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 "bti_version.h"
  32
  33
  34 #define zalloc(size)    calloc(size, 1)
  35
  36 #define dbg(format, arg...)                                             \
  37         do {                                                            \
  38                 if (debug)                                              \
  39                         printf("%s: " format , __func__ , ## arg);      \
  40         } while (0)
  41
  42
  43 static int debug;
  44
  45 enum host {
  46         HOST_TWITTER = 0,
  47         HOST_IDENTICA = 1,
  48 };
  49
  50 struct session {
  51         char *password;
  52         char *account;
  53         char *tweet;
  54         char *proxy;
  55         char *time;
  56         char *homedir;
  57         char *logfile;
  58         int bash;
  59         enum host host;
  60 };
  61
  62 struct bti_curl_buffer {
  63         char *data;
  64         int length;
  65 };
  66
  67 static void display_help(void)
  68 {
  69         fprintf(stdout, "bti - send tweet to twitter\n");
  70         fprintf(stdout, "Version: " BTI_VERSION "\n");
  71         fprintf(stdout, "Usage:\n");
  72         fprintf(stdout, "  bti [options]\n");
  73         fprintf(stdout, "options are:\n");
  74         fprintf(stdout, "  --account accountname\n");
  75         fprintf(stdout, "  --password password\n");
  76         fprintf(stdout, "  --proxy PROXY:PORT\n");
  77         fprintf(stdout, "  --host HOST\n");
  78         fprintf(stdout, "  --logfile logfile\n");
  79         fprintf(stdout, "  --bash\n");
  80         fprintf(stdout, "  --debug\n");
  81         fprintf(stdout, "  --version\n");
  82         fprintf(stdout, "  --help\n");
  83 }
  84
  85 static void display_version(void)
  86 {
  87         fprintf(stdout, "bti - version %s\n", BTI_VERSION);
  88 }
  89
  90 static char *get_string_from_stdin(void)
  91 {
  92         static char *string = (char *)NULL;
  93         if (string) {
  94                 free(string);
  95                 string = (char *)NULL;
  96         }
  97
  98         string = readline("tweet: ");
  99
 100         return string;
 101 }
 102
 103 static struct session *session_alloc(void)
 104 {
 105         struct session *session;
 106
 107         session = zalloc(sizeof(*session));
 108         if (!session)
 109                 return NULL;
 110         return session;
 111 }
 112
 113 static void session_free(struct session *session)
 114 {
 115         if (!session)
 116                 return;
 117         free(session->password);
 118         free(session->account);
 119         free(session->tweet);
 120         free(session->proxy);
 121         free(session->time);
 122         free(session->homedir);
 123         free(session);
 124 }
 125
 126 static struct bti_curl_buffer *bti_curl_buffer_alloc(void)
 127 {
 128         struct bti_curl_buffer *buffer;
 129
 130         buffer = zalloc(sizeof(*buffer));
 131         if (!buffer)
 132                 return NULL;
 133
 134         /* start out with a data buffer of 1 byte to
 135          * make the buffer fill logic simpler */
 136         buffer->data = zalloc(1);
 137         if (!buffer->data) {
 138                 free(buffer);
 139                 return NULL;
 140         }
 141         buffer->length = 0;
 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_url = "https://twitter.com/statuses/update.xml";
 154 static const char *identica_url = "http://identi.ca/api/statuses/update.xml";
 155
 156 static CURL *curl_init(void)
 157 {
 158         CURL *curl;
 159
 160         curl = curl_easy_init();
 161         if (!curl) {
 162                 fprintf(stderr, "Can not init CURL!\n");
 163                 return NULL;
 164         }
 165         /* some ssl sanity checks on the connection we are making */
 166         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0);
 167         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0);
 168         return curl;
 169 }
 170
 171 size_t curl_callback(void *buffer, size_t size, size_t nmemb, void *userp)
 172 {
 173         struct bti_curl_buffer *curl_buf = userp;
 174         size_t buffer_size = size * nmemb;
 175         char *temp;
 176
 177         if ((!buffer) || (!buffer_size) || (!curl_buf))
 178                 return -EINVAL;
 179
 180         /* add to the data we already have */
 181         temp = zalloc(curl_buf->length + buffer_size + 1);
 182         if (!temp)
 183                 return -ENOMEM;
 184
 185         memcpy(temp, curl_buf->data, curl_buf->length);
 186         free(curl_buf->data);
 187         curl_buf->data = temp;
 188         memcpy(&curl_buf->data[curl_buf->length], (char *)buffer, buffer_size);
 189         curl_buf->length += buffer_size;
 190
 191         dbg("%s\n", curl_buf->data);
 192
 193         return buffer_size;
 194 }
 195
 196 static int send_tweet(struct session *session)
 197 {
 198         char user_password[500];
 199         char data[500];
 200         struct bti_curl_buffer *curl_buf;
 201         CURL *curl = NULL;
 202         CURLcode res;
 203         struct curl_httppost *formpost = NULL;
 204         struct curl_httppost *lastptr = NULL;
 205         struct curl_slist *slist = NULL;
 206
 207         if (!session)
 208                 return -EINVAL;
 209
 210         curl_buf = bti_curl_buffer_alloc();
 211         if (!curl_buf)
 212                 return -ENOMEM;
 213
 214         snprintf(user_password, sizeof(user_password), "%s:%s",
 215                  session->account, session->password);
 216         snprintf(data, sizeof(data), "status=\"%s\"", session->tweet);
 217
 218         curl = curl_init();
 219         if (!curl)
 220                 return -EINVAL;
 221
 222         curl_formadd(&formpost, &lastptr,
 223                      CURLFORM_COPYNAME, "status",
 224                      CURLFORM_COPYCONTENTS, session->tweet,
 225                      CURLFORM_END);
 226
 227         curl_formadd(&formpost, &lastptr,
 228                      CURLFORM_COPYNAME, "source",
 229                      CURLFORM_COPYCONTENTS, "bti",
 230                      CURLFORM_END);
 231
 232         curl_easy_setopt(curl, CURLOPT_HTTPPOST, formpost);
 233
 234         switch (session->host) {
 235         case HOST_TWITTER:
 236                 curl_easy_setopt(curl, CURLOPT_URL, twitter_url);
 237                 /*
 238                  * twitter doesn't like the "Expect: 100-continue" header
 239                  * anymore, so turn it off.
 240                  */
 241                 slist = curl_slist_append(slist, "Expect:");
 242                 curl_easy_setopt(curl, CURLOPT_HTTPHEADER, slist);
 243                 break;
 244         case HOST_IDENTICA:
 245                 curl_easy_setopt(curl, CURLOPT_URL, identica_url);
 246                 break;
 247         }
 248
 249         if (session->proxy)
 250                 curl_easy_setopt(curl, CURLOPT_PROXY, session->proxy);
 251
 252         if (debug)
 253                 curl_easy_setopt(curl, CURLOPT_VERBOSE, 1);
 254         curl_easy_setopt(curl, CURLOPT_USERPWD, user_password);
 255
 256         dbg("user_password = %s\n", user_password);
 257         dbg("data = %s\n", data);
 258         dbg("proxy = %s\n", session->proxy);
 259
 260         curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, curl_callback);
 261         curl_easy_setopt(curl, CURLOPT_WRITEDATA, curl_buf);
 262         res = curl_easy_perform(curl);
 263         if (res && !session->bash) {
 264                 fprintf(stderr, "error(%d) trying to send tweet\n", res);
 265                 return -EINVAL;
 266         }
 267
 268         curl_easy_cleanup(curl);
 269         curl_formfree(formpost);
 270         bti_curl_buffer_free(curl_buf);
 271         return 0;
 272 }
 273
 274 static void parse_configfile(struct session *session)
 275 {
 276         FILE *config_file;
 277         char *line = NULL;
 278         size_t len = 0;
 279         char *account = NULL;
 280         char *password = NULL;
 281         char *host = NULL;
 282         char *proxy = NULL;
 283         char *logfile = NULL;
 284         char *file;
 285
 286         /* config file is ~/.bti  */
 287         file = alloca(strlen(session->homedir) + 7);
 288
 289         sprintf(file, "%s/.bti", session->homedir);
 290
 291         config_file = fopen(file, "r");
 292
 293         /* No error if file does not exist or is unreadable.  */
 294         if (config_file == NULL)
 295                 return;
 296
 297         do {
 298                 ssize_t n = getline(&line, &len, config_file);
 299                 if (n < 0)
 300                         break;
 301                 if (line[n - 1] == '\n')
 302                         line[n - 1] = '\0';
 303                 /* Parse file.  Format is the usual value pairs:
 304                    account=name
 305                    passwort=value
 306                    # is a comment character
 307                 */
 308                 *strchrnul(line, '#') = '\0';
 309                 char *c = line;
 310                 while (isspace(*c))
 311                         c++;
 312                 /* Ignore blank lines.  */
 313                 if (c[0] == '\0')
 314                         continue;
 315
 316                 if (!strncasecmp(c, "account", 7) && (c[7] == '=')) {
 317                         c += 8;
 318                         if (c[0] != '\0')
 319                                 account = strdup(c);
 320                 } else if (!strncasecmp(c, "password", 8) &&
 321                            (c[8] == '=')) {
 322                         c += 9;
 323                         if (c[0] != '\0')
 324                                 password = strdup(c);
 325                 } else if (!strncasecmp(c, "host", 4) &&
 326                            (c[4] == '=')) {
 327                         c += 5;
 328                         if (c[0] != '\0')
 329                                 host = strdup(c);
 330                 } else if (!strncasecmp(c, "proxy", 5) &&
 331                            (c[5] == '=')) {
 332                         c += 6;
 333                         if (c[0] != '\0')
 334                                 proxy = strdup(c);
 335                 } else if (!strncasecmp(c, "logfile", 7) &&
 336                            (c[7] == '=')) {
 337                         c += 8;
 338                         if (c[0] != '\0')
 339                                 logfile = strdup(c);
 340                 }
 341         } while (!feof(config_file));
 342
 343         if (password)
 344                 session->password = password;
 345         if (account)
 346                 session->account = account;
 347         if (host) {
 348                 if (strcasecmp(host, "twitter") == 0)
 349                         session->host = HOST_TWITTER;
 350                 if (strcasecmp(host, "identica") == 0)
 351                         session->host = HOST_IDENTICA;
 352                 free(host);
 353         }
 354         if (proxy) {
 355                 if (session->proxy)
 356                         free(session->proxy);
 357                 session->proxy = proxy;
 358         }
 359         if (logfile)
 360                 session->logfile = logfile;
 361
 362         /* Free buffer and close file.  */
 363         free(line);
 364         fclose(config_file);
 365 }
 366
 367 static void log_session(struct session *session, int retval)
 368 {
 369         FILE *log_file;
 370         char *filename;
 371         char *host;
 372
 373         /* Only log something if we have a log file set */
 374         if (!session->logfile)
 375                 return;
 376
 377         filename = alloca(strlen(session->homedir) +
 378                           strlen(session->logfile) + 3);
 379
 380         sprintf(filename, "%s/%s", session->homedir, session->logfile);
 381
 382         log_file = fopen(filename, "a+");
 383         if (log_file == NULL)
 384                 return;
 385         switch (session->host) {
 386         case HOST_TWITTER:
 387                 host = "twitter";
 388                 break;
 389         case HOST_IDENTICA:
 390                 host = "identi.ca";
 391                 break;
 392         default:
 393                 host = "unknown";
 394                 break;
 395         }
 396
 397         if (retval)
 398                 fprintf(log_file, "%s: host=%s tweet failed\n",
 399                         session->time, host);
 400         else
 401                 fprintf(log_file, "%s: host=%s tweet=%s\n",
 402                         session->time, host, session->tweet);
 403
 404         fclose(log_file);
 405 }
 406
 407 int main(int argc, char *argv[], char *envp[])
 408 {
 409         static const struct option options[] = {
 410                 { "debug", 0, NULL, 'd' },
 411                 { "account", 1, NULL, 'a' },
 412                 { "password", 1, NULL, 'p' },
 413                 { "host", 1, NULL, 'H' },
 414                 { "proxy", 1, NULL, 'P' },
 415                 { "logfile", 1, NULL, 'L' },
 416                 { "help", 0, NULL, 'h' },
 417                 { "bash", 0, NULL, 'b' },
 418                 { "version", 0, NULL, 'v' },
 419                 { }
 420         };
 421         struct session *session;
 422         pid_t child;
 423         char *tweet;
 424         int retval = 0;
 425         int option;
 426         char *http_proxy;
 427         time_t t;
 428
 429         debug = 0;
 430         rl_bind_key('\t', rl_insert);
 431
 432         session = session_alloc();
 433         if (!session) {
 434                 fprintf(stderr, "no more memory...\n");
 435                 return -1;
 436         }
 437
 438         /* get the current time so that we can log it later */
 439         time(&t);
 440         session->time = strdup(ctime(&t));
 441         session->time[strlen(session->time)-1] = 0x00;
 442
 443         session->homedir = strdup(getenv("HOME"));
 444
 445         curl_global_init(CURL_GLOBAL_ALL);
 446
 447         /* Set environment variables first, before reading command line options
 448          * or config file values. */
 449         http_proxy = getenv("http_proxy");
 450         if (http_proxy) {
 451                 if (session->proxy)
 452                         free(session->proxy);
 453                 session->proxy = strdup(http_proxy);
 454                 dbg("http_proxy = %s\n", session->proxy);
 455         }
 456
 457         parse_configfile(session);
 458
 459         while (1) {
 460                 option = getopt_long_only(argc, argv, "dqe:p:P:H:a:h",
 461                                           options, NULL);
 462                 if (option == -1)
 463                         break;
 464                 switch (option) {
 465                 case 'd':
 466                         debug = 1;
 467                         break;
 468                 case 'a':
 469                         if (session->account)
 470                                 free(session->account);
 471                         session->account = strdup(optarg);
 472                         dbg("account = %s\n", session->account);
 473                         break;
 474                 case 'p':
 475                         if (session->password)
 476                                 free(session->password);
 477                         session->password = strdup(optarg);
 478                         dbg("password = %s\n", session->password);
 479                         break;
 480                 case 'P':
 481                         if (session->proxy)
 482                                 free(session->proxy);
 483                         session->proxy = strdup(optarg);
 484                         dbg("proxy = %s\n", session->proxy);
 485                         break;
 486                 case 'L':
 487                         if (session->logfile)
 488                                 free(session->logfile);
 489                         session->logfile = strdup(optarg);
 490                         dbg("logfile = %s\n", session->logfile);
 491                         break;
 492                 case 'H':
 493                         if (strcasecmp(optarg, "twitter") == 0)
 494                                 session->host = HOST_TWITTER;
 495                         if (strcasecmp(optarg, "identica") == 0)
 496                                 session->host = HOST_IDENTICA;
 497                         dbg("host = %d\n", session->host);
 498                         break;
 499                 case 'b':
 500                         session->bash = 1;
 501                         break;
 502                 case 'h':
 503                         display_help();
 504                         goto exit;
 505                 case 'v':
 506                         display_version();
 507                         goto exit;
 508                 default:
 509                         display_help();
 510                         goto exit;
 511                 }
 512         }
 513
 514         if (!session->account) {
 515                 fprintf(stdout, "Enter twitter account: ");
 516                 session->account = get_string_from_stdin();
 517         }
 518
 519         if (!session->password) {
 520                 fprintf(stdout, "Enter twitter password: ");
 521                 session->password = get_string_from_stdin();
 522         }
 523
 524         tweet = get_string_from_stdin();
 525         if (!tweet || strlen(tweet) == 0) {
 526                 dbg("no tweet?\n");
 527                 return -1;
 528         }
 529
 530         session->tweet = zalloc(strlen(tweet) + 10);
 531
 532         /* if --bash is specified, add the "PWD $ " to
 533          * the start of the tweet. */
 534         if (session->bash)
 535                 sprintf(session->tweet, "$ %s", tweet);
 536         else
 537                 sprintf(session->tweet, "%s", tweet);
 538         free(tweet);
 539
 540         dbg("account = %s\n", session->account);
 541         dbg("password = %s\n", session->password);
 542         dbg("tweet = %s\n", session->tweet);
 543         dbg("host = %d\n", session->host);
 544
 545         /* fork ourself so that the main shell can get on
 546          * with it's life as we try to connect and handle everything
 547          */
 548         if (session->bash) {
 549                 child = fork();
 550                         if (child) {
 551                         dbg("child is %d\n", child);
 552                         exit(0);
 553                 }
 554         }
 555
 556         retval = send_tweet(session);
 557         if (retval && !session->bash)
 558                 fprintf(stderr, "tweet failed\n");
 559
 560         log_session(session, retval);
 561 exit:
 562         session_free(session);
 563         return retval;;
 564 }