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1 /* |
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2 * libslirp glue |
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3 * |
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4 * Copyright (c) 2004-2008 Fabrice Bellard |
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5 * |
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6 * Permission is hereby granted, free of charge, to any person obtaining a copy |
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7 * of this software and associated documentation files (the "Software"), to deal |
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8 * in the Software without restriction, including without limitation the rights |
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9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
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10 * copies of the Software, and to permit persons to whom the Software is |
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11 * furnished to do so, subject to the following conditions: |
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12 * |
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13 * The above copyright notice and this permission notice shall be included in |
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14 * all copies or substantial portions of the Software. |
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15 * |
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16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
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19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
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21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
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22 * THE SOFTWARE. |
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23 */ |
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24 #include "slirp.h" |
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25 |
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26 /* host address */ |
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27 struct in_addr our_addr; |
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28 /* host dns address */ |
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29 struct in_addr dns_addr; |
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30 /* host loopback address */ |
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31 struct in_addr loopback_addr; |
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32 |
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33 /* address for slirp virtual addresses */ |
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34 struct in_addr special_addr; |
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35 /* virtual address alias for host */ |
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36 struct in_addr alias_addr; |
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37 |
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38 static const uint8_t special_ethaddr[6] = { |
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39 0x52, 0x54, 0x00, 0x12, 0x35, 0x00 |
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40 }; |
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41 |
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42 /* ARP cache for the guest IP addresses (XXX: allow many entries) */ |
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43 uint8_t client_ethaddr[6]; |
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44 static struct in_addr client_ipaddr; |
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45 |
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46 static const uint8_t zero_ethaddr[6] = { 0, 0, 0, 0, 0, 0 }; |
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47 |
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48 int do_slowtimo; |
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49 int link_up; |
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50 struct timeval tt; |
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51 FILE *lfd; |
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52 struct ex_list *exec_list; |
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53 |
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54 /* XXX: suppress those select globals */ |
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55 fd_set *global_readfds, *global_writefds, *global_xfds; |
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56 |
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57 char slirp_hostname[33]; |
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58 |
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59 #ifdef _WIN32 |
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60 |
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61 static int get_dns_addr(struct in_addr *pdns_addr) |
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62 { |
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63 FIXED_INFO *FixedInfo=NULL; |
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64 ULONG BufLen; |
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65 DWORD ret; |
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66 IP_ADDR_STRING *pIPAddr; |
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67 struct in_addr tmp_addr; |
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68 |
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69 FixedInfo = (FIXED_INFO *)GlobalAlloc(GPTR, sizeof(FIXED_INFO)); |
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70 BufLen = sizeof(FIXED_INFO); |
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71 |
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72 if (ERROR_BUFFER_OVERFLOW == GetNetworkParams(FixedInfo, &BufLen)) { |
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73 if (FixedInfo) { |
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74 GlobalFree(FixedInfo); |
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75 FixedInfo = NULL; |
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76 } |
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77 FixedInfo = GlobalAlloc(GPTR, BufLen); |
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78 } |
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79 |
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80 if ((ret = GetNetworkParams(FixedInfo, &BufLen)) != ERROR_SUCCESS) { |
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81 printf("GetNetworkParams failed. ret = %08x\n", (u_int)ret ); |
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82 if (FixedInfo) { |
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83 GlobalFree(FixedInfo); |
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84 FixedInfo = NULL; |
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85 } |
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86 return -1; |
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87 } |
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88 |
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89 pIPAddr = &(FixedInfo->DnsServerList); |
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90 inet_aton(pIPAddr->IpAddress.String, &tmp_addr); |
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91 *pdns_addr = tmp_addr; |
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92 #if 0 |
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93 printf( "DNS Servers:\n" ); |
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94 printf( "DNS Addr:%s\n", pIPAddr->IpAddress.String ); |
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95 |
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96 pIPAddr = FixedInfo -> DnsServerList.Next; |
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97 while ( pIPAddr ) { |
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98 printf( "DNS Addr:%s\n", pIPAddr ->IpAddress.String ); |
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99 pIPAddr = pIPAddr ->Next; |
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100 } |
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101 #endif |
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102 if (FixedInfo) { |
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103 GlobalFree(FixedInfo); |
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104 FixedInfo = NULL; |
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105 } |
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106 return 0; |
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107 } |
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108 |
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109 #else |
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110 |
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111 static int get_dns_addr(struct in_addr *pdns_addr) |
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112 { |
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113 char buff[512]; |
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114 char buff2[257]; |
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115 FILE *f; |
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116 int found = 0; |
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117 struct in_addr tmp_addr; |
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118 |
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119 f = fopen("/etc/resolv.conf", "r"); |
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120 if (!f) |
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121 return -1; |
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122 |
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123 #ifdef DEBUG |
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124 lprint("IP address of your DNS(s): "); |
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125 #endif |
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126 while (fgets(buff, 512, f) != NULL) { |
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127 if (sscanf(buff, "nameserver%*[ \t]%256s", buff2) == 1) { |
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128 if (!inet_aton(buff2, &tmp_addr)) |
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129 continue; |
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130 if (tmp_addr.s_addr == loopback_addr.s_addr) |
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131 tmp_addr = our_addr; |
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132 /* If it's the first one, set it to dns_addr */ |
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133 if (!found) |
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134 *pdns_addr = tmp_addr; |
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135 #ifdef DEBUG |
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136 else |
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137 lprint(", "); |
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138 #endif |
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139 if (++found > 3) { |
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140 #ifdef DEBUG |
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141 lprint("(more)"); |
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142 #endif |
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143 break; |
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144 } |
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145 #ifdef DEBUG |
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146 else |
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147 lprint("%s", inet_ntoa(tmp_addr)); |
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148 #endif |
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149 } |
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150 } |
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151 fclose(f); |
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152 if (!found) |
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153 return -1; |
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154 return 0; |
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155 } |
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156 |
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157 #endif |
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158 |
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159 #ifdef _WIN32 |
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160 static void slirp_cleanup(void) |
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161 { |
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162 WSACleanup(); |
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163 } |
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164 #endif |
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165 |
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166 void slirp_init(void) |
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167 { |
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168 // debug_init("/tmp/slirp.log", DEBUG_DEFAULT); |
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169 |
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170 #ifdef _WIN32 |
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171 { |
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172 WSADATA Data; |
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173 WSAStartup(MAKEWORD(2,0), &Data); |
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174 atexit(slirp_cleanup); |
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175 } |
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176 #endif |
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177 |
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178 link_up = 1; |
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179 |
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180 if_init(); |
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181 ip_init(); |
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182 |
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183 /* Initialise mbufs *after* setting the MTU */ |
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184 m_init(); |
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185 |
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186 /* set default addresses */ |
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187 inet_aton("127.0.0.1", &loopback_addr); |
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188 |
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189 if (get_dns_addr(&dns_addr) < 0) { |
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190 dns_addr = loopback_addr; |
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191 fprintf (stderr, "Warning: No DNS servers found\n"); |
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192 } |
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193 |
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194 inet_aton(CTL_SPECIAL, &special_addr); |
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195 alias_addr.s_addr = special_addr.s_addr | htonl(CTL_ALIAS); |
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196 getouraddr(); |
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197 } |
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198 |
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199 #define CONN_CANFSEND(so) (((so)->so_state & (SS_FCANTSENDMORE|SS_ISFCONNECTED)) == SS_ISFCONNECTED) |
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200 #define CONN_CANFRCV(so) (((so)->so_state & (SS_FCANTRCVMORE|SS_ISFCONNECTED)) == SS_ISFCONNECTED) |
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201 #define UPD_NFDS(x) if (nfds < (x)) nfds = (x) |
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202 |
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203 /* |
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204 * curtime kept to an accuracy of 1ms |
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205 */ |
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206 #ifdef _WIN32 |
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207 static void updtime(void) |
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208 { |
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209 struct _timeb tb; |
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210 |
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211 _ftime(&tb); |
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212 curtime = (u_int)tb.time * (u_int)1000; |
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213 curtime += (u_int)tb.millitm; |
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214 } |
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215 #else |
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216 static void updtime(void) |
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217 { |
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218 gettimeofday(&tt, 0); |
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219 |
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220 curtime = (u_int)tt.tv_sec * (u_int)1000; |
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221 curtime += (u_int)tt.tv_usec / (u_int)1000; |
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222 |
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223 if ((tt.tv_usec % 1000) >= 500) |
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224 curtime++; |
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225 } |
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226 #endif |
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227 |
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228 void slirp_select_fill(int *pnfds, |
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229 fd_set *readfds, fd_set *writefds, fd_set *xfds) |
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230 { |
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231 struct socket *so, *so_next; |
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232 struct timeval timeout; |
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233 int nfds; |
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234 int tmp_time; |
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235 |
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236 /* fail safe */ |
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237 global_readfds = NULL; |
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238 global_writefds = NULL; |
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239 global_xfds = NULL; |
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240 |
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241 nfds = *pnfds; |
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242 /* |
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243 * First, TCP sockets |
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244 */ |
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245 do_slowtimo = 0; |
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246 if (link_up) { |
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247 /* |
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248 * *_slowtimo needs calling if there are IP fragments |
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249 * in the fragment queue, or there are TCP connections active |
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250 */ |
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251 do_slowtimo = ((tcb.so_next != &tcb) || |
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252 ((struct ipasfrag *)&ipq != (struct ipasfrag *)ipq.next)); |
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253 |
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254 for (so = tcb.so_next; so != &tcb; so = so_next) { |
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255 so_next = so->so_next; |
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256 |
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257 /* |
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258 * See if we need a tcp_fasttimo |
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259 */ |
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260 if (time_fasttimo == 0 && so->so_tcpcb->t_flags & TF_DELACK) |
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261 time_fasttimo = curtime; /* Flag when we want a fasttimo */ |
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262 |
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263 /* |
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264 * NOFDREF can include still connecting to local-host, |
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265 * newly socreated() sockets etc. Don't want to select these. |
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266 */ |
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267 if (so->so_state & SS_NOFDREF || so->s == -1) |
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268 continue; |
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269 |
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270 /* |
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271 * Set for reading sockets which are accepting |
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272 */ |
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273 if (so->so_state & SS_FACCEPTCONN) { |
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274 FD_SET(so->s, readfds); |
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275 UPD_NFDS(so->s); |
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276 continue; |
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277 } |
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278 |
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279 /* |
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280 * Set for writing sockets which are connecting |
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281 */ |
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282 if (so->so_state & SS_ISFCONNECTING) { |
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283 FD_SET(so->s, writefds); |
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284 UPD_NFDS(so->s); |
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285 continue; |
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286 } |
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287 |
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288 /* |
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289 * Set for writing if we are connected, can send more, and |
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290 * we have something to send |
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291 */ |
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292 if (CONN_CANFSEND(so) && so->so_rcv.sb_cc) { |
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293 FD_SET(so->s, writefds); |
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294 UPD_NFDS(so->s); |
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295 } |
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296 |
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297 /* |
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298 * Set for reading (and urgent data) if we are connected, can |
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299 * receive more, and we have room for it XXX /2 ? |
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300 */ |
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301 if (CONN_CANFRCV(so) && (so->so_snd.sb_cc < (so->so_snd.sb_datalen/2))) { |
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302 FD_SET(so->s, readfds); |
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303 FD_SET(so->s, xfds); |
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304 UPD_NFDS(so->s); |
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305 } |
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306 } |
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307 |
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308 /* |
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309 * UDP sockets |
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310 */ |
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311 for (so = udb.so_next; so != &udb; so = so_next) { |
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312 so_next = so->so_next; |
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313 |
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314 /* |
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315 * See if it's timed out |
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316 */ |
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317 if (so->so_expire) { |
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318 if (so->so_expire <= curtime) { |
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319 udp_detach(so); |
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320 continue; |
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321 } else |
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322 do_slowtimo = 1; /* Let socket expire */ |
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323 } |
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324 |
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325 /* |
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326 * When UDP packets are received from over the |
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327 * link, they're sendto()'d straight away, so |
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328 * no need for setting for writing |
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329 * Limit the number of packets queued by this session |
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330 * to 4. Note that even though we try and limit this |
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331 * to 4 packets, the session could have more queued |
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332 * if the packets needed to be fragmented |
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333 * (XXX <= 4 ?) |
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334 */ |
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335 if ((so->so_state & SS_ISFCONNECTED) && so->so_queued <= 4) { |
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336 FD_SET(so->s, readfds); |
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337 UPD_NFDS(so->s); |
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338 } |
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339 } |
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340 } |
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341 |
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342 /* |
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343 * Setup timeout to use minimum CPU usage, especially when idle |
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344 */ |
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345 |
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346 /* |
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347 * First, see the timeout needed by *timo |
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348 */ |
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349 timeout.tv_sec = 0; |
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350 timeout.tv_usec = -1; |
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351 /* |
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352 * If a slowtimo is needed, set timeout to 500ms from the last |
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353 * slow timeout. If a fast timeout is needed, set timeout within |
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354 * 200ms of when it was requested. |
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355 */ |
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356 if (do_slowtimo) { |
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357 /* XXX + 10000 because some select()'s aren't that accurate */ |
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358 timeout.tv_usec = ((500 - (curtime - last_slowtimo)) * 1000) + 10000; |
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359 if (timeout.tv_usec < 0) |
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360 timeout.tv_usec = 0; |
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361 else if (timeout.tv_usec > 510000) |
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362 timeout.tv_usec = 510000; |
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363 |
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364 /* Can only fasttimo if we also slowtimo */ |
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365 if (time_fasttimo) { |
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366 tmp_time = (200 - (curtime - time_fasttimo)) * 1000; |
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367 if (tmp_time < 0) |
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368 tmp_time = 0; |
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369 |
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370 /* Choose the smallest of the 2 */ |
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371 if (tmp_time < timeout.tv_usec) |
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372 timeout.tv_usec = (u_int)tmp_time; |
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373 } |
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374 } |
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375 *pnfds = nfds; |
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376 } |
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377 |
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378 void slirp_select_poll(fd_set *readfds, fd_set *writefds, fd_set *xfds) |
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379 { |
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380 struct socket *so, *so_next; |
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381 int ret; |
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382 |
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383 global_readfds = readfds; |
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384 global_writefds = writefds; |
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385 global_xfds = xfds; |
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386 |
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387 /* Update time */ |
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388 updtime(); |
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389 |
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390 /* |
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391 * See if anything has timed out |
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392 */ |
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393 if (link_up) { |
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394 if (time_fasttimo && ((curtime - time_fasttimo) >= 2)) { |
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395 tcp_fasttimo(); |
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396 time_fasttimo = 0; |
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397 } |
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398 if (do_slowtimo && ((curtime - last_slowtimo) >= 499)) { |
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399 ip_slowtimo(); |
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400 tcp_slowtimo(); |
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401 last_slowtimo = curtime; |
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402 } |
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403 } |
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404 |
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405 /* |
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406 * Check sockets |
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407 */ |
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408 if (link_up) { |
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409 /* |
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410 * Check TCP sockets |
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411 */ |
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412 for (so = tcb.so_next; so != &tcb; so = so_next) { |
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413 so_next = so->so_next; |
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414 |
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415 /* |
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416 * FD_ISSET is meaningless on these sockets |
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417 * (and they can crash the program) |
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418 */ |
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419 if (so->so_state & SS_NOFDREF || so->s == -1) |
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420 continue; |
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421 |
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422 /* |
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423 * Check for URG data |
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424 * This will soread as well, so no need to |
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425 * test for readfds below if this succeeds |
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426 */ |
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427 if (FD_ISSET(so->s, xfds)) |
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428 sorecvoob(so); |
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429 /* |
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430 * Check sockets for reading |
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431 */ |
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432 else if (FD_ISSET(so->s, readfds)) { |
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433 /* |
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434 * Check for incoming connections |
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435 */ |
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436 if (so->so_state & SS_FACCEPTCONN) { |
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437 tcp_connect(so); |
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438 continue; |
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439 } /* else */ |
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440 ret = soread(so); |
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441 |
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442 /* Output it if we read something */ |
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443 if (ret > 0) |
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444 tcp_output(sototcpcb(so)); |
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445 } |
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446 |
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447 /* |
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448 * Check sockets for writing |
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449 */ |
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450 if (FD_ISSET(so->s, writefds)) { |
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451 /* |
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452 * Check for non-blocking, still-connecting sockets |
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453 */ |
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454 if (so->so_state & SS_ISFCONNECTING) { |
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455 /* Connected */ |
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456 so->so_state &= ~SS_ISFCONNECTING; |
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457 |
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458 ret = send(so->s, &ret, 0, 0); |
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459 if (ret < 0) { |
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460 /* XXXXX Must fix, zero bytes is a NOP */ |
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461 if (errno == EAGAIN || errno == EWOULDBLOCK || |
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462 errno == EINPROGRESS || errno == ENOTCONN) |
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463 continue; |
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464 |
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465 /* else failed */ |
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466 so->so_state = SS_NOFDREF; |
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467 } |
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468 /* else so->so_state &= ~SS_ISFCONNECTING; */ |
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469 |
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470 /* |
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471 * Continue tcp_input |
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472 */ |
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473 tcp_input((struct mbuf *)NULL, sizeof(struct ip), so); |
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474 /* continue; */ |
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475 } else |
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476 ret = sowrite(so); |
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477 /* |
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478 * XXXXX If we wrote something (a lot), there |
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479 * could be a need for a window update. |
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480 * In the worst case, the remote will send |
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481 * a window probe to get things going again |
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482 */ |
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483 } |
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484 |
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485 /* |
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486 * Probe a still-connecting, non-blocking socket |
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487 * to check if it's still alive |
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488 */ |
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489 #ifdef PROBE_CONN |
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490 if (so->so_state & SS_ISFCONNECTING) { |
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491 ret = recv(so->s, (char *)&ret, 0,0); |
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492 |
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493 if (ret < 0) { |
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494 /* XXX */ |
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495 if (errno == EAGAIN || errno == EWOULDBLOCK || |
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496 errno == EINPROGRESS || errno == ENOTCONN) |
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497 continue; /* Still connecting, continue */ |
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498 |
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499 /* else failed */ |
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500 so->so_state = SS_NOFDREF; |
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501 |
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502 /* tcp_input will take care of it */ |
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503 } else { |
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504 ret = send(so->s, &ret, 0,0); |
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505 if (ret < 0) { |
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506 /* XXX */ |
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507 if (errno == EAGAIN || errno == EWOULDBLOCK || |
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508 errno == EINPROGRESS || errno == ENOTCONN) |
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509 continue; |
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510 /* else failed */ |
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511 so->so_state = SS_NOFDREF; |
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512 } else |
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513 so->so_state &= ~SS_ISFCONNECTING; |
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514 |
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515 } |
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516 tcp_input((struct mbuf *)NULL, sizeof(struct ip),so); |
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517 } /* SS_ISFCONNECTING */ |
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518 #endif |
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519 } |
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520 |
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521 /* |
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522 * Now UDP sockets. |
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523 * Incoming packets are sent straight away, they're not buffered. |
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524 * Incoming UDP data isn't buffered either. |
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525 */ |
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526 for (so = udb.so_next; so != &udb; so = so_next) { |
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527 so_next = so->so_next; |
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528 |
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529 if (so->s != -1 && FD_ISSET(so->s, readfds)) { |
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530 sorecvfrom(so); |
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531 } |
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532 } |
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533 } |
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534 |
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535 /* |
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536 * See if we can start outputting |
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537 */ |
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538 if (if_queued && link_up) |
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539 if_start(); |
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540 |
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541 /* clear global file descriptor sets. |
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542 * these reside on the stack in vl.c |
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543 * so they're unusable if we're not in |
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544 * slirp_select_fill or slirp_select_poll. |
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545 */ |
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546 global_readfds = NULL; |
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547 global_writefds = NULL; |
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548 global_xfds = NULL; |
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549 } |
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550 |
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551 #define ETH_ALEN 6 |
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552 #define ETH_HLEN 14 |
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553 |
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554 #define ETH_P_IP 0x0800 /* Internet Protocol packet */ |
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555 #define ETH_P_ARP 0x0806 /* Address Resolution packet */ |
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556 |
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557 #define ARPOP_REQUEST 1 /* ARP request */ |
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558 #define ARPOP_REPLY 2 /* ARP reply */ |
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559 |
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560 struct ethhdr |
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561 { |
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562 unsigned char h_dest[ETH_ALEN]; /* destination eth addr */ |
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563 unsigned char h_source[ETH_ALEN]; /* source ether addr */ |
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564 unsigned short h_proto; /* packet type ID field */ |
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565 }; |
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566 |
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567 struct arphdr |
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568 { |
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569 unsigned short ar_hrd; /* format of hardware address */ |
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570 unsigned short ar_pro; /* format of protocol address */ |
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571 unsigned char ar_hln; /* length of hardware address */ |
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572 unsigned char ar_pln; /* length of protocol address */ |
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573 unsigned short ar_op; /* ARP opcode (command) */ |
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574 |
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575 /* |
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576 * Ethernet looks like this : This bit is variable sized however... |
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577 */ |
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578 unsigned char ar_sha[ETH_ALEN]; /* sender hardware address */ |
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579 unsigned char ar_sip[4]; /* sender IP address */ |
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580 unsigned char ar_tha[ETH_ALEN]; /* target hardware address */ |
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581 unsigned char ar_tip[4]; /* target IP address */ |
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582 }; |
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583 |
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584 static void arp_input(const uint8_t *pkt, int pkt_len) |
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585 { |
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586 struct ethhdr *eh = (struct ethhdr *)pkt; |
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587 struct arphdr *ah = (struct arphdr *)(pkt + ETH_HLEN); |
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588 uint8_t arp_reply[ETH_HLEN + sizeof(struct arphdr)]; |
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589 struct ethhdr *reh = (struct ethhdr *)arp_reply; |
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590 struct arphdr *rah = (struct arphdr *)(arp_reply + ETH_HLEN); |
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591 int ar_op; |
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592 struct ex_list *ex_ptr; |
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593 |
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594 ar_op = ntohs(ah->ar_op); |
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595 switch(ar_op) { |
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596 case ARPOP_REQUEST: |
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597 if (!memcmp(ah->ar_tip, &special_addr, 3)) { |
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598 if (ah->ar_tip[3] == CTL_DNS || ah->ar_tip[3] == CTL_ALIAS) |
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599 goto arp_ok; |
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600 for (ex_ptr = exec_list; ex_ptr; ex_ptr = ex_ptr->ex_next) { |
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601 if (ex_ptr->ex_addr == ah->ar_tip[3]) |
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602 goto arp_ok; |
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603 } |
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604 return; |
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605 arp_ok: |
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606 /* XXX: make an ARP request to have the client address */ |
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607 memcpy(client_ethaddr, eh->h_source, ETH_ALEN); |
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608 |
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609 /* ARP request for alias/dns mac address */ |
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610 memcpy(reh->h_dest, pkt + ETH_ALEN, ETH_ALEN); |
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611 memcpy(reh->h_source, special_ethaddr, ETH_ALEN - 1); |
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612 reh->h_source[5] = ah->ar_tip[3]; |
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613 reh->h_proto = htons(ETH_P_ARP); |
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614 |
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615 rah->ar_hrd = htons(1); |
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616 rah->ar_pro = htons(ETH_P_IP); |
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617 rah->ar_hln = ETH_ALEN; |
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618 rah->ar_pln = 4; |
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619 rah->ar_op = htons(ARPOP_REPLY); |
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620 memcpy(rah->ar_sha, reh->h_source, ETH_ALEN); |
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621 memcpy(rah->ar_sip, ah->ar_tip, 4); |
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622 memcpy(rah->ar_tha, ah->ar_sha, ETH_ALEN); |
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623 memcpy(rah->ar_tip, ah->ar_sip, 4); |
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624 slirp_output(arp_reply, sizeof(arp_reply)); |
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625 } |
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626 break; |
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627 case ARPOP_REPLY: |
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628 /* reply to request of client mac address ? */ |
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629 if (!memcmp(client_ethaddr, zero_ethaddr, ETH_ALEN) && |
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630 !memcmp(ah->ar_sip, &client_ipaddr.s_addr, 4)) { |
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631 memcpy(client_ethaddr, ah->ar_sha, ETH_ALEN); |
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632 } |
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633 break; |
|
634 default: |
|
635 break; |
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636 } |
|
637 } |
|
638 |
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639 void slirp_input(const uint8_t *pkt, int pkt_len) |
|
640 { |
|
641 struct mbuf *m; |
|
642 int proto; |
|
643 |
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644 if (pkt_len < ETH_HLEN) |
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645 return; |
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646 |
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647 proto = ntohs(*(uint16_t *)(pkt + 12)); |
|
648 switch(proto) { |
|
649 case ETH_P_ARP: |
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650 arp_input(pkt, pkt_len); |
|
651 break; |
|
652 case ETH_P_IP: |
|
653 m = m_get(); |
|
654 if (!m) |
|
655 return; |
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656 /* Note: we add to align the IP header */ |
|
657 if (M_FREEROOM(m) < pkt_len + 2) { |
|
658 m_inc(m, pkt_len + 2); |
|
659 } |
|
660 m->m_len = pkt_len + 2; |
|
661 memcpy(m->m_data + 2, pkt, pkt_len); |
|
662 |
|
663 m->m_data += 2 + ETH_HLEN; |
|
664 m->m_len -= 2 + ETH_HLEN; |
|
665 |
|
666 ip_input(m); |
|
667 break; |
|
668 default: |
|
669 break; |
|
670 } |
|
671 } |
|
672 |
|
673 /* output the IP packet to the ethernet device */ |
|
674 void if_encap(const uint8_t *ip_data, int ip_data_len) |
|
675 { |
|
676 uint8_t buf[1600]; |
|
677 struct ethhdr *eh = (struct ethhdr *)buf; |
|
678 |
|
679 if (ip_data_len + ETH_HLEN > sizeof(buf)) |
|
680 return; |
|
681 |
|
682 if (!memcmp(client_ethaddr, zero_ethaddr, ETH_ALEN)) { |
|
683 uint8_t arp_req[ETH_HLEN + sizeof(struct arphdr)]; |
|
684 struct ethhdr *reh = (struct ethhdr *)arp_req; |
|
685 struct arphdr *rah = (struct arphdr *)(arp_req + ETH_HLEN); |
|
686 const struct ip *iph = (const struct ip *)ip_data; |
|
687 |
|
688 /* If the client addr is not known, there is no point in |
|
689 sending the packet to it. Normally the sender should have |
|
690 done an ARP request to get its MAC address. Here we do it |
|
691 in place of sending the packet and we hope that the sender |
|
692 will retry sending its packet. */ |
|
693 memset(reh->h_dest, 0xff, ETH_ALEN); |
|
694 memcpy(reh->h_source, special_ethaddr, ETH_ALEN - 1); |
|
695 reh->h_source[5] = CTL_ALIAS; |
|
696 reh->h_proto = htons(ETH_P_ARP); |
|
697 rah->ar_hrd = htons(1); |
|
698 rah->ar_pro = htons(ETH_P_IP); |
|
699 rah->ar_hln = ETH_ALEN; |
|
700 rah->ar_pln = 4; |
|
701 rah->ar_op = htons(ARPOP_REQUEST); |
|
702 /* source hw addr */ |
|
703 memcpy(rah->ar_sha, special_ethaddr, ETH_ALEN - 1); |
|
704 rah->ar_sha[5] = CTL_ALIAS; |
|
705 /* source IP */ |
|
706 memcpy(rah->ar_sip, &alias_addr, 4); |
|
707 /* target hw addr (none) */ |
|
708 memset(rah->ar_tha, 0, ETH_ALEN); |
|
709 /* target IP */ |
|
710 memcpy(rah->ar_tip, &iph->ip_dst, 4); |
|
711 client_ipaddr = iph->ip_dst; |
|
712 slirp_output(arp_req, sizeof(arp_req)); |
|
713 } else { |
|
714 memcpy(eh->h_dest, client_ethaddr, ETH_ALEN); |
|
715 memcpy(eh->h_source, special_ethaddr, ETH_ALEN - 1); |
|
716 /* XXX: not correct */ |
|
717 eh->h_source[5] = CTL_ALIAS; |
|
718 eh->h_proto = htons(ETH_P_IP); |
|
719 memcpy(buf + sizeof(struct ethhdr), ip_data, ip_data_len); |
|
720 slirp_output(buf, ip_data_len + ETH_HLEN); |
|
721 } |
|
722 } |
|
723 |
|
724 int slirp_redir(int is_udp, int host_port, |
|
725 struct in_addr guest_addr, int guest_port) |
|
726 { |
|
727 if (is_udp) { |
|
728 if (!udp_listen(htons(host_port), guest_addr.s_addr, |
|
729 htons(guest_port), 0)) |
|
730 return -1; |
|
731 } else { |
|
732 if (!solisten(htons(host_port), guest_addr.s_addr, |
|
733 htons(guest_port), 0)) |
|
734 return -1; |
|
735 } |
|
736 return 0; |
|
737 } |
|
738 |
|
739 int slirp_add_exec(int do_pty, const char *args, int addr_low_byte, |
|
740 int guest_port) |
|
741 { |
|
742 return add_exec(&exec_list, do_pty, (char *)args, |
|
743 addr_low_byte, htons(guest_port)); |
|
744 } |