bti.c

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