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Add a DSO_dsobyaddr() function

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This works the same way as DSO_pathbyaddr() but instead returns a ptr to
the DSO that contains the provided symbol.

Reviewed-by: Tim Hudson <tjh@openssl.org>
This commit is contained in:
Matt Caswell 2016-10-15 16:01:40 +01:00
parent cb6ea61c16
commit b39eda7ee6
3 changed files with 32 additions and 3 deletions
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23
crypto/dso/dso_lib.c
View File

@ -73,9 +73,11 @@ int DSO_free(DSO *dso)
return 1; return 1;
REF_ASSERT_ISNT(i < 0); REF_ASSERT_ISNT(i < 0);
if ((dso->meth->dso_unload != NULL) && !dso->meth->dso_unload(dso)) { if ((dso->flags & DSO_FLAG_NO_UNLOAD_ON_FREE) == 0) {
DSOerr(DSO_F_DSO_FREE, DSO_R_UNLOAD_FAILED); if ((dso->meth->dso_unload != NULL) && !dso->meth->dso_unload(dso)) {
return 0; DSOerr(DSO_F_DSO_FREE, DSO_R_UNLOAD_FAILED);
return 0;
}
} }
if ((dso->meth->finish != NULL) && !dso->meth->finish(dso)) { if ((dso->meth->finish != NULL) && !dso->meth->finish(dso)) {
@ -316,6 +318,21 @@ int DSO_pathbyaddr(void *addr, char *path, int sz)
return (*meth->pathbyaddr) (addr, path, sz); return (*meth->pathbyaddr) (addr, path, sz);
} }
DSO *DSO_dsobyaddr(void *addr, int flags)
{
DSO *ret = NULL;
char *filename = NULL;
int len = DSO_pathbyaddr(addr, NULL, 0);
filename = OPENSSL_malloc(len);
if (filename != NULL
&& DSO_pathbyaddr(addr, filename, len) == len)
ret = DSO_load(NULL, filename, NULL, flags);
OPENSSL_free(filename);
return ret;
}
void *DSO_global_lookup(const char *name) void *DSO_global_lookup(const char *name)
{ {
DSO_METHOD *meth = default_DSO_meth; DSO_METHOD *meth = default_DSO_meth;

11
include/internal/dso.h
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@ -42,6 +42,11 @@ extern "C" {
*/ */
# define DSO_FLAG_NAME_TRANSLATION_EXT_ONLY 0x02 # define DSO_FLAG_NAME_TRANSLATION_EXT_ONLY 0x02
/*
* Don't unload the DSO when we call DSO_free()
*/
# define DSO_FLAG_NO_UNLOAD_ON_FREE 0x04
/* /*
* This flag loads the library with public symbols. Meaning: The exported * This flag loads the library with public symbols. Meaning: The exported
* symbols of this library are public to all libraries loaded after this * symbols of this library are public to all libraries loaded after this
@ -141,6 +146,12 @@ DSO_METHOD *DSO_METHOD_openssl(void);
*/ */
int DSO_pathbyaddr(void *addr, char *path, int sz); int DSO_pathbyaddr(void *addr, char *path, int sz);
/*
* Like DSO_pathbyaddr() but instead returns a handle to the DSO for the symbol
* or NULL on error.
*/
DSO *DSO_dsobyaddr(void *addr, int flags);
/* /*
* This function should be used with caution! It looks up symbols in *all* * This function should be used with caution! It looks up symbols in *all*
* loaded modules and if module gets unloaded by somebody else attempt to * loaded modules and if module gets unloaded by somebody else attempt to

1
util/libcrypto.num
View File

@ -4217,3 +4217,4 @@ BIO_write_ex 4167 1_1_1 EXIST::FUNCTION:
BIO_meth_get_write_ex 4168 1_1_1 EXIST::FUNCTION: BIO_meth_get_write_ex 4168 1_1_1 EXIST::FUNCTION:
BIO_meth_set_write_ex 4169 1_1_1 EXIST::FUNCTION: BIO_meth_set_write_ex 4169 1_1_1 EXIST::FUNCTION:
DSO_pathbyaddr 4170 1_1_0c EXIST::FUNCTION: DSO_pathbyaddr 4170 1_1_0c EXIST::FUNCTION:
DSO_dsobyaddr 4171 1_1_0c EXIST::FUNCTION: