diff options
Diffstat (limited to 'src/core/lib/iomgr/udp_server.c')
| -rw-r--r-- | src/core/lib/iomgr/udp_server.c | 411 |
1 files changed, 411 insertions, 0 deletions
diff --git a/src/core/lib/iomgr/udp_server.c b/src/core/lib/iomgr/udp_server.c new file mode 100644 index 0000000000..9068109c3a --- /dev/null +++ b/src/core/lib/iomgr/udp_server.c @@ -0,0 +1,411 @@ +/* + * + * Copyright 2015-2016, 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/fd_posix.h" +#include "src/core/lib/iomgr/pollset_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/iomgr/unix_sockets_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 = 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 |