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 | #include <pthread.h> |
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21 | #include <ctype.h> |
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22 | |
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23 | |
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24 | // Buffer size, in bytes, used for copying in the Cat() function. |
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25 | const size_t BUF_SIZE = 4096; |
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26 | |
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27 | // Global variables |
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28 | char g_program_name[100]; // Initialised from argv[0] in ParseArgs() |
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29 | |
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30 | // Typedef for a signal handler function. |
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31 | typedef void (* signal_handler_t) (int); |
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32 | |
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33 | // Prototypes for functions in this file. |
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34 | void ParseArgs (int, char **, struct in_addr *, struct in_addr *, struct in_addr *, struct in_addr *); |
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35 | void Initialise (void); |
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36 | void sig_child (int); |
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37 | int CreateServerSocket (int); |
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38 | void Daemonise (void); |
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39 | void MainLoop (int);//, struct in_addr *, struct in_addr *, struct in_addr *, struct in_addr *); |
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40 | void ClearList(void); |
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41 | void Proxy (int, int); |
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42 | struct accept * AcceptClientConnection (int); |
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43 | void VerifyClient(void *); |
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44 | struct client * Handshake(int); |
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45 | int ConnectToServer (struct in_addr, unsigned short); |
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46 | //void Cat (int, int); |
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47 | void Cat (void *); |
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48 | int NameToAddr (const char *, struct in_addr *); |
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49 | int NameToPort (const char *, unsigned short *, const char *); |
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50 | #ifdef __GNUC__ |
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51 | void quit (const char *, ...) __attribute__ ((format (printf, 1, 2))); |
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52 | void pbomb (const char *, ...) __attribute__ ((format (printf, 1, 2))); |
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53 | void hbomb (const char *, ...) __attribute__ ((format (printf, 1, 2))); |
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54 | #else |
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55 | void quit (const char *, ...); |
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56 | void pbomb (const char *, ...); |
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57 | void hbomb (const char *, ...); |
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58 | #endif |
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59 | void set_signal_handler (int, signal_handler_t); |
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60 | |
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61 | #define __PORT__ 9000 |
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62 | #define __MOITA_FOI_SOLICITADA__ "moita" |
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63 | #define __OK__ "ok" |
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64 | |
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65 | struct accept |
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66 | { |
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67 | int newfd; |
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68 | struct sockaddr_in sa; |
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69 | }; |
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70 | |
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71 | struct main_loop |
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72 | { |
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73 | int listen_fd, |
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74 | ra_1, |
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75 | ra_2, |
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76 | ra_3, |
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77 | ra_4; |
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78 | }; |
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79 | |
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80 | struct client |
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81 | { |
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82 | char * user; |
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83 | int client_fd; |
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84 | int jabber_fd; |
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85 | int keep_alive; |
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86 | time_t last_action; |
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87 | struct client * next; |
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88 | struct client * previous; |
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89 | }; |
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90 | |
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91 | struct cat |
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92 | { |
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93 | int in_fd, |
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94 | out_fd; |
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95 | int jabber, |
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96 | keep_alive; |
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97 | struct client * client; |
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98 | }; |
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99 | |
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100 | struct client * clients = (struct client *)NULL; |
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101 | |
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102 | pthread_mutex_t mutexsum; |
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103 | |
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104 | int main (int argc, char ** argv) |
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105 | { |
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106 | struct in_addr remote_addr_1, |
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107 | remote_addr_2, |
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108 | remote_addr_3, |
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109 | remote_addr_4; |
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110 | int listen_fd_1, |
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111 | listen_fd_2, |
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112 | listen_fd_3, |
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113 | listen_fd_4, |
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114 | listen_fd_5; |
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115 | |
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116 | pthread_t port_9001, |
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117 | port_9002, |
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118 | port_9003, |
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119 | port_9004, |
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120 | port_9005; |
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121 | |
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122 | //ParseArgs (argc, argv, &remote_addr_1, &remote_addr_2, &remote_addr_3, &remote_addr_4); |
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123 | |
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124 | // Create server socket before becoming a daemon so |
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125 | // there is still a chance to print an error message. |
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126 | listen_fd_1 = CreateServerSocket (9001); |
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127 | listen_fd_2 = CreateServerSocket (9002); |
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128 | listen_fd_3 = CreateServerSocket (9003); |
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129 | listen_fd_4 = CreateServerSocket (9004); |
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130 | listen_fd_5 = CreateServerSocket (9005); |
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131 | |
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132 | if ( listen_fd_1 < 0 ) |
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133 | pbomb ("Unable to create server socket #1"); |
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134 | |
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135 | if ( listen_fd_2 < 0 ) |
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136 | pbomb ("Unable to create server socket #2"); |
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137 | |
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138 | if ( listen_fd_3 < 0 ) |
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139 | pbomb ("Unable to create server socket #3"); |
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140 | |
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141 | if ( listen_fd_4 < 0 ) |
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142 | pbomb ("Unable to create server socket #4"); |
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143 | |
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144 | if ( listen_fd_5 < 0 ) |
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145 | pbomb ("Unable to create server socket #5"); |
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146 | |
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147 | //Daemonise (); |
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148 | |
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149 | //pthread_create(&port_900, NULL, (void *) &MainLoop, (void *) accept); |
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150 | MainLoop (listen_fd_1);//, &remote_addr_1, &remote_addr_2, &remote_addr_3, &remote_addr_4); // never returns |
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151 | //MainLoop (listen_fd, &remote_addr_1, &remote_addr_2, &remote_addr_3, &remote_addr_4); // never returns |
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152 | //MainLoop (listen_fd, &remote_addr_1, &remote_addr_2, &remote_addr_3, &remote_addr_4); // never returns |
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153 | //MainLoop (listen_fd, &remote_addr_1, &remote_addr_2, &remote_addr_3, &remote_addr_4); // never returns |
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154 | //MainLoop (listen_fd, &remote_addr_1, &remote_addr_2, &remote_addr_3, &remote_addr_4); // never returns |
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155 | |
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156 | syslog (LOG_ERR, "fim MainLoop(): %m"); |
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157 | exit (EXIT_SUCCESS); |
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158 | } |
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159 | |
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160 | // ParseArgs() |
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161 | // Parse the command line arguments to extract the remote |
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162 | // and local adresses and port numbers, ra, rp, la & lp. |
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163 | // Exit the program gracefully upon error. |
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164 | void ParseArgs (int argc, char ** argv, struct in_addr * ra_1, struct in_addr * ra_2, struct in_addr * ra_3, struct in_addr * ra_4) |
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165 | { |
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166 | // argv[0] = program name |
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167 | // argv[1] = remote_addr |
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168 | // argv[2] = remote_port |
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169 | // argv[3] = local_addr (optional) |
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170 | // argv[4] = local_port (optional) |
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171 | |
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172 | char * p = strrchr (argv[0], '/'); |
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173 | |
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174 | strncpy (g_program_name, (p == NULL) ? argv[0] : p + 1, sizeof (g_program_name) - 1); |
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175 | |
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176 | if ( (argc < 5) || (argc > 5) ) |
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177 | { |
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178 | fprintf (stderr, "usage: %s remote_addr_1 remote_addr_2 remote_addr_3 remote_addr_4\n", argv[0]); |
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179 | exit (EXIT_FAILURE); |
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180 | } |
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181 | |
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182 | if ( NameToAddr (argv[1], ra_1) ) |
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183 | hbomb ("Unable to resolve \"%s\" to an ip address", argv[1]); |
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184 | |
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185 | if ( NameToAddr (argv[2], ra_2) ) |
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186 | hbomb ("Unable to resolve \"%s\" to an ip address", argv[2]); |
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187 | |
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188 | if ( NameToAddr (argv[3], ra_3) ) |
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189 | hbomb ("Unable to resolve \"%s\" to an ip address", argv[3]); |
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190 | |
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191 | if ( NameToAddr (argv[4], ra_4) ) |
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192 | hbomb ("Unable to resolve \"%s\" to an ip address", argv[4]); |
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193 | } |
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194 | |
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195 | // Initialise() |
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196 | // Setup syslog, signal handlers, and other intialisation. |
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197 | void Initialise (void) |
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198 | { |
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199 | openlog (g_program_name, LOG_PID, LOG_USER); |
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200 | syslog (LOG_INFO, "%s started", g_program_name); |
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201 | |
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202 | chdir ("/"); // Change working directory to the root. |
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203 | |
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204 | umask (0); // Clear our file mode creation mask |
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205 | |
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206 | //set_signal_handler (SIGCHLD, sig_child); |
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207 | |
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208 | //signal (SIGPIPE, SIG_IGN); |
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209 | } |
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210 | |
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211 | // CreateServerSocket() |
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212 | // Create a socket, bind it to the specified address |
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213 | // and port, and set it to listen for client connections. |
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214 | // Returns < 0 on failure to bind, bombs on error otherwise, |
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215 | // returns the fd of the new socket on success. |
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216 | int CreateServerSocket (int port) |
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217 | { |
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218 | int err, |
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219 | fd; |
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220 | const int on = 1; |
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221 | struct sockaddr_in sa; |
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222 | |
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223 | // Create a socket and get its descriptor. |
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224 | fd = socket (AF_INET, SOCK_STREAM, 0); |
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225 | if ( fd < 0 ) |
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226 | syslog (LOG_ERR, "socket(): %m"), exit (EXIT_FAILURE); |
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227 | |
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228 | // Set SO_REUSEADDR socket option |
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229 | if ( setsockopt (fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof (on)) < 0 ) |
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230 | syslog (LOG_ERR, "setsockopt(fd%d, SO_REUSEADDR): %m", fd); |
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231 | |
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232 | // Load a sa structure with the specified address and port |
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233 | sa.sin_family = AF_INET; |
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234 | sa.sin_addr.s_addr = htonl(INADDR_ANY); |
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235 | sa.sin_port = htons (port); |
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236 | memset (sa.sin_zero, 0, sizeof (sa.sin_zero)); |
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237 | |
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238 | // Bind our socket to the address and port specified |
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239 | err = bind (fd, (struct sockaddr *) &sa, sizeof (sa)); |
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240 | if ( err < 0 ) |
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241 | { |
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242 | syslog (LOG_ERR, "bind(): %m"); |
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243 | return err; |
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244 | } |
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245 | |
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246 | // Tell socket to listen and queue up to 5 incoming connections. |
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247 | if ( listen (fd, 5) < 0 ) |
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248 | syslog (LOG_ERR, "listen(): %m"), exit (EXIT_FAILURE); |
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249 | |
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250 | return fd; |
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251 | } |
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252 | |
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253 | // MainLoop() |
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254 | // Classic concurrent server model. |
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255 | // Wait for a client to connect, fork a child process |
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256 | // to do the business with the client, parent process |
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257 | // continues to wait for the next connection. |
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258 | // This function does not return. |
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259 | void MainLoop (int listen_fd) |
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260 | { |
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261 | struct accept * client; |
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262 | unsigned int addr = 0; |
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263 | char buf[250]; |
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264 | |
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265 | int bytes_rcvd, |
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266 | bytes_sent, |
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267 | usando_moita = 0, |
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268 | size_of_buffer, |
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269 | i; |
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270 | |
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271 | time_t inicio = time(NULL); |
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272 | |
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273 | for ( ; ; ) |
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274 | { |
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275 | client = AcceptClientConnection (listen_fd); |
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276 | addr = ntohl(client->sa.sin_addr.s_addr); |
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277 | |
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278 | sprintf(buf,"%d.%d.%d.%d", |
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279 | (addr >> 24) , (addr >> 16) & 0xFF , |
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280 | (addr >> 8) & 0xFF , addr & 0xFF); |
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281 | |
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282 | printf("New connection: %s :: %d\n", buf, ntohs(client->sa.sin_port)); |
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283 | |
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284 | bzero(buf, 250); |
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285 | |
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286 | if ( (bytes_rcvd = recv(client->newfd, buf, 128, 0)) < 1 ) |
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287 | printf("error in recv #1\n"); |
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288 | else |
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289 | { |
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290 | if ( strcmp(buf, __MOITA_FOI_SOLICITADA__) == 0 ) |
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291 | if ( !usando_moita ) |
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292 | { |
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293 | bzero(buf, 250); |
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294 | sprintf(buf, __OK__); |
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295 | size_of_buffer = sizeof(buf); |
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296 | for ( i = 0; i < size_of_buffer; i += bytes_sent ) |
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297 | { |
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298 | bytes_sent = send (client->newfd, buf + i, sizeof(buf) - i, 0); |
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299 | |
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300 | if ( bytes_sent < 0 ) |
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301 | break; |
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302 | } |
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303 | } |
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304 | } |
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305 | } |
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306 | } |
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307 | |
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308 | // AcceptClientConnection() |
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309 | // waits for a tcp connect to the socket listen_fd, which |
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310 | // must already be bound and set to listen on a local port. |
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311 | // Bombs on error, returns the fd of the new socket on success. |
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312 | struct accept * AcceptClientConnection (int listen_fd) |
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313 | { |
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314 | int newfd; |
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315 | struct sockaddr_in sa; |
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316 | socklen_t socklen; |
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317 | |
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318 | syslog (LOG_INFO, "AcceptClientConnection(fd%d)", listen_fd); |
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319 | |
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320 | // Accept the connection and create a new socket for it. |
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321 | socklen = sizeof (sa); |
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322 | memset (&sa, 0, socklen); |
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323 | do |
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324 | { |
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325 | newfd = accept (listen_fd, (struct sockaddr *) &sa, &socklen); |
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326 | } |
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327 | while ( (newfd < 0) && (errno == EINTR) ); |
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328 | |
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329 | syslog (LOG_INFO, "Accepted client connection on new socket fd%d", newfd); |
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330 | |
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331 | if ( newfd < 0 ) |
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332 | syslog (LOG_ERR, "accept(): %m"), pthread_exit(0); |
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333 | |
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334 | if ( socklen != sizeof (sa) ) |
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335 | syslog (LOG_ERR, "accept() screwed up!"), pthread_exit(0); |
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336 | |
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337 | struct accept * new_accept = (struct accept *) malloc(sizeof(struct accept)); |
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338 | new_accept->newfd = newfd; |
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339 | new_accept->sa = sa; |
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340 | |
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341 | return (new_accept); |
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342 | } |
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343 | |
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344 | void VerifyClient(void * accept) |
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345 | { |
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346 | int jabber_fd = (int)NULL; |
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347 | struct accept * client = (struct accept *) accept; |
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348 | struct client * user = (struct client *)NULL; |
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349 | struct cat * info; |
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350 | pthread_t cat_thread; |
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351 | |
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352 | unsigned int addr = 0; |
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353 | char buf[250]; |
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354 | addr = ntohl(client->sa.sin_addr.s_addr); |
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355 | sprintf(buf,"%d.%d.%d.%d", |
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356 | (addr >> 24) , (addr >> 16) & 0xFF , |
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357 | (addr >> 8) & 0xFF , addr & 0xFF); |
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358 | //printf("New connection: %s\n", buf); |
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359 | |
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360 | //if ( strcmp(buf, "10.15.20.42") == 0 )//|| strcmp(buf, "10.15.20.202") == 0 ) |
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361 | //{ |
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362 | // user = Handshake(client->newfd); |
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363 | // jabber_fd = user->jabber_fd; |
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364 | //} |
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365 | |
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366 | if ( jabber_fd == (int)NULL ) |
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367 | { |
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368 | //jabber_fd = ConnectToServer(client->jabber_addr, client->jabber_port); |
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369 | |
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370 | if ( user != (struct client *)NULL ) |
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371 | user->jabber_fd = jabber_fd; |
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372 | } |
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373 | |
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374 | info = (struct cat *) malloc(sizeof(struct cat)); |
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375 | |
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376 | info->out_fd = jabber_fd; |
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377 | info->in_fd = client->newfd; |
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378 | info->jabber = (int)NULL; |
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379 | info->keep_alive = (int)NULL; |
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380 | info->client = user; |
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381 | |
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382 | pthread_create(&cat_thread, NULL, (void *) &Cat, (void *)info ); |
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383 | |
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384 | pthread_exit(0); |
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385 | } |
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386 | |
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387 | struct client * Handshake(int newfd) |
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388 | { |
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389 | float is_new_client;// = (float) NULL; |
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390 | int bytes_rcvd, |
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391 | bytes_sent, |
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392 | i; |
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393 | |
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394 | unsigned char * const buf = (char *) malloc (sizeof(char) * 5); |
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395 | char * user = (char *) malloc(128 * sizeof(char)), |
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396 | * pass = (char *) malloc(128 * sizeof(char)); |
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397 | |
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398 | //struct client * clients = (struct client *)NULL; |
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399 | struct client * new_client = (struct client *)NULL; |
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400 | |
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401 | bzero(buf, 5); |
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402 | sprintf(buf, "user"); |
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403 | for ( i = 0; i < sizeof(buf); i += bytes_sent ) |
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404 | { |
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405 | bytes_sent = send (newfd, buf + i, sizeof(buf) - i, 0); |
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406 | |
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407 | if ( bytes_sent < 0 ) |
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408 | break; |
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409 | } |
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410 | |
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411 | bzero(user, 128); |
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412 | if ( (bytes_rcvd = recv (newfd, user, 128, 0)) < 1 ) |
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413 | pthread_exit(0); |
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414 | |
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415 | bzero(buf, 5); |
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416 | sprintf(buf, "pass"); |
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417 | for ( i = 0; i < sizeof(buf); i += bytes_sent ) |
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418 | { |
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419 | bytes_sent = send (newfd, buf + i, sizeof(buf) - i, 0); |
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420 | |
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421 | if ( bytes_sent < 0 ) |
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422 | break; |
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423 | } |
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424 | |
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425 | bzero(pass, 128); |
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426 | if ( (bytes_rcvd = recv (newfd, pass, 128, 0)) < 1 ) |
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427 | pthread_exit(0); |
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428 | |
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429 | pthread_mutex_lock (&mutexsum); |
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430 | if ( clients == (struct client *)NULL ) |
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431 | { |
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432 | clients = (struct client *) malloc(sizeof(struct client)); |
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433 | |
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434 | new_client = clients; |
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435 | new_client->previous = (struct client *)NULL; |
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436 | is_new_client = 1; |
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437 | } |
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438 | else |
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439 | { |
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440 | new_client = clients; |
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441 | while ( ((is_new_client = (float)strcmp(new_client->user, user)) != 0) && (new_client->next != (struct client *)NULL) ) |
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442 | new_client = new_client->next; |
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443 | |
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444 | if ( is_new_client != 0 ) |
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445 | { |
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446 | new_client->next = (struct client *) malloc(sizeof(struct client)); |
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447 | new_client->next->previous = new_client; |
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448 | new_client = new_client->next; |
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449 | } |
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450 | } |
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451 | |
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452 | if ( is_new_client != 0 ) |
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453 | { |
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454 | new_client->user = user; |
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455 | new_client->jabber_fd = (int)NULL; |
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456 | new_client->keep_alive = 1; |
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457 | new_client->next = (struct client *)NULL; |
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458 | } |
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459 | |
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460 | bzero(buf, 5); |
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461 | if ( is_new_client != 0 || new_client->jabber_fd == (int)NULL ) |
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462 | sprintf(buf, "new"); |
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463 | else |
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464 | sprintf(buf, "rec"); |
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465 | |
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466 | send (newfd, buf, 3, 0); |
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467 | |
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468 | new_client->client_fd = newfd; |
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469 | new_client->last_action = time(NULL); |
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470 | pthread_mutex_unlock(&mutexsum); |
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471 | |
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472 | return new_client; |
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473 | } |
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474 | |
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475 | // ConnectToServer() |
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476 | // attempts a tcp connect to the server specified |
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477 | // by addr and port. Bombs on failure to connect, |
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478 | // returns the fd of the new socket on success. |
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479 | int ConnectToServer (struct in_addr addr, unsigned short port) |
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480 | { |
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481 | // TODO: have a timeout for connect() - see Unix socket FAQ 6.2 |
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482 | |
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483 | int fd, err; |
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484 | struct sockaddr_in sa; |
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485 | |
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486 | // Create a socket and get its descriptor. |
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487 | fd = socket (AF_INET, SOCK_STREAM, 0); |
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488 | |
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489 | if ( fd < 0 ) |
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490 | syslog (LOG_ERR, "socket(): %m"), pthread_exit(0);//exit (EXIT_FAILURE); |
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491 | |
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492 | sa.sin_family = AF_INET; |
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493 | sa.sin_port = htons (port); |
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494 | sa.sin_addr = addr; |
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495 | memset (sa.sin_zero, 0, sizeof (sa.sin_zero)); |
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496 | |
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497 | err = connect (fd, (struct sockaddr *) &sa, sizeof (sa)); |
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498 | if (err < 0) |
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499 | { |
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500 | syslog (LOG_ERR, "Unable to connect socket fd%d to server: %m", fd); |
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501 | //exit (EXIT_FAILURE); |
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502 | pthread_exit(0); |
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503 | } |
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504 | |
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505 | syslog (LOG_INFO, "Connected socket fd%d to server", fd); |
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506 | |
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507 | return fd; |
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508 | } |
---|
509 | |
---|
510 | // Cat() |
---|
511 | // read data from in_fd and write it to out_fd until |
---|
512 | // the connection is closed by one of the peers. |
---|
513 | // Data is copied using a dynamically allocated buffer. |
---|
514 | //void Cat (int in_fd, int out_fd) |
---|
515 | //void Cat (int in_fd, int out_fd) |
---|
516 | void Cat (void * info) |
---|
517 | { |
---|
518 | unsigned char * const buf_in = (char *) malloc (sizeof(char) * BUF_SIZE); |
---|
519 | unsigned char * const buf_out = (char *) malloc (sizeof(char) * BUF_SIZE); |
---|
520 | int bytes_rcvd_in = (int) NULL, |
---|
521 | bytes_sent_in = (int) NULL, |
---|
522 | bytes_rcvd_out = (int) NULL, |
---|
523 | bytes_sent_out = (int) NULL, |
---|
524 | i, |
---|
525 | in_fd, |
---|
526 | out_fd; |
---|
527 | struct cat * user = (struct cat *) info; |
---|
528 | in_fd = user->in_fd; |
---|
529 | out_fd = user->out_fd; |
---|
530 | |
---|
531 | syslog (LOG_INFO, "Cat(fd%d, fd%d)", in_fd, out_fd); |
---|
532 | |
---|
533 | if ( buf_in == NULL || buf_out == NULL ) |
---|
534 | syslog (LOG_ERR, "malloc(): %m"), pthread_exit(0); |
---|
535 | |
---|
536 | fcntl(in_fd, F_SETFL, fcntl(in_fd, F_GETFL, 0) | O_NDELAY); |
---|
537 | fcntl(out_fd, F_SETFL, fcntl(out_fd, F_GETFL, 0) | O_NDELAY); |
---|
538 | |
---|
539 | bzero(buf_in, BUF_SIZE); |
---|
540 | bzero(buf_out, BUF_SIZE); |
---|
541 | do |
---|
542 | { |
---|
543 | bzero(buf_in, BUF_SIZE); |
---|
544 | if ( (bytes_rcvd_in = recv (in_fd, buf_in, BUF_SIZE, 0)) != 0 && strlen(buf_out) > 0 ) |
---|
545 | { |
---|
546 | for ( i = 0; i < bytes_rcvd_out; i += bytes_sent_in ) |
---|
547 | { |
---|
548 | bytes_sent_in = send (in_fd, buf_out + i, bytes_rcvd_out - i, 0); |
---|
549 | |
---|
550 | if ( bytes_sent_in < 0 ) |
---|
551 | break; |
---|
552 | } |
---|
553 | } |
---|
554 | |
---|
555 | bzero(buf_out, BUF_SIZE); |
---|
556 | if ( (bytes_rcvd_out = recv (out_fd, buf_out, BUF_SIZE, 0)) != 0 && strlen(buf_in) > 0 ) |
---|
557 | { |
---|
558 | //printf("\n%s\n", buf_in); |
---|
559 | for ( i = 0; i < bytes_rcvd_in; i += bytes_sent_out ) |
---|
560 | { |
---|
561 | bytes_sent_out = send (out_fd, buf_in + i, bytes_rcvd_in - i, 0); |
---|
562 | |
---|
563 | if ( bytes_sent_out < 0 ) |
---|
564 | break; |
---|
565 | } |
---|
566 | } |
---|
567 | usleep(500); |
---|
568 | } |
---|
569 | while ( (bytes_rcvd_in != 0) && (bytes_rcvd_out != 0) ); |
---|
570 | |
---|
571 | if ( ((bytes_rcvd_in < 0) || (bytes_rcvd_out < 0)) && (errno != ECONNRESET) ) |
---|
572 | syslog (LOG_ERR, "recv(): %m"), pthread_exit(0); |
---|
573 | |
---|
574 | if ( ((bytes_sent_in < 0) || (bytes_sent_out < 0)) && (errno != EPIPE) ) |
---|
575 | syslog (LOG_ERR, "send(): %m"), pthread_exit(0); |
---|
576 | |
---|
577 | if ( user->jabber && !user->keep_alive ) |
---|
578 | { |
---|
579 | shutdown(user->jabber, SHUT_RDWR); |
---|
580 | close(user->jabber); |
---|
581 | } |
---|
582 | pthread_exit(0); |
---|
583 | free (buf_in); |
---|
584 | free (buf_out); |
---|
585 | } |
---|
586 | |
---|
587 | // NameToAddress() |
---|
588 | // Convert name to an ip address. |
---|
589 | // Returns 0 on success, -1 on failure. |
---|
590 | int NameToAddr (const char * name, struct in_addr * p_inaddr) |
---|
591 | { |
---|
592 | struct hostent * he; |
---|
593 | |
---|
594 | // First, attempt to convert from string ip format |
---|
595 | // TODO: use inet_aton() instead |
---|
596 | p_inaddr->s_addr = inet_addr (name); |
---|
597 | if ( p_inaddr->s_addr != -1U ) // Success |
---|
598 | return 0; |
---|
599 | |
---|
600 | // Next, attempt to read from /etc/hosts or do a DNS lookup |
---|
601 | he = gethostbyname (name); |
---|
602 | if ( he != NULL ) // Success |
---|
603 | { |
---|
604 | memcpy (p_inaddr, he->h_addr, sizeof (struct in_addr)); |
---|
605 | return 0; |
---|
606 | } |
---|
607 | |
---|
608 | return -1; // Failed to resolve name to an ip address |
---|
609 | } |
---|
610 | |
---|
611 | // NameToPort() |
---|
612 | // Convert name to a port number. Name can either be a port name |
---|
613 | // (in which case proto must also be set to either "tcp" or "udp") |
---|
614 | // or name can be the ascii representation of the port number. |
---|
615 | // Returns 0 on success, -1 on failure. |
---|
616 | int NameToPort (const char * name, unsigned short * port, const char * proto) |
---|
617 | { |
---|
618 | unsigned long lport; |
---|
619 | char * errpos; |
---|
620 | struct servent * se; |
---|
621 | |
---|
622 | // First, attempt to convert string to integer |
---|
623 | lport = strtoul (name, &errpos, 0); |
---|
624 | if ( (*errpos == 0) && (lport <= 65535) ) // Success |
---|
625 | { |
---|
626 | *port = lport; |
---|
627 | return 0; |
---|
628 | } |
---|
629 | |
---|
630 | // Next, attempt to read the string from /etc/services |
---|
631 | se = getservbyname (name, proto); |
---|
632 | if ( se != NULL) // Success |
---|
633 | { |
---|
634 | *port = ntohs (se->s_port); |
---|
635 | return 0; |
---|
636 | } |
---|
637 | |
---|
638 | return -1; // Failed to resolve port name to a number |
---|
639 | } |
---|
640 | |
---|
641 | // quit() |
---|
642 | // Print an error message to stderr |
---|
643 | // and syslog, then exit the program. |
---|
644 | void quit (const char * fmt, ...) // quit with msg |
---|
645 | { |
---|
646 | va_list ap; |
---|
647 | |
---|
648 | fflush (stdout); |
---|
649 | |
---|
650 | fprintf (stderr, "%s: ", g_program_name); |
---|
651 | |
---|
652 | va_start (ap, fmt); |
---|
653 | vfprintf (stderr, fmt, ap); |
---|
654 | va_end (ap); |
---|
655 | |
---|
656 | fputc ('\n', stderr); |
---|
657 | |
---|
658 | syslog (LOG_ERR, "I quit!"); |
---|
659 | |
---|
660 | exit (EXIT_FAILURE); |
---|
661 | } |
---|
662 | |
---|
663 | // pbomb() |
---|
664 | // Print an error message to stderr |
---|
665 | // and syslog, then exit the program. |
---|
666 | // pbomb() additionally include the |
---|
667 | // string representation of errno. |
---|
668 | void pbomb (const char * fmt, ...) // bomb with perror |
---|
669 | { |
---|
670 | va_list ap; |
---|
671 | int errno_save = errno; |
---|
672 | char buf[100]; |
---|
673 | |
---|
674 | fflush (stdout); |
---|
675 | |
---|
676 | fprintf (stderr, "%s: ", g_program_name); |
---|
677 | |
---|
678 | va_start (ap, fmt); |
---|
679 | vsnprintf (buf, sizeof (buf), fmt, ap); |
---|
680 | va_end (ap); |
---|
681 | |
---|
682 | errno = errno_save; |
---|
683 | perror (buf); |
---|
684 | |
---|
685 | syslog (LOG_ERR, "Bang!: %s: %m", buf); |
---|
686 | |
---|
687 | exit (EXIT_FAILURE); |
---|
688 | } |
---|
689 | |
---|
690 | // hbomb() |
---|
691 | // Print an error message to stderr |
---|
692 | // and syslog, then exit the program. |
---|
693 | // hbomb() additionally include the |
---|
694 | // string representation of h_errno. |
---|
695 | void hbomb (const char * fmt, ...) // bomb with herror |
---|
696 | { |
---|
697 | va_list ap; |
---|
698 | int h_errno_save = h_errno; |
---|
699 | char buf[100]; |
---|
700 | |
---|
701 | fflush (stdout); |
---|
702 | |
---|
703 | fprintf (stderr, "%s: ", g_program_name); |
---|
704 | |
---|
705 | va_start (ap, fmt); |
---|
706 | vsnprintf (buf, sizeof (buf), fmt, ap); |
---|
707 | va_end (ap); |
---|
708 | |
---|
709 | h_errno = h_errno_save; |
---|
710 | herror (buf); |
---|
711 | |
---|
712 | syslog (LOG_ERR, "Bang!: %s: %s", buf, hstrerror (h_errno)); |
---|
713 | |
---|
714 | exit (EXIT_FAILURE); |
---|
715 | } |
---|
716 | |
---|
717 | // set_signal_handler() |
---|
718 | // Sets a signal handler function. |
---|
719 | // Similar to signal() but this method |
---|
720 | // is more portable between platforms. |
---|
721 | void set_signal_handler (int signum, signal_handler_t sa_handler_func) |
---|
722 | { |
---|
723 | struct sigaction act; |
---|
724 | |
---|
725 | act.sa_handler = sa_handler_func; |
---|
726 | sigemptyset (&(act.sa_mask)); |
---|
727 | act.sa_flags = 0; |
---|
728 | |
---|
729 | if ( sigaction (signum, &act, NULL) < 0 ) |
---|
730 | { |
---|
731 | syslog (LOG_ERR, "Error setting handler for signal %d: %m", signum); |
---|
732 | exit (EXIT_FAILURE); |
---|
733 | } |
---|
734 | } |
---|