usr/src/lib/libresolv2/common/irs/dns_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: dns_sv.c,v 1.5 2005/04/27 04:56:23 sra Exp $";
  20 #endif
  21
  22 /* Imports */
  23
  24 #include "port_before.h"
  25
  26 #include <sys/types.h>
  27 #include <netinet/in.h>
  28
  29 #include <stdio.h>
  30 #include <string.h>
  31 #include <netdb.h>
  32 #include <ctype.h>
  33 #include <stdlib.h>
  34 #include <errno.h>
  35
  36 #include <sys/types.h>
  37 #include <netinet/in.h>
  38 #include <arpa/nameser.h>
  39 #include <resolv.h>
  40
  41 #include <isc/memcluster.h>
  42 #include <irs.h>
  43
  44 #include "port_after.h"
  45
  46 #include "irs_p.h"
  47 #include "hesiod.h"
  48 #include "dns_p.h"
  49
  50 /* Definitions */
  51
  52 struct pvt {
  53         struct dns_p *          dns;
  54         struct servent          serv;
  55         char *                  svbuf;
  56         struct __res_state *    res;
  57         void                    (*free_res)(void *);
  58 };
  59
  60 /* Forward. */
  61
  62 static void                     sv_close(struct irs_sv *);
  63 static struct servent *         sv_byname(struct irs_sv *,
  64                                           const char *, const char *);
  65 static struct servent *         sv_byport(struct irs_sv *, int, const char *);
  66 static struct servent *         sv_next(struct irs_sv *);
  67 static void                     sv_rewind(struct irs_sv *);
  68 static void                     sv_minimize(struct irs_sv *);
  69 #ifdef SV_RES_SETGET
  70 static struct __res_state *     sv_res_get(struct irs_sv *);
  71 static void                     sv_res_set(struct irs_sv *,
  72                                            struct __res_state *,
  73                                            void (*)(void *));
  74 #endif
  75
  76 static struct servent *         parse_hes_list(struct irs_sv *,
  77                                                char **, const char *);
  78
  79 /* Public */
  80
  81 struct irs_sv *
  82 irs_dns_sv(struct irs_acc *this) {
  83         struct dns_p *dns = (struct dns_p *)this->private;
  84         struct irs_sv *sv;
  85         struct pvt *pvt;
  86
  87         if (!dns || !dns->hes_ctx) {
  88                 errno = ENODEV;
  89                 return (NULL);
  90         }
  91         if (!(pvt = memget(sizeof *pvt))) {
  92                 errno = ENOMEM;
  93                 return (NULL);
  94         }
  95         memset(pvt, 0, sizeof *pvt);
  96         pvt->dns = dns;
  97         if (!(sv = memget(sizeof *sv))) {
  98                 memput(pvt, sizeof *pvt);
  99                 errno = ENOMEM;
 100                 return (NULL);
 101         }
 102         memset(sv, 0x5e, sizeof *sv);
 103         sv->private = pvt;
 104         sv->byname = sv_byname;
 105         sv->byport = sv_byport;
 106         sv->next = sv_next;
 107         sv->rewind = sv_rewind;
 108         sv->close = sv_close;
 109         sv->minimize = sv_minimize;
 110 #ifdef SV_RES_SETGET
 111         sv->res_get = sv_res_get;
 112         sv->res_set = sv_res_set;
 113 #else
 114         sv->res_get = NULL; /*%< sv_res_get; */
 115         sv->res_set = NULL; /*%< sv_res_set; */
 116 #endif
 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         free(pvt->serv.s_aliases);
 127         free(pvt->svbuf);
 128
 129         if (pvt->res && pvt->free_res)
 130                 (*pvt->free_res)(pvt->res);
 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 pvt *pvt = (struct pvt *)this->private;
 138         struct dns_p *dns = pvt->dns;
 139         struct servent *s;
 140         char **hes_list;
 141
 142         if (!(hes_list = hesiod_resolve(dns->hes_ctx, name, "service")))
 143                 return (NULL);
 144
 145         s = parse_hes_list(this, hes_list, proto);
 146         hesiod_free_list(dns->hes_ctx, hes_list);
 147         return (s);
 148 }
 149
 150 static struct servent *
 151 sv_byport(struct irs_sv *this, int port, const char *proto) {
 152         struct pvt *pvt = (struct pvt *)this->private;
 153         struct dns_p *dns = pvt->dns;
 154         struct servent *s;
 155         char portstr[16];
 156         char **hes_list;
 157
 158         sprintf(portstr, "%d", ntohs(port));
 159         if (!(hes_list = hesiod_resolve(dns->hes_ctx, portstr, "port")))
 160                 return (NULL);
 161
 162         s = parse_hes_list(this, hes_list, proto);
 163         hesiod_free_list(dns->hes_ctx, hes_list);
 164         return (s);
 165 }
 166
 167 static struct servent *
 168 sv_next(struct irs_sv *this) {
 169         UNUSED(this);
 170         errno = ENODEV;
 171         return (NULL);
 172 }
 173
 174 static void
 175 sv_rewind(struct irs_sv *this) {
 176         UNUSED(this);
 177         /* NOOP */
 178 }
 179
 180 /* Private */
 181
 182 static struct servent *
 183 parse_hes_list(struct irs_sv *this, char **hes_list, const char *proto) {
 184         struct pvt *pvt = (struct pvt *)this->private;
 185         char *p, *cp, **cpp, **new;
 186         int proto_len;
 187         int num = 0;
 188         int max = 0;
 189
 190         for (cpp = hes_list; *cpp; cpp++) {
 191                 cp = *cpp;
 192
 193                 /* Strip away comments, if any. */
 194                 if ((p = strchr(cp, '#')))
 195                         *p = 0;
 196
 197                 /* Check to make sure the protocol matches. */
 198                 p = cp;
 199                 while (*p && !isspace((unsigned char)*p))
 200                         p++;
 201                 if (!*p)
 202                         continue;
 203                 if (proto) {
 204                      proto_len = strlen(proto);
 205                      if (strncasecmp(++p, proto, proto_len) != 0)
 206                           continue;
 207                      if (p[proto_len] && !isspace(p[proto_len]&0xff))
 208                           continue;
 209                 }
 210                 /* OK, we've got a live one.  Let's parse it for real. */
 211                 free(pvt->svbuf);
 212                 pvt->svbuf = strdup(cp);
 213
 214                 p = pvt->svbuf;
 215                 pvt->serv.s_name = p;
 216                 while (*p && !isspace(*p&0xff))
 217                         p++;
 218                 if (!*p)
 219                         continue;
 220                 *p++ = '\0';
 221
 222                 pvt->serv.s_proto = p;
 223                 while (*p && !isspace(*p&0xff))
 224                         p++;
 225                 if (!*p)
 226                         continue;
 227                 *p++ = '\0';
 228
 229                 pvt->serv.s_port = htons((u_short) atoi(p));
 230                 while (*p && !isspace(*p&0xff))
 231                         p++;
 232                 if (*p)
 233                         *p++ = '\0';
 234
 235                 while (*p) {
 236                         if ((num + 1) >= max || !pvt->serv.s_aliases) {
 237                                 max += 10;
 238                                 new = reallocarray(pvt->serv.s_aliases, max,
 239                                     sizeof (char *));
 240                                 if (!new) {
 241                                         errno = ENOMEM;
 242                                         goto cleanup;
 243                                 }
 244                                 pvt->serv.s_aliases = new;
 245                         }
 246                         pvt->serv.s_aliases[num++] = p;
 247                         while (*p && !isspace(*p&0xff))
 248                                 p++;
 249                         if (*p)
 250                                 *p++ = '\0';
 251                 }
 252                 if (!pvt->serv.s_aliases)
 253                         pvt->serv.s_aliases = malloc(sizeof(char *));
 254                 if (!pvt->serv.s_aliases)
 255                         goto cleanup;
 256                 pvt->serv.s_aliases[num] = NULL;
 257                 return (&pvt->serv);
 258         }
 259
 260  cleanup:
 261         if (pvt->serv.s_aliases) {
 262                 free(pvt->serv.s_aliases);
 263                 pvt->serv.s_aliases = NULL;
 264         }
 265         if (pvt->svbuf) {
 266                 free(pvt->svbuf);
 267                 pvt->svbuf = NULL;
 268         }
 269         return (NULL);
 270 }
 271
 272 static void
 273 sv_minimize(struct irs_sv *this) {
 274         UNUSED(this);
 275         /* NOOP */
 276 }
 277
 278 #ifdef SV_RES_SETGET
 279 static struct __res_state *
 280 sv_res_get(struct irs_sv *this) {
 281         struct pvt *pvt = (struct pvt *)this->private;
 282         struct dns_p *dns = pvt->dns;
 283
 284         return (__hesiod_res_get(dns->hes_ctx));
 285 }
 286
 287 static void
 288 sv_res_set(struct irs_sv *this, struct __res_state * res,
 289            void (*free_res)(void *)) {
 290         struct pvt *pvt = (struct pvt *)this->private;
 291         struct dns_p *dns = pvt->dns;
 292
 293         __hesiod_res_set(dns->hes_ctx, res, free_res);
 294 }
 295 #endif
 296
 297 /*! \file */