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