Reviewed by: delphij (suggested MFC) Approved by: roberto Security: CVE-2015-1798, CVE-2015-1799 Security: VuXML ebd84c96-dd7e-11e4-854e-3c970e169bc2 MFC after: 1 month
3440 lines
80 KiB
C
3440 lines
80 KiB
C
/*
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* Copyright (c) 2002-2007 Niels Provos <provos@citi.umich.edu>
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* Copyright (c) 2007-2012 Niels Provos and Nick Mathewson
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "event2/event-config.h"
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#include "evconfig-private.h"
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#ifdef _WIN32
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#include <winsock2.h>
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#include <windows.h>
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#include <io.h>
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#endif
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#ifdef EVENT__HAVE_VASPRINTF
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/* If we have vasprintf, we need to define _GNU_SOURCE before we include
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* stdio.h. This comes from evconfig-private.h.
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*/
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#endif
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#include <sys/types.h>
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#ifdef EVENT__HAVE_SYS_TIME_H
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#include <sys/time.h>
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#endif
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#ifdef EVENT__HAVE_SYS_SOCKET_H
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#include <sys/socket.h>
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#endif
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#ifdef EVENT__HAVE_SYS_UIO_H
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#include <sys/uio.h>
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#endif
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#ifdef EVENT__HAVE_SYS_IOCTL_H
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#include <sys/ioctl.h>
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#endif
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#ifdef EVENT__HAVE_SYS_MMAN_H
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#include <sys/mman.h>
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#endif
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#ifdef EVENT__HAVE_SYS_SENDFILE_H
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#include <sys/sendfile.h>
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#endif
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#ifdef EVENT__HAVE_SYS_STAT_H
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#include <sys/stat.h>
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#endif
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#ifdef EVENT__HAVE_STDARG_H
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#include <stdarg.h>
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#endif
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#ifdef EVENT__HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#include <limits.h>
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#include "event2/event.h"
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#include "event2/buffer.h"
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#include "event2/buffer_compat.h"
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#include "event2/bufferevent.h"
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#include "event2/bufferevent_compat.h"
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#include "event2/bufferevent_struct.h"
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#include "event2/thread.h"
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#include "log-internal.h"
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#include "mm-internal.h"
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#include "util-internal.h"
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#include "evthread-internal.h"
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#include "evbuffer-internal.h"
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#include "bufferevent-internal.h"
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/* some systems do not have MAP_FAILED */
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#ifndef MAP_FAILED
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#define MAP_FAILED ((void *)-1)
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#endif
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/* send file support */
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#if defined(EVENT__HAVE_SYS_SENDFILE_H) && defined(EVENT__HAVE_SENDFILE) && defined(__linux__)
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#define USE_SENDFILE 1
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#define SENDFILE_IS_LINUX 1
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#elif defined(EVENT__HAVE_SENDFILE) && defined(__FreeBSD__)
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#define USE_SENDFILE 1
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#define SENDFILE_IS_FREEBSD 1
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#elif defined(EVENT__HAVE_SENDFILE) && defined(__APPLE__)
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#define USE_SENDFILE 1
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#define SENDFILE_IS_MACOSX 1
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#elif defined(EVENT__HAVE_SENDFILE) && defined(__sun__) && defined(__svr4__)
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#define USE_SENDFILE 1
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#define SENDFILE_IS_SOLARIS 1
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#endif
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/* Mask of user-selectable callback flags. */
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#define EVBUFFER_CB_USER_FLAGS 0xffff
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/* Mask of all internal-use-only flags. */
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#define EVBUFFER_CB_INTERNAL_FLAGS 0xffff0000
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/* Flag set if the callback is using the cb_obsolete function pointer */
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#define EVBUFFER_CB_OBSOLETE 0x00040000
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/* evbuffer_chain support */
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#define CHAIN_SPACE_PTR(ch) ((ch)->buffer + (ch)->misalign + (ch)->off)
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#define CHAIN_SPACE_LEN(ch) ((ch)->flags & EVBUFFER_IMMUTABLE ? \
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0 : (ch)->buffer_len - ((ch)->misalign + (ch)->off))
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#define CHAIN_PINNED(ch) (((ch)->flags & EVBUFFER_MEM_PINNED_ANY) != 0)
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#define CHAIN_PINNED_R(ch) (((ch)->flags & EVBUFFER_MEM_PINNED_R) != 0)
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/* evbuffer_ptr support */
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#define PTR_NOT_FOUND(ptr) do { \
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(ptr)->pos = -1; \
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(ptr)->internal_.chain = NULL; \
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(ptr)->internal_.pos_in_chain = 0; \
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} while (0)
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static void evbuffer_chain_align(struct evbuffer_chain *chain);
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static int evbuffer_chain_should_realign(struct evbuffer_chain *chain,
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size_t datalen);
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static void evbuffer_deferred_callback(struct event_callback *cb, void *arg);
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static int evbuffer_ptr_memcmp(const struct evbuffer *buf,
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const struct evbuffer_ptr *pos, const char *mem, size_t len);
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static struct evbuffer_chain *evbuffer_expand_singlechain(struct evbuffer *buf,
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size_t datlen);
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static int evbuffer_ptr_subtract(struct evbuffer *buf, struct evbuffer_ptr *pos,
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size_t howfar);
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static int evbuffer_file_segment_materialize(struct evbuffer_file_segment *seg);
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static inline void evbuffer_chain_incref(struct evbuffer_chain *chain);
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static struct evbuffer_chain *
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evbuffer_chain_new(size_t size)
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{
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struct evbuffer_chain *chain;
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size_t to_alloc;
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if (size > EVBUFFER_CHAIN_MAX - EVBUFFER_CHAIN_SIZE)
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return (NULL);
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size += EVBUFFER_CHAIN_SIZE;
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/* get the next largest memory that can hold the buffer */
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if (size < EVBUFFER_CHAIN_MAX / 2) {
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to_alloc = MIN_BUFFER_SIZE;
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while (to_alloc < size) {
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to_alloc <<= 1;
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}
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} else {
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to_alloc = size;
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}
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/* we get everything in one chunk */
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if ((chain = mm_malloc(to_alloc)) == NULL)
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return (NULL);
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memset(chain, 0, EVBUFFER_CHAIN_SIZE);
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chain->buffer_len = to_alloc - EVBUFFER_CHAIN_SIZE;
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/* this way we can manipulate the buffer to different addresses,
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* which is required for mmap for example.
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*/
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chain->buffer = EVBUFFER_CHAIN_EXTRA(u_char, chain);
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chain->refcnt = 1;
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return (chain);
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}
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static inline void
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evbuffer_chain_free(struct evbuffer_chain *chain)
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{
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EVUTIL_ASSERT(chain->refcnt > 0);
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if (--chain->refcnt > 0) {
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/* chain is still referenced by other chains */
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return;
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}
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if (CHAIN_PINNED(chain)) {
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/* will get freed once no longer dangling */
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chain->refcnt++;
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chain->flags |= EVBUFFER_DANGLING;
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return;
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}
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/* safe to release chain, it's either a referencing
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* chain or all references to it have been freed */
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if (chain->flags & EVBUFFER_REFERENCE) {
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struct evbuffer_chain_reference *info =
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EVBUFFER_CHAIN_EXTRA(
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struct evbuffer_chain_reference,
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chain);
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if (info->cleanupfn)
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(*info->cleanupfn)(chain->buffer,
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chain->buffer_len,
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info->extra);
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}
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if (chain->flags & EVBUFFER_FILESEGMENT) {
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struct evbuffer_chain_file_segment *info =
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EVBUFFER_CHAIN_EXTRA(
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struct evbuffer_chain_file_segment,
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chain);
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if (info->segment) {
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#ifdef _WIN32
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if (info->segment->is_mapping)
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UnmapViewOfFile(chain->buffer);
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#endif
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evbuffer_file_segment_free(info->segment);
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}
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}
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if (chain->flags & EVBUFFER_MULTICAST) {
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struct evbuffer_multicast_parent *info =
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EVBUFFER_CHAIN_EXTRA(
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struct evbuffer_multicast_parent,
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chain);
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/* referencing chain is being freed, decrease
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* refcounts of source chain and associated
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* evbuffer (which get freed once both reach
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* zero) */
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EVUTIL_ASSERT(info->source != NULL);
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EVUTIL_ASSERT(info->parent != NULL);
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EVBUFFER_LOCK(info->source);
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evbuffer_chain_free(info->parent);
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evbuffer_decref_and_unlock_(info->source);
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}
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mm_free(chain);
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}
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static void
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evbuffer_free_all_chains(struct evbuffer_chain *chain)
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{
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struct evbuffer_chain *next;
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for (; chain; chain = next) {
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next = chain->next;
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evbuffer_chain_free(chain);
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}
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}
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#ifndef NDEBUG
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static int
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evbuffer_chains_all_empty(struct evbuffer_chain *chain)
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{
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for (; chain; chain = chain->next) {
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if (chain->off)
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return 0;
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}
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return 1;
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}
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#else
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/* The definition is needed for EVUTIL_ASSERT, which uses sizeof to avoid
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"unused variable" warnings. */
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static inline int evbuffer_chains_all_empty(struct evbuffer_chain *chain) {
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return 1;
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}
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#endif
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/* Free all trailing chains in 'buf' that are neither pinned nor empty, prior
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* to replacing them all with a new chain. Return a pointer to the place
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* where the new chain will go.
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*
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* Internal; requires lock. The caller must fix up buf->last and buf->first
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* as needed; they might have been freed.
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*/
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static struct evbuffer_chain **
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evbuffer_free_trailing_empty_chains(struct evbuffer *buf)
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{
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struct evbuffer_chain **ch = buf->last_with_datap;
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/* Find the first victim chain. It might be *last_with_datap */
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while ((*ch) && ((*ch)->off != 0 || CHAIN_PINNED(*ch)))
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ch = &(*ch)->next;
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if (*ch) {
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EVUTIL_ASSERT(evbuffer_chains_all_empty(*ch));
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evbuffer_free_all_chains(*ch);
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*ch = NULL;
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}
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return ch;
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}
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/* Add a single chain 'chain' to the end of 'buf', freeing trailing empty
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* chains as necessary. Requires lock. Does not schedule callbacks.
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*/
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static void
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evbuffer_chain_insert(struct evbuffer *buf,
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struct evbuffer_chain *chain)
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{
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ASSERT_EVBUFFER_LOCKED(buf);
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if (*buf->last_with_datap == NULL) {
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/* There are no chains data on the buffer at all. */
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EVUTIL_ASSERT(buf->last_with_datap == &buf->first);
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EVUTIL_ASSERT(buf->first == NULL);
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buf->first = buf->last = chain;
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} else {
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struct evbuffer_chain **chp;
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chp = evbuffer_free_trailing_empty_chains(buf);
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*chp = chain;
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if (chain->off)
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buf->last_with_datap = chp;
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buf->last = chain;
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}
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buf->total_len += chain->off;
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}
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static inline struct evbuffer_chain *
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evbuffer_chain_insert_new(struct evbuffer *buf, size_t datlen)
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{
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struct evbuffer_chain *chain;
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if ((chain = evbuffer_chain_new(datlen)) == NULL)
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return NULL;
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evbuffer_chain_insert(buf, chain);
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return chain;
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}
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void
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evbuffer_chain_pin_(struct evbuffer_chain *chain, unsigned flag)
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{
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EVUTIL_ASSERT((chain->flags & flag) == 0);
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chain->flags |= flag;
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}
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void
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evbuffer_chain_unpin_(struct evbuffer_chain *chain, unsigned flag)
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{
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EVUTIL_ASSERT((chain->flags & flag) != 0);
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chain->flags &= ~flag;
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if (chain->flags & EVBUFFER_DANGLING)
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evbuffer_chain_free(chain);
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}
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static inline void
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evbuffer_chain_incref(struct evbuffer_chain *chain)
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{
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++chain->refcnt;
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}
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struct evbuffer *
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evbuffer_new(void)
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{
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struct evbuffer *buffer;
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buffer = mm_calloc(1, sizeof(struct evbuffer));
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if (buffer == NULL)
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return (NULL);
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LIST_INIT(&buffer->callbacks);
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buffer->refcnt = 1;
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buffer->last_with_datap = &buffer->first;
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return (buffer);
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}
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int
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evbuffer_set_flags(struct evbuffer *buf, ev_uint64_t flags)
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{
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EVBUFFER_LOCK(buf);
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buf->flags |= (ev_uint32_t)flags;
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EVBUFFER_UNLOCK(buf);
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return 0;
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}
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int
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evbuffer_clear_flags(struct evbuffer *buf, ev_uint64_t flags)
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{
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EVBUFFER_LOCK(buf);
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buf->flags &= ~(ev_uint32_t)flags;
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EVBUFFER_UNLOCK(buf);
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return 0;
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}
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void
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evbuffer_incref_(struct evbuffer *buf)
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{
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EVBUFFER_LOCK(buf);
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++buf->refcnt;
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EVBUFFER_UNLOCK(buf);
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}
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void
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evbuffer_incref_and_lock_(struct evbuffer *buf)
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{
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EVBUFFER_LOCK(buf);
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++buf->refcnt;
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}
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int
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evbuffer_defer_callbacks(struct evbuffer *buffer, struct event_base *base)
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{
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EVBUFFER_LOCK(buffer);
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buffer->cb_queue = base;
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buffer->deferred_cbs = 1;
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event_deferred_cb_init_(&buffer->deferred,
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event_base_get_npriorities(base) / 2,
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evbuffer_deferred_callback, buffer);
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EVBUFFER_UNLOCK(buffer);
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return 0;
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}
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int
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evbuffer_enable_locking(struct evbuffer *buf, void *lock)
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{
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#ifdef EVENT__DISABLE_THREAD_SUPPORT
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return -1;
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#else
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if (buf->lock)
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return -1;
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if (!lock) {
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EVTHREAD_ALLOC_LOCK(lock, EVTHREAD_LOCKTYPE_RECURSIVE);
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if (!lock)
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return -1;
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buf->lock = lock;
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buf->own_lock = 1;
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} else {
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buf->lock = lock;
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buf->own_lock = 0;
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}
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return 0;
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#endif
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}
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void
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evbuffer_set_parent_(struct evbuffer *buf, struct bufferevent *bev)
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{
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EVBUFFER_LOCK(buf);
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buf->parent = bev;
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EVBUFFER_UNLOCK(buf);
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}
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|
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static void
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evbuffer_run_callbacks(struct evbuffer *buffer, int running_deferred)
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{
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struct evbuffer_cb_entry *cbent, *next;
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struct evbuffer_cb_info info;
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size_t new_size;
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ev_uint32_t mask, masked_val;
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int clear = 1;
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if (running_deferred) {
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mask = EVBUFFER_CB_NODEFER|EVBUFFER_CB_ENABLED;
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masked_val = EVBUFFER_CB_ENABLED;
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} else if (buffer->deferred_cbs) {
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mask = EVBUFFER_CB_NODEFER|EVBUFFER_CB_ENABLED;
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masked_val = EVBUFFER_CB_NODEFER|EVBUFFER_CB_ENABLED;
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/* Don't zero-out n_add/n_del, since the deferred callbacks
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will want to see them. */
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clear = 0;
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} else {
|
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mask = EVBUFFER_CB_ENABLED;
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masked_val = EVBUFFER_CB_ENABLED;
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}
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|
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ASSERT_EVBUFFER_LOCKED(buffer);
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|
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if (LIST_EMPTY(&buffer->callbacks)) {
|
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buffer->n_add_for_cb = buffer->n_del_for_cb = 0;
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return;
|
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}
|
|
if (buffer->n_add_for_cb == 0 && buffer->n_del_for_cb == 0)
|
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return;
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|
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new_size = buffer->total_len;
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info.orig_size = new_size + buffer->n_del_for_cb - buffer->n_add_for_cb;
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info.n_added = buffer->n_add_for_cb;
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info.n_deleted = buffer->n_del_for_cb;
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if (clear) {
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buffer->n_add_for_cb = 0;
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buffer->n_del_for_cb = 0;
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}
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for (cbent = LIST_FIRST(&buffer->callbacks);
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cbent != LIST_END(&buffer->callbacks);
|
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cbent = next) {
|
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/* Get the 'next' pointer now in case this callback decides
|
|
* to remove itself or something. */
|
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next = LIST_NEXT(cbent, next);
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|
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if ((cbent->flags & mask) != masked_val)
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continue;
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|
|
if ((cbent->flags & EVBUFFER_CB_OBSOLETE))
|
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cbent->cb.cb_obsolete(buffer,
|
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info.orig_size, new_size, cbent->cbarg);
|
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else
|
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cbent->cb.cb_func(buffer, &info, cbent->cbarg);
|
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}
|
|
}
|
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|
|
void
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evbuffer_invoke_callbacks_(struct evbuffer *buffer)
|
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{
|
|
if (LIST_EMPTY(&buffer->callbacks)) {
|
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buffer->n_add_for_cb = buffer->n_del_for_cb = 0;
|
|
return;
|
|
}
|
|
|
|
if (buffer->deferred_cbs) {
|
|
if (event_deferred_cb_schedule_(buffer->cb_queue, &buffer->deferred)) {
|
|
evbuffer_incref_and_lock_(buffer);
|
|
if (buffer->parent)
|
|
bufferevent_incref_(buffer->parent);
|
|
}
|
|
EVBUFFER_UNLOCK(buffer);
|
|
}
|
|
|
|
evbuffer_run_callbacks(buffer, 0);
|
|
}
|
|
|
|
static void
|
|
evbuffer_deferred_callback(struct event_callback *cb, void *arg)
|
|
{
|
|
struct bufferevent *parent = NULL;
|
|
struct evbuffer *buffer = arg;
|
|
|
|
/* XXXX It would be better to run these callbacks without holding the
|
|
* lock */
|
|
EVBUFFER_LOCK(buffer);
|
|
parent = buffer->parent;
|
|
evbuffer_run_callbacks(buffer, 1);
|
|
evbuffer_decref_and_unlock_(buffer);
|
|
if (parent)
|
|
bufferevent_decref_(parent);
|
|
}
|
|
|
|
static void
|
|
evbuffer_remove_all_callbacks(struct evbuffer *buffer)
|
|
{
|
|
struct evbuffer_cb_entry *cbent;
|
|
|
|
while ((cbent = LIST_FIRST(&buffer->callbacks))) {
|
|
LIST_REMOVE(cbent, next);
|
|
mm_free(cbent);
|
|
}
|
|
}
|
|
|
|
void
|
|
evbuffer_decref_and_unlock_(struct evbuffer *buffer)
|
|
{
|
|
struct evbuffer_chain *chain, *next;
|
|
ASSERT_EVBUFFER_LOCKED(buffer);
|
|
|
|
EVUTIL_ASSERT(buffer->refcnt > 0);
|
|
|
|
if (--buffer->refcnt > 0) {
|
|
EVBUFFER_UNLOCK(buffer);
|
|
return;
|
|
}
|
|
|
|
for (chain = buffer->first; chain != NULL; chain = next) {
|
|
next = chain->next;
|
|
evbuffer_chain_free(chain);
|
|
}
|
|
evbuffer_remove_all_callbacks(buffer);
|
|
if (buffer->deferred_cbs)
|
|
event_deferred_cb_cancel_(buffer->cb_queue, &buffer->deferred);
|
|
|
|
EVBUFFER_UNLOCK(buffer);
|
|
if (buffer->own_lock)
|
|
EVTHREAD_FREE_LOCK(buffer->lock, EVTHREAD_LOCKTYPE_RECURSIVE);
|
|
mm_free(buffer);
|
|
}
|
|
|
|
void
|
|
evbuffer_free(struct evbuffer *buffer)
|
|
{
|
|
EVBUFFER_LOCK(buffer);
|
|
evbuffer_decref_and_unlock_(buffer);
|
|
}
|
|
|
|
void
|
|
evbuffer_lock(struct evbuffer *buf)
|
|
{
|
|
EVBUFFER_LOCK(buf);
|
|
}
|
|
|
|
void
|
|
evbuffer_unlock(struct evbuffer *buf)
|
|
{
|
|
EVBUFFER_UNLOCK(buf);
|
|
}
|
|
|
|
size_t
|
|
evbuffer_get_length(const struct evbuffer *buffer)
|
|
{
|
|
size_t result;
|
|
|
|
EVBUFFER_LOCK(buffer);
|
|
|
|
result = (buffer->total_len);
|
|
|
|
EVBUFFER_UNLOCK(buffer);
|
|
|
|
return result;
|
|
}
|
|
|
|
size_t
|
|
evbuffer_get_contiguous_space(const struct evbuffer *buf)
|
|
{
|
|
struct evbuffer_chain *chain;
|
|
size_t result;
|
|
|
|
EVBUFFER_LOCK(buf);
|
|
chain = buf->first;
|
|
result = (chain != NULL ? chain->off : 0);
|
|
EVBUFFER_UNLOCK(buf);
|
|
|
|
return result;
|
|
}
|
|
|
|
size_t
|
|
evbuffer_add_iovec(struct evbuffer * buf, struct evbuffer_iovec * vec, int n_vec) {
|
|
int n;
|
|
size_t res;
|
|
size_t to_alloc;
|
|
|
|
EVBUFFER_LOCK(buf);
|
|
|
|
res = to_alloc = 0;
|
|
|
|
for (n = 0; n < n_vec; n++) {
|
|
to_alloc += vec[n].iov_len;
|
|
}
|
|
|
|
if (evbuffer_expand_fast_(buf, to_alloc, 2) < 0) {
|
|
goto done;
|
|
}
|
|
|
|
for (n = 0; n < n_vec; n++) {
|
|
/* XXX each 'add' call here does a bunch of setup that's
|
|
* obviated by evbuffer_expand_fast_, and some cleanup that we
|
|
* would like to do only once. Instead we should just extract
|
|
* the part of the code that's needed. */
|
|
|
|
if (evbuffer_add(buf, vec[n].iov_base, vec[n].iov_len) < 0) {
|
|
goto done;
|
|
}
|
|
|
|
res += vec[n].iov_len;
|
|
}
|
|
|
|
done:
|
|
EVBUFFER_UNLOCK(buf);
|
|
return res;
|
|
}
|
|
|
|
int
|
|
evbuffer_reserve_space(struct evbuffer *buf, ev_ssize_t size,
|
|
struct evbuffer_iovec *vec, int n_vecs)
|
|
{
|
|
struct evbuffer_chain *chain, **chainp;
|
|
int n = -1;
|
|
|
|
EVBUFFER_LOCK(buf);
|
|
if (buf->freeze_end)
|
|
goto done;
|
|
if (n_vecs < 1)
|
|
goto done;
|
|
if (n_vecs == 1) {
|
|
if ((chain = evbuffer_expand_singlechain(buf, size)) == NULL)
|
|
goto done;
|
|
|
|
vec[0].iov_base = CHAIN_SPACE_PTR(chain);
|
|
vec[0].iov_len = (size_t) CHAIN_SPACE_LEN(chain);
|
|
EVUTIL_ASSERT(size<0 || (size_t)vec[0].iov_len >= (size_t)size);
|
|
n = 1;
|
|
} else {
|
|
if (evbuffer_expand_fast_(buf, size, n_vecs)<0)
|
|
goto done;
|
|
n = evbuffer_read_setup_vecs_(buf, size, vec, n_vecs,
|
|
&chainp, 0);
|
|
}
|
|
|
|
done:
|
|
EVBUFFER_UNLOCK(buf);
|
|
return n;
|
|
|
|
}
|
|
|
|
static int
|
|
advance_last_with_data(struct evbuffer *buf)
|
|
{
|
|
int n = 0;
|
|
ASSERT_EVBUFFER_LOCKED(buf);
|
|
|
|
if (!*buf->last_with_datap)
|
|
return 0;
|
|
|
|
while ((*buf->last_with_datap)->next && (*buf->last_with_datap)->next->off) {
|
|
buf->last_with_datap = &(*buf->last_with_datap)->next;
|
|
++n;
|
|
}
|
|
return n;
|
|
}
|
|
|
|
int
|
|
evbuffer_commit_space(struct evbuffer *buf,
|
|
struct evbuffer_iovec *vec, int n_vecs)
|
|
{
|
|
struct evbuffer_chain *chain, **firstchainp, **chainp;
|
|
int result = -1;
|
|
size_t added = 0;
|
|
int i;
|
|
|
|
EVBUFFER_LOCK(buf);
|
|
|
|
if (buf->freeze_end)
|
|
goto done;
|
|
if (n_vecs == 0) {
|
|
result = 0;
|
|
goto done;
|
|
} else if (n_vecs == 1 &&
|
|
(buf->last && vec[0].iov_base == (void*)CHAIN_SPACE_PTR(buf->last))) {
|
|
/* The user only got or used one chain; it might not
|
|
* be the first one with space in it. */
|
|
if ((size_t)vec[0].iov_len > (size_t)CHAIN_SPACE_LEN(buf->last))
|
|
goto done;
|
|
buf->last->off += vec[0].iov_len;
|
|
added = vec[0].iov_len;
|
|
if (added)
|
|
advance_last_with_data(buf);
|
|
goto okay;
|
|
}
|
|
|
|
/* Advance 'firstchain' to the first chain with space in it. */
|
|
firstchainp = buf->last_with_datap;
|
|
if (!*firstchainp)
|
|
goto done;
|
|
if (CHAIN_SPACE_LEN(*firstchainp) == 0) {
|
|
firstchainp = &(*firstchainp)->next;
|
|
}
|
|
|
|
chain = *firstchainp;
|
|
/* pass 1: make sure that the pointers and lengths of vecs[] are in
|
|
* bounds before we try to commit anything. */
|
|
for (i=0; i<n_vecs; ++i) {
|
|
if (!chain)
|
|
goto done;
|
|
if (vec[i].iov_base != (void*)CHAIN_SPACE_PTR(chain) ||
|
|
(size_t)vec[i].iov_len > CHAIN_SPACE_LEN(chain))
|
|
goto done;
|
|
chain = chain->next;
|
|
}
|
|
/* pass 2: actually adjust all the chains. */
|
|
chainp = firstchainp;
|
|
for (i=0; i<n_vecs; ++i) {
|
|
(*chainp)->off += vec[i].iov_len;
|
|
added += vec[i].iov_len;
|
|
if (vec[i].iov_len) {
|
|
buf->last_with_datap = chainp;
|
|
}
|
|
chainp = &(*chainp)->next;
|
|
}
|
|
|
|
okay:
|
|
buf->total_len += added;
|
|
buf->n_add_for_cb += added;
|
|
result = 0;
|
|
evbuffer_invoke_callbacks_(buf);
|
|
|
|
done:
|
|
EVBUFFER_UNLOCK(buf);
|
|
return result;
|
|
}
|
|
|
|
static inline int
|
|
HAS_PINNED_R(struct evbuffer *buf)
|
|
{
|
|
return (buf->last && CHAIN_PINNED_R(buf->last));
|
|
}
|
|
|
|
static inline void
|
|
ZERO_CHAIN(struct evbuffer *dst)
|
|
{
|
|
ASSERT_EVBUFFER_LOCKED(dst);
|
|
dst->first = NULL;
|
|
dst->last = NULL;
|
|
dst->last_with_datap = &(dst)->first;
|
|
dst->total_len = 0;
|
|
}
|
|
|
|
/* Prepares the contents of src to be moved to another buffer by removing
|
|
* read-pinned chains. The first pinned chain is saved in first, and the
|
|
* last in last. If src has no read-pinned chains, first and last are set
|
|
* to NULL. */
|
|
static int
|
|
PRESERVE_PINNED(struct evbuffer *src, struct evbuffer_chain **first,
|
|
struct evbuffer_chain **last)
|
|
{
|
|
struct evbuffer_chain *chain, **pinned;
|
|
|
|
ASSERT_EVBUFFER_LOCKED(src);
|
|
|
|
if (!HAS_PINNED_R(src)) {
|
|
*first = *last = NULL;
|
|
return 0;
|
|
}
|
|
|
|
pinned = src->last_with_datap;
|
|
if (!CHAIN_PINNED_R(*pinned))
|
|
pinned = &(*pinned)->next;
|
|
EVUTIL_ASSERT(CHAIN_PINNED_R(*pinned));
|
|
chain = *first = *pinned;
|
|
*last = src->last;
|
|
|
|
/* If there's data in the first pinned chain, we need to allocate
|
|
* a new chain and copy the data over. */
|
|
if (chain->off) {
|
|
struct evbuffer_chain *tmp;
|
|
|
|
EVUTIL_ASSERT(pinned == src->last_with_datap);
|
|
tmp = evbuffer_chain_new(chain->off);
|
|
if (!tmp)
|
|
return -1;
|
|
memcpy(tmp->buffer, chain->buffer + chain->misalign,
|
|
chain->off);
|
|
tmp->off = chain->off;
|
|
*src->last_with_datap = tmp;
|
|
src->last = tmp;
|
|
chain->misalign += chain->off;
|
|
chain->off = 0;
|
|
} else {
|
|
src->last = *src->last_with_datap;
|
|
*pinned = NULL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static inline void
|
|
RESTORE_PINNED(struct evbuffer *src, struct evbuffer_chain *pinned,
|
|
struct evbuffer_chain *last)
|
|
{
|
|
ASSERT_EVBUFFER_LOCKED(src);
|
|
|
|
if (!pinned) {
|
|
ZERO_CHAIN(src);
|
|
return;
|
|
}
|
|
|
|
src->first = pinned;
|
|
src->last = last;
|
|
src->last_with_datap = &src->first;
|
|
src->total_len = 0;
|
|
}
|
|
|
|
static inline void
|
|
COPY_CHAIN(struct evbuffer *dst, struct evbuffer *src)
|
|
{
|
|
ASSERT_EVBUFFER_LOCKED(dst);
|
|
ASSERT_EVBUFFER_LOCKED(src);
|
|
dst->first = src->first;
|
|
if (src->last_with_datap == &src->first)
|
|
dst->last_with_datap = &dst->first;
|
|
else
|
|
dst->last_with_datap = src->last_with_datap;
|
|
dst->last = src->last;
|
|
dst->total_len = src->total_len;
|
|
}
|
|
|
|
static void
|
|
APPEND_CHAIN(struct evbuffer *dst, struct evbuffer *src)
|
|
{
|
|
ASSERT_EVBUFFER_LOCKED(dst);
|
|
ASSERT_EVBUFFER_LOCKED(src);
|
|
dst->last->next = src->first;
|
|
if (src->last_with_datap == &src->first)
|
|
dst->last_with_datap = &dst->last->next;
|
|
else
|
|
dst->last_with_datap = src->last_with_datap;
|
|
dst->last = src->last;
|
|
dst->total_len += src->total_len;
|
|
}
|
|
|
|
static inline void
|
|
APPEND_CHAIN_MULTICAST(struct evbuffer *dst, struct evbuffer *src)
|
|
{
|
|
struct evbuffer_chain *tmp;
|
|
struct evbuffer_chain *chain = src->first;
|
|
struct evbuffer_multicast_parent *extra;
|
|
|
|
ASSERT_EVBUFFER_LOCKED(dst);
|
|
ASSERT_EVBUFFER_LOCKED(src);
|
|
|
|
for (; chain; chain = chain->next) {
|
|
if (!chain->off || chain->flags & EVBUFFER_DANGLING) {
|
|
/* skip empty chains */
|
|
continue;
|
|
}
|
|
|
|
tmp = evbuffer_chain_new(sizeof(struct evbuffer_multicast_parent));
|
|
if (!tmp) {
|
|
event_warn("%s: out of memory", __func__);
|
|
return;
|
|
}
|
|
extra = EVBUFFER_CHAIN_EXTRA(struct evbuffer_multicast_parent, tmp);
|
|
/* reference evbuffer containing source chain so it
|
|
* doesn't get released while the chain is still
|
|
* being referenced to */
|
|
evbuffer_incref_(src);
|
|
extra->source = src;
|
|
/* reference source chain which now becomes immutable */
|
|
evbuffer_chain_incref(chain);
|
|
extra->parent = chain;
|
|
chain->flags |= EVBUFFER_IMMUTABLE;
|
|
tmp->buffer_len = chain->buffer_len;
|
|
tmp->misalign = chain->misalign;
|
|
tmp->off = chain->off;
|
|
tmp->flags |= EVBUFFER_MULTICAST|EVBUFFER_IMMUTABLE;
|
|
tmp->buffer = chain->buffer;
|
|
evbuffer_chain_insert(dst, tmp);
|
|
}
|
|
}
|
|
|
|
static void
|
|
PREPEND_CHAIN(struct evbuffer *dst, struct evbuffer *src)
|
|
{
|
|
ASSERT_EVBUFFER_LOCKED(dst);
|
|
ASSERT_EVBUFFER_LOCKED(src);
|
|
src->last->next = dst->first;
|
|
dst->first = src->first;
|
|
dst->total_len += src->total_len;
|
|
if (*dst->last_with_datap == NULL) {
|
|
if (src->last_with_datap == &(src)->first)
|
|
dst->last_with_datap = &dst->first;
|
|
else
|
|
dst->last_with_datap = src->last_with_datap;
|
|
} else if (dst->last_with_datap == &dst->first) {
|
|
dst->last_with_datap = &src->last->next;
|
|
}
|
|
}
|
|
|
|
int
|
|
evbuffer_add_buffer(struct evbuffer *outbuf, struct evbuffer *inbuf)
|
|
{
|
|
struct evbuffer_chain *pinned, *last;
|
|
size_t in_total_len, out_total_len;
|
|
int result = 0;
|
|
|
|
EVBUFFER_LOCK2(inbuf, outbuf);
|
|
in_total_len = inbuf->total_len;
|
|
out_total_len = outbuf->total_len;
|
|
|
|
if (in_total_len == 0 || outbuf == inbuf)
|
|
goto done;
|
|
|
|
if (outbuf->freeze_end || inbuf->freeze_start) {
|
|
result = -1;
|
|
goto done;
|
|
}
|
|
|
|
if (PRESERVE_PINNED(inbuf, &pinned, &last) < 0) {
|
|
result = -1;
|
|
goto done;
|
|
}
|
|
|
|
if (out_total_len == 0) {
|
|
/* There might be an empty chain at the start of outbuf; free
|
|
* it. */
|
|
evbuffer_free_all_chains(outbuf->first);
|
|
COPY_CHAIN(outbuf, inbuf);
|
|
} else {
|
|
APPEND_CHAIN(outbuf, inbuf);
|
|
}
|
|
|
|
RESTORE_PINNED(inbuf, pinned, last);
|
|
|
|
inbuf->n_del_for_cb += in_total_len;
|
|
outbuf->n_add_for_cb += in_total_len;
|
|
|
|
evbuffer_invoke_callbacks_(inbuf);
|
|
evbuffer_invoke_callbacks_(outbuf);
|
|
|
|
done:
|
|
EVBUFFER_UNLOCK2(inbuf, outbuf);
|
|
return result;
|
|
}
|
|
|
|
int
|
|
evbuffer_add_buffer_reference(struct evbuffer *outbuf, struct evbuffer *inbuf)
|
|
{
|
|
size_t in_total_len, out_total_len;
|
|
struct evbuffer_chain *chain;
|
|
int result = 0;
|
|
|
|
EVBUFFER_LOCK2(inbuf, outbuf);
|
|
in_total_len = inbuf->total_len;
|
|
out_total_len = outbuf->total_len;
|
|
chain = inbuf->first;
|
|
|
|
if (in_total_len == 0)
|
|
goto done;
|
|
|
|
if (outbuf->freeze_end || outbuf == inbuf) {
|
|
result = -1;
|
|
goto done;
|
|
}
|
|
|
|
for (; chain; chain = chain->next) {
|
|
if ((chain->flags & (EVBUFFER_FILESEGMENT|EVBUFFER_SENDFILE|EVBUFFER_MULTICAST)) != 0) {
|
|
/* chain type can not be referenced */
|
|
result = -1;
|
|
goto done;
|
|
}
|
|
}
|
|
|
|
if (out_total_len == 0) {
|
|
/* There might be an empty chain at the start of outbuf; free
|
|
* it. */
|
|
evbuffer_free_all_chains(outbuf->first);
|
|
}
|
|
APPEND_CHAIN_MULTICAST(outbuf, inbuf);
|
|
|
|
outbuf->n_add_for_cb += in_total_len;
|
|
evbuffer_invoke_callbacks_(outbuf);
|
|
|
|
done:
|
|
EVBUFFER_UNLOCK2(inbuf, outbuf);
|
|
return result;
|
|
}
|
|
|
|
int
|
|
evbuffer_prepend_buffer(struct evbuffer *outbuf, struct evbuffer *inbuf)
|
|
{
|
|
struct evbuffer_chain *pinned, *last;
|
|
size_t in_total_len, out_total_len;
|
|
int result = 0;
|
|
|
|
EVBUFFER_LOCK2(inbuf, outbuf);
|
|
|
|
in_total_len = inbuf->total_len;
|
|
out_total_len = outbuf->total_len;
|
|
|
|
if (!in_total_len || inbuf == outbuf)
|
|
goto done;
|
|
|
|
if (outbuf->freeze_start || inbuf->freeze_start) {
|
|
result = -1;
|
|
goto done;
|
|
}
|
|
|
|
if (PRESERVE_PINNED(inbuf, &pinned, &last) < 0) {
|
|
result = -1;
|
|
goto done;
|
|
}
|
|
|
|
if (out_total_len == 0) {
|
|
/* There might be an empty chain at the start of outbuf; free
|
|
* it. */
|
|
evbuffer_free_all_chains(outbuf->first);
|
|
COPY_CHAIN(outbuf, inbuf);
|
|
} else {
|
|
PREPEND_CHAIN(outbuf, inbuf);
|
|
}
|
|
|
|
RESTORE_PINNED(inbuf, pinned, last);
|
|
|
|
inbuf->n_del_for_cb += in_total_len;
|
|
outbuf->n_add_for_cb += in_total_len;
|
|
|
|
evbuffer_invoke_callbacks_(inbuf);
|
|
evbuffer_invoke_callbacks_(outbuf);
|
|
done:
|
|
EVBUFFER_UNLOCK2(inbuf, outbuf);
|
|
return result;
|
|
}
|
|
|
|
int
|
|
evbuffer_drain(struct evbuffer *buf, size_t len)
|
|
{
|
|
struct evbuffer_chain *chain, *next;
|
|
size_t remaining, old_len;
|
|
int result = 0;
|
|
|
|
EVBUFFER_LOCK(buf);
|
|
old_len = buf->total_len;
|
|
|
|
if (old_len == 0)
|
|
goto done;
|
|
|
|
if (buf->freeze_start) {
|
|
result = -1;
|
|
goto done;
|
|
}
|
|
|
|
if (len >= old_len && !HAS_PINNED_R(buf)) {
|
|
len = old_len;
|
|
for (chain = buf->first; chain != NULL; chain = next) {
|
|
next = chain->next;
|
|
evbuffer_chain_free(chain);
|
|
}
|
|
|
|
ZERO_CHAIN(buf);
|
|
} else {
|
|
if (len >= old_len)
|
|
len = old_len;
|
|
|
|
buf->total_len -= len;
|
|
remaining = len;
|
|
for (chain = buf->first;
|
|
remaining >= chain->off;
|
|
chain = next) {
|
|
next = chain->next;
|
|
remaining -= chain->off;
|
|
|
|
if (chain == *buf->last_with_datap) {
|
|
buf->last_with_datap = &buf->first;
|
|
}
|
|
if (&chain->next == buf->last_with_datap)
|
|
buf->last_with_datap = &buf->first;
|
|
|
|
if (CHAIN_PINNED_R(chain)) {
|
|
EVUTIL_ASSERT(remaining == 0);
|
|
chain->misalign += chain->off;
|
|
chain->off = 0;
|
|
break;
|
|
} else
|
|
evbuffer_chain_free(chain);
|
|
}
|
|
|
|
buf->first = chain;
|
|
EVUTIL_ASSERT(chain && remaining <= chain->off);
|
|
chain->misalign += remaining;
|
|
chain->off -= remaining;
|
|
}
|
|
|
|
buf->n_del_for_cb += len;
|
|
/* Tell someone about changes in this buffer */
|
|
evbuffer_invoke_callbacks_(buf);
|
|
|
|
done:
|
|
EVBUFFER_UNLOCK(buf);
|
|
return result;
|
|
}
|
|
|
|
/* Reads data from an event buffer and drains the bytes read */
|
|
int
|
|
evbuffer_remove(struct evbuffer *buf, void *data_out, size_t datlen)
|
|
{
|
|
ev_ssize_t n;
|
|
EVBUFFER_LOCK(buf);
|
|
n = evbuffer_copyout_from(buf, NULL, data_out, datlen);
|
|
if (n > 0) {
|
|
if (evbuffer_drain(buf, n)<0)
|
|
n = -1;
|
|
}
|
|
EVBUFFER_UNLOCK(buf);
|
|
return (int)n;
|
|
}
|
|
|
|
ev_ssize_t
|
|
evbuffer_copyout(struct evbuffer *buf, void *data_out, size_t datlen)
|
|
{
|
|
return evbuffer_copyout_from(buf, NULL, data_out, datlen);
|
|
}
|
|
|
|
ev_ssize_t
|
|
evbuffer_copyout_from(struct evbuffer *buf, const struct evbuffer_ptr *pos,
|
|
void *data_out, size_t datlen)
|
|
{
|
|
/*XXX fails badly on sendfile case. */
|
|
struct evbuffer_chain *chain;
|
|
char *data = data_out;
|
|
size_t nread;
|
|
ev_ssize_t result = 0;
|
|
size_t pos_in_chain;
|
|
|
|
EVBUFFER_LOCK(buf);
|
|
|
|
if (pos) {
|
|
if (datlen > (size_t)(EV_SSIZE_MAX - pos->pos)) {
|
|
result = -1;
|
|
goto done;
|
|
}
|
|
chain = pos->internal_.chain;
|
|
pos_in_chain = pos->internal_.pos_in_chain;
|
|
if (datlen + pos->pos > buf->total_len)
|
|
datlen = buf->total_len - pos->pos;
|
|
} else {
|
|
chain = buf->first;
|
|
pos_in_chain = 0;
|
|
if (datlen > buf->total_len)
|
|
datlen = buf->total_len;
|
|
}
|
|
|
|
|
|
if (datlen == 0)
|
|
goto done;
|
|
|
|
if (buf->freeze_start) {
|
|
result = -1;
|
|
goto done;
|
|
}
|
|
|
|
nread = datlen;
|
|
|
|
while (datlen && datlen >= chain->off - pos_in_chain) {
|
|
size_t copylen = chain->off - pos_in_chain;
|
|
memcpy(data,
|
|
chain->buffer + chain->misalign + pos_in_chain,
|
|
copylen);
|
|
data += copylen;
|
|
datlen -= copylen;
|
|
|
|
chain = chain->next;
|
|
pos_in_chain = 0;
|
|
EVUTIL_ASSERT(chain || datlen==0);
|
|
}
|
|
|
|
if (datlen) {
|
|
EVUTIL_ASSERT(chain);
|
|
EVUTIL_ASSERT(datlen+pos_in_chain <= chain->off);
|
|
|
|
memcpy(data, chain->buffer + chain->misalign + pos_in_chain,
|
|
datlen);
|
|
}
|
|
|
|
result = nread;
|
|
done:
|
|
EVBUFFER_UNLOCK(buf);
|
|
return result;
|
|
}
|
|
|
|
/* reads data from the src buffer to the dst buffer, avoids memcpy as
|
|
* possible. */
|
|
/* XXXX should return ev_ssize_t */
|
|
int
|
|
evbuffer_remove_buffer(struct evbuffer *src, struct evbuffer *dst,
|
|
size_t datlen)
|
|
{
|
|
/*XXX We should have an option to force this to be zero-copy.*/
|
|
|
|
/*XXX can fail badly on sendfile case. */
|
|
struct evbuffer_chain *chain, *previous;
|
|
size_t nread = 0;
|
|
int result;
|
|
|
|
EVBUFFER_LOCK2(src, dst);
|
|
|
|
chain = previous = src->first;
|
|
|
|
if (datlen == 0 || dst == src) {
|
|
result = 0;
|
|
goto done;
|
|
}
|
|
|
|
if (dst->freeze_end || src->freeze_start) {
|
|
result = -1;
|
|
goto done;
|
|
}
|
|
|
|
/* short-cut if there is no more data buffered */
|
|
if (datlen >= src->total_len) {
|
|
datlen = src->total_len;
|
|
evbuffer_add_buffer(dst, src);
|
|
result = (int)datlen; /*XXXX should return ev_ssize_t*/
|
|
goto done;
|
|
}
|
|
|
|
/* removes chains if possible */
|
|
while (chain->off <= datlen) {
|
|
/* We can't remove the last with data from src unless we
|
|
* remove all chains, in which case we would have done the if
|
|
* block above */
|
|
EVUTIL_ASSERT(chain != *src->last_with_datap);
|
|
nread += chain->off;
|
|
datlen -= chain->off;
|
|
previous = chain;
|
|
if (src->last_with_datap == &chain->next)
|
|
src->last_with_datap = &src->first;
|
|
chain = chain->next;
|
|
}
|
|
|
|
if (nread) {
|
|
/* we can remove the chain */
|
|
struct evbuffer_chain **chp;
|
|
chp = evbuffer_free_trailing_empty_chains(dst);
|
|
|
|
if (dst->first == NULL) {
|
|
dst->first = src->first;
|
|
} else {
|
|
*chp = src->first;
|
|
}
|
|
dst->last = previous;
|
|
previous->next = NULL;
|
|
src->first = chain;
|
|
advance_last_with_data(dst);
|
|
|
|
dst->total_len += nread;
|
|
dst->n_add_for_cb += nread;
|
|
}
|
|
|
|
/* we know that there is more data in the src buffer than
|
|
* we want to read, so we manually drain the chain */
|
|
evbuffer_add(dst, chain->buffer + chain->misalign, datlen);
|
|
chain->misalign += datlen;
|
|
chain->off -= datlen;
|
|
nread += datlen;
|
|
|
|
/* You might think we would want to increment dst->n_add_for_cb
|
|
* here too. But evbuffer_add above already took care of that.
|
|
*/
|
|
src->total_len -= nread;
|
|
src->n_del_for_cb += nread;
|
|
|
|
if (nread) {
|
|
evbuffer_invoke_callbacks_(dst);
|
|
evbuffer_invoke_callbacks_(src);
|
|
}
|
|
result = (int)nread;/*XXXX should change return type */
|
|
|
|
done:
|
|
EVBUFFER_UNLOCK2(src, dst);
|
|
return result;
|
|
}
|
|
|
|
unsigned char *
|
|
evbuffer_pullup(struct evbuffer *buf, ev_ssize_t size)
|
|
{
|
|
struct evbuffer_chain *chain, *next, *tmp, *last_with_data;
|
|
unsigned char *buffer, *result = NULL;
|
|
ev_ssize_t remaining;
|
|
int removed_last_with_data = 0;
|
|
int removed_last_with_datap = 0;
|
|
|
|
EVBUFFER_LOCK(buf);
|
|
|
|
chain = buf->first;
|
|
|
|
if (size < 0)
|
|
size = buf->total_len;
|
|
/* if size > buf->total_len, we cannot guarantee to the user that she
|
|
* is going to have a long enough buffer afterwards; so we return
|
|
* NULL */
|
|
if (size == 0 || (size_t)size > buf->total_len)
|
|
goto done;
|
|
|
|
/* No need to pull up anything; the first size bytes are
|
|
* already here. */
|
|
if (chain->off >= (size_t)size) {
|
|
result = chain->buffer + chain->misalign;
|
|
goto done;
|
|
}
|
|
|
|
/* Make sure that none of the chains we need to copy from is pinned. */
|
|
remaining = size - chain->off;
|
|
EVUTIL_ASSERT(remaining >= 0);
|
|
for (tmp=chain->next; tmp; tmp=tmp->next) {
|
|
if (CHAIN_PINNED(tmp))
|
|
goto done;
|
|
if (tmp->off >= (size_t)remaining)
|
|
break;
|
|
remaining -= tmp->off;
|
|
}
|
|
|
|
if (CHAIN_PINNED(chain)) {
|
|
size_t old_off = chain->off;
|
|
if (CHAIN_SPACE_LEN(chain) < size - chain->off) {
|
|
/* not enough room at end of chunk. */
|
|
goto done;
|
|
}
|
|
buffer = CHAIN_SPACE_PTR(chain);
|
|
tmp = chain;
|
|
tmp->off = size;
|
|
size -= old_off;
|
|
chain = chain->next;
|
|
} else if (chain->buffer_len - chain->misalign >= (size_t)size) {
|
|
/* already have enough space in the first chain */
|
|
size_t old_off = chain->off;
|
|
buffer = chain->buffer + chain->misalign + chain->off;
|
|
tmp = chain;
|
|
tmp->off = size;
|
|
size -= old_off;
|
|
chain = chain->next;
|
|
} else {
|
|
if ((tmp = evbuffer_chain_new(size)) == NULL) {
|
|
event_warn("%s: out of memory", __func__);
|
|
goto done;
|
|
}
|
|
buffer = tmp->buffer;
|
|
tmp->off = size;
|
|
buf->first = tmp;
|
|
}
|
|
|
|
/* TODO(niels): deal with buffers that point to NULL like sendfile */
|
|
|
|
/* Copy and free every chunk that will be entirely pulled into tmp */
|
|
last_with_data = *buf->last_with_datap;
|
|
for (; chain != NULL && (size_t)size >= chain->off; chain = next) {
|
|
next = chain->next;
|
|
|
|
memcpy(buffer, chain->buffer + chain->misalign, chain->off);
|
|
size -= chain->off;
|
|
buffer += chain->off;
|
|
if (chain == last_with_data)
|
|
removed_last_with_data = 1;
|
|
if (&chain->next == buf->last_with_datap)
|
|
removed_last_with_datap = 1;
|
|
|
|
evbuffer_chain_free(chain);
|
|
}
|
|
|
|
if (chain != NULL) {
|
|
memcpy(buffer, chain->buffer + chain->misalign, size);
|
|
chain->misalign += size;
|
|
chain->off -= size;
|
|
} else {
|
|
buf->last = tmp;
|
|
}
|
|
|
|
tmp->next = chain;
|
|
|
|
if (removed_last_with_data) {
|
|
buf->last_with_datap = &buf->first;
|
|
} else if (removed_last_with_datap) {
|
|
if (buf->first->next && buf->first->next->off)
|
|
buf->last_with_datap = &buf->first->next;
|
|
else
|
|
buf->last_with_datap = &buf->first;
|
|
}
|
|
|
|
result = (tmp->buffer + tmp->misalign);
|
|
|
|
done:
|
|
EVBUFFER_UNLOCK(buf);
|
|
return result;
|
|
}
|
|
|
|
/*
|
|
* Reads a line terminated by either '\r\n', '\n\r' or '\r' or '\n'.
|
|
* The returned buffer needs to be freed by the called.
|
|
*/
|
|
char *
|
|
evbuffer_readline(struct evbuffer *buffer)
|
|
{
|
|
return evbuffer_readln(buffer, NULL, EVBUFFER_EOL_ANY);
|
|
}
|
|
|
|
static inline ev_ssize_t
|
|
evbuffer_strchr(struct evbuffer_ptr *it, const char chr)
|
|
{
|
|
struct evbuffer_chain *chain = it->internal_.chain;
|
|
size_t i = it->internal_.pos_in_chain;
|
|
while (chain != NULL) {
|
|
char *buffer = (char *)chain->buffer + chain->misalign;
|
|
char *cp = memchr(buffer+i, chr, chain->off-i);
|
|
if (cp) {
|
|
it->internal_.chain = chain;
|
|
it->internal_.pos_in_chain = cp - buffer;
|
|
it->pos += (cp - buffer - i);
|
|
return it->pos;
|
|
}
|
|
it->pos += chain->off - i;
|
|
i = 0;
|
|
chain = chain->next;
|
|
}
|
|
|
|
return (-1);
|
|
}
|
|
|
|
static inline char *
|
|
find_eol_char(char *s, size_t len)
|
|
{
|
|
#define CHUNK_SZ 128
|
|
/* Lots of benchmarking found this approach to be faster in practice
|
|
* than doing two memchrs over the whole buffer, doin a memchr on each
|
|
* char of the buffer, or trying to emulate memchr by hand. */
|
|
char *s_end, *cr, *lf;
|
|
s_end = s+len;
|
|
while (s < s_end) {
|
|
size_t chunk = (s + CHUNK_SZ < s_end) ? CHUNK_SZ : (s_end - s);
|
|
cr = memchr(s, '\r', chunk);
|
|
lf = memchr(s, '\n', chunk);
|
|
if (cr) {
|
|
if (lf && lf < cr)
|
|
return lf;
|
|
return cr;
|
|
} else if (lf) {
|
|
return lf;
|
|
}
|
|
s += CHUNK_SZ;
|
|
}
|
|
|
|
return NULL;
|
|
#undef CHUNK_SZ
|
|
}
|
|
|
|
static ev_ssize_t
|
|
evbuffer_find_eol_char(struct evbuffer_ptr *it)
|
|
{
|
|
struct evbuffer_chain *chain = it->internal_.chain;
|
|
size_t i = it->internal_.pos_in_chain;
|
|
while (chain != NULL) {
|
|
char *buffer = (char *)chain->buffer + chain->misalign;
|
|
char *cp = find_eol_char(buffer+i, chain->off-i);
|
|
if (cp) {
|
|
it->internal_.chain = chain;
|
|
it->internal_.pos_in_chain = cp - buffer;
|
|
it->pos += (cp - buffer) - i;
|
|
return it->pos;
|
|
}
|
|
it->pos += chain->off - i;
|
|
i = 0;
|
|
chain = chain->next;
|
|
}
|
|
|
|
return (-1);
|
|
}
|
|
|
|
static inline int
|
|
evbuffer_strspn(
|
|
struct evbuffer_ptr *ptr, const char *chrset)
|
|
{
|
|
int count = 0;
|
|
struct evbuffer_chain *chain = ptr->internal_.chain;
|
|
size_t i = ptr->internal_.pos_in_chain;
|
|
|
|
if (!chain)
|
|
return 0;
|
|
|
|
while (1) {
|
|
char *buffer = (char *)chain->buffer + chain->misalign;
|
|
for (; i < chain->off; ++i) {
|
|
const char *p = chrset;
|
|
while (*p) {
|
|
if (buffer[i] == *p++)
|
|
goto next;
|
|
}
|
|
ptr->internal_.chain = chain;
|
|
ptr->internal_.pos_in_chain = i;
|
|
ptr->pos += count;
|
|
return count;
|
|
next:
|
|
++count;
|
|
}
|
|
i = 0;
|
|
|
|
if (! chain->next) {
|
|
ptr->internal_.chain = chain;
|
|
ptr->internal_.pos_in_chain = i;
|
|
ptr->pos += count;
|
|
return count;
|
|
}
|
|
|
|
chain = chain->next;
|
|
}
|
|
}
|
|
|
|
|
|
static inline int
|
|
evbuffer_getchr(struct evbuffer_ptr *it)
|
|
{
|
|
struct evbuffer_chain *chain = it->internal_.chain;
|
|
size_t off = it->internal_.pos_in_chain;
|
|
|
|
if (chain == NULL)
|
|
return -1;
|
|
|
|
return (unsigned char)chain->buffer[chain->misalign + off];
|
|
}
|
|
|
|
struct evbuffer_ptr
|
|
evbuffer_search_eol(struct evbuffer *buffer,
|
|
struct evbuffer_ptr *start, size_t *eol_len_out,
|
|
enum evbuffer_eol_style eol_style)
|
|
{
|
|
struct evbuffer_ptr it, it2;
|
|
size_t extra_drain = 0;
|
|
int ok = 0;
|
|
|
|
/* Avoid locking in trivial edge cases */
|
|
if (start && start->internal_.chain == NULL) {
|
|
PTR_NOT_FOUND(&it);
|
|
if (eol_len_out)
|
|
*eol_len_out = extra_drain;
|
|
return it;
|
|
}
|
|
|
|
EVBUFFER_LOCK(buffer);
|
|
|
|
if (start) {
|
|
memcpy(&it, start, sizeof(it));
|
|
} else {
|
|
it.pos = 0;
|
|
it.internal_.chain = buffer->first;
|
|
it.internal_.pos_in_chain = 0;
|
|
}
|
|
|
|
/* the eol_style determines our first stop character and how many
|
|
* characters we are going to drain afterwards. */
|
|
switch (eol_style) {
|
|
case EVBUFFER_EOL_ANY:
|
|
if (evbuffer_find_eol_char(&it) < 0)
|
|
goto done;
|
|
memcpy(&it2, &it, sizeof(it));
|
|
extra_drain = evbuffer_strspn(&it2, "\r\n");
|
|
break;
|
|
case EVBUFFER_EOL_CRLF_STRICT: {
|
|
it = evbuffer_search(buffer, "\r\n", 2, &it);
|
|
if (it.pos < 0)
|
|
goto done;
|
|
extra_drain = 2;
|
|
break;
|
|
}
|
|
case EVBUFFER_EOL_CRLF: {
|
|
ev_ssize_t start_pos = it.pos;
|
|
/* Look for a LF ... */
|
|
if (evbuffer_strchr(&it, '\n') < 0)
|
|
goto done;
|
|
extra_drain = 1;
|
|
/* ... optionally preceeded by a CR. */
|
|
if (it.pos == start_pos)
|
|
break; /* If the first character is \n, don't back up */
|
|
/* This potentially does an extra linear walk over the first
|
|
* few chains. Probably, that's not too expensive unless you
|
|
* have a really pathological setup. */
|
|
memcpy(&it2, &it, sizeof(it));
|
|
if (evbuffer_ptr_subtract(buffer, &it2, 1)<0)
|
|
break;
|
|
if (evbuffer_getchr(&it2) == '\r') {
|
|
memcpy(&it, &it2, sizeof(it));
|
|
extra_drain = 2;
|
|
}
|
|
break;
|
|
}
|
|
case EVBUFFER_EOL_LF:
|
|
if (evbuffer_strchr(&it, '\n') < 0)
|
|
goto done;
|
|
extra_drain = 1;
|
|
break;
|
|
case EVBUFFER_EOL_NUL:
|
|
if (evbuffer_strchr(&it, '\0') < 0)
|
|
goto done;
|
|
extra_drain = 1;
|
|
break;
|
|
default:
|
|
goto done;
|
|
}
|
|
|
|
ok = 1;
|
|
done:
|
|
EVBUFFER_UNLOCK(buffer);
|
|
|
|
if (!ok)
|
|
PTR_NOT_FOUND(&it);
|
|
if (eol_len_out)
|
|
*eol_len_out = extra_drain;
|
|
|
|
return it;
|
|
}
|
|
|
|
char *
|
|
evbuffer_readln(struct evbuffer *buffer, size_t *n_read_out,
|
|
enum evbuffer_eol_style eol_style)
|
|
{
|
|
struct evbuffer_ptr it;
|
|
char *line;
|
|
size_t n_to_copy=0, extra_drain=0;
|
|
char *result = NULL;
|
|
|
|
EVBUFFER_LOCK(buffer);
|
|
|
|
if (buffer->freeze_start) {
|
|
goto done;
|
|
}
|
|
|
|
it = evbuffer_search_eol(buffer, NULL, &extra_drain, eol_style);
|
|
if (it.pos < 0)
|
|
goto done;
|
|
n_to_copy = it.pos;
|
|
|
|
if ((line = mm_malloc(n_to_copy+1)) == NULL) {
|
|
event_warn("%s: out of memory", __func__);
|
|
goto done;
|
|
}
|
|
|
|
evbuffer_remove(buffer, line, n_to_copy);
|
|
line[n_to_copy] = '\0';
|
|
|
|
evbuffer_drain(buffer, extra_drain);
|
|
result = line;
|
|
done:
|
|
EVBUFFER_UNLOCK(buffer);
|
|
|
|
if (n_read_out)
|
|
*n_read_out = result ? n_to_copy : 0;
|
|
|
|
return result;
|
|
}
|
|
|
|
#define EVBUFFER_CHAIN_MAX_AUTO_SIZE 4096
|
|
|
|
/* Adds data to an event buffer */
|
|
|
|
int
|
|
evbuffer_add(struct evbuffer *buf, const void *data_in, size_t datlen)
|
|
{
|
|
struct evbuffer_chain *chain, *tmp;
|
|
const unsigned char *data = data_in;
|
|
size_t remain, to_alloc;
|
|
int result = -1;
|
|
|
|
EVBUFFER_LOCK(buf);
|
|
|
|
if (buf->freeze_end) {
|
|
goto done;
|
|
}
|
|
/* Prevent buf->total_len overflow */
|
|
if (datlen > EV_SIZE_MAX - buf->total_len) {
|
|
goto done;
|
|
}
|
|
|
|
chain = buf->last;
|
|
|
|
/* If there are no chains allocated for this buffer, allocate one
|
|
* big enough to hold all the data. */
|
|
if (chain == NULL) {
|
|
chain = evbuffer_chain_new(datlen);
|
|
if (!chain)
|
|
goto done;
|
|
evbuffer_chain_insert(buf, chain);
|
|
}
|
|
|
|
if ((chain->flags & EVBUFFER_IMMUTABLE) == 0) {
|
|
/* Always true for mutable buffers */
|
|
EVUTIL_ASSERT(chain->misalign >= 0 &&
|
|
(ev_uint64_t)chain->misalign <= EVBUFFER_CHAIN_MAX);
|
|
remain = chain->buffer_len - (size_t)chain->misalign - chain->off;
|
|
if (remain >= datlen) {
|
|
/* there's enough space to hold all the data in the
|
|
* current last chain */
|
|
memcpy(chain->buffer + chain->misalign + chain->off,
|
|
data, datlen);
|
|
chain->off += datlen;
|
|
buf->total_len += datlen;
|
|
buf->n_add_for_cb += datlen;
|
|
goto out;
|
|
} else if (!CHAIN_PINNED(chain) &&
|
|
evbuffer_chain_should_realign(chain, datlen)) {
|
|
/* we can fit the data into the misalignment */
|
|
evbuffer_chain_align(chain);
|
|
|
|
memcpy(chain->buffer + chain->off, data, datlen);
|
|
chain->off += datlen;
|
|
buf->total_len += datlen;
|
|
buf->n_add_for_cb += datlen;
|
|
goto out;
|
|
}
|
|
} else {
|
|
/* we cannot write any data to the last chain */
|
|
remain = 0;
|
|
}
|
|
|
|
/* we need to add another chain */
|
|
to_alloc = chain->buffer_len;
|
|
if (to_alloc <= EVBUFFER_CHAIN_MAX_AUTO_SIZE/2)
|
|
to_alloc <<= 1;
|
|
if (datlen > to_alloc)
|
|
to_alloc = datlen;
|
|
tmp = evbuffer_chain_new(to_alloc);
|
|
if (tmp == NULL)
|
|
goto done;
|
|
|
|
if (remain) {
|
|
memcpy(chain->buffer + chain->misalign + chain->off,
|
|
data, remain);
|
|
chain->off += remain;
|
|
buf->total_len += remain;
|
|
buf->n_add_for_cb += remain;
|
|
}
|
|
|
|
data += remain;
|
|
datlen -= remain;
|
|
|
|
memcpy(tmp->buffer, data, datlen);
|
|
tmp->off = datlen;
|
|
evbuffer_chain_insert(buf, tmp);
|
|
buf->n_add_for_cb += datlen;
|
|
|
|
out:
|
|
evbuffer_invoke_callbacks_(buf);
|
|
result = 0;
|
|
done:
|
|
EVBUFFER_UNLOCK(buf);
|
|
return result;
|
|
}
|
|
|
|
int
|
|
evbuffer_prepend(struct evbuffer *buf, const void *data, size_t datlen)
|
|
{
|
|
struct evbuffer_chain *chain, *tmp;
|
|
int result = -1;
|
|
|
|
EVBUFFER_LOCK(buf);
|
|
|
|
if (buf->freeze_start) {
|
|
goto done;
|
|
}
|
|
if (datlen > EV_SIZE_MAX - buf->total_len) {
|
|
goto done;
|
|
}
|
|
|
|
chain = buf->first;
|
|
|
|
if (chain == NULL) {
|
|
chain = evbuffer_chain_new(datlen);
|
|
if (!chain)
|
|
goto done;
|
|
evbuffer_chain_insert(buf, chain);
|
|
}
|
|
|
|
/* we cannot touch immutable buffers */
|
|
if ((chain->flags & EVBUFFER_IMMUTABLE) == 0) {
|
|
/* Always true for mutable buffers */
|
|
EVUTIL_ASSERT(chain->misalign >= 0 &&
|
|
(ev_uint64_t)chain->misalign <= EVBUFFER_CHAIN_MAX);
|
|
|
|
/* If this chain is empty, we can treat it as
|
|
* 'empty at the beginning' rather than 'empty at the end' */
|
|
if (chain->off == 0)
|
|
chain->misalign = chain->buffer_len;
|
|
|
|
if ((size_t)chain->misalign >= datlen) {
|
|
/* we have enough space to fit everything */
|
|
memcpy(chain->buffer + chain->misalign - datlen,
|
|
data, datlen);
|
|
chain->off += datlen;
|
|
chain->misalign -= datlen;
|
|
buf->total_len += datlen;
|
|
buf->n_add_for_cb += datlen;
|
|
goto out;
|
|
} else if (chain->misalign) {
|
|
/* we can only fit some of the data. */
|
|
memcpy(chain->buffer,
|
|
(char*)data + datlen - chain->misalign,
|
|
(size_t)chain->misalign);
|
|
chain->off += (size_t)chain->misalign;
|
|
buf->total_len += (size_t)chain->misalign;
|
|
buf->n_add_for_cb += (size_t)chain->misalign;
|
|
datlen -= (size_t)chain->misalign;
|
|
chain->misalign = 0;
|
|
}
|
|
}
|
|
|
|
/* we need to add another chain */
|
|
if ((tmp = evbuffer_chain_new(datlen)) == NULL)
|
|
goto done;
|
|
buf->first = tmp;
|
|
if (buf->last_with_datap == &buf->first)
|
|
buf->last_with_datap = &tmp->next;
|
|
|
|
tmp->next = chain;
|
|
|
|
tmp->off = datlen;
|
|
EVUTIL_ASSERT(datlen <= tmp->buffer_len);
|
|
tmp->misalign = tmp->buffer_len - datlen;
|
|
|
|
memcpy(tmp->buffer + tmp->misalign, data, datlen);
|
|
buf->total_len += datlen;
|
|
buf->n_add_for_cb += (size_t)chain->misalign;
|
|
|
|
out:
|
|
evbuffer_invoke_callbacks_(buf);
|
|
result = 0;
|
|
done:
|
|
EVBUFFER_UNLOCK(buf);
|
|
return result;
|
|
}
|
|
|
|
/** Helper: realigns the memory in chain->buffer so that misalign is 0. */
|
|
static void
|
|
evbuffer_chain_align(struct evbuffer_chain *chain)
|
|
{
|
|
EVUTIL_ASSERT(!(chain->flags & EVBUFFER_IMMUTABLE));
|
|
EVUTIL_ASSERT(!(chain->flags & EVBUFFER_MEM_PINNED_ANY));
|
|
memmove(chain->buffer, chain->buffer + chain->misalign, chain->off);
|
|
chain->misalign = 0;
|
|
}
|
|
|
|
#define MAX_TO_COPY_IN_EXPAND 4096
|
|
#define MAX_TO_REALIGN_IN_EXPAND 2048
|
|
|
|
/** Helper: return true iff we should realign chain to fit datalen bytes of
|
|
data in it. */
|
|
static int
|
|
evbuffer_chain_should_realign(struct evbuffer_chain *chain,
|
|
size_t datlen)
|
|
{
|
|
return chain->buffer_len - chain->off >= datlen &&
|
|
(chain->off < chain->buffer_len / 2) &&
|
|
(chain->off <= MAX_TO_REALIGN_IN_EXPAND);
|
|
}
|
|
|
|
/* Expands the available space in the event buffer to at least datlen, all in
|
|
* a single chunk. Return that chunk. */
|
|
static struct evbuffer_chain *
|
|
evbuffer_expand_singlechain(struct evbuffer *buf, size_t datlen)
|
|
{
|
|
struct evbuffer_chain *chain, **chainp;
|
|
struct evbuffer_chain *result = NULL;
|
|
ASSERT_EVBUFFER_LOCKED(buf);
|
|
|
|
chainp = buf->last_with_datap;
|
|
|
|
/* XXX If *chainp is no longer writeable, but has enough space in its
|
|
* misalign, this might be a bad idea: we could still use *chainp, not
|
|
* (*chainp)->next. */
|
|
if (*chainp && CHAIN_SPACE_LEN(*chainp) == 0)
|
|
chainp = &(*chainp)->next;
|
|
|
|
/* 'chain' now points to the first chain with writable space (if any)
|
|
* We will either use it, realign it, replace it, or resize it. */
|
|
chain = *chainp;
|
|
|
|
if (chain == NULL ||
|
|
(chain->flags & (EVBUFFER_IMMUTABLE|EVBUFFER_MEM_PINNED_ANY))) {
|
|
/* We can't use the last_with_data chain at all. Just add a
|
|
* new one that's big enough. */
|
|
goto insert_new;
|
|
}
|
|
|
|
/* If we can fit all the data, then we don't have to do anything */
|
|
if (CHAIN_SPACE_LEN(chain) >= datlen) {
|
|
result = chain;
|
|
goto ok;
|
|
}
|
|
|
|
/* If the chain is completely empty, just replace it by adding a new
|
|
* empty chain. */
|
|
if (chain->off == 0) {
|
|
goto insert_new;
|
|
}
|
|
|
|
/* If the misalignment plus the remaining space fulfills our data
|
|
* needs, we could just force an alignment to happen. Afterwards, we
|
|
* have enough space. But only do this if we're saving a lot of space
|
|
* and not moving too much data. Otherwise the space savings are
|
|
* probably offset by the time lost in copying.
|
|
*/
|
|
if (evbuffer_chain_should_realign(chain, datlen)) {
|
|
evbuffer_chain_align(chain);
|
|
result = chain;
|
|
goto ok;
|
|
}
|
|
|
|
/* At this point, we can either resize the last chunk with space in
|
|
* it, use the next chunk after it, or If we add a new chunk, we waste
|
|
* CHAIN_SPACE_LEN(chain) bytes in the former last chunk. If we
|
|
* resize, we have to copy chain->off bytes.
|
|
*/
|
|
|
|
/* Would expanding this chunk be affordable and worthwhile? */
|
|
if (CHAIN_SPACE_LEN(chain) < chain->buffer_len / 8 ||
|
|
chain->off > MAX_TO_COPY_IN_EXPAND ||
|
|
(datlen < EVBUFFER_CHAIN_MAX &&
|
|
EVBUFFER_CHAIN_MAX - datlen >= chain->off)) {
|
|
/* It's not worth resizing this chain. Can the next one be
|
|
* used? */
|
|
if (chain->next && CHAIN_SPACE_LEN(chain->next) >= datlen) {
|
|
/* Yes, we can just use the next chain (which should
|
|
* be empty. */
|
|
result = chain->next;
|
|
goto ok;
|
|
} else {
|
|
/* No; append a new chain (which will free all
|
|
* terminal empty chains.) */
|
|
goto insert_new;
|
|
}
|
|
} else {
|
|
/* Okay, we're going to try to resize this chain: Not doing so
|
|
* would waste at least 1/8 of its current allocation, and we
|
|
* can do so without having to copy more than
|
|
* MAX_TO_COPY_IN_EXPAND bytes. */
|
|
/* figure out how much space we need */
|
|
size_t length = chain->off + datlen;
|
|
struct evbuffer_chain *tmp = evbuffer_chain_new(length);
|
|
if (tmp == NULL)
|
|
goto err;
|
|
|
|
/* copy the data over that we had so far */
|
|
tmp->off = chain->off;
|
|
memcpy(tmp->buffer, chain->buffer + chain->misalign,
|
|
chain->off);
|
|
/* fix up the list */
|
|
EVUTIL_ASSERT(*chainp == chain);
|
|
result = *chainp = tmp;
|
|
|
|
if (buf->last == chain)
|
|
buf->last = tmp;
|
|
|
|
tmp->next = chain->next;
|
|
evbuffer_chain_free(chain);
|
|
goto ok;
|
|
}
|
|
|
|
insert_new:
|
|
result = evbuffer_chain_insert_new(buf, datlen);
|
|
if (!result)
|
|
goto err;
|
|
ok:
|
|
EVUTIL_ASSERT(result);
|
|
EVUTIL_ASSERT(CHAIN_SPACE_LEN(result) >= datlen);
|
|
err:
|
|
return result;
|
|
}
|
|
|
|
/* Make sure that datlen bytes are available for writing in the last n
|
|
* chains. Never copies or moves data. */
|
|
int
|
|
evbuffer_expand_fast_(struct evbuffer *buf, size_t datlen, int n)
|
|
{
|
|
struct evbuffer_chain *chain = buf->last, *tmp, *next;
|
|
size_t avail;
|
|
int used;
|
|
|
|
ASSERT_EVBUFFER_LOCKED(buf);
|
|
EVUTIL_ASSERT(n >= 2);
|
|
|
|
if (chain == NULL || (chain->flags & EVBUFFER_IMMUTABLE)) {
|
|
/* There is no last chunk, or we can't touch the last chunk.
|
|
* Just add a new chunk. */
|
|
chain = evbuffer_chain_new(datlen);
|
|
if (chain == NULL)
|
|
return (-1);
|
|
|
|
evbuffer_chain_insert(buf, chain);
|
|
return (0);
|
|
}
|
|
|
|
used = 0; /* number of chains we're using space in. */
|
|
avail = 0; /* how much space they have. */
|
|
/* How many bytes can we stick at the end of buffer as it is? Iterate
|
|
* over the chains at the end of the buffer, tring to see how much
|
|
* space we have in the first n. */
|
|
for (chain = *buf->last_with_datap; chain; chain = chain->next) {
|
|
if (chain->off) {
|
|
size_t space = (size_t) CHAIN_SPACE_LEN(chain);
|
|
EVUTIL_ASSERT(chain == *buf->last_with_datap);
|
|
if (space) {
|
|
avail += space;
|
|
++used;
|
|
}
|
|
} else {
|
|
/* No data in chain; realign it. */
|
|
chain->misalign = 0;
|
|
avail += chain->buffer_len;
|
|
++used;
|
|
}
|
|
if (avail >= datlen) {
|
|
/* There is already enough space. Just return */
|
|
return (0);
|
|
}
|
|
if (used == n)
|
|
break;
|
|
}
|
|
|
|
/* There wasn't enough space in the first n chains with space in
|
|
* them. Either add a new chain with enough space, or replace all
|
|
* empty chains with one that has enough space, depending on n. */
|
|
if (used < n) {
|
|
/* The loop ran off the end of the chains before it hit n
|
|
* chains; we can add another. */
|
|
EVUTIL_ASSERT(chain == NULL);
|
|
|
|
tmp = evbuffer_chain_new(datlen - avail);
|
|
if (tmp == NULL)
|
|
return (-1);
|
|
|
|
buf->last->next = tmp;
|
|
buf->last = tmp;
|
|
/* (we would only set last_with_data if we added the first
|
|
* chain. But if the buffer had no chains, we would have
|
|
* just allocated a new chain earlier) */
|
|
return (0);
|
|
} else {
|
|
/* Nuke _all_ the empty chains. */
|
|
int rmv_all = 0; /* True iff we removed last_with_data. */
|
|
chain = *buf->last_with_datap;
|
|
if (!chain->off) {
|
|
EVUTIL_ASSERT(chain == buf->first);
|
|
rmv_all = 1;
|
|
avail = 0;
|
|
} else {
|
|
/* can't overflow, since only mutable chains have
|
|
* huge misaligns. */
|
|
avail = (size_t) CHAIN_SPACE_LEN(chain);
|
|
chain = chain->next;
|
|
}
|
|
|
|
|
|
for (; chain; chain = next) {
|
|
next = chain->next;
|
|
EVUTIL_ASSERT(chain->off == 0);
|
|
evbuffer_chain_free(chain);
|
|
}
|
|
EVUTIL_ASSERT(datlen >= avail);
|
|
tmp = evbuffer_chain_new(datlen - avail);
|
|
if (tmp == NULL) {
|
|
if (rmv_all) {
|
|
ZERO_CHAIN(buf);
|
|
} else {
|
|
buf->last = *buf->last_with_datap;
|
|
(*buf->last_with_datap)->next = NULL;
|
|
}
|
|
return (-1);
|
|
}
|
|
|
|
if (rmv_all) {
|
|
buf->first = buf->last = tmp;
|
|
buf->last_with_datap = &buf->first;
|
|
} else {
|
|
(*buf->last_with_datap)->next = tmp;
|
|
buf->last = tmp;
|
|
}
|
|
return (0);
|
|
}
|
|
}
|
|
|
|
int
|
|
evbuffer_expand(struct evbuffer *buf, size_t datlen)
|
|
{
|
|
struct evbuffer_chain *chain;
|
|
|
|
EVBUFFER_LOCK(buf);
|
|
chain = evbuffer_expand_singlechain(buf, datlen);
|
|
EVBUFFER_UNLOCK(buf);
|
|
return chain ? 0 : -1;
|
|
}
|
|
|
|
/*
|
|
* Reads data from a file descriptor into a buffer.
|
|
*/
|
|
|
|
#if defined(EVENT__HAVE_SYS_UIO_H) || defined(_WIN32)
|
|
#define USE_IOVEC_IMPL
|
|
#endif
|
|
|
|
#ifdef USE_IOVEC_IMPL
|
|
|
|
#ifdef EVENT__HAVE_SYS_UIO_H
|
|
/* number of iovec we use for writev, fragmentation is going to determine
|
|
* how much we end up writing */
|
|
|
|
#define DEFAULT_WRITE_IOVEC 128
|
|
|
|
#if defined(UIO_MAXIOV) && UIO_MAXIOV < DEFAULT_WRITE_IOVEC
|
|
#define NUM_WRITE_IOVEC UIO_MAXIOV
|
|
#elif defined(IOV_MAX) && IOV_MAX < DEFAULT_WRITE_IOVEC
|
|
#define NUM_WRITE_IOVEC IOV_MAX
|
|
#else
|
|
#define NUM_WRITE_IOVEC DEFAULT_WRITE_IOVEC
|
|
#endif
|
|
|
|
#define IOV_TYPE struct iovec
|
|
#define IOV_PTR_FIELD iov_base
|
|
#define IOV_LEN_FIELD iov_len
|
|
#define IOV_LEN_TYPE size_t
|
|
#else
|
|
#define NUM_WRITE_IOVEC 16
|
|
#define IOV_TYPE WSABUF
|
|
#define IOV_PTR_FIELD buf
|
|
#define IOV_LEN_FIELD len
|
|
#define IOV_LEN_TYPE unsigned long
|
|
#endif
|
|
#endif
|
|
#define NUM_READ_IOVEC 4
|
|
|
|
#define EVBUFFER_MAX_READ 4096
|
|
|
|
/** Helper function to figure out which space to use for reading data into
|
|
an evbuffer. Internal use only.
|
|
|
|
@param buf The buffer to read into
|
|
@param howmuch How much we want to read.
|
|
@param vecs An array of two or more iovecs or WSABUFs.
|
|
@param n_vecs_avail The length of vecs
|
|
@param chainp A pointer to a variable to hold the first chain we're
|
|
reading into.
|
|
@param exact Boolean: if true, we do not provide more than 'howmuch'
|
|
space in the vectors, even if more space is available.
|
|
@return The number of buffers we're using.
|
|
*/
|
|
int
|
|
evbuffer_read_setup_vecs_(struct evbuffer *buf, ev_ssize_t howmuch,
|
|
struct evbuffer_iovec *vecs, int n_vecs_avail,
|
|
struct evbuffer_chain ***chainp, int exact)
|
|
{
|
|
struct evbuffer_chain *chain;
|
|
struct evbuffer_chain **firstchainp;
|
|
size_t so_far;
|
|
int i;
|
|
ASSERT_EVBUFFER_LOCKED(buf);
|
|
|
|
if (howmuch < 0)
|
|
return -1;
|
|
|
|
so_far = 0;
|
|
/* Let firstchain be the first chain with any space on it */
|
|
firstchainp = buf->last_with_datap;
|
|
if (CHAIN_SPACE_LEN(*firstchainp) == 0) {
|
|
firstchainp = &(*firstchainp)->next;
|
|
}
|
|
|
|
chain = *firstchainp;
|
|
for (i = 0; i < n_vecs_avail && so_far < (size_t)howmuch; ++i) {
|
|
size_t avail = (size_t) CHAIN_SPACE_LEN(chain);
|
|
if (avail > (howmuch - so_far) && exact)
|
|
avail = howmuch - so_far;
|
|
vecs[i].iov_base = CHAIN_SPACE_PTR(chain);
|
|
vecs[i].iov_len = avail;
|
|
so_far += avail;
|
|
chain = chain->next;
|
|
}
|
|
|
|
*chainp = firstchainp;
|
|
return i;
|
|
}
|
|
|
|
static int
|
|
get_n_bytes_readable_on_socket(evutil_socket_t fd)
|
|
{
|
|
#if defined(FIONREAD) && defined(_WIN32)
|
|
unsigned long lng = EVBUFFER_MAX_READ;
|
|
if (ioctlsocket(fd, FIONREAD, &lng) < 0)
|
|
return -1;
|
|
/* Can overflow, but mostly harmlessly. XXXX */
|
|
return (int)lng;
|
|
#elif defined(FIONREAD)
|
|
int n = EVBUFFER_MAX_READ;
|
|
if (ioctl(fd, FIONREAD, &n) < 0)
|
|
return -1;
|
|
return n;
|
|
#else
|
|
return EVBUFFER_MAX_READ;
|
|
#endif
|
|
}
|
|
|
|
/* TODO(niels): should this function return ev_ssize_t and take ev_ssize_t
|
|
* as howmuch? */
|
|
int
|
|
evbuffer_read(struct evbuffer *buf, evutil_socket_t fd, int howmuch)
|
|
{
|
|
struct evbuffer_chain **chainp;
|
|
int n;
|
|
int result;
|
|
|
|
#ifdef USE_IOVEC_IMPL
|
|
int nvecs, i, remaining;
|
|
#else
|
|
struct evbuffer_chain *chain;
|
|
unsigned char *p;
|
|
#endif
|
|
|
|
EVBUFFER_LOCK(buf);
|
|
|
|
if (buf->freeze_end) {
|
|
result = -1;
|
|
goto done;
|
|
}
|
|
|
|
n = get_n_bytes_readable_on_socket(fd);
|
|
if (n <= 0 || n > EVBUFFER_MAX_READ)
|
|
n = EVBUFFER_MAX_READ;
|
|
if (howmuch < 0 || howmuch > n)
|
|
howmuch = n;
|
|
|
|
#ifdef USE_IOVEC_IMPL
|
|
/* Since we can use iovecs, we're willing to use the last
|
|
* NUM_READ_IOVEC chains. */
|
|
if (evbuffer_expand_fast_(buf, howmuch, NUM_READ_IOVEC) == -1) {
|
|
result = -1;
|
|
goto done;
|
|
} else {
|
|
IOV_TYPE vecs[NUM_READ_IOVEC];
|
|
#ifdef EVBUFFER_IOVEC_IS_NATIVE_
|
|
nvecs = evbuffer_read_setup_vecs_(buf, howmuch, vecs,
|
|
NUM_READ_IOVEC, &chainp, 1);
|
|
#else
|
|
/* We aren't using the native struct iovec. Therefore,
|
|
we are on win32. */
|
|
struct evbuffer_iovec ev_vecs[NUM_READ_IOVEC];
|
|
nvecs = evbuffer_read_setup_vecs_(buf, howmuch, ev_vecs, 2,
|
|
&chainp, 1);
|
|
|
|
for (i=0; i < nvecs; ++i)
|
|
WSABUF_FROM_EVBUFFER_IOV(&vecs[i], &ev_vecs[i]);
|
|
#endif
|
|
|
|
#ifdef _WIN32
|
|
{
|
|
DWORD bytesRead;
|
|
DWORD flags=0;
|
|
if (WSARecv(fd, vecs, nvecs, &bytesRead, &flags, NULL, NULL)) {
|
|
/* The read failed. It might be a close,
|
|
* or it might be an error. */
|
|
if (WSAGetLastError() == WSAECONNABORTED)
|
|
n = 0;
|
|
else
|
|
n = -1;
|
|
} else
|
|
n = bytesRead;
|
|
}
|
|
#else
|
|
n = readv(fd, vecs, nvecs);
|
|
#endif
|
|
}
|
|
|
|
#else /*!USE_IOVEC_IMPL*/
|
|
/* If we don't have FIONREAD, we might waste some space here */
|
|
/* XXX we _will_ waste some space here if there is any space left
|
|
* over on buf->last. */
|
|
if ((chain = evbuffer_expand_singlechain(buf, howmuch)) == NULL) {
|
|
result = -1;
|
|
goto done;
|
|
}
|
|
|
|
/* We can append new data at this point */
|
|
p = chain->buffer + chain->misalign + chain->off;
|
|
|
|
#ifndef _WIN32
|
|
n = read(fd, p, howmuch);
|
|
#else
|
|
n = recv(fd, p, howmuch, 0);
|
|
#endif
|
|
#endif /* USE_IOVEC_IMPL */
|
|
|
|
if (n == -1) {
|
|
result = -1;
|
|
goto done;
|
|
}
|
|
if (n == 0) {
|
|
result = 0;
|
|
goto done;
|
|
}
|
|
|
|
#ifdef USE_IOVEC_IMPL
|
|
remaining = n;
|
|
for (i=0; i < nvecs; ++i) {
|
|
/* can't overflow, since only mutable chains have
|
|
* huge misaligns. */
|
|
size_t space = (size_t) CHAIN_SPACE_LEN(*chainp);
|
|
/* XXXX This is a kludge that can waste space in perverse
|
|
* situations. */
|
|
if (space > EVBUFFER_CHAIN_MAX)
|
|
space = EVBUFFER_CHAIN_MAX;
|
|
if ((ev_ssize_t)space < remaining) {
|
|
(*chainp)->off += space;
|
|
remaining -= (int)space;
|
|
} else {
|
|
(*chainp)->off += remaining;
|
|
buf->last_with_datap = chainp;
|
|
break;
|
|
}
|
|
chainp = &(*chainp)->next;
|
|
}
|
|
#else
|
|
chain->off += n;
|
|
advance_last_with_data(buf);
|
|
#endif
|
|
buf->total_len += n;
|
|
buf->n_add_for_cb += n;
|
|
|
|
/* Tell someone about changes in this buffer */
|
|
evbuffer_invoke_callbacks_(buf);
|
|
result = n;
|
|
done:
|
|
EVBUFFER_UNLOCK(buf);
|
|
return result;
|
|
}
|
|
|
|
#ifdef USE_IOVEC_IMPL
|
|
static inline int
|
|
evbuffer_write_iovec(struct evbuffer *buffer, evutil_socket_t fd,
|
|
ev_ssize_t howmuch)
|
|
{
|
|
IOV_TYPE iov[NUM_WRITE_IOVEC];
|
|
struct evbuffer_chain *chain = buffer->first;
|
|
int n, i = 0;
|
|
|
|
if (howmuch < 0)
|
|
return -1;
|
|
|
|
ASSERT_EVBUFFER_LOCKED(buffer);
|
|
/* XXX make this top out at some maximal data length? if the
|
|
* buffer has (say) 1MB in it, split over 128 chains, there's
|
|
* no way it all gets written in one go. */
|
|
while (chain != NULL && i < NUM_WRITE_IOVEC && howmuch) {
|
|
#ifdef USE_SENDFILE
|
|
/* we cannot write the file info via writev */
|
|
if (chain->flags & EVBUFFER_SENDFILE)
|
|
break;
|
|
#endif
|
|
iov[i].IOV_PTR_FIELD = (void *) (chain->buffer + chain->misalign);
|
|
if ((size_t)howmuch >= chain->off) {
|
|
/* XXXcould be problematic when windows supports mmap*/
|
|
iov[i++].IOV_LEN_FIELD = (IOV_LEN_TYPE)chain->off;
|
|
howmuch -= chain->off;
|
|
} else {
|
|
/* XXXcould be problematic when windows supports mmap*/
|
|
iov[i++].IOV_LEN_FIELD = (IOV_LEN_TYPE)howmuch;
|
|
break;
|
|
}
|
|
chain = chain->next;
|
|
}
|
|
if (! i)
|
|
return 0;
|
|
|
|
#ifdef _WIN32
|
|
{
|
|
DWORD bytesSent;
|
|
if (WSASend(fd, iov, i, &bytesSent, 0, NULL, NULL))
|
|
n = -1;
|
|
else
|
|
n = bytesSent;
|
|
}
|
|
#else
|
|
n = writev(fd, iov, i);
|
|
#endif
|
|
return (n);
|
|
}
|
|
#endif
|
|
|
|
#ifdef USE_SENDFILE
|
|
static inline int
|
|
evbuffer_write_sendfile(struct evbuffer *buffer, evutil_socket_t dest_fd,
|
|
ev_ssize_t howmuch)
|
|
{
|
|
struct evbuffer_chain *chain = buffer->first;
|
|
struct evbuffer_chain_file_segment *info =
|
|
EVBUFFER_CHAIN_EXTRA(struct evbuffer_chain_file_segment,
|
|
chain);
|
|
const int source_fd = info->segment->fd;
|
|
#if defined(SENDFILE_IS_MACOSX) || defined(SENDFILE_IS_FREEBSD)
|
|
int res;
|
|
ev_off_t len = chain->off;
|
|
#elif defined(SENDFILE_IS_LINUX) || defined(SENDFILE_IS_SOLARIS)
|
|
ev_ssize_t res;
|
|
ev_off_t offset = chain->misalign;
|
|
#endif
|
|
|
|
ASSERT_EVBUFFER_LOCKED(buffer);
|
|
|
|
#if defined(SENDFILE_IS_MACOSX)
|
|
res = sendfile(source_fd, dest_fd, chain->misalign, &len, NULL, 0);
|
|
if (res == -1 && !EVUTIL_ERR_RW_RETRIABLE(errno))
|
|
return (-1);
|
|
|
|
return (len);
|
|
#elif defined(SENDFILE_IS_FREEBSD)
|
|
res = sendfile(source_fd, dest_fd, chain->misalign, chain->off, NULL, &len, 0);
|
|
if (res == -1 && !EVUTIL_ERR_RW_RETRIABLE(errno))
|
|
return (-1);
|
|
|
|
return (len);
|
|
#elif defined(SENDFILE_IS_LINUX)
|
|
/* TODO(niels): implement splice */
|
|
res = sendfile(dest_fd, source_fd, &offset, chain->off);
|
|
if (res == -1 && EVUTIL_ERR_RW_RETRIABLE(errno)) {
|
|
/* if this is EAGAIN or EINTR return 0; otherwise, -1 */
|
|
return (0);
|
|
}
|
|
return (res);
|
|
#elif defined(SENDFILE_IS_SOLARIS)
|
|
{
|
|
const off_t offset_orig = offset;
|
|
res = sendfile(dest_fd, source_fd, &offset, chain->off);
|
|
if (res == -1 && EVUTIL_ERR_RW_RETRIABLE(errno)) {
|
|
if (offset - offset_orig)
|
|
return offset - offset_orig;
|
|
/* if this is EAGAIN or EINTR and no bytes were
|
|
* written, return 0 */
|
|
return (0);
|
|
}
|
|
return (res);
|
|
}
|
|
#endif
|
|
}
|
|
#endif
|
|
|
|
int
|
|
evbuffer_write_atmost(struct evbuffer *buffer, evutil_socket_t fd,
|
|
ev_ssize_t howmuch)
|
|
{
|
|
int n = -1;
|
|
|
|
EVBUFFER_LOCK(buffer);
|
|
|
|
if (buffer->freeze_start) {
|
|
goto done;
|
|
}
|
|
|
|
if (howmuch < 0 || (size_t)howmuch > buffer->total_len)
|
|
howmuch = buffer->total_len;
|
|
|
|
if (howmuch > 0) {
|
|
#ifdef USE_SENDFILE
|
|
struct evbuffer_chain *chain = buffer->first;
|
|
if (chain != NULL && (chain->flags & EVBUFFER_SENDFILE))
|
|
n = evbuffer_write_sendfile(buffer, fd, howmuch);
|
|
else {
|
|
#endif
|
|
#ifdef USE_IOVEC_IMPL
|
|
n = evbuffer_write_iovec(buffer, fd, howmuch);
|
|
#elif defined(_WIN32)
|
|
/* XXX(nickm) Don't disable this code until we know if
|
|
* the WSARecv code above works. */
|
|
void *p = evbuffer_pullup(buffer, howmuch);
|
|
EVUTIL_ASSERT(p || !howmuch);
|
|
n = send(fd, p, howmuch, 0);
|
|
#else
|
|
void *p = evbuffer_pullup(buffer, howmuch);
|
|
EVUTIL_ASSERT(p || !howmuch);
|
|
n = write(fd, p, howmuch);
|
|
#endif
|
|
#ifdef USE_SENDFILE
|
|
}
|
|
#endif
|
|
}
|
|
|
|
if (n > 0)
|
|
evbuffer_drain(buffer, n);
|
|
|
|
done:
|
|
EVBUFFER_UNLOCK(buffer);
|
|
return (n);
|
|
}
|
|
|
|
int
|
|
evbuffer_write(struct evbuffer *buffer, evutil_socket_t fd)
|
|
{
|
|
return evbuffer_write_atmost(buffer, fd, -1);
|
|
}
|
|
|
|
unsigned char *
|
|
evbuffer_find(struct evbuffer *buffer, const unsigned char *what, size_t len)
|
|
{
|
|
unsigned char *search;
|
|
struct evbuffer_ptr ptr;
|
|
|
|
EVBUFFER_LOCK(buffer);
|
|
|
|
ptr = evbuffer_search(buffer, (const char *)what, len, NULL);
|
|
if (ptr.pos < 0) {
|
|
search = NULL;
|
|
} else {
|
|
search = evbuffer_pullup(buffer, ptr.pos + len);
|
|
if (search)
|
|
search += ptr.pos;
|
|
}
|
|
EVBUFFER_UNLOCK(buffer);
|
|
return search;
|
|
}
|
|
|
|
/* Subract <b>howfar</b> from the position of <b>pos</b> within
|
|
* <b>buf</b>. Returns 0 on success, -1 on failure.
|
|
*
|
|
* This isn't exposed yet, because of potential inefficiency issues.
|
|
* Maybe it should be. */
|
|
static int
|
|
evbuffer_ptr_subtract(struct evbuffer *buf, struct evbuffer_ptr *pos,
|
|
size_t howfar)
|
|
{
|
|
if (pos->pos < 0)
|
|
return -1;
|
|
if (howfar > (size_t)pos->pos)
|
|
return -1;
|
|
if (pos->internal_.chain && howfar <= pos->internal_.pos_in_chain) {
|
|
pos->internal_.pos_in_chain -= howfar;
|
|
pos->pos -= howfar;
|
|
return 0;
|
|
} else {
|
|
const size_t newpos = pos->pos - howfar;
|
|
/* Here's the inefficient part: it walks over the
|
|
* chains until we hit newpos. */
|
|
return evbuffer_ptr_set(buf, pos, newpos, EVBUFFER_PTR_SET);
|
|
}
|
|
}
|
|
|
|
int
|
|
evbuffer_ptr_set(struct evbuffer *buf, struct evbuffer_ptr *pos,
|
|
size_t position, enum evbuffer_ptr_how how)
|
|
{
|
|
size_t left = position;
|
|
struct evbuffer_chain *chain = NULL;
|
|
int result = 0;
|
|
|
|
EVBUFFER_LOCK(buf);
|
|
|
|
switch (how) {
|
|
case EVBUFFER_PTR_SET:
|
|
chain = buf->first;
|
|
pos->pos = position;
|
|
position = 0;
|
|
break;
|
|
case EVBUFFER_PTR_ADD:
|
|
/* this avoids iterating over all previous chains if
|
|
we just want to advance the position */
|
|
if (pos->pos < 0 || EV_SIZE_MAX - position < (size_t)pos->pos) {
|
|
EVBUFFER_UNLOCK(buf);
|
|
return -1;
|
|
}
|
|
chain = pos->internal_.chain;
|
|
pos->pos += position;
|
|
position = pos->internal_.pos_in_chain;
|
|
break;
|
|
}
|
|
|
|
EVUTIL_ASSERT(EV_SIZE_MAX - left >= position);
|
|
while (chain && position + left >= chain->off) {
|
|
left -= chain->off - position;
|
|
chain = chain->next;
|
|
position = 0;
|
|
}
|
|
if (chain) {
|
|
pos->internal_.chain = chain;
|
|
pos->internal_.pos_in_chain = position + left;
|
|
} else if (left == 0) {
|
|
/* The first byte in the (nonexistent) chain after the last chain */
|
|
pos->internal_.chain = NULL;
|
|
pos->internal_.pos_in_chain = 0;
|
|
} else {
|
|
PTR_NOT_FOUND(pos);
|
|
result = -1;
|
|
}
|
|
|
|
EVBUFFER_UNLOCK(buf);
|
|
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
Compare the bytes in buf at position pos to the len bytes in mem. Return
|
|
less than 0, 0, or greater than 0 as memcmp.
|
|
*/
|
|
static int
|
|
evbuffer_ptr_memcmp(const struct evbuffer *buf, const struct evbuffer_ptr *pos,
|
|
const char *mem, size_t len)
|
|
{
|
|
struct evbuffer_chain *chain;
|
|
size_t position;
|
|
int r;
|
|
|
|
ASSERT_EVBUFFER_LOCKED(buf);
|
|
|
|
if (pos->pos < 0 ||
|
|
EV_SIZE_MAX - len < (size_t)pos->pos ||
|
|
pos->pos + len > buf->total_len)
|
|
return -1;
|
|
|
|
chain = pos->internal_.chain;
|
|
position = pos->internal_.pos_in_chain;
|
|
while (len && chain) {
|
|
size_t n_comparable;
|
|
if (len + position > chain->off)
|
|
n_comparable = chain->off - position;
|
|
else
|
|
n_comparable = len;
|
|
r = memcmp(chain->buffer + chain->misalign + position, mem,
|
|
n_comparable);
|
|
if (r)
|
|
return r;
|
|
mem += n_comparable;
|
|
len -= n_comparable;
|
|
position = 0;
|
|
chain = chain->next;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
struct evbuffer_ptr
|
|
evbuffer_search(struct evbuffer *buffer, const char *what, size_t len, const struct evbuffer_ptr *start)
|
|
{
|
|
return evbuffer_search_range(buffer, what, len, start, NULL);
|
|
}
|
|
|
|
struct evbuffer_ptr
|
|
evbuffer_search_range(struct evbuffer *buffer, const char *what, size_t len, const struct evbuffer_ptr *start, const struct evbuffer_ptr *end)
|
|
{
|
|
struct evbuffer_ptr pos;
|
|
struct evbuffer_chain *chain, *last_chain = NULL;
|
|
const unsigned char *p;
|
|
char first;
|
|
|
|
EVBUFFER_LOCK(buffer);
|
|
|
|
if (start) {
|
|
memcpy(&pos, start, sizeof(pos));
|
|
chain = pos.internal_.chain;
|
|
} else {
|
|
pos.pos = 0;
|
|
chain = pos.internal_.chain = buffer->first;
|
|
pos.internal_.pos_in_chain = 0;
|
|
}
|
|
|
|
if (end)
|
|
last_chain = end->internal_.chain;
|
|
|
|
if (!len || len > EV_SSIZE_MAX)
|
|
goto done;
|
|
|
|
first = what[0];
|
|
|
|
while (chain) {
|
|
const unsigned char *start_at =
|
|
chain->buffer + chain->misalign +
|
|
pos.internal_.pos_in_chain;
|
|
p = memchr(start_at, first,
|
|
chain->off - pos.internal_.pos_in_chain);
|
|
if (p) {
|
|
pos.pos += p - start_at;
|
|
pos.internal_.pos_in_chain += p - start_at;
|
|
if (!evbuffer_ptr_memcmp(buffer, &pos, what, len)) {
|
|
if (end && pos.pos + (ev_ssize_t)len > end->pos)
|
|
goto not_found;
|
|
else
|
|
goto done;
|
|
}
|
|
++pos.pos;
|
|
++pos.internal_.pos_in_chain;
|
|
if (pos.internal_.pos_in_chain == chain->off) {
|
|
chain = pos.internal_.chain = chain->next;
|
|
pos.internal_.pos_in_chain = 0;
|
|
}
|
|
} else {
|
|
if (chain == last_chain)
|
|
goto not_found;
|
|
pos.pos += chain->off - pos.internal_.pos_in_chain;
|
|
chain = pos.internal_.chain = chain->next;
|
|
pos.internal_.pos_in_chain = 0;
|
|
}
|
|
}
|
|
|
|
not_found:
|
|
PTR_NOT_FOUND(&pos);
|
|
done:
|
|
EVBUFFER_UNLOCK(buffer);
|
|
return pos;
|
|
}
|
|
|
|
int
|
|
evbuffer_peek(struct evbuffer *buffer, ev_ssize_t len,
|
|
struct evbuffer_ptr *start_at,
|
|
struct evbuffer_iovec *vec, int n_vec)
|
|
{
|
|
struct evbuffer_chain *chain;
|
|
int idx = 0;
|
|
ev_ssize_t len_so_far = 0;
|
|
|
|
/* Avoid locking in trivial edge cases */
|
|
if (start_at && start_at->internal_.chain == NULL)
|
|
return 0;
|
|
|
|
EVBUFFER_LOCK(buffer);
|
|
|
|
if (start_at) {
|
|
chain = start_at->internal_.chain;
|
|
len_so_far = chain->off
|
|
- start_at->internal_.pos_in_chain;
|
|
idx = 1;
|
|
if (n_vec > 0) {
|
|
vec[0].iov_base = chain->buffer + chain->misalign
|
|
+ start_at->internal_.pos_in_chain;
|
|
vec[0].iov_len = len_so_far;
|
|
}
|
|
chain = chain->next;
|
|
} else {
|
|
chain = buffer->first;
|
|
}
|
|
|
|
if (n_vec == 0 && len < 0) {
|
|
/* If no vectors are provided and they asked for "everything",
|
|
* pretend they asked for the actual available amount. */
|
|
len = buffer->total_len;
|
|
if (start_at) {
|
|
len -= start_at->pos;
|
|
}
|
|
}
|
|
|
|
while (chain) {
|
|
if (len >= 0 && len_so_far >= len)
|
|
break;
|
|
if (idx<n_vec) {
|
|
vec[idx].iov_base = chain->buffer + chain->misalign;
|
|
vec[idx].iov_len = chain->off;
|
|
} else if (len<0) {
|
|
break;
|
|
}
|
|
++idx;
|
|
len_so_far += chain->off;
|
|
chain = chain->next;
|
|
}
|
|
|
|
EVBUFFER_UNLOCK(buffer);
|
|
|
|
return idx;
|
|
}
|
|
|
|
|
|
int
|
|
evbuffer_add_vprintf(struct evbuffer *buf, const char *fmt, va_list ap)
|
|
{
|
|
char *buffer;
|
|
size_t space;
|
|
int sz, result = -1;
|
|
va_list aq;
|
|
struct evbuffer_chain *chain;
|
|
|
|
|
|
EVBUFFER_LOCK(buf);
|
|
|
|
if (buf->freeze_end) {
|
|
goto done;
|
|
}
|
|
|
|
/* make sure that at least some space is available */
|
|
if ((chain = evbuffer_expand_singlechain(buf, 64)) == NULL)
|
|
goto done;
|
|
|
|
for (;;) {
|
|
#if 0
|
|
size_t used = chain->misalign + chain->off;
|
|
buffer = (char *)chain->buffer + chain->misalign + chain->off;
|
|
EVUTIL_ASSERT(chain->buffer_len >= used);
|
|
space = chain->buffer_len - used;
|
|
#endif
|
|
buffer = (char*) CHAIN_SPACE_PTR(chain);
|
|
space = (size_t) CHAIN_SPACE_LEN(chain);
|
|
|
|
#ifndef va_copy
|
|
#define va_copy(dst, src) memcpy(&(dst), &(src), sizeof(va_list))
|
|
#endif
|
|
va_copy(aq, ap);
|
|
|
|
sz = evutil_vsnprintf(buffer, space, fmt, aq);
|
|
|
|
va_end(aq);
|
|
|
|
if (sz < 0)
|
|
goto done;
|
|
if (INT_MAX >= EVBUFFER_CHAIN_MAX &&
|
|
(size_t)sz >= EVBUFFER_CHAIN_MAX)
|
|
goto done;
|
|
if ((size_t)sz < space) {
|
|
chain->off += sz;
|
|
buf->total_len += sz;
|
|
buf->n_add_for_cb += sz;
|
|
|
|
advance_last_with_data(buf);
|
|
evbuffer_invoke_callbacks_(buf);
|
|
result = sz;
|
|
goto done;
|
|
}
|
|
if ((chain = evbuffer_expand_singlechain(buf, sz + 1)) == NULL)
|
|
goto done;
|
|
}
|
|
/* NOTREACHED */
|
|
|
|
done:
|
|
EVBUFFER_UNLOCK(buf);
|
|
return result;
|
|
}
|
|
|
|
int
|
|
evbuffer_add_printf(struct evbuffer *buf, const char *fmt, ...)
|
|
{
|
|
int res = -1;
|
|
va_list ap;
|
|
|
|
va_start(ap, fmt);
|
|
res = evbuffer_add_vprintf(buf, fmt, ap);
|
|
va_end(ap);
|
|
|
|
return (res);
|
|
}
|
|
|
|
int
|
|
evbuffer_add_reference(struct evbuffer *outbuf,
|
|
const void *data, size_t datlen,
|
|
evbuffer_ref_cleanup_cb cleanupfn, void *extra)
|
|
{
|
|
struct evbuffer_chain *chain;
|
|
struct evbuffer_chain_reference *info;
|
|
int result = -1;
|
|
|
|
chain = evbuffer_chain_new(sizeof(struct evbuffer_chain_reference));
|
|
if (!chain)
|
|
return (-1);
|
|
chain->flags |= EVBUFFER_REFERENCE | EVBUFFER_IMMUTABLE;
|
|
chain->buffer = (u_char *)data;
|
|
chain->buffer_len = datlen;
|
|
chain->off = datlen;
|
|
|
|
info = EVBUFFER_CHAIN_EXTRA(struct evbuffer_chain_reference, chain);
|
|
info->cleanupfn = cleanupfn;
|
|
info->extra = extra;
|
|
|
|
EVBUFFER_LOCK(outbuf);
|
|
if (outbuf->freeze_end) {
|
|
/* don't call chain_free; we do not want to actually invoke
|
|
* the cleanup function */
|
|
mm_free(chain);
|
|
goto done;
|
|
}
|
|
evbuffer_chain_insert(outbuf, chain);
|
|
outbuf->n_add_for_cb += datlen;
|
|
|
|
evbuffer_invoke_callbacks_(outbuf);
|
|
|
|
result = 0;
|
|
done:
|
|
EVBUFFER_UNLOCK(outbuf);
|
|
|
|
return result;
|
|
}
|
|
|
|
/* TODO(niels): we may want to add to automagically convert to mmap, in
|
|
* case evbuffer_remove() or evbuffer_pullup() are being used.
|
|
*/
|
|
struct evbuffer_file_segment *
|
|
evbuffer_file_segment_new(
|
|
int fd, ev_off_t offset, ev_off_t length, unsigned flags)
|
|
{
|
|
struct evbuffer_file_segment *seg =
|
|
mm_calloc(sizeof(struct evbuffer_file_segment), 1);
|
|
if (!seg)
|
|
return NULL;
|
|
seg->refcnt = 1;
|
|
seg->fd = fd;
|
|
seg->flags = flags;
|
|
seg->file_offset = offset;
|
|
seg->cleanup_cb = NULL;
|
|
seg->cleanup_cb_arg = NULL;
|
|
#ifdef _WIN32
|
|
#ifndef lseek
|
|
#define lseek _lseeki64
|
|
#endif
|
|
#ifndef fstat
|
|
#define fstat _fstat
|
|
#endif
|
|
#ifndef stat
|
|
#define stat _stat
|
|
#endif
|
|
#endif
|
|
if (length == -1) {
|
|
struct stat st;
|
|
if (fstat(fd, &st) < 0)
|
|
goto err;
|
|
length = st.st_size;
|
|
}
|
|
seg->length = length;
|
|
|
|
if (offset < 0 || length < 0 ||
|
|
((ev_uint64_t)length > EVBUFFER_CHAIN_MAX) ||
|
|
(ev_uint64_t)offset > (ev_uint64_t)(EVBUFFER_CHAIN_MAX - length))
|
|
goto err;
|
|
|
|
#if defined(USE_SENDFILE)
|
|
if (!(flags & EVBUF_FS_DISABLE_SENDFILE)) {
|
|
seg->can_sendfile = 1;
|
|
goto done;
|
|
}
|
|
#endif
|
|
|
|
if (evbuffer_file_segment_materialize(seg)<0)
|
|
goto err;
|
|
|
|
#if defined(USE_SENDFILE)
|
|
done:
|
|
#endif
|
|
if (!(flags & EVBUF_FS_DISABLE_LOCKING)) {
|
|
EVTHREAD_ALLOC_LOCK(seg->lock, 0);
|
|
}
|
|
return seg;
|
|
err:
|
|
mm_free(seg);
|
|
return NULL;
|
|
}
|
|
|
|
#ifdef EVENT__HAVE_MMAP
|
|
static long
|
|
get_page_size(void)
|
|
{
|
|
#ifdef SC_PAGE_SIZE
|
|
return sysconf(SC_PAGE_SIZE);
|
|
#elif defined(_SC_PAGE_SIZE)
|
|
return sysconf(_SC_PAGE_SIZE);
|
|
#else
|
|
return 1;
|
|
#endif
|
|
}
|
|
#endif
|
|
|
|
/* DOCDOC */
|
|
/* Requires lock */
|
|
static int
|
|
evbuffer_file_segment_materialize(struct evbuffer_file_segment *seg)
|
|
{
|
|
const unsigned flags = seg->flags;
|
|
const int fd = seg->fd;
|
|
const ev_off_t length = seg->length;
|
|
const ev_off_t offset = seg->file_offset;
|
|
|
|
if (seg->contents)
|
|
return 0; /* already materialized */
|
|
|
|
#if defined(EVENT__HAVE_MMAP)
|
|
if (!(flags & EVBUF_FS_DISABLE_MMAP)) {
|
|
off_t offset_rounded = 0, offset_leftover = 0;
|
|
void *mapped;
|
|
if (offset) {
|
|
/* mmap implementations don't generally like us
|
|
* to have an offset that isn't a round */
|
|
long page_size = get_page_size();
|
|
if (page_size == -1)
|
|
goto err;
|
|
offset_leftover = offset % page_size;
|
|
offset_rounded = offset - offset_leftover;
|
|
}
|
|
mapped = mmap(NULL, length + offset_leftover,
|
|
PROT_READ,
|
|
#ifdef MAP_NOCACHE
|
|
MAP_NOCACHE | /* ??? */
|
|
#endif
|
|
#ifdef MAP_FILE
|
|
MAP_FILE |
|
|
#endif
|
|
MAP_PRIVATE,
|
|
fd, offset_rounded);
|
|
if (mapped == MAP_FAILED) {
|
|
event_warn("%s: mmap(%d, %d, %zu) failed",
|
|
__func__, fd, 0, (size_t)(offset + length));
|
|
} else {
|
|
seg->mapping = mapped;
|
|
seg->contents = (char*)mapped+offset_leftover;
|
|
seg->mmap_offset = 0;
|
|
seg->is_mapping = 1;
|
|
goto done;
|
|
}
|
|
}
|
|
#endif
|
|
#ifdef _WIN32
|
|
if (!(flags & EVBUF_FS_DISABLE_MMAP)) {
|
|
intptr_t h = _get_osfhandle(fd);
|
|
HANDLE m;
|
|
ev_uint64_t total_size = length+offset;
|
|
if ((HANDLE)h == INVALID_HANDLE_VALUE)
|
|
goto err;
|
|
m = CreateFileMapping((HANDLE)h, NULL, PAGE_READONLY,
|
|
(total_size >> 32), total_size & 0xfffffffful,
|
|
NULL);
|
|
if (m != INVALID_HANDLE_VALUE) { /* Does h leak? */
|
|
seg->mapping_handle = m;
|
|
seg->mmap_offset = offset;
|
|
seg->is_mapping = 1;
|
|
goto done;
|
|
}
|
|
}
|
|
#endif
|
|
{
|
|
ev_off_t start_pos = lseek(fd, 0, SEEK_CUR), pos;
|
|
ev_off_t read_so_far = 0;
|
|
char *mem;
|
|
int e;
|
|
ev_ssize_t n = 0;
|
|
if (!(mem = mm_malloc(length)))
|
|
goto err;
|
|
if (start_pos < 0) {
|
|
mm_free(mem);
|
|
goto err;
|
|
}
|
|
if (lseek(fd, offset, SEEK_SET) < 0) {
|
|
mm_free(mem);
|
|
goto err;
|
|
}
|
|
while (read_so_far < length) {
|
|
n = read(fd, mem+read_so_far, length-read_so_far);
|
|
if (n <= 0)
|
|
break;
|
|
read_so_far += n;
|
|
}
|
|
|
|
e = errno;
|
|
pos = lseek(fd, start_pos, SEEK_SET);
|
|
if (n < 0 || (n == 0 && length > read_so_far)) {
|
|
mm_free(mem);
|
|
errno = e;
|
|
goto err;
|
|
} else if (pos < 0) {
|
|
mm_free(mem);
|
|
goto err;
|
|
}
|
|
|
|
seg->contents = mem;
|
|
}
|
|
|
|
done:
|
|
return 0;
|
|
err:
|
|
return -1;
|
|
}
|
|
|
|
void evbuffer_file_segment_add_cleanup_cb(struct evbuffer_file_segment *seg,
|
|
evbuffer_file_segment_cleanup_cb cb, void* arg)
|
|
{
|
|
EVUTIL_ASSERT(seg->refcnt > 0);
|
|
seg->cleanup_cb = cb;
|
|
seg->cleanup_cb_arg = arg;
|
|
}
|
|
|
|
void
|
|
evbuffer_file_segment_free(struct evbuffer_file_segment *seg)
|
|
{
|
|
int refcnt;
|
|
EVLOCK_LOCK(seg->lock, 0);
|
|
refcnt = --seg->refcnt;
|
|
EVLOCK_UNLOCK(seg->lock, 0);
|
|
if (refcnt > 0)
|
|
return;
|
|
EVUTIL_ASSERT(refcnt == 0);
|
|
|
|
if (seg->is_mapping) {
|
|
#ifdef _WIN32
|
|
CloseHandle(seg->mapping_handle);
|
|
#elif defined (EVENT__HAVE_MMAP)
|
|
off_t offset_leftover;
|
|
offset_leftover = seg->file_offset % get_page_size();
|
|
if (munmap(seg->mapping, seg->length + offset_leftover) == -1)
|
|
event_warn("%s: munmap failed", __func__);
|
|
#endif
|
|
} else if (seg->contents) {
|
|
mm_free(seg->contents);
|
|
}
|
|
|
|
if ((seg->flags & EVBUF_FS_CLOSE_ON_FREE) && seg->fd >= 0) {
|
|
close(seg->fd);
|
|
}
|
|
|
|
if (seg->cleanup_cb) {
|
|
(*seg->cleanup_cb)((struct evbuffer_file_segment const*)seg,
|
|
seg->flags, seg->cleanup_cb_arg);
|
|
seg->cleanup_cb = NULL;
|
|
seg->cleanup_cb_arg = NULL;
|
|
}
|
|
|
|
EVTHREAD_FREE_LOCK(seg->lock, 0);
|
|
mm_free(seg);
|
|
}
|
|
|
|
int
|
|
evbuffer_add_file_segment(struct evbuffer *buf,
|
|
struct evbuffer_file_segment *seg, ev_off_t offset, ev_off_t length)
|
|
{
|
|
struct evbuffer_chain *chain;
|
|
struct evbuffer_chain_file_segment *extra;
|
|
int can_use_sendfile = 0;
|
|
|
|
EVBUFFER_LOCK(buf);
|
|
EVLOCK_LOCK(seg->lock, 0);
|
|
if (buf->flags & EVBUFFER_FLAG_DRAINS_TO_FD) {
|
|
can_use_sendfile = 1;
|
|
} else {
|
|
if (!seg->contents) {
|
|
if (evbuffer_file_segment_materialize(seg)<0) {
|
|
EVLOCK_UNLOCK(seg->lock, 0);
|
|
EVBUFFER_UNLOCK(buf);
|
|
return -1;
|
|
}
|
|
}
|
|
}
|
|
++seg->refcnt;
|
|
EVLOCK_UNLOCK(seg->lock, 0);
|
|
|
|
if (buf->freeze_end)
|
|
goto err;
|
|
|
|
if (length < 0) {
|
|
if (offset > seg->length)
|
|
goto err;
|
|
length = seg->length - offset;
|
|
}
|
|
|
|
/* Can we actually add this? */
|
|
if (offset+length > seg->length)
|
|
goto err;
|
|
|
|
chain = evbuffer_chain_new(sizeof(struct evbuffer_chain_file_segment));
|
|
if (!chain)
|
|
goto err;
|
|
extra = EVBUFFER_CHAIN_EXTRA(struct evbuffer_chain_file_segment, chain);
|
|
|
|
chain->flags |= EVBUFFER_IMMUTABLE|EVBUFFER_FILESEGMENT;
|
|
if (can_use_sendfile && seg->can_sendfile) {
|
|
chain->flags |= EVBUFFER_SENDFILE;
|
|
chain->misalign = seg->file_offset + offset;
|
|
chain->off = length;
|
|
chain->buffer_len = chain->misalign + length;
|
|
} else if (seg->is_mapping) {
|
|
#ifdef _WIN32
|
|
ev_uint64_t total_offset = seg->mmap_offset+offset;
|
|
ev_uint64_t offset_rounded=0, offset_remaining=0;
|
|
LPVOID data;
|
|
if (total_offset) {
|
|
SYSTEM_INFO si;
|
|
memset(&si, 0, sizeof(si)); /* cargo cult */
|
|
GetSystemInfo(&si);
|
|
offset_remaining = total_offset % si.dwAllocationGranularity;
|
|
offset_rounded = total_offset - offset_remaining;
|
|
}
|
|
data = MapViewOfFile(
|
|
seg->mapping_handle,
|
|
FILE_MAP_READ,
|
|
offset_rounded >> 32,
|
|
offset_rounded & 0xfffffffful,
|
|
length + offset_remaining);
|
|
if (data == NULL) {
|
|
mm_free(chain);
|
|
goto err;
|
|
}
|
|
chain->buffer = (unsigned char*) data;
|
|
chain->buffer_len = length+offset_remaining;
|
|
chain->misalign = offset_remaining;
|
|
chain->off = length;
|
|
#else
|
|
chain->buffer = (unsigned char*)(seg->contents + offset);
|
|
chain->buffer_len = length;
|
|
chain->off = length;
|
|
#endif
|
|
} else {
|
|
chain->buffer = (unsigned char*)(seg->contents + offset);
|
|
chain->buffer_len = length;
|
|
chain->off = length;
|
|
}
|
|
|
|
extra->segment = seg;
|
|
buf->n_add_for_cb += length;
|
|
evbuffer_chain_insert(buf, chain);
|
|
|
|
evbuffer_invoke_callbacks_(buf);
|
|
|
|
EVBUFFER_UNLOCK(buf);
|
|
|
|
return 0;
|
|
err:
|
|
EVBUFFER_UNLOCK(buf);
|
|
evbuffer_file_segment_free(seg); /* Lowers the refcount */
|
|
return -1;
|
|
}
|
|
|
|
int
|
|
evbuffer_add_file(struct evbuffer *buf, int fd, ev_off_t offset, ev_off_t length)
|
|
{
|
|
struct evbuffer_file_segment *seg;
|
|
unsigned flags = EVBUF_FS_CLOSE_ON_FREE;
|
|
int r;
|
|
|
|
seg = evbuffer_file_segment_new(fd, offset, length, flags);
|
|
if (!seg)
|
|
return -1;
|
|
r = evbuffer_add_file_segment(buf, seg, 0, length);
|
|
if (r == 0)
|
|
evbuffer_file_segment_free(seg);
|
|
return r;
|
|
}
|
|
|
|
void
|
|
evbuffer_setcb(struct evbuffer *buffer, evbuffer_cb cb, void *cbarg)
|
|
{
|
|
EVBUFFER_LOCK(buffer);
|
|
|
|
if (!LIST_EMPTY(&buffer->callbacks))
|
|
evbuffer_remove_all_callbacks(buffer);
|
|
|
|
if (cb) {
|
|
struct evbuffer_cb_entry *ent =
|
|
evbuffer_add_cb(buffer, NULL, cbarg);
|
|
ent->cb.cb_obsolete = cb;
|
|
ent->flags |= EVBUFFER_CB_OBSOLETE;
|
|
}
|
|
EVBUFFER_UNLOCK(buffer);
|
|
}
|
|
|
|
struct evbuffer_cb_entry *
|
|
evbuffer_add_cb(struct evbuffer *buffer, evbuffer_cb_func cb, void *cbarg)
|
|
{
|
|
struct evbuffer_cb_entry *e;
|
|
if (! (e = mm_calloc(1, sizeof(struct evbuffer_cb_entry))))
|
|
return NULL;
|
|
EVBUFFER_LOCK(buffer);
|
|
e->cb.cb_func = cb;
|
|
e->cbarg = cbarg;
|
|
e->flags = EVBUFFER_CB_ENABLED;
|
|
LIST_INSERT_HEAD(&buffer->callbacks, e, next);
|
|
EVBUFFER_UNLOCK(buffer);
|
|
return e;
|
|
}
|
|
|
|
int
|
|
evbuffer_remove_cb_entry(struct evbuffer *buffer,
|
|
struct evbuffer_cb_entry *ent)
|
|
{
|
|
EVBUFFER_LOCK(buffer);
|
|
LIST_REMOVE(ent, next);
|
|
EVBUFFER_UNLOCK(buffer);
|
|
mm_free(ent);
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
evbuffer_remove_cb(struct evbuffer *buffer, evbuffer_cb_func cb, void *cbarg)
|
|
{
|
|
struct evbuffer_cb_entry *cbent;
|
|
int result = -1;
|
|
EVBUFFER_LOCK(buffer);
|
|
LIST_FOREACH(cbent, &buffer->callbacks, next) {
|
|
if (cb == cbent->cb.cb_func && cbarg == cbent->cbarg) {
|
|
result = evbuffer_remove_cb_entry(buffer, cbent);
|
|
goto done;
|
|
}
|
|
}
|
|
done:
|
|
EVBUFFER_UNLOCK(buffer);
|
|
return result;
|
|
}
|
|
|
|
int
|
|
evbuffer_cb_set_flags(struct evbuffer *buffer,
|
|
struct evbuffer_cb_entry *cb, ev_uint32_t flags)
|
|
{
|
|
/* the user isn't allowed to mess with these. */
|
|
flags &= ~EVBUFFER_CB_INTERNAL_FLAGS;
|
|
EVBUFFER_LOCK(buffer);
|
|
cb->flags |= flags;
|
|
EVBUFFER_UNLOCK(buffer);
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
evbuffer_cb_clear_flags(struct evbuffer *buffer,
|
|
struct evbuffer_cb_entry *cb, ev_uint32_t flags)
|
|
{
|
|
/* the user isn't allowed to mess with these. */
|
|
flags &= ~EVBUFFER_CB_INTERNAL_FLAGS;
|
|
EVBUFFER_LOCK(buffer);
|
|
cb->flags &= ~flags;
|
|
EVBUFFER_UNLOCK(buffer);
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
evbuffer_freeze(struct evbuffer *buffer, int start)
|
|
{
|
|
EVBUFFER_LOCK(buffer);
|
|
if (start)
|
|
buffer->freeze_start = 1;
|
|
else
|
|
buffer->freeze_end = 1;
|
|
EVBUFFER_UNLOCK(buffer);
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
evbuffer_unfreeze(struct evbuffer *buffer, int start)
|
|
{
|
|
EVBUFFER_LOCK(buffer);
|
|
if (start)
|
|
buffer->freeze_start = 0;
|
|
else
|
|
buffer->freeze_end = 0;
|
|
EVBUFFER_UNLOCK(buffer);
|
|
return 0;
|
|
}
|
|
|
|
#if 0
|
|
void
|
|
evbuffer_cb_suspend(struct evbuffer *buffer, struct evbuffer_cb_entry *cb)
|
|
{
|
|
if (!(cb->flags & EVBUFFER_CB_SUSPENDED)) {
|
|
cb->size_before_suspend = evbuffer_get_length(buffer);
|
|
cb->flags |= EVBUFFER_CB_SUSPENDED;
|
|
}
|
|
}
|
|
|
|
void
|
|
evbuffer_cb_unsuspend(struct evbuffer *buffer, struct evbuffer_cb_entry *cb)
|
|
{
|
|
if ((cb->flags & EVBUFFER_CB_SUSPENDED)) {
|
|
unsigned call = (cb->flags & EVBUFFER_CB_CALL_ON_UNSUSPEND);
|
|
size_t sz = cb->size_before_suspend;
|
|
cb->flags &= ~(EVBUFFER_CB_SUSPENDED|
|
|
EVBUFFER_CB_CALL_ON_UNSUSPEND);
|
|
cb->size_before_suspend = 0;
|
|
if (call && (cb->flags & EVBUFFER_CB_ENABLED)) {
|
|
cb->cb(buffer, sz, evbuffer_get_length(buffer), cb->cbarg);
|
|
}
|
|
}
|
|
}
|
|
#endif
|
|
|
|
int
|
|
evbuffer_get_callbacks_(struct evbuffer *buffer, struct event_callback **cbs,
|
|
int max_cbs)
|
|
{
|
|
int r = 0;
|
|
EVBUFFER_LOCK(buffer);
|
|
if (buffer->deferred_cbs) {
|
|
if (max_cbs < 1) {
|
|
r = -1;
|
|
goto done;
|
|
}
|
|
cbs[0] = &buffer->deferred;
|
|
r = 1;
|
|
}
|
|
done:
|
|
EVBUFFER_UNLOCK(buffer);
|
|
return r;
|
|
}
|