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/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2021, Daniel Stenberg, <daniel@haxx.se>, et al.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
* are also available at https://curl.se/docs/copyright.html.
*
* You may opt to use, copy, modify, merge, publish, distribute and/or sell
* copies of the Software, and permit persons to whom the Software is
* furnished to do so, under the terms of the COPYING file.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
***************************************************************************/
#include "curl_setup.h"
#ifndef CURL_DISABLE_GOPHER
#include "urldata.h"
#include <curl/curl.h>
#include "transfer.h"
#include "sendf.h"
#include "connect.h"
#include "progress.h"
#include "gopher.h"
#include "select.h"
#include "strdup.h"
#include "vtls/vtls.h"
#include "url.h"
#include "escape.h"
#include "warnless.h"
#include "curl_printf.h"
#include "curl_memory.h"
/* The last #include file should be: */
#include "memdebug.h"
/*
* Forward declarations.
*/
static CURLcode gopher_do(struct Curl_easy *data, bool *done);
#ifdef USE_SSL
static CURLcode gopher_connect(struct Curl_easy *data, bool *done);
static CURLcode gopher_connecting(struct Curl_easy *data, bool *done);
#endif
/*
* Gopher protocol handler.
* This is also a nice simple template to build off for simple
* connect-command-download protocols.
*/
const struct Curl_handler Curl_handler_gopher = {
"GOPHER", /* scheme */
ZERO_NULL, /* setup_connection */
gopher_do, /* do_it */
ZERO_NULL, /* done */
ZERO_NULL, /* do_more */
ZERO_NULL, /* connect_it */
ZERO_NULL, /* connecting */
ZERO_NULL, /* doing */
ZERO_NULL, /* proto_getsock */
ZERO_NULL, /* doing_getsock */
ZERO_NULL, /* domore_getsock */
ZERO_NULL, /* perform_getsock */
ZERO_NULL, /* disconnect */
ZERO_NULL, /* readwrite */
ZERO_NULL, /* connection_check */
ZERO_NULL, /* attach connection */
PORT_GOPHER, /* defport */
CURLPROTO_GOPHER, /* protocol */
CURLPROTO_GOPHER, /* family */
PROTOPT_NONE /* flags */
};
#ifdef USE_SSL
const struct Curl_handler Curl_handler_gophers = {
"GOPHERS", /* scheme */
ZERO_NULL, /* setup_connection */
gopher_do, /* do_it */
ZERO_NULL, /* done */
ZERO_NULL, /* do_more */
gopher_connect, /* connect_it */
gopher_connecting, /* connecting */
ZERO_NULL, /* doing */
ZERO_NULL, /* proto_getsock */
ZERO_NULL, /* doing_getsock */
ZERO_NULL, /* domore_getsock */
ZERO_NULL, /* perform_getsock */
ZERO_NULL, /* disconnect */
ZERO_NULL, /* readwrite */
ZERO_NULL, /* connection_check */
ZERO_NULL, /* attach connection */
PORT_GOPHER, /* defport */
CURLPROTO_GOPHERS, /* protocol */
CURLPROTO_GOPHER, /* family */
PROTOPT_SSL /* flags */
};
static CURLcode gopher_connect(struct Curl_easy *data, bool *done)
{
(void)data;
(void)done;
return CURLE_OK;
}
static CURLcode gopher_connecting(struct Curl_easy *data, bool *done)
{
struct connectdata *conn = data->conn;
CURLcode result = Curl_ssl_connect(data, conn, FIRSTSOCKET);
if(result)
connclose(conn, "Failed TLS connection");
*done = TRUE;
return result;
}
#endif
static CURLcode gopher_do(struct Curl_easy *data, bool *done)
{
CURLcode result = CURLE_OK;
struct connectdata *conn = data->conn;
curl_socket_t sockfd = conn->sock[FIRSTSOCKET];
char *gopherpath;
char *path = data->state.up.path;
char *query = data->state.up.query;
char *sel = NULL;
char *sel_org = NULL;
timediff_t timeout_ms;
ssize_t amount, k;
size_t len;
int what;
*done = TRUE; /* unconditionally */
/* path is guaranteed non-NULL */
DEBUGASSERT(path);
if(query)
gopherpath = aprintf("%s?%s", path, query);
else
gopherpath = strdup(path);
if(!gopherpath)
return CURLE_OUT_OF_MEMORY;
/* Create selector. Degenerate cases: / and /1 => convert to "" */
if(strlen(gopherpath) <= 2) {
sel = (char *)"";
len = strlen(sel);
free(gopherpath);
}
else {
char *newp;
/* Otherwise, drop / and the first character (i.e., item type) ... */
newp = gopherpath;
newp += 2;
/* ... and finally unescape */
result = Curl_urldecode(data, newp, 0, &sel, &len, REJECT_ZERO);
free(gopherpath);
if(result)
return result;
sel_org = sel;
}
k = curlx_uztosz(len);
for(;;) {
/* Break out of the loop if the selector is empty because OpenSSL and/or
LibreSSL fail with errno 0 if this is the case. */
if(strlen(sel) < 1)
break;
result = Curl_write(data, sockfd, sel, k, &amount);
if(!result) { /* Which may not have written it all! */
result = Curl_client_write(data, CLIENTWRITE_HEADER, sel, amount);
if(result)
break;
k -= amount;
sel += amount;
if(k < 1)
break; /* but it did write it all */
}
else
break;
timeout_ms = Curl_timeleft(data, NULL, FALSE);
if(timeout_ms < 0) {
result = CURLE_OPERATION_TIMEDOUT;
break;
}
if(!timeout_ms)
timeout_ms = TIMEDIFF_T_MAX;
/* Don't busyloop. The entire loop thing is a work-around as it causes a
BLOCKING behavior which is a NO-NO. This function should rather be
split up in a do and a doing piece where the pieces that aren't
possible to send now will be sent in the doing function repeatedly
until the entire request is sent.
*/
what = SOCKET_WRITABLE(sockfd, timeout_ms);
if(what < 0) {
result = CURLE_SEND_ERROR;
break;
}
else if(!what) {
result = CURLE_OPERATION_TIMEDOUT;
break;
}
}
free(sel_org);
if(!result)
result = Curl_write(data, sockfd, "\r\n", 2, &amount);
if(result) {
failf(data, "Failed sending Gopher request");
return result;
}
result = Curl_client_write(data, CLIENTWRITE_HEADER, (char *)"\r\n", 2);
if(result)
return result;
Curl_setup_transfer(data, FIRSTSOCKET, -1, FALSE, -1);
return CURLE_OK;
}
#endif /*CURL_DISABLE_GOPHER*/
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