int send_fds(int sock, struct sockaddr_un *saddr, int len,
int *fds, int nr_fds, bool with_flags)
{
struct scm_fdset fdset;
int *cmsg_data;
int i, min_fd, ret;
cmsg_data = scm_fdset_init(&fdset, saddr, len, with_flags);
for (i = 0; i < nr_fds; i += min_fd) {
min_fd = min(CR_SCM_MAX_FD, nr_fds - i);
scm_fdset_init_chunk(&fdset, min_fd);
builtin_memcpy(cmsg_data, &fds[i], sizeof(int) * min_fd);
if (with_flags) {
int j;
for (j = 0; j < min_fd; j++) {
int flags, fd = fds[i + j];
struct fd_opts *p = fdset.opts + j;
struct f_owner_ex owner_ex;
u32 v[2];
flags = sys_fcntl(fd, F_GETFD, 0);
if (flags < 0)
return -1;
p->flags = (char)flags;
if (sys_fcntl(fd, F_GETOWN_EX, (long)&owner_ex))
return -1;
/*
* Simple case -- nothing is changed.
*/
if (owner_ex.pid == 0) {
p->fown.pid = 0;
continue;
}
if (sys_fcntl(fd, F_GETOWNER_UIDS, (long)&v))
return -1;
p->fown.uid = v[0];
p->fown.euid = v[1];
p->fown.pid_type = owner_ex.type;
p->fown.pid = owner_ex.pid;
}
}
ret = sys_sendmsg(sock, &fdset.hdr, 0);
if (ret <= 0)
return ret ? : -1;
}
return 0;
}
int recv_fds(int sock, int *fds, int nr_fds, struct fd_opts *opts)
{
struct scm_fdset fdset;
struct cmsghdr *cmsg;
int *cmsg_data;
int ret;
int i, min_fd;
cmsg_data = scm_fdset_init(&fdset, NULL, 0, opts != NULL);
for (i = 0; i < nr_fds; i += min_fd) {
min_fd = min(CR_SCM_MAX_FD, nr_fds - i);
scm_fdset_init_chunk(&fdset, min_fd, opts != NULL);
ret = __sys(recvmsg)(sock, &fdset.hdr, 0);
if (ret <= 0)
return ret ? : -1;
cmsg = CMSG_FIRSTHDR(&fdset.hdr);
if (!cmsg || cmsg->cmsg_type != SCM_RIGHTS)
return -EINVAL;
if (fdset.hdr.msg_flags & MSG_CTRUNC)
return -ENFILE;
min_fd = (cmsg->cmsg_len - sizeof(struct cmsghdr)) / sizeof(int);
/*
* In case if kernel screwed the recipient, most probably
* the caller stack frame will be overwriten, just scream
* and exit.
*
* FIXME Need to sanitize util.h to be able to include it
* into files which do not have glibc and a couple of
* sys_write_ helpers. Meawhile opencoded BUG_ON here.
*/
BUG_ON(min_fd > CR_SCM_MAX_FD);
if (unlikely(min_fd <= 0))
return -1;
__memcpy(&fds[i], cmsg_data, sizeof(int) * min_fd);
#ifdef SCM_FDSET_HAS_OPTS
if (opts)
__memcpy(opts + i, fdset.opts, sizeof(struct fd_opts) * min_fd);
#endif
}
return 0;
}
int fds_send_via(int sock, int *fds, int nr_fds)
{
struct scm_fdset fdset;
int i, min_fd, ret;
int *cmsg_data;
cmsg_data = scm_fdset_init(&fdset);
for (i = 0; i < nr_fds; i += min_fd) {
min_fd = min(CR_SCM_MAX_FD, nr_fds - i);
scm_fdset_init_chunk(&fdset, min_fd);
__std(memcpy(cmsg_data, &fds[i], sizeof(int) * min_fd));
ret = __sys(sendmsg(sock, &fdset.hdr, 0));
if (ret <= 0)
return ret ? : -1;
}
return 0;
}
int fds_recv_via(int sock, int *fds, int nr_fds)
{
struct scm_fdset fdset;
struct cmsghdr *cmsg;
int *cmsg_data;
int ret;
int i, min_fd;
cmsg_data = scm_fdset_init(&fdset);
for (i = 0; i < nr_fds; i += min_fd) {
min_fd = min(CR_SCM_MAX_FD, nr_fds - i);
scm_fdset_init_chunk(&fdset, min_fd);
ret = __sys(recvmsg(sock, &fdset.hdr, 0));
if (ret <= 0)
return ret ? : -1;
cmsg = CMSG_FIRSTHDR(&fdset.hdr);
if (!cmsg || cmsg->cmsg_type != SCM_RIGHTS)
return -1;
if (fdset.hdr.msg_flags & MSG_CTRUNC)
return -2;
min_fd = (cmsg->cmsg_len - sizeof(struct cmsghdr)) / sizeof(int);
/*
* In case if kernel screwed the recepient, most probably
* the caller stack frame will be overwriten, just scream
* and exit.
*/
if (unlikely(min_fd > CR_SCM_MAX_FD))
*(volatile unsigned long *)NULL = 0xdead0000 + __LINE__;
if (unlikely(min_fd <= 0))
return -1;
__std(memcpy(&fds[i], cmsg_data, sizeof(int) * min_fd));
}
return 0;
}
int send_fds(int sock, struct sockaddr_un *saddr, int len,
int *fds, int nr_fds, void *data, unsigned ch_size)
{
struct scm_fdset fdset;
int *cmsg_data;
int i, min_fd, ret;
cmsg_data = scm_fdset_init(&fdset, saddr, len);
for (i = 0; i < nr_fds; i += min_fd) {
min_fd = min(CR_SCM_MAX_FD, nr_fds - i);
scm_fdset_init_chunk(&fdset, min_fd, data, ch_size);
__memcpy(cmsg_data, &fds[i], sizeof(int) * min_fd);
ret = __sys(sendmsg)(sock, &fdset.hdr, 0);
if (ret <= 0)
return ret ? : -1;
if (data)
data += min_fd * ch_size;
}
return 0;
}
int send_fds(int sock, struct sockaddr_un *saddr, int len,
int *fds, int nr_fds, bool with_flags)
{
struct scm_fdset fdset;
int *cmsg_data;
int i, min_fd, ret;
cmsg_data = scm_fdset_init(&fdset, saddr, len, with_flags);
for (i = 0; i < nr_fds; i += min_fd) {
min_fd = min(CR_SCM_MAX_FD, nr_fds - i);
scm_fdset_init_chunk(&fdset, min_fd, with_flags);
__memcpy(cmsg_data, &fds[i], sizeof(int) * min_fd);
#ifdef SCM_FDSET_HAS_OPTS
if (with_flags) {
int j;
for (j = 0; j < min_fd; j++) {
int flags, fd = fds[i + j];
struct fd_opts *p = fdset.opts + j;
struct f_owner_ex owner_ex;
uint32_t v[2];
flags = __sys(fcntl)(fd, F_GETFD, 0);
if (flags < 0) {
pr_err("fcntl(%d, F_GETFD) -> %d\n", fd, flags);
return -1;
}
p->flags = (char)flags;
ret = __sys(fcntl)(fd, F_GETOWN_EX, (long)&owner_ex);
if (ret) {
pr_err("fcntl(%d, F_GETOWN_EX) -> %d\n", fd, ret);
return -1;
}
/*
* Simple case -- nothing is changed.
*/
if (owner_ex.pid == 0) {
p->fown.pid = 0;
continue;
}
ret = __sys(fcntl)(fd, F_GETOWNER_UIDS, (long)&v);
if (ret) {
pr_err("fcntl(%d, F_GETOWNER_UIDS) -> %d\n", fd, ret);
return -1;
}
p->fown.uid = v[0];
p->fown.euid = v[1];
p->fown.pid_type = owner_ex.type;
p->fown.pid = owner_ex.pid;
}
}
#endif
ret = __sys(sendmsg)(sock, &fdset.hdr, 0);
if (ret <= 0)
return ret ? : -1;
}
return 0;
}
