1/*-
2 * Copyright (c) 2003 Networks Associates Technology, Inc.
3 * Copyright (c) 2004-2011 Dag-Erling Sm��rgrav
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
55char *
56openpam_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);
102fail:
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