1/*
2 * lws-minimal-http-server-custom-headers
3 *
4 * Written in 2010-2019 by Andy Green <andy@warmcat.com>
5 *
6 * This file is made available under the Creative Commons CC0 1.0
7 * Universal Public Domain Dedication.
8 *
9 * This demonstrates a minimal http server that can produce dynamic http
10 * content as well as static content.
11 *
12 * To keep it simple, it serves the static stuff from the subdirectory
13 * "./mount-origin" of the directory it was started in.
14 *
15 * You can change that by changing mount.origin below.
16 */
17
18#include <libwebsockets.h>
19#include <string.h>
20#include <signal.h>
21#include <time.h>
22
23static int interrupted;
24
25struct pss {
26	char result[128 + LWS_PRE];
27	int len;
28};
29
30/*
31 * This just lets us override LWS_CALLBACK_HTTP handling before passing it
32 * and everything else to the default handler.
33 */
34
35static int
36callback_http(struct lws *wsi, enum lws_callback_reasons reason,
37	      void *user, void *in, size_t len)
38{
39	uint8_t buf[LWS_PRE + 2048], *start = &buf[LWS_PRE], *p = start,
40		*end = &buf[sizeof(buf) - 1];
41	struct pss *pss = (struct pss *)user;
42	char value[32], *pr = &pss->result[LWS_PRE];
43	size_t e = sizeof(pss->result) - LWS_PRE;
44	int n;
45
46	switch (reason) {
47	case LWS_CALLBACK_HTTP:
48		/*
49		 * LWS doesn't have the "DNT" header built-in.  But we can
50		 * query it using the "custom" versions of the header apis.
51		 *
52		 * You can set your modern browser to issue DNT, look in the
53		 * privacy settings of your browser.
54		 */
55
56		pss->len = 0;
57		n = lws_hdr_custom_length(wsi, "dnt:", 4);
58		if (n < 0)
59			pss->len = lws_snprintf(pr, e,
60					"%s: DNT header not found\n", __func__);
61		else {
62
63			pss->len = lws_snprintf(pr, e,
64					"%s: DNT length %d<br>", __func__, n);
65			n = lws_hdr_custom_copy(wsi, value, sizeof(value), "dnt:", 4);
66			if (n < 0)
67				pss->len += lws_snprintf(pr + pss->len, e - (unsigned int)pss->len,
68					"%s: unable to get DNT value\n", __func__);
69			else
70
71				pss->len += lws_snprintf(pr + pss->len , e - (unsigned int)pss->len,
72					"%s: DNT value '%s'\n", __func__, value);
73		}
74
75		lwsl_user("%s\n", pr);
76
77		if (lws_add_http_common_headers(wsi, HTTP_STATUS_OK,
78				"text/html", (lws_filepos_t)pss->len, &p, end))
79			return 1;
80
81		if (lws_finalize_write_http_header(wsi, start, &p, end))
82			return 1;
83
84
85		/* write the body separately */
86		lws_callback_on_writable(wsi);
87		return 0;
88
89	case LWS_CALLBACK_HTTP_WRITEABLE:
90
91		strcpy((char *)start, "hello");
92
93		if (lws_write(wsi, (uint8_t *)pr, (unsigned int)pss->len, LWS_WRITE_HTTP_FINAL) != pss->len)
94			return 1;
95
96		if (lws_http_transaction_completed(wsi))
97			return -1;
98		return 0;
99
100	default:
101		break;
102	}
103
104	return lws_callback_http_dummy(wsi, reason, user, in, len);
105}
106
107static struct lws_protocols protocols[] = {
108	{ "http", callback_http, sizeof(struct pss), 0, 0, NULL, 0 },
109	LWS_PROTOCOL_LIST_TERM
110};
111
112static const struct lws_http_mount mount_dyn = {
113	/* .mount_next */		NULL,		/* linked-list "next" */
114	/* .mountpoint */		"/dyn",		/* mountpoint URL */
115	/* .origin */			NULL,	/* protocol */
116	/* .def */			NULL,
117	/* .protocol */			"http",
118	/* .cgienv */			NULL,
119	/* .extra_mimetypes */		NULL,
120	/* .interpret */		NULL,
121	/* .cgi_timeout */		0,
122	/* .cache_max_age */		0,
123	/* .auth_mask */		0,
124	/* .cache_reusable */		0,
125	/* .cache_revalidate */		0,
126	/* .cache_intermediaries */	0,
127	/* .origin_protocol */		LWSMPRO_CALLBACK, /* dynamic */
128	/* .mountpoint_len */		4,		/* char count */
129	/* .basic_auth_login_file */	NULL,
130};
131
132/* default mount serves the URL space from ./mount-origin */
133
134static const struct lws_http_mount mount = {
135	/* .mount_next */		&mount_dyn,		/* linked-list "next" */
136	/* .mountpoint */		"/",		/* mountpoint URL */
137	/* .origin */		"./mount-origin",	/* serve from dir */
138	/* .def */			"index.html",	/* default filename */
139	/* .protocol */			NULL,
140	/* .cgienv */			NULL,
141	/* .extra_mimetypes */		NULL,
142	/* .interpret */		NULL,
143	/* .cgi_timeout */		0,
144	/* .cache_max_age */		0,
145	/* .auth_mask */		0,
146	/* .cache_reusable */		0,
147	/* .cache_revalidate */		0,
148	/* .cache_intermediaries */	0,
149	/* .origin_protocol */		LWSMPRO_FILE,	/* files in a dir */
150	/* .mountpoint_len */		1,		/* char count */
151	/* .basic_auth_login_file */	NULL,
152};
153
154void sigint_handler(int sig)
155{
156	interrupted = 1;
157}
158
159int main(int argc, const char **argv)
160{
161	struct lws_context_creation_info info;
162	struct lws_context *context;
163	const char *p;
164	int n = 0, logs = LLL_USER | LLL_ERR | LLL_WARN | LLL_NOTICE;
165
166	signal(SIGINT, sigint_handler);
167
168	if ((p = lws_cmdline_option(argc, argv, "-d")))
169		logs = atoi(p);
170
171	lws_set_log_level(logs, NULL);
172	lwsl_user("LWS minimal http server custom headers | visit http://localhost:7681\n");
173
174	memset(&info, 0, sizeof info); /* otherwise uninitialized garbage */
175	info.options = LWS_SERVER_OPTION_DO_SSL_GLOBAL_INIT |
176		       LWS_SERVER_OPTION_EXPLICIT_VHOSTS |
177		LWS_SERVER_OPTION_HTTP_HEADERS_SECURITY_BEST_PRACTICES_ENFORCE;
178
179	/* for testing ah queue, not useful in real world */
180	if (lws_cmdline_option(argc, argv, "--ah1"))
181		info.max_http_header_pool = 1;
182
183	context = lws_create_context(&info);
184	if (!context) {
185		lwsl_err("lws init failed\n");
186		return 1;
187	}
188
189	/* http on 7681 */
190
191	info.port = 7681;
192	info.protocols = protocols;
193	info.mounts = &mount;
194	info.vhost_name = "http";
195
196	if (!lws_create_vhost(context, &info)) {
197		lwsl_err("Failed to create tls vhost\n");
198		goto bail;
199	}
200
201	/* https on 7682 */
202
203	info.port = 7682;
204	info.error_document_404 = "/404.html";
205#if defined(LWS_WITH_TLS)
206	info.ssl_cert_filepath = "localhost-100y.cert";
207	info.ssl_private_key_filepath = "localhost-100y.key";
208#endif
209	info.vhost_name = "https";
210
211	if (!lws_create_vhost(context, &info)) {
212		lwsl_err("Failed to create tls vhost\n");
213		goto bail;
214	}
215
216	while (n >= 0 && !interrupted)
217		n = lws_service(context, 0);
218
219bail:
220	lws_context_destroy(context);
221
222	return 0;
223}
224