Problem - Kevin Tafuro

#ifdef LOCAL_CREDS
nb = 1;
if (setsockopt(sd, 0, LOCAL_CREDS, &nb, sizeof(nb)) == -1) return 0;
#else
#ifdef SO_PASSCRED
nb = 1;
if (setsockopt(sd, SOL_SOCKET, SO_PASSCRED, &nb, sizeof(nb)) == -1)
return 0;
#endif
#endif
do {
msg.msg_iov->iov_base = (void *)&sync;
msg.msg_iov->iov_len = sizeof(sync);
nb = recvmsg(sd, &msg, 0);
} while (nb == -1 && (errno == EINTR || errno == EAGAIN));
if (nb == -1) return 0;
if (msg.msg_controllen < sizeof(struct cmsghdr)) return 0;
cmptr = CMSG_FIRSTHDR(&msg);
#ifndef __NetBSD__
size = sizeof(spc_credentials);
#else
if (cmptr->cmsg_len < SOCKCREDSIZE(0)) return 0;
size = SOCKCREDSIZE(((cred *)CMSG_DATA(cmptr))->sc_ngroups);
#endif
if (cmptr->cmsg_len != CMSG_LEN(size)) return 0;
if (cmptr->cmsg_level != SOL_SOCKET) return 0;
if (cmptr->cmsg_type != SCM_CREDS) return 0;
if (!(credentials = (spc_credentials *)malloc(size))) return 0;
*credentials = *(spc_credentials *)CMSG_DATA(cmptr);
return credentials;
}
int spc_send_credentials(int sd) {
int sync = 0x11223344;
struct iovec iov[1] = { { 0, 0, } };
struct msghdr msg = { 0, 0, iov, 1, 0, 0, 0 };
#if !defined(linux) && !defined(__NetBSD__)
char ctrl[CMSG_SPACE(sizeof(spc_credentials))];
struct cmsghdr *cmptr;
msg.msg_control = ctrl;
msg.msg_controllen = sizeof(ctrl);
cmptr = CMSG_FIRSTHDR(&msg);
cmptr->cmsg_len = CMSG_LEN(sizeof(spc_credentials));
cmptr->cmsg_level = SOL_SOCKET;
cmptr->cmsg_type = SCM_CREDS;
memset(CMSG_DATA(cmptr), 0, sizeof(spc_credentials));
#endif
484 | Chapter 9: Networking
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