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
25typedef enum {
26	LDHC_INIT_REBOOT,
27	LDHC_REBOOTING,		/* jitterwait */
28	LDHC_INIT,		/* issue DHCPDISCOVER */
29	LDHC_SELECTING,
30	LDHC_REQUESTING,
31	LDHC_REBINDING,
32	LDHC_BOUND,
33	LDHC_RENEWING
34} lws_dhcpc_state_t;
35
36enum {
37	LWSDHC4PDISCOVER		= 1,
38	LWSDHC4POFFER,
39	LWSDHC4PREQUEST,
40	LWSDHC4PDECLINE,
41	LWSDHC4PACK,
42	LWSDHC4PNACK,
43	LWSDHC4PRELEASE,
44
45	LWSDHC4POPT_PAD			= 0,
46	LWSDHC4POPT_SUBNET_MASK		= 1,
47	LWSDHC4POPT_TIME_OFFSET		= 2,
48	LWSDHC4POPT_ROUTER		= 3,
49	LWSDHC4POPT_TIME_SERVER		= 4,
50	LWSDHC4POPT_NAME_SERVER		= 5,
51	LWSDHC4POPT_DNSERVER		= 6,
52	LWSDHC4POPT_LOG_SERVER		= 7,
53	LWSDHC4POPT_COOKIE_SERVER	= 8,
54	LWSDHC4POPT_LPR_SERVER		= 9,
55	LWSDHC4POPT_IMPRESS_SERVER	= 10,
56	LWSDHC4POPT_RESLOC_SERVER	= 11,
57	LWSDHC4POPT_HOST_NAME		= 12,
58	LWSDHC4POPT_BOOTFILE_SIZE	= 13,
59	LWSDHC4POPT_MERIT_DUMP_FILE	= 14,
60	LWSDHC4POPT_DOMAIN_NAME		= 15,
61	LWSDHC4POPT_SWAP_SERVER		= 16,
62	LWSDHC4POPT_ROOT_PATH		= 17,
63	LWSDHC4POPT_EXTENSIONS_PATH	= 18,
64	LWSDHC4POPT_BROADCAST_ADS	= 28,
65
66	LWSDHC4POPT_REQUESTED_ADS	= 50,
67	LWSDHC4POPT_LEASE_TIME		= 51,
68	LWSDHC4POPT_OPTION_OVERLOAD	= 52,
69	LWSDHC4POPT_MESSAGE_TYPE		= 53,
70	LWSDHC4POPT_SERVER_ID		= 54,
71	LWSDHC4POPT_PARAM_REQ_LIST	= 55,
72	LWSDHC4POPT_MESSAGE		= 56,
73	LWSDHC4POPT_MAX_DHCP_MSG_SIZE	= 57,
74	LWSDHC4POPT_RENEWAL_TIME		= 58, /* AKA T1 */
75	LWSDHC4POPT_REBINDING_TIME	= 59, /* AKA T2 */
76	LWSDHC4POPT_VENDOR_CLASS_ID	= 60,
77	LWSDHC4POPT_CLIENT_ID		= 61,
78
79	LWSDHC4POPT_END_OPTIONS		= 255
80};
81
82typedef struct lws_dhcpc_req {
83	lws_dll2_t		list;
84
85	struct lws_context	*context;
86	lws_sorted_usec_list_t	sul_renew;
87	lws_sorted_usec_list_t 	sul_conn;
88	lws_sorted_usec_list_t 	sul_write;
89	dhcpc_cb_t		cb;	    /* cb on completion / failure */
90	void			*opaque;    /* ignored by lws, give to cb */
91
92	/* these are separated so we can close the bcast one asynchronously */
93	struct lws		*wsi_raw;   /* for broadcast */
94	lws_dhcpc_state_t	state;
95
96	lws_dhcpc_ifstate_t	is;
97
98	uint16_t		retry_count_conn;
99	uint16_t		retry_count_write;
100	uint8_t			xid[4];
101	uint8_t			af;	    /* address family */
102} lws_dhcpc_req_t;
103/* interface name is overallocated here */
104
105void
106lws_dhcpc4_retry_conn(struct lws_sorted_usec_list *sul);
107
108int
109lws_dhcpc4_parse(lws_dhcpc_req_t *r, void *in, size_t len);
110
111void
112lws_dhcpc_retry_write(struct lws_sorted_usec_list *sul);
113