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140 .IX Title "BIO_find_type 3"
141 .TH BIO_find_type 3 "0.9.7a" "2003-02-19" "OpenSSL"
144 BIO_find_type, BIO_next \- \s-1BIO\s0 chain traversal
146 .IX Header "SYNOPSIS"
148 \& #include <openssl/bio.h>
151 \& BIO * BIO_find_type(BIO *b,int bio_type);
152 \& BIO * BIO_next(BIO *b);
155 \& #define BIO_method_type(b) ((b)->method->type)
158 \& #define BIO_TYPE_NONE 0
159 \& #define BIO_TYPE_MEM (1|0x0400)
160 \& #define BIO_TYPE_FILE (2|0x0400)
163 \& #define BIO_TYPE_FD (4|0x0400|0x0100)
164 \& #define BIO_TYPE_SOCKET (5|0x0400|0x0100)
165 \& #define BIO_TYPE_NULL (6|0x0400)
166 \& #define BIO_TYPE_SSL (7|0x0200)
167 \& #define BIO_TYPE_MD (8|0x0200)
168 \& #define BIO_TYPE_BUFFER (9|0x0200)
169 \& #define BIO_TYPE_CIPHER (10|0x0200)
170 \& #define BIO_TYPE_BASE64 (11|0x0200)
171 \& #define BIO_TYPE_CONNECT (12|0x0400|0x0100)
172 \& #define BIO_TYPE_ACCEPT (13|0x0400|0x0100)
173 \& #define BIO_TYPE_PROXY_CLIENT (14|0x0200)
174 \& #define BIO_TYPE_PROXY_SERVER (15|0x0200)
175 \& #define BIO_TYPE_NBIO_TEST (16|0x0200)
176 \& #define BIO_TYPE_NULL_FILTER (17|0x0200)
177 \& #define BIO_TYPE_BER (18|0x0200)
178 \& #define BIO_TYPE_BIO (19|0x0400)
181 \& #define BIO_TYPE_DESCRIPTOR 0x0100
182 \& #define BIO_TYPE_FILTER 0x0200
183 \& #define BIO_TYPE_SOURCE_SINK 0x0400
186 .IX Header "DESCRIPTION"
187 The \fIBIO_find_type()\fR searches for a \s-1BIO\s0 of a given type in a chain, starting
188 at \s-1BIO\s0 \fBb\fR. If \fBtype\fR is a specific type (such as \s-1BIO_TYPE_MEM\s0) then a search
189 is made for a \s-1BIO\s0 of that type. If \fBtype\fR is a general type (such as
190 \&\fB\s-1BIO_TYPE_SOURCE_SINK\s0\fR) then the next matching \s-1BIO\s0 of the given general type is
191 searched for. \fIBIO_find_type()\fR returns the next matching \s-1BIO\s0 or \s-1NULL\s0 if none is
194 Note: not all the \fBBIO_TYPE_*\fR types above have corresponding \s-1BIO\s0 implementations.
196 \&\fIBIO_next()\fR returns the next \s-1BIO\s0 in a chain. It can be used to traverse all BIOs
197 in a chain or used in conjunction with \fIBIO_find_type()\fR to find all BIOs of a
200 \&\fIBIO_method_type()\fR returns the type of a \s-1BIO\s0.
202 .IX Header "RETURN VALUES"
203 \&\fIBIO_find_type()\fR returns a matching \s-1BIO\s0 or \s-1NULL\s0 for no match.
205 \&\fIBIO_next()\fR returns the next \s-1BIO\s0 in a chain.
207 \&\fIBIO_method_type()\fR returns the type of the \s-1BIO\s0 \fBb\fR.
210 \&\fIBIO_next()\fR was added to OpenSSL 0.9.6 to provide a 'clean' way to traverse a \s-1BIO\s0
211 chain or find multiple matches using \fIBIO_find_type()\fR. Previous versions had to
215 \& next = bio->next_bio;
219 \&\fIBIO_find_type()\fR in OpenSSL 0.9.5a and earlier could not be safely passed a
220 \&\s-1NULL\s0 pointer for the \fBb\fR argument.
223 Traverse a chain looking for digest BIOs:
227 \& btmp = in_bio; /* in_bio is chain to search through */
231 \& btmp = BIO_find_type(btmp, BIO_TYPE_MD);
232 \& if(btmp == NULL) break; /* Not found */
233 \& /* btmp is a digest BIO, do something with it ...*/
237 \& btmp = BIO_next(btmp);
241 .IX Header "SEE ALSO"