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https://github.com/jart/cosmopolitan.git
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e16a7d8f3b
`et` means `expandtab`. ```sh rg 'vi: .* :vi' -l -0 | \ xargs -0 sed -i '' 's/vi: \(.*\) et\(.*\) :vi/vi: \1 xoet\2:vi/' rg 'vi: .* :vi' -l -0 | \ xargs -0 sed -i '' 's/vi: \(.*\)noet\(.*\):vi/vi: \1et\2 :vi/' rg 'vi: .* :vi' -l -0 | \ xargs -0 sed -i '' 's/vi: \(.*\)xoet\(.*\):vi/vi: \1noet\2:vi/' ```
114 lines
4.1 KiB
C
114 lines
4.1 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│ vi: set et ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi │
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2022 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/calls/calls.h"
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#include "libc/calls/syscall-sysv.internal.h"
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#include "libc/dce.h"
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#include "libc/limits.h"
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#include "libc/log/bsd.h"
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#include "libc/mem/mem.h"
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#include "libc/runtime/runtime.h"
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#include "libc/stdio/stdio.h"
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#include "libc/str/str.h"
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#include "third_party/getopt/getopt.internal.h"
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#define USAGE \
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"\
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usage: unveil.com [-h] PROG ARGS...\n\
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-h show help\n\
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\n\
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unveil.com v1.o\n\
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copyright 2022 justine alexandra roberts tunney\n\
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https://twitter.com/justinetunney\n\
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https://linkedin.com/in/jtunney\n\
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https://justine.lol/pledge/\n\
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https://github.com/jart\n\
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\n\
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this program lets you launch linux commands in a filesystem sandbox\n\
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inspired by the design of openbsd's unveil() system call.\n\
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"
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wontreturn void usage(void) {
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write(2, USAGE, sizeof(USAGE) - 1);
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exit(1);
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}
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int main(int argc, char *argv[]) {
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const char *prog;
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char pathbuf[PATH_MAX];
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char *line = NULL;
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size_t size = 0;
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size_t count = 0;
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ssize_t len;
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int opt;
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const char *fields[2];
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if (!(IsLinux() || IsOpenbsd()))
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errx(1, "this program is only intended for Linux and OpenBSD");
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while ((opt = getopt(argc, argv, "h")) != -1) {
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switch (opt) {
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case 'h':
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case '?':
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default:
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usage();
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}
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}
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if (optind == argc) {
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warnx("No command provided");
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usage();
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}
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if (!(prog = commandv(argv[optind], pathbuf, sizeof(pathbuf))))
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err(1, "command not found: %s", argv[optind]);
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while ((len = getline(&line, &size, stdin)) != -1) {
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count++;
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bool chomped = false;
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while (!chomped)
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if (line[len - 1] == '\r' || line[len - 1] == '\n')
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line[--len] = '\0';
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else
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chomped = true;
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char *tok = line;
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const char *p;
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size_t i = 0;
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while ((p = strsep(&tok, " \t")) != NULL) {
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if (*p == '\0') {
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p++;
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continue;
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}
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if (i > 1) errx(1, "<stdin>:%zu - too many fields", count);
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fields[i++] = p;
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}
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if (i != 2) errx(1, "<stdin>:%zu - malformed line", count);
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if (unveil(fields[0], fields[1]) == -1)
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err(1, "unveil(%s, %s)", fields[0], fields[1]);
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}
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free(line);
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if (ferror(stdin)) {
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err(1, "getline");
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}
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if (unveil(NULL, NULL) == -1) err(1, "unveil(NULL, NULL)");
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__sys_execve(prog, argv + optind, environ);
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err(127, "execve");
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}
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