diff options
Diffstat (limited to 'src/core/lib/iomgr/resolve_address_cares.c')
| -rw-r--r-- | src/core/lib/iomgr/resolve_address_cares.c | 201 |
1 files changed, 201 insertions, 0 deletions
diff --git a/src/core/lib/iomgr/resolve_address_cares.c b/src/core/lib/iomgr/resolve_address_cares.c new file mode 100644 index 0000000000..372a7cfcd9 --- /dev/null +++ b/src/core/lib/iomgr/resolve_address_cares.c @@ -0,0 +1,201 @@ +/* + * + * Copyright 2016, 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. + * + */ + +#include <grpc/support/port_platform.h> +#ifdef GPR_POSIX_SOCKET + +#include "src/core/lib/iomgr/resolve_address.h" +#include "src/core/lib/iomgr/sockaddr.h" + +#include <string.h> +#include <sys/types.h> + +#include <ares.h> +#include <grpc/support/alloc.h> +#include <grpc/support/host_port.h> +#include <grpc/support/log.h> +#include <grpc/support/string_util.h> +#include <grpc/support/thd.h> +#include <grpc/support/time.h> +#include <grpc/support/useful.h> +#include "src/core/lib/iomgr/executor.h" +#include "src/core/lib/iomgr/iomgr_internal.h" +#include "src/core/lib/iomgr/sockaddr_utils.h" +#include "src/core/lib/iomgr/unix_sockets_posix.h" +#include "src/core/lib/support/block_annotate.h" +#include "src/core/lib/support/string.h" + +static grpc_error *blocking_resolve_address_impl( + const char *name, const char *default_port, + grpc_resolved_addresses **addresses) { + struct addrinfo hints; + struct addrinfo *result = NULL, *resp; + char *host; + char *port; + int s; + size_t i; + grpc_error *err; + + if (name[0] == 'u' && name[1] == 'n' && name[2] == 'i' && name[3] == 'x' && + name[4] == ':' && name[5] != 0) { + return grpc_resolve_unix_domain_address(name + 5, addresses); + } + + /* parse name, splitting it into host and port parts */ + gpr_split_host_port(name, &host, &port); + if (host == NULL) { + err = grpc_error_set_str(GRPC_ERROR_CREATE("unparseable host:port"), + GRPC_ERROR_STR_TARGET_ADDRESS, name); + goto done; + } + if (port == NULL) { + if (default_port == NULL) { + err = grpc_error_set_str(GRPC_ERROR_CREATE("no port in name"), + GRPC_ERROR_STR_TARGET_ADDRESS, name); + goto done; + } + port = gpr_strdup(default_port); + } + + /* Call getaddrinfo */ + memset(&hints, 0, sizeof(hints)); + hints.ai_family = AF_UNSPEC; /* ipv4 or ipv6 */ + hints.ai_socktype = SOCK_STREAM; /* stream socket */ + hints.ai_flags = AI_PASSIVE; /* for wildcard IP address */ + + GRPC_SCHEDULING_START_BLOCKING_REGION; + s = getaddrinfo(host, port, &hints, &result); + GRPC_SCHEDULING_END_BLOCKING_REGION; + + if (s != 0) { + /* Retry if well-known service name is recognized */ + char *svc[][2] = {{"http", "80"}, {"https", "443"}}; + for (i = 0; i < GPR_ARRAY_SIZE(svc); i++) { + if (strcmp(port, svc[i][0]) == 0) { + GRPC_SCHEDULING_START_BLOCKING_REGION; + s = getaddrinfo(host, svc[i][1], &hints, &result); + GRPC_SCHEDULING_END_BLOCKING_REGION; + break; + } + } + } + + if (s != 0) { + err = grpc_error_set_str( + grpc_error_set_str( + grpc_error_set_str(grpc_error_set_int(GRPC_ERROR_CREATE("OS Error"), + GRPC_ERROR_INT_ERRNO, s), + GRPC_ERROR_STR_OS_ERROR, gai_strerror(s)), + GRPC_ERROR_STR_SYSCALL, "getaddrinfo"), + GRPC_ERROR_STR_TARGET_ADDRESS, name); + goto done; + } + + /* Success path: set addrs non-NULL, fill it in */ + *addresses = gpr_malloc(sizeof(grpc_resolved_addresses)); + (*addresses)->naddrs = 0; + for (resp = result; resp != NULL; resp = resp->ai_next) { + (*addresses)->naddrs++; + } + (*addresses)->addrs = + gpr_malloc(sizeof(grpc_resolved_address) * (*addresses)->naddrs); + i = 0; + for (resp = result; resp != NULL; resp = resp->ai_next) { + memcpy(&(*addresses)->addrs[i].addr, resp->ai_addr, resp->ai_addrlen); + (*addresses)->addrs[i].len = resp->ai_addrlen; + i++; + } + err = GRPC_ERROR_NONE; + +done: + gpr_free(host); + gpr_free(port); + if (result) { + freeaddrinfo(result); + } + return err; +} + +grpc_error *(*grpc_blocking_resolve_address)( + const char *name, const char *default_port, + grpc_resolved_addresses **addresses) = blocking_resolve_address_impl; + +typedef struct { + char *name; + char *default_port; + grpc_closure *on_done; + grpc_resolved_addresses **addrs_out; + grpc_closure request_closure; + void *arg; +} request; + +/* Callback to be passed to grpc_executor to asynch-ify + * grpc_blocking_resolve_address */ +static void do_request_thread(grpc_exec_ctx *exec_ctx, void *rp, + grpc_error *error) { + request *r = rp; + grpc_exec_ctx_sched( + exec_ctx, r->on_done, + grpc_blocking_resolve_address(r->name, r->default_port, r->addrs_out), + NULL); + gpr_free(r->name); + gpr_free(r->default_port); + gpr_free(r); +} + +void grpc_resolved_addresses_destroy(grpc_resolved_addresses *addrs) { + if (addrs != NULL) { + gpr_free(addrs->addrs); + } + gpr_free(addrs); +} + +static void resolve_address_impl(grpc_exec_ctx *exec_ctx, const char *name, + const char *default_port, + grpc_closure *on_done, + grpc_resolved_addresses **addrs) { + request *r = gpr_malloc(sizeof(request)); + grpc_closure_init(&r->request_closure, do_request_thread, r); + r->name = gpr_strdup(name); + r->default_port = gpr_strdup(default_port); + r->on_done = on_done; + r->addrs_out = addrs; + grpc_executor_push(&r->request_closure, GRPC_ERROR_NONE); +} + +void (*grpc_resolve_address)(grpc_exec_ctx *exec_ctx, const char *name, + const char *default_port, grpc_closure *on_done, + grpc_resolved_addresses **addrs) = + resolve_address_impl; + +#endif |