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) &&
 459                     !strncmp(rv[1], "oauth_token_secret=", 18)) {
 460                         if (token)
 461                                 *token = strdup(&(rv[0][12]));
 462                         if (secret)
 463                                 *secret = strdup(&(rv[1][19]));
 464
 465                         retval = 0;
 466                 }
 467         } else if (rc == 3) {
 468                 if (!strncmp(rv[1], "oauth_token=", 11) &&
 469                     !strncmp(rv[2], "oauth_token_secret=", 18)) {
 470                         if (token)
 471                                 *token = strdup(&(rv[1][12]));
 472                         if (secret)
 473                                 *secret = strdup(&(rv[2][19]));
 474
 475                         retval = 0;
 476                 }
 477         }
 478
 479         dbg("token: %s\n", *token);
 480         dbg("secret: %s\n", *secret);
 481
 482         if (rv)
 483                 free(rv);
 484
 485         return retval;
 486 }
 487
 488 static int request_access_token(struct session *session)
 489 {
 490         char *post_params = NULL;
 491         char *request_url = NULL;
 492         char *reply    = NULL;
 493         char *at_key      = NULL;
 494         char *at_secret   = NULL;
 495         char *verifier    = NULL;
 496         char at_uri[90];
 497
 498         if (!session)
 499                 return -EINVAL;
 500
 501         if (session->host == HOST_TWITTER)
 502                 request_url = oauth_sign_url2(
 503                                 twitter_request_token_uri, NULL,
 504                                 OA_HMAC, NULL, session->consumer_key,
 505                                 session->consumer_secret, NULL, NULL);
 506         else if (session->host == HOST_IDENTICA)
 507                 request_url = oauth_sign_url2(
 508                                 identica_request_token_uri, NULL,
 509                                 OA_HMAC, NULL, session->consumer_key,
 510                                 session->consumer_secret, NULL, NULL);
 511         reply = oauth_http_get(request_url, post_params);
 512
 513         if (request_url)
 514                 free(request_url);
 515
 516         if (post_params)
 517                 free(post_params);
 518
 519         if (!reply)
 520                 return 1;
 521
 522         if (parse_osp_reply(reply, &at_key, &at_secret))
 523                 return 1;
 524
 525         free(reply);
 526
 527         fprintf(stdout, "Please open the following link in your browser, and ");
 528         fprintf(stdout, "allow 'bti' to access your account. Then paste ");
 529         fprintf(stdout, "back the provided PIN in here.\n");
 530         if (session->host == HOST_TWITTER) {
 531                 fprintf(stdout, "%s%s\nPIN: ", twitter_authorize_uri, at_key);
 532                 verifier = session->readline(NULL);
 533                 sprintf(at_uri, "%s?oauth_verifier=%s",
 534                         twitter_access_token_uri, verifier);
 535         } else if (session->host == HOST_IDENTICA) {
 536                 fprintf(stdout, "%s%s\nPIN: ", identica_authorize_uri, at_key);
 537                 verifier = session->readline(NULL);
 538                 sprintf(at_uri, "%s?oauth_verifier=%s",
 539                         identica_access_token_uri, verifier);
 540         }
 541         request_url = oauth_sign_url2(at_uri, NULL, OA_HMAC, NULL,
 542                                       session->consumer_key,
 543                                       session->consumer_secret,
 544                                       at_key, at_secret);
 545         reply = oauth_http_get(request_url, post_params);
 546
 547         if (!reply)
 548                 return 1;
 549
 550         if (parse_osp_reply(reply, &at_key, &at_secret))
 551                 return 1;
 552
 553         free(reply);
 554
 555         fprintf(stdout, "Please put these two lines in your bti ");
 556         fprintf(stdout, "configuration file (~/.bti):\n");
 557         fprintf(stdout, "access_token_key=%s\n", at_key);
 558         fprintf(stdout, "access_token_secret=%s\n", at_secret);
 559
 560         return 0;
 561 }
 562
 563 static int send_request(struct session *session)
 564 {
 565         char endpoint[500];
 566         char user_password[500];
 567         char data[500];
 568         struct bti_curl_buffer *curl_buf;
 569         CURL *curl = NULL;
 570         CURLcode res;
 571         struct curl_httppost *formpost = NULL;
 572         struct curl_httppost *lastptr = NULL;
 573         struct curl_slist *slist = NULL;
 574         char *req_url = NULL;
 575         char *reply = NULL;
 576         char *postarg = NULL;
 577         char *escaped_tweet = NULL;
 578         int is_post = 0;
 579
 580         if (!session)
 581                 return -EINVAL;
 582
 583         if (!session->hosturl)
 584                 session->hosturl = strdup(twitter_host);
 585
 586         if (session->no_oauth) {
 587                 curl_buf = bti_curl_buffer_alloc(session->action);
 588                 if (!curl_buf)
 589                         return -ENOMEM;
 590
 591                 curl = curl_init();
 592                 if (!curl)
 593                         return -EINVAL;
 594
 595                 if (!session->hosturl)
 596                         session->hosturl = strdup(twitter_host);
 597
 598                 switch (session->action) {
 599                 case ACTION_UPDATE:
 600                         snprintf(user_password, sizeof(user_password), "%s:%s",
 601                                  session->account, session->password);
 602                         snprintf(data, sizeof(data), "status=\"%s\"",
 603                                  session->tweet);
 604                         curl_formadd(&formpost, &lastptr,
 605                                      CURLFORM_COPYNAME, "status",
 606                                      CURLFORM_COPYCONTENTS, session->tweet,
 607                                      CURLFORM_END);
 608
 609                         curl_formadd(&formpost, &lastptr,
 610                                      CURLFORM_COPYNAME, "source",
 611                                      CURLFORM_COPYCONTENTS, "bti",
 612                                      CURLFORM_END);
 613
 614                         if (session->replyto)
 615                                 curl_formadd(&formpost, &lastptr,
 616                                              CURLFORM_COPYNAME, "in_reply_to_status_id",
 617                                              CURLFORM_COPYCONTENTS, session->replyto,
 618                                              CURLFORM_END);
 619
 620                         curl_easy_setopt(curl, CURLOPT_HTTPPOST, formpost);
 621                         slist = curl_slist_append(slist, "Expect:");
 622                         curl_easy_setopt(curl, CURLOPT_HTTPHEADER, slist);
 623
 624                         sprintf(endpoint, "%s%s", session->hosturl, update_uri);
 625                         curl_easy_setopt(curl, CURLOPT_URL, endpoint);
 626                         curl_easy_setopt(curl, CURLOPT_USERPWD, user_password);
 627                         break;
 628
 629                 case ACTION_FRIENDS:
 630                         snprintf(user_password, sizeof(user_password), "%s:%s",
 631                                  session->account, session->password);
 632                         sprintf(endpoint, "%s%s?page=%d", session->hosturl,
 633                                         friends_uri, session->page);
 634                         curl_easy_setopt(curl, CURLOPT_URL, endpoint);
 635                         curl_easy_setopt(curl, CURLOPT_USERPWD, user_password);
 636                         break;
 637
 638                 case ACTION_USER:
 639                         sprintf(endpoint, "%s%s%s.xml?page=%d", session->hosturl,
 640                                 user_uri, session->user, session->page);
 641                         curl_easy_setopt(curl, CURLOPT_URL, endpoint);
 642                         break;
 643
 644                 case ACTION_REPLIES:
 645                         snprintf(user_password, sizeof(user_password), "%s:%s",
 646                                  session->account, session->password);
 647                         sprintf(endpoint, "%s%s?page=%d", session->hosturl,
 648                                 replies_uri, session->page);
 649                         curl_easy_setopt(curl, CURLOPT_URL, endpoint);
 650                         curl_easy_setopt(curl, CURLOPT_USERPWD, user_password);
 651                         break;
 652
 653                 case ACTION_PUBLIC:
 654                         sprintf(endpoint, "%s%s?page=%d", session->hosturl,
 655                                 public_uri, session->page);
 656                         curl_easy_setopt(curl, CURLOPT_URL, endpoint);
 657                         break;
 658
 659                 case ACTION_GROUP:
 660                         sprintf(endpoint, "%s%s%s.xml?page=%d",
 661                                 session->hosturl, group_uri, session->group,
 662                                 session->page);
 663                         curl_easy_setopt(curl, CURLOPT_URL, endpoint);
 664                         break;
 665
 666                 default:
 667                         break;
 668                 }
 669
 670                 if (session->proxy)
 671                         curl_easy_setopt(curl, CURLOPT_PROXY, session->proxy);
 672
 673                 if (debug)
 674                         curl_easy_setopt(curl, CURLOPT_VERBOSE, 1);
 675
 676                 dbg("user_password = %s\n", user_password);
 677                 dbg("data = %s\n", data);
 678                 dbg("proxy = %s\n", session->proxy);
 679
 680                 curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, curl_callback);
 681                 curl_easy_setopt(curl, CURLOPT_WRITEDATA, curl_buf);
 682                 if (!session->dry_run) {
 683                         res = curl_easy_perform(curl);
 684                         if (res && !session->bash) {
 685                                 fprintf(stderr, "error(%d) trying to perform "
 686                                                 "operation\n", res);
 687                                 return -EINVAL;
 688                         }
 689                 }
 690
 691                 curl_easy_cleanup(curl);
 692                 if (session->action == ACTION_UPDATE)
 693                         curl_formfree(formpost);
 694                 bti_curl_buffer_free(curl_buf);
 695         } else {
 696                 switch (session->action) {
 697                 case ACTION_UPDATE:
 698                         escaped_tweet = oauth_url_escape(session->tweet);
 699                         sprintf(endpoint, "%s%s?status=%s", session->hosturl,
 700                                 update_uri, escaped_tweet);
 701                         is_post = 1;
 702                         break;
 703                 case ACTION_USER:
 704                         sprintf(endpoint, "%s%s%s.xml?page=%d",
 705                                 session->hosturl, user_uri, session->user,
 706                                 session->page);
 707                         break;
 708                 case ACTION_REPLIES:
 709                         sprintf(endpoint, "%s%s?page=%d", session->hosturl,
 710                                 mentions_uri, session->page);
 711                         break;
 712                 case ACTION_PUBLIC:
 713                         sprintf(endpoint, "%s%s?page=%d", session->hosturl,
 714                                 public_uri, session->page);
 715                         break;
 716                 case ACTION_GROUP:
 717                         sprintf(endpoint, "%s%s%s.xml?page=%d",
 718                                 session->hosturl, group_uri, session->group,
 719                                 session->page);
 720                         break;
 721                 case ACTION_FRIENDS:
 722                         sprintf(endpoint, "%s%s?page=%d", session->hosturl,
 723                                 friends_uri, session->page);
 724                         break;
 725                 default:
 726                         break;
 727                 }
 728
 729                 if (is_post) {
 730                         req_url = oauth_sign_url2(endpoint, &postarg, OA_HMAC,
 731                                                   NULL, session->consumer_key,
 732                                                   session->consumer_secret,
 733                                                   session->access_token_key,
 734                                                   session->access_token_secret);
 735                         reply = oauth_http_post(req_url, postarg);
 736                 } else {
 737                         req_url = oauth_sign_url2(endpoint, NULL, OA_HMAC, NULL,
 738                                                   session->consumer_key,
 739                                                   session->consumer_secret,
 740                                                   session->access_token_key,
 741                                                   session->access_token_secret);
 742                         reply = oauth_http_get(req_url, postarg);
 743                 }
 744
 745                 dbg("%s\n", req_url);
 746                 dbg("%s\n", reply);
 747                 if (req_url)
 748                         free(req_url);
 749
 750                 if (session->action != ACTION_UPDATE)
 751                         parse_timeline(reply);
 752         }
 753         return 0;
 754 }
 755
 756 static void parse_configfile(struct session *session)
 757 {
 758         FILE *config_file;
 759         char *line = NULL;
 760         size_t len = 0;
 761         char *account = NULL;
 762         char *password = NULL;
 763         char *consumer_key = NULL;
 764         char *consumer_secret = NULL;
 765         char *access_token_key = NULL;
 766         char *access_token_secret = NULL;
 767         char *host = NULL;
 768         char *proxy = NULL;
 769         char *logfile = NULL;
 770         char *action = NULL;
 771         char *user = NULL;
 772         char *replyto = NULL;
 773         int shrink_urls = 0;
 774
 775         config_file = fopen(session->configfile, "r");
 776
 777         /* No error if file does not exist or is unreadable.  */
 778         if (config_file == NULL)
 779                 return;
 780
 781         do {
 782                 ssize_t n = getline(&line, &len, config_file);
 783                 if (n < 0)
 784                         break;
 785                 if (line[n - 1] == '\n')
 786                         line[n - 1] = '\0';
 787                 /* Parse file.  Format is the usual value pairs:
 788                    account=name
 789                    passwort=value
 790                    # is a comment character
 791                 */
 792                 *strchrnul(line, '#') = '\0';
 793                 char *c = line;
 794                 while (isspace(*c))
 795                         c++;
 796                 /* Ignore blank lines.  */
 797                 if (c[0] == '\0')
 798                         continue;
 799
 800                 if (!strncasecmp(c, "account", 7) && (c[7] == '=')) {
 801                         c += 8;
 802                         if (c[0] != '\0')
 803                                 account = strdup(c);
 804                 } else if (!strncasecmp(c, "password", 8) &&
 805                            (c[8] == '=')) {
 806                         c += 9;
 807                         if (c[0] != '\0')
 808                                 password = strdup(c);
 809                 } else if (!strncasecmp(c, "consumer_key", 12) &&
 810                            (c[12] == '=')) {
 811                         c += 13;
 812                         if (c[0] != '\0')
 813                                 consumer_key = strdup(c);
 814                 } else if (!strncasecmp(c, "consumer_secret", 15) &&
 815                            (c[15] == '=')) {
 816                         c += 16;
 817                         if (c[0] != '\0')
 818                                 consumer_secret = strdup(c);
 819                 } else if (!strncasecmp(c, "access_token_key", 16) &&
 820                            (c[16] == '=')) {
 821                         c += 17;
 822                         if (c[0] != '\0')
 823                                 access_token_key = strdup(c);
 824                 } else if (!strncasecmp(c, "access_token_secret", 19) &&
 825                            (c[19] == '=')) {
 826                         c += 20;
 827                         if (c[0] != '\0')
 828                                 access_token_secret = strdup(c);
 829                 } else if (!strncasecmp(c, "host", 4) &&
 830                            (c[4] == '=')) {
 831                         c += 5;
 832                         if (c[0] != '\0')
 833                                 host = strdup(c);
 834                 } else if (!strncasecmp(c, "proxy", 5) &&
 835                            (c[5] == '=')) {
 836                         c += 6;
 837                         if (c[0] != '\0')
 838                                 proxy = strdup(c);
 839                 } else if (!strncasecmp(c, "logfile", 7) &&
 840                            (c[7] == '=')) {
 841                         c += 8;
 842                         if (c[0] != '\0')
 843                                 logfile = strdup(c);
 844                 } else if (!strncasecmp(c, "replyto", 7) &&
 845                            (c[7] == '=')) {
 846                         c += 8;
 847                         if (c[0] != '\0')
 848                                 replyto = strdup(c);
 849                 } else if (!strncasecmp(c, "action", 6) &&
 850                            (c[6] == '=')) {
 851                         c += 7;
 852                         if (c[0] != '\0')
 853                                 action = strdup(c);
 854                 } else if (!strncasecmp(c, "user", 4) &&
 855                                 (c[4] == '=')) {
 856                         c += 5;
 857                         if (c[0] != '\0')
 858                                 user = strdup(c);
 859                 } else if (!strncasecmp(c, "shrink-urls", 11) &&
 860                                 (c[11] == '=')) {
 861                         c += 12;
 862                         if (!strncasecmp(c, "true", 4) ||
 863                                         !strncasecmp(c, "yes", 3))
 864                                 shrink_urls = 1;
 865                 } else if (!strncasecmp(c, "verbose", 7) &&
 866                                 (c[7] == '=')) {
 867                         c += 8;
 868                         if (!strncasecmp(c, "true", 4) ||
 869                                         !strncasecmp(c, "yes", 3))
 870                                 verbose = 1;
 871                 }
 872         } while (!feof(config_file));
 873
 874         if (password)
 875                 session->password = password;
 876         if (account)
 877                 session->account = account;
 878         if (consumer_key)
 879                 session->consumer_key = consumer_key;
 880         if (consumer_secret)
 881                 session->consumer_secret = consumer_secret;
 882         if (access_token_key)
 883                 session->access_token_key = access_token_key;
 884         if (access_token_secret)
 885                 session->access_token_secret = access_token_secret;
 886         if (host) {
 887                 if (strcasecmp(host, "twitter") == 0) {
 888                         session->host = HOST_TWITTER;
 889                         session->hosturl = strdup(twitter_host);
 890                         session->hostname = strdup(twitter_name);
 891                 } else if (strcasecmp(host, "identica") == 0) {
 892                         session->host = HOST_IDENTICA;
 893                         session->hosturl = strdup(identica_host);
 894                         session->hostname = strdup(identica_name);
 895                 } else {
 896                         session->host = HOST_CUSTOM;
 897                         session->hosturl = strdup(host);
 898                         session->hostname = strdup(host);
 899                 }
 900                 free(host);
 901         }
 902         if (proxy) {
 903                 if (session->proxy)
 904                         free(session->proxy);
 905                 session->proxy = proxy;
 906         }
 907         if (logfile)
 908                 session->logfile = logfile;
 909         if (replyto)
 910                 session->replyto = replyto;
 911         if (action) {
 912                 if (strcasecmp(action, "update") == 0)
 913                         session->action = ACTION_UPDATE;
 914                 else if (strcasecmp(action, "friends") == 0)
 915                         session->action = ACTION_FRIENDS;
 916                 else if (strcasecmp(action, "user") == 0)
 917                         session->action = ACTION_USER;
 918                 else if (strcasecmp(action, "replies") == 0)
 919                         session->action = ACTION_REPLIES;
 920                 else if (strcasecmp(action, "public") == 0)
 921                         session->action = ACTION_PUBLIC;
 922                 else if (strcasecmp(action, "group") == 0)
 923                         session->action = ACTION_GROUP;
 924                 else
 925                         session->action = ACTION_UNKNOWN;
 926                 free(action);
 927         }
 928         if (user)
 929                 session->user = user;
 930         session->shrink_urls = shrink_urls;
 931
 932         /* Free buffer and close file.  */
 933         free(line);
 934         fclose(config_file);
 935 }
 936
 937 static void log_session(struct session *session, int retval)
 938 {
 939         FILE *log_file;
 940         char *filename;
 941
 942         /* Only log something if we have a log file set */
 943         if (!session->logfile)
 944                 return;
 945
 946         filename = alloca(strlen(session->homedir) +
 947                           strlen(session->logfile) + 3);
 948
 949         sprintf(filename, "%s/%s", session->homedir, session->logfile);
 950
 951         log_file = fopen(filename, "a+");
 952         if (log_file == NULL)
 953                 return;
 954
 955         switch (session->action) {
 956         case ACTION_UPDATE:
 957                 if (retval)
 958                         fprintf(log_file, "%s: host=%s tweet failed\n",
 959                                 session->time, session->hostname);
 960                 else
 961                         fprintf(log_file, "%s: host=%s tweet=%s\n",
 962                                 session->time, session->hostname,
 963                                 session->tweet);
 964                 break;
 965         case ACTION_FRIENDS:
 966                 fprintf(log_file, "%s: host=%s retrieving friends timeline\n",
 967                         session->time, session->hostname);
 968                 break;
 969         case ACTION_USER:
 970                 fprintf(log_file, "%s: host=%s retrieving %s's timeline\n",
 971                         session->time, session->hostname, session->user);
 972                 break;
 973         case ACTION_REPLIES:
 974                 fprintf(log_file, "%s: host=%s retrieving replies\n",
 975                         session->time, session->hostname);
 976                 break;
 977         case ACTION_PUBLIC:
 978                 fprintf(log_file, "%s: host=%s retrieving public timeline\n",
 979                         session->time, session->hostname);
 980                 break;
 981         case ACTION_GROUP:
 982                 fprintf(log_file, "%s: host=%s retrieving group timeline\n",
 983                         session->time, session->hostname);
 984                 break;
 985         default:
 986                 break;
 987         }
 988
 989         fclose(log_file);
 990 }
 991
 992 static char *get_string_from_stdin(void)
 993 {
 994         char *temp;
 995         char *string;
 996
 997         string = zalloc(1000);
 998         if (!string)
 999                 return NULL;
1000
1001         if (!fgets(string, 999, stdin))
1002                 return NULL;
1003         temp = strchr(string, '\n');
1004         if (temp)
1005                 *temp = '\0';
1006         return string;
1007 }
1008
1009 static void read_password(char *buf, size_t len, char *host)
1010 {
1011         char pwd[80];
1012         int retval;
1013         struct termios old;
1014         struct termios tp;
1015
1016         tcgetattr(0, &tp);
1017         old = tp;
1018
1019         tp.c_lflag &= (~ECHO);
1020         tcsetattr(0, TCSANOW, &tp);
1021
1022         fprintf(stdout, "Enter password for %s: ", host);
1023         fflush(stdout);
1024         tcflow(0, TCOOFF);
1025         retval = scanf("%79s", pwd);
1026         tcflow(0, TCOON);
1027         fprintf(stdout, "\n");
1028
1029         tcsetattr(0, TCSANOW, &old);
1030
1031         strncpy(buf, pwd, len);
1032         buf[len-1] = '\0';
1033 }
1034
1035 static int find_urls(const char *tweet, int **pranges)
1036 {
1037         /*
1038          * magic obtained from
1039          * http://www.geekpedia.com/KB65_How-to-validate-an-URL-using-RegEx-in-Csharp.html
1040          */
1041         static const char *re_magic =
1042                 "(([a-zA-Z][0-9a-zA-Z+\\-\\.]*:)/{1,3}"
1043                 "[0-9a-zA-Z;/~?:@&=+$\\.\\-_'()%]+)"
1044                 "(#[0-9a-zA-Z;/?:@&=+$\\.\\-_!~*'()%]+)?";
1045         pcre *re;
1046         const char *errptr;
1047         int erroffset;
1048         int ovector[10] = {0,};
1049         const size_t ovsize = sizeof(ovector)/sizeof(*ovector);
1050         int startoffset, tweetlen;
1051         int i, rc;
1052         int rbound = 10;
1053         int rcount = 0;
1054         int *ranges = malloc(sizeof(int) * rbound);
1055
1056         re = pcre_compile(re_magic,
1057                         PCRE_NO_AUTO_CAPTURE,
1058                         &errptr, &erroffset, NULL);
1059         if (!re) {
1060                 fprintf(stderr, "pcre_compile @%u: %s\n", erroffset, errptr);
1061                 exit(1);
1062         }
1063
1064         tweetlen = strlen(tweet);
1065         for (startoffset = 0; startoffset < tweetlen; ) {
1066
1067                 rc = pcre_exec(re, NULL, tweet, strlen(tweet), startoffset, 0,
1068                                 ovector, ovsize);
1069                 if (rc == PCRE_ERROR_NOMATCH)
1070                         break;
1071
1072                 if (rc < 0) {
1073                         fprintf(stderr, "pcre_exec @%u: %s\n",
1074                                 erroffset, errptr);
1075                         exit(1);
1076                 }
1077
1078                 for (i = 0; i < rc; i += 2) {
1079                         if ((rcount+2) == rbound) {
1080                                 rbound *= 2;
1081                                 ranges = realloc(ranges, sizeof(int) * rbound);
1082                         }
1083
1084                         ranges[rcount++] = ovector[i];
1085                         ranges[rcount++] = ovector[i+1];
1086                 }
1087
1088                 startoffset = ovector[1];
1089         }
1090
1091         pcre_free(re);
1092
1093         *pranges = ranges;
1094         return rcount;
1095 }
1096
1097 /**
1098  * bidirectional popen() call
1099  *
1100  * @param rwepipe - int array of size three
1101  * @param exe - program to run
1102  * @param argv - argument list
1103  * @return pid or -1 on error
1104  *
1105  * The caller passes in an array of three integers (rwepipe), on successful
1106  * execution it can then write to element 0 (stdin of exe), and read from
1107  * element 1 (stdout) and 2 (stderr).
1108  */
1109 static int popenRWE(int *rwepipe, const char *exe, const char *const argv[])
1110 {
1111         int in[2];
1112         int out[2];
1113         int err[2];
1114         int pid;
1115         int rc;
1116
1117         rc = pipe(in);
1118         if (rc < 0)
1119                 goto error_in;
1120
1121         rc = pipe(out);
1122         if (rc < 0)
1123                 goto error_out;
1124
1125         rc = pipe(err);
1126         if (rc < 0)
1127                 goto error_err;
1128
1129         pid = fork();
1130         if (pid > 0) {
1131                 /* parent */
1132                 close(in[0]);
1133                 close(out[1]);
1134                 close(err[1]);
1135                 rwepipe[0] = in[1];
1136                 rwepipe[1] = out[0];
1137                 rwepipe[2] = err[0];
1138                 return pid;
1139         } else if (pid == 0) {
1140                 /* child */
1141                 close(in[1]);
1142                 close(out[0]);
1143                 close(err[0]);
1144                 close(0);
1145                 rc = dup(in[0]);
1146                 close(1);
1147                 rc = dup(out[1]);
1148                 close(2);
1149                 rc = dup(err[1]);
1150
1151                 execvp(exe, (char **)argv);
1152                 exit(1);
1153         } else
1154                 goto error_fork;
1155
1156         return pid;
1157
1158 error_fork:
1159         close(err[0]);
1160         close(err[1]);
1161 error_err:
1162         close(out[0]);
1163         close(out[1]);
1164 error_out:
1165         close(in[0]);
1166         close(in[1]);
1167 error_in:
1168         return -1;
1169 }
1170
1171 static int pcloseRWE(int pid, int *rwepipe)
1172 {
1173         int rc, status;
1174         close(rwepipe[0]);
1175         close(rwepipe[1]);
1176         close(rwepipe[2]);
1177         rc = waitpid(pid, &status, 0);
1178         return status;
1179 }
1180
1181 static char *shrink_one_url(int *rwepipe, char *big)
1182 {
1183         int biglen = strlen(big);
1184         char *small;
1185         int smalllen;
1186         int rc;
1187
1188         rc = dprintf(rwepipe[0], "%s\n", big);
1189         if (rc < 0)
1190                 return big;
1191
1192         smalllen = biglen + 128;
1193         small = malloc(smalllen);
1194         if (!small)
1195                 return big;
1196
1197         rc = read(rwepipe[1], small, smalllen);
1198         if (rc < 0 || rc > biglen)
1199                 goto error_free_small;
1200
1201         if (strncmp(small, "http://", 7))
1202                 goto error_free_small;
1203
1204         smalllen = rc;
1205         while (smalllen && isspace(small[smalllen-1]))
1206                         small[--smalllen] = 0;
1207
1208         free(big);
1209         return small;
1210
1211 error_free_small:
1212         free(small);
1213         return big;
1214 }
1215
1216 static char *shrink_urls(char *text)
1217 {
1218         int *ranges;
1219         int rcount;
1220         int i;
1221         int inofs = 0;
1222         int outofs = 0;
1223         const char *const shrink_args[] = {
1224                 "bti-shrink-urls",
1225                 NULL
1226         };
1227         int shrink_pid;
1228         int shrink_pipe[3];
1229         int inlen = strlen(text);
1230
1231         dbg("before len=%u\n", inlen);
1232
1233         shrink_pid = popenRWE(shrink_pipe, shrink_args[0], shrink_args);
1234         if (shrink_pid < 0)
1235                 return text;
1236
1237         rcount = find_urls(text, &ranges);
1238         if (!rcount)
1239                 return text;
1240
1241         for (i = 0; i < rcount; i += 2) {
1242                 int url_start = ranges[i];
1243                 int url_end = ranges[i+1];
1244                 int long_url_len = url_end - url_start;
1245                 char *url = strndup(text + url_start, long_url_len);
1246                 int short_url_len;
1247                 int not_url_len = url_start - inofs;
1248
1249                 dbg("long  url[%u]: %s\n", long_url_len, url);
1250                 url = shrink_one_url(shrink_pipe, url);
1251                 short_url_len = url ? strlen(url) : 0;
1252                 dbg("short url[%u]: %s\n", short_url_len, url);
1253
1254                 if (!url || short_url_len >= long_url_len) {
1255                         /* The short url ended up being too long
1256                          * or unavailable */
1257                         if (inofs) {
1258                                 strncpy(text + outofs, text + inofs,
1259                                                 not_url_len + long_url_len);
1260                         }
1261                         inofs += not_url_len + long_url_len;
1262                         outofs += not_url_len + long_url_len;
1263
1264                 } else {
1265                         /* copy the unmodified block */
1266                         strncpy(text + outofs, text + inofs, not_url_len);
1267                         inofs += not_url_len;
1268                         outofs += not_url_len;
1269
1270                         /* copy the new url */
1271                         strncpy(text + outofs, url, short_url_len);
1272                         inofs += long_url_len;
1273                         outofs += short_url_len;
1274                 }
1275
1276                 free(url);
1277         }
1278
1279         /* copy the last block after the last match */
1280         if (inofs) {
1281                 int tail = inlen - inofs;
1282                 if (tail) {
1283                         strncpy(text + outofs, text + inofs, tail);
1284                         outofs += tail;
1285                 }
1286         }
1287
1288         free(ranges);
1289
1290         (void)pcloseRWE(shrink_pid, shrink_pipe);
1291
1292         text[outofs] = 0;
1293         dbg("after len=%u\n", outofs);
1294         return text;
1295 }
1296
1297 int main(int argc, char *argv[], char *envp[])
1298 {
1299         static const struct option options[] = {
1300                 { "debug", 0, NULL, 'd' },
1301                 { "verbose", 0, NULL, 'V' },
1302                 { "account", 1, NULL, 'a' },
1303                 { "password", 1, NULL, 'p' },
1304                 { "host", 1, NULL, 'H' },
1305                 { "proxy", 1, NULL, 'P' },
1306                 { "action", 1, NULL, 'A' },
1307                 { "user", 1, NULL, 'u' },
1308                 { "group", 1, NULL, 'G' },
1309                 { "logfile", 1, NULL, 'L' },
1310                 { "shrink-urls", 0, NULL, 's' },
1311                 { "help", 0, NULL, 'h' },
1312                 { "bash", 0, NULL, 'b' },
1313                 { "dry-run", 0, NULL, 'n' },
1314                 { "page", 1, NULL, 'g' },
1315                 { "version", 0, NULL, 'v' },
1316                 { "config", 1, NULL, 'c' },
1317                 { "replyto", 1, NULL, 'r' },
1318                 { }
1319         };
1320         struct session *session;
1321         pid_t child;
1322         char *tweet;
1323         static char password[80];
1324         int retval = 0;
1325         int option;
1326         char *http_proxy;
1327         time_t t;
1328         int page_nr;
1329
1330         debug = 0;
1331         verbose = 0;
1332
1333         session = session_alloc();
1334         if (!session) {
1335                 fprintf(stderr, "no more memory...\n");
1336                 return -1;
1337         }
1338
1339         /* get the current time so that we can log it later */
1340         time(&t);
1341         session->time = strdup(ctime(&t));
1342         session->time[strlen(session->time)-1] = 0x00;
1343
1344         /* Get the home directory so we can try to find a config file */
1345         session->homedir = strdup(getenv("HOME"));
1346
1347         /* set up a default config file location (traditionally ~/.bti) */
1348         session->configfile = zalloc(strlen(session->homedir) + 7);
1349         sprintf(session->configfile, "%s/.bti", session->homedir);
1350
1351         /* Set environment variables first, before reading command line options
1352          * or config file values. */
1353         http_proxy = getenv("http_proxy");
1354         if (http_proxy) {
1355                 if (session->proxy)
1356                         free(session->proxy);
1357                 session->proxy = strdup(http_proxy);
1358                 dbg("http_proxy = %s\n", session->proxy);
1359         }
1360
1361         parse_configfile(session);
1362
1363         while (1) {
1364                 option = getopt_long_only(argc, argv,
1365                                           "dp:P:H:a:A:u:c:hg:G:sr:nVv",
1366                                           options, NULL);
1367                 if (option == -1)
1368                         break;
1369                 switch (option) {
1370                 case 'd':
1371                         debug = 1;
1372                         break;
1373                 case 'V':
1374                         verbose = 1;
1375                         break;
1376                 case 'a':
1377                         if (session->account)
1378                                 free(session->account);
1379                         session->account = strdup(optarg);
1380                         dbg("account = %s\n", session->account);
1381                         break;
1382                 case 'g':
1383                         page_nr = atoi(optarg);
1384                         dbg("page = %d\n", page_nr);
1385                         session->page = page_nr;
1386                         break;
1387                 case 'r':
1388                         session->replyto = strdup(optarg);
1389                         dbg("in_reply_to_status_id = %s\n", session->replyto);
1390                         break;
1391                 case 'p':
1392                         if (session->password)
1393                                 free(session->password);
1394                         session->password = strdup(optarg);
1395                         dbg("password = %s\n", session->password);
1396                         break;
1397                 case 'P':
1398                         if (session->proxy)
1399                                 free(session->proxy);
1400                         session->proxy = strdup(optarg);
1401                         dbg("proxy = %s\n", session->proxy);
1402                         break;
1403                 case 'A':
1404                         if (strcasecmp(optarg, "update") == 0)
1405                                 session->action = ACTION_UPDATE;
1406                         else if (strcasecmp(optarg, "friends") == 0)
1407                                 session->action = ACTION_FRIENDS;
1408                         else if (strcasecmp(optarg, "user") == 0)
1409                                 session->action = ACTION_USER;
1410                         else if (strcasecmp(optarg, "replies") == 0)
1411                                 session->action = ACTION_REPLIES;
1412                         else if (strcasecmp(optarg, "public") == 0)
1413                                 session->action = ACTION_PUBLIC;
1414                         else if (strcasecmp(optarg, "group") == 0)
1415                                 session->action = ACTION_GROUP;
1416                         else
1417                                 session->action = ACTION_UNKNOWN;
1418                         dbg("action = %d\n", session->action);
1419                         break;
1420                 case 'u':
1421                         if (session->user)
1422                                 free(session->user);
1423                         session->user = strdup(optarg);
1424                         dbg("user = %s\n", session->user);
1425                         break;
1426
1427                 case 'G':
1428                         if (session->group)
1429                                 free(session->group);
1430                         session->group = strdup(optarg);
1431                         dbg("group = %s\n", session->group);
1432                         break;
1433                 case 'L':
1434                         if (session->logfile)
1435                                 free(session->logfile);
1436                         session->logfile = strdup(optarg);
1437                         dbg("logfile = %s\n", session->logfile);
1438                         break;
1439                 case 's':
1440                         session->shrink_urls = 1;
1441                         break;
1442                 case 'H':
1443                         if (session->hosturl)
1444                                 free(session->hosturl);
1445                         if (session->hostname)
1446                                 free(session->hostname);
1447                         if (strcasecmp(optarg, "twitter") == 0) {
1448                                 session->host = HOST_TWITTER;
1449                                 session->hosturl = strdup(twitter_host);
1450                                 session->hostname = strdup(twitter_name);
1451                         } else if (strcasecmp(optarg, "identica") == 0) {
1452                                 session->host = HOST_IDENTICA;
1453                                 session->hosturl = strdup(identica_host);
1454                                 session->hostname = strdup(identica_name);
1455                         } else {
1456                                 session->host = HOST_CUSTOM;
1457                                 session->hosturl = strdup(optarg);
1458                                 session->hostname = strdup(optarg);
1459                         }
1460                         dbg("host = %d\n", session->host);
1461                         break;
1462                 case 'b':
1463                         session->bash = 1;
1464                         break;
1465                 case 'c':
1466                         if (session->configfile)
1467                                 free(session->configfile);
1468                         session->configfile = strdup(optarg);
1469                         dbg("configfile = %s\n", session->configfile);
1470
1471                         /*
1472                          * read the config file now.  Yes, this could override
1473                          * previously set options from the command line, but
1474                          * the user asked for it...
1475                          */
1476                         parse_configfile(session);
1477                         break;
1478                 case 'h':
1479                         display_help();
1480                         goto exit;
1481                 case 'n':
1482                         session->dry_run = 1;
1483                         break;
1484                 case 'v':
1485                         display_version();
1486                         goto exit;
1487                 default:
1488                         display_help();
1489                         goto exit;
1490                 }
1491         }
1492
1493         session_readline_init(session);
1494         /*
1495          * Show the version to make it easier to determine what
1496          * is going on here
1497          */
1498         if (debug)
1499                 display_version();
1500
1501         if (session->host == HOST_TWITTER) {
1502                 if (!session->consumer_key || !session->consumer_secret) {
1503                         fprintf(stderr, "Twitter no longer supuports HTTP basic authentication.\n");
1504                         fprintf(stderr, "Both consumer key, and consumer secret are required");
1505                         fprintf(stderr, " for bti in order to behave as an OAuth consumer.\n");
1506                         goto exit;
1507                 }
1508                 if (session->action == ACTION_GROUP) {
1509                         fprintf(stderr, "Groups only work in Identi.ca.\n");
1510                         goto exit;
1511                 }
1512         } else {
1513                 if (!session->consumer_key || !session->consumer_secret)
1514                         session->no_oauth = 1;
1515         }
1516
1517         if (session->no_oauth) {
1518                 if (!session->account) {
1519                         fprintf(stdout, "Enter account for %s: ",
1520                                 session->hostname);
1521                         session->account = session->readline(NULL);
1522                 }
1523                 if (!session->password) {
1524                         read_password(password, sizeof(password),
1525                                       session->hostname);
1526                         session->password = strdup(password);
1527                 }
1528         } else {
1529                 if (!session->access_token_key ||
1530                     !session->access_token_secret) {
1531                         request_access_token(session);
1532                         goto exit;
1533                 }
1534         }
1535
1536         if (session->action == ACTION_UNKNOWN) {
1537                 fprintf(stderr, "Unknown action, valid actions are:\n");
1538                 fprintf(stderr, "'update', 'friends', 'public', "
1539                         "'replies', 'group' or 'user'.\n");
1540                 goto exit;
1541         }
1542
1543         if (session->action == ACTION_GROUP && !session->group) {
1544                 fprintf(stdout, "Enter group name: ");
1545                 session->group = session->readline(NULL);
1546         }
1547
1548         if (session->action == ACTION_UPDATE) {
1549                 if (session->bash || !session->interactive)
1550                         tweet = get_string_from_stdin();
1551                 else
1552                         tweet = session->readline("tweet: ");
1553                 if (!tweet || strlen(tweet) == 0) {
1554                         dbg("no tweet?\n");
1555                         return -1;
1556                 }
1557
1558                 if (session->shrink_urls)
1559                         tweet = shrink_urls(tweet);
1560
1561                 session->tweet = zalloc(strlen(tweet) + 10);
1562                 if (session->bash)
1563                         sprintf(session->tweet, "%c %s",
1564                                 getuid() ? '$' : '#', tweet);
1565                 else
1566                         sprintf(session->tweet, "%s", tweet);
1567
1568                 free(tweet);
1569                 dbg("tweet = %s\n", session->tweet);
1570         }
1571
1572         if (session->page == 0)
1573                 session->page = 1;
1574         dbg("config file = %s\n", session->configfile);
1575         dbg("host = %d\n", session->host);
1576         dbg("action = %d\n", session->action);
1577
1578         /* fork ourself so that the main shell can get on
1579          * with it's life as we try to connect and handle everything
1580          */
1581         if (session->bash) {
1582                 child = fork();
1583                 if (child) {
1584                         dbg("child is %d\n", child);
1585                         exit(0);
1586                 }
1587         }
1588
1589         retval = send_request(session);
1590         if (retval && !session->bash)
1591                 fprintf(stderr, "operation failed\n");
1592
1593         log_session(session, retval);
1594 exit:
1595         session_readline_cleanup(session);
1596         session_free(session);
1597         return retval;;
1598 }