bti.c

   1 /*
   2  * Copyright (C) 2008 Greg Kroah-Hartman <greg@kroah.com>
   3  * Copyright (C) 2009 Bart Trojanowski <bart@jukie.net>
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License as published by the
   7  * Free Software Foundation version 2 of the License.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along
  15  * with this program; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  17  */
  18
  19 #define _GNU_SOURCE
  20
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23 #include <stddef.h>
  24 #include <string.h>
  25 #include <getopt.h>
  26 #include <errno.h>
  27 #include <ctype.h>
  28 #include <fcntl.h>
  29 #include <unistd.h>
  30 #include <time.h>
  31 #include <sys/stat.h>
  32 #include <sys/types.h>
  33 #include <sys/wait.h>
  34 #include <curl/curl.h>
  35 #include <readline/readline.h>
  36 #include <libxml/xmlmemory.h>
  37 #include <libxml/parser.h>
  38 #include <libxml/tree.h>
  39 #include <pcre.h>
  40
  41
  42 #define zalloc(size)    calloc(size, 1)
  43
  44 #define dbg(format, arg...)                                             \
  45         do {                                                            \
  46                 if (debug)                                              \
  47                         fprintf(stdout, "bti: %s: " format , __func__ , \
  48                                 ## arg);                                \
  49         } while (0)
  50
  51
  52 static int debug;
  53
  54 enum host {
  55         HOST_TWITTER = 0,
  56         HOST_IDENTICA = 1,
  57 };
  58
  59 enum action {
  60         ACTION_UPDATE = 0,
  61         ACTION_FRIENDS = 1,
  62         ACTION_USER = 2,
  63         ACTION_REPLIES = 4,
  64         ACTION_PUBLIC = 8,
  65         ACTION_UNKNOWN = 16
  66 };
  67
  68 struct session {
  69         char *password;
  70         char *account;
  71         char *tweet;
  72         char *proxy;
  73         char *time;
  74         char *homedir;
  75         char *logfile;
  76         char *user;
  77         int bash;
  78         int shrink_urls;
  79         int dry_run;
  80         int page;
  81         enum host host;
  82         enum action action;
  83 };
  84
  85 struct bti_curl_buffer {
  86         char *data;
  87         enum action action;
  88         int length;
  89 };
  90
  91 static void display_help(void)
  92 {
  93         fprintf(stdout, "bti - send tweet to twitter or identi.ca\n");
  94         fprintf(stdout, "Version: " VERSION "\n");
  95         fprintf(stdout, "Usage:\n");
  96         fprintf(stdout, "  bti [options]\n");
  97         fprintf(stdout, "options are:\n");
  98         fprintf(stdout, "  --account accountname\n");
  99         fprintf(stdout, "  --password password\n");
 100         fprintf(stdout, "  --action action\n");
 101         fprintf(stdout, "    ('update', 'friends', 'public', 'replies' "
 102                 "or 'user')\n");
 103         fprintf(stdout, "  --user screenname\n");
 104         fprintf(stdout, "  --proxy PROXY:PORT\n");
 105         fprintf(stdout, "  --host HOST\n");
 106         fprintf(stdout, "  --logfile logfile\n");
 107         fprintf(stdout, "  --shrink-urls\n");
 108         fprintf(stdout, "  --page PAGENUMBER\n");
 109         fprintf(stdout, "  --bash\n");
 110         fprintf(stdout, "  --debug\n");
 111         fprintf(stdout, "  --dry-run\n");
 112         fprintf(stdout, "  --version\n");
 113         fprintf(stdout, "  --help\n");
 114 }
 115
 116 static void display_version(void)
 117 {
 118         fprintf(stdout, "bti - version %s\n", VERSION);
 119 }
 120
 121 static struct session *session_alloc(void)
 122 {
 123         struct session *session;
 124
 125         session = zalloc(sizeof(*session));
 126         if (!session)
 127                 return NULL;
 128         return session;
 129 }
 130
 131 static void session_free(struct session *session)
 132 {
 133         if (!session)
 134                 return;
 135         free(session->password);
 136         free(session->account);
 137         free(session->tweet);
 138         free(session->proxy);
 139         free(session->time);
 140         free(session->homedir);
 141         free(session->user);
 142         free(session);
 143 }
 144
 145 static struct bti_curl_buffer *bti_curl_buffer_alloc(enum action action)
 146 {
 147         struct bti_curl_buffer *buffer;
 148
 149         buffer = zalloc(sizeof(*buffer));
 150         if (!buffer)
 151                 return NULL;
 152
 153         /* start out with a data buffer of 1 byte to
 154          * make the buffer fill logic simpler */
 155         buffer->data = zalloc(1);
 156         if (!buffer->data) {
 157                 free(buffer);
 158                 return NULL;
 159         }
 160         buffer->length = 0;
 161         buffer->action = action;
 162         return buffer;
 163 }
 164
 165 static void bti_curl_buffer_free(struct bti_curl_buffer *buffer)
 166 {
 167         if (!buffer)
 168                 return;
 169         free(buffer->data);
 170         free(buffer);
 171 }
 172
 173 static const char *twitter_user_url    = "http://twitter.com/statuses/user_timeline/";
 174 static const char *twitter_update_url  = "https://twitter.com/statuses/update.xml";
 175 static const char *twitter_public_url  = "http://twitter.com/statuses/public_timeline.xml";
 176 static const char *twitter_friends_url = "https://twitter.com/statuses/friends_timeline.xml";
 177 static const char *twitter_replies_url = "http://twitter.com/statuses/replies.xml";
 178
 179 static const char *identica_user_url    = "http://identi.ca/api/statuses/user_timeline/";
 180 static const char *identica_update_url  = "http://identi.ca/api/statuses/update.xml";
 181 static const char *identica_public_url  = "http://identi.ca/api/statuses/public_timeline.xml";
 182 static const char *identica_friends_url = "http://identi.ca/api/statuses/friends_timeline.xml";
 183 static const char *identica_replies_url = "http://identi.ca/api/statuses/replies.xml";
 184
 185 static CURL *curl_init(void)
 186 {
 187         CURL *curl;
 188
 189         curl = curl_easy_init();
 190         if (!curl) {
 191                 fprintf(stderr, "Can not init CURL!\n");
 192                 return NULL;
 193         }
 194         /* some ssl sanity checks on the connection we are making */
 195         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0);
 196         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0);
 197         return curl;
 198 }
 199
 200 static void parse_statuses(xmlDocPtr doc, xmlNodePtr current)
 201 {
 202         xmlChar *text = NULL;
 203         xmlChar *user = NULL;
 204         xmlChar *created = NULL;
 205         xmlNodePtr userinfo;
 206
 207         current = current->xmlChildrenNode;
 208         while (current != NULL) {
 209                 if (current->type == XML_ELEMENT_NODE) {
 210                         if (!xmlStrcmp(current->name, (const xmlChar *)"created_at"))
 211                                 created = xmlNodeListGetString(doc, current->xmlChildrenNode, 1);
 212                         if (!xmlStrcmp(current->name, (const xmlChar *)"text"))
 213                                 text = xmlNodeListGetString(doc, current->xmlChildrenNode, 1);
 214                         if (!xmlStrcmp(current->name, (const xmlChar *)"user")) {
 215                                 userinfo = current->xmlChildrenNode;
 216                                 while (userinfo != NULL) {
 217                                         if ((!xmlStrcmp(userinfo->name, (const xmlChar *)"screen_name"))) {
 218                                                 if (user)
 219                                                         xmlFree(user);
 220                                                 user = xmlNodeListGetString(doc, userinfo->xmlChildrenNode, 1);
 221                                         }
 222                                         userinfo = userinfo->next;
 223                                 }
 224                         }
 225
 226                         if (user && text && created) {
 227                                 printf("[%s] (%.16s) %s\n",
 228                                         user, created, text);
 229                                 xmlFree(user);
 230                                 xmlFree(text);
 231                                 xmlFree(created);
 232                                 user = NULL;
 233                                 text = NULL;
 234                                 created = NULL;
 235                         }
 236                 }
 237                 current = current->next;
 238         }
 239
 240         return;
 241 }
 242
 243 static void parse_timeline(char *document)
 244 {
 245         xmlDocPtr doc;
 246         xmlNodePtr current;
 247
 248         doc = xmlReadMemory(document, strlen(document), "timeline.xml",
 249                             NULL, XML_PARSE_NOERROR);
 250         if (doc == NULL)
 251                 return;
 252
 253         current = xmlDocGetRootElement(doc);
 254         if (current == NULL) {
 255                 fprintf(stderr, "empty document\n");
 256                 xmlFreeDoc(doc);
 257                 return;
 258         }
 259
 260         if (xmlStrcmp(current->name, (const xmlChar *) "statuses")) {
 261                 fprintf(stderr, "unexpected document type\n");
 262                 xmlFreeDoc(doc);
 263                 return;
 264         }
 265
 266         current = current->xmlChildrenNode;
 267         while (current != NULL) {
 268                 if ((!xmlStrcmp(current->name, (const xmlChar *)"status")))
 269                         parse_statuses(doc, current);
 270                 current = current->next;
 271         }
 272         xmlFreeDoc(doc);
 273
 274         return;
 275 }
 276
 277 static size_t curl_callback(void *buffer, size_t size, size_t nmemb,
 278                             void *userp)
 279 {
 280         struct bti_curl_buffer *curl_buf = userp;
 281         size_t buffer_size = size * nmemb;
 282         char *temp;
 283
 284         if ((!buffer) || (!buffer_size) || (!curl_buf))
 285                 return -EINVAL;
 286
 287         /* add to the data we already have */
 288         temp = zalloc(curl_buf->length + buffer_size + 1);
 289         if (!temp)
 290                 return -ENOMEM;
 291
 292         memcpy(temp, curl_buf->data, curl_buf->length);
 293         free(curl_buf->data);
 294         curl_buf->data = temp;
 295         memcpy(&curl_buf->data[curl_buf->length], (char *)buffer, buffer_size);
 296         curl_buf->length += buffer_size;
 297         if (curl_buf->action)
 298                 parse_timeline(curl_buf->data);
 299
 300         dbg("%s\n", curl_buf->data);
 301
 302         return buffer_size;
 303 }
 304
 305 static int send_request(struct session *session)
 306 {
 307         char user_password[500];
 308         char data[500];
 309         /* is there usernames longer than 22 chars? */
 310         char user_url[70];
 311         struct bti_curl_buffer *curl_buf;
 312         CURL *curl = NULL;
 313         CURLcode res;
 314         struct curl_httppost *formpost = NULL;
 315         struct curl_httppost *lastptr = NULL;
 316         struct curl_slist *slist = NULL;
 317
 318         if (!session)
 319                 return -EINVAL;
 320
 321         curl_buf = bti_curl_buffer_alloc(session->action);
 322         if (!curl_buf)
 323                 return -ENOMEM;
 324
 325         curl = curl_init();
 326         if (!curl)
 327                 return -EINVAL;
 328
 329         switch (session->action) {
 330         case ACTION_UPDATE:
 331                 snprintf(user_password, sizeof(user_password), "%s:%s",
 332                          session->account, session->password);
 333                 snprintf(data, sizeof(data), "status=\"%s\"", session->tweet);
 334                 curl_formadd(&formpost, &lastptr,
 335                              CURLFORM_COPYNAME, "status",
 336                              CURLFORM_COPYCONTENTS, session->tweet,
 337                              CURLFORM_END);
 338
 339                 curl_formadd(&formpost, &lastptr,
 340                              CURLFORM_COPYNAME, "source",
 341                              CURLFORM_COPYCONTENTS, "bti",
 342                              CURLFORM_END);
 343
 344                 curl_easy_setopt(curl, CURLOPT_HTTPPOST, formpost);
 345                 slist = curl_slist_append(slist, "Expect:");
 346                 curl_easy_setopt(curl, CURLOPT_HTTPHEADER, slist);
 347                 switch (session->host) {
 348                 case HOST_TWITTER:
 349                         curl_easy_setopt(curl, CURLOPT_URL,
 350                                          twitter_update_url);
 351                         break;
 352                 case HOST_IDENTICA:
 353                         curl_easy_setopt(curl, CURLOPT_URL,
 354                                          identica_update_url);
 355                         break;
 356                 }
 357                 curl_easy_setopt(curl, CURLOPT_USERPWD, user_password);
 358
 359                 break;
 360         case ACTION_FRIENDS:
 361                 snprintf(user_password, sizeof(user_password), "%s:%s",
 362                          session->account, session->password);
 363                 switch (session->host) {
 364                 case HOST_TWITTER:
 365                         sprintf(user_url, "%s?page=%d", twitter_friends_url, session->page);
 366                         curl_easy_setopt(curl, CURLOPT_URL, user_url);
 367                         break;
 368                 case HOST_IDENTICA:
 369                         sprintf(user_url, "%s?page=%d", identica_friends_url, session->page);
 370                         curl_easy_setopt(curl, CURLOPT_URL, user_url);
 371                         break;
 372                 }
 373                 curl_easy_setopt(curl, CURLOPT_USERPWD, user_password);
 374
 375                 break;
 376         case ACTION_USER:
 377                 switch (session->host) {
 378                 case HOST_TWITTER:
 379                         sprintf(user_url, "%s%s.xml?page=%d", twitter_user_url, session->user, session->page);
 380                         curl_easy_setopt(curl, CURLOPT_URL, user_url);
 381                         break;
 382                 case HOST_IDENTICA:
 383                         sprintf(user_url, "%s%s.xml?page=%d", identica_user_url, session->user, session->page);
 384                         curl_easy_setopt(curl, CURLOPT_URL, user_url);
 385                         break;
 386                 }
 387
 388                 break;
 389         case ACTION_REPLIES:
 390                 snprintf(user_password, sizeof(user_password), "%s:%s",
 391                          session->account, session->password);
 392                 switch (session->host) {
 393                 case HOST_TWITTER:
 394                         sprintf(user_url, "%s?page=%d", twitter_replies_url, session->page);
 395                         curl_easy_setopt(curl, CURLOPT_URL, user_url);
 396                         break;
 397                 case HOST_IDENTICA:
 398                         sprintf(user_url, "%s?page=%d", identica_replies_url, session->page);
 399                         curl_easy_setopt(curl, CURLOPT_URL, user_url);
 400                         break;
 401                 }
 402                 curl_easy_setopt(curl, CURLOPT_USERPWD, user_password);
 403
 404                 break;
 405         case ACTION_PUBLIC:
 406                 switch (session->host) {
 407                 case HOST_TWITTER:
 408                         sprintf(user_url, "%s?page=%d", twitter_public_url, session->page);
 409                         curl_easy_setopt(curl, CURLOPT_URL, user_url);
 410                         break;
 411                 case HOST_IDENTICA:
 412                         sprintf(user_url, "%s?page=%d", identica_public_url, session->page);
 413                         curl_easy_setopt(curl, CURLOPT_URL, user_url);
 414                         break;
 415                 }
 416
 417                 break;
 418         default:
 419                 break;
 420         }
 421
 422         if (session->proxy)
 423                 curl_easy_setopt(curl, CURLOPT_PROXY, session->proxy);
 424
 425         if (debug)
 426                 curl_easy_setopt(curl, CURLOPT_VERBOSE, 1);
 427
 428         dbg("user_password = %s\n", user_password);
 429         dbg("data = %s\n", data);
 430         dbg("proxy = %s\n", session->proxy);
 431
 432         curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, curl_callback);
 433         curl_easy_setopt(curl, CURLOPT_WRITEDATA, curl_buf);
 434         if (!session->dry_run) {
 435                 res = curl_easy_perform(curl);
 436                 if (res && !session->bash) {
 437                         fprintf(stderr, "error(%d) trying to perform "
 438                                 "operation\n", res);
 439                         return -EINVAL;
 440                 }
 441         }
 442
 443         curl_easy_cleanup(curl);
 444         if (session->action == ACTION_UPDATE)
 445                 curl_formfree(formpost);
 446         bti_curl_buffer_free(curl_buf);
 447         return 0;
 448 }
 449
 450 static void parse_configfile(struct session *session)
 451 {
 452         FILE *config_file;
 453         char *line = NULL;
 454         size_t len = 0;
 455         char *account = NULL;
 456         char *password = NULL;
 457         char *host = NULL;
 458         char *proxy = NULL;
 459         char *logfile = NULL;
 460         char *action = NULL;
 461         char *user = NULL;
 462         char *file;
 463         int shrink_urls = 0;
 464
 465         /* config file is ~/.bti  */
 466         file = alloca(strlen(session->homedir) + 7);
 467
 468         sprintf(file, "%s/.bti", session->homedir);
 469
 470         config_file = fopen(file, "r");
 471
 472         /* No error if file does not exist or is unreadable.  */
 473         if (config_file == NULL)
 474                 return;
 475
 476         do {
 477                 ssize_t n = getline(&line, &len, config_file);
 478                 if (n < 0)
 479                         break;
 480                 if (line[n - 1] == '\n')
 481                         line[n - 1] = '\0';
 482                 /* Parse file.  Format is the usual value pairs:
 483                    account=name
 484                    passwort=value
 485                    # is a comment character
 486                 */
 487                 *strchrnul(line, '#') = '\0';
 488                 char *c = line;
 489                 while (isspace(*c))
 490                         c++;
 491                 /* Ignore blank lines.  */
 492                 if (c[0] == '\0')
 493                         continue;
 494
 495                 if (!strncasecmp(c, "account", 7) && (c[7] == '=')) {
 496                         c += 8;
 497                         if (c[0] != '\0')
 498                                 account = strdup(c);
 499                 } else if (!strncasecmp(c, "password", 8) &&
 500                            (c[8] == '=')) {
 501                         c += 9;
 502                         if (c[0] != '\0')
 503                                 password = strdup(c);
 504                 } else if (!strncasecmp(c, "host", 4) &&
 505                            (c[4] == '=')) {
 506                         c += 5;
 507                         if (c[0] != '\0')
 508                                 host = strdup(c);
 509                 } else if (!strncasecmp(c, "proxy", 5) &&
 510                            (c[5] == '=')) {
 511                         c += 6;
 512                         if (c[0] != '\0')
 513                                 proxy = strdup(c);
 514                 } else if (!strncasecmp(c, "logfile", 7) &&
 515                            (c[7] == '=')) {
 516                         c += 8;
 517                         if (c[0] != '\0')
 518                                 logfile = strdup(c);
 519                 } else if (!strncasecmp(c, "action", 6) &&
 520                            (c[6] == '=')) {
 521                         c += 7;
 522                         if (c[0] != '\0')
 523                                 action = strdup(c);
 524                 } else if (!strncasecmp(c, "user", 4) &&
 525                                 (c[4] == '=')) {
 526                         c += 5;
 527                         if (c[0] != '\0')
 528                                 user = strdup(c);
 529                 } else if (!strncasecmp(c, "shrink-urls", 11) &&
 530                                 (c[11] == '=')) {
 531                         c += 12;
 532                         if (!strncasecmp(c, "true", 4) ||
 533                                         !strncasecmp(c, "yes", 3))
 534                                 shrink_urls = 1;
 535                 }
 536         } while (!feof(config_file));
 537
 538         if (password)
 539                 session->password = password;
 540         if (account)
 541                 session->account = account;
 542         if (host) {
 543                 if (strcasecmp(host, "twitter") == 0)
 544                         session->host = HOST_TWITTER;
 545                 if (strcasecmp(host, "identica") == 0)
 546                         session->host = HOST_IDENTICA;
 547                 free(host);
 548         }
 549         if (proxy) {
 550                 if (session->proxy)
 551                         free(session->proxy);
 552                 session->proxy = proxy;
 553         }
 554         if (logfile)
 555                 session->logfile = logfile;
 556         if (action) {
 557                 if (strcasecmp(action, "update") == 0)
 558                         session->action = ACTION_UPDATE;
 559                 else if (strcasecmp(action, "friends") == 0)
 560                         session->action = ACTION_FRIENDS;
 561                 else if (strcasecmp(action, "user") == 0)
 562                         session->action = ACTION_USER;
 563                 else if (strcasecmp(action, "replies") == 0)
 564                         session->action = ACTION_REPLIES;
 565                 else if (strcasecmp(action, "public") == 0)
 566                         session->action = ACTION_PUBLIC;
 567                 else
 568                         session->action = ACTION_UNKNOWN;
 569                 free(action);
 570         }
 571         if (user)
 572                 session->user = user;
 573         session->shrink_urls = shrink_urls;
 574
 575         /* Free buffer and close file.  */
 576         free(line);
 577         fclose(config_file);
 578 }
 579
 580 static void log_session(struct session *session, int retval)
 581 {
 582         FILE *log_file;
 583         char *filename;
 584         char *host;
 585
 586         /* Only log something if we have a log file set */
 587         if (!session->logfile)
 588                 return;
 589
 590         filename = alloca(strlen(session->homedir) +
 591                           strlen(session->logfile) + 3);
 592
 593         sprintf(filename, "%s/%s", session->homedir, session->logfile);
 594
 595         log_file = fopen(filename, "a+");
 596         if (log_file == NULL)
 597                 return;
 598         switch (session->host) {
 599         case HOST_TWITTER:
 600                 host = "twitter";
 601                 break;
 602         case HOST_IDENTICA:
 603                 host = "identi.ca";
 604                 break;
 605         default:
 606                 host = "unknown";
 607                 break;
 608         }
 609
 610         switch (session->action) {
 611         case ACTION_UPDATE:
 612                 if (retval)
 613                         fprintf(log_file, "%s: host=%s tweet failed\n",
 614                                 session->time, host);
 615                 else
 616                         fprintf(log_file, "%s: host=%s tweet=%s\n",
 617                                 session->time, host, session->tweet);
 618                 break;
 619         case ACTION_FRIENDS:
 620                 fprintf(log_file, "%s: host=%s retrieving friends timeline\n",
 621                         session->time, host);
 622                 break;
 623         case ACTION_USER:
 624                 fprintf(log_file, "%s: host=%s retrieving %s's timeline\n",
 625                         session->time, host, session->user);
 626                 break;
 627         case ACTION_REPLIES:
 628                 fprintf(log_file, "%s: host=%s retrieving replies\n",
 629                         session->time, host);
 630                 break;
 631         case ACTION_PUBLIC:
 632                 fprintf(log_file, "%s: host=%s retrieving public 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 static int find_urls(const char *tweet, int **pranges)
 659 {
 660         /*
 661          * magic obtained from
 662          * http://www.geekpedia.com/KB65_How-to-validate-an-URL-using-RegEx-in-Csharp.html
 663          */
 664         static const char *re_magic =
 665                 "(([a-zA-Z][0-9a-zA-Z+\\-\\.]*:)/{1,3}"
 666                 "[0-9a-zA-Z;/~?:@&=+$\\.\\-_'()%]+)"
 667                 "(#[0-9a-zA-Z;/?:@&=+$\\.\\-_!~*'()%]+)?";
 668         pcre *re;
 669         const char *errptr;
 670         int erroffset;
 671         int ovector[10] = {0,};
 672         const size_t ovsize = sizeof(ovector)/sizeof(*ovector);
 673         int startoffset, tweetlen;
 674         int i, rc;
 675         int rbound = 10;
 676         int rcount = 0;
 677         int *ranges = malloc(sizeof(int) * rbound);
 678
 679         re = pcre_compile(re_magic,
 680                         PCRE_NO_AUTO_CAPTURE,
 681                         &errptr, &erroffset, NULL);
 682         if (!re) {
 683                 fprintf(stderr, "pcre_compile @%u: %s\n", erroffset, errptr);
 684                 exit(1);
 685         }
 686
 687         tweetlen = strlen(tweet);
 688         for (startoffset = 0; startoffset < tweetlen; ) {
 689
 690                 rc = pcre_exec(re, NULL, tweet, strlen(tweet), startoffset, 0,
 691                                 ovector, ovsize);
 692                 if (rc == PCRE_ERROR_NOMATCH)
 693                         break;
 694
 695                 if (rc < 0) {
 696                         fprintf(stderr, "pcre_exec @%u: %s\n",
 697                                 erroffset, errptr);
 698                         exit(1);
 699                 }
 700
 701                 for (i = 0; i < rc; i += 2) {
 702                         if ((rcount+2) == rbound) {
 703                                 rbound *= 2;
 704                                 ranges = realloc(ranges, sizeof(int) * rbound);
 705                         }
 706
 707                         ranges[rcount++] = ovector[i];
 708                         ranges[rcount++] = ovector[i+1];
 709                 }
 710
 711                 startoffset = ovector[1];
 712         }
 713
 714         pcre_free(re);
 715
 716         *pranges = ranges;
 717         return rcount;
 718 }
 719
 720 /**
 721  * bidirectional popen() call
 722  *
 723  * @param rwepipe - int array of size three
 724  * @param exe - program to run
 725  * @param argv - argument list
 726  * @return pid or -1 on error
 727  *
 728  * The caller passes in an array of three integers (rwepipe), on successful
 729  * execution it can then write to element 0 (stdin of exe), and read from
 730  * element 1 (stdout) and 2 (stderr).
 731  */
 732 static int popenRWE(int *rwepipe, const char *exe, const char *const argv[])
 733 {
 734         int in[2];
 735         int out[2];
 736         int err[2];
 737         int pid;
 738         int rc;
 739
 740         rc = pipe(in);
 741         if (rc < 0)
 742                 goto error_in;
 743
 744         rc = pipe(out);
 745         if (rc < 0)
 746                 goto error_out;
 747
 748         rc = pipe(err);
 749         if (rc < 0)
 750                 goto error_err;
 751
 752         pid = fork();
 753         if (pid > 0) {
 754                 /* parent */
 755                 close(in[0]);
 756                 close(out[1]);
 757                 close(err[1]);
 758                 rwepipe[0] = in[1];
 759                 rwepipe[1] = out[0];
 760                 rwepipe[2] = err[0];
 761                 return pid;
 762         } else if (pid == 0) {
 763                 /* child */
 764                 close(in[1]);
 765                 close(out[0]);
 766                 close(err[0]);
 767                 close(0);
 768                 rc = dup(in[0]);
 769                 close(1);
 770                 rc = dup(out[1]);
 771                 close(2);
 772                 rc = dup(err[1]);
 773
 774                 execvp(exe, (char **)argv);
 775                 exit(1);
 776         } else
 777                 goto error_fork;
 778
 779         return pid;
 780
 781 error_fork:
 782         close(err[0]);
 783         close(err[1]);
 784 error_err:
 785         close(out[0]);
 786         close(out[1]);
 787 error_out:
 788         close(in[0]);
 789         close(in[1]);
 790 error_in:
 791         return -1;
 792 }
 793
 794 static int pcloseRWE(int pid, int *rwepipe)
 795 {
 796         int rc, status;
 797         close(rwepipe[0]);
 798         close(rwepipe[1]);
 799         close(rwepipe[2]);
 800         rc = waitpid(pid, &status, 0);
 801         return status;
 802 }
 803
 804 static char *shrink_one_url(int *rwepipe, char *big)
 805 {
 806         int biglen = strlen(big);
 807         char *small;
 808         int smalllen;
 809         int rc;
 810
 811         rc = dprintf(rwepipe[0], "%s\n", big);
 812         if (rc < 0)
 813                 return big;
 814
 815         smalllen = biglen + 128;
 816         small = malloc(smalllen);
 817         if (!small)
 818                 return big;
 819
 820         rc = read(rwepipe[1], small, smalllen);
 821         if (rc < 0 || rc > biglen)
 822                 goto error_free_small;
 823
 824         if (strncmp(small, "http://", 7))
 825                 goto error_free_small;
 826
 827         smalllen = rc;
 828         while (smalllen && isspace(small[smalllen-1]))
 829                         small[--smalllen] = 0;
 830
 831         free(big);
 832         return small;
 833
 834 error_free_small:
 835         free(small);
 836         return big;
 837 }
 838
 839 static char *shrink_urls(char *text)
 840 {
 841         int *ranges;
 842         int rcount;
 843         int i;
 844         int inofs = 0;
 845         int outofs = 0;
 846         const char *const shrink_args[] = {
 847                 "bti-shrink-urls",
 848                 NULL
 849         };
 850         int shrink_pid;
 851         int shrink_pipe[3];
 852         int inlen = strlen(text);
 853
 854         dbg("before len=%u\n", inlen);
 855
 856         shrink_pid = popenRWE(shrink_pipe, shrink_args[0], shrink_args);
 857         if (shrink_pid < 0)
 858                 return text;
 859
 860         rcount = find_urls(text, &ranges);
 861         if (!rcount)
 862                 return text;
 863
 864         for (i = 0; i < rcount; i += 2) {
 865                 int url_start = ranges[i];
 866                 int url_end = ranges[i+1];
 867                 int long_url_len = url_end - url_start;
 868                 char *url = strndup(text + url_start, long_url_len);
 869                 int short_url_len;
 870                 int not_url_len = url_start - inofs;
 871
 872                 dbg("long  url[%u]: %s\n", long_url_len, url);
 873                 url = shrink_one_url(shrink_pipe, url);
 874                 short_url_len = url ? strlen(url) : 0;
 875                 dbg("short url[%u]: %s\n", short_url_len, url);
 876
 877                 if (!url || short_url_len >= long_url_len) {
 878                         /* The short url ended up being too long
 879                          * or unavailable */
 880                         if (inofs) {
 881                                 strncpy(text + outofs, text + inofs,
 882                                                 not_url_len + long_url_len);
 883                         }
 884                         inofs += not_url_len + long_url_len;
 885                         outofs += not_url_len + long_url_len;
 886
 887                 } else {
 888                         /* copy the unmodified block */
 889                         strncpy(text + outofs, text + inofs, not_url_len);
 890                         inofs += not_url_len;
 891                         outofs += not_url_len;
 892
 893                         /* copy the new url */
 894                         strncpy(text + outofs, url, short_url_len);
 895                         inofs += long_url_len;
 896                         outofs += short_url_len;
 897                 }
 898
 899                 free(url);
 900         }
 901
 902         /* copy the last block after the last match */
 903         if (inofs) {
 904                 int tail = inlen - inofs;
 905                 if (tail) {
 906                         strncpy(text + outofs, text + inofs, tail);
 907                         outofs += tail;
 908                 }
 909         }
 910
 911         free(ranges);
 912
 913         (void)pcloseRWE(shrink_pid, shrink_pipe);
 914
 915         text[outofs] = 0;
 916         dbg("after len=%u\n", outofs);
 917         return text;
 918 }
 919
 920 int main(int argc, char *argv[], char *envp[])
 921 {
 922         static const struct option options[] = {
 923                 { "debug", 0, NULL, 'd' },
 924                 { "account", 1, NULL, 'a' },
 925                 { "password", 1, NULL, 'p' },
 926                 { "host", 1, NULL, 'H' },
 927                 { "proxy", 1, NULL, 'P' },
 928                 { "action", 1, NULL, 'A' },
 929                 { "user", 1, NULL, 'u' },
 930                 { "logfile", 1, NULL, 'L' },
 931                 { "shrink-urls", 0, NULL, 's' },
 932                 { "help", 0, NULL, 'h' },
 933                 { "bash", 0, NULL, 'b' },
 934                 { "dry-run", 0, NULL, 'n' },
 935                 { "page", 1, NULL, 'g' },
 936                 { "version", 0, NULL, 'v' },
 937                 { }
 938         };
 939         struct session *session;
 940         pid_t child;
 941         char *tweet;
 942         int retval = 0;
 943         int option;
 944         char *http_proxy;
 945         time_t t;
 946         int page_nr;
 947
 948         debug = 0;
 949         rl_bind_key('\t', rl_insert);
 950
 951         session = session_alloc();
 952         if (!session) {
 953                 fprintf(stderr, "no more memory...\n");
 954                 return -1;
 955         }
 956
 957         /* get the current time so that we can log it later */
 958         time(&t);
 959         session->time = strdup(ctime(&t));
 960         session->time[strlen(session->time)-1] = 0x00;
 961
 962         session->homedir = strdup(getenv("HOME"));
 963
 964         curl_global_init(CURL_GLOBAL_ALL);
 965
 966         /* Set environment variables first, before reading command line options
 967          * or config file values. */
 968         http_proxy = getenv("http_proxy");
 969         if (http_proxy) {
 970                 if (session->proxy)
 971                         free(session->proxy);
 972                 session->proxy = strdup(http_proxy);
 973                 dbg("http_proxy = %s\n", session->proxy);
 974         }
 975
 976         parse_configfile(session);
 977
 978         while (1) {
 979                 option = getopt_long_only(argc, argv, "dqe:p:P:H:a:A:u:hg:sn",
 980                                           options, NULL);
 981                 if (option == -1)
 982                         break;
 983                 switch (option) {
 984                 case 'd':
 985                         debug = 1;
 986                         break;
 987                 case 'a':
 988                         if (session->account)
 989                                 free(session->account);
 990                         session->account = strdup(optarg);
 991                         dbg("account = %s\n", session->account);
 992                         break;
 993                 case 'g':
 994                         page_nr = atoi(optarg);
 995                         dbg("page = %d\n", page_nr);
 996                         session->page = page_nr;
 997                         break;
 998                 case 'p':
 999                         if (session->password)
1000                                 free(session->password);
1001                         session->password = strdup(optarg);
1002                         dbg("password = %s\n", session->password);
1003                         break;
1004                 case 'P':
1005                         if (session->proxy)
1006                                 free(session->proxy);
1007                         session->proxy = strdup(optarg);
1008                         dbg("proxy = %s\n", session->proxy);
1009                         break;
1010                 case 'A':
1011                         if (strcasecmp(optarg, "update") == 0)
1012                                 session->action = ACTION_UPDATE;
1013                         else if (strcasecmp(optarg, "friends") == 0)
1014                                 session->action = ACTION_FRIENDS;
1015                         else if (strcasecmp(optarg, "user") == 0)
1016                                 session->action = ACTION_USER;
1017                         else if (strcasecmp(optarg, "replies") == 0)
1018                                 session->action = ACTION_REPLIES;
1019                         else if (strcasecmp(optarg, "public") == 0)
1020                                 session->action = ACTION_PUBLIC;
1021                         else
1022                                 session->action = ACTION_UNKNOWN;
1023                         dbg("action = %d\n", session->action);
1024                         break;
1025                 case 'u':
1026                         if (session->user)
1027                                 free(session->user);
1028                         session->user = strdup(optarg);
1029                         dbg("user = %s\n", session->user);
1030                         break;
1031                 case 'L':
1032                         if (session->logfile)
1033                                 free(session->logfile);
1034                         session->logfile = strdup(optarg);
1035                         dbg("logfile = %s\n", session->logfile);
1036                         break;
1037                 case 's':
1038                         session->shrink_urls = 1;
1039                         break;
1040                 case 'H':
1041                         if (strcasecmp(optarg, "twitter") == 0)
1042                                 session->host = HOST_TWITTER;
1043                         if (strcasecmp(optarg, "identica") == 0)
1044                                 session->host = HOST_IDENTICA;
1045                         dbg("host = %d\n", session->host);
1046                         break;
1047                 case 'b':
1048                         session->bash = 1;
1049                         break;
1050                 case 'h':
1051                         display_help();
1052                         goto exit;
1053                 case 'n':
1054                         session->dry_run = 1;
1055                         break;
1056                 case 'v':
1057                         display_version();
1058                         goto exit;
1059                 default:
1060                         display_help();
1061                         goto exit;
1062                 }
1063         }
1064
1065         /*
1066          * Show the version to make it easier to determine what
1067          * is going on here
1068          */
1069         if (debug)
1070                 display_version();
1071
1072         if (session->action == ACTION_UNKNOWN) {
1073                 fprintf(stderr, "Unknown action, valid actions are:\n");
1074                 fprintf(stderr, "'update', 'friends', 'public', "
1075                         "'replies' or 'user'.\n");
1076                 goto exit;
1077         }
1078
1079         if (!session->account) {
1080                 fprintf(stdout, "Enter twitter account: ");
1081                 session->account = readline(NULL);
1082         }
1083
1084         if (!session->password) {
1085                 fprintf(stdout, "Enter twitter password: ");
1086                 session->password = readline(NULL);
1087         }
1088
1089         if (session->action == ACTION_UPDATE) {
1090                 if (session->bash)
1091                         tweet = get_string_from_stdin();
1092                 else
1093                         tweet = readline("tweet: ");
1094                 if (!tweet || strlen(tweet) == 0) {
1095                         dbg("no tweet?\n");
1096                         return -1;
1097                 }
1098
1099                 if (session->shrink_urls)
1100                         tweet = shrink_urls(tweet);
1101
1102                 session->tweet = zalloc(strlen(tweet) + 10);
1103                 if (session->bash)
1104                         sprintf(session->tweet, "%c %s", getuid() ? '$' : '#', tweet);
1105                 else
1106                         sprintf(session->tweet, "%s", tweet);
1107
1108                 free(tweet);
1109                 dbg("tweet = %s\n", session->tweet);
1110         }
1111
1112         if (!session->user)
1113                 session->user = strdup(session->account);
1114
1115         if (session->page == 0)
1116                 session->page = 1;
1117         dbg("account = %s\n", session->account);
1118         dbg("password = %s\n", session->password);
1119         dbg("host = %d\n", session->host);
1120         dbg("action = %d\n", session->action);
1121
1122         /* fork ourself so that the main shell can get on
1123          * with it's life as we try to connect and handle everything
1124          */
1125         if (session->bash) {
1126                 child = fork();
1127                 if (child) {
1128                         dbg("child is %d\n", child);
1129                         exit(0);
1130                 }
1131         }
1132
1133         retval = send_request(session);
1134         if (retval && !session->bash)
1135                 fprintf(stderr, "operation failed\n");
1136
1137         log_session(session, retval);
1138 exit:
1139         session_free(session);
1140         return retval;;
1141 }