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131 .IX Title "BIO_find_type 3"
132 .TH BIO_find_type 3 "2017-12-07" "1.0.2n" "OpenSSL"
133 .\" For nroff, turn off justification. Always turn off hyphenation; it makes
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138 BIO_find_type, BIO_next, BIO_method_type \- BIO chain traversal
140 .IX Header "SYNOPSIS"
142 \& #include <openssl/bio.h>
144 \& BIO * BIO_find_type(BIO *b,int bio_type);
145 \& BIO * BIO_next(BIO *b);
147 \& #define BIO_method_type(b) ((b)\->method\->type)
149 \& #define BIO_TYPE_NONE 0
150 \& #define BIO_TYPE_MEM (1|0x0400)
151 \& #define BIO_TYPE_FILE (2|0x0400)
153 \& #define BIO_TYPE_FD (4|0x0400|0x0100)
154 \& #define BIO_TYPE_SOCKET (5|0x0400|0x0100)
155 \& #define BIO_TYPE_NULL (6|0x0400)
156 \& #define BIO_TYPE_SSL (7|0x0200)
157 \& #define BIO_TYPE_MD (8|0x0200)
158 \& #define BIO_TYPE_BUFFER (9|0x0200)
159 \& #define BIO_TYPE_CIPHER (10|0x0200)
160 \& #define BIO_TYPE_BASE64 (11|0x0200)
161 \& #define BIO_TYPE_CONNECT (12|0x0400|0x0100)
162 \& #define BIO_TYPE_ACCEPT (13|0x0400|0x0100)
163 \& #define BIO_TYPE_PROXY_CLIENT (14|0x0200)
164 \& #define BIO_TYPE_PROXY_SERVER (15|0x0200)
165 \& #define BIO_TYPE_NBIO_TEST (16|0x0200)
166 \& #define BIO_TYPE_NULL_FILTER (17|0x0200)
167 \& #define BIO_TYPE_BER (18|0x0200)
168 \& #define BIO_TYPE_BIO (19|0x0400)
170 \& #define BIO_TYPE_DESCRIPTOR 0x0100
171 \& #define BIO_TYPE_FILTER 0x0200
172 \& #define BIO_TYPE_SOURCE_SINK 0x0400
175 .IX Header "DESCRIPTION"
176 The \fIBIO_find_type()\fR searches for a \s-1BIO\s0 of a given type in a chain, starting
177 at \s-1BIO \s0\fBb\fR. If \fBtype\fR is a specific type (such as \s-1BIO_TYPE_MEM\s0) then a search
178 is made for a \s-1BIO\s0 of that type. If \fBtype\fR is a general type (such as
179 \&\fB\s-1BIO_TYPE_SOURCE_SINK\s0\fR) then the next matching \s-1BIO\s0 of the given general type is
180 searched for. \fIBIO_find_type()\fR returns the next matching \s-1BIO\s0 or \s-1NULL\s0 if none is
183 Note: not all the \fBBIO_TYPE_*\fR types above have corresponding \s-1BIO\s0 implementations.
185 \&\fIBIO_next()\fR returns the next \s-1BIO\s0 in a chain. It can be used to traverse all BIOs
186 in a chain or used in conjunction with \fIBIO_find_type()\fR to find all BIOs of a
189 \&\fIBIO_method_type()\fR returns the type of a \s-1BIO.\s0
191 .IX Header "RETURN VALUES"
192 \&\fIBIO_find_type()\fR returns a matching \s-1BIO\s0 or \s-1NULL\s0 for no match.
194 \&\fIBIO_next()\fR returns the next \s-1BIO\s0 in a chain.
196 \&\fIBIO_method_type()\fR returns the type of the \s-1BIO \s0\fBb\fR.
199 \&\fIBIO_next()\fR was added to OpenSSL 0.9.6 to provide a 'clean' way to traverse a \s-1BIO\s0
200 chain or find multiple matches using \fIBIO_find_type()\fR. Previous versions had to
204 \& next = bio\->next_bio;
208 \&\fIBIO_find_type()\fR in OpenSSL 0.9.5a and earlier could not be safely passed a
209 \&\s-1NULL\s0 pointer for the \fBb\fR argument.
212 Traverse a chain looking for digest BIOs:
216 \& btmp = in_bio; /* in_bio is chain to search through */
219 \& btmp = BIO_find_type(btmp, BIO_TYPE_MD);
220 \& if(btmp == NULL) break; /* Not found */
221 \& /* btmp is a digest BIO, do something with it ...*/
224 \& btmp = BIO_next(btmp);
228 .IX Header "SEE ALSO"