busybox/libbb/inet_common.c

/* vi: set sw=4 ts=4: */
/*
 * stolen from net-tools-1.59 and stripped down for busybox by
 *                      Erik Andersen <andersen@codepoet.org>
 *
 * Heavily modified by Manuel Novoa III       Mar 12, 2001
 *
 * Version:     $Id: inet_common.c,v 1.1 2007-09-01 22:43:51 niro Exp $
 *
 */

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

int INET_resolve(const char *name, struct sockaddr_in *s_in, int hostfirst)
{
	struct hostent *hp;
	struct netent *np;

	/* Grmpf. -FvK */
	s_in->sin_family = AF_INET;
	s_in->sin_port = 0;

	/* Default is special, meaning 0.0.0.0. */
	if (!strcmp(name, bb_str_default)) {
		s_in->sin_addr.s_addr = INADDR_ANY;
		return 1;
	}
	/* Look to see if it's a dotted quad. */
	if (inet_aton(name, &s_in->sin_addr)) {
		return 0;
	}
	/* If we expect this to be a hostname, try hostname database first */
#ifdef DEBUG
	if (hostfirst) {
		bb_error_msg("gethostbyname (%s)", name);
	}
#endif
	if (hostfirst && (hp = gethostbyname(name)) != (struct hostent *) NULL) {
		memcpy((char *) &s_in->sin_addr, (char *) hp->h_addr_list[0],
			   sizeof(struct in_addr));
		return 0;
	}
	/* Try the NETWORKS database to see if this is a known network. */
#ifdef DEBUG
	bb_error_msg("getnetbyname (%s)", name);
#endif
	if ((np = getnetbyname(name)) != (struct netent *) NULL) {
		s_in->sin_addr.s_addr = htonl(np->n_net);
		return 1;
	}
	if (hostfirst) {
		/* Don't try again */
		return -1;
	}
#ifdef DEBUG
	res_init();
	_res.options |= RES_DEBUG;
#endif

#ifdef DEBUG
	bb_error_msg("gethostbyname (%s)", name);
#endif
	if ((hp = gethostbyname(name)) == (struct hostent *) NULL) {
		return -1;
	}
	memcpy((char *) &s_in->sin_addr, (char *) hp->h_addr_list[0],
		   sizeof(struct in_addr));

	return 0;
}

/* cache */
struct addr {
	struct sockaddr_in addr;
	char *name;
	int host;
	struct addr *next;
};

static struct addr *INET_nn = NULL;	/* addr-to-name cache           */

/* numeric: & 0x8000: default instead of *,
 *          & 0x4000: host instead of net,
 *          & 0x0fff: don't resolve
 */
int INET_rresolve(char *name, size_t len, struct sockaddr_in *s_in,
				  int numeric, unsigned int netmask)
{
	struct hostent *ent;
	struct netent *np;
	struct addr *pn;
	unsigned long ad, host_ad;
	int host = 0;

	/* Grmpf. -FvK */
	if (s_in->sin_family != AF_INET) {
#ifdef DEBUG
		bb_error_msg("rresolve: unsupport address family %d !",
				  s_in->sin_family);
#endif
		errno = EAFNOSUPPORT;
		return -1;
	}
	ad = (unsigned long) s_in->sin_addr.s_addr;
#ifdef DEBUG
	bb_error_msg("rresolve: %08lx, mask %08x, num %08x", ad, netmask, numeric);
#endif
	if (ad == INADDR_ANY) {
		if ((numeric & 0x0FFF) == 0) {
			if (numeric & 0x8000)
				safe_strncpy(name, bb_str_default, len);
			else
				safe_strncpy(name, "*", len);
			return 0;
		}
	}
	if (numeric & 0x0FFF) {
		safe_strncpy(name, inet_ntoa(s_in->sin_addr), len);
		return 0;
	}

	if ((ad & (~netmask)) != 0 || (numeric & 0x4000))
		host = 1;
	pn = INET_nn;
	while (pn != NULL) {
		if (pn->addr.sin_addr.s_addr == ad && pn->host == host) {
			safe_strncpy(name, pn->name, len);
#ifdef DEBUG
			bb_error_msg("rresolve: found %s %08lx in cache",
					  (host ? "host" : "net"), ad);
#endif
			return 0;
		}
		pn = pn->next;
	}

	host_ad = ntohl(ad);
	np = NULL;
	ent = NULL;
	if (host) {
#ifdef DEBUG
		bb_error_msg("gethostbyaddr (%08lx)", ad);
#endif
		ent = gethostbyaddr((char *) &ad, 4, AF_INET);
		if (ent != NULL) {
			safe_strncpy(name, ent->h_name, len);
		}
	} else {
#ifdef DEBUG
		bb_error_msg("getnetbyaddr (%08lx)", host_ad);
#endif
		np = getnetbyaddr(host_ad, AF_INET);
		if (np != NULL) {
			safe_strncpy(name, np->n_name, len);
		}
	}
	if ((ent == NULL) && (np == NULL)) {
		safe_strncpy(name, inet_ntoa(s_in->sin_addr), len);
	}
	pn = xmalloc(sizeof(struct addr));
	pn->addr = *s_in;
	pn->next = INET_nn;
	pn->host = host;
	pn->name = xstrdup(name);
	INET_nn = pn;

	return 0;
}

#ifdef CONFIG_FEATURE_IPV6

int INET6_resolve(const char *name, struct sockaddr_in6 *sin6)
{
	struct addrinfo req, *ai;
	int s;

	memset(&req, '\0', sizeof req);
	req.ai_family = AF_INET6;
	s = getaddrinfo(name, NULL, &req, &ai);
	if (s) {
		bb_error_msg("getaddrinfo: %s: %d", name, s);
		return -1;
	}
	memcpy(sin6, ai->ai_addr, sizeof(struct sockaddr_in6));

	freeaddrinfo(ai);

	return 0;
}

#ifndef IN6_IS_ADDR_UNSPECIFIED
# define IN6_IS_ADDR_UNSPECIFIED(a) \
	(((uint32_t *) (a))[0] == 0 && ((uint32_t *) (a))[1] == 0 && \
	 ((uint32_t *) (a))[2] == 0 && ((uint32_t *) (a))[3] == 0)
#endif


int INET6_rresolve(char *name, size_t len, struct sockaddr_in6 *sin6,
				   int numeric)
{
	int s;

	/* Grmpf. -FvK */
	if (sin6->sin6_family != AF_INET6) {
#ifdef DEBUG
		bb_error_msg("rresolve: unsupport address family %d!",
				  sin6->sin6_family);
#endif
		errno = EAFNOSUPPORT;
		return -1;
	}
	if (numeric & 0x7FFF) {
		inet_ntop(AF_INET6, &sin6->sin6_addr, name, len);
		return 0;
	}
	if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
		if (numeric & 0x8000) {
			strcpy(name, bb_str_default);
		} else {
			name[0] = '*';
			name[1] = '\0';
		}
		return 0;
	}

	s = getnameinfo((struct sockaddr *) sin6, sizeof(struct sockaddr_in6), name, len, NULL, 0, 0);
	if (s) {
		bb_error_msg("getnameinfo failed");
		return -1;
	}
	return 0;
}

#endif							/* CONFIG_FEATURE_IPV6 */
1	/* vi: set sw=4 ts=4: */
2	/*
3	* stolen from net-tools-1.59 and stripped down for busybox by
4	* Erik Andersen <andersen@codepoet.org>
5	*
6	* Heavily modified by Manuel Novoa III Mar 12, 2001
7	*
8	* Version: $Id: inet_common.c,v 1.1 2007-09-01 22:43:51 niro Exp $
9	*
10	*/
11
12	#include "libbb.h"
13	#include "inet_common.h"
14
15	int INET_resolve(const char name, struct sockaddr_in s_in, int hostfirst)
16	{
17	struct hostent *hp;
18	struct netent *np;
19
20	/* Grmpf. -FvK */
21	s_in->sin_family = AF_INET;
22	s_in->sin_port = 0;
23
24	/* Default is special, meaning 0.0.0.0. */
25	if (!strcmp(name, bb_str_default)) {
26	s_in->sin_addr.s_addr = INADDR_ANY;
27	return 1;
28	}
29	/* Look to see if it's a dotted quad. */
30	if (inet_aton(name, &s_in->sin_addr)) {
31	return 0;
32	}
33	/* If we expect this to be a hostname, try hostname database first */
34	#ifdef DEBUG
35	if (hostfirst) {
36	bb_error_msg("gethostbyname (%s)", name);
37	}
38	#endif
39	if (hostfirst && (hp = gethostbyname(name)) != (struct hostent *) NULL) {
40	memcpy((char ) &s_in->sin_addr, (char ) hp->h_addr_list[0],
41	sizeof(struct in_addr));
42	return 0;
43	}
44	/* Try the NETWORKS database to see if this is a known network. */
45	#ifdef DEBUG
46	bb_error_msg("getnetbyname (%s)", name);
47	#endif
48	if ((np = getnetbyname(name)) != (struct netent *) NULL) {
49	s_in->sin_addr.s_addr = htonl(np->n_net);
50	return 1;
51	}
52	if (hostfirst) {
53	/* Don't try again */
54	return -1;
55	}
56	#ifdef DEBUG
57	res_init();
58	_res.options \|= RES_DEBUG;
59	#endif
60
61	#ifdef DEBUG
62	bb_error_msg("gethostbyname (%s)", name);
63	#endif
64	if ((hp = gethostbyname(name)) == (struct hostent *) NULL) {
65	return -1;
66	}
67	memcpy((char ) &s_in->sin_addr, (char ) hp->h_addr_list[0],
68	sizeof(struct in_addr));
69
70	return 0;
71	}
72
73	/* cache */
74	struct addr {
75	struct sockaddr_in addr;
76	char *name;
77	int host;
78	struct addr *next;
79	};
80
81	static struct addr INET_nn = NULL; / addr-to-name cache */
82
83	/* numeric: & 0x8000: default instead of *,
84	* & 0x4000: host instead of net,
85	* & 0x0fff: don't resolve
86	*/
87	int INET_rresolve(char name, size_t len, struct sockaddr_in s_in,
88	int numeric, unsigned int netmask)
89	{
90	struct hostent *ent;
91	struct netent *np;
92	struct addr *pn;
93	unsigned long ad, host_ad;
94	int host = 0;
95
96	/* Grmpf. -FvK */
97	if (s_in->sin_family != AF_INET) {
98	#ifdef DEBUG
99	bb_error_msg("rresolve: unsupport address family %d !",
100	s_in->sin_family);
101	#endif
102	errno = EAFNOSUPPORT;
103	return -1;
104	}
105	ad = (unsigned long) s_in->sin_addr.s_addr;
106	#ifdef DEBUG
107	bb_error_msg("rresolve: %08lx, mask %08x, num %08x", ad, netmask, numeric);
108	#endif
109	if (ad == INADDR_ANY) {
110	if ((numeric & 0x0FFF) == 0) {
111	if (numeric & 0x8000)
112	safe_strncpy(name, bb_str_default, len);
113	else
114	safe_strncpy(name, "*", len);
115	return 0;
116	}
117	}
118	if (numeric & 0x0FFF) {
119	safe_strncpy(name, inet_ntoa(s_in->sin_addr), len);
120	return 0;
121	}
122
123	if ((ad & (~netmask)) != 0 \|\| (numeric & 0x4000))
124	host = 1;
125	pn = INET_nn;
126	while (pn != NULL) {
127	if (pn->addr.sin_addr.s_addr == ad && pn->host == host) {
128	safe_strncpy(name, pn->name, len);
129	#ifdef DEBUG
130	bb_error_msg("rresolve: found %s %08lx in cache",
131	(host ? "host" : "net"), ad);
132	#endif
133	return 0;
134	}
135	pn = pn->next;
136	}
137
138	host_ad = ntohl(ad);
139	np = NULL;
140	ent = NULL;
141	if (host) {
142	#ifdef DEBUG
143	bb_error_msg("gethostbyaddr (%08lx)", ad);
144	#endif
145	ent = gethostbyaddr((char *) &ad, 4, AF_INET);
146	if (ent != NULL) {
147	safe_strncpy(name, ent->h_name, len);
148	}
149	} else {
150	#ifdef DEBUG
151	bb_error_msg("getnetbyaddr (%08lx)", host_ad);
152	#endif
153	np = getnetbyaddr(host_ad, AF_INET);
154	if (np != NULL) {
155	safe_strncpy(name, np->n_name, len);
156	}
157	}
158	if ((ent == NULL) && (np == NULL)) {
159	safe_strncpy(name, inet_ntoa(s_in->sin_addr), len);
160	}
161	pn = xmalloc(sizeof(struct addr));
162	pn->addr = *s_in;
163	pn->next = INET_nn;
164	pn->host = host;
165	pn->name = xstrdup(name);
166	INET_nn = pn;
167
168	return 0;
169	}
170
171	#ifdef CONFIG_FEATURE_IPV6
172
173	int INET6_resolve(const char name, struct sockaddr_in6 sin6)
174	{
175	struct addrinfo req, *ai;
176	int s;
177
178	memset(&req, '\0', sizeof req);
179	req.ai_family = AF_INET6;
180	s = getaddrinfo(name, NULL, &req, &ai);
181	if (s) {
182	bb_error_msg("getaddrinfo: %s: %d", name, s);
183	return -1;
184	}
185	memcpy(sin6, ai->ai_addr, sizeof(struct sockaddr_in6));
186
187	freeaddrinfo(ai);
188
189	return 0;
190	}
191
192	#ifndef IN6_IS_ADDR_UNSPECIFIED
193	# define IN6_IS_ADDR_UNSPECIFIED(a) \
194	(((uint32_t ) (a))[0] == 0 && ((uint32_t ) (a))[1] == 0 && \
195	((uint32_t ) (a))[2] == 0 && ((uint32_t ) (a))[3] == 0)
196	#endif
197
198
199	int INET6_rresolve(char name, size_t len, struct sockaddr_in6 sin6,
200	int numeric)
201	{
202	int s;
203
204	/* Grmpf. -FvK */
205	if (sin6->sin6_family != AF_INET6) {
206	#ifdef DEBUG
207	bb_error_msg("rresolve: unsupport address family %d!",
208	sin6->sin6_family);
209	#endif
210	errno = EAFNOSUPPORT;
211	return -1;
212	}
213	if (numeric & 0x7FFF) {
214	inet_ntop(AF_INET6, &sin6->sin6_addr, name, len);
215	return 0;
216	}
217	if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
218	if (numeric & 0x8000) {
219	strcpy(name, bb_str_default);
220	} else {
221	name[0] = '*';
222	name[1] = '\0';
223	}
224	return 0;
225	}
226
227	s = getnameinfo((struct sockaddr *) sin6, sizeof(struct sockaddr_in6), name, len, NULL, 0, 0);
228	if (s) {
229	bb_error_msg("getnameinfo failed");
230	return -1;
231	}
232	return 0;
233	}
234
235	#endif /* CONFIG_FEATURE_IPV6 */