1/*
2 * lws-minimal-http-server-form-get
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 performs a form GET with a couple
10 * of parameters.  It dumps the parameters to the console log and redirects
11 * to another page.
12 */
13
14#include <libwebsockets.h>
15#include <string.h>
16#include <signal.h>
17
18static int interrupted;
19
20static const char * param_names[] = {
21	"text1",
22	"send"
23};
24
25static int
26callback_http(struct lws *wsi, enum lws_callback_reasons reason, void *user,
27	      void *in, size_t len)
28{
29	uint8_t buf[LWS_PRE + LWS_RECOMMENDED_MIN_HEADER_SPACE],
30		*start = &buf[LWS_PRE], *p = start,
31		*end = &buf[sizeof(buf) - 1];
32	int n;
33
34	switch (reason) {
35	case LWS_CALLBACK_HTTP:
36
37		if (!lws_hdr_total_length(wsi, WSI_TOKEN_GET_URI))
38			/* not a GET */
39			break;
40		lwsl_err("%s: %s\n", __func__, (const char *)in);
41		if (strcmp((const char *)in, "/form1"))
42			/* not our form URL */
43			break;
44
45		/* we just dump the decoded things to the log */
46
47		for (n = 0; n < (int)LWS_ARRAY_SIZE(param_names); n++) {
48			int rv = lws_get_urlarg_by_name_safe(wsi, param_names[n],
49					(char *)buf, sizeof(buf));
50			if (rv < 0)
51				lwsl_user("%s: undefined\n", param_names[n]);
52			else
53				lwsl_user("%s: (len %d) '%s'\n", param_names[n],
54					  (int)rv, buf);
55		}
56
57		/*
58		 * Our response is to redirect to a static page.  We could
59		 * have generated a dynamic html page here instead.
60		 */
61
62		if (lws_http_redirect(wsi, HTTP_STATUS_MOVED_PERMANENTLY,
63				      (unsigned char *)"after-form1.html",
64				      16, &p, end) < 0)
65			return -1;
66		break;
67
68	default:
69		break;
70	}
71
72	return lws_callback_http_dummy(wsi, reason, user, in, len);
73}
74
75static struct lws_protocols protocols[] = {
76	{ "http", callback_http, 0, 0, 0, NULL, 0 },
77	LWS_PROTOCOL_LIST_TERM
78};
79
80/* default mount serves the URL space from ./mount-origin */
81
82static const struct lws_http_mount mount = {
83	/* .mount_next */	       NULL,		/* linked-list "next" */
84	/* .mountpoint */		"/",		/* mountpoint URL */
85	/* .origin */		"./mount-origin",	/* serve from dir */
86	/* .def */			"index.html",	/* default filename */
87	/* .protocol */			NULL,
88	/* .cgienv */			NULL,
89	/* .extra_mimetypes */		NULL,
90	/* .interpret */		NULL,
91	/* .cgi_timeout */		0,
92	/* .cache_max_age */		0,
93	/* .auth_mask */		0,
94	/* .cache_reusable */		0,
95	/* .cache_revalidate */		0,
96	/* .cache_intermediaries */	0,
97	/* .origin_protocol */		LWSMPRO_FILE,	/* files in a dir */
98	/* .mountpoint_len */		1,		/* char count */
99	/* .basic_auth_login_file */	NULL,
100};
101
102void sigint_handler(int sig)
103{
104	interrupted = 1;
105}
106
107int main(int argc, const char **argv)
108{
109	struct lws_context_creation_info info;
110	struct lws_context *context;
111	const char *p;
112	int n = 0, logs = LLL_USER | LLL_ERR | LLL_WARN | LLL_NOTICE
113			/* for LLL_ verbosity above NOTICE to be built into lws,
114			 * lws must have been configured and built with
115			 * -DCMAKE_BUILD_TYPE=DEBUG instead of =RELEASE */
116			/* | LLL_INFO */ /* | LLL_PARSER */ /* | LLL_HEADER */
117			/* | LLL_EXT */ /* | LLL_CLIENT */ /* | LLL_LATENCY */
118			/* | LLL_DEBUG */;
119
120	signal(SIGINT, sigint_handler);
121
122	if ((p = lws_cmdline_option(argc, argv, "-d")))
123		logs = atoi(p);
124
125	lws_set_log_level(logs, NULL);
126	lwsl_user("LWS minimal http server GET | visit http://localhost:7681\n");
127
128	memset(&info, 0, sizeof info); /* otherwise uninitialized garbage */
129	info.port = 7681;
130	info.protocols = protocols;
131	info.mounts = &mount;
132	info.options =
133		LWS_SERVER_OPTION_HTTP_HEADERS_SECURITY_BEST_PRACTICES_ENFORCE;
134
135	context = lws_create_context(&info);
136	if (!context) {
137		lwsl_err("lws init failed\n");
138		return 1;
139	}
140
141	while (n >= 0 && !interrupted)
142		n = lws_service(context, 0);
143
144	lws_context_destroy(context);
145
146	return 0;
147}
148