| /* |
| * |
| * 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 <errno.h> |
| #include <fcntl.h> |
| #include <limits.h> |
| #include <netinet/in.h> |
| #include <netinet/tcp.h> |
| #include <string.h> |
| #include <sys/socket.h> |
| #include <sys/stat.h> |
| #include <sys/types.h> |
| #include <unistd.h> |
| |
| #include <grpc/grpc.h> |
| #include <grpc/support/alloc.h> |
| #include <grpc/support/log.h> |
| #include <grpc/support/string_util.h> |
| #include <grpc/support/sync.h> |
| #include <grpc/support/time.h> |
| #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 write_closure; |
| grpc_closure destroyed_closure; |
| grpc_udp_server_read_cb read_cb; |
| grpc_udp_server_write_cb write_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; |
| /* opaque object to pass to callbacks */ |
| void *user_data; |
| }; |
| |
| 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(exec_ctx, sp->emfd, sp->server->user_data); |
| |
| 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(exec_ctx, sp->emfd, sp->server->user_data); |
| grpc_fd_shutdown(exec_ctx, sp->emfd, |
| GRPC_ERROR_CREATE("Server destroyed")); |
| } |
| 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->user_data); |
| |
| /* 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 void on_write(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 the socket is writeable. */ |
| GPR_ASSERT(sp->write_cb); |
| sp->write_cb(exec_ctx, sp->emfd, sp->server->user_data); |
| |
| /* Re-arm the notification event so we get another chance to write. */ |
| grpc_fd_notify_on_write(exec_ctx, sp->emfd, &sp->write_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_write_cb write_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->write_cb = write_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_write_cb write_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, write_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, write_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, |
| void *user_data) { |
| size_t i; |
| gpr_mu_lock(&s->mu); |
| grpc_udp_listener *sp; |
| GPR_ASSERT(s->active_ports == 0); |
| s->pollsets = pollsets; |
| s->user_data = user_data; |
| |
| 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); |
| |
| grpc_closure_init(&sp->write_closure, on_write, sp, |
| grpc_schedule_on_exec_ctx); |
| grpc_fd_notify_on_write(exec_ctx, sp->emfd, &sp->write_closure); |
| |
| /* Registered for both read and write callbacks: increment active_ports |
| * twice to account for this, and delay free-ing of memory until both |
| * on_read and on_write have fired. */ |
| s->active_ports += 2; |
| |
| sp = sp->next; |
| } |
| |
| gpr_mu_unlock(&s->mu); |
| } |
| |
| #endif |