1 | //socket.c: |
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2 | |
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3 | #include "libroar.h" |
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4 | |
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5 | #define MODE_LISTEN ROAR_SOCKET_MODE_LISTEN |
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6 | #define MODE_CONNECT ROAR_SOCKET_MODE_CONNECT |
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7 | |
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8 | int roar_socket_new_tcp (void) { |
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9 | int fh; |
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10 | int opt = IPTOS_LOWDELAY; |
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11 | |
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12 | fh = socket(PF_INET, SOCK_STREAM, 0); |
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13 | |
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14 | setsockopt(fh, IPPROTO_IP, IP_TOS, &opt, sizeof(int)); |
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15 | |
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16 | return fh; |
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17 | } |
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18 | |
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19 | int roar_socket_new_udp (void) { |
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20 | int fh; |
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21 | int opt = IPTOS_LOWDELAY; |
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22 | |
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23 | fh = socket(PF_INET, SOCK_DGRAM, 0); |
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24 | |
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25 | setsockopt(fh, IPPROTO_IP, IP_TOS, &opt, sizeof(int)); |
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26 | |
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27 | return fh; |
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28 | } |
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29 | |
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30 | int roar_socket_new_tcp6 (void) { |
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31 | #ifdef PF_INET6 |
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32 | int fh; |
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33 | int opt = IPTOS_LOWDELAY; |
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34 | |
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35 | fh = socket(PF_INET6, SOCK_STREAM, 0); |
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36 | |
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37 | setsockopt(fh, IPPROTO_IP, IP_TOS, &opt, sizeof(int)); |
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38 | |
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39 | return fh; |
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40 | #else |
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41 | return -1; |
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42 | #endif |
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43 | } |
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44 | |
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45 | int roar_socket_new_udp6 (void) { |
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46 | #ifdef PF_INET6 |
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47 | int fh; |
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48 | int opt = IPTOS_LOWDELAY; |
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49 | |
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50 | fh = socket(PF_INET6, SOCK_DGRAM, 0); |
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51 | |
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52 | setsockopt(fh, IPPROTO_IP, IP_TOS, &opt, sizeof(int)); |
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53 | |
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54 | return fh; |
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55 | #else |
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56 | return -1; |
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57 | #endif |
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58 | } |
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59 | |
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60 | int roar_socket_new_unix (void) { |
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61 | int fh; |
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62 | #ifdef SO_PEERCRED |
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63 | int opt = 1; |
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64 | #endif |
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65 | |
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66 | fh = socket(AF_UNIX, SOCK_STREAM, 0); |
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67 | |
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68 | #ifdef SO_PEERCRED |
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69 | setsockopt(fh, SOL_SOCKET, SO_PASSCRED, &opt, sizeof(int)); |
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70 | #endif |
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71 | |
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72 | return fh; |
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73 | } |
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74 | |
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75 | int roar_socket_new_decnet_seqpacket (void) { |
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76 | #ifdef ROAR_HAVE_LIBDNET |
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77 | int fh; |
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78 | |
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79 | fh = socket(AF_DECnet, SOCK_SEQPACKET, DNPROTO_NSP); |
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80 | |
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81 | return fh; |
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82 | #else |
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83 | return -1; |
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84 | #endif |
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85 | } |
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86 | |
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87 | |
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88 | int roar_socket_new_decnet_stream (void) { |
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89 | #ifdef ROAR_HAVE_LIBDNET |
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90 | int fh; |
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91 | |
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92 | fh = socket(AF_DECnet, SOCK_STREAM, DNPROTO_NSP); |
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93 | |
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94 | return fh; |
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95 | #else |
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96 | return -1; |
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97 | #endif |
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98 | } |
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99 | |
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100 | int roar_socket_new_ipxspx (void) { |
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101 | return -1; |
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102 | } |
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103 | |
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104 | int roar_socket_nonblock(int fh, int state) { |
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105 | int flags; |
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106 | |
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107 | if ( (flags = fcntl(fh, F_GETFL, 0)) == -1 ) { |
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108 | ROAR_ERR("roar_socket_nonblock(fh=%i, state=%i): Can not read flags: %s", fh, state, strerror(errno)); |
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109 | ROAR_DBG("roar_socket_nonblock(fh=%i, state=%i) = -1", fh, state); |
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110 | return -1; |
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111 | } |
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112 | |
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113 | flags |= O_NONBLOCK; |
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114 | |
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115 | if ( state == ROAR_SOCKET_BLOCK ) |
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116 | flags -= O_NONBLOCK; |
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117 | |
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118 | if ( fcntl(fh, F_SETFL, flags) == -1 ) { |
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119 | ROAR_ERR("roar_socket_nonblock(fh=%i, state=%i): Can not set flags: %s", fh, state, strerror(errno)); |
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120 | ROAR_DBG("roar_socket_nonblock(fh=%i, state=%i) = -1", fh, state); |
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121 | return -1; |
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122 | } |
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123 | |
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124 | ROAR_DBG("roar_socket_nonblock(fh=%i, state=%i) = 0", fh, state); |
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125 | return 0; |
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126 | } |
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127 | |
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128 | int roar_socket_dup_udp_local_end (int fh) { |
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129 | int n = -1; |
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130 | int flags = -1; |
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131 | struct sockaddr_in socket_addr; |
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132 | socklen_t len = sizeof(struct sockaddr_in); |
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133 | |
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134 | if ( (flags = fcntl(fh, F_GETFL, 0)) == -1 ) { |
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135 | ROAR_WARN("roar_socket_dup_udp_local_end(fh=%i): Can not read flags: %s", fh, strerror(errno)); |
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136 | } |
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137 | |
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138 | if ( getsockname(fh, (struct sockaddr *)&socket_addr, &len) == -1 ) { |
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139 | return -1; |
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140 | } |
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141 | |
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142 | if ( socket_addr.sin_family != AF_INET ) { |
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143 | return -1; |
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144 | } |
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145 | |
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146 | n = roar_socket_new_udp(); |
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147 | |
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148 | if ( n == -1 ) |
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149 | return -1; |
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150 | |
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151 | // if ( mode_func(fh, (struct sockaddr *)&socket_addr, sizeof(struct sockaddr_in)) == -1 ) { |
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152 | if ( bind(n, (struct sockaddr *)&socket_addr, len) == -1 ) { |
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153 | close(n); |
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154 | return -1; |
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155 | } |
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156 | |
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157 | if ( flags != -1 ) { |
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158 | if ( fcntl(fh, F_SETFL, flags) == -1 ) { |
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159 | ROAR_WARN("roar_socket_dup_udp_local_end(fh=%i): Can not set flags: %s", fh, strerror(errno)); |
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160 | return -1; |
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161 | } |
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162 | } |
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163 | |
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164 | |
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165 | return n; |
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166 | } |
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167 | |
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168 | int roar_socket_listen (int type, char * host, int port) { |
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169 | return roar_socket_open(MODE_LISTEN, type, host, port); |
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170 | } |
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171 | |
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172 | int roar_socket_connect (char * host, int port) { |
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173 | char * proxy_type = getenv("ROAR_PROXY"); |
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174 | |
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175 | if ( proxy_type == NULL || strcmp(proxy_type, "") == 0 ) { |
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176 | return roar_socket_open(MODE_CONNECT, ROAR_SOCKET_TYPE_UNKNOWN, host, port); |
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177 | } else { |
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178 | return roar_socket_open_proxy(MODE_CONNECT, ROAR_SOCKET_TYPE_UNKNOWN, host, port, proxy_type); |
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179 | } |
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180 | } |
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181 | |
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182 | |
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183 | int roar_socket_listen_decnet (char * object, int num) { |
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184 | #ifdef ROAR_HAVE_LIBDNET |
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185 | int fh = roar_socket_new_decnet_stream(); |
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186 | struct sockaddr_dn bind_sockaddr; |
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187 | |
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188 | if ( fh == -1 ) |
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189 | return -1; |
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190 | |
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191 | if ( !*object ) |
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192 | object = NULL; |
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193 | |
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194 | if ( (object && num) || (!*object && !num) ) { |
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195 | ROAR_WARN("roar_socket_listen_decnet(object='%s', num=%i): illegal address!", object, num); |
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196 | close(fh); |
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197 | return -1; |
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198 | } |
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199 | |
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200 | memset((void*)&bind_sockaddr, 0, sizeof(struct sockaddr_dn)); |
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201 | |
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202 | bind_sockaddr.sdn_family = AF_DECnet; |
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203 | bind_sockaddr.sdn_flags = 0; |
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204 | bind_sockaddr.sdn_objnum = num; |
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205 | |
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206 | if ( num ) { |
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207 | bind_sockaddr.sdn_objnamel = 0; |
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208 | } else { |
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209 | bind_sockaddr.sdn_objnamel = ROAR_dn_htons(strlen(object)); |
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210 | strcpy((char*)bind_sockaddr.sdn_objname, object); // FIXME: shouldn't we use strncpy()? |
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211 | } |
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212 | |
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213 | if ( bind(fh, (struct sockaddr *) &bind_sockaddr, sizeof(bind_sockaddr)) == -1 ) { |
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214 | close(fh); |
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215 | return -1; |
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216 | } |
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217 | |
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218 | if ( listen(fh, 8) == -1 ) { |
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219 | close(fh); |
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220 | return -1; |
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221 | } |
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222 | |
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223 | return fh; |
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224 | #else |
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225 | return -1; |
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226 | #endif |
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227 | } |
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228 | |
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229 | char * roar_socket_get_local_nodename(void) { |
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230 | #ifdef ROAR_HAVE_LIBDNET |
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231 | static char node[16] = {0}; |
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232 | struct dn_naddr *binaddr; |
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233 | struct nodeent *dp; |
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234 | |
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235 | if ( !node[0] ) { |
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236 | if ( (binaddr=getnodeadd()) == NULL) |
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237 | return NULL; |
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238 | |
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239 | if ( (dp=getnodebyaddr((char*)binaddr->a_addr, binaddr->a_len, PF_DECnet)) == NULL ) |
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240 | return NULL; |
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241 | |
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242 | strncpy(node, dp->n_name, 15); |
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243 | node[15] = 0; |
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244 | } |
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245 | |
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246 | return node; |
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247 | #else |
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248 | return NULL; |
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249 | #endif |
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250 | } |
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251 | |
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252 | int roar_socket_open (int mode, int type, char * host, int port) { |
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253 | // int type = ROAR_SOCKET_TYPE_INET; |
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254 | int fh; |
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255 | union { |
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256 | struct sockaddr_in in; |
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257 | struct sockaddr_un un; |
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258 | struct sockaddr_in6 in6; |
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259 | } socket_addr; |
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260 | struct hostent * he; |
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261 | //unsigned int host_div = 0; |
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262 | int (*mode_func)(int sockfd, const struct sockaddr *serv_addr, socklen_t addrlen) = connect; // default is to connect |
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263 | #ifdef ROAR_HAVE_LIBDNET |
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264 | char obj[80]; |
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265 | char * del; |
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266 | #endif |
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267 | |
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268 | if ( mode == MODE_LISTEN ) |
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269 | mode_func = bind; |
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270 | |
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271 | if ( type == ROAR_SOCKET_TYPE_UNKNOWN ) { |
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272 | type = ROAR_SOCKET_TYPE_INET; |
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273 | if ( *host == '/' ) { |
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274 | type = ROAR_SOCKET_TYPE_UNIX; |
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275 | } else if ( strcmp(host, "+fork") == 0 ) { |
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276 | type = ROAR_SOCKET_TYPE_FORK; |
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277 | } else if ( strstr(host, "::") != NULL ) { |
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278 | type = ROAR_SOCKET_TYPE_DECNET; |
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279 | } |
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280 | } |
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281 | |
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282 | |
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283 | ROAR_DBG("roar_socket_open(*): type=%s, host='%s', port=%i", |
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284 | type == ROAR_SOCKET_TYPE_UNIX ? "UNIX" : "INET", host, port); |
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285 | |
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286 | if ( type == ROAR_SOCKET_TYPE_DECNET ) { |
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287 | #ifdef ROAR_HAVE_LIBDNET |
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288 | ROAR_DBG("roar_socket_open(*): hostname for DECnet: host(%p)=%s", host, host); |
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289 | del = strstr(host, "::"); |
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290 | ROAR_DBG("roar_socket_open(*): hostname for DECnet: del(%p)=%s", del, del); |
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291 | |
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292 | if ( del == NULL ) { |
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293 | ROAR_WARN("roar_socket_open(*): invalid hostname for DECnet: %s", host); |
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294 | return -1; |
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295 | } |
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296 | |
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297 | *del = 0; |
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298 | |
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299 | if ( *(del+2) == '#' ) { // assume we have node::#num |
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300 | port = atoi(del+2); |
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301 | } |
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302 | |
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303 | if ( port ) { |
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304 | sprintf(obj, "%i", port); // no need for snprintf() as dec(port) is smaller than obj[] |
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305 | } else { |
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306 | *obj = 0; |
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307 | strncat(obj, del+2, 79); |
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308 | } |
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309 | |
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310 | if ( mode == MODE_LISTEN ) { |
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311 | fh = roar_socket_listen_decnet(obj, port); |
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312 | *del = ':'; |
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313 | return fh; |
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314 | // return -1; // listen sockets on DECnet are not supportet at the moment |
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315 | } else { |
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316 | // There is nothing wrong in this case to use dnet_conn() so we do. |
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317 | fh = dnet_conn(host, obj, SOCK_STREAM, 0 ,0 ,0 , 0); |
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318 | *del = ':'; |
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319 | return fh; |
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320 | #else |
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321 | return -1; // no decnet support |
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322 | #endif |
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323 | } |
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324 | } |
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325 | |
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326 | memset(&socket_addr, 0, sizeof(socket_addr)); |
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327 | memset(&he, 0, sizeof(he)); // FIXME: we have a valid pointer in here???? |
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328 | |
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329 | |
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330 | if ( type == ROAR_SOCKET_TYPE_INET || type == ROAR_SOCKET_TYPE_INET6 ) { |
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331 | |
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332 | if ( (he = gethostbyname(host)) == NULL ) { |
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333 | ROAR_ERR("roar_socket_open(*): Can\'t resolve host name '%s'", |
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334 | host); |
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335 | return -1; |
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336 | } |
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337 | |
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338 | if ( he->h_addrtype == AF_INET ) { |
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339 | if ( type != ROAR_SOCKET_TYPE_INET ) |
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340 | return -1; |
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341 | |
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342 | memcpy((struct in_addr *)&socket_addr.in.sin_addr, he->h_addr, sizeof(struct in_addr)); |
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343 | |
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344 | /* set the connect information */ |
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345 | socket_addr.in.sin_family = AF_INET; |
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346 | socket_addr.in.sin_port = ROAR_HOST2NET16(port); |
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347 | |
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348 | fh = roar_socket_new_tcp(); |
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349 | |
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350 | if ( mode_func(fh, (struct sockaddr *)&socket_addr.in, sizeof(struct sockaddr_in)) == -1 ) { |
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351 | ROAR_DBG("roar_socket_open(*): Can not connect/bind: %s", strerror(errno)); |
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352 | close(fh); |
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353 | return -1; |
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354 | } |
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355 | } if ( he->h_addrtype == AF_INET6 ) { |
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356 | if ( type != ROAR_SOCKET_TYPE_INET6 ) |
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357 | return -1; |
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358 | |
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359 | memcpy((struct in6_addr *)&socket_addr.in6.sin6_addr, he->h_addr, sizeof(struct in6_addr)); |
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360 | |
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361 | /* set the connect information */ |
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362 | socket_addr.in6.sin6_family = AF_INET6; |
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363 | socket_addr.in6.sin6_port = ROAR_HOST2NET16(port); |
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364 | |
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365 | fh = roar_socket_new_tcp6(); |
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366 | |
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367 | if ( mode_func(fh, (struct sockaddr *)&socket_addr.in6, sizeof(struct sockaddr_in6)) == -1 ) { |
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368 | ROAR_DBG("roar_socket_open(*): Can not connect/bind: %s", strerror(errno)); |
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369 | close(fh); |
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370 | return -1; |
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371 | } |
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372 | } else { |
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373 | return -1; |
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374 | } |
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375 | // hey! we have a socket... |
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376 | } else if ( type == ROAR_SOCKET_TYPE_UNIX ) { |
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377 | socket_addr.un.sun_family = AF_UNIX; |
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378 | strncpy(socket_addr.un.sun_path, host, sizeof(socket_addr.un.sun_path) - 1); |
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379 | |
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380 | fh = roar_socket_new_unix(); |
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381 | |
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382 | if ( mode_func(fh, (struct sockaddr *)&socket_addr.un, sizeof(struct sockaddr_un)) == -1 ) { |
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383 | ROAR_DBG("roar_socket_open(*): Can not connect/bind: %s", strerror(errno)); |
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384 | close(fh); |
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385 | return -1; |
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386 | } |
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387 | } else if ( type == ROAR_SOCKET_TYPE_FORK ) { |
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388 | return roar_socket_open_fork(mode, host, port); |
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389 | } else if ( type == ROAR_SOCKET_TYPE_FILE ) { |
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390 | return roar_socket_open_file(mode, host, port); |
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391 | } else { |
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392 | return -1; |
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393 | } |
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394 | |
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395 | if ( mode == MODE_LISTEN ) |
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396 | if ( listen(fh, ROAR_SOCKET_QUEUE_LEN) == -1 ) { |
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397 | close(fh); |
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398 | return -1; |
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399 | } |
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400 | |
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401 | return fh; |
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402 | } |
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403 | |
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404 | int roar_socket_open_fork (int mode, char * host, int port) { |
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405 | int socks[2]; |
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406 | int r; |
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407 | char fhstr[8]; |
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408 | |
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409 | if ( mode == MODE_LISTEN ) |
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410 | return -1; |
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411 | |
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412 | if ( socketpair(AF_UNIX, SOCK_STREAM, 0, socks) == -1 ) { |
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413 | return -1; |
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414 | } |
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415 | |
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416 | r = fork(); |
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417 | |
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418 | if ( r == -1 ) { // error! |
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419 | ROAR_ERR("roar_socket_open_fork(*): Can not fork: %s", strerror(errno)); |
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420 | close(socks[0]); |
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421 | close(socks[1]); |
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422 | return -1; |
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423 | } else if ( r == 0 ) { // we are the child |
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424 | close(socks[0]); |
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425 | |
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426 | close(ROAR_STDIN ); // we do not want roard to have any standard input |
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427 | close(ROAR_STDOUT); // STDOUT is also not needed, so we close it, |
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428 | // but STDERR we keep open for error messages. |
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429 | |
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430 | snprintf(fhstr, 7, "%i", socks[1]); |
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431 | |
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432 | execlp("roard", "roard", "--terminate", "--no-listen", "--client-fh", fhstr, NULL); |
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433 | |
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434 | // we are still alive? |
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435 | ROAR_ERR("roar_socket_open_fork(*): alive after exec(), that's bad!"); |
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436 | _exit(1); |
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437 | } else { // we are the parent |
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438 | close(socks[1]); |
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439 | return socks[0]; |
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440 | } |
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441 | |
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442 | return -1; |
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443 | } |
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444 | |
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445 | int roar_socket_open_file (int mode, char * host, int port) { |
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446 | int fh; |
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447 | |
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448 | if ( mode == MODE_LISTEN ) |
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449 | return -1; |
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450 | |
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451 | if ( (fh = open(host, O_RDONLY, 0644)) == -1 ) { |
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452 | ROAR_ERR("roar_socket_open_file(*): Can not open file %s: %s", host, strerror(errno)); |
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453 | } |
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454 | |
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455 | return fh; |
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456 | } |
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457 | |
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458 | // --- [ PROXY CODE ] --- |
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459 | |
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460 | // generic proxy code: |
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461 | |
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462 | int roar_socket_open_proxy (int mode, int type, char * host, int port, char * proxy_type) { |
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463 | int proxy_port; |
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464 | char proxy_host[ROAR_SOCKET_MAX_HOSTNAMELEN]; |
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465 | char * proxy_addr; |
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466 | int i; |
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467 | int fh; |
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468 | |
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469 | // TODO: change this so we support listen() proxys (ssh -R) |
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470 | if ( mode != MODE_CONNECT ) |
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471 | return -1; |
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472 | |
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473 | if ( !strcmp(proxy_type, "socks4a") ) { // for TOR, the only supported type at the moment |
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474 | proxy_addr = getenv("socks_proxy"); |
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475 | |
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476 | proxy_port = 9050; // TOR's default port |
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477 | |
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478 | if ( proxy_addr == NULL ) |
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479 | return -1; |
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480 | |
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481 | for (i = 0; proxy_addr[i] != 0 && proxy_addr[i] != ':' && i < ROAR_SOCKET_MAX_HOSTNAMELEN; i++) |
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482 | proxy_host[i] = proxy_addr[i]; |
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483 | proxy_host[i] = 0; |
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484 | |
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485 | if ( i == 0 ) // no hostname found |
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486 | return -1; |
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487 | |
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488 | if ( proxy_addr[i] == ':' ) |
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489 | proxy_port = atoi(&proxy_addr[i+1]); |
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490 | |
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491 | if ( (fh = roar_socket_open(mode, type, proxy_host, proxy_port)) == -1) { |
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492 | return -1; |
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493 | } |
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494 | |
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495 | if ( roar_socket_open_socks4a(mode, fh, host, port) == -1 ) { |
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496 | close(fh); |
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497 | return -1; |
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498 | } |
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499 | |
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500 | return fh; |
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501 | } else { |
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502 | return -1; // unknown type |
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503 | } |
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504 | } |
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505 | |
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506 | // protocoll dependet proxy code: |
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507 | |
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508 | int roar_socket_open_socks4a(int mode, int fh, char * host, int port) { |
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509 | char buf[9]; |
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510 | int len; |
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511 | |
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512 | buf[0] = 0x04; |
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513 | buf[1] = mode == MODE_CONNECT ? 0x01 : 0x02; |
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514 | *((uint16_t*)&buf[2]) = htons(port); |
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515 | buf[4] = 0x00; |
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516 | buf[5] = 0x00; |
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517 | buf[6] = 0x00; |
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518 | buf[7] = 0x01; |
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519 | buf[8] = 0x00; |
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520 | |
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521 | if ( write(fh, buf, 9) != 9 ) |
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522 | return -1; |
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523 | |
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524 | len = strlen(host); |
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525 | |
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526 | if ( write(fh, host, len) != len ) |
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527 | return -1; |
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528 | |
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529 | if ( write(fh, "\0", 1) != 1 ) |
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530 | return -1; |
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531 | |
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532 | if ( read(fh, buf, 8) != 8 ) |
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533 | return -1; |
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534 | |
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535 | if ( buf[1] != 0x5a ) |
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536 | return -1; |
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537 | |
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538 | return 0; |
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539 | } |
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540 | |
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541 | //ll |
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