- register char c;
+ char c;
#define PUTC(c) if (putchar(c) == EOF) goto err;
projects / thirdparty / util-linux.git / blobdiff