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12#include "libbb.h"
13#include "utils.h"
14#include "inet_common.h"
15
16unsigned get_unsigned(char *arg, const char *errmsg)
17{
18 unsigned long res;
19 char *ptr;
20
21 if (*arg) {
22 res = strtoul(arg, &ptr, 0);
23
24 if (!*ptr && res <= UINT_MAX) {
25 return res;
26 }
27 }
28 invarg(arg, errmsg);
29}
30
31uint32_t get_u32(char *arg, const char *errmsg)
32{
33 unsigned long res;
34 char *ptr;
35
36 if (*arg) {
37 res = strtoul(arg, &ptr, 0);
38
39 if (!*ptr && res <= 0xFFFFFFFFUL) {
40 return res;
41 }
42 }
43 invarg(arg, errmsg);
44}
45
46uint16_t get_u16(char *arg, const char *errmsg)
47{
48 unsigned long res;
49 char *ptr;
50
51 if (*arg) {
52 res = strtoul(arg, &ptr, 0);
53
54 if (!*ptr && res <= 0xFFFF) {
55 return res;
56 }
57 }
58 invarg(arg, errmsg);
59}
60
61int get_addr_1(inet_prefix *addr, char *name, int family)
62{
63 memset(addr, 0, sizeof(*addr));
64
65 if (strcmp(name, "default") == 0
66 || strcmp(name, "all") == 0
67 || strcmp(name, "any") == 0
68 ) {
69 addr->family = family;
70 addr->bytelen = (family == AF_INET6 ? 16 : 4);
71 addr->bitlen = -1;
72 return 0;
73 }
74
75 if (strchr(name, ':')) {
76 addr->family = AF_INET6;
77 if (family != AF_UNSPEC && family != AF_INET6)
78 return -1;
79 if (inet_pton(AF_INET6, name, addr->data) <= 0)
80 return -1;
81 addr->bytelen = 16;
82 addr->bitlen = -1;
83 return 0;
84 }
85
86 if (family != AF_UNSPEC && family != AF_INET)
87 return -1;
88
89
90 addr->family = AF_INET;
91#if 0
92 if (inet_pton(AF_INET, name, addr->data) <= 0)
93 return -1;
94#else
95 {
96 unsigned i = 0;
97 unsigned n = 0;
98 const char *cp = name - 1;
99 while (*++cp) {
100 if ((unsigned char)(*cp - '0') <= 9) {
101 n = 10 * n + (unsigned char)(*cp - '0');
102 if (n >= 256)
103 return -1;
104 ((uint8_t*)addr->data)[i] = n;
105 continue;
106 }
107 if (*cp == '.' && ++i <= 3) {
108 n = 0;
109 continue;
110 }
111 return -1;
112 }
113 }
114#endif
115 addr->bytelen = 4;
116 addr->bitlen = -1;
117
118 return 0;
119}
120
121static void get_prefix_1(inet_prefix *dst, char *arg, int family)
122{
123 char *slash;
124
125 memset(dst, 0, sizeof(*dst));
126
127 if (strcmp(arg, "default") == 0
128 || strcmp(arg, "all") == 0
129 || strcmp(arg, "any") == 0
130 ) {
131 dst->family = family;
132
133
134 return;
135 }
136
137 slash = strchr(arg, '/');
138 if (slash)
139 *slash = '\0';
140
141 if (get_addr_1(dst, arg, family) == 0) {
142 dst->bitlen = (dst->family == AF_INET6) ? 128 : 32;
143 if (slash) {
144 unsigned plen;
145 inet_prefix netmask_pfx;
146
147 netmask_pfx.family = AF_UNSPEC;
148 plen = bb_strtou(slash + 1, NULL, 0);
149 if ((errno || plen > dst->bitlen)
150 && get_addr_1(&netmask_pfx, slash + 1, family) != 0
151 ) {
152 goto bad;
153 }
154 if (netmask_pfx.family == AF_INET) {
155
156 uint32_t mask = ntohl(netmask_pfx.data[0]);
157 uint32_t host = ~mask;
158
159
160 if (host & (host + 1))
161 goto bad;
162
163 for (plen = 0; mask; mask <<= 1)
164 ++plen;
165 if (plen > dst->bitlen)
166 goto bad;
167
168 }
169 dst->bitlen = plen;
170 }
171 }
172
173 if (slash)
174 *slash = '/';
175 return;
176 bad:
177 bb_error_msg_and_die("an %s %s is expected rather than \"%s\"", "inet", "prefix", arg);
178}
179
180int get_addr(inet_prefix *dst, char *arg, int family)
181{
182 if (family == AF_PACKET) {
183 bb_error_msg_and_die("\"%s\" may be inet %s, but it is not allowed in this context", arg, "address");
184 }
185 if (get_addr_1(dst, arg, family)) {
186 bb_error_msg_and_die("an %s %s is expected rather than \"%s\"", "inet", "address", arg);
187 }
188 return 0;
189}
190
191void get_prefix(inet_prefix *dst, char *arg, int family)
192{
193 if (family == AF_PACKET) {
194 bb_error_msg_and_die("\"%s\" may be inet %s, but it is not allowed in this context", arg, "prefix");
195 }
196 get_prefix_1(dst, arg, family);
197}
198
199uint32_t get_addr32(char *name)
200{
201 inet_prefix addr;
202
203 if (get_addr_1(&addr, name, AF_INET)) {
204 bb_error_msg_and_die("an %s %s is expected rather than \"%s\"", "IP", "address", name);
205 }
206 return addr.data[0];
207}
208
209void incomplete_command(void)
210{
211 bb_error_msg_and_die("command line is not complete, try option \"help\"");
212}
213
214void invarg(const char *arg, const char *opt)
215{
216 bb_error_msg_and_die(bb_msg_invalid_arg, arg, opt);
217}
218
219void duparg(const char *key, const char *arg)
220{
221 bb_error_msg_and_die("duplicate \"%s\": \"%s\" is the second value", key, arg);
222}
223
224void duparg2(const char *key, const char *arg)
225{
226 bb_error_msg_and_die("either \"%s\" is duplicate, or \"%s\" is garbage", key, arg);
227}
228
229int inet_addr_match(const inet_prefix *a, const inet_prefix *b, int bits)
230{
231 const uint32_t *a1 = a->data;
232 const uint32_t *a2 = b->data;
233 int words = bits >> 5;
234
235 bits &= 0x1f;
236
237 if (words)
238 if (memcmp(a1, a2, words << 2))
239 return -1;
240
241 if (bits) {
242 uint32_t w1, w2;
243 uint32_t mask;
244
245 w1 = a1[words];
246 w2 = a2[words];
247
248 mask = htonl((0xffffffff) << (0x20 - bits));
249
250 if ((w1 ^ w2) & mask)
251 return 1;
252 }
253
254 return 0;
255}
256
257const char *rt_addr_n2a(int af,
258 void *addr, char *buf, int buflen)
259{
260 switch (af) {
261 case AF_INET:
262 case AF_INET6:
263 return inet_ntop(af, addr, buf, buflen);
264 default:
265 return "???";
266 }
267}
268
269#ifdef RESOLVE_HOSTNAMES
270const char *format_host(int af, int len, void *addr, char *buf, int buflen)
271{
272 if (resolve_hosts) {
273 struct hostent *h_ent;
274
275 if (len <= 0) {
276 switch (af) {
277 case AF_INET:
278 len = 4;
279 break;
280 case AF_INET6:
281 len = 16;
282 break;
283 default:;
284 }
285 }
286 if (len > 0) {
287 h_ent = gethostbyaddr(addr, len, af);
288 if (h_ent != NULL) {
289 safe_strncpy(buf, h_ent->h_name, buflen);
290 return buf;
291 }
292 }
293 }
294 return rt_addr_n2a(af, addr, buf, buflen);
295}
296#endif
297
