[svn-upgrade] Integrating new upstream version, bti (020)
[debian/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  *
5  * This program is free software; you can redistribute it and/or modify it
6  * under the terms of the GNU General Public License as published by the
7  * Free Software Foundation version 2 of the License.
8  *
9  * This program is distributed in the hope that it will be useful, but
10  * WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
12  * General Public License for more details.
13  *
14  * You should have received a copy of the GNU General Public License along
15  * with this program; if not, write to the Free Software Foundation, Inc.,
16  * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
17  */
18
19 #define _GNU_SOURCE
20
21 #include <stdio.h>
22 #include <stdlib.h>
23 #include <stddef.h>
24 #include <string.h>
25 #include <getopt.h>
26 #include <errno.h>
27 #include <ctype.h>
28 #include <fcntl.h>
29 #include <unistd.h>
30 #include <time.h>
31 #include <sys/stat.h>
32 #include <sys/types.h>
33 #include <sys/wait.h>
34 #include <curl/curl.h>
35 #include <readline/readline.h>
36 #include <libxml/xmlmemory.h>
37 #include <libxml/parser.h>
38 #include <libxml/tree.h>
39 #include <pcre.h>
40
41
42 #define zalloc(size)    calloc(size, 1)
43
44 #define dbg(format, arg...)                                             \
45         do {                                                            \
46                 if (debug)                                              \
47                         fprintf(stdout, "bti: %s: " format , __func__ , \
48                                 ## arg);                                \
49         } while (0)
50
51
52 static int debug;
53
54 enum host {
55         HOST_TWITTER = 0,
56         HOST_IDENTICA = 1,
57 };
58
59 enum action {
60         ACTION_UPDATE = 0,
61         ACTION_FRIENDS = 1,
62         ACTION_USER = 2,
63         ACTION_REPLIES = 4,
64         ACTION_PUBLIC = 8,
65         ACTION_UNKNOWN = 16
66 };
67
68 struct session {
69         char *password;
70         char *account;
71         char *tweet;
72         char *proxy;
73         char *time;
74         char *homedir;
75         char *logfile;
76         char *user;
77         int bash;
78         int shrink_urls;
79         int dry_run;
80         int page;
81         enum host host;
82         enum action action;
83 };
84
85 struct bti_curl_buffer {
86         char *data;
87         enum action action;
88         int length;
89 };
90
91 static void display_help(void)
92 {
93         fprintf(stdout, "bti - send tweet to twitter or identi.ca\n");
94         fprintf(stdout, "Version: " VERSION "\n");
95         fprintf(stdout, "Usage:\n");
96         fprintf(stdout, "  bti [options]\n");
97         fprintf(stdout, "options are:\n");
98         fprintf(stdout, "  --account accountname\n");
99         fprintf(stdout, "  --password password\n");
100         fprintf(stdout, "  --action action\n");
101         fprintf(stdout, "    ('update', 'friends', 'public', 'replies' "
102                 "or 'user')\n");
103         fprintf(stdout, "  --user screenname\n");
104         fprintf(stdout, "  --proxy PROXY:PORT\n");
105         fprintf(stdout, "  --host HOST\n");
106         fprintf(stdout, "  --logfile logfile\n");
107         fprintf(stdout, "  --shrink-urls\n");
108         fprintf(stdout, "  --page PAGENUMBER\n");
109         fprintf(stdout, "  --bash\n");
110         fprintf(stdout, "  --debug\n");
111         fprintf(stdout, "  --dry-run\n");
112         fprintf(stdout, "  --version\n");
113         fprintf(stdout, "  --help\n");
114 }
115
116 static void display_version(void)
117 {
118         fprintf(stdout, "bti - version %s\n", VERSION);
119 }
120
121 static struct session *session_alloc(void)
122 {
123         struct session *session;
124
125         session = zalloc(sizeof(*session));
126         if (!session)
127                 return NULL;
128         return session;
129 }
130
131 static void session_free(struct session *session)
132 {
133         if (!session)
134                 return;
135         free(session->password);
136         free(session->account);
137         free(session->tweet);
138         free(session->proxy);
139         free(session->time);
140         free(session->homedir);
141         free(session->user);
142         free(session);
143 }
144
145 static struct bti_curl_buffer *bti_curl_buffer_alloc(enum action action)
146 {
147         struct bti_curl_buffer *buffer;
148
149         buffer = zalloc(sizeof(*buffer));
150         if (!buffer)
151                 return NULL;
152
153         /* start out with a data buffer of 1 byte to
154          * make the buffer fill logic simpler */
155         buffer->data = zalloc(1);
156         if (!buffer->data) {
157                 free(buffer);
158                 return NULL;
159         }
160         buffer->length = 0;
161         buffer->action = action;
162         return buffer;
163 }
164
165 static void bti_curl_buffer_free(struct bti_curl_buffer *buffer)
166 {
167         if (!buffer)
168                 return;
169         free(buffer->data);
170         free(buffer);
171 }
172
173 static const char *twitter_user_url    = "http://twitter.com/statuses/user_timeline/";
174 static const char *twitter_update_url  = "https://twitter.com/statuses/update.xml";
175 static const char *twitter_public_url  = "http://twitter.com/statuses/public_timeline.xml";
176 static const char *twitter_friends_url = "https://twitter.com/statuses/friends_timeline.xml";
177 static const char *twitter_replies_url = "http://twitter.com/statuses/replies.xml";
178
179 static const char *identica_user_url    = "http://identi.ca/api/statuses/user_timeline/";
180 static const char *identica_update_url  = "http://identi.ca/api/statuses/update.xml";
181 static const char *identica_public_url  = "http://identi.ca/api/statuses/public_timeline.xml";
182 static const char *identica_friends_url = "http://identi.ca/api/statuses/friends_timeline.xml";
183 static const char *identica_replies_url = "http://identi.ca/api/statuses/replies.xml";
184
185 static CURL *curl_init(void)
186 {
187         CURL *curl;
188
189         curl = curl_easy_init();
190         if (!curl) {
191                 fprintf(stderr, "Can not init CURL!\n");
192                 return NULL;
193         }
194         /* some ssl sanity checks on the connection we are making */
195         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0);
196         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0);
197         return curl;
198 }
199
200 static void parse_statuses(xmlDocPtr doc, xmlNodePtr current)
201 {
202         xmlChar *text = NULL;
203         xmlChar *user = NULL;
204         xmlNodePtr userinfo;
205
206         current = current->xmlChildrenNode;
207         while (current != NULL) {
208                 if (current->type == XML_ELEMENT_NODE) {
209                         if (!xmlStrcmp(current->name, (const xmlChar *)"text"))
210                                 text = xmlNodeListGetString(doc, current->xmlChildrenNode, 1);
211                         if (!xmlStrcmp(current->name, (const xmlChar *)"user")) {
212                                 userinfo = current->xmlChildrenNode;
213                                 while (userinfo != NULL) {
214                                         if ((!xmlStrcmp(userinfo->name, (const xmlChar *)"screen_name"))) {
215                                                 if (user)
216                                                         xmlFree(user);
217                                                 user = xmlNodeListGetString(doc, userinfo->xmlChildrenNode, 1);
218                                         }
219                                         userinfo = userinfo->next;
220                                 }
221                         }
222                         if (user && text) {
223                                 printf("[%s] %s\n", user, text);
224                                 xmlFree(user);
225                                 xmlFree(text);
226                                 user = NULL;
227                                 text = NULL;
228                         }
229                 }
230                 current = current->next;
231         }
232
233         return;
234 }
235
236 static void parse_timeline(char *document)
237 {
238         xmlDocPtr doc;
239         xmlNodePtr current;
240
241         doc = xmlReadMemory(document, strlen(document), "timeline.xml",
242                             NULL, XML_PARSE_NOERROR);
243         if (doc == NULL)
244                 return;
245
246         current = xmlDocGetRootElement(doc);
247         if (current == NULL) {
248                 fprintf(stderr, "empty document\n");
249                 xmlFreeDoc(doc);
250                 return;
251         }
252
253         if (xmlStrcmp(current->name, (const xmlChar *) "statuses")) {
254                 fprintf(stderr, "unexpected document type\n");
255                 xmlFreeDoc(doc);
256                 return;
257         }
258
259         current = current->xmlChildrenNode;
260         while (current != NULL) {
261                 if ((!xmlStrcmp(current->name, (const xmlChar *)"status")))
262                         parse_statuses(doc, current);
263                 current = current->next;
264         }
265         xmlFreeDoc(doc);
266
267         return;
268 }
269
270 static size_t curl_callback(void *buffer, size_t size, size_t nmemb,
271                             void *userp)
272 {
273         struct bti_curl_buffer *curl_buf = userp;
274         size_t buffer_size = size * nmemb;
275         char *temp;
276
277         if ((!buffer) || (!buffer_size) || (!curl_buf))
278                 return -EINVAL;
279
280         /* add to the data we already have */
281         temp = zalloc(curl_buf->length + buffer_size + 1);
282         if (!temp)
283                 return -ENOMEM;
284
285         memcpy(temp, curl_buf->data, curl_buf->length);
286         free(curl_buf->data);
287         curl_buf->data = temp;
288         memcpy(&curl_buf->data[curl_buf->length], (char *)buffer, buffer_size);
289         curl_buf->length += buffer_size;
290         if (curl_buf->action)
291                 parse_timeline(curl_buf->data);
292
293         dbg("%s\n", curl_buf->data);
294
295         return buffer_size;
296 }
297
298 static int send_request(struct session *session)
299 {
300         char user_password[500];
301         char data[500];
302         /* is there usernames longer than 22 chars? */
303         char user_url[70];
304         struct bti_curl_buffer *curl_buf;
305         CURL *curl = NULL;
306         CURLcode res;
307         struct curl_httppost *formpost = NULL;
308         struct curl_httppost *lastptr = NULL;
309         struct curl_slist *slist = NULL;
310
311         if (!session)
312                 return -EINVAL;
313
314         curl_buf = bti_curl_buffer_alloc(session->action);
315         if (!curl_buf)
316                 return -ENOMEM;
317
318         curl = curl_init();
319         if (!curl)
320                 return -EINVAL;
321
322         switch (session->action) {
323         case ACTION_UPDATE:
324                 snprintf(user_password, sizeof(user_password), "%s:%s",
325                          session->account, session->password);
326                 snprintf(data, sizeof(data), "status=\"%s\"", session->tweet);
327                 curl_formadd(&formpost, &lastptr,
328                              CURLFORM_COPYNAME, "status",
329                              CURLFORM_COPYCONTENTS, session->tweet,
330                              CURLFORM_END);
331
332                 curl_formadd(&formpost, &lastptr,
333                              CURLFORM_COPYNAME, "source",
334                              CURLFORM_COPYCONTENTS, "bti",
335                              CURLFORM_END);
336
337                 curl_easy_setopt(curl, CURLOPT_HTTPPOST, formpost);
338                 slist = curl_slist_append(slist, "Expect:");
339                 curl_easy_setopt(curl, CURLOPT_HTTPHEADER, slist);
340                 switch (session->host) {
341                 case HOST_TWITTER:
342                         curl_easy_setopt(curl, CURLOPT_URL,
343                                          twitter_update_url);
344                         break;
345                 case HOST_IDENTICA:
346                         curl_easy_setopt(curl, CURLOPT_URL,
347                                          identica_update_url);
348                         break;
349                 }
350                 curl_easy_setopt(curl, CURLOPT_USERPWD, user_password);
351
352                 break;
353         case ACTION_FRIENDS:
354                 snprintf(user_password, sizeof(user_password), "%s:%s",
355                          session->account, session->password);
356                 switch (session->host) {
357                 case HOST_TWITTER:
358                         sprintf(user_url, "%s?page=%d", twitter_friends_url, session->page);
359                         curl_easy_setopt(curl, CURLOPT_URL, user_url);
360                         break;
361                 case HOST_IDENTICA:
362                         sprintf(user_url, "%s?page=%d", identica_friends_url, session->page);
363                         curl_easy_setopt(curl, CURLOPT_URL, user_url);
364                         break;
365                 }
366                 curl_easy_setopt(curl, CURLOPT_USERPWD, user_password);
367
368                 break;
369         case ACTION_USER:
370                 switch (session->host) {
371                 case HOST_TWITTER:
372                         sprintf(user_url, "%s%s.xml?page=%d", twitter_user_url, session->user, session->page);
373                         curl_easy_setopt(curl, CURLOPT_URL, user_url);
374                         break;
375                 case HOST_IDENTICA:
376                         sprintf(user_url, "%s%s.xml?page=%d", identica_user_url, session->user, session->page);
377                         curl_easy_setopt(curl, CURLOPT_URL, user_url);
378                         break;
379                 }
380
381                 break;
382         case ACTION_REPLIES:
383                 snprintf(user_password, sizeof(user_password), "%s:%s",
384                          session->account, session->password);
385                 switch (session->host) {
386                 case HOST_TWITTER:
387                         sprintf(user_url, "%s?page=%d", twitter_replies_url, session->page);
388                         curl_easy_setopt(curl, CURLOPT_URL, user_url);
389                         break;
390                 case HOST_IDENTICA:
391                         sprintf(user_url, "%s?page=%d", identica_replies_url, session->page);
392                         curl_easy_setopt(curl, CURLOPT_URL, user_url);
393                         break;
394                 }
395                 curl_easy_setopt(curl, CURLOPT_USERPWD, user_password);
396
397                 break;
398         case ACTION_PUBLIC:
399                 switch (session->host) {
400                 case HOST_TWITTER:
401                         sprintf(user_url, "%s?page=%d", twitter_public_url, session->page);
402                         curl_easy_setopt(curl, CURLOPT_URL, user_url);
403                         break;
404                 case HOST_IDENTICA:
405                         sprintf(user_url, "%s?page=%d", identica_public_url, session->page);
406                         curl_easy_setopt(curl, CURLOPT_URL, user_url);
407                         break;
408                 }
409
410                 break;
411         default:
412                 break;
413         }
414
415         if (session->proxy)
416                 curl_easy_setopt(curl, CURLOPT_PROXY, session->proxy);
417
418         if (debug)
419                 curl_easy_setopt(curl, CURLOPT_VERBOSE, 1);
420
421         dbg("user_password = %s\n", user_password);
422         dbg("data = %s\n", data);
423         dbg("proxy = %s\n", session->proxy);
424
425         curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, curl_callback);
426         curl_easy_setopt(curl, CURLOPT_WRITEDATA, curl_buf);
427         if (!session->dry_run) {
428                 res = curl_easy_perform(curl);
429                 if (res && !session->bash) {
430                         fprintf(stderr, "error(%d) trying to perform "
431                                 "operation\n", res);
432                         return -EINVAL;
433                 }
434         }
435
436         curl_easy_cleanup(curl);
437         if (session->action == ACTION_UPDATE)
438                 curl_formfree(formpost);
439         bti_curl_buffer_free(curl_buf);
440         return 0;
441 }
442
443 static void parse_configfile(struct session *session)
444 {
445         FILE *config_file;
446         char *line = NULL;
447         size_t len = 0;
448         char *account = NULL;
449         char *password = NULL;
450         char *host = NULL;
451         char *proxy = NULL;
452         char *logfile = NULL;
453         char *action = NULL;
454         char *user = NULL;
455         char *file;
456         int shrink_urls = 0;
457
458         /* config file is ~/.bti  */
459         file = alloca(strlen(session->homedir) + 7);
460
461         sprintf(file, "%s/.bti", session->homedir);
462
463         config_file = fopen(file, "r");
464
465         /* No error if file does not exist or is unreadable.  */
466         if (config_file == NULL)
467                 return;
468
469         do {
470                 ssize_t n = getline(&line, &len, config_file);
471                 if (n < 0)
472                         break;
473                 if (line[n - 1] == '\n')
474                         line[n - 1] = '\0';
475                 /* Parse file.  Format is the usual value pairs:
476                    account=name
477                    passwort=value
478                    # is a comment character
479                 */
480                 *strchrnul(line, '#') = '\0';
481                 char *c = line;
482                 while (isspace(*c))
483                         c++;
484                 /* Ignore blank lines.  */
485                 if (c[0] == '\0')
486                         continue;
487
488                 if (!strncasecmp(c, "account", 7) && (c[7] == '=')) {
489                         c += 8;
490                         if (c[0] != '\0')
491                                 account = strdup(c);
492                 } else if (!strncasecmp(c, "password", 8) &&
493                            (c[8] == '=')) {
494                         c += 9;
495                         if (c[0] != '\0')
496                                 password = strdup(c);
497                 } else if (!strncasecmp(c, "host", 4) &&
498                            (c[4] == '=')) {
499                         c += 5;
500                         if (c[0] != '\0')
501                                 host = strdup(c);
502                 } else if (!strncasecmp(c, "proxy", 5) &&
503                            (c[5] == '=')) {
504                         c += 6;
505                         if (c[0] != '\0')
506                                 proxy = strdup(c);
507                 } else if (!strncasecmp(c, "logfile", 7) &&
508                            (c[7] == '=')) {
509                         c += 8;
510                         if (c[0] != '\0')
511                                 logfile = strdup(c);
512                 } else if (!strncasecmp(c, "action", 6) &&
513                            (c[6] == '=')) {
514                         c += 7;
515                         if (c[0] != '\0')
516                                 action = strdup(c);
517                 } else if (!strncasecmp(c, "user", 4) &&
518                                 (c[4] == '=')) {
519                         c += 5;
520                         if (c[0] != '\0')
521                                 user = strdup(c);
522                 } else if (!strncasecmp(c, "shrink-urls", 11) &&
523                                 (c[11] == '=')) {
524                         c += 12;
525                         if (!strncasecmp(c, "true", 4) ||
526                                         !strncasecmp(c, "yes", 3))
527                                 shrink_urls = 1;
528                 }
529         } while (!feof(config_file));
530
531         if (password)
532                 session->password = password;
533         if (account)
534                 session->account = account;
535         if (host) {
536                 if (strcasecmp(host, "twitter") == 0)
537                         session->host = HOST_TWITTER;
538                 if (strcasecmp(host, "identica") == 0)
539                         session->host = HOST_IDENTICA;
540                 free(host);
541         }
542         if (proxy) {
543                 if (session->proxy)
544                         free(session->proxy);
545                 session->proxy = proxy;
546         }
547         if (logfile)
548                 session->logfile = logfile;
549         if (action) {
550                 if (strcasecmp(action, "update") == 0)
551                         session->action = ACTION_UPDATE;
552                 else if (strcasecmp(action, "friends") == 0)
553                         session->action = ACTION_FRIENDS;
554                 else if (strcasecmp(action, "user") == 0)
555                         session->action = ACTION_USER;
556                 else if (strcasecmp(action, "replies") == 0)
557                         session->action = ACTION_REPLIES;
558                 else if (strcasecmp(action, "public") == 0)
559                         session->action = ACTION_PUBLIC;
560                 else
561                         session->action = ACTION_UNKNOWN;
562                 free(action);
563         }
564         if (user)
565                 session->user = user;
566         session->shrink_urls = shrink_urls;
567
568         /* Free buffer and close file.  */
569         free(line);
570         fclose(config_file);
571 }
572
573 static void log_session(struct session *session, int retval)
574 {
575         FILE *log_file;
576         char *filename;
577         char *host;
578
579         /* Only log something if we have a log file set */
580         if (!session->logfile)
581                 return;
582
583         filename = alloca(strlen(session->homedir) +
584                           strlen(session->logfile) + 3);
585
586         sprintf(filename, "%s/%s", session->homedir, session->logfile);
587
588         log_file = fopen(filename, "a+");
589         if (log_file == NULL)
590                 return;
591         switch (session->host) {
592         case HOST_TWITTER:
593                 host = "twitter";
594                 break;
595         case HOST_IDENTICA:
596                 host = "identi.ca";
597                 break;
598         default:
599                 host = "unknown";
600                 break;
601         }
602
603         switch (session->action) {
604         case ACTION_UPDATE:
605                 if (retval)
606                         fprintf(log_file, "%s: host=%s tweet failed\n",
607                                 session->time, host);
608                 else
609                         fprintf(log_file, "%s: host=%s tweet=%s\n",
610                                 session->time, host, session->tweet);
611                 break;
612         case ACTION_FRIENDS:
613                 fprintf(log_file, "%s: host=%s retrieving friends timeline\n",
614                         session->time, host);
615                 break;
616         case ACTION_USER:
617                 fprintf(log_file, "%s: host=%s retrieving %s's timeline\n",
618                         session->time, host, session->user);
619                 break;
620         case ACTION_REPLIES:
621                 fprintf(log_file, "%s: host=%s retrieving replies\n",
622                         session->time, host);
623                 break;
624         case ACTION_PUBLIC:
625                 fprintf(log_file, "%s: host=%s retrieving public timeline\n",
626                         session->time, host);
627                 break;
628         default:
629                 break;
630         }
631
632         fclose(log_file);
633 }
634
635 static char *get_string_from_stdin(void)
636 {
637         char *temp;
638         char *string;
639
640         string = zalloc(1000);
641         if (!string)
642                 return NULL;
643
644         if (!fgets(string, 999, stdin))
645                 return NULL;
646         temp = strchr(string, '\n');
647         *temp = '\0';
648         return string;
649 }
650
651 static int find_urls(const char *tweet, int **pranges)
652 {
653         /*
654          * magic obtained from
655          * http://www.geekpedia.com/KB65_How-to-validate-an-URL-using-RegEx-in-Csharp.html
656          */
657         static const char *re_magic =
658                 "(([a-zA-Z][0-9a-zA-Z+\\-\\.]*:)/{1,3}"
659                 "[0-9a-zA-Z;/~?:@&=+$\\.\\-_'()%]+)"
660                 "(#[0-9a-zA-Z;/?:@&=+$\\.\\-_!~*'()%]+)?";
661         pcre *re;
662         const char *errptr;
663         int erroffset;
664         int ovector[10] = {0,};
665         const size_t ovsize = sizeof(ovector)/sizeof(*ovector);
666         int startoffset, tweetlen;
667         int i, rc;
668         int rbound = 10;
669         int rcount = 0;
670         int *ranges = malloc(sizeof(int) * rbound);
671
672         re = pcre_compile(re_magic,
673                         PCRE_NO_AUTO_CAPTURE,
674                         &errptr, &erroffset, NULL);
675         if (!re) {
676                 fprintf(stderr, "pcre_compile @%u: %s\n", erroffset, errptr);
677                 exit(1);
678         }
679
680         tweetlen = strlen(tweet);
681         for (startoffset = 0; startoffset < tweetlen; ) {
682
683                 rc = pcre_exec(re, NULL, tweet, strlen(tweet), startoffset, 0,
684                                 ovector, ovsize);
685                 if (rc == PCRE_ERROR_NOMATCH)
686                         break;
687
688                 if (rc < 0) {
689                         fprintf(stderr, "pcre_exec @%u: %s\n",
690                                 erroffset, errptr);
691                         exit(1);
692                 }
693
694                 for (i = 0; i < rc; i += 2) {
695                         if ((rcount+2) == rbound) {
696                                 rbound *= 2;
697                                 ranges = realloc(ranges, sizeof(int) * rbound);
698                         }
699
700                         ranges[rcount++] = ovector[i];
701                         ranges[rcount++] = ovector[i+1];
702                 }
703
704                 startoffset = ovector[1];
705         }
706
707         pcre_free(re);
708
709         *pranges = ranges;
710         return rcount;
711 }
712
713 /**
714  * bidirectional popen() call
715  *
716  * @param rwepipe - int array of size three
717  * @param exe - program to run
718  * @param argv - argument list
719  * @return pid or -1 on error
720  *
721  * The caller passes in an array of three integers (rwepipe), on successful
722  * execution it can then write to element 0 (stdin of exe), and read from
723  * element 1 (stdout) and 2 (stderr).
724  */
725 static int popenRWE(int *rwepipe, const char *exe, const char *const argv[])
726 {
727         int in[2];
728         int out[2];
729         int err[2];
730         int pid;
731         int rc;
732
733         rc = pipe(in);
734         if (rc < 0)
735                 goto error_in;
736
737         rc = pipe(out);
738         if (rc < 0)
739                 goto error_out;
740
741         rc = pipe(err);
742         if (rc < 0)
743                 goto error_err;
744
745         pid = fork();
746         if (pid > 0) {
747                 /* parent */
748                 close(in[0]);
749                 close(out[1]);
750                 close(err[1]);
751                 rwepipe[0] = in[1];
752                 rwepipe[1] = out[0];
753                 rwepipe[2] = err[0];
754                 return pid;
755         } else if (pid == 0) {
756                 /* child */
757                 close(in[1]);
758                 close(out[0]);
759                 close(err[0]);
760                 close(0);
761                 rc = dup(in[0]);
762                 close(1);
763                 rc = dup(out[1]);
764                 close(2);
765                 rc = dup(err[1]);
766
767                 execvp(exe, (char **)argv);
768                 exit(1);
769         } else
770                 goto error_fork;
771
772         return pid;
773
774 error_fork:
775         close(err[0]);
776         close(err[1]);
777 error_err:
778         close(out[0]);
779         close(out[1]);
780 error_out:
781         close(in[0]);
782         close(in[1]);
783 error_in:
784         return -1;
785 }
786
787 static int pcloseRWE(int pid, int *rwepipe)
788 {
789         int rc, status;
790         close(rwepipe[0]);
791         close(rwepipe[1]);
792         close(rwepipe[2]);
793         rc = waitpid(pid, &status, 0);
794         return status;
795 }
796
797 static char *shrink_one_url(int *rwepipe, char *big)
798 {
799         int biglen = strlen(big);
800         char *small;
801         int smalllen;
802         int rc;
803
804         rc = dprintf(rwepipe[0], "%s\n", big);
805         if (rc < 0)
806                 return big;
807
808         smalllen = biglen + 128;
809         small = malloc(smalllen);
810         if (!small)
811                 return big;
812
813         rc = read(rwepipe[1], small, smalllen);
814         if (rc < 0 || rc > biglen)
815                 goto error_free_small;
816
817         if (strncmp(small, "http://", 7))
818                 goto error_free_small;
819
820         smalllen = rc;
821         while (smalllen && isspace(small[smalllen-1]))
822                         small[--smalllen] = 0;
823
824         free(big);
825         return small;
826
827 error_free_small:
828         free(small);
829         return big;
830 }
831
832 static char *shrink_urls(char *text)
833 {
834         int *ranges;
835         int rcount;
836         int i;
837         int inofs = 0;
838         int outofs = 0;
839         const char *const shrink_args[] = {
840                 "bti-shrink-urls",
841                 NULL
842         };
843         int shrink_pid;
844         int shrink_pipe[3];
845         int inlen = strlen(text);
846
847         dbg("before len=%u\n", inlen);
848
849         shrink_pid = popenRWE(shrink_pipe, shrink_args[0], shrink_args);
850         if (shrink_pid < 0)
851                 return text;
852
853         rcount = find_urls(text, &ranges);
854         if (!rcount)
855                 return text;
856
857         for (i = 0; i < rcount; i += 2) {
858                 int url_start = ranges[i];
859                 int url_end = ranges[i+1];
860                 int long_url_len = url_end - url_start;
861                 char *url = strndup(text + url_start, long_url_len);
862                 int short_url_len;
863                 int not_url_len = url_start - inofs;
864
865                 dbg("long  url[%u]: %s\n", long_url_len, url);
866                 url = shrink_one_url(shrink_pipe, url);
867                 short_url_len = url ? strlen(url) : 0;
868                 dbg("short url[%u]: %s\n", short_url_len, url);
869
870                 if (!url || short_url_len >= long_url_len) {
871                         /* The short url ended up being too long
872                          * or unavailable */
873                         if (inofs) {
874                                 strncpy(text + outofs, text + inofs,
875                                                 not_url_len + long_url_len);
876                         }
877                         inofs += not_url_len + long_url_len;
878                         outofs += not_url_len + long_url_len;
879
880                 } else {
881                         /* copy the unmodified block */
882                         strncpy(text + outofs, text + inofs, not_url_len);
883                         inofs += not_url_len;
884                         outofs += not_url_len;
885
886                         /* copy the new url */
887                         strncpy(text + outofs, url, short_url_len);
888                         inofs += long_url_len;
889                         outofs += short_url_len;
890                 }
891
892                 free(url);
893         }
894
895         /* copy the last block after the last match */
896         if (inofs) {
897                 int tail = inlen - inofs;
898                 if (tail) {
899                         strncpy(text + outofs, text + inofs, tail);
900                         outofs += tail;
901                 }
902         }
903
904         free(ranges);
905
906         (void)pcloseRWE(shrink_pid, shrink_pipe);
907
908         text[outofs] = 0;
909         dbg("after len=%u\n", outofs);
910         return text;
911 }
912
913 int main(int argc, char *argv[], char *envp[])
914 {
915         static const struct option options[] = {
916                 { "debug", 0, NULL, 'd' },
917                 { "account", 1, NULL, 'a' },
918                 { "password", 1, NULL, 'p' },
919                 { "host", 1, NULL, 'H' },
920                 { "proxy", 1, NULL, 'P' },
921                 { "action", 1, NULL, 'A' },
922                 { "user", 1, NULL, 'u' },
923                 { "logfile", 1, NULL, 'L' },
924                 { "shrink-urls", 0, NULL, 's' },
925                 { "help", 0, NULL, 'h' },
926                 { "bash", 0, NULL, 'b' },
927                 { "dry-run", 0, NULL, 'n' },
928                 { "page", 1, NULL, 'g' },
929                 { "version", 0, NULL, 'v' },
930                 { }
931         };
932         struct session *session;
933         pid_t child;
934         char *tweet;
935         int retval = 0;
936         int option;
937         char *http_proxy;
938         time_t t;
939         int page_nr;
940
941         debug = 0;
942         rl_bind_key('\t', rl_insert);
943
944         session = session_alloc();
945         if (!session) {
946                 fprintf(stderr, "no more memory...\n");
947                 return -1;
948         }
949
950         /* get the current time so that we can log it later */
951         time(&t);
952         session->time = strdup(ctime(&t));
953         session->time[strlen(session->time)-1] = 0x00;
954
955         session->homedir = strdup(getenv("HOME"));
956
957         curl_global_init(CURL_GLOBAL_ALL);
958
959         /* Set environment variables first, before reading command line options
960          * or config file values. */
961         http_proxy = getenv("http_proxy");
962         if (http_proxy) {
963                 if (session->proxy)
964                         free(session->proxy);
965                 session->proxy = strdup(http_proxy);
966                 dbg("http_proxy = %s\n", session->proxy);
967         }
968
969         parse_configfile(session);
970
971         while (1) {
972                 option = getopt_long_only(argc, argv, "dqe:p:P:H:a:A:u:hg:sn",
973                                           options, NULL);
974                 if (option == -1)
975                         break;
976                 switch (option) {
977                 case 'd':
978                         debug = 1;
979                         break;
980                 case 'a':
981                         if (session->account)
982                                 free(session->account);
983                         session->account = strdup(optarg);
984                         dbg("account = %s\n", session->account);
985                         break;
986                 case 'g':
987                         page_nr = atoi(optarg);
988                         dbg("page = %d\n", page_nr);
989                         session->page = page_nr;
990                         break;
991                 case 'p':
992                         if (session->password)
993                                 free(session->password);
994                         session->password = strdup(optarg);
995                         dbg("password = %s\n", session->password);
996                         break;
997                 case 'P':
998                         if (session->proxy)
999                                 free(session->proxy);
1000                         session->proxy = strdup(optarg);
1001                         dbg("proxy = %s\n", session->proxy);
1002                         break;
1003                 case 'A':
1004                         if (strcasecmp(optarg, "update") == 0)
1005                                 session->action = ACTION_UPDATE;
1006                         else if (strcasecmp(optarg, "friends") == 0)
1007                                 session->action = ACTION_FRIENDS;
1008                         else if (strcasecmp(optarg, "user") == 0)
1009                                 session->action = ACTION_USER;
1010                         else if (strcasecmp(optarg, "replies") == 0)
1011                                 session->action = ACTION_REPLIES;
1012                         else if (strcasecmp(optarg, "public") == 0)
1013                                 session->action = ACTION_PUBLIC;
1014                         else
1015                                 session->action = ACTION_UNKNOWN;
1016                         dbg("action = %d\n", session->action);
1017                         break;
1018                 case 'u':
1019                         if (session->user)
1020                                 free(session->user);
1021                         session->user = strdup(optarg);
1022                         dbg("user = %s\n", session->user);
1023                         break;
1024                 case 'L':
1025                         if (session->logfile)
1026                                 free(session->logfile);
1027                         session->logfile = strdup(optarg);
1028                         dbg("logfile = %s\n", session->logfile);
1029                         break;
1030                 case 's':
1031                         session->shrink_urls = 1;
1032                         break;
1033                 case 'H':
1034                         if (strcasecmp(optarg, "twitter") == 0)
1035                                 session->host = HOST_TWITTER;
1036                         if (strcasecmp(optarg, "identica") == 0)
1037                                 session->host = HOST_IDENTICA;
1038                         dbg("host = %d\n", session->host);
1039                         break;
1040                 case 'b':
1041                         session->bash = 1;
1042                         break;
1043                 case 'h':
1044                         display_help();
1045                         goto exit;
1046                 case 'n':
1047                         session->dry_run = 1;
1048                         break;
1049                 case 'v':
1050                         display_version();
1051                         goto exit;
1052                 default:
1053                         display_help();
1054                         goto exit;
1055                 }
1056         }
1057
1058         /*
1059          * Show the version to make it easier to determine what
1060          * is going on here
1061          */
1062         if (debug)
1063                 display_version();
1064
1065         if (session->action == ACTION_UNKNOWN) {
1066                 fprintf(stderr, "Unknown action, valid actions are:\n");
1067                 fprintf(stderr, "'update', 'friends', 'public', "
1068                         "'replies' or 'user'.\n");
1069                 goto exit;
1070         }
1071
1072         if (!session->account) {
1073                 fprintf(stdout, "Enter twitter account: ");
1074                 session->account = readline(NULL);
1075         }
1076
1077         if (!session->password) {
1078                 fprintf(stdout, "Enter twitter password: ");
1079                 session->password = readline(NULL);
1080         }
1081
1082         if (session->action == ACTION_UPDATE) {
1083                 if (session->bash)
1084                         tweet = get_string_from_stdin();
1085                 else
1086                         tweet = readline("tweet: ");
1087                 if (!tweet || strlen(tweet) == 0) {
1088                         dbg("no tweet?\n");
1089                         return -1;
1090                 }
1091
1092                 if (session->shrink_urls)
1093                         tweet = shrink_urls(tweet);
1094
1095                 session->tweet = zalloc(strlen(tweet) + 10);
1096                 if (session->bash)
1097                         sprintf(session->tweet, "%c %s", getuid() ? '$' : '#', tweet);
1098                 else
1099                         sprintf(session->tweet, "%s", tweet);
1100
1101                 free(tweet);
1102                 dbg("tweet = %s\n", session->tweet);
1103         }
1104
1105         if (!session->user)
1106                 session->user = strdup(session->account);
1107
1108         if (session->page == 0)
1109                 session->page = 1;
1110         dbg("account = %s\n", session->account);
1111         dbg("password = %s\n", session->password);
1112         dbg("host = %d\n", session->host);
1113         dbg("action = %d\n", session->action);
1114
1115         /* fork ourself so that the main shell can get on
1116          * with it's life as we try to connect and handle everything
1117          */
1118         if (session->bash) {
1119                 child = fork();
1120                 if (child) {
1121                         dbg("child is %d\n", child);
1122                         exit(0);
1123                 }
1124         }
1125
1126         retval = send_request(session);
1127         if (retval && !session->bash)
1128                 fprintf(stderr, "operation failed\n");
1129
1130         log_session(session, retval);
1131 exit:
1132         session_free(session);
1133         return retval;;
1134 }