1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
|
/* port-helper
Used by the port and xterm console channels for User Mode Linux.
Tells UML "here is a file descriptor for my stdin as given to me by
xterm or telnetd". Once UML has that (with os_rcv_fd()) UML opens it
for read and write, and the console is functional.
(c) Jeff Dike 2002-2004
*/
#include <stdio.h>
#include <stdlib.h>
#include <signal.h>
#include <errno.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <sys/uio.h>
extern void send_fd(int fd, int target, struct sockaddr *to, int to_len,
void *msg, int msg_len);
/* for xterm we don't have an open socket, we only have the name
of a file used as a Unix socket by UML. So we need to open it. */
static int open_socket(char *name)
{
struct sockaddr_un sock;
int fd;
if((fd = socket(AF_UNIX, SOCK_DGRAM, 0)) < 0){
perror("socket");
exit(1);
}
sock.sun_family = AF_UNIX;
memset(sock.sun_path, 0, sizeof(sock.sun_path));
sprintf(&sock.sun_path[1], "%5d", getpid());
if(bind(fd, (struct sockaddr *) &sock, sizeof(sock)) < 0){
perror("bind");
exit(1);
}
snprintf(sock.sun_path, sizeof(sock.sun_path), "%s", name);
if(connect(fd, (struct sockaddr *) &sock, sizeof(sock))){
perror("connect");
exit(1);
}
return(fd);
}
int main(int argc, char **argv)
{
int fd, pid;
if((argc > 1) && !strcmp(argv[1], "-uml-socket")) {
/* inherited a filename not an open fd */
fd = open_socket(argv[2]);
} else {
/* inherited fd of the listening TCP socket */
fd = 3;
}
signal(SIGHUP, SIG_IGN);
if(ioctl(0, TIOCNOTTY, 0) < 0)
perror("TIOCNOTTY failed in port-helper, check UML's exec call for xterm or telnetd");
pid = getpid();
send_fd(0, fd, NULL, 0, &pid, sizeof(pid));
pause();
return(0);
}
|
