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Improved latency for traffic initiated from server

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This commit is contained in:
Erik Ekman 2008-08-07 13:22:30 +00:00 committed by Erik Ekman
parent 5776562339
commit 3fc9eaeaa3
5 changed files with 34 additions and 67 deletions
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6
CHANGELOG
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@ -5,6 +5,12 @@ iodine - http://code.kryo.se/iodine
CHANGES:
2008-xx-xx: 0.x.x
- Delayed sending responses in server to improve latency. Pings from
server to client are now always fast instead of cycling from
fast to 1000 ms.
- The server now replies to all received queries.
2008-08-06: 0.4.2 "Opened Zone"
- Applied a few small patches from Maxim Bourmistrov and Gregor Herrmann
- Applied a patch for not creating and configuring the tun interface,

53
src/iodined.c
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@ -107,6 +107,13 @@ tunnel_tun(int tun_fd, int dns_fd)
if (users[userid].outpacket.len == 0) {
memcpy(users[userid].outpacket.data, out, outlen);
users[userid].outpacket.len = outlen;
if (users[userid].q.id != 0) {
/* If delayed response is kept, send reply immediately */
write_dns(dns_fd, &(users[userid].q), users[userid].outpacket.data, users[userid].outpacket.len);
users[userid].outpacket.len = 0;
users[userid].q.id = 0;
return 0;
}
return outlen;
} else {
return 0;
@ -252,6 +259,12 @@ handle_null_request(int tun_fd, int dns_fd, struct query *q)
write_dns(dns_fd, q, "BADIP", 5);
return; /* illegal id */
}
if (users[userid].q.id != 0) {
/* If delayed response is kept, send empty reply before overwriting */
write_dns(dns_fd, &(users[userid].q), users[userid].outpacket.data, users[userid].outpacket.len);
users[userid].outpacket.len = 0;
users[userid].q.id = 0;
}
memcpy(&(users[userid].q), q, sizeof(struct query));
users[userid].last_pkt = time(NULL);
} else if(in[0] == 'Z' || in[0] == 'z') {
@ -285,6 +298,12 @@ handle_null_request(int tun_fd, int dns_fd, struct query *q)
users[userid].encoder);
users[userid].last_pkt = time(NULL);
if (users[userid].q.id != 0) {
/* If delayed response is kept, send empty reply before overwriting */
write_dns(dns_fd, &(users[userid].q), users[userid].outpacket.data, users[userid].outpacket.len);
users[userid].outpacket.len = 0;
users[userid].q.id = 0;
}
memcpy(&(users[userid].q), q, sizeof(struct query));
memcpy(users[userid].inpacket.data + users[userid].inpacket.offset, unpacked, read);
users[userid].inpacket.len += read;
@ -353,16 +372,10 @@ tunnel(int tun_fd, int dns_fd)
struct timeval tv;
fd_set fds;
int i;
int j;
while (running) {
if (users_waiting_on_reply()) {
tv.tv_sec = 0;
tv.tv_usec = 5000;
} else {
tv.tv_sec = 1;
tv.tv_usec = 0;
}
tv.tv_sec = 1;
tv.tv_usec = 0;
FD_ZERO(&fds);
/* TODO : use some kind of packet queue */
@ -379,24 +392,14 @@ tunnel(int tun_fd, int dns_fd)
return 1;
}
if (i==0) {
for (j = 0; j < USERS; j++) {
if (users[j].q.id != 0) {
write_dns(dns_fd, &(users[j].q), users[j].outpacket.data, users[j].outpacket.len);
users[j].outpacket.len = 0;
users[j].q.id = 0;
}
}
} else {
if(FD_ISSET(tun_fd, &fds)) {
tunnel_tun(tun_fd, dns_fd);
continue;
}
if(FD_ISSET(dns_fd, &fds)) {
tunnel_dns(tun_fd, dns_fd);
continue;
}
if(FD_ISSET(tun_fd, &fds)) {
tunnel_tun(tun_fd, dns_fd);
continue;
}
if(FD_ISSET(dns_fd, &fds)) {
tunnel_dns(tun_fd, dns_fd);
continue;
}
}
return 0;

17
src/user.c
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@ -53,23 +53,6 @@ init_users(in_addr_t my_ip)
}
}
int
users_waiting_on_reply()
{
int ret;
int i;
ret = 0;
for (i = 0; i < USERS; i++) {
if (users[i].active && users[i].last_pkt + 60 > time(NULL) &&
users[i].q.id != 0) {
ret++;
}
}
return ret;
}
int
find_user_by_ip(uint32_t ip)
{

1
src/user.h
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@ -35,7 +35,6 @@ struct user {
extern struct user users[USERS];
void init_users(in_addr_t);
int users_waiting_on_reply();
int find_user_by_ip(uint32_t);
int all_users_waiting_to_send();
int find_available_user();

24
tests/user.c
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@ -46,29 +46,6 @@ START_TEST(test_init_users)
}
END_TEST
START_TEST(test_users_waiting)
{
in_addr_t ip;
ip = inet_addr("127.0.0.1");
init_users(ip);
fail_unless(users_waiting_on_reply() == 0);
users[3].active = 1;
fail_unless(users_waiting_on_reply() == 0);
users[3].last_pkt = time(NULL);
fail_unless(users_waiting_on_reply() == 0);
users[3].q.id = 1;
fail_unless(users_waiting_on_reply() == 1);
}
END_TEST
START_TEST(test_find_user_by_ip)
{
in_addr_t ip;
@ -153,7 +130,6 @@ test_user_create_tests()
tc = tcase_create("User");
tcase_add_test(tc, test_init_users);
tcase_add_test(tc, test_users_waiting);
tcase_add_test(tc, test_find_user_by_ip);
tcase_add_test(tc, test_all_users_waiting_to_send);
tcase_add_test(tc, test_find_available_user);