2 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
3 * Copyright (c) 1996,1999 by Internet Software Consortium.
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.
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.
18 #if defined(LIBC_SCCS) && !defined(lint)
19 static const char rcsid[] = "$Id: dns_sv.c,v 1.3.206.1 2004/03/09 08:33:34 marka Exp $";
24 #include "port_before.h"
26 #include <sys/types.h>
27 #include <netinet/in.h>
36 #include <sys/types.h>
37 #include <netinet/in.h>
38 #include <arpa/nameser.h>
41 #include <isc/memcluster.h>
44 #include "port_after.h"
56 struct __res_state * res;
57 void (*free_res)(void *);
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 *);
70 static struct __res_state * sv_res_get(struct irs_sv *);
71 static void sv_res_set(struct irs_sv *,
76 static struct servent * parse_hes_list(struct irs_sv *,
77 char **, const char *);
82 irs_dns_sv(struct irs_acc *this) {
83 struct dns_p *dns = (struct dns_p *)this->private;
87 if (!dns || !dns->hes_ctx) {
91 if (!(pvt = memget(sizeof *pvt))) {
95 memset(pvt, 0, sizeof *pvt);
97 if (!(sv = memget(sizeof *sv))) {
98 memput(pvt, sizeof *pvt);
102 memset(sv, 0x5e, sizeof *sv);
104 sv->byname = sv_byname;
105 sv->byport = sv_byport;
107 sv->rewind = sv_rewind;
108 sv->close = sv_close;
109 sv->minimize = sv_minimize;
111 sv->res_get = sv_res_get;
112 sv->res_set = sv_res_set;
114 sv->res_get = NULL; /* sv_res_get; */
115 sv->res_set = NULL; /* sv_res_set; */
123 sv_close(struct irs_sv *this) {
124 struct pvt *pvt = (struct pvt *)this->private;
126 if (pvt->serv.s_aliases)
127 free(pvt->serv.s_aliases);
131 if (pvt->res && pvt->free_res)
132 (*pvt->free_res)(pvt->res);
133 memput(pvt, sizeof *pvt);
134 memput(this, sizeof *this);
137 static struct servent *
138 sv_byname(struct irs_sv *this, const char *name, const char *proto) {
139 struct pvt *pvt = (struct pvt *)this->private;
140 struct dns_p *dns = pvt->dns;
144 if (!(hes_list = hesiod_resolve(dns->hes_ctx, name, "service")))
147 s = parse_hes_list(this, hes_list, proto);
148 hesiod_free_list(dns->hes_ctx, hes_list);
152 static struct servent *
153 sv_byport(struct irs_sv *this, int port, const char *proto) {
154 struct pvt *pvt = (struct pvt *)this->private;
155 struct dns_p *dns = pvt->dns;
160 sprintf(portstr, "%d", ntohs(port));
161 if (!(hes_list = hesiod_resolve(dns->hes_ctx, portstr, "port")))
164 s = parse_hes_list(this, hes_list, proto);
165 hesiod_free_list(dns->hes_ctx, hes_list);
169 static struct servent *
170 sv_next(struct irs_sv *this) {
177 sv_rewind(struct irs_sv *this) {
184 static struct servent *
185 parse_hes_list(struct irs_sv *this, char **hes_list, const char *proto) {
186 struct pvt *pvt = (struct pvt *)this->private;
187 char *p, *cp, **cpp, **new;
192 for (cpp = hes_list; *cpp; cpp++) {
195 /* Strip away comments, if any. */
196 if ((p = strchr(cp, '#')))
199 /* Check to make sure the protocol matches. */
201 while (*p && !isspace((unsigned char)*p))
206 proto_len = strlen(proto);
207 if (strncasecmp(++p, proto, proto_len) != 0)
209 if (p[proto_len] && !isspace(p[proto_len]&0xff))
212 /* OK, we've got a live one. Let's parse it for real. */
215 pvt->svbuf = strdup(cp);
218 pvt->serv.s_name = p;
219 while (*p && !isspace(*p&0xff))
225 pvt->serv.s_proto = p;
226 while (*p && !isspace(*p&0xff))
232 pvt->serv.s_port = htons((u_short) atoi(p));
233 while (*p && !isspace(*p&0xff))
239 if ((num + 1) >= max || !pvt->serv.s_aliases) {
241 new = realloc(pvt->serv.s_aliases,
242 max * sizeof(char *));
247 pvt->serv.s_aliases = new;
249 pvt->serv.s_aliases[num++] = p;
250 while (*p && !isspace(*p&0xff))
255 if (!pvt->serv.s_aliases)
256 pvt->serv.s_aliases = malloc(sizeof(char *));
257 if (!pvt->serv.s_aliases)
259 pvt->serv.s_aliases[num] = NULL;
264 if (pvt->serv.s_aliases) {
265 free(pvt->serv.s_aliases);
266 pvt->serv.s_aliases = NULL;
276 sv_minimize(struct irs_sv *this) {
282 static struct __res_state *
283 sv_res_get(struct irs_sv *this) {
284 struct pvt *pvt = (struct pvt *)this->private;
285 struct dns_p *dns = pvt->dns;
287 return (__hesiod_res_get(dns->hes_ctx));
291 sv_res_set(struct irs_sv *this, struct __res_state * res,
292 void (*free_res)(void *)) {
293 struct pvt *pvt = (struct pvt *)this->private;
294 struct dns_p *dns = pvt->dns;
296 __hesiod_res_set(dns->hes_ctx, res, free_res);