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/macros.h>
75 #include <mLib/mdwopt.h>
76 #include <mLib/quis.h>
77 #include <mLib/report.h>
79 #include <mLib/selbuf.h>
83 #include <mLib/trace.h>
85 #include <mLib/versioncmp.h>
87 #include <catacomb/buf.h>
89 #include <catacomb/gcipher.h>
90 #include <catacomb/gmac.h>
91 #include <catacomb/grand.h>
92 #include <catacomb/key.h>
93 #include <catacomb/paranoia.h>
95 #include <catacomb/noise.h>
96 #include <catacomb/rand.h>
98 #include <catacomb/mp.h>
99 #include <catacomb/mprand.h>
100 #include <catacomb/dh.h>
101 #include <catacomb/ec.h>
102 #include <catacomb/ec-keys.h>
103 #include <catacomb/group.h>
105 #include "protocol.h"
110 /*----- Magic numbers -----------------------------------------------------*/
112 /* --- Trace flags --- */
120 #define T_KEYEXCH 64u
121 #define T_KEYMGMT 128u
128 #define SEC(n) (n##u)
129 #define MIN(n) (n##u * 60u)
130 #define MEG(n) (n##ul * 1024ul * 1024ul)
132 /* --- Other things --- */
134 #define PKBUFSZ 65536
136 /*----- Cipher selections -------------------------------------------------*/
138 typedef struct algswitch {
139 const gccipher *c; /* Symmetric encryption scheme */
140 const gccipher *mgf; /* Mask-generation function */
141 const gchash *h; /* Hash function */
142 const gcmac *m; /* Message authentication code */
143 size_t hashsz; /* Hash output size */
144 size_t tagsz; /* Length to truncate MAC tags */
145 size_t cksz, mksz; /* Key lengths for @c@ and @m@ */
148 extern algswitch algs;
150 #define MAXHASHSZ 64 /* Largest possible hash size */
152 #define HASH_STRING(h, s) GH_HASH((h), (s), sizeof(s))
154 /*----- Data structures ---------------------------------------------------*/
156 /* --- Socket addresses --- *
158 * A magic union of supported socket addresses.
163 struct sockaddr_in sin;
166 /* --- Sequence number checking --- */
168 typedef struct seqwin {
169 uint32 seq; /* First acceptable input sequence */
170 uint32 win; /* Window of acceptable numbers */
173 #define SEQ_WINSZ 32 /* Bits in sequence number window */
175 /* --- A symmetric keyset --- *
177 * A keyset contains a set of symmetric keys for encrypting and decrypting
178 * packets. Keysets are stored in a list, sorted in reverse order of
179 * creation, so that the most recent keyset (the one most likely to be used)
182 * Each keyset has a time limit and a data limit. The keyset is destroyed
183 * when either it has existed for too long, or it has been used to encrypt
184 * too much data. New key exchanges are triggered when keys are close to
188 typedef struct keyset {
189 struct keyset *next; /* Next active keyset in the list */
190 unsigned ref; /* Reference count for keyset */
191 struct peer *p; /* Pointer to peer structure */
192 time_t t_exp; /* Expiry time for this keyset */
193 unsigned long sz_exp; /* Data limit for the keyset */
194 T( unsigned seq; ) /* Sequence number for tracing */
195 unsigned f; /* Various useful flags */
196 gcipher *cin, *cout; /* Keyset ciphers for encryption */
197 size_t tagsz; /* Length to truncate MAC tags */
198 gmac *min, *mout; /* Keyset MACs for integrity */
199 uint32 oseq; /* Outbound sequence number */
200 seqwin iseq; /* Inbound sequence number */
203 #define KSF_LISTEN 1u /* Don't encrypt packets yet */
204 #define KSF_LINK 2u /* Key is in a linked list */
206 /* --- Key exchange --- *
208 * TrIPE uses the Wrestlers Protocol for its key exchange. The Wrestlers
209 * Protocol has a number of desirable features (e.g., perfect forward
210 * secrecy, and zero-knowledge authentication) which make it attractive for
211 * use in TrIPE. The Wrestlers Protocol was designed by Mark Wooding and
217 typedef struct kxchal {
218 struct keyexch *kx; /* Pointer back to key exchange */
219 ge *c; /* Responder's challenge */
220 ge *r; /* My reply to the challenge */
221 keyset *ks; /* Pointer to temporary keyset */
222 unsigned f; /* Various useful flags */
223 sel_timer t; /* Response timer for challenge */
224 octet hc[MAXHASHSZ]; /* Hash of his challenge */
225 octet ck[MAXHASHSZ]; /* His magical check value */
226 octet hswrq_in[MAXHASHSZ]; /* Inbound switch request message */
227 octet hswok_in[MAXHASHSZ]; /* Inbound switch confirmation */
228 octet hswrq_out[MAXHASHSZ]; /* Outbound switch request message */
229 octet hswok_out[MAXHASHSZ]; /* Outbound switch confirmation */
232 typedef struct keyexch {
233 struct peer *p; /* Pointer back to the peer */
234 keyset **ks; /* Peer's list of keysets */
235 unsigned f; /* Various useful flags */
236 unsigned s; /* Current state in exchange */
237 sel_timer t; /* Timer for next exchange */
238 ge *kpub; /* Peer's public key */
239 time_t texp_kpub; /* Expiry time for public key */
240 mp *alpha; /* My temporary secret */
241 ge *c; /* My challenge */
242 ge *rx; /* The expected response */
243 unsigned nr; /* Number of extant responses */
244 time_t t_valid; /* When this exchange goes bad */
245 octet hc[MAXHASHSZ]; /* Hash of my challenge */
246 kxchal *r[KX_NCHAL]; /* Array of challenges */
249 #define KXF_TIMER 1u /* Waiting for a timer to go off */
250 #define KXF_DEAD 2u /* The key-exchanger isn't up */
251 #define KXF_PUBKEY 4u /* Key exchanger has a public key */
252 #define KXF_CORK 8u /* Don't send anything yet */
255 KXS_DEAD, /* Uninitialized state (magical) */
256 KXS_CHAL, /* Main answer-challenges state */
257 KXS_COMMIT, /* Committed: send switch request */
258 KXS_SWITCH /* Switched: send confirmation */
261 /* --- Tunnel structure --- *
263 * Used to maintain system-specific information about the tunnel interface.
266 typedef struct tunnel tunnel;
269 typedef struct tunnel_ops {
270 const char *name; /* Name of this tunnel driver */
271 void (*init)(void); /* Initializes the system */
272 tunnel *(*create)(struct peer */*p*/, char **/*ifn*/);
273 /* Initializes a new tunnel */
274 void (*setifname)(tunnel */*t*/, const char */*ifn*/);
275 /* Notifies ifname change */
276 void (*inject)(tunnel */*t*/, buf */*b*/); /* Sends packet through if */
277 void (*destroy)(tunnel */*t*/); /* Destroys a tunnel */
280 #ifndef TUN_INTERNALS
281 struct tunnel { const tunnel_ops *ops; };
284 /* --- Peer statistics --- *
286 * Contains various interesting and not-so-interesting statistics about a
287 * peer. This is updated by various parts of the code. The format of the
288 * structure isn't considered private, and @p_stats@ returns a pointer to the
289 * statistics block for a given peer.
292 typedef struct stats {
293 unsigned long sz_in, sz_out; /* Size of all data in and out */
294 unsigned long sz_kxin, sz_kxout; /* Size of key exchange messages */
295 unsigned long sz_ipin, sz_ipout; /* Size of encapsulated IP packets */
296 time_t t_start, t_last, t_kx; /* Time peer created, last pk, kx */
297 unsigned long n_reject; /* Number of rejected packets */
298 unsigned long n_in, n_out; /* Number of packets in and out */
299 unsigned long n_kxin, n_kxout; /* Number of key exchange packets */
300 unsigned long n_ipin, n_ipout; /* Number of encrypted packets */
303 /* --- Peer structure --- *
305 * The main structure which glues everything else together.
308 typedef struct peerspec {
309 char *name; /* Peer's name */
310 const tunnel_ops *tops; /* Tunnel operations */
311 unsigned long t_ka; /* Keep alive interval */
312 addr sa; /* Socket address to speak to */
313 size_t sasz; /* Socket address size */
314 unsigned kxf; /* Key exchange flags to set */
317 typedef struct peer {
318 struct peer *next, *prev; /* Links to next and previous */
319 struct ping *pings; /* Pings we're waiting for */
320 peerspec spec; /* Specifications for this peer */
321 tunnel *t; /* Tunnel for local packets */
322 char *ifname; /* Interface name for tunnel */
323 keyset *ks; /* List head for keysets */
324 buf b; /* Buffer for sending packets */
325 stats st; /* Statistics */
326 keyexch kx; /* Key exchange protocol block */
327 sel_timer tka; /* Timer for keepalives */
330 typedef struct ping {
331 struct ping *next, *prev; /* Links to next and previous */
332 peer *p; /* Peer so we can free it */
333 unsigned msg; /* Kind of response expected */
334 uint32 id; /* Id so we can recognize response */
335 octet magic[32]; /* Some random data */
336 sel_timer t; /* Timeout for ping */
337 void (*func)(int /*rc*/, void */*arg*/); /* Function to call when done */
338 void *arg; /* Argument for callback */
349 /* --- Admin structure --- */
351 #define OBUFSZ 16384u
353 typedef struct obuf {
354 struct obuf *next; /* Next buffer in list */
355 char *p_in, *p_out; /* Pointers into the buffer */
356 char buf[OBUFSZ]; /* The actual buffer */
359 typedef struct oqueue {
360 obuf *hd, *tl; /* Head and tail pointers */
365 typedef struct admin_bgop {
366 struct admin_bgop *next, *prev; /* Links to next and previous */
367 struct admin *a; /* Owner job */
368 char *tag; /* Tag string for messages */
369 void (*cancel)(struct admin_bgop *); /* Destructor function */
372 typedef struct admin_resop {
373 admin_bgop bg; /* Background operation header */
374 char *addr; /* Hostname to be resolved */
375 bres_client r; /* Background resolver task */
376 sel_timer t; /* Timer for resolver */
377 addr sa; /* Socket address */
378 size_t sasz; /* Socket address size */
379 void (*func)(struct admin_resop *, int); /* Handler */
382 enum { ARES_OK, ARES_FAIL };
384 typedef struct admin_addop {
385 admin_resop r; /* Name resolution header */
386 peerspec peer; /* Peer pending creation */
389 typedef struct admin_greetop {
390 admin_resop r; /* Name resolution header */
391 void *c; /* Challenge block */
392 size_t sz; /* Length of challenge */
395 typedef struct admin_pingop {
396 admin_bgop bg; /* Background operation header */
397 ping ping; /* Ping pending response */
398 struct timeval pingtime; /* Time last ping was sent */
401 typedef struct admin_service {
402 sym_base _b; /* Hash table base structure */
403 char *version; /* The provided version */
404 struct admin *prov; /* Which client provides me */
405 struct admin_service *next, *prev; /* Client's list of services */
408 typedef struct admin_svcop {
409 admin_bgop bg; /* Background operation header */
410 struct admin *prov; /* Client servicing this job */
411 unsigned short index; /* This job's index */
412 struct admin_svcop *next, *prev; /* Links for provider's jobs */
415 typedef struct admin_jobentry {
416 unsigned short seq; /* Zero if unused */
418 admin_svcop *op; /* Operation, if slot in use, ... */
419 uint32 next; /* ... or index of next free slot */
423 typedef struct admin_jobtable {
424 uint32 n, sz; /* Used slots and table size */
425 admin_svcop *active; /* List of active jobs */
426 uint32 free; /* Index of first free slot */
427 admin_jobentry *v; /* And the big array of entries */
430 typedef struct admin {
431 struct admin *next, *prev; /* Links to next and previous */
432 unsigned f; /* Various useful flags */
433 unsigned ref; /* Reference counter */
435 unsigned seq; /* Sequence number for tracing */
437 oqueue out; /* Output buffer list */
438 oqueue delay; /* Delayed output buffer list */
439 admin_bgop *bg; /* Backgrounded operations */
440 admin_service *svcs; /* Which services I provide */
441 admin_jobtable j; /* Table of outstanding jobs */
442 selbuf b; /* Line buffer for commands */
443 sel_file w; /* Selector for write buffering */
446 #define AF_DEAD 1u /* Destroy this admin block */
447 #define AF_CLOSE 2u /* Client closed connection */
448 #define AF_NOTE 4u /* Catch notifications */
449 #define AF_WARN 8u /* Catch warning messages */
451 #define AF_TRACE 16u /* Catch tracing */
455 # define AF_ALLMSGS (AF_NOTE | AF_TRACE | AF_WARN)
457 # define AF_ALLMSGS (AF_NOTE | AF_WARN)
460 /*----- Global variables --------------------------------------------------*/
462 extern sel_state sel; /* Global I/O event state */
463 extern group *gg; /* The group we work in */
464 extern size_t indexsz; /* Size of exponent for the group */
465 extern mp *kpriv; /* Our private key */
466 extern ge *kpub; /* Our public key */
467 extern octet buf_i[PKBUFSZ], buf_o[PKBUFSZ], buf_t[PKBUFSZ];
468 extern const tunnel_ops *tunnels[]; /* Table of tunnels (0-term) */
469 extern const tunnel_ops *tun_default; /* Default tunnel to use */
472 extern const trace_opt tr_opts[]; /* Trace options array */
473 extern unsigned tr_flags; /* Trace options flags */
476 /*----- Other macros ------------------------------------------------------*/
478 #define TIMER noise_timer(RAND_GLOBAL)
480 /*----- Key management ----------------------------------------------------*/
482 /* --- @km_reload@ --- *
486 * Returns: Zero if OK, nonzero to force reloading of keys.
488 * Use: Checks the keyrings to see if they need reloading.
491 extern int km_reload(void);
493 /* --- @km_init@ --- *
495 * Arguments: @const char *kr_priv@ = private keyring file
496 * @const char *kr_pub@ = public keyring file
497 * @const char *tag@ = tag to load
501 * Use: Initializes, and loads the private key.
504 extern void km_init(const char */*kr_priv*/, const char */*kr_pub*/,
505 const char */*tag*/);
507 /* --- @km_getpubkey@ --- *
509 * Arguments: @const char *tag@ = public key tag to load
510 * @ge *kpub@ = where to put the public key
511 * @time_t *t_exp@ = where to put the expiry time
513 * Returns: Zero if OK, nonzero if it failed.
515 * Use: Fetches a public key from the keyring.
518 extern int km_getpubkey(const char */*tag*/, ge */*kpub*/,
521 /*----- Key exchange ------------------------------------------------------*/
523 /* --- @kx_start@ --- *
525 * Arguments: @keyexch *kx@ = pointer to key exchange context
526 * @int forcep@ = nonzero to ignore the quiet timer
530 * Use: Stimulates a key exchange. If a key exchage is in progress,
531 * a new challenge is sent (unless the quiet timer forbids
532 * this); if no exchange is in progress, one is commenced.
535 extern void kx_start(keyexch */*kx*/, int /*forcep*/);
537 /* --- @kx_message@ --- *
539 * Arguments: @keyexch *kx@ = pointer to key exchange context
540 * @unsigned msg@ = the message code
541 * @buf *b@ = pointer to buffer containing the packet
545 * Use: Reads a packet containing key exchange messages and handles
549 extern void kx_message(keyexch */*kx*/, unsigned /*msg*/, buf */*b*/);
551 /* --- @kx_free@ --- *
553 * Arguments: @keyexch *kx@ = pointer to key exchange context
557 * Use: Frees everything in a key exchange context.
560 extern void kx_free(keyexch */*kx*/);
562 /* --- @kx_newkeys@ --- *
564 * Arguments: @keyexch *kx@ = pointer to key exchange context
568 * Use: Informs the key exchange module that its keys may have
569 * changed. If fetching the new keys fails, the peer will be
570 * destroyed, we log messages and struggle along with the old
574 extern void kx_newkeys(keyexch */*kx*/);
576 /* --- @kx_init@ --- *
578 * Arguments: @keyexch *kx@ = pointer to key exchange context
579 * @peer *p@ = pointer to peer context
580 * @keyset **ks@ = pointer to keyset list
581 * @unsigned f@ = various useful flags
583 * Returns: Zero if OK, nonzero if it failed.
585 * Use: Initializes a key exchange module. The module currently
586 * contains no keys, and will attempt to initiate a key
590 extern int kx_init(keyexch */*kx*/, peer */*p*/,
591 keyset **/*ks*/, unsigned /*f*/);
593 /*----- Keysets and symmetric cryptography --------------------------------*/
595 /* --- @ks_drop@ --- *
597 * Arguments: @keyset *ks@ = pointer to a keyset
601 * Use: Decrements a keyset's reference counter. If the counter hits
602 * zero, the keyset is freed.
605 extern void ks_drop(keyset */*ks*/);
607 /* --- @ks_gen@ --- *
609 * Arguments: @const void *k@ = pointer to key material
610 * @size_t x, y, z@ = offsets into key material (see below)
611 * @peer *p@ = pointer to peer information
613 * Returns: A pointer to the new keyset.
615 * Use: Derives a new keyset from the given key material. The
616 * offsets @x@, @y@ and @z@ separate the key material into three
617 * parts. Between the @k@ and @k + x@ is `my' contribution to
618 * the key material; between @k + x@ and @k + y@ is `your'
619 * contribution; and between @k + y@ and @k + z@ is a shared
620 * value we made together. These are used to construct two
621 * pairs of symmetric keys. Each pair consists of an encryption
622 * key and a message authentication key. One pair is used for
623 * outgoing messages, the other for incoming messages.
625 * The new key is marked so that it won't be selected for output
626 * by @ksl_encrypt@. You can still encrypt data with it by
627 * calling @ks_encrypt@ directly.
630 extern keyset *ks_gen(const void */*k*/,
631 size_t /*x*/, size_t /*y*/, size_t /*z*/,
634 /* --- @ks_tregen@ --- *
636 * Arguments: @keyset *ks@ = pointer to a keyset
638 * Returns: The time at which moves ought to be made to replace this key.
641 extern time_t ks_tregen(keyset */*ks*/);
643 /* --- @ks_activate@ --- *
645 * Arguments: @keyset *ks@ = pointer to a keyset
649 * Use: Activates a keyset, so that it can be used for encrypting
653 extern void ks_activate(keyset */*ks*/);
655 /* --- @ks_encrypt@ --- *
657 * Arguments: @keyset *ks@ = pointer to a keyset
658 * @unsigned ty@ = message type
659 * @buf *b@ = pointer to input buffer
660 * @buf *bb@ = pointer to output buffer
662 * Returns: Zero if OK, nonzero if the key needs replacing. If the
663 * encryption failed, the output buffer is broken and zero is
666 * Use: Encrypts a block of data using the key. Note that the `key
667 * ought to be replaced' notification is only ever given once
668 * for each key. Also note that this call forces a keyset to be
669 * used even if it's marked as not for data output.
672 extern int ks_encrypt(keyset */*ks*/, unsigned /*ty*/,
673 buf */*b*/, buf */*bb*/);
675 /* --- @ks_decrypt@ --- *
677 * Arguments: @keyset *ks@ = pointer to a keyset
678 * @unsigned ty@ = expected type code
679 * @buf *b@ = pointer to an input buffer
680 * @buf *bb@ = pointer to an output buffer
682 * Returns: Zero on success, or nonzero if there was some problem.
684 * Use: Attempts to decrypt a message using a given key. Note that
685 * requesting decryption with a key directly won't clear a
686 * marking that it's not for encryption.
689 extern int ks_decrypt(keyset */*ks*/, unsigned /*ty*/,
690 buf */*b*/, buf */*bb*/);
692 /* --- @ksl_free@ --- *
694 * Arguments: @keyset **ksroot@ = pointer to keyset list head
698 * Use: Frees (releases references to) all of the keys in a keyset.
701 extern void ksl_free(keyset **/*ksroot*/);
703 /* --- @ksl_link@ --- *
705 * Arguments: @keyset **ksroot@ = pointer to keyset list head
706 * @keyset *ks@ = pointer to a keyset
710 * Use: Links a keyset into a list. A keyset can only be on one list
711 * at a time. Bad things happen otherwise.
714 extern void ksl_link(keyset **/*ksroot*/, keyset */*ks*/);
716 /* --- @ksl_prune@ --- *
718 * Arguments: @keyset **ksroot@ = pointer to keyset list head
722 * Use: Prunes the keyset list by removing keys which mustn't be used
726 extern void ksl_prune(keyset **/*ksroot*/);
728 /* --- @ksl_encrypt@ --- *
730 * Arguments: @keyset **ksroot@ = pointer to keyset list head
731 * @unsigned ty@ = message type
732 * @buf *b@ = pointer to input buffer
733 * @buf *bb@ = pointer to output buffer
735 * Returns: Nonzero if a new key is needed.
737 * Use: Encrypts a packet.
740 extern int ksl_encrypt(keyset **/*ksroot*/, unsigned /*ty*/,
741 buf */*b*/, buf */*bb*/);
743 /* --- @ksl_decrypt@ --- *
745 * Arguments: @keyset **ksroot@ = pointer to keyset list head
746 * @unsigned ty@ = expected type code
747 * @buf *b@ = pointer to input buffer
748 * @buf *bb@ = pointer to output buffer
750 * Returns: Nonzero if the packet couldn't be decrypted.
752 * Use: Decrypts a packet.
755 extern int ksl_decrypt(keyset **/*ksroot*/, unsigned /*ty*/,
756 buf */*b*/, buf */*bb*/);
758 /*----- Challenges --------------------------------------------------------*/
762 * Arguments: @buf *b@ = where to put the challenge
764 * Returns: Zero if OK, nonzero on error.
766 * Use: Issues a new challenge.
769 extern int c_new(buf */*b*/);
771 /* --- @c_check@ --- *
773 * Arguments: @buf *b@ = where to find the challenge
775 * Returns: Zero if OK, nonzero if it didn't work.
777 * Use: Checks a challenge. On failure, the buffer is broken.
780 extern int c_check(buf */*b*/);
782 /*----- Administration interface ------------------------------------------*/
784 #define A_END ((char *)0)
786 /* --- @a_warn@ --- *
788 * Arguments: @const char *fmt@ = pointer to format string
789 * @...@ = other arguments
793 * Use: Informs all admin connections of a warning.
796 extern void a_warn(const char */*fmt*/, ...);
798 /* --- @a_notify@ --- *
800 * Arguments: @const char *fmt@ = pointer to format string
801 * @...@ = other arguments
805 * Use: Sends a notification to interested admin connections.
808 extern void a_notify(const char */*fmt*/, ...);
810 /* --- @a_create@ --- *
812 * Arguments: @int fd_in, fd_out@ = file descriptors to use
813 * @unsigned f@ = initial flags to set
817 * Use: Creates a new admin connection.
820 extern void a_create(int /*fd_in*/, int /*fd_out*/, unsigned /*f*/);
822 /* --- @a_quit@ --- *
828 * Use: Shuts things down nicely.
831 extern void a_quit(void);
833 /* --- @a_preselect@ --- *
839 * Use: Informs the admin module that we're about to select again,
840 * and that it should do cleanup things it has delayed until a
844 extern void a_preselect(void);
846 /* --- @a_daemon@ --- *
852 * Use: Informs the admin module that it's a daemon.
855 extern void a_daemon(void);
857 /* --- @a_init@ --- *
859 * Arguments: @const char *sock@ = socket name to create
863 * Use: Creates the admin listening socket.
866 extern void a_init(const char */*sock*/);
868 /*----- Peer management ---------------------------------------------------*/
870 /* --- @p_txstart@ --- *
872 * Arguments: @peer *p@ = pointer to peer block
873 * @unsigned msg@ = message type code
875 * Returns: A pointer to a buffer to write to.
877 * Use: Starts sending to a peer. Only one send can happen at a
881 extern buf *p_txstart(peer */*p*/, unsigned /*msg*/);
883 /* --- @p_txend@ --- *
885 * Arguments: @peer *p@ = pointer to peer block
889 * Use: Sends a packet to the peer.
892 extern void p_txend(peer */*p*/);
894 /* --- @p_pingsend@ --- *
896 * Arguments: @peer *p@ = destination peer
897 * @ping *pg@ = structure to fill in
898 * @unsigned type@ = message type
899 * @unsigned long timeout@ = how long to wait before giving up
900 * @void (*func)(int, void *)@ = callback function
901 * @void *arg@ = argument for callback
903 * Returns: Zero if successful, nonzero if it failed.
905 * Use: Sends a ping to a peer. Call @func@ with a nonzero argument
906 * if we get an answer within the timeout, or zero if no answer.
909 extern int p_pingsend(peer */*p*/, ping */*pg*/, unsigned /*type*/,
910 unsigned long /*timeout*/,
911 void (*/*func*/)(int, void *), void */*arg*/);
913 /* --- @p_pingdone@ --- *
915 * Arguments: @ping *p@ = ping structure
916 * @int rc@ = return code to pass on
920 * Use: Disposes of a ping structure, maybe sending a notification.
923 extern void p_pingdone(ping */*p*/, int /*rc*/);
925 /* --- @p_greet@ --- *
927 * Arguments: @peer *p@ = peer to send to
928 * @const void *c@ = pointer to challenge
929 * @size_t sz@ = size of challenge
933 * Use: Sends a greeting packet.
936 extern void p_greet(peer */*p*/, const void */*c*/, size_t /*sz*/);
940 * Arguments: @peer *p@ = pointer to peer block
941 * @buf *b@ = buffer containing incoming packet
945 * Use: Handles a packet which needs to be sent to a peer.
948 extern void p_tun(peer */*p*/, buf */*b*/);
950 /* --- @p_keyreload@ --- *
956 * Use: Forces a check of the daemon's keyring files.
959 extern void p_keyreload(void);
961 /* --- @p_interval@ --- *
967 * Use: Called periodically to do tidying.
970 extern void p_interval(void);
972 /* --- @p_stats@ --- *
974 * Arguments: @peer *p@ = pointer to a peer block
976 * Returns: A pointer to the peer's statistics.
979 extern stats *p_stats(peer */*p*/);
981 /* --- @p_ifname@ --- *
983 * Arguments: @peer *p@ = pointer to a peer block
985 * Returns: A pointer to the peer's interface name.
988 extern const char *p_ifname(peer */*p*/);
990 /* --- @p_setifname@ --- *
992 * Arguments: @peer *p@ = pointer to a peer block
993 * @const char *name@ = pointer to the new name
997 * Use: Changes the name held for a peer's interface.
1000 extern void p_setifname(peer */*p*/, const char */*name*/);
1002 /* --- @p_addr@ --- *
1004 * Arguments: @peer *p@ = pointer to a peer block
1006 * Returns: A pointer to the peer's address.
1009 extern const addr *p_addr(peer */*p*/);
1011 /* --- @p_init@ --- *
1013 * Arguments: @struct in_addr addr@ = address to bind to
1014 * @unsigned port@ = port number to listen to
1018 * Use: Initializes the peer system; creates the socket.
1021 extern void p_init(struct in_addr /*addr*/, unsigned /*port*/);
1023 /* --- @p_port@ --- *
1027 * Returns: Port number used for socket.
1030 unsigned p_port(void);
1032 /* --- @p_create@ --- *
1034 * Arguments: @peerspec *spec@ = information about this peer
1036 * Returns: Pointer to the peer block, or null if it failed.
1038 * Use: Creates a new named peer block. No peer is actually attached
1042 extern peer *p_create(peerspec */*spec*/);
1044 /* --- @p_name@ --- *
1046 * Arguments: @peer *p@ = pointer to a peer block
1048 * Returns: A pointer to the peer's name.
1050 * Use: Equivalent to @p_spec(p)->name@.
1053 extern const char *p_name(peer */*p*/);
1055 /* --- @p_spec@ --- *
1057 * Arguments: @peer *p@ = pointer to a peer block
1059 * Returns: Pointer to the peer's specification
1062 extern const peerspec *p_spec(peer */*p*/);
1064 /* --- @p_find@ --- *
1066 * Arguments: @const char *name@ = name to look up
1068 * Returns: Pointer to the peer block, or null if not found.
1070 * Use: Finds a peer by name.
1073 extern peer *p_find(const char */*name*/);
1075 /* --- @p_destroy@ --- *
1077 * Arguments: @peer *p@ = pointer to a peer
1081 * Use: Destroys a peer.
1084 extern void p_destroy(peer */*p*/);
1086 /* --- @p_first@, @p_next@ --- *
1088 * Arguments: @peer *p@ = a peer block
1090 * Returns: @peer_first@ returns the first peer in some ordering;
1091 * @peer_next@ returns the peer following a given one in the
1092 * same ordering. Null is returned for the end of the list.
1095 extern peer *p_first(void);
1096 extern peer *p_next(peer */*p*/);
1098 /*----- Tunnel drivers ----------------------------------------------------*/
1101 extern const tunnel_ops tun_linux;
1105 extern const tunnel_ops tun_unet;
1109 extern const tunnel_ops tun_bsd;
1112 extern const tunnel_ops tun_slip;
1114 /*----- Other handy utilities ---------------------------------------------*/
1116 /* --- @mpstr@ --- *
1118 * Arguments: @mp *m@ = a multiprecision integer
1120 * Returns: A pointer to the integer's textual representation.
1122 * Use: Converts a multiprecision integer to a string. Corrupts
1126 extern const char *mpstr(mp */*m*/);
1128 /* --- @gestr@ --- *
1130 * Arguments: @group *g@ = a group
1131 * @ge *x@ = a group element
1133 * Returns: A pointer to the element's textual representation.
1135 * Use: Converts a group element to a string. Corrupts
1139 extern const char *gestr(group */*g*/, ge */*x*/);
1141 /* --- @timestr@ --- *
1143 * Arguments: @time_t t@ = a time to convert
1145 * Returns: A pointer to a textual representation of the time.
1147 * Use: Converts a time to a textual representation. Corrupts
1151 extern const char *timestr(time_t /*t*/);
1153 /* --- @mystrieq@ --- *
1155 * Arguments: @const char *x, *y@ = two strings
1157 * Returns: True if @x@ and @y are equal, up to case.
1160 extern int mystrieq(const char */*x*/, const char */*y*/);
1162 /* --- @seq_reset@ --- *
1164 * Arguments: @seqwin *s@ = sequence-checking window
1168 * Use: Resets a sequence number window.
1171 extern void seq_reset(seqwin */*s*/);
1173 /* --- @seq_check@ --- *
1175 * Arguments: @seqwin *s@ = sequence-checking window
1176 * @uint32 q@ = sequence number to check
1177 * @const char *service@ = service to report message from
1179 * Returns: A @SEQ_@ code.
1181 * Use: Checks a sequence number against the window, updating things
1185 extern int seq_check(seqwin */*s*/, uint32 /*q*/, const char */*service*/);
1187 /*----- That's all, folks -------------------------------------------------*/