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GETPEEREID(3) | Library Functions Manual | GETPEEREID(3) |
NAME¶
getpeereid — get the effective credentials of a UNIX-domain peerLIBRARY¶
library “libbsd”SYNOPSIS¶
#include <sys/types.h>#include <bsd/unistd.h> int
getpeereid(int s, uid_t *euid, gid_t *egid);
DESCRIPTION¶
The getpeereid() function returns the effective user and group IDs of the peer connected to a UNIX-domain socket. The argument s must be a UNIX-domain socket (unix(4)) of typeSOCK_STREAM
on which either connect(2) or listen(2)
have been called. The effective used ID is placed in
euid, and the effective group ID in
egid.
The credentials returned to the listen(2) caller are those of
its peer at the time it called connect(2); the credentials
returned to the connect(2) caller are those of its peer at
the time it called listen(2). This mechanism is reliable;
there is no way for either side to influence the credentials returned to its
peer except by calling the appropriate system call (i.e., either
connect(2) or listen(2)) under different
effective credentials.
One common use of this routine is for a UNIX-domain
server to verify the credentials of its client. Likewise, the client can
verify the credentials of the server.
IMPLEMENTATION NOTES¶
On FreeBSD, getpeereid() is implemented in terms of theLOCAL_PEERCRED
unix(4) socket option.
RETURN VALUES¶
The getpeereid() function returns the value 0 if successful; otherwise the value -1 is returned and the global variable errno is set to indicate the error.ERRORS¶
The getpeereid() function fails if:- [
EBADF
] - The argument s is not a valid descriptor.
- [
ENOTSOCK
] - The argument s is a file, not a socket.
- [
ENOTCONN
] - The argument s does not refer to a socket on which connect(2) or listen(2) have been called.
- [
EINVAL
] - The argument s does not refer to a
socket of type
SOCK_STREAM
, or the kernel returned invalid data.
SEE ALSO¶
connect(2), getpeername(2), getsockname(2), getsockopt(2), listen(2), unix(4)HISTORY¶
The getpeereid() function appeared in FreeBSD 4.6.July 15, 2001 | Debian |