1 /* 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2009 Ed Schouten <ed@FreeBSD.org> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/types.h> 30 31 #include <pwd.h> 32 #include <stdlib.h> 33 #include <string.h> 34 #include <unistd.h> 35 #include <utmpx.h> 36 37 static int last_fd = -1; 38 39 static void 40 utempter_update_utmpx(int type, int fd, const char *host) 41 { 42 struct utmpx ut; 43 struct passwd *pw; 44 uid_t uid; 45 46 (void) memset(&ut, 0, sizeof (ut)); 47 ut.ut_type = type; 48 ut.ut_pid = getpid(); 49 ut.ut_session = getsid(0); 50 (void) gettimeofday(&ut.ut_tv, NULL); 51 if (snprintf(ut.ut_id, sizeof (ut.ut_id), "f%d", fd) >= 52 sizeof (ut.ut_id)) 53 return; 54 uid = getuid(); 55 if ((pw = getpwuid(uid)) == NULL) 56 return; 57 (void) strlcpy(ut.ut_user, pw->pw_name, sizeof (ut.ut_user)); 58 59 if (type == DEAD_PROCESS) { 60 struct utmpx *ut1; 61 struct utmpx ut2; 62 63 (void) memset(&ut2, 0, sizeof (ut2)); 64 ut2.ut_type = USER_PROCESS; 65 if (snprintf(ut2.ut_id, sizeof (ut2.ut_id), "f%d", fd) >= 66 sizeof (ut2.ut_id)) 67 return; 68 if ((ut1 = getutxid(&ut2)) == NULL) 69 return; 70 (void) strlcpy(ut.ut_line, ut1->ut_line, sizeof (ut.ut_line)); 71 } else { 72 char *line = ptsname(fd); 73 if (line == NULL) 74 return; 75 (void) strlcpy(ut.ut_line, line + strlen("/dev/"), 76 sizeof (ut.ut_line)); 77 } 78 79 if (host != NULL) { 80 (void) strlcpy(ut.ut_host, host, sizeof (ut.ut_host)); 81 ut.ut_syslen = strlen(ut.ut_host) + 1; 82 } 83 84 setutxent(); 85 (void) pututxline(&ut); 86 endutxent(); 87 } 88 89 int 90 utempter_add_record(int fd, const char *host) 91 { 92 utempter_update_utmpx(USER_PROCESS, fd, host); 93 last_fd = fd; 94 return (0); 95 } 96 97 int 98 utempter_remove_record(int fd) 99 { 100 utempter_update_utmpx(DEAD_PROCESS, fd, NULL); 101 if (last_fd == fd) 102 last_fd = -1; 103 return (0); 104 } 105 106 int 107 utempter_remove_added_record(void) 108 { 109 if (last_fd < 0) 110 return (0); 111 utempter_update_utmpx(DEAD_PROCESS, last_fd, NULL); 112 last_fd = -1; 113 return (0); 114 } 115 116 void 117 addToUtmp(const char *pty __unused, const char *host, int fd) 118 { 119 (void) utempter_add_record(fd, host); 120 } 121 122 void 123 removeFromUtmp(void) 124 { 125 (void) utempter_remove_added_record(); 126 } 127 128 void 129 removeLineFromUtmp(const char *pty __unused, int fd) 130 { 131 (void) utempter_remove_record(fd); 132 } 133