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tor/src/or/parsecommon.h

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/* Copyright (c) 2016-2017, The Tor Project, Inc. */
/* See LICENSE for licensing information */
/**
* \file parsecommon.h
* \brief Header file for parsecommon.c
**/
#ifndef TOR_PARSECOMMON_H
#define TOR_PARSECOMMON_H
#include "container.h"
#include "crypto.h"
#include "memarea.h"
/** Enumeration of possible token types. The ones starting with K_ correspond
* to directory 'keywords'. A_ is for an annotation, R or C is related to
* hidden services, ERR_ is an error in the tokenizing process, EOF_ is an
* end-of-file marker, and NIL_ is used to encode not-a-token.
*/
typedef enum {
K_ACCEPT = 0,
K_ACCEPT6,
K_DIRECTORY_SIGNATURE,
K_RECOMMENDED_SOFTWARE,
K_REJECT,
K_REJECT6,
K_ROUTER,
K_SIGNED_DIRECTORY,
K_SIGNING_KEY,
K_ONION_KEY,
K_ONION_KEY_NTOR,
K_ROUTER_SIGNATURE,
K_PUBLISHED,
K_RUNNING_ROUTERS,
K_ROUTER_STATUS,
K_PLATFORM,
K_PROTO,
K_OPT,
K_BANDWIDTH,
K_CONTACT,
K_NETWORK_STATUS,
K_UPTIME,
K_DIR_SIGNING_KEY,
K_FAMILY,
K_FINGERPRINT,
K_HIBERNATING,
K_READ_HISTORY,
K_WRITE_HISTORY,
K_NETWORK_STATUS_VERSION,
K_DIR_SOURCE,
K_DIR_OPTIONS,
K_CLIENT_VERSIONS,
K_SERVER_VERSIONS,
K_RECOMMENDED_CLIENT_PROTOCOLS,
K_RECOMMENDED_RELAY_PROTOCOLS,
K_REQUIRED_CLIENT_PROTOCOLS,
K_REQUIRED_RELAY_PROTOCOLS,
K_OR_ADDRESS,
K_ID,
K_P,
K_P6,
K_R,
K_A,
K_S,
K_V,
K_W,
K_M,
K_EXTRA_INFO,
K_EXTRA_INFO_DIGEST,
K_CACHES_EXTRA_INFO,
K_HIDDEN_SERVICE_DIR,
K_ALLOW_SINGLE_HOP_EXITS,
K_IPV6_POLICY,
K_ROUTER_SIG_ED25519,
K_IDENTITY_ED25519,
K_MASTER_KEY_ED25519,
K_ONION_KEY_CROSSCERT,
K_NTOR_ONION_KEY_CROSSCERT,
K_DIRREQ_END,
K_DIRREQ_V2_IPS,
K_DIRREQ_V3_IPS,
K_DIRREQ_V2_REQS,
K_DIRREQ_V3_REQS,
K_DIRREQ_V2_SHARE,
K_DIRREQ_V3_SHARE,
K_DIRREQ_V2_RESP,
K_DIRREQ_V3_RESP,
K_DIRREQ_V2_DIR,
K_DIRREQ_V3_DIR,
K_DIRREQ_V2_TUN,
K_DIRREQ_V3_TUN,
K_ENTRY_END,
K_ENTRY_IPS,
K_CELL_END,
K_CELL_PROCESSED,
K_CELL_QUEUED,
K_CELL_TIME,
K_CELL_CIRCS,
K_EXIT_END,
K_EXIT_WRITTEN,
K_EXIT_READ,
K_EXIT_OPENED,
K_DIR_KEY_CERTIFICATE_VERSION,
K_DIR_IDENTITY_KEY,
K_DIR_KEY_PUBLISHED,
K_DIR_KEY_EXPIRES,
K_DIR_KEY_CERTIFICATION,
K_DIR_KEY_CROSSCERT,
K_DIR_ADDRESS,
K_DIR_TUNNELLED,
K_VOTE_STATUS,
K_VALID_AFTER,
K_FRESH_UNTIL,
K_VALID_UNTIL,
K_VOTING_DELAY,
K_KNOWN_FLAGS,
K_PARAMS,
K_BW_WEIGHTS,
K_VOTE_DIGEST,
K_CONSENSUS_DIGEST,
K_ADDITIONAL_DIGEST,
K_ADDITIONAL_SIGNATURE,
K_CONSENSUS_METHODS,
K_CONSENSUS_METHOD,
K_LEGACY_DIR_KEY,
K_DIRECTORY_FOOTER,
K_SIGNING_CERT_ED,
K_SR_FLAG,
K_COMMIT,
K_PREVIOUS_SRV,
K_CURRENT_SRV,
K_PACKAGE,
A_PURPOSE,
A_LAST_LISTED,
A_UNKNOWN_,
R_RENDEZVOUS_SERVICE_DESCRIPTOR,
R_VERSION,
R_PERMANENT_KEY,
R_SECRET_ID_PART,
R_PUBLICATION_TIME,
R_PROTOCOL_VERSIONS,
R_INTRODUCTION_POINTS,
R_SIGNATURE,
R_HS_DESCRIPTOR, /* From version 3, this MUST be generic to all future
descriptor versions thus making it R_. */
R3_DESC_LIFETIME,
R3_DESC_SIGNING_CERT,
R3_REVISION_COUNTER,
R3_SUPERENCRYPTED,
R3_SIGNATURE,
R3_CREATE2_FORMATS,
R3_INTRO_AUTH_REQUIRED,
R3_SINGLE_ONION_SERVICE,
R3_INTRODUCTION_POINT,
R3_INTRO_ONION_KEY,
R3_INTRO_AUTH_KEY,
R3_INTRO_ENC_KEY,
R3_INTRO_ENC_KEY_CERT,
R3_INTRO_LEGACY_KEY,
R3_INTRO_LEGACY_KEY_CERT,
R3_DESC_AUTH_TYPE,
R3_DESC_AUTH_KEY,
R3_DESC_AUTH_CLIENT,
R3_ENCRYPTED,
R_IPO_IDENTIFIER,
R_IPO_IP_ADDRESS,
R_IPO_ONION_PORT,
R_IPO_ONION_KEY,
R_IPO_SERVICE_KEY,
C_CLIENT_NAME,
C_DESCRIPTOR_COOKIE,
C_CLIENT_KEY,
ERR_,
EOF_,
NIL_
} directory_keyword;
/** Structure to hold a single directory token.
*
* We parse a directory by breaking it into "tokens", each consisting
* of a keyword, a line full of arguments, and a binary object. The
* arguments and object are both optional, depending on the keyword
* type.
*
* This structure is only allocated in memareas; do not allocate it on
* the heap, or token_clear() won't work.
*/
typedef struct directory_token_t {
directory_keyword tp; /**< Type of the token. */
int n_args:30; /**< Number of elements in args */
char **args; /**< Array of arguments from keyword line. */
char *object_type; /**< -----BEGIN [object_type]-----*/
size_t object_size; /**< Bytes in object_body */
char *object_body; /**< Contents of object, base64-decoded. */
crypto_pk_t *key; /**< For public keys only. Heap-allocated. */
char *error; /**< For ERR_ tokens only. */
} directory_token_t;
/** We use a table of rules to decide how to parse each token type. */
/** Rules for whether the keyword needs an object. */
typedef enum {
NO_OBJ, /**< No object, ever. */
NEED_OBJ, /**< Object is required. */
NEED_SKEY_1024,/**< Object is required, and must be a 1024 bit private key */
NEED_KEY_1024, /**< Object is required, and must be a 1024 bit public key */
NEED_KEY, /**< Object is required, and must be a public key. */
OBJ_OK, /**< Object is optional. */
} obj_syntax;
#define AT_START 1
#define AT_END 2
#define TS_ANNOTATIONS_OK 1
#define TS_NOCHECK 2
#define TS_NO_NEW_ANNOTATIONS 4
/**
* @name macros for defining token rules
*
* Helper macros to define token tables. 's' is a string, 't' is a
* directory_keyword, 'a' is a trio of argument multiplicities, and 'o' is an
* object syntax.
*/
/**@{*/
/** Appears to indicate the end of a table. */
#define END_OF_TABLE { NULL, NIL_, 0,0,0, NO_OBJ, 0, INT_MAX, 0, 0 }
/** An item with no restrictions: used for obsolete document types */
#define T(s,t,a,o) { s, t, a, o, 0, INT_MAX, 0, 0 }
/** An item with no restrictions on multiplicity or location. */
#define T0N(s,t,a,o) { s, t, a, o, 0, INT_MAX, 0, 0 }
/** An item that must appear exactly once */
#define T1(s,t,a,o) { s, t, a, o, 1, 1, 0, 0 }
/** An item that must appear exactly once, at the start of the document */
#define T1_START(s,t,a,o) { s, t, a, o, 1, 1, AT_START, 0 }
/** An item that must appear exactly once, at the end of the document */
#define T1_END(s,t,a,o) { s, t, a, o, 1, 1, AT_END, 0 }
/** An item that must appear one or more times */
#define T1N(s,t,a,o) { s, t, a, o, 1, INT_MAX, 0, 0 }
/** An item that must appear no more than once */
#define T01(s,t,a,o) { s, t, a, o, 0, 1, 0, 0 }
/** An annotation that must appear no more than once */
#define A01(s,t,a,o) { s, t, a, o, 0, 1, 0, 1 }
/** Argument multiplicity: any number of arguments. */
#define ARGS 0,INT_MAX,0
/** Argument multiplicity: no arguments. */
#define NO_ARGS 0,0,0
/** Argument multiplicity: concatenate all arguments. */
#define CONCAT_ARGS 1,1,1
/** Argument multiplicity: at least <b>n</b> arguments. */
#define GE(n) n,INT_MAX,0
/** Argument multiplicity: exactly <b>n</b> arguments. */
#define EQ(n) n,n,0
/**@}*/
/** Determines the parsing rules for a single token type. */
typedef struct token_rule_t {
/** The string value of the keyword identifying the type of item. */
const char *t;
/** The corresponding directory_keyword enum. */
directory_keyword v;
/** Minimum number of arguments for this item */
int min_args;
/** Maximum number of arguments for this item */
int max_args;
/** If true, we concatenate all arguments for this item into a single
* string. */
int concat_args;
/** Requirements on object syntax for this item. */
obj_syntax os;
/** Lowest number of times this item may appear in a document. */
int min_cnt;
/** Highest number of times this item may appear in a document. */
int max_cnt;
/** One or more of AT_START/AT_END to limit where the item may appear in a
* document. */
int pos;
/** True iff this token is an annotation. */
int is_annotation;
} token_rule_t;
void token_clear(directory_token_t *tok);
int tokenize_string(memarea_t *area,
const char *start, const char *end,
smartlist_t *out,
token_rule_t *table,
int flags);
directory_token_t *get_next_token(memarea_t *area,
const char **s,
const char *eos,
token_rule_t *table);
directory_token_t *find_by_keyword_(smartlist_t *s,
directory_keyword keyword,
const char *keyword_str);
#define find_by_keyword(s, keyword) \
find_by_keyword_((s), (keyword), #keyword)
directory_token_t *find_opt_by_keyword(const smartlist_t *s,
directory_keyword keyword);
smartlist_t * find_all_by_keyword(const smartlist_t *s, directory_keyword k);
#endif /* !defined(TOR_PARSECOMMON_H) */
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