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