Contents of /tags/mkinitrd-6_3_1/busybox/networking/ipcalc.c
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Sat Sep 1 22:45:15 2007 UTC (16 years, 9 months ago) by niro
Original Path: trunk/mkinitrd-magellan/busybox/networking/ipcalc.c
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File size: 4572 byte(s)
Sat Sep 1 22:45:15 2007 UTC (16 years, 9 months ago) by niro
Original Path: trunk/mkinitrd-magellan/busybox/networking/ipcalc.c
File MIME type: text/plain
File size: 4572 byte(s)
-import if magellan mkinitrd; it is a fork of redhats mkinitrd-5.0.8 with all magellan patches and features; deprecates magellan-src/mkinitrd
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 "busybox.h" |
16 | #include <ctype.h> |
17 | #include <getopt.h> |
18 | #include <sys/socket.h> |
19 | #include <arpa/inet.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 | #ifdef CONFIG_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 struct option long_options[] = { |
67 | { "netmask", no_argument, NULL, 'm' }, |
68 | { "broadcast", no_argument, NULL, 'b' }, |
69 | { "network", no_argument, NULL, 'n' }, |
70 | # if ENABLE_FEATURE_IPCALC_FANCY |
71 | { "prefix", no_argument, NULL, 'p' }, |
72 | { "hostname", no_argument, NULL, 'h' }, |
73 | { "silent", no_argument, NULL, 's' }, |
74 | # endif |
75 | { NULL, 0, NULL, 0 } |
76 | }; |
77 | #endif |
78 | |
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 = long_options; |
89 | #endif |
90 | opt = getopt32(argc, 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 | } |