/* * * 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. * */ /* FIXME: "posix" files shouldn't be depending on _GNU_SOURCE */ #ifndef _GNU_SOURCE #define _GNU_SOURCE #endif #include "src/core/lib/iomgr/port.h" #ifdef GRPC_POSIX_SOCKET #include "src/core/lib/iomgr/udp_server.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "src/core/lib/iomgr/error.h" #include "src/core/lib/iomgr/ev_posix.h" #include "src/core/lib/iomgr/resolve_address.h" #include "src/core/lib/iomgr/sockaddr.h" #include "src/core/lib/iomgr/sockaddr_utils.h" #include "src/core/lib/iomgr/socket_utils_posix.h" #include "src/core/lib/iomgr/unix_sockets_posix.h" #include "src/core/lib/support/string.h" /* one listening port */ typedef struct grpc_udp_listener grpc_udp_listener; struct grpc_udp_listener { int fd; grpc_fd *emfd; grpc_udp_server *server; grpc_resolved_address addr; grpc_closure read_closure; grpc_closure destroyed_closure; grpc_udp_server_read_cb read_cb; grpc_udp_server_orphan_cb orphan_cb; struct grpc_udp_listener *next; }; /* the overall server */ struct grpc_udp_server { gpr_mu mu; /* active port count: how many ports are actually still listening */ size_t active_ports; /* destroyed port count: how many ports are completely destroyed */ size_t destroyed_ports; /* is this server shutting down? (boolean) */ int shutdown; /* linked list of server ports */ grpc_udp_listener *head; grpc_udp_listener *tail; unsigned nports; /* shutdown callback */ grpc_closure *shutdown_complete; /* all pollsets interested in new connections */ grpc_pollset **pollsets; /* number of pollsets in the pollsets array */ size_t pollset_count; /* The parent grpc server */ grpc_server *grpc_server; }; grpc_udp_server *grpc_udp_server_create(void) { grpc_udp_server *s = gpr_malloc(sizeof(grpc_udp_server)); gpr_mu_init(&s->mu); s->active_ports = 0; s->destroyed_ports = 0; s->shutdown = 0; s->head = NULL; s->tail = NULL; s->nports = 0; return s; } static void finish_shutdown(grpc_exec_ctx *exec_ctx, grpc_udp_server *s) { if (s->shutdown_complete != NULL) { grpc_closure_sched(exec_ctx, s->shutdown_complete, GRPC_ERROR_NONE); } gpr_mu_destroy(&s->mu); while (s->head) { grpc_udp_listener *sp = s->head; s->head = sp->next; gpr_free(sp); } gpr_free(s); } static void destroyed_port(grpc_exec_ctx *exec_ctx, void *server, grpc_error *error) { grpc_udp_server *s = server; gpr_mu_lock(&s->mu); s->destroyed_ports++; if (s->destroyed_ports == s->nports) { gpr_mu_unlock(&s->mu); finish_shutdown(exec_ctx, s); } else { gpr_mu_unlock(&s->mu); } } /* called when all listening endpoints have been shutdown, so no further events will be received on them - at this point it's safe to destroy things */ static void deactivated_all_ports(grpc_exec_ctx *exec_ctx, grpc_udp_server *s) { /* delete ALL the things */ gpr_mu_lock(&s->mu); if (!s->shutdown) { gpr_mu_unlock(&s->mu); return; } if (s->head) { grpc_udp_listener *sp; for (sp = s->head; sp; sp = sp->next) { grpc_unlink_if_unix_domain_socket(&sp->addr); grpc_closure_init(&sp->destroyed_closure, destroyed_port, s, grpc_schedule_on_exec_ctx); /* Call the orphan_cb to signal that the FD is about to be closed and * should no longer be used. */ GPR_ASSERT(sp->orphan_cb); sp->orphan_cb(sp->emfd); grpc_fd_orphan(exec_ctx, sp->emfd, &sp->destroyed_closure, NULL, "udp_listener_shutdown"); } gpr_mu_unlock(&s->mu); } else { gpr_mu_unlock(&s->mu); finish_shutdown(exec_ctx, s); } } void grpc_udp_server_destroy(grpc_exec_ctx *exec_ctx, grpc_udp_server *s, grpc_closure *on_done) { grpc_udp_listener *sp; gpr_mu_lock(&s->mu); GPR_ASSERT(!s->shutdown); s->shutdown = 1; s->shutdown_complete = on_done; /* shutdown all fd's */ if (s->active_ports) { for (sp = s->head; sp; sp = sp->next) { GPR_ASSERT(sp->orphan_cb); sp->orphan_cb(sp->emfd); grpc_fd_shutdown(exec_ctx, sp->emfd); } gpr_mu_unlock(&s->mu); } else { gpr_mu_unlock(&s->mu); deactivated_all_ports(exec_ctx, s); } } /* Prepare a recently-created socket for listening. */ static int prepare_socket(int fd, const grpc_resolved_address *addr) { grpc_resolved_address sockname_temp; struct sockaddr *addr_ptr = (struct sockaddr *)addr->addr; /* Set send/receive socket buffers to 1 MB */ int buffer_size_bytes = 1024 * 1024; if (fd < 0) { goto error; } if (grpc_set_socket_nonblocking(fd, 1) != GRPC_ERROR_NONE) { gpr_log(GPR_ERROR, "Unable to set nonblocking %d: %s", fd, strerror(errno)); goto error; } if (grpc_set_socket_cloexec(fd, 1) != GRPC_ERROR_NONE) { gpr_log(GPR_ERROR, "Unable to set cloexec %d: %s", fd, strerror(errno)); goto error; } if (grpc_set_socket_ip_pktinfo_if_possible(fd) != GRPC_ERROR_NONE) { gpr_log(GPR_ERROR, "Unable to set ip_pktinfo."); goto error; } else if (addr_ptr->sa_family == AF_INET6) { if (grpc_set_socket_ipv6_recvpktinfo_if_possible(fd) != GRPC_ERROR_NONE) { gpr_log(GPR_ERROR, "Unable to set ipv6_recvpktinfo."); goto error; } } GPR_ASSERT(addr->len < ~(socklen_t)0); if (bind(fd, (struct sockaddr *)addr, (socklen_t)addr->len) < 0) { char *addr_str; grpc_sockaddr_to_string(&addr_str, addr, 0); gpr_log(GPR_ERROR, "bind addr=%s: %s", addr_str, strerror(errno)); gpr_free(addr_str); goto error; } sockname_temp.len = sizeof(struct sockaddr_storage); if (getsockname(fd, (struct sockaddr *)sockname_temp.addr, (socklen_t *)&sockname_temp.len) < 0) { goto error; } if (grpc_set_socket_sndbuf(fd, buffer_size_bytes) != GRPC_ERROR_NONE) { gpr_log(GPR_ERROR, "Failed to set send buffer size to %d bytes", buffer_size_bytes); goto error; } if (grpc_set_socket_rcvbuf(fd, buffer_size_bytes) != GRPC_ERROR_NONE) { gpr_log(GPR_ERROR, "Failed to set receive buffer size to %d bytes", buffer_size_bytes); goto error; } return grpc_sockaddr_get_port(&sockname_temp); error: if (fd >= 0) { close(fd); } return -1; } /* event manager callback when reads are ready */ static void on_read(grpc_exec_ctx *exec_ctx, void *arg, grpc_error *error) { grpc_udp_listener *sp = arg; gpr_mu_lock(&sp->server->mu); if (error != GRPC_ERROR_NONE) { if (0 == --sp->server->active_ports) { gpr_mu_unlock(&sp->server->mu); deactivated_all_ports(exec_ctx, sp->server); } else { gpr_mu_unlock(&sp->server->mu); } return; } /* Tell the registered callback that data is available to read. */ GPR_ASSERT(sp->read_cb); sp->read_cb(exec_ctx, sp->emfd, sp->server->grpc_server); /* Re-arm the notification event so we get another chance to read. */ grpc_fd_notify_on_read(exec_ctx, sp->emfd, &sp->read_closure); gpr_mu_unlock(&sp->server->mu); } static int add_socket_to_server(grpc_udp_server *s, int fd, const grpc_resolved_address *addr, grpc_udp_server_read_cb read_cb, grpc_udp_server_orphan_cb orphan_cb) { grpc_udp_listener *sp; int port; char *addr_str; char *name; port = prepare_socket(fd, addr); if (port >= 0) { grpc_sockaddr_to_string(&addr_str, addr, 1); gpr_asprintf(&name, "udp-server-listener:%s", addr_str); gpr_free(addr_str); gpr_mu_lock(&s->mu); s->nports++; sp = gpr_malloc(sizeof(grpc_udp_listener)); sp->next = NULL; if (s->head == NULL) { s->head = sp; } else { s->tail->next = sp; } s->tail = sp; sp->server = s; sp->fd = fd; sp->emfd = grpc_fd_create(fd, name); memcpy(&sp->addr, addr, sizeof(grpc_resolved_address)); sp->read_cb = read_cb; sp->orphan_cb = orphan_cb; GPR_ASSERT(sp->emfd); gpr_mu_unlock(&s->mu); gpr_free(name); } return port; } int grpc_udp_server_add_port(grpc_udp_server *s, const grpc_resolved_address *addr, grpc_udp_server_read_cb read_cb, grpc_udp_server_orphan_cb orphan_cb) { grpc_udp_listener *sp; int allocated_port1 = -1; int allocated_port2 = -1; int fd; grpc_dualstack_mode dsmode; grpc_resolved_address addr6_v4mapped; grpc_resolved_address wild4; grpc_resolved_address wild6; grpc_resolved_address addr4_copy; grpc_resolved_address *allocated_addr = NULL; grpc_resolved_address sockname_temp; 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 (sp = s->head; sp; sp = sp->next) { sockname_temp.len = sizeof(struct sockaddr_storage); if (0 == getsockname(sp->fd, (struct sockaddr *)sockname_temp.addr, (socklen_t *)&sockname_temp.len)) { port = grpc_sockaddr_get_port(&sockname_temp); if (port > 0) { allocated_addr = gpr_malloc(sizeof(grpc_resolved_address)); memcpy(allocated_addr, addr, sizeof(grpc_resolved_address)); grpc_sockaddr_set_port(allocated_addr, port); addr = allocated_addr; break; } } } } if (grpc_sockaddr_to_v4mapped(addr, &addr6_v4mapped)) { addr = &addr6_v4mapped; } /* Treat :: or 0.0.0.0 as a family-agnostic wildcard. */ if (grpc_sockaddr_is_wildcard(addr, &port)) { grpc_sockaddr_make_wildcards(port, &wild4, &wild6); /* Try listening on IPv6 first. */ addr = &wild6; // TODO(rjshade): Test and propagate the returned grpc_error*: GRPC_ERROR_UNREF(grpc_create_dualstack_socket(addr, SOCK_DGRAM, IPPROTO_UDP, &dsmode, &fd)); allocated_port1 = add_socket_to_server(s, fd, addr, read_cb, orphan_cb); if (fd >= 0 && dsmode == GRPC_DSMODE_DUALSTACK) { goto done; } /* If we didn't get a dualstack socket, also listen on 0.0.0.0. */ if (port == 0 && allocated_port1 > 0) { grpc_sockaddr_set_port(&wild4, allocated_port1); } addr = &wild4; } // TODO(rjshade): Test and propagate the returned grpc_error*: GRPC_ERROR_UNREF(grpc_create_dualstack_socket(addr, SOCK_DGRAM, IPPROTO_UDP, &dsmode, &fd)); if (fd < 0) { gpr_log(GPR_ERROR, "Unable to create socket: %s", strerror(errno)); } if (dsmode == GRPC_DSMODE_IPV4 && grpc_sockaddr_is_v4mapped(addr, &addr4_copy)) { addr = &addr4_copy; } allocated_port2 = add_socket_to_server(s, fd, addr, read_cb, orphan_cb); done: gpr_free(allocated_addr); return allocated_port1 >= 0 ? allocated_port1 : allocated_port2; } int grpc_udp_server_get_fd(grpc_udp_server *s, unsigned port_index) { grpc_udp_listener *sp; if (port_index >= s->nports) { return -1; } for (sp = s->head; sp && port_index != 0; sp = sp->next) { --port_index; } return sp->fd; } void grpc_udp_server_start(grpc_exec_ctx *exec_ctx, grpc_udp_server *s, grpc_pollset **pollsets, size_t pollset_count, grpc_server *server) { size_t i; gpr_mu_lock(&s->mu); grpc_udp_listener *sp; GPR_ASSERT(s->active_ports == 0); s->pollsets = pollsets; s->grpc_server = server; sp = s->head; while (sp != NULL) { for (i = 0; i < pollset_count; i++) { grpc_pollset_add_fd(exec_ctx, pollsets[i], sp->emfd); } grpc_closure_init(&sp->read_closure, on_read, sp, grpc_schedule_on_exec_ctx); grpc_fd_notify_on_read(exec_ctx, sp->emfd, &sp->read_closure); s->active_ports++; sp = sp->next; } gpr_mu_unlock(&s->mu); } #endif