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Add idle option, so we can stop iodine and start it on demand with systemd

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This commit is contained in:
Michael Scherer 2013-12-23 21:58:28 +01:00
parent 717f1d5d26
commit abd276ed9e
2 changed files with 30 additions and 6 deletions
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6
man/iodine.8
View file

@ -71,6 +71,8 @@ iodine, iodined \- tunnel IPv4 over DNS
.I context
.B ] [-F
.I pidfile
.B ] [-i
.I max_idle_time
.B ]
.I tunnel_ip
.B [
@ -278,6 +280,10 @@ same as 'port'.
.B Note:
The forwarding is not fully transparent, and not advised for use
in production environments.
.TP
.B -i max_idle_time
Make the server stop itself after max_idle_time seconds if no traffic have been received.
This should be combined with systemd or upstart on demand activation for being effective.
.SS Client Arguments:
.TP
.B nameserver

30
src/iodined.c
View file

@ -1688,12 +1688,13 @@ tunnel_dns(int tun_fd, int dns_fd, int bind_fd)
}
static int
tunnel(int tun_fd, int dns_fd, int bind_fd)
tunnel(int tun_fd, int dns_fd, int bind_fd, int max_idle_time)
{
struct timeval tv;
fd_set fds;
int i;
int userid;
time_t last_action = time(NULL);
while (running) {
int maxfd;
@ -1744,8 +1745,20 @@ tunnel(int tun_fd, int dns_fd, int bind_fd)
return 1;
}
if (i==0) {
/* timeout; whatever; doesn't matter anymore */
if (i==0) {
if (max_idle_time) {
/* only trigger the check if that's worth ( ie, no need to loop over if there
is something to send */
if (last_action + max_idle_time < time(NULL)) {
for (userid = 0; userid < created_users; userid++) {
last_action = ( users[userid].last_pkt > last_action ) ? users[userid].last_pkt : last_action;
}
if (last_action + max_idle_time < time(NULL)) {
fprintf(stderr, "Idling since too long, shutting down...\n");
running = 0;
}
}
}
} else {
if (FD_ISSET(tun_fd, &fds)) {
tunnel_tun(tun_fd, dns_fd);
@ -2172,7 +2185,7 @@ usage() {
fprintf(stderr, "Usage: %s [-v] [-h] [-c] [-s] [-f] [-D] [-u user] "
"[-t chrootdir] [-d device] [-m mtu] [-z context] "
"[-l ip address to listen on] [-p port] [-n external ip] "
"[-b dnsport] [-P password] [-F pidfile] "
"[-b dnsport] [-P password] [-F pidfile] [-i max idle time] "
"tunnel_ip[/netmask] topdomain\n", __progname);
exit(2);
}
@ -2206,6 +2219,7 @@ help() {
fprintf(stderr, " -b port to forward normal DNS queries to (on localhost)\n");
fprintf(stderr, " -P password used for authentication (max 32 chars will be used)\n");
fprintf(stderr, " -F pidfile to write pid to a file\n");
fprintf(stderr, " -i maximum idle time before shutting down\n");
fprintf(stderr, "tunnel_ip is the IP number of the local tunnel interface.\n");
fprintf(stderr, " /netmask sets the size of the tunnel network.\n");
fprintf(stderr, "topdomain is the FQDN that is delegated to this server.\n");
@ -2250,6 +2264,7 @@ main(int argc, char **argv)
char *netsize;
int ns_get_externalip;
int retval;
int max_idle_time = 0;
#ifdef HAVE_SYSTEMD
int nb_fds;
#endif
@ -2299,7 +2314,7 @@ main(int argc, char **argv)
srand(time(NULL));
fw_query_init();
while ((choice = getopt(argc, argv, "vcsfhDu:t:d:m:l:p:n:b:P:z:F:")) != -1) {
while ((choice = getopt(argc, argv, "vcsfhDu:t:d:m:l:p:n:b:P:z:F:i:")) != -1) {
switch(choice) {
case 'v':
version();
@ -2351,6 +2366,9 @@ main(int argc, char **argv)
case 'F':
pidfile = optarg;
break;
case 'i':
max_idle_time = atoi(optarg);
break;
case 'P':
strncpy(password, optarg, sizeof(password));
password[sizeof(password)-1] = 0;
@ -2559,7 +2577,7 @@ main(int argc, char **argv)
syslog(LOG_INFO, "started, listening on port %d", port);
tunnel(tun_fd, dnsd_fd, bind_fd);
tunnel(tun_fd, dnsd_fd, bind_fd, max_idle_time);
syslog(LOG_INFO, "stopping");
cleanup3: