/* * ws protocol handler plugin for "POST demo" * * Copyright (C) 2010-2016 Andy Green * * 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. */ #define LWS_DLL #define LWS_INTERNAL #include "../lib/libwebsockets.h" #include #include #include #include #ifdef WIN32 #include #endif #include struct per_session_data__post_demo { struct lws_spa *spa; char result[LWS_PRE + 500]; int result_len; char filename[256]; long file_length; lws_filefd_type fd; }; 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; int n; switch (state) { case LWS_UFS_OPEN: strncpy(pss->filename, filename, sizeof(pss->filename) - 1); /* 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 */ pss->fd = open("/tmp/post-file", O_CREAT | O_TRUNC | O_RDWR, 0600); 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; n = write(pss->fd, buf, len); lwsl_notice("%s: write %d says %d\n", __func__, len, n); } if (state == LWS_UFS_CONTENT) break; close(pss->fd); pss->fd = LWS_INVALID_FILE; break; } return 0; } 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 buffer[LWS_PRE + 512]; 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, 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, len)) return -1; break; case LWS_CALLBACK_HTTP_BODY_COMPLETION: lwsl_debug("LWS_CALLBACK_HTTP_BODY_COMPLETION\n"); /* call to inform no more payload data coming */ lws_spa_finalize(pss->spa); p = (unsigned char *)pss->result + LWS_PRE; end = p + sizeof(pss->result) - LWS_PRE - 1; p += sprintf((char *)p, "

Form results (after urldecoding)

" ""); for (n = 0; n < ARRAY_SIZE(param_names); n++) p += snprintf((char *)p, end - p, "", param_names[n], lws_spa_get_length(pss->spa, n), lws_spa_get_string(pss->spa, n)); p += snprintf((char *)p, end - p, "

Name	Length	Value
%s	%d	%s

filename: %s, length %ld", pss->filename, pss->file_length); p += snprintf((char *)p, end - p, ""); pss->result_len = p - (unsigned char *)(pss->result + LWS_PRE); p = buffer + LWS_PRE; start = p; end = p + sizeof(buffer) - LWS_PRE; if (lws_add_http_header_status(wsi, 200, &p, end)) return 1; if (lws_add_http_header_by_token(wsi, WSI_TOKEN_HTTP_CONTENT_TYPE, (unsigned char *)"text/html", 9, &p, end)) return 1; if (lws_add_http_header_content_length(wsi, pss->result_len, &p, end)) return 1; if (lws_finalize_http_header(wsi, &p, end)) return 1; n = lws_write(wsi, start, p - start, LWS_WRITE_HTTP_HEADERS); if (n < 0) return 1; lws_callback_on_writable(wsi); break; case LWS_CALLBACK_HTTP_WRITEABLE: lwsl_debug("LWS_CALLBACK_HTTP_WRITEABLE: sending %d\n", pss->result_len); n = lws_write(wsi, (unsigned char *)pss->result + LWS_PRE, pss->result_len, LWS_WRITE_HTTP); if (n < 0) return 1; goto try_to_reuse; 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; try_to_reuse: if (lws_http_transaction_completed(wsi)) return -1; return 0; } static const struct lws_protocols protocols[] = { { "protocol-post-demo", callback_post_demo, sizeof(struct per_session_data__post_demo), 1024, }, }; LWS_EXTERN LWS_VISIBLE int init_protocol_post_demo(struct lws_context *context, struct lws_plugin_capability *c) { if (c->api_magic != LWS_PLUGIN_API_MAGIC) { lwsl_err("Plugin API %d, library API %d", LWS_PLUGIN_API_MAGIC, c->api_magic); return 1; } c->protocols = protocols; c->count_protocols = ARRAY_SIZE(protocols); c->extensions = NULL; c->count_extensions = 0; return 0; } LWS_EXTERN LWS_VISIBLE int destroy_protocol_post_demo(struct lws_context *context) { return 0; }