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 * $OpenPAM: openpam_readlinev.c 938 2017-04-30 21:34:42Z des $ 30 */ 31 32 #ifdef HAVE_CONFIG_H 33 # include "config.h" 34 #endif 35 36 #include <errno.h> 37 #include <stdio.h> 38 #include <stdlib.h> 39 40 #include <security/pam_appl.h> 41 42 #include "openpam_impl.h" 43 44 #define MIN_WORDV_SIZE 32 45 46 /* 47 * OpenPAM extension 48 * 49 * Read a line from a file and split it into words. 50 */ 51 52 char ** 53 openpam_readlinev(FILE *f, int *lineno, int *lenp) 54 { 55 char *word, **wordv, **tmp; 56 size_t wordlen, wordvsize; 57 int ch, serrno, wordvlen; 58 59 wordvsize = MIN_WORDV_SIZE; 60 wordvlen = 0; 61 if ((wordv = malloc(wordvsize * sizeof *wordv)) == NULL) { 62 openpam_log(PAM_LOG_ERROR, "malloc(): %m"); 63 errno = ENOMEM; 64 return (NULL); 65 } 66 wordv[wordvlen] = NULL; 67 while ((word = openpam_readword(f, lineno, &wordlen)) != NULL) { 68 if ((unsigned int)wordvlen + 1 >= wordvsize) { 69 /* need to expand the array */ 70 wordvsize *= 2; 71 tmp = realloc(wordv, wordvsize * sizeof *wordv); 72 if (tmp == NULL) { 73 openpam_log(PAM_LOG_ERROR, "malloc(): %m"); 74 errno = ENOMEM; 75 break; 76 } 77 wordv = tmp; 78 } 79 /* insert our word */ 80 wordv[wordvlen++] = word; 81 wordv[wordvlen] = NULL; 82 word = NULL; 83 } 84 if (errno != 0) { 85 /* I/O error or out of memory */ 86 serrno = errno; 87 while (wordvlen--) 88 free(wordv[wordvlen]); 89 free(wordv); 90 free(word); 91 errno = serrno; 92 return (NULL); 93 } 94 /* assert(!ferror(f)) */ 95 ch = fgetc(f); 96 /* assert(ch == EOF || ch == '\n') */ 97 if (ch == EOF && wordvlen == 0) { 98 free(wordv); 99 return (NULL); 100 } 101 if (ch == '\n' && lineno != NULL) 102 ++*lineno; 103 if (lenp != NULL) 104 *lenp = wordvlen; 105 return (wordv); 106 } 107 108 /** 109 * The =openpam_readlinev function reads a line from a file, splits it 110 * into words according to the rules described in the =openpam_readword 111 * manual page, and returns a list of those words. 112 * 113 * If =lineno is not =NULL, the integer variable it points to is 114 * incremented every time a newline character is read. 115 * This includes quoted or escaped newline characters and the newline 116 * character at the end of the line. 117 * 118 * If =lenp is not =NULL, the number of words on the line is stored in the 119 * variable to which it points. 120 * 121 * RETURN VALUES 122 * 123 * If successful, the =openpam_readlinev function returns a pointer to a 124 * dynamically allocated array of pointers to individual dynamically 125 * allocated NUL-terminated strings, each containing a single word, in the 126 * order in which they were encountered on the line. 127 * The array is terminated by a =NULL pointer. 128 * 129 * The caller is responsible for freeing both the array and the individual 130 * strings by passing each of them to =!free. 131 * 132 * If the end of the line was reached before any words were read, 133 * =openpam_readlinev returns a pointer to a dynamically allocated array 134 * containing a single =NULL pointer. 135 * 136 * The =openpam_readlinev function can fail and return =NULL for one of 137 * four reasons: 138 * 139 * - The end of the file was reached before any words were read; :errno is 140 * zero, =!ferror returns zero, and =!feof returns a non-zero value. 141 * 142 * - The end of the file was reached while a quote or backslash escape 143 * was in effect; :errno is set to =EINVAL, =!ferror returns zero, and 144 * =!feof returns a non-zero value. 145 * 146 * - An error occurred while reading from the file; :errno is non-zero, 147 * =!ferror returns a non-zero value and =!feof returns zero. 148 * 149 * - A =!malloc or =!realloc call failed; :errno is set to =ENOMEM, 150 * =!ferror returns a non-zero value, and =!feof may or may not return 151 * a non-zero value. 152 * 153 * >openpam_readline 154 * >openpam_readword 155 * 156 * AUTHOR DES 157 */ 158