src/server/daemon/sessionhandler.c

Wed, 26 Oct 2016 15:53:56 +0200

author
Olaf Wintermann <olaf.wintermann@gmail.com>
date
Wed, 26 Oct 2016 15:53:56 +0200
changeset 118
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parent 114
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child 128
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permissions
-rw-r--r--

adds minimal cgi implementation

some env vars still missing
request body not supported yet

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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 2013 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 <stdio.h>
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30 #include <stdlib.h>
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31 #include <errno.h>
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32
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33 #include "../public/nsapi.h"
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34
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35 #include "sessionhandler.h"
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36 #include "httprequest.h"
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37 #include "httpparser.h"
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38 #include "log.h"
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39 #include "error.h"
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40 #include "httplistener.h"
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41
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42 typedef struct _event_http_io {
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43 HTTPRequest *request;
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44 HttpParser *parser;
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45 } EventHttpIO;
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46
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47
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48 int connection_read(Connection *conn, void *buf, int len) {
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49 return (int)read(conn->fd, buf, len);
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50 }
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51
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52 int connection_write(Connection *conn, const void *buf, int len) {
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53 return (int)write(conn->fd, buf, len);
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54 }
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55
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56 void connection_close(Connection *conn) {
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57 close(conn->fd);
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58 }
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59
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60 int connection_ssl_read(Connection *conn, void *buf, int len) {
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61 return SSL_read(conn->ssl, buf, len);
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62 }
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63
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64 int connection_ssl_write(Connection *conn, const void *buf, int len) {
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65 return SSL_write(conn->ssl, buf, len);
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66 }
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67
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68 void connection_ssl_close(Connection *conn) {
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69 SSL_shutdown(conn->ssl);
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70 close(conn->fd);
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71 }
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72
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73 void connection_destroy(Connection *conn) {
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74 if(conn->ssl) {
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75 SSL_free(conn->ssl);
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76 }
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77 conn->close(conn);
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78
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79 free(conn);
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80 }
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81
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82 SessionHandler* create_basic_session_handler() {
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83 BasicSessionHandler *handler = malloc(sizeof(BasicSessionHandler));
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84 handler->threadpool = threadpool_new(4, 8);
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85 handler->sh.enqueue_connection = basic_enq_conn;
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86 handler->sh.keep_alive = basic_keep_alive;
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87
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88 return (SessionHandler*)handler;
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89 }
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90
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91 void basic_enq_conn(SessionHandler *handler, Connection *conn) {
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92 BasicSessionHandler *sh = (BasicSessionHandler*)handler;
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93 conn->session_handler = handler;
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94 threadpool_run(sh->threadpool, basic_run_session, conn);
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95 }
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96
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97 void* basic_run_session(void *data) {
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98 Connection *conn = (Connection*)data;
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99
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100 HTTPRequest request;
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101 http_request_init(&request);
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102 request.connection = conn;
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103
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104 // read request
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105 netbuf *buf = malloc(sizeof(netbuf));
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106 buf->rdtimeout = 120;
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107 buf->pos = 0;
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108 buf->cursize = 0;
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109 buf->maxsize = 2048;
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110 buf->sd = &conn->fd;
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111 buf->inbuf = malloc(2048);
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112 buf->errmsg = NULL;
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113
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114 request.netbuf = buf;
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115
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116 HttpParser *parser = http_parser_new(&request);
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117 int state;
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118 int r;
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119 r = conn->read(conn, buf->inbuf + buf->pos, buf->maxsize - buf->pos);
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120 if(r <= 0) {
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121 // TODO: error handling
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122 fprintf(stderr, "%s\n", "Error: Cannot read from socket");
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123 return NULL;
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124 }
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125 buf->cursize += r;
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126 while((state = http_parser_process(parser)) != 0) {
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127 if(state == 2) {
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128 // TODO: error handling
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129 fprintf(stderr, "%s\n", "Error: Cannot parse http request");
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130 return NULL;
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131 }
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132 r = conn->read(conn, buf->inbuf + buf->pos, buf->maxsize - buf->pos);
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133 if(r == -1) {
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134 // TODO: error handling
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135 fprintf(stderr, "%s\n", "Error: Cannot read from socket");
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136 return NULL;
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137 }
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138 buf->cursize += r;
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139 }
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140
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141 // process request
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142 r = handle_request(&request, NULL); // TODO: use correct thread pool
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143
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144 // TODO: free, see evt_request_finish
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145
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146 return NULL;
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147 }
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148
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149 void basic_keep_alive(SessionHandler *handler, Connection *conn) {
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150
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151 }
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152
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153
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154 /* ----- event session handler ----- */
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155
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156 SessionHandler* create_event_session_handler() {
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157 EventSessionHandler *handler = malloc(sizeof(EventSessionHandler));
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158 handler->eventhandler = get_default_event_handler();
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159 handler->sh.enqueue_connection = evt_enq_conn;
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160 handler->sh.keep_alive = evt_keep_alive;
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161 return (SessionHandler*)handler;
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162 }
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163
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164 void evt_enq_conn(SessionHandler *handler, Connection *conn) {
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165 HTTPRequest *request = malloc(sizeof(HTTPRequest));
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166 http_request_init(request);
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167 request->connection = conn;
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168 conn->session_handler = handler;
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169
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170 // set socket non blocking
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171 int flags;
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172 if (-1 == (flags = fcntl(conn->fd, F_GETFL, 0))) {
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173 flags = 0;
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174 }
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175 if (fcntl(conn->fd, F_SETFL, flags | O_NONBLOCK) != 0) {
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176 perror("Error: start_event_session: fcntl");
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177 // TODO: error
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178 }
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179
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180 // TODO: remove code redundancy (basic_run_session)
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181
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182 // read request
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183 netbuf *buf = malloc(sizeof(netbuf));
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184 buf->rdtimeout = 120;
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185 buf->pos = 0;
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186 buf->cursize = 0;
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187 buf->maxsize = 2048;
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188 buf->sd = &conn->fd;
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189 buf->inbuf = malloc(2048);
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190 buf->errmsg = NULL;
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191
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192 request->netbuf = buf;
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193
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194 HttpParser *parser = http_parser_new(request);
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195
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196 EventHttpIO *io = malloc(sizeof(EventHttpIO));
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197 if(io == NULL) {
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198 // TODO: error handling
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199 }
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200 io->request = request;
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201 io->parser = parser;
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202
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203 /*
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204 * to start the request handling, we begin with a poll on the socket,
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205 *
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206 * evt_enq_conn() --> event handler --> handle_request()
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207 */
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208
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209 event_handler_t *ev = ((EventSessionHandler*)handler)->eventhandler;
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210
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211 event_t *event = malloc(sizeof(event_t));
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212 event->fn = evt_request_input;
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213 event->finish = evt_request_finish;
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214 event->cookie = io;
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215
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216 if(ev_pollin(ev, conn->fd, event) != 0) {
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217 // TODO: ev_pollin should log, intercept some errors here
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218 log_ereport(LOG_WARN, "ev_pollin failed: %s", strerror(errno));
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219 close(conn->fd);
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220 // TODO: free stuff
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221 }
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222 }
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223
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224 int evt_request_input(event_handler_t *handler, event_t *event) {
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225 EventHttpIO *io = event->cookie;
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226 HttpParser *parser = io->parser;
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227 HTTPRequest *request = io->request;
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228 Connection *conn = io->request->connection;
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229 netbuf *buf = request->netbuf;
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230
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231 int state;
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232 int r;
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233 r = conn->read(
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234 conn,
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235 buf->inbuf + buf->pos,
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236 buf->maxsize - buf->pos);
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237 if(r <= 0) {
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238 event->finish = evt_request_error;
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239 return 0;
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240 }
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241 //fwrite(buf->inbuf + buf->pos, 1, r, stdout);
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242 //printf("\n");
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243
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244 buf->cursize += r;
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245 state = http_parser_process(parser);
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246 if(state == 2) {
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247 // parse error
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248 fatal_error(request, 400);
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249 event->finish = evt_request_error;
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250 return 0;
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251 } else if(state == 1) {
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252 /*
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253 * we need more data -> return 1 to tell the event handler to
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254 * continue polling
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255 */
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256 return 1;
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257 }
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258
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259 // we are done with reading
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260
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261 // set socket blocking
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262 int flags;
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263 if (-1 == (flags = fcntl(request->connection->fd, F_GETFL, 0))) {
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264 flags = 0;
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265 }
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266 if (fcntl(request->connection->fd, F_SETFL, flags & ~O_NONBLOCK) != 0) {
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267 // just close the connection if fcntl fails
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268 event->finish = evt_request_error;
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269 return 0;
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270 }
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271
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272 /*
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273 * process request
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274 *
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275 * We return 0 to finish request input. The event handler than stops
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276 * polling and executes event->finish (evt_request_input_finish)
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277 */
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278 return 0;
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279 }
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280
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281 int evt_request_finish(event_handler_t *h, event_t *event) {
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282 EventHttpIO *io = event->cookie;
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283 HttpParser *parser = io->parser;
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284 HTTPRequest *request = io->request;
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285
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286 int r = handle_request(request, NULL);
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287 if(r != 0) {
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288 // TODO: error message
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289 close(request->connection->fd);
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290 }
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291
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292 /*
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293 * handle_request can return before the request is finished, but it copies
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294 * all important data. We can free request, parser and event
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295 *
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296 * don't free request->netbuf and request->connection
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297 */
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298 http_request_cleanup(request);
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299 http_parser_free(parser);
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300
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301 free(io);
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302 free(event);
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303
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304 return 0;
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305 }
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306
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307 int evt_request_error(event_handler_t *h, event_t *event) {
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308 EventHttpIO *io = event->cookie;
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309 HttpParser *parser = io->parser;
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310 HTTPRequest *request = io->request;
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311
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312 free(request->netbuf->inbuf);
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313 free(request->netbuf);
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314
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315 cfg_unref(request->connection->listener->cfg);
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316 connection_destroy(request->connection);
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317
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318 http_request_cleanup(request);
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319 http_parser_free(parser);
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320
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321 free(io);
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322 free(event);
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323
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324 return 0;
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325 }
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326
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327 void evt_keep_alive(SessionHandler *handler, Connection *conn) {
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328 // TODO: set timeout
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329
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330 /* TODO:
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331 * Don't just re-enqueue the connection
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332 * create a evt_req_init function which does most of the evt_enq_conn stuff
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333 * but don't poll.
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334 * evt_keep_alive should poll and if an event occurs:
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335 * evt_req_init
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336 * evt_request_input
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337 * evt_enq_conn should do:
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338 * evt_req_init
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339 * ev_pollin
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340 */
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341 evt_enq_conn(handler, conn);
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342 }

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