1 | /* vi: set sw=4 ts=4: */
|
---|
2 | /*
|
---|
3 | * Mini ipcalc implementation for busybox
|
---|
4 | *
|
---|
5 | * By Jordan Crouse <jordan@cosmicpenguin.net>
|
---|
6 | * Stephan Linz <linz@li-pro.net>
|
---|
7 | *
|
---|
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
|
---|
11 | *
|
---|
12 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
|
---|
13 | */
|
---|
14 |
|
---|
15 | #include <getopt.h>
|
---|
16 | #include <sys/socket.h>
|
---|
17 | #include <arpa/inet.h>
|
---|
18 |
|
---|
19 | #include "libbb.h"
|
---|
20 |
|
---|
21 | #define CLASS_A_NETMASK ntohl(0xFF000000)
|
---|
22 | #define CLASS_B_NETMASK ntohl(0xFFFF0000)
|
---|
23 | #define CLASS_C_NETMASK ntohl(0xFFFFFF00)
|
---|
24 |
|
---|
25 | static unsigned long get_netmask(unsigned long ipaddr)
|
---|
26 | {
|
---|
27 | ipaddr = htonl(ipaddr);
|
---|
28 |
|
---|
29 | if ((ipaddr & 0xC0000000) == 0xC0000000)
|
---|
30 | return CLASS_C_NETMASK;
|
---|
31 | else if ((ipaddr & 0x80000000) == 0x80000000)
|
---|
32 | return CLASS_B_NETMASK;
|
---|
33 | else if ((ipaddr & 0x80000000) == 0)
|
---|
34 | return CLASS_A_NETMASK;
|
---|
35 | else
|
---|
36 | return 0;
|
---|
37 | }
|
---|
38 |
|
---|
39 | #if ENABLE_FEATURE_IPCALC_FANCY
|
---|
40 | static int get_prefix(unsigned long netmask)
|
---|
41 | {
|
---|
42 | unsigned long msk = 0x80000000;
|
---|
43 | int ret = 0;
|
---|
44 |
|
---|
45 | netmask = htonl(netmask);
|
---|
46 | while (msk) {
|
---|
47 | if (netmask & msk)
|
---|
48 | ret++;
|
---|
49 | msk >>= 1;
|
---|
50 | }
|
---|
51 | return ret;
|
---|
52 | }
|
---|
53 | #else
|
---|
54 | int get_prefix(unsigned long netmask);
|
---|
55 | #endif
|
---|
56 |
|
---|
57 |
|
---|
58 | #define NETMASK 0x01
|
---|
59 | #define BROADCAST 0x02
|
---|
60 | #define NETWORK 0x04
|
---|
61 | #define NETPREFIX 0x08
|
---|
62 | #define HOSTNAME 0x10
|
---|
63 | #define SILENT 0x20
|
---|
64 |
|
---|
65 | #if ENABLE_FEATURE_IPCALC_LONG_OPTIONS
|
---|
66 | static const char ipcalc_longopts[] ALIGN1 =
|
---|
67 | "netmask\0" No_argument "m"
|
---|
68 | "broadcast\0" No_argument "b"
|
---|
69 | "network\0" No_argument "n"
|
---|
70 | # if ENABLE_FEATURE_IPCALC_FANCY
|
---|
71 | "prefix\0" No_argument "p"
|
---|
72 | "hostname\0" No_argument "h"
|
---|
73 | "silent\0" No_argument "s"
|
---|
74 | # endif
|
---|
75 | ;
|
---|
76 | #endif
|
---|
77 |
|
---|
78 | int ipcalc_main(int argc, char **argv);
|
---|
79 | int ipcalc_main(int argc, char **argv)
|
---|
80 | {
|
---|
81 | unsigned opt;
|
---|
82 | int have_netmask = 0;
|
---|
83 | in_addr_t netmask, broadcast, network, ipaddr;
|
---|
84 | struct in_addr a;
|
---|
85 | char *ipstr;
|
---|
86 |
|
---|
87 | #if ENABLE_FEATURE_IPCALC_LONG_OPTIONS
|
---|
88 | applet_long_options = ipcalc_longopts;
|
---|
89 | #endif
|
---|
90 | opt = getopt32(argv, "mbn" USE_FEATURE_IPCALC_FANCY("phs"));
|
---|
91 | argc -= optind;
|
---|
92 | argv += optind;
|
---|
93 | if (opt & (BROADCAST | NETWORK | NETPREFIX)) {
|
---|
94 | if (argc > 2 || argc <= 0)
|
---|
95 | bb_show_usage();
|
---|
96 | } else {
|
---|
97 | if (argc != 1)
|
---|
98 | bb_show_usage();
|
---|
99 | }
|
---|
100 | if (opt & SILENT)
|
---|
101 | logmode = LOGMODE_NONE; /* Suppress error_msg() output */
|
---|
102 |
|
---|
103 | ipstr = argv[0];
|
---|
104 | if (ENABLE_FEATURE_IPCALC_FANCY) {
|
---|
105 | unsigned long netprefix = 0;
|
---|
106 | char *prefixstr;
|
---|
107 |
|
---|
108 | prefixstr = ipstr;
|
---|
109 |
|
---|
110 | while (*prefixstr) {
|
---|
111 | if (*prefixstr == '/') {
|
---|
112 | *prefixstr = (char)0;
|
---|
113 | prefixstr++;
|
---|
114 | if (*prefixstr) {
|
---|
115 | unsigned msk;
|
---|
116 | netprefix = xatoul_range(prefixstr, 0, 32);
|
---|
117 | netmask = 0;
|
---|
118 | msk = 0x80000000;
|
---|
119 | while (netprefix > 0) {
|
---|
120 | netmask |= msk;
|
---|
121 | msk >>= 1;
|
---|
122 | netprefix--;
|
---|
123 | }
|
---|
124 | netmask = htonl(netmask);
|
---|
125 | /* Even if it was 0, we will signify that we have a netmask. This allows */
|
---|
126 | /* for specification of default routes, etc which have a 0 netmask/prefix */
|
---|
127 | have_netmask = 1;
|
---|
128 | }
|
---|
129 | break;
|
---|
130 | }
|
---|
131 | prefixstr++;
|
---|
132 | }
|
---|
133 | }
|
---|
134 | ipaddr = inet_aton(ipstr, &a);
|
---|
135 |
|
---|
136 | if (ipaddr == 0) {
|
---|
137 | bb_error_msg_and_die("bad IP address: %s", argv[0]);
|
---|
138 | }
|
---|
139 | ipaddr = a.s_addr;
|
---|
140 |
|
---|
141 | if (argc == 2) {
|
---|
142 | if (ENABLE_FEATURE_IPCALC_FANCY && have_netmask) {
|
---|
143 | bb_error_msg_and_die("use prefix or netmask, not both");
|
---|
144 | }
|
---|
145 |
|
---|
146 | netmask = inet_aton(argv[1], &a);
|
---|
147 | if (netmask == 0) {
|
---|
148 | bb_error_msg_and_die("bad netmask: %s", argv[1]);
|
---|
149 | }
|
---|
150 | netmask = a.s_addr;
|
---|
151 | } else {
|
---|
152 |
|
---|
153 | /* JHC - If the netmask wasn't provided then calculate it */
|
---|
154 | if (!ENABLE_FEATURE_IPCALC_FANCY || !have_netmask)
|
---|
155 | netmask = get_netmask(ipaddr);
|
---|
156 | }
|
---|
157 |
|
---|
158 | if (opt & NETMASK) {
|
---|
159 | printf("NETMASK=%s\n", inet_ntoa((*(struct in_addr *) &netmask)));
|
---|
160 | }
|
---|
161 |
|
---|
162 | if (opt & BROADCAST) {
|
---|
163 | broadcast = (ipaddr & netmask) | ~netmask;
|
---|
164 | printf("BROADCAST=%s\n", inet_ntoa((*(struct in_addr *) &broadcast)));
|
---|
165 | }
|
---|
166 |
|
---|
167 | if (opt & NETWORK) {
|
---|
168 | network = ipaddr & netmask;
|
---|
169 | printf("NETWORK=%s\n", inet_ntoa((*(struct in_addr *) &network)));
|
---|
170 | }
|
---|
171 |
|
---|
172 | if (ENABLE_FEATURE_IPCALC_FANCY) {
|
---|
173 | if (opt & NETPREFIX) {
|
---|
174 | printf("PREFIX=%i\n", get_prefix(netmask));
|
---|
175 | }
|
---|
176 |
|
---|
177 | if (opt & HOSTNAME) {
|
---|
178 | struct hostent *hostinfo;
|
---|
179 | int x;
|
---|
180 |
|
---|
181 | hostinfo = gethostbyaddr((char *) &ipaddr, sizeof(ipaddr), AF_INET);
|
---|
182 | if (!hostinfo) {
|
---|
183 | bb_herror_msg_and_die("cannot find hostname for %s", argv[0]);
|
---|
184 | }
|
---|
185 | for (x = 0; hostinfo->h_name[x]; x++) {
|
---|
186 | hostinfo->h_name[x] = tolower(hostinfo->h_name[x]);
|
---|
187 | }
|
---|
188 |
|
---|
189 | printf("HOSTNAME=%s\n", hostinfo->h_name);
|
---|
190 | }
|
---|
191 | }
|
---|
192 |
|
---|
193 | return EXIT_SUCCESS;
|
---|
194 | }
|
---|