version 1.1.1.3, 2016/11/02 09:57:01
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version 1.1.1.4, 2021/03/17 00:56:46
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/* dnsmasq is Copyright (c) 2000-2016 Simon Kelley | /* dnsmasq is Copyright (c) 2000-2021 Simon Kelley |
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This program is free software; you can redistribute it and/or modify |
This program is free software; you can redistribute it and/or modify |
it under the terms of the GNU General Public License as published by |
it under the terms of the GNU General Public License as published by |
Line 36 int extract_name(struct dns_header *header, size_t ple
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Line 36 int extract_name(struct dns_header *header, size_t ple
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if ((l = *p++) == 0) |
if ((l = *p++) == 0) |
/* end marker */ |
/* end marker */ |
{ |
{ |
/* check that there are the correct no of bytes after the name */ | /* check that there are the correct no. of bytes after the name */ |
if (!CHECK_LEN(header, p, plen, extrabytes)) | if (!CHECK_LEN(header, p1 ? p1 : p, plen, extrabytes)) |
return 0; |
return 0; |
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if (isExtract) |
if (isExtract) |
Line 143 int extract_name(struct dns_header *header, size_t ple
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Line 143 int extract_name(struct dns_header *header, size_t ple
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/* Max size of input string (for IPv6) is 75 chars.) */ |
/* Max size of input string (for IPv6) is 75 chars.) */ |
#define MAXARPANAME 75 |
#define MAXARPANAME 75 |
int in_arpa_name_2_addr(char *namein, struct all_addr *addrp) | int in_arpa_name_2_addr(char *namein, union all_addr *addrp) |
{ |
{ |
int j; |
int j; |
char name[MAXARPANAME+1], *cp1; |
char name[MAXARPANAME+1], *cp1; |
Line 153 int in_arpa_name_2_addr(char *namein, struct all_addr
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Line 153 int in_arpa_name_2_addr(char *namein, struct all_addr
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if (strlen(namein) > MAXARPANAME) |
if (strlen(namein) > MAXARPANAME) |
return 0; |
return 0; |
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memset(addrp, 0, sizeof(struct all_addr)); | memset(addrp, 0, sizeof(union all_addr)); |
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/* turn name into a series of asciiz strings */ |
/* turn name into a series of asciiz strings */ |
/* j counts no of labels */ | /* j counts no. of labels */ |
for(j = 1,cp1 = name; *namein; cp1++, namein++) |
for(j = 1,cp1 = name; *namein; cp1++, namein++) |
if (*namein == '.') |
if (*namein == '.') |
{ |
{ |
Line 176 int in_arpa_name_2_addr(char *namein, struct all_addr
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Line 176 int in_arpa_name_2_addr(char *namein, struct all_addr
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if (hostname_isequal(lastchunk, "arpa") && hostname_isequal(penchunk, "in-addr")) |
if (hostname_isequal(lastchunk, "arpa") && hostname_isequal(penchunk, "in-addr")) |
{ |
{ |
/* IP v4 */ |
/* IP v4 */ |
/* address arives as a name of the form | /* address arrives as a name of the form |
www.xxx.yyy.zzz.in-addr.arpa |
www.xxx.yyy.zzz.in-addr.arpa |
some of the low order address octets might be missing |
some of the low order address octets might be missing |
and should be set to zero. */ |
and should be set to zero. */ |
Line 198 int in_arpa_name_2_addr(char *namein, struct all_addr
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Line 198 int in_arpa_name_2_addr(char *namein, struct all_addr
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return F_IPV4; |
return F_IPV4; |
} |
} |
#ifdef HAVE_IPV6 |
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else if (hostname_isequal(penchunk, "ip6") && |
else if (hostname_isequal(penchunk, "ip6") && |
(hostname_isequal(lastchunk, "int") || hostname_isequal(lastchunk, "arpa"))) |
(hostname_isequal(lastchunk, "int") || hostname_isequal(lastchunk, "arpa"))) |
{ |
{ |
Line 206 int in_arpa_name_2_addr(char *namein, struct all_addr
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Line 205 int in_arpa_name_2_addr(char *namein, struct all_addr
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Address arrives as 0.1.2.3.4.5.6.7.8.9.a.b.c.d.e.f.ip6.[int|arpa] |
Address arrives as 0.1.2.3.4.5.6.7.8.9.a.b.c.d.e.f.ip6.[int|arpa] |
or \[xfedcba9876543210fedcba9876543210/128].ip6.[int|arpa] |
or \[xfedcba9876543210fedcba9876543210/128].ip6.[int|arpa] |
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Note that most of these the various reprentations are obsolete and | Note that most of these the various representations are obsolete and |
left-over from the many DNS-for-IPv6 wars. We support all the formats |
left-over from the many DNS-for-IPv6 wars. We support all the formats |
that we can since there is no reason not to. |
that we can since there is no reason not to. |
*/ |
*/ |
Line 235 int in_arpa_name_2_addr(char *namein, struct all_addr
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Line 234 int in_arpa_name_2_addr(char *namein, struct all_addr
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if (*(cp1+1) || !isxdigit((unsigned char)*cp1)) |
if (*(cp1+1) || !isxdigit((unsigned char)*cp1)) |
return 0; |
return 0; |
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for (j = sizeof(struct all_addr)-1; j>0; j--) | for (j = sizeof(struct in6_addr)-1; j>0; j--) |
addr[j] = (addr[j] >> 4) | (addr[j-1] << 4); |
addr[j] = (addr[j] >> 4) | (addr[j-1] << 4); |
addr[0] = (addr[0] >> 4) | (strtol(cp1, NULL, 16) << 4); |
addr[0] = (addr[0] >> 4) | (strtol(cp1, NULL, 16) << 4); |
} |
} |
Line 243 int in_arpa_name_2_addr(char *namein, struct all_addr
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Line 242 int in_arpa_name_2_addr(char *namein, struct all_addr
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return F_IPV6; |
return F_IPV6; |
} |
} |
} |
} |
#endif |
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return 0; |
return 0; |
} |
} |
Line 335 unsigned char *skip_section(unsigned char *ansp, int c
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Line 333 unsigned char *skip_section(unsigned char *ansp, int c
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return ansp; |
return ansp; |
} |
} |
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/* CRC the question section. This is used to safely detect query |
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retransmision and to detect answers to questions we didn't ask, which |
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might be poisoning attacks. Note that we decode the name rather |
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than CRC the raw bytes, since replies might be compressed differently. |
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We ignore case in the names for the same reason. Return all-ones |
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if there is not question section. */ |
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#ifndef HAVE_DNSSEC |
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unsigned int questions_crc(struct dns_header *header, size_t plen, char *name) |
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{ |
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int q; |
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unsigned int crc = 0xffffffff; |
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unsigned char *p1, *p = (unsigned char *)(header+1); |
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for (q = ntohs(header->qdcount); q != 0; q--) |
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{ |
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if (!extract_name(header, plen, &p, name, 1, 4)) |
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return crc; /* bad packet */ |
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for (p1 = (unsigned char *)name; *p1; p1++) |
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{ |
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int i = 8; |
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char c = *p1; |
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if (c >= 'A' && c <= 'Z') |
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c += 'a' - 'A'; |
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crc ^= c << 24; |
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while (i--) |
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crc = crc & 0x80000000 ? (crc << 1) ^ 0x04c11db7 : crc << 1; |
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} |
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/* CRC the class and type as well */ |
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for (p1 = p; p1 < p+4; p1++) |
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{ |
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int i = 8; |
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crc ^= *p1 << 24; |
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while (i--) |
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crc = crc & 0x80000000 ? (crc << 1) ^ 0x04c11db7 : crc << 1; |
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} |
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p += 4; |
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if (!CHECK_LEN(header, p, plen, 0)) |
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return crc; /* bad packet */ |
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} |
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return crc; |
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} |
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#endif |
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size_t resize_packet(struct dns_header *header, size_t plen, unsigned char *pheader, size_t hlen) |
size_t resize_packet(struct dns_header *header, size_t plen, unsigned char *pheader, size_t hlen) |
{ |
{ |
unsigned char *ansp = skip_questions(header, plen); |
unsigned char *ansp = skip_questions(header, plen); |
Line 426 int private_net(struct in_addr addr, int ban_localhost
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Line 375 int private_net(struct in_addr addr, int ban_localhost
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((ip_addr & 0xFFFFFFFF) == 0xFFFFFFFF) /* 255.255.255.255/32 (broadcast)*/ ; |
((ip_addr & 0xFFFFFFFF) == 0xFFFFFFFF) /* 255.255.255.255/32 (broadcast)*/ ; |
} |
} |
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static int private_net6(struct in6_addr *a) |
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{ |
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return |
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IN6_IS_ADDR_UNSPECIFIED(a) || /* RFC 6303 4.3 */ |
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IN6_IS_ADDR_LOOPBACK(a) || /* RFC 6303 4.3 */ |
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IN6_IS_ADDR_LINKLOCAL(a) || /* RFC 6303 4.5 */ |
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((unsigned char *)a)[0] == 0xfd || /* RFC 6303 4.4 */ |
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((u32 *)a)[0] == htonl(0x20010db8); /* RFC 6303 4.6 */ |
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} |
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static unsigned char *do_doctor(unsigned char *p, int count, struct dns_header *header, size_t qlen, char *name, int *doctored) |
static unsigned char *do_doctor(unsigned char *p, int count, struct dns_header *header, size_t qlen, char *name, int *doctored) |
{ |
{ |
int i, qtype, qclass, rdlen; |
int i, qtype, qclass, rdlen; |
Line 485 static unsigned char *do_doctor(unsigned char *p, int
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Line 444 static unsigned char *do_doctor(unsigned char *p, int
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{ |
{ |
unsigned int i, len = *p1; |
unsigned int i, len = *p1; |
unsigned char *p2 = p1; |
unsigned char *p2 = p1; |
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if ((p1 + len - p) >= rdlen) |
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return 0; /* bad packet */ |
/* make counted string zero-term and sanitise */ |
/* make counted string zero-term and sanitise */ |
for (i = 0; i < len; i++) |
for (i = 0; i < len; i++) |
{ |
{ |
Line 569 static int find_soa(struct dns_header *header, size_t
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Line 530 static int find_soa(struct dns_header *header, size_t
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expired and cleaned out that way. |
expired and cleaned out that way. |
Return 1 if we reject an address because it look like part of dns-rebinding attack. */ |
Return 1 if we reject an address because it look like part of dns-rebinding attack. */ |
int extract_addresses(struct dns_header *header, size_t qlen, char *name, time_t now, |
int extract_addresses(struct dns_header *header, size_t qlen, char *name, time_t now, |
char **ipsets, int is_sign, int check_rebind, int no_cache_dnssec, int secure, int *doctored) | char **ipsets, int is_sign, int check_rebind, int no_cache_dnssec, |
| int secure, int *doctored) |
{ |
{ |
unsigned char *p, *p1, *endrr, *namep; |
unsigned char *p, *p1, *endrr, *namep; |
int i, j, qtype, qclass, aqtype, aqclass, ardlen, res, searched_soa = 0; |
int i, j, qtype, qclass, aqtype, aqclass, ardlen, res, searched_soa = 0; |
unsigned long ttl = 0; |
unsigned long ttl = 0; |
struct all_addr addr; | union all_addr addr; |
#ifdef HAVE_IPSET |
#ifdef HAVE_IPSET |
char **ipsets_cur; |
char **ipsets_cur; |
#else |
#else |
(void)ipsets; /* unused */ |
(void)ipsets; /* unused */ |
#endif |
#endif |
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cache_start_insert(); |
cache_start_insert(); |
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Line 588 int extract_addresses(struct dns_header *header, size_
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Line 551 int extract_addresses(struct dns_header *header, size_
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{ |
{ |
searched_soa = 1; |
searched_soa = 1; |
ttl = find_soa(header, qlen, name, doctored); |
ttl = find_soa(header, qlen, name, doctored); |
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if (*doctored) |
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{ |
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if (secure) |
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return 0; |
#ifdef HAVE_DNSSEC |
#ifdef HAVE_DNSSEC |
if (*doctored && secure) | if (option_bool(OPT_DNSSEC_VALID)) |
return 0; | for (i = 0; i < ntohs(header->ancount); i++) |
| if (daemon->rr_status[i] != 0) |
| return 0; |
#endif |
#endif |
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} |
} |
} |
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/* go through the questions. */ |
/* go through the questions. */ |
Line 602 int extract_addresses(struct dns_header *header, size_
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Line 573 int extract_addresses(struct dns_header *header, size_
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int found = 0, cname_count = CNAME_CHAIN; |
int found = 0, cname_count = CNAME_CHAIN; |
struct crec *cpp = NULL; |
struct crec *cpp = NULL; |
int flags = RCODE(header) == NXDOMAIN ? F_NXDOMAIN : 0; |
int flags = RCODE(header) == NXDOMAIN ? F_NXDOMAIN : 0; |
int secflag = secure ? F_DNSSECOK : 0; | #ifdef HAVE_DNSSEC |
| int cname_short = 0; |
| #endif |
unsigned long cttl = ULONG_MAX, attl; |
unsigned long cttl = ULONG_MAX, attl; |
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namep = p; |
namep = p; |
Line 630 int extract_addresses(struct dns_header *header, size_
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Line 603 int extract_addresses(struct dns_header *header, size_
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if (!(p1 = skip_questions(header, qlen))) |
if (!(p1 = skip_questions(header, qlen))) |
return 0; |
return 0; |
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for (j = ntohs(header->ancount); j != 0; j--) | for (j = 0; j < ntohs(header->ancount); j++) |
{ |
{ |
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int secflag = 0; |
unsigned char *tmp = namep; |
unsigned char *tmp = namep; |
/* the loop body overwrites the original name, so get it back here. */ |
/* the loop body overwrites the original name, so get it back here. */ |
if (!extract_name(header, qlen, &tmp, name, 1, 0) || |
if (!extract_name(header, qlen, &tmp, name, 1, 0) || |
Line 657 int extract_addresses(struct dns_header *header, size_
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Line 631 int extract_addresses(struct dns_header *header, size_
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{ |
{ |
if (!extract_name(header, qlen, &p1, name, 1, 0)) |
if (!extract_name(header, qlen, &p1, name, 1, 0)) |
return 0; |
return 0; |
| #ifdef HAVE_DNSSEC |
| if (option_bool(OPT_DNSSEC_VALID) && daemon->rr_status[j] != 0) |
| { |
| /* validated RR anywhere in CNAME chain, don't cache. */ |
| if (cname_short || aqtype == T_CNAME) |
| return 0; |
| |
| secflag = F_DNSSECOK; |
| /* limit TTL based on signature. */ |
| if (daemon->rr_status[j] < cttl) |
| cttl = daemon->rr_status[j]; |
| } |
| #endif |
| |
if (aqtype == T_CNAME) |
if (aqtype == T_CNAME) |
{ |
{ |
if (!cname_count-- || secure) | if (!cname_count--) |
return 0; /* looped CNAMES, or DNSSEC, which we can't cache. */ | return 0; /* looped CNAMES, we can't cache. */ |
| #ifdef HAVE_DNSSEC |
| cname_short = 1; |
| #endif |
goto cname_loop; |
goto cname_loop; |
} |
} |
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cache_insert(name, &addr, now, cttl, name_encoding | secflag | F_REVERSE); | cache_insert(name, &addr, C_IN, now, cttl, name_encoding | secflag | F_REVERSE); |
found = 1; |
found = 1; |
} |
} |
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Line 683 int extract_addresses(struct dns_header *header, size_
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Line 673 int extract_addresses(struct dns_header *header, size_
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ttl = find_soa(header, qlen, NULL, doctored); |
ttl = find_soa(header, qlen, NULL, doctored); |
} |
} |
if (ttl) |
if (ttl) |
cache_insert(NULL, &addr, now, ttl, name_encoding | F_REVERSE | F_NEG | flags | secflag); | cache_insert(NULL, &addr, C_IN, now, ttl, name_encoding | F_REVERSE | F_NEG | flags | (secure ? F_DNSSECOK : 0)); |
} |
} |
} |
} |
else |
else |
{ |
{ |
/* everything other than PTR */ |
/* everything other than PTR */ |
struct crec *newc; |
struct crec *newc; |
int addrlen; | int addrlen = 0; |
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if (qtype == T_A) |
if (qtype == T_A) |
{ |
{ |
addrlen = INADDRSZ; |
addrlen = INADDRSZ; |
flags |= F_IPV4; |
flags |= F_IPV4; |
} |
} |
#ifdef HAVE_IPV6 |
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else if (qtype == T_AAAA) |
else if (qtype == T_AAAA) |
{ |
{ |
addrlen = IN6ADDRSZ; |
addrlen = IN6ADDRSZ; |
flags |= F_IPV6; |
flags |= F_IPV6; |
} |
} |
#endif | else if (qtype == T_SRV) |
else | flags |= F_SRV; |
| else |
continue; |
continue; |
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cname_loop1: |
cname_loop1: |
if (!(p1 = skip_questions(header, qlen))) |
if (!(p1 = skip_questions(header, qlen))) |
return 0; |
return 0; |
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for (j = ntohs(header->ancount); j != 0; j--) | for (j = 0; j < ntohs(header->ancount); j++) |
{ |
{ |
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int secflag = 0; |
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if (!(res = extract_name(header, qlen, &p1, name, 0, 10))) |
if (!(res = extract_name(header, qlen, &p1, name, 0, 10))) |
return 0; /* bad packet */ |
return 0; /* bad packet */ |
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Line 729 int extract_addresses(struct dns_header *header, size_
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Line 721 int extract_addresses(struct dns_header *header, size_
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if (aqclass == C_IN && res != 2 && (aqtype == T_CNAME || aqtype == qtype)) |
if (aqclass == C_IN && res != 2 && (aqtype == T_CNAME || aqtype == qtype)) |
{ |
{ |
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#ifdef HAVE_DNSSEC |
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if (option_bool(OPT_DNSSEC_VALID) && daemon->rr_status[j] != 0) |
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{ |
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secflag = F_DNSSECOK; |
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/* limit TTl based on sig. */ |
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if (daemon->rr_status[j] < attl) |
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attl = daemon->rr_status[j]; |
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} |
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#endif |
if (aqtype == T_CNAME) |
if (aqtype == T_CNAME) |
{ |
{ |
if (!cname_count--) |
if (!cname_count--) |
return 0; /* looped CNAMES */ |
return 0; /* looped CNAMES */ |
newc = cache_insert(name, NULL, now, attl, F_CNAME | F_FORWARD | secflag); | |
if (newc) | if ((newc = cache_insert(name, NULL, C_IN, now, attl, F_CNAME | F_FORWARD | secflag))) |
{ |
{ |
newc->addr.cname.target.cache = NULL; |
newc->addr.cname.target.cache = NULL; |
/* anything other than zero, to avoid being mistaken for CNAME to interface-name */ | newc->addr.cname.is_name_ptr = 0; |
newc->addr.cname.uid = 1; | |
if (cpp) |
if (cpp) |
{ |
{ |
|
next_uid(newc); |
cpp->addr.cname.target.cache = newc; |
cpp->addr.cname.target.cache = newc; |
cpp->addr.cname.uid = newc->uid; |
cpp->addr.cname.uid = newc->uid; |
} |
} |
Line 750 int extract_addresses(struct dns_header *header, size_
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Line 752 int extract_addresses(struct dns_header *header, size_
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if (attl < cttl) |
if (attl < cttl) |
cttl = attl; |
cttl = attl; |
|
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namep = p1; |
if (!extract_name(header, qlen, &p1, name, 1, 0)) |
if (!extract_name(header, qlen, &p1, name, 1, 0)) |
return 0; |
return 0; |
|
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goto cname_loop1; |
goto cname_loop1; |
} |
} |
else if (!(flags & F_NXDOMAIN)) |
else if (!(flags & F_NXDOMAIN)) |
{ |
{ |
found = 1; |
found = 1; |
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/* copy address into aligned storage */ | if (flags & F_SRV) |
if (!CHECK_LEN(header, p1, qlen, addrlen)) | |
return 0; /* bad packet */ | |
memcpy(&addr, p1, addrlen); | |
| |
/* check for returned address in private space */ | |
if (check_rebind) | |
{ |
{ |
if ((flags & F_IPV4) && | unsigned char *tmp = namep; |
private_net(addr.addr.addr4, !option_bool(OPT_LOCAL_REBIND))) | |
return 1; | if (!CHECK_LEN(header, p1, qlen, 6)) |
| return 0; /* bad packet */ |
#ifdef HAVE_IPV6 | GETSHORT(addr.srv.priority, p1); |
if ((flags & F_IPV6) && | GETSHORT(addr.srv.weight, p1); |
IN6_IS_ADDR_V4MAPPED(&addr.addr.addr6)) | GETSHORT(addr.srv.srvport, p1); |
| if (!extract_name(header, qlen, &p1, name, 1, 0)) |
| return 0; |
| addr.srv.targetlen = strlen(name) + 1; /* include terminating zero */ |
| if (!(addr.srv.target = blockdata_alloc(name, addr.srv.targetlen))) |
| return 0; |
| |
| /* we overwrote the original name, so get it back here. */ |
| if (!extract_name(header, qlen, &tmp, name, 1, 0)) |
| return 0; |
| } |
| else |
| { |
| /* copy address into aligned storage */ |
| if (!CHECK_LEN(header, p1, qlen, addrlen)) |
| return 0; /* bad packet */ |
| memcpy(&addr, p1, addrlen); |
| |
| /* check for returned address in private space */ |
| if (check_rebind) |
{ |
{ |
struct in_addr v4; | if ((flags & F_IPV4) && |
v4.s_addr = ((const uint32_t *) (&addr.addr.addr6))[3]; | private_net(addr.addr4, !option_bool(OPT_LOCAL_REBIND))) |
if (private_net(v4, !option_bool(OPT_LOCAL_REBIND))) | |
return 1; |
return 1; |
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/* Block IPv4-mapped IPv6 addresses in private IPv4 address space */ |
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if (flags & F_IPV6) |
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{ |
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if (IN6_IS_ADDR_V4MAPPED(&addr.addr6)) |
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{ |
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struct in_addr v4; |
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v4.s_addr = ((const uint32_t *) (&addr.addr6))[3]; |
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if (private_net(v4, !option_bool(OPT_LOCAL_REBIND))) |
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return 1; |
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} |
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/* Check for link-local (LL) and site-local (ULA) IPv6 addresses */ |
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if (IN6_IS_ADDR_LINKLOCAL(&addr.addr6) || |
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IN6_IS_ADDR_SITELOCAL(&addr.addr6)) |
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return 1; |
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/* Check for the IPv6 loopback address (::1) when |
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option rebind-localhost-ok is NOT set */ |
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if (!option_bool(OPT_LOCAL_REBIND) && |
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IN6_IS_ADDR_LOOPBACK(&addr.addr6)) |
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return 1; |
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} |
} |
} |
#endif | |
} | |
| |
#ifdef HAVE_IPSET |
#ifdef HAVE_IPSET |
if (ipsets && (flags & (F_IPV4 | F_IPV6))) | if (ipsets && (flags & (F_IPV4 | F_IPV6))) |
{ | |
ipsets_cur = ipsets; | |
while (*ipsets_cur) | |
{ |
{ |
log_query((flags & (F_IPV4 | F_IPV6)) | F_IPSET, name, &addr, *ipsets_cur); | ipsets_cur = ipsets; |
add_to_ipset(*ipsets_cur++, &addr, flags, 0); | while (*ipsets_cur) |
| { |
| log_query((flags & (F_IPV4 | F_IPV6)) | F_IPSET, name, &addr, *ipsets_cur); |
| add_to_ipset(*ipsets_cur++, &addr, flags, 0); |
| } |
} |
} |
} |
|
#endif |
#endif |
|
} |
|
|
newc = cache_insert(name, &addr, now, attl, flags | F_FORWARD | secflag); | newc = cache_insert(name, &addr, C_IN, now, attl, flags | F_FORWARD | secflag); |
if (newc && cpp) |
if (newc && cpp) |
{ |
{ |
|
next_uid(newc); |
cpp->addr.cname.target.cache = newc; |
cpp->addr.cname.target.cache = newc; |
cpp->addr.cname.uid = newc->uid; |
cpp->addr.cname.uid = newc->uid; |
} |
} |
Line 820 int extract_addresses(struct dns_header *header, size_
|
Line 859 int extract_addresses(struct dns_header *header, size_
|
pointing at this, inherit its TTL */ |
pointing at this, inherit its TTL */ |
if (ttl || cpp) |
if (ttl || cpp) |
{ |
{ |
newc = cache_insert(name, NULL, now, ttl ? ttl : cttl, F_FORWARD | F_NEG | flags | secflag); | newc = cache_insert(name, NULL, C_IN, now, ttl ? ttl : cttl, F_FORWARD | F_NEG | flags | (secure ? F_DNSSECOK : 0)); |
if (newc && cpp) |
if (newc && cpp) |
{ |
{ |
|
next_uid(newc); |
cpp->addr.cname.target.cache = newc; |
cpp->addr.cname.target.cache = newc; |
cpp->addr.cname.uid = newc->uid; |
cpp->addr.cname.uid = newc->uid; |
} |
} |
Line 875 unsigned int extract_request(struct dns_header *header
|
Line 915 unsigned int extract_request(struct dns_header *header
|
if (qtype == T_ANY) |
if (qtype == T_ANY) |
return F_IPV4 | F_IPV6; |
return F_IPV4 | F_IPV6; |
} |
} |
|
|
|
/* F_DNSSECOK as agument to search_servers() inhibits forwarding |
|
to servers for domains without a trust anchor. This make the |
|
behaviour for DS and DNSKEY queries we forward the same |
|
as for DS and DNSKEY queries we originate. */ |
|
if (qtype == T_DS || qtype == T_DNSKEY) |
|
return F_DNSSECOK; |
|
|
return F_QUERY; |
return F_QUERY; |
} |
} |
|
|
|
|
size_t setup_reply(struct dns_header *header, size_t qlen, |
size_t setup_reply(struct dns_header *header, size_t qlen, |
struct all_addr *addrp, unsigned int flags, unsigned long ttl) | union all_addr *addrp, unsigned int flags, unsigned long ttl) |
{ |
{ |
unsigned char *p; |
unsigned char *p; |
| |
if (!(p = skip_questions(header, qlen))) |
if (!(p = skip_questions(header, qlen))) |
return 0; |
return 0; |
|
|
/* clear authoritative and truncated flags, set QR flag */ |
/* clear authoritative and truncated flags, set QR flag */ |
header->hb3 = (header->hb3 & ~(HB3_AA | HB3_TC)) | HB3_QR; | header->hb3 = (header->hb3 & ~(HB3_AA | HB3_TC )) | HB3_QR; |
/* set RA flag */ | /* clear AD flag, set RA flag */ |
header->hb4 |= HB4_RA; | header->hb4 = (header->hb4 & ~HB4_AD) | HB4_RA; |
|
|
header->nscount = htons(0); |
header->nscount = htons(0); |
header->arcount = htons(0); |
header->arcount = htons(0); |
Line 900 size_t setup_reply(struct dns_header *header, size_t q
|
Line 946 size_t setup_reply(struct dns_header *header, size_t q
|
SET_RCODE(header, NOERROR); /* empty domain */ |
SET_RCODE(header, NOERROR); /* empty domain */ |
else if (flags == F_NXDOMAIN) |
else if (flags == F_NXDOMAIN) |
SET_RCODE(header, NXDOMAIN); |
SET_RCODE(header, NXDOMAIN); |
else if (flags == F_IPV4) | else if (flags == F_SERVFAIL) |
{ /* we know the address */ | { |
SET_RCODE(header, NOERROR); | union all_addr a; |
header->ancount = htons(1); | a.log.rcode = SERVFAIL; |
header->hb3 |= HB3_AA; | log_query(F_CONFIG | F_RCODE, "error", &a, NULL); |
add_resource_record(header, NULL, NULL, sizeof(struct dns_header), &p, ttl, NULL, T_A, C_IN, "4", addrp); | SET_RCODE(header, SERVFAIL); |
} |
} |
#ifdef HAVE_IPV6 | else if (flags & ( F_IPV4 | F_IPV6)) |
else if (flags == F_IPV6) | |
{ |
{ |
SET_RCODE(header, NOERROR); | if (flags & F_IPV4) |
header->ancount = htons(1); | { /* we know the address */ |
header->hb3 |= HB3_AA; | SET_RCODE(header, NOERROR); |
add_resource_record(header, NULL, NULL, sizeof(struct dns_header), &p, ttl, NULL, T_AAAA, C_IN, "6", addrp); | header->ancount = htons(1); |
| header->hb3 |= HB3_AA; |
| add_resource_record(header, NULL, NULL, sizeof(struct dns_header), &p, ttl, NULL, T_A, C_IN, "4", addrp); |
| } |
| |
| if (flags & F_IPV6) |
| { |
| SET_RCODE(header, NOERROR); |
| header->ancount = htons(ntohs(header->ancount) + 1); |
| header->hb3 |= HB3_AA; |
| add_resource_record(header, NULL, NULL, sizeof(struct dns_header), &p, ttl, NULL, T_AAAA, C_IN, "6", addrp); |
| } |
} |
} |
#endif |
|
else /* nowhere to forward to */ |
else /* nowhere to forward to */ |
SET_RCODE(header, REFUSED); | { |
| union all_addr a; |
| a.log.rcode = REFUSED; |
| log_query(F_CONFIG | F_RCODE, "error", &a, NULL); |
| SET_RCODE(header, REFUSED); |
| } |
| |
return p - (unsigned char *)header; |
return p - (unsigned char *)header; |
} |
} |
|
|
/* check if name matches local names ie from /etc/hosts or DHCP or local mx names. */ |
/* check if name matches local names ie from /etc/hosts or DHCP or local mx names. */ |
int check_for_local_domain(char *name, time_t now) |
int check_for_local_domain(char *name, time_t now) |
{ |
{ |
struct crec *crecp; |
|
struct mx_srv_record *mx; |
struct mx_srv_record *mx; |
struct txt_record *txt; |
struct txt_record *txt; |
struct interface_name *intr; |
struct interface_name *intr; |
struct ptr_record *ptr; |
struct ptr_record *ptr; |
struct naptr *naptr; |
struct naptr *naptr; |
|
|
/* Note: the call to cache_find_by_name is intended to find any record which matches |
|
ie A, AAAA, CNAME. */ |
|
|
|
if ((crecp = cache_find_by_name(NULL, name, now, F_IPV4 | F_IPV6 | F_CNAME |F_NO_RR)) && |
|
(crecp->flags & (F_HOSTS | F_DHCP | F_CONFIG))) |
|
return 1; |
|
|
|
for (naptr = daemon->naptr; naptr; naptr = naptr->next) |
for (naptr = daemon->naptr; naptr; naptr = naptr->next) |
if (hostname_isequal(name, naptr->name)) | if (hostname_issubdomain(name, naptr->name)) |
return 1; |
return 1; |
|
|
for (mx = daemon->mxnames; mx; mx = mx->next) |
for (mx = daemon->mxnames; mx; mx = mx->next) |
if (hostname_isequal(name, mx->name)) | if (hostname_issubdomain(name, mx->name)) |
return 1; |
return 1; |
|
|
for (txt = daemon->txt; txt; txt = txt->next) |
for (txt = daemon->txt; txt; txt = txt->next) |
if (hostname_isequal(name, txt->name)) | if (hostname_issubdomain(name, txt->name)) |
return 1; |
return 1; |
|
|
for (intr = daemon->int_names; intr; intr = intr->next) |
for (intr = daemon->int_names; intr; intr = intr->next) |
if (hostname_isequal(name, intr->name)) | if (hostname_issubdomain(name, intr->name)) |
return 1; |
return 1; |
|
|
for (ptr = daemon->ptr; ptr; ptr = ptr->next) |
for (ptr = daemon->ptr; ptr; ptr = ptr->next) |
if (hostname_isequal(name, ptr->name)) | if (hostname_issubdomain(name, ptr->name)) |
return 1; |
return 1; |
| |
| if (cache_find_non_terminal(name, now)) |
| return 1; |
| |
return 0; |
return 0; |
} |
} |
|
|
Line 998 int check_for_bogus_wildcard(struct dns_header *header
|
Line 1053 int check_for_bogus_wildcard(struct dns_header *header
|
/* Found a bogus address. Insert that info here, since there no SOA record |
/* Found a bogus address. Insert that info here, since there no SOA record |
to get the ttl from in the normal processing */ |
to get the ttl from in the normal processing */ |
cache_start_insert(); |
cache_start_insert(); |
cache_insert(name, NULL, now, ttl, F_IPV4 | F_FORWARD | F_NEG | F_NXDOMAIN); | cache_insert(name, NULL, C_IN, now, ttl, F_IPV4 | F_FORWARD | F_NEG | F_NXDOMAIN); |
cache_end_insert(); |
cache_end_insert(); |
|
|
return 1; |
return 1; |
Line 1049 int check_for_ignored_address(struct dns_header *heade
|
Line 1104 int check_for_ignored_address(struct dns_header *heade
|
return 0; |
return 0; |
} |
} |
|
|
|
|
int add_resource_record(struct dns_header *header, char *limit, int *truncp, int nameoffset, unsigned char **pp, |
int add_resource_record(struct dns_header *header, char *limit, int *truncp, int nameoffset, unsigned char **pp, |
unsigned long ttl, int *offset, unsigned short type, unsigned short class, char *format, ...) |
unsigned long ttl, int *offset, unsigned short type, unsigned short class, char *format, ...) |
{ |
{ |
Line 1058 int add_resource_record(struct dns_header *header, cha
|
Line 1114 int add_resource_record(struct dns_header *header, cha
|
unsigned short usval; |
unsigned short usval; |
long lval; |
long lval; |
char *sval; |
char *sval; |
|
|
|
#define CHECK_LIMIT(size) \ |
|
if (limit && p + (size) > (unsigned char*)limit) goto truncated; |
|
|
if (truncp && *truncp) |
|
return 0; |
|
|
|
va_start(ap, format); /* make ap point to 1st unamed argument */ |
va_start(ap, format); /* make ap point to 1st unamed argument */ |
|
|
|
if (truncp && *truncp) |
|
goto truncated; |
|
|
if (nameoffset > 0) |
if (nameoffset > 0) |
{ |
{ |
|
CHECK_LIMIT(2); |
PUTSHORT(nameoffset | 0xc000, p); |
PUTSHORT(nameoffset | 0xc000, p); |
} |
} |
else |
else |
{ |
{ |
char *name = va_arg(ap, char *); |
char *name = va_arg(ap, char *); |
if (name) | if (name && !(p = do_rfc1035_name(p, name, limit))) |
p = do_rfc1035_name(p, name); | goto truncated; |
| |
if (nameoffset < 0) |
if (nameoffset < 0) |
{ |
{ |
|
CHECK_LIMIT(2); |
PUTSHORT(-nameoffset | 0xc000, p); |
PUTSHORT(-nameoffset | 0xc000, p); |
} |
} |
else |
else |
*p++ = 0; | { |
| CHECK_LIMIT(1); |
| *p++ = 0; |
| } |
} |
} |
|
|
|
/* type (2) + class (2) + ttl (4) + rdlen (2) */ |
|
CHECK_LIMIT(10); |
|
|
PUTSHORT(type, p); |
PUTSHORT(type, p); |
PUTSHORT(class, p); |
PUTSHORT(class, p); |
PUTLONG(ttl, p); /* TTL */ |
PUTLONG(ttl, p); /* TTL */ |
Line 1091 int add_resource_record(struct dns_header *header, cha
|
Line 1159 int add_resource_record(struct dns_header *header, cha
|
for (; *format; format++) |
for (; *format; format++) |
switch (*format) |
switch (*format) |
{ |
{ |
#ifdef HAVE_IPV6 |
|
case '6': |
case '6': |
|
CHECK_LIMIT(IN6ADDRSZ); |
sval = va_arg(ap, char *); |
sval = va_arg(ap, char *); |
memcpy(p, sval, IN6ADDRSZ); |
memcpy(p, sval, IN6ADDRSZ); |
p += IN6ADDRSZ; |
p += IN6ADDRSZ; |
break; |
break; |
#endif |
|
|
|
case '4': |
case '4': |
|
CHECK_LIMIT(INADDRSZ); |
sval = va_arg(ap, char *); |
sval = va_arg(ap, char *); |
memcpy(p, sval, INADDRSZ); |
memcpy(p, sval, INADDRSZ); |
p += INADDRSZ; |
p += INADDRSZ; |
break; |
break; |
|
|
case 'b': |
case 'b': |
|
CHECK_LIMIT(1); |
usval = va_arg(ap, int); |
usval = va_arg(ap, int); |
*p++ = usval; |
*p++ = usval; |
break; |
break; |
|
|
case 's': |
case 's': |
|
CHECK_LIMIT(2); |
usval = va_arg(ap, int); |
usval = va_arg(ap, int); |
PUTSHORT(usval, p); |
PUTSHORT(usval, p); |
break; |
break; |
|
|
case 'l': |
case 'l': |
|
CHECK_LIMIT(4); |
lval = va_arg(ap, long); |
lval = va_arg(ap, long); |
PUTLONG(lval, p); |
PUTLONG(lval, p); |
break; |
break; |
|
|
case 'd': |
case 'd': |
/* get domain-name answer arg and store it in RDATA field */ | /* get domain-name answer arg and store it in RDATA field */ |
if (offset) | if (offset) |
*offset = p - (unsigned char *)header; | *offset = p - (unsigned char *)header; |
p = do_rfc1035_name(p, va_arg(ap, char *)); | if (!(p = do_rfc1035_name(p, va_arg(ap, char *), limit))) |
*p++ = 0; | goto truncated; |
| CHECK_LIMIT(1); |
| *p++ = 0; |
break; |
break; |
|
|
case 't': |
case 't': |
usval = va_arg(ap, int); |
usval = va_arg(ap, int); |
|
CHECK_LIMIT(usval); |
sval = va_arg(ap, char *); |
sval = va_arg(ap, char *); |
if (usval != 0) |
if (usval != 0) |
memcpy(p, sval, usval); |
memcpy(p, sval, usval); |
Line 1141 int add_resource_record(struct dns_header *header, cha
|
Line 1215 int add_resource_record(struct dns_header *header, cha
|
usval = sval ? strlen(sval) : 0; |
usval = sval ? strlen(sval) : 0; |
if (usval > 255) |
if (usval > 255) |
usval = 255; |
usval = 255; |
|
CHECK_LIMIT(usval + 1); |
*p++ = (unsigned char)usval; |
*p++ = (unsigned char)usval; |
memcpy(p, sval, usval); |
memcpy(p, sval, usval); |
p += usval; |
p += usval; |
Line 1149 int add_resource_record(struct dns_header *header, cha
|
Line 1224 int add_resource_record(struct dns_header *header, cha
|
|
|
va_end(ap); /* clean up variable argument pointer */ |
va_end(ap); /* clean up variable argument pointer */ |
|
|
|
/* Now, store real RDLength. sav already checked against limit. */ |
j = p - sav - 2; |
j = p - sav - 2; |
PUTSHORT(j, sav); /* Now, store real RDLength */ | PUTSHORT(j, sav); |
|
|
/* check for overflow of buffer */ |
|
if (limit && ((unsigned char *)limit - p) < 0) |
|
{ |
|
if (truncp) |
|
*truncp = 1; |
|
return 0; |
|
} |
|
|
|
*pp = p; |
*pp = p; |
return 1; |
return 1; |
|
|
|
truncated: |
|
va_end(ap); |
|
if (truncp) |
|
*truncp = 1; |
|
return 0; |
|
|
|
#undef CHECK_LIMIT |
} |
} |
|
|
static unsigned long crec_ttl(struct crec *crecp, time_t now) |
static unsigned long crec_ttl(struct crec *crecp, time_t now) |
Line 1184 static unsigned long crec_ttl(struct crec *crecp, time
|
Line 1260 static unsigned long crec_ttl(struct crec *crecp, time
|
if (crecp->flags & F_IMMORTAL) |
if (crecp->flags & F_IMMORTAL) |
return crecp->ttd; |
return crecp->ttd; |
|
|
/* Return the Max TTL value if it is lower then the actual TTL */ | /* Return the Max TTL value if it is lower than the actual TTL */ |
if (daemon->max_ttl == 0 || ((unsigned)(crecp->ttd - now) < daemon->max_ttl)) |
if (daemon->max_ttl == 0 || ((unsigned)(crecp->ttd - now) < daemon->max_ttl)) |
return crecp->ttd - now; |
return crecp->ttd - now; |
else |
else |
return daemon->max_ttl; |
return daemon->max_ttl; |
} |
} |
|
|
|
|
|
static int cache_validated(const struct crec *crecp) |
|
{ |
|
return (option_bool(OPT_DNSSEC_VALID) && !(crecp->flags & F_DNSSECOK)); |
|
} |
|
|
/* return zero if we can't answer from cache, or packet size if we can */ |
/* return zero if we can't answer from cache, or packet size if we can */ |
size_t answer_request(struct dns_header *header, char *limit, size_t qlen, |
size_t answer_request(struct dns_header *header, char *limit, size_t qlen, |
struct in_addr local_addr, struct in_addr local_netmask, |
struct in_addr local_addr, struct in_addr local_netmask, |
Line 1200 size_t answer_request(struct dns_header *header, char
|
Line 1280 size_t answer_request(struct dns_header *header, char
|
char *name = daemon->namebuff; |
char *name = daemon->namebuff; |
unsigned char *p, *ansp; |
unsigned char *p, *ansp; |
unsigned int qtype, qclass; |
unsigned int qtype, qclass; |
struct all_addr addr; | union all_addr addr; |
int nameoffset; |
int nameoffset; |
unsigned short flag; |
unsigned short flag; |
int q, ans, anscount = 0, addncount = 0; |
int q, ans, anscount = 0, addncount = 0; |
int dryrun = 0; |
int dryrun = 0; |
struct crec *crecp; |
struct crec *crecp; |
int nxdomain = 0, auth = 1, trunc = 0, sec_data = 1; | int nxdomain = 0, notimp = 0, auth = 1, trunc = 0, sec_data = 1; |
struct mx_srv_record *rec; |
struct mx_srv_record *rec; |
size_t len; |
size_t len; |
| int rd_bit = (header->hb3 & HB3_RD); |
| |
| /* never answer queries with RD unset, to avoid cache snooping. */ |
if (ntohs(header->ancount) != 0 || |
if (ntohs(header->ancount) != 0 || |
ntohs(header->nscount) != 0 || |
ntohs(header->nscount) != 0 || |
ntohs(header->qdcount) == 0 || | ntohs(header->qdcount) == 0 || |
OPCODE(header) != QUERY ) |
OPCODE(header) != QUERY ) |
return 0; |
return 0; |
| |
/* Don't return AD set if checking disabled. */ |
/* Don't return AD set if checking disabled. */ |
if (header->hb4 & HB4_CD) |
if (header->hb4 & HB4_CD) |
sec_data = 0; |
sec_data = 0; |
Line 1239 size_t answer_request(struct dns_header *header, char
|
Line 1321 size_t answer_request(struct dns_header *header, char
|
|
|
for (q = ntohs(header->qdcount); q != 0; q--) |
for (q = ntohs(header->qdcount); q != 0; q--) |
{ |
{ |
|
int count = 255; /* catch loops */ |
|
|
/* save pointer to name for copying into answers */ |
/* save pointer to name for copying into answers */ |
nameoffset = p - (unsigned char *)header; |
nameoffset = p - (unsigned char *)header; |
|
|
Line 1250 size_t answer_request(struct dns_header *header, char
|
Line 1334 size_t answer_request(struct dns_header *header, char
|
GETSHORT(qclass, p); |
GETSHORT(qclass, p); |
|
|
ans = 0; /* have we answered this question */ |
ans = 0; /* have we answered this question */ |
| |
| while (--count != 0 && (crecp = cache_find_by_name(NULL, name, now, F_CNAME))) |
| { |
| char *cname_target = cache_get_cname_target(crecp); |
| |
| /* If the client asked for DNSSEC don't use cached data. */ |
| if ((crecp->flags & (F_HOSTS | F_DHCP | F_CONFIG)) || |
| (rd_bit && (!do_bit || cache_validated(crecp)))) |
| { |
| if (crecp->flags & F_CONFIG || qtype == T_CNAME) |
| ans = 1; |
| |
| if (!(crecp->flags & F_DNSSECOK)) |
| sec_data = 0; |
| |
| if (!dryrun) |
| { |
| log_query(crecp->flags, name, NULL, record_source(crecp->uid)); |
| if (add_resource_record(header, limit, &trunc, nameoffset, &ansp, |
| crec_ttl(crecp, now), &nameoffset, |
| T_CNAME, C_IN, "d", cname_target)) |
| anscount++; |
| } |
| |
| } |
| else |
| return 0; /* give up if any cached CNAME in chain can't be used for DNSSEC reasons. */ |
| |
| strcpy(name, cname_target); |
| } |
| |
if (qtype == T_TXT || qtype == T_ANY) |
if (qtype == T_TXT || qtype == T_ANY) |
{ |
{ |
struct txt_record *t; |
struct txt_record *t; |
Line 1258 size_t answer_request(struct dns_header *header, char
|
Line 1372 size_t answer_request(struct dns_header *header, char
|
{ |
{ |
if (t->class == qclass && hostname_isequal(name, t->name)) |
if (t->class == qclass && hostname_isequal(name, t->name)) |
{ |
{ |
ans = 1; | ans = 1, sec_data = 0; |
if (!dryrun) |
if (!dryrun) |
{ |
{ |
unsigned long ttl = daemon->local_ttl; |
unsigned long ttl = daemon->local_ttl; |
int ok = 1; |
int ok = 1; |
log_query(F_CONFIG | F_RRNAME, name, NULL, "<TXT>"); | #ifndef NO_ID |
/* Dynamically generate stat record */ |
/* Dynamically generate stat record */ |
if (t->stat != 0) |
if (t->stat != 0) |
{ |
{ |
Line 1271 size_t answer_request(struct dns_header *header, char
|
Line 1385 size_t answer_request(struct dns_header *header, char
|
if (!cache_make_stat(t)) |
if (!cache_make_stat(t)) |
ok = 0; |
ok = 0; |
} |
} |
| #endif |
if (ok && add_resource_record(header, limit, &trunc, nameoffset, &ansp, | if (ok) |
ttl, NULL, | { |
T_TXT, t->class, "t", t->len, t->txt)) | log_query(F_CONFIG | F_RRNAME, name, NULL, "<TXT>"); |
anscount++; | if (add_resource_record(header, limit, &trunc, nameoffset, &ansp, |
| ttl, NULL, |
| T_TXT, t->class, "t", t->len, t->txt)) |
| anscount++; |
| } |
| } |
| } |
| } |
| } |
|
|
|
if (qclass == C_CHAOS) |
|
{ |
|
/* don't forward *.bind and *.server chaos queries - always reply with NOTIMP */ |
|
if (hostname_issubdomain("bind", name) || hostname_issubdomain("server", name)) |
|
{ |
|
if (!ans) |
|
{ |
|
notimp = 1, auth = 0; |
|
if (!dryrun) |
|
{ |
|
addr.log.rcode = NOTIMP; |
|
log_query(F_CONFIG | F_RCODE, name, &addr, NULL); |
} |
} |
|
ans = 1, sec_data = 0; |
} |
} |
} |
} |
} |
} |
Line 1293 size_t answer_request(struct dns_header *header, char
|
Line 1428 size_t answer_request(struct dns_header *header, char
|
sec_data = 0; |
sec_data = 0; |
if (!dryrun) |
if (!dryrun) |
{ |
{ |
log_query(F_CONFIG | F_RRNAME, name, NULL, "<RR>"); | log_query(F_CONFIG | F_RRNAME, name, NULL, querystr(NULL, t->class)); |
if (add_resource_record(header, limit, &trunc, nameoffset, &ansp, |
if (add_resource_record(header, limit, &trunc, nameoffset, &ansp, |
daemon->local_ttl, NULL, |
daemon->local_ttl, NULL, |
t->class, C_IN, "t", t->len, t->txt)) |
t->class, C_IN, "t", t->len, t->txt)) |
anscount ++; | anscount++; |
} |
} |
} |
} |
|
|
Line 1318 size_t answer_request(struct dns_header *header, char
|
Line 1453 size_t answer_request(struct dns_header *header, char
|
struct addrlist *addrlist; |
struct addrlist *addrlist; |
|
|
for (addrlist = intr->addr; addrlist; addrlist = addrlist->next) |
for (addrlist = intr->addr; addrlist; addrlist = addrlist->next) |
if (!(addrlist->flags & ADDRLIST_IPV6) && addr.addr.addr4.s_addr == addrlist->addr.addr.addr4.s_addr) | if (!(addrlist->flags & ADDRLIST_IPV6) && addr.addr4.s_addr == addrlist->addr.addr4.s_addr) |
break; |
break; |
|
|
if (addrlist) |
if (addrlist) |
Line 1327 size_t answer_request(struct dns_header *header, char
|
Line 1462 size_t answer_request(struct dns_header *header, char
|
while (intr->next && strcmp(intr->intr, intr->next->intr) == 0) |
while (intr->next && strcmp(intr->intr, intr->next->intr) == 0) |
intr = intr->next; |
intr = intr->next; |
} |
} |
#ifdef HAVE_IPV6 |
|
else if (is_arpa == F_IPV6) |
else if (is_arpa == F_IPV6) |
for (intr = daemon->int_names; intr; intr = intr->next) |
for (intr = daemon->int_names; intr; intr = intr->next) |
{ |
{ |
struct addrlist *addrlist; |
struct addrlist *addrlist; |
|
|
for (addrlist = intr->addr; addrlist; addrlist = addrlist->next) |
for (addrlist = intr->addr; addrlist; addrlist = addrlist->next) |
if ((addrlist->flags & ADDRLIST_IPV6) && IN6_ARE_ADDR_EQUAL(&addr.addr.addr6, &addrlist->addr.addr.addr6)) | if ((addrlist->flags & ADDRLIST_IPV6) && IN6_ARE_ADDR_EQUAL(&addr.addr6, &addrlist->addr.addr6)) |
break; |
break; |
|
|
if (addrlist) |
if (addrlist) |
Line 1343 size_t answer_request(struct dns_header *header, char
|
Line 1477 size_t answer_request(struct dns_header *header, char
|
while (intr->next && strcmp(intr->intr, intr->next->intr) == 0) |
while (intr->next && strcmp(intr->intr, intr->next->intr) == 0) |
intr = intr->next; |
intr = intr->next; |
} |
} |
#endif |
|
|
|
if (intr) |
if (intr) |
{ |
{ |
Line 1379 size_t answer_request(struct dns_header *header, char
|
Line 1512 size_t answer_request(struct dns_header *header, char
|
/* Don't use cache when DNSSEC data required, unless we know that |
/* Don't use cache when DNSSEC data required, unless we know that |
the zone is unsigned, which implies that we're doing |
the zone is unsigned, which implies that we're doing |
validation. */ |
validation. */ |
if ((crecp->flags & (F_HOSTS | F_DHCP | F_CONFIG)) || | if ((crecp->flags & (F_HOSTS | F_DHCP | F_CONFIG)) || |
!do_bit || | (rd_bit && (!do_bit || cache_validated(crecp)) )) |
(option_bool(OPT_DNSSEC_VALID) && !(crecp->flags & F_DNSSECOK))) | |
{ |
{ |
do |
do |
{ |
{ |
Line 1434 size_t answer_request(struct dns_header *header, char
|
Line 1566 size_t answer_request(struct dns_header *header, char
|
anscount++; |
anscount++; |
} |
} |
} |
} |
else if (is_arpa == F_IPV4 && | else if (option_bool(OPT_BOGUSPRIV) && ( |
option_bool(OPT_BOGUSPRIV) && | (is_arpa == F_IPV6 && private_net6(&addr.addr6)) || |
private_net(addr.addr.addr4, 1)) | (is_arpa == F_IPV4 && private_net(addr.addr4, 1)))) |
{ |
{ |
/* if not in cache, enabled and private IPV4 address, return NXDOMAIN */ | struct server *serv; |
ans = 1; | unsigned int namelen = strlen(name); |
sec_data = 0; | char *nameend = name + namelen; |
nxdomain = 1; | |
if (!dryrun) | |
log_query(F_CONFIG | F_REVERSE | F_IPV4 | F_NEG | F_NXDOMAIN, | |
name, &addr, NULL); | |
} | |
} | |
| |
for (flag = F_IPV4; flag; flag = (flag == F_IPV4) ? F_IPV6 : 0) | |
{ | |
unsigned short type = T_A; | |
struct interface_name *intr; | |
|
|
if (flag == F_IPV6) | /* see if have rev-server set */ |
#ifdef HAVE_IPV6 | for (serv = daemon->servers; serv; serv = serv->next) |
type = T_AAAA; | |
#else | |
break; | |
#endif | |
| |
if (qtype != type && qtype != T_ANY) | |
continue; | |
| |
/* Check for "A for A" queries; be rather conservative | |
about what looks like dotted-quad. */ | |
if (qtype == T_A) | |
{ | |
char *cp; | |
unsigned int i, a; | |
int x; | |
| |
for (cp = name, i = 0, a = 0; *cp; i++) | |
{ |
{ |
if (!isdigit((unsigned char)*cp) || (x = strtol(cp, &cp, 10)) > 255) | unsigned int domainlen; |
{ | char *matchstart; |
i = 5; | |
break; | if ((serv->flags & (SERV_HAS_DOMAIN | SERV_NO_ADDR)) != SERV_HAS_DOMAIN) |
} | continue; |
| |
a = (a << 8) + x; | domainlen = strlen(serv->domain); |
| if (domainlen == 0 || domainlen > namelen) |
if (*cp == '.') | continue; |
cp++; | |
| matchstart = nameend - domainlen; |
| if (hostname_isequal(matchstart, serv->domain) && |
| (namelen == domainlen || *(matchstart-1) == '.' )) |
| break; |
} |
} |
| |
if (i == 4) | /* if no configured server, not in cache, enabled and private IPV4 address, return NXDOMAIN */ |
| if (!serv) |
{ |
{ |
ans = 1; |
ans = 1; |
sec_data = 0; |
sec_data = 0; |
|
nxdomain = 1; |
if (!dryrun) |
if (!dryrun) |
{ | log_query(F_CONFIG | F_REVERSE | is_arpa | F_NEG | F_NXDOMAIN, |
addr.addr.addr4.s_addr = htonl(a); | name, &addr, NULL); |
log_query(F_FORWARD | F_CONFIG | F_IPV4, name, &addr, NULL); | |
if (add_resource_record(header, limit, &trunc, nameoffset, &ansp, | |
daemon->local_ttl, NULL, type, C_IN, "4", &addr)) | |
anscount++; | |
} | |
continue; | |
} |
} |
} |
} |
|
} |
|
|
|
for (flag = F_IPV4; flag; flag = (flag == F_IPV4) ? F_IPV6 : 0) |
|
{ |
|
unsigned short type = (flag == F_IPV6) ? T_AAAA : T_A; |
|
struct interface_name *intr; |
|
|
|
if (qtype != type && qtype != T_ANY) |
|
continue; |
|
|
/* interface name stuff */ |
/* interface name stuff */ |
intname_restart: |
|
for (intr = daemon->int_names; intr; intr = intr->next) |
for (intr = daemon->int_names; intr; intr = intr->next) |
if (hostname_isequal(name, intr->name)) |
if (hostname_isequal(name, intr->name)) |
break; |
break; |
Line 1510 size_t answer_request(struct dns_header *header, char
|
Line 1622 size_t answer_request(struct dns_header *header, char
|
if (intr) |
if (intr) |
{ |
{ |
struct addrlist *addrlist; |
struct addrlist *addrlist; |
int gotit = 0; | int gotit = 0, localise = 0; |
|
|
enumerate_interfaces(0); |
enumerate_interfaces(0); |
|
|
|
/* See if a putative address is on the network from which we received |
|
the query, is so we'll filter other answers. */ |
|
if (local_addr.s_addr != 0 && option_bool(OPT_LOCALISE) && type == T_A) |
|
for (intr = daemon->int_names; intr; intr = intr->next) |
|
if (hostname_isequal(name, intr->name)) |
|
for (addrlist = intr->addr; addrlist; addrlist = addrlist->next) |
|
if (!(addrlist->flags & ADDRLIST_IPV6) && |
|
is_same_net(addrlist->addr.addr4, local_addr, local_netmask)) |
|
{ |
|
localise = 1; |
|
break; |
|
} |
|
|
for (intr = daemon->int_names; intr; intr = intr->next) |
for (intr = daemon->int_names; intr; intr = intr->next) |
if (hostname_isequal(name, intr->name)) |
if (hostname_isequal(name, intr->name)) |
{ |
{ |
for (addrlist = intr->addr; addrlist; addrlist = addrlist->next) |
for (addrlist = intr->addr; addrlist; addrlist = addrlist->next) |
#ifdef HAVE_IPV6 |
|
if (((addrlist->flags & ADDRLIST_IPV6) ? T_AAAA : T_A) == type) |
if (((addrlist->flags & ADDRLIST_IPV6) ? T_AAAA : T_A) == type) |
#endif |
|
{ |
{ |
#ifdef HAVE_IPV6 | if (localise && |
| !is_same_net(addrlist->addr.addr4, local_addr, local_netmask)) |
| continue; |
| |
if (addrlist->flags & ADDRLIST_REVONLY) |
if (addrlist->flags & ADDRLIST_REVONLY) |
continue; |
continue; |
#endif | |
ans = 1; |
ans = 1; |
sec_data = 0; |
sec_data = 0; |
if (!dryrun) |
if (!dryrun) |
Line 1546 size_t answer_request(struct dns_header *header, char
|
Line 1672 size_t answer_request(struct dns_header *header, char
|
continue; |
continue; |
} |
} |
|
|
cname_restart: | if ((crecp = cache_find_by_name(NULL, name, now, flag | (dryrun ? F_NO_RR : 0)))) |
if ((crecp = cache_find_by_name(NULL, name, now, flag | F_CNAME | (dryrun ? F_NO_RR : 0)))) | |
{ |
{ |
int localise = 0; |
int localise = 0; |
|
|
/* See if a putative address is on the network from which we recieved | /* See if a putative address is on the network from which we received |
the query, is so we'll filter other answers. */ |
the query, is so we'll filter other answers. */ |
if (local_addr.s_addr != 0 && option_bool(OPT_LOCALISE) && flag == F_IPV4) |
if (local_addr.s_addr != 0 && option_bool(OPT_LOCALISE) && flag == F_IPV4) |
{ |
{ |
struct crec *save = crecp; |
struct crec *save = crecp; |
do { |
do { |
if ((crecp->flags & F_HOSTS) && |
if ((crecp->flags & F_HOSTS) && |
is_same_net(*((struct in_addr *)&crecp->addr), local_addr, local_netmask)) | is_same_net(crecp->addr.addr4, local_addr, local_netmask)) |
{ |
{ |
localise = 1; |
localise = 1; |
break; |
break; |
} |
} |
} while ((crecp = cache_find_by_name(crecp, name, now, flag | F_CNAME))); | } while ((crecp = cache_find_by_name(crecp, name, now, flag))); |
crecp = save; |
crecp = save; |
} |
} |
|
|
/* If the client asked for DNSSEC don't use cached data. */ |
/* If the client asked for DNSSEC don't use cached data. */ |
if ((crecp->flags & (F_HOSTS | F_DHCP | F_CONFIG)) || !do_bit || !(crecp->flags & F_DNSSECOK)) | if ((crecp->flags & (F_HOSTS | F_DHCP | F_CONFIG)) || |
| (rd_bit && (!do_bit || cache_validated(crecp)) )) |
do |
do |
{ |
{ |
/* don't answer wildcard queries with data not from /etc/hosts |
/* don't answer wildcard queries with data not from /etc/hosts |
Line 1579 size_t answer_request(struct dns_header *header, char
|
Line 1705 size_t answer_request(struct dns_header *header, char
|
if (!(crecp->flags & F_DNSSECOK)) |
if (!(crecp->flags & F_DNSSECOK)) |
sec_data = 0; |
sec_data = 0; |
|
|
if (crecp->flags & F_CNAME) |
|
{ |
|
char *cname_target = cache_get_cname_target(crecp); |
|
|
|
if (!dryrun) |
|
{ |
|
log_query(crecp->flags, name, NULL, record_source(crecp->uid)); |
|
if (add_resource_record(header, limit, &trunc, nameoffset, &ansp, |
|
crec_ttl(crecp, now), &nameoffset, |
|
T_CNAME, C_IN, "d", cname_target)) |
|
anscount++; |
|
} |
|
|
|
strcpy(name, cname_target); |
|
/* check if target interface_name */ |
|
if (crecp->addr.cname.uid == SRC_INTERFACE) |
|
goto intname_restart; |
|
else |
|
goto cname_restart; |
|
} |
|
|
|
if (crecp->flags & F_NEG) |
if (crecp->flags & F_NEG) |
{ |
{ |
ans = 1; |
ans = 1; |
Line 1615 size_t answer_request(struct dns_header *header, char
|
Line 1720 size_t answer_request(struct dns_header *header, char
|
filter here. */ |
filter here. */ |
if (localise && |
if (localise && |
(crecp->flags & F_HOSTS) && |
(crecp->flags & F_HOSTS) && |
!is_same_net(*((struct in_addr *)&crecp->addr), local_addr, local_netmask)) | !is_same_net(crecp->addr.addr4, local_addr, local_netmask)) |
continue; |
continue; |
|
|
if (!(crecp->flags & (F_HOSTS | F_DHCP))) |
if (!(crecp->flags & (F_HOSTS | F_DHCP))) |
Line 1624 size_t answer_request(struct dns_header *header, char
|
Line 1729 size_t answer_request(struct dns_header *header, char
|
ans = 1; |
ans = 1; |
if (!dryrun) |
if (!dryrun) |
{ |
{ |
log_query(crecp->flags & ~F_REVERSE, name, &crecp->addr.addr, | log_query(crecp->flags & ~F_REVERSE, name, &crecp->addr, |
record_source(crecp->uid)); |
record_source(crecp->uid)); |
|
|
if (add_resource_record(header, limit, &trunc, nameoffset, &ansp, |
if (add_resource_record(header, limit, &trunc, nameoffset, &ansp, |
Line 1633 size_t answer_request(struct dns_header *header, char
|
Line 1738 size_t answer_request(struct dns_header *header, char
|
anscount++; |
anscount++; |
} |
} |
} |
} |
} while ((crecp = cache_find_by_name(crecp, name, now, flag | F_CNAME))); | } while ((crecp = cache_find_by_name(crecp, name, now, flag))); |
} |
} |
else if (is_name_synthetic(flag, name, &addr)) |
else if (is_name_synthetic(flag, name, &addr)) |
{ |
{ |
ans = 1; | ans = 1, sec_data = 0; |
if (!dryrun) |
if (!dryrun) |
{ |
{ |
log_query(F_FORWARD | F_CONFIG | flag, name, &addr, NULL); |
log_query(F_FORWARD | F_CONFIG | flag, name, &addr, NULL); |
Line 1648 size_t answer_request(struct dns_header *header, char
|
Line 1753 size_t answer_request(struct dns_header *header, char
|
} |
} |
} |
} |
|
|
if (qtype == T_CNAME || qtype == T_ANY) |
|
{ |
|
if ((crecp = cache_find_by_name(NULL, name, now, F_CNAME)) && |
|
(qtype == T_CNAME || (crecp->flags & (F_HOSTS | F_DHCP | F_CONFIG | (dryrun ? F_NO_RR : 0))))) |
|
{ |
|
if (!(crecp->flags & F_DNSSECOK)) |
|
sec_data = 0; |
|
|
|
ans = 1; |
|
if (!dryrun) |
|
{ |
|
log_query(crecp->flags, name, NULL, record_source(crecp->uid)); |
|
if (add_resource_record(header, limit, &trunc, nameoffset, &ansp, |
|
crec_ttl(crecp, now), &nameoffset, |
|
T_CNAME, C_IN, "d", cache_get_cname_target(crecp))) |
|
anscount++; |
|
} |
|
} |
|
} |
|
|
|
if (qtype == T_MX || qtype == T_ANY) |
if (qtype == T_MX || qtype == T_ANY) |
{ |
{ |
int found = 0; |
int found = 0; |
for (rec = daemon->mxnames; rec; rec = rec->next) |
for (rec = daemon->mxnames; rec; rec = rec->next) |
if (!rec->issrv && hostname_isequal(name, rec->name)) |
if (!rec->issrv && hostname_isequal(name, rec->name)) |
{ |
{ |
ans = found = 1; | ans = found = 1; |
if (!dryrun) | sec_data = 0; |
{ | if (!dryrun) |
int offset; | { |
log_query(F_CONFIG | F_RRNAME, name, NULL, "<MX>"); | int offset; |
if (add_resource_record(header, limit, &trunc, nameoffset, &ansp, daemon->local_ttl, | log_query(F_CONFIG | F_RRNAME, name, NULL, "<MX>"); |
&offset, T_MX, C_IN, "sd", rec->weight, rec->target)) | if (add_resource_record(header, limit, &trunc, nameoffset, &ansp, daemon->local_ttl, |
{ | &offset, T_MX, C_IN, "sd", rec->weight, rec->target)) |
anscount++; | { |
if (rec->target) | anscount++; |
rec->offset = offset; | if (rec->target) |
} | rec->offset = offset; |
} | } |
| } |
} |
} |
|
|
if (!found && (option_bool(OPT_SELFMX) || option_bool(OPT_LOCALMX)) && | if (!found && (option_bool(OPT_SELFMX) || option_bool(OPT_LOCALMX)) && |
cache_find_by_name(NULL, name, now, F_HOSTS | F_DHCP | F_NO_RR)) |
cache_find_by_name(NULL, name, now, F_HOSTS | F_DHCP | F_NO_RR)) |
{ |
{ |
ans = 1; |
ans = 1; |
|
sec_data = 0; |
if (!dryrun) |
if (!dryrun) |
{ |
{ |
log_query(F_CONFIG | F_RRNAME, name, NULL, "<MX>"); |
log_query(F_CONFIG | F_RRNAME, name, NULL, "<MX>"); |
Line 1713 size_t answer_request(struct dns_header *header, char
|
Line 1800 size_t answer_request(struct dns_header *header, char
|
if (rec->issrv && hostname_isequal(name, rec->name)) |
if (rec->issrv && hostname_isequal(name, rec->name)) |
{ |
{ |
found = ans = 1; |
found = ans = 1; |
|
sec_data = 0; |
if (!dryrun) |
if (!dryrun) |
{ |
{ |
int offset; |
int offset; |
Line 1745 size_t answer_request(struct dns_header *header, char
|
Line 1833 size_t answer_request(struct dns_header *header, char
|
*up = move; |
*up = move; |
move->next = NULL; |
move->next = NULL; |
} |
} |
| |
| if (!found) |
| { |
| if ((crecp = cache_find_by_name(NULL, name, now, F_SRV | (dryrun ? F_NO_RR : 0))) && |
| rd_bit && (!do_bit || (option_bool(OPT_DNSSEC_VALID) && !(crecp->flags & F_DNSSECOK)))) |
| { |
| if (!(crecp->flags & F_DNSSECOK)) |
| sec_data = 0; |
| |
| auth = 0; |
| found = ans = 1; |
| |
| do { |
| if (crecp->flags & F_NEG) |
| { |
| if (crecp->flags & F_NXDOMAIN) |
| nxdomain = 1; |
| if (!dryrun) |
| log_query(crecp->flags, name, NULL, NULL); |
| } |
| else if (!dryrun) |
| { |
| char *target = blockdata_retrieve(crecp->addr.srv.target, crecp->addr.srv.targetlen, NULL); |
| log_query(crecp->flags, name, NULL, 0); |
| |
| if (add_resource_record(header, limit, &trunc, nameoffset, &ansp, |
| crec_ttl(crecp, now), NULL, T_SRV, C_IN, "sssd", |
| crecp->addr.srv.priority, crecp->addr.srv.weight, crecp->addr.srv.srvport, |
| target)) |
| anscount++; |
| } |
| } while ((crecp = cache_find_by_name(crecp, name, now, F_SRV))); |
| } |
| } |
| |
if (!found && option_bool(OPT_FILTER) && (qtype == T_SRV || (qtype == T_ANY && strchr(name, '_')))) |
if (!found && option_bool(OPT_FILTER) && (qtype == T_SRV || (qtype == T_ANY && strchr(name, '_')))) |
{ |
{ |
ans = 1; |
ans = 1; |
|
sec_data = 0; |
if (!dryrun) |
if (!dryrun) |
log_query(F_CONFIG | F_NEG, name, NULL, NULL); |
log_query(F_CONFIG | F_NEG, name, NULL, NULL); |
} |
} |
Line 1761 size_t answer_request(struct dns_header *header, char
|
Line 1884 size_t answer_request(struct dns_header *header, char
|
if (hostname_isequal(name, na->name)) |
if (hostname_isequal(name, na->name)) |
{ |
{ |
ans = 1; |
ans = 1; |
|
sec_data = 0; |
if (!dryrun) |
if (!dryrun) |
{ |
{ |
log_query(F_CONFIG | F_RRNAME, name, NULL, "<NAPTR>"); |
log_query(F_CONFIG | F_RRNAME, name, NULL, "<NAPTR>"); |
Line 1773 size_t answer_request(struct dns_header *header, char
|
Line 1897 size_t answer_request(struct dns_header *header, char
|
} |
} |
|
|
if (qtype == T_MAILB) |
if (qtype == T_MAILB) |
ans = 1, nxdomain = 1; | ans = 1, nxdomain = 1, sec_data = 0; |
|
|
if (qtype == T_SOA && option_bool(OPT_FILTER)) |
if (qtype == T_SOA && option_bool(OPT_FILTER)) |
{ |
{ |
ans = 1; | ans = 1; |
| sec_data = 0; |
if (!dryrun) |
if (!dryrun) |
log_query(F_CONFIG | F_NEG, name, &addr, NULL); |
log_query(F_CONFIG | F_NEG, name, &addr, NULL); |
} |
} |
Line 1806 size_t answer_request(struct dns_header *header, char
|
Line 1931 size_t answer_request(struct dns_header *header, char
|
crecp = NULL; |
crecp = NULL; |
while ((crecp = cache_find_by_name(crecp, rec->target, now, F_IPV4 | F_IPV6))) |
while ((crecp = cache_find_by_name(crecp, rec->target, now, F_IPV4 | F_IPV6))) |
{ |
{ |
#ifdef HAVE_IPV6 |
|
int type = crecp->flags & F_IPV4 ? T_A : T_AAAA; |
int type = crecp->flags & F_IPV4 ? T_A : T_AAAA; |
#else | |
int type = T_A; | |
#endif | |
if (crecp->flags & F_NEG) |
if (crecp->flags & F_NEG) |
continue; |
continue; |
|
|
Line 1827 size_t answer_request(struct dns_header *header, char
|
Line 1949 size_t answer_request(struct dns_header *header, char
|
/* set RA flag */ |
/* set RA flag */ |
header->hb4 |= HB4_RA; |
header->hb4 |= HB4_RA; |
|
|
/* authoritive - only hosts and DHCP derived names. */ | /* authoritative - only hosts and DHCP derived names. */ |
if (auth) |
if (auth) |
header->hb3 |= HB3_AA; |
header->hb3 |= HB3_AA; |
|
|
Line 1837 size_t answer_request(struct dns_header *header, char
|
Line 1959 size_t answer_request(struct dns_header *header, char
|
|
|
if (nxdomain) |
if (nxdomain) |
SET_RCODE(header, NXDOMAIN); |
SET_RCODE(header, NXDOMAIN); |
|
else if (notimp) |
|
SET_RCODE(header, NOTIMP); |
else |
else |
SET_RCODE(header, NOERROR); /* no error */ |
SET_RCODE(header, NOERROR); /* no error */ |
header->ancount = htons(anscount); |
header->ancount = htons(anscount); |