static int
gethostnamadr_async_run(struct async *as, struct async_res *ar)
{
int r, type;
FILE *f;
char dname[MAXDNAME], *data;
next:
switch(as->as_state) {
case ASR_STATE_INIT:
if (as->as.hostnamadr.family != AF_INET &&
as->as.hostnamadr.family != AF_INET6) {
ar->ar_h_errno = NETDB_INTERNAL;
ar->ar_errno = EAFNOSUPPORT;
async_set_state(as, ASR_STATE_HALT);
break;
}
if ((as->as.hostnamadr.family == AF_INET &&
as->as.hostnamadr.addrlen != INADDRSZ) ||
(as->as.hostnamadr.family == AF_INET6 &&
as->as.hostnamadr.addrlen != IN6ADDRSZ)) {
ar->ar_h_errno = NETDB_INTERNAL;
ar->ar_errno = EINVAL;
async_set_state(as, ASR_STATE_HALT);
break;
}
if (as->as_type == ASR_GETHOSTBYNAME)
async_set_state(as, ASR_STATE_NEXT_DOMAIN);
else
async_set_state(as, ASR_STATE_NEXT_DB);
break;
case ASR_STATE_NEXT_DOMAIN:
r = asr_iter_domain(as, as->as.hostnamadr.name, dname, sizeof(dname));
if (r == -1) {
async_set_state(as, ASR_STATE_NOT_FOUND);
break;
}
if (as->as.hostnamadr.dname)
free(as->as.hostnamadr.dname);
if ((as->as.hostnamadr.dname = strdup(dname)) == NULL) {
ar->ar_h_errno = NETDB_INTERNAL;
ar->ar_errno = errno;
async_set_state(as, ASR_STATE_HALT);
}
as->as_db_idx = 0;
async_set_state(as, ASR_STATE_NEXT_DB);
break;
case ASR_STATE_NEXT_DB:
if (asr_iter_db(as) == -1) {
if (as->as_type == ASR_GETHOSTBYNAME)
async_set_state(as, ASR_STATE_NEXT_DOMAIN);
else
async_set_state(as, ASR_STATE_NOT_FOUND);
break;
}
switch(AS_DB(as)) {
case ASR_DB_DNS:
/* Create a subquery to do the DNS lookup */
if (as->as_type == ASR_GETHOSTBYNAME) {
type = (as->as.hostnamadr.family == AF_INET) ?
T_A : T_AAAA;
as->as.hostnamadr.subq = res_query_async_ctx(
as->as.hostnamadr.dname,
C_IN, type, NULL, 0, as->as_ctx);
} else {
addr_as_fqdn(as->as.hostnamadr.addr,
as->as.hostnamadr.family,
dname, sizeof(dname));
as->as.hostnamadr.subq = res_query_async_ctx(
dname, C_IN, T_PTR, NULL, 0, as->as_ctx);
}
if (as->as.hostnamadr.subq == NULL) {
ar->ar_errno = errno;
ar->ar_h_errno = NETDB_INTERNAL;
async_set_state(as, ASR_STATE_HALT);
break;
}
async_set_state(as, ASR_STATE_SUBQUERY);
break;
case ASR_DB_FILE:
/* Try to find a match in the host file */
if ((f = fopen(as->as_ctx->ac_hostfile, "r")) == NULL)
break;
if (as->as_type == ASR_GETHOSTBYNAME)
data = as->as.hostnamadr.dname;
else
data = as->as.hostnamadr.addr;
ar->ar_hostent = hostent_file_match(f, as->as_type,
as->as.hostnamadr.family, data,
as->as.hostnamadr.addrlen);
fclose(f);
if (ar->ar_hostent == NULL) {
if (errno) {
ar->ar_errno = errno;
ar->ar_h_errno = NETDB_INTERNAL;
async_set_state(as, ASR_STATE_HALT);
}
/* otherwise not found */
break;
}
ar->ar_h_errno = NETDB_SUCCESS;
async_set_state(as, ASR_STATE_HALT);
break;
#ifdef YP
case ASR_DB_YP:
/* IPv4 only */
if (as->as.hostnamadr.family != AF_INET)
break;
if (as->as_type == ASR_GETHOSTBYNAME)
data = as->as.hostnamadr.dname;
else
data = as->as.hostnamadr.addr;
ar->ar_hostent = _yp_gethostnamadr(as->as_type, data);
if (ar->ar_hostent == NULL) {
if (errno) {
ar->ar_errno = errno;
ar->ar_h_errno = NETDB_INTERNAL;
async_set_state(as, ASR_STATE_HALT);
}
/* otherwise not found */
break;
}
ar->ar_h_errno = NETDB_SUCCESS;
async_set_state(as, ASR_STATE_HALT);
break;
#endif
}
break;
case ASR_STATE_SUBQUERY:
/* Run the DNS subquery. */
if ((r = async_run(as->as.hostnamadr.subq, ar)) == ASYNC_COND)
return (ASYNC_COND);
/* Done. */
as->as.hostnamadr.subq = NULL;
if (ar->ar_datalen == -1) {
async_set_state(as, ASR_STATE_NEXT_DB);
break;
}
/* If we got a packet but no anwser, use the next DB. */
if (ar->ar_count == 0) {
free(ar->ar_data);
async_set_state(as, ASR_STATE_NEXT_DB);
break;
}
/* Read the hostent from the packet. */
ar->ar_hostent = hostent_from_packet(as->as_type,
as->as.hostnamadr.family, ar->ar_data, ar->ar_datalen);
free(ar->ar_data);
if (ar->ar_hostent == NULL) {
ar->ar_errno = errno;
ar->ar_h_errno = NETDB_INTERNAL;
async_set_state(as, ASR_STATE_HALT);
break;
}
if (as->as_type == ASR_GETHOSTBYADDR) {
if (hostent_add_addr(ar->ar_hostent,
as->as.hostnamadr.addr,
as->as.hostnamadr.addrlen) == -1) {
free(ar->ar_hostent);
ar->ar_errno = errno;
ar->ar_h_errno = NETDB_INTERNAL;
async_set_state(as, ASR_STATE_HALT);
break;
}
}
/*
* No address found in the dns packet. The blocking version
* reports this as an error.
*/
if (as->as_type == ASR_GETHOSTBYNAME &&
ar->ar_hostent->h_addr_list[0] == NULL) {
free(ar->ar_hostent);
async_set_state(as, ASR_STATE_NEXT_DB);
break;
}
ar->ar_h_errno = NETDB_SUCCESS;
async_set_state(as, ASR_STATE_HALT);
break;
case ASR_STATE_NOT_FOUND:
ar->ar_errno = 0;
ar->ar_h_errno = HOST_NOT_FOUND;
async_set_state(as, ASR_STATE_HALT);
break;
case ASR_STATE_HALT:
if (ar->ar_h_errno)
ar->ar_hostent = NULL;
else
ar->ar_errno = 0;
return (ASYNC_DONE);
default:
ar->ar_errno = EOPNOTSUPP;
ar->ar_h_errno = NETDB_INTERNAL;
ar->ar_gai_errno = EAI_SYSTEM;
async_set_state(as, ASR_STATE_HALT);
break;
}
goto next;
}
static int
getaddrinfo_async_run(struct async *as, struct async_res *ar)
{
const char *str;
struct addrinfo *ai;
int i, family, r;
char fqdn[MAXDNAME];
union {
struct sockaddr sa;
struct sockaddr_in sain;
struct sockaddr_in6 sain6;
} sa;
next:
switch(as->as_state) {
case ASR_STATE_INIT:
/*
* First, make sure the parameters are valid.
*/
as->as_count = 0;
async_set_state(as, ASR_STATE_HALT);
ar->ar_errno = 0;
ar->ar_h_errno = NETDB_SUCCESS;
ar->ar_gai_errno = 0;
if (as->as.ai.hostname == NULL &&
as->as.ai.servname == NULL) {
ar->ar_h_errno = NO_RECOVERY;
ar->ar_gai_errno = EAI_NONAME;
break;
}
ai = &as->as.ai.hints;
if (ai->ai_addrlen ||
ai->ai_canonname ||
ai->ai_addr ||
ai->ai_next) {
ar->ar_h_errno = NO_RECOVERY;
ar->ar_gai_errno = EAI_BADHINTS;
break;
}
if (ai->ai_flags & ~AI_MASK ||
(ai->ai_flags & AI_CANONNAME && ai->ai_flags & AI_FQDN)) {
ar->ar_h_errno = NO_RECOVERY;
ar->ar_gai_errno = EAI_BADFLAGS;
break;
}
if (ai->ai_family != PF_UNSPEC &&
ai->ai_family != PF_INET &&
ai->ai_family != PF_INET6) {
ar->ar_h_errno = NO_RECOVERY;
ar->ar_gai_errno = EAI_FAMILY;
break;
}
if (ai->ai_socktype &&
ai->ai_socktype != SOCK_DGRAM &&
ai->ai_socktype != SOCK_STREAM &&
ai->ai_socktype != SOCK_RAW) {
ar->ar_h_errno = NO_RECOVERY;
ar->ar_gai_errno = EAI_SOCKTYPE;
break;
}
if (ai->ai_protocol &&
ai->ai_protocol != IPPROTO_UDP &&
ai->ai_protocol != IPPROTO_TCP) {
ar->ar_h_errno = NO_RECOVERY;
ar->ar_gai_errno = EAI_PROTOCOL;
break;
}
if (ai->ai_socktype == SOCK_RAW &&
as->as.ai.servname != NULL) {
ar->ar_h_errno = NO_RECOVERY;
ar->ar_gai_errno = EAI_SERVICE;
break;
}
/* Make sure there is at least a valid combination */
for (i = 0; matches[i].family != -1; i++)
if (MATCH_FAMILY(ai->ai_family, i) &&
MATCH_SOCKTYPE(ai->ai_socktype, i) &&
MATCH_PROTO(ai->ai_protocol, i))
break;
if (matches[i].family == -1) {
ar->ar_h_errno = NO_RECOVERY;
ar->ar_gai_errno = EAI_BADHINTS;
break;
}
if (as->as.ai.servname) {
as->as.ai.port_udp = get_port(as->as.ai.servname,
"udp", as->as.ai.hints.ai_flags & AI_NUMERICSERV);
as->as.ai.port_tcp = get_port(as->as.ai.servname,
"tcp", as->as.ai.hints.ai_flags & AI_NUMERICSERV);
if (as->as.ai.port_tcp < 0 || as->as.ai.port_udp < 0) {
ar->ar_h_errno = NO_RECOVERY;
ar->ar_gai_errno = EAI_SERVICE;
break;
}
}
/* If hostname is NULL, use local address */
if (as->as.ai.hostname == NULL) {
for(family = iter_family(as, 1);
family != -1;
family = iter_family(as, 0)) {
/*
* We could use statically built sockaddrs for
* those, rather than parsing over and over.
*/
if (family == PF_INET)
str = (ai->ai_flags & AI_PASSIVE) ? \
"0.0.0.0" : "127.0.0.1";
else /* PF_INET6 */
str = (ai->ai_flags & AI_PASSIVE) ? \
"::" : "::1";
/* This can't fail */
sockaddr_from_str(&sa.sa, family, str);
if ((r = add_sockaddr(as, &sa.sa, NULL))) {
ar->ar_errno = errno;
ar->ar_h_errno = NETDB_INTERNAL;
ar->ar_gai_errno = r;
async_set_state(as, ASR_STATE_HALT);
break;
}
}
if (ar->ar_gai_errno == 0 && as->as_count == 0) {
ar->ar_h_errno = NO_DATA;
ar->ar_gai_errno = EAI_NODATA;
}
break;
}
/* Try numeric addresses first */
for(family = iter_family(as, 1);
family != -1;
family = iter_family(as, 0)) {
if (sockaddr_from_str(&sa.sa, family,
as->as.ai.hostname) == -1)
continue;
if ((r = add_sockaddr(as, &sa.sa, NULL))) {
ar->ar_errno = errno;
ar->ar_h_errno = NETDB_INTERNAL;
ar->ar_gai_errno = r;
async_set_state(as, ASR_STATE_HALT);
break;
}
async_set_state(as, ASR_STATE_HALT);
break;
}
if (ar->ar_gai_errno || as->as_count)
break;
if (ai->ai_flags & AI_NUMERICHOST) {
ar->ar_h_errno = NO_RECOVERY;
ar->ar_gai_errno = EAI_FAIL;
async_set_state(as, ASR_STATE_HALT);
break;
}
/* Starting domain lookup */
async_set_state(as, ASR_STATE_SEARCH_DOMAIN);
break;
case ASR_STATE_SEARCH_DOMAIN:
r = asr_iter_domain(as, as->as.ai.hostname, fqdn, sizeof(fqdn));
if (r == -1) {
async_set_state(as, ASR_STATE_NOT_FOUND);
break;
}
if (r > (int)sizeof(fqdn)) {
ar->ar_errno = EINVAL;
ar->ar_h_errno = NO_RECOVERY;
ar->ar_gai_errno = EAI_OVERFLOW;
async_set_state(as, ASR_STATE_HALT);
break;
}
/*
* Create a subquery to lookup the host addresses.
* We use the special hostaddr_async() API, which has the
* nice property of honoring the "lookup" and "family" keyword
* in the configuration, thus returning the right address
* families in the right order, and thus fixing the current
* getaddrinfo() feature documented in the BUGS section of
* resolver.conf(5).
*/
as->as.ai.subq = hostaddr_async_ctx(fqdn,
as->as.ai.hints.ai_family, as->as.ai.hints.ai_flags,
as->as_ctx);
if (as->as.ai.subq == NULL) {
ar->ar_errno = errno;
if (errno == EINVAL) {
ar->ar_h_errno = NO_RECOVERY;
ar->ar_gai_errno = EAI_FAIL;
} else {
ar->ar_h_errno = NETDB_INTERNAL;
ar->ar_gai_errno = EAI_MEMORY;
}
async_set_state(as, ASR_STATE_HALT);
break;
}
async_set_state(as, ASR_STATE_LOOKUP_DOMAIN);
break;
case ASR_STATE_LOOKUP_DOMAIN:
/* Run the subquery */
if ((r = async_run(as->as.ai.subq, ar)) == ASYNC_COND)
return (ASYNC_COND);
/* Got one more address, use it to extend the result list. */
if (r == ASYNC_YIELD) {
if ((r = add_sockaddr(as, &ar->ar_sa.sa,
ar->ar_cname))) {
ar->ar_errno = errno;
ar->ar_h_errno = NETDB_INTERNAL;
ar->ar_gai_errno = r;
async_set_state(as, ASR_STATE_HALT);
}
if (ar->ar_cname)
free(ar->ar_cname);
break;
}
/*
* The subquery is done. Stop there if we have at least one
* answer.
*/
as->as.ai.subq = NULL;
if (ar->ar_count) {
async_set_state(as, ASR_STATE_HALT);
break;
}
/*
* No anwser for this domain, but we might be suggested to
* try again later, so remember this. Then search the next
* domain.
*/
if (ar->ar_gai_errno == EAI_AGAIN)
as->as.ai.flags |= ASYNC_AGAIN;
async_set_state(as, ASR_STATE_SEARCH_DOMAIN);
break;
case ASR_STATE_NOT_FOUND:
/*
* No result found. Maybe we can try again.
*/
ar->ar_errno = 0;
if (as->as.ai.flags & ASYNC_AGAIN) {
ar->ar_h_errno = TRY_AGAIN;
ar->ar_gai_errno = EAI_AGAIN;
} else {
ar->ar_h_errno = NO_DATA;
ar->ar_gai_errno = EAI_NODATA;
}
async_set_state(as, ASR_STATE_HALT);
break;
case ASR_STATE_HALT:
/* Set the results. */
if (ar->ar_gai_errno == 0) {
ar->ar_count = as->as_count;
ar->ar_addrinfo = as->as.ai.aifirst;
as->as.ai.aifirst = NULL;
} else {
ar->ar_count = 0;
ar->ar_addrinfo = NULL;
}
return (ASYNC_DONE);
default:
ar->ar_errno = EOPNOTSUPP;
ar->ar_h_errno = NETDB_INTERNAL;
ar->ar_gai_errno = EAI_SYSTEM;
async_set_state(as, ASR_STATE_HALT);
break;
}
goto next;
}