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
18 static int interrupted;
19
20 static const char * param_names[] = {
21 "text1",
22 "send"
23 };
24
25 static int
callback_http(struct lws * wsi,enum lws_callback_reasons reason,void * user,void * in,size_t len)26 callback_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
75 static 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
82 static 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
sigint_handler(int sig)102 void sigint_handler(int sig)
103 {
104 interrupted = 1;
105 }
106
main(int argc,const char ** argv)107 int 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