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11#include "libbb.h"
12#include "inet_common.h"
13
14int FAST_FUNC INET_resolve(const char *name, struct sockaddr_in *s_in, int hostfirst)
15{
16 struct hostent *hp;
17#if ENABLE_FEATURE_ETC_NETWORKS
18 struct netent *np;
19#endif
20
21
22 s_in->sin_family = AF_INET;
23 s_in->sin_port = 0;
24
25
26 if (strcmp(name, "default") == 0) {
27 s_in->sin_addr.s_addr = INADDR_ANY;
28 return 1;
29 }
30
31 if (inet_aton(name, &s_in->sin_addr)) {
32 return 0;
33 }
34
35#ifdef DEBUG
36 if (hostfirst) {
37 bb_error_msg("gethostbyname(%s)", name);
38 }
39#endif
40 if (hostfirst) {
41 hp = gethostbyname(name);
42 if (hp != NULL) {
43 memcpy(&s_in->sin_addr, hp->h_addr_list[0],
44 sizeof(struct in_addr));
45 return 0;
46 }
47 }
48#if ENABLE_FEATURE_ETC_NETWORKS
49
50#ifdef DEBUG
51 bb_error_msg("getnetbyname(%s)", name);
52#endif
53 np = getnetbyname(name);
54 if (np != NULL) {
55 s_in->sin_addr.s_addr = htonl(np->n_net);
56 return 1;
57 }
58#endif
59 if (hostfirst) {
60
61 return -1;
62 }
63#ifdef DEBUG
64 res_init();
65 _res.options |= RES_DEBUG;
66 bb_error_msg("gethostbyname(%s)", name);
67#endif
68 hp = gethostbyname(name);
69 if (hp == NULL) {
70 return -1;
71 }
72 memcpy(&s_in->sin_addr, hp->h_addr_list[0], sizeof(struct in_addr));
73 return 0;
74}
75
76
77
78
79
80
81char* FAST_FUNC INET_rresolve(struct sockaddr_in *s_in, int numeric, uint32_t netmask)
82{
83
84 struct addr {
85 struct addr *next;
86 struct sockaddr_in addr;
87 int host;
88 char name[1];
89 };
90 static struct addr *cache = NULL;
91
92 struct addr *pn;
93 char *name;
94 uint32_t ad, host_ad;
95 int host = 0;
96
97 if (s_in->sin_family != AF_INET) {
98#ifdef DEBUG
99 bb_error_msg("rresolve: unsupported address family %d!",
100 s_in->sin_family);
101#endif
102 errno = EAFNOSUPPORT;
103 return NULL;
104 }
105 ad = s_in->sin_addr.s_addr;
106#ifdef DEBUG
107 bb_error_msg("rresolve: %08x, mask %08x, num %08x", (unsigned)ad, netmask, numeric);
108#endif
109 if (ad == INADDR_ANY) {
110 if ((numeric & 0x0FFF) == 0) {
111 if (numeric & 0x8000)
112 return xstrdup("default");
113 return xstrdup("*");
114 }
115 }
116 if (numeric & 0x0FFF)
117 return xstrdup(inet_ntoa(s_in->sin_addr));
118
119 if ((ad & (~netmask)) != 0 || (numeric & 0x4000))
120 host = 1;
121 pn = cache;
122 while (pn) {
123 if (pn->addr.sin_addr.s_addr == ad && pn->host == host) {
124#ifdef DEBUG
125 bb_error_msg("rresolve: found %s %08x in cache",
126 (host ? "host" : "net"), (unsigned)ad);
127#endif
128 return xstrdup(pn->name);
129 }
130 pn = pn->next;
131 }
132
133 host_ad = ntohl(ad);
134 name = NULL;
135 if (host) {
136 struct hostent *ent;
137#ifdef DEBUG
138 bb_error_msg("gethostbyaddr (%08x)", (unsigned)ad);
139#endif
140 ent = gethostbyaddr((char *) &ad, 4, AF_INET);
141 if (ent)
142 name = xstrdup(ent->h_name);
143 } else if (ENABLE_FEATURE_ETC_NETWORKS) {
144 struct netent *np;
145#ifdef DEBUG
146 bb_error_msg("getnetbyaddr (%08x)", (unsigned)host_ad);
147#endif
148 np = getnetbyaddr(host_ad, AF_INET);
149 if (np)
150 name = xstrdup(np->n_name);
151 }
152 if (!name)
153 name = xstrdup(inet_ntoa(s_in->sin_addr));
154 pn = xmalloc(sizeof(*pn) + strlen(name));
155 pn->next = cache;
156 pn->addr = *s_in;
157 pn->host = host;
158 strcpy(pn->name, name);
159 cache = pn;
160 return name;
161}
162
163#if ENABLE_FEATURE_IPV6
164
165int FAST_FUNC INET6_resolve(const char *name, struct sockaddr_in6 *sin6)
166{
167 struct addrinfo req, *ai;
168 int s;
169
170 memset(&req, '\0', sizeof req);
171 req.ai_family = AF_INET6;
172 s = getaddrinfo(name, NULL, &req, &ai);
173 if (s) {
174 bb_error_msg("getaddrinfo: %s: %d", name, s);
175 return -1;
176 }
177 memcpy(sin6, ai->ai_addr, sizeof(struct sockaddr_in6));
178 freeaddrinfo(ai);
179 return 0;
180}
181
182#ifndef IN6_IS_ADDR_UNSPECIFIED
183# define IN6_IS_ADDR_UNSPECIFIED(a) \
184 (((uint32_t *) (a))[0] == 0 && ((uint32_t *) (a))[1] == 0 && \
185 ((uint32_t *) (a))[2] == 0 && ((uint32_t *) (a))[3] == 0)
186#endif
187
188
189char* FAST_FUNC INET6_rresolve(struct sockaddr_in6 *sin6, int numeric)
190{
191 char name[128];
192 int s;
193
194 if (sin6->sin6_family != AF_INET6) {
195#ifdef DEBUG
196 bb_error_msg("rresolve: unsupported address family %d!",
197 sin6->sin6_family);
198#endif
199 errno = EAFNOSUPPORT;
200 return NULL;
201 }
202 if (numeric & 0x7FFF) {
203 inet_ntop(AF_INET6, &sin6->sin6_addr, name, sizeof(name));
204 return xstrdup(name);
205 }
206 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
207 if (numeric & 0x8000)
208 return xstrdup("default");
209 return xstrdup("*");
210 }
211
212 s = getnameinfo((struct sockaddr *) sin6, sizeof(struct sockaddr_in6),
213 name, sizeof(name), NULL, 0, 0);
214 if (s) {
215 bb_error_msg("getnameinfo failed");
216 return NULL;
217 }
218 return xstrdup(name);
219}
220
221#endif
222
