1 /* $NetBSD: ttyaction.c,v 1.13 1999/09/20 04:48:10 lukem Exp $ */ 2 3 /*- 4 * Copyright (c) 1996 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Gordon W. Ross. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 /* 40 * For each matching "tty" and "action" run the "command." 41 * See fnmatch() for matching the tty name. 42 */ 43 44 #include <sys/types.h> 45 #include <sys/wait.h> 46 47 #include <assert.h> 48 #include <err.h> 49 #include <errno.h> 50 #include <fcntl.h> 51 #include <fnmatch.h> 52 #include <paths.h> 53 #include <stdio.h> 54 #include <stdlib.h> 55 #include <string.h> 56 #include <unistd.h> 57 58 #include "util.h" 59 60 #ifndef _PATH_TTYACTION 61 #define _PATH_TTYACTION "/etc/ttyaction" 62 #endif 63 64 static char *actfile = _PATH_TTYACTION; 65 static char *pathenv = __CONCAT("PATH=",_PATH_STDPATH); 66 67 int 68 ttyaction(tty, act, user) 69 const char *tty; 70 const char *act; 71 const char *user; 72 { 73 FILE *fp; 74 char *p1, *p2; 75 char *argv[4]; 76 char *envp[8]; 77 char *lastp; 78 char line[1024]; 79 char env_tty[64]; 80 char env_act[64]; 81 char env_user[256]; 82 int error, linenum, pid, status; 83 84 _DIAGASSERT(tty != NULL); 85 _DIAGASSERT(act != NULL); 86 _DIAGASSERT(user != NULL); 87 88 fp = fopen(actfile, "r"); 89 if (fp == NULL) 90 return 0; 91 92 /* Skip the "/dev/" part of the first arg. */ 93 if (!strncmp(tty, "/dev/", 5)) 94 tty += 5; 95 96 /* Args will be: "sh -c ..." */ 97 argv[0] = _PATH_BSHELL; 98 argv[1] = "-c"; 99 argv[2] = NULL; /* see below */ 100 argv[3] = NULL; 101 102 /* 103 * Environment needs: TTY, ACT, USER 104 */ 105 snprintf(env_tty, sizeof(env_tty), "TTY=%s", tty); 106 snprintf(env_act, sizeof(env_act), "ACT=%s", act); 107 snprintf(env_user, sizeof(env_user), "USER=%s", user); 108 envp[0] = pathenv; 109 envp[1] = env_tty; 110 envp[2] = env_act; 111 envp[3] = env_user; 112 envp[4] = NULL; 113 114 linenum = 0; 115 status = 0; 116 while (fgets(line, sizeof(line), fp)) { 117 linenum++; 118 119 /* Allow comment lines. */ 120 if (line[0] == '#') 121 continue; 122 123 p1 = strtok_r(line, " \t", &lastp); 124 p2 = strtok_r(NULL, " \t", &lastp); 125 /* This arg goes to end of line. */ 126 argv[2] = strtok_r(NULL, "\n", &lastp); 127 if (!p1 || !p2 || !argv[2]) { 128 warnx("%s: line %d format error", actfile, linenum); 129 continue; 130 } 131 if (fnmatch(p1, tty, 0) || fnmatch(p2, act, 0)) 132 continue; 133 /* OK, this is a match. Run the command. */ 134 pid = fork(); 135 if (pid == -1) { 136 warnx("fork failed: %s", strerror(errno)); 137 continue; 138 } 139 if (pid == 0) { 140 /* This is the child. */ 141 error = execve(argv[0], argv, envp); 142 /* If we get here, it is an error. */ 143 warnx("%s: line %d: exec failed: %s", 144 actfile, linenum, strerror(errno)); 145 _exit(1); 146 } 147 /* This is the parent. */ 148 error = waitpid(pid, &status, 0); 149 if (error == -1) { 150 warnx("%s: line %d: wait failed: %s", 151 actfile, linenum, strerror(errno)); 152 continue; 153 } 154 if (WTERMSIG(status)) { 155 warnx("%s: line %d: child died with signal %d", 156 actfile, linenum, WTERMSIG(status)); 157 continue; 158 } 159 } 160 fclose(fp); 161 return status; 162 } 163