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