contrib/bind-9.5.2/lib/bind/irs/nis_sv.c

   1 /*
   2  * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
   3  * Copyright (c) 1996,1999 by Internet Software Consortium.
   4  *
   5  * Permission to use, copy, modify, and distribute this software for any
   6  * purpose with or without fee is hereby granted, provided that the above
   7  * copyright notice and this permission notice appear in all copies.
   8  *
   9  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
  10  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  11  * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
  12  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  13  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  14  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
  15  * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  16  */
  17
  18 #if defined(LIBC_SCCS) && !defined(lint)
  19 static const char rcsid[] = "$Id: nis_sv.c,v 1.4 2005/04/27 04:56:34 sra Exp $";
  20 #endif /* LIBC_SCCS and not lint */
  21
  22 /* Imports */
  23
  24 #include "port_before.h"
  25
  26 #ifndef WANT_IRS_NIS
  27 static int __bind_irs_nis_unneeded;
  28 #else
  29
  30 #include <sys/types.h>
  31 #include <netinet/in.h>
  32 #include <arpa/nameser.h>
  33 #include <resolv.h>
  34 #include <sys/socket.h>
  35 #ifdef T_NULL
  36 #undef T_NULL                   /* Silence re-definition warning of T_NULL. */
  37 #endif
  38 #include <rpc/rpc.h>
  39 #include <rpc/xdr.h>
  40 #include <rpcsvc/yp_prot.h>
  41 #include <rpcsvc/ypclnt.h>
  42
  43 #include <ctype.h>
  44 #include <errno.h>
  45 #include <stdio.h>
  46 #include <stdlib.h>
  47 #include <string.h>
  48
  49 #include <isc/memcluster.h>
  50 #include <irs.h>
  51
  52 #include "port_after.h"
  53
  54 #include "irs_p.h"
  55 #include "nis_p.h"
  56
  57 /* Definitions */
  58
  59 struct pvt {
  60         int             needrewind;
  61         char *          nis_domain;
  62         char *          curkey_data;
  63         int             curkey_len;
  64         char *          curval_data;
  65         int             curval_len;
  66         char            line[BUFSIZ+1];
  67         struct servent  serv;
  68         char *          svbuf;
  69 };
  70
  71 enum do_what { do_none = 0x0, do_key = 0x1, do_val = 0x2, do_all = 0x3 };
  72
  73 static /*const*/ char services_byname[] = "services.byname";
  74
  75 /* Forward */
  76
  77 static void                     sv_close(struct irs_sv*);
  78 static struct servent *         sv_next(struct irs_sv *);
  79 static struct servent *         sv_byname(struct irs_sv *, const char *,
  80                                           const char *);
  81 static struct servent *         sv_byport(struct irs_sv *, int, const char *);
  82 static void                     sv_rewind(struct irs_sv *);
  83 static void                     sv_minimize(struct irs_sv *);
  84
  85 static struct servent *         makeservent(struct irs_sv *this);
  86 static void                     nisfree(struct pvt *, enum do_what);
  87
  88 /* Public */
  89
  90 struct irs_sv *
  91 irs_nis_sv(struct irs_acc *this) {
  92         struct irs_sv *sv;
  93         struct pvt *pvt;
  94
  95         if (!(sv = memget(sizeof *sv))) {
  96                 errno = ENOMEM;
  97                 return (NULL);
  98         }
  99         memset(sv, 0x5e, sizeof *sv);
 100         if (!(pvt = memget(sizeof *pvt))) {
 101                 memput(sv, sizeof *sv);
 102                 errno = ENOMEM;
 103                 return (NULL);
 104         }
 105         memset(pvt, 0, sizeof *pvt);
 106         pvt->needrewind = 1;
 107         pvt->nis_domain = ((struct nis_p *)this->private)->domain;
 108         sv->private = pvt;
 109         sv->close = sv_close;
 110         sv->next = sv_next;
 111         sv->byname = sv_byname;
 112         sv->byport = sv_byport;
 113         sv->rewind = sv_rewind;
 114         sv->minimize = sv_minimize;
 115         sv->res_get = NULL;
 116         sv->res_set = NULL;
 117         return (sv);
 118 }
 119
 120 /* Methods */
 121
 122 static void
 123 sv_close(struct irs_sv *this) {
 124         struct pvt *pvt = (struct pvt *)this->private;
 125
 126         nisfree(pvt, do_all);
 127         if (pvt->serv.s_aliases)
 128                 free(pvt->serv.s_aliases);
 129         if (pvt->svbuf)
 130                 free(pvt->svbuf);
 131         memput(pvt, sizeof *pvt);
 132         memput(this, sizeof *this);
 133 }
 134
 135 static struct servent *
 136 sv_byname(struct irs_sv *this, const char *name, const char *proto) {
 137         struct servent *serv;
 138         char **sap;
 139
 140         sv_rewind(this);
 141         while ((serv = sv_next(this)) != NULL) {
 142                 if (proto != NULL && strcmp(proto, serv->s_proto))
 143                         continue;
 144                 if (!strcmp(name, serv->s_name))
 145                         break;
 146                 for (sap = serv->s_aliases; sap && *sap; sap++)
 147                         if (!strcmp(name, *sap))
 148                                 break;
 149         }
 150         return (serv);
 151 }
 152
 153 static struct servent *
 154 sv_byport(struct irs_sv *this, int port, const char *proto) {
 155         struct servent *serv;
 156
 157         sv_rewind(this);
 158         while ((serv = sv_next(this)) != NULL) {
 159                 if (proto != NULL && strcmp(proto, serv->s_proto))
 160                         continue;
 161                 if (serv->s_port == port)
 162                         break;
 163         }
 164         return (serv);
 165 }
 166
 167 static void
 168 sv_rewind(struct irs_sv *this) {
 169         struct pvt *pvt = (struct pvt *)this->private;
 170
 171         pvt->needrewind = 1;
 172 }
 173
 174 static struct servent *
 175 sv_next(struct irs_sv *this) {
 176         struct pvt *pvt = (struct pvt *)this->private;
 177         struct servent *rval;
 178         int r;
 179
 180         do {
 181                 if (pvt->needrewind) {
 182                         nisfree(pvt, do_all);
 183                         r = yp_first(pvt->nis_domain, services_byname,
 184                                      &pvt->curkey_data, &pvt->curkey_len,
 185                                      &pvt->curval_data, &pvt->curval_len);
 186                         pvt->needrewind = 0;
 187                 } else {
 188                         char *newkey_data;
 189                         int newkey_len;
 190
 191                         nisfree(pvt, do_val);
 192                         r = yp_next(pvt->nis_domain, services_byname,
 193                                     pvt->curkey_data, pvt->curkey_len,
 194                                     &newkey_data, &newkey_len,
 195                                     &pvt->curval_data, &pvt->curval_len);
 196                         nisfree(pvt, do_key);
 197                         pvt->curkey_data = newkey_data;
 198                         pvt->curkey_len = newkey_len;
 199                 }
 200                 if (r != 0) {
 201                         errno = ENOENT;
 202                         return (NULL);
 203                 }
 204                 rval = makeservent(this);
 205         } while (rval == NULL);
 206         return (rval);
 207 }
 208
 209 static void
 210 sv_minimize(struct irs_sv *this) {
 211         UNUSED(this);
 212         /* NOOP */
 213 }
 214
 215 /* Private */
 216
 217 static struct servent *
 218 makeservent(struct irs_sv *this) {
 219         struct pvt *pvt = (struct pvt *)this->private;
 220         static const char spaces[] = " \t";
 221         char *p, **t;
 222         int n, m;
 223
 224         if (pvt->svbuf)
 225                 free(pvt->svbuf);
 226         pvt->svbuf = pvt->curval_data;
 227         pvt->curval_data = NULL;
 228
 229         if (pvt->serv.s_aliases) {
 230                 free(pvt->serv.s_aliases);
 231                 pvt->serv.s_aliases = NULL;
 232         }
 233
 234         if ((p = strpbrk(pvt->svbuf, "#\n")))
 235                 *p = '\0';
 236
 237         p = pvt->svbuf;
 238
 239         pvt->serv.s_name = p;
 240         p += strcspn(p, spaces);
 241         if (!*p)
 242                 goto cleanup;
 243         *p++ = '\0';
 244         p += strspn(p, spaces);
 245
 246         pvt->serv.s_port = htons((u_short) atoi(p));
 247         pvt->serv.s_proto = NULL;
 248
 249         while (*p && !isspace((unsigned char)*p))
 250                 if (*p++ == '/')
 251                         pvt->serv.s_proto = p;
 252         if (!pvt->serv.s_proto)
 253                 goto cleanup;
 254         if (*p) {
 255                 *p++ = '\0';
 256                 p += strspn(p, spaces);
 257         }
 258
 259         n = m = 0;
 260         while (*p) {
 261                 if ((n + 1) >= m || !pvt->serv.s_aliases) {
 262                         m += 10;
 263                         t = realloc(pvt->serv.s_aliases, m * sizeof(char *));
 264                         if (!t) {
 265                                 errno = ENOMEM;
 266                                 goto cleanup;
 267                         }
 268                         pvt->serv.s_aliases = t;
 269                 }
 270                 pvt->serv.s_aliases[n++] = p;
 271                 p += strcspn(p, spaces);
 272                 if (!*p)
 273                         break;
 274                 *p++ = '\0';
 275                 p += strspn(p, spaces);
 276         }
 277         if (!pvt->serv.s_aliases)
 278                 pvt->serv.s_aliases = malloc(sizeof(char *));
 279         if (!pvt->serv.s_aliases)
 280                 goto cleanup;
 281         pvt->serv.s_aliases[n] = NULL;
 282         return (&pvt->serv);
 283
 284  cleanup:
 285         if (pvt->serv.s_aliases) {
 286                 free(pvt->serv.s_aliases);
 287                 pvt->serv.s_aliases = NULL;
 288         }
 289         if (pvt->svbuf) {
 290                 free(pvt->svbuf);
 291                 pvt->svbuf = NULL;
 292         }
 293         return (NULL);
 294 }
 295
 296 static void
 297 nisfree(struct pvt *pvt, enum do_what do_what) {
 298         if ((do_what & do_key) && pvt->curkey_data) {
 299                 free(pvt->curkey_data);
 300                 pvt->curkey_data = NULL;
 301         }
 302         if ((do_what & do_val) && pvt->curval_data) {
 303                 free(pvt->curval_data);
 304                 pvt->curval_data = NULL;
 305         }
 306 }
 307
 308 #endif /*WANT_IRS_NIS*/
 309
 310 /*! \file */