version 1.1.1.1, 2013/07/29 19:37:40
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version 1.1.1.3, 2016/11/02 09:57:01
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/* dnsmasq is Copyright (c) 2000-2013 Simon Kelley | /* dnsmasq is Copyright (c) 2000-2016 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 |
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#include "dnsmasq.h" |
#include "dnsmasq.h" |
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static struct frec *lookup_frec(unsigned short id, unsigned int crc); | static struct frec *lookup_frec(unsigned short id, void *hash); |
static struct frec *lookup_frec_by_sender(unsigned short id, |
static struct frec *lookup_frec_by_sender(unsigned short id, |
union mysockaddr *addr, |
union mysockaddr *addr, |
unsigned int crc); | void *hash); |
static unsigned short get_id(unsigned int crc); | static unsigned short get_id(void); |
static void free_frec(struct frec *f); |
static void free_frec(struct frec *f); |
static struct randfd *allocate_rfd(int family); |
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/* Send a UDP packet with its source address set as "source" |
/* Send a UDP packet with its source address set as "source" |
unless nowild is true, when we just send it with the kernel default */ |
unless nowild is true, when we just send it with the kernel default */ |
Line 95 int send_from(int fd, int nowild, char *packet, size_t
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Line 94 int send_from(int fd, int nowild, char *packet, size_t
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#endif |
#endif |
} |
} |
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while (sendmsg(fd, &msg, 0) == -1) | while (retry_send(sendmsg(fd, &msg, 0))); |
| |
| /* If interface is still in DAD, EINVAL results - ignore that. */ |
| if (errno != 0 && errno != EINVAL) |
{ |
{ |
if (retry_send()) |
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continue; |
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/* If interface is still in DAD, EINVAL results - ignore that. */ |
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if (errno == EINVAL) |
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break; |
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my_syslog(LOG_ERR, _("failed to send packet: %s"), strerror(errno)); |
my_syslog(LOG_ERR, _("failed to send packet: %s"), strerror(errno)); |
return 0; |
return 0; |
} |
} |
Line 111 int send_from(int fd, int nowild, char *packet, size_t
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Line 106 int send_from(int fd, int nowild, char *packet, size_t
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return 1; |
return 1; |
} |
} |
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static unsigned int search_servers(time_t now, struct all_addr **addrpp, | static unsigned int search_servers(time_t now, struct all_addr **addrpp, unsigned int qtype, |
unsigned int qtype, char *qdomain, int *type, char **domain, int *norebind) | char *qdomain, int *type, char **domain, int *norebind) |
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{ |
{ |
/* If the query ends in the domain in one of our servers, set |
/* If the query ends in the domain in one of our servers, set |
Line 156 static unsigned int search_servers(time_t now, struct
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Line 151 static unsigned int search_servers(time_t now, struct
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hostname_isequal(matchstart, serv->domain) && |
hostname_isequal(matchstart, serv->domain) && |
(domainlen == 0 || namelen == domainlen || *(matchstart-1) == '.' )) |
(domainlen == 0 || namelen == domainlen || *(matchstart-1) == '.' )) |
{ |
{ |
if (serv->flags & SERV_NO_REBIND) | if ((serv->flags & SERV_NO_REBIND) && norebind) |
*norebind = 1; |
*norebind = 1; |
else |
else |
{ |
{ |
Line 180 static unsigned int search_servers(time_t now, struct
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Line 175 static unsigned int search_servers(time_t now, struct
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if (domainlen >= matchlen) |
if (domainlen >= matchlen) |
{ |
{ |
*type = serv->flags & (SERV_HAS_DOMAIN | SERV_USE_RESOLV | SERV_NO_REBIND); | *type = serv->flags & (SERV_HAS_DOMAIN | SERV_USE_RESOLV | SERV_NO_REBIND | SERV_DO_DNSSEC); |
*domain = serv->domain; |
*domain = serv->domain; |
matchlen = domainlen; |
matchlen = domainlen; |
if (serv->flags & SERV_NO_ADDR) |
if (serv->flags & SERV_NO_ADDR) |
Line 234 static unsigned int search_servers(time_t now, struct
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Line 229 static unsigned int search_servers(time_t now, struct
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static int forward_query(int udpfd, union mysockaddr *udpaddr, |
static int forward_query(int udpfd, union mysockaddr *udpaddr, |
struct all_addr *dst_addr, unsigned int dst_iface, |
struct all_addr *dst_addr, unsigned int dst_iface, |
struct dns_header *header, size_t plen, time_t now, struct frec *forward) | struct dns_header *header, size_t plen, time_t now, |
| struct frec *forward, int ad_reqd, int do_bit) |
{ |
{ |
char *domain = NULL; |
char *domain = NULL; |
int type = 0, norebind = 0; | int type = SERV_DO_DNSSEC, norebind = 0; |
struct all_addr *addrp = NULL; |
struct all_addr *addrp = NULL; |
unsigned int crc = questions_crc(header, plen, daemon->namebuff); |
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unsigned int flags = 0; |
unsigned int flags = 0; |
unsigned int gotname = extract_request(header, plen, daemon->namebuff, NULL); |
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struct server *start = NULL; |
struct server *start = NULL; |
| #ifdef HAVE_DNSSEC |
/* RFC 4035: sect 4.6 para 2 */ | void *hash = hash_questions(header, plen, daemon->namebuff); |
header->hb4 &= ~HB4_AD; | int do_dnssec = 0; |
| #else |
| unsigned int crc = questions_crc(header, plen, daemon->namebuff); |
| void *hash = &crc; |
| #endif |
| unsigned int gotname = extract_request(header, plen, daemon->namebuff, NULL); |
| |
| (void)do_bit; |
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/* may be no servers available. */ |
/* may be no servers available. */ |
if (!daemon->servers) | if (forward || (hash && (forward = lookup_frec_by_sender(ntohs(header->id), udpaddr, hash)))) |
forward = NULL; | |
else if (forward || (forward = lookup_frec_by_sender(ntohs(header->id), udpaddr, crc))) | |
{ |
{ |
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/* If we didn't get an answer advertising a maximal packet in EDNS, |
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fall back to 1280, which should work everywhere on IPv6. |
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If that generates an answer, it will become the new default |
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for this server */ |
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forward->flags |= FREC_TEST_PKTSZ; |
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#ifdef HAVE_DNSSEC |
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/* If we've already got an answer to this query, but we're awaiting keys for validation, |
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there's no point retrying the query, retry the key query instead...... */ |
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if (forward->blocking_query) |
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{ |
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int fd, is_sign; |
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unsigned char *pheader; |
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forward->flags &= ~FREC_TEST_PKTSZ; |
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while (forward->blocking_query) |
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forward = forward->blocking_query; |
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forward->flags |= FREC_TEST_PKTSZ; |
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blockdata_retrieve(forward->stash, forward->stash_len, (void *)header); |
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plen = forward->stash_len; |
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if (find_pseudoheader(header, plen, NULL, &pheader, &is_sign, NULL) && !is_sign) |
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PUTSHORT(SAFE_PKTSZ, pheader); |
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if (forward->sentto->addr.sa.sa_family == AF_INET) |
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log_query(F_NOEXTRA | F_DNSSEC | F_IPV4, "retry", (struct all_addr *)&forward->sentto->addr.in.sin_addr, "dnssec"); |
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#ifdef HAVE_IPV6 |
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else |
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log_query(F_NOEXTRA | F_DNSSEC | F_IPV6, "retry", (struct all_addr *)&forward->sentto->addr.in6.sin6_addr, "dnssec"); |
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#endif |
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if (forward->sentto->sfd) |
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fd = forward->sentto->sfd->fd; |
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else |
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{ |
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#ifdef HAVE_IPV6 |
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if (forward->sentto->addr.sa.sa_family == AF_INET6) |
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fd = forward->rfd6->fd; |
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else |
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#endif |
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fd = forward->rfd4->fd; |
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} |
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while (retry_send( sendto(fd, (char *)header, plen, 0, |
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&forward->sentto->addr.sa, |
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sa_len(&forward->sentto->addr)))); |
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return 1; |
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} |
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#endif |
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/* retry on existing query, send to all available servers */ |
/* retry on existing query, send to all available servers */ |
domain = forward->sentto->domain; |
domain = forward->sentto->domain; |
forward->sentto->failed_queries++; |
forward->sentto->failed_queries++; |
Line 261 static int forward_query(int udpfd, union mysockaddr *
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Line 314 static int forward_query(int udpfd, union mysockaddr *
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daemon->last_server = NULL; |
daemon->last_server = NULL; |
} |
} |
type = forward->sentto->flags & SERV_TYPE; |
type = forward->sentto->flags & SERV_TYPE; |
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#ifdef HAVE_DNSSEC |
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do_dnssec = forward->sentto->flags & SERV_DO_DNSSEC; |
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#endif |
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if (!(start = forward->sentto->next)) |
if (!(start = forward->sentto->next)) |
start = daemon->servers; /* at end of list, recycle */ |
start = daemon->servers; /* at end of list, recycle */ |
header->id = htons(forward->new_id); |
header->id = htons(forward->new_id); |
Line 270 static int forward_query(int udpfd, union mysockaddr *
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Line 327 static int forward_query(int udpfd, union mysockaddr *
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if (gotname) |
if (gotname) |
flags = search_servers(now, &addrp, gotname, daemon->namebuff, &type, &domain, &norebind); |
flags = search_servers(now, &addrp, gotname, daemon->namebuff, &type, &domain, &norebind); |
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if (!flags && !(forward = get_new_frec(now, NULL))) | #ifdef HAVE_DNSSEC |
/* table full - server failure. */ | do_dnssec = type & SERV_DO_DNSSEC; |
flags = F_NEG; | #endif |
| type &= ~SERV_DO_DNSSEC; |
| |
| if (daemon->servers && !flags) |
| forward = get_new_frec(now, NULL, 0); |
| /* table full - flags == 0, return REFUSED */ |
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if (forward) |
if (forward) |
{ |
{ |
Line 280 static int forward_query(int udpfd, union mysockaddr *
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Line 342 static int forward_query(int udpfd, union mysockaddr *
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forward->dest = *dst_addr; |
forward->dest = *dst_addr; |
forward->iface = dst_iface; |
forward->iface = dst_iface; |
forward->orig_id = ntohs(header->id); |
forward->orig_id = ntohs(header->id); |
forward->new_id = get_id(crc); | forward->new_id = get_id(); |
forward->fd = udpfd; |
forward->fd = udpfd; |
forward->crc = crc; | memcpy(forward->hash, hash, HASH_SIZE); |
forward->forwardall = 0; |
forward->forwardall = 0; |
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forward->flags = 0; |
if (norebind) |
if (norebind) |
forward->flags |= FREC_NOREBIND; |
forward->flags |= FREC_NOREBIND; |
if (header->hb4 & HB4_CD) |
if (header->hb4 & HB4_CD) |
forward->flags |= FREC_CHECKING_DISABLED; |
forward->flags |= FREC_CHECKING_DISABLED; |
| if (ad_reqd) |
| forward->flags |= FREC_AD_QUESTION; |
| #ifdef HAVE_DNSSEC |
| forward->work_counter = DNSSEC_WORK; |
| if (do_bit) |
| forward->flags |= FREC_DO_QUESTION; |
| #endif |
| |
header->id = htons(forward->new_id); |
header->id = htons(forward->new_id); |
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/* In strict_order mode, always try servers in the order |
/* In strict_order mode, always try servers in the order |
Line 326 static int forward_query(int udpfd, union mysockaddr *
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Line 396 static int forward_query(int udpfd, union mysockaddr *
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if (!flags && forward) |
if (!flags && forward) |
{ |
{ |
struct server *firstsentto = start; |
struct server *firstsentto = start; |
int forwarded = 0; | int subnet, forwarded = 0; |
| size_t edns0_len; |
| |
| /* If a query is retried, use the log_id for the retry when logging the answer. */ |
| forward->log_id = daemon->log_id; |
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if (udpaddr && option_bool(OPT_ADD_MAC)) | edns0_len = add_edns0_config(header, plen, ((unsigned char *)header) + PACKETSZ, &forward->source, now, &subnet); |
plen = add_mac(header, plen, ((char *) header) + PACKETSZ, udpaddr); | |
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if (edns0_len != plen) |
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{ |
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plen = edns0_len; |
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forward->flags |= FREC_ADDED_PHEADER; |
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if (subnet) |
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forward->flags |= FREC_HAS_SUBNET; |
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} |
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#ifdef HAVE_DNSSEC |
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if (option_bool(OPT_DNSSEC_VALID) && do_dnssec) |
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{ |
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size_t new = add_do_bit(header, plen, ((unsigned char *) header) + PACKETSZ); |
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if (new != plen) |
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forward->flags |= FREC_ADDED_PHEADER; |
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plen = new; |
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/* For debugging, set Checking Disabled, otherwise, have the upstream check too, |
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this allows it to select auth servers when one is returning bad data. */ |
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if (option_bool(OPT_DNSSEC_DEBUG)) |
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header->hb4 |= HB4_CD; |
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} |
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#endif |
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/* If we're sending an EDNS0 with any options, we can't recreate the query from a reply. */ |
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if (find_pseudoheader(header, plen, &edns0_len, NULL, NULL, NULL) && edns0_len > 11) |
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forward->flags |= FREC_HAS_EXTRADATA; |
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while (1) |
while (1) |
{ |
{ |
/* only send to servers dealing with our domain. |
/* only send to servers dealing with our domain. |
Line 339 static int forward_query(int udpfd, union mysockaddr *
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Line 443 static int forward_query(int udpfd, union mysockaddr *
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if (type == (start->flags & SERV_TYPE) && |
if (type == (start->flags & SERV_TYPE) && |
(type != SERV_HAS_DOMAIN || hostname_isequal(domain, start->domain)) && |
(type != SERV_HAS_DOMAIN || hostname_isequal(domain, start->domain)) && |
!(start->flags & SERV_LITERAL_ADDRESS)) | !(start->flags & (SERV_LITERAL_ADDRESS | SERV_LOOP))) |
{ |
{ |
int fd; |
int fd; |
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Line 372 static int forward_query(int udpfd, union mysockaddr *
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Line 476 static int forward_query(int udpfd, union mysockaddr *
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if (option_bool(OPT_CONNTRACK)) |
if (option_bool(OPT_CONNTRACK)) |
{ |
{ |
unsigned int mark; |
unsigned int mark; |
if (get_incoming_mark(udpaddr, dst_addr, 0, &mark)) | if (get_incoming_mark(&forward->source, &forward->dest, 0, &mark)) |
setsockopt(fd, SOL_SOCKET, SO_MARK, &mark, sizeof(unsigned int)); |
setsockopt(fd, SOL_SOCKET, SO_MARK, &mark, sizeof(unsigned int)); |
} |
} |
#endif |
#endif |
} |
} |
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if (sendto(fd, (char *)header, plen, 0, | #ifdef HAVE_DNSSEC |
&start->addr.sa, | if (option_bool(OPT_DNSSEC_VALID) && (forward->flags & FREC_ADDED_PHEADER)) |
sa_len(&start->addr)) == -1) | |
{ |
{ |
if (retry_send()) | /* Difficult one here. If our client didn't send EDNS0, we will have set the UDP |
continue; | packet size to 512. But that won't provide space for the RRSIGS in many cases. |
| The RRSIGS will be stripped out before the answer goes back, so the packet should |
| shrink again. So, if we added a do-bit, bump the udp packet size to the value |
| known to be OK for this server. We check returned size after stripping and set |
| the truncated bit if it's still too big. */ |
| unsigned char *pheader; |
| int is_sign; |
| if (find_pseudoheader(header, plen, NULL, &pheader, &is_sign, NULL) && !is_sign) |
| PUTSHORT(start->edns_pktsz, pheader); |
} |
} |
else | #endif |
| |
| if (retry_send(sendto(fd, (char *)header, plen, 0, |
| &start->addr.sa, |
| sa_len(&start->addr)))) |
| continue; |
| |
| if (errno == 0) |
{ |
{ |
/* Keep info in case we want to re-send this packet */ |
/* Keep info in case we want to re-send this packet */ |
daemon->srv_save = start; |
daemon->srv_save = start; |
Line 435 static int forward_query(int udpfd, union mysockaddr *
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Line 553 static int forward_query(int udpfd, union mysockaddr *
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return 0; |
return 0; |
} |
} |
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static size_t process_reply(struct dns_header *header, time_t now, | static size_t process_reply(struct dns_header *header, time_t now, struct server *server, size_t n, int check_rebind, |
struct server *server, size_t n, int check_rebind, int checking_disabled) | int no_cache, int cache_secure, int bogusanswer, int ad_reqd, int do_bit, int added_pheader, |
| int check_subnet, union mysockaddr *query_source) |
{ |
{ |
unsigned char *pheader, *sizep; |
unsigned char *pheader, *sizep; |
char **sets = 0; |
char **sets = 0; |
int munged = 0, is_sign; |
int munged = 0, is_sign; |
size_t plen; |
size_t plen; |
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(void)ad_reqd; |
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(void)do_bit; |
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(void)bogusanswer; |
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#ifdef HAVE_IPSET |
#ifdef HAVE_IPSET |
/* Similar algorithm to search_servers. */ | if (daemon->ipsets && extract_request(header, n, daemon->namebuff, NULL)) |
struct ipsets *ipset_pos; | |
unsigned int namelen = strlen(daemon->namebuff); | |
unsigned int matchlen = 0; | |
for (ipset_pos = daemon->ipsets; ipset_pos; ipset_pos = ipset_pos->next) | |
{ |
{ |
unsigned int domainlen = strlen(ipset_pos->domain); | /* Similar algorithm to search_servers. */ |
char *matchstart = daemon->namebuff + namelen - domainlen; | struct ipsets *ipset_pos; |
if (namelen >= domainlen && hostname_isequal(matchstart, ipset_pos->domain) && | unsigned int namelen = strlen(daemon->namebuff); |
(domainlen == 0 || namelen == domainlen || *(matchstart - 1) == '.' ) && | unsigned int matchlen = 0; |
domainlen >= matchlen) { | for (ipset_pos = daemon->ipsets; ipset_pos; ipset_pos = ipset_pos->next) |
matchlen = domainlen; | { |
sets = ipset_pos->sets; | unsigned int domainlen = strlen(ipset_pos->domain); |
} | char *matchstart = daemon->namebuff + namelen - domainlen; |
| if (namelen >= domainlen && hostname_isequal(matchstart, ipset_pos->domain) && |
| (domainlen == 0 || namelen == domainlen || *(matchstart - 1) == '.' ) && |
| domainlen >= matchlen) |
| { |
| matchlen = domainlen; |
| sets = ipset_pos->sets; |
| } |
| } |
} |
} |
#endif |
#endif |
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/* If upstream is advertising a larger UDP packet size | if ((pheader = find_pseudoheader(header, n, &plen, &sizep, &is_sign, NULL))) |
than we allow, trim it so that we don't get overlarge | |
requests for the client. We can't do this for signed packets. */ | |
| |
if ((pheader = find_pseudoheader(header, n, &plen, &sizep, &is_sign)) && !is_sign) | |
{ |
{ |
unsigned short udpsz; | if (check_subnet && !check_source(header, plen, pheader, query_source)) |
unsigned char *psave = sizep; | { |
| my_syslog(LOG_WARNING, _("discarding DNS reply: subnet option mismatch")); |
| return 0; |
| } |
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GETSHORT(udpsz, sizep); | if (!is_sign) |
if (udpsz > daemon->edns_pktsz) | { |
PUTSHORT(daemon->edns_pktsz, psave); | if (added_pheader) |
} | { |
| /* client didn't send EDNS0, we added one, strip it off before returning answer. */ |
| n = rrfilter(header, n, 0); |
| pheader = NULL; |
| } |
| else |
| { |
| unsigned short udpsz; |
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/* If upstream is advertising a larger UDP packet size |
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than we allow, trim it so that we don't get overlarge |
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requests for the client. We can't do this for signed packets. */ |
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GETSHORT(udpsz, sizep); |
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if (udpsz > daemon->edns_pktsz) |
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{ |
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sizep -= 2; |
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PUTSHORT(daemon->edns_pktsz, sizep); |
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} |
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#ifdef HAVE_DNSSEC |
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/* If the client didn't set the do bit, but we did, reset it. */ |
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if (option_bool(OPT_DNSSEC_VALID) && !do_bit) |
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{ |
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unsigned short flags; |
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sizep += 2; /* skip RCODE */ |
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GETSHORT(flags, sizep); |
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flags &= ~0x8000; |
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sizep -= 2; |
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PUTSHORT(flags, sizep); |
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} |
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#endif |
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} |
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} |
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} |
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/* RFC 4035 sect 4.6 para 3 */ |
/* RFC 4035 sect 4.6 para 3 */ |
if (!is_sign && !option_bool(OPT_DNSSEC)) | if (!is_sign && !option_bool(OPT_DNSSEC_PROXY)) |
header->hb4 &= ~HB4_AD; |
header->hb4 &= ~HB4_AD; |
| |
if (OPCODE(header) != QUERY || (RCODE(header) != NOERROR && RCODE(header) != NXDOMAIN)) |
if (OPCODE(header) != QUERY || (RCODE(header) != NOERROR && RCODE(header) != NXDOMAIN)) |
return n; | return resize_packet(header, n, pheader, plen); |
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/* Complain loudly if the upstream server is non-recursive. */ |
/* Complain loudly if the upstream server is non-recursive. */ |
if (!(header->hb4 & HB4_RA) && RCODE(header) == NOERROR && ntohs(header->ancount) == 0 && | if (!(header->hb4 & HB4_RA) && RCODE(header) == NOERROR && |
server && !(server->flags & SERV_WARNED_RECURSIVE)) |
server && !(server->flags & SERV_WARNED_RECURSIVE)) |
{ |
{ |
prettyprint_addr(&server->addr, daemon->namebuff); |
prettyprint_addr(&server->addr, daemon->namebuff); |
Line 491 static size_t process_reply(struct dns_header *header,
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Line 650 static size_t process_reply(struct dns_header *header,
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if (!option_bool(OPT_LOG)) |
if (!option_bool(OPT_LOG)) |
server->flags |= SERV_WARNED_RECURSIVE; |
server->flags |= SERV_WARNED_RECURSIVE; |
} |
} |
| |
if (daemon->bogus_addr && RCODE(header) != NXDOMAIN && |
if (daemon->bogus_addr && RCODE(header) != NXDOMAIN && |
check_for_bogus_wildcard(header, n, daemon->namebuff, daemon->bogus_addr, now)) |
check_for_bogus_wildcard(header, n, daemon->namebuff, daemon->bogus_addr, now)) |
{ |
{ |
munged = 1; |
munged = 1; |
SET_RCODE(header, NXDOMAIN); |
SET_RCODE(header, NXDOMAIN); |
header->hb3 &= ~HB3_AA; |
header->hb3 &= ~HB3_AA; |
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cache_secure = 0; |
} |
} |
else |
else |
{ |
{ |
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int doctored = 0; |
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if (RCODE(header) == NXDOMAIN && |
if (RCODE(header) == NXDOMAIN && |
extract_request(header, n, daemon->namebuff, NULL) && |
extract_request(header, n, daemon->namebuff, NULL) && |
check_for_local_domain(daemon->namebuff, now)) |
check_for_local_domain(daemon->namebuff, now)) |
Line 511 static size_t process_reply(struct dns_header *header,
|
Line 673 static size_t process_reply(struct dns_header *header,
|
munged = 1; |
munged = 1; |
header->hb3 |= HB3_AA; |
header->hb3 |= HB3_AA; |
SET_RCODE(header, NOERROR); |
SET_RCODE(header, NOERROR); |
|
cache_secure = 0; |
} |
} |
|
|
if (extract_addresses(header, n, daemon->namebuff, now, sets, is_sign, check_rebind, checking_disabled)) | if (extract_addresses(header, n, daemon->namebuff, now, sets, is_sign, check_rebind, no_cache, cache_secure, &doctored)) |
{ |
{ |
my_syslog(LOG_WARNING, _("possible DNS-rebind attack detected: %s"), daemon->namebuff); |
my_syslog(LOG_WARNING, _("possible DNS-rebind attack detected: %s"), daemon->namebuff); |
munged = 1; |
munged = 1; |
|
cache_secure = 0; |
} |
} |
|
|
|
if (doctored) |
|
cache_secure = 0; |
} |
} |
|
|
|
#ifdef HAVE_DNSSEC |
|
if (bogusanswer && !(header->hb4 & HB4_CD) && !option_bool(OPT_DNSSEC_DEBUG)) |
|
{ |
|
/* Bogus reply, turn into SERVFAIL */ |
|
SET_RCODE(header, SERVFAIL); |
|
munged = 1; |
|
} |
|
|
|
if (option_bool(OPT_DNSSEC_VALID)) |
|
{ |
|
header->hb4 &= ~HB4_AD; |
|
|
|
if (!(header->hb4 & HB4_CD) && ad_reqd && cache_secure) |
|
header->hb4 |= HB4_AD; |
|
|
|
/* If the requestor didn't set the DO bit, don't return DNSSEC info. */ |
|
if (!do_bit) |
|
n = rrfilter(header, n, 1); |
|
} |
|
#endif |
|
|
/* do this after extract_addresses. Ensure NODATA reply and remove |
/* do this after extract_addresses. Ensure NODATA reply and remove |
nameserver info. */ |
nameserver info. */ |
|
|
Line 528 static size_t process_reply(struct dns_header *header,
|
Line 716 static size_t process_reply(struct dns_header *header,
|
header->ancount = htons(0); |
header->ancount = htons(0); |
header->nscount = htons(0); |
header->nscount = htons(0); |
header->arcount = htons(0); |
header->arcount = htons(0); |
|
header->hb3 &= ~HB3_TC; |
} |
} |
|
|
/* the bogus-nxdomain stuff, doctor and NXDOMAIN->NODATA munging can all elide |
/* the bogus-nxdomain stuff, doctor and NXDOMAIN->NODATA munging can all elide |
Line 545 void reply_query(int fd, int family, time_t now)
|
Line 734 void reply_query(int fd, int family, time_t now)
|
union mysockaddr serveraddr; |
union mysockaddr serveraddr; |
struct frec *forward; |
struct frec *forward; |
socklen_t addrlen = sizeof(serveraddr); |
socklen_t addrlen = sizeof(serveraddr); |
ssize_t n = recvfrom(fd, daemon->packet, daemon->edns_pktsz, 0, &serveraddr.sa, &addrlen); | ssize_t n = recvfrom(fd, daemon->packet, daemon->packet_buff_sz, 0, &serveraddr.sa, &addrlen); |
size_t nn; |
size_t nn; |
struct server *server; |
struct server *server; |
| void *hash; |
| #ifndef HAVE_DNSSEC |
| unsigned int crc; |
| #endif |
| |
/* packet buffer overwritten */ |
/* packet buffer overwritten */ |
daemon->srv_save = NULL; |
daemon->srv_save = NULL; |
|
|
Line 559 void reply_query(int fd, int family, time_t now)
|
Line 752 void reply_query(int fd, int family, time_t now)
|
serveraddr.in6.sin6_flowinfo = 0; |
serveraddr.in6.sin6_flowinfo = 0; |
#endif |
#endif |
|
|
|
header = (struct dns_header *)daemon->packet; |
|
|
|
if (n < (int)sizeof(struct dns_header) || !(header->hb3 & HB3_QR)) |
|
return; |
|
|
/* spoof check: answer must come from known server, */ |
/* spoof check: answer must come from known server, */ |
for (server = daemon->servers; server; server = server->next) |
for (server = daemon->servers; server; server = server->next) |
if (!(server->flags & (SERV_LITERAL_ADDRESS | SERV_NO_ADDR)) && |
if (!(server->flags & (SERV_LITERAL_ADDRESS | SERV_NO_ADDR)) && |
sockaddr_isequal(&server->addr, &serveraddr)) |
sockaddr_isequal(&server->addr, &serveraddr)) |
break; |
break; |
|
|
header = (struct dns_header *)daemon->packet; |
|
|
|
if (!server || | if (!server) |
n < (int)sizeof(struct dns_header) || !(header->hb3 & HB3_QR) || | |
!(forward = lookup_frec(ntohs(header->id), questions_crc(header, n, daemon->namebuff)))) | |
return; |
return; |
|
|
server = forward->sentto; |
|
|
|
if ((RCODE(header) == SERVFAIL || RCODE(header) == REFUSED) && | #ifdef HAVE_DNSSEC |
| hash = hash_questions(header, n, daemon->namebuff); |
| #else |
| hash = &crc; |
| crc = questions_crc(header, n, daemon->namebuff); |
| #endif |
| |
| if (!(forward = lookup_frec(ntohs(header->id), hash))) |
| return; |
| |
| /* log_query gets called indirectly all over the place, so |
| pass these in global variables - sorry. */ |
| daemon->log_display_id = forward->log_id; |
| daemon->log_source_addr = &forward->source; |
| |
| if (daemon->ignore_addr && RCODE(header) == NOERROR && |
| check_for_ignored_address(header, n, daemon->ignore_addr)) |
| return; |
| |
| /* Note: if we send extra options in the EDNS0 header, we can't recreate |
| the query from the reply. */ |
| if (RCODE(header) == REFUSED && |
!option_bool(OPT_ORDER) && |
!option_bool(OPT_ORDER) && |
forward->forwardall == 0) | forward->forwardall == 0 && |
| !(forward->flags & FREC_HAS_EXTRADATA)) |
/* for broken servers, attempt to send to another one. */ |
/* for broken servers, attempt to send to another one. */ |
{ |
{ |
unsigned char *pheader; |
unsigned char *pheader; |
Line 584 void reply_query(int fd, int family, time_t now)
|
Line 798 void reply_query(int fd, int family, time_t now)
|
int is_sign; |
int is_sign; |
|
|
/* recreate query from reply */ |
/* recreate query from reply */ |
pheader = find_pseudoheader(header, (size_t)n, &plen, NULL, &is_sign); | pheader = find_pseudoheader(header, (size_t)n, &plen, NULL, &is_sign, NULL); |
if (!is_sign) |
if (!is_sign) |
{ |
{ |
header->ancount = htons(0); |
header->ancount = htons(0); |
Line 592 void reply_query(int fd, int family, time_t now)
|
Line 806 void reply_query(int fd, int family, time_t now)
|
header->arcount = htons(0); |
header->arcount = htons(0); |
if ((nn = resize_packet(header, (size_t)n, pheader, plen))) |
if ((nn = resize_packet(header, (size_t)n, pheader, plen))) |
{ |
{ |
header->hb3 &= ~(HB3_QR | HB3_TC); | header->hb3 &= ~(HB3_QR | HB3_AA | HB3_TC); |
forward_query(-1, NULL, NULL, 0, header, nn, now, forward); | header->hb4 &= ~(HB4_RA | HB4_RCODE | HB4_CD | HB4_AD); |
| if (forward->flags & FREC_CHECKING_DISABLED) |
| header->hb4 |= HB4_CD; |
| if (forward->flags & FREC_AD_QUESTION) |
| header->hb4 |= HB4_AD; |
| if (forward->flags & FREC_DO_QUESTION) |
| add_do_bit(header, nn, (unsigned char *)pheader + plen); |
| forward_query(-1, NULL, NULL, 0, header, nn, now, forward, forward->flags & FREC_AD_QUESTION, forward->flags & FREC_DO_QUESTION); |
return; |
return; |
} |
} |
} |
} |
} |
} |
| |
| server = forward->sentto; |
if ((forward->sentto->flags & SERV_TYPE) == 0) |
if ((forward->sentto->flags & SERV_TYPE) == 0) |
{ |
{ |
if (RCODE(header) == SERVFAIL || RCODE(header) == REFUSED) | if (RCODE(header) == REFUSED) |
server = NULL; |
server = NULL; |
else |
else |
{ |
{ |
Line 619 void reply_query(int fd, int family, time_t now)
|
Line 841 void reply_query(int fd, int family, time_t now)
|
if (!option_bool(OPT_ALL_SERVERS)) |
if (!option_bool(OPT_ALL_SERVERS)) |
daemon->last_server = server; |
daemon->last_server = server; |
} |
} |
|
|
|
/* We tried resending to this server with a smaller maximum size and got an answer. |
|
Make that permanent. To avoid reduxing the packet size for an single dropped packet, |
|
only do this when we get a truncated answer, or one larger than the safe size. */ |
|
if (server && (forward->flags & FREC_TEST_PKTSZ) && |
|
((header->hb3 & HB3_TC) || n >= SAFE_PKTSZ)) |
|
server->edns_pktsz = SAFE_PKTSZ; |
|
|
/* If the answer is an error, keep the forward record in place in case |
/* If the answer is an error, keep the forward record in place in case |
we get a good reply from another server. Kill it when we've |
we get a good reply from another server. Kill it when we've |
had replies from all to avoid filling the forwarding table when |
had replies from all to avoid filling the forwarding table when |
everything is broken */ |
everything is broken */ |
if (forward->forwardall == 0 || --forward->forwardall == 1 || | if (forward->forwardall == 0 || --forward->forwardall == 1 || RCODE(header) != REFUSED) |
(RCODE(header) != REFUSED && RCODE(header) != SERVFAIL)) | |
{ |
{ |
int check_rebind = !(forward->flags & FREC_NOREBIND); | int check_rebind = 0, no_cache_dnssec = 0, cache_secure = 0, bogusanswer = 0; |
|
|
if (!option_bool(OPT_NO_REBIND)) | if (option_bool(OPT_NO_REBIND)) |
check_rebind = 0; | check_rebind = !(forward->flags & FREC_NOREBIND); |
|
|
if ((nn = process_reply(header, now, server, (size_t)n, check_rebind, forward->flags & FREC_CHECKING_DISABLED))) | /* Don't cache replies where DNSSEC validation was turned off, either |
| the upstream server told us so, or the original query specified it. */ |
| if ((header->hb4 & HB4_CD) || (forward->flags & FREC_CHECKING_DISABLED)) |
| no_cache_dnssec = 1; |
| |
| #ifdef HAVE_DNSSEC |
| if (server && (server->flags & SERV_DO_DNSSEC) && |
| option_bool(OPT_DNSSEC_VALID) && !(forward->flags & FREC_CHECKING_DISABLED)) |
{ |
{ |
|
int status = 0; |
|
|
|
/* We've had a reply already, which we're validating. Ignore this duplicate */ |
|
if (forward->blocking_query) |
|
return; |
|
|
|
/* Truncated answer can't be validated. |
|
If this is an answer to a DNSSEC-generated query, we still |
|
need to get the client to retry over TCP, so return |
|
an answer with the TC bit set, even if the actual answer fits. |
|
*/ |
|
if (header->hb3 & HB3_TC) |
|
status = STAT_TRUNCATED; |
|
|
|
while (1) |
|
{ |
|
/* As soon as anything returns BOGUS, we stop and unwind, to do otherwise |
|
would invite infinite loops, since the answers to DNSKEY and DS queries |
|
will not be cached, so they'll be repeated. */ |
|
if (status != STAT_BOGUS && status != STAT_TRUNCATED && status != STAT_ABANDONED) |
|
{ |
|
if (forward->flags & FREC_DNSKEY_QUERY) |
|
status = dnssec_validate_by_ds(now, header, n, daemon->namebuff, daemon->keyname, forward->class); |
|
else if (forward->flags & FREC_DS_QUERY) |
|
status = dnssec_validate_ds(now, header, n, daemon->namebuff, daemon->keyname, forward->class); |
|
else |
|
status = dnssec_validate_reply(now, header, n, daemon->namebuff, daemon->keyname, &forward->class, |
|
option_bool(OPT_DNSSEC_NO_SIGN), NULL, NULL); |
|
} |
|
|
|
/* Can't validate, as we're missing key data. Put this |
|
answer aside, whilst we get that. */ |
|
if (status == STAT_NEED_DS || status == STAT_NEED_KEY) |
|
{ |
|
struct frec *new, *orig; |
|
|
|
/* Free any saved query */ |
|
if (forward->stash) |
|
blockdata_free(forward->stash); |
|
|
|
/* Now save reply pending receipt of key data */ |
|
if (!(forward->stash = blockdata_alloc((char *)header, n))) |
|
return; |
|
forward->stash_len = n; |
|
|
|
/* Find the original query that started it all.... */ |
|
for (orig = forward; orig->dependent; orig = orig->dependent); |
|
|
|
if (--orig->work_counter == 0 || !(new = get_new_frec(now, NULL, 1))) |
|
status = STAT_ABANDONED; |
|
else |
|
{ |
|
int fd, type = SERV_DO_DNSSEC; |
|
struct frec *next = new->next; |
|
char *domain; |
|
|
|
*new = *forward; /* copy everything, then overwrite */ |
|
new->next = next; |
|
new->blocking_query = NULL; |
|
|
|
/* Find server to forward to. This will normally be the |
|
same as for the original query, but may be another if |
|
servers for domains are involved. */ |
|
if (search_servers(now, NULL, F_QUERY, daemon->keyname, &type, &domain, NULL) == 0) |
|
{ |
|
struct server *start = server, *new_server = NULL; |
|
type &= ~SERV_DO_DNSSEC; |
|
|
|
while (1) |
|
{ |
|
if (type == (start->flags & SERV_TYPE) && |
|
(type != SERV_HAS_DOMAIN || hostname_isequal(domain, start->domain)) && |
|
!(start->flags & (SERV_LITERAL_ADDRESS | SERV_LOOP))) |
|
{ |
|
new_server = start; |
|
if (server == start) |
|
{ |
|
new_server = NULL; |
|
break; |
|
} |
|
} |
|
|
|
if (!(start = start->next)) |
|
start = daemon->servers; |
|
if (start == server) |
|
break; |
|
} |
|
|
|
if (new_server) |
|
server = new_server; |
|
} |
|
|
|
new->sentto = server; |
|
|
|
new->rfd4 = NULL; |
|
#ifdef HAVE_IPV6 |
|
new->rfd6 = NULL; |
|
#endif |
|
new->flags &= ~(FREC_DNSKEY_QUERY | FREC_DS_QUERY); |
|
|
|
new->dependent = forward; /* to find query awaiting new one. */ |
|
forward->blocking_query = new; /* for garbage cleaning */ |
|
/* validate routines leave name of required record in daemon->keyname */ |
|
if (status == STAT_NEED_KEY) |
|
{ |
|
new->flags |= FREC_DNSKEY_QUERY; |
|
nn = dnssec_generate_query(header, ((unsigned char *) header) + server->edns_pktsz, |
|
daemon->keyname, forward->class, T_DNSKEY, &server->addr, server->edns_pktsz); |
|
} |
|
else |
|
{ |
|
new->flags |= FREC_DS_QUERY; |
|
nn = dnssec_generate_query(header,((unsigned char *) header) + server->edns_pktsz, |
|
daemon->keyname, forward->class, T_DS, &server->addr, server->edns_pktsz); |
|
} |
|
if ((hash = hash_questions(header, nn, daemon->namebuff))) |
|
memcpy(new->hash, hash, HASH_SIZE); |
|
new->new_id = get_id(); |
|
header->id = htons(new->new_id); |
|
/* Save query for retransmission */ |
|
new->stash = blockdata_alloc((char *)header, nn); |
|
new->stash_len = nn; |
|
|
|
/* Don't resend this. */ |
|
daemon->srv_save = NULL; |
|
|
|
if (server->sfd) |
|
fd = server->sfd->fd; |
|
else |
|
{ |
|
fd = -1; |
|
#ifdef HAVE_IPV6 |
|
if (server->addr.sa.sa_family == AF_INET6) |
|
{ |
|
if (new->rfd6 || (new->rfd6 = allocate_rfd(AF_INET6))) |
|
fd = new->rfd6->fd; |
|
} |
|
else |
|
#endif |
|
{ |
|
if (new->rfd4 || (new->rfd4 = allocate_rfd(AF_INET))) |
|
fd = new->rfd4->fd; |
|
} |
|
} |
|
|
|
if (fd != -1) |
|
{ |
|
#ifdef HAVE_CONNTRACK |
|
/* Copy connection mark of incoming query to outgoing connection. */ |
|
if (option_bool(OPT_CONNTRACK)) |
|
{ |
|
unsigned int mark; |
|
if (get_incoming_mark(&orig->source, &orig->dest, 0, &mark)) |
|
setsockopt(fd, SOL_SOCKET, SO_MARK, &mark, sizeof(unsigned int)); |
|
} |
|
#endif |
|
while (retry_send(sendto(fd, (char *)header, nn, 0, |
|
&server->addr.sa, |
|
sa_len(&server->addr)))); |
|
server->queries++; |
|
} |
|
} |
|
return; |
|
} |
|
|
|
/* Validated original answer, all done. */ |
|
if (!forward->dependent) |
|
break; |
|
|
|
/* validated subsdiary query, (and cached result) |
|
pop that and return to the previous query we were working on. */ |
|
struct frec *prev = forward->dependent; |
|
free_frec(forward); |
|
forward = prev; |
|
forward->blocking_query = NULL; /* already gone */ |
|
blockdata_retrieve(forward->stash, forward->stash_len, (void *)header); |
|
n = forward->stash_len; |
|
} |
|
|
|
|
|
no_cache_dnssec = 0; |
|
|
|
if (status == STAT_TRUNCATED) |
|
header->hb3 |= HB3_TC; |
|
else |
|
{ |
|
char *result, *domain = "result"; |
|
|
|
if (status == STAT_ABANDONED) |
|
{ |
|
result = "ABANDONED"; |
|
status = STAT_BOGUS; |
|
} |
|
else |
|
result = (status == STAT_SECURE ? "SECURE" : (status == STAT_INSECURE ? "INSECURE" : "BOGUS")); |
|
|
|
if (status == STAT_BOGUS && extract_request(header, n, daemon->namebuff, NULL)) |
|
domain = daemon->namebuff; |
|
|
|
log_query(F_KEYTAG | F_SECSTAT, domain, NULL, result); |
|
} |
|
|
|
if (status == STAT_SECURE) |
|
cache_secure = 1; |
|
else if (status == STAT_BOGUS) |
|
{ |
|
no_cache_dnssec = 1; |
|
bogusanswer = 1; |
|
} |
|
} |
|
#endif |
|
|
|
/* restore CD bit to the value in the query */ |
|
if (forward->flags & FREC_CHECKING_DISABLED) |
|
header->hb4 |= HB4_CD; |
|
else |
|
header->hb4 &= ~HB4_CD; |
|
|
|
if ((nn = process_reply(header, now, forward->sentto, (size_t)n, check_rebind, no_cache_dnssec, cache_secure, bogusanswer, |
|
forward->flags & FREC_AD_QUESTION, forward->flags & FREC_DO_QUESTION, |
|
forward->flags & FREC_ADDED_PHEADER, forward->flags & FREC_HAS_SUBNET, &forward->source))) |
|
{ |
header->id = htons(forward->orig_id); |
header->id = htons(forward->orig_id); |
header->hb4 |= HB4_RA; /* recursion if available */ |
header->hb4 |= HB4_RA; /* recursion if available */ |
|
#ifdef HAVE_DNSSEC |
|
/* We added an EDNSO header for the purpose of getting DNSSEC RRs, and set the value of the UDP payload size |
|
greater than the no-EDNS0-implied 512 to have if space for the RRSIGS. If, having stripped them and the EDNS0 |
|
header, the answer is still bigger than 512, truncate it and mark it so. The client then retries with TCP. */ |
|
if (option_bool(OPT_DNSSEC_VALID) && (forward->flags & FREC_ADDED_PHEADER) && (nn > PACKETSZ)) |
|
{ |
|
header->ancount = htons(0); |
|
header->nscount = htons(0); |
|
header->arcount = htons(0); |
|
header->hb3 |= HB3_TC; |
|
nn = resize_packet(header, nn, NULL, 0); |
|
} |
|
#endif |
send_from(forward->fd, option_bool(OPT_NOWILD) || option_bool (OPT_CLEVERBIND), daemon->packet, nn, |
send_from(forward->fd, option_bool(OPT_NOWILD) || option_bool (OPT_CLEVERBIND), daemon->packet, nn, |
&forward->source, &forward->dest, forward->iface); |
&forward->source, &forward->dest, forward->iface); |
} |
} |
Line 648 void receive_query(struct listener *listen, time_t now
|
Line 1118 void receive_query(struct listener *listen, time_t now
|
{ |
{ |
struct dns_header *header = (struct dns_header *)daemon->packet; |
struct dns_header *header = (struct dns_header *)daemon->packet; |
union mysockaddr source_addr; |
union mysockaddr source_addr; |
unsigned short type; | unsigned char *pheader; |
| unsigned short type, udp_size = PACKETSZ; /* default if no EDNS0 */ |
struct all_addr dst_addr; |
struct all_addr dst_addr; |
struct in_addr netmask, dst_addr_4; |
struct in_addr netmask, dst_addr_4; |
size_t m; |
size_t m; |
ssize_t n; |
ssize_t n; |
int if_index = 0; | int if_index = 0, auth_dns = 0, do_bit = 0, have_pseudoheader = 0; |
int auth_dns = 0; | #ifdef HAVE_AUTH |
| int local_auth = 0; |
| #endif |
struct iovec iov[1]; |
struct iovec iov[1]; |
struct msghdr msg; |
struct msghdr msg; |
struct cmsghdr *cmptr; |
struct cmsghdr *cmptr; |
Line 673 void receive_query(struct listener *listen, time_t now
|
Line 1146 void receive_query(struct listener *listen, time_t now
|
CMSG_SPACE(sizeof(struct sockaddr_dl))]; |
CMSG_SPACE(sizeof(struct sockaddr_dl))]; |
#endif |
#endif |
} control_u; |
} control_u; |
| #ifdef HAVE_IPV6 |
| /* Can always get recvd interface for IPv6 */ |
| int check_dst = !option_bool(OPT_NOWILD) || listen->family == AF_INET6; |
| #else |
| int check_dst = !option_bool(OPT_NOWILD); |
| #endif |
| |
/* packet buffer overwritten */ |
/* packet buffer overwritten */ |
daemon->srv_save = NULL; |
daemon->srv_save = NULL; |
|
|
dst_addr_4.s_addr = 0; | dst_addr_4.s_addr = dst_addr.addr.addr4.s_addr = 0; |
netmask.s_addr = 0; |
netmask.s_addr = 0; |
|
|
if (option_bool(OPT_NOWILD) && listen->iface) |
if (option_bool(OPT_NOWILD) && listen->iface) |
Line 686 void receive_query(struct listener *listen, time_t now
|
Line 1165 void receive_query(struct listener *listen, time_t now
|
|
|
if (listen->family == AF_INET) |
if (listen->family == AF_INET) |
{ |
{ |
dst_addr_4 = listen->iface->addr.in.sin_addr; | dst_addr_4 = dst_addr.addr.addr4 = listen->iface->addr.in.sin_addr; |
netmask = listen->iface->netmask; |
netmask = listen->iface->netmask; |
} |
} |
} |
} |
Line 711 void receive_query(struct listener *listen, time_t now
|
Line 1190 void receive_query(struct listener *listen, time_t now
|
return; |
return; |
|
|
source_addr.sa.sa_family = listen->family; |
source_addr.sa.sa_family = listen->family; |
|
|
|
if (listen->family == AF_INET) |
|
{ |
|
/* Source-port == 0 is an error, we can't send back to that. |
|
http://www.ietf.org/mail-archive/web/dnsop/current/msg11441.html */ |
|
if (source_addr.in.sin_port == 0) |
|
return; |
|
} |
#ifdef HAVE_IPV6 |
#ifdef HAVE_IPV6 |
if (listen->family == AF_INET6) | else |
source_addr.in6.sin6_flowinfo = 0; | { |
| /* Source-port == 0 is an error, we can't send back to that. */ |
| if (source_addr.in6.sin6_port == 0) |
| return; |
| source_addr.in6.sin6_flowinfo = 0; |
| } |
#endif |
#endif |
| |
if (!option_bool(OPT_NOWILD)) | /* We can be configured to only accept queries from at-most-one-hop-away addresses. */ |
| if (option_bool(OPT_LOCAL_SERVICE)) |
{ |
{ |
|
struct addrlist *addr; |
|
#ifdef HAVE_IPV6 |
|
if (listen->family == AF_INET6) |
|
{ |
|
for (addr = daemon->interface_addrs; addr; addr = addr->next) |
|
if ((addr->flags & ADDRLIST_IPV6) && |
|
is_same_net6(&addr->addr.addr.addr6, &source_addr.in6.sin6_addr, addr->prefixlen)) |
|
break; |
|
} |
|
else |
|
#endif |
|
{ |
|
struct in_addr netmask; |
|
for (addr = daemon->interface_addrs; addr; addr = addr->next) |
|
{ |
|
netmask.s_addr = htonl(~(in_addr_t)0 << (32 - addr->prefixlen)); |
|
if (!(addr->flags & ADDRLIST_IPV6) && |
|
is_same_net(addr->addr.addr.addr4, source_addr.in.sin_addr, netmask)) |
|
break; |
|
} |
|
} |
|
if (!addr) |
|
{ |
|
static int warned = 0; |
|
if (!warned) |
|
{ |
|
my_syslog(LOG_WARNING, _("Ignoring query from non-local network")); |
|
warned = 1; |
|
} |
|
return; |
|
} |
|
} |
|
|
|
if (check_dst) |
|
{ |
struct ifreq ifr; |
struct ifreq ifr; |
|
|
if (msg.msg_controllen < sizeof(struct cmsghdr)) |
if (msg.msg_controllen < sizeof(struct cmsghdr)) |
Line 788 void receive_query(struct listener *listen, time_t now
|
Line 1316 void receive_query(struct listener *listen, time_t now
|
if (!iface_check(listen->family, &dst_addr, ifr.ifr_name, &auth_dns)) |
if (!iface_check(listen->family, &dst_addr, ifr.ifr_name, &auth_dns)) |
{ |
{ |
if (!option_bool(OPT_CLEVERBIND)) |
if (!option_bool(OPT_CLEVERBIND)) |
enumerate_interfaces(); | enumerate_interfaces(0); |
if (!loopback_exception(listen->fd, listen->family, &dst_addr, ifr.ifr_name)) | if (!loopback_exception(listen->fd, listen->family, &dst_addr, ifr.ifr_name) && |
| !label_exception(if_index, listen->family, &dst_addr)) |
return; |
return; |
} |
} |
|
|
Line 807 void receive_query(struct listener *listen, time_t now
|
Line 1336 void receive_query(struct listener *listen, time_t now
|
|
|
/* interface may be new */ |
/* interface may be new */ |
if (!iface && !option_bool(OPT_CLEVERBIND)) |
if (!iface && !option_bool(OPT_CLEVERBIND)) |
enumerate_interfaces(); | enumerate_interfaces(0); |
|
|
for (iface = daemon->interfaces; iface; iface = iface->next) |
for (iface = daemon->interfaces; iface; iface = iface->next) |
if (iface->addr.sa.sa_family == AF_INET && |
if (iface->addr.sa.sa_family == AF_INET && |
Line 821 void receive_query(struct listener *listen, time_t now
|
Line 1350 void receive_query(struct listener *listen, time_t now
|
dst_addr_4.s_addr = 0; |
dst_addr_4.s_addr = 0; |
} |
} |
} |
} |
|
|
|
/* log_query gets called indirectly all over the place, so |
|
pass these in global variables - sorry. */ |
|
daemon->log_display_id = ++daemon->log_id; |
|
daemon->log_source_addr = &source_addr; |
|
|
if (extract_request(header, (size_t)n, daemon->namebuff, &type)) |
if (extract_request(header, (size_t)n, daemon->namebuff, &type)) |
{ |
{ |
char types[20]; | #ifdef HAVE_AUTH |
| struct auth_zone *zone; |
querystr(auth_dns ? "auth" : "query", types, type); | #endif |
| char *types = querystr(auth_dns ? "auth" : "query", type); |
| |
if (listen->family == AF_INET) |
if (listen->family == AF_INET) |
log_query(F_QUERY | F_IPV4 | F_FORWARD, daemon->namebuff, |
log_query(F_QUERY | F_IPV4 | F_FORWARD, daemon->namebuff, |
(struct all_addr *)&source_addr.in.sin_addr, types); |
(struct all_addr *)&source_addr.in.sin_addr, types); |
Line 836 void receive_query(struct listener *listen, time_t now
|
Line 1371 void receive_query(struct listener *listen, time_t now
|
log_query(F_QUERY | F_IPV6 | F_FORWARD, daemon->namebuff, |
log_query(F_QUERY | F_IPV6 | F_FORWARD, daemon->namebuff, |
(struct all_addr *)&source_addr.in6.sin6_addr, types); |
(struct all_addr *)&source_addr.in6.sin6_addr, types); |
#endif |
#endif |
|
|
|
#ifdef HAVE_AUTH |
|
/* find queries for zones we're authoritative for, and answer them directly */ |
|
if (!auth_dns && !option_bool(OPT_LOCALISE)) |
|
for (zone = daemon->auth_zones; zone; zone = zone->next) |
|
if (in_zone(zone, daemon->namebuff, NULL)) |
|
{ |
|
auth_dns = 1; |
|
local_auth = 1; |
|
break; |
|
} |
|
#endif |
|
|
|
#ifdef HAVE_LOOP |
|
/* Check for forwarding loop */ |
|
if (detect_loop(daemon->namebuff, type)) |
|
return; |
|
#endif |
} |
} |
|
|
|
if (find_pseudoheader(header, (size_t)n, NULL, &pheader, NULL, NULL)) |
|
{ |
|
unsigned short flags; |
|
|
|
have_pseudoheader = 1; |
|
GETSHORT(udp_size, pheader); |
|
pheader += 2; /* ext_rcode */ |
|
GETSHORT(flags, pheader); |
|
|
|
if (flags & 0x8000) |
|
do_bit = 1;/* do bit */ |
|
|
|
/* If the client provides an EDNS0 UDP size, use that to limit our reply. |
|
(bounded by the maximum configured). If no EDNS0, then it |
|
defaults to 512 */ |
|
if (udp_size > daemon->edns_pktsz) |
|
udp_size = daemon->edns_pktsz; |
|
} |
|
|
#ifdef HAVE_AUTH |
#ifdef HAVE_AUTH |
if (auth_dns) |
if (auth_dns) |
{ |
{ |
m = answer_auth(header, ((char *) header) + PACKETSZ, (size_t)n, now, &source_addr); | m = answer_auth(header, ((char *) header) + udp_size, (size_t)n, now, &source_addr, |
| local_auth, do_bit, have_pseudoheader); |
if (m >= 1) |
if (m >= 1) |
send_from(listen->fd, option_bool(OPT_NOWILD) || option_bool(OPT_CLEVERBIND), | { |
(char *)header, m, &source_addr, &dst_addr, if_index); | send_from(listen->fd, option_bool(OPT_NOWILD) || option_bool(OPT_CLEVERBIND), |
| (char *)header, m, &source_addr, &dst_addr, if_index); |
| daemon->auth_answer++; |
| } |
} |
} |
else |
else |
#endif |
#endif |
{ |
{ |
m = answer_request(header, ((char *) header) + PACKETSZ, (size_t)n, | int ad_reqd = do_bit; |
dst_addr_4, netmask, now); | /* RFC 6840 5.7 */ |
| if (header->hb4 & HB4_AD) |
| ad_reqd = 1; |
| |
| m = answer_request(header, ((char *) header) + udp_size, (size_t)n, |
| dst_addr_4, netmask, now, ad_reqd, do_bit, have_pseudoheader); |
|
|
if (m >= 1) |
if (m >= 1) |
{ |
{ |
Line 859 void receive_query(struct listener *listen, time_t now
|
Line 1440 void receive_query(struct listener *listen, time_t now
|
daemon->local_answer++; |
daemon->local_answer++; |
} |
} |
else if (forward_query(listen->fd, &source_addr, &dst_addr, if_index, |
else if (forward_query(listen->fd, &source_addr, &dst_addr, if_index, |
header, (size_t)n, now, NULL)) | header, (size_t)n, now, NULL, ad_reqd, do_bit)) |
daemon->queries_forwarded++; |
daemon->queries_forwarded++; |
else |
else |
daemon->local_answer++; |
daemon->local_answer++; |
} |
} |
} |
} |
|
|
|
#ifdef HAVE_DNSSEC |
|
/* Recurse up the key heirarchy */ |
|
static int tcp_key_recurse(time_t now, int status, struct dns_header *header, size_t n, |
|
int class, char *name, char *keyname, struct server *server, |
|
int have_mark, unsigned int mark, int *keycount) |
|
{ |
|
int new_status; |
|
unsigned char *packet = NULL; |
|
unsigned char *payload = NULL; |
|
struct dns_header *new_header = NULL; |
|
u16 *length = NULL; |
|
|
|
while (1) |
|
{ |
|
int type = SERV_DO_DNSSEC; |
|
char *domain; |
|
size_t m; |
|
unsigned char c1, c2; |
|
|
|
/* limit the amount of work we do, to avoid cycling forever on loops in the DNS */ |
|
if (--(*keycount) == 0) |
|
new_status = STAT_ABANDONED; |
|
else if (status == STAT_NEED_KEY) |
|
new_status = dnssec_validate_by_ds(now, header, n, name, keyname, class); |
|
else if (status == STAT_NEED_DS) |
|
new_status = dnssec_validate_ds(now, header, n, name, keyname, class); |
|
else |
|
new_status = dnssec_validate_reply(now, header, n, name, keyname, &class, option_bool(OPT_DNSSEC_NO_SIGN), NULL, NULL); |
|
|
|
if (new_status != STAT_NEED_DS && new_status != STAT_NEED_KEY) |
|
break; |
|
|
|
/* Can't validate because we need a key/DS whose name now in keyname. |
|
Make query for same, and recurse to validate */ |
|
if (!packet) |
|
{ |
|
packet = whine_malloc(65536 + MAXDNAME + RRFIXEDSZ + sizeof(u16)); |
|
payload = &packet[2]; |
|
new_header = (struct dns_header *)payload; |
|
length = (u16 *)packet; |
|
} |
|
|
|
if (!packet) |
|
{ |
|
new_status = STAT_ABANDONED; |
|
break; |
|
} |
|
|
|
m = dnssec_generate_query(new_header, ((unsigned char *) new_header) + 65536, keyname, class, |
|
new_status == STAT_NEED_KEY ? T_DNSKEY : T_DS, &server->addr, server->edns_pktsz); |
|
|
|
*length = htons(m); |
|
|
|
/* Find server to forward to. This will normally be the |
|
same as for the original query, but may be another if |
|
servers for domains are involved. */ |
|
if (search_servers(now, NULL, F_QUERY, keyname, &type, &domain, NULL) == 0) |
|
{ |
|
struct server *start = server, *new_server = NULL; |
|
type &= ~SERV_DO_DNSSEC; |
|
|
|
while (1) |
|
{ |
|
if (type == (start->flags & SERV_TYPE) && |
|
(type != SERV_HAS_DOMAIN || hostname_isequal(domain, start->domain)) && |
|
!(start->flags & (SERV_LITERAL_ADDRESS | SERV_LOOP))) |
|
{ |
|
new_server = start; |
|
if (server == start) |
|
{ |
|
new_server = NULL; |
|
break; |
|
} |
|
} |
|
|
|
if (!(start = start->next)) |
|
start = daemon->servers; |
|
if (start == server) |
|
break; |
|
} |
|
|
|
|
|
if (new_server) |
|
{ |
|
server = new_server; |
|
/* may need to make new connection. */ |
|
if (server->tcpfd == -1) |
|
{ |
|
if ((server->tcpfd = socket(server->addr.sa.sa_family, SOCK_STREAM, 0)) == -1) |
|
{ |
|
new_status = STAT_ABANDONED; |
|
break; |
|
} |
|
|
|
#ifdef HAVE_CONNTRACK |
|
/* Copy connection mark of incoming query to outgoing connection. */ |
|
if (have_mark) |
|
setsockopt(server->tcpfd, SOL_SOCKET, SO_MARK, &mark, sizeof(unsigned int)); |
|
#endif |
|
|
|
if (!local_bind(server->tcpfd, &server->source_addr, server->interface, 1) || |
|
connect(server->tcpfd, &server->addr.sa, sa_len(&server->addr)) == -1) |
|
{ |
|
close(server->tcpfd); |
|
server->tcpfd = -1; |
|
new_status = STAT_ABANDONED; |
|
break; |
|
} |
|
|
|
} |
|
} |
|
} |
|
|
|
|
|
if (!read_write(server->tcpfd, packet, m + sizeof(u16), 0) || |
|
!read_write(server->tcpfd, &c1, 1, 1) || |
|
!read_write(server->tcpfd, &c2, 1, 1) || |
|
!read_write(server->tcpfd, payload, (c1 << 8) | c2, 1)) |
|
{ |
|
new_status = STAT_ABANDONED; |
|
break; |
|
} |
|
|
|
m = (c1 << 8) | c2; |
|
|
|
new_status = tcp_key_recurse(now, new_status, new_header, m, class, name, keyname, server, have_mark, mark, keycount); |
|
|
|
if (new_status != STAT_OK) |
|
break; |
|
} |
|
|
|
if (packet) |
|
free(packet); |
|
|
|
return new_status; |
|
} |
|
#endif |
|
|
|
|
/* The daemon forks before calling this: it should deal with one connection, |
/* The daemon forks before calling this: it should deal with one connection, |
blocking as neccessary, and then return. Note, need to be a bit careful |
blocking as neccessary, and then return. Note, need to be a bit careful |
about resources for debug mode, when the fork is suppressed: that's |
about resources for debug mode, when the fork is suppressed: that's |
Line 875 unsigned char *tcp_request(int confd, time_t now,
|
Line 1595 unsigned char *tcp_request(int confd, time_t now,
|
{ |
{ |
size_t size = 0; |
size_t size = 0; |
int norebind = 0; |
int norebind = 0; |
int checking_disabled; | #ifdef HAVE_AUTH |
| int local_auth = 0; |
| #endif |
| int checking_disabled, do_bit, added_pheader = 0, have_pseudoheader = 0; |
| int check_subnet, no_cache_dnssec = 0, cache_secure = 0, bogusanswer = 0; |
size_t m; |
size_t m; |
unsigned short qtype; |
unsigned short qtype; |
unsigned int gotname; |
unsigned int gotname; |
unsigned char c1, c2; |
unsigned char c1, c2; |
/* Max TCP packet + slop */ | /* Max TCP packet + slop + size */ |
unsigned char *packet = whine_malloc(65536 + MAXDNAME + RRFIXEDSZ); | unsigned char *packet = whine_malloc(65536 + MAXDNAME + RRFIXEDSZ + sizeof(u16)); |
struct dns_header *header; | unsigned char *payload = &packet[2]; |
| /* largest field in header is 16-bits, so this is still sufficiently aligned */ |
| struct dns_header *header = (struct dns_header *)payload; |
| u16 *length = (u16 *)packet; |
struct server *last_server; |
struct server *last_server; |
struct in_addr dst_addr_4; |
struct in_addr dst_addr_4; |
union mysockaddr peer_addr; |
union mysockaddr peer_addr; |
socklen_t peer_len = sizeof(union mysockaddr); |
socklen_t peer_len = sizeof(union mysockaddr); |
| int query_count = 0; |
| unsigned char *pheader; |
| unsigned int mark = 0; |
| int have_mark = 0; |
| |
| (void)mark; |
| (void)have_mark; |
| |
if (getpeername(confd, (struct sockaddr *)&peer_addr, &peer_len) == -1) |
if (getpeername(confd, (struct sockaddr *)&peer_addr, &peer_len) == -1) |
return packet; |
return packet; |
|
|
|
#ifdef HAVE_CONNTRACK |
|
/* Get connection mark of incoming query to set on outgoing connections. */ |
|
if (option_bool(OPT_CONNTRACK)) |
|
{ |
|
struct all_addr local; |
|
#ifdef HAVE_IPV6 |
|
if (local_addr->sa.sa_family == AF_INET6) |
|
local.addr.addr6 = local_addr->in6.sin6_addr; |
|
else |
|
#endif |
|
local.addr.addr4 = local_addr->in.sin_addr; |
|
|
|
have_mark = get_incoming_mark(&peer_addr, &local, 1, &mark); |
|
} |
|
#endif |
|
|
|
/* We can be configured to only accept queries from at-most-one-hop-away addresses. */ |
|
if (option_bool(OPT_LOCAL_SERVICE)) |
|
{ |
|
struct addrlist *addr; |
|
#ifdef HAVE_IPV6 |
|
if (peer_addr.sa.sa_family == AF_INET6) |
|
{ |
|
for (addr = daemon->interface_addrs; addr; addr = addr->next) |
|
if ((addr->flags & ADDRLIST_IPV6) && |
|
is_same_net6(&addr->addr.addr.addr6, &peer_addr.in6.sin6_addr, addr->prefixlen)) |
|
break; |
|
} |
|
else |
|
#endif |
|
{ |
|
struct in_addr netmask; |
|
for (addr = daemon->interface_addrs; addr; addr = addr->next) |
|
{ |
|
netmask.s_addr = htonl(~(in_addr_t)0 << (32 - addr->prefixlen)); |
|
if (!(addr->flags & ADDRLIST_IPV6) && |
|
is_same_net(addr->addr.addr.addr4, peer_addr.in.sin_addr, netmask)) |
|
break; |
|
} |
|
} |
|
if (!addr) |
|
{ |
|
my_syslog(LOG_WARNING, _("Ignoring query from non-local network")); |
|
return packet; |
|
} |
|
} |
|
|
while (1) |
while (1) |
{ |
{ |
if (!packet || | if (query_count == TCP_MAX_QUERIES || |
| !packet || |
!read_write(confd, &c1, 1, 1) || !read_write(confd, &c2, 1, 1) || |
!read_write(confd, &c1, 1, 1) || !read_write(confd, &c2, 1, 1) || |
!(size = c1 << 8 | c2) || |
!(size = c1 << 8 | c2) || |
!read_write(confd, packet, size, 1)) | !read_write(confd, payload, size, 1)) |
return packet; |
return packet; |
|
|
if (size < (int)sizeof(struct dns_header)) |
if (size < (int)sizeof(struct dns_header)) |
continue; |
continue; |
|
|
header = (struct dns_header *)packet; | query_count++; |
|
|
|
/* log_query gets called indirectly all over the place, so |
|
pass these in global variables - sorry. */ |
|
daemon->log_display_id = ++daemon->log_id; |
|
daemon->log_source_addr = &peer_addr; |
|
|
/* save state of "cd" flag in query */ |
/* save state of "cd" flag in query */ |
checking_disabled = header->hb4 & HB4_CD; | if ((checking_disabled = header->hb4 & HB4_CD)) |
| no_cache_dnssec = 1; |
|
|
/* RFC 4035: sect 4.6 para 2 */ |
|
header->hb4 &= ~HB4_AD; |
|
|
|
if ((gotname = extract_request(header, (unsigned int)size, daemon->namebuff, &qtype))) |
if ((gotname = extract_request(header, (unsigned int)size, daemon->namebuff, &qtype))) |
{ |
{ |
char types[20]; | #ifdef HAVE_AUTH |
| struct auth_zone *zone; |
| #endif |
| char *types = querystr(auth_dns ? "auth" : "query", qtype); |
|
|
querystr(auth_dns ? "auth" : "query", types, qtype); |
|
|
|
if (peer_addr.sa.sa_family == AF_INET) |
if (peer_addr.sa.sa_family == AF_INET) |
log_query(F_QUERY | F_IPV4 | F_FORWARD, daemon->namebuff, |
log_query(F_QUERY | F_IPV4 | F_FORWARD, daemon->namebuff, |
(struct all_addr *)&peer_addr.in.sin_addr, types); |
(struct all_addr *)&peer_addr.in.sin_addr, types); |
Line 924 unsigned char *tcp_request(int confd, time_t now,
|
Line 1710 unsigned char *tcp_request(int confd, time_t now,
|
log_query(F_QUERY | F_IPV6 | F_FORWARD, daemon->namebuff, |
log_query(F_QUERY | F_IPV6 | F_FORWARD, daemon->namebuff, |
(struct all_addr *)&peer_addr.in6.sin6_addr, types); |
(struct all_addr *)&peer_addr.in6.sin6_addr, types); |
#endif |
#endif |
|
|
|
#ifdef HAVE_AUTH |
|
/* find queries for zones we're authoritative for, and answer them directly */ |
|
if (!auth_dns && !option_bool(OPT_LOCALISE)) |
|
for (zone = daemon->auth_zones; zone; zone = zone->next) |
|
if (in_zone(zone, daemon->namebuff, NULL)) |
|
{ |
|
auth_dns = 1; |
|
local_auth = 1; |
|
break; |
|
} |
|
#endif |
} |
} |
|
|
if (local_addr->sa.sa_family == AF_INET) |
if (local_addr->sa.sa_family == AF_INET) |
Line 931 unsigned char *tcp_request(int confd, time_t now,
|
Line 1729 unsigned char *tcp_request(int confd, time_t now,
|
else |
else |
dst_addr_4.s_addr = 0; |
dst_addr_4.s_addr = 0; |
|
|
|
do_bit = 0; |
|
|
|
if (find_pseudoheader(header, (size_t)size, NULL, &pheader, NULL, NULL)) |
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{ |
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unsigned short flags; |
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have_pseudoheader = 1; |
|
pheader += 4; /* udp_size, ext_rcode */ |
|
GETSHORT(flags, pheader); |
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|
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if (flags & 0x8000) |
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do_bit = 1; /* do bit */ |
|
} |
|
|
#ifdef HAVE_AUTH |
#ifdef HAVE_AUTH |
if (auth_dns) |
if (auth_dns) |
m = answer_auth(header, ((char *) header) + 65536, (size_t)size, now, &peer_addr); | m = answer_auth(header, ((char *) header) + 65536, (size_t)size, now, &peer_addr, |
| local_auth, do_bit, have_pseudoheader); |
else |
else |
#endif |
#endif |
{ |
{ |
/* m > 0 if answered from cache */ | int ad_reqd = do_bit; |
m = answer_request(header, ((char *) header) + 65536, (size_t)size, | /* RFC 6840 5.7 */ |
dst_addr_4, netmask, now); | if (header->hb4 & HB4_AD) |
| ad_reqd = 1; |
| |
| /* m > 0 if answered from cache */ |
| m = answer_request(header, ((char *) header) + 65536, (size_t)size, |
| dst_addr_4, netmask, now, ad_reqd, do_bit, have_pseudoheader); |
|
|
/* Do this by steam now we're not in the select() loop */ |
/* Do this by steam now we're not in the select() loop */ |
check_log_writer(NULL); | check_log_writer(1); |
|
|
if (m == 0) |
if (m == 0) |
{ |
{ |
unsigned int flags = 0; |
unsigned int flags = 0; |
struct all_addr *addrp = NULL; |
struct all_addr *addrp = NULL; |
int type = 0; | int type = SERV_DO_DNSSEC; |
char *domain = NULL; |
char *domain = NULL; |
|
size_t new_size = add_edns0_config(header, size, ((unsigned char *) header) + 65536, &peer_addr, now, &check_subnet); |
|
|
|
if (size != new_size) |
|
{ |
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added_pheader = 1; |
|
size = new_size; |
|
} |
|
|
if (option_bool(OPT_ADD_MAC)) |
|
size = add_mac(header, size, ((char *) header) + 65536, &peer_addr); |
|
|
|
if (gotname) |
if (gotname) |
flags = search_servers(now, &addrp, gotname, daemon->namebuff, &type, &domain, &norebind); |
flags = search_servers(now, &addrp, gotname, daemon->namebuff, &type, &domain, &norebind); |
|
|
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type &= ~SERV_DO_DNSSEC; |
|
|
if (type != 0 || option_bool(OPT_ORDER) || !daemon->last_server) |
if (type != 0 || option_bool(OPT_ORDER) || !daemon->last_server) |
last_server = daemon->servers; |
last_server = daemon->servers; |
else |
else |
Line 965 unsigned char *tcp_request(int confd, time_t now,
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Line 1789 unsigned char *tcp_request(int confd, time_t now,
|
if (!flags && last_server) |
if (!flags && last_server) |
{ |
{ |
struct server *firstsendto = NULL; |
struct server *firstsendto = NULL; |
|
#ifdef HAVE_DNSSEC |
|
unsigned char *newhash, hash[HASH_SIZE]; |
|
if ((newhash = hash_questions(header, (unsigned int)size, daemon->namebuff))) |
|
memcpy(hash, newhash, HASH_SIZE); |
|
else |
|
memset(hash, 0, HASH_SIZE); |
|
#else |
unsigned int crc = questions_crc(header, (unsigned int)size, daemon->namebuff); |
unsigned int crc = questions_crc(header, (unsigned int)size, daemon->namebuff); |
| #endif |
/* Loop round available servers until we succeed in connecting to one. |
/* Loop round available servers until we succeed in connecting to one. |
Note that this code subtley ensures that consecutive queries on this connection |
Note that this code subtley ensures that consecutive queries on this connection |
which can go to the same server, do so. */ |
which can go to the same server, do so. */ |
Line 985 unsigned char *tcp_request(int confd, time_t now,
|
Line 1816 unsigned char *tcp_request(int confd, time_t now,
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|
|
/* server for wrong domain */ |
/* server for wrong domain */ |
if (type != (last_server->flags & SERV_TYPE) || |
if (type != (last_server->flags & SERV_TYPE) || |
(type == SERV_HAS_DOMAIN && !hostname_isequal(domain, last_server->domain))) | (type == SERV_HAS_DOMAIN && !hostname_isequal(domain, last_server->domain)) || |
| (last_server->flags & (SERV_LITERAL_ADDRESS | SERV_LOOP))) |
continue; |
continue; |
|
|
if (last_server->tcpfd == -1) |
if (last_server->tcpfd == -1) |
Line 993 unsigned char *tcp_request(int confd, time_t now,
|
Line 1825 unsigned char *tcp_request(int confd, time_t now,
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if ((last_server->tcpfd = socket(last_server->addr.sa.sa_family, SOCK_STREAM, 0)) == -1) |
if ((last_server->tcpfd = socket(last_server->addr.sa.sa_family, SOCK_STREAM, 0)) == -1) |
continue; |
continue; |
|
|
|
#ifdef HAVE_CONNTRACK |
|
/* Copy connection mark of incoming query to outgoing connection. */ |
|
if (have_mark) |
|
setsockopt(last_server->tcpfd, SOL_SOCKET, SO_MARK, &mark, sizeof(unsigned int)); |
|
#endif |
|
|
if ((!local_bind(last_server->tcpfd, &last_server->source_addr, last_server->interface, 1) || |
if ((!local_bind(last_server->tcpfd, &last_server->source_addr, last_server->interface, 1) || |
connect(last_server->tcpfd, &last_server->addr.sa, sa_len(&last_server->addr)) == -1)) |
connect(last_server->tcpfd, &last_server->addr.sa, sa_len(&last_server->addr)) == -1)) |
{ |
{ |
Line 1001 unsigned char *tcp_request(int confd, time_t now,
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Line 1839 unsigned char *tcp_request(int confd, time_t now,
|
continue; |
continue; |
} |
} |
|
|
#ifdef HAVE_CONNTRACK | #ifdef HAVE_DNSSEC |
/* Copy connection mark of incoming query to outgoing connection. */ | if (option_bool(OPT_DNSSEC_VALID) && (last_server->flags & SERV_DO_DNSSEC)) |
if (option_bool(OPT_CONNTRACK)) | |
{ |
{ |
unsigned int mark; | new_size = add_do_bit(header, size, ((unsigned char *) header) + 65536); |
struct all_addr local; | |
#ifdef HAVE_IPV6 | |
if (local_addr->sa.sa_family == AF_INET6) | |
local.addr.addr6 = local_addr->in6.sin6_addr; | |
else | |
#endif | |
local.addr.addr4 = local_addr->in.sin_addr; | |
|
|
if (get_incoming_mark(&peer_addr, &local, 1, &mark)) | if (size != new_size) |
setsockopt(last_server->tcpfd, SOL_SOCKET, SO_MARK, &mark, sizeof(unsigned int)); | { |
| added_pheader = 1; |
| size = new_size; |
| } |
| |
| /* For debugging, set Checking Disabled, otherwise, have the upstream check too, |
| this allows it to select auth servers when one is returning bad data. */ |
| if (option_bool(OPT_DNSSEC_DEBUG)) |
| header->hb4 |= HB4_CD; |
} |
} |
#endif | #endif |
} |
} |
|
|
c1 = size >> 8; | *length = htons(size); |
c2 = size; | |
| /* get query name again for logging - may have been overwritten */ |
| if (!(gotname = extract_request(header, (unsigned int)size, daemon->namebuff, &qtype))) |
| strcpy(daemon->namebuff, "query"); |
|
|
if (!read_write(last_server->tcpfd, &c1, 1, 0) || | if (!read_write(last_server->tcpfd, packet, size + sizeof(u16), 0) || |
!read_write(last_server->tcpfd, &c2, 1, 0) || | |
!read_write(last_server->tcpfd, packet, size, 0) || | |
!read_write(last_server->tcpfd, &c1, 1, 1) || |
!read_write(last_server->tcpfd, &c1, 1, 1) || |
!read_write(last_server->tcpfd, &c2, 1, 1)) | !read_write(last_server->tcpfd, &c2, 1, 1) || |
| !read_write(last_server->tcpfd, payload, (c1 << 8) | c2, 1)) |
{ |
{ |
close(last_server->tcpfd); |
close(last_server->tcpfd); |
last_server->tcpfd = -1; |
last_server->tcpfd = -1; |
Line 1035 unsigned char *tcp_request(int confd, time_t now,
|
Line 1875 unsigned char *tcp_request(int confd, time_t now,
|
} |
} |
|
|
m = (c1 << 8) | c2; |
m = (c1 << 8) | c2; |
if (!read_write(last_server->tcpfd, packet, m, 1)) |
|
return packet; |
|
|
|
if (!gotname) |
|
strcpy(daemon->namebuff, "query"); |
|
if (last_server->addr.sa.sa_family == AF_INET) |
if (last_server->addr.sa.sa_family == AF_INET) |
log_query(F_SERVER | F_IPV4 | F_FORWARD, daemon->namebuff, |
log_query(F_SERVER | F_IPV4 | F_FORWARD, daemon->namebuff, |
(struct all_addr *)&last_server->addr.in.sin_addr, NULL); |
(struct all_addr *)&last_server->addr.in.sin_addr, NULL); |
Line 1048 unsigned char *tcp_request(int confd, time_t now,
|
Line 1884 unsigned char *tcp_request(int confd, time_t now,
|
log_query(F_SERVER | F_IPV6 | F_FORWARD, daemon->namebuff, |
log_query(F_SERVER | F_IPV6 | F_FORWARD, daemon->namebuff, |
(struct all_addr *)&last_server->addr.in6.sin6_addr, NULL); |
(struct all_addr *)&last_server->addr.in6.sin6_addr, NULL); |
#endif |
#endif |
|
|
|
#ifdef HAVE_DNSSEC |
|
if (option_bool(OPT_DNSSEC_VALID) && !checking_disabled && (last_server->flags & SERV_DO_DNSSEC)) |
|
{ |
|
int keycount = DNSSEC_WORK; /* Limit to number of DNSSEC questions, to catch loops and avoid filling cache. */ |
|
int status = tcp_key_recurse(now, STAT_OK, header, m, 0, daemon->namebuff, daemon->keyname, |
|
last_server, have_mark, mark, &keycount); |
|
char *result, *domain = "result"; |
|
|
|
if (status == STAT_ABANDONED) |
|
{ |
|
result = "ABANDONED"; |
|
status = STAT_BOGUS; |
|
} |
|
else |
|
result = (status == STAT_SECURE ? "SECURE" : (status == STAT_INSECURE ? "INSECURE" : "BOGUS")); |
|
|
|
if (status == STAT_BOGUS && extract_request(header, m, daemon->namebuff, NULL)) |
|
domain = daemon->namebuff; |
|
|
|
log_query(F_KEYTAG | F_SECSTAT, domain, NULL, result); |
|
|
|
if (status == STAT_BOGUS) |
|
{ |
|
no_cache_dnssec = 1; |
|
bogusanswer = 1; |
|
} |
|
|
|
if (status == STAT_SECURE) |
|
cache_secure = 1; |
|
} |
|
#endif |
|
|
|
/* restore CD bit to the value in the query */ |
|
if (checking_disabled) |
|
header->hb4 |= HB4_CD; |
|
else |
|
header->hb4 &= ~HB4_CD; |
|
|
/* There's no point in updating the cache, since this process will exit and |
/* There's no point in updating the cache, since this process will exit and |
lose the information after a few queries. We make this call for the alias and |
lose the information after a few queries. We make this call for the alias and |
Line 1055 unsigned char *tcp_request(int confd, time_t now,
|
Line 1929 unsigned char *tcp_request(int confd, time_t now,
|
/* If the crc of the question section doesn't match the crc we sent, then |
/* If the crc of the question section doesn't match the crc we sent, then |
someone might be attempting to insert bogus values into the cache by |
someone might be attempting to insert bogus values into the cache by |
sending replies containing questions and bogus answers. */ |
sending replies containing questions and bogus answers. */ |
if (crc == questions_crc(header, (unsigned int)m, daemon->namebuff)) | #ifdef HAVE_DNSSEC |
m = process_reply(header, now, last_server, (unsigned int)m, | newhash = hash_questions(header, (unsigned int)m, daemon->namebuff); |
option_bool(OPT_NO_REBIND) && !norebind, checking_disabled); | if (!newhash || memcmp(hash, newhash, HASH_SIZE) != 0) |
| { |
| m = 0; |
| break; |
| } |
| #else |
| if (crc != questions_crc(header, (unsigned int)m, daemon->namebuff)) |
| { |
| m = 0; |
| break; |
| } |
| #endif |
| |
| m = process_reply(header, now, last_server, (unsigned int)m, |
| option_bool(OPT_NO_REBIND) && !norebind, no_cache_dnssec, cache_secure, bogusanswer, |
| ad_reqd, do_bit, added_pheader, check_subnet, &peer_addr); |
|
|
break; |
break; |
} |
} |
Line 1069 unsigned char *tcp_request(int confd, time_t now,
|
Line 1958 unsigned char *tcp_request(int confd, time_t now,
|
} |
} |
} |
} |
|
|
check_log_writer(NULL); | check_log_writer(1); |
|
|
c1 = m>>8; | *length = htons(m); |
c2 = m; | |
if (m == 0 || | if (m == 0 || !read_write(confd, packet, m + sizeof(u16), 0)) |
!read_write(confd, &c1, 1, 0) || | |
!read_write(confd, &c2, 1, 0) || | |
!read_write(confd, packet, m, 0)) | |
return packet; |
return packet; |
} |
} |
} |
} |
Line 1095 static struct frec *allocate_frec(time_t now)
|
Line 1981 static struct frec *allocate_frec(time_t now)
|
#ifdef HAVE_IPV6 |
#ifdef HAVE_IPV6 |
f->rfd6 = NULL; |
f->rfd6 = NULL; |
#endif |
#endif |
|
#ifdef HAVE_DNSSEC |
|
f->dependent = NULL; |
|
f->blocking_query = NULL; |
|
f->stash = NULL; |
|
#endif |
daemon->frec_list = f; |
daemon->frec_list = f; |
} |
} |
|
|
return f; |
return f; |
} |
} |
|
|
static struct randfd *allocate_rfd(int family) | struct randfd *allocate_rfd(int family) |
{ |
{ |
static int finger = 0; |
static int finger = 0; |
int i; |
int i; |
Line 1137 static struct randfd *allocate_rfd(int family)
|
Line 2028 static struct randfd *allocate_rfd(int family)
|
return NULL; /* doom */ |
return NULL; /* doom */ |
} |
} |
|
|
|
void free_rfd(struct randfd *rfd) |
|
{ |
|
if (rfd && --(rfd->refcount) == 0) |
|
close(rfd->fd); |
|
} |
|
|
static void free_frec(struct frec *f) |
static void free_frec(struct frec *f) |
{ |
{ |
if (f->rfd4 && --(f->rfd4->refcount) == 0) | free_rfd(f->rfd4); |
close(f->rfd4->fd); | |
| |
f->rfd4 = NULL; |
f->rfd4 = NULL; |
f->sentto = NULL; |
f->sentto = NULL; |
f->flags = 0; |
f->flags = 0; |
|
|
#ifdef HAVE_IPV6 |
#ifdef HAVE_IPV6 |
if (f->rfd6 && --(f->rfd6->refcount) == 0) | free_rfd(f->rfd6); |
close(f->rfd6->fd); | |
| |
f->rfd6 = NULL; |
f->rfd6 = NULL; |
#endif |
#endif |
|
|
|
#ifdef HAVE_DNSSEC |
|
if (f->stash) |
|
{ |
|
blockdata_free(f->stash); |
|
f->stash = NULL; |
|
} |
|
|
|
/* Anything we're waiting on is pointless now, too */ |
|
if (f->blocking_query) |
|
free_frec(f->blocking_query); |
|
f->blocking_query = NULL; |
|
f->dependent = NULL; |
|
#endif |
} |
} |
|
|
/* if wait==NULL return a free or older than TIMEOUT record. |
/* if wait==NULL return a free or older than TIMEOUT record. |
else return *wait zero if one available, or *wait is delay to |
else return *wait zero if one available, or *wait is delay to |
when the oldest in-use record will expire. Impose an absolute |
when the oldest in-use record will expire. Impose an absolute |
limit of 4*TIMEOUT before we wipe things (for random sockets) */ | limit of 4*TIMEOUT before we wipe things (for random sockets). |
struct frec *get_new_frec(time_t now, int *wait) | If force is set, always return a result, even if we have |
| to allocate above the limit. */ |
| struct frec *get_new_frec(time_t now, int *wait, int force) |
{ |
{ |
struct frec *f, *oldest, *target; |
struct frec *f, *oldest, *target; |
int count; |
int count; |
Line 1171 struct frec *get_new_frec(time_t now, int *wait)
|
Line 2080 struct frec *get_new_frec(time_t now, int *wait)
|
target = f; |
target = f; |
else |
else |
{ |
{ |
if (difftime(now, f->time) >= 4*TIMEOUT) | #ifdef HAVE_DNSSEC |
{ | /* Don't free DNSSEC sub-queries here, as we may end up with |
free_frec(f); | dangling references to them. They'll go when their "real" query |
target = f; | is freed. */ |
} | if (!f->dependent) |
| #endif |
if (!oldest || difftime(f->time, oldest->time) <= 0) | { |
oldest = f; | if (difftime(now, f->time) >= 4*TIMEOUT) |
| { |
| free_frec(f); |
| target = f; |
| } |
| |
| |
| if (!oldest || difftime(f->time, oldest->time) <= 0) |
| oldest = f; |
| } |
} |
} |
|
|
if (target) |
if (target) |
Line 1207 struct frec *get_new_frec(time_t now, int *wait)
|
Line 2125 struct frec *get_new_frec(time_t now, int *wait)
|
} |
} |
|
|
/* none available, calculate time 'till oldest record expires */ |
/* none available, calculate time 'till oldest record expires */ |
if (count > daemon->ftabsize) | if (!force && count > daemon->ftabsize) |
{ |
{ |
|
static time_t last_log = 0; |
|
|
if (oldest && wait) |
if (oldest && wait) |
*wait = oldest->time + (time_t)TIMEOUT - now; |
*wait = oldest->time + (time_t)TIMEOUT - now; |
|
|
|
if ((int)difftime(now, last_log) > 5) |
|
{ |
|
last_log = now; |
|
my_syslog(LOG_WARNING, _("Maximum number of concurrent DNS queries reached (max: %d)"), daemon->ftabsize); |
|
} |
|
|
return NULL; |
return NULL; |
} |
} |
|
|
Line 1222 struct frec *get_new_frec(time_t now, int *wait)
|
Line 2149 struct frec *get_new_frec(time_t now, int *wait)
|
} |
} |
|
|
/* crc is all-ones if not known. */ |
/* crc is all-ones if not known. */ |
static struct frec *lookup_frec(unsigned short id, unsigned int crc) | static struct frec *lookup_frec(unsigned short id, void *hash) |
{ |
{ |
struct frec *f; |
struct frec *f; |
|
|
for(f = daemon->frec_list; f; f = f->next) |
for(f = daemon->frec_list; f; f = f->next) |
if (f->sentto && f->new_id == id && |
if (f->sentto && f->new_id == id && |
(f->crc == crc || crc == 0xffffffff)) | (!hash || memcmp(hash, f->hash, HASH_SIZE) == 0)) |
return f; |
return f; |
|
|
return NULL; |
return NULL; |
Line 1236 static struct frec *lookup_frec(unsigned short id, uns
|
Line 2163 static struct frec *lookup_frec(unsigned short id, uns
|
|
|
static struct frec *lookup_frec_by_sender(unsigned short id, |
static struct frec *lookup_frec_by_sender(unsigned short id, |
union mysockaddr *addr, |
union mysockaddr *addr, |
unsigned int crc) | void *hash) |
{ |
{ |
struct frec *f; |
struct frec *f; |
|
|
for(f = daemon->frec_list; f; f = f->next) |
for(f = daemon->frec_list; f; f = f->next) |
if (f->sentto && |
if (f->sentto && |
f->orig_id == id && |
f->orig_id == id && |
f->crc == crc && | memcmp(hash, f->hash, HASH_SIZE) == 0 && |
sockaddr_isequal(&f->source, addr)) |
sockaddr_isequal(&f->source, addr)) |
return f; |
return f; |
|
|
return NULL; |
return NULL; |
} |
} |
|
|
|
/* Send query packet again, if we can. */ |
|
void resend_query() |
|
{ |
|
if (daemon->srv_save) |
|
{ |
|
int fd; |
|
|
|
if (daemon->srv_save->sfd) |
|
fd = daemon->srv_save->sfd->fd; |
|
else if (daemon->rfd_save && daemon->rfd_save->refcount != 0) |
|
fd = daemon->rfd_save->fd; |
|
else |
|
return; |
|
|
|
while(retry_send(sendto(fd, daemon->packet, daemon->packet_len, 0, |
|
&daemon->srv_save->addr.sa, |
|
sa_len(&daemon->srv_save->addr)))); |
|
} |
|
} |
|
|
/* A server record is going away, remove references to it */ |
/* A server record is going away, remove references to it */ |
void server_gone(struct server *server) |
void server_gone(struct server *server) |
Line 1267 void server_gone(struct server *server)
|
Line 2214 void server_gone(struct server *server)
|
} |
} |
|
|
/* return unique random ids. */ |
/* return unique random ids. */ |
static unsigned short get_id(unsigned int crc) | static unsigned short get_id(void) |
{ |
{ |
unsigned short ret = 0; |
unsigned short ret = 0; |
|
|
do |
do |
ret = rand16(); |
ret = rand16(); |
while (lookup_frec(ret, crc)); | while (lookup_frec(ret, NULL)); |
|
|
return ret; |
return ret; |
} |
} |