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;
 179         xmlChar *user;
 180         xmlNodePtr userinfo;
 181         current = current->xmlChildrenNode;
 182         while (current != NULL) {
 183                 if (current->type == XML_ELEMENT_NODE) {
 184                         if (!xmlStrcmp(current->name, (const xmlChar *)"text")) {
 185                                 text = xmlNodeListGetString(doc, current->xmlChildrenNode, 1);
 186                                 printf("%s", text);
 187                                 xmlFree(text);
 188                         }
 189                         if (!xmlStrcmp(current->name, (const xmlChar *)"user")) {
 190                                 userinfo = current->xmlChildrenNode;
 191                                 while (userinfo != NULL) {
 192                                         if ((!xmlStrcmp(userinfo->name, (const xmlChar *)"screen_name"))) {
 193                                                 user = xmlNodeListGetString(doc, userinfo->xmlChildrenNode, 1);
 194                                                 printf(" [%s]\n", user);
 195                                                 xmlFree(user);
 196                                         }
 197
 198                                         userinfo = userinfo->next;
 199                                 }
 200                         }
 201                 }
 202
 203                 current = current->next;
 204         }
 205
 206         return;
 207 }
 208
 209 static void parse_timeline(char *document)
 210 {
 211         xmlDocPtr doc;
 212         xmlNodePtr current;
 213         doc = xmlReadMemory(document, strlen(document), "timeline.xml", NULL, XML_PARSE_NOERROR);
 214
 215         if (doc == NULL)
 216                 return;
 217
 218         current = xmlDocGetRootElement(doc);
 219         if (current == NULL) {
 220                 fprintf(stderr, "empty document\n");
 221                 xmlFreeDoc(doc);
 222                 return;
 223         }
 224
 225         if (xmlStrcmp(current->name, (const xmlChar *) "statuses")) {
 226                 fprintf(stderr, "unexpected document type\n");
 227                 xmlFreeDoc(doc);
 228                 return;
 229         }
 230
 231         current = current->xmlChildrenNode;
 232         while (current != NULL) {
 233                 if ((!xmlStrcmp(current->name, (const xmlChar *)"status")))
 234                         parse_statuses(doc, current);
 235                 current = current->next;
 236         }
 237         xmlFreeDoc(doc);
 238
 239         return;
 240 }
 241
 242 size_t curl_callback(void *buffer, size_t size, size_t nmemb, void *userp)
 243 {
 244         struct bti_curl_buffer *curl_buf = userp;
 245         size_t buffer_size = size * nmemb;
 246         char *temp;
 247
 248         if ((!buffer) || (!buffer_size) || (!curl_buf))
 249                 return -EINVAL;
 250
 251         /* add to the data we already have */
 252         temp = zalloc(curl_buf->length + buffer_size + 1);
 253         if (!temp)
 254                 return -ENOMEM;
 255
 256         memcpy(temp, curl_buf->data, curl_buf->length);
 257         free(curl_buf->data);
 258         curl_buf->data = temp;
 259         memcpy(&curl_buf->data[curl_buf->length], (char *)buffer, buffer_size);
 260         curl_buf->length += buffer_size;
 261         if ((curl_buf->action == ACTION_FRIENDS) ||
 262                 (curl_buf->action == ACTION_PUBLIC))
 263                 parse_timeline(curl_buf->data);
 264
 265         dbg("%s\n", curl_buf->data);
 266
 267         return buffer_size;
 268 }
 269
 270 static int send_request(struct session *session)
 271 {
 272         char user_password[500];
 273         char data[500];
 274         struct bti_curl_buffer *curl_buf;
 275         CURL *curl = NULL;
 276         CURLcode res;
 277         struct curl_httppost *formpost = NULL;
 278         struct curl_httppost *lastptr = NULL;
 279         struct curl_slist *slist = NULL;
 280
 281         if (!session)
 282                 return -EINVAL;
 283
 284         curl_buf = bti_curl_buffer_alloc(session->action);
 285         if (!curl_buf)
 286                 return -ENOMEM;
 287
 288         curl = curl_init();
 289         if (!curl)
 290                 return -EINVAL;
 291
 292         switch (session->action) {
 293         case ACTION_UPDATE:
 294                 snprintf(user_password, sizeof(user_password), "%s:%s",
 295                          session->account, session->password);
 296                 snprintf(data, sizeof(data), "status=\"%s\"", session->tweet);
 297                 curl_formadd(&formpost, &lastptr,
 298                              CURLFORM_COPYNAME, "status",
 299                              CURLFORM_COPYCONTENTS, session->tweet,
 300                              CURLFORM_END);
 301
 302                 curl_formadd(&formpost, &lastptr,
 303                              CURLFORM_COPYNAME, "source",
 304                              CURLFORM_COPYCONTENTS, "bti",
 305                              CURLFORM_END);
 306
 307                 curl_easy_setopt(curl, CURLOPT_HTTPPOST, formpost);
 308                 slist = curl_slist_append(slist, "Expect:");
 309                 curl_easy_setopt(curl, CURLOPT_HTTPHEADER, slist);
 310                 switch (session->host) {
 311                 case HOST_TWITTER:
 312                         curl_easy_setopt(curl, CURLOPT_URL, twitter_update_url);
 313                         break;
 314                 case HOST_IDENTICA:
 315                         curl_easy_setopt(curl, CURLOPT_URL, identica_update_url);
 316                         break;
 317                 }
 318                 curl_easy_setopt(curl, CURLOPT_USERPWD, user_password);
 319
 320                 break;
 321         case ACTION_FRIENDS:
 322                 snprintf(user_password, sizeof(user_password), "%s:%s",
 323                          session->account, session->password);
 324                 switch (session->host) {
 325                 case HOST_TWITTER:
 326                         curl_easy_setopt(curl, CURLOPT_URL, twitter_friends_url);
 327                         break;
 328                 case HOST_IDENTICA:
 329                         curl_easy_setopt(curl, CURLOPT_URL, identica_friends_url);
 330                         break;
 331                 }
 332                 curl_easy_setopt(curl, CURLOPT_USERPWD, user_password);
 333
 334                 break;
 335         case ACTION_PUBLIC:
 336                 switch (session->host) {
 337                 case HOST_TWITTER:
 338                         curl_easy_setopt(curl, CURLOPT_URL, twitter_public_url);
 339                         break;
 340                 case HOST_IDENTICA:
 341                         curl_easy_setopt(curl, CURLOPT_URL, identica_public_url);
 342                         break;
 343                 }
 344
 345                 break;
 346         }
 347
 348         if (session->proxy)
 349                 curl_easy_setopt(curl, CURLOPT_PROXY, session->proxy);
 350
 351         if (debug)
 352                 curl_easy_setopt(curl, CURLOPT_VERBOSE, 1);
 353
 354         dbg("user_password = %s\n", user_password);
 355         dbg("data = %s\n", data);
 356         dbg("proxy = %s\n", session->proxy);
 357
 358         curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, curl_callback);
 359         curl_easy_setopt(curl, CURLOPT_WRITEDATA, curl_buf);
 360         res = curl_easy_perform(curl);
 361         if (res && !session->bash) {
 362                 fprintf(stderr, "error(%d) trying to perform operation\n", res);
 363                 return -EINVAL;
 364         }
 365
 366         curl_easy_cleanup(curl);
 367         if (session->action == ACTION_UPDATE)
 368                 curl_formfree(formpost);
 369         bti_curl_buffer_free(curl_buf);
 370         return 0;
 371 }
 372
 373 static void parse_configfile(struct session *session)
 374 {
 375         FILE *config_file;
 376         char *line = NULL;
 377         size_t len = 0;
 378         char *account = NULL;
 379         char *password = NULL;
 380         char *host = NULL;
 381         char *proxy = NULL;
 382         char *logfile = NULL;
 383         char *action = NULL;
 384         char *file;
 385
 386         /* config file is ~/.bti  */
 387         file = alloca(strlen(session->homedir) + 7);
 388
 389         sprintf(file, "%s/.bti", session->homedir);
 390
 391         config_file = fopen(file, "r");
 392
 393         /* No error if file does not exist or is unreadable.  */
 394         if (config_file == NULL)
 395                 return;
 396
 397         do {
 398                 ssize_t n = getline(&line, &len, config_file);
 399                 if (n < 0)
 400                         break;
 401                 if (line[n - 1] == '\n')
 402                         line[n - 1] = '\0';
 403                 /* Parse file.  Format is the usual value pairs:
 404                    account=name
 405                    passwort=value
 406                    # is a comment character
 407                 */
 408                 *strchrnul(line, '#') = '\0';
 409                 char *c = line;
 410                 while (isspace(*c))
 411                         c++;
 412                 /* Ignore blank lines.  */
 413                 if (c[0] == '\0')
 414                         continue;
 415
 416                 if (!strncasecmp(c, "account", 7) && (c[7] == '=')) {
 417                         c += 8;
 418                         if (c[0] != '\0')
 419                                 account = strdup(c);
 420                 } else if (!strncasecmp(c, "password", 8) &&
 421                            (c[8] == '=')) {
 422                         c += 9;
 423                         if (c[0] != '\0')
 424                                 password = strdup(c);
 425                 } else if (!strncasecmp(c, "host", 4) &&
 426                            (c[4] == '=')) {
 427                         c += 5;
 428                         if (c[0] != '\0')
 429                                 host = strdup(c);
 430                 } else if (!strncasecmp(c, "proxy", 5) &&
 431                            (c[5] == '=')) {
 432                         c += 6;
 433                         if (c[0] != '\0')
 434                                 proxy = strdup(c);
 435                 } else if (!strncasecmp(c, "logfile", 7) &&
 436                            (c[7] == '=')) {
 437                         c += 8;
 438                         if (c[0] != '\0')
 439                                 logfile = strdup(c);
 440                 } else if (!strncasecmp(c, "action", 6) &&
 441                            (c[6] == '=')) {
 442                         c += 7;
 443                         if (c[0] != '\0')
 444                                 action = strdup(c);
 445                 }
 446         } while (!feof(config_file));
 447
 448         if (password)
 449                 session->password = password;
 450         if (account)
 451                 session->account = account;
 452         if (host) {
 453                 if (strcasecmp(host, "twitter") == 0)
 454                         session->host = HOST_TWITTER;
 455                 if (strcasecmp(host, "identica") == 0)
 456                         session->host = HOST_IDENTICA;
 457                 free(host);
 458         }
 459         if (proxy) {
 460                 if (session->proxy)
 461                         free(session->proxy);
 462                 session->proxy = proxy;
 463         }
 464         if (logfile)
 465                 session->logfile = logfile;
 466         if (action) {
 467                 if (strcasecmp(action, "update") == 0)
 468                         session->action = ACTION_UPDATE;
 469                 if (strcasecmp(action, "friends") == 0)
 470                         session->action = ACTION_FRIENDS;
 471                 if (strcasecmp(action, "public") == 0)
 472                         session->action = ACTION_PUBLIC;
 473                 free(action);
 474         }
 475
 476         /* Free buffer and close file.  */
 477         free(line);
 478         fclose(config_file);
 479 }
 480
 481 static void log_session(struct session *session, int retval)
 482 {
 483         FILE *log_file;
 484         char *filename;
 485         char *host;
 486
 487         /* Only log something if we have a log file set */
 488         if (!session->logfile)
 489                 return;
 490
 491         filename = alloca(strlen(session->homedir) +
 492                           strlen(session->logfile) + 3);
 493
 494         sprintf(filename, "%s/%s", session->homedir, session->logfile);
 495
 496         log_file = fopen(filename, "a+");
 497         if (log_file == NULL)
 498                 return;
 499         switch (session->host) {
 500         case HOST_TWITTER:
 501                 host = "twitter";
 502                 break;
 503         case HOST_IDENTICA:
 504                 host = "identi.ca";
 505                 break;
 506         default:
 507                 host = "unknown";
 508                 break;
 509         }
 510
 511         if (session->action == ACTION_UPDATE) {
 512                 if (retval)
 513                         fprintf(log_file, "%s: host=%s tweet failed\n",
 514                                 session->time, host);
 515                 else
 516                         fprintf(log_file, "%s: host=%s tweet=%s\n",
 517                                 session->time, host, session->tweet);
 518         } else if (session->action == ACTION_FRIENDS) {
 519                 fprintf(log_file, "%s: host=%s retrieving friends timeline\n",
 520                         session->time, host);
 521         } else if (session->action == ACTION_PUBLIC) {
 522                 fprintf(log_file, "%s: host=%s retrieving public timeline\n",
 523                         session->time, host);
 524         }
 525
 526         fclose(log_file);
 527 }
 528
 529 int main(int argc, char *argv[], char *envp[])
 530 {
 531         static const struct option options[] = {
 532                 { "debug", 0, NULL, 'd' },
 533                 { "account", 1, NULL, 'a' },
 534                 { "password", 1, NULL, 'p' },
 535                 { "host", 1, NULL, 'H' },
 536                 { "proxy", 1, NULL, 'P' },
 537                 { "action", 1, NULL, 'A' },
 538                 { "logfile", 1, NULL, 'L' },
 539                 { "help", 0, NULL, 'h' },
 540                 { "bash", 0, NULL, 'b' },
 541                 { "version", 0, NULL, 'v' },
 542                 { }
 543         };
 544         struct session *session;
 545         pid_t child;
 546         char *tweet;
 547         int retval = 0;
 548         int option;
 549         char *http_proxy;
 550         time_t t;
 551
 552         debug = 0;
 553         rl_bind_key('\t', rl_insert);
 554
 555         session = session_alloc();
 556         if (!session) {
 557                 fprintf(stderr, "no more memory...\n");
 558                 return -1;
 559         }
 560
 561         /* get the current time so that we can log it later */
 562         time(&t);
 563         session->time = strdup(ctime(&t));
 564         session->time[strlen(session->time)-1] = 0x00;
 565
 566         session->homedir = strdup(getenv("HOME"));
 567
 568         curl_global_init(CURL_GLOBAL_ALL);
 569
 570         /* Set environment variables first, before reading command line options
 571          * or config file values. */
 572         http_proxy = getenv("http_proxy");
 573         if (http_proxy) {
 574                 if (session->proxy)
 575                         free(session->proxy);
 576                 session->proxy = strdup(http_proxy);
 577                 dbg("http_proxy = %s\n", session->proxy);
 578         }
 579
 580         parse_configfile(session);
 581
 582         while (1) {
 583                 option = getopt_long_only(argc, argv, "dqe:p:P:H:a:A:h",
 584                                           options, NULL);
 585                 if (option == -1)
 586                         break;
 587                 switch (option) {
 588                 case 'd':
 589                         debug = 1;
 590                         break;
 591                 case 'a':
 592                         if (session->account)
 593                                 free(session->account);
 594                         session->account = strdup(optarg);
 595                         dbg("account = %s\n", session->account);
 596                         break;
 597                 case 'p':
 598                         if (session->password)
 599                                 free(session->password);
 600                         session->password = strdup(optarg);
 601                         dbg("password = %s\n", session->password);
 602                         break;
 603                 case 'P':
 604                         if (session->proxy)
 605                                 free(session->proxy);
 606                         session->proxy = strdup(optarg);
 607                         dbg("proxy = %s\n", session->proxy);
 608                         break;
 609                 case 'A':
 610                         if (strcasecmp(optarg, "update") == 0)
 611                                 session->action = ACTION_UPDATE;
 612                         if (strcasecmp(optarg, "friends") == 0)
 613                                 session->action = ACTION_FRIENDS;
 614                         if (strcasecmp(optarg, "public") == 0)
 615                                 session->action = ACTION_PUBLIC;
 616                         dbg("action = %d\n", session->action);
 617                         break;
 618                 case 'L':
 619                         if (session->logfile)
 620                                 free(session->logfile);
 621                         session->logfile = strdup(optarg);
 622                         dbg("logfile = %s\n", session->logfile);
 623                         break;
 624                 case 'H':
 625                         if (strcasecmp(optarg, "twitter") == 0)
 626                                 session->host = HOST_TWITTER;
 627                         if (strcasecmp(optarg, "identica") == 0)
 628                                 session->host = HOST_IDENTICA;
 629                         dbg("host = %d\n", session->host);
 630                         break;
 631                 case 'b':
 632                         session->bash = 1;
 633                         break;
 634                 case 'h':
 635                         display_help();
 636                         goto exit;
 637                 case 'v':
 638                         display_version();
 639                         goto exit;
 640                 default:
 641                         display_help();
 642                         goto exit;
 643                 }
 644         }
 645
 646         if (!session->account) {
 647                 fprintf(stdout, "Enter twitter account: ");
 648                 session->account = readline(NULL);
 649         }
 650
 651         if (!session->password) {
 652                 fprintf(stdout, "Enter twitter password: ");
 653                 session->password = readline(NULL);
 654         }
 655
 656         if (session->action == ACTION_UPDATE) {
 657                 if (session->bash)
 658                         tweet = readline(NULL);
 659                 else
 660                         tweet = readline("tweet: ");
 661                 if (!tweet || strlen(tweet) == 0) {
 662                         dbg("no tweet?\n");
 663                         return -1;
 664                 }
 665
 666                 session->tweet = zalloc(strlen(tweet) + 10);
 667                 if (session->bash)
 668                         sprintf(session->tweet, "$ %s", tweet);
 669                 else
 670                         sprintf(session->tweet, "%s", tweet);
 671
 672                 free(tweet);
 673                 dbg("tweet = %s\n", session->tweet);
 674         }
 675
 676         dbg("account = %s\n", session->account);
 677         dbg("password = %s\n", session->password);
 678         dbg("host = %d\n", session->host);
 679         dbg("action = %d\n", session->action);
 680
 681         /* fork ourself so that the main shell can get on
 682          * with it's life as we try to connect and handle everything
 683          */
 684         if (session->bash) {
 685                 child = fork();
 686                 if (child) {
 687                         dbg("child is %d\n", child);
 688                         exit(0);
 689                 }
 690         }
 691
 692         retval = send_request(session);
 693         if (retval && !session->bash)
 694                 fprintf(stderr, "operation failed\n");
 695
 696         log_session(session, retval);
 697 exit:
 698         session_free(session);
 699         return retval;;
 700 }