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2dda97e8fd
tor/src/or/or.h
Roger Dingledine 2dda97e8fd implemented cpuworkers 
please poke at it and report bugs

still needs polishing, and only handles onions now (should handle
OR handshakes too)


svn:r402
2003-08-20 23:05:22 +00:00

825 lines
26 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>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#ifdef HAVE_SIGNAL_H
#include <signal.h>
#endif
#ifdef HAVE_NETDB_H
#include <netdb.h>
#endif
#ifdef HAVE_CTYPE_H
#include <ctype.h>
#endif
#include "../common/torint.h"
#ifdef HAVE_SYS_POLL_H
#include <sys/poll.h>
#elif HAVE_POLL_H
#include <poll.h>
#else
#include "../common/fakepoll.h"
#endif
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#ifdef HAVE_SYS_WAIT_H
#include <sys/wait.h>
#endif
#ifdef HAVE_SYS_FCNTL_H
#include <sys/fcntl.h>
#endif
#ifdef HAVE_FCNTL_H
#include <fcntl.h>
#endif
#ifdef HAVE_SYS_IOCTL_H
#include <sys/ioctl.h>
#endif
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#endif
#ifdef HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif
#ifdef HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
#ifdef HAVE_ARPA_INET_H
#include <arpa/inet.h>
#endif
#ifdef HAVE_ERRNO_H
#include <errno.h>
#endif
#ifdef HAVE_ASSERT_H
#include <assert.h>
#endif
#ifdef HAVE_TIME_H
#include <time.h>
#endif
#ifdef HAVE_WINSOCK_H
#include <winsock.h>
#endif
#if _MSC_VER > 1300
#include <winsock2.h>
#include <ws2tcpip.h>
#elif defined(_MSC_VER)
#include <winsock.h>
#endif
#ifdef MS_WINDOWS
#include <io.h>
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#define snprintf _snprintf
#endif
#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 CONN_TYPE_CPUWORKER 11
#define LISTENER_STATE_READY 0
#define DNSWORKER_STATE_IDLE 0
#define DNSWORKER_STATE_BUSY 1
#define CPUWORKER_STATE_IDLE 0
#define CPUWORKER_STATE_BUSY_ONION 1
#define CPUWORKER_STATE_BUSY_HANDSHAKE 2
#define CPUWORKER_TASK_ONION CPUWORKER_STATE_BUSY_ONION
#define CPUWORKER_TASK_HANDSHAKE CPUWORKER_STATE_BUSY_HANDSHAKE
/* 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_AES_CTR
/* Used to en/decrypt onion skins */
#define ONION_CIPHER DEFAULT_CIPHER
/* Used to en/decrypt cells between ORs/OPs. */
#define CONNECTION_CIPHER DEFAULT_CIPHER
/* Used to en/decrypt RELAY cells */
#define CIRCUIT_CIPHER DEFAULT_CIPHER
#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: */
uint8_t type;
int state;
uint8_t wants_to_read;
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; /* statistics kept by dns worker */
struct circuit_t *circ; /* by cpu worker to know who he's working for */
};
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 */
struct circuit_t {
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;
};
typedef struct circuit_t 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 TotalBandwidth;
int NumCpus;
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 ***************************/
/* 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_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);
/********************************* cpuworker.c *****************************/
void cpu_init(void);
int connection_cpu_finished_flushing(connection_t *conn);
int connection_cpu_process_inbuf(connection_t *conn);
int cpuworker_main(void *data);
int assign_to_cpuworker(connection_t *cpuworker, unsigned char question_type,
void *task);
/********************************* 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);
void dns_cancel_pending_resolve(char *question, connection_t *onlyconn);
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);
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);
circuit_t *onion_next_task(void);
void onion_pending_remove(circuit_t *circ);
int onionskin_process(circuit_t *circ, unsigned char *payload, unsigned char *keys);
/* 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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