bti.c

   1 /*
   2  * Copyright (C) 2008-2010 Greg Kroah-Hartman <greg@kroah.com>
   3  * Copyright (C) 2009 Bart Trojanowski <bart@jukie.net>
   4  * Copyright (C) 2009-2010 Amir Mohammad Saied <amirsaied@gmail.com>
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License as published by the
   8  * Free Software Foundation version 2 of the License.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  18  */
  19
  20 #define _GNU_SOURCE
  21
  22 #include <stdio.h>
  23 #include <stdlib.h>
  24 #include <stddef.h>
  25 #include <string.h>
  26 #include <getopt.h>
  27 #include <errno.h>
  28 #include <ctype.h>
  29 #include <fcntl.h>
  30 #include <unistd.h>
  31 #include <time.h>
  32 #include <sys/stat.h>
  33 #include <sys/types.h>
  34 #include <sys/wait.h>
  35 #include <curl/curl.h>
  36 #include <libxml/xmlmemory.h>
  37 #include <libxml/parser.h>
  38 #include <libxml/tree.h>
  39 #include <pcre.h>
  40 #include <termios.h>
  41 #include <dlfcn.h>
  42 #include <oauth.h>
  43
  44
  45 #define zalloc(size)    calloc(size, 1)
  46
  47 #define dbg(format, arg...)                                             \
  48         do {                                                            \
  49                 if (debug)                                              \
  50                         fprintf(stdout, "bti: %s: " format , __func__ , \
  51                                 ## arg);                                \
  52         } while (0)
  53
  54
  55 static int debug;
  56 static int verbose;
  57
  58 enum host {
  59         HOST_TWITTER  = 0,
  60         HOST_IDENTICA = 1,
  61         HOST_CUSTOM   = 2
  62 };
  63
  64 enum action {
  65         ACTION_UPDATE  = 0,
  66         ACTION_FRIENDS = 1,
  67         ACTION_USER    = 2,
  68         ACTION_REPLIES = 4,
  69         ACTION_PUBLIC  = 8,
  70         ACTION_GROUP   = 16,
  71         ACTION_RETWEET = 32,
  72         ACTION_UNKNOWN = 64
  73 };
  74
  75 struct session {
  76         char *password;
  77         char *account;
  78         char *consumer_key;
  79         char *consumer_secret;
  80         char *access_token_key;
  81         char *access_token_secret;
  82         char *tweet;
  83         char *proxy;
  84         char *time;
  85         char *homedir;
  86         char *logfile;
  87         char *user;
  88         char *group;
  89         char *hosturl;
  90         char *hostname;
  91         char *configfile;
  92         char *replyto;
  93         char *retweet;
  94         int bash;
  95         int background;
  96         int interactive;
  97         int shrink_urls;
  98         int dry_run;
  99         int page;
 100         int no_oauth;
 101         int guest;
 102         enum host host;
 103         enum action action;
 104         void *readline_handle;
 105         char *(*readline)(const char *);
 106 };
 107
 108 struct bti_curl_buffer {
 109         char *data;
 110         enum action action;
 111         int length;
 112 };
 113
 114 static void display_help(void)
 115 {
 116         fprintf(stdout, "bti - send tweet to twitter or identi.ca\n"
 117                 "Version: %s\n"
 118                 "Usage:\n"
 119                 "  bti [options]\n"
 120                 "options are:\n"
 121                 "  --account accountname\n"
 122                 "  --password password\n"
 123                 "  --action action\n"
 124                 "    ('update', 'friends', 'public', 'replies', or 'user')\n"
 125                 "  --user screenname\n"
 126                 "  --group groupname\n"
 127                 "  --proxy PROXY:PORT\n"
 128                 "  --host HOST\n"
 129                 "  --logfile logfile\n"
 130                 "  --config configfile\n"
 131                 "  --replyto ID\n"
 132                 "  --retweet ID\n"
 133                 "  --shrink-urls\n"
 134                 "  --page PAGENUMBER\n"
 135                 "  --bash\n"
 136                 "  --background\n"
 137                 "  --debug\n"
 138                 "  --verbose\n"
 139                 "  --dry-run\n"
 140                 "  --version\n"
 141                 "  --help\n", VERSION);
 142 }
 143
 144 static void display_version(void)
 145 {
 146         fprintf(stdout, "bti - version %s\n", VERSION);
 147 }
 148
 149 static char *get_string(const char *name)
 150 {
 151         char *temp;
 152         char *string;
 153
 154         string = zalloc(1000);
 155         if (!string)
 156                 exit(1);
 157         if (name != NULL)
 158                 fprintf(stdout, "%s", name);
 159         if (!fgets(string, 999, stdin))
 160                 return NULL;
 161         temp = strchr(string, '\n');
 162         if (temp)
 163                 *temp = '\0';
 164         return string;
 165 }
 166
 167 /*
 168  * Try to get a handle to a readline function from a variety of different
 169  * libraries.  If nothing is present on the system, then fall back to an
 170  * internal one.
 171  *
 172  * Logic originally based off of code in the e2fsutils package in the
 173  * lib/ss/get_readline.c file, which is licensed under the MIT license.
 174  *
 175  * This keeps us from having to relicense the bti codebase if readline
 176  * ever changes its license, as there is no link-time dependancy.
 177  * It is a run-time thing only, and we handle any readline-like library
 178  * in the same manner, making bti not be a derivative work of any
 179  * other program.
 180  */
 181 static void session_readline_init(struct session *session)
 182 {
 183         /* Libraries we will try to use for readline/editline functionality */
 184         const char *libpath = "libreadline.so.6:libreadline.so.5:"
 185                                 "libreadline.so.4:libreadline.so:libedit.so.2:"
 186                                 "libedit.so:libeditline.so.0:libeditline.so";
 187         void *handle = NULL;
 188         char *tmp, *cp, *next;
 189         int (*bind_key)(int, void *);
 190         void (*insert)(void);
 191
 192         /* default to internal function if we can't or won't find anything */
 193         session->readline = get_string;
 194         if (!isatty(0))
 195                 return;
 196         session->interactive = 1;
 197
 198         tmp = malloc(strlen(libpath)+1);
 199         if (!tmp)
 200                 return;
 201         strcpy(tmp, libpath);
 202         for (cp = tmp; cp; cp = next) {
 203                 next = strchr(cp, ':');
 204                 if (next)
 205                         *next++ = 0;
 206                 if (*cp == 0)
 207                         continue;
 208                 handle = dlopen(cp, RTLD_NOW);
 209                 if (handle) {
 210                         dbg("Using %s for readline library\n", cp);
 211                         break;
 212                 }
 213         }
 214         free(tmp);
 215         if (!handle) {
 216                 dbg("No readline library found.\n");
 217                 return;
 218         }
 219
 220         session->readline_handle = handle;
 221         session->readline = (char *(*)(const char *))dlsym(handle, "readline");
 222         if (session->readline == NULL) {
 223                 /* something odd happened, default back to internal stuff */
 224                 session->readline_handle = NULL;
 225                 session->readline = get_string;
 226                 return;
 227         }
 228
 229         /*
 230          * If we found a library, turn off filename expansion
 231          * as that makes no sense from within bti.
 232          */
 233         bind_key = (int (*)(int, void *))dlsym(handle, "rl_bind_key");
 234         insert = (void (*)(void))dlsym(handle, "rl_insert");
 235         if (bind_key && insert)
 236                 bind_key('\t', insert);
 237 }
 238
 239 static void session_readline_cleanup(struct session *session)
 240 {
 241         if (session->readline_handle)
 242                 dlclose(session->readline_handle);
 243 }
 244
 245 static struct session *session_alloc(void)
 246 {
 247         struct session *session;
 248
 249         session = zalloc(sizeof(*session));
 250         if (!session)
 251                 return NULL;
 252         return session;
 253 }
 254
 255 static void session_free(struct session *session)
 256 {
 257         if (!session)
 258                 return;
 259         free(session->retweet);
 260         free(session->replyto);
 261         free(session->password);
 262         free(session->account);
 263         free(session->consumer_key);
 264         free(session->consumer_secret);
 265         free(session->access_token_key);
 266         free(session->access_token_secret);
 267         free(session->tweet);
 268         free(session->proxy);
 269         free(session->time);
 270         free(session->homedir);
 271         free(session->user);
 272         free(session->group);
 273         free(session->hosturl);
 274         free(session->hostname);
 275         free(session->configfile);
 276         free(session);
 277 }
 278
 279 static struct bti_curl_buffer *bti_curl_buffer_alloc(enum action action)
 280 {
 281         struct bti_curl_buffer *buffer;
 282
 283         buffer = zalloc(sizeof(*buffer));
 284         if (!buffer)
 285                 return NULL;
 286
 287         /* start out with a data buffer of 1 byte to
 288          * make the buffer fill logic simpler */
 289         buffer->data = zalloc(1);
 290         if (!buffer->data) {
 291                 free(buffer);
 292                 return NULL;
 293         }
 294         buffer->length = 0;
 295         buffer->action = action;
 296         return buffer;
 297 }
 298
 299 static void bti_curl_buffer_free(struct bti_curl_buffer *buffer)
 300 {
 301         if (!buffer)
 302                 return;
 303         free(buffer->data);
 304         free(buffer);
 305 }
 306
 307 static const char twitter_host[]  = "http://api.twitter.com/1/statuses";
 308 static const char identica_host[] = "https://identi.ca/api/statuses";
 309 static const char twitter_name[]  = "twitter";
 310 static const char identica_name[] = "identi.ca";
 311
 312 static const char twitter_request_token_uri[]  = "http://twitter.com/oauth/request_token";
 313 static const char twitter_access_token_uri[]   = "http://twitter.com/oauth/access_token";
 314 static const char twitter_authorize_uri[]      = "http://twitter.com/oauth/authorize?oauth_token=";
 315 static const char identica_request_token_uri[] = "http://identi.ca/api/oauth/request_token?oauth_callback=oob";
 316 static const char identica_access_token_uri[]  = "http://identi.ca/api/oauth/access_token";
 317 static const char identica_authorize_uri[]     = "http://identi.ca/api/oauth/authorize?oauth_token=";
 318
 319 static const char user_uri[]     = "/user_timeline/";
 320 static const char update_uri[]   = "/update.xml";
 321 static const char public_uri[]   = "/public_timeline.xml";
 322 static const char friends_uri[]  = "/friends_timeline.xml";
 323 static const char mentions_uri[] = "/mentions.xml";
 324 static const char replies_uri[]  = "/replies.xml";
 325 static const char retweet_uri[]  = "/retweet/";
 326 static const char group_uri[]    = "/../statusnet/groups/timeline/";
 327
 328 static CURL *curl_init(void)
 329 {
 330         CURL *curl;
 331
 332         curl = curl_easy_init();
 333         if (!curl) {
 334                 fprintf(stderr, "Can not init CURL!\n");
 335                 return NULL;
 336         }
 337         /* some ssl sanity checks on the connection we are making */
 338         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0);
 339         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0);
 340         return curl;
 341 }
 342
 343 static void parse_statuses(xmlDocPtr doc, xmlNodePtr current)
 344 {
 345         xmlChar *text = NULL;
 346         xmlChar *user = NULL;
 347         xmlChar *created = NULL;
 348         xmlChar *id = NULL;
 349         xmlNodePtr userinfo;
 350
 351         current = current->xmlChildrenNode;
 352         while (current != NULL) {
 353                 if (current->type == XML_ELEMENT_NODE) {
 354                         if (!xmlStrcmp(current->name, (const xmlChar *)"created_at"))
 355                                 created = xmlNodeListGetString(doc, current->xmlChildrenNode, 1);
 356                         if (!xmlStrcmp(current->name, (const xmlChar *)"text"))
 357                                 text = xmlNodeListGetString(doc, current->xmlChildrenNode, 1);
 358                         if (!xmlStrcmp(current->name, (const xmlChar *)"id"))
 359                                 id = xmlNodeListGetString(doc, current->xmlChildrenNode, 1);
 360                         if (!xmlStrcmp(current->name, (const xmlChar *)"user")) {
 361                                 userinfo = current->xmlChildrenNode;
 362                                 while (userinfo != NULL) {
 363                                         if ((!xmlStrcmp(userinfo->name, (const xmlChar *)"screen_name"))) {
 364                                                 if (user)
 365                                                         xmlFree(user);
 366                                                 user = xmlNodeListGetString(doc, userinfo->xmlChildrenNode, 1);
 367                                         }
 368                                         userinfo = userinfo->next;
 369                                 }
 370                         }
 371
 372                         if (user && text && created && id) {
 373                                 if (verbose)
 374                                         printf("[%s] {%s} (%.16s) %s\n",
 375                                                 user, id, created, text);
 376                                 else
 377                                         printf("[%s] %s\n",
 378                                                 user, text);
 379                                 xmlFree(user);
 380                                 xmlFree(text);
 381                                 xmlFree(created);
 382                                 xmlFree(id);
 383                                 user = NULL;
 384                                 text = NULL;
 385                                 created = NULL;
 386                                 id = NULL;
 387                         }
 388                 }
 389                 current = current->next;
 390         }
 391
 392         return;
 393 }
 394
 395 static void parse_timeline(char *document)
 396 {
 397         xmlDocPtr doc;
 398         xmlNodePtr current;
 399
 400         doc = xmlReadMemory(document, strlen(document), "timeline.xml",
 401                             NULL, XML_PARSE_NOERROR);
 402         if (doc == NULL)
 403                 return;
 404
 405         current = xmlDocGetRootElement(doc);
 406         if (current == NULL) {
 407                 fprintf(stderr, "empty document\n");
 408                 xmlFreeDoc(doc);
 409                 return;
 410         }
 411
 412         if (xmlStrcmp(current->name, (const xmlChar *) "statuses")) {
 413                 fprintf(stderr, "unexpected document type\n");
 414                 xmlFreeDoc(doc);
 415                 return;
 416         }
 417
 418         current = current->xmlChildrenNode;
 419         while (current != NULL) {
 420                 if ((!xmlStrcmp(current->name, (const xmlChar *)"status")))
 421                         parse_statuses(doc, current);
 422                 current = current->next;
 423         }
 424         xmlFreeDoc(doc);
 425
 426         return;
 427 }
 428
 429 static size_t curl_callback(void *buffer, size_t size, size_t nmemb,
 430                             void *userp)
 431 {
 432         struct bti_curl_buffer *curl_buf = userp;
 433         size_t buffer_size = size * nmemb;
 434         char *temp;
 435
 436         if ((!buffer) || (!buffer_size) || (!curl_buf))
 437                 return -EINVAL;
 438
 439         /* add to the data we already have */
 440         temp = zalloc(curl_buf->length + buffer_size + 1);
 441         if (!temp)
 442                 return -ENOMEM;
 443
 444         memcpy(temp, curl_buf->data, curl_buf->length);
 445         free(curl_buf->data);
 446         curl_buf->data = temp;
 447         memcpy(&curl_buf->data[curl_buf->length], (char *)buffer, buffer_size);
 448         curl_buf->length += buffer_size;
 449         if (curl_buf->action)
 450                 parse_timeline(curl_buf->data);
 451
 452         dbg("%s\n", curl_buf->data);
 453
 454         return buffer_size;
 455 }
 456
 457 static int parse_osp_reply(const char *reply, char **token, char **secret)
 458 {
 459         int rc;
 460         int retval = 1;
 461         char **rv = NULL;
 462         rc = oauth_split_url_parameters(reply, &rv);
 463         qsort(rv, rc, sizeof(char *), oauth_cmpstringp);
 464         if (rc == 2 || rc == 4) {
 465                 if (!strncmp(rv[0], "oauth_token=", 11) &&
 466                     !strncmp(rv[1], "oauth_token_secret=", 18)) {
 467                         if (token)
 468                                 *token = strdup(&(rv[0][12]));
 469                         if (secret)
 470                                 *secret = strdup(&(rv[1][19]));
 471
 472                         retval = 0;
 473                 }
 474         } else if (rc == 3) {
 475                 if (!strncmp(rv[1], "oauth_token=", 11) &&
 476                     !strncmp(rv[2], "oauth_token_secret=", 18)) {
 477                         if (token)
 478                                 *token = strdup(&(rv[1][12]));
 479                         if (secret)
 480                                 *secret = strdup(&(rv[2][19]));
 481
 482                         retval = 0;
 483                 }
 484         }
 485
 486         dbg("token: %s\n", *token);
 487         dbg("secret: %s\n", *secret);
 488
 489         if (rv)
 490                 free(rv);
 491
 492         return retval;
 493 }
 494
 495 static int request_access_token(struct session *session)
 496 {
 497         char *post_params = NULL;
 498         char *request_url = NULL;
 499         char *reply       = NULL;
 500         char *at_key      = NULL;
 501         char *at_secret   = NULL;
 502         char *verifier    = NULL;
 503         char at_uri[90];
 504
 505         if (!session)
 506                 return -EINVAL;
 507
 508         if (session->host == HOST_TWITTER)
 509                 request_url = oauth_sign_url2(
 510                                 twitter_request_token_uri, NULL,
 511                                 OA_HMAC, NULL, session->consumer_key,
 512                                 session->consumer_secret, NULL, NULL);
 513         else if (session->host == HOST_IDENTICA)
 514                 request_url = oauth_sign_url2(
 515                                 identica_request_token_uri, NULL,
 516                                 OA_HMAC, NULL, session->consumer_key,
 517                                 session->consumer_secret, NULL, NULL);
 518         reply = oauth_http_get(request_url, post_params);
 519
 520         if (request_url)
 521                 free(request_url);
 522
 523         if (post_params)
 524                 free(post_params);
 525
 526         if (!reply)
 527                 return 1;
 528
 529         if (parse_osp_reply(reply, &at_key, &at_secret))
 530                 return 1;
 531
 532         free(reply);
 533
 534         fprintf(stdout,
 535                 "Please open the following link in your browser, and "
 536                 "allow 'bti' to access your account. Then paste "
 537                 "back the provided PIN in here.\n");
 538         if (session->host == HOST_TWITTER) {
 539                 fprintf(stdout, "%s%s\nPIN: ", twitter_authorize_uri, at_key);
 540                 verifier = session->readline(NULL);
 541                 sprintf(at_uri, "%s?oauth_verifier=%s",
 542                         twitter_access_token_uri, verifier);
 543         } else if (session->host == HOST_IDENTICA) {
 544                 fprintf(stdout, "%s%s\nPIN: ", identica_authorize_uri, at_key);
 545                 verifier = session->readline(NULL);
 546                 sprintf(at_uri, "%s?oauth_verifier=%s",
 547                         identica_access_token_uri, verifier);
 548         }
 549         request_url = oauth_sign_url2(at_uri, NULL, OA_HMAC, NULL,
 550                                       session->consumer_key,
 551                                       session->consumer_secret,
 552                                       at_key, at_secret);
 553         reply = oauth_http_get(request_url, post_params);
 554
 555         if (!reply)
 556                 return 1;
 557
 558         if (parse_osp_reply(reply, &at_key, &at_secret))
 559                 return 1;
 560
 561         free(reply);
 562
 563         fprintf(stdout,
 564                 "Please put these two lines in your bti "
 565                 "configuration file (~/.bti):\n"
 566                 "access_token_key=%s\n"
 567                 "access_token_secret=%s\n",
 568                 at_key, at_secret);
 569
 570         return 0;
 571 }
 572
 573 static int send_request(struct session *session)
 574 {
 575         char endpoint[500];
 576         char user_password[500];
 577         char data[500];
 578         struct bti_curl_buffer *curl_buf;
 579         CURL *curl = NULL;
 580         CURLcode res;
 581         struct curl_httppost *formpost = NULL;
 582         struct curl_httppost *lastptr = NULL;
 583         struct curl_slist *slist = NULL;
 584         char *req_url = NULL;
 585         char *reply = NULL;
 586         char *postarg = NULL;
 587         char *escaped_tweet = NULL;
 588         int is_post = 0;
 589
 590         if (!session)
 591                 return -EINVAL;
 592
 593         if (!session->hosturl)
 594                 session->hosturl = strdup(twitter_host);
 595
 596         if (session->no_oauth || session->guest) {
 597                 curl_buf = bti_curl_buffer_alloc(session->action);
 598                 if (!curl_buf)
 599                         return -ENOMEM;
 600
 601                 curl = curl_init();
 602                 if (!curl)
 603                         return -EINVAL;
 604
 605                 if (!session->hosturl)
 606                         session->hosturl = strdup(twitter_host);
 607
 608                 switch (session->action) {
 609                 case ACTION_UPDATE:
 610                         snprintf(user_password, sizeof(user_password), "%s:%s",
 611                                  session->account, session->password);
 612                         snprintf(data, sizeof(data), "status=\"%s\"",
 613                                  session->tweet);
 614                         curl_formadd(&formpost, &lastptr,
 615                                      CURLFORM_COPYNAME, "status",
 616                                      CURLFORM_COPYCONTENTS, session->tweet,
 617                                      CURLFORM_END);
 618
 619                         curl_formadd(&formpost, &lastptr,
 620                                      CURLFORM_COPYNAME, "source",
 621                                      CURLFORM_COPYCONTENTS, "bti",
 622                                      CURLFORM_END);
 623
 624                         if (session->replyto)
 625                                 curl_formadd(&formpost, &lastptr,
 626                                              CURLFORM_COPYNAME, "in_reply_to_status_id",
 627                                              CURLFORM_COPYCONTENTS, session->replyto,
 628                                              CURLFORM_END);
 629
 630                         curl_easy_setopt(curl, CURLOPT_HTTPPOST, formpost);
 631                         slist = curl_slist_append(slist, "Expect:");
 632                         curl_easy_setopt(curl, CURLOPT_HTTPHEADER, slist);
 633
 634                         sprintf(endpoint, "%s%s", session->hosturl, update_uri);
 635                         curl_easy_setopt(curl, CURLOPT_URL, endpoint);
 636                         curl_easy_setopt(curl, CURLOPT_USERPWD, user_password);
 637                         break;
 638
 639                 case ACTION_FRIENDS:
 640                         snprintf(user_password, sizeof(user_password), "%s:%s",
 641                                  session->account, session->password);
 642                         sprintf(endpoint, "%s%s?page=%d", session->hosturl,
 643                                         friends_uri, session->page);
 644                         curl_easy_setopt(curl, CURLOPT_URL, endpoint);
 645                         curl_easy_setopt(curl, CURLOPT_USERPWD, user_password);
 646                         break;
 647
 648                 case ACTION_USER:
 649                         sprintf(endpoint, "%s%s%s.xml?page=%d", session->hosturl,
 650                                 user_uri, session->user, session->page);
 651                         curl_easy_setopt(curl, CURLOPT_URL, endpoint);
 652                         break;
 653
 654                 case ACTION_REPLIES:
 655                         snprintf(user_password, sizeof(user_password), "%s:%s",
 656                                  session->account, session->password);
 657                         sprintf(endpoint, "%s%s?page=%d", session->hosturl,
 658                                 replies_uri, session->page);
 659                         curl_easy_setopt(curl, CURLOPT_URL, endpoint);
 660                         curl_easy_setopt(curl, CURLOPT_USERPWD, user_password);
 661                         break;
 662
 663                 case ACTION_PUBLIC:
 664                         sprintf(endpoint, "%s%s?page=%d", session->hosturl,
 665                                 public_uri, session->page);
 666                         curl_easy_setopt(curl, CURLOPT_URL, endpoint);
 667                         break;
 668
 669                 case ACTION_GROUP:
 670                         sprintf(endpoint, "%s%s%s.xml?page=%d",
 671                                 session->hosturl, group_uri, session->group,
 672                                 session->page);
 673                         curl_easy_setopt(curl, CURLOPT_URL, endpoint);
 674                         break;
 675
 676                 default:
 677                         break;
 678                 }
 679
 680                 if (session->proxy)
 681                         curl_easy_setopt(curl, CURLOPT_PROXY, session->proxy);
 682
 683                 if (debug)
 684                         curl_easy_setopt(curl, CURLOPT_VERBOSE, 1);
 685
 686                 dbg("user_password = %s\n", user_password);
 687                 dbg("data = %s\n", data);
 688                 dbg("proxy = %s\n", session->proxy);
 689
 690                 curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, curl_callback);
 691                 curl_easy_setopt(curl, CURLOPT_WRITEDATA, curl_buf);
 692                 if (!session->dry_run) {
 693                         res = curl_easy_perform(curl);
 694                         if (res && !session->background) {
 695                                 fprintf(stderr, "error(%d) trying to perform "
 696                                                 "operation\n", res);
 697                                 return -EINVAL;
 698                         }
 699                 }
 700
 701                 curl_easy_cleanup(curl);
 702                 if (session->action == ACTION_UPDATE)
 703                         curl_formfree(formpost);
 704                 bti_curl_buffer_free(curl_buf);
 705         } else {
 706                 switch (session->action) {
 707                 case ACTION_UPDATE:
 708                         escaped_tweet = oauth_url_escape(session->tweet);
 709                         if (session->replyto) {
 710                                 sprintf(endpoint,
 711                                         "%s%s?status=%s&in_reply_to_status_id=%s",
 712                                         session->hosturl, update_uri,
 713                                         escaped_tweet, session->replyto);
 714                         } else {
 715                                 sprintf(endpoint, "%s%s?status=%s",
 716                                         session->hosturl, update_uri,
 717                                         escaped_tweet);
 718                         }
 719
 720                         is_post = 1;
 721                         break;
 722                 case ACTION_USER:
 723                         sprintf(endpoint, "%s%s%s.xml?page=%d",
 724                                 session->hosturl, user_uri, session->user,
 725                                 session->page);
 726                         break;
 727                 case ACTION_REPLIES:
 728                         sprintf(endpoint, "%s%s?page=%d", session->hosturl,
 729                                 mentions_uri, session->page);
 730                         break;
 731                 case ACTION_PUBLIC:
 732                         sprintf(endpoint, "%s%s?page=%d", session->hosturl,
 733                                 public_uri, session->page);
 734                         break;
 735                 case ACTION_GROUP:
 736                         sprintf(endpoint, "%s%s%s.xml?page=%d",
 737                                 session->hosturl, group_uri, session->group,
 738                                 session->page);
 739                         break;
 740                 case ACTION_FRIENDS:
 741                         sprintf(endpoint, "%s%s?page=%d", session->hosturl,
 742                                 friends_uri, session->page);
 743                         break;
 744                 case ACTION_RETWEET:
 745                         sprintf(endpoint, "%s%s%s.xml", session->hosturl,
 746                                 retweet_uri, session->retweet);
 747                         is_post = 1;
 748                         break;
 749                 default:
 750                         break;
 751                 }
 752
 753                 dbg("%s\n", endpoint);
 754                 if (!session->dry_run) {
 755                         if (is_post) {
 756                                 req_url = oauth_sign_url2(endpoint, &postarg, OA_HMAC,
 757                                                           NULL, session->consumer_key,
 758                                                           session->consumer_secret,
 759                                                           session->access_token_key,
 760                                                           session->access_token_secret);
 761                                 reply = oauth_http_post(req_url, postarg);
 762                         } else {
 763                                 req_url = oauth_sign_url2(endpoint, NULL, OA_HMAC, NULL,
 764                                                           session->consumer_key,
 765                                                           session->consumer_secret,
 766                                                           session->access_token_key,
 767                                                           session->access_token_secret);
 768                                 reply = oauth_http_get(req_url, postarg);
 769                         }
 770
 771                         dbg("%s\n", req_url);
 772                         dbg("%s\n", reply);
 773                         if (req_url)
 774                                 free(req_url);
 775                 }
 776
 777                 if ((session->action != ACTION_UPDATE) &&
 778                                 (session->action != ACTION_RETWEET))
 779                         parse_timeline(reply);
 780         }
 781         return 0;
 782 }
 783
 784 static void parse_configfile(struct session *session)
 785 {
 786         FILE *config_file;
 787         char *line = NULL;
 788         size_t len = 0;
 789         char *account = NULL;
 790         char *password = NULL;
 791         char *consumer_key = NULL;
 792         char *consumer_secret = NULL;
 793         char *access_token_key = NULL;
 794         char *access_token_secret = NULL;
 795         char *host = NULL;
 796         char *proxy = NULL;
 797         char *logfile = NULL;
 798         char *action = NULL;
 799         char *user = NULL;
 800         char *replyto = NULL;
 801         char *retweet = NULL;
 802         int shrink_urls = 0;
 803
 804         config_file = fopen(session->configfile, "r");
 805
 806         /* No error if file does not exist or is unreadable.  */
 807         if (config_file == NULL)
 808                 return;
 809
 810         do {
 811                 ssize_t n = getline(&line, &len, config_file);
 812                 if (n < 0)
 813                         break;
 814                 if (line[n - 1] == '\n')
 815                         line[n - 1] = '\0';
 816                 /* Parse file.  Format is the usual value pairs:
 817                    account=name
 818                    passwort=value
 819                    # is a comment character
 820                 */
 821                 *strchrnul(line, '#') = '\0';
 822                 char *c = line;
 823                 while (isspace(*c))
 824                         c++;
 825                 /* Ignore blank lines.  */
 826                 if (c[0] == '\0')
 827                         continue;
 828
 829                 if (!strncasecmp(c, "account", 7) && (c[7] == '=')) {
 830                         c += 8;
 831                         if (c[0] != '\0')
 832                                 account = strdup(c);
 833                 } else if (!strncasecmp(c, "password", 8) &&
 834                            (c[8] == '=')) {
 835                         c += 9;
 836                         if (c[0] != '\0')
 837                                 password = strdup(c);
 838                 } else if (!strncasecmp(c, "consumer_key", 12) &&
 839                            (c[12] == '=')) {
 840                         c += 13;
 841                         if (c[0] != '\0')
 842                                 consumer_key = strdup(c);
 843                 } else if (!strncasecmp(c, "consumer_secret", 15) &&
 844                            (c[15] == '=')) {
 845                         c += 16;
 846                         if (c[0] != '\0')
 847                                 consumer_secret = strdup(c);
 848                 } else if (!strncasecmp(c, "access_token_key", 16) &&
 849                            (c[16] == '=')) {
 850                         c += 17;
 851                         if (c[0] != '\0')
 852                                 access_token_key = strdup(c);
 853                 } else if (!strncasecmp(c, "access_token_secret", 19) &&
 854                            (c[19] == '=')) {
 855                         c += 20;
 856                         if (c[0] != '\0')
 857                                 access_token_secret = strdup(c);
 858                 } else if (!strncasecmp(c, "host", 4) &&
 859                            (c[4] == '=')) {
 860                         c += 5;
 861                         if (c[0] != '\0')
 862                                 host = strdup(c);
 863                 } else if (!strncasecmp(c, "proxy", 5) &&
 864                            (c[5] == '=')) {
 865                         c += 6;
 866                         if (c[0] != '\0')
 867                                 proxy = strdup(c);
 868                 } else if (!strncasecmp(c, "logfile", 7) &&
 869                            (c[7] == '=')) {
 870                         c += 8;
 871                         if (c[0] != '\0')
 872                                 logfile = strdup(c);
 873                 } else if (!strncasecmp(c, "replyto", 7) &&
 874                            (c[7] == '=')) {
 875                         c += 8;
 876                         if (c[0] != '\0')
 877                                 replyto = strdup(c);
 878                 } else if (!strncasecmp(c, "action", 6) &&
 879                            (c[6] == '=')) {
 880                         c += 7;
 881                         if (c[0] != '\0')
 882                                 action = strdup(c);
 883                 } else if (!strncasecmp(c, "user", 4) &&
 884                                 (c[4] == '=')) {
 885                         c += 5;
 886                         if (c[0] != '\0')
 887                                 user = strdup(c);
 888                 } else if (!strncasecmp(c, "shrink-urls", 11) &&
 889                                 (c[11] == '=')) {
 890                         c += 12;
 891                         if (!strncasecmp(c, "true", 4) ||
 892                                         !strncasecmp(c, "yes", 3))
 893                                 shrink_urls = 1;
 894                 } else if (!strncasecmp(c, "verbose", 7) &&
 895                                 (c[7] == '=')) {
 896                         c += 8;
 897                         if (!strncasecmp(c, "true", 4) ||
 898                                         !strncasecmp(c, "yes", 3))
 899                                 verbose = 1;
 900                 } else if (!strncasecmp(c,"retweet", 7) &&
 901                                 (c[7] == '=')) {
 902                         c += 8;
 903                         if (c[0] != '\0')
 904                                 retweet = strdup(c);
 905                 }
 906         } while (!feof(config_file));
 907
 908         if (password)
 909                 session->password = password;
 910         if (account)
 911                 session->account = account;
 912         if (consumer_key)
 913                 session->consumer_key = consumer_key;
 914         if (consumer_secret)
 915                 session->consumer_secret = consumer_secret;
 916         if (access_token_key)
 917                 session->access_token_key = access_token_key;
 918         if (access_token_secret)
 919                 session->access_token_secret = access_token_secret;
 920         if (host) {
 921                 if (strcasecmp(host, "twitter") == 0) {
 922                         session->host = HOST_TWITTER;
 923                         session->hosturl = strdup(twitter_host);
 924                         session->hostname = strdup(twitter_name);
 925                 } else if (strcasecmp(host, "identica") == 0) {
 926                         session->host = HOST_IDENTICA;
 927                         session->hosturl = strdup(identica_host);
 928                         session->hostname = strdup(identica_name);
 929                 } else {
 930                         session->host = HOST_CUSTOM;
 931                         session->hosturl = strdup(host);
 932                         session->hostname = strdup(host);
 933                 }
 934                 free(host);
 935         }
 936         if (proxy) {
 937                 if (session->proxy)
 938                         free(session->proxy);
 939                 session->proxy = proxy;
 940         }
 941         if (logfile)
 942                 session->logfile = logfile;
 943         if (replyto)
 944                 session->replyto = replyto;
 945         if (retweet)
 946                 session->retweet = retweet;
 947         if (action) {
 948                 if (strcasecmp(action, "update") == 0)
 949                         session->action = ACTION_UPDATE;
 950                 else if (strcasecmp(action, "friends") == 0)
 951                         session->action = ACTION_FRIENDS;
 952                 else if (strcasecmp(action, "user") == 0)
 953                         session->action = ACTION_USER;
 954                 else if (strcasecmp(action, "replies") == 0)
 955                         session->action = ACTION_REPLIES;
 956                 else if (strcasecmp(action, "public") == 0)
 957                         session->action = ACTION_PUBLIC;
 958                 else if (strcasecmp(action, "group") == 0)
 959                         session->action = ACTION_GROUP;
 960                 else
 961                         session->action = ACTION_UNKNOWN;
 962                 free(action);
 963         }
 964         if (user)
 965                 session->user = user;
 966         session->shrink_urls = shrink_urls;
 967
 968         /* Free buffer and close file.  */
 969         free(line);
 970         fclose(config_file);
 971 }
 972
 973 static void log_session(struct session *session, int retval)
 974 {
 975         FILE *log_file;
 976         char *filename;
 977
 978         /* Only log something if we have a log file set */
 979         if (!session->logfile)
 980                 return;
 981
 982         filename = alloca(strlen(session->homedir) +
 983                           strlen(session->logfile) + 3);
 984
 985         sprintf(filename, "%s/%s", session->homedir, session->logfile);
 986
 987         log_file = fopen(filename, "a+");
 988         if (log_file == NULL)
 989                 return;
 990
 991         switch (session->action) {
 992         case ACTION_UPDATE:
 993                 if (retval)
 994                         fprintf(log_file, "%s: host=%s tweet failed\n",
 995                                 session->time, session->hostname);
 996                 else
 997                         fprintf(log_file, "%s: host=%s tweet=%s\n",
 998                                 session->time, session->hostname,
 999                                 session->tweet);
1000                 break;
1001         case ACTION_FRIENDS:
1002                 fprintf(log_file, "%s: host=%s retrieving friends timeline\n",
1003                         session->time, session->hostname);
1004                 break;
1005         case ACTION_USER:
1006                 fprintf(log_file, "%s: host=%s retrieving %s's timeline\n",
1007                         session->time, session->hostname, session->user);
1008                 break;
1009         case ACTION_REPLIES:
1010                 fprintf(log_file, "%s: host=%s retrieving replies\n",
1011                         session->time, session->hostname);
1012                 break;
1013         case ACTION_PUBLIC:
1014                 fprintf(log_file, "%s: host=%s retrieving public timeline\n",
1015                         session->time, session->hostname);
1016                 break;
1017         case ACTION_GROUP:
1018                 fprintf(log_file, "%s: host=%s retrieving group timeline\n",
1019                         session->time, session->hostname);
1020                 break;
1021         default:
1022                 break;
1023         }
1024
1025         fclose(log_file);
1026 }
1027
1028 static char *get_string_from_stdin(void)
1029 {
1030         char *temp;
1031         char *string;
1032
1033         string = zalloc(1000);
1034         if (!string)
1035                 return NULL;
1036
1037         if (!fgets(string, 999, stdin))
1038                 return NULL;
1039         temp = strchr(string, '\n');
1040         if (temp)
1041                 *temp = '\0';
1042         return string;
1043 }
1044
1045 static void read_password(char *buf, size_t len, char *host)
1046 {
1047         char pwd[80];
1048         int retval;
1049         struct termios old;
1050         struct termios tp;
1051
1052         tcgetattr(0, &tp);
1053         old = tp;
1054
1055         tp.c_lflag &= (~ECHO);
1056         tcsetattr(0, TCSANOW, &tp);
1057
1058         fprintf(stdout, "Enter password for %s: ", host);
1059         fflush(stdout);
1060         tcflow(0, TCOOFF);
1061         retval = scanf("%79s", pwd);
1062         tcflow(0, TCOON);
1063         fprintf(stdout, "\n");
1064
1065         tcsetattr(0, TCSANOW, &old);
1066
1067         strncpy(buf, pwd, len);
1068         buf[len-1] = '\0';
1069 }
1070
1071 static int find_urls(const char *tweet, int **pranges)
1072 {
1073         /*
1074          * magic obtained from
1075          * http://www.geekpedia.com/KB65_How-to-validate-an-URL-using-RegEx-in-Csharp.html
1076          */
1077         static const char *re_magic =
1078                 "(([a-zA-Z][0-9a-zA-Z+\\-\\.]*:)/{1,3}"
1079                 "[0-9a-zA-Z;/~?:@&=+$\\.\\-_'()%]+)"
1080                 "(#[0-9a-zA-Z;/?:@&=+$\\.\\-_!~*'()%]+)?";
1081         pcre *re;
1082         const char *errptr;
1083         int erroffset;
1084         int ovector[10] = {0,};
1085         const size_t ovsize = sizeof(ovector)/sizeof(*ovector);
1086         int startoffset, tweetlen;
1087         int i, rc;
1088         int rbound = 10;
1089         int rcount = 0;
1090         int *ranges = malloc(sizeof(int) * rbound);
1091
1092         re = pcre_compile(re_magic,
1093                         PCRE_NO_AUTO_CAPTURE,
1094                         &errptr, &erroffset, NULL);
1095         if (!re) {
1096                 fprintf(stderr, "pcre_compile @%u: %s\n", erroffset, errptr);
1097                 exit(1);
1098         }
1099
1100         tweetlen = strlen(tweet);
1101         for (startoffset = 0; startoffset < tweetlen; ) {
1102
1103                 rc = pcre_exec(re, NULL, tweet, strlen(tweet), startoffset, 0,
1104                                 ovector, ovsize);
1105                 if (rc == PCRE_ERROR_NOMATCH)
1106                         break;
1107
1108                 if (rc < 0) {
1109                         fprintf(stderr, "pcre_exec @%u: %s\n",
1110                                 erroffset, errptr);
1111                         exit(1);
1112                 }
1113
1114                 for (i = 0; i < rc; i += 2) {
1115                         if ((rcount+2) == rbound) {
1116                                 rbound *= 2;
1117                                 ranges = realloc(ranges, sizeof(int) * rbound);
1118                         }
1119
1120                         ranges[rcount++] = ovector[i];
1121                         ranges[rcount++] = ovector[i+1];
1122                 }
1123
1124                 startoffset = ovector[1];
1125         }
1126
1127         pcre_free(re);
1128
1129         *pranges = ranges;
1130         return rcount;
1131 }
1132
1133 /**
1134  * bidirectional popen() call
1135  *
1136  * @param rwepipe - int array of size three
1137  * @param exe - program to run
1138  * @param argv - argument list
1139  * @return pid or -1 on error
1140  *
1141  * The caller passes in an array of three integers (rwepipe), on successful
1142  * execution it can then write to element 0 (stdin of exe), and read from
1143  * element 1 (stdout) and 2 (stderr).
1144  */
1145 static int popenRWE(int *rwepipe, const char *exe, const char *const argv[])
1146 {
1147         int in[2];
1148         int out[2];
1149         int err[2];
1150         int pid;
1151         int rc;
1152
1153         rc = pipe(in);
1154         if (rc < 0)
1155                 goto error_in;
1156
1157         rc = pipe(out);
1158         if (rc < 0)
1159                 goto error_out;
1160
1161         rc = pipe(err);
1162         if (rc < 0)
1163                 goto error_err;
1164
1165         pid = fork();
1166         if (pid > 0) {
1167                 /* parent */
1168                 close(in[0]);
1169                 close(out[1]);
1170                 close(err[1]);
1171                 rwepipe[0] = in[1];
1172                 rwepipe[1] = out[0];
1173                 rwepipe[2] = err[0];
1174                 return pid;
1175         } else if (pid == 0) {
1176                 /* child */
1177                 close(in[1]);
1178                 close(out[0]);
1179                 close(err[0]);
1180                 close(0);
1181                 rc = dup(in[0]);
1182                 close(1);
1183                 rc = dup(out[1]);
1184                 close(2);
1185                 rc = dup(err[1]);
1186
1187                 execvp(exe, (char **)argv);
1188                 exit(1);
1189         } else
1190                 goto error_fork;
1191
1192         return pid;
1193
1194 error_fork:
1195         close(err[0]);
1196         close(err[1]);
1197 error_err:
1198         close(out[0]);
1199         close(out[1]);
1200 error_out:
1201         close(in[0]);
1202         close(in[1]);
1203 error_in:
1204         return -1;
1205 }
1206
1207 static int pcloseRWE(int pid, int *rwepipe)
1208 {
1209         int rc, status;
1210         close(rwepipe[0]);
1211         close(rwepipe[1]);
1212         close(rwepipe[2]);
1213         rc = waitpid(pid, &status, 0);
1214         return status;
1215 }
1216
1217 static char *shrink_one_url(int *rwepipe, char *big)
1218 {
1219         int biglen = strlen(big);
1220         char *small;
1221         int smalllen;
1222         int rc;
1223
1224         rc = dprintf(rwepipe[0], "%s\n", big);
1225         if (rc < 0)
1226                 return big;
1227
1228         smalllen = biglen + 128;
1229         small = malloc(smalllen);
1230         if (!small)
1231                 return big;
1232
1233         rc = read(rwepipe[1], small, smalllen);
1234         if (rc < 0 || rc > biglen)
1235                 goto error_free_small;
1236
1237         if (strncmp(small, "http://", 7))
1238                 goto error_free_small;
1239
1240         smalllen = rc;
1241         while (smalllen && isspace(small[smalllen-1]))
1242                         small[--smalllen] = 0;
1243
1244         free(big);
1245         return small;
1246
1247 error_free_small:
1248         free(small);
1249         return big;
1250 }
1251
1252 static char *shrink_urls(char *text)
1253 {
1254         int *ranges;
1255         int rcount;
1256         int i;
1257         int inofs = 0;
1258         int outofs = 0;
1259         const char *const shrink_args[] = {
1260                 "bti-shrink-urls",
1261                 NULL
1262         };
1263         int shrink_pid;
1264         int shrink_pipe[3];
1265         int inlen = strlen(text);
1266
1267         dbg("before len=%u\n", inlen);
1268
1269         shrink_pid = popenRWE(shrink_pipe, shrink_args[0], shrink_args);
1270         if (shrink_pid < 0)
1271                 return text;
1272
1273         rcount = find_urls(text, &ranges);
1274         if (!rcount)
1275                 return text;
1276
1277         for (i = 0; i < rcount; i += 2) {
1278                 int url_start = ranges[i];
1279                 int url_end = ranges[i+1];
1280                 int long_url_len = url_end - url_start;
1281                 char *url = strndup(text + url_start, long_url_len);
1282                 int short_url_len;
1283                 int not_url_len = url_start - inofs;
1284
1285                 dbg("long  url[%u]: %s\n", long_url_len, url);
1286                 url = shrink_one_url(shrink_pipe, url);
1287                 short_url_len = url ? strlen(url) : 0;
1288                 dbg("short url[%u]: %s\n", short_url_len, url);
1289
1290                 if (!url || short_url_len >= long_url_len) {
1291                         /* The short url ended up being too long
1292                          * or unavailable */
1293                         if (inofs) {
1294                                 strncpy(text + outofs, text + inofs,
1295                                                 not_url_len + long_url_len);
1296                         }
1297                         inofs += not_url_len + long_url_len;
1298                         outofs += not_url_len + long_url_len;
1299
1300                 } else {
1301                         /* copy the unmodified block */
1302                         strncpy(text + outofs, text + inofs, not_url_len);
1303                         inofs += not_url_len;
1304                         outofs += not_url_len;
1305
1306                         /* copy the new url */
1307                         strncpy(text + outofs, url, short_url_len);
1308                         inofs += long_url_len;
1309                         outofs += short_url_len;
1310                 }
1311
1312                 free(url);
1313         }
1314
1315         /* copy the last block after the last match */
1316         if (inofs) {
1317                 int tail = inlen - inofs;
1318                 if (tail) {
1319                         strncpy(text + outofs, text + inofs, tail);
1320                         outofs += tail;
1321                 }
1322         }
1323
1324         free(ranges);
1325
1326         (void)pcloseRWE(shrink_pid, shrink_pipe);
1327
1328         text[outofs] = 0;
1329         dbg("after len=%u\n", outofs);
1330         return text;
1331 }
1332
1333 int main(int argc, char *argv[], char *envp[])
1334 {
1335         static const struct option options[] = {
1336                 { "debug", 0, NULL, 'd' },
1337                 { "verbose", 0, NULL, 'V' },
1338                 { "account", 1, NULL, 'a' },
1339                 { "password", 1, NULL, 'p' },
1340                 { "host", 1, NULL, 'H' },
1341                 { "proxy", 1, NULL, 'P' },
1342                 { "action", 1, NULL, 'A' },
1343                 { "user", 1, NULL, 'u' },
1344                 { "group", 1, NULL, 'G' },
1345                 { "logfile", 1, NULL, 'L' },
1346                 { "shrink-urls", 0, NULL, 's' },
1347                 { "help", 0, NULL, 'h' },
1348                 { "bash", 0, NULL, 'b' },
1349                 { "background", 0, NULL, 'B' },
1350                 { "dry-run", 0, NULL, 'n' },
1351                 { "page", 1, NULL, 'g' },
1352                 { "version", 0, NULL, 'v' },
1353                 { "config", 1, NULL, 'c' },
1354                 { "replyto", 1, NULL, 'r' },
1355                 { "retweet", 1, NULL, 'w' },
1356                 { }
1357         };
1358         struct session *session;
1359         pid_t child;
1360         char *tweet;
1361         char *retweet;
1362         static char password[80];
1363         int retval = 0;
1364         int option;
1365         char *http_proxy;
1366         time_t t;
1367         int page_nr;
1368
1369         debug = 0;
1370         verbose = 0;
1371
1372         session = session_alloc();
1373         if (!session) {
1374                 fprintf(stderr, "no more memory...\n");
1375                 return -1;
1376         }
1377
1378         /* get the current time so that we can log it later */
1379         time(&t);
1380         session->time = strdup(ctime(&t));
1381         session->time[strlen(session->time)-1] = 0x00;
1382
1383         /* Get the home directory so we can try to find a config file */
1384         session->homedir = strdup(getenv("HOME"));
1385
1386         /* set up a default config file location (traditionally ~/.bti) */
1387         session->configfile = zalloc(strlen(session->homedir) + 7);
1388         sprintf(session->configfile, "%s/.bti", session->homedir);
1389
1390         /* Set environment variables first, before reading command line options
1391          * or config file values. */
1392         http_proxy = getenv("http_proxy");
1393         if (http_proxy) {
1394                 if (session->proxy)
1395                         free(session->proxy);
1396                 session->proxy = strdup(http_proxy);
1397                 dbg("http_proxy = %s\n", session->proxy);
1398         }
1399
1400         parse_configfile(session);
1401
1402         while (1) {
1403                 option = getopt_long_only(argc, argv,
1404                                           "dp:P:H:a:A:u:c:hg:G:sr:nVv",
1405                                           options, NULL);
1406                 if (option == -1)
1407                         break;
1408                 switch (option) {
1409                 case 'd':
1410                         debug = 1;
1411                         break;
1412                 case 'V':
1413                         verbose = 1;
1414                         break;
1415                 case 'a':
1416                         if (session->account)
1417                                 free(session->account);
1418                         session->account = strdup(optarg);
1419                         dbg("account = %s\n", session->account);
1420                         break;
1421                 case 'g':
1422                         page_nr = atoi(optarg);
1423                         dbg("page = %d\n", page_nr);
1424                         session->page = page_nr;
1425                         break;
1426                 case 'r':
1427                         session->replyto = strdup(optarg);
1428                         dbg("in_reply_to_status_id = %s\n", session->replyto);
1429                         break;
1430                 case 'w':
1431                         session->retweet = strdup(optarg);
1432                         dbg("Retweet ID = %s\n", session->retweet);
1433                         break;
1434                 case 'p':
1435                         if (session->password)
1436                                 free(session->password);
1437                         session->password = strdup(optarg);
1438                         dbg("password = %s\n", session->password);
1439                         break;
1440                 case 'P':
1441                         if (session->proxy)
1442                                 free(session->proxy);
1443                         session->proxy = strdup(optarg);
1444                         dbg("proxy = %s\n", session->proxy);
1445                         break;
1446                 case 'A':
1447                         if (strcasecmp(optarg, "update") == 0)
1448                                 session->action = ACTION_UPDATE;
1449                         else if (strcasecmp(optarg, "friends") == 0)
1450                                 session->action = ACTION_FRIENDS;
1451                         else if (strcasecmp(optarg, "user") == 0)
1452                                 session->action = ACTION_USER;
1453                         else if (strcasecmp(optarg, "replies") == 0)
1454                                 session->action = ACTION_REPLIES;
1455                         else if (strcasecmp(optarg, "public") == 0)
1456                                 session->action = ACTION_PUBLIC;
1457                         else if (strcasecmp(optarg, "group") == 0)
1458                                 session->action = ACTION_GROUP;
1459                         else if (strcasecmp(optarg,"retweet") == 0)
1460                                 session->action = ACTION_RETWEET;
1461                         else
1462                                 session->action = ACTION_UNKNOWN;
1463                         dbg("action = %d\n", session->action);
1464                         break;
1465                 case 'u':
1466                         if (session->user)
1467                                 free(session->user);
1468                         session->user = strdup(optarg);
1469                         dbg("user = %s\n", session->user);
1470                         break;
1471
1472                 case 'G':
1473                         if (session->group)
1474                                 free(session->group);
1475                         session->group = strdup(optarg);
1476                         dbg("group = %s\n", session->group);
1477                         break;
1478                 case 'L':
1479                         if (session->logfile)
1480                                 free(session->logfile);
1481                         session->logfile = strdup(optarg);
1482                         dbg("logfile = %s\n", session->logfile);
1483                         break;
1484                 case 's':
1485                         session->shrink_urls = 1;
1486                         break;
1487                 case 'H':
1488                         if (session->hosturl)
1489                                 free(session->hosturl);
1490                         if (session->hostname)
1491                                 free(session->hostname);
1492                         if (strcasecmp(optarg, "twitter") == 0) {
1493                                 session->host = HOST_TWITTER;
1494                                 session->hosturl = strdup(twitter_host);
1495                                 session->hostname = strdup(twitter_name);
1496                         } else if (strcasecmp(optarg, "identica") == 0) {
1497                                 session->host = HOST_IDENTICA;
1498                                 session->hosturl = strdup(identica_host);
1499                                 session->hostname = strdup(identica_name);
1500                         } else {
1501                                 session->host = HOST_CUSTOM;
1502                                 session->hosturl = strdup(optarg);
1503                                 session->hostname = strdup(optarg);
1504                         }
1505                         dbg("host = %d\n", session->host);
1506                         break;
1507                 case 'b':
1508                         session->bash = 1;
1509                         /* fall-through intended */
1510                 case 'B':
1511                         session->background = 1;
1512                         break;
1513                 case 'c':
1514                         if (session->configfile)
1515                                 free(session->configfile);
1516                         session->configfile = strdup(optarg);
1517                         dbg("configfile = %s\n", session->configfile);
1518
1519                         /*
1520                          * read the config file now.  Yes, this could override
1521                          * previously set options from the command line, but
1522                          * the user asked for it...
1523                          */
1524                         parse_configfile(session);
1525                         break;
1526                 case 'h':
1527                         display_help();
1528                         goto exit;
1529                 case 'n':
1530                         session->dry_run = 1;
1531                         break;
1532                 case 'v':
1533                         display_version();
1534                         goto exit;
1535                 default:
1536                         display_help();
1537                         goto exit;
1538                 }
1539         }
1540
1541         session_readline_init(session);
1542         /*
1543          * Show the version to make it easier to determine what
1544          * is going on here
1545          */
1546         if (debug)
1547                 display_version();
1548
1549         if (session->host == HOST_TWITTER) {
1550                 if (!session->consumer_key || !session->consumer_secret) {
1551                         if (session->action == ACTION_USER ||
1552                                         session->action == ACTION_PUBLIC) {
1553                                 /* Some actions may still work without authentication */
1554                                 session->guest = 1;
1555                         } else {
1556                                 fprintf(stderr,
1557                                                 "Twitter no longer supports HTTP basic authentication.\n"
1558                                                 "Both consumer key, and consumer secret are required"
1559                                                 " for bti in order to behave as an OAuth consumer.\n");
1560                                 goto exit;
1561                         }
1562                 }
1563                 if (session->action == ACTION_GROUP) {
1564                         fprintf(stderr, "Groups only work in Identi.ca.\n");
1565                         goto exit;
1566                 }
1567         } else {
1568                 if (!session->consumer_key || !session->consumer_secret)
1569                         session->no_oauth = 1;
1570         }
1571
1572         if (session->no_oauth) {
1573                 if (!session->account) {
1574                         fprintf(stdout, "Enter account for %s: ",
1575                                 session->hostname);
1576                         session->account = session->readline(NULL);
1577                 }
1578                 if (!session->password) {
1579                         read_password(password, sizeof(password),
1580                                       session->hostname);
1581                         session->password = strdup(password);
1582                 }
1583         } else if (!session->guest) {
1584                 if (!session->access_token_key ||
1585                     !session->access_token_secret) {
1586                         request_access_token(session);
1587                         goto exit;
1588                 }
1589         }
1590
1591         if (session->action == ACTION_UNKNOWN) {
1592                 fprintf(stderr, "Unknown action, valid actions are:\n"
1593                         "'update', 'friends', 'public', 'replies', 'group' or 'user'.\n");
1594                 goto exit;
1595         }
1596
1597         if (session->action == ACTION_GROUP && !session->group) {
1598                 fprintf(stdout, "Enter group name: ");
1599                 session->group = session->readline(NULL);
1600         }
1601
1602         if (session->action == ACTION_RETWEET) {
1603                 fprintf(stdout, "Status ID to retweet: ");
1604                 retweet = get_string_from_stdin();
1605
1606                 if (!retweet || strlen(retweet) == 0) {
1607                         dbg("no retweet?\n");
1608                         return -1;
1609                 }
1610
1611                 session->retweet = zalloc(strlen(retweet) + 10);
1612                 sprintf(session->retweet,"%s", retweet);
1613                 free(retweet);
1614                 dbg("retweet ID = %s\n", session->retweet);
1615         }
1616
1617         if (session->action == ACTION_UPDATE) {
1618                 if (session->background || !session->interactive)
1619                         tweet = get_string_from_stdin();
1620                 else
1621                         tweet = session->readline("tweet: ");
1622                 if (!tweet || strlen(tweet) == 0) {
1623                         dbg("no tweet?\n");
1624                         return -1;
1625                 }
1626
1627                 if (session->shrink_urls)
1628                         tweet = shrink_urls(tweet);
1629
1630                 session->tweet = zalloc(strlen(tweet) + 10);
1631                 if (session->bash)
1632                         sprintf(session->tweet, "%c %s",
1633                                 getuid() ? '$' : '#', tweet);
1634                 else
1635                         sprintf(session->tweet, "%s", tweet);
1636
1637                 free(tweet);
1638                 dbg("tweet = %s\n", session->tweet);
1639         }
1640
1641         if (session->page == 0)
1642                 session->page = 1;
1643         dbg("config file = %s\n", session->configfile);
1644         dbg("host = %d\n", session->host);
1645         dbg("action = %d\n", session->action);
1646
1647         /* fork ourself so that the main shell can get on
1648          * with it's life as we try to connect and handle everything
1649          */
1650         if (session->background) {
1651                 child = fork();
1652                 if (child) {
1653                         dbg("child is %d\n", child);
1654                         exit(0);
1655                 }
1656         }
1657
1658         retval = send_request(session);
1659         if (retval && !session->background)
1660                 fprintf(stderr, "operation failed\n");
1661
1662         log_session(session, retval);
1663 exit:
1664         session_readline_cleanup(session);
1665         session_free(session);
1666         return retval;;
1667 }