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 <err.h> 20 #include <errno.h> 21 #include <limits.h> 22 #include <stdio.h> 23 #include <stdlib.h> 24 #include <sys/socket.h> 25 #include <sys/un.h> 26 #include <sys/types.h> 27 #include <unistd.h> 28 29 #define CONSOLE_SOCKET_PREFIX "obmc-console" 30 31 /* Build the socket path. */ 32 ssize_t console_socket_path(socket_path_t sun_path, const char *id) 33 { 34 ssize_t rc; 35 36 if (!id) { 37 errno = EINVAL; 38 return -1; 39 } 40 41 rc = snprintf(sun_path + 1, sizeof(socket_path_t) - 1, 42 CONSOLE_SOCKET_PREFIX ".%s", id); 43 if (rc < 0) { 44 return rc; 45 } 46 47 if ((size_t)rc > (sizeof(socket_path_t) - 1)) { 48 errno = 0; 49 return -1; 50 } 51 52 sun_path[0] = '\0'; 53 54 return rc + 1 /* Capture NUL prefix */; 55 } 56 57 ssize_t console_socket_path_readable(const struct sockaddr_un *addr, 58 size_t addrlen, socket_path_t path) 59 { 60 const char *src = (const char *)addr; 61 size_t len; 62 63 if (addrlen > SSIZE_MAX) { 64 return -EINVAL; 65 } 66 67 len = addrlen - sizeof(addr->sun_family) - 1; 68 memcpy(path, src + sizeof(addr->sun_family) + 1, len); 69 path[len] = '\0'; 70 71 return (ssize_t)len; /* strlen() style */ 72 } 73