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. */
console_socket_path(socket_path_t sun_path,const char * id)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
console_socket_path_readable(const struct sockaddr_un * addr,size_t addrlen,socket_path_t path)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