bti.c

   1 /*
   2  * Copyright (C) 2008-2010 Greg Kroah-Hartman <greg@kroah.com>
   3  * Copyright (C) 2009 Bart Trojanowski <bart@jukie.net>
   4  * Copyright (C) 2009-2010 Amir Mohammad Saied <amirsaied@gmail.com>
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License as published by the
   8  * Free Software Foundation version 2 of the License.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  18  */
  19
  20 #define _GNU_SOURCE
  21
  22 #include <stdio.h>
  23 #include <stdlib.h>
  24 #include <stddef.h>
  25 #include <string.h>
  26 #include <getopt.h>
  27 #include <errno.h>
  28 #include <ctype.h>
  29 #include <fcntl.h>
  30 #include <unistd.h>
  31 #include <time.h>
  32 #include <sys/stat.h>
  33 #include <sys/types.h>
  34 #include <sys/wait.h>
  35 #include <curl/curl.h>
  36 #include <libxml/xmlmemory.h>
  37 #include <libxml/parser.h>
  38 #include <libxml/tree.h>
  39 #include <pcre.h>
  40 #include <termios.h>
  41 #include <dlfcn.h>
  42 #include <oauth.h>
  43
  44
  45 #define zalloc(size)    calloc(size, 1)
  46
  47 #define dbg(format, arg...)                                             \
  48         do {                                                            \
  49                 if (debug)                                              \
  50                         fprintf(stdout, "bti: %s: " format , __func__ , \
  51                                 ## arg);                                \
  52         } while (0)
  53
  54
  55 static int debug;
  56 static int verbose;
  57
  58 enum host {
  59         HOST_TWITTER  = 0,
  60         HOST_IDENTICA = 1,
  61         HOST_CUSTOM   = 2
  62 };
  63
  64 enum action {
  65         ACTION_UPDATE  = 0,
  66         ACTION_FRIENDS = 1,
  67         ACTION_USER    = 2,
  68         ACTION_REPLIES = 4,
  69         ACTION_PUBLIC  = 8,
  70         ACTION_GROUP   = 16,
  71         ACTION_UNKNOWN = 32
  72 };
  73
  74 struct session {
  75         char *password;
  76         char *account;
  77         char *consumer_key;
  78         char *consumer_secret;
  79         char *access_token_key;
  80         char *access_token_secret;
  81         char *tweet;
  82         char *proxy;
  83         char *time;
  84         char *homedir;
  85         char *logfile;
  86         char *user;
  87         char *group;
  88         char *hosturl;
  89         char *hostname;
  90         char *configfile;
  91         char *replyto;
  92         int bash;
  93         int background;
  94         int interactive;
  95         int shrink_urls;
  96         int dry_run;
  97         int page;
  98         int no_oauth;
  99         enum host host;
 100         enum action action;
 101         void *readline_handle;
 102         char *(*readline)(const char *);
 103 };
 104
 105 struct bti_curl_buffer {
 106         char *data;
 107         enum action action;
 108         int length;
 109 };
 110
 111 static void display_help(void)
 112 {
 113         fprintf(stdout, "bti - send tweet to twitter or identi.ca\n"
 114                 "Version: %s\n"
 115                 "Usage:\n"
 116                 "  bti [options]\n"
 117                 "options are:\n"
 118                 "  --account accountname\n"
 119                 "  --password password\n"
 120                 "  --action action\n"
 121                 "    ('update', 'friends', 'public', 'replies', or 'user')\n"
 122                 "  --user screenname\n"
 123                 "  --group groupname\n"
 124                 "  --proxy PROXY:PORT\n"
 125                 "  --host HOST\n"
 126                 "  --logfile logfile\n"
 127                 "  --config configfile\n"
 128                 "  --replyto ID\n"
 129                 "  --shrink-urls\n"
 130                 "  --page PAGENUMBER\n"
 131                 "  --bash\n"
 132                 "  --background\n"
 133                 "  --debug\n"
 134                 "  --verbose\n"
 135                 "  --dry-run\n"
 136                 "  --version\n"
 137                 "  --help\n", VERSION);
 138 }
 139
 140 static void display_version(void)
 141 {
 142         fprintf(stdout, "bti - version %s\n", VERSION);
 143 }
 144
 145 static char *get_string(const char *name)
 146 {
 147         char *temp;
 148         char *string;
 149
 150         string = zalloc(1000);
 151         if (!string)
 152                 exit(1);
 153         if (name != NULL)
 154                 fprintf(stdout, "%s", name);
 155         if (!fgets(string, 999, stdin))
 156                 return NULL;
 157         temp = strchr(string, '\n');
 158         if (temp)
 159                 *temp = '\0';
 160         return string;
 161 }
 162
 163 /*
 164  * Try to get a handle to a readline function from a variety of different
 165  * libraries.  If nothing is present on the system, then fall back to an
 166  * internal one.
 167  *
 168  * Logic originally based off of code in the e2fsutils package in the
 169  * lib/ss/get_readline.c file, which is licensed under the MIT license.
 170  *
 171  * This keeps us from having to relicense the bti codebase if readline
 172  * ever changes its license, as there is no link-time dependancy.
 173  * It is a run-time thing only, and we handle any readline-like library
 174  * in the same manner, making bti not be a derivative work of any
 175  * other program.
 176  */
 177 static void session_readline_init(struct session *session)
 178 {
 179         /* Libraries we will try to use for readline/editline functionality */
 180         const char *libpath = "libreadline.so.6:libreadline.so.5:"
 181                                 "libreadline.so.4:libreadline.so:libedit.so.2:"
 182                                 "libedit.so:libeditline.so.0:libeditline.so";
 183         void *handle = NULL;
 184         char *tmp, *cp, *next;
 185         int (*bind_key)(int, void *);
 186         void (*insert)(void);
 187
 188         /* default to internal function if we can't or won't find anything */
 189         session->readline = get_string;
 190         if (!isatty(0))
 191                 return;
 192         session->interactive = 1;
 193
 194         tmp = malloc(strlen(libpath)+1);
 195         if (!tmp)
 196                 return;
 197         strcpy(tmp, libpath);
 198         for (cp = tmp; cp; cp = next) {
 199                 next = strchr(cp, ':');
 200                 if (next)
 201                         *next++ = 0;
 202                 if (*cp == 0)
 203                         continue;
 204                 handle = dlopen(cp, RTLD_NOW);
 205                 if (handle) {
 206                         dbg("Using %s for readline library\n", cp);
 207                         break;
 208                 }
 209         }
 210         free(tmp);
 211         if (!handle) {
 212                 dbg("No readline library found.\n");
 213                 return;
 214         }
 215
 216         session->readline_handle = handle;
 217         session->readline = (char *(*)(const char *))dlsym(handle, "readline");
 218         if (session->readline == NULL) {
 219                 /* something odd happened, default back to internal stuff */
 220                 session->readline_handle = NULL;
 221                 session->readline = get_string;
 222                 return;
 223         }
 224
 225         /*
 226          * If we found a library, turn off filename expansion
 227          * as that makes no sense from within bti.
 228          */
 229         bind_key = (int (*)(int, void *))dlsym(handle, "rl_bind_key");
 230         insert = (void (*)(void))dlsym(handle, "rl_insert");
 231         if (bind_key && insert)
 232                 bind_key('\t', insert);
 233 }
 234
 235 static void session_readline_cleanup(struct session *session)
 236 {
 237         if (session->readline_handle)
 238                 dlclose(session->readline_handle);
 239 }
 240
 241 static struct session *session_alloc(void)
 242 {
 243         struct session *session;
 244
 245         session = zalloc(sizeof(*session));
 246         if (!session)
 247                 return NULL;
 248         return session;
 249 }
 250
 251 static void session_free(struct session *session)
 252 {
 253         if (!session)
 254                 return;
 255         free(session->replyto);
 256         free(session->password);
 257         free(session->account);
 258         free(session->consumer_key);
 259         free(session->consumer_secret);
 260         free(session->access_token_key);
 261         free(session->access_token_secret);
 262         free(session->tweet);
 263         free(session->proxy);
 264         free(session->time);
 265         free(session->homedir);
 266         free(session->user);
 267         free(session->group);
 268         free(session->hosturl);
 269         free(session->hostname);
 270         free(session->configfile);
 271         free(session);
 272 }
 273
 274 static struct bti_curl_buffer *bti_curl_buffer_alloc(enum action action)
 275 {
 276         struct bti_curl_buffer *buffer;
 277
 278         buffer = zalloc(sizeof(*buffer));
 279         if (!buffer)
 280                 return NULL;
 281
 282         /* start out with a data buffer of 1 byte to
 283          * make the buffer fill logic simpler */
 284         buffer->data = zalloc(1);
 285         if (!buffer->data) {
 286                 free(buffer);
 287                 return NULL;
 288         }
 289         buffer->length = 0;
 290         buffer->action = action;
 291         return buffer;
 292 }
 293
 294 static void bti_curl_buffer_free(struct bti_curl_buffer *buffer)
 295 {
 296         if (!buffer)
 297                 return;
 298         free(buffer->data);
 299         free(buffer);
 300 }
 301
 302 static const char twitter_host[]  = "http://api.twitter.com/1/statuses";
 303 static const char identica_host[] = "https://identi.ca/api/statuses";
 304 static const char twitter_name[]  = "twitter";
 305 static const char identica_name[] = "identi.ca";
 306
 307 static const char twitter_request_token_uri[]  = "http://twitter.com/oauth/request_token";
 308 static const char twitter_access_token_uri[]   = "http://twitter.com/oauth/access_token";
 309 static const char twitter_authorize_uri[]      = "http://twitter.com/oauth/authorize?oauth_token=";
 310 static const char identica_request_token_uri[] = "http://identi.ca/api/oauth/request_token?oauth_callback=oob";
 311 static const char identica_access_token_uri[]  = "http://identi.ca/api/oauth/access_token";
 312 static const char identica_authorize_uri[]     = "http://identi.ca/api/oauth/authorize?oauth_token=";
 313
 314 static const char user_uri[]     = "/user_timeline/";
 315 static const char update_uri[]   = "/update.xml";
 316 static const char public_uri[]   = "/public_timeline.xml";
 317 static const char friends_uri[]  = "/friends_timeline.xml";
 318 static const char mentions_uri[] = "/mentions.xml";
 319 static const char replies_uri[]  = "/replies.xml";
 320 static const char group_uri[]    = "/../statusnet/groups/timeline/";
 321
 322 static CURL *curl_init(void)
 323 {
 324         CURL *curl;
 325
 326         curl = curl_easy_init();
 327         if (!curl) {
 328                 fprintf(stderr, "Can not init CURL!\n");
 329                 return NULL;
 330         }
 331         /* some ssl sanity checks on the connection we are making */
 332         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0);
 333         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0);
 334         return curl;
 335 }
 336
 337 static void parse_statuses(xmlDocPtr doc, xmlNodePtr current)
 338 {
 339         xmlChar *text = NULL;
 340         xmlChar *user = NULL;
 341         xmlChar *created = NULL;
 342         xmlChar *id = NULL;
 343         xmlNodePtr userinfo;
 344
 345         current = current->xmlChildrenNode;
 346         while (current != NULL) {
 347                 if (current->type == XML_ELEMENT_NODE) {
 348                         if (!xmlStrcmp(current->name, (const xmlChar *)"created_at"))
 349                                 created = xmlNodeListGetString(doc, current->xmlChildrenNode, 1);
 350                         if (!xmlStrcmp(current->name, (const xmlChar *)"text"))
 351                                 text = xmlNodeListGetString(doc, current->xmlChildrenNode, 1);
 352                         if (!xmlStrcmp(current->name, (const xmlChar *)"id"))
 353                                 id = xmlNodeListGetString(doc, current->xmlChildrenNode, 1);
 354                         if (!xmlStrcmp(current->name, (const xmlChar *)"user")) {
 355                                 userinfo = current->xmlChildrenNode;
 356                                 while (userinfo != NULL) {
 357                                         if ((!xmlStrcmp(userinfo->name, (const xmlChar *)"screen_name"))) {
 358                                                 if (user)
 359                                                         xmlFree(user);
 360                                                 user = xmlNodeListGetString(doc, userinfo->xmlChildrenNode, 1);
 361                                         }
 362                                         userinfo = userinfo->next;
 363                                 }
 364                         }
 365
 366                         if (user && text && created && id) {
 367                                 if (verbose)
 368                                         printf("[%s] {%s} (%.16s) %s\n",
 369                                                 user, id, created, text);
 370                                 else
 371                                         printf("[%s] %s\n",
 372                                                 user, text);
 373                                 xmlFree(user);
 374                                 xmlFree(text);
 375                                 xmlFree(created);
 376                                 xmlFree(id);
 377                                 user = NULL;
 378                                 text = NULL;
 379                                 created = NULL;
 380                                 id = NULL;
 381                         }
 382                 }
 383                 current = current->next;
 384         }
 385
 386         return;
 387 }
 388
 389 static void parse_timeline(char *document)
 390 {
 391         xmlDocPtr doc;
 392         xmlNodePtr current;
 393
 394         doc = xmlReadMemory(document, strlen(document), "timeline.xml",
 395                             NULL, XML_PARSE_NOERROR);
 396         if (doc == NULL)
 397                 return;
 398
 399         current = xmlDocGetRootElement(doc);
 400         if (current == NULL) {
 401                 fprintf(stderr, "empty document\n");
 402                 xmlFreeDoc(doc);
 403                 return;
 404         }
 405
 406         if (xmlStrcmp(current->name, (const xmlChar *) "statuses")) {
 407                 fprintf(stderr, "unexpected document type\n");
 408                 xmlFreeDoc(doc);
 409                 return;
 410         }
 411
 412         current = current->xmlChildrenNode;
 413         while (current != NULL) {
 414                 if ((!xmlStrcmp(current->name, (const xmlChar *)"status")))
 415                         parse_statuses(doc, current);
 416                 current = current->next;
 417         }
 418         xmlFreeDoc(doc);
 419
 420         return;
 421 }
 422
 423 static size_t curl_callback(void *buffer, size_t size, size_t nmemb,
 424                             void *userp)
 425 {
 426         struct bti_curl_buffer *curl_buf = userp;
 427         size_t buffer_size = size * nmemb;
 428         char *temp;
 429
 430         if ((!buffer) || (!buffer_size) || (!curl_buf))
 431                 return -EINVAL;
 432
 433         /* add to the data we already have */
 434         temp = zalloc(curl_buf->length + buffer_size + 1);
 435         if (!temp)
 436                 return -ENOMEM;
 437
 438         memcpy(temp, curl_buf->data, curl_buf->length);
 439         free(curl_buf->data);
 440         curl_buf->data = temp;
 441         memcpy(&curl_buf->data[curl_buf->length], (char *)buffer, buffer_size);
 442         curl_buf->length += buffer_size;
 443         if (curl_buf->action)
 444                 parse_timeline(curl_buf->data);
 445
 446         dbg("%s\n", curl_buf->data);
 447
 448         return buffer_size;
 449 }
 450
 451 static int parse_osp_reply(const char *reply, char **token, char **secret)
 452 {
 453         int rc;
 454         int retval = 1;
 455         char **rv = NULL;
 456         rc = oauth_split_url_parameters(reply, &rv);
 457         qsort(rv, rc, sizeof(char *), oauth_cmpstringp);
 458         if (rc == 2 || rc == 4) {
 459                 if (!strncmp(rv[0], "oauth_token=", 11) &&
 460                     !strncmp(rv[1], "oauth_token_secret=", 18)) {
 461                         if (token)
 462                                 *token = strdup(&(rv[0][12]));
 463                         if (secret)
 464                                 *secret = strdup(&(rv[1][19]));
 465
 466                         retval = 0;
 467                 }
 468         } else if (rc == 3) {
 469                 if (!strncmp(rv[1], "oauth_token=", 11) &&
 470                     !strncmp(rv[2], "oauth_token_secret=", 18)) {
 471                         if (token)
 472                                 *token = strdup(&(rv[1][12]));
 473                         if (secret)
 474                                 *secret = strdup(&(rv[2][19]));
 475
 476                         retval = 0;
 477                 }
 478         }
 479
 480         dbg("token: %s\n", *token);
 481         dbg("secret: %s\n", *secret);
 482
 483         if (rv)
 484                 free(rv);
 485
 486         return retval;
 487 }
 488
 489 static int request_access_token(struct session *session)
 490 {
 491         char *post_params = NULL;
 492         char *request_url = NULL;
 493         char *reply       = NULL;
 494         char *at_key      = NULL;
 495         char *at_secret   = NULL;
 496         char *verifier    = NULL;
 497         char at_uri[90];
 498
 499         if (!session)
 500                 return -EINVAL;
 501
 502         if (session->host == HOST_TWITTER)
 503                 request_url = oauth_sign_url2(
 504                                 twitter_request_token_uri, NULL,
 505                                 OA_HMAC, NULL, session->consumer_key,
 506                                 session->consumer_secret, NULL, NULL);
 507         else if (session->host == HOST_IDENTICA)
 508                 request_url = oauth_sign_url2(
 509                                 identica_request_token_uri, NULL,
 510                                 OA_HMAC, NULL, session->consumer_key,
 511                                 session->consumer_secret, NULL, NULL);
 512         reply = oauth_http_get(request_url, post_params);
 513
 514         if (request_url)
 515                 free(request_url);
 516
 517         if (post_params)
 518                 free(post_params);
 519
 520         if (!reply)
 521                 return 1;
 522
 523         if (parse_osp_reply(reply, &at_key, &at_secret))
 524                 return 1;
 525
 526         free(reply);
 527
 528         fprintf(stdout,
 529                 "Please open the following link in your browser, and "
 530                 "allow 'bti' to access your account. Then paste "
 531                 "back the provided PIN in here.\n");
 532         if (session->host == HOST_TWITTER) {
 533                 fprintf(stdout, "%s%s\nPIN: ", twitter_authorize_uri, at_key);
 534                 verifier = session->readline(NULL);
 535                 sprintf(at_uri, "%s?oauth_verifier=%s",
 536                         twitter_access_token_uri, verifier);
 537         } else if (session->host == HOST_IDENTICA) {
 538                 fprintf(stdout, "%s%s\nPIN: ", identica_authorize_uri, at_key);
 539                 verifier = session->readline(NULL);
 540                 sprintf(at_uri, "%s?oauth_verifier=%s",
 541                         identica_access_token_uri, verifier);
 542         }
 543         request_url = oauth_sign_url2(at_uri, NULL, OA_HMAC, NULL,
 544                                       session->consumer_key,
 545                                       session->consumer_secret,
 546                                       at_key, at_secret);
 547         reply = oauth_http_get(request_url, post_params);
 548
 549         if (!reply)
 550                 return 1;
 551
 552         if (parse_osp_reply(reply, &at_key, &at_secret))
 553                 return 1;
 554
 555         free(reply);
 556
 557         fprintf(stdout,
 558                 "Please put these two lines in your bti "
 559                 "configuration file (~/.bti):\n"
 560                 "access_token_key=%s\n"
 561                 "access_token_secret=%s\n",
 562                 at_key, at_secret);
 563
 564         return 0;
 565 }
 566
 567 static int send_request(struct session *session)
 568 {
 569         char endpoint[500];
 570         char user_password[500];
 571         char data[500];
 572         struct bti_curl_buffer *curl_buf;
 573         CURL *curl = NULL;
 574         CURLcode res;
 575         struct curl_httppost *formpost = NULL;
 576         struct curl_httppost *lastptr = NULL;
 577         struct curl_slist *slist = NULL;
 578         char *req_url = NULL;
 579         char *reply = NULL;
 580         char *postarg = NULL;
 581         char *escaped_tweet = NULL;
 582         int is_post = 0;
 583
 584         if (!session)
 585                 return -EINVAL;
 586
 587         if (!session->hosturl)
 588                 session->hosturl = strdup(twitter_host);
 589
 590         if (session->no_oauth) {
 591                 curl_buf = bti_curl_buffer_alloc(session->action);
 592                 if (!curl_buf)
 593                         return -ENOMEM;
 594
 595                 curl = curl_init();
 596                 if (!curl)
 597                         return -EINVAL;
 598
 599                 if (!session->hosturl)
 600                         session->hosturl = strdup(twitter_host);
 601
 602                 switch (session->action) {
 603                 case ACTION_UPDATE:
 604                         snprintf(user_password, sizeof(user_password), "%s:%s",
 605                                  session->account, session->password);
 606                         snprintf(data, sizeof(data), "status=\"%s\"",
 607                                  session->tweet);
 608                         curl_formadd(&formpost, &lastptr,
 609                                      CURLFORM_COPYNAME, "status",
 610                                      CURLFORM_COPYCONTENTS, session->tweet,
 611                                      CURLFORM_END);
 612
 613                         curl_formadd(&formpost, &lastptr,
 614                                      CURLFORM_COPYNAME, "source",
 615                                      CURLFORM_COPYCONTENTS, "bti",
 616                                      CURLFORM_END);
 617
 618                         if (session->replyto)
 619                                 curl_formadd(&formpost, &lastptr,
 620                                              CURLFORM_COPYNAME, "in_reply_to_status_id",
 621                                              CURLFORM_COPYCONTENTS, session->replyto,
 622                                              CURLFORM_END);
 623
 624                         curl_easy_setopt(curl, CURLOPT_HTTPPOST, formpost);
 625                         slist = curl_slist_append(slist, "Expect:");
 626                         curl_easy_setopt(curl, CURLOPT_HTTPHEADER, slist);
 627
 628                         sprintf(endpoint, "%s%s", session->hosturl, update_uri);
 629                         curl_easy_setopt(curl, CURLOPT_URL, endpoint);
 630                         curl_easy_setopt(curl, CURLOPT_USERPWD, user_password);
 631                         break;
 632
 633                 case ACTION_FRIENDS:
 634                         snprintf(user_password, sizeof(user_password), "%s:%s",
 635                                  session->account, session->password);
 636                         sprintf(endpoint, "%s%s?page=%d", session->hosturl,
 637                                         friends_uri, session->page);
 638                         curl_easy_setopt(curl, CURLOPT_URL, endpoint);
 639                         curl_easy_setopt(curl, CURLOPT_USERPWD, user_password);
 640                         break;
 641
 642                 case ACTION_USER:
 643                         sprintf(endpoint, "%s%s%s.xml?page=%d", session->hosturl,
 644                                 user_uri, session->user, session->page);
 645                         curl_easy_setopt(curl, CURLOPT_URL, endpoint);
 646                         break;
 647
 648                 case ACTION_REPLIES:
 649                         snprintf(user_password, sizeof(user_password), "%s:%s",
 650                                  session->account, session->password);
 651                         sprintf(endpoint, "%s%s?page=%d", session->hosturl,
 652                                 replies_uri, session->page);
 653                         curl_easy_setopt(curl, CURLOPT_URL, endpoint);
 654                         curl_easy_setopt(curl, CURLOPT_USERPWD, user_password);
 655                         break;
 656
 657                 case ACTION_PUBLIC:
 658                         sprintf(endpoint, "%s%s?page=%d", session->hosturl,
 659                                 public_uri, session->page);
 660                         curl_easy_setopt(curl, CURLOPT_URL, endpoint);
 661                         break;
 662
 663                 case ACTION_GROUP:
 664                         sprintf(endpoint, "%s%s%s.xml?page=%d",
 665                                 session->hosturl, group_uri, session->group,
 666                                 session->page);
 667                         curl_easy_setopt(curl, CURLOPT_URL, endpoint);
 668                         break;
 669
 670                 default:
 671                         break;
 672                 }
 673
 674                 if (session->proxy)
 675                         curl_easy_setopt(curl, CURLOPT_PROXY, session->proxy);
 676
 677                 if (debug)
 678                         curl_easy_setopt(curl, CURLOPT_VERBOSE, 1);
 679
 680                 dbg("user_password = %s\n", user_password);
 681                 dbg("data = %s\n", data);
 682                 dbg("proxy = %s\n", session->proxy);
 683
 684                 curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, curl_callback);
 685                 curl_easy_setopt(curl, CURLOPT_WRITEDATA, curl_buf);
 686                 if (!session->dry_run) {
 687                         res = curl_easy_perform(curl);
 688                         if (res && !session->background) {
 689                                 fprintf(stderr, "error(%d) trying to perform "
 690                                                 "operation\n", res);
 691                                 return -EINVAL;
 692                         }
 693                 }
 694
 695                 curl_easy_cleanup(curl);
 696                 if (session->action == ACTION_UPDATE)
 697                         curl_formfree(formpost);
 698                 bti_curl_buffer_free(curl_buf);
 699         } else {
 700                 switch (session->action) {
 701                 case ACTION_UPDATE:
 702                         escaped_tweet = oauth_url_escape(session->tweet);
 703                         sprintf(endpoint, "%s%s?status=%s", session->hosturl,
 704                                 update_uri, escaped_tweet);
 705                         is_post = 1;
 706                         break;
 707                 case ACTION_USER:
 708                         sprintf(endpoint, "%s%s%s.xml?page=%d",
 709                                 session->hosturl, user_uri, session->user,
 710                                 session->page);
 711                         break;
 712                 case ACTION_REPLIES:
 713                         sprintf(endpoint, "%s%s?page=%d", session->hosturl,
 714                                 mentions_uri, session->page);
 715                         break;
 716                 case ACTION_PUBLIC:
 717                         sprintf(endpoint, "%s%s?page=%d", session->hosturl,
 718                                 public_uri, session->page);
 719                         break;
 720                 case ACTION_GROUP:
 721                         sprintf(endpoint, "%s%s%s.xml?page=%d",
 722                                 session->hosturl, group_uri, session->group,
 723                                 session->page);
 724                         break;
 725                 case ACTION_FRIENDS:
 726                         sprintf(endpoint, "%s%s?page=%d", session->hosturl,
 727                                 friends_uri, session->page);
 728                         break;
 729                 default:
 730                         break;
 731                 }
 732
 733                 if (is_post) {
 734                         req_url = oauth_sign_url2(endpoint, &postarg, OA_HMAC,
 735                                                   NULL, session->consumer_key,
 736                                                   session->consumer_secret,
 737                                                   session->access_token_key,
 738                                                   session->access_token_secret);
 739                         reply = oauth_http_post(req_url, postarg);
 740                 } else {
 741                         req_url = oauth_sign_url2(endpoint, NULL, OA_HMAC, NULL,
 742                                                   session->consumer_key,
 743                                                   session->consumer_secret,
 744                                                   session->access_token_key,
 745                                                   session->access_token_secret);
 746                         reply = oauth_http_get(req_url, postarg);
 747                 }
 748
 749                 dbg("%s\n", req_url);
 750                 dbg("%s\n", reply);
 751                 if (req_url)
 752                         free(req_url);
 753
 754                 if (session->action != ACTION_UPDATE)
 755                         parse_timeline(reply);
 756         }
 757         return 0;
 758 }
 759
 760 static void parse_configfile(struct session *session)
 761 {
 762         FILE *config_file;
 763         char *line = NULL;
 764         size_t len = 0;
 765         char *account = NULL;
 766         char *password = NULL;
 767         char *consumer_key = NULL;
 768         char *consumer_secret = NULL;
 769         char *access_token_key = NULL;
 770         char *access_token_secret = NULL;
 771         char *host = NULL;
 772         char *proxy = NULL;
 773         char *logfile = NULL;
 774         char *action = NULL;
 775         char *user = NULL;
 776         char *replyto = NULL;
 777         int shrink_urls = 0;
 778
 779         config_file = fopen(session->configfile, "r");
 780
 781         /* No error if file does not exist or is unreadable.  */
 782         if (config_file == NULL)
 783                 return;
 784
 785         do {
 786                 ssize_t n = getline(&line, &len, config_file);
 787                 if (n < 0)
 788                         break;
 789                 if (line[n - 1] == '\n')
 790                         line[n - 1] = '\0';
 791                 /* Parse file.  Format is the usual value pairs:
 792                    account=name
 793                    passwort=value
 794                    # is a comment character
 795                 */
 796                 *strchrnul(line, '#') = '\0';
 797                 char *c = line;
 798                 while (isspace(*c))
 799                         c++;
 800                 /* Ignore blank lines.  */
 801                 if (c[0] == '\0')
 802                         continue;
 803
 804                 if (!strncasecmp(c, "account", 7) && (c[7] == '=')) {
 805                         c += 8;
 806                         if (c[0] != '\0')
 807                                 account = strdup(c);
 808                 } else if (!strncasecmp(c, "password", 8) &&
 809                            (c[8] == '=')) {
 810                         c += 9;
 811                         if (c[0] != '\0')
 812                                 password = strdup(c);
 813                 } else if (!strncasecmp(c, "consumer_key", 12) &&
 814                            (c[12] == '=')) {
 815                         c += 13;
 816                         if (c[0] != '\0')
 817                                 consumer_key = strdup(c);
 818                 } else if (!strncasecmp(c, "consumer_secret", 15) &&
 819                            (c[15] == '=')) {
 820                         c += 16;
 821                         if (c[0] != '\0')
 822                                 consumer_secret = strdup(c);
 823                 } else if (!strncasecmp(c, "access_token_key", 16) &&
 824                            (c[16] == '=')) {
 825                         c += 17;
 826                         if (c[0] != '\0')
 827                                 access_token_key = strdup(c);
 828                 } else if (!strncasecmp(c, "access_token_secret", 19) &&
 829                            (c[19] == '=')) {
 830                         c += 20;
 831                         if (c[0] != '\0')
 832                                 access_token_secret = strdup(c);
 833                 } else if (!strncasecmp(c, "host", 4) &&
 834                            (c[4] == '=')) {
 835                         c += 5;
 836                         if (c[0] != '\0')
 837                                 host = strdup(c);
 838                 } else if (!strncasecmp(c, "proxy", 5) &&
 839                            (c[5] == '=')) {
 840                         c += 6;
 841                         if (c[0] != '\0')
 842                                 proxy = strdup(c);
 843                 } else if (!strncasecmp(c, "logfile", 7) &&
 844                            (c[7] == '=')) {
 845                         c += 8;
 846                         if (c[0] != '\0')
 847                                 logfile = strdup(c);
 848                 } else if (!strncasecmp(c, "replyto", 7) &&
 849                            (c[7] == '=')) {
 850                         c += 8;
 851                         if (c[0] != '\0')
 852                                 replyto = strdup(c);
 853                 } else if (!strncasecmp(c, "action", 6) &&
 854                            (c[6] == '=')) {
 855                         c += 7;
 856                         if (c[0] != '\0')
 857                                 action = strdup(c);
 858                 } else if (!strncasecmp(c, "user", 4) &&
 859                                 (c[4] == '=')) {
 860                         c += 5;
 861                         if (c[0] != '\0')
 862                                 user = strdup(c);
 863                 } else if (!strncasecmp(c, "shrink-urls", 11) &&
 864                                 (c[11] == '=')) {
 865                         c += 12;
 866                         if (!strncasecmp(c, "true", 4) ||
 867                                         !strncasecmp(c, "yes", 3))
 868                                 shrink_urls = 1;
 869                 } else if (!strncasecmp(c, "verbose", 7) &&
 870                                 (c[7] == '=')) {
 871                         c += 8;
 872                         if (!strncasecmp(c, "true", 4) ||
 873                                         !strncasecmp(c, "yes", 3))
 874                                 verbose = 1;
 875                 }
 876         } while (!feof(config_file));
 877
 878         if (password)
 879                 session->password = password;
 880         if (account)
 881                 session->account = account;
 882         if (consumer_key)
 883                 session->consumer_key = consumer_key;
 884         if (consumer_secret)
 885                 session->consumer_secret = consumer_secret;
 886         if (access_token_key)
 887                 session->access_token_key = access_token_key;
 888         if (access_token_secret)
 889                 session->access_token_secret = access_token_secret;
 890         if (host) {
 891                 if (strcasecmp(host, "twitter") == 0) {
 892                         session->host = HOST_TWITTER;
 893                         session->hosturl = strdup(twitter_host);
 894                         session->hostname = strdup(twitter_name);
 895                 } else if (strcasecmp(host, "identica") == 0) {
 896                         session->host = HOST_IDENTICA;
 897                         session->hosturl = strdup(identica_host);
 898                         session->hostname = strdup(identica_name);
 899                 } else {
 900                         session->host = HOST_CUSTOM;
 901                         session->hosturl = strdup(host);
 902                         session->hostname = strdup(host);
 903                 }
 904                 free(host);
 905         }
 906         if (proxy) {
 907                 if (session->proxy)
 908                         free(session->proxy);
 909                 session->proxy = proxy;
 910         }
 911         if (logfile)
 912                 session->logfile = logfile;
 913         if (replyto)
 914                 session->replyto = replyto;
 915         if (action) {
 916                 if (strcasecmp(action, "update") == 0)
 917                         session->action = ACTION_UPDATE;
 918                 else if (strcasecmp(action, "friends") == 0)
 919                         session->action = ACTION_FRIENDS;
 920                 else if (strcasecmp(action, "user") == 0)
 921                         session->action = ACTION_USER;
 922                 else if (strcasecmp(action, "replies") == 0)
 923                         session->action = ACTION_REPLIES;
 924                 else if (strcasecmp(action, "public") == 0)
 925                         session->action = ACTION_PUBLIC;
 926                 else if (strcasecmp(action, "group") == 0)
 927                         session->action = ACTION_GROUP;
 928                 else
 929                         session->action = ACTION_UNKNOWN;
 930                 free(action);
 931         }
 932         if (user)
 933                 session->user = user;
 934         session->shrink_urls = shrink_urls;
 935
 936         /* Free buffer and close file.  */
 937         free(line);
 938         fclose(config_file);
 939 }
 940
 941 static void log_session(struct session *session, int retval)
 942 {
 943         FILE *log_file;
 944         char *filename;
 945
 946         /* Only log something if we have a log file set */
 947         if (!session->logfile)
 948                 return;
 949
 950         filename = alloca(strlen(session->homedir) +
 951                           strlen(session->logfile) + 3);
 952
 953         sprintf(filename, "%s/%s", session->homedir, session->logfile);
 954
 955         log_file = fopen(filename, "a+");
 956         if (log_file == NULL)
 957                 return;
 958
 959         switch (session->action) {
 960         case ACTION_UPDATE:
 961                 if (retval)
 962                         fprintf(log_file, "%s: host=%s tweet failed\n",
 963                                 session->time, session->hostname);
 964                 else
 965                         fprintf(log_file, "%s: host=%s tweet=%s\n",
 966                                 session->time, session->hostname,
 967                                 session->tweet);
 968                 break;
 969         case ACTION_FRIENDS:
 970                 fprintf(log_file, "%s: host=%s retrieving friends timeline\n",
 971                         session->time, session->hostname);
 972                 break;
 973         case ACTION_USER:
 974                 fprintf(log_file, "%s: host=%s retrieving %s's timeline\n",
 975                         session->time, session->hostname, session->user);
 976                 break;
 977         case ACTION_REPLIES:
 978                 fprintf(log_file, "%s: host=%s retrieving replies\n",
 979                         session->time, session->hostname);
 980                 break;
 981         case ACTION_PUBLIC:
 982                 fprintf(log_file, "%s: host=%s retrieving public timeline\n",
 983                         session->time, session->hostname);
 984                 break;
 985         case ACTION_GROUP:
 986                 fprintf(log_file, "%s: host=%s retrieving group timeline\n",
 987                         session->time, session->hostname);
 988                 break;
 989         default:
 990                 break;
 991         }
 992
 993         fclose(log_file);
 994 }
 995
 996 static char *get_string_from_stdin(void)
 997 {
 998         char *temp;
 999         char *string;
1000
1001         string = zalloc(1000);
1002         if (!string)
1003                 return NULL;
1004
1005         if (!fgets(string, 999, stdin))
1006                 return NULL;
1007         temp = strchr(string, '\n');
1008         if (temp)
1009                 *temp = '\0';
1010         return string;
1011 }
1012
1013 static void read_password(char *buf, size_t len, char *host)
1014 {
1015         char pwd[80];
1016         int retval;
1017         struct termios old;
1018         struct termios tp;
1019
1020         tcgetattr(0, &tp);
1021         old = tp;
1022
1023         tp.c_lflag &= (~ECHO);
1024         tcsetattr(0, TCSANOW, &tp);
1025
1026         fprintf(stdout, "Enter password for %s: ", host);
1027         fflush(stdout);
1028         tcflow(0, TCOOFF);
1029         retval = scanf("%79s", pwd);
1030         tcflow(0, TCOON);
1031         fprintf(stdout, "\n");
1032
1033         tcsetattr(0, TCSANOW, &old);
1034
1035         strncpy(buf, pwd, len);
1036         buf[len-1] = '\0';
1037 }
1038
1039 static int find_urls(const char *tweet, int **pranges)
1040 {
1041         /*
1042          * magic obtained from
1043          * http://www.geekpedia.com/KB65_How-to-validate-an-URL-using-RegEx-in-Csharp.html
1044          */
1045         static const char *re_magic =
1046                 "(([a-zA-Z][0-9a-zA-Z+\\-\\.]*:)/{1,3}"
1047                 "[0-9a-zA-Z;/~?:@&=+$\\.\\-_'()%]+)"
1048                 "(#[0-9a-zA-Z;/?:@&=+$\\.\\-_!~*'()%]+)?";
1049         pcre *re;
1050         const char *errptr;
1051         int erroffset;
1052         int ovector[10] = {0,};
1053         const size_t ovsize = sizeof(ovector)/sizeof(*ovector);
1054         int startoffset, tweetlen;
1055         int i, rc;
1056         int rbound = 10;
1057         int rcount = 0;
1058         int *ranges = malloc(sizeof(int) * rbound);
1059
1060         re = pcre_compile(re_magic,
1061                         PCRE_NO_AUTO_CAPTURE,
1062                         &errptr, &erroffset, NULL);
1063         if (!re) {
1064                 fprintf(stderr, "pcre_compile @%u: %s\n", erroffset, errptr);
1065                 exit(1);
1066         }
1067
1068         tweetlen = strlen(tweet);
1069         for (startoffset = 0; startoffset < tweetlen; ) {
1070
1071                 rc = pcre_exec(re, NULL, tweet, strlen(tweet), startoffset, 0,
1072                                 ovector, ovsize);
1073                 if (rc == PCRE_ERROR_NOMATCH)
1074                         break;
1075
1076                 if (rc < 0) {
1077                         fprintf(stderr, "pcre_exec @%u: %s\n",
1078                                 erroffset, errptr);
1079                         exit(1);
1080                 }
1081
1082                 for (i = 0; i < rc; i += 2) {
1083                         if ((rcount+2) == rbound) {
1084                                 rbound *= 2;
1085                                 ranges = realloc(ranges, sizeof(int) * rbound);
1086                         }
1087
1088                         ranges[rcount++] = ovector[i];
1089                         ranges[rcount++] = ovector[i+1];
1090                 }
1091
1092                 startoffset = ovector[1];
1093         }
1094
1095         pcre_free(re);
1096
1097         *pranges = ranges;
1098         return rcount;
1099 }
1100
1101 /**
1102  * bidirectional popen() call
1103  *
1104  * @param rwepipe - int array of size three
1105  * @param exe - program to run
1106  * @param argv - argument list
1107  * @return pid or -1 on error
1108  *
1109  * The caller passes in an array of three integers (rwepipe), on successful
1110  * execution it can then write to element 0 (stdin of exe), and read from
1111  * element 1 (stdout) and 2 (stderr).
1112  */
1113 static int popenRWE(int *rwepipe, const char *exe, const char *const argv[])
1114 {
1115         int in[2];
1116         int out[2];
1117         int err[2];
1118         int pid;
1119         int rc;
1120
1121         rc = pipe(in);
1122         if (rc < 0)
1123                 goto error_in;
1124
1125         rc = pipe(out);
1126         if (rc < 0)
1127                 goto error_out;
1128
1129         rc = pipe(err);
1130         if (rc < 0)
1131                 goto error_err;
1132
1133         pid = fork();
1134         if (pid > 0) {
1135                 /* parent */
1136                 close(in[0]);
1137                 close(out[1]);
1138                 close(err[1]);
1139                 rwepipe[0] = in[1];
1140                 rwepipe[1] = out[0];
1141                 rwepipe[2] = err[0];
1142                 return pid;
1143         } else if (pid == 0) {
1144                 /* child */
1145                 close(in[1]);
1146                 close(out[0]);
1147                 close(err[0]);
1148                 close(0);
1149                 rc = dup(in[0]);
1150                 close(1);
1151                 rc = dup(out[1]);
1152                 close(2);
1153                 rc = dup(err[1]);
1154
1155                 execvp(exe, (char **)argv);
1156                 exit(1);
1157         } else
1158                 goto error_fork;
1159
1160         return pid;
1161
1162 error_fork:
1163         close(err[0]);
1164         close(err[1]);
1165 error_err:
1166         close(out[0]);
1167         close(out[1]);
1168 error_out:
1169         close(in[0]);
1170         close(in[1]);
1171 error_in:
1172         return -1;
1173 }
1174
1175 static int pcloseRWE(int pid, int *rwepipe)
1176 {
1177         int rc, status;
1178         close(rwepipe[0]);
1179         close(rwepipe[1]);
1180         close(rwepipe[2]);
1181         rc = waitpid(pid, &status, 0);
1182         return status;
1183 }
1184
1185 static char *shrink_one_url(int *rwepipe, char *big)
1186 {
1187         int biglen = strlen(big);
1188         char *small;
1189         int smalllen;
1190         int rc;
1191
1192         rc = dprintf(rwepipe[0], "%s\n", big);
1193         if (rc < 0)
1194                 return big;
1195
1196         smalllen = biglen + 128;
1197         small = malloc(smalllen);
1198         if (!small)
1199                 return big;
1200
1201         rc = read(rwepipe[1], small, smalllen);
1202         if (rc < 0 || rc > biglen)
1203                 goto error_free_small;
1204
1205         if (strncmp(small, "http://", 7))
1206                 goto error_free_small;
1207
1208         smalllen = rc;
1209         while (smalllen && isspace(small[smalllen-1]))
1210                         small[--smalllen] = 0;
1211
1212         free(big);
1213         return small;
1214
1215 error_free_small:
1216         free(small);
1217         return big;
1218 }
1219
1220 static char *shrink_urls(char *text)
1221 {
1222         int *ranges;
1223         int rcount;
1224         int i;
1225         int inofs = 0;
1226         int outofs = 0;
1227         const char *const shrink_args[] = {
1228                 "bti-shrink-urls",
1229                 NULL
1230         };
1231         int shrink_pid;
1232         int shrink_pipe[3];
1233         int inlen = strlen(text);
1234
1235         dbg("before len=%u\n", inlen);
1236
1237         shrink_pid = popenRWE(shrink_pipe, shrink_args[0], shrink_args);
1238         if (shrink_pid < 0)
1239                 return text;
1240
1241         rcount = find_urls(text, &ranges);
1242         if (!rcount)
1243                 return text;
1244
1245         for (i = 0; i < rcount; i += 2) {
1246                 int url_start = ranges[i];
1247                 int url_end = ranges[i+1];
1248                 int long_url_len = url_end - url_start;
1249                 char *url = strndup(text + url_start, long_url_len);
1250                 int short_url_len;
1251                 int not_url_len = url_start - inofs;
1252
1253                 dbg("long  url[%u]: %s\n", long_url_len, url);
1254                 url = shrink_one_url(shrink_pipe, url);
1255                 short_url_len = url ? strlen(url) : 0;
1256                 dbg("short url[%u]: %s\n", short_url_len, url);
1257
1258                 if (!url || short_url_len >= long_url_len) {
1259                         /* The short url ended up being too long
1260                          * or unavailable */
1261                         if (inofs) {
1262                                 strncpy(text + outofs, text + inofs,
1263                                                 not_url_len + long_url_len);
1264                         }
1265                         inofs += not_url_len + long_url_len;
1266                         outofs += not_url_len + long_url_len;
1267
1268                 } else {
1269                         /* copy the unmodified block */
1270                         strncpy(text + outofs, text + inofs, not_url_len);
1271                         inofs += not_url_len;
1272                         outofs += not_url_len;
1273
1274                         /* copy the new url */
1275                         strncpy(text + outofs, url, short_url_len);
1276                         inofs += long_url_len;
1277                         outofs += short_url_len;
1278                 }
1279
1280                 free(url);
1281         }
1282
1283         /* copy the last block after the last match */
1284         if (inofs) {
1285                 int tail = inlen - inofs;
1286                 if (tail) {
1287                         strncpy(text + outofs, text + inofs, tail);
1288                         outofs += tail;
1289                 }
1290         }
1291
1292         free(ranges);
1293
1294         (void)pcloseRWE(shrink_pid, shrink_pipe);
1295
1296         text[outofs] = 0;
1297         dbg("after len=%u\n", outofs);
1298         return text;
1299 }
1300
1301 int main(int argc, char *argv[], char *envp[])
1302 {
1303         static const struct option options[] = {
1304                 { "debug", 0, NULL, 'd' },
1305                 { "verbose", 0, NULL, 'V' },
1306                 { "account", 1, NULL, 'a' },
1307                 { "password", 1, NULL, 'p' },
1308                 { "host", 1, NULL, 'H' },
1309                 { "proxy", 1, NULL, 'P' },
1310                 { "action", 1, NULL, 'A' },
1311                 { "user", 1, NULL, 'u' },
1312                 { "group", 1, NULL, 'G' },
1313                 { "logfile", 1, NULL, 'L' },
1314                 { "shrink-urls", 0, NULL, 's' },
1315                 { "help", 0, NULL, 'h' },
1316                 { "bash", 0, NULL, 'b' },
1317                 { "background", 0, NULL, 'B' },
1318                 { "dry-run", 0, NULL, 'n' },
1319                 { "page", 1, NULL, 'g' },
1320                 { "version", 0, NULL, 'v' },
1321                 { "config", 1, NULL, 'c' },
1322                 { "replyto", 1, NULL, 'r' },
1323                 { }
1324         };
1325         struct session *session;
1326         pid_t child;
1327         char *tweet;
1328         static char password[80];
1329         int retval = 0;
1330         int option;
1331         char *http_proxy;
1332         time_t t;
1333         int page_nr;
1334
1335         debug = 0;
1336         verbose = 0;
1337
1338         session = session_alloc();
1339         if (!session) {
1340                 fprintf(stderr, "no more memory...\n");
1341                 return -1;
1342         }
1343
1344         /* get the current time so that we can log it later */
1345         time(&t);
1346         session->time = strdup(ctime(&t));
1347         session->time[strlen(session->time)-1] = 0x00;
1348
1349         /* Get the home directory so we can try to find a config file */
1350         session->homedir = strdup(getenv("HOME"));
1351
1352         /* set up a default config file location (traditionally ~/.bti) */
1353         session->configfile = zalloc(strlen(session->homedir) + 7);
1354         sprintf(session->configfile, "%s/.bti", session->homedir);
1355
1356         /* Set environment variables first, before reading command line options
1357          * or config file values. */
1358         http_proxy = getenv("http_proxy");
1359         if (http_proxy) {
1360                 if (session->proxy)
1361                         free(session->proxy);
1362                 session->proxy = strdup(http_proxy);
1363                 dbg("http_proxy = %s\n", session->proxy);
1364         }
1365
1366         parse_configfile(session);
1367
1368         while (1) {
1369                 option = getopt_long_only(argc, argv,
1370                                           "dp:P:H:a:A:u:c:hg:G:sr:nVv",
1371                                           options, NULL);
1372                 if (option == -1)
1373                         break;
1374                 switch (option) {
1375                 case 'd':
1376                         debug = 1;
1377                         break;
1378                 case 'V':
1379                         verbose = 1;
1380                         break;
1381                 case 'a':
1382                         if (session->account)
1383                                 free(session->account);
1384                         session->account = strdup(optarg);
1385                         dbg("account = %s\n", session->account);
1386                         break;
1387                 case 'g':
1388                         page_nr = atoi(optarg);
1389                         dbg("page = %d\n", page_nr);
1390                         session->page = page_nr;
1391                         break;
1392                 case 'r':
1393                         session->replyto = strdup(optarg);
1394                         dbg("in_reply_to_status_id = %s\n", session->replyto);
1395                         break;
1396                 case 'p':
1397                         if (session->password)
1398                                 free(session->password);
1399                         session->password = strdup(optarg);
1400                         dbg("password = %s\n", session->password);
1401                         break;
1402                 case 'P':
1403                         if (session->proxy)
1404                                 free(session->proxy);
1405                         session->proxy = strdup(optarg);
1406                         dbg("proxy = %s\n", session->proxy);
1407                         break;
1408                 case 'A':
1409                         if (strcasecmp(optarg, "update") == 0)
1410                                 session->action = ACTION_UPDATE;
1411                         else if (strcasecmp(optarg, "friends") == 0)
1412                                 session->action = ACTION_FRIENDS;
1413                         else if (strcasecmp(optarg, "user") == 0)
1414                                 session->action = ACTION_USER;
1415                         else if (strcasecmp(optarg, "replies") == 0)
1416                                 session->action = ACTION_REPLIES;
1417                         else if (strcasecmp(optarg, "public") == 0)
1418                                 session->action = ACTION_PUBLIC;
1419                         else if (strcasecmp(optarg, "group") == 0)
1420                                 session->action = ACTION_GROUP;
1421                         else
1422                                 session->action = ACTION_UNKNOWN;
1423                         dbg("action = %d\n", session->action);
1424                         break;
1425                 case 'u':
1426                         if (session->user)
1427                                 free(session->user);
1428                         session->user = strdup(optarg);
1429                         dbg("user = %s\n", session->user);
1430                         break;
1431
1432                 case 'G':
1433                         if (session->group)
1434                                 free(session->group);
1435                         session->group = strdup(optarg);
1436                         dbg("group = %s\n", session->group);
1437                         break;
1438                 case 'L':
1439                         if (session->logfile)
1440                                 free(session->logfile);
1441                         session->logfile = strdup(optarg);
1442                         dbg("logfile = %s\n", session->logfile);
1443                         break;
1444                 case 's':
1445                         session->shrink_urls = 1;
1446                         break;
1447                 case 'H':
1448                         if (session->hosturl)
1449                                 free(session->hosturl);
1450                         if (session->hostname)
1451                                 free(session->hostname);
1452                         if (strcasecmp(optarg, "twitter") == 0) {
1453                                 session->host = HOST_TWITTER;
1454                                 session->hosturl = strdup(twitter_host);
1455                                 session->hostname = strdup(twitter_name);
1456                         } else if (strcasecmp(optarg, "identica") == 0) {
1457                                 session->host = HOST_IDENTICA;
1458                                 session->hosturl = strdup(identica_host);
1459                                 session->hostname = strdup(identica_name);
1460                         } else {
1461                                 session->host = HOST_CUSTOM;
1462                                 session->hosturl = strdup(optarg);
1463                                 session->hostname = strdup(optarg);
1464                         }
1465                         dbg("host = %d\n", session->host);
1466                         break;
1467                 case 'b':
1468                         session->bash = 1;
1469                         /* fall-through intended */
1470                 case 'B':
1471                         session->background = 1;
1472                         break;
1473                 case 'c':
1474                         if (session->configfile)
1475                                 free(session->configfile);
1476                         session->configfile = strdup(optarg);
1477                         dbg("configfile = %s\n", session->configfile);
1478
1479                         /*
1480                          * read the config file now.  Yes, this could override
1481                          * previously set options from the command line, but
1482                          * the user asked for it...
1483                          */
1484                         parse_configfile(session);
1485                         break;
1486                 case 'h':
1487                         display_help();
1488                         goto exit;
1489                 case 'n':
1490                         session->dry_run = 1;
1491                         break;
1492                 case 'v':
1493                         display_version();
1494                         goto exit;
1495                 default:
1496                         display_help();
1497                         goto exit;
1498                 }
1499         }
1500
1501         session_readline_init(session);
1502         /*
1503          * Show the version to make it easier to determine what
1504          * is going on here
1505          */
1506         if (debug)
1507                 display_version();
1508
1509         if (session->host == HOST_TWITTER) {
1510                 if (!session->consumer_key || !session->consumer_secret) {
1511                         fprintf(stderr,
1512                                 "Twitter no longer supports HTTP basic authentication.\n"
1513                                 "Both consumer key, and consumer secret are required"
1514                                 " for bti in order to behave as an OAuth consumer.\n");
1515                         goto exit;
1516                 }
1517                 if (session->action == ACTION_GROUP) {
1518                         fprintf(stderr, "Groups only work in Identi.ca.\n");
1519                         goto exit;
1520                 }
1521         } else {
1522                 if (!session->consumer_key || !session->consumer_secret)
1523                         session->no_oauth = 1;
1524         }
1525
1526         if (session->no_oauth) {
1527                 if (!session->account) {
1528                         fprintf(stdout, "Enter account for %s: ",
1529                                 session->hostname);
1530                         session->account = session->readline(NULL);
1531                 }
1532                 if (!session->password) {
1533                         read_password(password, sizeof(password),
1534                                       session->hostname);
1535                         session->password = strdup(password);
1536                 }
1537         } else {
1538                 if (!session->access_token_key ||
1539                     !session->access_token_secret) {
1540                         request_access_token(session);
1541                         goto exit;
1542                 }
1543         }
1544
1545         if (session->action == ACTION_UNKNOWN) {
1546                 fprintf(stderr, "Unknown action, valid actions are:\n"
1547                         "'update', 'friends', 'public', 'replies', 'group' or 'user'.\n");
1548                 goto exit;
1549         }
1550
1551         if (session->action == ACTION_GROUP && !session->group) {
1552                 fprintf(stdout, "Enter group name: ");
1553                 session->group = session->readline(NULL);
1554         }
1555
1556         if (session->action == ACTION_UPDATE) {
1557                 if (session->background || !session->interactive)
1558                         tweet = get_string_from_stdin();
1559                 else
1560                         tweet = session->readline("tweet: ");
1561                 if (!tweet || strlen(tweet) == 0) {
1562                         dbg("no tweet?\n");
1563                         return -1;
1564                 }
1565
1566                 if (session->shrink_urls)
1567                         tweet = shrink_urls(tweet);
1568
1569                 session->tweet = zalloc(strlen(tweet) + 10);
1570                 if (session->bash)
1571                         sprintf(session->tweet, "%c %s",
1572                                 getuid() ? '$' : '#', tweet);
1573                 else
1574                         sprintf(session->tweet, "%s", tweet);
1575
1576                 free(tweet);
1577                 dbg("tweet = %s\n", session->tweet);
1578         }
1579
1580         if (session->page == 0)
1581                 session->page = 1;
1582         dbg("config file = %s\n", session->configfile);
1583         dbg("host = %d\n", session->host);
1584         dbg("action = %d\n", session->action);
1585
1586         /* fork ourself so that the main shell can get on
1587          * with it's life as we try to connect and handle everything
1588          */
1589         if (session->background) {
1590                 child = fork();
1591                 if (child) {
1592                         dbg("child is %d\n", child);
1593                         exit(0);
1594                 }
1595         }
1596
1597         retval = send_request(session);
1598         if (retval && !session->background)
1599                 fprintf(stderr, "operation failed\n");
1600
1601         log_session(session, retval);
1602 exit:
1603         session_readline_cleanup(session);
1604         session_free(session);
1605         return retval;;
1606 }