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cleaned up new_route()

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now it deals gracefully with too few connected routers (i think)


svn:r77
This commit is contained in:
Roger Dingledine 2002-08-23 03:35:44 +00:00
parent 01aadefbfc
commit 08adaa4b46
3 changed files with 71 additions and 47 deletions
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4
src/or/connection.c
View File

@ -194,7 +194,7 @@ int connection_handle_listener_read(connection_t *conn, int new_type, int new_st
}
log(LOG_DEBUG,"Connection accepted on socket %d.",news);
fcntl(news, F_SETFL, O_NONBLOCK); /* set s to non-blocking */
fcntl(news, F_SETFL, O_NONBLOCK); /* set news to non-blocking */
newconn = connection_new(new_type);
newconn->s = news;
@ -207,7 +207,7 @@ int connection_handle_listener_read(connection_t *conn, int new_type, int new_st
/* learn things from parent, so we can perform auth */
memcpy(&newconn->local,&conn->local,sizeof(struct sockaddr_in));
newconn->prkey = conn->prkey;
// newconn->address = strdup(get_string_from_remote()) FIXME ;
newconn->address = strdup(inet_ntoa(*(struct in_addr *)&remote.sin_addr.s_addr)); /* remember the remote address */
if(connection_add(newconn) < 0) { /* no space, forget it */
connection_free(newconn);

4
src/or/main.c
View File

@ -108,7 +108,7 @@ connection_t *connection_twin_get_by_addr_port(uint32_t addr, uint16_t port) {
/* 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_DEBUG,"connection_twin_get_by_addr_port(): Found exact match.");
log(LOG_INFO,"connection_twin_get_by_addr_port(): Found exact match.");
return conn;
}
@ -122,7 +122,7 @@ connection_t *connection_twin_get_by_addr_port(uint32_t addr, uint16_t port) {
conn = connection_array[i];
assert(conn);
if(connection_state_is_open(conn) && !pkey_cmp(conn->pkey, router->pkey)) {
log(LOG_DEBUG,"connection_twin_get_by_addr_port(): Found twin (%s).",conn->address);
log(LOG_INFO,"connection_twin_get_by_addr_port(): Found twin (%s).",conn->address);
return conn;
}
}

108
src/or/onion.c
View File

@ -95,60 +95,84 @@ int chooselen(double cw)
unsigned int *new_route(double cw, routerinfo_t **rarray, size_t rarray_len, size_t *rlen)
{
int routelen = 0;
int i = 0;
int i, j;
int num_acceptable_routers = 0;
int retval = 0;
unsigned int *route = NULL;
unsigned int oldchoice, choice;
assert((cw >= 0) && (cw < 1) && (rarray) && (rlen) ); /* valid parameters */
routelen = chooselen(cw);
if (routelen == -1)
{
log(LOG_ERR,"Choosing route length failed.");
return NULL;
routelen = chooselen(cw);
if (routelen == -1) {
log(LOG_ERR,"Choosing route length failed.");
return NULL;
}
log(LOG_DEBUG,"new_route(): Chosen route length %d.",routelen);
for(i=0;i<rarray_len;i++) {
log(LOG_DEBUG,"Contemplating whether router %d is any good...",i);
if(!connection_exact_get_by_addr_port(rarray[i]->addr, rarray[i]->or_port)) {
log(LOG_DEBUG,"Nope, %d is not connected.",i);
goto next_i_loop;
}
log(LOG_DEBUG,"new_route(): Chosen route length %u.",routelen);
/* FIXME need to figure out how many routers we can actually choose from.
* We can get into an infinite loop if there are too few. */
/* allocate memory for the new route */
route = (unsigned int *)malloc(routelen * sizeof(unsigned int));
if (!route)
{
log(LOG_ERR,"Memory allocation failed.");
return NULL;
}
oldchoice = rarray_len;
for(i=0;i<routelen;i++)
{
log(LOG_DEBUG,"new_route() : Choosing hop %u.",i);
retval = crypto_pseudo_rand(sizeof(unsigned int),(unsigned char *)&choice);
if (retval)
{
free((void *)route);
return NULL;
for(j=0;j<i;j++) {
if(!pkey_cmp(rarray[i]->pkey, rarray[j]->pkey)) {
/* these guys are twins. so we've already counted him. */
log(LOG_DEBUG,"Nope, %d is a twin of %d.",i,j);
goto next_i_loop;
}
}
num_acceptable_routers++;
log(LOG_DEBUG,"I like %d. num_acceptable_routers now %d.",i, num_acceptable_routers);
next_i_loop:
}
if(num_acceptable_routers < routelen) {
log(LOG_DEBUG,"new_route(): Cutting routelen from %d to %d.",routelen, num_acceptable_routers);
routelen = num_acceptable_routers;
}
if(routelen < 1) {
log(LOG_ERR,"new_route(): Didn't find any acceptable routers. Failing.");
return NULL;
}
/* allocate memory for the new route */
route = (unsigned int *)malloc(routelen * sizeof(unsigned int));
if (!route) {
log(LOG_ERR,"Memory allocation failed.");
return NULL;
}
oldchoice = rarray_len;
for(i=0;i<routelen;i++) {
log(LOG_DEBUG,"new_route(): Choosing hop %u.",i);
retval = crypto_pseudo_rand(sizeof(unsigned int),(unsigned char *)&choice);
if (retval) {
free((void *)route);
return NULL;
}
choice = choice % (rarray_len);
log(LOG_DEBUG,"new_route(): Contemplating router %u.",choice);
while(choice == oldchoice ||
(oldchoice < rarray_len && !pkey_cmp(rarray[choice]->pkey, rarray[oldchoice]->pkey)) ||
!connection_twin_get_by_addr_port(rarray[choice]->addr, rarray[choice]->or_port)) {
/* Same router as last choice, or router twin,
* or no routers with that key are connected to us.
* Try again. */
log(LOG_DEBUG,"new_route(): Picked a router %d that won't work as next hop.",choice);
choice++;
choice = choice % (rarray_len);
log(LOG_DEBUG,"new_route() : Chosen router %u.",choice);
if (choice == oldchoice ||
(oldchoice < rarray_len && !pkey_cmp(rarray[choice]->pkey, rarray[oldchoice]->pkey)) ||
!connection_twin_get_by_addr_port(rarray[choice]->addr, rarray[choice]->or_port)) {
/* Same router as last choice, or router twin,
* or no routers with that key are connected to us.
* Try again. */
i--;
continue;
}
oldchoice = choice;
route[i] = choice;
}
log(LOG_DEBUG,"new_route(): Chosen router %u for hop %u.",choice,i);
oldchoice = choice;
route[i] = choice;
}
*rlen = routelen;
return route;
*rlen = routelen;
return route;
}
/* creates a new onion from route, stores it and its length into bufp and lenp respectively */