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 1 |
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6 | #define MODE_CONNECT 2 |
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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 extra_flags = TCP_NODELAY; |
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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 | return fh; |
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15 | } |
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16 | |
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17 | int roar_socket_new_unix (void) { |
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18 | int fh; |
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19 | |
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20 | fh = socket(AF_UNIX, SOCK_STREAM, 0); |
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21 | |
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22 | return fh; |
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23 | } |
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24 | |
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25 | int roar_socket_nonblock(int fh, int state) { |
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26 | int flags; |
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27 | |
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28 | if ( (flags = fcntl(fh, F_GETFL, 0)) == -1 ) { |
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29 | ROAR_ERR("roar_socket_nonblock(fh=%i, state=%i): Can not read flags: %s", fh, state, strerror(errno)); |
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30 | ROAR_DBG("roar_socket_nonblock(fh=%i, state=%i) = -1", fh, state); |
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31 | return -1; |
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32 | } |
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33 | |
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34 | flags |= O_NONBLOCK; |
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35 | |
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36 | if ( state == ROAR_SOCKET_BLOCK ) |
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37 | flags -= O_NONBLOCK; |
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38 | |
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39 | if ( fcntl(fh, F_SETFL, flags) == -1 ) { |
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40 | ROAR_ERR("roar_socket_nonblock(fh=%i, state=%i): Can not set flags: %s", fh, state, strerror(errno)); |
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41 | ROAR_DBG("roar_socket_nonblock(fh=%i, state=%i) = -1", fh, state); |
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42 | return -1; |
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43 | } |
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44 | |
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45 | ROAR_DBG("roar_socket_nonblock(fh=%i, state=%i) = 0", fh, state); |
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46 | return 0; |
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47 | } |
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48 | |
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49 | int roar_socket_listen (int type, char * host, int port) { |
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50 | return roar_socket_open(MODE_LISTEN, type, host, port); |
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51 | } |
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52 | |
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53 | int roar_socket_connect (char * host, int port) { |
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54 | char * proxy_type = getenv("ROAR_PROXY"); |
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55 | |
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56 | if ( proxy_type == NULL || strcmp(proxy_type, "") == 0 ) { |
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57 | return roar_socket_open(MODE_CONNECT, ROAR_SOCKET_TYPE_UNKNOWN, host, port); |
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58 | } else { |
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59 | return roar_socket_open_proxy(MODE_CONNECT, ROAR_SOCKET_TYPE_UNKNOWN, host, port, proxy_type); |
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60 | } |
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61 | } |
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62 | |
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63 | int roar_socket_open (int mode, int type, char * host, int port) { |
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64 | // int type = ROAR_SOCKET_TYPE_INET; |
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65 | int fh; |
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66 | struct sockaddr_in socket_addr; |
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67 | struct sockaddr_un socket_addr_un; |
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68 | struct hostent * he; |
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69 | //unsigned int host_div = 0; |
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70 | int (*mode_func)(int sockfd, const struct sockaddr *serv_addr, socklen_t addrlen) = connect; // default is to connect |
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71 | |
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72 | if ( mode == MODE_LISTEN ) |
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73 | mode_func = bind; |
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74 | |
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75 | if ( type == ROAR_SOCKET_TYPE_UNKNOWN ) { |
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76 | type = ROAR_SOCKET_TYPE_INET; |
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77 | if ( *host == '/' ) { |
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78 | type = ROAR_SOCKET_TYPE_UNIX; |
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79 | } else if ( strcmp(host, "+fork") == 0 ) { |
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80 | type = ROAR_SOCKET_TYPE_FORK; |
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81 | } |
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82 | } |
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83 | |
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84 | |
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85 | ROAR_DBG("roar_socket_open(*): type=%s, host='%s', port=%i", |
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86 | type == ROAR_SOCKET_TYPE_UNIX ? "UNIX" : "INET", host, port); |
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87 | |
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88 | memset(&socket_addr , 0, sizeof(socket_addr)); |
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89 | memset(&socket_addr_un, 0, sizeof(socket_addr_un)); |
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90 | memset(&he, 0, sizeof(he)); // FIXME: we have a valid pointer in here???? |
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91 | |
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92 | |
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93 | if ( type == ROAR_SOCKET_TYPE_INET ) { |
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94 | |
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95 | if ( (he = gethostbyname(host)) == NULL ) { |
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96 | ROAR_ERR("roar_socket_open(*): Can\'t resolve host name '%s'", |
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97 | host); |
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98 | return -1; |
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99 | } |
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100 | |
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101 | memcpy((struct in_addr *)&socket_addr.sin_addr, he->h_addr, sizeof(struct in_addr)); |
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102 | |
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103 | /* set the connect information */ |
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104 | socket_addr.sin_family = AF_INET; |
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105 | socket_addr.sin_port = htons( port ); |
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106 | |
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107 | fh = roar_socket_new_tcp(); |
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108 | |
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109 | if ( mode_func(fh, (struct sockaddr *)&socket_addr, sizeof(struct sockaddr_in)) == -1 ) { |
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110 | ROAR_DBG("roar_socket_open(*): Can not connect/bind: %s", strerror(errno)); |
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111 | close(fh); |
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112 | return -1; |
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113 | } |
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114 | // hey! we have a socket... |
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115 | } else if ( type == ROAR_SOCKET_TYPE_UNIX ) { |
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116 | socket_addr_un.sun_family = AF_UNIX; |
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117 | strncpy(socket_addr_un.sun_path, host, sizeof(socket_addr_un.sun_path) - 1); |
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118 | |
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119 | fh = roar_socket_new_unix(); |
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120 | |
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121 | if ( mode_func(fh, (struct sockaddr *)&socket_addr_un, sizeof(struct sockaddr_un)) == -1 ) { |
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122 | ROAR_DBG("roar_socket_open(*): Can not connect/bind: %s", strerror(errno)); |
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123 | close(fh); |
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124 | return -1; |
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125 | } |
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126 | } else if ( type == ROAR_SOCKET_TYPE_FORK ) { |
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127 | return roar_socket_open_fork(mode, host, port); |
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128 | } else if ( type == ROAR_SOCKET_TYPE_FILE ) { |
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129 | return roar_socket_open_file(mode, host, port); |
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130 | } else { |
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131 | return -1; |
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132 | } |
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133 | |
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134 | if ( mode == MODE_LISTEN ) |
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135 | if ( listen(fh, ROAR_SOCKET_QUEUE_LEN) == -1 ) { |
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136 | close(fh); |
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137 | return -1; |
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138 | } |
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139 | |
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140 | return fh; |
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141 | } |
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142 | |
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143 | int roar_socket_open_fork (int mode, char * host, int port) { |
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144 | int socks[2]; |
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145 | int r; |
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146 | char fhstr[8]; |
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147 | |
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148 | if ( mode == MODE_LISTEN ) |
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149 | return -1; |
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150 | |
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151 | if ( socketpair(AF_UNIX, SOCK_STREAM, 0, socks) == -1 ) { |
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152 | return -1; |
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153 | } |
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154 | |
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155 | r = fork(); |
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156 | |
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157 | if ( r == -1 ) { // error! |
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158 | ROAR_ERR("roar_socket_open_fork(*): Can not fork: %s", strerror(errno)); |
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159 | close(socks[0]); |
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160 | close(socks[1]); |
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161 | return -1; |
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162 | } else if ( r == 0 ) { // we are the child |
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163 | close(socks[0]); |
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164 | |
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165 | close(ROAR_STDIN ); // we do not want roard to have any standard input |
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166 | close(ROAR_STDOUT); // STDOUT is also not needed, so we close it, |
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167 | // but STDERR we keep open for error messages. |
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168 | |
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169 | snprintf(fhstr, 7, "%i", socks[1]); |
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170 | |
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171 | execlp("roard", "roard", "--terminate", "--no-listen", "--client-fh", fhstr, NULL); |
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172 | |
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173 | // we are still alive? |
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174 | ROAR_ERR("roar_socket_open_fork(*): alive after exec(), that's bad!"); |
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175 | _exit(1); |
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176 | } else { // we are the parent |
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177 | close(socks[1]); |
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178 | return socks[0]; |
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179 | } |
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180 | |
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181 | return -1; |
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182 | } |
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183 | |
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184 | int roar_socket_open_file (int mode, char * host, int port) { |
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185 | int fh; |
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186 | |
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187 | if ( mode == MODE_LISTEN ) |
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188 | return -1; |
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189 | |
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190 | if ( (fh = open(host, O_RDONLY, 0644)) == -1 ) { |
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191 | ROAR_ERR("roar_socket_open_file(*): Can not open file %s: %s", host, strerror(errno)); |
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192 | } |
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193 | |
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194 | return fh; |
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195 | } |
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196 | |
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197 | // --- [ PROXY CODE ] --- |
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198 | |
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199 | // generic proxy code: |
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200 | |
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201 | int roar_socket_open_proxy (int mode, int type, char * host, int port, char * proxy_type) { |
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202 | int proxy_port; |
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203 | char proxy_host[ROAR_SOCKET_MAX_HOSTNAMELEN]; |
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204 | char * proxy_addr; |
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205 | int i; |
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206 | int fh; |
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207 | |
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208 | // TODO: change this so we support listen() proxys (ssh -R) |
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209 | if ( mode != MODE_CONNECT ) |
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210 | return -1; |
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211 | |
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212 | if ( !strcmp(proxy_type, "socks4a") ) { // for TOR, the only supported type at the moment |
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213 | proxy_addr = getenv("socks_proxy"); |
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214 | |
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215 | proxy_port = 9050; // TOR's default port |
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216 | |
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217 | if ( proxy_addr == NULL ) |
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218 | return -1; |
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219 | |
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220 | for (i = 0; proxy_addr[i] != 0 && proxy_addr[i] != ':' && i < ROAR_SOCKET_MAX_HOSTNAMELEN; i++) |
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221 | proxy_host[i] = proxy_addr[i]; |
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222 | proxy_host[i] = 0; |
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223 | |
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224 | if ( i == 0 ) // no hostname found |
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225 | return -1; |
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226 | |
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227 | if ( proxy_addr[i] == ':' ) |
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228 | proxy_port = atoi(&proxy_addr[i+1]); |
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229 | |
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230 | if ( (fh = roar_socket_open(mode, type, proxy_host, proxy_port)) == -1) { |
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231 | return -1; |
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232 | } |
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233 | |
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234 | if ( roar_socket_open_socks4a(mode, fh, host, port) == -1 ) { |
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235 | close(fh); |
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236 | return -1; |
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237 | } |
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238 | |
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239 | return fh; |
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240 | } else { |
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241 | return -1; // unknown type |
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242 | } |
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243 | } |
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244 | |
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245 | // protocoll dependet proxy code: |
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246 | |
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247 | int roar_socket_open_socks4a(int mode, int fh, char * host, int port) { |
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248 | char buf[9]; |
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249 | int len; |
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250 | |
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251 | buf[0] = 0x04; |
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252 | buf[1] = mode == MODE_CONNECT ? 0x01 : 0x02; |
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253 | *((uint16_t*)&buf[2]) = htons(port); |
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254 | buf[4] = 0x00; |
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255 | buf[5] = 0x00; |
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256 | buf[6] = 0x00; |
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257 | buf[7] = 0x01; |
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258 | buf[8] = 0x00; |
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259 | |
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260 | if ( write(fh, buf, 9) != 9 ) |
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261 | return -1; |
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262 | |
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263 | len = strlen(host); |
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264 | |
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265 | if ( write(fh, host, len) != len ) |
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266 | return -1; |
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267 | |
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268 | if ( write(fh, "\0", 1) != 1 ) |
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269 | return -1; |
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270 | |
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271 | if ( read(fh, buf, 8) != 8 ) |
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272 | return -1; |
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273 | |
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274 | if ( buf[1] != 0x5a ) |
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275 | return -1; |
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276 | |
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277 | return 0; |
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278 | } |
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279 | |
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280 | //ll |
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