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