diff options
Diffstat (limited to 'src/core/lib/iomgr/tcp_server_posix.c')
| -rw-r--r-- | src/core/lib/iomgr/tcp_server_posix.c | 331 |
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 |