/* * * 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/tcp_server.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #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/tcp_posix.h" #include "src/core/lib/iomgr/unix_sockets_posix.h" #include "src/core/lib/support/string.h" #define MIN_SAFE_ACCEPT_QUEUE_SIZE 100 static gpr_once s_init_max_accept_queue_size; static int s_max_accept_queue_size; /* one listening port */ typedef struct grpc_tcp_listener grpc_tcp_listener; struct grpc_tcp_listener { int fd; grpc_fd *emfd; grpc_tcp_server *server; grpc_resolved_address addr; int port; unsigned port_index; unsigned fd_index; grpc_closure read_closure; grpc_closure destroyed_closure; struct grpc_tcp_listener *next; /* sibling is a linked list of all listeners for a given port. add_port and clone_port place all new listeners in the same sibling list. A member of the 'sibling' list is also a member of the 'next' list. The head of each sibling list has is_sibling==0, and subsequent members of sibling lists have is_sibling==1. is_sibling allows separate sibling lists to be identified while iterating through 'next'. */ struct grpc_tcp_listener *sibling; int is_sibling; }; /* the overall server */ struct grpc_tcp_server { gpr_refcount refs; /* Called whenever accept() succeeds on a server port. */ grpc_tcp_server_cb on_accept_cb; void *on_accept_cb_arg; 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? */ bool shutdown; /* have listeners been shutdown? */ bool shutdown_listeners; /* use SO_REUSEPORT */ bool so_reuseport; /* expand wildcard addresses to a list of all local addresses */ bool expand_wildcard_addrs; /* linked list of server ports */ grpc_tcp_listener *head; grpc_tcp_listener *tail; unsigned nports; /* List of closures passed to shutdown_starting_add(). */ grpc_closure_list shutdown_starting; /* 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; /* next pollset to assign a channel to */ gpr_atm next_pollset_to_assign; grpc_resource_quota *resource_quota; }; static gpr_once check_init = GPR_ONCE_INIT; static bool has_so_reuseport = false; static void init(void) { #ifndef GPR_MANYLINUX1 int s = socket(AF_INET, SOCK_STREAM, 0); if (s >= 0) { has_so_reuseport = GRPC_LOG_IF_ERROR("check for SO_REUSEPORT", grpc_set_socket_reuse_port(s, 1)); close(s); } #endif } grpc_error *grpc_tcp_server_create(grpc_exec_ctx *exec_ctx, grpc_closure *shutdown_complete, const grpc_channel_args *args, grpc_tcp_server **server) { gpr_once_init(&check_init, init); grpc_tcp_server *s = gpr_zalloc(sizeof(grpc_tcp_server)); s->so_reuseport = has_so_reuseport; s->resource_quota = grpc_resource_quota_create(NULL); s->expand_wildcard_addrs = false; for (size_t i = 0; i < (args == NULL ? 0 : args->num_args); i++) { if (0 == strcmp(GRPC_ARG_ALLOW_REUSEPORT, args->args[i].key)) { if (args->args[i].type == GRPC_ARG_INTEGER) { s->so_reuseport = has_so_reuseport && (args->args[i].value.integer != 0); } else { grpc_resource_quota_unref_internal(exec_ctx, s->resource_quota); gpr_free(s); return GRPC_ERROR_CREATE_FROM_STATIC_STRING(GRPC_ARG_ALLOW_REUSEPORT " must be an integer"); } } else if (0 == strcmp(GRPC_ARG_RESOURCE_QUOTA, args->args[i].key)) { if (args->args[i].type == GRPC_ARG_POINTER) { grpc_resource_quota_unref_internal(exec_ctx, s->resource_quota); s->resource_quota = grpc_resource_quota_ref_internal(args->args[i].value.pointer.p); } else { grpc_resource_quota_unref_internal(exec_ctx, s->resource_quota); gpr_free(s); return GRPC_ERROR_CREATE_FROM_STATIC_STRING( GRPC_ARG_RESOURCE_QUOTA " must be a pointer to a buffer pool"); } } else if (0 == strcmp(GRPC_ARG_EXPAND_WILDCARD_ADDRS, args->args[i].key)) { if (args->args[i].type == GRPC_ARG_INTEGER) { s->expand_wildcard_addrs = (args->args[i].value.integer != 0); } else { grpc_resource_quota_unref_internal(exec_ctx, s->resource_quota); gpr_free(s); return GRPC_ERROR_CREATE_FROM_STATIC_STRING( GRPC_ARG_EXPAND_WILDCARD_ADDRS " must be an integer"); } } } gpr_ref_init(&s->refs, 1); gpr_mu_init(&s->mu); s->active_ports = 0; s->destroyed_ports = 0; s->shutdown = false; s->shutdown_starting.head = NULL; s->shutdown_starting.tail = NULL; s->shutdown_complete = shutdown_complete; s->on_accept_cb = NULL; s->on_accept_cb_arg = NULL; s->head = NULL; s->tail = NULL; s->nports = 0; gpr_atm_no_barrier_store(&s->next_pollset_to_assign, 0); *server = s; return GRPC_ERROR_NONE; } static void finish_shutdown(grpc_exec_ctx *exec_ctx, grpc_tcp_server *s) { gpr_mu_lock(&s->mu); GPR_ASSERT(s->shutdown); gpr_mu_unlock(&s->mu); 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_tcp_listener *sp = s->head; s->head = sp->next; gpr_free(sp); } grpc_resource_quota_unref_internal(exec_ctx, s->resource_quota); gpr_free(s); } static void destroyed_port(grpc_exec_ctx *exec_ctx, void *server, grpc_error *error) { grpc_tcp_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_ASSERT(s->destroyed_ports < s->nports); 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_tcp_server *s) { /* delete ALL the things */ gpr_mu_lock(&s->mu); if (!s->shutdown) { gpr_mu_unlock(&s->mu); return; } if (s->head) { grpc_tcp_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); grpc_fd_orphan(exec_ctx, sp->emfd, &sp->destroyed_closure, NULL, "tcp_listener_shutdown"); } gpr_mu_unlock(&s->mu); } else { gpr_mu_unlock(&s->mu); finish_shutdown(exec_ctx, s); } } static void tcp_server_destroy(grpc_exec_ctx *exec_ctx, grpc_tcp_server *s) { gpr_mu_lock(&s->mu); GPR_ASSERT(!s->shutdown); s->shutdown = true; /* shutdown all fd's */ if (s->active_ports) { grpc_tcp_listener *sp; for (sp = s->head; sp; sp = sp->next) { grpc_fd_shutdown(exec_ctx, sp->emfd, GRPC_ERROR_CREATE_FROM_STATIC_STRING( "Server destroyed")); } gpr_mu_unlock(&s->mu); } else { gpr_mu_unlock(&s->mu); deactivated_all_ports(exec_ctx, s); } } /* get max listen queue size on linux */ static void init_max_accept_queue_size(void) { int n = SOMAXCONN; char buf[64]; FILE *fp = fopen("/proc/sys/net/core/somaxconn", "r"); if (fp == NULL) { /* 2.4 kernel. */ s_max_accept_queue_size = SOMAXCONN; return; } if (fgets(buf, sizeof buf, fp)) { char *end; long i = strtol(buf, &end, 10); if (i > 0 && i <= INT_MAX && end && *end == 0) { n = (int)i; } } fclose(fp); s_max_accept_queue_size = n; if (s_max_accept_queue_size < MIN_SAFE_ACCEPT_QUEUE_SIZE) { gpr_log(GPR_INFO, "Suspiciously small accept queue (%d) will probably lead to " "connection drops", s_max_accept_queue_size); } } static int get_max_accept_queue_size(void) { gpr_once_init(&s_init_max_accept_queue_size, init_max_accept_queue_size); return s_max_accept_queue_size; } /* Prepare a recently-created socket for listening. */ static grpc_error *prepare_socket(int fd, const grpc_resolved_address *addr, bool so_reuseport, int *port) { grpc_resolved_address sockname_temp; grpc_error *err = GRPC_ERROR_NONE; GPR_ASSERT(fd >= 0); if (so_reuseport && !grpc_is_unix_socket(addr)) { err = grpc_set_socket_reuse_port(fd, 1); if (err != GRPC_ERROR_NONE) goto error; } err = grpc_set_socket_nonblocking(fd, 1); if (err != GRPC_ERROR_NONE) goto error; err = grpc_set_socket_cloexec(fd, 1); if (err != GRPC_ERROR_NONE) goto error; if (!grpc_is_unix_socket(addr)) { err = grpc_set_socket_low_latency(fd, 1); if (err != GRPC_ERROR_NONE) goto error; err = grpc_set_socket_reuse_addr(fd, 1); if (err != GRPC_ERROR_NONE) goto error; } err = grpc_set_socket_no_sigpipe_if_possible(fd); if (err != GRPC_ERROR_NONE) goto error; GPR_ASSERT(addr->len < ~(socklen_t)0); if (bind(fd, (struct sockaddr *)addr->addr, (socklen_t)addr->len) < 0) { err = GRPC_OS_ERROR(errno, "bind"); goto error; } if (listen(fd, get_max_accept_queue_size()) < 0) { err = GRPC_OS_ERROR(errno, "listen"); goto error; } sockname_temp.len = sizeof(struct sockaddr_storage); if (getsockname(fd, (struct sockaddr *)sockname_temp.addr, (socklen_t *)&sockname_temp.len) < 0) { err = GRPC_OS_ERROR(errno, "getsockname"); goto error; } *port = grpc_sockaddr_get_port(&sockname_temp); return GRPC_ERROR_NONE; error: GPR_ASSERT(err != GRPC_ERROR_NONE); if (fd >= 0) { close(fd); } grpc_error *ret = grpc_error_set_int(GRPC_ERROR_CREATE_REFERENCING_FROM_STATIC_STRING( "Unable to configure socket", &err, 1), GRPC_ERROR_INT_FD, fd); GRPC_ERROR_UNREF(err); return ret; } /* event manager callback when reads are ready */ static void on_read(grpc_exec_ctx *exec_ctx, void *arg, grpc_error *err) { grpc_tcp_listener *sp = arg; if (err != GRPC_ERROR_NONE) { goto error; } grpc_pollset *read_notifier_pollset = sp->server->pollsets[(size_t)gpr_atm_no_barrier_fetch_add( &sp->server->next_pollset_to_assign, 1) % sp->server->pollset_count]; /* loop until accept4 returns EAGAIN, and then re-arm notification */ for (;;) { grpc_resolved_address addr; char *addr_str; char *name; addr.len = sizeof(struct sockaddr_storage); /* Note: If we ever decide to return this address to the user, remember to strip off the ::ffff:0.0.0.0/96 prefix first. */ int fd = grpc_accept4(sp->fd, &addr, 1, 1); if (fd < 0) { switch (errno) { case EINTR: continue; case EAGAIN: grpc_fd_notify_on_read(exec_ctx, sp->emfd, &sp->read_closure); return; default: gpr_mu_lock(&sp->server->mu); if (!sp->server->shutdown_listeners) { gpr_log(GPR_ERROR, "Failed accept4: %s", strerror(errno)); } else { /* if we have shutdown listeners, accept4 could fail, and we needn't notify users */ } gpr_mu_unlock(&sp->server->mu); goto error; } } grpc_set_socket_no_sigpipe_if_possible(fd); addr_str = grpc_sockaddr_to_uri(&addr); gpr_asprintf(&name, "tcp-server-connection:%s", addr_str); if (grpc_tcp_trace) { gpr_log(GPR_DEBUG, "SERVER_CONNECT: incoming connection: %s", addr_str); } grpc_fd *fdobj = grpc_fd_create(fd, name); grpc_pollset_add_fd(exec_ctx, read_notifier_pollset, fdobj); // Create acceptor. grpc_tcp_server_acceptor *acceptor = gpr_malloc(sizeof(*acceptor)); acceptor->from_server = sp->server; acceptor->port_index = sp->port_index; acceptor->fd_index = sp->fd_index; sp->server->on_accept_cb( exec_ctx, sp->server->on_accept_cb_arg, grpc_tcp_create(fdobj, sp->server->resource_quota, GRPC_TCP_DEFAULT_READ_SLICE_SIZE, addr_str), read_notifier_pollset, acceptor); gpr_free(name); gpr_free(addr_str); } GPR_UNREACHABLE_CODE(return ); error: 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); } } static grpc_error *add_socket_to_server(grpc_tcp_server *s, int fd, const grpc_resolved_address *addr, unsigned port_index, unsigned fd_index, grpc_tcp_listener **listener) { grpc_tcp_listener *sp = NULL; int port = -1; char *addr_str; char *name; grpc_error *err = prepare_socket(fd, addr, s->so_reuseport, &port); if (err == GRPC_ERROR_NONE) { GPR_ASSERT(port > 0); grpc_sockaddr_to_string(&addr_str, addr, 1); gpr_asprintf(&name, "tcp-server-listener:%s", addr_str); gpr_mu_lock(&s->mu); s->nports++; GPR_ASSERT(!s->on_accept_cb && "must add ports before starting server"); sp = gpr_malloc(sizeof(grpc_tcp_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->port = port; sp->port_index = port_index; sp->fd_index = fd_index; sp->is_sibling = 0; sp->sibling = NULL; GPR_ASSERT(sp->emfd); gpr_mu_unlock(&s->mu); gpr_free(addr_str); gpr_free(name); } *listener = sp; return err; } /* If successful, add a listener to s for addr, set *dsmode for the socket, and return the *listener. */ static grpc_error *add_addr_to_server(grpc_tcp_server *s, const grpc_resolved_address *addr, unsigned port_index, unsigned fd_index, grpc_dualstack_mode *dsmode, grpc_tcp_listener **listener) { grpc_resolved_address addr4_copy; int fd; grpc_error *err = grpc_create_dualstack_socket(addr, SOCK_STREAM, 0, dsmode, &fd); if (err != GRPC_ERROR_NONE) { return err; } if (*dsmode == GRPC_DSMODE_IPV4 && grpc_sockaddr_is_v4mapped(addr, &addr4_copy)) { addr = &addr4_copy; } return add_socket_to_server(s, fd, addr, port_index, fd_index, listener); } /* Bind to "::" to get a port number not used by any address. */ static grpc_error *get_unused_port(int *port) { grpc_resolved_address wild; grpc_sockaddr_make_wildcard6(0, &wild); grpc_dualstack_mode dsmode; int fd; grpc_error *err = grpc_create_dualstack_socket(&wild, SOCK_STREAM, 0, &dsmode, &fd); if (err != GRPC_ERROR_NONE) { return err; } if (dsmode == GRPC_DSMODE_IPV4) { grpc_sockaddr_make_wildcard4(0, &wild); } if (bind(fd, (const struct sockaddr *)wild.addr, (socklen_t)wild.len) != 0) { err = GRPC_OS_ERROR(errno, "bind"); close(fd); return err; } if (getsockname(fd, (struct sockaddr *)wild.addr, (socklen_t *)&wild.len) != 0) { err = GRPC_OS_ERROR(errno, "getsockname"); close(fd); return err; } close(fd); *port = grpc_sockaddr_get_port(&wild); return *port <= 0 ? GRPC_ERROR_CREATE_FROM_STATIC_STRING("Bad port") : GRPC_ERROR_NONE; } /* Return the listener in s with address addr or NULL. */ static grpc_tcp_listener *find_listener_with_addr(grpc_tcp_server *s, grpc_resolved_address *addr) { grpc_tcp_listener *l; gpr_mu_lock(&s->mu); for (l = s->head; l != NULL; l = l->next) { if (l->addr.len != addr->len) { continue; } if (memcmp(l->addr.addr, addr->addr, addr->len) == 0) { break; } } gpr_mu_unlock(&s->mu); return l; } /* Get all addresses assigned to network interfaces on the machine and create a listener for each. requested_port is the port to use for every listener, or 0 to select one random port that will be used for every listener. Set *out_port to the port selected. Return GRPC_ERROR_NONE only if all listeners were added. */ static grpc_error *add_all_local_addrs_to_server(grpc_tcp_server *s, unsigned port_index, int requested_port, int *out_port) { struct ifaddrs *ifa = NULL; struct ifaddrs *ifa_it; unsigned fd_index = 0; grpc_tcp_listener *sp = NULL; grpc_error *err = GRPC_ERROR_NONE; if (requested_port == 0) { /* Note: There could be a race where some local addrs can listen on the selected port and some can't. The sane way to handle this would be to retry by recreating the whole grpc_tcp_server. Backing out individual listeners and orphaning the FDs looks like too much trouble. */ if ((err = get_unused_port(&requested_port)) != GRPC_ERROR_NONE) { return err; } else if (requested_port <= 0) { return GRPC_ERROR_CREATE_FROM_STATIC_STRING("Bad get_unused_port()"); } gpr_log(GPR_DEBUG, "Picked unused port %d", requested_port); } if (getifaddrs(&ifa) != 0 || ifa == NULL) { return GRPC_OS_ERROR(errno, "getifaddrs"); } for (ifa_it = ifa; ifa_it != NULL; ifa_it = ifa_it->ifa_next) { grpc_resolved_address addr; char *addr_str = NULL; grpc_dualstack_mode dsmode; grpc_tcp_listener *new_sp = NULL; const char *ifa_name = (ifa_it->ifa_name ? ifa_it->ifa_name : ""); if (ifa_it->ifa_addr == NULL) { continue; } else if (ifa_it->ifa_addr->sa_family == AF_INET) { addr.len = sizeof(struct sockaddr_in); } else if (ifa_it->ifa_addr->sa_family == AF_INET6) { addr.len = sizeof(struct sockaddr_in6); } else { continue; } memcpy(addr.addr, ifa_it->ifa_addr, addr.len); if (!grpc_sockaddr_set_port(&addr, requested_port)) { /* Should never happen, because we check sa_family above. */ err = GRPC_ERROR_CREATE_FROM_STATIC_STRING("Failed to set port"); break; } if (grpc_sockaddr_to_string(&addr_str, &addr, 0) < 0) { addr_str = gpr_strdup(""); } gpr_log(GPR_DEBUG, "Adding local addr from interface %s flags 0x%x to server: %s", ifa_name, ifa_it->ifa_flags, addr_str); /* We could have multiple interfaces with the same address (e.g., bonding), so look for duplicates. */ if (find_listener_with_addr(s, &addr) != NULL) { gpr_log(GPR_DEBUG, "Skipping duplicate addr %s on interface %s", addr_str, ifa_name); gpr_free(addr_str); continue; } if ((err = add_addr_to_server(s, &addr, port_index, fd_index, &dsmode, &new_sp)) != GRPC_ERROR_NONE) { char *err_str = NULL; grpc_error *root_err; if (gpr_asprintf(&err_str, "Failed to add listener: %s", addr_str) < 0) { err_str = gpr_strdup("Failed to add listener"); } root_err = GRPC_ERROR_CREATE_FROM_COPIED_STRING(err_str); gpr_free(err_str); gpr_free(addr_str); err = grpc_error_add_child(root_err, err); break; } else { GPR_ASSERT(requested_port == new_sp->port); ++fd_index; if (sp != NULL) { new_sp->is_sibling = 1; sp->sibling = new_sp; } sp = new_sp; } gpr_free(addr_str); } freeifaddrs(ifa); if (err != GRPC_ERROR_NONE) { return err; } else if (sp == NULL) { return GRPC_ERROR_CREATE_FROM_STATIC_STRING("No local addresses"); } else { *out_port = sp->port; return GRPC_ERROR_NONE; } } /* Treat :: or 0.0.0.0 as a family-agnostic wildcard. */ static grpc_error *add_wildcard_addrs_to_server(grpc_tcp_server *s, unsigned port_index, int requested_port, int *out_port) { grpc_resolved_address wild4; grpc_resolved_address wild6; unsigned fd_index = 0; grpc_dualstack_mode dsmode; grpc_tcp_listener *sp = NULL; grpc_tcp_listener *sp2 = NULL; grpc_error *v6_err = GRPC_ERROR_NONE; grpc_error *v4_err = GRPC_ERROR_NONE; *out_port = -1; if (s->expand_wildcard_addrs) { return add_all_local_addrs_to_server(s, port_index, requested_port, out_port); } grpc_sockaddr_make_wildcards(requested_port, &wild4, &wild6); /* Try listening on IPv6 first. */ if ((v6_err = add_addr_to_server(s, &wild6, port_index, fd_index, &dsmode, &sp)) == GRPC_ERROR_NONE) { ++fd_index; requested_port = *out_port = sp->port; if (dsmode == GRPC_DSMODE_DUALSTACK || dsmode == GRPC_DSMODE_IPV4) { return GRPC_ERROR_NONE; } } /* If we got a v6-only socket or nothing, try adding 0.0.0.0. */ grpc_sockaddr_set_port(&wild4, requested_port); if ((v4_err = add_addr_to_server(s, &wild4, port_index, fd_index, &dsmode, &sp2)) == GRPC_ERROR_NONE) { *out_port = sp2->port; if (sp != NULL) { sp2->is_sibling = 1; sp->sibling = sp2; } } if (*out_port > 0) { GRPC_LOG_IF_ERROR("Failed to add :: listener", v6_err); GRPC_LOG_IF_ERROR("Failed to add 0.0.0.0 listener", v4_err); return GRPC_ERROR_NONE; } else { grpc_error *root_err = GRPC_ERROR_CREATE_FROM_STATIC_STRING( "Failed to add any wildcard listeners"); GPR_ASSERT(v6_err != GRPC_ERROR_NONE && v4_err != GRPC_ERROR_NONE); root_err = grpc_error_add_child(root_err, v6_err); root_err = grpc_error_add_child(root_err, v4_err); return root_err; } } static grpc_error *clone_port(grpc_tcp_listener *listener, unsigned count) { grpc_tcp_listener *sp = NULL; char *addr_str; char *name; grpc_error *err; for (grpc_tcp_listener *l = listener->next; l && l->is_sibling; l = l->next) { l->fd_index += count; } for (unsigned i = 0; i < count; i++) { int fd = -1; int port = -1; grpc_dualstack_mode dsmode; err = grpc_create_dualstack_socket(&listener->addr, SOCK_STREAM, 0, &dsmode, &fd); if (err != GRPC_ERROR_NONE) return err; err = prepare_socket(fd, &listener->addr, true, &port); if (err != GRPC_ERROR_NONE) return err; listener->server->nports++; grpc_sockaddr_to_string(&addr_str, &listener->addr, 1); gpr_asprintf(&name, "tcp-server-listener:%s/clone-%d", addr_str, i); sp = gpr_malloc(sizeof(grpc_tcp_listener)); sp->next = listener->next; listener->next = sp; /* sp (the new listener) is a sibling of 'listener' (the original listener). */ sp->is_sibling = 1; sp->sibling = listener->sibling; listener->sibling = sp; sp->server = listener->server; sp->fd = fd; sp->emfd = grpc_fd_create(fd, name); memcpy(&sp->addr, &listener->addr, sizeof(grpc_resolved_address)); sp->port = port; sp->port_index = listener->port_index; sp->fd_index = listener->fd_index + count - i; GPR_ASSERT(sp->emfd); while (listener->server->tail->next != NULL) { listener->server->tail = listener->server->tail->next; } gpr_free(addr_str); gpr_free(name); } return GRPC_ERROR_NONE; } grpc_error *grpc_tcp_server_add_port(grpc_tcp_server *s, const grpc_resolved_address *addr, int *out_port) { grpc_tcp_listener *sp; grpc_resolved_address sockname_temp; grpc_resolved_address addr6_v4mapped; int requested_port = grpc_sockaddr_get_port(addr); unsigned port_index = 0; grpc_dualstack_mode dsmode; grpc_error *err; *out_port = -1; if (s->tail != NULL) { port_index = s->tail->port_index + 1; } grpc_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 (requested_port == 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)) { int used_port = grpc_sockaddr_get_port(&sockname_temp); if (used_port > 0) { memcpy(&sockname_temp, addr, sizeof(grpc_resolved_address)); grpc_sockaddr_set_port(&sockname_temp, used_port); requested_port = used_port; addr = &sockname_temp; break; } } } } if (grpc_sockaddr_is_wildcard(addr, &requested_port)) { return add_wildcard_addrs_to_server(s, port_index, requested_port, out_port); } if (grpc_sockaddr_to_v4mapped(addr, &addr6_v4mapped)) { addr = &addr6_v4mapped; } if ((err = add_addr_to_server(s, addr, port_index, 0, &dsmode, &sp)) == GRPC_ERROR_NONE) { *out_port = sp->port; } return err; } /* Return listener at port_index or NULL. Should only be called with s->mu locked. */ static grpc_tcp_listener *get_port_index(grpc_tcp_server *s, unsigned port_index) { unsigned num_ports = 0; grpc_tcp_listener *sp; for (sp = s->head; sp; sp = sp->next) { if (!sp->is_sibling) { if (++num_ports > port_index) { return sp; } } } return NULL; } unsigned grpc_tcp_server_port_fd_count(grpc_tcp_server *s, unsigned port_index) { unsigned num_fds = 0; gpr_mu_lock(&s->mu); grpc_tcp_listener *sp = get_port_index(s, port_index); for (; sp; sp = sp->sibling) { ++num_fds; } gpr_mu_unlock(&s->mu); return num_fds; } int grpc_tcp_server_port_fd(grpc_tcp_server *s, unsigned port_index, unsigned fd_index) { gpr_mu_lock(&s->mu); grpc_tcp_listener *sp = get_port_index(s, port_index); for (; sp; sp = sp->sibling, --fd_index) { if (fd_index == 0) { gpr_mu_unlock(&s->mu); return sp->fd; } } gpr_mu_unlock(&s->mu); return -1; } void grpc_tcp_server_start(grpc_exec_ctx *exec_ctx, grpc_tcp_server *s, grpc_pollset **pollsets, size_t pollset_count, grpc_tcp_server_cb on_accept_cb, void *on_accept_cb_arg) { size_t i; grpc_tcp_listener *sp; GPR_ASSERT(on_accept_cb); gpr_mu_lock(&s->mu); GPR_ASSERT(!s->on_accept_cb); GPR_ASSERT(s->active_ports == 0); s->on_accept_cb = on_accept_cb; s->on_accept_cb_arg = on_accept_cb_arg; s->pollsets = pollsets; s->pollset_count = pollset_count; sp = s->head; while (sp != NULL) { if (s->so_reuseport && !grpc_is_unix_socket(&sp->addr) && pollset_count > 1) { GPR_ASSERT(GRPC_LOG_IF_ERROR( "clone_port", clone_port(sp, (unsigned)(pollset_count - 1)))); 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; } } else { 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); } grpc_tcp_server *grpc_tcp_server_ref(grpc_tcp_server *s) { gpr_ref_non_zero(&s->refs); return s; } void grpc_tcp_server_shutdown_starting_add(grpc_tcp_server *s, grpc_closure *shutdown_starting) { gpr_mu_lock(&s->mu); grpc_closure_list_append(&s->shutdown_starting, shutdown_starting, GRPC_ERROR_NONE); gpr_mu_unlock(&s->mu); } void grpc_tcp_server_unref(grpc_exec_ctx *exec_ctx, grpc_tcp_server *s) { if (gpr_unref(&s->refs)) { grpc_tcp_server_shutdown_listeners(exec_ctx, s); gpr_mu_lock(&s->mu); grpc_closure_list_sched(exec_ctx, &s->shutdown_starting); gpr_mu_unlock(&s->mu); tcp_server_destroy(exec_ctx, s); } } void grpc_tcp_server_shutdown_listeners(grpc_exec_ctx *exec_ctx, grpc_tcp_server *s) { gpr_mu_lock(&s->mu); s->shutdown_listeners = true; /* shutdown all fd's */ if (s->active_ports) { grpc_tcp_listener *sp; for (sp = s->head; sp; sp = sp->next) { grpc_fd_shutdown(exec_ctx, sp->emfd, GRPC_ERROR_CREATE_FROM_STATIC_STRING("Server shutdown")); } } gpr_mu_unlock(&s->mu); } #endif