mirror of
https://github.com/warmcat/libwebsockets.git
synced 2025-03-16 00:00:07 +01:00
d98101d1e3
Move the common plugin scanning dir stuff to be based on lws_dir, which already builds for windows. Previously this was done via dirent for unix and libuv for windows. Reduce the dl plat stuff to just wrap instantiation and destruction of dynlibs, establish common code in lib/misc/dir.c for plugin scanning itself. Migrate the libuv windows dl stuff to windows-plugins.c, so that he's available even if later libuv loop support becomes and event lib plugin. Remove the existing api exports scheme for plugins, just export a const struct now which has a fixed header type but then whatever you want afterwards depending on the class / purpose of the plugin. Place a "class" string in the header so there can be different kinds of plugins implying different types exported. Make the plugin apis public and add support for filter by class string, and per instantation / destruction callbacks so the subclassed header type can do its thing for the plugin class. The user provides a linked-list base for his class of plugins, so he can manage them completely separately and in user code / user export types. Rip out some last hangers-on from generic sessions / tables. This is all aimed at making the plugins support general enough so it can provide event lib plugins later.
303 lines
6.8 KiB
C
303 lines
6.8 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 = write((int)(lws_intptr_t)pss->fd, buf, 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, 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, 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, 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, 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, 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: %p\n", 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, 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(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, 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 protocol_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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