#include <sys/time.h>
#include <net/if.h>
#include <sys/ioctl.h>
+#include <assert.h>
#include "dns.h"
-#include "util.h"
+#include "fdutil.h"
#include "socket.h"
#include "log.h"
static void mdns_mcast_group_ipv4(struct sockaddr_in *ret_sa) {
- g_assert(ret_sa);
+ assert(ret_sa);
memset(ret_sa, 0, sizeof(struct sockaddr_in));
-
ret_sa->sin_family = AF_INET;
ret_sa->sin_port = htons(AVAHI_MDNS_PORT);
- inet_pton(AF_INET, "224.0.0.251", &ret_sa->sin_addr);
+ inet_pton(AF_INET, AVAHI_IPV4_MCAST_GROUP, &ret_sa->sin_addr);
}
static void mdns_mcast_group_ipv6(struct sockaddr_in6 *ret_sa) {
-
- g_assert(ret_sa);
+ assert(ret_sa);
memset(ret_sa, 0, sizeof(struct sockaddr_in6));
-
ret_sa->sin6_family = AF_INET6;
ret_sa->sin6_port = htons(AVAHI_MDNS_PORT);
- inet_pton(AF_INET6, "ff02::fb", &ret_sa->sin6_addr);
+ inet_pton(AF_INET6, AVAHI_IPV6_MCAST_GROUP, &ret_sa->sin6_addr);
}
-static void ipv4_address_to_sockaddr(struct sockaddr_in *ret_sa, const AvahiIPv4Address *a, guint16 port) {
- g_assert(ret_sa);
- g_assert(a);
- g_assert(port > 0);
+static void ipv4_address_to_sockaddr(struct sockaddr_in *ret_sa, const AvahiIPv4Address *a, uint16_t port) {
+ assert(ret_sa);
+ assert(a);
+ assert(port > 0);
memset(ret_sa, 0, sizeof(struct sockaddr_in));
ret_sa->sin_family = AF_INET;
memcpy(&ret_sa->sin_addr, a, sizeof(AvahiIPv4Address));
}
-static void ipv6_address_to_sockaddr(struct sockaddr_in6 *ret_sa, const AvahiIPv6Address *a, guint16 port) {
- g_assert(ret_sa);
- g_assert(a);
- g_assert(port > 0);
+static void ipv6_address_to_sockaddr(struct sockaddr_in6 *ret_sa, const AvahiIPv6Address *a, uint16_t port) {
+ assert(ret_sa);
+ assert(a);
+ assert(port > 0);
memset(ret_sa, 0, sizeof(struct sockaddr_in6));
ret_sa->sin6_family = AF_INET6;
memcpy(&ret_sa->sin6_addr, a, sizeof(AvahiIPv6Address));
}
-int avahi_mdns_mcast_join_ipv4 (int index, int fd) {
+int avahi_mdns_mcast_join_ipv4(int fd, int idx) {
struct ip_mreqn mreq;
struct sockaddr_in sa;
memset(&mreq, 0, sizeof(mreq));
mreq.imr_multiaddr = sa.sin_addr;
- mreq.imr_ifindex = index;
+ mreq.imr_ifindex = idx;
if (setsockopt(fd, SOL_IP, IP_ADD_MEMBERSHIP, &mreq, sizeof(mreq)) < 0) {
avahi_log_warn("IP_ADD_MEMBERSHIP failed: %s\n", strerror(errno));
return 0;
}
-int avahi_mdns_mcast_join_ipv6 (int index, int fd) {
+int avahi_mdns_mcast_join_ipv6(int fd, int idx) {
struct ipv6_mreq mreq6;
struct sockaddr_in6 sa6;
memset(&mreq6, 0, sizeof(mreq6));
mreq6.ipv6mr_multiaddr = sa6.sin6_addr;
- mreq6.ipv6mr_interface = index;
+ mreq6.ipv6mr_interface = idx;
if (setsockopt(fd, SOL_IPV6, IPV6_ADD_MEMBERSHIP, &mreq6, sizeof(mreq6)) < 0) {
avahi_log_warn("IPV6_ADD_MEMBERSHIP failed: %s\n", strerror(errno));
return 0;
}
-int avahi_mdns_mcast_leave_ipv4 (int index, int fd) {
+int avahi_mdns_mcast_leave_ipv4(int fd, int idx) {
struct ip_mreqn mreq;
struct sockaddr_in sa;
memset(&mreq, 0, sizeof(mreq));
mreq.imr_multiaddr = sa.sin_addr;
- mreq.imr_ifindex = index;
+ mreq.imr_ifindex = idx;
if (setsockopt(fd, SOL_IP, IP_DROP_MEMBERSHIP, &mreq, sizeof(mreq)) < 0) {
avahi_log_warn("IP_DROP_MEMBERSHIP failed: %s\n", strerror(errno));
return 0;
}
-int avahi_mdns_mcast_leave_ipv6 (int index, int fd) {
+int avahi_mdns_mcast_leave_ipv6(int fd, int idx) {
struct ipv6_mreq mreq6;
struct sockaddr_in6 sa6;
memset(&mreq6, 0, sizeof(mreq6));
mreq6.ipv6mr_multiaddr = sa6.sin6_addr;
- mreq6.ipv6mr_interface = index;
+ mreq6.ipv6mr_interface = idx;
if (setsockopt(fd, SOL_IPV6, IPV6_DROP_MEMBERSHIP, &mreq6, sizeof(mreq6)) < 0) {
avahi_log_warn("IPV6_DROP_MEMBERSHIP failed: %s\n", strerror(errno));
return 0;
}
-gint avahi_open_socket_ipv4(void) {
+static int bind_with_warn(int fd, const struct sockaddr *sa, socklen_t l) {
+ int yes;
+
+ assert(fd >= 0);
+ assert(sa);
+ assert(l > 0);
+
+ if (bind(fd, sa, l) < 0) {
+
+ if (errno != EADDRINUSE) {
+ avahi_log_warn("bind() failed: %s\n", strerror(errno));
+ return -1;
+ }
+
+ avahi_log_warn("*** WARNING: Detected another %s mDNS stack running on this host. This makes mDNS unreliable and is thus not recommended. ***",
+ sa->sa_family == AF_INET ? "IPv4" : "IPv6");
+
+ /* Try again, this time with SO_REUSEADDR set */
+ yes = 1;
+ if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(yes)) < 0) {
+ avahi_log_warn("SO_REUSEADDR failed: %s\n", strerror(errno));
+ return -1;
+ }
+
+ if (bind(fd, sa, l) < 0) {
+ avahi_log_warn("bind() failed: %s\n", strerror(errno));
+ return -1;
+ }
+ } else {
+
+ /* We enable SO_REUSEADDR afterwards, to make sure that the
+ * user may run other mDNS implementations if he really
+ * wants. */
+
+ yes = 1;
+ if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(yes)) < 0) {
+ avahi_log_warn("SO_REUSEADDR failed: %s\n", strerror(errno));
+ return -1;
+ }
+ }
+
+ return 0;
+}
+
+int avahi_open_socket_ipv4(void) {
struct sockaddr_in local;
int fd = -1, ttl, yes;
goto fail;
}
- yes = 1;
- if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(yes)) < 0) {
- avahi_log_warn("SO_REUSEADDR failed: %s\n", strerror(errno));
- goto fail;
- }
-
yes = 1;
if (setsockopt(fd, SOL_IP, IP_MULTICAST_LOOP, &yes, sizeof(yes)) < 0) {
avahi_log_warn("IP_MULTICAST_LOOP failed: %s\n", strerror(errno));
goto fail;
}
-
memset(&local, 0, sizeof(local));
local.sin_family = AF_INET;
local.sin_port = htons(AVAHI_MDNS_PORT);
-
- if (bind(fd, (struct sockaddr*) &local, sizeof(local)) < 0) {
- avahi_log_warn("bind() failed: %s\n", strerror(errno));
+
+ if (bind_with_warn(fd, (struct sockaddr*) &local, sizeof(local)) < 0)
goto fail;
- }
yes = 1;
if (setsockopt(fd, SOL_IP, IP_RECVTTL, &yes, sizeof(yes)) < 0) {
return -1;
}
-gint avahi_open_socket_ipv6(void) {
+int avahi_open_socket_ipv6(void) {
struct sockaddr_in6 sa, local;
int fd = -1, ttl, yes;
goto fail;
}
- yes = 1;
- if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(yes)) < 0) {
- avahi_log_warn("SO_REUSEADDR failed: %s\n", strerror(errno));
- goto fail;
- }
-
yes = 1;
if (setsockopt(fd, SOL_IPV6, IPV6_V6ONLY, &yes, sizeof(yes)) < 0) {
avahi_log_warn("IPV6_V6ONLY failed: %s\n", strerror(errno));
local.sin6_family = AF_INET6;
local.sin6_port = htons(AVAHI_MDNS_PORT);
- if (bind(fd, (struct sockaddr*) &local, sizeof(local)) < 0) {
- avahi_log_warn("bind() failed: %s\n", strerror(errno));
+ if (bind_with_warn(fd, (struct sockaddr*) &local, sizeof(local)) < 0)
goto fail;
- }
yes = 1;
if (setsockopt(fd, SOL_IPV6, IPV6_HOPLIMIT, &yes, sizeof(yes)) < 0) {
return -1;
}
-static gint sendmsg_loop(gint fd, struct msghdr *msg, gint flags) {
- g_assert(fd >= 0);
- g_assert(msg);
+static int sendmsg_loop(int fd, struct msghdr *msg, int flags) {
+ assert(fd >= 0);
+ assert(msg);
for (;;) {
return 0;
}
-gint avahi_send_dns_packet_ipv4(gint fd, gint interface, AvahiDnsPacket *p, const AvahiIPv4Address *a, guint16 port) {
+int avahi_send_dns_packet_ipv4(int fd, int interface, AvahiDnsPacket *p, const AvahiIPv4Address *a, uint16_t port) {
struct sockaddr_in sa;
struct msghdr msg;
struct iovec io;
struct in_pktinfo *pkti;
uint8_t cmsg_data[sizeof(struct cmsghdr) + sizeof(struct in_pktinfo)];
- g_assert(fd >= 0);
- g_assert(p);
- g_assert(avahi_dns_packet_check_valid(p) >= 0);
- g_assert(!a || port > 0);
+ assert(fd >= 0);
+ assert(p);
+ assert(avahi_dns_packet_is_valid(p) >= 0);
+ assert(!a || port > 0);
if (!a)
mdns_mcast_group_ipv4(&sa);
msg.msg_controllen = sizeof(cmsg_data);
msg.msg_flags = 0;
- return sendmsg_loop(fd, &msg, MSG_DONTROUTE);
+ return sendmsg_loop(fd, &msg, 0 /*MSG_DONTROUTE*/);
}
-gint avahi_send_dns_packet_ipv6(gint fd, gint interface, AvahiDnsPacket *p, const AvahiIPv6Address *a, guint16 port) {
+int avahi_send_dns_packet_ipv6(int fd, int interface, AvahiDnsPacket *p, const AvahiIPv6Address *a, uint16_t port) {
struct sockaddr_in6 sa;
struct msghdr msg;
struct iovec io;
struct in6_pktinfo *pkti;
uint8_t cmsg_data[sizeof(struct cmsghdr) + sizeof(struct in6_pktinfo)];
- g_assert(fd >= 0);
- g_assert(p);
- g_assert(avahi_dns_packet_check_valid(p) >= 0);
+ assert(fd >= 0);
+ assert(p);
+ assert(avahi_dns_packet_is_valid(p) >= 0);
if (!a)
mdns_mcast_group_ipv6(&sa);
msg.msg_controllen = sizeof(cmsg_data);
msg.msg_flags = 0;
- return sendmsg_loop(fd, &msg, MSG_DONTROUTE);
+ return sendmsg_loop(fd, &msg, 0 /*MSG_DONTROUTE*/);
}
-AvahiDnsPacket* avahi_recv_dns_packet_ipv4(gint fd, struct sockaddr_in *ret_sa, gint *ret_iface, guint8* ret_ttl) {
+AvahiDnsPacket* avahi_recv_dns_packet_ipv4(int fd, struct sockaddr_in *ret_sa, AvahiIPv4Address *ret_dest_address, int *ret_iface, uint8_t* ret_ttl) {
AvahiDnsPacket *p= NULL;
struct msghdr msg;
struct iovec io;
uint8_t aux[1024];
ssize_t l;
struct cmsghdr *cmsg;
- gboolean found_ttl = FALSE, found_iface = FALSE;
- guint ms;
+ int found_ttl = 0, found_iface = 0;
+ int ms;
- g_assert(fd >= 0);
- g_assert(ret_sa);
- g_assert(ret_iface);
- g_assert(ret_ttl);
+ assert(fd >= 0);
+ assert(ret_sa);
+ assert(ret_dest_address);
+ assert(ret_iface);
+ assert(ret_ttl);
if (ioctl(fd, FIONREAD, &ms) < 0) {
avahi_log_warn("ioctl(): %s", strerror(errno));
if (ret_sa->sin_addr.s_addr == INADDR_ANY) {
/* Linux 2.4 behaves very strangely sometimes! */
- avahi_hexdump(AVAHI_DNS_PACKET_DATA(p), l);
-
-
+ /*avahi_hexdump(AVAHI_DNS_PACKET_DATA(p), l); */
goto fail;
}
- g_assert(!(msg.msg_flags & MSG_CTRUNC));
- g_assert(!(msg.msg_flags & MSG_TRUNC));
+ assert(!(msg.msg_flags & MSG_CTRUNC));
+ assert(!(msg.msg_flags & MSG_TRUNC));
p->size = (size_t) l;
*ret_ttl = 0;
if (cmsg->cmsg_type == IP_TTL) {
*ret_ttl = (uint8_t) (*(int *) CMSG_DATA(cmsg));
- found_ttl = TRUE;
+ found_ttl = 1;
} else if (cmsg->cmsg_type == IP_PKTINFO) {
- *ret_iface = (gint) ((struct in_pktinfo*) CMSG_DATA(cmsg))->ipi_ifindex;
- found_iface = TRUE;
+ struct in_pktinfo *i = (struct in_pktinfo*) CMSG_DATA(cmsg);
+ *ret_iface = (int) i->ipi_ifindex;
+ ret_dest_address->address = i->ipi_addr.s_addr;
+ found_iface = 1;
}
}
}
/* avahi_log_debug("ttl=%u iface=%i", *ret_ttl, *ret_iface); */
- g_assert(found_iface);
- g_assert(found_ttl);
+ assert(found_iface);
+ assert(found_ttl);
return p;
return NULL;
}
-AvahiDnsPacket* avahi_recv_dns_packet_ipv6(gint fd, struct sockaddr_in6 *ret_sa, gint *ret_iface, guint8* ret_ttl) {
+AvahiDnsPacket* avahi_recv_dns_packet_ipv6(int fd, struct sockaddr_in6 *ret_sa, AvahiIPv6Address *ret_dest_address, int *ret_iface, uint8_t* ret_ttl) {
AvahiDnsPacket *p = NULL;
struct msghdr msg;
struct iovec io;
uint8_t aux[64];
ssize_t l;
- guint ms;
+ int ms;
struct cmsghdr *cmsg;
- gboolean found_ttl = FALSE, found_iface = FALSE;
+ int found_ttl = 0, found_iface = 0;
- g_assert(fd >= 0);
- g_assert(ret_sa);
- g_assert(ret_iface);
- g_assert(ret_ttl);
+ assert(fd >= 0);
+ assert(ret_sa);
+ assert(ret_dest_address);
+ assert(ret_iface);
+ assert(ret_ttl);
if (ioctl(fd, FIONREAD, &ms) < 0) {
avahi_log_warn("ioctl(): %s", strerror(errno));
for (cmsg = CMSG_FIRSTHDR(&msg); cmsg != NULL; cmsg = CMSG_NXTHDR(&msg, cmsg)) {
if (cmsg->cmsg_level == SOL_IPV6 && cmsg->cmsg_type == IPV6_HOPLIMIT) {
*ret_ttl = (uint8_t) (*(int *) CMSG_DATA(cmsg));
- found_ttl = TRUE;
+ found_ttl = 1;
}
if (cmsg->cmsg_level == SOL_IPV6 && cmsg->cmsg_type == IPV6_PKTINFO) {
- *ret_iface = ((struct in6_pktinfo*) CMSG_DATA(cmsg))->ipi6_ifindex;
- found_iface = TRUE;
+ struct in6_pktinfo *i = (struct in6_pktinfo*) CMSG_DATA(cmsg);
+ *ret_iface = i->ipi6_ifindex;
+ memcpy(ret_dest_address->address, i->ipi6_addr.s6_addr, 16);
+ found_iface = 1;
}
}
- g_assert(found_iface);
- g_assert(found_ttl);
+ assert(found_iface);
+ assert(found_ttl);
return p;
return NULL;
}
-gint avahi_open_legacy_unicast_socket_ipv4(void) {
+int avahi_open_legacy_unicast_socket_ipv4(void) {
struct sockaddr_in local;
int fd = -1, yes;
return -1;
}
-gint avahi_open_legacy_unicast_socket_ipv6(void) {
+int avahi_open_legacy_unicast_socket_ipv6(void) {
struct sockaddr_in local;
int fd = -1, yes;
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