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