aboutsummaryrefslogtreecommitdiff
path: root/networking/libiproute/utils.c
blob: 5125617c7941567e713ac719bd89cfb629a4f87d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
/* vi: set sw=4 ts=4: */
/*
 * utils.c
 *
 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
 *
 * Authors:	Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
 *
 * Changes:
 *
 * Rani Assaf <rani@magic.metawire.com> 980929:	resolve addresses
 */

#include "libbb.h"
#include "utils.h"
#include "inet_common.h"

unsigned get_unsigned(char *arg, const char *errmsg)
{
	unsigned long res;
	char *ptr;

	if (*arg) {
		res = strtoul(arg, &ptr, 0);
//FIXME: "" will be accepted too, is it correct?!
		if (!*ptr && res <= UINT_MAX) {
			return res;
		}
	}
	invarg(arg, errmsg); /* does not return */
}

uint32_t get_u32(char *arg, const char *errmsg)
{
	unsigned long res;
	char *ptr;

	if (*arg) {
		res = strtoul(arg, &ptr, 0);
//FIXME: "" will be accepted too, is it correct?!
		if (!*ptr && res <= 0xFFFFFFFFUL) {
			return res;
		}
	}
	invarg(arg, errmsg); /* does not return */
}

uint16_t get_u16(char *arg, const char *errmsg)
{
	unsigned long res;
	char *ptr;

	if (*arg) {
		res = strtoul(arg, &ptr, 0);
//FIXME: "" will be accepted too, is it correct?!
		if (!*ptr && res <= 0xFFFF) {
			return res;
		}
	}
	invarg(arg, errmsg); /* does not return */
}

int get_addr_1(inet_prefix *addr, char *name, int family)
{
	memset(addr, 0, sizeof(*addr));

	if (strcmp(name, bb_str_default) == 0
	 || strcmp(name, "all") == 0
	 || strcmp(name, "any") == 0
	) {
		addr->family = family;
		addr->bytelen = (family == AF_INET6 ? 16 : 4);
		addr->bitlen = -1;
		return 0;
	}

	if (strchr(name, ':')) {
		addr->family = AF_INET6;
		if (family != AF_UNSPEC && family != AF_INET6)
			return -1;
		if (inet_pton(AF_INET6, name, addr->data) <= 0)
			return -1;
		addr->bytelen = 16;
		addr->bitlen = -1;
		return 0;
	}

	addr->family = AF_INET;
	if (family != AF_UNSPEC && family != AF_INET)
		return -1;
	if (inet_pton(AF_INET, name, addr->data) <= 0)
		return -1;
	addr->bytelen = 4;
	addr->bitlen = -1;
	return 0;
}

static int get_prefix_1(inet_prefix *dst, char *arg, int family)
{
	int err;
	unsigned plen;
	char *slash;

	memset(dst, 0, sizeof(*dst));

	if (strcmp(arg, bb_str_default) == 0
	 || strcmp(arg, "all") == 0
	 || strcmp(arg, "any") == 0
	) {
		dst->family = family;
		/*dst->bytelen = 0; - done by memset */
		/*dst->bitlen = 0;*/
		return 0;
	}

	slash = strchr(arg, '/');
	if (slash)
		*slash = '\0';
	err = get_addr_1(dst, arg, family);
	if (err == 0) {
		dst->bitlen = (dst->family == AF_INET6) ? 128 : 32;
		if (slash) {
			inet_prefix netmask_pfx;

			netmask_pfx.family = AF_UNSPEC;
			plen = bb_strtou(slash + 1, NULL, 0);
			if ((errno || plen > dst->bitlen)
			 && (get_addr_1(&netmask_pfx, slash + 1, family)))
				err = -1;
			else if (netmask_pfx.family == AF_INET) {
				/* fill in prefix length of dotted quad */
				uint32_t mask = ntohl(netmask_pfx.data[0]);
				uint32_t host = ~mask;

				/* a valid netmask must be 2^n - 1 */
				if (!(host & (host + 1))) {
					for (plen = 0; mask; mask <<= 1)
						++plen;
					if (plen <= dst->bitlen) {
						dst->bitlen = plen;
						/* dst->flags |= PREFIXLEN_SPECIFIED; */
					} else
						err = -1;
				} else
					err = -1;
			} else {
				/* plain prefix */
				dst->bitlen = plen;
			}
		}
	}
	if (slash)
		*slash = '/';
	return err;
}

int get_addr(inet_prefix *dst, char *arg, int family)
{
	if (family == AF_PACKET) {
		bb_error_msg_and_die("\"%s\" may be inet %s, but it is not allowed in this context", arg, "address");
	}
	if (get_addr_1(dst, arg, family)) {
		bb_error_msg_and_die("an %s %s is expected rather than \"%s\"", "inet", "address", arg);
	}
	return 0;
}

int get_prefix(inet_prefix *dst, char *arg, int family)
{
	if (family == AF_PACKET) {
		bb_error_msg_and_die("\"%s\" may be inet %s, but it is not allowed in this context", arg, "prefix");
	}
	if (get_prefix_1(dst, arg, family)) {
		bb_error_msg_and_die("an %s %s is expected rather than \"%s\"", "inet", "prefix", arg);
	}
	return 0;
}

uint32_t get_addr32(char *name)
{
	inet_prefix addr;

	if (get_addr_1(&addr, name, AF_INET)) {
		bb_error_msg_and_die("an %s %s is expected rather than \"%s\"", "IP", "address", name);
	}
	return addr.data[0];
}

void incomplete_command(void)
{
	bb_error_msg_and_die("command line is not complete, try option \"help\"");
}

void invarg(const char *arg, const char *opt)
{
	bb_error_msg_and_die(bb_msg_invalid_arg, arg, opt);
}

void duparg(const char *key, const char *arg)
{
	bb_error_msg_and_die("duplicate \"%s\": \"%s\" is the second value", key, arg);
}

void duparg2(const char *key, const char *arg)
{
	bb_error_msg_and_die("either \"%s\" is duplicate, or \"%s\" is garbage", key, arg);
}

int inet_addr_match(inet_prefix *a, inet_prefix *b, int bits)
{
	uint32_t *a1 = a->data;
	uint32_t *a2 = b->data;
	int words = bits >> 5;

	bits &= 0x1f;

	if (words)
		if (memcmp(a1, a2, words << 2))
			return -1;

	if (bits) {
		uint32_t w1, w2;
		uint32_t mask;

		w1 = a1[words];
		w2 = a2[words];

		mask = htonl((0xffffffff) << (0x20 - bits));

		if ((w1 ^ w2) & mask)
			return 1;
	}

	return 0;
}

const char *rt_addr_n2a(int af,
		void *addr, char *buf, int buflen)
{
	switch (af) {
	case AF_INET:
	case AF_INET6:
		return inet_ntop(af, addr, buf, buflen);
	default:
		return "???";
	}
}

#ifdef RESOLVE_HOSTNAMES
const char *format_host(int af, int len, void *addr, char *buf, int buflen)
{
	if (resolve_hosts) {
		struct hostent *h_ent;

		if (len <= 0) {
			switch (af) {
			case AF_INET:
				len = 4;
				break;
			case AF_INET6:
				len = 16;
				break;
			default:;
			}
		}
		if (len > 0) {
			h_ent = gethostbyaddr(addr, len, af);
			if (h_ent != NULL) {
				safe_strncpy(buf, h_ent->h_name, buflen);
				return buf;
			}
		}
	}
	return rt_addr_n2a(af, addr, buf, buflen);
}
#endif