38 lines
976 B
C
38 lines
976 B
C
#include "sendfd.h"
|
|
#include "sys/socket.h" /* cmsghdr */
|
|
#include "stdio.h" /* perror */
|
|
|
|
|
|
ssize_t send_fd(int dst_fd, int fd, const struct iovec *iov) {
|
|
struct msghdr msg = { 0 };
|
|
|
|
/* openssh expects to receive a dummy length=1 iovec? */
|
|
char ch = 0;
|
|
struct iovec vecDefault = { 0 };
|
|
vecDefault.iov_base = &ch;
|
|
vecDefault.iov_len = 1;
|
|
msg.msg_iov = iov == NULL ? &vecDefault : iov;
|
|
msg.msg_iovlen = 1;
|
|
|
|
union {
|
|
struct cmsghdr align;
|
|
char buf[CMSG_SPACE(sizeof(int))];
|
|
} u;
|
|
|
|
msg.msg_control = u.buf;
|
|
msg.msg_controllen = sizeof(u.buf);
|
|
|
|
struct cmsghdr *cmptr;
|
|
cmptr = CMSG_FIRSTHDR(&msg);
|
|
|
|
if (cmptr == NULL) {
|
|
perror("ch-proxy/send_fd/CMSG_FIRSTHDR: failed to initialize msg_control\n");
|
|
}
|
|
|
|
cmptr->cmsg_len = CMSG_LEN(sizeof(int));
|
|
cmptr->cmsg_level = SOL_SOCKET;
|
|
cmptr->cmsg_type = SCM_RIGHTS;
|
|
*((int*) CMSG_DATA(cmptr)) = fd;
|
|
|
|
return (sendmsg(dst_fd, &msg, 0));
|
|
}
|