| /* |
| * |
| * Copyright 2015, Google Inc. |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are |
| * met: |
| * |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * * 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. |
| * * Neither the name of Google Inc. nor the names of its |
| * contributors may be used to endorse or promote products derived from |
| * this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "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 COPYRIGHT |
| * OWNER OR CONTRIBUTORS 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 <grpc/support/port_platform.h> |
| |
| #ifdef GPR_WINSOCK_SOCKET |
| |
| #define _GNU_SOURCE |
| #include "src/core/iomgr/sockaddr_utils.h" |
| |
| #include <grpc/support/alloc.h> |
| #include <grpc/support/log.h> |
| #include <grpc/support/log_win32.h> |
| #include <grpc/support/sync.h> |
| #include <grpc/support/time.h> |
| |
| #include "src/core/iomgr/iocp_windows.h" |
| #include "src/core/iomgr/pollset_windows.h" |
| #include "src/core/iomgr/socket_windows.h" |
| #include "src/core/iomgr/tcp_server.h" |
| #include "src/core/iomgr/tcp_windows.h" |
| |
| #define INIT_PORT_CAP 2 |
| #define MIN_SAFE_ACCEPT_QUEUE_SIZE 100 |
| |
| /* one listening port */ |
| typedef struct server_port { |
| /* This seemingly magic number comes from AcceptEx's documentation. each |
| address buffer needs to have at least 16 more bytes at their end. */ |
| gpr_uint8 addresses[(sizeof(struct sockaddr_in6) + 16) * 2]; |
| /* This will hold the socket for the next accept. */ |
| SOCKET new_socket; |
| /* The listener winsocked. */ |
| grpc_winsocket *socket; |
| grpc_tcp_server *server; |
| /* The cached AcceptEx for that port. */ |
| LPFN_ACCEPTEX AcceptEx; |
| int shutting_down; |
| } server_port; |
| |
| /* the overall server */ |
| struct grpc_tcp_server { |
| grpc_tcp_server_cb cb; |
| void *cb_arg; |
| |
| gpr_mu mu; |
| gpr_cv cv; |
| |
| /* active port count: how many ports are actually still listening */ |
| int active_ports; |
| |
| /* all listening ports */ |
| server_port *ports; |
| size_t nports; |
| size_t port_capacity; |
| }; |
| |
| /* Public function. Allocates the proper data structures to hold a |
| grpc_tcp_server. */ |
| grpc_tcp_server *grpc_tcp_server_create(void) { |
| grpc_tcp_server *s = gpr_malloc(sizeof(grpc_tcp_server)); |
| gpr_mu_init(&s->mu); |
| gpr_cv_init(&s->cv); |
| s->active_ports = 0; |
| s->cb = NULL; |
| s->cb_arg = NULL; |
| s->ports = gpr_malloc(sizeof(server_port) * INIT_PORT_CAP); |
| s->nports = 0; |
| s->port_capacity = INIT_PORT_CAP; |
| return s; |
| } |
| |
| /* Public function. Stops and destroys a grpc_tcp_server. */ |
| void grpc_tcp_server_destroy(grpc_tcp_server *s, |
| void (*shutdown_done)(void *shutdown_done_arg), |
| void *shutdown_done_arg) { |
| size_t i; |
| gpr_mu_lock(&s->mu); |
| /* First, shutdown all fd's. This will queue abortion calls for all |
| of the pending accepts. */ |
| for (i = 0; i < s->nports; i++) { |
| server_port *sp = &s->ports[i]; |
| grpc_winsocket_shutdown(sp->socket); |
| } |
| /* This happens asynchronously. Wait while that happens. */ |
| while (s->active_ports) { |
| gpr_cv_wait(&s->cv, &s->mu, gpr_inf_future); |
| } |
| gpr_mu_unlock(&s->mu); |
| |
| /* Now that the accepts have been aborted, we can destroy the sockets. |
| The IOCP won't get notified on these, so we can flag them as already |
| closed by the system. */ |
| for (i = 0; i < s->nports; i++) { |
| server_port *sp = &s->ports[i]; |
| sp->socket->closed_early = 1; |
| grpc_winsocket_orphan(sp->socket); |
| } |
| gpr_free(s->ports); |
| gpr_free(s); |
| |
| if (shutdown_done) { |
| shutdown_done(shutdown_done_arg); |
| } |
| } |
| |
| /* Prepare (bind) a recently-created socket for listening. */ |
| static int prepare_socket(SOCKET sock, const struct sockaddr *addr, |
| int addr_len) { |
| struct sockaddr_storage sockname_temp; |
| socklen_t sockname_len; |
| |
| if (sock == INVALID_SOCKET) goto error; |
| |
| if (!grpc_tcp_prepare_socket(sock)) { |
| char *utf8_message = gpr_format_message(WSAGetLastError()); |
| gpr_log(GPR_ERROR, "Unable to prepare socket: %s", utf8_message); |
| gpr_free(utf8_message); |
| goto error; |
| } |
| |
| if (bind(sock, addr, addr_len) == SOCKET_ERROR) { |
| char *addr_str; |
| char *utf8_message = gpr_format_message(WSAGetLastError()); |
| grpc_sockaddr_to_string(&addr_str, addr, 0); |
| gpr_log(GPR_ERROR, "bind addr=%s: %s", addr_str, utf8_message); |
| gpr_free(utf8_message); |
| gpr_free(addr_str); |
| goto error; |
| } |
| |
| if (listen(sock, SOMAXCONN) == SOCKET_ERROR) { |
| char *utf8_message = gpr_format_message(WSAGetLastError()); |
| gpr_log(GPR_ERROR, "listen: %s", utf8_message); |
| gpr_free(utf8_message); |
| goto error; |
| } |
| |
| sockname_len = sizeof(sockname_temp); |
| if (getsockname(sock, (struct sockaddr *)&sockname_temp, &sockname_len) == |
| SOCKET_ERROR) { |
| char *utf8_message = gpr_format_message(WSAGetLastError()); |
| gpr_log(GPR_ERROR, "getsockname: %s", utf8_message); |
| gpr_free(utf8_message); |
| goto error; |
| } |
| |
| return grpc_sockaddr_get_port((struct sockaddr *)&sockname_temp); |
| |
| error: |
| if (sock != INVALID_SOCKET) closesocket(sock); |
| return -1; |
| } |
| |
| /* start_accept will reference that for the IOCP notification request. */ |
| static void on_accept(void *arg, int from_iocp); |
| |
| /* In order to do an async accept, we need to create a socket first which |
| will be the one assigned to the new incoming connection. */ |
| static void start_accept(server_port *port) { |
| SOCKET sock = INVALID_SOCKET; |
| char *message; |
| char *utf8_message; |
| BOOL success; |
| DWORD addrlen = sizeof(struct sockaddr_in6) + 16; |
| DWORD bytes_received = 0; |
| |
| sock = WSASocket(AF_INET6, SOCK_STREAM, IPPROTO_TCP, NULL, 0, |
| WSA_FLAG_OVERLAPPED); |
| |
| if (sock == INVALID_SOCKET) { |
| message = "Unable to create socket: %s"; |
| goto failure; |
| } |
| |
| if (!grpc_tcp_prepare_socket(sock)) { |
| message = "Unable to prepare socket: %s"; |
| goto failure; |
| } |
| |
| /* Start the "accept" asynchronously. */ |
| success = port->AcceptEx(port->socket->socket, sock, port->addresses, 0, |
| addrlen, addrlen, &bytes_received, |
| &port->socket->read_info.overlapped); |
| |
| /* It is possible to get an accept immediately without delay. However, we |
| will still get an IOCP notification for it. So let's just ignore it. */ |
| if (!success) { |
| int error = WSAGetLastError(); |
| if (error != ERROR_IO_PENDING) { |
| message = "AcceptEx failed: %s"; |
| goto failure; |
| } |
| } |
| |
| /* We're ready to do the accept. Calling grpc_socket_notify_on_read may |
| immediately process an accept that happened in the meantime. */ |
| port->new_socket = sock; |
| grpc_socket_notify_on_read(port->socket, on_accept, port); |
| return; |
| |
| failure: |
| utf8_message = gpr_format_message(WSAGetLastError()); |
| gpr_log(GPR_ERROR, message, utf8_message); |
| gpr_free(utf8_message); |
| if (sock != INVALID_SOCKET) closesocket(sock); |
| } |
| |
| /* Event manager callback when reads are ready. */ |
| static void on_accept(void *arg, int from_iocp) { |
| server_port *sp = arg; |
| SOCKET sock = sp->new_socket; |
| grpc_winsocket_callback_info *info = &sp->socket->read_info; |
| grpc_endpoint *ep = NULL; |
| |
| /* The shutdown sequence is done in two parts. This is the second |
| part here, acknowledging the IOCP notification, and doing nothing |
| else, especially not queuing a new accept. */ |
| if (sp->shutting_down) { |
| GPR_ASSERT(from_iocp); |
| sp->shutting_down = 0; |
| gpr_mu_lock(&sp->server->mu); |
| if (0 == --sp->server->active_ports) { |
| gpr_cv_broadcast(&sp->server->cv); |
| } |
| gpr_mu_unlock(&sp->server->mu); |
| return; |
| } |
| |
| if (from_iocp) { |
| /* The IOCP notified us of a completed operation. Let's grab the results, |
| and act accordingly. */ |
| DWORD transfered_bytes = 0; |
| DWORD flags; |
| BOOL wsa_success = WSAGetOverlappedResult(sock, &info->overlapped, |
| &transfered_bytes, FALSE, &flags); |
| if (!wsa_success) { |
| char *utf8_message = gpr_format_message(WSAGetLastError()); |
| gpr_log(GPR_ERROR, "on_accept error: %s", utf8_message); |
| gpr_free(utf8_message); |
| closesocket(sock); |
| } else { |
| ep = grpc_tcp_create(grpc_winsocket_create(sock)); |
| } |
| } else { |
| /* If we're not notified from the IOCP, it means we are asked to shutdown. |
| This will initiate that shutdown. Calling closesocket will trigger an |
| IOCP notification, that will call this function a second time, from |
| the IOCP thread. Of course, this only works if the socket was, in fact, |
| listening. If that's not the case, we'd wait indefinitely. That's a bit |
| of a degenerate case, but it can happen if you create a server, but |
| don't start it. So let's support that by recursing once. */ |
| sp->shutting_down = 1; |
| sp->new_socket = INVALID_SOCKET; |
| if (sock != INVALID_SOCKET) { |
| closesocket(sock); |
| } else { |
| on_accept(sp, 1); |
| } |
| return; |
| } |
| |
| /* The only time we should call our callback, is where we successfully |
| managed to accept a connection, and created an endpoint. */ |
| if (ep) sp->server->cb(sp->server->cb_arg, ep); |
| /* As we were notified from the IOCP of one and exactly one accept, |
| the former socked we created has now either been destroy or assigned |
| to the new connection. We need to create a new one for the next |
| connection. */ |
| start_accept(sp); |
| } |
| |
| static int add_socket_to_server(grpc_tcp_server *s, SOCKET sock, |
| const struct sockaddr *addr, int addr_len) { |
| server_port *sp; |
| int port; |
| int status; |
| GUID guid = WSAID_ACCEPTEX; |
| DWORD ioctl_num_bytes; |
| LPFN_ACCEPTEX AcceptEx; |
| |
| if (sock == INVALID_SOCKET) return -1; |
| |
| /* We need to grab the AcceptEx pointer for that port, as it may be |
| interface-dependent. We'll cache it to avoid doing that again. */ |
| status = |
| WSAIoctl(sock, SIO_GET_EXTENSION_FUNCTION_POINTER, &guid, sizeof(guid), |
| &AcceptEx, sizeof(AcceptEx), &ioctl_num_bytes, NULL, NULL); |
| |
| if (status != 0) { |
| char *utf8_message = gpr_format_message(WSAGetLastError()); |
| gpr_log(GPR_ERROR, "on_connect error: %s", utf8_message); |
| gpr_free(utf8_message); |
| closesocket(sock); |
| return -1; |
| } |
| |
| port = prepare_socket(sock, addr, addr_len); |
| if (port >= 0) { |
| gpr_mu_lock(&s->mu); |
| GPR_ASSERT(!s->cb && "must add ports before starting server"); |
| /* append it to the list under a lock */ |
| if (s->nports == s->port_capacity) { |
| s->port_capacity *= 2; |
| s->ports = gpr_realloc(s->ports, sizeof(server_port) * s->port_capacity); |
| } |
| sp = &s->ports[s->nports++]; |
| sp->server = s; |
| sp->socket = grpc_winsocket_create(sock); |
| sp->shutting_down = 0; |
| sp->AcceptEx = AcceptEx; |
| sp->new_socket = INVALID_SOCKET; |
| GPR_ASSERT(sp->socket); |
| gpr_mu_unlock(&s->mu); |
| } |
| |
| return port; |
| } |
| |
| int grpc_tcp_server_add_port(grpc_tcp_server *s, const void *addr, |
| int addr_len) { |
| int allocated_port = -1; |
| unsigned i; |
| SOCKET sock; |
| struct sockaddr_in6 addr6_v4mapped; |
| struct sockaddr_in6 wildcard; |
| struct sockaddr *allocated_addr = NULL; |
| struct sockaddr_storage sockname_temp; |
| socklen_t sockname_len; |
| int port; |
| |
| /* Check if this is a wildcard port, and if so, try to keep the port the same |
| as some previously created listener. */ |
| if (grpc_sockaddr_get_port(addr) == 0) { |
| for (i = 0; i < s->nports; i++) { |
| sockname_len = sizeof(sockname_temp); |
| if (0 == getsockname(s->ports[i].socket->socket, |
| (struct sockaddr *)&sockname_temp, &sockname_len)) { |
| port = grpc_sockaddr_get_port((struct sockaddr *)&sockname_temp); |
| if (port > 0) { |
| allocated_addr = malloc(addr_len); |
| memcpy(allocated_addr, addr, addr_len); |
| grpc_sockaddr_set_port(allocated_addr, port); |
| addr = allocated_addr; |
| break; |
| } |
| } |
| } |
| } |
| |
| if (grpc_sockaddr_to_v4mapped(addr, &addr6_v4mapped)) { |
| addr = (const struct sockaddr *)&addr6_v4mapped; |
| addr_len = sizeof(addr6_v4mapped); |
| } |
| |
| /* Treat :: or 0.0.0.0 as a family-agnostic wildcard. */ |
| if (grpc_sockaddr_is_wildcard(addr, &port)) { |
| grpc_sockaddr_make_wildcard6(port, &wildcard); |
| |
| addr = (struct sockaddr *)&wildcard; |
| addr_len = sizeof(wildcard); |
| } |
| |
| sock = WSASocket(AF_INET6, SOCK_STREAM, IPPROTO_TCP, NULL, 0, |
| WSA_FLAG_OVERLAPPED); |
| if (sock == INVALID_SOCKET) { |
| char *utf8_message = gpr_format_message(WSAGetLastError()); |
| gpr_log(GPR_ERROR, "unable to create socket: %s", utf8_message); |
| gpr_free(utf8_message); |
| } |
| |
| allocated_port = add_socket_to_server(s, sock, addr, addr_len); |
| gpr_free(allocated_addr); |
| |
| return allocated_port; |
| } |
| |
| SOCKET grpc_tcp_server_get_socket(grpc_tcp_server *s, unsigned index) { |
| return (index < s->nports) ? s->ports[index].socket->socket : INVALID_SOCKET; |
| } |
| |
| void grpc_tcp_server_start(grpc_tcp_server *s, grpc_pollset **pollset, |
| size_t pollset_count, grpc_tcp_server_cb cb, |
| void *cb_arg) { |
| size_t i; |
| GPR_ASSERT(cb); |
| gpr_mu_lock(&s->mu); |
| GPR_ASSERT(!s->cb); |
| GPR_ASSERT(s->active_ports == 0); |
| s->cb = cb; |
| s->cb_arg = cb_arg; |
| for (i = 0; i < s->nports; i++) { |
| start_accept(s->ports + i); |
| s->active_ports++; |
| } |
| gpr_mu_unlock(&s->mu); |
| } |
| |
| #endif /* GPR_WINSOCK_SOCKET */ |