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