bti.c

   1 /*
   2  * Copyright (C) 2008 Greg Kroah-Hartman <greg@kroah.com>
   3  * Copyright (C) 2009 Bart Trojanowski <bart@jukie.net>
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License as published by the
   7  * Free Software Foundation version 2 of the License.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along
  15  * with this program; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  17  */
  18
  19 #include <stdio.h>
  20 #include <stdlib.h>
  21 #include <stddef.h>
  22 #include <string.h>
  23 #include <getopt.h>
  24 #include <errno.h>
  25 #include <ctype.h>
  26 #include <fcntl.h>
  27 #include <unistd.h>
  28 #include <time.h>
  29 #include <sys/stat.h>
  30 #include <sys/types.h>
  31 #include <sys/wait.h>
  32 #include <curl/curl.h>
  33 #include <readline/readline.h>
  34 #include <libxml/xmlmemory.h>
  35 #include <libxml/parser.h>
  36 #include <libxml/tree.h>
  37 #include <pcre.h>
  38 #include "bti_version.h"
  39
  40
  41 #define zalloc(size)    calloc(size, 1)
  42
  43 #define dbg(format, arg...)                                             \
  44         do {                                                            \
  45                 if (debug)                                              \
  46                         printf("%s: " format , __func__ , ## arg);      \
  47         } while (0)
  48
  49
  50 static int debug;
  51
  52 enum host {
  53         HOST_TWITTER = 0,
  54         HOST_IDENTICA = 1,
  55 };
  56
  57 enum action {
  58         ACTION_UPDATE = 0,
  59         ACTION_FRIENDS = 1,
  60         ACTION_USER = 2,
  61         ACTION_REPLIES = 4,
  62         ACTION_PUBLIC = 8,
  63         ACTION_UNKNOWN = 16
  64 };
  65
  66 struct session {
  67         char *password;
  68         char *account;
  69         char *tweet;
  70         char *proxy;
  71         char *time;
  72         char *homedir;
  73         char *logfile;
  74         char *user;
  75         int bash;
  76         int shrink_urls;
  77         int dry_run;
  78         enum host host;
  79         enum action action;
  80 };
  81
  82 struct bti_curl_buffer {
  83         char *data;
  84         enum action action;
  85         int length;
  86 };
  87
  88 static void display_help(void)
  89 {
  90         fprintf(stdout, "bti - send tweet to twitter or identi.ca\n");
  91         fprintf(stdout, "Version: " BTI_VERSION "\n");
  92         fprintf(stdout, "Usage:\n");
  93         fprintf(stdout, "  bti [options]\n");
  94         fprintf(stdout, "options are:\n");
  95         fprintf(stdout, "  --account accountname\n");
  96         fprintf(stdout, "  --password password\n");
  97         fprintf(stdout, "  --action action\n");
  98         fprintf(stdout, "    ('update', 'friends', 'public', 'replies' or 'user')\n");
  99         fprintf(stdout, "  --user screenname\n");
 100         fprintf(stdout, "  --proxy PROXY:PORT\n");
 101         fprintf(stdout, "  --host HOST\n");
 102         fprintf(stdout, "  --logfile logfile\n");
 103         fprintf(stdout, "  --shrink-urls\n");
 104         fprintf(stdout, "  --bash\n");
 105         fprintf(stdout, "  --debug\n");
 106         fprintf(stdout, "  --version\n");
 107         fprintf(stdout, "  --help\n");
 108 }
 109
 110 static void display_version(void)
 111 {
 112         fprintf(stdout, "bti - version %s\n", BTI_VERSION);
 113 }
 114
 115 static struct session *session_alloc(void)
 116 {
 117         struct session *session;
 118
 119         session = zalloc(sizeof(*session));
 120         if (!session)
 121                 return NULL;
 122         return session;
 123 }
 124
 125 static void session_free(struct session *session)
 126 {
 127         if (!session)
 128                 return;
 129         free(session->password);
 130         free(session->account);
 131         free(session->tweet);
 132         free(session->proxy);
 133         free(session->time);
 134         free(session->homedir);
 135         free(session->user);
 136         free(session);
 137 }
 138
 139 static struct bti_curl_buffer *bti_curl_buffer_alloc(enum action action)
 140 {
 141         struct bti_curl_buffer *buffer;
 142
 143         buffer = zalloc(sizeof(*buffer));
 144         if (!buffer)
 145                 return NULL;
 146
 147         /* start out with a data buffer of 1 byte to
 148          * make the buffer fill logic simpler */
 149         buffer->data = zalloc(1);
 150         if (!buffer->data) {
 151                 free(buffer);
 152                 return NULL;
 153         }
 154         buffer->length = 0;
 155         buffer->action = action;
 156         return buffer;
 157 }
 158
 159 static void bti_curl_buffer_free(struct bti_curl_buffer *buffer)
 160 {
 161         if (!buffer)
 162                 return;
 163         free(buffer->data);
 164         free(buffer);
 165 }
 166
 167 static const char *twitter_user_url    = "http://twitter.com/statuses/user_timeline/";
 168 static const char *twitter_update_url  = "https://twitter.com/statuses/update.xml";
 169 static const char *twitter_public_url  = "http://twitter.com/statuses/public_timeline.xml";
 170 static const char *twitter_friends_url = "https://twitter.com/statuses/friends_timeline.xml";
 171 static const char *twitter_replies_url = "http://twitter.com/statuses/replies.xml";
 172
 173 static const char *identica_user_url    = "http://identi.ca/api/statuses/user_timeline/";
 174 static const char *identica_update_url  = "http://identi.ca/api/statuses/update.xml";
 175 static const char *identica_public_url  = "http://identi.ca/api/statuses/public_timeline.xml";
 176 static const char *identica_friends_url = "http://identi.ca/api/statuses/friends_timeline.xml";
 177 static const char *identica_replies_url = "http://identi.ca/api/statuses/replies.xml";
 178
 179 static CURL *curl_init(void)
 180 {
 181         CURL *curl;
 182
 183         curl = curl_easy_init();
 184         if (!curl) {
 185                 fprintf(stderr, "Can not init CURL!\n");
 186                 return NULL;
 187         }
 188         /* some ssl sanity checks on the connection we are making */
 189         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0);
 190         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0);
 191         return curl;
 192 }
 193
 194 void parse_statuses(xmlDocPtr doc, xmlNodePtr current)
 195 {
 196         xmlChar *text = NULL;
 197         xmlChar *user = NULL;
 198         xmlNodePtr userinfo;
 199
 200         current = current->xmlChildrenNode;
 201         while (current != NULL) {
 202                 if (current->type == XML_ELEMENT_NODE) {
 203                         if (!xmlStrcmp(current->name, (const xmlChar *)"text"))
 204                                 text = xmlNodeListGetString(doc, current->xmlChildrenNode, 1);
 205                         if (!xmlStrcmp(current->name, (const xmlChar *)"user")) {
 206                                 userinfo = current->xmlChildrenNode;
 207                                 while (userinfo != NULL) {
 208                                         if ((!xmlStrcmp(userinfo->name, (const xmlChar *)"screen_name"))) {
 209                                                 if (user)
 210                                                         xmlFree(user);
 211                                                 user = xmlNodeListGetString(doc, userinfo->xmlChildrenNode, 1);
 212                                         }
 213                                         userinfo = userinfo->next;
 214                                 }
 215                         }
 216                         if (user && text) {
 217                                 printf("[%s] %s\n", user, text);
 218                                 xmlFree(user);
 219                                 xmlFree(text);
 220                                 user = NULL;
 221                                 text = NULL;
 222                         }
 223                 }
 224                 current = current->next;
 225         }
 226
 227         return;
 228 }
 229
 230 static void parse_timeline(char *document)
 231 {
 232         xmlDocPtr doc;
 233         xmlNodePtr current;
 234         doc = xmlReadMemory(document, strlen(document), "timeline.xml", NULL, XML_PARSE_NOERROR);
 235
 236         if (doc == NULL)
 237                 return;
 238
 239         current = xmlDocGetRootElement(doc);
 240         if (current == NULL) {
 241                 fprintf(stderr, "empty document\n");
 242                 xmlFreeDoc(doc);
 243                 return;
 244         }
 245
 246         if (xmlStrcmp(current->name, (const xmlChar *) "statuses")) {
 247                 fprintf(stderr, "unexpected document type\n");
 248                 xmlFreeDoc(doc);
 249                 return;
 250         }
 251
 252         current = current->xmlChildrenNode;
 253         while (current != NULL) {
 254                 if ((!xmlStrcmp(current->name, (const xmlChar *)"status")))
 255                         parse_statuses(doc, current);
 256                 current = current->next;
 257         }
 258         xmlFreeDoc(doc);
 259
 260         return;
 261 }
 262
 263 size_t curl_callback(void *buffer, size_t size, size_t nmemb, void *userp)
 264 {
 265         struct bti_curl_buffer *curl_buf = userp;
 266         size_t buffer_size = size * nmemb;
 267         char *temp;
 268
 269         if ((!buffer) || (!buffer_size) || (!curl_buf))
 270                 return -EINVAL;
 271
 272         /* add to the data we already have */
 273         temp = zalloc(curl_buf->length + buffer_size + 1);
 274         if (!temp)
 275                 return -ENOMEM;
 276
 277         memcpy(temp, curl_buf->data, curl_buf->length);
 278         free(curl_buf->data);
 279         curl_buf->data = temp;
 280         memcpy(&curl_buf->data[curl_buf->length], (char *)buffer, buffer_size);
 281         curl_buf->length += buffer_size;
 282         if (curl_buf->action)
 283                 parse_timeline(curl_buf->data);
 284
 285         dbg("%s\n", curl_buf->data);
 286
 287         return buffer_size;
 288 }
 289
 290 static int send_request(struct session *session)
 291 {
 292         char user_password[500];
 293         char data[500];
 294         /* is there usernames longer than 22 chars? */
 295         char user_url[70];
 296         struct bti_curl_buffer *curl_buf;
 297         CURL *curl = NULL;
 298         CURLcode res;
 299         struct curl_httppost *formpost = NULL;
 300         struct curl_httppost *lastptr = NULL;
 301         struct curl_slist *slist = NULL;
 302
 303         if (!session)
 304                 return -EINVAL;
 305
 306         curl_buf = bti_curl_buffer_alloc(session->action);
 307         if (!curl_buf)
 308                 return -ENOMEM;
 309
 310         curl = curl_init();
 311         if (!curl)
 312                 return -EINVAL;
 313
 314         switch (session->action) {
 315         case ACTION_UPDATE:
 316                 snprintf(user_password, sizeof(user_password), "%s:%s",
 317                          session->account, session->password);
 318                 snprintf(data, sizeof(data), "status=\"%s\"", session->tweet);
 319                 curl_formadd(&formpost, &lastptr,
 320                              CURLFORM_COPYNAME, "status",
 321                              CURLFORM_COPYCONTENTS, session->tweet,
 322                              CURLFORM_END);
 323
 324                 curl_formadd(&formpost, &lastptr,
 325                              CURLFORM_COPYNAME, "source",
 326                              CURLFORM_COPYCONTENTS, "bti",
 327                              CURLFORM_END);
 328
 329                 curl_easy_setopt(curl, CURLOPT_HTTPPOST, formpost);
 330                 slist = curl_slist_append(slist, "Expect:");
 331                 curl_easy_setopt(curl, CURLOPT_HTTPHEADER, slist);
 332                 switch (session->host) {
 333                 case HOST_TWITTER:
 334                         curl_easy_setopt(curl, CURLOPT_URL, twitter_update_url);
 335                         break;
 336                 case HOST_IDENTICA:
 337                         curl_easy_setopt(curl, CURLOPT_URL, identica_update_url);
 338                         break;
 339                 }
 340                 curl_easy_setopt(curl, CURLOPT_USERPWD, user_password);
 341
 342                 break;
 343         case ACTION_FRIENDS:
 344                 snprintf(user_password, sizeof(user_password), "%s:%s",
 345                          session->account, session->password);
 346                 switch (session->host) {
 347                 case HOST_TWITTER:
 348                         curl_easy_setopt(curl, CURLOPT_URL, twitter_friends_url);
 349                         break;
 350                 case HOST_IDENTICA:
 351                         curl_easy_setopt(curl, CURLOPT_URL, identica_friends_url);
 352                         break;
 353                 }
 354                 curl_easy_setopt(curl, CURLOPT_USERPWD, user_password);
 355
 356                 break;
 357         case ACTION_USER:
 358                 switch (session->host) {
 359                 case HOST_TWITTER:
 360                         sprintf(user_url, "%s%s.xml", twitter_user_url, session->user);
 361                         curl_easy_setopt(curl, CURLOPT_URL, user_url);
 362                         break;
 363                 case HOST_IDENTICA:
 364                         sprintf(user_url, "%s%s.xml", identica_user_url, session->user);
 365                         curl_easy_setopt(curl, CURLOPT_URL, user_url);
 366                         break;
 367                 }
 368
 369                 break;
 370         case ACTION_REPLIES:
 371                 snprintf(user_password, sizeof(user_password), "%s:%s",
 372                          session->account, session->password);
 373                 switch (session->host) {
 374                 case HOST_TWITTER:
 375                         curl_easy_setopt(curl, CURLOPT_URL, twitter_replies_url);
 376                         break;
 377                 case HOST_IDENTICA:
 378                         curl_easy_setopt(curl, CURLOPT_URL, identica_replies_url);
 379                         break;
 380                 }
 381                 curl_easy_setopt(curl, CURLOPT_USERPWD, user_password);
 382
 383                 break;
 384         case ACTION_PUBLIC:
 385                 switch (session->host) {
 386                 case HOST_TWITTER:
 387                         curl_easy_setopt(curl, CURLOPT_URL, twitter_public_url);
 388                         break;
 389                 case HOST_IDENTICA:
 390                         curl_easy_setopt(curl, CURLOPT_URL, identica_public_url);
 391                         break;
 392                 }
 393
 394                 break;
 395         default:
 396                 break;
 397         }
 398
 399         if (session->proxy)
 400                 curl_easy_setopt(curl, CURLOPT_PROXY, session->proxy);
 401
 402         if (debug)
 403                 curl_easy_setopt(curl, CURLOPT_VERBOSE, 1);
 404
 405         dbg("user_password = %s\n", user_password);
 406         dbg("data = %s\n", data);
 407         dbg("proxy = %s\n", session->proxy);
 408
 409         curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, curl_callback);
 410         curl_easy_setopt(curl, CURLOPT_WRITEDATA, curl_buf);
 411         if (!session->dry_run) {
 412                 res = curl_easy_perform(curl);
 413                 if (res && !session->bash) {
 414                         fprintf(stderr, "error(%d) trying to perform operation\n", res);
 415                         return -EINVAL;
 416                 }
 417         }
 418
 419         curl_easy_cleanup(curl);
 420         if (session->action == ACTION_UPDATE)
 421                 curl_formfree(formpost);
 422         bti_curl_buffer_free(curl_buf);
 423         return 0;
 424 }
 425
 426 static void parse_configfile(struct session *session)
 427 {
 428         FILE *config_file;
 429         char *line = NULL;
 430         size_t len = 0;
 431         char *account = NULL;
 432         char *password = NULL;
 433         char *host = NULL;
 434         char *proxy = NULL;
 435         char *logfile = NULL;
 436         char *action = NULL;
 437         char *user = NULL;
 438         char *file;
 439         int shrink_urls = 0;
 440
 441         /* config file is ~/.bti  */
 442         file = alloca(strlen(session->homedir) + 7);
 443
 444         sprintf(file, "%s/.bti", session->homedir);
 445
 446         config_file = fopen(file, "r");
 447
 448         /* No error if file does not exist or is unreadable.  */
 449         if (config_file == NULL)
 450                 return;
 451
 452         do {
 453                 ssize_t n = getline(&line, &len, config_file);
 454                 if (n < 0)
 455                         break;
 456                 if (line[n - 1] == '\n')
 457                         line[n - 1] = '\0';
 458                 /* Parse file.  Format is the usual value pairs:
 459                    account=name
 460                    passwort=value
 461                    # is a comment character
 462                 */
 463                 *strchrnul(line, '#') = '\0';
 464                 char *c = line;
 465                 while (isspace(*c))
 466                         c++;
 467                 /* Ignore blank lines.  */
 468                 if (c[0] == '\0')
 469                         continue;
 470
 471                 if (!strncasecmp(c, "account", 7) && (c[7] == '=')) {
 472                         c += 8;
 473                         if (c[0] != '\0')
 474                                 account = strdup(c);
 475                 } else if (!strncasecmp(c, "password", 8) &&
 476                            (c[8] == '=')) {
 477                         c += 9;
 478                         if (c[0] != '\0')
 479                                 password = strdup(c);
 480                 } else if (!strncasecmp(c, "host", 4) &&
 481                            (c[4] == '=')) {
 482                         c += 5;
 483                         if (c[0] != '\0')
 484                                 host = strdup(c);
 485                 } else if (!strncasecmp(c, "proxy", 5) &&
 486                            (c[5] == '=')) {
 487                         c += 6;
 488                         if (c[0] != '\0')
 489                                 proxy = strdup(c);
 490                 } else if (!strncasecmp(c, "logfile", 7) &&
 491                            (c[7] == '=')) {
 492                         c += 8;
 493                         if (c[0] != '\0')
 494                                 logfile = strdup(c);
 495                 } else if (!strncasecmp(c, "action", 6) &&
 496                            (c[6] == '=')) {
 497                         c += 7;
 498                         if (c[0] != '\0')
 499                                 action = strdup(c);
 500                 } else if (!strncasecmp(c, "user", 4) &&
 501                                 (c[4] == '=')) {
 502                         c += 5;
 503                         if (c[0] != '\0')
 504                                 user = strdup(c);
 505                 } else if (!strncasecmp(c, "shrink-urls", 11) &&
 506                                 (c[11] == '=')) {
 507                         c += 12;
 508                         if (!strncasecmp(c, "true", 4) ||
 509                                         !strncasecmp(c, "yes", 3))
 510                                 shrink_urls = 1;
 511                 }
 512         } while (!feof(config_file));
 513
 514         if (password)
 515                 session->password = password;
 516         if (account)
 517                 session->account = account;
 518         if (host) {
 519                 if (strcasecmp(host, "twitter") == 0)
 520                         session->host = HOST_TWITTER;
 521                 if (strcasecmp(host, "identica") == 0)
 522                         session->host = HOST_IDENTICA;
 523                 free(host);
 524         }
 525         if (proxy) {
 526                 if (session->proxy)
 527                         free(session->proxy);
 528                 session->proxy = proxy;
 529         }
 530         if (logfile)
 531                 session->logfile = logfile;
 532         if (action) {
 533                 if (strcasecmp(action, "update") == 0)
 534                         session->action = ACTION_UPDATE;
 535                 else if (strcasecmp(action, "friends") == 0)
 536                         session->action = ACTION_FRIENDS;
 537                 else if (strcasecmp(action, "user") == 0)
 538                         session->action = ACTION_USER;
 539                 else if (strcasecmp(action, "replies") == 0)
 540                         session->action = ACTION_REPLIES;
 541                 else if (strcasecmp(action, "public") == 0)
 542                         session->action = ACTION_PUBLIC;
 543                 else
 544                         session->action = ACTION_UNKNOWN;
 545                 free(action);
 546         }
 547         if (user) {
 548                 session->user = user;
 549         }
 550         session->shrink_urls = shrink_urls;
 551
 552         /* Free buffer and close file.  */
 553         free(line);
 554         fclose(config_file);
 555 }
 556
 557 static void log_session(struct session *session, int retval)
 558 {
 559         FILE *log_file;
 560         char *filename;
 561         char *host;
 562
 563         /* Only log something if we have a log file set */
 564         if (!session->logfile)
 565                 return;
 566
 567         filename = alloca(strlen(session->homedir) +
 568                           strlen(session->logfile) + 3);
 569
 570         sprintf(filename, "%s/%s", session->homedir, session->logfile);
 571
 572         log_file = fopen(filename, "a+");
 573         if (log_file == NULL)
 574                 return;
 575         switch (session->host) {
 576         case HOST_TWITTER:
 577                 host = "twitter";
 578                 break;
 579         case HOST_IDENTICA:
 580                 host = "identi.ca";
 581                 break;
 582         default:
 583                 host = "unknown";
 584                 break;
 585         }
 586
 587         switch (session->action) {
 588         case ACTION_UPDATE:
 589                 if (retval)
 590                         fprintf(log_file, "%s: host=%s tweet failed\n",
 591                                 session->time, host);
 592                 else
 593                         fprintf(log_file, "%s: host=%s tweet=%s\n",
 594                                 session->time, host, session->tweet);
 595                 break;
 596         case ACTION_FRIENDS:
 597                 fprintf(log_file, "%s: host=%s retrieving friends timeline\n",
 598                         session->time, host);
 599                 break;
 600         case ACTION_USER:
 601                 fprintf(log_file, "%s: host=%s retrieving %s's timeline\n",
 602                         session->time, host, session->user);
 603                 break;
 604         case ACTION_REPLIES:
 605                 fprintf(log_file, "%s: host=%s retrieving replies\n",
 606                         session->time, host);
 607                 break;
 608         case ACTION_PUBLIC:
 609                 fprintf(log_file, "%s: host=%s retrieving public timeline\n",
 610                         session->time, host);
 611                 break;
 612         default:
 613                 break;
 614         }
 615
 616         fclose(log_file);
 617 }
 618
 619 static char *get_string_from_stdin(void)
 620 {
 621         char *temp;
 622         char *string;
 623
 624         string = zalloc(1000);
 625         if (!string)
 626                 return NULL;
 627
 628         if (!fgets(string, 999, stdin))
 629                 return NULL;
 630         temp = strchr(string, '\n');
 631         *temp = '\0';
 632         return string;
 633 }
 634
 635 static int find_urls(const char *tweet, int **pranges)
 636 {
 637         // magic obtained from http://www.geekpedia.com/KB65_How-to-validate-an-URL-using-RegEx-in-Csharp.html
 638         static const char *re_magic =
 639                 "(([a-zA-Z][0-9a-zA-Z+\\-\\.]*:)/{1,3}"
 640                 "[0-9a-zA-Z;/~?:@&=+$\\.\\-_'()%]+)"
 641                 "(#[0-9a-zA-Z;/?:@&=+$\\.\\-_!~*'()%]+)?";
 642         pcre *re;
 643         const char *errptr;
 644         int erroffset;
 645         int ovector[10] = {0,};
 646         const size_t ovsize = sizeof(ovector)/sizeof(*ovector);
 647         int startoffset, tweetlen;
 648         int i, rc;
 649         int rbound = 10;
 650         int rcount = 0;
 651         int *ranges = malloc(sizeof(int) * rbound);
 652
 653         re = pcre_compile(re_magic,
 654                         PCRE_NO_AUTO_CAPTURE,
 655                         &errptr, &erroffset, NULL);
 656         if (!re) {
 657                 fprintf(stderr, "pcre_compile @%u: %s\n", erroffset, errptr);
 658                 exit (1);
 659         }
 660
 661         tweetlen = strlen(tweet);
 662         for (startoffset=0; startoffset<tweetlen; ) {
 663
 664                 rc = pcre_exec(re, NULL, tweet, strlen(tweet), startoffset, 0,
 665                                 ovector, ovsize);
 666                 if (rc == PCRE_ERROR_NOMATCH)
 667                         break;
 668
 669                 if (rc<0) {
 670                         fprintf(stderr, "pcre_exec @%u: %s\n", erroffset, errptr);
 671                         exit (1);
 672                 }
 673
 674                 for (i=0; i<rc; i+=2) {
 675                         if ((rcount+2) == rbound) {
 676                                 rbound *= 2;
 677                                 ranges = realloc(ranges, sizeof(int) * rbound);
 678                         }
 679
 680                         ranges[rcount++] = ovector[i];
 681                         ranges[rcount++] = ovector[i+1];
 682                 }
 683
 684                 startoffset = ovector[1];
 685         }
 686
 687         pcre_free(re);
 688
 689         *pranges = ranges;
 690         return rcount;
 691 }
 692
 693 /**
 694  * bidirectional popen() call
 695  *
 696  * @param rwepipe - int array of size three
 697  * @param exe - program to run
 698  * @param argv - argument list
 699  * @return pid or -1 on error
 700  *
 701  * The caller passes in an array of three integers (rwepipe), on successful
 702  * execution it can then write to element 0 (stdin of exe), and read from
 703  * element 1 (stdout) and 2 (stderr).
 704  */
 705 static int popenRW(int *rwepipe, const char *exe, const char *const argv[])
 706 {
 707         int in[2];
 708         int out[2];
 709         int err[2];
 710         int pid;
 711         int rc;
 712
 713         rc = pipe(in);
 714         if (rc<0)
 715                 goto error_in;
 716
 717         rc = pipe(out);
 718         if (rc<0)
 719                 goto error_out;
 720
 721         rc = pipe(err);
 722         if (rc<0)
 723                 goto error_err;
 724
 725         pid = fork();
 726         if (pid > 0) { // parent
 727                 close(in[0]);
 728                 close(out[1]);
 729                 close(err[1]);
 730                 rwepipe[0] = in[1];
 731                 rwepipe[1] = out[0];
 732                 rwepipe[2] = err[0];
 733                 return pid;
 734         } else if (pid == 0) { // child
 735                 close(in[1]);
 736                 close(out[0]);
 737                 close(err[0]);
 738                 close(0);
 739                 dup(in[0]);
 740                 close(1);
 741                 dup(out[1]);
 742                 close(2);
 743                 dup(err[1]);
 744
 745                 execvp(exe, (char**)argv);
 746                 exit(1);
 747         } else
 748                 goto error_fork;
 749
 750         return pid;
 751
 752 error_fork:
 753         close(err[0]);
 754         close(err[1]);
 755 error_err:
 756         close(out[0]);
 757         close(out[1]);
 758 error_out:
 759         close(in[0]);
 760         close(in[1]);
 761 error_in:
 762         return -1;
 763 }
 764
 765 static int pcloseRW(int pid, int *rwepipe)
 766 {
 767         int rc, status;
 768         close(rwepipe[0]);
 769         close(rwepipe[1]);
 770         close(rwepipe[2]);
 771         rc = waitpid(pid, &status, 0);
 772         return status;
 773 }
 774
 775 static char *shrink_one_url(int *rwepipe, char *big)
 776 {
 777         int biglen = strlen(big);
 778         char *small;
 779         int smalllen;
 780         int rc;
 781
 782         rc = dprintf(rwepipe[0], "%s\n", big);
 783         if (rc < 0)
 784                 return big;
 785
 786         smalllen = biglen + 128;
 787         small = malloc(smalllen);
 788         if (!small)
 789                 return big;
 790
 791         rc = read(rwepipe[1], small, smalllen);
 792         if (rc < 0 || rc > biglen)
 793                 goto error_free_small;
 794
 795         if (strncmp(small, "http://", 7))
 796                 goto error_free_small;
 797
 798         smalllen = rc;
 799         while (smalllen && isspace(small[smalllen-1]))
 800                         small[--smalllen] = 0;
 801
 802         free (big);
 803         return small;
 804
 805 error_free_small:
 806         free(small);
 807         return big;
 808 }
 809
 810 static char *shrink_urls(char *text)
 811 {
 812         int *ranges;
 813         int rcount;
 814         int i;
 815         int inofs = 0;
 816         int outofs = 0;
 817         const char *const shrink_args[] = {
 818                 "bti-shrink-urls",
 819                 NULL
 820         };
 821         int shrink_pid;
 822         int shrink_pipe[2];
 823         int inlen = strlen(text);
 824
 825         dbg("before len=%u\n", inlen);
 826
 827         shrink_pid = popenRW(shrink_pipe, shrink_args[0], shrink_args);
 828         if (shrink_pid < 0)
 829                 return text;
 830
 831         rcount = find_urls(text, &ranges);
 832
 833         for (i=0; i<rcount; i+=2) {
 834                 int url_start = ranges[i];
 835                 int url_end = ranges[i+1];
 836                 int long_url_len = url_end - url_start;
 837                 char *url = strndup(text + url_start, long_url_len);
 838                 int short_url_len;
 839                 int not_url_len = url_start - inofs;
 840
 841                 dbg("long  url[%u]: %s\n", long_url_len, url);
 842                 url = shrink_one_url(shrink_pipe, url);
 843                 short_url_len = url ? strlen(url) : 0;
 844                 dbg("short url[%u]: %s\n", short_url_len, url);
 845
 846                 if (!url || short_url_len >= long_url_len) {
 847                         // the short url ended up being too long or unavailable
 848                         if (inofs) {
 849                                 strncpy(text + outofs, text + inofs,
 850                                                 not_url_len + long_url_len);
 851                         }
 852                         inofs += not_url_len + long_url_len;
 853                         outofs += not_url_len + long_url_len;
 854
 855                 } else {
 856                         // copy the unmodified block
 857                         strncpy(text + outofs, text + inofs, not_url_len);
 858                         inofs += not_url_len;
 859                         outofs += not_url_len;
 860
 861                         // copy the new url
 862                         strncpy(text + outofs, url, short_url_len);
 863                         inofs += long_url_len;
 864                         outofs += short_url_len;
 865                 }
 866
 867                 free (url);
 868         }
 869
 870         // copy the last block after the last match
 871         if (inofs) {
 872                 int tail = inlen - inofs;
 873                 if (tail) {
 874                         strncpy(text + outofs, text + inofs, tail);
 875                         outofs += tail;
 876                 }
 877         }
 878
 879         free(ranges);
 880
 881         (void)pcloseRW(shrink_pid, shrink_pipe);
 882
 883         text[outofs] = 0;
 884         dbg("after len=%u\n", outofs);
 885         return text;
 886 }
 887
 888 int main(int argc, char *argv[], char *envp[])
 889 {
 890         static const struct option options[] = {
 891                 { "debug", 0, NULL, 'd' },
 892                 { "account", 1, NULL, 'a' },
 893                 { "password", 1, NULL, 'p' },
 894                 { "host", 1, NULL, 'H' },
 895                 { "proxy", 1, NULL, 'P' },
 896                 { "action", 1, NULL, 'A' },
 897                 { "user", 1, NULL, 'u' },
 898                 { "logfile", 1, NULL, 'L' },
 899                 { "shrink-urls", 0, NULL, 's' },
 900                 { "help", 0, NULL, 'h' },
 901                 { "bash", 0, NULL, 'b' },
 902                 { "dry-run", 0, NULL, 'n' },
 903                 { "version", 0, NULL, 'v' },
 904                 { }
 905         };
 906         struct session *session;
 907         pid_t child;
 908         char *tweet;
 909         int retval = 0;
 910         int option;
 911         char *http_proxy;
 912         time_t t;
 913
 914         debug = 0;
 915         rl_bind_key('\t', rl_insert);
 916
 917         session = session_alloc();
 918         if (!session) {
 919                 fprintf(stderr, "no more memory...\n");
 920                 return -1;
 921         }
 922
 923         /* get the current time so that we can log it later */
 924         time(&t);
 925         session->time = strdup(ctime(&t));
 926         session->time[strlen(session->time)-1] = 0x00;
 927
 928         session->homedir = strdup(getenv("HOME"));
 929
 930         curl_global_init(CURL_GLOBAL_ALL);
 931
 932         /* Set environment variables first, before reading command line options
 933          * or config file values. */
 934         http_proxy = getenv("http_proxy");
 935         if (http_proxy) {
 936                 if (session->proxy)
 937                         free(session->proxy);
 938                 session->proxy = strdup(http_proxy);
 939                 dbg("http_proxy = %s\n", session->proxy);
 940         }
 941
 942         parse_configfile(session);
 943
 944         while (1) {
 945                 option = getopt_long_only(argc, argv, "dqe:p:P:H:a:A:u:h",
 946                                           options, NULL);
 947                 if (option == -1)
 948                         break;
 949                 switch (option) {
 950                 case 'd':
 951                         debug = 1;
 952                         break;
 953                 case 'a':
 954                         if (session->account)
 955                                 free(session->account);
 956                         session->account = strdup(optarg);
 957                         dbg("account = %s\n", session->account);
 958                         break;
 959                 case 'p':
 960                         if (session->password)
 961                                 free(session->password);
 962                         session->password = strdup(optarg);
 963                         dbg("password = %s\n", session->password);
 964                         break;
 965                 case 'P':
 966                         if (session->proxy)
 967                                 free(session->proxy);
 968                         session->proxy = strdup(optarg);
 969                         dbg("proxy = %s\n", session->proxy);
 970                         break;
 971                 case 'A':
 972                         if (strcasecmp(optarg, "update") == 0)
 973                                 session->action = ACTION_UPDATE;
 974                         else if (strcasecmp(optarg, "friends") == 0)
 975                                 session->action = ACTION_FRIENDS;
 976                         else if (strcasecmp(optarg, "user") == 0)
 977                                 session->action = ACTION_USER;
 978                         else if (strcasecmp(optarg, "replies") == 0)
 979                                 session->action = ACTION_REPLIES;
 980                         else if (strcasecmp(optarg, "public") == 0)
 981                                 session->action = ACTION_PUBLIC;
 982                         else
 983                                 session->action = ACTION_UNKNOWN;
 984                         dbg("action = %d\n", session->action);
 985                         break;
 986                 case 'u':
 987                         if (session->user)
 988                                 free(session->user);
 989                         session->user = strdup(optarg);
 990                         dbg("user = %s\n", session->user);
 991                         break;
 992                 case 'L':
 993                         if (session->logfile)
 994                                 free(session->logfile);
 995                         session->logfile = strdup(optarg);
 996                         dbg("logfile = %s\n", session->logfile);
 997                         break;
 998                 case 's':
 999                         session->shrink_urls = 1;
1000                         break;
1001                 case 'H':
1002                         if (strcasecmp(optarg, "twitter") == 0)
1003                                 session->host = HOST_TWITTER;
1004                         if (strcasecmp(optarg, "identica") == 0)
1005                                 session->host = HOST_IDENTICA;
1006                         dbg("host = %d\n", session->host);
1007                         break;
1008                 case 'b':
1009                         session->bash = 1;
1010                         break;
1011                 case 'h':
1012                         display_help();
1013                         goto exit;
1014                 case 'n':
1015                         session->dry_run = 1;
1016                         break;
1017                 case 'v':
1018                         display_version();
1019                         goto exit;
1020                 default:
1021                         display_help();
1022                         goto exit;
1023                 }
1024         }
1025
1026         if (session->action == ACTION_UNKNOWN) {
1027                 fprintf(stderr, "Unknown action, valid actions are:\n");
1028                 fprintf(stderr, "'update', 'friends', 'public', 'replies' or 'user'.\n");
1029                 goto exit;
1030         }
1031
1032         if (!session->account) {
1033                 fprintf(stdout, "Enter twitter account: ");
1034                 session->account = readline(NULL);
1035         }
1036
1037         if (!session->password) {
1038                 fprintf(stdout, "Enter twitter password: ");
1039                 session->password = readline(NULL);
1040         }
1041
1042         if (session->action == ACTION_UPDATE) {
1043                 if (session->bash)
1044                         tweet = get_string_from_stdin();
1045                 else
1046                         tweet = readline("tweet: ");
1047                 if (!tweet || strlen(tweet) == 0) {
1048                         dbg("no tweet?\n");
1049                         return -1;
1050                 }
1051
1052                 if (session->shrink_urls)
1053                         tweet = shrink_urls(tweet);
1054
1055                 session->tweet = zalloc(strlen(tweet) + 10);
1056                 if (session->bash)
1057                         sprintf(session->tweet, "$ %s", tweet);
1058                 else
1059                         sprintf(session->tweet, "%s", tweet);
1060
1061                 free(tweet);
1062                 dbg("tweet = %s\n", session->tweet);
1063         }
1064
1065         if (!session->user)
1066                 session->user = strdup(session->account);
1067
1068         dbg("account = %s\n", session->account);
1069         dbg("password = %s\n", session->password);
1070         dbg("host = %d\n", session->host);
1071         dbg("action = %d\n", session->action);
1072
1073         /* fork ourself so that the main shell can get on
1074          * with it's life as we try to connect and handle everything
1075          */
1076         if (session->bash) {
1077                 child = fork();
1078                 if (child) {
1079                         dbg("child is %d\n", child);
1080                         exit(0);
1081                 }
1082         }
1083
1084         retval = send_request(session);
1085         if (retval && !session->bash)
1086                 fprintf(stderr, "operation failed\n");
1087
1088         log_session(session, retval);
1089 exit:
1090         session_free(session);
1091         return retval;;
1092 }