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tap-vsockd: open the tap device, connect the hvsock and negotiate

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Signed-off-by: David Scott <dave@recoil.org>
This commit is contained in:
David Scott 2016-05-12 16:25:05 +01:00
parent 3533ff526e
commit 853d17e04f
1 changed files with 54 additions and 9 deletions
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63
alpine/packages/tap-vsockd/tap-vsockd.c
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@ -24,6 +24,7 @@
#include "compat.h"
#include "protocol.h"
int verbose_flag = 0;
@ -101,10 +102,43 @@ struct client_args {
int tosend;
};
/* Handle a connection. Echo back anything sent to us and when the
* connection is closed send a bye message.
void negotiate(SOCKET fd, struct vif_info *vif)
{
/* Negotiate with com.docker.slirp */
struct init_message *me = create_init_message();
if (write_init_message(fd, me) == -1) {
goto err;
}
struct init_message you;
if (read_init_message(fd, &you) == -1) {
goto err;
}
char *txt = print_init_message(&you);
fprintf(stderr, "Server reports %s\n", txt);
free(txt);
enum command command = ethernet;
if (write_command(fd, &command) == -1) {
goto err;
}
struct ethernet_args args;
/* We don't need a uuid */
memset(&args.uuid_string[0], 0, sizeof(args.uuid_string));
if (write_ethernet_args(fd, &args) == -1) {
goto err;
}
if (read_vif_info(fd, vif) == -1) {
goto err;
}
return;
err:
fprintf(stderr, "Failed to negotiate with com.docker.slirp\n");
exit(1);
}
/* Handle a connection. Handshake with the com.docker.slirp process and start
* exchanging ethernet frames between the socket and the tap device.
*/
static void handle(SOCKET fd)
static void handle(SOCKET fd, int tapfd)
{
char recvbuf[SVR_BUF_LEN];
int recvbuflen = SVR_BUF_LEN;
@ -112,6 +146,9 @@ static void handle(SOCKET fd)
int sent;
int res;
struct vif_info vif;
negotiate(fd, &vif);
for (;;) {
received = recv(fd, recvbuf, recvbuflen, 0);
if (received == 0) {
@ -145,7 +182,7 @@ static void handle(SOCKET fd)
/* Server:
* accept() in an endless loop, handle a connection at a time
*/
static int server(GUID serviceid)
static int server(GUID serviceid, int tapfd)
{
SOCKET lsock = INVALID_SOCKET;
SOCKET csock = INVALID_SOCKET;
@ -189,7 +226,7 @@ static int server(GUID serviceid)
printf("Connect from: "GUID_FMT":"GUID_FMT"\n",
GUID_ARGS(sac.VmId), GUID_ARGS(sac.ServiceId));
handle(csock);
handle(csock, tapfd);
closesocket(csock);
}
}
@ -204,7 +241,7 @@ void usage(char *name)
int __cdecl main(int argc, char **argv)
{
int res = 0;
GUID target = HV_GUID_PARENT;
GUID sid;
int c;
char *serviceid = NULL;
char *tap = "tap0";
@ -243,7 +280,15 @@ int __cdecl main(int argc, char **argv)
fprintf(stderr, "serviceid=%s\n", serviceid);
/* 3049197C-9A4E-4FBF-9367-97F792F16994 */
fprintf(stderr, "tap=%s\n", tap);
server(target);
return res;
res = parseguid(serviceid, &sid);
if (res) {
fprintf(stderr, "Failed to parse serviceid as GUID: %s\n", serviceid);
usage(argv[0]);
exit(1);
}
int tapfd = alloc_tap(tap);
server(sid, tapfd);
return 0;
}