/*
* Resolve the entry in servers with index ind, adding connections to the list
* *conns. Connections are added for each of socktype1 and (if not zero)
* socktype2. message and udpbufp are used to initialize the connections; see
* add_connection above. If no addresses are available for an entry but no
* internal name resolution failure occurs, return 0 without adding any new
* connections.
*/
static krb5_error_code
resolve_server(krb5_context context, const struct serverlist *servers,
size_t ind, int socktype1, int socktype2,
const krb5_data *message, char **udpbufp,
struct conn_state **conns)
{
krb5_error_code retval;
struct server_entry *entry = &servers->servers[ind];
struct addrinfo *addrs, *a, hint, ai;
int err, result;
char portbuf[64];
/* Skip any stray entries of socktypes we don't want. */
if (entry->socktype != 0 && entry->socktype != socktype1 &&
entry->socktype != socktype2)
return 0;
if (entry->hostname == NULL) {
ai.ai_socktype = entry->socktype;
ai.ai_family = entry->family;
ai.ai_addrlen = entry->addrlen;
ai.ai_addr = (struct sockaddr *)&entry->addr;
return add_connection(conns, &ai, ind, message, udpbufp);
}
memset(&hint, 0, sizeof(hint));
hint.ai_family = entry->family;
hint.ai_socktype = (entry->socktype != 0) ? entry->socktype : socktype1;
#ifdef AI_NUMERICSERV
hint.ai_flags = AI_NUMERICSERV;
#endif
result = snprintf(portbuf, sizeof(portbuf), "%d", ntohs(entry->port));
if (SNPRINTF_OVERFLOW(result, sizeof(portbuf)))
return EINVAL;
TRACE_SENDTO_KDC_RESOLVING(context, entry->hostname);
err = getaddrinfo(entry->hostname, portbuf, &hint, &addrs);
if (err)
return translate_ai_error(err);
/* Add each address with the preferred socktype. */
retval = 0;
for (a = addrs; a != 0 && retval == 0; a = a->ai_next)
retval = add_connection(conns, a, ind, message, udpbufp);
if (retval == 0 && entry->socktype == 0 && socktype2 != 0) {
/* Add each address again with the non-preferred socktype. */
for (a = addrs; a != 0 && retval == 0; a = a->ai_next) {
a->ai_socktype = socktype2;
retval = add_connection(conns, a, ind, message, udpbufp);
}
}
freeaddrinfo(addrs);
return retval;
}
/*
* Resolve the entry in servers with index ind, adding connections to the list
* *conns. Connections are added for each of socktype1 and (if not zero)
* socktype2. message and udpbufp are used to initialize the connections; see
* add_connection above. If no addresses are available for an entry but no
* internal name resolution failure occurs, return 0 without adding any new
* connections.
*/
static krb5_error_code
resolve_server(krb5_context context, const krb5_data *realm,
const struct serverlist *servers, size_t ind,
k5_transport_strategy strategy, const krb5_data *message,
char **udpbufp, struct conn_state **conns)
{
krb5_error_code retval;
struct server_entry *entry = &servers->servers[ind];
k5_transport transport;
struct addrinfo *addrs, *a, hint, ai;
krb5_boolean defer;
int err, result;
char portbuf[64];
/* Skip UDP entries if we don't want UDP. */
if (strategy == NO_UDP && entry->transport == UDP)
return 0;
transport = (strategy == UDP_FIRST) ? UDP : TCP;
if (entry->hostname == NULL) {
/* Added by a module, so transport is either TCP or UDP. */
ai.ai_socktype = socktype_for_transport(entry->transport);
ai.ai_family = entry->family;
ai.ai_addrlen = entry->addrlen;
ai.ai_addr = (struct sockaddr *)&entry->addr;
defer = (entry->transport != transport);
return add_connection(conns, entry->transport, defer, &ai, ind, realm,
NULL, entry->uri_path, udpbufp);
}
/* If the entry has a specified transport, use it. */
if (entry->transport != TCP_OR_UDP)
transport = entry->transport;
memset(&hint, 0, sizeof(hint));
hint.ai_family = entry->family;
hint.ai_socktype = socktype_for_transport(transport);
hint.ai_flags = AI_ADDRCONFIG;
#ifdef AI_NUMERICSERV
hint.ai_flags |= AI_NUMERICSERV;
#endif
result = snprintf(portbuf, sizeof(portbuf), "%d", ntohs(entry->port));
if (SNPRINTF_OVERFLOW(result, sizeof(portbuf)))
return EINVAL;
TRACE_SENDTO_KDC_RESOLVING(context, entry->hostname);
err = getaddrinfo(entry->hostname, portbuf, &hint, &addrs);
if (err)
return translate_ai_error(err);
/* Add each address with the specified or preferred transport. */
retval = 0;
for (a = addrs; a != 0 && retval == 0; a = a->ai_next) {
retval = add_connection(conns, transport, FALSE, a, ind, realm,
entry->hostname, entry->uri_path, udpbufp);
}
/* For TCP_OR_UDP entries, add each address again with the non-preferred
* transport, unless we are avoiding UDP. Flag these as deferred. */
if (retval == 0 && entry->transport == TCP_OR_UDP && strategy != NO_UDP) {
transport = (strategy == UDP_FIRST) ? TCP : UDP;
for (a = addrs; a != 0 && retval == 0; a = a->ai_next) {
a->ai_socktype = socktype_for_transport(transport);
retval = add_connection(conns, transport, TRUE, a, ind, realm,
entry->hostname, entry->uri_path, udpbufp);
}
}
freeaddrinfo(addrs);
return retval;
}
