mdw@git.distorted.org.uk Git - secnet/blob - secnet.h

   1 /* Core interface of secnet, to be used by all modules */
   2
   3 #ifndef secnet_h
   4 #define secnet_h
   5
   6 #define ADNS_FEATURE_MANYAF
   7
   8 #include "config.h"
   9 #include <stdlib.h>
  10 #include <stdarg.h>
  11 #include <stdio.h>
  12 #include <string.h>
  13 #include <assert.h>
  14 #include <fcntl.h>
  15 #include <unistd.h>
  16 #include <errno.h>
  17 #include <fnmatch.h>
  18 #include <sys/poll.h>
  19 #include <sys/types.h>
  20 #include <sys/wait.h>
  21 #include <sys/time.h>
  22 #include <netinet/in.h>
  23 #include <arpa/inet.h>
  24
  25 #include <bsd/sys/queue.h>
  26
  27 #define MAX_PEER_ADDRS 5
  28 /* send at most this many copies; honour at most that many addresses */
  29
  30 struct comm_if;
  31 struct comm_addr;
  32
  33 typedef char *string_t;
  34 typedef const char *cstring_t;
  35
  36 #define False (_Bool)0
  37 #define True  (_Bool)1
  38 typedef _Bool bool_t;
  39
  40 union iaddr {
  41     struct sockaddr sa;
  42     struct sockaddr_in sin;
  43 #ifdef CONFIG_IPV6
  44     struct sockaddr_in6 sin6;
  45 #endif
  46 };
  47
  48 #define ASSERT(x) do { if (!(x)) { fatal("assertion failed line %d file " \
  49                                          __FILE__,__LINE__); } } while(0)
  50
  51 /* from version.c */
  52
  53 extern char version[];
  54
  55 /* from logmsg.c */
  56 extern uint32_t message_level;
  57 extern bool_t secnet_is_daemon;
  58 extern struct log_if *system_log;
  59
  60 /* from process.c */
  61 extern void start_signal_handling(void);
  62
  63 void afterfork(void);
  64 /* Must be called before exec in every child made after
  65    start_signal_handling.  Safe to call in earlier children too. */
  66
  67 void childpersist_closefd_hook(void *fd_p, uint32_t newphase);
  68 /* Convenience hook function for use with add_hook PHASE_CHILDPERSIST.
  69    With `int fd' in your state struct, pass fd_p=&fd.  The hook checks
  70    whether fd>=0, so you can use it for an fd which is only sometimes
  71    open.  This function will set fd to -1, so it is idempotent. */
  72
  73 /***** CONFIGURATION support *****/
  74
  75 extern bool_t just_check_config; /* If True then we're going to exit after
  76                                     reading the configuration file */
  77 extern bool_t background; /* If True then we'll eventually run as a daemon */
  78
  79 typedef struct dict dict_t;        /* Configuration dictionary */
  80 typedef struct closure closure_t;
  81 typedef struct item item_t;
  82 typedef struct list list_t;        /* A list of items */
  83
  84 /* Configuration file location, for error-reporting */
  85 struct cloc {
  86     cstring_t file;
  87     int line;
  88 };
  89
  90 /* Modules export closures, which can be invoked from the configuration file.
  91    "Invoking" a closure usually returns another closure (of a different
  92    type), but can actually return any configuration object. */
  93 typedef list_t *(apply_fn)(closure_t *self, struct cloc loc,
  94                            dict_t *context, list_t *data);
  95 struct closure {
  96     cstring_t description; /* For debugging */
  97     uint32_t type; /* Central registry... */
  98     apply_fn *apply;
  99     void *interface; /* Interface for use inside secnet; depends on type */
 100 };
 101
 102 enum types { t_null, t_bool, t_string, t_number, t_dict, t_closure };
 103 struct item {
 104     enum types type;
 105     union {
 106         bool_t bool;
 107         string_t string;
 108         uint32_t number;
 109         dict_t *dict;
 110         closure_t *closure;
 111     } data;
 112     struct cloc loc;
 113 };
 114
 115 /* Note that it is unwise to use this structure directly; use the list
 116    manipulation functions instead. */
 117 struct list {
 118     item_t *item;
 119     struct list *next;
 120 };
 121
 122 /* In the following two lookup functions, NULL means 'not found' */
 123 /* Lookup a value in the specified dictionary, or its parents */
 124 extern list_t *dict_lookup(dict_t *dict, cstring_t key);
 125 /* Lookup a value in just the specified dictionary */
 126 extern list_t *dict_lookup_primitive(dict_t *dict, cstring_t key);
 127 /* Add a value to the specified dictionary */
 128 extern void dict_add(dict_t *dict, cstring_t key, list_t *val);
 129 /* Obtain an array of keys in the dictionary. malloced; caller frees */
 130 extern cstring_t *dict_keys(dict_t *dict);
 131
 132 /* List-manipulation functions */
 133 extern list_t *list_new(void);
 134 extern int32_t list_length(const list_t *a);
 135 extern list_t *list_append(list_t *a, item_t *i);
 136 extern list_t *list_append_list(list_t *a, list_t *b);
 137 /* Returns an item from the list (index starts at 0), or NULL */
 138 extern item_t *list_elem(list_t *l, int32_t index);
 139
 140 /* Convenience functions */
 141 extern list_t *new_closure(closure_t *cl);
 142 extern void add_closure(dict_t *dict, cstring_t name, apply_fn apply);
 143 extern void *find_cl_if(dict_t *dict, cstring_t name, uint32_t type,
 144                         bool_t fail_if_invalid, cstring_t desc,
 145                         struct cloc loc);
 146 extern item_t *dict_find_item(dict_t *dict, cstring_t key, bool_t required,
 147                               cstring_t desc, struct cloc loc);
 148 extern string_t dict_read_string(dict_t *dict, cstring_t key, bool_t required,
 149                                  cstring_t desc, struct cloc loc);
 150 extern uint32_t dict_read_number(dict_t *dict, cstring_t key, bool_t required,
 151                                  cstring_t desc, struct cloc loc,
 152                                  uint32_t def);
 153   /* return value can safely be assigned to int32_t */
 154 extern bool_t dict_read_bool(dict_t *dict, cstring_t key, bool_t required,
 155                              cstring_t desc, struct cloc loc, bool_t def);
 156 const char **dict_read_string_array(dict_t *dict, cstring_t key,
 157                                     bool_t required, cstring_t desc,
 158                                     struct cloc loc, const char *const *def);
 159   /* Return value is a NULL-terminated array obtained from malloc;
 160    * Individual string values are still owned by config file machinery
 161    * and must not be modified or freed.  Returns NULL if key not
 162    * found. */
 163
 164 struct flagstr {
 165     cstring_t name;
 166     uint32_t value;
 167 };
 168 extern uint32_t string_to_word(cstring_t s, struct cloc loc,
 169                                struct flagstr *f, cstring_t desc);
 170 extern uint32_t string_list_to_word(list_t *l, struct flagstr *f,
 171                                     cstring_t desc);
 172
 173 /***** END of configuration support *****/
 174
 175 /***** UTILITY functions *****/
 176
 177 extern char *safe_strdup(const char *string, const char *message);
 178 extern void *safe_malloc(size_t size, const char *message);
 179 extern void *safe_malloc_ary(size_t size, size_t count, const char *message);
 180 extern void *safe_realloc_ary(void *p, size_t size, size_t count,
 181                               const char *message);
 182
 183 #define NEW(p)                                  \
 184     ((p)=safe_malloc(sizeof(*(p)),              \
 185                      __FILE__ ":" #p))
 186 #define NEW_ARY(p,count)                                        \
 187     ((p)=safe_malloc_ary(sizeof(*(p)),(count),                  \
 188                          __FILE__ ":" #p "[" #count "]"))
 189 #define REALLOC_ARY(p,count)                                    \
 190     ((p)=safe_realloc_ary((p),sizeof(*(p)),(count),             \
 191                           __FILE__ ":" #p "[" #count "]"))
 192
 193 void setcloexec(int fd); /* cannot fail */
 194 void setnonblock(int fd); /* cannot fail */
 195 void pipe_cloexec(int fd[2]); /* pipe(), setcloexec() twice; cannot fail */
 196
 197 extern int sys_cmd(const char *file, const char *argc, ...);
 198
 199 extern uint64_t now_global;
 200 extern struct timeval tv_now_global;
 201
 202 static const uint64_t       *const now    = &now_global;
 203 static const struct timeval *const tv_now = &tv_now_global;
 204
 205 /* "now" is current program time, in milliseconds. It is derived
 206    from tv_now. Both are provided by the event loop. */
 207
 208 /***** END of utility functions *****/
 209
 210 /***** START of max_start_pad handling *****/
 211
 212 extern int32_t site_max_start_pad, transform_max_start_pad,
 213     comm_max_start_pad;
 214
 215 void update_max_start_pad(int32_t *our_module_global, int32_t our_instance);
 216 int32_t calculate_max_start_pad(void);
 217
 218 /***** END of max_start_pad handling *****/
 219
 220 /***** SCHEDULING support */
 221
 222 /* If nfds_io is insufficient for your needs, set it to the required
 223    number and return ERANGE. timeout is in milliseconds; if it is too
 224    high then lower it. It starts at -1 (==infinite). */
 225 /* Note that beforepoll_fn may NOT do anything which might change the
 226    fds or timeouts wanted by other registered poll loop loopers.
 227    Callers should make sure of this by not making any calls into other
 228    modules from the beforepoll_fn; the easiest way to ensure this is
 229    for beforepoll_fn to only retreive information and not take any
 230    action.
 231  */
 232 typedef int beforepoll_fn(void *st, struct pollfd *fds, int *nfds_io,
 233                           int *timeout_io);
 234 typedef void afterpoll_fn(void *st, struct pollfd *fds, int nfds);
 235   /* If beforepoll_fn returned ERANGE, afterpoll_fn gets nfds==0.
 236      afterpoll_fn never gets !!(fds[].revents & POLLNVAL) - such
 237      a report is detected as a fatal error by the event loop. */
 238
 239 /* void BEFOREPOLL_WANT_FDS(int want);
 240  *   Expects: int *nfds_io;
 241  *   Can perform non-local exit.
 242  * Checks whether there is space for want fds.  If so, sets *nfds_io.
 243  * If not, sets *nfds_io and returns. */
 244 #define BEFOREPOLL_WANT_FDS(want) do{                           \
 245     if (*nfds_io<(want)) { *nfds_io=(want); return ERANGE; }    \
 246     *nfds_io=(want);                                            \
 247   }while(0)
 248
 249 /* Register interest in the main loop of the program. Before a call
 250    to poll() your supplied beforepoll function will be called. After
 251    the call to poll() the supplied afterpoll function will be called. */
 252 struct poll_interest *register_for_poll(void *st, beforepoll_fn *before,
 253                               afterpoll_fn *after, cstring_t desc);
 254 void deregister_for_poll(struct poll_interest *i);
 255
 256 /***** END of scheduling support */
 257
 258 /***** PROGRAM LIFETIME support */
 259
 260 /* The secnet program goes through a number of phases in its lifetime.
 261    Module code may arrange to be called just as various phases are
 262    entered.
 263
 264    Remember to update the table in util.c if changing the set of
 265    phases. */
 266
 267 enum phase {
 268     PHASE_INIT,
 269     PHASE_GETOPTS,             /* Process command-line arguments */
 270     PHASE_READCONFIG,          /* Parse and process configuration file */
 271     PHASE_SETUP,               /* Process information in configuration */
 272     PHASE_DAEMONIZE,           /* Become a daemon (if necessary) */
 273     PHASE_GETRESOURCES,        /* Obtain all external resources */
 274     PHASE_DROPPRIV,            /* Last chance for privileged operations */
 275     PHASE_RUN,
 276     PHASE_SHUTDOWN,            /* About to die; delete key material, etc. */
 277     PHASE_CHILDPERSIST,        /* Forked long-term child: close fds, etc. */
 278     /* Keep this last: */
 279     NR_PHASES,
 280 };
 281
 282 /* Each module should, in its CHILDPERSIST hooks, close all fds which
 283    constitute ownership of important operating system resources, or
 284    which are used for IPC with other processes who want to get the
 285    usual disconnection effects if the main secnet process dies.
 286    CHILDPERSIST hooks are not run if the child is going to exec;
 287    so fds such as described above should be CLOEXEC too. */
 288
 289 typedef void hook_fn(void *self, uint32_t newphase);
 290 bool_t add_hook(uint32_t phase, hook_fn *f, void *state);
 291 bool_t remove_hook(uint32_t phase, hook_fn *f, void *state);
 292
 293 extern uint32_t current_phase;
 294 extern void enter_phase(uint32_t new_phase);
 295
 296 void phase_hooks_init(void); /* for main() only */
 297 void clear_phase_hooks(uint32_t phase); /* for afterfork() */
 298
 299 /* Some features (like netlink 'soft' routes) require that secnet
 300    retain root privileges.  They should indicate that here when
 301    appropriate. */
 302 extern bool_t require_root_privileges;
 303 extern cstring_t require_root_privileges_explanation;
 304
 305 /* Some modules may want to know whether secnet is going to drop
 306    privilege, so that they know whether to do privsep.  Call only
 307    in phases SETUP and later. */
 308 bool_t will_droppriv(void);
 309
 310 /***** END of program lifetime support *****/
 311
 312 /***** MODULE support *****/
 313
 314 /* Module initialisation function type - modules export one function of
 315    this type which is called to initialise them. For dynamically loaded
 316    modules it's called "secnet_module". */
 317 typedef void init_module(dict_t *dict);
 318
 319 extern void init_builtin_modules(dict_t *dict);
 320
 321 extern init_module resolver_module;
 322 extern init_module random_module;
 323 extern init_module udp_module;
 324 extern init_module polypath_module;
 325 extern init_module util_module;
 326 extern init_module site_module;
 327 extern init_module transform_eax_module;
 328 extern init_module transform_cbcmac_module;
 329 extern init_module netlink_module;
 330 extern init_module rsa_module;
 331 extern init_module dh_module;
 332 extern init_module md5_module;
 333 extern init_module slip_module;
 334 extern init_module tun_module;
 335 extern init_module sha1_module;
 336 extern init_module log_module;
 337
 338 /***** END of module support *****/
 339
 340 /***** CLOSURE TYPES and interface definitions *****/
 341
 342 #define CL_PURE         0
 343 #define CL_RESOLVER     1
 344 #define CL_RANDOMSRC    2
 345 #define CL_RSAPUBKEY    3
 346 #define CL_RSAPRIVKEY   4
 347 #define CL_COMM         5
 348 #define CL_IPIF         6
 349 #define CL_LOG          7
 350 #define CL_SITE         8
 351 #define CL_TRANSFORM    9
 352 #define CL_DH          11
 353 #define CL_HASH        12
 354 #define CL_BUFFER      13
 355 #define CL_NETLINK     14
 356
 357 struct buffer_if;
 358
 359 /* PURE closure requires no interface */
 360
 361 /* RESOLVER interface */
 362
 363 /* Answers to queries are delivered to a function of this
 364    type. 'address' will be NULL if there was a problem with the query. It
 365    will be freed once resolve_answer_fn returns.  naddrs is the actual
 366    size of the array at addrs; was_naddrs is the number of addresses
 367    actually found in the DNS, which may be bigger if addrs is equal
 368    to MAX_PEER_ADDRS (ie there were too many). */
 369 typedef void resolve_answer_fn(void *st, const struct comm_addr *addrs,
 370                                int naddrs, int was_naddrs,
 371                                const char *name, const char *failwhy);
 372   /* name is the same ptr as passed to request, so its lifetime must
 373    * be suitable*/
 374 typedef bool_t resolve_request_fn(void *st, cstring_t name,
 375                                   int remoteport, struct comm_if *comm,
 376                                   resolve_answer_fn *cb, void *cst);
 377 struct resolver_if {
 378     void *st;
 379     resolve_request_fn *request;
 380 };
 381
 382 /* RANDOMSRC interface */
 383
 384 /* Return some random data. Returns TRUE for success. */
 385 typedef bool_t random_fn(void *st, int32_t bytes, uint8_t *buff);
 386
 387 struct random_if {
 388     void *st;
 389     bool_t blocking;
 390     random_fn *generate;
 391 };
 392
 393 /* RSAPUBKEY interface */
 394
 395 typedef bool_t rsa_checksig_fn(void *st, uint8_t *data, int32_t datalen,
 396                                cstring_t signature);
 397 struct rsapubkey_if {
 398     void *st;
 399     rsa_checksig_fn *check;
 400 };
 401
 402 /* RSAPRIVKEY interface */
 403
 404 typedef string_t rsa_makesig_fn(void *st, uint8_t *data, int32_t datalen);
 405 struct rsaprivkey_if {
 406     void *st;
 407     rsa_makesig_fn *sign;
 408 };
 409
 410 /* COMM interface */
 411
 412 struct comm_addr {
 413     /* This struct is pure data; in particular comm's clients may
 414        freely copy it. */
 415     struct comm_if *comm;
 416     union iaddr ia;
 417     int ix; /* see comment `Re comm_addr.ix' in udp.c */
 418 };
 419
 420 /* Return True if the packet was processed, and shouldn't be passed to
 421    any other potential receivers. (buf is freed iff True returned.) */
 422 typedef bool_t comm_notify_fn(void *state, struct buffer_if *buf,
 423                               const struct comm_addr *source);
 424 typedef void comm_request_notify_fn(void *commst, void *nst,
 425                                     comm_notify_fn *fn);
 426 typedef void comm_release_notify_fn(void *commst, void *nst,
 427                                     comm_notify_fn *fn);
 428 typedef bool_t comm_sendmsg_fn(void *commst, struct buffer_if *buf,
 429                                const struct comm_addr *dest);
 430   /* Only returns false if (we know that) the local network
 431    * environment is such that this address cannot work; transient
 432    * or unknown/unexpected failures return true. */
 433 typedef const char *comm_addr_to_string_fn(void *commst,
 434                                            const struct comm_addr *ca);
 435         /* Returned string is in a static buffer. */
 436 struct comm_if {
 437     void *st;
 438     comm_request_notify_fn *request_notify;
 439     comm_release_notify_fn *release_notify;
 440     comm_sendmsg_fn *sendmsg;
 441     comm_addr_to_string_fn *addr_to_string;
 442 };
 443
 444 bool_t iaddr_equal(const union iaddr *ia, const union iaddr *ib,
 445                    bool_t ignoreport);
 446
 447 static inline const char *comm_addr_to_string(const struct comm_addr *ca)
 448 {
 449     return ca->comm->addr_to_string(ca->comm->st, ca);
 450 }
 451
 452 static inline bool_t comm_addr_equal(const struct comm_addr *a,
 453                                      const struct comm_addr *b)
 454 {
 455     return a->comm==b->comm && iaddr_equal(&a->ia,&b->ia,False);
 456 }
 457
 458 /* LOG interface */
 459
 460 #define LOG_MESSAGE_BUFLEN 1023
 461
 462 typedef void log_msg_fn(void *st, int class, const char *message, ...);
 463 typedef void log_vmsg_fn(void *st, int class, const char *message,
 464                          va_list args);
 465 struct log_if {
 466     void *st;
 467     log_vmsg_fn *vlogfn; /* printf format checking.  Use [v]slilog instead */
 468     char buff[LOG_MESSAGE_BUFLEN+1];
 469 };
 470 /* (convenience functions, defined in util.c) */
 471 extern void slilog(struct log_if *lf, int class, const char *message, ...)
 472 FORMAT(printf,3,4);
 473 extern void vslilog(struct log_if *lf, int class, const char *message, va_list)
 474 FORMAT(printf,3,0);
 475
 476 /* Versions which take (parts of) (multiple) messages, using \n to
 477  * distinguish one message from another. */
 478 extern void slilog_part(struct log_if *lf, int class, const char *message, ...)
 479 FORMAT(printf,3,4);
 480 extern void vslilog_part(struct log_if *lf, int class, const char *message,
 481                          va_list) FORMAT(printf,3,0);
 482
 483 /* SITE interface */
 484
 485 /* Pretty much a placeholder; allows starting and stopping of processing,
 486    key expiry, etc. */
 487 typedef void site_control_fn(void *st, bool_t run);
 488 typedef uint32_t site_status_fn(void *st);
 489 struct site_if {
 490     void *st;
 491     site_control_fn *control;
 492     site_status_fn *status;
 493 };
 494
 495 /* TRANSFORM interface */
 496
 497 /* A reversable transformation. Transforms buffer in-place; may add
 498    data to start or end. (Reverse transformations decrease
 499    length, of course.)  Transformations may be key-dependent, in which
 500    case key material is passed in at initialisation time. They may
 501    also depend on internal factors (eg. time) and keep internal
 502    state. A struct transform_if only represents a particular type of
 503    transformation; instances of the transformation (eg. with
 504    particular key material) have a different C type. The same
 505    secret key will be used in opposite directions between a pair of
 506    secnets; one of these pairs will get direction==False, the other True. */
 507
 508 typedef struct transform_inst_if *transform_createinstance_fn(void *st);
 509 typedef bool_t transform_setkey_fn(void *st, uint8_t *key, int32_t keylen,
 510                                    bool_t direction);
 511 typedef bool_t transform_valid_fn(void *st); /* 0: no key; 1: ok */
 512 typedef void transform_delkey_fn(void *st);
 513 typedef void transform_destroyinstance_fn(void *st);
 514 /* Returns:
 515  *   0: all is well
 516  *   1: for any other problem
 517  *   2: message decrypted but sequence number was out of range
 518  */
 519 typedef uint32_t transform_apply_fn(void *st, struct buffer_if *buf,
 520                                     const char **errmsg);
 521
 522 struct transform_inst_if {
 523     void *st;
 524     transform_setkey_fn *setkey;
 525     transform_valid_fn *valid;
 526     transform_delkey_fn *delkey;
 527     transform_apply_fn *forwards;
 528     transform_apply_fn *reverse;
 529     transform_destroyinstance_fn *destroy;
 530 };
 531
 532 struct transform_if {
 533     void *st;
 534     int capab_transformnum;
 535     int32_t keylen; /* <<< INT_MAX */
 536     transform_createinstance_fn *create;
 537 };
 538
 539 /* NETLINK interface */
 540
 541 /* Used by netlink to deliver to site, and by site to deliver to
 542    netlink.  cid is the client identifier returned by
 543    netlink_regnets_fn.  If buf has size 0 then the function is just
 544    being called for its site-effects (eg. making the site code attempt
 545    to bring up a network link) */
 546 typedef void netlink_deliver_fn(void *st, struct buffer_if *buf);
 547 /* site code can tell netlink when outgoing packets will be dropped,
 548    so netlink can generate appropriate ICMP and make routing decisions */
 549 #define LINK_QUALITY_UNUSED 0   /* This link is unused, do not make this netlink */
 550 #define LINK_QUALITY_DOWN 1   /* No chance of a packet being delivered right away*/
 551 #define LINK_QUALITY_DOWN_STALE_ADDRESS 2 /* Link down, old address information */
 552 #define LINK_QUALITY_DOWN_CURRENT_ADDRESS 3 /* Link down, current address information */
 553 #define LINK_QUALITY_UP 4     /* Link active */
 554 #define MAXIMUM_LINK_QUALITY 3
 555 typedef void netlink_link_quality_fn(void *st, uint32_t quality);
 556 typedef void netlink_register_fn(void *st, netlink_deliver_fn *deliver,
 557                                  void *dst, uint32_t *localmtu_r /* NULL ok */);
 558 typedef void netlink_output_config_fn(void *st, struct buffer_if *buf);
 559 typedef bool_t netlink_check_config_fn(void *st, struct buffer_if *buf);
 560 typedef void netlink_set_mtu_fn(void *st, int32_t new_mtu);
 561 struct netlink_if {
 562     void *st;
 563     netlink_register_fn *reg;
 564     netlink_deliver_fn *deliver;
 565     netlink_link_quality_fn *set_quality;
 566     netlink_set_mtu_fn *set_mtu;
 567 };
 568
 569 /* DH interface */
 570
 571 /* Returns public key as a malloced hex string */
 572 typedef string_t dh_makepublic_fn(void *st, uint8_t *secret,
 573                                   int32_t secretlen);
 574 /* Fills buffer (up to buflen) with shared secret */
 575 typedef void dh_makeshared_fn(void *st, uint8_t *secret,
 576                               int32_t secretlen, cstring_t rempublic,
 577                               uint8_t *sharedsecret, int32_t buflen);
 578 struct dh_if {
 579     void *st;
 580     int32_t len; /* Approximate size of modulus in bytes */
 581     int32_t ceil_len; /* Number of bytes just sufficient to contain modulus */
 582     dh_makepublic_fn *makepublic;
 583     dh_makeshared_fn *makeshared;
 584 };
 585
 586 /* HASH interface */
 587
 588 typedef void *hash_init_fn(void);
 589 typedef void hash_update_fn(void *st, const void *buf, int32_t len);
 590 typedef void hash_final_fn(void *st, uint8_t *digest);
 591 struct hash_if {
 592     int32_t len; /* Hash output length in bytes */
 593     hash_init_fn *init;
 594     hash_update_fn *update;
 595     hash_final_fn *final;
 596 };
 597
 598 /* BUFFER interface */
 599
 600 struct buffer_if {
 601     bool_t free;
 602     cstring_t owner; /* Set to constant string */
 603     uint32_t flags; /* How paranoid should we be? */
 604     struct cloc loc; /* Where we were defined */
 605     uint8_t *base;
 606     uint8_t *start;
 607     int32_t size; /* Size of buffer contents */
 608     int32_t alloclen; /* Total length allocated at base */
 609 };
 610
 611 /***** LOG functions *****/
 612
 613 #define M_DEBUG_CONFIG 0x001
 614 #define M_DEBUG_PHASE  0x002
 615 #define M_DEBUG        0x004
 616 #define M_INFO         0x008
 617 #define M_NOTICE       0x010
 618 #define M_WARNING      0x020
 619 #define M_ERR          0x040
 620 #define M_SECURITY     0x080
 621 #define M_FATAL        0x100
 622
 623 /* The fatal() family of functions require messages that do not end in '\n' */
 624 extern NORETURN(fatal(const char *message, ...)) FORMAT(printf,1,2);
 625 extern NORETURN(fatal_perror(const char *message, ...)) FORMAT(printf,1,2);
 626 extern NORETURN(fatal_status(int status, const char *message, ...))
 627        FORMAT(printf,2,3);
 628 extern NORETURN(fatal_perror_status(int status, const char *message, ...))
 629        FORMAT(printf,2,3);
 630
 631 /* Convenient nonfatal logging.  Requires message that does not end in '\n'.
 632  * If class contains M_FATAL, exits (after entering PHASE_SHUTDOWN).
 633  * lg, errnoval and loc may sensibly be 0.  desc must NOT be 0.
 634  * lg_[v]perror save and restore errno. */
 635 void lg_vperror(struct log_if *lg, const char *desc, struct cloc *loc,
 636                 int class, int errnoval, const char *fmt, va_list al)
 637     FORMAT(printf,6,0);
 638 void lg_perror(struct log_if *lg, const char *desc, struct cloc *loc,
 639                int class, int errnoval, const char *fmt, ...)
 640     FORMAT(printf,6,7);
 641 void lg_exitstatus(struct log_if *lg, const char *desc, struct cloc *loc,
 642                    int class, int status, const char *progname);
 643
 644 /* The cfgfatal() family of functions require messages that end in '\n' */
 645 extern NORETURN(cfgfatal(struct cloc loc, cstring_t facility,
 646                          const char *message, ...)) FORMAT(printf,3,4);
 647 extern void cfgfile_postreadcheck(struct cloc loc, FILE *f);
 648 extern NORETURN(vcfgfatal_maybefile(FILE *maybe_f, struct cloc loc,
 649                                     cstring_t facility, const char *message,
 650                                     va_list))
 651     FORMAT(printf,4,0);
 652 extern NORETURN(cfgfatal_maybefile(FILE *maybe_f, struct cloc loc,
 653                                    cstring_t facility,
 654                                    const char *message, ...))
 655     FORMAT(printf,4,5);
 656
 657 extern void Message(uint32_t class, const char *message, ...)
 658     FORMAT(printf,2,3);
 659 extern void log_from_fd(int fd, cstring_t prefix, struct log_if *log);
 660
 661 /***** END of log functions *****/
 662
 663 #define STRING2(x) #x
 664 #define STRING(x) STRING2(x)
 665
 666 #define FILLZERO(obj) (memset(&(obj),0,sizeof((obj))))
 667 #define ARRAY_SIZE(ary) (sizeof((ary))/sizeof((ary)[0]))
 668
 669 /*
 670  * void COPY_OBJ(  OBJECT& dst, const OBJECT& src);
 671  * void COPY_ARRAY(OBJECT *dst, const OBJECT *src, INTEGER count);
 672  *   // Typesafe: we check that the type OBJECT is the same in both cases.
 673  *   // It is OK to use COPY_OBJ on an array object, provided it's
 674  *   // _actually_ the whole array object and not decayed into a
 675  *   // pointer (e.g. a formal parameter).
 676  */
 677 #define COPY_OBJ(dst,src) \
 678     (&(dst)==&(src), memcpy(&(dst),&(src),sizeof((dst))))
 679 #define COPY_ARRAY(dst,src,count) \
 680     (&(dst)[0]==&(src)[0], memcpy((dst),(src),sizeof((dst)[0])*(count)))
 681
 682 #endif /* secnet_h */