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