diff options
Diffstat (limited to 'grpc/src/core/lib/address_utils/sockaddr_utils.cc')
| -rw-r--r-- | grpc/src/core/lib/address_utils/sockaddr_utils.cc | 399 |
1 files changed, 399 insertions, 0 deletions
diff --git a/grpc/src/core/lib/address_utils/sockaddr_utils.cc b/grpc/src/core/lib/address_utils/sockaddr_utils.cc new file mode 100644 index 00000000..888cd1aa --- /dev/null +++ b/grpc/src/core/lib/address_utils/sockaddr_utils.cc @@ -0,0 +1,399 @@ +/* + * + * Copyright 2016 gRPC authors. + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + * + */ + +#include <grpc/support/port_platform.h> + +#include "src/core/lib/address_utils/sockaddr_utils.h" + +#include <errno.h> +#include <inttypes.h> +#include <string.h> + +#include <string> + +#include "absl/strings/str_cat.h" +#include "absl/strings/str_format.h" + +#include <grpc/support/alloc.h> +#include <grpc/support/log.h> + +#include "src/core/lib/gpr/string.h" +#include "src/core/lib/gprpp/host_port.h" +#include "src/core/lib/iomgr/sockaddr.h" +#include "src/core/lib/iomgr/socket_utils.h" +#include "src/core/lib/iomgr/unix_sockets_posix.h" + +static const uint8_t kV4MappedPrefix[] = {0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0xff, 0xff}; + +int grpc_sockaddr_is_v4mapped(const grpc_resolved_address* resolved_addr, + grpc_resolved_address* resolved_addr4_out) { + GPR_ASSERT(resolved_addr != resolved_addr4_out); + const grpc_sockaddr* addr = + reinterpret_cast<const grpc_sockaddr*>(resolved_addr->addr); + grpc_sockaddr_in* addr4_out = + resolved_addr4_out == nullptr + ? nullptr + : reinterpret_cast<grpc_sockaddr_in*>(resolved_addr4_out->addr); + if (addr->sa_family == GRPC_AF_INET6) { + const grpc_sockaddr_in6* addr6 = + reinterpret_cast<const grpc_sockaddr_in6*>(addr); + if (memcmp(addr6->sin6_addr.s6_addr, kV4MappedPrefix, + sizeof(kV4MappedPrefix)) == 0) { + if (resolved_addr4_out != nullptr) { + /* Normalize ::ffff:0.0.0.0/96 to IPv4. */ + memset(resolved_addr4_out, 0, sizeof(*resolved_addr4_out)); + addr4_out->sin_family = GRPC_AF_INET; + /* s6_addr32 would be nice, but it's non-standard. */ + memcpy(&addr4_out->sin_addr, &addr6->sin6_addr.s6_addr[12], 4); + addr4_out->sin_port = addr6->sin6_port; + resolved_addr4_out->len = + static_cast<socklen_t>(sizeof(grpc_sockaddr_in)); + } + return 1; + } + } + return 0; +} + +int grpc_sockaddr_to_v4mapped(const grpc_resolved_address* resolved_addr, + grpc_resolved_address* resolved_addr6_out) { + GPR_ASSERT(resolved_addr != resolved_addr6_out); + const grpc_sockaddr* addr = + reinterpret_cast<const grpc_sockaddr*>(resolved_addr->addr); + grpc_sockaddr_in6* addr6_out = + reinterpret_cast<grpc_sockaddr_in6*>(resolved_addr6_out->addr); + if (addr->sa_family == GRPC_AF_INET) { + const grpc_sockaddr_in* addr4 = + reinterpret_cast<const grpc_sockaddr_in*>(addr); + memset(resolved_addr6_out, 0, sizeof(*resolved_addr6_out)); + addr6_out->sin6_family = GRPC_AF_INET6; + memcpy(&addr6_out->sin6_addr.s6_addr[0], kV4MappedPrefix, 12); + memcpy(&addr6_out->sin6_addr.s6_addr[12], &addr4->sin_addr, 4); + addr6_out->sin6_port = addr4->sin_port; + resolved_addr6_out->len = static_cast<socklen_t>(sizeof(grpc_sockaddr_in6)); + return 1; + } + return 0; +} + +int grpc_sockaddr_is_wildcard(const grpc_resolved_address* resolved_addr, + int* port_out) { + const grpc_sockaddr* addr; + grpc_resolved_address addr4_normalized; + if (grpc_sockaddr_is_v4mapped(resolved_addr, &addr4_normalized)) { + resolved_addr = &addr4_normalized; + } + addr = reinterpret_cast<const grpc_sockaddr*>(resolved_addr->addr); + if (addr->sa_family == GRPC_AF_INET) { + /* Check for 0.0.0.0 */ + const grpc_sockaddr_in* addr4 = + reinterpret_cast<const grpc_sockaddr_in*>(addr); + if (addr4->sin_addr.s_addr != 0) { + return 0; + } + *port_out = grpc_ntohs(addr4->sin_port); + return 1; + } else if (addr->sa_family == GRPC_AF_INET6) { + /* Check for :: */ + const grpc_sockaddr_in6* addr6 = + reinterpret_cast<const grpc_sockaddr_in6*>(addr); + int i; + for (i = 0; i < 16; i++) { + if (addr6->sin6_addr.s6_addr[i] != 0) { + return 0; + } + } + *port_out = grpc_ntohs(addr6->sin6_port); + return 1; + } else { + return 0; + } +} + +void grpc_sockaddr_make_wildcards(int port, grpc_resolved_address* wild4_out, + grpc_resolved_address* wild6_out) { + grpc_sockaddr_make_wildcard4(port, wild4_out); + grpc_sockaddr_make_wildcard6(port, wild6_out); +} + +void grpc_sockaddr_make_wildcard4(int port, + grpc_resolved_address* resolved_wild_out) { + grpc_sockaddr_in* wild_out = + reinterpret_cast<grpc_sockaddr_in*>(resolved_wild_out->addr); + GPR_ASSERT(port >= 0 && port < 65536); + memset(resolved_wild_out, 0, sizeof(*resolved_wild_out)); + wild_out->sin_family = GRPC_AF_INET; + wild_out->sin_port = grpc_htons(static_cast<uint16_t>(port)); + resolved_wild_out->len = static_cast<socklen_t>(sizeof(grpc_sockaddr_in)); +} + +void grpc_sockaddr_make_wildcard6(int port, + grpc_resolved_address* resolved_wild_out) { + grpc_sockaddr_in6* wild_out = + reinterpret_cast<grpc_sockaddr_in6*>(resolved_wild_out->addr); + GPR_ASSERT(port >= 0 && port < 65536); + memset(resolved_wild_out, 0, sizeof(*resolved_wild_out)); + wild_out->sin6_family = GRPC_AF_INET6; + wild_out->sin6_port = grpc_htons(static_cast<uint16_t>(port)); + resolved_wild_out->len = static_cast<socklen_t>(sizeof(grpc_sockaddr_in6)); +} + +std::string grpc_sockaddr_to_string(const grpc_resolved_address* resolved_addr, + bool normalize) { + const int save_errno = errno; + grpc_resolved_address addr_normalized; + if (normalize && grpc_sockaddr_is_v4mapped(resolved_addr, &addr_normalized)) { + resolved_addr = &addr_normalized; + } + const grpc_sockaddr* addr = + reinterpret_cast<const grpc_sockaddr*>(resolved_addr->addr); + const void* ip = nullptr; + int port = 0; + uint32_t sin6_scope_id = 0; + if (addr->sa_family == GRPC_AF_INET) { + const grpc_sockaddr_in* addr4 = + reinterpret_cast<const grpc_sockaddr_in*>(addr); + ip = &addr4->sin_addr; + port = grpc_ntohs(addr4->sin_port); + } else if (addr->sa_family == GRPC_AF_INET6) { + const grpc_sockaddr_in6* addr6 = + reinterpret_cast<const grpc_sockaddr_in6*>(addr); + ip = &addr6->sin6_addr; + port = grpc_ntohs(addr6->sin6_port); + sin6_scope_id = addr6->sin6_scope_id; + } + char ntop_buf[GRPC_INET6_ADDRSTRLEN]; + std::string out; + if (ip != nullptr && grpc_inet_ntop(addr->sa_family, ip, ntop_buf, + sizeof(ntop_buf)) != nullptr) { + if (sin6_scope_id != 0) { + // Enclose sin6_scope_id with the format defined in RFC 6874 section 2. + std::string host_with_scope = + absl::StrFormat("%s%%25%" PRIu32, ntop_buf, sin6_scope_id); + out = grpc_core::JoinHostPort(host_with_scope, port); + } else { + out = grpc_core::JoinHostPort(ntop_buf, port); + } + } else { + out = absl::StrFormat("(sockaddr family=%d)", addr->sa_family); + } + /* This is probably redundant, but we wouldn't want to log the wrong error. */ + errno = save_errno; + return out; +} + +grpc_error_handle grpc_string_to_sockaddr(grpc_resolved_address* out, + const char* addr, int port) { + memset(out, 0, sizeof(grpc_resolved_address)); + grpc_sockaddr_in6* addr6 = reinterpret_cast<grpc_sockaddr_in6*>(out->addr); + grpc_sockaddr_in* addr4 = reinterpret_cast<grpc_sockaddr_in*>(out->addr); + if (grpc_inet_pton(GRPC_AF_INET6, addr, &addr6->sin6_addr) == 1) { + addr6->sin6_family = GRPC_AF_INET6; + out->len = sizeof(grpc_sockaddr_in6); + } else if (grpc_inet_pton(GRPC_AF_INET, addr, &addr4->sin_addr) == 1) { + addr4->sin_family = GRPC_AF_INET; + out->len = sizeof(grpc_sockaddr_in); + } else { + return GRPC_ERROR_CREATE_FROM_COPIED_STRING( + absl::StrCat("Failed to parse address:", addr).c_str()); + } + grpc_sockaddr_set_port(out, port); + return GRPC_ERROR_NONE; +} + +std::string grpc_sockaddr_to_uri(const grpc_resolved_address* resolved_addr) { + if (resolved_addr->len == 0) return ""; + grpc_resolved_address addr_normalized; + if (grpc_sockaddr_is_v4mapped(resolved_addr, &addr_normalized)) { + resolved_addr = &addr_normalized; + } + const char* scheme = grpc_sockaddr_get_uri_scheme(resolved_addr); + if (scheme == nullptr || strcmp("unix", scheme) == 0) { + return grpc_sockaddr_to_uri_unix_if_possible(resolved_addr); + } + std::string path = + grpc_sockaddr_to_string(resolved_addr, false /* normalize */); + std::string uri_str; + if (scheme != nullptr) { + uri_str = absl::StrCat(scheme, ":", path); + } + return uri_str; +} + +const char* grpc_sockaddr_get_uri_scheme( + const grpc_resolved_address* resolved_addr) { + const grpc_sockaddr* addr = + reinterpret_cast<const grpc_sockaddr*>(resolved_addr->addr); + switch (addr->sa_family) { + case GRPC_AF_INET: + return "ipv4"; + case GRPC_AF_INET6: + return "ipv6"; + case GRPC_AF_UNIX: + return "unix"; + } + return nullptr; +} + +int grpc_sockaddr_get_family(const grpc_resolved_address* resolved_addr) { + const grpc_sockaddr* addr = + reinterpret_cast<const grpc_sockaddr*>(resolved_addr->addr); + return addr->sa_family; +} + +int grpc_sockaddr_get_port(const grpc_resolved_address* resolved_addr) { + const grpc_sockaddr* addr = + reinterpret_cast<const grpc_sockaddr*>(resolved_addr->addr); + switch (addr->sa_family) { + case GRPC_AF_INET: + return grpc_ntohs( + (reinterpret_cast<const grpc_sockaddr_in*>(addr))->sin_port); + case GRPC_AF_INET6: + return grpc_ntohs( + (reinterpret_cast<const grpc_sockaddr_in6*>(addr))->sin6_port); + default: + if (grpc_is_unix_socket(resolved_addr)) { + return 1; + } + gpr_log(GPR_ERROR, "Unknown socket family %d in grpc_sockaddr_get_port", + addr->sa_family); + return 0; + } +} + +int grpc_sockaddr_set_port(grpc_resolved_address* resolved_addr, int port) { + grpc_sockaddr* addr = reinterpret_cast<grpc_sockaddr*>(resolved_addr->addr); + switch (addr->sa_family) { + case GRPC_AF_INET: + GPR_ASSERT(port >= 0 && port < 65536); + (reinterpret_cast<grpc_sockaddr_in*>(addr))->sin_port = + grpc_htons(static_cast<uint16_t>(port)); + return 1; + case GRPC_AF_INET6: + GPR_ASSERT(port >= 0 && port < 65536); + (reinterpret_cast<grpc_sockaddr_in6*>(addr))->sin6_port = + grpc_htons(static_cast<uint16_t>(port)); + return 1; + default: + gpr_log(GPR_ERROR, "Unknown socket family %d in grpc_sockaddr_set_port", + addr->sa_family); + return 0; + } +} + +std::string grpc_sockaddr_get_packed_host( + const grpc_resolved_address* resolved_addr) { + const grpc_sockaddr* addr = + reinterpret_cast<const grpc_sockaddr*>(resolved_addr->addr); + if (addr->sa_family == GRPC_AF_INET) { + const grpc_sockaddr_in* addr4 = + reinterpret_cast<const grpc_sockaddr_in*>(addr); + const char* addr_bytes = reinterpret_cast<const char*>(&addr4->sin_addr); + return std::string(addr_bytes, 4); + } else if (addr->sa_family == GRPC_AF_INET6) { + const grpc_sockaddr_in6* addr6 = + reinterpret_cast<const grpc_sockaddr_in6*>(addr); + const char* addr_bytes = reinterpret_cast<const char*>(&addr6->sin6_addr); + return std::string(addr_bytes, 16); + } else { + GPR_ASSERT(false); + } +} + +void grpc_sockaddr_mask_bits(grpc_resolved_address* address, + uint32_t mask_bits) { + grpc_sockaddr* addr = reinterpret_cast<grpc_sockaddr*>(address->addr); + if (addr->sa_family == GRPC_AF_INET) { + grpc_sockaddr_in* addr4 = reinterpret_cast<grpc_sockaddr_in*>(addr); + if (mask_bits == 0) { + memset(&addr4->sin_addr, 0, sizeof(addr4->sin_addr)); + return; + } else if (mask_bits >= 32) { + return; + } + uint32_t mask_ip_addr = (~(uint32_t(0))) << (32 - mask_bits); + addr4->sin_addr.s_addr &= grpc_htonl(mask_ip_addr); + } else if (addr->sa_family == GRPC_AF_INET6) { + grpc_sockaddr_in6* addr6 = reinterpret_cast<grpc_sockaddr_in6*>(addr); + if (mask_bits == 0) { + memset(&addr6->sin6_addr, 0, sizeof(addr6->sin6_addr)); + return; + } else if (mask_bits >= 128) { + return; + } + // We cannot use s6_addr32 since it is not defined on all platforms that we + // need it on. + uint32_t address_parts[4]; + GPR_ASSERT(sizeof(addr6->sin6_addr) == sizeof(address_parts)); + memcpy(address_parts, &addr6->sin6_addr, sizeof(grpc_in6_addr)); + if (mask_bits <= 32) { + uint32_t mask_ip_addr = (~(uint32_t(0))) << (32 - mask_bits); + address_parts[0] &= grpc_htonl(mask_ip_addr); + memset(&address_parts[1], 0, sizeof(uint32_t)); + memset(&address_parts[2], 0, sizeof(uint32_t)); + memset(&address_parts[3], 0, sizeof(uint32_t)); + } else if (mask_bits <= 64) { + mask_bits -= 32; + uint32_t mask_ip_addr = (~(uint32_t(0))) << (32 - mask_bits); + address_parts[1] &= grpc_htonl(mask_ip_addr); + memset(&address_parts[2], 0, sizeof(uint32_t)); + memset(&address_parts[3], 0, sizeof(uint32_t)); + } else if (mask_bits <= 96) { + mask_bits -= 64; + uint32_t mask_ip_addr = (~(uint32_t(0))) << (32 - mask_bits); + address_parts[2] &= grpc_htonl(mask_ip_addr); + memset(&address_parts[3], 0, sizeof(uint32_t)); + } else { + mask_bits -= 96; + uint32_t mask_ip_addr = (~(uint32_t(0))) << (32 - mask_bits); + address_parts[3] &= grpc_htonl(mask_ip_addr); + } + memcpy(&addr6->sin6_addr, address_parts, sizeof(grpc_in6_addr)); + } +} + +bool grpc_sockaddr_match_subnet(const grpc_resolved_address* address, + const grpc_resolved_address* subnet_address, + uint32_t mask_bits) { + auto* addr = reinterpret_cast<const grpc_sockaddr*>(address->addr); + auto* subnet_addr = + reinterpret_cast<const grpc_sockaddr*>(subnet_address->addr); + if (addr->sa_family != subnet_addr->sa_family) return false; + grpc_resolved_address masked_address; + memcpy(&masked_address, address, sizeof(grpc_resolved_address)); + addr = reinterpret_cast<grpc_sockaddr*>((&masked_address)->addr); + grpc_sockaddr_mask_bits(&masked_address, mask_bits); + if (addr->sa_family == GRPC_AF_INET) { + auto* addr4 = reinterpret_cast<const grpc_sockaddr_in*>(addr); + auto* subnet_addr4 = reinterpret_cast<const grpc_sockaddr_in*>(subnet_addr); + if (memcmp(&addr4->sin_addr, &subnet_addr4->sin_addr, + sizeof(addr4->sin_addr)) == 0) { + return true; + } + } else if (addr->sa_family == GRPC_AF_INET6) { + auto* addr6 = reinterpret_cast<const grpc_sockaddr_in6*>(addr); + auto* subnet_addr6 = + reinterpret_cast<const grpc_sockaddr_in6*>(subnet_addr); + if (memcmp(&addr6->sin6_addr, &subnet_addr6->sin6_addr, + sizeof(addr6->sin6_addr)) == 0) { + return true; + } + } + return false; +} |