bti.c

   1 /*
   2  * Copyright (C) 2008 Greg Kroah-Hartman <greg@kroah.com>
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU General Public License as published by the
   6  * Free Software Foundation version 2 of the License.
   7  *
   8  * This program is distributed in the hope that it will be useful, but
   9  * WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11  * General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along
  14  * with this program; if not, write to the Free Software Foundation, Inc.,
  15  * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  16  */
  17
  18 #include <stdio.h>
  19 #include <stdlib.h>
  20 #include <stddef.h>
  21 #include <string.h>
  22 #include <getopt.h>
  23 #include <errno.h>
  24 #include <ctype.h>
  25 #include <fcntl.h>
  26 #include <unistd.h>
  27 #include <time.h>
  28 #include <sys/stat.h>
  29 #include <curl/curl.h>
  30 #include <readline/readline.h>
  31 #include <libxml/xmlmemory.h>
  32 #include <libxml/parser.h>
  33 #include <libxml/tree.h>
  34 #include "bti_version.h"
  35
  36
  37 #define zalloc(size)    calloc(size, 1)
  38
  39 #define dbg(format, arg...)                                             \
  40         do {                                                            \
  41                 if (debug)                                              \
  42                         printf("%s: " format , __func__ , ## arg);      \
  43         } while (0)
  44
  45
  46 static int debug;
  47
  48 enum host {
  49         HOST_TWITTER = 0,
  50         HOST_IDENTICA = 1,
  51 };
  52
  53 enum action {
  54      ACTION_UPDATE = 0,
  55      ACTION_PUBLIC = 1,
  56      ACTION_FRIENDS = 2,
  57 };
  58
  59 struct session {
  60         char *password;
  61         char *account;
  62         char *tweet;
  63         char *proxy;
  64         char *time;
  65         char *homedir;
  66         char *logfile;
  67         int bash;
  68         enum host host;
  69         enum action action;
  70 };
  71
  72 struct bti_curl_buffer {
  73         char *data;
  74         enum action action;
  75         int length;
  76 };
  77
  78 static void display_help(void)
  79 {
  80         fprintf(stdout, "bti - send tweet to twitter\n");
  81         fprintf(stdout, "Version: " BTI_VERSION "\n");
  82         fprintf(stdout, "Usage:\n");
  83         fprintf(stdout, "  bti [options]\n");
  84         fprintf(stdout, "options are:\n");
  85         fprintf(stdout, "  --account accountname\n");
  86         fprintf(stdout, "  --password password\n");
  87         fprintf(stdout, "  --proxy PROXY:PORT\n");
  88         fprintf(stdout, "  --host HOST\n");
  89         fprintf(stdout, "  --logfile logfile\n");
  90         fprintf(stdout, "  --bash\n");
  91         fprintf(stdout, "  --action action\n");
  92         fprintf(stdout, "  --debug\n");
  93         fprintf(stdout, "  --version\n");
  94         fprintf(stdout, "  --help\n");
  95 }
  96
  97 static void display_version(void)
  98 {
  99         fprintf(stdout, "bti - version %s\n", BTI_VERSION);
 100 }
 101
 102 static struct session *session_alloc(void)
 103 {
 104         struct session *session;
 105
 106         session = zalloc(sizeof(*session));
 107         if (!session)
 108                 return NULL;
 109         return session;
 110 }
 111
 112 static void session_free(struct session *session)
 113 {
 114         if (!session)
 115                 return;
 116         free(session->password);
 117         free(session->account);
 118         free(session->tweet);
 119         free(session->proxy);
 120         free(session->time);
 121         free(session->homedir);
 122         free(session);
 123 }
 124
 125 static struct bti_curl_buffer *bti_curl_buffer_alloc(enum action action)
 126 {
 127         struct bti_curl_buffer *buffer;
 128
 129         buffer = zalloc(sizeof(*buffer));
 130         if (!buffer)
 131                 return NULL;
 132
 133         /* start out with a data buffer of 1 byte to
 134          * make the buffer fill logic simpler */
 135         buffer->data = zalloc(1);
 136         if (!buffer->data) {
 137                 free(buffer);
 138                 return NULL;
 139         }
 140         buffer->length = 0;
 141         buffer->action = action;
 142         return buffer;
 143 }
 144
 145 static void bti_curl_buffer_free(struct bti_curl_buffer *buffer)
 146 {
 147         if (!buffer)
 148                 return;
 149         free(buffer->data);
 150         free(buffer);
 151 }
 152
 153 static const char *twitter_update_url  = "https://twitter.com/statuses/update.xml";
 154 static const char *twitter_public_url  = "http://twitter.com/statuses/public_timeline.xml";
 155 static const char *twitter_friends_url = "https://twitter.com/statuses/friends_timeline.xml";
 156
 157 static const char *identica_update_url  = "http://identi.ca/api/statuses/update.xml";
 158 static const char *identica_public_url  = "http://identi.ca/api/statuses/public_timeline.xml";
 159 static const char *identica_friends_url = "http://identi.ca/api/statuses/friends_timeline.xml";
 160
 161 static CURL *curl_init(void)
 162 {
 163         CURL *curl;
 164
 165         curl = curl_easy_init();
 166         if (!curl) {
 167                 fprintf(stderr, "Can not init CURL!\n");
 168                 return NULL;
 169         }
 170         /* some ssl sanity checks on the connection we are making */
 171         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0);
 172         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0);
 173         return curl;
 174 }
 175
 176 void parse_statuses(xmlDocPtr doc, xmlNodePtr current)
 177 {
 178         xmlChar *text = NULL;
 179         xmlChar *user = NULL;
 180         xmlNodePtr userinfo;
 181
 182         current = current->xmlChildrenNode;
 183         while (current != NULL) {
 184                 if (current->type == XML_ELEMENT_NODE) {
 185                         if (!xmlStrcmp(current->name, (const xmlChar *)"text"))
 186                                 text = xmlNodeListGetString(doc, current->xmlChildrenNode, 1);
 187                         if (!xmlStrcmp(current->name, (const xmlChar *)"user")) {
 188                                 userinfo = current->xmlChildrenNode;
 189                                 while (userinfo != NULL) {
 190                                         if ((!xmlStrcmp(userinfo->name, (const xmlChar *)"screen_name"))) {
 191                                                 if (user)
 192                                                         xmlFree(user);
 193                                                 user = xmlNodeListGetString(doc, userinfo->xmlChildrenNode, 1);
 194                                         }
 195                                         userinfo = userinfo->next;
 196                                 }
 197                         }
 198                         if (user && text) {
 199                                 printf("[%s] %s\n", user, text);
 200                                 xmlFree(user);
 201                                 xmlFree(text);
 202                                 user = NULL;
 203                                 text = NULL;
 204                         }
 205                 }
 206                 current = current->next;
 207         }
 208
 209         return;
 210 }
 211
 212 static void parse_timeline(char *document)
 213 {
 214         xmlDocPtr doc;
 215         xmlNodePtr current;
 216         doc = xmlReadMemory(document, strlen(document), "timeline.xml", NULL, XML_PARSE_NOERROR);
 217
 218         if (doc == NULL)
 219                 return;
 220
 221         current = xmlDocGetRootElement(doc);
 222         if (current == NULL) {
 223                 fprintf(stderr, "empty document\n");
 224                 xmlFreeDoc(doc);
 225                 return;
 226         }
 227
 228         if (xmlStrcmp(current->name, (const xmlChar *) "statuses")) {
 229                 fprintf(stderr, "unexpected document type\n");
 230                 xmlFreeDoc(doc);
 231                 return;
 232         }
 233
 234         current = current->xmlChildrenNode;
 235         while (current != NULL) {
 236                 if ((!xmlStrcmp(current->name, (const xmlChar *)"status")))
 237                         parse_statuses(doc, current);
 238                 current = current->next;
 239         }
 240         xmlFreeDoc(doc);
 241
 242         return;
 243 }
 244
 245 size_t curl_callback(void *buffer, size_t size, size_t nmemb, void *userp)
 246 {
 247         struct bti_curl_buffer *curl_buf = userp;
 248         size_t buffer_size = size * nmemb;
 249         char *temp;
 250
 251         if ((!buffer) || (!buffer_size) || (!curl_buf))
 252                 return -EINVAL;
 253
 254         /* add to the data we already have */
 255         temp = zalloc(curl_buf->length + buffer_size + 1);
 256         if (!temp)
 257                 return -ENOMEM;
 258
 259         memcpy(temp, curl_buf->data, curl_buf->length);
 260         free(curl_buf->data);
 261         curl_buf->data = temp;
 262         memcpy(&curl_buf->data[curl_buf->length], (char *)buffer, buffer_size);
 263         curl_buf->length += buffer_size;
 264         if ((curl_buf->action == ACTION_FRIENDS) ||
 265                 (curl_buf->action == ACTION_PUBLIC))
 266                 parse_timeline(curl_buf->data);
 267
 268         dbg("%s\n", curl_buf->data);
 269
 270         return buffer_size;
 271 }
 272
 273 static int send_request(struct session *session)
 274 {
 275         char user_password[500];
 276         char data[500];
 277         struct bti_curl_buffer *curl_buf;
 278         CURL *curl = NULL;
 279         CURLcode res;
 280         struct curl_httppost *formpost = NULL;
 281         struct curl_httppost *lastptr = NULL;
 282         struct curl_slist *slist = NULL;
 283
 284         if (!session)
 285                 return -EINVAL;
 286
 287         curl_buf = bti_curl_buffer_alloc(session->action);
 288         if (!curl_buf)
 289                 return -ENOMEM;
 290
 291         curl = curl_init();
 292         if (!curl)
 293                 return -EINVAL;
 294
 295         switch (session->action) {
 296         case ACTION_UPDATE:
 297                 snprintf(user_password, sizeof(user_password), "%s:%s",
 298                          session->account, session->password);
 299                 snprintf(data, sizeof(data), "status=\"%s\"", session->tweet);
 300                 curl_formadd(&formpost, &lastptr,
 301                              CURLFORM_COPYNAME, "status",
 302                              CURLFORM_COPYCONTENTS, session->tweet,
 303                              CURLFORM_END);
 304
 305                 curl_formadd(&formpost, &lastptr,
 306                              CURLFORM_COPYNAME, "source",
 307                              CURLFORM_COPYCONTENTS, "bti",
 308                              CURLFORM_END);
 309
 310                 curl_easy_setopt(curl, CURLOPT_HTTPPOST, formpost);
 311                 slist = curl_slist_append(slist, "Expect:");
 312                 curl_easy_setopt(curl, CURLOPT_HTTPHEADER, slist);
 313                 switch (session->host) {
 314                 case HOST_TWITTER:
 315                         curl_easy_setopt(curl, CURLOPT_URL, twitter_update_url);
 316                         break;
 317                 case HOST_IDENTICA:
 318                         curl_easy_setopt(curl, CURLOPT_URL, identica_update_url);
 319                         break;
 320                 }
 321                 curl_easy_setopt(curl, CURLOPT_USERPWD, user_password);
 322
 323                 break;
 324         case ACTION_FRIENDS:
 325                 snprintf(user_password, sizeof(user_password), "%s:%s",
 326                          session->account, session->password);
 327                 switch (session->host) {
 328                 case HOST_TWITTER:
 329                         curl_easy_setopt(curl, CURLOPT_URL, twitter_friends_url);
 330                         break;
 331                 case HOST_IDENTICA:
 332                         curl_easy_setopt(curl, CURLOPT_URL, identica_friends_url);
 333                         break;
 334                 }
 335                 curl_easy_setopt(curl, CURLOPT_USERPWD, user_password);
 336
 337                 break;
 338         case ACTION_PUBLIC:
 339                 switch (session->host) {
 340                 case HOST_TWITTER:
 341                         curl_easy_setopt(curl, CURLOPT_URL, twitter_public_url);
 342                         break;
 343                 case HOST_IDENTICA:
 344                         curl_easy_setopt(curl, CURLOPT_URL, identica_public_url);
 345                         break;
 346                 }
 347
 348                 break;
 349         }
 350
 351         if (session->proxy)
 352                 curl_easy_setopt(curl, CURLOPT_PROXY, session->proxy);
 353
 354         if (debug)
 355                 curl_easy_setopt(curl, CURLOPT_VERBOSE, 1);
 356
 357         dbg("user_password = %s\n", user_password);
 358         dbg("data = %s\n", data);
 359         dbg("proxy = %s\n", session->proxy);
 360
 361         curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, curl_callback);
 362         curl_easy_setopt(curl, CURLOPT_WRITEDATA, curl_buf);
 363         res = curl_easy_perform(curl);
 364         if (res && !session->bash) {
 365                 fprintf(stderr, "error(%d) trying to perform operation\n", res);
 366                 return -EINVAL;
 367         }
 368
 369         curl_easy_cleanup(curl);
 370         if (session->action == ACTION_UPDATE)
 371                 curl_formfree(formpost);
 372         bti_curl_buffer_free(curl_buf);
 373         return 0;
 374 }
 375
 376 static void parse_configfile(struct session *session)
 377 {
 378         FILE *config_file;
 379         char *line = NULL;
 380         size_t len = 0;
 381         char *account = NULL;
 382         char *password = NULL;
 383         char *host = NULL;
 384         char *proxy = NULL;
 385         char *logfile = NULL;
 386         char *action = NULL;
 387         char *file;
 388
 389         /* config file is ~/.bti  */
 390         file = alloca(strlen(session->homedir) + 7);
 391
 392         sprintf(file, "%s/.bti", session->homedir);
 393
 394         config_file = fopen(file, "r");
 395
 396         /* No error if file does not exist or is unreadable.  */
 397         if (config_file == NULL)
 398                 return;
 399
 400         do {
 401                 ssize_t n = getline(&line, &len, config_file);
 402                 if (n < 0)
 403                         break;
 404                 if (line[n - 1] == '\n')
 405                         line[n - 1] = '\0';
 406                 /* Parse file.  Format is the usual value pairs:
 407                    account=name
 408                    passwort=value
 409                    # is a comment character
 410                 */
 411                 *strchrnul(line, '#') = '\0';
 412                 char *c = line;
 413                 while (isspace(*c))
 414                         c++;
 415                 /* Ignore blank lines.  */
 416                 if (c[0] == '\0')
 417                         continue;
 418
 419                 if (!strncasecmp(c, "account", 7) && (c[7] == '=')) {
 420                         c += 8;
 421                         if (c[0] != '\0')
 422                                 account = strdup(c);
 423                 } else if (!strncasecmp(c, "password", 8) &&
 424                            (c[8] == '=')) {
 425                         c += 9;
 426                         if (c[0] != '\0')
 427                                 password = strdup(c);
 428                 } else if (!strncasecmp(c, "host", 4) &&
 429                            (c[4] == '=')) {
 430                         c += 5;
 431                         if (c[0] != '\0')
 432                                 host = strdup(c);
 433                 } else if (!strncasecmp(c, "proxy", 5) &&
 434                            (c[5] == '=')) {
 435                         c += 6;
 436                         if (c[0] != '\0')
 437                                 proxy = strdup(c);
 438                 } else if (!strncasecmp(c, "logfile", 7) &&
 439                            (c[7] == '=')) {
 440                         c += 8;
 441                         if (c[0] != '\0')
 442                                 logfile = strdup(c);
 443                 } else if (!strncasecmp(c, "action", 6) &&
 444                            (c[6] == '=')) {
 445                         c += 7;
 446                         if (c[0] != '\0')
 447                                 action = strdup(c);
 448                 }
 449         } while (!feof(config_file));
 450
 451         if (password)
 452                 session->password = password;
 453         if (account)
 454                 session->account = account;
 455         if (host) {
 456                 if (strcasecmp(host, "twitter") == 0)
 457                         session->host = HOST_TWITTER;
 458                 if (strcasecmp(host, "identica") == 0)
 459                         session->host = HOST_IDENTICA;
 460                 free(host);
 461         }
 462         if (proxy) {
 463                 if (session->proxy)
 464                         free(session->proxy);
 465                 session->proxy = proxy;
 466         }
 467         if (logfile)
 468                 session->logfile = logfile;
 469         if (action) {
 470                 if (strcasecmp(action, "update") == 0)
 471                         session->action = ACTION_UPDATE;
 472                 if (strcasecmp(action, "friends") == 0)
 473                         session->action = ACTION_FRIENDS;
 474                 if (strcasecmp(action, "public") == 0)
 475                         session->action = ACTION_PUBLIC;
 476                 free(action);
 477         }
 478
 479         /* Free buffer and close file.  */
 480         free(line);
 481         fclose(config_file);
 482 }
 483
 484 static void log_session(struct session *session, int retval)
 485 {
 486         FILE *log_file;
 487         char *filename;
 488         char *host;
 489
 490         /* Only log something if we have a log file set */
 491         if (!session->logfile)
 492                 return;
 493
 494         filename = alloca(strlen(session->homedir) +
 495                           strlen(session->logfile) + 3);
 496
 497         sprintf(filename, "%s/%s", session->homedir, session->logfile);
 498
 499         log_file = fopen(filename, "a+");
 500         if (log_file == NULL)
 501                 return;
 502         switch (session->host) {
 503         case HOST_TWITTER:
 504                 host = "twitter";
 505                 break;
 506         case HOST_IDENTICA:
 507                 host = "identi.ca";
 508                 break;
 509         default:
 510                 host = "unknown";
 511                 break;
 512         }
 513
 514         if (session->action == ACTION_UPDATE) {
 515                 if (retval)
 516                         fprintf(log_file, "%s: host=%s tweet failed\n",
 517                                 session->time, host);
 518                 else
 519                         fprintf(log_file, "%s: host=%s tweet=%s\n",
 520                                 session->time, host, session->tweet);
 521         } else if (session->action == ACTION_FRIENDS) {
 522                 fprintf(log_file, "%s: host=%s retrieving friends timeline\n",
 523                         session->time, host);
 524         } else if (session->action == ACTION_PUBLIC) {
 525                 fprintf(log_file, "%s: host=%s retrieving public timeline\n",
 526                         session->time, host);
 527         }
 528
 529         fclose(log_file);
 530 }
 531
 532 int main(int argc, char *argv[], char *envp[])
 533 {
 534         static const struct option options[] = {
 535                 { "debug", 0, NULL, 'd' },
 536                 { "account", 1, NULL, 'a' },
 537                 { "password", 1, NULL, 'p' },
 538                 { "host", 1, NULL, 'H' },
 539                 { "proxy", 1, NULL, 'P' },
 540                 { "action", 1, NULL, 'A' },
 541                 { "logfile", 1, NULL, 'L' },
 542                 { "help", 0, NULL, 'h' },
 543                 { "bash", 0, NULL, 'b' },
 544                 { "version", 0, NULL, 'v' },
 545                 { }
 546         };
 547         struct session *session;
 548         pid_t child;
 549         char *tweet;
 550         int retval = 0;
 551         int option;
 552         char *http_proxy;
 553         time_t t;
 554
 555         debug = 0;
 556         rl_bind_key('\t', rl_insert);
 557
 558         session = session_alloc();
 559         if (!session) {
 560                 fprintf(stderr, "no more memory...\n");
 561                 return -1;
 562         }
 563
 564         /* get the current time so that we can log it later */
 565         time(&t);
 566         session->time = strdup(ctime(&t));
 567         session->time[strlen(session->time)-1] = 0x00;
 568
 569         session->homedir = strdup(getenv("HOME"));
 570
 571         curl_global_init(CURL_GLOBAL_ALL);
 572
 573         /* Set environment variables first, before reading command line options
 574          * or config file values. */
 575         http_proxy = getenv("http_proxy");
 576         if (http_proxy) {
 577                 if (session->proxy)
 578                         free(session->proxy);
 579                 session->proxy = strdup(http_proxy);
 580                 dbg("http_proxy = %s\n", session->proxy);
 581         }
 582
 583         parse_configfile(session);
 584
 585         while (1) {
 586                 option = getopt_long_only(argc, argv, "dqe:p:P:H:a:A:h",
 587                                           options, NULL);
 588                 if (option == -1)
 589                         break;
 590                 switch (option) {
 591                 case 'd':
 592                         debug = 1;
 593                         break;
 594                 case 'a':
 595                         if (session->account)
 596                                 free(session->account);
 597                         session->account = strdup(optarg);
 598                         dbg("account = %s\n", session->account);
 599                         break;
 600                 case 'p':
 601                         if (session->password)
 602                                 free(session->password);
 603                         session->password = strdup(optarg);
 604                         dbg("password = %s\n", session->password);
 605                         break;
 606                 case 'P':
 607                         if (session->proxy)
 608                                 free(session->proxy);
 609                         session->proxy = strdup(optarg);
 610                         dbg("proxy = %s\n", session->proxy);
 611                         break;
 612                 case 'A':
 613                         if (strcasecmp(optarg, "update") == 0)
 614                                 session->action = ACTION_UPDATE;
 615                         if (strcasecmp(optarg, "friends") == 0)
 616                                 session->action = ACTION_FRIENDS;
 617                         if (strcasecmp(optarg, "public") == 0)
 618                                 session->action = ACTION_PUBLIC;
 619                         dbg("action = %d\n", session->action);
 620                         break;
 621                 case 'L':
 622                         if (session->logfile)
 623                                 free(session->logfile);
 624                         session->logfile = strdup(optarg);
 625                         dbg("logfile = %s\n", session->logfile);
 626                         break;
 627                 case 'H':
 628                         if (strcasecmp(optarg, "twitter") == 0)
 629                                 session->host = HOST_TWITTER;
 630                         if (strcasecmp(optarg, "identica") == 0)
 631                                 session->host = HOST_IDENTICA;
 632                         dbg("host = %d\n", session->host);
 633                         break;
 634                 case 'b':
 635                         session->bash = 1;
 636                         break;
 637                 case 'h':
 638                         display_help();
 639                         goto exit;
 640                 case 'v':
 641                         display_version();
 642                         goto exit;
 643                 default:
 644                         display_help();
 645                         goto exit;
 646                 }
 647         }
 648
 649         if (!session->account) {
 650                 fprintf(stdout, "Enter twitter account: ");
 651                 session->account = readline(NULL);
 652         }
 653
 654         if (!session->password) {
 655                 fprintf(stdout, "Enter twitter password: ");
 656                 session->password = readline(NULL);
 657         }
 658
 659         if (session->action == ACTION_UPDATE) {
 660                 if (session->bash)
 661                         tweet = readline(NULL);
 662                 else
 663                         tweet = readline("tweet: ");
 664                 if (!tweet || strlen(tweet) == 0) {
 665                         dbg("no tweet?\n");
 666                         return -1;
 667                 }
 668
 669                 session->tweet = zalloc(strlen(tweet) + 10);
 670                 if (session->bash)
 671                         sprintf(session->tweet, "$ %s", tweet);
 672                 else
 673                         sprintf(session->tweet, "%s", tweet);
 674
 675                 free(tweet);
 676                 dbg("tweet = %s\n", session->tweet);
 677         }
 678
 679         dbg("account = %s\n", session->account);
 680         dbg("password = %s\n", session->password);
 681         dbg("host = %d\n", session->host);
 682         dbg("action = %d\n", session->action);
 683
 684         /* fork ourself so that the main shell can get on
 685          * with it's life as we try to connect and handle everything
 686          */
 687         if (session->bash) {
 688                 child = fork();
 689                 if (child) {
 690                         dbg("child is %d\n", child);
 691                         exit(0);
 692                 }
 693         }
 694
 695         retval = send_request(session);
 696         if (retval && !session->bash)
 697                 fprintf(stderr, "operation failed\n");
 698
 699         log_session(session, retval);
 700 exit:
 701         session_free(session);
 702         return retval;;
 703 }