bti.c

   1 /*
   2  * Copyright (C) 2008 Greg Kroah-Hartman <greg@kroah.com>
   3  * Copyright (C) 2009 Bart Trojanowski <bart@jukie.net>
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License as published by the
   7  * Free Software Foundation version 2 of the License.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along
  15  * with this program; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  17  */
  18
  19 #define _GNU_SOURCE
  20
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23 #include <stddef.h>
  24 #include <string.h>
  25 #include <getopt.h>
  26 #include <errno.h>
  27 #include <ctype.h>
  28 #include <fcntl.h>
  29 #include <unistd.h>
  30 #include <time.h>
  31 #include <sys/stat.h>
  32 #include <sys/types.h>
  33 #include <sys/wait.h>
  34 #include <curl/curl.h>
  35 #include <readline/readline.h>
  36 #include <libxml/xmlmemory.h>
  37 #include <libxml/parser.h>
  38 #include <libxml/tree.h>
  39 #include <pcre.h>
  40
  41
  42 #define zalloc(size)    calloc(size, 1)
  43
  44 #define dbg(format, arg...)                                             \
  45         do {                                                            \
  46                 if (debug)                                              \
  47                         fprintf(stdout, "bti: %s: " format , __func__ , \
  48                                 ## arg);                                \
  49         } while (0)
  50
  51
  52 static int debug;
  53
  54 enum host {
  55         HOST_TWITTER  = 0,
  56         HOST_IDENTICA = 1,
  57         HOST_CUSTOM   = 2
  58 };
  59
  60 enum action {
  61         ACTION_UPDATE  = 0,
  62         ACTION_FRIENDS = 1,
  63         ACTION_USER    = 2,
  64         ACTION_REPLIES = 4,
  65         ACTION_PUBLIC  = 8,
  66         ACTION_UNKNOWN = 16
  67 };
  68
  69 struct session {
  70         char *password;
  71         char *account;
  72         char *tweet;
  73         char *proxy;
  74         char *time;
  75         char *homedir;
  76         char *logfile;
  77         char *user;
  78         char *hosturl;
  79         int bash;
  80         int shrink_urls;
  81         int dry_run;
  82         int page;
  83         enum host host;
  84         enum action action;
  85 };
  86
  87 struct bti_curl_buffer {
  88         char *data;
  89         enum action action;
  90         int length;
  91 };
  92
  93 static void display_help(void)
  94 {
  95         fprintf(stdout, "bti - send tweet to twitter or identi.ca\n");
  96         fprintf(stdout, "Version: " VERSION "\n");
  97         fprintf(stdout, "Usage:\n");
  98         fprintf(stdout, "  bti [options]\n");
  99         fprintf(stdout, "options are:\n");
 100         fprintf(stdout, "  --account accountname\n");
 101         fprintf(stdout, "  --password password\n");
 102         fprintf(stdout, "  --action action\n");
 103         fprintf(stdout, "    ('update', 'friends', 'public', 'replies' "
 104                 "or 'user')\n");
 105         fprintf(stdout, "  --user screenname\n");
 106         fprintf(stdout, "  --proxy PROXY:PORT\n");
 107         fprintf(stdout, "  --host HOST\n");
 108         fprintf(stdout, "  --logfile logfile\n");
 109         fprintf(stdout, "  --shrink-urls\n");
 110         fprintf(stdout, "  --page PAGENUMBER\n");
 111         fprintf(stdout, "  --bash\n");
 112         fprintf(stdout, "  --debug\n");
 113         fprintf(stdout, "  --dry-run\n");
 114         fprintf(stdout, "  --version\n");
 115         fprintf(stdout, "  --help\n");
 116 }
 117
 118 static void display_version(void)
 119 {
 120         fprintf(stdout, "bti - version %s\n", VERSION);
 121 }
 122
 123 static struct session *session_alloc(void)
 124 {
 125         struct session *session;
 126
 127         session = zalloc(sizeof(*session));
 128         if (!session)
 129                 return NULL;
 130         return session;
 131 }
 132
 133 static void session_free(struct session *session)
 134 {
 135         if (!session)
 136                 return;
 137         free(session->password);
 138         free(session->account);
 139         free(session->tweet);
 140         free(session->proxy);
 141         free(session->time);
 142         free(session->homedir);
 143         free(session->user);
 144         free(session->hosturl);
 145         free(session);
 146 }
 147
 148 static struct bti_curl_buffer *bti_curl_buffer_alloc(enum action action)
 149 {
 150         struct bti_curl_buffer *buffer;
 151
 152         buffer = zalloc(sizeof(*buffer));
 153         if (!buffer)
 154                 return NULL;
 155
 156         /* start out with a data buffer of 1 byte to
 157          * make the buffer fill logic simpler */
 158         buffer->data = zalloc(1);
 159         if (!buffer->data) {
 160                 free(buffer);
 161                 return NULL;
 162         }
 163         buffer->length = 0;
 164         buffer->action = action;
 165         return buffer;
 166 }
 167
 168 static void bti_curl_buffer_free(struct bti_curl_buffer *buffer)
 169 {
 170         if (!buffer)
 171                 return;
 172         free(buffer->data);
 173         free(buffer);
 174 }
 175
 176 static const char *twitter_host  = "http://twitter.com/statuses";
 177 static const char *identica_host = "https://identi.ca/api/statuses";
 178
 179 static const char *user_uri    = "/user_timeline/";
 180 static const char *update_uri  = "/update.xml";
 181 static const char *public_uri  = "/public_timeline.xml";
 182 static const char *friends_uri = "/friends_timeline.xml";
 183 static const char *replies_uri = "/replies.xml";
 184
 185 static CURL *curl_init(void)
 186 {
 187         CURL *curl;
 188
 189         curl = curl_easy_init();
 190         if (!curl) {
 191                 fprintf(stderr, "Can not init CURL!\n");
 192                 return NULL;
 193         }
 194         /* some ssl sanity checks on the connection we are making */
 195         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0);
 196         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0);
 197         return curl;
 198 }
 199
 200 static void parse_statuses(xmlDocPtr doc, xmlNodePtr current)
 201 {
 202         xmlChar *text = NULL;
 203         xmlChar *user = NULL;
 204         xmlChar *created = NULL;
 205         xmlNodePtr userinfo;
 206
 207         current = current->xmlChildrenNode;
 208         while (current != NULL) {
 209                 if (current->type == XML_ELEMENT_NODE) {
 210                         if (!xmlStrcmp(current->name, (const xmlChar *)"created_at"))
 211                                 created = xmlNodeListGetString(doc, current->xmlChildrenNode, 1);
 212                         if (!xmlStrcmp(current->name, (const xmlChar *)"text"))
 213                                 text = xmlNodeListGetString(doc, current->xmlChildrenNode, 1);
 214                         if (!xmlStrcmp(current->name, (const xmlChar *)"user")) {
 215                                 userinfo = current->xmlChildrenNode;
 216                                 while (userinfo != NULL) {
 217                                         if ((!xmlStrcmp(userinfo->name, (const xmlChar *)"screen_name"))) {
 218                                                 if (user)
 219                                                         xmlFree(user);
 220                                                 user = xmlNodeListGetString(doc, userinfo->xmlChildrenNode, 1);
 221                                         }
 222                                         userinfo = userinfo->next;
 223                                 }
 224                         }
 225
 226                         if (user && text && created) {
 227                                 printf("[%s] (%.16s) %s\n",
 228                                         user, created, text);
 229                                 xmlFree(user);
 230                                 xmlFree(text);
 231                                 xmlFree(created);
 232                                 user = NULL;
 233                                 text = NULL;
 234                                 created = NULL;
 235                         }
 236                 }
 237                 current = current->next;
 238         }
 239
 240         return;
 241 }
 242
 243 static void parse_timeline(char *document)
 244 {
 245         xmlDocPtr doc;
 246         xmlNodePtr current;
 247
 248         doc = xmlReadMemory(document, strlen(document), "timeline.xml",
 249                             NULL, XML_PARSE_NOERROR);
 250         if (doc == NULL)
 251                 return;
 252
 253         current = xmlDocGetRootElement(doc);
 254         if (current == NULL) {
 255                 fprintf(stderr, "empty document\n");
 256                 xmlFreeDoc(doc);
 257                 return;
 258         }
 259
 260         if (xmlStrcmp(current->name, (const xmlChar *) "statuses")) {
 261                 fprintf(stderr, "unexpected document type\n");
 262                 xmlFreeDoc(doc);
 263                 return;
 264         }
 265
 266         current = current->xmlChildrenNode;
 267         while (current != NULL) {
 268                 if ((!xmlStrcmp(current->name, (const xmlChar *)"status")))
 269                         parse_statuses(doc, current);
 270                 current = current->next;
 271         }
 272         xmlFreeDoc(doc);
 273
 274         return;
 275 }
 276
 277 static size_t curl_callback(void *buffer, size_t size, size_t nmemb,
 278                             void *userp)
 279 {
 280         struct bti_curl_buffer *curl_buf = userp;
 281         size_t buffer_size = size * nmemb;
 282         char *temp;
 283
 284         if ((!buffer) || (!buffer_size) || (!curl_buf))
 285                 return -EINVAL;
 286
 287         /* add to the data we already have */
 288         temp = zalloc(curl_buf->length + buffer_size + 1);
 289         if (!temp)
 290                 return -ENOMEM;
 291
 292         memcpy(temp, curl_buf->data, curl_buf->length);
 293         free(curl_buf->data);
 294         curl_buf->data = temp;
 295         memcpy(&curl_buf->data[curl_buf->length], (char *)buffer, buffer_size);
 296         curl_buf->length += buffer_size;
 297         if (curl_buf->action)
 298                 parse_timeline(curl_buf->data);
 299
 300         dbg("%s\n", curl_buf->data);
 301
 302         return buffer_size;
 303 }
 304
 305 static int send_request(struct session *session)
 306 {
 307         char endpoint[100];
 308         char user_password[500];
 309         char data[500];
 310         struct bti_curl_buffer *curl_buf;
 311         CURL *curl = NULL;
 312         CURLcode res;
 313         struct curl_httppost *formpost = NULL;
 314         struct curl_httppost *lastptr = NULL;
 315         struct curl_slist *slist = NULL;
 316
 317         if (!session)
 318                 return -EINVAL;
 319
 320         curl_buf = bti_curl_buffer_alloc(session->action);
 321         if (!curl_buf)
 322                 return -ENOMEM;
 323
 324         curl = curl_init();
 325         if (!curl)
 326                 return -EINVAL;
 327
 328         switch (session->action) {
 329         case ACTION_UPDATE:
 330                 snprintf(user_password, sizeof(user_password), "%s:%s",
 331                          session->account, session->password);
 332                 snprintf(data, sizeof(data), "status=\"%s\"", session->tweet);
 333                 curl_formadd(&formpost, &lastptr,
 334                              CURLFORM_COPYNAME, "status",
 335                              CURLFORM_COPYCONTENTS, session->tweet,
 336                              CURLFORM_END);
 337
 338                 curl_formadd(&formpost, &lastptr,
 339                              CURLFORM_COPYNAME, "source",
 340                              CURLFORM_COPYCONTENTS, "bti",
 341                              CURLFORM_END);
 342
 343                 curl_easy_setopt(curl, CURLOPT_HTTPPOST, formpost);
 344                 slist = curl_slist_append(slist, "Expect:");
 345                 curl_easy_setopt(curl, CURLOPT_HTTPHEADER, slist);
 346
 347                 sprintf(endpoint, "%s%s", session->hosturl, update_uri);
 348                 curl_easy_setopt(curl, CURLOPT_URL, endpoint);
 349                 curl_easy_setopt(curl, CURLOPT_USERPWD, user_password);
 350
 351                 break;
 352         case ACTION_FRIENDS:
 353                 snprintf(user_password, sizeof(user_password), "%s:%s",
 354                          session->account, session->password);
 355                 sprintf(endpoint, "%s%s?page=%d", session->hosturl,
 356                         friends_uri, session->page);
 357                 curl_easy_setopt(curl, CURLOPT_URL, endpoint);
 358                 curl_easy_setopt(curl, CURLOPT_USERPWD, user_password);
 359
 360                 break;
 361         case ACTION_USER:
 362                 sprintf(endpoint, "%s%s%s.xml?page=%d", session->hosturl, user_uri,
 363                                 session->user, session->page);
 364                 curl_easy_setopt(curl, CURLOPT_URL, endpoint);
 365
 366                 break;
 367         case ACTION_REPLIES:
 368                 snprintf(user_password, sizeof(user_password), "%s:%s",
 369                          session->account, session->password);
 370                 sprintf(endpoint, "%s%s?page=%d", session->hosturl, replies_uri, session->page);
 371                 curl_easy_setopt(curl, CURLOPT_URL, endpoint);
 372                 curl_easy_setopt(curl, CURLOPT_USERPWD, user_password);
 373
 374                 break;
 375         case ACTION_PUBLIC:
 376                 sprintf(endpoint, "%s%s?page=%d", session->hosturl, public_uri, session->page);
 377                 curl_easy_setopt(curl, CURLOPT_URL, endpoint);
 378
 379                 break;
 380         default:
 381                 break;
 382         }
 383
 384         if (session->proxy)
 385                 curl_easy_setopt(curl, CURLOPT_PROXY, session->proxy);
 386
 387         if (debug)
 388                 curl_easy_setopt(curl, CURLOPT_VERBOSE, 1);
 389
 390         dbg("user_password = %s\n", user_password);
 391         dbg("data = %s\n", data);
 392         dbg("proxy = %s\n", session->proxy);
 393
 394         curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, curl_callback);
 395         curl_easy_setopt(curl, CURLOPT_WRITEDATA, curl_buf);
 396         if (!session->dry_run) {
 397                 res = curl_easy_perform(curl);
 398                 if (res && !session->bash) {
 399                         fprintf(stderr, "error(%d) trying to perform "
 400                                 "operation\n", res);
 401                         return -EINVAL;
 402                 }
 403         }
 404
 405         curl_easy_cleanup(curl);
 406         if (session->action == ACTION_UPDATE)
 407                 curl_formfree(formpost);
 408         bti_curl_buffer_free(curl_buf);
 409         return 0;
 410 }
 411
 412 static void parse_configfile(struct session *session)
 413 {
 414         FILE *config_file;
 415         char *line = NULL;
 416         size_t len = 0;
 417         char *account = NULL;
 418         char *password = NULL;
 419         char *host = NULL;
 420         char *proxy = NULL;
 421         char *logfile = NULL;
 422         char *action = NULL;
 423         char *user = NULL;
 424         char *file;
 425         int shrink_urls = 0;
 426
 427         /* config file is ~/.bti  */
 428         file = alloca(strlen(session->homedir) + 7);
 429
 430         sprintf(file, "%s/.bti", session->homedir);
 431
 432         config_file = fopen(file, "r");
 433
 434         /* No error if file does not exist or is unreadable.  */
 435         if (config_file == NULL)
 436                 return;
 437
 438         do {
 439                 ssize_t n = getline(&line, &len, config_file);
 440                 if (n < 0)
 441                         break;
 442                 if (line[n - 1] == '\n')
 443                         line[n - 1] = '\0';
 444                 /* Parse file.  Format is the usual value pairs:
 445                    account=name
 446                    passwort=value
 447                    # is a comment character
 448                 */
 449                 *strchrnul(line, '#') = '\0';
 450                 char *c = line;
 451                 while (isspace(*c))
 452                         c++;
 453                 /* Ignore blank lines.  */
 454                 if (c[0] == '\0')
 455                         continue;
 456
 457                 if (!strncasecmp(c, "account", 7) && (c[7] == '=')) {
 458                         c += 8;
 459                         if (c[0] != '\0')
 460                                 account = strdup(c);
 461                 } else if (!strncasecmp(c, "password", 8) &&
 462                            (c[8] == '=')) {
 463                         c += 9;
 464                         if (c[0] != '\0')
 465                                 password = strdup(c);
 466                 } else if (!strncasecmp(c, "host", 4) &&
 467                            (c[4] == '=')) {
 468                         c += 5;
 469                         if (c[0] != '\0')
 470                                 host = strdup(c);
 471                 } else if (!strncasecmp(c, "proxy", 5) &&
 472                            (c[5] == '=')) {
 473                         c += 6;
 474                         if (c[0] != '\0')
 475                                 proxy = strdup(c);
 476                 } else if (!strncasecmp(c, "logfile", 7) &&
 477                            (c[7] == '=')) {
 478                         c += 8;
 479                         if (c[0] != '\0')
 480                                 logfile = strdup(c);
 481                 } else if (!strncasecmp(c, "action", 6) &&
 482                            (c[6] == '=')) {
 483                         c += 7;
 484                         if (c[0] != '\0')
 485                                 action = strdup(c);
 486                 } else if (!strncasecmp(c, "user", 4) &&
 487                                 (c[4] == '=')) {
 488                         c += 5;
 489                         if (c[0] != '\0')
 490                                 user = strdup(c);
 491                 } else if (!strncasecmp(c, "shrink-urls", 11) &&
 492                                 (c[11] == '=')) {
 493                         c += 12;
 494                         if (!strncasecmp(c, "true", 4) ||
 495                                         !strncasecmp(c, "yes", 3))
 496                                 shrink_urls = 1;
 497                 }
 498         } while (!feof(config_file));
 499
 500         if (password)
 501                 session->password = password;
 502         if (account)
 503                 session->account = account;
 504         if (host) {
 505                 if (strcasecmp(host, "twitter") == 0) {
 506                         session->host = HOST_TWITTER;
 507                         session->hosturl = strdup(twitter_host);
 508                 } else if (strcasecmp(host, "identica") == 0) {
 509                         session->host = HOST_IDENTICA;
 510                         session->hosturl = strdup(identica_host);
 511                 } else {
 512                         session->host = HOST_CUSTOM;
 513                         session->hosturl = strdup(host);
 514                 }
 515                 free(host);
 516         }
 517         if (proxy) {
 518                 if (session->proxy)
 519                         free(session->proxy);
 520                 session->proxy = proxy;
 521         }
 522         if (logfile)
 523                 session->logfile = logfile;
 524         if (action) {
 525                 if (strcasecmp(action, "update") == 0)
 526                         session->action = ACTION_UPDATE;
 527                 else if (strcasecmp(action, "friends") == 0)
 528                         session->action = ACTION_FRIENDS;
 529                 else if (strcasecmp(action, "user") == 0)
 530                         session->action = ACTION_USER;
 531                 else if (strcasecmp(action, "replies") == 0)
 532                         session->action = ACTION_REPLIES;
 533                 else if (strcasecmp(action, "public") == 0)
 534                         session->action = ACTION_PUBLIC;
 535                 else
 536                         session->action = ACTION_UNKNOWN;
 537                 free(action);
 538         }
 539         if (user)
 540                 session->user = user;
 541         session->shrink_urls = shrink_urls;
 542
 543         /* Free buffer and close file.  */
 544         free(line);
 545         fclose(config_file);
 546 }
 547
 548 static void log_session(struct session *session, int retval)
 549 {
 550         FILE *log_file;
 551         char *filename;
 552         char *host;
 553
 554         /* Only log something if we have a log file set */
 555         if (!session->logfile)
 556                 return;
 557
 558         filename = alloca(strlen(session->homedir) +
 559                           strlen(session->logfile) + 3);
 560
 561         sprintf(filename, "%s/%s", session->homedir, session->logfile);
 562
 563         log_file = fopen(filename, "a+");
 564         if (log_file == NULL)
 565                 return;
 566         switch (session->host) {
 567         case HOST_TWITTER:
 568                 host = "twitter";
 569                 break;
 570         case HOST_IDENTICA:
 571                 host = "identi.ca";
 572                 break;
 573         default:
 574                 host = session->hosturl;
 575                 break;
 576         }
 577
 578         switch (session->action) {
 579         case ACTION_UPDATE:
 580                 if (retval)
 581                         fprintf(log_file, "%s: host=%s tweet failed\n",
 582                                 session->time, host);
 583                 else
 584                         fprintf(log_file, "%s: host=%s tweet=%s\n",
 585                                 session->time, host, session->tweet);
 586                 break;
 587         case ACTION_FRIENDS:
 588                 fprintf(log_file, "%s: host=%s retrieving friends timeline\n",
 589                         session->time, host);
 590                 break;
 591         case ACTION_USER:
 592                 fprintf(log_file, "%s: host=%s retrieving %s's timeline\n",
 593                         session->time, host, session->user);
 594                 break;
 595         case ACTION_REPLIES:
 596                 fprintf(log_file, "%s: host=%s retrieving replies\n",
 597                         session->time, host);
 598                 break;
 599         case ACTION_PUBLIC:
 600                 fprintf(log_file, "%s: host=%s retrieving public timeline\n",
 601                         session->time, host);
 602                 break;
 603         default:
 604                 break;
 605         }
 606
 607         fclose(log_file);
 608 }
 609
 610 static char *get_string_from_stdin(void)
 611 {
 612         char *temp;
 613         char *string;
 614
 615         string = zalloc(1000);
 616         if (!string)
 617                 return NULL;
 618
 619         if (!fgets(string, 999, stdin))
 620                 return NULL;
 621         temp = strchr(string, '\n');
 622         *temp = '\0';
 623         return string;
 624 }
 625
 626 static int find_urls(const char *tweet, int **pranges)
 627 {
 628         /*
 629          * magic obtained from
 630          * http://www.geekpedia.com/KB65_How-to-validate-an-URL-using-RegEx-in-Csharp.html
 631          */
 632         static const char *re_magic =
 633                 "(([a-zA-Z][0-9a-zA-Z+\\-\\.]*:)/{1,3}"
 634                 "[0-9a-zA-Z;/~?:@&=+$\\.\\-_'()%]+)"
 635                 "(#[0-9a-zA-Z;/?:@&=+$\\.\\-_!~*'()%]+)?";
 636         pcre *re;
 637         const char *errptr;
 638         int erroffset;
 639         int ovector[10] = {0,};
 640         const size_t ovsize = sizeof(ovector)/sizeof(*ovector);
 641         int startoffset, tweetlen;
 642         int i, rc;
 643         int rbound = 10;
 644         int rcount = 0;
 645         int *ranges = malloc(sizeof(int) * rbound);
 646
 647         re = pcre_compile(re_magic,
 648                         PCRE_NO_AUTO_CAPTURE,
 649                         &errptr, &erroffset, NULL);
 650         if (!re) {
 651                 fprintf(stderr, "pcre_compile @%u: %s\n", erroffset, errptr);
 652                 exit(1);
 653         }
 654
 655         tweetlen = strlen(tweet);
 656         for (startoffset = 0; startoffset < tweetlen; ) {
 657
 658                 rc = pcre_exec(re, NULL, tweet, strlen(tweet), startoffset, 0,
 659                                 ovector, ovsize);
 660                 if (rc == PCRE_ERROR_NOMATCH)
 661                         break;
 662
 663                 if (rc < 0) {
 664                         fprintf(stderr, "pcre_exec @%u: %s\n",
 665                                 erroffset, errptr);
 666                         exit(1);
 667                 }
 668
 669                 for (i = 0; i < rc; i += 2) {
 670                         if ((rcount+2) == rbound) {
 671                                 rbound *= 2;
 672                                 ranges = realloc(ranges, sizeof(int) * rbound);
 673                         }
 674
 675                         ranges[rcount++] = ovector[i];
 676                         ranges[rcount++] = ovector[i+1];
 677                 }
 678
 679                 startoffset = ovector[1];
 680         }
 681
 682         pcre_free(re);
 683
 684         *pranges = ranges;
 685         return rcount;
 686 }
 687
 688 /**
 689  * bidirectional popen() call
 690  *
 691  * @param rwepipe - int array of size three
 692  * @param exe - program to run
 693  * @param argv - argument list
 694  * @return pid or -1 on error
 695  *
 696  * The caller passes in an array of three integers (rwepipe), on successful
 697  * execution it can then write to element 0 (stdin of exe), and read from
 698  * element 1 (stdout) and 2 (stderr).
 699  */
 700 static int popenRWE(int *rwepipe, const char *exe, const char *const argv[])
 701 {
 702         int in[2];
 703         int out[2];
 704         int err[2];
 705         int pid;
 706         int rc;
 707
 708         rc = pipe(in);
 709         if (rc < 0)
 710                 goto error_in;
 711
 712         rc = pipe(out);
 713         if (rc < 0)
 714                 goto error_out;
 715
 716         rc = pipe(err);
 717         if (rc < 0)
 718                 goto error_err;
 719
 720         pid = fork();
 721         if (pid > 0) {
 722                 /* parent */
 723                 close(in[0]);
 724                 close(out[1]);
 725                 close(err[1]);
 726                 rwepipe[0] = in[1];
 727                 rwepipe[1] = out[0];
 728                 rwepipe[2] = err[0];
 729                 return pid;
 730         } else if (pid == 0) {
 731                 /* child */
 732                 close(in[1]);
 733                 close(out[0]);
 734                 close(err[0]);
 735                 close(0);
 736                 rc = dup(in[0]);
 737                 close(1);
 738                 rc = dup(out[1]);
 739                 close(2);
 740                 rc = dup(err[1]);
 741
 742                 execvp(exe, (char **)argv);
 743                 exit(1);
 744         } else
 745                 goto error_fork;
 746
 747         return pid;
 748
 749 error_fork:
 750         close(err[0]);
 751         close(err[1]);
 752 error_err:
 753         close(out[0]);
 754         close(out[1]);
 755 error_out:
 756         close(in[0]);
 757         close(in[1]);
 758 error_in:
 759         return -1;
 760 }
 761
 762 static int pcloseRWE(int pid, int *rwepipe)
 763 {
 764         int rc, status;
 765         close(rwepipe[0]);
 766         close(rwepipe[1]);
 767         close(rwepipe[2]);
 768         rc = waitpid(pid, &status, 0);
 769         return status;
 770 }
 771
 772 static char *shrink_one_url(int *rwepipe, char *big)
 773 {
 774         int biglen = strlen(big);
 775         char *small;
 776         int smalllen;
 777         int rc;
 778
 779         rc = dprintf(rwepipe[0], "%s\n", big);
 780         if (rc < 0)
 781                 return big;
 782
 783         smalllen = biglen + 128;
 784         small = malloc(smalllen);
 785         if (!small)
 786                 return big;
 787
 788         rc = read(rwepipe[1], small, smalllen);
 789         if (rc < 0 || rc > biglen)
 790                 goto error_free_small;
 791
 792         if (strncmp(small, "http://", 7))
 793                 goto error_free_small;
 794
 795         smalllen = rc;
 796         while (smalllen && isspace(small[smalllen-1]))
 797                         small[--smalllen] = 0;
 798
 799         free(big);
 800         return small;
 801
 802 error_free_small:
 803         free(small);
 804         return big;
 805 }
 806
 807 static char *shrink_urls(char *text)
 808 {
 809         int *ranges;
 810         int rcount;
 811         int i;
 812         int inofs = 0;
 813         int outofs = 0;
 814         const char *const shrink_args[] = {
 815                 "bti-shrink-urls",
 816                 NULL
 817         };
 818         int shrink_pid;
 819         int shrink_pipe[3];
 820         int inlen = strlen(text);
 821
 822         dbg("before len=%u\n", inlen);
 823
 824         shrink_pid = popenRWE(shrink_pipe, shrink_args[0], shrink_args);
 825         if (shrink_pid < 0)
 826                 return text;
 827
 828         rcount = find_urls(text, &ranges);
 829         if (!rcount)
 830                 return text;
 831
 832         for (i = 0; i < rcount; i += 2) {
 833                 int url_start = ranges[i];
 834                 int url_end = ranges[i+1];
 835                 int long_url_len = url_end - url_start;
 836                 char *url = strndup(text + url_start, long_url_len);
 837                 int short_url_len;
 838                 int not_url_len = url_start - inofs;
 839
 840                 dbg("long  url[%u]: %s\n", long_url_len, url);
 841                 url = shrink_one_url(shrink_pipe, url);
 842                 short_url_len = url ? strlen(url) : 0;
 843                 dbg("short url[%u]: %s\n", short_url_len, url);
 844
 845                 if (!url || short_url_len >= long_url_len) {
 846                         /* The short url ended up being too long
 847                          * or unavailable */
 848                         if (inofs) {
 849                                 strncpy(text + outofs, text + inofs,
 850                                                 not_url_len + long_url_len);
 851                         }
 852                         inofs += not_url_len + long_url_len;
 853                         outofs += not_url_len + long_url_len;
 854
 855                 } else {
 856                         /* copy the unmodified block */
 857                         strncpy(text + outofs, text + inofs, not_url_len);
 858                         inofs += not_url_len;
 859                         outofs += not_url_len;
 860
 861                         /* copy the new url */
 862                         strncpy(text + outofs, url, short_url_len);
 863                         inofs += long_url_len;
 864                         outofs += short_url_len;
 865                 }
 866
 867                 free(url);
 868         }
 869
 870         /* copy the last block after the last match */
 871         if (inofs) {
 872                 int tail = inlen - inofs;
 873                 if (tail) {
 874                         strncpy(text + outofs, text + inofs, tail);
 875                         outofs += tail;
 876                 }
 877         }
 878
 879         free(ranges);
 880
 881         (void)pcloseRWE(shrink_pid, shrink_pipe);
 882
 883         text[outofs] = 0;
 884         dbg("after len=%u\n", outofs);
 885         return text;
 886 }
 887
 888 int main(int argc, char *argv[], char *envp[])
 889 {
 890         static const struct option options[] = {
 891                 { "debug", 0, NULL, 'd' },
 892                 { "account", 1, NULL, 'a' },
 893                 { "password", 1, NULL, 'p' },
 894                 { "host", 1, NULL, 'H' },
 895                 { "proxy", 1, NULL, 'P' },
 896                 { "action", 1, NULL, 'A' },
 897                 { "user", 1, NULL, 'u' },
 898                 { "logfile", 1, NULL, 'L' },
 899                 { "shrink-urls", 0, NULL, 's' },
 900                 { "help", 0, NULL, 'h' },
 901                 { "bash", 0, NULL, 'b' },
 902                 { "dry-run", 0, NULL, 'n' },
 903                 { "page", 1, NULL, 'g' },
 904                 { "version", 0, NULL, 'v' },
 905                 { }
 906         };
 907         struct session *session;
 908         pid_t child;
 909         char *tweet;
 910         int retval = 0;
 911         int option;
 912         char *http_proxy;
 913         time_t t;
 914         int page_nr;
 915
 916         debug = 0;
 917         rl_bind_key('\t', rl_insert);
 918
 919         session = session_alloc();
 920         if (!session) {
 921                 fprintf(stderr, "no more memory...\n");
 922                 return -1;
 923         }
 924
 925         /* get the current time so that we can log it later */
 926         time(&t);
 927         session->time = strdup(ctime(&t));
 928         session->time[strlen(session->time)-1] = 0x00;
 929
 930         session->homedir = strdup(getenv("HOME"));
 931
 932         curl_global_init(CURL_GLOBAL_ALL);
 933
 934         /* Set environment variables first, before reading command line options
 935          * or config file values. */
 936         http_proxy = getenv("http_proxy");
 937         if (http_proxy) {
 938                 if (session->proxy)
 939                         free(session->proxy);
 940                 session->proxy = strdup(http_proxy);
 941                 dbg("http_proxy = %s\n", session->proxy);
 942         }
 943
 944         parse_configfile(session);
 945
 946         while (1) {
 947                 option = getopt_long_only(argc, argv, "dqe:p:P:H:a:A:u:hg:sn",
 948                                           options, NULL);
 949                 if (option == -1)
 950                         break;
 951                 switch (option) {
 952                 case 'd':
 953                         debug = 1;
 954                         break;
 955                 case 'a':
 956                         if (session->account)
 957                                 free(session->account);
 958                         session->account = strdup(optarg);
 959                         dbg("account = %s\n", session->account);
 960                         break;
 961                 case 'g':
 962                         page_nr = atoi(optarg);
 963                         dbg("page = %d\n", page_nr);
 964                         session->page = page_nr;
 965                         break;
 966                 case 'p':
 967                         if (session->password)
 968                                 free(session->password);
 969                         session->password = strdup(optarg);
 970                         dbg("password = %s\n", session->password);
 971                         break;
 972                 case 'P':
 973                         if (session->proxy)
 974                                 free(session->proxy);
 975                         session->proxy = strdup(optarg);
 976                         dbg("proxy = %s\n", session->proxy);
 977                         break;
 978                 case 'A':
 979                         if (strcasecmp(optarg, "update") == 0)
 980                                 session->action = ACTION_UPDATE;
 981                         else if (strcasecmp(optarg, "friends") == 0)
 982                                 session->action = ACTION_FRIENDS;
 983                         else if (strcasecmp(optarg, "user") == 0)
 984                                 session->action = ACTION_USER;
 985                         else if (strcasecmp(optarg, "replies") == 0)
 986                                 session->action = ACTION_REPLIES;
 987                         else if (strcasecmp(optarg, "public") == 0)
 988                                 session->action = ACTION_PUBLIC;
 989                         else
 990                                 session->action = ACTION_UNKNOWN;
 991                         dbg("action = %d\n", session->action);
 992                         break;
 993                 case 'u':
 994                         if (session->user)
 995                                 free(session->user);
 996                         session->user = strdup(optarg);
 997                         dbg("user = %s\n", session->user);
 998                         break;
 999                 case 'L':
1000                         if (session->logfile)
1001                                 free(session->logfile);
1002                         session->logfile = strdup(optarg);
1003                         dbg("logfile = %s\n", session->logfile);
1004                         break;
1005                 case 's':
1006                         session->shrink_urls = 1;
1007                         break;
1008                 case 'H':
1009                         if (session->hosturl)
1010                                 free(session->hosturl);
1011                         if (strcasecmp(optarg, "twitter") == 0) {
1012                                 session->host = HOST_TWITTER;
1013                                 session->hosturl = strdup(twitter_host);
1014                         } else if (strcasecmp(optarg, "identica") == 0) {
1015                                 session->host = HOST_IDENTICA;
1016                                 session->hosturl = strdup(identica_host);
1017                         } else {
1018                                 session->host = HOST_CUSTOM;
1019                                 session->hosturl = strdup(optarg);
1020                         }
1021                         dbg("host = %d\n", session->host);
1022                         break;
1023                 case 'b':
1024                         session->bash = 1;
1025                         break;
1026                 case 'h':
1027                         display_help();
1028                         goto exit;
1029                 case 'n':
1030                         session->dry_run = 1;
1031                         break;
1032                 case 'v':
1033                         display_version();
1034                         goto exit;
1035                 default:
1036                         display_help();
1037                         goto exit;
1038                 }
1039         }
1040
1041         /*
1042          * Show the version to make it easier to determine what
1043          * is going on here
1044          */
1045         if (debug)
1046                 display_version();
1047
1048         if (session->action == ACTION_UNKNOWN) {
1049                 fprintf(stderr, "Unknown action, valid actions are:\n");
1050                 fprintf(stderr, "'update', 'friends', 'public', "
1051                         "'replies' or 'user'.\n");
1052                 goto exit;
1053         }
1054
1055         if (!session->account) {
1056                 fprintf(stdout, "Enter twitter account: ");
1057                 session->account = readline(NULL);
1058         }
1059
1060         if (!session->password) {
1061                 fprintf(stdout, "Enter twitter password: ");
1062                 session->password = readline(NULL);
1063         }
1064
1065         if (session->action == ACTION_UPDATE) {
1066                 if (session->bash)
1067                         tweet = get_string_from_stdin();
1068                 else
1069                         tweet = readline("tweet: ");
1070                 if (!tweet || strlen(tweet) == 0) {
1071                         dbg("no tweet?\n");
1072                         return -1;
1073                 }
1074
1075                 if (session->shrink_urls)
1076                         tweet = shrink_urls(tweet);
1077
1078                 session->tweet = zalloc(strlen(tweet) + 10);
1079                 if (session->bash)
1080                         sprintf(session->tweet, "%c %s", getuid() ? '$' : '#', tweet);
1081                 else
1082                         sprintf(session->tweet, "%s", tweet);
1083
1084                 free(tweet);
1085                 dbg("tweet = %s\n", session->tweet);
1086         }
1087
1088         if (!session->user)
1089                 session->user = strdup(session->account);
1090
1091         if (session->page == 0)
1092                 session->page = 1;
1093         dbg("account = %s\n", session->account);
1094         dbg("password = %s\n", session->password);
1095         dbg("host = %d\n", session->host);
1096         dbg("action = %d\n", session->action);
1097
1098         /* fork ourself so that the main shell can get on
1099          * with it's life as we try to connect and handle everything
1100          */
1101         if (session->bash) {
1102                 child = fork();
1103                 if (child) {
1104                         dbg("child is %d\n", child);
1105                         exit(0);
1106                 }
1107         }
1108
1109         retval = send_request(session);
1110         if (retval && !session->bash)
1111                 fprintf(stderr, "operation failed\n");
1112
1113         log_session(session, retval);
1114 exit:
1115         session_free(session);
1116         return retval;;
1117 }