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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/' ```
117 lines
4.4 KiB
C
117 lines
4.4 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 2023 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/fmt/itoa.h"
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#include "libc/runtime/runtime.h"
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#include "libc/sock/ifaddrs.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/sock/struct/sockaddr6.h"
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#include "libc/stdio/stdio.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/iff.h"
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/* example output:
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eth0
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addr: 10.10.10.237
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netmask: 255.255.255.0
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broadcast: 255.255.255.0
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flags: IFF_UP IFF_BROADCAST IFF_MULTICAST IFF_RUNNING
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lo
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addr: 127.0.0.1
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netmask: 255.0.0.0
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flags: IFF_UP IFF_LOOPBACK IFF_RUNNING */
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const char *sockaddr2str(const struct sockaddr *sa, char *buf, size_t size) {
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if (sa->sa_family == AF_INET) {
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return inet_ntop(AF_INET, &(((const struct sockaddr_in *)sa)->sin_addr),
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buf, size);
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} else if (sa->sa_family == AF_INET6) {
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return inet_ntop(AF_INET6, &(((const struct sockaddr_in6 *)sa)->sin6_addr),
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buf, size);
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} else {
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return 0;
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}
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}
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int main(int argc, char *argv[]) {
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// get network interface list
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struct ifaddrs *ifaddrs;
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if (getifaddrs(&ifaddrs)) {
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perror("getifaddrs");
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exit(1);
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}
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// print network interface list
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for (struct ifaddrs *ifa = ifaddrs; ifa; ifa = ifa->ifa_next) {
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tinyprint(1, ifa->ifa_name, "\n", NULL);
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char buf[128];
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if (sockaddr2str(ifa->ifa_addr, buf, sizeof(buf))) {
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tinyprint(1, "addr: ", buf, "\n", NULL);
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}
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if (sockaddr2str(ifa->ifa_netmask, buf, sizeof(buf))) {
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tinyprint(1, "netmask: ", buf, "\n", NULL);
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}
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if ((ifa->ifa_flags & IFF_BROADCAST) &&
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sockaddr2str(ifa->ifa_netmask, buf, sizeof(buf))) {
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tinyprint(1, "broadcast: ", buf, "\n", NULL);
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} else if ((ifa->ifa_flags & IFF_POINTOPOINT) &&
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sockaddr2str(ifa->ifa_dstaddr, buf, sizeof(buf))) {
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tinyprint(1, "dstaddr: ", buf, "\n", NULL);
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}
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tinyprint(1, "flags:", NULL);
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if (ifa->ifa_flags & IFF_UP) {
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tinyprint(1, " IFF_UP", NULL);
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}
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if (ifa->ifa_flags & IFF_DEBUG) {
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tinyprint(1, " IFF_DEBUG", NULL);
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}
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if (ifa->ifa_flags & IFF_LOOPBACK) {
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tinyprint(1, " IFF_LOOPBACK", NULL);
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}
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if (ifa->ifa_flags & IFF_MULTICAST) {
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tinyprint(1, " IFF_MULTICAST", NULL);
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}
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if (ifa->ifa_flags & IFF_ALLMULTI) {
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tinyprint(1, " IFF_ALLMULTI", NULL);
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}
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if (ifa->ifa_flags & IFF_NOARP) {
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tinyprint(1, " IFF_NOARP", NULL);
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}
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if (ifa->ifa_flags & IFF_PROMISC) {
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tinyprint(1, " IFF_PROMISC", NULL);
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}
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tinyprint(1, "\n", NULL);
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tinyprint(1, "\n", NULL);
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}
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// perform cleanup
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freeifaddrs(ifaddrs);
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// report success
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exit(0);
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}
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