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 *
openpam_readline(FILE * f,int * lineno,size_t * lenp)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