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