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