lib/libc/net/minix/getpeereid.c

   1 #include <errno.h>
   2 #include <string.h>
   3 #include <unistd.h>
   4 #include <sys/socket.h>
   5
   6 /*
   7  * get the effective user ID and effective group ID of a peer
   8  * connected through a Unix domain socket.
   9  */
  10 int getpeereid(int sd, uid_t *euid, gid_t *egid) {
  11         int rc;
  12         struct ucred cred;
  13         socklen_t ucred_length;
  14
  15         /* Initialize Data Structures */
  16         ucred_length = sizeof(struct ucred);
  17         memset(&cred, '\0', ucred_length);
  18
  19         /* Validate Input Parameters */
  20         if (euid == NULL || egid == NULL) {
  21                 errno = EFAULT;
  22                 return -1;
  23         } /* getsockopt will handle validating 'sd' */
  24
  25         /* Get the credentials of the peer at the other end of 'sd' */
  26         rc = getsockopt(sd, SOL_SOCKET, SO_PEERCRED, &cred, &ucred_length);
  27         if (rc == 0) {
  28                 /* Success - return the results */
  29                 *euid = cred.uid;
  30                 *egid = cred.gid;
  31                 return 0;
  32         } else {
  33                 /* Failure - getsockopt takes care of setting errno */
  34                 return -1;
  35         }
  36 }