--- /dev/null
+.\" $NetBSD: utmp_update.8,v 1.1 2002/12/16 22:45:15 wiz Exp $
+.\"
+.\" Copyright (c) 2002 The NetBSD Foundation, Inc.
+.\" All rights reserved.
+.\"
+.\" This code is derived from software contributed to The NetBSD Foundation
+.\" by Thomas Klausner.
+.\"
+.\" 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.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
+.\"
+.Dd December 12, 2002
+.Dt UTMP_UPDATE 8
+.Os
+.Sh NAME
+.Nm utmp_update
+.Nd update utmpx database
+.Sh SYNOPSIS
+.Nm
+.Ar utmpx_entry
+.Sh DESCRIPTION
+.Nm
+is a helper program to allow a user to update his own
+.Xr utmpx 5
+entry.
+.Nm
+does some consistency checks on the
+.Xr strvis 3 Ns No -encoded
+.Ar utmpx_entry
+and then updates the
+.Xr utmpx 5
+database of currently logged in users.
+.Pp
+.Nm
+should not be called directly, but will normally only be called by
+.Xr pututxline 3
+if the privileges of the calling user are not sufficient.
+.Sh EXIT STATUS
+.Nm
+returns 0 on success, and 1 if an error occurred.
+.Sh SEE ALSO
+.Xr pututxline 3 ,
+.Xr utmpx 5
--- /dev/null
+/* $NetBSD: utmp_update.c,v 1.8 2008/04/28 20:23:04 martin Exp $ */
+
+/*-
+ * Copyright (c) 2002 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Christos Zoulas.
+ *
+ * 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
+ */
+#include <sys/cdefs.h>
+
+#include <sys/types.h>
+#include <sys/param.h>
+#include <sys/stat.h>
+
+#include <stdio.h>
+#include <vis.h>
+#include <err.h>
+#include <fcntl.h>
+#include <pwd.h>
+#include <utmpx.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <paths.h>
+
+int main(int, char *[]);
+
+int
+main(int argc, char *argv[])
+{
+ struct utmpx *utx;
+ size_t len;
+ struct passwd *pwd;
+ struct stat st;
+ int fd;
+ int res;
+ uid_t euid, ruid;
+ char tty[MAXPATHLEN];
+
+ euid = geteuid();
+ ruid = getuid();
+ if (seteuid(ruid) == -1)
+ err(1, "seteuid");
+
+ if (argc != 2) {
+ (void)fprintf(stderr, "Usage: %s <vis-utmpx-entry>\n",
+ getprogname());
+ exit(1);
+ }
+
+ len = strlen(argv[1]);
+
+ if (len > sizeof(*utx) * 4 + 1 || len < sizeof(*utx))
+ errx(1, "Bad argument");
+
+ if ((utx = malloc(len)) == NULL)
+ err(1, NULL);
+
+ res = strunvis((char *)utx, argv[1]);
+ if (res != (int)sizeof(*utx))
+ errx(1, "Decoding error %s %d != %zu", argv[1], res, sizeof(*utx));
+
+ switch (utx->ut_type) {
+ case USER_PROCESS:
+ case DEAD_PROCESS:
+ break;
+ default:
+ errx(1, "Invalid utmpx type %d", (int)utx->ut_type);
+ }
+
+ if (ruid != 0) {
+ if ((pwd = getpwuid(ruid)) == NULL)
+ errx(1, "User %lu does not exist in password database",
+ (long)ruid);
+
+ if (strcmp(pwd->pw_name, utx->ut_name) != 0)
+ errx(1, "Current user `%s' does not match "
+ "`%s' in utmpx entry", pwd->pw_name, utx->ut_name);
+ }
+
+ (void)snprintf(tty, sizeof(tty), "%s%s", _PATH_DEV, utx->ut_line);
+ fd = open(tty, O_RDONLY|O_NONBLOCK, 0);
+ if (fd != -1) {
+ if (fstat(fd, &st) == -1)
+ err(1, "Cannot stat `%s'", tty);
+ if (ruid != 0 && st.st_uid != ruid)
+ errx(1, "%s: Is not owned by you", tty);
+ if (!isatty(fd))
+ errx(1, "%s: Not a tty device", tty);
+ (void)close(fd);
+ if (access(tty, W_OK|R_OK) == -1)
+ err(1, "%s", tty);
+ } else {
+ struct utmpx utold, *utoldp;
+ /*
+ * A daemon like ftpd that does not use a tty line?
+ * We only allow it to kill its own existing entries
+ */
+ if (utx->ut_type != DEAD_PROCESS)
+ err(1, "Cannot open `%s'", tty);
+
+ (void)memcpy(utold.ut_line, utx->ut_line, sizeof(utx->ut_line));
+ if ((utoldp = getutxline(&utold)) == NULL)
+ err(1, "Cannot find existing entry for `%s'",
+ utx->ut_line);
+ if (utoldp->ut_pid != getppid())
+ err(1, "Cannot modify entry for `%s'", tty);
+ }
+
+ (void)seteuid(euid);
+ if (pututxline(utx) == NULL)
+ err(1, "Cannot update utmp entry");
+
+ return 0;
+}
alexh's projects / dragonfly.git / commitdiff