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annotate packages/redboot/current/src/net/bootp.c @ 208:e0c0827131d1 ecos

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Merge from eCos master repository on 2002-05-20-20:11:54-BST
author jlarmour
date Mon, 20 May 2002 22:19:26 +0000
parents 022f1e506033
children d2c90368aeef
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1 //==========================================================================
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2 //
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3 // net/bootp.c
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4 //
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5 // Stand-alone minimal BOOTP support for RedBoot
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6 //
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7 //==========================================================================
208
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8 //####ECOSGPLCOPYRIGHTBEGIN####
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9 // -------------------------------------------
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10 // This file is part of eCos, the Embedded Configurable Operating System.
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11 // Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
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12 //
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13 // eCos is free software; you can redistribute it and/or modify it under
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14 // the terms of the GNU General Public License as published by the Free
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15 // Software Foundation; either version 2 or (at your option) any later version.
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16 //
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17 // eCos is distributed in the hope that it will be useful, but WITHOUT ANY
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18 // WARRANTY; without even the implied warranty of MERCHANTABILITY or
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19 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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20 // for more details.
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21 //
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22 // You should have received a copy of the GNU General Public License along
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23 // with eCos; if not, write to the Free Software Foundation, Inc.,
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24 // 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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25 //
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26 // As a special exception, if other files instantiate templates or use macros
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27 // or inline functions from this file, or you compile this file and link it
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28 // with other works to produce a work based on this file, this file does not
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29 // by itself cause the resulting work to be covered by the GNU General Public
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30 // License. However the source code for this file must still be made available
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31 // in accordance with section (3) of the GNU General Public License.
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32 //
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33 // This exception does not invalidate any other reasons why a work based on
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34 // this file might be covered by the GNU General Public License.
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35 //
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36 // Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
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37 // at http://sources.redhat.com/ecos/ecos-license
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38 // -------------------------------------------
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39 //####ECOSGPLCOPYRIGHTEND####
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40 //==========================================================================
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41 //#####DESCRIPTIONBEGIN####
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42 //
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43 // Author(s): gthomas
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44 // Contributors: gthomas
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45 // Date: 2000-07-14
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46 // Purpose:
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47 // Description:
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48 //
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49 // This code is part of RedBoot (tm).
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50 //
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51 //####DESCRIPTIONEND####
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52 //
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53 //==========================================================================
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54
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55 #include <redboot.h>
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56 #include <net/net.h>
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57 #include <net/bootp.h>
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58
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59 extern int net_debug;
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60
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61 #define SHOULD_BE_RANDOM 0x12345555
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62
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63 /* How many milliseconds to wait before retrying the request */
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64 #define RETRY_TIME 1000
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65 #define MAX_RETRIES 30
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66
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67 static bootp_header_t *bp_info;
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68
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69 static void
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70 bootp_handler(udp_socket_t *skt, char *buf, int len,
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71 ip_route_t *src_route, word src_port)
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72 {
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73 bootp_header_t *b;
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74
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75 b = (bootp_header_t *)buf;
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76 if (bp_info) {
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77 if (len > sizeof *bp_info)
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78 len = sizeof *bp_info;
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79 memcpy(bp_info, b, len);
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80 }
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81
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82 if (b->bp_op == BOOTREPLY &&
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83 !memcmp(b->bp_chaddr, __local_enet_addr, 6)) {
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84 memcpy(__local_ip_addr, &b->bp_yiaddr, 4);
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85 }
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86 }
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87
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88
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89 /*
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90 * Find our IP address and copy to __local_ip_addr.
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91 * Return zero if successful, -1 if not.
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92 */
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93 int
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94 __bootp_find_local_ip(bootp_header_t *info)
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95 {
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96 udp_socket_t udp_skt;
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97 bootp_header_t b;
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98 ip_route_t r;
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99 int retry;
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100 unsigned long start;
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101 ip_addr_t saved_ip_addr;
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102
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103 bp_info = info;
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104
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105 memset(&b, 0, sizeof(b));
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106
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107 b.bp_op = BOOTREQUEST;
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108 b.bp_htype = HTYPE_ETHERNET;
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109 b.bp_hlen = 6;
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110 b.bp_xid = SHOULD_BE_RANDOM;
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111
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112 memcpy( saved_ip_addr, __local_ip_addr, sizeof(__local_ip_addr) );
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113 memset( __local_ip_addr, 0, sizeof(__local_ip_addr) );
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114
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115 memcpy(b.bp_chaddr, __local_enet_addr, 6);
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116
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117 /* fill out route for a broadcast */
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118 r.ip_addr[0] = 255;
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119 r.ip_addr[1] = 255;
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120 r.ip_addr[2] = 255;
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121 r.ip_addr[3] = 255;
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122 r.enet_addr[0] = 255;
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123 r.enet_addr[1] = 255;
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124 r.enet_addr[2] = 255;
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125 r.enet_addr[3] = 255;
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126 r.enet_addr[4] = 255;
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127 r.enet_addr[5] = 255;
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128
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129 /* setup a socket listener for bootp replies */
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130 __udp_install_listener(&udp_skt, IPPORT_BOOTPC, bootp_handler);
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131
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132 retry = MAX_RETRIES;
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133 while (retry-- > 0) {
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134 start = MS_TICKS();
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135
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136 __udp_send((char *)&b, sizeof(b), &r, IPPORT_BOOTPS, IPPORT_BOOTPC);
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137
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138 do {
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139 __enet_poll();
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140 if (__local_ip_addr[0] || __local_ip_addr[1] ||
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141 __local_ip_addr[2] || __local_ip_addr[3]) {
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142 /* success */
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143 __udp_remove_listener(IPPORT_BOOTPC);
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144 return 0;
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145 }
151
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146 } while ((MS_TICKS_DELAY() - start) < RETRY_TIME);
115
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147 }
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148
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149 /* timed out */
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150 __udp_remove_listener(IPPORT_BOOTPC);
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151 net_debug = 0;
165
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152 memcpy( __local_ip_addr, saved_ip_addr, sizeof(__local_ip_addr) );
115
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153 return -1;
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154 }
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155
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156