1 /* vi: set sw=4 ts=4: */
5 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
7 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
11 * Rani Assaf <rani@magic.metawire.com> 980929: resolve addresses
16 #include "inet_common.h"
18 unsigned get_unsigned(char *arg, const char *errmsg)
24 res = strtoul(arg, &ptr, 0);
25 //FIXME: "" will be accepted too, is it correct?!
26 if (!*ptr && res <= UINT_MAX) {
30 invarg(arg, errmsg); /* does not return */
33 uint32_t get_u32(char *arg, const char *errmsg)
39 res = strtoul(arg, &ptr, 0);
40 //FIXME: "" will be accepted too, is it correct?!
41 if (!*ptr && res <= 0xFFFFFFFFUL) {
45 invarg(arg, errmsg); /* does not return */
48 uint16_t get_u16(char *arg, const char *errmsg)
54 res = strtoul(arg, &ptr, 0);
55 //FIXME: "" will be accepted too, is it correct?!
56 if (!*ptr && res <= 0xFFFF) {
60 invarg(arg, errmsg); /* does not return */
63 int get_addr_1(inet_prefix *addr, char *name, int family)
65 memset(addr, 0, sizeof(*addr));
67 if (strcmp(name, bb_str_default) == 0
68 || strcmp(name, "all") == 0
69 || strcmp(name, "any") == 0
71 addr->family = family;
72 addr->bytelen = (family == AF_INET6 ? 16 : 4);
77 if (strchr(name, ':')) {
78 addr->family = AF_INET6;
79 if (family != AF_UNSPEC && family != AF_INET6)
81 if (inet_pton(AF_INET6, name, addr->data) <= 0)
88 addr->family = AF_INET;
89 if (family != AF_UNSPEC && family != AF_INET)
91 if (inet_pton(AF_INET, name, addr->data) <= 0)
98 static int get_prefix_1(inet_prefix *dst, char *arg, int family)
104 memset(dst, 0, sizeof(*dst));
106 if (strcmp(arg, bb_str_default) == 0
107 || strcmp(arg, "all") == 0
108 || strcmp(arg, "any") == 0
110 dst->family = family;
111 /*dst->bytelen = 0; - done by memset */
116 slash = strchr(arg, '/');
119 err = get_addr_1(dst, arg, family);
121 dst->bitlen = (dst->family == AF_INET6) ? 128 : 32;
123 inet_prefix netmask_pfx;
125 netmask_pfx.family = AF_UNSPEC;
126 plen = bb_strtou(slash + 1, NULL, 0);
127 if ((errno || plen > dst->bitlen)
128 && (get_addr_1(&netmask_pfx, slash + 1, family)))
130 else if (netmask_pfx.family == AF_INET) {
131 /* fill in prefix length of dotted quad */
132 uint32_t mask = ntohl(netmask_pfx.data[0]);
133 uint32_t host = ~mask;
135 /* a valid netmask must be 2^n - 1 */
136 if (!(host & (host + 1))) {
137 for (plen = 0; mask; mask <<= 1)
139 if (plen <= dst->bitlen) {
141 /* dst->flags |= PREFIXLEN_SPECIFIED; */
157 int get_addr(inet_prefix *dst, char *arg, int family)
159 if (family == AF_PACKET) {
160 bb_error_msg_and_die("\"%s\" may be inet %s, but it is not allowed in this context", arg, "address");
162 if (get_addr_1(dst, arg, family)) {
163 bb_error_msg_and_die("an %s %s is expected rather than \"%s\"", "inet", "address", arg);
168 int get_prefix(inet_prefix *dst, char *arg, int family)
170 if (family == AF_PACKET) {
171 bb_error_msg_and_die("\"%s\" may be inet %s, but it is not allowed in this context", arg, "prefix");
173 if (get_prefix_1(dst, arg, family)) {
174 bb_error_msg_and_die("an %s %s is expected rather than \"%s\"", "inet", "prefix", arg);
179 uint32_t get_addr32(char *name)
183 if (get_addr_1(&addr, name, AF_INET)) {
184 bb_error_msg_and_die("an %s %s is expected rather than \"%s\"", "IP", "address", name);
189 void incomplete_command(void)
191 bb_error_msg_and_die("command line is not complete, try option \"help\"");
194 void invarg(const char *arg, const char *opt)
196 bb_error_msg_and_die(bb_msg_invalid_arg, arg, opt);
199 void duparg(const char *key, const char *arg)
201 bb_error_msg_and_die("duplicate \"%s\": \"%s\" is the second value", key, arg);
204 void duparg2(const char *key, const char *arg)
206 bb_error_msg_and_die("either \"%s\" is duplicate, or \"%s\" is garbage", key, arg);
209 int inet_addr_match(inet_prefix *a, inet_prefix *b, int bits)
211 uint32_t *a1 = a->data;
212 uint32_t *a2 = b->data;
213 int words = bits >> 5;
218 if (memcmp(a1, a2, words << 2))
228 mask = htonl((0xffffffff) << (0x20 - bits));
230 if ((w1 ^ w2) & mask)
237 const char *rt_addr_n2a(int af,
238 void *addr, char *buf, int buflen)
243 return inet_ntop(af, addr, buf, buflen);
249 #ifdef RESOLVE_HOSTNAMES
250 const char *format_host(int af, int len, void *addr, char *buf, int buflen)
253 struct hostent *h_ent;
267 h_ent = gethostbyaddr(addr, len, af);
269 safe_strncpy(buf, h_ent->h_name, buflen);
274 return rt_addr_n2a(af, addr, buf, buflen);