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-rw-r--r--modules/http2/h2_c1_io.c545
1 files changed, 545 insertions, 0 deletions
diff --git a/modules/http2/h2_c1_io.c b/modules/http2/h2_c1_io.c
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--- /dev/null
+++ b/modules/http2/h2_c1_io.c
@@ -0,0 +1,545 @@
+/* Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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 <apr_strings.h>
+#include <ap_mpm.h>
+#include <mpm_common.h>
+
+#include <httpd.h>
+#include <http_core.h>
+#include <http_log.h>
+#include <http_connection.h>
+#include <http_protocol.h>
+#include <http_request.h>
+#include <http_ssl.h>
+
+#include "h2_private.h"
+#include "h2_bucket_eos.h"
+#include "h2_config.h"
+#include "h2_c1.h"
+#include "h2_c1_io.h"
+#include "h2_protocol.h"
+#include "h2_session.h"
+#include "h2_util.h"
+
+#define TLS_DATA_MAX (16*1024)
+
+/* Calculated like this: assuming MTU 1500 bytes
+ * 1500 - 40 (IP) - 20 (TCP) - 40 (TCP options)
+ * - TLS overhead (60-100)
+ * ~= 1300 bytes */
+#define WRITE_SIZE_INITIAL 1300
+
+/* The maximum we'd like to write in one chunk is
+ * the max size of a TLS record. When pushing
+ * many frames down the h2 connection, this might
+ * align differently because of headers and other
+ * frames or simply as not sufficient data is
+ * in a response body.
+ * However keeping frames at or below this limit
+ * should make optimizations at the layer that writes
+ * to TLS easier.
+ */
+#define WRITE_SIZE_MAX (TLS_DATA_MAX)
+
+#define BUF_REMAIN ((apr_size_t)(bmax-off))
+
+static void h2_c1_io_bb_log(conn_rec *c, int stream_id, int level,
+ const char *tag, apr_bucket_brigade *bb)
+{
+ char buffer[16 * 1024];
+ const char *line = "(null)";
+ int bmax = sizeof(buffer)/sizeof(buffer[0]);
+ int off = 0;
+ apr_bucket *b;
+
+ (void)stream_id;
+ if (bb) {
+ memset(buffer, 0, bmax--);
+ for (b = APR_BRIGADE_FIRST(bb);
+ bmax && (b != APR_BRIGADE_SENTINEL(bb));
+ b = APR_BUCKET_NEXT(b)) {
+
+ if (APR_BUCKET_IS_METADATA(b)) {
+ if (APR_BUCKET_IS_EOS(b)) {
+ off += apr_snprintf(buffer+off, BUF_REMAIN, "eos ");
+ }
+ else if (APR_BUCKET_IS_FLUSH(b)) {
+ off += apr_snprintf(buffer+off, BUF_REMAIN, "flush ");
+ }
+ else if (AP_BUCKET_IS_EOR(b)) {
+ off += apr_snprintf(buffer+off, BUF_REMAIN, "eor ");
+ }
+ else if (H2_BUCKET_IS_H2EOS(b)) {
+ off += apr_snprintf(buffer+off, BUF_REMAIN, "h2eos ");
+ }
+ else {
+ off += apr_snprintf(buffer+off, BUF_REMAIN, "meta(unknown) ");
+ }
+ }
+ else {
+ const char *btype = "data";
+ if (APR_BUCKET_IS_FILE(b)) {
+ btype = "file";
+ }
+ else if (APR_BUCKET_IS_PIPE(b)) {
+ btype = "pipe";
+ }
+ else if (APR_BUCKET_IS_SOCKET(b)) {
+ btype = "socket";
+ }
+ else if (APR_BUCKET_IS_HEAP(b)) {
+ btype = "heap";
+ }
+ else if (APR_BUCKET_IS_TRANSIENT(b)) {
+ btype = "transient";
+ }
+ else if (APR_BUCKET_IS_IMMORTAL(b)) {
+ btype = "immortal";
+ }
+#if APR_HAS_MMAP
+ else if (APR_BUCKET_IS_MMAP(b)) {
+ btype = "mmap";
+ }
+#endif
+ else if (APR_BUCKET_IS_POOL(b)) {
+ btype = "pool";
+ }
+
+ off += apr_snprintf(buffer+off, BUF_REMAIN, "%s[%ld] ",
+ btype,
+ (long)(b->length == ((apr_size_t)-1)? -1UL : b->length));
+ }
+ }
+ line = *buffer? buffer : "(empty)";
+ }
+ /* Intentional no APLOGNO */
+ ap_log_cerror(APLOG_MARK, level, 0, c, "h2_session(%ld)-%s: %s",
+ c->id, tag, line);
+
+}
+#define C1_IO_BB_LOG(c, stream_id, level, tag, bb) \
+ if (APLOG_C_IS_LEVEL(c, level)) { \
+ h2_c1_io_bb_log((c), (stream_id), (level), (tag), (bb)); \
+ }
+
+
+apr_status_t h2_c1_io_init(h2_c1_io *io, h2_session *session)
+{
+ conn_rec *c = session->c1;
+
+ io->session = session;
+ io->output = apr_brigade_create(c->pool, c->bucket_alloc);
+ io->is_tls = ap_ssl_conn_is_ssl(session->c1);
+ io->buffer_output = io->is_tls;
+ io->flush_threshold = 4 * (apr_size_t)h2_config_sgeti64(session->s, H2_CONF_STREAM_MAX_MEM);
+
+ if (io->buffer_output) {
+ /* This is what we start with,
+ * see https://issues.apache.org/jira/browse/TS-2503
+ */
+ io->warmup_size = h2_config_sgeti64(session->s, H2_CONF_TLS_WARMUP_SIZE);
+ io->cooldown_usecs = (h2_config_sgeti(session->s, H2_CONF_TLS_COOLDOWN_SECS)
+ * APR_USEC_PER_SEC);
+ io->cooldown_usecs = 0;
+ io->write_size = (io->cooldown_usecs > 0?
+ WRITE_SIZE_INITIAL : WRITE_SIZE_MAX);
+ }
+ else {
+ io->warmup_size = 0;
+ io->cooldown_usecs = 0;
+ io->write_size = 0;
+ }
+
+ if (APLOGctrace1(c)) {
+ ap_log_cerror(APLOG_MARK, APLOG_TRACE4, 0, c,
+ "h2_c1_io(%ld): init, buffering=%d, warmup_size=%ld, "
+ "cd_secs=%f", c->id, io->buffer_output,
+ (long)io->warmup_size,
+ ((double)io->cooldown_usecs/APR_USEC_PER_SEC));
+ }
+
+ return APR_SUCCESS;
+}
+
+static void append_scratch(h2_c1_io *io)
+{
+ if (io->scratch && io->slen > 0) {
+ apr_bucket *b = apr_bucket_heap_create(io->scratch, io->slen,
+ apr_bucket_free,
+ io->session->c1->bucket_alloc);
+ APR_BRIGADE_INSERT_TAIL(io->output, b);
+ io->buffered_len += io->slen;
+ io->scratch = NULL;
+ io->slen = io->ssize = 0;
+ }
+}
+
+static apr_size_t assure_scratch_space(h2_c1_io *io) {
+ apr_size_t remain = io->ssize - io->slen;
+ if (io->scratch && remain == 0) {
+ append_scratch(io);
+ }
+ if (!io->scratch) {
+ /* we control the size and it is larger than what buckets usually
+ * allocate. */
+ io->scratch = apr_bucket_alloc(io->write_size, io->session->c1->bucket_alloc);
+ io->ssize = io->write_size;
+ io->slen = 0;
+ remain = io->ssize;
+ }
+ return remain;
+}
+
+static apr_status_t read_to_scratch(h2_c1_io *io, apr_bucket *b)
+{
+ apr_status_t status;
+ const char *data;
+ apr_size_t len;
+
+ if (!b->length) {
+ return APR_SUCCESS;
+ }
+
+ ap_assert(b->length <= (io->ssize - io->slen));
+ if (APR_BUCKET_IS_FILE(b)) {
+ apr_bucket_file *f = (apr_bucket_file *)b->data;
+ apr_file_t *fd = f->fd;
+ apr_off_t offset = b->start;
+
+ len = b->length;
+ /* file buckets will read 8000 byte chunks and split
+ * themselves. However, we do know *exactly* how many
+ * bytes we need where. So we read the file directly to
+ * where we need it.
+ */
+ status = apr_file_seek(fd, APR_SET, &offset);
+ if (status != APR_SUCCESS) {
+ return status;
+ }
+ status = apr_file_read(fd, io->scratch + io->slen, &len);
+ if (status != APR_SUCCESS && status != APR_EOF) {
+ return status;
+ }
+ io->slen += len;
+ }
+ else if (APR_BUCKET_IS_MMAP(b)) {
+ ap_log_cerror(APLOG_MARK, APLOG_INFO, 0, io->session->c1,
+ "h2_c1_io(%ld): seeing mmap bucket of size %ld, scratch remain=%ld",
+ io->session->c1->id, (long)b->length, (long)(io->ssize - io->slen));
+ status = apr_bucket_read(b, &data, &len, APR_BLOCK_READ);
+ if (status == APR_SUCCESS) {
+ memcpy(io->scratch+io->slen, data, len);
+ io->slen += len;
+ }
+ }
+ else {
+ status = apr_bucket_read(b, &data, &len, APR_BLOCK_READ);
+ if (status == APR_SUCCESS) {
+ memcpy(io->scratch+io->slen, data, len);
+ io->slen += len;
+ }
+ }
+ return status;
+}
+
+static apr_status_t pass_output(h2_c1_io *io, int flush)
+{
+ conn_rec *c = io->session->c1;
+ apr_off_t bblen;
+ apr_status_t rv;
+
+ append_scratch(io);
+ if (flush) {
+ if (!APR_BUCKET_IS_FLUSH(APR_BRIGADE_LAST(io->output))) {
+ apr_bucket *b = apr_bucket_flush_create(c->bucket_alloc);
+ APR_BRIGADE_INSERT_TAIL(io->output, b);
+ }
+ }
+ if (APR_BRIGADE_EMPTY(io->output)) {
+ return APR_SUCCESS;
+ }
+
+ io->unflushed = !APR_BUCKET_IS_FLUSH(APR_BRIGADE_LAST(io->output));
+ apr_brigade_length(io->output, 0, &bblen);
+ C1_IO_BB_LOG(c, 0, APLOG_TRACE2, "out", io->output);
+
+ rv = ap_pass_brigade(c->output_filters, io->output);
+ if (APR_SUCCESS != rv) goto cleanup;
+
+ io->buffered_len = 0;
+ io->bytes_written += (apr_size_t)bblen;
+
+ if (io->write_size < WRITE_SIZE_MAX
+ && io->bytes_written >= io->warmup_size) {
+ /* connection is hot, use max size */
+ io->write_size = WRITE_SIZE_MAX;
+ }
+ else if (io->cooldown_usecs > 0
+ && io->write_size > WRITE_SIZE_INITIAL) {
+ apr_time_t now = apr_time_now();
+ if ((now - io->last_write) >= io->cooldown_usecs) {
+ /* long time not written, reset write size */
+ io->write_size = WRITE_SIZE_INITIAL;
+ io->bytes_written = 0;
+ }
+ else {
+ io->last_write = now;
+ }
+ }
+
+cleanup:
+ if (APR_SUCCESS != rv) {
+ ap_log_cerror(APLOG_MARK, APLOG_DEBUG, rv, c, APLOGNO(03044)
+ "h2_c1_io(%ld): pass_out brigade %ld bytes",
+ c->id, (long)bblen);
+ }
+ apr_brigade_cleanup(io->output);
+ return rv;
+}
+
+int h2_c1_io_needs_flush(h2_c1_io *io)
+{
+ return io->buffered_len >= io->flush_threshold;
+}
+
+int h2_c1_io_pending(h2_c1_io *io)
+{
+ return !APR_BRIGADE_EMPTY(io->output) || (io->scratch && io->slen > 0);
+}
+
+apr_status_t h2_c1_io_pass(h2_c1_io *io)
+{
+ apr_status_t rv = APR_SUCCESS;
+
+ if (h2_c1_io_pending(io)) {
+ rv = pass_output(io, 0);
+ }
+ return rv;
+}
+
+apr_status_t h2_c1_io_assure_flushed(h2_c1_io *io)
+{
+ apr_status_t rv = APR_SUCCESS;
+
+ if (h2_c1_io_pending(io) || io->unflushed) {
+ rv = pass_output(io, 1);
+ if (APR_SUCCESS != rv) goto cleanup;
+ }
+cleanup:
+ return rv;
+}
+
+apr_status_t h2_c1_io_add_data(h2_c1_io *io, const char *data, size_t length)
+{
+ apr_status_t status = APR_SUCCESS;
+ apr_size_t remain;
+
+ ap_log_cerror(APLOG_MARK, APLOG_TRACE2, 0, io->session->c1,
+ "h2_c1_io(%ld): adding %ld data bytes",
+ io->session->c1->id, (long)length);
+ if (io->buffer_output) {
+ while (length > 0) {
+ remain = assure_scratch_space(io);
+ if (remain >= length) {
+ memcpy(io->scratch + io->slen, data, length);
+ io->slen += length;
+ length = 0;
+ }
+ else {
+ memcpy(io->scratch + io->slen, data, remain);
+ io->slen += remain;
+ data += remain;
+ length -= remain;
+ }
+ }
+ }
+ else {
+ status = apr_brigade_write(io->output, NULL, NULL, data, length);
+ io->buffered_len += length;
+ }
+ return status;
+}
+
+apr_status_t h2_c1_io_append(h2_c1_io *io, apr_bucket_brigade *bb)
+{
+ apr_bucket *b;
+ apr_status_t rv = APR_SUCCESS;
+
+ while (!APR_BRIGADE_EMPTY(bb)) {
+ b = APR_BRIGADE_FIRST(bb);
+ if (APR_BUCKET_IS_METADATA(b) || APR_BUCKET_IS_MMAP(b)) {
+ /* need to finish any open scratch bucket, as meta data
+ * needs to be forward "in order". */
+ append_scratch(io);
+ APR_BUCKET_REMOVE(b);
+ APR_BRIGADE_INSERT_TAIL(io->output, b);
+ }
+ else if (io->buffer_output) {
+ apr_size_t remain = assure_scratch_space(io);
+ if (b->length > remain) {
+ apr_bucket_split(b, remain);
+ if (io->slen == 0) {
+ /* complete write_size bucket, append unchanged */
+ APR_BUCKET_REMOVE(b);
+ APR_BRIGADE_INSERT_TAIL(io->output, b);
+ io->buffered_len += b->length;
+ continue;
+ }
+ }
+ else {
+ /* bucket fits in remain, copy to scratch */
+ rv = read_to_scratch(io, b);
+ apr_bucket_delete(b);
+ if (APR_SUCCESS != rv) goto cleanup;
+ continue;
+ }
+ }
+ else {
+ /* no buffering, forward buckets setaside on flush */
+ apr_bucket_setaside(b, io->session->c1->pool);
+ APR_BUCKET_REMOVE(b);
+ APR_BRIGADE_INSERT_TAIL(io->output, b);
+ io->buffered_len += b->length;
+ }
+ }
+cleanup:
+ return rv;
+}
+
+static apr_status_t c1_in_feed_bucket(h2_session *session,
+ apr_bucket *b, apr_ssize_t *inout_len)
+{
+ apr_status_t rv = APR_SUCCESS;
+ apr_size_t len;
+ const char *data;
+ ssize_t n;
+
+ rv = apr_bucket_read(b, &data, &len, APR_BLOCK_READ);
+ while (APR_SUCCESS == rv && len > 0) {
+ n = nghttp2_session_mem_recv(session->ngh2, (const uint8_t *)data, len);
+
+ ap_log_cerror(APLOG_MARK, APLOG_TRACE4, 0, session->c1,
+ H2_SSSN_MSG(session, "fed %ld bytes to nghttp2, %ld read"),
+ (long)len, (long)n);
+ if (n < 0) {
+ if (nghttp2_is_fatal((int)n)) {
+ h2_session_event(session, H2_SESSION_EV_PROTO_ERROR,
+ (int)n, nghttp2_strerror((int)n));
+ rv = APR_EGENERAL;
+ }
+ }
+ else {
+ *inout_len += n;
+ if ((apr_ssize_t)len <= n) {
+ break;
+ }
+ len -= (apr_size_t)n;
+ data += n;
+ }
+ }
+
+ return rv;
+}
+
+static apr_status_t c1_in_feed_brigade(h2_session *session,
+ apr_bucket_brigade *bb,
+ apr_ssize_t *inout_len)
+{
+ apr_status_t rv = APR_SUCCESS;
+ apr_bucket* b;
+
+ *inout_len = 0;
+ while (!APR_BRIGADE_EMPTY(bb)) {
+ b = APR_BRIGADE_FIRST(bb);
+ if (!APR_BUCKET_IS_METADATA(b)) {
+ rv = c1_in_feed_bucket(session, b, inout_len);
+ if (APR_SUCCESS != rv) goto cleanup;
+ }
+ apr_bucket_delete(b);
+ }
+cleanup:
+ apr_brigade_cleanup(bb);
+ return rv;
+}
+
+static apr_status_t read_and_feed(h2_session *session)
+{
+ apr_ssize_t bytes_fed, bytes_requested;
+ apr_status_t rv;
+
+ bytes_requested = H2MAX(APR_BUCKET_BUFF_SIZE, session->max_stream_mem * 4);
+ rv = ap_get_brigade(session->c1->input_filters,
+ session->bbtmp, AP_MODE_READBYTES,
+ APR_NONBLOCK_READ, bytes_requested);
+
+ if (APR_SUCCESS == rv) {
+ if (!APR_BRIGADE_EMPTY(session->bbtmp)) {
+ h2_util_bb_log(session->c1, session->id, APLOG_TRACE2, "c1 in",
+ session->bbtmp);
+ rv = c1_in_feed_brigade(session, session->bbtmp, &bytes_fed);
+ session->io.bytes_read += bytes_fed;
+ }
+ else {
+ rv = APR_EAGAIN;
+ }
+ }
+ return rv;
+}
+
+apr_status_t h2_c1_read(h2_session *session)
+{
+ apr_status_t rv;
+
+ /* H2_IN filter handles all incoming data against the session.
+ * We just pull at the filter chain to make it happen */
+ ap_log_cerror(APLOG_MARK, APLOG_TRACE2, 0, session->c1,
+ H2_SSSN_MSG(session, "session_read start"));
+ rv = read_and_feed(session);
+
+ if (APR_SUCCESS == rv) {
+ h2_session_dispatch_event(session, H2_SESSION_EV_INPUT_PENDING, 0, NULL);
+ }
+ else if (APR_STATUS_IS_EAGAIN(rv)) {
+ /* Signal that we have exhausted the input momentarily.
+ * This might switch to polling the socket */
+ h2_session_dispatch_event(session, H2_SESSION_EV_INPUT_EXHAUSTED, 0, NULL);
+ }
+ else if (APR_SUCCESS != rv) {
+ if (APR_STATUS_IS_ETIMEDOUT(rv)
+ || APR_STATUS_IS_ECONNABORTED(rv)
+ || APR_STATUS_IS_ECONNRESET(rv)
+ || APR_STATUS_IS_EOF(rv)
+ || APR_STATUS_IS_EBADF(rv)) {
+ /* common status for a client that has left */
+ ap_log_cerror(APLOG_MARK, APLOG_TRACE2, rv, session->c1,
+ H2_SSSN_MSG(session, "input gone"));
+ }
+ else {
+ /* uncommon status, log on INFO so that we see this */
+ ap_log_cerror( APLOG_MARK, APLOG_DEBUG, rv, session->c1,
+ H2_SSSN_LOG(APLOGNO(02950), session,
+ "error reading, terminating"));
+ }
+ h2_session_dispatch_event(session, H2_SESSION_EV_CONN_ERROR, 0, NULL);
+ }
+
+ apr_brigade_cleanup(session->bbtmp);
+ ap_log_cerror(APLOG_MARK, APLOG_TRACE2, rv, session->c1,
+ H2_SSSN_MSG(session, "session_read done"));
+ return rv;
+}
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