mirror of
https://gitlab.freedesktop.org/NetworkManager/NetworkManager.git
synced 2026-05-04 16:28:01 +02:00
c42f6f0997
Yes, there probably are not multiple threads here. It's a matter of principle to not use smelly functions. Also, copy the "errno" value we want to print, before calling various functions.
132 lines
2.8 KiB
C
132 lines
2.8 KiB
C
/* SPDX-License-Identifier: LGPL-2.1-or-later */
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/* Copyright (C) 2021 Red Hat, Inc. */
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#include "libnm-std-aux/nm-default-std.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <arpa/inet.h>
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#include <netdb.h>
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#if defined(__GLIBC__)
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#include <nss.h>
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#endif
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#include <stdarg.h>
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enum {
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RETURN_SUCCESS = 0,
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RETURN_INVALID_CMD = 1,
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RETURN_INVALID_ARGS = 2,
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RETURN_ERROR = 3,
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};
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static char *
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read_arg(void)
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{
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nm_auto_free char *arg = NULL;
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size_t len = 0;
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if (getdelim(&arg, &len, '\0', stdin) < 0)
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return NULL;
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return nm_steal_pointer(&arg);
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}
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static int
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more_args(void)
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{
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nm_auto_free char *arg = NULL;
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arg = read_arg();
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return !!arg;
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}
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static int
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cmd_version(void)
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{
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if (more_args())
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return RETURN_INVALID_ARGS;
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printf("1");
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return RETURN_SUCCESS;
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}
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static int
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cmd_resolve_address(void)
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{
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nm_auto_free char *address = NULL;
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union {
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struct sockaddr_in in;
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struct sockaddr_in6 in6;
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} sockaddr;
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socklen_t sockaddr_size;
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char name[NI_MAXHOST];
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int ret;
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address = read_arg();
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if (!address)
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return RETURN_INVALID_ARGS;
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if (more_args())
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return RETURN_INVALID_ARGS;
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memset(&sockaddr, 0, sizeof(sockaddr));
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#if defined(__GLIBC__)
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__nss_configure_lookup("hosts", "dns");
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#endif
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if (inet_pton(AF_INET, address, &sockaddr.in.sin_addr) == 1) {
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sockaddr.in.sin_family = AF_INET;
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sockaddr_size = sizeof(struct sockaddr_in);
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} else if (inet_pton(AF_INET6, address, &sockaddr.in6.sin6_addr) == 1) {
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sockaddr.in6.sin6_family = AF_INET6;
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sockaddr_size = sizeof(struct sockaddr_in6);
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} else
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return RETURN_INVALID_ARGS;
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ret = getnameinfo((struct sockaddr *) &sockaddr,
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sockaddr_size,
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name,
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sizeof(name),
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NULL,
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0,
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NI_NAMEREQD);
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if (ret != 0) {
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if (ret == EAI_SYSTEM) {
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int errsv = errno;
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char buf[1024];
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fprintf(stderr,
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"getnameinfo() failed: %d (%s), system error: %d (%s)\n",
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ret,
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gai_strerror(ret),
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errsv,
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_nm_strerror_r(errsv, buf, sizeof(buf)));
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} else {
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fprintf(stderr, "getnameinfo() failed: %d (%s)\n", ret, gai_strerror(ret));
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}
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return RETURN_ERROR;
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}
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printf("%s", name);
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return RETURN_SUCCESS;
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}
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int
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main(int argc, char **argv)
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{
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nm_auto_free char *cmd = NULL;
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cmd = read_arg();
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if (!cmd)
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return RETURN_INVALID_CMD;
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if (nm_streq(cmd, "version"))
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return cmd_version();
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if (nm_streq(cmd, "resolve-address"))
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return cmd_resolve_address();
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return RETURN_INVALID_CMD;
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}
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