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/*
* ws protocol handler plugin for "POST demo"
*
* Written in 2010-2019 by Andy Green <andy@warmcat.com>
*
* This file is made available under the Creative Commons CC0 1.0
* Universal Public Domain Dedication.
*
* The person who associated a work with this deed has dedicated
* the work to the public domain by waiving all of his or her rights
* to the work worldwide under copyright law, including all related
* and neighboring rights, to the extent allowed by law. You can copy,
* modify, distribute and perform the work, even for commercial purposes,
* all without asking permission.
*
* These test plugins are intended to be adapted for use in your code, which
* may be proprietary. So unlike the library itself, they are licensed
* Public Domain.
*/
#if !defined (LWS_PLUGIN_STATIC)
#if !defined(LWS_DLL)
#define LWS_DLL
#endif
#if !defined(LWS_INTERNAL)
#define LWS_INTERNAL
#endif
#include <libwebsockets.h>
#endif
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>
#ifdef WIN32
#include <io.h>
#endif
#include <stdio.h>
struct per_session_data__post_demo {
struct lws_spa *spa;
char result[LWS_PRE + LWS_RECOMMENDED_MIN_HEADER_SPACE];
char filename[64];
long file_length;
#if !defined(LWS_WITH_ESP32)
lws_filefd_type fd;
#endif
uint8_t completed:1;
uint8_t sent_headers:1;
uint8_t sent_body:1;
};
static const char * const param_names[] = {
"text",
"send",
"file",
"upload",
};
enum enum_param_names {
EPN_TEXT,
EPN_SEND,
EPN_FILE,
EPN_UPLOAD,
};
static int
file_upload_cb(void *data, const char *name, const char *filename,
char *buf, int len, enum lws_spa_fileupload_states state)
{
struct per_session_data__post_demo *pss =
(struct per_session_data__post_demo *)data;
#if !defined(LWS_WITH_ESP32)
int n;
(void)n;
#endif
switch (state) {
case LWS_UFS_OPEN:
lws_strncpy(pss->filename, filename, sizeof(pss->filename));
/* we get the original filename in @filename arg, but for
* simple demo use a fixed name so we don't have to deal with
* attacks */
#if !defined(LWS_WITH_ESP32)
pss->fd = (lws_filefd_type)(lws_intptr_t)lws_open("/tmp/post-file",
O_CREAT | O_TRUNC | O_RDWR, 0600);
#endif
break;
case LWS_UFS_FINAL_CONTENT:
case LWS_UFS_CONTENT:
if (len) {
pss->file_length += len;
/* if the file length is too big, drop it */
if (pss->file_length > 100000)
return 1;
#if !defined(LWS_WITH_ESP32)
n = (int)write((int)(lws_intptr_t)pss->fd, buf, (unsigned int)len);
lwsl_info("%s: write %d says %d\n", __func__, len, n);
#else
lwsl_notice("%s: Received chunk size %d\n", __func__, len);
#endif
}
if (state == LWS_UFS_CONTENT)
break;
#if !defined(LWS_WITH_ESP32)
close((int)(lws_intptr_t)pss->fd);
pss->fd = LWS_INVALID_FILE;
#endif
break;
case LWS_UFS_CLOSE:
break;
}
return 0;
}
/*
* returns length in bytes
*/
static int
format_result(struct per_session_data__post_demo *pss)
{
unsigned char *p, *start, *end;
int n;
p = (unsigned char *)pss->result + LWS_PRE;
start = p;
end = p + sizeof(pss->result) - LWS_PRE - 1;
if (!pss->spa) {
p += lws_snprintf((char *)p, lws_ptr_diff_size_t(end, p),
"pss->spa already NULL");
goto bail;
}
p += lws_snprintf((char *)p, lws_ptr_diff_size_t(end, p),
"<!DOCTYPE html><html lang=\"en\"><head>"
"<meta charset=utf-8 http-equiv=\"Content-Language\" "
"content=\"en\"/>"
"<title>LWS Server Status</title>"
"</head><body><h1>Form results (after urldecoding)</h1>"
"<table><tr><td>Name</td><td>Length</td><td>Value</td></tr>");
for (n = 0; n < (int)LWS_ARRAY_SIZE(param_names); n++) {
if (!lws_spa_get_string(pss->spa, n))
p += lws_snprintf((char *)p, lws_ptr_diff_size_t(end, p),
"<tr><td><b>%s</b></td><td>0"
"</td><td>NULL</td></tr>",
param_names[n]);
else
p += lws_snprintf((char *)p, lws_ptr_diff_size_t(end, p),
"<tr><td><b>%s</b></td><td>%d"
"</td><td>%s</td></tr>",
param_names[n],
lws_spa_get_length(pss->spa, n),
lws_spa_get_string(pss->spa, n));
}
p += lws_snprintf((char *)p, lws_ptr_diff_size_t(end, p),
"</table><br><b>filename:</b> %s, "
"<b>length</b> %ld",
pss->filename, pss->file_length);
p += lws_snprintf((char *)p, lws_ptr_diff_size_t(end, p), "</body></html>");
bail:
return (int)lws_ptr_diff(p, start);
}
static int
callback_post_demo(struct lws *wsi, enum lws_callback_reasons reason,
void *user, void *in, size_t len)
{
struct per_session_data__post_demo *pss =
(struct per_session_data__post_demo *)user;
unsigned char *p, *start, *end;
int n;
switch (reason) {
case LWS_CALLBACK_HTTP_BODY:
/* create the POST argument parser if not already existing */
if (!pss->spa) {
pss->spa = lws_spa_create(wsi, param_names,
LWS_ARRAY_SIZE(param_names), 1024,
file_upload_cb, pss);
if (!pss->spa)
return -1;
pss->filename[0] = '\0';
pss->file_length = 0;
}
/* let it parse the POST data */
if (lws_spa_process(pss->spa, in, (int)len))
return -1;
break;
case LWS_CALLBACK_HTTP_BODY_COMPLETION:
lwsl_debug("LWS_CALLBACK_HTTP_BODY_COMPLETION: %s\n", lws_wsi_tag(wsi));
/* call to inform no more payload data coming */
lws_spa_finalize(pss->spa);
pss->completed = 1;
lws_callback_on_writable(wsi);
break;
case LWS_CALLBACK_HTTP_WRITEABLE:
if (!pss->completed)
break;
p = (unsigned char *)pss->result + LWS_PRE;
start = p;
end = p + sizeof(pss->result) - LWS_PRE - 1;
if (!pss->sent_headers) {
n = format_result(pss);
if (lws_add_http_header_status(wsi, HTTP_STATUS_OK,
&p, end))
goto bail;
if (lws_add_http_header_by_token(wsi,
WSI_TOKEN_HTTP_CONTENT_TYPE,
(unsigned char *)"text/html", 9,
&p, end))
goto bail;
if (lws_add_http_header_content_length(wsi, (unsigned int)n, &p, end))
goto bail;
if (lws_finalize_http_header(wsi, &p, end))
goto bail;
/* first send the headers ... */
n = lws_write(wsi, start, lws_ptr_diff_size_t(p, start),
LWS_WRITE_HTTP_HEADERS);
if (n < 0)
goto bail;
pss->sent_headers = 1;
lws_callback_on_writable(wsi);
break;
}
if (!pss->sent_body) {
n = format_result(pss);
n = lws_write(wsi, (unsigned char *)start, (unsigned int)n,
LWS_WRITE_HTTP_FINAL);
pss->sent_body = 1;
if (n < 0)
return 1;
goto try_to_reuse;
}
break;
case LWS_CALLBACK_HTTP_DROP_PROTOCOL:
/* called when our wsi user_space is going to be destroyed */
if (pss->spa) {
lws_spa_destroy(pss->spa);
pss->spa = NULL;
}
break;
default:
break;
}
return 0;
bail:
return 1;
try_to_reuse:
if (lws_http_transaction_completed(wsi))
return -1;
return 0;
}
#define LWS_PLUGIN_PROTOCOL_POST_DEMO \
{ \
"protocol-post-demo", \
callback_post_demo, \
sizeof(struct per_session_data__post_demo), \
1024, \
0, NULL, 0 \
}
#if !defined (LWS_PLUGIN_STATIC)
LWS_VISIBLE const struct lws_protocols post_demo_protocols[] = {
LWS_PLUGIN_PROTOCOL_POST_DEMO
};
LWS_VISIBLE const lws_plugin_protocol_t post_demo = {
.hdr = {
"post demo",
"lws_protocol_plugin",
LWS_BUILD_HASH,
LWS_PLUGIN_API_MAGIC
},
.protocols = post_demo_protocols,
.count_protocols = LWS_ARRAY_SIZE(post_demo_protocols),
.extensions = NULL,
.count_extensions = 0,
};
#endif
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