#include <config.h>
#include <stdio.h>
#include <string.h>
#include <lwres/lwres.h>
#include <lwres/net.h>
#include <lwres/netdb.h>
#include "assert_p.h"
#define SUCCESS 0
static struct afd {
int a_af;
size_t a_addrlen;
size_t a_socklen;
} afdl [] = {
{ AF_INET, sizeof(struct in_addr), sizeof(struct sockaddr_in) },
{ AF_INET6, sizeof(struct in6_addr), sizeof(struct sockaddr_in6) },
{0, 0, 0},
};
#define ENI_NOSERVNAME 1
#define ENI_NOHOSTNAME 2
#define ENI_MEMORY 3
#define ENI_SYSTEM 4
#define ENI_FAMILY 5
#define ENI_SALEN 6
#define ENI_NOSOCKET 7
#define ERR(code) \
do { result = (code); \
if (result != 0) goto cleanup; \
} while (0)
int
lwres_getnameinfo(const struct sockaddr *sa, size_t salen, char *host,
size_t hostlen, char *serv, size_t servlen, int flags)
{
struct afd *afd;
struct servent *sp;
unsigned short port;
#ifdef LWRES_PLATFORM_HAVESALEN
size_t len;
#endif
int family, i;
const void *addr;
char *p;
#if 0
unsigned long v4a;
unsigned char pfx;
#endif
char numserv[sizeof("65000")];
char numaddr[sizeof("abcd:abcd:abcd:abcd:abcd:abcd:255.255.255.255")
+ 1 + sizeof("4294967295")];
const char *proto;
lwres_uint32_t lwf = 0;
lwres_context_t *lwrctx = NULL;
lwres_gnbaresponse_t *by = NULL;
int result = SUCCESS;
int n;
if (sa == NULL)
ERR(ENI_NOSOCKET);
#ifdef LWRES_PLATFORM_HAVESALEN
len = sa->sa_len;
if (len != salen)
ERR(ENI_SALEN);
#endif
family = sa->sa_family;
for (i = 0; afdl[i].a_af; i++)
if (afdl[i].a_af == family) {
afd = &afdl[i];
goto found;
}
ERR(ENI_FAMILY);
found:
if (salen != afd->a_socklen)
ERR(ENI_SALEN);
switch (family) {
case AF_INET:
port = ((const struct sockaddr_in *)sa)->sin_port;
addr = &((const struct sockaddr_in *)sa)->sin_addr.s_addr;
break;
case AF_INET6:
port = ((const struct sockaddr_in6 *)sa)->sin6_port;
addr = ((const struct sockaddr_in6 *)sa)->sin6_addr.s6_addr;
break;
default:
port = 0;
addr = NULL;
INSIST(0);
}
proto = (flags & NI_DGRAM) ? "udp" : "tcp";
if (serv == NULL || servlen == 0) {
} else if ((flags & NI_NUMERICSERV) != 0 ||
(sp = getservbyport(port, proto)) == NULL) {
sprintf(numserv, "%d", ntohs(port));
if ((strlen(numserv) + 1) > servlen)
ERR(ENI_MEMORY);
strcpy(serv, numserv);
} else {
if ((strlen(sp->s_name) + 1) > servlen)
ERR(ENI_MEMORY);
strcpy(serv, sp->s_name);
}
#if 0
switch (sa->sa_family) {
case AF_INET:
v4a = ((struct sockaddr_in *)sa)->sin_addr.s_addr;
if (IN_MULTICAST(v4a) || IN_EXPERIMENTAL(v4a))
flags |= NI_NUMERICHOST;
v4a >>= IN_CLASSA_NSHIFT;
if (v4a == 0 || v4a == IN_LOOPBACKNET)
flags |= NI_NUMERICHOST;
break;
case AF_INET6:
pfx = ((struct sockaddr_in6 *)sa)->sin6_addr.s6_addr[0];
if (pfx == 0 || pfx == 0xfe || pfx == 0xff)
flags |= NI_NUMERICHOST;
break;
}
#endif
if (host == NULL || hostlen == 0) {
} else if (flags & NI_NUMERICHOST) {
if (lwres_net_ntop(afd->a_af, addr, numaddr, sizeof(numaddr))
== NULL)
ERR(ENI_SYSTEM);
#if defined(LWRES_HAVE_SIN6_SCOPE_ID)
if (afd->a_af == AF_INET6 &&
((const struct sockaddr_in6 *)sa)->sin6_scope_id) {
char *p = numaddr + strlen(numaddr);
const char *stringscope = NULL;
#if 0
if ((flags & NI_NUMERICSCOPE) == 0) {
stringscope = foo;
}
#endif
if (stringscope == NULL) {
snprintf(p, sizeof(numaddr) - (p - numaddr),
"%%%u",
((const struct sockaddr_in6 *)sa)->sin6_scope_id);
} else {
snprintf(p, sizeof(numaddr) - (p - numaddr),
"%%%s", stringscope);
}
}
#endif
if (strlen(numaddr) + 1 > hostlen)
ERR(ENI_MEMORY);
strcpy(host, numaddr);
} else {
switch (family) {
case AF_INET:
lwf = LWRES_ADDRTYPE_V4;
break;
case AF_INET6:
lwf = LWRES_ADDRTYPE_V6;
break;
default:
INSIST(0);
}
n = lwres_context_create(&lwrctx, NULL, NULL, NULL, 0);
if (n == 0)
(void) lwres_conf_parse(lwrctx, lwres_resolv_conf);
if (n == 0)
n = lwres_getnamebyaddr(lwrctx, lwf,
(lwres_uint16_t)afd->a_addrlen,
addr, &by);
if (n == 0) {
if (flags & NI_NOFQDN) {
p = strchr(by->realname, '.');
if (p)
*p = '\0';
}
if ((strlen(by->realname) + 1) > hostlen)
ERR(ENI_MEMORY);
strcpy(host, by->realname);
} else {
if (flags & NI_NAMEREQD)
ERR(ENI_NOHOSTNAME);
if (lwres_net_ntop(afd->a_af, addr, numaddr,
sizeof(numaddr))
== NULL)
ERR(ENI_NOHOSTNAME);
if ((strlen(numaddr) + 1) > hostlen)
ERR(ENI_MEMORY);
strcpy(host, numaddr);
}
}
result = SUCCESS;
cleanup:
if (by != NULL)
lwres_gnbaresponse_free(lwrctx, &by);
if (lwrctx != NULL) {
lwres_conf_clear(lwrctx);
lwres_context_destroy(&lwrctx);
}
return (result);
}