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5d13db862e
tor/src/or/or.h
Roger Dingledine 5d13db862e entries in the dns cache now expire 
(expiry time set to 100 seconds so we can play with it)
exit connections are now informed when pending resolves fail
we kill off the oldest busy worker when we're under attack and need to
  resolve something new


svn:r356
2003-06-25 07:19:30 +00:00

755 lines
24 KiB
C
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/* Copyright 2001,2002 Roger Dingledine, Matej Pfajfar. */
/* See LICENSE for licensing information */
/* $Id$ */
#ifndef __OR_H
#define __OR_H
#include "orconfig.h"
#include <stdio.h>
#include <stdlib.h>
#include <limits.h>
#include <unistd.h>
#include <string.h>
#include <signal.h>
#include <netdb.h>
#include <ctype.h>
#ifdef HAVE_STDINT_H
#include <stdint.h>
#endif
#ifdef HAVE_SYS_POLL_H
#include <sys/poll.h>
#elif HAVE_POLL_H
#include <poll.h>
#else
#include "../common/fakepoll.h"
#endif
#include <sys/types.h>
#include <sys/fcntl.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <sys/stat.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <errno.h>
#include <assert.h>
#include <time.h>
#include "../common/crypto.h"
#include "../common/log.h"
#include "../common/util.h"
#define MAXCONNECTIONS 1000 /* upper bound on max connections.
can be lowered by config file */
#define MAX_BUF_SIZE (640*1024)
#define DEFAULT_BANDWIDTH_OP (1024 * 1000)
#define HANDSHAKE_AS_OP 1
#define HANDSHAKE_AS_OR 2
#define ACI_TYPE_LOWER 0
#define ACI_TYPE_HIGHER 1
#define ACI_TYPE_BOTH 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_DNSWORKER 10
#define LISTENER_STATE_READY 0
#define DNSWORKER_STATE_IDLE 0
#define DNSWORKER_STATE_BUSY 1
/* 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 /* connecting to this 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 dns farm */
#define EXIT_CONN_STATE_CONNECTING 1 /* waiting for connect() to finish */
#define EXIT_CONN_STATE_OPEN 2
#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 */
#endif
#define AP_CONN_STATE_SOCKS_WAIT 3
#define AP_CONN_STATE_OR_WAIT 4
#define AP_CONN_STATE_OPEN 5
#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_BUILDING 0 /* I'm the OP, still haven't done all my handshakes */
#define CIRCUIT_STATE_ONIONSKIN_PENDING 1 /* waiting to process the onion */
#define CIRCUIT_STATE_OR_WAIT 2 /* I'm the OP, 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 */
//#define CIRCUIT_STATE_CLOSE 4 /* both acks received, connection is dead */ /* NOT USED */
#define RELAY_COMMAND_BEGIN 1
#define RELAY_COMMAND_DATA 2
#define RELAY_COMMAND_END 3
#define RELAY_COMMAND_CONNECTED 4
#define RELAY_COMMAND_SENDME 5
#define RELAY_COMMAND_EXTEND 6
#define RELAY_COMMAND_EXTENDED 7
#define RELAY_COMMAND_TRUNCATE 8
#define RELAY_COMMAND_TRUNCATED 9
#define RELAY_HEADER_SIZE 8
#define RELAY_STATE_RESOLVING
/* default cipher function */
#define DEFAULT_CIPHER CRYPTO_CIPHER_3DES
#define CELL_DIRECTION_IN 1
#define CELL_DIRECTION_OUT 2
#define EDGE_EXIT CONN_TYPE_EXIT
#define EDGE_AP CONN_TYPE_AP
#define CELL_DIRECTION(x) ((x) == EDGE_EXIT ? CELL_DIRECTION_IN : CELL_DIRECTION_OUT)
#define CIRCWINDOW_START 1000
#define CIRCWINDOW_INCREMENT 100
#define STREAMWINDOW_START 500
#define STREAMWINDOW_INCREMENT 50
/* cell commands */
#define CELL_PADDING 0
#define CELL_CREATE 1
#define CELL_CREATED 2
#define CELL_RELAY 3
#define CELL_DESTROY 4
#define CELL_PAYLOAD_SIZE 248
#define CELL_NETWORK_SIZE 256
/* 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;
};
typedef uint16_t aci_t;
/* cell definition */
typedef struct {
aci_t aci; /* Anonymous Connection Identifier */
unsigned char command;
unsigned char length; /* of payload if relay cell */
uint32_t seq; /* sequence number */
unsigned char payload[CELL_PAYLOAD_SIZE];
} cell_t;
#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\0"
#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 {
/* 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;
int inbuf_reached_eof;
long timestamp_lastread;
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;
/* 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 */
/* link encryption */
crypto_cipher_env_t *f_crypto;
crypto_cipher_env_t *b_crypto;
// 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. */
uint16_t port;
/* used by exit and ap: */
char stream_id[STREAM_ID_SIZE];
struct connection_t *next_stream;
struct crypt_path_t *cpath_layer; /* a pointer to which node in the circ this conn exits at */
int package_window;
int deliver_window;
int done_sending;
int done_receiving;
/* 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 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 */
/* Used while negotiating OR/OR connections */
char nonce[8];
/* Used by worker connections */
int num_processed;
};
typedef struct connection_t connection_t;
#define EXIT_POLICY_ACCEPT 1
#define EXIT_POLICY_REJECT 2
struct exit_policy_t {
char policy_type;
char *string;
char *address;
char *port;
struct exit_policy_t *next;
};
/* config stuff we know about the other ORs in the network */
typedef struct {
char *address;
uint32_t addr; /* all host order */
uint16_t or_port;
uint16_t op_port;
uint16_t ap_port;
uint16_t dir_port;
crypto_pk_env_t *pkey; /* public RSA key */
crypto_pk_env_t *signing_pkey; /* May be null */
/* link info */
uint32_t bandwidth;
struct exit_policy_t *exit_policy;
} routerinfo_t;
#define MAX_ROUTERS_IN_DIR 1024
typedef struct {
routerinfo_t **routers;
int n_routers;
char *software_versions;
} directory_t;
struct crypt_path_t {
/* crypto environments */
crypto_cipher_env_t *f_crypto;
crypto_cipher_env_t *b_crypto;
crypto_dh_env_t *handshake_state;
uint32_t addr;
uint16_t port;
char state;
#define CPATH_STATE_CLOSED 0
#define CPATH_STATE_AWAITING_KEYS 1
#define CPATH_STATE_OPEN 2
struct crypt_path_t *next;
struct crypt_path_t *prev; /* doubly linked list */
int package_window;
int deliver_window;
};
#define DH_KEY_LEN CRYPTO_DH_SIZE
#define DH_ONIONSKIN_LEN DH_KEY_LEN+16
typedef struct crypt_path_t crypt_path_t;
/* struct for a path (circuit) through the network */
typedef struct {
uint32_t n_addr;
uint16_t n_port;
connection_t *p_conn;
connection_t *n_conn; /* for the OR conn, if there is one */
connection_t *p_streams;
connection_t *n_streams;
int package_window;
int deliver_window;
aci_t p_aci; /* connection identifiers */
aci_t n_aci;
crypto_cipher_env_t *p_crypto; /* used only for intermediate hops */
crypto_cipher_env_t *n_crypto;
crypt_path_t *cpath;
char onionskin[DH_ONIONSKIN_LEN]; /* for storage while onionskin pending */
long timestamp_created;
char dirty; /* whether this circuit has been used yet */
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 onion_queue_t *next;
};
typedef struct {
char *LogLevel;
char *RouterFile;
char *SigningPrivateKeyFile;
char *PrivateKeyFile;
double CoinWeight;
int Daemon;
int ORPort;
int APPort;
int DirPort;
int MaxConn;
int OnionRouter;
int TrafficShaping;
int LinkPadding;
int DirRebuildPeriod;
int DirFetchPeriod;
int KeepalivePeriod;
int MaxOnionsPending;
int NewCircuitPeriod;
int Role;
int loglevel;
} or_options_t;
/* all the function prototypes go here */
/********************************* buffers.c ***************************/
int buf_new(char **buf, int *buflen, int *buf_datalen);
void buf_free(char *buf);
int read_to_buf(int s, int at_most, char **buf, int *buflen, int *buf_datalen, int *reached_eof);
/* 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);
/* 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);
/* 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)
*/
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.
*/
/********************************* cell.c ***************************/
int pack_create(uint16_t aci, unsigned char *onion, uint32_t onionlen, unsigned char **cellbuf, unsigned int *cellbuflen);
/********************************* 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_newest_ap(void);
circuit_t *circuit_enumerate_by_naddr_nport(circuit_t *start, uint32_t naddr, uint16_t nport);
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);
int circuit_consider_sending_sendme(circuit_t *circ, int edge_type, crypt_path_t *layer_hint);
void circuit_free(circuit_t *circ);
void circuit_free_cpath(crypt_path_t *cpath);
void circuit_free_cpath_node(crypt_path_t *victim);
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);
void circuit_expire_unused_circuits(void);
void circuit_launch_new(int failure_status);
int circuit_establish_circuit(void);
void circuit_n_conn_open(connection_t *or_conn);
int circuit_send_next_onion_skin(circuit_t *circ);
int circuit_extend(cell_t *cell, circuit_t *circ);
int circuit_finish_handshake(circuit_t *circ, char *reply);
int circuit_truncated(circuit_t *circ, crypt_path_t *layer);
/********************************* 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_created_cell(cell_t *cell, connection_t *conn);
void command_process_sendme_cell(cell_t *cell, connection_t *conn);
void command_process_relay_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);
/********************************* 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);
/* return 0 if success, <0 if failure. */
int getconfig(int argc, char **argv, or_options_t *options);
/********************************* connection.c ***************************/
int tv_cmp(struct timeval *a, struct timeval *b);
connection_t *connection_new(int type);
void connection_free(connection_t *conn);
int connection_create_listener(struct sockaddr_in *bindaddr, int type);
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(uint16_t or_listenport, uint16_t ap_listenport, uint16_t dir_listenport);
int connection_read_to_buf(connection_t *conn);
int connection_fetch_from_buf(char *string, int len, connection_t *conn);
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);
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);
#define connection_speaks_cells(conn) ((conn)->type == CONN_TYPE_OR)
int connection_is_listener(connection_t *conn);
int connection_state_is_open(connection_t *conn);
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);
int connection_process_inbuf(connection_t *conn);
int connection_package_raw_inbuf(connection_t *conn);
int connection_process_cell_from_inbuf(connection_t *conn);
int connection_consider_sending_sendme(connection_t *conn, int edge_type);
int connection_finished_flushing(connection_t *conn);
void cell_pack(char *dest, const cell_t *src);
void cell_unpack(cell_t *dest, const char *src);
/********************************* connection_ap.c ****************************/
int ap_handshake_process_socks(connection_t *conn);
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_create_listener(struct sockaddr_in *bindaddr);
int connection_ap_handle_listener_read(connection_t *conn);
/********************************* connection_edge.c ***************************/
int connection_edge_process_inbuf(connection_t *conn);
int connection_edge_send_command(connection_t *fromconn, circuit_t *circ, int relay_command);
int connection_edge_process_relay_cell(cell_t *cell, circuit_t *circ, connection_t *conn, int edge_type, crypt_path_t *layer_hint);
int connection_edge_finished_flushing(connection_t *conn);
/********************************* connection_exit.c ***************************/
int connection_exit_send_connected(connection_t *conn);
int connection_exit_begin_conn(cell_t *cell, circuit_t *circ);
int connection_exit_connect(connection_t *conn);
/********************************* 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);
int connection_op_handle_listener_read(connection_t *conn);
/********************************* connection_or.c ***************************/
int connection_or_process_inbuf(connection_t *conn);
int connection_or_finished_flushing(connection_t *conn);
connection_t *connection_or_connect(routerinfo_t *router);
int connection_or_create_listener(struct sockaddr_in *bindaddr);
int connection_or_handle_listener_read(connection_t *conn);
/********************************* 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 ***************************/
void dns_init(void);
int connection_dns_finished_flushing(connection_t *conn);
int connection_dns_process_inbuf(connection_t *conn);
int dns_resolve(connection_t *exitconn);
/********************************* main.c ***************************/
void set_privatekey(crypto_pk_env_t *k);
crypto_pk_env_t *get_privatekey(void);
void set_signing_privatekey(crypto_pk_env_t *k);
crypto_pk_env_t *get_signing_privatekey(void);
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);
connection_t *connection_get_by_type(int type);
connection_t *connection_get_by_type_state(int type, int state);
connection_t *connection_get_by_type_state_lastwritten(int type, int state);
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);
void check_conn_read(int i);
void check_conn_marked(int i);
void check_conn_write(int i);
int prepare_for_poll(int *timeout);
int do_main_loop(void);
void dumpstats(void);
int dump_signed_directory_to_string(char *s, int maxlen,
crypto_pk_env_t *private_key);
/* Exported for debugging */
int dump_signed_directory_to_string_impl(char *s, int maxlen,
directory_t *dir,
crypto_pk_env_t *private_key);
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);
/* 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);
crypt_path_t *onion_generate_cpath(routerinfo_t **firsthop);
int onion_skin_create(crypto_pk_env_t *router_key,
crypto_dh_env_t **handshake_state_out,
char *onion_skin_out); /* Must be DH_ONIONSKIN_LEN bytes long */
int onion_skin_server_handshake(char *onion_skin, /* DH_ONIONSKIN_LEN bytes long */
crypto_pk_env_t *private_key,
char *handshake_reply_out, /* DH_KEY_LEN bytes long */
char *key_out,
int key_out_len);
int onion_skin_client_handshake(crypto_dh_env_t *handshake_state,
char *handshake_reply,/* Must be DH_KEY_LEN bytes long*/
char *key_out,
int key_out_len);
/********************************* 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);
void router_get_directory(directory_t **pdirectory);
int router_is_me(uint32_t addr, uint16_t port);
void router_forget_router(uint32_t addr, uint16_t port);
int router_get_list_from_file(char *routerfile);
int router_resolve(routerinfo_t *router);
int router_resolve_directory(directory_t *dir);
/* Reads a list of known routers, unsigned. */
int router_get_list_from_string(char *s);
/* Exported for debugging */
int router_get_list_from_string_impl(char *s, directory_t **dest);
/* Reads a signed directory. */
int router_get_dir_from_string(char *s, crypto_pk_env_t *pkey);
/* Exported or debugging */
int router_get_dir_from_string_impl(char *s, directory_t **dest,
crypto_pk_env_t *pkey);
routerinfo_t *router_get_entry_from_string(char **s);
int router_compare_to_exit_policy(connection_t *conn);
void routerinfo_free(routerinfo_t *router);
#endif
/*
Local Variables:
mode:c
indent-tabs-mode:nil
c-basic-offset:2
End:
*/
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