summaryrefslogtreecommitdiff
path: root/networking/ipcalc.c
diff options
context:
space:
mode:
authorGlenn L McGrath2002-11-10 23:42:27 +0000
committerGlenn L McGrath2002-11-10 23:42:27 +0000
commitc11986d89eba564945b226660031e624bf897561 (patch)
tree916cab407d266dbbf8f0069e65ab0434583b336c /networking/ipcalc.c
parent912d8f4cbc724ce6ef9d8bd3f73d16d7ef4cf069 (diff)
downloadbusybox-c11986d89eba564945b226660031e624bf897561.zip
busybox-c11986d89eba564945b226660031e624bf897561.tar.gz
ipcalc applet by Stephan Linz and Jordan Crouse
Diffstat (limited to 'networking/ipcalc.c')
-rw-r--r--networking/ipcalc.c164
1 files changed, 164 insertions, 0 deletions
diff --git a/networking/ipcalc.c b/networking/ipcalc.c
new file mode 100644
index 0000000..f130f3b
--- /dev/null
+++ b/networking/ipcalc.c
@@ -0,0 +1,164 @@
+/* vi: set sw=4 ts=4 ai: */
+/*
+ * Mini ipcalc implementation for busybox
+ *
+ * By Jordan Crouse <jordan@cosmicpenguin.net>
+ * Stephan Linz <linz@li-pro.net>
+ *
+ * This is a complete reimplentation of the ipcalc program
+ * from Redhat. I didn't look at their source code, but there
+ * is no denying that this is a loving reimplementation
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <ctype.h>
+#include <getopt.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+
+#include "busybox.h"
+
+#define IPCALC_MSG(CMD,ALTCMD) if (mode & SILENT) {ALTCMD;} else {CMD;}
+
+static unsigned long get_netmask(unsigned long ipaddr)
+{
+ if (ipaddr & 0xC0) {
+ return 0x00FFFFFF; /* Class C */
+ }
+ if (ipaddr & 0x10) {
+ return 0x0000FFFF; /* Class B */
+ }
+ return 0x000000FF; /* Class A */
+}
+
+#define NETMASK 0x01
+#define BROADCAST 0x02
+#define NETWORK 0x04
+#define HOSTNAME 0x08
+#define SILENT 0x80
+
+int ipcalc_main(int argc, char **argv)
+{
+ unsigned char mode = 0;
+
+ unsigned long netmask = 0;
+ unsigned long broadcast = 0;
+ unsigned long network = 0;
+ unsigned long ipaddr = 0;
+
+ int opt = 0;
+
+ struct option long_options[] = {
+ {"netmask", no_argument, NULL, 'n'},
+ {"broadcast", no_argument, NULL, 'b'},
+ {"network", no_argument, NULL, 'w'},
+#ifdef CONFIG_FEATURE_IPCALC_FANCY
+ {"hostname", no_argument, NULL, 'h'},
+ {"silent", no_argument, NULL, 's'},
+#endif
+ {NULL, 0, NULL, 0}
+ };
+
+
+ while ((opt = getopt_long(argc, argv,
+#ifdef CONFIG_FEATURE_IPCALC_FANCY
+ "nbwhs",
+#else
+ "nbw",
+#endif
+ long_options, NULL)) != EOF) {
+ if (opt == 'n')
+ mode |= NETMASK;
+ else if (opt == 'b')
+ mode |= BROADCAST;
+ else if (opt == 'w')
+ mode |= NETWORK;
+#ifdef CONFIG_FEATURE_IPCALC_FANCY
+ else if (opt == 'h')
+ mode |= HOSTNAME;
+ else if (opt == 's')
+ mode |= SILENT;
+#endif
+ else {
+ show_usage();
+ }
+ }
+
+ if (mode & (BROADCAST | NETWORK)) {
+ if (argc - optind > 2) {
+ show_usage();
+ }
+ } else {
+ if (argc - optind != 1) {
+ show_usage();
+ }
+ }
+
+ ipaddr = inet_addr(argv[optind]);
+
+ if (ipaddr == INADDR_NONE) {
+ IPCALC_MSG(error_msg_and_die("bad IP address: %s\n", argv[optind]),
+ exit(EXIT_FAILURE));
+ }
+
+
+ if (argc - optind == 2) {
+ netmask = inet_addr(argv[optind + 1]);
+ }
+
+ if (ipaddr == INADDR_NONE) {
+ IPCALC_MSG(error_msg_and_die("bad netmask: %s\n", argv[optind + 1]),
+ exit(EXIT_FAILURE));
+ }
+
+ /* JHC - If the netmask wasn't provided then calculate it */
+ if (!netmask) {
+ netmask = get_netmask(ipaddr);
+ }
+
+ if (mode & NETMASK) {
+ printf("NETMASK=%s\n", inet_ntoa((*(struct in_addr *) &netmask)));
+ }
+
+ if (mode & BROADCAST) {
+ broadcast = (ipaddr & netmask) | ~netmask;
+ printf("BROADCAST=%s\n", inet_ntoa((*(struct in_addr *) &broadcast)));
+ }
+
+ if (mode & NETWORK) {
+ network = ipaddr & netmask;
+ printf("NETWORK=%s\n", inet_ntoa((*(struct in_addr *) &network)));
+ }
+#ifdef CONFIG_FEATURE_IPCALC_FANCY
+ if (mode & HOSTNAME) {
+ struct hostent *hostinfo;
+ int x;
+
+ hostinfo = gethostbyaddr((char *) &ipaddr, sizeof(ipaddr), AF_INET);
+ if (!hostinfo) {
+ IPCALC_MSG(error_msg("cannot find hostname for %s", argv[optind]);
+ herror(NULL);
+ putc('\n', stderr);,);
+ exit(EXIT_FAILURE);
+ }
+ for (x = 0; hostinfo->h_name[x]; x++) {
+ hostinfo->h_name[x] = tolower(hostinfo->h_name[x]);
+ }
+
+ printf("HOSTNAME=%s\n", hostinfo->h_name);
+ }
+#endif
+
+ return EXIT_SUCCESS;
+}
+
+/* END CODE */
+/*
+Local Variables:
+c-file-style: "linux"
+c-basic-offset: 4
+tab-width: 4
+End:
+*/