+++ /dev/null
-/*
-
- silcsim.c
-
- Author: Pekka Riikonen <priikone@silcnet.org>
-
- Copyright (C) 2000 Pekka Riikonen
-
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; version 2 of the License.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
-*/
-/*
- These routines implement the SILC Module (SIM) support. SIM's are
- dynamically run-time loaded shared objects that can implement some
- routines SILC can use to extend its features. Currently all
- SILC Crypto modules are implemented as SIM's. They all implement
- the SILC Crypto API and can be loaded run-time into the SILC and
- used when needed.
-
- Basically any SILC API can be implemented as SIM, however, currently
- only SILC Crypto modules (ciphers and hash functions (PKCS are not
- supported)) are supported.
-
- This implementation expects that no SILC specific symbols needs to
- be exported into the SIM's. This means that SIM's cannot directly
- use SILC specific symbols or definitions. This feature can be
- supported with SIM's but currently (with Crypto modules) this is
- not needed.
-
- NOTE: These routines maybe highly system dependant thus I can expect
- some heavy #ifdef's here. However, I'm more happy to see some macro
- SIM API and restrict the #ifdef's to silcsim.h file.
-
-*/
-
-#include "silc.h"
-
-/*
- SILC Module (SIM) Context.
-
- This context holds relevant information about the SIM loaded into
- the system. Following short description of the fields.
-
- void *handle
-
- Pointer to the SIM. This is used to get the symbols out of
- the SIM. This is initalized by system specific routine.
-
- SilcSimType type
-
- Type of the SIM.
-
- char *libname;
-
- Filename and path to the SIM library file.
-
- int flags
-
- Flags used with the SIM. These are system specific flags.
- See below for more information.
-
-*/
-struct SilcSimStruct {
- void *handle;
- SilcSimType type;
- char *libname;
- int flags;
-};
-
-#ifdef SILC_SIM /* SIM upport enabled */
-
-/* Allocates new SIM context. This is later send to all SIM
- routines. */
-
-SilcSim silc_sim_alloc(SilcSimType type, const char *libname,
- SilcUInt32 flags)
-{
- SilcSim sim;
-
- SILC_LOG_DEBUG(("Initializing new SIM context"));
-
- sim = silc_calloc(1, sizeof(*sim));
- if (!sim) {
- SILC_LOG_ERROR(("Could not allocate new SIM context"));
- return NULL;
- }
-
- sim->handle = NULL;
- sim->type = type;
- sim->libname = strdup(libname);
- sim->flags = !flags ? SILC_SIM_FLAGS : flags;
-
- return sim;
-}
-
-/* Free's SIM context. SIM must be closed with silc_sim_close before
- calling this. */
-
-void silc_sim_free(SilcSim sim)
-{
- assert(sim->handle == NULL);
- silc_free(sim->libname);
- silc_free(sim);
-}
-
-/* Loads SIM into the SILC system. */
-
-int silc_sim_load(SilcSim sim)
-{
- assert(sim != NULL);
-
- SILC_LOG_DEBUG(("Loading SIM '%s'", sim->libname));
-
- /* Load the library */
- sim->handle = dlopen(sim->libname, sim->flags);
- if (!sim->handle) {
- SILC_LOG_ERROR(("Error loading SIM: %s", silc_sim_error(sim)));
- return FALSE;
- }
-
- return TRUE;
-}
-
-/* Closes SIM. This is called when execution of program is ending or
- one explicitly wants to remove this SIM from SILC. */
-
-int silc_sim_close(SilcSim sim)
-{
- assert(sim != NULL);
-
- SILC_LOG_DEBUG(("Closing SIM '%s'", sim->libname));
-
- /* Close the library */
- dlclose(sim->handle);
- sim->handle = NULL;
-
- return TRUE;
-}
-
-/* Returns error string if error has occured while processing SIM's. */
-
-const char *silc_sim_error(SilcSim sim)
-{
- return dlerror();
-}
-
-/* Returns opaque pointer for a symbol in SIM. Caller must know the
- symbols they want to get from SIM and use the returned pointer to
- what ever it is intended. */
-
-void *silc_sim_getsym(SilcSim sim, const char *symbol)
-{
- assert(sim != NULL);
-
- SILC_LOG_DEBUG(("Getting symbol '%s' from SIM", symbol));
-
- return dlsym(sim->handle, symbol);
-}
-
-#endif /* SILC_SIM */
projects / crypto.git / blobdiff