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pipetcp.c
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pipetcp.c
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/*
* Copyright (c) 2021 Jinoh Kang
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#ifndef WINVER
#define WINVER 0x0500
#endif
#ifndef _WIN32_WINNT
#define _WIN32_WINNT 0x0500
#endif
#ifndef WIN32_LEAN_AND_MEAN
#define WIN32_LEAN_AND_MEAN
#endif
#include <stdio.h>
#include <assert.h>
#include <stdlib.h>
#include <wchar.h>
#include <windows.h>
#include <sddl.h>
#include <winsock2.h>
#include <ws2tcpip.h>
#include "list.h"
#include "ring.h"
#include "errors.h"
#define IOCP_USED 1
typedef BOOL WINAPI (*LPCANCELIOEX)(HANDLE hFile, LPOVERLAPPED lpOverlapped);
enum struct_magic
{
CLIENT_OBJ_MAGIC = 0X22B778B9,
SERVER_OBJ_MAGIC = 0x1733531A,
};
enum retry_flags
{
RETRY_READ = 1,
RETRY_WRITE = 2,
};
enum status
{
IOSTATE_IDLE,
IOSTATE_PENDING,
};
enum connect_status
{
CLIENT_DISCONNECTED,
CLIENT_CONNECTED,
};
enum server_state
{
SERVER_INITIALISING,
SERVER_LISTENING,
SERVER_TERMINATING,
};
struct pipeserver_params
{
LPCWSTR name;
DWORD open_mode;
DWORD pipe_mode;
DWORD max_instances;
DWORD out_buffer_size;
DWORD in_buffer_size;
DWORD default_timeout;
LPSECURITY_ATTRIBUTES security_attributes;
};
struct socket_tx
{
struct listhead list;
unsigned char state;
WSABUF iovs[2];
DWORD iovcnt, iovoff;
struct client *cli_ref;
};
struct pipe_tx
{
struct listhead list;
unsigned char state;
unsigned char *buffer;
DWORD length;
struct server *srv_ref;
};
struct server
{
DWORD magic;
unsigned long refcount;
struct listhead clients[2];
struct listhead retry_io_clients;
struct listhead socket_tx_queue;
struct pipeserver_params params;
DWORD num_threads;
unsigned char is_datagram;
unsigned char state;
unsigned char read_pending;
DWORD error;
DWORD last_tick_time;
unsigned long num_clients[2];
unsigned long num_backlog;
size_t required_room;
HANDLE iocp;
SOCKET socket;
WSAOVERLAPPED sock_read_ov;
WSAOVERLAPPED sock_write_ov;
WSABUF iovs[2];
struct pipe_tx socket2pipe;
struct ring readbuf;
};
struct client
{
DWORD magic;
unsigned long refcount;
struct listhead list;
struct listhead list_retry_io;
struct listhead pipe_tx_queue;
struct slisthead slist_closing;
struct slisthead slist_retrying;
struct server *srv;
DWORD next_io_retry_at;
unsigned char retry_flags;
unsigned char is_connected;
unsigned char read_pending;
size_t required_room;
HANDLE pipe;
OVERLAPPED pipe_connect_ov;
OVERLAPPED pipe_read_ov;
OVERLAPPED pipe_write_ov;
struct socket_tx pipe2socket;
struct ring readbuf;
};
#include "udm.h"
#ifdef DEBUG
#define trace_prefix_(x, y) x ":" #y " "
#define trace_prefix(x, y) trace_prefix_(x, y)
#define trace(...) fprintf(stderr, trace_prefix(__FILE__, __LINE__) __VA_ARGS__)
#else
#define trace(...) ((void)0)
#endif
static LPCANCELIOEX lpCancelIoEx;
static DWORD on_server_write(struct server *srv, DWORD err, DWORD nsent);
static DWORD on_server_read(struct server *srv, DWORD err, DWORD nread);
static DWORD on_client_connect(struct client *cli, DWORD err);
static DWORD on_client_read(struct client *cli, DWORD err, DWORD nread);
static DWORD on_client_write(struct client *cli, DWORD err, DWORD nwritten);
static DWORD update_client(struct client *cli, BOOL incoming, unsigned char suppress_io);
static DWORD update_server(struct server *srv, BOOL incoming, unsigned char suppress_io);
static void remove_socket_tx(struct socket_tx *item);
static void remove_pipe_tx(struct pipe_tx *item);
static DWORD server_start_read(struct server *srv);
static DWORD server_start_write(struct server *srv);
static DWORD client_start_connect(struct client *cli);
static DWORD client_start_read(struct client *cli);
static DWORD client_start_write(struct client *cli);
static void dumpring(struct ring const *r, const char *name)
{
(void)r;
(void)name;
trace("## [%s] %p: PROD=%u CONS=%u [", name, r, (unsigned)r->prod, (unsigned)r->cons);
#if 0
for (size_t i = r->cons; i != r->prod; i = (i + 1) % RING_BUFFER_SIZE)
fputc(r->buffer[i], stderr);
#endif
trace("]\n");
}
static BOOL is_pipe_datagram(struct server const *srv)
{
return (srv->params.pipe_mode & PIPE_TYPE_MESSAGE) == PIPE_TYPE_MESSAGE;
}
static void check_client_obj(struct client const *cli)
{
if (cli->magic != CLIENT_OBJ_MAGIC || !cli->refcount) {
fprintf(stderr, "invalid client object (%p): %#lx, %lu\n", cli, cli->magic, cli->refcount);
abort();
}
}
static void check_server_obj(struct server const *srv)
{
if (srv->magic != SERVER_OBJ_MAGIC || !srv->refcount) {
fprintf(stderr, "invalid server object (%p): %#lx, %lu\n", srv, srv->magic, srv->refcount);
abort();
}
}
static struct server *server_get(struct server *srv)
{
if (!srv)
return srv;
check_server_obj(srv);
srv->refcount++;
check_server_obj(srv);
return srv;
}
static void server_put(struct server *srv)
{
if (!srv)
return;
check_server_obj(srv);
if (!--srv->refcount) {
DWORD err = GetLastError();
if (srv->iocp) {
CloseHandle(srv->iocp);
srv->iocp = NULL;
}
SetLastError(err);
}
return;
}
static struct client *client_alloc(void)
{
#ifdef UAF_DEBUG
return (struct client *)udm_alloc();
#else
return (struct client *)HeapAlloc(
GetProcessHeap(),
0,
sizeof(struct client)
);
#endif
}
static void client_free(struct client *cli)
{
trace("client_free(%p)\n", cli);
#ifdef UAF_DEBUG
udm_free((void *)cli);
#else
HeapFree(GetProcessHeap(), 0, (void *)cli);
#endif
}
static struct client *client_get(struct client *cli)
{
trace("client_get(%p) #refs=%lu\n", cli, cli ? cli->refcount : 0);
if (!cli)
return cli;
check_client_obj(cli);
cli->refcount++;
check_client_obj(cli);
return cli;
}
static void client_put(struct client *cli)
{
trace("client_put(%p) #refs=%lu\n", cli, cli ? cli->refcount : 0);
if (!cli)
return;
check_client_obj(cli);
if (!--cli->refcount) {
DWORD err = GetLastError();
if (cli->pipe != INVALID_HANDLE_VALUE) {
CloseHandle(cli->pipe);
cli->pipe = INVALID_HANDLE_VALUE;
}
server_put(cli->srv);
client_free(cli);
SetLastError(err);
}
}
static void set_server_ref(struct server **ptr, struct server *srv)
{
struct server *old;
old = *ptr;
if (old != srv) {
*ptr = server_get(srv);
server_put(old);
}
}
static void set_client_ref(struct client **ptr, struct client *cli)
{
struct client *old;
old = *ptr;
if (old != cli) {
*ptr = client_get(cli);
client_put(old);
}
}
static struct server *pop_server_ref(struct server **ptr)
{
struct server *old = *ptr;
*ptr = NULL;
return old;
}
static struct client *pop_client_ref(struct client **ptr)
{
struct client *old = *ptr;
*ptr = NULL;
return old;
}
static void client_remove_from_list(struct client *cli)
{
unsigned long num;
struct server *srv = cli->srv;
check_client_obj(cli);
if (!srv || list_empty(&cli->list))
return;
list_remove(&cli->list);
num = srv->num_clients[!!cli->is_connected]--;
if (!num) {
fprintf(stderr, "counter underflow\n");
abort();
}
}
static void client_add_to_list(struct client *cli)
{
unsigned long num;
struct server *srv = cli->srv;
check_client_obj(cli);
if (!srv || !list_empty(&cli->list))
return;
list_append(&srv->clients[!!cli->is_connected], &cli->list);
num = ++srv->num_clients[!!cli->is_connected];
if (!num) {
fprintf(stderr, "counter overflow\n");
abort();
}
}
static void client_cancel_retry(struct client *cli, unsigned char retry_flags)
{
check_client_obj(cli);
cli->retry_flags &= ~retry_flags;
if (!cli->retry_flags)
list_remove(&cli->list_retry_io);
}
static void client_set_connected(struct client *cli, BOOL connected)
{
unsigned char new_is_connected = !!connected;
check_client_obj(cli);
if (cli->is_connected == new_is_connected)
return;
client_cancel_retry(cli, RETRY_READ);
client_remove_from_list(cli);
cli->is_connected = new_is_connected;
client_add_to_list(cli);
}
static BOOL client_is_reusable(struct client *cli)
{
check_client_obj(cli);
if (list_empty(&cli->list)) {
/* client is already removed and awaiting free */
return FALSE;
}
if (cli->is_connected) {
/* cannot reuse an already connected client */
return FALSE;
}
if (cli->read_pending != IOSTATE_IDLE) {
/* has pending I/O, cannot reuse */
return FALSE;
}
if (!list_empty(&cli->pipe_tx_queue)) {
/* TX queue is waiting to be flushed */
return FALSE;
}
if ((cli->retry_flags & RETRY_READ) && !list_empty(&cli->list_retry_io)) {
/* retrying connection */
return FALSE;
}
if (!list_empty(&cli->pipe2socket.list)) {
/* TODO should this block reusing client? */
return FALSE;
}
return TRUE;
}
static void client_close(struct client *cli)
{
DECLARE_LISTHEAD(remove_list);
struct listhead *item, *next;
struct pipe_tx *tx;
DWORD err;
trace("client_close(%p)\n", cli);
check_client_obj(cli);
err = GetLastError();
if (cli->is_connected) {
if (cli->pipe != INVALID_HANDLE_VALUE) {
HANDLE handle = cli->pipe;
if (lpCancelIoEx) {
(*lpCancelIoEx)(handle, &cli->pipe_connect_ov);
(*lpCancelIoEx)(handle, &cli->pipe_read_ov);
(*lpCancelIoEx)(handle, &cli->pipe_write_ov);
} else {
CancelIo(handle);
}
DisconnectNamedPipe(handle);
}
client_set_connected(cli, FALSE);
}
foreach_list_safe(&cli->pipe_tx_queue, item, next) {
tx = CONTAINING_RECORD(item, struct pipe_tx, list);
if (tx->state == IOSTATE_IDLE) {
list_remove(item);
list_append(&remove_list, item);
}
}
foreach_list_safe(&remove_list, item, next) {
tx = CONTAINING_RECORD(item, struct pipe_tx, list);
remove_pipe_tx(tx);
assert(next->prev != item);
}
assert(list_empty(&remove_list));
update_client(cli, FALSE, 0);
SetLastError(err);
}
static void client_handle_error(struct client *cli, DWORD err, unsigned char retry_flags, DWORD retry_delay)
{
trace("client_handle_error(%p, %lu, %d, %lu)\n", cli, err, retry_flags, retry_delay);
check_client_obj(cli);
if (list_empty(&cli->list))
return;
if (is_error_nonrecoverable(err)) {
fprintf(stderr, "killing client %p due to %lu\n", cli->pipe, err);
client_close(cli);
return;
}
if (err != ERROR_RETRY) {
cli->retry_flags |= retry_flags;
if (list_empty(&cli->list_retry_io)) {
cli->next_io_retry_at = GetTickCount() + retry_delay;
list_append(&cli->srv->retry_io_clients, &cli->list_retry_io);
}
update_client(cli, FALSE, 0);
} else {
update_client(cli, FALSE, retry_flags);
}
}
static unsigned long server_get_num_clients(struct server const *srv)
{
check_server_obj(srv);
return srv->num_clients[CLIENT_DISCONNECTED] + srv->num_clients[CLIENT_CONNECTED];
}
static BOOL server_register_handle(struct server *srv, HANDLE handle, ULONG_PTR key)
{
HANDLE iocp;
trace("server_register_handle(%p, %p, %p)\n", srv, handle, (void *)key);
check_server_obj(srv);
iocp = CreateIoCompletionPort(handle, srv->iocp, key, srv->num_threads);
if (!iocp)
return FALSE;
srv->iocp = iocp;
return TRUE;
}
static BOOL server_init(struct server *srv,
struct pipeserver_params const *params,
unsigned long backlog,
DWORD num_threads,
SOCKET socket,
BOOL is_datagram)
{
srv->magic = SERVER_OBJ_MAGIC;
srv->refcount = 1;
list_init(&srv->clients[CLIENT_DISCONNECTED]);
list_init(&srv->clients[CLIENT_CONNECTED]);
list_init(&srv->retry_io_clients);
list_init(&srv->socket_tx_queue);
srv->params = *params;
srv->num_threads = num_threads;
srv->is_datagram = !!is_datagram;
srv->state = SERVER_INITIALISING;
srv->read_pending = IOSTATE_IDLE;
srv->error = ERROR_SUCCESS;
srv->last_tick_time = 0;
srv->num_clients[CLIENT_DISCONNECTED] = 0;
srv->num_clients[CLIENT_CONNECTED] = 0;
srv->num_backlog = backlog;
srv->required_room = 1;
srv->iocp = NULL;
srv->socket = socket;
memset(&srv->sock_read_ov, 0, sizeof(srv->sock_read_ov));
memset(&srv->sock_write_ov, 0, sizeof(srv->sock_write_ov));
memset(&srv->iovs, 0, sizeof(srv->iovs));
memset(&srv->socket2pipe, 0, sizeof(struct pipe_tx));
list_init(&srv->socket2pipe.list);
srv->readbuf.prod = 0;
srv->readbuf.cons = 0;
return server_register_handle(srv, (HANDLE)socket, 0);
}
static void server_close_clients(struct server *srv)
{
DECLARE_SLISTHEAD(closing_list);
struct client *cli;
struct listhead *item, *next;
struct slisthead *sitem;
unsigned int is_connected;
assert(srv->state == SERVER_TERMINATING);
for (is_connected = CLIENT_DISCONNECTED; is_connected <= CLIENT_CONNECTED; is_connected++) {
foreach_list_safe(&srv->clients[is_connected], item, next) {
cli = CONTAINING_RECORD(item, struct client, list);
client_get(cli);
assert(slist_empty(&cli->slist_closing));
slist_push(&closing_list, &cli->slist_closing);
}
}
while ((sitem = slist_pop(&closing_list))) {
cli = CONTAINING_RECORD(sitem, struct client, slist_closing);
client_close(cli);
client_put(cli);
}
assert(list_empty(&srv->clients[CLIENT_DISCONNECTED]));
assert(list_empty(&srv->clients[CLIENT_CONNECTED]));
}
static void server_close(struct server *srv)
{
DECLARE_LISTHEAD(remove_list);
struct listhead *item, *next;
struct socket_tx *tx;
DWORD err;
trace("server_close(%p)\n", srv);
check_server_obj(srv);
if (srv->state == SERVER_TERMINATING)
return;
err = GetLastError();
srv->state = SERVER_TERMINATING;
server_close_clients(srv);
foreach_list_safe(&srv->socket_tx_queue, item, next) {
tx = CONTAINING_RECORD(item, struct socket_tx, list);
if (tx->state == IOSTATE_IDLE) {
list_remove(item);
list_append(&remove_list, item);
}
}
foreach_list_safe(&remove_list, item, next) {
tx = CONTAINING_RECORD(item, struct socket_tx, list);
remove_socket_tx(tx);
assert(next->prev != item);
}
assert(list_empty(&remove_list));
if (srv->socket != INVALID_SOCKET) {
HANDLE handle = (HANDLE)srv->socket;
if (lpCancelIoEx) {
(*lpCancelIoEx)(handle, &srv->sock_read_ov);
(*lpCancelIoEx)(handle, &srv->sock_write_ov);
} else {
CancelIo(handle);
}
shutdown(srv->socket, SD_BOTH);
}
server_put(srv);
SetLastError(err);
}
static void server_error(struct server *srv, DWORD err)
{
trace("server_error(%p, %lu)\n", srv, err);
fprintf(stderr, "killing server due to %lu\n", err);
check_server_obj(srv);
if (srv->error == ERROR_SUCCESS)
srv->error = err;
server_close(srv);
}
static BOOL server_is_accepting_clients(struct server *srv, unsigned long count)
{
unsigned long max_clients;
if (srv->state == SERVER_TERMINATING)
return FALSE;
if (count > srv->num_backlog ||
srv->num_clients[CLIENT_DISCONNECTED] > srv->num_backlog - count)
return FALSE;
max_clients = srv->params.max_instances == PIPE_UNLIMITED_INSTANCES
? (unsigned long)-1 : srv->params.max_instances;
if (count > max_clients ||
server_get_num_clients(srv) > max_clients - count)
return FALSE;
return TRUE;
}
static size_t iovec_advance(WSABUF *iovec, size_t count, ULONG len)
{
size_t i;
for (i = 0; i < count; i++) {
if (iovec[i].len > len) {
iovec[i].buf += len;
iovec[i].len -= len;
break;
}
}
return i;
}
static void server_append_tx(struct server *srv, struct socket_tx *tx)
{
trace("server_append_tx(%p, %p)\n", srv, tx);
check_server_obj(srv);
assert(list_empty(&tx->list));
assert(tx->state == IOSTATE_IDLE);
list_append(&srv->socket_tx_queue, &tx->list);
server_start_write(srv);
}
static void client_append_tx(struct client *cli, struct pipe_tx *tx)
{
trace("client_append_tx(%p, %p)\n", cli, tx);
check_client_obj(cli);
assert(list_empty(&tx->list));
assert(tx->state == IOSTATE_IDLE);
list_append(&cli->pipe_tx_queue, &tx->list);
client_start_write(cli);
}
static void remove_socket_tx(struct socket_tx *item)
{
struct client *cli;
trace("remove_socket_tx(%p)\n", item);
assert(item->state == IOSTATE_IDLE);
list_remove(&item->list);
memset(&item->iovs, 0, sizeof(item->iovs));
item->iovcnt = 0;
item->iovoff = 0;
cli = pop_client_ref(&item->cli_ref);
if (cli) {
update_client(cli, FALSE, 0);
client_put(cli);
}
}
static void remove_pipe_tx(struct pipe_tx *item)
{
struct server *srv;
trace("remove_pipe_tx(%p)\n", item);
assert(item->state == IOSTATE_IDLE);
list_remove(&item->list);
item->buffer = NULL;
item->length = 0;
srv = pop_server_ref(&item->srv_ref);
if (srv) {
update_server(srv, FALSE, 0);
server_put(srv);
}
}
static BOOL client_init(struct client *cli, struct server *srv, HANDLE pipe)
{
trace("client_init(%p, %p, %p)\n", cli, srv, pipe);
check_server_obj(srv);
cli->magic = CLIENT_OBJ_MAGIC;
cli->refcount = 1;
list_init(&cli->list);
list_init(&cli->list_retry_io);
list_init(&cli->pipe_tx_queue);
slist_init(&cli->slist_closing);
slist_init(&cli->slist_retrying);
cli->srv = server_get(srv);
cli->next_io_retry_at = 0;
cli->retry_flags = 0;
cli->is_connected = 0;
cli->read_pending = IOSTATE_IDLE;
cli->required_room = 1;
cli->pipe = pipe;
memset(&cli->pipe_connect_ov, 0, sizeof(cli->pipe_connect_ov));
memset(&cli->pipe_read_ov, 0, sizeof(cli->pipe_read_ov));
memset(&cli->pipe_write_ov, 0, sizeof(cli->pipe_write_ov));
memset(&cli->pipe2socket, 0, sizeof(cli->pipe2socket));
list_init(&cli->pipe2socket.list);
cli->readbuf.prod = 0;
cli->readbuf.cons = 0;
if (!server_register_handle(srv, pipe, (ULONG_PTR)cli)) {
client_put(cli);
return FALSE;
}
client_add_to_list(cli);
return TRUE;
}
static DWORD client_start_connect(struct client *cli)
{
DWORD err;
BOOL res;
trace("client_start_connect(%p)\n", cli);
retry:
check_client_obj(cli);
client_cancel_retry(cli, RETRY_READ);
if (list_empty(&cli->list) || cli->is_connected)
return ERROR_SUCCESS;
if (cli->read_pending != IOSTATE_IDLE)
return ERROR_MORE_DATA;
client_get(cli);
cli->read_pending = IOSTATE_PENDING;
err = 0;
memset(&cli->pipe_connect_ov, 0, sizeof(cli->pipe_connect_ov));
res = ConnectNamedPipe(cli->pipe, &cli->pipe_connect_ov);
if (!res && (err = GetLastError()) == ERROR_IO_PENDING) {
cli->srv->params.open_mode &= ~FILE_FLAG_FIRST_PIPE_INSTANCE;
return ERROR_IO_PENDING;
}
if (res)
cli->srv->params.open_mode &= ~FILE_FLAG_FIRST_PIPE_INSTANCE;
if (!res || !IOCP_USED) {
err = on_client_connect(cli, err);
if (err == ERROR_RETRY)
goto retry;
}
return res;
}
static DWORD server_listen_for_next_client(struct server *srv)
{
struct client *cli;
HANDLE pipe;
DWORD err;
trace("server_listen_for_next_client(%p)\n", srv);
check_server_obj(srv);
if (!server_is_accepting_clients(srv, 1))
return ERROR_MORE_DATA;
SetLastError(ERROR_NOT_ENOUGH_MEMORY);
cli = client_alloc();
if (!cli)
return GetLastError();
pipe = CreateNamedPipeW(
srv->params.name,
srv->params.open_mode | FILE_FLAG_OVERLAPPED,
srv->params.pipe_mode,
srv->params.max_instances,
srv->params.out_buffer_size,
srv->params.in_buffer_size,
srv->params.default_timeout,
srv->params.security_attributes
);
if (pipe == INVALID_HANDLE_VALUE) {
err = GetLastError();
client_free(cli);
return err;
}
if (!client_init(cli, srv, pipe)) {
err = GetLastError();
CloseHandle(pipe);
client_free(cli);
return err;
}
return update_client(cli, FALSE, 0);
}
static DWORD server_listen(struct server *srv)
{
DWORD err;
while ((err = server_listen_for_next_client(srv)) == ERROR_SUCCESS)
;
return err == ERROR_MORE_DATA ? 0 : err;
}
static DWORD on_client_connect(struct client *cli, DWORD err)
{
trace("on_client_connect(%p, %lu)\n", cli, err);
check_client_obj(cli);
if (err) {
client_handle_error(cli, err, RETRY_READ, 1000);
client_put(cli);
return err;
}
cli->read_pending = IOSTATE_IDLE;
client_set_connected(cli, TRUE);
update_server(cli->srv, FALSE, 0);
update_client(cli, FALSE, RETRY_READ);
client_put(cli);
return ERROR_RETRY;
}
static DWORD server_start_write(struct server *srv)
{
int res;
DWORD err;
DWORD nsent;
struct socket_tx *item;
trace("server_start_write(%p)\n", srv);
retry:
check_server_obj(srv);
if (srv->state == SERVER_TERMINATING)
return ERROR_SUCCESS;
if (list_empty(&srv->socket_tx_queue))
return ERROR_MORE_DATA;
item = CONTAINING_RECORD(list_first(&srv->socket_tx_queue), struct socket_tx, list);
if (item->state != IOSTATE_IDLE)
return ERROR_MORE_DATA;
item->state = IOSTATE_PENDING;
server_get(srv);
err = 0;
nsent = 0;
memset(&srv->sock_write_ov, 0, sizeof(srv->sock_write_ov));
res = WSASend(
srv->socket,
item->iovs + item->iovoff,
item->iovcnt - item->iovoff,
&nsent,
0,
&srv->sock_write_ov,
NULL
);
if (res && (err = WSAGetLastError()) == WSA_IO_PENDING)
return ERROR_IO_PENDING;
if (res || !IOCP_USED) {
err = on_server_write(srv, err, nsent);
if (err == ERROR_RETRY)
goto retry;
}
return err;
}
static DWORD on_server_write(struct server *srv, DWORD err, DWORD nsent)
{
struct socket_tx *item;
struct client *cli;
trace("on_server_write(%p, %lu, %lu)\n", srv, err, nsent);
check_server_obj(srv);
if (srv->state == SERVER_TERMINATING)
err = WSAESHUTDOWN;
if (list_empty(&srv->socket_tx_queue)) {
server_put(srv);
return ERROR_MORE_DATA;
}
item = CONTAINING_RECORD(list_first(&srv->socket_tx_queue), struct socket_tx, list);
assert(item->state != IOSTATE_IDLE);
item->state = IOSTATE_IDLE;