1 /** 2 * Copyright © 2016 IBM Corporation 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #include "console-server.h" 18 19 #include <errno.h> 20 #include <stdio.h> 21 #include <stdlib.h> 22 #include <sys/socket.h> 23 #include <sys/un.h> 24 #include <sys/types.h> 25 26 #define CONSOLE_SOCKET_PREFIX "obmc-console" 27 28 ssize_t console_socket_path(struct sockaddr_un *addr, const char *id) 29 { 30 char *sun_path; 31 ssize_t rc; 32 33 sun_path = (char *)addr + sizeof(*addr) - sizeof(addr->sun_path); 34 35 if (id) { 36 rc = snprintf(sun_path + 1, sizeof(addr->sun_path) - 1, 37 CONSOLE_SOCKET_PREFIX ".%s", id); 38 } else { 39 rc = snprintf(sun_path + 1, sizeof(addr->sun_path) - 1, 40 CONSOLE_SOCKET_PREFIX); 41 } 42 43 if (rc < 0) 44 return rc; 45 46 if (rc > (sizeof(addr->sun_path) - 1)) { 47 errno = 0; 48 return -1; 49 } 50 51 sun_path[0] = '\0'; 52 53 return rc + 1 /* Capture NUL prefix */; 54 } 55 56 ssize_t console_socket_path_readable(const struct sockaddr_un *addr, 57 size_t addrlen, socket_path_t path) 58 { 59 const char *src = (const char *)addr; 60 const size_t len = addrlen - sizeof(addr->sun_family) - 1; 61 62 memcpy(path, src + sizeof(addr->sun_family) + 1, len); 63 path[len] = '\0'; 64 65 return len; /* strlen() style */ 66 } 67