Jason A. Donenfeld
23bf3cfccb
Rather than hoping that the AF_SYSTEM fd is of type utun, and then calling "2" on it to get the name -- which could be defined as something else for a different AF_SYSTEM socket type -- instead simply query the AF_SYSTEM control socket ID with getpeername. This has one catch, which is that the ID is dynamically allocated, so we resolve it using the qualified name. Normally we'd make a new AF_SYSTEM socket for this, but since that's not allowed in the sandbox, we reuse the AF_SYSTEM socket that we're checking. At this point in the flow, we know that it's a proper AF_SYSTEM one, based on the first sockaddr member; we just don't know that it's a utun variety. Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
21 lines
457 B
C
21 lines
457 B
C
// SPDX-License-Identifier: MIT
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// Copyright © 2018-2020 WireGuard LLC. All Rights Reserved.
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#include "key.h"
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#include "x25519.h"
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/* From <sys/kern_control.h> */
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#define CTLIOCGINFO 0xc0644e03UL
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struct ctl_info {
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u_int32_t ctl_id;
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char ctl_name[96];
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};
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struct sockaddr_ctl {
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u_char sc_len;
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u_char sc_family;
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u_int16_t ss_sysaddr;
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u_int32_t sc_id;
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u_int32_t sc_unit;
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u_int32_t sc_reserved[5];
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};
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