/* * * 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 #ifdef GPR_POSIX_SOCKET #include "src/core/iomgr/udp_server.h" #include #include #include #include #include #include #include #include #include #include #include #include "src/core/iomgr/fd_posix.h" #include "src/core/iomgr/pollset_posix.h" #include "src/core/iomgr/resolve_address.h" #include "src/core/iomgr/sockaddr_utils.h" #include "src/core/iomgr/socket_utils_posix.h" #include "src/core/support/string.h" #include #include #include #include #include #define INIT_PORT_CAP 2 /* one listening port */ typedef struct { int fd; grpc_fd *emfd; grpc_udp_server *server; union { gpr_uint8 untyped[GRPC_MAX_SOCKADDR_SIZE]; struct sockaddr sockaddr; struct sockaddr_un un; } addr; int addr_len; grpc_iomgr_closure read_closure; grpc_iomgr_closure destroyed_closure; grpc_udp_server_read_cb read_cb; } server_port; static void unlink_if_unix_domain_socket(const struct sockaddr_un *un) { struct stat st; if (stat(un->sun_path, &st) == 0 && (st.st_mode & S_IFMT) == S_IFSOCK) { unlink(un->sun_path); } } /* the overall server */ struct grpc_udp_server { grpc_udp_server_cb cb; void *cb_arg; 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 */ void (*shutdown_complete)(void *); void *shutdown_complete_arg; /* all pollsets interested in new connections */ grpc_pollset **pollsets; /* number of pollsets in the pollsets array */ size_t pollset_count; }; 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->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; } static void finish_shutdown(grpc_udp_server *s) { s->shutdown_complete(s->shutdown_complete_arg); gpr_mu_destroy(&s->mu); gpr_cv_destroy(&s->cv); gpr_free(s->ports); gpr_free(s); } static void destroyed_port(void *server, int 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(s); } else { gpr_mu_unlock(&s->mu); } } static void dont_care_about_shutdown_completion(void *ignored) {} /* 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_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]; if (sp->addr.sockaddr.sa_family == AF_UNIX) { unlink_if_unix_domain_socket(&sp->addr.un); } sp->destroyed_closure.cb = destroyed_port; sp->destroyed_closure.cb_arg = s; grpc_fd_orphan(sp->emfd, &sp->destroyed_closure, "udp_listener_shutdown"); } gpr_mu_unlock(&s->mu); } else { gpr_mu_unlock(&s->mu); finish_shutdown(s); } } void grpc_udp_server_destroy( grpc_udp_server *s, void (*shutdown_complete)(void *shutdown_complete_arg), void *shutdown_complete_arg) { size_t i; gpr_mu_lock(&s->mu); GPR_ASSERT(!s->shutdown); s->shutdown = 1; s->shutdown_complete = shutdown_complete ? shutdown_complete : dont_care_about_shutdown_completion; s->shutdown_complete_arg = shutdown_complete_arg; /* shutdown all fd's */ if (s->active_ports) { for (i = 0; i < s->nports; i++) { grpc_fd_shutdown(s->ports[i].emfd); } gpr_mu_unlock(&s->mu); } else { gpr_mu_unlock(&s->mu); deactivated_all_ports(s); } } /* Prepare a recently-created socket for listening. */ static int prepare_socket(int fd, const struct sockaddr *addr, int addr_len) { struct sockaddr_storage sockname_temp; socklen_t sockname_len; int get_local_ip; int rc; if (fd < 0) { goto error; } get_local_ip = 1; rc = setsockopt(fd, IPPROTO_IP, IP_PKTINFO, &get_local_ip, sizeof(get_local_ip)); if (rc == 0 && addr->sa_family == AF_INET6) { rc = setsockopt(fd, IPPROTO_IPV6, IPV6_RECVPKTINFO, &get_local_ip, sizeof(get_local_ip)); } if (bind(fd, addr, 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(void *arg, int success) { server_port *sp = arg; if (success == 0) { gpr_mu_lock(&sp->server->mu); if (0 == --sp->server->active_ports) { gpr_mu_unlock(&sp->server->mu); deactivated_all_ports(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(sp->fd, sp->server->cb, sp->server->cb_arg); /* Re-arm the notification event so we get another chance to read. */ grpc_fd_notify_on_read(sp->emfd, &sp->read_closure); } static int add_socket_to_server(grpc_udp_server *s, int fd, const struct sockaddr *addr, int 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_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->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); } return port; } int grpc_udp_server_add_port(grpc_udp_server *s, const void *addr, int 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; if (((struct sockaddr *)addr)->sa_family == AF_UNIX) { unlink_if_unix_domain_socket(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 index) { return (index < s->nports) ? s->ports[index].fd : -1; } void grpc_udp_server_start(grpc_udp_server *s, grpc_pollset **pollsets, size_t pollset_count, grpc_udp_server_cb new_transport_cb, void *cb_arg) { size_t i, j; GPR_ASSERT(new_transport_cb); gpr_mu_lock(&s->mu); GPR_ASSERT(!s->cb); GPR_ASSERT(s->active_ports == 0); s->cb = new_transport_cb; s->cb_arg = cb_arg; s->pollsets = pollsets; for (i = 0; i < s->nports; i++) { for (j = 0; j < pollset_count; j++) { grpc_pollset_add_fd(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(s->ports[i].emfd, &s->ports[i].read_closure); s->active_ports++; } gpr_mu_unlock(&s->mu); } /* TODO(rjshade): Add a test for this method. */ void grpc_udp_server_write(server_port *sp, const char *buffer, size_t buf_len, const struct sockaddr *peer_address) { int rc; rc = sendto(sp->fd, buffer, buf_len, 0, peer_address, sizeof(peer_address)); if (rc < 0) { gpr_log(GPR_ERROR, "Unable to send data: %s", strerror(errno)); } } #endif