[1770] | 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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| 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 |
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| 14 | int INET_resolve(const char *name, struct sockaddr_in *s_in, int hostfirst)
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| 15 | {
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| 16 | struct hostent *hp;
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[1770] | 17 | #if ENABLE_FEATURE_ETC_NETWORKS
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[821] | 18 | struct netent *np;
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[1770] | 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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[1770] | 26 | if (!strcmp(name, bb_str_default)) {
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[821] | 27 | s_in->sin_addr.s_addr = INADDR_ANY;
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[1770] | 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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| 35 | #ifdef DEBUG
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| 36 | if (hostfirst) {
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[1770] | 37 | bb_error_msg("gethostbyname(%s)", name);
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[821] | 38 | }
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| 39 | #endif
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[1770] | 40 | if (hostfirst) {
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| 41 | hp = gethostbyname(name);
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| 42 | if (hp != NULL) {
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| 43 | memcpy(&s_in->sin_addr, hp->h_addr_list[0],
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| 44 | sizeof(struct in_addr));
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| 45 | return 0;
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| 46 | }
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[821] | 47 | }
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[1770] | 48 | #if ENABLE_FEATURE_ETC_NETWORKS
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[821] | 49 | /* Try the NETWORKS database to see if this is a known network. */
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| 50 | #ifdef DEBUG
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[1770] | 51 | bb_error_msg("getnetbyname(%s)", name);
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[821] | 52 | #endif
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[1770] | 53 | np = getnetbyname(name);
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| 54 | if (np != NULL) {
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[821] | 55 | s_in->sin_addr.s_addr = htonl(np->n_net);
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| 56 | return 1;
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| 57 | }
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[1770] | 58 | #endif
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[821] | 59 | if (hostfirst) {
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| 60 | /* Don't try again */
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| 61 | return -1;
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| 62 | }
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| 63 | #ifdef DEBUG
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| 64 | res_init();
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| 65 | _res.options |= RES_DEBUG;
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| 66 | #endif
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| 67 |
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| 68 | #ifdef DEBUG
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[1770] | 69 | bb_error_msg("gethostbyname(%s)", name);
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[821] | 70 | #endif
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[1770] | 71 | hp = gethostbyname(name);
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| 72 | if (hp == NULL) {
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[821] | 73 | return -1;
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| 74 | }
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[1770] | 75 | memcpy(&s_in->sin_addr, hp->h_addr_list[0], sizeof(struct in_addr));
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[821] | 76 | return 0;
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| 77 | }
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| 78 |
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| 79 |
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| 80 | /* numeric: & 0x8000: default instead of *,
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| 81 | * & 0x4000: host instead of net,
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| 82 | * & 0x0fff: don't resolve
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| 83 | */
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[1770] | 84 | char *INET_rresolve(struct sockaddr_in *s_in, int numeric, uint32_t netmask)
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[821] | 85 | {
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[1770] | 86 | /* addr-to-name cache */
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| 87 | struct addr {
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| 88 | struct addr *next;
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| 89 | struct sockaddr_in addr;
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| 90 | int host;
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| 91 | char name[1];
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| 92 | };
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| 93 | static struct addr *cache = NULL;
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| 94 |
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[821] | 95 | struct addr *pn;
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[1770] | 96 | char *name;
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| 97 | uint32_t ad, host_ad;
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[821] | 98 | int host = 0;
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| 99 |
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| 100 | /* Grmpf. -FvK */
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| 101 | if (s_in->sin_family != AF_INET) {
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| 102 | #ifdef DEBUG
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[1770] | 103 | bb_error_msg("rresolve: unsupported address family %d!",
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[821] | 104 | s_in->sin_family);
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| 105 | #endif
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| 106 | errno = EAFNOSUPPORT;
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[1770] | 107 | return NULL;
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[821] | 108 | }
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[1770] | 109 | ad = s_in->sin_addr.s_addr;
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[821] | 110 | #ifdef DEBUG
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[1770] | 111 | bb_error_msg("rresolve: %08x, mask %08x, num %08x", (unsigned)ad, netmask, numeric);
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[821] | 112 | #endif
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| 113 | if (ad == INADDR_ANY) {
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| 114 | if ((numeric & 0x0FFF) == 0) {
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| 115 | if (numeric & 0x8000)
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[1770] | 116 | return xstrdup(bb_str_default);
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| 117 | return xstrdup("*");
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[821] | 118 | }
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| 119 | }
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[1770] | 120 | if (numeric & 0x0FFF)
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| 121 | return xstrdup(inet_ntoa(s_in->sin_addr));
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[821] | 122 |
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| 123 | if ((ad & (~netmask)) != 0 || (numeric & 0x4000))
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| 124 | host = 1;
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[1770] | 125 | pn = cache;
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| 126 | while (pn) {
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[821] | 127 | if (pn->addr.sin_addr.s_addr == ad && pn->host == host) {
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| 128 | #ifdef DEBUG
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[1770] | 129 | bb_error_msg("rresolve: found %s %08x in cache",
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| 130 | (host ? "host" : "net"), (unsigned)ad);
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[821] | 131 | #endif
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[1770] | 132 | return xstrdup(pn->name);
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[821] | 133 | }
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| 134 | pn = pn->next;
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| 135 | }
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| 136 |
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| 137 | host_ad = ntohl(ad);
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[1770] | 138 | name = NULL;
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[821] | 139 | if (host) {
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[1770] | 140 | struct hostent *ent;
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[821] | 141 | #ifdef DEBUG
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[1770] | 142 | bb_error_msg("gethostbyaddr (%08x)", (unsigned)ad);
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[821] | 143 | #endif
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| 144 | ent = gethostbyaddr((char *) &ad, 4, AF_INET);
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[1770] | 145 | if (ent)
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| 146 | name = xstrdup(ent->h_name);
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| 147 | } else if (ENABLE_FEATURE_ETC_NETWORKS) {
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| 148 | struct netent *np;
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[821] | 149 | #ifdef DEBUG
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[1770] | 150 | bb_error_msg("getnetbyaddr (%08x)", (unsigned)host_ad);
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[821] | 151 | #endif
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| 152 | np = getnetbyaddr(host_ad, AF_INET);
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[1770] | 153 | if (np)
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| 154 | name = xstrdup(np->n_name);
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[821] | 155 | }
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[1770] | 156 | if (!name)
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| 157 | name = xstrdup(inet_ntoa(s_in->sin_addr));
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| 158 | pn = xmalloc(sizeof(*pn) + strlen(name)); /* no '+ 1', it's already accounted for */
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| 159 | pn->next = cache;
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[821] | 160 | pn->addr = *s_in;
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| 161 | pn->host = host;
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[1770] | 162 | strcpy(pn->name, name);
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| 163 | cache = pn;
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| 164 | return name;
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[821] | 165 | }
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| 166 |
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[1770] | 167 | #if ENABLE_FEATURE_IPV6
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[821] | 168 |
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| 169 | int INET6_resolve(const char *name, struct sockaddr_in6 *sin6)
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| 170 | {
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| 171 | struct addrinfo req, *ai;
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| 172 | int s;
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| 173 |
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| 174 | memset(&req, '\0', sizeof req);
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| 175 | req.ai_family = AF_INET6;
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[1770] | 176 | s = getaddrinfo(name, NULL, &req, &ai);
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| 177 | if (s) {
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[821] | 178 | bb_error_msg("getaddrinfo: %s: %d", name, s);
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| 179 | return -1;
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| 180 | }
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| 181 | memcpy(sin6, ai->ai_addr, sizeof(struct sockaddr_in6));
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| 182 | freeaddrinfo(ai);
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[1770] | 183 | return 0;
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[821] | 184 | }
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| 185 |
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| 186 | #ifndef IN6_IS_ADDR_UNSPECIFIED
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| 187 | # define IN6_IS_ADDR_UNSPECIFIED(a) \
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| 188 | (((uint32_t *) (a))[0] == 0 && ((uint32_t *) (a))[1] == 0 && \
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| 189 | ((uint32_t *) (a))[2] == 0 && ((uint32_t *) (a))[3] == 0)
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| 190 | #endif
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| 191 |
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| 192 |
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[1770] | 193 | char *INET6_rresolve(struct sockaddr_in6 *sin6, int numeric)
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[821] | 194 | {
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[1770] | 195 | char name[128];
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[821] | 196 | int s;
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| 197 |
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| 198 | /* Grmpf. -FvK */
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| 199 | if (sin6->sin6_family != AF_INET6) {
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| 200 | #ifdef DEBUG
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[1770] | 201 | bb_error_msg("rresolve: unsupport address family %d!",
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[821] | 202 | sin6->sin6_family);
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| 203 | #endif
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| 204 | errno = EAFNOSUPPORT;
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[1770] | 205 | return NULL;
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[821] | 206 | }
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| 207 | if (numeric & 0x7FFF) {
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[1770] | 208 | inet_ntop(AF_INET6, &sin6->sin6_addr, name, sizeof(name));
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| 209 | return xstrdup(name);
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[821] | 210 | }
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| 211 | if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
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[1770] | 212 | if (numeric & 0x8000)
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| 213 | return xstrdup(bb_str_default);
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| 214 | return xstrdup("*");
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[821] | 215 | }
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| 216 |
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[1770] | 217 | s = getnameinfo((struct sockaddr *) sin6, sizeof(struct sockaddr_in6),
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| 218 | name, sizeof(name), NULL, 0, 0);
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[821] | 219 | if (s) {
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| 220 | bb_error_msg("getnameinfo failed");
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[1770] | 221 | return NULL;
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[821] | 222 | }
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[1770] | 223 | return xstrdup(name);
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[821] | 224 | }
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| 225 |
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| 226 | #endif /* CONFIG_FEATURE_IPV6 */
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