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 <libxml/xmlmemory.h>
  37 #include <libxml/parser.h>
  38 #include <libxml/tree.h>
  39 #include <pcre.h>
  40 #include <termios.h>
  41 #include <dlfcn.h>
  42
  43
  44 #define zalloc(size)    calloc(size, 1)
  45
  46 #define dbg(format, arg...)                                             \
  47         do {                                                            \
  48                 if (debug)                                              \
  49                         fprintf(stdout, "bti: %s: " format , __func__ , \
  50                                 ## arg);                                \
  51         } while (0)
  52
  53
  54 static int debug;
  55 static int verbose;
  56
  57 enum host {
  58         HOST_TWITTER  = 0,
  59         HOST_IDENTICA = 1,
  60         HOST_CUSTOM   = 2
  61 };
  62
  63 enum action {
  64         ACTION_UPDATE  = 0,
  65         ACTION_FRIENDS = 1,
  66         ACTION_USER    = 2,
  67         ACTION_REPLIES = 4,
  68         ACTION_PUBLIC  = 8,
  69         ACTION_GROUP   = 16,
  70         ACTION_UNKNOWN = 32
  71 };
  72
  73 struct session {
  74         char *password;
  75         char *account;
  76         char *tweet;
  77         char *proxy;
  78         char *time;
  79         char *homedir;
  80         char *logfile;
  81         char *user;
  82         char *group;
  83         char *hosturl;
  84         char *hostname;
  85         char *configfile;
  86         char *replyto;
  87         int bash;
  88         int interactive;
  89         int shrink_urls;
  90         int dry_run;
  91         int page;
  92         enum host host;
  93         enum action action;
  94         void *readline_handle;
  95         char *(*readline)(const char *);
  96 };
  97
  98 struct bti_curl_buffer {
  99         char *data;
 100         enum action action;
 101         int length;
 102 };
 103
 104 static void display_help(void)
 105 {
 106         fprintf(stdout, "bti - send tweet to twitter or identi.ca\n");
 107         fprintf(stdout, "Version: " VERSION "\n");
 108         fprintf(stdout, "Usage:\n");
 109         fprintf(stdout, "  bti [options]\n");
 110         fprintf(stdout, "options are:\n");
 111         fprintf(stdout, "  --account accountname\n");
 112         fprintf(stdout, "  --password password\n");
 113         fprintf(stdout, "  --action action\n");
 114         fprintf(stdout, "    ('update', 'friends', 'public', 'replies', "
 115                 "'group' or 'user')\n");
 116         fprintf(stdout, "  --user screenname\n");
 117         fprintf(stdout, "  --group groupname\n");
 118         fprintf(stdout, "  --proxy PROXY:PORT\n");
 119         fprintf(stdout, "  --host HOST\n");
 120         fprintf(stdout, "  --logfile logfile\n");
 121         fprintf(stdout, "  --config configfile\n");
 122         fprintf(stdout, "  --replyto ID\n");
 123         fprintf(stdout, "  --shrink-urls\n");
 124         fprintf(stdout, "  --page PAGENUMBER\n");
 125         fprintf(stdout, "  --bash\n");
 126         fprintf(stdout, "  --debug\n");
 127         fprintf(stdout, "  --verbose\n");
 128         fprintf(stdout, "  --dry-run\n");
 129         fprintf(stdout, "  --version\n");
 130         fprintf(stdout, "  --help\n");
 131 }
 132
 133 static void display_version(void)
 134 {
 135         fprintf(stdout, "bti - version %s\n", VERSION);
 136 }
 137
 138 static char *get_string(const char *name)
 139 {
 140         char *temp;
 141         char *string;
 142
 143         string = zalloc(1000);
 144         if (!string)
 145                 exit(1);
 146         if (name != NULL)
 147                 fprintf(stdout, "%s", name);
 148         if (!fgets(string, 999, stdin))
 149                 return NULL;
 150         temp = strchr(string, '\n');
 151         if (temp)
 152                 *temp = '\0';
 153         return string;
 154 }
 155
 156 /*
 157  * Try to get a handle to a readline function from a variety of different
 158  * libraries.  If nothing is present on the system, then fall back to an
 159  * internal one.
 160  *
 161  * Logic originally based off of code in the e2fsutils package in the
 162  * lib/ss/get_readline.c file, which is licensed under the MIT license.
 163  *
 164  * This keeps us from having to relicense the bti codebase if readline
 165  * ever changes its license, as there is no link-time dependancy.
 166  * It is a run-time thing only, and we handle any readline-like library
 167  * in the same manner, making bti not be a derivative work of any
 168  * other program.
 169  */
 170 static void session_readline_init(struct session *session)
 171 {
 172         /* Libraries we will try to use for readline/editline functionality */
 173         const char *libpath = "libreadline.so.6:libreadline.so.5:"
 174                                 "libreadline.so.4:libreadline.so:libedit.so.2:"
 175                                 "libedit.so:libeditline.so.0:libeditline.so";
 176         void *handle = NULL;
 177         char *tmp, *cp, *next;
 178         int (*bind_key)(int, void *);
 179         void (*insert)(void);
 180
 181         /* default to internal function if we can't or won't find anything */
 182         session->readline = get_string;
 183         if (!isatty(0))
 184                 return;
 185         session->interactive = 1;
 186
 187         tmp = malloc(strlen(libpath)+1);
 188         if (!tmp)
 189                 return;
 190         strcpy(tmp, libpath);
 191         for (cp = tmp; cp; cp = next) {
 192                 next = strchr(cp, ':');
 193                 if (next)
 194                         *next++ = 0;
 195                 if (*cp == 0)
 196                         continue;
 197                 handle = dlopen(cp, RTLD_NOW);
 198                 if (handle) {
 199                         dbg("Using %s for readline library\n", cp);
 200                         break;
 201                 }
 202         }
 203         free(tmp);
 204         if (!handle) {
 205                 dbg("No readline library found.\n");
 206                 return;
 207         }
 208
 209         session->readline_handle = handle;
 210         session->readline = (char *(*)(const char *))dlsym(handle, "readline");
 211         if (session->readline == NULL) {
 212                 /* something odd happened, default back to internal stuff */
 213                 session->readline_handle = NULL;
 214                 session->readline = get_string;
 215                 return;
 216         }
 217
 218         /*
 219          * If we found a library, turn off filename expansion
 220          * as that makes no sense from within bti.
 221          */
 222         bind_key = (int (*)(int, void *))dlsym(handle, "rl_bind_key");
 223         insert = (void (*)(void))dlsym(handle, "rl_insert");
 224         if (bind_key && insert)
 225                 bind_key('\t', insert);
 226 }
 227
 228 static void session_readline_cleanup(struct session *session)
 229 {
 230         if (session->readline_handle)
 231                 dlclose(session->readline_handle);
 232 }
 233
 234 static struct session *session_alloc(void)
 235 {
 236         struct session *session;
 237
 238         session = zalloc(sizeof(*session));
 239         if (!session)
 240                 return NULL;
 241         return session;
 242 }
 243
 244 static void session_free(struct session *session)
 245 {
 246         if (!session)
 247                 return;
 248         free(session->replyto);
 249         free(session->password);
 250         free(session->account);
 251         free(session->tweet);
 252         free(session->proxy);
 253         free(session->time);
 254         free(session->homedir);
 255         free(session->user);
 256         free(session->group);
 257         free(session->hosturl);
 258         free(session->hostname);
 259         free(session->configfile);
 260         free(session);
 261 }
 262
 263 static struct bti_curl_buffer *bti_curl_buffer_alloc(enum action action)
 264 {
 265         struct bti_curl_buffer *buffer;
 266
 267         buffer = zalloc(sizeof(*buffer));
 268         if (!buffer)
 269                 return NULL;
 270
 271         /* start out with a data buffer of 1 byte to
 272          * make the buffer fill logic simpler */
 273         buffer->data = zalloc(1);
 274         if (!buffer->data) {
 275                 free(buffer);
 276                 return NULL;
 277         }
 278         buffer->length = 0;
 279         buffer->action = action;
 280         return buffer;
 281 }
 282
 283 static void bti_curl_buffer_free(struct bti_curl_buffer *buffer)
 284 {
 285         if (!buffer)
 286                 return;
 287         free(buffer->data);
 288         free(buffer);
 289 }
 290
 291 static const char *twitter_host  = "https://twitter.com/statuses";
 292 static const char *identica_host = "https://identi.ca/api/statuses";
 293 static const char *twitter_name  = "twitter";
 294 static const char *identica_name = "identi.ca";
 295
 296 static const char *user_uri    = "/user_timeline/";
 297 static const char *update_uri  = "/update.xml";
 298 static const char *public_uri  = "/public_timeline.xml";
 299 static const char *friends_uri = "/friends_timeline.xml";
 300 static const char *replies_uri = "/replies.xml";
 301 static const char *group_uri = "/../laconica/groups/timeline/";
 302
 303 static CURL *curl_init(void)
 304 {
 305         CURL *curl;
 306
 307         curl = curl_easy_init();
 308         if (!curl) {
 309                 fprintf(stderr, "Can not init CURL!\n");
 310                 return NULL;
 311         }
 312         /* some ssl sanity checks on the connection we are making */
 313         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0);
 314         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0);
 315         return curl;
 316 }
 317
 318 static void parse_statuses(xmlDocPtr doc, xmlNodePtr current)
 319 {
 320         xmlChar *text = NULL;
 321         xmlChar *user = NULL;
 322         xmlChar *created = NULL;
 323         xmlChar *id = NULL;
 324         xmlNodePtr userinfo;
 325
 326         current = current->xmlChildrenNode;
 327         while (current != NULL) {
 328                 if (current->type == XML_ELEMENT_NODE) {
 329                         if (!xmlStrcmp(current->name, (const xmlChar *)"created_at"))
 330                                 created = xmlNodeListGetString(doc, current->xmlChildrenNode, 1);
 331                         if (!xmlStrcmp(current->name, (const xmlChar *)"text"))
 332                                 text = xmlNodeListGetString(doc, current->xmlChildrenNode, 1);
 333                         if (!xmlStrcmp(current->name, (const xmlChar *)"id"))
 334                                 id = xmlNodeListGetString(doc, current->xmlChildrenNode, 1);
 335                         if (!xmlStrcmp(current->name, (const xmlChar *)"user")) {
 336                                 userinfo = current->xmlChildrenNode;
 337                                 while (userinfo != NULL) {
 338                                         if ((!xmlStrcmp(userinfo->name, (const xmlChar *)"screen_name"))) {
 339                                                 if (user)
 340                                                         xmlFree(user);
 341                                                 user = xmlNodeListGetString(doc, userinfo->xmlChildrenNode, 1);
 342                                         }
 343                                         userinfo = userinfo->next;
 344                                 }
 345                         }
 346
 347                         if (user && text && created && id) {
 348                                 if (verbose)
 349                                         printf("[%s] {%s} (%.16s) %s\n",
 350                                                 user, id, created, text);
 351                                 else
 352                                         printf("[%s] %s\n",
 353                                                 user, text);
 354                                 xmlFree(user);
 355                                 xmlFree(text);
 356                                 xmlFree(created);
 357                                 xmlFree(id);
 358                                 user = NULL;
 359                                 text = NULL;
 360                                 created = NULL;
 361                                 id = NULL;
 362                         }
 363                 }
 364                 current = current->next;
 365         }
 366
 367         return;
 368 }
 369
 370 static void parse_timeline(char *document)
 371 {
 372         xmlDocPtr doc;
 373         xmlNodePtr current;
 374
 375         doc = xmlReadMemory(document, strlen(document), "timeline.xml",
 376                             NULL, XML_PARSE_NOERROR);
 377         if (doc == NULL)
 378                 return;
 379
 380         current = xmlDocGetRootElement(doc);
 381         if (current == NULL) {
 382                 fprintf(stderr, "empty document\n");
 383                 xmlFreeDoc(doc);
 384                 return;
 385         }
 386
 387         if (xmlStrcmp(current->name, (const xmlChar *) "statuses")) {
 388                 fprintf(stderr, "unexpected document type\n");
 389                 xmlFreeDoc(doc);
 390                 return;
 391         }
 392
 393         current = current->xmlChildrenNode;
 394         while (current != NULL) {
 395                 if ((!xmlStrcmp(current->name, (const xmlChar *)"status")))
 396                         parse_statuses(doc, current);
 397                 current = current->next;
 398         }
 399         xmlFreeDoc(doc);
 400
 401         return;
 402 }
 403
 404 static size_t curl_callback(void *buffer, size_t size, size_t nmemb,
 405                             void *userp)
 406 {
 407         struct bti_curl_buffer *curl_buf = userp;
 408         size_t buffer_size = size * nmemb;
 409         char *temp;
 410
 411         if ((!buffer) || (!buffer_size) || (!curl_buf))
 412                 return -EINVAL;
 413
 414         /* add to the data we already have */
 415         temp = zalloc(curl_buf->length + buffer_size + 1);
 416         if (!temp)
 417                 return -ENOMEM;
 418
 419         memcpy(temp, curl_buf->data, curl_buf->length);
 420         free(curl_buf->data);
 421         curl_buf->data = temp;
 422         memcpy(&curl_buf->data[curl_buf->length], (char *)buffer, buffer_size);
 423         curl_buf->length += buffer_size;
 424         if (curl_buf->action)
 425                 parse_timeline(curl_buf->data);
 426
 427         dbg("%s\n", curl_buf->data);
 428
 429         return buffer_size;
 430 }
 431
 432 static int send_request(struct session *session)
 433 {
 434         char endpoint[100];
 435         char user_password[500];
 436         char data[500];
 437         struct bti_curl_buffer *curl_buf;
 438         CURL *curl = NULL;
 439         CURLcode res;
 440         struct curl_httppost *formpost = NULL;
 441         struct curl_httppost *lastptr = NULL;
 442         struct curl_slist *slist = NULL;
 443
 444         if (!session)
 445                 return -EINVAL;
 446
 447         curl_buf = bti_curl_buffer_alloc(session->action);
 448         if (!curl_buf)
 449                 return -ENOMEM;
 450
 451         curl = curl_init();
 452         if (!curl)
 453                 return -EINVAL;
 454
 455         if (!session->hosturl)
 456                 session->hosturl = strdup(twitter_host);
 457
 458         switch (session->action) {
 459         case ACTION_UPDATE:
 460                 snprintf(user_password, sizeof(user_password), "%s:%s",
 461                          session->account, session->password);
 462                 snprintf(data, sizeof(data), "status=\"%s\"", session->tweet);
 463                 curl_formadd(&formpost, &lastptr,
 464                              CURLFORM_COPYNAME, "status",
 465                              CURLFORM_COPYCONTENTS, session->tweet,
 466                              CURLFORM_END);
 467
 468                 curl_formadd(&formpost, &lastptr,
 469                              CURLFORM_COPYNAME, "source",
 470                              CURLFORM_COPYCONTENTS, "bti",
 471                              CURLFORM_END);
 472
 473                 if (session->replyto)
 474                         curl_formadd(&formpost, &lastptr,
 475                                      CURLFORM_COPYNAME, "in_reply_to_status_id",
 476                                      CURLFORM_COPYCONTENTS, session->replyto,
 477                                      CURLFORM_END);
 478
 479                 curl_easy_setopt(curl, CURLOPT_HTTPPOST, formpost);
 480                 slist = curl_slist_append(slist, "Expect:");
 481                 curl_easy_setopt(curl, CURLOPT_HTTPHEADER, slist);
 482
 483                 sprintf(endpoint, "%s%s", session->hosturl, update_uri);
 484                 curl_easy_setopt(curl, CURLOPT_URL, endpoint);
 485                 curl_easy_setopt(curl, CURLOPT_USERPWD, user_password);
 486
 487                 break;
 488         case ACTION_FRIENDS:
 489                 snprintf(user_password, sizeof(user_password), "%s:%s",
 490                          session->account, session->password);
 491                 sprintf(endpoint, "%s%s?page=%d", session->hosturl,
 492                         friends_uri, session->page);
 493                 curl_easy_setopt(curl, CURLOPT_URL, endpoint);
 494                 curl_easy_setopt(curl, CURLOPT_USERPWD, user_password);
 495
 496                 break;
 497         case ACTION_USER:
 498                 sprintf(endpoint, "%s%s%s.xml?page=%d", session->hosturl,
 499                         user_uri, session->user, session->page);
 500                 curl_easy_setopt(curl, CURLOPT_URL, endpoint);
 501
 502                 break;
 503         case ACTION_REPLIES:
 504                 snprintf(user_password, sizeof(user_password), "%s:%s",
 505                          session->account, session->password);
 506                 sprintf(endpoint, "%s%s?page=%d", session->hosturl, replies_uri,
 507                         session->page);
 508                 curl_easy_setopt(curl, CURLOPT_URL, endpoint);
 509                 curl_easy_setopt(curl, CURLOPT_USERPWD, user_password);
 510
 511                 break;
 512         case ACTION_PUBLIC:
 513                 sprintf(endpoint, "%s%s?page=%d", session->hosturl, public_uri,
 514                         session->page);
 515                 curl_easy_setopt(curl, CURLOPT_URL, endpoint);
 516
 517                 break;
 518         case ACTION_GROUP:
 519                 sprintf(endpoint, "%s%s%s.xml?page=%d", session->hosturl,
 520                                 group_uri, session->group, session->page);
 521                 curl_easy_setopt(curl, CURLOPT_URL, endpoint);
 522
 523                 break;
 524         default:
 525                 break;
 526         }
 527
 528         if (session->proxy)
 529                 curl_easy_setopt(curl, CURLOPT_PROXY, session->proxy);
 530
 531         if (debug)
 532                 curl_easy_setopt(curl, CURLOPT_VERBOSE, 1);
 533
 534         dbg("user_password = %s\n", user_password);
 535         dbg("data = %s\n", data);
 536         dbg("proxy = %s\n", session->proxy);
 537
 538         curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, curl_callback);
 539         curl_easy_setopt(curl, CURLOPT_WRITEDATA, curl_buf);
 540         if (!session->dry_run) {
 541                 res = curl_easy_perform(curl);
 542                 if (res && !session->bash) {
 543                         fprintf(stderr, "error(%d) trying to perform "
 544                                 "operation\n", res);
 545                         return -EINVAL;
 546                 }
 547         }
 548
 549         curl_easy_cleanup(curl);
 550         if (session->action == ACTION_UPDATE)
 551                 curl_formfree(formpost);
 552         bti_curl_buffer_free(curl_buf);
 553         return 0;
 554 }
 555
 556 static void parse_configfile(struct session *session)
 557 {
 558         FILE *config_file;
 559         char *line = NULL;
 560         size_t len = 0;
 561         char *account = NULL;
 562         char *password = NULL;
 563         char *host = NULL;
 564         char *proxy = NULL;
 565         char *logfile = NULL;
 566         char *action = NULL;
 567         char *user = NULL;
 568         char *file;
 569         int shrink_urls = 0;
 570
 571         config_file = fopen(session->configfile, "r");
 572
 573         /* No error if file does not exist or is unreadable.  */
 574         if (config_file == NULL)
 575                 return;
 576
 577         do {
 578                 ssize_t n = getline(&line, &len, config_file);
 579                 if (n < 0)
 580                         break;
 581                 if (line[n - 1] == '\n')
 582                         line[n - 1] = '\0';
 583                 /* Parse file.  Format is the usual value pairs:
 584                    account=name
 585                    passwort=value
 586                    # is a comment character
 587                 */
 588                 *strchrnul(line, '#') = '\0';
 589                 char *c = line;
 590                 while (isspace(*c))
 591                         c++;
 592                 /* Ignore blank lines.  */
 593                 if (c[0] == '\0')
 594                         continue;
 595
 596                 if (!strncasecmp(c, "account", 7) && (c[7] == '=')) {
 597                         c += 8;
 598                         if (c[0] != '\0')
 599                                 account = strdup(c);
 600                 } else if (!strncasecmp(c, "password", 8) &&
 601                            (c[8] == '=')) {
 602                         c += 9;
 603                         if (c[0] != '\0')
 604                                 password = strdup(c);
 605                 } else if (!strncasecmp(c, "host", 4) &&
 606                            (c[4] == '=')) {
 607                         c += 5;
 608                         if (c[0] != '\0')
 609                                 host = strdup(c);
 610                 } else if (!strncasecmp(c, "proxy", 5) &&
 611                            (c[5] == '=')) {
 612                         c += 6;
 613                         if (c[0] != '\0')
 614                                 proxy = strdup(c);
 615                 } else if (!strncasecmp(c, "logfile", 7) &&
 616                            (c[7] == '=')) {
 617                         c += 8;
 618                         if (c[0] != '\0')
 619                                 logfile = strdup(c);
 620                 } else if (!strncasecmp(c, "action", 6) &&
 621                            (c[6] == '=')) {
 622                         c += 7;
 623                         if (c[0] != '\0')
 624                                 action = strdup(c);
 625                 } else if (!strncasecmp(c, "user", 4) &&
 626                                 (c[4] == '=')) {
 627                         c += 5;
 628                         if (c[0] != '\0')
 629                                 user = strdup(c);
 630                 } else if (!strncasecmp(c, "shrink-urls", 11) &&
 631                                 (c[11] == '=')) {
 632                         c += 12;
 633                         if (!strncasecmp(c, "true", 4) ||
 634                                         !strncasecmp(c, "yes", 3))
 635                                 shrink_urls = 1;
 636                 } else if (!strncasecmp(c, "verbose", 7) &&
 637                                 (c[7] == '=')) {
 638                         c += 8;
 639                         if (!strncasecmp(c, "true", 4) ||
 640                                         !strncasecmp(c, "yes", 3))
 641                                 verbose = 1;
 642                 }
 643         } while (!feof(config_file));
 644
 645         if (password)
 646                 session->password = password;
 647         if (account)
 648                 session->account = account;
 649         if (host) {
 650                 if (strcasecmp(host, "twitter") == 0) {
 651                         session->host = HOST_TWITTER;
 652                         session->hosturl = strdup(twitter_host);
 653                         session->hostname = strdup(twitter_name);
 654                 } else if (strcasecmp(host, "identica") == 0) {
 655                         session->host = HOST_IDENTICA;
 656                         session->hosturl = strdup(identica_host);
 657                         session->hostname = strdup(identica_name);
 658                 } else {
 659                         session->host = HOST_CUSTOM;
 660                         session->hosturl = strdup(host);
 661                         session->hostname = strdup(host);
 662                 }
 663                 free(host);
 664         }
 665         if (proxy) {
 666                 if (session->proxy)
 667                         free(session->proxy);
 668                 session->proxy = proxy;
 669         }
 670         if (logfile)
 671                 session->logfile = logfile;
 672         if (action) {
 673                 if (strcasecmp(action, "update") == 0)
 674                         session->action = ACTION_UPDATE;
 675                 else if (strcasecmp(action, "friends") == 0)
 676                         session->action = ACTION_FRIENDS;
 677                 else if (strcasecmp(action, "user") == 0)
 678                         session->action = ACTION_USER;
 679                 else if (strcasecmp(action, "replies") == 0)
 680                         session->action = ACTION_REPLIES;
 681                 else if (strcasecmp(action, "public") == 0)
 682                         session->action = ACTION_PUBLIC;
 683                 else if (strcasecmp(action, "group") == 0)
 684                         session->action = ACTION_GROUP;
 685                 else
 686                         session->action = ACTION_UNKNOWN;
 687                 free(action);
 688         }
 689         if (user)
 690                 session->user = user;
 691         session->shrink_urls = shrink_urls;
 692
 693         /* Free buffer and close file.  */
 694         free(line);
 695         fclose(config_file);
 696 }
 697
 698 static void log_session(struct session *session, int retval)
 699 {
 700         FILE *log_file;
 701         char *filename;
 702
 703         /* Only log something if we have a log file set */
 704         if (!session->logfile)
 705                 return;
 706
 707         filename = alloca(strlen(session->homedir) +
 708                           strlen(session->logfile) + 3);
 709
 710         sprintf(filename, "%s/%s", session->homedir, session->logfile);
 711
 712         log_file = fopen(filename, "a+");
 713         if (log_file == NULL)
 714                 return;
 715
 716         switch (session->action) {
 717         case ACTION_UPDATE:
 718                 if (retval)
 719                         fprintf(log_file, "%s: host=%s tweet failed\n",
 720                                 session->time, session->hostname);
 721                 else
 722                         fprintf(log_file, "%s: host=%s tweet=%s\n",
 723                                 session->time, session->hostname,
 724                                 session->tweet);
 725                 break;
 726         case ACTION_FRIENDS:
 727                 fprintf(log_file, "%s: host=%s retrieving friends timeline\n",
 728                         session->time, session->hostname);
 729                 break;
 730         case ACTION_USER:
 731                 fprintf(log_file, "%s: host=%s retrieving %s's timeline\n",
 732                         session->time, session->hostname, session->user);
 733                 break;
 734         case ACTION_REPLIES:
 735                 fprintf(log_file, "%s: host=%s retrieving replies\n",
 736                         session->time, session->hostname);
 737                 break;
 738         case ACTION_PUBLIC:
 739                 fprintf(log_file, "%s: host=%s retrieving public timeline\n",
 740                         session->time, session->hostname);
 741                 break;
 742         case ACTION_GROUP:
 743                 fprintf(log_file, "%s: host=%s retrieving group timeline\n",
 744                         session->time, session->hostname);
 745                 break;
 746         default:
 747                 break;
 748         }
 749
 750         fclose(log_file);
 751 }
 752
 753 static char *get_string_from_stdin(void)
 754 {
 755         char *temp;
 756         char *string;
 757
 758         string = zalloc(1000);
 759         if (!string)
 760                 return NULL;
 761
 762         if (!fgets(string, 999, stdin))
 763                 return NULL;
 764         temp = strchr(string, '\n');
 765         if (temp)
 766                 *temp = '\0';
 767         return string;
 768 }
 769
 770 static void read_password(char *buf, size_t len, char *host)
 771 {
 772         char pwd[80];
 773         int retval;
 774         struct termios old;
 775         struct termios tp;
 776
 777         tcgetattr(0, &tp);
 778         old = tp;
 779
 780         tp.c_lflag &= (~ECHO);
 781         tcsetattr(0, TCSANOW, &tp);
 782
 783         fprintf(stdout, "Enter password for %s: ", host);
 784         fflush(stdout);
 785         tcflow(0, TCOOFF);
 786         retval = scanf("%79s", pwd);
 787         tcflow(0, TCOON);
 788         fprintf(stdout, "\n");
 789
 790         tcsetattr(0, TCSANOW, &old);
 791
 792         strncpy(buf, pwd, len);
 793         buf[len-1] = '\0';
 794 }
 795
 796 static int find_urls(const char *tweet, int **pranges)
 797 {
 798         /*
 799          * magic obtained from
 800          * http://www.geekpedia.com/KB65_How-to-validate-an-URL-using-RegEx-in-Csharp.html
 801          */
 802         static const char *re_magic =
 803                 "(([a-zA-Z][0-9a-zA-Z+\\-\\.]*:)/{1,3}"
 804                 "[0-9a-zA-Z;/~?:@&=+$\\.\\-_'()%]+)"
 805                 "(#[0-9a-zA-Z;/?:@&=+$\\.\\-_!~*'()%]+)?";
 806         pcre *re;
 807         const char *errptr;
 808         int erroffset;
 809         int ovector[10] = {0,};
 810         const size_t ovsize = sizeof(ovector)/sizeof(*ovector);
 811         int startoffset, tweetlen;
 812         int i, rc;
 813         int rbound = 10;
 814         int rcount = 0;
 815         int *ranges = malloc(sizeof(int) * rbound);
 816
 817         re = pcre_compile(re_magic,
 818                         PCRE_NO_AUTO_CAPTURE,
 819                         &errptr, &erroffset, NULL);
 820         if (!re) {
 821                 fprintf(stderr, "pcre_compile @%u: %s\n", erroffset, errptr);
 822                 exit(1);
 823         }
 824
 825         tweetlen = strlen(tweet);
 826         for (startoffset = 0; startoffset < tweetlen; ) {
 827
 828                 rc = pcre_exec(re, NULL, tweet, strlen(tweet), startoffset, 0,
 829                                 ovector, ovsize);
 830                 if (rc == PCRE_ERROR_NOMATCH)
 831                         break;
 832
 833                 if (rc < 0) {
 834                         fprintf(stderr, "pcre_exec @%u: %s\n",
 835                                 erroffset, errptr);
 836                         exit(1);
 837                 }
 838
 839                 for (i = 0; i < rc; i += 2) {
 840                         if ((rcount+2) == rbound) {
 841                                 rbound *= 2;
 842                                 ranges = realloc(ranges, sizeof(int) * rbound);
 843                         }
 844
 845                         ranges[rcount++] = ovector[i];
 846                         ranges[rcount++] = ovector[i+1];
 847                 }
 848
 849                 startoffset = ovector[1];
 850         }
 851
 852         pcre_free(re);
 853
 854         *pranges = ranges;
 855         return rcount;
 856 }
 857
 858 /**
 859  * bidirectional popen() call
 860  *
 861  * @param rwepipe - int array of size three
 862  * @param exe - program to run
 863  * @param argv - argument list
 864  * @return pid or -1 on error
 865  *
 866  * The caller passes in an array of three integers (rwepipe), on successful
 867  * execution it can then write to element 0 (stdin of exe), and read from
 868  * element 1 (stdout) and 2 (stderr).
 869  */
 870 static int popenRWE(int *rwepipe, const char *exe, const char *const argv[])
 871 {
 872         int in[2];
 873         int out[2];
 874         int err[2];
 875         int pid;
 876         int rc;
 877
 878         rc = pipe(in);
 879         if (rc < 0)
 880                 goto error_in;
 881
 882         rc = pipe(out);
 883         if (rc < 0)
 884                 goto error_out;
 885
 886         rc = pipe(err);
 887         if (rc < 0)
 888                 goto error_err;
 889
 890         pid = fork();
 891         if (pid > 0) {
 892                 /* parent */
 893                 close(in[0]);
 894                 close(out[1]);
 895                 close(err[1]);
 896                 rwepipe[0] = in[1];
 897                 rwepipe[1] = out[0];
 898                 rwepipe[2] = err[0];
 899                 return pid;
 900         } else if (pid == 0) {
 901                 /* child */
 902                 close(in[1]);
 903                 close(out[0]);
 904                 close(err[0]);
 905                 close(0);
 906                 rc = dup(in[0]);
 907                 close(1);
 908                 rc = dup(out[1]);
 909                 close(2);
 910                 rc = dup(err[1]);
 911
 912                 execvp(exe, (char **)argv);
 913                 exit(1);
 914         } else
 915                 goto error_fork;
 916
 917         return pid;
 918
 919 error_fork:
 920         close(err[0]);
 921         close(err[1]);
 922 error_err:
 923         close(out[0]);
 924         close(out[1]);
 925 error_out:
 926         close(in[0]);
 927         close(in[1]);
 928 error_in:
 929         return -1;
 930 }
 931
 932 static int pcloseRWE(int pid, int *rwepipe)
 933 {
 934         int rc, status;
 935         close(rwepipe[0]);
 936         close(rwepipe[1]);
 937         close(rwepipe[2]);
 938         rc = waitpid(pid, &status, 0);
 939         return status;
 940 }
 941
 942 static char *shrink_one_url(int *rwepipe, char *big)
 943 {
 944         int biglen = strlen(big);
 945         char *small;
 946         int smalllen;
 947         int rc;
 948
 949         rc = dprintf(rwepipe[0], "%s\n", big);
 950         if (rc < 0)
 951                 return big;
 952
 953         smalllen = biglen + 128;
 954         small = malloc(smalllen);
 955         if (!small)
 956                 return big;
 957
 958         rc = read(rwepipe[1], small, smalllen);
 959         if (rc < 0 || rc > biglen)
 960                 goto error_free_small;
 961
 962         if (strncmp(small, "http://", 7))
 963                 goto error_free_small;
 964
 965         smalllen = rc;
 966         while (smalllen && isspace(small[smalllen-1]))
 967                         small[--smalllen] = 0;
 968
 969         free(big);
 970         return small;
 971
 972 error_free_small:
 973         free(small);
 974         return big;
 975 }
 976
 977 static char *shrink_urls(char *text)
 978 {
 979         int *ranges;
 980         int rcount;
 981         int i;
 982         int inofs = 0;
 983         int outofs = 0;
 984         const char *const shrink_args[] = {
 985                 "bti-shrink-urls",
 986                 NULL
 987         };
 988         int shrink_pid;
 989         int shrink_pipe[3];
 990         int inlen = strlen(text);
 991
 992         dbg("before len=%u\n", inlen);
 993
 994         shrink_pid = popenRWE(shrink_pipe, shrink_args[0], shrink_args);
 995         if (shrink_pid < 0)
 996                 return text;
 997
 998         rcount = find_urls(text, &ranges);
 999         if (!rcount)
1000                 return text;
1001
1002         for (i = 0; i < rcount; i += 2) {
1003                 int url_start = ranges[i];
1004                 int url_end = ranges[i+1];
1005                 int long_url_len = url_end - url_start;
1006                 char *url = strndup(text + url_start, long_url_len);
1007                 int short_url_len;
1008                 int not_url_len = url_start - inofs;
1009
1010                 dbg("long  url[%u]: %s\n", long_url_len, url);
1011                 url = shrink_one_url(shrink_pipe, url);
1012                 short_url_len = url ? strlen(url) : 0;
1013                 dbg("short url[%u]: %s\n", short_url_len, url);
1014
1015                 if (!url || short_url_len >= long_url_len) {
1016                         /* The short url ended up being too long
1017                          * or unavailable */
1018                         if (inofs) {
1019                                 strncpy(text + outofs, text + inofs,
1020                                                 not_url_len + long_url_len);
1021                         }
1022                         inofs += not_url_len + long_url_len;
1023                         outofs += not_url_len + long_url_len;
1024
1025                 } else {
1026                         /* copy the unmodified block */
1027                         strncpy(text + outofs, text + inofs, not_url_len);
1028                         inofs += not_url_len;
1029                         outofs += not_url_len;
1030
1031                         /* copy the new url */
1032                         strncpy(text + outofs, url, short_url_len);
1033                         inofs += long_url_len;
1034                         outofs += short_url_len;
1035                 }
1036
1037                 free(url);
1038         }
1039
1040         /* copy the last block after the last match */
1041         if (inofs) {
1042                 int tail = inlen - inofs;
1043                 if (tail) {
1044                         strncpy(text + outofs, text + inofs, tail);
1045                         outofs += tail;
1046                 }
1047         }
1048
1049         free(ranges);
1050
1051         (void)pcloseRWE(shrink_pid, shrink_pipe);
1052
1053         text[outofs] = 0;
1054         dbg("after len=%u\n", outofs);
1055         return text;
1056 }
1057
1058 int main(int argc, char *argv[], char *envp[])
1059 {
1060         static const struct option options[] = {
1061                 { "debug", 0, NULL, 'd' },
1062                 { "verbose", 0, NULL, 'V' },
1063                 { "account", 1, NULL, 'a' },
1064                 { "password", 1, NULL, 'p' },
1065                 { "host", 1, NULL, 'H' },
1066                 { "proxy", 1, NULL, 'P' },
1067                 { "action", 1, NULL, 'A' },
1068                 { "user", 1, NULL, 'u' },
1069                 { "group", 1, NULL, 'G' },
1070                 { "logfile", 1, NULL, 'L' },
1071                 { "shrink-urls", 0, NULL, 's' },
1072                 { "help", 0, NULL, 'h' },
1073                 { "bash", 0, NULL, 'b' },
1074                 { "dry-run", 0, NULL, 'n' },
1075                 { "page", 1, NULL, 'g' },
1076                 { "version", 0, NULL, 'v' },
1077                 { "config", 1, NULL, 'c' },
1078                 { "replyto", 1, NULL, 'r' },
1079                 { }
1080         };
1081         struct session *session;
1082         pid_t child;
1083         char *tweet;
1084         static char password[80];
1085         int retval = 0;
1086         int option;
1087         char *http_proxy;
1088         time_t t;
1089         int page_nr;
1090
1091         debug = 0;
1092         verbose = 0;
1093
1094         session = session_alloc();
1095         if (!session) {
1096                 fprintf(stderr, "no more memory...\n");
1097                 return -1;
1098         }
1099
1100         /* get the current time so that we can log it later */
1101         time(&t);
1102         session->time = strdup(ctime(&t));
1103         session->time[strlen(session->time)-1] = 0x00;
1104
1105         /* Get the home directory so we can try to find a config file */
1106         session->homedir = strdup(getenv("HOME"));
1107
1108         /* set up a default config file location (traditionally ~/.bti) */
1109         session->configfile = zalloc(strlen(session->homedir) + 7);
1110         sprintf(session->configfile, "%s/.bti", session->homedir);
1111
1112         curl_global_init(CURL_GLOBAL_ALL);
1113
1114         /* Set environment variables first, before reading command line options
1115          * or config file values. */
1116         http_proxy = getenv("http_proxy");
1117         if (http_proxy) {
1118                 if (session->proxy)
1119                         free(session->proxy);
1120                 session->proxy = strdup(http_proxy);
1121                 dbg("http_proxy = %s\n", session->proxy);
1122         }
1123
1124         parse_configfile(session);
1125
1126         while (1) {
1127                 option = getopt_long_only(argc, argv, "dp:P:H:a:A:u:c:hg:G:sr:nVv",
1128                                           options, NULL);
1129                 if (option == -1)
1130                         break;
1131                 switch (option) {
1132                 case 'd':
1133                         debug = 1;
1134                         break;
1135                 case 'V':
1136                         verbose = 1;
1137                         break;
1138                 case 'a':
1139                         if (session->account)
1140                                 free(session->account);
1141                         session->account = strdup(optarg);
1142                         dbg("account = %s\n", session->account);
1143                         break;
1144                 case 'g':
1145                         page_nr = atoi(optarg);
1146                         dbg("page = %d\n", page_nr);
1147                         session->page = page_nr;
1148                         break;
1149                 case 'r':
1150                         session->replyto = strdup(optarg);
1151                         dbg("in_reply_to_status_id = %s\n", session->replyto);
1152                         break;
1153                 case 'p':
1154                         if (session->password)
1155                                 free(session->password);
1156                         session->password = strdup(optarg);
1157                         dbg("password = %s\n", session->password);
1158                         break;
1159                 case 'P':
1160                         if (session->proxy)
1161                                 free(session->proxy);
1162                         session->proxy = strdup(optarg);
1163                         dbg("proxy = %s\n", session->proxy);
1164                         break;
1165                 case 'A':
1166                         if (strcasecmp(optarg, "update") == 0)
1167                                 session->action = ACTION_UPDATE;
1168                         else if (strcasecmp(optarg, "friends") == 0)
1169                                 session->action = ACTION_FRIENDS;
1170                         else if (strcasecmp(optarg, "user") == 0)
1171                                 session->action = ACTION_USER;
1172                         else if (strcasecmp(optarg, "replies") == 0)
1173                                 session->action = ACTION_REPLIES;
1174                         else if (strcasecmp(optarg, "public") == 0)
1175                                 session->action = ACTION_PUBLIC;
1176                         else if (strcasecmp(optarg, "group") == 0)
1177                                 session->action = ACTION_GROUP;
1178                         else
1179                                 session->action = ACTION_UNKNOWN;
1180                         dbg("action = %d\n", session->action);
1181                         break;
1182                 case 'u':
1183                         if (session->user)
1184                                 free(session->user);
1185                         session->user = strdup(optarg);
1186                         dbg("user = %s\n", session->user);
1187                         break;
1188
1189                 case 'G':
1190                         if (session->group)
1191                                 free(session->group);
1192                         session->group = strdup(optarg);
1193                         dbg("group = %s\n", session->group);
1194                         break;
1195                 case 'L':
1196                         if (session->logfile)
1197                                 free(session->logfile);
1198                         session->logfile = strdup(optarg);
1199                         dbg("logfile = %s\n", session->logfile);
1200                         break;
1201                 case 's':
1202                         session->shrink_urls = 1;
1203                         break;
1204                 case 'H':
1205                         if (session->hosturl)
1206                                 free(session->hosturl);
1207                         if (session->hostname)
1208                                 free(session->hostname);
1209                         if (strcasecmp(optarg, "twitter") == 0) {
1210                                 session->host = HOST_TWITTER;
1211                                 session->hosturl = strdup(twitter_host);
1212                                 session->hostname = strdup(twitter_name);
1213                         } else if (strcasecmp(optarg, "identica") == 0) {
1214                                 session->host = HOST_IDENTICA;
1215                                 session->hosturl = strdup(identica_host);
1216                                 session->hostname = strdup(identica_name);
1217                         } else {
1218                                 session->host = HOST_CUSTOM;
1219                                 session->hosturl = strdup(optarg);
1220                                 session->hostname = strdup(optarg);
1221                         }
1222                         dbg("host = %d\n", session->host);
1223                         break;
1224                 case 'b':
1225                         session->bash = 1;
1226                         break;
1227                 case 'c':
1228                         if (session->configfile)
1229                                 free(session->configfile);
1230                         session->configfile = strdup(optarg);
1231                         dbg("configfile = %s\n", session->configfile);
1232
1233                         /*
1234                          * read the config file now.  Yes, this could override previously
1235                          * set options from the command line, but the user asked for it...
1236                          */
1237                         parse_configfile(session);
1238                         break;
1239                 case 'h':
1240                         display_help();
1241                         goto exit;
1242                 case 'n':
1243                         session->dry_run = 1;
1244                         break;
1245                 case 'v':
1246                         display_version();
1247                         goto exit;
1248                 default:
1249                         display_help();
1250                         goto exit;
1251                 }
1252         }
1253
1254         session_readline_init(session);
1255         /*
1256          * Show the version to make it easier to determine what
1257          * is going on here
1258          */
1259         if (debug)
1260                 display_version();
1261
1262         if (session->action == ACTION_UNKNOWN) {
1263                 fprintf(stderr, "Unknown action, valid actions are:\n");
1264                 fprintf(stderr, "'update', 'friends', 'public', "
1265                         "'replies', 'group' or 'user'.\n");
1266                 goto exit;
1267         }
1268
1269         if (session->host == HOST_TWITTER && session->action == ACTION_GROUP) {
1270                 fprintf(stderr, "Groups only work in Identi.ca.\n");
1271                 goto exit;
1272         }
1273
1274         if (session->action == ACTION_GROUP && !session->group) {
1275                 fprintf(stdout, "Enter group name: ");
1276                 session->group = session->readline(NULL);
1277         }
1278
1279         if (!session->account) {
1280                 fprintf(stdout, "Enter account for %s: ", session->hostname);
1281                 session->account = session->readline(NULL);
1282         }
1283
1284         if (!session->password) {
1285                 read_password(password, sizeof(password), session->hostname);
1286                 session->password = strdup(password);
1287         }
1288
1289         if (session->action == ACTION_UPDATE) {
1290                 if (session->bash || !session->interactive)
1291                         tweet = get_string_from_stdin();
1292                 else
1293                         tweet = session->readline("tweet: ");
1294                 if (!tweet || strlen(tweet) == 0) {
1295                         dbg("no tweet?\n");
1296                         return -1;
1297                 }
1298
1299                 if (session->shrink_urls)
1300                         tweet = shrink_urls(tweet);
1301
1302                 session->tweet = zalloc(strlen(tweet) + 10);
1303                 if (session->bash)
1304                         sprintf(session->tweet, "%c %s",
1305                                 getuid() ? '$' : '#', tweet);
1306                 else
1307                         sprintf(session->tweet, "%s", tweet);
1308
1309                 free(tweet);
1310                 dbg("tweet = %s\n", session->tweet);
1311         }
1312
1313         if (!session->user)
1314                 session->user = strdup(session->account);
1315
1316         if (session->page == 0)
1317                 session->page = 1;
1318         dbg("config file = %s\n", session->configfile);
1319         dbg("account = %s\n", session->account);
1320         dbg("password = %s\n", session->password);
1321         dbg("host = %d\n", session->host);
1322         dbg("action = %d\n", session->action);
1323
1324         /* fork ourself so that the main shell can get on
1325          * with it's life as we try to connect and handle everything
1326          */
1327         if (session->bash) {
1328                 child = fork();
1329                 if (child) {
1330                         dbg("child is %d\n", child);
1331                         exit(0);
1332                 }
1333         }
1334
1335         retval = send_request(session);
1336         if (retval && !session->bash)
1337                 fprintf(stderr, "operation failed\n");
1338
1339         log_session(session, retval);
1340 exit:
1341         session_readline_cleanup(session);
1342         session_free(session);
1343         return retval;;
1344 }