tor/src/or/or.h

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/* Copyright 2001,2002 Roger Dingledine, Matej Pfajfar. */
/* See LICENSE for licensing information */
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/* $Id$ */
#ifndef __OR_H
#define __OR_H
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#include "orconfig.h"
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#include <stdio.h>
#include <stdlib.h>
#include <limits.h>
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#include <unistd.h>
#include <string.h>
#include <signal.h>
#include <netdb.h>
#include <ctype.h>
#ifdef HAVE_STDINT_H
#include <stdint.h>
#endif
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#ifdef HAVE_SYS_POLL_H
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#include <sys/poll.h>
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#elif HAVE_POLL_H
#include <poll.h>
#else
#include "../common/fakepoll.h"
#endif
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#include <sys/types.h>
#include <sys/fcntl.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <sys/stat.h>
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#include <netinet/in.h>
#include <arpa/inet.h>
#include <errno.h>
#include <assert.h>
#include <time.h>
#ifdef USE_ZLIB
#include <zlib.h>
#endif
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#include "../common/crypto.h"
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#include "../common/log.h"
#include "../common/ss.h"
#include "../common/version.h"
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#define MAXCONNECTIONS 1000 /* upper bound on max connections.
can be lowered by config file */
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#define MAX_BUF_SIZE (640*1024)
#define DEFAULT_BANDWIDTH_OP (1024 * 1000)
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#define ACI_TYPE_LOWER 0
#define ACI_TYPE_HIGHER 1
#define ACI_TYPE_BOTH 2
/* bitvector of the roles that we might want to play. You can or (|) them together */
#define ROLE_OR_LISTEN 1
#define ROLE_OR_CONNECT_ALL 2
#define ROLE_OP_LISTEN 4
#define ROLE_AP_LISTEN 8
#define ROLE_DIR_LISTEN 16
#define ROLE_DIR_SERVER 32
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#define ROLE_IS_OR(role) ((role & ROLE_OR_LISTEN) || (role & ROLE_OR_CONNECT_ALL) || (role & ROLE_OP_LISTEN))
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#define CONN_TYPE_OP_LISTENER 1
#define CONN_TYPE_OP 2
#define CONN_TYPE_OR_LISTENER 3
#define CONN_TYPE_OR 4
#define CONN_TYPE_EXIT 5
#define CONN_TYPE_AP_LISTENER 6
#define CONN_TYPE_AP 7
#define CONN_TYPE_DIR_LISTENER 8
#define CONN_TYPE_DIR 9
#define CONN_TYPE_DNSMASTER 10
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#define LISTENER_STATE_READY 0
#define DNSMASTER_STATE_OPEN 0
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#define OP_CONN_STATE_AWAITING_KEYS 0
#define OP_CONN_STATE_OPEN 1
#if 0
#define OP_CONN_STATE_CLOSE 2 /* flushing the buffer, then will close */
#define OP_CONN_STATE_CLOSE_WAIT 3 /* have sent a destroy, awaiting a confirmation */
#endif
/* how to read these states:
* foo_CONN_STATE_bar_baz:
* "I am acting as a bar, currently in stage baz of talking with a foo."
*/
#define OR_CONN_STATE_OP_CONNECTING 0 /* an application proxy wants me to connect to this OR */
#define OR_CONN_STATE_OP_SENDING_KEYS 1
#define OR_CONN_STATE_CLIENT_CONNECTING 2 /* I'm connecting to this OR as an OR */
#define OR_CONN_STATE_CLIENT_SENDING_AUTH 3 /* sending address and info */
#define OR_CONN_STATE_CLIENT_AUTH_WAIT 4 /* have sent address and info, waiting */
#define OR_CONN_STATE_CLIENT_SENDING_NONCE 5 /* sending nonce, last piece of handshake */
#define OR_CONN_STATE_SERVER_AUTH_WAIT 6 /* waiting for address and info */
#define OR_CONN_STATE_SERVER_SENDING_AUTH 7 /* writing auth and nonce */
#define OR_CONN_STATE_SERVER_NONCE_WAIT 8 /* waiting for confirmation of nonce */
#define OR_CONN_STATE_OPEN 9 /* ready to send/receive cells. */
#define EXIT_CONN_STATE_RESOLVING 0 /* waiting for response from dnsmaster */
#define EXIT_CONN_STATE_CONNECTING 1 /* waiting for connect() to finish */
#define EXIT_CONN_STATE_OPEN 2
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#if 0
#define EXIT_CONN_STATE_CLOSE 3 /* flushing the buffer, then will close */
#define EXIT_CONN_STATE_CLOSE_WAIT 4 /* have sent a destroy, awaiting a confirmation */
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#endif
#define AP_CONN_STATE_SOCKS_WAIT 0
#define AP_CONN_STATE_OR_WAIT 1
#define AP_CONN_STATE_OPEN 2
#define DIR_CONN_STATE_CONNECTING 0
#define DIR_CONN_STATE_SENDING_COMMAND 1
#define DIR_CONN_STATE_READING 2
#define DIR_CONN_STATE_COMMAND_WAIT 3
#define DIR_CONN_STATE_WRITING 4
#define CIRCUIT_STATE_ONION_WAIT 0 /* receiving the onion */
#define CIRCUIT_STATE_ONION_PENDING 1 /* waiting to process the onion */
#define CIRCUIT_STATE_OR_WAIT 2 /* I'm at the beginning of the path, my firsthop is still connecting */
#define CIRCUIT_STATE_OPEN 3 /* onion processed, ready to send data along the connection */
//#define CIRCUIT_STATE_CLOSE_WAIT1 4 /* sent two "destroy" signals, waiting for acks */
//#define CIRCUIT_STATE_CLOSE_WAIT2 5 /* received one ack, waiting for one more
// (or if just one was sent, waiting for that one */
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//#define CIRCUIT_STATE_CLOSE 4 /* both acks received, connection is dead */ /* NOT USED */
#define TOPIC_COMMAND_BEGIN 1
#define TOPIC_COMMAND_DATA 2
#define TOPIC_COMMAND_END 3
#define TOPIC_COMMAND_CONNECTED 4
#define TOPIC_COMMAND_SENDME 5
#define TOPIC_HEADER_SIZE 4
#define TOPIC_STATE_RESOLVING
/* available cipher functions */
#define ONION_CIPHER_IDENTITY 0
#define ONION_CIPHER_DES 1
#define ONION_CIPHER_RC4 2
/* default cipher function */
#define ONION_DEFAULT_CIPHER ONION_CIPHER_DES
#define CELL_DIRECTION_IN 1
#define CELL_DIRECTION_OUT 2
#define EDGE_EXIT 3 /* make direction and edge values not overlap, to help catch bugs */
#define EDGE_AP 4
#define CIRCWINDOW_START 1000
#define CIRCWINDOW_INCREMENT 100
#define TOPICWINDOW_START 500
#define TOPICWINDOW_INCREMENT 50
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/* cell commands */
#define CELL_PADDING 0
#define CELL_CREATE 1
#define CELL_DATA 2
#define CELL_DESTROY 3
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#define CELL_SENDME 4
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#define CELL_PAYLOAD_SIZE 120
#define CELL_NETWORK_SIZE 128
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/* enumeration of types which option values can take */
#define CONFIG_TYPE_STRING 0
#define CONFIG_TYPE_CHAR 1
#define CONFIG_TYPE_INT 2
#define CONFIG_TYPE_LONG 3
#define CONFIG_TYPE_DOUBLE 4
#define CONFIG_TYPE_BOOL 5
#define CONFIG_LINE_MAXLEN 1024
/* legal characters in a filename */
#define CONFIG_LEGAL_FILENAME_CHARACTERS "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789.-_/"
struct config_line {
char *key;
char *value;
struct config_line *next;
};
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typedef uint16_t aci_t;
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/* cell definition */
typedef struct {
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aci_t aci; /* Anonymous Connection Identifier */
unsigned char command;
unsigned char length; /* of payload if data cell, else value of sendme */
uint32_t seq; /* sequence number */
unsigned char payload[120];
} cell_t;
#define SOCKS4_REQUEST_GRANTED 90
#define SOCKS4_REQUEST_REJECT 91
#define SOCKS4_REQUEST_IDENT_FAILED 92
#define SOCKS4_REQUEST_IDENT_CONFLICT 93
/* structure of a socks client operation */
typedef struct {
unsigned char version; /* socks version number */
unsigned char command; /* command code */
unsigned char destport[2]; /* destination port, network order */
unsigned char destip[4]; /* destination address */
/* userid follows, terminated by a NULL */
/* dest host follows, terminated by a NULL */
} socks4_t;
struct connection_t {
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/* Used by all types: */
unsigned char type;
int state;
int s; /* our socket */
int poll_index;
int marked_for_close;
char *inbuf;
int inbuflen;
int inbuf_datalen;
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int inbuf_reached_eof;
long timestamp_lastread;
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char *outbuf;
int outbuflen; /* how many bytes are allocated for the outbuf? */
int outbuf_flushlen; /* how much data should we try to flush from the outbuf? */
int outbuf_datalen; /* how much data is there total on the outbuf? */
long timestamp_lastwritten;
long timestamp_created;
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int onions_handled_this_second;
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/* used by OR and OP: */
uint32_t bandwidth; /* connection bandwidth */
int receiver_bucket; /* when this hits 0, stop receiving. Every second we
* add 'bandwidth' to this, capping it at 10*bandwidth.
*/
struct timeval send_timeval; /* for determining when to send the next cell */
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/* link encryption */
crypto_cipher_env_t *f_crypto;
crypto_cipher_env_t *b_crypto;
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// struct timeval lastsend; /* time of last transmission to the client */
// struct timeval interval; /* transmission interval */
uint32_t addr; /* these two uniquely identify a router. Both in host order. */
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uint16_t port;
/* used by exit and ap: */
uint16_t topic_id;
struct connection_t *next_topic;
int n_receive_topicwindow;
int p_receive_topicwindow;
int done_sending;
int done_receiving;
#ifdef USE_ZLIB
char *z_outbuf;
int z_outbuflen;
int z_outbuf_datalen;
z_stream *compression;
z_stream *decompression;
#endif
/* Used by ap: */
char socks_version;
char read_username;
/* Used by exit and ap: */
char *dest_addr;
uint16_t dest_port; /* host order */
/* Used by ap: */
char dest_tmp[512];
int dest_tmplen;
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/* Used by everyone */
char *address; /* strdup into this, because free_connection frees it */
/* Used for cell connections */
crypto_pk_env_t *pkey; /* public RSA key for the other side */
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/* Used while negotiating OR/OR connections */
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char nonce[8];
};
typedef struct connection_t connection_t;
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/* config stuff we know about the other ORs in the network */
typedef struct {
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char *address;
uint32_t addr; /* all host order */
uint16_t or_port;
uint16_t op_port;
uint16_t ap_port;
uint16_t dir_port;
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crypto_pk_env_t *pkey; /* public RSA key */
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/* link info */
uint32_t bandwidth;
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// struct timeval min_interval;
/* time when last data was sent to that router */
// struct timeval lastsend;
/* socket */
// int s;
void *next;
} routerinfo_t;
typedef struct {
unsigned int forwf;
unsigned int backf;
char digest2[20]; /* second SHA output for onion_layer_t.keyseed */
char digest3[20]; /* third SHA output for onion_layer_t.keyseed */
/* crypto environments */
crypto_cipher_env_t *f_crypto;
crypto_cipher_env_t *b_crypto;
} crypt_path_t;
struct data_queue_t {
cell_t *cell;
struct data_queue_t *next;
};
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/* per-anonymous-connection struct */
typedef struct {
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uint32_t n_addr;
uint16_t n_port;
connection_t *p_conn;
connection_t *n_conn;
int n_receive_circwindow;
int p_receive_circwindow;
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aci_t p_aci; /* connection identifiers */
aci_t n_aci;
struct data_queue_t *data_queue; /* for queueing cells at the edges */
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unsigned char p_f; /* crypto functions */
unsigned char n_f;
crypto_cipher_env_t *p_crypto; /* crypto environments */
crypto_cipher_env_t *n_crypto;
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crypt_path_t **cpath;
int cpathlen;
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uint32_t expire; /* expiration time for the corresponding onion */
int state;
unsigned char *onion; /* stores the onion when state is CONN_STATE_OPEN_WAIT */
uint32_t onionlen; /* total onion length */
uint32_t recvlen; /* length of the onion so far */
void *next;
} circuit_t;
struct onion_queue_t {
circuit_t *circ;
struct data_queue_t *data_cells;
struct onion_queue_t *next;
};
#if 0
typedef struct
{
int zero:1;
int version:7;
int backf:4;
int forwf:4;
uint16_t port;
uint32_t addr;
uint32_t expire;
unsigned char keyseed[16];
} onion_layer_t;
#endif
#define ONION_LAYER_SIZE 28
#define ONION_PADDING_SIZE (128-ONION_LAYER_SIZE)
typedef struct {
char *LogLevel;
char *RouterFile;
char *PrivateKeyFile;
double CoinWeight;
int Daemon;
int ORPort;
int OPPort;
int APPort;
int DirPort;
int MaxConn;
int TrafficShaping;
int LinkPadding;
int DirRebuildPeriod;
int DirFetchPeriod;
int KeepalivePeriod;
int MaxOnionsPending;
int Role;
int loglevel;
} or_options_t;
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/* all the function prototypes go here */
/********************************* buffers.c ***************************/
int buf_new(char **buf, int *buflen, int *buf_datalen);
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void buf_free(char *buf);
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int read_to_buf(int s, int at_most, char **buf, int *buflen, int *buf_datalen, int *reached_eof);
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/* grab from s, put onto buf, return how many bytes read */
int flush_buf(int s, char **buf, int *buflen, int *buf_flushlen, int *buf_datalen);
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/* push from buf onto s
* then memmove to front of buf
* return -1 or how many bytes remain on the buf */
int write_to_buf(char *string, int string_len,
char **buf, int *buflen, int *buf_datalen);
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/* append string to buf (growing as needed, return -1 if "too big")
* return total number of bytes on the buf
*/
int fetch_from_buf(char *string, int string_len,
char **buf, int *buflen, int *buf_datalen);
/* if there is string_len bytes in buf, write them onto string,
* then memmove buf back (that is, remove them from buf)
*/
#ifdef USE_ZLIB
int compress_from_buf(char *string, int string_len,
char **buf_in, int *buflen_in, int *buf_datalen_in,
z_stream *zstream, int flush);
/* read and compress as many characters as possible from buf, writing up to
* string_len of them onto string, then memmove buf back. Return number of
* characters written.
*/
int decompress_buf_to_buf(char **buf_in, int *buflen_in, int *buf_datalen_in,
char **buf_out, int *buflen_out, int *buf_datalen_out,
z_stream *zstream, int flush);
/* XXX document this NM
*/
#endif
int find_on_inbuf(char *string, int string_len,
char *buf, int buf_datalen);
/* find first instance of needle 'string' on haystack 'buf'. return how
* many bytes from the beginning of buf to the end of string.
* If it's not there, return -1.
*/
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/********************************* cell.c ***************************/
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int pack_create(uint16_t aci, unsigned char *onion, uint32_t onionlen, unsigned char **cellbuf, unsigned int *cellbuflen);
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/********************************* circuit.c ***************************/
void circuit_add(circuit_t *circ);
void circuit_remove(circuit_t *circ);
circuit_t *circuit_new(aci_t p_aci, connection_t *p_conn);
/* internal */
aci_t get_unique_aci_by_addr_port(uint32_t addr, uint16_t port, int aci_type);
circuit_t *circuit_get_by_aci_conn(aci_t aci, connection_t *conn);
circuit_t *circuit_get_by_conn(connection_t *conn);
circuit_t *circuit_get_by_edge_type(char edge_type);
circuit_t *circuit_enumerate_by_naddr_nport(circuit_t *start, uint32_t naddr, uint16_t nport);
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int circuit_deliver_data_cell_from_edge(cell_t *cell, circuit_t *circ, char edge_type);
int circuit_deliver_data_cell(cell_t *cell, circuit_t *circ, int crypt_type);
int circuit_crypt(circuit_t *circ, char *in, int inlen, char crypt_type);
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void circuit_resume_edge_reading(circuit_t *circ, int edge_type);
int circuit_consider_stop_edge_reading(circuit_t *circ, int edge_type);
int circuit_consider_sending_sendme(circuit_t *circ, int edge_type);
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int circuit_init(circuit_t *circ, int aci_type);
void circuit_free(circuit_t *circ);
void circuit_free_cpath(crypt_path_t **cpath, int cpathlen);
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void circuit_close(circuit_t *circ);
void circuit_about_to_close_connection(connection_t *conn);
/* flush and send destroys for all circuits using conn */
void circuit_dump_by_conn(connection_t *conn);
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/********************************* command.c ***************************/
void command_process_cell(cell_t *cell, connection_t *conn);
void command_process_create_cell(cell_t *cell, connection_t *conn);
void command_process_sendme_cell(cell_t *cell, connection_t *conn);
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void command_process_data_cell(cell_t *cell, connection_t *conn);
void command_process_destroy_cell(cell_t *cell, connection_t *conn);
void command_process_connected_cell(cell_t *cell, connection_t *conn);
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/********************************* config.c ***************************/
const char *basename(const char *filename);
/* open configuration file for reading */
FILE *config_open(const unsigned char *filename);
/* close configuration file */
int config_close(FILE *f);
struct config_line *config_get_commandlines(int argc, char **argv);
/* parse the config file and strdup into key/value strings. Return list.
* * * Warn and ignore mangled lines. */
struct config_line *config_get_lines(FILE *f);
void config_free_lines(struct config_line *front);
int config_compare(struct config_line *c, char *key, int type, void *arg);
void config_assign(or_options_t *options, struct config_line *list);
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/* return 0 if success, <0 if failure. */
int getconfig(int argc, char **argv, or_options_t *options);
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/********************************* connection.c ***************************/
int tv_cmp(struct timeval *a, struct timeval *b);
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connection_t *connection_new(int type);
void connection_free(connection_t *conn);
int connection_create_listener(struct sockaddr_in *bindaddr, int type);
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int connection_handle_listener_read(connection_t *conn, int new_type, int new_state);
/* start all connections that should be up but aren't */
int retry_all_connections(int role, uint16_t or_listenport,
uint16_t op_listenport, uint16_t ap_listenport, uint16_t dir_listenport);
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int connection_read_to_buf(connection_t *conn);
int connection_fetch_from_buf(char *string, int len, connection_t *conn);
#ifdef USE_ZLIB
int connection_compress_from_buf(char *string, int len, connection_t *conn,
int flush);
int connection_decompress_to_buf(char *string, int len, connection_t *conn,
int flush);
#endif
int connection_outbuf_too_full(connection_t *conn);
int connection_find_on_inbuf(char *string, int len, connection_t *conn);
int connection_wants_to_flush(connection_t *conn);
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int connection_flush_buf(connection_t *conn);
int connection_write_to_buf(char *string, int len, connection_t *conn);
void connection_send_cell(connection_t *conn);
int connection_receiver_bucket_should_increase(connection_t *conn);
void connection_increment_receiver_bucket (connection_t *conn);
void connection_increment_send_timeval(connection_t *conn);
void connection_init_timeval(connection_t *conn);
int connection_speaks_cells(connection_t *conn);
int connection_is_listener(connection_t *conn);
int connection_state_is_open(connection_t *conn);
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int connection_send_destroy(aci_t aci, connection_t *conn);
int connection_send_connected(aci_t aci, connection_t *conn);
int connection_encrypt_cell(char *cellp, connection_t *conn);
int connection_write_cell_to_buf(const cell_t *cellp, connection_t *conn);
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int connection_process_inbuf(connection_t *conn);
int connection_package_raw_inbuf(connection_t *conn);
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int connection_process_cell_from_inbuf(connection_t *conn);
int connection_consider_sending_sendme(connection_t *conn, int edge_type);
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int connection_finished_flushing(connection_t *conn);
/********************************* connection_ap.c ****************************/
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int connection_ap_process_inbuf(connection_t *conn);
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int ap_handshake_process_socks(connection_t *conn);
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int ap_handshake_create_onion(connection_t *conn);
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int ap_handshake_establish_circuit(connection_t *conn, unsigned int *route, int routelen, char *onion,
int onionlen, crypt_path_t **cpath);
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void ap_handshake_n_conn_open(connection_t *or_conn);
int ap_handshake_send_onion(connection_t *ap_conn, connection_t *or_conn, circuit_t *circ);
int ap_handshake_send_begin(connection_t *ap_conn, circuit_t *circ);
int ap_handshake_socks_reply(connection_t *conn, char result);
int connection_ap_send_connected(connection_t *conn);
int connection_ap_process_data_cell(cell_t *cell, circuit_t *circ);
int connection_ap_finished_flushing(connection_t *conn);
int connection_ap_create_listener(struct sockaddr_in *bindaddr);
int connection_ap_handle_listener_read(connection_t *conn);
/********************************* connection_exit.c ***************************/
int connection_exit_process_inbuf(connection_t *conn);
int connection_exit_package_inbuf(connection_t *conn);
int connection_exit_send_connected(connection_t *conn);
int connection_exit_process_data_cell(cell_t *cell, circuit_t *circ);
int connection_exit_finished_flushing(connection_t *conn);
int connection_exit_connect(connection_t *conn);
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/********************************* connection_op.c ***************************/
int op_handshake_process_keys(connection_t *conn);
int connection_op_process_inbuf(connection_t *conn);
int connection_op_finished_flushing(connection_t *conn);
int connection_op_create_listener(struct sockaddr_in *bindaddr);
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int connection_op_handle_listener_read(connection_t *conn);
/********************************* connection_or.c ***************************/
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int connection_or_process_inbuf(connection_t *conn);
int connection_or_finished_flushing(connection_t *conn);
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void conn_or_init_crypto(connection_t *conn);
int or_handshake_op_send_keys(connection_t *conn);
int or_handshake_op_finished_sending_keys(connection_t *conn);
int or_handshake_client_process_auth(connection_t *conn);
int or_handshake_client_send_auth(connection_t *conn);
int or_handshake_server_process_auth(connection_t *conn);
int or_handshake_server_process_nonce(connection_t *conn);
connection_t *connect_to_router_as_or(routerinfo_t *router);
connection_t *connection_or_connect_as_or(routerinfo_t *router);
connection_t *connection_or_connect_as_op(routerinfo_t *router);
int connection_or_create_listener(struct sockaddr_in *bindaddr);
int connection_or_handle_listener_read(connection_t *conn);
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/********************************* directory.c ***************************/
void directory_initiate_fetch(routerinfo_t *router);
int directory_send_command(connection_t *conn);
void directory_set_dirty(void);
void directory_rebuild(void);
int connection_dir_process_inbuf(connection_t *conn);
int directory_handle_command(connection_t *conn);
int directory_handle_reading(connection_t *conn);
int connection_dir_finished_flushing(connection_t *conn);
int connection_dir_create_listener(struct sockaddr_in *bindaddr);
int connection_dir_handle_listener_read(connection_t *conn);
/********************************* dns.c ***************************/
int connection_dns_finished_flushing(connection_t *conn);
int connection_dns_process_inbuf(connection_t *conn);
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void init_cache_tree(void);
int dns_resolve(connection_t *exitconn);
int dns_master_start(void);
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/********************************* main.c ***************************/
void setprivatekey(crypto_pk_env_t *k);
crypto_pk_env_t *getprivatekey(void);
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int connection_add(connection_t *conn);
int connection_remove(connection_t *conn);
void connection_set_poll_socket(connection_t *conn);
connection_t *connection_twin_get_by_addr_port(uint32_t addr, uint16_t port);
connection_t *connection_exact_get_by_addr_port(uint32_t addr, uint16_t port);
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connection_t *connection_get_by_type(int type);
void connection_watch_events(connection_t *conn, short events);
void connection_stop_reading(connection_t *conn);
void connection_start_reading(connection_t *conn);
void connection_stop_writing(connection_t *conn);
void connection_start_writing(connection_t *conn);
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void check_conn_read(int i);
void check_conn_marked(int i);
void check_conn_write(int i);
int prepare_for_poll(int *timeout);
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int do_main_loop(void);
void dumpstats(void);
void dump_directory_to_string(char *s, int maxlen);
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int main(int argc, char *argv[]);
/********************************* onion.c ***************************/
int decide_aci_type(uint32_t local_addr, uint16_t local_port,
uint32_t remote_addr, uint16_t remote_port);
int onion_pending_add(circuit_t *circ);
int onion_pending_check(void);
void onion_pending_process_one(void);
void onion_pending_remove(circuit_t *circ);
struct data_queue_t *data_queue_add(struct data_queue_t *list, cell_t *cell);
void onion_pending_data_add(circuit_t *circ, cell_t *cell);
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/* uses a weighted coin with weight cw to choose a route length */
int chooselen(double cw);
/* returns an array of pointers to routent that define a new route through the OR network
* int cw is the coin weight to use when choosing the route
* order of routers is from last to first
*/
unsigned int *new_route(double cw, routerinfo_t **rarray, int rarray_len, int *routelen);
/* create a cipher by onion cipher type. */
crypto_cipher_env_t *create_onion_cipher(int cipher_type, char *key, char *iv, int encrypt_mode);
/* creates a new onion from route, stores it and its length into bufp and lenp respectively */
unsigned char *create_onion(routerinfo_t **rarray, int rarray_len, unsigned int *route, int routelen, int *len, crypt_path_t **cpath);
/* encrypts 128 bytes of the onion with the specified public key, the rest with
* DES OFB with the key as defined in the outter layer */
int encrypt_onion(unsigned char *onion, uint32_t onionlen, crypto_pk_env_t *pkey);
/* decrypts the first 128 bytes using RSA and prkey, decrypts the rest with DES OFB with key1 */
int decrypt_onion(unsigned char *onion, uint32_t onionlen, crypto_pk_env_t *prkey);
/* delete first n bytes of the onion and pads the end with n bytes of random data */
void pad_onion(unsigned char *onion, uint32_t onionlen, int n);
void init_tracked_tree(void);
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/********************************* routers.c ***************************/
int learn_my_address(struct sockaddr_in *me);
void router_retry_connections(void);
routerinfo_t *router_pick_directory_server(void);
routerinfo_t *router_get_by_addr_port(uint32_t addr, uint16_t port);
unsigned int *router_new_route(int *routelen);
unsigned char *router_create_onion(unsigned int *route, int routelen, int *len, crypt_path_t **cpath);
int router_is_me(uint32_t addr, uint16_t port);
routerinfo_t *router_get_first_in_route(unsigned int *route, int routelen);
void router_forget_router(uint32_t addr, uint16_t port);
int router_get_list_from_file(char *routerfile);
int router_get_list_from_string(char *s);
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#endif