Repository : ssh://git@open-mesh.org/alfred On branch : master commit e9e98b1d111ad44dba254a740152c4f76fa23bb5 Author: Sven Eckelmann &lt;sven(a)narfation.org&gt; Date: Tue Jul 29 14:06:54 2014 +0200 alfred: Bind alfred to a specific device It is necessary to bind the alfred process to a specific device to allow multiple instances of it to run at the same time but on different network interfaces. Just using the scope_id with IPv6 is not enough to bind only on this specific network device. Also using a specific address+port would not work because then the master announcements would not be received anymore. The bind to device only works when the user has root privileges. Therefore, alfred must now be started as root. Reported-by: Tobias Hachmer &lt;tobias(a)hachmer.de&gt; Signed-off-by: Sven Eckelmann &lt;sven(a)narfation.org&gt; Signed-off-by: Simon Wunderlich &lt;sw(a)simonwunderlich.de&gt; e9e98b1d111ad44dba254a740152c4f76fa23bb5 netsock.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/netsock.c b/netsock.c index a1a97e4..b59b7b7 100644 --- a/netsock.c +++ b/netsock.c @@ -52,7 +52,7 @@ int netsock_open(struct globals *globals) globals->netsock = -1; - sock = socket(PF_INET6, SOCK_DGRAM, 0); + sock = socket(PF_INET6, SOCK_DGRAM, IPPROTO_UDP); if (sock < 0) { perror("can't open socket"); return -1; @@ -82,6 +82,12 @@ int netsock_open(struct globals *globals) memcpy(&globals->hwaddr, &ifr.ifr_hwaddr.sa_data, 6); mac_to_ipv6(&globals->hwaddr, &globals->address); + if (setsockopt(sock, SOL_SOCKET, SO_BINDTODEVICE, + globals->interface, strlen(globals->interface) + 1)) { + perror("can't bind to device"); + goto err; + } + if (bind(sock, (struct sockaddr *)&sin6, sizeof(sin6)) < 0) { perror("can't bind"); goto err;