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         xmlChar *id = NULL;
 321         xmlNodePtr userinfo;
 322
 323         current = current->xmlChildrenNode;
 324         while (current != NULL) {
 325                 if (current->type == XML_ELEMENT_NODE) {
 326                         if (!xmlStrcmp(current->name, (const xmlChar *)"created_at"))
 327                                 created = xmlNodeListGetString(doc, current->xmlChildrenNode, 1);
 328                         if (!xmlStrcmp(current->name, (const xmlChar *)"text"))
 329                                 text = xmlNodeListGetString(doc, current->xmlChildrenNode, 1);
 330                         if (!xmlStrcmp(current->name, (const xmlChar *)"id"))
 331                                 id = xmlNodeListGetString(doc, current->xmlChildrenNode, 1);
 332                         if (!xmlStrcmp(current->name, (const xmlChar *)"user")) {
 333                                 userinfo = current->xmlChildrenNode;
 334                                 while (userinfo != NULL) {
 335                                         if ((!xmlStrcmp(userinfo->name, (const xmlChar *)"screen_name"))) {
 336                                                 if (user)
 337                                                         xmlFree(user);
 338                                                 user = xmlNodeListGetString(doc, userinfo->xmlChildrenNode, 1);
 339                                         }
 340                                         userinfo = userinfo->next;
 341                                 }
 342                         }
 343
 344                         if (user && text && created && id) {
 345                                 if (verbose)
 346                                         printf("[%s] {%s} (%.16s) %s\n",
 347                                                 user, id, created, text);
 348                                 else
 349                                         printf("[%s] %s\n",
 350                                                 user, text);
 351                                 xmlFree(user);
 352                                 xmlFree(text);
 353                                 xmlFree(created);
 354                                 xmlFree(id);
 355                                 user = NULL;
 356                                 text = NULL;
 357                                 created = NULL;
 358                                 id = NULL;
 359                         }
 360                 }
 361                 current = current->next;
 362         }
 363
 364         return;
 365 }
 366
 367 static void parse_timeline(char *document)
 368 {
 369         xmlDocPtr doc;
 370         xmlNodePtr current;
 371
 372         doc = xmlReadMemory(document, strlen(document), "timeline.xml",
 373                             NULL, XML_PARSE_NOERROR);
 374         if (doc == NULL)
 375                 return;
 376
 377         current = xmlDocGetRootElement(doc);
 378         if (current == NULL) {
 379                 fprintf(stderr, "empty document\n");
 380                 xmlFreeDoc(doc);
 381                 return;
 382         }
 383
 384         if (xmlStrcmp(current->name, (const xmlChar *) "statuses")) {
 385                 fprintf(stderr, "unexpected document type\n");
 386                 xmlFreeDoc(doc);
 387                 return;
 388         }
 389
 390         current = current->xmlChildrenNode;
 391         while (current != NULL) {
 392                 if ((!xmlStrcmp(current->name, (const xmlChar *)"status")))
 393                         parse_statuses(doc, current);
 394                 current = current->next;
 395         }
 396         xmlFreeDoc(doc);
 397
 398         return;
 399 }
 400
 401 static size_t curl_callback(void *buffer, size_t size, size_t nmemb,
 402                             void *userp)
 403 {
 404         struct bti_curl_buffer *curl_buf = userp;
 405         size_t buffer_size = size * nmemb;
 406         char *temp;
 407
 408         if ((!buffer) || (!buffer_size) || (!curl_buf))
 409                 return -EINVAL;
 410
 411         /* add to the data we already have */
 412         temp = zalloc(curl_buf->length + buffer_size + 1);
 413         if (!temp)
 414                 return -ENOMEM;
 415
 416         memcpy(temp, curl_buf->data, curl_buf->length);
 417         free(curl_buf->data);
 418         curl_buf->data = temp;
 419         memcpy(&curl_buf->data[curl_buf->length], (char *)buffer, buffer_size);
 420         curl_buf->length += buffer_size;
 421         if (curl_buf->action)
 422                 parse_timeline(curl_buf->data);
 423
 424         dbg("%s\n", curl_buf->data);
 425
 426         return buffer_size;
 427 }
 428
 429 static int send_request(struct session *session)
 430 {
 431         char endpoint[100];
 432         char user_password[500];
 433         char data[500];
 434         struct bti_curl_buffer *curl_buf;
 435         CURL *curl = NULL;
 436         CURLcode res;
 437         struct curl_httppost *formpost = NULL;
 438         struct curl_httppost *lastptr = NULL;
 439         struct curl_slist *slist = NULL;
 440
 441         if (!session)
 442                 return -EINVAL;
 443
 444         curl_buf = bti_curl_buffer_alloc(session->action);
 445         if (!curl_buf)
 446                 return -ENOMEM;
 447
 448         curl = curl_init();
 449         if (!curl)
 450                 return -EINVAL;
 451
 452         if (!session->hosturl)
 453                 session->hosturl = strdup(twitter_host);
 454
 455         switch (session->action) {
 456         case ACTION_UPDATE:
 457                 snprintf(user_password, sizeof(user_password), "%s:%s",
 458                          session->account, session->password);
 459                 snprintf(data, sizeof(data), "status=\"%s\"", session->tweet);
 460                 curl_formadd(&formpost, &lastptr,
 461                              CURLFORM_COPYNAME, "status",
 462                              CURLFORM_COPYCONTENTS, session->tweet,
 463                              CURLFORM_END);
 464
 465                 curl_formadd(&formpost, &lastptr,
 466                              CURLFORM_COPYNAME, "source",
 467                              CURLFORM_COPYCONTENTS, "bti",
 468                              CURLFORM_END);
 469
 470                 curl_easy_setopt(curl, CURLOPT_HTTPPOST, formpost);
 471                 slist = curl_slist_append(slist, "Expect:");
 472                 curl_easy_setopt(curl, CURLOPT_HTTPHEADER, slist);
 473
 474                 sprintf(endpoint, "%s%s", session->hosturl, update_uri);
 475                 curl_easy_setopt(curl, CURLOPT_URL, endpoint);
 476                 curl_easy_setopt(curl, CURLOPT_USERPWD, user_password);
 477
 478                 break;
 479         case ACTION_FRIENDS:
 480                 snprintf(user_password, sizeof(user_password), "%s:%s",
 481                          session->account, session->password);
 482                 sprintf(endpoint, "%s%s?page=%d", session->hosturl,
 483                         friends_uri, session->page);
 484                 curl_easy_setopt(curl, CURLOPT_URL, endpoint);
 485                 curl_easy_setopt(curl, CURLOPT_USERPWD, user_password);
 486
 487                 break;
 488         case ACTION_USER:
 489                 sprintf(endpoint, "%s%s%s.xml?page=%d", session->hosturl,
 490                         user_uri, session->user, session->page);
 491                 curl_easy_setopt(curl, CURLOPT_URL, endpoint);
 492
 493                 break;
 494         case ACTION_REPLIES:
 495                 snprintf(user_password, sizeof(user_password), "%s:%s",
 496                          session->account, session->password);
 497                 sprintf(endpoint, "%s%s?page=%d", session->hosturl, replies_uri,
 498                         session->page);
 499                 curl_easy_setopt(curl, CURLOPT_URL, endpoint);
 500                 curl_easy_setopt(curl, CURLOPT_USERPWD, user_password);
 501
 502                 break;
 503         case ACTION_PUBLIC:
 504                 sprintf(endpoint, "%s%s?page=%d", session->hosturl, public_uri,
 505                         session->page);
 506                 curl_easy_setopt(curl, CURLOPT_URL, endpoint);
 507
 508                 break;
 509         case ACTION_GROUP:
 510                 sprintf(endpoint, "%s%s%s.xml?page=%d", session->hosturl,
 511                                 group_uri, session->group, session->page);
 512                 curl_easy_setopt(curl, CURLOPT_URL, endpoint);
 513
 514                 break;
 515         default:
 516                 break;
 517         }
 518
 519         if (session->proxy)
 520                 curl_easy_setopt(curl, CURLOPT_PROXY, session->proxy);
 521
 522         if (debug)
 523                 curl_easy_setopt(curl, CURLOPT_VERBOSE, 1);
 524
 525         dbg("user_password = %s\n", user_password);
 526         dbg("data = %s\n", data);
 527         dbg("proxy = %s\n", session->proxy);
 528
 529         curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, curl_callback);
 530         curl_easy_setopt(curl, CURLOPT_WRITEDATA, curl_buf);
 531         if (!session->dry_run) {
 532                 res = curl_easy_perform(curl);
 533                 if (res && !session->bash) {
 534                         fprintf(stderr, "error(%d) trying to perform "
 535                                 "operation\n", res);
 536                         return -EINVAL;
 537                 }
 538         }
 539
 540         curl_easy_cleanup(curl);
 541         if (session->action == ACTION_UPDATE)
 542                 curl_formfree(formpost);
 543         bti_curl_buffer_free(curl_buf);
 544         return 0;
 545 }
 546
 547 static void parse_configfile(struct session *session)
 548 {
 549         FILE *config_file;
 550         char *line = NULL;
 551         size_t len = 0;
 552         char *account = NULL;
 553         char *password = NULL;
 554         char *host = NULL;
 555         char *proxy = NULL;
 556         char *logfile = NULL;
 557         char *action = NULL;
 558         char *user = NULL;
 559         char *file;
 560         int shrink_urls = 0;
 561
 562         config_file = fopen(session->configfile, "r");
 563
 564         /* No error if file does not exist or is unreadable.  */
 565         if (config_file == NULL)
 566                 return;
 567
 568         do {
 569                 ssize_t n = getline(&line, &len, config_file);
 570                 if (n < 0)
 571                         break;
 572                 if (line[n - 1] == '\n')
 573                         line[n - 1] = '\0';
 574                 /* Parse file.  Format is the usual value pairs:
 575                    account=name
 576                    passwort=value
 577                    # is a comment character
 578                 */
 579                 *strchrnul(line, '#') = '\0';
 580                 char *c = line;
 581                 while (isspace(*c))
 582                         c++;
 583                 /* Ignore blank lines.  */
 584                 if (c[0] == '\0')
 585                         continue;
 586
 587                 if (!strncasecmp(c, "account", 7) && (c[7] == '=')) {
 588                         c += 8;
 589                         if (c[0] != '\0')
 590                                 account = strdup(c);
 591                 } else if (!strncasecmp(c, "password", 8) &&
 592                            (c[8] == '=')) {
 593                         c += 9;
 594                         if (c[0] != '\0')
 595                                 password = strdup(c);
 596                 } else if (!strncasecmp(c, "host", 4) &&
 597                            (c[4] == '=')) {
 598                         c += 5;
 599                         if (c[0] != '\0')
 600                                 host = strdup(c);
 601                 } else if (!strncasecmp(c, "proxy", 5) &&
 602                            (c[5] == '=')) {
 603                         c += 6;
 604                         if (c[0] != '\0')
 605                                 proxy = strdup(c);
 606                 } else if (!strncasecmp(c, "logfile", 7) &&
 607                            (c[7] == '=')) {
 608                         c += 8;
 609                         if (c[0] != '\0')
 610                                 logfile = strdup(c);
 611                 } else if (!strncasecmp(c, "action", 6) &&
 612                            (c[6] == '=')) {
 613                         c += 7;
 614                         if (c[0] != '\0')
 615                                 action = strdup(c);
 616                 } else if (!strncasecmp(c, "user", 4) &&
 617                                 (c[4] == '=')) {
 618                         c += 5;
 619                         if (c[0] != '\0')
 620                                 user = strdup(c);
 621                 } else if (!strncasecmp(c, "shrink-urls", 11) &&
 622                                 (c[11] == '=')) {
 623                         c += 12;
 624                         if (!strncasecmp(c, "true", 4) ||
 625                                         !strncasecmp(c, "yes", 3))
 626                                 shrink_urls = 1;
 627                 } else if (!strncasecmp(c, "verbose", 7) &&
 628                                 (c[7] == '=')) {
 629                         c += 8;
 630                         if (!strncasecmp(c, "true", 4) ||
 631                                         !strncasecmp(c, "yes", 3))
 632                                 verbose = 1;
 633                 }
 634         } while (!feof(config_file));
 635
 636         if (password)
 637                 session->password = password;
 638         if (account)
 639                 session->account = account;
 640         if (host) {
 641                 if (strcasecmp(host, "twitter") == 0) {
 642                         session->host = HOST_TWITTER;
 643                         session->hosturl = strdup(twitter_host);
 644                         session->hostname = strdup(twitter_name);
 645                 } else if (strcasecmp(host, "identica") == 0) {
 646                         session->host = HOST_IDENTICA;
 647                         session->hosturl = strdup(identica_host);
 648                         session->hostname = strdup(identica_name);
 649                 } else {
 650                         session->host = HOST_CUSTOM;
 651                         session->hosturl = strdup(host);
 652                         session->hostname = strdup(host);
 653                 }
 654                 free(host);
 655         }
 656         if (proxy) {
 657                 if (session->proxy)
 658                         free(session->proxy);
 659                 session->proxy = proxy;
 660         }
 661         if (logfile)
 662                 session->logfile = logfile;
 663         if (action) {
 664                 if (strcasecmp(action, "update") == 0)
 665                         session->action = ACTION_UPDATE;
 666                 else if (strcasecmp(action, "friends") == 0)
 667                         session->action = ACTION_FRIENDS;
 668                 else if (strcasecmp(action, "user") == 0)
 669                         session->action = ACTION_USER;
 670                 else if (strcasecmp(action, "replies") == 0)
 671                         session->action = ACTION_REPLIES;
 672                 else if (strcasecmp(action, "public") == 0)
 673                         session->action = ACTION_PUBLIC;
 674                 else if (strcasecmp(action, "group") == 0)
 675                         session->action = ACTION_GROUP;
 676                 else
 677                         session->action = ACTION_UNKNOWN;
 678                 free(action);
 679         }
 680         if (user)
 681                 session->user = user;
 682         session->shrink_urls = shrink_urls;
 683
 684         /* Free buffer and close file.  */
 685         free(line);
 686         fclose(config_file);
 687 }
 688
 689 static void log_session(struct session *session, int retval)
 690 {
 691         FILE *log_file;
 692         char *filename;
 693
 694         /* Only log something if we have a log file set */
 695         if (!session->logfile)
 696                 return;
 697
 698         filename = alloca(strlen(session->homedir) +
 699                           strlen(session->logfile) + 3);
 700
 701         sprintf(filename, "%s/%s", session->homedir, session->logfile);
 702
 703         log_file = fopen(filename, "a+");
 704         if (log_file == NULL)
 705                 return;
 706
 707         switch (session->action) {
 708         case ACTION_UPDATE:
 709                 if (retval)
 710                         fprintf(log_file, "%s: host=%s tweet failed\n",
 711                                 session->time, session->hostname);
 712                 else
 713                         fprintf(log_file, "%s: host=%s tweet=%s\n",
 714                                 session->time, session->hostname,
 715                                 session->tweet);
 716                 break;
 717         case ACTION_FRIENDS:
 718                 fprintf(log_file, "%s: host=%s retrieving friends timeline\n",
 719                         session->time, session->hostname);
 720                 break;
 721         case ACTION_USER:
 722                 fprintf(log_file, "%s: host=%s retrieving %s's timeline\n",
 723                         session->time, session->hostname, session->user);
 724                 break;
 725         case ACTION_REPLIES:
 726                 fprintf(log_file, "%s: host=%s retrieving replies\n",
 727                         session->time, session->hostname);
 728                 break;
 729         case ACTION_PUBLIC:
 730                 fprintf(log_file, "%s: host=%s retrieving public timeline\n",
 731                         session->time, session->hostname);
 732                 break;
 733         case ACTION_GROUP:
 734                 fprintf(log_file, "%s: host=%s retrieving group timeline\n",
 735                         session->time, session->hostname);
 736                 break;
 737         default:
 738                 break;
 739         }
 740
 741         fclose(log_file);
 742 }
 743
 744 static char *get_string_from_stdin(void)
 745 {
 746         char *temp;
 747         char *string;
 748
 749         string = zalloc(1000);
 750         if (!string)
 751                 return NULL;
 752
 753         if (!fgets(string, 999, stdin))
 754                 return NULL;
 755         temp = strchr(string, '\n');
 756         if (temp)
 757                 *temp = '\0';
 758         return string;
 759 }
 760
 761 static void read_password(char *buf, size_t len, char *host)
 762 {
 763         char pwd[80];
 764         int retval;
 765         struct termios old;
 766         struct termios tp;
 767
 768         tcgetattr(0, &tp);
 769         old = tp;
 770
 771         tp.c_lflag &= (~ECHO);
 772         tcsetattr(0, TCSANOW, &tp);
 773
 774         fprintf(stdout, "Enter password for %s: ", host);
 775         fflush(stdout);
 776         tcflow(0, TCOOFF);
 777         retval = scanf("%79s", pwd);
 778         tcflow(0, TCOON);
 779         fprintf(stdout, "\n");
 780
 781         tcsetattr(0, TCSANOW, &old);
 782
 783         strncpy(buf, pwd, len);
 784         buf[len-1] = '\0';
 785 }
 786
 787 static int find_urls(const char *tweet, int **pranges)
 788 {
 789         /*
 790          * magic obtained from
 791          * http://www.geekpedia.com/KB65_How-to-validate-an-URL-using-RegEx-in-Csharp.html
 792          */
 793         static const char *re_magic =
 794                 "(([a-zA-Z][0-9a-zA-Z+\\-\\.]*:)/{1,3}"
 795                 "[0-9a-zA-Z;/~?:@&=+$\\.\\-_'()%]+)"
 796                 "(#[0-9a-zA-Z;/?:@&=+$\\.\\-_!~*'()%]+)?";
 797         pcre *re;
 798         const char *errptr;
 799         int erroffset;
 800         int ovector[10] = {0,};
 801         const size_t ovsize = sizeof(ovector)/sizeof(*ovector);
 802         int startoffset, tweetlen;
 803         int i, rc;
 804         int rbound = 10;
 805         int rcount = 0;
 806         int *ranges = malloc(sizeof(int) * rbound);
 807
 808         re = pcre_compile(re_magic,
 809                         PCRE_NO_AUTO_CAPTURE,
 810                         &errptr, &erroffset, NULL);
 811         if (!re) {
 812                 fprintf(stderr, "pcre_compile @%u: %s\n", erroffset, errptr);
 813                 exit(1);
 814         }
 815
 816         tweetlen = strlen(tweet);
 817         for (startoffset = 0; startoffset < tweetlen; ) {
 818
 819                 rc = pcre_exec(re, NULL, tweet, strlen(tweet), startoffset, 0,
 820                                 ovector, ovsize);
 821                 if (rc == PCRE_ERROR_NOMATCH)
 822                         break;
 823
 824                 if (rc < 0) {
 825                         fprintf(stderr, "pcre_exec @%u: %s\n",
 826                                 erroffset, errptr);
 827                         exit(1);
 828                 }
 829
 830                 for (i = 0; i < rc; i += 2) {
 831                         if ((rcount+2) == rbound) {
 832                                 rbound *= 2;
 833                                 ranges = realloc(ranges, sizeof(int) * rbound);
 834                         }
 835
 836                         ranges[rcount++] = ovector[i];
 837                         ranges[rcount++] = ovector[i+1];
 838                 }
 839
 840                 startoffset = ovector[1];
 841         }
 842
 843         pcre_free(re);
 844
 845         *pranges = ranges;
 846         return rcount;
 847 }
 848
 849 /**
 850  * bidirectional popen() call
 851  *
 852  * @param rwepipe - int array of size three
 853  * @param exe - program to run
 854  * @param argv - argument list
 855  * @return pid or -1 on error
 856  *
 857  * The caller passes in an array of three integers (rwepipe), on successful
 858  * execution it can then write to element 0 (stdin of exe), and read from
 859  * element 1 (stdout) and 2 (stderr).
 860  */
 861 static int popenRWE(int *rwepipe, const char *exe, const char *const argv[])
 862 {
 863         int in[2];
 864         int out[2];
 865         int err[2];
 866         int pid;
 867         int rc;
 868
 869         rc = pipe(in);
 870         if (rc < 0)
 871                 goto error_in;
 872
 873         rc = pipe(out);
 874         if (rc < 0)
 875                 goto error_out;
 876
 877         rc = pipe(err);
 878         if (rc < 0)
 879                 goto error_err;
 880
 881         pid = fork();
 882         if (pid > 0) {
 883                 /* parent */
 884                 close(in[0]);
 885                 close(out[1]);
 886                 close(err[1]);
 887                 rwepipe[0] = in[1];
 888                 rwepipe[1] = out[0];
 889                 rwepipe[2] = err[0];
 890                 return pid;
 891         } else if (pid == 0) {
 892                 /* child */
 893                 close(in[1]);
 894                 close(out[0]);
 895                 close(err[0]);
 896                 close(0);
 897                 rc = dup(in[0]);
 898                 close(1);
 899                 rc = dup(out[1]);
 900                 close(2);
 901                 rc = dup(err[1]);
 902
 903                 execvp(exe, (char **)argv);
 904                 exit(1);
 905         } else
 906                 goto error_fork;
 907
 908         return pid;
 909
 910 error_fork:
 911         close(err[0]);
 912         close(err[1]);
 913 error_err:
 914         close(out[0]);
 915         close(out[1]);
 916 error_out:
 917         close(in[0]);
 918         close(in[1]);
 919 error_in:
 920         return -1;
 921 }
 922
 923 static int pcloseRWE(int pid, int *rwepipe)
 924 {
 925         int rc, status;
 926         close(rwepipe[0]);
 927         close(rwepipe[1]);
 928         close(rwepipe[2]);
 929         rc = waitpid(pid, &status, 0);
 930         return status;
 931 }
 932
 933 static char *shrink_one_url(int *rwepipe, char *big)
 934 {
 935         int biglen = strlen(big);
 936         char *small;
 937         int smalllen;
 938         int rc;
 939
 940         rc = dprintf(rwepipe[0], "%s\n", big);
 941         if (rc < 0)
 942                 return big;
 943
 944         smalllen = biglen + 128;
 945         small = malloc(smalllen);
 946         if (!small)
 947                 return big;
 948
 949         rc = read(rwepipe[1], small, smalllen);
 950         if (rc < 0 || rc > biglen)
 951                 goto error_free_small;
 952
 953         if (strncmp(small, "http://", 7))
 954                 goto error_free_small;
 955
 956         smalllen = rc;
 957         while (smalllen && isspace(small[smalllen-1]))
 958                         small[--smalllen] = 0;
 959
 960         free(big);
 961         return small;
 962
 963 error_free_small:
 964         free(small);
 965         return big;
 966 }
 967
 968 static char *shrink_urls(char *text)
 969 {
 970         int *ranges;
 971         int rcount;
 972         int i;
 973         int inofs = 0;
 974         int outofs = 0;
 975         const char *const shrink_args[] = {
 976                 "bti-shrink-urls",
 977                 NULL
 978         };
 979         int shrink_pid;
 980         int shrink_pipe[3];
 981         int inlen = strlen(text);
 982
 983         dbg("before len=%u\n", inlen);
 984
 985         shrink_pid = popenRWE(shrink_pipe, shrink_args[0], shrink_args);
 986         if (shrink_pid < 0)
 987                 return text;
 988
 989         rcount = find_urls(text, &ranges);
 990         if (!rcount)
 991                 return text;
 992
 993         for (i = 0; i < rcount; i += 2) {
 994                 int url_start = ranges[i];
 995                 int url_end = ranges[i+1];
 996                 int long_url_len = url_end - url_start;
 997                 char *url = strndup(text + url_start, long_url_len);
 998                 int short_url_len;
 999                 int not_url_len = url_start - inofs;
1000
1001                 dbg("long  url[%u]: %s\n", long_url_len, url);
1002                 url = shrink_one_url(shrink_pipe, url);
1003                 short_url_len = url ? strlen(url) : 0;
1004                 dbg("short url[%u]: %s\n", short_url_len, url);
1005
1006                 if (!url || short_url_len >= long_url_len) {
1007                         /* The short url ended up being too long
1008                          * or unavailable */
1009                         if (inofs) {
1010                                 strncpy(text + outofs, text + inofs,
1011                                                 not_url_len + long_url_len);
1012                         }
1013                         inofs += not_url_len + long_url_len;
1014                         outofs += not_url_len + long_url_len;
1015
1016                 } else {
1017                         /* copy the unmodified block */
1018                         strncpy(text + outofs, text + inofs, not_url_len);
1019                         inofs += not_url_len;
1020                         outofs += not_url_len;
1021
1022                         /* copy the new url */
1023                         strncpy(text + outofs, url, short_url_len);
1024                         inofs += long_url_len;
1025                         outofs += short_url_len;
1026                 }
1027
1028                 free(url);
1029         }
1030
1031         /* copy the last block after the last match */
1032         if (inofs) {
1033                 int tail = inlen - inofs;
1034                 if (tail) {
1035                         strncpy(text + outofs, text + inofs, tail);
1036                         outofs += tail;
1037                 }
1038         }
1039
1040         free(ranges);
1041
1042         (void)pcloseRWE(shrink_pid, shrink_pipe);
1043
1044         text[outofs] = 0;
1045         dbg("after len=%u\n", outofs);
1046         return text;
1047 }
1048
1049 int main(int argc, char *argv[], char *envp[])
1050 {
1051         static const struct option options[] = {
1052                 { "debug", 0, NULL, 'd' },
1053                 { "verbose", 0, NULL, 'V' },
1054                 { "account", 1, NULL, 'a' },
1055                 { "password", 1, NULL, 'p' },
1056                 { "host", 1, NULL, 'H' },
1057                 { "proxy", 1, NULL, 'P' },
1058                 { "action", 1, NULL, 'A' },
1059                 { "user", 1, NULL, 'u' },
1060                 { "group", 1, NULL, 'G' },
1061                 { "logfile", 1, NULL, 'L' },
1062                 { "shrink-urls", 0, NULL, 's' },
1063                 { "help", 0, NULL, 'h' },
1064                 { "bash", 0, NULL, 'b' },
1065                 { "dry-run", 0, NULL, 'n' },
1066                 { "page", 1, NULL, 'g' },
1067                 { "version", 0, NULL, 'v' },
1068                 { "config", 1, NULL, 'c' },
1069                 { }
1070         };
1071         struct session *session;
1072         pid_t child;
1073         char *tweet;
1074         static char password[80];
1075         int retval = 0;
1076         int option;
1077         char *http_proxy;
1078         time_t t;
1079         int page_nr;
1080
1081         debug = 0;
1082         verbose = 0;
1083
1084         session = session_alloc();
1085         if (!session) {
1086                 fprintf(stderr, "no more memory...\n");
1087                 return -1;
1088         }
1089
1090         /* get the current time so that we can log it later */
1091         time(&t);
1092         session->time = strdup(ctime(&t));
1093         session->time[strlen(session->time)-1] = 0x00;
1094
1095         /* Get the home directory so we can try to find a config file */
1096         session->homedir = strdup(getenv("HOME"));
1097
1098         /* set up a default config file location (traditionally ~/.bti) */
1099         session->configfile = zalloc(strlen(session->homedir) + 7);
1100         sprintf(session->configfile, "%s/.bti", session->homedir);
1101
1102         curl_global_init(CURL_GLOBAL_ALL);
1103
1104         /* Set environment variables first, before reading command line options
1105          * or config file values. */
1106         http_proxy = getenv("http_proxy");
1107         if (http_proxy) {
1108                 if (session->proxy)
1109                         free(session->proxy);
1110                 session->proxy = strdup(http_proxy);
1111                 dbg("http_proxy = %s\n", session->proxy);
1112         }
1113
1114         parse_configfile(session);
1115
1116         while (1) {
1117                 option = getopt_long_only(argc, argv, "dp:P:H:a:A:u:c:hg:G:snVv",
1118                                           options, NULL);
1119                 if (option == -1)
1120                         break;
1121                 switch (option) {
1122                 case 'd':
1123                         debug = 1;
1124                         break;
1125                 case 'V':
1126                         verbose = 1;
1127                         break;
1128                 case 'a':
1129                         if (session->account)
1130                                 free(session->account);
1131                         session->account = strdup(optarg);
1132                         dbg("account = %s\n", session->account);
1133                         break;
1134                 case 'g':
1135                         page_nr = atoi(optarg);
1136                         dbg("page = %d\n", page_nr);
1137                         session->page = page_nr;
1138                         break;
1139                 case 'p':
1140                         if (session->password)
1141                                 free(session->password);
1142                         session->password = strdup(optarg);
1143                         dbg("password = %s\n", session->password);
1144                         break;
1145                 case 'P':
1146                         if (session->proxy)
1147                                 free(session->proxy);
1148                         session->proxy = strdup(optarg);
1149                         dbg("proxy = %s\n", session->proxy);
1150                         break;
1151                 case 'A':
1152                         if (strcasecmp(optarg, "update") == 0)
1153                                 session->action = ACTION_UPDATE;
1154                         else if (strcasecmp(optarg, "friends") == 0)
1155                                 session->action = ACTION_FRIENDS;
1156                         else if (strcasecmp(optarg, "user") == 0)
1157                                 session->action = ACTION_USER;
1158                         else if (strcasecmp(optarg, "replies") == 0)
1159                                 session->action = ACTION_REPLIES;
1160                         else if (strcasecmp(optarg, "public") == 0)
1161                                 session->action = ACTION_PUBLIC;
1162                         else if (strcasecmp(optarg, "group") == 0)
1163                                 session->action = ACTION_GROUP;
1164                         else
1165                                 session->action = ACTION_UNKNOWN;
1166                         dbg("action = %d\n", session->action);
1167                         break;
1168                 case 'u':
1169                         if (session->user)
1170                                 free(session->user);
1171                         session->user = strdup(optarg);
1172                         dbg("user = %s\n", session->user);
1173                         break;
1174
1175                 case 'G':
1176                         if (session->group)
1177                                 free(session->group);
1178                         session->group = strdup(optarg);
1179                         dbg("group = %s\n", session->group);
1180                         break;
1181                 case 'L':
1182                         if (session->logfile)
1183                                 free(session->logfile);
1184                         session->logfile = strdup(optarg);
1185                         dbg("logfile = %s\n", session->logfile);
1186                         break;
1187                 case 's':
1188                         session->shrink_urls = 1;
1189                         break;
1190                 case 'H':
1191                         if (session->hosturl)
1192                                 free(session->hosturl);
1193                         if (session->hostname)
1194                                 free(session->hostname);
1195                         if (strcasecmp(optarg, "twitter") == 0) {
1196                                 session->host = HOST_TWITTER;
1197                                 session->hosturl = strdup(twitter_host);
1198                                 session->hostname = strdup(twitter_name);
1199                         } else if (strcasecmp(optarg, "identica") == 0) {
1200                                 session->host = HOST_IDENTICA;
1201                                 session->hosturl = strdup(identica_host);
1202                                 session->hostname = strdup(identica_name);
1203                         } else {
1204                                 session->host = HOST_CUSTOM;
1205                                 session->hosturl = strdup(optarg);
1206                                 session->hostname = strdup(optarg);
1207                         }
1208                         dbg("host = %d\n", session->host);
1209                         break;
1210                 case 'b':
1211                         session->bash = 1;
1212                         break;
1213                 case 'c':
1214                         if (session->configfile)
1215                                 free(session->configfile);
1216                         session->configfile = strdup(optarg);
1217                         dbg("configfile = %s\n", session->configfile);
1218
1219                         /*
1220                          * read the config file now.  Yes, this could override previously
1221                          * set options from the command line, but the user asked for it...
1222                          */
1223                         parse_configfile(session);
1224                         break;
1225                 case 'h':
1226                         display_help();
1227                         goto exit;
1228                 case 'n':
1229                         session->dry_run = 1;
1230                         break;
1231                 case 'v':
1232                         display_version();
1233                         goto exit;
1234                 default:
1235                         display_help();
1236                         goto exit;
1237                 }
1238         }
1239
1240         session_readline_init(session);
1241         /*
1242          * Show the version to make it easier to determine what
1243          * is going on here
1244          */
1245         if (debug)
1246                 display_version();
1247
1248         if (session->action == ACTION_UNKNOWN) {
1249                 fprintf(stderr, "Unknown action, valid actions are:\n");
1250                 fprintf(stderr, "'update', 'friends', 'public', "
1251                         "'replies', 'group' or 'user'.\n");
1252                 goto exit;
1253         }
1254
1255         if (session->host == HOST_TWITTER && session->action == ACTION_GROUP) {
1256                 fprintf(stderr, "Groups only work in Identi.ca.\n");
1257                 goto exit;
1258         }
1259
1260         if (session->action == ACTION_GROUP && !session->group) {
1261                 fprintf(stdout, "Enter group name: ");
1262                 session->group = session->readline(NULL);
1263         }
1264
1265         if (!session->account) {
1266                 fprintf(stdout, "Enter account for %s: ", session->hostname);
1267                 session->account = session->readline(NULL);
1268         }
1269
1270         if (!session->password) {
1271                 read_password(password, sizeof(password), session->hostname);
1272                 session->password = strdup(password);
1273         }
1274
1275         if (session->action == ACTION_UPDATE) {
1276                 if (session->bash || !session->interactive)
1277                         tweet = get_string_from_stdin();
1278                 else
1279                         tweet = session->readline("tweet: ");
1280                 if (!tweet || strlen(tweet) == 0) {
1281                         dbg("no tweet?\n");
1282                         return -1;
1283                 }
1284
1285                 if (session->shrink_urls)
1286                         tweet = shrink_urls(tweet);
1287
1288                 session->tweet = zalloc(strlen(tweet) + 10);
1289                 if (session->bash)
1290                         sprintf(session->tweet, "%c %s",
1291                                 getuid() ? '$' : '#', tweet);
1292                 else
1293                         sprintf(session->tweet, "%s", tweet);
1294
1295                 free(tweet);
1296                 dbg("tweet = %s\n", session->tweet);
1297         }
1298
1299         if (!session->user)
1300                 session->user = strdup(session->account);
1301
1302         if (session->page == 0)
1303                 session->page = 1;
1304         dbg("config file = %s\n", session->configfile);
1305         dbg("account = %s\n", session->account);
1306         dbg("password = %s\n", session->password);
1307         dbg("host = %d\n", session->host);
1308         dbg("action = %d\n", session->action);
1309
1310         /* fork ourself so that the main shell can get on
1311          * with it's life as we try to connect and handle everything
1312          */
1313         if (session->bash) {
1314                 child = fork();
1315                 if (child) {
1316                         dbg("child is %d\n", child);
1317                         exit(0);
1318                 }
1319         }
1320
1321         retval = send_request(session);
1322         if (retval && !session->bash)
1323                 fprintf(stderr, "operation failed\n");
1324
1325         log_session(session, retval);
1326 exit:
1327         session_readline_cleanup(session);
1328         session_free(session);
1329         return retval;;
1330 }