/[debian]/bti/trunk/bti.c
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Contents of /bti/trunk/bti.c

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Revision 2159 - (show annotations)
Wed May 19 19:27:36 2010 UTC (10 years, 8 months ago) by gregoa
File MIME type: text/plain
File size: 31591 byte(s)
New upstream release.
1 /*
2 * Copyright (C) 2008 Greg Kroah-Hartman <greg@kroah.com>
3 * Copyright (C) 2009 Bart Trojanowski <bart@jukie.net>
4 * Copyright (C) 2009 Amir Mohammad Saied <amirsaied@gmail.com>
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the
8 * Free Software Foundation version 2 of the License.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
18 */
19
20 #define _GNU_SOURCE
21
22 #include <stdio.h>
23 #include <stdlib.h>
24 #include <stddef.h>
25 #include <string.h>
26 #include <getopt.h>
27 #include <errno.h>
28 #include <ctype.h>
29 #include <fcntl.h>
30 #include <unistd.h>
31 #include <time.h>
32 #include <sys/stat.h>
33 #include <sys/types.h>
34 #include <sys/wait.h>
35 #include <curl/curl.h>
36 #include <libxml/xmlmemory.h>
37 #include <libxml/parser.h>
38 #include <libxml/tree.h>
39 #include <pcre.h>
40 #include <termios.h>
41 #include <dlfcn.h>
42
43
44 #define zalloc(size) calloc(size, 1)
45
46 #define dbg(format, arg...) \
47 do { \
48 if (debug) \
49 fprintf(stdout, "bti: %s: " format , __func__ , \
50 ## arg); \
51 } while (0)
52
53
54 static int debug;
55 static int verbose;
56
57 enum host {
58 HOST_TWITTER = 0,
59 HOST_IDENTICA = 1,
60 HOST_CUSTOM = 2
61 };
62
63 enum action {
64 ACTION_UPDATE = 0,
65 ACTION_FRIENDS = 1,
66 ACTION_USER = 2,
67 ACTION_REPLIES = 4,
68 ACTION_PUBLIC = 8,
69 ACTION_GROUP = 16,
70 ACTION_UNKNOWN = 32
71 };
72
73 struct session {
74 char *password;
75 char *account;
76 char *tweet;
77 char *proxy;
78 char *time;
79 char *homedir;
80 char *logfile;
81 char *user;
82 char *group;
83 char *hosturl;
84 char *hostname;
85 char *configfile;
86 int bash;
87 int interactive;
88 int shrink_urls;
89 int dry_run;
90 int page;
91 enum host host;
92 enum action action;
93 void *readline_handle;
94 char *(*readline)(const char *);
95 };
96
97 struct bti_curl_buffer {
98 char *data;
99 enum action action;
100 int length;
101 };
102
103 static void display_help(void)
104 {
105 fprintf(stdout, "bti - send tweet to twitter or identi.ca\n");
106 fprintf(stdout, "Version: " VERSION "\n");
107 fprintf(stdout, "Usage:\n");
108 fprintf(stdout, " bti [options]\n");
109 fprintf(stdout, "options are:\n");
110 fprintf(stdout, " --account accountname\n");
111 fprintf(stdout, " --password password\n");
112 fprintf(stdout, " --action action\n");
113 fprintf(stdout, " ('update', 'friends', 'public', 'replies', "
114 "'group' or 'user')\n");
115 fprintf(stdout, " --user screenname\n");
116 fprintf(stdout, " --group groupname\n");
117 fprintf(stdout, " --proxy PROXY:PORT\n");
118 fprintf(stdout, " --host HOST\n");
119 fprintf(stdout, " --logfile logfile\n");
120 fprintf(stdout, " --config configfile\n");
121 fprintf(stdout, " --shrink-urls\n");
122 fprintf(stdout, " --page PAGENUMBER\n");
123 fprintf(stdout, " --bash\n");
124 fprintf(stdout, " --debug\n");
125 fprintf(stdout, " --verbose\n");
126 fprintf(stdout, " --dry-run\n");
127 fprintf(stdout, " --version\n");
128 fprintf(stdout, " --help\n");
129 }
130
131 static void display_version(void)
132 {
133 fprintf(stdout, "bti - version %s\n", VERSION);
134 }
135
136 static char *get_string(const char *name)
137 {
138 char *temp;
139 char *string;
140
141 string = zalloc(1000);
142 if (!string)
143 exit(1);
144 if (name != NULL)
145 fprintf(stdout, "%s", name);
146 if (!fgets(string, 999, stdin))
147 return NULL;
148 temp = strchr(string, '\n');
149 if (temp)
150 *temp = '\0';
151 return string;
152 }
153
154 /*
155 * Try to get a handle to a readline function from a variety of different
156 * libraries. If nothing is present on the system, then fall back to an
157 * internal one.
158 *
159 * Logic originally based off of code in the e2fsutils package in the
160 * lib/ss/get_readline.c file, which is licensed under the MIT license.
161 *
162 * This keeps us from having to relicense the bti codebase if readline
163 * ever changes its license, as there is no link-time dependancy.
164 * It is a run-time thing only, and we handle any readline-like library
165 * in the same manner, making bti not be a derivative work of any
166 * other program.
167 */
168 static void session_readline_init(struct session *session)
169 {
170 /* Libraries we will try to use for readline/editline functionality */
171 const char *libpath = "libreadline.so.6:libreadline.so.5:"
172 "libreadline.so.4:libreadline.so:libedit.so.2:"
173 "libedit.so:libeditline.so.0:libeditline.so";
174 void *handle = NULL;
175 char *tmp, *cp, *next;
176 int (*bind_key)(int, void *);
177 void (*insert)(void);
178
179 /* default to internal function if we can't or won't find anything */
180 session->readline = get_string;
181 if (!isatty(0))
182 return;
183 session->interactive = 1;
184
185 tmp = malloc(strlen(libpath)+1);
186 if (!tmp)
187 return;
188 strcpy(tmp, libpath);
189 for (cp = tmp; cp; cp = next) {
190 next = strchr(cp, ':');
191 if (next)
192 *next++ = 0;
193 if (*cp == 0)
194 continue;
195 handle = dlopen(cp, RTLD_NOW);
196 if (handle) {
197 dbg("Using %s for readline library\n", cp);
198 break;
199 }
200 }
201 free(tmp);
202 if (!handle) {
203 dbg("No readline library found.\n");
204 return;
205 }
206
207 session->readline_handle = handle;
208 session->readline = (char *(*)(const char *))dlsym(handle, "readline");
209 if (session->readline == NULL) {
210 /* something odd happened, default back to internal stuff */
211 session->readline_handle = NULL;
212 session->readline = get_string;
213 return;
214 }
215
216 /*
217 * If we found a library, turn off filename expansion
218 * as that makes no sense from within bti.
219 */
220 bind_key = (int (*)(int, void *))dlsym(handle, "rl_bind_key");
221 insert = (void (*)(void))dlsym(handle, "rl_insert");
222 if (bind_key && insert)
223 bind_key('\t', insert);
224 }
225
226 static void session_readline_cleanup(struct session *session)
227 {
228 if (session->readline_handle)
229 dlclose(session->readline_handle);
230 }
231
232 static struct session *session_alloc(void)
233 {
234 struct session *session;
235
236 session = zalloc(sizeof(*session));
237 if (!session)
238 return NULL;
239 return session;
240 }
241
242 static void session_free(struct session *session)
243 {
244 if (!session)
245 return;
246 free(session->password);
247 free(session->account);
248 free(session->tweet);
249 free(session->proxy);
250 free(session->time);
251 free(session->homedir);
252 free(session->user);
253 free(session->group);
254 free(session->hosturl);
255 free(session->hostname);
256 free(session->configfile);
257 free(session);
258 }
259
260 static struct bti_curl_buffer *bti_curl_buffer_alloc(enum action action)
261 {
262 struct bti_curl_buffer *buffer;
263
264 buffer = zalloc(sizeof(*buffer));
265 if (!buffer)
266 return NULL;
267
268 /* start out with a data buffer of 1 byte to
269 * make the buffer fill logic simpler */
270 buffer->data = zalloc(1);
271 if (!buffer->data) {
272 free(buffer);
273 return NULL;
274 }
275 buffer->length = 0;
276 buffer->action = action;
277 return buffer;
278 }
279
280 static void bti_curl_buffer_free(struct bti_curl_buffer *buffer)
281 {
282 if (!buffer)
283 return;
284 free(buffer->data);
285 free(buffer);
286 }
287
288 static const char *twitter_host = "https://twitter.com/statuses";
289 static const char *identica_host = "https://identi.ca/api/statuses";
290 static const char *twitter_name = "twitter";
291 static const char *identica_name = "identi.ca";
292
293 static const char *user_uri = "/user_timeline/";
294 static const char *update_uri = "/update.xml";
295 static const char *public_uri = "/public_timeline.xml";
296 static const char *friends_uri = "/friends_timeline.xml";
297 static const char *replies_uri = "/replies.xml";
298 static const char *group_uri = "/../laconica/groups/timeline/";
299
300 static CURL *curl_init(void)
301 {
302 CURL *curl;
303
304 curl = curl_easy_init();
305 if (!curl) {
306 fprintf(stderr, "Can not init CURL!\n");
307 return NULL;
308 }
309 /* some ssl sanity checks on the connection we are making */
310 curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0);
311 curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0);
312 return curl;
313 }
314
315 static void parse_statuses(xmlDocPtr doc, xmlNodePtr current)
316 {
317 xmlChar *text = NULL;
318 xmlChar *user = NULL;
319 xmlChar *created = NULL;
320 xmlNodePtr userinfo;
321
322 current = current->xmlChildrenNode;
323 while (current != NULL) {
324 if (current->type == XML_ELEMENT_NODE) {
325 if (!xmlStrcmp(current->name, (const xmlChar *)"created_at"))
326 created = xmlNodeListGetString(doc, current->xmlChildrenNode, 1);
327 if (!xmlStrcmp(current->name, (const xmlChar *)"text"))
328 text = xmlNodeListGetString(doc, current->xmlChildrenNode, 1);
329 if (!xmlStrcmp(current->name, (const xmlChar *)"user")) {
330 userinfo = current->xmlChildrenNode;
331 while (userinfo != NULL) {
332 if ((!xmlStrcmp(userinfo->name, (const xmlChar *)"screen_name"))) {
333 if (user)
334 xmlFree(user);
335 user = xmlNodeListGetString(doc, userinfo->xmlChildrenNode, 1);
336 }
337 userinfo = userinfo->next;
338 }
339 }
340
341 if (user && text && created) {
342 if (verbose)
343 printf("[%s] (%.16s) %s\n",
344 user, created, text);
345 else
346 printf("[%s] %s\n",
347 user, text);
348 xmlFree(user);
349 xmlFree(text);
350 xmlFree(created);
351 user = NULL;
352 text = NULL;
353 created = NULL;
354 }
355 }
356 current = current->next;
357 }
358
359 return;
360 }
361
362 static void parse_timeline(char *document)
363 {
364 xmlDocPtr doc;
365 xmlNodePtr current;
366
367 doc = xmlReadMemory(document, strlen(document), "timeline.xml",
368 NULL, XML_PARSE_NOERROR);
369 if (doc == NULL)
370 return;
371
372 current = xmlDocGetRootElement(doc);
373 if (current == NULL) {
374 fprintf(stderr, "empty document\n");
375 xmlFreeDoc(doc);
376 return;
377 }
378
379 if (xmlStrcmp(current->name, (const xmlChar *) "statuses")) {
380 fprintf(stderr, "unexpected document type\n");
381 xmlFreeDoc(doc);
382 return;
383 }
384
385 current = current->xmlChildrenNode;
386 while (current != NULL) {
387 if ((!xmlStrcmp(current->name, (const xmlChar *)"status")))
388 parse_statuses(doc, current);
389 current = current->next;
390 }
391 xmlFreeDoc(doc);
392
393 return;
394 }
395
396 static size_t curl_callback(void *buffer, size_t size, size_t nmemb,
397 void *userp)
398 {
399 struct bti_curl_buffer *curl_buf = userp;
400 size_t buffer_size = size * nmemb;
401 char *temp;
402
403 if ((!buffer) || (!buffer_size) || (!curl_buf))
404 return -EINVAL;
405
406 /* add to the data we already have */
407 temp = zalloc(curl_buf->length + buffer_size + 1);
408 if (!temp)
409 return -ENOMEM;
410
411 memcpy(temp, curl_buf->data, curl_buf->length);
412 free(curl_buf->data);
413 curl_buf->data = temp;
414 memcpy(&curl_buf->data[curl_buf->length], (char *)buffer, buffer_size);
415 curl_buf->length += buffer_size;
416 if (curl_buf->action)
417 parse_timeline(curl_buf->data);
418
419 dbg("%s\n", curl_buf->data);
420
421 return buffer_size;
422 }
423
424 static int send_request(struct session *session)
425 {
426 char endpoint[100];
427 char user_password[500];
428 char data[500];
429 struct bti_curl_buffer *curl_buf;
430 CURL *curl = NULL;
431 CURLcode res;
432 struct curl_httppost *formpost = NULL;
433 struct curl_httppost *lastptr = NULL;
434 struct curl_slist *slist = NULL;
435
436 if (!session)
437 return -EINVAL;
438
439 curl_buf = bti_curl_buffer_alloc(session->action);
440 if (!curl_buf)
441 return -ENOMEM;
442
443 curl = curl_init();
444 if (!curl)
445 return -EINVAL;
446
447 if (!session->hosturl)
448 session->hosturl = strdup(twitter_host);
449
450 switch (session->action) {
451 case ACTION_UPDATE:
452 snprintf(user_password, sizeof(user_password), "%s:%s",
453 session->account, session->password);
454 snprintf(data, sizeof(data), "status=\"%s\"", session->tweet);
455 curl_formadd(&formpost, &lastptr,
456 CURLFORM_COPYNAME, "status",
457 CURLFORM_COPYCONTENTS, session->tweet,
458 CURLFORM_END);
459
460 curl_formadd(&formpost, &lastptr,
461 CURLFORM_COPYNAME, "source",
462 CURLFORM_COPYCONTENTS, "bti",
463 CURLFORM_END);
464
465 curl_easy_setopt(curl, CURLOPT_HTTPPOST, formpost);
466 slist = curl_slist_append(slist, "Expect:");
467 curl_easy_setopt(curl, CURLOPT_HTTPHEADER, slist);
468
469 sprintf(endpoint, "%s%s", session->hosturl, update_uri);
470 curl_easy_setopt(curl, CURLOPT_URL, endpoint);
471 curl_easy_setopt(curl, CURLOPT_USERPWD, user_password);
472
473 break;
474 case ACTION_FRIENDS:
475 snprintf(user_password, sizeof(user_password), "%s:%s",
476 session->account, session->password);
477 sprintf(endpoint, "%s%s?page=%d", session->hosturl,
478 friends_uri, session->page);
479 curl_easy_setopt(curl, CURLOPT_URL, endpoint);
480 curl_easy_setopt(curl, CURLOPT_USERPWD, user_password);
481
482 break;
483 case ACTION_USER:
484 sprintf(endpoint, "%s%s%s.xml?page=%d", session->hosturl,
485 user_uri, session->user, session->page);
486 curl_easy_setopt(curl, CURLOPT_URL, endpoint);
487
488 break;
489 case ACTION_REPLIES:
490 snprintf(user_password, sizeof(user_password), "%s:%s",
491 session->account, session->password);
492 sprintf(endpoint, "%s%s?page=%d", session->hosturl, replies_uri,
493 session->page);
494 curl_easy_setopt(curl, CURLOPT_URL, endpoint);
495 curl_easy_setopt(curl, CURLOPT_USERPWD, user_password);
496
497 break;
498 case ACTION_PUBLIC:
499 sprintf(endpoint, "%s%s?page=%d", session->hosturl, public_uri,
500 session->page);
501 curl_easy_setopt(curl, CURLOPT_URL, endpoint);
502
503 break;
504 case ACTION_GROUP:
505 sprintf(endpoint, "%s%s%s.xml?page=%d", session->hosturl,
506 group_uri, session->group, session->page);
507 curl_easy_setopt(curl, CURLOPT_URL, endpoint);
508
509 break;
510 default:
511 break;
512 }
513
514 if (session->proxy)
515 curl_easy_setopt(curl, CURLOPT_PROXY, session->proxy);
516
517 if (debug)
518 curl_easy_setopt(curl, CURLOPT_VERBOSE, 1);
519
520 dbg("user_password = %s\n", user_password);
521 dbg("data = %s\n", data);
522 dbg("proxy = %s\n", session->proxy);
523
524 curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, curl_callback);
525 curl_easy_setopt(curl, CURLOPT_WRITEDATA, curl_buf);
526 if (!session->dry_run) {
527 res = curl_easy_perform(curl);
528 if (res && !session->bash) {
529 fprintf(stderr, "error(%d) trying to perform "
530 "operation\n", res);
531 return -EINVAL;
532 }
533 }
534
535 curl_easy_cleanup(curl);
536 if (session->action == ACTION_UPDATE)
537 curl_formfree(formpost);
538 bti_curl_buffer_free(curl_buf);
539 return 0;
540 }
541
542 static void parse_configfile(struct session *session)
543 {
544 FILE *config_file;
545 char *line = NULL;
546 size_t len = 0;
547 char *account = NULL;
548 char *password = NULL;
549 char *host = NULL;
550 char *proxy = NULL;
551 char *logfile = NULL;
552 char *action = NULL;
553 char *user = NULL;
554 char *file;
555 int shrink_urls = 0;
556
557 config_file = fopen(session->configfile, "r");
558
559 /* No error if file does not exist or is unreadable. */
560 if (config_file == NULL)
561 return;
562
563 do {
564 ssize_t n = getline(&line, &len, config_file);
565 if (n < 0)
566 break;
567 if (line[n - 1] == '\n')
568 line[n - 1] = '\0';
569 /* Parse file. Format is the usual value pairs:
570 account=name
571 passwort=value
572 # is a comment character
573 */
574 *strchrnul(line, '#') = '\0';
575 char *c = line;
576 while (isspace(*c))
577 c++;
578 /* Ignore blank lines. */
579 if (c[0] == '\0')
580 continue;
581
582 if (!strncasecmp(c, "account", 7) && (c[7] == '=')) {
583 c += 8;
584 if (c[0] != '\0')
585 account = strdup(c);
586 } else if (!strncasecmp(c, "password", 8) &&
587 (c[8] == '=')) {
588 c += 9;
589 if (c[0] != '\0')
590 password = strdup(c);
591 } else if (!strncasecmp(c, "host", 4) &&
592 (c[4] == '=')) {
593 c += 5;
594 if (c[0] != '\0')
595 host = strdup(c);
596 } else if (!strncasecmp(c, "proxy", 5) &&
597 (c[5] == '=')) {
598 c += 6;
599 if (c[0] != '\0')
600 proxy = strdup(c);
601 } else if (!strncasecmp(c, "logfile", 7) &&
602 (c[7] == '=')) {
603 c += 8;
604 if (c[0] != '\0')
605 logfile = strdup(c);
606 } else if (!strncasecmp(c, "action", 6) &&
607 (c[6] == '=')) {
608 c += 7;
609 if (c[0] != '\0')
610 action = strdup(c);
611 } else if (!strncasecmp(c, "user", 4) &&
612 (c[4] == '=')) {
613 c += 5;
614 if (c[0] != '\0')
615 user = strdup(c);
616 } else if (!strncasecmp(c, "shrink-urls", 11) &&
617 (c[11] == '=')) {
618 c += 12;
619 if (!strncasecmp(c, "true", 4) ||
620 !strncasecmp(c, "yes", 3))
621 shrink_urls = 1;
622 } else if (!strncasecmp(c, "verbose", 7) &&
623 (c[7] == '=')) {
624 c += 8;
625 if (!strncasecmp(c, "true", 4) ||
626 !strncasecmp(c, "yes", 3))
627 verbose = 1;
628 }
629 } while (!feof(config_file));
630
631 if (password)
632 session->password = password;
633 if (account)
634 session->account = account;
635 if (host) {
636 if (strcasecmp(host, "twitter") == 0) {
637 session->host = HOST_TWITTER;
638 session->hosturl = strdup(twitter_host);
639 session->hostname = strdup(twitter_name);
640 } else if (strcasecmp(host, "identica") == 0) {
641 session->host = HOST_IDENTICA;
642 session->hosturl = strdup(identica_host);
643 session->hostname = strdup(identica_name);
644 } else {
645 session->host = HOST_CUSTOM;
646 session->hosturl = strdup(host);
647 session->hostname = strdup(host);
648 }
649 free(host);
650 }
651 if (proxy) {
652 if (session->proxy)
653 free(session->proxy);
654 session->proxy = proxy;
655 }
656 if (logfile)
657 session->logfile = logfile;
658 if (action) {
659 if (strcasecmp(action, "update") == 0)
660 session->action = ACTION_UPDATE;
661 else if (strcasecmp(action, "friends") == 0)
662 session->action = ACTION_FRIENDS;
663 else if (strcasecmp(action, "user") == 0)
664 session->action = ACTION_USER;
665 else if (strcasecmp(action, "replies") == 0)
666 session->action = ACTION_REPLIES;
667 else if (strcasecmp(action, "public") == 0)
668 session->action = ACTION_PUBLIC;
669 else if (strcasecmp(action, "group") == 0)
670 session->action = ACTION_GROUP;
671 else
672 session->action = ACTION_UNKNOWN;
673 free(action);
674 }
675 if (user)
676 session->user = user;
677 session->shrink_urls = shrink_urls;
678
679 /* Free buffer and close file. */
680 free(line);
681 fclose(config_file);
682 }
683
684 static void log_session(struct session *session, int retval)
685 {
686 FILE *log_file;
687 char *filename;
688
689 /* Only log something if we have a log file set */
690 if (!session->logfile)
691 return;
692
693 filename = alloca(strlen(session->homedir) +
694 strlen(session->logfile) + 3);
695
696 sprintf(filename, "%s/%s", session->homedir, session->logfile);
697
698 log_file = fopen(filename, "a+");
699 if (log_file == NULL)
700 return;
701
702 switch (session->action) {
703 case ACTION_UPDATE:
704 if (retval)
705 fprintf(log_file, "%s: host=%s tweet failed\n",
706 session->time, session->hostname);
707 else
708 fprintf(log_file, "%s: host=%s tweet=%s\n",
709 session->time, session->hostname,
710 session->tweet);
711 break;
712 case ACTION_FRIENDS:
713 fprintf(log_file, "%s: host=%s retrieving friends timeline\n",
714 session->time, session->hostname);
715 break;
716 case ACTION_USER:
717 fprintf(log_file, "%s: host=%s retrieving %s's timeline\n",
718 session->time, session->hostname, session->user);
719 break;
720 case ACTION_REPLIES:
721 fprintf(log_file, "%s: host=%s retrieving replies\n",
722 session->time, session->hostname);
723 break;
724 case ACTION_PUBLIC:
725 fprintf(log_file, "%s: host=%s retrieving public timeline\n",
726 session->time, session->hostname);
727 break;
728 case ACTION_GROUP:
729 fprintf(log_file, "%s: host=%s retrieving group timeline\n",
730 session->time, session->hostname);
731 break;
732 default:
733 break;
734 }
735
736 fclose(log_file);
737 }
738
739 static char *get_string_from_stdin(void)
740 {
741 char *temp;
742 char *string;
743
744 string = zalloc(1000);
745 if (!string)
746 return NULL;
747
748 if (!fgets(string, 999, stdin))
749 return NULL;
750 temp = strchr(string, '\n');
751 if (temp)
752 *temp = '\0';
753 return string;
754 }
755
756 static void read_password(char *buf, size_t len, char *host)
757 {
758 char pwd[80];
759 int retval;
760 struct termios old;
761 struct termios tp;
762
763 tcgetattr(0, &tp);
764 old = tp;
765
766 tp.c_lflag &= (~ECHO);
767 tcsetattr(0, TCSANOW, &tp);
768
769 fprintf(stdout, "Enter password for %s: ", host);
770 fflush(stdout);
771 tcflow(0, TCOOFF);
772 retval = scanf("%79s", pwd);
773 tcflow(0, TCOON);
774 fprintf(stdout, "\n");
775
776 tcsetattr(0, TCSANOW, &old);
777
778 strncpy(buf, pwd, len);
779 buf[len-1] = '\0';
780 }
781
782 static int find_urls(const char *tweet, int **pranges)
783 {
784 /*
785 * magic obtained from
786 * http://www.geekpedia.com/KB65_How-to-validate-an-URL-using-RegEx-in-Csharp.html
787 */
788 static const char *re_magic =
789 "(([a-zA-Z][0-9a-zA-Z+\\-\\.]*:)/{1,3}"
790 "[0-9a-zA-Z;/~?:@&=+$\\.\\-_'()%]+)"
791 "(#[0-9a-zA-Z;/?:@&=+$\\.\\-_!~*'()%]+)?";
792 pcre *re;
793 const char *errptr;
794 int erroffset;
795 int ovector[10] = {0,};
796 const size_t ovsize = sizeof(ovector)/sizeof(*ovector);
797 int startoffset, tweetlen;
798 int i, rc;
799 int rbound = 10;
800 int rcount = 0;
801 int *ranges = malloc(sizeof(int) * rbound);
802
803 re = pcre_compile(re_magic,
804 PCRE_NO_AUTO_CAPTURE,
805 &errptr, &erroffset, NULL);
806 if (!re) {
807 fprintf(stderr, "pcre_compile @%u: %s\n", erroffset, errptr);
808 exit(1);
809 }
810
811 tweetlen = strlen(tweet);
812 for (startoffset = 0; startoffset < tweetlen; ) {
813
814 rc = pcre_exec(re, NULL, tweet, strlen(tweet), startoffset, 0,
815 ovector, ovsize);
816 if (rc == PCRE_ERROR_NOMATCH)
817 break;
818
819 if (rc < 0) {
820 fprintf(stderr, "pcre_exec @%u: %s\n",
821 erroffset, errptr);
822 exit(1);
823 }
824
825 for (i = 0; i < rc; i += 2) {
826 if ((rcount+2) == rbound) {
827 rbound *= 2;
828 ranges = realloc(ranges, sizeof(int) * rbound);
829 }
830
831 ranges[rcount++] = ovector[i];
832 ranges[rcount++] = ovector[i+1];
833 }
834
835 startoffset = ovector[1];
836 }
837
838 pcre_free(re);
839
840 *pranges = ranges;
841 return rcount;
842 }
843
844 /**
845 * bidirectional popen() call
846 *
847 * @param rwepipe - int array of size three
848 * @param exe - program to run
849 * @param argv - argument list
850 * @return pid or -1 on error
851 *
852 * The caller passes in an array of three integers (rwepipe), on successful
853 * execution it can then write to element 0 (stdin of exe), and read from
854 * element 1 (stdout) and 2 (stderr).
855 */
856 static int popenRWE(int *rwepipe, const char *exe, const char *const argv[])
857 {
858 int in[2];
859 int out[2];
860 int err[2];
861 int pid;
862 int rc;
863
864 rc = pipe(in);
865 if (rc < 0)
866 goto error_in;
867
868 rc = pipe(out);
869 if (rc < 0)
870 goto error_out;
871
872 rc = pipe(err);
873 if (rc < 0)
874 goto error_err;
875
876 pid = fork();
877 if (pid > 0) {
878 /* parent */
879 close(in[0]);
880 close(out[1]);
881 close(err[1]);
882 rwepipe[0] = in[1];
883 rwepipe[1] = out[0];
884 rwepipe[2] = err[0];
885 return pid;
886 } else if (pid == 0) {
887 /* child */
888 close(in[1]);
889 close(out[0]);
890 close(err[0]);
891 close(0);
892 rc = dup(in[0]);
893 close(1);
894 rc = dup(out[1]);
895 close(2);
896 rc = dup(err[1]);
897
898 execvp(exe, (char **)argv);
899 exit(1);
900 } else
901 goto error_fork;
902
903 return pid;
904
905 error_fork:
906 close(err[0]);
907 close(err[1]);
908 error_err:
909 close(out[0]);
910 close(out[1]);
911 error_out:
912 close(in[0]);
913 close(in[1]);
914 error_in:
915 return -1;
916 }
917
918 static int pcloseRWE(int pid, int *rwepipe)
919 {
920 int rc, status;
921 close(rwepipe[0]);
922 close(rwepipe[1]);
923 close(rwepipe[2]);
924 rc = waitpid(pid, &status, 0);
925 return status;
926 }
927
928 static char *shrink_one_url(int *rwepipe, char *big)
929 {
930 int biglen = strlen(big);
931 char *small;
932 int smalllen;
933 int rc;
934
935 rc = dprintf(rwepipe[0], "%s\n", big);
936 if (rc < 0)
937 return big;
938
939 smalllen = biglen + 128;
940 small = malloc(smalllen);
941 if (!small)
942 return big;
943
944 rc = read(rwepipe[1], small, smalllen);
945 if (rc < 0 || rc > biglen)
946 goto error_free_small;
947
948 if (strncmp(small, "http://", 7))
949 goto error_free_small;
950
951 smalllen = rc;
952 while (smalllen && isspace(small[smalllen-1]))
953 small[--smalllen] = 0;
954
955 free(big);
956 return small;
957
958 error_free_small:
959 free(small);
960 return big;
961 }
962
963 static char *shrink_urls(char *text)
964 {
965 int *ranges;
966 int rcount;
967 int i;
968 int inofs = 0;
969 int outofs = 0;
970 const char *const shrink_args[] = {
971 "bti-shrink-urls",
972 NULL
973 };
974 int shrink_pid;
975 int shrink_pipe[3];
976 int inlen = strlen(text);
977
978 dbg("before len=%u\n", inlen);
979
980 shrink_pid = popenRWE(shrink_pipe, shrink_args[0], shrink_args);
981 if (shrink_pid < 0)
982 return text;
983
984 rcount = find_urls(text, &ranges);
985 if (!rcount)
986 return text;
987
988 for (i = 0; i < rcount; i += 2) {
989 int url_start = ranges[i];
990 int url_end = ranges[i+1];
991 int long_url_len = url_end - url_start;
992 char *url = strndup(text + url_start, long_url_len);
993 int short_url_len;
994 int not_url_len = url_start - inofs;
995
996 dbg("long url[%u]: %s\n", long_url_len, url);
997 url = shrink_one_url(shrink_pipe, url);
998 short_url_len = url ? strlen(url) : 0;
999 dbg("short url[%u]: %s\n", short_url_len, url);
1000
1001 if (!url || short_url_len >= long_url_len) {
1002 /* The short url ended up being too long
1003 * or unavailable */
1004 if (inofs) {
1005 strncpy(text + outofs, text + inofs,
1006 not_url_len + long_url_len);
1007 }
1008 inofs += not_url_len + long_url_len;
1009 outofs += not_url_len + long_url_len;
1010
1011 } else {
1012 /* copy the unmodified block */
1013 strncpy(text + outofs, text + inofs, not_url_len);
1014 inofs += not_url_len;
1015 outofs += not_url_len;
1016
1017 /* copy the new url */
1018 strncpy(text + outofs, url, short_url_len);
1019 inofs += long_url_len;
1020 outofs += short_url_len;
1021 }
1022
1023 free(url);
1024 }
1025
1026 /* copy the last block after the last match */
1027 if (inofs) {
1028 int tail = inlen - inofs;
1029 if (tail) {
1030 strncpy(text + outofs, text + inofs, tail);
1031 outofs += tail;
1032 }
1033 }
1034
1035 free(ranges);
1036
1037 (void)pcloseRWE(shrink_pid, shrink_pipe);
1038
1039 text[outofs] = 0;
1040 dbg("after len=%u\n", outofs);
1041 return text;
1042 }
1043
1044 int main(int argc, char *argv[], char *envp[])
1045 {
1046 static const struct option options[] = {
1047 { "debug", 0, NULL, 'd' },
1048 { "verbose", 0, NULL, 'V' },
1049 { "account", 1, NULL, 'a' },
1050 { "password", 1, NULL, 'p' },
1051 { "host", 1, NULL, 'H' },
1052 { "proxy", 1, NULL, 'P' },
1053 { "action", 1, NULL, 'A' },
1054 { "user", 1, NULL, 'u' },
1055 { "group", 1, NULL, 'G' },
1056 { "logfile", 1, NULL, 'L' },
1057 { "shrink-urls", 0, NULL, 's' },
1058 { "help", 0, NULL, 'h' },
1059 { "bash", 0, NULL, 'b' },
1060 { "dry-run", 0, NULL, 'n' },
1061 { "page", 1, NULL, 'g' },
1062 { "version", 0, NULL, 'v' },
1063 { "config", 1, NULL, 'c' },
1064 { }
1065 };
1066 struct session *session;
1067 pid_t child;
1068 char *tweet;
1069 static char password[80];
1070 int retval = 0;
1071 int option;
1072 char *http_proxy;
1073 time_t t;
1074 int page_nr;
1075
1076 debug = 0;
1077 verbose = 0;
1078
1079 session = session_alloc();
1080 if (!session) {
1081 fprintf(stderr, "no more memory...\n");
1082 return -1;
1083 }
1084
1085 /* get the current time so that we can log it later */
1086 time(&t);
1087 session->time = strdup(ctime(&t));
1088 session->time[strlen(session->time)-1] = 0x00;
1089
1090 /* Get the home directory so we can try to find a config file */
1091 session->homedir = strdup(getenv("HOME"));
1092
1093 /* set up a default config file location (traditionally ~/.bti) */
1094 session->configfile = zalloc(strlen(session->homedir) + 7);
1095 sprintf(session->configfile, "%s/.bti", session->homedir);
1096
1097 curl_global_init(CURL_GLOBAL_ALL);
1098
1099 /* Set environment variables first, before reading command line options
1100 * or config file values. */
1101 http_proxy = getenv("http_proxy");
1102 if (http_proxy) {
1103 if (session->proxy)
1104 free(session->proxy);
1105 session->proxy = strdup(http_proxy);
1106 dbg("http_proxy = %s\n", session->proxy);
1107 }
1108
1109 parse_configfile(session);
1110
1111 while (1) {
1112 option = getopt_long_only(argc, argv, "dp:P:H:a:A:u:c:hg:G:snVv",
1113 options, NULL);
1114 if (option == -1)
1115 break;
1116 switch (option) {
1117 case 'd':
1118 debug = 1;
1119 break;
1120 case 'V':
1121 verbose = 1;
1122 break;
1123 case 'a':
1124 if (session->account)
1125 free(session->account);
1126 session->account = strdup(optarg);
1127 dbg("account = %s\n", session->account);
1128 break;
1129 case 'g':
1130 page_nr = atoi(optarg);
1131 dbg("page = %d\n", page_nr);
1132 session->page = page_nr;
1133 break;
1134 case 'p':
1135 if (session->password)
1136 free(session->password);
1137 session->password = strdup(optarg);
1138 dbg("password = %s\n", session->password);
1139 break;
1140 case 'P':
1141 if (session->proxy)
1142 free(session->proxy);
1143 session->proxy = strdup(optarg);
1144 dbg("proxy = %s\n", session->proxy);
1145 break;
1146 case 'A':
1147 if (strcasecmp(optarg, "update") == 0)
1148 session->action = ACTION_UPDATE;
1149 else if (strcasecmp(optarg, "friends") == 0)
1150 session->action = ACTION_FRIENDS;
1151 else if (strcasecmp(optarg, "user") == 0)
1152 session->action = ACTION_USER;
1153 else if (strcasecmp(optarg, "replies") == 0)
1154 session->action = ACTION_REPLIES;
1155 else if (strcasecmp(optarg, "public") == 0)
1156 session->action = ACTION_PUBLIC;
1157 else if (strcasecmp(optarg, "group") == 0)
1158 session->action = ACTION_GROUP;
1159 else
1160 session->action = ACTION_UNKNOWN;
1161 dbg("action = %d\n", session->action);
1162 break;
1163 case 'u':
1164 if (session->user)
1165 free(session->user);
1166 session->user = strdup(optarg);
1167 dbg("user = %s\n", session->user);
1168 break;
1169
1170 case 'G':
1171 if (session->group)
1172 free(session->group);
1173 session->group = strdup(optarg);
1174 dbg("group = %s\n", session->group);
1175 break;
1176 case 'L':
1177 if (session->logfile)
1178 free(session->logfile);
1179 session->logfile = strdup(optarg);
1180 dbg("logfile = %s\n", session->logfile);
1181 break;
1182 case 's':
1183 session->shrink_urls = 1;
1184 break;
1185 case 'H':
1186 if (session->hosturl)
1187 free(session->hosturl);
1188 if (session->hostname)
1189 free(session->hostname);
1190 if (strcasecmp(optarg, "twitter") == 0) {
1191 session->host = HOST_TWITTER;
1192 session->hosturl = strdup(twitter_host);
1193 session->hostname = strdup(twitter_name);
1194 } else if (strcasecmp(optarg, "identica") == 0) {
1195 session->host = HOST_IDENTICA;
1196 session->hosturl = strdup(identica_host);
1197 session->hostname = strdup(identica_name);
1198 } else {
1199 session->host = HOST_CUSTOM;
1200 session->hosturl = strdup(optarg);
1201 session->hostname = strdup(optarg);
1202 }
1203 dbg("host = %d\n", session->host);
1204 break;
1205 case 'b':
1206 session->bash = 1;
1207 break;
1208 case 'c':
1209 if (session->configfile)
1210 free(session->configfile);
1211 session->configfile = strdup(optarg);
1212 dbg("configfile = %s\n", session->configfile);
1213
1214 /*
1215 * read the config file now. Yes, this could override previously
1216 * set options from the command line, but the user asked for it...
1217 */
1218 parse_configfile(session);
1219 break;
1220 case 'h':
1221 display_help();
1222 goto exit;
1223 case 'n':
1224 session->dry_run = 1;
1225 break;
1226 case 'v':
1227 display_version();
1228 goto exit;
1229 default:
1230 display_help();
1231 goto exit;
1232 }
1233 }
1234
1235 session_readline_init(session);
1236 /*
1237 * Show the version to make it easier to determine what
1238 * is going on here
1239 */
1240 if (debug)
1241 display_version();
1242
1243 if (session->action == ACTION_UNKNOWN) {
1244 fprintf(stderr, "Unknown action, valid actions are:\n");
1245 fprintf(stderr, "'update', 'friends', 'public', "
1246 "'replies', 'group' or 'user'.\n");
1247 goto exit;
1248 }
1249
1250 if (session->host == HOST_TWITTER && session->action == ACTION_GROUP) {
1251 fprintf(stderr, "Groups only work in Identi.ca.\n");
1252 goto exit;
1253 }
1254
1255 if (session->action == ACTION_GROUP && !session->group) {
1256 fprintf(stdout, "Enter group name: ");
1257 session->group = session->readline(NULL);
1258 }
1259
1260 if (!session->account) {
1261 fprintf(stdout, "Enter account for %s: ", session->hostname);
1262 session->account = session->readline(NULL);
1263 }
1264
1265 if (!session->password) {
1266 read_password(password, sizeof(password), session->hostname);
1267 session->password = strdup(password);
1268 }
1269
1270 if (session->action == ACTION_UPDATE) {
1271 if (session->bash || !session->interactive)
1272 tweet = get_string_from_stdin();
1273 else
1274 tweet = session->readline("tweet: ");
1275 if (!tweet || strlen(tweet) == 0) {
1276 dbg("no tweet?\n");
1277 return -1;
1278 }
1279
1280 if (session->shrink_urls)
1281 tweet = shrink_urls(tweet);
1282
1283 session->tweet = zalloc(strlen(tweet) + 10);
1284 if (session->bash)
1285 sprintf(session->tweet, "%c %s",
1286 getuid() ? '$' : '#', tweet);
1287 else
1288 sprintf(session->tweet, "%s", tweet);
1289
1290 free(tweet);
1291 dbg("tweet = %s\n", session->tweet);
1292 }
1293
1294 if (!session->user)
1295 session->user = strdup(session->account);
1296
1297 if (session->page == 0)
1298 session->page = 1;
1299 dbg("config file = %s\n", session->configfile);
1300 dbg("account = %s\n", session->account);
1301 dbg("password = %s\n", session->password);
1302 dbg("host = %d\n", session->host);
1303 dbg("action = %d\n", session->action);
1304
1305 /* fork ourself so that the main shell can get on
1306 * with it's life as we try to connect and handle everything
1307 */
1308 if (session->bash) {
1309 child = fork();
1310 if (child) {
1311 dbg("child is %d\n", child);
1312 exit(0);
1313 }
1314 }
1315
1316 retval = send_request(session);
1317 if (retval && !session->bash)
1318 fprintf(stderr, "operation failed\n");
1319
1320 log_session(session, retval);
1321 exit:
1322 session_readline_cleanup(session);
1323 session_free(session);
1324 return retval;;
1325 }

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