243 lines
7.4 KiB
C
243 lines
7.4 KiB
C
/***************************************************************************
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* _ _ ____ _
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* Project ___| | | | _ \| |
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* / __| | | | |_) | |
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* | (__| |_| | _ <| |___
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* \___|\___/|_| \_\_____|
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*
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* Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
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*
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* This software is licensed as described in the file COPYING, which
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* you should have received as part of this distribution. The terms
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* are also available at https://curl.se/docs/copyright.html.
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*
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* You may opt to use, copy, modify, merge, publish, distribute and/or sell
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* copies of the Software, and permit persons to whom the Software is
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* furnished to do so, under the terms of the COPYING file.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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* SPDX-License-Identifier: curl
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*
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***************************************************************************/
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#include "curl_setup.h"
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#ifndef CURL_DISABLE_GOPHER
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#include "urldata.h"
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#include <curl/curl.h>
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#include "transfer.h"
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#include "sendf.h"
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#include "cfilters.h"
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#include "connect.h"
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#include "progress.h"
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#include "gopher.h"
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#include "select.h"
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#include "strdup.h"
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#include "vtls/vtls.h"
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#include "url.h"
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#include "escape.h"
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#include "warnless.h"
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#include "curl_printf.h"
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#include "curl_memory.h"
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/* The last #include file should be: */
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#include "memdebug.h"
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/*
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* Forward declarations.
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*/
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static CURLcode gopher_do(struct Curl_easy *data, bool *done);
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#ifdef USE_SSL
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static CURLcode gopher_connect(struct Curl_easy *data, bool *done);
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static CURLcode gopher_connecting(struct Curl_easy *data, bool *done);
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#endif
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/*
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* Gopher protocol handler.
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* This is also a nice simple template to build off for simple
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* connect-command-download protocols.
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*/
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const struct Curl_handler Curl_handler_gopher = {
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"GOPHER", /* scheme */
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ZERO_NULL, /* setup_connection */
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gopher_do, /* do_it */
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ZERO_NULL, /* done */
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ZERO_NULL, /* do_more */
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ZERO_NULL, /* connect_it */
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ZERO_NULL, /* connecting */
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ZERO_NULL, /* doing */
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ZERO_NULL, /* proto_getsock */
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ZERO_NULL, /* doing_getsock */
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ZERO_NULL, /* domore_getsock */
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ZERO_NULL, /* perform_getsock */
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ZERO_NULL, /* disconnect */
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ZERO_NULL, /* readwrite */
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ZERO_NULL, /* connection_check */
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ZERO_NULL, /* attach connection */
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PORT_GOPHER, /* defport */
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CURLPROTO_GOPHER, /* protocol */
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CURLPROTO_GOPHER, /* family */
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PROTOPT_NONE /* flags */
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};
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#ifdef USE_SSL
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const struct Curl_handler Curl_handler_gophers = {
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"GOPHERS", /* scheme */
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ZERO_NULL, /* setup_connection */
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gopher_do, /* do_it */
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ZERO_NULL, /* done */
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ZERO_NULL, /* do_more */
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gopher_connect, /* connect_it */
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gopher_connecting, /* connecting */
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ZERO_NULL, /* doing */
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ZERO_NULL, /* proto_getsock */
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ZERO_NULL, /* doing_getsock */
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ZERO_NULL, /* domore_getsock */
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ZERO_NULL, /* perform_getsock */
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ZERO_NULL, /* disconnect */
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ZERO_NULL, /* readwrite */
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ZERO_NULL, /* connection_check */
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ZERO_NULL, /* attach connection */
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PORT_GOPHER, /* defport */
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CURLPROTO_GOPHERS, /* protocol */
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CURLPROTO_GOPHER, /* family */
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PROTOPT_SSL /* flags */
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};
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static CURLcode gopher_connect(struct Curl_easy *data, bool *done)
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{
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(void)data;
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(void)done;
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return CURLE_OK;
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}
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static CURLcode gopher_connecting(struct Curl_easy *data, bool *done)
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{
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struct connectdata *conn = data->conn;
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CURLcode result;
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result = Curl_conn_connect(data, FIRSTSOCKET, TRUE, done);
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if(result)
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connclose(conn, "Failed TLS connection");
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*done = TRUE;
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return result;
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}
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#endif
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static CURLcode gopher_do(struct Curl_easy *data, bool *done)
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{
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CURLcode result = CURLE_OK;
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struct connectdata *conn = data->conn;
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curl_socket_t sockfd = conn->sock[FIRSTSOCKET];
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char *gopherpath;
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char *path = data->state.up.path;
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char *query = data->state.up.query;
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char *sel = NULL;
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char *sel_org = NULL;
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timediff_t timeout_ms;
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ssize_t amount, k;
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size_t len;
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int what;
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*done = TRUE; /* unconditionally */
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/* path is guaranteed non-NULL */
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DEBUGASSERT(path);
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if(query)
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gopherpath = aprintf("%s?%s", path, query);
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else
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gopherpath = strdup(path);
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if(!gopherpath)
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return CURLE_OUT_OF_MEMORY;
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/* Create selector. Degenerate cases: / and /1 => convert to "" */
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if(strlen(gopherpath) <= 2) {
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sel = (char *)"";
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len = strlen(sel);
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free(gopherpath);
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}
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else {
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char *newp;
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/* Otherwise, drop / and the first character (i.e., item type) ... */
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newp = gopherpath;
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newp += 2;
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/* ... and finally unescape */
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result = Curl_urldecode(newp, 0, &sel, &len, REJECT_ZERO);
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free(gopherpath);
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if(result)
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return result;
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sel_org = sel;
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}
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k = curlx_uztosz(len);
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for(;;) {
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/* Break out of the loop if the selector is empty because OpenSSL and/or
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LibreSSL fail with errno 0 if this is the case. */
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if(strlen(sel) < 1)
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break;
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result = Curl_nwrite(data, FIRSTSOCKET, sel, k, &amount);
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if(!result) { /* Which may not have written it all! */
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result = Curl_client_write(data, CLIENTWRITE_HEADER, sel, amount);
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if(result)
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break;
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k -= amount;
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sel += amount;
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if(k < 1)
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break; /* but it did write it all */
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}
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else
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break;
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timeout_ms = Curl_timeleft(data, NULL, FALSE);
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if(timeout_ms < 0) {
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result = CURLE_OPERATION_TIMEDOUT;
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break;
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}
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if(!timeout_ms)
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timeout_ms = TIMEDIFF_T_MAX;
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/* Don't busyloop. The entire loop thing is a work-around as it causes a
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BLOCKING behavior which is a NO-NO. This function should rather be
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split up in a do and a doing piece where the pieces that aren't
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possible to send now will be sent in the doing function repeatedly
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until the entire request is sent.
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*/
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what = SOCKET_WRITABLE(sockfd, timeout_ms);
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if(what < 0) {
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result = CURLE_SEND_ERROR;
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break;
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}
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else if(!what) {
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result = CURLE_OPERATION_TIMEDOUT;
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break;
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}
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}
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free(sel_org);
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if(!result)
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result = Curl_nwrite(data, FIRSTSOCKET, "\r\n", 2, &amount);
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if(result) {
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failf(data, "Failed sending Gopher request");
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return result;
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}
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result = Curl_client_write(data, CLIENTWRITE_HEADER, (char *)"\r\n", 2);
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if(result)
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return result;
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Curl_setup_transfer(data, FIRSTSOCKET, -1, FALSE, -1);
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return CURLE_OK;
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}
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#endif /* CURL_DISABLE_GOPHER */
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