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