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resolved-llmnr: use TAKE_FD()

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This commit is contained in:
Yu Watanabe 2018-10-19 05:58:03 +09:00
parent 9e5b649655
commit 3f548ffff4
1 changed files with 140 additions and 228 deletions
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368
src/resolve/resolved-llmnr.c
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@ -115,6 +115,7 @@ int manager_llmnr_ipv4_udp_fd(Manager *m) {
.in.sin_family = AF_INET,
.in.sin_port = htobe16(LLMNR_PORT),
};
_cleanup_close_ int s = -1;
int r;
assert(m);
@ -122,90 +123,66 @@ int manager_llmnr_ipv4_udp_fd(Manager *m) {
if (m->llmnr_ipv4_udp_fd >= 0)
return m->llmnr_ipv4_udp_fd;
m->llmnr_ipv4_udp_fd = socket(AF_INET, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
if (m->llmnr_ipv4_udp_fd < 0)
s = socket(AF_INET, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
if (s < 0)
return log_error_errno(errno, "LLMNR-IPv4(UDP): Failed to create socket: %m");
/* RFC 4795, section 2.5 recommends setting the TTL of UDP packets to 255. */
r = setsockopt_int(m->llmnr_ipv4_udp_fd, IPPROTO_IP, IP_TTL, 255);
if (r < 0) {
log_error_errno(r, "LLMNR-IPv4(UDP): 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, "LLMNR-IPv4(UDP): Failed to set IP_TTL: %m");
r = setsockopt_int(m->llmnr_ipv4_udp_fd, IPPROTO_IP, IP_MULTICAST_TTL, 255);
if (r < 0) {
log_error_errno(r, "LLMNR-IPv4(UDP): 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, "LLMNR-IPv4(UDP): Failed to set IP_MULTICAST_TTL: %m");
r = setsockopt_int(m->llmnr_ipv4_udp_fd, IPPROTO_IP, IP_MULTICAST_LOOP, true);
if (r < 0) {
log_error_errno(r, "LLMNR-IPv4(UDP): 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, "LLMNR-IPv4(UDP): Failed to set IP_MULTICAST_LOOP: %m");
r = setsockopt_int(m->llmnr_ipv4_udp_fd, IPPROTO_IP, IP_PKTINFO, true);
if (r < 0) {
log_error_errno(r, "LLMNR-IPv4(UDP): 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, "LLMNR-IPv4(UDP): Failed to set IP_PKTINFO: %m");
r = setsockopt_int(m->llmnr_ipv4_udp_fd, IPPROTO_IP, IP_RECVTTL, true);
if (r < 0) {
log_error_errno(r, "LLMNR-IPv4(UDP): 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, "LLMNR-IPv4(UDP): Failed to set IP_RECVTTL: %m");
/* Disable Don't-Fragment bit in the IP header */
r = setsockopt_int(m->llmnr_ipv4_udp_fd, IPPROTO_IP, IP_MTU_DISCOVER, IP_PMTUDISC_DONT);
if (r < 0) {
log_error_errno(r, "LLMNR-IPv4(UDP): 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, "LLMNR-IPv4(UDP): Failed to set IP_MTU_DISCOVER: %m");
/* first try to bind without SO_REUSEADDR to detect another LLMNR responder */
r = bind(m->llmnr_ipv4_udp_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, "LLMNR-IPv4(UDP): Failed to bind socket: %m");
goto fail;
}
if (errno != EADDRINUSE)
return log_error_errno(errno, "LLMNR-IPv4(UDP): Failed to bind socket: %m");
log_warning("LLMNR-IPv4(UDP): There appears to be another LLMNR responder running, or previously systemd-resolved crashed with some outstanding transfers.");
/* try again with SO_REUSEADDR */
r = setsockopt_int(m->llmnr_ipv4_udp_fd, SOL_SOCKET, SO_REUSEADDR, true);
if (r < 0) {
log_error_errno(r, "LLMNR-IPv4(UDP): 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, "LLMNR-IPv4(UDP): Failed to set SO_REUSEADDR: %m");
r = bind(m->llmnr_ipv4_udp_fd, &sa.sa, sizeof(sa.in));
if (r < 0) {
r = log_error_errno(errno, "LLMNR-IPv4(UDP): Failed to bind socket: %m");
goto fail;
}
r = bind(s, &sa.sa, sizeof(sa.in));
if (r < 0)
return log_error_errno(errno, "LLMNR-IPv4(UDP): Failed to bind socket: %m");
} else {
/* enable SO_REUSEADDR for the case that the user really wants multiple LLMNR responders */
r = setsockopt_int(m->llmnr_ipv4_udp_fd, SOL_SOCKET, SO_REUSEADDR, true);
if (r < 0) {
log_error_errno(r, "LLMNR-IPv4(UDP): 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, "LLMNR-IPv4(UDP): Failed to set SO_REUSEADDR: %m");
}
r = sd_event_add_io(m->event, &m->llmnr_ipv4_udp_event_source, m->llmnr_ipv4_udp_fd, EPOLLIN, on_llmnr_packet, m);
r = sd_event_add_io(m->event, &m->llmnr_ipv4_udp_event_source, s, EPOLLIN, on_llmnr_packet, m);
if (r < 0)
goto fail;
return log_error_errno(r, "LLMNR-IPv4(UDP): Failed to create event source: %m");
(void) sd_event_source_set_description(m->llmnr_ipv4_udp_event_source, "llmnr-ipv4-udp");
return m->llmnr_ipv4_udp_fd;
fail:
m->llmnr_ipv4_udp_fd = safe_close(m->llmnr_ipv4_udp_fd);
return r;
return m->llmnr_ipv4_udp_fd = TAKE_FD(s);
}
int manager_llmnr_ipv6_udp_fd(Manager *m) {
@ -213,6 +190,7 @@ int manager_llmnr_ipv6_udp_fd(Manager *m) {
.in6.sin6_family = AF_INET6,
.in6.sin6_port = htobe16(LLMNR_PORT),
};
_cleanup_close_ int s = -1;
int r;
assert(m);
@ -220,89 +198,65 @@ int manager_llmnr_ipv6_udp_fd(Manager *m) {
if (m->llmnr_ipv6_udp_fd >= 0)
return m->llmnr_ipv6_udp_fd;
m->llmnr_ipv6_udp_fd = socket(AF_INET6, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
if (m->llmnr_ipv6_udp_fd < 0)
s = socket(AF_INET6, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
if (s < 0)
return log_error_errno(errno, "LLMNR-IPv6(UDP): Failed to create socket: %m");
r = setsockopt_int(m->llmnr_ipv6_udp_fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS, 255);
if (r < 0) {
log_error_errno(r, "LLMNR-IPv6(UDP): 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, "LLMNR-IPv6(UDP): Failed to set IPV6_UNICAST_HOPS: %m");
/* RFC 4795, section 2.5 recommends setting the TTL of UDP packets to 255. */
r = setsockopt_int(m->llmnr_ipv6_udp_fd, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, 255);
if (r < 0) {
log_error_errno(r, "LLMNR-IPv6(UDP): 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, "LLMNR-IPv6(UDP): Failed to set IPV6_MULTICAST_HOPS: %m");
r = setsockopt_int(m->llmnr_ipv6_udp_fd, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, true);
if (r < 0) {
log_error_errno(r, "LLMNR-IPv6(UDP): 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, "LLMNR-IPv6(UDP): Failed to set IPV6_MULTICAST_LOOP: %m");
r = setsockopt_int(m->llmnr_ipv6_udp_fd, IPPROTO_IPV6, IPV6_V6ONLY, true);
if (r < 0) {
log_error_errno(r, "LLMNR-IPv6(UDP): 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, "LLMNR-IPv6(UDP): Failed to set IPV6_V6ONLY: %m");
r = setsockopt_int(m->llmnr_ipv6_udp_fd, IPPROTO_IPV6, IPV6_RECVPKTINFO, true);
if (r < 0) {
log_error_errno(r, "LLMNR-IPv6(UDP): 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, "LLMNR-IPv6(UDP): Failed to set IPV6_RECVPKTINFO: %m");
r = setsockopt_int(m->llmnr_ipv6_udp_fd, IPPROTO_IPV6, IPV6_RECVHOPLIMIT, true);
if (r < 0) {
log_error_errno(r, "LLMNR-IPv6(UDP): 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, "LLMNR-IPv6(UDP): Failed to set IPV6_RECVHOPLIMIT: %m");
/* first try to bind without SO_REUSEADDR to detect another LLMNR responder */
r = bind(m->llmnr_ipv6_udp_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, "LLMNR-IPv6(UDP): Failed to bind socket: %m");
goto fail;
}
if (errno != EADDRINUSE)
return log_error_errno(errno, "LLMNR-IPv6(UDP): Failed to bind socket: %m");
log_warning("LLMNR-IPv6(UDP): There appears to be another LLMNR responder running, or previously systemd-resolved crashed with some outstanding transfers.");
/* try again with SO_REUSEADDR */
r = setsockopt_int(m->llmnr_ipv6_udp_fd, SOL_SOCKET, SO_REUSEADDR, true);
if (r < 0) {
log_error_errno(r, "LLMNR-IPv6(UDP): 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, "LLMNR-IPv6(UDP): Failed to set SO_REUSEADDR: %m");
r = bind(m->llmnr_ipv6_udp_fd, &sa.sa, sizeof(sa.in6));
if (r < 0) {
r = log_error_errno(errno, "LLMNR-IPv6(UDP): Failed to bind socket: %m");
goto fail;
}
r = bind(s, &sa.sa, sizeof(sa.in6));
if (r < 0)
return log_error_errno(errno, "LLMNR-IPv6(UDP): Failed to bind socket: %m");
} else {
/* enable SO_REUSEADDR for the case that the user really wants multiple LLMNR responders */
r = setsockopt_int(m->llmnr_ipv6_udp_fd, SOL_SOCKET, SO_REUSEADDR, true);
if (r < 0) {
log_error_errno(r, "LLMNR-IPv6(UDP): 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, "LLMNR-IPv6(UDP): Failed to set SO_REUSEADDR: %m");
}
r = sd_event_add_io(m->event, &m->llmnr_ipv6_udp_event_source, m->llmnr_ipv6_udp_fd, EPOLLIN, on_llmnr_packet, m);
r = sd_event_add_io(m->event, &m->llmnr_ipv6_udp_event_source, s, EPOLLIN, on_llmnr_packet, m);
if (r < 0)
goto fail;
return log_error_errno(r, "LLMNR-IPv6(UDP): Failed to create event source: %m");
(void) sd_event_source_set_description(m->llmnr_ipv6_udp_event_source, "llmnr-ipv6-udp");
return m->llmnr_ipv6_udp_fd;
fail:
m->llmnr_ipv6_udp_fd = safe_close(m->llmnr_ipv6_udp_fd);
return r;
return m->llmnr_ipv6_udp_fd = TAKE_FD(s);
}
static int on_llmnr_stream_packet(DnsStream *s) {
@ -353,6 +307,7 @@ int manager_llmnr_ipv4_tcp_fd(Manager *m) {
.in.sin_family = AF_INET,
.in.sin_port = htobe16(LLMNR_PORT),
};
_cleanup_close_ int s = -1;
int r;
assert(m);
@ -360,84 +315,62 @@ int manager_llmnr_ipv4_tcp_fd(Manager *m) {
if (m->llmnr_ipv4_tcp_fd >= 0)
return m->llmnr_ipv4_tcp_fd;
m->llmnr_ipv4_tcp_fd = socket(AF_INET, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
if (m->llmnr_ipv4_tcp_fd < 0)
s = socket(AF_INET, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
if (s < 0)
return log_error_errno(errno, "LLMNR-IPv4(TCP): Failed to create socket: %m");
/* RFC 4795, section 2.5. requires setting the TTL of TCP streams to 1 */
r = setsockopt_int(m->llmnr_ipv4_tcp_fd, IPPROTO_IP, IP_TTL, true);
if (r < 0) {
log_error_errno(r, "LLMNR-IPv4(TCP): Failed to set IP_TTL: %m");
goto fail;
}
r = setsockopt_int(s, IPPROTO_IP, IP_TTL, true);
if (r < 0)
return log_error_errno(r, "LLMNR-IPv4(TCP): Failed to set IP_TTL: %m");
r = setsockopt_int(m->llmnr_ipv4_tcp_fd, IPPROTO_IP, IP_PKTINFO, true);
if (r < 0) {
log_error_errno(r, "LLMNR-IPv4(TCP): 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, "LLMNR-IPv4(TCP): Failed to set IP_PKTINFO: %m");
r = setsockopt_int(m->llmnr_ipv4_tcp_fd, IPPROTO_IP, IP_RECVTTL, true);
if (r < 0) {
log_error_errno(r, "LLMNR-IPv4(TCP): 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, "LLMNR-IPv4(TCP): Failed to set IP_RECVTTL: %m");
/* Disable Don't-Fragment bit in the IP header */
r = setsockopt_int(m->llmnr_ipv4_tcp_fd, IPPROTO_IP, IP_MTU_DISCOVER, IP_PMTUDISC_DONT);
if (r < 0) {
log_error_errno(r, "LLMNR-IPv4(TCP): 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, "LLMNR-IPv4(TCP): Failed to set IP_MTU_DISCOVER: %m");
/* first try to bind without SO_REUSEADDR to detect another LLMNR responder */
r = bind(m->llmnr_ipv4_tcp_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, "LLMNR-IPv4(TCP): Failed to bind socket: %m");
goto fail;
}
if (errno != EADDRINUSE)
return log_error_errno(errno, "LLMNR-IPv4(TCP): Failed to bind socket: %m");
log_warning("LLMNR-IPv4(TCP): There appears to be another LLMNR responder running, or previously systemd-resolved crashed with some outstanding transfers.");
/* try again with SO_REUSEADDR */
r = setsockopt_int(m->llmnr_ipv4_tcp_fd, SOL_SOCKET, SO_REUSEADDR, true);
if (r < 0) {
log_error_errno(r, "LLMNR-IPv4(TCP): 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, "LLMNR-IPv4(TCP): Failed to set SO_REUSEADDR: %m");
r = bind(m->llmnr_ipv4_tcp_fd, &sa.sa, sizeof(sa.in));
if (r < 0) {
r = log_error_errno(errno, "LLMNR-IPv4(TCP): Failed to bind socket: %m");
goto fail;
}
r = bind(s, &sa.sa, sizeof(sa.in));
if (r < 0)
return log_error_errno(errno, "LLMNR-IPv4(TCP): Failed to bind socket: %m");
} else {
/* enable SO_REUSEADDR for the case that the user really wants multiple LLMNR responders */
r = setsockopt_int(m->llmnr_ipv4_tcp_fd, SOL_SOCKET, SO_REUSEADDR, true);
if (r < 0) {
log_error_errno(r, "LLMNR-IPv4(TCP): 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, "LLMNR-IPv4(TCP): Failed to set SO_REUSEADDR: %m");
}
r = listen(m->llmnr_ipv4_tcp_fd, SOMAXCONN);
if (r < 0) {
r = log_error_errno(errno, "LLMNR-IPv4(TCP): Failed to listen the stream: %m");
goto fail;
}
r = sd_event_add_io(m->event, &m->llmnr_ipv4_tcp_event_source, m->llmnr_ipv4_tcp_fd, EPOLLIN, on_llmnr_stream, m);
r = listen(s, SOMAXCONN);
if (r < 0)
goto fail;
return log_error_errno(errno, "LLMNR-IPv4(TCP): Failed to listen the stream: %m");
r = sd_event_add_io(m->event, &m->llmnr_ipv4_tcp_event_source, s, EPOLLIN, on_llmnr_stream, m);
if (r < 0)
return log_error_errno(r, "LLMNR-IPv4(TCP): Failed to create event source: %m");
(void) sd_event_source_set_description(m->llmnr_ipv4_tcp_event_source, "llmnr-ipv4-tcp");
return m->llmnr_ipv4_tcp_fd;
fail:
m->llmnr_ipv4_tcp_fd = safe_close(m->llmnr_ipv4_tcp_fd);
return r;
return m->llmnr_ipv4_tcp_fd = TAKE_FD(s);
}
int manager_llmnr_ipv6_tcp_fd(Manager *m) {
@ -445,6 +378,7 @@ int manager_llmnr_ipv6_tcp_fd(Manager *m) {
.in6.sin6_family = AF_INET6,
.in6.sin6_port = htobe16(LLMNR_PORT),
};
_cleanup_close_ int s = -1;
int r;
assert(m);
@ -452,81 +386,59 @@ int manager_llmnr_ipv6_tcp_fd(Manager *m) {
if (m->llmnr_ipv6_tcp_fd >= 0)
return m->llmnr_ipv6_tcp_fd;
m->llmnr_ipv6_tcp_fd = socket(AF_INET6, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
if (m->llmnr_ipv6_tcp_fd < 0)
s = socket(AF_INET6, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
if (s < 0)
return log_error_errno(errno, "LLMNR-IPv6(TCP): Failed to create socket: %m");
/* RFC 4795, section 2.5. requires setting the TTL of TCP streams to 1 */
r = setsockopt_int(m->llmnr_ipv6_tcp_fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS, true);
if (r < 0) {
log_error_errno(r, "LLMNR-IPv6(TCP): Failed to set IPV6_UNICAST_HOPS: %m");
goto fail;
}
r = setsockopt_int(s, IPPROTO_IPV6, IPV6_UNICAST_HOPS, true);
if (r < 0)
return log_error_errno(r, "LLMNR-IPv6(TCP): Failed to set IPV6_UNICAST_HOPS: %m");
r = setsockopt_int(m->llmnr_ipv6_tcp_fd, IPPROTO_IPV6, IPV6_V6ONLY, true);
if (r < 0) {
log_error_errno(r, "LLMNR-IPv6(TCP): 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, "LLMNR-IPv6(TCP): Failed to set IPV6_V6ONLY: %m");
r = setsockopt_int(m->llmnr_ipv6_tcp_fd, IPPROTO_IPV6, IPV6_RECVPKTINFO, true);
if (r < 0) {
log_error_errno(r, "LLMNR-IPv6(TCP): 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, "LLMNR-IPv6(TCP): Failed to set IPV6_RECVPKTINFO: %m");
r = setsockopt_int(m->llmnr_ipv6_tcp_fd, IPPROTO_IPV6, IPV6_RECVHOPLIMIT, true);
if (r < 0) {
log_error_errno(r, "LLMNR-IPv6(TCP): 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, "LLMNR-IPv6(TCP): Failed to set IPV6_RECVHOPLIMIT: %m");
/* first try to bind without SO_REUSEADDR to detect another LLMNR responder */
r = bind(m->llmnr_ipv6_tcp_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, "LLMNR-IPv6(TCP): Failed to bind socket: %m");
goto fail;
}
if (errno != EADDRINUSE)
return log_error_errno(errno, "LLMNR-IPv6(TCP): Failed to bind socket: %m");
log_warning("LLMNR-IPv6(TCP): There appears to be another LLMNR responder running, or previously systemd-resolved crashed with some outstanding transfers.");
/* try again with SO_REUSEADDR */
r = setsockopt_int(m->llmnr_ipv6_tcp_fd, SOL_SOCKET, SO_REUSEADDR, true);
if (r < 0) {
log_error_errno(r, "LLMNR-IPv6(TCP): 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, "LLMNR-IPv6(TCP): Failed to set SO_REUSEADDR: %m");
r = bind(m->llmnr_ipv6_tcp_fd, &sa.sa, sizeof(sa.in6));
if (r < 0) {
r = log_error_errno(errno, "LLMNR-IPv6(TCP): Failed to bind socket: %m");
goto fail;
}
r = bind(s, &sa.sa, sizeof(sa.in6));
if (r < 0)
return log_error_errno(errno, "LLMNR-IPv6(TCP): Failed to bind socket: %m");
} else {
/* enable SO_REUSEADDR for the case that the user really wants multiple LLMNR responders */
r = setsockopt_int(m->llmnr_ipv6_tcp_fd, SOL_SOCKET, SO_REUSEADDR, true);
if (r < 0) {
log_error_errno(r, "LLMNR-IPv6(TCP): 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, "LLMNR-IPv6(TCP): Failed to set SO_REUSEADDR: %m");
}
r = listen(m->llmnr_ipv6_tcp_fd, SOMAXCONN);
if (r < 0) {
r = log_error_errno(errno, "LLMNR-IPv6(TCP): Failed to listen the stream: %m");
goto fail;
}
r = sd_event_add_io(m->event, &m->llmnr_ipv6_tcp_event_source, m->llmnr_ipv6_tcp_fd, EPOLLIN, on_llmnr_stream, m);
r = listen(s, SOMAXCONN);
if (r < 0)
goto fail;
return log_error_errno(errno, "LLMNR-IPv6(TCP): Failed to listen the stream: %m");
r = sd_event_add_io(m->event, &m->llmnr_ipv6_tcp_event_source, s, EPOLLIN, on_llmnr_stream, m);
if (r < 0)
return log_error_errno(r, "LLMNR-IPv6(TCP): Failed to create event source: %m");
(void) sd_event_source_set_description(m->llmnr_ipv6_tcp_event_source, "llmnr-ipv6-tcp");
return m->llmnr_ipv6_tcp_fd;
fail:
m->llmnr_ipv6_tcp_fd = safe_close(m->llmnr_ipv6_tcp_fd);
return r;
return m->llmnr_ipv6_tcp_fd = TAKE_FD(s);
}