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         int bash;
  85         int shrink_urls;
  86         int dry_run;
  87         int page;
  88         enum host host;
  89         enum action action;
  90 };
  91
  92 struct bti_curl_buffer {
  93         char *data;
  94         enum action action;
  95         int length;
  96 };
  97
  98 static void display_help(void)
  99 {
 100         fprintf(stdout, "bti - send tweet to twitter or identi.ca\n");
 101         fprintf(stdout, "Version: " VERSION "\n");
 102         fprintf(stdout, "Usage:\n");
 103         fprintf(stdout, "  bti [options]\n");
 104         fprintf(stdout, "options are:\n");
 105         fprintf(stdout, "  --account accountname\n");
 106         fprintf(stdout, "  --password password\n");
 107         fprintf(stdout, "  --action action\n");
 108         fprintf(stdout, "    ('update', 'friends', 'public', 'replies', "
 109                 "'group' or 'user')\n");
 110         fprintf(stdout, "  --user screenname\n");
 111         fprintf(stdout, "  --group groupname\n");
 112         fprintf(stdout, "  --proxy PROXY:PORT\n");
 113         fprintf(stdout, "  --host HOST\n");
 114         fprintf(stdout, "  --logfile logfile\n");
 115         fprintf(stdout, "  --shrink-urls\n");
 116         fprintf(stdout, "  --page PAGENUMBER\n");
 117         fprintf(stdout, "  --bash\n");
 118         fprintf(stdout, "  --debug\n");
 119         fprintf(stdout, "  --verbose\n");
 120         fprintf(stdout, "  --dry-run\n");
 121         fprintf(stdout, "  --version\n");
 122         fprintf(stdout, "  --help\n");
 123 }
 124
 125 static void display_version(void)
 126 {
 127         fprintf(stdout, "bti - version %s\n", VERSION);
 128 }
 129
 130 static struct session *session_alloc(void)
 131 {
 132         struct session *session;
 133
 134         session = zalloc(sizeof(*session));
 135         if (!session)
 136                 return NULL;
 137         return session;
 138 }
 139
 140 static void session_free(struct session *session)
 141 {
 142         if (!session)
 143                 return;
 144         free(session->password);
 145         free(session->account);
 146         free(session->tweet);
 147         free(session->proxy);
 148         free(session->time);
 149         free(session->homedir);
 150         free(session->user);
 151         free(session->group);
 152         free(session->hosturl);
 153         free(session);
 154 }
 155
 156 static struct bti_curl_buffer *bti_curl_buffer_alloc(enum action action)
 157 {
 158         struct bti_curl_buffer *buffer;
 159
 160         buffer = zalloc(sizeof(*buffer));
 161         if (!buffer)
 162                 return NULL;
 163
 164         /* start out with a data buffer of 1 byte to
 165          * make the buffer fill logic simpler */
 166         buffer->data = zalloc(1);
 167         if (!buffer->data) {
 168                 free(buffer);
 169                 return NULL;
 170         }
 171         buffer->length = 0;
 172         buffer->action = action;
 173         return buffer;
 174 }
 175
 176 static void bti_curl_buffer_free(struct bti_curl_buffer *buffer)
 177 {
 178         if (!buffer)
 179                 return;
 180         free(buffer->data);
 181         free(buffer);
 182 }
 183
 184 static const char *twitter_host  = "https://twitter.com/statuses";
 185 static const char *identica_host = "https://identi.ca/api/statuses";
 186
 187 static const char *user_uri    = "/user_timeline/";
 188 static const char *update_uri  = "/update.xml";
 189 static const char *public_uri  = "/public_timeline.xml";
 190 static const char *friends_uri = "/friends_timeline.xml";
 191 static const char *replies_uri = "/replies.xml";
 192 static const char *group_uri = "/../laconica/groups/timeline/";
 193
 194 static CURL *curl_init(void)
 195 {
 196         CURL *curl;
 197
 198         curl = curl_easy_init();
 199         if (!curl) {
 200                 fprintf(stderr, "Can not init CURL!\n");
 201                 return NULL;
 202         }
 203         /* some ssl sanity checks on the connection we are making */
 204         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0);
 205         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0);
 206         return curl;
 207 }
 208
 209 static void parse_statuses(xmlDocPtr doc, xmlNodePtr current)
 210 {
 211         xmlChar *text = NULL;
 212         xmlChar *user = NULL;
 213         xmlChar *created = NULL;
 214         xmlNodePtr userinfo;
 215
 216         current = current->xmlChildrenNode;
 217         while (current != NULL) {
 218                 if (current->type == XML_ELEMENT_NODE) {
 219                         if (!xmlStrcmp(current->name, (const xmlChar *)"created_at"))
 220                                 created = xmlNodeListGetString(doc, current->xmlChildrenNode, 1);
 221                         if (!xmlStrcmp(current->name, (const xmlChar *)"text"))
 222                                 text = xmlNodeListGetString(doc, current->xmlChildrenNode, 1);
 223                         if (!xmlStrcmp(current->name, (const xmlChar *)"user")) {
 224                                 userinfo = current->xmlChildrenNode;
 225                                 while (userinfo != NULL) {
 226                                         if ((!xmlStrcmp(userinfo->name, (const xmlChar *)"screen_name"))) {
 227                                                 if (user)
 228                                                         xmlFree(user);
 229                                                 user = xmlNodeListGetString(doc, userinfo->xmlChildrenNode, 1);
 230                                         }
 231                                         userinfo = userinfo->next;
 232                                 }
 233                         }
 234
 235                         if (user && text && created) {
 236                                 if (verbose)
 237                                         printf("[%s] (%.16s) %s\n",
 238                                                 user, created, text);
 239                                 else
 240                                         printf("[%s] %s\n",
 241                                                 user, text);
 242                                 xmlFree(user);
 243                                 xmlFree(text);
 244                                 xmlFree(created);
 245                                 user = NULL;
 246                                 text = NULL;
 247                                 created = NULL;
 248                         }
 249                 }
 250                 current = current->next;
 251         }
 252
 253         return;
 254 }
 255
 256 static void parse_timeline(char *document)
 257 {
 258         xmlDocPtr doc;
 259         xmlNodePtr current;
 260
 261         doc = xmlReadMemory(document, strlen(document), "timeline.xml",
 262                             NULL, XML_PARSE_NOERROR);
 263         if (doc == NULL)
 264                 return;
 265
 266         current = xmlDocGetRootElement(doc);
 267         if (current == NULL) {
 268                 fprintf(stderr, "empty document\n");
 269                 xmlFreeDoc(doc);
 270                 return;
 271         }
 272
 273         if (xmlStrcmp(current->name, (const xmlChar *) "statuses")) {
 274                 fprintf(stderr, "unexpected document type\n");
 275                 xmlFreeDoc(doc);
 276                 return;
 277         }
 278
 279         current = current->xmlChildrenNode;
 280         while (current != NULL) {
 281                 if ((!xmlStrcmp(current->name, (const xmlChar *)"status")))
 282                         parse_statuses(doc, current);
 283                 current = current->next;
 284         }
 285         xmlFreeDoc(doc);
 286
 287         return;
 288 }
 289
 290 static size_t curl_callback(void *buffer, size_t size, size_t nmemb,
 291                             void *userp)
 292 {
 293         struct bti_curl_buffer *curl_buf = userp;
 294         size_t buffer_size = size * nmemb;
 295         char *temp;
 296
 297         if ((!buffer) || (!buffer_size) || (!curl_buf))
 298                 return -EINVAL;
 299
 300         /* add to the data we already have */
 301         temp = zalloc(curl_buf->length + buffer_size + 1);
 302         if (!temp)
 303                 return -ENOMEM;
 304
 305         memcpy(temp, curl_buf->data, curl_buf->length);
 306         free(curl_buf->data);
 307         curl_buf->data = temp;
 308         memcpy(&curl_buf->data[curl_buf->length], (char *)buffer, buffer_size);
 309         curl_buf->length += buffer_size;
 310         if (curl_buf->action)
 311                 parse_timeline(curl_buf->data);
 312
 313         dbg("%s\n", curl_buf->data);
 314
 315         return buffer_size;
 316 }
 317
 318 static int send_request(struct session *session)
 319 {
 320         char endpoint[100];
 321         char user_password[500];
 322         char data[500];
 323         struct bti_curl_buffer *curl_buf;
 324         CURL *curl = NULL;
 325         CURLcode res;
 326         struct curl_httppost *formpost = NULL;
 327         struct curl_httppost *lastptr = NULL;
 328         struct curl_slist *slist = NULL;
 329
 330         if (!session)
 331                 return -EINVAL;
 332
 333         curl_buf = bti_curl_buffer_alloc(session->action);
 334         if (!curl_buf)
 335                 return -ENOMEM;
 336
 337         curl = curl_init();
 338         if (!curl)
 339                 return -EINVAL;
 340
 341         switch (session->action) {
 342         case ACTION_UPDATE:
 343                 snprintf(user_password, sizeof(user_password), "%s:%s",
 344                          session->account, session->password);
 345                 snprintf(data, sizeof(data), "status=\"%s\"", session->tweet);
 346                 curl_formadd(&formpost, &lastptr,
 347                              CURLFORM_COPYNAME, "status",
 348                              CURLFORM_COPYCONTENTS, session->tweet,
 349                              CURLFORM_END);
 350
 351                 curl_formadd(&formpost, &lastptr,
 352                              CURLFORM_COPYNAME, "source",
 353                              CURLFORM_COPYCONTENTS, "bti",
 354                              CURLFORM_END);
 355
 356                 curl_easy_setopt(curl, CURLOPT_HTTPPOST, formpost);
 357                 slist = curl_slist_append(slist, "Expect:");
 358                 curl_easy_setopt(curl, CURLOPT_HTTPHEADER, slist);
 359
 360                 sprintf(endpoint, "%s%s", session->hosturl, update_uri);
 361                 curl_easy_setopt(curl, CURLOPT_URL, endpoint);
 362                 curl_easy_setopt(curl, CURLOPT_USERPWD, user_password);
 363
 364                 break;
 365         case ACTION_FRIENDS:
 366                 snprintf(user_password, sizeof(user_password), "%s:%s",
 367                          session->account, session->password);
 368                 sprintf(endpoint, "%s%s?page=%d", session->hosturl,
 369                         friends_uri, session->page);
 370                 curl_easy_setopt(curl, CURLOPT_URL, endpoint);
 371                 curl_easy_setopt(curl, CURLOPT_USERPWD, user_password);
 372
 373                 break;
 374         case ACTION_USER:
 375                 sprintf(endpoint, "%s%s%s.xml?page=%d", session->hosturl,
 376                         user_uri, session->user, session->page);
 377                 curl_easy_setopt(curl, CURLOPT_URL, endpoint);
 378
 379                 break;
 380         case ACTION_REPLIES:
 381                 snprintf(user_password, sizeof(user_password), "%s:%s",
 382                          session->account, session->password);
 383                 sprintf(endpoint, "%s%s?page=%d", session->hosturl, replies_uri,
 384                         session->page);
 385                 curl_easy_setopt(curl, CURLOPT_URL, endpoint);
 386                 curl_easy_setopt(curl, CURLOPT_USERPWD, user_password);
 387
 388                 break;
 389         case ACTION_PUBLIC:
 390                 sprintf(endpoint, "%s%s?page=%d", session->hosturl, public_uri,
 391                         session->page);
 392                 curl_easy_setopt(curl, CURLOPT_URL, endpoint);
 393
 394                 break;
 395         case ACTION_GROUP:
 396                 sprintf(endpoint, "%s%s%s.xml?page=%d", session->hosturl,
 397                                 group_uri, session->group, session->page);
 398                 curl_easy_setopt(curl, CURLOPT_URL, endpoint);
 399
 400                 break;
 401         default:
 402                 break;
 403         }
 404
 405         if (session->proxy)
 406                 curl_easy_setopt(curl, CURLOPT_PROXY, session->proxy);
 407
 408         if (debug)
 409                 curl_easy_setopt(curl, CURLOPT_VERBOSE, 1);
 410
 411         dbg("user_password = %s\n", user_password);
 412         dbg("data = %s\n", data);
 413         dbg("proxy = %s\n", session->proxy);
 414
 415         curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, curl_callback);
 416         curl_easy_setopt(curl, CURLOPT_WRITEDATA, curl_buf);
 417         if (!session->dry_run) {
 418                 res = curl_easy_perform(curl);
 419                 if (res && !session->bash) {
 420                         fprintf(stderr, "error(%d) trying to perform "
 421                                 "operation\n", res);
 422                         return -EINVAL;
 423                 }
 424         }
 425
 426         curl_easy_cleanup(curl);
 427         if (session->action == ACTION_UPDATE)
 428                 curl_formfree(formpost);
 429         bti_curl_buffer_free(curl_buf);
 430         return 0;
 431 }
 432
 433 static void parse_configfile(struct session *session)
 434 {
 435         FILE *config_file;
 436         char *line = NULL;
 437         size_t len = 0;
 438         char *account = NULL;
 439         char *password = NULL;
 440         char *host = NULL;
 441         char *proxy = NULL;
 442         char *logfile = NULL;
 443         char *action = NULL;
 444         char *user = NULL;
 445         char *file;
 446         int shrink_urls = 0;
 447
 448         /* config file is ~/.bti  */
 449         file = alloca(strlen(session->homedir) + 7);
 450
 451         sprintf(file, "%s/.bti", session->homedir);
 452
 453         config_file = fopen(file, "r");
 454
 455         /* No error if file does not exist or is unreadable.  */
 456         if (config_file == NULL)
 457                 return;
 458
 459         do {
 460                 ssize_t n = getline(&line, &len, config_file);
 461                 if (n < 0)
 462                         break;
 463                 if (line[n - 1] == '\n')
 464                         line[n - 1] = '\0';
 465                 /* Parse file.  Format is the usual value pairs:
 466                    account=name
 467                    passwort=value
 468                    # is a comment character
 469                 */
 470                 *strchrnul(line, '#') = '\0';
 471                 char *c = line;
 472                 while (isspace(*c))
 473                         c++;
 474                 /* Ignore blank lines.  */
 475                 if (c[0] == '\0')
 476                         continue;
 477
 478                 if (!strncasecmp(c, "account", 7) && (c[7] == '=')) {
 479                         c += 8;
 480                         if (c[0] != '\0')
 481                                 account = strdup(c);
 482                 } else if (!strncasecmp(c, "password", 8) &&
 483                            (c[8] == '=')) {
 484                         c += 9;
 485                         if (c[0] != '\0')
 486                                 password = strdup(c);
 487                 } else if (!strncasecmp(c, "host", 4) &&
 488                            (c[4] == '=')) {
 489                         c += 5;
 490                         if (c[0] != '\0')
 491                                 host = strdup(c);
 492                 } else if (!strncasecmp(c, "proxy", 5) &&
 493                            (c[5] == '=')) {
 494                         c += 6;
 495                         if (c[0] != '\0')
 496                                 proxy = strdup(c);
 497                 } else if (!strncasecmp(c, "logfile", 7) &&
 498                            (c[7] == '=')) {
 499                         c += 8;
 500                         if (c[0] != '\0')
 501                                 logfile = strdup(c);
 502                 } else if (!strncasecmp(c, "action", 6) &&
 503                            (c[6] == '=')) {
 504                         c += 7;
 505                         if (c[0] != '\0')
 506                                 action = strdup(c);
 507                 } else if (!strncasecmp(c, "user", 4) &&
 508                                 (c[4] == '=')) {
 509                         c += 5;
 510                         if (c[0] != '\0')
 511                                 user = strdup(c);
 512                 } else if (!strncasecmp(c, "shrink-urls", 11) &&
 513                                 (c[11] == '=')) {
 514                         c += 12;
 515                         if (!strncasecmp(c, "true", 4) ||
 516                                         !strncasecmp(c, "yes", 3))
 517                                 shrink_urls = 1;
 518                 } else if (!strncasecmp(c, "verbose", 7) &&
 519                                 (c[7] == '=')) {
 520                         c += 8;
 521                         if (!strncasecmp(c, "true", 4) ||
 522                                         !strncasecmp(c, "yes", 3))
 523                                 verbose = 1;
 524                 }
 525         } while (!feof(config_file));
 526
 527         if (password)
 528                 session->password = password;
 529         if (account)
 530                 session->account = account;
 531         if (host) {
 532                 if (strcasecmp(host, "twitter") == 0) {
 533                         session->host = HOST_TWITTER;
 534                         session->hosturl = strdup(twitter_host);
 535                 } else if (strcasecmp(host, "identica") == 0) {
 536                         session->host = HOST_IDENTICA;
 537                         session->hosturl = strdup(identica_host);
 538                 } else {
 539                         session->host = HOST_CUSTOM;
 540                         session->hosturl = strdup(host);
 541                 }
 542                 free(host);
 543         }
 544         if (proxy) {
 545                 if (session->proxy)
 546                         free(session->proxy);
 547                 session->proxy = proxy;
 548         }
 549         if (logfile)
 550                 session->logfile = logfile;
 551         if (action) {
 552                 if (strcasecmp(action, "update") == 0)
 553                         session->action = ACTION_UPDATE;
 554                 else if (strcasecmp(action, "friends") == 0)
 555                         session->action = ACTION_FRIENDS;
 556                 else if (strcasecmp(action, "user") == 0)
 557                         session->action = ACTION_USER;
 558                 else if (strcasecmp(action, "replies") == 0)
 559                         session->action = ACTION_REPLIES;
 560                 else if (strcasecmp(action, "public") == 0)
 561                         session->action = ACTION_PUBLIC;
 562                 else if (strcasecmp(action, "group") == 0)
 563                         session->action = ACTION_GROUP;
 564                 else
 565                         session->action = ACTION_UNKNOWN;
 566                 free(action);
 567         }
 568         if (user)
 569                 session->user = user;
 570         session->shrink_urls = shrink_urls;
 571
 572         /* Free buffer and close file.  */
 573         free(line);
 574         fclose(config_file);
 575 }
 576
 577 static void log_session(struct session *session, int retval)
 578 {
 579         FILE *log_file;
 580         char *filename;
 581         char *host;
 582
 583         /* Only log something if we have a log file set */
 584         if (!session->logfile)
 585                 return;
 586
 587         filename = alloca(strlen(session->homedir) +
 588                           strlen(session->logfile) + 3);
 589
 590         sprintf(filename, "%s/%s", session->homedir, session->logfile);
 591
 592         log_file = fopen(filename, "a+");
 593         if (log_file == NULL)
 594                 return;
 595         switch (session->host) {
 596         case HOST_TWITTER:
 597                 host = "twitter";
 598                 break;
 599         case HOST_IDENTICA:
 600                 host = "identi.ca";
 601                 break;
 602         default:
 603                 host = session->hosturl;
 604                 break;
 605         }
 606
 607         switch (session->action) {
 608         case ACTION_UPDATE:
 609                 if (retval)
 610                         fprintf(log_file, "%s: host=%s tweet failed\n",
 611                                 session->time, host);
 612                 else
 613                         fprintf(log_file, "%s: host=%s tweet=%s\n",
 614                                 session->time, host, session->tweet);
 615                 break;
 616         case ACTION_FRIENDS:
 617                 fprintf(log_file, "%s: host=%s retrieving friends timeline\n",
 618                         session->time, host);
 619                 break;
 620         case ACTION_USER:
 621                 fprintf(log_file, "%s: host=%s retrieving %s's timeline\n",
 622                         session->time, host, session->user);
 623                 break;
 624         case ACTION_REPLIES:
 625                 fprintf(log_file, "%s: host=%s retrieving replies\n",
 626                         session->time, host);
 627                 break;
 628         case ACTION_PUBLIC:
 629                 fprintf(log_file, "%s: host=%s retrieving public timeline\n",
 630                         session->time, host);
 631                 break;
 632         case ACTION_GROUP:
 633                 fprintf(log_file, "%s: host=%s retrieving group timeline\n",
 634                         session->time, host);
 635                 break;
 636         default:
 637                 break;
 638         }
 639
 640         fclose(log_file);
 641 }
 642
 643 static char *get_string_from_stdin(void)
 644 {
 645         char *temp;
 646         char *string;
 647
 648         string = zalloc(1000);
 649         if (!string)
 650                 return NULL;
 651
 652         if (!fgets(string, 999, stdin))
 653                 return NULL;
 654         temp = strchr(string, '\n');
 655         *temp = '\0';
 656         return string;
 657 }
 658
 659 void read_password(char *buf, size_t len)
 660 {
 661         char pwd[80];
 662         struct termios old;
 663         struct termios tp;
 664
 665         tcgetattr(0, &tp);
 666         old = tp;
 667
 668         tp.c_lflag &= (~ECHO);
 669         tcsetattr(0, TCSANOW, &tp);
 670
 671         fprintf(stdout, "Enter twitter password: ");
 672         fflush(stdout);
 673         scanf("%79s", pwd);
 674         fprintf(stdout, "\n");
 675
 676         tcsetattr(0, TCSANOW, &old);
 677
 678         strncpy(buf, pwd, len);
 679         buf[len-1] = '\0';
 680 }
 681
 682 static int find_urls(const char *tweet, int **pranges)
 683 {
 684         /*
 685          * magic obtained from
 686          * http://www.geekpedia.com/KB65_How-to-validate-an-URL-using-RegEx-in-Csharp.html
 687          */
 688         static const char *re_magic =
 689                 "(([a-zA-Z][0-9a-zA-Z+\\-\\.]*:)/{1,3}"
 690                 "[0-9a-zA-Z;/~?:@&=+$\\.\\-_'()%]+)"
 691                 "(#[0-9a-zA-Z;/?:@&=+$\\.\\-_!~*'()%]+)?";
 692         pcre *re;
 693         const char *errptr;
 694         int erroffset;
 695         int ovector[10] = {0,};
 696         const size_t ovsize = sizeof(ovector)/sizeof(*ovector);
 697         int startoffset, tweetlen;
 698         int i, rc;
 699         int rbound = 10;
 700         int rcount = 0;
 701         int *ranges = malloc(sizeof(int) * rbound);
 702
 703         re = pcre_compile(re_magic,
 704                         PCRE_NO_AUTO_CAPTURE,
 705                         &errptr, &erroffset, NULL);
 706         if (!re) {
 707                 fprintf(stderr, "pcre_compile @%u: %s\n", erroffset, errptr);
 708                 exit(1);
 709         }
 710
 711         tweetlen = strlen(tweet);
 712         for (startoffset = 0; startoffset < tweetlen; ) {
 713
 714                 rc = pcre_exec(re, NULL, tweet, strlen(tweet), startoffset, 0,
 715                                 ovector, ovsize);
 716                 if (rc == PCRE_ERROR_NOMATCH)
 717                         break;
 718
 719                 if (rc < 0) {
 720                         fprintf(stderr, "pcre_exec @%u: %s\n",
 721                                 erroffset, errptr);
 722                         exit(1);
 723                 }
 724
 725                 for (i = 0; i < rc; i += 2) {
 726                         if ((rcount+2) == rbound) {
 727                                 rbound *= 2;
 728                                 ranges = realloc(ranges, sizeof(int) * rbound);
 729                         }
 730
 731                         ranges[rcount++] = ovector[i];
 732                         ranges[rcount++] = ovector[i+1];
 733                 }
 734
 735                 startoffset = ovector[1];
 736         }
 737
 738         pcre_free(re);
 739
 740         *pranges = ranges;
 741         return rcount;
 742 }
 743
 744 /**
 745  * bidirectional popen() call
 746  *
 747  * @param rwepipe - int array of size three
 748  * @param exe - program to run
 749  * @param argv - argument list
 750  * @return pid or -1 on error
 751  *
 752  * The caller passes in an array of three integers (rwepipe), on successful
 753  * execution it can then write to element 0 (stdin of exe), and read from
 754  * element 1 (stdout) and 2 (stderr).
 755  */
 756 static int popenRWE(int *rwepipe, const char *exe, const char *const argv[])
 757 {
 758         int in[2];
 759         int out[2];
 760         int err[2];
 761         int pid;
 762         int rc;
 763
 764         rc = pipe(in);
 765         if (rc < 0)
 766                 goto error_in;
 767
 768         rc = pipe(out);
 769         if (rc < 0)
 770                 goto error_out;
 771
 772         rc = pipe(err);
 773         if (rc < 0)
 774                 goto error_err;
 775
 776         pid = fork();
 777         if (pid > 0) {
 778                 /* parent */
 779                 close(in[0]);
 780                 close(out[1]);
 781                 close(err[1]);
 782                 rwepipe[0] = in[1];
 783                 rwepipe[1] = out[0];
 784                 rwepipe[2] = err[0];
 785                 return pid;
 786         } else if (pid == 0) {
 787                 /* child */
 788                 close(in[1]);
 789                 close(out[0]);
 790                 close(err[0]);
 791                 close(0);
 792                 rc = dup(in[0]);
 793                 close(1);
 794                 rc = dup(out[1]);
 795                 close(2);
 796                 rc = dup(err[1]);
 797
 798                 execvp(exe, (char **)argv);
 799                 exit(1);
 800         } else
 801                 goto error_fork;
 802
 803         return pid;
 804
 805 error_fork:
 806         close(err[0]);
 807         close(err[1]);
 808 error_err:
 809         close(out[0]);
 810         close(out[1]);
 811 error_out:
 812         close(in[0]);
 813         close(in[1]);
 814 error_in:
 815         return -1;
 816 }
 817
 818 static int pcloseRWE(int pid, int *rwepipe)
 819 {
 820         int rc, status;
 821         close(rwepipe[0]);
 822         close(rwepipe[1]);
 823         close(rwepipe[2]);
 824         rc = waitpid(pid, &status, 0);
 825         return status;
 826 }
 827
 828 static char *shrink_one_url(int *rwepipe, char *big)
 829 {
 830         int biglen = strlen(big);
 831         char *small;
 832         int smalllen;
 833         int rc;
 834
 835         rc = dprintf(rwepipe[0], "%s\n", big);
 836         if (rc < 0)
 837                 return big;
 838
 839         smalllen = biglen + 128;
 840         small = malloc(smalllen);
 841         if (!small)
 842                 return big;
 843
 844         rc = read(rwepipe[1], small, smalllen);
 845         if (rc < 0 || rc > biglen)
 846                 goto error_free_small;
 847
 848         if (strncmp(small, "http://", 7))
 849                 goto error_free_small;
 850
 851         smalllen = rc;
 852         while (smalllen && isspace(small[smalllen-1]))
 853                         small[--smalllen] = 0;
 854
 855         free(big);
 856         return small;
 857
 858 error_free_small:
 859         free(small);
 860         return big;
 861 }
 862
 863 static char *shrink_urls(char *text)
 864 {
 865         int *ranges;
 866         int rcount;
 867         int i;
 868         int inofs = 0;
 869         int outofs = 0;
 870         const char *const shrink_args[] = {
 871                 "bti-shrink-urls",
 872                 NULL
 873         };
 874         int shrink_pid;
 875         int shrink_pipe[3];
 876         int inlen = strlen(text);
 877
 878         dbg("before len=%u\n", inlen);
 879
 880         shrink_pid = popenRWE(shrink_pipe, shrink_args[0], shrink_args);
 881         if (shrink_pid < 0)
 882                 return text;
 883
 884         rcount = find_urls(text, &ranges);
 885         if (!rcount)
 886                 return text;
 887
 888         for (i = 0; i < rcount; i += 2) {
 889                 int url_start = ranges[i];
 890                 int url_end = ranges[i+1];
 891                 int long_url_len = url_end - url_start;
 892                 char *url = strndup(text + url_start, long_url_len);
 893                 int short_url_len;
 894                 int not_url_len = url_start - inofs;
 895
 896                 dbg("long  url[%u]: %s\n", long_url_len, url);
 897                 url = shrink_one_url(shrink_pipe, url);
 898                 short_url_len = url ? strlen(url) : 0;
 899                 dbg("short url[%u]: %s\n", short_url_len, url);
 900
 901                 if (!url || short_url_len >= long_url_len) {
 902                         /* The short url ended up being too long
 903                          * or unavailable */
 904                         if (inofs) {
 905                                 strncpy(text + outofs, text + inofs,
 906                                                 not_url_len + long_url_len);
 907                         }
 908                         inofs += not_url_len + long_url_len;
 909                         outofs += not_url_len + long_url_len;
 910
 911                 } else {
 912                         /* copy the unmodified block */
 913                         strncpy(text + outofs, text + inofs, not_url_len);
 914                         inofs += not_url_len;
 915                         outofs += not_url_len;
 916
 917                         /* copy the new url */
 918                         strncpy(text + outofs, url, short_url_len);
 919                         inofs += long_url_len;
 920                         outofs += short_url_len;
 921                 }
 922
 923                 free(url);
 924         }
 925
 926         /* copy the last block after the last match */
 927         if (inofs) {
 928                 int tail = inlen - inofs;
 929                 if (tail) {
 930                         strncpy(text + outofs, text + inofs, tail);
 931                         outofs += tail;
 932                 }
 933         }
 934
 935         free(ranges);
 936
 937         (void)pcloseRWE(shrink_pid, shrink_pipe);
 938
 939         text[outofs] = 0;
 940         dbg("after len=%u\n", outofs);
 941         return text;
 942 }
 943
 944 int main(int argc, char *argv[], char *envp[])
 945 {
 946         static const struct option options[] = {
 947                 { "debug", 0, NULL, 'd' },
 948                 { "verbose", 0, NULL, 'V' },
 949                 { "account", 1, NULL, 'a' },
 950                 { "password", 1, NULL, 'p' },
 951                 { "host", 1, NULL, 'H' },
 952                 { "proxy", 1, NULL, 'P' },
 953                 { "action", 1, NULL, 'A' },
 954                 { "user", 1, NULL, 'u' },
 955                 { "group", 1, NULL, 'G' },
 956                 { "logfile", 1, NULL, 'L' },
 957                 { "shrink-urls", 0, NULL, 's' },
 958                 { "help", 0, NULL, 'h' },
 959                 { "bash", 0, NULL, 'b' },
 960                 { "dry-run", 0, NULL, 'n' },
 961                 { "page", 1, NULL, 'g' },
 962                 { "version", 0, NULL, 'v' },
 963                 { }
 964         };
 965         struct session *session;
 966         pid_t child;
 967         char *tweet;
 968         static char password[80];
 969         int retval = 0;
 970         int option;
 971         char *http_proxy;
 972         time_t t;
 973         int page_nr;
 974
 975         debug = 0;
 976         verbose = 0;
 977         rl_bind_key('\t', rl_insert);
 978
 979         session = session_alloc();
 980         if (!session) {
 981                 fprintf(stderr, "no more memory...\n");
 982                 return -1;
 983         }
 984
 985         /* get the current time so that we can log it later */
 986         time(&t);
 987         session->time = strdup(ctime(&t));
 988         session->time[strlen(session->time)-1] = 0x00;
 989
 990         session->homedir = strdup(getenv("HOME"));
 991
 992         curl_global_init(CURL_GLOBAL_ALL);
 993
 994         /* Set environment variables first, before reading command line options
 995          * or config file values. */
 996         http_proxy = getenv("http_proxy");
 997         if (http_proxy) {
 998                 if (session->proxy)
 999                         free(session->proxy);
1000                 session->proxy = strdup(http_proxy);
1001                 dbg("http_proxy = %s\n", session->proxy);
1002         }
1003
1004         parse_configfile(session);
1005
1006         while (1) {
1007                 option = getopt_long_only(argc, argv, "dp:P:H:a:A:u:hg:G:snVv",
1008                                           options, NULL);
1009                 if (option == -1)
1010                         break;
1011                 switch (option) {
1012                 case 'd':
1013                         debug = 1;
1014                         break;
1015                 case 'V':
1016                         verbose = 1;
1017                         break;
1018                 case 'a':
1019                         if (session->account)
1020                                 free(session->account);
1021                         session->account = strdup(optarg);
1022                         dbg("account = %s\n", session->account);
1023                         break;
1024                 case 'g':
1025                         page_nr = atoi(optarg);
1026                         dbg("page = %d\n", page_nr);
1027                         session->page = page_nr;
1028                         break;
1029                 case 'p':
1030                         if (session->password)
1031                                 free(session->password);
1032                         session->password = strdup(optarg);
1033                         dbg("password = %s\n", session->password);
1034                         break;
1035                 case 'P':
1036                         if (session->proxy)
1037                                 free(session->proxy);
1038                         session->proxy = strdup(optarg);
1039                         dbg("proxy = %s\n", session->proxy);
1040                         break;
1041                 case 'A':
1042                         if (strcasecmp(optarg, "update") == 0)
1043                                 session->action = ACTION_UPDATE;
1044                         else if (strcasecmp(optarg, "friends") == 0)
1045                                 session->action = ACTION_FRIENDS;
1046                         else if (strcasecmp(optarg, "user") == 0)
1047                                 session->action = ACTION_USER;
1048                         else if (strcasecmp(optarg, "replies") == 0)
1049                                 session->action = ACTION_REPLIES;
1050                         else if (strcasecmp(optarg, "public") == 0)
1051                                 session->action = ACTION_PUBLIC;
1052                         else if (strcasecmp(optarg, "group") == 0)
1053                                 session->action = ACTION_GROUP;
1054                         else
1055                                 session->action = ACTION_UNKNOWN;
1056                         dbg("action = %d\n", session->action);
1057                         break;
1058                 case 'u':
1059                         if (session->user)
1060                                 free(session->user);
1061                         session->user = strdup(optarg);
1062                         dbg("user = %s\n", session->user);
1063                         break;
1064
1065                 case 'G':
1066                         if (session->group)
1067                                 free(session->group);
1068                         session->group = strdup(optarg);
1069                         dbg("group = %s\n", session->group);
1070                         break;
1071                 case 'L':
1072                         if (session->logfile)
1073                                 free(session->logfile);
1074                         session->logfile = strdup(optarg);
1075                         dbg("logfile = %s\n", session->logfile);
1076                         break;
1077                 case 's':
1078                         session->shrink_urls = 1;
1079                         break;
1080                 case 'H':
1081                         if (session->hosturl)
1082                                 free(session->hosturl);
1083                         if (strcasecmp(optarg, "twitter") == 0) {
1084                                 session->host = HOST_TWITTER;
1085                                 session->hosturl = strdup(twitter_host);
1086                         } else if (strcasecmp(optarg, "identica") == 0) {
1087                                 session->host = HOST_IDENTICA;
1088                                 session->hosturl = strdup(identica_host);
1089                         } else {
1090                                 session->host = HOST_CUSTOM;
1091                                 session->hosturl = strdup(optarg);
1092                         }
1093                         dbg("host = %d\n", session->host);
1094                         break;
1095                 case 'b':
1096                         session->bash = 1;
1097                         break;
1098                 case 'h':
1099                         display_help();
1100                         goto exit;
1101                 case 'n':
1102                         session->dry_run = 1;
1103                         break;
1104                 case 'v':
1105                         display_version();
1106                         goto exit;
1107                 default:
1108                         display_help();
1109                         goto exit;
1110                 }
1111         }
1112
1113         /*
1114          * Show the version to make it easier to determine what
1115          * is going on here
1116          */
1117         if (debug)
1118                 display_version();
1119
1120         if (session->action == ACTION_UNKNOWN) {
1121                 fprintf(stderr, "Unknown action, valid actions are:\n");
1122                 fprintf(stderr, "'update', 'friends', 'public', "
1123                         "'replies', 'group' or 'user'.\n");
1124                 goto exit;
1125         }
1126
1127         if (session->host == HOST_TWITTER && session->action == ACTION_GROUP) {
1128                 fprintf(stderr, "Groups only work in Identi.ca.\n");
1129                 goto exit;
1130         }
1131
1132         if (session->action == ACTION_GROUP && !session->group) {
1133                 fprintf(stdout, "Enter group name: ");
1134                 session->group = readline(NULL);
1135         }
1136
1137         if (!session->account) {
1138                 fprintf(stdout, "Enter twitter account: ");
1139                 session->account = readline(NULL);
1140         }
1141
1142         if (!session->password) {
1143                 read_password(password, sizeof(password));
1144                 session->password = strdup(password);
1145         }
1146
1147         if (session->action == ACTION_UPDATE) {
1148                 if (session->bash)
1149                         tweet = get_string_from_stdin();
1150                 else
1151                         tweet = readline("tweet: ");
1152                 if (!tweet || strlen(tweet) == 0) {
1153                         dbg("no tweet?\n");
1154                         return -1;
1155                 }
1156
1157                 if (session->shrink_urls)
1158                         tweet = shrink_urls(tweet);
1159
1160                 session->tweet = zalloc(strlen(tweet) + 10);
1161                 if (session->bash)
1162                         sprintf(session->tweet, "%c %s",
1163                                 getuid() ? '$' : '#', tweet);
1164                 else
1165                         sprintf(session->tweet, "%s", tweet);
1166
1167                 free(tweet);
1168                 dbg("tweet = %s\n", session->tweet);
1169         }
1170
1171         if (!session->user)
1172                 session->user = strdup(session->account);
1173
1174         if (session->page == 0)
1175                 session->page = 1;
1176         dbg("account = %s\n", session->account);
1177         dbg("password = %s\n", session->password);
1178         dbg("host = %d\n", session->host);
1179         dbg("action = %d\n", session->action);
1180
1181         /* fork ourself so that the main shell can get on
1182          * with it's life as we try to connect and handle everything
1183          */
1184         if (session->bash) {
1185                 child = fork();
1186                 if (child) {
1187                         dbg("child is %d\n", child);
1188                         exit(0);
1189                 }
1190         }
1191
1192         retval = send_request(session);
1193         if (retval && !session->bash)
1194                 fprintf(stderr, "operation failed\n");
1195
1196         log_session(session, retval);
1197 exit:
1198         session_free(session);
1199         return retval;;
1200 }