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add a gotd session process, split off from the parent process The new session process is able to manipulate files in the repository and keeps track of the read/write client session state. The parent process now restricts its view of the filesystem to the absolute path stored in argv[0], and combines this with unveil "x" on this path. As a result the parent process can only re-exec itself. small tweaks + ok op@
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 1 62ee7d94 2023-01-10 thomas /*

 2 62ee7d94 2023-01-10 thomas  * Copyright (c) 2022, 2023 Stefan Sperling <stsp@openbsd.org>

 3 62ee7d94 2023-01-10 thomas  *

 4 62ee7d94 2023-01-10 thomas  * Permission to use, copy, modify, and distribute this software for any

 5 62ee7d94 2023-01-10 thomas  * purpose with or without fee is hereby granted, provided that the above

 6 62ee7d94 2023-01-10 thomas  * copyright notice and this permission notice appear in all copies.

 7 62ee7d94 2023-01-10 thomas  *

 8 62ee7d94 2023-01-10 thomas  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES

 9 62ee7d94 2023-01-10 thomas  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF

10 62ee7d94 2023-01-10 thomas  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR

11 62ee7d94 2023-01-10 thomas  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES

12 62ee7d94 2023-01-10 thomas  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN

13 62ee7d94 2023-01-10 thomas  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF

14 62ee7d94 2023-01-10 thomas  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

15 62ee7d94 2023-01-10 thomas  */

16 62ee7d94 2023-01-10 thomas 

17 62ee7d94 2023-01-10 thomas void session_main(const char *, const char *, int *, int *, struct timeval *);