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getpeereid.c
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1 /*-------------------------------------------------------------------------
2  *
3  * getpeereid.c
4  * get peer userid for UNIX-domain socket connection
5  *
6  * Portions Copyright (c) 1996-2017, PostgreSQL Global Development Group
7  *
8  *
9  * IDENTIFICATION
10  * src/port/getpeereid.c
11  *
12  *-------------------------------------------------------------------------
13  */
14 
15 #include "c.h"
16 
17 #include <sys/param.h>
18 #include <sys/socket.h>
19 #include <unistd.h>
20 #ifdef HAVE_SYS_UN_H
21 #include <sys/un.h>
22 #endif
23 #ifdef HAVE_UCRED_H
24 #include <ucred.h>
25 #endif
26 #ifdef HAVE_SYS_UCRED_H
27 #include <sys/ucred.h>
28 #endif
29 
30 
31 /*
32  * BSD-style getpeereid() for platforms that lack it.
33  */
34 int
35 getpeereid(int sock, uid_t *uid, gid_t *gid)
36 {
37 #if defined(SO_PEERCRED)
38  /* Linux: use getsockopt(SO_PEERCRED) */
39  struct ucred peercred;
40  ACCEPT_TYPE_ARG3 so_len = sizeof(peercred);
41 
42  if (getsockopt(sock, SOL_SOCKET, SO_PEERCRED, &peercred, &so_len) != 0 ||
43  so_len != sizeof(peercred))
44  return -1;
45  *uid = peercred.uid;
46  *gid = peercred.gid;
47  return 0;
48 #elif defined(LOCAL_PEERCRED)
49  /* Debian with FreeBSD kernel: use getsockopt(LOCAL_PEERCRED) */
50  struct xucred peercred;
51  ACCEPT_TYPE_ARG3 so_len = sizeof(peercred);
52 
53  if (getsockopt(sock, 0, LOCAL_PEERCRED, &peercred, &so_len) != 0 ||
54  so_len != sizeof(peercred) ||
55  peercred.cr_version != XUCRED_VERSION)
56  return -1;
57  *uid = peercred.cr_uid;
58  *gid = peercred.cr_gid;
59  return 0;
60 #elif defined(HAVE_GETPEERUCRED)
61  /* Solaris: use getpeerucred() */
62  ucred_t *ucred;
63 
64  ucred = NULL; /* must be initialized to NULL */
65  if (getpeerucred(sock, &ucred) == -1)
66  return -1;
67 
68  *uid = ucred_geteuid(ucred);
69  *gid = ucred_getegid(ucred);
70  ucred_free(ucred);
71 
72  if (*uid == (uid_t) (-1) || *gid == (gid_t) (-1))
73  return -1;
74  return 0;
75 #else
76  /* No implementation available on this platform */
77  errno = ENOSYS;
78  return -1;
79 #endif
80 }
int getpeereid(int sock, uid_t *uid, gid_t *gid)
Definition: getpeereid.c:35
int uid_t
Definition: win32_port.h:241
int gid_t
Definition: win32_port.h:242