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 = 0;
  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         int bash;
  58         enum host host;
  59 };
  60
  61 struct bti_curl_buffer {
  62         char *data;
  63         int length;
  64 };
  65
  66 static void display_help(void)
  67 {
  68         fprintf(stdout, "bti - send tweet to twitter\n");
  69         fprintf(stdout, "Version: " BTI_VERSION "\n");
  70         fprintf(stdout, "Usage:\n");
  71         fprintf(stdout, "  bti [options]\n");
  72         fprintf(stdout, "options are:\n");
  73         fprintf(stdout, "  --account accountname\n");
  74         fprintf(stdout, "  --password password\n");
  75         fprintf(stdout, "  --proxy PROXY:PORT\n");
  76         fprintf(stdout, "  --host HOST\n");
  77         fprintf(stdout, "  --bash\n");
  78         fprintf(stdout, "  --debug\n");
  79         fprintf(stdout, "  --version\n");
  80         fprintf(stdout, "  --help\n");
  81 }
  82
  83 static void display_version(void)
  84 {
  85         fprintf(stdout, "bti - version %s\n", BTI_VERSION);
  86 }
  87
  88 static char *get_string_from_stdin(void)
  89 {
  90         static char *string = (char *)NULL;
  91         if (string) {
  92                 free(string);
  93                 string = (char *)NULL;
  94         }
  95
  96         string = readline("tweet: ");
  97
  98         return string;
  99 }
 100
 101 static struct session *session_alloc(void)
 102 {
 103         struct session *session;
 104
 105         session = zalloc(sizeof(*session));
 106         if (!session)
 107                 return NULL;
 108         return session;
 109 }
 110
 111 static void session_free(struct session *session)
 112 {
 113         if (!session)
 114                 return;
 115         free(session->password);
 116         free(session->account);
 117         free(session->tweet);
 118         free(session->proxy);
 119         free(session->time);
 120         free(session->homedir);
 121         free(session);
 122 }
 123
 124 static struct bti_curl_buffer *bti_curl_buffer_alloc(void)
 125 {
 126         struct bti_curl_buffer *buffer;
 127
 128         buffer = zalloc(sizeof(*buffer));
 129         if (!buffer)
 130                 return NULL;
 131
 132         /* start out with a data buffer of 1 byte to
 133          * make the buffer fill logic simpler */
 134         buffer->data = zalloc(1);
 135         if (!buffer->data) {
 136                 free(buffer);
 137                 return NULL;
 138         }
 139         buffer->length = 0;
 140         return buffer;
 141 }
 142
 143 static void bti_curl_buffer_free(struct bti_curl_buffer *buffer)
 144 {
 145         if (!buffer)
 146                 return;
 147         free(buffer->data);
 148         free(buffer);
 149 }
 150
 151 static const char *twitter_url = "https://twitter.com/statuses/update.xml";
 152 static const char *identica_url = "http://identi.ca/api/statuses/update.xml";
 153
 154 static CURL *curl_init(void)
 155 {
 156         CURL *curl;
 157
 158         curl = curl_easy_init();
 159         if (!curl) {
 160                 fprintf(stderr, "Can not init CURL!\n");
 161                 return NULL;
 162         }
 163         /* some ssl sanity checks on the connection we are making */
 164         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0);
 165         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0);
 166         return curl;
 167 }
 168
 169 size_t curl_callback(void *buffer, size_t size, size_t nmemb, void *userp)
 170 {
 171         struct bti_curl_buffer *curl_buf = userp;
 172         size_t buffer_size = size * nmemb;
 173         char *temp;
 174
 175         if ((!buffer) || (!buffer_size) || (!curl_buf))
 176                 return -EINVAL;
 177
 178         /* add to the data we already have */
 179         temp = zalloc(curl_buf->length + buffer_size + 1);
 180         if (!temp)
 181                 return -ENOMEM;
 182
 183         memcpy(temp, curl_buf->data, curl_buf->length);
 184         free(curl_buf->data);
 185         curl_buf->data = temp;
 186         memcpy(&curl_buf->data[curl_buf->length], (char *)buffer, buffer_size);
 187         curl_buf->length += buffer_size;
 188
 189         dbg("%s\n", curl_buf->data);
 190
 191         return buffer_size;
 192 }
 193
 194 static int send_tweet(struct session *session)
 195 {
 196         char user_password[500];
 197         char data[500];
 198         struct bti_curl_buffer *curl_buf;
 199         CURL *curl = NULL;
 200         CURLcode res;
 201         struct curl_httppost *formpost = NULL;
 202         struct curl_httppost *lastptr = NULL;
 203         struct curl_slist *slist = NULL;
 204
 205         if (!session)
 206                 return -EINVAL;
 207
 208         curl_buf = bti_curl_buffer_alloc();
 209         if (!curl_buf)
 210                 return -ENOMEM;
 211
 212         snprintf(user_password, sizeof(user_password), "%s:%s",
 213                  session->account, session->password);
 214         snprintf(data, sizeof(data), "status=\"%s\"", session->tweet);
 215
 216         curl = curl_init();
 217         if (!curl)
 218                 return -EINVAL;
 219
 220         curl_formadd(&formpost, &lastptr,
 221                      CURLFORM_COPYNAME, "status",
 222                      CURLFORM_COPYCONTENTS, session->tweet,
 223                      CURLFORM_END);
 224
 225         curl_easy_setopt(curl, CURLOPT_HTTPPOST, formpost);
 226
 227         switch (session->host) {
 228         case HOST_TWITTER:
 229                 curl_easy_setopt(curl, CURLOPT_URL, twitter_url);
 230                 /*
 231                  * twitter doesn't like the "Expect: 100-continue" header
 232                  * anymore, so turn it off.
 233                  */
 234                 slist = curl_slist_append(slist, "Expect:");
 235                 curl_easy_setopt(curl, CURLOPT_HTTPHEADER, slist);
 236                 break;
 237         case HOST_IDENTICA:
 238                 curl_easy_setopt(curl, CURLOPT_URL, identica_url);
 239                 break;
 240         }
 241
 242         if (session->proxy)
 243                 curl_easy_setopt(curl, CURLOPT_PROXY, session->proxy);
 244
 245         if (debug)
 246                 curl_easy_setopt(curl, CURLOPT_VERBOSE, 1);
 247         curl_easy_setopt(curl, CURLOPT_USERPWD, user_password);
 248
 249         dbg("user_password = %s\n", user_password);
 250         dbg("data = %s\n", data);
 251         dbg("proxy = %s\n", session->proxy);
 252
 253         curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, curl_callback);
 254         curl_easy_setopt(curl, CURLOPT_WRITEDATA, curl_buf);
 255         res = curl_easy_perform(curl);
 256         if (res && !session->bash) {
 257                 fprintf(stderr, "error(%d) trying to send tweet\n", res);
 258                 return -EINVAL;
 259         }
 260
 261         curl_easy_cleanup(curl);
 262         curl_formfree(formpost);
 263         bti_curl_buffer_free(curl_buf);
 264         return 0;
 265 }
 266
 267 static void parse_configfile(struct session *session)
 268 {
 269         FILE *config_file;
 270         char *line = NULL;
 271         size_t len = 0;
 272         char *account = NULL;
 273         char *password = NULL;
 274         char *host = NULL;
 275         char *proxy = NULL;
 276         char *file;
 277
 278         /* config file is ~/.bti  */
 279         file = alloca(strlen(session->homedir) + 7);
 280
 281         sprintf(file, "%s/.bti", session->homedir);
 282
 283         config_file = fopen(file, "r");
 284
 285         /* No error if file does not exist or is unreadable.  */
 286         if (config_file == NULL)
 287                 return;
 288
 289         do {
 290                 ssize_t n = getline(&line, &len, config_file);
 291                 if (n < 0)
 292                         break;
 293                 if (line[n - 1] == '\n')
 294                         line[n - 1] = '\0';
 295                 /* Parse file.  Format is the usual value pairs:
 296                    account=name
 297                    passwort=value
 298                    # is a comment character
 299                 */
 300                 *strchrnul(line, '#') = '\0';
 301                 char *c = line;
 302                 while (isspace(*c))
 303                         c++;
 304                 /* Ignore blank lines.  */
 305                 if (c[0] == '\0')
 306                         continue;
 307
 308                 if (!strncasecmp(c, "account", 7) && (c[7] == '=')) {
 309                         c += 8;
 310                         if (c[0] != '\0')
 311                                 account = strdup(c);
 312                 } else if (!strncasecmp(c, "password", 8) &&
 313                            (c[8] == '=')) {
 314                         c += 9;
 315                         if (c[0] != '\0')
 316                                 password = strdup(c);
 317                 } else if (!strncasecmp(c, "host", 4) &&
 318                            (c[4] == '=')) {
 319                         c += 5;
 320                         if (c[0] != '\0')
 321                                 host = strdup(c);
 322                 } else if (!strncasecmp(c, "proxy", 5) &&
 323                            (c[5] == '=')) {
 324                         c += 6;
 325                         if (c[0] != '\0')
 326                                 proxy = 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
 347         /* Free buffer and close file.  */
 348         free(line);
 349         fclose(config_file);
 350 }
 351
 352 static void log_session(struct session *session, int retval)
 353 {
 354         FILE *log_file;
 355         char *filename;
 356         char *host;
 357
 358         /* logfile is ~/.bti.log  */
 359         filename = alloca(strlen(session->homedir) + 10);
 360
 361         sprintf(filename, "%s/.bti.log", session->homedir);
 362
 363         log_file = fopen(filename, "a+");
 364         if (log_file == NULL)
 365                 return;
 366         switch (session->host) {
 367         case HOST_TWITTER:
 368                 host = "twitter";
 369                 break;
 370         case HOST_IDENTICA:
 371                 host = "identi.ca";
 372                 break;
 373         default:
 374                 host = "unknown";
 375                 break;
 376         }
 377
 378         if (retval)
 379                 fprintf(log_file, "%s: host=%s tweet failed\n", session->time, host);
 380         else
 381                 fprintf(log_file, "%s: host=%s tweet=%s\n", session->time, host, session->tweet);
 382
 383         fclose(log_file);
 384 }
 385
 386 int main(int argc, char *argv[], char *envp[])
 387 {
 388         static const struct option options[] = {
 389                 { "debug", 0, NULL, 'd' },
 390                 { "account", 1, NULL, 'a' },
 391                 { "password", 1, NULL, 'p' },
 392                 { "host", 1, NULL, 'H' },
 393                 { "proxy", 1, NULL, 'P' },
 394                 { "help", 0, NULL, 'h' },
 395                 { "bash", 0, NULL, 'b' },
 396                 { "version", 0, NULL, 'v' },
 397                 { }
 398         };
 399         struct session *session;
 400         pid_t child;
 401         char *tweet;
 402         int retval = 0;
 403         int option;
 404         char *http_proxy;
 405         time_t t;
 406 #if 0
 407         char *pwd = getenv("PWD");
 408         char *dir;
 409 #endif
 410
 411         rl_bind_key('\t', rl_insert);
 412         session = session_alloc();
 413         if (!session) {
 414                 fprintf(stderr, "no more memory...\n");
 415                 return -1;
 416         }
 417
 418         /* get the current time so that we can log it later */
 419         time(&t);
 420         session->time = strdup(ctime(&t));
 421         session->time[strlen(session->time)-1] = 0x00;
 422
 423         session->homedir = strdup(getenv("HOME"));
 424
 425         curl_global_init(CURL_GLOBAL_ALL);
 426
 427         /* Set environment variables first, before reading command line options
 428          * or config file values. */
 429         http_proxy = getenv("http_proxy");
 430         if (http_proxy) {
 431                 if (session->proxy)
 432                         free(session->proxy);
 433                 session->proxy = strdup(http_proxy);
 434                 dbg("http_proxy = %s\n", session->proxy);
 435         }
 436
 437         parse_configfile(session);
 438
 439         while (1) {
 440                 option = getopt_long_only(argc, argv, "dqe:p:P:H:a:h",
 441                                           options, NULL);
 442                 if (option == -1)
 443                         break;
 444                 switch (option) {
 445                 case 'd':
 446                         debug = 1;
 447                         break;
 448                 case 'a':
 449                         if (session->account)
 450                                 free(session->account);
 451                         session->account = strdup(optarg);
 452                         dbg("account = %s\n", session->account);
 453                         break;
 454                 case 'p':
 455                         if (session->password)
 456                                 free(session->password);
 457                         session->password = strdup(optarg);
 458                         dbg("password = %s\n", session->password);
 459                         break;
 460                 case 'P':
 461                         if (session->proxy)
 462                                 free(session->proxy);
 463                         session->proxy = strdup(optarg);
 464                         dbg("proxy = %s\n", session->proxy);
 465                         break;
 466                 case 'H':
 467                         if (strcasecmp(optarg, "twitter") == 0)
 468                                 session->host = HOST_TWITTER;
 469                         if (strcasecmp(optarg, "identica") == 0)
 470                                 session->host = HOST_IDENTICA;
 471                         dbg("host = %d\n", session->host);
 472                         break;
 473                 case 'b':
 474                         session->bash= 1;
 475                         break;
 476                 case 'h':
 477                         display_help();
 478                         goto exit;
 479                 case 'v':
 480                         display_version();
 481                         goto exit;
 482                 default:
 483                         display_help();
 484                         goto exit;
 485                 }
 486         }
 487
 488         if (!session->account) {
 489                 fprintf(stdout, "Enter twitter account: ");
 490                 session->account = get_string_from_stdin();
 491         }
 492
 493         if (!session->password) {
 494                 fprintf(stdout, "Enter twitter password: ");
 495                 session->password = get_string_from_stdin();
 496         }
 497 #if 0
 498         /* get the current working directory basename */
 499         if (strcmp(pwd, home) == 0)
 500                 dir = "~";
 501         else {
 502                 dir = strrchr(pwd, '/');
 503                 if (dir)
 504                         dir++;
 505                 else
 506                         dir = "?";
 507         }
 508 #endif
 509         tweet = get_string_from_stdin();
 510         if (!tweet || strlen(tweet) == 0) {
 511                 dbg("no tweet?\n");
 512                 return -1;
 513         }
 514
 515 //      session->tweet = zalloc(strlen(tweet) + strlen(dir) + 10);
 516         session->tweet = zalloc(strlen(tweet) + 10);
 517
 518         /* if --bash is specified, add the "PWD $ " to
 519          * the start of the tweet. */
 520         if (session->bash)
 521 //              sprintf(session->tweet, "%s $ %s", dir, tweet);
 522                 sprintf(session->tweet, "$ %s", tweet);
 523         else
 524                 sprintf(session->tweet, "%s", tweet);
 525         free(tweet);
 526
 527         dbg("account = %s\n", session->account);
 528         dbg("password = %s\n", session->password);
 529         dbg("tweet = %s\n", session->tweet);
 530         dbg("host = %d\n", session->host);
 531
 532         /* fork ourself so that the main shell can get on
 533          * with it's life as we try to connect and handle everything
 534          */
 535         if (session->bash) {
 536                 child = fork();
 537                         if (child) {
 538                         dbg("child is %d\n", child);
 539                         exit(0);
 540                 }
 541         }
 542
 543         retval = send_tweet(session);
 544         if (retval && !session->bash)
 545                 fprintf(stderr, "tweet failed\n");
 546
 547         log_session(session, retval);
 548 exit:
 549         session_free(session);
 550         return retval;;
 551 }