[165] | 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); |
---|
| 494 | pthread_exit(0); |
---|
| 495 | } |
---|
| 496 | |
---|
| 497 | bzero(buf, 5); |
---|
| 498 | sprintf(buf, "pass"); |
---|
| 499 | for ( i = 0; i < sizeof(buf); i += bytes_sent ) |
---|
| 500 | { |
---|
| 501 | bytes_sent = send (newfd, buf + i, sizeof(buf) - i, 0); |
---|
| 502 | |
---|
| 503 | if ( bytes_sent < 0 ) |
---|
| 504 | break; |
---|
| 505 | } |
---|
| 506 | |
---|
| 507 | bzero(pass, 128); |
---|
| 508 | if ( (bytes_rcvd = recv (newfd, pass, 128, 0)) < 1 ) |
---|
| 509 | { |
---|
| 510 | printf("PASS....: %s", pass); |
---|
| 511 | shutdown(newfd, SHUT_RDWR); |
---|
| 512 | close(newfd); |
---|
| 513 | pthread_exit(0); |
---|
| 514 | } |
---|
| 515 | |
---|
| 516 | bzero(buf, 5); |
---|
| 517 | sprintf(buf, "type"); |
---|
| 518 | for ( i = 0; i < sizeof(buf); i += bytes_sent ) |
---|
| 519 | { |
---|
| 520 | bytes_sent = send (newfd, buf + i, sizeof(buf) - i, 0); |
---|
| 521 | |
---|
| 522 | if ( bytes_sent < 0 ) |
---|
| 523 | break; |
---|
| 524 | } |
---|
| 525 | |
---|
| 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 | } |
---|