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Reworked the error handling of non-blocking reads and writes.

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This should prevent busy loops where the socket is makred readable
but we are really only looking for it to become writable.
This commit is contained in:
Jan Vidar Krey 2012-10-16 20:15:38 +02:00
parent 50912bdf75
commit b1f2c93738
5 changed files with 130 additions and 95 deletions
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4
src/network/backend.c
View File

@ -1,6 +1,6 @@
/*
* uhub - A tiny ADC p2p connection hub
* Copyright (C) 2007-2010, Jan Vidar Krey
* Copyright (C) 2007-2012, Jan Vidar Krey
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
@ -180,10 +180,8 @@ void net_con_close(struct net_connection* con)
g_backend->handler.con_del(g_backend->data, con);
#ifdef SSL_SUPPORT
#ifdef SSL_USE_OPENSSL
if (con->ssl)
net_ssl_shutdown(con);
#endif /* SSL_USE_OPENSSL */
#endif /* SSL_SUPPORT */
net_close(con->sd);

2
src/network/backend.h
View File

@ -1,6 +1,6 @@
/*
* uhub - A tiny ADC p2p connection hub
* Copyright (C) 2007-2010, Jan Vidar Krey
* Copyright (C) 2007-2012, Jan Vidar Krey
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by

44
src/network/connection.c
View File

@ -25,6 +25,18 @@ void net_stats_add_tx(size_t bytes);
void net_stats_add_rx(size_t bytes);
#endif
static int is_blocked_or_interrupted()
{
int err = net_error();
return
#ifdef WINSOCK
err == WSAEWOULDBLOCK
#else
err == EWOULDBLOCK
#endif
|| err == EINTR;
}
ssize_t net_con_send(struct net_connection* con, const void* buf, size_t len)
{
int ret;
@ -35,13 +47,7 @@ ssize_t net_con_send(struct net_connection* con, const void* buf, size_t len)
ret = net_send(con->sd, buf, len, UHUB_SEND_SIGNAL);
if (ret == -1)
{
if (
#ifdef WINSOCK
net_error() == WSAEWOULDBLOCK
#else
net_error() == EWOULDBLOCK
#endif
|| net_error() == EINTR)
if (is_blocked_or_interrupted())
return 0;
return -1;
}
@ -65,13 +71,7 @@ ssize_t net_con_recv(struct net_connection* con, void* buf, size_t len)
ret = net_recv(con->sd, buf, len, 0);
if (ret == -1)
{
if (
#ifdef WINSOCK
net_error() == WSAEWOULDBLOCK
#else
net_error() == EWOULDBLOCK
#endif
|| net_error() == EINTR)
if (is_blocked_or_interrupted())
return 0;
return -net_error();
}
@ -94,13 +94,7 @@ ssize_t net_con_peek(struct net_connection* con, void* buf, size_t len)
int ret = net_recv(con->sd, buf, len, MSG_PEEK);
if (ret == -1)
{
if (
#ifdef WINSOCK
net_error() == WSAEWOULDBLOCK
#else
net_error() == EWOULDBLOCK
#endif
|| net_error() == EINTR)
if (is_blocked_or_interrupted())
return 0;
return -net_error();
}
@ -149,12 +143,10 @@ void net_con_callback(struct net_connection* con, int events)
}
#ifdef SSL_SUPPORT
if (!con->ssl)
if (con->ssl)
net_ssl_callback(con, events);
else
#endif
con->callback(con, events, con->ptr);
#ifdef SSL_SUPPORT
else
net_ssl_callback(con, events);
#endif
}

177
src/network/openssl.c
View File

@ -30,6 +30,9 @@ struct net_ssl_openssl
{
SSL* ssl;
enum ssl_state state;
uint32_t flags;
BIO* biow;
BIO* bior;
};
struct net_context_openssl
@ -108,47 +111,6 @@ int ssl_check_private_key(struct ssl_context_handle* ctx_)
return 1;
}
static int handle_openssl_error(struct net_connection* con, int ret)
{
struct net_ssl_openssl* handle = get_handle(con);
int error = SSL_get_error(handle->ssl, ret);
switch (error)
{
case SSL_ERROR_ZERO_RETURN:
LOG_PROTO("SSL_get_error: ret=%d, error=%d: SSL_ERROR_ZERO_RETURN", ret, error);
handle->state = tls_st_error;
return -1;
case SSL_ERROR_WANT_READ:
LOG_PROTO("SSL_get_error: ret=%d, error=%d: SSL_ERROR_WANT_READ", ret, error);
con->flags |= NET_WANT_SSL_READ;
net_con_update(con, NET_EVENT_READ);
return 0;
case SSL_ERROR_WANT_WRITE:
LOG_PROTO("SSL_get_error: ret=%d, error=%d: SSL_ERROR_WANT_WRITE", ret, error);
con->flags |= NET_WANT_SSL_WRITE;
net_con_update(con, NET_EVENT_READ | NET_EVENT_WRITE);
return 0;
case SSL_ERROR_SYSCALL:
LOG_PROTO("SSL_get_error: ret=%d, error=%d: SSL_ERROR_SYSCALL", ret, error);
/* if ret == 0, connection closed, if ret == -1, check with errno */
if (ret == 0)
return -1;
else
return -net_error();
case SSL_ERROR_SSL:
LOG_PROTO("SSL_get_error: ret=%d, error=%d: SSL_ERROR_SSL", ret, error);
/* internal openssl error */
handle->state = tls_st_error;
return -1;
}
return -1;
}
ssize_t net_con_ssl_accept(struct net_connection* con)
{
struct net_ssl_openssl* handle = get_handle(con);
@ -164,7 +126,24 @@ ssize_t net_con_ssl_accept(struct net_connection* con)
}
else
{
return handle_openssl_error(con, ret);
int err = SSL_get_error(handle->ssl, ret);
switch (err)
{
case SSL_ERROR_ZERO_RETURN:
// Not really an error, but SSL was shut down.
return -1;
case SSL_ERROR_WANT_READ:
net_con_update(con, NET_EVENT_READ);
return 0;
case SSL_ERROR_WANT_WRITE:
net_con_update(con, NET_EVENT_WRITE);
return 0;
case SSL_ERROR_SYSCALL:
return -1;
}
}
return ret;
}
@ -175,7 +154,6 @@ ssize_t net_con_ssl_connect(struct net_connection* con)
ssize_t ret;
handle->state = tls_st_connecting;
ret = SSL_connect(handle->ssl);
#ifdef NETWORK_DUMP_DEBUG
LOG_PROTO("SSL_connect() ret=%d", ret);
@ -188,7 +166,24 @@ ssize_t net_con_ssl_connect(struct net_connection* con)
}
else
{
return handle_openssl_error(con, ret);
int err = SSL_get_error(handle->ssl, ret);
switch (err)
{
case SSL_ERROR_ZERO_RETURN:
// Not really an error, but SSL was shut down.
return -1;
case SSL_ERROR_WANT_READ:
net_con_update(con, NET_EVENT_READ);
return 0;
case SSL_ERROR_WANT_WRITE:
net_con_update(con, NET_EVENT_WRITE);
return 0;
case SSL_ERROR_SYSCALL:
return -1;
}
}
return ret;
}
@ -209,6 +204,8 @@ ssize_t net_con_ssl_handshake(struct net_connection* con, enum net_con_ssl_mode
return -1;
}
SSL_set_fd(handle->ssl, con->sd);
handle->bior = SSL_get_rbio(handle->ssl);
handle->biow = SSL_get_wbio(handle->ssl);
con->ssl = (struct ssl_handle*) handle;
return net_con_ssl_accept(con);
}
@ -216,6 +213,8 @@ ssize_t net_con_ssl_handshake(struct net_connection* con, enum net_con_ssl_mode
{
handle->ssl = SSL_new(SSL_CTX_new(TLSv1_method()));
SSL_set_fd(handle->ssl, con->sd);
handle->bior = SSL_get_rbio(handle->ssl);
handle->biow = SSL_get_wbio(handle->ssl);
con->ssl = (struct ssl_handle*) handle;
return net_con_ssl_connect(con);
}
@ -225,15 +224,41 @@ ssize_t net_con_ssl_handshake(struct net_connection* con, enum net_con_ssl_mode
ssize_t net_ssl_send(struct net_connection* con, const void* buf, size_t len)
{
struct net_ssl_openssl* handle = get_handle(con);
// con->write_len = len;
uhub_assert(handle->state == tls_st_connected || handle->state == tls_st_need_write);
ERR_clear_error();
ssize_t ret = SSL_write(handle->ssl, buf, len);
LOG_PROTO("SSL_write(con=%p, buf=%p, len=" PRINTF_SIZE_T ") => %d", con, buf, len, ret);
if (ret <= 0)
if (ret > 0)
{
return handle_openssl_error(con, ret);
}
handle->state = tls_st_connected;
return ret;
}
else if (ret <= 0)
{
int err = SSL_get_error(handle->ssl, ret);
switch (err)
{
case SSL_ERROR_ZERO_RETURN:
// Not really an error, but SSL was shut down.
return -1;
case SSL_ERROR_WANT_READ:
handle->state = tls_st_need_write;
net_con_update(con, NET_EVENT_READ);
return 0;
case SSL_ERROR_WANT_WRITE:
handle->state = tls_st_need_write;
net_con_update(con, NET_EVENT_WRITE);
return 0;
case SSL_ERROR_SYSCALL:
return -1;
}
}
}
ssize_t net_ssl_recv(struct net_connection* con, void* buf, size_t len)
{
@ -243,18 +268,41 @@ ssize_t net_ssl_recv(struct net_connection* con, void* buf, size_t len)
if (handle->state == tls_st_error)
return -1;
uhub_assert(handle->state == tls_st_connected || handle->state == tls_st_need_read);
ERR_clear_error();
ret = SSL_read(handle->ssl, buf, len);
LOG_PROTO("SSL_read(con=%p, buf=%p, len=" PRINTF_SIZE_T ") => %d", con, buf, len, ret);
if (ret > 0)
{
net_con_update(con, NET_EVENT_READ);
}
else
{
return handle_openssl_error(con, ret);
}
handle->state = tls_st_connected;
return ret;
}
else if (ret <= 0)
{
int err = SSL_get_error(handle->ssl, ret);
switch (err)
{
case SSL_ERROR_ZERO_RETURN:
// Not really an error, but SSL was shut down.
return -1;
case SSL_ERROR_WANT_READ:
handle->state = tls_st_need_read;
net_con_update(con, NET_EVENT_READ);
return 0;
case SSL_ERROR_WANT_WRITE:
handle->state = tls_st_need_read;
net_con_update(con, NET_EVENT_WRITE);
return 0;
case SSL_ERROR_SYSCALL:
return -1;
}
}
}
void net_ssl_shutdown(struct net_connection* con)
{
@ -299,20 +347,15 @@ void net_ssl_callback(struct net_connection* con, int events)
con->callback(con, NET_EVENT_READ, con->ptr);
break;
case tls_st_need_read:
con->callback(con, NET_EVENT_READ, con->ptr);
break;
case tls_st_need_write:
con->callback(con, NET_EVENT_WRITE, con->ptr);
break;
case tls_st_connected:
LOG_PROTO("tls_st_connected, events=%s%s, ssl_flags=%s%s", (events & NET_EVENT_READ ? "R" : ""), (events & NET_EVENT_WRITE ? "W" : ""), flags & NET_WANT_SSL_READ ? "R" : "", flags & NET_WANT_SSL_WRITE ? "W" : "");
if (events & NET_EVENT_WRITE && flags & NET_WANT_SSL_READ)
{
con->callback(con, events & NET_EVENT_READ, con->ptr);
return;
}
if (events & NET_EVENT_READ && flags & NET_WANT_SSL_WRITE)
{
con->callback(con, events & NET_EVENT_READ, con->ptr);
return;
}
con->callback(con, events, con->ptr);
break;

2
src/network/tls.h
View File

@ -32,6 +32,8 @@ enum ssl_state
tls_st_accepting,
tls_st_connecting,
tls_st_connected,
tls_st_need_read, /* special case of connected */
tls_st_need_write, /* special case of connected */
tls_st_disconnecting,
};