• Home
  • Line#
  • Scopes#
  • Navigate#
  • Raw
  • Download
1  /*
2  * libwebsockets - small server side websockets and web server implementation
3  *
4  * Copyright (C) 2010 - 2021 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 #include "private-lib-core.h"
26 #include "private-lib-system-dhcpclient.h"
27 
28 void
lws_dhcpc_retry_write(struct lws_sorted_usec_list * sul)29 lws_dhcpc_retry_write(struct lws_sorted_usec_list *sul)
30 {
31 	lws_dhcpc_req_t *r = lws_container_of(sul, lws_dhcpc_req_t, sul_write);
32 
33 	lwsl_debug("%s\n", __func__);
34 
35 	if (r && r->wsi_raw)
36 		lws_callback_on_writable(r->wsi_raw);
37 }
38 
39 static void
lws_dhcpc_destroy(lws_dhcpc_req_t ** pr)40 lws_dhcpc_destroy(lws_dhcpc_req_t **pr)
41 {
42 	lws_dhcpc_req_t *r = *pr;
43 
44 	lws_sul_cancel(&r->sul_conn);
45 	lws_sul_cancel(&r->sul_write);
46 	lws_sul_cancel(&r->sul_renew);
47 
48 	if (r->wsi_raw)
49 		lws_set_timeout(r->wsi_raw, 1, LWS_TO_KILL_ASYNC);
50 
51 	lws_dll2_remove(&r->list);
52 
53 	lws_free_set_NULL(r);
54 }
55 
56 int
lws_dhcpc_status(struct lws_context * context,lws_sockaddr46 * sa46)57 lws_dhcpc_status(struct lws_context *context, lws_sockaddr46 *sa46)
58 {
59 	lws_dhcpc_req_t *r;
60 
61 	lws_start_foreach_dll(struct lws_dll2 *, p, context->dhcpc_owner.head) {
62 		r = (lws_dhcpc_req_t *)p;
63 
64 		if (r->state == LDHC_BOUND) {
65 			if (sa46) {
66 				memcpy(sa46, &r->is.sa46[LWSDH_SA46_DNS_SRV_1],
67 				       sizeof(*sa46));
68 			}
69 			return 1;
70 		}
71 
72 	} lws_end_foreach_dll(p);
73 
74 	return 0;
75 }
76 
77 static lws_dhcpc_req_t *
lws_dhcpc_find(struct lws_context * context,const char * iface,int af)78 lws_dhcpc_find(struct lws_context *context, const char *iface, int af)
79 {
80 	lws_dhcpc_req_t *r;
81 
82 	/* see if we are already looking after this af / iface combination */
83 
84 	lws_start_foreach_dll(struct lws_dll2 *, p, context->dhcpc_owner.head) {
85 		r = (lws_dhcpc_req_t *)p;
86 
87 		if (!strcmp((const char *)&r[1], iface) && af == r->af)
88 			return r; /* yes...  */
89 
90 	} lws_end_foreach_dll(p);
91 
92 	return NULL;
93 }
94 
95 /*
96  * Create a persistent dhcp client entry for network interface "iface" and AF
97  * type "af"
98  */
99 
100 int
lws_dhcpc_request(struct lws_context * context,const char * iface,int af,dhcpc_cb_t cb,void * opaque)101 lws_dhcpc_request(struct lws_context *context, const char *iface, int af,
102 		  dhcpc_cb_t cb, void *opaque)
103 {
104 	lws_dhcpc_req_t *r = lws_dhcpc_find(context, iface, af);
105 	int n;
106 
107 	/* see if we are already looking after this af / iface combination */
108 
109 	if (r)
110 		return 0;
111 
112 	/* nope... let's create a request object as he asks */
113 
114 	n = (int)strlen(iface);
115 	r = lws_zalloc(sizeof(*r) + (unsigned int)n + 1u, __func__);
116 	if (!r)
117 		return 1;
118 
119 	memcpy(&r[1], iface, (unsigned int)n + 1);
120 	r->af = (uint8_t)af;
121 	r->cb = cb;
122 	r->opaque = opaque;
123 	r->context = context;
124 	r->state = LDHC_INIT;
125 
126 	lws_strncpy(r->is.ifname, iface, sizeof(r->is.ifname));
127 
128 	lws_dll2_add_head(&r->list, &context->dhcpc_owner); /* add him to list */
129 
130 	lws_dhcpc4_retry_conn(&r->sul_conn);
131 
132 	return 0;
133 }
134 
135 /*
136  * Destroy every DHCP client object related to interface "iface"
137  */
138 
139 static int
_remove_if(struct lws_dll2 * d,void * opaque)140 _remove_if(struct lws_dll2 *d, void *opaque)
141 {
142 	lws_dhcpc_req_t *r = lws_container_of(d, lws_dhcpc_req_t, list);
143 
144 	if (!opaque || !strcmp((const char *)&r[1], (const char *)opaque))
145 		lws_dhcpc_destroy(&r);
146 
147 	return 0;
148 }
149 
150 int
lws_dhcpc_remove(struct lws_context * context,const char * iface)151 lws_dhcpc_remove(struct lws_context *context, const char *iface)
152 {
153 	lws_dll2_foreach_safe(&context->dhcpc_owner, (void *)iface, _remove_if);
154 
155 	return 0;
156 }
157