1 | //FIXME Not checked on threadsafety yet; after checking please remove this line
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2 | #include "globals.h"
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3 |
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4 | #ifdef CS_ANTICASC
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5 |
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6 | #include "module-anticasc.h"
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7 | #include "oscam-conf.h"
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8 | #include "oscam-garbage.h"
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9 | #include "oscam-string.h"
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10 | #include "oscam-time.h"
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11 |
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12 | #define cs_ac "oscam.ac"
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13 |
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14 | FILE *ac_log = NULL;
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15 |
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16 | //static time_t ac_last_chk;
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17 | static uchar ac_ecmd5[CS_ECMSTORESIZE];
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18 |
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19 | static int32_t ac_init_log(void)
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20 | {
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21 | if(ac_log)
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22 | { return 1; }
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23 | if(!cfg.ac_logfile)
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24 | {
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25 | cs_log("ERROR: anti cascading is enabled but ac_logfile is not set.");
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26 | return 0;
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27 | }
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28 | ac_log = fopen(cfg.ac_logfile, "a+");
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29 | if(!ac_log)
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30 | {
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31 | cs_log("ERROR: Can't open anti cascading logfile: %s (errno=%d %s)",
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32 | cfg.ac_logfile, errno, strerror(errno));
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33 | return 0;
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34 | }
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35 | cs_log("anti cascading log initialized");
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36 | return 1;
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37 | }
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38 |
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39 |
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40 | void ac_clear(void)
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41 | {
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42 | struct s_client *client;
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43 | struct s_auth *account;
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44 |
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45 | for(client = first_client; client; client = client->next)
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46 | {
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47 | if(client->typ != 'c') { continue; }
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48 | memset(&client->acasc, 0, sizeof(client->acasc));
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49 | }
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50 |
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51 | for(account = cfg.account; account; account = account->next)
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52 | { memset(&account->ac_stat, 0, sizeof(account->ac_stat)); }
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53 | }
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54 |
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55 | void ac_init_stat(void)
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56 | {
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57 | if(!cfg.ac_enabled)
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58 | { return; }
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59 | ac_clear();
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60 | ac_init_log();
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61 | }
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62 |
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63 | void ac_do_stat(void)
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64 | {
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65 | int32_t j, idx, exceeds, maxval, prev_deny = 0;
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66 |
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67 | struct s_client *client;
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68 | for(client = first_client; client; client = client->next)
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69 | {
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70 | if(client->typ != 'c') { continue; }
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71 |
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72 | struct s_acasc *ac_stat = &client->account->ac_stat;
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73 | struct s_acasc_shm *acasc = &client->acasc;
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74 |
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75 | idx = ac_stat->idx;
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76 | ac_stat->stat[idx] = acasc->ac_count;
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77 | acasc->ac_count = 0;
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78 |
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79 | if(ac_stat->stat[idx])
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80 | {
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81 | if(client->ac_penalty == 2) // banned
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82 | {
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83 | cs_debug_mask(D_CLIENT, "acasc: user '%s' banned", client->account->usr);
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84 | acasc->ac_deny = 1;
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85 | }
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86 | else
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87 | {
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88 | for(j = exceeds = maxval = 0; j < cfg.ac_samples; j++)
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89 | {
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90 | if(ac_stat->stat[j] > maxval)
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91 | { maxval = ac_stat->stat[j]; }
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92 | exceeds += (ac_stat->stat[j] > client->ac_limit);
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93 | }
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94 | prev_deny = acasc->ac_deny;
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95 | acasc->ac_deny = (exceeds >= cfg.ac_denysamples);
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96 |
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97 | cs_debug_mask(D_CLIENT, "acasc: %s limit=%d, max=%d, samples=%d, dsamples=%d, [idx=%d]:",
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98 | client->account->usr, client->ac_limit, maxval,
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99 | cfg.ac_samples, cfg.ac_denysamples, idx);
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100 | cs_debug_mask(D_CLIENT, "acasc: %d %d %d %d %d %d %d %d %d %d ", ac_stat->stat[0],
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101 | ac_stat->stat[1], ac_stat->stat[2], ac_stat->stat[3],
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102 | ac_stat->stat[4], ac_stat->stat[5], ac_stat->stat[6],
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103 | ac_stat->stat[7], ac_stat->stat[8], ac_stat->stat[9]);
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104 | if(acasc->ac_deny)
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105 | {
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106 | cs_log("acasc: user '%s' exceeds limit", client->account->usr);
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107 | ac_stat->stat[idx] = 0;
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108 | }
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109 | else if(prev_deny)
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110 | { cs_log("acasc: user '%s' restored access", client->account->usr); }
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111 | }
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112 | }
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113 | else if(acasc->ac_deny)
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114 | {
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115 | prev_deny = 1;
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116 | acasc->ac_deny = 0;
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117 | cs_log("acasc: restored access for inactive user '%s'", client->account->usr);
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118 | }
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119 |
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120 | if(!acasc->ac_deny && !prev_deny)
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121 | { ac_stat->idx = (ac_stat->idx + 1) % cfg.ac_samples; }
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122 | }
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123 | }
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124 |
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125 | void ac_init_client(struct s_client *client, struct s_auth *account)
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126 | {
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127 | client->ac_limit = 0;
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128 | client->ac_penalty = account->ac_penalty == -1 ? cfg.ac_penalty : account->ac_penalty;
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129 | client->ac_fakedelay = account->ac_fakedelay == -1 ? cfg.ac_fakedelay : account->ac_fakedelay;
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130 | if(cfg.ac_enabled)
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131 | {
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132 | int32_t numusers = account->ac_users;
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133 | if(numusers == -1)
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134 | { numusers = cfg.ac_users; }
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135 |
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136 | if(numusers)
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137 | {
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138 | client->ac_limit = (numusers * 100 + 80) * cfg.ac_stime;
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139 | cs_debug_mask(D_CLIENT, "acasc: user '%s', users=%d, stime=%d min, dwlimit=%d per min, penalty=%d",
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140 | account->usr, numusers, cfg.ac_stime,
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141 | numusers * 100 + 80, client->ac_penalty);
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142 | }
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143 | else
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144 | {
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145 | cs_debug_mask(D_CLIENT, "acasc: anti-cascading not used for user '%s'", account->usr);
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146 | }
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147 | }
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148 | }
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149 |
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150 | static int32_t ac_dw_weight(ECM_REQUEST *er)
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151 | {
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152 | struct s_cpmap *cpmap;
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153 |
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154 | for(cpmap = cfg.cpmap; (cpmap) ; cpmap = cpmap->next)
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155 | if((cpmap->caid == 0 || cpmap->caid == er->caid) &&
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156 | (cpmap->provid == 0 || cpmap->provid == er->prid) &&
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157 | (cpmap->sid == 0 || cpmap->sid == er->srvid) &&
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158 | (cpmap->chid == 0 || cpmap->chid == er->chid))
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159 | { return (cpmap->dwtime * 100 / 60); }
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160 |
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161 | cs_debug_mask(D_CLIENT, "acasc: WARNING: CAID %04X, PROVID %06X, SID %04X, CHID %04X not found in oscam.ac",
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162 | er->caid, er->prid, er->srvid, er->chid);
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163 | cs_debug_mask(D_CLIENT, "acasc: set DW lifetime 10 sec");
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164 | return 16; // 10*100/60
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165 | }
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166 |
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167 | void ac_chk(struct s_client *cl, ECM_REQUEST *er, int32_t level)
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168 | {
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169 | if(!cl->ac_limit || !cfg.ac_enabled) { return; }
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170 |
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171 | struct s_acasc_shm *acasc = &cl->acasc;
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172 |
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173 | if(level == 1)
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174 | {
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175 | if(er->rc == E_FAKE)
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176 | { acasc->ac_count++; }
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177 |
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178 | if(er->rc >= E_NOTFOUND)
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179 | { return; } // not found
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180 |
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181 | if(memcmp(ac_ecmd5, er->ecmd5, CS_ECMSTORESIZE) != 0)
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182 | {
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183 | acasc->ac_count += ac_dw_weight(er);
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184 | memcpy(ac_ecmd5, er->ecmd5, CS_ECMSTORESIZE);
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185 | }
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186 | return;
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187 | }
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188 |
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189 | if(acasc->ac_deny)
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190 | {
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191 | if(cl->ac_penalty)
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192 | {
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193 | if(cl->ac_penalty == 3)
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194 | {
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195 | if(cl->ac_fakedelay > 0)
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196 | { cs_debug_mask(D_CLIENT, "acasc: fake delay %dms", cl->ac_fakedelay); }
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197 | }
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198 | else
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199 | {
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200 | cs_debug_mask(D_CLIENT, "acasc: send fake dw");
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201 | er->rc = E_FAKE; // fake
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202 | er->rcEx = 0;
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203 | }
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204 | if(cl->ac_fakedelay > 0)
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205 | { cs_sleepms(cl->ac_fakedelay); }
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206 | }
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207 | }
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208 | }
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209 |
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210 | static void ac_load_config(void)
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211 | {
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212 | FILE *fp = open_config_file(cs_ac);
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213 | if(!fp)
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214 | { return; }
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215 |
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216 | int32_t nr;
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217 | char *saveptr1 = NULL, *token;
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218 | if(!cs_malloc(&token, MAXLINESIZE))
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219 | { return; }
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220 | struct s_cpmap *cur_cpmap, *first_cpmap = NULL, *last_cpmap = NULL;
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221 |
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222 | for(nr = 0; fgets(token, MAXLINESIZE, fp);)
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223 | {
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224 | int32_t i, skip;
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225 | uint16_t caid, sid, chid, dwtime;
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226 | uint32_t provid;
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227 | char *ptr, *ptr1;
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228 |
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229 | if(strlen(token) < 4) { continue; }
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230 |
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231 | caid = sid = chid = dwtime = 0;
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232 | provid = 0;
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233 | skip = 0;
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234 | ptr1 = 0;
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235 | for(i = 0, ptr = strtok_r(token, "=", &saveptr1); (i < 2) && (ptr); ptr = strtok_r(NULL, "=", &saveptr1), i++)
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236 | {
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237 | trim(ptr);
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238 | if(*ptr == ';' || *ptr == '#' || *ptr == '-')
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239 | {
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240 | skip = 1;
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241 | break;
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242 | }
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243 | switch(i)
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244 | {
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245 | case 0:
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246 | ptr1 = ptr;
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247 | break;
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248 | case 1:
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249 | dwtime = atoi(ptr);
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250 | break;
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251 | }
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252 | }
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253 |
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254 | if(!skip)
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255 | {
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256 | for(i = 0, ptr = strtok_r(ptr1, ":", &saveptr1); (i < 4) && (ptr); ptr = strtok_r(NULL, ":", &saveptr1), i++)
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257 | {
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258 | trim(ptr);
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259 | switch(i)
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260 | {
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261 | case 0:
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262 | if(*ptr == '*') { caid = 0; }
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263 | else { caid = a2i(ptr, 4); }
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264 | break;
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265 | case 1:
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266 | if(*ptr == '*') { provid = 0; }
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267 | else { provid = a2i(ptr, 6); }
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268 | break;
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269 | case 2:
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270 | if(*ptr == '*') { sid = 0; }
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271 | else { sid = a2i(ptr, 4); }
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272 | break;
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273 | case 3:
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274 | if(*ptr == '*') { chid = 0; }
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275 | else { chid = a2i(ptr, 4); }
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276 | break;
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277 | }
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278 | }
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279 | if(!cs_malloc(&cur_cpmap, sizeof(struct s_cpmap)))
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280 | {
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281 | for(cur_cpmap = first_cpmap; cur_cpmap;)
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282 | {
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283 | last_cpmap = cur_cpmap;
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284 | cur_cpmap = cur_cpmap->next;
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285 | NULLFREE(last_cpmap);
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286 | }
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287 | NULLFREE(token);
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288 | return;
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289 | }
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290 | if(last_cpmap)
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291 | { last_cpmap->next = cur_cpmap; }
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292 | else
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293 | { first_cpmap = cur_cpmap; }
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294 | last_cpmap = cur_cpmap;
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295 |
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296 | cur_cpmap->caid = caid;
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297 | cur_cpmap->provid = provid;
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298 | cur_cpmap->sid = sid;
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299 | cur_cpmap->chid = chid;
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300 | cur_cpmap->dwtime = dwtime;
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301 | cur_cpmap->next = 0;
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302 |
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303 | cs_debug_mask(D_CLIENT, "nr=%d, caid=%04X, provid=%06X, sid=%04X, chid=%04X, dwtime=%d",
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304 | nr, caid, provid, sid, chid, dwtime);
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305 | nr++;
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306 | }
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307 | }
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308 | NULLFREE(token);
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309 | fclose(fp);
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310 |
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311 | last_cpmap = cfg.cpmap;
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312 | cfg.cpmap = first_cpmap;
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313 | for(cur_cpmap = last_cpmap; cur_cpmap; cur_cpmap = cur_cpmap->next)
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314 | { add_garbage(cur_cpmap); }
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315 | //cs_log("%d lengths for caid guessing loaded", nr);
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316 | return;
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317 | }
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318 |
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319 | void ac_copy_vars(struct s_auth *src, struct s_auth *dst)
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320 | {
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321 | dst->ac_stat = src->ac_stat;
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322 | }
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323 |
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324 | void ac_init(void)
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325 | {
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326 | if(!cfg.ac_enabled)
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327 | {
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328 | cs_log("anti cascading disabled");
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329 | return;
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330 | }
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331 |
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332 | ac_load_config();
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333 | ac_init_stat();
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334 | }
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335 |
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336 | #endif
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