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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