2 * Copyright 2018 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the OpenSSL license (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
13 #include <openssl/bio.h>
16 static int prefix_write(BIO *b, const char *out, size_t outl,
18 static int prefix_read(BIO *b, char *buf, size_t size, size_t *numread);
19 static int prefix_puts(BIO *b, const char *str);
20 static int prefix_gets(BIO *b, char *str, int size);
21 static long prefix_ctrl(BIO *b, int cmd, long arg1, void *arg2);
22 static int prefix_create(BIO *b);
23 static int prefix_destroy(BIO *b);
24 static long prefix_callback_ctrl(BIO *b, int cmd, BIO_info_cb *fp);
26 static BIO_METHOD *prefix_meth = NULL;
28 BIO_METHOD *apps_bf_prefix(void)
30 if (prefix_meth == NULL) {
32 BIO_meth_new(BIO_TYPE_FILTER, "Prefix filter")) == NULL
33 || !BIO_meth_set_create(prefix_meth, prefix_create)
34 || !BIO_meth_set_destroy(prefix_meth, prefix_destroy)
35 || !BIO_meth_set_write_ex(prefix_meth, prefix_write)
36 || !BIO_meth_set_read_ex(prefix_meth, prefix_read)
37 || !BIO_meth_set_puts(prefix_meth, prefix_puts)
38 || !BIO_meth_set_gets(prefix_meth, prefix_gets)
39 || !BIO_meth_set_ctrl(prefix_meth, prefix_ctrl)
40 || !BIO_meth_set_callback_ctrl(prefix_meth, prefix_callback_ctrl)) {
41 BIO_meth_free(prefix_meth);
48 typedef struct prefix_ctx_st {
50 int linestart; /* flag to indicate we're at the line start */
53 static int prefix_create(BIO *b)
55 PREFIX_CTX *ctx = OPENSSL_zalloc(sizeof(*ctx));
67 static int prefix_destroy(BIO *b)
69 PREFIX_CTX *ctx = BIO_get_data(b);
71 OPENSSL_free(ctx->prefix);
76 static int prefix_read(BIO *b, char *in, size_t size, size_t *numread)
78 return BIO_read_ex(BIO_next(b), in, size, numread);
81 static int prefix_write(BIO *b, const char *out, size_t outl,
84 PREFIX_CTX *ctx = BIO_get_data(b);
89 /* If no prefix is set or if it's empty, we've got nothing to do here */
90 if (ctx->prefix == NULL || *ctx->prefix == '\0') {
91 /* We do note if what comes next will be a new line, though */
93 ctx->linestart = (out[outl-1] == '\n');
94 return BIO_write_ex(BIO_next(b), out, outl, numwritten);
103 /* If we know that we're at the start of the line, output the prefix */
104 if (ctx->linestart) {
107 if (!BIO_write_ex(BIO_next(b), ctx->prefix, strlen(ctx->prefix),
113 /* Now, go look for the next LF, or the end of the string */
114 for (i = 0, c = '\0'; i < outl && (c = out[i]) != '\n'; i++)
119 /* Output what we found so far */
123 if (!BIO_write_ex(BIO_next(b), out, i, &num))
131 /* If we found a LF, what follows is a new line, so take note */
139 static long prefix_ctrl(BIO *b, int cmd, long num, void *ptr)
144 case PREFIX_CTRL_SET_PREFIX:
146 PREFIX_CTX *ctx = BIO_get_data(b);
151 OPENSSL_free(ctx->prefix);
152 ctx->prefix = OPENSSL_strdup((const char *)ptr);
153 ret = ctx->prefix != NULL;
157 if (BIO_next(b) != NULL)
158 ret = BIO_ctrl(BIO_next(b), cmd, num, ptr);
164 static long prefix_callback_ctrl(BIO *b, int cmd, BIO_info_cb *fp)
166 return BIO_callback_ctrl(BIO_next(b), cmd, fp);
169 static int prefix_gets(BIO *b, char *buf, int size)
171 return BIO_gets(BIO_next(b), buf, size);
174 static int prefix_puts(BIO *b, const char *str)
176 return BIO_write(b, str, strlen(str));