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         char *hostname;
  85         int bash;
  86         int shrink_urls;
  87         int dry_run;
  88         int page;
  89         enum host host;
  90         enum action action;
  91 };
  92
  93 struct bti_curl_buffer {
  94         char *data;
  95         enum action action;
  96         int length;
  97 };
  98
  99 static void display_help(void)
 100 {
 101         fprintf(stdout, "bti - send tweet to twitter or identi.ca\n");
 102         fprintf(stdout, "Version: " VERSION "\n");
 103         fprintf(stdout, "Usage:\n");
 104         fprintf(stdout, "  bti [options]\n");
 105         fprintf(stdout, "options are:\n");
 106         fprintf(stdout, "  --account accountname\n");
 107         fprintf(stdout, "  --password password\n");
 108         fprintf(stdout, "  --action action\n");
 109         fprintf(stdout, "    ('update', 'friends', 'public', 'replies', "
 110                 "'group' or 'user')\n");
 111         fprintf(stdout, "  --user screenname\n");
 112         fprintf(stdout, "  --group groupname\n");
 113         fprintf(stdout, "  --proxy PROXY:PORT\n");
 114         fprintf(stdout, "  --host HOST\n");
 115         fprintf(stdout, "  --logfile logfile\n");
 116         fprintf(stdout, "  --shrink-urls\n");
 117         fprintf(stdout, "  --page PAGENUMBER\n");
 118         fprintf(stdout, "  --bash\n");
 119         fprintf(stdout, "  --debug\n");
 120         fprintf(stdout, "  --verbose\n");
 121         fprintf(stdout, "  --dry-run\n");
 122         fprintf(stdout, "  --version\n");
 123         fprintf(stdout, "  --help\n");
 124 }
 125
 126 static void display_version(void)
 127 {
 128         fprintf(stdout, "bti - version %s\n", VERSION);
 129 }
 130
 131 static struct session *session_alloc(void)
 132 {
 133         struct session *session;
 134
 135         session = zalloc(sizeof(*session));
 136         if (!session)
 137                 return NULL;
 138         return session;
 139 }
 140
 141 static void session_free(struct session *session)
 142 {
 143         if (!session)
 144                 return;
 145         free(session->password);
 146         free(session->account);
 147         free(session->tweet);
 148         free(session->proxy);
 149         free(session->time);
 150         free(session->homedir);
 151         free(session->user);
 152         free(session->group);
 153         free(session->hosturl);
 154         free(session->hostname);
 155         free(session);
 156 }
 157
 158 static struct bti_curl_buffer *bti_curl_buffer_alloc(enum action action)
 159 {
 160         struct bti_curl_buffer *buffer;
 161
 162         buffer = zalloc(sizeof(*buffer));
 163         if (!buffer)
 164                 return NULL;
 165
 166         /* start out with a data buffer of 1 byte to
 167          * make the buffer fill logic simpler */
 168         buffer->data = zalloc(1);
 169         if (!buffer->data) {
 170                 free(buffer);
 171                 return NULL;
 172         }
 173         buffer->length = 0;
 174         buffer->action = action;
 175         return buffer;
 176 }
 177
 178 static void bti_curl_buffer_free(struct bti_curl_buffer *buffer)
 179 {
 180         if (!buffer)
 181                 return;
 182         free(buffer->data);
 183         free(buffer);
 184 }
 185
 186 static const char *twitter_host  = "https://twitter.com/statuses";
 187 static const char *identica_host = "https://identi.ca/api/statuses";
 188 static const char *twitter_name  = "twitter";
 189 static const char *identica_name = "identi.ca";
 190
 191 static const char *user_uri    = "/user_timeline/";
 192 static const char *update_uri  = "/update.xml";
 193 static const char *public_uri  = "/public_timeline.xml";
 194 static const char *friends_uri = "/friends_timeline.xml";
 195 static const char *replies_uri = "/replies.xml";
 196 static const char *group_uri = "/../laconica/groups/timeline/";
 197
 198 static CURL *curl_init(void)
 199 {
 200         CURL *curl;
 201
 202         curl = curl_easy_init();
 203         if (!curl) {
 204                 fprintf(stderr, "Can not init CURL!\n");
 205                 return NULL;
 206         }
 207         /* some ssl sanity checks on the connection we are making */
 208         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0);
 209         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0);
 210         return curl;
 211 }
 212
 213 static void parse_statuses(xmlDocPtr doc, xmlNodePtr current)
 214 {
 215         xmlChar *text = NULL;
 216         xmlChar *user = NULL;
 217         xmlChar *created = NULL;
 218         xmlNodePtr userinfo;
 219
 220         current = current->xmlChildrenNode;
 221         while (current != NULL) {
 222                 if (current->type == XML_ELEMENT_NODE) {
 223                         if (!xmlStrcmp(current->name, (const xmlChar *)"created_at"))
 224                                 created = xmlNodeListGetString(doc, current->xmlChildrenNode, 1);
 225                         if (!xmlStrcmp(current->name, (const xmlChar *)"text"))
 226                                 text = xmlNodeListGetString(doc, current->xmlChildrenNode, 1);
 227                         if (!xmlStrcmp(current->name, (const xmlChar *)"user")) {
 228                                 userinfo = current->xmlChildrenNode;
 229                                 while (userinfo != NULL) {
 230                                         if ((!xmlStrcmp(userinfo->name, (const xmlChar *)"screen_name"))) {
 231                                                 if (user)
 232                                                         xmlFree(user);
 233                                                 user = xmlNodeListGetString(doc, userinfo->xmlChildrenNode, 1);
 234                                         }
 235                                         userinfo = userinfo->next;
 236                                 }
 237                         }
 238
 239                         if (user && text && created) {
 240                                 if (verbose)
 241                                         printf("[%s] (%.16s) %s\n",
 242                                                 user, created, text);
 243                                 else
 244                                         printf("[%s] %s\n",
 245                                                 user, text);
 246                                 xmlFree(user);
 247                                 xmlFree(text);
 248                                 xmlFree(created);
 249                                 user = NULL;
 250                                 text = NULL;
 251                                 created = NULL;
 252                         }
 253                 }
 254                 current = current->next;
 255         }
 256
 257         return;
 258 }
 259
 260 static void parse_timeline(char *document)
 261 {
 262         xmlDocPtr doc;
 263         xmlNodePtr current;
 264
 265         doc = xmlReadMemory(document, strlen(document), "timeline.xml",
 266                             NULL, XML_PARSE_NOERROR);
 267         if (doc == NULL)
 268                 return;
 269
 270         current = xmlDocGetRootElement(doc);
 271         if (current == NULL) {
 272                 fprintf(stderr, "empty document\n");
 273                 xmlFreeDoc(doc);
 274                 return;
 275         }
 276
 277         if (xmlStrcmp(current->name, (const xmlChar *) "statuses")) {
 278                 fprintf(stderr, "unexpected document type\n");
 279                 xmlFreeDoc(doc);
 280                 return;
 281         }
 282
 283         current = current->xmlChildrenNode;
 284         while (current != NULL) {
 285                 if ((!xmlStrcmp(current->name, (const xmlChar *)"status")))
 286                         parse_statuses(doc, current);
 287                 current = current->next;
 288         }
 289         xmlFreeDoc(doc);
 290
 291         return;
 292 }
 293
 294 static size_t curl_callback(void *buffer, size_t size, size_t nmemb,
 295                             void *userp)
 296 {
 297         struct bti_curl_buffer *curl_buf = userp;
 298         size_t buffer_size = size * nmemb;
 299         char *temp;
 300
 301         if ((!buffer) || (!buffer_size) || (!curl_buf))
 302                 return -EINVAL;
 303
 304         /* add to the data we already have */
 305         temp = zalloc(curl_buf->length + buffer_size + 1);
 306         if (!temp)
 307                 return -ENOMEM;
 308
 309         memcpy(temp, curl_buf->data, curl_buf->length);
 310         free(curl_buf->data);
 311         curl_buf->data = temp;
 312         memcpy(&curl_buf->data[curl_buf->length], (char *)buffer, buffer_size);
 313         curl_buf->length += buffer_size;
 314         if (curl_buf->action)
 315                 parse_timeline(curl_buf->data);
 316
 317         dbg("%s\n", curl_buf->data);
 318
 319         return buffer_size;
 320 }
 321
 322 static int send_request(struct session *session)
 323 {
 324         char endpoint[100];
 325         char user_password[500];
 326         char data[500];
 327         struct bti_curl_buffer *curl_buf;
 328         CURL *curl = NULL;
 329         CURLcode res;
 330         struct curl_httppost *formpost = NULL;
 331         struct curl_httppost *lastptr = NULL;
 332         struct curl_slist *slist = NULL;
 333
 334         if (!session)
 335                 return -EINVAL;
 336
 337         curl_buf = bti_curl_buffer_alloc(session->action);
 338         if (!curl_buf)
 339                 return -ENOMEM;
 340
 341         curl = curl_init();
 342         if (!curl)
 343                 return -EINVAL;
 344
 345         switch (session->action) {
 346         case ACTION_UPDATE:
 347                 snprintf(user_password, sizeof(user_password), "%s:%s",
 348                          session->account, session->password);
 349                 snprintf(data, sizeof(data), "status=\"%s\"", session->tweet);
 350                 curl_formadd(&formpost, &lastptr,
 351                              CURLFORM_COPYNAME, "status",
 352                              CURLFORM_COPYCONTENTS, session->tweet,
 353                              CURLFORM_END);
 354
 355                 curl_formadd(&formpost, &lastptr,
 356                              CURLFORM_COPYNAME, "source",
 357                              CURLFORM_COPYCONTENTS, "bti",
 358                              CURLFORM_END);
 359
 360                 curl_easy_setopt(curl, CURLOPT_HTTPPOST, formpost);
 361                 slist = curl_slist_append(slist, "Expect:");
 362                 curl_easy_setopt(curl, CURLOPT_HTTPHEADER, slist);
 363
 364                 sprintf(endpoint, "%s%s", session->hosturl, update_uri);
 365                 curl_easy_setopt(curl, CURLOPT_URL, endpoint);
 366                 curl_easy_setopt(curl, CURLOPT_USERPWD, user_password);
 367
 368                 break;
 369         case ACTION_FRIENDS:
 370                 snprintf(user_password, sizeof(user_password), "%s:%s",
 371                          session->account, session->password);
 372                 sprintf(endpoint, "%s%s?page=%d", session->hosturl,
 373                         friends_uri, session->page);
 374                 curl_easy_setopt(curl, CURLOPT_URL, endpoint);
 375                 curl_easy_setopt(curl, CURLOPT_USERPWD, user_password);
 376
 377                 break;
 378         case ACTION_USER:
 379                 sprintf(endpoint, "%s%s%s.xml?page=%d", session->hosturl,
 380                         user_uri, session->user, session->page);
 381                 curl_easy_setopt(curl, CURLOPT_URL, endpoint);
 382
 383                 break;
 384         case ACTION_REPLIES:
 385                 snprintf(user_password, sizeof(user_password), "%s:%s",
 386                          session->account, session->password);
 387                 sprintf(endpoint, "%s%s?page=%d", session->hosturl, replies_uri,
 388                         session->page);
 389                 curl_easy_setopt(curl, CURLOPT_URL, endpoint);
 390                 curl_easy_setopt(curl, CURLOPT_USERPWD, user_password);
 391
 392                 break;
 393         case ACTION_PUBLIC:
 394                 sprintf(endpoint, "%s%s?page=%d", session->hosturl, public_uri,
 395                         session->page);
 396                 curl_easy_setopt(curl, CURLOPT_URL, endpoint);
 397
 398                 break;
 399         case ACTION_GROUP:
 400                 sprintf(endpoint, "%s%s%s.xml?page=%d", session->hosturl,
 401                                 group_uri, session->group, session->page);
 402                 curl_easy_setopt(curl, CURLOPT_URL, endpoint);
 403
 404                 break;
 405         default:
 406                 break;
 407         }
 408
 409         if (session->proxy)
 410                 curl_easy_setopt(curl, CURLOPT_PROXY, session->proxy);
 411
 412         if (debug)
 413                 curl_easy_setopt(curl, CURLOPT_VERBOSE, 1);
 414
 415         dbg("user_password = %s\n", user_password);
 416         dbg("data = %s\n", data);
 417         dbg("proxy = %s\n", session->proxy);
 418
 419         curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, curl_callback);
 420         curl_easy_setopt(curl, CURLOPT_WRITEDATA, curl_buf);
 421         if (!session->dry_run) {
 422                 res = curl_easy_perform(curl);
 423                 if (res && !session->bash) {
 424                         fprintf(stderr, "error(%d) trying to perform "
 425                                 "operation\n", res);
 426                         return -EINVAL;
 427                 }
 428         }
 429
 430         curl_easy_cleanup(curl);
 431         if (session->action == ACTION_UPDATE)
 432                 curl_formfree(formpost);
 433         bti_curl_buffer_free(curl_buf);
 434         return 0;
 435 }
 436
 437 static void parse_configfile(struct session *session)
 438 {
 439         FILE *config_file;
 440         char *line = NULL;
 441         size_t len = 0;
 442         char *account = NULL;
 443         char *password = NULL;
 444         char *host = NULL;
 445         char *proxy = NULL;
 446         char *logfile = NULL;
 447         char *action = NULL;
 448         char *user = NULL;
 449         char *file;
 450         int shrink_urls = 0;
 451
 452         /* config file is ~/.bti  */
 453         file = alloca(strlen(session->homedir) + 7);
 454
 455         sprintf(file, "%s/.bti", session->homedir);
 456
 457         config_file = fopen(file, "r");
 458
 459         /* No error if file does not exist or is unreadable.  */
 460         if (config_file == NULL)
 461                 return;
 462
 463         do {
 464                 ssize_t n = getline(&line, &len, config_file);
 465                 if (n < 0)
 466                         break;
 467                 if (line[n - 1] == '\n')
 468                         line[n - 1] = '\0';
 469                 /* Parse file.  Format is the usual value pairs:
 470                    account=name
 471                    passwort=value
 472                    # is a comment character
 473                 */
 474                 *strchrnul(line, '#') = '\0';
 475                 char *c = line;
 476                 while (isspace(*c))
 477                         c++;
 478                 /* Ignore blank lines.  */
 479                 if (c[0] == '\0')
 480                         continue;
 481
 482                 if (!strncasecmp(c, "account", 7) && (c[7] == '=')) {
 483                         c += 8;
 484                         if (c[0] != '\0')
 485                                 account = strdup(c);
 486                 } else if (!strncasecmp(c, "password", 8) &&
 487                            (c[8] == '=')) {
 488                         c += 9;
 489                         if (c[0] != '\0')
 490                                 password = strdup(c);
 491                 } else if (!strncasecmp(c, "host", 4) &&
 492                            (c[4] == '=')) {
 493                         c += 5;
 494                         if (c[0] != '\0')
 495                                 host = strdup(c);
 496                 } else if (!strncasecmp(c, "proxy", 5) &&
 497                            (c[5] == '=')) {
 498                         c += 6;
 499                         if (c[0] != '\0')
 500                                 proxy = strdup(c);
 501                 } else if (!strncasecmp(c, "logfile", 7) &&
 502                            (c[7] == '=')) {
 503                         c += 8;
 504                         if (c[0] != '\0')
 505                                 logfile = strdup(c);
 506                 } else if (!strncasecmp(c, "action", 6) &&
 507                            (c[6] == '=')) {
 508                         c += 7;
 509                         if (c[0] != '\0')
 510                                 action = strdup(c);
 511                 } else if (!strncasecmp(c, "user", 4) &&
 512                                 (c[4] == '=')) {
 513                         c += 5;
 514                         if (c[0] != '\0')
 515                                 user = strdup(c);
 516                 } else if (!strncasecmp(c, "shrink-urls", 11) &&
 517                                 (c[11] == '=')) {
 518                         c += 12;
 519                         if (!strncasecmp(c, "true", 4) ||
 520                                         !strncasecmp(c, "yes", 3))
 521                                 shrink_urls = 1;
 522                 } else if (!strncasecmp(c, "verbose", 7) &&
 523                                 (c[7] == '=')) {
 524                         c += 8;
 525                         if (!strncasecmp(c, "true", 4) ||
 526                                         !strncasecmp(c, "yes", 3))
 527                                 verbose = 1;
 528                 }
 529         } while (!feof(config_file));
 530
 531         if (password)
 532                 session->password = password;
 533         if (account)
 534                 session->account = account;
 535         if (host) {
 536                 if (strcasecmp(host, "twitter") == 0) {
 537                         session->host = HOST_TWITTER;
 538                         session->hosturl = strdup(twitter_host);
 539                         session->hostname = strdup(twitter_name);
 540                 } else if (strcasecmp(host, "identica") == 0) {
 541                         session->host = HOST_IDENTICA;
 542                         session->hosturl = strdup(identica_host);
 543                         session->hostname = strdup(identica_name);
 544                 } else {
 545                         session->host = HOST_CUSTOM;
 546                         session->hosturl = strdup(host);
 547                         session->hostname = strdup(host);
 548                 }
 549                 free(host);
 550         }
 551         if (proxy) {
 552                 if (session->proxy)
 553                         free(session->proxy);
 554                 session->proxy = proxy;
 555         }
 556         if (logfile)
 557                 session->logfile = logfile;
 558         if (action) {
 559                 if (strcasecmp(action, "update") == 0)
 560                         session->action = ACTION_UPDATE;
 561                 else if (strcasecmp(action, "friends") == 0)
 562                         session->action = ACTION_FRIENDS;
 563                 else if (strcasecmp(action, "user") == 0)
 564                         session->action = ACTION_USER;
 565                 else if (strcasecmp(action, "replies") == 0)
 566                         session->action = ACTION_REPLIES;
 567                 else if (strcasecmp(action, "public") == 0)
 568                         session->action = ACTION_PUBLIC;
 569                 else if (strcasecmp(action, "group") == 0)
 570                         session->action = ACTION_GROUP;
 571                 else
 572                         session->action = ACTION_UNKNOWN;
 573                 free(action);
 574         }
 575         if (user)
 576                 session->user = user;
 577         session->shrink_urls = shrink_urls;
 578
 579         /* Free buffer and close file.  */
 580         free(line);
 581         fclose(config_file);
 582 }
 583
 584 static void log_session(struct session *session, int retval)
 585 {
 586         FILE *log_file;
 587         char *filename;
 588
 589         /* Only log something if we have a log file set */
 590         if (!session->logfile)
 591                 return;
 592
 593         filename = alloca(strlen(session->homedir) +
 594                           strlen(session->logfile) + 3);
 595
 596         sprintf(filename, "%s/%s", session->homedir, session->logfile);
 597
 598         log_file = fopen(filename, "a+");
 599         if (log_file == NULL)
 600                 return;
 601
 602         switch (session->action) {
 603         case ACTION_UPDATE:
 604                 if (retval)
 605                         fprintf(log_file, "%s: host=%s tweet failed\n",
 606                                 session->time, session->hostname);
 607                 else
 608                         fprintf(log_file, "%s: host=%s tweet=%s\n",
 609                                 session->time, session->hostname, session->tweet);
 610                 break;
 611         case ACTION_FRIENDS:
 612                 fprintf(log_file, "%s: host=%s retrieving friends timeline\n",
 613                         session->time, session->hostname);
 614                 break;
 615         case ACTION_USER:
 616                 fprintf(log_file, "%s: host=%s retrieving %s's timeline\n",
 617                         session->time, session->hostname, session->user);
 618                 break;
 619         case ACTION_REPLIES:
 620                 fprintf(log_file, "%s: host=%s retrieving replies\n",
 621                         session->time, session->hostname);
 622                 break;
 623         case ACTION_PUBLIC:
 624                 fprintf(log_file, "%s: host=%s retrieving public timeline\n",
 625                         session->time, session->hostname);
 626                 break;
 627         case ACTION_GROUP:
 628                 fprintf(log_file, "%s: host=%s retrieving group timeline\n",
 629                         session->time, session->hostname);
 630                 break;
 631         default:
 632                 break;
 633         }
 634
 635         fclose(log_file);
 636 }
 637
 638 static char *get_string_from_stdin(void)
 639 {
 640         char *temp;
 641         char *string;
 642
 643         string = zalloc(1000);
 644         if (!string)
 645                 return NULL;
 646
 647         if (!fgets(string, 999, stdin))
 648                 return NULL;
 649         temp = strchr(string, '\n');
 650         *temp = '\0';
 651         return string;
 652 }
 653
 654 static void read_password(char *buf, size_t len, char *host)
 655 {
 656         char pwd[80];
 657         int retval;
 658         struct termios old;
 659         struct termios tp;
 660
 661         tcgetattr(0, &tp);
 662         old = tp;
 663
 664         tp.c_lflag &= (~ECHO);
 665         tcsetattr(0, TCSANOW, &tp);
 666
 667         fprintf(stdout, "Enter password for %s: ", host);
 668         fflush(stdout);
 669         tcflow(0, TCOOFF);
 670         retval = scanf("%79s", pwd);
 671         tcflow(0, TCOON);
 672         fprintf(stdout, "\n");
 673
 674         tcsetattr(0, TCSANOW, &old);
 675
 676         strncpy(buf, pwd, len);
 677         buf[len-1] = '\0';
 678 }
 679
 680 static int find_urls(const char *tweet, int **pranges)
 681 {
 682         /*
 683          * magic obtained from
 684          * http://www.geekpedia.com/KB65_How-to-validate-an-URL-using-RegEx-in-Csharp.html
 685          */
 686         static const char *re_magic =
 687                 "(([a-zA-Z][0-9a-zA-Z+\\-\\.]*:)/{1,3}"
 688                 "[0-9a-zA-Z;/~?:@&=+$\\.\\-_'()%]+)"
 689                 "(#[0-9a-zA-Z;/?:@&=+$\\.\\-_!~*'()%]+)?";
 690         pcre *re;
 691         const char *errptr;
 692         int erroffset;
 693         int ovector[10] = {0,};
 694         const size_t ovsize = sizeof(ovector)/sizeof(*ovector);
 695         int startoffset, tweetlen;
 696         int i, rc;
 697         int rbound = 10;
 698         int rcount = 0;
 699         int *ranges = malloc(sizeof(int) * rbound);
 700
 701         re = pcre_compile(re_magic,
 702                         PCRE_NO_AUTO_CAPTURE,
 703                         &errptr, &erroffset, NULL);
 704         if (!re) {
 705                 fprintf(stderr, "pcre_compile @%u: %s\n", erroffset, errptr);
 706                 exit(1);
 707         }
 708
 709         tweetlen = strlen(tweet);
 710         for (startoffset = 0; startoffset < tweetlen; ) {
 711
 712                 rc = pcre_exec(re, NULL, tweet, strlen(tweet), startoffset, 0,
 713                                 ovector, ovsize);
 714                 if (rc == PCRE_ERROR_NOMATCH)
 715                         break;
 716
 717                 if (rc < 0) {
 718                         fprintf(stderr, "pcre_exec @%u: %s\n",
 719                                 erroffset, errptr);
 720                         exit(1);
 721                 }
 722
 723                 for (i = 0; i < rc; i += 2) {
 724                         if ((rcount+2) == rbound) {
 725                                 rbound *= 2;
 726                                 ranges = realloc(ranges, sizeof(int) * rbound);
 727                         }
 728
 729                         ranges[rcount++] = ovector[i];
 730                         ranges[rcount++] = ovector[i+1];
 731                 }
 732
 733                 startoffset = ovector[1];
 734         }
 735
 736         pcre_free(re);
 737
 738         *pranges = ranges;
 739         return rcount;
 740 }
 741
 742 /**
 743  * bidirectional popen() call
 744  *
 745  * @param rwepipe - int array of size three
 746  * @param exe - program to run
 747  * @param argv - argument list
 748  * @return pid or -1 on error
 749  *
 750  * The caller passes in an array of three integers (rwepipe), on successful
 751  * execution it can then write to element 0 (stdin of exe), and read from
 752  * element 1 (stdout) and 2 (stderr).
 753  */
 754 static int popenRWE(int *rwepipe, const char *exe, const char *const argv[])
 755 {
 756         int in[2];
 757         int out[2];
 758         int err[2];
 759         int pid;
 760         int rc;
 761
 762         rc = pipe(in);
 763         if (rc < 0)
 764                 goto error_in;
 765
 766         rc = pipe(out);
 767         if (rc < 0)
 768                 goto error_out;
 769
 770         rc = pipe(err);
 771         if (rc < 0)
 772                 goto error_err;
 773
 774         pid = fork();
 775         if (pid > 0) {
 776                 /* parent */
 777                 close(in[0]);
 778                 close(out[1]);
 779                 close(err[1]);
 780                 rwepipe[0] = in[1];
 781                 rwepipe[1] = out[0];
 782                 rwepipe[2] = err[0];
 783                 return pid;
 784         } else if (pid == 0) {
 785                 /* child */
 786                 close(in[1]);
 787                 close(out[0]);
 788                 close(err[0]);
 789                 close(0);
 790                 rc = dup(in[0]);
 791                 close(1);
 792                 rc = dup(out[1]);
 793                 close(2);
 794                 rc = dup(err[1]);
 795
 796                 execvp(exe, (char **)argv);
 797                 exit(1);
 798         } else
 799                 goto error_fork;
 800
 801         return pid;
 802
 803 error_fork:
 804         close(err[0]);
 805         close(err[1]);
 806 error_err:
 807         close(out[0]);
 808         close(out[1]);
 809 error_out:
 810         close(in[0]);
 811         close(in[1]);
 812 error_in:
 813         return -1;
 814 }
 815
 816 static int pcloseRWE(int pid, int *rwepipe)
 817 {
 818         int rc, status;
 819         close(rwepipe[0]);
 820         close(rwepipe[1]);
 821         close(rwepipe[2]);
 822         rc = waitpid(pid, &status, 0);
 823         return status;
 824 }
 825
 826 static char *shrink_one_url(int *rwepipe, char *big)
 827 {
 828         int biglen = strlen(big);
 829         char *small;
 830         int smalllen;
 831         int rc;
 832
 833         rc = dprintf(rwepipe[0], "%s\n", big);
 834         if (rc < 0)
 835                 return big;
 836
 837         smalllen = biglen + 128;
 838         small = malloc(smalllen);
 839         if (!small)
 840                 return big;
 841
 842         rc = read(rwepipe[1], small, smalllen);
 843         if (rc < 0 || rc > biglen)
 844                 goto error_free_small;
 845
 846         if (strncmp(small, "http://", 7))
 847                 goto error_free_small;
 848
 849         smalllen = rc;
 850         while (smalllen && isspace(small[smalllen-1]))
 851                         small[--smalllen] = 0;
 852
 853         free(big);
 854         return small;
 855
 856 error_free_small:
 857         free(small);
 858         return big;
 859 }
 860
 861 static char *shrink_urls(char *text)
 862 {
 863         int *ranges;
 864         int rcount;
 865         int i;
 866         int inofs = 0;
 867         int outofs = 0;
 868         const char *const shrink_args[] = {
 869                 "bti-shrink-urls",
 870                 NULL
 871         };
 872         int shrink_pid;
 873         int shrink_pipe[3];
 874         int inlen = strlen(text);
 875
 876         dbg("before len=%u\n", inlen);
 877
 878         shrink_pid = popenRWE(shrink_pipe, shrink_args[0], shrink_args);
 879         if (shrink_pid < 0)
 880                 return text;
 881
 882         rcount = find_urls(text, &ranges);
 883         if (!rcount)
 884                 return text;
 885
 886         for (i = 0; i < rcount; i += 2) {
 887                 int url_start = ranges[i];
 888                 int url_end = ranges[i+1];
 889                 int long_url_len = url_end - url_start;
 890                 char *url = strndup(text + url_start, long_url_len);
 891                 int short_url_len;
 892                 int not_url_len = url_start - inofs;
 893
 894                 dbg("long  url[%u]: %s\n", long_url_len, url);
 895                 url = shrink_one_url(shrink_pipe, url);
 896                 short_url_len = url ? strlen(url) : 0;
 897                 dbg("short url[%u]: %s\n", short_url_len, url);
 898
 899                 if (!url || short_url_len >= long_url_len) {
 900                         /* The short url ended up being too long
 901                          * or unavailable */
 902                         if (inofs) {
 903                                 strncpy(text + outofs, text + inofs,
 904                                                 not_url_len + long_url_len);
 905                         }
 906                         inofs += not_url_len + long_url_len;
 907                         outofs += not_url_len + long_url_len;
 908
 909                 } else {
 910                         /* copy the unmodified block */
 911                         strncpy(text + outofs, text + inofs, not_url_len);
 912                         inofs += not_url_len;
 913                         outofs += not_url_len;
 914
 915                         /* copy the new url */
 916                         strncpy(text + outofs, url, short_url_len);
 917                         inofs += long_url_len;
 918                         outofs += short_url_len;
 919                 }
 920
 921                 free(url);
 922         }
 923
 924         /* copy the last block after the last match */
 925         if (inofs) {
 926                 int tail = inlen - inofs;
 927                 if (tail) {
 928                         strncpy(text + outofs, text + inofs, tail);
 929                         outofs += tail;
 930                 }
 931         }
 932
 933         free(ranges);
 934
 935         (void)pcloseRWE(shrink_pid, shrink_pipe);
 936
 937         text[outofs] = 0;
 938         dbg("after len=%u\n", outofs);
 939         return text;
 940 }
 941
 942 int main(int argc, char *argv[], char *envp[])
 943 {
 944         static const struct option options[] = {
 945                 { "debug", 0, NULL, 'd' },
 946                 { "verbose", 0, NULL, 'V' },
 947                 { "account", 1, NULL, 'a' },
 948                 { "password", 1, NULL, 'p' },
 949                 { "host", 1, NULL, 'H' },
 950                 { "proxy", 1, NULL, 'P' },
 951                 { "action", 1, NULL, 'A' },
 952                 { "user", 1, NULL, 'u' },
 953                 { "group", 1, NULL, 'G' },
 954                 { "logfile", 1, NULL, 'L' },
 955                 { "shrink-urls", 0, NULL, 's' },
 956                 { "help", 0, NULL, 'h' },
 957                 { "bash", 0, NULL, 'b' },
 958                 { "dry-run", 0, NULL, 'n' },
 959                 { "page", 1, NULL, 'g' },
 960                 { "version", 0, NULL, 'v' },
 961                 { }
 962         };
 963         struct session *session;
 964         pid_t child;
 965         char *tweet;
 966         static char password[80];
 967         int retval = 0;
 968         int option;
 969         char *http_proxy;
 970         time_t t;
 971         int page_nr;
 972
 973         debug = 0;
 974         verbose = 0;
 975         rl_bind_key('\t', rl_insert);
 976
 977         session = session_alloc();
 978         if (!session) {
 979                 fprintf(stderr, "no more memory...\n");
 980                 return -1;
 981         }
 982
 983         /* get the current time so that we can log it later */
 984         time(&t);
 985         session->time = strdup(ctime(&t));
 986         session->time[strlen(session->time)-1] = 0x00;
 987
 988         session->homedir = strdup(getenv("HOME"));
 989
 990         curl_global_init(CURL_GLOBAL_ALL);
 991
 992         /* Set environment variables first, before reading command line options
 993          * or config file values. */
 994         http_proxy = getenv("http_proxy");
 995         if (http_proxy) {
 996                 if (session->proxy)
 997                         free(session->proxy);
 998                 session->proxy = strdup(http_proxy);
 999                 dbg("http_proxy = %s\n", session->proxy);
1000         }
1001
1002         parse_configfile(session);
1003
1004         while (1) {
1005                 option = getopt_long_only(argc, argv, "dp:P:H:a:A:u:hg:G:snVv",
1006                                           options, NULL);
1007                 if (option == -1)
1008                         break;
1009                 switch (option) {
1010                 case 'd':
1011                         debug = 1;
1012                         break;
1013                 case 'V':
1014                         verbose = 1;
1015                         break;
1016                 case 'a':
1017                         if (session->account)
1018                                 free(session->account);
1019                         session->account = strdup(optarg);
1020                         dbg("account = %s\n", session->account);
1021                         break;
1022                 case 'g':
1023                         page_nr = atoi(optarg);
1024                         dbg("page = %d\n", page_nr);
1025                         session->page = page_nr;
1026                         break;
1027                 case 'p':
1028                         if (session->password)
1029                                 free(session->password);
1030                         session->password = strdup(optarg);
1031                         dbg("password = %s\n", session->password);
1032                         break;
1033                 case 'P':
1034                         if (session->proxy)
1035                                 free(session->proxy);
1036                         session->proxy = strdup(optarg);
1037                         dbg("proxy = %s\n", session->proxy);
1038                         break;
1039                 case 'A':
1040                         if (strcasecmp(optarg, "update") == 0)
1041                                 session->action = ACTION_UPDATE;
1042                         else if (strcasecmp(optarg, "friends") == 0)
1043                                 session->action = ACTION_FRIENDS;
1044                         else if (strcasecmp(optarg, "user") == 0)
1045                                 session->action = ACTION_USER;
1046                         else if (strcasecmp(optarg, "replies") == 0)
1047                                 session->action = ACTION_REPLIES;
1048                         else if (strcasecmp(optarg, "public") == 0)
1049                                 session->action = ACTION_PUBLIC;
1050                         else if (strcasecmp(optarg, "group") == 0)
1051                                 session->action = ACTION_GROUP;
1052                         else
1053                                 session->action = ACTION_UNKNOWN;
1054                         dbg("action = %d\n", session->action);
1055                         break;
1056                 case 'u':
1057                         if (session->user)
1058                                 free(session->user);
1059                         session->user = strdup(optarg);
1060                         dbg("user = %s\n", session->user);
1061                         break;
1062
1063                 case 'G':
1064                         if (session->group)
1065                                 free(session->group);
1066                         session->group = strdup(optarg);
1067                         dbg("group = %s\n", session->group);
1068                         break;
1069                 case 'L':
1070                         if (session->logfile)
1071                                 free(session->logfile);
1072                         session->logfile = strdup(optarg);
1073                         dbg("logfile = %s\n", session->logfile);
1074                         break;
1075                 case 's':
1076                         session->shrink_urls = 1;
1077                         break;
1078                 case 'H':
1079                         if (session->hosturl)
1080                                 free(session->hosturl);
1081                         if (session->hostname)
1082                                 free(session->hostname);
1083                         if (strcasecmp(optarg, "twitter") == 0) {
1084                                 session->host = HOST_TWITTER;
1085                                 session->hosturl = strdup(twitter_host);
1086                                 session->hostname = strdup(twitter_name);
1087                         } else if (strcasecmp(optarg, "identica") == 0) {
1088                                 session->host = HOST_IDENTICA;
1089                                 session->hosturl = strdup(identica_host);
1090                                 session->hostname = strdup(identica_name);
1091                         } else {
1092                                 session->host = HOST_CUSTOM;
1093                                 session->hosturl = strdup(optarg);
1094                                 session->hostname = strdup(optarg);
1095                         }
1096                         dbg("host = %d\n", session->host);
1097                         break;
1098                 case 'b':
1099                         session->bash = 1;
1100                         break;
1101                 case 'h':
1102                         display_help();
1103                         goto exit;
1104                 case 'n':
1105                         session->dry_run = 1;
1106                         break;
1107                 case 'v':
1108                         display_version();
1109                         goto exit;
1110                 default:
1111                         display_help();
1112                         goto exit;
1113                 }
1114         }
1115
1116         /*
1117          * Show the version to make it easier to determine what
1118          * is going on here
1119          */
1120         if (debug)
1121                 display_version();
1122
1123         if (session->action == ACTION_UNKNOWN) {
1124                 fprintf(stderr, "Unknown action, valid actions are:\n");
1125                 fprintf(stderr, "'update', 'friends', 'public', "
1126                         "'replies', 'group' or 'user'.\n");
1127                 goto exit;
1128         }
1129
1130         if (!session->host) {
1131                 fprintf(stderr, "You need to provide a host either in ~/.bti or with --host.\n");
1132                 goto exit;
1133         }
1134
1135         if (session->host == HOST_TWITTER && session->action == ACTION_GROUP) {
1136                 fprintf(stderr, "Groups only work in Identi.ca.\n");
1137                 goto exit;
1138         }
1139
1140         if (session->action == ACTION_GROUP && !session->group) {
1141                 fprintf(stdout, "Enter group name: ");
1142                 session->group = readline(NULL);
1143         }
1144
1145         if (!session->account) {
1146                 fprintf(stdout, "Enter account for %s: ", session->hostname);
1147                 session->account = readline(NULL);
1148         }
1149
1150         if (!session->password) {
1151                 read_password(password, sizeof(password), session->hostname);
1152                 session->password = strdup(password);
1153         }
1154
1155         if (session->action == ACTION_UPDATE) {
1156                 if (session->bash)
1157                         tweet = get_string_from_stdin();
1158                 else
1159                         tweet = readline("tweet: ");
1160                 if (!tweet || strlen(tweet) == 0) {
1161                         dbg("no tweet?\n");
1162                         return -1;
1163                 }
1164
1165                 if (session->shrink_urls)
1166                         tweet = shrink_urls(tweet);
1167
1168                 session->tweet = zalloc(strlen(tweet) + 10);
1169                 if (session->bash)
1170                         sprintf(session->tweet, "%c %s",
1171                                 getuid() ? '$' : '#', tweet);
1172                 else
1173                         sprintf(session->tweet, "%s", tweet);
1174
1175                 free(tweet);
1176                 dbg("tweet = %s\n", session->tweet);
1177         }
1178
1179         if (!session->user)
1180                 session->user = strdup(session->account);
1181
1182         if (session->page == 0)
1183                 session->page = 1;
1184         dbg("account = %s\n", session->account);
1185         dbg("password = %s\n", session->password);
1186         dbg("host = %d\n", session->host);
1187         dbg("action = %d\n", session->action);
1188
1189         /* fork ourself so that the main shell can get on
1190          * with it's life as we try to connect and handle everything
1191          */
1192         if (session->bash) {
1193                 child = fork();
1194                 if (child) {
1195                         dbg("child is %d\n", child);
1196                         exit(0);
1197                 }
1198         }
1199
1200         retval = send_request(session);
1201         if (retval && !session->bash)
1202                 fprintf(stderr, "operation failed\n");
1203
1204         log_session(session, retval);
1205 exit:
1206         session_free(session);
1207         return retval;;
1208 }