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/*
* Copyright (c) 2019, Salvatore Sanfilippo <antirez at gmail dot com>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of Redis nor the names of its contributors may be used
* to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include "server.h"
/* Emit an item in Gopher directory listing format:
* <type><descr><TAB><selector><TAB><hostname><TAB><port>
* If descr or selector are NULL, then the "(NULL)" string is used instead. */
void addReplyGopherItem(client *c, const char *type, const char *descr,
const char *selector, const char *hostname, int port)
{
sds item = sdscatfmt(sdsempty(),"%s%s\t%s\t%s\t%i\r\n",
type, descr,
selector ? selector : "(NULL)",
hostname ? hostname : "(NULL)",
port);
addReplyProto(c,item,sdslen(item));
sdsfree(item);
}
/* This is called by processInputBuffer() when an inline request is processed
* with Gopher mode enabled, and the request happens to have zero or just one
* argument. In such case we get the relevant key and reply using the Gopher
* protocol. */
void processGopherRequest(client *c) {
robj *keyname = c->argc == 0 ? createStringObject("/",1) : c->argv[0];
robj *o = lookupKeyRead(c->db,keyname,NULL);
/* If there is no such key, return with a Gopher error. */
if (o == NULL || o->type != OBJ_STRING) {
char *errstr;
if (o == NULL)
errstr = "Error: no content at the specified key";
else
errstr = "Error: selected key type is invalid "
"for Gopher output";
addReplyGopherItem(c,"i",errstr,NULL,NULL,0);
addReplyGopherItem(c,"i","Redis Gopher server",NULL,NULL,0);
} else {
addReply(c,o);
}
/* Cleanup, also make sure to emit the final ".CRLF" line. Note that
* the connection will be closed immediately after this because the client
* will be flagged with CLIENT_CLOSE_AFTER_REPLY, in accordance with the
* Gopher protocol. */
if (c->argc == 0) decrRefCount(keyname);
/* Note that in theory we should terminate the Gopher request with
* ".<CR><LF>" (called Lastline in the RFC) like that:
*
* addReplyProto(c,".\r\n",3);
*
* However after examining the current clients landscape, it's probably
* going to do more harm than good for several reasons:
*
* 1. Clients should not have any issue with missing .<CR><LF> as for
* specification, and in the real world indeed certain servers
* implementations never used to send the terminator.
*
* 2. Redis does not know if it's serving a text file or a binary file:
* at the same time clients will not remove the ".<CR><LF>" bytes at
* tne end when downloading a binary file from the server, so adding
* the "Lastline" terminator without knowing the content is just
* dangerous.
*
* 3. The utility gopher2redis.rb that we provide for Redis, and any
* other similar tool you may use as Gopher authoring system for
* Redis, can just add the "Lastline" when needed.
*/
}
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