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-rw-r--r--src/core/iomgr/udp_server.c438
1 files changed, 438 insertions, 0 deletions
diff --git a/src/core/iomgr/udp_server.c b/src/core/iomgr/udp_server.c
new file mode 100644
index 0000000000..db0aef8120
--- /dev/null
+++ b/src/core/iomgr/udp_server.c
@@ -0,0 +1,438 @@
+/*
+ *
+ * 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/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 <sys/un.h>
+#include <unistd.h>
+
+#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 <grpc/support/alloc.h>
+#include <grpc/support/log.h>
+#include <grpc/support/sync.h>
+#include <grpc/support/string_util.h>
+#include <grpc/support/time.h>
+
+#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
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