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/*-------------------------------------------------------------------------
*
* getpeereid.c
* get peer userid for UNIX-domain socket connection
*
* Portions Copyright (c) 1996-2024, PostgreSQL Global Development Group
*
*
* IDENTIFICATION
* src/port/getpeereid.c
*
*-------------------------------------------------------------------------
*/
#include "c.h"
#include <sys/param.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <unistd.h>
#ifdef HAVE_UCRED_H
#include <ucred.h>
#endif
#ifdef HAVE_SYS_UCRED_H
#include <sys/ucred.h>
#endif
/*
* BSD-style getpeereid() for platforms that lack it.
*/
int
getpeereid(int sock, uid_t *uid, gid_t *gid)
{
#if defined(SO_PEERCRED)
/* Linux: use getsockopt(SO_PEERCRED) */
struct ucred peercred;
socklen_t so_len = sizeof(peercred);
if (getsockopt(sock, SOL_SOCKET, SO_PEERCRED, &peercred, &so_len) != 0 ||
so_len != sizeof(peercred))
return -1;
*uid = peercred.uid;
*gid = peercred.gid;
return 0;
#elif defined(LOCAL_PEERCRED)
/* Debian with FreeBSD kernel: use getsockopt(LOCAL_PEERCRED) */
struct xucred peercred;
socklen_t so_len = sizeof(peercred);
if (getsockopt(sock, 0, LOCAL_PEERCRED, &peercred, &so_len) != 0 ||
so_len != sizeof(peercred) ||
peercred.cr_version != XUCRED_VERSION)
return -1;
*uid = peercred.cr_uid;
*gid = peercred.cr_gid;
return 0;
#elif defined(HAVE_GETPEERUCRED)
/* Solaris: use getpeerucred() */
ucred_t *ucred;
ucred = NULL; /* must be initialized to NULL */
if (getpeerucred(sock, &ucred) == -1)
return -1;
*uid = ucred_geteuid(ucred);
*gid = ucred_getegid(ucred);
ucred_free(ucred);
if (*uid == (uid_t) (-1) || *gid == (gid_t) (-1))
return -1;
return 0;
#else
/* No implementation available on this platform */
errno = ENOSYS;
return -1;
#endif
}
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