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annotate sysoptions.h @ 499:f3ca5ebc319a

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Split options.h out into sysoptions.h for options that aren't usually user-changed
author Matt Johnston <matt@ucc.asn.au>
date Tue, 23 Sep 2008 16:02:51 +0000
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children d58c478bd399
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499
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually
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1 /*******************************************************************
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2 * You shouldn't edit this file unless you know you need to.
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3 * This file is only included from options.h
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4 *******************************************************************/
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5
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6 #ifndef DROPBEAR_VERSION
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7 #define DROPBEAR_VERSION "0.51"
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8 #endif
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9
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10 #define LOCAL_IDENT "SSH-2.0-dropbear_" DROPBEAR_VERSION
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11 #define PROGNAME "dropbear"
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12
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13 /* Spec recommends after one hour or 1 gigabyte of data. One hour
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14 * is a bit too verbose, so we try 8 hours */
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15 #ifndef KEX_REKEY_TIMEOUT
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16 #define KEX_REKEY_TIMEOUT (3600 * 8)
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17 #endif
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18 #ifndef KEX_REKEY_DATA
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19 #define KEX_REKEY_DATA (1<<30) /* 2^30 == 1GB, this value must be < INT_MAX */
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20 #endif
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21 /* Close connections to clients which haven't authorised after AUTH_TIMEOUT */
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22 #ifndef AUTH_TIMEOUT
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23 #define AUTH_TIMEOUT 300 /* we choose 5 minutes */
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24 #endif
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25
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26 /* Minimum key sizes for DSS and RSA */
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27 #ifndef MIN_DSS_KEYLEN
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28 #define MIN_DSS_KEYLEN 512
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29 #endif
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30 #ifndef MIN_RSA_KEYLEN
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31 #define MIN_RSA_KEYLEN 512
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32 #endif
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33
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34 #define MAX_BANNER_SIZE 2000 /* this is 25*80 chars, any more is foolish */
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35 #define MAX_BANNER_LINES 20 /* How many lines the client will display */
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36
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37 /* the number of NAME=VALUE pairs to malloc for environ, if we don't have
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38 * the clearenv() function */
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39 #define ENV_SIZE 100
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40
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41 #define MAX_CMD_LEN 1024 /* max length of a command */
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42 #define MAX_TERM_LEN 200 /* max length of TERM name */
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43
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44 #define MAX_HOST_LEN 254 /* max hostname len for tcp fwding */
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45 #define MAX_IP_LEN 15 /* strlen("255.255.255.255") == 15 */
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46
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47 #define DROPBEAR_MAX_PORTS 10 /* max number of ports which can be specified,
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48 ipv4 and ipv6 don't count twice */
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49
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50 /* Each port might have at least a v4 and a v6 address */
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51 #define MAX_LISTEN_ADDR (DROPBEAR_MAX_PORTS*3)
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52
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53 #define _PATH_TTY "/dev/tty"
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54
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55 #define _PATH_CP "/bin/cp"
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56
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57 /* success/failure defines */
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58 #define DROPBEAR_SUCCESS 0
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59 #define DROPBEAR_FAILURE -1
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60
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61 /* various algorithm identifiers */
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62 #define DROPBEAR_KEX_DH_GROUP1 0
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63
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64 #define DROPBEAR_SIGNKEY_ANY 0
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65 #define DROPBEAR_SIGNKEY_RSA 1
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66 #define DROPBEAR_SIGNKEY_DSS 2
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67 #define DROPBEAR_SIGNKEY_NONE 3
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68
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69 #define DROPBEAR_COMP_NONE 0
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70 #define DROPBEAR_COMP_ZLIB 1
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71
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72 /* Required for pubkey auth */
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73 #if defined(ENABLE_SVR_PUBKEY_AUTH) || defined(DROPBEAR_CLIENT)
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74 #define DROPBEAR_SIGNKEY_VERIFY
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75 #endif
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76
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77 /* SHA1 is 20 bytes == 160 bits */
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78 #define SHA1_HASH_SIZE 20
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79 /* SHA512 is 64 bytes == 512 bits */
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80 #define SHA512_HASH_SIZE 64
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81 /* MD5 is 16 bytes = 128 bits */
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82 #define MD5_HASH_SIZE 16
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83
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84 /* largest of MD5 and SHA1 */
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85 #define MAX_MAC_LEN SHA1_HASH_SIZE
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86
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87
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88 #define MAX_KEY_LEN 32 /* 256 bits for aes256 etc */
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89 #define MAX_IV_LEN 20 /* must be same as max blocksize,
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90 and >= SHA1_HASH_SIZE */
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91 #define MAX_MAC_KEY 20
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92
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93 #define MAX_NAME_LEN 64 /* maximum length of a protocol name, isn't
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94 explicitly specified for all protocols (just
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95 for algos) but seems valid */
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96
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97 #define MAX_PROPOSED_ALGO 20
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98
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99 /* size/count limits */
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100 #define MIN_PACKET_LEN 16
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101
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102 #define RECV_MAX_PACKET_LEN (MAX(35000, ((RECV_MAX_PAYLOAD_LEN)+100)))
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103
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104 /* for channel code */
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105 #define TRANS_MAX_WINDOW 500000000 /* 500MB is sufficient, stopping overflow */
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106 #define TRANS_MAX_WIN_INCR 500000000 /* overflow prevention */
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107
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108 #define RECV_WINDOWEXTEND (opts.recv_window / 3) /* We send a "window extend" every
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109 RECV_WINDOWEXTEND bytes */
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110 #define MAX_RECV_WINDOW (1024*1024) /* 1 MB should be enough */
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111
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112 #define MAX_CHANNELS 100 /* simple mem restriction, includes each tcp/x11
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113 connection, so can't be _too_ small */
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114
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115 #define MAX_STRING_LEN 1400 /* ~= MAX_PROPOSED_ALGO * MAX_NAME_LEN, also
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116 is the max length for a password etc */
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117
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118 /* For a 4096 bit DSS key, empirically determined */
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119 #define MAX_PUBKEY_SIZE 1700
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120 /* For a 4096 bit DSS key, empirically determined */
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121 #define MAX_PRIVKEY_SIZE 1700
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122
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123 /* The maximum size of the bignum portion of the kexhash buffer */
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124 /* Sect. 8 of the transport draft, K_S + e + f + K */
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125 #define KEXHASHBUF_MAX_INTS (1700 + 130 + 130 + 130)
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126
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127 #define DROPBEAR_MAX_SOCKS 2 /* IPv4, IPv6 are all we'll get for now. Revisit
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128 in a few years time.... */
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129
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130 #define DROPBEAR_MAX_CLI_PASS 1024
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131
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132 #define DROPBEAR_MAX_CLI_INTERACT_PROMPTS 80 /* The number of prompts we'll
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133 accept for keyb-interactive
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134 auth */
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135
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136 #if defined(DROPBEAR_AES256_CBC) || defined(DROPBEAR_AES128_CBC)
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137 #define DROPBEAR_AES_CBC
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138 #endif
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139
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140 #if defined(DROPBEAR_TWOFISH256_CBC) || defined(DROPBEAR_TWOFISH128_CBC)
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141 #define DROPBEAR_TWOFISH_CBC
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142 #endif
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143
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144 #ifndef ENABLE_X11FWD
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145 #define DISABLE_X11FWD
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146 #endif
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147
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148 #ifndef ENABLE_AGENTFWD
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149 #define DISABLE_AGENTFWD
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150 #endif
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151
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152 #if defined(ENABLE_CLI_REMOTETCPFWD) || defined(ENABLE_CLI_LOCALTCPFWD)
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153 #define ENABLE_CLI_ANYTCPFWD
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154 #endif
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155
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156 #if defined(ENABLE_CLI_LOCALTCPFWD) || defined(ENABLE_SVR_REMOTETCPFWD)
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157 #define DROPBEAR_TCP_ACCEPT
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158 #endif
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159
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160 #if defined(ENABLE_CLI_REMOTETCPFWD) || defined(ENABLE_CLI_LOCALTCPFWD) || \
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161 defined(ENABLE_SVR_REMOTETCPFWD) || defined(ENABLE_SVR_LOCALTCPFWD) || \
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162 defined(ENABLE_AGENTFWD) || defined(ENABLE_X11FWD)
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163 #define USING_LISTENERS
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164 #endif
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165
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166 #if defined(ENABLE_CLI_NETCAT) && defined(ENABLE_CLI_PROXYCMD)
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167 #define ENABLE_CLI_MULTIHOP
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168 #endif
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169
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170 #if defined(DROPBEAR_CLIENT) || defined(ENABLE_SVR_PUBKEY_AUTH)
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171 #define DROPBEAR_KEY_LINES /* ie we're using authorized_keys or known_hosts */
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172 #endif
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173
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174 #if defined(ENABLE_SVR_PASSWORD_AUTH) && defined(ENABLE_SVR_PAM_AUTH)
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175 #error "You can't turn on PASSWORD and PAM auth both at once. Fix it in options.h"
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176 #endif
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177
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178 #if defined(DROPBEAR_RANDOM_DEV) && defined(DROPBEAR_PRNGD_SOCKET)
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179 #error "You can't turn on DROPBEAR_PRNGD_SOCKET and DROPBEAR_RANDOM_DEV at once"
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180 #endif
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181
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182 #if !defined(DROPBEAR_RANDOM_DEV) && !defined(DROPBEAR_PRNGD_SOCKET)
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183 #error "You must choose one of DROPBEAR_PRNGD_SOCKET or DROPBEAR_RANDOM_DEV in options.h"
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184 #endif
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185
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186 /* We use dropbear_client and dropbear_server as shortcuts to avoid redundant
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187 * code, if we're just compiling as client or server */
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188 #if defined(DROPBEAR_SERVER) && defined(DROPBEAR_CLIENT)
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189
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190 #define IS_DROPBEAR_SERVER (ses.isserver == 1)
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191 #define IS_DROPBEAR_CLIENT (ses.isserver == 0)
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192
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193 #elif defined(DROPBEAR_SERVER)
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194
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195 #define IS_DROPBEAR_SERVER 1
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196 #define IS_DROPBEAR_CLIENT 0
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197
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198 #elif defined(DROPBEAR_CLIENT)
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199
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200 #define IS_DROPBEAR_SERVER 0
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201 #define IS_DROPBEAR_CLIENT 1
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202
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203 #else
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204 #error You must compiled with either DROPBEAR_CLIENT or DROPBEAR_SERVER selected
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205 #endif