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