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         xmlChar *time = NULL;
 205         xmlNodePtr userinfo;
 206
 207         current = current->xmlChildrenNode;
 208         while (current != NULL) {
 209                 if (current->type == XML_ELEMENT_NODE) {
 210                         if (!xmlStrcmp(current->name, (const xmlChar *)"created_at"))
 211                                 time = xmlNodeListGetString(doc, current->xmlChildrenNode, 1);
 212                         if (!xmlStrcmp(current->name, (const xmlChar *)"text"))
 213                                 text = xmlNodeListGetString(doc, current->xmlChildrenNode, 1);
 214                         if (!xmlStrcmp(current->name, (const xmlChar *)"user")) {
 215                                 userinfo = current->xmlChildrenNode;
 216                                 while (userinfo != NULL) {
 217                                         if ((!xmlStrcmp(userinfo->name, (const xmlChar *)"screen_name"))) {
 218                                                 if (user)
 219                                                         xmlFree(user);
 220                                                 user = xmlNodeListGetString(doc, userinfo->xmlChildrenNode, 1);
 221                                         }
 222                                         userinfo = userinfo->next;
 223                                 }
 224                         }
 225
 226                         if (user && text && time) {
 227                                 printf("[%s] (%.16s) %s\n", user, time, text);
 228                                 xmlFree(user);
 229                                 xmlFree(text);
 230                                 xmlFree(time);
 231                                 user = NULL;
 232                                 text = NULL;
 233                                 time = NULL;
 234                         }
 235                 }
 236                 current = current->next;
 237         }
 238
 239         return;
 240 }
 241
 242 static void parse_timeline(char *document)
 243 {
 244         xmlDocPtr doc;
 245         xmlNodePtr current;
 246
 247         doc = xmlReadMemory(document, strlen(document), "timeline.xml",
 248                             NULL, XML_PARSE_NOERROR);
 249         if (doc == NULL)
 250                 return;
 251
 252         current = xmlDocGetRootElement(doc);
 253         if (current == NULL) {
 254                 fprintf(stderr, "empty document\n");
 255                 xmlFreeDoc(doc);
 256                 return;
 257         }
 258
 259         if (xmlStrcmp(current->name, (const xmlChar *) "statuses")) {
 260                 fprintf(stderr, "unexpected document type\n");
 261                 xmlFreeDoc(doc);
 262                 return;
 263         }
 264
 265         current = current->xmlChildrenNode;
 266         while (current != NULL) {
 267                 if ((!xmlStrcmp(current->name, (const xmlChar *)"status")))
 268                         parse_statuses(doc, current);
 269                 current = current->next;
 270         }
 271         xmlFreeDoc(doc);
 272
 273         return;
 274 }
 275
 276 static size_t curl_callback(void *buffer, size_t size, size_t nmemb,
 277                             void *userp)
 278 {
 279         struct bti_curl_buffer *curl_buf = userp;
 280         size_t buffer_size = size * nmemb;
 281         char *temp;
 282
 283         if ((!buffer) || (!buffer_size) || (!curl_buf))
 284                 return -EINVAL;
 285
 286         /* add to the data we already have */
 287         temp = zalloc(curl_buf->length + buffer_size + 1);
 288         if (!temp)
 289                 return -ENOMEM;
 290
 291         memcpy(temp, curl_buf->data, curl_buf->length);
 292         free(curl_buf->data);
 293         curl_buf->data = temp;
 294         memcpy(&curl_buf->data[curl_buf->length], (char *)buffer, buffer_size);
 295         curl_buf->length += buffer_size;
 296         if (curl_buf->action)
 297                 parse_timeline(curl_buf->data);
 298
 299         dbg("%s\n", curl_buf->data);
 300
 301         return buffer_size;
 302 }
 303
 304 static int send_request(struct session *session)
 305 {
 306         char user_password[500];
 307         char data[500];
 308         /* is there usernames longer than 22 chars? */
 309         char user_url[70];
 310         struct bti_curl_buffer *curl_buf;
 311         CURL *curl = NULL;
 312         CURLcode res;
 313         struct curl_httppost *formpost = NULL;
 314         struct curl_httppost *lastptr = NULL;
 315         struct curl_slist *slist = NULL;
 316
 317         if (!session)
 318                 return -EINVAL;
 319
 320         curl_buf = bti_curl_buffer_alloc(session->action);
 321         if (!curl_buf)
 322                 return -ENOMEM;
 323
 324         curl = curl_init();
 325         if (!curl)
 326                 return -EINVAL;
 327
 328         switch (session->action) {
 329         case ACTION_UPDATE:
 330                 snprintf(user_password, sizeof(user_password), "%s:%s",
 331                          session->account, session->password);
 332                 snprintf(data, sizeof(data), "status=\"%s\"", session->tweet);
 333                 curl_formadd(&formpost, &lastptr,
 334                              CURLFORM_COPYNAME, "status",
 335                              CURLFORM_COPYCONTENTS, session->tweet,
 336                              CURLFORM_END);
 337
 338                 curl_formadd(&formpost, &lastptr,
 339                              CURLFORM_COPYNAME, "source",
 340                              CURLFORM_COPYCONTENTS, "bti",
 341                              CURLFORM_END);
 342
 343                 curl_easy_setopt(curl, CURLOPT_HTTPPOST, formpost);
 344                 slist = curl_slist_append(slist, "Expect:");
 345                 curl_easy_setopt(curl, CURLOPT_HTTPHEADER, slist);
 346                 switch (session->host) {
 347                 case HOST_TWITTER:
 348                         curl_easy_setopt(curl, CURLOPT_URL,
 349                                          twitter_update_url);
 350                         break;
 351                 case HOST_IDENTICA:
 352                         curl_easy_setopt(curl, CURLOPT_URL,
 353                                          identica_update_url);
 354                         break;
 355                 }
 356                 curl_easy_setopt(curl, CURLOPT_USERPWD, user_password);
 357
 358                 break;
 359         case ACTION_FRIENDS:
 360                 snprintf(user_password, sizeof(user_password), "%s:%s",
 361                          session->account, session->password);
 362                 switch (session->host) {
 363                 case HOST_TWITTER:
 364                         sprintf(user_url, "%s?page=%d", twitter_friends_url, session->page);
 365                         curl_easy_setopt(curl, CURLOPT_URL, user_url);
 366                         break;
 367                 case HOST_IDENTICA:
 368                         sprintf(user_url, "%s?page=%d", identica_friends_url, session->page);
 369                         curl_easy_setopt(curl, CURLOPT_URL, user_url);
 370                         break;
 371                 }
 372                 curl_easy_setopt(curl, CURLOPT_USERPWD, user_password);
 373
 374                 break;
 375         case ACTION_USER:
 376                 switch (session->host) {
 377                 case HOST_TWITTER:
 378                         sprintf(user_url, "%s%s.xml?page=%d", twitter_user_url, session->user, session->page);
 379                         curl_easy_setopt(curl, CURLOPT_URL, user_url);
 380                         break;
 381                 case HOST_IDENTICA:
 382                         sprintf(user_url, "%s%s.xml?page=%d", identica_user_url, session->user, session->page);
 383                         curl_easy_setopt(curl, CURLOPT_URL, user_url);
 384                         break;
 385                 }
 386
 387                 break;
 388         case ACTION_REPLIES:
 389                 snprintf(user_password, sizeof(user_password), "%s:%s",
 390                          session->account, session->password);
 391                 switch (session->host) {
 392                 case HOST_TWITTER:
 393                         sprintf(user_url, "%s?page=%d", twitter_replies_url, session->page);
 394                         curl_easy_setopt(curl, CURLOPT_URL, user_url);
 395                         break;
 396                 case HOST_IDENTICA:
 397                         sprintf(user_url, "%s?page=%d", identica_replies_url, session->page);
 398                         curl_easy_setopt(curl, CURLOPT_URL, user_url);
 399                         break;
 400                 }
 401                 curl_easy_setopt(curl, CURLOPT_USERPWD, user_password);
 402
 403                 break;
 404         case ACTION_PUBLIC:
 405                 switch (session->host) {
 406                 case HOST_TWITTER:
 407                         sprintf(user_url, "%s?page=%d", twitter_public_url, session->page);
 408                         curl_easy_setopt(curl, CURLOPT_URL, user_url);
 409                         break;
 410                 case HOST_IDENTICA:
 411                         sprintf(user_url, "%s?page=%d", identica_public_url, session->page);
 412                         curl_easy_setopt(curl, CURLOPT_URL, user_url);
 413                         break;
 414                 }
 415
 416                 break;
 417         default:
 418                 break;
 419         }
 420
 421         if (session->proxy)
 422                 curl_easy_setopt(curl, CURLOPT_PROXY, session->proxy);
 423
 424         if (debug)
 425                 curl_easy_setopt(curl, CURLOPT_VERBOSE, 1);
 426
 427         dbg("user_password = %s\n", user_password);
 428         dbg("data = %s\n", data);
 429         dbg("proxy = %s\n", session->proxy);
 430
 431         curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, curl_callback);
 432         curl_easy_setopt(curl, CURLOPT_WRITEDATA, curl_buf);
 433         if (!session->dry_run) {
 434                 res = curl_easy_perform(curl);
 435                 if (res && !session->bash) {
 436                         fprintf(stderr, "error(%d) trying to perform "
 437                                 "operation\n", res);
 438                         return -EINVAL;
 439                 }
 440         }
 441
 442         curl_easy_cleanup(curl);
 443         if (session->action == ACTION_UPDATE)
 444                 curl_formfree(formpost);
 445         bti_curl_buffer_free(curl_buf);
 446         return 0;
 447 }
 448
 449 static void parse_configfile(struct session *session)
 450 {
 451         FILE *config_file;
 452         char *line = NULL;
 453         size_t len = 0;
 454         char *account = NULL;
 455         char *password = NULL;
 456         char *host = NULL;
 457         char *proxy = NULL;
 458         char *logfile = NULL;
 459         char *action = NULL;
 460         char *user = NULL;
 461         char *file;
 462         int shrink_urls = 0;
 463
 464         /* config file is ~/.bti  */
 465         file = alloca(strlen(session->homedir) + 7);
 466
 467         sprintf(file, "%s/.bti", session->homedir);
 468
 469         config_file = fopen(file, "r");
 470
 471         /* No error if file does not exist or is unreadable.  */
 472         if (config_file == NULL)
 473                 return;
 474
 475         do {
 476                 ssize_t n = getline(&line, &len, config_file);
 477                 if (n < 0)
 478                         break;
 479                 if (line[n - 1] == '\n')
 480                         line[n - 1] = '\0';
 481                 /* Parse file.  Format is the usual value pairs:
 482                    account=name
 483                    passwort=value
 484                    # is a comment character
 485                 */
 486                 *strchrnul(line, '#') = '\0';
 487                 char *c = line;
 488                 while (isspace(*c))
 489                         c++;
 490                 /* Ignore blank lines.  */
 491                 if (c[0] == '\0')
 492                         continue;
 493
 494                 if (!strncasecmp(c, "account", 7) && (c[7] == '=')) {
 495                         c += 8;
 496                         if (c[0] != '\0')
 497                                 account = strdup(c);
 498                 } else if (!strncasecmp(c, "password", 8) &&
 499                            (c[8] == '=')) {
 500                         c += 9;
 501                         if (c[0] != '\0')
 502                                 password = strdup(c);
 503                 } else if (!strncasecmp(c, "host", 4) &&
 504                            (c[4] == '=')) {
 505                         c += 5;
 506                         if (c[0] != '\0')
 507                                 host = strdup(c);
 508                 } else if (!strncasecmp(c, "proxy", 5) &&
 509                            (c[5] == '=')) {
 510                         c += 6;
 511                         if (c[0] != '\0')
 512                                 proxy = strdup(c);
 513                 } else if (!strncasecmp(c, "logfile", 7) &&
 514                            (c[7] == '=')) {
 515                         c += 8;
 516                         if (c[0] != '\0')
 517                                 logfile = strdup(c);
 518                 } else if (!strncasecmp(c, "action", 6) &&
 519                            (c[6] == '=')) {
 520                         c += 7;
 521                         if (c[0] != '\0')
 522                                 action = strdup(c);
 523                 } else if (!strncasecmp(c, "user", 4) &&
 524                                 (c[4] == '=')) {
 525                         c += 5;
 526                         if (c[0] != '\0')
 527                                 user = strdup(c);
 528                 } else if (!strncasecmp(c, "shrink-urls", 11) &&
 529                                 (c[11] == '=')) {
 530                         c += 12;
 531                         if (!strncasecmp(c, "true", 4) ||
 532                                         !strncasecmp(c, "yes", 3))
 533                                 shrink_urls = 1;
 534                 }
 535         } while (!feof(config_file));
 536
 537         if (password)
 538                 session->password = password;
 539         if (account)
 540                 session->account = account;
 541         if (host) {
 542                 if (strcasecmp(host, "twitter") == 0)
 543                         session->host = HOST_TWITTER;
 544                 if (strcasecmp(host, "identica") == 0)
 545                         session->host = HOST_IDENTICA;
 546                 free(host);
 547         }
 548         if (proxy) {
 549                 if (session->proxy)
 550                         free(session->proxy);
 551                 session->proxy = proxy;
 552         }
 553         if (logfile)
 554                 session->logfile = logfile;
 555         if (action) {
 556                 if (strcasecmp(action, "update") == 0)
 557                         session->action = ACTION_UPDATE;
 558                 else if (strcasecmp(action, "friends") == 0)
 559                         session->action = ACTION_FRIENDS;
 560                 else if (strcasecmp(action, "user") == 0)
 561                         session->action = ACTION_USER;
 562                 else if (strcasecmp(action, "replies") == 0)
 563                         session->action = ACTION_REPLIES;
 564                 else if (strcasecmp(action, "public") == 0)
 565                         session->action = ACTION_PUBLIC;
 566                 else
 567                         session->action = ACTION_UNKNOWN;
 568                 free(action);
 569         }
 570         if (user)
 571                 session->user = user;
 572         session->shrink_urls = shrink_urls;
 573
 574         /* Free buffer and close file.  */
 575         free(line);
 576         fclose(config_file);
 577 }
 578
 579 static void log_session(struct session *session, int retval)
 580 {
 581         FILE *log_file;
 582         char *filename;
 583         char *host;
 584
 585         /* Only log something if we have a log file set */
 586         if (!session->logfile)
 587                 return;
 588
 589         filename = alloca(strlen(session->homedir) +
 590                           strlen(session->logfile) + 3);
 591
 592         sprintf(filename, "%s/%s", session->homedir, session->logfile);
 593
 594         log_file = fopen(filename, "a+");
 595         if (log_file == NULL)
 596                 return;
 597         switch (session->host) {
 598         case HOST_TWITTER:
 599                 host = "twitter";
 600                 break;
 601         case HOST_IDENTICA:
 602                 host = "identi.ca";
 603                 break;
 604         default:
 605                 host = "unknown";
 606                 break;
 607         }
 608
 609         switch (session->action) {
 610         case ACTION_UPDATE:
 611                 if (retval)
 612                         fprintf(log_file, "%s: host=%s tweet failed\n",
 613                                 session->time, host);
 614                 else
 615                         fprintf(log_file, "%s: host=%s tweet=%s\n",
 616                                 session->time, host, session->tweet);
 617                 break;
 618         case ACTION_FRIENDS:
 619                 fprintf(log_file, "%s: host=%s retrieving friends timeline\n",
 620                         session->time, host);
 621                 break;
 622         case ACTION_USER:
 623                 fprintf(log_file, "%s: host=%s retrieving %s's timeline\n",
 624                         session->time, host, session->user);
 625                 break;
 626         case ACTION_REPLIES:
 627                 fprintf(log_file, "%s: host=%s retrieving replies\n",
 628                         session->time, host);
 629                 break;
 630         case ACTION_PUBLIC:
 631                 fprintf(log_file, "%s: host=%s retrieving public timeline\n",
 632                         session->time, host);
 633                 break;
 634         default:
 635                 break;
 636         }
 637
 638         fclose(log_file);
 639 }
 640
 641 static char *get_string_from_stdin(void)
 642 {
 643         char *temp;
 644         char *string;
 645
 646         string = zalloc(1000);
 647         if (!string)
 648                 return NULL;
 649
 650         if (!fgets(string, 999, stdin))
 651                 return NULL;
 652         temp = strchr(string, '\n');
 653         *temp = '\0';
 654         return string;
 655 }
 656
 657 static int find_urls(const char *tweet, int **pranges)
 658 {
 659         /*
 660          * magic obtained from
 661          * http://www.geekpedia.com/KB65_How-to-validate-an-URL-using-RegEx-in-Csharp.html
 662          */
 663         static const char *re_magic =
 664                 "(([a-zA-Z][0-9a-zA-Z+\\-\\.]*:)/{1,3}"
 665                 "[0-9a-zA-Z;/~?:@&=+$\\.\\-_'()%]+)"
 666                 "(#[0-9a-zA-Z;/?:@&=+$\\.\\-_!~*'()%]+)?";
 667         pcre *re;
 668         const char *errptr;
 669         int erroffset;
 670         int ovector[10] = {0,};
 671         const size_t ovsize = sizeof(ovector)/sizeof(*ovector);
 672         int startoffset, tweetlen;
 673         int i, rc;
 674         int rbound = 10;
 675         int rcount = 0;
 676         int *ranges = malloc(sizeof(int) * rbound);
 677
 678         re = pcre_compile(re_magic,
 679                         PCRE_NO_AUTO_CAPTURE,
 680                         &errptr, &erroffset, NULL);
 681         if (!re) {
 682                 fprintf(stderr, "pcre_compile @%u: %s\n", erroffset, errptr);
 683                 exit(1);
 684         }
 685
 686         tweetlen = strlen(tweet);
 687         for (startoffset = 0; startoffset < tweetlen; ) {
 688
 689                 rc = pcre_exec(re, NULL, tweet, strlen(tweet), startoffset, 0,
 690                                 ovector, ovsize);
 691                 if (rc == PCRE_ERROR_NOMATCH)
 692                         break;
 693
 694                 if (rc < 0) {
 695                         fprintf(stderr, "pcre_exec @%u: %s\n",
 696                                 erroffset, errptr);
 697                         exit(1);
 698                 }
 699
 700                 for (i = 0; i < rc; i += 2) {
 701                         if ((rcount+2) == rbound) {
 702                                 rbound *= 2;
 703                                 ranges = realloc(ranges, sizeof(int) * rbound);
 704                         }
 705
 706                         ranges[rcount++] = ovector[i];
 707                         ranges[rcount++] = ovector[i+1];
 708                 }
 709
 710                 startoffset = ovector[1];
 711         }
 712
 713         pcre_free(re);
 714
 715         *pranges = ranges;
 716         return rcount;
 717 }
 718
 719 /**
 720  * bidirectional popen() call
 721  *
 722  * @param rwepipe - int array of size three
 723  * @param exe - program to run
 724  * @param argv - argument list
 725  * @return pid or -1 on error
 726  *
 727  * The caller passes in an array of three integers (rwepipe), on successful
 728  * execution it can then write to element 0 (stdin of exe), and read from
 729  * element 1 (stdout) and 2 (stderr).
 730  */
 731 static int popenRWE(int *rwepipe, const char *exe, const char *const argv[])
 732 {
 733         int in[2];
 734         int out[2];
 735         int err[2];
 736         int pid;
 737         int rc;
 738
 739         rc = pipe(in);
 740         if (rc < 0)
 741                 goto error_in;
 742
 743         rc = pipe(out);
 744         if (rc < 0)
 745                 goto error_out;
 746
 747         rc = pipe(err);
 748         if (rc < 0)
 749                 goto error_err;
 750
 751         pid = fork();
 752         if (pid > 0) {
 753                 /* parent */
 754                 close(in[0]);
 755                 close(out[1]);
 756                 close(err[1]);
 757                 rwepipe[0] = in[1];
 758                 rwepipe[1] = out[0];
 759                 rwepipe[2] = err[0];
 760                 return pid;
 761         } else if (pid == 0) {
 762                 /* child */
 763                 close(in[1]);
 764                 close(out[0]);
 765                 close(err[0]);
 766                 close(0);
 767                 rc = dup(in[0]);
 768                 close(1);
 769                 rc = dup(out[1]);
 770                 close(2);
 771                 rc = dup(err[1]);
 772
 773                 execvp(exe, (char **)argv);
 774                 exit(1);
 775         } else
 776                 goto error_fork;
 777
 778         return pid;
 779
 780 error_fork:
 781         close(err[0]);
 782         close(err[1]);
 783 error_err:
 784         close(out[0]);
 785         close(out[1]);
 786 error_out:
 787         close(in[0]);
 788         close(in[1]);
 789 error_in:
 790         return -1;
 791 }
 792
 793 static int pcloseRWE(int pid, int *rwepipe)
 794 {
 795         int rc, status;
 796         close(rwepipe[0]);
 797         close(rwepipe[1]);
 798         close(rwepipe[2]);
 799         rc = waitpid(pid, &status, 0);
 800         return status;
 801 }
 802
 803 static char *shrink_one_url(int *rwepipe, char *big)
 804 {
 805         int biglen = strlen(big);
 806         char *small;
 807         int smalllen;
 808         int rc;
 809
 810         rc = dprintf(rwepipe[0], "%s\n", big);
 811         if (rc < 0)
 812                 return big;
 813
 814         smalllen = biglen + 128;
 815         small = malloc(smalllen);
 816         if (!small)
 817                 return big;
 818
 819         rc = read(rwepipe[1], small, smalllen);
 820         if (rc < 0 || rc > biglen)
 821                 goto error_free_small;
 822
 823         if (strncmp(small, "http://", 7))
 824                 goto error_free_small;
 825
 826         smalllen = rc;
 827         while (smalllen && isspace(small[smalllen-1]))
 828                         small[--smalllen] = 0;
 829
 830         free(big);
 831         return small;
 832
 833 error_free_small:
 834         free(small);
 835         return big;
 836 }
 837
 838 static char *shrink_urls(char *text)
 839 {
 840         int *ranges;
 841         int rcount;
 842         int i;
 843         int inofs = 0;
 844         int outofs = 0;
 845         const char *const shrink_args[] = {
 846                 "bti-shrink-urls",
 847                 NULL
 848         };
 849         int shrink_pid;
 850         int shrink_pipe[3];
 851         int inlen = strlen(text);
 852
 853         dbg("before len=%u\n", inlen);
 854
 855         shrink_pid = popenRWE(shrink_pipe, shrink_args[0], shrink_args);
 856         if (shrink_pid < 0)
 857                 return text;
 858
 859         rcount = find_urls(text, &ranges);
 860         if (!rcount)
 861                 return text;
 862
 863         for (i = 0; i < rcount; i += 2) {
 864                 int url_start = ranges[i];
 865                 int url_end = ranges[i+1];
 866                 int long_url_len = url_end - url_start;
 867                 char *url = strndup(text + url_start, long_url_len);
 868                 int short_url_len;
 869                 int not_url_len = url_start - inofs;
 870
 871                 dbg("long  url[%u]: %s\n", long_url_len, url);
 872                 url = shrink_one_url(shrink_pipe, url);
 873                 short_url_len = url ? strlen(url) : 0;
 874                 dbg("short url[%u]: %s\n", short_url_len, url);
 875
 876                 if (!url || short_url_len >= long_url_len) {
 877                         /* The short url ended up being too long
 878                          * or unavailable */
 879                         if (inofs) {
 880                                 strncpy(text + outofs, text + inofs,
 881                                                 not_url_len + long_url_len);
 882                         }
 883                         inofs += not_url_len + long_url_len;
 884                         outofs += not_url_len + long_url_len;
 885
 886                 } else {
 887                         /* copy the unmodified block */
 888                         strncpy(text + outofs, text + inofs, not_url_len);
 889                         inofs += not_url_len;
 890                         outofs += not_url_len;
 891
 892                         /* copy the new url */
 893                         strncpy(text + outofs, url, short_url_len);
 894                         inofs += long_url_len;
 895                         outofs += short_url_len;
 896                 }
 897
 898                 free(url);
 899         }
 900
 901         /* copy the last block after the last match */
 902         if (inofs) {
 903                 int tail = inlen - inofs;
 904                 if (tail) {
 905                         strncpy(text + outofs, text + inofs, tail);
 906                         outofs += tail;
 907                 }
 908         }
 909
 910         free(ranges);
 911
 912         (void)pcloseRWE(shrink_pid, shrink_pipe);
 913
 914         text[outofs] = 0;
 915         dbg("after len=%u\n", outofs);
 916         return text;
 917 }
 918
 919 int main(int argc, char *argv[], char *envp[])
 920 {
 921         static const struct option options[] = {
 922                 { "debug", 0, NULL, 'd' },
 923                 { "account", 1, NULL, 'a' },
 924                 { "password", 1, NULL, 'p' },
 925                 { "host", 1, NULL, 'H' },
 926                 { "proxy", 1, NULL, 'P' },
 927                 { "action", 1, NULL, 'A' },
 928                 { "user", 1, NULL, 'u' },
 929                 { "logfile", 1, NULL, 'L' },
 930                 { "shrink-urls", 0, NULL, 's' },
 931                 { "help", 0, NULL, 'h' },
 932                 { "bash", 0, NULL, 'b' },
 933                 { "dry-run", 0, NULL, 'n' },
 934                 { "page", 1, NULL, 'g' },
 935                 { "version", 0, NULL, 'v' },
 936                 { }
 937         };
 938         struct session *session;
 939         pid_t child;
 940         char *tweet;
 941         int retval = 0;
 942         int option;
 943         char *http_proxy;
 944         time_t t;
 945         int page_nr;
 946
 947         debug = 0;
 948         rl_bind_key('\t', rl_insert);
 949
 950         session = session_alloc();
 951         if (!session) {
 952                 fprintf(stderr, "no more memory...\n");
 953                 return -1;
 954         }
 955
 956         /* get the current time so that we can log it later */
 957         time(&t);
 958         session->time = strdup(ctime(&t));
 959         session->time[strlen(session->time)-1] = 0x00;
 960
 961         session->homedir = strdup(getenv("HOME"));
 962
 963         curl_global_init(CURL_GLOBAL_ALL);
 964
 965         /* Set environment variables first, before reading command line options
 966          * or config file values. */
 967         http_proxy = getenv("http_proxy");
 968         if (http_proxy) {
 969                 if (session->proxy)
 970                         free(session->proxy);
 971                 session->proxy = strdup(http_proxy);
 972                 dbg("http_proxy = %s\n", session->proxy);
 973         }
 974
 975         parse_configfile(session);
 976
 977         while (1) {
 978                 option = getopt_long_only(argc, argv, "dqe:p:P:H:a:A:u:hg:sn",
 979                                           options, NULL);
 980                 if (option == -1)
 981                         break;
 982                 switch (option) {
 983                 case 'd':
 984                         debug = 1;
 985                         break;
 986                 case 'a':
 987                         if (session->account)
 988                                 free(session->account);
 989                         session->account = strdup(optarg);
 990                         dbg("account = %s\n", session->account);
 991                         break;
 992                 case 'g':
 993                         page_nr = atoi(optarg);
 994                         dbg("page = %d\n", page_nr);
 995                         session->page = page_nr;
 996                         break;
 997                 case 'p':
 998                         if (session->password)
 999                                 free(session->password);
1000                         session->password = strdup(optarg);
1001                         dbg("password = %s\n", session->password);
1002                         break;
1003                 case 'P':
1004                         if (session->proxy)
1005                                 free(session->proxy);
1006                         session->proxy = strdup(optarg);
1007                         dbg("proxy = %s\n", session->proxy);
1008                         break;
1009                 case 'A':
1010                         if (strcasecmp(optarg, "update") == 0)
1011                                 session->action = ACTION_UPDATE;
1012                         else if (strcasecmp(optarg, "friends") == 0)
1013                                 session->action = ACTION_FRIENDS;
1014                         else if (strcasecmp(optarg, "user") == 0)
1015                                 session->action = ACTION_USER;
1016                         else if (strcasecmp(optarg, "replies") == 0)
1017                                 session->action = ACTION_REPLIES;
1018                         else if (strcasecmp(optarg, "public") == 0)
1019                                 session->action = ACTION_PUBLIC;
1020                         else
1021                                 session->action = ACTION_UNKNOWN;
1022                         dbg("action = %d\n", session->action);
1023                         break;
1024                 case 'u':
1025                         if (session->user)
1026                                 free(session->user);
1027                         session->user = strdup(optarg);
1028                         dbg("user = %s\n", session->user);
1029                         break;
1030                 case 'L':
1031                         if (session->logfile)
1032                                 free(session->logfile);
1033                         session->logfile = strdup(optarg);
1034                         dbg("logfile = %s\n", session->logfile);
1035                         break;
1036                 case 's':
1037                         session->shrink_urls = 1;
1038                         break;
1039                 case 'H':
1040                         if (strcasecmp(optarg, "twitter") == 0)
1041                                 session->host = HOST_TWITTER;
1042                         if (strcasecmp(optarg, "identica") == 0)
1043                                 session->host = HOST_IDENTICA;
1044                         dbg("host = %d\n", session->host);
1045                         break;
1046                 case 'b':
1047                         session->bash = 1;
1048                         break;
1049                 case 'h':
1050                         display_help();
1051                         goto exit;
1052                 case 'n':
1053                         session->dry_run = 1;
1054                         break;
1055                 case 'v':
1056                         display_version();
1057                         goto exit;
1058                 default:
1059                         display_help();
1060                         goto exit;
1061                 }
1062         }
1063
1064         /*
1065          * Show the version to make it easier to determine what
1066          * is going on here
1067          */
1068         if (debug)
1069                 display_version();
1070
1071         if (session->action == ACTION_UNKNOWN) {
1072                 fprintf(stderr, "Unknown action, valid actions are:\n");
1073                 fprintf(stderr, "'update', 'friends', 'public', "
1074                         "'replies' or 'user'.\n");
1075                 goto exit;
1076         }
1077
1078         if (!session->account) {
1079                 fprintf(stdout, "Enter twitter account: ");
1080                 session->account = readline(NULL);
1081         }
1082
1083         if (!session->password) {
1084                 fprintf(stdout, "Enter twitter password: ");
1085                 session->password = readline(NULL);
1086         }
1087
1088         if (session->action == ACTION_UPDATE) {
1089                 if (session->bash)
1090                         tweet = get_string_from_stdin();
1091                 else
1092                         tweet = readline("tweet: ");
1093                 if (!tweet || strlen(tweet) == 0) {
1094                         dbg("no tweet?\n");
1095                         return -1;
1096                 }
1097
1098                 if (session->shrink_urls)
1099                         tweet = shrink_urls(tweet);
1100
1101                 session->tweet = zalloc(strlen(tweet) + 10);
1102                 if (session->bash)
1103                         sprintf(session->tweet, "%c %s", getuid() ? '$' : '#', tweet);
1104                 else
1105                         sprintf(session->tweet, "%s", tweet);
1106
1107                 free(tweet);
1108                 dbg("tweet = %s\n", session->tweet);
1109         }
1110
1111         if (!session->user)
1112                 session->user = strdup(session->account);
1113
1114         if (session->page == 0)
1115                 session->page = 1;
1116         dbg("account = %s\n", session->account);
1117         dbg("password = %s\n", session->password);
1118         dbg("host = %d\n", session->host);
1119         dbg("action = %d\n", session->action);
1120
1121         /* fork ourself so that the main shell can get on
1122          * with it's life as we try to connect and handle everything
1123          */
1124         if (session->bash) {
1125                 child = fork();
1126                 if (child) {
1127                         dbg("child is %d\n", child);
1128                         exit(0);
1129                 }
1130         }
1131
1132         retval = send_request(session);
1133         if (retval && !session->bash)
1134                 fprintf(stderr, "operation failed\n");
1135
1136         log_session(session, retval);
1137 exit:
1138         session_free(session);
1139         return retval;;
1140 }