src/server/daemon/sessionhandler.c

Wed, 10 Jan 2018 17:25:55 +0100

author
Olaf Wintermann <olaf.wintermann@gmail.com>
date
Wed, 10 Jan 2018 17:25:55 +0100
branch
aio
changeset 186
8041ac363f26
parent 159
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child 188
0e6a05c779e0
permissions
-rw-r--r--

fixes aio error handling

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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 close(conn->fd);
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59 }
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60
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61 int connection_ssl_read(Connection *conn, void *buf, int len) {
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62 int ret = SSL_read(conn->ssl, buf, len);
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63 if(ret <= 0) {
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64 conn->ssl_error = SSL_get_error(conn->ssl, ret);
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65 }
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66 return ret;
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67 }
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69 int connection_ssl_write(Connection *conn, const void *buf, int len) {
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70 int ret = SSL_write(conn->ssl, buf, len);
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71 if(ret <= 0) {
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72 conn->ssl_error = SSL_get_error(conn->ssl, ret);
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73 }
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74 return ret;
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75 }
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77 void connection_ssl_close(Connection *conn) {
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78 if(!conn->ssl_error) {
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79 int ret = SSL_shutdown(conn->ssl);
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80 if(ret != 1) {
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81 conn->ssl_error = SSL_get_error(conn->ssl, ret);
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82 log_ereport(LOG_VERBOSE, "SSL_shutdown failed: %d", conn->ssl_error);
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83 }
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84 }
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85 close(conn->fd);
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86 }
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87
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88 void connection_destroy(Connection *conn) {
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89 conn->close(conn);
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90 if(conn->ssl) {
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91 SSL_free(conn->ssl);
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92 }
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93 free(conn);
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94 }
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95
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96 SessionHandler* create_basic_session_handler() {
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97 BasicSessionHandler *handler = malloc(sizeof(BasicSessionHandler));
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98 handler->threadpool = threadpool_new(4, 8);
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99 handler->sh.enqueue_connection = basic_enq_conn;
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100 handler->sh.keep_alive = basic_keep_alive;
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101
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102 return (SessionHandler*)handler;
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103 }
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104
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105 void basic_enq_conn(SessionHandler *handler, Connection *conn) {
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106 BasicSessionHandler *sh = (BasicSessionHandler*)handler;
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107 conn->session_handler = handler;
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108 threadpool_run(sh->threadpool, basic_run_session, conn);
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109 }
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110
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111 void* basic_run_session(void *data) {
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112 Connection *conn = (Connection*)data;
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113
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114 HTTPRequest request;
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115 http_request_init(&request);
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116 request.connection = conn;
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117
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118 // read request
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119 netbuf *buf = malloc(sizeof(netbuf));
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120 buf->rdtimeout = 120;
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121 buf->pos = 0;
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122 buf->cursize = 0;
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123 buf->maxsize = 2048;
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124 buf->sd = &conn->fd;
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125 buf->inbuf = malloc(2048);
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126 buf->errmsg = NULL;
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127
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128 request.netbuf = buf;
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129
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130 HttpParser *parser = http_parser_new(&request);
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131 int state;
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132 int r;
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133 r = conn->read(conn, buf->inbuf + buf->pos, buf->maxsize - buf->pos);
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134 if(r <= 0) {
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135 // TODO: error handling
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136 fprintf(stderr, "%s\n", "Error: Cannot read from socket");
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137 return NULL;
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138 }
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139 buf->cursize += r;
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140 while((state = http_parser_process(parser)) != 0) {
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141 if(state == 2) {
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142 // TODO: error handling
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143 fprintf(stderr, "%s\n", "Error: Cannot parse http request");
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144 return NULL;
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145 }
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146 r = conn->read(conn, buf->inbuf + buf->pos, buf->maxsize - buf->pos);
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147 if(r == -1) {
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148 // TODO: error handling
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149 fprintf(stderr, "%s\n", "Error: Cannot read from socket");
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150 return NULL;
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151 }
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152 buf->cursize += r;
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153 }
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154
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155 // process request
159
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156 r = handle_request(&request, NULL, NULL); // TODO: use correct thread pool
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157
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158 // TODO: free, see evt_request_finish
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159
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160 return NULL;
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161 }
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162
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163 void basic_keep_alive(SessionHandler *handler, Connection *conn) {
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164 connection_destroy(conn);
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165 }
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166
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167
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168 /* ----- event session handler ----- */
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169
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170 SessionHandler* create_event_session_handler() {
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171 EventSessionHandler *handler = malloc(sizeof(EventSessionHandler));
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172 handler->eventhandler = get_default_event_handler();
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173 handler->sh.enqueue_connection = evt_enq_conn;
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174 handler->sh.keep_alive = evt_keep_alive;
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175 return (SessionHandler*)handler;
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176 }
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177
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178 void evt_enq_conn(SessionHandler *handler, Connection *conn) {
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179 HTTPRequest *request = malloc(sizeof(HTTPRequest));
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180 http_request_init(request);
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181 request->connection = conn;
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182 conn->session_handler = handler;
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183
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184 // set socket non blocking
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185 int flags;
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186 if (-1 == (flags = fcntl(conn->fd, F_GETFL, 0))) {
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187 flags = 0;
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188 }
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189 if (fcntl(conn->fd, F_SETFL, flags | O_NONBLOCK) != 0) {
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190 perror("Error: start_event_session: fcntl");
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191 // TODO: error
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192 }
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193
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194 // TODO: remove code redundancy (basic_run_session)
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195
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196 // read request
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197 netbuf *buf = malloc(sizeof(netbuf));
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198 buf->rdtimeout = 120;
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199 buf->pos = 0;
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200 buf->cursize = 0;
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201 buf->maxsize = 2048;
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202 buf->sd = &conn->fd;
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203 buf->inbuf = malloc(2048);
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204 buf->errmsg = NULL;
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205
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206 request->netbuf = buf;
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207
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208 HttpParser *parser = http_parser_new(request);
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209
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210 EventHttpIO *io = malloc(sizeof(EventHttpIO));
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211 if(io == NULL) {
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212 // TODO: error handling
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213 }
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214 io->request = request;
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215 io->parser = parser;
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216 io->error = 0;
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217
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218 /*
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219 * to start the request handling, we begin with a poll on the socket,
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220 *
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221 * evt_enq_conn() --> event handler --> handle_request()
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222 */
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223
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224 Event *event = malloc(sizeof(Event));
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225 ZERO(event, sizeof(Event));
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226 event->fn = evt_request_input;
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227 event->finish = evt_request_finish;
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228 event->cookie = io;
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229
159
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230 EventHandler *ev = ev_instance(((EventSessionHandler*)handler)->eventhandler);
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231
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232 if(ev_pollin(ev, conn->fd, event) != 0) {
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233 // TODO: ev_pollin should log, intercept some errors here
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234 log_ereport(LOG_FAILURE, "Cannot enqueue connection");
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235 connection_destroy(conn);
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236 // TODO: free stuff
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237 }
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238 }
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239
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240 int evt_request_input(EventHandler *handler, Event *event) {
35
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241 EventHttpIO *io = event->cookie;
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242 HttpParser *parser = io->parser;
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243 HTTPRequest *request = io->request;
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244 Connection *conn = io->request->connection;
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245 netbuf *buf = request->netbuf;
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246
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247 int state;
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248 int r;
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249 r = conn->read(
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250 conn,
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251 buf->inbuf + buf->pos,
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252 buf->maxsize - buf->pos);
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253 if(r <= 0) {
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254 if(conn->ssl) {
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255 // SSL specific error handling
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256 switch(conn->ssl_error) {
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257 case SSL_ERROR_WANT_READ: {
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258 event->events = EVENT_POLLIN;
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259 return 1;
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260 }
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261 case SSL_ERROR_WANT_WRITE: {
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262 event->events = EVENT_POLLOUT;
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263 return 1;
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264 }
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265 }
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266 }
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267
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268 event->finish = evt_request_error;
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269 io->error = 1;
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270 return 0;
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271 }
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272 //fwrite(buf->inbuf + buf->pos, 1, r, stdout);
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273 //printf("\n");
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274
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275 buf->cursize += r;
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276 state = http_parser_process(parser);
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277 if(state == 2) {
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278 // parse error
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279 fatal_error(request, 400);
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280 event->finish = evt_request_error;
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281 io->error = 2;
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282 return 0;
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283 } else if(state == 1) {
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284 /*
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285 * we need more data -> return 1 to tell the event handler to
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286 * continue polling
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287 */
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288 event->events = EVENT_POLLIN;
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289 return 1;
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290 }
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291
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292 // we are done with reading
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293
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294 // set socket blocking
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295 int flags;
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296 if (-1 == (flags = fcntl(request->connection->fd, F_GETFL, 0))) {
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297 flags = 0;
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298 }
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299 if (fcntl(request->connection->fd, F_SETFL, flags & ~O_NONBLOCK) != 0) {
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300 // just close the connection if fcntl fails
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301 event->finish = evt_request_error;
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302 io->error = 3;
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303 return 0;
35
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304 }
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305
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306 /*
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307 * process request
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308 *
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309 * We return 0 to finish request input. The event handler than stops
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310 * polling and executes event->finish (evt_request_input_finish)
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311 */
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312 return 0;
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313 }
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314
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315 int evt_request_finish(EventHandler *h, Event *event) {
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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
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320 int r = handle_request(request, NULL, h);
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321 if(r != 0) {
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322 // TODO: error message
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323 close(request->connection->fd);
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324 }
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325
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326 /*
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327 * handle_request can return before the request is finished, but it copies
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328 * all important data. We can free request, parser and event
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329 *
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330 * don't free request->netbuf and request->connection
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331 */
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332 http_request_cleanup(request);
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333 http_parser_free(parser);
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334
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335 free(io);
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336 free(event);
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337
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338 return 0;
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339 }
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340
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341 int evt_request_error(EventHandler *h, Event *event) {
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342 EventHttpIO *io = event->cookie;
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343 HttpParser *parser = io->parser;
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344 HTTPRequest *request = io->request;
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345
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346 if(event->error) {
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347 log_ereport(LOG_VERBOSE, "sessionhandler http io error: %d", io->error);
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348 }
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349
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350 free(request->netbuf->inbuf);
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351 free(request->netbuf);
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352
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353 cfg_unref(request->connection->listener->cfg);
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354 connection_destroy(request->connection);
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355
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356 http_request_cleanup(request);
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357 http_parser_free(parser);
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358
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359 free(io);
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360 free(event);
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361
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362 return 0;
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363 }
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364
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365 void evt_keep_alive(SessionHandler *handler, Connection *conn) {
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366 // TODO: set timeout
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367
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368 /* TODO:
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369 * Don't just re-enqueue the connection
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370 * create a evt_req_init function which does most of the evt_enq_conn stuff
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371 * but don't poll.
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372 * evt_keep_alive should poll and if an event occurs:
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373 * evt_req_init
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374 * evt_request_input
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375 * evt_enq_conn should do:
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376 * evt_req_init
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377 * ev_pollin
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378 */
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379 evt_enq_conn(handler, conn);
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380 }

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