1 /*- 2 * Copyright (c) 2003 Networks Associates Technology, Inc. 3 * Copyright (c) 2004-2011 Dag-Erling Smørgrav 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 * $OpenPAM: openpam_readline.c 938 2017-04-30 21:34:42Z des $ 36 */ 37 38 #ifdef HAVE_CONFIG_H 39 # include "config.h" 40 #endif 41 42 #include <stdio.h> 43 #include <stdlib.h> 44 45 #include <security/pam_appl.h> 46 47 #include "openpam_impl.h" 48 49 #define MIN_LINE_LENGTH 128 50 51 /* 52 * OpenPAM extension 53 * 54 * Read a line from a file. 55 */ 56 57 char * 58 openpam_readline(FILE *f, int *lineno, size_t *lenp) 59 { 60 char *line; 61 size_t len, size; 62 int ch; 63 64 line = NULL; 65 if (openpam_straddch(&line, &size, &len, 0) != 0) 66 return (NULL); 67 for (;;) { 68 ch = fgetc(f); 69 /* strip comment */ 70 if (ch == '#') { 71 do { 72 ch = fgetc(f); 73 } while (ch != EOF && ch != '\n'); 74 } 75 /* eof */ 76 if (ch == EOF) { 77 /* done */ 78 break; 79 } 80 /* eol */ 81 if (ch == '\n') { 82 if (lineno != NULL) 83 ++*lineno; 84 /* skip blank lines */ 85 if (len == 0) 86 continue; 87 /* continuation */ 88 if (line[len - 1] == '\\') { 89 line[--len] = '\0'; 90 continue; 91 } 92 /* done */ 93 break; 94 } 95 /* anything else */ 96 if (openpam_straddch(&line, &size, &len, ch) != 0) 97 goto fail; 98 } 99 if (len == 0) 100 goto fail; 101 if (lenp != NULL) 102 *lenp = len; 103 return (line); 104 fail: 105 FREE(line); 106 return (NULL); 107 } 108 109 /** 110 * DEPRECATED openpam_readlinev 111 * 112 * The =openpam_readline function reads a line from a file, and returns it 113 * in a NUL-terminated buffer allocated with =!malloc. 114 * 115 * The =openpam_readline function performs a certain amount of processing 116 * on the data it reads: 117 * 118 * - Comments (introduced by a hash sign) are stripped. 119 * 120 * - Blank lines are ignored. 121 * 122 * - If a line ends in a backslash, the backslash is stripped and the 123 * next line is appended. 124 * 125 * If =lineno is not =NULL, the integer variable it points to is 126 * incremented every time a newline character is read. 127 * 128 * If =lenp is not =NULL, the length of the line (not including the 129 * terminating NUL character) is stored in the variable it points to. 130 * 131 * The caller is responsible for releasing the returned buffer by passing 132 * it to =!free. 133 * 134 * >openpam_readlinev 135 * >openpam_readword 136 */ 137