1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
|
/*
* Copyright 2018 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the OpenSSL license (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <openssl/bio.h>
#include "apps.h"
static int prefix_write(BIO *b, const char *out, size_t outl,
size_t *numwritten);
static int prefix_read(BIO *b, char *buf, size_t size, size_t *numread);
static int prefix_puts(BIO *b, const char *str);
static int prefix_gets(BIO *b, char *str, int size);
static long prefix_ctrl(BIO *b, int cmd, long arg1, void *arg2);
static int prefix_create(BIO *b);
static int prefix_destroy(BIO *b);
static long prefix_callback_ctrl(BIO *b, int cmd, BIO_info_cb *fp);
static BIO_METHOD *prefix_meth = NULL;
BIO_METHOD *apps_bf_prefix(void)
{
if (prefix_meth == NULL) {
if ((prefix_meth =
BIO_meth_new(BIO_TYPE_FILTER, "Prefix filter")) == NULL
|| !BIO_meth_set_create(prefix_meth, prefix_create)
|| !BIO_meth_set_destroy(prefix_meth, prefix_destroy)
|| !BIO_meth_set_write_ex(prefix_meth, prefix_write)
|| !BIO_meth_set_read_ex(prefix_meth, prefix_read)
|| !BIO_meth_set_puts(prefix_meth, prefix_puts)
|| !BIO_meth_set_gets(prefix_meth, prefix_gets)
|| !BIO_meth_set_ctrl(prefix_meth, prefix_ctrl)
|| !BIO_meth_set_callback_ctrl(prefix_meth, prefix_callback_ctrl)) {
BIO_meth_free(prefix_meth);
prefix_meth = NULL;
}
}
return prefix_meth;
}
typedef struct prefix_ctx_st {
char *prefix;
int linestart; /* flag to indicate we're at the line start */
} PREFIX_CTX;
static int prefix_create(BIO *b)
{
PREFIX_CTX *ctx = OPENSSL_zalloc(sizeof(*ctx));
if (ctx == NULL)
return 0;
ctx->prefix = NULL;
ctx->linestart = 1;
BIO_set_data(b, ctx);
BIO_set_init(b, 1);
return 1;
}
static int prefix_destroy(BIO *b)
{
PREFIX_CTX *ctx = BIO_get_data(b);
OPENSSL_free(ctx->prefix);
OPENSSL_free(ctx);
return 1;
}
static int prefix_read(BIO *b, char *in, size_t size, size_t *numread)
{
return BIO_read_ex(BIO_next(b), in, size, numread);
}
static int prefix_write(BIO *b, const char *out, size_t outl,
size_t *numwritten)
{
PREFIX_CTX *ctx = BIO_get_data(b);
if (ctx == NULL)
return 0;
/* If no prefix is set or if it's empty, we've got nothing to do here */
if (ctx->prefix == NULL || *ctx->prefix == '\0') {
/* We do note if what comes next will be a new line, though */
if (outl > 0)
ctx->linestart = (out[outl-1] == '\n');
return BIO_write_ex(BIO_next(b), out, outl, numwritten);
}
*numwritten = 0;
while (outl > 0) {
size_t i;
char c;
/* If we know that we're at the start of the line, output the prefix */
if (ctx->linestart) {
size_t dontcare;
if (!BIO_write_ex(BIO_next(b), ctx->prefix, strlen(ctx->prefix),
&dontcare))
return 0;
ctx->linestart = 0;
}
/* Now, go look for the next LF, or the end of the string */
for (i = 0, c = '\0'; i < outl && (c = out[i]) != '\n'; i++)
continue;
if (c == '\n')
i++;
/* Output what we found so far */
while (i > 0) {
size_t num = 0;
if (!BIO_write_ex(BIO_next(b), out, i, &num))
return 0;
out += num;
outl -= num;
*numwritten += num;
i -= num;
}
/* If we found a LF, what follows is a new line, so take note */
if (c == '\n')
ctx->linestart = 1;
}
return 1;
}
static long prefix_ctrl(BIO *b, int cmd, long num, void *ptr)
{
long ret = 0;
switch (cmd) {
case PREFIX_CTRL_SET_PREFIX:
{
PREFIX_CTX *ctx = BIO_get_data(b);
if (ctx == NULL)
break;
OPENSSL_free(ctx->prefix);
ctx->prefix = OPENSSL_strdup((const char *)ptr);
ret = ctx->prefix != NULL;
}
break;
default:
if (BIO_next(b) != NULL)
ret = BIO_ctrl(BIO_next(b), cmd, num, ptr);
break;
}
return ret;
}
static long prefix_callback_ctrl(BIO *b, int cmd, BIO_info_cb *fp)
{
return BIO_callback_ctrl(BIO_next(b), cmd, fp);
}
static int prefix_gets(BIO *b, char *buf, int size)
{
return BIO_gets(BIO_next(b), buf, size);
}
static int prefix_puts(BIO *b, const char *str)
{
return BIO_write(b, str, strlen(str));
}
|
