1 /* $NetBSD: openpam_readline.c,v 1.3 2017/05/06 19:50:09 christos Exp $ */ 2 3 /*- 4 * Copyright (c) 2003 Networks Associates Technology, Inc. 5 * Copyright (c) 2004-2011 Dag-Erling Smørgrav 6 * All rights reserved. 7 * 8 * This software was developed for the FreeBSD Project by ThinkSec AS and 9 * Network Associates Laboratories, the Security Research Division of 10 * Network Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 11 * ("CBOSS"), as part of the DARPA CHATS research program. 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 3. The name of the author may not be used to endorse or promote 22 * products derived from this software without specific prior written 23 * permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35 * SUCH DAMAGE. 36 * 37 * $OpenPAM: openpam_readline.c 938 2017-04-30 21:34:42Z des $ 38 */ 39 40 #ifdef HAVE_CONFIG_H 41 # include "config.h" 42 #endif 43 44 #include <sys/cdefs.h> 45 __RCSID("$NetBSD: openpam_readline.c,v 1.3 2017/05/06 19:50:09 christos Exp $"); 46 47 #include <stdio.h> 48 #include <stdlib.h> 49 50 #include <security/pam_appl.h> 51 52 #include "openpam_impl.h" 53 54 #define MIN_LINE_LENGTH 128 55 56 /* 57 * OpenPAM extension 58 * 59 * Read a line from a file. 60 */ 61 62 char * 63 openpam_readline(FILE *f, int *lineno, size_t *lenp) 64 { 65 char *line; 66 size_t len, size; 67 int ch; 68 69 line = NULL; 70 if (openpam_straddch(&line, &size, &len, 0) != 0) 71 return (NULL); 72 for (;;) { 73 ch = fgetc(f); 74 /* strip comment */ 75 if (ch == '#') { 76 do { 77 ch = fgetc(f); 78 } while (ch != EOF && ch != '\n'); 79 } 80 /* eof */ 81 if (ch == EOF) { 82 /* done */ 83 break; 84 } 85 /* eol */ 86 if (ch == '\n') { 87 if (lineno != NULL) 88 ++*lineno; 89 /* skip blank lines */ 90 if (len == 0) 91 continue; 92 /* continuation */ 93 if (line[len - 1] == '\\') { 94 line[--len] = '\0'; 95 continue; 96 } 97 /* done */ 98 break; 99 } 100 /* anything else */ 101 if (openpam_straddch(&line, &size, &len, ch) != 0) 102 goto fail; 103 } 104 if (len == 0) 105 goto fail; 106 if (lenp != NULL) 107 *lenp = len; 108 return (line); 109 fail: 110 FREE(line); 111 return (NULL); 112 } 113 114 /** 115 * DEPRECATED openpam_readlinev 116 * 117 * The =openpam_readline function reads a line from a file, and returns it 118 * in a NUL-terminated buffer allocated with =!malloc. 119 * 120 * The =openpam_readline function performs a certain amount of processing 121 * on the data it reads: 122 * 123 * - Comments (introduced by a hash sign) are stripped. 124 * 125 * - Blank lines are ignored. 126 * 127 * - If a line ends in a backslash, the backslash is stripped and the 128 * next line is appended. 129 * 130 * If =lineno is not =NULL, the integer variable it points to is 131 * incremented every time a newline character is read. 132 * 133 * If =lenp is not =NULL, the length of the line (not including the 134 * terminating NUL character) is stored in the variable it points to. 135 * 136 * The caller is responsible for releasing the returned buffer by passing 137 * it to =!free. 138 * 139 * >openpam_readlinev 140 * >openpam_readword 141 */ 142