static
int recv_fd_from_master(struct run_as_worker *worker, enum run_as_cmd cmd, int *fd)
{
int ret = 0;
switch (cmd) {
case RUN_AS_EXTRACT_ELF_SYMBOL_OFFSET:
case RUN_AS_EXTRACT_SDT_PROBE_OFFSETS:
case RUN_AS_MKDIRAT:
case RUN_AS_MKDIRAT_RECURSIVE:
break;
case RUN_AS_MKDIR:
case RUN_AS_MKDIR_RECURSIVE:
*fd = AT_FDCWD;
/* fall-through */
default:
return 0;
}
ret = do_recv_fd(worker->sockpair[1], fd);
if (ret < 0) {
PERROR("do_recv_fd error");
ret = -1;
}
return ret;
}
static
int run_as_cmd(struct run_as_worker *worker,
enum run_as_cmd cmd,
struct run_as_data *data,
uid_t uid, gid_t gid)
{
ssize_t readlen, writelen;
struct run_as_ret recvret;
/*
* If we are non-root, we can only deal with our own uid.
*/
if (geteuid() != 0) {
if (uid != geteuid()) {
recvret.ret = -1;
recvret._errno = EPERM;
ERR("Client (%d)/Server (%d) UID mismatch (and sessiond is not root)",
(int) uid, (int) geteuid());
goto end;
}
}
data->cmd = cmd;
data->uid = uid;
data->gid = gid;
writelen = lttcomm_send_unix_sock(worker->sockpair[0], data,
sizeof(*data));
if (writelen < sizeof(*data)) {
PERROR("Error writing message to run_as");
recvret.ret = -1;
recvret._errno = errno;
goto end;
}
/* receive return value */
readlen = lttcomm_recv_unix_sock(worker->sockpair[0], &recvret,
sizeof(recvret));
if (!readlen) {
ERR("Run-as worker has hung-up during run_as_cmd");
recvret.ret = -1;
recvret._errno = EIO;
goto end;
} else if (readlen < sizeof(recvret)) {
PERROR("Error reading response from run_as");
recvret.ret = -1;
recvret._errno = errno;
}
if (do_recv_fd(worker, cmd, &recvret.ret)) {
recvret.ret = -1;
recvret._errno = EIO;
}
end:
errno = recvret._errno;
return recvret.ret;
}
static
int recv_fd_from_worker(struct run_as_worker *worker, enum run_as_cmd cmd, int *fd)
{
int ret = 0;
switch (cmd) {
case RUN_AS_OPEN:
break;
default:
return 0;
}
ret = do_recv_fd(worker->sockpair[0], fd);
if (ret < 0) {
PERROR("do_recv_fd error");
ret = -1;
}
return ret;
}
