1 /* 2 * 3 * Copyright 2016 gRPC authors. 4 * 5 * Licensed under the Apache License, Version 2.0 (the "License"); 6 * you may not use this file except in compliance with the License. 7 * You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 * 17 */ 18 #include <grpc/support/port_platform.h> 19 20 #include "src/core/lib/iomgr/port.h" 21 22 #ifdef GRPC_HAVE_UNIX_SOCKET 23 24 #include "src/core/lib/iomgr/sockaddr.h" 25 26 #include <string.h> 27 #include <sys/stat.h> 28 #include <sys/types.h> 29 #include <sys/un.h> 30 31 #include "src/core/lib/iomgr/unix_sockets_posix.h" 32 33 #include <grpc/support/alloc.h> 34 #include <grpc/support/log.h> 35 36 #include "src/core/lib/gpr/useful.h" 37 38 void grpc_create_socketpair_if_unix(int sv[2]) { 39 GPR_ASSERT(socketpair(AF_UNIX, SOCK_STREAM, 0, sv) == 0); 40 } 41 42 grpc_error* grpc_resolve_unix_domain_address(const char* name, 43 grpc_resolved_addresses** addrs) { 44 struct sockaddr_un* un; 45 if (strlen(name) > 46 GPR_ARRAY_SIZE(((struct sockaddr_un*)nullptr)->sun_path) - 1) { 47 char* err_msg; 48 grpc_error* err; 49 gpr_asprintf(&err_msg, 50 "Path name should not have more than %" PRIuPTR " characters.", 51 GPR_ARRAY_SIZE(un->sun_path) - 1); 52 err = GRPC_ERROR_CREATE_FROM_COPIED_STRING(err_msg); 53 gpr_free(err_msg); 54 return err; 55 } 56 *addrs = static_cast<grpc_resolved_addresses*>( 57 gpr_malloc(sizeof(grpc_resolved_addresses))); 58 (*addrs)->naddrs = 1; 59 (*addrs)->addrs = static_cast<grpc_resolved_address*>( 60 gpr_malloc(sizeof(grpc_resolved_address))); 61 un = reinterpret_cast<struct sockaddr_un*>((*addrs)->addrs->addr); 62 un->sun_family = AF_UNIX; 63 strncpy(un->sun_path, name, sizeof(un->sun_path)); 64 (*addrs)->addrs->len = 65 static_cast<socklen_t>(strlen(un->sun_path) + sizeof(un->sun_family) + 1); 66 return GRPC_ERROR_NONE; 67 } 68 69 int grpc_is_unix_socket(const grpc_resolved_address* resolved_addr) { 70 const grpc_sockaddr* addr = 71 reinterpret_cast<const grpc_sockaddr*>(resolved_addr->addr); 72 return addr->sa_family == AF_UNIX; 73 } 74 75 void grpc_unlink_if_unix_domain_socket( 76 const grpc_resolved_address* resolved_addr) { 77 const grpc_sockaddr* addr = 78 reinterpret_cast<const grpc_sockaddr*>(resolved_addr->addr); 79 if (addr->sa_family != AF_UNIX) { 80 return; 81 } 82 struct sockaddr_un* un = reinterpret_cast<struct sockaddr_un*>( 83 const_cast<char*>(resolved_addr->addr)); 84 struct stat st; 85 86 if (stat(un->sun_path, &st) == 0 && (st.st_mode & S_IFMT) == S_IFSOCK) { 87 unlink(un->sun_path); 88 } 89 } 90 91 char* grpc_sockaddr_to_uri_unix_if_possible( 92 const grpc_resolved_address* resolved_addr) { 93 const grpc_sockaddr* addr = 94 reinterpret_cast<const grpc_sockaddr*>(resolved_addr->addr); 95 if (addr->sa_family != AF_UNIX) { 96 return nullptr; 97 } 98 99 char* result; 100 gpr_asprintf(&result, "unix:%s", ((struct sockaddr_un*)addr)->sun_path); 101 return result; 102 } 103 104 #endif 105
