openpam_readline.c revision 236099
1/*- 2 * Copyright (c) 2003 Networks Associates Technology, Inc. 3 * Copyright (c) 2004-2011 Dag-Erling Sm��rgrav 4 * All rights reserved. 5 * 6 * This software was developed for the FreeBSD Project by ThinkSec AS and 7 * Network Associates Laboratories, the Security Research Division of 8 * Network Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 9 * ("CBOSS"), as part of the DARPA CHATS research program. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. The name of the author may not be used to endorse or promote 20 * products derived from this software without specific prior written 21 * permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * $Id: openpam_readline.c 596 2012-04-14 14:52:40Z des $ 36 */ 37 38#ifdef HAVE_CONFIG_H 39# include "config.h" 40#endif 41 42#include <ctype.h> 43#include <stdio.h> 44#include <stdlib.h> 45 46#include <security/pam_appl.h> 47 48#include "openpam_impl.h" 49 50#define MIN_LINE_LENGTH 128 51 52/* 53 * OpenPAM extension 54 * 55 * Read a line from a file. 56 */ 57 58char * 59openpam_readline(FILE *f, int *lineno, size_t *lenp) 60{ 61 char *line; 62 size_t len, size; 63 int ch; 64 65 if ((line = malloc(size = MIN_LINE_LENGTH)) == NULL) { 66 openpam_log(PAM_LOG_ERROR, "malloc(): %m"); 67 return (NULL); 68 } 69 len = 0; 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 openpam_log(PAM_LOG_LIBDEBUG, "returning '%s'", line); 107 return (line); 108fail: 109 FREE(line); 110 return (NULL); 111} 112 113/** 114 * DEPRECATED openpam_readlinev 115 * 116 * The =openpam_readline function reads a line from a file, and returns it 117 * in a NUL-terminated buffer allocated with =!malloc. 118 * 119 * The =openpam_readline function performs a certain amount of processing 120 * on the data it reads: 121 * 122 * - Comments (introduced by a hash sign) are stripped. 123 * 124 * - Blank lines are ignored. 125 * 126 * - If a line ends in a backslash, the backslash is stripped and the 127 * next line is appended. 128 * 129 * If =lineno is not =NULL, the integer variable it points to is 130 * incremented every time a newline character is read. 131 * 132 * If =lenp is not =NULL, the length of the line (not including the 133 * terminating NUL character) is stored in the variable it points to. 134 * 135 * The caller is responsible for releasing the returned buffer by passing 136 * it to =!free. 137 * 138 * >openpam_readlinev 139 * >openpam_readword 140 */ 141