diff options
Diffstat (limited to 'src/core/ext')
5 files changed, 147 insertions, 85 deletions
diff --git a/src/core/ext/filters/client_channel/parse_address.c b/src/core/ext/filters/client_channel/parse_address.c index edc6ce697d..18381eec55 100644 --- a/src/core/ext/filters/client_channel/parse_address.c +++ b/src/core/ext/filters/client_channel/parse_address.c @@ -57,11 +57,11 @@ bool grpc_parse_unix(const grpc_uri *uri, struct sockaddr_un *un = (struct sockaddr_un *)resolved_addr->addr; const size_t maxlen = sizeof(un->sun_path); const size_t path_len = strnlen(uri->path, maxlen); - if (path_len == maxlen) return 0; + if (path_len == maxlen) return false; un->sun_family = AF_UNIX; strcpy(un->sun_path, uri->path); resolved_addr->len = sizeof(*un); - return 1; + return true; } #else /* GRPC_HAVE_UNIX_SOCKET */ @@ -73,74 +73,65 @@ bool grpc_parse_unix(const grpc_uri *uri, #endif /* GRPC_HAVE_UNIX_SOCKET */ -bool grpc_parse_ipv4(const grpc_uri *uri, - grpc_resolved_address *resolved_addr) { - if (strcmp("ipv4", uri->scheme) != 0) { - gpr_log(GPR_ERROR, "Expected 'ipv4' scheme, got '%s'", uri->scheme); - return false; - } - const char *host_port = uri->path; +bool grpc_parse_ipv4_hostport(const char *hostport, grpc_resolved_address *addr, + bool log_errors) { + bool success = false; + // Split host and port. char *host; char *port; - int port_num; - bool result = false; - struct sockaddr_in *in = (struct sockaddr_in *)resolved_addr->addr; - - if (*host_port == '/') ++host_port; - if (!gpr_split_host_port(host_port, &host, &port)) { - return false; - } - - memset(resolved_addr, 0, sizeof(grpc_resolved_address)); - resolved_addr->len = sizeof(struct sockaddr_in); + if (!gpr_split_host_port(hostport, &host, &port)) return false; + // Parse IP address. + memset(addr, 0, sizeof(*addr)); + addr->len = sizeof(struct sockaddr_in); + struct sockaddr_in *in = (struct sockaddr_in *)addr->addr; in->sin_family = AF_INET; if (inet_pton(AF_INET, host, &in->sin_addr) == 0) { - gpr_log(GPR_ERROR, "invalid ipv4 address: '%s'", host); + if (log_errors) gpr_log(GPR_ERROR, "invalid ipv4 address: '%s'", host); goto done; } - - if (port != NULL) { - if (sscanf(port, "%d", &port_num) != 1 || port_num < 0 || - port_num > 65535) { - gpr_log(GPR_ERROR, "invalid ipv4 port: '%s'", port); - goto done; - } - in->sin_port = htons((uint16_t)port_num); - } else { - gpr_log(GPR_ERROR, "no port given for ipv4 scheme"); + // Parse port. + if (port == NULL) { + if (log_errors) gpr_log(GPR_ERROR, "no port given for ipv4 scheme"); goto done; } - - result = true; + int port_num; + if (sscanf(port, "%d", &port_num) != 1 || port_num < 0 || port_num > 65535) { + if (log_errors) gpr_log(GPR_ERROR, "invalid ipv4 port: '%s'", port); + goto done; + } + in->sin_port = htons((uint16_t)port_num); + success = true; done: gpr_free(host); gpr_free(port); - return result; + return success; } -bool grpc_parse_ipv6(const grpc_uri *uri, +bool grpc_parse_ipv4(const grpc_uri *uri, grpc_resolved_address *resolved_addr) { - if (strcmp("ipv6", uri->scheme) != 0) { - gpr_log(GPR_ERROR, "Expected 'ipv6' scheme, got '%s'", uri->scheme); + if (strcmp("ipv4", uri->scheme) != 0) { + gpr_log(GPR_ERROR, "Expected 'ipv4' scheme, got '%s'", uri->scheme); return false; } const char *host_port = uri->path; - char *host; - char *port; - int port_num; - int result = 0; - struct sockaddr_in6 *in6 = (struct sockaddr_in6 *)resolved_addr->addr; - if (*host_port == '/') ++host_port; - if (!gpr_split_host_port(host_port, &host, &port)) { - return 0; - } + return grpc_parse_ipv4_hostport(host_port, resolved_addr, + true /* log_errors */); +} - memset(in6, 0, sizeof(*in6)); - resolved_addr->len = sizeof(*in6); +bool grpc_parse_ipv6_hostport(const char *hostport, grpc_resolved_address *addr, + bool log_errors) { + bool success = false; + // Split host and port. + char *host; + char *port; + if (!gpr_split_host_port(hostport, &host, &port)) return false; + // Parse IP address. + memset(addr, 0, sizeof(*addr)); + addr->len = sizeof(struct sockaddr_in6); + struct sockaddr_in6 *in6 = (struct sockaddr_in6 *)addr->addr; in6->sin6_family = AF_INET6; - - /* Handle the RFC6874 syntax for IPv6 zone identifiers. */ + // Handle the RFC6874 syntax for IPv6 zone identifiers. char *host_end = (char *)gpr_memrchr(host, '%', strlen(host)); if (host_end != NULL) { GPR_ASSERT(host_end >= host); @@ -159,7 +150,7 @@ bool grpc_parse_ipv6(const grpc_uri *uri, gpr_log(GPR_ERROR, "invalid ipv6 scope id: '%s'", host_end + 1); goto done; } - // Handle "sin6_scope_id" being type "u_long". See grpc issue ##10027. + // Handle "sin6_scope_id" being type "u_long". See grpc issue #10027. in6->sin6_scope_id = sin6_scope_id; } else { if (inet_pton(AF_INET6, host, &in6->sin6_addr) == 0) { @@ -167,24 +158,34 @@ bool grpc_parse_ipv6(const grpc_uri *uri, goto done; } } - - if (port != NULL) { - if (sscanf(port, "%d", &port_num) != 1 || port_num < 0 || - port_num > 65535) { - gpr_log(GPR_ERROR, "invalid ipv6 port: '%s'", port); - goto done; - } - in6->sin6_port = htons((uint16_t)port_num); - } else { - gpr_log(GPR_ERROR, "no port given for ipv6 scheme"); + // Parse port. + if (port == NULL) { + if (log_errors) gpr_log(GPR_ERROR, "no port given for ipv6 scheme"); goto done; } - - result = 1; + int port_num; + if (sscanf(port, "%d", &port_num) != 1 || port_num < 0 || port_num > 65535) { + if (log_errors) gpr_log(GPR_ERROR, "invalid ipv6 port: '%s'", port); + goto done; + } + in6->sin6_port = htons((uint16_t)port_num); + success = true; done: gpr_free(host); gpr_free(port); - return result; + return success; +} + +bool grpc_parse_ipv6(const grpc_uri *uri, + grpc_resolved_address *resolved_addr) { + if (strcmp("ipv6", uri->scheme) != 0) { + gpr_log(GPR_ERROR, "Expected 'ipv6' scheme, got '%s'", uri->scheme); + return false; + } + const char *host_port = uri->path; + if (*host_port == '/') ++host_port; + return grpc_parse_ipv6_hostport(host_port, resolved_addr, + true /* log_errors */); } bool grpc_parse_uri(const grpc_uri *uri, grpc_resolved_address *resolved_addr) { diff --git a/src/core/ext/filters/client_channel/parse_address.h b/src/core/ext/filters/client_channel/parse_address.h index fa7ea33a00..1a203a3b26 100644 --- a/src/core/ext/filters/client_channel/parse_address.h +++ b/src/core/ext/filters/client_channel/parse_address.h @@ -54,4 +54,10 @@ bool grpc_parse_ipv6(const grpc_uri *uri, grpc_resolved_address *resolved_addr); /** Populate \a resolved_addr from \a uri. Returns true upon success. */ bool grpc_parse_uri(const grpc_uri *uri, grpc_resolved_address *resolved_addr); +/** Parse bare IPv4 or IPv6 "IP:port" strings. */ +bool grpc_parse_ipv4_hostport(const char *hostport, grpc_resolved_address *addr, + bool log_errors); +bool grpc_parse_ipv6_hostport(const char *hostport, grpc_resolved_address *addr, + bool log_errors); + #endif /* GRPC_CORE_EXT_FILTERS_CLIENT_CHANNEL_PARSE_ADDRESS_H */ diff --git a/src/core/ext/filters/client_channel/resolver/dns/c_ares/dns_resolver_ares.c b/src/core/ext/filters/client_channel/resolver/dns/c_ares/dns_resolver_ares.c index ffaeeed324..578e8d697f 100644 --- a/src/core/ext/filters/client_channel/resolver/dns/c_ares/dns_resolver_ares.c +++ b/src/core/ext/filters/client_channel/resolver/dns/c_ares/dns_resolver_ares.c @@ -61,6 +61,8 @@ typedef struct { /** base class: must be first */ grpc_resolver base; + /** DNS server to use (if not system default) */ + char *dns_server; /** name to resolve (usually the same as target_name) */ char *name_to_resolve; /** default port to use */ @@ -172,6 +174,8 @@ static void dns_ares_on_resolved_locked(grpc_exec_ctx *exec_ctx, void *arg, grpc_resolved_addresses_destroy(r->addresses); grpc_lb_addresses_destroy(exec_ctx, addresses); } else { + const char *msg = grpc_error_string(error); + gpr_log(GPR_DEBUG, "dns resolution failed: %s", msg); gpr_timespec now = gpr_now(GPR_CLOCK_MONOTONIC); gpr_timespec next_try = gpr_backoff_step(&r->backoff_state, now); gpr_timespec timeout = gpr_time_sub(next_try, now); @@ -221,9 +225,9 @@ static void dns_ares_start_resolving_locked(grpc_exec_ctx *exec_ctx, GPR_ASSERT(!r->resolving); r->resolving = true; r->addresses = NULL; - grpc_resolve_address(exec_ctx, r->name_to_resolve, r->default_port, - r->interested_parties, &r->dns_ares_on_resolved_locked, - &r->addresses); + grpc_dns_lookup_ares(exec_ctx, r->dns_server, r->name_to_resolve, + r->default_port, r->interested_parties, + &r->dns_ares_on_resolved_locked, &r->addresses); } static void dns_ares_maybe_finish_next_locked(grpc_exec_ctx *exec_ctx, @@ -246,6 +250,7 @@ static void dns_ares_destroy(grpc_exec_ctx *exec_ctx, grpc_resolver *gr) { grpc_channel_args_destroy(exec_ctx, r->resolved_result); } grpc_pollset_set_destroy(exec_ctx, r->interested_parties); + gpr_free(r->dns_server); gpr_free(r->name_to_resolve); gpr_free(r->default_port); grpc_channel_args_destroy(exec_ctx, r->channel_args); @@ -257,14 +262,13 @@ static grpc_resolver *dns_ares_create(grpc_exec_ctx *exec_ctx, const char *default_port) { // Get name from args. const char *path = args->uri->path; - if (0 != strcmp(args->uri->authority, "")) { - gpr_log(GPR_ERROR, "authority based dns uri's not supported"); - return NULL; - } if (path[0] == '/') ++path; // Create resolver. ares_dns_resolver *r = gpr_zalloc(sizeof(ares_dns_resolver)); grpc_resolver_init(&r->base, &dns_ares_resolver_vtable, args->combiner); + if (0 != strcmp(args->uri->authority, "")) { + r->dns_server = gpr_strdup(args->uri->authority); + } r->name_to_resolve = gpr_strdup(path); r->default_port = gpr_strdup(default_port); r->channel_args = grpc_channel_args_copy(args->args); diff --git a/src/core/ext/filters/client_channel/resolver/dns/c_ares/grpc_ares_wrapper.c b/src/core/ext/filters/client_channel/resolver/dns/c_ares/grpc_ares_wrapper.c index 09c46a66e0..e0cfd8b629 100644 --- a/src/core/ext/filters/client_channel/resolver/dns/c_ares/grpc_ares_wrapper.c +++ b/src/core/ext/filters/client_channel/resolver/dns/c_ares/grpc_ares_wrapper.c @@ -48,7 +48,10 @@ #include <grpc/support/string_util.h> #include <grpc/support/time.h> #include <grpc/support/useful.h> + +#include "src/core/ext/filters/client_channel/parse_address.h" #include "src/core/ext/filters/client_channel/resolver/dns/c_ares/grpc_ares_ev_driver.h" +#include "src/core/lib/iomgr/error.h" #include "src/core/lib/iomgr/executor.h" #include "src/core/lib/iomgr/iomgr_internal.h" #include "src/core/lib/iomgr/sockaddr_utils.h" @@ -58,6 +61,8 @@ static gpr_once g_basic_init = GPR_ONCE_INIT; static gpr_mu g_init_mu; typedef struct grpc_ares_request { + /** indicates the DNS server to use, if specified */ + struct ares_addr_port_node dns_server_addr; /** following members are set in grpc_resolve_address_ares_impl */ /** host to resolve, parsed from the name to resolve */ char *host; @@ -192,11 +197,12 @@ static void on_done_cb(void *arg, int status, int timeouts, grpc_ares_request_unref(NULL, r); } -void grpc_resolve_address_ares_impl(grpc_exec_ctx *exec_ctx, const char *name, - const char *default_port, - grpc_pollset_set *interested_parties, - grpc_closure *on_done, - grpc_resolved_addresses **addrs) { +void grpc_dns_lookup_ares(grpc_exec_ctx *exec_ctx, const char *dns_server, + const char *name, const char *default_port, + grpc_pollset_set *interested_parties, + grpc_closure *on_done, + grpc_resolved_addresses **addrs) { + grpc_error *error = GRPC_ERROR_NONE; /* TODO(zyc): Enable tracing after #9603 is checked in */ /* if (grpc_dns_trace) { gpr_log(GPR_DEBUG, "resolve_address (blocking): name=%s, default_port=%s", @@ -208,28 +214,23 @@ void grpc_resolve_address_ares_impl(grpc_exec_ctx *exec_ctx, const char *name, char *port; gpr_split_host_port(name, &host, &port); if (host == NULL) { - grpc_error *err = grpc_error_set_str( + error = grpc_error_set_str( GRPC_ERROR_CREATE_FROM_STATIC_STRING("unparseable host:port"), GRPC_ERROR_STR_TARGET_ADDRESS, grpc_slice_from_copied_string(name)); - grpc_closure_sched(exec_ctx, on_done, err); goto error_cleanup; } else if (port == NULL) { if (default_port == NULL) { - grpc_error *err = grpc_error_set_str( + error = grpc_error_set_str( GRPC_ERROR_CREATE_FROM_STATIC_STRING("no port in name"), GRPC_ERROR_STR_TARGET_ADDRESS, grpc_slice_from_copied_string(name)); - grpc_closure_sched(exec_ctx, on_done, err); goto error_cleanup; } port = gpr_strdup(default_port); } grpc_ares_ev_driver *ev_driver; - grpc_error *err = grpc_ares_ev_driver_create(&ev_driver, interested_parties); - if (err != GRPC_ERROR_NONE) { - GRPC_LOG_IF_ERROR("grpc_ares_ev_driver_create() failed", err); - goto error_cleanup; - } + error = grpc_ares_ev_driver_create(&ev_driver, interested_parties); + if (error != GRPC_ERROR_NONE) goto error_cleanup; grpc_ares_request *r = gpr_malloc(sizeof(grpc_ares_request)); gpr_mu_init(&r->mu); @@ -242,6 +243,40 @@ void grpc_resolve_address_ares_impl(grpc_exec_ctx *exec_ctx, const char *name, r->success = false; r->error = GRPC_ERROR_NONE; ares_channel *channel = grpc_ares_ev_driver_get_channel(r->ev_driver); + + // If dns_server is specified, use it. + if (dns_server != NULL) { + gpr_log(GPR_INFO, "Using DNS server %s", dns_server); + grpc_resolved_address addr; + if (grpc_parse_ipv4_hostport(dns_server, &addr, false /* log_errors */)) { + r->dns_server_addr.family = AF_INET; + memcpy(&r->dns_server_addr.addr.addr4, addr.addr, addr.len); + r->dns_server_addr.tcp_port = grpc_sockaddr_get_port(&addr); + r->dns_server_addr.udp_port = grpc_sockaddr_get_port(&addr); + } else if (grpc_parse_ipv6_hostport(dns_server, &addr, + false /* log_errors */)) { + r->dns_server_addr.family = AF_INET6; + memcpy(&r->dns_server_addr.addr.addr6, addr.addr, addr.len); + r->dns_server_addr.tcp_port = grpc_sockaddr_get_port(&addr); + r->dns_server_addr.udp_port = grpc_sockaddr_get_port(&addr); + } else { + error = grpc_error_set_str( + GRPC_ERROR_CREATE_FROM_STATIC_STRING("cannot parse authority"), + GRPC_ERROR_STR_TARGET_ADDRESS, grpc_slice_from_copied_string(name)); + goto error_cleanup; + } + int status = ares_set_servers_ports(*channel, &r->dns_server_addr); + if (status != ARES_SUCCESS) { + char *error_msg; + gpr_asprintf(&error_msg, "C-ares status is not ARES_SUCCESS: %s", + ares_strerror(status)); + error = GRPC_ERROR_CREATE_FROM_COPIED_STRING(error_msg); + gpr_free(error_msg); + goto error_cleanup; + } + } + // An extra reference is put here to avoid destroying the request in + // on_done_cb before calling grpc_ares_ev_driver_start. gpr_ref_init(&r->pending_queries, 2); if (grpc_ipv6_loopback_available()) { gpr_ref(&r->pending_queries); @@ -254,10 +289,20 @@ void grpc_resolve_address_ares_impl(grpc_exec_ctx *exec_ctx, const char *name, return; error_cleanup: + grpc_closure_sched(exec_ctx, on_done, error); gpr_free(host); gpr_free(port); } +void grpc_resolve_address_ares_impl(grpc_exec_ctx *exec_ctx, const char *name, + const char *default_port, + grpc_pollset_set *interested_parties, + grpc_closure *on_done, + grpc_resolved_addresses **addrs) { + grpc_dns_lookup_ares(exec_ctx, NULL /* dns_server */, name, default_port, + interested_parties, on_done, addrs); +} + void (*grpc_resolve_address_ares)( grpc_exec_ctx *exec_ctx, const char *name, const char *default_port, grpc_pollset_set *interested_parties, grpc_closure *on_done, diff --git a/src/core/ext/filters/client_channel/resolver/dns/c_ares/grpc_ares_wrapper.h b/src/core/ext/filters/client_channel/resolver/dns/c_ares/grpc_ares_wrapper.h index 3dd40ea268..84fd7fcbd6 100644 --- a/src/core/ext/filters/client_channel/resolver/dns/c_ares/grpc_ares_wrapper.h +++ b/src/core/ext/filters/client_channel/resolver/dns/c_ares/grpc_ares_wrapper.h @@ -51,6 +51,12 @@ extern void (*grpc_resolve_address_ares)(grpc_exec_ctx *exec_ctx, grpc_closure *on_done, grpc_resolved_addresses **addresses); +void grpc_dns_lookup_ares(grpc_exec_ctx *exec_ctx, const char *dns_server, + const char *addr, const char *default_port, + grpc_pollset_set *interested_parties, + grpc_closure *on_done, + grpc_resolved_addresses **addresses); + /* Initialize gRPC ares wrapper. Must be called at least once before grpc_resolve_address_ares(). */ grpc_error *grpc_ares_init(void); |