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
|
/* 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
*
* Licensed under GPLv2, see file LICENSE in this source tree.
*/
#include "libbb.h"
#include "inet_common.h"
int FAST_FUNC INET_resolve(const char *name, struct sockaddr_in *s_in, int hostfirst)
{
struct hostent *hp;
#if ENABLE_FEATURE_ETC_NETWORKS
struct netent *np;
#endif
/* Grmpf. -FvK */
s_in->sin_family = AF_INET;
s_in->sin_port = 0;
/* Default is special, meaning 0.0.0.0. */
if (strcmp(name, "default") == 0) {
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);
if (hp != NULL) {
memcpy(&s_in->sin_addr, hp->h_addr_list[0],
sizeof(struct in_addr));
return 0;
}
}
#if ENABLE_FEATURE_ETC_NETWORKS
/* Try the NETWORKS database to see if this is a known network. */
#ifdef DEBUG
bb_error_msg("getnetbyname(%s)", name);
#endif
np = getnetbyname(name);
if (np != NULL) {
s_in->sin_addr.s_addr = htonl(np->n_net);
return 1;
}
#endif
if (hostfirst) {
/* Don't try again */
return -1;
}
#ifdef DEBUG
res_init();
_res.options |= RES_DEBUG;
bb_error_msg("gethostbyname(%s)", name);
#endif
hp = gethostbyname(name);
if (hp == NULL) {
return -1;
}
memcpy(&s_in->sin_addr, hp->h_addr_list[0], sizeof(struct in_addr));
return 0;
}
/* numeric: & 0x8000: default instead of *,
* & 0x4000: host instead of net,
* & 0x0fff: don't resolve
*/
char* FAST_FUNC INET_rresolve(struct sockaddr_in *s_in, int numeric, uint32_t netmask)
{
/* addr-to-name cache */
struct addr {
struct addr *next;
struct sockaddr_in addr;
int host;
char name[1];
};
static struct addr *cache = NULL;
struct addr *pn;
char *name;
uint32_t ad, host_ad;
int host = 0;
if (s_in->sin_family != AF_INET) {
#ifdef DEBUG
bb_error_msg("rresolve: unsupported address family %d!",
s_in->sin_family);
#endif
errno = EAFNOSUPPORT;
return NULL;
}
ad = s_in->sin_addr.s_addr;
#ifdef DEBUG
bb_error_msg("rresolve: %08x, mask %08x, num %08x", (unsigned)ad, netmask, numeric);
#endif
if (ad == INADDR_ANY) {
if ((numeric & 0x0FFF) == 0) {
if (numeric & 0x8000)
return xstrdup("default");
return xstrdup("*");
}
}
if (numeric & 0x0FFF)
return xstrdup(inet_ntoa(s_in->sin_addr));
if ((ad & (~netmask)) != 0 || (numeric & 0x4000))
host = 1;
pn = cache;
while (pn) {
if (pn->addr.sin_addr.s_addr == ad && pn->host == host) {
#ifdef DEBUG
bb_error_msg("rresolve: found %s %08x in cache",
(host ? "host" : "net"), (unsigned)ad);
#endif
return xstrdup(pn->name);
}
pn = pn->next;
}
host_ad = ntohl(ad);
name = NULL;
if (host) {
struct hostent *ent;
#ifdef DEBUG
bb_error_msg("gethostbyaddr (%08x)", (unsigned)ad);
#endif
ent = gethostbyaddr((char *) &ad, 4, AF_INET);
if (ent)
name = xstrdup(ent->h_name);
} else if (ENABLE_FEATURE_ETC_NETWORKS) {
struct netent *np;
#ifdef DEBUG
bb_error_msg("getnetbyaddr (%08x)", (unsigned)host_ad);
#endif
np = getnetbyaddr(host_ad, AF_INET);
if (np)
name = xstrdup(np->n_name);
}
if (!name)
name = xstrdup(inet_ntoa(s_in->sin_addr));
pn = xmalloc(sizeof(*pn) + strlen(name)); /* no '+ 1', it's already accounted for */
pn->next = cache;
pn->addr = *s_in;
pn->host = host;
strcpy(pn->name, name);
cache = pn;
return name;
}
#if ENABLE_FEATURE_IPV6
int FAST_FUNC INET6_resolve(const char *name, struct sockaddr_in6 *sin6)
{
struct addrinfo req, *ai = NULL;
int s;
memset(&req, 0, sizeof(req));
req.ai_family = AF_INET6;
s = getaddrinfo(name, NULL, &req, &ai);
if (s != 0) {
bb_error_msg("getaddrinfo: %s: %d", name, s);
return -1;
}
memcpy(sin6, ai->ai_addr, sizeof(*sin6));
if (ai)
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
char* FAST_FUNC INET6_rresolve(struct sockaddr_in6 *sin6, int numeric)
{
char name[128];
int s;
if (sin6->sin6_family != AF_INET6) {
#ifdef DEBUG
bb_error_msg("rresolve: unsupported address family %d!",
sin6->sin6_family);
#endif
errno = EAFNOSUPPORT;
return NULL;
}
if (numeric & 0x7FFF) {
inet_ntop(AF_INET6, &sin6->sin6_addr, name, sizeof(name));
return xstrdup(name);
}
if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
if (numeric & 0x8000)
return xstrdup("default");
return xstrdup("*");
}
s = getnameinfo((struct sockaddr *) sin6, sizeof(*sin6),
name, sizeof(name),
/*serv,servlen:*/ NULL, 0,
0);
if (s != 0) {
bb_error_msg("getnameinfo failed");
return NULL;
}
return xstrdup(name);
}
#endif /* CONFIG_FEATURE_IPV6 */
|
