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 /* Imports */
  19
  20 #include "port_before.h"
  21
  22 #include <sys/types.h>
  23 #include <netinet/in.h>
  24
  25 #include <stdio.h>
  26 #include <string.h>
  27 #include <netdb.h>
  28 #include <ctype.h>
  29 #include <stdlib.h>
  30 #include <errno.h>
  31
  32 #include <sys/types.h>
  33 #include <netinet/in.h>
  34 #include <arpa/nameser.h>
  35 #include <resolv.h>
  36
  37 #include <isc/memcluster.h>
  38 #include <irs.h>
  39
  40 #include "port_after.h"
  41
  42 #include "irs_p.h"
  43 #include "hesiod.h"
  44 #include "dns_p.h"
  45
  46 /* Definitions */
  47
  48 struct pvt {
  49         struct dns_p *          dns;
  50         struct servent          serv;
  51         char *                  svbuf;
  52         struct __res_state *    res;
  53         void                    (*free_res)(void *);
  54 };
  55
  56 /* Forward. */
  57
  58 static void                     sv_close(struct irs_sv *);
  59 static struct servent *         sv_byname(struct irs_sv *,
  60                                           const char *, const char *);
  61 static struct servent *         sv_byport(struct irs_sv *, int, const char *);
  62 static struct servent *         sv_next(struct irs_sv *);
  63 static void                     sv_rewind(struct irs_sv *);
  64 static void                     sv_minimize(struct irs_sv *);
  65 #ifdef SV_RES_SETGET
  66 static struct __res_state *     sv_res_get(struct irs_sv *);
  67 static void                     sv_res_set(struct irs_sv *,
  68                                            struct __res_state *,
  69                                            void (*)(void *));
  70 #endif
  71
  72 static struct servent *         parse_hes_list(struct irs_sv *,
  73                                                char **, const char *);
  74
  75 /* Public */
  76
  77 struct irs_sv *
  78 irs_dns_sv(struct irs_acc *this) {
  79         struct dns_p *dns = (struct dns_p *)this->private;
  80         struct irs_sv *sv;
  81         struct pvt *pvt;
  82
  83         if (!dns || !dns->hes_ctx) {
  84                 errno = ENODEV;
  85                 return (NULL);
  86         }
  87         if (!(pvt = memget(sizeof *pvt))) {
  88                 errno = ENOMEM;
  89                 return (NULL);
  90         }
  91         memset(pvt, 0, sizeof *pvt);
  92         pvt->dns = dns;
  93         if (!(sv = memget(sizeof *sv))) {
  94                 memput(pvt, sizeof *pvt);
  95                 errno = ENOMEM;
  96                 return (NULL);
  97         }
  98         memset(sv, 0x5e, sizeof *sv);
  99         sv->private = pvt;
 100         sv->byname = sv_byname;
 101         sv->byport = sv_byport;
 102         sv->next = sv_next;
 103         sv->rewind = sv_rewind;
 104         sv->close = sv_close;
 105         sv->minimize = sv_minimize;
 106 #ifdef SV_RES_SETGET
 107         sv->res_get = sv_res_get;
 108         sv->res_set = sv_res_set;
 109 #else
 110         sv->res_get = NULL; /*%< sv_res_get; */
 111         sv->res_set = NULL; /*%< sv_res_set; */
 112 #endif
 113         return (sv);
 114 }
 115
 116 /* Methods */
 117
 118 static void
 119 sv_close(struct irs_sv *this) {
 120         struct pvt *pvt = (struct pvt *)this->private;
 121
 122         free(pvt->serv.s_aliases);
 123         free(pvt->svbuf);
 124
 125         if (pvt->res && pvt->free_res)
 126                 (*pvt->free_res)(pvt->res);
 127         memput(pvt, sizeof *pvt);
 128         memput(this, sizeof *this);
 129 }
 130
 131 static struct servent *
 132 sv_byname(struct irs_sv *this, const char *name, const char *proto) {
 133         struct pvt *pvt = (struct pvt *)this->private;
 134         struct dns_p *dns = pvt->dns;
 135         struct servent *s;
 136         char **hes_list;
 137
 138         if (!(hes_list = hesiod_resolve(dns->hes_ctx, name, "service")))
 139                 return (NULL);
 140
 141         s = parse_hes_list(this, hes_list, proto);
 142         hesiod_free_list(dns->hes_ctx, hes_list);
 143         return (s);
 144 }
 145
 146 static struct servent *
 147 sv_byport(struct irs_sv *this, int port, const char *proto) {
 148         struct pvt *pvt = (struct pvt *)this->private;
 149         struct dns_p *dns = pvt->dns;
 150         struct servent *s;
 151         char portstr[16];
 152         char **hes_list;
 153
 154         sprintf(portstr, "%d", ntohs(port));
 155         if (!(hes_list = hesiod_resolve(dns->hes_ctx, portstr, "port")))
 156                 return (NULL);
 157
 158         s = parse_hes_list(this, hes_list, proto);
 159         hesiod_free_list(dns->hes_ctx, hes_list);
 160         return (s);
 161 }
 162
 163 static struct servent *
 164 sv_next(struct irs_sv *this) {
 165         UNUSED(this);
 166         errno = ENODEV;
 167         return (NULL);
 168 }
 169
 170 static void
 171 sv_rewind(struct irs_sv *this) {
 172         UNUSED(this);
 173         /* NOOP */
 174 }
 175
 176 /* Private */
 177
 178 static struct servent *
 179 parse_hes_list(struct irs_sv *this, char **hes_list, const char *proto) {
 180         struct pvt *pvt = (struct pvt *)this->private;
 181         char *p, *cp, **cpp, **new;
 182         int proto_len;
 183         int num = 0;
 184         int max = 0;
 185
 186         for (cpp = hes_list; *cpp; cpp++) {
 187                 cp = *cpp;
 188
 189                 /* Strip away comments, if any. */
 190                 if ((p = strchr(cp, '#')))
 191                         *p = 0;
 192
 193                 /* Check to make sure the protocol matches. */
 194                 p = cp;
 195                 while (*p && !isspace((unsigned char)*p))
 196                         p++;
 197                 if (!*p)
 198                         continue;
 199                 if (proto) {
 200                      proto_len = strlen(proto);
 201                      if (strncasecmp(++p, proto, proto_len) != 0)
 202                           continue;
 203                      if (p[proto_len] && !isspace(p[proto_len]&0xff))
 204                           continue;
 205                 }
 206                 /* OK, we've got a live one.  Let's parse it for real. */
 207                 free(pvt->svbuf);
 208                 pvt->svbuf = strdup(cp);
 209
 210                 p = pvt->svbuf;
 211                 pvt->serv.s_name = p;
 212                 while (*p && !isspace(*p&0xff))
 213                         p++;
 214                 if (!*p)
 215                         continue;
 216                 *p++ = '\0';
 217
 218                 pvt->serv.s_proto = p;
 219                 while (*p && !isspace(*p&0xff))
 220                         p++;
 221                 if (!*p)
 222                         continue;
 223                 *p++ = '\0';
 224
 225                 pvt->serv.s_port = htons((u_short) atoi(p));
 226                 while (*p && !isspace(*p&0xff))
 227                         p++;
 228                 if (*p)
 229                         *p++ = '\0';
 230
 231                 while (*p) {
 232                         if ((num + 1) >= max || !pvt->serv.s_aliases) {
 233                                 max += 10;
 234                                 new = reallocarray(pvt->serv.s_aliases, max,
 235                                     sizeof (char *));
 236                                 if (!new) {
 237                                         errno = ENOMEM;
 238                                         goto cleanup;
 239                                 }
 240                                 pvt->serv.s_aliases = new;
 241                         }
 242                         pvt->serv.s_aliases[num++] = p;
 243                         while (*p && !isspace(*p&0xff))
 244                                 p++;
 245                         if (*p)
 246                                 *p++ = '\0';
 247                 }
 248                 if (!pvt->serv.s_aliases)
 249                         pvt->serv.s_aliases = malloc(sizeof(char *));
 250                 if (!pvt->serv.s_aliases)
 251                         goto cleanup;
 252                 pvt->serv.s_aliases[num] = NULL;
 253                 return (&pvt->serv);
 254         }
 255
 256  cleanup:
 257         if (pvt->serv.s_aliases) {
 258                 free(pvt->serv.s_aliases);
 259                 pvt->serv.s_aliases = NULL;
 260         }
 261         if (pvt->svbuf) {
 262                 free(pvt->svbuf);
 263                 pvt->svbuf = NULL;
 264         }
 265         return (NULL);
 266 }
 267
 268 static void
 269 sv_minimize(struct irs_sv *this) {
 270         UNUSED(this);
 271         /* NOOP */
 272 }
 273
 274 #ifdef SV_RES_SETGET
 275 static struct __res_state *
 276 sv_res_get(struct irs_sv *this) {
 277         struct pvt *pvt = (struct pvt *)this->private;
 278         struct dns_p *dns = pvt->dns;
 279
 280         return (__hesiod_res_get(dns->hes_ctx));
 281 }
 282
 283 static void
 284 sv_res_set(struct irs_sv *this, struct __res_state * res,
 285            void (*free_res)(void *)) {
 286         struct pvt *pvt = (struct pvt *)this->private;
 287         struct dns_p *dns = pvt->dns;
 288
 289         __hesiod_res_set(dns->hes_ctx, res, free_res);
 290 }
 291 #endif
 292
 293 /*! \file */