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