1 | /* |
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2 | * Copyright (C) 2020 Soleta Networks <info@soleta.eu> |
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3 | * |
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4 | * This program is free software: you can redistribute it and/or modify it under |
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5 | * the terms of the GNU Affero General Public License as published by the |
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6 | * Free Software Foundation, version 3. |
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7 | */ |
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8 | |
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9 | #include "ogAdmServer.h" |
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10 | #include "dbi.h" |
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11 | #include "utils.h" |
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12 | #include "list.h" |
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13 | #include "rest.h" |
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14 | #include "client.h" |
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15 | #include "json.h" |
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16 | #include "schedule.h" |
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17 | #include <syslog.h> |
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18 | #include <sys/ioctl.h> |
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19 | #include <ifaddrs.h> |
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20 | #include <sys/types.h> |
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21 | #include <sys/stat.h> |
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22 | #include <fcntl.h> |
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23 | #include <jansson.h> |
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24 | #include <time.h> |
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25 | |
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26 | static void og_client_release(struct ev_loop *loop, struct og_client *cli) |
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27 | { |
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28 | list_del(&cli->list); |
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29 | ev_io_stop(loop, &cli->io); |
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30 | close(cli->io.fd); |
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31 | free(cli); |
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32 | } |
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33 | |
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34 | static void og_client_reset_state(struct og_client *cli) |
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35 | { |
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36 | cli->state = OG_CLIENT_RECEIVING_HEADER; |
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37 | cli->buf_len = 0; |
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38 | } |
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39 | |
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40 | static int og_client_payload_too_large(struct og_client *cli) |
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41 | { |
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42 | char buf[] = "HTTP/1.1 413 Payload Too Large\r\n" |
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43 | "Content-Length: 0\r\n\r\n"; |
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44 | |
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45 | send(og_client_socket(cli), buf, strlen(buf), 0); |
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46 | |
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47 | return -1; |
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48 | } |
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49 | |
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50 | static int og_client_state_recv_hdr_rest(struct og_client *cli) |
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51 | { |
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52 | char *ptr; |
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53 | |
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54 | ptr = strstr(cli->buf, "\r\n\r\n"); |
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55 | if (!ptr) |
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56 | return 0; |
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57 | |
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58 | cli->msg_len = ptr - cli->buf + 4; |
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59 | |
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60 | ptr = strstr(cli->buf, "Content-Length: "); |
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61 | if (ptr) { |
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62 | sscanf(ptr, "Content-Length: %i[^\r\n]", &cli->content_length); |
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63 | if (cli->content_length < 0) |
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64 | return -1; |
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65 | cli->msg_len += cli->content_length; |
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66 | } |
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67 | |
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68 | ptr = strstr(cli->buf, "Authorization: "); |
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69 | if (ptr) |
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70 | sscanf(ptr, "Authorization: %63[^\r\n]", cli->auth_token); |
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71 | |
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72 | return 1; |
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73 | } |
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74 | |
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75 | static int og_client_recv(struct og_client *cli, int events) |
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76 | { |
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77 | struct ev_io *io = &cli->io; |
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78 | int ret; |
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79 | |
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80 | if (events & EV_ERROR) { |
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81 | syslog(LOG_ERR, "unexpected error event from client %s:%hu\n", |
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82 | inet_ntoa(cli->addr.sin_addr), |
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83 | ntohs(cli->addr.sin_port)); |
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84 | return 0; |
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85 | } |
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86 | |
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87 | ret = recv(io->fd, cli->buf + cli->buf_len, |
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88 | sizeof(cli->buf) - cli->buf_len, 0); |
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89 | if (ret <= 0) { |
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90 | if (ret < 0) { |
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91 | syslog(LOG_ERR, "error reading from client %s:%hu (%s)\n", |
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92 | inet_ntoa(cli->addr.sin_addr), ntohs(cli->addr.sin_port), |
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93 | strerror(errno)); |
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94 | } |
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95 | return ret; |
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96 | } |
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97 | |
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98 | return ret; |
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99 | } |
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100 | |
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101 | static void og_client_read_cb(struct ev_loop *loop, struct ev_io *io, int events) |
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102 | { |
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103 | struct og_client *cli; |
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104 | int ret; |
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105 | |
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106 | cli = container_of(io, struct og_client, io); |
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107 | |
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108 | ret = og_client_recv(cli, events); |
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109 | if (ret <= 0) |
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110 | goto close; |
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111 | |
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112 | if (cli->keepalive_idx >= 0) |
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113 | return; |
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114 | |
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115 | ev_timer_again(loop, &cli->timer); |
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116 | |
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117 | cli->buf_len += ret; |
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118 | if (cli->buf_len >= sizeof(cli->buf)) { |
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119 | syslog(LOG_ERR, "client request from %s:%hu is too long\n", |
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120 | inet_ntoa(cli->addr.sin_addr), ntohs(cli->addr.sin_port)); |
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121 | og_client_payload_too_large(cli); |
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122 | goto close; |
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123 | } |
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124 | |
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125 | switch (cli->state) { |
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126 | case OG_CLIENT_RECEIVING_HEADER: |
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127 | ret = og_client_state_recv_hdr_rest(cli); |
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128 | if (ret < 0) |
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129 | goto close; |
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130 | if (!ret) |
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131 | return; |
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132 | |
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133 | cli->state = OG_CLIENT_RECEIVING_PAYLOAD; |
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134 | /* Fall through. */ |
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135 | case OG_CLIENT_RECEIVING_PAYLOAD: |
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136 | /* Still not enough data to process request. */ |
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137 | if (cli->buf_len < cli->msg_len) |
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138 | return; |
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139 | |
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140 | cli->state = OG_CLIENT_PROCESSING_REQUEST; |
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141 | /* fall through. */ |
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142 | case OG_CLIENT_PROCESSING_REQUEST: |
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143 | ret = og_client_state_process_payload_rest(cli); |
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144 | if (ret < 0) { |
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145 | syslog(LOG_ERR, "Failed to process HTTP request from %s:%hu\n", |
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146 | inet_ntoa(cli->addr.sin_addr), |
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147 | ntohs(cli->addr.sin_port)); |
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148 | } |
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149 | if (ret < 0) |
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150 | goto close; |
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151 | |
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152 | if (cli->keepalive_idx < 0) { |
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153 | goto close; |
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154 | } else { |
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155 | og_client_reset_state(cli); |
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156 | } |
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157 | break; |
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158 | default: |
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159 | syslog(LOG_ERR, "unknown state, critical internal error\n"); |
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160 | goto close; |
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161 | } |
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162 | return; |
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163 | close: |
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164 | ev_timer_stop(loop, &cli->timer); |
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165 | og_client_release(loop, cli); |
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166 | } |
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167 | |
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168 | enum og_agent_state { |
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169 | OG_AGENT_RECEIVING_HEADER = 0, |
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170 | OG_AGENT_RECEIVING_PAYLOAD, |
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171 | OG_AGENT_PROCESSING_RESPONSE, |
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172 | }; |
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173 | |
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174 | static int og_agent_state_recv_hdr_rest(struct og_client *cli) |
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175 | { |
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176 | char *ptr; |
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177 | |
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178 | ptr = strstr(cli->buf, "\r\n\r\n"); |
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179 | if (!ptr) |
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180 | return 0; |
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181 | |
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182 | cli->msg_len = ptr - cli->buf + 4; |
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183 | |
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184 | ptr = strstr(cli->buf, "Content-Length: "); |
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185 | if (ptr) { |
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186 | sscanf(ptr, "Content-Length: %i[^\r\n]", &cli->content_length); |
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187 | if (cli->content_length < 0) |
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188 | return -1; |
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189 | cli->msg_len += cli->content_length; |
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190 | } |
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191 | |
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192 | return 1; |
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193 | } |
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194 | |
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195 | static void og_agent_reset_state(struct og_client *cli) |
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196 | { |
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197 | cli->state = OG_AGENT_RECEIVING_HEADER; |
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198 | cli->buf_len = 0; |
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199 | cli->content_length = 0; |
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200 | memset(cli->buf, 0, sizeof(cli->buf)); |
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201 | } |
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202 | |
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203 | static void og_agent_deliver_pending_cmd(struct og_client *cli) |
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204 | { |
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205 | const struct og_cmd *cmd; |
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206 | |
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207 | cmd = og_cmd_find(inet_ntoa(cli->addr.sin_addr)); |
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208 | if (!cmd) |
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209 | return; |
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210 | |
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211 | og_send_request(cmd->method, cmd->type, &cmd->params, cmd->json); |
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212 | cli->last_cmd_id = cmd->id; |
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213 | |
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214 | og_cmd_free(cmd); |
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215 | } |
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216 | |
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217 | static void og_agent_read_cb(struct ev_loop *loop, struct ev_io *io, int events) |
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218 | { |
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219 | struct og_client *cli; |
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220 | int ret; |
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221 | |
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222 | cli = container_of(io, struct og_client, io); |
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223 | |
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224 | ret = og_client_recv(cli, events); |
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225 | if (ret <= 0) |
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226 | goto close; |
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227 | |
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228 | ev_timer_again(loop, &cli->timer); |
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229 | |
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230 | cli->buf_len += ret; |
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231 | if (cli->buf_len >= sizeof(cli->buf)) { |
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232 | syslog(LOG_ERR, "client request from %s:%hu is too long\n", |
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233 | inet_ntoa(cli->addr.sin_addr), ntohs(cli->addr.sin_port)); |
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234 | goto close; |
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235 | } |
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236 | |
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237 | switch (cli->state) { |
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238 | case OG_AGENT_RECEIVING_HEADER: |
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239 | ret = og_agent_state_recv_hdr_rest(cli); |
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240 | if (ret < 0) |
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241 | goto close; |
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242 | if (!ret) |
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243 | return; |
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244 | |
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245 | cli->state = OG_AGENT_RECEIVING_PAYLOAD; |
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246 | /* Fall through. */ |
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247 | case OG_AGENT_RECEIVING_PAYLOAD: |
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248 | /* Still not enough data to process request. */ |
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249 | if (cli->buf_len < cli->msg_len) |
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250 | return; |
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251 | |
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252 | cli->state = OG_AGENT_PROCESSING_RESPONSE; |
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253 | /* fall through. */ |
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254 | case OG_AGENT_PROCESSING_RESPONSE: |
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255 | ret = og_agent_state_process_response(cli); |
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256 | if (ret < 0) { |
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257 | syslog(LOG_ERR, "Failed to process HTTP request from %s:%hu\n", |
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258 | inet_ntoa(cli->addr.sin_addr), |
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259 | ntohs(cli->addr.sin_port)); |
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260 | goto close; |
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261 | } else if (ret == 0) { |
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262 | og_agent_deliver_pending_cmd(cli); |
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263 | } |
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264 | |
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265 | og_agent_reset_state(cli); |
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266 | break; |
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267 | default: |
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268 | syslog(LOG_ERR, "unknown state, critical internal error\n"); |
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269 | goto close; |
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270 | } |
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271 | return; |
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272 | close: |
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273 | ev_timer_stop(loop, &cli->timer); |
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274 | og_client_release(loop, cli); |
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275 | } |
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276 | |
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277 | static void og_client_timer_cb(struct ev_loop *loop, ev_timer *timer, int events) |
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278 | { |
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279 | struct og_client *cli; |
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280 | |
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281 | cli = container_of(timer, struct og_client, timer); |
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282 | if (cli->keepalive_idx >= 0) { |
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283 | ev_timer_again(loop, &cli->timer); |
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284 | return; |
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285 | } |
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286 | syslog(LOG_ERR, "timeout request for client %s:%hu\n", |
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287 | inet_ntoa(cli->addr.sin_addr), ntohs(cli->addr.sin_port)); |
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288 | |
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289 | og_client_release(loop, cli); |
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290 | } |
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291 | |
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292 | static void og_agent_send_refresh(struct og_client *cli) |
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293 | { |
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294 | struct og_msg_params params; |
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295 | int err; |
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296 | |
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297 | params.ips_array[0] = inet_ntoa(cli->addr.sin_addr); |
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298 | params.ips_array_len = 1; |
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299 | |
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300 | err = og_send_request(OG_METHOD_GET, OG_CMD_REFRESH, ¶ms, NULL); |
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301 | if (err < 0) { |
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302 | syslog(LOG_ERR, "Can't send refresh to: %s\n", |
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303 | params.ips_array[0]); |
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304 | } else { |
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305 | syslog(LOG_INFO, "Sent refresh to: %s\n", |
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306 | params.ips_array[0]); |
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307 | } |
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308 | } |
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309 | |
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310 | /* Shut down connection if there is no complete message after 10 seconds. */ |
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311 | #define OG_CLIENT_TIMEOUT 10 |
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312 | |
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313 | /* Agent client operation might take longer, shut down after 30 seconds. */ |
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314 | #define OG_AGENT_CLIENT_TIMEOUT 30 |
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315 | |
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316 | int socket_rest, socket_agent_rest; |
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317 | |
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318 | void og_server_accept_cb(struct ev_loop *loop, struct ev_io *io, int events) |
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319 | { |
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320 | struct sockaddr_in client_addr; |
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321 | socklen_t addrlen = sizeof(client_addr); |
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322 | struct og_client *cli; |
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323 | int client_sd; |
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324 | |
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325 | if (events & EV_ERROR) |
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326 | return; |
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327 | |
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328 | client_sd = accept(io->fd, (struct sockaddr *)&client_addr, &addrlen); |
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329 | if (client_sd < 0) { |
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330 | syslog(LOG_ERR, "cannot accept client connection\n"); |
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331 | return; |
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332 | } |
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333 | |
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334 | cli = (struct og_client *)calloc(1, sizeof(struct og_client)); |
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335 | if (!cli) { |
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336 | close(client_sd); |
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337 | return; |
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338 | } |
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339 | memcpy(&cli->addr, &client_addr, sizeof(client_addr)); |
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340 | if (io->fd == socket_agent_rest) |
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341 | cli->keepalive_idx = 0; |
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342 | else |
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343 | cli->keepalive_idx = -1; |
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344 | |
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345 | if (io->fd == socket_rest) |
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346 | cli->rest = true; |
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347 | else if (io->fd == socket_agent_rest) |
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348 | cli->agent = true; |
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349 | |
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350 | if (io->fd == socket_agent_rest) |
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351 | ev_io_init(&cli->io, og_agent_read_cb, client_sd, EV_READ); |
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352 | else |
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353 | ev_io_init(&cli->io, og_client_read_cb, client_sd, EV_READ); |
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354 | |
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355 | ev_io_start(loop, &cli->io); |
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356 | if (io->fd == socket_agent_rest) { |
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357 | ev_timer_init(&cli->timer, og_client_timer_cb, |
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358 | OG_AGENT_CLIENT_TIMEOUT, 0.); |
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359 | } else { |
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360 | ev_timer_init(&cli->timer, og_client_timer_cb, |
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361 | OG_CLIENT_TIMEOUT, 0.); |
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362 | } |
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363 | ev_timer_start(loop, &cli->timer); |
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364 | og_client_add(cli); |
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365 | |
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366 | if (io->fd == socket_agent_rest) { |
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367 | og_agent_send_refresh(cli); |
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368 | } |
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369 | } |
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370 | |
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371 | int og_socket_server_init(const char *port) |
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372 | { |
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373 | struct sockaddr_in local; |
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374 | int sd, on = 1; |
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375 | |
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376 | sd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); |
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377 | if (sd < 0) { |
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378 | syslog(LOG_ERR, "cannot create main socket\n"); |
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379 | return -1; |
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380 | } |
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381 | setsockopt(sd, SOL_SOCKET, SO_REUSEPORT, &on, sizeof(int)); |
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382 | |
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383 | local.sin_addr.s_addr = htonl(INADDR_ANY); |
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384 | local.sin_family = AF_INET; |
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385 | local.sin_port = htons(atoi(port)); |
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386 | |
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387 | if (bind(sd, (struct sockaddr *) &local, sizeof(local)) < 0) { |
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388 | close(sd); |
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389 | syslog(LOG_ERR, "cannot bind socket\n"); |
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390 | return -1; |
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391 | } |
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392 | |
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393 | listen(sd, 250); |
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394 | |
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395 | return sd; |
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396 | } |
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