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authorEric Andersen <andersen@codepoet.org>2001-11-10 12:18:42 +0000
committerEric Andersen <andersen@codepoet.org>2001-11-10 12:18:42 +0000
commitc223ced0eab3d7b579b42c4626bb40686bd81c9a (patch)
tree870039993d700fe054484a2ea7b1bf24e3d467ae /libbb/inet_common.c
parent282671bf76bd7e3644b730673ca748947913b911 (diff)
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I forgot to add these. Part of the patch from vodz
Diffstat (limited to 'libbb/inet_common.c')
-rw-r--r--libbb/inet_common.c174
1 files changed, 174 insertions, 0 deletions
diff --git a/libbb/inet_common.c b/libbb/inet_common.c
new file mode 100644
index 000000000..0261d438a
--- /dev/null
+++ b/libbb/inet_common.c
@@ -0,0 +1,174 @@
1/*
2 * stolen from net-tools-1.59 and stripped down for busybox by
3 * Erik Andersen <andersee@debian.org>
4 *
5 * Heavily modified by Manuel Novoa III Mar 12, 2001
6 *
7 * Version: $Id: inet_common.c,v 1.1 2001/11/10 12:18:42 andersen Exp $
8 *
9 */
10
11#include "inet_common.h"
12#include <stdio.h>
13#include <errno.h>
14#include <stdlib.h>
15#include <string.h>
16#include <unistd.h>
17#include "libbb.h"
18
19const char bb_INET_default[]="default";
20
21int INET_resolve(const char *name, struct sockaddr_in *s_in, int hostfirst)
22{
23 struct hostent *hp;
24 struct netent *np;
25
26 /* Grmpf. -FvK */
27 s_in->sin_family = AF_INET;
28 s_in->sin_port = 0;
29
30 /* Default is special, meaning 0.0.0.0. */
31 if (!strcmp(name, bb_INET_default)) {
32 s_in->sin_addr.s_addr = INADDR_ANY;
33 return (1);
34 }
35 /* Look to see if it's a dotted quad. */
36 if (inet_aton(name, &s_in->sin_addr)) {
37 return 0;
38 }
39 /* If we expect this to be a hostname, try hostname database first */
40#ifdef DEBUG
41 if (hostfirst) fprintf (stderr, "gethostbyname (%s)\n", name);
42#endif
43 if (hostfirst &&
44 (hp = gethostbyname(name)) != (struct hostent *) NULL) {
45 memcpy((char *) &s_in->sin_addr, (char *) hp->h_addr_list[0],
46 sizeof(struct in_addr));
47 return 0;
48 }
49 /* Try the NETWORKS database to see if this is a known network. */
50#ifdef DEBUG
51 fprintf (stderr, "getnetbyname (%s)\n", name);
52#endif
53 if ((np = getnetbyname(name)) != (struct netent *) NULL) {
54 s_in->sin_addr.s_addr = htonl(np->n_net);
55 return 1;
56 }
57 if (hostfirst) {
58 /* Don't try again */
59 errno = h_errno;
60 return -1;
61 }
62#ifdef DEBUG
63 res_init();
64 _res.options |= RES_DEBUG;
65#endif
66
67#ifdef DEBUG
68 fprintf (stderr, "gethostbyname (%s)\n", name);
69#endif
70 if ((hp = gethostbyname(name)) == (struct hostent *) NULL) {
71 errno = h_errno;
72 return -1;
73 }
74 memcpy((char *) &s_in->sin_addr, (char *) hp->h_addr_list[0],
75 sizeof(struct in_addr));
76
77 return 0;
78}
79
80/* cache */
81struct addr {
82 struct sockaddr_in addr;
83 char *name;
84 int host;
85 struct addr *next;
86};
87
88static struct addr *INET_nn = NULL; /* addr-to-name cache */
89
90/* numeric: & 0x8000: default instead of *,
91 * & 0x4000: host instead of net,
92 * & 0x0fff: don't resolve
93 */
94int INET_rresolve(char *name, size_t len, struct sockaddr_in *s_in,
95 int numeric, unsigned int netmask)
96{
97 struct hostent *ent;
98 struct netent *np;
99 struct addr *pn;
100 unsigned long ad, host_ad;
101 int host = 0;
102
103 /* Grmpf. -FvK */
104 if (s_in->sin_family != AF_INET) {
105#ifdef DEBUG
106 fprintf(stderr, _("rresolve: unsupport address family %d !\n"), s_in->sin_family);
107#endif
108 errno = EAFNOSUPPORT;
109 return (-1);
110 }
111 ad = (unsigned long) s_in->sin_addr.s_addr;
112#ifdef DEBUG
113 fprintf (stderr, "rresolve: %08lx, mask %08x, num %08x \n", ad, netmask, numeric);
114#endif
115 if (ad == INADDR_ANY) {
116 if ((numeric & 0x0FFF) == 0) {
117 if (numeric & 0x8000)
118 safe_strncpy(name, bb_INET_default, len);
119 else
120 safe_strncpy(name, "*", len);
121 return (0);
122 }
123 }
124 if (numeric & 0x0FFF) {
125 safe_strncpy(name, inet_ntoa(s_in->sin_addr), len);
126 return (0);
127 }
128
129 if ((ad & (~netmask)) != 0 || (numeric & 0x4000))
130 host = 1;
131#if 0
132 INET_nn = NULL;
133#endif
134 pn = INET_nn;
135 while (pn != NULL) {
136 if (pn->addr.sin_addr.s_addr == ad && pn->host == host) {
137 safe_strncpy(name, pn->name, len);
138#ifdef DEBUG
139 fprintf (stderr, "rresolve: found %s %08lx in cache\n", (host? "host": "net"), ad);
140#endif
141 return (0);
142 }
143 pn = pn->next;
144 }
145
146 host_ad = ntohl(ad);
147 np = NULL;
148 ent = NULL;
149 if (host) {
150#ifdef DEBUG
151 fprintf (stderr, "gethostbyaddr (%08lx)\n", ad);
152#endif
153 ent = gethostbyaddr((char *) &ad, 4, AF_INET);
154 if (ent != NULL)
155 safe_strncpy(name, ent->h_name, len);
156 } else {
157#ifdef DEBUG
158 fprintf (stderr, "getnetbyaddr (%08lx)\n", host_ad);
159#endif
160 np = getnetbyaddr(host_ad, AF_INET);
161 if (np != NULL)
162 safe_strncpy(name, np->n_name, len);
163 }
164 if ((ent == NULL) && (np == NULL))
165 safe_strncpy(name, inet_ntoa(s_in->sin_addr), len);
166 pn = (struct addr *) xmalloc(sizeof(struct addr));
167 pn->addr = *s_in;
168 pn->next = INET_nn;
169 pn->host = host;
170 pn->name = xstrdup(name);
171 INET_nn = pn;
172
173 return (0);
174}
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