networking/libiproute/utils.c

/* vi: set sw=4 ts=4: */
/*
 * utils.c
 *
 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
 *
 * 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
1	/* vi: set sw=4 ts=4: */
2	/*
3	* utils.c
4	*
5	* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
6	*
7	* Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
8	*
9	* Changes:
10	*
11	* Rani Assaf <rani@magic.metawire.com> 980929: resolve addresses
12	*/
13
14	#include "libbb.h"
15	#include "utils.h"
16	#include "inet_common.h"
17
18	unsigned get_unsigned(char arg, const char errmsg)
19	{
20	unsigned long res;
21	char *ptr;
22
23	if (*arg) {
24	res = strtoul(arg, &ptr, 0);
25	//FIXME: "" will be accepted too, is it correct?!
26	if (!*ptr && res <= UINT_MAX) {
27	return res;
28	}
29	}
30	invarg(arg, errmsg); /* does not return */
31	}
32
33	uint32_t get_u32(char arg, const char errmsg)
34	{
35	unsigned long res;
36	char *ptr;
37
38	if (*arg) {
39	res = strtoul(arg, &ptr, 0);
40	//FIXME: "" will be accepted too, is it correct?!
41	if (!*ptr && res <= 0xFFFFFFFFUL) {
42	return res;
43	}
44	}
45	invarg(arg, errmsg); /* does not return */
46	}
47
48	uint16_t get_u16(char arg, const char errmsg)
49	{
50	unsigned long res;
51	char *ptr;
52
53	if (*arg) {
54	res = strtoul(arg, &ptr, 0);
55	//FIXME: "" will be accepted too, is it correct?!
56	if (!*ptr && res <= 0xFFFF) {
57	return res;
58	}
59	}
60	invarg(arg, errmsg); /* does not return */
61	}
62
63	int get_addr_1(inet_prefix addr, char name, int family)
64	{
65	memset(addr, 0, sizeof(*addr));
66
67	if (strcmp(name, bb_str_default) == 0
68	\|\| strcmp(name, "all") == 0
69	\|\| strcmp(name, "any") == 0
70	) {
71	addr->family = family;
72	addr->bytelen = (family == AF_INET6 ? 16 : 4);
73	addr->bitlen = -1;
74	return 0;
75	}
76
77	if (strchr(name, ':')) {
78	addr->family = AF_INET6;
79	if (family != AF_UNSPEC && family != AF_INET6)
80	return -1;
81	if (inet_pton(AF_INET6, name, addr->data) <= 0)
82	return -1;
83	addr->bytelen = 16;
84	addr->bitlen = -1;
85	return 0;
86	}
87
88	addr->family = AF_INET;
89	if (family != AF_UNSPEC && family != AF_INET)
90	return -1;
91	if (inet_pton(AF_INET, name, addr->data) <= 0)
92	return -1;
93	addr->bytelen = 4;
94	addr->bitlen = -1;
95	return 0;
96	}
97
98	static int get_prefix_1(inet_prefix dst, char arg, int family)
99	{
100	int err;
101	unsigned plen;
102	char *slash;
103
104	memset(dst, 0, sizeof(*dst));
105
106	if (strcmp(arg, bb_str_default) == 0
107	\|\| strcmp(arg, "all") == 0
108	\|\| strcmp(arg, "any") == 0
109	) {
110	dst->family = family;
111	/dst->bytelen = 0; - done by memset /
112	/dst->bitlen = 0;/
113	return 0;
114	}
115
116	slash = strchr(arg, '/');
117	if (slash)
118	*slash = '\0';
119	err = get_addr_1(dst, arg, family);
120	if (err == 0) {
121	dst->bitlen = (dst->family == AF_INET6) ? 128 : 32;
122	if (slash) {
123	inet_prefix netmask_pfx;
124
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)))
129	err = -1;
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;
134
135	/* a valid netmask must be 2^n - 1 */
136	if (!(host & (host + 1))) {
137	for (plen = 0; mask; mask <<= 1)
138	++plen;
139	if (plen <= dst->bitlen) {
140	dst->bitlen = plen;
141	/* dst->flags \|= PREFIXLEN_SPECIFIED; */
142	} else
143	err = -1;
144	} else
145	err = -1;
146	} else {
147	/* plain prefix */
148	dst->bitlen = plen;
149	}
150	}
151	}
152	if (slash)
153	*slash = '/';
154	return err;
155	}
156
157	int get_addr(inet_prefix dst, char arg, int family)
158	{
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");
161	}
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);
164	}
165	return 0;
166	}
167
168	int get_prefix(inet_prefix dst, char arg, int family)
169	{
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");
172	}
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);
175	}
176	return 0;
177	}
178
179	uint32_t get_addr32(char *name)
180	{
181	inet_prefix addr;
182
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);
185	}
186	return addr.data[0];
187	}
188
189	void incomplete_command(void)
190	{
191	bb_error_msg_and_die("command line is not complete, try option \"help\"");
192	}
193
194	void invarg(const char arg, const char opt)
195	{
196	bb_error_msg_and_die(bb_msg_invalid_arg, arg, opt);
197	}
198
199	void duparg(const char key, const char arg)
200	{
201	bb_error_msg_and_die("duplicate \"%s\": \"%s\" is the second value", key, arg);
202	}
203
204	void duparg2(const char key, const char arg)
205	{
206	bb_error_msg_and_die("either \"%s\" is duplicate, or \"%s\" is garbage", key, arg);
207	}
208
209	int inet_addr_match(inet_prefix a, inet_prefix b, int bits)
210	{
211	uint32_t *a1 = a->data;
212	uint32_t *a2 = b->data;
213	int words = bits >> 5;
214
215	bits &= 0x1f;
216
217	if (words)
218	if (memcmp(a1, a2, words << 2))
219	return -1;
220
221	if (bits) {
222	uint32_t w1, w2;
223	uint32_t mask;
224
225	w1 = a1[words];
226	w2 = a2[words];
227
228	mask = htonl((0xffffffff) << (0x20 - bits));
229
230	if ((w1 ^ w2) & mask)
231	return 1;
232	}
233
234	return 0;
235	}
236
237	const char *rt_addr_n2a(int af,
238	void addr, char buf, int buflen)
239	{
240	switch (af) {
241	case AF_INET:
242	case AF_INET6:
243	return inet_ntop(af, addr, buf, buflen);
244	default:
245	return "???";
246	}
247	}
248
249	#ifdef RESOLVE_HOSTNAMES
250	const char format_host(int af, int len, void addr, char *buf, int buflen)
251	{
252	if (resolve_hosts) {
253	struct hostent *h_ent;
254
255	if (len <= 0) {
256	switch (af) {
257	case AF_INET:
258	len = 4;
259	break;
260	case AF_INET6:
261	len = 16;
262	break;
263	default:;
264	}
265	}
266	if (len > 0) {
267	h_ent = gethostbyaddr(addr, len, af);
268	if (h_ent != NULL) {
269	safe_strncpy(buf, h_ent->h_name, buflen);
270	return buf;
271	}
272	}
273	}
274	return rt_addr_n2a(af, addr, buf, buflen);
275	}
276	#endif