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| 132 | .\" ======================================================================== |
| 133 | .\" |
| 134 | .IX Title "BIO_find_type 3" |
| 135 | .TH BIO_find_type 3 "2009-01-11" "0.9.8j" "OpenSSL" |
| 136 | .\" For nroff, turn off justification. Always turn off hyphenation; it makes |
| 137 | .\" way too many mistakes in technical documents. |
| 138 | .if n .ad l |
| 139 | .nh |
| 140 | .SH "NAME" |
| 141 | BIO_find_type, BIO_next \- BIO chain traversal |
| 142 | .SH "SYNOPSIS" |
| 143 | .IX Header "SYNOPSIS" |
| 144 | .Vb 1 |
| 145 | \& #include <openssl/bio.h> |
| 146 | \& |
| 147 | \& BIO * BIO_find_type(BIO *b,int bio_type); |
| 148 | \& BIO * BIO_next(BIO *b); |
| 149 | \& |
| 150 | \& #define BIO_method_type(b) ((b)\->method\->type) |
| 151 | \& |
| 152 | \& #define BIO_TYPE_NONE 0 |
| 153 | \& #define BIO_TYPE_MEM (1|0x0400) |
| 154 | \& #define BIO_TYPE_FILE (2|0x0400) |
| 155 | \& |
| 156 | \& #define BIO_TYPE_FD (4|0x0400|0x0100) |
| 157 | \& #define BIO_TYPE_SOCKET (5|0x0400|0x0100) |
| 158 | \& #define BIO_TYPE_NULL (6|0x0400) |
| 159 | \& #define BIO_TYPE_SSL (7|0x0200) |
| 160 | \& #define BIO_TYPE_MD (8|0x0200) |
| 161 | \& #define BIO_TYPE_BUFFER (9|0x0200) |
| 162 | \& #define BIO_TYPE_CIPHER (10|0x0200) |
| 163 | \& #define BIO_TYPE_BASE64 (11|0x0200) |
| 164 | \& #define BIO_TYPE_CONNECT (12|0x0400|0x0100) |
| 165 | \& #define BIO_TYPE_ACCEPT (13|0x0400|0x0100) |
| 166 | \& #define BIO_TYPE_PROXY_CLIENT (14|0x0200) |
| 167 | \& #define BIO_TYPE_PROXY_SERVER (15|0x0200) |
| 168 | \& #define BIO_TYPE_NBIO_TEST (16|0x0200) |
| 169 | \& #define BIO_TYPE_NULL_FILTER (17|0x0200) |
| 170 | \& #define BIO_TYPE_BER (18|0x0200) |
| 171 | \& #define BIO_TYPE_BIO (19|0x0400) |
| 172 | \& |
| 173 | \& #define BIO_TYPE_DESCRIPTOR 0x0100 |
| 174 | \& #define BIO_TYPE_FILTER 0x0200 |
| 175 | \& #define BIO_TYPE_SOURCE_SINK 0x0400 |
| 176 | .Ve |
| 177 | .SH "DESCRIPTION" |
| 178 | .IX Header "DESCRIPTION" |
| 179 | The \fIBIO_find_type()\fR searches for a \s-1BIO\s0 of a given type in a chain, starting |
| 180 | at \s-1BIO\s0 \fBb\fR. If \fBtype\fR is a specific type (such as \s-1BIO_TYPE_MEM\s0) then a search |
| 181 | is made for a \s-1BIO\s0 of that type. If \fBtype\fR is a general type (such as |
| 182 | \&\fB\s-1BIO_TYPE_SOURCE_SINK\s0\fR) then the next matching \s-1BIO\s0 of the given general type is |
| 183 | searched for. \fIBIO_find_type()\fR returns the next matching \s-1BIO\s0 or \s-1NULL\s0 if none is |
| 184 | found. |
| 185 | .PP |
| 186 | Note: not all the \fBBIO_TYPE_*\fR types above have corresponding \s-1BIO\s0 implementations. |
| 187 | .PP |
| 188 | \&\fIBIO_next()\fR returns the next \s-1BIO\s0 in a chain. It can be used to traverse all BIOs |
| 189 | in a chain or used in conjunction with \fIBIO_find_type()\fR to find all BIOs of a |
| 190 | certain type. |
| 191 | .PP |
| 192 | \&\fIBIO_method_type()\fR returns the type of a \s-1BIO\s0. |
| 193 | .SH "RETURN VALUES" |
| 194 | .IX Header "RETURN VALUES" |
| 195 | \&\fIBIO_find_type()\fR returns a matching \s-1BIO\s0 or \s-1NULL\s0 for no match. |
| 196 | .PP |
| 197 | \&\fIBIO_next()\fR returns the next \s-1BIO\s0 in a chain. |
| 198 | .PP |
| 199 | \&\fIBIO_method_type()\fR returns the type of the \s-1BIO\s0 \fBb\fR. |
| 200 | .SH "NOTES" |
| 201 | .IX Header "NOTES" |
| 202 | \&\fIBIO_next()\fR was added to OpenSSL 0.9.6 to provide a 'clean' way to traverse a \s-1BIO\s0 |
| 203 | chain or find multiple matches using \fIBIO_find_type()\fR. Previous versions had to |
| 204 | use: |
| 205 | .PP |
| 206 | .Vb 1 |
| 207 | \& next = bio\->next_bio; |
| 208 | .Ve |
| 209 | .SH "BUGS" |
| 210 | .IX Header "BUGS" |
| 211 | \&\fIBIO_find_type()\fR in OpenSSL 0.9.5a and earlier could not be safely passed a |
| 212 | \&\s-1NULL\s0 pointer for the \fBb\fR argument. |
| 213 | .SH "EXAMPLE" |
| 214 | .IX Header "EXAMPLE" |
| 215 | Traverse a chain looking for digest BIOs: |
| 216 | .PP |
| 217 | .Vb 2 |
| 218 | \& BIO *btmp; |
| 219 | \& btmp = in_bio; /* in_bio is chain to search through */ |
| 220 | \& |
| 221 | \& do { |
| 222 | \& btmp = BIO_find_type(btmp, BIO_TYPE_MD); |
| 223 | \& if(btmp == NULL) break; /* Not found */ |
| 224 | \& /* btmp is a digest BIO, do something with it ...*/ |
| 225 | \& ... |
| 226 | \& |
| 227 | \& btmp = BIO_next(btmp); |
| 228 | \& } while(btmp); |
| 229 | .Ve |
| 230 | .SH "SEE ALSO" |
| 231 | .IX Header "SEE ALSO" |
| 232 | \&\s-1TBA\s0 |