1 | /* $Id: mr_connect.c,v 1.37 2006-09-07 18:21:48 zacheiss Exp $ |
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2 | * |
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3 | * This routine is part of the client library. It handles |
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4 | * creating a connection to the moira server. |
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5 | * |
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6 | * Copyright (C) 1987-1998 by the Massachusetts Institute of Technology |
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7 | * For copying and distribution information, please see the file |
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8 | * <mit-copyright.h>. |
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9 | */ |
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10 | |
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11 | #include <mit-copyright.h> |
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12 | #include <moira.h> |
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13 | #include <moira_site.h> |
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14 | #include "mr_private.h" |
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15 | |
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16 | #include <sys/types.h> |
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17 | |
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18 | #include <errno.h> |
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19 | #include <stdlib.h> |
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20 | #include <string.h> |
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21 | |
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22 | #ifdef HAVE_UNISTD_H |
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23 | #include <unistd.h> |
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24 | #endif |
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25 | |
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26 | #ifndef _WIN32 |
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27 | #include <sys/socket.h> |
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28 | #include <netinet/in.h> |
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29 | #include <netdb.h> |
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30 | #ifndef closesocket |
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31 | #define closesocket close |
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32 | #endif |
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33 | #ifndef SOCKET_ERROR |
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34 | #define SOCKET_ERROR -1 |
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35 | #endif |
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36 | #endif |
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37 | |
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38 | #ifdef HAVE_HESIOD |
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39 | #include <hesiod.h> |
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40 | #ifdef _WIN32 |
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41 | /* This is declared in wshelper's resolv.h, but the definition of |
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42 | * the putlong macro conflicts with Moira's |
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43 | */ |
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44 | struct hostent * WINAPI rgethostbyname(char *name); |
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45 | #endif |
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46 | #endif |
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47 | |
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48 | RCSID("$Header: /afs/athena.mit.edu/astaff/project/moiradev/repository/moira/lib/mr_connect.c,v 1.37 2006-09-07 18:21:48 zacheiss Exp $"); |
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49 | |
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50 | #define DEFAULT_SERV "moira_db" |
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51 | #define DEFAULT_PORT 775 |
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52 | |
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53 | int _mr_conn = 0; |
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54 | static char *mr_server_host = NULL; |
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55 | |
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56 | /* mrgdb compatibility magic |
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57 | |
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58 | The data looks like this: |
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59 | |
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60 | client -> server |
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61 | 00000036 [length of rest of packet] |
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62 | 00000004 [number of fields] |
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63 | 01 01 01 01 [types of fields: 4 strings] |
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64 | "server_id\0parms\0host\0user\0" [field names] |
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65 | 00000001 [length of null-terminated server_id] |
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66 | "\0" [server_id: ignored anyway] |
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67 | 00000001 [length of null-terminated parms] |
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68 | "\0" [parms: ignored anyway] |
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69 | 00000001 [length of null-terminated client host] |
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70 | "\0" [host: ignored anyway] |
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71 | 00000001 [length of null-terminated client name] |
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72 | "\0" [user: ignored anyway] |
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73 | |
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74 | server -> client |
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75 | 00000031 [length of rest of packet] |
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76 | 00000003 [number of fields] |
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77 | 00 01 01 [types of fields: int and 2 strings] |
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78 | "disposition\0server_id\0parms\0" [field names] |
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79 | 00000001 [GDB_ACCEPTED] |
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80 | 00000001 [length of null-terminated server_id] |
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81 | "\0" [server_id: ignored anyway] |
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82 | 00000001 [length of null-terminated parms] |
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83 | "\0" [parms: ignored anyway] |
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84 | |
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85 | */ |
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86 | |
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87 | static char challenge[58] = "\0\0\0\066\0\0\0\004\001\001\001\001server_id\0parms\0host\0user\0\0\0\0\001\0\0\0\0\001\0\0\0\0\001\0\0\0\0\001\0"; |
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88 | static char response[53] = "\0\0\0\061\0\0\0\003\0\001\001disposition\0server_id\0parms\0\0\0\0\001\0\0\0\001\0\0\0\0\001\0"; |
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89 | |
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90 | /* |
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91 | * Open a connection to the moira server. Looks for the server name |
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92 | * 1) passed as an argument, 2) in environment variable, 3) by hesiod |
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93 | * 4) compiled in default |
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94 | */ |
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95 | |
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96 | int mr_connect(char *server) |
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97 | { |
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98 | char *port, **pp, *sbuf = NULL; |
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99 | |
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100 | if (_mr_conn) |
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101 | return MR_ALREADY_CONNECTED; |
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102 | if (!mr_inited) |
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103 | mr_init(); |
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104 | |
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105 | if (!server || (strlen(server) == 0)) |
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106 | server = getenv("MOIRASERVER"); |
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107 | |
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108 | #ifdef HAVE_HESIOD |
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109 | if (!server || (strlen(server) == 0)) |
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110 | { |
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111 | pp = hes_resolve("moira", "sloc"); |
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112 | if (pp) |
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113 | server = *pp; |
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114 | } |
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115 | #endif |
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116 | |
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117 | if (!server || (strlen(server) == 0)) |
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118 | server = MOIRA_SERVER; |
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119 | |
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120 | if (strchr(server, ':')) |
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121 | { |
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122 | int len = strcspn(server, ":"); |
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123 | sbuf = malloc(len + 1); |
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124 | strncpy(sbuf, server, len); |
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125 | sbuf[len] = '\0'; |
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126 | port = strchr(server, ':') + 1; |
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127 | server = sbuf; |
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128 | } |
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129 | else |
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130 | port = strchr(MOIRA_SERVER, ':') + 1; |
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131 | |
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132 | _mr_conn = mr_connect_internal(server, port); |
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133 | free(sbuf); |
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134 | if (!_mr_conn) |
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135 | return MR_CANT_CONNECT; |
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136 | |
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137 | return MR_SUCCESS; |
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138 | } |
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139 | |
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140 | int mr_connect_internal(char *server, char *port) |
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141 | { |
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142 | int size, more; |
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143 | struct sockaddr_in target; |
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144 | struct hostent *shost; |
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145 | char actualresponse[53]; |
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146 | char *host = NULL; |
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147 | int fd = SOCKET_ERROR; |
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148 | int ok = 0; |
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149 | int on = 1; /* Value variable for setsockopt() */ |
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150 | |
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151 | #if defined(_WIN32) && defined(HAVE_HESIOD) |
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152 | shost = rgethostbyname(server); |
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153 | #else |
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154 | shost = gethostbyname(server); |
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155 | #endif |
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156 | if (!shost) |
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157 | goto cleanup; |
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158 | |
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159 | /* Get the host info in case some library decides to clobber shost. */ |
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160 | memcpy(&target.sin_addr, shost->h_addr, shost->h_length); |
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161 | target.sin_family = shost->h_addrtype; |
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162 | host = strdup(shost->h_name); |
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163 | |
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164 | if (port[0] == '#') |
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165 | target.sin_port = htons((unsigned short)atoi(port + 1)); |
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166 | else |
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167 | { |
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168 | struct servent *s; |
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169 | target.sin_port = 0; |
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170 | s = getservbyname(port, "tcp"); |
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171 | if (s) |
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172 | target.sin_port = s->s_port; |
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173 | #ifdef HAVE_HESIOD |
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174 | if (!target.sin_port) |
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175 | { |
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176 | s = hes_getservbyname(port, "tcp"); |
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177 | if (s) |
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178 | target.sin_port = s->s_port; |
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179 | } |
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180 | #endif |
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181 | if (!target.sin_port && !strcasecmp(port, DEFAULT_SERV)) |
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182 | target.sin_port = htons(DEFAULT_PORT); |
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183 | if (!target.sin_port) |
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184 | goto cleanup; |
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185 | } |
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186 | |
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187 | fd = socket(AF_INET, SOCK_STREAM, 0); |
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188 | if (fd < 0) |
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189 | goto cleanup; |
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190 | |
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191 | if (setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, (char *)&on, sizeof(int)) < 0) |
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192 | goto cleanup; |
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193 | |
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194 | if (connect(fd, (struct sockaddr *)&target, sizeof(target)) < 0) |
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195 | goto cleanup; |
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196 | |
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197 | /* Do magic mrgdb initialization */ |
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198 | size = send(fd, challenge, sizeof(challenge), 0); |
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199 | if (size != sizeof(challenge)) |
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200 | goto cleanup; |
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201 | for (size = 0; size < sizeof(actualresponse); size += more) |
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202 | { |
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203 | more = recv(fd, actualresponse + size, sizeof(actualresponse) - size, 0); |
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204 | if (more <= 0) |
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205 | break; |
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206 | } |
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207 | if (size != sizeof(actualresponse)) |
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208 | goto cleanup; |
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209 | if (memcmp(actualresponse, response, sizeof(actualresponse))) |
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210 | goto cleanup; |
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211 | |
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212 | ok = 1; |
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213 | mr_server_host = host; |
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214 | |
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215 | cleanup: |
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216 | if (!ok) |
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217 | { |
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218 | if (host) |
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219 | free(host); |
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220 | if (fd != SOCKET_ERROR) |
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221 | closesocket(fd); |
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222 | return 0; |
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223 | } |
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224 | /* You win */ |
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225 | return fd; |
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226 | } |
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227 | |
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228 | int mr_disconnect(void) |
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229 | { |
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230 | CHECK_CONNECTED; |
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231 | closesocket(_mr_conn); |
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232 | _mr_conn = 0; |
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233 | free(mr_server_host); |
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234 | mr_server_host = NULL; |
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235 | return MR_SUCCESS; |
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236 | } |
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237 | |
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238 | int mr_host(char *host, int size) |
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239 | { |
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240 | CHECK_CONNECTED; |
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241 | |
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242 | /* If we are connected, mr_server_host points to a valid string. */ |
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243 | strncpy(host, mr_server_host, size); |
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244 | host[size - 1] = '\0'; |
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245 | return MR_SUCCESS; |
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246 | } |
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247 | |
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248 | int mr_noop(void) |
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249 | { |
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250 | int status; |
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251 | mr_params params, reply; |
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252 | |
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253 | CHECK_CONNECTED; |
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254 | params.u.mr_procno = MR_NOOP; |
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255 | params.mr_argc = 0; |
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256 | params.mr_argl = NULL; |
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257 | params.mr_argv = NULL; |
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258 | |
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259 | if ((status = mr_do_call(¶ms, &reply)) == MR_SUCCESS) |
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260 | status = reply.u.mr_status; |
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261 | |
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262 | mr_destroy_reply(reply); |
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263 | |
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264 | return status; |
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265 | } |
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266 | |
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267 | |
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268 | /* Server side */ |
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269 | |
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270 | int mr_listen(char *port) |
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271 | { |
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272 | struct sockaddr_in sin; |
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273 | int s, on = 1; |
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274 | |
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275 | memset(&sin, 0, sizeof(sin)); |
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276 | sin.sin_family = AF_INET; |
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277 | if (port[0] == '#') |
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278 | sin.sin_port = atoi(port + 1); |
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279 | else |
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280 | { |
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281 | struct servent *s; |
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282 | s = getservbyname(port, "tcp"); |
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283 | if (s) |
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284 | sin.sin_port = s->s_port; |
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285 | else |
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286 | #ifndef HAVE_HESIOD |
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287 | return -1; |
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288 | #else |
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289 | { |
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290 | s = hes_getservbyname(port, "tcp"); |
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291 | if (s) |
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292 | sin.sin_port = s->s_port; |
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293 | else |
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294 | return -1; |
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295 | } |
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296 | #endif /* HAVE_HESIOD */ |
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297 | } |
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298 | |
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299 | s = socket(AF_INET, SOCK_STREAM, 0); |
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300 | if (s < 0) |
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301 | return -1; |
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302 | if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (char *)&on, sizeof(int)) < 0) |
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303 | { |
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304 | closesocket(s); |
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305 | return -1; |
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306 | } |
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307 | if (bind(s, (struct sockaddr *)&sin, sizeof(sin)) < 0) |
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308 | { |
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309 | closesocket(s); |
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310 | return -1; |
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311 | } |
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312 | if (listen(s, 5) < 0) |
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313 | { |
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314 | closesocket(s); |
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315 | return -1; |
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316 | } |
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317 | |
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318 | return s; |
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319 | } |
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320 | |
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321 | /* mr_accept returns -1 on accept() error, 0 on bad connection, |
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322 | or connection fd on success */ |
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323 | |
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324 | int mr_accept(int s, struct sockaddr_in *sin) |
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325 | { |
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326 | int conn = -1, addrlen = sizeof(struct sockaddr_in), nread, status; |
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327 | char *buf = NULL; |
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328 | |
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329 | while (conn < 0) |
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330 | { |
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331 | conn = accept(s, (struct sockaddr *)sin, &addrlen); |
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332 | if (conn < 0 && errno != EINTR |
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333 | #ifdef ERESTART |
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334 | && errno != ERESTART |
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335 | #endif |
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336 | #ifdef ECONNABORTED |
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337 | && errno != ECONNABORTED |
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338 | #endif |
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339 | ) |
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340 | return -1; |
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341 | } |
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342 | |
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343 | do |
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344 | status = mr_cont_accept(conn, &buf, &nread); |
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345 | while (status == -1); |
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346 | |
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347 | return status; |
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348 | } |
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349 | |
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350 | /* mr_cont_accept returns 0 if it has failed, an fd if it has succeeded, |
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351 | or -1 if it is still making progress */ |
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352 | |
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353 | int mr_cont_accept(int conn, char **buf, int *nread) |
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354 | { |
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355 | long len, more; |
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356 | |
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357 | if (!*buf) |
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358 | { |
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359 | char lbuf[4]; |
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360 | if (recv(conn, lbuf, 4, 0) != 4) |
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361 | { |
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362 | closesocket(conn); |
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363 | return 0; |
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364 | } |
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365 | getlong(lbuf, len); |
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366 | len += 4; |
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367 | |
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368 | if (len < 58 || len > 1000) |
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369 | { |
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370 | closesocket(conn); |
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371 | return 0; |
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372 | } |
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373 | |
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374 | *buf = malloc(len); |
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375 | if (!*buf) |
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376 | { |
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377 | closesocket(conn); |
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378 | return 0; |
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379 | } |
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380 | putlong(*buf, len); |
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381 | *nread = 4; |
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382 | return -1; |
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383 | } |
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384 | else |
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385 | getlong(*buf, len); |
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386 | |
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387 | more = recv(conn, *buf + *nread, len - *nread, 0); |
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388 | |
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389 | switch (more) |
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390 | { |
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391 | case 0: |
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392 | /* If we read 0 bytes, the remote end has gone away. */ |
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393 | break; |
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394 | case -1: |
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395 | /* If errno is EINTR, return -1 and try again, otherwise we failed. */ |
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396 | if (errno == EINTR) |
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397 | return -1; |
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398 | else |
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399 | { |
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400 | closesocket(conn); |
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401 | free(*buf); |
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402 | return 0; |
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403 | } |
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404 | break; |
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405 | default: |
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406 | *nread += more; |
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407 | if (*nread != len) |
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408 | return -1; |
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409 | break; |
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410 | } |
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411 | |
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412 | if (memcmp(*buf + 4, challenge + 4, 34)) |
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413 | { |
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414 | closesocket(conn); |
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415 | free(*buf); |
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416 | return 0; |
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417 | } |
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418 | |
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419 | /* good enough */ |
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420 | free(*buf); |
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421 | |
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422 | if (send(conn, response, sizeof(response), 0) != sizeof(response)) |
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423 | { |
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424 | closesocket(conn); |
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425 | return 0; |
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426 | } |
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427 | return conn; |
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428 | } |
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