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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_http.h>
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10 #include <ngx_http_proxy_handler.h>
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11
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12
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13 int ngx_http_proxy_parse_status_line(ngx_http_proxy_ctx_t *p)
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14 {
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15 u_char ch;
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16 u_char *pos;
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17 enum {
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18 sw_start = 0,
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19 sw_H,
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20 sw_HT,
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21 sw_HTT,
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22 sw_HTTP,
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23 sw_first_major_digit,
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24 sw_major_digit,
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25 sw_first_minor_digit,
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26 sw_minor_digit,
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27 sw_status,
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28 sw_space_after_status,
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29 sw_status_text,
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30 sw_almost_done,
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31 sw_done
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32 } state;
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33
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34 state = p->parse_state;
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35 pos = p->header_in->pos;
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36
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37 while (pos < p->header_in->last && state < sw_done) {
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38 ch = *pos++;
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39
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40 switch (state) {
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41
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42 /* "HTTP/" */
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43 case sw_start:
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44 switch (ch) {
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45 case 'H':
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46 state = sw_H;
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47 break;
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48 default:
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49 return NGX_HTTP_PROXY_PARSE_NO_HEADER;
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50 }
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51 break;
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52
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53 case sw_H:
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54 switch (ch) {
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55 case 'T':
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56 state = sw_HT;
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57 break;
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58 default:
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59 return NGX_HTTP_PROXY_PARSE_NO_HEADER;
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60 }
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61 break;
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62
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63 case sw_HT:
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64 switch (ch) {
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65 case 'T':
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66 state = sw_HTT;
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67 break;
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68 default:
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69 return NGX_HTTP_PROXY_PARSE_NO_HEADER;
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70 }
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71 break;
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72
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73 case sw_HTT:
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74 switch (ch) {
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75 case 'P':
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76 state = sw_HTTP;
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77 break;
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78 default:
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79 return NGX_HTTP_PROXY_PARSE_NO_HEADER;
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80 }
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81 break;
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82
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83 case sw_HTTP:
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84 switch (ch) {
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85 case '/':
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86 state = sw_first_major_digit;
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87 break;
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88 default:
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89 return NGX_HTTP_PROXY_PARSE_NO_HEADER;
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90 }
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91 break;
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92
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93 /* the first digit of major HTTP version */
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94 case sw_first_major_digit:
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95 if (ch < '1' || ch > '9') {
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96 return NGX_HTTP_PROXY_PARSE_NO_HEADER;
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97 }
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98
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99 state = sw_major_digit;
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100 break;
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101
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102 /* the major HTTP version or dot */
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103 case sw_major_digit:
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104 if (ch == '.') {
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105 state = sw_first_minor_digit;
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106 break;
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107 }
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108
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109 if (ch < '0' || ch > '9') {
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110 return NGX_HTTP_PROXY_PARSE_NO_HEADER;
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111 }
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112
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113 break;
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114
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115 /* the first digit of minor HTTP version */
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116 case sw_first_minor_digit:
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117 if (ch < '0' || ch > '9') {
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118 return NGX_HTTP_PROXY_PARSE_NO_HEADER;
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119 }
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120
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121 state = sw_minor_digit;
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122 break;
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123
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124 /* the minor HTTP version or the end of the request line */
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125 case sw_minor_digit:
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126 if (ch == ' ') {
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127 state = sw_status;
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128 break;
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129 }
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130
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131 if (ch < '0' || ch > '9') {
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132 return NGX_HTTP_PROXY_PARSE_NO_HEADER;
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133 }
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134
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135 break;
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136
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137 /* HTTP status code */
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138 case sw_status:
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139 if (ch < '0' || ch > '9') {
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140 return NGX_HTTP_PROXY_PARSE_NO_HEADER;
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141 }
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142
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143 p->status = p->status * 10 + ch - '0';
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144
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145 if (++p->status_count == 3) {
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146 state = sw_space_after_status;
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147 p->status_start = pos - 3;
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148 }
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149
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150 break;
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151
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152 /* space or end of line */
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153 case sw_space_after_status:
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154 switch (ch) {
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155 case ' ':
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156 state = sw_status_text;
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157 break;
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2
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158 case '.': /* IIS may send 403.1, 403.2, etc */
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159 state = sw_status_text;
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160 break;
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0
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161 case CR:
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162 state = sw_almost_done;
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163 break;
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164 case LF:
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165 state = sw_done;
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166 break;
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167 default:
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168 return NGX_HTTP_PROXY_PARSE_NO_HEADER;
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169 }
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170 break;
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171
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172 /* any text until end of line */
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173 case sw_status_text:
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174 switch (ch) {
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175 case CR:
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176 state = sw_almost_done;
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177
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178 break;
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179 case LF:
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180 state = sw_done;
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181 break;
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182 }
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183 break;
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184
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185 /* end of request line */
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186 case sw_almost_done:
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187 p->status_end = pos - 2;
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188 switch (ch) {
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189 case LF:
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190 state = sw_done;
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191 break;
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192 default:
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193 return NGX_HTTP_PROXY_PARSE_NO_HEADER;
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194 }
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195 break;
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196
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197 /* suppress warning */
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198 case sw_done:
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199 break;
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200 }
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201 }
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202
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203 p->header_in->pos = pos;
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204
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205 if (state == sw_done) {
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206 if (p->status_end == NULL) {
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207 p->status_end = pos - 1;
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208 }
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209
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210 p->parse_state = sw_start;
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211 return NGX_OK;
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212 }
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213
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214 p->parse_state = state;
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215 return NGX_AGAIN;
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216 }
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