1 | /* The Inner Net License, Version 2.00 |
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2 | |
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3 | The author(s) grant permission for redistribution and use in source and |
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4 | binary forms, with or without modification, of the software and documentation |
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5 | provided that the following conditions are met: |
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6 | |
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7 | 0. If you receive a version of the software that is specifically labelled |
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8 | as not being for redistribution (check the version message and/or README), |
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9 | you are not permitted to redistribute that version of the software in any |
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10 | way or form. |
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11 | 1. All terms of the all other applicable copyrights and licenses must be |
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12 | followed. |
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13 | 2. Redistributions of source code must retain the authors' copyright |
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14 | notice(s), this list of conditions, and the following disclaimer. |
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15 | 3. Redistributions in binary form must reproduce the authors' copyright |
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16 | notice(s), this list of conditions, and the following disclaimer in the |
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17 | documentation and/or other materials provided with the distribution. |
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18 | 4. [The copyright holder has authorized the removal of this clause.] |
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19 | 5. Neither the name(s) of the author(s) nor the names of its contributors |
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20 | may be used to endorse or promote products derived from this software |
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21 | without specific prior written permission. |
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22 | |
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23 | THIS SOFTWARE IS PROVIDED BY ITS AUTHORS AND CONTRIBUTORS ``AS IS'' AND ANY |
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24 | EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
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25 | WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
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26 | DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE FOR ANY |
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27 | DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
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28 | (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
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29 | LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON |
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30 | ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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31 | (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
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32 | SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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33 | |
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34 | If these license terms cause you a real problem, contact the author. */ |
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35 | |
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36 | /* This software is Copyright 1996 by Craig Metz, All Rights Reserved. */ |
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37 | |
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38 | #include <alloca.h> |
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39 | #include <errno.h> |
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40 | #include <netdb.h> |
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41 | #include <stdlib.h> |
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42 | #include <stdio.h> |
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43 | #include <string.h> |
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44 | #include <unistd.h> |
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45 | #include <arpa/inet.h> |
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46 | #include <net/if.h> |
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47 | #include <netinet/in.h> |
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48 | #include <sys/param.h> |
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49 | #include <sys/socket.h> |
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50 | #include <sys/types.h> |
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51 | #include <sys/un.h> |
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52 | #include <sys/utsname.h> |
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53 | #define _IO_MTSAFE_IO |
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54 | #include <bits/libc-lock.h> |
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55 | #include <libc-symbols.h> |
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56 | #include "local.h" |
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57 | |
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58 | #ifdef HAVE_LIBIDN |
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59 | # include <libidn/idna.h> |
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60 | extern int __idna_to_unicode_lzlz (const char *input, char **output, |
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61 | int flags); |
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62 | #endif |
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63 | |
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64 | #ifndef min |
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65 | # define min(x,y) (((x) > (y)) ? (y) : (x)) |
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66 | #endif /* min */ |
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67 | |
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68 | libc_freeres_ptr (static char *domain); |
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69 | |
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70 | |
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71 | static char * |
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72 | internal_function |
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73 | nrl_domainname (void) |
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74 | { |
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75 | static int not_first; |
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76 | |
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77 | if (! not_first) |
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78 | { |
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79 | __libc_lock_define_initialized (static, lock); |
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80 | __libc_lock_lock (lock); |
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81 | |
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82 | if (! not_first) |
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83 | { |
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84 | char *c; |
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85 | struct hostent *h, th; |
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86 | size_t tmpbuflen = 1024; |
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87 | char *tmpbuf = alloca (tmpbuflen); |
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88 | int herror; |
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89 | |
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90 | not_first = 1; |
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91 | |
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92 | while (__gethostbyname_r ("localhost", &th, tmpbuf, tmpbuflen, &h, |
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93 | &herror)) |
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94 | { |
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95 | if (herror == NETDB_INTERNAL && errno == ERANGE) |
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96 | tmpbuf = extend_alloca (tmpbuf, tmpbuflen, 2 * tmpbuflen); |
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97 | else |
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98 | break; |
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99 | } |
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100 | |
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101 | if (h && (c = strchr (h->h_name, '.'))) |
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102 | domain = strdup (++c); |
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103 | else |
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104 | { |
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105 | /* The name contains no domain information. Use the name |
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106 | now to get more information. */ |
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107 | while (__gethostname (tmpbuf, tmpbuflen)) |
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108 | tmpbuf = extend_alloca (tmpbuf, tmpbuflen, 2 * tmpbuflen); |
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109 | |
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110 | if ((c = strchr (tmpbuf, '.'))) |
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111 | domain = strdup (++c); |
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112 | else |
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113 | { |
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114 | /* We need to preserve the hostname. */ |
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115 | const char *hstname = alloca (strlen (tmpbuf) + 1); |
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116 | strcpy (hstname, tmpbuf); |
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117 | |
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118 | while (__gethostbyname_r (hstname, &th, tmpbuf, tmpbuflen, |
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119 | &h, &herror)) |
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120 | { |
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121 | if (herror == NETDB_INTERNAL && errno == ERANGE) |
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122 | tmpbuf = extend_alloca (tmpbuf, tmpbuflen, |
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123 | 2 * tmpbuflen); |
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124 | else |
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125 | break; |
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126 | } |
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127 | |
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128 | if (h && (c = strchr(h->h_name, '.'))) |
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129 | domain = strdup (++c); |
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130 | else |
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131 | { |
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132 | struct in_addr in_addr; |
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133 | |
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134 | in_addr.s_addr = htonl (INADDR_LOOPBACK); |
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135 | |
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136 | while (__gethostbyaddr_r ((const char *) &in_addr, |
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137 | sizeof (struct in_addr), |
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138 | AF_INET, &th, tmpbuf, |
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139 | tmpbuflen, &h, &herror)) |
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140 | { |
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141 | if (herror == NETDB_INTERNAL && errno == ERANGE) |
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142 | tmpbuf = extend_alloca (tmpbuf, tmpbuflen, |
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143 | 2 * tmpbuflen); |
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144 | else |
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145 | break; |
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146 | } |
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147 | |
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148 | if (h && (c = strchr (h->h_name, '.'))) |
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149 | domain = strdup (++c); |
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150 | } |
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151 | } |
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152 | } |
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153 | } |
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154 | |
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155 | __libc_lock_unlock (lock); |
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156 | } |
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157 | |
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158 | return domain; |
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159 | }; |
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160 | |
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161 | |
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162 | int |
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163 | getnameinfo (const struct sockaddr *__restrict sa, socklen_t addrlen, |
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164 | char *__restrict host, socklen_t hostlen, char *__restrict serv, |
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165 | socklen_t servlen, unsigned int flags) |
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166 | { |
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167 | int serrno = errno; |
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168 | int tmpbuflen = 1024; |
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169 | int herrno; |
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170 | char *tmpbuf = alloca (tmpbuflen); |
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171 | struct hostent th; |
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172 | int ok = 0; |
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173 | |
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174 | if (flags & ~(NI_NUMERICHOST|NI_NUMERICSERV|NI_NOFQDN|NI_NAMEREQD|NI_DGRAM |
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175 | #ifdef HAVE_LIBIDN |
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176 | |NI_IDN|NI_IDN_ALLOW_UNASSIGNED|NI_IDN_USE_STD3_ASCII_RULES |
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177 | #endif |
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178 | )) |
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179 | return EAI_BADFLAGS; |
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180 | |
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181 | if (sa == NULL || addrlen < sizeof (sa_family_t)) |
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182 | return EAI_FAMILY; |
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183 | |
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184 | switch (sa->sa_family) |
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185 | { |
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186 | case AF_LOCAL: |
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187 | if (addrlen < (socklen_t) (((struct sockaddr_un *) NULL)->sun_path)) |
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188 | return EAI_FAMILY; |
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189 | break; |
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190 | case AF_INET: |
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191 | if (addrlen < sizeof (struct sockaddr_in)) |
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192 | return EAI_FAMILY; |
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193 | break; |
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194 | case AF_INET6: |
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195 | if (addrlen < sizeof (struct sockaddr_in6)) |
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196 | return EAI_FAMILY; |
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197 | break; |
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198 | default: |
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199 | return EAI_FAMILY; |
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200 | } |
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201 | |
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202 | if (host != NULL && hostlen > 0) |
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203 | switch (sa->sa_family) |
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204 | { |
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205 | case AF_INET: |
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206 | case AF_INET6: |
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207 | if (!(flags & NI_NUMERICHOST)) |
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208 | { |
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209 | struct hostent *h = NULL; |
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210 | if (h == NULL) |
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211 | { |
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212 | if (sa->sa_family == AF_INET6) |
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213 | { |
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214 | while (__gethostbyaddr_r ((const void *) &(((const struct sockaddr_in6 *) sa)->sin6_addr), |
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215 | sizeof(struct in6_addr), |
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216 | AF_INET6, &th, tmpbuf, tmpbuflen, |
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217 | &h, &herrno)) |
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218 | { |
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219 | if (herrno == NETDB_INTERNAL) |
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220 | { |
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221 | if (errno == ERANGE) |
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222 | tmpbuf = extend_alloca (tmpbuf, tmpbuflen, |
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223 | 2 * tmpbuflen); |
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224 | else |
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225 | { |
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226 | h_errno = (herrno); |
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227 | errno = (serrno); |
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228 | return EAI_SYSTEM; |
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229 | } |
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230 | } |
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231 | else |
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232 | { |
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233 | break; |
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234 | } |
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235 | } |
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236 | } |
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237 | else |
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238 | { |
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239 | while (__gethostbyaddr_r ((const void *) &(((const struct sockaddr_in *)sa)->sin_addr), |
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240 | sizeof(struct in_addr), AF_INET, |
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241 | &th, tmpbuf, tmpbuflen, |
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242 | &h, &herrno)) |
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243 | { |
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244 | if (errno == ERANGE) |
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245 | tmpbuf = extend_alloca (tmpbuf, tmpbuflen, |
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246 | 2 * tmpbuflen); |
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247 | else |
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248 | { |
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249 | break; |
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250 | } |
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251 | } |
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252 | } |
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253 | } |
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254 | |
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255 | if (h) |
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256 | { |
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257 | char *c; |
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258 | if ((flags & NI_NOFQDN) |
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259 | && (c = nrl_domainname ()) |
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260 | && (c = strstr (h->h_name, c)) |
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261 | && (c != h->h_name) && (*(--c) == '.')) |
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262 | /* Terminate the string after the prefix. */ |
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263 | *c = '\0'; |
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264 | |
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265 | #ifdef HAVE_LIBIDN |
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266 | /* If requested, convert from the IDN format. */ |
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267 | if (flags & NI_IDN) |
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268 | { |
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269 | int idn_flags = 0; |
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270 | if (flags & NI_IDN_ALLOW_UNASSIGNED) |
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271 | idn_flags |= IDNA_ALLOW_UNASSIGNED; |
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272 | if (flags & NI_IDN_USE_STD3_ASCII_RULES) |
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273 | idn_flags |= IDNA_USE_STD3_ASCII_RULES; |
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274 | |
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275 | char *out; |
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276 | int rc = __idna_to_unicode_lzlz (h->h_name, &out, |
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277 | idn_flags); |
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278 | if (rc != IDNA_SUCCESS) |
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279 | { |
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280 | if (rc == IDNA_MALLOC_ERROR) |
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281 | return EAI_MEMORY; |
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282 | if (rc == IDNA_DLOPEN_ERROR) |
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283 | return EAI_SYSTEM; |
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284 | return EAI_IDN_ENCODE; |
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285 | } |
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286 | |
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287 | if (out != h->h_name) |
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288 | { |
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289 | h->h_name = strdupa (out); |
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290 | free (out); |
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291 | } |
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292 | } |
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293 | #endif |
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294 | |
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295 | size_t len = strlen (h->h_name) + 1; |
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296 | if (len > hostlen) |
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297 | return EAI_OVERFLOW; |
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298 | |
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299 | memcpy (host, h->h_name, len); |
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300 | |
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301 | ok = 1; |
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302 | } |
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303 | } |
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304 | |
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305 | if (!ok) |
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306 | { |
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307 | if (flags & NI_NAMEREQD) |
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308 | { |
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309 | __set_errno (serrno); |
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310 | return EAI_NONAME; |
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311 | } |
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312 | else |
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313 | { |
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314 | const char *c; |
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315 | if (sa->sa_family == AF_INET6) |
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316 | { |
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317 | const struct sockaddr_in6 *sin6p; |
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318 | uint32_t scopeid; |
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319 | |
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320 | sin6p = (const struct sockaddr_in6 *) sa; |
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321 | |
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322 | c = inet_ntop (AF_INET6, |
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323 | (const void *) &sin6p->sin6_addr, host, hostlen); |
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324 | scopeid = sin6p->sin6_scope_id; |
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325 | if (scopeid != 0) |
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326 | { |
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327 | /* Buffer is >= IFNAMSIZ+1. */ |
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328 | char scopebuf[IFNAMSIZ + 1]; |
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329 | char *scopeptr; |
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330 | int ni_numericscope = 0; |
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331 | size_t real_hostlen = strnlen (host, hostlen); |
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332 | size_t scopelen = 0; |
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333 | |
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334 | scopebuf[0] = SCOPE_DELIMITER; |
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335 | scopebuf[1] = '\0'; |
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336 | scopeptr = &scopebuf[1]; |
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337 | |
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338 | if (IN6_IS_ADDR_LINKLOCAL (&sin6p->sin6_addr) |
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339 | || IN6_IS_ADDR_MC_LINKLOCAL (&sin6p->sin6_addr)) |
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340 | { |
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341 | if (if_indextoname (scopeid, scopeptr) == NULL) |
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342 | ++ni_numericscope; |
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343 | else |
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344 | scopelen = strlen (scopebuf); |
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345 | } |
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346 | else |
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347 | ++ni_numericscope; |
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348 | |
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349 | if (ni_numericscope) |
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350 | scopelen = 1 + snprintf (scopeptr, |
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351 | (scopebuf |
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352 | + sizeof scopebuf |
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353 | - scopeptr), |
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354 | "%u", scopeid); |
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355 | |
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356 | if (real_hostlen + scopelen + 1 > hostlen) |
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357 | /* XXX We should not fail here. Simply enlarge |
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358 | the buffer or return with out of memory. */ |
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359 | return EAI_SYSTEM; |
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360 | memcpy (host + real_hostlen, scopebuf, scopelen + 1); |
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361 | } |
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362 | } |
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363 | else |
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364 | c = inet_ntop (AF_INET, |
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365 | (const void *) &(((const struct sockaddr_in *) sa)->sin_addr), |
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366 | host, hostlen); |
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367 | if (c == NULL) |
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368 | { |
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369 | __set_errno (serrno); |
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370 | return EAI_SYSTEM; |
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371 | } |
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372 | } |
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373 | ok = 1; |
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374 | } |
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375 | break; |
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376 | |
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377 | case AF_LOCAL: |
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378 | if (!(flags & NI_NUMERICHOST)) |
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379 | { |
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380 | struct utsname utsname; |
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381 | |
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382 | if (!uname (&utsname)) |
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383 | { |
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384 | strncpy (host, utsname.nodename, hostlen); |
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385 | break; |
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386 | }; |
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387 | }; |
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388 | |
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389 | if (flags & NI_NAMEREQD) |
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390 | { |
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391 | __set_errno (serrno); |
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392 | return EAI_NONAME; |
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393 | } |
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394 | |
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395 | strncpy (host, "localhost", hostlen); |
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396 | break; |
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397 | |
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398 | default: |
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399 | return EAI_FAMILY; |
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400 | } |
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401 | |
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402 | if (serv && (servlen > 0)) |
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403 | switch (sa->sa_family) |
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404 | { |
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405 | case AF_INET: |
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406 | case AF_INET6: |
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407 | if (!(flags & NI_NUMERICSERV)) |
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408 | { |
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409 | struct servent *s, ts; |
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410 | while (__getservbyport_r (((const struct sockaddr_in *) sa)->sin_port, |
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411 | ((flags & NI_DGRAM) ? "udp" : "tcp"), |
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412 | &ts, tmpbuf, tmpbuflen, &s)) |
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413 | { |
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414 | if (herrno == NETDB_INTERNAL) |
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415 | { |
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416 | if (errno == ERANGE) |
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417 | tmpbuf = extend_alloca (tmpbuf, tmpbuflen, |
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418 | 2 * tmpbuflen); |
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419 | else |
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420 | { |
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421 | __set_errno (serrno); |
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422 | return EAI_SYSTEM; |
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423 | } |
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424 | } |
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425 | else |
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426 | { |
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427 | break; |
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428 | } |
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429 | } |
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430 | if (s) |
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431 | { |
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432 | strncpy (serv, s->s_name, servlen); |
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433 | break; |
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434 | } |
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435 | } |
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436 | |
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437 | if (snprintf (serv, servlen, "%d", |
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438 | ntohs (((const struct sockaddr_in *) sa)->sin_port)) |
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439 | + 1 > servlen) |
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440 | return EAI_OVERFLOW; |
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441 | |
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442 | break; |
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443 | |
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444 | case AF_LOCAL: |
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445 | strncpy (serv, ((const struct sockaddr_un *) sa)->sun_path, servlen); |
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446 | break; |
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447 | } |
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448 | |
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449 | if (host && (hostlen > 0)) |
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450 | host[hostlen-1] = 0; |
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451 | if (serv && (servlen > 0)) |
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452 | serv[servlen-1] = 0; |
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453 | errno = serrno; |
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454 | return 0; |
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455 | } |
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456 | libc_hidden_def (getnameinfo) |
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