1 /*- 2 * Copyright (c) 2012-2016 Dag-Erling Smørgrav 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. The name of the author may not be used to endorse or promote 14 * products derived from this software without specific prior written 15 * permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #ifdef HAVE_CONFIG_H 31 # include "config.h" 32 #endif 33 34 #include <errno.h> 35 #include <stdio.h> 36 #include <stdlib.h> 37 38 #include <security/pam_appl.h> 39 40 #include "openpam_impl.h" 41 42 #define MIN_WORDV_SIZE 32 43 44 /* 45 * OpenPAM extension 46 * 47 * Read a line from a file and split it into words. 48 */ 49 50 char ** 51 openpam_readlinev(FILE *f, int *lineno, int *lenp) 52 { 53 char *word, **wordv, **tmp; 54 size_t wordlen, wordvsize; 55 int ch, serrno, wordvlen; 56 57 wordvsize = MIN_WORDV_SIZE; 58 wordvlen = 0; 59 if ((wordv = malloc(wordvsize * sizeof *wordv)) == NULL) { 60 errno = ENOMEM; 61 return (NULL); 62 } 63 wordv[wordvlen] = NULL; 64 while ((word = openpam_readword(f, lineno, &wordlen)) != NULL) { 65 if ((unsigned int)wordvlen + 1 >= wordvsize) { 66 /* need to expand the array */ 67 wordvsize *= 2; 68 tmp = realloc(wordv, wordvsize * sizeof *wordv); 69 if (tmp == NULL) { 70 errno = ENOMEM; 71 break; 72 } 73 wordv = tmp; 74 } 75 /* insert our word */ 76 wordv[wordvlen++] = word; 77 wordv[wordvlen] = NULL; 78 word = NULL; 79 } 80 if (errno != 0) { 81 /* I/O error or out of memory */ 82 serrno = errno; 83 while (wordvlen--) 84 free(wordv[wordvlen]); 85 free(wordv); 86 free(word); 87 errno = serrno; 88 return (NULL); 89 } 90 /* assert(!ferror(f)) */ 91 ch = fgetc(f); 92 /* assert(ch == EOF || ch == '\n') */ 93 if (ch == EOF && wordvlen == 0) { 94 free(wordv); 95 return (NULL); 96 } 97 if (ch == '\n' && lineno != NULL) 98 ++*lineno; 99 if (lenp != NULL) 100 *lenp = wordvlen; 101 return (wordv); 102 } 103 104 /** 105 * The =openpam_readlinev function reads a line from a file, splits it 106 * into words according to the rules described in the =openpam_readword 107 * manual page, and returns a list of those words. 108 * 109 * If =lineno is not =NULL, the integer variable it points to is 110 * incremented every time a newline character is read. 111 * This includes quoted or escaped newline characters and the newline 112 * character at the end of the line. 113 * 114 * If =lenp is not =NULL, the number of words on the line is stored in the 115 * variable to which it points. 116 * 117 * RETURN VALUES 118 * 119 * If successful, the =openpam_readlinev function returns a pointer to a 120 * dynamically allocated array of pointers to individual dynamically 121 * allocated NUL-terminated strings, each containing a single word, in the 122 * order in which they were encountered on the line. 123 * The array is terminated by a =NULL pointer. 124 * 125 * The caller is responsible for freeing both the array and the individual 126 * strings by passing each of them to =!free. 127 * 128 * If the end of the line was reached before any words were read, 129 * =openpam_readlinev returns a pointer to a dynamically allocated array 130 * containing a single =NULL pointer. 131 * 132 * The =openpam_readlinev function can fail and return =NULL for one of 133 * four reasons: 134 * 135 * - The end of the file was reached before any words were read; :errno is 136 * zero, =!ferror returns zero, and =!feof returns a non-zero value. 137 * 138 * - The end of the file was reached while a quote or backslash escape 139 * was in effect; :errno is set to =EINVAL, =!ferror returns zero, and 140 * =!feof returns a non-zero value. 141 * 142 * - An error occurred while reading from the file; :errno is non-zero, 143 * =!ferror returns a non-zero value and =!feof returns zero. 144 * 145 * - A =!malloc or =!realloc call failed; :errno is set to =ENOMEM, 146 * =!ferror returns a non-zero value, and =!feof may or may not return 147 * a non-zero value. 148 * 149 * >openpam_readline 150 * >openpam_readword 151 * 152 * AUTHOR DES 153 */ 154