1 /* $NetBSD: openpam_readlinev.c,v 1.4 2023/06/30 21:46:20 christos Exp $ */ 2 3 /*- 4 * Copyright (c) 2012-2016 Dag-Erling Smørgrav 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. The name of the author may not be used to endorse or promote 16 * products derived from this software without specific prior written 17 * permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #ifdef HAVE_CONFIG_H 33 # include "config.h" 34 #endif 35 36 #include <sys/cdefs.h> 37 __RCSID("$NetBSD: openpam_readlinev.c,v 1.4 2023/06/30 21:46:20 christos Exp $"); 38 39 #include <errno.h> 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_WORDV_SIZE 32 48 49 /* 50 * OpenPAM extension 51 * 52 * Read a line from a file and split it into words. 53 */ 54 55 char ** 56 openpam_readlinev(FILE *f, int *lineno, int *lenp) 57 { 58 char *word, **wordv, **tmp; 59 size_t wordlen, wordvsize; 60 int ch, serrno, wordvlen; 61 62 wordvsize = MIN_WORDV_SIZE; 63 wordvlen = 0; 64 if ((wordv = malloc(wordvsize * sizeof *wordv)) == NULL) { 65 errno = ENOMEM; 66 return (NULL); 67 } 68 wordv[wordvlen] = NULL; 69 while ((word = openpam_readword(f, lineno, &wordlen)) != NULL) { 70 if ((unsigned int)wordvlen + 1 >= wordvsize) { 71 /* need to expand the array */ 72 wordvsize *= 2; 73 tmp = realloc(wordv, wordvsize * sizeof *wordv); 74 if (tmp == NULL) { 75 errno = ENOMEM; 76 break; 77 } 78 wordv = tmp; 79 } 80 /* insert our word */ 81 wordv[wordvlen++] = word; 82 wordv[wordvlen] = NULL; 83 word = NULL; 84 } 85 if (errno != 0) { 86 /* I/O error or out of memory */ 87 serrno = errno; 88 while (wordvlen--) 89 free(wordv[wordvlen]); 90 free(wordv); 91 free(word); 92 errno = serrno; 93 return (NULL); 94 } 95 /* assert(!ferror(f)) */ 96 ch = fgetc(f); 97 /* assert(ch == EOF || ch == '\n') */ 98 if (ch == EOF && wordvlen == 0) { 99 free(wordv); 100 return (NULL); 101 } 102 if (ch == '\n' && lineno != NULL) 103 ++*lineno; 104 if (lenp != NULL) 105 *lenp = wordvlen; 106 return (wordv); 107 } 108 109 /** 110 * The =openpam_readlinev function reads a line from a file, splits it 111 * into words according to the rules described in the =openpam_readword 112 * manual page, and returns a list of those words. 113 * 114 * If =lineno is not =NULL, the integer variable it points to is 115 * incremented every time a newline character is read. 116 * This includes quoted or escaped newline characters and the newline 117 * character at the end of the line. 118 * 119 * If =lenp is not =NULL, the number of words on the line is stored in the 120 * variable to which it points. 121 * 122 * RETURN VALUES 123 * 124 * If successful, the =openpam_readlinev function returns a pointer to a 125 * dynamically allocated array of pointers to individual dynamically 126 * allocated NUL-terminated strings, each containing a single word, in the 127 * order in which they were encountered on the line. 128 * The array is terminated by a =NULL pointer. 129 * 130 * The caller is responsible for freeing both the array and the individual 131 * strings by passing each of them to =!free. 132 * 133 * If the end of the line was reached before any words were read, 134 * =openpam_readlinev returns a pointer to a dynamically allocated array 135 * containing a single =NULL pointer. 136 * 137 * The =openpam_readlinev function can fail and return =NULL for one of 138 * four reasons: 139 * 140 * - The end of the file was reached before any words were read; :errno is 141 * zero, =!ferror returns zero, and =!feof returns a non-zero value. 142 * 143 * - The end of the file was reached while a quote or backslash escape 144 * was in effect; :errno is set to =EINVAL, =!ferror returns zero, and 145 * =!feof returns a non-zero value. 146 * 147 * - An error occurred while reading from the file; :errno is non-zero, 148 * =!ferror returns a non-zero value and =!feof returns zero. 149 * 150 * - A =!malloc or =!realloc call failed; :errno is set to =ENOMEM, 151 * =!ferror returns a non-zero value, and =!feof may or may not return 152 * a non-zero value. 153 * 154 * >openpam_readline 155 * >openpam_readword 156 * 157 * AUTHOR DES 158 */ 159