-/* vi: set sw=4 ts=4 ai: */
+/* vi: set sw=4 ts=4: */
/*
* 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
+ * This is a complete reimplementation of the ipcalc program
+ * from Red Hat. I didn't look at their source code, but there
* is no denying that this is a loving reimplementation
+ *
+ * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
*/
-#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"
+#include "libbb.h"
-#define IPCALC_MSG(CMD,ALTCMD) if (mode & SILENT) {ALTCMD;} else {CMD;}
+#define CLASS_A_NETMASK ntohl(0xFF000000)
+#define CLASS_B_NETMASK ntohl(0xFFFF0000)
+#define CLASS_C_NETMASK ntohl(0xFFFFFF00)
static unsigned long get_netmask(unsigned long ipaddr)
{
- if (ipaddr & 0xC0) {
- return 0x00FFFFFF; /* Class C */
- }
- if (ipaddr & 0x10) {
- return 0x0000FFFF; /* Class B */
+ ipaddr = htonl(ipaddr);
+
+ if ((ipaddr & 0xC0000000) == 0xC0000000)
+ return CLASS_C_NETMASK;
+ else if ((ipaddr & 0x80000000) == 0x80000000)
+ return CLASS_B_NETMASK;
+ else if ((ipaddr & 0x80000000) == 0)
+ return CLASS_A_NETMASK;
+ else
+ return 0;
+}
+
+#if ENABLE_FEATURE_IPCALC_FANCY
+static int get_prefix(unsigned long netmask)
+{
+ unsigned long msk = 0x80000000;
+ int ret = 0;
+
+ netmask = htonl(netmask);
+ while (msk) {
+ if (netmask & msk)
+ ret++;
+ msk >>= 1;
}
- return 0x000000FF; /* Class A */
+ return ret;
}
+#else
+int get_prefix(unsigned long netmask);
+#endif
+
#define NETMASK 0x01
#define BROADCAST 0x02
#define NETWORK 0x04
-#define HOSTNAME 0x08
-#define SILENT 0x80
+#define NETPREFIX 0x08
+#define HOSTNAME 0x10
+#define SILENT 0x20
+
+#if ENABLE_FEATURE_IPCALC_LONG_OPTIONS
+ static const char ipcalc_longopts[] ALIGN1 =
+ "netmask\0" No_argument "m"
+ "broadcast\0" No_argument "b"
+ "network\0" No_argument "n"
+# if ENABLE_FEATURE_IPCALC_FANCY
+ "prefix\0" No_argument "p"
+ "hostname\0" No_argument "h"
+ "silent\0" No_argument "s"
+# endif
+ ;
+#endif
+int ipcalc_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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'},
+ unsigned opt;
+ int have_netmask = 0;
+ in_addr_t netmask, broadcast, network, ipaddr;
+ struct in_addr a;
+ char *ipstr;
+
+#if ENABLE_FEATURE_IPCALC_LONG_OPTIONS
+ applet_long_options = ipcalc_longopts;
#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 {
- bb_show_usage();
- }
- }
-
- if (mode & (BROADCAST | NETWORK)) {
- if (argc - optind > 2) {
+ opt = getopt32(argv, "mbn" USE_FEATURE_IPCALC_FANCY("phs"));
+ argc -= optind;
+ argv += optind;
+ if (opt & (BROADCAST | NETWORK | NETPREFIX)) {
+ if (argc > 2 || argc <= 0)
bb_show_usage();
- }
} else {
- if (argc - optind != 1) {
+ if (argc != 1)
bb_show_usage();
+ }
+ if (opt & SILENT)
+ logmode = LOGMODE_NONE; /* Suppress error_msg() output */
+
+ ipstr = argv[0];
+ if (ENABLE_FEATURE_IPCALC_FANCY) {
+ unsigned long netprefix = 0;
+ char *prefixstr;
+
+ prefixstr = ipstr;
+
+ while (*prefixstr) {
+ if (*prefixstr == '/') {
+ *prefixstr = (char)0;
+ prefixstr++;
+ if (*prefixstr) {
+ unsigned msk;
+ netprefix = xatoul_range(prefixstr, 0, 32);
+ netmask = 0;
+ msk = 0x80000000;
+ while (netprefix > 0) {
+ netmask |= msk;
+ msk >>= 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_aton(ipstr, &a);
- ipaddr = inet_addr(argv[optind]);
-
- if (ipaddr == INADDR_NONE) {
- IPCALC_MSG(bb_error_msg_and_die("bad IP address: %s\n", argv[optind]),
- exit(EXIT_FAILURE));
+ if (ipaddr == 0) {
+ bb_error_msg_and_die("bad IP address: %s", argv[0]);
}
+ ipaddr = a.s_addr;
+ if (argc == 2) {
+ if (ENABLE_FEATURE_IPCALC_FANCY && have_netmask) {
+ bb_error_msg_and_die("use prefix or netmask, not both");
+ }
- if (argc - optind == 2) {
- netmask = inet_addr(argv[optind + 1]);
- }
-
- if (ipaddr == INADDR_NONE) {
- IPCALC_MSG(bb_error_msg_and_die("bad netmask: %s\n", argv[optind + 1]),
- exit(EXIT_FAILURE));
- }
+ netmask = inet_aton(argv[1], &a);
+ if (netmask == 0) {
+ bb_error_msg_and_die("bad netmask: %s", argv[1]);
+ }
+ netmask = a.s_addr;
+ } else {
- /* JHC - If the netmask wasn't provided then calculate it */
- if (!netmask) {
- netmask = get_netmask(ipaddr);
+ /* JHC - If the netmask wasn't provided then calculate it */
+ if (!ENABLE_FEATURE_IPCALC_FANCY || !have_netmask)
+ netmask = get_netmask(ipaddr);
}
- if (mode & NETMASK) {
+ if (opt & NETMASK) {
printf("NETMASK=%s\n", inet_ntoa((*(struct in_addr *) &netmask)));
}
- if (mode & BROADCAST) {
+ if (opt & BROADCAST) {
broadcast = (ipaddr & netmask) | ~netmask;
printf("BROADCAST=%s\n", inet_ntoa((*(struct in_addr *) &broadcast)));
}
- if (mode & NETWORK) {
+ if (opt & 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(bb_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]);
+
+ if (ENABLE_FEATURE_IPCALC_FANCY) {
+ if (opt & NETPREFIX) {
+ printf("PREFIX=%i\n", get_prefix(netmask));
}
- printf("HOSTNAME=%s\n", hostinfo->h_name);
+ if (opt & HOSTNAME) {
+ struct hostent *hostinfo;
+
+ hostinfo = gethostbyaddr((char *) &ipaddr, sizeof(ipaddr), AF_INET);
+ if (!hostinfo) {
+ bb_herror_msg_and_die("cannot find hostname for %s", argv[0]);
+ }
+ str_tolower(hostinfo->h_name);
+
+ 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:
-*/
projects / oweals / busybox.git / blobdiff