bti.c

   1 /*
   2  * Copyright (C) 2008 Greg Kroah-Hartman <greg@kroah.com>
   3  * Copyright (C) 2009 Bart Trojanowski <bart@jukie.net>
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License as published by the
   7  * Free Software Foundation version 2 of the License.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along
  15  * with this program; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  17  */
  18
  19 #include <stdio.h>
  20 #include <stdlib.h>
  21 #include <stddef.h>
  22 #include <string.h>
  23 #include <getopt.h>
  24 #include <errno.h>
  25 #include <ctype.h>
  26 #include <fcntl.h>
  27 #include <unistd.h>
  28 #include <time.h>
  29 #include <sys/stat.h>
  30 #include <sys/types.h>
  31 #include <sys/wait.h>
  32 #include <curl/curl.h>
  33 #include <readline/readline.h>
  34 #include <libxml/xmlmemory.h>
  35 #include <libxml/parser.h>
  36 #include <libxml/tree.h>
  37 #include <pcre.h>
  38 #include "bti_version.h"
  39
  40
  41 #define zalloc(size)    calloc(size, 1)
  42
  43 #define dbg(format, arg...)                                             \
  44         do {                                                            \
  45                 if (debug)                                              \
  46                         fprintf(stdout, "bti: %s: " format , __func__ , \
  47                                 ## arg);                                \
  48         } while (0)
  49
  50
  51 static int debug;
  52
  53 enum host {
  54         HOST_TWITTER = 0,
  55         HOST_IDENTICA = 1,
  56 };
  57
  58 enum action {
  59         ACTION_UPDATE = 0,
  60         ACTION_FRIENDS = 1,
  61         ACTION_USER = 2,
  62         ACTION_REPLIES = 4,
  63         ACTION_PUBLIC = 8,
  64         ACTION_UNKNOWN = 16
  65 };
  66
  67 struct session {
  68         char *password;
  69         char *account;
  70         char *tweet;
  71         char *proxy;
  72         char *time;
  73         char *homedir;
  74         char *logfile;
  75         char *user;
  76         int bash;
  77         int shrink_urls;
  78         int dry_run;
  79         int page;
  80         enum host host;
  81         enum action action;
  82 };
  83
  84 struct bti_curl_buffer {
  85         char *data;
  86         enum action action;
  87         int length;
  88 };
  89
  90 static void display_help(void)
  91 {
  92         fprintf(stdout, "bti - send tweet to twitter or identi.ca\n");
  93         fprintf(stdout, "Version: " BTI_VERSION "\n");
  94         fprintf(stdout, "Usage:\n");
  95         fprintf(stdout, "  bti [options]\n");
  96         fprintf(stdout, "options are:\n");
  97         fprintf(stdout, "  --account accountname\n");
  98         fprintf(stdout, "  --password password\n");
  99         fprintf(stdout, "  --action action\n");
 100         fprintf(stdout, "    ('update', 'friends', 'public', 'replies' "
 101                 "or 'user')\n");
 102         fprintf(stdout, "  --user screenname\n");
 103         fprintf(stdout, "  --proxy PROXY:PORT\n");
 104         fprintf(stdout, "  --host HOST\n");
 105         fprintf(stdout, "  --logfile logfile\n");
 106         fprintf(stdout, "  --shrink-urls\n");
 107         fprintf(stdout, "  --page PAGENUMBER\n");
 108         fprintf(stdout, "  --bash\n");
 109         fprintf(stdout, "  --debug\n");
 110         fprintf(stdout, "  --version\n");
 111         fprintf(stdout, "  --help\n");
 112 }
 113
 114 static void display_version(void)
 115 {
 116         fprintf(stdout, "bti - version %s\n", BTI_VERSION);
 117 }
 118
 119 static struct session *session_alloc(void)
 120 {
 121         struct session *session;
 122
 123         session = zalloc(sizeof(*session));
 124         if (!session)
 125                 return NULL;
 126         return session;
 127 }
 128
 129 static void session_free(struct session *session)
 130 {
 131         if (!session)
 132                 return;
 133         free(session->password);
 134         free(session->account);
 135         free(session->tweet);
 136         free(session->proxy);
 137         free(session->time);
 138         free(session->homedir);
 139         free(session->user);
 140         free(session);
 141 }
 142
 143 static struct bti_curl_buffer *bti_curl_buffer_alloc(enum action action)
 144 {
 145         struct bti_curl_buffer *buffer;
 146
 147         buffer = zalloc(sizeof(*buffer));
 148         if (!buffer)
 149                 return NULL;
 150
 151         /* start out with a data buffer of 1 byte to
 152          * make the buffer fill logic simpler */
 153         buffer->data = zalloc(1);
 154         if (!buffer->data) {
 155                 free(buffer);
 156                 return NULL;
 157         }
 158         buffer->length = 0;
 159         buffer->action = action;
 160         return buffer;
 161 }
 162
 163 static void bti_curl_buffer_free(struct bti_curl_buffer *buffer)
 164 {
 165         if (!buffer)
 166                 return;
 167         free(buffer->data);
 168         free(buffer);
 169 }
 170
 171 static const char *twitter_user_url    = "http://twitter.com/statuses/user_timeline/";
 172 static const char *twitter_update_url  = "https://twitter.com/statuses/update.xml";
 173 static const char *twitter_public_url  = "http://twitter.com/statuses/public_timeline.xml";
 174 static const char *twitter_friends_url = "https://twitter.com/statuses/friends_timeline.xml";
 175 static const char *twitter_replies_url = "http://twitter.com/statuses/replies.xml";
 176
 177 static const char *identica_user_url    = "http://identi.ca/api/statuses/user_timeline/";
 178 static const char *identica_update_url  = "http://identi.ca/api/statuses/update.xml";
 179 static const char *identica_public_url  = "http://identi.ca/api/statuses/public_timeline.xml";
 180 static const char *identica_friends_url = "http://identi.ca/api/statuses/friends_timeline.xml";
 181 static const char *identica_replies_url = "http://identi.ca/api/statuses/replies.xml";
 182
 183 static CURL *curl_init(void)
 184 {
 185         CURL *curl;
 186
 187         curl = curl_easy_init();
 188         if (!curl) {
 189                 fprintf(stderr, "Can not init CURL!\n");
 190                 return NULL;
 191         }
 192         /* some ssl sanity checks on the connection we are making */
 193         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0);
 194         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0);
 195         return curl;
 196 }
 197
 198 void parse_statuses(xmlDocPtr doc, xmlNodePtr current)
 199 {
 200         xmlChar *text = NULL;
 201         xmlChar *user = NULL;
 202         xmlNodePtr userinfo;
 203
 204         current = current->xmlChildrenNode;
 205         while (current != NULL) {
 206                 if (current->type == XML_ELEMENT_NODE) {
 207                         if (!xmlStrcmp(current->name, (const xmlChar *)"text"))
 208                                 text = xmlNodeListGetString(doc, current->xmlChildrenNode, 1);
 209                         if (!xmlStrcmp(current->name, (const xmlChar *)"user")) {
 210                                 userinfo = current->xmlChildrenNode;
 211                                 while (userinfo != NULL) {
 212                                         if ((!xmlStrcmp(userinfo->name, (const xmlChar *)"screen_name"))) {
 213                                                 if (user)
 214                                                         xmlFree(user);
 215                                                 user = xmlNodeListGetString(doc, userinfo->xmlChildrenNode, 1);
 216                                         }
 217                                         userinfo = userinfo->next;
 218                                 }
 219                         }
 220                         if (user && text) {
 221                                 printf("[%s] %s\n", user, text);
 222                                 xmlFree(user);
 223                                 xmlFree(text);
 224                                 user = NULL;
 225                                 text = NULL;
 226                         }
 227                 }
 228                 current = current->next;
 229         }
 230
 231         return;
 232 }
 233
 234 static void parse_timeline(char *document)
 235 {
 236         xmlDocPtr doc;
 237         xmlNodePtr current;
 238
 239         doc = xmlReadMemory(document, strlen(document), "timeline.xml",
 240                             NULL, XML_PARSE_NOERROR);
 241         if (doc == NULL)
 242                 return;
 243
 244         current = xmlDocGetRootElement(doc);
 245         if (current == NULL) {
 246                 fprintf(stderr, "empty document\n");
 247                 xmlFreeDoc(doc);
 248                 return;
 249         }
 250
 251         if (xmlStrcmp(current->name, (const xmlChar *) "statuses")) {
 252                 fprintf(stderr, "unexpected document type\n");
 253                 xmlFreeDoc(doc);
 254                 return;
 255         }
 256
 257         current = current->xmlChildrenNode;
 258         while (current != NULL) {
 259                 if ((!xmlStrcmp(current->name, (const xmlChar *)"status")))
 260                         parse_statuses(doc, current);
 261                 current = current->next;
 262         }
 263         xmlFreeDoc(doc);
 264
 265         return;
 266 }
 267
 268 size_t curl_callback(void *buffer, size_t size, size_t nmemb, void *userp)
 269 {
 270         struct bti_curl_buffer *curl_buf = userp;
 271         size_t buffer_size = size * nmemb;
 272         char *temp;
 273
 274         if ((!buffer) || (!buffer_size) || (!curl_buf))
 275                 return -EINVAL;
 276
 277         /* add to the data we already have */
 278         temp = zalloc(curl_buf->length + buffer_size + 1);
 279         if (!temp)
 280                 return -ENOMEM;
 281
 282         memcpy(temp, curl_buf->data, curl_buf->length);
 283         free(curl_buf->data);
 284         curl_buf->data = temp;
 285         memcpy(&curl_buf->data[curl_buf->length], (char *)buffer, buffer_size);
 286         curl_buf->length += buffer_size;
 287         if (curl_buf->action)
 288                 parse_timeline(curl_buf->data);
 289
 290         dbg("%s\n", curl_buf->data);
 291
 292         return buffer_size;
 293 }
 294
 295 static int send_request(struct session *session)
 296 {
 297         char user_password[500];
 298         char data[500];
 299         /* is there usernames longer than 22 chars? */
 300         char user_url[70];
 301         struct bti_curl_buffer *curl_buf;
 302         CURL *curl = NULL;
 303         CURLcode res;
 304         struct curl_httppost *formpost = NULL;
 305         struct curl_httppost *lastptr = NULL;
 306         struct curl_slist *slist = NULL;
 307
 308         if (!session)
 309                 return -EINVAL;
 310
 311         curl_buf = bti_curl_buffer_alloc(session->action);
 312         if (!curl_buf)
 313                 return -ENOMEM;
 314
 315         curl = curl_init();
 316         if (!curl)
 317                 return -EINVAL;
 318
 319         switch (session->action) {
 320         case ACTION_UPDATE:
 321                 snprintf(user_password, sizeof(user_password), "%s:%s",
 322                          session->account, session->password);
 323                 snprintf(data, sizeof(data), "status=\"%s\"", session->tweet);
 324                 curl_formadd(&formpost, &lastptr,
 325                              CURLFORM_COPYNAME, "status",
 326                              CURLFORM_COPYCONTENTS, session->tweet,
 327                              CURLFORM_END);
 328
 329                 curl_formadd(&formpost, &lastptr,
 330                              CURLFORM_COPYNAME, "source",
 331                              CURLFORM_COPYCONTENTS, "bti",
 332                              CURLFORM_END);
 333
 334                 curl_easy_setopt(curl, CURLOPT_HTTPPOST, formpost);
 335                 slist = curl_slist_append(slist, "Expect:");
 336                 curl_easy_setopt(curl, CURLOPT_HTTPHEADER, slist);
 337                 switch (session->host) {
 338                 case HOST_TWITTER:
 339                         curl_easy_setopt(curl, CURLOPT_URL,
 340                                          twitter_update_url);
 341                         break;
 342                 case HOST_IDENTICA:
 343                         curl_easy_setopt(curl, CURLOPT_URL,
 344                                          identica_update_url);
 345                         break;
 346                 }
 347                 curl_easy_setopt(curl, CURLOPT_USERPWD, user_password);
 348
 349                 break;
 350         case ACTION_FRIENDS:
 351                 snprintf(user_password, sizeof(user_password), "%s:%s",
 352                          session->account, session->password);
 353                 switch (session->host) {
 354                 case HOST_TWITTER:
 355                         sprintf(user_url, "%s?page=%d", twitter_friends_url, session->page);
 356                         curl_easy_setopt(curl, CURLOPT_URL, user_url);
 357                         break;
 358                 case HOST_IDENTICA:
 359                         sprintf(user_url, "%s?page=%d", identica_friends_url, session->page);
 360                         curl_easy_setopt(curl, CURLOPT_URL, user_url);
 361                         break;
 362                 }
 363                 curl_easy_setopt(curl, CURLOPT_USERPWD, user_password);
 364
 365                 break;
 366         case ACTION_USER:
 367                 switch (session->host) {
 368                 case HOST_TWITTER:
 369                         sprintf(user_url, "%s%s.xml?page=%d", twitter_user_url, session->user, session->page);
 370                         curl_easy_setopt(curl, CURLOPT_URL, user_url);
 371                         break;
 372                 case HOST_IDENTICA:
 373                         sprintf(user_url, "%s%s.xml?page=%d", identica_user_url, session->user, session->page);
 374                         curl_easy_setopt(curl, CURLOPT_URL, user_url);
 375                         break;
 376                 }
 377
 378                 break;
 379         case ACTION_REPLIES:
 380                 snprintf(user_password, sizeof(user_password), "%s:%s",
 381                          session->account, session->password);
 382                 switch (session->host) {
 383                 case HOST_TWITTER:
 384                         sprintf(user_url, "%s?page=%d", twitter_replies_url, session->page);
 385                         curl_easy_setopt(curl, CURLOPT_URL, user_url);
 386                         break;
 387                 case HOST_IDENTICA:
 388                         sprintf(user_url, "%s?page=%d", identica_replies_url, session->page);
 389                         curl_easy_setopt(curl, CURLOPT_URL, user_url);
 390                         break;
 391                 }
 392                 curl_easy_setopt(curl, CURLOPT_USERPWD, user_password);
 393
 394                 break;
 395         case ACTION_PUBLIC:
 396                 switch (session->host) {
 397                 case HOST_TWITTER:
 398                         sprintf(user_url, "%s?page=%d", twitter_public_url, session->page);
 399                         curl_easy_setopt(curl, CURLOPT_URL, user_url);
 400                         break;
 401                 case HOST_IDENTICA:
 402                         sprintf(user_url, "%s?page=%d", identica_public_url, session->page);
 403                         curl_easy_setopt(curl, CURLOPT_URL, user_url);
 404                         break;
 405                 }
 406
 407                 break;
 408         default:
 409                 break;
 410         }
 411
 412         if (session->proxy)
 413                 curl_easy_setopt(curl, CURLOPT_PROXY, session->proxy);
 414
 415         if (debug)
 416                 curl_easy_setopt(curl, CURLOPT_VERBOSE, 1);
 417
 418         dbg("user_password = %s\n", user_password);
 419         dbg("data = %s\n", data);
 420         dbg("proxy = %s\n", session->proxy);
 421
 422         curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, curl_callback);
 423         curl_easy_setopt(curl, CURLOPT_WRITEDATA, curl_buf);
 424         if (!session->dry_run) {
 425                 res = curl_easy_perform(curl);
 426                 if (res && !session->bash) {
 427                         fprintf(stderr, "error(%d) trying to perform "
 428                                 "operation\n", res);
 429                         return -EINVAL;
 430                 }
 431         }
 432
 433         curl_easy_cleanup(curl);
 434         if (session->action == ACTION_UPDATE)
 435                 curl_formfree(formpost);
 436         bti_curl_buffer_free(curl_buf);
 437         return 0;
 438 }
 439
 440 static void parse_configfile(struct session *session)
 441 {
 442         FILE *config_file;
 443         char *line = NULL;
 444         size_t len = 0;
 445         char *account = NULL;
 446         char *password = NULL;
 447         char *host = NULL;
 448         char *proxy = NULL;
 449         char *logfile = NULL;
 450         char *action = NULL;
 451         char *user = NULL;
 452         char *file;
 453         int shrink_urls = 0;
 454
 455         /* config file is ~/.bti  */
 456         file = alloca(strlen(session->homedir) + 7);
 457
 458         sprintf(file, "%s/.bti", session->homedir);
 459
 460         config_file = fopen(file, "r");
 461
 462         /* No error if file does not exist or is unreadable.  */
 463         if (config_file == NULL)
 464                 return;
 465
 466         do {
 467                 ssize_t n = getline(&line, &len, config_file);
 468                 if (n < 0)
 469                         break;
 470                 if (line[n - 1] == '\n')
 471                         line[n - 1] = '\0';
 472                 /* Parse file.  Format is the usual value pairs:
 473                    account=name
 474                    passwort=value
 475                    # is a comment character
 476                 */
 477                 *strchrnul(line, '#') = '\0';
 478                 char *c = line;
 479                 while (isspace(*c))
 480                         c++;
 481                 /* Ignore blank lines.  */
 482                 if (c[0] == '\0')
 483                         continue;
 484
 485                 if (!strncasecmp(c, "account", 7) && (c[7] == '=')) {
 486                         c += 8;
 487                         if (c[0] != '\0')
 488                                 account = strdup(c);
 489                 } else if (!strncasecmp(c, "password", 8) &&
 490                            (c[8] == '=')) {
 491                         c += 9;
 492                         if (c[0] != '\0')
 493                                 password = strdup(c);
 494                 } else if (!strncasecmp(c, "host", 4) &&
 495                            (c[4] == '=')) {
 496                         c += 5;
 497                         if (c[0] != '\0')
 498                                 host = strdup(c);
 499                 } else if (!strncasecmp(c, "proxy", 5) &&
 500                            (c[5] == '=')) {
 501                         c += 6;
 502                         if (c[0] != '\0')
 503                                 proxy = strdup(c);
 504                 } else if (!strncasecmp(c, "logfile", 7) &&
 505                            (c[7] == '=')) {
 506                         c += 8;
 507                         if (c[0] != '\0')
 508                                 logfile = strdup(c);
 509                 } else if (!strncasecmp(c, "action", 6) &&
 510                            (c[6] == '=')) {
 511                         c += 7;
 512                         if (c[0] != '\0')
 513                                 action = strdup(c);
 514                 } else if (!strncasecmp(c, "user", 4) &&
 515                                 (c[4] == '=')) {
 516                         c += 5;
 517                         if (c[0] != '\0')
 518                                 user = strdup(c);
 519                 } else if (!strncasecmp(c, "shrink-urls", 11) &&
 520                                 (c[11] == '=')) {
 521                         c += 12;
 522                         if (!strncasecmp(c, "true", 4) ||
 523                                         !strncasecmp(c, "yes", 3))
 524                                 shrink_urls = 1;
 525                 }
 526         } while (!feof(config_file));
 527
 528         if (password)
 529                 session->password = password;
 530         if (account)
 531                 session->account = account;
 532         if (host) {
 533                 if (strcasecmp(host, "twitter") == 0)
 534                         session->host = HOST_TWITTER;
 535                 if (strcasecmp(host, "identica") == 0)
 536                         session->host = HOST_IDENTICA;
 537                 free(host);
 538         }
 539         if (proxy) {
 540                 if (session->proxy)
 541                         free(session->proxy);
 542                 session->proxy = proxy;
 543         }
 544         if (logfile)
 545                 session->logfile = logfile;
 546         if (action) {
 547                 if (strcasecmp(action, "update") == 0)
 548                         session->action = ACTION_UPDATE;
 549                 else if (strcasecmp(action, "friends") == 0)
 550                         session->action = ACTION_FRIENDS;
 551                 else if (strcasecmp(action, "user") == 0)
 552                         session->action = ACTION_USER;
 553                 else if (strcasecmp(action, "replies") == 0)
 554                         session->action = ACTION_REPLIES;
 555                 else if (strcasecmp(action, "public") == 0)
 556                         session->action = ACTION_PUBLIC;
 557                 else
 558                         session->action = ACTION_UNKNOWN;
 559                 free(action);
 560         }
 561         if (user)
 562                 session->user = user;
 563         session->shrink_urls = shrink_urls;
 564
 565         /* Free buffer and close file.  */
 566         free(line);
 567         fclose(config_file);
 568 }
 569
 570 static void log_session(struct session *session, int retval)
 571 {
 572         FILE *log_file;
 573         char *filename;
 574         char *host;
 575
 576         /* Only log something if we have a log file set */
 577         if (!session->logfile)
 578                 return;
 579
 580         filename = alloca(strlen(session->homedir) +
 581                           strlen(session->logfile) + 3);
 582
 583         sprintf(filename, "%s/%s", session->homedir, session->logfile);
 584
 585         log_file = fopen(filename, "a+");
 586         if (log_file == NULL)
 587                 return;
 588         switch (session->host) {
 589         case HOST_TWITTER:
 590                 host = "twitter";
 591                 break;
 592         case HOST_IDENTICA:
 593                 host = "identi.ca";
 594                 break;
 595         default:
 596                 host = "unknown";
 597                 break;
 598         }
 599
 600         switch (session->action) {
 601         case ACTION_UPDATE:
 602                 if (retval)
 603                         fprintf(log_file, "%s: host=%s tweet failed\n",
 604                                 session->time, host);
 605                 else
 606                         fprintf(log_file, "%s: host=%s tweet=%s\n",
 607                                 session->time, host, session->tweet);
 608                 break;
 609         case ACTION_FRIENDS:
 610                 fprintf(log_file, "%s: host=%s retrieving friends timeline\n",
 611                         session->time, host);
 612                 break;
 613         case ACTION_USER:
 614                 fprintf(log_file, "%s: host=%s retrieving %s's timeline\n",
 615                         session->time, host, session->user);
 616                 break;
 617         case ACTION_REPLIES:
 618                 fprintf(log_file, "%s: host=%s retrieving replies\n",
 619                         session->time, host);
 620                 break;
 621         case ACTION_PUBLIC:
 622                 fprintf(log_file, "%s: host=%s retrieving public timeline\n",
 623                         session->time, host);
 624                 break;
 625         default:
 626                 break;
 627         }
 628
 629         fclose(log_file);
 630 }
 631
 632 static char *get_string_from_stdin(void)
 633 {
 634         char *temp;
 635         char *string;
 636
 637         string = zalloc(1000);
 638         if (!string)
 639                 return NULL;
 640
 641         if (!fgets(string, 999, stdin))
 642                 return NULL;
 643         temp = strchr(string, '\n');
 644         *temp = '\0';
 645         return string;
 646 }
 647
 648 static int find_urls(const char *tweet, int **pranges)
 649 {
 650         /*
 651          * magic obtained from
 652          * http://www.geekpedia.com/KB65_How-to-validate-an-URL-using-RegEx-in-Csharp.html
 653          */
 654         static const char *re_magic =
 655                 "(([a-zA-Z][0-9a-zA-Z+\\-\\.]*:)/{1,3}"
 656                 "[0-9a-zA-Z;/~?:@&=+$\\.\\-_'()%]+)"
 657                 "(#[0-9a-zA-Z;/?:@&=+$\\.\\-_!~*'()%]+)?";
 658         pcre *re;
 659         const char *errptr;
 660         int erroffset;
 661         int ovector[10] = {0,};
 662         const size_t ovsize = sizeof(ovector)/sizeof(*ovector);
 663         int startoffset, tweetlen;
 664         int i, rc;
 665         int rbound = 10;
 666         int rcount = 0;
 667         int *ranges = malloc(sizeof(int) * rbound);
 668
 669         re = pcre_compile(re_magic,
 670                         PCRE_NO_AUTO_CAPTURE,
 671                         &errptr, &erroffset, NULL);
 672         if (!re) {
 673                 fprintf(stderr, "pcre_compile @%u: %s\n", erroffset, errptr);
 674                 exit(1);
 675         }
 676
 677         tweetlen = strlen(tweet);
 678         for (startoffset = 0; startoffset < tweetlen; ) {
 679
 680                 rc = pcre_exec(re, NULL, tweet, strlen(tweet), startoffset, 0,
 681                                 ovector, ovsize);
 682                 if (rc == PCRE_ERROR_NOMATCH)
 683                         break;
 684
 685                 if (rc < 0) {
 686                         fprintf(stderr, "pcre_exec @%u: %s\n",
 687                                 erroffset, errptr);
 688                         exit(1);
 689                 }
 690
 691                 for (i = 0; i < rc; i += 2) {
 692                         if ((rcount+2) == rbound) {
 693                                 rbound *= 2;
 694                                 ranges = realloc(ranges, sizeof(int) * rbound);
 695                         }
 696
 697                         ranges[rcount++] = ovector[i];
 698                         ranges[rcount++] = ovector[i+1];
 699                 }
 700
 701                 startoffset = ovector[1];
 702         }
 703
 704         pcre_free(re);
 705
 706         *pranges = ranges;
 707         return rcount;
 708 }
 709
 710 /**
 711  * bidirectional popen() call
 712  *
 713  * @param rwepipe - int array of size three
 714  * @param exe - program to run
 715  * @param argv - argument list
 716  * @return pid or -1 on error
 717  *
 718  * The caller passes in an array of three integers (rwepipe), on successful
 719  * execution it can then write to element 0 (stdin of exe), and read from
 720  * element 1 (stdout) and 2 (stderr).
 721  */
 722 static int popenRWE(int *rwepipe, const char *exe, const char *const argv[])
 723 {
 724         int in[2];
 725         int out[2];
 726         int err[2];
 727         int pid;
 728         int rc;
 729
 730         rc = pipe(in);
 731         if (rc < 0)
 732                 goto error_in;
 733
 734         rc = pipe(out);
 735         if (rc < 0)
 736                 goto error_out;
 737
 738         rc = pipe(err);
 739         if (rc < 0)
 740                 goto error_err;
 741
 742         pid = fork();
 743         if (pid > 0) {
 744                 /* parent */
 745                 close(in[0]);
 746                 close(out[1]);
 747                 close(err[1]);
 748                 rwepipe[0] = in[1];
 749                 rwepipe[1] = out[0];
 750                 rwepipe[2] = err[0];
 751                 return pid;
 752         } else if (pid == 0) {
 753                 /* child */
 754                 close(in[1]);
 755                 close(out[0]);
 756                 close(err[0]);
 757                 close(0);
 758                 rc = dup(in[0]);
 759                 close(1);
 760                 rc = dup(out[1]);
 761                 close(2);
 762                 rc = dup(err[1]);
 763
 764                 execvp(exe, (char **)argv);
 765                 exit(1);
 766         } else
 767                 goto error_fork;
 768
 769         return pid;
 770
 771 error_fork:
 772         close(err[0]);
 773         close(err[1]);
 774 error_err:
 775         close(out[0]);
 776         close(out[1]);
 777 error_out:
 778         close(in[0]);
 779         close(in[1]);
 780 error_in:
 781         return -1;
 782 }
 783
 784 static int pcloseRWE(int pid, int *rwepipe)
 785 {
 786         int rc, status;
 787         close(rwepipe[0]);
 788         close(rwepipe[1]);
 789         close(rwepipe[2]);
 790         rc = waitpid(pid, &status, 0);
 791         return status;
 792 }
 793
 794 static char *shrink_one_url(int *rwepipe, char *big)
 795 {
 796         int biglen = strlen(big);
 797         char *small;
 798         int smalllen;
 799         int rc;
 800
 801         rc = dprintf(rwepipe[0], "%s\n", big);
 802         if (rc < 0)
 803                 return big;
 804
 805         smalllen = biglen + 128;
 806         small = malloc(smalllen);
 807         if (!small)
 808                 return big;
 809
 810         rc = read(rwepipe[1], small, smalllen);
 811         if (rc < 0 || rc > biglen)
 812                 goto error_free_small;
 813
 814         if (strncmp(small, "http://", 7))
 815                 goto error_free_small;
 816
 817         smalllen = rc;
 818         while (smalllen && isspace(small[smalllen-1]))
 819                         small[--smalllen] = 0;
 820
 821         free(big);
 822         return small;
 823
 824 error_free_small:
 825         free(small);
 826         return big;
 827 }
 828
 829 static char *shrink_urls(char *text)
 830 {
 831         int *ranges;
 832         int rcount;
 833         int i;
 834         int inofs = 0;
 835         int outofs = 0;
 836         const char *const shrink_args[] = {
 837                 "bti-shrink-urls",
 838                 NULL
 839         };
 840         int shrink_pid;
 841         int shrink_pipe[3];
 842         int inlen = strlen(text);
 843
 844         dbg("before len=%u\n", inlen);
 845
 846         shrink_pid = popenRWE(shrink_pipe, shrink_args[0], shrink_args);
 847         if (shrink_pid < 0)
 848                 return text;
 849
 850         rcount = find_urls(text, &ranges);
 851         if (!rcount)
 852                 return text;
 853
 854         for (i = 0; i < rcount; i += 2) {
 855                 int url_start = ranges[i];
 856                 int url_end = ranges[i+1];
 857                 int long_url_len = url_end - url_start;
 858                 char *url = strndup(text + url_start, long_url_len);
 859                 int short_url_len;
 860                 int not_url_len = url_start - inofs;
 861
 862                 dbg("long  url[%u]: %s\n", long_url_len, url);
 863                 url = shrink_one_url(shrink_pipe, url);
 864                 short_url_len = url ? strlen(url) : 0;
 865                 dbg("short url[%u]: %s\n", short_url_len, url);
 866
 867                 if (!url || short_url_len >= long_url_len) {
 868                         /* The short url ended up being too long
 869                          * or unavailable */
 870                         if (inofs) {
 871                                 strncpy(text + outofs, text + inofs,
 872                                                 not_url_len + long_url_len);
 873                         }
 874                         inofs += not_url_len + long_url_len;
 875                         outofs += not_url_len + long_url_len;
 876
 877                 } else {
 878                         /* copy the unmodified block */
 879                         strncpy(text + outofs, text + inofs, not_url_len);
 880                         inofs += not_url_len;
 881                         outofs += not_url_len;
 882
 883                         /* copy the new url */
 884                         strncpy(text + outofs, url, short_url_len);
 885                         inofs += long_url_len;
 886                         outofs += short_url_len;
 887                 }
 888
 889                 free(url);
 890         }
 891
 892         /* copy the last block after the last match */
 893         if (inofs) {
 894                 int tail = inlen - inofs;
 895                 if (tail) {
 896                         strncpy(text + outofs, text + inofs, tail);
 897                         outofs += tail;
 898                 }
 899         }
 900
 901         free(ranges);
 902
 903         (void)pcloseRWE(shrink_pid, shrink_pipe);
 904
 905         text[outofs] = 0;
 906         dbg("after len=%u\n", outofs);
 907         return text;
 908 }
 909
 910 int main(int argc, char *argv[], char *envp[])
 911 {
 912         static const struct option options[] = {
 913                 { "debug", 0, NULL, 'd' },
 914                 { "account", 1, NULL, 'a' },
 915                 { "password", 1, NULL, 'p' },
 916                 { "host", 1, NULL, 'H' },
 917                 { "proxy", 1, NULL, 'P' },
 918                 { "action", 1, NULL, 'A' },
 919                 { "user", 1, NULL, 'u' },
 920                 { "logfile", 1, NULL, 'L' },
 921                 { "shrink-urls", 0, NULL, 's' },
 922                 { "help", 0, NULL, 'h' },
 923                 { "bash", 0, NULL, 'b' },
 924                 { "dry-run", 0, NULL, 'n' },
 925                 { "page", 1, NULL, 'g' },
 926                 { "version", 0, NULL, 'v' },
 927                 { }
 928         };
 929         struct session *session;
 930         pid_t child;
 931         char *tweet;
 932         int retval = 0;
 933         int option;
 934         char *http_proxy;
 935         time_t t;
 936         int page_nr;
 937
 938         debug = 0;
 939         rl_bind_key('\t', rl_insert);
 940
 941         session = session_alloc();
 942         if (!session) {
 943                 fprintf(stderr, "no more memory...\n");
 944                 return -1;
 945         }
 946
 947         /* get the current time so that we can log it later */
 948         time(&t);
 949         session->time = strdup(ctime(&t));
 950         session->time[strlen(session->time)-1] = 0x00;
 951
 952         session->homedir = strdup(getenv("HOME"));
 953
 954         curl_global_init(CURL_GLOBAL_ALL);
 955
 956         /* Set environment variables first, before reading command line options
 957          * or config file values. */
 958         http_proxy = getenv("http_proxy");
 959         if (http_proxy) {
 960                 if (session->proxy)
 961                         free(session->proxy);
 962                 session->proxy = strdup(http_proxy);
 963                 dbg("http_proxy = %s\n", session->proxy);
 964         }
 965
 966         parse_configfile(session);
 967
 968         while (1) {
 969                 option = getopt_long_only(argc, argv, "dqe:p:P:H:a:A:u:hg:",
 970                                           options, NULL);
 971                 if (option == -1)
 972                         break;
 973                 switch (option) {
 974                 case 'd':
 975                         debug = 1;
 976                         break;
 977                 case 'a':
 978                         if (session->account)
 979                                 free(session->account);
 980                         session->account = strdup(optarg);
 981                         dbg("account = %s\n", session->account);
 982                         break;
 983                 case 'g':
 984                         page_nr = atoi(optarg);
 985                         dbg("page = %d\n", page_nr);
 986                         session->page = page_nr;
 987                         break;
 988                 case 'p':
 989                         if (session->password)
 990                                 free(session->password);
 991                         session->password = strdup(optarg);
 992                         dbg("password = %s\n", session->password);
 993                         break;
 994                 case 'P':
 995                         if (session->proxy)
 996                                 free(session->proxy);
 997                         session->proxy = strdup(optarg);
 998                         dbg("proxy = %s\n", session->proxy);
 999                         break;
1000                 case 'A':
1001                         if (strcasecmp(optarg, "update") == 0)
1002                                 session->action = ACTION_UPDATE;
1003                         else if (strcasecmp(optarg, "friends") == 0)
1004                                 session->action = ACTION_FRIENDS;
1005                         else if (strcasecmp(optarg, "user") == 0)
1006                                 session->action = ACTION_USER;
1007                         else if (strcasecmp(optarg, "replies") == 0)
1008                                 session->action = ACTION_REPLIES;
1009                         else if (strcasecmp(optarg, "public") == 0)
1010                                 session->action = ACTION_PUBLIC;
1011                         else
1012                                 session->action = ACTION_UNKNOWN;
1013                         dbg("action = %d\n", session->action);
1014                         break;
1015                 case 'u':
1016                         if (session->user)
1017                                 free(session->user);
1018                         session->user = strdup(optarg);
1019                         dbg("user = %s\n", session->user);
1020                         break;
1021                 case 'L':
1022                         if (session->logfile)
1023                                 free(session->logfile);
1024                         session->logfile = strdup(optarg);
1025                         dbg("logfile = %s\n", session->logfile);
1026                         break;
1027                 case 's':
1028                         session->shrink_urls = 1;
1029                         break;
1030                 case 'H':
1031                         if (strcasecmp(optarg, "twitter") == 0)
1032                                 session->host = HOST_TWITTER;
1033                         if (strcasecmp(optarg, "identica") == 0)
1034                                 session->host = HOST_IDENTICA;
1035                         dbg("host = %d\n", session->host);
1036                         break;
1037                 case 'b':
1038                         session->bash = 1;
1039                         break;
1040                 case 'h':
1041                         display_help();
1042                         goto exit;
1043                 case 'n':
1044                         session->dry_run = 1;
1045                         break;
1046                 case 'v':
1047                         display_version();
1048                         goto exit;
1049                 default:
1050                         display_help();
1051                         goto exit;
1052                 }
1053         }
1054
1055         /*
1056          * Show the version to make it easier to determine what
1057          * is going on here
1058          */
1059         if (debug)
1060                 display_version();
1061
1062         if (session->action == ACTION_UNKNOWN) {
1063                 fprintf(stderr, "Unknown action, valid actions are:\n");
1064                 fprintf(stderr, "'update', 'friends', 'public', "
1065                         "'replies' or 'user'.\n");
1066                 goto exit;
1067         }
1068
1069         if (!session->account) {
1070                 fprintf(stdout, "Enter twitter account: ");
1071                 session->account = readline(NULL);
1072         }
1073
1074         if (!session->password) {
1075                 fprintf(stdout, "Enter twitter password: ");
1076                 session->password = readline(NULL);
1077         }
1078
1079         if (session->action == ACTION_UPDATE) {
1080                 if (session->bash)
1081                         tweet = get_string_from_stdin();
1082                 else
1083                         tweet = readline("tweet: ");
1084                 if (!tweet || strlen(tweet) == 0) {
1085                         dbg("no tweet?\n");
1086                         return -1;
1087                 }
1088
1089                 if (session->shrink_urls)
1090                         tweet = shrink_urls(tweet);
1091
1092                 session->tweet = zalloc(strlen(tweet) + 10);
1093                 if (session->bash)
1094                         sprintf(session->tweet, "%c %s", getuid() ? '$' : '#', tweet);
1095                 else
1096                         sprintf(session->tweet, "%s", tweet);
1097
1098                 free(tweet);
1099                 dbg("tweet = %s\n", session->tweet);
1100         }
1101
1102         if (!session->user)
1103                 session->user = strdup(session->account);
1104
1105         if (session->page == 0)
1106                 session->page = 1;
1107         dbg("account = %s\n", session->account);
1108         dbg("password = %s\n", session->password);
1109         dbg("host = %d\n", session->host);
1110         dbg("action = %d\n", session->action);
1111
1112         /* fork ourself so that the main shell can get on
1113          * with it's life as we try to connect and handle everything
1114          */
1115         if (session->bash) {
1116                 child = fork();
1117                 if (child) {
1118                         dbg("child is %d\n", child);
1119                         exit(0);
1120                 }
1121         }
1122
1123         retval = send_request(session);
1124         if (retval && !session->bash)
1125                 fprintf(stderr, "operation failed\n");
1126
1127         log_session(session, retval);
1128 exit:
1129         session_free(session);
1130         return retval;;
1131 }