76
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1
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2 /*
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3 * Copyright (C) Igor Sysoev
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4 */
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5
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6
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7 #include <ngx_config.h>
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8 #include <ngx_core.h>
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9 #include <ngx_event.h>
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10 #include <ngx_imap.h>
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11
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12
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13 ngx_int_t ngx_imap_parse_command(ngx_imap_session_t *s)
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14 {
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15 u_char ch, *p, *c;
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16 ngx_str_t *arg;
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17 enum {
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18 sw_start = 0,
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19 sw_spaces_before_command,
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20 sw_command,
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21 sw_spaces_before_argument,
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22 sw_argument,
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23 sw_literal,
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24 sw_start_literal_argument,
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25 sw_literal_argument,
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26 sw_end_literal_argument,
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27 sw_almost_done
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28 } state;
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29
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30 state = s->state;
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31
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32 for (p = s->buffer->pos; p < s->buffer->last; p++) {
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33 ch = *p;
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34
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35 switch (state) {
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36
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37 /* IMAP tag */
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38 case sw_start:
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39 switch (ch) {
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40 case ' ':
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41 s->tag.len = p - s->buffer->start + 1;
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42 s->tag.data = s->buffer->start;
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43 state = sw_spaces_before_command;
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44 break;
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45 case CR:
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46 s->state = sw_start;
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47 return NGX_IMAP_PARSE_INVALID_COMMAND;
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48 case LF:
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49 s->state = sw_start;
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50 return NGX_IMAP_PARSE_INVALID_COMMAND;
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51 }
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52 break;
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53
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54 case sw_spaces_before_command:
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55 switch (ch) {
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56 case ' ':
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57 break;
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58 case CR:
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59 s->state = sw_start;
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60 return NGX_IMAP_PARSE_INVALID_COMMAND;
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61 case LF:
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62 s->state = sw_start;
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63 return NGX_IMAP_PARSE_INVALID_COMMAND;
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64 default:
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65 s->cmd_start = p;
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66 state = sw_command;
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67 break;
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68 }
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69 break;
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70
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71 case sw_command:
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72 if (ch == ' ' || ch == CR || ch == LF) {
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73
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74 c = s->cmd_start;
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75
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76 switch (p - c) {
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77
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78 case 4:
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79 if ((c[0] == 'N' || c[0] == 'n')
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80 && (c[1] == 'O'|| c[1] == 'o')
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81 && (c[2] == 'O'|| c[2] == 'o')
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82 && (c[3] == 'P'|| c[3] == 'p'))
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83 {
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84 s->command = NGX_IMAP_NOOP;
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85
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86 } else {
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87 goto invalid;
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88 }
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89 break;
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90
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91 case 5:
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92 if ((c[0] == 'L'|| c[0] == 'l')
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93 && (c[1] == 'O'|| c[1] == 'o')
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94 && (c[2] == 'G'|| c[2] == 'g')
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95 && (c[3] == 'I'|| c[3] == 'i')
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96 && (c[4] == 'N'|| c[4] == 'n'))
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97 {
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98 s->command = NGX_IMAP_LOGIN;
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99
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100 } else {
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101 goto invalid;
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102 }
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103 break;
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104
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105 case 6:
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106 if ((c[0] == 'L'|| c[0] == 'l')
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107 && (c[1] == 'O'|| c[1] == 'o')
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108 && (c[2] == 'G'|| c[2] == 'g')
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109 && (c[3] == 'O'|| c[3] == 'o')
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110 && (c[4] == 'U'|| c[4] == 'u')
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111 && (c[5] == 'T'|| c[5] == 't'))
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112 {
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113 s->command = NGX_IMAP_LOGOUT;
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114
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115 } else {
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116 goto invalid;
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117 }
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118 break;
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119
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120 case 10:
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121 if ((c[0] == 'C'|| c[0] == 'c')
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122 && (c[1] == 'A'|| c[1] == 'a')
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123 && (c[2] == 'P'|| c[2] == 'p')
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124 && (c[3] == 'A'|| c[3] == 'a')
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125 && (c[4] == 'B'|| c[4] == 'b')
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126 && (c[5] == 'I'|| c[5] == 'i')
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127 && (c[6] == 'L'|| c[6] == 'l')
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128 && (c[7] == 'I'|| c[7] == 'i')
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129 && (c[8] == 'T'|| c[8] == 't')
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130 && (c[9] == 'Y'|| c[9] == 'y'))
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131 {
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132 s->command = NGX_IMAP_CAPABILITY;
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133
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134 } else {
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135 goto invalid;
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136 }
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137 break;
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138
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139 default:
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140 goto invalid;
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141 }
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142
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143 switch (ch) {
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144 case ' ':
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145 state = sw_spaces_before_argument;
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146 break;
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147 case CR:
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148 state = sw_almost_done;
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149 break;
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150 case LF:
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151 goto done;
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152 }
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153 break;
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154 }
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155
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156 if ((ch < 'A' || ch > 'Z') && (ch < 'a' || ch > 'z')) {
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157 goto invalid;
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158 }
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159
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160 break;
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161
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162 case sw_spaces_before_argument:
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163 switch (ch) {
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164 case ' ':
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165 break;
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166 case CR:
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167 state = sw_almost_done;
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168 s->arg_end = p;
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169 break;
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170 case LF:
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171 s->arg_end = p;
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172 goto done;
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173 case '"':
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174 if (s->args.nelts <= 2) {
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175 s->quoted = 1;
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176 s->arg_start = p + 1;
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177 state = sw_argument;
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178 break;
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179 }
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180 goto invalid;
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181 case '{':
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182 if (s->args.nelts <= 2) {
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183 state = sw_literal;
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184 break;
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185 }
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186 goto invalid;
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187 default:
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188 if (s->args.nelts <= 2) {
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189 s->arg_start = p;
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190 state = sw_argument;
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191 break;
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192 }
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193 goto invalid;
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194 }
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195 break;
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196
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197 case sw_argument:
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198 switch (ch) {
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199 case '"':
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200 if (!s->quoted) {
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201 break;
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202 }
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203 s->quoted = 0;
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204 /* fall through */
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205 case ' ':
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206 case CR:
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207 case LF:
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208 arg = ngx_array_push(&s->args);
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209 if (arg == NULL) {
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210 return NGX_ERROR;
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211 }
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212 arg->len = p - s->arg_start;
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213 arg->data = s->arg_start;
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214 s->arg_start = NULL;
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215
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216 switch (ch) {
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217 case '"':
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218 case ' ':
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219 state = sw_spaces_before_argument;
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220 break;
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221 case CR:
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222 state = sw_almost_done;
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223 break;
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224 case LF:
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225 goto done;
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226 }
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227 break;
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228 }
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229 break;
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230
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231 case sw_literal:
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232 if (ch >= '0' && ch <= '9') {
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233 s->literal_len = s->literal_len * 10 + (ch - '0');
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234 break;
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235 }
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236 if (ch == '}') {
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237 state = sw_start_literal_argument;
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238 break;
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239 }
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240 goto invalid;
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241
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242 case sw_start_literal_argument:
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243 switch (ch) {
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244 case CR:
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245 break;
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246 case LF:
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247 s->buffer->pos = p + 1;
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248 s->arg_start = p + 1;
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249 s->state = sw_literal_argument;
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250 return NGX_IMAP_NEXT;
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251 }
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252 goto invalid;
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253
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254 case sw_literal_argument:
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255 if (--s->literal_len) {
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256 break;
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257 }
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258
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259 arg = ngx_array_push(&s->args);
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260 if (arg == NULL) {
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261 return NGX_ERROR;
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262 }
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263 arg->len = p + 1 - s->arg_start;
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264 arg->data = s->arg_start;
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265 s->arg_start = NULL;
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266 state = sw_end_literal_argument;
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267
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268 break;
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269
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270 case sw_end_literal_argument:
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271 switch (ch) {
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272 case '{':
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273 if (s->args.nelts <= 2) {
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274 state = sw_literal;
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275 break;
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276 }
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277 goto invalid;
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278 case CR:
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279 state = sw_almost_done;
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280 break;
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281 case LF:
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282 goto done;
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283 default:
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284 goto invalid;
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285 }
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286 break;
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287
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288 case sw_almost_done:
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289 switch (ch) {
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290 case LF:
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291 goto done;
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292 default:
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293 goto invalid;
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294 }
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295 }
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296 }
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297
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298 s->buffer->pos = p;
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299 s->state = state;
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300
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301 return NGX_AGAIN;
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302
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303 done:
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304
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305 s->buffer->pos = p + 1;
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306
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307 if (s->arg_start) {
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308 arg = ngx_array_push(&s->args);
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309 if (arg == NULL) {
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310 return NGX_ERROR;
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311 }
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312 arg->len = s->arg_end - s->arg_start;
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313 arg->data = s->arg_start;
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314 s->arg_start = NULL;
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315 s->cmd_start = NULL;
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316 s->quoted = 0;
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317 s->literal_len = 0;
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318 }
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319
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320 s->state = sw_start;
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321
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322 return NGX_OK;
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323
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324 invalid:
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325
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326 s->state = sw_start;
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327 s->quoted = 0;
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328 s->literal_len = 0;
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329
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330 return NGX_IMAP_PARSE_INVALID_COMMAND;
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331 }
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332
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333
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334 ngx_int_t ngx_pop3_parse_command(ngx_imap_session_t *s)
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335 {
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336 u_char ch, *p, *c, c0, c1, c2, c3;
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337 ngx_str_t *arg;
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338 enum {
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339 sw_start = 0,
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340 sw_spaces_before_argument,
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341 sw_argument,
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342 sw_almost_done
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343 } state;
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344
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345 state = s->state;
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346
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347 for (p = s->buffer->pos; p < s->buffer->last; p++) {
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348 ch = *p;
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349
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350 switch (state) {
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351
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352 /* POP3 command */
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353 case sw_start:
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354 if (ch == ' ' || ch == CR || ch == LF) {
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355 c = s->buffer->start;
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356
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357 if (p - c == 4) {
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358
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359 c0 = ngx_toupper(c[0]);
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360 c1 = ngx_toupper(c[1]);
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361 c2 = ngx_toupper(c[2]);
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362 c3 = ngx_toupper(c[3]);
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363
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364 if (c0 == 'U' && c1 == 'S' && c2 == 'E' && c3 == 'R')
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365 {
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366 s->command = NGX_POP3_USER;
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367
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368 } else if (c0 == 'P' && c1 == 'A' && c2 == 'S' && c3 == 'S')
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369 {
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370 s->command = NGX_POP3_PASS;
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371
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372 } else if (c0 == 'Q' && c1 == 'U' && c2 == 'I' && c3 == 'T')
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373 {
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374 s->command = NGX_POP3_QUIT;
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375
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376 } else if (c0 == 'C' && c1 == 'A' && c2 == 'P' && c3 == 'A')
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377 {
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378 s->command = NGX_POP3_CAPA;
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379
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380 } else if (c0 == 'N' && c1 == 'O' && c2 == 'O' && c3 == 'P')
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381 {
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382 s->command = NGX_POP3_NOOP;
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383
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384 } else {
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385 goto invalid;
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386 }
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387
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388 } else {
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389 goto invalid;
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390 }
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391
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392 switch (ch) {
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393 case ' ':
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394 state = sw_spaces_before_argument;
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395 break;
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396 case CR:
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397 state = sw_almost_done;
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398 break;
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399 case LF:
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400 goto done;
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401 }
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402 break;
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403 }
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404
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405 if ((ch < 'A' || ch > 'Z') && (ch < 'a' || ch > 'z')) {
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406 goto invalid;
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407 }
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408
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409 break;
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410
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411 case sw_spaces_before_argument:
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412 switch (ch) {
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413 case ' ':
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414 break;
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415 case CR:
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416 state = sw_almost_done;
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417 s->arg_end = p;
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418 break;
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419 case LF:
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420 s->arg_end = p;
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421 goto done;
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422 default:
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423 if (s->args.nelts <= 2) {
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424 state = sw_argument;
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425 s->arg_start = p;
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426 break;
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427 }
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428 goto invalid;
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429 }
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430 break;
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431
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432 case sw_argument:
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433 switch (ch) {
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434 case ' ':
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435 case CR:
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436 case LF:
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437 arg = ngx_array_push(&s->args);
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438 if (arg == NULL) {
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439 return NGX_ERROR;
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440 }
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441 arg->len = p - s->arg_start;
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442 arg->data = s->arg_start;
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443 s->arg_start = NULL;
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444
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445 switch (ch) {
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446 case ' ':
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447 state = sw_spaces_before_argument;
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448 break;
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449 case CR:
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450 state = sw_almost_done;
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451 break;
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452 case LF:
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453 goto done;
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454 }
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455 break;
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456
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457 default:
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458 break;
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459 }
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460 break;
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461
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462 case sw_almost_done:
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463 switch (ch) {
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464 case LF:
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465 goto done;
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466 default:
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467 goto invalid;
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468 }
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469 }
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470 }
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471
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472 s->buffer->pos = p;
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473 s->state = state;
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474
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475 return NGX_AGAIN;
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476
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477 done:
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478
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479 s->buffer->pos = p + 1;
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480
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481 if (s->arg_start) {
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482 arg = ngx_array_push(&s->args);
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483 if (arg == NULL) {
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484 return NGX_ERROR;
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485 }
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486 arg->len = s->arg_end - s->arg_start;
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487 arg->data = s->arg_start;
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488 s->arg_start = NULL;
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489 }
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490
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491 s->state = sw_start;
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492
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493 return NGX_OK;
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494
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495 invalid:
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496
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497 s->state = sw_start;
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498
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499 return NGX_IMAP_PARSE_INVALID_COMMAND;
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500 }
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