/* SPDX-License-Identifier: LGPL-2.1+ */
-/***
- This file is part of systemd.
-
- Copyright 2015 Daniel Mack
- ***/
#include <resolv.h>
#include <netinet/in.h>
return 0;
}
-static int mdns_rr_compare(const void *a, const void *b) {
- DnsResourceRecord **x = (DnsResourceRecord**) a, **y = (DnsResourceRecord**) b;
+static int mdns_rr_compare(DnsResourceRecord * const *a, DnsResourceRecord * const *b) {
+ DnsResourceRecord *x = *(DnsResourceRecord **) a, *y = *(DnsResourceRecord **) b;
size_t m;
int r;
assert(x);
- assert(*x);
assert(y);
- assert(*y);
- if (CLEAR_CACHE_FLUSH((*x)->key->class) < CLEAR_CACHE_FLUSH((*y)->key->class))
- return -1;
- else if (CLEAR_CACHE_FLUSH((*x)->key->class) > CLEAR_CACHE_FLUSH((*y)->key->class))
- return 1;
+ r = CMP(CLEAR_CACHE_FLUSH(x->key->class), CLEAR_CACHE_FLUSH(y->key->class));
+ if (r != 0)
+ return r;
- if ((*x)->key->type < (*y)->key->type)
- return -1;
- else if ((*x)->key->type > (*y)->key->type)
- return 1;
+ r = CMP(x->key->type, y->key->type);
+ if (r != 0)
+ return r;
- r = dns_resource_record_to_wire_format(*x, false);
+ r = dns_resource_record_to_wire_format(x, false);
if (r < 0) {
log_warning_errno(r, "Can't wire-format RR: %m");
return 0;
}
- r = dns_resource_record_to_wire_format(*y, false);
+ r = dns_resource_record_to_wire_format(y, false);
if (r < 0) {
log_warning_errno(r, "Can't wire-format RR: %m");
return 0;
}
- m = MIN(DNS_RESOURCE_RECORD_RDATA_SIZE(*x), DNS_RESOURCE_RECORD_RDATA_SIZE(*y));
+ m = MIN(DNS_RESOURCE_RECORD_RDATA_SIZE(x), DNS_RESOURCE_RECORD_RDATA_SIZE(y));
- r = memcmp(DNS_RESOURCE_RECORD_RDATA(*x), DNS_RESOURCE_RECORD_RDATA(*y), m);
+ r = memcmp(DNS_RESOURCE_RECORD_RDATA(x), DNS_RESOURCE_RECORD_RDATA(y), m);
if (r != 0)
return r;
- if (DNS_RESOURCE_RECORD_RDATA_SIZE(*x) < DNS_RESOURCE_RECORD_RDATA_SIZE(*y))
- return -1;
- else if (DNS_RESOURCE_RECORD_RDATA_SIZE(*x) > DNS_RESOURCE_RECORD_RDATA_SIZE(*y))
- return 1;
-
- return 0;
+ return CMP(DNS_RESOURCE_RECORD_RDATA_SIZE(x), DNS_RESOURCE_RECORD_RDATA_SIZE(y));
}
static int proposed_rrs_cmp(DnsResourceRecord **x, unsigned x_size, DnsResourceRecord **y, unsigned y_size) {
return r;
}
- if (x_size < y_size)
- return -1;
- if (x_size > y_size)
- return 1;
-
- return 0;
+ return CMP(x_size, y_size);
}
static int mdns_packet_extract_matching_rrs(DnsPacket *p, DnsResourceKey *key, DnsResourceRecord ***ret_rrs) {
list[n++] = p->answer->items[i].rr;
}
assert(n == size);
- qsort_safe(list, size, sizeof(DnsResourceRecord*), mdns_rr_compare);
+ typesafe_qsort(list, size, mdns_rr_compare);
*ret_rrs = TAKE_PTR(list);
DNS_ANSWER_FOREACH(rr, answer)
our[i++] = rr;
- qsort_safe(our, size, sizeof(DnsResourceRecord*), mdns_rr_compare);
+
+ typesafe_qsort(our, size, mdns_rr_compare);
r = mdns_packet_extract_matching_rrs(p, key, &remote);
if (r < 0)
if (r < 0)
return log_debug_errno(r, "Failed to build reply packet: %m");
- if (!ratelimit_test(&s->ratelimit))
+ if (!ratelimit_below(&s->ratelimit))
return 0;
r = dns_scope_emit_udp(s, -1, reply);
.in.sin_family = AF_INET,
.in.sin_port = htobe16(MDNS_PORT),
};
- static const int one = 1, pmtu = IP_PMTUDISC_DONT, ttl = 255;
+ _cleanup_close_ int s = -1;
int r;
assert(m);
if (m->mdns_ipv4_fd >= 0)
return m->mdns_ipv4_fd;
- m->mdns_ipv4_fd = socket(AF_INET, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
- if (m->mdns_ipv4_fd < 0)
+ s = socket(AF_INET, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
+ if (s < 0)
return log_error_errno(errno, "mDNS-IPv4: Failed to create socket: %m");
- r = setsockopt(m->mdns_ipv4_fd, IPPROTO_IP, IP_TTL, &ttl, sizeof(ttl));
- if (r < 0) {
- r = log_error_errno(errno, "mDNS-IPv4: Failed to set IP_TTL: %m");
- goto fail;
- }
+ r = setsockopt_int(s, IPPROTO_IP, IP_TTL, 255);
+ if (r < 0)
+ return log_error_errno(r, "mDNS-IPv4: Failed to set IP_TTL: %m");
- r = setsockopt(m->mdns_ipv4_fd, IPPROTO_IP, IP_MULTICAST_TTL, &ttl, sizeof(ttl));
- if (r < 0) {
- r = log_error_errno(errno, "mDNS-IPv4: Failed to set IP_MULTICAST_TTL: %m");
- goto fail;
- }
+ r = setsockopt_int(s, IPPROTO_IP, IP_MULTICAST_TTL, 255);
+ if (r < 0)
+ return log_error_errno(r, "mDNS-IPv4: Failed to set IP_MULTICAST_TTL: %m");
- r = setsockopt(m->mdns_ipv4_fd, IPPROTO_IP, IP_MULTICAST_LOOP, &one, sizeof(one));
- if (r < 0) {
- r = log_error_errno(errno, "mDNS-IPv4: Failed to set IP_MULTICAST_LOOP: %m");
- goto fail;
- }
+ r = setsockopt_int(s, IPPROTO_IP, IP_MULTICAST_LOOP, true);
+ if (r < 0)
+ return log_error_errno(r, "mDNS-IPv4: Failed to set IP_MULTICAST_LOOP: %m");
- r = setsockopt(m->mdns_ipv4_fd, IPPROTO_IP, IP_PKTINFO, &one, sizeof(one));
- if (r < 0) {
- r = log_error_errno(errno, "mDNS-IPv4: Failed to set IP_PKTINFO: %m");
- goto fail;
- }
+ r = setsockopt_int(s, IPPROTO_IP, IP_PKTINFO, true);
+ if (r < 0)
+ return log_error_errno(r, "mDNS-IPv4: Failed to set IP_PKTINFO: %m");
- r = setsockopt(m->mdns_ipv4_fd, IPPROTO_IP, IP_RECVTTL, &one, sizeof(one));
- if (r < 0) {
- r = log_error_errno(errno, "mDNS-IPv4: Failed to set IP_RECVTTL: %m");
- goto fail;
- }
+ r = setsockopt_int(s, IPPROTO_IP, IP_RECVTTL, true);
+ if (r < 0)
+ return log_error_errno(r, "mDNS-IPv4: Failed to set IP_RECVTTL: %m");
/* Disable Don't-Fragment bit in the IP header */
- r = setsockopt(m->mdns_ipv4_fd, IPPROTO_IP, IP_MTU_DISCOVER, &pmtu, sizeof(pmtu));
- if (r < 0) {
- r = log_error_errno(errno, "mDNS-IPv4: Failed to set IP_MTU_DISCOVER: %m");
- goto fail;
- }
+ r = setsockopt_int(s, IPPROTO_IP, IP_MTU_DISCOVER, IP_PMTUDISC_DONT);
+ if (r < 0)
+ return log_error_errno(r, "mDNS-IPv4: Failed to set IP_MTU_DISCOVER: %m");
/* See the section 15.1 of RFC6762 */
/* first try to bind without SO_REUSEADDR to detect another mDNS responder */
- r = bind(m->mdns_ipv4_fd, &sa.sa, sizeof(sa.in));
+ r = bind(s, &sa.sa, sizeof(sa.in));
if (r < 0) {
- if (errno != EADDRINUSE) {
- r = log_error_errno(errno, "mDNS-IPv4: Failed to bind socket: %m");
- goto fail;
- }
+ if (errno != EADDRINUSE)
+ return log_error_errno(errno, "mDNS-IPv4: Failed to bind socket: %m");
log_warning("mDNS-IPv4: There appears to be another mDNS responder running, or previously systemd-resolved crashed with some outstanding transfers.");
/* try again with SO_REUSEADDR */
- r = setsockopt(m->mdns_ipv4_fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one));
- if (r < 0) {
- r = log_error_errno(errno, "mDNS-IPv4: Failed to set SO_REUSEADDR: %m");
- goto fail;
- }
+ r = setsockopt_int(s, SOL_SOCKET, SO_REUSEADDR, true);
+ if (r < 0)
+ return log_error_errno(r, "mDNS-IPv4: Failed to set SO_REUSEADDR: %m");
- r = bind(m->mdns_ipv4_fd, &sa.sa, sizeof(sa.in));
- if (r < 0) {
- r = log_error_errno(errno, "mDNS-IPv4: Failed to bind socket: %m");
- goto fail;
- }
+ r = bind(s, &sa.sa, sizeof(sa.in));
+ if (r < 0)
+ return log_error_errno(errno, "mDNS-IPv4: Failed to bind socket: %m");
} else {
/* enable SO_REUSEADDR for the case that the user really wants multiple mDNS responders */
- r = setsockopt(m->mdns_ipv4_fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one));
- if (r < 0) {
- r = log_error_errno(errno, "mDNS-IPv4: Failed to set SO_REUSEADDR: %m");
- goto fail;
- }
+ r = setsockopt_int(s, SOL_SOCKET, SO_REUSEADDR, true);
+ if (r < 0)
+ return log_error_errno(r, "mDNS-IPv4: Failed to set SO_REUSEADDR: %m");
}
- r = sd_event_add_io(m->event, &m->mdns_ipv4_event_source, m->mdns_ipv4_fd, EPOLLIN, on_mdns_packet, m);
+ r = sd_event_add_io(m->event, &m->mdns_ipv4_event_source, s, EPOLLIN, on_mdns_packet, m);
if (r < 0)
- goto fail;
+ return log_error_errno(r, "mDNS-IPv4: Failed to create event source: %m");
- return m->mdns_ipv4_fd;
-
-fail:
- m->mdns_ipv4_fd = safe_close(m->mdns_ipv4_fd);
- return r;
+ return m->mdns_ipv4_fd = TAKE_FD(s);
}
int manager_mdns_ipv6_fd(Manager *m) {
.in6.sin6_family = AF_INET6,
.in6.sin6_port = htobe16(MDNS_PORT),
};
- static const int one = 1, ttl = 255;
+ _cleanup_close_ int s = -1;
int r;
assert(m);
if (m->mdns_ipv6_fd >= 0)
return m->mdns_ipv6_fd;
- m->mdns_ipv6_fd = socket(AF_INET6, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
- if (m->mdns_ipv6_fd < 0)
+ s = socket(AF_INET6, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
+ if (s < 0)
return log_error_errno(errno, "mDNS-IPv6: Failed to create socket: %m");
- r = setsockopt(m->mdns_ipv6_fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS, &ttl, sizeof(ttl));
- if (r < 0) {
- r = log_error_errno(errno, "mDNS-IPv6: Failed to set IPV6_UNICAST_HOPS: %m");
- goto fail;
- }
+ r = setsockopt_int(s, IPPROTO_IPV6, IPV6_UNICAST_HOPS, 255);
+ if (r < 0)
+ return log_error_errno(r, "mDNS-IPv6: Failed to set IPV6_UNICAST_HOPS: %m");
/* RFC 4795, section 2.5 recommends setting the TTL of UDP packets to 255. */
- r = setsockopt(m->mdns_ipv6_fd, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &ttl, sizeof(ttl));
- if (r < 0) {
- r = log_error_errno(errno, "mDNS-IPv6: Failed to set IPV6_MULTICAST_HOPS: %m");
- goto fail;
- }
+ r = setsockopt_int(s, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, 255);
+ if (r < 0)
+ return log_error_errno(r, "mDNS-IPv6: Failed to set IPV6_MULTICAST_HOPS: %m");
- r = setsockopt(m->mdns_ipv6_fd, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, &one, sizeof(one));
- if (r < 0) {
- r = log_error_errno(errno, "mDNS-IPv6: Failed to set IPV6_MULTICAST_LOOP: %m");
- goto fail;
- }
+ r = setsockopt_int(s, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, true);
+ if (r < 0)
+ return log_error_errno(r, "mDNS-IPv6: Failed to set IPV6_MULTICAST_LOOP: %m");
- r = setsockopt(m->mdns_ipv6_fd, IPPROTO_IPV6, IPV6_V6ONLY, &one, sizeof(one));
- if (r < 0) {
- r = log_error_errno(errno, "mDNS-IPv6: Failed to set IPV6_V6ONLY: %m");
- goto fail;
- }
+ r = setsockopt_int(s, IPPROTO_IPV6, IPV6_V6ONLY, true);
+ if (r < 0)
+ return log_error_errno(r, "mDNS-IPv6: Failed to set IPV6_V6ONLY: %m");
- r = setsockopt(m->mdns_ipv6_fd, IPPROTO_IPV6, IPV6_RECVPKTINFO, &one, sizeof(one));
- if (r < 0) {
- r = log_error_errno(errno, "mDNS-IPv6: Failed to set IPV6_RECVPKTINFO: %m");
- goto fail;
- }
+ r = setsockopt_int(s, IPPROTO_IPV6, IPV6_RECVPKTINFO, true);
+ if (r < 0)
+ return log_error_errno(r, "mDNS-IPv6: Failed to set IPV6_RECVPKTINFO: %m");
- r = setsockopt(m->mdns_ipv6_fd, IPPROTO_IPV6, IPV6_RECVHOPLIMIT, &one, sizeof(one));
- if (r < 0) {
- r = log_error_errno(errno, "mDNS-IPv6: Failed to set IPV6_RECVHOPLIMIT: %m");
- goto fail;
- }
+ r = setsockopt_int(s, IPPROTO_IPV6, IPV6_RECVHOPLIMIT, true);
+ if (r < 0)
+ return log_error_errno(r, "mDNS-IPv6: Failed to set IPV6_RECVHOPLIMIT: %m");
/* See the section 15.1 of RFC6762 */
/* first try to bind without SO_REUSEADDR to detect another mDNS responder */
- r = bind(m->mdns_ipv6_fd, &sa.sa, sizeof(sa.in6));
+ r = bind(s, &sa.sa, sizeof(sa.in6));
if (r < 0) {
- if (errno != EADDRINUSE) {
- r = log_error_errno(errno, "mDNS-IPv6: Failed to bind socket: %m");
- goto fail;
- }
+ if (errno != EADDRINUSE)
+ return log_error_errno(errno, "mDNS-IPv6: Failed to bind socket: %m");
log_warning("mDNS-IPv6: There appears to be another mDNS responder running, or previously systemd-resolved crashed with some outstanding transfers.");
/* try again with SO_REUSEADDR */
- r = setsockopt(m->mdns_ipv6_fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one));
- if (r < 0) {
- r = log_error_errno(errno, "mDNS-IPv6: Failed to set SO_REUSEADDR: %m");
- goto fail;
- }
+ r = setsockopt_int(s, SOL_SOCKET, SO_REUSEADDR, true);
+ if (r < 0)
+ return log_error_errno(r, "mDNS-IPv6: Failed to set SO_REUSEADDR: %m");
- r = bind(m->mdns_ipv6_fd, &sa.sa, sizeof(sa.in6));
- if (r < 0) {
- r = log_error_errno(errno, "mDNS-IPv6: Failed to bind socket: %m");
- goto fail;
- }
+ r = bind(s, &sa.sa, sizeof(sa.in6));
+ if (r < 0)
+ return log_error_errno(errno, "mDNS-IPv6: Failed to bind socket: %m");
} else {
/* enable SO_REUSEADDR for the case that the user really wants multiple mDNS responders */
- r = setsockopt(m->mdns_ipv6_fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one));
- if (r < 0) {
- r = log_error_errno(errno, "mDNS-IPv6: Failed to set SO_REUSEADDR: %m");
- goto fail;
- }
+ r = setsockopt_int(s, SOL_SOCKET, SO_REUSEADDR, true);
+ if (r < 0)
+ return log_error_errno(r, "mDNS-IPv6: Failed to set SO_REUSEADDR: %m");
}
- r = sd_event_add_io(m->event, &m->mdns_ipv6_event_source, m->mdns_ipv6_fd, EPOLLIN, on_mdns_packet, m);
+ r = sd_event_add_io(m->event, &m->mdns_ipv6_event_source, s, EPOLLIN, on_mdns_packet, m);
if (r < 0)
- goto fail;
+ return log_error_errno(r, "mDNS-IPv6: Failed to create event source: %m");
- return m->mdns_ipv6_fd;
-
-fail:
- m->mdns_ipv6_fd = safe_close(m->mdns_ipv6_fd);
- return r;
+ return m->mdns_ipv6_fd = TAKE_FD(s);
}
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