125 lines
3.0 KiB
C
125 lines
3.0 KiB
C
/*
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* libwebsockets - small server side websockets and web server implementation
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*
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* Copyright (C) 2010 - 2020 Andy Green <andy@warmcat.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to
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* deal in the Software without restriction, including without limitation the
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* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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* sell copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*/
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#if !defined(_GNU_SOURCE)
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#define _GNU_SOURCE
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#endif
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#include "private-lib-core.h"
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#include <pwd.h>
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#include <grp.h>
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#include <dlfcn.h>
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const lws_plugin_header_t *
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lws_plat_dlopen(struct lws_plugin **pplugin, const char *libpath,
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const char *sofilename, const char *_class,
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each_plugin_cb_t each, void *each_user)
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{
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const lws_plugin_header_t *hdr;
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struct lws_plugin *pin;
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char sym[96];
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void *l;
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int m;
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if (strlen(sofilename) < 6)
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/* [lib]...[.so] */
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return NULL;
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lwsl_info(" trying %s\n", libpath);
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l = dlopen(libpath, RTLD_NOW);
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if (!l) {
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lwsl_info("%s: Error loading DSO: %s\n", __func__, dlerror());
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return NULL;
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}
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/* we could open it... can we get his export struct? */
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m = lws_snprintf(sym, sizeof(sym) - 1, "%s", sofilename);
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if (m < 4)
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goto bail;
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if (!strcmp(&sym[m - 3], ".so"))
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sym[m - 3] = '\0'; /* snip the .so */
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hdr = (const lws_plugin_header_t *)dlsym(l, sym);
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if (!hdr) {
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lwsl_info("%s: Failed to get export '%s' from %s: %s\n",
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__func__, sym, libpath, dlerror());
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goto bail;
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}
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if (hdr->api_magic != LWS_PLUGIN_API_MAGIC) {
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lwsl_info("%s: plugin %s has outdated api %d (vs %d)\n",
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__func__, libpath, hdr->api_magic,
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LWS_PLUGIN_API_MAGIC);
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goto bail;
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}
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if (strcmp(hdr->lws_build_hash, LWS_BUILD_HASH))
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goto bail;
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if (strcmp(hdr->_class, _class))
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goto bail;
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/*
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* We don't already have one of these, right?
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*/
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pin = *pplugin;
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while (pin) {
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if (!strcmp(pin->hdr->name, hdr->name))
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goto bail;
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pin = pin->list;
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}
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/*
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* OK let's bring it in
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*/
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pin = lws_plugin_alloc(pplugin);
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if (!pin)
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goto bail;
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pin->u.l = l;
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pin->hdr = hdr;
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if (each)
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each(pin, each_user);
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lwsl_notice(" %s\n", libpath);
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return hdr;
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bail:
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dlclose(l);
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return NULL;
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}
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int
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lws_plat_destroy_dl(struct lws_plugin *p)
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{
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return dlclose(p->u.l);
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}
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