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 reimplentation of the ipcalc program
9 * from Redhat. 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;
44 #define BROADCAST 0x02
49 int ipcalc_main(int argc, char **argv)
53 unsigned long netmask = 0;
54 unsigned long broadcast;
55 unsigned long network;
58 static const struct option long_options[] = {
59 {"netmask", no_argument, NULL, 'n'},
60 {"broadcast", no_argument, NULL, 'b'},
61 {"network", no_argument, NULL, 'w'},
62 #ifdef CONFIG_FEATURE_IPCALC_FANCY
63 {"hostname", no_argument, NULL, 'h'},
64 {"silent", no_argument, NULL, 's'},
69 bb_applet_long_options = long_options;
70 mode = bb_getopt_ulflags(argc, argv,
71 #ifdef CONFIG_FEATURE_IPCALC_FANCY
76 if (mode & (BROADCAST | NETWORK)) {
77 if (argc - optind > 2) {
81 if (argc - optind != 1) {
86 ipaddr = inet_addr(argv[optind]);
88 if (ipaddr == INADDR_NONE) {
89 IPCALC_MSG(bb_error_msg_and_die("bad IP address: %s", argv[optind]),
94 if (argc - optind == 2) {
95 netmask = inet_addr(argv[optind + 1]);
98 if (ipaddr == INADDR_NONE) {
99 IPCALC_MSG(bb_error_msg_and_die("bad netmask: %s", argv[optind + 1]),
103 /* JHC - If the netmask wasn't provided then calculate it */
105 netmask = get_netmask(ipaddr);
108 if (mode & NETMASK) {
109 printf("NETMASK=%s\n", inet_ntoa((*(struct in_addr *) &netmask)));
112 if (mode & BROADCAST) {
113 broadcast = (ipaddr & netmask) | ~netmask;
114 printf("BROADCAST=%s\n", inet_ntoa((*(struct in_addr *) &broadcast)));
117 if (mode & NETWORK) {
118 network = ipaddr & netmask;
119 printf("NETWORK=%s\n", inet_ntoa((*(struct in_addr *) &network)));
121 #ifdef CONFIG_FEATURE_IPCALC_FANCY
122 if (mode & HOSTNAME) {
123 struct hostent *hostinfo;
126 hostinfo = gethostbyaddr((char *) &ipaddr, sizeof(ipaddr), AF_INET);
128 IPCALC_MSG(bb_herror_msg_and_die(
129 "cannot find hostname for %s", argv[optind]),);
132 for (x = 0; hostinfo->h_name[x]; x++) {
133 hostinfo->h_name[x] = tolower(hostinfo->h_name[x]);
136 printf("HOSTNAME=%s\n", hostinfo->h_name);
146 c-file-style: "linux"