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+/***************************************************************************
+ * _ _ ____ _
+ * Project ___| | | | _ \| |
+ * / __| | | | |_) | |
+ * | (__| |_| | _ <| |___
+ * \___|\___/|_| \_\_____|
+ *
+ * Copyright (C) 1998 - 2012, 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 http://curl.haxx.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 "setup.h"
+
+#ifndef CURL_DISABLE_GOPHER
+
+#include "urldata.h"
+#include <curl/curl.h>
+#include "transfer.h"
+#include "sendf.h"
+
+#include "progress.h"
+#include "strequal.h"
+#include "gopher.h"
+#include "rawstr.h"
+#include "select.h"
+#include "url.h"
+#include "warnless.h"
+
+#define _MPRINTF_REPLACE /* use our functions only */
+#include <curl/mprintf.h>
+
+#include "curl_memory.h"
+/* The last #include file should be: */
+#include "memdebug.h"
+
+/*
+ * Forward declarations.
+ */
+
+static CURLcode gopher_do(struct connectdata *conn, bool *done);
+
+/*
+ * 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 */
+ PORT_GOPHER, /* defport */
+ CURLPROTO_GOPHER, /* protocol */
+ PROTOPT_NONE /* flags */
+};
+
+static CURLcode gopher_do(struct connectdata *conn, bool *done)
+{
+ CURLcode result=CURLE_OK;
+ struct SessionHandle *data=conn->data;
+ curl_socket_t sockfd = conn->sock[FIRSTSOCKET];
+
+ curl_off_t *bytecount = &data->req.bytecount;
+ char *path = data->state.path;
+ char *sel;
+ char *sel_org = NULL;
+ ssize_t amount, k;
+
+ *done = TRUE; /* unconditionally */
+
+ /* Create selector. Degenerate cases: / and /1 => convert to "" */
+ if(strlen(path) <= 2)
+ sel = (char *)"";
+ else {
+ char *newp;
+ size_t j, i;
+ int len;
+
+ /* Otherwise, drop / and the first character (i.e., item type) ... */
+ newp = path;
+ newp+=2;
+
+ /* ... then turn ? into TAB for search servers, Veronica, etc. ... */
+ j = strlen(newp);
+ for(i=0; i<j; i++)
+ if(newp[i] == '?')
+ newp[i] = '\x09';
+
+ /* ... and finally unescape */
+ sel = curl_easy_unescape(data, newp, 0, &len);
+ if(!sel)
+ return CURLE_OUT_OF_MEMORY;
+ sel_org = sel;
+ }
+
+ /* We use Curl_write instead of Curl_sendf to make sure the entire buffer is
+ sent, which could be sizeable with long selectors. */
+ k = curlx_uztosz(strlen(sel));
+
+ for(;;) {
+ result = Curl_write(conn, sockfd, sel, k, &amount);
+ if(CURLE_OK == result) { /* Which may not have written it all! */
+ result = Curl_client_write(conn, CLIENTWRITE_HEADER, sel, amount);
+ if(result) {
+ Curl_safefree(sel_org);
+ return result;
+ }
+ k -= amount;
+ sel += amount;
+ if(k < 1)
+ break; /* but it did write it all */
+ }
+ else {
+ failf(data, "Failed sending Gopher request");
+ Curl_safefree(sel_org);
+ return result;
+ }
+ /* 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.
+
+ Wait a while for the socket to be writable. Note that this doesn't
+ acknowledge the timeout.
+ */
+ Curl_socket_ready(CURL_SOCKET_BAD, sockfd, 100);
+ }
+
+ Curl_safefree(sel_org);
+
+ /* We can use Curl_sendf to send the terminal \r\n relatively safely and
+ save allocing another string/doing another _write loop. */
+ result = Curl_sendf(sockfd, conn, "\r\n");
+ if(result != CURLE_OK) {
+ failf(data, "Failed sending Gopher request");
+ return result;
+ }
+ result = Curl_client_write(conn, CLIENTWRITE_HEADER, (char *)"\r\n", 2);
+ if(result)
+ return result;
+
+ Curl_setup_transfer(conn, FIRSTSOCKET, -1, FALSE, bytecount,
+ -1, NULL); /* no upload */
+ return CURLE_OK;
+}
+#endif /*CURL_DISABLE_GOPHER*/