bti.c

   1 /*
   2  * Copyright (C) 2008-2011 Greg Kroah-Hartman <greg@kroah.com>
   3  * Copyright (C) 2009 Bart Trojanowski <bart@jukie.net>
   4  * Copyright (C) 2009-2010 Amir Mohammad Saied <amirsaied@gmail.com>
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License as published by the
   8  * Free Software Foundation version 2 of the License.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License for more details.
  14  */
  15
  16 #define _GNU_SOURCE
  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 <sys/types.h>
  30 #include <sys/wait.h>
  31 #include <curl/curl.h>
  32 #include <libxml/xmlmemory.h>
  33 #include <libxml/parser.h>
  34 #include <libxml/tree.h>
  35 #include <json-c/json.h>
  36 #include <pcre.h>
  37 #include <termios.h>
  38 #include <dlfcn.h>
  39 #include <oauth.h>
  40 #include "bti.h"
  41
  42 #define zalloc(size)    calloc(size, 1)
  43
  44 #define dbg(format, arg...)                                             \
  45         do {                                                            \
  46                 if (debug)                                              \
  47                         fprintf(stdout, "bti: %s: " format , __func__ , \
  48                                 ## arg);                                \
  49         } while (0)
  50
  51
  52 int debug;
  53
  54 static void display_help(void)
  55 {
  56         fprintf(stdout, "bti - send tweet to twitter or identi.ca\n"
  57                 "Version: %s\n"
  58                 "Usage:\n"
  59                 "  bti [options]\n"
  60                 "options are:\n"
  61                 "  --account accountname\n"
  62                 "  --password password\n"
  63                 "  --action action\n"
  64                 "    ('update', 'friends', 'public', 'replies', 'user', or 'direct')\n"
  65                 "  --user screenname\n"
  66                 "  --group groupname\n"
  67                 "  --proxy PROXY:PORT\n"
  68                 "  --host HOST\n"
  69                 "  --logfile logfile\n"
  70                 "  --config configfile\n"
  71                 "  --replyto ID\n"
  72                 "  --retweet ID\n"
  73                 "  --shrink-urls\n"
  74                 "  --page PAGENUMBER\n"
  75                 "  --column COLUMNWIDTH\n"
  76                 "  --bash\n"
  77                 "  --background\n"
  78                 "  --debug\n"
  79                 "  --verbose\n"
  80                 "  --dry-run\n"
  81                 "  --version\n"
  82                 "  --help\n", VERSION);
  83 }
  84
  85 static int strlen_utf8(char *s)
  86 {
  87         int i = 0, j = 0;
  88         while (s[i]) {
  89                 if ((s[i] & 0xc0) != 0x80)
  90                         j++;
  91                 i++;
  92         }
  93         return j;
  94 }
  95
  96 static void display_version(void)
  97 {
  98         fprintf(stdout, "bti - version %s\n", VERSION);
  99 }
 100
 101 static char *get_string(const char *name)
 102 {
 103         char *temp;
 104         char *string;
 105
 106         string = zalloc(1000);
 107         if (!string)
 108                 exit(1);
 109         if (name != NULL)
 110                 fprintf(stdout, "%s", name);
 111         if (!fgets(string, 999, stdin)) {
 112                 free(string);
 113                 return NULL;
 114         }
 115         temp = strchr(string, '\n');
 116         if (temp)
 117                 *temp = '\0';
 118         return string;
 119 }
 120
 121 /*
 122  * Try to get a handle to a readline function from a variety of different
 123  * libraries.  If nothing is present on the system, then fall back to an
 124  * internal one.
 125  *
 126  * Logic originally based off of code in the e2fsutils package in the
 127  * lib/ss/get_readline.c file, which is licensed under the MIT license.
 128  *
 129  * This keeps us from having to relicense the bti codebase if readline
 130  * ever changes its license, as there is no link-time dependency.
 131  * It is a run-time thing only, and we handle any readline-like library
 132  * in the same manner, making bti not be a derivative work of any
 133  * other program.
 134  */
 135 static void session_readline_init(struct session *session)
 136 {
 137         /* Libraries we will try to use for readline/editline functionality */
 138         const char *libpath = "libreadline.so.6:libreadline.so.5:"
 139                                 "libreadline.so.4:libreadline.so:libedit.so.2:"
 140                                 "libedit.so:libeditline.so.0:libeditline.so";
 141         void *handle = NULL;
 142         char *tmp, *cp, *next;
 143         int (*bind_key)(int, void *);
 144         void (*insert)(void);
 145
 146         /* default to internal function if we can't or won't find anything */
 147         session->readline = get_string;
 148         if (!isatty(0))
 149                 return;
 150         session->interactive = 1;
 151
 152         tmp = malloc(strlen(libpath)+1);
 153         if (!tmp)
 154                 return;
 155         strcpy(tmp, libpath);
 156         for (cp = tmp; cp; cp = next) {
 157                 next = strchr(cp, ':');
 158                 if (next)
 159                         *next++ = 0;
 160                 if (*cp == 0)
 161                         continue;
 162                 handle = dlopen(cp, RTLD_NOW);
 163                 if (handle) {
 164                         dbg("Using %s for readline library\n", cp);
 165                         break;
 166                 }
 167         }
 168         free(tmp);
 169         if (!handle) {
 170                 dbg("No readline library found.\n");
 171                 return;
 172         }
 173
 174         session->readline_handle = handle;
 175         session->readline = (char *(*)(const char *))dlsym(handle, "readline");
 176         if (session->readline == NULL) {
 177                 /* something odd happened, default back to internal stuff */
 178                 session->readline_handle = NULL;
 179                 session->readline = get_string;
 180                 return;
 181         }
 182
 183         /*
 184          * If we found a library, turn off filename expansion
 185          * as that makes no sense from within bti.
 186          */
 187         bind_key = (int (*)(int, void *))dlsym(handle, "rl_bind_key");
 188         insert = (void (*)(void))dlsym(handle, "rl_insert");
 189         if (bind_key && insert)
 190                 bind_key('\t', insert);
 191 }
 192
 193 static void session_readline_cleanup(struct session *session)
 194 {
 195         if (session->readline_handle)
 196                 dlclose(session->readline_handle);
 197 }
 198
 199 static struct session *session_alloc(void)
 200 {
 201         struct session *session;
 202
 203         session = zalloc(sizeof(*session));
 204         if (!session)
 205                 return NULL;
 206         return session;
 207 }
 208
 209 static void session_free(struct session *session)
 210 {
 211         if (!session)
 212                 return;
 213         free(session->retweet);
 214         free(session->replyto);
 215         free(session->password);
 216         free(session->account);
 217         free(session->consumer_key);
 218         free(session->consumer_secret);
 219         free(session->access_token_key);
 220         free(session->access_token_secret);
 221         free(session->tweet);
 222         free(session->proxy);
 223         free(session->time);
 224         free(session->homedir);
 225         free(session->user);
 226         free(session->group);
 227         free(session->hosturl);
 228         free(session->hostname);
 229         free(session->configfile);
 230         free(session);
 231 }
 232
 233 static struct bti_curl_buffer *bti_curl_buffer_alloc(enum action action)
 234 {
 235         struct bti_curl_buffer *buffer;
 236
 237         buffer = zalloc(sizeof(*buffer));
 238         if (!buffer)
 239                 return NULL;
 240
 241         /* start out with a data buffer of 1 byte to
 242          * make the buffer fill logic simpler */
 243         buffer->data = zalloc(1);
 244         if (!buffer->data) {
 245                 free(buffer);
 246                 return NULL;
 247         }
 248         buffer->length = 0;
 249         buffer->action = action;
 250         return buffer;
 251 }
 252
 253 static void bti_curl_buffer_free(struct bti_curl_buffer *buffer)
 254 {
 255         if (!buffer)
 256                 return;
 257         free(buffer->data);
 258         free(buffer);
 259 }
 260
 261 const char twitter_host[]  = "https://api.twitter.com/1.1/statuses";
 262 const char twitter_host_stream[]  = "https://stream.twitter.com/1.1/statuses"; /*this is not reset, and doesnt work */
 263 const char twitter_host_simple[]  = "https://api.twitter.com/1.1";
 264 const char twitter_name[]  = "twitter";
 265
 266 static const char twitter_request_token_uri[]  = "https://twitter.com/oauth/request_token";
 267 static const char twitter_access_token_uri[]   = "https://twitter.com/oauth/access_token";
 268 static const char twitter_authorize_uri[]      = "https://twitter.com/oauth/authorize?oauth_token=";
 269 static const char custom_request_token_uri[]   = "/../oauth/request_token?oauth_callback=oob";
 270 static const char custom_access_token_uri[]    = "/../oauth/access_token";
 271 static const char custom_authorize_uri[]       = "/../oauth/authorize?oauth_token=";
 272
 273 static const char user_uri[]     = "/user_timeline.json";
 274 static const char update_uri[]   = "/update.json";
 275 static const char public_uri[]   = "/sample.json";
 276 static const char friends_uri[]  = "/home_timeline.json";
 277 static const char mentions_uri[] = "/mentions_timeline.json";
 278 static const char replies_uri[]  = "/replies.xml";
 279 static const char retweet_uri[]  = "/retweet/";
 280 static const char group_uri[]    = "/../statusnet/groups/timeline/";
 281 /*static const char direct_uri[]   = "/direct_messages/new.xml";*/
 282 static const char direct_uri[]   = "/direct_messages/new.json";
 283
 284 static const char config_default[]      = "/etc/bti";
 285 static const char config_xdg_default[] = ".config/bti";
 286 static const char config_user_default[] = ".bti";
 287
 288
 289 static CURL *curl_init(void)
 290 {
 291         CURL *curl;
 292
 293         curl = curl_easy_init();
 294         if (!curl) {
 295                 fprintf(stderr, "Can not init CURL!\n");
 296                 return NULL;
 297         }
 298         /* some ssl sanity checks on the connection we are making */
 299         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0);
 300         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0);
 301         return curl;
 302 }
 303
 304 static void find_config_file(struct session *session)
 305 {
 306         struct stat s;
 307         char *home;
 308         char *file;
 309         int homedir_size;
 310
 311         /*
 312          * Get the home directory so we can try to find a config file.
 313          * If we have no home dir set up, look in /etc/bti
 314          */
 315         home = getenv("HOME");
 316         if (!home) {
 317                 /* No home dir, so take the defaults and get out of here */
 318                 session->homedir = strdup("");
 319                 session->configfile = strdup(config_default);
 320                 return;
 321         }
 322
 323         /* We have a home dir, so this might be a user */
 324         session->homedir = strdup(home);
 325         homedir_size = strlen(session->homedir);
 326
 327         /*
 328          * Try to find a config file, we do so in this order:
 329          * ~/.bti               old-school config file
 330          * ~/.config/bti        new-school config file
 331          */
 332         file = zalloc(homedir_size + strlen(config_user_default) + 7);
 333         sprintf(file, "%s/%s", home, config_user_default);
 334         if (stat(file, &s) == 0) {
 335                 /* Found the config file at ~/.bti */
 336                 session->configfile = strdup(file);
 337                 free(file);
 338                 return;
 339         }
 340
 341         free(file);
 342         file = zalloc(homedir_size + strlen(config_xdg_default) + 7);
 343         sprintf(file, "%s/%s", home, config_xdg_default);
 344         if (stat(file, &s) == 0) {
 345                 /* config file is at ~/.config/bti */
 346                 session->configfile = strdup(file);
 347                 free(file);
 348                 return;
 349         }
 350
 351         /* No idea where the config file is, so punt */
 352         free(file);
 353         session->configfile = strdup("");
 354 }
 355
 356 /* The final place data is sent to the screen/pty/tty */
 357 static void bti_output_line(struct session *session, xmlChar *user,
 358                             xmlChar *id, xmlChar *created, xmlChar *text)
 359 {
 360         if (session->verbose)
 361                 printf("[%*s] {%s} (%.16s) %s\n", -session->column_output, user,
 362                                 id, created, text);
 363         else
 364                 printf("[%*s] %s\n", -session->column_output, user, text);
 365 }
 366
 367 static void parse_statuses(struct session *session,
 368                            xmlDocPtr doc, xmlNodePtr current)
 369 {
 370         xmlChar *text = NULL;
 371         xmlChar *user = NULL;
 372         xmlChar *created = NULL;
 373         xmlChar *id = NULL;
 374         xmlNodePtr userinfo;
 375
 376         current = current->xmlChildrenNode;
 377         while (current != NULL) {
 378                 if (current->type == XML_ELEMENT_NODE) {
 379                         if (!xmlStrcmp(current->name, (const xmlChar *)"created_at"))
 380                                 created = xmlNodeListGetString(doc, current->xmlChildrenNode, 1);
 381                         if (!xmlStrcmp(current->name, (const xmlChar *)"text"))
 382                                 text = xmlNodeListGetString(doc, current->xmlChildrenNode, 1);
 383                         if (!xmlStrcmp(current->name, (const xmlChar *)"id"))
 384                                 id = xmlNodeListGetString(doc, current->xmlChildrenNode, 1);
 385                         if (!xmlStrcmp(current->name, (const xmlChar *)"user")) {
 386                                 userinfo = current->xmlChildrenNode;
 387                                 while (userinfo != NULL) {
 388                                         if ((!xmlStrcmp(userinfo->name, (const xmlChar *)"screen_name"))) {
 389                                                 if (user)
 390                                                         xmlFree(user);
 391                                                 user = xmlNodeListGetString(doc, userinfo->xmlChildrenNode, 1);
 392                                         }
 393                                         userinfo = userinfo->next;
 394                                 }
 395                         }
 396
 397                         if (user && text && created && id) {
 398                                 bti_output_line(session, user, id,
 399                                                 created, text);
 400                                 xmlFree(user);
 401                                 xmlFree(text);
 402                                 xmlFree(created);
 403                                 xmlFree(id);
 404                                 user = NULL;
 405                                 text = NULL;
 406                                 created = NULL;
 407                                 id = NULL;
 408                         }
 409                 }
 410                 current = current->next;
 411         }
 412
 413         return;
 414 }
 415
 416 static void parse_timeline(char *document, struct session *session)
 417 {
 418         xmlDocPtr doc;
 419         xmlNodePtr current;
 420
 421         doc = xmlReadMemory(document, strlen(document), "timeline.xml",
 422                             NULL, XML_PARSE_NOERROR);
 423         if (doc == NULL)
 424                 return;
 425
 426         current = xmlDocGetRootElement(doc);
 427         if (current == NULL) {
 428                 fprintf(stderr, "empty document\n");
 429                 xmlFreeDoc(doc);
 430                 return;
 431         }
 432
 433         if (xmlStrcmp(current->name, (const xmlChar *) "statuses")) {
 434                 fprintf(stderr, "unexpected document type\n");
 435                 xmlFreeDoc(doc);
 436                 return;
 437         }
 438
 439         current = current->xmlChildrenNode;
 440         while (current != NULL) {
 441                 if ((!xmlStrcmp(current->name, (const xmlChar *)"status")))
 442                         parse_statuses(session, doc, current);
 443                 current = current->next;
 444         }
 445         xmlFreeDoc(doc);
 446
 447         return;
 448 }
 449
 450
 451 /* avoids the c99 option */
 452 #define json_object_object_foreach_alt(obj,key,val)             \
 453         char *key;                                              \
 454         struct json_object *val;                                \
 455         struct lh_entry *entry;                                 \
 456         for (entry = json_object_get_object(obj)->head;         \
 457                 ({ if(entry && !is_error(entry)) {              \
 458                         key = (char*)entry->k;                  \
 459                         val = (struct json_object*)entry->v;    \
 460                 } ; entry; });                                  \
 461                 entry = entry->next )
 462
 463
 464 /* Forward Declaration */
 465 static void json_parse(json_object * jobj, int nestlevel);
 466
 467 static void print_json_value(json_object *jobj, int nestlevel)
 468 {
 469         enum json_type type;
 470
 471         type = json_object_get_type(jobj);
 472         switch (type) {
 473         case json_type_boolean:
 474                 printf("boolean   ");
 475                 printf("value: %s\n", json_object_get_boolean(jobj)? "true": "false");
 476                 break;
 477         case json_type_double:
 478                 printf("double    ");
 479                 printf("value: %lf\n", json_object_get_double(jobj));
 480                 break;
 481         case json_type_int:
 482                 printf("int       ");
 483                 printf("value: %d\n", json_object_get_int(jobj));
 484                 break;
 485         case json_type_string:
 486                 printf("string    ");
 487                 printf("value: %s\n", json_object_get_string(jobj));
 488                 break;
 489         default:
 490                 break;
 491         }
 492 }
 493
 494 #define MAXKEYSTACK 20
 495 char *keystack[MAXKEYSTACK];
 496
 497 static void json_parse_array(json_object *jobj, char *key, int nestlevel)
 498 {
 499         enum json_type type;
 500
 501         nestlevel++;
 502         /* Simply get the array */
 503         json_object *jarray = jobj;
 504         if (key) {
 505                 /* Get the array if it is a key value pair */
 506                 jarray = json_object_object_get(jobj, key);
 507         }
 508
 509         /* Get the length of the array */
 510         int arraylen = json_object_array_length(jarray);
 511         if (debug)
 512                 printf("Array Length: %d\n",arraylen);
 513         int i;
 514         json_object *jvalue;
 515
 516         for (i = 0; i < arraylen; i++) {
 517                 if (debug) {
 518                         int j;
 519                         for (j=0; j < nestlevel; ++j)
 520                                 printf("  ");
 521                         printf("element[%d]\n",i);
 522                 }
 523
 524                 /* Get the array element at position i */
 525                 jvalue = json_object_array_get_idx(jarray, i);
 526                 type = json_object_get_type(jvalue);
 527                 if (type == json_type_array) {
 528                         json_parse_array(jvalue, NULL, nestlevel);
 529                 } else if (type != json_type_object) {
 530                         if (debug) {
 531                                 printf("value[%d]: ", i);
 532                                 print_json_value(jvalue,nestlevel);
 533                         }
 534                 } else {
 535                         /* printf("obj: "); */
 536                         keystack[nestlevel%MAXKEYSTACK]="[]";
 537                         json_parse(jvalue,nestlevel);
 538                 }
 539         }
 540 }
 541
 542
 543 struct results {
 544         int code;
 545         char *message;
 546 } results;
 547
 548 struct session *store_session;
 549 struct tweetdetail {
 550         char *id;
 551         char *text;
 552         char *screen_name;
 553         char *created_at;
 554 } tweetdetail;
 555
 556 static void json_interpret(json_object *jobj, int nestlevel)
 557 {
 558         if (nestlevel == 3 &&
 559             strcmp(keystack[1], "errors") == 0 &&
 560             strcmp(keystack[2], "[]") == 0) {
 561                 if (strcmp(keystack[3], "message") == 0) {
 562                         if (json_object_get_type(jobj) == json_type_string)
 563                                 results.message = (char *)json_object_get_string(jobj);
 564                 }
 565                 if (strcmp(keystack[3], "code") == 0) {
 566                         if (json_object_get_type(jobj) == json_type_int)
 567                                 results.code = json_object_get_int(jobj);
 568                 }
 569         }
 570
 571         if (nestlevel >= 2 &&
 572             strcmp(keystack[1],"[]") == 0) {
 573                 if (strcmp(keystack[2], "created_at") == 0) {
 574                         if (debug)
 575                                 printf("%s : %s\n", keystack[2], json_object_get_string(jobj));
 576                         tweetdetail.created_at = (char *)json_object_get_string(jobj);
 577                 }
 578                 if (strcmp(keystack[2], "text") == 0) {
 579                         if (debug)
 580                                 printf("%s : %s\n", keystack[2], json_object_get_string(jobj));
 581                         tweetdetail.text = (char *)json_object_get_string(jobj);
 582                 }
 583                 if (strcmp(keystack[2], "id") == 0) {
 584                         if (debug)
 585                                 printf("%s : %s\n", keystack[2], json_object_get_string(jobj));
 586                         tweetdetail.id = (char *)json_object_get_string(jobj);
 587                 }
 588                 if (nestlevel >= 3 &&
 589                     strcmp(keystack[2], "user") == 0) {
 590                         if (strcmp(keystack[3], "screen_name") == 0) {
 591                                 if (debug)
 592                                         printf("%s->%s : %s\n", keystack[2], keystack[3], json_object_get_string(jobj));
 593                                 tweetdetail.screen_name=(char *)json_object_get_string(jobj);
 594                                 bti_output_line(store_session,
 595                                                 (xmlChar *)tweetdetail.screen_name,
 596                                                 (xmlChar *)tweetdetail.id,
 597                                                 (xmlChar *)tweetdetail.created_at,
 598                                                 (xmlChar *)tweetdetail.text);
 599                                 }
 600                 }
 601         }
 602 }
 603
 604 /* Parsing the json object */
 605 static void json_parse(json_object * jobj, int nestlevel)
 606 {
 607         int i;
 608
 609         if (jobj==NULL) {
 610                 fprintf(stderr,"jobj null\n");
 611                 return;
 612         }
 613         nestlevel++;
 614         enum json_type type;
 615         json_object_object_foreach_alt(jobj, key, val) {
 616                 /* work around pre10 */
 617                 if (val)
 618                         type = json_object_get_type(val);
 619                 else
 620                         type=json_type_null;
 621                 if (debug)
 622                         for (i = 0; i < nestlevel; ++i)
 623                                 printf("  ");
 624                 if (debug)
 625                         printf("key %-34s ", key);
 626                 if (debug)
 627                         for (i = 0; i < 8 - nestlevel; ++i)
 628                                 printf("  ");
 629                 switch (type) {
 630                 case json_type_boolean:
 631                 case json_type_double:
 632                 case json_type_int:
 633                 case json_type_string:
 634                         if (debug) print_json_value(val,nestlevel);
 635                         if (debug) for (i=0; i<nestlevel+1; ++i) printf("  ");
 636                         if (debug) printf("(");
 637                         if (debug) for (i=1; i<nestlevel; ++i) { printf("%s->",keystack[i]); }
 638                         if (debug) printf("%s)\n",key);
 639                         keystack[nestlevel%MAXKEYSTACK] = key;
 640                         json_interpret(val,nestlevel);
 641                         break;
 642                 case json_type_object:
 643                         if (debug) printf("json_type_object\n");
 644                         keystack[nestlevel%MAXKEYSTACK] = key;
 645                         json_parse(json_object_object_get(jobj, key), nestlevel);
 646                         break;
 647                 case json_type_array:
 648                         if (debug) printf("json_type_array, ");
 649                         keystack[nestlevel%MAXKEYSTACK] = key;
 650                         json_parse_array(jobj, key, nestlevel);
 651                         break;
 652                 case json_type_null:
 653                         if (debug) printf("null\n");
 654                         break;
 655                 default:
 656                         if (debug) printf("\n");
 657                         break;
 658                 }
 659         }
 660 }
 661
 662 static int parse_response_json(char *document, struct session *session)
 663 {
 664         dbg("Got this json response:\n");
 665         dbg("%s\n",document);
 666
 667         results.code=0;
 668         results.message=NULL;
 669         json_object *jobj = json_tokener_parse(document);
 670
 671         /* make global for now */
 672         store_session = session;
 673         if (!is_error(jobj)) {
 674                 /* guards against a json pre 0.10 bug */
 675                 json_parse(jobj,0);
 676         }
 677         if (results.code && results.message != NULL) {
 678                 if (debug)
 679                         printf("Got an error code:\n  code=%d\n  message=%s\n",
 680                                 results.code, results.message);
 681                 fprintf(stderr, "error condition detected: %d = %s\n",
 682                         results.code, results.message);
 683                 return -EIO;
 684         }
 685         return 0;
 686 }
 687
 688 static void parse_timeline_json(char *document, struct session *session)
 689 {
 690         dbg("Got this json response:\n");
 691         dbg("%s\n",document);
 692         results.code = 0;
 693         results.message = NULL;
 694         json_object *jobj = json_tokener_parse(document);
 695
 696         /* make global for now */
 697         store_session = session;
 698         if (!is_error(jobj)) {
 699                 /* guards against a json pre 0.10 bug */
 700                 if (json_object_get_type(jobj)==json_type_array) {
 701                         json_parse_array(jobj, NULL, 0);
 702                 } else {
 703                         json_parse(jobj,0);
 704                 }
 705         }
 706         if (results.code && results.message != NULL) {
 707                 if (debug)
 708                         printf("Got an error code:\n  code=%d\n  message=%s\n",
 709                                 results.code, results.message);
 710                 fprintf(stderr, "error condition detected: %d = %s\n",
 711                         results.code, results.message);
 712         }
 713 }
 714
 715 static size_t curl_callback(void *buffer, size_t size, size_t nmemb,
 716                             void *userp)
 717 {
 718         struct bti_curl_buffer *curl_buf = userp;
 719         size_t buffer_size = size * nmemb;
 720         char *temp;
 721
 722         if ((!buffer) || (!buffer_size) || (!curl_buf))
 723                 return -EINVAL;
 724
 725         /* add to the data we already have */
 726         temp = zalloc(curl_buf->length + buffer_size + 1);
 727         if (!temp)
 728                 return -ENOMEM;
 729
 730         memcpy(temp, curl_buf->data, curl_buf->length);
 731         free(curl_buf->data);
 732         curl_buf->data = temp;
 733         memcpy(&curl_buf->data[curl_buf->length], (char *)buffer, buffer_size);
 734         curl_buf->length += buffer_size;
 735         if (curl_buf->action)
 736                 parse_timeline(curl_buf->data, curl_buf->session);
 737
 738         dbg("%s\n", curl_buf->data);
 739
 740         return buffer_size;
 741 }
 742
 743 static int parse_osp_reply(const char *reply, char **token, char **secret)
 744 {
 745         int rc;
 746         int retval = 1;
 747         char **rv = NULL;
 748         rc = oauth_split_url_parameters(reply, &rv);
 749         qsort(rv, rc, sizeof(char *), oauth_cmpstringp);
 750         if (rc == 2 || rc == 4) {
 751                 if (!strncmp(rv[0], "oauth_token=", 11) &&
 752                     !strncmp(rv[1], "oauth_token_secret=", 18)) {
 753                         if (token)
 754                                 *token = strdup(&(rv[0][12]));
 755                         if (secret)
 756                                 *secret = strdup(&(rv[1][19]));
 757
 758                         retval = 0;
 759                 }
 760         } else if (rc == 3) {
 761                 if (!strncmp(rv[1], "oauth_token=", 11) &&
 762                     !strncmp(rv[2], "oauth_token_secret=", 18)) {
 763                         if (token)
 764                                 *token = strdup(&(rv[1][12]));
 765                         if (secret)
 766                                 *secret = strdup(&(rv[2][19]));
 767
 768                         retval = 0;
 769                 }
 770         }
 771
 772         dbg("token: %s\n", *token);
 773         dbg("secret: %s\n", *secret);
 774
 775         if (rv)
 776                 free(rv);
 777
 778         return retval;
 779 }
 780
 781 static int request_access_token(struct session *session)
 782 {
 783         char *post_params = NULL;
 784         char *request_url = NULL;
 785         char *reply       = NULL;
 786         char *at_key      = NULL;
 787         char *at_secret   = NULL;
 788         char *verifier    = NULL;
 789         char at_uri[90];
 790         char token_uri[90];
 791
 792         if (!session)
 793                 return -EINVAL;
 794
 795         if (session->host == HOST_TWITTER)
 796                 request_url = oauth_sign_url2(
 797                                 twitter_request_token_uri, NULL,
 798                                 OA_HMAC, NULL, session->consumer_key,
 799                                 session->consumer_secret, NULL, NULL);
 800         else {
 801                 sprintf(token_uri, "%s%s",
 802                         session->hosturl, custom_request_token_uri);
 803                 request_url = oauth_sign_url2(
 804                                 token_uri, NULL,
 805                                 OA_HMAC, NULL, session->consumer_key,
 806                                 session->consumer_secret, NULL, NULL);
 807         }
 808         reply = oauth_http_get(request_url, post_params);
 809
 810         if (request_url)
 811                 free(request_url);
 812
 813         if (post_params)
 814                 free(post_params);
 815
 816         if (!reply)
 817                 return 1;
 818
 819         if (parse_osp_reply(reply, &at_key, &at_secret))
 820                 return 1;
 821
 822         free(reply);
 823
 824         fprintf(stdout,
 825                 "Please open the following link in your browser, and "
 826                 "allow 'bti' to access your account. Then paste "
 827                 "back the provided PIN in here.\n");
 828         if (session->host == HOST_TWITTER) {
 829                 fprintf(stdout, "%s%s\nPIN: ", twitter_authorize_uri, at_key);
 830                 verifier = session->readline(NULL);
 831                 sprintf(at_uri, "%s?oauth_verifier=%s",
 832                         twitter_access_token_uri, verifier);
 833         } else {
 834                 fprintf(stdout, "%s%s%s\nPIN: ",
 835                         session->hosturl, custom_authorize_uri, at_key);
 836                 verifier = session->readline(NULL);
 837                 sprintf(at_uri, "%s%s?oauth_verifier=%s",
 838                         session->hosturl, custom_access_token_uri, verifier);
 839         }
 840         request_url = oauth_sign_url2(at_uri, NULL, OA_HMAC, NULL,
 841                                       session->consumer_key,
 842                                       session->consumer_secret,
 843                                       at_key, at_secret);
 844         reply = oauth_http_get(request_url, post_params);
 845
 846         if (!reply)
 847                 return 1;
 848
 849         if (parse_osp_reply(reply, &at_key, &at_secret))
 850                 return 1;
 851
 852         free(reply);
 853
 854         fprintf(stdout,
 855                 "Please put these two lines in your bti "
 856                 "configuration file (%s):\n"
 857                 "access_token_key=%s\n"
 858                 "access_token_secret=%s\n",
 859                 session->configfile, at_key, at_secret);
 860
 861         return 0;
 862 }
 863
 864 static int send_request(struct session *session)
 865 {
 866         const int endpoint_size = 2000;
 867         char endpoint[endpoint_size];
 868         char user_password[500];
 869         char data[500];
 870         struct bti_curl_buffer *curl_buf;
 871         CURL *curl = NULL;
 872         CURLcode res;
 873         struct curl_httppost *formpost = NULL;
 874         struct curl_httppost *lastptr = NULL;
 875         struct curl_slist *slist = NULL;
 876         char *req_url = NULL;
 877         char *reply = NULL;
 878         char *postarg = NULL;
 879         char *escaped_tweet = NULL;
 880         int is_post = 0;
 881
 882         if (!session)
 883                 return -EINVAL;
 884
 885         if (!session->hosturl)
 886                 session->hosturl = strdup(twitter_host);
 887
 888         if (session->no_oauth || session->guest) {
 889                 curl_buf = bti_curl_buffer_alloc(session->action);
 890                 if (!curl_buf)
 891                         return -ENOMEM;
 892                 curl_buf->session = session;
 893
 894                 curl = curl_init();
 895                 if (!curl) {
 896                         bti_curl_buffer_free(curl_buf);
 897                         return -EINVAL;
 898                 }
 899
 900                 if (!session->hosturl)
 901                         session->hosturl = strdup(twitter_host);
 902
 903                 switch (session->action) {
 904                 case ACTION_UPDATE:
 905                         snprintf(user_password, sizeof(user_password), "%s:%s",
 906                                  session->account, session->password);
 907                         snprintf(data, sizeof(data), "status=\"%s\"",
 908                                  session->tweet);
 909                         curl_formadd(&formpost, &lastptr,
 910                                      CURLFORM_COPYNAME, "status",
 911                                      CURLFORM_COPYCONTENTS, session->tweet,
 912                                      CURLFORM_END);
 913
 914                         curl_formadd(&formpost, &lastptr,
 915                                      CURLFORM_COPYNAME, "source",
 916                                      CURLFORM_COPYCONTENTS, "bti",
 917                                      CURLFORM_END);
 918
 919                         if (session->replyto)
 920                                 curl_formadd(&formpost, &lastptr,
 921                                              CURLFORM_COPYNAME,
 922                                              "in_reply_to_status_id",
 923                                              CURLFORM_COPYCONTENTS,
 924                                              session->replyto,
 925                                              CURLFORM_END);
 926
 927                         curl_easy_setopt(curl, CURLOPT_HTTPPOST, formpost);
 928                         slist = curl_slist_append(slist, "Expect:");
 929                         curl_easy_setopt(curl, CURLOPT_HTTPHEADER, slist);
 930
 931                         snprintf(endpoint, endpoint_size, "%s%s", session->hosturl, update_uri);
 932                         curl_easy_setopt(curl, CURLOPT_URL, endpoint);
 933                         curl_easy_setopt(curl, CURLOPT_USERPWD, user_password);
 934                         break;
 935
 936                 case ACTION_FRIENDS:
 937                         snprintf(user_password, sizeof(user_password), "%s:%s",
 938                                  session->account, session->password);
 939                         snprintf(endpoint, endpoint_size, "%s%s?page=%d", session->hosturl,
 940                                         friends_uri, session->page);
 941                         curl_easy_setopt(curl, CURLOPT_URL, endpoint);
 942                         curl_easy_setopt(curl, CURLOPT_USERPWD, user_password);
 943                         break;
 944
 945                 case ACTION_USER:
 946                         snprintf(endpoint, endpoint_size, "%s%s%s.xml?page=%d", session->hosturl,
 947                                 user_uri, session->user, session->page);
 948                         curl_easy_setopt(curl, CURLOPT_URL, endpoint);
 949                         break;
 950
 951                 case ACTION_REPLIES:
 952                         snprintf(user_password, sizeof(user_password), "%s:%s",
 953                                  session->account, session->password);
 954                         snprintf(endpoint, endpoint_size, "%s%s?page=%d", session->hosturl,
 955                                 replies_uri, session->page);
 956                         curl_easy_setopt(curl, CURLOPT_URL, endpoint);
 957                         curl_easy_setopt(curl, CURLOPT_USERPWD, user_password);
 958                         break;
 959
 960                 case ACTION_PUBLIC:
 961                         /*snprintf(endpoint, endpoint_size, "%s%s?page=%d", session->hosturl,*/
 962                         snprintf(endpoint, endpoint_size, "%s%s", twitter_host_stream,
 963                                 public_uri);
 964                         curl_easy_setopt(curl, CURLOPT_URL, endpoint);
 965                         break;
 966
 967                 case ACTION_GROUP:
 968                         snprintf(endpoint, endpoint_size, "%s%s%s.xml?page=%d",
 969                                 session->hosturl, group_uri, session->group,
 970                                 session->page);
 971                         curl_easy_setopt(curl, CURLOPT_URL, endpoint);
 972                         break;
 973
 974                 case ACTION_DIRECT:
 975                     /* NOT IMPLEMENTED - twitter requires authentication anyway */
 976                         break;
 977
 978                 default:
 979                         break;
 980                 }
 981
 982                 if (session->proxy)
 983                         curl_easy_setopt(curl, CURLOPT_PROXY, session->proxy);
 984
 985                 if (debug)
 986                         curl_easy_setopt(curl, CURLOPT_VERBOSE, 1);
 987
 988                 dbg("user_password = %s\n", user_password);
 989                 dbg("data = %s\n", data);
 990                 dbg("proxy = %s\n", session->proxy);
 991
 992                 curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, curl_callback);
 993                 curl_easy_setopt(curl, CURLOPT_WRITEDATA, curl_buf);
 994                 if (!session->dry_run) {
 995                         res = curl_easy_perform(curl);
 996                         if (!session->background) {
 997                                 xmlDocPtr doc;
 998                                 xmlNodePtr current;
 999
1000                                 if (res) {
1001                                         fprintf(stderr,
1002                                                 "error(%d) trying to perform operation\n",
1003                                                 res);
1004                                         curl_easy_cleanup(curl);
1005                                         if (session->action == ACTION_UPDATE)
1006                                                 curl_formfree(formpost);
1007                                         bti_curl_buffer_free(curl_buf);
1008                                         return -EINVAL;
1009                                 }
1010
1011                                 doc = xmlReadMemory(curl_buf->data,
1012                                                     curl_buf->length,
1013                                                     "response.xml", NULL,
1014                                                     XML_PARSE_NOERROR);
1015                                 if (doc == NULL) {
1016                                         curl_easy_cleanup(curl);
1017                                         if (session->action == ACTION_UPDATE)
1018                                                 curl_formfree(formpost);
1019                                         bti_curl_buffer_free(curl_buf);
1020                                         return -EINVAL;
1021                                 }
1022
1023                                 current = xmlDocGetRootElement(doc);
1024                                 if (current == NULL) {
1025                                         fprintf(stderr, "empty document\n");
1026                                         xmlFreeDoc(doc);
1027                                         curl_easy_cleanup(curl);
1028                                         if (session->action == ACTION_UPDATE)
1029                                                 curl_formfree(formpost);
1030                                         bti_curl_buffer_free(curl_buf);
1031                                         return -EINVAL;
1032                                 }
1033
1034                                 if (xmlStrcmp(current->name, (const xmlChar *)"status")) {
1035                                         fprintf(stderr, "unexpected document type\n");
1036                                         xmlFreeDoc(doc);
1037                                         curl_easy_cleanup(curl);
1038                                         if (session->action == ACTION_UPDATE)
1039                                                 curl_formfree(formpost);
1040                                         bti_curl_buffer_free(curl_buf);
1041                                         return -EINVAL;
1042                                 }
1043
1044                                 xmlFreeDoc(doc);
1045                         }
1046                 }
1047
1048                 curl_easy_cleanup(curl);
1049                 if (session->action == ACTION_UPDATE)
1050                         curl_formfree(formpost);
1051                 bti_curl_buffer_free(curl_buf);
1052         } else {
1053                 switch (session->action) {
1054                 case ACTION_UPDATE:
1055                         /* dont test it here, let twitter return an error that we show */
1056                         if (strlen_utf8(session->tweet) > 140 + 1000 ) {
1057                                 printf("E: tweet is too long!\n");
1058                                 goto skip_tweet;
1059                         }
1060
1061                         /* TODO: add tweet crunching function. */
1062                         escaped_tweet = oauth_url_escape(session->tweet);
1063                         if (session->replyto) {
1064                                 sprintf(endpoint,
1065                                         "%s%s?status=%s&in_reply_to_status_id=%s",
1066                                         session->hosturl, update_uri,
1067                                         escaped_tweet, session->replyto);
1068                         } else {
1069                                 sprintf(endpoint, "%s%s?status=%s",
1070                                         session->hosturl, update_uri,
1071                                         escaped_tweet);
1072                         }
1073
1074                         is_post = 1;
1075                         break;
1076                 case ACTION_USER:
1077                         sprintf(endpoint, "%s%s?screen_name=%s&page=%d",
1078                                 session->hosturl, user_uri, session->user,
1079                                 session->page);
1080                         break;
1081                 case ACTION_REPLIES:
1082                         sprintf(endpoint, "%s%s?page=%d", session->hosturl,
1083                                 mentions_uri, session->page);
1084                         break;
1085                 case ACTION_PUBLIC:
1086                         sprintf(endpoint, "%s%s", twitter_host_stream,
1087                                 public_uri);
1088                         break;
1089                 case ACTION_GROUP:
1090                         sprintf(endpoint, "%s%s%s.xml?page=%d",
1091                                 session->hosturl, group_uri, session->group,
1092                                 session->page);
1093                         break;
1094                 case ACTION_FRIENDS:
1095                         sprintf(endpoint, "%s%s?page=%d", session->hosturl,
1096                                 friends_uri, session->page);
1097                         break;
1098                 case ACTION_RETWEET:
1099                         sprintf(endpoint, "%s%s%s.xml", session->hosturl,
1100                                 retweet_uri, session->retweet);
1101                         is_post = 1;
1102                         break;
1103                 case ACTION_DIRECT:
1104                         escaped_tweet = oauth_url_escape(session->tweet);
1105                         sprintf(endpoint, "%s%s?user=%s&text=%s", twitter_host_simple,
1106                                 direct_uri, session->user, escaped_tweet);
1107                         is_post = 1;
1108                         break;
1109                 default:
1110                         break;
1111                 }
1112
1113                 dbg("%s\n", endpoint);
1114                 if (!session->dry_run) {
1115                         if (is_post) {
1116                                 req_url = oauth_sign_url2(endpoint, &postarg, OA_HMAC,
1117                                                           NULL, session->consumer_key,
1118                                                           session->consumer_secret,
1119                                                           session->access_token_key,
1120                                                           session->access_token_secret);
1121                                 reply = oauth_http_post(req_url, postarg);
1122                         } else {
1123                                 req_url = oauth_sign_url2(endpoint, NULL, OA_HMAC, NULL,
1124                                                           session->consumer_key,
1125                                                           session->consumer_secret,
1126                                                           session->access_token_key,
1127                                                           session->access_token_secret);
1128                                 reply = oauth_http_get(req_url, postarg);
1129                         }
1130
1131                         dbg("req_url:%s\n", req_url);
1132                         dbg("reply:%s\n", reply);
1133                         if (req_url)
1134                                 free(req_url);
1135
1136                         if (!reply) {
1137                                 fprintf(stderr, "Error retrieving from URL (%s)\n", endpoint);
1138                                 return -EIO;
1139                         }
1140
1141                         if ((session->action != ACTION_UPDATE) &&
1142                                         (session->action != ACTION_RETWEET) &&
1143                                         (session->action != ACTION_DIRECT))
1144                                 parse_timeline_json(reply, session);
1145
1146                         if ((session->action == ACTION_UPDATE) ||
1147                                         (session->action == ACTION_DIRECT))
1148                                 /*return parse_response_xml(reply, session);*/
1149                                 return parse_response_json(reply, session);
1150                 }
1151
1152                 skip_tweet: ;
1153
1154         }
1155         return 0;
1156 }
1157
1158 static void log_session(struct session *session, int retval)
1159 {
1160         FILE *log_file;
1161         char *filename;
1162
1163         /* Only log something if we have a log file set */
1164         if (!session->logfile)
1165                 return;
1166
1167         filename = alloca(strlen(session->homedir) +
1168                           strlen(session->logfile) + 3);
1169
1170         sprintf(filename, "%s/%s", session->homedir, session->logfile);
1171
1172         log_file = fopen(filename, "a+");
1173         if (log_file == NULL)
1174                 return;
1175
1176         switch (session->action) {
1177         case ACTION_UPDATE:
1178                 if (retval)
1179                         fprintf(log_file, "%s: host=%s tweet failed\n",
1180                                 session->time, session->hostname);
1181                 else
1182                         fprintf(log_file, "%s: host=%s tweet=%s\n",
1183                                 session->time, session->hostname,
1184                                 session->tweet);
1185                 break;
1186         case ACTION_FRIENDS:
1187                 fprintf(log_file, "%s: host=%s retrieving friends timeline\n",
1188                         session->time, session->hostname);
1189                 break;
1190         case ACTION_USER:
1191                 fprintf(log_file, "%s: host=%s retrieving %s's timeline\n",
1192                         session->time, session->hostname, session->user);
1193                 break;
1194         case ACTION_REPLIES:
1195                 fprintf(log_file, "%s: host=%s retrieving replies\n",
1196                         session->time, session->hostname);
1197                 break;
1198         case ACTION_PUBLIC:
1199                 fprintf(log_file, "%s: host=%s retrieving public timeline\n",
1200                         session->time, session->hostname);
1201                 break;
1202         case ACTION_GROUP:
1203                 fprintf(log_file, "%s: host=%s retrieving group timeline\n",
1204                         session->time, session->hostname);
1205                 break;
1206         case ACTION_DIRECT:
1207                 if (retval)
1208                         fprintf(log_file, "%s: host=%s tweet failed\n",
1209                                 session->time, session->hostname);
1210                 else
1211                         fprintf(log_file, "%s: host=%s tweet=%s\n",
1212                                 session->time, session->hostname,
1213                                 session->tweet);
1214                 break;
1215         default:
1216                 break;
1217         }
1218
1219         fclose(log_file);
1220 }
1221
1222 static char *get_string_from_stdin(void)
1223 {
1224         char *temp;
1225         char *string;
1226
1227         string = zalloc(1000);
1228         if (!string)
1229                 return NULL;
1230
1231         if (!fgets(string, 999, stdin)) {
1232                 free(string);
1233                 return NULL;
1234         }
1235         temp = strchr(string, '\n');
1236         if (temp)
1237                 *temp = '\0';
1238         return string;
1239 }
1240
1241 static void read_password(char *buf, size_t len, char *host)
1242 {
1243         char pwd[80];
1244         struct termios old;
1245         struct termios tp;
1246
1247         tcgetattr(0, &tp);
1248         old = tp;
1249
1250         tp.c_lflag &= (~ECHO);
1251         tcsetattr(0, TCSANOW, &tp);
1252
1253         fprintf(stdout, "Enter password for %s: ", host);
1254         fflush(stdout);
1255         tcflow(0, TCOOFF);
1256
1257         /*
1258          * I'd like to do something with the return value here, but really,
1259          * what can be done?
1260          */
1261         (void)scanf("%79s", pwd);
1262
1263         tcflow(0, TCOON);
1264         fprintf(stdout, "\n");
1265
1266         tcsetattr(0, TCSANOW, &old);
1267
1268         strncpy(buf, pwd, len);
1269         buf[len-1] = '\0';
1270 }
1271
1272 static int find_urls(const char *tweet, int **pranges)
1273 {
1274         /*
1275          * magic obtained from
1276          * http://www.geekpedia.com/KB65_How-to-validate-an-URL-using-RegEx-in-Csharp.html
1277          */
1278         static const char *re_magic =
1279                 "(([a-zA-Z][0-9a-zA-Z+\\-\\.]*:)/{1,3}"
1280                 "[0-9a-zA-Z;/~?:@&=+$\\.\\-_'()%]+)"
1281                 "(#[0-9a-zA-Z;/?:@&=+$\\.\\-_!~*'()%]+)?";
1282         pcre *re;
1283         const char *errptr;
1284         int erroffset;
1285         int ovector[10] = {0,};
1286         const size_t ovsize = sizeof(ovector)/sizeof(*ovector);
1287         int startoffset, tweetlen;
1288         int i, rc;
1289         int rbound = 10;
1290         int rcount = 0;
1291         int *ranges = malloc(sizeof(int) * rbound);
1292
1293         re = pcre_compile(re_magic,
1294                         PCRE_NO_AUTO_CAPTURE,
1295                         &errptr, &erroffset, NULL);
1296         if (!re) {
1297                 fprintf(stderr, "pcre_compile @%u: %s\n", erroffset, errptr);
1298                 exit(1);
1299         }
1300
1301         tweetlen = strlen(tweet);
1302         for (startoffset = 0; startoffset < tweetlen; ) {
1303
1304                 rc = pcre_exec(re, NULL, tweet, strlen(tweet), startoffset, 0,
1305                                 ovector, ovsize);
1306                 if (rc == PCRE_ERROR_NOMATCH)
1307                         break;
1308
1309                 if (rc < 0) {
1310                         fprintf(stderr, "pcre_exec @%u: %s\n",
1311                                 erroffset, errptr);
1312                         exit(1);
1313                 }
1314
1315                 for (i = 0; i < rc; i += 2) {
1316                         if ((rcount+2) == rbound) {
1317                                 rbound *= 2;
1318                                 ranges = realloc(ranges, sizeof(int) * rbound);
1319                         }
1320
1321                         ranges[rcount++] = ovector[i];
1322                         ranges[rcount++] = ovector[i+1];
1323                 }
1324
1325                 startoffset = ovector[1];
1326         }
1327
1328         pcre_free(re);
1329
1330         *pranges = ranges;
1331         return rcount;
1332 }
1333
1334 /**
1335  * bidirectional popen() call
1336  *
1337  * @param rwepipe - int array of size three
1338  * @param exe - program to run
1339  * @param argv - argument list
1340  * @return pid or -1 on error
1341  *
1342  * The caller passes in an array of three integers (rwepipe), on successful
1343  * execution it can then write to element 0 (stdin of exe), and read from
1344  * element 1 (stdout) and 2 (stderr).
1345  */
1346 static int popenRWE(int *rwepipe, const char *exe, const char *const argv[])
1347 {
1348         int in[2];
1349         int out[2];
1350         int err[2];
1351         int pid;
1352         int rc;
1353
1354         rc = pipe(in);
1355         if (rc < 0)
1356                 goto error_in;
1357
1358         rc = pipe(out);
1359         if (rc < 0)
1360                 goto error_out;
1361
1362         rc = pipe(err);
1363         if (rc < 0)
1364                 goto error_err;
1365
1366         pid = fork();
1367         if (pid > 0) {
1368                 /* parent */
1369                 close(in[0]);
1370                 close(out[1]);
1371                 close(err[1]);
1372                 rwepipe[0] = in[1];
1373                 rwepipe[1] = out[0];
1374                 rwepipe[2] = err[0];
1375                 return pid;
1376         } else if (pid == 0) {
1377                 /* child */
1378                 close(in[1]);
1379                 close(out[0]);
1380                 close(err[0]);
1381                 close(0);
1382                 rc = dup(in[0]);
1383                 close(1);
1384                 rc = dup(out[1]);
1385                 close(2);
1386                 rc = dup(err[1]);
1387
1388                 execvp(exe, (char **)argv);
1389                 exit(1);
1390         } else
1391                 goto error_fork;
1392
1393         return pid;
1394
1395 error_fork:
1396         close(err[0]);
1397         close(err[1]);
1398 error_err:
1399         close(out[0]);
1400         close(out[1]);
1401 error_out:
1402         close(in[0]);
1403         close(in[1]);
1404 error_in:
1405         return -1;
1406 }
1407
1408 static int pcloseRWE(int pid, int *rwepipe)
1409 {
1410         int status;
1411         close(rwepipe[0]);
1412         close(rwepipe[1]);
1413         close(rwepipe[2]);
1414         (void)waitpid(pid, &status, 0);
1415         return status;
1416 }
1417
1418 static char *shrink_one_url(int *rwepipe, char *big)
1419 {
1420         int biglen = strlen(big);
1421         char *small;
1422         int smalllen;
1423         int rc;
1424
1425         rc = dprintf(rwepipe[0], "%s\n", big);
1426         if (rc < 0)
1427                 return big;
1428
1429         smalllen = biglen + 128;
1430         small = malloc(smalllen);
1431         if (!small)
1432                 return big;
1433
1434         rc = read(rwepipe[1], small, smalllen);
1435         if (rc < 0 || rc > biglen)
1436                 goto error_free_small;
1437
1438         if (strncmp(small, "http://", 7))
1439                 goto error_free_small;
1440
1441         smalllen = rc;
1442         while (smalllen && isspace(small[smalllen-1]))
1443                         small[--smalllen] = 0;
1444
1445         free(big);
1446         return small;
1447
1448 error_free_small:
1449         free(small);
1450         return big;
1451 }
1452
1453 static char *shrink_urls(char *text)
1454 {
1455         int *ranges;
1456         int rcount;
1457         int i;
1458         int inofs = 0;
1459         int outofs = 0;
1460         const char *const shrink_args[] = {
1461                 "bti-shrink-urls",
1462                 NULL
1463         };
1464         int shrink_pid;
1465         int shrink_pipe[3];
1466         int inlen = strlen(text);
1467
1468         dbg("before len=%u\n", inlen);
1469
1470         shrink_pid = popenRWE(shrink_pipe, shrink_args[0], shrink_args);
1471         if (shrink_pid < 0)
1472                 return text;
1473
1474         rcount = find_urls(text, &ranges);
1475         if (!rcount)
1476                 return text;
1477
1478         for (i = 0; i < rcount; i += 2) {
1479                 int url_start = ranges[i];
1480                 int url_end = ranges[i+1];
1481                 int long_url_len = url_end - url_start;
1482                 char *url = strndup(text + url_start, long_url_len);
1483                 int short_url_len;
1484                 int not_url_len = url_start - inofs;
1485
1486                 dbg("long  url[%u]: %s\n", long_url_len, url);
1487                 url = shrink_one_url(shrink_pipe, url);
1488                 short_url_len = url ? strlen(url) : 0;
1489                 dbg("short url[%u]: %s\n", short_url_len, url);
1490
1491                 if (!url || short_url_len >= long_url_len) {
1492                         /* The short url ended up being too long
1493                          * or unavailable */
1494                         if (inofs) {
1495                                 strncpy(text + outofs, text + inofs,
1496                                                 not_url_len + long_url_len);
1497                         }
1498                         inofs += not_url_len + long_url_len;
1499                         outofs += not_url_len + long_url_len;
1500
1501                 } else {
1502                         /* copy the unmodified block */
1503                         strncpy(text + outofs, text + inofs, not_url_len);
1504                         inofs += not_url_len;
1505                         outofs += not_url_len;
1506
1507                         /* copy the new url */
1508                         strncpy(text + outofs, url, short_url_len);
1509                         inofs += long_url_len;
1510                         outofs += short_url_len;
1511                 }
1512
1513                 free(url);
1514         }
1515
1516         /* copy the last block after the last match */
1517         if (inofs) {
1518                 int tail = inlen - inofs;
1519                 if (tail) {
1520                         strncpy(text + outofs, text + inofs, tail);
1521                         outofs += tail;
1522                 }
1523         }
1524
1525         free(ranges);
1526
1527         (void)pcloseRWE(shrink_pid, shrink_pipe);
1528
1529         text[outofs] = 0;
1530         dbg("after len=%u\n", outofs);
1531         return text;
1532 }
1533
1534 int main(int argc, char *argv[], char *envp[])
1535 {
1536         static const struct option options[] = {
1537                 { "debug", 0, NULL, 'd' },
1538                 { "verbose", 0, NULL, 'V' },
1539                 { "account", 1, NULL, 'a' },
1540                 { "password", 1, NULL, 'p' },
1541                 { "host", 1, NULL, 'H' },
1542                 { "proxy", 1, NULL, 'P' },
1543                 { "action", 1, NULL, 'A' },
1544                 { "user", 1, NULL, 'u' },
1545                 { "group", 1, NULL, 'G' },
1546                 { "logfile", 1, NULL, 'L' },
1547                 { "shrink-urls", 0, NULL, 's' },
1548                 { "help", 0, NULL, 'h' },
1549                 { "bash", 0, NULL, 'b' },
1550                 { "background", 0, NULL, 'B' },
1551                 { "dry-run", 0, NULL, 'n' },
1552                 { "page", 1, NULL, 'g' },
1553                 { "column", 1, NULL, 'o' },
1554                 { "version", 0, NULL, 'v' },
1555                 { "config", 1, NULL, 'c' },
1556                 { "replyto", 1, NULL, 'r' },
1557                 { "retweet", 1, NULL, 'w' },
1558                 { }
1559         };
1560         struct stat s;
1561         struct session *session;
1562         pid_t child;
1563         char *tweet;
1564         static char password[80];
1565         int retval = 0;
1566         int option;
1567         char *http_proxy;
1568         time_t t;
1569         int page_nr;
1570
1571         debug = 0;
1572
1573         session = session_alloc();
1574         if (!session) {
1575                 fprintf(stderr, "no more memory...\n");
1576                 return -1;
1577         }
1578
1579         /* get the current time so that we can log it later */
1580         time(&t);
1581         session->time = strdup(ctime(&t));
1582         session->time[strlen(session->time)-1] = 0x00;
1583
1584         find_config_file(session);
1585
1586         /* Set environment variables first, before reading command line options
1587          * or config file values. */
1588         http_proxy = getenv("http_proxy");
1589         if (http_proxy) {
1590                 if (session->proxy)
1591                         free(session->proxy);
1592                 session->proxy = strdup(http_proxy);
1593                 dbg("http_proxy = %s\n", session->proxy);
1594         }
1595
1596         bti_parse_configfile(session);
1597
1598         while (1) {
1599                 option = getopt_long_only(argc, argv,
1600                                           "dp:P:H:a:A:u:c:hg:o:G:sr:nVvw:",
1601                                           options, NULL);
1602                 if (option == -1)
1603                         break;
1604                 switch (option) {
1605                 case 'd':
1606                         debug = 1;
1607                         break;
1608                 case 'V':
1609                         session->verbose = 1;
1610                         break;
1611                 case 'a':
1612                         if (session->account)
1613                                 free(session->account);
1614                         session->account = strdup(optarg);
1615                         dbg("account = %s\n", session->account);
1616                         break;
1617                 case 'g':
1618                         page_nr = atoi(optarg);
1619                         dbg("page = %d\n", page_nr);
1620                         session->page = page_nr;
1621                         break;
1622                 case 'o':
1623                         session->column_output = atoi(optarg);
1624                         dbg("column_output = %d\n", session->column_output);
1625                         break;
1626                 case 'r':
1627                         session->replyto = strdup(optarg);
1628                         dbg("in_reply_to_status_id = %s\n", session->replyto);
1629                         break;
1630                 case 'w':
1631                         session->retweet = strdup(optarg);
1632                         dbg("Retweet ID = %s\n", session->retweet);
1633                         break;
1634                 case 'p':
1635                         if (session->password)
1636                                 free(session->password);
1637                         session->password = strdup(optarg);
1638                         dbg("password = %s\n", session->password);
1639                         break;
1640                 case 'P':
1641                         if (session->proxy)
1642                                 free(session->proxy);
1643                         session->proxy = strdup(optarg);
1644                         dbg("proxy = %s\n", session->proxy);
1645                         break;
1646                 case 'A':
1647                         if (strcasecmp(optarg, "update") == 0)
1648                                 session->action = ACTION_UPDATE;
1649                         else if (strcasecmp(optarg, "friends") == 0)
1650                                 session->action = ACTION_FRIENDS;
1651                         else if (strcasecmp(optarg, "user") == 0)
1652                                 session->action = ACTION_USER;
1653                         else if (strcasecmp(optarg, "replies") == 0)
1654                                 session->action = ACTION_REPLIES;
1655                         else if (strcasecmp(optarg, "public") == 0)
1656                                 session->action = ACTION_PUBLIC;
1657                         else if (strcasecmp(optarg, "group") == 0)
1658                                 session->action = ACTION_GROUP;
1659                         else if (strcasecmp(optarg, "retweet") == 0)
1660                                 session->action = ACTION_RETWEET;
1661                         else if (strcasecmp(optarg, "direct") == 0)
1662                                 session->action = ACTION_DIRECT;
1663                         else
1664                                 session->action = ACTION_UNKNOWN;
1665                         dbg("action = %d\n", session->action);
1666                         break;
1667                 case 'u':
1668                         if (session->user)
1669                                 free(session->user);
1670                         session->user = strdup(optarg);
1671                         dbg("user = %s\n", session->user);
1672                         break;
1673
1674                 case 'G':
1675                         if (session->group)
1676                                 free(session->group);
1677                         session->group = strdup(optarg);
1678                         dbg("group = %s\n", session->group);
1679                         break;
1680                 case 'L':
1681                         if (session->logfile)
1682                                 free(session->logfile);
1683                         session->logfile = strdup(optarg);
1684                         dbg("logfile = %s\n", session->logfile);
1685                         break;
1686                 case 's':
1687                         session->shrink_urls = 1;
1688                         break;
1689                 case 'H':
1690                         if (session->hosturl)
1691                                 free(session->hosturl);
1692                         if (session->hostname)
1693                                 free(session->hostname);
1694                         if (strcasecmp(optarg, "twitter") == 0) {
1695                                 session->host = HOST_TWITTER;
1696                                 session->hosturl = strdup(twitter_host);
1697                                 session->hostname = strdup(twitter_name);
1698                         } else {
1699                                 session->host = HOST_CUSTOM;
1700                                 session->hosturl = strdup(optarg);
1701                                 session->hostname = strdup(optarg);
1702                         }
1703                         dbg("host = %d\n", session->host);
1704                         break;
1705                 case 'b':
1706                         session->bash = 1;
1707                         /* fall-through intended */
1708                 case 'B':
1709                         session->background = 1;
1710                         break;
1711                 case 'c':
1712                         if (session->configfile)
1713                                 free(session->configfile);
1714                         session->configfile = strdup(optarg);
1715                         dbg("configfile = %s\n", session->configfile);
1716                         if (stat(session->configfile, &s) == -1) {
1717                                 fprintf(stderr,
1718                                         "Config file '%s' is not found.\n",
1719                                         session->configfile);
1720                                 goto exit;
1721                         }
1722
1723                         /*
1724                          * read the config file now.  Yes, this could override
1725                          * previously set options from the command line, but
1726                          * the user asked for it...
1727                          */
1728                         bti_parse_configfile(session);
1729                         break;
1730                 case 'h':
1731                         display_help();
1732                         goto exit;
1733                 case 'n':
1734                         session->dry_run = 1;
1735                         break;
1736                 case 'v':
1737                         display_version();
1738                         goto exit;
1739                 default:
1740                         display_help();
1741                         goto exit;
1742                 }
1743         }
1744
1745         session_readline_init(session);
1746         /*
1747          * Show the version to make it easier to determine what
1748          * is going on here
1749          */
1750         if (debug)
1751                 display_version();
1752
1753         if (session->host == HOST_TWITTER) {
1754                 if (!session->consumer_key || !session->consumer_secret) {
1755                         if (session->action == ACTION_USER ||
1756                                         session->action == ACTION_PUBLIC) {
1757                                 /*
1758                                  * Some actions may still work without
1759                                  * authentication
1760                                  */
1761                                 session->guest = 1;
1762                         } else {
1763                                 fprintf(stderr,
1764                                                 "Twitter no longer supports HTTP basic authentication.\n"
1765                                                 "Both consumer key, and consumer secret are required"
1766                                                 " for bti in order to behave as an OAuth consumer.\n");
1767                                 goto exit;
1768                         }
1769                 }
1770                 if (session->action == ACTION_GROUP) {
1771                         fprintf(stderr, "Groups only work in Identi.ca.\n");
1772                         goto exit;
1773                 }
1774         } else {
1775                 if (!session->consumer_key || !session->consumer_secret)
1776                         session->no_oauth = 1;
1777         }
1778
1779         if (session->no_oauth) {
1780                 if (!session->account) {
1781                         fprintf(stdout, "Enter account for %s: ",
1782                                 session->hostname);
1783                         session->account = session->readline(NULL);
1784                 }
1785                 if (!session->password) {
1786                         read_password(password, sizeof(password),
1787                                       session->hostname);
1788                         session->password = strdup(password);
1789                 }
1790         } else if (!session->guest) {
1791                 if (!session->access_token_key ||
1792                     !session->access_token_secret) {
1793                         request_access_token(session);
1794                         goto exit;
1795                 }
1796         }
1797
1798         if (session->action == ACTION_UNKNOWN) {
1799                 fprintf(stderr, "Unknown action, valid actions are:\n"
1800                         "'update', 'friends', 'public', 'replies', 'group', 'user' or 'direct'.\n");
1801                 goto exit;
1802         }
1803
1804         if (session->action == ACTION_GROUP && !session->group) {
1805                 fprintf(stdout, "Enter group name: ");
1806                 session->group = session->readline(NULL);
1807         }
1808
1809         if (session->action == ACTION_RETWEET) {
1810                 if (!session->retweet) {
1811                         char *rtid;
1812
1813                         fprintf(stdout, "Status ID to retweet: ");
1814                         rtid = get_string_from_stdin();
1815                         session->retweet = zalloc(strlen(rtid) + 10);
1816                         sprintf(session->retweet, "%s", rtid);
1817                         free(rtid);
1818                 }
1819
1820                 if (!session->retweet || strlen(session->retweet) == 0) {
1821                         dbg("no retweet?\n");
1822                         return -1;
1823                 }
1824
1825                 dbg("retweet ID = %s\n", session->retweet);
1826         }
1827
1828         if (session->action == ACTION_UPDATE || session->action == ACTION_DIRECT) {
1829                 if (session->background || !session->interactive)
1830                         tweet = get_string_from_stdin();
1831                 else
1832                         tweet = session->readline("tweet: ");
1833                 if (!tweet || strlen(tweet) == 0) {
1834                         dbg("no tweet?\n");
1835                         return -1;
1836                 }
1837
1838                 if (session->shrink_urls)
1839                         tweet = shrink_urls(tweet);
1840
1841                 session->tweet = zalloc(strlen(tweet) + 10);
1842                 if (session->bash)
1843                         sprintf(session->tweet, "%c %s",
1844                                 getuid() ? '$' : '#', tweet);
1845                 else
1846                         sprintf(session->tweet, "%s", tweet);
1847
1848                 free(tweet);
1849                 dbg("tweet = %s\n", session->tweet);
1850         }
1851
1852         if (session->page == 0)
1853                 session->page = 1;
1854         dbg("config file = %s\n", session->configfile);
1855         dbg("host = %d\n", session->host);
1856         dbg("action = %d\n", session->action);
1857
1858         /* fork ourself so that the main shell can get on
1859          * with it's life as we try to connect and handle everything
1860          */
1861         if (session->background) {
1862                 child = fork();
1863                 if (child) {
1864                         dbg("child is %d\n", child);
1865                         exit(0);
1866                 }
1867         }
1868
1869         retval = send_request(session);
1870         if (retval && !session->background)
1871                 fprintf(stderr, "operation failed\n");
1872
1873         log_session(session, retval);
1874 exit:
1875         session_readline_cleanup(session);
1876         session_free(session);
1877         return retval;
1878 }