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