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Remove ability to compile without IPv6 support.

Browse Source 
This was the source of a large number of #ifdefs, originally
included for use with old embedded libc versions. I'm
sure no-one wants or needs IPv6-free code these days, so this
is a move towards more maintainable code.
This commit is contained in:
Simon Kelley
2018-10-23 22:10:17 +01:00
parent a220545c42
commit ee8750451b
22 changed files with 56 additions and 418 deletions
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68
src/forward.c
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@@ -38,9 +38,7 @@ int send_from(int fd, int nowild, char *packet, size_t len,
#elif defined(IP_SENDSRCADDR)
char control[CMSG_SPACE(sizeof(struct in_addr))];
#endif
#ifdef HAVE_IPV6
char control6[CMSG_SPACE(sizeof(struct in6_pktinfo))];
#endif
} control_u;
iov[0].iov_base = packet;
@@ -79,7 +77,6 @@ int send_from(int fd, int nowild, char *packet, size_t len,
#endif
}
else
#ifdef HAVE_IPV6
{
struct in6_pktinfo p;
p.ipi6_ifindex = iface; /* Need iface for IPv6 to handle link-local addrs */
@@ -89,9 +86,6 @@ int send_from(int fd, int nowild, char *packet, size_t len,
cmptr->cmsg_type = daemon->v6pktinfo;
cmptr->cmsg_level = IPPROTO_IPV6;
}
#else
(void)iface; /* eliminate warning */
#endif
}
while (retry_send(sendmsg(fd, &msg, 0)));
@@ -144,10 +138,8 @@ static unsigned int search_servers(time_t now, struct all_addr **addrpp, unsigne
flags = sflag;
if (serv->addr.sa.sa_family == AF_INET)
*addrpp = (struct all_addr *)&serv->addr.in.sin_addr;
#ifdef HAVE_IPV6
else
*addrpp = (struct all_addr *)&serv->addr.in6.sin6_addr;
#endif
}
else if (!flags || (flags & F_NXDOMAIN))
flags = F_NOERR;
@@ -204,10 +196,8 @@ static unsigned int search_servers(time_t now, struct all_addr **addrpp, unsigne
flags = sflag;
if (serv->addr.sa.sa_family == AF_INET)
*addrpp = (struct all_addr *)&serv->addr.in.sin_addr;
#ifdef HAVE_IPV6
else
*addrpp = (struct all_addr *)&serv->addr.in6.sin6_addr;
#endif
}
else if (!flags || (flags & F_NXDOMAIN))
flags = F_NOERR;
@@ -236,10 +226,8 @@ static unsigned int search_servers(time_t now, struct all_addr **addrpp, unsigne
/* handle F_IPV4 and F_IPV6 set on ANY query to 0.0.0.0/:: domain. */
if (flags & F_IPV4)
log_query((flags | F_CONFIG | F_FORWARD) & ~F_IPV6, qdomain, *addrpp, NULL);
#ifdef HAVE_IPV6
if (flags & F_IPV6)
log_query((flags | F_CONFIG | F_FORWARD) & ~F_IPV4, qdomain, *addrpp, NULL);
#endif
}
}
else if ((*type) & SERV_USE_RESOLV)
@@ -302,20 +290,17 @@ static int forward_query(int udpfd, union mysockaddr *udpaddr,
if (forward->sentto->addr.sa.sa_family == AF_INET)
log_query(F_NOEXTRA | F_DNSSEC | F_IPV4, "retry", (struct all_addr *)&forward->sentto->addr.in.sin_addr, "dnssec");
#ifdef HAVE_IPV6
else
log_query(F_NOEXTRA | F_DNSSEC | F_IPV6, "retry", (struct all_addr *)&forward->sentto->addr.in6.sin6_addr, "dnssec");
#endif
if (forward->sentto->sfd)
fd = forward->sentto->sfd->fd;
else
{
#ifdef HAVE_IPV6
if (forward->sentto->addr.sa.sa_family == AF_INET6)
fd = forward->rfd6->fd;
else
#endif
fd = forward->rfd4->fd;
}
@@ -475,7 +460,6 @@ static int forward_query(int udpfd, union mysockaddr *udpaddr,
fd = start->sfd->fd;
else
{
#ifdef HAVE_IPV6
if (start->addr.sa.sa_family == AF_INET6)
{
if (!forward->rfd6 &&
@@ -485,7 +469,6 @@ static int forward_query(int udpfd, union mysockaddr *udpaddr,
fd = forward->rfd6->fd;
}
else
#endif
{
if (!forward->rfd4 &&
!(forward->rfd4 = allocate_rfd(AF_INET)))
@@ -541,11 +524,9 @@ static int forward_query(int udpfd, union mysockaddr *udpaddr,
if (start->addr.sa.sa_family == AF_INET)
log_query(F_SERVER | F_IPV4 | F_FORWARD, daemon->namebuff,
(struct all_addr *)&start->addr.in.sin_addr, NULL);
#ifdef HAVE_IPV6
else
log_query(F_SERVER | F_IPV6 | F_FORWARD, daemon->namebuff,
(struct all_addr *)&start->addr.in6.sin6_addr, NULL);
#endif
start->queries++;
forwarded = 1;
forward->sentto = start;
@@ -788,11 +769,8 @@ void reply_query(int fd, int family, time_t now)
daemon->srv_save = NULL;
/* Determine the address of the server replying so that we can mark that as good */
serveraddr.sa.sa_family = family;
#ifdef HAVE_IPV6
if (serveraddr.sa.sa_family == AF_INET6)
if ((serveraddr.sa.sa_family = family) == AF_INET6)
serveraddr.in6.sin6_flowinfo = 0;
#endif
header = (struct dns_header *)daemon->packet;
@@ -878,7 +856,6 @@ void reply_query(int fd, int family, time_t now)
fd = start->sfd->fd;
else
{
#ifdef HAVE_IPV6
if (start->addr.sa.sa_family == AF_INET6)
{
/* may have changed family */
@@ -887,7 +864,6 @@ void reply_query(int fd, int family, time_t now)
fd = forward->rfd6->fd;
}
else
#endif
{
/* may have changed family */
if (!forward->rfd4)
@@ -902,10 +878,8 @@ void reply_query(int fd, int family, time_t now)
if (start->addr.sa.sa_family == AF_INET)
log_query(F_NOEXTRA | F_DNSSEC | F_IPV4, "retry", (struct all_addr *)&start->addr.in.sin_addr, "dnssec");
#ifdef HAVE_IPV6
else
log_query(F_NOEXTRA | F_DNSSEC | F_IPV6, "retry", (struct all_addr *)&start->addr.in6.sin6_addr, "dnssec");
#endif
return;
}
@@ -1099,9 +1073,7 @@ void reply_query(int fd, int family, time_t now)
new->sentto = server;
new->rfd4 = NULL;
#ifdef HAVE_IPV6
new->rfd6 = NULL;
#endif
new->flags &= ~(FREC_DNSKEY_QUERY | FREC_DS_QUERY | FREC_HAS_EXTRADATA);
new->forwardall = 0;
@@ -1125,11 +1097,9 @@ void reply_query(int fd, int family, time_t now)
if (server->addr.sa.sa_family == AF_INET)
log_query(F_NOEXTRA | F_DNSSEC | F_IPV4, daemon->keyname, (struct all_addr *)&(server->addr.in.sin_addr),
querystr("dnssec-query", querytype));
#ifdef HAVE_IPV6
else
log_query(F_NOEXTRA | F_DNSSEC | F_IPV6, daemon->keyname, (struct all_addr *)&(server->addr.in6.sin6_addr),
querystr("dnssec-query", querytype));
#endif
if ((hash = hash_questions(header, nn, daemon->namebuff)))
memcpy(new->hash, hash, HASH_SIZE);
@@ -1147,14 +1117,12 @@ void reply_query(int fd, int family, time_t now)
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;
@@ -1290,9 +1258,7 @@ void receive_query(struct listener *listen, time_t now)
struct cmsghdr *cmptr;
union {
struct cmsghdr align; /* this ensures alignment */
#ifdef HAVE_IPV6
char control6[CMSG_SPACE(sizeof(struct in6_pktinfo))];
#endif
#if defined(HAVE_LINUX_NETWORK)
char control[CMSG_SPACE(sizeof(struct in_pktinfo))];
#elif defined(IP_RECVDSTADDR) && defined(HAVE_SOLARIS_NETWORK)
@@ -1303,12 +1269,8 @@ void receive_query(struct listener *listen, time_t now)
CMSG_SPACE(sizeof(struct sockaddr_dl))];
#endif
} 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 */
daemon->srv_save = NULL;
@@ -1359,7 +1321,6 @@ void receive_query(struct listener *listen, time_t now)
if (source_addr.in.sin_port == 0)
return;
}
#ifdef HAVE_IPV6
else
{
/* Source-port == 0 is an error, we can't send back to that. */
@@ -1367,13 +1328,12 @@ void receive_query(struct listener *listen, time_t now)
return;
source_addr.in6.sin6_flowinfo = 0;
}
#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 (listen->family == AF_INET6)
{
for (addr = daemon->interface_addrs; addr; addr = addr->next)
@@ -1382,7 +1342,6 @@ void receive_query(struct listener *listen, time_t now)
break;
}
else
#endif
{
struct in_addr netmask;
for (addr = daemon->interface_addrs; addr; addr = addr->next)
@@ -1451,7 +1410,6 @@ void receive_query(struct listener *listen, time_t now)
}
#endif
#ifdef HAVE_IPV6
if (listen->family == AF_INET6)
{
for (cmptr = CMSG_FIRSTHDR(&msg); cmptr; cmptr = CMSG_NXTHDR(&msg, cmptr))
@@ -1467,7 +1425,6 @@ void receive_query(struct listener *listen, time_t now)
if_index = p.p->ipi6_ifindex;
}
}
#endif
/* enforce available interface configuration */
@@ -1531,11 +1488,9 @@ void receive_query(struct listener *listen, time_t now)
if (listen->family == AF_INET)
log_query(F_QUERY | F_IPV4 | F_FORWARD, daemon->namebuff,
(struct all_addr *)&source_addr.in.sin_addr, types);
#ifdef HAVE_IPV6
else
log_query(F_QUERY | F_IPV6 | F_FORWARD, daemon->namebuff,
(struct all_addr *)&source_addr.in6.sin6_addr, types);
#endif
#ifdef HAVE_AUTH
/* find queries for zones we're authoritative for, and answer them directly */
@@ -1744,11 +1699,9 @@ static int tcp_key_recurse(time_t now, int status, struct dns_header *header, si
if (server->addr.sa.sa_family == AF_INET)
log_query(F_NOEXTRA | F_DNSSEC | F_IPV4, keyname, (struct all_addr *)&(server->addr.in.sin_addr),
querystr("dnssec-query", new_status == STAT_NEED_KEY ? T_DNSKEY : T_DS));
#ifdef HAVE_IPV6
else
log_query(F_NOEXTRA | F_DNSSEC | F_IPV6, keyname, (struct all_addr *)&(server->addr.in6.sin6_addr),
querystr("dnssec-query", new_status == STAT_NEED_KEY ? T_DNSKEY : T_DS));
#endif
server->flags |= SERV_GOT_TCP;
@@ -1813,11 +1766,10 @@ unsigned char *tcp_request(int confd, time_t now,
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);
@@ -1828,7 +1780,7 @@ unsigned char *tcp_request(int confd, time_t now,
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)
@@ -1837,7 +1789,6 @@ unsigned char *tcp_request(int confd, time_t now,
break;
}
else
#endif
{
struct in_addr netmask;
for (addr = daemon->interface_addrs; addr; addr = addr->next)
@@ -1892,11 +1843,9 @@ unsigned char *tcp_request(int confd, time_t now,
if (peer_addr.sa.sa_family == AF_INET)
log_query(F_QUERY | F_IPV4 | F_FORWARD, daemon->namebuff,
(struct all_addr *)&peer_addr.in.sin_addr, types);
#ifdef HAVE_IPV6
else
log_query(F_QUERY | F_IPV6 | F_FORWARD, daemon->namebuff,
(struct all_addr *)&peer_addr.in6.sin6_addr, types);
#endif
#ifdef HAVE_AUTH
/* find queries for zones we're authoritative for, and answer them directly */
@@ -2072,11 +2021,9 @@ unsigned char *tcp_request(int confd, time_t now,
if (last_server->addr.sa.sa_family == AF_INET)
log_query(F_SERVER | F_IPV4 | F_FORWARD, daemon->namebuff,
(struct all_addr *)&last_server->addr.in.sin_addr, NULL);
#ifdef HAVE_IPV6
else
log_query(F_SERVER | F_IPV6 | F_FORWARD, daemon->namebuff,
(struct all_addr *)&last_server->addr.in6.sin6_addr, NULL);
#endif
#ifdef HAVE_DNSSEC
if (option_bool(OPT_DNSSEC_VALID) && !checking_disabled && (last_server->flags & SERV_DO_DNSSEC))
@@ -2175,9 +2122,7 @@ static struct frec *allocate_frec(time_t now)
f->sentto = NULL;
f->rfd4 = NULL;
f->flags = 0;
#ifdef HAVE_IPV6
f->rfd6 = NULL;
#endif
#ifdef HAVE_DNSSEC
f->dependent = NULL;
f->blocking_query = NULL;
@@ -2237,11 +2182,8 @@ static void free_frec(struct frec *f)
f->rfd4 = NULL;
f->sentto = NULL;
f->flags = 0;
#ifdef HAVE_IPV6
free_rfd(f->rfd6);
f->rfd6 = NULL;
#endif
#ifdef HAVE_DNSSEC
if (f->stash)