268 lines
7.5 KiB
C
268 lines
7.5 KiB
C
/****************************************************************************
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* apps/system/netdb/netdb.c
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*
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* Copyright (C) 2015 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <nuttx/compiler.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <netdb.h>
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#include <arpa/inet.h>
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#include <netinet/in.h>
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#ifdef CONFIG_SYSTEM_NETDB
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* Configuration ************************************************************/
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#ifndef CONFIG_SYSTEM_NETDB_STACKSIZE
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# define CONFIG_SYSTEM_NETDB_STACKSIZE 2048
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#endif
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#ifndef CONFIG_SYSTEM_NETDB_PRIORITY
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# define CONFIG_SYSTEM_NETDB_PRIORITY 50
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#endif
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/* REVIST: Currently the availability of gethostbyaddr() depends on
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* CONFIG_NETDB_HOSTFILE. That might not always be true, however.
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*/
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#undef HAVE_GETHOSTBYADDR
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#ifdef CONFIG_NETDB_HOSTFILE
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# define HAVE_GETHOSTBYADDR 1
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#endif
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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static void show_usage(FAR const char *progname, int exitcode) noreturn_function;
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static void show_usage(FAR const char *progname, int exitcode)
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{
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fprintf(stderr, "USAGE: %s --ipv4 <ipv4-addr>\n", progname);
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#ifdef HAVE_GETHOSTBYADDR
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fprintf(stderr, " %s --ipv6 <ipv6-addr>\n", progname);
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fprintf(stderr, " %s --host <host-name>\n", progname);
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#endif
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fprintf(stderr, " %s --help\n", progname);
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exit(exitcode);
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}
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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int main(int argc, FAR char *argv[])
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{
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FAR struct hostent *host;
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FAR const char *addrtype;
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char buffer[48];
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int ret;
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/* Handle: netdb --help */
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if (argc == 2 && strcmp(argv[1], "--help") == 0)
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{
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show_usage(argv[0], EXIT_SUCCESS);
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}
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/* Otherwise there must be exactly two arguments following the program name */
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else if (argc < 3)
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{
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fprintf(stderr, "ERROR -- Missing arguments\n\n");
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show_usage(argv[0], EXIT_FAILURE);
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}
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else if (argc > 3)
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{
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fprintf(stderr, "ERROR -- Too many arguments\n\n");
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show_usage(argv[0], EXIT_FAILURE);
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}
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#ifdef HAVE_GETHOSTBYADDR
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/* Handle: netdb --ipv4 <ipv4-addr> */
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else if (strcmp(argv[1], "--ipv4") == 0)
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{
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struct in_addr addr;
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/* Convert the address to binary */
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ret = inet_pton(AF_INET, argv[2], &addr);
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if (ret < 0)
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{
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fprintf(stderr, "ERROR -- Bad IPv4 address\n\n");
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show_usage(argv[0], EXIT_FAILURE);
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}
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/* Get the matching host name + any aliases */
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host = gethostbyaddr(&addr, sizeof(struct in_addr), AF_INET);
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if (!host)
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{
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fprintf(stderr, "ERROR -- gethostbyaddr failed. h_errno=%d\n\n",
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h_errno);
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return EXIT_FAILURE;
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}
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}
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/* Handle: netdb --ipv46<ipv6-addr> */
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else if (strcmp(argv[1], "--ipv6") == 0)
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{
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struct in_addr addr;
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/* Convert the address to binary */
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ret = inet_pton(AF_INET6, argv[2], &addr);
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if (ret < 0)
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{
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fprintf(stderr, "ERROR -- Bad IPv6 address\n\n");
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show_usage(argv[0], EXIT_FAILURE);
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}
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/* Get the matching host name + any aliases */
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host = gethostbyaddr(&addr, sizeof(struct in6_addr), AF_INET6);
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if (!host)
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{
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fprintf(stderr, "ERROR -- gethostbyaddr failed. h_errno=%d\n\n",
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h_errno);
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return EXIT_FAILURE;
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}
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}
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#endif /* HAVE_GETHOSTBYADDR */
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/* Handle: netdb --host <host-name> */
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else if (strcmp(argv[1], "--host") == 0)
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{
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/* Get the matching address + any aliases */
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host = gethostbyname(argv[2]);
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if (!host)
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{
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fprintf(stderr, "ERROR -- gethostbyname failed. h_errno=%d\n\n",
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h_errno);
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return EXIT_FAILURE;
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}
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}
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/* The first argument is not any argument that we recognize */
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else
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{
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fprintf(stderr, "ERROR -- Unrecognized option: %s\n\n", argv[1]);
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show_usage(argv[0], EXIT_FAILURE);
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}
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/* If we get here, then gethostbyname() or gethostbyaddr() was
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* successfully.
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*/
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/* Convert the address to a string */
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/* Handle IPv4 addresses */
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if (host->h_addrtype == AF_INET)
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{
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if (inet_ntop(AF_INET, host->h_addr, buffer, 48) == NULL)
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{
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fprintf(stderr,
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"ERROR -- gethostbyname failed. h_errno=%d\n\n",
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h_errno);
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return EXIT_FAILURE;
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}
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addrtype = "IPv4";
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}
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/* Handle IPv6 addresses */
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else if (host->h_addrtype == AF_INET6)
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{
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if (inet_ntop(AF_INET6, host->h_addr, buffer, 48) == NULL)
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{
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fprintf(stderr,
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"ERROR -- gethostbyname failed. h_errno=%d\n\n",
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h_errno);
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return EXIT_FAILURE;
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}
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addrtype = "IPv6";
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}
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/* Huh? */
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else
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{
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fprintf(stderr, "ERROR -- gethostbyname address type %d not recognized.\n\n",
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host->h_addrtype);
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return EXIT_FAILURE;
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}
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/* Print the host name / address mapping */
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printf("Host: %s %s Addr: %s\n", host->h_name, addrtype, buffer);
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/* Print any host name aliases */
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if (host->h_aliases != NULL && *host->h_aliases != NULL)
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{
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FAR char **alias;
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printf("Aliases:");
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for (alias = host->h_aliases; *alias != NULL; alias++)
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{
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printf(" %s", *alias);
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}
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putchar('\n');
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}
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return EXIT_SUCCESS;
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}
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#endif /* CONFIG_SYSTEM_NETDB */
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