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                 handle = dlopen(cp, RTLD_NOW);
 194                 if (handle) {
 195                         dbg("Using %s for readline library\n", cp);
 196                         break;
 197                 }
 198         }
 199         free(tmp);
 200         if (!handle) {
 201                 dbg("No readline library found.\n");
 202                 return;
 203         }
 204
 205         session->readline_handle = handle;
 206         session->readline = (char *(*)(const char *))dlsym(handle, "readline");
 207         if (session->readline == NULL) {
 208                 /* something odd happened, default back to internal stuff */
 209                 session->readline_handle = NULL;
 210                 session->readline = get_string;
 211                 return;
 212         }
 213
 214         /*
 215          * If we found a library, turn off filename expansion
 216          * as that makes no sense from within bti.
 217          */
 218         bind_key = (int (*)(int, void *))dlsym(handle, "rl_bind_key");
 219         insert = (void (*)(void))dlsym(handle, "rl_insert");
 220         if (bind_key && insert)
 221                 bind_key('\t', insert);
 222 }
 223
 224 static void session_readline_cleanup(struct session *session)
 225 {
 226         if (session->readline_handle)
 227                 dlclose(session->readline_handle);
 228 }
 229
 230 static struct session *session_alloc(void)
 231 {
 232         struct session *session;
 233
 234         session = zalloc(sizeof(*session));
 235         if (!session)
 236                 return NULL;
 237         session_readline_init(session);
 238         return session;
 239 }
 240
 241 static void session_free(struct session *session)
 242 {
 243         if (!session)
 244                 return;
 245         session_readline_cleanup(session);
 246         free(session->password);
 247         free(session->account);
 248         free(session->tweet);
 249         free(session->proxy);
 250         free(session->time);
 251         free(session->homedir);
 252         free(session->user);
 253         free(session->group);
 254         free(session->hosturl);
 255         free(session->hostname);
 256         free(session);
 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 is ~/.bti  */
 557         file = alloca(strlen(session->homedir) + 7);
 558
 559         sprintf(file, "%s/.bti", session->homedir);
 560
 561         config_file = fopen(file, "r");
 562
 563         /* No error if file does not exist or is unreadable.  */
 564         if (config_file == NULL)
 565                 return;
 566
 567         do {
 568                 ssize_t n = getline(&line, &len, config_file);
 569                 if (n < 0)
 570                         break;
 571                 if (line[n - 1] == '\n')
 572                         line[n - 1] = '\0';
 573                 /* Parse file.  Format is the usual value pairs:
 574                    account=name
 575                    passwort=value
 576                    # is a comment character
 577                 */
 578                 *strchrnul(line, '#') = '\0';
 579                 char *c = line;
 580                 while (isspace(*c))
 581                         c++;
 582                 /* Ignore blank lines.  */
 583                 if (c[0] == '\0')
 584                         continue;
 585
 586                 if (!strncasecmp(c, "account", 7) && (c[7] == '=')) {
 587                         c += 8;
 588                         if (c[0] != '\0')
 589                                 account = strdup(c);
 590                 } else if (!strncasecmp(c, "password", 8) &&
 591                            (c[8] == '=')) {
 592                         c += 9;
 593                         if (c[0] != '\0')
 594                                 password = strdup(c);
 595                 } else if (!strncasecmp(c, "host", 4) &&
 596                            (c[4] == '=')) {
 597                         c += 5;
 598                         if (c[0] != '\0')
 599                                 host = strdup(c);
 600                 } else if (!strncasecmp(c, "proxy", 5) &&
 601                            (c[5] == '=')) {
 602                         c += 6;
 603                         if (c[0] != '\0')
 604                                 proxy = strdup(c);
 605                 } else if (!strncasecmp(c, "logfile", 7) &&
 606                            (c[7] == '=')) {
 607                         c += 8;
 608                         if (c[0] != '\0')
 609                                 logfile = strdup(c);
 610                 } else if (!strncasecmp(c, "action", 6) &&
 611                            (c[6] == '=')) {
 612                         c += 7;
 613                         if (c[0] != '\0')
 614                                 action = strdup(c);
 615                 } else if (!strncasecmp(c, "user", 4) &&
 616                                 (c[4] == '=')) {
 617                         c += 5;
 618                         if (c[0] != '\0')
 619                                 user = strdup(c);
 620                 } else if (!strncasecmp(c, "shrink-urls", 11) &&
 621                                 (c[11] == '=')) {
 622                         c += 12;
 623                         if (!strncasecmp(c, "true", 4) ||
 624                                         !strncasecmp(c, "yes", 3))
 625                                 shrink_urls = 1;
 626                 } else if (!strncasecmp(c, "verbose", 7) &&
 627                                 (c[7] == '=')) {
 628                         c += 8;
 629                         if (!strncasecmp(c, "true", 4) ||
 630                                         !strncasecmp(c, "yes", 3))
 631                                 verbose = 1;
 632                 }
 633         } while (!feof(config_file));
 634
 635         if (password)
 636                 session->password = password;
 637         if (account)
 638                 session->account = account;
 639         if (host) {
 640                 if (strcasecmp(host, "twitter") == 0) {
 641                         session->host = HOST_TWITTER;
 642                         session->hosturl = strdup(twitter_host);
 643                         session->hostname = strdup(twitter_name);
 644                 } else if (strcasecmp(host, "identica") == 0) {
 645                         session->host = HOST_IDENTICA;
 646                         session->hosturl = strdup(identica_host);
 647                         session->hostname = strdup(identica_name);
 648                 } else {
 649                         session->host = HOST_CUSTOM;
 650                         session->hosturl = strdup(host);
 651                         session->hostname = strdup(host);
 652                 }
 653                 free(host);
 654         }
 655         if (proxy) {
 656                 if (session->proxy)
 657                         free(session->proxy);
 658                 session->proxy = proxy;
 659         }
 660         if (logfile)
 661                 session->logfile = logfile;
 662         if (action) {
 663                 if (strcasecmp(action, "update") == 0)
 664                         session->action = ACTION_UPDATE;
 665                 else if (strcasecmp(action, "friends") == 0)
 666                         session->action = ACTION_FRIENDS;
 667                 else if (strcasecmp(action, "user") == 0)
 668                         session->action = ACTION_USER;
 669                 else if (strcasecmp(action, "replies") == 0)
 670                         session->action = ACTION_REPLIES;
 671                 else if (strcasecmp(action, "public") == 0)
 672                         session->action = ACTION_PUBLIC;
 673                 else if (strcasecmp(action, "group") == 0)
 674                         session->action = ACTION_GROUP;
 675                 else
 676                         session->action = ACTION_UNKNOWN;
 677                 free(action);
 678         }
 679         if (user)
 680                 session->user = user;
 681         session->shrink_urls = shrink_urls;
 682
 683         /* Free buffer and close file.  */
 684         free(line);
 685         fclose(config_file);
 686 }
 687
 688 static void log_session(struct session *session, int retval)
 689 {
 690         FILE *log_file;
 691         char *filename;
 692
 693         /* Only log something if we have a log file set */
 694         if (!session->logfile)
 695                 return;
 696
 697         filename = alloca(strlen(session->homedir) +
 698                           strlen(session->logfile) + 3);
 699
 700         sprintf(filename, "%s/%s", session->homedir, session->logfile);
 701
 702         log_file = fopen(filename, "a+");
 703         if (log_file == NULL)
 704                 return;
 705
 706         switch (session->action) {
 707         case ACTION_UPDATE:
 708                 if (retval)
 709                         fprintf(log_file, "%s: host=%s tweet failed\n",
 710                                 session->time, session->hostname);
 711                 else
 712                         fprintf(log_file, "%s: host=%s tweet=%s\n",
 713                                 session->time, session->hostname,
 714                                 session->tweet);
 715                 break;
 716         case ACTION_FRIENDS:
 717                 fprintf(log_file, "%s: host=%s retrieving friends timeline\n",
 718                         session->time, session->hostname);
 719                 break;
 720         case ACTION_USER:
 721                 fprintf(log_file, "%s: host=%s retrieving %s's timeline\n",
 722                         session->time, session->hostname, session->user);
 723                 break;
 724         case ACTION_REPLIES:
 725                 fprintf(log_file, "%s: host=%s retrieving replies\n",
 726                         session->time, session->hostname);
 727                 break;
 728         case ACTION_PUBLIC:
 729                 fprintf(log_file, "%s: host=%s retrieving public timeline\n",
 730                         session->time, session->hostname);
 731                 break;
 732         case ACTION_GROUP:
 733                 fprintf(log_file, "%s: host=%s retrieving group timeline\n",
 734                         session->time, session->hostname);
 735                 break;
 736         default:
 737                 break;
 738         }
 739
 740         fclose(log_file);
 741 }
 742
 743 static char *get_string_from_stdin(void)
 744 {
 745         char *temp;
 746         char *string;
 747
 748         string = zalloc(1000);
 749         if (!string)
 750                 return NULL;
 751
 752         if (!fgets(string, 999, stdin))
 753                 return NULL;
 754         temp = strchr(string, '\n');
 755         if (temp)
 756                 *temp = '\0';
 757         return string;
 758 }
 759
 760 static void read_password(char *buf, size_t len, char *host)
 761 {
 762         char pwd[80];
 763         int retval;
 764         struct termios old;
 765         struct termios tp;
 766
 767         tcgetattr(0, &tp);
 768         old = tp;
 769
 770         tp.c_lflag &= (~ECHO);
 771         tcsetattr(0, TCSANOW, &tp);
 772
 773         fprintf(stdout, "Enter password for %s: ", host);
 774         fflush(stdout);
 775         tcflow(0, TCOOFF);
 776         retval = scanf("%79s", pwd);
 777         tcflow(0, TCOON);
 778         fprintf(stdout, "\n");
 779
 780         tcsetattr(0, TCSANOW, &old);
 781
 782         strncpy(buf, pwd, len);
 783         buf[len-1] = '\0';
 784 }
 785
 786 static int find_urls(const char *tweet, int **pranges)
 787 {
 788         /*
 789          * magic obtained from
 790          * http://www.geekpedia.com/KB65_How-to-validate-an-URL-using-RegEx-in-Csharp.html
 791          */
 792         static const char *re_magic =
 793                 "(([a-zA-Z][0-9a-zA-Z+\\-\\.]*:)/{1,3}"
 794                 "[0-9a-zA-Z;/~?:@&=+$\\.\\-_'()%]+)"
 795                 "(#[0-9a-zA-Z;/?:@&=+$\\.\\-_!~*'()%]+)?";
 796         pcre *re;
 797         const char *errptr;
 798         int erroffset;
 799         int ovector[10] = {0,};
 800         const size_t ovsize = sizeof(ovector)/sizeof(*ovector);
 801         int startoffset, tweetlen;
 802         int i, rc;
 803         int rbound = 10;
 804         int rcount = 0;
 805         int *ranges = malloc(sizeof(int) * rbound);
 806
 807         re = pcre_compile(re_magic,
 808                         PCRE_NO_AUTO_CAPTURE,
 809                         &errptr, &erroffset, NULL);
 810         if (!re) {
 811                 fprintf(stderr, "pcre_compile @%u: %s\n", erroffset, errptr);
 812                 exit(1);
 813         }
 814
 815         tweetlen = strlen(tweet);
 816         for (startoffset = 0; startoffset < tweetlen; ) {
 817
 818                 rc = pcre_exec(re, NULL, tweet, strlen(tweet), startoffset, 0,
 819                                 ovector, ovsize);
 820                 if (rc == PCRE_ERROR_NOMATCH)
 821                         break;
 822
 823                 if (rc < 0) {
 824                         fprintf(stderr, "pcre_exec @%u: %s\n",
 825                                 erroffset, errptr);
 826                         exit(1);
 827                 }
 828
 829                 for (i = 0; i < rc; i += 2) {
 830                         if ((rcount+2) == rbound) {
 831                                 rbound *= 2;
 832                                 ranges = realloc(ranges, sizeof(int) * rbound);
 833                         }
 834
 835                         ranges[rcount++] = ovector[i];
 836                         ranges[rcount++] = ovector[i+1];
 837                 }
 838
 839                 startoffset = ovector[1];
 840         }
 841
 842         pcre_free(re);
 843
 844         *pranges = ranges;
 845         return rcount;
 846 }
 847
 848 /**
 849  * bidirectional popen() call
 850  *
 851  * @param rwepipe - int array of size three
 852  * @param exe - program to run
 853  * @param argv - argument list
 854  * @return pid or -1 on error
 855  *
 856  * The caller passes in an array of three integers (rwepipe), on successful
 857  * execution it can then write to element 0 (stdin of exe), and read from
 858  * element 1 (stdout) and 2 (stderr).
 859  */
 860 static int popenRWE(int *rwepipe, const char *exe, const char *const argv[])
 861 {
 862         int in[2];
 863         int out[2];
 864         int err[2];
 865         int pid;
 866         int rc;
 867
 868         rc = pipe(in);
 869         if (rc < 0)
 870                 goto error_in;
 871
 872         rc = pipe(out);
 873         if (rc < 0)
 874                 goto error_out;
 875
 876         rc = pipe(err);
 877         if (rc < 0)
 878                 goto error_err;
 879
 880         pid = fork();
 881         if (pid > 0) {
 882                 /* parent */
 883                 close(in[0]);
 884                 close(out[1]);
 885                 close(err[1]);
 886                 rwepipe[0] = in[1];
 887                 rwepipe[1] = out[0];
 888                 rwepipe[2] = err[0];
 889                 return pid;
 890         } else if (pid == 0) {
 891                 /* child */
 892                 close(in[1]);
 893                 close(out[0]);
 894                 close(err[0]);
 895                 close(0);
 896                 rc = dup(in[0]);
 897                 close(1);
 898                 rc = dup(out[1]);
 899                 close(2);
 900                 rc = dup(err[1]);
 901
 902                 execvp(exe, (char **)argv);
 903                 exit(1);
 904         } else
 905                 goto error_fork;
 906
 907         return pid;
 908
 909 error_fork:
 910         close(err[0]);
 911         close(err[1]);
 912 error_err:
 913         close(out[0]);
 914         close(out[1]);
 915 error_out:
 916         close(in[0]);
 917         close(in[1]);
 918 error_in:
 919         return -1;
 920 }
 921
 922 static int pcloseRWE(int pid, int *rwepipe)
 923 {
 924         int rc, status;
 925         close(rwepipe[0]);
 926         close(rwepipe[1]);
 927         close(rwepipe[2]);
 928         rc = waitpid(pid, &status, 0);
 929         return status;
 930 }
 931
 932 static char *shrink_one_url(int *rwepipe, char *big)
 933 {
 934         int biglen = strlen(big);
 935         char *small;
 936         int smalllen;
 937         int rc;
 938
 939         rc = dprintf(rwepipe[0], "%s\n", big);
 940         if (rc < 0)
 941                 return big;
 942
 943         smalllen = biglen + 128;
 944         small = malloc(smalllen);
 945         if (!small)
 946                 return big;
 947
 948         rc = read(rwepipe[1], small, smalllen);
 949         if (rc < 0 || rc > biglen)
 950                 goto error_free_small;
 951
 952         if (strncmp(small, "http://", 7))
 953                 goto error_free_small;
 954
 955         smalllen = rc;
 956         while (smalllen && isspace(small[smalllen-1]))
 957                         small[--smalllen] = 0;
 958
 959         free(big);
 960         return small;
 961
 962 error_free_small:
 963         free(small);
 964         return big;
 965 }
 966
 967 static char *shrink_urls(char *text)
 968 {
 969         int *ranges;
 970         int rcount;
 971         int i;
 972         int inofs = 0;
 973         int outofs = 0;
 974         const char *const shrink_args[] = {
 975                 "bti-shrink-urls",
 976                 NULL
 977         };
 978         int shrink_pid;
 979         int shrink_pipe[3];
 980         int inlen = strlen(text);
 981
 982         dbg("before len=%u\n", inlen);
 983
 984         shrink_pid = popenRWE(shrink_pipe, shrink_args[0], shrink_args);
 985         if (shrink_pid < 0)
 986                 return text;
 987
 988         rcount = find_urls(text, &ranges);
 989         if (!rcount)
 990                 return text;
 991
 992         for (i = 0; i < rcount; i += 2) {
 993                 int url_start = ranges[i];
 994                 int url_end = ranges[i+1];
 995                 int long_url_len = url_end - url_start;
 996                 char *url = strndup(text + url_start, long_url_len);
 997                 int short_url_len;
 998                 int not_url_len = url_start - inofs;
 999
1000                 dbg("long  url[%u]: %s\n", long_url_len, url);
1001                 url = shrink_one_url(shrink_pipe, url);
1002                 short_url_len = url ? strlen(url) : 0;
1003                 dbg("short url[%u]: %s\n", short_url_len, url);
1004
1005                 if (!url || short_url_len >= long_url_len) {
1006                         /* The short url ended up being too long
1007                          * or unavailable */
1008                         if (inofs) {
1009                                 strncpy(text + outofs, text + inofs,
1010                                                 not_url_len + long_url_len);
1011                         }
1012                         inofs += not_url_len + long_url_len;
1013                         outofs += not_url_len + long_url_len;
1014
1015                 } else {
1016                         /* copy the unmodified block */
1017                         strncpy(text + outofs, text + inofs, not_url_len);
1018                         inofs += not_url_len;
1019                         outofs += not_url_len;
1020
1021                         /* copy the new url */
1022                         strncpy(text + outofs, url, short_url_len);
1023                         inofs += long_url_len;
1024                         outofs += short_url_len;
1025                 }
1026
1027                 free(url);
1028         }
1029
1030         /* copy the last block after the last match */
1031         if (inofs) {
1032                 int tail = inlen - inofs;
1033                 if (tail) {
1034                         strncpy(text + outofs, text + inofs, tail);
1035                         outofs += tail;
1036                 }
1037         }
1038
1039         free(ranges);
1040
1041         (void)pcloseRWE(shrink_pid, shrink_pipe);
1042
1043         text[outofs] = 0;
1044         dbg("after len=%u\n", outofs);
1045         return text;
1046 }
1047
1048 int main(int argc, char *argv[], char *envp[])
1049 {
1050         static const struct option options[] = {
1051                 { "debug", 0, NULL, 'd' },
1052                 { "verbose", 0, NULL, 'V' },
1053                 { "account", 1, NULL, 'a' },
1054                 { "password", 1, NULL, 'p' },
1055                 { "host", 1, NULL, 'H' },
1056                 { "proxy", 1, NULL, 'P' },
1057                 { "action", 1, NULL, 'A' },
1058                 { "user", 1, NULL, 'u' },
1059                 { "group", 1, NULL, 'G' },
1060                 { "logfile", 1, NULL, 'L' },
1061                 { "shrink-urls", 0, NULL, 's' },
1062                 { "help", 0, NULL, 'h' },
1063                 { "bash", 0, NULL, 'b' },
1064                 { "dry-run", 0, NULL, 'n' },
1065                 { "page", 1, NULL, 'g' },
1066                 { "version", 0, NULL, 'v' },
1067                 { }
1068         };
1069         struct session *session;
1070         pid_t child;
1071         char *tweet;
1072         static char password[80];
1073         int retval = 0;
1074         int option;
1075         char *http_proxy;
1076         time_t t;
1077         int page_nr;
1078
1079         debug = 0;
1080         verbose = 0;
1081
1082         session = session_alloc();
1083         if (!session) {
1084                 fprintf(stderr, "no more memory...\n");
1085                 return -1;
1086         }
1087
1088         /* get the current time so that we can log it later */
1089         time(&t);
1090         session->time = strdup(ctime(&t));
1091         session->time[strlen(session->time)-1] = 0x00;
1092
1093         session->homedir = strdup(getenv("HOME"));
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         /*
1222          * Show the version to make it easier to determine what
1223          * is going on here
1224          */
1225         if (debug)
1226                 display_version();
1227
1228         if (session->action == ACTION_UNKNOWN) {
1229                 fprintf(stderr, "Unknown action, valid actions are:\n");
1230                 fprintf(stderr, "'update', 'friends', 'public', "
1231                         "'replies', 'group' or 'user'.\n");
1232                 goto exit;
1233         }
1234
1235         if (session->host == HOST_TWITTER && session->action == ACTION_GROUP) {
1236                 fprintf(stderr, "Groups only work in Identi.ca.\n");
1237                 goto exit;
1238         }
1239
1240         if (session->action == ACTION_GROUP && !session->group) {
1241                 fprintf(stdout, "Enter group name: ");
1242                 session->group = session->readline(NULL);
1243         }
1244
1245         if (!session->account) {
1246                 fprintf(stdout, "Enter account for %s: ", session->hostname);
1247                 session->account = session->readline(NULL);
1248         }
1249
1250         if (!session->password) {
1251                 read_password(password, sizeof(password), session->hostname);
1252                 session->password = strdup(password);
1253         }
1254
1255         if (session->action == ACTION_UPDATE) {
1256                 if (session->bash || !session->interactive)
1257                         tweet = get_string_from_stdin();
1258                 else
1259                         tweet = session->readline("tweet: ");
1260                 if (!tweet || strlen(tweet) == 0) {
1261                         dbg("no tweet?\n");
1262                         return -1;
1263                 }
1264
1265                 if (session->shrink_urls)
1266                         tweet = shrink_urls(tweet);
1267
1268                 session->tweet = zalloc(strlen(tweet) + 10);
1269                 if (session->bash)
1270                         sprintf(session->tweet, "%c %s",
1271                                 getuid() ? '$' : '#', tweet);
1272                 else
1273                         sprintf(session->tweet, "%s", tweet);
1274
1275                 free(tweet);
1276                 dbg("tweet = %s\n", session->tweet);
1277         }
1278
1279         if (!session->user)
1280                 session->user = strdup(session->account);
1281
1282         if (session->page == 0)
1283                 session->page = 1;
1284         dbg("account = %s\n", session->account);
1285         dbg("password = %s\n", session->password);
1286         dbg("host = %d\n", session->host);
1287         dbg("action = %d\n", session->action);
1288
1289         /* fork ourself so that the main shell can get on
1290          * with it's life as we try to connect and handle everything
1291          */
1292         if (session->bash) {
1293                 child = fork();
1294                 if (child) {
1295                         dbg("child is %d\n", child);
1296                         exit(0);
1297                 }
1298         }
1299
1300         retval = send_request(session);
1301         if (retval && !session->bash)
1302                 fprintf(stderr, "operation failed\n");
1303
1304         log_session(session, retval);
1305 exit:
1306         session_free(session);
1307         return retval;;
1308 }