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/* See LICENSE file for copyright and license details. */
#include "common.h"
USAGE("[-a] path")
static void
esend_fd(int sock, int fd)
{
char buf[1];
struct iovec iov;
struct msghdr msg;
struct cmsghdr *cmsg;
char cms[CMSG_SPACE(sizeof(fd))];
buf[0] = 0;
iov.iov_base = buf;
iov.iov_len = 1;
memset(&msg, 0, sizeof(msg));
msg.msg_iov = &iov;
msg.msg_iovlen = 1;
msg.msg_control = (caddr_t)cms;
msg.msg_controllen = CMSG_LEN(sizeof(fd));
cmsg = CMSG_FIRSTHDR(&msg);
cmsg->cmsg_len = CMSG_LEN(sizeof(fd));
cmsg->cmsg_level = SOL_SOCKET;
cmsg->cmsg_type = SCM_RIGHTS;
memcpy(CMSG_DATA(cmsg), &fd, sizeof(fd));
if (sendmsg(sock, &msg, 0) != iov.iov_len)
eprintf("sendmsg:");
}
int
main(int argc, char *argv[])
{
struct sockaddr_un addr;
int abstract = 0;
int serverfd, connfd;
ARGBEGIN {
case 'a':
abstract = 1;
break;
default:
usage();
} ARGEND;
if (argc != 1)
usage();
memset(&addr, 0, sizeof(addr));
addr.sun_family = AF_UNIX;
if (strlen(argv[0]) + 1 + abstract > sizeof(addr.sun_path)) {
errno = ENAMETOOLONG;
eprintf("%s:", argv[0]);
}
strcpy(addr.sun_path + abstract, argv[0]);
serverfd = socket(PF_UNIX, SOCK_SEQPACKET, 0);
if (serverfd < 0)
eprintf("socket PF_UNIX SOCK_SEQPACKET:");
if (bind(serverfd, (const struct sockaddr *)&addr, (size_t)sizeof(addr)) < 0)
eprintf("bind %s%s%s:",
abstract ? "<abstract:" : "",
addr.sun_path + abstract,
abstract ? ">" : "");
if (listen(serverfd, 1) < 0)
eprintf("listen:");
connfd = accept(serverfd, NULL, NULL);
if (connfd < 0)
eprintf("accept:");
if (*addr.sun_path)
unlink(addr.sun_path);
close(serverfd);
esend_fd(connfd, STDIN_FILENO);
close(connfd);
return 0;
}
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