static void dump_answer(unsigned index, const pj_dns_parsed_rr *rr)
{
const pj_str_t root_name = { "<Root>", 6 };
const pj_str_t *name = &rr->name;
char ttl_words[32];
char addr[PJ_INET6_ADDRSTRLEN];
if (name->slen == 0)
name = &root_name;
PJ_LOG(3,(THIS_FILE, " %d. %s record (type=%d)",
index, pj_dns_get_type_name(rr->type),
rr->type));
PJ_LOG(3,(THIS_FILE, " Name: %.*s", (int)name->slen, name->ptr));
PJ_LOG(3,(THIS_FILE, " TTL: %u (%s)", rr->ttl,
spell_ttl(ttl_words, sizeof(ttl_words), rr->ttl)));
PJ_LOG(3,(THIS_FILE, " Data length: %u", rr->rdlength));
if (rr->type == PJ_DNS_TYPE_SRV) {
PJ_LOG(3,(THIS_FILE, " SRV: prio=%d, weight=%d %.*s:%d",
rr->rdata.srv.prio, rr->rdata.srv.weight,
(int)rr->rdata.srv.target.slen,
rr->rdata.srv.target.ptr,
rr->rdata.srv.port));
} else if (rr->type == PJ_DNS_TYPE_CNAME ||
rr->type == PJ_DNS_TYPE_NS ||
rr->type == PJ_DNS_TYPE_PTR)
{
PJ_LOG(3,(THIS_FILE, " Name: %.*s",
(int)rr->rdata.cname.name.slen,
rr->rdata.cname.name.ptr));
} else if (rr->type == PJ_DNS_TYPE_A) {
PJ_LOG(3,(THIS_FILE, " IP address: %s",
pj_inet_ntop2(pj_AF_INET(), &rr->rdata.a.ip_addr,
addr, sizeof(addr))));
} else if (rr->type == PJ_DNS_TYPE_AAAA) {
PJ_LOG(3,(THIS_FILE, " IPv6 address: %s",
pj_inet_ntop2(pj_AF_INET6(), &rr->rdata.aaaa.ip_addr,
addr, sizeof(addr))));
}
}
/* Read UDP packet */
PJ_DEF(pj_status_t) pj_pcap_read_udp(pj_pcap_file *file,
pj_pcap_udp_hdr *udp_hdr,
pj_uint8_t *udp_payload,
pj_size_t *udp_payload_size)
{
PJ_ASSERT_RETURN(file && udp_payload && udp_payload_size, PJ_EINVAL);
PJ_ASSERT_RETURN(*udp_payload_size, PJ_EINVAL);
/* Check data link type in PCAP file header */
if ((file->filter.link &&
file->hdr.network != (pj_uint32_t)file->filter.link) ||
file->hdr.network != PJ_PCAP_LINK_TYPE_ETH)
{
/* Link header other than Ethernet is not supported for now */
return PJ_ENOTSUP;
}
/* Loop until we have the packet */
for (;;) {
union {
pj_pcap_rec_hdr rec;
pj_pcap_eth_hdr eth;
pj_pcap_ip_hdr ip;
pj_pcap_udp_hdr udp;
} tmp;
unsigned rec_incl;
pj_ssize_t sz;
pj_size_t sz_read = 0;
char addr[PJ_INET_ADDRSTRLEN];
pj_status_t status;
TRACE_((file->obj_name, "Reading packet.."));
pj_bzero(&addr, sizeof(addr));
/* Read PCAP packet header */
sz = sizeof(tmp.rec);
status = read_file(file, &tmp.rec, &sz);
if (status != PJ_SUCCESS) {
TRACE_((file->obj_name, "read_file() error: %d", status));
return status;
}
rec_incl = tmp.rec.incl_len;
/* Swap byte ordering */
if (file->swap) {
tmp.rec.incl_len = pj_ntohl(tmp.rec.incl_len);
tmp.rec.orig_len = pj_ntohl(tmp.rec.orig_len);
tmp.rec.ts_sec = pj_ntohl(tmp.rec.ts_sec);
tmp.rec.ts_usec = pj_ntohl(tmp.rec.ts_usec);
}
/* Read link layer header */
switch (file->hdr.network) {
case PJ_PCAP_LINK_TYPE_ETH:
sz = sizeof(tmp.eth);
status = read_file(file, &tmp.eth, &sz);
break;
default:
TRACE_((file->obj_name, "Error: link layer not Ethernet"));
return PJ_ENOTSUP;
}
if (status != PJ_SUCCESS) {
TRACE_((file->obj_name, "Error reading Eth header: %d", status));
return status;
}
sz_read += sz;
/* Read IP header */
sz = sizeof(tmp.ip);
status = read_file(file, &tmp.ip, &sz);
if (status != PJ_SUCCESS) {
TRACE_((file->obj_name, "Error reading IP header: %d", status));
return status;
}
sz_read += sz;
/* Skip if IP source mismatch */
if (file->filter.ip_src && tmp.ip.ip_src != file->filter.ip_src) {
TRACE_((file->obj_name, "IP source %s mismatch, skipping",
pj_inet_ntop2(pj_AF_INET(), (pj_in_addr*)&tmp.ip.ip_src,
addr, sizeof(addr))));
SKIP_PKT();
continue;
}
/* Skip if IP destination mismatch */
if (file->filter.ip_dst && tmp.ip.ip_dst != file->filter.ip_dst) {
TRACE_((file->obj_name, "IP detination %s mismatch, skipping",
pj_inet_ntop2(pj_AF_INET(), (pj_in_addr*)&tmp.ip.ip_dst,
addr, sizeof(addr))));
SKIP_PKT();
continue;
}
/* Skip if proto mismatch */
if (file->filter.proto && tmp.ip.proto != file->filter.proto) {
TRACE_((file->obj_name, "IP proto %d mismatch, skipping",
tmp.ip.proto));
SKIP_PKT();
continue;
}
/* Read transport layer header */
switch (tmp.ip.proto) {
case PJ_PCAP_PROTO_TYPE_UDP:
sz = sizeof(tmp.udp);
status = read_file(file, &tmp.udp, &sz);
if (status != PJ_SUCCESS) {
TRACE_((file->obj_name, "Error reading UDP header: %d",status));
return status;
}
sz_read += sz;
/* Skip if source port mismatch */
if (file->filter.src_port &&
tmp.udp.src_port != file->filter.src_port)
{
TRACE_((file->obj_name, "UDP src port %d mismatch, skipping",
pj_ntohs(tmp.udp.src_port)));
SKIP_PKT();
continue;
}
/* Skip if destination port mismatch */
if (file->filter.dst_port &&
tmp.udp.dst_port != file->filter.dst_port)
{
TRACE_((file->obj_name, "UDP dst port %d mismatch, skipping",
pj_ntohs(tmp.udp.dst_port)));
SKIP_PKT();
continue;
}
/* Copy UDP header if caller wants it */
if (udp_hdr) {
pj_memcpy(udp_hdr, &tmp.udp, sizeof(*udp_hdr));
}
/* Calculate payload size */
sz = pj_ntohs(tmp.udp.len) - sizeof(tmp.udp);
break;
default:
TRACE_((file->obj_name, "Not UDP, skipping"));
SKIP_PKT();
continue;
}
/* Check if payload fits the buffer */
if (sz > (pj_ssize_t)*udp_payload_size) {
TRACE_((file->obj_name,
"Error: packet too large (%d bytes required)", sz));
SKIP_PKT();
return PJ_ETOOSMALL;
}
/* Read the payload */
status = read_file(file, udp_payload, &sz);
if (status != PJ_SUCCESS) {
TRACE_((file->obj_name, "Error reading payload: %d", status));
return status;
}
sz_read += sz;
*udp_payload_size = sz;
// Some layers may have trailer, e.g: link eth2.
/* Check that we've read all the packets */
//PJ_ASSERT_RETURN(sz_read == rec_incl, PJ_EBUG);
/* Skip trailer */
while (sz_read < rec_incl) {
sz = rec_incl - sz_read;
status = read_file(file, &tmp.eth, &sz);
if (status != PJ_SUCCESS) {
TRACE_((file->obj_name, "Error reading trailer: %d", status));
return status;
}
sz_read += sz;
}
return PJ_SUCCESS;
}
/* Does not reach here */
}
/*
* This is the main function for performing server resolution.
*/
PJ_DEF(void) pjsip_resolve( pjsip_resolver_t *resolver,
pj_pool_t *pool,
const pjsip_host_info *target,
void *token,
pjsip_resolver_callback *cb)
{
pjsip_server_addresses svr_addr;
pj_status_t status = PJ_SUCCESS;
int ip_addr_ver;
struct query *query;
pjsip_transport_type_e type = target->type;
/* Is it IP address or hostname? And if it's an IP, which version? */
ip_addr_ver = get_ip_addr_ver(&target->addr.host);
/* Set the transport type if not explicitly specified.
* RFC 3263 section 4.1 specify rules to set up this.
*/
if (type == PJSIP_TRANSPORT_UNSPECIFIED) {
if (ip_addr_ver || (target->addr.port != 0)) {
#if PJ_HAS_TCP
if (target->flag & PJSIP_TRANSPORT_SECURE)
{
type = PJSIP_TRANSPORT_TLS;
} else if (target->flag & PJSIP_TRANSPORT_RELIABLE)
{
type = PJSIP_TRANSPORT_TCP;
} else
#endif
{
type = PJSIP_TRANSPORT_UDP;
}
} else {
/* No type or explicit port is specified, and the address is
* not IP address.
* In this case, full resolution must be performed.
* But we don't support it (yet).
*/
#if PJ_HAS_TCP
if (target->flag & PJSIP_TRANSPORT_SECURE)
{
type = PJSIP_TRANSPORT_TLS;
} else if (target->flag & PJSIP_TRANSPORT_RELIABLE)
{
type = PJSIP_TRANSPORT_TCP;
} else
#endif
{
type = PJSIP_TRANSPORT_UDP;
}
}
/* Add IPv6 flag for IPv6 address */
if (ip_addr_ver == 6)
type = (pjsip_transport_type_e)((int)type + PJSIP_TRANSPORT_IPV6);
}
/* If target is an IP address, or if resolver is not configured,
* we can just finish the resolution now using pj_gethostbyname()
*/
if (ip_addr_ver || resolver->res == NULL) {
char ip_addr[PJ_INET6_ADDRSTRLEN];
int af;
pj_addrinfo ai;
unsigned count;
pj_uint16_t srv_port;
if (!ip_addr_ver) {
PJ_LOG(5,(THIS_FILE,
"DNS resolver not available, target '%.*s:%d' type=%s "
"will be resolved with gethostbyname()",
target->addr.host.slen,
target->addr.host.ptr,
target->addr.port,
pjsip_transport_get_type_name(target->type)));
}
/* Set the port number if not specified. */
if (target->addr.port == 0) {
srv_port = (pj_uint16_t)
pjsip_transport_get_default_port_for_type(type);
} else {
srv_port = (pj_uint16_t)target->addr.port;
}
if (type & PJSIP_TRANSPORT_IPV6) {
af = pj_AF_INET6();
} else {
af = pj_AF_INET();
}
/* Resolve */
count = 1;
status = pj_getaddrinfo(af, &target->addr.host, &count, &ai);
if (status != PJ_SUCCESS)
goto on_error;
svr_addr.entry[0].addr.addr.sa_family = (pj_uint16_t)af;
pj_memcpy(&svr_addr.entry[0].addr, &ai.ai_addr, sizeof(pj_sockaddr));
if (af == pj_AF_INET6()) {
svr_addr.entry[0].addr.ipv6.sin6_port = pj_htons(srv_port);
} else {
svr_addr.entry[0].addr.ipv4.sin_port = pj_htons(srv_port);
}
/* Call the callback. */
PJ_LOG(5,(THIS_FILE,
"Target '%.*s:%d' type=%s resolved to "
"'%s:%d' type=%s (%s)",
(int)target->addr.host.slen,
target->addr.host.ptr,
target->addr.port,
pjsip_transport_get_type_name(target->type),
pj_inet_ntop2(af, pj_sockaddr_get_addr(&svr_addr.entry[0].addr),
ip_addr, sizeof(ip_addr)),
srv_port,
pjsip_transport_get_type_name(type),
pjsip_transport_get_type_desc(type)));
svr_addr.count = 1;
svr_addr.entry[0].priority = 0;
svr_addr.entry[0].weight = 0;
svr_addr.entry[0].type = type;
svr_addr.entry[0].addr_len = pj_sockaddr_get_len(&svr_addr.entry[0].addr);
(*cb)(status, token, &svr_addr);
/* Done. */
return;
}
/* Target is not an IP address so we need to resolve it. */
#if PJSIP_HAS_RESOLVER
/* Build the query state */
query = PJ_POOL_ZALLOC_T(pool, struct query);
query->objname = THIS_FILE;
query->token = token;
query->cb = cb;
query->req.target = *target;
pj_strdup(pool, &query->req.target.addr.host, &target->addr.host);
/* If port is not specified, start with SRV resolution
* (should be with NAPTR, but we'll do that later)
*/
PJ_TODO(SUPPORT_DNS_NAPTR);
/* Build dummy NAPTR entry */
query->naptr_cnt = 1;
pj_bzero(&query->naptr[0], sizeof(query->naptr[0]));
query->naptr[0].order = 0;
query->naptr[0].pref = 0;
query->naptr[0].type = type;
pj_strdup(pool, &query->naptr[0].name, &target->addr.host);
/* Start DNS SRV or A resolution, depending on whether port is specified */
if (target->addr.port == 0) {
query->query_type = PJ_DNS_TYPE_SRV;
query->req.def_port = 5060;
if (type == PJSIP_TRANSPORT_TLS) {
query->naptr[0].res_type = pj_str("_sips._tcp.");
query->req.def_port = 5061;
} else if (type == PJSIP_TRANSPORT_TCP)
query->naptr[0].res_type = pj_str("_sip._tcp.");
else if (type == PJSIP_TRANSPORT_UDP)
query->naptr[0].res_type = pj_str("_sip._udp.");
else {
pj_assert(!"Unknown transport type");
query->naptr[0].res_type = pj_str("_sip._udp.");
}
} else {
/* Otherwise if port is specified, start with A (or AAAA) host
* resolution
*/
query->query_type = PJ_DNS_TYPE_A;
query->naptr[0].res_type.slen = 0;
query->req.def_port = target->addr.port;
}
/* Start the asynchronous query */
PJ_LOG(5, (query->objname,
"Starting async DNS %s query: target=%.*s%.*s, transport=%s, "
"port=%d",
pj_dns_get_type_name(query->query_type),
(int)query->naptr[0].res_type.slen,
query->naptr[0].res_type.ptr,
(int)query->naptr[0].name.slen, query->naptr[0].name.ptr,
pjsip_transport_get_type_name(target->type),
target->addr.port));
if (query->query_type == PJ_DNS_TYPE_SRV) {
status = pj_dns_srv_resolve(&query->naptr[0].name,
&query->naptr[0].res_type,
query->req.def_port, pool, resolver->res,
PJ_TRUE, query, &srv_resolver_cb, NULL);
} else if (query->query_type == PJ_DNS_TYPE_A) {
status = pj_dns_resolver_start_query(resolver->res,
&query->naptr[0].name,
PJ_DNS_TYPE_A, 0,
&dns_a_callback,
query, &query->object);
} else {
pj_assert(!"Unexpected");
status = PJ_EBUG;
}
if (status != PJ_SUCCESS)
goto on_error;
return;
#else /* PJSIP_HAS_RESOLVER */
PJ_UNUSED_ARG(pool);
PJ_UNUSED_ARG(query);
PJ_UNUSED_ARG(srv_name);
#endif /* PJSIP_HAS_RESOLVER */
on_error:
if (status != PJ_SUCCESS) {
char errmsg[PJ_ERR_MSG_SIZE];
PJ_LOG(4,(THIS_FILE, "Failed to resolve '%.*s'. Err=%d (%s)",
(int)target->addr.host.slen,
target->addr.host.ptr,
status,
pj_strerror(status,errmsg,sizeof(errmsg)).ptr));
(*cb)(status, token, NULL);
return;
}
}
