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#36, Send ping message every 20 seconds

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This commit is contained in:
Erik Ekman 2009-08-15 12:43:02 +00:00
parent 62c171db0d
commit 03243094e5
3 changed files with 61 additions and 23 deletions
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1
src/common.h
View File

@ -23,6 +23,7 @@
#define RAW_HDR_CMD 3
#define RAW_HDR_CMD_LOGIN 0x10
#define RAW_HDR_CMD_DATA 0x20
#define RAW_HDR_CMD_PING 0x30
#define RAW_HDR_CMD_MASK 0xF0
#define RAW_HDR_USR_MASK 0x0F

60
src/iodine.c
View File

@ -58,6 +58,8 @@ WORD req_version = MAKEWORD(2, 2);
WSADATA wsa_data;
#endif
#define PING_TIMEOUT(t) ((t) >= (conn == CONN_DNS_NULL ? 1 : 20))
static void send_ping(int fd);
static void send_chunk(int fd);
static void send_raw_data(int fd);
@ -132,7 +134,9 @@ send_raw(int fd, char *buf, int buflen, int user, int cmd)
len = MIN(sizeof(packet) - RAW_HDR_LEN, buflen);
memcpy(packet, raw_header, RAW_HDR_LEN);
memcpy(&packet[RAW_HDR_LEN], buf, len);
if (len) {
memcpy(&packet[RAW_HDR_LEN], buf, len);
}
len += RAW_HDR_LEN;
packet[RAW_HDR_CMD] = cmd | (user & 0x0F);
@ -345,8 +349,10 @@ tunnel(int tun_fd, int dns_fd)
fd_set fds;
int rv;
int i;
int seconds;
rv = 0;
seconds = 0;
while (running) {
tv.tv_sec = 1;
@ -367,10 +373,11 @@ tunnel(int tun_fd, int dns_fd)
if (i < 0)
err(1, "select");
if (i == 0 && conn == CONN_DNS_NULL) /* timeout */
send_ping(dns_fd);
else {
if (i == 0) { /* timeout */
seconds++;
} else {
if (FD_ISSET(tun_fd, &fds)) {
seconds = 0;
if (tunnel_tun(tun_fd, dns_fd) <= 0)
continue;
}
@ -379,6 +386,11 @@ tunnel(int tun_fd, int dns_fd)
continue;
}
}
if (PING_TIMEOUT(seconds)) {
send_ping(dns_fd);
seconds = 0;
}
}
return rv;
@ -445,25 +457,29 @@ send_login(int fd, char *login, int len)
static void
send_ping(int fd)
{
char data[4];
if (is_sending()) {
outpkt.sentlen = 0;
outpkt.offset = 0;
outpkt.len = 0;
if (conn == CONN_DNS_NULL) {
char data[4];
if (is_sending()) {
outpkt.sentlen = 0;
outpkt.offset = 0;
outpkt.len = 0;
}
data[0] = userid;
data[1] = ((downstream_seqno & 7) << 4) | (downstream_fragment & 15);
data[2] = (rand_seed >> 8) & 0xff;
data[3] = (rand_seed >> 0) & 0xff;
down_ack_seqno = downstream_seqno;
down_ack_fragment = downstream_fragment;
rand_seed++;
send_packet(fd, 'P', data, sizeof(data));
} else {
send_raw(fd, NULL, 0, userid, RAW_HDR_CMD_PING);
}
data[0] = userid;
data[1] = ((downstream_seqno & 7) << 4) | (downstream_fragment & 15);
data[2] = (rand_seed >> 8) & 0xff;
data[3] = (rand_seed >> 0) & 0xff;
down_ack_seqno = downstream_seqno;
down_ack_fragment = downstream_fragment;
rand_seed++;
send_packet(fd, 'P', data, sizeof(data));
}
static void

23
src/iodined.c
View File

@ -145,7 +145,9 @@ send_raw(int fd, char *buf, int buflen, int user, int cmd, struct query *q)
len = MIN(sizeof(packet) - RAW_HDR_LEN, buflen);
memcpy(packet, raw_header, RAW_HDR_LEN);
memcpy(&packet[RAW_HDR_LEN], buf, len);
if (len) {
memcpy(&packet[RAW_HDR_LEN], buf, len);
}
len += RAW_HDR_LEN;
packet[RAW_HDR_CMD] = cmd | (user & 0x0F);
@ -929,6 +931,21 @@ handle_raw_data(char *packet, int len, struct query *q, int dns_fd, int tun_fd,
handle_full_packet(tun_fd, userid);
}
static void
handle_raw_ping(struct query *q, int dns_fd, int userid)
{
if (check_user_and_ip(userid, q) != 0) {
return;
}
/* Update query and time info for user */
users[userid].last_pkt = time(NULL);
memcpy(&(users[userid].q), q, sizeof(struct query));
/* Send ping reply */
send_raw(dns_fd, NULL, 0, userid, RAW_HDR_CMD_PING, q);
}
static int
raw_decode(char *packet, int len, struct query *q, int dns_fd, int tun_fd)
{
@ -949,6 +966,10 @@ raw_decode(char *packet, int len, struct query *q, int dns_fd, int tun_fd)
/* Data packet */
handle_raw_data(&packet[RAW_HDR_LEN], len - RAW_HDR_LEN, q, dns_fd, tun_fd, raw_user);
break;
case RAW_HDR_CMD_PING:
/* Keepalive packet */
handle_raw_ping(q, dns_fd, raw_user);
break;
default:
warnx("Unhandled raw command %02X from user %d", RAW_HDR_GET_CMD(packet), raw_user);
break;