static int
addrinfo_from_yp(struct asr_query *as, int family, char *line)
{
char *next, *tokens[MAXTOKEN], *c;
int ntok;
union {
struct sockaddr sa;
struct sockaddr_in sain;
struct sockaddr_in6 sain6;
} u;
for (next = line; line; line = next) {
if ((next = strchr(line, '\n'))) {
*next = '\0';
next += 1;
}
ntok = strsplit(line, tokens, MAXTOKEN);
if (ntok < 2)
continue;
if (asr_sockaddr_from_str(&u.sa, family, tokens[0]) == -1)
continue;
if (as->as.ai.hints.ai_flags & (AI_CANONNAME | AI_FQDN))
c = tokens[1];
else
c = NULL;
if (addrinfo_add(as, &u.sa, c))
return (-1); /* errno set */
}
return (0);
}
static int
addrinfo_from_pkt(struct asr_query *as, char *pkt, size_t pktlen)
{
struct asr_unpack p;
struct asr_dns_header h;
struct asr_dns_query q;
struct asr_dns_rr rr;
int i;
union {
struct sockaddr sa;
struct sockaddr_in sain;
struct sockaddr_in6 sain6;
} u;
char buf[MAXDNAME], *c;
_asr_unpack_init(&p, pkt, pktlen);
_asr_unpack_header(&p, &h);
for (; h.qdcount; h.qdcount--)
_asr_unpack_query(&p, &q);
for (i = 0; i < h.ancount; i++) {
_asr_unpack_rr(&p, &rr);
if (rr.rr_type != q.q_type ||
rr.rr_class != q.q_class)
continue;
memset(&u, 0, sizeof u);
if (rr.rr_type == T_A) {
#ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN
u.sain.sin_len = sizeof u.sain;
#endif
u.sain.sin_family = AF_INET;
u.sain.sin_addr = rr.rr.in_a.addr;
u.sain.sin_port = 0;
} else if (rr.rr_type == T_AAAA) {
#ifdef HAVE_STRUCT_SOCKADDR_IN6_SIN6_LEN
u.sain6.sin6_len = sizeof u.sain6;
#endif
u.sain6.sin6_family = AF_INET6;
u.sain6.sin6_addr = rr.rr.in_aaaa.addr6;
u.sain6.sin6_port = 0;
} else
continue;
if (as->as.ai.hints.ai_flags & AI_CANONNAME) {
_asr_strdname(rr.rr_dname, buf, sizeof buf);
buf[strlen(buf) - 1] = '\0';
c = res_hnok(buf) ? buf : NULL;
} else if (as->as.ai.hints.ai_flags & AI_FQDN)
c = as->as.ai.fqdn;
else
c = NULL;
if (addrinfo_add(as, &u.sa, c))
return (-1); /* errno set */
}
return (0);
}
static int
addrinfo_from_file(struct asr_query *as, int family, FILE *f)
{
char *tokens[MAXTOKEN], *c, buf[BUFSIZ + 1];
int n, i;
union {
struct sockaddr sa;
struct sockaddr_in sain;
struct sockaddr_in6 sain6;
} u;
for (;;) {
n = asr_parse_namedb_line(f, tokens, MAXTOKEN, buf, sizeof(buf));
if (n == -1)
break; /* ignore errors reading the file */
for (i = 1; i < n; i++) {
if (strcasecmp(as->as.ai.hostname, tokens[i]))
continue;
if (asr_sockaddr_from_str(&u.sa, family, tokens[0]) == -1)
continue;
break;
}
if (i == n)
continue;
if (as->as.ai.hints.ai_flags & (AI_CANONNAME | AI_FQDN))
c = tokens[1];
else
c = NULL;
if (addrinfo_add(as, &u.sa, c))
return (-1); /* errno set */
}
return (0);
}
static int
getaddrinfo_async_run(struct asr_query *as, struct asr_result *ar)
{
#ifdef YP
static char *domain = NULL;
char *res;
int len;
char *name;
#endif
char fqdn[MAXDNAME];
const char *str;
struct addrinfo *ai;
int i, family, r;
FILE *f;
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;
if (as->as.ai.hostname == NULL &&
as->as.ai.servname == NULL) {
ar->ar_gai_errno = EAI_NONAME;
async_set_state(as, ASR_STATE_HALT);
break;
}
if (as->as.ai.hostname && as->as.ai.hostname[0] == '\0') {
ar->ar_gai_errno = EAI_NODATA;
async_set_state(as, ASR_STATE_HALT);
break;
}
ai = &as->as.ai.hints;
if (ai->ai_addrlen ||
ai->ai_canonname ||
ai->ai_addr ||
ai->ai_next) {
ar->ar_gai_errno = EAI_BADHINTS;
async_set_state(as, ASR_STATE_HALT);
break;
}
if (ai->ai_flags & ~AI_MASK ||
(ai->ai_flags & AI_CANONNAME && ai->ai_flags & AI_FQDN)) {
ar->ar_gai_errno = EAI_BADFLAGS;
async_set_state(as, ASR_STATE_HALT);
break;
}
if (ai->ai_family != PF_UNSPEC &&
ai->ai_family != PF_INET &&
ai->ai_family != PF_INET6) {
ar->ar_gai_errno = EAI_FAMILY;
async_set_state(as, ASR_STATE_HALT);
break;
}
if (ai->ai_socktype &&
ai->ai_socktype != SOCK_DGRAM &&
ai->ai_socktype != SOCK_STREAM &&
ai->ai_socktype != SOCK_RAW) {
ar->ar_gai_errno = EAI_SOCKTYPE;
async_set_state(as, ASR_STATE_HALT);
break;
}
if (ai->ai_socktype == SOCK_RAW &&
get_port(as->as.ai.servname, NULL, 1) != 0) {
ar->ar_gai_errno = EAI_SERVICE;
async_set_state(as, ASR_STATE_HALT);
break;
}
/* Restrict result set to configured address families */
if (ai->ai_flags & AI_ADDRCONFIG) {
if (addrconfig_setup(as) != 0) {
ar->ar_gai_errno = EAI_FAIL;
async_set_state(as, ASR_STATE_HALT);
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_gai_errno = EAI_BADHINTS;
async_set_state(as, ASR_STATE_HALT);
break;
}
if (ai->ai_protocol == 0 || ai->ai_protocol == IPPROTO_UDP)
as->as.ai.port_udp = get_port(as->as.ai.servname, "udp",
as->as.ai.hints.ai_flags & AI_NUMERICSERV);
if (ai->ai_protocol == 0 || ai->ai_protocol == IPPROTO_TCP)
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 == -2 || as->as.ai.port_udp == -2 ||
(as->as.ai.port_tcp == -1 && as->as.ai.port_udp == -1) ||
(ai->ai_protocol && (as->as.ai.port_udp == -1 ||
as->as.ai.port_tcp == -1))) {
ar->ar_gai_errno = EAI_SERVICE;
async_set_state(as, ASR_STATE_HALT);
break;
}
ar->ar_gai_errno = 0;
/* 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 */
asr_sockaddr_from_str(&sa.sa, family, str);
if ((r = addrinfo_add(as, &sa.sa, NULL))) {
ar->ar_gai_errno = r;
break;
}
}
if (ar->ar_gai_errno == 0 && as->as_count == 0) {
ar->ar_gai_errno = EAI_NODATA;
}
async_set_state(as, ASR_STATE_HALT);
break;
}
/* Try numeric addresses first */
for (family = iter_family(as, 1);
family != -1;
family = iter_family(as, 0)) {
if (asr_sockaddr_from_str(&sa.sa, family,
as->as.ai.hostname) == -1)
continue;
if ((r = addrinfo_add(as, &sa.sa, NULL)))
ar->ar_gai_errno = r;
break;
}
if (ar->ar_gai_errno || as->as_count) {
async_set_state(as, ASR_STATE_HALT);
break;
}
if (ai->ai_flags & AI_NUMERICHOST) {
ar->ar_gai_errno = EAI_NONAME;
async_set_state(as, ASR_STATE_HALT);
break;
}
async_set_state(as, ASR_STATE_NEXT_DB);
break;
case ASR_STATE_NEXT_DB:
if (asr_iter_db(as) == -1) {
async_set_state(as, ASR_STATE_NOT_FOUND);
break;
}
as->as_family_idx = 0;
async_set_state(as, ASR_STATE_SAME_DB);
break;
case ASR_STATE_NEXT_FAMILY:
as->as_family_idx += 1;
if (as->as.ai.hints.ai_family != AF_UNSPEC ||
AS_FAMILY(as) == -1) {
/* The family was specified, or we have tried all
* families with this DB.
*/
if (as->as_count) {
ar->ar_gai_errno = 0;
async_set_state(as, ASR_STATE_HALT);
} else
async_set_state(as, ASR_STATE_NEXT_DOMAIN);
break;
}
async_set_state(as, ASR_STATE_SAME_DB);
break;
case ASR_STATE_NEXT_DOMAIN:
/* domain search is only for dns */
if (AS_DB(as) != ASR_DB_DNS) {
async_set_state(as, ASR_STATE_NEXT_DB);
break;
}
as->as_family_idx = 0;
free(as->as.ai.fqdn);
as->as.ai.fqdn = NULL;
r = iter_domain(as, as->as.ai.hostname, fqdn, sizeof(fqdn));
if (r == -1) {
async_set_state(as, ASR_STATE_NEXT_DB);
break;
}
if (r == 0) {
ar->ar_gai_errno = EAI_FAIL;
async_set_state(as, ASR_STATE_HALT);
break;
}
as->as.ai.fqdn = strdup(fqdn);
if (as->as.ai.fqdn == NULL) {
ar->ar_gai_errno = EAI_MEMORY;
async_set_state(as, ASR_STATE_HALT);
}
async_set_state(as, ASR_STATE_SAME_DB);
break;
case ASR_STATE_SAME_DB:
/* query the current DB again */
switch (AS_DB(as)) {
case ASR_DB_DNS:
if (as->as.ai.fqdn == NULL) {
/* First try, initialize domain iteration */
as->as_dom_flags = 0;
as->as_dom_step = DOM_INIT;
async_set_state(as, ASR_STATE_NEXT_DOMAIN);
break;
}
family = (as->as.ai.hints.ai_family == AF_UNSPEC) ?
AS_FAMILY(as) : as->as.ai.hints.ai_family;
if (family == AF_INET &&
as->as.ai.flags & ASYNC_NO_INET) {
async_set_state(as, ASR_STATE_NEXT_FAMILY);
break;
} else if (family == AF_INET6 &&
as->as.ai.flags & ASYNC_NO_INET6) {
async_set_state(as, ASR_STATE_NEXT_FAMILY);
break;
}
as->as.ai.subq = res_query_async_ctx(as->as.ai.fqdn,
C_IN, (family == AF_INET6) ? T_AAAA : T_A,
as->as_ctx);
if (as->as.ai.subq == NULL) {
if (errno == ENOMEM)
ar->ar_gai_errno = EAI_MEMORY;
else
ar->ar_gai_errno = EAI_FAIL;
async_set_state(as, ASR_STATE_HALT);
break;
}
async_set_state(as, ASR_STATE_SUBQUERY);
break;
case ASR_DB_FILE:
f = fopen(_PATH_HOSTS, "re");
if (f == NULL) {
async_set_state(as, ASR_STATE_NEXT_DB);
break;
}
family = (as->as.ai.hints.ai_family == AF_UNSPEC) ?
AS_FAMILY(as) : as->as.ai.hints.ai_family;
r = addrinfo_from_file(as, family, f);
if (r == -1) {
if (errno == ENOMEM)
ar->ar_gai_errno = EAI_MEMORY;
else
ar->ar_gai_errno = EAI_FAIL;
async_set_state(as, ASR_STATE_HALT);
} else
async_set_state(as, ASR_STATE_NEXT_FAMILY);
fclose(f);
break;
#ifdef YP
case ASR_DB_YP:
if (!domain && _yp_check(&domain) == 0) {
async_set_state(as, ASR_STATE_NEXT_DB);
break;
}
family = (as->as.ai.hints.ai_family == AF_UNSPEC) ?
AS_FAMILY(as) : as->as.ai.hints.ai_family;
name = as->as.ai.hostname;
/* XXX
* ipnodes.byname could also contain IPv4 address
*/
r = yp_match(domain, (family == AF_INET6) ?
"ipnodes.byname" : "hosts.byname",
name, strlen(name), &res, &len);
if (r == 0) {
r = addrinfo_from_yp(as, family, res);
free(res);
if (r == -1) {
if (errno == ENOMEM)
ar->ar_gai_errno = EAI_MEMORY;
else
ar->ar_gai_errno = EAI_FAIL;
async_set_state(as, ASR_STATE_HALT);
break;
}
}
async_set_state(as, ASR_STATE_NEXT_FAMILY);
break;
#endif
default:
async_set_state(as, ASR_STATE_NEXT_DB);
}
break;
case ASR_STATE_SUBQUERY:
if ((r = asr_run(as->as.ai.subq, ar)) == ASYNC_COND)
return (ASYNC_COND);
as->as.ai.subq = NULL;
if (ar->ar_datalen == -1) {
async_set_state(as, ASR_STATE_NEXT_FAMILY);
break;
}
r = addrinfo_from_pkt(as, ar->ar_data, ar->ar_datalen);
if (r == -1) {
if (errno == ENOMEM)
ar->ar_gai_errno = EAI_MEMORY;
else
ar->ar_gai_errno = EAI_FAIL;
async_set_state(as, ASR_STATE_HALT);
} else
async_set_state(as, ASR_STATE_NEXT_FAMILY);
free(ar->ar_data);
break;
case ASR_STATE_NOT_FOUND:
/* No result found. Maybe we can try again. */
if (as->as.ai.flags & ASYNC_AGAIN)
ar->ar_gai_errno = EAI_AGAIN;
else
ar->ar_gai_errno = EAI_NODATA;
async_set_state(as, ASR_STATE_HALT);
break;
case ASR_STATE_HALT:
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_gai_errno = EAI_SYSTEM;
async_set_state(as, ASR_STATE_HALT);
break;
}
goto next;
}