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adds support for CGI with request bodies
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1 | /* |
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2 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER. |
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3 | * |
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4 | * Copyright 2016 Olaf Wintermann. All rights reserved. |
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5 | * |
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6 | * Redistribution and use in source and binary forms, with or without |
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7 | * modification, are permitted provided that the following conditions are met: |
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8 | * |
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9 | * 1. Redistributions of source code must retain the above copyright |
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10 | * notice, this list of conditions and the following disclaimer. |
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11 | * |
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12 | * 2. Redistributions in binary form must reproduce the above copyright |
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13 | * notice, this list of conditions and the following disclaimer in the |
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14 | * documentation and/or other materials provided with the distribution. |
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15 | * |
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16 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
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17 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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18 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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19 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE |
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20 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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21 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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22 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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23 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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24 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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25 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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26 | * POSSIBILITY OF SUCH DAMAGE. |
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27 | */ |
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28 | |
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29 | #include "cgi.h" |
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30 | |
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31 | #include <stdio.h> |
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32 | #include <stdlib.h> |
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33 | #include <unistd.h> |
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34 | |
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35 | #include "../util/util.h" |
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36 | #include "../util/pblock.h" |
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37 | #include "../../ucx/string.h" |
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38 | |
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39 | #include "cgiutils.h" |
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40 | |
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41 | #define CGI_VARS 32 |
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42 | |
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43 | #define CGI_RESPONSE_PARSER_BUFLEN 2048 |
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44 | #define CGI_RESPONSE_MAX_LINE_LENGTH 512 |
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45 | |
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46 | int send_cgi(pblock *pb, Session *sn, Request *rq) { |
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47 | char *path = pblock_findkeyval(pb_key_path, rq->vars); |
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48 | char *ctlen = pblock_findkeyval(pb_key_content_length, rq->headers); |
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49 | int64_t content_length = 0; |
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50 | |
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51 | if(ctlen) { |
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52 | if(!util_strtoint(ctlen, &content_length)) { |
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53 | log_ereport( |
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54 | LOG_FAILURE, |
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55 | "send-cgi: content-length header is not an integer"); |
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56 | protocol_status(sn, rq, 400, NULL); |
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57 | return REQ_ABORTED; |
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58 | } |
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59 | } |
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60 | |
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61 | struct stat s; |
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62 | if(stat(path, &s)) { |
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63 | int statuscode = util_errno2status(errno); |
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64 | protocol_status(sn, rq, statuscode, NULL); |
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65 | return REQ_ABORTED; |
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66 | } |
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67 | if(S_ISDIR(s.st_mode)) { |
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68 | protocol_status(sn, rq, 403, NULL); |
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69 | return REQ_ABORTED; |
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70 | } |
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71 | |
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72 | param_free(pblock_remove("content-type", rq->srvhdrs)); |
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73 | |
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74 | const char *args = pblock_findval("query", rq->reqpb); |
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75 | char **argv = cgi_create_argv(path, NULL, args); |
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76 | |
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77 | char **env = http_hdrs2env(rq->headers); |
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78 | env = cgi_common_vars(sn, rq, env); |
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79 | env = cgi_specific_vars(sn, rq, args, env, 1); |
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80 | |
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81 | CGIProcess cgip; |
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82 | int ret = cgi_start(&cgip, path, argv, env); |
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83 | if(ret != REQ_PROCEED) { |
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84 | return ret; |
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85 | } |
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86 | |
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87 | char buf[4096]; // I/O buffer |
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88 | ssize_t r; |
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89 | |
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90 | if(content_length > 0) { |
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91 | ssize_t n = 0; |
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92 | while(n < content_length) { |
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93 | r = netbuf_getbytes(sn->inbuf, buf, 4096); |
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94 | if(r <= 0) { |
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95 | // TODO: handleerror |
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96 | return REQ_ABORTED; |
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97 | } |
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98 | write(cgip.in[1], buf, r); |
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99 | n += r; |
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100 | } |
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101 | } |
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102 | close(cgip.in[1]); |
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103 | |
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104 | // read from child |
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105 | CGIResponseParser *parser = cgi_parser_new(sn, rq); |
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106 | WSBool cgiheader = TRUE; |
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107 | |
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108 | while((r = read(cgip.out[0], buf, 4096)) > 0) { |
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109 | if(cgiheader) { |
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110 | size_t pos; |
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111 | int ret = cgi_parse_response(parser, buf, r, &pos); |
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112 | if(ret == -1) { |
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113 | protocol_status(sn, rq, 500, NULL); |
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114 | return REQ_ABORTED; |
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115 | } else if(ret == 0) { |
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116 | |
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117 | } else if(ret == 1) { |
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118 | cgiheader = FALSE; |
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119 | http_start_response(sn, rq); |
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120 | if(pos < r) { |
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121 | net_write(sn->csd, buf+pos, r-pos); |
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122 | } |
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123 | } |
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124 | } else { |
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125 | net_write(sn->csd, buf, r); |
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126 | } |
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127 | } |
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128 | |
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129 | return REQ_PROCEED; |
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130 | } |
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131 | |
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132 | int cgi_start(CGIProcess *p, char *path, char *const argv[], char *const envp[]) { |
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133 | if(pipe(p->in) || pipe(p->out)) { |
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134 | log_ereport( |
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135 | LOG_FAILURE, |
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136 | "send-cgi: cannot create pipe: %s", |
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137 | strerror(errno)); |
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138 | return REQ_ABORTED; |
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139 | } |
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140 | |
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141 | p->pid = fork(); |
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142 | if(p->pid == 0) { |
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143 | // child |
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144 | if(dup2(p->in[0], STDIN_FILENO) == -1) { |
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145 | perror("cgi_start: dup2"); |
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146 | exit(EXIT_FAILURE); |
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147 | } |
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148 | if(dup2(p->out[1], STDOUT_FILENO) == -1) { |
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149 | perror("cgi_start: dup2"); |
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150 | exit(EXIT_FAILURE); |
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151 | } |
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152 | |
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153 | // we need to close this unused pipe |
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154 | // otherwise stdin cannot reach EOF |
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155 | close(p->in[1]); |
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156 | |
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157 | // execute program |
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158 | exit(execve(path, argv, envp)); |
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159 | } else { |
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160 | // parent |
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161 | close(p->out[1]); |
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162 | } |
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163 | |
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164 | return REQ_PROCEED; |
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165 | } |
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166 | |
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167 | CGIResponseParser* cgi_parser_new(Session *sn, Request *rq) { |
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168 | CGIResponseParser* parser = pool_malloc(sn->pool, sizeof(CGIResponseParser)); |
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169 | parser->sn = sn; |
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170 | parser->rq = rq; |
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171 | parser->tmp = ucx_buffer_new(NULL, 64, UCX_BUFFER_AUTOEXTEND); |
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172 | return parser; |
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173 | } |
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174 | |
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175 | /* |
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176 | * parses a cgi response line and adds the response header to rq->srvhdrs |
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177 | * returns 0: incomplete line |
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178 | * 1: successfully parsed lines |
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179 | * 2: cgi response header complete (empty line) |
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180 | * -1: error |
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181 | */ |
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182 | static int parse_lines(CGIResponseParser *parser, char *buf, size_t len, int *pos) { |
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183 | sstr_t name; |
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184 | sstr_t value; |
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185 | WSBool space = TRUE; |
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186 | int i; |
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187 | |
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188 | int line_begin = 0; |
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189 | int value_begin = 0; |
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190 | for(i=0;i<len;i++) { |
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191 | char c = buf[i]; |
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192 | if(value_begin == line_begin && c == ':') { |
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193 | name = sstrn(buf + line_begin, i - line_begin); |
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194 | value_begin = i + 1; |
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195 | } else if(c == '\n') { |
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196 | if(value_begin == line_begin) { |
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197 | if(space) { |
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198 | *pos = i + 1; |
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199 | return 2; |
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200 | } else { |
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201 | // line ends with content but without ':' -> error |
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202 | return -1; |
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203 | } |
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204 | } |
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205 | value = sstrn(buf + value_begin, i - value_begin); |
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206 | |
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207 | name = sstrtrim(name); |
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208 | value = sstrtrim(value); |
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209 | |
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210 | if(name.length == 0 || value.length == 0) { |
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211 | return -1; |
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212 | } |
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213 | pblock_nvlinsert( |
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214 | name.ptr, |
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215 | name.length, |
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216 | value.ptr, |
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217 | value.length, |
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218 | parser->rq->srvhdrs); |
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219 | |
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220 | line_begin = i+1; |
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221 | value_begin = line_begin; |
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222 | space = TRUE; |
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223 | } else if(c != ' ') { |
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224 | space = FALSE; |
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225 | } |
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226 | } |
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227 | |
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228 | if(i < len) { |
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229 | *pos = i; |
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230 | return 0; |
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231 | } |
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232 | return 1; |
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233 | } |
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234 | |
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235 | /* |
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236 | * returns -1: error |
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237 | * 0: response header incomplete |
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238 | * 1: complete |
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239 | */ |
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240 | int cgi_parse_response(CGIResponseParser *parser, char *buf, size_t len, size_t *bpos) { |
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241 | *bpos = 0; |
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242 | int pos = 0; |
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243 | if(parser->tmp->pos > 0) { |
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244 | // the tmp buffer contains an unfinished line |
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245 | // fill up the buffer until the line is complete |
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246 | WSBool nb = FALSE; |
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247 | for(pos=0;pos<len;pos++) { |
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248 | if(buf[pos] == '\n') { |
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249 | nb = TRUE; |
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250 | break; |
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251 | } |
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252 | } |
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253 | ucx_buffer_write(buf, 1, pos, parser->tmp); |
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254 | |
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255 | if(nb) { |
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256 | // line complete |
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257 | int npos; |
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258 | int r = parse_lines(parser, parser->tmp->space, parser->tmp->pos, &npos); |
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259 | switch(r) { |
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260 | case -1: return -1; |
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261 | case 0: return -1; |
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262 | case 1: break; |
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263 | case 2: { |
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264 | *bpos = pos + 1; |
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265 | return 1; |
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266 | } |
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267 | } |
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268 | // reset tmp buffer |
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269 | parser->tmp->pos = 0; |
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270 | } else { |
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271 | if(parser->tmp->pos > CGI_RESPONSE_MAX_LINE_LENGTH) { |
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272 | return -1; |
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273 | } |
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274 | } |
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275 | } |
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276 | |
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277 | int npos = 0; |
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278 | int r = parse_lines(parser, buf + pos, len - pos, &npos); |
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279 | switch(r) { |
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280 | default: return -1; |
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281 | case 0: |
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282 | case 1: { |
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283 | int newlen = len - npos; |
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284 | if(npos > 0) { |
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285 | ucx_buffer_write(buf + npos, 1, newlen, parser->tmp); |
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286 | } |
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287 | return 0; |
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288 | } |
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289 | case 2: { |
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290 | *bpos = pos + npos; |
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291 | return 1; |
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292 | } |
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293 | } |
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294 | } |
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295 |