[1765] | 1 | /* vi: set sw=4 ts=4: */
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[821] | 2 | /*
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| 3 | * stolen from net-tools-1.59 and stripped down for busybox by
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| 4 | * Erik Andersen <andersen@codepoet.org>
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| 5 | *
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| 6 | * Heavily modified by Manuel Novoa III Mar 12, 2001
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| 7 | *
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[2725] | 8 | * Licensed under GPLv2, see file LICENSE in this source tree.
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[821] | 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 |
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[2725] | 14 | int FAST_FUNC INET_resolve(const char *name, struct sockaddr_in *s_in, int hostfirst)
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[821] | 15 | {
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| 16 | struct hostent *hp;
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[1765] | 17 | #if ENABLE_FEATURE_ETC_NETWORKS
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[821] | 18 | struct netent *np;
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[1765] | 19 | #endif
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[821] | 20 |
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| 21 | /* Grmpf. -FvK */
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| 22 | s_in->sin_family = AF_INET;
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| 23 | s_in->sin_port = 0;
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| 24 |
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| 25 | /* Default is special, meaning 0.0.0.0. */
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[2725] | 26 | if (strcmp(name, "default") == 0) {
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[821] | 27 | s_in->sin_addr.s_addr = INADDR_ANY;
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[1765] | 28 | return 1;
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[821] | 29 | }
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| 30 | /* Look to see if it's a dotted quad. */
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| 31 | if (inet_aton(name, &s_in->sin_addr)) {
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| 32 | return 0;
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| 33 | }
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| 34 | /* If we expect this to be a hostname, try hostname database first */
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[3621] | 35 | if (hostfirst) {
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[821] | 36 | #ifdef DEBUG
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[1765] | 37 | bb_error_msg("gethostbyname(%s)", name);
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[821] | 38 | #endif
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[1765] | 39 | hp = gethostbyname(name);
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[3621] | 40 | if (hp) {
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[1765] | 41 | memcpy(&s_in->sin_addr, hp->h_addr_list[0],
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| 42 | sizeof(struct in_addr));
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| 43 | return 0;
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| 44 | }
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[821] | 45 | }
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[1765] | 46 | #if ENABLE_FEATURE_ETC_NETWORKS
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[821] | 47 | /* Try the NETWORKS database to see if this is a known network. */
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| 48 | #ifdef DEBUG
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[1765] | 49 | bb_error_msg("getnetbyname(%s)", name);
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[821] | 50 | #endif
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[1765] | 51 | np = getnetbyname(name);
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[3621] | 52 | if (np) {
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[821] | 53 | s_in->sin_addr.s_addr = htonl(np->n_net);
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| 54 | return 1;
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| 55 | }
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[1765] | 56 | #endif
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[821] | 57 | if (hostfirst) {
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| 58 | /* Don't try again */
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| 59 | return -1;
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| 60 | }
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| 61 | #ifdef DEBUG
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| 62 | res_init();
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| 63 | _res.options |= RES_DEBUG;
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[1765] | 64 | bb_error_msg("gethostbyname(%s)", name);
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[821] | 65 | #endif
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[1765] | 66 | hp = gethostbyname(name);
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[3621] | 67 | if (!hp) {
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[821] | 68 | return -1;
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| 69 | }
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[1765] | 70 | memcpy(&s_in->sin_addr, hp->h_addr_list[0], sizeof(struct in_addr));
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[821] | 71 | return 0;
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| 72 | }
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| 73 |
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| 74 |
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[3621] | 75 | /* numeric: & 0x8000: "default" instead of "*",
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[821] | 76 | * & 0x4000: host instead of net,
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| 77 | * & 0x0fff: don't resolve
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| 78 | */
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[2725] | 79 | char* FAST_FUNC INET_rresolve(struct sockaddr_in *s_in, int numeric, uint32_t netmask)
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[821] | 80 | {
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[1765] | 81 | /* addr-to-name cache */
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| 82 | struct addr {
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| 83 | struct addr *next;
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[3621] | 84 | uint32_t nip;
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| 85 | smallint is_host;
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[1765] | 86 | char name[1];
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| 87 | };
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| 88 | static struct addr *cache = NULL;
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| 89 |
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[821] | 90 | struct addr *pn;
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[1765] | 91 | char *name;
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[3621] | 92 | uint32_t nip;
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| 93 | smallint is_host;
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[821] | 94 |
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| 95 | if (s_in->sin_family != AF_INET) {
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| 96 | #ifdef DEBUG
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[1765] | 97 | bb_error_msg("rresolve: unsupported address family %d!",
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[3232] | 98 | s_in->sin_family);
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[821] | 99 | #endif
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| 100 | errno = EAFNOSUPPORT;
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[1765] | 101 | return NULL;
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[821] | 102 | }
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[3621] | 103 | nip = s_in->sin_addr.s_addr;
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[821] | 104 | #ifdef DEBUG
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[3621] | 105 | bb_error_msg("rresolve: %08x mask:%08x num:%08x", (unsigned)nip, netmask, numeric);
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[821] | 106 | #endif
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[3621] | 107 | if (numeric & 0x0FFF)
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| 108 | return xmalloc_sockaddr2dotted_noport((void*)s_in);
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| 109 | if (nip == INADDR_ANY) {
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| 110 | if (numeric & 0x8000)
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| 111 | return xstrdup("default");
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| 112 | return xstrdup("*");
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[821] | 113 | }
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| 114 |
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[3621] | 115 | is_host = ((nip & (~netmask)) != 0 || (numeric & 0x4000));
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| 116 |
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[1765] | 117 | pn = cache;
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| 118 | while (pn) {
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[3621] | 119 | if (pn->nip == nip && pn->is_host == is_host) {
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[821] | 120 | #ifdef DEBUG
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[1765] | 121 | bb_error_msg("rresolve: found %s %08x in cache",
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[3621] | 122 | (is_host ? "host" : "net"), (unsigned)nip);
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[821] | 123 | #endif
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[1765] | 124 | return xstrdup(pn->name);
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[821] | 125 | }
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| 126 | pn = pn->next;
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| 127 | }
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| 128 |
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[1765] | 129 | name = NULL;
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[3621] | 130 | if (is_host) {
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[821] | 131 | #ifdef DEBUG
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[3621] | 132 | bb_error_msg("sockaddr2host_noport(%08x)", (unsigned)nip);
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[821] | 133 | #endif
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[3621] | 134 | name = xmalloc_sockaddr2host_noport((void*)s_in);
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[1765] | 135 | } else if (ENABLE_FEATURE_ETC_NETWORKS) {
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| 136 | struct netent *np;
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[821] | 137 | #ifdef DEBUG
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[3621] | 138 | bb_error_msg("getnetbyaddr(%08x)", (unsigned)ntohl(nip));
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[821] | 139 | #endif
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[3621] | 140 | np = getnetbyaddr(ntohl(nip), AF_INET);
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[1765] | 141 | if (np)
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| 142 | name = xstrdup(np->n_name);
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[821] | 143 | }
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[1765] | 144 | if (!name)
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[3621] | 145 | name = xmalloc_sockaddr2dotted_noport((void*)s_in);
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| 146 |
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[1765] | 147 | pn = xmalloc(sizeof(*pn) + strlen(name)); /* no '+ 1', it's already accounted for */
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| 148 | pn->next = cache;
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[3621] | 149 | pn->nip = nip;
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| 150 | pn->is_host = is_host;
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[1765] | 151 | strcpy(pn->name, name);
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| 152 | cache = pn;
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[3621] | 153 |
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[1765] | 154 | return name;
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[821] | 155 | }
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| 156 |
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[1765] | 157 | #if ENABLE_FEATURE_IPV6
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[821] | 158 |
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[2725] | 159 | int FAST_FUNC INET6_resolve(const char *name, struct sockaddr_in6 *sin6)
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[821] | 160 | {
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[3232] | 161 | struct addrinfo req, *ai = NULL;
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[821] | 162 | int s;
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| 163 |
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[3232] | 164 | memset(&req, 0, sizeof(req));
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[821] | 165 | req.ai_family = AF_INET6;
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[1765] | 166 | s = getaddrinfo(name, NULL, &req, &ai);
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[3232] | 167 | if (s != 0) {
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[821] | 168 | bb_error_msg("getaddrinfo: %s: %d", name, s);
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| 169 | return -1;
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| 170 | }
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[3232] | 171 | memcpy(sin6, ai->ai_addr, sizeof(*sin6));
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[3621] | 172 | freeaddrinfo(ai);
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[1765] | 173 | return 0;
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[821] | 174 | }
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| 175 |
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| 176 | #ifndef IN6_IS_ADDR_UNSPECIFIED
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| 177 | # define IN6_IS_ADDR_UNSPECIFIED(a) \
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| 178 | (((uint32_t *) (a))[0] == 0 && ((uint32_t *) (a))[1] == 0 && \
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| 179 | ((uint32_t *) (a))[2] == 0 && ((uint32_t *) (a))[3] == 0)
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| 180 | #endif
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| 181 |
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| 182 |
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[2725] | 183 | char* FAST_FUNC INET6_rresolve(struct sockaddr_in6 *sin6, int numeric)
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[821] | 184 | {
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| 185 | if (sin6->sin6_family != AF_INET6) {
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| 186 | #ifdef DEBUG
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[2725] | 187 | bb_error_msg("rresolve: unsupported address family %d!",
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[3232] | 188 | sin6->sin6_family);
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[821] | 189 | #endif
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| 190 | errno = EAFNOSUPPORT;
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[1765] | 191 | return NULL;
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[821] | 192 | }
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| 193 | if (numeric & 0x7FFF) {
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[3621] | 194 | return xmalloc_sockaddr2dotted_noport((void*)sin6);
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[821] | 195 | }
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| 196 | if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
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[1765] | 197 | if (numeric & 0x8000)
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[2725] | 198 | return xstrdup("default");
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[1765] | 199 | return xstrdup("*");
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[821] | 200 | }
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| 201 |
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[3621] | 202 | return xmalloc_sockaddr2host_noport((void*)sin6);
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[821] | 203 | }
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| 204 |
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[2725] | 205 | #endif /* CONFIG_FEATURE_IPV6 */
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