diff options
author | Lennart Poettering <lennart@poettering.net> | 2005-06-19 13:44:50 +0000 |
---|---|---|
committer | Lennart Poettering <lennart@poettering.net> | 2005-06-19 13:44:50 +0000 |
commit | ad7b145ebe82c3a53632eaa6ec75b014d91a7bea (patch) | |
tree | f885f5732b6e6e1560c60b534ed5e5014c229e2a /avahi-core/socket.c | |
parent | 64ab9be453f31b55e35ad5cad8102a9e45244a8c (diff) |
* detect other running mDNS stacks
* replace more g_message()/g_warning() calls with avahi_log_xxx()
* fix configuration file paths
* only load configuration file when running daemon
* require uid == 0
* fix static service reloading
* add new command line option for reloading -r
git-svn-id: file:///home/lennart/svn/public/avahi/trunk@129 941a03a8-eaeb-0310-b9a0-b1bbd8fe43fe
Diffstat (limited to 'avahi-core/socket.c')
-rw-r--r-- | avahi-core/socket.c | 67 |
1 files changed, 47 insertions, 20 deletions
diff --git a/avahi-core/socket.c b/avahi-core/socket.c index 55db704..8f3d896 100644 --- a/avahi-core/socket.c +++ b/avahi-core/socket.c @@ -156,6 +156,50 @@ int avahi_mdns_mcast_leave_ipv6 (int index, int fd) { return 0; } +static gint bind_with_warn(int fd, const struct sockaddr *sa, socklen_t l) { + gint yes; + + g_assert(fd >= 0); + g_assert(sa); + g_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; +} + gint avahi_open_socket_ipv4(void) { struct sockaddr_in local; int fd = -1, ttl, yes; @@ -178,26 +222,17 @@ gint avahi_open_socket_ipv4(void) { } 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) { @@ -254,12 +289,6 @@ gint avahi_open_socket_ipv6(void) { } 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)); goto fail; @@ -275,10 +304,8 @@ gint avahi_open_socket_ipv6(void) { 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) { |