3 * Main header file for TrIPE
5 * (c) 2001 Straylight/Edgeware
8 /*----- Licensing notice --------------------------------------------------*
10 * This file is part of Trivial IP Encryption (TrIPE).
12 * TrIPE is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or
15 * (at your option) any later version.
17 * TrIPE is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
22 * You should have received a copy of the GNU General Public License
23 * along with TrIPE; if not, write to the Free Software Foundation,
24 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
34 /*----- Header files ------------------------------------------------------*/
50 #include <sys/types.h>
56 #include <sys/socket.h>
58 #include <netinet/in.h>
59 #include <arpa/inet.h>
65 #include <mLib/alloc.h>
66 #include <mLib/arena.h>
67 #include <mLib/base64.h>
68 #include <mLib/bres.h>
69 #include <mLib/daemonize.h>
70 #include <mLib/dstr.h>
72 #include <mLib/fdflags.h>
73 #include <mLib/fwatch.h>
74 #include <mLib/hash.h>
75 #include <mLib/macros.h>
76 #include <mLib/mdwopt.h>
77 #include <mLib/quis.h>
78 #include <mLib/report.h>
80 #include <mLib/selbuf.h>
84 #include <mLib/trace.h>
86 #include <mLib/versioncmp.h>
88 #include <catacomb/buf.h>
90 #include <catacomb/gcipher.h>
91 #include <catacomb/gmac.h>
92 #include <catacomb/grand.h>
93 #include <catacomb/key.h>
94 #include <catacomb/paranoia.h>
96 #include <catacomb/noise.h>
97 #include <catacomb/rand.h>
99 #include <catacomb/mp.h>
100 #include <catacomb/mprand.h>
101 #include <catacomb/dh.h>
102 #include <catacomb/ec.h>
103 #include <catacomb/ec-keys.h>
104 #include <catacomb/group.h>
106 #include "protocol.h"
112 /*----- Magic numbers -----------------------------------------------------*/
114 /* --- Trace flags --- */
122 #define T_KEYEXCH 64u
123 #define T_KEYMGMT 128u
130 #define SEC(n) (n##u)
131 #define MIN(n) (n##u * 60u)
132 #define MEG(n) (n##ul * 1024ul * 1024ul)
134 /* --- Other things --- */
136 #define PKBUFSZ 65536
138 /*----- Cipher selections -------------------------------------------------*/
140 typedef struct algswitch {
141 const gccipher *c; /* Symmetric encryption scheme */
142 const gccipher *mgf; /* Mask-generation function */
143 const gchash *h; /* Hash function */
144 const gcmac *m; /* Message authentication code */
145 size_t hashsz; /* Hash output size */
146 size_t tagsz; /* Length to truncate MAC tags */
147 size_t cksz, mksz; /* Key lengths for @c@ and @m@ */
150 extern algswitch algs;
152 #define MAXHASHSZ 64 /* Largest possible hash size */
154 #define HASH_STRING(h, s) GH_HASH((h), (s), sizeof(s))
156 /*----- Data structures ---------------------------------------------------*/
158 /* --- Socket addresses --- *
160 * A magic union of supported socket addresses.
165 struct sockaddr_in sin;
168 /* --- Mapping keyed on addresses --- */
170 typedef struct addrmap {
175 typedef struct addrmap_base {
180 /* --- Sequence number checking --- */
182 typedef struct seqwin {
183 uint32 seq; /* First acceptable input sequence */
184 uint32 win; /* Window of acceptable numbers */
187 #define SEQ_WINSZ 32 /* Bits in sequence number window */
189 /* --- A symmetric keyset --- *
191 * A keyset contains a set of symmetric keys for encrypting and decrypting
192 * packets. Keysets are stored in a list, sorted in reverse order of
193 * creation, so that the most recent keyset (the one most likely to be used)
196 * Each keyset has a time limit and a data limit. The keyset is destroyed
197 * when either it has existed for too long, or it has been used to encrypt
198 * too much data. New key exchanges are triggered when keys are close to
202 typedef struct keyset {
203 struct keyset *next; /* Next active keyset in the list */
204 unsigned ref; /* Reference count for keyset */
205 struct peer *p; /* Pointer to peer structure */
206 time_t t_exp; /* Expiry time for this keyset */
207 unsigned long sz_exp; /* Data limit for the keyset */
208 T( unsigned seq; ) /* Sequence number for tracing */
209 unsigned f; /* Various useful flags */
210 gcipher *cin, *cout; /* Keyset ciphers for encryption */
211 size_t tagsz; /* Length to truncate MAC tags */
212 gmac *min, *mout; /* Keyset MACs for integrity */
213 uint32 oseq; /* Outbound sequence number */
214 seqwin iseq; /* Inbound sequence number */
217 #define KSF_LISTEN 1u /* Don't encrypt packets yet */
218 #define KSF_LINK 2u /* Key is in a linked list */
220 /* --- Key exchange --- *
222 * TrIPE uses the Wrestlers Protocol for its key exchange. The Wrestlers
223 * Protocol has a number of desirable features (e.g., perfect forward
224 * secrecy, and zero-knowledge authentication) which make it attractive for
225 * use in TrIPE. The Wrestlers Protocol was designed by Mark Wooding and
231 typedef struct kxchal {
232 struct keyexch *kx; /* Pointer back to key exchange */
233 ge *c; /* Responder's challenge */
234 ge *r; /* My reply to the challenge */
235 keyset *ks; /* Pointer to temporary keyset */
236 unsigned f; /* Various useful flags */
237 sel_timer t; /* Response timer for challenge */
238 octet hc[MAXHASHSZ]; /* Hash of his challenge */
239 octet ck[MAXHASHSZ]; /* His magical check value */
240 octet hswrq_in[MAXHASHSZ]; /* Inbound switch request message */
241 octet hswok_in[MAXHASHSZ]; /* Inbound switch confirmation */
242 octet hswrq_out[MAXHASHSZ]; /* Outbound switch request message */
243 octet hswok_out[MAXHASHSZ]; /* Outbound switch confirmation */
246 typedef struct keyexch {
247 struct peer *p; /* Pointer back to the peer */
248 keyset **ks; /* Peer's list of keysets */
249 unsigned f; /* Various useful flags */
250 unsigned s; /* Current state in exchange */
251 sel_timer t; /* Timer for next exchange */
252 ge *kpub; /* Peer's public key */
253 time_t texp_kpub; /* Expiry time for public key */
254 mp *alpha; /* My temporary secret */
255 ge *c; /* My challenge */
256 ge *rx; /* The expected response */
257 unsigned nr; /* Number of extant responses */
258 time_t t_valid; /* When this exchange goes bad */
259 octet hc[MAXHASHSZ]; /* Hash of my challenge */
260 kxchal *r[KX_NCHAL]; /* Array of challenges */
263 #define KXF_TIMER 1u /* Waiting for a timer to go off */
264 #define KXF_DEAD 2u /* The key-exchanger isn't up */
265 #define KXF_PUBKEY 4u /* Key exchanger has a public key */
266 #define KXF_CORK 8u /* Don't send anything yet */
269 KXS_DEAD, /* Uninitialized state (magical) */
270 KXS_CHAL, /* Main answer-challenges state */
271 KXS_COMMIT, /* Committed: send switch request */
272 KXS_SWITCH /* Switched: send confirmation */
275 /* --- Tunnel structure --- *
277 * Used to maintain system-specific information about the tunnel interface.
280 typedef struct tunnel tunnel;
283 typedef struct tunnel_ops {
284 const char *name; /* Name of this tunnel driver */
285 void (*init)(void); /* Initializes the system */
286 tunnel *(*create)(struct peer */*p*/, char **/*ifn*/);
287 /* Initializes a new tunnel */
288 void (*setifname)(tunnel */*t*/, const char */*ifn*/);
289 /* Notifies ifname change */
290 void (*inject)(tunnel */*t*/, buf */*b*/); /* Sends packet through if */
291 void (*destroy)(tunnel */*t*/); /* Destroys a tunnel */
294 #ifndef TUN_INTERNALS
295 struct tunnel { const tunnel_ops *ops; };
298 /* --- Peer statistics --- *
300 * Contains various interesting and not-so-interesting statistics about a
301 * peer. This is updated by various parts of the code. The format of the
302 * structure isn't considered private, and @p_stats@ returns a pointer to the
303 * statistics block for a given peer.
306 typedef struct stats {
307 unsigned long sz_in, sz_out; /* Size of all data in and out */
308 unsigned long sz_kxin, sz_kxout; /* Size of key exchange messages */
309 unsigned long sz_ipin, sz_ipout; /* Size of encapsulated IP packets */
310 time_t t_start, t_last, t_kx; /* Time peer created, last pk, kx */
311 unsigned long n_reject; /* Number of rejected packets */
312 unsigned long n_in, n_out; /* Number of packets in and out */
313 unsigned long n_kxin, n_kxout; /* Number of key exchange packets */
314 unsigned long n_ipin, n_ipout; /* Number of encrypted packets */
317 /* --- Peer structure --- *
319 * The main structure which glues everything else together.
322 typedef struct peerspec {
323 char *name; /* Peer's name */
324 const tunnel_ops *tops; /* Tunnel operations */
325 unsigned long t_ka; /* Keep alive interval */
326 addr sa; /* Socket address to speak to */
327 size_t sasz; /* Socket address size */
328 unsigned kxf; /* Key exchange flags to set */
331 typedef struct peer_byname {
336 typedef struct peer_byaddr {
341 typedef struct peer {
342 peer_byname *byname; /* Lookup-by-name block */
343 peer_byaddr *byaddr; /* Lookup-by-address block */
344 struct ping *pings; /* Pings we're waiting for */
345 peerspec spec; /* Specifications for this peer */
346 tunnel *t; /* Tunnel for local packets */
347 char *ifname; /* Interface name for tunnel */
348 keyset *ks; /* List head for keysets */
349 buf b; /* Buffer for sending packets */
350 stats st; /* Statistics */
351 keyexch kx; /* Key exchange protocol block */
352 sel_timer tka; /* Timer for keepalives */
355 typedef struct peer_iter { sym_iter i; } peer_iter;
357 typedef struct ping {
358 struct ping *next, *prev; /* Links to next and previous */
359 peer *p; /* Peer so we can free it */
360 unsigned msg; /* Kind of response expected */
361 uint32 id; /* Id so we can recognize response */
362 octet magic[32]; /* Some random data */
363 sel_timer t; /* Timeout for ping */
364 void (*func)(int /*rc*/, void */*arg*/); /* Function to call when done */
365 void *arg; /* Argument for callback */
376 /* --- Admin structure --- */
378 #define OBUFSZ 16384u
380 typedef struct obuf {
381 struct obuf *next; /* Next buffer in list */
382 char *p_in, *p_out; /* Pointers into the buffer */
383 char buf[OBUFSZ]; /* The actual buffer */
386 typedef struct oqueue {
387 obuf *hd, *tl; /* Head and tail pointers */
392 typedef struct admin_bgop {
393 struct admin_bgop *next, *prev; /* Links to next and previous */
394 struct admin *a; /* Owner job */
395 char *tag; /* Tag string for messages */
396 void (*cancel)(struct admin_bgop *); /* Destructor function */
399 typedef struct admin_resop {
400 admin_bgop bg; /* Background operation header */
401 char *addr; /* Hostname to be resolved */
402 bres_client r; /* Background resolver task */
403 sel_timer t; /* Timer for resolver */
404 addr sa; /* Socket address */
405 size_t sasz; /* Socket address size */
406 void (*func)(struct admin_resop *, int); /* Handler */
409 enum { ARES_OK, ARES_FAIL };
411 typedef struct admin_addop {
412 admin_resop r; /* Name resolution header */
413 peerspec peer; /* Peer pending creation */
416 typedef struct admin_greetop {
417 admin_resop r; /* Name resolution header */
418 void *c; /* Challenge block */
419 size_t sz; /* Length of challenge */
422 typedef struct admin_pingop {
423 admin_bgop bg; /* Background operation header */
424 ping ping; /* Ping pending response */
425 struct timeval pingtime; /* Time last ping was sent */
428 typedef struct admin_service {
429 sym_base _b; /* Hash table base structure */
430 char *version; /* The provided version */
431 struct admin *prov; /* Which client provides me */
432 struct admin_service *next, *prev; /* Client's list of services */
435 typedef struct admin_svcop {
436 admin_bgop bg; /* Background operation header */
437 struct admin *prov; /* Client servicing this job */
438 unsigned index; /* This job's index */
439 struct admin_svcop *next, *prev; /* Links for provider's jobs */
442 typedef struct admin_jobentry {
443 unsigned short seq; /* Zero if unused */
445 admin_svcop *op; /* Operation, if slot in use, ... */
446 uint32 next; /* ... or index of next free slot */
450 typedef struct admin_jobtable {
451 uint32 n, sz; /* Used slots and table size */
452 admin_svcop *active; /* List of active jobs */
453 uint32 free; /* Index of first free slot */
454 admin_jobentry *v; /* And the big array of entries */
457 typedef struct admin {
458 struct admin *next, *prev; /* Links to next and previous */
459 unsigned f; /* Various useful flags */
460 unsigned ref; /* Reference counter */
462 unsigned seq; /* Sequence number for tracing */
464 oqueue out; /* Output buffer list */
465 oqueue delay; /* Delayed output buffer list */
466 admin_bgop *bg; /* Backgrounded operations */
467 admin_service *svcs; /* Which services I provide */
468 admin_jobtable j; /* Table of outstanding jobs */
469 selbuf b; /* Line buffer for commands */
470 sel_file w; /* Selector for write buffering */
473 #define AF_DEAD 1u /* Destroy this admin block */
474 #define AF_CLOSE 2u /* Client closed connection */
475 #define AF_NOTE 4u /* Catch notifications */
476 #define AF_WARN 8u /* Catch warning messages */
478 #define AF_TRACE 16u /* Catch tracing */
480 #define AF_FOREGROUND 32u /* Quit server when client closes */
483 # define AF_ALLMSGS (AF_NOTE | AF_TRACE | AF_WARN)
485 # define AF_ALLMSGS (AF_NOTE | AF_WARN)
488 /*----- Global variables --------------------------------------------------*/
490 extern sel_state sel; /* Global I/O event state */
491 extern group *gg; /* The group we work in */
492 extern size_t indexsz; /* Size of exponent for the group */
493 extern mp *kpriv; /* Our private key */
494 extern ge *kpub; /* Our public key */
495 extern octet buf_i[PKBUFSZ], buf_o[PKBUFSZ], buf_t[PKBUFSZ], buf_u[PKBUFSZ];
496 extern const tunnel_ops *tunnels[]; /* Table of tunnels (0-term) */
497 extern const tunnel_ops *tun_default; /* Default tunnel to use */
500 extern const trace_opt tr_opts[]; /* Trace options array */
501 extern unsigned tr_flags; /* Trace options flags */
504 /*----- Other macros ------------------------------------------------------*/
506 #define TIMER noise_timer(RAND_GLOBAL)
508 /*----- Key management ----------------------------------------------------*/
510 /* --- @km_reload@ --- *
514 * Returns: Zero if OK, nonzero to force reloading of keys.
516 * Use: Checks the keyrings to see if they need reloading.
519 extern int km_reload(void);
521 /* --- @km_init@ --- *
523 * Arguments: @const char *kr_priv@ = private keyring file
524 * @const char *kr_pub@ = public keyring file
525 * @const char *tag@ = tag to load
529 * Use: Initializes, and loads the private key.
532 extern void km_init(const char */*kr_priv*/, const char */*kr_pub*/,
533 const char */*tag*/);
535 /* --- @km_getpubkey@ --- *
537 * Arguments: @const char *tag@ = public key tag to load
538 * @ge *kpub@ = where to put the public key
539 * @time_t *t_exp@ = where to put the expiry time
541 * Returns: Zero if OK, nonzero if it failed.
543 * Use: Fetches a public key from the keyring.
546 extern int km_getpubkey(const char */*tag*/, ge */*kpub*/,
549 /*----- Key exchange ------------------------------------------------------*/
551 /* --- @kx_start@ --- *
553 * Arguments: @keyexch *kx@ = pointer to key exchange context
554 * @int forcep@ = nonzero to ignore the quiet timer
558 * Use: Stimulates a key exchange. If a key exchage is in progress,
559 * a new challenge is sent (unless the quiet timer forbids
560 * this); if no exchange is in progress, one is commenced.
563 extern void kx_start(keyexch */*kx*/, int /*forcep*/);
565 /* --- @kx_message@ --- *
567 * Arguments: @keyexch *kx@ = pointer to key exchange context
568 * @unsigned msg@ = the message code
569 * @buf *b@ = pointer to buffer containing the packet
573 * Use: Reads a packet containing key exchange messages and handles
577 extern void kx_message(keyexch */*kx*/, unsigned /*msg*/, buf */*b*/);
579 /* --- @kx_free@ --- *
581 * Arguments: @keyexch *kx@ = pointer to key exchange context
585 * Use: Frees everything in a key exchange context.
588 extern void kx_free(keyexch */*kx*/);
590 /* --- @kx_newkeys@ --- *
592 * Arguments: @keyexch *kx@ = pointer to key exchange context
596 * Use: Informs the key exchange module that its keys may have
597 * changed. If fetching the new keys fails, the peer will be
598 * destroyed, we log messages and struggle along with the old
602 extern void kx_newkeys(keyexch */*kx*/);
604 /* --- @kx_init@ --- *
606 * Arguments: @keyexch *kx@ = pointer to key exchange context
607 * @peer *p@ = pointer to peer context
608 * @keyset **ks@ = pointer to keyset list
609 * @unsigned f@ = various useful flags
611 * Returns: Zero if OK, nonzero if it failed.
613 * Use: Initializes a key exchange module. The module currently
614 * contains no keys, and will attempt to initiate a key
618 extern int kx_init(keyexch */*kx*/, peer */*p*/,
619 keyset **/*ks*/, unsigned /*f*/);
621 /*----- Keysets and symmetric cryptography --------------------------------*/
623 /* --- @ks_drop@ --- *
625 * Arguments: @keyset *ks@ = pointer to a keyset
629 * Use: Decrements a keyset's reference counter. If the counter hits
630 * zero, the keyset is freed.
633 extern void ks_drop(keyset */*ks*/);
635 /* --- @ks_gen@ --- *
637 * Arguments: @const void *k@ = pointer to key material
638 * @size_t x, y, z@ = offsets into key material (see below)
639 * @peer *p@ = pointer to peer information
641 * Returns: A pointer to the new keyset.
643 * Use: Derives a new keyset from the given key material. The
644 * offsets @x@, @y@ and @z@ separate the key material into three
645 * parts. Between the @k@ and @k + x@ is `my' contribution to
646 * the key material; between @k + x@ and @k + y@ is `your'
647 * contribution; and between @k + y@ and @k + z@ is a shared
648 * value we made together. These are used to construct two
649 * pairs of symmetric keys. Each pair consists of an encryption
650 * key and a message authentication key. One pair is used for
651 * outgoing messages, the other for incoming messages.
653 * The new key is marked so that it won't be selected for output
654 * by @ksl_encrypt@. You can still encrypt data with it by
655 * calling @ks_encrypt@ directly.
658 extern keyset *ks_gen(const void */*k*/,
659 size_t /*x*/, size_t /*y*/, size_t /*z*/,
662 /* --- @ks_tregen@ --- *
664 * Arguments: @keyset *ks@ = pointer to a keyset
666 * Returns: The time at which moves ought to be made to replace this key.
669 extern time_t ks_tregen(keyset */*ks*/);
671 /* --- @ks_activate@ --- *
673 * Arguments: @keyset *ks@ = pointer to a keyset
677 * Use: Activates a keyset, so that it can be used for encrypting
681 extern void ks_activate(keyset */*ks*/);
683 /* --- @ks_encrypt@ --- *
685 * Arguments: @keyset *ks@ = pointer to a keyset
686 * @unsigned ty@ = message type
687 * @buf *b@ = pointer to input buffer
688 * @buf *bb@ = pointer to output buffer
690 * Returns: Zero if OK, nonzero if the key needs replacing. If the
691 * encryption failed, the output buffer is broken and zero is
694 * Use: Encrypts a block of data using the key. Note that the `key
695 * ought to be replaced' notification is only ever given once
696 * for each key. Also note that this call forces a keyset to be
697 * used even if it's marked as not for data output.
700 extern int ks_encrypt(keyset */*ks*/, unsigned /*ty*/,
701 buf */*b*/, buf */*bb*/);
703 /* --- @ks_decrypt@ --- *
705 * Arguments: @keyset *ks@ = pointer to a keyset
706 * @unsigned ty@ = expected type code
707 * @buf *b@ = pointer to an input buffer
708 * @buf *bb@ = pointer to an output buffer
710 * Returns: Zero on success, or nonzero if there was some problem.
712 * Use: Attempts to decrypt a message using a given key. Note that
713 * requesting decryption with a key directly won't clear a
714 * marking that it's not for encryption.
717 extern int ks_decrypt(keyset */*ks*/, unsigned /*ty*/,
718 buf */*b*/, buf */*bb*/);
720 /* --- @ksl_free@ --- *
722 * Arguments: @keyset **ksroot@ = pointer to keyset list head
726 * Use: Frees (releases references to) all of the keys in a keyset.
729 extern void ksl_free(keyset **/*ksroot*/);
731 /* --- @ksl_link@ --- *
733 * Arguments: @keyset **ksroot@ = pointer to keyset list head
734 * @keyset *ks@ = pointer to a keyset
738 * Use: Links a keyset into a list. A keyset can only be on one list
739 * at a time. Bad things happen otherwise.
742 extern void ksl_link(keyset **/*ksroot*/, keyset */*ks*/);
744 /* --- @ksl_prune@ --- *
746 * Arguments: @keyset **ksroot@ = pointer to keyset list head
750 * Use: Prunes the keyset list by removing keys which mustn't be used
754 extern void ksl_prune(keyset **/*ksroot*/);
756 /* --- @ksl_encrypt@ --- *
758 * Arguments: @keyset **ksroot@ = pointer to keyset list head
759 * @unsigned ty@ = message type
760 * @buf *b@ = pointer to input buffer
761 * @buf *bb@ = pointer to output buffer
763 * Returns: Nonzero if a new key is needed.
765 * Use: Encrypts a packet.
768 extern int ksl_encrypt(keyset **/*ksroot*/, unsigned /*ty*/,
769 buf */*b*/, buf */*bb*/);
771 /* --- @ksl_decrypt@ --- *
773 * Arguments: @keyset **ksroot@ = pointer to keyset list head
774 * @unsigned ty@ = expected type code
775 * @buf *b@ = pointer to input buffer
776 * @buf *bb@ = pointer to output buffer
778 * Returns: Nonzero if the packet couldn't be decrypted.
780 * Use: Decrypts a packet.
783 extern int ksl_decrypt(keyset **/*ksroot*/, unsigned /*ty*/,
784 buf */*b*/, buf */*bb*/);
786 /*----- Challenges --------------------------------------------------------*/
790 * Arguments: @buf *b@ = where to put the challenge
792 * Returns: Zero if OK, nonzero on error.
794 * Use: Issues a new challenge.
797 extern int c_new(buf */*b*/);
799 /* --- @c_check@ --- *
801 * Arguments: @buf *b@ = where to find the challenge
803 * Returns: Zero if OK, nonzero if it didn't work.
805 * Use: Checks a challenge. On failure, the buffer is broken.
808 extern int c_check(buf */*b*/);
810 /*----- Administration interface ------------------------------------------*/
812 #define A_END ((char *)0)
814 /* --- @a_warn@ --- *
816 * Arguments: @const char *fmt@ = pointer to format string
817 * @...@ = other arguments
821 * Use: Informs all admin connections of a warning.
824 extern void a_warn(const char */*fmt*/, ...);
826 /* --- @a_notify@ --- *
828 * Arguments: @const char *fmt@ = pointer to format string
829 * @...@ = other arguments
833 * Use: Sends a notification to interested admin connections.
836 extern void a_notify(const char */*fmt*/, ...);
838 /* --- @a_create@ --- *
840 * Arguments: @int fd_in, fd_out@ = file descriptors to use
841 * @unsigned f@ = initial flags to set
845 * Use: Creates a new admin connection.
848 extern void a_create(int /*fd_in*/, int /*fd_out*/, unsigned /*f*/);
850 /* --- @a_quit@ --- *
856 * Use: Shuts things down nicely.
859 extern void a_quit(void);
861 /* --- @a_preselect@ --- *
867 * Use: Informs the admin module that we're about to select again,
868 * and that it should do cleanup things it has delayed until a
872 extern void a_preselect(void);
874 /* --- @a_daemon@ --- *
880 * Use: Informs the admin module that it's a daemon.
883 extern void a_daemon(void);
885 /* --- @a_init@ --- *
887 * Arguments: @const char *sock@ = socket name to create
891 * Use: Creates the admin listening socket.
894 extern void a_init(const char */*sock*/);
896 /*----- Mapping with addresses as keys ------------------------------------*/
898 /* --- @am_create@ --- *
900 * Arguments: @addrmap *m@ = pointer to map
904 * Use: Create an address map, properly set up.
907 extern void am_create(addrmap */*m*/);
909 /* --- @am_destroy@ --- *
911 * Arguments: @addrmap *m@ = pointer to map
915 * Use: Destroy an address map, throwing away all the entries.
918 extern void am_destroy(addrmap */*m*/);
920 /* --- @am_find@ --- *
922 * Arguments: @addrmap *m@ = pointer to map
923 * @const addr *a@ = address to look up
924 * @size_t sz@ = size of block to allocate
925 * @unsigned *f@ = where to store flags
927 * Returns: Pointer to found item, or null.
929 * Use: Finds a record with the given IP address, set @*f@ nonzero
930 * and returns it. If @sz@ is zero, and no match was found,
931 * return null; otherwise allocate a new block of @sz@ bytes,
932 * clear @*f@ to zero and return the block pointer.
935 extern void *am_find(addrmap */*m*/, const addr */*a*/,
936 size_t /*sz*/, unsigned */*f*/);
938 /* --- @am_remove@ --- *
940 * Arguments: @addrmap *m@ = pointer to map
941 * @void *i@ = pointer to the item
945 * Use: Removes an item from the map.
948 extern void am_remove(addrmap */*m*/, void */*i*/);
950 /*----- Peer management ---------------------------------------------------*/
952 /* --- @p_txstart@ --- *
954 * Arguments: @peer *p@ = pointer to peer block
955 * @unsigned msg@ = message type code
957 * Returns: A pointer to a buffer to write to.
959 * Use: Starts sending to a peer. Only one send can happen at a
963 extern buf *p_txstart(peer */*p*/, unsigned /*msg*/);
965 /* --- @p_txend@ --- *
967 * Arguments: @peer *p@ = pointer to peer block
971 * Use: Sends a packet to the peer.
974 extern void p_txend(peer */*p*/);
976 /* --- @p_pingsend@ --- *
978 * Arguments: @peer *p@ = destination peer
979 * @ping *pg@ = structure to fill in
980 * @unsigned type@ = message type
981 * @unsigned long timeout@ = how long to wait before giving up
982 * @void (*func)(int, void *)@ = callback function
983 * @void *arg@ = argument for callback
985 * Returns: Zero if successful, nonzero if it failed.
987 * Use: Sends a ping to a peer. Call @func@ with a nonzero argument
988 * if we get an answer within the timeout, or zero if no answer.
991 extern int p_pingsend(peer */*p*/, ping */*pg*/, unsigned /*type*/,
992 unsigned long /*timeout*/,
993 void (*/*func*/)(int, void *), void */*arg*/);
995 /* --- @p_pingdone@ --- *
997 * Arguments: @ping *p@ = ping structure
998 * @int rc@ = return code to pass on
1002 * Use: Disposes of a ping structure, maybe sending a notification.
1005 extern void p_pingdone(ping */*p*/, int /*rc*/);
1007 /* --- @p_greet@ --- *
1009 * Arguments: @peer *p@ = peer to send to
1010 * @const void *c@ = pointer to challenge
1011 * @size_t sz@ = size of challenge
1015 * Use: Sends a greeting packet.
1018 extern void p_greet(peer */*p*/, const void */*c*/, size_t /*sz*/);
1020 /* --- @p_tun@ --- *
1022 * Arguments: @peer *p@ = pointer to peer block
1023 * @buf *b@ = buffer containing incoming packet
1027 * Use: Handles a packet which needs to be sent to a peer.
1030 extern void p_tun(peer */*p*/, buf */*b*/);
1032 /* --- @p_keyreload@ --- *
1038 * Use: Forces a check of the daemon's keyring files.
1041 extern void p_keyreload(void);
1043 /* --- @p_interval@ --- *
1049 * Use: Called periodically to do tidying.
1052 extern void p_interval(void);
1054 /* --- @p_stats@ --- *
1056 * Arguments: @peer *p@ = pointer to a peer block
1058 * Returns: A pointer to the peer's statistics.
1061 extern stats *p_stats(peer */*p*/);
1063 /* --- @p_ifname@ --- *
1065 * Arguments: @peer *p@ = pointer to a peer block
1067 * Returns: A pointer to the peer's interface name.
1070 extern const char *p_ifname(peer */*p*/);
1072 /* --- @p_setifname@ --- *
1074 * Arguments: @peer *p@ = pointer to a peer block
1075 * @const char *name@ = pointer to the new name
1079 * Use: Changes the name held for a peer's interface.
1082 extern void p_setifname(peer */*p*/, const char */*name*/);
1084 /* --- @p_addr@ --- *
1086 * Arguments: @peer *p@ = pointer to a peer block
1088 * Returns: A pointer to the peer's address.
1091 extern const addr *p_addr(peer */*p*/);
1093 /* --- @p_init@ --- *
1095 * Arguments: @struct in_addr addr@ = address to bind to
1096 * @unsigned port@ = port number to listen to
1100 * Use: Initializes the peer system; creates the socket.
1103 extern void p_init(struct in_addr /*addr*/, unsigned /*port*/);
1105 /* --- @p_port@ --- *
1109 * Returns: Port number used for socket.
1112 unsigned p_port(void);
1114 /* --- @p_create@ --- *
1116 * Arguments: @peerspec *spec@ = information about this peer
1118 * Returns: Pointer to the peer block, or null if it failed.
1120 * Use: Creates a new named peer block. No peer is actually attached
1124 extern peer *p_create(peerspec */*spec*/);
1126 /* --- @p_name@ --- *
1128 * Arguments: @peer *p@ = pointer to a peer block
1130 * Returns: A pointer to the peer's name.
1132 * Use: Equivalent to @p_spec(p)->name@.
1135 extern const char *p_name(peer */*p*/);
1137 /* --- @p_spec@ --- *
1139 * Arguments: @peer *p@ = pointer to a peer block
1141 * Returns: Pointer to the peer's specification
1144 extern const peerspec *p_spec(peer */*p*/);
1146 /* --- @p_findbyaddr@ --- *
1148 * Arguments: @const addr *a@ = address to look up
1150 * Returns: Pointer to the peer block, or null if not found.
1152 * Use: Finds a peer by address.
1155 extern peer *p_findbyaddr(const addr */*a*/);
1157 /* --- @p_find@ --- *
1159 * Arguments: @const char *name@ = name to look up
1161 * Returns: Pointer to the peer block, or null if not found.
1163 * Use: Finds a peer by name.
1166 extern peer *p_find(const char */*name*/);
1168 /* --- @p_destroy@ --- *
1170 * Arguments: @peer *p@ = pointer to a peer
1174 * Use: Destroys a peer.
1177 extern void p_destroy(peer */*p*/);
1179 /* --- @FOREACH_PEER@ --- *
1181 * Arguments: @p@ = name to bind to each peer
1182 * @stuff@ = thing to do for each item
1184 * Use: Does something for each current peer.
1187 #define FOREACH_PEER(p, stuff) do { \
1190 for (p_mkiter(&i_); (p = p_next(&i_)) != 0; ) do stuff while (0); \
1193 /* --- @p_mkiter@ --- *
1195 * Arguments: @peer_iter *i@ = pointer to an iterator
1199 * Use: Initializes the iterator.
1202 extern void p_mkiter(peer_iter */*i*/);
1204 /* --- @p_next@ --- *
1206 * Arguments: @peer_iter *i@ = pointer to an iterator
1208 * Returns: Next peer, or null if at the end.
1210 * Use: Returns the next peer.
1213 extern peer *p_next(peer_iter */*i*/);
1215 /*----- Tunnel drivers ----------------------------------------------------*/
1218 extern const tunnel_ops tun_linux;
1222 extern const tunnel_ops tun_unet;
1226 extern const tunnel_ops tun_bsd;
1229 extern const tunnel_ops tun_slip;
1231 /*----- Other handy utilities ---------------------------------------------*/
1233 /* --- @mpstr@ --- *
1235 * Arguments: @mp *m@ = a multiprecision integer
1237 * Returns: A pointer to the integer's textual representation.
1239 * Use: Converts a multiprecision integer to a string. Corrupts
1243 extern const char *mpstr(mp */*m*/);
1245 /* --- @gestr@ --- *
1247 * Arguments: @group *g@ = a group
1248 * @ge *x@ = a group element
1250 * Returns: A pointer to the element's textual representation.
1252 * Use: Converts a group element to a string. Corrupts
1256 extern const char *gestr(group */*g*/, ge */*x*/);
1258 /* --- @timestr@ --- *
1260 * Arguments: @time_t t@ = a time to convert
1262 * Returns: A pointer to a textual representation of the time.
1264 * Use: Converts a time to a textual representation. Corrupts
1268 extern const char *timestr(time_t /*t*/);
1270 /* --- @mystrieq@ --- *
1272 * Arguments: @const char *x, *y@ = two strings
1274 * Returns: True if @x@ and @y are equal, up to case.
1277 extern int mystrieq(const char */*x*/, const char */*y*/);
1279 /* --- @seq_reset@ --- *
1281 * Arguments: @seqwin *s@ = sequence-checking window
1285 * Use: Resets a sequence number window.
1288 extern void seq_reset(seqwin */*s*/);
1290 /* --- @seq_check@ --- *
1292 * Arguments: @seqwin *s@ = sequence-checking window
1293 * @uint32 q@ = sequence number to check
1294 * @const char *service@ = service to report message from
1296 * Returns: A @SEQ_@ code.
1298 * Use: Checks a sequence number against the window, updating things
1302 extern int seq_check(seqwin */*s*/, uint32 /*q*/, const char */*service*/);
1304 /*----- That's all, folks -------------------------------------------------*/