1 | /* vi: set sw=4 ts=4: */
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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 | * Licensed under GPLv2, see file LICENSE in this source tree.
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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 FAST_FUNC 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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17 | #if ENABLE_FEATURE_ETC_NETWORKS
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18 | struct netent *np;
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19 | #endif
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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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26 | if (strcmp(name, "default") == 0) {
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27 | s_in->sin_addr.s_addr = INADDR_ANY;
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28 | return 1;
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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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37 | bb_error_msg("gethostbyname(%s)", name);
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38 | }
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39 | #endif
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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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47 | }
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48 | #if ENABLE_FEATURE_ETC_NETWORKS
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49 | /* Try the NETWORKS database to see if this is a known network. */
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50 | #ifdef DEBUG
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51 | bb_error_msg("getnetbyname(%s)", name);
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52 | #endif
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53 | np = getnetbyname(name);
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54 | if (np != NULL) {
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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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58 | #endif
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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 | bb_error_msg("gethostbyname(%s)", name);
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67 | #endif
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68 | hp = gethostbyname(name);
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69 | if (hp == NULL) {
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70 | return -1;
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71 | }
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72 | memcpy(&s_in->sin_addr, hp->h_addr_list[0], sizeof(struct in_addr));
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73 | return 0;
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74 | }
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75 |
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76 |
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77 | /* numeric: & 0x8000: default instead of *,
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78 | * & 0x4000: host instead of net,
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79 | * & 0x0fff: don't resolve
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80 | */
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81 | char* FAST_FUNC INET_rresolve(struct sockaddr_in *s_in, int numeric, uint32_t netmask)
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82 | {
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83 | /* addr-to-name cache */
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84 | struct addr {
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85 | struct addr *next;
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86 | struct sockaddr_in addr;
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87 | int host;
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88 | char name[1];
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89 | };
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90 | static struct addr *cache = NULL;
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91 |
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92 | struct addr *pn;
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93 | char *name;
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94 | uint32_t ad, host_ad;
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95 | int host = 0;
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96 |
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97 | if (s_in->sin_family != AF_INET) {
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98 | #ifdef DEBUG
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99 | bb_error_msg("rresolve: unsupported address family %d!",
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100 | s_in->sin_family);
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101 | #endif
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102 | errno = EAFNOSUPPORT;
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103 | return NULL;
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104 | }
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105 | ad = s_in->sin_addr.s_addr;
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106 | #ifdef DEBUG
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107 | bb_error_msg("rresolve: %08x, mask %08x, num %08x", (unsigned)ad, netmask, numeric);
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108 | #endif
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109 | if (ad == INADDR_ANY) {
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110 | if ((numeric & 0x0FFF) == 0) {
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111 | if (numeric & 0x8000)
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112 | return xstrdup("default");
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113 | return xstrdup("*");
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114 | }
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115 | }
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116 | if (numeric & 0x0FFF)
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117 | return xstrdup(inet_ntoa(s_in->sin_addr));
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118 |
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119 | if ((ad & (~netmask)) != 0 || (numeric & 0x4000))
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120 | host = 1;
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121 | pn = cache;
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122 | while (pn) {
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123 | if (pn->addr.sin_addr.s_addr == ad && pn->host == host) {
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124 | #ifdef DEBUG
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125 | bb_error_msg("rresolve: found %s %08x in cache",
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126 | (host ? "host" : "net"), (unsigned)ad);
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127 | #endif
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128 | return xstrdup(pn->name);
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129 | }
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130 | pn = pn->next;
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131 | }
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132 |
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133 | host_ad = ntohl(ad);
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134 | name = NULL;
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135 | if (host) {
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136 | struct hostent *ent;
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137 | #ifdef DEBUG
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138 | bb_error_msg("gethostbyaddr (%08x)", (unsigned)ad);
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139 | #endif
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140 | ent = gethostbyaddr((char *) &ad, 4, AF_INET);
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141 | if (ent)
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142 | name = xstrdup(ent->h_name);
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143 | } else if (ENABLE_FEATURE_ETC_NETWORKS) {
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144 | struct netent *np;
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145 | #ifdef DEBUG
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146 | bb_error_msg("getnetbyaddr (%08x)", (unsigned)host_ad);
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147 | #endif
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148 | np = getnetbyaddr(host_ad, AF_INET);
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149 | if (np)
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150 | name = xstrdup(np->n_name);
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151 | }
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152 | if (!name)
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153 | name = xstrdup(inet_ntoa(s_in->sin_addr));
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154 | pn = xmalloc(sizeof(*pn) + strlen(name)); /* no '+ 1', it's already accounted for */
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155 | pn->next = cache;
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156 | pn->addr = *s_in;
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157 | pn->host = host;
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158 | strcpy(pn->name, name);
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159 | cache = pn;
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160 | return name;
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161 | }
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162 |
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163 | #if ENABLE_FEATURE_IPV6
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164 |
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165 | int FAST_FUNC INET6_resolve(const char *name, struct sockaddr_in6 *sin6)
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166 | {
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167 | struct addrinfo req, *ai;
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168 | int s;
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169 |
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170 | memset(&req, '\0', sizeof req);
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171 | req.ai_family = AF_INET6;
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172 | s = getaddrinfo(name, NULL, &req, &ai);
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173 | if (s) {
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174 | bb_error_msg("getaddrinfo: %s: %d", name, s);
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175 | return -1;
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176 | }
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177 | memcpy(sin6, ai->ai_addr, sizeof(struct sockaddr_in6));
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178 | freeaddrinfo(ai);
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179 | return 0;
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180 | }
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181 |
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182 | #ifndef IN6_IS_ADDR_UNSPECIFIED
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183 | # define IN6_IS_ADDR_UNSPECIFIED(a) \
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184 | (((uint32_t *) (a))[0] == 0 && ((uint32_t *) (a))[1] == 0 && \
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185 | ((uint32_t *) (a))[2] == 0 && ((uint32_t *) (a))[3] == 0)
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186 | #endif
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187 |
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188 |
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189 | char* FAST_FUNC INET6_rresolve(struct sockaddr_in6 *sin6, int numeric)
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190 | {
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191 | char name[128];
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192 | int s;
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193 |
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194 | if (sin6->sin6_family != AF_INET6) {
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195 | #ifdef DEBUG
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196 | bb_error_msg("rresolve: unsupported address family %d!",
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197 | sin6->sin6_family);
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198 | #endif
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199 | errno = EAFNOSUPPORT;
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200 | return NULL;
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201 | }
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202 | if (numeric & 0x7FFF) {
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203 | inet_ntop(AF_INET6, &sin6->sin6_addr, name, sizeof(name));
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204 | return xstrdup(name);
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205 | }
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206 | if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
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207 | if (numeric & 0x8000)
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208 | return xstrdup("default");
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209 | return xstrdup("*");
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210 | }
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211 |
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212 | s = getnameinfo((struct sockaddr *) sin6, sizeof(struct sockaddr_in6),
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213 | name, sizeof(name), NULL, 0, 0);
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214 | if (s) {
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215 | bb_error_msg("getnameinfo failed");
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216 | return NULL;
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217 | }
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218 | return xstrdup(name);
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219 | }
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220 |
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221 | #endif /* CONFIG_FEATURE_IPV6 */
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