bti.c

   1 /*
   2  * Copyright (C) 2008-2011 Greg Kroah-Hartman <greg@kroah.com>
   3  * Copyright (C) 2009 Bart Trojanowski <bart@jukie.net>
   4  * Copyright (C) 2009-2010 Amir Mohammad Saied <amirsaied@gmail.com>
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License as published by the
   8  * Free Software Foundation version 2 of the License.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  18  */
  19
  20 #define _GNU_SOURCE
  21
  22 #include <stdio.h>
  23 #include <stdlib.h>
  24 #include <stddef.h>
  25 #include <string.h>
  26 #include <getopt.h>
  27 #include <errno.h>
  28 #include <ctype.h>
  29 #include <fcntl.h>
  30 #include <unistd.h>
  31 #include <time.h>
  32 #include <sys/stat.h>
  33 #include <sys/types.h>
  34 #include <sys/wait.h>
  35 #include <curl/curl.h>
  36 #include <libxml/xmlmemory.h>
  37 #include <libxml/parser.h>
  38 #include <libxml/tree.h>
  39 #include <pcre.h>
  40 #include <termios.h>
  41 #include <dlfcn.h>
  42 #include <oauth.h>
  43 #include "bti.h"
  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 int debug;
  56
  57 static void display_help(void)
  58 {
  59         fprintf(stdout, "bti - send tweet to twitter or identi.ca\n"
  60                 "Version: %s\n"
  61                 "Usage:\n"
  62                 "  bti [options]\n"
  63                 "options are:\n"
  64                 "  --account accountname\n"
  65                 "  --password password\n"
  66                 "  --action action\n"
  67                 "    ('update', 'friends', 'public', 'replies', or 'user')\n"
  68                 "  --user screenname\n"
  69                 "  --group groupname\n"
  70                 "  --proxy PROXY:PORT\n"
  71                 "  --host HOST\n"
  72                 "  --logfile logfile\n"
  73                 "  --config configfile\n"
  74                 "  --replyto ID\n"
  75                 "  --retweet ID\n"
  76                 "  --shrink-urls\n"
  77                 "  --page PAGENUMBER\n"
  78                 "  --column COLUMNWIDTH\n"
  79                 "  --bash\n"
  80                 "  --background\n"
  81                 "  --debug\n"
  82                 "  --verbose\n"
  83                 "  --dry-run\n"
  84                 "  --version\n"
  85                 "  --help\n", VERSION);
  86 }
  87
  88 static void display_version(void)
  89 {
  90         fprintf(stdout, "bti - version %s\n", VERSION);
  91 }
  92
  93 static char *get_string(const char *name)
  94 {
  95         char *temp;
  96         char *string;
  97
  98         string = zalloc(1000);
  99         if (!string)
 100                 exit(1);
 101         if (name != NULL)
 102                 fprintf(stdout, "%s", name);
 103         if (!fgets(string, 999, stdin)) {
 104                 free(string);
 105                 return NULL;
 106         }
 107         temp = strchr(string, '\n');
 108         if (temp)
 109                 *temp = '\0';
 110         return string;
 111 }
 112
 113 /*
 114  * Try to get a handle to a readline function from a variety of different
 115  * libraries.  If nothing is present on the system, then fall back to an
 116  * internal one.
 117  *
 118  * Logic originally based off of code in the e2fsutils package in the
 119  * lib/ss/get_readline.c file, which is licensed under the MIT license.
 120  *
 121  * This keeps us from having to relicense the bti codebase if readline
 122  * ever changes its license, as there is no link-time dependency.
 123  * It is a run-time thing only, and we handle any readline-like library
 124  * in the same manner, making bti not be a derivative work of any
 125  * other program.
 126  */
 127 static void session_readline_init(struct session *session)
 128 {
 129         /* Libraries we will try to use for readline/editline functionality */
 130         const char *libpath = "libreadline.so.6:libreadline.so.5:"
 131                                 "libreadline.so.4:libreadline.so:libedit.so.2:"
 132                                 "libedit.so:libeditline.so.0:libeditline.so";
 133         void *handle = NULL;
 134         char *tmp, *cp, *next;
 135         int (*bind_key)(int, void *);
 136         void (*insert)(void);
 137
 138         /* default to internal function if we can't or won't find anything */
 139         session->readline = get_string;
 140         if (!isatty(0))
 141                 return;
 142         session->interactive = 1;
 143
 144         tmp = malloc(strlen(libpath)+1);
 145         if (!tmp)
 146                 return;
 147         strcpy(tmp, libpath);
 148         for (cp = tmp; cp; cp = next) {
 149                 next = strchr(cp, ':');
 150                 if (next)
 151                         *next++ = 0;
 152                 if (*cp == 0)
 153                         continue;
 154                 handle = dlopen(cp, RTLD_NOW);
 155                 if (handle) {
 156                         dbg("Using %s for readline library\n", cp);
 157                         break;
 158                 }
 159         }
 160         free(tmp);
 161         if (!handle) {
 162                 dbg("No readline library found.\n");
 163                 return;
 164         }
 165
 166         session->readline_handle = handle;
 167         session->readline = (char *(*)(const char *))dlsym(handle, "readline");
 168         if (session->readline == NULL) {
 169                 /* something odd happened, default back to internal stuff */
 170                 session->readline_handle = NULL;
 171                 session->readline = get_string;
 172                 return;
 173         }
 174
 175         /*
 176          * If we found a library, turn off filename expansion
 177          * as that makes no sense from within bti.
 178          */
 179         bind_key = (int (*)(int, void *))dlsym(handle, "rl_bind_key");
 180         insert = (void (*)(void))dlsym(handle, "rl_insert");
 181         if (bind_key && insert)
 182                 bind_key('\t', insert);
 183 }
 184
 185 static void session_readline_cleanup(struct session *session)
 186 {
 187         if (session->readline_handle)
 188                 dlclose(session->readline_handle);
 189 }
 190
 191 static struct session *session_alloc(void)
 192 {
 193         struct session *session;
 194
 195         session = zalloc(sizeof(*session));
 196         if (!session)
 197                 return NULL;
 198         return session;
 199 }
 200
 201 static void session_free(struct session *session)
 202 {
 203         if (!session)
 204                 return;
 205         free(session->retweet);
 206         free(session->replyto);
 207         free(session->password);
 208         free(session->account);
 209         free(session->consumer_key);
 210         free(session->consumer_secret);
 211         free(session->access_token_key);
 212         free(session->access_token_secret);
 213         free(session->tweet);
 214         free(session->proxy);
 215         free(session->time);
 216         free(session->homedir);
 217         free(session->user);
 218         free(session->group);
 219         free(session->hosturl);
 220         free(session->hostname);
 221         free(session->configfile);
 222         free(session);
 223 }
 224
 225 static struct bti_curl_buffer *bti_curl_buffer_alloc(enum action action)
 226 {
 227         struct bti_curl_buffer *buffer;
 228
 229         buffer = zalloc(sizeof(*buffer));
 230         if (!buffer)
 231                 return NULL;
 232
 233         /* start out with a data buffer of 1 byte to
 234          * make the buffer fill logic simpler */
 235         buffer->data = zalloc(1);
 236         if (!buffer->data) {
 237                 free(buffer);
 238                 return NULL;
 239         }
 240         buffer->length = 0;
 241         buffer->action = action;
 242         return buffer;
 243 }
 244
 245 static void bti_curl_buffer_free(struct bti_curl_buffer *buffer)
 246 {
 247         if (!buffer)
 248                 return;
 249         free(buffer->data);
 250         free(buffer);
 251 }
 252
 253 const char twitter_host[]  = "http://api.twitter.com/1/statuses";
 254 const char identica_host[] = "https://identi.ca/api/statuses";
 255 const char twitter_name[]  = "twitter";
 256 const char identica_name[] = "identi.ca";
 257
 258 static const char twitter_request_token_uri[]  = "http://twitter.com/oauth/request_token";
 259 static const char twitter_access_token_uri[]   = "http://twitter.com/oauth/access_token";
 260 static const char twitter_authorize_uri[]      = "http://twitter.com/oauth/authorize?oauth_token=";
 261 static const char identica_request_token_uri[] = "https://identi.ca/api/oauth/request_token?oauth_callback=oob";
 262 static const char identica_access_token_uri[]  = "https://identi.ca/api/oauth/access_token";
 263 static const char identica_authorize_uri[]     = "https://identi.ca/api/oauth/authorize?oauth_token=";
 264
 265 static const char user_uri[]     = "/user_timeline/";
 266 static const char update_uri[]   = "/update.xml";
 267 static const char public_uri[]   = "/public_timeline.xml";
 268 static const char friends_uri[]  = "/friends_timeline.xml";
 269 static const char mentions_uri[] = "/mentions.xml";
 270 static const char replies_uri[]  = "/replies.xml";
 271 static const char retweet_uri[]  = "/retweet/";
 272 static const char group_uri[]    = "/../statusnet/groups/timeline/";
 273
 274 static const char config_default[]      = "/etc/bti";
 275 static const char config_user_default[] = ".bti";
 276
 277 static CURL *curl_init(void)
 278 {
 279         CURL *curl;
 280
 281         curl = curl_easy_init();
 282         if (!curl) {
 283                 fprintf(stderr, "Can not init CURL!\n");
 284                 return NULL;
 285         }
 286         /* some ssl sanity checks on the connection we are making */
 287         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0);
 288         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0);
 289         return curl;
 290 }
 291
 292 /* The final place data is sent to the screen/pty/tty */
 293 static void bti_output_line(struct session *session, xmlChar *user,
 294                             xmlChar *id, xmlChar *created, xmlChar *text)
 295 {
 296         if (session->verbose)
 297                 printf("[%*s] {%s} (%.16s) %s\n", -session->column_output, user,
 298                                 id, created, text);
 299         else
 300                 printf("[%*s] %s\n", -session->column_output, user, text);
 301 }
 302
 303 static void parse_statuses(struct session *session,
 304                            xmlDocPtr doc, xmlNodePtr current)
 305 {
 306         xmlChar *text = NULL;
 307         xmlChar *user = NULL;
 308         xmlChar *created = NULL;
 309         xmlChar *id = NULL;
 310         xmlNodePtr userinfo;
 311
 312         current = current->xmlChildrenNode;
 313         while (current != NULL) {
 314                 if (current->type == XML_ELEMENT_NODE) {
 315                         if (!xmlStrcmp(current->name, (const xmlChar *)"created_at"))
 316                                 created = xmlNodeListGetString(doc, current->xmlChildrenNode, 1);
 317                         if (!xmlStrcmp(current->name, (const xmlChar *)"text"))
 318                                 text = xmlNodeListGetString(doc, current->xmlChildrenNode, 1);
 319                         if (!xmlStrcmp(current->name, (const xmlChar *)"id"))
 320                                 id = xmlNodeListGetString(doc, current->xmlChildrenNode, 1);
 321                         if (!xmlStrcmp(current->name, (const xmlChar *)"user")) {
 322                                 userinfo = current->xmlChildrenNode;
 323                                 while (userinfo != NULL) {
 324                                         if ((!xmlStrcmp(userinfo->name, (const xmlChar *)"screen_name"))) {
 325                                                 if (user)
 326                                                         xmlFree(user);
 327                                                 user = xmlNodeListGetString(doc, userinfo->xmlChildrenNode, 1);
 328                                         }
 329                                         userinfo = userinfo->next;
 330                                 }
 331                         }
 332
 333                         if (user && text && created && id) {
 334                                 bti_output_line(session, user, id,
 335                                                 created, text);
 336                                 xmlFree(user);
 337                                 xmlFree(text);
 338                                 xmlFree(created);
 339                                 xmlFree(id);
 340                                 user = NULL;
 341                                 text = NULL;
 342                                 created = NULL;
 343                                 id = NULL;
 344                         }
 345                 }
 346                 current = current->next;
 347         }
 348
 349         return;
 350 }
 351
 352 static void parse_timeline(char *document, struct session *session)
 353 {
 354         xmlDocPtr doc;
 355         xmlNodePtr current;
 356
 357         doc = xmlReadMemory(document, strlen(document), "timeline.xml",
 358                             NULL, XML_PARSE_NOERROR);
 359         if (doc == NULL)
 360                 return;
 361
 362         current = xmlDocGetRootElement(doc);
 363         if (current == NULL) {
 364                 fprintf(stderr, "empty document\n");
 365                 xmlFreeDoc(doc);
 366                 return;
 367         }
 368
 369         if (xmlStrcmp(current->name, (const xmlChar *) "statuses")) {
 370                 fprintf(stderr, "unexpected document type\n");
 371                 xmlFreeDoc(doc);
 372                 return;
 373         }
 374
 375         current = current->xmlChildrenNode;
 376         while (current != NULL) {
 377                 if ((!xmlStrcmp(current->name, (const xmlChar *)"status")))
 378                         parse_statuses(session, doc, current);
 379                 current = current->next;
 380         }
 381         xmlFreeDoc(doc);
 382
 383         return;
 384 }
 385
 386 static size_t curl_callback(void *buffer, size_t size, size_t nmemb,
 387                             void *userp)
 388 {
 389         struct bti_curl_buffer *curl_buf = userp;
 390         size_t buffer_size = size * nmemb;
 391         char *temp;
 392
 393         if ((!buffer) || (!buffer_size) || (!curl_buf))
 394                 return -EINVAL;
 395
 396         /* add to the data we already have */
 397         temp = zalloc(curl_buf->length + buffer_size + 1);
 398         if (!temp)
 399                 return -ENOMEM;
 400
 401         memcpy(temp, curl_buf->data, curl_buf->length);
 402         free(curl_buf->data);
 403         curl_buf->data = temp;
 404         memcpy(&curl_buf->data[curl_buf->length], (char *)buffer, buffer_size);
 405         curl_buf->length += buffer_size;
 406         if (curl_buf->action)
 407                 parse_timeline(curl_buf->data, curl_buf->session);
 408
 409         dbg("%s\n", curl_buf->data);
 410
 411         return buffer_size;
 412 }
 413
 414 static int parse_osp_reply(const char *reply, char **token, char **secret)
 415 {
 416         int rc;
 417         int retval = 1;
 418         char **rv = NULL;
 419         rc = oauth_split_url_parameters(reply, &rv);
 420         qsort(rv, rc, sizeof(char *), oauth_cmpstringp);
 421         if (rc == 2 || rc == 4) {
 422                 if (!strncmp(rv[0], "oauth_token=", 11) &&
 423                     !strncmp(rv[1], "oauth_token_secret=", 18)) {
 424                         if (token)
 425                                 *token = strdup(&(rv[0][12]));
 426                         if (secret)
 427                                 *secret = strdup(&(rv[1][19]));
 428
 429                         retval = 0;
 430                 }
 431         } else if (rc == 3) {
 432                 if (!strncmp(rv[1], "oauth_token=", 11) &&
 433                     !strncmp(rv[2], "oauth_token_secret=", 18)) {
 434                         if (token)
 435                                 *token = strdup(&(rv[1][12]));
 436                         if (secret)
 437                                 *secret = strdup(&(rv[2][19]));
 438
 439                         retval = 0;
 440                 }
 441         }
 442
 443         dbg("token: %s\n", *token);
 444         dbg("secret: %s\n", *secret);
 445
 446         if (rv)
 447                 free(rv);
 448
 449         return retval;
 450 }
 451
 452 static int request_access_token(struct session *session)
 453 {
 454         char *post_params = NULL;
 455         char *request_url = NULL;
 456         char *reply       = NULL;
 457         char *at_key      = NULL;
 458         char *at_secret   = NULL;
 459         char *verifier    = NULL;
 460         char at_uri[90];
 461
 462         if (!session)
 463                 return -EINVAL;
 464
 465         if (session->host == HOST_TWITTER)
 466                 request_url = oauth_sign_url2(
 467                                 twitter_request_token_uri, NULL,
 468                                 OA_HMAC, NULL, session->consumer_key,
 469                                 session->consumer_secret, NULL, NULL);
 470         else if (session->host == HOST_IDENTICA)
 471                 request_url = oauth_sign_url2(
 472                                 identica_request_token_uri, NULL,
 473                                 OA_HMAC, NULL, session->consumer_key,
 474                                 session->consumer_secret, NULL, NULL);
 475         reply = oauth_http_get(request_url, post_params);
 476
 477         if (request_url)
 478                 free(request_url);
 479
 480         if (post_params)
 481                 free(post_params);
 482
 483         if (!reply)
 484                 return 1;
 485
 486         if (parse_osp_reply(reply, &at_key, &at_secret))
 487                 return 1;
 488
 489         free(reply);
 490
 491         fprintf(stdout,
 492                 "Please open the following link in your browser, and "
 493                 "allow 'bti' to access your account. Then paste "
 494                 "back the provided PIN in here.\n");
 495         if (session->host == HOST_TWITTER) {
 496                 fprintf(stdout, "%s%s\nPIN: ", twitter_authorize_uri, at_key);
 497                 verifier = session->readline(NULL);
 498                 sprintf(at_uri, "%s?oauth_verifier=%s",
 499                         twitter_access_token_uri, verifier);
 500         } else if (session->host == HOST_IDENTICA) {
 501                 fprintf(stdout, "%s%s\nPIN: ", identica_authorize_uri, at_key);
 502                 verifier = session->readline(NULL);
 503                 sprintf(at_uri, "%s?oauth_verifier=%s",
 504                         identica_access_token_uri, verifier);
 505         }
 506         request_url = oauth_sign_url2(at_uri, NULL, OA_HMAC, NULL,
 507                                       session->consumer_key,
 508                                       session->consumer_secret,
 509                                       at_key, at_secret);
 510         reply = oauth_http_get(request_url, post_params);
 511
 512         if (!reply)
 513                 return 1;
 514
 515         if (parse_osp_reply(reply, &at_key, &at_secret))
 516                 return 1;
 517
 518         free(reply);
 519
 520         fprintf(stdout,
 521                 "Please put these two lines in your bti "
 522                 "configuration file (%s):\n"
 523                 "access_token_key=%s\n"
 524                 "access_token_secret=%s\n",
 525                 session->configfile, at_key, at_secret);
 526
 527         return 0;
 528 }
 529
 530 static int send_request(struct session *session)
 531 {
 532         char endpoint[500];
 533         char user_password[500];
 534         char data[500];
 535         struct bti_curl_buffer *curl_buf;
 536         CURL *curl = NULL;
 537         CURLcode res;
 538         struct curl_httppost *formpost = NULL;
 539         struct curl_httppost *lastptr = NULL;
 540         struct curl_slist *slist = NULL;
 541         char *req_url = NULL;
 542         char *reply = NULL;
 543         char *postarg = NULL;
 544         char *escaped_tweet = NULL;
 545         int is_post = 0;
 546
 547         if (!session)
 548                 return -EINVAL;
 549
 550         if (!session->hosturl)
 551                 session->hosturl = strdup(twitter_host);
 552
 553         if (session->no_oauth || session->guest) {
 554                 curl_buf = bti_curl_buffer_alloc(session->action);
 555                 if (!curl_buf)
 556                         return -ENOMEM;
 557                 curl_buf->session = session;
 558
 559                 curl = curl_init();
 560                 if (!curl) {
 561                         bti_curl_buffer_free(curl_buf);
 562                         return -EINVAL;
 563                 }
 564
 565                 if (!session->hosturl)
 566                         session->hosturl = strdup(twitter_host);
 567
 568                 switch (session->action) {
 569                 case ACTION_UPDATE:
 570                         snprintf(user_password, sizeof(user_password), "%s:%s",
 571                                  session->account, session->password);
 572                         snprintf(data, sizeof(data), "status=\"%s\"",
 573                                  session->tweet);
 574                         curl_formadd(&formpost, &lastptr,
 575                                      CURLFORM_COPYNAME, "status",
 576                                      CURLFORM_COPYCONTENTS, session->tweet,
 577                                      CURLFORM_END);
 578
 579                         curl_formadd(&formpost, &lastptr,
 580                                      CURLFORM_COPYNAME, "source",
 581                                      CURLFORM_COPYCONTENTS, "bti",
 582                                      CURLFORM_END);
 583
 584                         if (session->replyto)
 585                                 curl_formadd(&formpost, &lastptr,
 586                                              CURLFORM_COPYNAME,
 587                                              "in_reply_to_status_id",
 588                                              CURLFORM_COPYCONTENTS,
 589                                              session->replyto,
 590                                              CURLFORM_END);
 591
 592                         curl_easy_setopt(curl, CURLOPT_HTTPPOST, formpost);
 593                         slist = curl_slist_append(slist, "Expect:");
 594                         curl_easy_setopt(curl, CURLOPT_HTTPHEADER, slist);
 595
 596                         sprintf(endpoint, "%s%s", session->hosturl, update_uri);
 597                         curl_easy_setopt(curl, CURLOPT_URL, endpoint);
 598                         curl_easy_setopt(curl, CURLOPT_USERPWD, user_password);
 599                         break;
 600
 601                 case ACTION_FRIENDS:
 602                         snprintf(user_password, sizeof(user_password), "%s:%s",
 603                                  session->account, session->password);
 604                         sprintf(endpoint, "%s%s?page=%d", session->hosturl,
 605                                         friends_uri, session->page);
 606                         curl_easy_setopt(curl, CURLOPT_URL, endpoint);
 607                         curl_easy_setopt(curl, CURLOPT_USERPWD, user_password);
 608                         break;
 609
 610                 case ACTION_USER:
 611                         sprintf(endpoint, "%s%s%s.xml?page=%d", session->hosturl,
 612                                 user_uri, session->user, session->page);
 613                         curl_easy_setopt(curl, CURLOPT_URL, endpoint);
 614                         break;
 615
 616                 case ACTION_REPLIES:
 617                         snprintf(user_password, sizeof(user_password), "%s:%s",
 618                                  session->account, session->password);
 619                         sprintf(endpoint, "%s%s?page=%d", session->hosturl,
 620                                 replies_uri, session->page);
 621                         curl_easy_setopt(curl, CURLOPT_URL, endpoint);
 622                         curl_easy_setopt(curl, CURLOPT_USERPWD, user_password);
 623                         break;
 624
 625                 case ACTION_PUBLIC:
 626                         sprintf(endpoint, "%s%s?page=%d", session->hosturl,
 627                                 public_uri, session->page);
 628                         curl_easy_setopt(curl, CURLOPT_URL, endpoint);
 629                         break;
 630
 631                 case ACTION_GROUP:
 632                         sprintf(endpoint, "%s%s%s.xml?page=%d",
 633                                 session->hosturl, group_uri, session->group,
 634                                 session->page);
 635                         curl_easy_setopt(curl, CURLOPT_URL, endpoint);
 636                         break;
 637
 638                 default:
 639                         break;
 640                 }
 641
 642                 if (session->proxy)
 643                         curl_easy_setopt(curl, CURLOPT_PROXY, session->proxy);
 644
 645                 if (debug)
 646                         curl_easy_setopt(curl, CURLOPT_VERBOSE, 1);
 647
 648                 dbg("user_password = %s\n", user_password);
 649                 dbg("data = %s\n", data);
 650                 dbg("proxy = %s\n", session->proxy);
 651
 652                 curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, curl_callback);
 653                 curl_easy_setopt(curl, CURLOPT_WRITEDATA, curl_buf);
 654                 if (!session->dry_run) {
 655                         res = curl_easy_perform(curl);
 656                         if (!session->background) {
 657                                 xmlDocPtr doc;
 658                                 xmlNodePtr current;
 659
 660                                 if (res) {
 661                                         fprintf(stderr, "error(%d) trying to "
 662                                                 "perform operation\n", res);
 663                                         curl_easy_cleanup(curl);
 664                                         if (session->action == ACTION_UPDATE)
 665                                                 curl_formfree(formpost);
 666                                         bti_curl_buffer_free(curl_buf);
 667                                         return -EINVAL;
 668                                 }
 669
 670                                 doc = xmlReadMemory(curl_buf->data,
 671                                                     curl_buf->length,
 672                                                     "response.xml", NULL,
 673                                                     XML_PARSE_NOERROR);
 674                                 if (doc == NULL) {
 675                                         curl_easy_cleanup(curl);
 676                                         if (session->action == ACTION_UPDATE)
 677                                                 curl_formfree(formpost);
 678                                         bti_curl_buffer_free(curl_buf);
 679                                         return -EINVAL;
 680                                 }
 681
 682                                 current = xmlDocGetRootElement(doc);
 683                                 if (current == NULL) {
 684                                         fprintf(stderr, "empty document\n");
 685                                         xmlFreeDoc(doc);
 686                                         curl_easy_cleanup(curl);
 687                                         if (session->action == ACTION_UPDATE)
 688                                                 curl_formfree(formpost);
 689                                         bti_curl_buffer_free(curl_buf);
 690                                         return -EINVAL;
 691                                 }
 692
 693                                 if (xmlStrcmp(current->name, (const xmlChar *)"status")) {
 694                                         fprintf(stderr, "unexpected document type\n");
 695                                         xmlFreeDoc(doc);
 696                                         curl_easy_cleanup(curl);
 697                                         if (session->action == ACTION_UPDATE)
 698                                                 curl_formfree(formpost);
 699                                         bti_curl_buffer_free(curl_buf);
 700                                         return -EINVAL;
 701                                 }
 702
 703                                 xmlFreeDoc(doc);
 704                         }
 705                 }
 706
 707                 curl_easy_cleanup(curl);
 708                 if (session->action == ACTION_UPDATE)
 709                         curl_formfree(formpost);
 710                 bti_curl_buffer_free(curl_buf);
 711         } else {
 712                 switch (session->action) {
 713                 case ACTION_UPDATE:
 714                         escaped_tweet = oauth_url_escape(session->tweet);
 715                         if (session->replyto) {
 716                                 sprintf(endpoint,
 717                                         "%s%s?status=%s&in_reply_to_status_id=%s",
 718                                         session->hosturl, update_uri,
 719                                         escaped_tweet, session->replyto);
 720                         } else {
 721                                 sprintf(endpoint, "%s%s?status=%s",
 722                                         session->hosturl, update_uri,
 723                                         escaped_tweet);
 724                         }
 725
 726                         is_post = 1;
 727                         break;
 728                 case ACTION_USER:
 729                         sprintf(endpoint, "%s%s%s.xml?page=%d",
 730                                 session->hosturl, user_uri, session->user,
 731                                 session->page);
 732                         break;
 733                 case ACTION_REPLIES:
 734                         sprintf(endpoint, "%s%s?page=%d", session->hosturl,
 735                                 mentions_uri, session->page);
 736                         break;
 737                 case ACTION_PUBLIC:
 738                         sprintf(endpoint, "%s%s?page=%d", session->hosturl,
 739                                 public_uri, session->page);
 740                         break;
 741                 case ACTION_GROUP:
 742                         sprintf(endpoint, "%s%s%s.xml?page=%d",
 743                                 session->hosturl, group_uri, session->group,
 744                                 session->page);
 745                         break;
 746                 case ACTION_FRIENDS:
 747                         sprintf(endpoint, "%s%s?page=%d", session->hosturl,
 748                                 friends_uri, session->page);
 749                         break;
 750                 case ACTION_RETWEET:
 751                         sprintf(endpoint, "%s%s%s.xml", session->hosturl,
 752                                 retweet_uri, session->retweet);
 753                         is_post = 1;
 754                         break;
 755                 default:
 756                         break;
 757                 }
 758
 759                 dbg("%s\n", endpoint);
 760                 if (!session->dry_run) {
 761                         if (is_post) {
 762                                 req_url = oauth_sign_url2(endpoint, &postarg, OA_HMAC,
 763                                                           NULL, session->consumer_key,
 764                                                           session->consumer_secret,
 765                                                           session->access_token_key,
 766                                                           session->access_token_secret);
 767                                 reply = oauth_http_post(req_url, postarg);
 768                         } else {
 769                                 req_url = oauth_sign_url2(endpoint, NULL, OA_HMAC, NULL,
 770                                                           session->consumer_key,
 771                                                           session->consumer_secret,
 772                                                           session->access_token_key,
 773                                                           session->access_token_secret);
 774                                 reply = oauth_http_get(req_url, postarg);
 775                         }
 776
 777                         dbg("%s\n", req_url);
 778                         dbg("%s\n", reply);
 779                         if (req_url)
 780                                 free(req_url);
 781                 }
 782
 783                 if (!reply) {
 784                         fprintf(stderr, "Error retrieving from URL (%s)\n", endpoint);
 785                         return -EIO;
 786                 }
 787
 788                 if ((session->action != ACTION_UPDATE) &&
 789                                 (session->action != ACTION_RETWEET))
 790                         parse_timeline(reply, session);
 791         }
 792         return 0;
 793 }
 794
 795 static void log_session(struct session *session, int retval)
 796 {
 797         FILE *log_file;
 798         char *filename;
 799
 800         /* Only log something if we have a log file set */
 801         if (!session->logfile)
 802                 return;
 803
 804         filename = alloca(strlen(session->homedir) +
 805                           strlen(session->logfile) + 3);
 806
 807         sprintf(filename, "%s/%s", session->homedir, session->logfile);
 808
 809         log_file = fopen(filename, "a+");
 810         if (log_file == NULL)
 811                 return;
 812
 813         switch (session->action) {
 814         case ACTION_UPDATE:
 815                 if (retval)
 816                         fprintf(log_file, "%s: host=%s tweet failed\n",
 817                                 session->time, session->hostname);
 818                 else
 819                         fprintf(log_file, "%s: host=%s tweet=%s\n",
 820                                 session->time, session->hostname,
 821                                 session->tweet);
 822                 break;
 823         case ACTION_FRIENDS:
 824                 fprintf(log_file, "%s: host=%s retrieving friends timeline\n",
 825                         session->time, session->hostname);
 826                 break;
 827         case ACTION_USER:
 828                 fprintf(log_file, "%s: host=%s retrieving %s's timeline\n",
 829                         session->time, session->hostname, session->user);
 830                 break;
 831         case ACTION_REPLIES:
 832                 fprintf(log_file, "%s: host=%s retrieving replies\n",
 833                         session->time, session->hostname);
 834                 break;
 835         case ACTION_PUBLIC:
 836                 fprintf(log_file, "%s: host=%s retrieving public timeline\n",
 837                         session->time, session->hostname);
 838                 break;
 839         case ACTION_GROUP:
 840                 fprintf(log_file, "%s: host=%s retrieving group timeline\n",
 841                         session->time, session->hostname);
 842                 break;
 843         default:
 844                 break;
 845         }
 846
 847         fclose(log_file);
 848 }
 849
 850 static char *get_string_from_stdin(void)
 851 {
 852         char *temp;
 853         char *string;
 854
 855         string = zalloc(1000);
 856         if (!string)
 857                 return NULL;
 858
 859         if (!fgets(string, 999, stdin)) {
 860                 free(string);
 861                 return NULL;
 862         }
 863         temp = strchr(string, '\n');
 864         if (temp)
 865                 *temp = '\0';
 866         return string;
 867 }
 868
 869 static void read_password(char *buf, size_t len, char *host)
 870 {
 871         char pwd[80];
 872         int retval;
 873         struct termios old;
 874         struct termios tp;
 875
 876         tcgetattr(0, &tp);
 877         old = tp;
 878
 879         tp.c_lflag &= (~ECHO);
 880         tcsetattr(0, TCSANOW, &tp);
 881
 882         fprintf(stdout, "Enter password for %s: ", host);
 883         fflush(stdout);
 884         tcflow(0, TCOOFF);
 885         retval = scanf("%79s", pwd);
 886         tcflow(0, TCOON);
 887         fprintf(stdout, "\n");
 888
 889         tcsetattr(0, TCSANOW, &old);
 890
 891         strncpy(buf, pwd, len);
 892         buf[len-1] = '\0';
 893 }
 894
 895 static int find_urls(const char *tweet, int **pranges)
 896 {
 897         /*
 898          * magic obtained from
 899          * http://www.geekpedia.com/KB65_How-to-validate-an-URL-using-RegEx-in-Csharp.html
 900          */
 901         static const char *re_magic =
 902                 "(([a-zA-Z][0-9a-zA-Z+\\-\\.]*:)/{1,3}"
 903                 "[0-9a-zA-Z;/~?:@&=+$\\.\\-_'()%]+)"
 904                 "(#[0-9a-zA-Z;/?:@&=+$\\.\\-_!~*'()%]+)?";
 905         pcre *re;
 906         const char *errptr;
 907         int erroffset;
 908         int ovector[10] = {0,};
 909         const size_t ovsize = sizeof(ovector)/sizeof(*ovector);
 910         int startoffset, tweetlen;
 911         int i, rc;
 912         int rbound = 10;
 913         int rcount = 0;
 914         int *ranges = malloc(sizeof(int) * rbound);
 915
 916         re = pcre_compile(re_magic,
 917                         PCRE_NO_AUTO_CAPTURE,
 918                         &errptr, &erroffset, NULL);
 919         if (!re) {
 920                 fprintf(stderr, "pcre_compile @%u: %s\n", erroffset, errptr);
 921                 exit(1);
 922         }
 923
 924         tweetlen = strlen(tweet);
 925         for (startoffset = 0; startoffset < tweetlen; ) {
 926
 927                 rc = pcre_exec(re, NULL, tweet, strlen(tweet), startoffset, 0,
 928                                 ovector, ovsize);
 929                 if (rc == PCRE_ERROR_NOMATCH)
 930                         break;
 931
 932                 if (rc < 0) {
 933                         fprintf(stderr, "pcre_exec @%u: %s\n",
 934                                 erroffset, errptr);
 935                         exit(1);
 936                 }
 937
 938                 for (i = 0; i < rc; i += 2) {
 939                         if ((rcount+2) == rbound) {
 940                                 rbound *= 2;
 941                                 ranges = realloc(ranges, sizeof(int) * rbound);
 942                         }
 943
 944                         ranges[rcount++] = ovector[i];
 945                         ranges[rcount++] = ovector[i+1];
 946                 }
 947
 948                 startoffset = ovector[1];
 949         }
 950
 951         pcre_free(re);
 952
 953         *pranges = ranges;
 954         return rcount;
 955 }
 956
 957 /**
 958  * bidirectional popen() call
 959  *
 960  * @param rwepipe - int array of size three
 961  * @param exe - program to run
 962  * @param argv - argument list
 963  * @return pid or -1 on error
 964  *
 965  * The caller passes in an array of three integers (rwepipe), on successful
 966  * execution it can then write to element 0 (stdin of exe), and read from
 967  * element 1 (stdout) and 2 (stderr).
 968  */
 969 static int popenRWE(int *rwepipe, const char *exe, const char *const argv[])
 970 {
 971         int in[2];
 972         int out[2];
 973         int err[2];
 974         int pid;
 975         int rc;
 976
 977         rc = pipe(in);
 978         if (rc < 0)
 979                 goto error_in;
 980
 981         rc = pipe(out);
 982         if (rc < 0)
 983                 goto error_out;
 984
 985         rc = pipe(err);
 986         if (rc < 0)
 987                 goto error_err;
 988
 989         pid = fork();
 990         if (pid > 0) {
 991                 /* parent */
 992                 close(in[0]);
 993                 close(out[1]);
 994                 close(err[1]);
 995                 rwepipe[0] = in[1];
 996                 rwepipe[1] = out[0];
 997                 rwepipe[2] = err[0];
 998                 return pid;
 999         } else if (pid == 0) {
1000                 /* child */
1001                 close(in[1]);
1002                 close(out[0]);
1003                 close(err[0]);
1004                 close(0);
1005                 rc = dup(in[0]);
1006                 close(1);
1007                 rc = dup(out[1]);
1008                 close(2);
1009                 rc = dup(err[1]);
1010
1011                 execvp(exe, (char **)argv);
1012                 exit(1);
1013         } else
1014                 goto error_fork;
1015
1016         return pid;
1017
1018 error_fork:
1019         close(err[0]);
1020         close(err[1]);
1021 error_err:
1022         close(out[0]);
1023         close(out[1]);
1024 error_out:
1025         close(in[0]);
1026         close(in[1]);
1027 error_in:
1028         return -1;
1029 }
1030
1031 static int pcloseRWE(int pid, int *rwepipe)
1032 {
1033         int rc, status;
1034         close(rwepipe[0]);
1035         close(rwepipe[1]);
1036         close(rwepipe[2]);
1037         rc = waitpid(pid, &status, 0);
1038         return status;
1039 }
1040
1041 static char *shrink_one_url(int *rwepipe, char *big)
1042 {
1043         int biglen = strlen(big);
1044         char *small;
1045         int smalllen;
1046         int rc;
1047
1048         rc = dprintf(rwepipe[0], "%s\n", big);
1049         if (rc < 0)
1050                 return big;
1051
1052         smalllen = biglen + 128;
1053         small = malloc(smalllen);
1054         if (!small)
1055                 return big;
1056
1057         rc = read(rwepipe[1], small, smalllen);
1058         if (rc < 0 || rc > biglen)
1059                 goto error_free_small;
1060
1061         if (strncmp(small, "http://", 7))
1062                 goto error_free_small;
1063
1064         smalllen = rc;
1065         while (smalllen && isspace(small[smalllen-1]))
1066                         small[--smalllen] = 0;
1067
1068         free(big);
1069         return small;
1070
1071 error_free_small:
1072         free(small);
1073         return big;
1074 }
1075
1076 static char *shrink_urls(char *text)
1077 {
1078         int *ranges;
1079         int rcount;
1080         int i;
1081         int inofs = 0;
1082         int outofs = 0;
1083         const char *const shrink_args[] = {
1084                 "bti-shrink-urls",
1085                 NULL
1086         };
1087         int shrink_pid;
1088         int shrink_pipe[3];
1089         int inlen = strlen(text);
1090
1091         dbg("before len=%u\n", inlen);
1092
1093         shrink_pid = popenRWE(shrink_pipe, shrink_args[0], shrink_args);
1094         if (shrink_pid < 0)
1095                 return text;
1096
1097         rcount = find_urls(text, &ranges);
1098         if (!rcount)
1099                 return text;
1100
1101         for (i = 0; i < rcount; i += 2) {
1102                 int url_start = ranges[i];
1103                 int url_end = ranges[i+1];
1104                 int long_url_len = url_end - url_start;
1105                 char *url = strndup(text + url_start, long_url_len);
1106                 int short_url_len;
1107                 int not_url_len = url_start - inofs;
1108
1109                 dbg("long  url[%u]: %s\n", long_url_len, url);
1110                 url = shrink_one_url(shrink_pipe, url);
1111                 short_url_len = url ? strlen(url) : 0;
1112                 dbg("short url[%u]: %s\n", short_url_len, url);
1113
1114                 if (!url || short_url_len >= long_url_len) {
1115                         /* The short url ended up being too long
1116                          * or unavailable */
1117                         if (inofs) {
1118                                 strncpy(text + outofs, text + inofs,
1119                                                 not_url_len + long_url_len);
1120                         }
1121                         inofs += not_url_len + long_url_len;
1122                         outofs += not_url_len + long_url_len;
1123
1124                 } else {
1125                         /* copy the unmodified block */
1126                         strncpy(text + outofs, text + inofs, not_url_len);
1127                         inofs += not_url_len;
1128                         outofs += not_url_len;
1129
1130                         /* copy the new url */
1131                         strncpy(text + outofs, url, short_url_len);
1132                         inofs += long_url_len;
1133                         outofs += short_url_len;
1134                 }
1135
1136                 free(url);
1137         }
1138
1139         /* copy the last block after the last match */
1140         if (inofs) {
1141                 int tail = inlen - inofs;
1142                 if (tail) {
1143                         strncpy(text + outofs, text + inofs, tail);
1144                         outofs += tail;
1145                 }
1146         }
1147
1148         free(ranges);
1149
1150         (void)pcloseRWE(shrink_pid, shrink_pipe);
1151
1152         text[outofs] = 0;
1153         dbg("after len=%u\n", outofs);
1154         return text;
1155 }
1156
1157 int main(int argc, char *argv[], char *envp[])
1158 {
1159         static const struct option options[] = {
1160                 { "debug", 0, NULL, 'd' },
1161                 { "verbose", 0, NULL, 'V' },
1162                 { "account", 1, NULL, 'a' },
1163                 { "password", 1, NULL, 'p' },
1164                 { "host", 1, NULL, 'H' },
1165                 { "proxy", 1, NULL, 'P' },
1166                 { "action", 1, NULL, 'A' },
1167                 { "user", 1, NULL, 'u' },
1168                 { "group", 1, NULL, 'G' },
1169                 { "logfile", 1, NULL, 'L' },
1170                 { "shrink-urls", 0, NULL, 's' },
1171                 { "help", 0, NULL, 'h' },
1172                 { "bash", 0, NULL, 'b' },
1173                 { "background", 0, NULL, 'B' },
1174                 { "dry-run", 0, NULL, 'n' },
1175                 { "page", 1, NULL, 'g' },
1176                 { "column", 1, NULL, 'o' },
1177                 { "version", 0, NULL, 'v' },
1178                 { "config", 1, NULL, 'c' },
1179                 { "replyto", 1, NULL, 'r' },
1180                 { "retweet", 1, NULL, 'w' },
1181                 { }
1182         };
1183         struct session *session;
1184         pid_t child;
1185         char *tweet;
1186         static char password[80];
1187         int retval = 0;
1188         int option;
1189         char *http_proxy;
1190         char *home;
1191         const char *config_file;
1192         time_t t;
1193         int page_nr;
1194
1195         debug = 0;
1196
1197         session = session_alloc();
1198         if (!session) {
1199                 fprintf(stderr, "no more memory...\n");
1200                 return -1;
1201         }
1202
1203         /* get the current time so that we can log it later */
1204         time(&t);
1205         session->time = strdup(ctime(&t));
1206         session->time[strlen(session->time)-1] = 0x00;
1207
1208         /*
1209          * Get the home directory so we can try to find a config file.
1210          * If we have no home dir set up, look in /etc/bti
1211          */
1212         home = getenv("HOME");
1213         if (home) {
1214                 /* We have a home dir, so this might be a user */
1215                 session->homedir = strdup(home);
1216                 config_file = config_user_default;
1217         } else {
1218                 session->homedir = strdup("");
1219                 config_file = config_default;
1220         }
1221
1222         /* set up a default config file location (traditionally ~/.bti) */
1223         session->configfile = zalloc(strlen(session->homedir) + strlen(config_file) + 7);
1224         sprintf(session->configfile, "%s/%s", session->homedir, config_file);
1225
1226         /* Set environment variables first, before reading command line options
1227          * or config file values. */
1228         http_proxy = getenv("http_proxy");
1229         if (http_proxy) {
1230                 if (session->proxy)
1231                         free(session->proxy);
1232                 session->proxy = strdup(http_proxy);
1233                 dbg("http_proxy = %s\n", session->proxy);
1234         }
1235
1236         bti_parse_configfile(session);
1237
1238         while (1) {
1239                 option = getopt_long_only(argc, argv,
1240                                           "dp:P:H:a:A:u:c:hg:o:G:sr:nVvw:",
1241                                           options, NULL);
1242                 if (option == -1)
1243                         break;
1244                 switch (option) {
1245                 case 'd':
1246                         debug = 1;
1247                         break;
1248                 case 'V':
1249                         session->verbose = 1;
1250                         break;
1251                 case 'a':
1252                         if (session->account)
1253                                 free(session->account);
1254                         session->account = strdup(optarg);
1255                         dbg("account = %s\n", session->account);
1256                         break;
1257                 case 'g':
1258                         page_nr = atoi(optarg);
1259                         dbg("page = %d\n", page_nr);
1260                         session->page = page_nr;
1261                         break;
1262                 case 'o':
1263                         session->column_output = atoi(optarg);
1264                         dbg("column_output = %d\n", session->column_output);
1265                         break;
1266                 case 'r':
1267                         session->replyto = strdup(optarg);
1268                         dbg("in_reply_to_status_id = %s\n", session->replyto);
1269                         break;
1270                 case 'w':
1271                         session->retweet = strdup(optarg);
1272                         dbg("Retweet ID = %s\n", session->retweet);
1273                         break;
1274                 case 'p':
1275                         if (session->password)
1276                                 free(session->password);
1277                         session->password = strdup(optarg);
1278                         dbg("password = %s\n", session->password);
1279                         break;
1280                 case 'P':
1281                         if (session->proxy)
1282                                 free(session->proxy);
1283                         session->proxy = strdup(optarg);
1284                         dbg("proxy = %s\n", session->proxy);
1285                         break;
1286                 case 'A':
1287                         if (strcasecmp(optarg, "update") == 0)
1288                                 session->action = ACTION_UPDATE;
1289                         else if (strcasecmp(optarg, "friends") == 0)
1290                                 session->action = ACTION_FRIENDS;
1291                         else if (strcasecmp(optarg, "user") == 0)
1292                                 session->action = ACTION_USER;
1293                         else if (strcasecmp(optarg, "replies") == 0)
1294                                 session->action = ACTION_REPLIES;
1295                         else if (strcasecmp(optarg, "public") == 0)
1296                                 session->action = ACTION_PUBLIC;
1297                         else if (strcasecmp(optarg, "group") == 0)
1298                                 session->action = ACTION_GROUP;
1299                         else if (strcasecmp(optarg, "retweet") == 0)
1300                                 session->action = ACTION_RETWEET;
1301                         else
1302                                 session->action = ACTION_UNKNOWN;
1303                         dbg("action = %d\n", session->action);
1304                         break;
1305                 case 'u':
1306                         if (session->user)
1307                                 free(session->user);
1308                         session->user = strdup(optarg);
1309                         dbg("user = %s\n", session->user);
1310                         break;
1311
1312                 case 'G':
1313                         if (session->group)
1314                                 free(session->group);
1315                         session->group = strdup(optarg);
1316                         dbg("group = %s\n", session->group);
1317                         break;
1318                 case 'L':
1319                         if (session->logfile)
1320                                 free(session->logfile);
1321                         session->logfile = strdup(optarg);
1322                         dbg("logfile = %s\n", session->logfile);
1323                         break;
1324                 case 's':
1325                         session->shrink_urls = 1;
1326                         break;
1327                 case 'H':
1328                         if (session->hosturl)
1329                                 free(session->hosturl);
1330                         if (session->hostname)
1331                                 free(session->hostname);
1332                         if (strcasecmp(optarg, "twitter") == 0) {
1333                                 session->host = HOST_TWITTER;
1334                                 session->hosturl = strdup(twitter_host);
1335                                 session->hostname = strdup(twitter_name);
1336                         } else if (strcasecmp(optarg, "identica") == 0) {
1337                                 session->host = HOST_IDENTICA;
1338                                 session->hosturl = strdup(identica_host);
1339                                 session->hostname = strdup(identica_name);
1340                         } else {
1341                                 session->host = HOST_CUSTOM;
1342                                 session->hosturl = strdup(optarg);
1343                                 session->hostname = strdup(optarg);
1344                         }
1345                         dbg("host = %d\n", session->host);
1346                         break;
1347                 case 'b':
1348                         session->bash = 1;
1349                         /* fall-through intended */
1350                 case 'B':
1351                         session->background = 1;
1352                         break;
1353                 case 'c':
1354                         if (session->configfile)
1355                                 free(session->configfile);
1356                         session->configfile = strdup(optarg);
1357                         dbg("configfile = %s\n", session->configfile);
1358
1359                         /*
1360                          * read the config file now.  Yes, this could override
1361                          * previously set options from the command line, but
1362                          * the user asked for it...
1363                          */
1364                         bti_parse_configfile(session);
1365                         break;
1366                 case 'h':
1367                         display_help();
1368                         goto exit;
1369                 case 'n':
1370                         session->dry_run = 1;
1371                         break;
1372                 case 'v':
1373                         display_version();
1374                         goto exit;
1375                 default:
1376                         display_help();
1377                         goto exit;
1378                 }
1379         }
1380
1381         session_readline_init(session);
1382         /*
1383          * Show the version to make it easier to determine what
1384          * is going on here
1385          */
1386         if (debug)
1387                 display_version();
1388
1389         if (session->host == HOST_TWITTER) {
1390                 if (!session->consumer_key || !session->consumer_secret) {
1391                         if (session->action == ACTION_USER ||
1392                                         session->action == ACTION_PUBLIC) {
1393                                 /*
1394                                  * Some actions may still work without
1395                                  * authentication
1396                                  */
1397                                 session->guest = 1;
1398                         } else {
1399                                 fprintf(stderr,
1400                                                 "Twitter no longer supports HTTP basic authentication.\n"
1401                                                 "Both consumer key, and consumer secret are required"
1402                                                 " for bti in order to behave as an OAuth consumer.\n");
1403                                 goto exit;
1404                         }
1405                 }
1406                 if (session->action == ACTION_GROUP) {
1407                         fprintf(stderr, "Groups only work in Identi.ca.\n");
1408                         goto exit;
1409                 }
1410         } else {
1411                 if (!session->consumer_key || !session->consumer_secret)
1412                         session->no_oauth = 1;
1413         }
1414
1415         if (session->no_oauth) {
1416                 if (!session->account) {
1417                         fprintf(stdout, "Enter account for %s: ",
1418                                 session->hostname);
1419                         session->account = session->readline(NULL);
1420                 }
1421                 if (!session->password) {
1422                         read_password(password, sizeof(password),
1423                                       session->hostname);
1424                         session->password = strdup(password);
1425                 }
1426         } else if (!session->guest) {
1427                 if (!session->access_token_key ||
1428                     !session->access_token_secret) {
1429                         request_access_token(session);
1430                         goto exit;
1431                 }
1432         }
1433
1434         if (session->action == ACTION_UNKNOWN) {
1435                 fprintf(stderr, "Unknown action, valid actions are:\n"
1436                         "'update', 'friends', 'public', 'replies', 'group' or 'user'.\n");
1437                 goto exit;
1438         }
1439
1440         if (session->action == ACTION_GROUP && !session->group) {
1441                 fprintf(stdout, "Enter group name: ");
1442                 session->group = session->readline(NULL);
1443         }
1444
1445         if (session->action == ACTION_RETWEET) {
1446                 if (!session->retweet) {
1447                         char *rtid;
1448
1449                         fprintf(stdout, "Status ID to retweet: ");
1450                         rtid = get_string_from_stdin();
1451                         session->retweet = zalloc(strlen(rtid) + 10);
1452                         sprintf(session->retweet, "%s", rtid);
1453                         free(rtid);
1454                 }
1455
1456                 if (!session->retweet || strlen(session->retweet) == 0) {
1457                         dbg("no retweet?\n");
1458                         return -1;
1459                 }
1460
1461                 dbg("retweet ID = %s\n", session->retweet);
1462         }
1463
1464         if (session->action == ACTION_UPDATE) {
1465                 if (session->background || !session->interactive)
1466                         tweet = get_string_from_stdin();
1467                 else
1468                         tweet = session->readline("tweet: ");
1469                 if (!tweet || strlen(tweet) == 0) {
1470                         dbg("no tweet?\n");
1471                         return -1;
1472                 }
1473
1474                 if (session->shrink_urls)
1475                         tweet = shrink_urls(tweet);
1476
1477                 session->tweet = zalloc(strlen(tweet) + 10);
1478                 if (session->bash)
1479                         sprintf(session->tweet, "%c %s",
1480                                 getuid() ? '$' : '#', tweet);
1481                 else
1482                         sprintf(session->tweet, "%s", tweet);
1483
1484                 free(tweet);
1485                 dbg("tweet = %s\n", session->tweet);
1486         }
1487
1488         if (session->page == 0)
1489                 session->page = 1;
1490         dbg("config file = %s\n", session->configfile);
1491         dbg("host = %d\n", session->host);
1492         dbg("action = %d\n", session->action);
1493
1494         /* fork ourself so that the main shell can get on
1495          * with it's life as we try to connect and handle everything
1496          */
1497         if (session->background) {
1498                 child = fork();
1499                 if (child) {
1500                         dbg("child is %d\n", child);
1501                         exit(0);
1502                 }
1503         }
1504
1505         retval = send_request(session);
1506         if (retval && !session->background)
1507                 fprintf(stderr, "operation failed\n");
1508
1509         log_session(session, retval);
1510 exit:
1511         session_readline_cleanup(session);
1512         session_free(session);
1513         return retval;;
1514 }