1 | #include <stdio.h> |
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2 | #include <stdlib.h> |
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3 | #include <string.h> |
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4 | #include <sys/socket.h> |
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5 | #include <arpa/inet.h> |
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6 | #include <netdb.h> |
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7 | #include <unistd.h> |
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8 | #include <signal.h> |
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9 | #include <errno.h> |
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10 | #include <sys/wait.h> |
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11 | #include <sys/stat.h> |
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12 | #include <sys/types.h> |
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13 | #include <sys/mman.h> |
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14 | #include <stdarg.h> |
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15 | #include <syslog.h> |
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16 | #include <fcntl.h> |
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17 | #include <semaphore.h> |
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18 | #include <sys/ipc.h> |
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19 | #include <sys/shm.h> |
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20 | |
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21 | // Buffer size, in bytes, used for copying in the Cat() function. |
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22 | const size_t BUF_SIZE = 4096; |
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23 | |
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24 | // Global variables |
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25 | char g_program_name[100]; // Initialised from argv[0] in ParseArgs() |
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26 | |
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27 | // structs |
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28 | struct accept |
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29 | { |
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30 | int newfd; |
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31 | struct sockaddr_in sa; |
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32 | struct in_addr jabber_addr; |
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33 | unsigned short jabber_port; |
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34 | }; |
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35 | |
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36 | /*struct client |
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37 | { |
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38 | unsigned char * user; |
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39 | unsigned char * key; |
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40 | int jabber; |
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41 | int shmid; |
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42 | struct client * next, |
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43 | * previous; |
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44 | };*/ |
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45 | struct client |
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46 | { |
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47 | char * user; |
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48 | int client_fd; |
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49 | int jabber_fd; |
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50 | int keep_alive; |
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51 | int connectionType; // 0 = read/write; 1 = read; -1 = write; |
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52 | time_t last_action; |
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53 | struct client * next; |
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54 | struct client * previous; |
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55 | }; |
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56 | |
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57 | struct cat |
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58 | { |
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59 | int in_fd, |
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60 | out_fd; |
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61 | int jabber, |
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62 | keep_alive; |
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63 | struct client * client; |
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64 | int connectionType; |
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65 | }; |
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66 | |
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67 | struct client * clients = (struct client *)NULL; |
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68 | |
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69 | pthread_mutex_t mutexsum; |
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70 | |
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71 | // Typedef for a signal handler function. |
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72 | typedef void (* signal_handler_t) (int); |
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73 | |
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74 | // Prototypes for functions in this file. |
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75 | void ParseArgs (int, char **, struct in_addr *, unsigned short *, struct in_addr *, unsigned short *); |
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76 | void Initialise (void); |
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77 | void sig_child (int); |
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78 | int CreateServerSocket (struct in_addr, unsigned short); |
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79 | void Daemonise (void); |
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80 | void MainLoop (int, struct in_addr, unsigned short); |
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81 | struct accept * AcceptClientConnection (int); |
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82 | void VerifyClient(void *); |
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83 | struct client * Handshake(int); |
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84 | int ConnectToServer (struct in_addr, unsigned short); |
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85 | void Reading (void * info); |
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86 | void Writing (void * info); |
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87 | int NameToAddr (const char *, struct in_addr *); |
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88 | int NameToPort (const char *, unsigned short *, const char *); |
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89 | #ifdef __GNUC__ |
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90 | void quit (const char *, ...) __attribute__ ((format (printf, 1, 2))); |
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91 | void pbomb (const char *, ...) __attribute__ ((format (printf, 1, 2))); |
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92 | void hbomb (const char *, ...) __attribute__ ((format (printf, 1, 2))); |
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93 | #else |
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94 | void quit (const char *, ...); |
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95 | void pbomb (const char *, ...); |
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96 | void hbomb (const char *, ...); |
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97 | #endif |
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98 | void set_signal_handler (int, signal_handler_t); |
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99 | |
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100 | int main (int argc, char ** argv) |
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101 | { |
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102 | struct in_addr remote_addr, |
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103 | local_addr; |
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104 | unsigned short remote_port, |
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105 | local_port; |
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106 | int listen_fd; |
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107 | |
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108 | ParseArgs (argc, argv, &remote_addr, &remote_port, &local_addr, &local_port); |
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109 | |
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110 | Initialise (); |
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111 | |
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112 | // Create server socket before becoming a daemon so |
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113 | // there is still a chance to print an error message. |
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114 | listen_fd = CreateServerSocket (local_addr, local_port); |
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115 | if ( listen_fd < 0 ) |
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116 | pbomb ("Unable to create server socket"); |
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117 | |
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118 | //Daemonise (); |
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119 | |
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120 | MainLoop (listen_fd, remote_addr, remote_port); // never returns |
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121 | |
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122 | exit (EXIT_SUCCESS); |
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123 | } |
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124 | |
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125 | // ParseArgs() |
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126 | // Parse the command line arguments to extract the remote |
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127 | // and local adresses and port numbers, ra, rp, la & lp. |
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128 | // Exit the program gracefully upon error. |
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129 | void ParseArgs (int argc, char ** argv, struct in_addr * ra, unsigned short * rp, struct in_addr * la, unsigned short * lp) |
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130 | { |
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131 | // argv[0] = program name |
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132 | // argv[1] = remote_addr |
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133 | // argv[2] = remote_port |
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134 | // argv[3] = local_addr (optional) |
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135 | // argv[4] = local_port (optional) |
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136 | |
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137 | char * p = strrchr (argv[0], '/'); |
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138 | |
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139 | strncpy (g_program_name, (p == NULL) ? argv[0] : p + 1, sizeof (g_program_name) - 1); |
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140 | |
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141 | if ( (argc < 3) || (argc > 5) ) |
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142 | { |
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143 | fprintf (stderr, "usage: %s remote_addr remote_port [local_addr] [local_port]\n", argv[0]); |
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144 | exit (EXIT_FAILURE); |
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145 | } |
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146 | |
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147 | if ( NameToAddr (argv[1], ra) ) |
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148 | hbomb ("Unable to resolve \"%s\" to an ip address", argv[1]); |
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149 | |
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150 | if ( NameToPort (argv[2], rp, "tcp") ) |
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151 | quit ("Unable to resolve \"%s\" to a port number", argv[2]); |
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152 | |
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153 | if ( argc < 4 ) |
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154 | la->s_addr = htonl (INADDR_ANY); |
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155 | else |
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156 | if ( NameToAddr (argv[3], la) ) |
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157 | hbomb ("Unable to resolve \"%s\" to an ip address", argv[3]); |
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158 | |
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159 | if ( argc < 5 ) |
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160 | memcpy (lp, rp, sizeof (*lp)); |
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161 | else |
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162 | if ( NameToPort (argv[4], lp, "tcp") ) |
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163 | quit ("Unable to resolve \"%s\" to a port number", argv[4]); |
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164 | } |
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165 | |
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166 | // Initialise() |
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167 | // Setup syslog, signal handlers, and other intialisation. |
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168 | void Initialise (void) |
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169 | { |
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170 | openlog (g_program_name, LOG_PID, LOG_USER); |
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171 | syslog (LOG_INFO, "%s started", g_program_name); |
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172 | |
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173 | chdir ("/"); // Change working directory to the root. |
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174 | |
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175 | umask (0); // Clear our file mode creation mask |
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176 | |
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177 | //set_signal_handler (SIGCHLD, sig_child); |
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178 | |
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179 | //signal (SIGPIPE, SIG_IGN); |
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180 | } |
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181 | |
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182 | // sig_child() |
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183 | // Handles SIGCHLD from exiting child processes. |
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184 | void sig_child (int signo) |
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185 | { |
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186 | pid_t pid; |
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187 | |
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188 | (void) signo; // suppress compiler warning |
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189 | |
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190 | for ( ; ; ) |
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191 | { |
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192 | write(1, "SIG\n", sizeof("SIG\n")); |
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193 | pid = waitpid (WAIT_ANY, NULL, WNOHANG); |
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194 | |
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195 | if ( pid > 0 ) |
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196 | syslog (LOG_INFO, "Caught SIGCHLD from pid %d", pid); |
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197 | else |
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198 | break; |
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199 | } |
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200 | write(1, "SIG...\n", sizeof("SIG...\n")); |
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201 | |
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202 | if ( (pid < 0) && (errno != ECHILD) ) |
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203 | syslog (LOG_ERR, "waitpid(): %m"), exit (EXIT_FAILURE); |
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204 | |
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205 | return; |
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206 | } |
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207 | |
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208 | // CreateServerSocket() |
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209 | // Create a socket, bind it to the specified address |
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210 | // and port, and set it to listen for client connections. |
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211 | // Returns < 0 on failure to bind, bombs on error otherwise, |
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212 | // returns the fd of the new socket on success. |
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213 | int CreateServerSocket (struct in_addr addr, unsigned short port) |
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214 | { |
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215 | int err, |
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216 | fd; |
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217 | const int on = 1; |
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218 | struct sockaddr_in sa; |
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219 | |
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220 | // Create a socket and get its descriptor. |
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221 | fd = socket (AF_INET, SOCK_STREAM, 0); |
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222 | if ( fd < 0 ) |
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223 | syslog (LOG_ERR, "socket(): %m"), exit (EXIT_FAILURE); |
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224 | |
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225 | // Set SO_REUSEADDR socket option |
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226 | if ( setsockopt (fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof (on)) < 0 ) |
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227 | syslog (LOG_ERR, "setsockopt(fd%d, SO_REUSEADDR): %m", fd); |
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228 | |
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229 | // Load a sa structure with the specified address and port |
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230 | sa.sin_family = AF_INET; |
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231 | sa.sin_port = htons (port); |
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232 | //sa.sin_addr = addr; |
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233 | sa.sin_addr.s_addr = htonl(INADDR_ANY); |
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234 | memset (sa.sin_zero, 0, sizeof (sa.sin_zero)); |
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235 | |
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236 | // Bind our socket to the address and port specified |
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237 | err = bind (fd, (struct sockaddr *) &sa, sizeof (sa)); |
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238 | if ( err < 0 ) |
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239 | { |
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240 | syslog (LOG_ERR, "bind(): %m"); |
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241 | return err; |
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242 | } |
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243 | |
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244 | // Tell socket to listen and queue up to 5 incoming connections. |
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245 | if ( listen (fd, 5) < 0 ) |
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246 | syslog (LOG_ERR, "listen(): %m"), exit (EXIT_FAILURE); |
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247 | |
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248 | return fd; |
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249 | } |
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250 | |
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251 | // Daemonise() |
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252 | // Put the program in the background, set PPID=1, create a |
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253 | // new session and process group, without a controlling tty. |
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254 | void Daemonise (void) |
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255 | { |
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256 | pid_t pid; |
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257 | |
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258 | // Close stdin, stdout & stderr |
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259 | // @TODO: |
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260 | // open /dev/null and dup the fd to stdin, stdout & stderr |
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261 | // close(STDIN_FILENO); |
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262 | // close(STDOUT_FILENO); |
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263 | // close(STDERR_FILENO); |
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264 | |
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265 | syslog (LOG_INFO, "%s daemonising", g_program_name); |
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266 | |
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267 | // Fork the process to put it in the background. |
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268 | |
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269 | pid = fork (); |
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270 | if ( pid == -1 ) |
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271 | syslog (LOG_ERR, "fork(): %m"), exit (EXIT_FAILURE); |
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272 | |
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273 | // parent terminates here, so shell thinks the command is done. |
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274 | if ( pid ) |
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275 | exit (0); |
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276 | |
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277 | syslog (LOG_INFO, "%s in background", g_program_name); |
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278 | |
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279 | // 1st child continues to run in the background with PPID=1 |
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280 | |
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281 | // Become leader of a new session and a new process group, |
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282 | // with no controlling tty. |
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283 | setsid (); |
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284 | |
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285 | // Fork again to guarantee the process will |
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286 | // not be able to aquire a controlling tty. |
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287 | |
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288 | // signal (SIGHUP, SIG_IGN); |
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289 | // required according to Stevens' UNP2 p333 |
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290 | |
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291 | pid = fork (); |
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292 | if (pid == -1) |
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293 | syslog (LOG_ERR, "fork(): %m"), exit (EXIT_FAILURE); |
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294 | |
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295 | if ( pid ) // 1st child terminates |
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296 | exit (0); |
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297 | |
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298 | // 2nd child continues, no longer a session or group leader |
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299 | |
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300 | syslog (LOG_INFO, "%s daemonised", g_program_name); |
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301 | } |
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302 | |
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303 | // MainLoop() |
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304 | // Classic concurrent server model. |
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305 | // Wait for a client to connect, fork a child process |
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306 | // to do the business with the client, parent process |
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307 | // continues to wait for the next connection. |
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308 | // This function does not return. |
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309 | void MainLoop (int listen_fd, struct in_addr rem_addr, unsigned short rem_port) |
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310 | { |
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311 | struct accept * accept; |
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312 | pthread_t accept_thread, |
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313 | clear_list_thread; |
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314 | |
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315 | pthread_mutex_init(&mutexsum, NULL); |
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316 | |
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317 | //pthread_create(&clear_list_thread, NULL, (void *) &ClearList, (void *)NULL ); |
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318 | |
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319 | for ( ; ; ) |
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320 | { |
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321 | accept = AcceptClientConnection (listen_fd); |
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322 | accept->jabber_addr = rem_addr; |
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323 | accept->jabber_port = rem_port; |
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324 | |
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325 | pthread_create(&accept_thread, NULL, (void *) &VerifyClient, (void *) accept); |
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326 | } |
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327 | pthread_mutex_destroy(&mutexsum); |
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328 | pthread_exit(NULL); |
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329 | } |
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330 | |
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331 | // AcceptClientConnection() |
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332 | // waits for a tcp connect to the socket listen_fd, which |
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333 | // must already be bound and set to listen on a local port. |
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334 | // Bombs on error, returns the fd of the new socket on success. |
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335 | //int AcceptClientConnection (int listen_fd) |
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336 | struct accept * AcceptClientConnection (int listen_fd) |
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337 | { |
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338 | int newfd; |
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339 | struct sockaddr_in sa; |
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340 | socklen_t socklen; |
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341 | |
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342 | syslog (LOG_INFO, "AcceptClientConnection(fd%d)", listen_fd); |
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343 | |
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344 | // Accept the connection and create a new socket for it. |
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345 | socklen = sizeof (sa); |
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346 | memset (&sa, 0, socklen); |
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347 | do |
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348 | { |
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349 | newfd = accept (listen_fd, (struct sockaddr *) &sa, &socklen); |
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350 | } |
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351 | while ( (newfd < 0) && (errno == EINTR) ); |
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352 | |
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353 | syslog (LOG_INFO, "Accepted client connection on new socket fd%d", newfd); |
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354 | |
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355 | if ( newfd < 0 ) |
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356 | syslog (LOG_ERR, "accept(): %m"), exit (EXIT_FAILURE); |
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357 | |
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358 | if ( socklen != sizeof (sa) ) |
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359 | syslog (LOG_ERR, "accept() screwed up!"), exit (EXIT_FAILURE); |
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360 | |
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361 | //return (newfd); |
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362 | |
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363 | struct accept * new_accept = (struct accept *) malloc(sizeof(struct accept)); |
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364 | new_accept->newfd = newfd; |
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365 | new_accept->sa = sa; |
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366 | |
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367 | return (new_accept); |
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368 | } |
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369 | |
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370 | void VerifyClient(void * accept) |
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371 | { |
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372 | int jabber_fd = (int)NULL, |
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373 | connectionType = 0; |
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374 | struct accept * client = (struct accept *) accept; |
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375 | struct client * user = (struct client *)NULL; |
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376 | struct cat * info; |
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377 | pthread_t cat_thread; |
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378 | |
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379 | /*FILE *file; |
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380 | char line[80]; |
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381 | char *ips[20]; |
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382 | int cont; |
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383 | int j;*/ |
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384 | |
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385 | unsigned int addr = 0; |
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386 | char buf[250]; |
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387 | addr = ntohl(client->sa.sin_addr.s_addr); |
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388 | sprintf(buf,"%d.%d.%d.%d", |
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389 | (addr >> 24) , (addr >> 16) & 0xFF , |
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390 | (addr >> 8) & 0xFF , addr & 0xFF); |
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391 | printf("\nNew connection: %s\n", buf); |
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392 | |
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393 | /*if(!(file = fopen("/etc/socket_im/hosts","r"))) |
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394 | { |
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395 | printf("ImpossÃvel abrir o arquivo hosts \n"); |
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396 | exit(1); |
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397 | } |
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398 | |
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399 | fgets(line, 80, file); |
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400 | while(!feof(file)) |
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401 | { |
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402 | ips[cont] = malloc(sizeof(char)*17); |
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403 | line[strlen(line) - 1 ] = '\0'; |
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404 | strcpy(ips[cont], line); |
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405 | fgets(line, 80, file); |
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406 | cont++; |
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407 | } |
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408 | |
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409 | fclose(file); |
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410 | |
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411 | for( j = 0; j < cont; j++) |
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412 | { |
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413 | if( strcmp( buf, ips[j] ) == 0) |
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414 | { |
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415 | user = Handshake(client->newfd); |
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416 | jabber_fd = user->jabber_fd; |
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417 | connectionType = user->connectionType; |
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418 | break; |
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419 | } |
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420 | }*/ |
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421 | |
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422 | if ( strcmp(buf, "10.15.20.42") == 0 )//|| strcmp(buf, "10.15.20.202") == 0 || strcmp(buf, "10.15.20.145") == 0 ) |
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423 | { |
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424 | user = Handshake(client->newfd); |
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425 | jabber_fd = user->jabber_fd; |
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426 | connectionType = user->connectionType; |
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427 | } |
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428 | |
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429 | if ( jabber_fd == (int)NULL ) |
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430 | { |
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431 | jabber_fd = ConnectToServer(client->jabber_addr, client->jabber_port); |
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432 | |
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433 | if ( user != (struct client *)NULL ) |
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434 | user->jabber_fd = jabber_fd; |
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435 | } |
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436 | |
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437 | info = (struct cat *) malloc(sizeof(struct cat)); |
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438 | |
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439 | info->in_fd = jabber_fd; |
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440 | info->out_fd = client->newfd; |
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441 | info->jabber = (int)NULL; |
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442 | info->keep_alive = (int)NULL; |
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443 | info->client = user; |
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444 | info->connectionType = connectionType; |
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445 | |
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446 | if ( !connectionType ) |
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447 | { |
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448 | pthread_create(&cat_thread, NULL, (void *) &Reading, (void *)info ); |
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449 | pthread_create(&cat_thread, NULL, (void *) &Writing, (void *)info ); |
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450 | } |
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451 | else |
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452 | { |
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453 | if ( connectionType == 1 ) |
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454 | pthread_create(&cat_thread, NULL, (void *) &Reading, (void *)info ); |
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455 | else |
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456 | pthread_create(&cat_thread, NULL, (void *) &Writing, (void *)info ); |
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457 | } |
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458 | |
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459 | pthread_exit(0); |
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460 | } |
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461 | |
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462 | struct client * Handshake(int newfd) |
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463 | { |
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464 | float is_new_client;// = (float) NULL; |
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465 | int bytes_rcvd, |
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466 | bytes_sent, |
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467 | connectionType, |
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468 | i; |
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469 | |
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470 | unsigned char * const buf = (char *) malloc (sizeof(char) * 5); |
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471 | char * user = (char *) malloc(128 * sizeof(char)), |
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472 | * pass = (char *) malloc(128 * sizeof(char)), |
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473 | * type = (char *) malloc(128 * sizeof(char)); |
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474 | |
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475 | //struct client * clients = (struct client *)NULL; |
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476 | struct client * new_client = (struct client *)NULL; |
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477 | |
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478 | bzero(buf, 5); |
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479 | sprintf(buf, "user"); |
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480 | for ( i = 0; i < sizeof(buf); i += bytes_sent ) |
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481 | { |
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482 | bytes_sent = send (newfd, buf + i, sizeof(buf) - i, 0); |
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483 | |
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484 | if ( bytes_sent < 0 ) |
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485 | break; |
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486 | } |
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487 | |
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488 | bzero(user, 128); |
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489 | if ( (bytes_rcvd = recv (newfd, user, 128, 0)) < 1 ) |
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490 | { |
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491 | printf("USER....: %s", user); |
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492 | shutdown(newfd, SHUT_RDWR); |
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493 | close(newfd); |
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494 | pthread_exit(0); |
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495 | } |
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496 | |
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497 | bzero(buf, 5); |
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498 | sprintf(buf, "pass"); |
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499 | for ( i = 0; i < sizeof(buf); i += bytes_sent ) |
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500 | { |
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501 | bytes_sent = send (newfd, buf + i, sizeof(buf) - i, 0); |
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502 | |
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503 | if ( bytes_sent < 0 ) |
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504 | break; |
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505 | } |
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506 | |
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507 | bzero(pass, 128); |
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508 | if ( (bytes_rcvd = recv (newfd, pass, 128, 0)) < 1 ) |
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509 | { |
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510 | printf("PASS....: %s", pass); |
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511 | shutdown(newfd, SHUT_RDWR); |
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512 | close(newfd); |
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513 | pthread_exit(0); |
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514 | } |
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515 | |
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516 | bzero(buf, 5); |
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517 | sprintf(buf, "type"); |
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518 | for ( i = 0; i < sizeof(buf); i += bytes_sent ) |
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519 | { |
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520 | bytes_sent = send (newfd, buf + i, sizeof(buf) - i, 0); |
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521 | |
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522 | if ( bytes_sent < 0 ) |
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523 | break; |
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524 | } |
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525 | |
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526 | bzero(type, 128); |
---|
527 | if ( (bytes_rcvd = recv (newfd, type, 128, 0)) < 1 ) |
---|
528 | { |
---|
529 | printf("TYPE....: %s", type); |
---|
530 | shutdown(newfd, SHUT_RDWR); |
---|
531 | close(newfd); |
---|
532 | pthread_exit(0); |
---|
533 | } |
---|
534 | |
---|
535 | pthread_mutex_lock (&mutexsum); |
---|
536 | if ( clients == (struct client *)NULL ) |
---|
537 | { |
---|
538 | clients = (struct client *) malloc(sizeof(struct client)); |
---|
539 | |
---|
540 | new_client = clients; |
---|
541 | new_client->previous = (struct client *)NULL; |
---|
542 | is_new_client = 1; |
---|
543 | } |
---|
544 | else |
---|
545 | { |
---|
546 | new_client = clients; |
---|
547 | while ( ((is_new_client = (float)strcmp(new_client->user, user)) != 0) && (new_client->next != (struct client *)NULL) ) |
---|
548 | new_client = new_client->next; |
---|
549 | } |
---|
550 | |
---|
551 | if ( is_new_client != 0 ) |
---|
552 | { |
---|
553 | new_client->next = (struct client *) malloc(sizeof(struct client)); |
---|
554 | new_client->next->previous = new_client; |
---|
555 | new_client = new_client->next; |
---|
556 | new_client->user = user; |
---|
557 | new_client->jabber_fd = (int)NULL; |
---|
558 | new_client->keep_alive = 1; |
---|
559 | new_client->next = (struct client *)NULL; |
---|
560 | } |
---|
561 | |
---|
562 | bzero(buf, 5); |
---|
563 | if ( is_new_client != 0 || new_client->jabber_fd == (int)NULL ) |
---|
564 | sprintf(buf, "new"); |
---|
565 | else |
---|
566 | sprintf(buf, "rec"); |
---|
567 | |
---|
568 | send (newfd, buf, 3, 0); |
---|
569 | |
---|
570 | new_client->client_fd = newfd; |
---|
571 | new_client->last_action = time(NULL); |
---|
572 | new_client->connectionType = 0; |
---|
573 | pthread_mutex_unlock(&mutexsum); |
---|
574 | |
---|
575 | if ( strcmp(type, "read") == 0 ) |
---|
576 | new_client->connectionType = 1; |
---|
577 | else |
---|
578 | if ( strcmp(type, "write") == 0 ) |
---|
579 | new_client->connectionType = 2; |
---|
580 | |
---|
581 | return new_client; |
---|
582 | } |
---|
583 | |
---|
584 | // ConnectToServer() |
---|
585 | // attempts a tcp connect to the server specified |
---|
586 | // by addr and port. Bombs on failure to connect, |
---|
587 | // returns the fd of the new socket on success. |
---|
588 | int ConnectToServer (struct in_addr addr, unsigned short port) |
---|
589 | { |
---|
590 | // TODO: have a timeout for connect() - see Unix socket FAQ 6.2 |
---|
591 | |
---|
592 | int fd, err; |
---|
593 | struct sockaddr_in sa; |
---|
594 | |
---|
595 | // Create a socket and get its descriptor. |
---|
596 | fd = socket (AF_INET, SOCK_STREAM, 0); |
---|
597 | |
---|
598 | if ( fd < 0 ) |
---|
599 | syslog (LOG_ERR, "socket(): %m"), exit (EXIT_FAILURE); |
---|
600 | |
---|
601 | sa.sin_family = AF_INET; |
---|
602 | sa.sin_port = htons (port); |
---|
603 | sa.sin_addr = addr; |
---|
604 | memset (sa.sin_zero, 0, sizeof (sa.sin_zero)); |
---|
605 | |
---|
606 | err = connect (fd, (struct sockaddr *) &sa, sizeof (sa)); |
---|
607 | if (err < 0) |
---|
608 | { |
---|
609 | syslog (LOG_ERR, "Unable to connect socket fd%d to server: %m", fd); |
---|
610 | exit (EXIT_FAILURE); |
---|
611 | } |
---|
612 | |
---|
613 | syslog (LOG_INFO, "Connected socket fd%d to server", fd); |
---|
614 | |
---|
615 | return fd; |
---|
616 | } |
---|
617 | |
---|
618 | // Cat() |
---|
619 | // read data from in_fd and write it to out_fd until |
---|
620 | // the connection is closed by one of the peers. |
---|
621 | // Data is copied using a dynamically allocated buffer. |
---|
622 | void Reading (void * info) |
---|
623 | { |
---|
624 | unsigned char * const buf = (char *) malloc (sizeof(char) * BUF_SIZE); |
---|
625 | int bytes_rcvd, |
---|
626 | bytes_sent = (int) NULL, |
---|
627 | i; |
---|
628 | |
---|
629 | struct cat * user = (struct cat *) info; |
---|
630 | int in_fd = user->in_fd, |
---|
631 | out_fd = user->out_fd; |
---|
632 | |
---|
633 | syslog (LOG_INFO, "Reading(fd%d, fd%d)", in_fd, out_fd); |
---|
634 | |
---|
635 | // @TODO: verificar alocacao buffer |
---|
636 | //if ( buf == NULL ) |
---|
637 | // syslog (LOG_ERR, "malloc(): %m"), exit (EXIT_FAILURE); |
---|
638 | |
---|
639 | do |
---|
640 | { |
---|
641 | bzero(buf, BUF_SIZE); |
---|
642 | bytes_rcvd = recv (in_fd, buf, BUF_SIZE, 0); |
---|
643 | |
---|
644 | // descomentar para ver oq esta passado de informacao |
---|
645 | //puts(buf); |
---|
646 | |
---|
647 | for ( i = 0; i < bytes_rcvd; i += bytes_sent ) |
---|
648 | { |
---|
649 | bytes_sent = send (out_fd, buf + i, bytes_rcvd - i, 0); |
---|
650 | |
---|
651 | if ( bytes_sent < 0 ) |
---|
652 | break; |
---|
653 | } |
---|
654 | } |
---|
655 | while ( (bytes_rcvd > 0) && (bytes_sent > 0) ); |
---|
656 | |
---|
657 | //if ( (bytes_rcvd < 0) && (errno != ECONNRESET) ) |
---|
658 | // syslog (LOG_ERR, "recv(): %m"), exit (EXIT_FAILURE); |
---|
659 | |
---|
660 | //if ( (bytes_sent < 0) && (errno != EPIPE) ) |
---|
661 | // syslog (LOG_ERR, "send(): %m"), exit (EXIT_FAILURE); |
---|
662 | |
---|
663 | free (buf); |
---|
664 | //shutdown (user->out_fd, SHUT_RDWR); |
---|
665 | close (user->out_fd); |
---|
666 | close (user->out_fd); |
---|
667 | pthread_exit(0); |
---|
668 | } |
---|
669 | |
---|
670 | void Writing (void * info) |
---|
671 | { |
---|
672 | unsigned char * const buf = (char *) malloc (sizeof(char) * BUF_SIZE); |
---|
673 | int bytes_rcvd, |
---|
674 | bytes_sent = (int) NULL, |
---|
675 | i; |
---|
676 | |
---|
677 | struct cat * user = (struct cat *) info; |
---|
678 | int in_fd = user->out_fd, |
---|
679 | out_fd = user->in_fd; |
---|
680 | |
---|
681 | syslog (LOG_INFO, "Writing(fd%d, fd%d)", in_fd, out_fd); |
---|
682 | |
---|
683 | // @TODO: verificar alocacao buffer |
---|
684 | //if ( buf == NULL ) |
---|
685 | // syslog (LOG_ERR, "malloc(): %m"), exit (EXIT_FAILURE); |
---|
686 | |
---|
687 | do |
---|
688 | { |
---|
689 | bzero(buf, BUF_SIZE); |
---|
690 | bytes_rcvd = recv (in_fd, buf, BUF_SIZE, 0); |
---|
691 | |
---|
692 | // descomentar para ver oq esta passado de informacao |
---|
693 | //puts(buf); |
---|
694 | |
---|
695 | for ( i = 0; i < bytes_rcvd; i += bytes_sent ) |
---|
696 | { |
---|
697 | bytes_sent = send (out_fd, buf + i, bytes_rcvd - i, 0); |
---|
698 | |
---|
699 | if ( bytes_sent < 0 ) |
---|
700 | break; |
---|
701 | } |
---|
702 | } |
---|
703 | while ( (bytes_rcvd > 0) && (bytes_sent > 0) ); |
---|
704 | |
---|
705 | //if ( (bytes_rcvd < 0) && (errno != ECONNRESET) ) |
---|
706 | // syslog (LOG_ERR, "recv(): %m"), exit (EXIT_FAILURE); |
---|
707 | |
---|
708 | //if ( (bytes_sent < 0) && (errno != EPIPE) ) |
---|
709 | // syslog (LOG_ERR, "send(): %m"), exit (EXIT_FAILURE); |
---|
710 | |
---|
711 | free (buf); |
---|
712 | //shutdown (user->out_fd, SHUT_RDWR); |
---|
713 | close (user->out_fd); |
---|
714 | close (user->out_fd); |
---|
715 | pthread_exit(0); |
---|
716 | } |
---|
717 | |
---|
718 | // NameToAddress() |
---|
719 | // Convert name to an ip address. |
---|
720 | // Returns 0 on success, -1 on failure. |
---|
721 | int NameToAddr (const char * name, struct in_addr * p_inaddr) |
---|
722 | { |
---|
723 | struct hostent * he; |
---|
724 | |
---|
725 | // First, attempt to convert from string ip format |
---|
726 | // TODO: use inet_aton() instead |
---|
727 | p_inaddr->s_addr = inet_addr (name); |
---|
728 | if ( p_inaddr->s_addr != -1U ) // Success |
---|
729 | return 0; |
---|
730 | |
---|
731 | // Next, attempt to read from /etc/hosts or do a DNS lookup |
---|
732 | he = gethostbyname (name); |
---|
733 | if ( he != NULL ) // Success |
---|
734 | { |
---|
735 | memcpy (p_inaddr, he->h_addr, sizeof (struct in_addr)); |
---|
736 | return 0; |
---|
737 | } |
---|
738 | |
---|
739 | return -1; // Failed to resolve name to an ip address |
---|
740 | } |
---|
741 | |
---|
742 | // NameToPort() |
---|
743 | // Convert name to a port number. Name can either be a port name |
---|
744 | // (in which case proto must also be set to either "tcp" or "udp") |
---|
745 | // or name can be the ascii representation of the port number. |
---|
746 | // Returns 0 on success, -1 on failure. |
---|
747 | int NameToPort (const char * name, unsigned short * port, const char * proto) |
---|
748 | { |
---|
749 | unsigned long lport; |
---|
750 | char * errpos; |
---|
751 | struct servent * se; |
---|
752 | |
---|
753 | // First, attempt to convert string to integer |
---|
754 | lport = strtoul (name, &errpos, 0); |
---|
755 | if ( (*errpos == 0) && (lport <= 65535) ) // Success |
---|
756 | { |
---|
757 | *port = lport; |
---|
758 | return 0; |
---|
759 | } |
---|
760 | |
---|
761 | // Next, attempt to read the string from /etc/services |
---|
762 | se = getservbyname (name, proto); |
---|
763 | if ( se != NULL) // Success |
---|
764 | { |
---|
765 | *port = ntohs (se->s_port); |
---|
766 | return 0; |
---|
767 | } |
---|
768 | |
---|
769 | return -1; // Failed to resolve port name to a number |
---|
770 | } |
---|
771 | |
---|
772 | // quit() |
---|
773 | // Print an error message to stderr |
---|
774 | // and syslog, then exit the program. |
---|
775 | void quit (const char * fmt, ...) // quit with msg |
---|
776 | { |
---|
777 | va_list ap; |
---|
778 | |
---|
779 | fflush (stdout); |
---|
780 | |
---|
781 | fprintf (stderr, "%s: ", g_program_name); |
---|
782 | |
---|
783 | va_start (ap, fmt); |
---|
784 | vfprintf (stderr, fmt, ap); |
---|
785 | va_end (ap); |
---|
786 | |
---|
787 | fputc ('\n', stderr); |
---|
788 | |
---|
789 | syslog (LOG_ERR, "I quit!"); |
---|
790 | |
---|
791 | exit (EXIT_FAILURE); |
---|
792 | } |
---|
793 | |
---|
794 | // pbomb() |
---|
795 | // Print an error message to stderr |
---|
796 | // and syslog, then exit the program. |
---|
797 | // pbomb() additionally include the |
---|
798 | // string representation of errno. |
---|
799 | void pbomb (const char * fmt, ...) // bomb with perror |
---|
800 | { |
---|
801 | va_list ap; |
---|
802 | int errno_save = errno; |
---|
803 | char buf[100]; |
---|
804 | |
---|
805 | fflush (stdout); |
---|
806 | |
---|
807 | fprintf (stderr, "%s: ", g_program_name); |
---|
808 | |
---|
809 | va_start (ap, fmt); |
---|
810 | vsnprintf (buf, sizeof (buf), fmt, ap); |
---|
811 | va_end (ap); |
---|
812 | |
---|
813 | errno = errno_save; |
---|
814 | perror (buf); |
---|
815 | |
---|
816 | syslog (LOG_ERR, "Bang!: %s: %m", buf); |
---|
817 | |
---|
818 | exit (EXIT_FAILURE); |
---|
819 | } |
---|
820 | |
---|
821 | // hbomb() |
---|
822 | // Print an error message to stderr |
---|
823 | // and syslog, then exit the program. |
---|
824 | // hbomb() additionally include the |
---|
825 | // string representation of h_errno. |
---|
826 | void hbomb (const char * fmt, ...) // bomb with herror |
---|
827 | { |
---|
828 | va_list ap; |
---|
829 | int h_errno_save = h_errno; |
---|
830 | char buf[100]; |
---|
831 | |
---|
832 | fflush (stdout); |
---|
833 | |
---|
834 | fprintf (stderr, "%s: ", g_program_name); |
---|
835 | |
---|
836 | va_start (ap, fmt); |
---|
837 | vsnprintf (buf, sizeof (buf), fmt, ap); |
---|
838 | va_end (ap); |
---|
839 | |
---|
840 | h_errno = h_errno_save; |
---|
841 | herror (buf); |
---|
842 | |
---|
843 | syslog (LOG_ERR, "Bang!: %s: %s", buf, hstrerror (h_errno)); |
---|
844 | |
---|
845 | exit (EXIT_FAILURE); |
---|
846 | } |
---|
847 | |
---|
848 | // set_signal_handler() |
---|
849 | // Sets a signal handler function. |
---|
850 | // Similar to signal() but this method |
---|
851 | // is more portable between platforms. |
---|
852 | void set_signal_handler (int signum, signal_handler_t sa_handler_func) |
---|
853 | { |
---|
854 | struct sigaction act; |
---|
855 | |
---|
856 | act.sa_handler = sa_handler_func; |
---|
857 | sigemptyset (&(act.sa_mask)); |
---|
858 | act.sa_flags = 0; |
---|
859 | |
---|
860 | if ( sigaction (signum, &act, NULL) < 0 ) |
---|
861 | { |
---|
862 | syslog (LOG_ERR, "Error setting handler for signal %d: %m", signum); |
---|
863 | exit (EXIT_FAILURE); |
---|
864 | } |
---|
865 | } |
---|