src/core/sipe-utils.c

   1 /**
   2  * @file sipe-utils.c
   3  *
   4  * pidgin-sipe
   5  *
   6  * Copyright (C) 2009-2013 SIPE Project <http://sipe.sourceforge.net/>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  21  */
  22
  23 #include <stdlib.h>
  24 #include <stdio.h>
  25 #include <string.h>
  26 #include <ctype.h>
  27
  28 #include <glib.h>
  29
  30 #include "sipe-backend.h"
  31 #include "sipe-core.h"    /* to ensure same API for backends */
  32 #include "sipe-core-private.h"
  33 #include "sipe-utils.h"
  34 #include "uuid.h"
  35
  36 /* Generate 16 random bits */
  37 #define RANDOM16BITS (rand() & 0xFFFF)
  38
  39 gchar *gencallid(void)
  40 {
  41         return g_strdup_printf("%04Xg%04Xa%04Xi%04Xm%04Xt%04Xb%04Xx%04Xx",
  42                                RANDOM16BITS, RANDOM16BITS, RANDOM16BITS,
  43                                RANDOM16BITS, RANDOM16BITS, RANDOM16BITS,
  44                                RANDOM16BITS, RANDOM16BITS);
  45 }
  46
  47 gchar *gentag(void)
  48 {
  49         return g_strdup_printf("%04d%04d", RANDOM16BITS, RANDOM16BITS);
  50 }
  51
  52 gchar *genconfid(void)
  53 {
  54         return g_strdup_printf("%04X%04X%04X%04X%04X%04X%04X%04X",
  55                                RANDOM16BITS, RANDOM16BITS, RANDOM16BITS,
  56                                RANDOM16BITS, RANDOM16BITS, RANDOM16BITS,
  57                                RANDOM16BITS, RANDOM16BITS);
  58 }
  59
  60 gchar *get_contact(const struct sipe_core_private *sipe_private)
  61 {
  62         return g_strdup(sipe_private->contact);
  63 }
  64
  65 gchar *parse_from(const gchar *hdr)
  66 {
  67         gchar *from;
  68         const gchar *tmp, *tmp2 = hdr;
  69
  70         if (!hdr) return NULL;
  71         SIPE_DEBUG_INFO("parsing address out of %s", hdr);
  72         tmp = strchr(hdr, '<');
  73
  74         /* i hate the different SIP UA behaviours... */
  75         if (tmp) { /* sip address in <...> */
  76                 tmp2 = tmp + 1;
  77                 tmp = strchr(tmp2, '>');
  78                 if (tmp) {
  79                         from = g_strndup(tmp2, tmp - tmp2);
  80                 } else {
  81                         SIPE_DEBUG_INFO_NOFORMAT("found < without > in From");
  82                         return NULL;
  83                 }
  84         } else {
  85                 tmp = strchr(tmp2, ';');
  86                 if (tmp) {
  87                         from = g_strndup(tmp2, tmp - tmp2);
  88                 } else {
  89                         from = g_strdup(tmp2);
  90                 }
  91         }
  92         SIPE_DEBUG_INFO("got %s", from);
  93         return from;
  94 }
  95
  96 gchar *sip_uri_from_name(const gchar *name)
  97 {
  98         return(g_strdup_printf("sip:%s", name));
  99 }
 100
 101 gchar *sip_uri(const gchar *string)
 102 {
 103         return(strstr(string, "sip:") ? g_strdup(string) : sip_uri_from_name(string));
 104 }
 105
 106 static gchar *escape_uri_part(const gchar *in, guint len)
 107 {
 108         gchar *escaped = NULL;
 109
 110         if (len) {
 111                 gchar *s;
 112
 113                 /* reserve space for worst case, i.e. every character needs escaping */
 114                 escaped = s = g_malloc(3 * len + 1);
 115                 while (len--) {
 116                         gchar c = *in++;
 117
 118                         /* only allow ASCII characters */
 119                         if (!isascii(c)) {
 120                                 g_free(escaped);
 121                                 return(NULL);
 122                         }
 123
 124                         /*
 125                          * RFC 3986 Appendix A
 126                          *
 127                          * authority     = [ userinfo "@" ] host [ ":" port ]
 128                          * userinfo      = *( unreserved / pct-encoded / sub-delims / ":" )
 129                          * host          = IP-literal / IPv4address / reg-name
 130                          * reg-name      = *( unreserved / pct-encoded / sub-delims )
 131                          * pct-encoded   = "%" HEXDIG HEXDIG
 132                          * unreserved    = ALPHA / DIGIT / "-" / "." / "_" / "~"
 133                          *
 134                          * Escape everything that isn't in "unreserved"
 135                          */
 136                         if (isalnum(c) ||
 137                             (c == '.') ||
 138                             (c == '-') ||
 139                             (c == '_') ||
 140                             (c == '~')) {
 141                                 *s++ = c;
 142                         } else {
 143                                 sprintf(s, "%%%1X%1X", c / 16, c % 16);
 144                                 s += 3;
 145                         }
 146                 }
 147                 *s = '\0';
 148         }
 149
 150         return(escaped);
 151 }
 152
 153 gchar *sip_uri_if_valid(const gchar *string)
 154 {
 155         /* strip possible sip: prefix */
 156         const gchar *uri = sipe_get_no_sip_uri(string);
 157         const gchar *at;
 158         gchar *result    = NULL;
 159
 160         /* only XXX@YYY is valid */
 161         if (uri && ((at = strchr(uri, '@')) != NULL)) {
 162                 gchar *userinfo = escape_uri_part(uri, at - uri);
 163
 164                 if (userinfo) {
 165                         gchar *host = escape_uri_part(at + 1, strlen(at + 1));
 166
 167                         if (host) {
 168                                 /* name is valid for URI, convert it */
 169                                 result = g_strdup_printf("sip:%s@%s",
 170                                                          userinfo,
 171                                                          host);
 172                                 g_free(host);
 173                         }
 174                         g_free(userinfo);
 175                 }
 176         }
 177
 178         return(result);
 179 }
 180
 181 const gchar *sipe_get_no_sip_uri(const gchar *sip_uri)
 182 {
 183 #define SIP_PREFIX "sip:"
 184
 185         if (!sip_uri) return NULL;
 186
 187         if (g_str_has_prefix(sip_uri, SIP_PREFIX)) {
 188                 return(sip_uri + strlen(SIP_PREFIX));
 189         } else {
 190                 return sip_uri;
 191         }
 192 }
 193
 194 gchar *
 195 get_epid(struct sipe_core_private *sipe_private)
 196 {
 197         if (!sipe_private->epid) {
 198                 gchar *self_sip_uri = sip_uri_self(sipe_private);
 199                 sipe_private->epid = sipe_get_epid(self_sip_uri,
 200                                                    g_get_host_name(),
 201                                                    sipe_backend_network_ip_address(SIPE_CORE_PUBLIC));
 202                 g_free(self_sip_uri);
 203         }
 204         return g_strdup(sipe_private->epid);
 205 }
 206
 207 gchar *get_uuid(struct sipe_core_private *sipe_private)
 208 {
 209         gchar *epid = get_epid(sipe_private);
 210         gchar *uuid = generateUUIDfromEPID(epid);
 211         g_free(epid);
 212         return(uuid);
 213 }
 214
 215
 216 guint
 217 sipe_get_pub_instance(struct sipe_core_private *sipe_private,
 218                       int publication_key)
 219 {
 220         unsigned res = 0;
 221         gchar *epid = get_epid(sipe_private);
 222
 223         sscanf(epid, "%08x", &res);
 224         g_free(epid);
 225
 226         if (publication_key == SIPE_PUB_DEVICE) {
 227                 /* as is */
 228         } else if (publication_key == SIPE_PUB_STATE_MACHINE) {         /* First hexadecimal digit is 0x3 */
 229                 res = (res >> 4) | 0x30000000;
 230         } else if (publication_key == SIPE_PUB_STATE_USER) {
 231                 res = 0x20000000; /* fixed */
 232         } else if (publication_key == SIPE_PUB_STATE_CALENDAR) {        /* First hexadecimal digit is 0x4 */
 233                 res = (res >> 4) | 0x40000000;
 234         } else if (publication_key == SIPE_PUB_STATE_CALENDAR_OOF) {    /* First hexadecimal digit is 0x5 */
 235                 res = (res >> 4) | 0x50000000;
 236         } else if (publication_key == SIPE_PUB_CALENDAR_DATA ||
 237                    publication_key == SIPE_PUB_NOTE_OOF)
 238         { /* First hexadecimal digit is 0x4 */
 239                 unsigned calendar_id = 0;
 240                 char *mail_hash = sipe_get_epid(sipe_private->email, "", "");
 241
 242                 sscanf(mail_hash, "%08x", &calendar_id);
 243                 g_free(mail_hash);
 244                 res = (calendar_id >> 4) | 0x40000000;
 245         } else if (publication_key == SIPE_PUB_STATE_PHONE_VOIP) {      /* First hexadecimal digit is 0x8 */
 246                 res = (res >> 4) | 0x80000000;
 247         }
 248
 249         return res;
 250 }
 251
 252 gboolean
 253 sipe_is_bad_alias(const char *uri,
 254                   const char *alias)
 255 {
 256         char *uri_alias;
 257         gboolean result = FALSE;
 258
 259         if (!uri) return FALSE;
 260         if (!alias) return TRUE;
 261
 262         if (g_str_has_prefix(alias, "sip:") || g_str_has_prefix(alias, "sips:")) return TRUE;
 263
 264         /* check if alias is just SIP URI but without 'sip:' prefix */
 265         uri_alias = sip_uri_from_name(alias);
 266         if (sipe_strcase_equal(uri, uri_alias)) {
 267                 result = TRUE;
 268         }
 269         g_free(uri_alias);
 270
 271         return result;
 272 }
 273
 274 gboolean
 275 is_empty(const char *st)
 276 {
 277         if (!st || strlen(st) == 0)
 278         {
 279                 return TRUE;
 280         }
 281         /* suspecious leading or trailing staces */
 282         else if (isspace((unsigned char) *st) ||
 283                  isspace((unsigned char) *(st + strlen(st) - 1)))
 284         {
 285                 /* to not modify original string */
 286                 char *dup = g_strdup(st);
 287                 if (strlen(g_strstrip(dup)) == 0) {
 288                         g_free(dup);
 289                         return TRUE;
 290                 }
 291                 g_free(dup);
 292         }
 293         return FALSE;
 294 }
 295
 296 /** Returns newly allocated string. Must be g_free()'d */
 297 char *
 298 replace(const char *st,
 299         const char *search,
 300         const char *replace)
 301 {
 302         char **tmp;
 303         char *res;
 304
 305         if (!st) return NULL;
 306
 307         res = g_strjoinv(replace, tmp = g_strsplit(st, search, -1));
 308         g_strfreev(tmp);
 309         return res;
 310 }
 311
 312 void sipe_utils_message_debug(const gchar *type,
 313                               const gchar *header,
 314                               const gchar *body,
 315                               gboolean sending)
 316 {
 317         if (sipe_backend_debug_enabled()) {
 318                 GString *str         = g_string_new("");
 319                 GTimeVal currtime;
 320                 gchar *time_str;
 321                 const char *marker   = sending ?
 322                         ">>>>>>>>>>" :
 323                         "<<<<<<<<<<";
 324                 gchar *tmp;
 325
 326                 g_get_current_time(&currtime);
 327                 time_str = g_time_val_to_iso8601(&currtime);
 328                 g_string_append_printf(str, "\nMESSAGE START %s %s - %s\n", marker, type, time_str);
 329                 g_string_append(str, tmp = replace(header, "\r\n", "\n"));
 330                 g_free(tmp);
 331                 g_string_append(str, "\n");
 332                 if (body) {
 333                         g_string_append(str, tmp = replace(body, "\r\n", "\n"));
 334                         g_free(tmp);
 335                         g_string_append(str, "\n");
 336                 }
 337                 g_string_append_printf(str, "MESSAGE END %s %s - %s", marker, type, time_str);
 338                 g_free(time_str);
 339                 SIPE_DEBUG_INFO_NOFORMAT(str->str);
 340                 g_string_free(str, TRUE);
 341         }
 342 }
 343
 344 gboolean
 345 sipe_strequal(const gchar *left, const gchar *right)
 346 {
 347 #if GLIB_CHECK_VERSION(2,16,0)
 348         return (g_strcmp0(left, right) == 0);
 349 #else
 350         return ((left == NULL && right == NULL) ||
 351                 (left != NULL && right != NULL && strcmp(left, right) == 0));
 352 #endif
 353 }
 354
 355 gboolean
 356 sipe_strcase_equal(const gchar *left, const gchar *right)
 357 {
 358         return ((left == NULL && right == NULL) ||
 359                 (left != NULL && right != NULL && g_ascii_strcasecmp(left, right) == 0));
 360 }
 361
 362 gint sipe_strcompare(gconstpointer a, gconstpointer b)
 363 {
 364 #if GLIB_CHECK_VERSION(2,16,0)
 365         return (g_strcmp0(a, b));
 366 #else
 367         if (!a)
 368                 return -(a != b);
 369         if (!b)
 370                 return a != b;
 371         return strcmp(a, b);
 372 #endif
 373 }
 374
 375 time_t
 376 sipe_utils_str_to_time(const gchar *timestamp)
 377 {
 378         GTimeVal time;
 379         guint len;
 380
 381         /* We have to make sure that the ISO8601 contains a time zone offset,
 382            otherwise the time is interpreted as local time, not UTC!
 383            @TODO: is there a better way to check this? */
 384         if (timestamp && (len = strlen(timestamp) > 0) &&
 385             isdigit(timestamp[len - 1])) {
 386                 gchar *tmp = g_strdup_printf("%sZ", timestamp);
 387                 g_time_val_from_iso8601(tmp, &time);
 388                 g_free(tmp);
 389         } else {
 390                 g_time_val_from_iso8601(timestamp, &time);
 391         }
 392         return time.tv_sec;
 393 }
 394
 395 gchar *
 396 sipe_utils_time_to_str(time_t timestamp)
 397 {
 398         GTimeVal time = { timestamp, 0 };
 399         return g_time_val_to_iso8601(&time);
 400 }
 401
 402 size_t
 403 hex_str_to_buff(const char *hex_str, guint8 **buff)
 404 {
 405         char two_digits[3];
 406         size_t length;
 407         size_t i;
 408
 409         if (!buff) return 0;
 410         if (!hex_str) return 0;
 411
 412         length = strlen(hex_str)/2;
 413         *buff = (unsigned char *)g_malloc(length);
 414         for (i = 0; i < length; i++) {
 415                 two_digits[0] = hex_str[i * 2];
 416                 two_digits[1] = hex_str[i * 2 + 1];
 417                 two_digits[2] = '\0';
 418                 (*buff)[i] = (unsigned char)strtoul(two_digits, NULL, 16);
 419         }
 420
 421         return length;
 422 }
 423
 424 char *
 425 buff_to_hex_str(const guint8 *buff, const size_t buff_len)
 426 {
 427         char *res;
 428         size_t i, j;
 429
 430         if (!buff) return NULL;
 431
 432         res = g_malloc(buff_len * 2 + 1);
 433         for (i = 0, j = 0; i < buff_len; i++, j+=2) {
 434                 sprintf(&res[j], "%02X", buff[i]);
 435         }
 436         res[j] = '\0';
 437         return res;
 438 }
 439
 440 gboolean
 441 sipe_utils_parse_lines(GSList **list, gchar **lines, gchar *delimiter)
 442 {
 443         int i;
 444         gchar **parts;
 445         gchar *dummy;
 446         gchar *dummy2;
 447         gchar *tmp;
 448
 449         for(i = 0; lines[i] && strlen(lines[i]) > 2; i++) {
 450                 parts = g_strsplit(lines[i], delimiter, 2);
 451                 if(!parts[0] || !parts[1]) {
 452                         g_strfreev(parts);
 453                         return FALSE;
 454                 }
 455                 dummy = parts[1];
 456                 dummy2 = 0;
 457                 while(*dummy==' ' || *dummy=='\t') dummy++;
 458                 dummy2 = g_strdup(dummy);
 459                 while(lines[i+1] && (lines[i+1][0]==' ' || lines[i+1][0]=='\t')) {
 460                         i++;
 461                         dummy = lines[i];
 462                         while(*dummy==' ' || *dummy=='\t') dummy++;
 463                         tmp = g_strdup_printf("%s %s",dummy2, dummy);
 464                         g_free(dummy2);
 465                         dummy2 = tmp;
 466                 }
 467                 *list = sipe_utils_nameval_add(*list, parts[0], dummy2);
 468                 g_free(dummy2);
 469                 g_strfreev(parts);
 470         }
 471
 472         return TRUE;
 473 }
 474
 475 GSList*
 476 sipe_utils_nameval_add(GSList* list, const gchar *name, const gchar *value)
 477 {
 478         struct sipnameval *element = g_new0(struct sipnameval,1);
 479
 480         /* SANITY CHECK: the calling code must be fixed if this happens! */
 481         if (!value) {
 482                 SIPE_DEBUG_ERROR("sipe_utils_nameval_add: NULL value for %s",
 483                                  name);
 484                 value = "";
 485         }
 486
 487         element->name = g_strdup(name);
 488         element->value = g_strdup(value);
 489         return g_slist_append(list, element);
 490 }
 491
 492 void
 493 sipe_utils_nameval_free(GSList *list) {
 494         struct sipnameval *elem;
 495         while(list) {
 496                 elem = list->data;
 497                 list = g_slist_remove(list,elem);
 498                 g_free(elem->name);
 499                 g_free(elem->value);
 500                 g_free(elem);
 501         }
 502 }
 503
 504 const gchar *
 505 sipe_utils_nameval_find(const GSList *list, const gchar *name)
 506 {
 507         return sipe_utils_nameval_find_instance (list, name, 0);
 508 }
 509
 510 const gchar *
 511 sipe_utils_nameval_find_instance(const GSList *list, const gchar *name, int which)
 512 {
 513         const GSList *tmp;
 514         struct sipnameval *elem;
 515         int i = 0;
 516         tmp = list;
 517         while(tmp) {
 518                 elem = tmp->data;
 519                 // OCS2005 can send the same header in either all caps or mixed case
 520                 if (sipe_strcase_equal(elem->name, name)) {
 521                         if (i == which) {
 522                                 return elem->value;
 523                         }
 524                         i++;
 525                 }
 526                 tmp = g_slist_next(tmp);
 527         }
 528         return NULL;
 529 }
 530
 531 gchar *sipe_utils_str_replace(const gchar *string,
 532                               const gchar *delimiter,
 533                               const gchar *replacement)
 534 {
 535         gchar **split;
 536         gchar *result;
 537
 538         if (!string || !delimiter || !replacement) return NULL;
 539
 540         split = g_strsplit(string, delimiter, 0);
 541         result = g_strjoinv(replacement, split);
 542         g_strfreev(split);
 543
 544         return result;
 545 }
 546
 547 void sipe_utils_shrink_buffer(struct sipe_transport_connection *conn,
 548                               const gchar *unread)
 549 {
 550         conn->buffer_used -= unread - conn->buffer;
 551         /* string terminator is not included in buffer_used */
 552         memmove(conn->buffer, unread, conn->buffer_used + 1);
 553 }
 554
 555 gboolean sipe_utils_ip_is_private(const char *ip)
 556 {
 557         return g_str_has_prefix(ip, "10.")      ||
 558                g_str_has_prefix(ip, "172.16.")  ||
 559                g_str_has_prefix(ip, "192.168.");
 560 }
 561
 562 gchar *sipe_utils_presence_key(const gchar *uri)
 563 {
 564         return g_strdup_printf("<presence><%s>", uri);
 565 }
 566
 567 gchar *sipe_utils_subscription_key(const gchar *event,
 568                                    const gchar *uri)
 569 {
 570         gchar *key = NULL;
 571
 572         if (!is_empty(event)) {
 573                 if (!g_ascii_strcasecmp(event, "presence")) {
 574                         /* Subscription is identified by <presence><uri> key */
 575                         key = sipe_utils_presence_key(uri);
 576                 } else {
 577                         /* Subscription is identified by <event> key */
 578                         key = g_strdup_printf("<%s>", event);
 579                 }
 580         }
 581
 582         return key;
 583 }
 584
 585 gchar *
 586 sipe_utils_uri_unescape(const gchar *string)
 587 {
 588         gchar *unescaped;
 589         gchar *tmp;
 590
 591         if (!string)
 592                 return NULL;
 593
 594 #if GLIB_CHECK_VERSION(2,16,0)
 595         unescaped = g_uri_unescape_string(string, NULL);
 596 #else
 597         // based on libpurple/util.c:purple_url_decode()
 598         {
 599                 GString *buf = g_string_new(NULL);
 600                 size_t len = strlen(string);
 601                 char hex[3];
 602
 603                 hex[2] = '\0';
 604
 605                 while (len--) {
 606                         gchar c = *string++;
 607
 608                         if ((len >= 2) && (c == '%')) {
 609                                 strncpy(hex, string, 2);
 610                                 c = strtol(hex, NULL, 16);
 611
 612                                 string += 2;
 613                                 len -= 2;
 614                         }
 615
 616                         g_string_append_c(buf, c);
 617                 }
 618
 619                 unescaped = g_string_free(buf, FALSE);
 620         }
 621 #endif
 622         if (unescaped && !g_utf8_validate(unescaped, -1, (const gchar **)&tmp))
 623                 *tmp = '\0';
 624
 625         return unescaped;
 626 }
 627
 628 /**
 629  * Only appends if no such value already stored.
 630  * Like Set in Java.
 631  */
 632 GSList *
 633 slist_insert_unique_sorted(GSList *list, gpointer data, GCompareFunc func) {
 634         GSList * res = list;
 635         if (!g_slist_find_custom(list, data, func)) {
 636                 res = g_slist_insert_sorted(list, data, func);
 637         }
 638         return res;
 639 }
 640
 641 /*
 642   Local Variables:
 643   mode: c
 644   c-file-style: "bsd"
 645   indent-tabs-mode: t
 646   tab-width: 8
 647   End:
 648 */