1 /* vi: set sw=4 ts=4 ai: */
3 * Mini ipcalc implementation for busybox
5 * By Jordan Crouse <jordan@cosmicpenguin.net>
6 * Stephan Linz <linz@li-pro.net>
8 * This is a complete reimplementation of the ipcalc program
9 * from Red Hat. I didn't look at their source code, but there
10 * is no denying that this is a loving reimplementation
17 #include <sys/socket.h>
18 #include <netinet/in.h>
19 #include <arpa/inet.h>
23 #define IPCALC_MSG(CMD,ALTCMD) if (mode & SILENT) {ALTCMD;} else {CMD;}
25 #define CLASS_A_NETMASK ntohl(0xFF000000)
26 #define CLASS_B_NETMASK ntohl(0xFFFF0000)
27 #define CLASS_C_NETMASK ntohl(0xFFFFFF00)
29 static unsigned long get_netmask(unsigned long ipaddr)
31 ipaddr = htonl(ipaddr);
33 if ((ipaddr & 0xC0000000) == 0xC0000000)
34 return CLASS_C_NETMASK;
35 else if ((ipaddr & 0x80000000) == 0x80000000)
36 return CLASS_B_NETMASK;
37 else if ((ipaddr & 0x80000000) == 0)
38 return CLASS_A_NETMASK;
43 #ifdef CONFIG_FEATURE_IPCALC_FANCY
44 static int get_prefix(unsigned long netmask)
46 unsigned long msk = 0x80000000;
49 netmask = htonl(netmask);
60 #define BROADCAST 0x02
62 #define NETPREFIX 0x08
67 int ipcalc_main(int argc, char **argv)
71 unsigned long netmask;
72 unsigned long broadcast;
73 unsigned long network;
77 #ifdef CONFIG_FEATURE_IPCALC_FANCY
78 unsigned long netprefix = 0;
80 char *ipstr, *prefixstr;
83 static const struct option long_options[] = {
84 {"netmask", no_argument, NULL, 'm'},
85 {"broadcast", no_argument, NULL, 'b'},
86 {"network", no_argument, NULL, 'n'},
87 #ifdef CONFIG_FEATURE_IPCALC_FANCY
88 {"prefix", no_argument, NULL, 'p'},
89 {"hostname", no_argument, NULL, 'h'},
90 {"silent", no_argument, NULL, 's'},
95 bb_applet_long_options = long_options;
96 mode = bb_getopt_ulflags(argc, argv,
97 #ifdef CONFIG_FEATURE_IPCALC_FANCY
103 if (mode & (BROADCAST | NETWORK | NETPREFIX)) {
104 if (argc - optind > 2) {
108 if (argc - optind != 1) {
113 #ifdef CONFIG_FEATURE_IPCALC_FANCY
114 prefixstr = ipstr = argv[optind];
117 if (*prefixstr == '/') {
118 *prefixstr = (char)0;
123 if (safe_strtoul(prefixstr, &netprefix) || netprefix > 32) {
124 IPCALC_MSG(bb_error_msg_and_die("bad IP prefix: %s\n", prefixstr),
129 while (netprefix > 0) {
134 netmask = htonl(netmask);
135 /* Even if it was 0, we will signify that we have a netmask. This allows */
136 /* for specification of default routes, etc which have a 0 netmask/prefix */
143 ipaddr = inet_aton(ipstr, &a);
145 ipaddr = inet_aton(argv[optind], &a);
149 IPCALC_MSG(bb_error_msg_and_die("bad IP address: %s", argv[optind]),
154 if (argc - optind == 2) {
155 #ifdef CONFIG_FEATURE_IPCALC_FANCY
157 IPCALC_MSG(bb_error_msg_and_die("Both prefix and netmask were specified, use one or the other.\n"),
162 netmask = inet_aton(argv[optind + 1], &a);
164 IPCALC_MSG(bb_error_msg_and_die("bad netmask: %s", argv[optind + 1]),
169 #ifdef CONFIG_FEATURE_IPCALC_FANCY
173 /* JHC - If the netmask wasn't provided then calculate it */
174 netmask = get_netmask(ipaddr);
177 if (mode & NETMASK) {
178 printf("NETMASK=%s\n", inet_ntoa((*(struct in_addr *) &netmask)));
181 if (mode & BROADCAST) {
182 broadcast = (ipaddr & netmask) | ~netmask;
183 printf("BROADCAST=%s\n", inet_ntoa((*(struct in_addr *) &broadcast)));
186 if (mode & NETWORK) {
187 network = ipaddr & netmask;
188 printf("NETWORK=%s\n", inet_ntoa((*(struct in_addr *) &network)));
191 #ifdef CONFIG_FEATURE_IPCALC_FANCY
192 if (mode & NETPREFIX) {
193 printf("PREFIX=%i\n", get_prefix(netmask));
196 if (mode & HOSTNAME) {
197 struct hostent *hostinfo;
200 hostinfo = gethostbyaddr((char *) &ipaddr, sizeof(ipaddr), AF_INET);
202 IPCALC_MSG(bb_herror_msg_and_die(
203 "cannot find hostname for %s", argv[optind]),);
206 for (x = 0; hostinfo->h_name[x]; x++) {
207 hostinfo->h_name[x] = tolower(hostinfo->h_name[x]);
210 printf("HOSTNAME=%s\n", hostinfo->h_name);
220 c-file-style: "linux"