Mercurial > ecos-v3_0-branch
annotate packages/redboot/current/src/net/bootp.c @ 2863:7d8c61e6225c default tip
* Added execute permissions to files missed in conversion from CVS
| author | alexs |
|---|---|
| date | Thu, 26 Mar 2009 20:39:18 +0000 |
| parents | 74dbf4c3f2e1 |
| children |
| rev | line source |
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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 //========================================================================== |
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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, 2003 Free Software Foundation, 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 |
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16 // version. |
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17 // |
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18 // eCos is distributed in the hope that it will be useful, but WITHOUT |
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19 // ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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20 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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21 // for more details. |
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22 // |
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23 // You should have received a copy of the GNU General Public License |
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24 // along with eCos; if not, write to the Free Software Foundation, Inc., |
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25 // 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
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26 // |
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27 // As a special exception, if other files instantiate templates or use |
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28 // macros or inline functions from this file, or you compile this file |
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29 // and link it with other works to produce a work based on this file, |
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30 // this file does not by itself cause the resulting work to be covered by |
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31 // the GNU General Public License. However the source code for this file |
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32 // must still be made available in accordance with section (3) of the GNU |
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33 // General Public License v2. |
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34 // |
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35 // This exception does not invalidate any other reasons why a work based |
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36 // on this file might be covered by the GNU General Public License. |
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37 // ------------------------------------------- |
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38 // ####ECOSGPLCOPYRIGHTEND#### |
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39 //========================================================================== |
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40 //#####DESCRIPTIONBEGIN#### |
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41 // |
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42 // Author(s): gthomas |
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43 // Contributors: gthomas |
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44 // Date: 2000-07-14 |
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45 // Purpose: |
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46 // Description: |
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47 // |
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48 // This code is part of RedBoot (tm). |
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49 // |
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50 //####DESCRIPTIONEND#### |
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51 // |
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52 //========================================================================== |
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53 |
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54 #include <redboot.h> |
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55 #include <net/net.h> |
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56 #include <net/bootp.h> |
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57 |
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58 #define SHOULD_BE_RANDOM 0x12345555 |
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59 |
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60 /* How many milliseconds to wait before retrying the request */ |
| 1245 | 61 #define RETRY_TIME 2000 |
| 62 #define MAX_RETRIES 8 | |
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63 |
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64 static bootp_header_t *bp_info; |
| 231 | 65 |
| 1227 | 66 #ifdef CYGSEM_REDBOOT_NETWORKING_DHCP |
| 231 | 67 static const unsigned char dhcpCookie[] = {99,130,83,99}; |
| 1227 | 68 static const unsigned char dhcpEnd[] = {255}; |
| 69 static const unsigned char dhcpDiscover[] = {53,1,1}; | |
| 70 static const unsigned char dhcpRequest[] = {53,1,3}; | |
| 71 static const unsigned char dhcpRequestIP[] = {50,4}; | |
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72 static const unsigned char dhcpParamRequestList[] = {55,3,1,3,6}; |
| 1227 | 73 static enum { |
| 74 DHCP_NONE = 0, | |
| 75 DHCP_DISCOVER, | |
| 76 DHCP_OFFER, | |
| 77 DHCP_REQUEST, | |
| 78 DHCP_ACK | |
| 79 } dhcpState; | |
| 231 | 80 #endif |
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81 |
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82 static void |
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83 bootp_handler(udp_socket_t *skt, char *buf, int len, |
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84 ip_route_t *src_route, word src_port) |
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85 { |
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86 bootp_header_t *b; |
| 1227 | 87 #ifdef CYGSEM_REDBOOT_NETWORKING_DHCP |
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88 unsigned char *p, expected = 0; |
| 231 | 89 #endif |
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90 |
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91 b = (bootp_header_t *)buf; |
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92 if (bp_info) { |
| 231 | 93 memset(bp_info,0,sizeof *bp_info); |
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94 if (len > sizeof *bp_info) |
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95 len = sizeof *bp_info; |
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96 memcpy(bp_info, b, len); |
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97 } |
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98 |
| 231 | 99 // Only accept pure REPLY responses |
| 100 if (b->bp_op != BOOTREPLY) | |
| 101 return; | |
| 102 | |
| 103 // Must be sent to me, as well! | |
| 104 if (memcmp(b->bp_chaddr, __local_enet_addr, 6)) | |
| 105 return; | |
| 106 | |
| 1227 | 107 #ifdef CYGSEM_REDBOOT_NETWORKING_DHCP |
| 108 p = b->bp_vend; | |
| 109 if (memcmp(p, dhcpCookie, sizeof(dhcpCookie))) | |
| 231 | 110 return; |
| 1227 | 111 p += 4; |
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112 |
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113 // Find the DHCP Message Type tag |
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114 while (*p != TAG_DHCP_MESS_TYPE) { |
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115 p += p[1] + 2; |
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116 if (p >= (unsigned char*)b + sizeof(*bp_info)) |
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117 return; |
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118 } |
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119 |
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120 p += 2; |
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121 |
| 1227 | 122 switch (dhcpState) { |
| 123 case DHCP_DISCOVER: | |
| 124 // The discover message has been sent, only accept an offer reply | |
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125 if (*p == DHCP_MESS_TYPE_OFFER) { |
| 1227 | 126 dhcpState = DHCP_OFFER; |
| 127 return; | |
| 128 } else { | |
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129 expected = DHCP_MESS_TYPE_OFFER; |
| 231 | 130 } |
| 1227 | 131 break; |
| 132 case DHCP_REQUEST: | |
| 133 // The request message has been sent, only accept an ack reply | |
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134 if (*p == DHCP_MESS_TYPE_ACK) { |
| 1227 | 135 dhcpState = DHCP_ACK; |
| 136 return; | |
| 137 } else { | |
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138 expected = DHCP_MESS_TYPE_ACK; |
| 1227 | 139 } |
| 140 break; | |
| 141 case DHCP_NONE: | |
| 142 case DHCP_OFFER: | |
| 143 case DHCP_ACK: | |
| 1245 | 144 // Quitely ignore these - they indicate repeated message from server |
| 145 return; | |
| 146 } | |
| 147 // See if we've been NAK'd - if so, give up and try again | |
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148 if (*p == DHCP_MESS_TYPE_NAK) { |
| 1245 | 149 dhcpState = DHCP_NONE; |
| 1227 | 150 return; |
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151 } |
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152 diag_printf("DHCP reply: %d, not %d\n", (int)*p, (int)expected); |
| 1227 | 153 return; |
| 154 #else | |
| 155 // Simple BOOTP - this is all there is! | |
| 156 memcpy(__local_ip_addr, &b->bp_yiaddr, 4); | |
| 231 | 157 #endif |
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158 } |
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159 |
| 231 | 160 #define AddOption(p,d) do {memcpy(p,d,sizeof d); p += sizeof d;} while (0) |
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161 |
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162 /* |
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163 * Find our IP address and copy to __local_ip_addr. |
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164 * Return zero if successful, -1 if not. |
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165 */ |
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166 int |
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167 __bootp_find_local_ip(bootp_header_t *info) |
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168 { |
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169 udp_socket_t udp_skt; |
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170 bootp_header_t b; |
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171 ip_route_t r; |
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172 int retry; |
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173 unsigned long start; |
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174 ip_addr_t saved_ip_addr; |
| 1227 | 175 #ifdef CYGSEM_REDBOOT_NETWORKING_DHCP |
| 231 | 176 unsigned char *p; |
| 1245 | 177 int oldState; |
| 231 | 178 #endif |
| 179 int txSize; | |
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180 bool abort = false; |
| 1227 | 181 static int xid = SHOULD_BE_RANDOM; |
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182 |
| 1227 | 183 #ifdef CYGSEM_REDBOOT_NETWORKING_DHCP |
| 184 dhcpState = DHCP_NONE; | |
| 231 | 185 #endif |
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186 |
| 1227 | 187 // Where we want the results saved |
| 188 bp_info = info; | |
| 189 // Preserve any IP address we currently have, just in case | |
| 190 memcpy(saved_ip_addr, __local_ip_addr, sizeof(__local_ip_addr)); | |
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191 |
| 1227 | 192 // fill out route for a broadcast |
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193 r.ip_addr[0] = 255; |
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194 r.ip_addr[1] = 255; |
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195 r.ip_addr[2] = 255; |
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196 r.ip_addr[3] = 255; |
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197 r.enet_addr[0] = 255; |
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198 r.enet_addr[1] = 255; |
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199 r.enet_addr[2] = 255; |
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200 r.enet_addr[3] = 255; |
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201 r.enet_addr[4] = 255; |
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202 r.enet_addr[5] = 255; |
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203 |
| 1227 | 204 // setup a socket listener for bootp replies |
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205 __udp_install_listener(&udp_skt, IPPORT_BOOTPC, bootp_handler); |
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206 |
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207 retry = MAX_RETRIES; |
| 1886 | 208 do { |
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209 start = MS_TICKS(); |
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210 |
| 1227 | 211 // Build up the BOOTP/DHCP request |
| 212 memset(&b, 0, sizeof(b)); | |
| 213 b.bp_op = BOOTREQUEST; | |
| 214 b.bp_htype = HTYPE_ETHERNET; | |
| 215 b.bp_hlen = 6; | |
| 216 b.bp_xid = xid++; | |
| 217 memcpy(b.bp_chaddr, __local_enet_addr, 6); | |
| 218 memset(__local_ip_addr, 0, sizeof(__local_ip_addr)); | |
| 219 | |
| 220 #ifdef CYGSEM_REDBOOT_NETWORKING_DHCP | |
| 221 p = b.bp_vend; | |
| 222 switch (dhcpState) { | |
| 223 case DHCP_NONE: | |
| 1242 | 224 case DHCP_DISCOVER: |
| 1227 | 225 AddOption(p,dhcpCookie); |
| 226 AddOption(p,dhcpDiscover); | |
| 227 AddOption(p,dhcpParamRequestList); | |
| 228 AddOption(p,dhcpEnd); | |
| 229 dhcpState = DHCP_DISCOVER; | |
| 230 break; | |
| 231 case DHCP_OFFER: | |
| 1243 | 232 retry = MAX_RETRIES; |
| 1242 | 233 case DHCP_REQUEST: |
| 1245 | 234 b.bp_xid = bp_info->bp_xid; // Match what server sent |
| 1227 | 235 AddOption(p,dhcpCookie); |
| 236 AddOption(p,dhcpRequest); | |
| 237 AddOption(p,dhcpRequestIP); | |
| 238 memcpy(p, &bp_info->bp_yiaddr, 4); p += 4; // Ask for the address just given | |
| 239 AddOption(p,dhcpParamRequestList); | |
| 240 AddOption(p,dhcpEnd); | |
| 241 dhcpState = DHCP_REQUEST; | |
| 242 memset(&b.bp_yiaddr, 0xFF, 4); | |
| 243 memset(&b.bp_siaddr, 0xFF, 4); | |
| 1245 | 244 memset(&b.bp_yiaddr, 0x00, 4); |
| 245 memset(&b.bp_siaddr, 0x00, 4); | |
| 1227 | 246 break; |
| 1246 | 247 case DHCP_ACK: |
| 248 // Ignore these states (they won't happen) | |
| 249 break; | |
| 1227 | 250 } |
| 251 | |
| 252 // Some servers insist on a minimum amount of "vendor" data | |
| 253 if (p < &b.bp_vend[BP_MIN_VEND_SIZE]) p = &b.bp_vend[BP_MIN_VEND_SIZE]; | |
| 254 txSize = p - (unsigned char*)&b; | |
| 1245 | 255 oldState = dhcpState; |
| 1227 | 256 #else |
| 257 txSize = sizeof(b); | |
| 258 #endif | |
| 259 | |
| 231 | 260 __udp_send((char *)&b, txSize, &r, IPPORT_BOOTPS, IPPORT_BOOTPC); |
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261 |
| 1886 | 262 // If we're retrying, inform the user |
| 263 if (retry == (MAX_RETRIES-1)) | |
| 264 diag_printf("... waiting for BOOTP information\n"); | |
| 265 | |
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266 do { |
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267 __enet_poll(); |
| 1227 | 268 #ifdef CYGSEM_REDBOOT_NETWORKING_DHCP |
| 1245 | 269 if (dhcpState != oldState) { |
| 270 if (dhcpState == DHCP_ACK) { | |
| 271 unsigned char *end; | |
| 272 int optlen; | |
| 273 // Address information has now arrived! | |
| 274 memcpy(__local_ip_addr, &bp_info->bp_yiaddr, 4); | |
| 1227 | 275 #ifdef CYGSEM_REDBOOT_NETWORKING_USE_GATEWAY |
| 1245 | 276 memcpy(__local_ip_gate, &bp_info->bp_giaddr, 4); |
| 1227 | 277 #endif |
| 1245 | 278 p = bp_info->bp_vend+4; |
| 279 end = (unsigned char *)bp_info+sizeof(*bp_info); | |
| 280 while (p < end) { | |
| 281 unsigned char tag = *p; | |
| 282 if (tag == TAG_END) | |
| 1227 | 283 break; |
| 1245 | 284 if (tag == TAG_PAD) |
| 285 optlen = 1; | |
| 286 else { | |
| 287 optlen = p[1]; | |
| 288 p += 2; | |
| 289 switch (tag) { | |
| 1288 | 290 #ifdef CYGSEM_REDBOOT_NETWORKING_USE_GATEWAY |
| 1245 | 291 case TAG_SUBNET_MASK: // subnet mask |
| 292 memcpy(__local_ip_mask,p,4); | |
| 293 break; | |
| 294 case TAG_GATEWAY: // router | |
| 295 memcpy(__local_ip_gate,p,4); | |
| 296 break; | |
| 1227 | 297 #endif |
| 1357 | 298 #ifdef CYGPKG_REDBOOT_NETWORKING_DNS |
| 299 case TAG_DOMAIN_SERVER: | |
| 1396 | 300 // diag_printf(" DNS server found!\n"); |
| 1357 | 301 memcpy(&__bootp_dns_addr, p, 4); |
| 302 __bootp_dns_set = 1; | |
| 303 break; | |
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304 #ifdef CYGPKG_REDBOOT_NETWORKING_DNS_DHCP_DOMAIN |
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305 case TAG_DOMAIN_NAME: |
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306 if(optlen < sizeof(__bootp_dns_domain)) { |
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307 memcpy(__bootp_dns_domain, p, optlen); |
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308 __bootp_dns_domain[optlen] = '\0'; |
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309 __bootp_dns_domain_set = 1; |
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310 } else { |
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311 diag_printf("DNS domain name too long\n"); |
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312 } |
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313 break; |
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314 #endif //CYGPKG_REDBOOT_NETWORKING_DNS_DHCP_DOMAIN |
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315 #endif //CYGPKG_REDBOOT_NETWORKING_DNS |
| 1245 | 316 default: |
| 317 break; | |
| 318 } | |
| 1227 | 319 } |
| 1245 | 320 p += optlen; |
| 1227 | 321 } |
| 1245 | 322 __udp_remove_listener(IPPORT_BOOTPC); |
| 323 return 0; | |
| 324 } else { | |
| 325 break; // State changed, handle it | |
| 1227 | 326 } |
| 327 } | |
| 328 #else | |
| 329 // All done, if address response has arrived | |
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330 if (__local_ip_addr[0] || __local_ip_addr[1] || |
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331 __local_ip_addr[2] || __local_ip_addr[3]) { |
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332 /* success */ |
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333 __udp_remove_listener(IPPORT_BOOTPC); |
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334 return 0; |
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335 } |
| 1227 | 336 #endif |
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337 if (_rb_break(1)) { |
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338 // The user typed ^C on the console |
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339 abort = true; |
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340 break; |
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341 } |
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342 MS_TICKS_DELAY(); // Count for ^C test |
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343 } while ((MS_TICKS_DELAY() - start) < RETRY_TIME); |
| 1886 | 344 } while (!abort && (retry-- > 0)); |
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345 |
| 1227 | 346 // timed out |
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347 __udp_remove_listener(IPPORT_BOOTPC); |
| 1227 | 348 // Restore any previous IP address |
| 349 memcpy(__local_ip_addr, saved_ip_addr, sizeof(__local_ip_addr)); | |
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350 return -1; |
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351 } |
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352 |
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353 |
