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