/*-
* (c) Magerya Vitaly
*
* Copying and distribution of this file, with or without modification,
* are permitted in any medium without royalty provided the copyright
* notice and this notice are preserved. This file is offered as-is,
* without any warranty.
*/
#include <ldns/ldns.h>
#include <limits.h>
#include <netdb.h>
#include <netinet/in.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
/* General utilities.
*/
static char *progname;
#define countof(array) (sizeof(array)/sizeof(*(array)))
static void
die(int code, const char *fmt, ...) {
va_list args;
va_start(args, fmt);
fprintf(stderr, "%s: ", progname);
vfprintf(stderr, fmt, args);
fprintf(stderr, "\n");
va_end(args);
exit(code);
}
static int
ndots(const char *name) {
int n;
for (n = 0; (name = strchr(name, '.')); n++, name++);
return n;
}
/* General LDNS-specific utilities.
*/
static ldns_status
ldns_resolver_new_default(ldns_resolver **res) {
if (ldns_resolver_new_frm_file(res, NULL) == LDNS_STATUS_OK ||
(*res = ldns_resolver_new()) != NULL)
return LDNS_STATUS_OK;
return LDNS_STATUS_MEM_ERR;
}
static ldns_status
ldns_resolver_push_default_servers(ldns_resolver *res) {
ldns_status status;
ldns_rdf *addr;
if ((status = ldns_str2rdf_a(&addr, "127.0.0.1")) != LDNS_STATUS_OK ||
(status = ldns_resolver_push_nameserver(res, addr)) != LDNS_STATUS_OK)
return ldns_rdf_deep_free(addr), status;
ldns_rdf_deep_free(addr);
if ((status = ldns_str2rdf_aaaa(&addr, "::1")) != LDNS_STATUS_OK ||
(status = ldns_resolver_push_nameserver(res, addr)) != LDNS_STATUS_OK)
return ldns_rdf_deep_free(addr), status;
ldns_rdf_deep_free(addr);
return LDNS_STATUS_OK;
}
static ldns_rdf *
ldns_rdf_new_addr_frm_str(const char *str) {
ldns_rdf *addr;
if ((addr = ldns_rdf_new_frm_str(LDNS_RDF_TYPE_A, str)) == NULL)
addr = ldns_rdf_new_frm_str(LDNS_RDF_TYPE_AAAA, str);
return addr;
}
static void
ldns_resolver_remove_nameservers(ldns_resolver *res) {
while (ldns_resolver_nameserver_count(res) > 0)
ldns_rdf_deep_free(ldns_resolver_pop_nameserver(res));
}
static ldns_rdf *
ldns_rdf_reverse_a(ldns_rdf *addr, const char *base) {
char *buf;
int i, len;
len = strlen(base);
buf = alloca(LDNS_IP4ADDRLEN*4 + len + 1);
for (len = i = 0; i < LDNS_IP4ADDRLEN; i++)
len += sprintf(&buf[len], "%d.",
(int)ldns_rdf_data(addr)[LDNS_IP4ADDRLEN - i - 1]);
sprintf(&buf[len], "%s", base);
return ldns_dname_new_frm_str(buf);
}
static ldns_rdf *
ldns_rdf_reverse_aaaa(ldns_rdf *addr, const char *base) {
char *buf;
int i, len;
len = strlen(base);
buf = alloca(LDNS_IP6ADDRLEN*4 + len + 1);
for (i = 0; i < LDNS_IP6ADDRLEN; i++) {
uint8_t byte = ldns_rdf_data(addr)[LDNS_IP6ADDRLEN - i - 1];
sprintf(&buf[i*4], "%x.%x.", byte & 0x0F, byte >> 4);
}
sprintf(&buf[LDNS_IP6ADDRLEN*4], "%s", base);
return ldns_dname_new_frm_str(buf);
}
static ldns_status
ldns_pkt_push_rr_soa(ldns_pkt *pkt, ldns_pkt_section sec,
const ldns_rdf *name, ldns_rr_class c, uint32_t serial) {
ldns_rdf *rdf;
ldns_rr *rr;
uint32_t n;
if ((rr = ldns_rr_new_frm_type(LDNS_RR_TYPE_SOA)) == NULL)
return LDNS_STATUS_MEM_ERR;
ldns_rr_set_class(rr, c);
ldns_rr_set_owner(rr, ldns_rdf_clone(name));
ldns_rr_set_ttl(rr, 0);
n = 0;
if ((rdf = ldns_rdf_new_frm_data(LDNS_RDF_TYPE_DNAME, 1, &n)) == NULL)
goto memerr;
ldns_rr_set_rdf(rr, rdf, 0);
ldns_rr_set_rdf(rr, ldns_rdf_clone(rdf), 1);
n = htonl(serial);
if ((rdf = ldns_rdf_new_frm_data(LDNS_RDF_TYPE_INT32, 4, &n)) == NULL)
goto memerr;
ldns_rr_set_rdf(rr, rdf, 2);
n = 0;
if ((rdf = ldns_rdf_new_frm_data(LDNS_RDF_TYPE_PERIOD, 4, &n)) == NULL)
goto memerr;
ldns_rr_set_rdf(rr, rdf, 3);
ldns_rr_set_rdf(rr, ldns_rdf_clone(rdf), 4);
ldns_rr_set_rdf(rr, ldns_rdf_clone(rdf), 5);
ldns_rr_set_rdf(rr, ldns_rdf_clone(rdf), 6);
if (ldns_rr_rdf(rr, 1) == NULL || ldns_rr_rdf(rr, 4) == NULL ||
ldns_rr_rdf(rr, 5) == NULL || ldns_rr_rdf(rr, 6) == NULL ||
!ldns_pkt_push_rr(pkt, sec, rr))
goto memerr;
return LDNS_STATUS_OK;
memerr:
ldns_rr_free(rr);
return LDNS_STATUS_MEM_ERR;
}
static uint32_t
ldns_rr_soa_get_serial(const ldns_rr *rr)
{
const ldns_rdf *rdf;
if (ldns_rr_get_type(rr) != LDNS_RR_TYPE_SOA) return 0;
if (ldns_rr_rd_count(rr) != 7) return 0;
rdf = ldns_rr_rdf(rr, 2);
if (ldns_rdf_get_type(rdf) != LDNS_RDF_TYPE_INT32) return 0;
if (ldns_rdf_size(rdf) != 4) return 0;
return ldns_rdf2native_int32(rdf);
}
static ldns_status
ldns_tcp_start(ldns_resolver *res, ldns_pkt *qpkt, int nameserver) {
/* This routine is based on ldns_axfr_start, with the major
* difference in that it takes a query packet explicitly.
*/
struct sockaddr_storage *ns = NULL;
size_t ns_len = 0;
ldns_buffer *qbuf = NULL;
ldns_status status;
ns = ldns_rdf2native_sockaddr_storage(
res->_nameservers[nameserver], ldns_resolver_port(res), &ns_len);
if (ns == NULL) {
status = LDNS_STATUS_MEM_ERR;
goto error;
}
res->_socket = ldns_tcp_connect(
ns, (socklen_t)ns_len, ldns_resolver_timeout(res));
if (res->_socket <= 0) {
status = LDNS_STATUS_ADDRESS_ERR;
goto error;
}
qbuf = ldns_buffer_new(LDNS_MAX_PACKETLEN);
if (qbuf == NULL) {
status = LDNS_STATUS_MEM_ERR;
goto error;
}
status = ldns_pkt2buffer_wire(qbuf, qpkt);
if (status != LDNS_STATUS_OK)
goto error;
if (ldns_tcp_send_query(qbuf, res->_socket, ns, (socklen_t)ns_len) == 0) {
status = LDNS_STATUS_NETWORK_ERR;
goto error;
}
ldns_buffer_free(qbuf);
free(ns);
return LDNS_STATUS_OK;
error:
ldns_buffer_free(qbuf);
free(ns);
if (res->_socket > 0) {
close(res->_socket);
res->_socket = 0;
}
return status;
}
static ldns_status
ldns_tcp_read(ldns_pkt **answer, ldns_resolver *res) {
ldns_status status;
struct timeval t1, t2;
uint8_t *data;
size_t size;
if (res->_socket <= 0)
return LDNS_STATUS_ERR;
gettimeofday(&t1, NULL);
data = ldns_tcp_read_wire_timeout(
res->_socket, &size, ldns_resolver_timeout(res));
if (data == NULL)
goto error;
status = ldns_wire2pkt(answer, data, size);
free(data);
if (status != LDNS_STATUS_OK)
goto error;
gettimeofday(&t2, NULL);
ldns_pkt_set_querytime(*answer,
(uint32_t)((t2.tv_sec - t1.tv_sec)*1000) +
(t2.tv_usec - t1.tv_usec)/1000);
ldns_pkt_set_timestamp(*answer, t2);
return status;
error:
close(res->_socket);
res->_socket = 0;
return LDNS_STATUS_ERR;
}
static void
ldns_tcp_close(ldns_resolver *res) {
if (res->_socket > 0) {
close(res->_socket);
res->_socket = 0;
}
}
static ldns_status
ldns_resolver_send_to(ldns_pkt **answer, ldns_resolver *res,
const ldns_rdf *name, ldns_rr_type t, ldns_rr_class c,
uint16_t flags, uint32_t ixfr_serial, int nameserver,
bool close_tcp) {
ldns_status status = LDNS_STATUS_OK;
ldns_pkt *qpkt;
struct timeval now;
int nscnt = ldns_resolver_nameserver_count(res);
ldns_rdf **ns = ldns_resolver_nameservers(res);
size_t *rtt = ldns_resolver_rtt(res);
ldns_resolver_set_nameservers(res, &ns[nameserver]);
ldns_resolver_set_rtt(res, &rtt[nameserver]);
ldns_resolver_set_nameserver_count(res, 1);
/* The next fragment should have been a call to
* ldns_resolver_prepare_query_pkt(), but starting with ldns
* version 1.6.17 that function tries to add it's own SOA
* records when rr_type is LDNS_RR_TYPE_IXFR, and we don't
* want that.
*/
qpkt = ldns_pkt_query_new(ldns_rdf_clone(name), t, c, flags);
if (qpkt == NULL) {
status = LDNS_STATUS_ERR;
goto done;
}
now.tv_sec = time(NULL);
now.tv_usec = 0;
ldns_pkt_set_timestamp(qpkt, now);
ldns_pkt_set_random_id(qpkt);
if (t == LDNS_RR_TYPE_IXFR) {
status = ldns_pkt_push_rr_soa(qpkt,
LDNS_SECTION_AUTHORITY, name, c, ixfr_serial);
if (status != LDNS_STATUS_OK) goto done;
}
if (close_tcp) {
status = ldns_resolver_send_pkt(answer, res, qpkt);
} else {
status = ldns_tcp_start(res, qpkt, 0);
if (status != LDNS_STATUS_OK) goto done;
status = ldns_tcp_read(answer, res);
if (status != LDNS_STATUS_OK) goto done;
ldns_pkt_set_answerfrom(*answer, ldns_rdf_clone(ns[0]));
}
done:
ldns_pkt_free(qpkt);
ldns_resolver_set_nameservers(res, ns);
ldns_resolver_set_rtt(res, rtt);
ldns_resolver_set_nameserver_count(res, nscnt);
return status;
}
static void
ldns_pkt_filter_answer(ldns_pkt *pkt, ldns_rr_type type) {
int i, j, cnt;
ldns_rr_list *rrlist;
ldns_rr *rr;
ldns_rr_type rrtype;
rrlist = ldns_pkt_answer(pkt);
cnt = ldns_rr_list_rr_count(rrlist);
for (i = j = 0; i < cnt; i++) {
rr = ldns_rr_list_rr(rrlist, i);
rrtype = ldns_rr_get_type(rr);
if (type == LDNS_RR_TYPE_ANY ||
type == rrtype ||
(type == LDNS_RR_TYPE_AXFR &&
(rrtype == LDNS_RR_TYPE_A ||
rrtype == LDNS_RR_TYPE_AAAA ||
rrtype == LDNS_RR_TYPE_NS ||
rrtype == LDNS_RR_TYPE_PTR)))
ldns_rr_list_set_rr(rrlist, rr, j++);
}
ldns_rr_list_set_rr_count(rrlist, j);
}
/* Packet content printing.
*/
static struct {
ldns_rr_type type;
const char *text;
} rr_types[] = {
{LDNS_RR_TYPE_A, "has address"},
{LDNS_RR_TYPE_NS, "name server"},
{LDNS_RR_TYPE_CNAME, "is an alias for"},
{LDNS_RR_TYPE_WKS, "has well known services"},
{LDNS_RR_TYPE_PTR, "domain name pointer"},
{LDNS_RR_TYPE_HINFO, "host information"},
{LDNS_RR_TYPE_MX, "mail is handled by"},
{LDNS_RR_TYPE_TXT, "descriptive text"},
{LDNS_RR_TYPE_X25, "x25 address"},
{LDNS_RR_TYPE_ISDN, "ISDN address"},
{LDNS_RR_TYPE_SIG, "has signature"},
{LDNS_RR_TYPE_KEY, "has key"},
{LDNS_RR_TYPE_AAAA, "has IPv6 address"},
{LDNS_RR_TYPE_LOC, "location"},
};
static void
print_opcode(ldns_pkt_opcode opcode) {
ldns_lookup_table *lt = ldns_lookup_by_id(ldns_opcodes, opcode);
if (lt && lt->name)
printf("%s", lt->name);
else
printf("RESERVED%d", opcode);
}
static void
print_rcode(uint8_t rcode) {
ldns_lookup_table *lt = ldns_lookup_by_id(ldns_rcodes, rcode);
if (lt && lt->name)
printf("%s", lt->name);
else
printf("RESERVED%d", rcode);
}
static int
print_rr_type(ldns_rr_type type) {
char *str;
int n;
str = ldns_rr_type2str(type);
n = printf("%s", str);
free(str);
return n;
}
static int
print_rr_class(ldns_rr_class cls) {
char *str;
int n;
str = ldns_rr_class2str(cls);
n = printf("%s", str);
free(str);
return n;
}
static int
print_rdf(ldns_rdf *rdf) {
char *str;
int n;
str = ldns_rdf2str(rdf);
n = printf("%s", str);
free(str);
return n;
}
static int
print_rdf_nodot(ldns_rdf *rdf) {
char *str;
int len, n;
str = ldns_rdf2str(rdf);
len = strlen(str);
n = printf("%.*s", str[len-1] == '.' ? len-1 : len, str);
free(str);
return n;
}
static int
print_padding(int fromcol, int tocol) {
int col = fromcol, nextcol = fromcol + 8 - fromcol%8;
if (fromcol + 1 > tocol) tocol = fromcol + 1;
for (; nextcol <= tocol; col = nextcol, nextcol += 8)
printf("\t");
for (; col < tocol; col++)
printf(" ");
return col - fromcol;
}
static void
print_rr_verbose(ldns_rr *rr) {
bool isq = ldns_rr_is_question(rr);
int rdcnt = ldns_rr_rd_count(rr);
int i, n;
/* bind9-host does not count the initial ';' here */
n = isq ? printf(";") : 0;
n = print_rdf(ldns_rr_owner(rr));
if (!isq) {
n += print_padding(n, 24);
n += printf("%d", ldns_rr_ttl(rr));
}
n += print_padding(n, 32);
n += print_rr_class(ldns_rr_get_class(rr));
n += print_padding(n, 40);
n += print_rr_type(ldns_rr_get_type(rr));
for (i = 0; i < rdcnt; i++) {
if (i == 0) print_padding(n, 48);
else printf(" ");
print_rdf(ldns_rr_rdf(rr, i));
}
printf("\n");
}
static void
print_pkt_section_verbose(const char *name, ldns_rr_list *rrlist) {
int i, cnt = ldns_rr_list_rr_count(rrlist);
if (cnt == 0)
return;
printf(";; %s SECTION:\n", name);
for (i = 0; i < cnt; i++)
print_rr_verbose(ldns_rr_list_rr(rrlist, i));
printf("\n");
}
static void
print_pkt_verbose(ldns_pkt *pkt) {
int got_flags = 0;
printf(";; ->>HEADER<<- opcode: ");
print_opcode(ldns_pkt_get_opcode(pkt));
printf(", status: ");
print_rcode(ldns_pkt_get_rcode(pkt));
printf(", id: %u\n", ldns_pkt_id(pkt));
printf(";; flags:");
if (ldns_pkt_qr(pkt)) printf(" qr"), got_flags = 1;
if (ldns_pkt_aa(pkt)) printf(" aa"), got_flags = 1;
if (ldns_pkt_tc(pkt)) printf(" tc"), got_flags = 1;
if (ldns_pkt_rd(pkt)) printf(" rd"), got_flags = 1;
if (ldns_pkt_ra(pkt)) printf(" ra"), got_flags = 1;
if (ldns_pkt_ad(pkt)) printf(" ad"), got_flags = 1;
if (ldns_pkt_cd(pkt)) printf(" cd"), got_flags = 1;
if (!got_flags) printf(" ");
printf("; QUERY: %u, ANSWER: %u, AUTHORITY: %u, ADDITIONAL: %u\n",
ldns_pkt_qdcount(pkt), ldns_pkt_ancount(pkt),
ldns_pkt_nscount(pkt), ldns_pkt_arcount(pkt));
if (ldns_pkt_edns(pkt))
printf(";; EDNS: version: %u, udp=%u\n",
ldns_pkt_edns_version(pkt), ldns_pkt_edns_udp_size(pkt));
printf("\n");
print_pkt_section_verbose("QUESTION", ldns_pkt_question(pkt));
print_pkt_section_verbose("ANSWER", ldns_pkt_answer(pkt));
print_pkt_section_verbose("AUTHORITY", ldns_pkt_authority(pkt));
print_pkt_section_verbose("ADDITIONAL", ldns_pkt_additional(pkt));
}
static void
print_rr_short(ldns_rr *rr) {
ldns_rr_type type = ldns_rr_get_type(rr);
size_t i, rdcnt = ldns_rr_rd_count(rr);
print_rdf_nodot(ldns_rr_owner(rr));
printf(" ");
for (i = 0; i < countof(rr_types); i++) {
if (rr_types[i].type == type) {
printf("%s", rr_types[i].text);
goto found;
}
}
printf("has ");
print_rr_type(type);
printf(" record");
found:
for (i = 0; i < rdcnt; i++) {
printf(" ");
print_rdf(ldns_rr_rdf(rr, i));
}
printf("\n");
}
static void
print_pkt_short(ldns_pkt *pkt, bool print_rr_server) {
ldns_rr_list *rrlist = ldns_pkt_answer(pkt);
size_t i;
for (i = 0; i < ldns_rr_list_rr_count(rrlist); i++) {
if (print_rr_server) {
printf("Nameserver ");
print_rdf(ldns_pkt_answerfrom(pkt));
printf(":\n\t");
}
print_rr_short(ldns_rr_list_rr(rrlist, i));
}
}
static void
print_received_line(ldns_resolver *res, ldns_pkt *pkt) {
char *from = ldns_rdf2str(ldns_pkt_answerfrom(pkt));
printf("Received %zu bytes from %s#%d in %d ms\n",
ldns_pkt_size(pkt), from, ldns_resolver_port(res),
ldns_pkt_querytime(pkt));
free(from);
}
/* Main program.
*
* Note that no memory is freed below this line by intention.
*/
#define DEFAULT_TCP_TIMEOUT 10
#define DEFAULT_UDP_TIMEOUT 5
enum operation_mode { M_AXFR, M_IXFR, M_DEFAULT_Q, M_SINGLE_Q, M_SOA };
static enum operation_mode o_mode = M_DEFAULT_Q;
static bool o_ignore_servfail = true;
static bool o_ip6_int = false;
static bool o_print_pkt_server = false;
static bool o_print_rr_server = false;
static bool o_recursive = true;
static bool o_tcp = false;
static bool o_verbose = false;
static char *o_name = NULL;
static char *o_server = NULL;
static int o_ipversion = LDNS_RESOLV_INETANY;
static int o_ndots = 1;
static int o_retries = 1;
static ldns_rr_class o_rrclass = LDNS_RR_CLASS_IN;
static ldns_rr_type o_rrtype = (ldns_rr_type)-1;
static time_t o_timeout = 0;
static uint32_t o_ixfr_serial = 0;
static void
usage(void) {
fprintf(stderr,
"Usage: %s [-aCdilrsTvw46] [-c class] [-N ndots] [-R number]\n"
" %*c [-t type] [-W wait] name [server]\n"
"\t-a same as -v -t ANY\n"
"\t-C query SOA records from all authoritative name servers\n"
"\t-c use this query class (IN, CH, HS, etc)\n"
"\t-d produce verbose output, same as -v\n"
"\t-i use IP6.INT for IPv6 reverse lookups\n"
"\t-l list records in a zone via AXFR\n"
"\t-N consider names with at least this many dots as absolute\n"
"\t-R retry UDP queries this many times\n"
"\t-r disable recursive query\n"
"\t-s do not ignore SERVFAIL responses\n"
"\t-T send query via TCP\n"
"\t-t use this query type (A, AAAA, MX, etc)\n"
"\t-v produce verbose output\n"
"\t-w wait forever for a server reply\n"
"\t-W wait this many seconds for a reply\n"
"\t-4 use IPv4 only\n"
"\t-6 use IPv6 only\n",
progname, (int)strlen(progname), ' ');
exit(1);
}
static void
parse_args(int argc, char *argv[]) {
int ch;
progname = argv[0];
while ((ch = getopt(argc, argv, "aCdilrsTvw46c:N:R:t:W:")) != -1) {
switch (ch) {
case 'a':
if (o_mode != M_AXFR)
o_mode = M_SINGLE_Q;
o_rrtype = LDNS_RR_TYPE_ANY;
o_verbose = true;
break;
case 'C':
o_mode = M_SOA;
o_print_rr_server = true;
o_rrclass = LDNS_RR_CLASS_IN;
o_rrtype = LDNS_RR_TYPE_NS;
break;
case 'c':
/* bind9-host sets o_mode to M_SINGLE_Q here */
o_rrclass = ldns_get_rr_class_by_name(optarg);
if (o_rrclass <= 0)
die(2, "invalid class: %s\n", optarg);
break;
case 'd': o_verbose = true; break;
case 'i': o_ip6_int = true; break;
case 'l':
o_mode = M_AXFR;
if (o_rrtype == (ldns_rr_type)-1)
o_rrtype = LDNS_RR_TYPE_AXFR;
o_tcp = true;
break;
case 'N':
o_ndots = atoi(optarg);
if (o_ndots < 0) o_ndots = 0;
break;
case 'n':
/* bind9-host accepts and ignores this option */
break;
case 'r': o_recursive = 0; break;
case 'R':
o_retries = atoi(optarg);
if (o_retries <= 0) o_retries = 1;
if (o_retries > 255) o_retries = 255;
break;
case 's': o_ignore_servfail = false; break;
case 'T': o_tcp = true; break;
case 't':
if (o_mode != M_AXFR)
o_mode = M_SINGLE_Q;
if (strncasecmp(optarg, "ixfr=", 5) == 0) {
o_rrtype = LDNS_RR_TYPE_IXFR;
o_ixfr_serial = atol(optarg + 5);
} else {
o_rrtype = ldns_get_rr_type_by_name(optarg);
if (o_rrtype <= 0)
die(2, "invalid type: %s\n", optarg);
}
if (o_rrtype == LDNS_RR_TYPE_AXFR) {
o_mode = M_AXFR;
o_rrtype = LDNS_RR_TYPE_ANY;
o_verbose = true;
}
if (o_rrtype == LDNS_RR_TYPE_IXFR) {
o_mode = M_IXFR;
o_rrtype = LDNS_RR_TYPE_ANY;
}
break;
case 'v': o_verbose = true; break;
case 'w':
o_timeout = (time_t)INT_MAX;
break;
case 'W':
o_timeout = atol(optarg);
if (o_timeout <= 0) o_timeout = 1;
break;
case '4': o_ipversion = LDNS_RESOLV_INET; break;
case '6': o_ipversion = LDNS_RESOLV_INET6; break;
default:
usage();
}
}
argc -= optind;
argv += optind;
/* bind9-host ignores arguments after the 2-nd one */
if (argc < 1)
usage();
o_name = argv[0];
if (argc > 1) {
o_server = argv[1];
o_print_pkt_server = true;
}
if (o_rrtype == (ldns_rr_type)-1)
o_rrtype = LDNS_RR_TYPE_A;
}
static ldns_rdf*
safe_str2rdf_dname(const char *name) {
ldns_rdf *dname;
ldns_status status;
if ((status = ldns_str2rdf_dname(&dname, name)) != LDNS_STATUS_OK) {
die(1, "'%s' is not a legal name (%s)",
name, ldns_get_errorstr_by_id(status));
}
return dname;
}
static ldns_rdf*
safe_dname_cat_clone(const ldns_rdf *rd1, const ldns_rdf *rd2) {
ldns_rdf *result = ldns_dname_cat_clone(rd1, rd2);
if (!result)
die(1, "not enought memory for a domain name");
/* Why doesn't ldns_dname_cat_clone check this condition? */
if (ldns_rdf_size(result) > LDNS_MAX_DOMAINLEN)
die(1, "'%s' is not a legal name (%s)\n", ldns_rdf2str(result),
ldns_get_errorstr_by_id(LDNS_STATUS_DOMAINNAME_OVERFLOW));
return result;
}
static bool
query(ldns_resolver *res, ldns_rdf *domain, ldns_pkt **pkt, bool close_tcp) {
ldns_status status;
ldns_pkt_rcode rcode;
int i, cnt;
if (o_verbose) {
printf("Trying \"");
print_rdf_nodot(domain);
printf("\"\n");
}
for (cnt = ldns_resolver_nameserver_count(res), i = 0; i < cnt; i++) {
status = ldns_resolver_send_to(pkt, res, domain, o_rrtype,
o_rrclass, o_recursive ? LDNS_RD : 0, o_ixfr_serial, i,
close_tcp);
if (status != LDNS_STATUS_OK) {
*pkt = NULL;
continue;
}
if (ldns_pkt_tc(*pkt) && !ldns_resolver_usevc(res)) {
if (o_verbose)
printf(";; Truncated, retrying in TCP mode.\n");
ldns_resolver_set_usevc(res, true);
status = ldns_resolver_send_to(pkt, res, domain, o_rrtype,
o_rrclass, o_recursive ? LDNS_RD : 0, o_ixfr_serial, i,
close_tcp);
ldns_resolver_set_usevc(res, false);
if (status != LDNS_STATUS_OK)
continue;
}
rcode = ldns_pkt_get_rcode(*pkt);
if (o_ignore_servfail && rcode == LDNS_RCODE_SERVFAIL && cnt > 1)
continue;
return rcode == LDNS_RCODE_NOERROR;
}
if (*pkt == NULL) {
printf(";; connection timed out; no servers could be reached\n");
exit(1);
}
return false;
}
static ldns_rdf *
search(ldns_resolver *res, ldns_rdf *domain, ldns_pkt **pkt,
bool absolute, bool close_tcp) {
ldns_rdf *dname, **searchlist;
int i, n;
if (absolute && query(res, domain, pkt, close_tcp))
return domain;
if ((dname = ldns_resolver_domain(res)) != NULL) {
dname = safe_dname_cat_clone(domain, dname);
if (query(res, dname, pkt, close_tcp))
return dname;
}
searchlist = ldns_resolver_searchlist(res);
n = ldns_resolver_searchlist_count(res);
for (i = 0; i < n; i++) {
dname = safe_dname_cat_clone(domain, searchlist[i]);
if (query(res, dname, pkt, close_tcp))
return dname;
}
if (!absolute && query(res, domain, pkt, close_tcp))
return domain;
return NULL;
}
static void
report(ldns_resolver *res, ldns_rdf *domain, ldns_pkt *pkt) {
ldns_pkt_rcode rcode;
if (o_print_pkt_server) {
printf("Using domain server:\nName: %s\nAddress: ", o_server);
print_rdf(ldns_pkt_answerfrom(pkt));
printf("#%d\nAliases: \n\n", ldns_resolver_port(res));
o_print_pkt_server = false;
}
rcode = ldns_pkt_get_rcode(pkt);
if (rcode != LDNS_RCODE_NOERROR) {
printf("Host ");
print_rdf_nodot(domain);
printf(" not found: %d(", rcode);
print_rcode(rcode);
printf(")\n");
} else {
if (o_verbose) {
print_pkt_verbose(pkt);
} else {
print_pkt_short(pkt, o_print_rr_server);
if (o_mode == M_SINGLE_Q &&
ldns_rr_list_rr_count(ldns_pkt_answer(pkt)) == 0) {
print_rdf_nodot(domain);
printf(" has no ");
print_rr_type(o_rrtype);
printf(" record\n");
}
}
}
if (o_verbose)
print_received_line(res, pkt);
}
static bool
doquery(ldns_resolver *res, ldns_rdf *domain) {
ldns_pkt *pkt;
bool q;
q = query(res, domain, &pkt, true);
report(res, domain, pkt);
return q;
}
static bool
doquery_filtered(ldns_resolver *res, ldns_rdf *domain) {
ldns_pkt *pkt;
bool q;
q = query(res, domain, &pkt, true);
ldns_pkt_filter_answer(pkt, o_rrtype);
report(res, domain, pkt);
return q;
}
static bool
dosearch(ldns_resolver *res, ldns_rdf *domain, bool absolute) {
ldns_pkt *pkt;
ldns_rdf *dname;
dname = search(res, domain, &pkt, absolute, true);
report(res, dname != NULL ? dname : domain, pkt);
return o_mode != M_DEFAULT_Q ? (dname != NULL) :
(dname != NULL) &&
(o_rrtype = LDNS_RR_TYPE_AAAA, doquery_filtered(res, dname)) &&
(o_rrtype = LDNS_RR_TYPE_MX, doquery_filtered(res, dname));
}
static bool
dozonetransfer(ldns_resolver *res, ldns_rdf *domain, bool absolute) {
ldns_pkt *pkt, *nextpkt;
ldns_rdf *dname;
ldns_rr_type rrtype;
ldns_rr_list *rrl;
ldns_rr *rr;
size_t i, nsoa = 0;
uint32_t first_serial = 0;
rrtype = o_rrtype;
o_rrtype = (o_mode == M_AXFR) ? LDNS_RR_TYPE_AXFR : LDNS_RR_TYPE_IXFR;
dname = search(res, domain, &pkt, absolute, false);
for (;;) {
rrl = ldns_rr_list_clone(ldns_pkt_answer(pkt));
ldns_pkt_filter_answer(pkt, rrtype);
report(res, dname != NULL ? dname : domain, pkt);
if ((dname == NULL) ||
(ldns_pkt_get_rcode(pkt) != LDNS_RCODE_NOERROR)) {
printf("; Transfer failed.\n");
ldns_tcp_close(res);
return false;
}
for (i = 0; i < ldns_rr_list_rr_count(rrl); i++) {
rr = ldns_rr_list_rr(rrl, i);
if (nsoa == 0) {
if (ldns_rr_get_type(rr) != LDNS_RR_TYPE_SOA) {
printf("; Transfer failed. "
"Didn't start with SOA answer.\n");
ldns_tcp_close(res);
return false;
}
first_serial = ldns_rr_soa_get_serial(rr);
if ((o_mode == M_IXFR) && (first_serial <= o_ixfr_serial)) {
ldns_tcp_close(res);
return true;
}
}
if (ldns_rr_get_type(rr) == LDNS_RR_TYPE_SOA) {
nsoa = nsoa < 2 ? nsoa + 1 : 1;
if ((nsoa == 2) &&
(ldns_rr_soa_get_serial(rr) == first_serial)) {
ldns_tcp_close(res);
return true;
}
}
}
if (ldns_tcp_read(&nextpkt, res) != LDNS_STATUS_OK) {
printf("; Transfer failed.\n");
return false;
}
ldns_pkt_set_answerfrom(nextpkt,
ldns_rdf_clone(ldns_pkt_answerfrom(pkt)));
ldns_pkt_free(pkt);
ldns_rr_list_free(rrl);
pkt = nextpkt;
}
}
static bool
dosoa(ldns_resolver *res, ldns_rdf *domain, bool absolute) {
ldns_rr_list *answer, **nsaddrs;
ldns_rdf *dname, *addr;
ldns_pkt *pkt;
ldns_rr *rr;
size_t i, j, n, cnt;
if ((dname = search(res, domain, &pkt, absolute, true)) == NULL)
return false;
answer = ldns_pkt_answer(pkt);
cnt = ldns_rr_list_rr_count(answer);
nsaddrs = alloca(cnt*sizeof(*nsaddrs));
for (n = 0, i = 0; i < cnt; i++)
if ((addr = ldns_rr_ns_nsdname(ldns_rr_list_rr(answer, i))) != NULL)
nsaddrs[n++] = ldns_get_rr_list_addr_by_name(res,
addr, LDNS_RR_CLASS_IN, 0);
o_print_pkt_server = false;
o_recursive = false;
o_rrtype = LDNS_RR_TYPE_SOA;
for (i = 0; i < n; i++) {
cnt = ldns_rr_list_rr_count(nsaddrs[i]);
for (j = 0; j < cnt; j++) {
ldns_resolver_remove_nameservers(res);
rr = ldns_rr_list_rr(nsaddrs[i], j);
if ((ldns_resolver_ip6(res) == LDNS_RESOLV_INET &&
ldns_rr_get_type(rr) == LDNS_RR_TYPE_AAAA) ||
(ldns_resolver_ip6(res) == LDNS_RESOLV_INET6 &&
ldns_rr_get_type(rr) == LDNS_RR_TYPE_A))
continue;
if (ldns_resolver_push_nameserver_rr(res, rr) == LDNS_STATUS_OK)
/* bind9-host queries for domain, not dname here */
doquery(res, dname);
}
}
return 0;
}
static void
resolver_set_nameserver_hostname(ldns_resolver *res, const char *server) {
struct addrinfo hints, *ailist, *ai;
ldns_status status;
ldns_rdf *rdf;
int err;
memset(&hints, 0, sizeof hints);
switch (ldns_resolver_ip6(res)) {
case LDNS_RESOLV_INET: hints.ai_family = PF_INET; break;
case LDNS_RESOLV_INET6: hints.ai_family = PF_INET6; break;
default: hints.ai_family = PF_UNSPEC; break;
}
hints.ai_socktype = SOCK_STREAM;
do err = getaddrinfo(server, NULL, &hints, &ailist);
while (err == EAI_AGAIN);
if (err != 0)
die(1, "couldn't get address for '%s': %s", server, gai_strerror(err));
for (ai = ailist; ai != NULL; ai = ai->ai_next) {
if ((rdf = ldns_sockaddr_storage2rdf((void*)ai->ai_addr, NULL)) == NULL)
die(1, "couldn't allocate an rdf: %s",
ldns_get_errorstr_by_id(LDNS_STATUS_MEM_ERR));
status = ldns_resolver_push_nameserver(res, rdf);
if (status != LDNS_STATUS_OK)
die(1, "couldn't push a nameserver address: %s",
ldns_get_errorstr_by_id(status));
}
}
static void
resolver_set_nameserver_str(ldns_resolver *res, const char *server) {
ldns_rdf *addr;
ldns_resolver_remove_nameservers(res);
addr = ldns_rdf_new_addr_frm_str(server);
if (addr) {
if (ldns_resolver_push_nameserver(res, addr) != LDNS_STATUS_OK)
die(1, "couldn't push a nameserver address");
} else
resolver_set_nameserver_hostname(res, server);
}
int
main(int argc, char *argv[]) {
ldns_rdf *addr, *dname;
ldns_resolver *res;
ldns_status status;
struct timeval restimeout;
parse_args(argc, argv);
status = ldns_resolver_new_default(&res);
if (status != LDNS_STATUS_OK)
die(1, "error creating resolver: %s", ldns_get_errorstr_by_id(status));
if (ldns_resolver_nameserver_count(res) == 0)
ldns_resolver_push_default_servers(res);
ldns_resolver_set_usevc(res, o_tcp);
restimeout.tv_sec = o_timeout > 0 ? o_timeout :
o_tcp ? DEFAULT_TCP_TIMEOUT : DEFAULT_UDP_TIMEOUT;
restimeout.tv_usec = 0;
ldns_resolver_set_timeout(res, restimeout);
ldns_resolver_set_retry(res, o_retries+1);
ldns_resolver_set_ip6(res, o_ipversion);
ldns_resolver_set_defnames(res, false);
ldns_resolver_set_fallback(res, false);
if (o_server)
resolver_set_nameserver_str(res, o_server);
if (ldns_str2rdf_a(&addr, o_name) == LDNS_STATUS_OK) {
dname = ldns_rdf_reverse_a(addr, "in-addr.arpa");
if (dname == NULL)
die(1, "can't reverse '%s': %s", o_name,
ldns_get_errorstr_by_id(LDNS_STATUS_MEM_ERR));
o_mode = M_SINGLE_Q;
o_rrtype = LDNS_RR_TYPE_PTR;
return !doquery(res, dname);
} else if (ldns_str2rdf_aaaa(&addr, o_name) == LDNS_STATUS_OK) {
dname = ldns_rdf_reverse_aaaa(addr, o_ip6_int ? "ip6.int" : "ip6.arpa");
if (dname == NULL)
die(1, "can't reverse '%s': %s", o_name,
ldns_get_errorstr_by_id(LDNS_STATUS_MEM_ERR));
o_mode = M_SINGLE_Q;
o_rrtype = LDNS_RR_TYPE_PTR;
return !doquery(res, dname);
}
return !(o_mode == M_SOA ? dosoa :
o_mode == M_AXFR ? dozonetransfer :
o_mode == M_IXFR ? dozonetransfer :
dosearch)
(res, safe_str2rdf_dname(o_name), ndots(o_name) >= o_ndots);
}
