37 lines
892 B
C
37 lines
892 B
C
#include <errno.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
#include <sys/socket.h>
|
|
|
|
/*
|
|
* get the effective user ID and effective group ID of a peer
|
|
* connected through a Unix domain socket.
|
|
*/
|
|
int getpeereid(int sd, uid_t *euid, gid_t *egid) {
|
|
int rc;
|
|
struct uucred cred;
|
|
socklen_t ucred_length;
|
|
|
|
/* Initialize Data Structures */
|
|
ucred_length = sizeof(struct uucred);
|
|
memset(&cred, '\0', ucred_length);
|
|
|
|
/* Validate Input Parameters */
|
|
if (euid == NULL || egid == NULL) {
|
|
errno = EFAULT;
|
|
return -1;
|
|
} /* getsockopt will handle validating 'sd' */
|
|
|
|
/* Get the credentials of the peer at the other end of 'sd' */
|
|
rc = getsockopt(sd, SOL_SOCKET, SO_PEERCRED, &cred, &ucred_length);
|
|
if (rc == 0) {
|
|
/* Success - return the results */
|
|
*euid = cred.cr_uid;
|
|
*egid = cred.cr_gid;
|
|
return 0;
|
|
} else {
|
|
/* Failure - getsockopt takes care of setting errno */
|
|
return -1;
|
|
}
|
|
}
|