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