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/* Copyright 2015 greenbytes GmbH (https://www.greenbytes.de)
*
* 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 <assert.h>
#include <stdio.h>
#include <apr_strings.h>
#include <httpd.h>
#include <http_core.h>
#include <http_log.h>
#include <nghttp2/nghttp2.h>
#include "h2_private.h"
#include "h2_util.h"
#include "h2_response.h"
static h2_ngheader *make_ngheader(apr_pool_t *pool, const char *status,
apr_table_t *header);
static int ignore_header(const char *name)
{
return (H2_HD_MATCH_LIT_CS("connection", name)
|| H2_HD_MATCH_LIT_CS("proxy-connection", name)
|| H2_HD_MATCH_LIT_CS("upgrade", name)
|| H2_HD_MATCH_LIT_CS("keep-alive", name)
|| H2_HD_MATCH_LIT_CS("transfer-encoding", name));
}
h2_response *h2_response_create(int stream_id,
const char *http_status,
apr_array_header_t *hlines,
apr_pool_t *pool)
{
apr_table_t *header;
h2_response *response = apr_pcalloc(pool, sizeof(h2_response));
int i;
if (response == NULL) {
return NULL;
}
response->stream_id = stream_id;
response->status = http_status;
response->content_length = -1;
if (hlines) {
header = apr_table_make(pool, hlines->nelts);
for (i = 0; i < hlines->nelts; ++i) {
char *hline = ((char **)hlines->elts)[i];
char *sep = ap_strchr(hline, ':');
if (!sep) {
ap_log_perror(APLOG_MARK, APLOG_WARNING, APR_EINVAL, pool,
APLOGNO(02955) "h2_response(%d): invalid header[%d] '%s'",
response->stream_id, i, (char*)hline);
/* not valid format, abort */
return NULL;
}
(*sep++) = '\0';
while (*sep == ' ' || *sep == '\t') {
++sep;
}
if (ignore_header(hline)) {
/* never forward, ch. 8.1.2.2 */
}
else {
apr_table_merge(header, hline, sep);
if (*sep && H2_HD_MATCH_LIT_CS("content-length", hline)) {
char *end;
response->content_length = apr_strtoi64(sep, &end, 10);
if (sep == end) {
ap_log_perror(APLOG_MARK, APLOG_WARNING, APR_EINVAL,
pool, APLOGNO(02956)
"h2_response(%d): content-length"
" value not parsed: %s",
response->stream_id, sep);
response->content_length = -1;
}
}
}
}
}
else {
header = apr_table_make(pool, 0);
}
response->rheader = header;
return response;
}
h2_response *h2_response_rcreate(int stream_id, request_rec *r,
apr_table_t *header, apr_pool_t *pool)
{
h2_response *response = apr_pcalloc(pool, sizeof(h2_response));
if (response == NULL) {
return NULL;
}
response->stream_id = stream_id;
response->status = apr_psprintf(pool, "%d", r->status);
response->content_length = -1;
response->rheader = header;
return response;
}
void h2_response_destroy(h2_response *response)
{
(void)response;
}
h2_response *h2_response_copy(apr_pool_t *pool, h2_response *from)
{
h2_response *to = apr_pcalloc(pool, sizeof(h2_response));
to->stream_id = from->stream_id;
to->status = apr_pstrdup(pool, from->status);
to->content_length = from->content_length;
if (from->rheader) {
to->ngheader = make_ngheader(pool, to->status, from->rheader);
}
return to;
}
typedef struct {
nghttp2_nv *nv;
size_t nvlen;
size_t nvstrlen;
size_t offset;
char *strbuf;
apr_pool_t *pool;
} nvctx_t;
static int count_header(void *ctx, const char *key, const char *value)
{
if (!ignore_header(key)) {
nvctx_t *nvctx = (nvctx_t*)ctx;
nvctx->nvlen++;
nvctx->nvstrlen += strlen(key) + strlen(value) + 2;
}
return 1;
}
#define NV_ADD_LIT_CS(nv, k, v) addnv_lit_cs(nv, k, sizeof(k) - 1, v, strlen(v))
#define NV_ADD_CS_CS(nv, k, v) addnv_cs_cs(nv, k, strlen(k), v, strlen(v))
#define NV_BUF_ADD(nv, s, len) memcpy(nv->strbuf, s, len); \
s = nv->strbuf; \
nv->strbuf += len + 1
static void addnv_cs_cs(nvctx_t *ctx, const char *key, size_t key_len,
const char *value, size_t val_len)
{
nghttp2_nv *nv = &ctx->nv[ctx->offset];
NV_BUF_ADD(ctx, key, key_len);
NV_BUF_ADD(ctx, value, val_len);
nv->name = (uint8_t*)key;
nv->namelen = key_len;
nv->value = (uint8_t*)value;
nv->valuelen = val_len;
ctx->offset++;
}
static void addnv_lit_cs(nvctx_t *ctx, const char *key, size_t key_len,
const char *value, size_t val_len)
{
nghttp2_nv *nv = &ctx->nv[ctx->offset];
NV_BUF_ADD(ctx, value, val_len);
nv->name = (uint8_t*)key;
nv->namelen = key_len;
nv->value = (uint8_t*)value;
nv->valuelen = val_len;
ctx->offset++;
}
static int add_header(void *ctx, const char *key, const char *value)
{
if (!ignore_header(key)) {
nvctx_t *nvctx = (nvctx_t*)ctx;
NV_ADD_CS_CS(nvctx, key, value);
}
return 1;
}
static h2_ngheader *make_ngheader(apr_pool_t *pool, const char *status,
apr_table_t *header)
{
size_t n;
h2_ngheader *h;
nvctx_t ctx;
ctx.nv = NULL;
ctx.nvlen = 1;
ctx.nvstrlen = strlen(status) + 1;
ctx.offset = 0;
ctx.strbuf = NULL;
ctx.pool = pool;
apr_table_do(count_header, &ctx, header, NULL);
n = (sizeof(h2_ngheader)
+ (ctx.nvlen * sizeof(nghttp2_nv)) + ctx.nvstrlen);
h = apr_pcalloc(pool, n);
if (h) {
ctx.nv = (nghttp2_nv*)(h + 1);
ctx.strbuf = (char*)&ctx.nv[ctx.nvlen];
NV_ADD_LIT_CS(&ctx, ":status", status);
apr_table_do(add_header, &ctx, header, NULL);
h->nv = ctx.nv;
h->nvlen = ctx.nvlen;
}
return h;
}
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