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freeswitch/libs/ldns/net.c

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/*
* net.c
*
* Network implementation
* All network related functions are grouped here
*
* a Net::DNS like library for C
*
* (c) NLnet Labs, 2004-2006
*
* See the file LICENSE for the license
*/
#include <ldns/config.h>
#include <ldns/ldns.h>
#ifdef HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#ifdef HAVE_NETDB_H
#include <netdb.h>
#endif
#ifdef HAVE_ARPA_INET_H
#include <arpa/inet.h>
#endif
#ifdef _MSC_VER
#include <compat/gettimeofday.h>
#include <time.h>
#else
#include <sys/time.h>
#endif
#include <errno.h>
#include <fcntl.h>
ldns_status
ldns_send(ldns_pkt **result_packet, ldns_resolver *r, const ldns_pkt *query_pkt)
{
ldns_buffer *qb;
ldns_status result;
ldns_rdf *tsig_mac = NULL;
qb = ldns_buffer_new(LDNS_MIN_BUFLEN);
if (query_pkt && ldns_pkt_tsig(query_pkt)) {
tsig_mac = ldns_rr_rdf(ldns_pkt_tsig(query_pkt), 3);
}
if (!query_pkt ||
ldns_pkt2buffer_wire(qb, query_pkt) != LDNS_STATUS_OK) {
result = LDNS_STATUS_ERR;
} else {
result = ldns_send_buffer(result_packet, r, qb, tsig_mac);
}
ldns_buffer_free(qb);
return result;
}
ldns_status
ldns_send_buffer(ldns_pkt **result, ldns_resolver *r, ldns_buffer *qb, ldns_rdf *tsig_mac)
{
uint8_t i;
struct sockaddr_storage *ns;
size_t ns_len;
struct timeval tv_s;
struct timeval tv_e;
ldns_rdf **ns_array;
size_t *rtt;
ldns_pkt *reply;
bool all_servers_rtt_inf;
uint8_t retries;
uint8_t *reply_bytes = NULL;
size_t reply_size = 0;
ldns_status status, send_status;
assert(r != NULL);
status = LDNS_STATUS_OK;
rtt = ldns_resolver_rtt(r);
ns_array = ldns_resolver_nameservers(r);
reply = NULL;
ns_len = 0;
all_servers_rtt_inf = true;
if (ldns_resolver_random(r)) {
ldns_resolver_nameservers_randomize(r);
}
/* loop through all defined nameservers */
for (i = 0; i < ldns_resolver_nameserver_count(r); i++) {
if (rtt[i] == LDNS_RESOLV_RTT_INF) {
/* not reachable nameserver! */
continue;
}
/* maybe verbosity setting?
printf("Sending to ");
ldns_rdf_print(stdout, ns_array[i]);
printf("\n");
*/
ns = ldns_rdf2native_sockaddr_storage(ns_array[i],
ldns_resolver_port(r), &ns_len);
if ((ns->ss_family == AF_INET) &&
(ldns_resolver_ip6(r) == LDNS_RESOLV_INET6)) {
/* not reachable */
continue;
}
if ((ns->ss_family == AF_INET6) &&
(ldns_resolver_ip6(r) == LDNS_RESOLV_INET)) {
/* not reachable */
continue;
}
all_servers_rtt_inf = false;
gettimeofday(&tv_s, NULL);
send_status = LDNS_STATUS_ERR;
/* reply_bytes implicitly handles our error */
if (1 == ldns_resolver_usevc(r)) {
for (retries = ldns_resolver_retry(r); retries > 0; retries--) {
send_status =
ldns_tcp_send(&reply_bytes, qb, ns,
(socklen_t)ns_len, ldns_resolver_timeout(r),
&reply_size);
if (send_status == LDNS_STATUS_OK) {
break;
}
}
} else {
for (retries = ldns_resolver_retry(r); retries > 0; retries--) {
/* ldns_rdf_print(stdout, ns_array[i]); */
send_status =
ldns_udp_send(&reply_bytes, qb, ns,
(socklen_t)ns_len, ldns_resolver_timeout(r),
&reply_size);
if (send_status == LDNS_STATUS_OK) {
break;
}
}
}
if (send_status != LDNS_STATUS_OK) {
ldns_resolver_set_nameserver_rtt(r, i, LDNS_RESOLV_RTT_INF);
status = send_status;
}
/* obey the fail directive */
if (!reply_bytes) {
/* the current nameserver seems to have a problem, blacklist it */
if (ldns_resolver_fail(r)) {
LDNS_FREE(ns);
return LDNS_STATUS_ERR;
} else {
LDNS_FREE(ns);
continue;
}
}
status = ldns_wire2pkt(&reply, reply_bytes, reply_size);
if (status != LDNS_STATUS_OK) {
LDNS_FREE(reply_bytes);
LDNS_FREE(ns);
return status;
}
LDNS_FREE(ns);
gettimeofday(&tv_e, NULL);
if (reply) {
ldns_pkt_set_querytime(reply, (uint32_t)
((tv_e.tv_sec - tv_s.tv_sec) * 1000) +
(tv_e.tv_usec - tv_s.tv_usec) / 1000);
ldns_pkt_set_answerfrom(reply, ns_array[i]);
ldns_pkt_set_timestamp(reply, tv_s);
ldns_pkt_set_size(reply, reply_size);
break;
} else {
if (ldns_resolver_fail(r)) {
/* if fail is set bail out, after the first
* one */
break;
}
}
/* wait retrans seconds... */
sleep((unsigned int) ldns_resolver_retrans(r));
}
if (all_servers_rtt_inf) {
LDNS_FREE(reply_bytes);
return LDNS_STATUS_RES_NO_NS;
}
#ifdef HAVE_SSL
if (tsig_mac && reply_bytes) {
if (!ldns_pkt_tsig_verify(reply,
reply_bytes,
reply_size,
ldns_resolver_tsig_keyname(r),
ldns_resolver_tsig_keydata(r), tsig_mac)) {
status = LDNS_STATUS_CRYPTO_TSIG_BOGUS;
}
}
#else
(void)tsig_mac;
#endif /* HAVE_SSL */
LDNS_FREE(reply_bytes);
if (result) {
*result = reply;
}
return status;
}
/** best effort to set nonblocking */
static void
ldns_sock_nonblock(int sockfd)
{
#ifdef HAVE_FCNTL
int flag;
if((flag = fcntl(sockfd, F_GETFL)) != -1) {
flag |= O_NONBLOCK;
if(fcntl(sockfd, F_SETFL, flag) == -1) {
/* ignore error, continue blockingly */
}
}
#elif defined(HAVE_IOCTLSOCKET)
unsigned long on = 1;
if(ioctlsocket(sockfd, FIONBIO, &on) != 0) {
/* ignore error, continue blockingly */
}
#endif
}
/** best effort to set blocking */
static void
ldns_sock_block(int sockfd)
{
#ifdef HAVE_FCNTL
int flag;
if((flag = fcntl(sockfd, F_GETFL)) != -1) {
flag &= ~O_NONBLOCK;
if(fcntl(sockfd, F_SETFL, flag) == -1) {
/* ignore error, continue */
}
}
#elif defined(HAVE_IOCTLSOCKET)
unsigned long off = 0;
if(ioctlsocket(sockfd, FIONBIO, &off) != 0) {
/* ignore error, continue */
}
#endif
}
#ifndef WIN32
#include <poll.h>
#endif
/** wait for a socket to become ready */
static int
ldns_sock_wait(int sockfd, struct timeval timeout, int write)
{
int ret;
#ifdef WIN32
fd_set fds;
#ifndef S_SPLINT_S
FD_ZERO(&fds);
FD_SET(sockfd, &fds);
#endif
if(write)
ret = select(sockfd+1, NULL, &fds, NULL, &timeout);
else
ret = select(sockfd+1, &fds, NULL, NULL, &timeout);
#else
struct pollfd pfds[2];
int x = 0;
memset(&pfds[0], 0, sizeof(pfds[0]) * 2);
pfds[0].fd = sockfd;
pfds[0].events = POLLIN|POLLERR;
if (write) {
pfds[0].events |= POLLOUT;
}
ret = poll(pfds, 1, timeout.tv_sec * 1000 + timeout.tv_usec / 1000);
#endif
if(ret == 0)
/* timeout expired */
return 0;
else if(ret == -1)
/* error */
return 0;
return 1;
}
ldns_status
ldns_udp_send(uint8_t **result, ldns_buffer *qbin, const struct sockaddr_storage *to,
socklen_t tolen, struct timeval timeout, size_t *answer_size)
{
int sockfd;
uint8_t *answer;
sockfd = ldns_udp_bgsend(qbin, to, tolen, timeout);
if (sockfd == 0) {
return LDNS_STATUS_SOCKET_ERROR;
}
/* wait for an response*/
if(!ldns_sock_wait(sockfd, timeout, 0)) {
close_socket(sockfd);
return LDNS_STATUS_NETWORK_ERR;
}
/* set to nonblocking, so if the checksum is bad, it becomes
* an EGAIN error and the ldns_udp_send function does not block,
* but returns a 'NETWORK_ERROR' much like a timeout. */
ldns_sock_nonblock(sockfd);
answer = ldns_udp_read_wire(sockfd, answer_size, NULL, NULL);
close_socket(sockfd);
if (*answer_size == 0) {
/* oops */
return LDNS_STATUS_NETWORK_ERR;
}
*result = answer;
return LDNS_STATUS_OK;
}
int
ldns_udp_bgsend(ldns_buffer *qbin, const struct sockaddr_storage *to, socklen_t tolen,
struct timeval timeout)
{
int sockfd;
sockfd = ldns_udp_connect(to, timeout);
if (sockfd == 0) {
return 0;
}
if (ldns_udp_send_query(qbin, sockfd, to, tolen) == 0) {
return 0;
}
return sockfd;
}
int
ldns_udp_connect(const struct sockaddr_storage *to, struct timeval ATTR_UNUSED(timeout))
{
int sockfd;
if ((sockfd = socket((int)((struct sockaddr*)to)->sa_family, SOCK_DGRAM,
IPPROTO_UDP))
== SOCK_INVALID) {
return 0;
}
return sockfd;
}
int
ldns_tcp_connect(const struct sockaddr_storage *to, socklen_t tolen,
struct timeval timeout)
{
int sockfd;
if ((sockfd = socket((int)((struct sockaddr*)to)->sa_family, SOCK_STREAM,
IPPROTO_TCP)) == SOCK_INVALID) {
return 0;
}
/* perform nonblocking connect, to be able to wait with select() */
ldns_sock_nonblock(sockfd);
if (connect(sockfd, (struct sockaddr*)to, tolen) == SOCK_INVALID) {
#ifndef USE_WINSOCK
#ifdef EINPROGRESS
if(errno != EINPROGRESS) {
#else
if(1) {
#endif
close_socket(sockfd);
return 0;
}
#else /* USE_WINSOCK */
if(WSAGetLastError() != WSAEINPROGRESS &&
WSAGetLastError() != WSAEWOULDBLOCK) {
closesocket(sockfd);
return 0;
}
#endif
/* error was only telling us that it would block */
}
/* wait(write) until connected or error */
while(1) {
int error = 0;
socklen_t len = (socklen_t)sizeof(error);
if(!ldns_sock_wait(sockfd, timeout, 1)) {
close_socket(sockfd);
return 0;
}
/* check if there is a pending error for nonblocking connect */
if(getsockopt(sockfd, SOL_SOCKET, SO_ERROR, (void*)&error,
&len) < 0) {
#ifndef USE_WINSOCK
error = errno; /* on solaris errno is error */
#else
error = WSAGetLastError();
#endif
}
#ifndef USE_WINSOCK
#if defined(EINPROGRESS) && defined(EWOULDBLOCK)
if(error == EINPROGRESS || error == EWOULDBLOCK)
continue; /* try again */
#endif
else if(error != 0) {
close_socket(sockfd);
/* error in errno for our user */
errno = error;
return 0;
}
#else /* USE_WINSOCK */
if(error == WSAEINPROGRESS)
continue;
else if(error == WSAEWOULDBLOCK)
continue;
else if(error != 0) {
closesocket(sockfd);
errno = error;
return 0;
}
#endif /* USE_WINSOCK */
/* connected */
break;
}
/* set the socket blocking again */
ldns_sock_block(sockfd);
return sockfd;
}
ssize_t
ldns_tcp_send_query(ldns_buffer *qbin, int sockfd,
const struct sockaddr_storage *to, socklen_t tolen)
{
uint8_t *sendbuf;
ssize_t bytes;
/* add length of packet */
sendbuf = LDNS_XMALLOC(uint8_t, ldns_buffer_position(qbin) + 2);
if(!sendbuf) return 0;
ldns_write_uint16(sendbuf, ldns_buffer_position(qbin));
memcpy(sendbuf + 2, ldns_buffer_export(qbin), ldns_buffer_position(qbin));
bytes = sendto(sockfd, (void*)sendbuf,
ldns_buffer_position(qbin) + 2, 0, (struct sockaddr *)to, tolen);
LDNS_FREE(sendbuf);
if (bytes == -1 || (size_t) bytes != ldns_buffer_position(qbin) + 2 ) {
return 0;
}
return bytes;
}
/* don't wait for an answer */
ssize_t
ldns_udp_send_query(ldns_buffer *qbin, int sockfd, const struct sockaddr_storage *to,
socklen_t tolen)
{
ssize_t bytes;
bytes = sendto(sockfd, (void*)ldns_buffer_begin(qbin),
ldns_buffer_position(qbin), 0, (struct sockaddr *)to, tolen);
if (bytes == -1 || (size_t)bytes != ldns_buffer_position(qbin)) {
return 0;
}
if ((size_t) bytes != ldns_buffer_position(qbin)) {
return 0;
}
return bytes;
}
uint8_t *
ldns_udp_read_wire(int sockfd, size_t *size, struct sockaddr_storage *from,
socklen_t *fromlen)
{
uint8_t *wire, *wireout;
ssize_t wire_size;
wire = LDNS_XMALLOC(uint8_t, LDNS_MAX_PACKETLEN);
if (!wire) {
*size = 0;
return NULL;
}
wire_size = recvfrom(sockfd, (void*)wire, LDNS_MAX_PACKETLEN, 0,
(struct sockaddr *)from, fromlen);
/* recvfrom can also return 0 */
if (wire_size == -1 || wire_size == 0) {
*size = 0;
LDNS_FREE(wire);
return NULL;
}
*size = (size_t)wire_size;
wireout = LDNS_XREALLOC(wire, uint8_t, (size_t)wire_size);
if(!wireout) LDNS_FREE(wire);
return wireout;
}
uint8_t *
ldns_tcp_read_wire_timeout(int sockfd, size_t *size, struct timeval timeout)
{
uint8_t *wire;
uint16_t wire_size;
ssize_t bytes = 0, rc = 0;
wire = LDNS_XMALLOC(uint8_t, 2);
if (!wire) {
*size = 0;
return NULL;
}
while (bytes < 2) {
if(!ldns_sock_wait(sockfd, timeout, 0)) {
*size = 0;
LDNS_FREE(wire);
return NULL;
}
rc = recv(sockfd, (void*) (wire + bytes),
(size_t) (2 - bytes), 0);
if (rc == -1 || rc == 0) {
*size = 0;
LDNS_FREE(wire);
return NULL;
}
bytes += rc;
}
wire_size = ldns_read_uint16(wire);
LDNS_FREE(wire);
wire = LDNS_XMALLOC(uint8_t, wire_size);
if (!wire) {
*size = 0;
return NULL;
}
bytes = 0;
while (bytes < (ssize_t) wire_size) {
if(!ldns_sock_wait(sockfd, timeout, 0)) {
*size = 0;
LDNS_FREE(wire);
return NULL;
}
rc = recv(sockfd, (void*) (wire + bytes),
(size_t) (wire_size - bytes), 0);
if (rc == -1 || rc == 0) {
LDNS_FREE(wire);
*size = 0;
return NULL;
}
bytes += rc;
}
*size = (size_t) bytes;
return wire;
}
uint8_t *
ldns_tcp_read_wire(int sockfd, size_t *size)
{
uint8_t *wire;
uint16_t wire_size;
ssize_t bytes = 0, rc = 0;
wire = LDNS_XMALLOC(uint8_t, 2);
if (!wire) {
*size = 0;
return NULL;
}
while (bytes < 2) {
rc = recv(sockfd, (void*) (wire + bytes),
(size_t) (2 - bytes), 0);
if (rc == -1 || rc == 0) {
*size = 0;
LDNS_FREE(wire);
return NULL;
}
bytes += rc;
}
wire_size = ldns_read_uint16(wire);
LDNS_FREE(wire);
wire = LDNS_XMALLOC(uint8_t, wire_size);
if (!wire) {
*size = 0;
return NULL;
}
bytes = 0;
while (bytes < (ssize_t) wire_size) {
rc = recv(sockfd, (void*) (wire + bytes),
(size_t) (wire_size - bytes), 0);
if (rc == -1 || rc == 0) {
LDNS_FREE(wire);
*size = 0;
return NULL;
}
bytes += rc;
}
*size = (size_t) bytes;
return wire;
}
/* keep in mind that in DNS tcp messages the first 2 bytes signal the
* amount data to expect
*/
ldns_status
ldns_tcp_send(uint8_t **result, ldns_buffer *qbin, const struct sockaddr_storage *to,
socklen_t tolen, struct timeval timeout, size_t *answer_size)
{
int sockfd;
uint8_t *answer;
sockfd = ldns_tcp_bgsend(qbin, to, tolen, timeout);
if (sockfd == 0) {
return LDNS_STATUS_ERR;
}
answer = ldns_tcp_read_wire_timeout(sockfd, answer_size, timeout);
close_socket(sockfd);
if (*answer_size == 0) {
/* oops */
return LDNS_STATUS_NETWORK_ERR;
}
/* resize accordingly */
*result = (uint8_t*)LDNS_XREALLOC(answer, uint8_t *, (size_t)*answer_size);
if(!*result) {
LDNS_FREE(answer);
return LDNS_STATUS_MEM_ERR;
}
return LDNS_STATUS_OK;
}
int
ldns_tcp_bgsend(ldns_buffer *qbin, const struct sockaddr_storage *to, socklen_t tolen,
struct timeval timeout)
{
int sockfd;
sockfd = ldns_tcp_connect(to, tolen, timeout);
if (sockfd == 0) {
return 0;
}
if (ldns_tcp_send_query(qbin, sockfd, to, tolen) == 0) {
return 0;
}
return sockfd;
}
/* code from rdata.c */
struct sockaddr_storage *
ldns_rdf2native_sockaddr_storage(const ldns_rdf *rd, uint16_t port, size_t *size)
{
struct sockaddr_storage *data;
struct sockaddr_in *data_in;
struct sockaddr_in6 *data_in6;
data = LDNS_MALLOC(struct sockaddr_storage);
if (!data) {
return NULL;
}
/* zero the structure for portability */
memset(data, 0, sizeof(struct sockaddr_storage));
if (port == 0) {
port = LDNS_PORT;
}
switch(ldns_rdf_get_type(rd)) {
case LDNS_RDF_TYPE_A:
data->ss_family = AF_INET;
data_in = (struct sockaddr_in*) data;
data_in->sin_port = (in_port_t)htons(port);
memcpy(&(data_in->sin_addr), ldns_rdf_data(rd), ldns_rdf_size(rd));
*size = sizeof(struct sockaddr_in);
return data;
case LDNS_RDF_TYPE_AAAA:
data->ss_family = AF_INET6;
data_in6 = (struct sockaddr_in6*) data;
data_in6->sin6_port = (in_port_t)htons(port);
memcpy(&data_in6->sin6_addr, ldns_rdf_data(rd), ldns_rdf_size(rd));
*size = sizeof(struct sockaddr_in6);
return data;
default:
LDNS_FREE(data);
return NULL;
}
}
ldns_rdf *
ldns_sockaddr_storage2rdf(struct sockaddr_storage *sock, uint16_t *port)
{
ldns_rdf *addr;
struct sockaddr_in *data_in;
struct sockaddr_in6 *data_in6;
switch(sock->ss_family) {
case AF_INET:
data_in = (struct sockaddr_in*)sock;
if (port) {
*port = ntohs((uint16_t)data_in->sin_port);
}
addr = ldns_rdf_new_frm_data(LDNS_RDF_TYPE_A,
LDNS_IP4ADDRLEN, &data_in->sin_addr);
break;
case AF_INET6:
data_in6 = (struct sockaddr_in6*)sock;
if (port) {
*port = ntohs((uint16_t)data_in6->sin6_port);
}
addr = ldns_rdf_new_frm_data(LDNS_RDF_TYPE_AAAA,
LDNS_IP6ADDRLEN, &data_in6->sin6_addr);
break;
default:
if (port) {
*port = 0;
}
return NULL;
}
return addr;
}
/* code from resolver.c */
ldns_status
ldns_axfr_start(ldns_resolver *resolver, ldns_rdf *domain, ldns_rr_class class)
{
ldns_pkt *query;
ldns_buffer *query_wire;
struct sockaddr_storage *ns = NULL;
size_t ns_len = 0;
size_t ns_i;
ldns_status status;
if (!resolver || ldns_resolver_nameserver_count(resolver) < 1) {
return LDNS_STATUS_ERR;
}
query = ldns_pkt_query_new(ldns_rdf_clone(domain), LDNS_RR_TYPE_AXFR, class, 0);
if (!query) {
return LDNS_STATUS_ADDRESS_ERR;
}
/* For AXFR, we have to make the connection ourselves */
/* try all nameservers (which usually would mean v4 fallback if
* @hostname is used */
for (ns_i = 0;
ns_i < ldns_resolver_nameserver_count(resolver) &&
resolver->_socket == SOCK_INVALID;
ns_i++) {
ns = ldns_rdf2native_sockaddr_storage(
resolver->_nameservers[ns_i],
ldns_resolver_port(resolver), &ns_len);
resolver->_socket = ldns_tcp_connect(ns, (socklen_t)ns_len,
ldns_resolver_timeout(resolver));
}
if (resolver->_socket == SOCK_INVALID) {
ldns_pkt_free(query);
LDNS_FREE(ns);
return LDNS_STATUS_NETWORK_ERR;
}
#ifdef HAVE_SSL
if (ldns_resolver_tsig_keyname(resolver) && ldns_resolver_tsig_keydata(resolver)) {
status = ldns_pkt_tsig_sign(query,
ldns_resolver_tsig_keyname(resolver),
ldns_resolver_tsig_keydata(resolver),
300, ldns_resolver_tsig_algorithm(resolver), NULL);
if (status != LDNS_STATUS_OK) {
/* RoRi: to prevent problems on subsequent calls to ldns_axfr_start
we have to close the socket here! */
close_socket(resolver->_socket);
return LDNS_STATUS_CRYPTO_TSIG_ERR;
}
}
#endif /* HAVE_SSL */
/* Convert the query to a buffer
* Is this necessary?
*/
query_wire = ldns_buffer_new(LDNS_MAX_PACKETLEN);
if(!query_wire) {
ldns_pkt_free(query);
LDNS_FREE(ns);
close_socket(resolver->_socket);
return LDNS_STATUS_MEM_ERR;
}
status = ldns_pkt2buffer_wire(query_wire, query);
if (status != LDNS_STATUS_OK) {
ldns_pkt_free(query);
ldns_buffer_free(query_wire);
LDNS_FREE(ns);
/* RoRi: to prevent problems on subsequent calls to ldns_axfr_start
we have to close the socket here! */
close_socket(resolver->_socket);
return status;
}
/* Send the query */
if (ldns_tcp_send_query(query_wire, resolver->_socket, ns,
(socklen_t)ns_len) == 0) {
ldns_pkt_free(query);
ldns_buffer_free(query_wire);
LDNS_FREE(ns);
/* RoRi: to prevent problems on subsequent calls to ldns_axfr_start
we have to close the socket here! */
close_socket(resolver->_socket);
return LDNS_STATUS_NETWORK_ERR;
}
ldns_pkt_free(query);
ldns_buffer_free(query_wire);
LDNS_FREE(ns);
/*
* The AXFR is done once the second SOA record is sent
*/
resolver->_axfr_soa_count = 0;
return LDNS_STATUS_OK;
}
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