In some bad cases, for example, host OS crashes without
sending any FIN to usbredirserver, and usbredirserver
will keep idle connection for a long time.
We can also set the kernel arguments, it means that other
processes may be affected.
Setting a sensible timeout(like 10 minutes) seems good.
But QEMU is restarted after host OS crashes, it usually
needs to reconnect usbredirserver within 2 minutes.
So, add cmdline argument '-k' and "--keepalive" for
usbredirserver to set tcp keepalive idle time(30s),
interval time(10s), and maximum number of keepalive probes
count(3). Detecting disconnection costs time is :
30s + 10s * 3 = 60s
If setting TCP keepalive fails with errno ENOTSUP, ignore
the specific error.
Signed-off-by: zhenwei.pi <zhenwei...@youruncloud.com>
---
usbredirserver/usbredirserver.c | 41 ++++++++++++++++++++++++++++++++++++++++-
1 file changed, 40 insertions(+), 1 deletion(-)
diff --git a/usbredirserver/usbredirserver.c b/usbredirserver/usbredirserver.c
index 5575181..246171c 100644
--- a/usbredirserver/usbredirserver.c
+++ b/usbredirserver/usbredirserver.c
@@ -37,6 +37,7 @@
#include <netdb.h>
#include <netinet/in.h>
#include <arpa/inet.h>
+#include <netinet/tcp.h>
#include "usbredirhost.h"
@@ -52,6 +53,7 @@ static const struct option longopts[] = {
{ "verbose", required_argument, NULL, 'v' },
{ "ipv4", required_argument, NULL, '4' },
{ "ipv6", required_argument, NULL, '6' },
+ { "keepalive", no_argument, NULL, 'k' },
{ "help", no_argument, NULL, 'h' },
{ NULL, 0, NULL, 0 }
};
@@ -98,6 +100,7 @@ static void usage(int exit_code, char *argv0)
fprintf(exit_code? stderr:stdout,
"Usage: %s [-p|--port <port>] [-v|--verbose <0-5>] "
"[[-4|--ipv4 ipaddr]|[-6|--ipv6 ipaddr]] "
+ "[-k|--keepalive] "
"<busnum-devnum|vendorid:prodid>\n",
argv0);
exit(exit_code);
@@ -203,6 +206,7 @@ int main(int argc, char *argv[])
int usbvendor = -1;
int usbproduct = -1;
int on = 1;
+ int keepalive = 0;
char *ipv4_addr = NULL, *ipv6_addr = NULL;
union {
struct sockaddr_in v4;
@@ -211,7 +215,7 @@ int main(int argc, char *argv[])
struct sigaction act;
libusb_device_handle *handle = NULL;
- while ((o = getopt_long(argc, argv, "hp:v:4:6:", longopts, NULL)) != -1) {
+ while ((o = getopt_long(argc, argv, "hp:v:4:6:k", longopts, NULL)) != -1) {
switch (o) {
case 'p':
port = strtol(optarg, &endptr, 10);
@@ -233,6 +237,9 @@ int main(int argc, char *argv[])
case '6':
ipv6_addr = optarg;
break;
+ case 'k':
+ keepalive = 1;
+ break;
case '?':
case 'h':
usage(o == '?', argv[0]);
@@ -348,6 +355,38 @@ int main(int argc, char *argv[])
break;
}
+ if (keepalive) {
+ int optval = 1;
+ socklen_t optlen = sizeof(optval);
+ if (setsockopt(client_fd, SOL_SOCKET, SO_KEEPALIVE, &optval,
optlen) == -1) {
+ if (errno != ENOTSUP) {
+ perror("setsockopt SO_KEEPALIVE error.");
+ break;
+ }
+ }
+ optval = 30; /* set default TCP_KEEPIDLE time as 30s */
+ if (setsockopt(client_fd, SOL_TCP, TCP_KEEPIDLE, &optval, optlen)
== -1) {
+ if (errno != ENOTSUP) {
+ perror("setsockopt TCP_KEEPIDLE error.");
+ break;
+ }
+ }
+ optval = 10; /* set default TCP_KEEPINTVL time as 10s */
+ if (setsockopt(client_fd, SOL_TCP, TCP_KEEPINTVL, &optval, optlen)
== -1) {
+ if (errno != ENOTSUP) {
+ perror("setsockopt TCP_KEEPINTVL error.");
+ break;
+ }
+ }
+ optval = 3; /* set default TCP_KEEPCNT as 3 */
+ if (setsockopt(client_fd, SOL_TCP, TCP_KEEPCNT, &optval, optlen)
== -1) {
+ if (errno != ENOTSUP) {
+ perror("setsockopt TCP_KEEPCNT error.");
+ break;
+ }
+ }
+ }
+
flags = fcntl(client_fd, F_GETFL);
if (flags == -1) {
perror("fcntl F_GETFL");
--
2.7.4
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