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annotate packages/net/common/current/src/ifaddrs.c @ 1777:c16341b1bac6 default tip

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* Added execute permissions to files missed in conversion from CVS
author alexs
date Mon, 12 Oct 2009 02:26:09 +0100
parents 6627c3a1df79
children
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1 //==========================================================================
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2 //
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3 // src/ifaddrs.c
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4 //
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5 //==========================================================================
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6 //####BSDCOPYRIGHTBEGIN####
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7 //
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8 // -------------------------------------------
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9 //
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10 // Portions of this software may have been derived from OpenBSD,
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11 // FreeBSD or other sources, and are covered by the appropriate
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12 // copyright disclaimers included herein.
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13 //
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14 // Portions created by Red Hat are
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15 // Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.
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16 //
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17 // -------------------------------------------
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18 //
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19 //####BSDCOPYRIGHTEND####
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20 //==========================================================================
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21
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22 //
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23 // Adapted from KAME getifaddrs.c, if_nametoindex.c, if_indextoname.c
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24 //
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25
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26 /* $KAME: getifaddrs.c,v 1.9 2001/08/20 02:31:20 itojun Exp $ */
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27 /* $KAME: if_nametoindex.c,v 1.6 2000/11/24 08:18:54 itojun Exp $ */
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28 /* $KAME: if_indextoname.c,v 1.7 2000/11/08 03:09:30 itojun Exp $ */
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29
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30 /*
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31 * Copyright (c) 1995, 1999
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32 * Berkeley Software Design, Inc. All rights reserved.
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33 *
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34 * Redistribution and use in source and binary forms, with or without
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35 * modification, are permitted provided that the following conditions
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36 * are met:
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37 * 1. Redistributions of source code must retain the above copyright
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38 * notice, this list of conditions and the following disclaimer.
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39 *
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40 * THIS SOFTWARE IS PROVIDED BY Berkeley Software Design, Inc. ``AS IS'' AND
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41 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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43 * ARE DISCLAIMED. IN NO EVENT SHALL Berkeley Software Design, Inc. BE LIABLE
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44 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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45 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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46 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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48 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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49 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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50 * SUCH DAMAGE.
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51 *
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52 * BSDI getifaddrs.c,v 2.12 2000/02/23 14:51:59 dab Exp
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53 */
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54
957
db3e0a2fda2f 2003-04-12 Andrew Lunn <andrew.lunn@ascom.ch>
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55 #include <cyg/infra/diag.h>
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56
208
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57 #include <unistd.h>
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58 #include <stdlib.h>
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59 #include <string.h>
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60
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61 #undef _KERNEL
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62 #undef __INSIDE_NET
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63 #include <sys/param.h>
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64 #include <sys/types.h>
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65 #include <sys/ioctl.h>
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66 #include <sys/socket.h>
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67 #include <net/if.h>
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68 #include <net/if_dl.h>
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69 #ifndef CYGPKG_NET_OPENBSD_STACK
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70 #include <net/if_var.h>
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71 #endif
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72 #include <errno.h>
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73 #include <netinet/in.h>
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74 #include <net/netdb.h>
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75 #include <ifaddrs.h>
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76 #include <netinet/in_var.h>
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77
208
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78
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79 #if !defined(AF_LINK)
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80 #define SA_LEN(sa) sizeof(struct sockaddr)
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81 #endif
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82
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83 #if !defined(SA_LEN)
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84 #define SA_LEN(sa) (sa)->sa_len
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85 #endif
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86
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87 #define SALIGN (sizeof(long) - 1)
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88 #define SA_RLEN(sa) ((sa)->sa_len ? (((sa)->sa_len + SALIGN) & ~SALIGN) : (SALIGN + 1))
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89
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90 #ifndef ALIGNBYTES
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91 /*
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92 * On systems with a routing socket, ALIGNBYTES should match the value
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93 * that the kernel uses when building the messages.
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94 */
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95 #define ALIGNBYTES XXX
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96 #endif
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97 #ifndef ALIGN
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98 #define ALIGN(p) (((u_long)(p) + ALIGNBYTES) &~ ALIGNBYTES)
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99 #endif
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100
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101 int
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102 getifaddrs(struct ifaddrs **pif)
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103 {
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104 int icnt = 1; // Interface count
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105 int dcnt = 0; // Data [length] count
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106 int ncnt = 0; // Length of interface names
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107 char *buf;
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108 #define IF_WORK_SPACE_SZ 1024
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109 int i, sock;
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110 #ifdef CYGPKG_NET_INET6
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111 int sock6;
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112 struct in6_ifreq ifrq6;
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113 #endif
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114 struct ifconf ifc;
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115 struct ifreq *ifr, *lifr;
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116 struct ifreq ifrq;
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117 char *data, *names;
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118 struct ifaddrs *ifa, *ift;
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119
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120 buf = malloc(IF_WORK_SPACE_SZ);
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121 if (buf == NULL)
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122 return (-1);
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123 ifc.ifc_buf = buf;
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124 ifc.ifc_len = IF_WORK_SPACE_SZ;
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125
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126 if ((sock = socket(AF_INET, SOCK_STREAM, 0)) < 0)
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127 {
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128 free(buf);
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129 return (-1);
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130 }
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131 i = ioctl(sock, SIOCGIFCONF, (char *)&ifc);
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132
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133 if (i < 0) {
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134 close(sock);
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135 free(buf);
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136 return (-1);
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137 }
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138
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139 ifr = ifc.ifc_req;
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140 lifr = (struct ifreq *)&ifc.ifc_buf[ifc.ifc_len];
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141
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142 while (ifr < lifr) {
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parents:
diff changeset
143 struct sockaddr *sa;
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144
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145 sa = &ifr->ifr_addr;
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146 ++icnt;
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147 dcnt += SA_RLEN(sa) * 3; /* addr, mask, brdcst */
208
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148 ncnt += sizeof(ifr->ifr_name) + 1;
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149
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150 if (SA_LEN(sa) < sizeof(*sa))
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151 ifr = (struct ifreq *)(((char *)sa) + sizeof(*sa));
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152 else
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153 ifr = (struct ifreq *)(((char *)sa) + SA_LEN(sa));
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154 }
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155
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156 if (icnt + dcnt + ncnt == 1) {
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157 // Nothing found
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158 *pif = NULL;
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159 free(buf);
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160 close(sock);
208
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161 return (0);
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162 }
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163 data = malloc(sizeof(struct ifaddrs) * icnt + dcnt + ncnt);
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164 if (data == NULL) {
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165 free(buf);
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166 close(sock);
208
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167 return(-1);
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168 }
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169
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170 ifa = (struct ifaddrs *)(void *)data;
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171 data += sizeof(struct ifaddrs) * icnt;
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172 names = data + dcnt;
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173
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174 memset(ifa, 0, sizeof(struct ifaddrs) * icnt);
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175 ift = ifa;
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176
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177 ifr = ifc.ifc_req;
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178
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179 #ifdef CYGPKG_NET_INET6
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180 if ((sock6 = socket(AF_INET6, SOCK_STREAM, 0)) < 0) {
1219
f2d548ecdbde Be more careful with allocated space, etc. in getifaddrs()
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181 free(buf);
f2d548ecdbde Be more careful with allocated space, etc. in getifaddrs()
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diff changeset
182 free(data);
1007
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183 close(sock);
16d247bb9c70 * src/ifaddrs.c (getifaddrs): Fill in flags, netmask and broadcast
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184 return (-1);
16d247bb9c70 * src/ifaddrs.c (getifaddrs): Fill in flags, netmask and broadcast
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185 }
16d247bb9c70 * src/ifaddrs.c (getifaddrs): Fill in flags, netmask and broadcast
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186 #endif
16d247bb9c70 * src/ifaddrs.c (getifaddrs): Fill in flags, netmask and broadcast
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187
208
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188 while (ifr < lifr) {
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diff changeset
189 struct sockaddr * sa;
208
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190
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191 ift->ifa_name = names;
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192 names[sizeof(ifr->ifr_name)] = 0;
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193 strncpy(names, ifr->ifr_name, sizeof(ifr->ifr_name));
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194 while (*names++) ;
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195
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196 ift->ifa_addr = (struct sockaddr *)data;
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197 sa = &ifr->ifr_addr;
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198 memcpy(data, sa, SA_LEN(sa));
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199 data += SA_RLEN(sa);
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200
16d247bb9c70 * src/ifaddrs.c (getifaddrs): Fill in flags, netmask and broadcast
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diff changeset
201 if ((sa->sa_family == AF_INET) || (sa->sa_family == AF_INET6)) {
1010
9dd1e2b5492e Fixed a compiler warning.
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diff changeset
202 struct sockaddr *sa_netmask = NULL;
9dd1e2b5492e Fixed a compiler warning.
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diff changeset
203 struct sockaddr *sa_broadcast = NULL;
1670
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diff changeset
204 struct sockaddr *sa_dst = NULL;
6627c3a1df79 * src/ifaddrs.c (getifaddrs): Return destination address for P2P
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diff changeset
205
1007
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206 memset(&ifrq,0,sizeof(ifrq));
16d247bb9c70 * src/ifaddrs.c (getifaddrs): Fill in flags, netmask and broadcast
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207 strcpy(ifrq.ifr_name,ifr->ifr_name);
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208 ioctl( sock, SIOCGIFFLAGS, &ifrq );
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209
16d247bb9c70 * src/ifaddrs.c (getifaddrs): Fill in flags, netmask and broadcast
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diff changeset
210 ift->ifa_flags = ifrq.ifr_flags;
16d247bb9c70 * src/ifaddrs.c (getifaddrs): Fill in flags, netmask and broadcast
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diff changeset
211
16d247bb9c70 * src/ifaddrs.c (getifaddrs): Fill in flags, netmask and broadcast
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212 memcpy(&ifrq.ifr_addr, ift->ifa_addr,sizeof(struct sockaddr));
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diff changeset
213 if (sa->sa_family == AF_INET) {
16d247bb9c70 * src/ifaddrs.c (getifaddrs): Fill in flags, netmask and broadcast
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diff changeset
214 ioctl(sock, SIOCGIFNETMASK, &ifrq);
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215 sa_netmask = &ifrq.ifr_addr;
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diff changeset
216 }
16d247bb9c70 * src/ifaddrs.c (getifaddrs): Fill in flags, netmask and broadcast
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diff changeset
217 #ifdef CYGPKG_NET_INET6
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diff changeset
218 if (sa->sa_family == AF_INET6) {
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diff changeset
219 memset(&ifrq6,0,sizeof(ifrq));
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diff changeset
220 strcpy(ifrq6.ifr_name,ifr->ifr_name);
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221 memcpy(&ifrq6.ifr_addr, ift->ifa_addr,sizeof(struct sockaddr));
16d247bb9c70 * src/ifaddrs.c (getifaddrs): Fill in flags, netmask and broadcast
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diff changeset
222
16d247bb9c70 * src/ifaddrs.c (getifaddrs): Fill in flags, netmask and broadcast
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diff changeset
223 ioctl(sock6, SIOCGIFNETMASK_IN6, &ifrq6);
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diff changeset
224 sa_netmask = (struct sockaddr *)&ifrq6.ifr_addr;
16d247bb9c70 * src/ifaddrs.c (getifaddrs): Fill in flags, netmask and broadcast
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diff changeset
225 }
16d247bb9c70 * src/ifaddrs.c (getifaddrs): Fill in flags, netmask and broadcast
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diff changeset
226 #endif
16d247bb9c70 * src/ifaddrs.c (getifaddrs): Fill in flags, netmask and broadcast
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227 ift->ifa_netmask = (struct sockaddr *)data;
16d247bb9c70 * src/ifaddrs.c (getifaddrs): Fill in flags, netmask and broadcast
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diff changeset
228 memcpy(data, sa_netmask, SA_LEN(sa_netmask));
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diff changeset
229 data += SA_RLEN(sa_netmask);
16d247bb9c70 * src/ifaddrs.c (getifaddrs): Fill in flags, netmask and broadcast
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diff changeset
230
16d247bb9c70 * src/ifaddrs.c (getifaddrs): Fill in flags, netmask and broadcast
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diff changeset
231 memcpy(&ifrq.ifr_addr, ift->ifa_addr,sizeof(struct sockaddr));
1670
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asl
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diff changeset
232 if ((sa->sa_family == AF_INET) && (ift->ifa_flags & IFF_BROADCAST)) {
1007
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diff changeset
233 if (ioctl(sock, SIOCGIFBRDADDR, &ifrq) == 0) {
16d247bb9c70 * src/ifaddrs.c (getifaddrs): Fill in flags, netmask and broadcast
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diff changeset
234 sa_broadcast = &ifrq.ifr_addr;
16d247bb9c70 * src/ifaddrs.c (getifaddrs): Fill in flags, netmask and broadcast
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diff changeset
235 ift->ifa_broadaddr = (struct sockaddr *)data;
16d247bb9c70 * src/ifaddrs.c (getifaddrs): Fill in flags, netmask and broadcast
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diff changeset
236 memcpy(data, sa_broadcast, SA_LEN(sa_broadcast));
16d247bb9c70 * src/ifaddrs.c (getifaddrs): Fill in flags, netmask and broadcast
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diff changeset
237 data += SA_RLEN(sa_broadcast);
16d247bb9c70 * src/ifaddrs.c (getifaddrs): Fill in flags, netmask and broadcast
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diff changeset
238 }
16d247bb9c70 * src/ifaddrs.c (getifaddrs): Fill in flags, netmask and broadcast
asl
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diff changeset
239 }
1670
6627c3a1df79 * src/ifaddrs.c (getifaddrs): Return destination address for P2P
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diff changeset
240
6627c3a1df79 * src/ifaddrs.c (getifaddrs): Return destination address for P2P
asl
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diff changeset
241 memcpy(&ifrq.ifr_addr, ift->ifa_addr,sizeof(struct sockaddr));
6627c3a1df79 * src/ifaddrs.c (getifaddrs): Return destination address for P2P
asl
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diff changeset
242 if ((sa->sa_family == AF_INET) &&
6627c3a1df79 * src/ifaddrs.c (getifaddrs): Return destination address for P2P
asl
parents: 1219
diff changeset
243 (ift->ifa_flags & IFF_POINTOPOINT)) {
6627c3a1df79 * src/ifaddrs.c (getifaddrs): Return destination address for P2P
asl
parents: 1219
diff changeset
244 if (ioctl(sock, SIOCGIFDSTADDR, &ifrq) == 0) {
6627c3a1df79 * src/ifaddrs.c (getifaddrs): Return destination address for P2P
asl
parents: 1219
diff changeset
245 sa_dst = &ifrq.ifr_addr;
6627c3a1df79 * src/ifaddrs.c (getifaddrs): Return destination address for P2P
asl
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diff changeset
246 ift->ifa_dstaddr = (struct sockaddr *)data;
6627c3a1df79 * src/ifaddrs.c (getifaddrs): Return destination address for P2P
asl
parents: 1219
diff changeset
247 memcpy(data, sa_dst, SA_LEN(sa_dst));
6627c3a1df79 * src/ifaddrs.c (getifaddrs): Return destination address for P2P
asl
parents: 1219
diff changeset
248 data += SA_RLEN(sa_dst);
6627c3a1df79 * src/ifaddrs.c (getifaddrs): Return destination address for P2P
asl
parents: 1219
diff changeset
249 }
6627c3a1df79 * src/ifaddrs.c (getifaddrs): Return destination address for P2P
asl
parents: 1219
diff changeset
250 }
1007
16d247bb9c70 * src/ifaddrs.c (getifaddrs): Fill in flags, netmask and broadcast
asl
parents: 957
diff changeset
251 }
1670
6627c3a1df79 * src/ifaddrs.c (getifaddrs): Return destination address for P2P
asl
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diff changeset
252
208
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parents:
diff changeset
253 if (SA_LEN(sa) < sizeof(*sa))
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diff changeset
254 ifr = (struct ifreq *)(((char *)sa) + sizeof(*sa));
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diff changeset
255 else
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diff changeset
256 ifr = (struct ifreq *)(((char *)sa) + SA_LEN(sa));
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parents:
diff changeset
257 ift = (ift->ifa_next = ift + 1);
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jlarmour
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diff changeset
258 }
1219
f2d548ecdbde Be more careful with allocated space, etc. in getifaddrs()
gthomas
parents: 1010
diff changeset
259 free(buf);
208
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diff changeset
260
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
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diff changeset
261 if (--ift >= ifa) {
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jlarmour
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diff changeset
262 ift->ifa_next = NULL;
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jlarmour
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diff changeset
263 *pif = ifa;
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jlarmour
parents:
diff changeset
264 } else {
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diff changeset
265 *pif = NULL;
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diff changeset
266 free(ifa);
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
267 }
1007
16d247bb9c70 * src/ifaddrs.c (getifaddrs): Fill in flags, netmask and broadcast
asl
parents: 957
diff changeset
268 #ifdef CYGPKG_NET_INET6
16d247bb9c70 * src/ifaddrs.c (getifaddrs): Fill in flags, netmask and broadcast
asl
parents: 957
diff changeset
269 close(sock6);
16d247bb9c70 * src/ifaddrs.c (getifaddrs): Fill in flags, netmask and broadcast
asl
parents: 957
diff changeset
270 #endif
16d247bb9c70 * src/ifaddrs.c (getifaddrs): Fill in flags, netmask and broadcast
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parents: 957
diff changeset
271 close(sock);
208
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diff changeset
272 return (0);
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jlarmour
parents:
diff changeset
273 }
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diff changeset
274
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jlarmour
parents:
diff changeset
275 void
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
276 freeifaddrs(struct ifaddrs *ifp)
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jlarmour
parents:
diff changeset
277 {
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jlarmour
parents:
diff changeset
278 free(ifp);
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
279 }
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
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280
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281 void
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282 _show_all_interfaces(void)
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283 {
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284 struct ifaddrs *iflist, *ifp;
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285 char addr[64];
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286 int indx;
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287
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288 if (getifaddrs(&iflist) < 0) {
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289 diag_printf("Can't get interface information!!\n");
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290 return;
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291 }
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292 ifp = iflist;
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293 while (ifp != (struct ifaddrs *)NULL) {
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294 if (ifp->ifa_addr->sa_family != AF_LINK) {
1007
16d247bb9c70 * src/ifaddrs.c (getifaddrs): Fill in flags, netmask and broadcast
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295 getnameinfo (ifp->ifa_addr, ifp->ifa_addr->sa_len, addr,
16d247bb9c70 * src/ifaddrs.c (getifaddrs): Fill in flags, netmask and broadcast
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296 sizeof(addr), 0, 0, NI_NUMERICHOST);
208
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297 diag_printf("%p - %s - %s\n", ifp, ifp->ifa_name, addr);
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298 }
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299 ifp = ifp->ifa_next;
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300 }
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301 indx = if_nametoindex(iflist->ifa_name);
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302 diag_printf("indx(%s) = %d\n", iflist->ifa_name, indx);
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303 if (indx > 0) {
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304 if (if_indextoname(indx, addr)) {
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305 diag_printf("index(%s) = %d/%s\n", iflist->ifa_name, indx, addr);
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306 } else {
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307 diag_printf("index(%s) = %d: %s\n", iflist->ifa_name, indx, strerror(errno));
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308 }
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309 } else {
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310 diag_printf("index(%s): %s\n", iflist->ifa_name, strerror(errno));
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311 }
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312 freeifaddrs(iflist);
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313 }
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314
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315 /*
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316 * From RFC 2553:
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317 *
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318 * 4.1 Name-to-Index
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319 *
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320 *
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321 * The first function maps an interface name into its corresponding
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322 * index.
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323 *
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324 * #include <net/if.h>
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325 *
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326 * unsigned int if_nametoindex(const char *ifname);
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327 *
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328 * If the specified interface name does not exist, the return value is
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329 * 0, and errno is set to ENXIO. If there was a system error (such as
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330 * running out of memory), the return value is 0 and errno is set to the
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331 * proper value (e.g., ENOMEM).
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332 */
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333
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334 unsigned int
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335 if_nametoindex(const char *ifname)
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336 {
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337 struct ifaddrs *ifaddrs, *ifa;
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338 unsigned int ni;
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339
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340 if (getifaddrs(&ifaddrs) < 0)
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341 return(0);
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342
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343 ni = 0;
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344
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345 for (ifa = ifaddrs; ifa != NULL; ifa = ifa->ifa_next) {
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346 if (ifa->ifa_addr &&
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347 ifa->ifa_addr->sa_family == AF_LINK &&
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348 strcmp(ifa->ifa_name, ifname) == 0) {
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349 ni = ((struct sockaddr_dl*)ifa->ifa_addr)->sdl_index;
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350 break;
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351 }
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352 }
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353
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354 freeifaddrs(ifaddrs);
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355 if (!ni)
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356 errno = ENXIO;
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357 return(ni);
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358 }
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359
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360 /*
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361 * From RFC 2533:
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362 *
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363 * The second function maps an interface index into its corresponding
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364 * name.
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365 *
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366 * #include <net/if.h>
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367 *
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368 * char *if_indextoname(unsigned int ifindex, char *ifname);
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369 *
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370 * The ifname argument must point to a buffer of at least IF_NAMESIZE
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371 * bytes into which the interface name corresponding to the specified
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372 * index is returned. (IF_NAMESIZE is also defined in <net/if.h> and
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373 * its value includes a terminating null byte at the end of the
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374 * interface name.) This pointer is also the return value of the
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375 * function. If there is no interface corresponding to the specified
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376 * index, NULL is returned, and errno is set to ENXIO, if there was a
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377 * system error (such as running out of memory), if_indextoname returns
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378 * NULL and errno would be set to the proper value (e.g., ENOMEM).
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379 */
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380
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381 char *
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382 if_indextoname(unsigned int ifindex, char *ifname)
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383 {
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384 struct ifaddrs *ifaddrs, *ifa;
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385 int error = 0;
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386
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387 if (getifaddrs(&ifaddrs) < 0)
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388 return(NULL); /* getifaddrs properly set errno */
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389
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390 for (ifa = ifaddrs; ifa != NULL; ifa = ifa->ifa_next) {
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391 if (ifa->ifa_addr &&
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392 ifa->ifa_addr->sa_family == AF_LINK &&
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393 ifindex == ((struct sockaddr_dl*)ifa->ifa_addr)->sdl_index)
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394 break;
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395 }
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396
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397 if (ifa == NULL) {
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398 error = ENXIO;
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399 ifname = NULL;
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400 }
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401 else
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402 strncpy(ifname, ifa->ifa_name, IFNAMSIZ);
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403
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404 freeifaddrs(ifaddrs);
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405
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406 errno = error;
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407 return(ifname);
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408 }