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