mirror of
https://github.com/xemu-project/xemu.git
synced 2024-11-24 20:19:44 +00:00
d35172b425
This gives us more freedom about the fd that is passed to qemu, allowing us to e.g. pass sockets. Reviewed-by: Kevin Wolf <kwolf@redhat.com> Signed-off-by: Max Reitz <mreitz@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
137 lines
3.1 KiB
C
137 lines
3.1 KiB
C
/*
|
|
* SCM_RIGHTS with unix socket help program for test
|
|
*
|
|
* Copyright IBM, Inc. 2013
|
|
*
|
|
* Authors:
|
|
* Wenchao Xia <xiawenc@linux.vnet.ibm.com>
|
|
*
|
|
* This work is licensed under the terms of the GNU LGPL, version 2 or later.
|
|
* See the COPYING.LIB file in the top-level directory.
|
|
*/
|
|
|
|
#include "qemu/osdep.h"
|
|
#include <sys/socket.h>
|
|
#include <sys/un.h>
|
|
|
|
/* #define SOCKET_SCM_DEBUG */
|
|
|
|
/*
|
|
* @fd and @fd_to_send will not be checked for validation in this function,
|
|
* a blank will be sent as iov data to notify qemu.
|
|
*/
|
|
static int send_fd(int fd, int fd_to_send)
|
|
{
|
|
struct msghdr msg;
|
|
struct iovec iov[1];
|
|
int ret;
|
|
char control[CMSG_SPACE(sizeof(int))];
|
|
struct cmsghdr *cmsg;
|
|
|
|
memset(&msg, 0, sizeof(msg));
|
|
memset(control, 0, sizeof(control));
|
|
|
|
/* Send a blank to notify qemu */
|
|
iov[0].iov_base = (void *)" ";
|
|
iov[0].iov_len = 1;
|
|
|
|
msg.msg_iov = iov;
|
|
msg.msg_iovlen = 1;
|
|
|
|
msg.msg_control = control;
|
|
msg.msg_controllen = sizeof(control);
|
|
|
|
cmsg = CMSG_FIRSTHDR(&msg);
|
|
|
|
cmsg->cmsg_len = CMSG_LEN(sizeof(int));
|
|
cmsg->cmsg_level = SOL_SOCKET;
|
|
cmsg->cmsg_type = SCM_RIGHTS;
|
|
memcpy(CMSG_DATA(cmsg), &fd_to_send, sizeof(int));
|
|
|
|
do {
|
|
ret = sendmsg(fd, &msg, 0);
|
|
} while (ret < 0 && errno == EINTR);
|
|
|
|
if (ret < 0) {
|
|
fprintf(stderr, "Failed to send msg, reason: %s\n", strerror(errno));
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/* Convert string to fd number. */
|
|
static int get_fd_num(const char *fd_str, bool silent)
|
|
{
|
|
int sock;
|
|
char *err;
|
|
|
|
errno = 0;
|
|
sock = strtol(fd_str, &err, 10);
|
|
if (errno) {
|
|
if (!silent) {
|
|
fprintf(stderr, "Failed in strtol for socket fd, reason: %s\n",
|
|
strerror(errno));
|
|
}
|
|
return -1;
|
|
}
|
|
if (!*fd_str || *err || sock < 0) {
|
|
if (!silent) {
|
|
fprintf(stderr, "bad numerical value for socket fd '%s'\n", fd_str);
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
return sock;
|
|
}
|
|
|
|
/*
|
|
* To make things simple, the caller needs to specify:
|
|
* 1. socket fd.
|
|
* 2. path of the file to be sent.
|
|
*/
|
|
int main(int argc, char **argv, char **envp)
|
|
{
|
|
int sock, fd, ret;
|
|
|
|
#ifdef SOCKET_SCM_DEBUG
|
|
int i;
|
|
for (i = 0; i < argc; i++) {
|
|
fprintf(stderr, "Parameter %d: %s\n", i, argv[i]);
|
|
}
|
|
#endif
|
|
|
|
if (argc != 3) {
|
|
fprintf(stderr,
|
|
"Usage: %s < socket-fd > < file-path >\n",
|
|
argv[0]);
|
|
return EXIT_FAILURE;
|
|
}
|
|
|
|
|
|
sock = get_fd_num(argv[1], false);
|
|
if (sock < 0) {
|
|
return EXIT_FAILURE;
|
|
}
|
|
|
|
fd = get_fd_num(argv[2], true);
|
|
if (fd < 0) {
|
|
/* Now only open a file in readonly mode for test purpose. If more
|
|
precise control is needed, use python script in file operation, which
|
|
is supposed to fork and exec this program. */
|
|
fd = open(argv[2], O_RDONLY);
|
|
if (fd < 0) {
|
|
fprintf(stderr, "Failed to open file '%s'\n", argv[2]);
|
|
return EXIT_FAILURE;
|
|
}
|
|
}
|
|
|
|
ret = send_fd(sock, fd);
|
|
if (ret < 0) {
|
|
close(fd);
|
|
return EXIT_FAILURE;
|
|
}
|
|
|
|
close(fd);
|
|
return EXIT_SUCCESS;
|
|
}
|