Imported from util-linux-2.2 tarball.

1 files changed, 252 insertions, 0 deletions

diff --git a/login-utils/vipw.c b/login-utils/vipw.c
new file mode 100644
index 000000000..f36df5f2e
--- /dev/null
+++ b/login-utils/vipw.c
@@ -0,0 +1,252 @@
+/*
+ * Copyright (c) 1987 Regents of the University of California.
+ * All rights reserved.
+ *
+ * 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
+char copyright[] =
+"@(#) Copyright (c) 1987 Regents of the University of California.\n\
+ All rights reserved.\n";
+#endif /* not lint */
+
+#ifndef lint
+/*static char sccsid[] = "from: @(#)vipw.c	5.16 (Berkeley) 3/3/91";*/
+static char rcsid[] = "vipw.c,v 1.1.1.1 1995/02/22 19:09:25 faith Exp";
+#endif /* not lint */
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <pwd.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/param.h>
+#include <sys/time.h>
+#include <sys/wait.h>
+#include <sys/resource.h>
+#include <sys/file.h>
+#include <signal.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <paths.h>
+#include <unistd.h>
+
+#include "pathnames.h"
+
+
+char *progname = "vipw";
+void pw_error __P((char *, int, int));
+
+
+copyfile(from, to)
+	register int from, to;
+{
+	register int nr, nw, off;
+	char buf[8*1024];
+	
+	while ((nr = read(from, buf, sizeof(buf))) > 0)
+		for (off = 0; off < nr; nr -= nw, off += nw)
+			if ((nw = write(to, buf + off, nr)) < 0)
+				pw_error(_PATH_PTMP, 1, 1);
+	if (nr < 0)
+		pw_error(_PATH_PASSWD, 1, 1);
+}
+
+
+void
+pw_init()
+{
+	struct rlimit rlim;
+
+	/* Unlimited resource limits. */
+	rlim.rlim_cur = rlim.rlim_max = RLIM_INFINITY;
+	(void)setrlimit(RLIMIT_CPU, &rlim);
+	(void)setrlimit(RLIMIT_FSIZE, &rlim);
+	(void)setrlimit(RLIMIT_STACK, &rlim);
+	(void)setrlimit(RLIMIT_DATA, &rlim);
+	(void)setrlimit(RLIMIT_RSS, &rlim);
+
+	/* Don't drop core (not really necessary, but GP's). */
+	rlim.rlim_cur = rlim.rlim_max = 0;
+	(void)setrlimit(RLIMIT_CORE, &rlim);
+
+	/* Turn off signals. */
+	(void)signal(SIGALRM, SIG_IGN);
+	(void)signal(SIGHUP, SIG_IGN);
+	(void)signal(SIGINT, SIG_IGN);
+	(void)signal(SIGPIPE, SIG_IGN);
+	(void)signal(SIGQUIT, SIG_IGN);
+	(void)signal(SIGTERM, SIG_IGN);
+	(void)signal(SIGTSTP, SIG_IGN);
+	(void)signal(SIGTTOU, SIG_IGN);
+
+	/* Create with exact permissions. */
+	(void)umask(0);
+}
+
+int
+pw_lock()
+{
+	static char path[MAXPATHLEN] = _PATH_PTMP;
+	int lockfd, fd, ret;
+	char *p;
+
+	/* 
+	 * If the password file doesn't exist, the system is hosed.
+	 * Might as well try to build one.  Set the close-on-exec bit so
+	 * that users can't get at the encrypted passwords while editing.
+	 * Open should allow flock'ing the file; see 4.4BSD.	XXX
+	 */
+	lockfd = open(_PATH_PASSWD, O_RDONLY, 0);
+	if (lockfd < 0) {
+		(void)fprintf(stderr, "%s: %s: %s\n",
+		    progname, _PATH_PASSWD, strerror(errno));
+		exit(1);
+	}
+	if (flock(lockfd, LOCK_EX|LOCK_NB)) {
+		(void)fprintf(stderr,
+		    "%s: the password file is busy.\n", progname);
+		exit(1);
+	}
+
+	if ((fd = open(_PATH_PTMPTMP, O_WRONLY|O_CREAT, 0644)) == -1) {
+		(void)fprintf(stderr,
+		    "%s: %s: %s\n", progname, _PATH_PTMPTMP, strerror(errno));
+		exit(1);
+	}
+	ret = link(_PATH_PTMPTMP, _PATH_PTMP);
+	(void)unlink(_PATH_PTMPTMP);
+	if (ret == -1) {
+	    if (errno == EEXIST)
+		(void)fprintf(stderr, 
+		    "%s: the password file is busy\n", progname);
+	    else
+		(void)fprintf(stderr, "%s: can't link %s: %s\n", progname,
+		    _PATH_PTMP, strerror(errno));
+	    exit(1);
+	}
+	copyfile(lockfd, fd);
+	(void)close(lockfd);
+	(void)close(fd);
+	return(1);
+}
+
+void
+pw_unlock()
+{
+	(void)unlink(_PATH_PASSWD);
+	if (link(_PATH_PTMP, _PATH_PASSWD) == -1) {
+	    (void)fprintf(stderr, 
+	    "%s: can't unlock %s: %s (your changes are still in %s)\n", 
+	    progname, _PATH_PASSWD, strerror(errno), _PATH_PTMP);
+	    exit(1);
+	}
+	(void)unlink(_PATH_PTMP);
+}
+
+
+void
+pw_edit(notsetuid)
+	int notsetuid;
+{
+	int pstat;
+	pid_t pid;
+	char *p, *editor;
+
+	if (!(editor = getenv("EDITOR")))
+		editor = _PATH_VI;
+	if ((p = strrchr(editor, '/')) != NULL)
+		++p;
+	else 
+		p = editor;
+
+	if (!(pid = vfork())) {
+		if (notsetuid) {
+			(void)setgid(getgid());
+			(void)setuid(getuid());
+		}
+		execlp(editor, p, _PATH_PTMP, NULL);
+		_exit(1);
+	}
+	for (;;) {
+	    pid = waitpid(pid, &pstat, WUNTRACED);
+	    if (WIFSTOPPED(pstat)) {
+		/* the editor suspended, so suspend us as well */
+		kill(getpid(), SIGSTOP);
+		kill(pid, SIGCONT);
+	    } else {
+		break;
+	    }
+	}
+	if (pid == -1 || !WIFEXITED(pstat) || WEXITSTATUS(pstat) != 0)
+		pw_error(editor, 1, 1);
+}
+
+void
+pw_error(name, err, eval)
+	char *name;
+	int err, eval;
+{
+	int sverrno;
+
+	if (err) {
+		sverrno = errno;
+		(void)fprintf(stderr, "%s: ", progname);
+		if (name)
+			(void)fprintf(stderr, "%s: ", name);
+		(void)fprintf(stderr, "%s\n", strerror(sverrno));
+	}
+	(void)fprintf(stderr,
+	    "%s: %s unchanged\n", progname, _PATH_PASSWD);
+	(void)unlink(_PATH_PTMP);
+	exit(eval);
+}
+
+main()
+{
+	register int pfd, tfd;
+	struct stat begin, end;
+
+	pw_init();
+	pw_lock();
+
+	if (stat(_PATH_PTMP, &begin))
+		pw_error(_PATH_PTMP, 1, 1);
+	pw_edit(0);
+	if (stat(_PATH_PTMP, &end))
+		pw_error(_PATH_PTMP, 1, 1);
+	if (begin.st_mtime == end.st_mtime) {
+		(void)fprintf(stderr, "vipw: no changes made\n");
+		pw_error((char *)NULL, 0, 0);
+	}
+	pw_unlock();
+	exit(0);
+}