1/*
2 * libwebsockets - small server side websockets and web server implementation
3 *
4 * Copyright (C) 2010 - 2019 Andy Green <andy@warmcat.com>
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to
8 * deal in the Software without restriction, including without limitation the
9 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
10 * sell copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
19 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
21 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
22 * IN THE SOFTWARE.
23 */
24
25#ifndef _WINSOCK_DEPRECATED_NO_WARNINGS
26#define _WINSOCK_DEPRECATED_NO_WARNINGS
27#endif
28#include "private-lib-core.h"
29
30/*
31 * ie, if the plugins api needed at all
32 */
33
34#if defined(LWS_WITH_PLUGINS_API) && (UV_VERSION_MAJOR > 0)
35
36const lws_plugin_header_t *
37lws_plat_dlopen(struct lws_plugin **pplugin, const char *libpath,
38		const char *sofilename, const char *_class,
39		each_plugin_cb_t each, void *each_user)
40{
41	const lws_plugin_header_t *hdr;
42	struct lws_plugin *pin;
43	char sym[96], *dot;
44	uv_lib_t lib;
45	void *v;
46	int m;
47
48	lib.errmsg = NULL;
49	lib.handle = NULL;
50
51	if (uv_dlopen(libpath, &lib)) {
52		uv_dlerror(&lib);
53		lwsl_err("Error loading DSO: %s\n", lib.errmsg);
54		uv_dlclose(&lib);
55		return NULL;
56	}
57
58	/* we could open it... can we get his export struct? */
59	m = lws_snprintf(sym, sizeof(sym) - 1, "%s", sofilename);
60	if (m < 4)
61		goto bail;
62	dot = strchr(sym, '.');
63	if (dot)
64		*dot = '\0'; /* snip the .so or .lib or what-have-you*/
65
66	if (uv_dlsym(&lib, sym, &v)) {
67		uv_dlerror(&lib);
68		lwsl_err("%s: Failed to get '%s' on %s: %s\n",
69			 __func__, path, libpath, lib.errmsg);
70		goto bail;
71	}
72
73	hdr = (const lws_plugin_header_t *)v;
74	if (hdr->api_magic != LWS_PLUGIN_API_MAGIC) {
75		lwsl_info("%s: plugin %s has outdated api %d (vs %d)\n",
76			 __func__, libpath, hdr->api_magic,
77			 LWS_PLUGIN_API_MAGIC);
78		goto bail;
79	}
80
81	if (strcmp(hdr->lws_build_hash, LWS_BUILD_HASH))
82		goto bail;
83
84	if (strcmp(hdr->_class, _class))
85		goto bail;
86
87	/*
88	 * We don't already have one of these, right?
89	 */
90
91	pin = *pplugin;
92	while (pin) {
93		if (!strcmp(pin->hdr->name, hdr->name))
94			goto bail;
95		pin = pin->list;
96	}
97
98	/*
99	 * OK let's bring it in
100	 */
101
102	pin = lws_malloc(sizeof(*pin), __func__);
103	if (!pin)
104		goto bail;
105
106	pin->list = *pplugin;
107	*pplugin = pin;
108
109	pin->u.lib = lib;
110	pin->hdr = hdr;
111
112	if (each)
113		each(pin, each_user);
114
115	return hdr;
116
117bail:
118	uv_dlclose(&lib);
119
120	return NULL;
121}
122
123int
124lws_plat_destroy_dl(struct lws_plugin *p)
125{
126	uv_dlclose(&p->u.lib);
127
128	return 0;
129}
130
131#endif
132
133/*
134 * Specifically for protocol plugins support
135 */
136
137#if defined(LWS_WITH_PLUGINS) && (UV_VERSION_MAJOR > 0)
138
139static int
140protocol_plugin_cb(struct lws_plugin *pin, void *each_user)
141{
142	struct lws_context *context = (struct lws_context *)each_user;
143	const lws_plugin_protocol_t *plpr =
144				(const lws_plugin_protocol_t *)pin->hdr;
145
146	context->plugin_protocol_count += plpr->count_protocols;
147	context->plugin_extension_count += plpr->count_extensions;
148
149	return 0;
150}
151#endif
152
153int
154lws_plat_plugins_init(struct lws_context *context, const char * const *d)
155{
156#if defined(LWS_WITH_PLUGINS) && (UV_VERSION_MAJOR > 0)
157	if (info->plugin_dirs) {
158		uv_loop_init(&context->uv.loop);
159		lws_plugins_init(&context->plugin_list, info->plugin_dirs,
160				 "lws_protocol_plugin", NULL,
161				 protocol_plugin_cb, context);
162	}
163#endif
164
165	return 0;
166}
167
168int
169lws_plat_plugins_destroy(struct lws_context * context)
170{
171#if defined(LWS_WITH_PLUGINS) && (UV_VERSION_MAJOR > 0)
172	if (lws_check_opt(context->options, LWS_SERVER_OPTION_LIBUV) &&
173	    context->plugin_list) {
174		lws_plugins_destroy(&context->plugin_list, NULL, NULL);
175		while (uv_loop_close(&context->uv.loop))
176			;
177	}
178#endif
179
180	return 0;
181}
182