xref: /aosp_15_r20/external/libwebsockets/lib/plat/unix/unix-plugins.c (revision 1c60b9aca93fdbc9b5f19b2d2194c91294b22281)
1*1c60b9acSAndroid Build Coastguard Worker /*
2*1c60b9acSAndroid Build Coastguard Worker  * libwebsockets - small server side websockets and web server implementation
3*1c60b9acSAndroid Build Coastguard Worker  *
4*1c60b9acSAndroid Build Coastguard Worker  * Copyright (C) 2010 - 2020 Andy Green <[email protected]>
5*1c60b9acSAndroid Build Coastguard Worker  *
6*1c60b9acSAndroid Build Coastguard Worker  * Permission is hereby granted, free of charge, to any person obtaining a copy
7*1c60b9acSAndroid Build Coastguard Worker  * of this software and associated documentation files (the "Software"), to
8*1c60b9acSAndroid Build Coastguard Worker  * deal in the Software without restriction, including without limitation the
9*1c60b9acSAndroid Build Coastguard Worker  * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
10*1c60b9acSAndroid Build Coastguard Worker  * sell copies of the Software, and to permit persons to whom the Software is
11*1c60b9acSAndroid Build Coastguard Worker  * furnished to do so, subject to the following conditions:
12*1c60b9acSAndroid Build Coastguard Worker  *
13*1c60b9acSAndroid Build Coastguard Worker  * The above copyright notice and this permission notice shall be included in
14*1c60b9acSAndroid Build Coastguard Worker  * all copies or substantial portions of the Software.
15*1c60b9acSAndroid Build Coastguard Worker  *
16*1c60b9acSAndroid Build Coastguard Worker  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17*1c60b9acSAndroid Build Coastguard Worker  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18*1c60b9acSAndroid Build Coastguard Worker  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
19*1c60b9acSAndroid Build Coastguard Worker  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20*1c60b9acSAndroid Build Coastguard Worker  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
21*1c60b9acSAndroid Build Coastguard Worker  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
22*1c60b9acSAndroid Build Coastguard Worker  * IN THE SOFTWARE.
23*1c60b9acSAndroid Build Coastguard Worker  */
24*1c60b9acSAndroid Build Coastguard Worker 
25*1c60b9acSAndroid Build Coastguard Worker #if !defined(_GNU_SOURCE)
26*1c60b9acSAndroid Build Coastguard Worker #define _GNU_SOURCE
27*1c60b9acSAndroid Build Coastguard Worker #endif
28*1c60b9acSAndroid Build Coastguard Worker #include "private-lib-core.h"
29*1c60b9acSAndroid Build Coastguard Worker 
30*1c60b9acSAndroid Build Coastguard Worker #include <pwd.h>
31*1c60b9acSAndroid Build Coastguard Worker #include <grp.h>
32*1c60b9acSAndroid Build Coastguard Worker #include <dlfcn.h>
33*1c60b9acSAndroid Build Coastguard Worker 
34*1c60b9acSAndroid Build Coastguard Worker const lws_plugin_header_t *
lws_plat_dlopen(struct lws_plugin ** pplugin,const char * libpath,const char * sofilename,const char * _class,each_plugin_cb_t each,void * each_user)35*1c60b9acSAndroid Build Coastguard Worker lws_plat_dlopen(struct lws_plugin **pplugin, const char *libpath,
36*1c60b9acSAndroid Build Coastguard Worker 		const char *sofilename, const char *_class,
37*1c60b9acSAndroid Build Coastguard Worker 		each_plugin_cb_t each, void *each_user)
38*1c60b9acSAndroid Build Coastguard Worker {
39*1c60b9acSAndroid Build Coastguard Worker 	const lws_plugin_header_t *hdr;
40*1c60b9acSAndroid Build Coastguard Worker 	struct lws_plugin *pin;
41*1c60b9acSAndroid Build Coastguard Worker 	char sym[96];
42*1c60b9acSAndroid Build Coastguard Worker 	void *l;
43*1c60b9acSAndroid Build Coastguard Worker 	int m;
44*1c60b9acSAndroid Build Coastguard Worker 
45*1c60b9acSAndroid Build Coastguard Worker 	if (strlen(sofilename) < 6)
46*1c60b9acSAndroid Build Coastguard Worker 		/* [lib]...[.so] */
47*1c60b9acSAndroid Build Coastguard Worker 		return NULL;
48*1c60b9acSAndroid Build Coastguard Worker 
49*1c60b9acSAndroid Build Coastguard Worker 	lwsl_info("   trying %s\n", libpath);
50*1c60b9acSAndroid Build Coastguard Worker 
51*1c60b9acSAndroid Build Coastguard Worker 	l = dlopen(libpath, RTLD_NOW);
52*1c60b9acSAndroid Build Coastguard Worker 	if (!l) {
53*1c60b9acSAndroid Build Coastguard Worker 		lwsl_info("%s: Error loading DSO: %s\n", __func__, dlerror());
54*1c60b9acSAndroid Build Coastguard Worker 
55*1c60b9acSAndroid Build Coastguard Worker 		return NULL;
56*1c60b9acSAndroid Build Coastguard Worker 	}
57*1c60b9acSAndroid Build Coastguard Worker 
58*1c60b9acSAndroid Build Coastguard Worker 	/* we could open it... can we get his export struct? */
59*1c60b9acSAndroid Build Coastguard Worker 	m = lws_snprintf(sym, sizeof(sym) - 1, "%s", sofilename);
60*1c60b9acSAndroid Build Coastguard Worker 	if (m < 4)
61*1c60b9acSAndroid Build Coastguard Worker 		goto bail;
62*1c60b9acSAndroid Build Coastguard Worker 	if (!strcmp(&sym[m - 3], ".so"))
63*1c60b9acSAndroid Build Coastguard Worker 		sym[m - 3] = '\0'; /* snip the .so */
64*1c60b9acSAndroid Build Coastguard Worker 
65*1c60b9acSAndroid Build Coastguard Worker 	hdr = (const lws_plugin_header_t *)dlsym(l, sym);
66*1c60b9acSAndroid Build Coastguard Worker 	if (!hdr) {
67*1c60b9acSAndroid Build Coastguard Worker 		lwsl_info("%s: Failed to get export '%s' from %s: %s\n",
68*1c60b9acSAndroid Build Coastguard Worker 			 __func__, sym, libpath, dlerror());
69*1c60b9acSAndroid Build Coastguard Worker 		goto bail;
70*1c60b9acSAndroid Build Coastguard Worker 	}
71*1c60b9acSAndroid Build Coastguard Worker 
72*1c60b9acSAndroid Build Coastguard Worker 	if (hdr->api_magic != LWS_PLUGIN_API_MAGIC) {
73*1c60b9acSAndroid Build Coastguard Worker 		lwsl_info("%s: plugin %s has outdated api %d (vs %d)\n",
74*1c60b9acSAndroid Build Coastguard Worker 			 __func__, libpath, hdr->api_magic,
75*1c60b9acSAndroid Build Coastguard Worker 			 LWS_PLUGIN_API_MAGIC);
76*1c60b9acSAndroid Build Coastguard Worker 		goto bail;
77*1c60b9acSAndroid Build Coastguard Worker 	}
78*1c60b9acSAndroid Build Coastguard Worker 
79*1c60b9acSAndroid Build Coastguard Worker 	if (strcmp(hdr->lws_build_hash, LWS_BUILD_HASH))
80*1c60b9acSAndroid Build Coastguard Worker 		goto bail;
81*1c60b9acSAndroid Build Coastguard Worker 
82*1c60b9acSAndroid Build Coastguard Worker 	if (strcmp(hdr->_class, _class))
83*1c60b9acSAndroid Build Coastguard Worker 		goto bail;
84*1c60b9acSAndroid Build Coastguard Worker 
85*1c60b9acSAndroid Build Coastguard Worker 	/*
86*1c60b9acSAndroid Build Coastguard Worker 	 * We don't already have one of these, right?
87*1c60b9acSAndroid Build Coastguard Worker 	 */
88*1c60b9acSAndroid Build Coastguard Worker 
89*1c60b9acSAndroid Build Coastguard Worker 	pin = *pplugin;
90*1c60b9acSAndroid Build Coastguard Worker 	while (pin) {
91*1c60b9acSAndroid Build Coastguard Worker 		if (!strcmp(pin->hdr->name, hdr->name))
92*1c60b9acSAndroid Build Coastguard Worker 			goto bail;
93*1c60b9acSAndroid Build Coastguard Worker 		pin = pin->list;
94*1c60b9acSAndroid Build Coastguard Worker 	}
95*1c60b9acSAndroid Build Coastguard Worker 
96*1c60b9acSAndroid Build Coastguard Worker 	/*
97*1c60b9acSAndroid Build Coastguard Worker 	 * OK let's bring it in
98*1c60b9acSAndroid Build Coastguard Worker 	 */
99*1c60b9acSAndroid Build Coastguard Worker 
100*1c60b9acSAndroid Build Coastguard Worker 	pin = lws_malloc(sizeof(*pin), __func__);
101*1c60b9acSAndroid Build Coastguard Worker 	if (!pin)
102*1c60b9acSAndroid Build Coastguard Worker 		goto bail;
103*1c60b9acSAndroid Build Coastguard Worker 
104*1c60b9acSAndroid Build Coastguard Worker 	pin->list = *pplugin;
105*1c60b9acSAndroid Build Coastguard Worker 	*pplugin = pin;
106*1c60b9acSAndroid Build Coastguard Worker 
107*1c60b9acSAndroid Build Coastguard Worker 	pin->u.l = l;
108*1c60b9acSAndroid Build Coastguard Worker 	pin->hdr = hdr;
109*1c60b9acSAndroid Build Coastguard Worker 
110*1c60b9acSAndroid Build Coastguard Worker 	if (each)
111*1c60b9acSAndroid Build Coastguard Worker 		each(pin, each_user);
112*1c60b9acSAndroid Build Coastguard Worker 
113*1c60b9acSAndroid Build Coastguard Worker 	lwsl_notice("   %s\n", libpath);
114*1c60b9acSAndroid Build Coastguard Worker 
115*1c60b9acSAndroid Build Coastguard Worker 	return hdr;
116*1c60b9acSAndroid Build Coastguard Worker 
117*1c60b9acSAndroid Build Coastguard Worker bail:
118*1c60b9acSAndroid Build Coastguard Worker 	dlclose(l);
119*1c60b9acSAndroid Build Coastguard Worker 
120*1c60b9acSAndroid Build Coastguard Worker 	return NULL;
121*1c60b9acSAndroid Build Coastguard Worker }
122*1c60b9acSAndroid Build Coastguard Worker 
123*1c60b9acSAndroid Build Coastguard Worker int
lws_plat_destroy_dl(struct lws_plugin * p)124*1c60b9acSAndroid Build Coastguard Worker lws_plat_destroy_dl(struct lws_plugin *p)
125*1c60b9acSAndroid Build Coastguard Worker {
126*1c60b9acSAndroid Build Coastguard Worker 	return dlclose(p->u.l);
127*1c60b9acSAndroid Build Coastguard Worker }
128