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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/' ```
66 lines
3 KiB
C
66 lines
3 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/errno.h"
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#include "libc/serialize.h"
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#include "libc/intrin/kprintf.h"
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#include "libc/runtime/runtime.h"
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#include "libc/sock/sock.h"
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#include "libc/sock/struct/sockaddr.h"
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#include "libc/str/str.h"
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#include "libc/sysv/consts/af.h"
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#include "libc/sysv/consts/ex.h"
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#include "libc/sysv/consts/sock.h"
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#include "net/http/http.h"
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#include "net/http/ip.h"
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int main(int argc, char *argv[]) {
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if (argc < 2) {
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kprintf("usage: blackhole IP...\n");
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return EX_USAGE;
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}
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int fd;
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struct sockaddr_un addr = {AF_UNIX, "/var/run/blackhole.sock"};
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if ((fd = socket(AF_UNIX, SOCK_DGRAM, 0)) == -1) {
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kprintf("error: socket(AF_UNIX) failed: %s\n", strerror(errno));
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return 3;
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}
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int rc = 0;
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for (int i = 1; i < argc; ++i) {
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int64_t ip;
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char buf[4];
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if ((ip = ParseIp(argv[i], -1)) != -1) {
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WRITE32BE(buf, ip);
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if (sendto(fd, buf, 4, 0, (struct sockaddr *)&addr, sizeof(addr)) == -1) {
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kprintf("error: sendto(%#s) failed: %s\n", addr.sun_path,
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strerror(errno));
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rc |= 2;
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}
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} else {
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kprintf("error: bad ipv4 address: %s\n", argv[i]);
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rc |= 1;
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}
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}
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return rc;
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}
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