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