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Diffstat (limited to 'src/or/parsecommon.h')
| -rw-r--r-- | src/or/parsecommon.h | 315 |
1 files changed, 315 insertions, 0 deletions
diff --git a/src/or/parsecommon.h b/src/or/parsecommon.h new file mode 100644 index 0000000000..15e9f7ae85 --- /dev/null +++ b/src/or/parsecommon.h @@ -0,0 +1,315 @@ +/* Copyright (c) 2016, 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_AUTHENTICATION_REQUIRED, + R3_SINGLE_ONION_SERVICE, + R3_INTRODUCTION_POINT, + R3_INTRO_AUTH_KEY, + R3_INTRO_ENC_KEY, + R3_INTRO_ENC_KEY_CERTIFICATION, + + 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(smartlist_t *s, + directory_keyword keyword); +smartlist_t * find_all_by_keyword(smartlist_t *s, directory_keyword k); + +#endif /* TOR_PARSECOMMON_H */ + |