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