mirror of
https://github.com/warmcat/libwebsockets.git
synced 2025-03-16 00:00:07 +01:00
c9731c5f17
This is a huge patch that should be a global NOP. For unix type platforms it enables -Wconversion to issue warnings (-> error) for all automatic casts that seem less than ideal but are normally concealed by the toolchain. This is things like passing an int to a size_t argument. Once enabled, I went through all args on my default build (which build most things) and tried to make the removed default cast explicit. With that approach it neither change nor bloat the code, since it compiles to whatever it was doing before, just with the casts made explicit... in a few cases I changed some length args from int to size_t but largely left the causes alone. From now on, new code that is relying on less than ideal casting will complain and nudge me to improve it by warnings.
303 lines
7 KiB
C
303 lines
7 KiB
C
/*
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* ws protocol handler plugin for "POST demo"
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*
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* Written in 2010-2019 by Andy Green <andy@warmcat.com>
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*
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* This file is made available under the Creative Commons CC0 1.0
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* Universal Public Domain Dedication.
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*
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* The person who associated a work with this deed has dedicated
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* the work to the public domain by waiving all of his or her rights
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* to the work worldwide under copyright law, including all related
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* and neighboring rights, to the extent allowed by law. You can copy,
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* modify, distribute and perform the work, even for commercial purposes,
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* all without asking permission.
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*
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* These test plugins are intended to be adapted for use in your code, which
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* may be proprietary. So unlike the library itself, they are licensed
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* Public Domain.
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*/
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#if !defined (LWS_PLUGIN_STATIC)
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#define LWS_DLL
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#define LWS_INTERNAL
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#include <libwebsockets.h>
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#endif
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#include <stdlib.h>
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#include <string.h>
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#include <fcntl.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#ifdef WIN32
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#include <io.h>
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#endif
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#include <stdio.h>
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struct per_session_data__post_demo {
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struct lws_spa *spa;
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char result[LWS_PRE + LWS_RECOMMENDED_MIN_HEADER_SPACE];
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char filename[64];
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long file_length;
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#if !defined(LWS_WITH_ESP32)
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lws_filefd_type fd;
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#endif
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uint8_t completed:1;
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uint8_t sent_headers:1;
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uint8_t sent_body:1;
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};
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static const char * const param_names[] = {
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"text",
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"send",
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"file",
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"upload",
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};
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enum enum_param_names {
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EPN_TEXT,
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EPN_SEND,
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EPN_FILE,
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EPN_UPLOAD,
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};
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static int
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file_upload_cb(void *data, const char *name, const char *filename,
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char *buf, int len, enum lws_spa_fileupload_states state)
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{
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struct per_session_data__post_demo *pss =
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(struct per_session_data__post_demo *)data;
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#if !defined(LWS_WITH_ESP32)
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int n;
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(void)n;
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#endif
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switch (state) {
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case LWS_UFS_OPEN:
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lws_strncpy(pss->filename, filename, sizeof(pss->filename));
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/* we get the original filename in @filename arg, but for
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* simple demo use a fixed name so we don't have to deal with
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* attacks */
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#if !defined(LWS_WITH_ESP32)
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pss->fd = (lws_filefd_type)(lws_intptr_t)lws_open("/tmp/post-file",
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O_CREAT | O_TRUNC | O_RDWR, 0600);
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#endif
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break;
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case LWS_UFS_FINAL_CONTENT:
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case LWS_UFS_CONTENT:
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if (len) {
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pss->file_length += len;
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/* if the file length is too big, drop it */
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if (pss->file_length > 100000)
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return 1;
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#if !defined(LWS_WITH_ESP32)
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n = (int)write((int)(lws_intptr_t)pss->fd, buf, (unsigned int)len);
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lwsl_info("%s: write %d says %d\n", __func__, len, n);
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#else
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lwsl_notice("%s: Received chunk size %d\n", __func__, len);
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#endif
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}
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if (state == LWS_UFS_CONTENT)
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break;
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#if !defined(LWS_WITH_ESP32)
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close((int)(lws_intptr_t)pss->fd);
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pss->fd = LWS_INVALID_FILE;
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#endif
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break;
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case LWS_UFS_CLOSE:
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break;
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}
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return 0;
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}
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/*
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* returns length in bytes
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*/
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static int
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format_result(struct per_session_data__post_demo *pss)
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{
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unsigned char *p, *start, *end;
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int n;
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p = (unsigned char *)pss->result + LWS_PRE;
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start = p;
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end = p + sizeof(pss->result) - LWS_PRE - 1;
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p += lws_snprintf((char *)p, lws_ptr_diff_size_t(end, p),
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"<!DOCTYPE html><html lang=\"en\"><head>"
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"<meta charset=utf-8 http-equiv=\"Content-Language\" "
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"content=\"en\"/>"
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"<title>LWS Server Status</title>"
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"</head><body><h1>Form results (after urldecoding)</h1>"
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"<table><tr><td>Name</td><td>Length</td><td>Value</td></tr>");
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for (n = 0; n < (int)LWS_ARRAY_SIZE(param_names); n++) {
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if (!lws_spa_get_string(pss->spa, n))
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p += lws_snprintf((char *)p, lws_ptr_diff_size_t(end, p),
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"<tr><td><b>%s</b></td><td>0"
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"</td><td>NULL</td></tr>",
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param_names[n]);
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else
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p += lws_snprintf((char *)p, lws_ptr_diff_size_t(end, p),
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"<tr><td><b>%s</b></td><td>%d"
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"</td><td>%s</td></tr>",
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param_names[n],
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lws_spa_get_length(pss->spa, n),
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lws_spa_get_string(pss->spa, n));
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}
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p += lws_snprintf((char *)p, lws_ptr_diff_size_t(end, p),
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"</table><br><b>filename:</b> %s, "
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"<b>length</b> %ld",
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pss->filename, pss->file_length);
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p += lws_snprintf((char *)p, lws_ptr_diff_size_t(end, p), "</body></html>");
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return (int)lws_ptr_diff(p, start);
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}
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static int
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callback_post_demo(struct lws *wsi, enum lws_callback_reasons reason,
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void *user, void *in, size_t len)
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{
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struct per_session_data__post_demo *pss =
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(struct per_session_data__post_demo *)user;
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unsigned char *p, *start, *end;
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int n;
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switch (reason) {
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case LWS_CALLBACK_HTTP_BODY:
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/* create the POST argument parser if not already existing */
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if (!pss->spa) {
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pss->spa = lws_spa_create(wsi, param_names,
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LWS_ARRAY_SIZE(param_names), 1024,
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file_upload_cb, pss);
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if (!pss->spa)
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return -1;
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pss->filename[0] = '\0';
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pss->file_length = 0;
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}
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/* let it parse the POST data */
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if (lws_spa_process(pss->spa, in, (int)len))
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return -1;
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break;
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case LWS_CALLBACK_HTTP_BODY_COMPLETION:
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lwsl_debug("LWS_CALLBACK_HTTP_BODY_COMPLETION: %s\n", lws_wsi_tag(wsi));
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/* call to inform no more payload data coming */
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lws_spa_finalize(pss->spa);
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pss->completed = 1;
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lws_callback_on_writable(wsi);
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break;
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case LWS_CALLBACK_HTTP_WRITEABLE:
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if (!pss->completed)
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break;
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p = (unsigned char *)pss->result + LWS_PRE;
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start = p;
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end = p + sizeof(pss->result) - LWS_PRE - 1;
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if (!pss->sent_headers) {
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n = format_result(pss);
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if (lws_add_http_header_status(wsi, HTTP_STATUS_OK,
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&p, end))
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goto bail;
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if (lws_add_http_header_by_token(wsi,
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WSI_TOKEN_HTTP_CONTENT_TYPE,
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(unsigned char *)"text/html", 9,
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&p, end))
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goto bail;
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if (lws_add_http_header_content_length(wsi, (unsigned int)n, &p, end))
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goto bail;
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if (lws_finalize_http_header(wsi, &p, end))
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goto bail;
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/* first send the headers ... */
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n = lws_write(wsi, start, lws_ptr_diff_size_t(p, start),
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LWS_WRITE_HTTP_HEADERS);
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if (n < 0)
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goto bail;
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pss->sent_headers = 1;
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lws_callback_on_writable(wsi);
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break;
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}
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if (!pss->sent_body) {
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n = format_result(pss);
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n = lws_write(wsi, (unsigned char *)start, (unsigned int)n,
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LWS_WRITE_HTTP_FINAL);
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pss->sent_body = 1;
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if (n < 0)
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return 1;
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goto try_to_reuse;
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}
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break;
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case LWS_CALLBACK_HTTP_DROP_PROTOCOL:
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/* called when our wsi user_space is going to be destroyed */
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if (pss->spa) {
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lws_spa_destroy(pss->spa);
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pss->spa = NULL;
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}
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break;
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default:
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break;
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}
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return 0;
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bail:
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return 1;
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try_to_reuse:
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if (lws_http_transaction_completed(wsi))
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return -1;
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return 0;
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}
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#define LWS_PLUGIN_PROTOCOL_POST_DEMO \
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{ \
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"protocol-post-demo", \
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callback_post_demo, \
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sizeof(struct per_session_data__post_demo), \
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1024, \
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0, NULL, 0 \
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}
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#if !defined (LWS_PLUGIN_STATIC)
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static const struct lws_protocols protocols[] = {
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LWS_PLUGIN_PROTOCOL_POST_DEMO
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};
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LWS_VISIBLE const lws_plugin_protocol_t post_demo = {
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.hdr = {
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"post demo",
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"lws_protocol_plugin",
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LWS_PLUGIN_API_MAGIC
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},
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.protocols = protocols,
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.count_protocols = LWS_ARRAY_SIZE(protocols),
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.extensions = NULL,
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.count_extensions = 0,
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};
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#endif
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