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Diffstat (limited to 'src/core/lib/iomgr/tcp_server_posix.c')
-rw-r--r--src/core/lib/iomgr/tcp_server_posix.c331
1 files changed, 251 insertions, 80 deletions
diff --git a/src/core/lib/iomgr/tcp_server_posix.c b/src/core/lib/iomgr/tcp_server_posix.c
index e9e7511c9c..36f878fdd4 100644
--- a/src/core/lib/iomgr/tcp_server_posix.c
+++ b/src/core/lib/iomgr/tcp_server_posix.c
@@ -44,6 +44,7 @@
#include <errno.h>
#include <fcntl.h>
+#include <ifaddrs.h>
#include <limits.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
@@ -115,6 +116,8 @@ struct grpc_tcp_server {
bool shutdown;
/* 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;
@@ -161,6 +164,7 @@ grpc_error *grpc_tcp_server_create(grpc_exec_ctx *exec_ctx,
grpc_tcp_server *s = gpr_malloc(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) {
@@ -183,6 +187,15 @@ grpc_error *grpc_tcp_server_create(grpc_exec_ctx *exec_ctx,
return GRPC_ERROR_CREATE(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(GRPC_ARG_EXPAND_WILDCARD_ADDRS
+ " must be an integer");
+ }
}
}
gpr_ref_init(&s->refs, 1);
@@ -504,9 +517,224 @@ static grpc_error *add_socket_to_server(grpc_tcp_server *s, int fd,
return err;
}
-/* Insert count new listeners after listener. Every new listener will have the
- same listen address as listener (SO_REUSEPORT must be enabled). Every new
- listener is a sibling of listener. */
+/* 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("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("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 : "<unknown>");
+ 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("Failed to set port");
+ break;
+ }
+ if (grpc_sockaddr_to_string(&addr_str, &addr, 0) < 0) {
+ addr_str = gpr_strdup("<error>");
+ }
+ 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(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("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("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;
@@ -559,19 +787,13 @@ grpc_error *grpc_tcp_server_add_port(grpc_tcp_server *s,
const grpc_resolved_address *addr,
int *out_port) {
grpc_tcp_listener *sp;
- grpc_tcp_listener *sp2 = NULL;
- int fd;
- grpc_dualstack_mode dsmode;
- grpc_resolved_address addr6_v4mapped;
- grpc_resolved_address wild4;
- grpc_resolved_address wild6;
- grpc_resolved_address addr4_copy;
- grpc_resolved_address *allocated_addr = NULL;
grpc_resolved_address sockname_temp;
- int port;
+ grpc_resolved_address addr6_v4mapped;
+ int requested_port = grpc_sockaddr_get_port(addr);
unsigned port_index = 0;
- unsigned fd_index = 0;
- grpc_error *errs[2] = {GRPC_ERROR_NONE, GRPC_ERROR_NONE};
+ grpc_dualstack_mode dsmode;
+ grpc_error *err;
+ *out_port = -1;
if (s->tail != NULL) {
port_index = s->tail->port_index + 1;
}
@@ -579,85 +801,34 @@ grpc_error *grpc_tcp_server_add_port(grpc_tcp_server *s,
/* 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) {
+ 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,
+ if (0 == getsockname(sp->fd, (struct sockaddr *)&sockname_temp.addr,
(socklen_t *)&sockname_temp.len)) {
- port = grpc_sockaddr_get_port(&sockname_temp);
- if (port > 0) {
- allocated_addr = gpr_malloc(sizeof(grpc_resolved_address));
- memcpy(allocated_addr, addr, addr->len);
- grpc_sockaddr_set_port(allocated_addr, port);
- addr = allocated_addr;
+ 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;
}
}
}
}
-
- sp = NULL;
-
+ 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;
}
-
- /* 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 = &wild6;
- errs[0] = grpc_create_dualstack_socket(addr, SOCK_STREAM, 0, &dsmode, &fd);
- if (errs[0] == GRPC_ERROR_NONE) {
- errs[0] = add_socket_to_server(s, fd, addr, port_index, fd_index, &sp);
- if (fd >= 0 && dsmode == GRPC_DSMODE_DUALSTACK) {
- goto done;
- }
- if (sp != NULL) {
- ++fd_index;
- }
- /* If we didn't get a dualstack socket, also listen on 0.0.0.0. */
- if (port == 0 && sp != NULL) {
- grpc_sockaddr_set_port(&wild4, sp->port);
- }
- }
- addr = &wild4;
- }
-
- errs[1] = grpc_create_dualstack_socket(addr, SOCK_STREAM, 0, &dsmode, &fd);
- if (errs[1] == GRPC_ERROR_NONE) {
- if (dsmode == GRPC_DSMODE_IPV4 &&
- grpc_sockaddr_is_v4mapped(addr, &addr4_copy)) {
- addr = &addr4_copy;
- }
- sp2 = sp;
- errs[1] = add_socket_to_server(s, fd, addr, port_index, fd_index, &sp);
- if (sp2 != NULL && sp != NULL) {
- sp2->sibling = sp;
- sp->is_sibling = 1;
- }
- }
-
-done:
- gpr_free(allocated_addr);
- if (sp != NULL) {
+ if ((err = add_addr_to_server(s, addr, port_index, 0, &dsmode, &sp)) ==
+ GRPC_ERROR_NONE) {
*out_port = sp->port;
- GRPC_ERROR_UNREF(errs[0]);
- GRPC_ERROR_UNREF(errs[1]);
- return GRPC_ERROR_NONE;
- } else {
- *out_port = -1;
- char *addr_str = grpc_sockaddr_to_uri(addr);
- grpc_error *err = grpc_error_set_str(
- GRPC_ERROR_CREATE_REFERENCING("Failed to add port to server", errs,
- GPR_ARRAY_SIZE(errs)),
- GRPC_ERROR_STR_TARGET_ADDRESS, addr_str);
- GRPC_ERROR_UNREF(errs[0]);
- GRPC_ERROR_UNREF(errs[1]);
- gpr_free(addr_str);
- return err;
}
+ return err;
}
/* Return listener at port_index or NULL. Should only be called with s->mu