bti.c

   1 /*
   2  * Copyright (C) 2008 Greg Kroah-Hartman <greg@kroah.com>
   3  * Copyright (C) 2009 Bart Trojanowski <bart@jukie.net>
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License as published by the
   7  * Free Software Foundation version 2 of the License.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along
  15  * with this program; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  17  */
  18
  19 #define _GNU_SOURCE
  20
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23 #include <stddef.h>
  24 #include <string.h>
  25 #include <getopt.h>
  26 #include <errno.h>
  27 #include <ctype.h>
  28 #include <fcntl.h>
  29 #include <unistd.h>
  30 #include <time.h>
  31 #include <sys/stat.h>
  32 #include <sys/types.h>
  33 #include <sys/wait.h>
  34 #include <curl/curl.h>
  35 #include <readline/readline.h>
  36 #include <libxml/xmlmemory.h>
  37 #include <libxml/parser.h>
  38 #include <libxml/tree.h>
  39 #include <pcre.h>
  40
  41
  42 #define zalloc(size)    calloc(size, 1)
  43
  44 #define dbg(format, arg...)                                             \
  45         do {                                                            \
  46                 if (debug)                                              \
  47                         fprintf(stdout, "bti: %s: " format , __func__ , \
  48                                 ## arg);                                \
  49         } while (0)
  50
  51
  52 static int debug;
  53
  54 enum host {
  55         HOST_TWITTER = 0,
  56         HOST_IDENTICA = 1,
  57 };
  58
  59 enum action {
  60         ACTION_UPDATE = 0,
  61         ACTION_FRIENDS = 1,
  62         ACTION_USER = 2,
  63         ACTION_REPLIES = 4,
  64         ACTION_PUBLIC = 8,
  65         ACTION_UNKNOWN = 16
  66 };
  67
  68 struct session {
  69         char *password;
  70         char *account;
  71         char *tweet;
  72         char *proxy;
  73         char *time;
  74         char *homedir;
  75         char *logfile;
  76         char *user;
  77         int bash;
  78         int shrink_urls;
  79         int dry_run;
  80         int page;
  81         enum host host;
  82         enum action action;
  83 };
  84
  85 struct bti_curl_buffer {
  86         char *data;
  87         enum action action;
  88         int length;
  89 };
  90
  91 static void display_help(void)
  92 {
  93         fprintf(stdout, "bti - send tweet to twitter or identi.ca\n");
  94         fprintf(stdout, "Version: " VERSION "\n");
  95         fprintf(stdout, "Usage:\n");
  96         fprintf(stdout, "  bti [options]\n");
  97         fprintf(stdout, "options are:\n");
  98         fprintf(stdout, "  --account accountname\n");
  99         fprintf(stdout, "  --password password\n");
 100         fprintf(stdout, "  --action action\n");
 101         fprintf(stdout, "    ('update', 'friends', 'public', 'replies' "
 102                 "or 'user')\n");
 103         fprintf(stdout, "  --user screenname\n");
 104         fprintf(stdout, "  --proxy PROXY:PORT\n");
 105         fprintf(stdout, "  --host HOST\n");
 106         fprintf(stdout, "  --logfile logfile\n");
 107         fprintf(stdout, "  --shrink-urls\n");
 108         fprintf(stdout, "  --page PAGENUMBER\n");
 109         fprintf(stdout, "  --bash\n");
 110         fprintf(stdout, "  --debug\n");
 111         fprintf(stdout, "  --dry-run\n");
 112         fprintf(stdout, "  --version\n");
 113         fprintf(stdout, "  --help\n");
 114 }
 115
 116 static void display_version(void)
 117 {
 118         fprintf(stdout, "bti - version %s\n", VERSION);
 119 }
 120
 121 static struct session *session_alloc(void)
 122 {
 123         struct session *session;
 124
 125         session = zalloc(sizeof(*session));
 126         if (!session)
 127                 return NULL;
 128         return session;
 129 }
 130
 131 static void session_free(struct session *session)
 132 {
 133         if (!session)
 134                 return;
 135         free(session->password);
 136         free(session->account);
 137         free(session->tweet);
 138         free(session->proxy);
 139         free(session->time);
 140         free(session->homedir);
 141         free(session->user);
 142         free(session);
 143 }
 144
 145 static struct bti_curl_buffer *bti_curl_buffer_alloc(enum action action)
 146 {
 147         struct bti_curl_buffer *buffer;
 148
 149         buffer = zalloc(sizeof(*buffer));
 150         if (!buffer)
 151                 return NULL;
 152
 153         /* start out with a data buffer of 1 byte to
 154          * make the buffer fill logic simpler */
 155         buffer->data = zalloc(1);
 156         if (!buffer->data) {
 157                 free(buffer);
 158                 return NULL;
 159         }
 160         buffer->length = 0;
 161         buffer->action = action;
 162         return buffer;
 163 }
 164
 165 static void bti_curl_buffer_free(struct bti_curl_buffer *buffer)
 166 {
 167         if (!buffer)
 168                 return;
 169         free(buffer->data);
 170         free(buffer);
 171 }
 172
 173 static const char *twitter_user_url    = "http://twitter.com/statuses/user_timeline/";
 174 static const char *twitter_update_url  = "https://twitter.com/statuses/update.xml";
 175 static const char *twitter_public_url  = "http://twitter.com/statuses/public_timeline.xml";
 176 static const char *twitter_friends_url = "https://twitter.com/statuses/friends_timeline.xml";
 177 static const char *twitter_replies_url = "http://twitter.com/statuses/replies.xml";
 178
 179 static const char *identica_user_url    = "http://identi.ca/api/statuses/user_timeline/";
 180 static const char *identica_update_url  = "http://identi.ca/api/statuses/update.xml";
 181 static const char *identica_public_url  = "http://identi.ca/api/statuses/public_timeline.xml";
 182 static const char *identica_friends_url = "http://identi.ca/api/statuses/friends_timeline.xml";
 183 static const char *identica_replies_url = "http://identi.ca/api/statuses/replies.xml";
 184
 185 static CURL *curl_init(void)
 186 {
 187         CURL *curl;
 188
 189         curl = curl_easy_init();
 190         if (!curl) {
 191                 fprintf(stderr, "Can not init CURL!\n");
 192                 return NULL;
 193         }
 194         /* some ssl sanity checks on the connection we are making */
 195         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0);
 196         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0);
 197         return curl;
 198 }
 199
 200 static void parse_statuses(xmlDocPtr doc, xmlNodePtr current)
 201 {
 202         xmlChar *text = NULL;
 203         xmlChar *user = NULL;
 204         xmlNodePtr userinfo;
 205
 206         current = current->xmlChildrenNode;
 207         while (current != NULL) {
 208                 if (current->type == XML_ELEMENT_NODE) {
 209                         if (!xmlStrcmp(current->name, (const xmlChar *)"text"))
 210                                 text = xmlNodeListGetString(doc, current->xmlChildrenNode, 1);
 211                         if (!xmlStrcmp(current->name, (const xmlChar *)"user")) {
 212                                 userinfo = current->xmlChildrenNode;
 213                                 while (userinfo != NULL) {
 214                                         if ((!xmlStrcmp(userinfo->name, (const xmlChar *)"screen_name"))) {
 215                                                 if (user)
 216                                                         xmlFree(user);
 217                                                 user = xmlNodeListGetString(doc, userinfo->xmlChildrenNode, 1);
 218                                         }
 219                                         userinfo = userinfo->next;
 220                                 }
 221                         }
 222                         if (user && text) {
 223                                 printf("[%s] %s\n", user, text);
 224                                 xmlFree(user);
 225                                 xmlFree(text);
 226                                 user = NULL;
 227                                 text = NULL;
 228                         }
 229                 }
 230                 current = current->next;
 231         }
 232
 233         return;
 234 }
 235
 236 static void parse_timeline(char *document)
 237 {
 238         xmlDocPtr doc;
 239         xmlNodePtr current;
 240
 241         doc = xmlReadMemory(document, strlen(document), "timeline.xml",
 242                             NULL, XML_PARSE_NOERROR);
 243         if (doc == NULL)
 244                 return;
 245
 246         current = xmlDocGetRootElement(doc);
 247         if (current == NULL) {
 248                 fprintf(stderr, "empty document\n");
 249                 xmlFreeDoc(doc);
 250                 return;
 251         }
 252
 253         if (xmlStrcmp(current->name, (const xmlChar *) "statuses")) {
 254                 fprintf(stderr, "unexpected document type\n");
 255                 xmlFreeDoc(doc);
 256                 return;
 257         }
 258
 259         current = current->xmlChildrenNode;
 260         while (current != NULL) {
 261                 if ((!xmlStrcmp(current->name, (const xmlChar *)"status")))
 262                         parse_statuses(doc, current);
 263                 current = current->next;
 264         }
 265         xmlFreeDoc(doc);
 266
 267         return;
 268 }
 269
 270 static size_t curl_callback(void *buffer, size_t size, size_t nmemb,
 271                             void *userp)
 272 {
 273         struct bti_curl_buffer *curl_buf = userp;
 274         size_t buffer_size = size * nmemb;
 275         char *temp;
 276
 277         if ((!buffer) || (!buffer_size) || (!curl_buf))
 278                 return -EINVAL;
 279
 280         /* add to the data we already have */
 281         temp = zalloc(curl_buf->length + buffer_size + 1);
 282         if (!temp)
 283                 return -ENOMEM;
 284
 285         memcpy(temp, curl_buf->data, curl_buf->length);
 286         free(curl_buf->data);
 287         curl_buf->data = temp;
 288         memcpy(&curl_buf->data[curl_buf->length], (char *)buffer, buffer_size);
 289         curl_buf->length += buffer_size;
 290         if (curl_buf->action)
 291                 parse_timeline(curl_buf->data);
 292
 293         dbg("%s\n", curl_buf->data);
 294
 295         return buffer_size;
 296 }
 297
 298 static int send_request(struct session *session)
 299 {
 300         char user_password[500];
 301         char data[500];
 302         /* is there usernames longer than 22 chars? */
 303         char user_url[70];
 304         struct bti_curl_buffer *curl_buf;
 305         CURL *curl = NULL;
 306         CURLcode res;
 307         struct curl_httppost *formpost = NULL;
 308         struct curl_httppost *lastptr = NULL;
 309         struct curl_slist *slist = NULL;
 310
 311         if (!session)
 312                 return -EINVAL;
 313
 314         curl_buf = bti_curl_buffer_alloc(session->action);
 315         if (!curl_buf)
 316                 return -ENOMEM;
 317
 318         curl = curl_init();
 319         if (!curl)
 320                 return -EINVAL;
 321
 322         switch (session->action) {
 323         case ACTION_UPDATE:
 324                 snprintf(user_password, sizeof(user_password), "%s:%s",
 325                          session->account, session->password);
 326                 snprintf(data, sizeof(data), "status=\"%s\"", session->tweet);
 327                 curl_formadd(&formpost, &lastptr,
 328                              CURLFORM_COPYNAME, "status",
 329                              CURLFORM_COPYCONTENTS, session->tweet,
 330                              CURLFORM_END);
 331
 332                 curl_formadd(&formpost, &lastptr,
 333                              CURLFORM_COPYNAME, "source",
 334                              CURLFORM_COPYCONTENTS, "bti",
 335                              CURLFORM_END);
 336
 337                 curl_easy_setopt(curl, CURLOPT_HTTPPOST, formpost);
 338                 slist = curl_slist_append(slist, "Expect:");
 339                 curl_easy_setopt(curl, CURLOPT_HTTPHEADER, slist);
 340                 switch (session->host) {
 341                 case HOST_TWITTER:
 342                         curl_easy_setopt(curl, CURLOPT_URL,
 343                                          twitter_update_url);
 344                         break;
 345                 case HOST_IDENTICA:
 346                         curl_easy_setopt(curl, CURLOPT_URL,
 347                                          identica_update_url);
 348                         break;
 349                 }
 350                 curl_easy_setopt(curl, CURLOPT_USERPWD, user_password);
 351
 352                 break;
 353         case ACTION_FRIENDS:
 354                 snprintf(user_password, sizeof(user_password), "%s:%s",
 355                          session->account, session->password);
 356                 switch (session->host) {
 357                 case HOST_TWITTER:
 358                         sprintf(user_url, "%s?page=%d", twitter_friends_url, session->page);
 359                         curl_easy_setopt(curl, CURLOPT_URL, user_url);
 360                         break;
 361                 case HOST_IDENTICA:
 362                         sprintf(user_url, "%s?page=%d", identica_friends_url, session->page);
 363                         curl_easy_setopt(curl, CURLOPT_URL, user_url);
 364                         break;
 365                 }
 366                 curl_easy_setopt(curl, CURLOPT_USERPWD, user_password);
 367
 368                 break;
 369         case ACTION_USER:
 370                 switch (session->host) {
 371                 case HOST_TWITTER:
 372                         sprintf(user_url, "%s%s.xml?page=%d", twitter_user_url, session->user, session->page);
 373                         curl_easy_setopt(curl, CURLOPT_URL, user_url);
 374                         break;
 375                 case HOST_IDENTICA:
 376                         sprintf(user_url, "%s%s.xml?page=%d", identica_user_url, session->user, session->page);
 377                         curl_easy_setopt(curl, CURLOPT_URL, user_url);
 378                         break;
 379                 }
 380
 381                 break;
 382         case ACTION_REPLIES:
 383                 snprintf(user_password, sizeof(user_password), "%s:%s",
 384                          session->account, session->password);
 385                 switch (session->host) {
 386                 case HOST_TWITTER:
 387                         sprintf(user_url, "%s?page=%d", twitter_replies_url, session->page);
 388                         curl_easy_setopt(curl, CURLOPT_URL, user_url);
 389                         break;
 390                 case HOST_IDENTICA:
 391                         sprintf(user_url, "%s?page=%d", identica_replies_url, session->page);
 392                         curl_easy_setopt(curl, CURLOPT_URL, user_url);
 393                         break;
 394                 }
 395                 curl_easy_setopt(curl, CURLOPT_USERPWD, user_password);
 396
 397                 break;
 398         case ACTION_PUBLIC:
 399                 switch (session->host) {
 400                 case HOST_TWITTER:
 401                         sprintf(user_url, "%s?page=%d", twitter_public_url, session->page);
 402                         curl_easy_setopt(curl, CURLOPT_URL, user_url);
 403                         break;
 404                 case HOST_IDENTICA:
 405                         sprintf(user_url, "%s?page=%d", identica_public_url, session->page);
 406                         curl_easy_setopt(curl, CURLOPT_URL, user_url);
 407                         break;
 408                 }
 409
 410                 break;
 411         default:
 412                 break;
 413         }
 414
 415         if (session->proxy)
 416                 curl_easy_setopt(curl, CURLOPT_PROXY, session->proxy);
 417
 418         if (debug)
 419                 curl_easy_setopt(curl, CURLOPT_VERBOSE, 1);
 420
 421         dbg("user_password = %s\n", user_password);
 422         dbg("data = %s\n", data);
 423         dbg("proxy = %s\n", session->proxy);
 424
 425         curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, curl_callback);
 426         curl_easy_setopt(curl, CURLOPT_WRITEDATA, curl_buf);
 427         if (!session->dry_run) {
 428                 res = curl_easy_perform(curl);
 429                 if (res && !session->bash) {
 430                         fprintf(stderr, "error(%d) trying to perform "
 431                                 "operation\n", res);
 432                         return -EINVAL;
 433                 }
 434         }
 435
 436         curl_easy_cleanup(curl);
 437         if (session->action == ACTION_UPDATE)
 438                 curl_formfree(formpost);
 439         bti_curl_buffer_free(curl_buf);
 440         return 0;
 441 }
 442
 443 static void parse_configfile(struct session *session)
 444 {
 445         FILE *config_file;
 446         char *line = NULL;
 447         size_t len = 0;
 448         char *account = NULL;
 449         char *password = NULL;
 450         char *host = NULL;
 451         char *proxy = NULL;
 452         char *logfile = NULL;
 453         char *action = NULL;
 454         char *user = NULL;
 455         char *file;
 456         int shrink_urls = 0;
 457
 458         /* config file is ~/.bti  */
 459         file = alloca(strlen(session->homedir) + 7);
 460
 461         sprintf(file, "%s/.bti", session->homedir);
 462
 463         config_file = fopen(file, "r");
 464
 465         /* No error if file does not exist or is unreadable.  */
 466         if (config_file == NULL)
 467                 return;
 468
 469         do {
 470                 ssize_t n = getline(&line, &len, config_file);
 471                 if (n < 0)
 472                         break;
 473                 if (line[n - 1] == '\n')
 474                         line[n - 1] = '\0';
 475                 /* Parse file.  Format is the usual value pairs:
 476                    account=name
 477                    passwort=value
 478                    # is a comment character
 479                 */
 480                 *strchrnul(line, '#') = '\0';
 481                 char *c = line;
 482                 while (isspace(*c))
 483                         c++;
 484                 /* Ignore blank lines.  */
 485                 if (c[0] == '\0')
 486                         continue;
 487
 488                 if (!strncasecmp(c, "account", 7) && (c[7] == '=')) {
 489                         c += 8;
 490                         if (c[0] != '\0')
 491                                 account = strdup(c);
 492                 } else if (!strncasecmp(c, "password", 8) &&
 493                            (c[8] == '=')) {
 494                         c += 9;
 495                         if (c[0] != '\0')
 496                                 password = strdup(c);
 497                 } else if (!strncasecmp(c, "host", 4) &&
 498                            (c[4] == '=')) {
 499                         c += 5;
 500                         if (c[0] != '\0')
 501                                 host = strdup(c);
 502                 } else if (!strncasecmp(c, "proxy", 5) &&
 503                            (c[5] == '=')) {
 504                         c += 6;
 505                         if (c[0] != '\0')
 506                                 proxy = strdup(c);
 507                 } else if (!strncasecmp(c, "logfile", 7) &&
 508                            (c[7] == '=')) {
 509                         c += 8;
 510                         if (c[0] != '\0')
 511                                 logfile = strdup(c);
 512                 } else if (!strncasecmp(c, "action", 6) &&
 513                            (c[6] == '=')) {
 514                         c += 7;
 515                         if (c[0] != '\0')
 516                                 action = strdup(c);
 517                 } else if (!strncasecmp(c, "user", 4) &&
 518                                 (c[4] == '=')) {
 519                         c += 5;
 520                         if (c[0] != '\0')
 521                                 user = strdup(c);
 522                 } else if (!strncasecmp(c, "shrink-urls", 11) &&
 523                                 (c[11] == '=')) {
 524                         c += 12;
 525                         if (!strncasecmp(c, "true", 4) ||
 526                                         !strncasecmp(c, "yes", 3))
 527                                 shrink_urls = 1;
 528                 }
 529         } while (!feof(config_file));
 530
 531         if (password)
 532                 session->password = password;
 533         if (account)
 534                 session->account = account;
 535         if (host) {
 536                 if (strcasecmp(host, "twitter") == 0)
 537                         session->host = HOST_TWITTER;
 538                 if (strcasecmp(host, "identica") == 0)
 539                         session->host = HOST_IDENTICA;
 540                 free(host);
 541         }
 542         if (proxy) {
 543                 if (session->proxy)
 544                         free(session->proxy);
 545                 session->proxy = proxy;
 546         }
 547         if (logfile)
 548                 session->logfile = logfile;
 549         if (action) {
 550                 if (strcasecmp(action, "update") == 0)
 551                         session->action = ACTION_UPDATE;
 552                 else if (strcasecmp(action, "friends") == 0)
 553                         session->action = ACTION_FRIENDS;
 554                 else if (strcasecmp(action, "user") == 0)
 555                         session->action = ACTION_USER;
 556                 else if (strcasecmp(action, "replies") == 0)
 557                         session->action = ACTION_REPLIES;
 558                 else if (strcasecmp(action, "public") == 0)
 559                         session->action = ACTION_PUBLIC;
 560                 else
 561                         session->action = ACTION_UNKNOWN;
 562                 free(action);
 563         }
 564         if (user)
 565                 session->user = user;
 566         session->shrink_urls = shrink_urls;
 567
 568         /* Free buffer and close file.  */
 569         free(line);
 570         fclose(config_file);
 571 }
 572
 573 static void log_session(struct session *session, int retval)
 574 {
 575         FILE *log_file;
 576         char *filename;
 577         char *host;
 578
 579         /* Only log something if we have a log file set */
 580         if (!session->logfile)
 581                 return;
 582
 583         filename = alloca(strlen(session->homedir) +
 584                           strlen(session->logfile) + 3);
 585
 586         sprintf(filename, "%s/%s", session->homedir, session->logfile);
 587
 588         log_file = fopen(filename, "a+");
 589         if (log_file == NULL)
 590                 return;
 591         switch (session->host) {
 592         case HOST_TWITTER:
 593                 host = "twitter";
 594                 break;
 595         case HOST_IDENTICA:
 596                 host = "identi.ca";
 597                 break;
 598         default:
 599                 host = "unknown";
 600                 break;
 601         }
 602
 603         switch (session->action) {
 604         case ACTION_UPDATE:
 605                 if (retval)
 606                         fprintf(log_file, "%s: host=%s tweet failed\n",
 607                                 session->time, host);
 608                 else
 609                         fprintf(log_file, "%s: host=%s tweet=%s\n",
 610                                 session->time, host, session->tweet);
 611                 break;
 612         case ACTION_FRIENDS:
 613                 fprintf(log_file, "%s: host=%s retrieving friends timeline\n",
 614                         session->time, host);
 615                 break;
 616         case ACTION_USER:
 617                 fprintf(log_file, "%s: host=%s retrieving %s's timeline\n",
 618                         session->time, host, session->user);
 619                 break;
 620         case ACTION_REPLIES:
 621                 fprintf(log_file, "%s: host=%s retrieving replies\n",
 622                         session->time, host);
 623                 break;
 624         case ACTION_PUBLIC:
 625                 fprintf(log_file, "%s: host=%s retrieving public timeline\n",
 626                         session->time, host);
 627                 break;
 628         default:
 629                 break;
 630         }
 631
 632         fclose(log_file);
 633 }
 634
 635 static char *get_string_from_stdin(void)
 636 {
 637         char *temp;
 638         char *string;
 639
 640         string = zalloc(1000);
 641         if (!string)
 642                 return NULL;
 643
 644         if (!fgets(string, 999, stdin))
 645                 return NULL;
 646         temp = strchr(string, '\n');
 647         *temp = '\0';
 648         return string;
 649 }
 650
 651 static int find_urls(const char *tweet, int **pranges)
 652 {
 653         /*
 654          * magic obtained from
 655          * http://www.geekpedia.com/KB65_How-to-validate-an-URL-using-RegEx-in-Csharp.html
 656          */
 657         static const char *re_magic =
 658                 "(([a-zA-Z][0-9a-zA-Z+\\-\\.]*:)/{1,3}"
 659                 "[0-9a-zA-Z;/~?:@&=+$\\.\\-_'()%]+)"
 660                 "(#[0-9a-zA-Z;/?:@&=+$\\.\\-_!~*'()%]+)?";
 661         pcre *re;
 662         const char *errptr;
 663         int erroffset;
 664         int ovector[10] = {0,};
 665         const size_t ovsize = sizeof(ovector)/sizeof(*ovector);
 666         int startoffset, tweetlen;
 667         int i, rc;
 668         int rbound = 10;
 669         int rcount = 0;
 670         int *ranges = malloc(sizeof(int) * rbound);
 671
 672         re = pcre_compile(re_magic,
 673                         PCRE_NO_AUTO_CAPTURE,
 674                         &errptr, &erroffset, NULL);
 675         if (!re) {
 676                 fprintf(stderr, "pcre_compile @%u: %s\n", erroffset, errptr);
 677                 exit(1);
 678         }
 679
 680         tweetlen = strlen(tweet);
 681         for (startoffset = 0; startoffset < tweetlen; ) {
 682
 683                 rc = pcre_exec(re, NULL, tweet, strlen(tweet), startoffset, 0,
 684                                 ovector, ovsize);
 685                 if (rc == PCRE_ERROR_NOMATCH)
 686                         break;
 687
 688                 if (rc < 0) {
 689                         fprintf(stderr, "pcre_exec @%u: %s\n",
 690                                 erroffset, errptr);
 691                         exit(1);
 692                 }
 693
 694                 for (i = 0; i < rc; i += 2) {
 695                         if ((rcount+2) == rbound) {
 696                                 rbound *= 2;
 697                                 ranges = realloc(ranges, sizeof(int) * rbound);
 698                         }
 699
 700                         ranges[rcount++] = ovector[i];
 701                         ranges[rcount++] = ovector[i+1];
 702                 }
 703
 704                 startoffset = ovector[1];
 705         }
 706
 707         pcre_free(re);
 708
 709         *pranges = ranges;
 710         return rcount;
 711 }
 712
 713 /**
 714  * bidirectional popen() call
 715  *
 716  * @param rwepipe - int array of size three
 717  * @param exe - program to run
 718  * @param argv - argument list
 719  * @return pid or -1 on error
 720  *
 721  * The caller passes in an array of three integers (rwepipe), on successful
 722  * execution it can then write to element 0 (stdin of exe), and read from
 723  * element 1 (stdout) and 2 (stderr).
 724  */
 725 static int popenRWE(int *rwepipe, const char *exe, const char *const argv[])
 726 {
 727         int in[2];
 728         int out[2];
 729         int err[2];
 730         int pid;
 731         int rc;
 732
 733         rc = pipe(in);
 734         if (rc < 0)
 735                 goto error_in;
 736
 737         rc = pipe(out);
 738         if (rc < 0)
 739                 goto error_out;
 740
 741         rc = pipe(err);
 742         if (rc < 0)
 743                 goto error_err;
 744
 745         pid = fork();
 746         if (pid > 0) {
 747                 /* parent */
 748                 close(in[0]);
 749                 close(out[1]);
 750                 close(err[1]);
 751                 rwepipe[0] = in[1];
 752                 rwepipe[1] = out[0];
 753                 rwepipe[2] = err[0];
 754                 return pid;
 755         } else if (pid == 0) {
 756                 /* child */
 757                 close(in[1]);
 758                 close(out[0]);
 759                 close(err[0]);
 760                 close(0);
 761                 rc = dup(in[0]);
 762                 close(1);
 763                 rc = dup(out[1]);
 764                 close(2);
 765                 rc = dup(err[1]);
 766
 767                 execvp(exe, (char **)argv);
 768                 exit(1);
 769         } else
 770                 goto error_fork;
 771
 772         return pid;
 773
 774 error_fork:
 775         close(err[0]);
 776         close(err[1]);
 777 error_err:
 778         close(out[0]);
 779         close(out[1]);
 780 error_out:
 781         close(in[0]);
 782         close(in[1]);
 783 error_in:
 784         return -1;
 785 }
 786
 787 static int pcloseRWE(int pid, int *rwepipe)
 788 {
 789         int rc, status;
 790         close(rwepipe[0]);
 791         close(rwepipe[1]);
 792         close(rwepipe[2]);
 793         rc = waitpid(pid, &status, 0);
 794         return status;
 795 }
 796
 797 static char *shrink_one_url(int *rwepipe, char *big)
 798 {
 799         int biglen = strlen(big);
 800         char *small;
 801         int smalllen;
 802         int rc;
 803
 804         rc = dprintf(rwepipe[0], "%s\n", big);
 805         if (rc < 0)
 806                 return big;
 807
 808         smalllen = biglen + 128;
 809         small = malloc(smalllen);
 810         if (!small)
 811                 return big;
 812
 813         rc = read(rwepipe[1], small, smalllen);
 814         if (rc < 0 || rc > biglen)
 815                 goto error_free_small;
 816
 817         if (strncmp(small, "http://", 7))
 818                 goto error_free_small;
 819
 820         smalllen = rc;
 821         while (smalllen && isspace(small[smalllen-1]))
 822                         small[--smalllen] = 0;
 823
 824         free(big);
 825         return small;
 826
 827 error_free_small:
 828         free(small);
 829         return big;
 830 }
 831
 832 static char *shrink_urls(char *text)
 833 {
 834         int *ranges;
 835         int rcount;
 836         int i;
 837         int inofs = 0;
 838         int outofs = 0;
 839         const char *const shrink_args[] = {
 840                 "bti-shrink-urls",
 841                 NULL
 842         };
 843         int shrink_pid;
 844         int shrink_pipe[3];
 845         int inlen = strlen(text);
 846
 847         dbg("before len=%u\n", inlen);
 848
 849         shrink_pid = popenRWE(shrink_pipe, shrink_args[0], shrink_args);
 850         if (shrink_pid < 0)
 851                 return text;
 852
 853         rcount = find_urls(text, &ranges);
 854         if (!rcount)
 855                 return text;
 856
 857         for (i = 0; i < rcount; i += 2) {
 858                 int url_start = ranges[i];
 859                 int url_end = ranges[i+1];
 860                 int long_url_len = url_end - url_start;
 861                 char *url = strndup(text + url_start, long_url_len);
 862                 int short_url_len;
 863                 int not_url_len = url_start - inofs;
 864
 865                 dbg("long  url[%u]: %s\n", long_url_len, url);
 866                 url = shrink_one_url(shrink_pipe, url);
 867                 short_url_len = url ? strlen(url) : 0;
 868                 dbg("short url[%u]: %s\n", short_url_len, url);
 869
 870                 if (!url || short_url_len >= long_url_len) {
 871                         /* The short url ended up being too long
 872                          * or unavailable */
 873                         if (inofs) {
 874                                 strncpy(text + outofs, text + inofs,
 875                                                 not_url_len + long_url_len);
 876                         }
 877                         inofs += not_url_len + long_url_len;
 878                         outofs += not_url_len + long_url_len;
 879
 880                 } else {
 881                         /* copy the unmodified block */
 882                         strncpy(text + outofs, text + inofs, not_url_len);
 883                         inofs += not_url_len;
 884                         outofs += not_url_len;
 885
 886                         /* copy the new url */
 887                         strncpy(text + outofs, url, short_url_len);
 888                         inofs += long_url_len;
 889                         outofs += short_url_len;
 890                 }
 891
 892                 free(url);
 893         }
 894
 895         /* copy the last block after the last match */
 896         if (inofs) {
 897                 int tail = inlen - inofs;
 898                 if (tail) {
 899                         strncpy(text + outofs, text + inofs, tail);
 900                         outofs += tail;
 901                 }
 902         }
 903
 904         free(ranges);
 905
 906         (void)pcloseRWE(shrink_pid, shrink_pipe);
 907
 908         text[outofs] = 0;
 909         dbg("after len=%u\n", outofs);
 910         return text;
 911 }
 912
 913 int main(int argc, char *argv[], char *envp[])
 914 {
 915         static const struct option options[] = {
 916                 { "debug", 0, NULL, 'd' },
 917                 { "account", 1, NULL, 'a' },
 918                 { "password", 1, NULL, 'p' },
 919                 { "host", 1, NULL, 'H' },
 920                 { "proxy", 1, NULL, 'P' },
 921                 { "action", 1, NULL, 'A' },
 922                 { "user", 1, NULL, 'u' },
 923                 { "logfile", 1, NULL, 'L' },
 924                 { "shrink-urls", 0, NULL, 's' },
 925                 { "help", 0, NULL, 'h' },
 926                 { "bash", 0, NULL, 'b' },
 927                 { "dry-run", 0, NULL, 'n' },
 928                 { "page", 1, NULL, 'g' },
 929                 { "version", 0, NULL, 'v' },
 930                 { }
 931         };
 932         struct session *session;
 933         pid_t child;
 934         char *tweet;
 935         int retval = 0;
 936         int option;
 937         char *http_proxy;
 938         time_t t;
 939         int page_nr;
 940
 941         debug = 0;
 942         rl_bind_key('\t', rl_insert);
 943
 944         session = session_alloc();
 945         if (!session) {
 946                 fprintf(stderr, "no more memory...\n");
 947                 return -1;
 948         }
 949
 950         /* get the current time so that we can log it later */
 951         time(&t);
 952         session->time = strdup(ctime(&t));
 953         session->time[strlen(session->time)-1] = 0x00;
 954
 955         session->homedir = strdup(getenv("HOME"));
 956
 957         curl_global_init(CURL_GLOBAL_ALL);
 958
 959         /* Set environment variables first, before reading command line options
 960          * or config file values. */
 961         http_proxy = getenv("http_proxy");
 962         if (http_proxy) {
 963                 if (session->proxy)
 964                         free(session->proxy);
 965                 session->proxy = strdup(http_proxy);
 966                 dbg("http_proxy = %s\n", session->proxy);
 967         }
 968
 969         parse_configfile(session);
 970
 971         while (1) {
 972                 option = getopt_long_only(argc, argv, "dqe:p:P:H:a:A:u:hg:sn",
 973                                           options, NULL);
 974                 if (option == -1)
 975                         break;
 976                 switch (option) {
 977                 case 'd':
 978                         debug = 1;
 979                         break;
 980                 case 'a':
 981                         if (session->account)
 982                                 free(session->account);
 983                         session->account = strdup(optarg);
 984                         dbg("account = %s\n", session->account);
 985                         break;
 986                 case 'g':
 987                         page_nr = atoi(optarg);
 988                         dbg("page = %d\n", page_nr);
 989                         session->page = page_nr;
 990                         break;
 991                 case 'p':
 992                         if (session->password)
 993                                 free(session->password);
 994                         session->password = strdup(optarg);
 995                         dbg("password = %s\n", session->password);
 996                         break;
 997                 case 'P':
 998                         if (session->proxy)
 999                                 free(session->proxy);
1000                         session->proxy = strdup(optarg);
1001                         dbg("proxy = %s\n", session->proxy);
1002                         break;
1003                 case 'A':
1004                         if (strcasecmp(optarg, "update") == 0)
1005                                 session->action = ACTION_UPDATE;
1006                         else if (strcasecmp(optarg, "friends") == 0)
1007                                 session->action = ACTION_FRIENDS;
1008                         else if (strcasecmp(optarg, "user") == 0)
1009                                 session->action = ACTION_USER;
1010                         else if (strcasecmp(optarg, "replies") == 0)
1011                                 session->action = ACTION_REPLIES;
1012                         else if (strcasecmp(optarg, "public") == 0)
1013                                 session->action = ACTION_PUBLIC;
1014                         else
1015                                 session->action = ACTION_UNKNOWN;
1016                         dbg("action = %d\n", session->action);
1017                         break;
1018                 case 'u':
1019                         if (session->user)
1020                                 free(session->user);
1021                         session->user = strdup(optarg);
1022                         dbg("user = %s\n", session->user);
1023                         break;
1024                 case 'L':
1025                         if (session->logfile)
1026                                 free(session->logfile);
1027                         session->logfile = strdup(optarg);
1028                         dbg("logfile = %s\n", session->logfile);
1029                         break;
1030                 case 's':
1031                         session->shrink_urls = 1;
1032                         break;
1033                 case 'H':
1034                         if (strcasecmp(optarg, "twitter") == 0)
1035                                 session->host = HOST_TWITTER;
1036                         if (strcasecmp(optarg, "identica") == 0)
1037                                 session->host = HOST_IDENTICA;
1038                         dbg("host = %d\n", session->host);
1039                         break;
1040                 case 'b':
1041                         session->bash = 1;
1042                         break;
1043                 case 'h':
1044                         display_help();
1045                         goto exit;
1046                 case 'n':
1047                         session->dry_run = 1;
1048                         break;
1049                 case 'v':
1050                         display_version();
1051                         goto exit;
1052                 default:
1053                         display_help();
1054                         goto exit;
1055                 }
1056         }
1057
1058         /*
1059          * Show the version to make it easier to determine what
1060          * is going on here
1061          */
1062         if (debug)
1063                 display_version();
1064
1065         if (session->action == ACTION_UNKNOWN) {
1066                 fprintf(stderr, "Unknown action, valid actions are:\n");
1067                 fprintf(stderr, "'update', 'friends', 'public', "
1068                         "'replies' or 'user'.\n");
1069                 goto exit;
1070         }
1071
1072         if (!session->account) {
1073                 fprintf(stdout, "Enter twitter account: ");
1074                 session->account = readline(NULL);
1075         }
1076
1077         if (!session->password) {
1078                 fprintf(stdout, "Enter twitter password: ");
1079                 session->password = readline(NULL);
1080         }
1081
1082         if (session->action == ACTION_UPDATE) {
1083                 if (session->bash)
1084                         tweet = get_string_from_stdin();
1085                 else
1086                         tweet = readline("tweet: ");
1087                 if (!tweet || strlen(tweet) == 0) {
1088                         dbg("no tweet?\n");
1089                         return -1;
1090                 }
1091
1092                 if (session->shrink_urls)
1093                         tweet = shrink_urls(tweet);
1094
1095                 session->tweet = zalloc(strlen(tweet) + 10);
1096                 if (session->bash)
1097                         sprintf(session->tweet, "%c %s", getuid() ? '$' : '#', tweet);
1098                 else
1099                         sprintf(session->tweet, "%s", tweet);
1100
1101                 free(tweet);
1102                 dbg("tweet = %s\n", session->tweet);
1103         }
1104
1105         if (!session->user)
1106                 session->user = strdup(session->account);
1107
1108         if (session->page == 0)
1109                 session->page = 1;
1110         dbg("account = %s\n", session->account);
1111         dbg("password = %s\n", session->password);
1112         dbg("host = %d\n", session->host);
1113         dbg("action = %d\n", session->action);
1114
1115         /* fork ourself so that the main shell can get on
1116          * with it's life as we try to connect and handle everything
1117          */
1118         if (session->bash) {
1119                 child = fork();
1120                 if (child) {
1121                         dbg("child is %d\n", child);
1122                         exit(0);
1123                 }
1124         }
1125
1126         retval = send_request(session);
1127         if (retval && !session->bash)
1128                 fprintf(stderr, "operation failed\n");
1129
1130         log_session(session, retval);
1131 exit:
1132         session_free(session);
1133         return retval;;
1134 }