| /* |
| * |
| * 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 <grpc/support/port_platform.h> |
| |
| #ifdef GRPC_NEED_UDP |
| #ifdef GPR_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/ev_posix.h" |
| #include "src/core/lib/iomgr/resolve_address.h" |
| #include "src/core/lib/iomgr/sockaddr_utils.h" |
| #include "src/core/lib/iomgr/socket_utils_posix.h" |
| #include "src/core/lib/support/string.h" |
| |
| #define INIT_PORT_CAP 2 |
| |
| /* one listening port */ |
| typedef struct { |
| int fd; |
| grpc_fd *emfd; |
| grpc_udp_server *server; |
| union { |
| uint8_t untyped[GRPC_MAX_SOCKADDR_SIZE]; |
| struct sockaddr sockaddr; |
| } addr; |
| size_t addr_len; |
| grpc_closure read_closure; |
| grpc_closure destroyed_closure; |
| grpc_udp_server_read_cb read_cb; |
| } server_port; |
| |
| /* the overall server */ |
| struct grpc_udp_server { |
| gpr_mu mu; |
| gpr_cv cv; |
| |
| /* 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; |
| |
| /* all listening ports */ |
| server_port *ports; |
| size_t nports; |
| size_t port_capacity; |
| |
| /* 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); |
| gpr_cv_init(&s->cv); |
| s->active_ports = 0; |
| s->destroyed_ports = 0; |
| s->shutdown = 0; |
| s->ports = gpr_malloc(sizeof(server_port) * INIT_PORT_CAP); |
| s->nports = 0; |
| s->port_capacity = INIT_PORT_CAP; |
| |
| return s; |
| } |
| |
| static void finish_shutdown(grpc_exec_ctx *exec_ctx, grpc_udp_server *s) { |
| grpc_exec_ctx_enqueue(exec_ctx, s->shutdown_complete, 1, NULL); |
| |
| gpr_mu_destroy(&s->mu); |
| gpr_cv_destroy(&s->cv); |
| |
| gpr_free(s->ports); |
| gpr_free(s); |
| } |
| |
| static void destroyed_port(grpc_exec_ctx *exec_ctx, void *server, |
| bool success) { |
| 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) { |
| size_t i; |
| |
| /* delete ALL the things */ |
| gpr_mu_lock(&s->mu); |
| |
| if (!s->shutdown) { |
| gpr_mu_unlock(&s->mu); |
| return; |
| } |
| |
| if (s->nports) { |
| for (i = 0; i < s->nports; i++) { |
| server_port *sp = &s->ports[i]; |
| grpc_unlink_if_unix_domain_socket(&sp->addr.sockaddr); |
| sp->destroyed_closure.cb = destroyed_port; |
| sp->destroyed_closure.cb_arg = s; |
| 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) { |
| size_t i; |
| 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 (i = 0; i < s->nports; i++) { |
| grpc_fd_shutdown(exec_ctx, s->ports[i].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 struct sockaddr *addr, |
| size_t addr_len) { |
| struct sockaddr_storage sockname_temp; |
| socklen_t sockname_len; |
| |
| if (fd < 0) { |
| goto error; |
| } |
| |
| if (!grpc_set_socket_nonblocking(fd, 1) || !grpc_set_socket_cloexec(fd, 1)) { |
| gpr_log(GPR_ERROR, "Unable to configure socket %d: %s", fd, |
| strerror(errno)); |
| } |
| |
| if (grpc_set_socket_ip_pktinfo_if_possible(fd) && |
| addr->sa_family == AF_INET6) { |
| grpc_set_socket_ipv6_recvpktinfo_if_possible(fd); |
| } |
| |
| GPR_ASSERT(addr_len < ~(socklen_t)0); |
| if (bind(fd, 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_len = sizeof(sockname_temp); |
| if (getsockname(fd, (struct sockaddr *)&sockname_temp, &sockname_len) < 0) { |
| goto error; |
| } |
| |
| return grpc_sockaddr_get_port((struct sockaddr *)&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, bool success) { |
| server_port *sp = arg; |
| |
| if (!success) { |
| gpr_mu_lock(&sp->server->mu); |
| 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); |
| } |
| |
| static int add_socket_to_server(grpc_udp_server *s, int fd, |
| const struct sockaddr *addr, size_t addr_len, |
| grpc_udp_server_read_cb read_cb) { |
| server_port *sp; |
| int port; |
| char *addr_str; |
| char *name; |
| |
| port = prepare_socket(fd, addr, addr_len); |
| if (port >= 0) { |
| grpc_sockaddr_to_string(&addr_str, (struct sockaddr *)&addr, 1); |
| gpr_asprintf(&name, "udp-server-listener:%s", addr_str); |
| gpr_free(addr_str); |
| gpr_mu_lock(&s->mu); |
| /* 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->fd = fd; |
| sp->emfd = grpc_fd_create(fd, name); |
| memcpy(sp->addr.untyped, addr, addr_len); |
| sp->addr_len = addr_len; |
| sp->read_cb = read_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 void *addr, |
| size_t addr_len, grpc_udp_server_read_cb read_cb) { |
| int allocated_port1 = -1; |
| int allocated_port2 = -1; |
| unsigned i; |
| int fd; |
| grpc_dualstack_mode dsmode; |
| struct sockaddr_in6 addr6_v4mapped; |
| struct sockaddr_in wild4; |
| struct sockaddr_in6 wild6; |
| struct sockaddr_in addr4_copy; |
| struct sockaddr *allocated_addr = NULL; |
| struct sockaddr_storage sockname_temp; |
| socklen_t sockname_len; |
| int port; |
| |
| grpc_unlink_if_unix_domain_socket((struct sockaddr *)addr); |
| |
| /* 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].fd, (struct sockaddr *)&sockname_temp, |
| &sockname_len)) { |
| port = grpc_sockaddr_get_port((struct sockaddr *)&sockname_temp); |
| if (port > 0) { |
| allocated_addr = gpr_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_wildcards(port, &wild4, &wild6); |
| |
| /* Try listening on IPv6 first. */ |
| addr = (struct sockaddr *)&wild6; |
| addr_len = sizeof(wild6); |
| fd = grpc_create_dualstack_socket(addr, SOCK_DGRAM, IPPROTO_UDP, &dsmode); |
| allocated_port1 = add_socket_to_server(s, fd, addr, addr_len, read_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((struct sockaddr *)&wild4, allocated_port1); |
| } |
| addr = (struct sockaddr *)&wild4; |
| addr_len = sizeof(wild4); |
| } |
| |
| fd = grpc_create_dualstack_socket(addr, SOCK_DGRAM, IPPROTO_UDP, &dsmode); |
| 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 = (struct sockaddr *)&addr4_copy; |
| addr_len = sizeof(addr4_copy); |
| } |
| allocated_port2 = add_socket_to_server(s, fd, addr, addr_len, read_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) { |
| return (port_index < s->nports) ? s->ports[port_index].fd : -1; |
| } |
| |
| 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, j; |
| gpr_mu_lock(&s->mu); |
| GPR_ASSERT(s->active_ports == 0); |
| s->pollsets = pollsets; |
| s->grpc_server = server; |
| for (i = 0; i < s->nports; i++) { |
| for (j = 0; j < pollset_count; j++) { |
| grpc_pollset_add_fd(exec_ctx, pollsets[j], s->ports[i].emfd); |
| } |
| s->ports[i].read_closure.cb = on_read; |
| s->ports[i].read_closure.cb_arg = &s->ports[i]; |
| grpc_fd_notify_on_read(exec_ctx, s->ports[i].emfd, |
| &s->ports[i].read_closure); |
| s->active_ports++; |
| } |
| gpr_mu_unlock(&s->mu); |
| } |
| |
| #endif |
| #endif |