src/server/daemon/sessionhandler.c

Sat, 24 Sep 2022 16:26:10 +0200

author
Olaf Wintermann <olaf.wintermann@gmail.com>
date
Sat, 24 Sep 2022 16:26:10 +0200
changeset 385
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parent 357
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child 410
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permissions
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merge branch webdav into default

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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 int error;
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46 } EventHttpIO;
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47
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48
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49 int connection_read(Connection *conn, void *buf, int len) {
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50 return (int)read(conn->fd, buf, len);
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51 }
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52
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53 int connection_write(Connection *conn, const void *buf, int len) {
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54 return (int)write(conn->fd, buf, len);
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55 }
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56
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57 void connection_close(Connection *conn) {
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58 while(close(conn->fd)) {
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59 if(errno != EINTR) {
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60 log_ereport(LOG_VERBOSE, "connection close failed: %s", strerror(errno));
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61 break;
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62 }
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63 log_ereport(LOG_VERBOSE, "connection close: EINTR");
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64 }
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65 }
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66
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67 int connection_ssl_read(Connection *conn, void *buf, int len) {
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68 int ret = SSL_read(conn->ssl, buf, len);
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69 if(ret <= 0) {
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70 conn->ssl_error = SSL_get_error(conn->ssl, ret);
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71 }
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72 return ret;
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73 }
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74
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75 int connection_ssl_write(Connection *conn, const void *buf, int len) {
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76 int ret = SSL_write(conn->ssl, buf, len);
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77 if(ret <= 0) {
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78 conn->ssl_error = SSL_get_error(conn->ssl, ret);
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79 }
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80 return ret;
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81 }
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82
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83 void connection_ssl_close(Connection *conn) {
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84 if(!conn->ssl_error) {
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85 int ret = SSL_shutdown(conn->ssl);
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86 if(ret != 1) {
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87 conn->ssl_error = SSL_get_error(conn->ssl, ret);
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88 log_ereport(LOG_VERBOSE, "SSL_shutdown failed: %d", conn->ssl_error);
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89 }
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90 }
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91 while(close(conn->fd)) {
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92 if(errno != EINTR) {
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93 log_ereport(LOG_VERBOSE, "connection close failed: %s", strerror(errno));
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94 break;
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95 }
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96 log_ereport(LOG_VERBOSE, "connection close: EINTR");
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97 }
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98 }
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99
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100 void connection_destroy(Connection *conn) {
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101 conn->close(conn);
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102 if(conn->ssl) {
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103 SSL_free(conn->ssl);
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104 }
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105 free(conn);
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106 }
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107
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108 IOStream* create_connection_iostream(
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109 SessionHandler *sh,
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110 Connection *conn,
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111 pool_handle_t *pool,
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112 WSBool *ssl)
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113 {
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114 IOStream *io = NULL;
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115 if(conn->ssl) {
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116 io = sslstream_new(pool, conn->ssl);
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117 *ssl = 1;
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118 } else {
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119 io = sysstream_new(pool, conn->fd);
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120 *ssl = 0;
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121 }
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122 return io;
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123 }
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124
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125
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126 SessionHandler* create_basic_session_handler() {
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127 BasicSessionHandler *handler = malloc(sizeof(BasicSessionHandler));
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128 handler->threadpool = threadpool_new(4, 8);
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129 threadpool_start(handler->threadpool); // TODO: handle error
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130 handler->sh.enqueue_connection = basic_enq_conn;
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131 handler->sh.keep_alive = basic_keep_alive;
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132 handler->sh.create_iostream = create_connection_iostream;
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133
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134 return (SessionHandler*)handler;
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135 }
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136
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137 void basic_enq_conn(SessionHandler *handler, Connection *conn) {
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138 BasicSessionHandler *sh = (BasicSessionHandler*)handler;
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139 conn->session_handler = handler;
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140 threadpool_run(sh->threadpool, basic_run_session, conn);
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141 }
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142
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143 void* basic_run_session(void *data) {
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144 Connection *conn = (Connection*)data;
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145
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146 HTTPRequest request;
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147 http_request_init(&request);
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148 request.connection = conn;
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149
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150 // read request
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151 netbuf *buf = malloc(sizeof(netbuf));
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152 buf->rdtimeout = 120;
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153 buf->pos = 0;
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154 buf->cursize = 0;
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155 buf->maxsize = 2048;
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156 buf->sd = &conn->fd;
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157 buf->inbuf = malloc(2048);
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158 buf->errmsg = NULL;
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159
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160 request.netbuf = buf;
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161
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162 HttpParser *parser = http_parser_new(&request);
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163 int state;
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164 int r;
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165 r = conn->read(conn, buf->inbuf + buf->pos, buf->maxsize - buf->pos);
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166 if(r <= 0) {
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167 // TODO: error handling
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168 fprintf(stderr, "%s\n", "Error: Cannot read from socket");
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169 return NULL;
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170 }
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171 buf->cursize += r;
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172 while((state = http_parser_process(parser)) != 0) {
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173 if(state == 2) {
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174 // TODO: error handling
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175 fprintf(stderr, "%s\n", "Error: Cannot parse http request");
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176 return NULL;
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177 }
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178 r = conn->read(conn, buf->inbuf + buf->pos, buf->maxsize - buf->pos);
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179 if(r == -1) {
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180 // TODO: error handling
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181 fprintf(stderr, "%s\n", "Error: Cannot read from socket");
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182 return NULL;
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183 }
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184 buf->cursize += r;
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185 }
180
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186 if(!http_parser_validate(parser)) {
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187 log_ereport(LOG_FAILURE, "http_parser_validate failed");
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188 // TODO: send error 400 bad request
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189 return NULL;
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190 }
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191
1
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192 // process request
159
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193 r = handle_request(&request, NULL, NULL); // TODO: use correct thread pool
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194
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195 // TODO: free, see evt_request_finish
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196
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197 return NULL;
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198 }
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199
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200 void basic_keep_alive(SessionHandler *handler, Connection *conn) {
135
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201 connection_destroy(conn);
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202 }
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203
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204
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205 /* ----- event session handler ----- */
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206
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207 SessionHandler* create_event_session_handler() {
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208 EventSessionHandler *handler = malloc(sizeof(EventSessionHandler));
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209 handler->eventhandler = get_default_event_handler();
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210 handler->sh.enqueue_connection = evt_enq_conn;
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211 handler->sh.keep_alive = evt_keep_alive;
191
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212 handler->sh.create_iostream = create_connection_iostream;
35
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213 return (SessionHandler*)handler;
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214 }
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215
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216 void evt_enq_conn(SessionHandler *handler, Connection *conn) {
46
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217 HTTPRequest *request = malloc(sizeof(HTTPRequest));
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218 http_request_init(request);
35
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219 request->connection = conn;
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220 conn->session_handler = handler;
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221
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222 // set socket non blocking
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223 int flags;
188
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224 if ((flags = fcntl(conn->fd, F_GETFL, 0)) == -1) {
35
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225 flags = 0;
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226 }
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227 if (fcntl(conn->fd, F_SETFL, flags | O_NONBLOCK) != 0) {
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228 perror("Error: start_event_session: fcntl");
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229 // TODO: error
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230 }
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231
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232 // TODO: remove code redundancy (basic_run_session)
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233
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234 // read request
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235 netbuf *buf = malloc(sizeof(netbuf));
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236 buf->rdtimeout = 120;
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237 buf->pos = 0;
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238 buf->cursize = 0;
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239 buf->maxsize = 2048;
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240 buf->sd = &conn->fd;
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241 buf->inbuf = malloc(2048);
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242 buf->errmsg = NULL;
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243
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244 request->netbuf = buf;
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245
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246 HttpParser *parser = http_parser_new(request);
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247
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248 EventHttpIO *io = malloc(sizeof(EventHttpIO));
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249 if(io == NULL) {
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250 // TODO: error handling
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251 }
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252 io->request = request;
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253 io->parser = parser;
152
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diff changeset
254 io->error = 0;
35
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255
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256 /*
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257 * to start the request handling, we begin with a poll on the socket,
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258 *
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259 * evt_enq_conn() --> event handler --> handle_request()
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260 */
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261
159
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262 Event *event = malloc(sizeof(Event));
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263 ZERO(event, sizeof(Event));
194
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diff changeset
264 event->fn = conn->ssl && !conn->ssl_accepted ? evt_request_ssl_accept : evt_request_input;
46
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diff changeset
265 event->finish = evt_request_finish;
35
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266 event->cookie = io;
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267
159
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268 EventHandler *ev = ev_instance(((EventSessionHandler*)handler)->eventhandler);
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diff changeset
269
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270 if(ev_pollin(ev, conn->fd, event) != 0) {
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diff changeset
271 // TODO: ev_pollin should log, intercept some errors here
133
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272 log_ereport(LOG_FAILURE, "Cannot enqueue connection");
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273 connection_destroy(conn);
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274 // TODO: free stuff
35
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275 }
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276 }
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277
188
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diff changeset
278 int evt_request_ssl_accept(EventHandler *handler, Event *event) {
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279 EventHttpIO *io = event->cookie;
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280 Connection *conn = io->request->connection;
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281
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282 int ret = SSL_accept(conn->ssl);
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283 if(ret <= 0) {
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diff changeset
284 int error = SSL_get_error(conn->ssl, ret);
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diff changeset
285 char *errstr;
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286 switch(error) {
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287 default: errstr = "unknown"; break;
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diff changeset
288 case SSL_ERROR_WANT_READ: {
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289 event->events = EVENT_POLLIN;
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290 return 1;
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291 }
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diff changeset
292 case SSL_ERROR_WANT_WRITE: {
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diff changeset
293 event->events = EVENT_POLLOUT;
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294 return 1;
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295 }
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diff changeset
296 case SSL_ERROR_ZERO_RETURN: errstr = "SSL_ERROR_ZERO_RETURN"; break;
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297 case SSL_ERROR_WANT_CONNECT: errstr = "SSL_ERROR_WANT_CONNECT"; break;
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298 case SSL_ERROR_WANT_ACCEPT: errstr = "SSL_ERROR_WANT_ACCEPT"; break;
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diff changeset
299 case SSL_ERROR_WANT_X509_LOOKUP: errstr = "SSL_ERROR_WANT_X509_LOOKUP"; break;
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diff changeset
300 case SSL_ERROR_SYSCALL: errstr = "SSL_ERROR_SYSCALL"; break;
197
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301 case SSL_ERROR_SSL: errstr = "SSL_ERROR_SSL"; break;
188
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302 }
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303 log_ereport(LOG_VERBOSE, "SSL accept error[%d]: %s", error, errstr);
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304 event->finish = evt_request_error;
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305 io->error = 1;
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306 return 0;
188
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307 }
194
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308 conn->ssl_accepted = WS_TRUE;
188
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309
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310 // SSL_accept successful, start request input now
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311 event->fn = evt_request_input;
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312 return evt_request_input(handler, event);
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313 }
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314
159
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diff changeset
315 int evt_request_input(EventHandler *handler, Event *event) {
35
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316 EventHttpIO *io = event->cookie;
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317 HttpParser *parser = io->parser;
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318 HTTPRequest *request = io->request;
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319 Connection *conn = io->request->connection;
35
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320 netbuf *buf = request->netbuf;
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321
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322 int state;
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323 int r;
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324 r = conn->read(
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325 conn,
35
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326 buf->inbuf + buf->pos,
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327 buf->maxsize - buf->pos);
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328 if(r <= 0) {
133
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329 if(conn->ssl) {
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330 // SSL specific error handling
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331 switch(conn->ssl_error) {
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332 case SSL_ERROR_WANT_READ: {
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333 event->events = EVENT_POLLIN;
133
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334 return 1;
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335 }
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336 case SSL_ERROR_WANT_WRITE: {
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337 event->events = EVENT_POLLOUT;
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338 return 1;
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339 }
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340 }
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341 }
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342
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343 event->finish = evt_request_error;
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344 io->error = 1;
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345 return 0;
35
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346 }
48
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347 //fwrite(buf->inbuf + buf->pos, 1, r, stdout);
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348 //printf("\n");
35
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349
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350 buf->cursize += r;
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351 state = http_parser_process(parser);
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352 if(state == 2) {
47
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353 // parse error
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354 fatal_error(request, 400);
354
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355 log_ereport(LOG_VERBOSE, "http parser: bad request");
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356 //printf("\n\n%.*s\n\n", parser->request->netbuf->cursize, parser->request->netbuf->inbuf);
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357 //fflush(stdout);
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358 event->finish = evt_request_error;
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359 io->error = 2;
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360 return 0;
35
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361 } else if(state == 1) {
41
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362 /*
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363 * we need more data -> return 1 to tell the event handler to
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364 * continue polling
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365 */
159
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366 event->events = EVENT_POLLIN;
41
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367 return 1;
35
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368 }
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369
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370 // we are done with reading
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371
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372 // set socket blocking
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373 int flags;
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374 if (-1 == (flags = fcntl(request->connection->fd, F_GETFL, 0))) {
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375 flags = 0;
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376 }
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377 if (fcntl(request->connection->fd, F_SETFL, flags & ~O_NONBLOCK) != 0) {
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378 // just close the connection if fcntl fails
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379 event->finish = evt_request_error;
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380 io->error = 3;
47
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381 return 0;
180
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382 }
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diff changeset
383
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diff changeset
384 if(!http_parser_validate(parser)) {
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385 log_ereport(LOG_FAILURE, "http_parser_validate failed");
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386 // TODO: send error 400 bad request
181
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387 event->finish = evt_request_error;
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388 return 0;
35
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389 }
180
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diff changeset
390
46
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diff changeset
391 /*
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diff changeset
392 * process request
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393 *
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394 * We return 0 to finish request input. The event handler than stops
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395 * polling and executes event->finish (evt_request_input_finish)
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396 */
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diff changeset
397 return 0;
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diff changeset
398 }
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diff changeset
399
159
9ba9f8befa80 makes EventHandler public
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diff changeset
400 int evt_request_finish(EventHandler *h, Event *event) {
46
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diff changeset
401 EventHttpIO *io = event->cookie;
636e05eb48f6 cleaning up resources after requests
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diff changeset
402 HttpParser *parser = io->parser;
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diff changeset
403 HTTPRequest *request = io->request;
67
50505dc3f8a6 dynamic thread pool
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parents: 60
diff changeset
404
159
9ba9f8befa80 makes EventHandler public
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diff changeset
405 int r = handle_request(request, NULL, h);
47
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diff changeset
406 if(r != 0) {
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diff changeset
407 // TODO: error message
169
76c96ee18221 check close return value
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diff changeset
408 connection_destroy(request->connection);
47
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diff changeset
409 }
41
bb7a1f5a8b48 added Linux support
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parents: 37
diff changeset
410
46
636e05eb48f6 cleaning up resources after requests
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diff changeset
411 /*
636e05eb48f6 cleaning up resources after requests
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diff changeset
412 * handle_request can return before the request is finished, but it copies
636e05eb48f6 cleaning up resources after requests
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diff changeset
413 * all important data. We can free request, parser and event
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diff changeset
414 *
636e05eb48f6 cleaning up resources after requests
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diff changeset
415 * don't free request->netbuf and request->connection
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diff changeset
416 */
114
c3a0f1275d71 fixed keep alive bug
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diff changeset
417 http_request_cleanup(request);
46
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diff changeset
418 http_parser_free(parser);
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diff changeset
419
636e05eb48f6 cleaning up resources after requests
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diff changeset
420 free(io);
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diff changeset
421 free(event);
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diff changeset
422
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diff changeset
423 return 0;
35
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diff changeset
424 }
47
ce9790523346 server can change uid
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diff changeset
425
159
9ba9f8befa80 makes EventHandler public
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diff changeset
426 int evt_request_error(EventHandler *h, Event *event) {
47
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diff changeset
427 EventHttpIO *io = event->cookie;
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diff changeset
428 HttpParser *parser = io->parser;
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diff changeset
429 HTTPRequest *request = io->request;
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diff changeset
430
152
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diff changeset
431 if(event->error) {
195
d367b687bc74 fixes double close
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diff changeset
432 log_ereport(LOG_VERBOSE, "sessionhandler http io error: %d fd: %d", io->error, request->connection->fd);
152
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diff changeset
433 }
8b85c5face66 improves sessionhandler logging
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parents: 142
diff changeset
434
114
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parents: 106
diff changeset
435 free(request->netbuf->inbuf);
c3a0f1275d71 fixed keep alive bug
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parents: 106
diff changeset
436 free(request->netbuf);
47
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diff changeset
437
114
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diff changeset
438 cfg_unref(request->connection->listener->cfg);
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diff changeset
439 connection_destroy(request->connection);
47
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diff changeset
440
114
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diff changeset
441 http_request_cleanup(request);
47
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diff changeset
442 http_parser_free(parser);
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diff changeset
443
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diff changeset
444 free(io);
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445 free(event);
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diff changeset
446
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diff changeset
447 return 0;
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diff changeset
448 }
78
3578977d29a3 added keep-alive support
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diff changeset
449
3578977d29a3 added keep-alive support
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diff changeset
450 void evt_keep_alive(SessionHandler *handler, Connection *conn) {
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diff changeset
451 // TODO: set timeout
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parents: 67
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452
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Olaf Wintermann <olaf.wintermann@gmail.com>
parents: 67
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453 /* TODO:
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Olaf Wintermann <olaf.wintermann@gmail.com>
parents: 67
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454 * Don't just re-enqueue the connection
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Olaf Wintermann <olaf.wintermann@gmail.com>
parents: 67
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455 * create a evt_req_init function which does most of the evt_enq_conn stuff
3578977d29a3 added keep-alive support
Olaf Wintermann <olaf.wintermann@gmail.com>
parents: 67
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456 * but don't poll.
3578977d29a3 added keep-alive support
Olaf Wintermann <olaf.wintermann@gmail.com>
parents: 67
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457 * evt_keep_alive should poll and if an event occurs:
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Olaf Wintermann <olaf.wintermann@gmail.com>
parents: 67
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458 * evt_req_init
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Olaf Wintermann <olaf.wintermann@gmail.com>
parents: 67
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459 * evt_request_input
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Olaf Wintermann <olaf.wintermann@gmail.com>
parents: 67
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460 * evt_enq_conn should do:
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Olaf Wintermann <olaf.wintermann@gmail.com>
parents: 67
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461 * evt_req_init
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Olaf Wintermann <olaf.wintermann@gmail.com>
parents: 67
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462 * ev_pollin
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Olaf Wintermann <olaf.wintermann@gmail.com>
parents: 67
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463 */
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Olaf Wintermann <olaf.wintermann@gmail.com>
parents: 67
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464 evt_enq_conn(handler, conn);
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Olaf Wintermann <olaf.wintermann@gmail.com>
parents: 67
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465 }

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