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Diffstat (limited to 'crypto/dso/dso_dlfcn.c')
| -rw-r--r-- | crypto/dso/dso_dlfcn.c | 179 |
1 files changed, 179 insertions, 0 deletions
diff --git a/crypto/dso/dso_dlfcn.c b/crypto/dso/dso_dlfcn.c new file mode 100644 index 0000000..e9741c5 --- /dev/null +++ b/crypto/dso/dso_dlfcn.c @@ -0,0 +1,179 @@ +/* dso_dlfcn.c */ +/* Written by Geoff Thorpe (geoff@geoffthorpe.net) for the OpenSSL + * project 2000. + */ +/* ==================================================================== + * Copyright (c) 2000 The OpenSSL Project. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * + * 3. All advertising materials mentioning features or use of this + * software must display the following acknowledgment: + * "This product includes software developed by the OpenSSL Project + * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" + * + * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to + * endorse or promote products derived from this software without + * prior written permission. For written permission, please contact + * licensing@OpenSSL.org. + * + * 5. Products derived from this software may not be called "OpenSSL" + * nor may "OpenSSL" appear in their names without prior written + * permission of the OpenSSL Project. + * + * 6. Redistributions of any form whatsoever must retain the following + * acknowledgment: + * "This product includes software developed by the OpenSSL Project + * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" + * + * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY + * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR + * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR + * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT + * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; + * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, + * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED + * OF THE POSSIBILITY OF SUCH DAMAGE. + * ==================================================================== + * + * This product includes cryptographic software written by Eric Young + * (eay@cryptsoft.com). This product includes software written by Tim + * Hudson (tjh@cryptsoft.com). + * + */ + +#include <stdio.h> +#include "cryptlib.h" +#include <openssl/dso.h> + +#ifndef DSO_DLFCN +DSO_METHOD *DSO_METHOD_dlfcn(void) + { + return NULL; + } +#else + +#include <dlfcn.h> + +static int dlfcn_load(DSO *dso, char *filename); +static int dlfcn_unload(DSO *dso); +static int dlfcn_bind(DSO *dso, char *symname, void **symptr); +#if 0 +static int dlfcn_unbind(DSO *dso, char *symname, void *symptr); +static int dlfcn_init(DSO *dso); +static int dlfcn_finish(DSO *dso); +#endif + +static DSO_METHOD dso_meth_dlfcn = { + "OpenSSL 'dlfcn' shared library method", + dlfcn_load, + dlfcn_unload, + dlfcn_bind, +/* For now, "unbind" doesn't exist */ +#if 0 + NULL, /* unbind */ +#endif + NULL, /* init */ + NULL /* finish */ + }; + +DSO_METHOD *DSO_METHOD_dlfcn(void) + { + return(&dso_meth_dlfcn); + } + +/* For this DSO_METHOD, our meth_data STACK will contain; + * (i) the handle (void*) returned from dlopen(). + */ + +static int dlfcn_load(DSO *dso, char *filename) + { + void *ptr; + + ptr = dlopen(filename, RTLD_NOW); + if(ptr == NULL) + { + DSOerr(DSO_F_DLFCN_LOAD,DSO_R_LOAD_FAILED); + return(0); + } + if(!sk_push(dso->meth_data, (char *)ptr)) + { + DSOerr(DSO_F_DLFCN_LOAD,DSO_R_STACK_ERROR); + dlclose(ptr); + return(0); + } + return(1); + } + +static int dlfcn_unload(DSO *dso) + { + void *ptr; + if(dso == NULL) + { + DSOerr(DSO_F_DLFCN_UNLOAD,ERR_R_PASSED_NULL_PARAMETER); + return(0); + } + if(sk_num(dso->meth_data) < 1) + { + DSOerr(DSO_F_DLFCN_UNLOAD,DSO_R_STACK_ERROR); + return(0); + } + ptr = (void *)sk_pop(dso->meth_data); + if(ptr == NULL) + { + DSOerr(DSO_F_DLFCN_UNLOAD,DSO_R_NULL_HANDLE); + /* Should push the value back onto the stack in + * case of a retry. */ + sk_push(dso->meth_data, (char *)ptr); + return(0); + } + /* For now I'm not aware of any errors associated with dlclose() */ + dlclose(ptr); + return(1); + } + +static int dlfcn_bind(DSO *dso, char *symname, void **symptr) + { + void *ptr, *sym; + + if((dso == NULL) || (symptr == NULL) || (symname == NULL)) + { + DSOerr(DSO_F_DLFCN_BIND,ERR_R_PASSED_NULL_PARAMETER); + return(0); + } + if(sk_num(dso->meth_data) < 1) + { + DSOerr(DSO_F_DLFCN_BIND,DSO_R_STACK_ERROR); + return(0); + } + ptr = (void *)sk_value(dso->meth_data, sk_num(dso->meth_data) - 1); + if(ptr == NULL) + { + DSOerr(DSO_F_DLFCN_BIND,DSO_R_NULL_HANDLE); + return(0); + } + sym = dlsym(ptr, symname); + if(sym == NULL) + { + DSOerr(DSO_F_DLFCN_BIND,DSO_R_SYM_FAILURE); + return(0); + } + *symptr = sym; + return(1); + } + +#endif /* DSO_DLFCN */ |