[svn-upgrade] new version bti (028)
[debian/bti.git] / bti.c
1 /*
2  * Copyright (C) 2008-2010 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 #include <oauth.h>
43
44
45 #define zalloc(size)    calloc(size, 1)
46
47 #define dbg(format, arg...)                                             \
48         do {                                                            \
49                 if (debug)                                              \
50                         fprintf(stdout, "bti: %s: " format , __func__ , \
51                                 ## arg);                                \
52         } while (0)
53
54
55 static int debug;
56 static int verbose;
57
58 enum host {
59         HOST_TWITTER  = 0,
60         HOST_IDENTICA = 1,
61         HOST_CUSTOM   = 2
62 };
63
64 enum action {
65         ACTION_UPDATE  = 0,
66         ACTION_FRIENDS = 1,
67         ACTION_USER    = 2,
68         ACTION_REPLIES = 4,
69         ACTION_PUBLIC  = 8,
70         ACTION_GROUP   = 16,
71         ACTION_UNKNOWN = 32
72 };
73
74 struct session {
75         char *password;
76         char *account;
77         char *consumer_key;
78         char *consumer_secret;
79         char *access_token_key;
80         char *access_token_secret;
81         char *tweet;
82         char *proxy;
83         char *time;
84         char *homedir;
85         char *logfile;
86         char *user;
87         char *group;
88         char *hosturl;
89         char *hostname;
90         char *configfile;
91         char *replyto;
92         int bash;
93         int background;
94         int interactive;
95         int shrink_urls;
96         int dry_run;
97         int page;
98         int no_oauth;
99         enum host host;
100         enum action action;
101         void *readline_handle;
102         char *(*readline)(const char *);
103 };
104
105 struct bti_curl_buffer {
106         char *data;
107         enum action action;
108         int length;
109 };
110
111 static void display_help(void)
112 {
113         fprintf(stdout, "bti - send tweet to twitter or identi.ca\n"
114                 "Version: %s\n"
115                 "Usage:\n"
116                 "  bti [options]\n"
117                 "options are:\n"
118                 "  --account accountname\n"
119                 "  --password password\n"
120                 "  --action action\n"
121                 "    ('update', 'friends', 'public', 'replies', or 'user')\n"
122                 "  --user screenname\n"
123                 "  --group groupname\n"
124                 "  --proxy PROXY:PORT\n"
125                 "  --host HOST\n"
126                 "  --logfile logfile\n"
127                 "  --config configfile\n"
128                 "  --replyto ID\n"
129                 "  --shrink-urls\n"
130                 "  --page PAGENUMBER\n"
131                 "  --bash\n"
132                 "  --background\n"
133                 "  --debug\n"
134                 "  --verbose\n"
135                 "  --dry-run\n"
136                 "  --version\n"
137                 "  --help\n", VERSION);
138 }
139
140 static void display_version(void)
141 {
142         fprintf(stdout, "bti - version %s\n", VERSION);
143 }
144
145 static char *get_string(const char *name)
146 {
147         char *temp;
148         char *string;
149
150         string = zalloc(1000);
151         if (!string)
152                 exit(1);
153         if (name != NULL)
154                 fprintf(stdout, "%s", name);
155         if (!fgets(string, 999, stdin))
156                 return NULL;
157         temp = strchr(string, '\n');
158         if (temp)
159                 *temp = '\0';
160         return string;
161 }
162
163 /*
164  * Try to get a handle to a readline function from a variety of different
165  * libraries.  If nothing is present on the system, then fall back to an
166  * internal one.
167  *
168  * Logic originally based off of code in the e2fsutils package in the
169  * lib/ss/get_readline.c file, which is licensed under the MIT license.
170  *
171  * This keeps us from having to relicense the bti codebase if readline
172  * ever changes its license, as there is no link-time dependancy.
173  * It is a run-time thing only, and we handle any readline-like library
174  * in the same manner, making bti not be a derivative work of any
175  * other program.
176  */
177 static void session_readline_init(struct session *session)
178 {
179         /* Libraries we will try to use for readline/editline functionality */
180         const char *libpath = "libreadline.so.6:libreadline.so.5:"
181                                 "libreadline.so.4:libreadline.so:libedit.so.2:"
182                                 "libedit.so:libeditline.so.0:libeditline.so";
183         void *handle = NULL;
184         char *tmp, *cp, *next;
185         int (*bind_key)(int, void *);
186         void (*insert)(void);
187
188         /* default to internal function if we can't or won't find anything */
189         session->readline = get_string;
190         if (!isatty(0))
191                 return;
192         session->interactive = 1;
193
194         tmp = malloc(strlen(libpath)+1);
195         if (!tmp)
196                 return;
197         strcpy(tmp, libpath);
198         for (cp = tmp; cp; cp = next) {
199                 next = strchr(cp, ':');
200                 if (next)
201                         *next++ = 0;
202                 if (*cp == 0)
203                         continue;
204                 handle = dlopen(cp, RTLD_NOW);
205                 if (handle) {
206                         dbg("Using %s for readline library\n", cp);
207                         break;
208                 }
209         }
210         free(tmp);
211         if (!handle) {
212                 dbg("No readline library found.\n");
213                 return;
214         }
215
216         session->readline_handle = handle;
217         session->readline = (char *(*)(const char *))dlsym(handle, "readline");
218         if (session->readline == NULL) {
219                 /* something odd happened, default back to internal stuff */
220                 session->readline_handle = NULL;
221                 session->readline = get_string;
222                 return;
223         }
224
225         /*
226          * If we found a library, turn off filename expansion
227          * as that makes no sense from within bti.
228          */
229         bind_key = (int (*)(int, void *))dlsym(handle, "rl_bind_key");
230         insert = (void (*)(void))dlsym(handle, "rl_insert");
231         if (bind_key && insert)
232                 bind_key('\t', insert);
233 }
234
235 static void session_readline_cleanup(struct session *session)
236 {
237         if (session->readline_handle)
238                 dlclose(session->readline_handle);
239 }
240
241 static struct session *session_alloc(void)
242 {
243         struct session *session;
244
245         session = zalloc(sizeof(*session));
246         if (!session)
247                 return NULL;
248         return session;
249 }
250
251 static void session_free(struct session *session)
252 {
253         if (!session)
254                 return;
255         free(session->replyto);
256         free(session->password);
257         free(session->account);
258         free(session->consumer_key);
259         free(session->consumer_secret);
260         free(session->access_token_key);
261         free(session->access_token_secret);
262         free(session->tweet);
263         free(session->proxy);
264         free(session->time);
265         free(session->homedir);
266         free(session->user);
267         free(session->group);
268         free(session->hosturl);
269         free(session->hostname);
270         free(session->configfile);
271         free(session);
272 }
273
274 static struct bti_curl_buffer *bti_curl_buffer_alloc(enum action action)
275 {
276         struct bti_curl_buffer *buffer;
277
278         buffer = zalloc(sizeof(*buffer));
279         if (!buffer)
280                 return NULL;
281
282         /* start out with a data buffer of 1 byte to
283          * make the buffer fill logic simpler */
284         buffer->data = zalloc(1);
285         if (!buffer->data) {
286                 free(buffer);
287                 return NULL;
288         }
289         buffer->length = 0;
290         buffer->action = action;
291         return buffer;
292 }
293
294 static void bti_curl_buffer_free(struct bti_curl_buffer *buffer)
295 {
296         if (!buffer)
297                 return;
298         free(buffer->data);
299         free(buffer);
300 }
301
302 static const char twitter_host[]  = "http://api.twitter.com/1/statuses";
303 static const char identica_host[] = "https://identi.ca/api/statuses";
304 static const char twitter_name[]  = "twitter";
305 static const char identica_name[] = "identi.ca";
306
307 static const char twitter_request_token_uri[]  = "http://twitter.com/oauth/request_token";
308 static const char twitter_access_token_uri[]   = "http://twitter.com/oauth/access_token";
309 static const char twitter_authorize_uri[]      = "http://twitter.com/oauth/authorize?oauth_token=";
310 static const char identica_request_token_uri[] = "http://identi.ca/api/oauth/request_token";
311 static const char identica_access_token_uri[]  = "http://identi.ca/api/oauth/access_token";
312 static const char identica_authorize_uri[]     = "http://identi.ca/api/oauth/authorize?oauth_token=";
313
314 static const char user_uri[]     = "/user_timeline/";
315 static const char update_uri[]   = "/update.xml";
316 static const char public_uri[]   = "/public_timeline.xml";
317 static const char friends_uri[]  = "/friends_timeline.xml";
318 static const char mentions_uri[] = "/mentions.xml";
319 static const char replies_uri[]  = "/replies.xml";
320 static const char group_uri[]    = "/../statusnet/groups/timeline/";
321
322 static CURL *curl_init(void)
323 {
324         CURL *curl;
325
326         curl = curl_easy_init();
327         if (!curl) {
328                 fprintf(stderr, "Can not init CURL!\n");
329                 return NULL;
330         }
331         /* some ssl sanity checks on the connection we are making */
332         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0);
333         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0);
334         return curl;
335 }
336
337 static void parse_statuses(xmlDocPtr doc, xmlNodePtr current)
338 {
339         xmlChar *text = NULL;
340         xmlChar *user = NULL;
341         xmlChar *created = NULL;
342         xmlChar *id = NULL;
343         xmlNodePtr userinfo;
344
345         current = current->xmlChildrenNode;
346         while (current != NULL) {
347                 if (current->type == XML_ELEMENT_NODE) {
348                         if (!xmlStrcmp(current->name, (const xmlChar *)"created_at"))
349                                 created = xmlNodeListGetString(doc, current->xmlChildrenNode, 1);
350                         if (!xmlStrcmp(current->name, (const xmlChar *)"text"))
351                                 text = xmlNodeListGetString(doc, current->xmlChildrenNode, 1);
352                         if (!xmlStrcmp(current->name, (const xmlChar *)"id"))
353                                 id = xmlNodeListGetString(doc, current->xmlChildrenNode, 1);
354                         if (!xmlStrcmp(current->name, (const xmlChar *)"user")) {
355                                 userinfo = current->xmlChildrenNode;
356                                 while (userinfo != NULL) {
357                                         if ((!xmlStrcmp(userinfo->name, (const xmlChar *)"screen_name"))) {
358                                                 if (user)
359                                                         xmlFree(user);
360                                                 user = xmlNodeListGetString(doc, userinfo->xmlChildrenNode, 1);
361                                         }
362                                         userinfo = userinfo->next;
363                                 }
364                         }
365
366                         if (user && text && created && id) {
367                                 if (verbose)
368                                         printf("[%s] {%s} (%.16s) %s\n",
369                                                 user, id, created, text);
370                                 else
371                                         printf("[%s] %s\n",
372                                                 user, text);
373                                 xmlFree(user);
374                                 xmlFree(text);
375                                 xmlFree(created);
376                                 xmlFree(id);
377                                 user = NULL;
378                                 text = NULL;
379                                 created = NULL;
380                                 id = NULL;
381                         }
382                 }
383                 current = current->next;
384         }
385
386         return;
387 }
388
389 static void parse_timeline(char *document)
390 {
391         xmlDocPtr doc;
392         xmlNodePtr current;
393
394         doc = xmlReadMemory(document, strlen(document), "timeline.xml",
395                             NULL, XML_PARSE_NOERROR);
396         if (doc == NULL)
397                 return;
398
399         current = xmlDocGetRootElement(doc);
400         if (current == NULL) {
401                 fprintf(stderr, "empty document\n");
402                 xmlFreeDoc(doc);
403                 return;
404         }
405
406         if (xmlStrcmp(current->name, (const xmlChar *) "statuses")) {
407                 fprintf(stderr, "unexpected document type\n");
408                 xmlFreeDoc(doc);
409                 return;
410         }
411
412         current = current->xmlChildrenNode;
413         while (current != NULL) {
414                 if ((!xmlStrcmp(current->name, (const xmlChar *)"status")))
415                         parse_statuses(doc, current);
416                 current = current->next;
417         }
418         xmlFreeDoc(doc);
419
420         return;
421 }
422
423 static size_t curl_callback(void *buffer, size_t size, size_t nmemb,
424                             void *userp)
425 {
426         struct bti_curl_buffer *curl_buf = userp;
427         size_t buffer_size = size * nmemb;
428         char *temp;
429
430         if ((!buffer) || (!buffer_size) || (!curl_buf))
431                 return -EINVAL;
432
433         /* add to the data we already have */
434         temp = zalloc(curl_buf->length + buffer_size + 1);
435         if (!temp)
436                 return -ENOMEM;
437
438         memcpy(temp, curl_buf->data, curl_buf->length);
439         free(curl_buf->data);
440         curl_buf->data = temp;
441         memcpy(&curl_buf->data[curl_buf->length], (char *)buffer, buffer_size);
442         curl_buf->length += buffer_size;
443         if (curl_buf->action)
444                 parse_timeline(curl_buf->data);
445
446         dbg("%s\n", curl_buf->data);
447
448         return buffer_size;
449 }
450
451 static int parse_osp_reply(const char *reply, char **token, char **secret)
452 {
453         int rc;
454         int retval = 1;
455         char **rv = NULL;
456         rc = oauth_split_url_parameters(reply, &rv);
457         qsort(rv, rc, sizeof(char *), oauth_cmpstringp);
458         if (rc == 2 || rc == 4) {
459                 if (!strncmp(rv[0], "oauth_token=", 11) &&
460                     !strncmp(rv[1], "oauth_token_secret=", 18)) {
461                         if (token)
462                                 *token = strdup(&(rv[0][12]));
463                         if (secret)
464                                 *secret = strdup(&(rv[1][19]));
465
466                         retval = 0;
467                 }
468         } else if (rc == 3) {
469                 if (!strncmp(rv[1], "oauth_token=", 11) &&
470                     !strncmp(rv[2], "oauth_token_secret=", 18)) {
471                         if (token)
472                                 *token = strdup(&(rv[1][12]));
473                         if (secret)
474                                 *secret = strdup(&(rv[2][19]));
475
476                         retval = 0;
477                 }
478         }
479
480         dbg("token: %s\n", *token);
481         dbg("secret: %s\n", *secret);
482
483         if (rv)
484                 free(rv);
485
486         return retval;
487 }
488
489 static int request_access_token(struct session *session)
490 {
491         char *post_params = NULL;
492         char *request_url = NULL;
493         char *reply    = NULL;
494         char *at_key      = NULL;
495         char *at_secret   = NULL;
496         char *verifier    = NULL;
497         char at_uri[90];
498
499         if (!session)
500                 return -EINVAL;
501
502         if (session->host == HOST_TWITTER)
503                 request_url = oauth_sign_url2(
504                                 twitter_request_token_uri, NULL,
505                                 OA_HMAC, NULL, session->consumer_key,
506                                 session->consumer_secret, NULL, NULL);
507         else if (session->host == HOST_IDENTICA)
508                 request_url = oauth_sign_url2(
509                                 identica_request_token_uri, NULL,
510                                 OA_HMAC, NULL, session->consumer_key,
511                                 session->consumer_secret, NULL, NULL);
512         reply = oauth_http_get(request_url, post_params);
513
514         if (request_url)
515                 free(request_url);
516
517         if (post_params)
518                 free(post_params);
519
520         if (!reply)
521                 return 1;
522
523         if (parse_osp_reply(reply, &at_key, &at_secret))
524                 return 1;
525
526         free(reply);
527
528         fprintf(stdout,
529                 "Please open the following link in your browser, and "
530                 "allow 'bti' to access your account. Then paste "
531                 "back the provided PIN in here.\n");
532         if (session->host == HOST_TWITTER) {
533                 fprintf(stdout, "%s%s\nPIN: ", twitter_authorize_uri, at_key);
534                 verifier = session->readline(NULL);
535                 sprintf(at_uri, "%s?oauth_verifier=%s",
536                         twitter_access_token_uri, verifier);
537         } else if (session->host == HOST_IDENTICA) {
538                 fprintf(stdout, "%s%s\nPIN: ", identica_authorize_uri, at_key);
539                 verifier = session->readline(NULL);
540                 sprintf(at_uri, "%s?oauth_verifier=%s",
541                         identica_access_token_uri, verifier);
542         }
543         request_url = oauth_sign_url2(at_uri, NULL, OA_HMAC, NULL,
544                                       session->consumer_key,
545                                       session->consumer_secret,
546                                       at_key, at_secret);
547         reply = oauth_http_get(request_url, post_params);
548
549         if (!reply)
550                 return 1;
551
552         if (parse_osp_reply(reply, &at_key, &at_secret))
553                 return 1;
554
555         free(reply);
556
557         fprintf(stdout,
558                 "Please put these two lines in your bti "
559                 "configuration file (~/.bti):\n"
560                 "access_token_key=%s\n"
561                 "access_token_secret=%s\n",
562                 at_key, at_secret);
563
564         return 0;
565 }
566
567 static int send_request(struct session *session)
568 {
569         char endpoint[500];
570         char user_password[500];
571         char data[500];
572         struct bti_curl_buffer *curl_buf;
573         CURL *curl = NULL;
574         CURLcode res;
575         struct curl_httppost *formpost = NULL;
576         struct curl_httppost *lastptr = NULL;
577         struct curl_slist *slist = NULL;
578         char *req_url = NULL;
579         char *reply = NULL;
580         char *postarg = NULL;
581         char *escaped_tweet = NULL;
582         int is_post = 0;
583
584         if (!session)
585                 return -EINVAL;
586
587         if (!session->hosturl)
588                 session->hosturl = strdup(twitter_host);
589
590         if (session->no_oauth) {
591                 curl_buf = bti_curl_buffer_alloc(session->action);
592                 if (!curl_buf)
593                         return -ENOMEM;
594
595                 curl = curl_init();
596                 if (!curl)
597                         return -EINVAL;
598
599                 if (!session->hosturl)
600                         session->hosturl = strdup(twitter_host);
601
602                 switch (session->action) {
603                 case ACTION_UPDATE:
604                         snprintf(user_password, sizeof(user_password), "%s:%s",
605                                  session->account, session->password);
606                         snprintf(data, sizeof(data), "status=\"%s\"",
607                                  session->tweet);
608                         curl_formadd(&formpost, &lastptr,
609                                      CURLFORM_COPYNAME, "status",
610                                      CURLFORM_COPYCONTENTS, session->tweet,
611                                      CURLFORM_END);
612
613                         curl_formadd(&formpost, &lastptr,
614                                      CURLFORM_COPYNAME, "source",
615                                      CURLFORM_COPYCONTENTS, "bti",
616                                      CURLFORM_END);
617
618                         if (session->replyto)
619                                 curl_formadd(&formpost, &lastptr,
620                                              CURLFORM_COPYNAME, "in_reply_to_status_id",
621                                              CURLFORM_COPYCONTENTS, session->replyto,
622                                              CURLFORM_END);
623
624                         curl_easy_setopt(curl, CURLOPT_HTTPPOST, formpost);
625                         slist = curl_slist_append(slist, "Expect:");
626                         curl_easy_setopt(curl, CURLOPT_HTTPHEADER, slist);
627
628                         sprintf(endpoint, "%s%s", session->hosturl, update_uri);
629                         curl_easy_setopt(curl, CURLOPT_URL, endpoint);
630                         curl_easy_setopt(curl, CURLOPT_USERPWD, user_password);
631                         break;
632
633                 case ACTION_FRIENDS:
634                         snprintf(user_password, sizeof(user_password), "%s:%s",
635                                  session->account, session->password);
636                         sprintf(endpoint, "%s%s?page=%d", session->hosturl,
637                                         friends_uri, session->page);
638                         curl_easy_setopt(curl, CURLOPT_URL, endpoint);
639                         curl_easy_setopt(curl, CURLOPT_USERPWD, user_password);
640                         break;
641
642                 case ACTION_USER:
643                         sprintf(endpoint, "%s%s%s.xml?page=%d", session->hosturl,
644                                 user_uri, session->user, session->page);
645                         curl_easy_setopt(curl, CURLOPT_URL, endpoint);
646                         break;
647
648                 case ACTION_REPLIES:
649                         snprintf(user_password, sizeof(user_password), "%s:%s",
650                                  session->account, session->password);
651                         sprintf(endpoint, "%s%s?page=%d", session->hosturl,
652                                 replies_uri, session->page);
653                         curl_easy_setopt(curl, CURLOPT_URL, endpoint);
654                         curl_easy_setopt(curl, CURLOPT_USERPWD, user_password);
655                         break;
656
657                 case ACTION_PUBLIC:
658                         sprintf(endpoint, "%s%s?page=%d", session->hosturl,
659                                 public_uri, session->page);
660                         curl_easy_setopt(curl, CURLOPT_URL, endpoint);
661                         break;
662
663                 case ACTION_GROUP:
664                         sprintf(endpoint, "%s%s%s.xml?page=%d",
665                                 session->hosturl, group_uri, session->group,
666                                 session->page);
667                         curl_easy_setopt(curl, CURLOPT_URL, endpoint);
668                         break;
669
670                 default:
671                         break;
672                 }
673
674                 if (session->proxy)
675                         curl_easy_setopt(curl, CURLOPT_PROXY, session->proxy);
676
677                 if (debug)
678                         curl_easy_setopt(curl, CURLOPT_VERBOSE, 1);
679
680                 dbg("user_password = %s\n", user_password);
681                 dbg("data = %s\n", data);
682                 dbg("proxy = %s\n", session->proxy);
683
684                 curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, curl_callback);
685                 curl_easy_setopt(curl, CURLOPT_WRITEDATA, curl_buf);
686                 if (!session->dry_run) {
687                         res = curl_easy_perform(curl);
688                         if (res && !session->background) {
689                                 fprintf(stderr, "error(%d) trying to perform "
690                                                 "operation\n", res);
691                                 return -EINVAL;
692                         }
693                 }
694
695                 curl_easy_cleanup(curl);
696                 if (session->action == ACTION_UPDATE)
697                         curl_formfree(formpost);
698                 bti_curl_buffer_free(curl_buf);
699         } else {
700                 switch (session->action) {
701                 case ACTION_UPDATE:
702                         escaped_tweet = oauth_url_escape(session->tweet);
703                         sprintf(endpoint, "%s%s?status=%s", session->hosturl,
704                                 update_uri, escaped_tweet);
705                         is_post = 1;
706                         break;
707                 case ACTION_USER:
708                         sprintf(endpoint, "%s%s%s.xml?page=%d",
709                                 session->hosturl, user_uri, session->user,
710                                 session->page);
711                         break;
712                 case ACTION_REPLIES:
713                         sprintf(endpoint, "%s%s?page=%d", session->hosturl,
714                                 mentions_uri, session->page);
715                         break;
716                 case ACTION_PUBLIC:
717                         sprintf(endpoint, "%s%s?page=%d", session->hosturl,
718                                 public_uri, session->page);
719                         break;
720                 case ACTION_GROUP:
721                         sprintf(endpoint, "%s%s%s.xml?page=%d",
722                                 session->hosturl, group_uri, session->group,
723                                 session->page);
724                         break;
725                 case ACTION_FRIENDS:
726                         sprintf(endpoint, "%s%s?page=%d", session->hosturl,
727                                 friends_uri, session->page);
728                         break;
729                 default:
730                         break;
731                 }
732
733                 if (is_post) {
734                         req_url = oauth_sign_url2(endpoint, &postarg, OA_HMAC,
735                                                   NULL, session->consumer_key,
736                                                   session->consumer_secret,
737                                                   session->access_token_key,
738                                                   session->access_token_secret);
739                         reply = oauth_http_post(req_url, postarg);
740                 } else {
741                         req_url = oauth_sign_url2(endpoint, NULL, OA_HMAC, NULL,
742                                                   session->consumer_key,
743                                                   session->consumer_secret,
744                                                   session->access_token_key,
745                                                   session->access_token_secret);
746                         reply = oauth_http_get(req_url, postarg);
747                 }
748
749                 dbg("%s\n", req_url);
750                 dbg("%s\n", reply);
751                 if (req_url)
752                         free(req_url);
753
754                 if (session->action != ACTION_UPDATE)
755                         parse_timeline(reply);
756         }
757         return 0;
758 }
759
760 static void parse_configfile(struct session *session)
761 {
762         FILE *config_file;
763         char *line = NULL;
764         size_t len = 0;
765         char *account = NULL;
766         char *password = NULL;
767         char *consumer_key = NULL;
768         char *consumer_secret = NULL;
769         char *access_token_key = NULL;
770         char *access_token_secret = NULL;
771         char *host = NULL;
772         char *proxy = NULL;
773         char *logfile = NULL;
774         char *action = NULL;
775         char *user = NULL;
776         char *replyto = NULL;
777         int shrink_urls = 0;
778
779         config_file = fopen(session->configfile, "r");
780
781         /* No error if file does not exist or is unreadable.  */
782         if (config_file == NULL)
783                 return;
784
785         do {
786                 ssize_t n = getline(&line, &len, config_file);
787                 if (n < 0)
788                         break;
789                 if (line[n - 1] == '\n')
790                         line[n - 1] = '\0';
791                 /* Parse file.  Format is the usual value pairs:
792                    account=name
793                    passwort=value
794                    # is a comment character
795                 */
796                 *strchrnul(line, '#') = '\0';
797                 char *c = line;
798                 while (isspace(*c))
799                         c++;
800                 /* Ignore blank lines.  */
801                 if (c[0] == '\0')
802                         continue;
803
804                 if (!strncasecmp(c, "account", 7) && (c[7] == '=')) {
805                         c += 8;
806                         if (c[0] != '\0')
807                                 account = strdup(c);
808                 } else if (!strncasecmp(c, "password", 8) &&
809                            (c[8] == '=')) {
810                         c += 9;
811                         if (c[0] != '\0')
812                                 password = strdup(c);
813                 } else if (!strncasecmp(c, "consumer_key", 12) &&
814                            (c[12] == '=')) {
815                         c += 13;
816                         if (c[0] != '\0')
817                                 consumer_key = strdup(c);
818                 } else if (!strncasecmp(c, "consumer_secret", 15) &&
819                            (c[15] == '=')) {
820                         c += 16;
821                         if (c[0] != '\0')
822                                 consumer_secret = strdup(c);
823                 } else if (!strncasecmp(c, "access_token_key", 16) &&
824                            (c[16] == '=')) {
825                         c += 17;
826                         if (c[0] != '\0')
827                                 access_token_key = strdup(c);
828                 } else if (!strncasecmp(c, "access_token_secret", 19) &&
829                            (c[19] == '=')) {
830                         c += 20;
831                         if (c[0] != '\0')
832                                 access_token_secret = strdup(c);
833                 } else if (!strncasecmp(c, "host", 4) &&
834                            (c[4] == '=')) {
835                         c += 5;
836                         if (c[0] != '\0')
837                                 host = strdup(c);
838                 } else if (!strncasecmp(c, "proxy", 5) &&
839                            (c[5] == '=')) {
840                         c += 6;
841                         if (c[0] != '\0')
842                                 proxy = strdup(c);
843                 } else if (!strncasecmp(c, "logfile", 7) &&
844                            (c[7] == '=')) {
845                         c += 8;
846                         if (c[0] != '\0')
847                                 logfile = strdup(c);
848                 } else if (!strncasecmp(c, "replyto", 7) &&
849                            (c[7] == '=')) {
850                         c += 8;
851                         if (c[0] != '\0')
852                                 replyto = strdup(c);
853                 } else if (!strncasecmp(c, "action", 6) &&
854                            (c[6] == '=')) {
855                         c += 7;
856                         if (c[0] != '\0')
857                                 action = strdup(c);
858                 } else if (!strncasecmp(c, "user", 4) &&
859                                 (c[4] == '=')) {
860                         c += 5;
861                         if (c[0] != '\0')
862                                 user = strdup(c);
863                 } else if (!strncasecmp(c, "shrink-urls", 11) &&
864                                 (c[11] == '=')) {
865                         c += 12;
866                         if (!strncasecmp(c, "true", 4) ||
867                                         !strncasecmp(c, "yes", 3))
868                                 shrink_urls = 1;
869                 } else if (!strncasecmp(c, "verbose", 7) &&
870                                 (c[7] == '=')) {
871                         c += 8;
872                         if (!strncasecmp(c, "true", 4) ||
873                                         !strncasecmp(c, "yes", 3))
874                                 verbose = 1;
875                 }
876         } while (!feof(config_file));
877
878         if (password)
879                 session->password = password;
880         if (account)
881                 session->account = account;
882         if (consumer_key)
883                 session->consumer_key = consumer_key;
884         if (consumer_secret)
885                 session->consumer_secret = consumer_secret;
886         if (access_token_key)
887                 session->access_token_key = access_token_key;
888         if (access_token_secret)
889                 session->access_token_secret = access_token_secret;
890         if (host) {
891                 if (strcasecmp(host, "twitter") == 0) {
892                         session->host = HOST_TWITTER;
893                         session->hosturl = strdup(twitter_host);
894                         session->hostname = strdup(twitter_name);
895                 } else if (strcasecmp(host, "identica") == 0) {
896                         session->host = HOST_IDENTICA;
897                         session->hosturl = strdup(identica_host);
898                         session->hostname = strdup(identica_name);
899                 } else {
900                         session->host = HOST_CUSTOM;
901                         session->hosturl = strdup(host);
902                         session->hostname = strdup(host);
903                 }
904                 free(host);
905         }
906         if (proxy) {
907                 if (session->proxy)
908                         free(session->proxy);
909                 session->proxy = proxy;
910         }
911         if (logfile)
912                 session->logfile = logfile;
913         if (replyto)
914                 session->replyto = replyto;
915         if (action) {
916                 if (strcasecmp(action, "update") == 0)
917                         session->action = ACTION_UPDATE;
918                 else if (strcasecmp(action, "friends") == 0)
919                         session->action = ACTION_FRIENDS;
920                 else if (strcasecmp(action, "user") == 0)
921                         session->action = ACTION_USER;
922                 else if (strcasecmp(action, "replies") == 0)
923                         session->action = ACTION_REPLIES;
924                 else if (strcasecmp(action, "public") == 0)
925                         session->action = ACTION_PUBLIC;
926                 else if (strcasecmp(action, "group") == 0)
927                         session->action = ACTION_GROUP;
928                 else
929                         session->action = ACTION_UNKNOWN;
930                 free(action);
931         }
932         if (user)
933                 session->user = user;
934         session->shrink_urls = shrink_urls;
935
936         /* Free buffer and close file.  */
937         free(line);
938         fclose(config_file);
939 }
940
941 static void log_session(struct session *session, int retval)
942 {
943         FILE *log_file;
944         char *filename;
945
946         /* Only log something if we have a log file set */
947         if (!session->logfile)
948                 return;
949
950         filename = alloca(strlen(session->homedir) +
951                           strlen(session->logfile) + 3);
952
953         sprintf(filename, "%s/%s", session->homedir, session->logfile);
954
955         log_file = fopen(filename, "a+");
956         if (log_file == NULL)
957                 return;
958
959         switch (session->action) {
960         case ACTION_UPDATE:
961                 if (retval)
962                         fprintf(log_file, "%s: host=%s tweet failed\n",
963                                 session->time, session->hostname);
964                 else
965                         fprintf(log_file, "%s: host=%s tweet=%s\n",
966                                 session->time, session->hostname,
967                                 session->tweet);
968                 break;
969         case ACTION_FRIENDS:
970                 fprintf(log_file, "%s: host=%s retrieving friends timeline\n",
971                         session->time, session->hostname);
972                 break;
973         case ACTION_USER:
974                 fprintf(log_file, "%s: host=%s retrieving %s's timeline\n",
975                         session->time, session->hostname, session->user);
976                 break;
977         case ACTION_REPLIES:
978                 fprintf(log_file, "%s: host=%s retrieving replies\n",
979                         session->time, session->hostname);
980                 break;
981         case ACTION_PUBLIC:
982                 fprintf(log_file, "%s: host=%s retrieving public timeline\n",
983                         session->time, session->hostname);
984                 break;
985         case ACTION_GROUP:
986                 fprintf(log_file, "%s: host=%s retrieving group timeline\n",
987                         session->time, session->hostname);
988                 break;
989         default:
990                 break;
991         }
992
993         fclose(log_file);
994 }
995
996 static char *get_string_from_stdin(void)
997 {
998         char *temp;
999         char *string;
1000
1001         string = zalloc(1000);
1002         if (!string)
1003                 return NULL;
1004
1005         if (!fgets(string, 999, stdin))
1006                 return NULL;
1007         temp = strchr(string, '\n');
1008         if (temp)
1009                 *temp = '\0';
1010         return string;
1011 }
1012
1013 static void read_password(char *buf, size_t len, char *host)
1014 {
1015         char pwd[80];
1016         int retval;
1017         struct termios old;
1018         struct termios tp;
1019
1020         tcgetattr(0, &tp);
1021         old = tp;
1022
1023         tp.c_lflag &= (~ECHO);
1024         tcsetattr(0, TCSANOW, &tp);
1025
1026         fprintf(stdout, "Enter password for %s: ", host);
1027         fflush(stdout);
1028         tcflow(0, TCOOFF);
1029         retval = scanf("%79s", pwd);
1030         tcflow(0, TCOON);
1031         fprintf(stdout, "\n");
1032
1033         tcsetattr(0, TCSANOW, &old);
1034
1035         strncpy(buf, pwd, len);
1036         buf[len-1] = '\0';
1037 }
1038
1039 static int find_urls(const char *tweet, int **pranges)
1040 {
1041         /*
1042          * magic obtained from
1043          * http://www.geekpedia.com/KB65_How-to-validate-an-URL-using-RegEx-in-Csharp.html
1044          */
1045         static const char *re_magic =
1046                 "(([a-zA-Z][0-9a-zA-Z+\\-\\.]*:)/{1,3}"
1047                 "[0-9a-zA-Z;/~?:@&=+$\\.\\-_'()%]+)"
1048                 "(#[0-9a-zA-Z;/?:@&=+$\\.\\-_!~*'()%]+)?";
1049         pcre *re;
1050         const char *errptr;
1051         int erroffset;
1052         int ovector[10] = {0,};
1053         const size_t ovsize = sizeof(ovector)/sizeof(*ovector);
1054         int startoffset, tweetlen;
1055         int i, rc;
1056         int rbound = 10;
1057         int rcount = 0;
1058         int *ranges = malloc(sizeof(int) * rbound);
1059
1060         re = pcre_compile(re_magic,
1061                         PCRE_NO_AUTO_CAPTURE,
1062                         &errptr, &erroffset, NULL);
1063         if (!re) {
1064                 fprintf(stderr, "pcre_compile @%u: %s\n", erroffset, errptr);
1065                 exit(1);
1066         }
1067
1068         tweetlen = strlen(tweet);
1069         for (startoffset = 0; startoffset < tweetlen; ) {
1070
1071                 rc = pcre_exec(re, NULL, tweet, strlen(tweet), startoffset, 0,
1072                                 ovector, ovsize);
1073                 if (rc == PCRE_ERROR_NOMATCH)
1074                         break;
1075
1076                 if (rc < 0) {
1077                         fprintf(stderr, "pcre_exec @%u: %s\n",
1078                                 erroffset, errptr);
1079                         exit(1);
1080                 }
1081
1082                 for (i = 0; i < rc; i += 2) {
1083                         if ((rcount+2) == rbound) {
1084                                 rbound *= 2;
1085                                 ranges = realloc(ranges, sizeof(int) * rbound);
1086                         }
1087
1088                         ranges[rcount++] = ovector[i];
1089                         ranges[rcount++] = ovector[i+1];
1090                 }
1091
1092                 startoffset = ovector[1];
1093         }
1094
1095         pcre_free(re);
1096
1097         *pranges = ranges;
1098         return rcount;
1099 }
1100
1101 /**
1102  * bidirectional popen() call
1103  *
1104  * @param rwepipe - int array of size three
1105  * @param exe - program to run
1106  * @param argv - argument list
1107  * @return pid or -1 on error
1108  *
1109  * The caller passes in an array of three integers (rwepipe), on successful
1110  * execution it can then write to element 0 (stdin of exe), and read from
1111  * element 1 (stdout) and 2 (stderr).
1112  */
1113 static int popenRWE(int *rwepipe, const char *exe, const char *const argv[])
1114 {
1115         int in[2];
1116         int out[2];
1117         int err[2];
1118         int pid;
1119         int rc;
1120
1121         rc = pipe(in);
1122         if (rc < 0)
1123                 goto error_in;
1124
1125         rc = pipe(out);
1126         if (rc < 0)
1127                 goto error_out;
1128
1129         rc = pipe(err);
1130         if (rc < 0)
1131                 goto error_err;
1132
1133         pid = fork();
1134         if (pid > 0) {
1135                 /* parent */
1136                 close(in[0]);
1137                 close(out[1]);
1138                 close(err[1]);
1139                 rwepipe[0] = in[1];
1140                 rwepipe[1] = out[0];
1141                 rwepipe[2] = err[0];
1142                 return pid;
1143         } else if (pid == 0) {
1144                 /* child */
1145                 close(in[1]);
1146                 close(out[0]);
1147                 close(err[0]);
1148                 close(0);
1149                 rc = dup(in[0]);
1150                 close(1);
1151                 rc = dup(out[1]);
1152                 close(2);
1153                 rc = dup(err[1]);
1154
1155                 execvp(exe, (char **)argv);
1156                 exit(1);
1157         } else
1158                 goto error_fork;
1159
1160         return pid;
1161
1162 error_fork:
1163         close(err[0]);
1164         close(err[1]);
1165 error_err:
1166         close(out[0]);
1167         close(out[1]);
1168 error_out:
1169         close(in[0]);
1170         close(in[1]);
1171 error_in:
1172         return -1;
1173 }
1174
1175 static int pcloseRWE(int pid, int *rwepipe)
1176 {
1177         int rc, status;
1178         close(rwepipe[0]);
1179         close(rwepipe[1]);
1180         close(rwepipe[2]);
1181         rc = waitpid(pid, &status, 0);
1182         return status;
1183 }
1184
1185 static char *shrink_one_url(int *rwepipe, char *big)
1186 {
1187         int biglen = strlen(big);
1188         char *small;
1189         int smalllen;
1190         int rc;
1191
1192         rc = dprintf(rwepipe[0], "%s\n", big);
1193         if (rc < 0)
1194                 return big;
1195
1196         smalllen = biglen + 128;
1197         small = malloc(smalllen);
1198         if (!small)
1199                 return big;
1200
1201         rc = read(rwepipe[1], small, smalllen);
1202         if (rc < 0 || rc > biglen)
1203                 goto error_free_small;
1204
1205         if (strncmp(small, "http://", 7))
1206                 goto error_free_small;
1207
1208         smalllen = rc;
1209         while (smalllen && isspace(small[smalllen-1]))
1210                         small[--smalllen] = 0;
1211
1212         free(big);
1213         return small;
1214
1215 error_free_small:
1216         free(small);
1217         return big;
1218 }
1219
1220 static char *shrink_urls(char *text)
1221 {
1222         int *ranges;
1223         int rcount;
1224         int i;
1225         int inofs = 0;
1226         int outofs = 0;
1227         const char *const shrink_args[] = {
1228                 "bti-shrink-urls",
1229                 NULL
1230         };
1231         int shrink_pid;
1232         int shrink_pipe[3];
1233         int inlen = strlen(text);
1234
1235         dbg("before len=%u\n", inlen);
1236
1237         shrink_pid = popenRWE(shrink_pipe, shrink_args[0], shrink_args);
1238         if (shrink_pid < 0)
1239                 return text;
1240
1241         rcount = find_urls(text, &ranges);
1242         if (!rcount)
1243                 return text;
1244
1245         for (i = 0; i < rcount; i += 2) {
1246                 int url_start = ranges[i];
1247                 int url_end = ranges[i+1];
1248                 int long_url_len = url_end - url_start;
1249                 char *url = strndup(text + url_start, long_url_len);
1250                 int short_url_len;
1251                 int not_url_len = url_start - inofs;
1252
1253                 dbg("long  url[%u]: %s\n", long_url_len, url);
1254                 url = shrink_one_url(shrink_pipe, url);
1255                 short_url_len = url ? strlen(url) : 0;
1256                 dbg("short url[%u]: %s\n", short_url_len, url);
1257
1258                 if (!url || short_url_len >= long_url_len) {
1259                         /* The short url ended up being too long
1260                          * or unavailable */
1261                         if (inofs) {
1262                                 strncpy(text + outofs, text + inofs,
1263                                                 not_url_len + long_url_len);
1264                         }
1265                         inofs += not_url_len + long_url_len;
1266                         outofs += not_url_len + long_url_len;
1267
1268                 } else {
1269                         /* copy the unmodified block */
1270                         strncpy(text + outofs, text + inofs, not_url_len);
1271                         inofs += not_url_len;
1272                         outofs += not_url_len;
1273
1274                         /* copy the new url */
1275                         strncpy(text + outofs, url, short_url_len);
1276                         inofs += long_url_len;
1277                         outofs += short_url_len;
1278                 }
1279
1280                 free(url);
1281         }
1282
1283         /* copy the last block after the last match */
1284         if (inofs) {
1285                 int tail = inlen - inofs;
1286                 if (tail) {
1287                         strncpy(text + outofs, text + inofs, tail);
1288                         outofs += tail;
1289                 }
1290         }
1291
1292         free(ranges);
1293
1294         (void)pcloseRWE(shrink_pid, shrink_pipe);
1295
1296         text[outofs] = 0;
1297         dbg("after len=%u\n", outofs);
1298         return text;
1299 }
1300
1301 int main(int argc, char *argv[], char *envp[])
1302 {
1303         static const struct option options[] = {
1304                 { "debug", 0, NULL, 'd' },
1305                 { "verbose", 0, NULL, 'V' },
1306                 { "account", 1, NULL, 'a' },
1307                 { "password", 1, NULL, 'p' },
1308                 { "host", 1, NULL, 'H' },
1309                 { "proxy", 1, NULL, 'P' },
1310                 { "action", 1, NULL, 'A' },
1311                 { "user", 1, NULL, 'u' },
1312                 { "group", 1, NULL, 'G' },
1313                 { "logfile", 1, NULL, 'L' },
1314                 { "shrink-urls", 0, NULL, 's' },
1315                 { "help", 0, NULL, 'h' },
1316                 { "bash", 0, NULL, 'b' },
1317                 { "background", 0, NULL, 'B' },
1318                 { "dry-run", 0, NULL, 'n' },
1319                 { "page", 1, NULL, 'g' },
1320                 { "version", 0, NULL, 'v' },
1321                 { "config", 1, NULL, 'c' },
1322                 { "replyto", 1, NULL, 'r' },
1323                 { }
1324         };
1325         struct session *session;
1326         pid_t child;
1327         char *tweet;
1328         static char password[80];
1329         int retval = 0;
1330         int option;
1331         char *http_proxy;
1332         time_t t;
1333         int page_nr;
1334
1335         debug = 0;
1336         verbose = 0;
1337
1338         session = session_alloc();
1339         if (!session) {
1340                 fprintf(stderr, "no more memory...\n");
1341                 return -1;
1342         }
1343
1344         /* get the current time so that we can log it later */
1345         time(&t);
1346         session->time = strdup(ctime(&t));
1347         session->time[strlen(session->time)-1] = 0x00;
1348
1349         /* Get the home directory so we can try to find a config file */
1350         session->homedir = strdup(getenv("HOME"));
1351
1352         /* set up a default config file location (traditionally ~/.bti) */
1353         session->configfile = zalloc(strlen(session->homedir) + 7);
1354         sprintf(session->configfile, "%s/.bti", session->homedir);
1355
1356         /* Set environment variables first, before reading command line options
1357          * or config file values. */
1358         http_proxy = getenv("http_proxy");
1359         if (http_proxy) {
1360                 if (session->proxy)
1361                         free(session->proxy);
1362                 session->proxy = strdup(http_proxy);
1363                 dbg("http_proxy = %s\n", session->proxy);
1364         }
1365
1366         parse_configfile(session);
1367
1368         while (1) {
1369                 option = getopt_long_only(argc, argv,
1370                                           "dp:P:H:a:A:u:c:hg:G:sr:nVv",
1371                                           options, NULL);
1372                 if (option == -1)
1373                         break;
1374                 switch (option) {
1375                 case 'd':
1376                         debug = 1;
1377                         break;
1378                 case 'V':
1379                         verbose = 1;
1380                         break;
1381                 case 'a':
1382                         if (session->account)
1383                                 free(session->account);
1384                         session->account = strdup(optarg);
1385                         dbg("account = %s\n", session->account);
1386                         break;
1387                 case 'g':
1388                         page_nr = atoi(optarg);
1389                         dbg("page = %d\n", page_nr);
1390                         session->page = page_nr;
1391                         break;
1392                 case 'r':
1393                         session->replyto = strdup(optarg);
1394                         dbg("in_reply_to_status_id = %s\n", session->replyto);
1395                         break;
1396                 case 'p':
1397                         if (session->password)
1398                                 free(session->password);
1399                         session->password = strdup(optarg);
1400                         dbg("password = %s\n", session->password);
1401                         break;
1402                 case 'P':
1403                         if (session->proxy)
1404                                 free(session->proxy);
1405                         session->proxy = strdup(optarg);
1406                         dbg("proxy = %s\n", session->proxy);
1407                         break;
1408                 case 'A':
1409                         if (strcasecmp(optarg, "update") == 0)
1410                                 session->action = ACTION_UPDATE;
1411                         else if (strcasecmp(optarg, "friends") == 0)
1412                                 session->action = ACTION_FRIENDS;
1413                         else if (strcasecmp(optarg, "user") == 0)
1414                                 session->action = ACTION_USER;
1415                         else if (strcasecmp(optarg, "replies") == 0)
1416                                 session->action = ACTION_REPLIES;
1417                         else if (strcasecmp(optarg, "public") == 0)
1418                                 session->action = ACTION_PUBLIC;
1419                         else if (strcasecmp(optarg, "group") == 0)
1420                                 session->action = ACTION_GROUP;
1421                         else
1422                                 session->action = ACTION_UNKNOWN;
1423                         dbg("action = %d\n", session->action);
1424                         break;
1425                 case 'u':
1426                         if (session->user)
1427                                 free(session->user);
1428                         session->user = strdup(optarg);
1429                         dbg("user = %s\n", session->user);
1430                         break;
1431
1432                 case 'G':
1433                         if (session->group)
1434                                 free(session->group);
1435                         session->group = strdup(optarg);
1436                         dbg("group = %s\n", session->group);
1437                         break;
1438                 case 'L':
1439                         if (session->logfile)
1440                                 free(session->logfile);
1441                         session->logfile = strdup(optarg);
1442                         dbg("logfile = %s\n", session->logfile);
1443                         break;
1444                 case 's':
1445                         session->shrink_urls = 1;
1446                         break;
1447                 case 'H':
1448                         if (session->hosturl)
1449                                 free(session->hosturl);
1450                         if (session->hostname)
1451                                 free(session->hostname);
1452                         if (strcasecmp(optarg, "twitter") == 0) {
1453                                 session->host = HOST_TWITTER;
1454                                 session->hosturl = strdup(twitter_host);
1455                                 session->hostname = strdup(twitter_name);
1456                         } else if (strcasecmp(optarg, "identica") == 0) {
1457                                 session->host = HOST_IDENTICA;
1458                                 session->hosturl = strdup(identica_host);
1459                                 session->hostname = strdup(identica_name);
1460                         } else {
1461                                 session->host = HOST_CUSTOM;
1462                                 session->hosturl = strdup(optarg);
1463                                 session->hostname = strdup(optarg);
1464                         }
1465                         dbg("host = %d\n", session->host);
1466                         break;
1467                 case 'b':
1468                         session->bash = 1;
1469                         /* fall-through intended */
1470                 case 'B':
1471                         session->background = 1;
1472                         break;
1473                 case 'c':
1474                         if (session->configfile)
1475                                 free(session->configfile);
1476                         session->configfile = strdup(optarg);
1477                         dbg("configfile = %s\n", session->configfile);
1478
1479                         /*
1480                          * read the config file now.  Yes, this could override
1481                          * previously set options from the command line, but
1482                          * the user asked for it...
1483                          */
1484                         parse_configfile(session);
1485                         break;
1486                 case 'h':
1487                         display_help();
1488                         goto exit;
1489                 case 'n':
1490                         session->dry_run = 1;
1491                         break;
1492                 case 'v':
1493                         display_version();
1494                         goto exit;
1495                 default:
1496                         display_help();
1497                         goto exit;
1498                 }
1499         }
1500
1501         session_readline_init(session);
1502         /*
1503          * Show the version to make it easier to determine what
1504          * is going on here
1505          */
1506         if (debug)
1507                 display_version();
1508
1509         if (session->host == HOST_TWITTER) {
1510                 if (!session->consumer_key || !session->consumer_secret) {
1511                         fprintf(stderr,
1512                                 "Twitter no longer supports HTTP basic authentication.\n"
1513                                 "Both consumer key, and consumer secret are required"
1514                                 " for bti in order to behave as an OAuth consumer.\n");
1515                         goto exit;
1516                 }
1517                 if (session->action == ACTION_GROUP) {
1518                         fprintf(stderr, "Groups only work in Identi.ca.\n");
1519                         goto exit;
1520                 }
1521         } else {
1522                 if (!session->consumer_key || !session->consumer_secret)
1523                         session->no_oauth = 1;
1524         }
1525
1526         if (session->no_oauth) {
1527                 if (!session->account) {
1528                         fprintf(stdout, "Enter account for %s: ",
1529                                 session->hostname);
1530                         session->account = session->readline(NULL);
1531                 }
1532                 if (!session->password) {
1533                         read_password(password, sizeof(password),
1534                                       session->hostname);
1535                         session->password = strdup(password);
1536                 }
1537         } else {
1538                 if (!session->access_token_key ||
1539                     !session->access_token_secret) {
1540                         request_access_token(session);
1541                         goto exit;
1542                 }
1543         }
1544
1545         if (session->action == ACTION_UNKNOWN) {
1546                 fprintf(stderr, "Unknown action, valid actions are:\n"
1547                         "'update', 'friends', 'public', 'replies', 'group' or 'user'.\n");
1548                 goto exit;
1549         }
1550
1551         if (session->action == ACTION_GROUP && !session->group) {
1552                 fprintf(stdout, "Enter group name: ");
1553                 session->group = session->readline(NULL);
1554         }
1555
1556         if (session->action == ACTION_UPDATE) {
1557                 if (session->background || !session->interactive)
1558                         tweet = get_string_from_stdin();
1559                 else
1560                         tweet = session->readline("tweet: ");
1561                 if (!tweet || strlen(tweet) == 0) {
1562                         dbg("no tweet?\n");
1563                         return -1;
1564                 }
1565
1566                 if (session->shrink_urls)
1567                         tweet = shrink_urls(tweet);
1568
1569                 session->tweet = zalloc(strlen(tweet) + 10);
1570                 if (session->bash)
1571                         sprintf(session->tweet, "%c %s",
1572                                 getuid() ? '$' : '#', tweet);
1573                 else
1574                         sprintf(session->tweet, "%s", tweet);
1575
1576                 free(tweet);
1577                 dbg("tweet = %s\n", session->tweet);
1578         }
1579
1580         if (session->page == 0)
1581                 session->page = 1;
1582         dbg("config file = %s\n", session->configfile);
1583         dbg("host = %d\n", session->host);
1584         dbg("action = %d\n", session->action);
1585
1586         /* fork ourself so that the main shell can get on
1587          * with it's life as we try to connect and handle everything
1588          */
1589         if (session->background) {
1590                 child = fork();
1591                 if (child) {
1592                         dbg("child is %d\n", child);
1593                         exit(0);
1594                 }
1595         }
1596
1597         retval = send_request(session);
1598         if (retval && !session->background)
1599                 fprintf(stderr, "operation failed\n");
1600
1601         log_session(session, retval);
1602 exit:
1603         session_readline_cleanup(session);
1604         session_free(session);
1605         return retval;;
1606 }