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 struct session *session_alloc(void)
  91 {
  92         struct session *session;
  93
  94         session = zalloc(sizeof(*session));
  95         if (!session)
  96                 return NULL;
  97         return session;
  98 }
  99
 100 static void session_free(struct session *session)
 101 {
 102         if (!session)
 103                 return;
 104         free(session->password);
 105         free(session->account);
 106         free(session->tweet);
 107         free(session->proxy);
 108         free(session->time);
 109         free(session->homedir);
 110         free(session);
 111 }
 112
 113 static struct bti_curl_buffer *bti_curl_buffer_alloc(void)
 114 {
 115         struct bti_curl_buffer *buffer;
 116
 117         buffer = zalloc(sizeof(*buffer));
 118         if (!buffer)
 119                 return NULL;
 120
 121         /* start out with a data buffer of 1 byte to
 122          * make the buffer fill logic simpler */
 123         buffer->data = zalloc(1);
 124         if (!buffer->data) {
 125                 free(buffer);
 126                 return NULL;
 127         }
 128         buffer->length = 0;
 129         return buffer;
 130 }
 131
 132 static void bti_curl_buffer_free(struct bti_curl_buffer *buffer)
 133 {
 134         if (!buffer)
 135                 return;
 136         free(buffer->data);
 137         free(buffer);
 138 }
 139
 140 static const char *twitter_url = "https://twitter.com/statuses/update.xml";
 141 static const char *identica_url = "http://identi.ca/api/statuses/update.xml";
 142
 143 static CURL *curl_init(void)
 144 {
 145         CURL *curl;
 146
 147         curl = curl_easy_init();
 148         if (!curl) {
 149                 fprintf(stderr, "Can not init CURL!\n");
 150                 return NULL;
 151         }
 152         /* some ssl sanity checks on the connection we are making */
 153         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0);
 154         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0);
 155         return curl;
 156 }
 157
 158 size_t curl_callback(void *buffer, size_t size, size_t nmemb, void *userp)
 159 {
 160         struct bti_curl_buffer *curl_buf = userp;
 161         size_t buffer_size = size * nmemb;
 162         char *temp;
 163
 164         if ((!buffer) || (!buffer_size) || (!curl_buf))
 165                 return -EINVAL;
 166
 167         /* add to the data we already have */
 168         temp = zalloc(curl_buf->length + buffer_size + 1);
 169         if (!temp)
 170                 return -ENOMEM;
 171
 172         memcpy(temp, curl_buf->data, curl_buf->length);
 173         free(curl_buf->data);
 174         curl_buf->data = temp;
 175         memcpy(&curl_buf->data[curl_buf->length], (char *)buffer, buffer_size);
 176         curl_buf->length += buffer_size;
 177
 178         dbg("%s\n", curl_buf->data);
 179
 180         return buffer_size;
 181 }
 182
 183 static int send_tweet(struct session *session)
 184 {
 185         char user_password[500];
 186         char data[500];
 187         struct bti_curl_buffer *curl_buf;
 188         CURL *curl = NULL;
 189         CURLcode res;
 190         struct curl_httppost *formpost = NULL;
 191         struct curl_httppost *lastptr = NULL;
 192         struct curl_slist *slist = NULL;
 193
 194         if (!session)
 195                 return -EINVAL;
 196
 197         curl_buf = bti_curl_buffer_alloc();
 198         if (!curl_buf)
 199                 return -ENOMEM;
 200
 201         snprintf(user_password, sizeof(user_password), "%s:%s",
 202                  session->account, session->password);
 203         snprintf(data, sizeof(data), "status=\"%s\"", session->tweet);
 204
 205         curl = curl_init();
 206         if (!curl)
 207                 return -EINVAL;
 208
 209         curl_formadd(&formpost, &lastptr,
 210                      CURLFORM_COPYNAME, "status",
 211                      CURLFORM_COPYCONTENTS, session->tweet,
 212                      CURLFORM_END);
 213
 214         curl_formadd(&formpost, &lastptr,
 215                      CURLFORM_COPYNAME, "source",
 216                      CURLFORM_COPYCONTENTS, "bti",
 217                      CURLFORM_END);
 218
 219         curl_easy_setopt(curl, CURLOPT_HTTPPOST, formpost);
 220
 221         switch (session->host) {
 222         case HOST_TWITTER:
 223                 curl_easy_setopt(curl, CURLOPT_URL, twitter_url);
 224                 /*
 225                  * twitter doesn't like the "Expect: 100-continue" header
 226                  * anymore, so turn it off.
 227                  */
 228                 slist = curl_slist_append(slist, "Expect:");
 229                 curl_easy_setopt(curl, CURLOPT_HTTPHEADER, slist);
 230                 break;
 231         case HOST_IDENTICA:
 232                 curl_easy_setopt(curl, CURLOPT_URL, identica_url);
 233                 break;
 234         }
 235
 236         if (session->proxy)
 237                 curl_easy_setopt(curl, CURLOPT_PROXY, session->proxy);
 238
 239         if (debug)
 240                 curl_easy_setopt(curl, CURLOPT_VERBOSE, 1);
 241         curl_easy_setopt(curl, CURLOPT_USERPWD, user_password);
 242
 243         dbg("user_password = %s\n", user_password);
 244         dbg("data = %s\n", data);
 245         dbg("proxy = %s\n", session->proxy);
 246
 247         curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, curl_callback);
 248         curl_easy_setopt(curl, CURLOPT_WRITEDATA, curl_buf);
 249         res = curl_easy_perform(curl);
 250         if (res && !session->bash) {
 251                 fprintf(stderr, "error(%d) trying to send tweet\n", res);
 252                 return -EINVAL;
 253         }
 254
 255         curl_easy_cleanup(curl);
 256         curl_formfree(formpost);
 257         bti_curl_buffer_free(curl_buf);
 258         return 0;
 259 }
 260
 261 static void parse_configfile(struct session *session)
 262 {
 263         FILE *config_file;
 264         char *line = NULL;
 265         size_t len = 0;
 266         char *account = NULL;
 267         char *password = NULL;
 268         char *host = NULL;
 269         char *proxy = NULL;
 270         char *logfile = NULL;
 271         char *file;
 272
 273         /* config file is ~/.bti  */
 274         file = alloca(strlen(session->homedir) + 7);
 275
 276         sprintf(file, "%s/.bti", session->homedir);
 277
 278         config_file = fopen(file, "r");
 279
 280         /* No error if file does not exist or is unreadable.  */
 281         if (config_file == NULL)
 282                 return;
 283
 284         do {
 285                 ssize_t n = getline(&line, &len, config_file);
 286                 if (n < 0)
 287                         break;
 288                 if (line[n - 1] == '\n')
 289                         line[n - 1] = '\0';
 290                 /* Parse file.  Format is the usual value pairs:
 291                    account=name
 292                    passwort=value
 293                    # is a comment character
 294                 */
 295                 *strchrnul(line, '#') = '\0';
 296                 char *c = line;
 297                 while (isspace(*c))
 298                         c++;
 299                 /* Ignore blank lines.  */
 300                 if (c[0] == '\0')
 301                         continue;
 302
 303                 if (!strncasecmp(c, "account", 7) && (c[7] == '=')) {
 304                         c += 8;
 305                         if (c[0] != '\0')
 306                                 account = strdup(c);
 307                 } else if (!strncasecmp(c, "password", 8) &&
 308                            (c[8] == '=')) {
 309                         c += 9;
 310                         if (c[0] != '\0')
 311                                 password = strdup(c);
 312                 } else if (!strncasecmp(c, "host", 4) &&
 313                            (c[4] == '=')) {
 314                         c += 5;
 315                         if (c[0] != '\0')
 316                                 host = strdup(c);
 317                 } else if (!strncasecmp(c, "proxy", 5) &&
 318                            (c[5] == '=')) {
 319                         c += 6;
 320                         if (c[0] != '\0')
 321                                 proxy = strdup(c);
 322                 } else if (!strncasecmp(c, "logfile", 7) &&
 323                            (c[7] == '=')) {
 324                         c += 8;
 325                         if (c[0] != '\0')
 326                                 logfile = strdup(c);
 327                 }
 328         } while (!feof(config_file));
 329
 330         if (password)
 331                 session->password = password;
 332         if (account)
 333                 session->account = account;
 334         if (host) {
 335                 if (strcasecmp(host, "twitter") == 0)
 336                         session->host = HOST_TWITTER;
 337                 if (strcasecmp(host, "identica") == 0)
 338                         session->host = HOST_IDENTICA;
 339                 free(host);
 340         }
 341         if (proxy) {
 342                 if (session->proxy)
 343                         free(session->proxy);
 344                 session->proxy = proxy;
 345         }
 346         if (logfile)
 347                 session->logfile = logfile;
 348
 349         /* Free buffer and close file.  */
 350         free(line);
 351         fclose(config_file);
 352 }
 353
 354 static void log_session(struct session *session, int retval)
 355 {
 356         FILE *log_file;
 357         char *filename;
 358         char *host;
 359
 360         /* Only log something if we have a log file set */
 361         if (!session->logfile)
 362                 return;
 363
 364         filename = alloca(strlen(session->homedir) +
 365                           strlen(session->logfile) + 3);
 366
 367         sprintf(filename, "%s/%s", session->homedir, session->logfile);
 368
 369         log_file = fopen(filename, "a+");
 370         if (log_file == NULL)
 371                 return;
 372         switch (session->host) {
 373         case HOST_TWITTER:
 374                 host = "twitter";
 375                 break;
 376         case HOST_IDENTICA:
 377                 host = "identi.ca";
 378                 break;
 379         default:
 380                 host = "unknown";
 381                 break;
 382         }
 383
 384         if (retval)
 385                 fprintf(log_file, "%s: host=%s tweet failed\n",
 386                         session->time, host);
 387         else
 388                 fprintf(log_file, "%s: host=%s tweet=%s\n",
 389                         session->time, host, session->tweet);
 390
 391         fclose(log_file);
 392 }
 393
 394 int main(int argc, char *argv[], char *envp[])
 395 {
 396         static const struct option options[] = {
 397                 { "debug", 0, NULL, 'd' },
 398                 { "account", 1, NULL, 'a' },
 399                 { "password", 1, NULL, 'p' },
 400                 { "host", 1, NULL, 'H' },
 401                 { "proxy", 1, NULL, 'P' },
 402                 { "logfile", 1, NULL, 'L' },
 403                 { "help", 0, NULL, 'h' },
 404                 { "bash", 0, NULL, 'b' },
 405                 { "version", 0, NULL, 'v' },
 406                 { }
 407         };
 408         struct session *session;
 409         pid_t child;
 410         char *tweet;
 411         int retval = 0;
 412         int option;
 413         char *http_proxy;
 414         time_t t;
 415
 416         debug = 0;
 417         rl_bind_key('\t', rl_insert);
 418
 419         session = session_alloc();
 420         if (!session) {
 421                 fprintf(stderr, "no more memory...\n");
 422                 return -1;
 423         }
 424
 425         /* get the current time so that we can log it later */
 426         time(&t);
 427         session->time = strdup(ctime(&t));
 428         session->time[strlen(session->time)-1] = 0x00;
 429
 430         session->homedir = strdup(getenv("HOME"));
 431
 432         curl_global_init(CURL_GLOBAL_ALL);
 433
 434         /* Set environment variables first, before reading command line options
 435          * or config file values. */
 436         http_proxy = getenv("http_proxy");
 437         if (http_proxy) {
 438                 if (session->proxy)
 439                         free(session->proxy);
 440                 session->proxy = strdup(http_proxy);
 441                 dbg("http_proxy = %s\n", session->proxy);
 442         }
 443
 444         parse_configfile(session);
 445
 446         while (1) {
 447                 option = getopt_long_only(argc, argv, "dqe:p:P:H:a:h",
 448                                           options, NULL);
 449                 if (option == -1)
 450                         break;
 451                 switch (option) {
 452                 case 'd':
 453                         debug = 1;
 454                         break;
 455                 case 'a':
 456                         if (session->account)
 457                                 free(session->account);
 458                         session->account = strdup(optarg);
 459                         dbg("account = %s\n", session->account);
 460                         break;
 461                 case 'p':
 462                         if (session->password)
 463                                 free(session->password);
 464                         session->password = strdup(optarg);
 465                         dbg("password = %s\n", session->password);
 466                         break;
 467                 case 'P':
 468                         if (session->proxy)
 469                                 free(session->proxy);
 470                         session->proxy = strdup(optarg);
 471                         dbg("proxy = %s\n", session->proxy);
 472                         break;
 473                 case 'L':
 474                         if (session->logfile)
 475                                 free(session->logfile);
 476                         session->logfile = strdup(optarg);
 477                         dbg("logfile = %s\n", session->logfile);
 478                         break;
 479                 case 'H':
 480                         if (strcasecmp(optarg, "twitter") == 0)
 481                                 session->host = HOST_TWITTER;
 482                         if (strcasecmp(optarg, "identica") == 0)
 483                                 session->host = HOST_IDENTICA;
 484                         dbg("host = %d\n", session->host);
 485                         break;
 486                 case 'b':
 487                         session->bash = 1;
 488                         break;
 489                 case 'h':
 490                         display_help();
 491                         goto exit;
 492                 case 'v':
 493                         display_version();
 494                         goto exit;
 495                 default:
 496                         display_help();
 497                         goto exit;
 498                 }
 499         }
 500
 501         if (!session->account) {
 502                 fprintf(stdout, "Enter twitter account: ");
 503                 session->account = readline(NULL);
 504         }
 505
 506         if (!session->password) {
 507                 fprintf(stdout, "Enter twitter password: ");
 508                 session->password = readline(NULL);
 509         }
 510
 511         if (session->bash)
 512                 tweet = readline(NULL);
 513         else
 514                 tweet = readline("tweet: ");
 515         if (!tweet || strlen(tweet) == 0) {
 516                 dbg("no tweet?\n");
 517                 return -1;
 518         }
 519
 520         session->tweet = zalloc(strlen(tweet) + 10);
 521
 522         /* if --bash is specified, add the "PWD $ " to
 523          * the start of the tweet. */
 524         if (session->bash)
 525                 sprintf(session->tweet, "$ %s", tweet);
 526         else
 527                 sprintf(session->tweet, "%s", tweet);
 528         free(tweet);
 529
 530         dbg("account = %s\n", session->account);
 531         dbg("password = %s\n", session->password);
 532         dbg("tweet = %s\n", session->tweet);
 533         dbg("host = %d\n", session->host);
 534
 535         /* fork ourself so that the main shell can get on
 536          * with it's life as we try to connect and handle everything
 537          */
 538         if (session->bash) {
 539                 child = fork();
 540                         if (child) {
 541                         dbg("child is %d\n", child);
 542                         exit(0);
 543                 }
 544         }
 545
 546         retval = send_tweet(session);
 547         if (retval && !session->bash)
 548                 fprintf(stderr, "tweet failed\n");
 549
 550         log_session(session, retval);
 551 exit:
 552         session_free(session);
 553         return retval;;
 554 }