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155c9b80ca
httpap is obsolete; we support privoxy directly now! smtpap is obsolete; need to find a good socks4a-enabled smtp proxy/client I dub thee 0.0.1. svn:r107
631 lines
20 KiB
C
631 lines
20 KiB
C
/* Copyright 2001,2002 Roger Dingledine, Matej Pfajfar. */
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/* See LICENSE for licensing information */
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/* $Id$ */
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#ifndef __OR_H
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#define __OR_H
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#include "orconfig.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <limits.h>
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#include <unistd.h>
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#include <string.h>
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#include <signal.h>
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#include <netdb.h>
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#include <ctype.h>
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#ifdef HAVE_STDINT_H
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#include <stdint.h>
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#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
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#include <poll.h>
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#else
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#include "../common/fakepoll.h"
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#endif
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#include <sys/types.h>
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#include <sys/fcntl.h>
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#include <sys/ioctl.h>
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#include <sys/socket.h>
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#include <sys/time.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <errno.h>
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#include <assert.h>
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#include <time.h>
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#include "../common/config.h"
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#include "../common/crypto.h"
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#include "../common/log.h"
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#include "../common/ss.h"
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#include "../common/version.h"
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#define MAXCONNECTIONS 200 /* upper bound on max connections.
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can be overridden by config file */
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#define MAX_BUF_SIZE (640*1024)
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#define DEFAULT_BANDWIDTH_OP 102400
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#define ACI_TYPE_LOWER 0
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#define ACI_TYPE_HIGHER 1
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#define ACI_TYPE_BOTH 2
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/* bitvector of the roles that we might want to play. You can or (|) them together */
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#define ROLE_OR_LISTEN 1
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#define ROLE_OR_CONNECT_ALL 2
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#define ROLE_OP_LISTEN 4
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#define ROLE_AP_LISTEN 8
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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
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#define CONN_TYPE_OP 2
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#define CONN_TYPE_OR_LISTENER 3
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#define CONN_TYPE_OR 4
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#define CONN_TYPE_EXIT 5
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#define CONN_TYPE_AP_LISTENER 6
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#define CONN_TYPE_AP 7
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#define LISTENER_STATE_READY 0
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#define OP_CONN_STATE_AWAITING_KEYS 0
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#define OP_CONN_STATE_OPEN 1
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#if 0
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#define OP_CONN_STATE_CLOSE 2 /* flushing the buffer, then will close */
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#define OP_CONN_STATE_CLOSE_WAIT 3 /* have sent a destroy, awaiting a confirmation */
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#endif
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/* how to read these states:
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* foo_CONN_STATE_bar_baz:
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* "I am acting as a bar, currently in stage baz of talking with a foo."
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*/
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#define OR_CONN_STATE_OP_CONNECTING 0 /* an application proxy wants me to connect to this OR */
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#define OR_CONN_STATE_OP_SENDING_KEYS 1
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#define OR_CONN_STATE_CLIENT_CONNECTING 2 /* I'm connecting to this OR as an OR */
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#define OR_CONN_STATE_CLIENT_SENDING_AUTH 3 /* sending address and info */
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#define OR_CONN_STATE_CLIENT_AUTH_WAIT 4 /* have sent address and info, waiting */
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#define OR_CONN_STATE_CLIENT_SENDING_NONCE 5 /* sending nonce, last piece of handshake */
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#define OR_CONN_STATE_SERVER_AUTH_WAIT 6 /* waiting for address and info */
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#define OR_CONN_STATE_SERVER_SENDING_AUTH 7 /* writing auth and nonce */
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#define OR_CONN_STATE_SERVER_NONCE_WAIT 8 /* waiting for confirmation of nonce */
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#define OR_CONN_STATE_OPEN 9 /* ready to send/receive cells. */
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#define EXIT_CONN_STATE_CONNECTING_WAIT 0 /* waiting for standard structure or dest info */
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#define EXIT_CONN_STATE_CONNECTING 1
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#define EXIT_CONN_STATE_OPEN 2
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#if 0
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#define EXIT_CONN_STATE_CLOSE 3 /* flushing the buffer, then will close */
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#define EXIT_CONN_STATE_CLOSE_WAIT 4 /* have sent a destroy, awaiting a confirmation */
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#endif
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#define AP_CONN_STATE_SOCKS_WAIT 0
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#define AP_CONN_STATE_OR_WAIT 1
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#define AP_CONN_STATE_OPEN 2
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#define CIRCUIT_STATE_OPEN_WAIT 0 /* receiving/processing the onion */
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#define CIRCUIT_STATE_OR_WAIT 1 /* I'm at the beginning of the path, my firsthop is still connecting */
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#define CIRCUIT_STATE_OPEN 2 /* onion processed, ready to send data along the connection */
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#define CIRCUIT_STATE_CLOSE_WAIT1 3 /* sent two "destroy" signals, waiting for acks */
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#define CIRCUIT_STATE_CLOSE_WAIT2 4 /* received one ack, waiting for one more
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(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 */
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/* available cipher functions */
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#define ONION_CIPHER_IDENTITY 0
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#define ONION_CIPHER_DES 1
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#define ONION_CIPHER_RC4 2
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/* default cipher function */
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#define ONION_DEFAULT_CIPHER ONION_CIPHER_DES
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#define RECEIVE_WINDOW_START 100
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#define RECEIVE_WINDOW_INCREMENT 10
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/* cell commands */
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#define CELL_PADDING 0
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#define CELL_CREATE 1
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#define CELL_DATA 2
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#define CELL_DESTROY 3
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#define CELL_ACK 4
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#define CELL_NACK 5
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#define CELL_SENDME 6
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#define CELL_CONNECTED 7
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#define CELL_PAYLOAD_SIZE 120
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typedef uint16_t aci_t;
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/* cell definition */
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typedef struct
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{
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aci_t aci; /* Anonymous Connection Identifier */
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unsigned char command;
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unsigned char length; /* of payload if data cell, else value of sendme */
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uint32_t seq; /* sequence number */
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unsigned char payload[120];
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} cell_t;
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#define SOCKS4_REQUEST_GRANTED 90
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#define SOCKS4_REQUEST_REJECT 91
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#define SOCKS4_REQUEST_IDENT_FAILED 92
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#define SOCKS4_REQUEST_IDENT_CONFLICT 93
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/* structure of a socks client operation */
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typedef struct {
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unsigned char version; /* socks version number */
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unsigned char command; /* command code */
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unsigned char destport[2]; /* destination port, network order */
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unsigned char destip[4]; /* destination address */
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/* userid follows, terminated by a NULL */
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/* dest host follows, terminated by a NULL */
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} socks4_t;
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typedef struct
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{
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/* Used by all types: */
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unsigned char type;
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int state;
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int s; /* our socket */
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int poll_index;
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int marked_for_close;
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char *inbuf;
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int inbuflen;
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int inbuf_datalen;
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int inbuf_reached_eof;
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char *outbuf;
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int outbuflen; /* how many bytes are allocated for the outbuf? */
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int outbuf_flushlen; /* how much data should we try to flush from the outbuf? */
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int outbuf_datalen; /* how much data is there total on the outbuf? */
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// uint16_t aci; /* anonymous connection identifier */
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/* used by OR and OP: */
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uint32_t bandwidth; /* connection bandwidth */
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int receiver_bucket; /* when this hits 0, stop receiving. Every second we
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* add 'bandwidth' to this, capping it at 10*bandwidth.
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*/
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struct timeval send_timeval; /* for determining when to send the next cell */
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/* link encryption */
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crypto_cipher_env_t *f_crypto;
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crypto_cipher_env_t *b_crypto;
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// struct timeval lastsend; /* time of last transmission to the client */
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// struct timeval interval; /* transmission interval */
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uint32_t addr; /* these two uniquely identify a router */
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uint16_t port;
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/* used by exit and ap: */
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// ss_t ss; /* standard structure */
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// int ss_received; /* size of ss, received so far */
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char socks_version;
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char read_username;
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char *dest_addr;
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uint16_t dest_port;
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/* used by OR, to keep state while connect()ing: Kludge. */
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crypto_pk_env_t *prkey;
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struct sockaddr_in local;
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#if 0 /* obsolete, we now use conn->bandwidth */
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/* link info */
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uint32_t min;
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uint32_t max;
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#endif
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char *address; /* strdup into this, because free_connection frees it */
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crypto_pk_env_t *pkey; /* public RSA key for the other side */
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char nonce[8];
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} connection_t;
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/* config stuff we know about the other ORs in the network */
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typedef struct
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{
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char *address;
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uint32_t addr;
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uint16_t or_port;
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uint16_t op_port;
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uint16_t ap_port;
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crypto_pk_env_t *pkey; /* public RSA key */
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/* link info */
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uint32_t min;
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uint32_t max;
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// struct timeval min_interval;
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/* time when last data was sent to that router */
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// struct timeval lastsend;
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/* socket */
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// int s;
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void *next;
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} routerinfo_t;
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typedef struct
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{
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unsigned int forwf;
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unsigned int backf;
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char digest2[20]; /* second SHA output for onion_layer_t.keyseed */
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char digest3[20]; /* third SHA output for onion_layer_t.keyseed */
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/* crypto environments */
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crypto_cipher_env_t *f_crypto;
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crypto_cipher_env_t *b_crypto;
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} crypt_path_t;
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/* per-anonymous-connection struct */
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typedef struct
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{
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#if 0
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uint32_t p_addr; /* all in network order */
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uint16_t p_port;
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#endif
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uint32_t n_addr;
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uint16_t n_port;
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connection_t *p_conn;
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connection_t *n_conn;
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int n_receive_window;
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int p_receive_window;
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aci_t p_aci; /* connection identifiers */
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aci_t n_aci;
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unsigned char p_f; /* crypto functions */
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unsigned char n_f;
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crypto_cipher_env_t *p_crypto; /* crypto environments */
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crypto_cipher_env_t *n_crypto;
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crypt_path_t **cpath;
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int cpathlen;
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uint32_t expire; /* expiration time for the corresponding onion */
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int state;
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unsigned char *onion; /* stores the onion when state is CONN_STATE_OPEN_WAIT */
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uint32_t onionlen; /* total onion length */
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uint32_t recvlen; /* length of the onion so far */
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void *next;
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} circuit_t;
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typedef struct
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{
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int zero:1;
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int version:7;
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int backf:4;
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int forwf:4;
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uint16_t port;
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uint32_t addr;
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time_t expire;
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unsigned char keyseed[16];
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} onion_layer_t;
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typedef struct
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{
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time_t expire;
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char digest[20]; /* SHA digest of the onion */
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void *prev;
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void *next;
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} tracked_onion_t;
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typedef struct
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{
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char *LogLevel;
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char *RouterFile;
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char *PrivateKeyFile;
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float CoinWeight;
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int ORPort;
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int OPPort;
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int APPort;
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int MaxConn;
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int TrafficShaping;
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int LinkPadding;
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int Role;
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int loglevel;
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} or_options_t;
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/* all the function prototypes go here */
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/********************************* buffers.c ***************************/
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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 */
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int flush_buf(int s, char **buf, int *buflen, int *buf_flushlen, int *buf_datalen);
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/* push from buf onto s
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* then memmove to front of buf
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* return -1 or how many bytes remain on the buf */
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int write_to_buf(char *string, int string_len,
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char **buf, int *buflen, int *buf_datalen);
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/* append string to buf (growing as needed, return -1 if "too big")
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* return total number of bytes on the buf
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*/
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int fetch_from_buf(char *string, int string_len,
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char **buf, int *buflen, int *buf_datalen);
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/* if there is string_len bytes in buf, write them onto string,
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* * then memmove buf back (that is, remove them from buf) */
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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 ***************************/
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void circuit_add(circuit_t *circ);
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void circuit_remove(circuit_t *circ);
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circuit_t *circuit_new(aci_t p_aci, connection_t *p_conn);
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/* internal */
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aci_t get_unique_aci_by_addr_port(uint32_t addr, uint16_t port, int aci_type);
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circuit_t *circuit_get_by_aci_conn(aci_t aci, connection_t *conn);
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circuit_t *circuit_get_by_conn(connection_t *conn);
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circuit_t *circuit_get_by_naddr_nport(uint32_t naddr, uint16_t nport);
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int circuit_deliver_data_cell(cell_t *cell, circuit_t *circ, connection_t *conn, int crypt_type);
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int circuit_crypt(circuit_t *circ, char *in, int inlen, char crypt_type);
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int circuit_init(circuit_t *circ, int aci_type);
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void circuit_free(circuit_t *circ);
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void circuit_free_cpath(crypt_path_t **cpath, int cpathlen);
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void circuit_close(circuit_t *circ);
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void circuit_about_to_close_connection(connection_t *conn);
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/* flush and send destroys for all circuits using conn */
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void circuit_dump_by_conn(connection_t *conn);
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/********************************* command.c ***************************/
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void command_process_cell(cell_t *cell, connection_t *conn);
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void command_process_create_cell(cell_t *cell, connection_t *conn);
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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);
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void command_process_destroy_cell(cell_t *cell, connection_t *conn);
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void command_process_connected_cell(cell_t *cell, connection_t *conn);
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/********************************* config.c ***************************/
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/* loads the configuration file */
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int getconfig(char *filename, config_opt_t *options);
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/* create or_options_t from command-line args and config files(s) */
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int getoptions(int argc, char **argv, or_options_t *options);
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/********************************* connection.c ***************************/
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int tv_cmp(struct timeval *a, struct timeval *b);
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connection_t *connection_new(int type);
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void connection_free(connection_t *conn);
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int connection_create_listener(crypto_pk_env_t *prkey, struct sockaddr_in *local, int type);
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int connection_handle_listener_read(connection_t *conn, int new_type, int new_state);
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/* start all connections that should be up but aren't */
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int retry_all_connections(int role, routerinfo_t **router_array, int rarray_len,
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crypto_pk_env_t *prkey, uint16_t or_port, uint16_t op_port, uint16_t ap_port);
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connection_t *connection_connect_to_router_as_op(routerinfo_t *router, uint16_t local_or_port);
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int connection_read_to_buf(connection_t *conn);
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int connection_fetch_from_buf(char *string, int len, connection_t *conn);
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int connection_outbuf_too_full(connection_t *conn);
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int connection_wants_to_flush(connection_t *conn);
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int connection_flush_buf(connection_t *conn);
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int connection_write_to_buf(char *string, int len, connection_t *conn);
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void connection_send_cell(connection_t *conn);
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int connection_receiver_bucket_should_increase(connection_t *conn);
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void connection_increment_receiver_bucket (connection_t *conn);
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void connection_increment_send_timeval(connection_t *conn);
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void connection_init_timeval(connection_t *conn);
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int connection_speaks_cells(connection_t *conn);
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int connection_is_listener(connection_t *conn);
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int connection_state_is_open(connection_t *conn);
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int connection_send_destroy(aci_t aci, connection_t *conn);
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int connection_send_connected(aci_t aci, connection_t *conn);
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int connection_encrypt_cell(cell_t *cellp, connection_t *conn);
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int connection_write_cell_to_buf(cell_t *cellp, connection_t *conn);
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int connection_process_inbuf(connection_t *conn);
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int connection_package_raw_inbuf(connection_t *conn);
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int connection_process_cell_from_inbuf(connection_t *conn);
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int connection_consider_sending_sendme(connection_t *conn);
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int connection_finished_flushing(connection_t *conn);
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/********************************* 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,
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int onionlen, crypt_path_t **cpath);
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/* find the circ that's waiting on me, if any, and get it to send its onion */
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int ap_handshake_n_conn_open(connection_t *or_conn);
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int ap_handshake_send_onion(connection_t *ap_conn, connection_t *or_conn, circuit_t *circ);
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int ap_handshake_socks_reply(connection_t *conn, char result);
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int connection_ap_send_connected(connection_t *conn);
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int connection_ap_process_data_cell(cell_t *cell, connection_t *conn);
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int connection_ap_finished_flushing(connection_t *conn);
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int connection_ap_create_listener(crypto_pk_env_t *prkey, struct sockaddr_in *local);
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int connection_ap_handle_listener_read(connection_t *conn);
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/********************************* connection_exit.c ***************************/
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int connection_exit_process_inbuf(connection_t *conn);
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int connection_exit_package_inbuf(connection_t *conn);
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int connection_exit_send_connected(connection_t *conn);
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int connection_exit_process_data_cell(cell_t *cell, connection_t *conn);
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int connection_exit_finished_flushing(connection_t *conn);
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/********************************* connection_op.c ***************************/
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int op_handshake_process_keys(connection_t *conn);
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int connection_op_process_inbuf(connection_t *conn);
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int connection_op_finished_flushing(connection_t *conn);
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int connection_op_create_listener(crypto_pk_env_t *prkey, struct sockaddr_in *local);
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int connection_op_handle_listener_read(connection_t *conn);
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/********************************* connection_or.c ***************************/
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int connection_or_process_inbuf(connection_t *conn);
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int connection_or_finished_flushing(connection_t *conn);
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void conn_or_init_crypto(connection_t *conn);
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int or_handshake_op_send_keys(connection_t *conn);
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int or_handshake_op_finished_sending_keys(connection_t *conn);
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int or_handshake_client_process_auth(connection_t *conn);
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int or_handshake_client_send_auth(connection_t *conn);
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int or_handshake_server_process_auth(connection_t *conn);
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int or_handshake_server_process_nonce(connection_t *conn);
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connection_t *connect_to_router_as_or(routerinfo_t *router, crypto_pk_env_t *prkey, struct sockaddr_in *local);
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connection_t *connection_or_connect_as_or(routerinfo_t *router, crypto_pk_env_t *prkey, struct sockaddr_in *local);
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connection_t *connection_or_connect_as_op(routerinfo_t *router, struct sockaddr_in *local);
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int connection_or_create_listener(crypto_pk_env_t *prkey, struct sockaddr_in *local);
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int connection_or_handle_listener_read(connection_t *conn);
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/********************************* main.c ***************************/
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int connection_add(connection_t *conn);
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int connection_remove(connection_t *conn);
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void connection_set_poll_socket(connection_t *conn);
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int pkey_cmp(crypto_pk_env_t *a, crypto_pk_env_t *b);
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connection_t *connection_twin_get_by_addr_port(uint32_t addr, uint16_t port);
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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);
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routerinfo_t *router_get_by_addr_port(uint32_t addr, uint16_t port);
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unsigned int *router_new_route(int *routelen);
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unsigned char *router_create_onion(unsigned int *route, int routelen, int *len, crypt_path_t **cpath);
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routerinfo_t *router_get_first_in_route(unsigned int *route, int routelen);
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connection_t *connect_to_router_as_op(routerinfo_t *router);
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void connection_watch_events(connection_t *conn, short events);
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void connection_stop_reading(connection_t *conn);
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void connection_start_reading(connection_t *conn);
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void connection_stop_writing(connection_t *conn);
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void connection_start_writing(connection_t *conn);
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void check_conn_read(int i);
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void check_conn_marked(int i);
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void check_conn_write(int i);
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int prepare_for_poll(int *timeout);
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int do_main_loop(void);
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void catchint();
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void catchusr1();
|
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void dumpstats(void);
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int main(int argc, char *argv[]);
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/********************************* onion.c ***************************/
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int decide_aci_type(uint32_t local_addr, uint16_t local_port,
|
|
uint32_t remote_addr, uint16_t remote_port);
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|
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int process_onion(circuit_t *circ, connection_t *conn);
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/* uses a weighted coin with weight cw to choose a route length */
|
|
int chooselen(double cw);
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|
|
/* 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);
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|
/* 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 */
|
|
unsigned char *encrypt_onion(onion_layer_t *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 */
|
|
unsigned char *decrypt_onion(onion_layer_t *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);
|
|
|
|
/* create a new tracked_onion entry */
|
|
tracked_onion_t *new_tracked_onion(unsigned char *onion, uint32_t onionlen, tracked_onion_t **tracked_onions, tracked_onion_t **last_tracked_onion);
|
|
|
|
/* delete a tracked onion entry */
|
|
void remove_tracked_onion(tracked_onion_t *to, tracked_onion_t **tracked_onions, tracked_onion_t **last_tracked_onion);
|
|
|
|
/* find a tracked onion in the linked list of tracked onions */
|
|
tracked_onion_t *id_tracked_onion(unsigned char *onion, uint32_t onionlen, tracked_onion_t *tracked_onions);
|
|
|
|
/********************************* routers.c ***************************/
|
|
|
|
routerinfo_t **getrouters(char *routerfile, int *listlenp, uint16_t or_listenport);
|
|
void delete_routerlist(routerinfo_t *list);
|
|
/* create an NULL-terminated array of pointers pointing to elements of a router list */
|
|
routerinfo_t **make_rarray(routerinfo_t* list, int *len);
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|
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|
#endif
|