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#include <ctype.h>
#include <popt.h>
#include <stdio.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
typedef unsigned int int32;
int main(int argc, char ** argv) {
int showBroadcast = 0, showNetwork = 0, showHostname = 0, showNetmask = 0;
int beSilent = 0;
int rc;
poptContext optCon;
char * ipStr, * netmaskStr, * chptr;
int32 ip, netmask, network, broadcast;
struct hostent * hostinfo;
char errBuf[250];
struct poptOption optionsTable[] = {
{ "broadcast", '\0', 0, &showBroadcast, 0,
"Display calculated broadcast address", },
{ "hostname", '\0', 0, &showHostname, 0,
"Show hostname determined via DNS" },
{ "netmask", '\0', 0, &showNetmask, 0,
"Display default netmask for IP (class A, B, or C)" },
{ "network", '\0', 0, &showNetwork, 0,
"Display calculated network address", },
{ "silent", '\0', 0, &beSilent, 0,
"Don't ever display error messages " },
POPT_AUTOHELP
{ NULL, '\0', 0, 0, 0 },
};
optCon = poptGetContext("ipcalc", argc, argv, optionsTable,0);
poptReadDefaultConfig(optCon, 1);
if ((rc = poptGetNextOpt(optCon)) < -1) {
if (!beSilent)
fprintf(stderr, "ipcalc: bad argument %s: %s\n",
poptBadOption(optCon, POPT_BADOPTION_NOALIAS),
poptStrerror(rc));
return 1;
}
if (!(ipStr = poptGetArg(optCon))) {
if (!beSilent)
fprintf(stderr, "ipcalc: ip address expected\n");
return 1;
}
if (showBroadcast || showNetwork) {
if (!(netmaskStr = poptGetArg(optCon))) {
if (!beSilent)
fprintf(stderr, "ipcalc: netmask expected\n");
return 1;
}
if (!inet_aton(netmaskStr, (struct in_addr *) &netmask)) {
if (!beSilent)
fprintf(stderr, "ipcalc: bad netmask: %s\n", netmaskStr);
return 1;
}
}
if ((chptr = poptGetArg(optCon))) {
if (!beSilent)
fprintf(stderr, "ipcalc: unexpected argument: %s\n", chptr);
return 1;
}
poptFreeContext(optCon);
if (!inet_aton(ipStr, (struct in_addr *) &ip)) {
if (!beSilent)
fprintf(stderr, "ipcalc: bad ip address: %s\n", ipStr);
return 1;
}
if (showNetmask) {
if (((ntohl(ip) & 0xFF000000) >> 24) <= 127)
chptr = "255.0.0.0";
else if (((ntohl(ip) & 0xFF000000) >> 24) <= 191)
chptr = "255.255.0.0";
else
chptr = "255.255.255.0";
printf("NETMASK=%s\n", chptr);
}
if (showBroadcast) {
broadcast = (ip & netmask) | ~netmask;
printf("BROADCAST=%s\n", inet_ntoa(*((struct in_addr *) &broadcast)));
}
if (showNetwork) {
network = ip & netmask;
printf("NETWORK=%s\n", inet_ntoa(*((struct in_addr *) &network)));
}
if (showHostname) {
int x;
hostinfo = gethostbyaddr((char *) &ip, sizeof(ip), AF_INET);
if (!hostinfo) {
if (!beSilent) {
sprintf(errBuf, "ipcalc: cannot find hostname for %s", ipStr);
herror(errBuf);
}
return 1;
}
for (x=0; hostinfo->h_name[x]; x++) {
hostinfo->h_name[x] = tolower(hostinfo->h_name[x]);
}
printf("HOSTNAME=%s\n", hostinfo->h_name);
}
return 0;
}
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