bti.c

   1 /*
   2  * Copyright (C) 2008 Greg Kroah-Hartman <greg@kroah.com>
   3  * Copyright (C) 2009 Bart Trojanowski <bart@jukie.net>
   4  * Copyright (C) 2009 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 <readline/readline.h>
  37 #include <libxml/xmlmemory.h>
  38 #include <libxml/parser.h>
  39 #include <libxml/tree.h>
  40 #include <pcre.h>
  41 #include <termios.h>
  42
  43
  44 #define zalloc(size)    calloc(size, 1)
  45
  46 #define dbg(format, arg...)                                             \
  47         do {                                                            \
  48                 if (debug)                                              \
  49                         fprintf(stdout, "bti: %s: " format , __func__ , \
  50                                 ## arg);                                \
  51         } while (0)
  52
  53
  54 static int debug;
  55 static int verbose;
  56
  57 enum host {
  58         HOST_TWITTER  = 0,
  59         HOST_IDENTICA = 1,
  60         HOST_CUSTOM   = 2
  61 };
  62
  63 enum action {
  64         ACTION_UPDATE  = 0,
  65         ACTION_FRIENDS = 1,
  66         ACTION_USER    = 2,
  67         ACTION_REPLIES = 4,
  68         ACTION_PUBLIC  = 8,
  69         ACTION_GROUP   = 16,
  70         ACTION_UNKNOWN = 32
  71 };
  72
  73 struct session {
  74         char *password;
  75         char *account;
  76         char *tweet;
  77         char *proxy;
  78         char *time;
  79         char *homedir;
  80         char *logfile;
  81         char *user;
  82         char *group;
  83         char *hosturl;
  84         int bash;
  85         int shrink_urls;
  86         int dry_run;
  87         int page;
  88         enum host host;
  89         enum action action;
  90 };
  91
  92 struct bti_curl_buffer {
  93         char *data;
  94         enum action action;
  95         int length;
  96 };
  97
  98 static void display_help(void)
  99 {
 100         fprintf(stdout, "bti - send tweet to twitter or identi.ca\n");
 101         fprintf(stdout, "Version: " VERSION "\n");
 102         fprintf(stdout, "Usage:\n");
 103         fprintf(stdout, "  bti [options]\n");
 104         fprintf(stdout, "options are:\n");
 105         fprintf(stdout, "  --account accountname\n");
 106         fprintf(stdout, "  --password password\n");
 107         fprintf(stdout, "  --action action\n");
 108         fprintf(stdout, "    ('update', 'friends', 'public', 'replies', "
 109                 "'group' or 'user')\n");
 110         fprintf(stdout, "  --user screenname\n");
 111         fprintf(stdout, "  --group groupname\n");
 112         fprintf(stdout, "  --proxy PROXY:PORT\n");
 113         fprintf(stdout, "  --host HOST\n");
 114         fprintf(stdout, "  --logfile logfile\n");
 115         fprintf(stdout, "  --shrink-urls\n");
 116         fprintf(stdout, "  --page PAGENUMBER\n");
 117         fprintf(stdout, "  --bash\n");
 118         fprintf(stdout, "  --debug\n");
 119         fprintf(stdout, "  --verbose\n");
 120         fprintf(stdout, "  --dry-run\n");
 121         fprintf(stdout, "  --version\n");
 122         fprintf(stdout, "  --help\n");
 123 }
 124
 125 static void display_version(void)
 126 {
 127         fprintf(stdout, "bti - version %s\n", VERSION);
 128 }
 129
 130 static struct session *session_alloc(void)
 131 {
 132         struct session *session;
 133
 134         session = zalloc(sizeof(*session));
 135         if (!session)
 136                 return NULL;
 137         return session;
 138 }
 139
 140 static void session_free(struct session *session)
 141 {
 142         if (!session)
 143                 return;
 144         free(session->password);
 145         free(session->account);
 146         free(session->tweet);
 147         free(session->proxy);
 148         free(session->time);
 149         free(session->homedir);
 150         free(session->user);
 151         free(session->group);
 152         free(session->hosturl);
 153         free(session);
 154 }
 155
 156 static struct bti_curl_buffer *bti_curl_buffer_alloc(enum action action)
 157 {
 158         struct bti_curl_buffer *buffer;
 159
 160         buffer = zalloc(sizeof(*buffer));
 161         if (!buffer)
 162                 return NULL;
 163
 164         /* start out with a data buffer of 1 byte to
 165          * make the buffer fill logic simpler */
 166         buffer->data = zalloc(1);
 167         if (!buffer->data) {
 168                 free(buffer);
 169                 return NULL;
 170         }
 171         buffer->length = 0;
 172         buffer->action = action;
 173         return buffer;
 174 }
 175
 176 static void bti_curl_buffer_free(struct bti_curl_buffer *buffer)
 177 {
 178         if (!buffer)
 179                 return;
 180         free(buffer->data);
 181         free(buffer);
 182 }
 183
 184 static const char *twitter_host  = "https://twitter.com/statuses";
 185 static const char *identica_host = "https://identi.ca/api/statuses";
 186
 187 static const char *user_uri    = "/user_timeline/";
 188 static const char *update_uri  = "/update.xml";
 189 static const char *public_uri  = "/public_timeline.xml";
 190 static const char *friends_uri = "/friends_timeline.xml";
 191 static const char *replies_uri = "/replies.xml";
 192 static const char *group_uri = "/../laconica/groups/timeline/";
 193
 194 static CURL *curl_init(void)
 195 {
 196         CURL *curl;
 197
 198         curl = curl_easy_init();
 199         if (!curl) {
 200                 fprintf(stderr, "Can not init CURL!\n");
 201                 return NULL;
 202         }
 203         /* some ssl sanity checks on the connection we are making */
 204         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0);
 205         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0);
 206         return curl;
 207 }
 208
 209 static void parse_statuses(xmlDocPtr doc, xmlNodePtr current)
 210 {
 211         xmlChar *text = NULL;
 212         xmlChar *user = NULL;
 213         xmlChar *created = NULL;
 214         xmlNodePtr userinfo;
 215
 216         current = current->xmlChildrenNode;
 217         while (current != NULL) {
 218                 if (current->type == XML_ELEMENT_NODE) {
 219                         if (!xmlStrcmp(current->name, (const xmlChar *)"created_at"))
 220                                 created = xmlNodeListGetString(doc, current->xmlChildrenNode, 1);
 221                         if (!xmlStrcmp(current->name, (const xmlChar *)"text"))
 222                                 text = xmlNodeListGetString(doc, current->xmlChildrenNode, 1);
 223                         if (!xmlStrcmp(current->name, (const xmlChar *)"user")) {
 224                                 userinfo = current->xmlChildrenNode;
 225                                 while (userinfo != NULL) {
 226                                         if ((!xmlStrcmp(userinfo->name, (const xmlChar *)"screen_name"))) {
 227                                                 if (user)
 228                                                         xmlFree(user);
 229                                                 user = xmlNodeListGetString(doc, userinfo->xmlChildrenNode, 1);
 230                                         }
 231                                         userinfo = userinfo->next;
 232                                 }
 233                         }
 234
 235                         if (user && text && created) {
 236                                 if (verbose)
 237                                         printf("[%s] (%.16s) %s\n",
 238                                                 user, created, text);
 239                                 else
 240                                         printf("[%s] %s\n",
 241                                                 user, text);
 242                                 xmlFree(user);
 243                                 xmlFree(text);
 244                                 xmlFree(created);
 245                                 user = NULL;
 246                                 text = NULL;
 247                                 created = NULL;
 248                         }
 249                 }
 250                 current = current->next;
 251         }
 252
 253         return;
 254 }
 255
 256 static void parse_timeline(char *document)
 257 {
 258         xmlDocPtr doc;
 259         xmlNodePtr current;
 260
 261         doc = xmlReadMemory(document, strlen(document), "timeline.xml",
 262                             NULL, XML_PARSE_NOERROR);
 263         if (doc == NULL)
 264                 return;
 265
 266         current = xmlDocGetRootElement(doc);
 267         if (current == NULL) {
 268                 fprintf(stderr, "empty document\n");
 269                 xmlFreeDoc(doc);
 270                 return;
 271         }
 272
 273         if (xmlStrcmp(current->name, (const xmlChar *) "statuses")) {
 274                 fprintf(stderr, "unexpected document type\n");
 275                 xmlFreeDoc(doc);
 276                 return;
 277         }
 278
 279         current = current->xmlChildrenNode;
 280         while (current != NULL) {
 281                 if ((!xmlStrcmp(current->name, (const xmlChar *)"status")))
 282                         parse_statuses(doc, current);
 283                 current = current->next;
 284         }
 285         xmlFreeDoc(doc);
 286
 287         return;
 288 }
 289
 290 static size_t curl_callback(void *buffer, size_t size, size_t nmemb,
 291                             void *userp)
 292 {
 293         struct bti_curl_buffer *curl_buf = userp;
 294         size_t buffer_size = size * nmemb;
 295         char *temp;
 296
 297         if ((!buffer) || (!buffer_size) || (!curl_buf))
 298                 return -EINVAL;
 299
 300         /* add to the data we already have */
 301         temp = zalloc(curl_buf->length + buffer_size + 1);
 302         if (!temp)
 303                 return -ENOMEM;
 304
 305         memcpy(temp, curl_buf->data, curl_buf->length);
 306         free(curl_buf->data);
 307         curl_buf->data = temp;
 308         memcpy(&curl_buf->data[curl_buf->length], (char *)buffer, buffer_size);
 309         curl_buf->length += buffer_size;
 310         if (curl_buf->action)
 311                 parse_timeline(curl_buf->data);
 312
 313         dbg("%s\n", curl_buf->data);
 314
 315         return buffer_size;
 316 }
 317
 318 static int send_request(struct session *session)
 319 {
 320         char endpoint[100];
 321         char user_password[500];
 322         char data[500];
 323         struct bti_curl_buffer *curl_buf;
 324         CURL *curl = NULL;
 325         CURLcode res;
 326         struct curl_httppost *formpost = NULL;
 327         struct curl_httppost *lastptr = NULL;
 328         struct curl_slist *slist = NULL;
 329
 330         if (!session)
 331                 return -EINVAL;
 332
 333         curl_buf = bti_curl_buffer_alloc(session->action);
 334         if (!curl_buf)
 335                 return -ENOMEM;
 336
 337         curl = curl_init();
 338         if (!curl)
 339                 return -EINVAL;
 340
 341         switch (session->action) {
 342         case ACTION_UPDATE:
 343                 snprintf(user_password, sizeof(user_password), "%s:%s",
 344                          session->account, session->password);
 345                 snprintf(data, sizeof(data), "status=\"%s\"", session->tweet);
 346                 curl_formadd(&formpost, &lastptr,
 347                              CURLFORM_COPYNAME, "status",
 348                              CURLFORM_COPYCONTENTS, session->tweet,
 349                              CURLFORM_END);
 350
 351                 curl_formadd(&formpost, &lastptr,
 352                              CURLFORM_COPYNAME, "source",
 353                              CURLFORM_COPYCONTENTS, "bti",
 354                              CURLFORM_END);
 355
 356                 curl_easy_setopt(curl, CURLOPT_HTTPPOST, formpost);
 357                 slist = curl_slist_append(slist, "Expect:");
 358                 curl_easy_setopt(curl, CURLOPT_HTTPHEADER, slist);
 359
 360                 sprintf(endpoint, "%s%s", session->hosturl, update_uri);
 361                 curl_easy_setopt(curl, CURLOPT_URL, endpoint);
 362                 curl_easy_setopt(curl, CURLOPT_USERPWD, user_password);
 363
 364                 break;
 365         case ACTION_FRIENDS:
 366                 snprintf(user_password, sizeof(user_password), "%s:%s",
 367                          session->account, session->password);
 368                 sprintf(endpoint, "%s%s?page=%d", session->hosturl,
 369                         friends_uri, session->page);
 370                 curl_easy_setopt(curl, CURLOPT_URL, endpoint);
 371                 curl_easy_setopt(curl, CURLOPT_USERPWD, user_password);
 372
 373                 break;
 374         case ACTION_USER:
 375                 sprintf(endpoint, "%s%s%s.xml?page=%d", session->hosturl, user_uri,
 376                                 session->user, session->page);
 377                 curl_easy_setopt(curl, CURLOPT_URL, endpoint);
 378
 379                 break;
 380         case ACTION_REPLIES:
 381                 snprintf(user_password, sizeof(user_password), "%s:%s",
 382                          session->account, session->password);
 383                 sprintf(endpoint, "%s%s?page=%d", session->hosturl, replies_uri, session->page);
 384                 curl_easy_setopt(curl, CURLOPT_URL, endpoint);
 385                 curl_easy_setopt(curl, CURLOPT_USERPWD, user_password);
 386
 387                 break;
 388         case ACTION_PUBLIC:
 389                 sprintf(endpoint, "%s%s?page=%d", session->hosturl, public_uri, session->page);
 390                 curl_easy_setopt(curl, CURLOPT_URL, endpoint);
 391
 392                 break;
 393         case ACTION_GROUP:
 394                 sprintf(endpoint, "%s%s%s.xml?page=%d", session->hosturl,
 395                                 group_uri, session->group, session->page);
 396                 curl_easy_setopt(curl, CURLOPT_URL, endpoint);
 397
 398                 break;
 399         default:
 400                 break;
 401         }
 402
 403         if (session->proxy)
 404                 curl_easy_setopt(curl, CURLOPT_PROXY, session->proxy);
 405
 406         if (debug)
 407                 curl_easy_setopt(curl, CURLOPT_VERBOSE, 1);
 408
 409         dbg("user_password = %s\n", user_password);
 410         dbg("data = %s\n", data);
 411         dbg("proxy = %s\n", session->proxy);
 412
 413         curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, curl_callback);
 414         curl_easy_setopt(curl, CURLOPT_WRITEDATA, curl_buf);
 415         if (!session->dry_run) {
 416                 res = curl_easy_perform(curl);
 417                 if (res && !session->bash) {
 418                         fprintf(stderr, "error(%d) trying to perform "
 419                                 "operation\n", res);
 420                         return -EINVAL;
 421                 }
 422         }
 423
 424         curl_easy_cleanup(curl);
 425         if (session->action == ACTION_UPDATE)
 426                 curl_formfree(formpost);
 427         bti_curl_buffer_free(curl_buf);
 428         return 0;
 429 }
 430
 431 static void parse_configfile(struct session *session)
 432 {
 433         FILE *config_file;
 434         char *line = NULL;
 435         size_t len = 0;
 436         char *account = NULL;
 437         char *password = NULL;
 438         char *host = NULL;
 439         char *proxy = NULL;
 440         char *logfile = NULL;
 441         char *action = NULL;
 442         char *user = NULL;
 443         char *file;
 444         int shrink_urls = 0;
 445
 446         /* config file is ~/.bti  */
 447         file = alloca(strlen(session->homedir) + 7);
 448
 449         sprintf(file, "%s/.bti", session->homedir);
 450
 451         config_file = fopen(file, "r");
 452
 453         /* No error if file does not exist or is unreadable.  */
 454         if (config_file == NULL)
 455                 return;
 456
 457         do {
 458                 ssize_t n = getline(&line, &len, config_file);
 459                 if (n < 0)
 460                         break;
 461                 if (line[n - 1] == '\n')
 462                         line[n - 1] = '\0';
 463                 /* Parse file.  Format is the usual value pairs:
 464                    account=name
 465                    passwort=value
 466                    # is a comment character
 467                 */
 468                 *strchrnul(line, '#') = '\0';
 469                 char *c = line;
 470                 while (isspace(*c))
 471                         c++;
 472                 /* Ignore blank lines.  */
 473                 if (c[0] == '\0')
 474                         continue;
 475
 476                 if (!strncasecmp(c, "account", 7) && (c[7] == '=')) {
 477                         c += 8;
 478                         if (c[0] != '\0')
 479                                 account = strdup(c);
 480                 } else if (!strncasecmp(c, "password", 8) &&
 481                            (c[8] == '=')) {
 482                         c += 9;
 483                         if (c[0] != '\0')
 484                                 password = strdup(c);
 485                 } else if (!strncasecmp(c, "host", 4) &&
 486                            (c[4] == '=')) {
 487                         c += 5;
 488                         if (c[0] != '\0')
 489                                 host = strdup(c);
 490                 } else if (!strncasecmp(c, "proxy", 5) &&
 491                            (c[5] == '=')) {
 492                         c += 6;
 493                         if (c[0] != '\0')
 494                                 proxy = strdup(c);
 495                 } else if (!strncasecmp(c, "logfile", 7) &&
 496                            (c[7] == '=')) {
 497                         c += 8;
 498                         if (c[0] != '\0')
 499                                 logfile = strdup(c);
 500                 } else if (!strncasecmp(c, "action", 6) &&
 501                            (c[6] == '=')) {
 502                         c += 7;
 503                         if (c[0] != '\0')
 504                                 action = strdup(c);
 505                 } else if (!strncasecmp(c, "user", 4) &&
 506                                 (c[4] == '=')) {
 507                         c += 5;
 508                         if (c[0] != '\0')
 509                                 user = strdup(c);
 510                 } else if (!strncasecmp(c, "shrink-urls", 11) &&
 511                                 (c[11] == '=')) {
 512                         c += 12;
 513                         if (!strncasecmp(c, "true", 4) ||
 514                                         !strncasecmp(c, "yes", 3))
 515                                 shrink_urls = 1;
 516                 }
 517                 else if (!strncasecmp(c, "verbose", 7) &&
 518                                 (c[7] == '=')) {
 519                         c += 8;
 520                         if (!strncasecmp(c, "true", 4) ||
 521                                         !strncasecmp(c, "yes", 3))
 522                                 verbose = 1;
 523                 }
 524         } while (!feof(config_file));
 525
 526         if (password)
 527                 session->password = password;
 528         if (account)
 529                 session->account = account;
 530         if (host) {
 531                 if (strcasecmp(host, "twitter") == 0) {
 532                         session->host = HOST_TWITTER;
 533                         session->hosturl = strdup(twitter_host);
 534                 } else if (strcasecmp(host, "identica") == 0) {
 535                         session->host = HOST_IDENTICA;
 536                         session->hosturl = strdup(identica_host);
 537                 } else {
 538                         session->host = HOST_CUSTOM;
 539                         session->hosturl = strdup(host);
 540                 }
 541                 free(host);
 542         }
 543         if (proxy) {
 544                 if (session->proxy)
 545                         free(session->proxy);
 546                 session->proxy = proxy;
 547         }
 548         if (logfile)
 549                 session->logfile = logfile;
 550         if (action) {
 551                 if (strcasecmp(action, "update") == 0)
 552                         session->action = ACTION_UPDATE;
 553                 else if (strcasecmp(action, "friends") == 0)
 554                         session->action = ACTION_FRIENDS;
 555                 else if (strcasecmp(action, "user") == 0)
 556                         session->action = ACTION_USER;
 557                 else if (strcasecmp(action, "replies") == 0)
 558                         session->action = ACTION_REPLIES;
 559                 else if (strcasecmp(action, "public") == 0)
 560                         session->action = ACTION_PUBLIC;
 561                 else if (strcasecmp(action, "group") == 0)
 562                         session->action = ACTION_GROUP;
 563                 else
 564                         session->action = ACTION_UNKNOWN;
 565                 free(action);
 566         }
 567         if (user)
 568                 session->user = user;
 569         session->shrink_urls = shrink_urls;
 570
 571         /* Free buffer and close file.  */
 572         free(line);
 573         fclose(config_file);
 574 }
 575
 576 static void log_session(struct session *session, int retval)
 577 {
 578         FILE *log_file;
 579         char *filename;
 580         char *host;
 581
 582         /* Only log something if we have a log file set */
 583         if (!session->logfile)
 584                 return;
 585
 586         filename = alloca(strlen(session->homedir) +
 587                           strlen(session->logfile) + 3);
 588
 589         sprintf(filename, "%s/%s", session->homedir, session->logfile);
 590
 591         log_file = fopen(filename, "a+");
 592         if (log_file == NULL)
 593                 return;
 594         switch (session->host) {
 595         case HOST_TWITTER:
 596                 host = "twitter";
 597                 break;
 598         case HOST_IDENTICA:
 599                 host = "identi.ca";
 600                 break;
 601         default:
 602                 host = session->hosturl;
 603                 break;
 604         }
 605
 606         switch (session->action) {
 607         case ACTION_UPDATE:
 608                 if (retval)
 609                         fprintf(log_file, "%s: host=%s tweet failed\n",
 610                                 session->time, host);
 611                 else
 612                         fprintf(log_file, "%s: host=%s tweet=%s\n",
 613                                 session->time, host, session->tweet);
 614                 break;
 615         case ACTION_FRIENDS:
 616                 fprintf(log_file, "%s: host=%s retrieving friends timeline\n",
 617                         session->time, host);
 618                 break;
 619         case ACTION_USER:
 620                 fprintf(log_file, "%s: host=%s retrieving %s's timeline\n",
 621                         session->time, host, session->user);
 622                 break;
 623         case ACTION_REPLIES:
 624                 fprintf(log_file, "%s: host=%s retrieving replies\n",
 625                         session->time, host);
 626                 break;
 627         case ACTION_PUBLIC:
 628                 fprintf(log_file, "%s: host=%s retrieving public timeline\n",
 629                         session->time, host);
 630                 break;
 631         case ACTION_GROUP:
 632                 fprintf(log_file, "%s: host=%s retrieving group timeline\n",
 633                         session->time, host);
 634                 break;
 635         default:
 636                 break;
 637         }
 638
 639         fclose(log_file);
 640 }
 641
 642 static char *get_string_from_stdin(void)
 643 {
 644         char *temp;
 645         char *string;
 646
 647         string = zalloc(1000);
 648         if (!string)
 649                 return NULL;
 650
 651         if (!fgets(string, 999, stdin))
 652                 return NULL;
 653         temp = strchr(string, '\n');
 654         *temp = '\0';
 655         return string;
 656 }
 657
 658 void read_password(char *buf, size_t len)
 659 {
 660         char pwd[80];
 661         struct termios old;
 662         struct termios tp;
 663
 664         tcgetattr(0, &tp);
 665         old = tp;
 666
 667         tp.c_lflag &= (~ECHO);
 668         tcsetattr(0, TCSANOW, &tp);
 669
 670         fprintf(stdout, "Enter twitter password: ");
 671         fflush(stdout);
 672         scanf("%79s", pwd);
 673         fprintf(stdout, "\n");
 674
 675         tcsetattr(0, TCSANOW, &old);
 676
 677         strncpy(buf, pwd, len);
 678         buf[len-1] = '\0';
 679 }
 680
 681 static int find_urls(const char *tweet, int **pranges)
 682 {
 683         /*
 684          * magic obtained from
 685          * http://www.geekpedia.com/KB65_How-to-validate-an-URL-using-RegEx-in-Csharp.html
 686          */
 687         static const char *re_magic =
 688                 "(([a-zA-Z][0-9a-zA-Z+\\-\\.]*:)/{1,3}"
 689                 "[0-9a-zA-Z;/~?:@&=+$\\.\\-_'()%]+)"
 690                 "(#[0-9a-zA-Z;/?:@&=+$\\.\\-_!~*'()%]+)?";
 691         pcre *re;
 692         const char *errptr;
 693         int erroffset;
 694         int ovector[10] = {0,};
 695         const size_t ovsize = sizeof(ovector)/sizeof(*ovector);
 696         int startoffset, tweetlen;
 697         int i, rc;
 698         int rbound = 10;
 699         int rcount = 0;
 700         int *ranges = malloc(sizeof(int) * rbound);
 701
 702         re = pcre_compile(re_magic,
 703                         PCRE_NO_AUTO_CAPTURE,
 704                         &errptr, &erroffset, NULL);
 705         if (!re) {
 706                 fprintf(stderr, "pcre_compile @%u: %s\n", erroffset, errptr);
 707                 exit(1);
 708         }
 709
 710         tweetlen = strlen(tweet);
 711         for (startoffset = 0; startoffset < tweetlen; ) {
 712
 713                 rc = pcre_exec(re, NULL, tweet, strlen(tweet), startoffset, 0,
 714                                 ovector, ovsize);
 715                 if (rc == PCRE_ERROR_NOMATCH)
 716                         break;
 717
 718                 if (rc < 0) {
 719                         fprintf(stderr, "pcre_exec @%u: %s\n",
 720                                 erroffset, errptr);
 721                         exit(1);
 722                 }
 723
 724                 for (i = 0; i < rc; i += 2) {
 725                         if ((rcount+2) == rbound) {
 726                                 rbound *= 2;
 727                                 ranges = realloc(ranges, sizeof(int) * rbound);
 728                         }
 729
 730                         ranges[rcount++] = ovector[i];
 731                         ranges[rcount++] = ovector[i+1];
 732                 }
 733
 734                 startoffset = ovector[1];
 735         }
 736
 737         pcre_free(re);
 738
 739         *pranges = ranges;
 740         return rcount;
 741 }
 742
 743 /**
 744  * bidirectional popen() call
 745  *
 746  * @param rwepipe - int array of size three
 747  * @param exe - program to run
 748  * @param argv - argument list
 749  * @return pid or -1 on error
 750  *
 751  * The caller passes in an array of three integers (rwepipe), on successful
 752  * execution it can then write to element 0 (stdin of exe), and read from
 753  * element 1 (stdout) and 2 (stderr).
 754  */
 755 static int popenRWE(int *rwepipe, const char *exe, const char *const argv[])
 756 {
 757         int in[2];
 758         int out[2];
 759         int err[2];
 760         int pid;
 761         int rc;
 762
 763         rc = pipe(in);
 764         if (rc < 0)
 765                 goto error_in;
 766
 767         rc = pipe(out);
 768         if (rc < 0)
 769                 goto error_out;
 770
 771         rc = pipe(err);
 772         if (rc < 0)
 773                 goto error_err;
 774
 775         pid = fork();
 776         if (pid > 0) {
 777                 /* parent */
 778                 close(in[0]);
 779                 close(out[1]);
 780                 close(err[1]);
 781                 rwepipe[0] = in[1];
 782                 rwepipe[1] = out[0];
 783                 rwepipe[2] = err[0];
 784                 return pid;
 785         } else if (pid == 0) {
 786                 /* child */
 787                 close(in[1]);
 788                 close(out[0]);
 789                 close(err[0]);
 790                 close(0);
 791                 rc = dup(in[0]);
 792                 close(1);
 793                 rc = dup(out[1]);
 794                 close(2);
 795                 rc = dup(err[1]);
 796
 797                 execvp(exe, (char **)argv);
 798                 exit(1);
 799         } else
 800                 goto error_fork;
 801
 802         return pid;
 803
 804 error_fork:
 805         close(err[0]);
 806         close(err[1]);
 807 error_err:
 808         close(out[0]);
 809         close(out[1]);
 810 error_out:
 811         close(in[0]);
 812         close(in[1]);
 813 error_in:
 814         return -1;
 815 }
 816
 817 static int pcloseRWE(int pid, int *rwepipe)
 818 {
 819         int rc, status;
 820         close(rwepipe[0]);
 821         close(rwepipe[1]);
 822         close(rwepipe[2]);
 823         rc = waitpid(pid, &status, 0);
 824         return status;
 825 }
 826
 827 static char *shrink_one_url(int *rwepipe, char *big)
 828 {
 829         int biglen = strlen(big);
 830         char *small;
 831         int smalllen;
 832         int rc;
 833
 834         rc = dprintf(rwepipe[0], "%s\n", big);
 835         if (rc < 0)
 836                 return big;
 837
 838         smalllen = biglen + 128;
 839         small = malloc(smalllen);
 840         if (!small)
 841                 return big;
 842
 843         rc = read(rwepipe[1], small, smalllen);
 844         if (rc < 0 || rc > biglen)
 845                 goto error_free_small;
 846
 847         if (strncmp(small, "http://", 7))
 848                 goto error_free_small;
 849
 850         smalllen = rc;
 851         while (smalllen && isspace(small[smalllen-1]))
 852                         small[--smalllen] = 0;
 853
 854         free(big);
 855         return small;
 856
 857 error_free_small:
 858         free(small);
 859         return big;
 860 }
 861
 862 static char *shrink_urls(char *text)
 863 {
 864         int *ranges;
 865         int rcount;
 866         int i;
 867         int inofs = 0;
 868         int outofs = 0;
 869         const char *const shrink_args[] = {
 870                 "bti-shrink-urls",
 871                 NULL
 872         };
 873         int shrink_pid;
 874         int shrink_pipe[3];
 875         int inlen = strlen(text);
 876
 877         dbg("before len=%u\n", inlen);
 878
 879         shrink_pid = popenRWE(shrink_pipe, shrink_args[0], shrink_args);
 880         if (shrink_pid < 0)
 881                 return text;
 882
 883         rcount = find_urls(text, &ranges);
 884         if (!rcount)
 885                 return text;
 886
 887         for (i = 0; i < rcount; i += 2) {
 888                 int url_start = ranges[i];
 889                 int url_end = ranges[i+1];
 890                 int long_url_len = url_end - url_start;
 891                 char *url = strndup(text + url_start, long_url_len);
 892                 int short_url_len;
 893                 int not_url_len = url_start - inofs;
 894
 895                 dbg("long  url[%u]: %s\n", long_url_len, url);
 896                 url = shrink_one_url(shrink_pipe, url);
 897                 short_url_len = url ? strlen(url) : 0;
 898                 dbg("short url[%u]: %s\n", short_url_len, url);
 899
 900                 if (!url || short_url_len >= long_url_len) {
 901                         /* The short url ended up being too long
 902                          * or unavailable */
 903                         if (inofs) {
 904                                 strncpy(text + outofs, text + inofs,
 905                                                 not_url_len + long_url_len);
 906                         }
 907                         inofs += not_url_len + long_url_len;
 908                         outofs += not_url_len + long_url_len;
 909
 910                 } else {
 911                         /* copy the unmodified block */
 912                         strncpy(text + outofs, text + inofs, not_url_len);
 913                         inofs += not_url_len;
 914                         outofs += not_url_len;
 915
 916                         /* copy the new url */
 917                         strncpy(text + outofs, url, short_url_len);
 918                         inofs += long_url_len;
 919                         outofs += short_url_len;
 920                 }
 921
 922                 free(url);
 923         }
 924
 925         /* copy the last block after the last match */
 926         if (inofs) {
 927                 int tail = inlen - inofs;
 928                 if (tail) {
 929                         strncpy(text + outofs, text + inofs, tail);
 930                         outofs += tail;
 931                 }
 932         }
 933
 934         free(ranges);
 935
 936         (void)pcloseRWE(shrink_pid, shrink_pipe);
 937
 938         text[outofs] = 0;
 939         dbg("after len=%u\n", outofs);
 940         return text;
 941 }
 942
 943 int main(int argc, char *argv[], char *envp[])
 944 {
 945         static const struct option options[] = {
 946                 { "debug", 0, NULL, 'd' },
 947                 { "verbose", 0, NULL, 'V' },
 948                 { "account", 1, NULL, 'a' },
 949                 { "password", 1, NULL, 'p' },
 950                 { "host", 1, NULL, 'H' },
 951                 { "proxy", 1, NULL, 'P' },
 952                 { "action", 1, NULL, 'A' },
 953                 { "user", 1, NULL, 'u' },
 954                 { "group", 1, NULL, 'G' },
 955                 { "logfile", 1, NULL, 'L' },
 956                 { "shrink-urls", 0, NULL, 's' },
 957                 { "help", 0, NULL, 'h' },
 958                 { "bash", 0, NULL, 'b' },
 959                 { "dry-run", 0, NULL, 'n' },
 960                 { "page", 1, NULL, 'g' },
 961                 { "version", 0, NULL, 'v' },
 962                 { }
 963         };
 964         struct session *session;
 965         pid_t child;
 966         char *tweet;
 967         static char password[80];
 968         int retval = 0;
 969         int option;
 970         char *http_proxy;
 971         time_t t;
 972         int page_nr;
 973
 974         debug = 0;
 975         verbose = 0;
 976         rl_bind_key('\t', rl_insert);
 977
 978         session = session_alloc();
 979         if (!session) {
 980                 fprintf(stderr, "no more memory...\n");
 981                 return -1;
 982         }
 983
 984         /* get the current time so that we can log it later */
 985         time(&t);
 986         session->time = strdup(ctime(&t));
 987         session->time[strlen(session->time)-1] = 0x00;
 988
 989         session->homedir = strdup(getenv("HOME"));
 990
 991         curl_global_init(CURL_GLOBAL_ALL);
 992
 993         /* Set environment variables first, before reading command line options
 994          * or config file values. */
 995         http_proxy = getenv("http_proxy");
 996         if (http_proxy) {
 997                 if (session->proxy)
 998                         free(session->proxy);
 999                 session->proxy = strdup(http_proxy);
1000                 dbg("http_proxy = %s\n", session->proxy);
1001         }
1002
1003         parse_configfile(session);
1004
1005         while (1) {
1006                 option = getopt_long_only(argc, argv, "dp:P:H:a:A:u:hg:G:snVv",
1007                                           options, NULL);
1008                 if (option == -1)
1009                         break;
1010                 switch (option) {
1011                 case 'd':
1012                         debug = 1;
1013                         break;
1014                 case 'V':
1015                         verbose = 1;
1016                         break;
1017                 case 'a':
1018                         if (session->account)
1019                                 free(session->account);
1020                         session->account = strdup(optarg);
1021                         dbg("account = %s\n", session->account);
1022                         break;
1023                 case 'g':
1024                         page_nr = atoi(optarg);
1025                         dbg("page = %d\n", page_nr);
1026                         session->page = page_nr;
1027                         break;
1028                 case 'p':
1029                         if (session->password)
1030                                 free(session->password);
1031                         session->password = strdup(optarg);
1032                         dbg("password = %s\n", session->password);
1033                         break;
1034                 case 'P':
1035                         if (session->proxy)
1036                                 free(session->proxy);
1037                         session->proxy = strdup(optarg);
1038                         dbg("proxy = %s\n", session->proxy);
1039                         break;
1040                 case 'A':
1041                         if (strcasecmp(optarg, "update") == 0)
1042                                 session->action = ACTION_UPDATE;
1043                         else if (strcasecmp(optarg, "friends") == 0)
1044                                 session->action = ACTION_FRIENDS;
1045                         else if (strcasecmp(optarg, "user") == 0)
1046                                 session->action = ACTION_USER;
1047                         else if (strcasecmp(optarg, "replies") == 0)
1048                                 session->action = ACTION_REPLIES;
1049                         else if (strcasecmp(optarg, "public") == 0)
1050                                 session->action = ACTION_PUBLIC;
1051                         else if (strcasecmp(optarg, "group") == 0)
1052                                 session->action = ACTION_GROUP;
1053                         else
1054                                 session->action = ACTION_UNKNOWN;
1055                         dbg("action = %d\n", session->action);
1056                         break;
1057                 case 'u':
1058                         if (session->user)
1059                                 free(session->user);
1060                         session->user = strdup(optarg);
1061                         dbg("user = %s\n", session->user);
1062                         break;
1063
1064                 case 'G':
1065                         if (session->group)
1066                                 free(session->group);
1067                         session->group = strdup(optarg);
1068                         dbg("group = %s\n", session->group);
1069                         break;
1070                 case 'L':
1071                         if (session->logfile)
1072                                 free(session->logfile);
1073                         session->logfile = strdup(optarg);
1074                         dbg("logfile = %s\n", session->logfile);
1075                         break;
1076                 case 's':
1077                         session->shrink_urls = 1;
1078                         break;
1079                 case 'H':
1080                         if (session->hosturl)
1081                                 free(session->hosturl);
1082                         if (strcasecmp(optarg, "twitter") == 0) {
1083                                 session->host = HOST_TWITTER;
1084                                 session->hosturl = strdup(twitter_host);
1085                         } else if (strcasecmp(optarg, "identica") == 0) {
1086                                 session->host = HOST_IDENTICA;
1087                                 session->hosturl = strdup(identica_host);
1088                         } else {
1089                                 session->host = HOST_CUSTOM;
1090                                 session->hosturl = strdup(optarg);
1091                         }
1092                         dbg("host = %d\n", session->host);
1093                         break;
1094                 case 'b':
1095                         session->bash = 1;
1096                         break;
1097                 case 'h':
1098                         display_help();
1099                         goto exit;
1100                 case 'n':
1101                         session->dry_run = 1;
1102                         break;
1103                 case 'v':
1104                         display_version();
1105                         goto exit;
1106                 default:
1107                         display_help();
1108                         goto exit;
1109                 }
1110         }
1111
1112         /*
1113          * Show the version to make it easier to determine what
1114          * is going on here
1115          */
1116         if (debug) {
1117                 display_version();
1118                 fprintf(stderr, "%s", session->group);
1119         }
1120
1121         if (session->action == ACTION_UNKNOWN) {
1122                 fprintf(stderr, "Unknown action, valid actions are:\n");
1123                 fprintf(stderr, "'update', 'friends', 'public', "
1124                         "'replies', 'group' or 'user'.\n");
1125                 goto exit;
1126         }
1127
1128         if (session->host == HOST_TWITTER && session->action == ACTION_GROUP) {
1129                 fprintf(stderr, "Groups only work in Identi.ca.\n");
1130                 goto exit;
1131         }
1132
1133         if (session->action == ACTION_GROUP && !session->group) {
1134                 fprintf(stdout, "Enter group name: ");
1135                 session->group = readline(NULL);
1136         }
1137
1138         if (!session->account) {
1139                 fprintf(stdout, "Enter twitter account: ");
1140                 session->account = readline(NULL);
1141         }
1142
1143         if (!session->password) {
1144                 read_password(password, sizeof(password));
1145                 session->password = strdup(password);
1146                 free(password);
1147         }
1148
1149         if (session->action == ACTION_UPDATE) {
1150                 if (session->bash)
1151                         tweet = get_string_from_stdin();
1152                 else
1153                         tweet = readline("tweet: ");
1154                 if (!tweet || strlen(tweet) == 0) {
1155                         dbg("no tweet?\n");
1156                         return -1;
1157                 }
1158
1159                 if (session->shrink_urls)
1160                         tweet = shrink_urls(tweet);
1161
1162                 session->tweet = zalloc(strlen(tweet) + 10);
1163                 if (session->bash)
1164                         sprintf(session->tweet, "%c %s", getuid() ? '$' : '#', tweet);
1165                 else
1166                         sprintf(session->tweet, "%s", tweet);
1167
1168                 free(tweet);
1169                 dbg("tweet = %s\n", session->tweet);
1170         }
1171
1172         if (!session->user)
1173                 session->user = strdup(session->account);
1174
1175         if (session->page == 0)
1176                 session->page = 1;
1177         dbg("account = %s\n", session->account);
1178         dbg("password = %s\n", session->password);
1179         dbg("host = %d\n", session->host);
1180         dbg("action = %d\n", session->action);
1181
1182         /* fork ourself so that the main shell can get on
1183          * with it's life as we try to connect and handle everything
1184          */
1185         if (session->bash) {
1186                 child = fork();
1187                 if (child) {
1188                         dbg("child is %d\n", child);
1189                         exit(0);
1190                 }
1191         }
1192
1193         retval = send_request(session);
1194         if (retval && !session->bash)
1195                 fprintf(stderr, "operation failed\n");
1196
1197         log_session(session, retval);
1198 exit:
1199         session_free(session);
1200         return retval;;
1201 }