src/server/daemon/main.c

Tue, 12 Sep 2023 18:08:11 +0200

author
Olaf Wintermann <olaf.wintermann@gmail.com>
date
Tue, 12 Sep 2023 18:08:11 +0200
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parent 444
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child 556
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permissions
-rw-r--r--

update uwproj

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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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29
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30 #include <stdio.h>
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31 #include <stdlib.h>
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32 #include <unistd.h>
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33 #include <signal.h>
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34 #include <errno.h>
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35 #include <pthread.h>
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36 #include <fcntl.h>
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37 #include <poll.h>
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38 #include <semaphore.h>
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39
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40 #include "../util/pool.h"
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41 #include "../public/nsapi.h"
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42 #include "../util/plist.h"
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43 #include "../util/date.h"
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44
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45 #include <cx/string.h>
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46
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47 #include "webserver.h"
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48 #include "log.h"
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49 #include "httprequest.h"
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50 #include "httplistener.h"
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51 #include "srvctrl.h"
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52
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53 #include "configmanager.h"
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54
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55 #define LOG_THREAD_STACK_SIZE 32768
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56 #define LOG_THREAD_MAX_POLL_FAILS 10
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57 #define LOG_THREAD_READ_BUF 2048
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58
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59 static int std_out[2];
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60 static int std_err[2];
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61 static WSBool is_daemon;
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62
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63 void test() {
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64 time_t t = time(NULL);
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65 pool_handle_t *pool = pool_create();
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66 cxmutstr date = date_format_http(t, pool);
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67 printf("%s\n", date.ptr);
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68 }
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69
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70
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71 WSBool main_is_daemon(void) {
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72 return is_daemon;
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73 }
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74
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75 /*
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76 * SIGUSR1: reload the configuration files
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77 */
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78 void sig_usr1_reload(int sig) {
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79 log_ereport(LOG_INFORM, "sig reload");
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80 (void)webserver_reconfig();
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81 signal(SIGUSR1, sig_usr1_reload);
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82 }
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83
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84 /*
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85 * SIGTERM: stop the server
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86 */
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87 void sig_term(int sig) {
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88 webserver_shutdown();
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89 //exit(EXIT_SUCCESS);
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90 }
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91
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92 static void set_pipe_nonblocking(int fd) {
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93 int flags = 0;
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94 flags = fcntl(fd, F_GETFL, 0);
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95 fcntl(fd, F_SETFL, flags & ~O_NONBLOCK);
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96 }
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97
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98 static char log_pipe_readbuf[LOG_THREAD_READ_BUF];
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99 static char log_pipe_stdout_buf[LOG_THREAD_READ_BUF];
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100 static char log_pipe_stderr_buf[LOG_THREAD_READ_BUF];
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101 static size_t log_pipe_stdout_tmp_pos = 0;
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102 static size_t log_pipe_stderr_tmp_pos = 0;
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103
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104 // pipe used for startup
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105 // after fork, the parent process waits, until the daemon is fully started
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106 // to get potential error and log messages
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107 static int daemon_start_pipe[2];
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108
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109 // used for sending log messages from the daemon process to the parent process
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110 // in the startup phase
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111 static int parent_log_pipe[2];
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112
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113 static LogDup startup_log;
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114
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115 static void finish_daemon_startup(int status) {
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116 if(status != 0) {
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117 log_ereport(LOG_FAILURE, "daemon startup failed");
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118 if(status > 127) {
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119 status = 127;
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120 }
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121 }
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122 char s = (char)status;
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123
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124 // notify parent process about startup status
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125 write(daemon_start_pipe[1], &s, 1);
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126 close(daemon_start_pipe[1]);
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127
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128 // remove logdup
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129 log_remove_logdup(&startup_log);
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130 close(parent_log_pipe[0]);
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131 close(parent_log_pipe[1]);
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132 }
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133
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134 static int log_pipe(const char *name, int fd, char *buf, size_t *pos) {
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135 ssize_t r = read(fd, log_pipe_readbuf, 2);
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136 if(r <= 0) {
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137 return r == 0 ? 0 : 1;
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138 }
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139
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140 char *tmp = buf;
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141 int tmplen = *pos;
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142
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143 int s = 0;
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144 for(int i=0;i<r;i++) {
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145 if(log_pipe_readbuf[i] == '\n') {
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146 if(tmplen + i-s > 0) {
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147 log_message(name, "%.*s%.*s", tmplen, tmp, i-s, log_pipe_readbuf + s);
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148 }
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149 tmplen = 0;
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150 *pos = 0;
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151 s = i+1;
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152 }
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153 }
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154
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155 int remaining = r - s;
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156 if(tmplen + remaining >= LOG_THREAD_READ_BUF) {
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157 log_message(name, "%.*s%.*s", tmplen, tmp, remaining, log_pipe_readbuf + s);
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158 *pos = 0;
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159 } else if(remaining > 0) {
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160 memcpy(buf + *pos, log_pipe_readbuf + s, remaining);
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161 *pos += remaining;
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162 }
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163
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164 return 0;
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165 }
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166
434
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167 void* log_pipe_thread(void *data) {
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168 set_pipe_nonblocking(std_out[0]);
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169 set_pipe_nonblocking(std_err[0]);
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170
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171 struct pollfd fds[2];
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172 fds[0].fd = std_out[0];
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173 fds[0].events = POLLIN;
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174 fds[1].fd = std_err[0];
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175 fds[1].events = POLLIN;
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176
434
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177 int poll_fails = 0;
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178 for(;;) {
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179 if(poll(fds, 1, 1000000) < 0) {
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180 if(errno == EINTR) {
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181 continue;
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182 }
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183 log_ereport(LOG_FAILURE, "log thread poll failed: %s", strerror(errno));
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184 if(poll_fails++ > LOG_THREAD_MAX_POLL_FAILS) {
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185 break;
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186 }
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187 }
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188
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189 // check stdout
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190 if(fds[0].revents & POLLIN) {
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191 if(log_pipe("stdout", fds[0].fd, log_pipe_stdout_buf, &log_pipe_stdout_tmp_pos)) {
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192 log_ereport(LOG_WARN, "log_pipe stdout failed");
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193 break;
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194 }
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195 }
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196
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197 // check stderr
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198 if(fds[1].revents & POLLIN) {
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199 if(log_pipe("stderr", fds[0].fd, log_pipe_stderr_buf, &log_pipe_stderr_tmp_pos)) {
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200 log_ereport(LOG_WARN, "log_pipe stderr failed");
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201 break;
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202 }
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203 }
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204 }
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205
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206 log_ereport(LOG_INFORM, "log thread end");
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207
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208 return NULL;
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209 }
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210
443
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211
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212 // read (blocking) 1 byte from daemon_start_pipe and return the value
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213 // this is used to wait in the parent process, until the daemon process
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214 // is started
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215 // the returning byte is used as the process return value
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216 static int main_daemon_startup_wait(void) {
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217 // receive log messages from daemon
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218 char buf[2048];
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219 ssize_t r;
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220 while((r = read(parent_log_pipe[0], buf, 2048)) > 0) {
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221 ssize_t pos = 0;
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222 while(r > 0) {
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223 ssize_t w = write(STDOUT_FILENO, buf+pos, r-pos);
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224 pos += w;
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225 r -= w;
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226 break;
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227 }
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228 }
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229 // log pipe closed, daemon_start_pipe should contain the status code now
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230
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231 char ret;
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232 if(read(daemon_start_pipe[0], &ret, 1) != 1) {
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233 return 255;
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234 }
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235 return ret;
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236 }
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237
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238 static void startup_log_write(void *cookie, char *msg, size_t length) {
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239 write(parent_log_pipe[1], msg, length);
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240 }
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241
1
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242 int main(int argc, char **argv) {
47
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243 //test();
68
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244
434
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245 // if the -c parameter is specified, we don't create a daemon
115
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246 is_daemon = 1;
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247 for(int i=0;i<argc;i++) {
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248 char *p = argv[i];
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249 if(p[0] == '-' && p[1] == 'c') {
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250 is_daemon = 0;
22
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251 break;
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252 }
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253 }
443
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254
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255 if(init_logging()) {
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256 fprintf(stderr, "OOM\n");
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257 return 1;
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258 }
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259
115
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260 if(is_daemon) {
443
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261 // initialize startup pipes
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262 if(pipe(daemon_start_pipe)) {
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263 perror("pipe");
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264 return EXIT_FAILURE;
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265 }
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266 if(pipe(parent_log_pipe)) {
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267 perror("pipe");
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268 return EXIT_FAILURE;
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269 }
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270
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271 log_ereport(LOG_INFORM, "start daemon");
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272
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273 // register parent process as LogDup to receive startup log messages
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274 // in the parent process, because stdout/stderr will be closed
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275 // after fork
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276 startup_log.write = startup_log_write;
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277 log_add_logdup(&startup_log);
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278
434
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279 // create daemon
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280 pid_t pid = fork();
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281 if(pid < 0) {
443
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282 perror("fork");
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283 return EXIT_FAILURE;
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284 } else if(pid > 0) {
443
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285 close(daemon_start_pipe[1]);
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286 close(parent_log_pipe[1]);
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287 return main_daemon_startup_wait();
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288 }
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289
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290 if(setsid() < 0) {
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diff changeset
291 fprintf(stderr, "setsid failed\n");
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292 return EXIT_FAILURE;
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293 }
443
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diff changeset
294
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295 // close read-end of pipe in the daemon process
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296 close(daemon_start_pipe[0]);
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297
434
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298 // stdio redirection
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299 // create pipes
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300 if(pipe(std_out) != 0) {
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301 perror("pipe");
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302 return EXIT_FAILURE;
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303 }
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304 if(pipe(std_err) != 0) {
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305 perror("pipe");
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306 return EXIT_FAILURE;
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307 }
434
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308
443
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309 for(int i=0;i<3;i++) {
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310 close(i);
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311 }
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312
434
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313 dup2(std_out[1], 1);
444
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314 dup2(std_err[1], 2);
443
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315 close(std_out[1]);
444
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316 close(std_err[1]);
434
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317
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318 // set log thread stack size
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319 pthread_attr_t tattr;
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320 pthread_attr_init(&tattr);
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321 pthread_attr_setstacksize(&tattr, LOG_THREAD_STACK_SIZE);
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322
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323 pthread_t tid;
434
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324 pthread_create(&tid, &tattr, log_pipe_thread, NULL);
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325 }
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326
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327 pool_init(NULL, NULL, NULL);
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328
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329 // add signal handler
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330 signal(SIGUSR1, sig_usr1_reload);
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331 signal(SIGTERM, sig_term);
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332 signal(SIGINT, sig_term);
125
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333
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334 struct sigaction act;
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335 ZERO(&act, sizeof(struct sigaction));
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336 act.sa_handler = SIG_IGN;
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337 sigaction(SIGPIPE, &act, NULL);
1
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338
434
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339 // start webserver
130
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340 log_ereport(LOG_INFORM, "startup");
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341
1
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342 int status;
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343 status = webserver_init();
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344 if(status != 0) {
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345 log_ereport(LOG_FAILURE, "cannot initialize server.");
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346 return EXIT_FAILURE;
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347 }
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348
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349 status = webserver_run();
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350 if(is_daemon) {
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351 finish_daemon_startup(status);
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352 }
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353 if(status != 0) {
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354 log_ereport(LOG_FAILURE, "cannot run server.");
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355 return EXIT_FAILURE;
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356 }
156
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357
158
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358 if(srvctrl_wait()) {
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359 return EXIT_FAILURE;
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360 }
1
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361
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362 return EXIT_SUCCESS;
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parents:
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363 }
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parents:
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364

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