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/*
* Copyright (c) 2002,2004 Damien Miller <djm@mindrot.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <config.h>
#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <sys/param.h>
#if !defined(HAVE_GETPEEREID)
#if defined(SO_PEERCRED)
int
getpeereid(int s, uid_t *euid, gid_t *gid)
{
struct ucred cred;
socklen_t len = sizeof(cred);
if (getsockopt(s, SOL_SOCKET, SO_PEERCRED, &cred, &len) < 0)
return (-1);
*euid = cred.uid;
*gid = cred.gid;
return (0);
}
#elif defined(LOCAL_CREDS) /* NetBSD */
int
getpeereid(int s, uid_t *euid, gid_t *gid)
{
/* Credentials structure */
#ifdef __NetBSD__ /* XXX: should use autoconf */
#define HAVE_STRUCT_SOCKCRED
#endif
#if defined(HAVE_STRUCT_CMSGCRED)
typedef struct cmsgcred Cred;
#define cruid cmcred_euid
#define crgid cmcred_groups[0]
#elif defined(HAVE_STRUCT_FCRED)
typedef struct fcred Cred;
#define cruid fc_uid
#define crgid fc_gid
#elif defined(HAVE_STRUCT_SOCKCRED)
typedef struct sockcred Cred;
#define cruid sc_euid
#define crgid sc_egid
#endif
Cred *cred;
/* Compute size without padding */
char cmsgmem[CMSG_SPACE(sizeof(Cred))]; /* for NetBSD */
/* Point to start of first structure */
struct cmsghdr *cmsg = (struct cmsghdr *)cmsgmem;
struct iovec iov;
char buf;
struct msghdr msg;
memset(&msg, 0, sizeof(msg));
msg.msg_iov = &iov;
msg.msg_iovlen = 1;
msg.msg_control = (char *)cmsg;
msg.msg_controllen = sizeof(cmsgmem);
memset(cmsg, 0, sizeof(cmsgmem));
/*
* The one character which is received here is not meaningful; its
* purposes is only to make sure that recvmsg() blocks long enough for
* the other side to send its credentials.
*/
iov.iov_base = &buf;
iov.iov_len = 1;
if (recvmsg(s, &msg, 0) < 0 ||
cmsg->cmsg_len < sizeof(cmsgmem) ||
cmsg->cmsg_type != SCM_CREDS)
{
return -1;
}
cred = (Cred *)CMSG_DATA(cmsg);
*euid = cred->cruid;
*gid = cred->crgid;
return 0;
}
#else
int
getpeereid(int s, uid_t *euid, gid_t *gid)
{
*euid = geteuid();
*gid = getgid();
return (0);
}
#endif /* defined(SO_PEERCRED) */
#endif /* !defined(HAVE_GETPEEREID) */
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