added ipcalc

1 files changed, 69 insertions, 0 deletions

diff --git a/src/ipcalc.c b/src/ipcalc.c
new file mode 100644
index 00000000..5640d8c3
--- /dev/null
+++ b/src/ipcalc.c
@@ -0,0 +1,69 @@
+#include <popt.h>
+#include <stdio.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+
+typedef unsigned int int32;
+
+int main(int argc, char ** argv) {
+    int showBroadcast = 0, showNetwork = 0;
+    int rc;
+    poptContext optCon;
+    char * ipStr, * netmaskStr, * chptr;
+    int32 ip, netmask, network, broadcast;
+    struct poptOption optionsTable[] = {
+	    { "broadcast", '\0', 0, &showBroadcast, 0 },
+	    { "network", '\0', 0, &showNetwork, 0 },
+	    { NULL, '\0', 0, 0, 0 },
+    };
+
+    optCon = poptGetContext("ipcalc", argc, argv, optionsTable,0);
+    poptReadDefaultConfig(optCon, 1);
+
+    if ((rc = poptGetNextOpt(optCon)) < -1) {
+	fprintf(stderr, "ipcalc: bad argument %s: %s\n", 
+		poptBadOption(optCon, POPT_BADOPTION_NOALIAS), 
+		poptStrerror(rc));
+	return 1;
+    }
+
+    if (!(ipStr = poptGetArg(optCon))) {
+	fprintf(stderr, "ipcalc: ip address expected\n");
+	return 1;
+    }
+
+    if (!(netmaskStr = poptGetArg(optCon))) {
+	fprintf(stderr, "ipcalc: netmask expected\n");
+	return 1;
+    }
+
+    if ((chptr = poptGetArg(optCon))) {
+	fprintf(stderr, "ipcalc: unexpected argument: %s\n", chptr);
+	return 1;
+    }
+
+    poptFreeContext(optCon);
+
+    if (!inet_aton(ipStr, (struct in_addr *) &ip)) {
+	fprintf(stderr, "ipcalc: bad ip address: %s\n", ipStr);
+	return 1;
+    }
+
+    if (!inet_aton(netmaskStr, (struct in_addr *) &netmask)) {
+	fprintf(stderr, "ipcalc: bad netmask: %s\n", netmaskStr);
+	return 1;
+    }
+
+    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)));
+    }
+
+    return 0;
+}