[260] | 1 | #include "server.h" |
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| 2 | |
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| 3 | struct accept |
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| 4 | { |
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| 5 | int newfd; |
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| 6 | struct sockaddr_in sa; |
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| 7 | struct in_addr jabber_addr; |
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| 8 | unsigned short jabber_port; |
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| 9 | }; |
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| 10 | |
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| 11 | struct client |
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| 12 | { |
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| 13 | char * user; |
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| 14 | int client_fd; |
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| 15 | int jabber_fd; |
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| 16 | int keep_alive; |
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| 17 | time_t last_action; |
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| 18 | struct client * next; |
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| 19 | }; |
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| 20 | |
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| 21 | struct cat |
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| 22 | { |
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| 23 | int in_fd, |
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| 24 | out_fd; |
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| 25 | int jabber, |
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| 26 | keep_alive; |
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| 27 | struct client * client; |
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| 28 | }; |
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| 29 | |
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| 30 | struct client * clients = (struct client *)NULL; |
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| 31 | |
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| 32 | pthread_mutex_t mutexsum; |
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| 33 | |
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| 34 | int main (int argc, char ** argv) |
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| 35 | { |
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| 36 | struct in_addr remote_addr, |
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| 37 | local_addr; |
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| 38 | unsigned short remote_port, |
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| 39 | local_port; |
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| 40 | int listen_fd; |
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| 41 | |
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| 42 | ParseArgs (argc, argv, &remote_addr, &remote_port, &local_addr, &local_port); |
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| 43 | |
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| 44 | Initialise (); |
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| 45 | |
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| 46 | // Create server socket before becoming a daemon so |
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| 47 | // there is still a chance to print an error message. |
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| 48 | listen_fd = CreateServerSocket (local_addr, local_port); |
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| 49 | if ( listen_fd < 0 ) |
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| 50 | pbomb ("Unable to create server socket"); |
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| 51 | |
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| 52 | //Daemonise (); |
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| 53 | |
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| 54 | MainLoop (listen_fd, remote_addr, remote_port); // never returns |
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| 55 | |
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| 56 | exit (EXIT_SUCCESS); |
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| 57 | } |
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| 58 | |
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| 59 | // ParseArgs() |
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| 60 | // Parse the command line arguments to extract the remote |
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| 61 | // and local adresses and port numbers, ra, rp, la & lp. |
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| 62 | // Exit the program gracefully upon error. |
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| 63 | void ParseArgs (int argc, char ** argv, struct in_addr * ra, unsigned short * rp, struct in_addr * la, unsigned short * lp) |
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| 64 | { |
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| 65 | // argv[0] = program name |
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| 66 | // argv[1] = remote_addr |
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| 67 | // argv[2] = remote_port |
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| 68 | // argv[3] = local_addr (optional) |
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| 69 | // argv[4] = local_port (optional) |
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| 70 | |
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| 71 | char * p = strrchr (argv[0], '/'); |
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| 72 | |
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| 73 | strncpy (g_program_name, (p == NULL) ? argv[0] : p + 1, sizeof (g_program_name) - 1); |
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| 74 | |
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| 75 | if ( (argc < 3) || (argc > 5) ) |
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| 76 | { |
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| 77 | fprintf (stderr, "usage: %s remote_addr remote_port [local_addr] [local_port]\n", argv[0]); |
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| 78 | exit (EXIT_FAILURE); |
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| 79 | } |
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| 80 | |
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| 81 | if ( NameToAddr (argv[1], ra) ) |
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| 82 | hbomb ("Unable to resolve \"%s\" to an ip address", argv[1]); |
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| 83 | |
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| 84 | if ( NameToPort (argv[2], rp, "tcp") ) |
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| 85 | quit ("Unable to resolve \"%s\" to a port number", argv[2]); |
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| 86 | |
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| 87 | if ( argc < 4 ) |
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| 88 | la->s_addr = htonl (INADDR_ANY); |
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| 89 | else |
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| 90 | if ( NameToAddr (argv[3], la) ) |
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| 91 | hbomb ("Unable to resolve \"%s\" to an ip address", argv[3]); |
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| 92 | |
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| 93 | if ( argc < 5 ) |
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| 94 | memcpy (lp, rp, sizeof (*lp)); |
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| 95 | else |
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| 96 | if ( NameToPort (argv[4], lp, "tcp") ) |
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| 97 | quit ("Unable to resolve \"%s\" to a port number", argv[4]); |
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| 98 | } |
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| 99 | |
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| 100 | // Initialise() |
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| 101 | // Setup syslog, signal handlers, and other intialisation. |
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| 102 | void Initialise (void) |
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| 103 | { |
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| 104 | openlog (g_program_name, LOG_PID, LOG_USER); |
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| 105 | syslog (LOG_INFO, "%s started", g_program_name); |
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| 106 | |
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| 107 | chdir ("/"); // Change working directory to the root. |
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| 108 | |
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| 109 | umask (0); // Clear our file mode creation mask |
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| 110 | |
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| 111 | //set_signal_handler (SIGCHLD, sig_child); |
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| 112 | |
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| 113 | //signal (SIGPIPE, SIG_IGN); |
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| 114 | } |
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| 115 | |
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| 116 | // CreateServerSocket() |
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| 117 | // Create a socket, bind it to the specified address |
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| 118 | // and port, and set it to listen for client connections. |
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| 119 | // Returns < 0 on failure to bind, bombs on error otherwise, |
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| 120 | // returns the fd of the new socket on success. |
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| 121 | int CreateServerSocket (struct in_addr addr, unsigned short port) |
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| 122 | { |
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| 123 | int err, |
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| 124 | fd; |
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| 125 | const int on = 1; |
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| 126 | struct sockaddr_in sa; |
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| 127 | |
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| 128 | // Create a socket and get its descriptor. |
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| 129 | fd = socket (AF_INET, SOCK_STREAM, 0); |
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| 130 | if ( fd < 0 ) |
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| 131 | syslog (LOG_ERR, "socket(): %m"), exit (EXIT_FAILURE); |
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| 132 | |
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| 133 | // Set SO_REUSEADDR socket option |
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| 134 | if ( setsockopt (fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof (on)) < 0 ) |
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| 135 | syslog (LOG_ERR, "setsockopt(fd%d, SO_REUSEADDR): %m", fd); |
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| 136 | |
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| 137 | // Load a sa structure with the specified address and port |
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| 138 | sa.sin_family = AF_INET; |
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| 139 | sa.sin_port = htons (port); |
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| 140 | //sa.sin_addr = addr; |
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| 141 | sa.sin_addr.s_addr = htonl(INADDR_ANY); |
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| 142 | memset (sa.sin_zero, 0, sizeof (sa.sin_zero)); |
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| 143 | |
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| 144 | // Bind our socket to the address and port specified |
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| 145 | err = bind (fd, (struct sockaddr *) &sa, sizeof (sa)); |
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| 146 | if ( err < 0 ) |
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| 147 | { |
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| 148 | syslog (LOG_ERR, "bind(): %m"); |
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| 149 | return err; |
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| 150 | } |
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| 151 | |
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| 152 | // Tell socket to listen and queue up to 5 incoming connections. |
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| 153 | if ( listen (fd, 5) < 0 ) |
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| 154 | syslog (LOG_ERR, "listen(): %m"), exit (EXIT_FAILURE); |
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| 155 | |
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| 156 | return fd; |
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| 157 | } |
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| 158 | |
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| 159 | // MainLoop() |
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| 160 | // Classic concurrent server model. |
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| 161 | // Wait for a client to connect, fork a child process |
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| 162 | // to do the business with the client, parent process |
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| 163 | // continues to wait for the next connection. |
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| 164 | // This function does not return. |
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| 165 | void MainLoop (int listen_fd, struct in_addr rem_addr, unsigned short rem_port) |
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| 166 | { |
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| 167 | struct accept * accept; |
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| 168 | pthread_t accept_thread, |
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| 169 | clear_list_thread; |
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| 170 | |
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| 171 | pthread_mutex_init(&mutexsum, NULL); |
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| 172 | |
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| 173 | pthread_create(&clear_list_thread, NULL, (void *) &ClearList, (void *)NULL ); |
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| 174 | |
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| 175 | for ( ; ; ) |
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| 176 | { |
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| 177 | accept = AcceptClientConnection (listen_fd); |
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| 178 | accept->jabber_addr = rem_addr; |
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| 179 | accept->jabber_port = rem_port; |
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| 180 | |
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| 181 | pthread_create(&accept_thread, NULL, (void *) &VerifyClient, (void *) accept); |
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| 182 | } |
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| 183 | pthread_mutex_destroy(&mutexsum); |
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| 184 | pthread_exit(NULL); |
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| 185 | } |
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| 186 | |
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| 187 | void ClearList(void) |
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| 188 | { |
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| 189 | struct client * current; |
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| 190 | |
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| 191 | for ( ; ; ) |
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| 192 | { |
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| 193 | current = clients; |
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| 194 | pthread_mutex_lock(&mutexsum); |
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| 195 | while ( current != (struct client *)NULL ) |
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| 196 | { |
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| 197 | if ( time(NULL) - current->last_action > 30 ) |
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| 198 | { |
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| 199 | shutdown(current->jabber_fd, SHUT_RDWR); |
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| 200 | close(current->jabber_fd); |
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| 201 | current->jabber_fd = (int)NULL; |
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| 202 | } |
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| 203 | current = current->next; |
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| 204 | } |
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| 205 | pthread_mutex_unlock(&mutexsum); |
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| 206 | sleep(2); |
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| 207 | } |
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| 208 | } |
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| 209 | |
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| 210 | // AcceptClientConnection() |
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| 211 | // waits for a tcp connect to the socket listen_fd, which |
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| 212 | // must already be bound and set to listen on a local port. |
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| 213 | // Bombs on error, returns the fd of the new socket on success. |
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| 214 | struct accept * AcceptClientConnection (int listen_fd) |
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| 215 | { |
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| 216 | int newfd; |
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| 217 | struct sockaddr_in sa; |
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| 218 | socklen_t socklen; |
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| 219 | |
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| 220 | syslog (LOG_INFO, "AcceptClientConnection(fd%d)", listen_fd); |
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| 221 | |
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| 222 | // Accept the connection and create a new socket for it. |
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| 223 | socklen = sizeof (sa); |
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| 224 | memset (&sa, 0, socklen); |
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| 225 | do |
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| 226 | { |
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| 227 | newfd = accept (listen_fd, (struct sockaddr *) &sa, &socklen); |
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| 228 | } |
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| 229 | while ( (newfd < 0) && (errno == EINTR) ); |
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| 230 | |
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| 231 | syslog (LOG_INFO, "Accepted client connection on new socket fd%d", newfd); |
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| 232 | |
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| 233 | if ( newfd < 0 ) |
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| 234 | syslog (LOG_ERR, "accept(): %m"), exit (EXIT_FAILURE); |
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| 235 | |
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| 236 | if ( socklen != sizeof (sa) ) |
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| 237 | syslog (LOG_ERR, "accept() screwed up!"), exit (EXIT_FAILURE); |
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| 238 | |
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| 239 | struct accept * new_accept = (struct accept *) malloc(sizeof(struct accept)); |
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| 240 | new_accept->newfd = newfd; |
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| 241 | new_accept->sa = sa; |
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| 242 | |
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| 243 | return (new_accept); |
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| 244 | } |
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| 245 | |
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| 246 | void VerifyClient(void * accept) |
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| 247 | { |
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| 248 | int jabber_fd = (int)NULL; |
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| 249 | struct accept * client = (struct accept *) accept; |
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| 250 | struct client * user = (struct client *)NULL; |
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| 251 | struct cat * info_1, |
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| 252 | * info_2; |
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| 253 | pthread_t client_server_thread, |
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| 254 | server_client_thread; |
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| 255 | |
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| 256 | unsigned int addr = 0; |
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| 257 | char buf[250]; |
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| 258 | addr = ntohl(client->sa.sin_addr.s_addr); |
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| 259 | sprintf(buf,"%d.%d.%d.%d", |
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| 260 | (addr >> 24) , (addr >> 16) & 0xFF , |
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| 261 | (addr >> 8) & 0xFF , addr & 0xFF); |
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| 262 | //printf("New connection: %s\n", buf); |
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| 263 | |
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| 264 | if ( strcmp(buf, "10.15.20.202") == 0 ) |
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| 265 | { |
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| 266 | user = Handshake(client->newfd); |
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| 267 | jabber_fd = user->jabber_fd; |
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| 268 | } |
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| 269 | |
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| 270 | if ( jabber_fd == (int)NULL ) |
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| 271 | { |
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| 272 | jabber_fd = ConnectToServer(client->jabber_addr, client->jabber_port); |
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| 273 | |
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| 274 | if ( user != (struct client *)NULL ) |
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| 275 | user->jabber_fd = jabber_fd; |
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| 276 | } |
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| 277 | |
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| 278 | info_1 = (struct cat *) malloc(sizeof(struct cat)); |
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| 279 | info_2 = (struct cat *) malloc(sizeof(struct cat)); |
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| 280 | |
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| 281 | info_1->out_fd = jabber_fd; |
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| 282 | info_1->in_fd = client->newfd; |
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| 283 | info_1->jabber = (int)NULL; |
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| 284 | info_1->keep_alive = (int)NULL; |
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| 285 | info_1->client = user; |
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| 286 | |
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| 287 | pthread_create(&client_server_thread, NULL, (void *) &Cat, (void *)info_1 ); |
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| 288 | |
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| 289 | info_2->in_fd = jabber_fd; |
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| 290 | info_2->out_fd = client->newfd; |
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| 291 | info_2->jabber = jabber_fd; |
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| 292 | info_2->keep_alive = (int)NULL; |
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| 293 | if ( user != (struct client *)NULL ) |
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| 294 | info_2->keep_alive = 1; |
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| 295 | info_2->client = (struct client *)NULL; |
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| 296 | |
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| 297 | pthread_create(&client_server_thread, NULL, (void *) &Cat, (void *)info_2 ); |
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| 298 | |
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| 299 | pthread_exit(0); |
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| 300 | } |
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| 301 | |
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| 302 | struct client * Handshake(int newfd) |
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| 303 | { |
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| 304 | float is_new_client;// = (float) NULL; |
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| 305 | int bytes_rcvd, |
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| 306 | bytes_sent, |
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| 307 | i; |
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| 308 | |
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| 309 | unsigned char * const buf = (char *) malloc (sizeof(char) * 5); |
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| 310 | char * user = (char *) malloc(128 * sizeof(char)), |
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| 311 | * pass = (char *) malloc(128 * sizeof(char)); |
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| 312 | |
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| 313 | //struct client * clients = (struct client *)NULL; |
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| 314 | struct client * new_client = (struct client *)NULL; |
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| 315 | |
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| 316 | bzero(buf, 5); |
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| 317 | sprintf(buf, "user"); |
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| 318 | for ( i = 0; i < sizeof(buf); i += bytes_sent ) |
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| 319 | { |
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| 320 | bytes_sent = send (newfd, buf + i, sizeof(buf) - i, 0); |
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| 321 | |
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| 322 | if ( bytes_sent < 0 ) |
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| 323 | break; |
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| 324 | } |
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| 325 | |
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| 326 | bzero(user, 128); |
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| 327 | if ( (bytes_rcvd = recv (newfd, user, 128, 0)) < 1 ) |
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| 328 | pthread_exit(0); |
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| 329 | |
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| 330 | bzero(buf, 5); |
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| 331 | sprintf(buf, "pass"); |
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| 332 | for ( i = 0; i < sizeof(buf); i += bytes_sent ) |
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| 333 | { |
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| 334 | bytes_sent = send (newfd, buf + i, sizeof(buf) - i, 0); |
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| 335 | |
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| 336 | if ( bytes_sent < 0 ) |
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| 337 | break; |
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| 338 | } |
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| 339 | |
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| 340 | bzero(pass, 128); |
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| 341 | if ( (bytes_rcvd = recv (newfd, pass, 128, 0)) < 1 ) |
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| 342 | pthread_exit(0); |
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| 343 | |
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| 344 | pthread_mutex_lock (&mutexsum); |
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| 345 | if ( clients == (struct client *)NULL ) |
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| 346 | { |
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| 347 | clients = (struct client *) malloc(sizeof(struct client)); |
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| 348 | |
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| 349 | new_client = clients; |
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| 350 | is_new_client = 1; |
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| 351 | } |
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| 352 | else |
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| 353 | { |
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| 354 | new_client = clients; |
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| 355 | while ( ((is_new_client = (float)strcmp(new_client->user, user)) != 0) && (new_client->next != (struct client *)NULL) ) |
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| 356 | new_client = new_client->next; |
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| 357 | |
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| 358 | if ( is_new_client != 0 ) |
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| 359 | { |
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| 360 | new_client->next = (struct client *) malloc(sizeof(struct client)); |
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| 361 | new_client = new_client->next; |
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| 362 | } |
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| 363 | } |
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| 364 | |
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| 365 | if ( is_new_client != 0 ) |
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| 366 | { |
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| 367 | new_client->user = user; |
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| 368 | new_client->jabber_fd = (int)NULL; |
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| 369 | new_client->keep_alive = 1; |
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| 370 | new_client->next = (struct client *)NULL; |
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| 371 | } |
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| 372 | new_client->client_fd = newfd; |
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| 373 | new_client->last_action = time(NULL); |
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| 374 | pthread_mutex_unlock(&mutexsum); |
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| 375 | |
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| 376 | return new_client; |
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| 377 | } |
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| 378 | |
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| 379 | // ConnectToServer() |
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| 380 | // attempts a tcp connect to the server specified |
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| 381 | // by addr and port. Bombs on failure to connect, |
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| 382 | // returns the fd of the new socket on success. |
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| 383 | int ConnectToServer (struct in_addr addr, unsigned short port) |
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| 384 | { |
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| 385 | // TODO: have a timeout for connect() - see Unix socket FAQ 6.2 |
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| 386 | |
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| 387 | int fd, err; |
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| 388 | struct sockaddr_in sa; |
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| 389 | |
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| 390 | // Create a socket and get its descriptor. |
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| 391 | fd = socket (AF_INET, SOCK_STREAM, 0); |
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| 392 | |
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| 393 | if ( fd < 0 ) |
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| 394 | syslog (LOG_ERR, "socket(): %m"), pthread_exit(0);//exit (EXIT_FAILURE); |
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| 395 | |
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| 396 | sa.sin_family = AF_INET; |
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| 397 | sa.sin_port = htons (port); |
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| 398 | sa.sin_addr = addr; |
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| 399 | memset (sa.sin_zero, 0, sizeof (sa.sin_zero)); |
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| 400 | |
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| 401 | err = connect (fd, (struct sockaddr *) &sa, sizeof (sa)); |
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| 402 | if (err < 0) |
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| 403 | { |
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| 404 | syslog (LOG_ERR, "Unable to connect socket fd%d to server: %m", fd); |
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| 405 | //exit (EXIT_FAILURE); |
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| 406 | pthread_exit(0); |
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| 407 | } |
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| 408 | |
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| 409 | syslog (LOG_INFO, "Connected socket fd%d to server", fd); |
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| 410 | |
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| 411 | return fd; |
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| 412 | } |
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| 413 | |
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| 414 | // Cat() |
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| 415 | // read data from in_fd and write it to out_fd until |
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| 416 | // the connection is closed by one of the peers. |
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| 417 | // Data is copied using a dynamically allocated buffer. |
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| 418 | //void Cat (int in_fd, int out_fd) |
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| 419 | //void Cat (int in_fd, int out_fd) |
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| 420 | void Cat (void * info) |
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| 421 | { |
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| 422 | unsigned char * const buf = (char *) malloc (sizeof(char) * BUF_SIZE); |
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| 423 | int bytes_rcvd, |
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| 424 | bytes_sent = (int) NULL, |
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| 425 | i, |
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| 426 | in_fd, |
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| 427 | out_fd; |
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| 428 | struct cat * user = (struct cat *) info; |
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| 429 | in_fd = user->in_fd; |
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| 430 | out_fd = user->out_fd; |
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| 431 | |
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| 432 | syslog (LOG_INFO, "Cat(fd%d, fd%d)", in_fd, out_fd); |
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| 433 | |
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| 434 | if ( buf == NULL ) |
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| 435 | syslog (LOG_ERR, "malloc(): %m"), exit (EXIT_FAILURE); |
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| 436 | |
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| 437 | do |
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| 438 | { |
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| 439 | bzero(buf, BUF_SIZE); |
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| 440 | bytes_rcvd = recv (in_fd, buf, BUF_SIZE, 0); |
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| 441 | |
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| 442 | for ( i = 0; i < bytes_rcvd; i += bytes_sent ) |
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| 443 | { |
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| 444 | bytes_sent = send (out_fd, buf + i, bytes_rcvd - i, 0); |
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| 445 | |
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| 446 | if ( bytes_sent < 0 ) |
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| 447 | break; |
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| 448 | } |
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| 449 | } |
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| 450 | while ( (bytes_rcvd > 0) && (bytes_sent > 0) ); |
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| 451 | |
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| 452 | if ( (bytes_rcvd < 0) && (errno != ECONNRESET) ) |
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| 453 | syslog (LOG_ERR, "recv(): %m"), exit (EXIT_FAILURE); |
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| 454 | |
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| 455 | if ( (bytes_sent < 0) && (errno != EPIPE) ) |
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| 456 | syslog (LOG_ERR, "send(): %m"), exit (EXIT_FAILURE); |
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| 457 | |
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| 458 | if ( user->jabber && !user->keep_alive ) |
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| 459 | { |
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| 460 | shutdown(user->jabber, SHUT_RDWR); |
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| 461 | close(user->jabber); |
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| 462 | } |
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| 463 | pthread_exit(0); |
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| 464 | free (buf); |
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| 465 | } |
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| 466 | |
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| 467 | // NameToAddress() |
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| 468 | // Convert name to an ip address. |
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| 469 | // Returns 0 on success, -1 on failure. |
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| 470 | int NameToAddr (const char * name, struct in_addr * p_inaddr) |
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| 471 | { |
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| 472 | struct hostent * he; |
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| 473 | |
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| 474 | // First, attempt to convert from string ip format |
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| 475 | // TODO: use inet_aton() instead |
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| 476 | p_inaddr->s_addr = inet_addr (name); |
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| 477 | if ( p_inaddr->s_addr != -1U ) // Success |
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| 478 | return 0; |
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| 479 | |
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| 480 | // Next, attempt to read from /etc/hosts or do a DNS lookup |
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| 481 | he = gethostbyname (name); |
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| 482 | if ( he != NULL ) // Success |
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| 483 | { |
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| 484 | memcpy (p_inaddr, he->h_addr, sizeof (struct in_addr)); |
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| 485 | return 0; |
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| 486 | } |
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| 487 | |
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| 488 | return -1; // Failed to resolve name to an ip address |
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| 489 | } |
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| 490 | |
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| 491 | // NameToPort() |
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| 492 | // Convert name to a port number. Name can either be a port name |
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| 493 | // (in which case proto must also be set to either "tcp" or "udp") |
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| 494 | // or name can be the ascii representation of the port number. |
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| 495 | // Returns 0 on success, -1 on failure. |
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| 496 | int NameToPort (const char * name, unsigned short * port, const char * proto) |
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| 497 | { |
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| 498 | unsigned long lport; |
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| 499 | char * errpos; |
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| 500 | struct servent * se; |
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| 501 | |
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| 502 | // First, attempt to convert string to integer |
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| 503 | lport = strtoul (name, &errpos, 0); |
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| 504 | if ( (*errpos == 0) && (lport <= 65535) ) // Success |
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| 505 | { |
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| 506 | *port = lport; |
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| 507 | return 0; |
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| 508 | } |
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| 509 | |
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| 510 | // Next, attempt to read the string from /etc/services |
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| 511 | se = getservbyname (name, proto); |
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| 512 | if ( se != NULL) // Success |
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| 513 | { |
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| 514 | *port = ntohs (se->s_port); |
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| 515 | return 0; |
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| 516 | } |
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| 517 | |
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| 518 | return -1; // Failed to resolve port name to a number |
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| 519 | } |
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| 520 | |
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| 521 | // quit() |
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| 522 | // Print an error message to stderr |
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| 523 | // and syslog, then exit the program. |
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| 524 | void quit (const char * fmt, ...) // quit with msg |
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| 525 | { |
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| 526 | va_list ap; |
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| 527 | |
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| 528 | fflush (stdout); |
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| 529 | |
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| 530 | fprintf (stderr, "%s: ", g_program_name); |
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| 531 | |
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| 532 | va_start (ap, fmt); |
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| 533 | vfprintf (stderr, fmt, ap); |
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| 534 | va_end (ap); |
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| 535 | |
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| 536 | fputc ('\n', stderr); |
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| 537 | |
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| 538 | syslog (LOG_ERR, "I quit!"); |
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| 539 | |
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| 540 | exit (EXIT_FAILURE); |
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| 541 | } |
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| 542 | |
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| 543 | // pbomb() |
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| 544 | // Print an error message to stderr |
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| 545 | // and syslog, then exit the program. |
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| 546 | // pbomb() additionally include the |
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| 547 | // string representation of errno. |
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| 548 | void pbomb (const char * fmt, ...) // bomb with perror |
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| 549 | { |
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| 550 | va_list ap; |
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| 551 | int errno_save = errno; |
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| 552 | char buf[100]; |
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| 553 | |
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| 554 | fflush (stdout); |
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| 555 | |
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| 556 | fprintf (stderr, "%s: ", g_program_name); |
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| 557 | |
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| 558 | va_start (ap, fmt); |
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| 559 | vsnprintf (buf, sizeof (buf), fmt, ap); |
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| 560 | va_end (ap); |
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| 561 | |
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| 562 | errno = errno_save; |
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| 563 | perror (buf); |
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| 564 | |
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| 565 | syslog (LOG_ERR, "Bang!: %s: %m", buf); |
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| 566 | |
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| 567 | exit (EXIT_FAILURE); |
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| 568 | } |
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| 569 | |
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| 570 | // hbomb() |
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| 571 | // Print an error message to stderr |
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| 572 | // and syslog, then exit the program. |
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| 573 | // hbomb() additionally include the |
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| 574 | // string representation of h_errno. |
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| 575 | void hbomb (const char * fmt, ...) // bomb with herror |
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| 576 | { |
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| 577 | va_list ap; |
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| 578 | int h_errno_save = h_errno; |
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| 579 | char buf[100]; |
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| 580 | |
---|
| 581 | fflush (stdout); |
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| 582 | |
---|
| 583 | fprintf (stderr, "%s: ", g_program_name); |
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| 584 | |
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| 585 | va_start (ap, fmt); |
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| 586 | vsnprintf (buf, sizeof (buf), fmt, ap); |
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| 587 | va_end (ap); |
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| 588 | |
---|
| 589 | h_errno = h_errno_save; |
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| 590 | herror (buf); |
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| 591 | |
---|
| 592 | syslog (LOG_ERR, "Bang!: %s: %s", buf, hstrerror (h_errno)); |
---|
| 593 | |
---|
| 594 | exit (EXIT_FAILURE); |
---|
| 595 | } |
---|
| 596 | |
---|
| 597 | // set_signal_handler() |
---|
| 598 | // Sets a signal handler function. |
---|
| 599 | // Similar to signal() but this method |
---|
| 600 | // is more portable between platforms. |
---|
| 601 | void set_signal_handler (int signum, signal_handler_t sa_handler_func) |
---|
| 602 | { |
---|
| 603 | struct sigaction act; |
---|
| 604 | |
---|
| 605 | act.sa_handler = sa_handler_func; |
---|
| 606 | sigemptyset (&(act.sa_mask)); |
---|
| 607 | act.sa_flags = 0; |
---|
| 608 | |
---|
| 609 | if ( sigaction (signum, &act, NULL) < 0 ) |
---|
| 610 | { |
---|
| 611 | syslog (LOG_ERR, "Error setting handler for signal %d: %m", signum); |
---|
| 612 | exit (EXIT_FAILURE); |
---|
| 613 | } |
---|
| 614 | } |
---|