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 <sys/stat.h>
  28 #include <curl/curl.h>
  29 #include "bti_version.h"
  30
  31
  32 #define zalloc(size)    calloc(size, 1)
  33
  34 #define dbg(format, arg...)                                             \
  35         do {                                                            \
  36                 if (debug)                                              \
  37                         printf("%s: " format , __func__ , ## arg );     \
  38         } while (0)
  39
  40
  41 static int debug = 0;
  42
  43 enum host {
  44         HOST_TWITTER = 0,
  45         HOST_IDENTICA = 1,
  46 };
  47
  48 struct session {
  49         char *password;
  50         char *account;
  51         char *tweet;
  52         char *proxy;
  53         int bash;
  54         enum host host;
  55 };
  56
  57 struct bti_curl_buffer {
  58         char *data;
  59         int length;
  60 };
  61
  62 static void display_help(void)
  63 {
  64         fprintf(stdout, "bti - send tweet to twitter\n");
  65         fprintf(stdout, "Version: " BTI_VERSION "\n");
  66         fprintf(stdout, "Usage:\n");
  67         fprintf(stdout, "  bti [options]\n");
  68         fprintf(stdout, "options are:\n");
  69         fprintf(stdout, "  --account accountname\n");
  70         fprintf(stdout, "  --password password\n");
  71         fprintf(stdout, "  --proxy PROXY:PORT\n");
  72         fprintf(stdout, "  --host HOST\n");
  73         fprintf(stdout, "  --bash\n");
  74         fprintf(stdout, "  --debug\n");
  75         fprintf(stdout, "  --version\n");
  76         fprintf(stdout, "  --help\n");
  77 }
  78
  79 static void display_version(void)
  80 {
  81         fprintf(stdout, "bti - version %s\n", BTI_VERSION);
  82 }
  83
  84 static char *get_string_from_stdin(void)
  85 {
  86         char *temp;
  87         char *string;
  88
  89         string = zalloc(1000);
  90         if (!string)
  91                 return NULL;
  92
  93         if (!fgets(string, 999, stdin))
  94                 return NULL;
  95         temp = strchr(string, '\n');
  96         *temp = '\0';
  97         return string;
  98 }
  99
 100 static struct session *session_alloc(void)
 101 {
 102         struct session *session;
 103
 104         session = zalloc(sizeof(*session));
 105         if (!session)
 106                 return NULL;
 107         return session;
 108 }
 109
 110 static void session_free(struct session *session)
 111 {
 112         if (!session)
 113                 return;
 114         free(session->password);
 115         free(session->account);
 116         free(session->tweet);
 117         free(session->proxy);
 118         free(session);
 119 }
 120
 121 static struct bti_curl_buffer *bti_curl_buffer_alloc(void)
 122 {
 123         struct bti_curl_buffer *buffer;
 124
 125         buffer = zalloc(sizeof(*buffer));
 126         if (!buffer)
 127                 return NULL;
 128
 129         /* start out with a data buffer of 1 byte to
 130          * make the buffer fill logic simpler */
 131         buffer->data = zalloc(1);
 132         if (!buffer->data) {
 133                 free(buffer);
 134                 return NULL;
 135         }
 136         buffer->length = 0;
 137         return buffer;
 138 }
 139
 140 static void bti_curl_buffer_free(struct bti_curl_buffer *buffer)
 141 {
 142         if (!buffer)
 143                 return;
 144         free(buffer->data);
 145         free(buffer);
 146 }
 147
 148 static const char *twitter_url = "https://twitter.com/statuses/update.xml";
 149 static const char *identica_url = "http://identi.ca/api/statuses/update.xml";
 150
 151 static CURL *curl_init(void)
 152 {
 153         CURL *curl;
 154
 155         curl = curl_easy_init();
 156         if (!curl) {
 157                 fprintf(stderr, "Can not init CURL!\n");
 158                 return NULL;
 159         }
 160         /* some ssl sanity checks on the connection we are making */
 161         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0);
 162         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0);
 163         return curl;
 164 }
 165
 166 size_t curl_callback(void *buffer, size_t size, size_t nmemb, void *userp)
 167 {
 168         struct bti_curl_buffer *curl_buf = userp;
 169         size_t buffer_size = size * nmemb;
 170         char *temp;
 171
 172         if ((!buffer) || (!buffer_size) || (!curl_buf))
 173                 return -EINVAL;
 174
 175         /* add to the data we already have */
 176         temp = zalloc(curl_buf->length + buffer_size + 1);
 177         if (!temp)
 178                 return -ENOMEM;
 179
 180         memcpy(temp, curl_buf->data, curl_buf->length);
 181         free(curl_buf->data);
 182         curl_buf->data = temp;
 183         memcpy(&curl_buf->data[curl_buf->length], (char *)buffer, buffer_size);
 184         curl_buf->length += buffer_size;
 185
 186         dbg("%s\n", curl_buf->data);
 187
 188         return buffer_size;
 189 }
 190
 191 static int send_tweet(struct session *session)
 192 {
 193         char user_password[500];
 194         char data[500];
 195         struct bti_curl_buffer *curl_buf;
 196         CURL *curl = NULL;
 197         CURLcode res;
 198         struct curl_httppost *formpost = NULL;
 199         struct curl_httppost *lastptr = NULL;
 200         struct curl_slist *slist = NULL;
 201
 202         if (!session)
 203                 return -EINVAL;
 204
 205         curl_buf = bti_curl_buffer_alloc();
 206         if (!curl_buf)
 207                 return -ENOMEM;
 208
 209         snprintf(user_password, sizeof(user_password), "%s:%s",
 210                  session->account, session->password);
 211         snprintf(data, sizeof(data), "status=\"%s\"", session->tweet);
 212
 213         curl = curl_init();
 214         if (!curl)
 215                 return -EINVAL;
 216
 217         curl_formadd(&formpost, &lastptr,
 218                      CURLFORM_COPYNAME, "status",
 219                      CURLFORM_COPYCONTENTS, session->tweet,
 220                      CURLFORM_END);
 221
 222         curl_easy_setopt(curl, CURLOPT_HTTPPOST, formpost);
 223
 224         switch (session->host) {
 225         case HOST_TWITTER:
 226                 curl_easy_setopt(curl, CURLOPT_URL, twitter_url);
 227                 /*
 228                  * twitter doesn't like the "Expect: 100-continue" header
 229                  * anymore, so turn it off.
 230                  */
 231                 slist = curl_slist_append(slist, "Expect:");
 232                 curl_easy_setopt(curl, CURLOPT_HTTPHEADER, slist);
 233                 break;
 234         case HOST_IDENTICA:
 235                 curl_easy_setopt(curl, CURLOPT_URL, identica_url);
 236                 break;
 237         }
 238
 239         if (session->proxy)
 240                 curl_easy_setopt(curl, CURLOPT_PROXY, session->proxy);
 241
 242         if (debug)
 243                 curl_easy_setopt(curl, CURLOPT_VERBOSE, 1);
 244         curl_easy_setopt(curl, CURLOPT_USERPWD, user_password);
 245
 246         dbg("user_password = %s\n", user_password);
 247         dbg("data = %s\n", data);
 248         dbg("proxy = %s\n", session->proxy);
 249
 250         curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, curl_callback);
 251         curl_easy_setopt(curl, CURLOPT_WRITEDATA, curl_buf);
 252         res = curl_easy_perform(curl);
 253         if (res && !session->bash) {
 254                 fprintf(stderr, "error(%d) trying to send tweet\n", res);
 255                 return -EINVAL;
 256         }
 257
 258         curl_easy_cleanup(curl);
 259         curl_formfree(formpost);
 260         bti_curl_buffer_free(curl_buf);
 261         return 0;
 262 }
 263
 264 static void parse_configfile(struct session *session)
 265 {
 266         FILE *config_file;
 267         char *line = NULL;
 268         size_t len = 0;
 269         char *account = NULL;
 270         char *password = NULL;
 271         char *host = NULL;
 272         char *proxy = NULL;
 273         char *file;
 274         char *home = getenv("HOME");
 275
 276         /* config file is ~/.bti  */
 277         file = alloca(strlen(home) + 7);
 278
 279         sprintf(file, "%s/.bti", home);
 280
 281         config_file = fopen(file, "r");
 282
 283         /* No error if file does not exist or is unreadable.  */
 284         if (config_file == NULL)
 285                 return;
 286
 287         do {
 288                 ssize_t n = getline(&line, &len, config_file);
 289                 if (n < 0)
 290                         break;
 291                 if (line[n - 1] == '\n')
 292                         line[n - 1] = '\0';
 293                 /* Parse file.  Format is the usual value pairs:
 294                    account=name
 295                    passwort=value
 296                    # is a comment character
 297                 */
 298                 *strchrnul(line, '#') = '\0';
 299                 char *c = line;
 300                 while (isspace(*c))
 301                         c++;
 302                 /* Ignore blank lines.  */
 303                 if (c[0] == '\0')
 304                         continue;
 305
 306                 if (!strncasecmp(c, "account", 7) && (c[7] == '=')) {
 307                         c += 8;
 308                         if (c[0] != '\0')
 309                                 account = strdup(c);
 310                 } else if (!strncasecmp(c, "password", 8) &&
 311                            (c[8] == '=')) {
 312                         c += 9;
 313                         if (c[0] != '\0')
 314                                 password = strdup(c);
 315                 } else if (!strncasecmp(c, "host", 4) &&
 316                            (c[4] == '=')) {
 317                         c += 5;
 318                         if (c[0] != '\0')
 319                                 host = strdup(c);
 320                 } else if (!strncasecmp(c, "proxy", 5) &&
 321                            (c[5] == '=')) {
 322                         c += 6;
 323                         if (c[0] != '\0')
 324                                 proxy = strdup(c);
 325                 }
 326         } while (!feof(config_file));
 327
 328         if (password)
 329                 session->password = password;
 330         if (account)
 331                 session->account = account;
 332         if (host) {
 333                 if (strcasecmp(host, "twitter") == 0)
 334                         session->host = HOST_TWITTER;
 335                 if (strcasecmp(host, "identica") == 0)
 336                         session->host = HOST_IDENTICA;
 337                 free(host);
 338         }
 339         if (proxy) {
 340                 if (session->proxy)
 341                         free(session->proxy);
 342                 session->proxy = proxy;
 343         }
 344
 345         /* Free buffer and close file.  */
 346         free(line);
 347         fclose(config_file);
 348 }
 349
 350 int main(int argc, char *argv[], char *envp[])
 351 {
 352         static const struct option options[] = {
 353                 { "debug", 0, NULL, 'd' },
 354                 { "account", 1, NULL, 'a' },
 355                 { "password", 1, NULL, 'p' },
 356                 { "host", 1, NULL, 'H' },
 357                 { "proxy", 1, NULL, 'P' },
 358                 { "help", 0, NULL, 'h' },
 359                 { "bash", 0, NULL, 'b' },
 360                 { "version", 0, NULL, 'v' },
 361                 { }
 362         };
 363         struct session *session;
 364         pid_t child;
 365         char *tweet;
 366         int retval;
 367         int option;
 368         char *http_proxy;
 369 #if 0
 370         char *home = getenv("HOME");
 371         char *pwd = getenv("PWD");
 372         char *dir;
 373 #endif
 374         session = session_alloc();
 375         if (!session) {
 376                 fprintf(stderr, "no more memory...\n");
 377                 return -1;
 378         }
 379
 380         curl_global_init(CURL_GLOBAL_ALL);
 381
 382         /* Set environment variables first, before reading command line options
 383          * or config file values. */
 384         http_proxy = getenv("http_proxy");
 385         if (http_proxy) {
 386                 if (session->proxy)
 387                         free(session->proxy);
 388                 session->proxy = strdup(http_proxy);
 389                 dbg("http_proxy = %s\n", session->proxy);
 390         }
 391
 392         parse_configfile(session);
 393
 394         while (1) {
 395                 option = getopt_long_only(argc, argv, "dqe:p:P:H:a:h",
 396                                           options, NULL);
 397                 if (option == -1)
 398                         break;
 399                 switch (option) {
 400                 case 'd':
 401                         debug = 1;
 402                         break;
 403                 case 'a':
 404                         if (session->account)
 405                                 free(session->account);
 406                         session->account = strdup(optarg);
 407                         dbg("account = %s\n", session->account);
 408                         break;
 409                 case 'p':
 410                         if (session->password)
 411                                 free(session->password);
 412                         session->password = strdup(optarg);
 413                         dbg("password = %s\n", session->password);
 414                         break;
 415                 case 'P':
 416                         if (session->proxy)
 417                                 free(session->proxy);
 418                         session->proxy = strdup(optarg);
 419                         dbg("proxy = %s\n", session->proxy);
 420                         break;
 421                 case 'H':
 422                         if (strcasecmp(optarg, "twitter") == 0)
 423                                 session->host = HOST_TWITTER;
 424                         if (strcasecmp(optarg, "identica") == 0)
 425                                 session->host = HOST_IDENTICA;
 426                         dbg("host = %d\n", session->host);
 427                         break;
 428                 case 'b':
 429                         session->bash= 1;
 430                         break;
 431                 case 'h':
 432                         display_help();
 433                         goto exit;
 434                 case 'v':
 435                         display_version();
 436                         goto exit;
 437                 default:
 438                         display_help();
 439                         goto exit;
 440                 }
 441         }
 442
 443         if (!session->account) {
 444                 fprintf(stdout, "Enter twitter account: ");
 445                 session->account = get_string_from_stdin();
 446         }
 447
 448         if (!session->password) {
 449                 fprintf(stdout, "Enter twitter password: ");
 450                 session->password = get_string_from_stdin();
 451         }
 452 #if 0
 453         /* get the current working directory basename */
 454         if (strcmp(pwd, home) == 0)
 455                 dir = "~";
 456         else {
 457                 dir = strrchr(pwd, '/');
 458                 if (dir)
 459                         dir++;
 460                 else
 461                         dir = "?";
 462         }
 463 #endif
 464         tweet = get_string_from_stdin();
 465         if (!tweet || strlen(tweet) == 0) {
 466                 dbg("no tweet?\n");
 467                 return -1;
 468         }
 469
 470 //      session->tweet = zalloc(strlen(tweet) + strlen(dir) + 10);
 471         session->tweet = zalloc(strlen(tweet) + 10);
 472
 473         /* if --bash is specified, add the "PWD $ " to
 474          * the start of the tweet. */
 475         if (session->bash)
 476 //              sprintf(session->tweet, "%s $ %s", dir, tweet);
 477                 sprintf(session->tweet, "$ %s", tweet);
 478         else
 479                 sprintf(session->tweet, "%s", tweet);
 480         free(tweet);
 481
 482         dbg("account = %s\n", session->account);
 483         dbg("password = %s\n", session->password);
 484         dbg("tweet = %s\n", session->tweet);
 485         dbg("host = %d\n", session->host);
 486
 487         /* fork ourself so that the main shell can get on
 488          * with it's life as we try to connect and handle everything
 489          */
 490         if (session->bash) {
 491                 child = fork();
 492                         if (child) {
 493                         dbg("child is %d\n", child);
 494                         exit(0);
 495                 }
 496         }
 497
 498         retval = send_tweet(session);
 499         if (retval && !session->bash) {
 500                 fprintf(stderr, "tweet failed\n");
 501                 return -1;
 502         }
 503
 504         session_free(session);
 505 exit:
 506         return 0;
 507 }