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tor/src/or/main.c

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/* Copyright 2001,2002 Roger Dingledine, Matej Pfajfar. */
/* See LICENSE for licensing information */
/* $Id$ */
#include "or.h"
/********* START VARIABLES **********/
or_options_t options; /* command-line and config-file options */
int global_role;
static connection_t *connection_array[MAXCONNECTIONS] =
{ NULL };
static struct pollfd poll_array[MAXCONNECTIONS];
static int nfds=0; /* number of connections currently active */
static int please_dumpstats=0; /* whether we should dump stats during the loop */
static int please_fetch_directory=0; /* whether we should fetch a new directory */
/* private key */
static crypto_pk_env_t *privatekey;
routerinfo_t *my_routerinfo=NULL;
/********* END VARIABLES ************/
void setprivatekey(crypto_pk_env_t *k) {
privatekey = k;
}
crypto_pk_env_t *getprivatekey(void) {
assert(privatekey);
return privatekey;
}
/****************************************************************************
*
* This section contains accessors and other methods on the connection_array
* and poll_array variables (which are global within this file and unavailable
* outside it).
*
****************************************************************************/
int connection_add(connection_t *conn) {
if(nfds >= options.MaxConn-1) {
log(LOG_INFO,"connection_add(): failing because nfds is too high.");
return -1;
}
conn->poll_index = nfds;
connection_set_poll_socket(conn);
connection_array[nfds] = conn;
/* zero these out here, because otherwise we'll inherit values from the previously freed one */
poll_array[nfds].events = 0;
poll_array[nfds].revents = 0;
nfds++;
log(LOG_INFO,"connection_add(): new conn type %d, socket %d, nfds %d.",conn->type, conn->s, nfds);
return 0;
}
void connection_set_poll_socket(connection_t *conn) {
poll_array[conn->poll_index].fd = conn->s;
}
int connection_remove(connection_t *conn) {
int current_index;
assert(conn);
assert(nfds>0);
log(LOG_INFO,"connection_remove(): removing socket %d, nfds now %d",conn->s, nfds-1);
circuit_about_to_close_connection(conn); /* if it's an edge conn, remove it from the list
* of conn's on this circuit. If it's not on an edge,
* flush and send destroys for all circuits on this conn
*/
current_index = conn->poll_index;
if(current_index == nfds-1) { /* this is the end */
nfds--;
return 0;
}
/* we replace this one with the one at the end, then free it */
nfds--;
poll_array[current_index].fd = poll_array[nfds].fd;
poll_array[current_index].events = poll_array[nfds].events;
poll_array[current_index].revents = poll_array[nfds].revents;
connection_array[current_index] = connection_array[nfds];
connection_array[current_index]->poll_index = current_index;
return 0;
}
connection_t *connection_twin_get_by_addr_port(uint32_t addr, uint16_t port) {
/* Find a connection to the router described by addr and port,
* or alternately any router which knows its key.
* This connection *must* be in 'open' state.
* If not, return NULL.
*/
int i;
connection_t *conn;
routerinfo_t *router;
/* first check if it's there exactly */
conn = connection_exact_get_by_addr_port(addr,port);
if(conn && connection_state_is_open(conn)) {
log(LOG_INFO,"connection_twin_get_by_addr_port(): Found exact match.");
return conn;
}
/* now check if any of the other open connections are a twin for this one */
router = router_get_by_addr_port(addr,port);
if(!router)
return NULL;
for(i=0;i<nfds;i++) {
conn = connection_array[i];
assert(conn);
if(connection_state_is_open(conn) && !crypto_pk_cmp_keys(conn->pkey, router->pkey)) {
log(LOG_INFO,"connection_twin_get_by_addr_port(): Found twin (%s).",conn->address);
return conn;
}
}
/* guess not */
return NULL;
}
connection_t *connection_exact_get_by_addr_port(uint32_t addr, uint16_t port) {
int i;
connection_t *conn;
for(i=0;i<nfds;i++) {
conn = connection_array[i];
assert(conn);
if(conn->addr == addr && conn->port == port)
return conn;
}
return NULL;
}
connection_t *connection_get_by_type(int type) {
int i;
connection_t *conn;
for(i=0;i<nfds;i++) {
conn = connection_array[i];
if(conn->type == type)
return conn;
}
return NULL;
}
void connection_watch_events(connection_t *conn, short events) {
assert(conn && conn->poll_index < nfds);
poll_array[conn->poll_index].events = events;
}
void connection_stop_reading(connection_t *conn) {
assert(conn && conn->poll_index < nfds);
log(LOG_DEBUG,"connection_stop_reading() called.");
if(poll_array[conn->poll_index].events & POLLIN)
poll_array[conn->poll_index].events -= POLLIN;
}
void connection_start_reading(connection_t *conn) {
assert(conn && conn->poll_index < nfds);
poll_array[conn->poll_index].events |= POLLIN;
}
void connection_stop_writing(connection_t *conn) {
assert(conn && conn->poll_index < nfds);
if(poll_array[conn->poll_index].events & POLLOUT)
poll_array[conn->poll_index].events -= POLLOUT;
}
void connection_start_writing(connection_t *conn) {
assert(conn && conn->poll_index < nfds);
poll_array[conn->poll_index].events |= POLLOUT;
}
void check_conn_read(int i) {
int retval;
connection_t *conn;
if(poll_array[i].revents & POLLIN) { /* something to read */
conn = connection_array[i];
assert(conn);
// log(LOG_DEBUG,"check_conn_read(): socket %d has something to read.",conn->s);
if (conn->type == CONN_TYPE_OP_LISTENER) {
retval = connection_op_handle_listener_read(conn);
} else if (conn->type == CONN_TYPE_OR_LISTENER) {
retval = connection_or_handle_listener_read(conn);
} else if (conn->type == CONN_TYPE_AP_LISTENER) {
retval = connection_ap_handle_listener_read(conn);
} else if (conn->type == CONN_TYPE_DIR_LISTENER) {
retval = connection_dir_handle_listener_read(conn);
} else {
retval = connection_read_to_buf(conn);
if (retval < 0 && conn->type == CONN_TYPE_DIR && conn->state == DIR_CONN_STATE_CONNECTING) {
/* it's a directory server and connecting failed: forget about this router */
router_forget_router(conn->addr,conn->port); /* FIXME i don't think this function works. */
}
if (retval >= 0) { /* all still well */
retval = connection_process_inbuf(conn);
// log(LOG_DEBUG,"check_conn_read(): connection_process_inbuf returned %d.",retval);
if(retval >= 0 && !connection_state_is_open(conn) && conn->receiver_bucket == 0) {
log(LOG_DEBUG,"check_conn_read(): receiver bucket reached 0 before handshake finished. Closing.");
retval = -1;
}
}
}
if(retval < 0) { /* this connection is broken. remove it */
log(LOG_INFO,"check_conn_read(): Connection broken, removing.");
connection_remove(conn);
connection_free(conn);
if(i<nfds) { /* we just replaced the one at i with a new one.
process it too. */
check_conn_read(i);
}
}
}
}
void check_conn_write(int i) {
int retval;
connection_t *conn;
if(poll_array[i].revents & POLLOUT) { /* something to write */
conn = connection_array[i];
// log(LOG_DEBUG,"check_conn_write(): socket %d wants to write.",conn->s);
if(connection_is_listener(conn)) {
log(LOG_DEBUG,"check_conn_write(): Got a listener socket. Can't happen!");
retval = -1;
} else {
/* else it's an OP, OR, or exit */
retval = connection_flush_buf(conn); /* conns in CONNECTING state will fall through... */
if(retval == 0) { /* it's done flushing */
retval = connection_finished_flushing(conn); /* ...and get handled here. */
}
}
if(retval < 0) { /* this connection is broken. remove it. */
log(LOG_DEBUG,"check_conn_write(): Connection broken, removing.");
connection_remove(conn);
connection_free(conn);
if(i<nfds) { /* we just replaced the one at i with a new one.
process it too. */
check_conn_write(i);
}
}
}
}
void check_conn_marked(int i) {
connection_t *conn;
conn = connection_array[i];
assert(conn);
if(conn->marked_for_close) {
log(LOG_DEBUG,"check_conn_marked(): Cleaning up connection.");
if(conn->s >= 0) { /* might be an incomplete exit connection */
/* FIXME there's got to be a better way to check for this -- and make other checks? */
connection_flush_buf(conn); /* flush it first */
}
connection_remove(conn);
connection_free(conn);
if(i<nfds) { /* we just replaced the one at i with a new one.
process it too. */
check_conn_marked(i);
}
}
}
int prepare_for_poll(int *timeout) {
int i;
// connection_t *conn = NULL;
connection_t *tmpconn;
struct timeval now; //soonest;
static long current_second = 0; /* from previous calls to gettimeofday */
static long time_to_fetch_directory = 0;
// int ms_until_conn;
cell_t cell;
if(gettimeofday(&now,NULL) < 0)
return -1;
if(now.tv_sec > current_second) { /* the second has rolled over. check more stuff. */
if(!(options.Role & ROLE_DIR_SERVER)) {
if(time_to_fetch_directory < now.tv_sec) {
/* it's time to fetch a new directory */
/* NOTE directory servers do not currently fetch directories.
* Hope this doesn't bite us later.
*/
directory_initiate_fetch(router_pick_directory_server());
time_to_fetch_directory = now.tv_sec + options.DirFetchPeriod;
}
}
/* do housekeeping for each connection */
for(i=0;i<nfds;i++) {
tmpconn = connection_array[i];
connection_increment_receiver_bucket(tmpconn);
connection_array[i]->onions_handled_this_second = 0;
/* check connections to see whether we should send a keepalive, expire, or wait */
if(!connection_speaks_cells(tmpconn))
continue; /* this conn type doesn't send cells */
if(now.tv_sec >= tmpconn->timestamp_lastwritten + options.KeepalivePeriod) {
if((!(options.Role & ROLE_OR_CONNECT_ALL) && !circuit_get_by_conn(tmpconn)) ||
(!connection_state_is_open(tmpconn))) {
/* we're an onion proxy, with no circuits; or our handshake has expired. 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;
if(connection_write_cell_to_buf(&cell, tmpconn) < 0)
tmpconn->marked_for_close = 1;
}
}
}
/* blow away any connections that need to die. can't do this later
* because we might open up a circuit and not realize it we're about to cull it.
*/
for(i=0;i<nfds;i++)
check_conn_marked(i);
current_second = now.tv_sec; /* remember which second it is, for next time */
}
if(onion_pending_check()) {
/* there's an onion pending. check for new things to do, but don't wait any time */
*timeout = 0;
} else {
*timeout = 1000 - (now.tv_usec / 1000); /* how many milliseconds til the next second? */
}
return 0;
}
/* Link padding stuff left here for fun. Not used now. */
#if 0
if(options.LinkPadding) {
/* now check which conn wants to speak soonest */
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' have a valid send_timeval */
while(tv_cmp(&tmpconn->send_timeval,&now) <= 0) { /* send_timeval has already passed, let it send a cell */
connection_send_cell(tmpconn);
}
if(!conn || tv_cmp(&tmpconn->send_timeval, &soonest) < 0) { /* this is the best choice so far */
conn = tmpconn;
soonest.tv_sec = conn->send_timeval.tv_sec;
soonest.tv_usec = conn->send_timeval.tv_usec;
}
}
if(conn) { /* we might want to set *timeout sooner */
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(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;
}
}
}
#endif
int do_main_loop(void) {
int i;
int timeout;
int poll_result;
crypto_pk_env_t *prkey;
/* load the routers file */
if(router_get_list_from_file(options.RouterFile) < 0) {
log(LOG_ERR,"Error loading router list.");
return -1;
}
/* load the private key, if we're supposed to have one */
if(ROLE_IS_OR(global_role)) {
prkey = crypto_new_pk_env(CRYPTO_PK_RSA);
if (!prkey) {
log(LOG_ERR,"Error creating a crypto environment.");
return -1;
}
if (crypto_pk_read_private_key_from_filename(prkey, options.PrivateKeyFile))
{
log(LOG_ERR,"Error loading private key.");
return -1;
}
setprivatekey(prkey);
}
/* start-up the necessary connections based on global_role. This is where we
* try to connect to all the other ORs, and start the listeners */
retry_all_connections(options.Role, options.ORPort,
options.OPPort, options.APPort, options.DirPort);
for(;;) {
if(please_dumpstats) {
dumpstats();
please_dumpstats = 0;
}
if(please_fetch_directory) {
if(options.Role & ROLE_DIR_SERVER) {
if(router_get_list_from_file(options.RouterFile) < 0) {
log(LOG_ERR,"Error reloading router list. Continuing with old list.");
}
} else {
directory_initiate_fetch(router_pick_directory_server());
}
please_fetch_directory = 0;
}
if(prepare_for_poll(&timeout) < 0) {
log(LOG_DEBUG,"do_main_loop(): prepare_for_poll failed, exiting.");
return -1;
}
/* now timeout is the value we'll hand to poll. It's either -1, meaning
* don't timeout, else it indicates the soonest event (either the
* one-second rollover for refilling receiver buckets, or the soonest
* conn that needs to send a cell)
*/
/* poll until we have an event, or it's time to do something */
poll_result = poll(poll_array, nfds, timeout);
#if 0 /* let catch() handle things like ^c, and otherwise don't worry about it */
if(poll_result < 0) {
log(LOG_ERR,"do_main_loop(): poll failed.");
if(errno != EINTR) /* let the program survive things like ^z */
return -1;
}
#endif
if(poll_result == 0) {
/* poll timed out without anything to do. process a pending onion, if any. */
onion_pending_process_one();
}
if(poll_result > 0) { /* we have at least one connection to deal with */
/* do all the reads first, so we can detect closed sockets */
for(i=0;i<nfds;i++)
check_conn_read(i); /* this also blows away broken connections */
/* then do the writes */
for(i=0;i<nfds;i++)
check_conn_write(i);
/* any of the conns need to be closed now? */
for(i=0;i<nfds;i++)
check_conn_marked(i);
}
/* refilling buckets and sending cells happens at the beginning of the
* next iteration of the loop, inside prepare_for_poll()
*/
}
}
static void catch(int the_signal) {
switch(the_signal) {
// case SIGABRT:
case SIGTERM:
case SIGINT:
log(LOG_NOTICE,"Catching signal %d, exiting cleanly.", the_signal);
exit(0);
case SIGHUP:
please_fetch_directory = 1;
break;
case SIGUSR1:
please_dumpstats = 1;
break;
default:
log(LOG_ERR,"Caught signal that we can't handle??");
}
}
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), 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], 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");
}
}
int dump_router_to_string(char *s, int maxlen, routerinfo_t *router) {
char *pkey;
int pkeylen;
int written;
if(crypto_pk_write_public_key_to_string(router->pkey,&pkey,&pkeylen)<0) {
log(LOG_ERR,"dump_router_to_string(): write pkey to string failed!");
return 0;
}
written = snprintf(s, maxlen, "%s %d %d %d %d %d\n%s\n",
router->address,
router->or_port,
router->op_port,
router->ap_port,
router->dir_port,
router->bandwidth,
pkey);
free(pkey);
return written;
}
void dump_directory_to_string(char *s, int maxlen) {
int i;
connection_t *conn;
routerinfo_t *router;
int written;
/* first write my own info */
if(my_routerinfo) {
written = dump_router_to_string(s, maxlen, my_routerinfo);
maxlen -= written;
s += written;
}
/* now write info for other routers */
for(i=0;i<nfds;i++) {
conn = connection_array[i];
if(conn->type != CONN_TYPE_OR)
continue; /* we only want to list ORs */
if(conn->state != OR_CONN_STATE_OPEN)
continue; /* we only want to list ones that successfully handshaked */
router = router_get_by_addr_port(conn->addr,conn->port);
if(!router) {
log(LOG_ERR,"dump_directory_to_string(): couldn't find router %d:%d!",conn->addr,conn->port);
continue;
}
written = dump_router_to_string(s, maxlen, router);
if(written < 0 || written > maxlen) {
/* apparently different glibcs do different things on error.. so check both */
log(LOG_ERR,"dump_directory_to_string(): tried to exceed string length.");
s[maxlen-1] = 0; /* make sure it's null terminated */
return;
}
maxlen -= written;
s += written;
}
}
int main(int argc, char *argv[]) {
int retval = 0;
if(getconfig(argc,argv,&options))
exit(1);
log(options.loglevel,NULL); /* assign logging severity level from options */
global_role = options.Role; /* assign global_role from options. FIXME: remove from global namespace later. */
if(options.Role & ROLE_OR_LISTEN) { /* only spawn dns handlers if we're a router */
if(dns_master_start() < 0) {
log(LOG_ERR,"main(): We're running without a dns handler. Bad news.");
}
}
init_tracked_tree(); /* initialize the replay detection tree */
init_cache_tree(); /* initialize the dns resolve tree */
signal (SIGINT, catch); /* catch kills so we can exit cleanly */
signal (SIGTERM, catch);
signal (SIGUSR1, catch); /* to dump stats to stdout */
signal (SIGHUP, catch); /* to reload directory */
crypto_global_init();
retval = do_main_loop();
crypto_global_cleanup();
return retval;
}
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