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