src/server/daemon/webserver.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 115
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child 129
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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
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30 #ifdef __gnu_linux__
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31 #define _GNU_SOURCE
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32 #endif
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33
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34 #include <stdio.h>
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35 #include <stdlib.h>
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36 #include <dlfcn.h>
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37 #include <grp.h>
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38 #include <sys/types.h>
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39 #include <sys/stat.h>
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40
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41 #include <openssl/bio.h>
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42 #include <openssl/ssl.h>
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43 #include <openssl/err.h>
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44
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45 #include "../public/nsapi.h"
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46 #include "../public/auth.h"
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47 #include "../util/systhr.h"
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48 #include "../util/io.h"
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49 #include "../util/util.h"
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50
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51 #include "func.h"
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52 #include "config.h"
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53 #include "configmanager.h"
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54 #include "httplistener.h"
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55 #include "webserver.h"
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56 #include "log.h"
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57 #include "auth.h"
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58
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59 extern struct FuncStruct webserver_funcs[];
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60
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61 static RestartCallback *atrestart;
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62
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63 int webserver_init() {
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64 // init NSPR
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65 systhread_init("webserver");
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66
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67 // init ssl
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68 if(ws_init_ssl()) {
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69 return -1;
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70 }
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71
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72 // init NSAPI functions
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73 func_init();
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74 add_functions(webserver_funcs);
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75
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76 // load init.conf
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77 if(load_init_conf("config/init.conf")) {
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78 return -1;
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79 }
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81 // load server.conf
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82 init_configuration_manager();
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83 ServerConfiguration *cfg;
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84 if(cfgmgr_load_config(&cfg) != 0) {
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85 fprintf(stderr, "Cannot load configuration\n");
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86 return -1;
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87 }
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88
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89 // init caches
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90 auth_cache_init();
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91
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92 // create tmp dir and pid file
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93 char *mkdir_cmd = NULL;
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94 asprintf(&mkdir_cmd, "mkdir -p %s", cfg->tmp.ptr);
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95 system(mkdir_cmd);
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96 free(mkdir_cmd);
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97
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98 char *pid_file_path = NULL;
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99 asprintf(&pid_file_path, "%s/pid", cfg->tmp.ptr);
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100 FILE *pidfile = fopen(pid_file_path, "w");
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101 pid_t pid = getpid();
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102 fprintf(pidfile, "%d", pid);
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103 fclose(pidfile);
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104 free(pid_file_path);
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105
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106 // set global vars
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107 conf_global_vars_s *vars = conf_getglobals();
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108
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109 uid_t ws_uid = geteuid();
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110 setpwent();
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111 char *pwbuf = malloc(DEF_PWBUF);
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112 vars->Vuserpw = malloc(sizeof(struct passwd));
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113 if(cfg->user.ptr) {
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114 if(!util_getpwnam(cfg->user.ptr, vars->Vuserpw, pwbuf, DEF_PWBUF)) {
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115 log_ereport(
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116 LOG_MISCONFIG,
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117 "user %s does not exist!",
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118 cfg->user.ptr);
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119 free(vars->Vuserpw);
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120 vars->Vuserpw = NULL;
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121 }
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122 } else {
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123 if(!util_getpwuid(ws_uid, vars->Vuserpw, pwbuf, DEF_PWBUF)) {
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124 log_ereport(LOG_FAILURE, "webserver_init: cannot get passwd data");
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125 free(vars->Vuserpw);
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126 vars->Vuserpw = NULL;
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127 }
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128 }
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129 free(pwbuf);
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130 if(!vars->Vuserpw) {
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131 log_ereport(LOG_WARN, "globalvars->Vuserpw is null");
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132 }
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133
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134 if(cfg->user.ptr) {
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135 char *pwbuf = malloc(DEF_PWBUF);
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136 vars->Vuserpw = malloc(sizeof(struct passwd));
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137 // open user database
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138 //setpwent();
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139 if(!util_getpwnam(cfg->user.ptr, vars->Vuserpw, pwbuf, DEF_PWBUF)) {
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140 log_ereport(
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141 LOG_MISCONFIG,
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142 "user %s does not exist!",
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143 cfg->user.ptr);
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144 free(vars->Vuserpw);
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145 vars->Vuserpw = NULL;
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146 }
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147 free(pwbuf);
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148 //endpwent(); // TODO: close or not?
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149 }
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150
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151 // change uid
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152 if(vars->Vuserpw && ws_uid == 0) {
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153 // a webserver user is set and we are root
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154
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155 if(setgid(vars->Vuserpw->pw_gid) != 0) {
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156 log_ereport(
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157 LOG_FAILURE,
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158 "setgid(%d) failed",
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159 vars->Vuserpw->pw_gid);
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160 } else {
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161 // setgid was successful
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162 // we need to call initgroups to have all group permissions
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163 if(initgroups(vars->Vuserpw->pw_name, vars->Vuserpw->pw_gid)!=0) {
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164 log_ereport(LOG_FAILURE, "initgroups failed");
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165 }
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166 }
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167
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168 // change the uid
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169 if(setuid(vars->Vuserpw->pw_uid)) {
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170 log_ereport(
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171 LOG_FAILURE,
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172 "setuid(%d) failed",
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173 vars->Vuserpw->pw_uid);
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174 }
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175 } else if(vars->Vuserpw) {
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176 log_ereport(
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177 LOG_WARN,
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178 "server must be started as root to change uid");
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179 }
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180
1
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181 return 0;
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182 }
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183
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184 int webserver_run() {
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185 log_ereport(LOG_VERBOSE, "webserver_run");
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186
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187 // start all http listener
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188 if(start_all_listener() != 0) {
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189 fprintf(stderr, "Error: Cannot start http listener\n");
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190 }
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191
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192 log_ereport(LOG_INFORM, "webserver started");
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193
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194 return 0;
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195 }
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196
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197 void webserver_shutdown() {
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198 log_ereport(LOG_INFORM, "webserver shutdown");
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199
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200 // execute restart callbacks
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201 RestartCallback *re = atrestart;
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202 while(re) {
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203 re->func(re->data);
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204 re = re->next;
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205 }
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206 }
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207
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208 void webserver_atrestart(void (*fn)(void *), void *data) {
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209 RestartCallback *cb = malloc(sizeof(RestartCallback));
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210 cb->func = fn;
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211 cb->data = data;
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212 cb->next = NULL;
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213
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214 if(atrestart) {
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215 RestartCallback *elm = atrestart;
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216 while(elm) {
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217 if(!elm->next) {
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218 elm->next = cb;
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219 break;
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220 }
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221 elm = elm->next;
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222 }
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223 } else {
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224 atrestart = cb;
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225 }
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226 }
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227
68
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228 int nsapi_runtime_version() {
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229 return 303;
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230 }
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231
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232
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233 int ws_init_ssl() {
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234 // TODO: handle errors
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235 SSL_load_error_strings();
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236 SSL_library_init();
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237 OpenSSL_add_all_algorithms();
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238 return 0;
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239 }

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