mirror of
https://gitlab.torproject.org/tpo/core/tor.git
synced 2024-11-24 04:13:28 +01:00
make a relay_header_t struct and pack/unpack funcs
split 7-byte stream_id string into 2-byte recognized and 2-byte stream_id fix two seg faults in fetch_from_buf_http fix several lurking seg faults in handling unexpected relay cells still need to * clean up relay_crypt * use relay dummies if there's going to be a conflict with rh.recognized * check for a conflict when generating stream_ids svn:r953
This commit is contained in:
Roger Dingledine
parent
eb730c41c8
commit
45a66c6955
@ -375,12 +375,12 @@ int fetch_from_buf_http(buf_t *buf,
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if(headers_out) {
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*headers_out = tor_malloc(headerlen+1);
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memcpy(*headers_out,buf->mem,headerlen);
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*headers_out[headerlen] = 0; /* null terminate it */
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(*headers_out)[headerlen] = 0; /* null terminate it */
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}
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if(body_out) {
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*body_out = tor_malloc(bodylen+1);
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memcpy(*body_out,buf->mem+headerlen,bodylen);
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*body_out[bodylen] = 0; /* null terminate it */
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(*body_out)[bodylen] = 0; /* null terminate it */
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}
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buf_remove_from_front(buf, headerlen+bodylen);
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return 1;
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112
src/or/circuit.c
112
src/or/circuit.c
@ -6,6 +6,9 @@
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extern or_options_t options; /* command-line and config-file options */
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static int relay_crypt(circuit_t *circ, char *in, char cell_direction,
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crypt_path_t **layer_hint, char *recognized);
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static connection_t *relay_lookup_conn(circuit_t *circ, cell_t *cell, int cell_direction);
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static void circuit_free_cpath_node(crypt_path_t *victim);
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static circ_id_t get_unique_circ_id_by_conn(connection_t *conn, int circ_id_type);
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@ -310,11 +313,14 @@ int circuit_stream_is_being_handled(connection_t *conn) {
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/* update digest from the payload of cell. assign integrity part to cell. */
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void relay_set_digest(crypto_digest_env_t *digest, cell_t *cell) {
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uint32_t integrity;
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relay_header_t rh;
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crypto_digest_add_bytes(digest, cell->payload, CELL_PAYLOAD_SIZE);
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crypto_digest_get_digest(digest, (char *)&integrity, 4);
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log_fn(LOG_DEBUG,"Putting digest of %u into relay cell.",integrity);
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SET_CELL_RELAY_INTEGRITY(*cell, integrity);
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relay_header_unpack(&rh, cell->payload);
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rh.integrity = integrity;
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relay_header_pack(cell->payload, &rh);
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}
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/* update digest from the payload of cell (with the integrity part set
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@ -322,10 +328,14 @@ void relay_set_digest(crypto_digest_env_t *digest, cell_t *cell) {
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*/
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int relay_check_digest(crypto_digest_env_t *digest, cell_t *cell) {
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uint32_t received_integrity, calculated_integrity;
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relay_header_t rh;
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relay_header_unpack(&rh, cell->payload);
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received_integrity = rh.integrity;
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rh.integrity = 0;
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relay_header_pack(cell->payload, &rh);
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received_integrity = CELL_RELAY_INTEGRITY(*cell);
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log_fn(LOG_DEBUG,"Reading digest of %u from relay cell.",received_integrity);
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SET_CELL_RELAY_INTEGRITY(*cell, 0);
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crypto_digest_add_bytes(digest, cell->payload, CELL_PAYLOAD_SIZE);
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crypto_digest_get_digest(digest, (char *)&calculated_integrity, 4);
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@ -346,15 +356,16 @@ int circuit_deliver_relay_cell(cell_t *cell, circuit_t *circ,
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assert(cell && circ);
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assert(cell_direction == CELL_DIRECTION_OUT || cell_direction == CELL_DIRECTION_IN);
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log_fn(LOG_DEBUG,"direction %d, streamid %d before crypt.", cell_direction, *(int*)(cell->payload+1));
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log_fn(LOG_DEBUG,"direction %d, stream_id %d before crypt.", cell_direction, *(uint16_t*)(cell->payload+1));/*XXX*/
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if(relay_crypt(circ, cell->payload, CELL_PAYLOAD_SIZE, cell_direction,
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&layer_hint, &recognized, &conn) < 0) {
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if(relay_crypt(circ, cell->payload, cell_direction,
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&layer_hint, &recognized) < 0) {
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log_fn(LOG_WARN,"relay crypt failed. Dropping connection.");
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return -1;
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}
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if(recognized) {
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conn = relay_lookup_conn(circ, cell, cell_direction);
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if(cell_direction == CELL_DIRECTION_OUT) {
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if(relay_check_digest(circ->n_digest, cell) < 0) {
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log_fn(LOG_WARN,"outgoing cell failed integrity check. Closing circ.");
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@ -400,14 +411,14 @@ int circuit_deliver_relay_cell(cell_t *cell, circuit_t *circ,
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return 0;
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}
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int relay_crypt(circuit_t *circ, char *in, int inlen, char cell_direction,
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crypt_path_t **layer_hint, char *recognized, connection_t **conn) {
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static int relay_crypt(circuit_t *circ, char *in, char cell_direction,
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crypt_path_t **layer_hint, char *recognized) {
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crypt_path_t *thishop;
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char out[CELL_NETWORK_SIZE];
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char out[CELL_PAYLOAD_SIZE]; /* 'in' must be this size too */
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relay_header_t rh;
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assert(circ && in && recognized && conn);
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assert(inlen < CELL_NETWORK_SIZE);
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assert(circ && in && recognized);
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assert(cell_direction == CELL_DIRECTION_IN || cell_direction == CELL_DIRECTION_OUT);
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if(cell_direction == CELL_DIRECTION_IN) {
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if(circ->cpath) { /* we're at the beginning of the circuit.
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@ -420,16 +431,17 @@ int relay_crypt(circuit_t *circ, char *in, int inlen, char cell_direction,
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do { /* Remember: cpath is in forward order, that is, first hop first. */
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assert(thishop);
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log_fn(LOG_DEBUG,"before decrypt: %d",*(int*)(in+1));
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log_fn(LOG_DEBUG,"before decrypt: %d",*(uint16_t*)(in+1));
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/* decrypt */
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if(crypto_cipher_decrypt(thishop->b_crypto, in, inlen, out)) {
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if(crypto_cipher_decrypt(thishop->b_crypto, in, CELL_PAYLOAD_SIZE, out)) {
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log_fn(LOG_WARN,"Error performing onion decryption: %s", crypto_perror());
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return -1;
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}
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memcpy(in,out,inlen);
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log_fn(LOG_DEBUG,"after decrypt: %d",*(int*)(in+1));
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memcpy(in,out,CELL_PAYLOAD_SIZE);
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log_fn(LOG_DEBUG,"after decrypt: %d",*(uint16_t*)(in+1));
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if( (*recognized = relay_check_recognized(circ, cell_direction, in+1, conn))) {
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if(*(uint16_t*)(in+1) == 0) { /* XXX */
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*recognized = 1;
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*layer_hint = thishop;
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return 0;
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}
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@ -440,20 +452,19 @@ int relay_crypt(circuit_t *circ, char *in, int inlen, char cell_direction,
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return 0;
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} else { /* we're in the middle. Just one crypt. */
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log_fn(LOG_DEBUG,"before encrypt: %d",*(int*)(in+1));
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if(crypto_cipher_encrypt(circ->p_crypto, in, inlen, out)) {
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log_fn(LOG_DEBUG,"before encrypt: %d",*(uint16_t*)(in+1));
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if(crypto_cipher_encrypt(circ->p_crypto, in, CELL_PAYLOAD_SIZE, out)) {
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log_fn(LOG_WARN,"Onion encryption failed for circID %u: %s",
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circ->p_circ_id, crypto_perror());
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return -1;
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}
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memcpy(in,out,inlen);
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log_fn(LOG_DEBUG,"after encrypt: %d",*(int*)(in+1));
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memcpy(in,out,CELL_PAYLOAD_SIZE);
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log_fn(LOG_DEBUG,"after encrypt: %d",*(uint16_t*)(in+1));
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log_fn(LOG_DEBUG,"Skipping recognized check, because we're not the OP.");
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/* don't check for recognized. only the OP can recognize a stream on the way back. */
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}
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} else if(cell_direction == CELL_DIRECTION_OUT) {
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} else /* cell_direction == CELL_DIRECTION_OUT */ {
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if(circ->cpath) { /* we're at the beginning of the circuit. We'll want to do layered crypts. */
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thishop = *layer_hint; /* we already know which layer, from when we package_raw_inbuf'ed */
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@ -461,69 +472,56 @@ int relay_crypt(circuit_t *circ, char *in, int inlen, char cell_direction,
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do {
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assert(thishop);
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log_fn(LOG_DEBUG,"before encrypt: %d",*(int*)(in+1));
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if(crypto_cipher_encrypt(thishop->f_crypto, in, inlen, out)) {
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log_fn(LOG_DEBUG,"before encrypt: %d",*(uint16_t*)(in+1));
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if(crypto_cipher_encrypt(thishop->f_crypto, in, CELL_PAYLOAD_SIZE, out)) {
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log_fn(LOG_WARN,"Error performing encryption: %s", crypto_perror());
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return -1;
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}
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memcpy(in,out,inlen);
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log_fn(LOG_DEBUG,"after encrypt: %d",*(int*)(in+1));
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memcpy(in,out,CELL_PAYLOAD_SIZE);
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log_fn(LOG_DEBUG,"after encrypt: %d",*(uint16_t*)(in+1));
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thishop = thishop->prev;
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} while(thishop != circ->cpath->prev);
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} else { /* we're in the middle. Just one crypt. */
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if(crypto_cipher_decrypt(circ->n_crypto,in, inlen, out)) {
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if(crypto_cipher_decrypt(circ->n_crypto,in, CELL_PAYLOAD_SIZE, out)) {
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log_fn(LOG_WARN,"Decryption failed for circID %u: %s",
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circ->n_circ_id, crypto_perror());
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return -1;
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}
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memcpy(in,out,inlen);
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memcpy(in,out,CELL_PAYLOAD_SIZE);
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if( (*recognized = relay_check_recognized(circ, cell_direction, in+1, conn)))
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if(*(uint16_t*)(in+1) == 0) { /* XXX */
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*recognized = 1;
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return 0;
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}
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}
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} else {
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log_fn(LOG_ERR,"unknown cell direction %d.", cell_direction);
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assert(0);
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}
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return 0;
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}
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int relay_check_recognized(circuit_t *circ, int cell_direction, char *stream, connection_t **conn) {
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/* FIXME can optimize by passing thishop in */
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static connection_t *relay_lookup_conn(circuit_t *circ, cell_t *cell, int cell_direction) {
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connection_t *tmpconn;
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relay_header_t rh;
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if(!memcmp(stream,ZERO_STREAM,STREAM_ID_SIZE)) {
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log_fn(LOG_DEBUG,"It's the zero stream. Recognized.");
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return 1; /* the zero stream is always recognized */
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}
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log_fn(LOG_DEBUG,"not the zero stream.");
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relay_header_unpack(&rh, cell->payload);
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if(!rh.stream_id)
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return NULL;
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if(cell_direction == CELL_DIRECTION_OUT)
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tmpconn = circ->n_streams;
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else
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tmpconn = circ->p_streams;
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if(!tmpconn) {
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log_fn(LOG_DEBUG,"No conns. Not recognized.");
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return 0;
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}
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for( ; tmpconn; tmpconn=tmpconn->next_stream) {
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if(!memcmp(stream,tmpconn->stream_id, STREAM_ID_SIZE)) {
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log_fn(LOG_DEBUG,"recognized stream %d.", *(int*)stream);
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*conn = tmpconn;
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return 1;
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if(rh.stream_id == tmpconn->stream_id) {
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log_fn(LOG_DEBUG,"found conn for stream %d.", rh.stream_id);
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return tmpconn;
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}
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log_fn(LOG_DEBUG,"considered stream %d, not it.",*(int*)tmpconn->stream_id);
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log_fn(LOG_DEBUG,"considered stream %d, not it.",tmpconn->stream_id);
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}
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log_fn(LOG_DEBUG,"Didn't recognize on this iteration of decryption.");
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return 0;
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return NULL; /* probably a begin relay cell */
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}
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void circuit_resume_edge_reading(circuit_t *circ, int edge_type, crypt_path_t *layer_hint) {
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@ -1060,7 +1058,7 @@ int circuit_truncated(circuit_t *circ, crypt_path_t *layer) {
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for(stream = circ->p_streams; stream; stream=stream->next_stream) {
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if(stream->cpath_layer == victim) {
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log_fn(LOG_INFO, "Marking stream %d for close.", *(int*)stream->stream_id);
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log_fn(LOG_INFO, "Marking stream %d for close.", stream->stream_id);
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/* no need to send 'end' relay cells,
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* because the other side's already dead
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*/
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@ -760,7 +760,7 @@ void assert_connection_ok(connection_t *conn, time_t now)
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}
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if (conn->type != CONN_TYPE_EXIT && conn->type != CONN_TYPE_AP) {
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assert(!conn->stream_id[0]);
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assert(!conn->stream_id);
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assert(!conn->next_stream);
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assert(!conn->cpath_layer);
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assert(!conn->package_window);
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@ -20,6 +20,22 @@ static void connection_edge_consider_sending_sendme(connection_t *conn);
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static uint32_t client_dns_lookup_entry(const char *address);
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static void client_dns_set_entry(const char *address, uint32_t val);
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void relay_header_pack(char *dest, const relay_header_t *src) {
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*(uint8_t*)(dest) = src->command;
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*(uint16_t*)(dest+1) = htons(src->recognized);
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*(uint16_t*)(dest+3) = htons(src->stream_id);
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*(uint32_t*)(dest+5) = htonl(src->integrity);
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*(uint16_t*)(dest+9) = htons(src->length);
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}
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void relay_header_unpack(relay_header_t *dest, const char *src) {
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dest->command = *(uint8_t*)(src);
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dest->recognized = ntohs(*(uint16_t*)(src+1));
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dest->stream_id = ntohs(*(uint16_t*)(src+3));
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dest->integrity = ntohl(*(uint32_t*)(src+5));
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dest->length = ntohs(*(uint16_t*)(src+9));
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}
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int connection_edge_process_inbuf(connection_t *conn) {
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assert(conn);
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@ -127,18 +143,16 @@ int connection_edge_end(connection_t *conn, char reason, crypt_path_t *cpath_lay
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int connection_edge_send_command(connection_t *fromconn, circuit_t *circ, int relay_command,
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void *payload, int payload_len, crypt_path_t *cpath_layer) {
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cell_t cell;
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relay_header_t rh;
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int cell_direction;
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int is_control_cell=0;
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if(!circ) {
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log_fn(LOG_WARN,"no circ. Closing.");
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return -1;
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}
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if(!fromconn || relay_command == RELAY_COMMAND_BEGIN) /* XXX more */
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is_control_cell = 1;
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memset(&cell, 0, sizeof(cell_t));
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cell.command = CELL_RELAY;
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// if(fromconn && fromconn->type == CONN_TYPE_AP) {
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if(cpath_layer) {
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cell.circ_id = circ->n_circ_id;
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@ -148,17 +162,14 @@ int connection_edge_send_command(connection_t *fromconn, circuit_t *circ, int re
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cell_direction = CELL_DIRECTION_IN;
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}
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cell.command = CELL_RELAY;
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SET_CELL_RELAY_COMMAND(cell, relay_command);
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if(is_control_cell)
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SET_CELL_STREAM_ID(cell, ZERO_STREAM);
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else
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SET_CELL_STREAM_ID(cell, fromconn->stream_id);
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SET_CELL_RELAY_LENGTH(cell, payload_len);
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if(payload_len) {
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memcpy(cell.payload+RELAY_HEADER_SIZE,payload,payload_len);
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}
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memset(&rh, 0, sizeof(rh));
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rh.command = relay_command;
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if(fromconn)
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rh.stream_id = fromconn->stream_id; /* else it's 0 */
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rh.length = payload_len;
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relay_header_pack(cell.payload, &rh);
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if(payload_len)
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memcpy(cell.payload+RELAY_HEADER_SIZE, payload, payload_len);
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if(cell_direction == CELL_DIRECTION_OUT) /* AP */
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relay_set_digest(cpath_layer->f_digest, &cell);
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@ -180,14 +191,14 @@ int connection_edge_send_command(connection_t *fromconn, circuit_t *circ, int re
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* circuit, else 0. */
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int connection_edge_process_relay_cell(cell_t *cell, circuit_t *circ, connection_t *conn,
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int edge_type, crypt_path_t *layer_hint) {
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int relay_command;
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static int num_seen=0;
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uint32_t addr;
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relay_header_t rh;
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assert(cell && circ);
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relay_command = CELL_RELAY_COMMAND(*cell);
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// log_fn(LOG_DEBUG,"command %d stream %d", relay_command, stream_id);
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relay_header_unpack(&rh, cell->payload);
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// log_fn(LOG_DEBUG,"command %d stream %d", rh.command, rh.stream_id);
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num_seen++;
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log_fn(LOG_DEBUG,"Now seen %d relay cells here.", num_seen);
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@ -195,9 +206,9 @@ int connection_edge_process_relay_cell(cell_t *cell, circuit_t *circ, connection
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* conn points to the recognized stream. */
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if(conn && conn->state != AP_CONN_STATE_OPEN && conn->state != EXIT_CONN_STATE_OPEN) {
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if(conn->type == CONN_TYPE_EXIT && relay_command == RELAY_COMMAND_END) {
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if(conn->type == CONN_TYPE_EXIT && rh.command == RELAY_COMMAND_END) {
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log_fn(LOG_INFO,"Exit got end (%s) before we're connected. Marking for close.",
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connection_edge_end_reason(cell->payload+RELAY_HEADER_SIZE, CELL_RELAY_LENGTH(*cell)));
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connection_edge_end_reason(cell->payload+RELAY_HEADER_SIZE, rh.length));
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if(conn->state == EXIT_CONN_STATE_RESOLVING) {
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log_fn(LOG_INFO,"...and informing resolver we don't want the answer anymore.");
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dns_cancel_pending_resolve(conn->address, conn);
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@ -207,14 +218,14 @@ int connection_edge_process_relay_cell(cell_t *cell, circuit_t *circ, connection
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return 0;
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} else {
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log_fn(LOG_WARN,"Got an unexpected relay command %d, in state %d (%s). Closing.",
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relay_command, conn->state, conn_state_to_string[conn->type][conn->state]);
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rh.command, conn->state, conn_state_to_string[conn->type][conn->state]);
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if(connection_edge_end(conn, END_STREAM_REASON_MISC, conn->cpath_layer) < 0)
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log_fn(LOG_WARN,"1: I called connection_edge_end redundantly.");
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return -1;
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}
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}
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switch(relay_command) {
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switch(rh.command) {
|
||||
case RELAY_COMMAND_BEGIN:
|
||||
if(edge_type == EDGE_AP) {
|
||||
log_fn(LOG_WARN,"relay begin request unsupported at AP. Dropping.");
|
||||
@ -235,12 +246,13 @@ int connection_edge_process_relay_cell(cell_t *cell, circuit_t *circ, connection
|
||||
log_fn(LOG_WARN,"2: I called connection_edge_end redundantly.");
|
||||
return -1;
|
||||
}
|
||||
log_fn(LOG_DEBUG,"circ deliver_window now %d.", edge_type == EDGE_AP ? layer_hint->deliver_window : circ->deliver_window);
|
||||
log_fn(LOG_DEBUG,"circ deliver_window now %d.", edge_type == EDGE_AP ?
|
||||
layer_hint->deliver_window : circ->deliver_window);
|
||||
|
||||
circuit_consider_sending_sendme(circ, edge_type, layer_hint);
|
||||
|
||||
if(!conn) {
|
||||
log_fn(LOG_INFO,"relay cell dropped, unknown stream %d.",*(int*)conn->stream_id);
|
||||
log_fn(LOG_INFO,"data cell dropped, unknown stream.");
|
||||
return 0;
|
||||
}
|
||||
|
||||
@ -249,19 +261,18 @@ int connection_edge_process_relay_cell(cell_t *cell, circuit_t *circ, connection
|
||||
return -1; /* somebody's breaking protocol. kill the whole circuit. */
|
||||
}
|
||||
|
||||
stats_n_data_bytes_received += CELL_RELAY_LENGTH(*cell);
|
||||
stats_n_data_bytes_received += rh.length;
|
||||
connection_write_to_buf(cell->payload + RELAY_HEADER_SIZE,
|
||||
CELL_RELAY_LENGTH(*cell), conn);
|
||||
rh.length, conn);
|
||||
connection_edge_consider_sending_sendme(conn);
|
||||
return 0;
|
||||
case RELAY_COMMAND_END:
|
||||
if(!conn) {
|
||||
log_fn(LOG_INFO,"end cell (%s) dropped, unknown stream %d.",
|
||||
connection_edge_end_reason(cell->payload+RELAY_HEADER_SIZE, CELL_RELAY_LENGTH(*cell)),
|
||||
*(int*)conn->stream_id);
|
||||
log_fn(LOG_INFO,"end cell (%s) dropped, unknown stream.",
|
||||
connection_edge_end_reason(cell->payload+RELAY_HEADER_SIZE, rh.length));
|
||||
return 0;
|
||||
}
|
||||
if(CELL_RELAY_LENGTH(*cell) >= 5 &&
|
||||
if(rh.length >= 5 &&
|
||||
*(cell->payload+RELAY_HEADER_SIZE) == END_STREAM_REASON_EXITPOLICY) {
|
||||
/* No need to close the connection. We'll hold it open while
|
||||
* we try a new exit node.
|
||||
@ -282,8 +293,8 @@ int connection_edge_process_relay_cell(cell_t *cell, circuit_t *circ, connection
|
||||
}
|
||||
}
|
||||
log_fn(LOG_INFO,"end cell (%s) for stream %d. Removing stream.",
|
||||
connection_edge_end_reason(cell->payload+RELAY_HEADER_SIZE, CELL_RELAY_LENGTH(*cell)),
|
||||
*(int*)conn->stream_id);
|
||||
connection_edge_end_reason(cell->payload+RELAY_HEADER_SIZE, rh.length),
|
||||
conn->stream_id);
|
||||
|
||||
#ifdef HALF_OPEN
|
||||
conn->done_sending = 1;
|
||||
@ -344,11 +355,11 @@ int connection_edge_process_relay_cell(cell_t *cell, circuit_t *circ, connection
|
||||
return 0;
|
||||
}
|
||||
if(!conn) {
|
||||
log_fn(LOG_INFO,"connected cell dropped, unknown stream %d.",*(int*)conn->stream_id);
|
||||
log_fn(LOG_INFO,"connected cell dropped, unknown stream.");
|
||||
return 0;
|
||||
}
|
||||
log_fn(LOG_INFO,"Connected! Notifying application.");
|
||||
if (CELL_RELAY_LENGTH(*cell) >= 4) {
|
||||
if (rh.length >= 4) {
|
||||
addr = ntohl(*(uint32_t*)(cell->payload + RELAY_HEADER_SIZE));
|
||||
client_dns_set_entry(conn->socks_request->address, addr);
|
||||
}
|
||||
@ -363,12 +374,14 @@ int connection_edge_process_relay_cell(cell_t *cell, circuit_t *circ, connection
|
||||
if(edge_type == EDGE_AP) {
|
||||
assert(layer_hint);
|
||||
layer_hint->package_window += CIRCWINDOW_INCREMENT;
|
||||
log_fn(LOG_DEBUG,"circ-level sendme at AP, packagewindow %d.", layer_hint->package_window);
|
||||
log_fn(LOG_DEBUG,"circ-level sendme at AP, packagewindow %d.",
|
||||
layer_hint->package_window);
|
||||
circuit_resume_edge_reading(circ, EDGE_AP, layer_hint);
|
||||
} else {
|
||||
assert(!layer_hint);
|
||||
circ->package_window += CIRCWINDOW_INCREMENT;
|
||||
log_fn(LOG_DEBUG,"circ-level sendme at exit, packagewindow %d.", circ->package_window);
|
||||
log_fn(LOG_DEBUG,"circ-level sendme at exit, packagewindow %d.",
|
||||
circ->package_window);
|
||||
circuit_resume_edge_reading(circ, EDGE_EXIT, layer_hint);
|
||||
}
|
||||
return 0;
|
||||
@ -378,11 +391,8 @@ int connection_edge_process_relay_cell(cell_t *cell, circuit_t *circ, connection
|
||||
connection_start_reading(conn);
|
||||
connection_edge_package_raw_inbuf(conn); /* handle whatever might still be on the inbuf */
|
||||
return 0;
|
||||
default:
|
||||
log_fn(LOG_WARN,"unknown relay command %d.",relay_command);
|
||||
return -1;
|
||||
}
|
||||
assert(0);
|
||||
log_fn(LOG_WARN,"unknown relay command %d.",rh.command);
|
||||
return -1;
|
||||
}
|
||||
|
||||
@ -667,20 +677,19 @@ static void connection_ap_handshake_send_begin(connection_t *ap_conn, circuit_t
|
||||
assert(ap_conn->state == AP_CONN_STATE_CIRCUIT_WAIT);
|
||||
assert(ap_conn->socks_request);
|
||||
|
||||
crypto_pseudo_rand(STREAM_ID_SIZE, ap_conn->stream_id);
|
||||
/* FIXME check for collisions */
|
||||
crypto_pseudo_rand(sizeof(ap_conn->stream_id), (unsigned char*) &ap_conn->stream_id);
|
||||
/* XXX check for collisions */
|
||||
|
||||
in.s_addr = htonl(client_dns_lookup_entry(ap_conn->socks_request->address));
|
||||
string_addr = in.s_addr ? inet_ntoa(in) : NULL;
|
||||
|
||||
memcpy(payload, ap_conn->stream_id, STREAM_ID_SIZE);
|
||||
payload_len = STREAM_ID_SIZE + 1 +
|
||||
snprintf(payload+STREAM_ID_SIZE,CELL_PAYLOAD_SIZE-RELAY_HEADER_SIZE-STREAM_ID_SIZE,
|
||||
"%s:%d",
|
||||
string_addr ? string_addr : ap_conn->socks_request->address,
|
||||
ap_conn->socks_request->port);
|
||||
snprintf(payload,RELAY_PAYLOAD_SIZE,
|
||||
"%s:%d",
|
||||
string_addr ? string_addr : ap_conn->socks_request->address,
|
||||
ap_conn->socks_request->port);
|
||||
payload_len = strlen(payload)+1;
|
||||
|
||||
log_fn(LOG_DEBUG,"Sending relay cell to begin stream %d.",*(int *)ap_conn->stream_id);
|
||||
log_fn(LOG_DEBUG,"Sending relay cell to begin stream %d.",ap_conn->stream_id);
|
||||
|
||||
if(connection_edge_send_command(ap_conn, circ, RELAY_COMMAND_BEGIN,
|
||||
payload, payload_len, ap_conn->cpath_layer) < 0)
|
||||
@ -734,18 +743,20 @@ static int connection_ap_handshake_socks_reply(connection_t *conn, char *reply,
|
||||
|
||||
static int connection_exit_begin_conn(cell_t *cell, circuit_t *circ) {
|
||||
connection_t *n_stream;
|
||||
relay_header_t rh;
|
||||
char *colon;
|
||||
|
||||
relay_header_unpack(&rh, cell->payload);
|
||||
|
||||
/* XXX currently we don't send an end cell back if we drop the
|
||||
* begin because it's malformed.
|
||||
*/
|
||||
|
||||
if(!memchr(cell->payload+RELAY_HEADER_SIZE+STREAM_ID_SIZE,0,
|
||||
CELL_RELAY_LENGTH(*cell)-STREAM_ID_SIZE)) {
|
||||
if(!memchr(cell->payload+RELAY_HEADER_SIZE, 0, rh.length)) {
|
||||
log_fn(LOG_WARN,"relay begin cell has no \\0. Dropping.");
|
||||
return 0;
|
||||
}
|
||||
colon = strchr(cell->payload+RELAY_HEADER_SIZE+STREAM_ID_SIZE, ':');
|
||||
colon = strchr(cell->payload+RELAY_HEADER_SIZE, ':');
|
||||
if(!colon) {
|
||||
log_fn(LOG_WARN,"relay begin cell has no colon. Dropping.");
|
||||
return 0;
|
||||
@ -760,8 +771,8 @@ static int connection_exit_begin_conn(cell_t *cell, circuit_t *circ) {
|
||||
log_fn(LOG_DEBUG,"Creating new exit connection.");
|
||||
n_stream = connection_new(CONN_TYPE_EXIT);
|
||||
|
||||
memcpy(n_stream->stream_id, cell->payload + RELAY_HEADER_SIZE, STREAM_ID_SIZE);
|
||||
n_stream->address = tor_strdup(cell->payload + RELAY_HEADER_SIZE + STREAM_ID_SIZE);
|
||||
n_stream->stream_id = rh.stream_id;
|
||||
n_stream->address = tor_strdup(cell->payload + RELAY_HEADER_SIZE);
|
||||
n_stream->port = atoi(colon+1);
|
||||
n_stream->state = EXIT_CONN_STATE_RESOLVING;
|
||||
/* leave n_stream->s at -1, because it's not yet valid */
|
||||
|
||||
45
src/or/or.h
45
src/or/or.h
@ -235,36 +235,45 @@ typedef uint16_t circ_id_t;
|
||||
/*
|
||||
* Relay payload:
|
||||
* Relay command [1 byte]
|
||||
* Stream ID [7 bytes]
|
||||
* Recognized [2 bytes]
|
||||
* Stream ID [2 bytes]
|
||||
* Partial SHA-1 [4 bytes]
|
||||
* Length [2 bytes]
|
||||
* Relay payload [495 bytes]
|
||||
* Relay payload [498 bytes]
|
||||
*/
|
||||
|
||||
#if 0
|
||||
#define CELL_RELAY_COMMAND(c) (*(uint8_t*)((c).payload))
|
||||
#define SET_CELL_RELAY_COMMAND(c,cmd) (*(uint8_t*)((c).payload) = (cmd))
|
||||
|
||||
#define STREAM_ID_SIZE 7
|
||||
#define SET_CELL_STREAM_ID(c,id) memcpy((c).payload+1,(id),STREAM_ID_SIZE)
|
||||
#define ZERO_STREAM "\0\0\0\0\0\0\0"
|
||||
#define CELL_RELAY_RECOGNIZED(c) (ntohs(*(uint16_t*)((c).payload+1)))
|
||||
#define SET_CELL_RELAY_RECOGNIZED(c,r) (*(uint16_t*)((c).payload+1) = htons(r))
|
||||
|
||||
#define CELL_RELAY_COMMAND_END_REASON(c) (*(uint8_t)((c).payload+1))
|
||||
#define STREAM_ID_SIZE 2
|
||||
//#define SET_CELL_STREAM_ID(c,id) memcpy((c).payload+1,(id),STREAM_ID_SIZE)
|
||||
#define CELL_RELAY_STREAM_ID(c) (ntohs(*(uint16_t*)((c).payload+3)))
|
||||
#define SET_CELL_RELAY_STREAM_ID(c,id) (*(uint16_t*)((c).payload+3) = htons(id))
|
||||
#define ZERO_STREAM 0
|
||||
|
||||
/* integrity is the first 32 bits (in network order) of a sha-1 of all
|
||||
* cell payloads that are relay cells that have been sent / delivered
|
||||
* to the hop on the * circuit (the integrity is zeroed while doing
|
||||
* each calculation)
|
||||
*/
|
||||
#define CELL_RELAY_INTEGRITY(c) (ntohl(*(uint32_t*)((c).payload+1+STREAM_ID_SIZE)))
|
||||
#define SET_CELL_RELAY_INTEGRITY(c,i) (*(uint32_t*)((c).payload+1+STREAM_ID_SIZE) = htonl(i))
|
||||
#define CELL_RELAY_INTEGRITY(c) (ntohl(*(uint32_t*)((c).payload+5)))
|
||||
#define SET_CELL_RELAY_INTEGRITY(c,i) (*(uint32_t*)((c).payload+5) = htonl(i))
|
||||
|
||||
/* relay length is how many bytes are used in the cell payload past relay_header_size */
|
||||
#define CELL_RELAY_LENGTH(c) (ntohs(*(uint16_t*)((c).payload+1+STREAM_ID_SIZE+4)))
|
||||
#define SET_CELL_RELAY_LENGTH(c,len) (*(uint16_t*)((c).payload+1+STREAM_ID_SIZE+4) = htons(len))
|
||||
#define CELL_RELAY_LENGTH(c) (ntohs(*(uint16_t*)((c).payload+9)))
|
||||
#define SET_CELL_RELAY_LENGTH(c,len) (*(uint16_t*)((c).payload+9) = htons(len))
|
||||
#endif
|
||||
|
||||
#define CELL_PAYLOAD_SIZE 509
|
||||
#define CELL_NETWORK_SIZE 512
|
||||
|
||||
#define RELAY_HEADER_SIZE (1+2+2+4+2)
|
||||
#define RELAY_PAYLOAD_SIZE (CELL_PAYLOAD_SIZE-RELAY_HEADER_SIZE)
|
||||
|
||||
/* cell definition */
|
||||
typedef struct {
|
||||
circ_id_t circ_id;
|
||||
@ -272,8 +281,13 @@ typedef struct {
|
||||
unsigned char payload[CELL_PAYLOAD_SIZE];
|
||||
} cell_t;
|
||||
|
||||
#define RELAY_HEADER_SIZE (1+STREAM_ID_SIZE+4+2)
|
||||
#define RELAY_PAYLOAD_SIZE (CELL_PAYLOAD_SIZE-RELAY_HEADER_SIZE)
|
||||
typedef struct {
|
||||
uint8_t command;
|
||||
uint16_t recognized;
|
||||
uint16_t stream_id;
|
||||
uint32_t integrity;
|
||||
uint16_t length;
|
||||
} relay_header_t;
|
||||
|
||||
typedef struct buf_t buf_t;
|
||||
typedef struct socks_request_t socks_request_t;
|
||||
@ -327,7 +341,7 @@ struct connection_t {
|
||||
*/
|
||||
|
||||
/* Used only by edge connections: */
|
||||
char stream_id[STREAM_ID_SIZE];
|
||||
uint16_t stream_id;
|
||||
struct connection_t *next_stream; /* points to the next stream at this edge, if any */
|
||||
struct crypt_path_t *cpath_layer; /* a pointer to which node in the circ this conn exits at */
|
||||
int package_window; /* how many more relay cells can i send into the circuit? */
|
||||
@ -556,9 +570,6 @@ void relay_set_digest(crypto_digest_env_t *digest, cell_t *cell);
|
||||
int relay_check_digest(crypto_digest_env_t *digest, cell_t *cell);
|
||||
int circuit_deliver_relay_cell(cell_t *cell, circuit_t *circ,
|
||||
int cell_direction, crypt_path_t *layer_hint);
|
||||
int relay_crypt(circuit_t *circ, char *in, int inlen, char cell_direction,
|
||||
crypt_path_t **layer_hint, char *recognized, connection_t **conn);
|
||||
int relay_check_recognized(circuit_t *circ, int cell_direction, char *stream, connection_t **conn);
|
||||
|
||||
void circuit_resume_edge_reading(circuit_t *circ, int edge_type, crypt_path_t *layer_hint);
|
||||
int circuit_consider_stop_edge_reading(circuit_t *circ, int edge_type, crypt_path_t *layer_hint);
|
||||
@ -648,6 +659,8 @@ void assert_connection_ok(connection_t *conn, time_t now);
|
||||
|
||||
/********************************* connection_edge.c ***************************/
|
||||
|
||||
void relay_header_pack(char *dest, const relay_header_t *src);
|
||||
void relay_header_unpack(relay_header_t *dest, const char *src);
|
||||
int connection_edge_process_inbuf(connection_t *conn);
|
||||
int connection_edge_end(connection_t *conn, char reason, crypt_path_t *cpath_layer);
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user