Branch
Hash :
fef2a867
Author :
Date :
2024-05-21T11:05:23
Fix -Wcast-function-type errors --------- Signed-off-by: Andy Pan <i@andypan.me>
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/*
* Copyright (c) 2009-2012 Niels Provos and Nick Mathewson
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "event2/event-config.h"
#include "evconfig-private.h"
#ifdef _WIN32
# include <winsock2.h>
#endif
#include <string.h>
#include <openssl/ssl.h>
#include <openssl/err.h>
#include "openssl-compat.h"
#include "event2/bufferevent.h"
#include "event2/bufferevent_struct.h"
#include "event2/buffer.h"
#include "ssl-compat.h"
/*
* Define an OpenSSL bio that targets a bufferevent.
*/
/* --------------------
A BIO is an OpenSSL abstraction that handles reading and writing data. The
library will happily speak SSL over anything that implements a BIO
interface.
Here we define a BIO implementation that directs its output to a
bufferevent. We'll want to use this only when none of OpenSSL's built-in
IO mechanisms work for us.
-------------------- */
/* every BIO type needs its own integer type value. */
#define BIO_TYPE_LIBEVENT 57
/* ???? Arguably, we should set BIO_TYPE_FILTER or BIO_TYPE_SOURCE_SINK on
* this. */
#if 0
static void
print_err(int val)
{
int err;
printf("Error was %d\n", val);
while ((err = ERR_get_error())) {
const char *msg = (const char*)ERR_reason_error_string(err);
const char *lib = (const char*)ERR_lib_error_string(err);
const char *func = (const char*)ERR_func_error_string(err);
printf("%s in %s %s\n", msg, lib, func);
}
}
#else
static void
print_err(int val)
{
}
#endif
/* Called to initialize a new BIO */
static int
bio_bufferevent_new(BIO *b)
{
BIO_set_init(b, 0);
BIO_set_data(b, NULL); /* We'll be putting the bufferevent in this field.*/
return 1;
}
/* Called to uninitialize the BIO. */
static int
bio_bufferevent_free(BIO *b)
{
if (!b)
return 0;
if (BIO_get_shutdown(b)) {
if (BIO_get_init(b) && BIO_get_data(b))
bufferevent_free(BIO_get_data(b));
BIO_free(b);
}
return 1;
}
/* Called to extract data from the BIO. */
static int
bio_bufferevent_read(BIO *b, char *out, int outlen)
{
int r = 0;
struct evbuffer *input;
BIO_clear_retry_flags(b);
if (!out)
return 0;
if (!BIO_get_data(b))
return -1;
input = bufferevent_get_input(BIO_get_data(b));
if (evbuffer_get_length(input) == 0) {
/* If there's no data to read, say so. */
BIO_set_retry_read(b);
return -1;
} else {
r = evbuffer_remove(input, out, outlen);
}
return r;
}
/* Called to write data into the BIO */
static int
bio_bufferevent_write(BIO *b, const char *in, int inlen)
{
struct bufferevent *bufev = BIO_get_data(b);
struct evbuffer *output;
size_t outlen;
BIO_clear_retry_flags(b);
if (!bufev)
return -1;
output = bufferevent_get_output(bufev);
outlen = evbuffer_get_length(output);
/* Copy only as much data onto the output buffer as can fit under the
* high-water mark. */
if (bufev->wm_write.high && bufev->wm_write.high <= (outlen + inlen)) {
if (bufev->wm_write.high <= outlen) {
/* If no data can fit, we'll need to retry later. */
BIO_set_retry_write(b);
return -1;
}
inlen = bufev->wm_write.high - outlen;
}
EVUTIL_ASSERT(inlen > 0);
evbuffer_add(output, in, inlen);
return inlen;
}
/* Called to handle various requests */
static long
bio_bufferevent_ctrl(BIO *b, int cmd, long num, void *ptr)
{
struct bufferevent *bufev = BIO_get_data(b);
long ret = 1;
switch (cmd) {
case BIO_CTRL_GET_CLOSE:
ret = BIO_get_shutdown(b);
break;
case BIO_CTRL_SET_CLOSE:
BIO_set_shutdown(b, (int)num);
break;
case BIO_CTRL_PENDING:
ret = evbuffer_get_length(bufferevent_get_input(bufev)) != 0;
break;
case BIO_CTRL_WPENDING:
ret = evbuffer_get_length(bufferevent_get_output(bufev)) != 0;
break;
/* XXXX These two are given a special-case treatment because
* of cargo-cultism. I should come up with a better reason. */
case BIO_CTRL_DUP:
case BIO_CTRL_FLUSH:
ret = 1;
break;
default:
ret = 0;
break;
}
return ret;
}
/* Called to write a string to the BIO */
static int
bio_bufferevent_puts(BIO *b, const char *s)
{
return bio_bufferevent_write(b, s, strlen(s));
}
/* Method table for the bufferevent BIO */
static BIO_METHOD *methods_bufferevent;
/* Return the method table for the bufferevents BIO */
static BIO_METHOD *
BIO_s_bufferevent(void)
{
if (methods_bufferevent == NULL) {
methods_bufferevent = BIO_meth_new(BIO_TYPE_LIBEVENT, "bufferevent");
if (methods_bufferevent == NULL)
return NULL;
BIO_meth_set_write(methods_bufferevent, bio_bufferevent_write);
BIO_meth_set_read(methods_bufferevent, bio_bufferevent_read);
BIO_meth_set_puts(methods_bufferevent, bio_bufferevent_puts);
BIO_meth_set_ctrl(methods_bufferevent, bio_bufferevent_ctrl);
BIO_meth_set_create(methods_bufferevent, bio_bufferevent_new);
BIO_meth_set_destroy(methods_bufferevent, bio_bufferevent_free);
}
return methods_bufferevent;
}
/* Create a new BIO to wrap communication around a bufferevent. If close_flag
* is true, the bufferevent will be freed when the BIO is closed. */
static BIO *
BIO_new_bufferevent(struct bufferevent *bufferevent)
{
BIO *result;
if (!bufferevent)
return NULL;
if (!(result = BIO_new(BIO_s_bufferevent())))
return NULL;
BIO_set_init(result, 1);
BIO_set_data(result, bufferevent);
/* We don't tell the BIO to close the bufferevent; we do it ourselves on
* be_openssl_destruct() */
BIO_set_shutdown(result, 0);
return result;
}
static void
conn_closed(struct bufferevent_ssl *bev_ssl, int when, int errcode, int ret)
{
int event = BEV_EVENT_ERROR;
int dirty_shutdown = 0;
unsigned long err;
switch (errcode) {
case SSL_ERROR_ZERO_RETURN:
/* Possibly a clean shutdown. */
if (SSL_get_shutdown(bev_ssl->ssl) & SSL_RECEIVED_SHUTDOWN)
event = BEV_EVENT_EOF;
else
dirty_shutdown = 1;
break;
case SSL_ERROR_SYSCALL:
/* IO error; possibly a dirty shutdown. */
if ((ret == 0 || ret == -1) && ERR_peek_error() == 0)
dirty_shutdown = 1;
bufferevent_ssl_put_error(bev_ssl, errcode);
break;
case SSL_ERROR_SSL:
/* Protocol error; possibly a dirty shutdown. */
if (ret == 0 && SSL_is_init_finished(bev_ssl->ssl) == 0)
dirty_shutdown = 1;
bufferevent_ssl_put_error(bev_ssl, errcode);
break;
case SSL_ERROR_WANT_X509_LOOKUP:
/* XXXX handle this. */
bufferevent_ssl_put_error(bev_ssl, errcode);
break;
case SSL_ERROR_NONE:
case SSL_ERROR_WANT_READ:
case SSL_ERROR_WANT_WRITE:
case SSL_ERROR_WANT_CONNECT:
case SSL_ERROR_WANT_ACCEPT:
default:
/* should be impossible; treat as normal error. */
event_warnx("BUG: Unexpected OpenSSL error code %d", errcode);
break;
}
while ((err = ERR_get_error())) {
bufferevent_ssl_put_error(bev_ssl, err);
}
if (dirty_shutdown && bev_ssl->flags & BUFFEREVENT_SSL_DIRTY_SHUTDOWN)
event = BEV_EVENT_EOF;
bufferevent_ssl_stop_reading(bev_ssl);
bufferevent_ssl_stop_writing(bev_ssl);
/* when is BEV_EVENT_{READING|WRITING} */
event = when | event;
bufferevent_run_eventcb_(&bev_ssl->bev.bev, event, 0);
}
static void
init_bio_counts(struct bufferevent_ssl *bev_ssl)
{
BIO *rbio, *wbio;
wbio = SSL_get_wbio(bev_ssl->ssl);
bev_ssl->counts.n_written = wbio ? BIO_number_written(wbio) : 0;
rbio = SSL_get_rbio(bev_ssl->ssl);
bev_ssl->counts.n_read = rbio ? BIO_number_read(rbio) : 0;
}
static inline void
decrement_buckets(struct bufferevent_ssl *bev_ssl)
{
unsigned long num_w = BIO_number_written(SSL_get_wbio(bev_ssl->ssl));
unsigned long num_r = BIO_number_read(SSL_get_rbio(bev_ssl->ssl));
/* These next two subtractions can wrap around. That's okay. */
unsigned long w = num_w - bev_ssl->counts.n_written;
unsigned long r = num_r - bev_ssl->counts.n_read;
if (w)
bufferevent_decrement_write_buckets_(&bev_ssl->bev, w);
if (r)
bufferevent_decrement_read_buckets_(&bev_ssl->bev, r);
bev_ssl->counts.n_written = num_w;
bev_ssl->counts.n_read = num_r;
}
static void *
SSL_init(void *ssl)
{
/* Don't explode if we decide to realloc a chunk we're writing from in
* the output buffer. */
SSL_set_mode(ssl, SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER);
return ssl;
}
static void
SSL_context_free(void *ssl, int flags)
{
if (flags & BEV_OPT_CLOSE_ON_FREE)
SSL_free(ssl);
}
static int
SSL_handshake_is_ok(int err)
{
/* What SSL_do_handshake() return on success */
return err == 1;
}
static int
SSL_is_want_read(int err)
{
return err == SSL_ERROR_WANT_READ;
}
static int
SSL_is_want_write(int err)
{
return err == SSL_ERROR_WANT_WRITE;
}
static int
openssl_read(void *ssl, unsigned char *buf, size_t len)
{
return SSL_read(ssl, buf, len);
}
static int
openssl_write(void *ssl, const unsigned char *buf, size_t len)
{
return SSL_write(ssl, buf, len);
}
static evutil_socket_t
be_openssl_get_fd(struct bufferevent_ssl *bev_ssl)
{
evutil_socket_t fd = EVUTIL_INVALID_SOCKET;
BIO *bio = SSL_get_wbio(bev_ssl->ssl);
if (bio)
fd = BIO_get_fd(bio, NULL);
return fd;
}
static int
be_openssl_bio_set_fd(struct bufferevent_ssl *bev_ssl, evutil_socket_t fd)
{
if (!bev_ssl->underlying) {
BIO *bio;
bio = BIO_new_socket((int)fd, 0);
SSL_set_bio(bev_ssl->ssl, bio, bio);
} else {
BIO *bio;
if (!(bio = BIO_new_bufferevent(bev_ssl->underlying)))
return -1;
SSL_set_bio(bev_ssl->ssl, bio, bio);
}
return 0;
}
static size_t SSL_pending_wrap(void *ssl)
{
return SSL_pending(ssl);
}
static struct le_ssl_ops le_openssl_ops = {
SSL_init,
SSL_context_free,
(void (*)(void *))SSL_free,
(int (*)(void *))SSL_renegotiate,
openssl_write,
openssl_read,
SSL_pending_wrap,
(int (*)(void *))SSL_do_handshake,
(int (*)(void *, int))SSL_get_error,
ERR_clear_error,
(int (*)(void *))SSL_clear,
(void (*)(void *))SSL_set_connect_state,
(void (*)(void *))SSL_set_accept_state,
SSL_handshake_is_ok,
SSL_is_want_read,
SSL_is_want_write,
(evutil_socket_t (*)(void *))be_openssl_get_fd,
be_openssl_bio_set_fd,
init_bio_counts,
decrement_buckets,
conn_closed,
print_err,
};
struct bufferevent *
bufferevent_openssl_filter_new(struct event_base *base,
struct bufferevent *underlying,
SSL *ssl,
enum bufferevent_ssl_state state,
int options)
{
BIO *bio;
struct bufferevent *bev;
if (!underlying)
goto err;
if (!(bio = BIO_new_bufferevent(underlying)))
goto err;
SSL_set_bio(ssl, bio, bio);
bev = bufferevent_ssl_new_impl(
base, underlying, -1, ssl, state, options, &le_openssl_ops);
return bev;
err:
if (options & BEV_OPT_CLOSE_ON_FREE)
SSL_free(ssl);
return NULL;
}
struct bufferevent *
bufferevent_openssl_socket_new(struct event_base *base,
evutil_socket_t fd,
SSL *ssl,
enum bufferevent_ssl_state state,
int options)
{
/* Does the SSL already have an fd? */
BIO *bio = SSL_get_wbio(ssl);
long have_fd = -1;
if (bio)
have_fd = BIO_get_fd(bio, NULL);
if (have_fd >= 0) {
/* The SSL is already configured with an fd. */
if (fd < 0) {
/* We should learn the fd from the SSL. */
fd = (evutil_socket_t) have_fd;
} else if (have_fd == (long)fd) {
/* We already know the fd from the SSL; do nothing */
} else {
/* We specified an fd different from that of the SSL.
This is probably an error on our part. Fail. */
goto err;
}
(void)BIO_set_close(bio, 0);
} else {
/* The SSL isn't configured with a BIO with an fd. */
if (fd >= 0) {
/* ... and we have an fd we want to use. */
bio = BIO_new_socket((int)fd, 0);
SSL_set_bio(ssl, bio, bio);
} else {
/* Leave the fd unset. */
}
}
return bufferevent_ssl_new_impl(
base, NULL, fd, ssl, state, options, &le_openssl_ops);
err:
if (options & BEV_OPT_CLOSE_ON_FREE)
SSL_free(ssl);
return NULL;
}
int
bufferevent_ssl_renegotiate(struct bufferevent *bev)
{
return bufferevent_ssl_renegotiate_impl(bev);
}
SSL *
bufferevent_openssl_get_ssl(struct bufferevent *bufev)
{
struct bufferevent_ssl *bev_ssl = bufferevent_ssl_upcast(bufev);
if (!bev_ssl)
return NULL;
return bev_ssl->ssl;
}
int
bufferevent_openssl_get_allow_dirty_shutdown(struct bufferevent *bev)
{
return bufferevent_ssl_get_allow_dirty_shutdown(bev);
}
void
bufferevent_openssl_set_allow_dirty_shutdown(
struct bufferevent *bev, int allow_dirty_shutdown)
{
bufferevent_ssl_set_allow_dirty_shutdown(bev, allow_dirty_shutdown);
}
unsigned long
bufferevent_get_openssl_error(struct bufferevent *bufev)
{
struct bufferevent_ssl *bev_ssl = bufferevent_ssl_upcast(bufev);
if (!bev_ssl)
return 0;
return bufferevent_get_ssl_error(bufev);
}