1 #if defined(NO_BUFFER) || defined(NO_IP) || defined(NO_OPENSSL)
2 #error "Badness, NO_BUFFER, NO_IP or NO_OPENSSL is defined, turn them *off*"
5 /* Include our bits'n'pieces */
9 /********************************************/
10 /* Our local types that specify our "world" */
11 /********************************************/
13 /* These represent running "tunnels". Eg. if you wanted to do SSL in a
14 * "message-passing" scanario, the "int" file-descriptors might be replaced by
15 * thread or process IDs, and the "select" code might be replaced by message
16 * handling code. Whatever. */
17 typedef struct _tunala_item_t {
18 /* The underlying SSL state machine. This is a data-only processing unit
19 * and we communicate with it by talking to its four "buffers". */
21 /* The file-descriptors for the "dirty" (encrypted) side of the SSL
22 * setup. In actuality, this is typically a socket and both values are
24 int dirty_read, dirty_send;
25 /* The file-descriptors for the "clean" (unencrypted) side of the SSL
26 * setup. These could be stdin/stdout, a socket (both values the same),
27 * or whatever you like. */
28 int clean_read, clean_send;
31 /* This structure is used as the data for running the main loop. Namely, in a
32 * network format such as this, it is stuff for select() - but as pointed out,
33 * when moving the real-world to somewhere else, this might be replaced by
34 * something entirely different. It's basically the stuff that controls when
35 * it's time to do some "work". */
36 typedef struct _select_sets_t {
37 int max; /* As required as the first argument to select() */
38 fd_set reads, sends, excepts; /* As passed to select() */
40 typedef struct _tunala_selector_t {
41 select_sets_t last_selected; /* Results of the last select() */
42 select_sets_t next_select; /* What we'll next select on */
45 /* This structure is *everything*. We do it to avoid the use of globals so that,
46 * for example, it would be easier to shift things around between async-IO,
47 * thread-based, or multi-fork()ed (or combinations thereof). */
48 typedef struct _tunala_world_t {
49 /* The file-descriptor we "listen" on for new connections */
51 /* The array of tunnels */
52 tunala_item_t *tunnels;
53 /* the number of tunnels in use and allocated, respectively */
54 unsigned int tunnels_used, tunnels_size;
55 /* Our outside "loop" context stuff */
56 tunala_selector_t selector;
57 /* Our SSL_CTX, which is configured as the SSL client or server and has
58 * the various cert-settings and callbacks configured. */
60 /* Simple flag with complex logic :-) Indicates whether we're an SSL
61 * server or an SSL client. */
65 /*****************************/
66 /* Internal static functions */
67 /*****************************/
69 static SSL_CTX *initialise_ssl_ctx(int server_mode, const char *engine_id,
70 const char *CAfile, const char *cert, const char *key,
71 const char *dcert, const char *dkey, const char *cipher_list,
72 const char *dh_file, const char *dh_special, int out_state,
73 int out_verify, int verify_mode, unsigned int verify_depth);
74 static void selector_init(tunala_selector_t *selector);
75 static void selector_add_listener(tunala_selector_t *selector, int fd);
76 static void selector_add_tunala(tunala_selector_t *selector, tunala_item_t *t);
77 static int selector_select(tunala_selector_t *selector);
78 /* This returns -1 for error, 0 for no new connections, or 1 for success, in
79 * which case *newfd is populated. */
80 static int selector_get_listener(tunala_selector_t *selector, int fd, int *newfd);
81 static int tunala_world_new_item(tunala_world_t *world, int fd,
82 const unsigned char *ip, unsigned short port);
83 static void tunala_world_del_item(tunala_world_t *world, unsigned int idx);
84 static int tunala_item_io(tunala_selector_t *selector, tunala_item_t *item);
86 /*********************************************/
87 /* MAIN FUNCTION (and its utility functions) */
88 /*********************************************/
90 static const char *def_proxyhost = "127.0.0.1:443";
91 static const char *def_listenhost = "127.0.0.1:8080";
92 static int def_max_tunnels = 50;
93 static const char *def_cacert = NULL;
94 static const char *def_cert = NULL;
95 static const char *def_key = NULL;
96 static const char *def_dcert = NULL;
97 static const char *def_dkey = NULL;
98 static const char *def_engine_id = NULL;
99 static int def_server_mode = 0;
100 static const char *def_cipher_list = NULL;
101 static const char *def_dh_file = NULL;
102 static const char *def_dh_special = NULL;
103 static int def_out_state = 0;
104 static unsigned int def_out_verify = 0;
105 static int def_out_totals = 0;
106 static int def_verify_mode = 0;
107 static unsigned int def_verify_depth = 10;
109 static const char *helpstring =
110 "\n'Tunala' (A tunneler with a New Zealand accent)\n"
111 "Usage: tunala [options], where options are from;\n"
112 " -listen [host:]<port> (default = 127.0.0.1:8080)\n"
113 " -proxy <host>:<port> (default = 127.0.0.1:443)\n"
114 " -maxtunnels <num> (default = 50)\n"
115 " -cacert <path|NULL> (default = NULL)\n"
116 " -cert <path|NULL> (default = NULL)\n"
117 " -key <path|NULL> (default = whatever '-cert' is)\n"
118 " -dcert <path|NULL> (usually for DSA, default = NULL)\n"
119 " -dkey <path|NULL> (usually for DSA, default = whatever '-dcert' is)\n"
120 " -engine <id|NULL> (default = NULL)\n"
121 " -server <0|1> (default = 0, ie. an SSL client)\n"
122 " -cipher <list> (specifies cipher list to use)\n"
123 " -dh_file <path> (a PEM file containing DH parameters to use)\n"
124 " -dh_special <NULL|generate|standard> (see below: def=NULL)\n"
125 " -out_state (prints SSL handshake states)\n"
126 " -out_verify <0|1|2|3> (prints certificate verification states: def=1)\n"
127 " -out_totals (prints out byte-totals when a tunnel closes)\n"
128 " -v_peer (verify the peer certificate)\n"
129 " -v_strict (do not continue if peer doesn't authenticate)\n"
130 " -v_once (no verification in renegotiates)\n"
131 " -v_depth <num> (limit certificate chain depth, default = 10)\n"
132 " -<h|help|?> (displays this help screen)\n"
134 "(1) It is recommended to specify a cert+key when operating as an SSL server.\n"
135 " If you only specify '-cert', the same file must contain a matching\n"
137 "(2) Either dh_file or dh_special can be used to specify where DH parameters\n"
138 " will be obtained from (or '-dh_special NULL' for the default choice) but\n"
139 " you cannot specify both. For dh_special, 'generate' will create new DH\n"
140 " parameters on startup, and 'standard' will use embedded parameters\n"
143 /* Default DH parameters for use with "-dh_special standard" ... stolen striaght
145 static unsigned char dh512_p[]={
146 0xDA,0x58,0x3C,0x16,0xD9,0x85,0x22,0x89,0xD0,0xE4,0xAF,0x75,
147 0x6F,0x4C,0xCA,0x92,0xDD,0x4B,0xE5,0x33,0xB8,0x04,0xFB,0x0F,
148 0xED,0x94,0xEF,0x9C,0x8A,0x44,0x03,0xED,0x57,0x46,0x50,0xD3,
149 0x69,0x99,0xDB,0x29,0xD7,0x76,0x27,0x6B,0xA2,0xD3,0xD4,0x12,
150 0xE2,0x18,0xF4,0xDD,0x1E,0x08,0x4C,0xF6,0xD8,0x00,0x3E,0x7C,
153 static unsigned char dh512_g[]={
157 /* And the function that parses the above "standard" parameters, again, straight
158 * out of s_server. */
159 static DH *get_dh512(void)
163 if ((dh=DH_new()) == NULL) return(NULL);
164 dh->p=BN_bin2bn(dh512_p,sizeof(dh512_p),NULL);
165 dh->g=BN_bin2bn(dh512_g,sizeof(dh512_g),NULL);
166 if ((dh->p == NULL) || (dh->g == NULL))
171 /* Various help/error messages used by main() */
172 static int usage(const char *errstr, int isunknownarg)
175 fprintf(stderr, "Error: unknown argument '%s'\n", errstr);
177 fprintf(stderr, "Error: %s\n", errstr);
178 fprintf(stderr, "%s\n", helpstring);
182 static int err_str0(const char *str0)
184 fprintf(stderr, str0);
185 fprintf(stderr, "\n");
189 static int err_str1(const char *str0, const char *str1)
191 fprintf(stderr, str0, str1);
192 fprintf(stderr, "\n");
196 static int parse_max_tunnels(const char *s, unsigned int *maxtunnels)
200 l = strtoul(s, &temp, 10);
201 if((temp == s) || (*temp != '\0') || (l < 1) || (l > 1024)) {
202 fprintf(stderr, "Error, '%s' is an invalid value for "
206 *maxtunnels = (unsigned int)l;
210 static int parse_server_mode(const char *s, int *servermode)
214 l = strtoul(s, &temp, 10);
215 if((temp == s) || (*temp != '\0') || (l > 1)) {
216 fprintf(stderr, "Error, '%s' is an invalid value for the "
220 *servermode = (int)l;
224 static int parse_dh_special(const char *s, const char **dh_special)
226 if((strcmp(s, "NULL") == 0) || (strcmp(s, "generate") == 0) ||
227 (strcmp(s, "standard") == 0)) {
231 fprintf(stderr, "Error, '%s' is an invalid value for 'dh_special'\n", s);
235 static int parse_verify_level(const char *s, unsigned int *verify_level)
239 l = strtoul(s, &temp, 10);
240 if((temp == s) || (*temp != '\0') || (l > 3)) {
241 fprintf(stderr, "Error, '%s' is an invalid value for "
245 *verify_level = (unsigned int)l;
249 static int parse_verify_depth(const char *s, unsigned int *verify_depth)
253 l = strtoul(s, &temp, 10);
254 if((temp == s) || (*temp != '\0') || (l < 1) || (l > 50)) {
255 fprintf(stderr, "Error, '%s' is an invalid value for "
256 "verify_depth\n", s);
259 *verify_depth = (unsigned int)l;
263 /* Some fprintf format strings used when tunnels close */
264 static const char *io_stats_client_dirty =
265 " SSL (network) traffic to/from server; %8lu bytes in, %8lu bytes out\n";
266 static const char *io_stats_client_clean =
267 " tunnelled data to/from server; %8lu bytes in, %8lu bytes out\n";
268 static const char *io_stats_server_dirty =
269 " SSL (network) traffic to/from client; %8lu bytes in, %8lu bytes out\n";
270 static const char *io_stats_server_clean =
271 " tunnelled data to/from client; %8lu bytes in, %8lu bytes out\n";
273 int main(int argc, char *argv[])
277 tunala_world_t world;
278 tunala_item_t *t_item;
279 unsigned char *proxy_ip;
280 unsigned short proxy_port;
282 const char *proxyhost = def_proxyhost;
283 const char *listenhost = def_listenhost;
284 unsigned int max_tunnels = def_max_tunnels;
285 const char *cacert = def_cacert;
286 const char *cert = def_cert;
287 const char *key = def_key;
288 const char *dcert = def_dcert;
289 const char *dkey = def_dkey;
290 const char *engine_id = def_engine_id;
291 int server_mode = def_server_mode;
292 const char *cipher_list = def_cipher_list;
293 const char *dh_file = def_dh_file;
294 const char *dh_special = def_dh_special;
295 int out_state = def_out_state;
296 unsigned int out_verify = def_out_verify;
297 int out_totals = def_out_totals;
298 int verify_mode = def_verify_mode;
299 unsigned int verify_depth = def_verify_depth;
301 /* Parse command-line arguments */
305 if(strcmp(*argv, "-listen") == 0) {
307 return usage("-listen requires an argument", 0);
311 } else if(strcmp(*argv, "-proxy") == 0) {
313 return usage("-proxy requires an argument", 0);
317 } else if(strcmp(*argv, "-maxtunnels") == 0) {
319 return usage("-maxtunnels requires an argument", 0);
321 if(!parse_max_tunnels(*argv, &max_tunnels))
324 } else if(strcmp(*argv, "-cacert") == 0) {
326 return usage("-cacert requires an argument", 0);
328 if(strcmp(*argv, "NULL") == 0)
333 } else if(strcmp(*argv, "-cert") == 0) {
335 return usage("-cert requires an argument", 0);
337 if(strcmp(*argv, "NULL") == 0)
342 } else if(strcmp(*argv, "-key") == 0) {
344 return usage("-key requires an argument", 0);
346 if(strcmp(*argv, "NULL") == 0)
351 } else if(strcmp(*argv, "-dcert") == 0) {
353 return usage("-dcert requires an argument", 0);
355 if(strcmp(*argv, "NULL") == 0)
360 } else if(strcmp(*argv, "-dkey") == 0) {
362 return usage("-dkey requires an argument", 0);
364 if(strcmp(*argv, "NULL") == 0)
369 } else if(strcmp(*argv, "-engine") == 0) {
371 return usage("-engine requires an argument", 0);
375 } else if(strcmp(*argv, "-server") == 0) {
377 return usage("-server requires an argument", 0);
379 if(!parse_server_mode(*argv, &server_mode))
382 } else if(strcmp(*argv, "-cipher") == 0) {
384 return usage("-cipher requires an argument", 0);
388 } else if(strcmp(*argv, "-dh_file") == 0) {
390 return usage("-dh_file requires an argument", 0);
392 return usage("cannot mix -dh_file with "
397 } else if(strcmp(*argv, "-dh_special") == 0) {
399 return usage("-dh_special requires an argument", 0);
401 return usage("cannot mix -dh_file with "
404 if(!parse_dh_special(*argv, &dh_special))
407 } else if(strcmp(*argv, "-out_state") == 0) {
410 } else if(strcmp(*argv, "-out_verify") == 0) {
412 return usage("-out_verify requires an argument", 0);
414 if(!parse_verify_level(*argv, &out_verify))
417 } else if(strcmp(*argv, "-out_totals") == 0) {
420 } else if(strcmp(*argv, "-v_peer") == 0) {
421 verify_mode |= SSL_VERIFY_PEER;
423 } else if(strcmp(*argv, "-v_strict") == 0) {
424 verify_mode |= SSL_VERIFY_FAIL_IF_NO_PEER_CERT;
426 } else if(strcmp(*argv, "-v_once") == 0) {
427 verify_mode |= SSL_VERIFY_CLIENT_ONCE;
429 } else if(strcmp(*argv, "-v_depth") == 0) {
431 return usage("-v_depth requires an argument", 0);
433 if(!parse_verify_depth(*argv, &verify_depth))
436 } else if((strcmp(*argv, "-h") == 0) ||
437 (strcmp(*argv, "-help") == 0) ||
438 (strcmp(*argv, "-?") == 0)) {
439 fprintf(stderr, "%s\n", helpstring);
442 return usage(*argv, 1);
445 /* Initialise network stuff */
447 return err_str0("ip_initialise failed");
448 err_str0("ip_initialise succeeded");
449 /* Create the SSL_CTX */
450 if((world.ssl_ctx = initialise_ssl_ctx(server_mode, engine_id,
451 cacert, cert, key, dcert, dkey, cipher_list, dh_file,
452 dh_special, out_state, out_verify, verify_mode,
453 verify_depth)) == NULL)
454 return err_str1("initialise_ssl_ctx(engine_id=%s) failed",
455 (engine_id == NULL) ? "NULL" : engine_id);
456 err_str1("initialise_ssl_ctx(engine_id=%s) succeeded",
457 (engine_id == NULL) ? "NULL" : engine_id);
458 /* Create the listener */
459 if((world.listen_fd = ip_create_listener(listenhost)) == -1)
460 return err_str1("ip_create_listener(%s) failed", listenhost);
461 err_str1("ip_create_listener(%s) succeeded", listenhost);
462 if(!ip_parse_address(proxyhost, &proxy_ip, &proxy_port, 0))
463 return err_str1("ip_parse_address(%s) failed", proxyhost);
464 err_str1("ip_parse_address(%s) succeeded", proxyhost);
465 fprintf(stderr, "Info - proxying to %d.%d.%d.%d:%d\n",
466 (int)proxy_ip[0], (int)proxy_ip[1],
467 (int)proxy_ip[2], (int)proxy_ip[3], (int)proxy_port);
468 fprintf(stderr, "Info - set maxtunnels to %d\n", (int)max_tunnels);
469 fprintf(stderr, "Info - set to operate as an SSL %s\n",
470 (server_mode ? "server" : "client"));
471 /* Initialise the rest of the stuff */
472 world.tunnels_used = world.tunnels_size = 0;
473 world.tunnels = NULL;
474 world.server_mode = server_mode;
475 selector_init(&world.selector);
477 /* We're ready to loop */
479 /* Should we listen for *new* tunnels? */
480 if(world.tunnels_used < max_tunnels)
481 selector_add_listener(&world.selector, world.listen_fd);
482 /* We should add in our existing tunnels */
483 for(loop = 0; loop < world.tunnels_used; loop++)
484 selector_add_tunala(&world.selector, world.tunnels + loop);
485 /* Now do the select */
486 switch(selector_select(&world.selector)) {
488 fprintf(stderr, "selector_select returned a badness error.\n");
491 fprintf(stderr, "Warn, selector_select returned 0 - signal??\n");
496 /* Accept new connection if we should and can */
497 if((world.tunnels_used < max_tunnels) && (selector_get_listener(
498 &world.selector, world.listen_fd,
500 /* We have a new connection */
501 if(!tunala_world_new_item(&world, newfd,
502 proxy_ip, proxy_port))
503 fprintf(stderr, "tunala_world_new_item failed\n");
505 fprintf(stderr, "Info, new tunnel opened, now up to "
506 "%d\n", world.tunnels_used);
508 /* Give each tunnel its moment, note the while loop is because it makes
509 * the logic easier than with "for" to deal with an array that may shift
510 * because of deletes. */
512 t_item = world.tunnels;
513 while(loop < world.tunnels_used) {
514 if(!tunala_item_io(&world.selector, t_item)) {
515 /* We're closing whether for reasons of an error or a
516 * natural close. Don't increment loop or t_item because
517 * the next item is moving to us! */
520 fprintf(stderr, "Tunnel closing, traffic stats follow\n");
521 /* Display the encrypted (over the network) stats */
522 fprintf(stderr, (server_mode ? io_stats_server_dirty :
523 io_stats_client_dirty),
524 buffer_total_in(state_machine_get_buffer(
525 &t_item->sm,SM_DIRTY_IN)),
526 buffer_total_out(state_machine_get_buffer(
527 &t_item->sm,SM_DIRTY_OUT)));
528 /* Display the local (tunnelled) stats. NB: Data we
529 * *receive* is data sent *out* of the state_machine on
530 * its 'clean' side. Hence the apparent back-to-front
531 * OUT/IN mixup here :-) */
532 fprintf(stderr, (server_mode ? io_stats_server_clean :
533 io_stats_client_clean),
534 buffer_total_out(state_machine_get_buffer(
535 &t_item->sm,SM_CLEAN_OUT)),
536 buffer_total_in(state_machine_get_buffer(
537 &t_item->sm,SM_CLEAN_IN)));
539 tunala_world_del_item(&world, loop);
540 fprintf(stderr, "Info, tunnel closed, down to %d\n",
544 /* Move to the next item */
550 /* Should never get here */
559 static int ctx_set_cert(SSL_CTX *ctx, const char *cert, const char *key)
563 EVP_PKEY *pkey = NULL;
564 int toret = 0; /* Assume an error */
568 if((fp = fopen(cert, "r")) == NULL) {
569 fprintf(stderr, "Error opening cert file '%s'\n", cert);
572 if(!PEM_read_X509(fp, &x509, NULL, NULL)) {
573 fprintf(stderr, "Error reading PEM cert from '%s'\n",
577 if(!SSL_CTX_use_certificate(ctx, x509)) {
578 fprintf(stderr, "Error, cert in '%s' can not be used\n",
582 /* Clear the FILE* for reuse in the "key" code */
585 fprintf(stderr, "Info, operating with cert in '%s'\n", cert);
586 /* If a cert was given without matching key, we assume the same
587 * file contains the required key. */
592 fprintf(stderr, "Error, can't specify a key without a "
593 "corresponding certificate\n");
595 fprintf(stderr, "Error, ctx_set_cert called with "
601 if((fp = fopen(key, "r")) == NULL) {
602 fprintf(stderr, "Error opening key file '%s'\n", key);
605 if(!PEM_read_PrivateKey(fp, &pkey, NULL, NULL)) {
606 fprintf(stderr, "Error reading PEM key from '%s'\n",
610 if(!SSL_CTX_use_PrivateKey(ctx, pkey)) {
611 fprintf(stderr, "Error, key in '%s' can not be used\n",
615 fprintf(stderr, "Info, operating with key in '%s'\n", key);
617 fprintf(stderr, "Info, operating without a cert or key\n");
629 static int ctx_set_dh(SSL_CTX *ctx, const char *dh_file, const char *dh_special)
635 if(strcmp(dh_special, "NULL") == 0)
637 if(strcmp(dh_special, "standard") == 0) {
638 if((dh = get_dh512()) == NULL) {
639 fprintf(stderr, "Error, can't parse 'standard'"
643 fprintf(stderr, "Info, using 'standard' DH parameters\n");
646 if(strcmp(dh_special, "generate") != 0)
647 /* This shouldn't happen - screening values is handled
650 fprintf(stderr, "Info, generating DH parameters ... ");
652 if((dh = DH_generate_parameters(512, DH_GENERATOR_5,
653 NULL, NULL)) == NULL) {
654 fprintf(stderr, "error!\n");
657 fprintf(stderr, "complete\n");
660 /* So, we're loading dh_file */
661 if((fp = fopen(dh_file, "r")) == NULL) {
662 fprintf(stderr, "Error, couldn't open '%s' for DH parameters\n",
666 dh = PEM_read_DHparams(fp, NULL, NULL, NULL);
669 fprintf(stderr, "Error, could not parse DH parameters from '%s'\n",
673 fprintf(stderr, "Info, using DH parameters from file '%s'\n", dh_file);
675 SSL_CTX_set_tmp_dh(ctx, dh);
680 static SSL_CTX *initialise_ssl_ctx(int server_mode, const char *engine_id,
681 const char *CAfile, const char *cert, const char *key,
682 const char *dcert, const char *dkey, const char *cipher_list,
683 const char *dh_file, const char *dh_special, int out_state,
684 int out_verify, int verify_mode, unsigned int verify_depth)
686 SSL_CTX *ctx, *ret = NULL;
690 OpenSSL_add_ssl_algorithms();
691 SSL_load_error_strings();
693 meth = (server_mode ? SSLv23_server_method() : SSLv23_client_method());
697 if((e = ENGINE_by_id(engine_id)) == NULL) {
698 fprintf(stderr, "Error obtaining '%s' engine, openssl "
699 "errors follow\n", engine_id);
702 if(!ENGINE_set_default(e, ENGINE_METHOD_ALL)) {
703 fprintf(stderr, "Error assigning '%s' engine, openssl "
704 "errors follow\n", engine_id);
709 if((ctx = SSL_CTX_new(meth)) == NULL)
713 if(!X509_STORE_load_locations(SSL_CTX_get_cert_store(ctx),
715 fprintf(stderr, "Error loading CA cert(s) in '%s'\n",
719 fprintf(stderr, "Info, operating with CA cert(s) in '%s'\n",
722 fprintf(stderr, "Info, operating without a CA cert(-list)\n");
723 if(!SSL_CTX_set_default_verify_paths(ctx)) {
724 fprintf(stderr, "Error setting default verify paths\n");
729 if((cert || key) && !ctx_set_cert(ctx, cert, key))
732 if((dcert || dkey) && !ctx_set_cert(ctx, dcert, dkey))
737 if(!SSL_CTX_set_cipher_list(ctx, cipher_list)) {
738 fprintf(stderr, "Error setting cipher list '%s'\n",
742 fprintf(stderr, "Info, set cipher list '%s'\n", cipher_list);
744 fprintf(stderr, "Info, operating with default cipher list\n");
746 /* dh_file & dh_special */
747 if((dh_file || dh_special) && !ctx_set_dh(ctx, dh_file, dh_special))
750 /* out_state (output of SSL handshake states to screen). */
752 cb_ssl_info_set_output(stderr);
756 cb_ssl_verify_set_output(stderr);
757 cb_ssl_verify_set_level(out_verify);
761 cb_ssl_verify_set_depth(verify_depth);
763 /* Success! (includes setting verify_mode) */
764 SSL_CTX_set_info_callback(ctx, cb_ssl_info);
765 SSL_CTX_set_verify(ctx, verify_mode, cb_ssl_verify);
769 ERR_print_errors_fp(stderr);
780 static void selector_sets_init(select_sets_t *s)
785 FD_ZERO(&s->excepts);
787 static void selector_init(tunala_selector_t *selector)
789 selector_sets_init(&selector->last_selected);
790 selector_sets_init(&selector->next_select);
793 #define SEL_EXCEPTS 0x00
794 #define SEL_READS 0x01
795 #define SEL_SENDS 0x02
796 static void selector_add_raw_fd(tunala_selector_t *s, int fd, int flags)
798 FD_SET(fd, &s->next_select.excepts);
799 if(flags & SEL_READS)
800 FD_SET(fd, &s->next_select.reads);
801 if(flags & SEL_SENDS)
802 FD_SET(fd, &s->next_select.sends);
804 if(s->next_select.max < (fd + 1))
805 s->next_select.max = fd + 1;
808 static void selector_add_listener(tunala_selector_t *selector, int fd)
810 selector_add_raw_fd(selector, fd, SEL_READS);
813 static void selector_add_tunala(tunala_selector_t *s, tunala_item_t *t)
815 /* Set clean read if sm.clean_in is not full */
816 if(t->clean_read != -1) {
817 selector_add_raw_fd(s, t->clean_read,
818 (buffer_full(state_machine_get_buffer(&t->sm,
819 SM_CLEAN_IN)) ? SEL_EXCEPTS : SEL_READS));
821 /* Set clean send if sm.clean_out is not empty */
822 if(t->clean_send != -1) {
823 selector_add_raw_fd(s, t->clean_send,
824 (buffer_empty(state_machine_get_buffer(&t->sm,
825 SM_CLEAN_OUT)) ? SEL_EXCEPTS : SEL_SENDS));
827 /* Set dirty read if sm.dirty_in is not full */
828 if(t->dirty_read != -1) {
829 selector_add_raw_fd(s, t->dirty_read,
830 (buffer_full(state_machine_get_buffer(&t->sm,
831 SM_DIRTY_IN)) ? SEL_EXCEPTS : SEL_READS));
833 /* Set dirty send if sm.dirty_out is not empty */
834 if(t->dirty_send != -1) {
835 selector_add_raw_fd(s, t->dirty_send,
836 (buffer_empty(state_machine_get_buffer(&t->sm,
837 SM_DIRTY_OUT)) ? SEL_EXCEPTS : SEL_SENDS));
841 static int selector_select(tunala_selector_t *selector)
843 memcpy(&selector->last_selected, &selector->next_select,
844 sizeof(select_sets_t));
845 selector_sets_init(&selector->next_select);
846 return select(selector->last_selected.max,
847 &selector->last_selected.reads,
848 &selector->last_selected.sends,
849 &selector->last_selected.excepts, NULL);
852 /* This returns -1 for error, 0 for no new connections, or 1 for success, in
853 * which case *newfd is populated. */
854 static int selector_get_listener(tunala_selector_t *selector, int fd, int *newfd)
856 if(FD_ISSET(fd, &selector->last_selected.excepts))
858 if(!FD_ISSET(fd, &selector->last_selected.reads))
860 if((*newfd = ip_accept_connection(fd)) == -1)
865 /************************/
866 /* "Tunala" world stuff */
867 /************************/
869 static int tunala_world_make_room(tunala_world_t *world)
871 unsigned int newsize;
872 tunala_item_t *newarray;
874 if(world->tunnels_used < world->tunnels_size)
876 newsize = (world->tunnels_size == 0 ? 16 :
877 ((world->tunnels_size * 3) / 2));
878 if((newarray = malloc(newsize * sizeof(tunala_item_t))) == NULL)
880 memset(newarray, 0, newsize * sizeof(tunala_item_t));
881 if(world->tunnels_used > 0)
882 memcpy(newarray, world->tunnels,
883 world->tunnels_used * sizeof(tunala_item_t));
884 if(world->tunnels_size > 0)
885 free(world->tunnels);
887 world->tunnels = newarray;
888 world->tunnels_size = newsize;
892 static int tunala_world_new_item(tunala_world_t *world, int fd,
893 const unsigned char *ip, unsigned short port)
899 if(!tunala_world_make_room(world))
901 if((new_ssl = SSL_new(world->ssl_ctx)) == NULL) {
902 fprintf(stderr, "Error creating new SSL\n");
903 ERR_print_errors_fp(stderr);
906 item = world->tunnels + (world->tunnels_used++);
907 state_machine_init(&item->sm);
908 item->clean_read = item->clean_send =
909 item->dirty_read = item->dirty_send = -1;
910 if((newfd = ip_create_connection_split(ip, port)) == -1)
912 /* Which way round? If we're a server, "fd" is the dirty side and the
913 * connection we open is the clean one. For a client, it's the other way
915 if(world->server_mode) {
916 item->dirty_read = item->dirty_send = fd;
917 item->clean_read = item->clean_send = newfd;
919 item->clean_read = item->clean_send = fd;
920 item->dirty_read = item->dirty_send = newfd;
922 /* We use the SSL's "app_data" to indicate a call-back induced "kill" */
923 SSL_set_app_data(new_ssl, NULL);
924 if(!state_machine_set_SSL(&item->sm, new_ssl, world->server_mode))
928 tunala_world_del_item(world, world->tunnels_used - 1);
933 static void tunala_world_del_item(tunala_world_t *world, unsigned int idx)
935 tunala_item_t *item = world->tunnels + idx;
936 if(item->clean_read != -1)
937 close(item->clean_read);
938 if(item->clean_send != item->clean_read)
939 close(item->clean_send);
940 item->clean_read = item->clean_send = -1;
941 if(item->dirty_read != -1)
942 close(item->dirty_read);
943 if(item->dirty_send != item->dirty_read)
944 close(item->dirty_send);
945 item->dirty_read = item->dirty_send = -1;
946 state_machine_close(&item->sm);
947 /* OK, now we fix the item array */
948 if(idx + 1 < world->tunnels_used)
949 /* We need to scroll entries to the left */
950 memmove(world->tunnels + idx,
951 world->tunnels + (idx + 1),
952 (world->tunnels_used - (idx + 1)) *
953 sizeof(tunala_item_t));
954 world->tunnels_used--;
957 static int tunala_item_io(tunala_selector_t *selector, tunala_item_t *item)
959 int c_r, c_s, d_r, d_s; /* Four boolean flags */
961 /* Take ourselves out of the gene-pool if there was an except */
962 if((item->clean_read != -1) && FD_ISSET(item->clean_read,
963 &selector->last_selected.excepts))
965 if((item->clean_send != -1) && FD_ISSET(item->clean_send,
966 &selector->last_selected.excepts))
968 if((item->dirty_read != -1) && FD_ISSET(item->dirty_read,
969 &selector->last_selected.excepts))
971 if((item->dirty_send != -1) && FD_ISSET(item->dirty_send,
972 &selector->last_selected.excepts))
974 /* Grab our 4 IO flags */
975 c_r = c_s = d_r = d_s = 0;
976 if(item->clean_read != -1)
977 c_r = FD_ISSET(item->clean_read, &selector->last_selected.reads);
978 if(item->clean_send != -1)
979 c_s = FD_ISSET(item->clean_send, &selector->last_selected.sends);
980 if(item->dirty_read != -1)
981 d_r = FD_ISSET(item->dirty_read, &selector->last_selected.reads);
982 if(item->dirty_send != -1)
983 d_s = FD_ISSET(item->dirty_send, &selector->last_selected.sends);
984 /* If no IO has happened for us, skip needless data looping */
985 if(!c_r && !c_s && !d_r && !d_s)
988 c_r = (buffer_from_fd(state_machine_get_buffer(&item->sm,
989 SM_CLEAN_IN), item->clean_read) <= 0);
991 c_s = (buffer_to_fd(state_machine_get_buffer(&item->sm,
992 SM_CLEAN_OUT), item->clean_send) <= 0);
994 d_r = (buffer_from_fd(state_machine_get_buffer(&item->sm,
995 SM_DIRTY_IN), item->dirty_read) <= 0);
997 d_s = (buffer_to_fd(state_machine_get_buffer(&item->sm,
998 SM_DIRTY_OUT), item->dirty_send) <= 0);
999 /* If any of the flags is non-zero, that means they need closing */
1001 close(item->clean_read);
1002 if(item->clean_send == item->clean_read)
1003 item->clean_send = -1;
1004 item->clean_read = -1;
1006 if(c_s && (item->clean_send != -1)) {
1007 close(item->clean_send);
1008 if(item->clean_send == item->clean_read)
1009 item->clean_read = -1;
1010 item->clean_send = -1;
1013 close(item->dirty_read);
1014 if(item->dirty_send == item->dirty_read)
1015 item->dirty_send = -1;
1016 item->dirty_read = -1;
1018 if(d_s && (item->dirty_send != -1)) {
1019 close(item->dirty_send);
1020 if(item->dirty_send == item->dirty_read)
1021 item->dirty_read = -1;
1022 item->dirty_send = -1;
1024 /* This function name is attributed to the term donated by David
1025 * Schwartz on openssl-dev, message-ID:
1026 * <NCBBLIEPOCNJOAEKBEAKEEDGLIAA.davids@webmaster.com>. :-) */
1027 if(!state_machine_churn(&item->sm))
1028 /* If the SSL closes, it will also zero-out the _in buffers
1029 * and will in future process just outgoing data. As and
1030 * when the outgoing data has gone, it will return zero
1031 * here to tell us to bail out. */
1033 /* Otherwise, we return zero if both sides are dead. */
1034 if(((item->clean_read == -1) || (item->clean_send == -1)) &&
1035 ((item->dirty_read == -1) || (item->dirty_send == -1)))
1037 /* If only one side closed, notify the SSL of this so it can take
1038 * appropriate action. */
1039 if((item->clean_read == -1) || (item->clean_send == -1)) {
1040 if(!state_machine_close_clean(&item->sm))
1043 if((item->dirty_read == -1) || (item->dirty_send == -1)) {
1044 if(!state_machine_close_dirty(&item->sm))