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1 /* |
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2 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. |
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3 * All rights reserved. |
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4 * |
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5 * Redistribution and use in source and binary forms, with or without |
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6 * modification, are permitted provided that the following conditions |
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7 * are met: |
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8 * 1. Redistributions of source code must retain the above copyright |
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9 * notice, this list of conditions and the following disclaimer. |
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10 * 2. Redistributions in binary form must reproduce the above copyright |
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11 * notice, this list of conditions and the following disclaimer in the |
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12 * documentation and/or other materials provided with the distribution. |
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13 * 3. Neither the name of the project nor the names of its contributors |
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14 * may be used to endorse or promote products derived from this software |
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15 * without specific prior written permission. |
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16 * |
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17 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND |
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18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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20 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE |
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21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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27 * SUCH DAMAGE. |
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28 */ |
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29 |
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30 /* |
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31 * Issues to be discussed: |
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32 * - Thread safe-ness must be checked |
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33 * - Return values. There seems to be no standard for return value (RFC2133) |
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34 * but INRIA implementation returns EAI_xxx defined for getaddrinfo(). |
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35 */ |
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36 |
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37 #if 0 |
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38 #include <sys/types.h> |
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39 #include <sys/socket.h> |
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40 #include <netinet/in.h> |
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41 #include <arpa/inet.h> |
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42 #include <arpa/nameser.h> |
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43 #include <netdb.h> |
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44 #include <resolv.h> |
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45 #include <string.h> |
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46 #include <stddef.h> |
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47 |
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48 #include "addrinfo.h" |
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49 #endif |
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50 |
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51 #define SUCCESS 0 |
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52 #define YES 1 |
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53 #define NO 0 |
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54 |
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55 static struct gni_afd { |
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56 int a_af; |
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57 int a_addrlen; |
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58 int a_socklen; |
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59 int a_off; |
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60 } gni_afdl [] = { |
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61 #ifdef ENABLE_IPV6 |
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62 {PF_INET6, sizeof(struct in6_addr), sizeof(struct sockaddr_in6), |
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63 offsetof(struct sockaddr_in6, sin6_addr)}, |
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64 #endif |
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65 {PF_INET, sizeof(struct in_addr), sizeof(struct sockaddr_in), |
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66 offsetof(struct sockaddr_in, sin_addr)}, |
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67 {0, 0, 0}, |
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68 }; |
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69 |
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70 struct gni_sockinet { |
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71 u_char si_len; |
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72 u_char si_family; |
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73 u_short si_port; |
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74 }; |
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75 |
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76 #define ENI_NOSOCKET 0 |
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77 #define ENI_NOSERVNAME 1 |
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78 #define ENI_NOHOSTNAME 2 |
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79 #define ENI_MEMORY 3 |
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80 #define ENI_SYSTEM 4 |
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81 #define ENI_FAMILY 5 |
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82 #define ENI_SALEN 6 |
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83 |
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84 /* forward declaration to make gcc happy */ |
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85 int getnameinfo Py_PROTO((const struct sockaddr *, size_t, char *, size_t, |
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86 char *, size_t, int)); |
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87 |
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88 int |
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89 getnameinfo(sa, salen, host, hostlen, serv, servlen, flags) |
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90 const struct sockaddr *sa; |
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91 size_t salen; |
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92 char *host; |
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93 size_t hostlen; |
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94 char *serv; |
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95 size_t servlen; |
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96 int flags; |
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97 { |
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98 struct gni_afd *gni_afd; |
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99 struct servent *sp; |
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100 struct hostent *hp; |
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101 u_short port; |
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102 int family, len, i; |
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103 char *addr, *p; |
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104 u_long v4a; |
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105 #ifdef ENABLE_IPV6 |
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106 u_char pfx; |
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107 #endif |
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108 int h_error; |
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109 char numserv[512]; |
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110 char numaddr[512]; |
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111 |
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112 if (sa == NULL) |
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113 return ENI_NOSOCKET; |
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114 |
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115 #ifdef HAVE_SOCKADDR_SA_LEN |
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116 len = sa->sa_len; |
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117 if (len != salen) return ENI_SALEN; |
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118 #else |
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119 len = salen; |
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120 #endif |
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121 |
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122 family = sa->sa_family; |
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123 for (i = 0; gni_afdl[i].a_af; i++) |
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124 if (gni_afdl[i].a_af == family) { |
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125 gni_afd = &gni_afdl[i]; |
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126 goto found; |
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127 } |
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128 return ENI_FAMILY; |
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129 |
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130 found: |
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131 if (len != gni_afd->a_socklen) return ENI_SALEN; |
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132 |
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133 port = ((struct gni_sockinet *)sa)->si_port; /* network byte order */ |
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134 addr = (char *)sa + gni_afd->a_off; |
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135 |
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136 if (serv == NULL || servlen == 0) { |
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137 /* what we should do? */ |
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138 } else if (flags & NI_NUMERICSERV) { |
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139 sprintf(numserv, "%d", ntohs(port)); |
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140 if (strlen(numserv) > servlen) |
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141 return ENI_MEMORY; |
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142 strcpy(serv, numserv); |
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143 } else { |
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144 sp = getservbyport(port, (flags & NI_DGRAM) ? "udp" : "tcp"); |
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145 if (sp) { |
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146 if (strlen(sp->s_name) > servlen) |
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147 return ENI_MEMORY; |
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148 strcpy(serv, sp->s_name); |
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149 } else |
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150 return ENI_NOSERVNAME; |
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151 } |
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152 |
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153 switch (sa->sa_family) { |
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154 case AF_INET: |
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155 v4a = ((struct sockaddr_in *)sa)->sin_addr.s_addr; |
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156 if (IN_MULTICAST(v4a) || IN_EXPERIMENTAL(v4a)) |
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157 flags |= NI_NUMERICHOST; |
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158 v4a >>= IN_CLASSA_NSHIFT; |
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159 if (v4a == 0 || v4a == IN_LOOPBACKNET) |
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160 flags |= NI_NUMERICHOST; |
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161 break; |
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162 #ifdef ENABLE_IPV6 |
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163 case AF_INET6: |
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164 pfx = ((struct sockaddr_in6 *)sa)->sin6_addr.s6_addr8[0]; |
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165 if (pfx == 0 || pfx == 0xfe || pfx == 0xff) |
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166 flags |= NI_NUMERICHOST; |
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167 break; |
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168 #endif |
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169 } |
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170 if (host == NULL || hostlen == 0) { |
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171 /* what should we do? */ |
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172 } else if (flags & NI_NUMERICHOST) { |
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173 if (inet_ntop(gni_afd->a_af, addr, numaddr, sizeof(numaddr)) |
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174 == NULL) |
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175 return ENI_SYSTEM; |
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176 if (strlen(numaddr) > hostlen) |
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177 return ENI_MEMORY; |
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178 strcpy(host, numaddr); |
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179 } else { |
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180 #ifdef ENABLE_IPV6 |
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181 hp = getipnodebyaddr(addr, gni_afd->a_addrlen, gni_afd->a_af, &h_error); |
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182 #else |
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183 hp = gethostbyaddr(addr, gni_afd->a_addrlen, gni_afd->a_af); |
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184 h_error = h_errno; |
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185 #endif |
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186 |
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187 if (hp) { |
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188 if (flags & NI_NOFQDN) { |
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189 p = strchr(hp->h_name, '.'); |
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190 if (p) *p = '\0'; |
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191 } |
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192 if (strlen(hp->h_name) > hostlen) { |
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193 #ifdef ENABLE_IPV6 |
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194 freehostent(hp); |
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195 #endif |
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196 return ENI_MEMORY; |
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197 } |
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198 strcpy(host, hp->h_name); |
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199 #ifdef ENABLE_IPV6 |
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200 freehostent(hp); |
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201 #endif |
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202 } else { |
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203 if (flags & NI_NAMEREQD) |
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204 return ENI_NOHOSTNAME; |
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205 if (inet_ntop(gni_afd->a_af, addr, numaddr, sizeof(numaddr)) |
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206 == NULL) |
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207 return ENI_NOHOSTNAME; |
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208 if (strlen(numaddr) > hostlen) |
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209 return ENI_MEMORY; |
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210 strcpy(host, numaddr); |
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211 } |
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212 } |
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213 return SUCCESS; |
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214 } |