| /* |
| * |
| * 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 GPR_POSIX_SOCKET |
| |
| #include "src/core/iomgr/tcp_server.h" |
| |
| #include <errno.h> |
| #include <fcntl.h> |
| #include <limits.h> |
| #include <netinet/in.h> |
| #include <netinet/tcp.h> |
| #include <stdio.h> |
| #include <string.h> |
| #include <sys/socket.h> |
| #include <sys/stat.h> |
| #include <sys/types.h> |
| #include <sys/un.h> |
| #include <unistd.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/iomgr/tcp_posix.h" |
| #include <grpc/support/alloc.h> |
| #include <grpc/support/log.h> |
| #include <grpc/support/sync.h> |
| #include <grpc/support/time.h> |
| |
| #define INIT_PORT_CAP 2 |
| #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 { |
| int fd; |
| grpc_fd *emfd; |
| grpc_tcp_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; |
| } 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_tcp_server { |
| grpc_tcp_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; |
| |
| /* all listening ports */ |
| server_port *ports; |
| size_t nports; |
| size_t port_capacity; |
| |
| /* shutdown callback */ |
| void (*shutdown_complete)(void *); |
| void *shutdown_complete_arg; |
| }; |
| |
| grpc_tcp_server *grpc_tcp_server_create(void) { |
| grpc_tcp_server *s = gpr_malloc(sizeof(grpc_tcp_server)); |
| gpr_mu_init(&s->mu); |
| gpr_cv_init(&s->cv); |
| s->active_ports = 0; |
| s->destroyed_ports = 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_tcp_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_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(s); |
| } else { |
| gpr_mu_unlock(&s->mu); |
| } |
| } |
| |
| static void dont_care_about_shutdown_completion(void *ignored) {} |
| |
| void grpc_tcp_server_destroy( |
| grpc_tcp_server *s, void (*shutdown_complete)(void *shutdown_complete_arg), |
| void *shutdown_complete_arg) { |
| size_t i; |
| gpr_mu_lock(&s->mu); |
| |
| s->shutdown_complete = shutdown_complete |
| ? shutdown_complete |
| : dont_care_about_shutdown_completion; |
| s->shutdown_complete_arg = shutdown_complete_arg; |
| |
| /* shutdown all fd's */ |
| for (i = 0; i < s->nports; i++) { |
| grpc_fd_shutdown(s->ports[i].emfd); |
| } |
| /* wait while that happens */ |
| /* TODO(ctiller): make this asynchronous also */ |
| while (s->active_ports) { |
| gpr_cv_wait(&s->cv, &s->mu, gpr_inf_future); |
| } |
| |
| /* delete ALL the things */ |
| 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); |
| } |
| grpc_fd_orphan(sp->emfd, destroyed_port, s); |
| } |
| gpr_mu_unlock(&s->mu); |
| } else { |
| gpr_mu_unlock(&s->mu); |
| finish_shutdown(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 = 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 int prepare_socket(int fd, const struct sockaddr *addr, int 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) || |
| (addr->sa_family != AF_UNIX && (!grpc_set_socket_low_latency(fd, 1) || |
| !grpc_set_socket_reuse_addr(fd, 1)))) { |
| gpr_log(GPR_ERROR, "Unable to configure socket %d: %s", fd, |
| strerror(errno)); |
| goto error; |
| } |
| |
| 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; |
| } |
| |
| if (listen(fd, get_max_accept_queue_size()) < 0) { |
| gpr_log(GPR_ERROR, "listen: %s", strerror(errno)); |
| 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) { |
| goto error; |
| } |
| |
| /* loop until accept4 returns EAGAIN, and then re-arm notification */ |
| for (;;) { |
| struct sockaddr_storage addr; |
| socklen_t addrlen = sizeof(addr); |
| /* 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, (struct sockaddr *)&addr, &addrlen, 1, 1); |
| if (fd < 0) { |
| switch (errno) { |
| case EINTR: |
| continue; |
| case EAGAIN: |
| grpc_fd_notify_on_read(sp->emfd, &sp->read_closure); |
| return; |
| default: |
| gpr_log(GPR_ERROR, "Failed accept4: %s", strerror(errno)); |
| goto error; |
| } |
| } |
| |
| sp->server->cb( |
| sp->server->cb_arg, |
| grpc_tcp_create(grpc_fd_create(fd), GRPC_TCP_DEFAULT_READ_SLICE_SIZE)); |
| } |
| |
| abort(); |
| |
| error: |
| gpr_mu_lock(&sp->server->mu); |
| if (0 == --sp->server->active_ports) { |
| gpr_cv_broadcast(&sp->server->cv); |
| } |
| gpr_mu_unlock(&sp->server->mu); |
| } |
| |
| static int add_socket_to_server(grpc_tcp_server *s, int fd, |
| const struct sockaddr *addr, int addr_len) { |
| server_port *sp; |
| int port; |
| |
| port = prepare_socket(fd, addr, addr_len); |
| if (port >= 0) { |
| 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); |
| memcpy(sp->addr.untyped, addr, addr_len); |
| sp->addr_len = addr_len; |
| GPR_ASSERT(sp->emfd); |
| gpr_mu_unlock(&s->mu); |
| } |
| |
| return port; |
| } |
| |
| int grpc_tcp_server_add_port(grpc_tcp_server *s, const void *addr, |
| int addr_len) { |
| 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_STREAM, 0, &dsmode); |
| allocated_port1 = add_socket_to_server(s, fd, addr, addr_len); |
| 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_STREAM, 0, &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); |
| |
| done: |
| gpr_free(allocated_addr); |
| return allocated_port1 >= 0 ? allocated_port1 : allocated_port2; |
| } |
| |
| int grpc_tcp_server_get_fd(grpc_tcp_server *s, unsigned index) { |
| return (index < s->nports) ? s->ports[index].fd : -1; |
| } |
| |
| void grpc_tcp_server_start(grpc_tcp_server *s, grpc_pollset **pollsets, |
| size_t pollset_count, grpc_tcp_server_cb cb, |
| void *cb_arg) { |
| size_t i, j; |
| GPR_ASSERT(cb); |
| gpr_mu_lock(&s->mu); |
| GPR_ASSERT(!s->cb); |
| GPR_ASSERT(s->active_ports == 0); |
| s->cb = cb; |
| s->cb_arg = cb_arg; |
| 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); |
| } |
| |
| #endif |