mirror of
https://github.com/jart/cosmopolitan.git
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a6baba1b07
The WIN32 CreateProcess() function does not require an .exe or .com suffix in order to spawn an executable. Now that we have Cosmo bash we're no longer so dependent on the cmd.exe prompt.
111 lines
3.9 KiB
C
111 lines
3.9 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 [-h] PROG ARGS...\n\
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-h show help\n\
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\n\
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unveil v1.o\n\
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copyright 2022 justine alexandra roberts tunney\n\
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licensed isc\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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