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How cam I bind a socket to an interface to send data through it
Hello, In a simple macOS tool, I'm trying to bind a socket to the default interface like "en0" or a VPN interface like "utun5" to make the socket send the data only through that interface. int idx = (int)if_nametoindex("utun5"); if (setsockopt(sock, IPPROTO_IP, IP_BOUND_IF, &idx, sizeof(idx)) == -1) { perror("setsockopt"); exit(1); } The method setsockopt succeeds however the data doesn't go through the bound interface, but it goes through the default interface like if there has been no binding at all. I tried also with libcurl, which is based on sockets, but the data goes through the default interface like before, even if the method succeed. if (curl_easy_setopt(curlH, CURLOPT_INTERFACE, "utun5") != CURLE_OK) { perror("CURLOPT_INTERFACE"); exit(1); } May someone suggest how to bind an interface to a socket in a way that makes all the data transmitted by that socket go only through the bound interface? Any constructive suggestion is very welcome. Thank you! Best regards, Luca Severini
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Aug ’23
Info on /System/Volumes/Data/home
Hello everybody, Does someone knowledgeable know why on macOS (11.6.2 Big Sur at list in my case), there is that mounted volume /System/Volumes/Data/home that is usually empty (at least for me) and appears to be a kinda of network volume that (of course for a network volume) doesn't support the fast searchfs functionality ? What's its use? For some context, here is the list of mounted volumes on my MacBook Pro with two volumes visible on the Desktop, Macintosh HD (/ + /System/Volumes/Data) and Data (/Volumes/Data) : /dev/disk1s1s1 (apfs): / devfs (devfs): /dev (doesn't support searchfs) /dev/disk1s5 (apfs): /System/Volumes/VM /dev/disk1s3 (apfs): /System/Volumes/Preboot /dev/disk1s6 (apfs): /System/Volumes/Update /dev/disk1s2 (apfs): /System/Volumes/Data /dev/disk1s7 (apfs): /Volumes/Data map auto_home (autofs): /System/Volumes/Data/home (doesn't support searchfs) Thank you! Best regards, Luca Severini
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Mar ’22