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dns.c
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/*
+----------------------------------------------------------------------+
| Copyright (c) The PHP Group |
+----------------------------------------------------------------------+
| This source file is subject to version 3.01 of the PHP license, |
| that is bundled with this package in the file LICENSE, and is |
| available through the world-wide-web at the following url: |
| https://www.php.net/license/3_01.txt |
| If you did not receive a copy of the PHP license and are unable to |
| obtain it through the world-wide-web, please send a note to |
| [email protected] so we can mail you a copy immediately. |
+----------------------------------------------------------------------+
| Authors: The typical suspects |
| Pollita <[email protected]> |
| Marcus Boerger <[email protected]> |
+----------------------------------------------------------------------+
*/
/* {{{ includes */
#include "php.h"
#include "php_network.h"
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#ifdef PHP_WIN32
# include "win32/inet.h"
# include <winsock2.h>
# include <windows.h>
# include <Ws2tcpip.h>
#else
#include <netinet/in.h>
#ifdef HAVE_ARPA_INET_H
#include <arpa/inet.h>
#endif
#include <netdb.h>
#ifdef _OSD_POSIX
#undef STATUS
#undef T_UNSPEC
#endif
#ifdef HAVE_ARPA_NAMESER_H
#ifdef DARWIN
# define BIND_8_COMPAT 1
#endif
#include <arpa/nameser.h>
#endif
#ifdef HAVE_RESOLV_H
#include <resolv.h>
#if defined(__HAIKU__)
extern void __res_ndestroy(res_state statp);
#define res_ndestroy __res_ndestroy
#endif
#endif
#ifdef HAVE_DNS_H
#include <dns.h>
#endif
#endif
#ifndef MAXHOSTNAMELEN
#define MAXHOSTNAMELEN 255
#endif
/* For the local hostname obtained via gethostname which is different from the
dns-related MAXHOSTNAMELEN constant above */
#ifndef HOST_NAME_MAX
#define HOST_NAME_MAX 255
#endif
#include "php_dns.h"
/* type compat */
#ifndef DNS_T_A
#define DNS_T_A 1
#endif
#ifndef DNS_T_NS
#define DNS_T_NS 2
#endif
#ifndef DNS_T_CNAME
#define DNS_T_CNAME 5
#endif
#ifndef DNS_T_SOA
#define DNS_T_SOA 6
#endif
#ifndef DNS_T_PTR
#define DNS_T_PTR 12
#endif
#ifndef DNS_T_HINFO
#define DNS_T_HINFO 13
#endif
#ifndef DNS_T_MINFO
#define DNS_T_MINFO 14
#endif
#ifndef DNS_T_MX
#define DNS_T_MX 15
#endif
#ifndef DNS_T_TXT
#define DNS_T_TXT 16
#endif
#ifndef DNS_T_AAAA
#define DNS_T_AAAA 28
#endif
#ifndef DNS_T_SRV
#define DNS_T_SRV 33
#endif
#ifndef DNS_T_NAPTR
#define DNS_T_NAPTR 35
#endif
#ifndef DNS_T_A6
#define DNS_T_A6 38
#endif
#ifndef DNS_T_CAA
#define DNS_T_CAA 257
#endif
#ifndef DNS_T_ANY
#define DNS_T_ANY 255
#endif
/* }}} */
static zend_string *php_gethostbyaddr(char *ip);
static zend_string *php_gethostbyname(char *name);
#ifdef HAVE_GETHOSTNAME
/* {{{ Get the host name of the current machine */
PHP_FUNCTION(gethostname)
{
char buf[HOST_NAME_MAX + 1];
ZEND_PARSE_PARAMETERS_NONE();
if (gethostname(buf, sizeof(buf))) {
php_error_docref(NULL, E_WARNING, "Unable to fetch host [%d]: %s", errno, strerror(errno));
RETURN_FALSE;
}
RETURN_STRING(buf);
}
/* }}} */
#endif
/* TODO: Reimplement the gethostby* functions using the new winxp+ API, in dns_win32.c, then
we can have a dns.c, dns_unix.c and dns_win32.c instead of a messy dns.c full of #ifdef
*/
/* {{{ Get the Internet host name corresponding to a given IP address */
PHP_FUNCTION(gethostbyaddr)
{
char *addr;
size_t addr_len;
zend_string *hostname;
ZEND_PARSE_PARAMETERS_START(1, 1)
Z_PARAM_PATH(addr, addr_len)
ZEND_PARSE_PARAMETERS_END();
hostname = php_gethostbyaddr(addr);
if (hostname == NULL) {
#if defined(HAVE_IPV6) && defined(HAVE_INET_PTON)
php_error_docref(NULL, E_WARNING, "Address is not a valid IPv4 or IPv6 address");
#else
php_error_docref(NULL, E_WARNING, "Address is not in a.b.c.d form");
#endif
RETVAL_FALSE;
} else {
RETVAL_STR(hostname);
}
}
/* }}} */
/* {{{ php_gethostbyaddr */
static zend_string *php_gethostbyaddr(char *ip)
{
#if defined(HAVE_IPV6) && defined(HAVE_INET_PTON)
struct sockaddr_in sa4;
struct sockaddr_in6 sa6;
char out[NI_MAXHOST];
memset(&sa4, 0, sizeof(struct sockaddr_in));
memset(&sa6, 0, sizeof(struct sockaddr_in6));
if (inet_pton(AF_INET6, ip, &sa6.sin6_addr)) {
sa6.sin6_family = AF_INET6;
if (getnameinfo((struct sockaddr *)&sa6, sizeof(sa6), out, sizeof(out), NULL, 0, NI_NAMEREQD) != 0) {
return zend_string_init(ip, strlen(ip), 0);
}
return zend_string_init(out, strlen(out), 0);
} else if (inet_pton(AF_INET, ip, &sa4.sin_addr)) {
sa4.sin_family = AF_INET;
if (getnameinfo((struct sockaddr *)&sa4, sizeof(sa4), out, sizeof(out), NULL, 0, NI_NAMEREQD) != 0) {
return zend_string_init(ip, strlen(ip), 0);
}
return zend_string_init(out, strlen(out), 0);
}
return NULL; /* not a valid IP */
#else
struct in_addr addr;
struct hostent *hp;
addr.s_addr = inet_addr(ip);
if (addr.s_addr == -1) {
return NULL;
}
hp = gethostbyaddr((char *) &addr, sizeof(addr), AF_INET);
if (!hp || hp->h_name == NULL || hp->h_name[0] == '\0') {
return zend_string_init(ip, strlen(ip), 0);
}
return zend_string_init(hp->h_name, strlen(hp->h_name), 0);
#endif
}
/* }}} */
/* {{{ Get the IP address corresponding to a given Internet host name */
PHP_FUNCTION(gethostbyname)
{
char *hostname;
size_t hostname_len;
ZEND_PARSE_PARAMETERS_START(1, 1)
Z_PARAM_PATH(hostname, hostname_len)
ZEND_PARSE_PARAMETERS_END();
if (hostname_len > MAXFQDNLEN) {
/* name too long, protect from CVE-2015-0235 */
php_error_docref(NULL, E_WARNING, "Host name cannot be longer than %d characters", MAXFQDNLEN);
RETURN_STRINGL(hostname, hostname_len);
}
RETURN_STR(php_gethostbyname(hostname));
}
/* }}} */
/* {{{ Return a list of IP addresses that a given hostname resolves to. */
PHP_FUNCTION(gethostbynamel)
{
char *hostname;
size_t hostname_len;
struct hostent *hp;
struct in_addr in;
int i;
#ifdef HAVE_INET_NTOP
char addr4[INET_ADDRSTRLEN];
#endif
ZEND_PARSE_PARAMETERS_START(1, 1)
Z_PARAM_PATH(hostname, hostname_len)
ZEND_PARSE_PARAMETERS_END();
if (hostname_len > MAXFQDNLEN) {
/* name too long, protect from CVE-2015-0235 */
php_error_docref(NULL, E_WARNING, "Host name cannot be longer than %d characters", MAXFQDNLEN);
RETURN_FALSE;
}
hp = php_network_gethostbyname(hostname);
if (!hp) {
RETURN_FALSE;
}
array_init(return_value);
for (i = 0;; i++) {
/* On macos h_addr_list entries may be misaligned. */
struct in_addr *h_addr_entry; /* Don't call this h_addr, it's a macro! */
memcpy(&h_addr_entry, &hp->h_addr_list[i], sizeof(struct in_addr *));
if (!h_addr_entry) {
return;
}
in = *h_addr_entry;
#ifdef HAVE_INET_NTOP
add_next_index_string(return_value, inet_ntop(AF_INET, &in, addr4, INET_ADDRSTRLEN));
#else
add_next_index_string(return_value, inet_ntoa(in));
#endif
}
}
/* }}} */
/* {{{ php_gethostbyname */
static zend_string *php_gethostbyname(char *name)
{
struct hostent *hp;
struct in_addr *h_addr_0; /* Don't call this h_addr, it's a macro! */
struct in_addr in;
#ifdef HAVE_INET_NTOP
char addr4[INET_ADDRSTRLEN];
#endif
const char *address;
hp = php_network_gethostbyname(name);
if (!hp) {
return zend_string_init(name, strlen(name), 0);
}
/* On macos h_addr_list entries may be misaligned. */
memcpy(&h_addr_0, &hp->h_addr_list[0], sizeof(struct in_addr *));
if (!h_addr_0) {
return zend_string_init(name, strlen(name), 0);
}
memcpy(&in.s_addr, h_addr_0, sizeof(in.s_addr));
#ifdef HAVE_INET_NTOP
address = inet_ntop(AF_INET, &in, addr4, INET_ADDRSTRLEN);
#else
address = inet_ntoa(in);
#endif
return zend_string_init(address, strlen(address), 0);
}
/* }}} */
/* Note: These functions are defined in ext/standard/dns_win32.c for Windows! */
#if !defined(PHP_WIN32) && defined(HAVE_DNS_SEARCH_FUNC)
#ifndef HFIXEDSZ
#define HFIXEDSZ 12 /* fixed data in header <arpa/nameser.h> */
#endif /* HFIXEDSZ */
#ifndef QFIXEDSZ
#define QFIXEDSZ 4 /* fixed data in query <arpa/nameser.h> */
#endif /* QFIXEDSZ */
#undef MAXHOSTNAMELEN
#define MAXHOSTNAMELEN 1024
#ifndef MAXRESOURCERECORDS
#define MAXRESOURCERECORDS 64
#endif /* MAXRESOURCERECORDS */
typedef union {
HEADER qb1;
uint8_t qb2[65536];
} querybuf;
/* just a hack to free resources allocated by glibc in __res_nsend()
* See also:
* res_thread_freeres() in glibc/resolv/res_init.c
* __libc_res_nsend() in resolv/res_send.c
* */
#if defined(__GLIBC__) && !defined(HAVE_DEPRECATED_DNS_FUNCS)
#define php_dns_free_res(__res__) _php_dns_free_res(__res__)
static void _php_dns_free_res(struct __res_state *res) { /* {{{ */
int ns;
for (ns = 0; ns < MAXNS; ns++) {
if (res->_u._ext.nsaddrs[ns] != NULL) {
free (res->_u._ext.nsaddrs[ns]);
res->_u._ext.nsaddrs[ns] = NULL;
}
}
} /* }}} */
#else
#define php_dns_free_res(__res__)
#endif
/* {{{ Check DNS records corresponding to a given Internet host name or IP address */
PHP_FUNCTION(dns_check_record)
{
HEADER *hp;
querybuf answer = {0};
char *hostname;
size_t hostname_len;
zend_string *rectype = NULL;
int type = DNS_T_MX, i;
#if defined(HAVE_DNS_SEARCH)
struct sockaddr_storage from;
uint32_t fromsize = sizeof(from);
dns_handle_t handle;
#elif defined(HAVE_RES_NSEARCH)
struct __res_state state;
struct __res_state *handle = &state;
#endif
ZEND_PARSE_PARAMETERS_START(1, 2)
Z_PARAM_STRING(hostname, hostname_len)
Z_PARAM_OPTIONAL
Z_PARAM_STR(rectype)
ZEND_PARSE_PARAMETERS_END();
if (hostname_len == 0) {
zend_argument_value_error(1, "cannot be empty");
RETURN_THROWS();
}
if (rectype) {
if (zend_string_equals_literal_ci(rectype, "A")) type = DNS_T_A;
else if (zend_string_equals_literal_ci(rectype, "NS")) type = DNS_T_NS;
else if (zend_string_equals_literal_ci(rectype, "MX")) type = DNS_T_MX;
else if (zend_string_equals_literal_ci(rectype, "PTR")) type = DNS_T_PTR;
else if (zend_string_equals_literal_ci(rectype, "ANY")) type = DNS_T_ANY;
else if (zend_string_equals_literal_ci(rectype, "SOA")) type = DNS_T_SOA;
else if (zend_string_equals_literal_ci(rectype, "CAA")) type = DNS_T_CAA;
else if (zend_string_equals_literal_ci(rectype, "TXT")) type = DNS_T_TXT;
else if (zend_string_equals_literal_ci(rectype, "CNAME")) type = DNS_T_CNAME;
else if (zend_string_equals_literal_ci(rectype, "AAAA")) type = DNS_T_AAAA;
else if (zend_string_equals_literal_ci(rectype, "SRV")) type = DNS_T_SRV;
else if (zend_string_equals_literal_ci(rectype, "NAPTR")) type = DNS_T_NAPTR;
else if (zend_string_equals_literal_ci(rectype, "A6")) type = DNS_T_A6;
else {
zend_argument_value_error(2, "must be a valid DNS record type");
RETURN_THROWS();
}
}
#if defined(HAVE_DNS_SEARCH)
handle = dns_open(NULL);
if (handle == NULL) {
RETURN_FALSE;
}
#elif defined(HAVE_RES_NSEARCH)
memset(&state, 0, sizeof(state));
if (res_ninit(handle)) {
RETURN_FALSE;
}
#else
res_init();
#endif
i = php_dns_search(handle, hostname, C_IN, type, answer.qb2, sizeof answer);
php_dns_free_handle(handle);
if (i < 0) {
RETURN_FALSE;
}
hp = (HEADER *)&answer;
RETURN_BOOL(ntohs(hp->ancount) != 0);
}
/* }}} */
#ifdef HAVE_FULL_DNS_FUNCS
#define CHECKCP(n) do { \
if (cp + n > end) { \
return NULL; \
} \
} while (0)
/* {{{ php_parserr */
static uint8_t *php_parserr(uint8_t *cp, uint8_t *end, querybuf *answer, int type_to_fetch, int store, bool raw, zval *subarray)
{
u_short type, class, dlen;
u_long ttl;
long n, i;
u_short s;
uint8_t *tp, *p;
char name[MAXHOSTNAMELEN] = {0};
int have_v6_break = 0, in_v6_break = 0;
ZVAL_UNDEF(subarray);
n = dn_expand(answer->qb2, end, cp, name, sizeof(name) - 2);
if (n < 0) {
return NULL;
}
cp += n;
CHECKCP(10);
GETSHORT(type, cp);
GETSHORT(class, cp);
GETLONG(ttl, cp);
GETSHORT(dlen, cp);
CHECKCP(dlen);
if (dlen == 0) {
/* No data in the response - nothing to do */
return NULL;
}
if (type_to_fetch != DNS_T_ANY && type != type_to_fetch) {
cp += dlen;
return cp;
}
if (!store) {
cp += dlen;
return cp;
}
array_init(subarray);
add_assoc_string(subarray, "host", name);
add_assoc_string(subarray, "class", "IN");
add_assoc_long(subarray, "ttl", ttl);
(void) class;
if (raw) {
add_assoc_long(subarray, "type", type);
add_assoc_stringl(subarray, "data", (char*) cp, (uint32_t) dlen);
cp += dlen;
return cp;
}
switch (type) {
case DNS_T_A:
CHECKCP(4);
add_assoc_string(subarray, "type", "A");
snprintf(name, sizeof(name), "%d.%d.%d.%d", cp[0], cp[1], cp[2], cp[3]);
add_assoc_string(subarray, "ip", name);
cp += dlen;
break;
case DNS_T_MX:
CHECKCP(2);
add_assoc_string(subarray, "type", "MX");
GETSHORT(n, cp);
add_assoc_long(subarray, "pri", n);
ZEND_FALLTHROUGH;
case DNS_T_CNAME:
if (type == DNS_T_CNAME) {
add_assoc_string(subarray, "type", "CNAME");
}
ZEND_FALLTHROUGH;
case DNS_T_NS:
if (type == DNS_T_NS) {
add_assoc_string(subarray, "type", "NS");
}
ZEND_FALLTHROUGH;
case DNS_T_PTR:
if (type == DNS_T_PTR) {
add_assoc_string(subarray, "type", "PTR");
}
n = dn_expand(answer->qb2, end, cp, name, (sizeof name) - 2);
if (n < 0) {
return NULL;
}
cp += n;
add_assoc_string(subarray, "target", name);
break;
case DNS_T_HINFO:
/* See RFC 1010 for values */
add_assoc_string(subarray, "type", "HINFO");
CHECKCP(1);
n = *cp & 0xFF;
cp++;
CHECKCP(n);
add_assoc_stringl(subarray, "cpu", (char*)cp, n);
cp += n;
CHECKCP(1);
n = *cp & 0xFF;
cp++;
CHECKCP(n);
add_assoc_stringl(subarray, "os", (char*)cp, n);
cp += n;
break;
case DNS_T_CAA:
/* See RFC 6844 for values https://tools.ietf.org/html/rfc6844 */
add_assoc_string(subarray, "type", "CAA");
// 1 flag byte
CHECKCP(1);
n = *cp & 0xFF;
add_assoc_long(subarray, "flags", n);
cp++;
// Tag length (1 byte)
CHECKCP(1);
n = *cp & 0xFF;
cp++;
CHECKCP(n);
add_assoc_stringl(subarray, "tag", (char*)cp, n);
cp += n;
if ( (size_t) dlen < ((size_t)n) + 2 ) {
return NULL;
}
n = dlen - n - 2;
CHECKCP(n);
add_assoc_stringl(subarray, "value", (char*)cp, n);
cp += n;
break;
case DNS_T_TXT:
{
int l1 = 0, l2 = 0;
zval entries;
zend_string *tp;
add_assoc_string(subarray, "type", "TXT");
tp = zend_string_alloc(dlen, 0);
array_init(&entries);
while (l1 < dlen) {
n = cp[l1];
if ((l1 + n) >= dlen) {
// Invalid chunk length, truncate
n = dlen - (l1 + 1);
}
if (n) {
memcpy(ZSTR_VAL(tp) + l2 , cp + l1 + 1, n);
add_next_index_stringl(&entries, (char *) cp + l1 + 1, n);
}
l1 = l1 + n + 1;
l2 = l2 + n;
}
ZSTR_VAL(tp)[l2] = '\0';
ZSTR_LEN(tp) = l2;
cp += dlen;
add_assoc_str(subarray, "txt", tp);
add_assoc_zval(subarray, "entries", &entries);
}
break;
case DNS_T_SOA:
add_assoc_string(subarray, "type", "SOA");
n = dn_expand(answer->qb2, end, cp, name, (sizeof name) -2);
if (n < 0) {
return NULL;
}
cp += n;
add_assoc_string(subarray, "mname", name);
n = dn_expand(answer->qb2, end, cp, name, (sizeof name) -2);
if (n < 0) {
return NULL;
}
cp += n;
add_assoc_string(subarray, "rname", name);
CHECKCP(5*4);
GETLONG(n, cp);
add_assoc_long(subarray, "serial", n);
GETLONG(n, cp);
add_assoc_long(subarray, "refresh", n);
GETLONG(n, cp);
add_assoc_long(subarray, "retry", n);
GETLONG(n, cp);
add_assoc_long(subarray, "expire", n);
GETLONG(n, cp);
add_assoc_long(subarray, "minimum-ttl", n);
break;
case DNS_T_AAAA:
tp = (uint8_t*)name;
CHECKCP(8*2);
for(i=0; i < 8; i++) {
GETSHORT(s, cp);
if (s != 0) {
if (tp > (uint8_t *)name) {
in_v6_break = 0;
tp[0] = ':';
tp++;
}
tp += sprintf((char*)tp,"%x",s);
} else {
if (!have_v6_break) {
have_v6_break = 1;
in_v6_break = 1;
tp[0] = ':';
tp++;
} else if (!in_v6_break) {
tp[0] = ':';
tp++;
tp[0] = '0';
tp++;
}
}
}
if (have_v6_break && in_v6_break) {
tp[0] = ':';
tp++;
}
tp[0] = '\0';
add_assoc_string(subarray, "type", "AAAA");
add_assoc_string(subarray, "ipv6", name);
break;
case DNS_T_A6:
p = cp;
add_assoc_string(subarray, "type", "A6");
CHECKCP(1);
n = ((int)cp[0]) & 0xFF;
cp++;
add_assoc_long(subarray, "masklen", n);
tp = (uint8_t*)name;
if (n > 15) {
have_v6_break = 1;
in_v6_break = 1;
tp[0] = ':';
tp++;
}
if (n % 16 > 8) {
/* Partial short */
if (cp[0] != 0) {
if (tp > (uint8_t *)name) {
in_v6_break = 0;
tp[0] = ':';
tp++;
}
sprintf((char*)tp, "%x", cp[0] & 0xFF);
} else {
if (!have_v6_break) {
have_v6_break = 1;
in_v6_break = 1;
tp[0] = ':';
tp++;
} else if (!in_v6_break) {
tp[0] = ':';
tp++;
tp[0] = '0';
tp++;
}
}
cp++;
}
for (i = (n + 8) / 16; i < 8; i++) {
CHECKCP(2);
GETSHORT(s, cp);
if (s != 0) {
if (tp > (uint8_t *)name) {
in_v6_break = 0;
tp[0] = ':';
tp++;
}
tp += sprintf((char*)tp,"%x",s);
} else {
if (!have_v6_break) {
have_v6_break = 1;
in_v6_break = 1;
tp[0] = ':';
tp++;
} else if (!in_v6_break) {
tp[0] = ':';
tp++;
tp[0] = '0';
tp++;
}
}
}
if (have_v6_break && in_v6_break) {
tp[0] = ':';
tp++;
}
tp[0] = '\0';
add_assoc_string(subarray, "ipv6", name);
if (cp < p + dlen) {
n = dn_expand(answer->qb2, end, cp, name, (sizeof name) - 2);
if (n < 0) {
return NULL;
}
cp += n;
add_assoc_string(subarray, "chain", name);
}
break;
case DNS_T_SRV:
CHECKCP(3*2);
add_assoc_string(subarray, "type", "SRV");
GETSHORT(n, cp);
add_assoc_long(subarray, "pri", n);
GETSHORT(n, cp);
add_assoc_long(subarray, "weight", n);
GETSHORT(n, cp);
add_assoc_long(subarray, "port", n);
n = dn_expand(answer->qb2, end, cp, name, (sizeof name) - 2);
if (n < 0) {
return NULL;
}
cp += n;
add_assoc_string(subarray, "target", name);
break;
case DNS_T_NAPTR:
CHECKCP(2*2);
add_assoc_string(subarray, "type", "NAPTR");
GETSHORT(n, cp);
add_assoc_long(subarray, "order", n);
GETSHORT(n, cp);
add_assoc_long(subarray, "pref", n);
CHECKCP(1);
n = (cp[0] & 0xFF);
cp++;
CHECKCP(n);
add_assoc_stringl(subarray, "flags", (char*)cp, n);
cp += n;
CHECKCP(1);
n = (cp[0] & 0xFF);
cp++;
CHECKCP(n);
add_assoc_stringl(subarray, "services", (char*)cp, n);
cp += n;
CHECKCP(1);
n = (cp[0] & 0xFF);
cp++;
CHECKCP(n);
add_assoc_stringl(subarray, "regex", (char*)cp, n);
cp += n;
n = dn_expand(answer->qb2, end, cp, name, (sizeof name) - 2);
if (n < 0) {
return NULL;
}
cp += n;
add_assoc_string(subarray, "replacement", name);
break;
default:
zval_ptr_dtor(subarray);
ZVAL_UNDEF(subarray);
cp += dlen;
break;
}
return cp;
}
/* }}} */
/* {{{ Get any Resource Record corresponding to a given Internet host name */
PHP_FUNCTION(dns_get_record)
{
char *hostname;
size_t hostname_len;
zend_long type_param = PHP_DNS_ANY;
zval *authns = NULL, *addtl = NULL;
int type_to_fetch;
int dns_errno;
#if defined(HAVE_DNS_SEARCH)
struct sockaddr_storage from;
uint32_t fromsize = sizeof(from);
dns_handle_t handle;
#elif defined(HAVE_RES_NSEARCH)
struct __res_state state;
struct __res_state *handle = &state;
#endif
HEADER *hp;
querybuf answer = {0};
uint8_t *cp = NULL, *end = NULL;
int n, qd, an, ns = 0, ar = 0;
int type, first_query = 1, store_results = 1;
bool raw = 0;
ZEND_PARSE_PARAMETERS_START(1, 5)
Z_PARAM_STRING(hostname, hostname_len)
Z_PARAM_OPTIONAL
Z_PARAM_LONG(type_param)
Z_PARAM_ZVAL(authns)
Z_PARAM_ZVAL(addtl)
Z_PARAM_BOOL(raw)
ZEND_PARSE_PARAMETERS_END();
if (authns) {
authns = zend_try_array_init(authns);
if (!authns) {
RETURN_THROWS();
}
}
if (addtl) {
addtl = zend_try_array_init(addtl);
if (!addtl) {
RETURN_THROWS();
}
}
if (!raw) {
if ((type_param & ~PHP_DNS_ALL) && (type_param != PHP_DNS_ANY)) {
zend_argument_value_error(2, "must be a DNS_* constant");
RETURN_THROWS();
}
} else {
if ((type_param < 1) || (type_param > 0xFFFF)) {
zend_argument_value_error(2, "must be between 1 and 65535 when argument #5 ($raw) is true");
RETURN_THROWS();
}
}
/* Initialize the return array */
array_init(return_value);
/* - We emulate an or'ed type mask by querying type by type. (Steps 0 - NUMTYPES-1 )
* If additional info is wanted we check again with DNS_T_ANY (step NUMTYPES / NUMTYPES+1 )
* store_results is used to skip storing the results retrieved in step
* NUMTYPES+1 when results were already fetched.
* - In case of PHP_DNS_ANY we use the directly fetch DNS_T_ANY. (step NUMTYPES+1 )
* - In case of raw mode, we query only the requested type instead of looping type by type
* before going with the additional info stuff.
*/
if (raw) {
type = -1;
} else if (type_param == PHP_DNS_ANY) {
type = PHP_DNS_NUM_TYPES + 1;
} else {
type = 0;
}
for ( ;
type < (addtl ? (PHP_DNS_NUM_TYPES + 2) : PHP_DNS_NUM_TYPES) || first_query;
type++
) {
first_query = 0;
switch (type) {
case -1: /* raw */
type_to_fetch = type_param;
/* skip over the rest and go directly to additional records */
type = PHP_DNS_NUM_TYPES - 1;
break;
case 0:
type_to_fetch = type_param&PHP_DNS_A ? DNS_T_A : 0;
break;
case 1:
type_to_fetch = type_param&PHP_DNS_NS ? DNS_T_NS : 0;
break;
case 2:
type_to_fetch = type_param&PHP_DNS_CNAME ? DNS_T_CNAME : 0;
break;
case 3:
type_to_fetch = type_param&PHP_DNS_SOA ? DNS_T_SOA : 0;
break;
case 4:
type_to_fetch = type_param&PHP_DNS_PTR ? DNS_T_PTR : 0;
break;
case 5:
type_to_fetch = type_param&PHP_DNS_HINFO ? DNS_T_HINFO : 0;
break;
case 6:
type_to_fetch = type_param&PHP_DNS_MX ? DNS_T_MX : 0;
break;
case 7:
type_to_fetch = type_param&PHP_DNS_TXT ? DNS_T_TXT : 0;
break;
case 8:
type_to_fetch = type_param&PHP_DNS_AAAA ? DNS_T_AAAA : 0;
break;
case 9:
type_to_fetch = type_param&PHP_DNS_SRV ? DNS_T_SRV : 0;
break;
case 10:
type_to_fetch = type_param&PHP_DNS_NAPTR ? DNS_T_NAPTR : 0;
break;
case 11:
type_to_fetch = type_param&PHP_DNS_A6 ? DNS_T_A6 : 0;
break;
case 12:
type_to_fetch = type_param&PHP_DNS_CAA ? DNS_T_CAA : 0;
break;
case PHP_DNS_NUM_TYPES:
store_results = 0;
continue;
default:
case (PHP_DNS_NUM_TYPES + 1):
type_to_fetch = DNS_T_ANY;
break;
}
if (type_to_fetch) {
#if defined(HAVE_DNS_SEARCH)
handle = dns_open(NULL);
if (handle == NULL) {
zend_array_destroy(Z_ARR_P(return_value));
RETURN_FALSE;
}
#elif defined(HAVE_RES_NSEARCH)
memset(&state, 0, sizeof(state));
if (res_ninit(handle)) {
zend_array_destroy(Z_ARR_P(return_value));
RETURN_FALSE;
}
#else
res_init();
#endif
n = php_dns_search(handle, hostname, C_IN, type_to_fetch, answer.qb2, sizeof answer);
if (n < 0) {
dns_errno = php_dns_errno(handle);
php_dns_free_handle(handle);
switch (dns_errno) {
case NO_DATA:
case HOST_NOT_FOUND:
continue;
case NO_RECOVERY:
php_error_docref(NULL, E_WARNING, "An unexpected server failure occurred.");
break;
case TRY_AGAIN:
php_error_docref(NULL, E_WARNING, "A temporary server error occurred.");
break;
default:
php_error_docref(NULL, E_WARNING, "DNS Query failed");
}
zend_array_destroy(Z_ARR_P(return_value));
RETURN_FALSE;
}
cp = answer.qb2 + HFIXEDSZ;
end = answer.qb2 + n;
hp = (HEADER *)&answer;
qd = ntohs(hp->qdcount);
an = ntohs(hp->ancount);
ns = ntohs(hp->nscount);
ar = ntohs(hp->arcount);
/* Skip QD entries, they're only used by dn_expand later on */
while (qd-- > 0) {
n = dn_skipname(cp, end);
if (n < 0) {
php_error_docref(NULL, E_WARNING, "Unable to parse DNS data received");
zend_array_destroy(Z_ARR_P(return_value));
php_dns_free_handle(handle);
RETURN_FALSE;
}
cp += n + QFIXEDSZ;