mirror of
https://gitlab.torproject.org/tpo/core/tor.git
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339 lines
12 KiB
C
339 lines
12 KiB
C
/* Copyright 2001,2002 Roger Dingledine, Matej Pfajfar. */
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/* See LICENSE for licensing information */
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/* $Id$ */
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#include "or.h"
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int connection_exit_process_inbuf(connection_t *conn) {
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assert(conn && conn->type == CONN_TYPE_EXIT);
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if(conn->inbuf_reached_eof) {
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/* eof reached, kill it. */
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log(LOG_DEBUG,"connection_exit_process_inbuf(): conn reached eof. Closing.");
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return -1;
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}
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log(LOG_DEBUG,"connection_exit_process_inbuf(): state %d.",conn->state);
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switch(conn->state) {
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case EXIT_CONN_STATE_CONNECTING:
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log(LOG_DEBUG,"connection_exit_process_inbuf(): text from server while in 'connecting' state. Leaving it on buffer.");
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return 0;
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case EXIT_CONN_STATE_OPEN:
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if(connection_package_raw_inbuf(conn) < 0)
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return -1;
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circuit_consider_stop_edge_reading(circuit_get_by_conn(conn), EDGE_EXIT);
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return 0;
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}
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return 0;
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}
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int connection_exit_finished_flushing(connection_t *conn) {
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int e, len=sizeof(e);
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assert(conn && conn->type == CONN_TYPE_EXIT);
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switch(conn->state) {
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case EXIT_CONN_STATE_CONNECTING:
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if (getsockopt(conn->s, SOL_SOCKET, SO_ERROR, &e, &len) < 0) { /* not yet */
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if(errno != EINPROGRESS){
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/* yuck. kill it. */
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log(LOG_DEBUG,"connection_exit_finished_flushing(): in-progress connect failed. Removing.");
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return -1;
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} else {
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log(LOG_DEBUG,"connection_exit_finished_flushing(): in-progress connect still waiting.");
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return 0; /* no change, see if next time is better */
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}
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}
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/* the connect has finished. */
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log(LOG_DEBUG,"connection_exit_finished_flushing(): Connection to %s:%u established.",
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conn->address,conn->port);
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conn->state = EXIT_CONN_STATE_OPEN;
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connection_watch_events(conn, POLLIN); /* stop writing, continue reading */
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if(connection_wants_to_flush(conn)) /* in case there are any queued data cells */
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connection_start_writing(conn);
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return
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connection_exit_send_connected(conn) || /* deliver a 'connected' data cell back through the circuit. */
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connection_process_inbuf(conn); /* in case the server has written anything */
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case EXIT_CONN_STATE_OPEN:
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/* FIXME down the road, we'll clear out circuits that are pending to close */
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log(LOG_DEBUG,"connection_exit_finished_flushing(): finished flushing.");
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connection_stop_writing(conn);
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connection_consider_sending_sendme(conn, EDGE_EXIT);
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return 0;
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default:
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log(LOG_DEBUG,"Bug: connection_exit_finished_flushing() called in unexpected state.");
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return 0;
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}
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return 0;
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}
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int connection_exit_send_connected(connection_t *conn) {
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circuit_t *circ;
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cell_t cell;
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assert(conn);
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circ = circuit_get_by_conn(conn);
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if(!circ) {
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log(LOG_DEBUG,"connection_exit_send_connected(): client-side sent destroy just as we completed server connection. Closing.");
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return -1;
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}
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memset(&cell, 0, sizeof(cell_t));
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cell.aci = circ->p_aci;
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cell.command = CELL_DATA;
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*(uint16_t *)(cell.payload+2) = htons(conn->topic_id);
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*cell.payload = TOPIC_COMMAND_CONNECTED;
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cell.length = TOPIC_HEADER_SIZE;
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log(LOG_INFO,"connection_exit_send_connected(): passing back cell (aci %d).",circ->p_aci);
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if(circuit_deliver_data_cell_from_edge(&cell, circ, EDGE_EXIT) < 0) {
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log(LOG_DEBUG,"connection_exit_send_connected(): circuit_deliver_data_cell (backward) failed. Closing.");
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circuit_close(circ);
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return 0;
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}
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return 0;
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}
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int connection_exit_begin_conn(cell_t *cell, circuit_t *circ) {
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connection_t *n_conn;
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char *comma;
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if(!memchr(cell->payload + TOPIC_HEADER_SIZE,0,cell->length - TOPIC_HEADER_SIZE)) {
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log(LOG_WARNING,"connection_exit_begin_conn(): topic begin cell has no \\0. Dropping.");
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return 0;
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}
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comma = strchr(cell->payload + TOPIC_HEADER_SIZE, ',');
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if(!comma) {
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log(LOG_WARNING,"connection_exit_begin_conn(): topic begin cell has no comma. Dropping.");
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return 0;
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}
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*comma = 0;
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if(!atoi(comma+1)) { /* bad port */
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log(LOG_DEBUG,"connection_exit_begin_conn(): topic begin cell has invalid port. Dropping.");
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return 0;
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}
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log(LOG_DEBUG,"connection_exit_begin_conn(): Creating new exit connection.");
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n_conn = connection_new(CONN_TYPE_EXIT);
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if(!n_conn) {
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log(LOG_DEBUG,"connection_exit_begin_conn(): connection_new failed. Closing.");
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return -1;
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}
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cell->payload[0] = 0;
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n_conn->topic_id = ntohs(*(uint16_t *)(cell->payload+2));
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n_conn->address = strdup(cell->payload + TOPIC_HEADER_SIZE);
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n_conn->port = atoi(comma+1);
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n_conn->state = EXIT_CONN_STATE_RESOLVING;
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n_conn->receiver_bucket = -1; /* edge connections don't do receiver buckets */
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n_conn->bandwidth = -1;
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n_conn->s = -1; /* not yet valid */
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n_conn->n_receive_topicwindow = TOPICWINDOW_START;
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n_conn->p_receive_topicwindow = TOPICWINDOW_START;
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if(connection_add(n_conn) < 0) { /* no space, forget it */
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log(LOG_DEBUG,"connection_exit_begin_conn(): connection_add failed. Closing.");
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connection_free(n_conn);
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return -1;
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}
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/* add it into the linked list of topics on this circuit */
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n_conn->next_topic = circ->n_conn;
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circ->n_conn = n_conn;
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/* send it off to the gethostbyname farm */
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if(dns_resolve(n_conn) < 0) {
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log(LOG_DEBUG,"connection_exit_begin_conn(): Couldn't queue resolve request.");
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connection_remove(n_conn);
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connection_free(n_conn);
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return 0;
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}
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return 0;
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}
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int connection_exit_process_data_cell(cell_t *cell, circuit_t *circ) {
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connection_t *conn;
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int topic_command;
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int topic_id;
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static int num_seen=0;
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/* an outgoing data cell has arrived */
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assert(cell && circ);
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topic_command = *cell->payload;
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topic_id = ntohs(*(uint16_t *)(cell->payload+2));
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log(LOG_DEBUG,"connection_exit_process_data_cell(): command %d topic %d", topic_command, topic_id);
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num_seen++;
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log(LOG_DEBUG,"connection_exit_process_data_cell(): Now seen %d data cells here.", num_seen);
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circuit_consider_sending_sendme(circ, EDGE_EXIT);
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for(conn = circ->n_conn; conn && conn->topic_id != topic_id; conn = conn->next_topic) ;
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/* now conn is either NULL, in which case we don't recognize the topic_id, or
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* it is set, in which case cell is talking about this conn.
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*/
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if(conn && conn->state != EXIT_CONN_STATE_OPEN) {
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if(topic_command == TOPIC_COMMAND_END) {
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log(LOG_ERR,"connection_exit_process_data_cell(): Got an end before we're connected. Marking for close.");
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conn->marked_for_close = 1;
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return 0;
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} else {
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log(LOG_INFO,"connection_exit_process_data_cell(): Got a non-end data cell when not in 'open' state. Dropping.");
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return 0;
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}
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}
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switch(topic_command) {
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case TOPIC_COMMAND_BEGIN:
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if(conn) {
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log(LOG_INFO,"connection_exit_process_data_cell(): begin cell for known topic. Dropping.");
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return 0;
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}
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return connection_exit_begin_conn(cell, circ);
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case TOPIC_COMMAND_DATA:
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if(!conn) {
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log(LOG_INFO,"connection_exit_process_data_cell(): data cell for unknown topic. Dropping.");
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return 0;
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}
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if(--conn->p_receive_topicwindow < 0) { /* is it below 0 after decrement? */
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log(LOG_DEBUG,"connection_exit_process_data_cell(): receive_topicwindow at exit below 0. Killing.");
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return -1; /* AP breaking protocol. kill the whole circuit. */
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}
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log(LOG_DEBUG,"connection_exit_process_data_cell(): willing to receive %d more cells from circ",conn->p_receive_topicwindow);
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if(conn->state != EXIT_CONN_STATE_OPEN) {
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log(LOG_DEBUG,"connection_exit_process_data_cell(): data received while resolving/connecting. Queueing.");
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}
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log(LOG_DEBUG,"connection_exit_process_data_cell(): put %d bytes on outbuf.",cell->length - TOPIC_HEADER_SIZE);
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if(connection_write_to_buf(cell->payload + TOPIC_HEADER_SIZE,
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cell->length - TOPIC_HEADER_SIZE, conn) < 0) {
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log(LOG_INFO,"connection_exit_process_data_cell(): write to buf failed. Marking for close.");
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conn->marked_for_close = 1;
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return 0;
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}
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if(connection_consider_sending_sendme(conn, EDGE_EXIT) < 0)
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conn->marked_for_close = 1;
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return 0;
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case TOPIC_COMMAND_END:
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if(!conn) {
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log(LOG_DEBUG,"connection_exit_process_data_cell(): end cell dropped, unknown topic %d.",topic_id);
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return 0;
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}
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log(LOG_DEBUG,"connection_exit_process_data_cell(): end cell for topic %d. Removing topic.",topic_id);
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#if 0
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/* go through and identify who points to conn. remove conn from the list. */
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if(conn == circ->n_conn) {
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circ->n_conn = conn->next_topic;
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}
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for(prevconn = circ->n_conn; prevconn->next_topic != conn; prevconn = prevconn->next_topic) ;
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prevconn->next_topic = conn->next_topic;
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#endif
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conn->marked_for_close = 1;
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break;
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case TOPIC_COMMAND_CONNECTED:
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log(LOG_INFO,"connection_exit_process_data_cell(): topic connected request unsupported. Dropping.");
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break;
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case TOPIC_COMMAND_SENDME:
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if(!conn) {
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log(LOG_DEBUG,"connection_exit_process_data_cell(): sendme cell dropped, unknown topic %d.",topic_id);
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return 0;
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}
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conn->n_receive_topicwindow += TOPICWINDOW_INCREMENT;
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connection_start_reading(conn);
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connection_package_raw_inbuf(conn); /* handle whatever might still be on the inbuf */
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circuit_consider_stop_edge_reading(circ, EDGE_EXIT);
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break;
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default:
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log(LOG_DEBUG,"connection_exit_process_data_cell(): unknown topic command %d.",topic_command);
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}
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return 0;
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}
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#if 0
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static uint32_t address_to_addr(char *address) {
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struct hostent *rent;
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uint32_t addr;
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char *caddr;
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rent = gethostbyname(address);
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if (!rent) {
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log(LOG_ERR,"address_to_addr(): Could not resolve dest addr %s.",address);
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return 0;
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}
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memcpy(&addr, rent->h_addr,rent->h_length);
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addr = ntohl(addr); /* get it back to host order */
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caddr = (char *)&addr;
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log(LOG_DEBUG,"address_to_addr(): addr is %d %d %d %d",
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caddr[0], caddr[1], caddr[2], caddr[3]);
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return addr;
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}
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#endif
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int connection_exit_connect(connection_t *conn) {
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int s; /* for the new socket */
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struct sockaddr_in dest_addr;
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/* all the necessary info is here. Start the connect() */
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s=socket(PF_INET,SOCK_STREAM,IPPROTO_TCP);
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if (s < 0) {
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log(LOG_ERR,"connection_exit_connect(): Error creating network socket.");
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return -1;
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}
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fcntl(s, F_SETFL, O_NONBLOCK); /* set s to non-blocking */
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memset((void *)&dest_addr,0,sizeof(dest_addr));
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dest_addr.sin_family = AF_INET;
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dest_addr.sin_port = htons(conn->port);
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dest_addr.sin_addr.s_addr = htonl(conn->addr);
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log(LOG_DEBUG,"connection_exit_connect(): Connecting to %s:%u.",conn->address,conn->port);
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if(connect(s,(struct sockaddr *)&dest_addr,sizeof(dest_addr)) < 0) {
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if(errno != EINPROGRESS){
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/* yuck. kill it. */
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perror("connect");
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log(LOG_DEBUG,"connection_exit_connect(): Connect failed.");
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return -1;
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} else {
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/* it's in progress. set state appropriately and return. */
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conn->s = s;
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connection_set_poll_socket(conn);
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conn->state = EXIT_CONN_STATE_CONNECTING;
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log(LOG_DEBUG,"connection_exit_connect(): connect in progress, socket %d.",s);
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connection_watch_events(conn, POLLOUT | POLLIN);
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return 0;
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}
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}
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/* it succeeded. we're connected. */
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log(LOG_DEBUG,"connection_exit_connect(): Connection to %s:%u established.",conn->address,conn->port);
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conn->s = s;
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connection_set_poll_socket(conn);
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conn->state = EXIT_CONN_STATE_OPEN;
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if(connection_wants_to_flush(conn)) { /* in case there are any queued data cells */
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log(LOG_ERR,"connection_exit_connect(): tell roger: newly connected conn had data waiting!");
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// connection_start_writing(conn);
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}
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// connection_process_inbuf(conn);
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connection_watch_events(conn, POLLIN);
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/* also, deliver a 'connected' cell back through the circuit. */
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return connection_exit_send_connected(conn);
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}
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