[821] | 1 | /*
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| 2 | * stolen from net-tools-1.59 and stripped down for busybox by
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| 3 | * Erik Andersen <andersen@codepoet.org>
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| 4 | *
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| 5 | * Heavily modified by Manuel Novoa III Mar 12, 2001
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| 6 | *
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| 7 | * Version: $Id: inet_common.c,v 1.8 2004/03/10 07:42:38 mjn3 Exp $
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| 8 | *
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| 9 | */
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| 10 |
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| 11 | #include "libbb.h"
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| 12 | #include "inet_common.h"
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| 13 | #include <stdio.h>
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| 14 | #include <errno.h>
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| 15 | #include <stdlib.h>
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| 16 | #include <string.h>
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| 17 | #include <unistd.h>
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| 18 |
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| 19 | #ifdef DEBUG
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| 20 | # include <resolv.h>
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| 21 | #endif
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| 22 |
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| 23 |
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| 24 | const char bb_INET_default[] = "default";
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| 25 |
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| 26 | int INET_resolve(const char *name, struct sockaddr_in *s_in, int hostfirst)
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| 27 | {
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| 28 | struct hostent *hp;
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| 29 | struct netent *np;
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| 30 |
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| 31 | /* Grmpf. -FvK */
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| 32 | s_in->sin_family = AF_INET;
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| 33 | s_in->sin_port = 0;
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| 34 |
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| 35 | /* Default is special, meaning 0.0.0.0. */
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| 36 | if (!strcmp(name, bb_INET_default)) {
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| 37 | s_in->sin_addr.s_addr = INADDR_ANY;
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| 38 | return (1);
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| 39 | }
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| 40 | /* Look to see if it's a dotted quad. */
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| 41 | if (inet_aton(name, &s_in->sin_addr)) {
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| 42 | return 0;
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| 43 | }
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| 44 | /* If we expect this to be a hostname, try hostname database first */
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| 45 | #ifdef DEBUG
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| 46 | if (hostfirst) {
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| 47 | bb_error_msg("gethostbyname (%s)", name);
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| 48 | }
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| 49 | #endif
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| 50 | if (hostfirst && (hp = gethostbyname(name)) != (struct hostent *) NULL) {
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| 51 | memcpy((char *) &s_in->sin_addr, (char *) hp->h_addr_list[0],
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| 52 | sizeof(struct in_addr));
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| 53 | return 0;
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| 54 | }
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| 55 | /* Try the NETWORKS database to see if this is a known network. */
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| 56 | #ifdef DEBUG
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| 57 | bb_error_msg("getnetbyname (%s)", name);
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| 58 | #endif
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| 59 | if ((np = getnetbyname(name)) != (struct netent *) NULL) {
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| 60 | s_in->sin_addr.s_addr = htonl(np->n_net);
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| 61 | return 1;
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| 62 | }
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| 63 | if (hostfirst) {
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| 64 | /* Don't try again */
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| 65 | return -1;
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| 66 | }
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| 67 | #ifdef DEBUG
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| 68 | res_init();
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| 69 | _res.options |= RES_DEBUG;
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| 70 | #endif
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| 71 |
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| 72 | #ifdef DEBUG
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| 73 | bb_error_msg("gethostbyname (%s)", name);
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| 74 | #endif
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| 75 | if ((hp = gethostbyname(name)) == (struct hostent *) NULL) {
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| 76 | return -1;
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| 77 | }
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| 78 | memcpy((char *) &s_in->sin_addr, (char *) hp->h_addr_list[0],
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| 79 | sizeof(struct in_addr));
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| 80 |
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| 81 | return 0;
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| 82 | }
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| 83 |
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| 84 | /* cache */
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| 85 | struct addr {
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| 86 | struct sockaddr_in addr;
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| 87 | char *name;
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| 88 | int host;
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| 89 | struct addr *next;
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| 90 | };
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| 91 |
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| 92 | static struct addr *INET_nn = NULL; /* addr-to-name cache */
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| 93 |
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| 94 | /* numeric: & 0x8000: default instead of *,
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| 95 | * & 0x4000: host instead of net,
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| 96 | * & 0x0fff: don't resolve
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| 97 | */
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| 98 | int INET_rresolve(char *name, size_t len, struct sockaddr_in *s_in,
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| 99 | int numeric, unsigned int netmask)
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| 100 | {
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| 101 | struct hostent *ent;
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| 102 | struct netent *np;
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| 103 | struct addr *pn;
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| 104 | unsigned long ad, host_ad;
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| 105 | int host = 0;
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| 106 |
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| 107 | /* Grmpf. -FvK */
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| 108 | if (s_in->sin_family != AF_INET) {
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| 109 | #ifdef DEBUG
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| 110 | bb_error_msg("rresolve: unsupport address family %d !",
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| 111 | s_in->sin_family);
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| 112 | #endif
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| 113 | errno = EAFNOSUPPORT;
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| 114 | return (-1);
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| 115 | }
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| 116 | ad = (unsigned long) s_in->sin_addr.s_addr;
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| 117 | #ifdef DEBUG
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| 118 | bb_error_msg("rresolve: %08lx, mask %08x, num %08x", ad, netmask, numeric);
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| 119 | #endif
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| 120 | if (ad == INADDR_ANY) {
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| 121 | if ((numeric & 0x0FFF) == 0) {
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| 122 | if (numeric & 0x8000)
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| 123 | safe_strncpy(name, bb_INET_default, len);
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| 124 | else
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| 125 | safe_strncpy(name, "*", len);
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| 126 | return (0);
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| 127 | }
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| 128 | }
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| 129 | if (numeric & 0x0FFF) {
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| 130 | safe_strncpy(name, inet_ntoa(s_in->sin_addr), len);
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| 131 | return (0);
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| 132 | }
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| 133 |
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| 134 | if ((ad & (~netmask)) != 0 || (numeric & 0x4000))
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| 135 | host = 1;
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| 136 | #if 0
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| 137 | INET_nn = NULL;
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| 138 | #endif
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| 139 | pn = INET_nn;
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| 140 | while (pn != NULL) {
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| 141 | if (pn->addr.sin_addr.s_addr == ad && pn->host == host) {
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| 142 | safe_strncpy(name, pn->name, len);
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| 143 | #ifdef DEBUG
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| 144 | bb_error_msg("rresolve: found %s %08lx in cache",
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| 145 | (host ? "host" : "net"), ad);
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| 146 | #endif
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| 147 | return (0);
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| 148 | }
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| 149 | pn = pn->next;
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| 150 | }
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| 151 |
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| 152 | host_ad = ntohl(ad);
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| 153 | np = NULL;
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| 154 | ent = NULL;
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| 155 | if (host) {
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| 156 | #ifdef DEBUG
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| 157 | bb_error_msg("gethostbyaddr (%08lx)", ad);
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| 158 | #endif
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| 159 | ent = gethostbyaddr((char *) &ad, 4, AF_INET);
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| 160 | if (ent != NULL) {
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| 161 | safe_strncpy(name, ent->h_name, len);
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| 162 | }
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| 163 | } else {
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| 164 | #ifdef DEBUG
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| 165 | bb_error_msg("getnetbyaddr (%08lx)", host_ad);
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| 166 | #endif
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| 167 | np = getnetbyaddr(host_ad, AF_INET);
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| 168 | if (np != NULL) {
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| 169 | safe_strncpy(name, np->n_name, len);
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| 170 | }
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| 171 | }
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| 172 | if ((ent == NULL) && (np == NULL)) {
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| 173 | safe_strncpy(name, inet_ntoa(s_in->sin_addr), len);
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| 174 | }
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| 175 | pn = (struct addr *) xmalloc(sizeof(struct addr));
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| 176 | pn->addr = *s_in;
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| 177 | pn->next = INET_nn;
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| 178 | pn->host = host;
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| 179 | pn->name = bb_xstrdup(name);
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| 180 | INET_nn = pn;
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| 181 |
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| 182 | return (0);
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| 183 | }
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| 184 |
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| 185 | #ifdef CONFIG_FEATURE_IPV6
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| 186 |
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| 187 | int INET6_resolve(const char *name, struct sockaddr_in6 *sin6)
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| 188 | {
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| 189 | struct addrinfo req, *ai;
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| 190 | int s;
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| 191 |
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| 192 | memset(&req, '\0', sizeof req);
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| 193 | req.ai_family = AF_INET6;
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| 194 | if ((s = getaddrinfo(name, NULL, &req, &ai))) {
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| 195 | bb_error_msg("getaddrinfo: %s: %d", name, s);
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| 196 | return -1;
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| 197 | }
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| 198 | memcpy(sin6, ai->ai_addr, sizeof(struct sockaddr_in6));
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| 199 |
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| 200 | freeaddrinfo(ai);
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| 201 |
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| 202 | return (0);
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| 203 | }
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| 204 |
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| 205 | #ifndef IN6_IS_ADDR_UNSPECIFIED
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| 206 | # define IN6_IS_ADDR_UNSPECIFIED(a) \
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| 207 | (((uint32_t *) (a))[0] == 0 && ((uint32_t *) (a))[1] == 0 && \
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| 208 | ((uint32_t *) (a))[2] == 0 && ((uint32_t *) (a))[3] == 0)
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| 209 | #endif
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| 210 |
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| 211 |
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| 212 | int INET6_rresolve(char *name, size_t len, struct sockaddr_in6 *sin6,
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| 213 | int numeric)
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| 214 | {
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| 215 | int s;
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| 216 |
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| 217 | /* Grmpf. -FvK */
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| 218 | if (sin6->sin6_family != AF_INET6) {
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| 219 | #ifdef DEBUG
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| 220 | bb_error_msg(_("rresolve: unsupport address family %d !\n"),
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| 221 | sin6->sin6_family);
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| 222 | #endif
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| 223 | errno = EAFNOSUPPORT;
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| 224 | return (-1);
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| 225 | }
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| 226 | if (numeric & 0x7FFF) {
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| 227 | inet_ntop(AF_INET6, &sin6->sin6_addr, name, len);
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| 228 | return (0);
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| 229 | }
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| 230 | if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
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| 231 | if (numeric & 0x8000) {
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| 232 | strcpy(name, "default");
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| 233 | } else {
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| 234 | strcpy(name, "*");
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| 235 | }
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| 236 | return (0);
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| 237 | }
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| 238 |
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| 239 | s = getnameinfo((struct sockaddr *) sin6, sizeof(struct sockaddr_in6), name, len, NULL, 0, 0);
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| 240 | if (s) {
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| 241 | bb_error_msg("getnameinfo failed");
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| 242 | return -1;
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| 243 | }
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| 244 | return (0);
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| 245 | }
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| 246 |
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| 247 | #endif /* CONFIG_FEATURE_IPV6 */
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