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adds the ability to use and calculate network prefix specifications instead

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of netmasks. It also fixes the parameters for network and netmask to match
that of the official Red Hat version (-n for network and -m for netmask).
Patch by Joshua Jackson
This commit is contained in:
Glenn L McGrath 2003-09-02 06:59:57 +00:00
parent dc4e75ef7c
commit 530ea42abc
2 changed files with 82 additions and 13 deletions
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91
networking/ipcalc.c
View file

@ -40,11 +40,29 @@ static unsigned long get_netmask(unsigned long ipaddr)
return 0;
}
#ifdef CONFIG_FEATURE_IPCALC_FANCY
static int get_prefix(unsigned long netmask)
{
unsigned long t;
int ret = 0;
for (t = 0; t < 32; t++) {
if (htonl(netmask) & (0x80000000 >> t)) {
ret ++;
} else {
break;
}
}
return ret;
}
#endif
#define NETMASK 0x01
#define BROADCAST 0x02
#define NETWORK 0x04
#define HOSTNAME 0x08
#define SILENT 0x10
#define NETPREFIX 0x08
#define HOSTNAME 0x10
#define SILENT 0x80
int ipcalc_main(int argc, char **argv)
{
@ -55,11 +73,18 @@ int ipcalc_main(int argc, char **argv)
unsigned long network;
unsigned long ipaddr;
static const struct option long_options[] = {
{"netmask", no_argument, NULL, 'n'},
{"broadcast", no_argument, NULL, 'b'},
{"network", no_argument, NULL, 'w'},
#ifdef CONFIG_FEATURE_IPCALC_FANCY
unsigned long netprefix = 0;
int have_netmask = 0;
char *ipstr, *prefixstr;
#endif
static const struct option long_options[] = {
{"netmask", no_argument, NULL, 'm'},
{"broadcast", no_argument, NULL, 'b'},
{"network", no_argument, NULL, 'n'},
#ifdef CONFIG_FEATURE_IPCALC_FANCY
{"prefix", no_argument, NULL, 'p'},
{"hostname", no_argument, NULL, 'h'},
{"silent", no_argument, NULL, 's'},
#endif
@ -69,11 +94,11 @@ int ipcalc_main(int argc, char **argv)
bb_applet_long_options = long_options;
mode = bb_getopt_ulflags(argc, argv,
#ifdef CONFIG_FEATURE_IPCALC_FANCY
"nbwhs");
"mbnphs");
#else
"nbw");
"mbn");
#endif
if (mode & (BROADCAST | NETWORK)) {
if (mode & (BROADCAST | NETWORK | NETPREFIX)) {
if (argc - optind > 2) {
bb_show_usage();
}
@ -83,16 +108,55 @@ int ipcalc_main(int argc, char **argv)
}
}
#ifdef CONFIG_FEATURE_IPCALC_FANCY
prefixstr = ipstr = argv[optind];
while(*prefixstr) {
if (*prefixstr == '/') {
*prefixstr = (char)0;
prefixstr++;
if (*prefixstr) {
netprefix = atol(prefixstr);
if (netprefix > 32) {
IPCALC_MSG(bb_error_msg_and_die("bad IP prefix: %s\n", prefixstr),
exit(EXIT_FAILURE));
}
if (netprefix) {
netmask = 0x80000000;
netprefix--;
while(netprefix) {
netmask = 0x80000000 | (netmask >> 1);
netprefix--;
}
netmask = htonl(netmask);
}
/* Even if it was 0, we will signify that we have a netmask. This allows */
/* for specification of default routes, etc which have a 0 netmask/prefix */
have_netmask = 1;
}
break;
}
prefixstr++;
}
ipaddr = inet_addr(ipstr);
#else
ipaddr = inet_addr(argv[optind]);
#endif
if (ipaddr == INADDR_NONE) {
IPCALC_MSG(bb_error_msg_and_die("bad IP address: %s", argv[optind]),
exit(EXIT_FAILURE));
}
if (argc - optind == 2) {
netmask = inet_addr(argv[optind + 1]);
#ifdef CONFIG_FEATURE_IPCALC_FANCY
if (have_netmask == 1) {
IPCALC_MSG(bb_error_msg_and_die("Both prefix and netmask were specified, use one or the other.\n"),
exit(EXIT_FAILURE));
}
have_netmask = 1;
#endif
netmask = inet_addr(argv[optind + 1]);
}
if (ipaddr == INADDR_NONE) {
@ -118,7 +182,12 @@ int ipcalc_main(int argc, char **argv)
network = ipaddr & netmask;
printf("NETWORK=%s\n", inet_ntoa((*(struct in_addr *) &network)));
}
#ifdef CONFIG_FEATURE_IPCALC_FANCY
if (mode & NETPREFIX) {
printf("PREFIX=%i\n", get_prefix(netmask));
}
if (mode & HOSTNAME) {
struct hostent *hostinfo;
int x;