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/*
* librdkafka - The Apache Kafka C/C++ library
*
* Copyright (c) 2017 Magnus Edenhill
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS 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 COPYRIGHT OWNER OR 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.
*/
#include "rd.h"
#include "rddl.h"
#if WITH_LIBDL
#include <dlfcn.h>
#elif defined(_WIN32)
#else
#error "Dynamic library loading not supported on this platform"
#endif
/**
* @brief Latest thread-local dl error, normalized to suit our logging.
* @returns a newly allocated string that must be freed
*/
static char *rd_dl_error(void) {
#if WITH_LIBDL
char *errstr;
char *s;
errstr = dlerror();
if (!errstr)
return rd_strdup("No error returned from dlerror()");
errstr = rd_strdup(errstr);
/* Change newlines to separators. */
while ((s = strchr(errstr, '\n')))
*s = '.';
return errstr;
#elif defined(_WIN32)
char buf[1024];
rd_strerror_w32(GetLastError(), buf, sizeof(buf));
return rd_strdup(buf);
#endif
}
/**
* @brief Attempt to load library \p path.
* @returns the library handle (platform dependent, thus opaque) on success,
* else NULL.
*/
static rd_dl_hnd_t *
rd_dl_open0(const char *path, char *errstr, size_t errstr_size) {
void *handle;
const char *loadfunc;
#if WITH_LIBDL
loadfunc = "dlopen()";
handle = dlopen(path, RTLD_NOW | RTLD_LOCAL);
#elif defined(_WIN32)
loadfunc = "LoadLibrary()";
handle = (void *)LoadLibraryA(path);
#endif
if (!handle) {
char *dlerrstr = rd_dl_error();
rd_snprintf(errstr, errstr_size, "%s failed: %s", loadfunc,
dlerrstr);
rd_free(dlerrstr);
}
return (rd_dl_hnd_t *)handle;
}
/**
* @brief Attempt to load library \p path, possibly with a filename extension
* which will be automatically resolved depending on platform.
* @returns the library handle (platform dependent, thus opaque) on success,
* else NULL.
*/
rd_dl_hnd_t *rd_dl_open(const char *path, char *errstr, size_t errstr_size) {
rd_dl_hnd_t *handle;
char *extpath;
size_t pathlen;
const char *td, *fname;
const char *solib_ext = SOLIB_EXT;
/* Try original path first. */
handle = rd_dl_open0(path, errstr, errstr_size);
if (handle)
return handle;
/* Original path not found, see if we can append the solib_ext
* filename extension. */
/* Get filename and filename extension.
* We can't rely on basename(3) since it is not portable */
fname = strrchr(path, '/');
#ifdef _WIN32
td = strrchr(path, '\\');
if (td > fname)
fname = td;
#endif
if (!fname)
fname = path;
td = strrchr(fname, '.');
/* If there is a filename extension ('.' within the last characters)
* then bail out, we will not append an extension in this case. */
if (td && td >= fname + strlen(fname) - strlen(SOLIB_EXT))
return NULL;
/* Append platform-specific library extension. */
pathlen = strlen(path);
extpath = rd_alloca(pathlen + strlen(solib_ext) + 1);
memcpy(extpath, path, pathlen);
memcpy(extpath + pathlen, solib_ext, strlen(solib_ext) + 1);
/* Try again with extension */
return rd_dl_open0(extpath, errstr, errstr_size);
}
/**
* @brief Close handle previously returned by rd_dl_open()
* @remark errors are ignored (what can we do anyway?)
*/
void rd_dl_close(rd_dl_hnd_t *handle) {
#if WITH_LIBDL
dlclose((void *)handle);
#elif defined(_WIN32)
FreeLibrary((HMODULE)handle);
#endif
}
/**
* @brief look up address of \p symbol in library handle \p handle
* @returns the function pointer on success or NULL on error.
*/
void *rd_dl_sym(rd_dl_hnd_t *handle,
const char *symbol,
char *errstr,
size_t errstr_size) {
void *func;
#if WITH_LIBDL
func = dlsym((void *)handle, symbol);
#elif defined(_WIN32)
func = GetProcAddress((HMODULE)handle, symbol);
#endif
if (!func) {
char *dlerrstr = rd_dl_error();
rd_snprintf(errstr, errstr_size,
"Failed to load symbol \"%s\": %s", symbol,
dlerrstr);
rd_free(dlerrstr);
}
return func;
}
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