bti.c

   1 /*
   2  * Copyright (C) 2008 Greg Kroah-Hartman <greg@kroah.com>
   3  * Copyright (C) 2009 Bart Trojanowski <bart@jukie.net>
   4  * Copyright (C) 2009 Amir Mohammad Saied <amirsaied@gmail.com>
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License as published by the
   8  * Free Software Foundation version 2 of the License.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  18  */
  19
  20 #define _GNU_SOURCE
  21
  22 #include <stdio.h>
  23 #include <stdlib.h>
  24 #include <stddef.h>
  25 #include <string.h>
  26 #include <getopt.h>
  27 #include <errno.h>
  28 #include <ctype.h>
  29 #include <fcntl.h>
  30 #include <unistd.h>
  31 #include <time.h>
  32 #include <sys/stat.h>
  33 #include <sys/types.h>
  34 #include <sys/wait.h>
  35 #include <curl/curl.h>
  36 #include <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         fprintf(stdout, "Version: " VERSION "\n");
 115         fprintf(stdout, "Usage:\n");
 116         fprintf(stdout, "  bti [options]\n");
 117         fprintf(stdout, "options are:\n");
 118         fprintf(stdout, "  --account accountname\n");
 119         fprintf(stdout, "  --password password\n");
 120         fprintf(stdout, "  --action action\n");
 121         fprintf(stdout, "    ('update', 'friends', 'public', 'replies', "
 122                 "'group' or 'user')\n");
 123         fprintf(stdout, "  --user screenname\n");
 124         fprintf(stdout, "  --group groupname\n");
 125         fprintf(stdout, "  --proxy PROXY:PORT\n");
 126         fprintf(stdout, "  --host HOST\n");
 127         fprintf(stdout, "  --logfile logfile\n");
 128         fprintf(stdout, "  --config configfile\n");
 129         fprintf(stdout, "  --replyto ID\n");
 130         fprintf(stdout, "  --shrink-urls\n");
 131         fprintf(stdout, "  --page PAGENUMBER\n");
 132         fprintf(stdout, "  --bash\n");
 133         fprintf(stdout, "  --background\n");
 134         fprintf(stdout, "  --debug\n");
 135         fprintf(stdout, "  --verbose\n");
 136         fprintf(stdout, "  --dry-run\n");
 137         fprintf(stdout, "  --version\n");
 138         fprintf(stdout, "  --help\n");
 139 }
 140
 141 static void display_version(void)
 142 {
 143         fprintf(stdout, "bti - version %s\n", VERSION);
 144 }
 145
 146 static char *get_string(const char *name)
 147 {
 148         char *temp;
 149         char *string;
 150
 151         string = zalloc(1000);
 152         if (!string)
 153                 exit(1);
 154         if (name != NULL)
 155                 fprintf(stdout, "%s", name);
 156         if (!fgets(string, 999, stdin))
 157                 return NULL;
 158         temp = strchr(string, '\n');
 159         if (temp)
 160                 *temp = '\0';
 161         return string;
 162 }
 163
 164 /*
 165  * Try to get a handle to a readline function from a variety of different
 166  * libraries.  If nothing is present on the system, then fall back to an
 167  * internal one.
 168  *
 169  * Logic originally based off of code in the e2fsutils package in the
 170  * lib/ss/get_readline.c file, which is licensed under the MIT license.
 171  *
 172  * This keeps us from having to relicense the bti codebase if readline
 173  * ever changes its license, as there is no link-time dependancy.
 174  * It is a run-time thing only, and we handle any readline-like library
 175  * in the same manner, making bti not be a derivative work of any
 176  * other program.
 177  */
 178 static void session_readline_init(struct session *session)
 179 {
 180         /* Libraries we will try to use for readline/editline functionality */
 181         const char *libpath = "libreadline.so.6:libreadline.so.5:"
 182                                 "libreadline.so.4:libreadline.so:libedit.so.2:"
 183                                 "libedit.so:libeditline.so.0:libeditline.so";
 184         void *handle = NULL;
 185         char *tmp, *cp, *next;
 186         int (*bind_key)(int, void *);
 187         void (*insert)(void);
 188
 189         /* default to internal function if we can't or won't find anything */
 190         session->readline = get_string;
 191         if (!isatty(0))
 192                 return;
 193         session->interactive = 1;
 194
 195         tmp = malloc(strlen(libpath)+1);
 196         if (!tmp)
 197                 return;
 198         strcpy(tmp, libpath);
 199         for (cp = tmp; cp; cp = next) {
 200                 next = strchr(cp, ':');
 201                 if (next)
 202                         *next++ = 0;
 203                 if (*cp == 0)
 204                         continue;
 205                 handle = dlopen(cp, RTLD_NOW);
 206                 if (handle) {
 207                         dbg("Using %s for readline library\n", cp);
 208                         break;
 209                 }
 210         }
 211         free(tmp);
 212         if (!handle) {
 213                 dbg("No readline library found.\n");
 214                 return;
 215         }
 216
 217         session->readline_handle = handle;
 218         session->readline = (char *(*)(const char *))dlsym(handle, "readline");
 219         if (session->readline == NULL) {
 220                 /* something odd happened, default back to internal stuff */
 221                 session->readline_handle = NULL;
 222                 session->readline = get_string;
 223                 return;
 224         }
 225
 226         /*
 227          * If we found a library, turn off filename expansion
 228          * as that makes no sense from within bti.
 229          */
 230         bind_key = (int (*)(int, void *))dlsym(handle, "rl_bind_key");
 231         insert = (void (*)(void))dlsym(handle, "rl_insert");
 232         if (bind_key && insert)
 233                 bind_key('\t', insert);
 234 }
 235
 236 static void session_readline_cleanup(struct session *session)
 237 {
 238         if (session->readline_handle)
 239                 dlclose(session->readline_handle);
 240 }
 241
 242 static struct session *session_alloc(void)
 243 {
 244         struct session *session;
 245
 246         session = zalloc(sizeof(*session));
 247         if (!session)
 248                 return NULL;
 249         return session;
 250 }
 251
 252 static void session_free(struct session *session)
 253 {
 254         if (!session)
 255                 return;
 256         free(session->replyto);
 257         free(session->password);
 258         free(session->account);
 259         free(session->consumer_key);
 260         free(session->consumer_secret);
 261         free(session->access_token_key);
 262         free(session->access_token_secret);
 263         free(session->tweet);
 264         free(session->proxy);
 265         free(session->time);
 266         free(session->homedir);
 267         free(session->user);
 268         free(session->group);
 269         free(session->hosturl);
 270         free(session->hostname);
 271         free(session->configfile);
 272         free(session);
 273 }
 274
 275 static struct bti_curl_buffer *bti_curl_buffer_alloc(enum action action)
 276 {
 277         struct bti_curl_buffer *buffer;
 278
 279         buffer = zalloc(sizeof(*buffer));
 280         if (!buffer)
 281                 return NULL;
 282
 283         /* start out with a data buffer of 1 byte to
 284          * make the buffer fill logic simpler */
 285         buffer->data = zalloc(1);
 286         if (!buffer->data) {
 287                 free(buffer);
 288                 return NULL;
 289         }
 290         buffer->length = 0;
 291         buffer->action = action;
 292         return buffer;
 293 }
 294
 295 static void bti_curl_buffer_free(struct bti_curl_buffer *buffer)
 296 {
 297         if (!buffer)
 298                 return;
 299         free(buffer->data);
 300         free(buffer);
 301 }
 302
 303 static const char twitter_host[]  = "http://api.twitter.com/1/statuses";
 304 static const char identica_host[] = "https://identi.ca/api/statuses";
 305 static const char twitter_name[]  = "twitter";
 306 static const char identica_name[] = "identi.ca";
 307
 308 static const char twitter_request_token_uri[]  = "http://twitter.com/oauth/request_token";
 309 static const char twitter_access_token_uri[]   = "http://twitter.com/oauth/access_token";
 310 static const char twitter_authorize_uri[]      = "http://twitter.com/oauth/authorize?oauth_token=";
 311 static const char identica_request_token_uri[] = "http://identi.ca/api/oauth/request_token";
 312 static const char identica_access_token_uri[]  = "http://identi.ca/api/oauth/access_token";
 313 static const char identica_authorize_uri[]     = "http://identi.ca/api/oauth/authorize?oauth_token=";
 314
 315 static const char user_uri[]     = "/user_timeline/";
 316 static const char update_uri[]   = "/update.xml";
 317 static const char public_uri[]   = "/public_timeline.xml";
 318 static const char friends_uri[]  = "/friends_timeline.xml";
 319 static const char mentions_uri[] = "/mentions.xml";
 320 static const char replies_uri[]  = "/replies.xml";
 321 static const char group_uri[]    = "/../statusnet/groups/timeline/";
 322
 323 static CURL *curl_init(void)
 324 {
 325         CURL *curl;
 326
 327         curl = curl_easy_init();
 328         if (!curl) {
 329                 fprintf(stderr, "Can not init CURL!\n");
 330                 return NULL;
 331         }
 332         /* some ssl sanity checks on the connection we are making */
 333         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0);
 334         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0);
 335         return curl;
 336 }
 337
 338 static void parse_statuses(xmlDocPtr doc, xmlNodePtr current)
 339 {
 340         xmlChar *text = NULL;
 341         xmlChar *user = NULL;
 342         xmlChar *created = NULL;
 343         xmlChar *id = NULL;
 344         xmlNodePtr userinfo;
 345
 346         current = current->xmlChildrenNode;
 347         while (current != NULL) {
 348                 if (current->type == XML_ELEMENT_NODE) {
 349                         if (!xmlStrcmp(current->name, (const xmlChar *)"created_at"))
 350                                 created = xmlNodeListGetString(doc, current->xmlChildrenNode, 1);
 351                         if (!xmlStrcmp(current->name, (const xmlChar *)"text"))
 352                                 text = xmlNodeListGetString(doc, current->xmlChildrenNode, 1);
 353                         if (!xmlStrcmp(current->name, (const xmlChar *)"id"))
 354                                 id = xmlNodeListGetString(doc, current->xmlChildrenNode, 1);
 355                         if (!xmlStrcmp(current->name, (const xmlChar *)"user")) {
 356                                 userinfo = current->xmlChildrenNode;
 357                                 while (userinfo != NULL) {
 358                                         if ((!xmlStrcmp(userinfo->name, (const xmlChar *)"screen_name"))) {
 359                                                 if (user)
 360                                                         xmlFree(user);
 361                                                 user = xmlNodeListGetString(doc, userinfo->xmlChildrenNode, 1);
 362                                         }
 363                                         userinfo = userinfo->next;
 364                                 }
 365                         }
 366
 367                         if (user && text && created && id) {
 368                                 if (verbose)
 369                                         printf("[%s] {%s} (%.16s) %s\n",
 370                                                 user, id, created, text);
 371                                 else
 372                                         printf("[%s] %s\n",
 373                                                 user, text);
 374                                 xmlFree(user);
 375                                 xmlFree(text);
 376                                 xmlFree(created);
 377                                 xmlFree(id);
 378                                 user = NULL;
 379                                 text = NULL;
 380                                 created = NULL;
 381                                 id = NULL;
 382                         }
 383                 }
 384                 current = current->next;
 385         }
 386
 387         return;
 388 }
 389
 390 static void parse_timeline(char *document)
 391 {
 392         xmlDocPtr doc;
 393         xmlNodePtr current;
 394
 395         doc = xmlReadMemory(document, strlen(document), "timeline.xml",
 396                             NULL, XML_PARSE_NOERROR);
 397         if (doc == NULL)
 398                 return;
 399
 400         current = xmlDocGetRootElement(doc);
 401         if (current == NULL) {
 402                 fprintf(stderr, "empty document\n");
 403                 xmlFreeDoc(doc);
 404                 return;
 405         }
 406
 407         if (xmlStrcmp(current->name, (const xmlChar *) "statuses")) {
 408                 fprintf(stderr, "unexpected document type\n");
 409                 xmlFreeDoc(doc);
 410                 return;
 411         }
 412
 413         current = current->xmlChildrenNode;
 414         while (current != NULL) {
 415                 if ((!xmlStrcmp(current->name, (const xmlChar *)"status")))
 416                         parse_statuses(doc, current);
 417                 current = current->next;
 418         }
 419         xmlFreeDoc(doc);
 420
 421         return;
 422 }
 423
 424 static size_t curl_callback(void *buffer, size_t size, size_t nmemb,
 425                             void *userp)
 426 {
 427         struct bti_curl_buffer *curl_buf = userp;
 428         size_t buffer_size = size * nmemb;
 429         char *temp;
 430
 431         if ((!buffer) || (!buffer_size) || (!curl_buf))
 432                 return -EINVAL;
 433
 434         /* add to the data we already have */
 435         temp = zalloc(curl_buf->length + buffer_size + 1);
 436         if (!temp)
 437                 return -ENOMEM;
 438
 439         memcpy(temp, curl_buf->data, curl_buf->length);
 440         free(curl_buf->data);
 441         curl_buf->data = temp;
 442         memcpy(&curl_buf->data[curl_buf->length], (char *)buffer, buffer_size);
 443         curl_buf->length += buffer_size;
 444         if (curl_buf->action)
 445                 parse_timeline(curl_buf->data);
 446
 447         dbg("%s\n", curl_buf->data);
 448
 449         return buffer_size;
 450 }
 451
 452 static int parse_osp_reply(const char *reply, char **token, char **secret)
 453 {
 454         int rc;
 455         int retval = 1;
 456         char **rv = NULL;
 457         rc = oauth_split_url_parameters(reply, &rv);
 458         qsort(rv, rc, sizeof(char *), oauth_cmpstringp);
 459         if (rc == 2 || rc == 4) {
 460                 if (!strncmp(rv[0], "oauth_token=", 11) &&
 461                     !strncmp(rv[1], "oauth_token_secret=", 18)) {
 462                         if (token)
 463                                 *token = strdup(&(rv[0][12]));
 464                         if (secret)
 465                                 *secret = strdup(&(rv[1][19]));
 466
 467                         retval = 0;
 468                 }
 469         } else if (rc == 3) {
 470                 if (!strncmp(rv[1], "oauth_token=", 11) &&
 471                     !strncmp(rv[2], "oauth_token_secret=", 18)) {
 472                         if (token)
 473                                 *token = strdup(&(rv[1][12]));
 474                         if (secret)
 475                                 *secret = strdup(&(rv[2][19]));
 476
 477                         retval = 0;
 478                 }
 479         }
 480
 481         dbg("token: %s\n", *token);
 482         dbg("secret: %s\n", *secret);
 483
 484         if (rv)
 485                 free(rv);
 486
 487         return retval;
 488 }
 489
 490 static int request_access_token(struct session *session)
 491 {
 492         char *post_params = NULL;
 493         char *request_url = NULL;
 494         char *reply    = NULL;
 495         char *at_key      = NULL;
 496         char *at_secret   = NULL;
 497         char *verifier    = NULL;
 498         char at_uri[90];
 499
 500         if (!session)
 501                 return -EINVAL;
 502
 503         if (session->host == HOST_TWITTER)
 504                 request_url = oauth_sign_url2(
 505                                 twitter_request_token_uri, NULL,
 506                                 OA_HMAC, NULL, session->consumer_key,
 507                                 session->consumer_secret, NULL, NULL);
 508         else if (session->host == HOST_IDENTICA)
 509                 request_url = oauth_sign_url2(
 510                                 identica_request_token_uri, NULL,
 511                                 OA_HMAC, NULL, session->consumer_key,
 512                                 session->consumer_secret, NULL, NULL);
 513         reply = oauth_http_get(request_url, post_params);
 514
 515         if (request_url)
 516                 free(request_url);
 517
 518         if (post_params)
 519                 free(post_params);
 520
 521         if (!reply)
 522                 return 1;
 523
 524         if (parse_osp_reply(reply, &at_key, &at_secret))
 525                 return 1;
 526
 527         free(reply);
 528
 529         fprintf(stdout,
 530                 "Please open the following link in your browser, and "
 531                 "allow 'bti' to access your account. Then paste "
 532                 "back the provided PIN in here.\n");
 533         if (session->host == HOST_TWITTER) {
 534                 fprintf(stdout, "%s%s\nPIN: ", twitter_authorize_uri, at_key);
 535                 verifier = session->readline(NULL);
 536                 sprintf(at_uri, "%s?oauth_verifier=%s",
 537                         twitter_access_token_uri, verifier);
 538         } else if (session->host == HOST_IDENTICA) {
 539                 fprintf(stdout, "%s%s\nPIN: ", identica_authorize_uri, at_key);
 540                 verifier = session->readline(NULL);
 541                 sprintf(at_uri, "%s?oauth_verifier=%s",
 542                         identica_access_token_uri, verifier);
 543         }
 544         request_url = oauth_sign_url2(at_uri, NULL, OA_HMAC, NULL,
 545                                       session->consumer_key,
 546                                       session->consumer_secret,
 547                                       at_key, at_secret);
 548         reply = oauth_http_get(request_url, post_params);
 549
 550         if (!reply)
 551                 return 1;
 552
 553         if (parse_osp_reply(reply, &at_key, &at_secret))
 554                 return 1;
 555
 556         free(reply);
 557
 558         fprintf(stdout,
 559                 "Please put these two lines in your bti "
 560                 "configuration file (~/.bti):\n"
 561                 "access_token_key=%s\n"
 562                 "access_token_secret=%s\n",
 563                 at_key, at_secret);
 564
 565         return 0;
 566 }
 567
 568 static int send_request(struct session *session)
 569 {
 570         char endpoint[500];
 571         char user_password[500];
 572         char data[500];
 573         struct bti_curl_buffer *curl_buf;
 574         CURL *curl = NULL;
 575         CURLcode res;
 576         struct curl_httppost *formpost = NULL;
 577         struct curl_httppost *lastptr = NULL;
 578         struct curl_slist *slist = NULL;
 579         char *req_url = NULL;
 580         char *reply = NULL;
 581         char *postarg = NULL;
 582         char *escaped_tweet = NULL;
 583         int is_post = 0;
 584
 585         if (!session)
 586                 return -EINVAL;
 587
 588         if (!session->hosturl)
 589                 session->hosturl = strdup(twitter_host);
 590
 591         if (session->no_oauth) {
 592                 curl_buf = bti_curl_buffer_alloc(session->action);
 593                 if (!curl_buf)
 594                         return -ENOMEM;
 595
 596                 curl = curl_init();
 597                 if (!curl)
 598                         return -EINVAL;
 599
 600                 if (!session->hosturl)
 601                         session->hosturl = strdup(twitter_host);
 602
 603                 switch (session->action) {
 604                 case ACTION_UPDATE:
 605                         snprintf(user_password, sizeof(user_password), "%s:%s",
 606                                  session->account, session->password);
 607                         snprintf(data, sizeof(data), "status=\"%s\"",
 608                                  session->tweet);
 609                         curl_formadd(&formpost, &lastptr,
 610                                      CURLFORM_COPYNAME, "status",
 611                                      CURLFORM_COPYCONTENTS, session->tweet,
 612                                      CURLFORM_END);
 613
 614                         curl_formadd(&formpost, &lastptr,
 615                                      CURLFORM_COPYNAME, "source",
 616                                      CURLFORM_COPYCONTENTS, "bti",
 617                                      CURLFORM_END);
 618
 619                         if (session->replyto)
 620                                 curl_formadd(&formpost, &lastptr,
 621                                              CURLFORM_COPYNAME, "in_reply_to_status_id",
 622                                              CURLFORM_COPYCONTENTS, session->replyto,
 623                                              CURLFORM_END);
 624
 625                         curl_easy_setopt(curl, CURLOPT_HTTPPOST, formpost);
 626                         slist = curl_slist_append(slist, "Expect:");
 627                         curl_easy_setopt(curl, CURLOPT_HTTPHEADER, slist);
 628
 629                         sprintf(endpoint, "%s%s", session->hosturl, update_uri);
 630                         curl_easy_setopt(curl, CURLOPT_URL, endpoint);
 631                         curl_easy_setopt(curl, CURLOPT_USERPWD, user_password);
 632                         break;
 633
 634                 case ACTION_FRIENDS:
 635                         snprintf(user_password, sizeof(user_password), "%s:%s",
 636                                  session->account, session->password);
 637                         sprintf(endpoint, "%s%s?page=%d", session->hosturl,
 638                                         friends_uri, session->page);
 639                         curl_easy_setopt(curl, CURLOPT_URL, endpoint);
 640                         curl_easy_setopt(curl, CURLOPT_USERPWD, user_password);
 641                         break;
 642
 643                 case ACTION_USER:
 644                         sprintf(endpoint, "%s%s%s.xml?page=%d", session->hosturl,
 645                                 user_uri, session->user, session->page);
 646                         curl_easy_setopt(curl, CURLOPT_URL, endpoint);
 647                         break;
 648
 649                 case ACTION_REPLIES:
 650                         snprintf(user_password, sizeof(user_password), "%s:%s",
 651                                  session->account, session->password);
 652                         sprintf(endpoint, "%s%s?page=%d", session->hosturl,
 653                                 replies_uri, session->page);
 654                         curl_easy_setopt(curl, CURLOPT_URL, endpoint);
 655                         curl_easy_setopt(curl, CURLOPT_USERPWD, user_password);
 656                         break;
 657
 658                 case ACTION_PUBLIC:
 659                         sprintf(endpoint, "%s%s?page=%d", session->hosturl,
 660                                 public_uri, session->page);
 661                         curl_easy_setopt(curl, CURLOPT_URL, endpoint);
 662                         break;
 663
 664                 case ACTION_GROUP:
 665                         sprintf(endpoint, "%s%s%s.xml?page=%d",
 666                                 session->hosturl, group_uri, session->group,
 667                                 session->page);
 668                         curl_easy_setopt(curl, CURLOPT_URL, endpoint);
 669                         break;
 670
 671                 default:
 672                         break;
 673                 }
 674
 675                 if (session->proxy)
 676                         curl_easy_setopt(curl, CURLOPT_PROXY, session->proxy);
 677
 678                 if (debug)
 679                         curl_easy_setopt(curl, CURLOPT_VERBOSE, 1);
 680
 681                 dbg("user_password = %s\n", user_password);
 682                 dbg("data = %s\n", data);
 683                 dbg("proxy = %s\n", session->proxy);
 684
 685                 curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, curl_callback);
 686                 curl_easy_setopt(curl, CURLOPT_WRITEDATA, curl_buf);
 687                 if (!session->dry_run) {
 688                         res = curl_easy_perform(curl);
 689                         if (res && !session->background) {
 690                                 fprintf(stderr, "error(%d) trying to perform "
 691                                                 "operation\n", res);
 692                                 return -EINVAL;
 693                         }
 694                 }
 695
 696                 curl_easy_cleanup(curl);
 697                 if (session->action == ACTION_UPDATE)
 698                         curl_formfree(formpost);
 699                 bti_curl_buffer_free(curl_buf);
 700         } else {
 701                 switch (session->action) {
 702                 case ACTION_UPDATE:
 703                         escaped_tweet = oauth_url_escape(session->tweet);
 704                         sprintf(endpoint, "%s%s?status=%s", session->hosturl,
 705                                 update_uri, escaped_tweet);
 706                         is_post = 1;
 707                         break;
 708                 case ACTION_USER:
 709                         sprintf(endpoint, "%s%s%s.xml?page=%d",
 710                                 session->hosturl, user_uri, session->user,
 711                                 session->page);
 712                         break;
 713                 case ACTION_REPLIES:
 714                         sprintf(endpoint, "%s%s?page=%d", session->hosturl,
 715                                 mentions_uri, session->page);
 716                         break;
 717                 case ACTION_PUBLIC:
 718                         sprintf(endpoint, "%s%s?page=%d", session->hosturl,
 719                                 public_uri, session->page);
 720                         break;
 721                 case ACTION_GROUP:
 722                         sprintf(endpoint, "%s%s%s.xml?page=%d",
 723                                 session->hosturl, group_uri, session->group,
 724                                 session->page);
 725                         break;
 726                 case ACTION_FRIENDS:
 727                         sprintf(endpoint, "%s%s?page=%d", session->hosturl,
 728                                 friends_uri, session->page);
 729                         break;
 730                 default:
 731                         break;
 732                 }
 733
 734                 if (is_post) {
 735                         req_url = oauth_sign_url2(endpoint, &postarg, OA_HMAC,
 736                                                   NULL, session->consumer_key,
 737                                                   session->consumer_secret,
 738                                                   session->access_token_key,
 739                                                   session->access_token_secret);
 740                         reply = oauth_http_post(req_url, postarg);
 741                 } else {
 742                         req_url = oauth_sign_url2(endpoint, NULL, OA_HMAC, NULL,
 743                                                   session->consumer_key,
 744                                                   session->consumer_secret,
 745                                                   session->access_token_key,
 746                                                   session->access_token_secret);
 747                         reply = oauth_http_get(req_url, postarg);
 748                 }
 749
 750                 dbg("%s\n", req_url);
 751                 dbg("%s\n", reply);
 752                 if (req_url)
 753                         free(req_url);
 754
 755                 if (session->action != ACTION_UPDATE)
 756                         parse_timeline(reply);
 757         }
 758         return 0;
 759 }
 760
 761 static void parse_configfile(struct session *session)
 762 {
 763         FILE *config_file;
 764         char *line = NULL;
 765         size_t len = 0;
 766         char *account = NULL;
 767         char *password = NULL;
 768         char *consumer_key = NULL;
 769         char *consumer_secret = NULL;
 770         char *access_token_key = NULL;
 771         char *access_token_secret = NULL;
 772         char *host = NULL;
 773         char *proxy = NULL;
 774         char *logfile = NULL;
 775         char *action = NULL;
 776         char *user = NULL;
 777         char *replyto = NULL;
 778         int shrink_urls = 0;
 779
 780         config_file = fopen(session->configfile, "r");
 781
 782         /* No error if file does not exist or is unreadable.  */
 783         if (config_file == NULL)
 784                 return;
 785
 786         do {
 787                 ssize_t n = getline(&line, &len, config_file);
 788                 if (n < 0)
 789                         break;
 790                 if (line[n - 1] == '\n')
 791                         line[n - 1] = '\0';
 792                 /* Parse file.  Format is the usual value pairs:
 793                    account=name
 794                    passwort=value
 795                    # is a comment character
 796                 */
 797                 *strchrnul(line, '#') = '\0';
 798                 char *c = line;
 799                 while (isspace(*c))
 800                         c++;
 801                 /* Ignore blank lines.  */
 802                 if (c[0] == '\0')
 803                         continue;
 804
 805                 if (!strncasecmp(c, "account", 7) && (c[7] == '=')) {
 806                         c += 8;
 807                         if (c[0] != '\0')
 808                                 account = strdup(c);
 809                 } else if (!strncasecmp(c, "password", 8) &&
 810                            (c[8] == '=')) {
 811                         c += 9;
 812                         if (c[0] != '\0')
 813                                 password = strdup(c);
 814                 } else if (!strncasecmp(c, "consumer_key", 12) &&
 815                            (c[12] == '=')) {
 816                         c += 13;
 817                         if (c[0] != '\0')
 818                                 consumer_key = strdup(c);
 819                 } else if (!strncasecmp(c, "consumer_secret", 15) &&
 820                            (c[15] == '=')) {
 821                         c += 16;
 822                         if (c[0] != '\0')
 823                                 consumer_secret = strdup(c);
 824                 } else if (!strncasecmp(c, "access_token_key", 16) &&
 825                            (c[16] == '=')) {
 826                         c += 17;
 827                         if (c[0] != '\0')
 828                                 access_token_key = strdup(c);
 829                 } else if (!strncasecmp(c, "access_token_secret", 19) &&
 830                            (c[19] == '=')) {
 831                         c += 20;
 832                         if (c[0] != '\0')
 833                                 access_token_secret = strdup(c);
 834                 } else if (!strncasecmp(c, "host", 4) &&
 835                            (c[4] == '=')) {
 836                         c += 5;
 837                         if (c[0] != '\0')
 838                                 host = strdup(c);
 839                 } else if (!strncasecmp(c, "proxy", 5) &&
 840                            (c[5] == '=')) {
 841                         c += 6;
 842                         if (c[0] != '\0')
 843                                 proxy = strdup(c);
 844                 } else if (!strncasecmp(c, "logfile", 7) &&
 845                            (c[7] == '=')) {
 846                         c += 8;
 847                         if (c[0] != '\0')
 848                                 logfile = strdup(c);
 849                 } else if (!strncasecmp(c, "replyto", 7) &&
 850                            (c[7] == '=')) {
 851                         c += 8;
 852                         if (c[0] != '\0')
 853                                 replyto = strdup(c);
 854                 } else if (!strncasecmp(c, "action", 6) &&
 855                            (c[6] == '=')) {
 856                         c += 7;
 857                         if (c[0] != '\0')
 858                                 action = strdup(c);
 859                 } else if (!strncasecmp(c, "user", 4) &&
 860                                 (c[4] == '=')) {
 861                         c += 5;
 862                         if (c[0] != '\0')
 863                                 user = strdup(c);
 864                 } else if (!strncasecmp(c, "shrink-urls", 11) &&
 865                                 (c[11] == '=')) {
 866                         c += 12;
 867                         if (!strncasecmp(c, "true", 4) ||
 868                                         !strncasecmp(c, "yes", 3))
 869                                 shrink_urls = 1;
 870                 } else if (!strncasecmp(c, "verbose", 7) &&
 871                                 (c[7] == '=')) {
 872                         c += 8;
 873                         if (!strncasecmp(c, "true", 4) ||
 874                                         !strncasecmp(c, "yes", 3))
 875                                 verbose = 1;
 876                 }
 877         } while (!feof(config_file));
 878
 879         if (password)
 880                 session->password = password;
 881         if (account)
 882                 session->account = account;
 883         if (consumer_key)
 884                 session->consumer_key = consumer_key;
 885         if (consumer_secret)
 886                 session->consumer_secret = consumer_secret;
 887         if (access_token_key)
 888                 session->access_token_key = access_token_key;
 889         if (access_token_secret)
 890                 session->access_token_secret = access_token_secret;
 891         if (host) {
 892                 if (strcasecmp(host, "twitter") == 0) {
 893                         session->host = HOST_TWITTER;
 894                         session->hosturl = strdup(twitter_host);
 895                         session->hostname = strdup(twitter_name);
 896                 } else if (strcasecmp(host, "identica") == 0) {
 897                         session->host = HOST_IDENTICA;
 898                         session->hosturl = strdup(identica_host);
 899                         session->hostname = strdup(identica_name);
 900                 } else {
 901                         session->host = HOST_CUSTOM;
 902                         session->hosturl = strdup(host);
 903                         session->hostname = strdup(host);
 904                 }
 905                 free(host);
 906         }
 907         if (proxy) {
 908                 if (session->proxy)
 909                         free(session->proxy);
 910                 session->proxy = proxy;
 911         }
 912         if (logfile)
 913                 session->logfile = logfile;
 914         if (replyto)
 915                 session->replyto = replyto;
 916         if (action) {
 917                 if (strcasecmp(action, "update") == 0)
 918                         session->action = ACTION_UPDATE;
 919                 else if (strcasecmp(action, "friends") == 0)
 920                         session->action = ACTION_FRIENDS;
 921                 else if (strcasecmp(action, "user") == 0)
 922                         session->action = ACTION_USER;
 923                 else if (strcasecmp(action, "replies") == 0)
 924                         session->action = ACTION_REPLIES;
 925                 else if (strcasecmp(action, "public") == 0)
 926                         session->action = ACTION_PUBLIC;
 927                 else if (strcasecmp(action, "group") == 0)
 928                         session->action = ACTION_GROUP;
 929                 else
 930                         session->action = ACTION_UNKNOWN;
 931                 free(action);
 932         }
 933         if (user)
 934                 session->user = user;
 935         session->shrink_urls = shrink_urls;
 936
 937         /* Free buffer and close file.  */
 938         free(line);
 939         fclose(config_file);
 940 }
 941
 942 static void log_session(struct session *session, int retval)
 943 {
 944         FILE *log_file;
 945         char *filename;
 946
 947         /* Only log something if we have a log file set */
 948         if (!session->logfile)
 949                 return;
 950
 951         filename = alloca(strlen(session->homedir) +
 952                           strlen(session->logfile) + 3);
 953
 954         sprintf(filename, "%s/%s", session->homedir, session->logfile);
 955
 956         log_file = fopen(filename, "a+");
 957         if (log_file == NULL)
 958                 return;
 959
 960         switch (session->action) {
 961         case ACTION_UPDATE:
 962                 if (retval)
 963                         fprintf(log_file, "%s: host=%s tweet failed\n",
 964                                 session->time, session->hostname);
 965                 else
 966                         fprintf(log_file, "%s: host=%s tweet=%s\n",
 967                                 session->time, session->hostname,
 968                                 session->tweet);
 969                 break;
 970         case ACTION_FRIENDS:
 971                 fprintf(log_file, "%s: host=%s retrieving friends timeline\n",
 972                         session->time, session->hostname);
 973                 break;
 974         case ACTION_USER:
 975                 fprintf(log_file, "%s: host=%s retrieving %s's timeline\n",
 976                         session->time, session->hostname, session->user);
 977                 break;
 978         case ACTION_REPLIES:
 979                 fprintf(log_file, "%s: host=%s retrieving replies\n",
 980                         session->time, session->hostname);
 981                 break;
 982         case ACTION_PUBLIC:
 983                 fprintf(log_file, "%s: host=%s retrieving public timeline\n",
 984                         session->time, session->hostname);
 985                 break;
 986         case ACTION_GROUP:
 987                 fprintf(log_file, "%s: host=%s retrieving group timeline\n",
 988                         session->time, session->hostname);
 989                 break;
 990         default:
 991                 break;
 992         }
 993
 994         fclose(log_file);
 995 }
 996
 997 static char *get_string_from_stdin(void)
 998 {
 999         char *temp;
1000         char *string;
1001
1002         string = zalloc(1000);
1003         if (!string)
1004                 return NULL;
1005
1006         if (!fgets(string, 999, stdin))
1007                 return NULL;
1008         temp = strchr(string, '\n');
1009         if (temp)
1010                 *temp = '\0';
1011         return string;
1012 }
1013
1014 static void read_password(char *buf, size_t len, char *host)
1015 {
1016         char pwd[80];
1017         int retval;
1018         struct termios old;
1019         struct termios tp;
1020
1021         tcgetattr(0, &tp);
1022         old = tp;
1023
1024         tp.c_lflag &= (~ECHO);
1025         tcsetattr(0, TCSANOW, &tp);
1026
1027         fprintf(stdout, "Enter password for %s: ", host);
1028         fflush(stdout);
1029         tcflow(0, TCOOFF);
1030         retval = scanf("%79s", pwd);
1031         tcflow(0, TCOON);
1032         fprintf(stdout, "\n");
1033
1034         tcsetattr(0, TCSANOW, &old);
1035
1036         strncpy(buf, pwd, len);
1037         buf[len-1] = '\0';
1038 }
1039
1040 static int find_urls(const char *tweet, int **pranges)
1041 {
1042         /*
1043          * magic obtained from
1044          * http://www.geekpedia.com/KB65_How-to-validate-an-URL-using-RegEx-in-Csharp.html
1045          */
1046         static const char *re_magic =
1047                 "(([a-zA-Z][0-9a-zA-Z+\\-\\.]*:)/{1,3}"
1048                 "[0-9a-zA-Z;/~?:@&=+$\\.\\-_'()%]+)"
1049                 "(#[0-9a-zA-Z;/?:@&=+$\\.\\-_!~*'()%]+)?";
1050         pcre *re;
1051         const char *errptr;
1052         int erroffset;
1053         int ovector[10] = {0,};
1054         const size_t ovsize = sizeof(ovector)/sizeof(*ovector);
1055         int startoffset, tweetlen;
1056         int i, rc;
1057         int rbound = 10;
1058         int rcount = 0;
1059         int *ranges = malloc(sizeof(int) * rbound);
1060
1061         re = pcre_compile(re_magic,
1062                         PCRE_NO_AUTO_CAPTURE,
1063                         &errptr, &erroffset, NULL);
1064         if (!re) {
1065                 fprintf(stderr, "pcre_compile @%u: %s\n", erroffset, errptr);
1066                 exit(1);
1067         }
1068
1069         tweetlen = strlen(tweet);
1070         for (startoffset = 0; startoffset < tweetlen; ) {
1071
1072                 rc = pcre_exec(re, NULL, tweet, strlen(tweet), startoffset, 0,
1073                                 ovector, ovsize);
1074                 if (rc == PCRE_ERROR_NOMATCH)
1075                         break;
1076
1077                 if (rc < 0) {
1078                         fprintf(stderr, "pcre_exec @%u: %s\n",
1079                                 erroffset, errptr);
1080                         exit(1);
1081                 }
1082
1083                 for (i = 0; i < rc; i += 2) {
1084                         if ((rcount+2) == rbound) {
1085                                 rbound *= 2;
1086                                 ranges = realloc(ranges, sizeof(int) * rbound);
1087                         }
1088
1089                         ranges[rcount++] = ovector[i];
1090                         ranges[rcount++] = ovector[i+1];
1091                 }
1092
1093                 startoffset = ovector[1];
1094         }
1095
1096         pcre_free(re);
1097
1098         *pranges = ranges;
1099         return rcount;
1100 }
1101
1102 /**
1103  * bidirectional popen() call
1104  *
1105  * @param rwepipe - int array of size three
1106  * @param exe - program to run
1107  * @param argv - argument list
1108  * @return pid or -1 on error
1109  *
1110  * The caller passes in an array of three integers (rwepipe), on successful
1111  * execution it can then write to element 0 (stdin of exe), and read from
1112  * element 1 (stdout) and 2 (stderr).
1113  */
1114 static int popenRWE(int *rwepipe, const char *exe, const char *const argv[])
1115 {
1116         int in[2];
1117         int out[2];
1118         int err[2];
1119         int pid;
1120         int rc;
1121
1122         rc = pipe(in);
1123         if (rc < 0)
1124                 goto error_in;
1125
1126         rc = pipe(out);
1127         if (rc < 0)
1128                 goto error_out;
1129
1130         rc = pipe(err);
1131         if (rc < 0)
1132                 goto error_err;
1133
1134         pid = fork();
1135         if (pid > 0) {
1136                 /* parent */
1137                 close(in[0]);
1138                 close(out[1]);
1139                 close(err[1]);
1140                 rwepipe[0] = in[1];
1141                 rwepipe[1] = out[0];
1142                 rwepipe[2] = err[0];
1143                 return pid;
1144         } else if (pid == 0) {
1145                 /* child */
1146                 close(in[1]);
1147                 close(out[0]);
1148                 close(err[0]);
1149                 close(0);
1150                 rc = dup(in[0]);
1151                 close(1);
1152                 rc = dup(out[1]);
1153                 close(2);
1154                 rc = dup(err[1]);
1155
1156                 execvp(exe, (char **)argv);
1157                 exit(1);
1158         } else
1159                 goto error_fork;
1160
1161         return pid;
1162
1163 error_fork:
1164         close(err[0]);
1165         close(err[1]);
1166 error_err:
1167         close(out[0]);
1168         close(out[1]);
1169 error_out:
1170         close(in[0]);
1171         close(in[1]);
1172 error_in:
1173         return -1;
1174 }
1175
1176 static int pcloseRWE(int pid, int *rwepipe)
1177 {
1178         int rc, status;
1179         close(rwepipe[0]);
1180         close(rwepipe[1]);
1181         close(rwepipe[2]);
1182         rc = waitpid(pid, &status, 0);
1183         return status;
1184 }
1185
1186 static char *shrink_one_url(int *rwepipe, char *big)
1187 {
1188         int biglen = strlen(big);
1189         char *small;
1190         int smalllen;
1191         int rc;
1192
1193         rc = dprintf(rwepipe[0], "%s\n", big);
1194         if (rc < 0)
1195                 return big;
1196
1197         smalllen = biglen + 128;
1198         small = malloc(smalllen);
1199         if (!small)
1200                 return big;
1201
1202         rc = read(rwepipe[1], small, smalllen);
1203         if (rc < 0 || rc > biglen)
1204                 goto error_free_small;
1205
1206         if (strncmp(small, "http://", 7))
1207                 goto error_free_small;
1208
1209         smalllen = rc;
1210         while (smalllen && isspace(small[smalllen-1]))
1211                         small[--smalllen] = 0;
1212
1213         free(big);
1214         return small;
1215
1216 error_free_small:
1217         free(small);
1218         return big;
1219 }
1220
1221 static char *shrink_urls(char *text)
1222 {
1223         int *ranges;
1224         int rcount;
1225         int i;
1226         int inofs = 0;
1227         int outofs = 0;
1228         const char *const shrink_args[] = {
1229                 "bti-shrink-urls",
1230                 NULL
1231         };
1232         int shrink_pid;
1233         int shrink_pipe[3];
1234         int inlen = strlen(text);
1235
1236         dbg("before len=%u\n", inlen);
1237
1238         shrink_pid = popenRWE(shrink_pipe, shrink_args[0], shrink_args);
1239         if (shrink_pid < 0)
1240                 return text;
1241
1242         rcount = find_urls(text, &ranges);
1243         if (!rcount)
1244                 return text;
1245
1246         for (i = 0; i < rcount; i += 2) {
1247                 int url_start = ranges[i];
1248                 int url_end = ranges[i+1];
1249                 int long_url_len = url_end - url_start;
1250                 char *url = strndup(text + url_start, long_url_len);
1251                 int short_url_len;
1252                 int not_url_len = url_start - inofs;
1253
1254                 dbg("long  url[%u]: %s\n", long_url_len, url);
1255                 url = shrink_one_url(shrink_pipe, url);
1256                 short_url_len = url ? strlen(url) : 0;
1257                 dbg("short url[%u]: %s\n", short_url_len, url);
1258
1259                 if (!url || short_url_len >= long_url_len) {
1260                         /* The short url ended up being too long
1261                          * or unavailable */
1262                         if (inofs) {
1263                                 strncpy(text + outofs, text + inofs,
1264                                                 not_url_len + long_url_len);
1265                         }
1266                         inofs += not_url_len + long_url_len;
1267                         outofs += not_url_len + long_url_len;
1268
1269                 } else {
1270                         /* copy the unmodified block */
1271                         strncpy(text + outofs, text + inofs, not_url_len);
1272                         inofs += not_url_len;
1273                         outofs += not_url_len;
1274
1275                         /* copy the new url */
1276                         strncpy(text + outofs, url, short_url_len);
1277                         inofs += long_url_len;
1278                         outofs += short_url_len;
1279                 }
1280
1281                 free(url);
1282         }
1283
1284         /* copy the last block after the last match */
1285         if (inofs) {
1286                 int tail = inlen - inofs;
1287                 if (tail) {
1288                         strncpy(text + outofs, text + inofs, tail);
1289                         outofs += tail;
1290                 }
1291         }
1292
1293         free(ranges);
1294
1295         (void)pcloseRWE(shrink_pid, shrink_pipe);
1296
1297         text[outofs] = 0;
1298         dbg("after len=%u\n", outofs);
1299         return text;
1300 }
1301
1302 int main(int argc, char *argv[], char *envp[])
1303 {
1304         static const struct option options[] = {
1305                 { "debug", 0, NULL, 'd' },
1306                 { "verbose", 0, NULL, 'V' },
1307                 { "account", 1, NULL, 'a' },
1308                 { "password", 1, NULL, 'p' },
1309                 { "host", 1, NULL, 'H' },
1310                 { "proxy", 1, NULL, 'P' },
1311                 { "action", 1, NULL, 'A' },
1312                 { "user", 1, NULL, 'u' },
1313                 { "group", 1, NULL, 'G' },
1314                 { "logfile", 1, NULL, 'L' },
1315                 { "shrink-urls", 0, NULL, 's' },
1316                 { "help", 0, NULL, 'h' },
1317                 { "bash", 0, NULL, 'b' },
1318                 { "background", 0, NULL, 'B' },
1319                 { "dry-run", 0, NULL, 'n' },
1320                 { "page", 1, NULL, 'g' },
1321                 { "version", 0, NULL, 'v' },
1322                 { "config", 1, NULL, 'c' },
1323                 { "replyto", 1, NULL, 'r' },
1324                 { }
1325         };
1326         struct session *session;
1327         pid_t child;
1328         char *tweet;
1329         static char password[80];
1330         int retval = 0;
1331         int option;
1332         char *http_proxy;
1333         time_t t;
1334         int page_nr;
1335
1336         debug = 0;
1337         verbose = 0;
1338
1339         session = session_alloc();
1340         if (!session) {
1341                 fprintf(stderr, "no more memory...\n");
1342                 return -1;
1343         }
1344
1345         /* get the current time so that we can log it later */
1346         time(&t);
1347         session->time = strdup(ctime(&t));
1348         session->time[strlen(session->time)-1] = 0x00;
1349
1350         /* Get the home directory so we can try to find a config file */
1351         session->homedir = strdup(getenv("HOME"));
1352
1353         /* set up a default config file location (traditionally ~/.bti) */
1354         session->configfile = zalloc(strlen(session->homedir) + 7);
1355         sprintf(session->configfile, "%s/.bti", session->homedir);
1356
1357         /* Set environment variables first, before reading command line options
1358          * or config file values. */
1359         http_proxy = getenv("http_proxy");
1360         if (http_proxy) {
1361                 if (session->proxy)
1362                         free(session->proxy);
1363                 session->proxy = strdup(http_proxy);
1364                 dbg("http_proxy = %s\n", session->proxy);
1365         }
1366
1367         parse_configfile(session);
1368
1369         while (1) {
1370                 option = getopt_long_only(argc, argv,
1371                                           "dp:P:H:a:A:u:c:hg:G:sr:nVv",
1372                                           options, NULL);
1373                 if (option == -1)
1374                         break;
1375                 switch (option) {
1376                 case 'd':
1377                         debug = 1;
1378                         break;
1379                 case 'V':
1380                         verbose = 1;
1381                         break;
1382                 case 'a':
1383                         if (session->account)
1384                                 free(session->account);
1385                         session->account = strdup(optarg);
1386                         dbg("account = %s\n", session->account);
1387                         break;
1388                 case 'g':
1389                         page_nr = atoi(optarg);
1390                         dbg("page = %d\n", page_nr);
1391                         session->page = page_nr;
1392                         break;
1393                 case 'r':
1394                         session->replyto = strdup(optarg);
1395                         dbg("in_reply_to_status_id = %s\n", session->replyto);
1396                         break;
1397                 case 'p':
1398                         if (session->password)
1399                                 free(session->password);
1400                         session->password = strdup(optarg);
1401                         dbg("password = %s\n", session->password);
1402                         break;
1403                 case 'P':
1404                         if (session->proxy)
1405                                 free(session->proxy);
1406                         session->proxy = strdup(optarg);
1407                         dbg("proxy = %s\n", session->proxy);
1408                         break;
1409                 case 'A':
1410                         if (strcasecmp(optarg, "update") == 0)
1411                                 session->action = ACTION_UPDATE;
1412                         else if (strcasecmp(optarg, "friends") == 0)
1413                                 session->action = ACTION_FRIENDS;
1414                         else if (strcasecmp(optarg, "user") == 0)
1415                                 session->action = ACTION_USER;
1416                         else if (strcasecmp(optarg, "replies") == 0)
1417                                 session->action = ACTION_REPLIES;
1418                         else if (strcasecmp(optarg, "public") == 0)
1419                                 session->action = ACTION_PUBLIC;
1420                         else if (strcasecmp(optarg, "group") == 0)
1421                                 session->action = ACTION_GROUP;
1422                         else
1423                                 session->action = ACTION_UNKNOWN;
1424                         dbg("action = %d\n", session->action);
1425                         break;
1426                 case 'u':
1427                         if (session->user)
1428                                 free(session->user);
1429                         session->user = strdup(optarg);
1430                         dbg("user = %s\n", session->user);
1431                         break;
1432
1433                 case 'G':
1434                         if (session->group)
1435                                 free(session->group);
1436                         session->group = strdup(optarg);
1437                         dbg("group = %s\n", session->group);
1438                         break;
1439                 case 'L':
1440                         if (session->logfile)
1441                                 free(session->logfile);
1442                         session->logfile = strdup(optarg);
1443                         dbg("logfile = %s\n", session->logfile);
1444                         break;
1445                 case 's':
1446                         session->shrink_urls = 1;
1447                         break;
1448                 case 'H':
1449                         if (session->hosturl)
1450                                 free(session->hosturl);
1451                         if (session->hostname)
1452                                 free(session->hostname);
1453                         if (strcasecmp(optarg, "twitter") == 0) {
1454                                 session->host = HOST_TWITTER;
1455                                 session->hosturl = strdup(twitter_host);
1456                                 session->hostname = strdup(twitter_name);
1457                         } else if (strcasecmp(optarg, "identica") == 0) {
1458                                 session->host = HOST_IDENTICA;
1459                                 session->hosturl = strdup(identica_host);
1460                                 session->hostname = strdup(identica_name);
1461                         } else {
1462                                 session->host = HOST_CUSTOM;
1463                                 session->hosturl = strdup(optarg);
1464                                 session->hostname = strdup(optarg);
1465                         }
1466                         dbg("host = %d\n", session->host);
1467                         break;
1468                 case 'b':
1469                         session->bash = 1;
1470                         /* fall-through intended */
1471                 case 'B':
1472                         session->background = 1;
1473                         break;
1474                 case 'c':
1475                         if (session->configfile)
1476                                 free(session->configfile);
1477                         session->configfile = strdup(optarg);
1478                         dbg("configfile = %s\n", session->configfile);
1479
1480                         /*
1481                          * read the config file now.  Yes, this could override
1482                          * previously set options from the command line, but
1483                          * the user asked for it...
1484                          */
1485                         parse_configfile(session);
1486                         break;
1487                 case 'h':
1488                         display_help();
1489                         goto exit;
1490                 case 'n':
1491                         session->dry_run = 1;
1492                         break;
1493                 case 'v':
1494                         display_version();
1495                         goto exit;
1496                 default:
1497                         display_help();
1498                         goto exit;
1499                 }
1500         }
1501
1502         session_readline_init(session);
1503         /*
1504          * Show the version to make it easier to determine what
1505          * is going on here
1506          */
1507         if (debug)
1508                 display_version();
1509
1510         if (session->host == HOST_TWITTER) {
1511                 if (!session->consumer_key || !session->consumer_secret) {
1512                         fprintf(stderr,
1513                                 "Twitter no longer supports HTTP basic authentication.\n"
1514                                 "Both consumer key, and consumer secret are required"
1515                                 " for bti in order to behave as an OAuth consumer.\n");
1516                         goto exit;
1517                 }
1518                 if (session->action == ACTION_GROUP) {
1519                         fprintf(stderr, "Groups only work in Identi.ca.\n");
1520                         goto exit;
1521                 }
1522         } else {
1523                 if (!session->consumer_key || !session->consumer_secret)
1524                         session->no_oauth = 1;
1525         }
1526
1527         if (session->no_oauth) {
1528                 if (!session->account) {
1529                         fprintf(stdout, "Enter account for %s: ",
1530                                 session->hostname);
1531                         session->account = session->readline(NULL);
1532                 }
1533                 if (!session->password) {
1534                         read_password(password, sizeof(password),
1535                                       session->hostname);
1536                         session->password = strdup(password);
1537                 }
1538         } else {
1539                 if (!session->access_token_key ||
1540                     !session->access_token_secret) {
1541                         request_access_token(session);
1542                         goto exit;
1543                 }
1544         }
1545
1546         if (session->action == ACTION_UNKNOWN) {
1547                 fprintf(stderr, "Unknown action, valid actions are:\n"
1548                         "'update', 'friends', 'public', 'replies', 'group' or 'user'.\n");
1549                 goto exit;
1550         }
1551
1552         if (session->action == ACTION_GROUP && !session->group) {
1553                 fprintf(stdout, "Enter group name: ");
1554                 session->group = session->readline(NULL);
1555         }
1556
1557         if (session->action == ACTION_UPDATE) {
1558                 if (session->background || !session->interactive)
1559                         tweet = get_string_from_stdin();
1560                 else
1561                         tweet = session->readline("tweet: ");
1562                 if (!tweet || strlen(tweet) == 0) {
1563                         dbg("no tweet?\n");
1564                         return -1;
1565                 }
1566
1567                 if (session->shrink_urls)
1568                         tweet = shrink_urls(tweet);
1569
1570                 session->tweet = zalloc(strlen(tweet) + 10);
1571                 if (session->bash)
1572                         sprintf(session->tweet, "%c %s",
1573                                 getuid() ? '$' : '#', tweet);
1574                 else
1575                         sprintf(session->tweet, "%s", tweet);
1576
1577                 free(tweet);
1578                 dbg("tweet = %s\n", session->tweet);
1579         }
1580
1581         if (session->page == 0)
1582                 session->page = 1;
1583         dbg("config file = %s\n", session->configfile);
1584         dbg("host = %d\n", session->host);
1585         dbg("action = %d\n", session->action);
1586
1587         /* fork ourself so that the main shell can get on
1588          * with it's life as we try to connect and handle everything
1589          */
1590         if (session->background) {
1591                 child = fork();
1592                 if (child) {
1593                         dbg("child is %d\n", child);
1594                         exit(0);
1595                 }
1596         }
1597
1598         retval = send_request(session);
1599         if (retval && !session->background)
1600                 fprintf(stderr, "operation failed\n");
1601
1602         log_session(session, retval);
1603 exit:
1604         session_readline_cleanup(session);
1605         session_free(session);
1606         return retval;;
1607 }