1 /* $NetBSD: openpam_readline.c,v 1.4 2023/06/30 21:46:20 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 38 #ifdef HAVE_CONFIG_H 39 # include "config.h" 40 #endif 41 42 #include <sys/cdefs.h> 43 __RCSID("$NetBSD: openpam_readline.c,v 1.4 2023/06/30 21:46:20 christos Exp $"); 44 45 #include <stdio.h> 46 #include <stdlib.h> 47 48 #include <security/pam_appl.h> 49 50 #include "openpam_impl.h" 51 52 #define MIN_LINE_LENGTH 128 53 54 /* 55 * OpenPAM extension 56 * 57 * Read a line from a file. 58 */ 59 60 char * 61 openpam_readline(FILE *f, int *lineno, size_t *lenp) 62 { 63 char *line; 64 size_t len, size; 65 int ch; 66 67 line = NULL; 68 if (openpam_straddch(&line, &size, &len, 0) != 0) 69 return (NULL); 70 for (;;) { 71 ch = fgetc(f); 72 /* strip comment */ 73 if (ch == '#') { 74 do { 75 ch = fgetc(f); 76 } while (ch != EOF && ch != '\n'); 77 } 78 /* eof */ 79 if (ch == EOF) { 80 /* done */ 81 break; 82 } 83 /* eol */ 84 if (ch == '\n') { 85 if (lineno != NULL) 86 ++*lineno; 87 /* skip blank lines */ 88 if (len == 0) 89 continue; 90 /* continuation */ 91 if (line[len - 1] == '\\') { 92 line[--len] = '\0'; 93 continue; 94 } 95 /* done */ 96 break; 97 } 98 /* anything else */ 99 if (openpam_straddch(&line, &size, &len, ch) != 0) 100 goto fail; 101 } 102 if (len == 0) 103 goto fail; 104 if (lenp != NULL) 105 *lenp = len; 106 return (line); 107 fail: 108 FREE(line); 109 return (NULL); 110 } 111 112 /** 113 * DEPRECATED openpam_readlinev 114 * 115 * The =openpam_readline function reads a line from a file, and returns it 116 * in a NUL-terminated buffer allocated with =!malloc. 117 * 118 * The =openpam_readline function performs a certain amount of processing 119 * on the data it reads: 120 * 121 * - Comments (introduced by a hash sign) are stripped. 122 * 123 * - Blank lines are ignored. 124 * 125 * - If a line ends in a backslash, the backslash is stripped and the 126 * next line is appended. 127 * 128 * If =lineno is not =NULL, the integer variable it points to is 129 * incremented every time a newline character is read. 130 * 131 * If =lenp is not =NULL, the length of the line (not including the 132 * terminating NUL character) is stored in the variable it points to. 133 * 134 * The caller is responsible for releasing the returned buffer by passing 135 * it to =!free. 136 * 137 * >openpam_readlinev 138 * >openpam_readword 139 */ 140