Commit | Line | Data |
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c235c6ac | 1 | /* tclink.c - Library code for the TCLink client API. */ |
d667da5b IK |
2 | |
3 | #include "tclink.h" | |
4 | ||
d667da5b | 5 | #include <errno.h> |
c235c6ac IK |
6 | #include <memory.h> |
7 | #include <stdio.h> | |
d667da5b IK |
8 | #include <string.h> |
9 | ||
10 | #ifdef WIN32 | |
11 | #include <io.h> | |
12 | #include <winsock2.h> | |
13 | #else | |
c235c6ac IK |
14 | #include <arpa/inet.h> |
15 | #include <netdb.h> | |
16 | #include <netinet/in.h> | |
17 | #include <stdbool.h> | |
d667da5b | 18 | #include <strings.h> |
c235c6ac | 19 | #include <sys/socket.h> |
d667da5b IK |
20 | #include <sys/time.h> |
21 | #include <sys/types.h> | |
d667da5b IK |
22 | #include <unistd.h> |
23 | #endif | |
24 | ||
d667da5b IK |
25 | #include <fcntl.h> |
26 | #include <signal.h> | |
c235c6ac IK |
27 | #include <stdlib.h> |
28 | #include <sys/stat.h> | |
29 | #include <sys/types.h> | |
d667da5b IK |
30 | |
31 | #include <openssl/crypto.h> | |
d667da5b | 32 | #include <openssl/err.h> |
c235c6ac | 33 | #include <openssl/pem.h> |
d667da5b | 34 | #include <openssl/rand.h> |
c235c6ac IK |
35 | #include <openssl/ssl.h> |
36 | #include <openssl/x509.h> | |
d667da5b IK |
37 | |
38 | #ifdef WIN32 | |
c235c6ac | 39 | #define strcasecmp(x, y) stricmp(x, y) |
d667da5b | 40 | #else |
c235c6ac | 41 | #define closesocket(x) close(x) |
d667da5b IK |
42 | #endif |
43 | ||
c235c6ac | 44 | #define DEFAULT_HOST "pgw1.trustcommerce.com" |
d667da5b | 45 | |
c235c6ac IK |
46 | /* changed from forty second to one hundred second to reflect more complicated |
47 | * transaction processing logic */ | |
48 | #define TIMEOUT 100 /* seconds */ | |
49 | #define TC_BUFF_MAX 32000 | |
50 | #define TC_LINE_MAX ((PARAM_MAX_LEN * 2) + 2) | |
d667da5b | 51 | |
c235c6ac IK |
52 | char tclink_version[] = |
53 | TCLINK_VERSION; /* TCLINK_VERSION is defined in Makefile */ | |
54 | char tclink_host[] = DEFAULT_HOST; | |
55 | int tclink_port = 443; | |
d667da5b IK |
56 | |
57 | /*************************************************/ | |
58 | /* Data structures used only within this module. */ | |
59 | /*************************************************/ | |
60 | ||
61 | /* Variables used for transaction data. */ | |
62 | ||
63 | typedef struct param_data | |
64 | { | |
c235c6ac IK |
65 | char* name; |
66 | char* value; | |
67 | struct param_data* next; | |
d667da5b IK |
68 | } param; |
69 | ||
70 | typedef struct _TCLinkCon | |
71 | { | |
c235c6ac IK |
72 | /* Connection data */ |
73 | int* ip; | |
74 | int num_ips; | |
75 | int sd; | |
76 | ||
77 | /* SSL encryption */ | |
78 | const SSL_METHOD* meth; | |
79 | long ctx_options; | |
80 | SSL_CTX* ctx; | |
81 | SSL* ssl; | |
82 | ||
83 | /* Transaction parameters, sent and received */ | |
84 | param *send_param_list, *send_param_tail; | |
85 | param* recv_param_list; | |
86 | ||
87 | /* Connection status */ | |
88 | int is_error; | |
89 | int pass; | |
90 | time_t start_time; | |
91 | int dns; | |
92 | ||
93 | int (*validate_cert)(int, void*); | |
94 | int full_ssl_close; | |
d667da5b IK |
95 | |
96 | } TCLinkCon; | |
97 | ||
98 | /************************************* | |
99 | * Internal functions, not exported. * | |
100 | *************************************/ | |
101 | ||
102 | /* Random number from min to max. */ | |
c235c6ac IK |
103 | static int |
104 | number(int min, int max) | |
d667da5b | 105 | { |
c235c6ac IK |
106 | time_t t = time(0); |
107 | return (rand_r((unsigned int*)&t) % (max - min + 1)) + min; | |
d667da5b IK |
108 | } |
109 | ||
110 | /* Check if path points to a regular file */ | |
c235c6ac IK |
111 | int |
112 | is_regular_file(const char* path) | |
d667da5b | 113 | { |
c235c6ac IK |
114 | struct stat st; |
115 | stat(path, &st); | |
116 | return S_ISREG(st.st_mode); | |
d667da5b IK |
117 | } |
118 | ||
119 | /* Safe string copy and append functions. */ | |
c235c6ac IK |
120 | #define SAFE_COPY(d, s) safe_copy((d), (s), sizeof(d)); |
121 | #define SAFE_APPEND(d, s) safe_append((d), (s), sizeof(d)); | |
d667da5b | 122 | |
c235c6ac IK |
123 | static bool |
124 | safe_copy(char* dst, const char* src, int size) | |
d667da5b | 125 | { |
c235c6ac | 126 | int len = (int) strlen(src); |
d667da5b IK |
127 | if (len < size) |
128 | strcpy(dst, src); | |
129 | else { | |
130 | strncpy(dst, src, size - 1); | |
c235c6ac | 131 | dst[size - 1] = 0; |
d667da5b | 132 | } |
c235c6ac | 133 | return (len >= size); |
d667da5b IK |
134 | } |
135 | ||
c235c6ac IK |
136 | static bool |
137 | safe_append(char* dst, const char* src, int size) | |
d667da5b | 138 | { |
c235c6ac IK |
139 | int dlen = (int) strlen(dst); |
140 | int slen = (int) strlen(src); | |
141 | int avail = size - dlen; | |
142 | if (avail < 1) | |
143 | return true; | |
d667da5b IK |
144 | |
145 | if (slen < avail) | |
c235c6ac | 146 | strcpy(dst + dlen, src); |
d667da5b | 147 | else { |
c235c6ac IK |
148 | strncpy(dst + dlen, src, avail - 1); |
149 | dst[size - 1] = 0; | |
d667da5b | 150 | } |
c235c6ac | 151 | return (slen >= avail); |
d667da5b IK |
152 | } |
153 | ||
154 | /* Add a parameter-value pair to the recieved list. */ | |
c235c6ac IK |
155 | static void |
156 | AddRecvParam(TCLinkCon* c, const char* name, const char* value) | |
d667da5b | 157 | { |
c235c6ac | 158 | param* p; |
d667da5b | 159 | |
c235c6ac IK |
160 | if (name[0] == 0 || value[0] == 0) |
161 | return; | |
d667da5b | 162 | |
c235c6ac IK |
163 | p = (param*)malloc(sizeof(param)); |
164 | p->name = strdup(name); | |
165 | p->value = strdup(value); | |
166 | p->next = c->recv_param_list; | |
167 | c->recv_param_list = p; | |
d667da5b IK |
168 | } |
169 | ||
170 | /* Add a string to the received list. */ | |
c235c6ac IK |
171 | static int |
172 | AddRecvString(TCLinkCon* c, char* string) | |
d667da5b | 173 | { |
c235c6ac IK |
174 | char* ptr = strchr(string, '='); |
175 | if (ptr == NULL) | |
176 | return 0; | |
d667da5b | 177 | |
c235c6ac IK |
178 | *ptr = 0; |
179 | AddRecvParam(c, string, ptr + 1); | |
d667da5b | 180 | |
c235c6ac | 181 | return 1; |
d667da5b IK |
182 | } |
183 | ||
184 | /* Deallocate the send list. */ | |
c235c6ac IK |
185 | static void |
186 | ClearSendList(TCLinkCon* c) | |
d667da5b | 187 | { |
c235c6ac IK |
188 | param *p, *next; |
189 | for (p = c->send_param_list; p; p = next) { | |
190 | next = p->next; | |
191 | free(p->name); | |
192 | free(p->value); | |
193 | free(p); | |
194 | } | |
195 | ||
196 | c->send_param_list = c->send_param_tail = NULL; | |
d667da5b IK |
197 | } |
198 | ||
199 | /* Deallocate the recv list. */ | |
c235c6ac IK |
200 | static void |
201 | ClearRecvList(TCLinkCon* c) | |
d667da5b | 202 | { |
c235c6ac IK |
203 | param *p, *next; |
204 | for (p = c->recv_param_list; p; p = next) { | |
205 | next = p->next; | |
206 | free(p->name); | |
207 | free(p->value); | |
208 | free(p); | |
209 | } | |
210 | ||
211 | c->recv_param_list = NULL; | |
212 | } | |
213 | ||
214 | void | |
215 | do_SSL_randomize(void) | |
216 | { | |
217 | enum | |
218 | { | |
219 | RAND_VALS = 32 | |
220 | }; | |
221 | int randbuf[RAND_VALS]; | |
222 | char fname[512]; | |
223 | int use_rand_file; | |
224 | time_t t; | |
225 | int i, c; | |
226 | ||
227 | /* if they have a /dev/urandom we can skip this function */ | |
228 | if (RAND_status() != 0) | |
229 | return; | |
230 | ||
231 | t = time(0); | |
232 | RAND_seed((char*)&t, sizeof(time_t)); | |
233 | ||
234 | /* have they specified a random file with RANDFILE environment variable? */ | |
235 | use_rand_file = RAND_file_name(fname, sizeof(fname)) ? 1 : 0; | |
236 | if (use_rand_file) | |
237 | RAND_load_file(fname, 4096); | |
238 | ||
239 | /* stuff it with packets of random numbers until it is satisfied */ | |
240 | for (i = 0; i < 256 && RAND_status() == 0; i++) { | |
241 | for (c = 0; c < RAND_VALS; c++) | |
242 | randbuf[c] = rand_r((unsigned int*)&t); | |
243 | RAND_seed((char*)randbuf, sizeof(int) * RAND_VALS); | |
244 | } | |
245 | } | |
246 | ||
247 | /* Make sure all of the ssl objects are properly initialized. | |
248 | */ | |
249 | static int | |
250 | init_ssl(TCLinkCon* c) | |
251 | { | |
252 | int ret = 1; | |
253 | ||
254 | /* Sanity Check */ | |
255 | if (c == NULL) | |
256 | return 0; | |
257 | ||
258 | /* do some SSL setup */ | |
259 | if (!c->meth) { | |
260 | do_SSL_randomize(); /* handle systems without /dev/urandom */ | |
261 | #if OPENSSL_VERSION_NUMBER < 0x10100000L | |
262 | c->meth = SSLv23_client_method(); | |
263 | c->ctx_options = SSL_OP_NO_SSLv2 | SSL_OP_NO_SSLv3 | SSL_OP_NO_TLSv1; | |
264 | #else | |
265 | c->meth = TLS_client_method(); | |
266 | c->ctx_options = SSL_OP_NO_SSLv2 | SSL_OP_NO_SSLv3 | SSL_OP_NO_TLSv1 | | |
267 | SSL_OP_NO_TLSv1_1 | SSL_OP_NO_TICKET; | |
268 | #endif | |
269 | } | |
270 | ||
271 | if (!c->ctx) { | |
272 | int val; | |
273 | int is_file; | |
274 | ||
275 | c->ctx = SSL_CTX_new(c->meth); | |
276 | if (!c->ctx) | |
277 | return 0; | |
278 | /* set options */ | |
279 | if (c->ctx_options) | |
280 | SSL_CTX_set_options(c->ctx, c->ctx_options); | |
281 | #if OPENSSL_VERSION_NUMBER >= 0x10100000L | |
282 | SSL_CTX_set_min_proto_version(c->ctx, TLS1_2_VERSION); | |
283 | #endif | |
284 | ||
285 | is_file = is_regular_file(TCLINK_CA_PATH); | |
286 | val = SSL_CTX_load_verify_locations( | |
287 | c->ctx, is_file ? TCLINK_CA_PATH : NULL, is_file ? NULL : TCLINK_CA_PATH); | |
288 | ||
289 | if (!val) | |
290 | return 0; // failed to populate cert store | |
291 | ||
292 | /* turn on certificate chain validation */ | |
293 | SSL_CTX_set_verify(c->ctx, SSL_VERIFY_PEER, NULL); | |
294 | } | |
295 | ||
296 | if (!c->ssl) { | |
297 | c->ssl = SSL_new(c->ctx); | |
298 | if (!c->ssl) { | |
299 | SSL_CTX_free(c->ctx); | |
300 | c->ctx = NULL; | |
301 | return 0; | |
302 | } | |
303 | } | |
304 | ||
305 | return ret; | |
d667da5b IK |
306 | } |
307 | ||
308 | /* Open a socket to the host_ip specified. Returns the socket's file | |
309 | * descriptor on success (the open attempt is underway) or -1 for failure | |
310 | * (should never happen in practice). Note that this function DOES NOT block | |
c235c6ac IK |
311 | * and wait for the connection; you'll need to select() on the socket later to |
312 | * see if it opened successfully. | |
d667da5b | 313 | */ |
c235c6ac IK |
314 | static int |
315 | BeginConnection(TCLinkCon* c, int host_ip) | |
d667da5b | 316 | { |
c235c6ac IK |
317 | struct sockaddr_in sa; |
318 | int sd; | |
d667da5b | 319 | |
c235c6ac IK |
320 | sd = socket(AF_INET, SOCK_STREAM, 0); |
321 | if (sd < 0) | |
322 | return -1; | |
d667da5b IK |
323 | |
324 | #ifdef WIN32 | |
c235c6ac IK |
325 | u_long param = 1; |
326 | ioctlsocket(sd, FIONBIO, ¶m); | |
d667da5b | 327 | #else |
c235c6ac | 328 | fcntl(sd, F_SETFL, O_NONBLOCK); |
d667da5b IK |
329 | #endif |
330 | ||
c235c6ac IK |
331 | memset(&sa, 0, sizeof(sa)); |
332 | sa.sin_family = AF_INET; | |
333 | sa.sin_addr.s_addr = host_ip; | |
334 | sa.sin_port = htons(tclink_port); | |
d667da5b | 335 | |
c235c6ac | 336 | connect(sd, (struct sockaddr*)&sa, sizeof(sa)); |
d667da5b | 337 | |
c235c6ac | 338 | return sd; |
d667da5b IK |
339 | } |
340 | ||
c235c6ac IK |
341 | /* This function is called on a socket file descriptor once the connection has |
342 | * been established and we're ready to negotiate SSL. If the SSL handshake | |
343 | * fails for some reason (such as the host on the other end not using SSL), it | |
344 | * will return 0 for failure. Success returns 1. | |
d667da5b | 345 | */ |
c235c6ac IK |
346 | static int |
347 | FinishConnection(TCLinkCon* c, int sd) | |
d667da5b | 348 | { |
c235c6ac IK |
349 | int ssl_connected, is_error, errcode, res; |
350 | X509* server_cert; | |
351 | time_t start, remaining; | |
352 | fd_set in, out, err; | |
353 | struct timeval tv; | |
354 | ||
355 | /* check if socket has connected successfully */ | |
356 | int val; | |
357 | socklen_t size = 4; | |
358 | getsockopt(sd, SOL_SOCKET, SO_ERROR, (char*)&val, &size); | |
359 | if (val != 0) | |
360 | return 0; | |
361 | ||
362 | if (c->ssl) | |
363 | SSL_clear(c->ssl); | |
364 | ||
365 | ERR_clear_error(); | |
366 | ||
367 | // Call init_ssl to make sure everything is setup properly. | |
368 | if (!init_ssl(c)) | |
369 | return 0; | |
370 | ||
371 | SSL_set_fd(c->ssl, sd); | |
372 | ||
373 | ssl_connected = 0; | |
374 | is_error = 0; | |
375 | start = time(0); | |
376 | ||
377 | while (!ssl_connected && !is_error) { | |
378 | ||
379 | remaining = 5 - (time(0) - start); | |
380 | if (remaining <= 0) { | |
381 | is_error = 1; | |
382 | break; | |
383 | } | |
384 | ||
385 | res = SSL_connect(c->ssl); | |
386 | ||
387 | ssl_connected = ((res == 1) && SSL_is_init_finished(c->ssl)); | |
388 | ||
389 | if (!ssl_connected) { | |
390 | FD_ZERO(&in); | |
391 | FD_SET((unsigned)sd, &in); | |
392 | FD_ZERO(&out); | |
393 | FD_SET((unsigned)sd, &out); | |
394 | FD_ZERO(&err); | |
395 | FD_SET((unsigned)sd, &err); | |
396 | /* the documentation does not suggest that both error types occur at the | |
397 | * same time so the retry logic will consume all the outstanding events we | |
398 | * do not actually use oob data, but if it is sent, it is treated as an | |
399 | * error all the same | |
400 | */ | |
401 | errcode = SSL_get_error(c->ssl, res); | |
402 | switch (errcode) { | |
403 | case SSL_ERROR_NONE: | |
404 | /* no error, we should have a connection, check again */ | |
405 | break; | |
406 | ||
407 | case SSL_ERROR_WANT_READ: | |
408 | /* no error, just wait for more data */ | |
409 | tv.tv_sec = remaining; | |
410 | tv.tv_usec = 0; | |
411 | /* posix-2001 says the function will modify the appropriate | |
412 | * descriptors */ | |
413 | if (select(sd + 1, &in, NULL, &err, &tv) < 0 || | |
414 | FD_ISSET((unsigned)sd, &err)) | |
415 | is_error = 1; | |
416 | break; | |
417 | case SSL_ERROR_WANT_WRITE: | |
418 | /* no error, just wait for more data */ | |
419 | tv.tv_sec = remaining; | |
420 | tv.tv_usec = 0; | |
421 | if (select(sd + 1, NULL, &out, &err, &tv) < 0 || | |
422 | FD_ISSET((unsigned)sd, &err)) | |
423 | is_error = 1; | |
424 | break; | |
425 | case SSL_ERROR_ZERO_RETURN: /* peer closed the connection */ | |
426 | case SSL_ERROR_SSL: /* error in SSL handshake */ | |
427 | default: | |
428 | is_error = 1; | |
429 | } | |
430 | } | |
431 | } | |
432 | ||
433 | if (is_error) { | |
434 | return 0; | |
435 | } | |
436 | ||
d667da5b | 437 | #ifdef WIN32 |
c235c6ac IK |
438 | u_long param = 0; |
439 | ioctlsocket(sd, FIONBIO, ¶m); // make the socket blocking again | |
d667da5b | 440 | #else |
c235c6ac | 441 | fcntl(sd, F_SETFL, 0); /* make the socket blocking again */ |
d667da5b | 442 | #endif |
c235c6ac IK |
443 | |
444 | /* verify that server certificate is authentic */ | |
445 | server_cert = SSL_get_peer_certificate(c->ssl); | |
446 | if (!server_cert) { | |
447 | return 0; | |
448 | } | |
449 | if (c->validate_cert && c->validate_cert(0, server_cert) != 0) { | |
450 | X509_free(server_cert); | |
451 | return 0; | |
452 | } | |
453 | X509_free(server_cert); | |
454 | ||
455 | return 1; | |
d667da5b IK |
456 | } |
457 | ||
c235c6ac IK |
458 | /* This function should be called on list of socket file descriptors (sd) to |
459 | * determine if any have opened successfully. If so, it will return which one | |
460 | * (index into the array). Otherwise it returns -1 if none have successfully | |
461 | * opened. This function will block for a maximum of 3 seconds. As this function | |
462 | * calls FinishConnection(), you shouldn't need to do anything special after it | |
463 | * returns success - the socket is set up and ready for use. | |
d667da5b | 464 | */ |
c235c6ac IK |
465 | static int |
466 | CheckConnection(TCLinkCon* c, int* sd, int num_sd) | |
d667da5b | 467 | { |
c235c6ac IK |
468 | fd_set wr_set, err_set; |
469 | struct timeval tv; | |
470 | int max_sd = -1, i; | |
471 | ||
472 | tv.tv_sec = 3; /* wait 3 seconds for soc->mething to happen */ | |
473 | tv.tv_usec = 0; | |
474 | ||
475 | /* build the fd_sets used for select() */ | |
476 | FD_ZERO(&wr_set); | |
477 | FD_ZERO(&err_set); | |
478 | for (i = 0; i < num_sd; i++) { | |
479 | if (sd[i] < 0) | |
480 | continue; | |
481 | FD_SET(sd[i], &wr_set); | |
482 | FD_SET(sd[i], &err_set); | |
483 | if (sd[i] > max_sd) | |
484 | max_sd = sd[i]; | |
485 | } | |
d667da5b | 486 | |
c235c6ac IK |
487 | /* run the select and see what we have waiting for us */ |
488 | if (select(max_sd + 1, NULL, &wr_set, &err_set, &tv) < 1) | |
489 | return -1; /* I hope this never happens */ | |
490 | ||
491 | for (i = 0; i < num_sd; i++) | |
492 | if (sd[i] >= 0) { | |
493 | if (FD_ISSET(sd[i], &err_set)) { | |
494 | /* error - close the socket and mark it defunct */ | |
495 | close(sd[i]); | |
496 | sd[i] = -1; | |
497 | } else if (FD_ISSET(sd[i], &wr_set)) { | |
498 | /* socket has opened! try to negotiate SSL */ | |
499 | if (FinishConnection(c, sd[i])) { | |
500 | /* socket is ready to go, so return success */ | |
501 | c->sd = sd[i]; | |
502 | return i; | |
503 | } else { | |
504 | /* SSL handshake had errors, close the socket and mark it defunct */ | |
505 | close(sd[i]); | |
506 | sd[i] = -1; | |
507 | // Clear the ssl environment too. | |
508 | if (c->ssl) { | |
509 | SSL_free(c->ssl); | |
510 | c->ssl = NULL; | |
511 | } | |
512 | } | |
513 | } | |
514 | } | |
515 | ||
516 | /* if we get here, nothing much interesting happened during those 3 seconds */ | |
517 | return -1; | |
d667da5b IK |
518 | } |
519 | ||
520 | /* Open a connection to one of the TrustCommerce gateway servers. */ | |
c235c6ac IK |
521 | static int |
522 | Connect(TCLinkCon* c, int host_hash) | |
d667da5b | 523 | { |
c235c6ac IK |
524 | struct hostent default_he; |
525 | char* addr_list[3]; | |
526 | int addr[2]; | |
527 | unsigned int** gw = NULL; | |
528 | ||
529 | enum | |
530 | { | |
531 | MAX_HOSTS = 32 | |
532 | }; | |
533 | time_t last_connect[MAX_HOSTS]; | |
534 | int sd[MAX_HOSTS]; | |
535 | int num_sd = 0; | |
536 | int host; | |
537 | ||
538 | int i, j, sort, sort_val; | |
539 | ||
540 | for (i = 0; i < MAX_HOSTS; i++) | |
541 | sd[i] = -1; | |
542 | ||
543 | c->sd = -1; | |
544 | c->is_error = 0; | |
545 | ||
546 | srand((unsigned) time(0)); | |
547 | ||
548 | /* These are used as BACKUP ONLY if the DNS if offline. */ | |
549 | addr[0] = inet_addr("206.82.213.130"); | |
550 | addr[1] = inet_addr("208.72.241.130"); | |
551 | addr_list[0] = (char*)&addr[0]; | |
552 | addr_list[1] = (char*)&addr[1]; | |
553 | addr_list[2] = 0; | |
554 | default_he.h_addr_list = addr_list; | |
555 | ||
556 | /* determine IP addresses of gateway */ | |
557 | if (!c->ip) { | |
558 | #ifndef __APPLE__ | |
559 | int herr = 0; | |
560 | char tmpbuf[4096]; | |
561 | struct hostent tmpres; | |
562 | #endif | |
563 | struct hostent * he = NULL; | |
564 | int ret = -1; | |
565 | ||
566 | #ifdef __APPLE__ | |
567 | he = gethostbyname(tclink_host); | |
568 | if (he) | |
569 | ret = 0; | |
570 | #else | |
571 | ret = | |
572 | gethostbyname_r(tclink_host, &tmpres, tmpbuf, sizeof(tmpbuf), &he, &herr); | |
573 | if (ret) | |
574 | he = NULL; | |
575 | ||
576 | #endif | |
577 | if (ret == 0 && he != NULL) { | |
578 | c->dns = 1; | |
579 | } else { | |
580 | /* fall back to hardcoded IPs in an emergency */ | |
581 | c->dns = 0; | |
582 | he = &default_he; | |
583 | } | |
584 | ||
585 | for (c->num_ips = 0; he->h_addr_list[c->num_ips]; c->num_ips++) | |
586 | ; | |
587 | ||
588 | c->ip = (int*)malloc(c->num_ips * sizeof(int)); | |
589 | gw = (int unsigned**)he->h_addr_list; | |
590 | ||
591 | /* sort the IP address list before storing it */ | |
592 | for (i = 0; i < c->num_ips; i++) { | |
593 | sort = 0; | |
594 | sort_val = *gw[0]; | |
595 | for (j = 1; j < c->num_ips; j++) | |
596 | if (*gw[j] > (unsigned int)sort_val) { | |
597 | sort = j; | |
598 | sort_val = *gw[j]; | |
599 | } | |
600 | ||
601 | c->ip[i] = sort_val; | |
602 | *gw[sort] = 0; | |
603 | } | |
604 | } | |
605 | ||
606 | if (!init_ssl(c)) | |
607 | return 0; | |
608 | ||
609 | /* This loop works as follows: | |
610 | * Grab the first host. Try to open a connection to it. If there was an | |
611 | * error (host down or unreachable) go to the next one. If nothing has | |
612 | * happened after 3 seconds, open a second socket (the first one is still | |
613 | * open!) and try with the next fail-over host. Continue to do this for a | |
614 | * maximum of MAX_HOSTS sockets, or until our TIMEOUT value runs out. We also | |
615 | * keep track of how recently we tried to connect to a given host, so that we | |
616 | * avoid saturating the machines in a heavy-load situation (which could be | |
617 | * caused by anything from heavy internet lag between the local host and the | |
618 | * TrustCommerce servers, to heavy load on the servers themselves due to half | |
619 | * a million people trying to run credit card transactions in the same half | |
620 | * second - unlikely, but certainly possible.) | |
621 | */ | |
622 | c->start_time = time(0); | |
623 | c->pass = 1; | |
624 | memset(last_connect, 0, MAX_HOSTS * sizeof(time_t)); | |
625 | ||
626 | host = host_hash % c->num_ips; | |
627 | ||
628 | for (; time(0) < (c->start_time + TIMEOUT); c->pass++) { | |
629 | /* retry the first host at least once */ | |
630 | if (c->pass > 2) | |
631 | host += 1; | |
632 | if (host >= c->num_ips) | |
633 | host = 0; | |
634 | ||
635 | /* only connect if we haven't tried this host before, or it's been a little | |
636 | * while (note random modifier to help stagger network traffic) */ | |
637 | if (last_connect[host] == 0 || | |
638 | (time(0) - last_connect[host]) >= number(TIMEOUT / 4, TIMEOUT)) { | |
639 | if (num_sd < MAX_HOSTS) { | |
640 | /* fire up a new connection to this host */ | |
641 | if (c->pass != 1) | |
642 | last_connect[host] = time(0); | |
643 | ||
644 | sd[num_sd] = BeginConnection(c, c->ip[host]); | |
645 | if (sd[num_sd] >= 0) | |
646 | num_sd++; | |
647 | } | |
648 | } | |
649 | ||
650 | /* scan all current sockets and see if we've made a successful connection | |
651 | * somewhere. note that this also includes SSL and all that sort of fun, | |
652 | * so once it returns success, we're all done. */ | |
653 | if (num_sd > 0) { | |
654 | if (CheckConnection(c, sd, num_sd) >= 0) { | |
655 | /* Success: close all other file handles and return */ | |
656 | for (i = 0; i < num_sd; i++) | |
657 | if (sd[i] >= 0 && sd[i] != c->sd) | |
658 | close(sd[i]); | |
659 | ||
660 | return 1; | |
661 | } | |
662 | } | |
663 | ||
664 | usleep(1000); // sleep for 1 millisecond | |
665 | } | |
666 | ||
667 | // We couldn't connect successfully to any endpoint/s. | |
668 | // Close any open sockets to avoid leaks. | |
669 | for (i = 0; i < num_sd; i++) { | |
670 | if (sd[i] >= 0) { | |
671 | close(sd[i]); | |
672 | sd[i] = -1; | |
673 | } | |
674 | } | |
675 | ||
676 | return 0; | |
d667da5b IK |
677 | } |
678 | ||
c235c6ac IK |
679 | /* Send a chunk of data through a connection previously opened with Connect(). |
680 | */ | |
681 | static int | |
682 | Send(TCLinkCon* c, const char* string) | |
d667da5b | 683 | { |
c235c6ac IK |
684 | if (SSL_write(c->ssl, string, (unsigned) strlen(string)) < 0) |
685 | return 0; | |
d667da5b | 686 | |
c235c6ac | 687 | return 1; |
d667da5b IK |
688 | } |
689 | ||
c235c6ac IK |
690 | /* Peel a line off the current input. Note that this DOESN'T necessarily wait |
691 | * for all input to come in, only up to a "\n". -1 is returned for a network | |
692 | * error, otherwise it returns the length of the line read. If there is not a | |
693 | * complete line pending for read this will block until there is, or an error | |
694 | * occurs. | |
d667da5b | 695 | */ |
c235c6ac IK |
696 | static int |
697 | ReadLine(TCLinkCon* c, char* buffer, char* destbuf) | |
d667da5b | 698 | { |
c235c6ac IK |
699 | struct timeval tv; |
700 | fd_set read; | |
701 | fd_set error; | |
702 | int sel; | |
703 | ||
704 | while (1) /* we wait for a line to come in or an error to occur */ | |
705 | { | |
706 | char* eol = strchr(buffer, '\n'); | |
707 | if (eol != NULL) { | |
708 | /* peel off the line and return it */ | |
709 | *eol++ = 0; | |
710 | safe_copy(destbuf, buffer, TC_LINE_MAX); | |
711 | memmove(buffer, eol, strlen(eol) + 1); | |
712 | return (int) strlen(destbuf); | |
713 | } else { | |
714 | if (c->is_error == 1) | |
715 | return -1; | |
716 | ||
717 | /* do socket work to grab the most recent chunk of incoming data */ | |
718 | FD_ZERO(&read); | |
719 | FD_SET(c->sd, &read); | |
720 | FD_ZERO(&error); | |
721 | FD_SET(c->sd, &error); | |
722 | tv.tv_sec = TIMEOUT; | |
723 | tv.tv_usec = 0; | |
724 | ||
725 | sel = select(c->sd + 1, &read, NULL, &error, &tv); | |
726 | if (sel < 1) | |
727 | c->is_error = 1; | |
728 | else if (FD_ISSET(c->sd, &error)) | |
729 | c->is_error = 1; | |
730 | else if (FD_ISSET(c->sd, &read)) { | |
731 | int buffer_end = (int) strlen(buffer); | |
732 | int size = | |
733 | SSL_read(c->ssl, buffer + buffer_end, TC_BUFF_MAX - 1 - buffer_end); | |
734 | if (size == 0) { | |
735 | int error_type = SSL_get_error(c->ssl, size); | |
736 | switch (error_type) { | |
737 | /* this would never happen in practice */ | |
738 | case SSL_ERROR_NONE: | |
739 | /* this wouldn't happen either because the ssl transport is blocking | |
740 | */ | |
741 | case SSL_ERROR_WANT_READ: | |
742 | case SSL_ERROR_WANT_WRITE: | |
743 | buffer[buffer_end] = 0; | |
744 | break; | |
745 | ||
746 | /* these others should not really happen but if they do, we bail */ | |
747 | /* we would never get any more data and it looks like the callee is | |
748 | * expecting something */ | |
749 | case SSL_ERROR_ZERO_RETURN: | |
750 | case SSL_ERROR_WANT_CONNECT: | |
751 | case SSL_ERROR_WANT_ACCEPT: | |
752 | case SSL_ERROR_SYSCALL: | |
753 | case SSL_ERROR_WANT_X509_LOOKUP: | |
754 | case SSL_ERROR_SSL: | |
755 | default: | |
756 | c->is_error = 1; | |
757 | break; | |
758 | } | |
759 | } else if (size < 0) | |
760 | c->is_error = 1; | |
761 | else | |
762 | buffer[buffer_end + size] = 0; | |
763 | } | |
764 | } | |
765 | } | |
d667da5b IK |
766 | } |
767 | ||
c235c6ac IK |
768 | /* Closes a connection opened with Connect() and frees memory associated with |
769 | * it. You ONLY need to Close() connections which opened successfully; those | |
770 | * that don't clean up after themselves before Connect() returns. | |
d667da5b | 771 | */ |
c235c6ac IK |
772 | static int |
773 | Close(TCLinkCon* c) | |
d667da5b | 774 | { |
c235c6ac IK |
775 | if (c->ssl) { |
776 | /* The full shutdown presented here is more for completeness than necessity; | |
777 | * at this point in the application, we have already received the end | |
778 | * trailer (or bust) which is generally accompanied by a close notify | |
779 | * message. If the software chooses to respond to the close notify (per TLS | |
780 | * specification) this would result in at least reading the incoming close | |
781 | * notify and issuing our own. Because this entails an additional round | |
782 | * trip that is not needed (the transaction is done after the accompanying | |
783 | * END), there does not appear to be a benefit to it at all. By default | |
784 | * though, this configuration is enabled and can be disabled by the | |
785 | * integrator for performance reasons. | |
786 | */ | |
787 | if (c->full_ssl_close) { | |
788 | int status = SSL_shutdown(c->ssl); | |
789 | if (status == 0) | |
790 | status = SSL_shutdown(c->ssl); | |
791 | } else | |
792 | SSL_set_shutdown(c->ssl, SSL_SENT_SHUTDOWN | SSL_RECEIVED_SHUTDOWN); | |
793 | } | |
794 | ||
795 | if (c->sd >= 0) { | |
796 | close(c->sd); | |
797 | c->sd = -1; | |
798 | } | |
799 | ||
800 | return 1; | |
d667da5b IK |
801 | } |
802 | ||
c235c6ac IK |
803 | static void |
804 | stuff_string(char* buf, int* len, int size, const char* add) | |
d667da5b | 805 | { |
c235c6ac IK |
806 | int newlen = (int) strlen(add); |
807 | if ((*len + newlen) >= size) | |
808 | newlen = size - *len - 1; | |
809 | if (newlen < 1) | |
810 | return; | |
811 | strncpy(buf + *len, add, newlen); | |
812 | *len += newlen; | |
813 | buf[*len] = 0; | |
d667da5b IK |
814 | } |
815 | ||
816 | /********************************************** | |
817 | * API functions exported to the user client. * | |
818 | **********************************************/ | |
819 | ||
c235c6ac IK |
820 | TCLinkHandle |
821 | TCLinkCreate() | |
d667da5b | 822 | { |
c235c6ac | 823 | extern int TCLinkDefaultValidate(int, void*); |
d667da5b | 824 | |
c235c6ac | 825 | TCLinkCon* c = (TCLinkCon*)malloc(sizeof(TCLinkCon)); |
d667da5b | 826 | |
c235c6ac IK |
827 | c->ip = NULL; |
828 | c->num_ips = 0; | |
829 | c->sd = -1; | |
d667da5b | 830 | |
c235c6ac IK |
831 | c->meth = NULL; |
832 | c->ctx_options = 0; | |
833 | c->ctx = NULL; | |
834 | c->ssl = NULL; | |
d667da5b | 835 | |
c235c6ac IK |
836 | c->send_param_list = NULL; |
837 | c->send_param_tail = NULL; | |
838 | c->recv_param_list = NULL; | |
d667da5b | 839 | |
c235c6ac IK |
840 | c->is_error = 0; |
841 | c->pass = 0; | |
842 | c->start_time = 0; | |
843 | c->dns = -1; | |
d667da5b | 844 | |
c235c6ac IK |
845 | c->validate_cert = TCLinkDefaultValidate; |
846 | c->full_ssl_close = 1; | |
d667da5b | 847 | |
c235c6ac | 848 | return (TCLinkHandle)c; |
d667da5b IK |
849 | } |
850 | ||
c235c6ac IK |
851 | int |
852 | TCLinkSetFullClose(TCLinkHandle handle, int full_ssl_close) | |
d667da5b | 853 | { |
c235c6ac IK |
854 | TCLinkCon* c = (TCLinkCon*)handle; |
855 | int swap = c->full_ssl_close; | |
856 | c->full_ssl_close = full_ssl_close ? 1 : 0; | |
857 | return swap; | |
d667da5b IK |
858 | } |
859 | ||
c235c6ac IK |
860 | void |
861 | TCLinkSetValidateCallback(TCLinkHandle handle, int (*validate_cert)(int, void*)) | |
d667da5b | 862 | { |
c235c6ac IK |
863 | TCLinkCon* c = (TCLinkCon*)handle; |
864 | if (validate_cert == NULL) { | |
865 | extern int TCLinkDefaultValidate(int, void*); | |
866 | c->validate_cert = TCLinkDefaultValidate; | |
867 | } else | |
868 | c->validate_cert = validate_cert; | |
d667da5b | 869 | } |
c235c6ac IK |
870 | |
871 | void | |
872 | TCLinkPushParam(TCLinkHandle handle, const char* name, const char* value) | |
d667da5b | 873 | { |
c235c6ac IK |
874 | param* p; |
875 | char* ch; | |
876 | ||
877 | TCLinkCon* c = (TCLinkCon*)handle; | |
878 | ||
879 | if (name && value) { | |
880 | p = (param*)malloc(sizeof(param)); | |
881 | p->name = strdup(name); | |
882 | p->value = strdup(value); | |
883 | p->next = NULL; | |
884 | if (c->send_param_tail) | |
885 | c->send_param_tail->next = p; | |
886 | else | |
887 | c->send_param_list = p; | |
888 | c->send_param_tail = p; | |
889 | ||
890 | /* remove newlines and equals signs from the parameter name */ | |
891 | for (ch = p->name; *ch; ch++) | |
892 | if (*ch == '=' || *ch == '\n') | |
893 | *ch = ' '; | |
894 | ||
895 | /* remove newlines from the value */ | |
896 | for (ch = p->value; *ch; ch++) | |
897 | if (*ch == '\n') | |
898 | *ch = ' '; | |
899 | } | |
d667da5b IK |
900 | } |
901 | ||
c235c6ac IK |
902 | void |
903 | TCLinkSend(TCLinkHandle handle) | |
d667da5b | 904 | { |
c235c6ac IK |
905 | param *p, *next; |
906 | char buf[TC_BUFF_MAX], destbuf[TC_LINE_MAX]; | |
907 | const int BUF2_LEN = 2048; | |
908 | char buf2[BUF2_LEN]; | |
909 | int host_hash = 1; | |
910 | int retval = 0; | |
911 | bool full = false; | |
912 | ||
913 | TCLinkCon* c = (TCLinkCon*)handle; | |
914 | ||
915 | ClearRecvList(c); | |
916 | ||
917 | /* build most of the string we will send to the processor */ | |
918 | sprintf(buf, "BEGIN\nversion=%s\n", tclink_version); | |
919 | ||
920 | for (p = c->send_param_list; p; p = next) { | |
921 | next = p->next; | |
922 | full = full || SAFE_COPY(buf2, p->name); | |
923 | full = full || SAFE_APPEND(buf2, "="); | |
924 | full = full || SAFE_APPEND(buf2, p->value); | |
925 | full = full || SAFE_APPEND(buf2, "\n"); | |
926 | full = full || SAFE_APPEND(buf, buf2); | |
927 | if (!full && !strcasecmp(p->name, "custid")) { | |
928 | ||
929 | host_hash = atoi(p->value); | |
930 | host_hash = (host_hash / 100) + (host_hash % 100); | |
931 | } | |
932 | ||
933 | free(p->name); | |
934 | free(p->value); | |
935 | free(p); | |
936 | } | |
937 | ||
938 | c->send_param_list = c->send_param_tail = NULL; | |
939 | ||
940 | /* try to make the connection */ | |
941 | if (!full && !Connect(c, host_hash)) { | |
942 | Close(c); /* clean up any memory Connect() may have left lying around */ | |
943 | AddRecvParam(c, "status", "error"); | |
944 | AddRecvParam(c, "errortype", "cantconnect"); | |
945 | return; | |
946 | } | |
947 | ||
948 | if (!full) { | |
949 | /* append some data about the connection */ | |
950 | snprintf( | |
951 | buf2, BUF2_LEN, "pass=%d\ntime=%ld\n", c->pass, time(0) - c->start_time); | |
952 | full = full || SAFE_APPEND(buf, buf2); | |
953 | if (c->dns != 1) | |
954 | SAFE_APPEND(buf, "dns=n\n"); | |
955 | full = full || SAFE_APPEND(buf, "END\n"); | |
956 | } | |
957 | ||
958 | if (full) { | |
959 | Close(c); | |
960 | AddRecvParam(c, "status", "baddata"); | |
961 | AddRecvParam(c, "error", "badlength"); | |
962 | AddRecvParam(c, "offenders", "request"); | |
963 | return; | |
964 | } | |
965 | ||
966 | /* send the data */ | |
967 | if (Send(c, buf)) { | |
968 | int state = 0; | |
969 | buf[0] = destbuf[0] = 0; /* recycle buf */ | |
970 | c->is_error = 0; | |
971 | while (1) { | |
972 | int len = ReadLine(c, buf, destbuf); | |
973 | if (len == 0) | |
974 | continue; | |
975 | if (len < 0) | |
976 | break; | |
977 | if (strcasecmp(destbuf, "BEGIN") == 0) { | |
978 | if (state != 0) { | |
979 | state = -1; | |
980 | break; | |
981 | } | |
982 | state = 1; | |
983 | } else if (strcasecmp(destbuf, "END") == 0) { | |
984 | state = (state != 1) ? -1 : 2; | |
985 | break; | |
986 | } else { | |
987 | if (state != 1 || !AddRecvString(c, destbuf)) { | |
988 | state = -1; | |
989 | break; | |
990 | } | |
991 | } | |
992 | } | |
993 | if (state == 2) | |
994 | retval = 1; | |
995 | } | |
996 | ||
997 | Close(c); | |
998 | ||
999 | if (!retval) { | |
1000 | ClearRecvList(c); | |
1001 | AddRecvParam(c, "status", "error"); | |
1002 | AddRecvParam(c, "errortype", "linkfailure"); | |
1003 | } | |
d667da5b | 1004 | } |
c235c6ac IK |
1005 | |
1006 | char* | |
1007 | TCLinkGetResponse(TCLinkHandle handle, const char* name, char* value) | |
d667da5b | 1008 | { |
c235c6ac IK |
1009 | param* p; |
1010 | TCLinkCon* c = (TCLinkCon*)handle; | |
d667da5b | 1011 | |
c235c6ac IK |
1012 | for (p = c->recv_param_list; p; p = p->next) |
1013 | if (strcasecmp(name, p->name) == 0) { | |
1014 | safe_copy(value, p->value, PARAM_MAX_LEN); | |
1015 | return value; | |
1016 | } | |
d667da5b | 1017 | |
c235c6ac | 1018 | return NULL; |
d667da5b IK |
1019 | } |
1020 | ||
c235c6ac IK |
1021 | char* |
1022 | TCLinkGetEntireResponse(TCLinkHandle handle, char* buf, int size) | |
d667da5b | 1023 | { |
c235c6ac IK |
1024 | param* p; |
1025 | int len = 0; | |
1026 | TCLinkCon* c = (TCLinkCon*)handle; | |
1027 | ||
1028 | for (p = c->recv_param_list; p; p = p->next) { | |
1029 | stuff_string(buf, &len, size, p->name); | |
1030 | stuff_string(buf, &len, size, "="); | |
1031 | stuff_string(buf, &len, size, p->value); | |
1032 | stuff_string(buf, &len, size, "\n"); | |
1033 | } | |
1034 | ||
1035 | return buf; | |
d667da5b IK |
1036 | } |
1037 | ||
c235c6ac IK |
1038 | void |
1039 | TCLinkDestroy(TCLinkHandle handle) | |
d667da5b | 1040 | { |
c235c6ac IK |
1041 | TCLinkCon* c = (TCLinkCon*)handle; |
1042 | if (!c) | |
1043 | return; | |
d667da5b | 1044 | |
c235c6ac IK |
1045 | ClearSendList(c); |
1046 | ClearRecvList(c); | |
1047 | Close(c); | |
d667da5b | 1048 | |
c235c6ac IK |
1049 | if (c->ip) |
1050 | free(c->ip); | |
d667da5b | 1051 | |
c235c6ac IK |
1052 | if (c->ssl) { |
1053 | SSL_free(c->ssl); | |
1054 | c->ssl = NULL; | |
1055 | } | |
d667da5b | 1056 | |
c235c6ac IK |
1057 | if (c->ctx) { |
1058 | SSL_CTX_free(c->ctx); | |
1059 | c->ctx = NULL; | |
1060 | } | |
d667da5b | 1061 | |
c235c6ac | 1062 | free(c); |
d667da5b IK |
1063 | } |
1064 | ||
c235c6ac IK |
1065 | char* |
1066 | TCLinkGetVersion(char* buf) | |
d667da5b | 1067 | { |
c235c6ac IK |
1068 | strcpy(buf, tclink_version); |
1069 | return buf; | |
d667da5b | 1070 | } |