netinfo.subproj/ni_useful.c

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
   7  * Reserved.  This file contains Original Code and/or Modifications of
   8  * Original Code as defined in and that are subject to the Apple Public
   9  * Source License Version 1.1 (the "License").  You may not use this file
  10  * except in compliance with the License.  Please obtain a copy of the
  11  * License at http://www.apple.com/publicsource and read it before using
  12  * this file.
  13  *
  14  * The Original Code and all software distributed under the License are
  15  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  16  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  17  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE OR NON- INFRINGEMENT.  Please see the
  19  * License for the specific language governing rights and limitations
  20  * under the License.
  21  *
  22  * @APPLE_LICENSE_HEADER_END@
  23  */
  24 /*
  25  * Useful stuff for programming netinfo
  26  * Copyright (C) 1989 by NeXT, Inc.
  27  */
  28 #include <stdlib.h>
  29 #include <netinfo/ni.h>
  30 #include <string.h>
  31 #include <ctype.h>
  32 #include <netdb.h>
  33 #include <stdio.h>
  34 #include <arpa/inet.h>
  35
  36 extern void *_ni_dup(void *);
  37
  38 static const char *
  39 eatslash(
  40          const char *path
  41          )
  42 {
  43         while (*path == '/') {
  44                 path++;
  45         }
  46         return (path);
  47 }
  48
  49 static void
  50 unescape(
  51          ni_name *name
  52          )
  53 {
  54         ni_name newname;
  55         ni_name p;
  56         int len;
  57         int i;
  58
  59         p = *name;
  60         len = strlen(p);
  61         newname = malloc(len + 1);
  62         for (i = 0; *p != 0; i++) {
  63                 if (*p == '\\') {
  64                         p++;
  65                 }
  66                 newname[i] = *p++;
  67         }
  68         ni_name_free(name);
  69         newname[i] = 0;
  70         *name = newname;
  71 }
  72
  73 static const char *
  74 escindex(
  75          const char *str,
  76          char ch
  77          )
  78 {
  79         char *p;
  80
  81         p = index(str, ch);
  82         if (p == NULL) {
  83                 return (NULL);
  84         }
  85         if (p == str) {
  86                 return (p);
  87         }
  88         if (p[-1] == '\\') {
  89                 return (escindex(p + 1, ch));
  90         }
  91         return (p);
  92 }
  93
  94 static void
  95 setstuff(
  96          void *ni,
  97          ni_fancyopenargs *args
  98          )
  99 {
 100         if (args != NULL) {
 101                 ni_setabort(ni, args->abort);
 102                 if (args->rtimeout) {
 103                         ni_setreadtimeout(ni, args->rtimeout);
 104                 }
 105                 if (args->wtimeout) {
 106                         ni_setwritetimeout(ni, args->wtimeout);
 107                 }
 108         }
 109 }
 110
 111 static void *
 112 ni_relopen(
 113            void *ni,
 114            const char *domain,
 115            int freeold,
 116            ni_fancyopenargs *args
 117            )
 118 {
 119         void *newni;
 120         void *tmpni;
 121         char *start;
 122         char *slash;
 123         char *component;
 124
 125         /* look for <tag>@<address> in last component of domain */
 126         start = (char *)domain;
 127         while ((slash = (char *)escindex(start, '/')) != NULL) {
 128                 /* found a slash, keep looking for the last one */
 129                 start = slash + 1;
 130         }
 131         if (index(start, '@') != NULL) {
 132                 /*
 133                  * last component in <tag>@<address> form, skip
 134                  * all of the leading components.
 135                  */
 136                 component = ni_name_dup(start);
 137                 newni = ni_new(NULL, component);
 138                 free(component);
 139                 if (newni != NULL && args != NULL)
 140                         setstuff(newni, args);
 141                 if (ni != NULL && freeold)
 142                         ni_free(ni);
 143                 return (newni);
 144         }
 145
 146         component = ni_name_dup(domain);
 147         slash = (char *)escindex(component, '/');
 148         if (slash != NULL) {
 149                 *slash = 0;
 150         }
 151         unescape(&component);
 152
 153         tmpni = NULL;
 154         if (ni != NULL && args != NULL) {
 155                 tmpni = _ni_dup(ni);
 156                 if (freeold) {
 157                         ni_free(ni);
 158                 }
 159                 ni = tmpni;
 160                 setstuff(ni, args);
 161         }
 162
 163         newni = ni_new(ni, component);
 164         free(component);
 165
 166         if (tmpni != NULL) {
 167                 ni_free(ni);
 168                 ni = NULL;
 169         }
 170
 171         if (ni != NULL && freeold) {
 172                 ni_free(ni);
 173         }
 174
 175
 176         if (newni == NULL) {
 177                 return (NULL);
 178         }
 179         setstuff(newni, args);
 180         ni = newni;
 181         if (slash != NULL) {
 182                 slash = (char *)escindex(domain, '/');
 183                 domain = eatslash(slash + 1);
 184                 return (ni_relopen(ni, domain, TRUE, NULL));
 185         } else {
 186                 return (ni);
 187         }
 188 }
 189
 190 static void *
 191 ni_rootopen(
 192             ni_fancyopenargs *args
 193             )
 194 {
 195         void *ni;
 196         void *newni;
 197
 198         ni = ni_new(NULL, ".");
 199         if (ni == NULL) {
 200                 return (NULL);
 201         }
 202         setstuff(ni, args);
 203         for (;;) {
 204                 newni = ni_new(ni, "..");
 205                 if (newni == NULL) {
 206                         break;
 207                 }
 208                 ni_free(ni);
 209                 ni = newni;
 210         }
 211         return (ni);
 212 }
 213
 214 static ni_name
 215 ni_name_dupn(
 216              ni_name_const start,
 217              ni_name_const stop
 218              )
 219 {
 220         int len;
 221         ni_name new;
 222
 223         if (stop != NULL) {
 224                 len = stop - start;
 225         } else {
 226                 len = strlen(start);
 227         }
 228         new = malloc(len + 1);
 229         bcopy(start, new, len);
 230         new[len] = 0;
 231         return (new);
 232 }
 233
 234
 235 static ni_status
 236 ni_relsearch(
 237              void *ni,
 238              const char *path,
 239              ni_id *id
 240              )
 241 {
 242         char *slash;
 243         char *equal;
 244         ni_name key;
 245         ni_name val;
 246         ni_idlist idl;
 247         ni_status status;
 248
 249         slash = (char *)escindex(path, '/');
 250         equal = (char *)escindex(path, '=');
 251         if (equal != NULL && (slash == NULL || equal < slash)) {
 252                 key = ni_name_dupn(path, equal);
 253                 val = ni_name_dupn(equal + 1, slash);
 254         } else {
 255                 if (equal == NULL || (slash != NULL && slash < equal)) {
 256                         key = ni_name_dup("name");
 257                         val = ni_name_dupn(path, slash);
 258                 } else {
 259                         key = ni_name_dupn(path, equal);
 260                         val = ni_name_dupn(equal + 1, slash);
 261                 }
 262         }
 263         unescape(&key);
 264         unescape(&val);
 265         status = ni_lookup(ni, id, key, val, &idl);
 266         if (status != NI_OK) {
 267                 ni_name_free(&key);
 268                 ni_name_free(&val);
 269                 return (status);
 270         }
 271         id->nii_object = idl.niil_val[0];
 272         ni_name_free(&key);
 273         ni_name_free(&val);
 274         ni_idlist_free(&idl);
 275         if (slash == NULL) {
 276                 ni_self(ni, id);
 277                 return (NI_OK);
 278         }
 279         path = eatslash(slash);
 280         return (ni_relsearch(ni, path, id));
 281 }
 282
 283 ni_status
 284 ni_open(
 285         void *ni,
 286         const char *domain,
 287         void **newni
 288         )
 289 {
 290         return (ni_fancyopen(ni, domain, newni, NULL));
 291 }
 292
 293 ni_status
 294 ni_fancyopen(
 295              void *ni,
 296              const char *domain,
 297              void **newni,
 298              ni_fancyopenargs *args
 299              )
 300 {
 301         void *tmp = NULL;
 302         int rootopen = 0;
 303
 304         if (*domain == '/') {
 305                 tmp = ni_rootopen(args);
 306                 if (tmp == NULL) {
 307                     return (NI_FAILED); /* XXX: should return real error */
 308                 }
 309                 domain = eatslash(domain);
 310                 ni = tmp;
 311                 rootopen++;
 312         }
 313         if (*domain != 0) {
 314                 tmp = ni_relopen(ni, domain, FALSE, args);
 315                 if (rootopen) {
 316                         ni_free(ni);
 317                 }
 318         }
 319         if (tmp == NULL) {
 320             return (NI_FAILED);
 321         }
 322         *newni = tmp;
 323         ni_needwrite(*newni, args == NULL ? 0 : args->needwrite);
 324         return (NI_OK);
 325 }
 326
 327 ni_status
 328 ni_pathsearch(
 329               void *ni,
 330               ni_id *id,
 331               const char *path
 332               )
 333 {
 334         ni_status status;
 335
 336         if (*path == '/') {
 337                 status = ni_root(ni, id);
 338                 if (status != NI_OK) {
 339                         return (status);
 340                 }
 341         }
 342         path = eatslash(path);
 343         if (*path != 0) {
 344                 status = ni_relsearch(ni, path, id);
 345                 if (status != NI_OK) {
 346                         return (status);
 347                 }
 348         }
 349         return (NI_OK);
 350 }
 351
 352 static char **
 353 _ni_append_string(char *s, char **l)
 354 {
 355         int i, len;
 356
 357         if (s == NULL) return l;
 358         if (l == NULL)
 359         {
 360                 l = (char **)malloc(2 * sizeof(char *));
 361                 l[0] = strdup(s);
 362                 l[1] = NULL;
 363                 return l;
 364         }
 365
 366         for (i = 0; l[i] != NULL; i++);
 367         len = i + 1; /* count the NULL on the end of the list too! */
 368
 369         l = (char **)realloc(l, (len + 1) * sizeof(char *));
 370
 371         l[len - 1] = strdup(s);
 372         l[len] = NULL;
 373         return l;
 374 }
 375
 376 static char **
 377 _ni_explode_string(char *s, char c)
 378 {
 379         char **l = NULL;
 380         char *p, *t;
 381         int i, n;
 382
 383         if (s == NULL) return NULL;
 384
 385         p = s;
 386         while (p[0] != '\0')
 387         {
 388                 for (i = 0; ((p[i] != '\0') && p[i] != c); i++);
 389                 n = i;
 390                 t = malloc(n + 1);
 391                 for (i = 0; i < n; i++) t[i] = p[i];
 392                 t[n] = '\0';
 393                 l = _ni_append_string(t, l);
 394                 free(t);
 395                 t = NULL;
 396                 if (p[i] == '\0') return l;
 397                 if (p[i + 1] == '\0') l = _ni_append_string("", l);
 398                 p = p + i + 1;
 399         }
 400         return l;
 401 }
 402
 403 static void
 404 _ni_free_list(char **l)
 405 {
 406         int i;
 407
 408         if (l == NULL) return;
 409         for (i = 0; l[i] != NULL; i++)
 410         {
 411                 if (l[i] != NULL) free(l[i]);
 412                 l[i] = NULL;
 413         }
 414         if (l != NULL) free(l);
 415 }
 416
 417 ni_status
 418 ni_host_domain(char *host, char *domspec, void **domain)
 419 {
 420         void *d0, *d1;
 421         struct sockaddr_in server;
 422         ni_name tag;
 423         int i, is_tag, is_local, is_relative;
 424         ni_status status;
 425         char **path;
 426         struct hostent *h;
 427
 428         is_local = 1;
 429
 430         /* NULL host implies localhost */
 431         if (host == NULL)
 432         {
 433                 server.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
 434         }
 435         else
 436         {
 437                 is_local = 0;
 438                 server.sin_addr.s_addr = inet_addr(host);
 439                 if (server.sin_addr.s_addr == -1)
 440                 {
 441                         h = gethostbyname(host);
 442                         if (h == NULL)
 443                         {
 444                                 *domain = (void *)NULL;
 445                                 return NI_CANTFINDADDRESS;
 446                         }
 447                         bcopy(h->h_addr_list[0], &server.sin_addr.s_addr, h->h_length);
 448                 }
 449         }
 450
 451         is_relative = 1;
 452         is_tag = 1;
 453
 454         if (domspec == NULL)
 455         {
 456                 is_tag = 0;
 457                 is_relative = 0;
 458         }
 459         else if (domspec[0] == '/')
 460         {
 461                 is_tag = 0;
 462                 is_relative = 0;
 463         }
 464         else if (!strcmp(domspec, ".")) is_tag = 0;
 465         else if (!strcmp(domspec, "..")) is_tag = 0;
 466         else if (!strncmp(domspec, "./", 2)) is_tag = 0;
 467         else if (!strncmp(domspec, "../", 3)) is_tag = 0;
 468
 469         if (is_tag == 1)
 470         {
 471                 d0 = ni_connect(&server, domspec);
 472                 status = ni_addrtag(d0, &server, &tag);
 473                 ni_name_free(&tag);
 474                 if (status != NI_OK)
 475                 {
 476                         *domain = (void *)NULL;
 477                         return NI_FAILED;
 478                 }
 479
 480                 *domain = d0;
 481                 return NI_OK;
 482         }
 483
 484         if (is_local)
 485         {
 486                 if (domspec == NULL) status = ni_open(NULL, ".", domain);
 487                 else status = ni_open(NULL, domspec, domain);
 488                 return status;
 489         }
 490
 491         d0 = ni_connect(&server, "local");
 492         status = ni_addrtag(d0, &server, &tag);
 493         ni_name_free(&tag);
 494         if (status != NI_OK)
 495         {
 496                 *domain = (void *)NULL;
 497                 return NI_FAILED;
 498         }
 499
 500         if ((domspec == NULL) || (!strcmp(domspec, ".")))
 501         {
 502                 *domain = d0;
 503                 return NI_OK;
 504         }
 505
 506         if (is_relative == 1)
 507         {
 508                 path = _ni_explode_string(domspec, '/');
 509         }
 510         else
 511         {
 512                 path = _ni_explode_string(domspec + 1, '/');
 513
 514                 status = NI_OK;
 515                 while (status == NI_OK)
 516                 {
 517                         status = ni_open(d0, "..", &d1);
 518                         if (status == NI_OK)
 519                         {
 520                                 ni_free(d0);
 521                                 d0 = d1;
 522                         }
 523                 }
 524
 525                 if (!strcmp(domspec, "/"))
 526                 {
 527                         *domain = d0;
 528                         return NI_OK;
 529                 }
 530         }
 531
 532         for (i = 0; path[i] != NULL; i++)
 533         {
 534                 status = ni_open(d0, path[i], &d1);
 535                 if (status != NI_OK)
 536                 {
 537                         _ni_free_list(path);
 538                         *domain = (void *)NULL;
 539                         return NI_FAILED;
 540                 }
 541                 ni_free(d0);
 542                 d0 = d1;
 543         }
 544
 545         _ni_free_list(path);
 546         *domain = d0;
 547         return NI_OK;
 548 }
 549
 550 static void
 551 _ni_parse_url_hostspec(char *s, char **u, char **p, char **h)
 552 {
 553
 554         char *p_at, *p_colon;
 555         int ulen, plen, hlen;
 556
 557         if (s == NULL) return;
 558         if (s[0] == '\0') return;
 559
 560         /* Check for [[[user][:[passwd]]]@]host */
 561         p_at = strchr(s, '@');
 562         if (p_at == NULL)
 563         {
 564                 hlen = strlen(s);
 565                 if (hlen == 0) return;
 566
 567                 *h = malloc(hlen + 1);
 568                 strcpy(*h, s);
 569                 return;
 570         }
 571
 572         *p_at = '\0';
 573         p_at++;
 574         hlen = strlen(p_at);
 575         if (hlen > 0)
 576         {
 577                 *h = malloc(hlen + 1);
 578                 strcpy(*h, p_at);
 579         }
 580
 581         if (s[0] == '\0') return;
 582
 583         p_colon = strchr(s, ':');
 584         if (p_colon == NULL)
 585         {
 586                 ulen = strlen(s);
 587                 if (ulen == 0) return;
 588
 589                 *u = malloc(ulen + 1);
 590                 strcpy(*u, s);
 591                 return;
 592         }
 593
 594         *p_colon = '\0';
 595         p_colon++;
 596         plen = strlen(p_colon);
 597         if (plen > 0)
 598         {
 599                 *p = malloc(plen + 1);
 600                 strcpy(*p, p_colon);
 601         }
 602
 603         ulen = strlen(s);
 604         if (ulen > 0)
 605         {
 606                 *u = malloc(ulen + 1);
 607                 strcpy(*u, s);
 608         }
 609 }
 610
 611 void
 612 ni_parse_url(char *url, char **user, char **password, char **host,
 613         char **domspec, char **dirspec)
 614 {
 615         int i, x, len;
 616         char *str;
 617
 618         *host = NULL;
 619         *user = NULL;
 620         *password = NULL;
 621         *domspec = NULL;
 622         *dirspec = NULL;
 623
 624         /*
 625          * url ::= "netinfo://" <hostspec> [/[<domainspec>][:[<dirspec>]]]
 626          * hostspec ::= [[[user][:[password]]]@]hostref
 627          * hostref ::= <inet_addr> | <hostname>
 628          * domainspec ::= <abs_domain> | <rel_domain>
 629          * dirspec ::= <path> | <unsigned_integer>
 630          */
 631
 632         x = strlen("netinfo://");
 633
 634         if (strncmp(url, "netinfo://", x)) return;
 635
 636         /*
 637          * Look for <hostspec> part
 638          * Defults to NULL user, password and host
 639          * NULL host implies localhost
 640          */
 641         len = 0;
 642         for (i = x; (url[i] != '\0') && (url[i] != '/'); i++) len++;
 643
 644         if (len != 0)
 645         {
 646                 str = malloc(len + 1);
 647                 bcopy(url + x, str, len);
 648                 str[len] = '\0';
 649
 650                 _ni_parse_url_hostspec(str, user, password, host);
 651
 652                 free(str);
 653         }
 654
 655         /*
 656          * Look for <domainspec> part
 657          * NULL domainspec implies "."
 658          */
 659         if (url[i] != '\0') i++;
 660         x = i;
 661         len = 0;
 662         for (; (url[i] != '\0') && (url[i] != ':'); i++) len++;
 663
 664         if (len > 0)
 665         {
 666                 *domspec = malloc(len + 1);
 667                 bcopy(url + x, *domspec, len);
 668                 (*domspec)[len] = '\0';
 669         }
 670
 671         /*
 672          * Look for <dirspec> part
 673          * NULL <dirspec> implies "/"
 674          */
 675         if (url[i] != '\0') i++;
 676         x = i;
 677         len = 0;
 678         for (; url[i] != '\0'; i++) len++;
 679         if (len > 0)
 680         {
 681                 *dirspec = malloc(len + 1);
 682                 bcopy(url + x, *dirspec, len);
 683                 (*dirspec)[len] = '\0';
 684         }
 685 }
 686
 687 ni_status
 688 ni_url(char *url, void **domain, ni_id *dir)
 689 {
 690         int nilen;
 691         char *user, *password, *host;
 692         char *domspec, *dirspec;
 693         ni_status status;
 694
 695         nilen = strlen("netinfo://");
 696
 697         if (strncmp(url, "netinfo://", nilen))
 698         {
 699                 *domain = (void *)NULL;
 700                 return NI_CANTFINDADDRESS;
 701         }
 702
 703         ni_parse_url(url, &user, &password, &host, &domspec, &dirspec);
 704
 705         status = ni_host_domain(host, domspec, domain);
 706         if (host != NULL) free(host);
 707         if (domspec != NULL) free(domspec);
 708         if (status != NI_OK)
 709         {
 710                         if (user != NULL) free(user);
 711                         if (password != NULL) free(password);
 712                         if (dirspec != NULL) free(dirspec);
 713                         return status;
 714         }
 715
 716         if (user != NULL)
 717         {
 718                 ni_setuser(*domain, user);
 719                 free(user);
 720         }
 721
 722         if (password != NULL)
 723         {
 724                 ni_setpassword(*domain, password);
 725                 free(password);
 726         }
 727
 728         if (dirspec == NULL)
 729         {
 730                 status = ni_root(*domain, dir);
 731                 return status;
 732         }
 733
 734         if ((dirspec[0] >= '0') && (dirspec[0] <= '9'))
 735         {
 736                 dir->nii_object = atoi(dirspec);
 737                 free(dirspec);
 738                 status = ni_self(*domain, dir);
 739                 return status;
 740         }
 741
 742         status = ni_pathsearch(*domain, dir, dirspec);
 743         free(dirspec);
 744         return status;
 745 }