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Implement lwres_getnamebyaddr()

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This commit is contained in:
Michael Graff 2000-01-18 01:54:42 +00:00
parent c1cfd8ef05
commit 0d9f5384a1
2 changed files with 106 additions and 0 deletions
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5
lib/lwres/include/lwres/lwres.h
View File

@ -350,6 +350,11 @@ int
lwres_getaddrsbyname(lwres_context_t *ctx, const char *name,
isc_uint32_t addrtypes, lwres_gabnresponse_t **structp);
int
lwres_getnamebyaddr(lwres_context_t *ctx, isc_uint32_t addrtype,
isc_uint16_t addrlen, unsigned char *addr,
lwres_gnbaresponse_t **structp);
ISC_LANG_ENDDECLS
#endif /* LWRES_LWRES_H */

101
lib/lwres/lwresutil.c
View File

@ -189,3 +189,104 @@ lwres_getaddrsbyname(lwres_context_t *ctx, const char *name,
return (ret);
}
int
lwres_getnamebyaddr(lwres_context_t *ctx, isc_uint32_t addrtype,
isc_uint16_t addrlen, unsigned char *addr,
lwres_gnbaresponse_t **structp)
{
lwres_gnbarequest_t request;
lwres_gnbaresponse_t *response;
int ret;
int free_b;
lwres_buffer_t b;
lwres_lwpacket_t pkt;
isc_uint32_t serial;
char *buffer;
REQUIRE(ctx != NULL);
REQUIRE(addrtype != 0);
REQUIRE(addrlen != 0);
REQUIRE(addr != NULL);
REQUIRE(structp != NULL && *structp == NULL);
response = NULL;
free_b = 0;
buffer = NULL;
serial = (isc_uint32_t)addr;
buffer = CTXMALLOC(LWRES_RECVLENGTH);
if (buffer == NULL) {
ret = -1;
goto out;
}
/*
* Set up our request and render it to a buffer.
*/
request.addr.family = addrtype;
request.addr.length = addrlen;
request.addr.address = addr;
pkt.flags = 0;
pkt.serial = serial;
pkt.result = 0;
pkt.recvlength = LWRES_RECVLENGTH;
ret = lwres_gnbarequest_render(ctx, &request, &pkt, &b);
if (ret != 0)
goto out;
free_b = 1;
ret = lwres_context_sendrecv(ctx, b.base, b.length, buffer,
LWRES_RECVLENGTH);
if (ret < 0)
goto out;
CTXFREE(b.base, b.length);
free_b = 0;
lwres_buffer_init(&b, buffer, ret);
/*
* Parse the packet header.
*/
ret = lwres_lwpacket_parseheader(&b, &pkt);
if (ret != 0)
goto out;
/*
* Sanity check.
*/
if (pkt.serial != serial) {
ret = -1;
goto out;
}
if (pkt.opcode != LWRES_OPCODE_GETNAMEBYADDR) {
ret = -1;
goto out;
}
/*
* Parse the response.
*/
ret = lwres_gnbaresponse_parse(ctx, &pkt, &b, &response);
if (ret != 0)
goto out;
response->base = buffer;
response->baselen = LWRES_RECVLENGTH;
buffer = NULL; /* don't free this below */
*structp = response;
return (0);
out:
if (free_b != 0)
CTXFREE(b.base, b.length);
if (buffer != NULL)
CTXFREE(buffer, LWRES_RECVLENGTH);
if (response != NULL)
lwres_gnbaresponse_free(ctx, &response);
return (ret);
}