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