nihilist/tor
1
0
Fork 0
mirror of https://gitlab.torproject.org/tpo/core/tor.git synced 2024-09-20 13:06:20 +02:00
Code Issues Packages Projects Releases Wiki Activity

introduced a periodic keepalive padding cell

Browse Source 
now tor can be run safely inside nat'ed areas that kill idle
connections; and the proxy can handle when you suspend your laptop
and then emerge hours later from a new domain.


svn:r125
This commit is contained in:
Roger Dingledine 2002-10-01 23:37:31 +00:00
parent 293e049a89
commit 7ed6c8bd39
4 changed files with 94 additions and 19 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
src/or/config.c
View File

@ -99,6 +99,8 @@ RETURN VALUE: 0 on success, non-zero on error
0, "how many seconds between directory rebuilds", "<rebuildperiod>" },
{ "DirFetchPeriod", 'F', POPT_ARG_INT, &options->DirFetchPeriod,
0, "how many seconds between directory fetches", "<fetchperiod>" },
{ "KeepalivePeriod", 'K', POPT_ARG_INT, &options->KeepalivePeriod,
0, "how many seconds between keepalives", "<keepaliveperiod>" },
// { "ReconnectPeriod", 'e', POPT_ARG_INT, &options->ReconnectPeriod,
// 0, "how many seconds between retrying all OR connections", "<reconnectperiod>" },
{ "Role", 'R', POPT_ARG_INT, &options->Role,
@ -122,6 +124,7 @@ RETURN VALUE: 0 on success, non-zero on error
options->LinkPadding = 0;
options->DirRebuildPeriod = 600;
options->DirFetchPeriod = 6000;
options->KeepalivePeriod = 300;
// options->ReconnectPeriod = 6001;
options->Role = ROLE_OR_LISTEN | ROLE_OR_CONNECT_ALL | ROLE_OP_LISTEN | ROLE_AP_LISTEN;
@ -170,9 +173,10 @@ RETURN VALUE: 0 on success, non-zero on error
options->MaxConn,
options->TrafficShaping,
options->LinkPadding);
printf("DirRebuildPeriod=%d, DirFetchPeriod=%d\n",
printf("DirRebuildPeriod=%d, DirFetchPeriod=%d KeepalivePeriod=%d\n",
options->DirRebuildPeriod,
options->DirFetchPeriod);
options->DirFetchPeriod,
options->KeepalivePeriod);
}
/* Validate options */
@ -287,6 +291,12 @@ RETURN VALUE: 0 on success, non-zero on error
code = -1;
}
if ( options->KeepalivePeriod < 1)
{
log(LOG_ERR,"KeepalivePeriod option must be positive.");
code = -1;
}
return code;
}

18
src/or/connection.c
View File

@ -86,6 +86,10 @@ void tv_addms(struct timeval *a, long ms) {
connection_t *connection_new(int type) {
connection_t *conn;
struct timeval now;
if(gettimeofday(&now,NULL) < 0)
return NULL;
conn = (connection_t *)malloc(sizeof(connection_t));
if(!conn)
@ -99,6 +103,7 @@ connection_t *connection_new(int type) {
conn->receiver_bucket = 10240; /* should be enough to do the handshake */
conn->bandwidth = conn->receiver_bucket / 10; /* give it a default */
conn->timestamp_created = now.tv_sec;
if (connection_speaks_cells(conn)) {
conn->f_crypto = crypto_new_cipher_env(CRYPTO_CIPHER_DES);
@ -320,6 +325,7 @@ connection_t *connection_connect_to_router_as_op(routerinfo_t *router, uint16_t
int connection_read_to_buf(connection_t *conn) {
int read_result;
struct timeval now;
if(connection_speaks_cells(conn)) {
assert(conn->receiver_bucket >= 0);
@ -327,6 +333,11 @@ int connection_read_to_buf(connection_t *conn) {
if(!connection_speaks_cells(conn)) {
assert(conn->receiver_bucket < 0);
}
if(gettimeofday(&now,NULL) < 0)
return -1;
conn->timestamp_lastread = now.tv_sec;
read_result = read_to_buf(conn->s, conn->receiver_bucket, &conn->inbuf, &conn->inbuflen,
&conn->inbuf_datalen, &conn->inbuf_reached_eof);
// log(LOG_DEBUG,"connection_read_to_buf(): read_to_buf returned %d.",read_result);
@ -369,9 +380,16 @@ int connection_flush_buf(connection_t *conn) {
}
int connection_write_to_buf(char *string, int len, connection_t *conn) {
struct timeval now;
if(gettimeofday(&now,NULL) < 0)
return -1;
if(!len)
return 0;
conn->timestamp_lastwritten = now.tv_sec;
if( (!connection_speaks_cells(conn)) ||
(!connection_state_is_open(conn)) ||
(options.LinkPadding == 0) ) {

76
src/or/main.c
View File

@ -310,20 +310,11 @@ int prepare_for_poll(int *timeout) {
connection_t *conn = NULL;
connection_t *tmpconn;
struct timeval now, soonest;
static int current_second = 0; /* from previous calls to gettimeofday */
static int time_to_rebuild_directory = 0;
static int time_to_fetch_directory = 0;
static long current_second = 0; /* from previous calls to gettimeofday */
static long time_to_rebuild_directory = 0;
static long time_to_fetch_directory = 0;
int ms_until_conn;
*timeout = -1; /* set it to never timeout, possibly overridden below */
/* first check if we need to refill buckets */
for(i=0;i<nfds;i++) {
if(connection_receiver_bucket_should_increase(connection_array[i])) {
need_to_refill_buckets = 1;
break;
}
}
cell_t cell;
if(gettimeofday(&now,NULL) < 0)
return -1;
@ -356,6 +347,50 @@ int prepare_for_poll(int *timeout) {
*timeout = 1000*(time_to_fetch_directory - now.tv_sec) + (1000 - (now.tv_usec / 1000));
}
/* check connections to see whether we should send a keepalive, expire, or wait */
for(i=0;i<nfds;i++) {
tmpconn = connection_array[i];
if(!connection_speaks_cells(tmpconn))
continue; /* this conn type doesn't send cells */
if(!connection_state_is_open(tmpconn)) {
continue; /* only conns in state 'open' need a keepalive */
/* XXX should time-out unfinished connections someday too */
}
if(now.tv_sec >= tmpconn->timestamp_lastwritten + options.KeepalivePeriod) {
if(!(options.Role & ROLE_OR_CONNECT_ALL) && !circuit_get_by_conn(tmpconn)) {
/* we're an onion proxy, with no circuits. kill it. */
log(LOG_DEBUG,"prepare_for_poll(): Expiring connection to %d (%s:%d).",
i,tmpconn->address, tmpconn->port);
tmpconn->marked_for_close = 1;
} else {
/* either a full router, or we've got a circuit. send a padding cell. */
// log(LOG_DEBUG,"prepare_for_poll(): Sending keepalive to (%s:%d)",
// tmpconn->address, tmpconn->port);
memset(&cell,0,sizeof(cell_t));
cell.command = CELL_PADDING;
connection_write_cell_to_buf(&cell, tmpconn);
}
}
if(!tmpconn->marked_for_close &&
*timeout > 1000*(tmpconn->timestamp_lastwritten + options.KeepalivePeriod - now.tv_sec)) {
*timeout = 1000*(tmpconn->timestamp_lastwritten + options.KeepalivePeriod - now.tv_sec);
}
}
assert(*timeout >= 0);
/* blow away any connections that need to die. can't do this later
* because we might open up a circuit and not realize it.
*/
for(i=0;i<nfds;i++)
check_conn_marked(i);
/* check if we need to refill buckets */
for(i=0;i<nfds;i++) {
if(connection_receiver_bucket_should_increase(connection_array[i])) {
need_to_refill_buckets = 1;
break;
}
}
if(need_to_refill_buckets) {
if(now.tv_sec > current_second) { /* the second has already rolled over! */
// log(LOG_DEBUG,"prepare_for_poll(): The second has rolled over, immediately refilling.");
@ -363,7 +398,7 @@ int prepare_for_poll(int *timeout) {
connection_increment_receiver_bucket(connection_array[i]);
current_second = now.tv_sec; /* remember which second it is, for next time */
}
/* this timeout is definitely sooner than either of the above two */
/* this timeout is definitely sooner than any of the above ones */
*timeout = 1000 - (now.tv_usec / 1000); /* how many milliseconds til the next second? */
}
@ -394,7 +429,7 @@ int prepare_for_poll(int *timeout) {
ms_until_conn = (soonest.tv_sec - now.tv_sec)*1000 +
(soonest.tv_usec - now.tv_usec)/1000;
// log(LOG_DEBUG,"prepare_for_poll(): conn %d times out in %d ms.",conn->s, ms_until_conn);
if(*timeout == -1 || ms_until_conn < *timeout) { /* use the new one */
if(ms_until_conn < *timeout) { /* use the new one */
// log(LOG_DEBUG,"prepare_for_poll(): conn %d soonest, in %d ms.",conn->s,ms_until_conn);
*timeout = ms_until_conn;
}
@ -517,18 +552,25 @@ static void catch(int the_signal) {
void dumpstats (void) { /* dump stats to stdout */
int i;
connection_t *conn;
struct timeval now;
extern char *conn_type_to_string[];
extern char *conn_state_to_string[][15];
printf("Dumping stats:\n");
if(gettimeofday(&now,NULL) < 0)
return ;
for(i=0;i<nfds;i++) {
conn = connection_array[i];
printf("Conn %d (socket %d) type %d (%s), state %d (%s)\n",
printf("Conn %d (socket %d) type %d (%s), state %d (%s), created %ld secs ago\n",
i, conn->s, conn->type, conn_type_to_string[conn->type],
conn->state, conn_state_to_string[conn->type][conn->state]);
conn->state, conn_state_to_string[conn->type][conn->state], now.tv_sec - conn->timestamp_created);
if(!connection_is_listener(conn)) {
printf("Conn %d is to '%s:%d'.\n",i,conn->address, conn->port);
printf("Conn %d: %d bytes waiting on inbuf (last read %ld secs ago)\n",i,conn->inbuf_datalen,
now.tv_sec - conn->timestamp_lastread);
printf("Conn %d: %d bytes waiting on outbuf (last written %ld secs ago)\n",i,conn->outbuf_datalen,
now.tv_sec - conn->timestamp_lastwritten);
}
circuit_dump_by_conn(conn); /* dump info about all the circuits using this conn */
printf("\n");

5
src/or/or.h
View File

@ -188,11 +188,15 @@ typedef struct
int inbuflen;
int inbuf_datalen;
int inbuf_reached_eof;
long timestamp_lastread;
char *outbuf;
int outbuflen; /* how many bytes are allocated for the outbuf? */
int outbuf_flushlen; /* how much data should we try to flush from the outbuf? */
int outbuf_datalen; /* how much data is there total on the outbuf? */
long timestamp_lastwritten;
long timestamp_created;
// uint16_t aci; /* anonymous connection identifier */
@ -357,6 +361,7 @@ typedef struct
int LinkPadding;
int DirRebuildPeriod;
int DirFetchPeriod;
int KeepalivePeriod;
int Role;
int loglevel;
} or_options_t;