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