/* * * 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 "src/core/lib/iomgr/sockaddr_utils.h" #include #include #include #include #include #include #include #include #include "src/core/lib/iomgr/sockaddr.h" #include "src/core/lib/iomgr/socket_utils.h" #include "src/core/lib/iomgr/unix_sockets_posix.h" #include "src/core/lib/support/string.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 struct sockaddr* addr = (const struct sockaddr*)resolved_addr->addr; struct sockaddr_in* addr4_out = resolved_addr4_out == nullptr ? nullptr : (struct sockaddr_in*)resolved_addr4_out->addr; if (addr->sa_family == AF_INET6) { const struct sockaddr_in6* addr6 = (const struct 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 = 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 = sizeof(struct 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 struct sockaddr* addr = (const struct sockaddr*)resolved_addr->addr; struct sockaddr_in6* addr6_out = (struct sockaddr_in6*)resolved_addr6_out->addr; if (addr->sa_family == AF_INET) { const struct sockaddr_in* addr4 = (const struct sockaddr_in*)addr; memset(resolved_addr6_out, 0, sizeof(*resolved_addr6_out)); addr6_out->sin6_family = 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 = sizeof(struct sockaddr_in6); return 1; } return 0; } int grpc_sockaddr_is_wildcard(const grpc_resolved_address* resolved_addr, int* port_out) { const struct sockaddr* addr; grpc_resolved_address addr4_normalized; if (grpc_sockaddr_is_v4mapped(resolved_addr, &addr4_normalized)) { resolved_addr = &addr4_normalized; } addr = (const struct sockaddr*)resolved_addr->addr; if (addr->sa_family == AF_INET) { /* Check for 0.0.0.0 */ const struct sockaddr_in* addr4 = (const struct sockaddr_in*)addr; if (addr4->sin_addr.s_addr != 0) { return 0; } *port_out = ntohs(addr4->sin_port); return 1; } else if (addr->sa_family == AF_INET6) { /* Check for :: */ const struct sockaddr_in6* addr6 = (const struct sockaddr_in6*)addr; int i; for (i = 0; i < 16; i++) { if (addr6->sin6_addr.s6_addr[i] != 0) { return 0; } } *port_out = 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) { struct sockaddr_in* wild_out = (struct 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 = AF_INET; wild_out->sin_port = htons((uint16_t)port); resolved_wild_out->len = sizeof(struct sockaddr_in); } void grpc_sockaddr_make_wildcard6(int port, grpc_resolved_address* resolved_wild_out) { struct sockaddr_in6* wild_out = (struct 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 = AF_INET6; wild_out->sin6_port = htons((uint16_t)port); resolved_wild_out->len = sizeof(struct sockaddr_in6); } int grpc_sockaddr_to_string(char** out, const grpc_resolved_address* resolved_addr, int normalize) { const struct sockaddr* addr; const int save_errno = errno; grpc_resolved_address addr_normalized; char ntop_buf[INET6_ADDRSTRLEN]; const void* ip = nullptr; int port = 0; uint32_t sin6_scope_id = 0; int ret; *out = nullptr; if (normalize && grpc_sockaddr_is_v4mapped(resolved_addr, &addr_normalized)) { resolved_addr = &addr_normalized; } addr = (const struct sockaddr*)resolved_addr->addr; if (addr->sa_family == AF_INET) { const struct sockaddr_in* addr4 = (const struct sockaddr_in*)addr; ip = &addr4->sin_addr; port = ntohs(addr4->sin_port); } else if (addr->sa_family == AF_INET6) { const struct sockaddr_in6* addr6 = (const struct sockaddr_in6*)addr; ip = &addr6->sin6_addr; port = ntohs(addr6->sin6_port); sin6_scope_id = addr6->sin6_scope_id; } if (ip != nullptr && grpc_inet_ntop(addr->sa_family, ip, ntop_buf, sizeof(ntop_buf)) != nullptr) { if (sin6_scope_id != 0) { char* host_with_scope; /* Enclose sin6_scope_id with the format defined in RFC 6784 section 2. */ gpr_asprintf(&host_with_scope, "%s%%25%" PRIu32, ntop_buf, sin6_scope_id); ret = gpr_join_host_port(out, host_with_scope, port); gpr_free(host_with_scope); } else { ret = gpr_join_host_port(out, ntop_buf, port); } } else { ret = gpr_asprintf(out, "(sockaddr family=%d)", addr->sa_family); } /* This is probably redundant, but we wouldn't want to log the wrong error. */ errno = save_errno; return ret; } char* grpc_sockaddr_to_uri(const grpc_resolved_address* resolved_addr) { 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); } char* path = nullptr; char* uri_str = nullptr; if (grpc_sockaddr_to_string(&path, resolved_addr, false /* suppress errors */) && scheme != nullptr) { gpr_asprintf(&uri_str, "%s:%s", scheme, path); } gpr_free(path); return uri_str != nullptr ? uri_str : nullptr; } const char* grpc_sockaddr_get_uri_scheme( const grpc_resolved_address* resolved_addr) { const struct sockaddr* addr = (const struct sockaddr*)resolved_addr->addr; switch (addr->sa_family) { case AF_INET: return "ipv4"; case AF_INET6: return "ipv6"; case AF_UNIX: return "unix"; } return nullptr; } int grpc_sockaddr_get_family(const grpc_resolved_address* resolved_addr) { const struct sockaddr* addr = (const struct sockaddr*)resolved_addr->addr; return addr->sa_family; } int grpc_sockaddr_get_port(const grpc_resolved_address* resolved_addr) { const struct sockaddr* addr = (const struct sockaddr*)resolved_addr->addr; switch (addr->sa_family) { case AF_INET: return ntohs(((struct sockaddr_in*)addr)->sin_port); case AF_INET6: return ntohs(((struct 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(const grpc_resolved_address* resolved_addr, int port) { const struct sockaddr* addr = (const struct sockaddr*)resolved_addr->addr; switch (addr->sa_family) { case AF_INET: GPR_ASSERT(port >= 0 && port < 65536); ((struct sockaddr_in*)addr)->sin_port = htons((uint16_t)port); return 1; case AF_INET6: GPR_ASSERT(port >= 0 && port < 65536); ((struct sockaddr_in6*)addr)->sin6_port = htons((uint16_t)port); return 1; default: gpr_log(GPR_ERROR, "Unknown socket family %d in grpc_sockaddr_set_port", addr->sa_family); return 0; } }