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/* Copyright 2001,2002 Roger Dingledine, Matej Pfajfar. */
/* See LICENSE for licensing information */
/* $Id$ */
#include "or.h"
extern or_options_t options; /* command-line and config-file options */
/**************************************************************/
static void cell_pack(char *dest, const cell_t *src) {
*(uint16_t*)dest = htons(src->aci);
*(uint8_t*)(dest+2) = src->command;
*(uint8_t*)(dest+3) = src->length;
*(uint32_t*)(dest+4) = 0; /* Reserved */
memcpy(dest+8, src->payload, CELL_PAYLOAD_SIZE);
}
static void cell_unpack(cell_t *dest, const char *src) {
dest->aci = ntohs(*(uint16_t*)(src));
dest->command = *(uint8_t*)(src+2);
dest->length = *(uint8_t*)(src+3);
dest->seq = ntohl(*(uint32_t*)(src+4));
memcpy(dest->payload, src+8, CELL_PAYLOAD_SIZE);
}
/**************************************************************/
int connection_or_process_inbuf(connection_t *conn) {
assert(conn && conn->type == CONN_TYPE_OR);
if(conn->inbuf_reached_eof) {
log_fn(LOG_DEBUG,"conn reached eof. Closing.");
return -1;
}
if(conn->state != OR_CONN_STATE_OPEN)
return 0; /* don't do anything */
return connection_process_cell_from_inbuf(conn);
}
int connection_or_finished_flushing(connection_t *conn) {
int e, len=sizeof(e);
assert(conn && conn->type == CONN_TYPE_OR);
switch(conn->state) {
case OR_CONN_STATE_CONNECTING:
if (getsockopt(conn->s, SOL_SOCKET, SO_ERROR, (void*)&e, &len) < 0) { /* not yet */
if(!ERRNO_CONN_EINPROGRESS(errno)){
log_fn(LOG_DEBUG,"in-progress connect failed. Removing.");
return -1;
} else {
return 0; /* no change, see if next time is better */
}
}
/* the connect has finished. */
log_fn(LOG_DEBUG,"OR connect() to router %s:%u finished.",
conn->address,conn->port);
if(connection_tls_start_handshake(conn, 0) < 0)
return -1;
case OR_CONN_STATE_OPEN:
connection_stop_writing(conn);
return 0;
default:
log_fn(LOG_ERR,"BUG: called in unexpected state.");
return 0;
}
}
/*********************/
connection_t *connection_or_connect(routerinfo_t *router) {
connection_t *conn;
assert(router);
if(router_is_me(router->addr, router->or_port)) {
/* this is me! don't connect to me. */
log(LOG_DEBUG,"connection_or_connect(): This is me. Skipping.");
return NULL;
}
/* this function should never be called if we're already connected to router, but */
/* check first to be sure */
conn = connection_exact_get_by_addr_port(router->addr,router->or_port);
if(conn)
return conn;
conn = connection_new(CONN_TYPE_OR);
if(!conn) {
return NULL;
}
/* set up conn so it's got all the data we need to remember */
conn->addr = router->addr;
conn->port = router->or_port;
conn->bandwidth = router->bandwidth;
conn->pkey = crypto_pk_dup_key(router->pkey);
conn->address = strdup(router->address);
if(connection_add(conn) < 0) { /* no space, forget it */
connection_free(conn);
return NULL;
}
switch(connection_connect(conn, router->address, router->addr, router->or_port)) {
case -1:
connection_remove(conn);
connection_free(conn);
return NULL;
case 0:
connection_set_poll_socket(conn);
connection_watch_events(conn, POLLIN | POLLOUT | POLLERR);
/* writable indicates finish, readable indicates broken link,
error indicates broken link on windows */
conn->state = OR_CONN_STATE_CONNECTING;
return conn;
/* case 1: fall through */
}
connection_set_poll_socket(conn);
if(connection_tls_start_handshake(conn, 0) >= 0)
return conn;
/* failure */
connection_remove(conn);
connection_free(conn);
return NULL;
}
/* ********************************** */
int connection_write_cell_to_buf(const cell_t *cellp, connection_t *conn) {
char networkcell[CELL_NETWORK_SIZE];
char *n = networkcell;
cell_pack(n, cellp);
return connection_write_to_buf(n, CELL_NETWORK_SIZE, conn);
}
/* if there's a whole cell there, pull it off and process it. */
int connection_process_cell_from_inbuf(connection_t *conn) {
char buf[CELL_NETWORK_SIZE];
cell_t cell;
log_fn(LOG_DEBUG,"%d: starting, inbuf_datalen %d.",conn->s,conn->inbuf_datalen);
if(conn->inbuf_datalen < CELL_NETWORK_SIZE) /* entire response available? */
return 0; /* not yet */
connection_fetch_from_buf(buf, CELL_NETWORK_SIZE, conn);
/* retrieve cell info from buf (create the host-order struct from the network-order string) */
cell_unpack(&cell, buf);
command_process_cell(&cell, conn);
return connection_process_inbuf(conn); /* process the remainder of the buffer */
}
/*
Local Variables:
mode:c
indent-tabs-mode:nil
c-basic-offset:2
End:
*/
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