144 lines
3.1 KiB
C
144 lines
3.1 KiB
C
/* vi: set sw=4 ts=4 ai: */
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/*
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* Mini ipcalc implementation for busybox
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*
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* By Jordan Crouse <jordan@cosmicpenguin.net>
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* Stephan Linz <linz@li-pro.net>
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*
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* This is a complete reimplentation of the ipcalc program
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* from Redhat. I didn't look at their source code, but there
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* is no denying that this is a loving reimplementation
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <ctype.h>
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#include <getopt.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include "busybox.h"
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#define IPCALC_MSG(CMD,ALTCMD) if (mode & SILENT) {ALTCMD;} else {CMD;}
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static unsigned long get_netmask(unsigned long ipaddr)
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{
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if (ipaddr & 0xC0) {
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return 0x00FFFFFF; /* Class C */
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}
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if (ipaddr & 0x10) {
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return 0x0000FFFF; /* Class B */
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}
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return 0x000000FF; /* Class A */
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}
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#define NETMASK 0x01
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#define BROADCAST 0x02
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#define NETWORK 0x04
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#define HOSTNAME 0x08
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#define SILENT 0x10
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int ipcalc_main(int argc, char **argv)
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{
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unsigned long mode;
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unsigned long netmask = 0;
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unsigned long broadcast;
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unsigned long network;
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unsigned long ipaddr;
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static const struct option long_options[] = {
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{"netmask", no_argument, NULL, 'n'},
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{"broadcast", no_argument, NULL, 'b'},
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{"network", no_argument, NULL, 'w'},
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#ifdef CONFIG_FEATURE_IPCALC_FANCY
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{"hostname", no_argument, NULL, 'h'},
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{"silent", no_argument, NULL, 's'},
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#endif
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{NULL, 0, NULL, 0}
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};
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bb_applet_long_options = long_options;
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mode = bb_getopt_ulflags(argc, argv,
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#ifdef CONFIG_FEATURE_IPCALC_FANCY
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"nbwhs");
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#else
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"nbw");
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#endif
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if (mode & (BROADCAST | NETWORK)) {
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if (argc - optind > 2) {
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bb_show_usage();
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}
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} else {
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if (argc - optind != 1) {
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bb_show_usage();
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}
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}
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ipaddr = inet_addr(argv[optind]);
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if (ipaddr == INADDR_NONE) {
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IPCALC_MSG(bb_error_msg_and_die("bad IP address: %s", argv[optind]),
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exit(EXIT_FAILURE));
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}
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if (argc - optind == 2) {
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netmask = inet_addr(argv[optind + 1]);
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}
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if (ipaddr == INADDR_NONE) {
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IPCALC_MSG(bb_error_msg_and_die("bad netmask: %s", argv[optind + 1]),
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exit(EXIT_FAILURE));
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}
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/* JHC - If the netmask wasn't provided then calculate it */
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if (!netmask) {
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netmask = get_netmask(ipaddr);
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}
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if (mode & NETMASK) {
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printf("NETMASK=%s\n", inet_ntoa((*(struct in_addr *) &netmask)));
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}
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if (mode & BROADCAST) {
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broadcast = (ipaddr & netmask) | ~netmask;
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printf("BROADCAST=%s\n", inet_ntoa((*(struct in_addr *) &broadcast)));
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}
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if (mode & NETWORK) {
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network = ipaddr & netmask;
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printf("NETWORK=%s\n", inet_ntoa((*(struct in_addr *) &network)));
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}
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#ifdef CONFIG_FEATURE_IPCALC_FANCY
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if (mode & HOSTNAME) {
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struct hostent *hostinfo;
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int x;
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hostinfo = gethostbyaddr((char *) &ipaddr, sizeof(ipaddr), AF_INET);
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if (!hostinfo) {
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IPCALC_MSG(bb_herror_msg_and_die(
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"cannot find hostname for %s", argv[optind]),);
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exit(EXIT_FAILURE);
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}
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for (x = 0; hostinfo->h_name[x]; x++) {
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hostinfo->h_name[x] = tolower(hostinfo->h_name[x]);
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}
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printf("HOSTNAME=%s\n", hostinfo->h_name);
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}
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#endif
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return EXIT_SUCCESS;
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}
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/* END CODE */
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/*
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Local Variables:
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c-file-style: "linux"
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c-basic-offset: 4
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tab-width: 4
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End:
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*/
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