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/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* Monkey HTTP Server
* ==================
* Copyright 2001-2017 Eduardo Silva <eduardo@monkey.io>
* Copyright (C) 2012-2013, Lauri Kasanen
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "cgi.h"
/*
* The reason for this function is that some CGI apps
*
* use LFLF and some use CRLFCRLF.
*
* If that app then sends content that has the other break
* in the beginning, monkey can accidentally send part of the
* content as headers.
*/
static char *getearliestbreak(const char buf[], const unsigned bufsize,
unsigned char * const advance)
{
char * const crend = memmem(buf, bufsize, MK_IOV_CRLFCRLF,
sizeof(MK_IOV_CRLFCRLF) - 1);
char * const lfend = memmem(buf, bufsize, MK_IOV_LFLF,
sizeof(MK_IOV_LFLF) - 1);
if (!crend && !lfend)
return NULL;
/* If only one found, return that one */
if (!crend) {
*advance = 2;
return lfend;
}
if (!lfend)
return crend;
/* Both found, return the earlier one - the latter one is part of content */
if (lfend < crend) {
*advance = 2;
return lfend;
}
return crend;
}
int process_cgi_data(struct cgi_request *r)
{
int ret;
int len;
int status;
char *buf = r->in_buf;
char *outptr = r->in_buf;
char *end;
char *endl;
unsigned char advance;
mk_api->socket_cork_flag(r->cs->socket, TCP_CORK_OFF);
if (!r->status_done && r->in_len >= 8) {
if (memcmp(buf, "Status: ", 8) == 0) {
status = atoi(buf + 8);
mk_api->header_set_http_status(r->sr, status);
endl = memchr(buf + 8, '\n', r->in_len - 8);
if (!endl) {
return MK_PLUGIN_RET_EVENT_OWNED;
}
else {
endl++;
outptr = endl;
r->in_len -= endl - buf;
}
}
else if (memcmp(buf, "HTTP", 4) == 0) {
status = atoi(buf + 9);
mk_api->header_set_http_status(r->sr, status);
endl = memchr(buf + 8, '\n', r->in_len - 8);
if (!endl) {
return MK_PLUGIN_RET_EVENT_OWNED;
}
else {
endl++;
outptr = endl;
r->in_len -= endl - buf;
}
}
mk_api->header_prepare(r->plugin, r->cs, r->sr);
r->status_done = 1;
}
if (!r->all_headers_done) {
advance = 4;
/* Write the rest of the headers without chunking */
end = getearliestbreak(outptr, r->in_len, &advance);
if (!end) {
/* Let's return until we have the headers break */
return MK_PLUGIN_RET_EVENT_OWNED;
}
end += advance;
len = end - outptr;
channel_write(r, outptr, len);
outptr += len;
r->in_len -= len;
r->all_headers_done = 1;
if (r->in_len == 0) {
return MK_PLUGIN_RET_EVENT_OWNED;
}
}
if (r->chunked) {
char tmp[16];
len = snprintf(tmp, 16, "%x\r\n", r->in_len);
ret = channel_write(r, tmp, len);
if (ret < 0)
return MK_PLUGIN_RET_EVENT_CLOSE;
}
ret = channel_write(r, outptr, r->in_len);
if (ret < 0) {
return MK_PLUGIN_RET_EVENT_CLOSE;
}
r->in_len = 0;
if (r->chunked) {
channel_write(r, MK_CRLF, 2);
}
return MK_PLUGIN_RET_EVENT_OWNED;
}
int cb_cgi_read(void *data)
{
int n;
struct cgi_request *r = data;
if (r->active == MK_FALSE) {
return -1;
}
if ((BUFLEN - r->in_len) < 1) {
PLUGIN_TRACE("CLOSE BY SIZE");
cgi_finish(r);
return -1;
}
n = read(r->fd, r->in_buf + r->in_len, BUFLEN - r->in_len);
PLUGIN_TRACE("FD=%i CGI READ=%d", r->fd, n);
if (n <= 0) {
/* It most of cases this means the child process finished */
cgi_finish(r);
return MK_PLUGIN_RET_EVENT_CLOSE;
}
r->in_len += n;
process_cgi_data(r);
return 0;
}
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