X-Git-Url: http://git.meshlink.io/?a=blobdiff_plain;f=avahi-core%2Fsocket.c;h=61b5eb4c868021e920be7c8b7039a5e0274fcb75;hb=1f42fa6815e3de2ca7cd136c7709584c977b3640;hp=9291f0845ef4de8408cfa486f93a4826dd320fcf;hpb=e2847ebc0efccbc368af59d53863b7c54c1970da;p=catta

diff --git a/avahi-core/socket.c b/avahi-core/socket.c
index 9291f08..61b5eb4 100644
--- a/avahi-core/socket.c
+++ b/avahi-core/socket.c
@@ -475,10 +475,10 @@ int avahi_send_dns_packet_ipv4(
     struct iovec io;
 #ifdef IP_PKTINFO
     struct cmsghdr *cmsg;
-    uint8_t cmsg_data[CMSG_SPACE(sizeof(struct in_pktinfo))];
+    size_t cmsg_data[( CMSG_SPACE(sizeof(struct in_pktinfo)) / sizeof(size_t)) + 1];
 #elif defined(IP_SENDSRCADDR)
     struct cmsghdr *cmsg;
-    uint8_t cmsg_data[CMSG_SPACE(sizeof(struct in_addr))];
+    size_t cmsg_data[( CMSG_SPACE(sizeof(struct in_addr)) / sizeof(size_t)) + 1];
 #endif
 
     assert(fd >= 0);
@@ -560,12 +560,19 @@ int avahi_send_dns_packet_ipv4(
     return sendmsg_loop(fd, &msg, 0);
 }
 
-int avahi_send_dns_packet_ipv6(int fd, AvahiIfIndex interface, AvahiDnsPacket *p, const AvahiIPv6Address *src_address, const AvahiIPv6Address *dst_address, uint16_t dst_port) {
+int avahi_send_dns_packet_ipv6(
+        int fd,
+        AvahiIfIndex interface,
+        AvahiDnsPacket *p,
+        const AvahiIPv6Address *src_address,
+        const AvahiIPv6Address *dst_address,
+        uint16_t dst_port) {
+    
     struct sockaddr_in6 sa;
     struct msghdr msg;
     struct iovec io;
     struct cmsghdr *cmsg;
-    uint8_t cmsg_data[CMSG_SPACE(sizeof(struct in6_pktinfo))];
+    size_t cmsg_data[(CMSG_SPACE(sizeof(struct in6_pktinfo))/sizeof(size_t)) + 1];
 
     assert(fd >= 0);
     assert(p);
@@ -617,7 +624,14 @@ int avahi_send_dns_packet_ipv6(int fd, AvahiIfIndex interface, AvahiDnsPacket *p
     return sendmsg_loop(fd, &msg, 0);
 }
 
-AvahiDnsPacket *avahi_recv_dns_packet_ipv4(int fd, AvahiIPv4Address *ret_src_address, uint16_t *ret_src_port, AvahiIPv4Address *ret_dst_address, AvahiIfIndex *ret_iface, uint8_t *ret_ttl) {
+AvahiDnsPacket *avahi_recv_dns_packet_ipv4(
+        int fd,
+        AvahiIPv4Address *ret_src_address,
+        uint16_t *ret_src_port,
+        AvahiIPv4Address *ret_dst_address,
+        AvahiIfIndex *ret_iface,
+        uint8_t *ret_ttl) {
+    
     AvahiDnsPacket *p= NULL;
     struct msghdr msg;
     struct iovec io;
@@ -635,6 +649,11 @@ AvahiDnsPacket *avahi_recv_dns_packet_ipv4(int fd, AvahiIPv4Address *ret_src_add
         goto fail;
     }
 
+    if (ms < 0) {
+        avahi_log_warn("FIONREAD returned negative value.");
+        goto fail;
+    }
+
     p = avahi_dns_packet_new(ms + AVAHI_DNS_PACKET_EXTRA_SIZE);
 
     io.iov_base = AVAHI_DNS_PACKET_DATA(p);
@@ -650,7 +669,14 @@ AvahiDnsPacket *avahi_recv_dns_packet_ipv4(int fd, AvahiIPv4Address *ret_src_add
     msg.msg_flags = 0;
     
     if ((l = recvmsg(fd, &msg, 0)) < 0) {
-        avahi_log_warn("recvmsg(): %s", strerror(errno));
+        /* Linux returns EAGAIN when an invalid IP packet has been
+        recieved. We suppress warnings in this case because this might
+        create quite a bit of log traffic on machines with unstable
+        links. (See #60) */
+
+        if (errno != EAGAIN)
+            avahi_log_warn("recvmsg(): %s", strerror(errno));
+
         goto fail;
     }
 
@@ -751,7 +777,14 @@ fail:
     return NULL;
 }
 
-AvahiDnsPacket *avahi_recv_dns_packet_ipv6(int fd, AvahiIPv6Address *ret_src_address, uint16_t *ret_src_port, AvahiIPv6Address *ret_dst_address, AvahiIfIndex *ret_iface, uint8_t *ret_ttl) {
+AvahiDnsPacket *avahi_recv_dns_packet_ipv6(
+        int fd,
+        AvahiIPv6Address *ret_src_address,
+        uint16_t *ret_src_port,
+        AvahiIPv6Address *ret_dst_address,
+        AvahiIfIndex *ret_iface,
+        uint8_t *ret_ttl) {
+    
     AvahiDnsPacket *p = NULL;
     struct msghdr msg;
     struct iovec io;
@@ -768,6 +801,11 @@ AvahiDnsPacket *avahi_recv_dns_packet_ipv6(int fd, AvahiIPv6Address *ret_src_add
         avahi_log_warn("ioctl(): %s", strerror(errno));
         goto fail;
     }
+
+    if (ms < 0) {
+        avahi_log_warn("FIONREAD returned negative value.");
+        goto fail;
+    }
     
     p = avahi_dns_packet_new(ms + AVAHI_DNS_PACKET_EXTRA_SIZE);
 
@@ -785,7 +823,14 @@ AvahiDnsPacket *avahi_recv_dns_packet_ipv6(int fd, AvahiIPv6Address *ret_src_add
     msg.msg_flags = 0;
     
     if ((l = recvmsg(fd, &msg, 0)) < 0) {
-        avahi_log_warn("recvmsg(): %s", strerror(errno));
+        /* Linux returns EAGAIN when an invalid IP packet has been
+        recieved. We suppress warnings in this case because this might
+        create quite a bit of log traffic on machines with unstable
+        links. (See #60) */
+
+        if (errno != EAGAIN)
+            avahi_log_warn("recvmsg(): %s", strerror(errno));
+        
         goto fail;
     }
 
@@ -840,7 +885,7 @@ AvahiDnsPacket *avahi_recv_dns_packet_ipv6(int fd, AvahiIPv6Address *ret_src_add
 
     assert(found_iface);
     assert(found_ttl);
-
+    
     return p;
 
 fail:
@@ -892,13 +937,19 @@ fail:
 
 int avahi_open_unicast_socket_ipv6(void) {
     struct sockaddr_in6 local;
-    int fd = -1;
+    int fd = -1, yes;
         
     if ((fd = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
         avahi_log_warn("socket() failed: %s", strerror(errno));
         goto fail;
     }
     
+    yes = 1;
+    if (setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, &yes, sizeof(yes)) < 0) {
+        avahi_log_warn("IPV6_V6ONLY failed: %s", strerror(errno));
+        goto fail;
+    }
+
     memset(&local, 0, sizeof(local));
     local.sin6_family = AF_INET6;